Abstract: The present invention discloses a vibration diaphragm in an MEMS microphone, and an MEMS microphone. The vibration diaphragm comprises a vibration diaphragm body and at least one pressure relief device defined by gaps in the vibration diaphragm body, wherein the gaps comprise at least two sections of circular arc-shaped gaps sequentially connected together. The two adjacent sections of circular arc-shaped gaps are in an S shape as a whole and centrosymmetrical with respect to a connected position thereof. The pressure relief device comprises at least two valve clacks formed by at least two sections of adjacent circular arc-shaped gaps and neck portions connected to the valve clacks and the vibration diaphragm body and of a constraint shape.

Abstract: A gas turbine engine is defined wherein the inlet guide vanes leading into a core engine flow path are sized and positioned such that flow paths positioned circumferentially intermediate the vane are sufficiently large that a hydraulic diameter of greater than or equal to about 1.5 is achieved. This will likely reduce the detrimental effect of icing.

Abstract: Disclosed is a cylinder assembly (1) for a fluid-working machine, the assembly comprising a body (2) having a first end (3) and a second end (4) and comprising a cylinder (5), a poppet valve seat (9) and a face-sealing annular valve seat 7). The cylinder is open to the first end and configured to receive a reciprocating piston (210) and the poppet and annular valve seats extend around an axis through the cylinder. An annular valve including the annular valve seat and an annular valve member extends around the cylinder. Thus, the cylinder assembly is compact. Advantageously, the body is a continuous unitary structure which comprises all of the parts of the body which must be made of, or coated with, a hardened material. Thus the body is stronger and may be constructed with less material than has previously been possible. Additionally, the arrangement of the cylinder body facilitates manufacture, assembly and maintenance of a cylinder assembly and its insertion into the body of a fluid working machine.

Abstract: A check valve. An illustrative embodiment of the check valve includes a valve body, a plurality of discharge port openings having at least one of a non-uniform width and a non-uniform position extending through the valve body and a flexible valve disk disposed generally adjacent to the valve body.

Abstract: A reciprocating compressor or pump features a manifold arranged not only to define a hollow interior for receiving fluid discharged from a plurality of cylinders but also to define a base or frame on which the cylinders are carried. Unique valves formed in part by flexible material reduces the likelihood of fatigue and increases efficiency by retaining less heat relative to conventional reed valves. A compressor or pump mounted at an end of a handle extending parallel to a motor housing likewise extending from the compressor or pump provides an easy to carry portable assembly. A fan mounted between a motor and a compressor pulls air through the compressor inlet to both cool the motor and feed the compressor. A portable tool system powers both pneumatic and electric tools. Connecting rod structures for radial compressors or pumps provide improved strength and easier assembly.

Abstract: A reciprocating compressor including cylinder block with a plurality of cylinder bores. A piston is positioned in each bore and mounted to move in response to the a crankshaft, causing each piston to reciprocate within the cylinder bore. The compressor further includes a cylinder head, which includes bores corresponding to the bores in the cylinder block, and a suction port in fluid communication with a source of compressible gas and a plurality of suction plenum. Protrusions or ribs extend into the suction plenum. The cylinder head also includes a discharge plenum in communication with the outlet ports of the valve plate. Interposed between the cylinder head and the cylinder block is a valve plate assembly having a discharge valve, and a discharge valve retainer having a pair of radii assembled to the valve plate by snap fitting a cylinder head gasket over the discharge valve and retainer.

Abstract: A single-acting manual pump for feeding lubricant to metering units provided in a lubrication line, of the type comprising a body (10) housing a piston (1) movable within a chamber (2) against the action of elastic means (3), and unidirectional valve means (4) provided in correspondence with at least one entry aperture (5) and at least one exit aperture (6) formed in a portion (2A) of said chamber (2), said means being arranged to enable a predefined quantity of lubricant to enter said portion (2A) of the chamber (2) from a reservoir (7) when the piston is raised, and to enable said quantity of lubricant to leave towards a tubular delivery channel (8A, B, C) when the piston (1) is released to return to its rest position by the action of said elastic means.

Abstract: A ring valve assembly for use in a reciprocating type fluid pump with a piston cylinder and a cylinder head includes a ring valve having a fluid seal surface for selectively closing a fluid passage of a cylinder head and an annular ring retainer having a fulcrum edge and tapered top surface. The retainer is positioned beneath the ring valve and a slight clearance is designed in such that the ring valve experiences as a first stage of movement/deflection slight vertical travel. Continued operation of the fluid pump results in a second stage of deflection where the ring valve deflects into a frustoconical shape and lays against the tapered surface of the retainer, pivoting about the fulcrum edge.

Abstract: A diaphragm pump has a first fluid-operated valve which opens when the diaphragm performs a suction stroke and a second fluid-operated valve which opens when the diaphragm performs a compression stroke. The volumetric efficiency of the pump is enhanced by constructing at least one of its valves in such a way that the central portion of a resilient disc-shaped valving element, whose marginal portion bears against a seat when the valve is closed, abuts a supporting surface having a diameter selected in dependency on the diameter of the valving element, the thickness of the valving element and the Shore hardness of the material of the valving element in such a way that the selected frequency of the diaphragm in actual use of the pump induces a resonant frequency of the valving element. This also contributes to a reduction of noise and renders it possible to reduce wear upon the valving element and the adjacent parts of the respective valve.

