COMPACT RETRIEVABLE HORIZONTAL MODULAR CONNECTORIZED DISTRIBUTION UNIT AND MOUNTING BASE FRAME FOR SUBSEA APPLICATIONS
The present invention relates generally to a modular locking and retaining mechanical design solution to reliably secure immersed, unrestrained and un-powered objects in a fluid environment to a fixed support surface such as a mounting frame or panel, with a quick connect/disconnect engagement method by a diver (i.e. manual mate) or remote-operated vehicles (ROVs) mate, into a fixed mounting frame or panel installed at a subsea deployed platform for oil and gas offshore applications. The invention relates particularly to providing an isolation guide or means to prevent dissimilar materials, metals, of a compact retrievable, horizontal or vertical MCDU configuration and a frame from coming into direct contact to avoid corrosive effects, such as galvanic corrosion.
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The present application claims benefit of priority to and is a continuation-in-part of U.S. patent application Ser. No. 14/582,165, filed Dec. 23, 2014, and entitled MODULAR SECURING DEVICE FOR ROV AND DIVER MATE-ABLE SUBSEA APPLICATIONS (Gonzalez) which is hereby incorporated herein by reference in the entirety.
FIELD OF THE INVENTIONThe present invention relates generally to a modular locking and retaining mechanical design solution to reliably secure immersed, unrestrained and un-powered objects in a fluid environment to a fixed support surface such as a mounting frame or panel, with a quick connect/disconnect engagement method by a diver (i.e. manual mate) or remote-operated vehicles (ROVs) mate, into a fixed mounting frame or panel installed at a subsea deployed platform for oil and gas offshore applications. The invention provides modular, compact and flexible retrievable distribution assembly via ROV or diver operations on manifolds, trees and subsea structures.
BACKGROUND OF THE INVENTIONIn offshore drilling and production operations, equipment are often subjected to harsh conditions thousands of feet under the sea surface with working temperatures of −50° F. to 350° F. with pressures of up to 15,000 psi. Subsea control and monitoring equipment commonly are used in connection with operations concerning the flow of fluid, typically oil or gas, out of a well. Flow lines are connected between subsea wells and production facilities, such as a floating platform or a storage ship or barge. Subsea equipment include sensors and monitoring devices (such as pressure, temperature, corrosion, erosion, sand detection, flow rate, flow composition, valve and choke position feedback), and additional connection points for devices such as down hole pressure and temperature transducers. A typical control system monitors, measures, and responds based on sensor inputs and outputs control signals to control subsea devices. For example, a control system attached to a subsea tree controls down-hole safety valves. Functional and operational requirements of subsea equipment have become increasingly complex along with the sensing and monitoring equipment and control systems used to insure proper operation.
To connect the numerous and various sensing, monitoring and control equipment necessary to operate subsea equipment, harsh-environment connectors are used with electrical cables, optical fiber cables, or hybrid electro-optical cables. Initial demand for subsea connector development was in connection with military applications. Over time demand for such connectors has grown in connection with offshore oil industry applications.
Early underwater connectors were electrical “dry-mate” devices, intended to be mated prior to immersion in the sea and were of two principal types: rubber-molded “interference fit” type and rigid-shell connectors. The rubber molded “interference-fit” connectors depended on receptacles with elastic bores that stretched and sealed over mating plugs. The rigid-shell connectors had mating parts sealed together via O-rings or other annular seals.
Ocean Design, Inc. has been an industry leader in the development of subsea connectors and applications. Dr. James Cairns' article Hybrid Wet-Mate Connectors: ‘Writing the Next Chapter’, Sea Technology, published July 1997, provides a thorough discussion of the history of underwater connectors through to 1997, and is a source for this background summary. In the early 1960s, electrical connectors intended for mating and de-mating underwater came into use. These so called “wet-mate” connectors were adaptations of the interference-fit dry-mate versions, and were designed so that when mated, the water contained in the receptacle bores would be substantially expelled prior to sealing. Also during this time, the first oil-filled and pressure-balanced electrical connector designs were introduced. These isolated the receptacle contacts within sealed oil-chambers which, during engagement, were penetrated by elongated pins with insulated shafts. Connection was, therefore, accomplished in the benign oil, not in harsh seawater. Unlike previous connector types which could not be disengaged at even modest depths, pressure balancing type connectors could be actuated anywhere in the sea. These wet-mate oil-filled connectors eventually became the high-reliability standard for the offshore oil industry. One critical design element of oil-filled connectors is providing seals that allow the oil chambers to be penetrated repeatedly without losing the oil or allowing seawater intrusion. One design widely used for electrical applications accomplishes this through the use of dielectric pistons, one of which resides in each receptacle socket. Each piston has a spring which biases it outward to automatically fill the socket's end-seal when the plug pin is withdrawn. During mating the pins push these pistons back through the oil-chamber ports (which they have kept sealed) and onward deep inside the sockets.
