Pneumatic hysteresis valve and gas delivery tube set

Abstract

The application discloses a kind of pneumatic hysteresis valve and gas pipe group, pneumatic hysteresis valve includes valve body and pneumatic actuator;Valve body includes valve pipe and valve core board rotationally arranged in valve pipe, and the side wall of valve pipe is provided with the hole that goes in, and valve pipe is used to butt joint on gas pipeline;Pneumatic actuator is arranged on the outer wall of valve pipe, and it has movable rod and three gas connection ports, movable rod is inserted into valve pipe through hole, and is drivingly connected with valve core board, one gas connection port is located upstream of pneumatic hysteresis valve with the communication of gas pipeline, one gas connection port is located downstream of regulating valve with the communication of gas pipeline, and the remaining one gas connection port is located between pneumatic hysteresis valve and regulating valve with the communication of gas pipeline.Such that when the pressure fluctuation of gas pipeline gas inlet end, pneumatic hysteresis valve can be automatically adjusted opening according to the pressure change introduced at three gas connection ports, to buffer upstream gas pressure fluctuation, while ensuring that the downstream gas flow remains relatively constant.

Description

Technical Field

[0001] This invention belongs to the technical field of gas transmission valves, and particularly relates to a pneumatic hysteresis valve and a gas transmission pipeline assembly. Background Technology

[0002] In the field of gas pipelines, regulating valves are installed on the gas pipelines to regulate the gas flow rate. When the inlet pressure at the gas inlet end of the gas pipeline is stable, the downstream exhaust flow rate is also relatively stable. However, in actual operation, the inlet pressure at the gas inlet end of the gas pipeline usually fluctuates, and the fluctuation range is sometimes large (exceeding the kPa level). This will cause the pressure at the exhaust end of the gas pipeline to be unstable, thereby affecting the normal operation of downstream equipment and process safety. To overcome this problem, a pressure stabilizing valve is often added upstream of the regulating valve on the gas pipeline. However, mechanical pressure stabilizing valves are not sensitive enough for high flow rate and low pressure differential conditions, and their response is relatively slow. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, one of the objectives of the present invention is to provide a pneumatic hysteresis valve with a simple structure that can automatically buffer and adjust the pressure fluctuation at the inlet end according to the pressure of the upstream, midstream and downstream of the gas pipeline.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a pneumatic hysteresis valve, which is used to be installed on a gas transmission pipeline and located upstream of a regulating valve, the pneumatic hysteresis valve including a valve body and a pneumatic actuator; The valve body includes a valve tube and a valve core plate rotatably disposed inside the valve tube. The valve tube has a through hole on its side wall and is used to connect to the gas transmission pipeline. The pneumatic actuator is disposed outside the valve tube and has a movable rod and three air inlets. The movable rod is sealed and inserted into the valve tube through the insertion hole and is connected to the valve core plate. The three air inlets are used to communicate with the air supply pipeline. The three air inlets are the first air inlet, the second air inlet, and the third air inlet. The connection between the first air inlet and the air supply pipeline is located upstream of the pneumatic hysteresis valve. The connection between the second air inlet and the air supply pipeline is located downstream of the regulating valve. The connection between the third air inlet and the air supply pipeline is located between the pneumatic hysteresis valve and the regulating valve. When the regulating valve is in the open state, if there is a pressure fluctuation at the inlet of the gas pipeline, the pneumatic actuator is used to adjust the opening of the valve body according to the pressure difference at the three gas inlets, so as to maintain the flow rate of the gas flowing through the regulating valve relatively stable.

[0005] The beneficial effect of the above technical solution is that, when the pressure at the gas inlet of the gas pipeline fluctuates, the pneumatic hysteresis valve can automatically adjust its opening according to the pressure changes introduced at the three gas inlets, while keeping the opening of the regulating valve unchanged. This buffers the upstream gas pressure fluctuations and ensures that the downstream gas flow rate remains relatively constant. If the pressure at the gas inlet increases, the opening of the pneumatic hysteresis valve will automatically decrease, and if the pressure at the gas inlet decreases, the opening of the pneumatic hysteresis valve will automatically increase.

