Strainer and Strainer Control System
A screening apparatus that includes a strainer element used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, a support structure for the strainer element to enable rotation of the strainer element between opposed 180 degree positions, and a control member coupled with the strainer element for controlling the rotation of the strainer element. The strainer element, in both opposed positions thereof impedes any particulate while permitting the passage of a liquid. The control member is constructed so that, in a first state thereof, the rotation of the strainer element is periodically controlled to rotate the strainer element between said opposed 180 degree positions, and in a second state thereof, inhibits rotation of the strainer element.
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The present invention relates in general to strainers that may be used in such applications as filtration and fluid flow safety. More particularly, the present invention relates to an improved strainer construction as well as an associated control system. Even more particularly, the present invention relates to a method of controlling a strainer element.
BACKGROUND OF THE INVENTIONIn the field of filtration and fluid flow safety there is relatively common use of a device that is identified as a strainer. The strainer or screening device is used to retain foreign objects. The strainer is usually a fixed position device. It is typical to provide access to the strainer for cleaning the strainer. However, this access is many times not very convenient. Also, the typical strainer device is not suited for the receipt and processing of objects that are the result of an upstream breakage or destruction.
Accordingly, it is an object of the present invention to provide an improved screening apparatus in the form of a strainer element, and in which the strainer element is rotatable through 180 degrees in accordance with one mode of operation. This mode of operation enables any foreign objects collected at the strainer to be periodically released.
Another object of the present invention is to provide a control system for controlling a strainer, particularly as to its rotation parameter. The system of the present invention provides an improvement in the overall process so as to maximize the uptime of the process, while simultaneously protecting against any upset or unacceptable event that may occur downstream of the strainer.
Still another object of the present invention is to provide a control system for controlling a strainer element that enables the strainer element, in one mode of operation, to be locked in position so that any foreign objects, debris or detritus is retained at the strainer element for subsequent collection. In accordance with another mode of operation of the control system of the present invention, foreign objects, particularly debris or detritus, may be diverted to a collection receptacle.
A further object of the present invention is to provide a method of controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, and in which control is of, not only the rotation of the strainer element, but also control of valves so as to divert debris or detritus to a collection receptacle.
SUMMARY OF THE INVENTIONTo accomplish the foregoing and other objects, features and advantages of the present invention there is provided a screening apparatus comprising a strainer element used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, a support structure for the strainer element to enable rotation of the strainer element between opposed 180 degree positions, and a control member coupled with the strainer element for controlling the rotation of the strainer element. The strainer element, in both opposed positions thereof impedes any particulate while permitting the passage of a liquid. The control member is constructed and arranged so that, in a first state thereof, the rotation of the strainer element is periodically controlled to rotate the strainer element between said opposed 180 degree positions, and in a second state thereof, inhibits rotation of the strainer element.
In accordance with other aspects of the present invention the support structure includes a frame, and the strainer element includes a circular strainer member mounted in the frame and a shaft for supporting the strainer member relative to the frame; the control member includes an electro-mechanical mechanism that, in the first state periodically controls the rotation of the shaft between the opposed positions, and in the second state inhibits rotation of the shaft; including a downstream processing device that has the ability to generate a fault signal, the fault signal for controlling the electro-mechanical mechanism, in its second state, to inhibit rotation of the circular strainer member; including, in combination therewith, a first valve disposed upstream of the strainer element and having open and closed positions, the first valve being in the open position in the first state, and being in the closed position in the second state; including, in combination therewith, a second valve disposed upstream of the strainer element and having closed and open positions, the second valve being in the closed position in the first state, and being in the open position in the second state; the control member includes a timer set to determine the periodic control; the control member includes a pressure sensor to determine the periodic control.
In accordance with another aspect of the present invention there is provided a control system for controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, the strainer element rotatable between opposed 180 degree positions, and an electrical controller coupled with the strainer element and for controlling the rotation of the strainer element. The strainer element, in both opposed positions thereof impedes any particulate matter while permitting the passage of a liquid through the strainer element. The electrical controller is constructed and arranged so that, in a first state thereof, the rotation of the strainer element is periodically controlled to rotate the strainer element between the opposed 180 degree positions, and in a second state thereof, is controlled to inhibit rotation of the strainer element.