Early subsea wet-mate optical connectors passed only one optical circuit and used expanded-beam lenses or fiber-to-fiber physical contact junctions. To protect the optical interfaces, both the plug and receptacle contacts were housed in oil-filled chambers which were pressure balanced to the environment. Problems with this design included that sealing and cleanliness were not adequate to provide desired reliability. The spring/piston concept used for sealing electrical connectors is not effective for optical connectors as pistons get in the way of the light path. A second type of subsea-mateable optical connector consisted basically of dry-mate connectors which had a bit of optical index-matching gel placed in the contact interfaces. The excess gel was expelled upon mating. There was no attempt to exclude sand or silt from the interfaces, and the resulting performance was left to chance. Hybrid wet-mate devices were an attempt to combine oil-filled and pressure-balanced plug and receptacle housings with means for sealing and maintaining cleanliness of the optical interfaces. Within both, plug and receptacle, oil chambers, groups of contact junctions are aligned behind cylindrical rubber face-seals. When mated, opposed plug and receptacle seals first press against each other like the wringers of an old-fashioned washing machine, forcing the water out from between them. As the mating sequence continues the opposed plug and receptacle seals, like the wringers, roll in unison and transport any debris trapped between them off to the side. The action simultaneously causes clean, sealed, oil-filled passages to open between opposed plug and receptacle contact junctions. Continuing the mating process, plug pins advance through the sealed passages to contact sockets within the receptacle. De-mating is the reverse sequence. In the case of electrical circuits each mated pin/socket junction is contained in an individual, secondary, sealed oil chamber within the common oil volume. The contacts are unexposed to environmental conditions before, during and after mating.
There are many types of connectors for making electrical and fiber-optic cable connections in hostile or harsh environments, such as undersea or submersible connectors which can be repeatedly mated and de-mated underwater at great ocean depths. Current underwater connectors typically comprise releasably mateable plug and receptacle units, each containing one or more electrical or optical contacts or junctions for engagement with the junctions in the other unit when the two units are mated together. Each of the plug and receptacle units or connector parts is attached to cables or other devices intended to be joined by the connectors to form completed circuits. To completely isolate the contacts to be joined from the ambient environment, one or both halves of these connectors house the contacts in oil-filled, pressure-balanced chambers—this is referred to as a pressure balanced set-up. Such devices are often referred to as “wet-mate” devices and often are at such great depths that temperature and other environmental factors present extreme conditions for materials used in such devices. The contacts on one side (plug) are in the form of pins or probes, while the contacts or junctions on the other side (receptacle) are in the form of sockets for receiving the probes.
Typically, the socket contacts are contained in a sealed chamber containing a dielectric fluid or other mobile substance, and the probes enter the chamber via one or more sealed openings. Such wet-mate devices have previously been pressure compensated. One major problem in designing such pressure compensated or pressure balanced units is the performance and longevity of seals required to exclude seawater and/or contaminates from the contact chamber after repeated mating and de-mating.
Both the plug and receptacle halves of most fiber-optical connectors which are mateable in a harsh environment have oil-filled chambers. The chambers are typically brought face-to-face during an early step of the mating sequence. In a subsequent mating step, one or more connective passages, sealed from the outside environment, are created between the chambers of the mating connector halves. The passages join the two oil-filled chambers, creating a single, connected oil volume. Actual connection of the contact junctions then takes place within the common oil chamber. Examples of prior pressure compensated wet-mate devices are described in U.S. Pat. Nos. 4,616,900; 4,682,848; 5,838,857; 6,315,461; 6,736,545; and 7,695,301.