[0006] The pneumatic actuator described in the above technical solution further includes a housing, a piston plate, a piston ring, a limiting plate, and two elastic elements. The housing is hollow to form a piston chamber. The housing is disposed outside the valve tube. The piston plate and piston ring are both slidably and sealingly disposed within the piston chamber, dividing the piston chamber into three chambers, which are sequentially designated as a first chamber, a second chamber, and a third chamber. The piston ring is located between the second and third chambers. The limiting plate is located within the second chamber. The housing has a through hole communicating with the third chamber, and the through hole is aligned with the inner hole of the piston ring. The movable rod is located within the... One end of the valve tube passes through the outlet hole and the inner hole of the piston ring in a sealed sliding manner, and is perpendicularly connected to the limiting plate in the second chamber. Each side of the limiting plate is provided with an elastic element to connect with the piston plate and piston ring on the corresponding side. All three air inlets are provided on the housing. The first air inlet communicates with the first chamber, the second air inlet communicates with the second chamber, and the third air inlet communicates with the third chamber. The two elastic elements are a first elastic element and a second elastic element. The first elastic element is disposed between the limiting plate and the piston plate, and the second elastic element is disposed between the limiting plate and the piston ring.

[0007] The beneficial effect of the above technical solution is that when the upstream pressure of the pneumatic hysteresis valve 1 fluctuates, the pneumatic actuator will drive the valve body to quickly adjust the opening degree under the action of the upstream and downstream pressure difference. Later, as the midstream pressure changes in the opposite direction, the pneumatic actuator will adjust the opening degree of the valve body slightly back until the valve body finally reaches a stable state.

[0008] In the above technical solution, the first air inlet and the third air inlet are located at the two ends of the housing, and the second air inlet is located in the middle of the housing along its length.

[0009] The beneficial effect of the above technical solution is that it can prevent the piston plate or piston ring from sliding and blocking the second air inlet.

[0010] In the above technical solution, a limiting ring is provided on the inner wall of the housing corresponding to the middle part of its length direction, and the second air inlet is located on the limiting ring.

[0011] The beneficial effect of the above technical solution is that it can further prevent the piston plate or piston ring from sliding and blocking the second air inlet.

[0012] In the above technical solution, the first elastic element includes a plurality of first springs, which are evenly spaced circumferentially between the limiting plate and the piston plate. The second elastic element includes a second spring, which is sleeved on the movable rod, or the second elastic element includes multiple second springs, which are evenly spaced circumferentially between the limiting plate and the piston ring.

[0013] The beneficial effects of the above technical solution are: it makes the installation of the second elastic element convenient, and the multiple first springs are arranged in a circumferential interval, which makes the force distribution between the limiting plate and the piston plate more balanced.

[0014] The piston plate and piston ring described in the above technical solution are coated with fluororubber or silicone rubber on both sides.

[0015] The beneficial effect of the above technical solution is that it makes the piston plate and piston rings have good corrosion resistance.

[0016] In the above technical solution, the valve core plate is a circular plate that mates with the inner hole of the valve tube. A rotating shaft is radially arranged in the middle of the valve core plate. The rotating shaft is distributed radially inside the valve tube, and its two ends extend to be rotatably connected to the inner wall of the valve tube. The axial direction of the through hole is perpendicular to the rotating shaft, and the two are staggered along the axial direction of the valve tube. One end of the movable rod located inside the valve tube is connected to the corresponding side of the valve core plate through a connecting member. The movable rod moves axially to drive the valve core plate to rotate to open or close the valve tube.

[0017] The beneficial effect of the above technical solution is that when the movable rod slides along the insertion hole to adjust its length extending into the valve tube, the valve core plate can rotate around the rotating shaft to adjust the opening of the valve body.

[0018] The connecting component in the above technical solution includes a connecting rod and two U-shaped hinge seats. One of the hinge seats is located at one end of the movable rod inside the valve tube, and the other hinge seat is located in the middle of the valve core plate and on the side of the rotating shaft away from the through hole. The two ends of the connecting rod are rotatably connected to the two hinge seats respectively.