Abstract: An integral gas compressor and internal combustion engine. The compressor is built by converting a portion of an internal combustion engine to a compressor by removing the original engine head and valve train and replacing these with a compressor head assembly. The compressor head assembly includes compressor valves and valve chairs for holding the compressor valves in place. An inlet manifold encloses all of the valve chairs and places all of the inlet flow paths through the valve chairs in communication with a gas source. The head defines a discharge passageway therethrough which is in communication with a discharge opening. A venting system is provided to vent any gas that might build up in the compressor due to leakage past the piston rings and to transfer this vented gas to a fuel inlet of the engine, as desired. An oil viscosity sensing system is provided for sensing the oil viscosity in the crankcase and shutting down the engine when the viscosity drops below a prdetermined level.

Abstract: A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a reciprocating piston in which the piston includes a suction valve assembly and an annular rim that substantially completely fills the discharge port when the piston is at top dead center position, to reduce re-expansion volume. The cylinder head assembly is attached directly to the cylinder block with no intermediate gasket therebetween, permitting coplanar seating of the discharge valve with a correspondingly larger discharge valve seat perimeter permitting faster valve closure and lower pressure loss through the discharge port.

Abstract: A ring valve assembly for use in a reciprocating type fluid pump with a piston cylinder and a cylinder head is disclosed. The valve assembly includes a ring valve having a fluid seal surface for a selectively closing a fluid passage of a cylinder head and bias means for the ring valve for urging the ring valve in a first direction. The bias means includes the outer peripheral edge region of the ring valve being secured between opposing upper and lower annular surfaces with a predetermined smaller clearance. The upper annular surface includes an outer edge and the lower annular surface includes an inner edge which defines a fulcrum radially inward of the outer edge.

Abstract: A radial piston pump is provided with a plurality of valve/piston cartridges. Each cartridge includes the piston and at least one of the valves connecting the piston to the inlet and outlet passages of the pump. The bearings for the main rotor are pre-loaded using a threadedly adjustable end quill. Once adjusted, the end guill is held in location by a pin or the like. The rotor itself is provided with counterweights to balance the eccentric cam surface. These features allow construction of a pump housing which is substantially a single unit, rather than two pump halves. A significant reduction in the number of machined bores also is obtained.

Abstract: A combination heat shield/gasket is disposed between abutting components in a reciprocating compressor. The heat shield/gasket includes strategically located protuberances, at locations where the components do not directly abut, the tips of which contact one of the components causing the heat shield/gasket to locally deflect away from the contacted component. The deflection of the heat shield/gasket at such non-abutting locations causes a dead space to be created between the component contacted by the tip of the protuberance and the heat shield/gasket. The dead space so created is a barrier to the transfer of heat, as is the heat shield/gasket itself, from the component contacted by the protruberances to the area on the side of the heat shield/gasket opposite that side on which the dead space is created.

Abstract: In a pump valve head for a high-pressure pump having at least three pistons, the axial support of the parts surrounding the inlet valve in the intake connection is hydrostatically enhanced. For this purpose, a fluid flow path is provided between the interior space of the intake connection adjacent the end of the side thereof which faces away from the pump cylinder space, said flow path communicating with an intermediate space between a terminal portion of the inlet valve and a closure member affixed to the intake connection, and a region downstream of the pressure valves of the pump discharge connection. This fluid flow path includes a port in a bushing surrounding the pressure valve as well as annular gaps on the outside periphery of a bushing surrounding the pressure valve, a manifold bushing surrounding a pump plunger and a bushing surrounding the inlet valve.

Abstract: A ring valve apparatus is designed for efficient transfer of liquids and gases and for attaining near-perfect vacuum state of gases. Intake means consist of a flexible ring valve and three ports encompassed by valve seats. Exhaust means include a rigid ring valve, three port openings encompassed by valve, and three cylinders containing spring-loaded plungers. The configuration of the piston head and structure of the valves make possible a complete exhaustion of gases from a cylinder, a feature required for attaining near-perfect vacuum in a chamber.

Abstract: A reciprocating compressor includes an apertured valve disc between a cylinder and a cylinder head. Valve orifices in the disc are arranged about two concentric circles centered on the central axis of the cylinder. The same number of orifices are spaced about each circle and the orifices about the inner circle are offset by half the angular spacing between the orifices spaced about the outer circle. Intake and delivery valve strips and stroke limiters are provided on both sides of the apertured valve disc and connected by a centrally-arranged nut and bolt fastener. The intake and delivery valve strips each comprising a discoidal center area from which narrow, radially-extending arms project outwardly and are formed at their outer ends with circular end portions. A tubular intake duct extends through the top of the cylinder and subdivides the cylinder head chamber into a suction chamber and an outer delivery chamber.