In some known underwater electrical connectors, such as that described in U.S. Pat. Nos. 4,795,359 and 5,194,012 of Cairns, tubular socket contacts are provided in the receptacle unit, and spring-biased pistons are urged into sealing engagement with the open ends of the socket assemblies. As the plug and receptacle units are mated, pins on the plug portion urge the pistons back past the contact bands in the sockets, so that electrical contact is made. However, this type of arrangement cannot be used in a straightforward way for an optical connector since the optical contacts must be able to engage axially for practical purposes.
U.S. Pat. No. 4,666,242 of Cairns describes an underwater electro-optical connector in which the male and female connector units are both oil filled and pressure balanced. This device utilizes a penetrable seal element having an opening which pinches closed when the units are separated and seals against the entering probe when mated. Other known fiber-optic connectors have similar seals which are not suitable for use under some conditions and may tend to lose effectiveness after repeated mating and de-mating.
Other known seal mechanisms involve some type of rotating seal element along with an actuator for rotating the seal element between a closed, sealed position when the units are unmated, and an open position when the units are mated, allowing the contact probes to pass through the seal elements into the contact chambers. Such connectors are described, for example, in U.S. Pat. Nos. 5,685,727 and 5,738,535 of Cairns. These overcome some of the reliability problems of penetrable seals, for example, but can be too complex for miniaturized connectors.
Most existing wet-mate connectors of the pressure compensation-type depend on elastomers, which have several known disadvantages and which only grow as required temperature and pressure performance in the operating environments increase. Above 350° F. in particular, but at lower temperatures as well, elastomers in seawater degrade rapidly, and can fail due to numerous causes, including: rupture; rapid gas decompression (RGD) embolisms; leakage; melting; and gas permeation. Materials science has advanced to create new materials capable of functioning and lasting in harsher environments, but the industry is moving towards temperature regimes at or in excess of 400° F., where even the newest materials will be stressed to or beyond their limits.
Other pressure compensation systems typically rely on metal bellows, which have different weaknesses. At the scale of ever-smaller optical feedthrough systems, where diameters of compensation systems are typically less than an inch, the metal of the bellows are extraordinarily thin, and the welded joints may be subject to fatigue, opening up failure pathways similar to those of elastomers. One primary concern with deployable embodiments of wet-mate devices regarding pressure compensation is the use of elastomeric hoses. Operators experience signal loss on gas and gas-lift wells during start up and shutdown. At these events the gas functions in the well are dynamic and not at equilibrium. In addition, pressure compensated systems in gaseous environments have experienced complete loss of pressure compensation and infiltration of seawater into spaces that should be dielectrically insulated by oil.
Thus, common underwater connectors comprise releasably, mateable plug and receptacle units, each containing one or more electrical or optical contacts or junctions for engagement with the junctions in the other unit when the two units are mated together. The contacts on one side are in the form of pins or probes, while the contacts or junctions on the other side are in the form of sockets for receiving the probes. Typically, the socket contacts are contained in a sealed chamber containing a dielectric fluid or other mobile substance, and the probes enter the chamber via one or more sealed openings. One major problem in designing such units is the provision of seals which will adequately exclude or evacuate seawater and/or contaminants from the contact chamber after repeated mating and de-mating operations.
There are many types of housings and frames for mounting or securing modular connectorized distribution units (MCDUs) in a fluid environment. These housings secure the MCDUs which are subsea distribution units which may provide oil-filled, pressure-balanced, connectorized junctions for flexible underwater mating for a variety of wet mate connectors. An MCDU functions as the hub of an expandable subsea network. The MCDUs may be used to join multiple circuits of optical, electrical, or hybrid connection type configurations. The MCDU is designed to interface with a variety of subsea structures.
MCDUs are typically installed on a housing or landing frame on the surface prior to being secured in a sub-sea environment. MCDU landing frames are typically installed on concrete slabs or attached to larger sub-sea structures. These MCDUs and MCDU landing frames may have originally been designed and intended to withstand 20-25 years in a corrosive, turbid environment. However, in normal applications, MCDUs may need to be removed for refurbishment or repair after only 5-8 years as a result of factors including galvanic corrosion.
Furthermore, MCDUs and other sub-sea devices may need to be moved from their original location or removed entirely due to factors other than equipment failure. For example, a planned oil well may not be economically feasible due to the oil reserve not being as large as originally surveyed. Also, in the field of sub-sea mining, equipment may need to be moved or replaced more frequently as a seam of minerals or ore is surveyed and mined. Sub-sea mining equipment also may require more power than sub-sea oil drilling equipment and may therefore put additional strain on equipment such as MCDUs, requiring more frequent refurbishment or repair.