[0019] The beneficial effect of the above technical solution is that it allows the connecting member to provide a certain amount of movement at the connection between the movable rod and the valve core plate.

[0020] The second objective of this invention is to provide a gas pipeline assembly with a simple structure and whose gas flow rate is not affected by pressure fluctuations at the inlet end.

[0021] To achieve the above objectives, another technical solution of the present invention is as follows: a gas pipeline assembly, comprising a gas pipeline, a regulating valve, and a pneumatic hysteresis valve as described above, wherein both the pneumatic hysteresis valve and the regulating valve are connected to the gas pipeline, and the pneumatic hysteresis valve is located upstream of the regulating valve. All three gas inlets are connected to the gas pipeline. The first gas inlet is located upstream of the pneumatic hysteresis valve at its connection point with the gas pipeline, the second gas inlet is located downstream of the regulating valve at its connection point with the gas pipeline, and the third gas inlet is located between the pneumatic hysteresis valve and the regulating valve at its connection point with the gas pipeline.

[0022] The beneficial effect of the above technical solution is that when the pressure fluctuates at the gas inlet of the gas pipeline, the pneumatic hysteresis valve can play a buffering role upstream of the regulating valve, and can also adaptively adjust the opening to ensure that the output flow rate downstream of the gas pipeline remains relatively stable.

[0023] The gas pipeline described in the above technical solution is provided with three bypass ports, namely a first bypass port, a second bypass port, and a third bypass port. The first bypass port is located upstream of the regulating valve and is connected to the first gas inlet. The second bypass port is located downstream of the regulating valve and is connected to the second gas inlet. The third bypass port is located between the pneumatic hysteresis valve and the regulating valve and is connected to the third gas inlet.

[0024] The beneficial effect of the above technical solution is that it makes it easier to connect the three air inlets of the pneumatic actuator to the air supply pipeline. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the gas pipeline assembly described in an embodiment of the present invention; Figure 2 This is a schematic diagram of the pneumatic hysteresis valve described in an embodiment of the present invention; Figure 3 This is an elevation view of the valve body in the closed state as described in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the valve body in the closed state according to an embodiment of the present invention; Figure 5 This is an elevation view of the valve body in the open state as described in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the valve body in the open state according to an embodiment of the present invention.

[0026] In the diagram: 1. Pneumatic hysteresis valve; 11. Valve body; 111. Valve pipe; 1111. Through hole; 1112. Flange ring; 112. Valve core plate; 1121. Rotating shaft; 12. Pneumatic actuator; 121. Moving rod; 122. Housing; 1221a. First air inlet; 1221b. Second air inlet; 1221c. Third air inlet; 1222a. First chamber; 1222b. Second chamber; 1222c. Third chamber; 1 223. Through hole; 1224. Limiting ring; 123. Piston plate; 124. Piston ring; 125. Limiting plate; 126a. First elastic element; 126b. Second elastic element; 1261. First spring; 1262. Second spring; 13. Connecting piece; 131. Connecting rod; 132. Hinge seat; 2. Gas pipeline; 21a. First bypass interface; 21b. Second bypass interface; 21c. Third bypass interface; 3. Regulating valve. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0030] It should be noted that the terms "installation," "connection," and "linking" have the same meaning. When one component is considered to be "connected" to another component, it can be directly connected to the other component or connected to the other component through an intermediary component. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0031] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0032] When used herein, the singular forms of “a” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” or “having” specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0033] like Figure 1 and Figure 2As shown, this embodiment provides a pneumatic hysteresis valve 1, which is installed on an air supply pipeline 2 and located upstream of a regulating valve 3. The pneumatic hysteresis valve 1 includes a valve body 11 and a pneumatic actuator 12. The valve body 11 includes a valve tube 111 and a valve core plate 112 rotatably disposed within the valve tube 111. An insertion hole 1111 is provided on the side wall of the valve tube 111, and the valve tube 111 is used to connect to the air supply pipeline 2. The pneumatic actuator 12 is disposed outside the valve tube 111 and has a movable rod 121 and three air inlets. The movable rod 121 is sealed and inserted into the valve tube 111 through the insertion hole 1111 and is kinetically connected to the valve core plate 112. All three air inlets are used to communicate with the air supply pipeline 2. The air inlets are a first air inlet 1221a, a second air inlet 1221b, and a third air inlet 1221c. The first air inlet 1221a is connected to the air supply pipe 2 upstream of the pneumatic hysteresis valve 1. The second air inlet 1221b is connected to the air supply pipe 2 downstream of the regulating valve 3. The third air inlet 1221c is connected to the air supply pipe 2 between the pneumatic hysteresis valve 1 and the regulating valve 3. When the regulating valve 3 is open, if there is a pressure fluctuation at the air inlet of the air supply pipe 2, the pneumatic actuator 12 adjusts the opening of the valve body 11 according to the pressure difference at the three air inlets to maintain a relatively stable airflow through the regulating valve 3. This allows the pneumatic hysteresis valve 1 to automatically adjust its opening based on the pressure changes introduced at the three gas inlets when the pressure at the inlet of the gas pipeline 2 fluctuates, while keeping the opening of the regulating valve 3 unchanged. This buffers the upstream pressure fluctuations and ensures that the downstream gas flow remains relatively constant. If the pressure at the inlet increases, the opening of the pneumatic hysteresis valve 1 will automatically decrease, and if the pressure at the inlet decreases, the opening of the pneumatic hysteresis valve 1 will automatically increase.