Abstract: The suction gas supply tubes are made integral with the seal for sealing the gap between the cylinder head and the cylinder block caused by the valve assembly. The suction gas supply tubes have flared inlets and a long, narrow tapering cross section to minimize flow loses. Additionally, the length of the tubes is such that they provide pressure pulse attenuation and tuning.

Abstract: A gas compressor drivably connected to an engine operates to supply compressed gas to a tank. The compressor has a housing including a commercial air cooled internal combustion engine block and cooling air system having a single cylinder chamber accommodating a reciprocating piston. The piston moves gas through a head and valve assembly connected to an air-to-air after cooler operable to cool and carry cooled compressed gas to a tank. The head holds the valve assembly on the cylinder. The valve assembly has a first valving ring allowing one-way flow of gas into the cylinder chamber and a second valving ring allowing one-way gas flow out of the cylinder chamber. A heat exchange unit is cooled with air moved by the commercial engine air cooling system of the compressor. The driving engine is of the same make and general type as used for the components of the compressor.

Abstract: A method of assembling a reciprocating compressor, in which a piston for partitioning a cylinder into a compression chamber and a suction chamber is telescoped in the cylinder, a closure end plate is secured at an open end of the cylinder, the end surface of the piston and the bottom surface of the end plate define opposing sides of the compression chamber, the piston is perforated by a suction port for communicating between the compression chamber and the suction chamber, and a suction valve sits on the piston for opening and closing the suction port, comprising the following steps; (1) manufacturing in advance a plurality of closure end plate, the i-th end plate having a bottom surface formed by a projection of different height h.sub.i ; (2) defining two reference positions of the piston and cylinder, respectively, for the i-th compressor and measuring the interval D.sub.i between the reference positions; (3) selecting an end plate which has a projection of such a height that D.sub.i -h.sub.

Abstract: A reciprocating compressor comprises a piston body reciprocally movably disposed within a cylinder housing and having first and second pistons which are coaxially aligned with each other. The first and second pistons define respectively first and second chambers within the cylinder housing. Intake and discharge valves are provided to allow therethrough a fluid to be sucked into and to be discharged out of each cylinder chamber, respectively. Additionally, the compressor is provided with a device for changing the rotary motion of a drive shaft into the reciprocating motion of the piston body. Accordingly, the compressor becomes small-sized and light in weight and is simplified in construction, thereby considerably reducing parts thereof.

Abstract: A valve mount for a compressor pressure valve with a valve seat disposed in a bore formed in a cylinder head, wherein the valve mount is provided with a cooling chamber surrounding the external surfaces of a pressure chamber for transferring and dissipating heat from the valve parts including the valve seat.

Abstract: An improved low stress reed valve especially adapted for use as a suction or discharge valve in a reciprocating compressor or the like. The geometry and the relationship of certain key dimensions result in a substantially reduced stress on the valve, thus extending the life of such valves in normal operation.

Abstract: A valve arrangement for a compressor, particularly a compressor for compressing refrigerant, in which a compressor is provided with ports distributed circumferentially about the axis of the piston and cylinder of the compressor and with a valve member in the form of a ring adjacent the ports for controlling the ports. Associated with the valve ring is a spring in the form of a wave washer urging the ring toward the valve ports. The ring forming the movable member of the valving arrangement and the wave washer serving as a spring require the minimum in space and have long life because the fatigue factor in respect of both is quite small.

Abstract: A valve plate construction for use in a refrigerant compressor is disclosed. A method of assembling and joining by brazing a pair of end plates, a spacer plate defining radial passages and a collar defining an axial passage is described. The product is then a unitary structure formed of the various plates having a central axial passage and a plurality of radial passages.

Abstract: A system for protecting a machine against thermal overload, in particular, a compressor, and more particularly still, in respect of thermal protection of the valving of a compressor. The compressor is provided with a heat sensitive element in close proximity to the valving and in good heat exchange relation with gas passing through the valving, particularly, the gas being discharged through the valving. The heat sensitive element is connected in controlling relation to the drive motor for the compressor.

Abstract: A piston compressor is disclosed which comprises a cylinder head having a channel of essential length for cooling the compressed fluid before it leaves the compressor.

Abstract: An improved valve assembly for a reciprocating compressor including a valve member having inlet openings, a valve positioned adjacent the valve member being arranged to cover the inlet openings, a valve backing surface dimensioned to allow controlled movement of the valve, and a valve positioning member located between the valve member and the backing surface. The valve positioning member includes retaining portions for receiving support sections on the valve and tabs associated with the retaining portion to prevent rotational movement of the valve relative to the valve positioning member.

Abstract: Valve means for use in a reciprocating compressor having cylinder means with a piston operable therein. The valve means include an inlet body and a discharge valve assembly, with the inlet body having a base incorporating an inner wall member and an outer wall member extending therefrom in spaced, concentric relationship. The wall members have a plurality of spaced recesses therein and a top is secured to the wall members remote from the base so as to define a passageway having a plurality of openings in both the inner wall member and the outer wall member. The volume of internal flow passages is relatively large and thus there is reduced pressure drop of gas passing through the inlet body. The base and the top are bonded to one another by brazing to form the inlet body. The construction is simple, is readily fabricated by mass production techniques, and is relatively inexpensive.