Typically, when an MCDU needs to be replaced or removed, removal is difficult because of the buildup of silt and other particulates and because of galvanic corrosion. These and other factors may make it hard if not impossible to remove an MCDU from its landing frame, resulting in the inability to remove, reuse, or refurbish either the frame or the MCDU. Refurbishing an MCDU is economically desirable over replacing and MCDU due to the very high equipment cost per MCDU housing. Removing and refurbishing an MCDU also eliminates the need to install a new landing frame or remove existing fixed landing frames that may not be able to be separated from an MCDU using existing securing methods.
Additionally, when connecting various wet-mate type connectors to or from an MCDU, problems exist in securing connectors, cables, remote operate vehicles (ROVs), and other materials. Currently there exists no method for securing immersed, un-restrained objects in seawater or freshwater with vertical stability and a positive meta-centric height to a fixed structure, neutralizing the buoyancy force effect.
What is needed is a system for the maintaining of a secured, consistent, stably removable MCDU housing position into a landing base frame to facilitate a reliable mating/de-mating alignment capability with connector harnesses by manual (i.e., diver) mating or by a remote-operated vehicle (ROV) mating methods.
What is further needed is an MCDU securing device that provides isolation of the MCDU from the frame to prevent unwanted corrosion, such as due to galvanic corrosion resulting from dissimilar metals coming into direct contact with one another. Avoiding in whole or in part corrosion leads to less replacement costs, less downtime due to in operative equipment as a result of corrosion degradation and other benefits. In addition what is needed is a securing device that addresses undesired buoyancy effects with an MCDU placed in subsea locations.
SUMMARY OF THE INVENTIONEmbodiments described herein provide a new modular securing device for ROV and diver mate-able subsea applications.
The present invention comprises a modular and versatile mechanical design that provides a quick, reliable and low-cost solution to secure immersed, un-restrained objects in seawater or freshwater with vertical stability and a positive meta-centric height to a fixed structure, neutralizing the buoyancy force effect. The present invention also reduces the risk of mating and/or de-mating connectors and reduces the probability of misalignments which may result in unreliable and costly failures for the subsea applications.
The present invention provides a T-handle locking key and T-handle ACME threaded shaft/stud assembly for securing an MCDU and removable parking plate to an MCDU landing unit. Use of the quick disconnect T-handle locking key and threaded T-handle body and stud assemblies for attaching an MCDU to an MCDU landing frame provides the benefit of easy and quick removal or replacement of an MCDU or parking plate. The modular securing devices may be operated either manually by a diver or remotely by an ROV. The modular securing devices according to the present invention may also be used in other configurations and with other frames, structures, or devices as a method of securing one apparatus to another in a sub-sea environment.
In a further embodiment, the invention provides a horizontal modular and compact retaining design solution for reliably install and secure immersed unrestrained and unpowered objects in a fluid, such as a retrievable MCDU into a horizontal or vertical mounting base frame system. Operation of the device allows for a flexible quick connect/disconnect from a horizontal or vertical mounting welded structural frame with isolation plastic guides via diver or ROV, and without the help of buoyancy or a lifting wire. The isolation plastic guides panels are attached on the inside of the two each hollow side of the mounting base frame welded structure for preventing dissimilar metals to be in direct contact. The components to be made in similar and compatible materials for marine and subsea applications.
This further embodiment provides a reliable and secure retaining capability to neutralize the buoyancy force effect from the Archimedes principal of buoyancy of immersed objects in a fluid. The design also utilizes the material compatibility to avoid the galvanic corrosion effect from dissimilar metals in contact and immersed in an electrolytic solution such as seawater.
This further embodiment modular and versatile system design provides a compact quick, reliable and low cost solution to secure immersed unrestrained objects in seawater or fresh water with horizontal stability and a positive metacentric height to a fixed structure, neutralizing the buoyancy force effect. The invention in this embodiment allows for a secured consistent and stable retention of a removable assembly into a horizontal or vertical fixed landing mounting base frame. it facilitates a reusable mating-demating combined with alignment capabilities via manual (diver) or ROV mate methods. The invention also eliminates the risk of mating-demating connectors misalignment for both horizontal and vertical configuration, which can result in a low reliable and costly failure for subsea applications.