In accordance with still other aspects of the present invention the rotation of the strainer element includes a support structure having a frame, and the strainer element includes a circular strainer member mounted in the frame and a shaft for supporting the strainer member relative to the frame, the shaft being rotatable in order to rotate the circular strainer member; further including an electro-mechanical mechanism that, in the first state periodically controls the rotation of the shaft and, in turn, the circular strainer member between the opposed positions, and in the second state inhibits rotation of the shaft and, in turn, the circular strainer member; including a downstream processing device that generates a fault signal in response to a fault condition that has occurred, said fault signal for controlling the electro-mechanical mechanism, its second state, to inhibit rotation of said circular strainer member; including a first valve disposed upstream of said strainer element and having open and closed positions, said first valve being in the open position in the first state, and being in the closed position in the second state; including a second valve disposed upstream of said strainer element and having closed and open positions, said second valve being in the closed position in the first state, and being in the open position in the second state; the electrical controller includes a timer set to determine the periodic control; including a downstream processing device that generates a fault signal in response to a fault condition that has occurred and wherein said electrical controller further includes a gate device that is coupled from the timer and also receives the fault signal; the control member includes a pressure sensor to determine the periodic control; including a downstream processing device that generates a fault signal in response to a fault condition that has occurred and wherein said electrical controller further includes a gate device that is coupled from the pressure sensor and also receives the fault signal.
In accordance with still other aspects of the present invention there is provided a method of controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, comprising controlling the strainer element so as to rotate between opposed 180 degree positions, controlling the strainer element so that the strainer element, in both opposed positions thereof, impedes any particulate matter while permitting the passage of a liquid through the strainer element, controlling, in a first state, the rotation of the strainer element so that the strainer element is periodically rotated between said opposed 180 degree positions, and controlling in a second state thereof, so as to inhibit rotation of the strainer element. Other aspects include providing a first valve disposed upstream of said strainer element and having open and closed positions, controlling said first valve to be in the open position in the first state, and controlling said first valve to be in the closed position in the second state; providing a second valve disposed upstream of said strainer element and having closed and open positions, controlling said second valve to be in the closed position in the first state, and controlling said second valve to in the open position in the second state; and providing a downstream processing device that generates a fault signal in response to a fault condition that has occurred, said fault signal for controlling said first and second valves.
It should be understood that the drawings are provided for the purpose of illustration only and are not intended to define the limits of the disclosure. In the drawings depicting the present invention, all dimensions are to scale. The foregoing and other objects and advantages of the embodiments described herein will become apparent with reference to the following detailed description when taken in conjunction with the accompanying drawings in which:
Reference is now made to the block diagrams illustrating different modes of operation of the strainer and associated control system for the strainer. One of the purposes of the control system, along with the unique construction of the strainer element, is to maximize the up-time of the system operation. Another feature that is described with regard to the block diagrams is a system for protecting against any fault event or process upset when debris or detritus become entrained in the fluid flow.
With reference to the schematic block diagram of
In the system in
If a fault event occurs, and with further reference to
With reference to the schematic block diagram of
In the system in
In
With reference to the schematic block diagram of
With reference to the schematic block diagram of
In the system in
In a “no fault” state, one can consider that the signal on line 30 is at a logical “0” level. This signal is inverted at the inverter gate 50 so that the signal on the line is at a logical “1” state. This signal, along with the output of the timer 26 on line 55 is coupled to the AND gate 52. The signal on line 51 essentially enables the gate 52 so that any signal pulse from the timer 28 is coupled directly through the AND gate 52 to the OR gate 54, and, in turn, via the delay circuit 56 and lines 57 and 58 to the strainer 14 for control of the rotation of the strainer 14. The periodic output from the timer 26 may be a pulse for operating the electro-mechanical mechanism 46 (see
If a “fault” event occurs, and with further reference to
It is desired in accordance with this “fault” mode of operation that any of the foreign objects (event items), instead of being discharged through the valve 16 to location 21, are discharged through the valve 18 to the collection receptacle 20. Thus, in this mode of operation when the output is generated at the line 53, this causes the valve 16 to switch from a normally open to a closed position. This blocks the flow of liquid to the discharge at location 21. At the same time, the valve 18, which is a normally closed valve, opens and thus the foreign objects (event items) are conveyed from the strainer 14, by way of the valve 18, to the collection receptacle 20. This collection receptacle 20 is particularly suited for receiving fault derived items for inspection thereof.
Having now described a limited number of embodiments of the present invention, it should now be apparent to those skilled in the art that numerous other embodiments and modifications thereof are contemplated as falling within the scope of the present invention, as defined by the appended claims. For example, the strainer that has been used is considered as rotating through 180 degrees between positions. However, there may be other strainer configurations in which opposite positions could be attained by means of rotation amounts less than or greater than 180 degrees.
Claims
1.-18. (canceled)
19. A method of controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, comprising
- controlling the strainer element so as to rotate between opposed 180 degree positions,
- controlling the strainer element so that the strainer element, in both opposed positions thereof, impedes any particulate matter while permitting the passage of a liquid through the strainer element,
- controlling, in a first state, the rotation of the strainer element so that the strainer element is periodically rotated between said opposed 180 degree positions, and
- controlling in a second state thereof, so as to inhibit rotation of the strainer element.