[0034] Figure 1 The middle arrow indicates the direction of airflow inside the gas pipeline.

[0035] In this embodiment, the pneumatic actuator 12 is equivalent to a pneumatic telescopic drive, which drives its movable rod 121 to extend or retract under the pressure difference of the three air inlets to adjust the opening of the valve core plate 112. Specifically, when the pressure at the air inlet of the air supply pipe 2 increases, the opening of the pneumatic hysteresis valve 1 decreases, thereby keeping the flow rate downstream of the regulating valve 3 relatively constant. Similarly, when the pressure at the air inlet of the air supply pipe 2 decreases, the opening of the pneumatic hysteresis valve 1 increases, thereby keeping the flow rate downstream of the regulating valve 3 relatively constant.

[0036] like Figure 2As shown, in this embodiment, the pneumatic actuator 12 further includes a housing 122, a piston plate 123, a piston ring 124, a limiting plate 125, and two elastic members. The housing 122 is hollow to form a piston chamber. The housing 122 is disposed outside the valve tube 111. The piston plate 123 and the piston ring 124 are both slidably disposed in the piston chamber, dividing the piston chamber into three chambers, which are sequentially designated as a first chamber 1222a, a second chamber 1222b, and a third chamber 1222c. The piston ring 124 is located between the second chamber 1222b and the third chamber 1222c. The limiting plate 125 is located inside the second chamber 1222b. The housing 122 is provided with a through hole 1223 that communicates with the third chamber 1222c. The through hole 1223 is aligned with the inner hole of the piston ring 124. The movable rod 121 is located within the... One end of the valve tube 111 passes through the through hole 1223 and the inner hole of the piston ring 124 in a sealed and sliding manner, and is perpendicularly connected to the limiting plate 125 in the second chamber 1222b. Each side of the limiting plate 125 is provided with an elastic element to connect with the corresponding piston plate 123 and piston ring 124. Three air inlets are provided on the housing 122. The first air inlet 1221a communicates with the first chamber 1222a, the second air inlet 1221b communicates with the inside of the second chamber 1222b, and the third air inlet 1221c communicates with the inside of the third chamber 1222c. The two elastic elements are a first elastic element 126a and a second elastic element 126b. The first elastic element 126a is disposed between the limiting plate 125 and the piston plate 123, and the second elastic element 126b is disposed between the limiting plate 125 and the piston ring 124. When the upstream pressure of the pneumatic hysteresis valve 1 fluctuates, the pneumatic actuator 12 will drive the valve body 11 to quickly adjust its opening under the action of the pressure difference between the upstream and downstream. Later, as the midstream pressure changes in the opposite direction, the pneumatic actuator 12 will adjust the opening of the valve body 11 slightly back until the valve body 11 finally reaches a stable opening.