In one embodiment, the present invention comprises a modular securing device comprising: a frame having a mounting surface for mounting the securing device to an intended object; a frame guide fixed to the frame and having a generally open end configured to receive a retrievable MCDU and being configured to secure a received MCDU in a locked position within the frame, the frame having a substantially open front to allow access to input(s)/output(s) on the front face of the MCDU when in a locked position; an isolation guide received within and affixed to the frame guide and adapted to allow an MCDU to be received within the frame guide, the isolation guide being disposed intermediate the frame guide and the MCDU to substantially isolate the surface of the MCDU from direct contact with the surface of the frame guide and the frame; and a locking key assembly configured to be received by the frame guide and to be removably locked in place on the frame guide so as to prevent the MCDU from inadvertently becoming displaced from the frame when in the locked position.
The above embodiment may further comprise one or more of: wherein said locking key assembly a locking key comprising: an elongated body having a front end, a back end, and an exterior surface; a t-shaped handle attached to said back end; a raised protrusion extending vertically from said exterior surface at said front end; a spring assembly comprising a tension spring disposed on the elongated body intermediate an inner plate and an outer plate, and said spring surrounding said elongated body between said inner plate and said outer plate; and a set of bushings having a front face and a back face, and a central bore, said back face attached to said frame, said set of bushings adapted to receive said front end of said elongated body and having a guide channel adapted to guide said raised protrusion of said locking key when receiving said front end of said elongated body, and a recess formed therein for receiving the raised protrusion; whereby with said locking key introduced into said frame said t-shaped handle is adapted to be pushed forward to compress said tension spring between said inner and outer plates and to cause the raised protrusion to extend outward from the guide channel, said locking key adapted to rotate to lock in a fixed position with said raised protrusion engaging the recess, thereby securing a modular connection unit received in the frame central hollow area in place. The invention may further comprise: wherein said frame guide comprises oppositely facing left and right frame guide components and are generally C-shaped in cross-section, said isolation guide comprising left and right isolation guide components generally C-shaped in cross-section and configured to be received, respectively, within said left and right frame guide components; wherein said isolation guide includes a stop adapted to prevent the MCDU from moving beyond a desired point along the frame guide and from coming into direct contact with the frame; wherein the MCDU is received via a top open end of the frame guide and the frame includes a base extending outward away from the mounting surface, and further comprising a stop adapted to prevent the MCDU from moving beyond a desired point along the frame guide and from coming into direct contact with the frame; wherein the frame guide and the isolation guide include locking key receiving means for receiving a locking key component of the locking key assembly and with the locking key component in place within the frame guide the locking key component engaging with a surface of the MCDU to hold the MCDU in place within the frame; wherein said isolation guide is comprised of an isolation material resistant to galvanic corrosion; wherein said locking key assembly is comprised of a material resistant to galvanic corrosion; wherein the intended object to which the securing device and said frame and MCDU are to be mounted is located in a deep sea environment.
In another embodiment, the present invention may comprise a subsea electrical and/or fiber optic interconnect assembly for offshore applications, including oil and gas, defense, oceanographic, and telecommunications applications, the system comprising: an MCDU; a modular securing device adapted to removably receive and secure the MCDU in remote subsea locations and comprising: a frame having a mounting surface for mounting the securing device to an intended object; a frame guide fixed to the frame and having a generally open end configured to receive an MCDU and being configured to secure a received MCDU in a locked position within the frame, the frame having a substantially open front to allow access to input(s)/output(s) on the front face of the MCDU when in a locked position; an isolation guide received within and affixed to the frame guide and adapted to allow an MCDU to be received within the frame guide, the isolation guide being disposed intermediate the frame guide and the MCDU to substantially isolate the surface of the MCDU from direct contact with the surface of the frame guide and the frame; and a locking key assembly configured to be received by the frame guide and to be removably locked in place on the frame guide so as to prevent the MCDU from inadvertently becoming displaced from the frame when in the locked position.
In order to facilitate a complete understanding of the present invention, this system, and the terms used, reference is now made to the accompanying drawings, in which like elements are referenced with like numerals. These drawings should not be construed as limiting the present invention or system, but are exemplary and for reference.