20. The method of claim 19 including providing a first valve disposed downstream of said strainer element and having open and closed positions, controlling said first valve to be in the open position in the first state, and controlling said first valve to be in the closed position in the second state.
21. The method of claim 20 including providing a second valve disposed downstream of said strainer element and having closed and open positions, controlling said second valve to be in the closed position in the first state, and controlling said second valve to in the open position in the second state.
22. The method of claim 21 including providing an upstream processing device that generates a fault signal in response to a fault condition that has occurred, said fault signal for controlling said first and second valves.
23. A method of controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, comprising: controlling the strainer element by means of an electrical controller, so as to rotate between opposed 180 degree positions, controlling the strainer element so that the strainer element, in both opposed 180 degree positions thereof, impedes any particulate matter while permitting the passage of a liquid through the strainer element, controlling, in a first state, the rotation of the strainer element so that the strainer element is periodically rotated between said opposed 180 degree positions, and controlling in a second state thereof, so as to inhibit rotation of the strainer element, providing an upstream processing device that generates a fault signal in response to a fault condition that has occurred, providing a first valve disposed downstream of said strainer element and having open and closed positions, controlling said first valve from the electrical controller to be in the open position in the first state, and controlling said first valve from the electrical controller to be in the closed position in the second state, and providing a second valve disposed downstream of said strainer element and having closed and open positions, controlling said second valve from the electrical controller to be in the closed position in the first state, and controlling said second valve from the electrical controller to in the open position in the second state.
24. The method of claim 23 including providing alternate sites to which the first and second valves connect.
25. The method of claim 24 wherein one of the alternate sites is a fault collection site.
26. The method of claim 25 including connecting the second valve to the fault collection site.
27. The method of claim 26 wherein another of the alternate sites is a discharge site.
28. The method of claim 27 including connecting the first valve to the discharge site.
29. The method of claim 24 wherein one of the alternate sites is a discharge site.
30. The method of claim 29 including connecting the first valve to the discharge site.
31. A method of controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, comprising controlling the strainer element by means of an electrical controller, so as to control the movement of the strainer element between alternate positions including a retaining position in which particulate or objects are impeded by the strainer element and a release position in which particulate or objects are released through the strainer element, providing a piping system from the strainer to alternate separate sites including a discharge site and a collection site, sensing a fault condition upstream of the strainer element to provide either a fault signal or a no fault signal depending on whether there is a fault upstream or not, said electrical controller being responsive to the sensed fault condition to perform one of, connect the strainer element in the release position via the piping system to the collection site responsive to the fault signal, and connect the strainer element in the release position via the piping system to the discharge site responsive to the no fault signal.
32. The method of claim 31 wherein the step of connecting the strainer element in the release position via the piping system to the discharge site is by means of a first valve controlled from said electrical controller.
33. The method of claim 31 wherein the step of connecting the strainer element in the release position via the piping system to the collection site is by means of a second valve controlled from said electrical controller.
34. The method of claim 31 including controlling at the electrical controller by means of one of a timer and pressure sensor.
35. The method of claim 31 wherein the step of connecting the strainer element in the release position via the piping system to the discharge site is by means of a first valve controlled from said electrical controller; wherein the step of connecting the strainer element in the release position via the piping system to the collection site is by means of a second valve controlled from said electrical controller; and wherein the fault condition provides a fault material to be collected upon detection of the fault signal.
36. A method of controlling a strainer element that is used for the purpose of retaining particulate while permitting the passage of a liquid through the strainer element, comprising controlling the strainer element so as to control the movement of the strainer element between alternate positions including a retaining position in which particulate or fault objects are impeded by the strainer element and a release position in which particulate or fault objects are released through the strainer element, providing a fault collection site in a piping system coupled from the strainer element, sensing a fault condition upstream of the strainer element to provide either a fault signal or a no fault signal depending on whether there is a fault upstream or not, and in response to a fault signal that is sensed, releasing the strainer element so as to convey any fault object retained at the strainer element to the fault site.
37. The method of claim 36 including connecting the strainer element in the release position via the piping system to the fault collection site by means of a control valve.
38. The method of claim 37 including providing a second valve connected from the piping system to a discharge site that is different than the collection site.
Type: Application
Filed: Jul 11, 2016
Publication Date: Jan 19, 2017
Applicant: Neptune-Benson, LLC (Coventry, RI)
Inventor: Paul F. Nehlen, III (Lake Geneva, WI)
Application Number: 15/207,119