The present invention and system will now be described in more detail with reference to exemplary embodiments as shown in the accompanying drawings. While the present invention and system is described herein with reference to the exemplary embodiments, it should be understood that the present invention and system is not limited to such exemplary embodiments. Those possessing ordinary skill in the art and having access to the teachings herein will recognize additional implementations, modifications, and embodiments as well as other applications for use of the invention and system, which are fully contemplated herein as within the scope of the present invention and system as disclosed and claimed herein, and with respect to which the present invention and system could be of significant utility.
Certain embodiments as disclosed herein provide for a modular securing device for ROV and diver mate-able subsea applications in which a single T-handle locking key is attached to the upper portion of an MCDU landing frame and a pair of ACME threaded T-handle shaft/stud assemblies are attached to protrusions on the side of the MCDU landing frame. In one embodiment, the upper and a lower ACME threaded T-handle shaft/stud assemblies are attached to respective upper and lower protrusions on the MCDU frame.
The drawings illustrate exemplary embodiments of methods and apparatuses for securing items, connections, frames, or assemblies to an MCDU landing frame in a turbid fluid environment, using a combination of T-handle locking keys and ACME threaded T-handle shaft/stud assemblies.
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With T-handle locking key 200 in place, the first fixed holding bushing 220 and second fixed holding bushing 221 are mounted on opposite lateral sides of the MCDU landing base/frame 150. Each of the fixed holding bushings 220 and 221 may comprise a quick-alignment slot 222B and 222A, respectively, at the top of the bushing and a pair of locking indentations 224 oriented along the horizontal axis of the bushing. The quick-alignment slots 222A and 222B guide the quick-alignment keyed pin 214 of the T-handle locking key 200 through the each of the bushings 220 and 221. After being inserted through both bushings 220 and 221 and clearing the exterior surface of fixed holding bushing 220, the T-handle locking key 200 and quick-alignment keyed pin 214 may be rotated ninety degrees clockwise or counter-clockwise to lock the quick-alignment keyed pin 214 into either of the locking indentations 224.
The quick-alignment keyed pin 214 is held into a locking indentation 224 by a compression spring force exerted by the tension spring 230. The tension spring 230 exerts a spring force along the length of the T-handle locking key 200 by pressing on both of the outer spring plate 232 and inner spring plate 234. The outer spring plate 232 and inner spring plate 234 keep the tension spring 230 in position and when the T-handle locking key 200 is inserted fully through both of the fixed holding bushings 220 and 221 the exterior of the second fixed holding bushing 221 facing the inner spring plate 234 contacts the inner spring plate 234 and moves the plate 234 along the axis of the T-handle shaft 210 towards the T-handle 212. This movement compresses the tension spring 230 which causes a low torque spring force to hold the quick-alignment keyed pin 214 in place in the locking indention 224 of the fixed holding bushing 220.
The compression spring force principle is used in combination with a low torque and a mechanically keyed drive alignment design fixture to assure a quick connect/disconnect. This design provides a reliable and secure locking capability to neutralize the buoyancy effect from the Archimedes principle of buoyancy of objects immersed in a fluid. The design also utilizes the material compatibility to avoid galvanic corrosion effect from dissimilar materials in contact with each other, and immersed in an electrolytic solution such as seawater. All components of the T-handle locking key 200 and ACME threaded T-handle shaft/stud assembly 300 may be made in similar fashion and from compatible materials which include 316 and 316L SST, and a bronze (anti-friction material) for marine and subsea applications.
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When removed from the MCDU frame 1902, the T-handle locking key 1908/1910 may be placed in the docking receiver 1920 so that an ROV may easily manipulate the MCDU handle 1952 to remove or place the MCDU 1950 from or into frame 1902 along frame guides 1904/1906. After the MCDU 1950 is removed, or after a new MCDU is inserted, each T-handle locking key 1908/1910 may be removed from the docking receiver 1920 and disposed back into the MCDU landing assembly 1902 via the openings formed in the frame guides 1904/1906 and via fixed bushings 1913/1914.
An important feature of the embodiment of
Problems may arise in deep sea and harsh environments in which dissimilar materials, such as metals, come in contact and this may be further exacerbated by agitation. Rubbing or active engagement of dissimilar metals coming into contact in such environments can cause one or both of the components to experience corrosion, including galvanic corrosion, and/or a greater rated of corrosion and fatigue. The buoyancy force effect or buoyancy represents the upward force exerted by a fluid, such as seawater, in opposition to the weight of an immersed object. An object having a density greater than that of the fluid in which it is submerged tends to sink. If the object is less dense than the liquid the force tends to keep the object afloat. Since both the MCDU 1950 and the Frame 1902 are submersed in seawater for their intended use in deep sea applications, buoyancy is a design and operational concern that presents a unique challenge. Pressure is an additional factor as it increases as the depth of an object immersed increases. As is well known, the pressure at the bottom of a body of fluid is greater than the pressure near the surface of a body of fluid. As the object's depth increases, so the fluid pressure increases. Similarly, the pressure at the bottom of a submerged object is greater than the pressure at the top of the submerged object. Accordingly, the differences in object weights, configurations and the related pressures experienced by them in a submerged state may cause additional forces to add to the corrosive effect of the dissimilar materials, such as the MCDU 1950 and the frame 1902.
To solve the problem of the corrosive effect of dissimilar materials, metals, and the buoyancy effect, the present invention in the embodiment of
In addition, the isolation guides 1930 are configured to separate the bottom of the MCDU 1950 from coming into contact with the floor or base 1907 of frame 1902. In the exemplary configuration as shown in
While the invention has been described by reference to certain preferred embodiments, it should be understood that numerous changes could be made within the spirit and scope of the inventive concept described. Also, the present invention is not to be limited in scope by the specific embodiments described herein. It is fully contemplated that other various embodiments of and modifications to the present invention, in addition to those described herein, will become apparent to those of ordinary skill in the art from the foregoing description and accompanying drawings. Thus, such other embodiments and modifications are intended to fall within the scope of the following appended claims. Further, although the present invention has been described herein in the context of particular embodiments and implementations and applications and in particular environments, those of ordinary skill in the art will appreciate that its usefulness is not limited thereto and that the present invention can be beneficially applied in any number of ways and environments for any number of purposes. Accordingly, the claims set forth below should be construed in view of the full breadth and spirit of the present invention as disclosed herein.
Claims
1. A modular securing device comprising:
- a frame having a mounting surface for mounting the securing device to an intended object;
- a frame guide fixed to the frame and having a generally open end configured to receive an MCDU and being configured to secure a received MCDU in a locked position within the frame, the frame having a substantially open front to allow access to input(s)/output(s) on the front face of the MCDU when in a locked position;
- an isolation guide received within and affixed to the frame guide and adapted to allow an MCDU to be received within the frame guide, the isolation guide being disposed intermediate the frame guide and the MCDU to substantially isolate the surface of the MCDU from direct contact with the surface of the frame guide and the frame; and
- a locking key assembly configured to be received by the frame guide and to be removably locked in place on the frame guide so as to prevent the MCDU from inadvertently becoming displaced from the frame when in the locked position.
2. The modular securing device of claim 1, wherein said locking key assembly
- a locking key comprising: an elongated body having a front end, a back end, and an exterior surface; a t-shaped handle attached to said back end; a raised protrusion extending vertically from said exterior surface at said front end;
- a spring assembly comprising a tension spring disposed on the elongated body intermediate an inner plate and an outer plate, and said spring surrounding said elongated body between said inner plate and said outer plate; and
- a set of bushings having a front face and a back face, and a central bore, said back face attached to said frame, said set of bushings adapted to receive said front end of said elongated body and having a guide channel adapted to guide said raised protrusion of said locking key when receiving said front end of said elongated body, and a recess formed therein for receiving the raised protrusion;
- whereby with said locking key introduced into said frame said t-shaped handle is adapted to be pushed forward to compress said tension spring between said inner and outer plates and to cause the raised protrusion to extend outward from the guide channel, said locking key adapted to rotate to lock in a fixed position with said raised protrusion engaging the recess, thereby securing a modular connection unit received in the frame central hollow area in place.
3. The modular securing device of claim 1, wherein said frame guide comprises oppositely facing left and right frame guide components and are generally C-shaped in cross-section, said isolation guide comprising left and right isolation guide components generally C-shaped in cross-section and configured to be received, respectively, within said left and right frame guide components.
4. The modular securing device of claim 1, wherein said isolation guide includes a stop adapted to prevent the MCDU from moving beyond a desired point along the frame guide and from coming into direct contact with the frame.
5. The modular securing device of claim 1, wherein the MCDU is received via a top open end of the frame guide and the frame includes a base extending outward away from the mounting surface, and further comprising a stop adapted to prevent the MCDU from moving beyond a desired point along the frame guide and from coming into direct contact with the frame.
6. The modular securing device of claim 1, wherein the frame guide and the isolation guide include locking key receiving means for receiving a locking key component of the locking key assembly and with the locking key component in place within the frame guide the locking key component engaging with a surface of the MCDU to hold the MCDU in place within the frame.
7. The modular securing device of claim 1, wherein said isolation guide is comprised of a material resistant to galvanic corrosion.
8. The modular securing device of claim 1, wherein said locking key assembly is comprised of a material resistant to galvanic corrosion.
9. The modular securing device of claim 1, wherein the intended object to which the securing device and said frame and MCDU are to be mounted is located in a deep sea environment.
10. A subsea electrical and/or fiber optic interconnect assembly for offshore applications, including oil and gas, defense, oceanographic, and telecommunications applications, the system comprising:
- an MCDU;
- a modular securing device adapted to removably receive and secure the MCDU in remote subsea locations and comprising: a frame having a mounting surface for mounting the securing device to an intended subsea object; a frame guide fixed to the frame and having a generally open end configured to receive the MCDU and being configured to secure the received MCDU in a locked position within the frame, the frame having a substantially open front to allow access to input(s)/output(s) on the front face of the MCDU when in a locked position; an isolation guide received within and affixed to the frame guide and adapted to allow the MCDU to be received within the frame guide, the isolation guide being disposed intermediate the frame guide and the MCDU to substantially isolate the surface of the MCDU from direct contact with the surface of the frame guide and the frame; and a locking key assembly configured to be received by the frame guide and to be removably locked in place on the frame guide so as to prevent the MCDU from inadvertently becoming displaced from the frame when in the locked position.
11. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein said locking key assembly
- a locking key comprising: an elongated body having a front end, a back end, and an exterior surface; a t-shaped handle attached to said back end; a raised protrusion extending vertically from said exterior surface at said front end;
- a spring assembly comprising a tension spring disposed on the elongated body intermediate an inner plate and an outer plate, and said spring surrounding said elongated body between said inner plate and said outer plate; and
- a set of bushings having a front face and a back face, and a central bore, said back face attached to said frame, said set of bushings adapted to receive said front end of said elongated body and having a guide channel adapted to guide said raised protrusion of said locking key when receiving said front end of said elongated body, and a recess formed therein for receiving the raised protrusion;
- whereby with said locking key introduced into said frame said t-shaped handle is adapted to be pushed forward to compress said tension spring between said inner and outer plates and to cause the raised protrusion to extend outward from the guide channel, said locking key adapted to rotate to lock in a fixed position with said raised protrusion engaging the recess, thereby securing a modular connection unit received in the frame central hollow area in place.
12. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein said frame guide comprises oppositely facing left and right frame guide components and are generally C-shaped in cross-section, said isolation guide comprising left and right isolation guide components generally C-shaped in cross-section and configured to be received, respectively, within said left and right frame guide components.
13. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein said isolation guide includes a stop adapted to prevent the MCDU from moving beyond a desired point along the frame guide and from coming into direct contact with the frame.
14. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein the MCDU is received via a top open end of the frame guide and the frame includes a base extending outward away from the mounting surface, and further comprising a stop adapted to prevent the MCDU from moving beyond a desired point along the frame guide and from coming into direct contact with the frame.
15. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein the frame guide and the isolation guide include locking key receiving means for receiving a locking key component of the locking key assembly and with the locking key component in place within the frame guide the locking key component engaging with a surface of the MCDU to hold the MCDU in place within the frame.
16. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein said isolation guide is comprised of a material resistant to galvanic corrosion.
17. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein said locking key assembly is comprised of a material resistant to galvanic corrosion.
18. The subsea electrical and/or fiber optic interconnect assembly of claim 10, wherein the intended object to which the securing device and said frame and MCDU are to be mounted is located in a deep sea environment.
Type: Application
Filed: Aug 23, 2016
Publication Date: Feb 23, 2017
Applicant: Teledyne Instruments, Inc. (Thousand Oaks, CA)
Inventor: Jose Raul Gonzalez (Ormond Beach, FL)
Application Number: 15/245,053