[0037] Specifically, in this embodiment, the insertion hole 1111 is aligned with the outlet hole 1223, and the housing 122 can be fixedly installed on the outer wall of the valve tube 111 (specifically, it can be welded, integrally formed, or installed on the valve tube 111 by a combination of bolts and nuts).

[0038] like Figure 2As shown, in this embodiment, the first air inlet 1221a and the third air inlet 1221c are located at both ends of the housing 122, and the second air inlet 1221b is located at the middle of the housing 122 along its length. This prevents the piston plate 123 or piston ring 124 from sliding and blocking the second air inlet 1221b.

[0039] like Figure 2 As shown, in this embodiment, a limiting ring 1224 protrudes from the middle of the inner wall of the housing 122 along its length direction, and the second air inlet 1221b is located on the limiting ring 1224. This further prevents the piston plate 123 or piston ring 124 from sliding and blocking the second air inlet 1221b. At this time, the piston plate 123 and piston ring 124 slide on both sides of the limiting ring 1224 respectively.

[0040] like Figure 1 and Figure 2 As shown, in this embodiment, the first elastic element 126a includes a plurality of first springs 1261, which are evenly spaced in the circumferential direction between the limiting plate 125 and the piston plate 123 (the two ends of the first spring 1261 are respectively connected to the piston plate 123 and the limiting plate 125).

[0041] like Figure 1 and Figure 2 As shown, the second elastic element 126b includes a second spring 1262, which is sleeved on the movable rod 121. Alternatively, the second elastic element 126b may include multiple second springs 1262, which are evenly spaced circumferentially between the limiting plate 125 and the piston ring 124. This facilitates the installation of the second elastic element 126b. Furthermore, the circumferential spacing of the multiple first springs 1261 ensures a more balanced force distribution between the limiting plate 125 and the piston plate 123 (the two ends of the second spring 1262 are connected to the piston ring 124 and the limiting plate 125, respectively).

[0042] In this embodiment, the limiting plate 125, piston ring 124 and piston plate 123 are parallel to each other, and the size of the limiting plate 125 is smaller than the size of the piston plate 123. The limiting plate 125 can pass normally through the inner hole of the limiting ring 1224.

[0043] In this embodiment, both sides of the piston plate 123 and piston ring 124 are coated with fluororubber or silicone rubber. This gives the piston plate 123 and piston ring 124 good corrosion resistance.

[0044] like Figures 3-6As shown, in this embodiment, the valve core plate 112 is a circular plate that mates with the inner hole of the valve tube 111. A rotating shaft 1121 is radially arranged in the middle of the valve core plate 112. The rotating shaft 1121 is distributed radially within the valve tube 111, and its two ends extend to be rotatably connected to the inner wall of the valve tube 111. The axial direction of the through hole 1111 is perpendicular to the rotating shaft 1121, and the two are offset along the axial direction of the valve tube 111. One end of the movable rod 121 located inside the valve tube 111 is connected to the corresponding side of the valve core plate 112 via a connecting member 13. The movable rod 121 moves axially to drive the valve core plate 112 to rotate to open or close the valve tube 111. This allows the movable rod 121 to slide along the insertion hole 1111 to adjust its length extending into the valve tube 111, at which time the valve core plate 112 can rotate around the rotating shaft 1121 to adjust the opening of the valve body 11.

[0045] like Figures 3-6 As shown, in this embodiment, the connector 13 includes a connecting rod 131 and two U-shaped hinge seats 132. One hinge seat 132 is disposed at one end of the movable rod 121 located inside the valve tube 111, and the other hinge seat 132 is disposed in the middle of the valve core plate 112 and located on the side of the rotating shaft 1121 away from the through hole 1111. The two ends of the connecting rod 131 are respectively rotatably connected to the two hinge seats 132. This allows the connector to provide a certain amount of movement at the connection between the movable rod 121 and the valve core plate 112.

[0046] The operating principle of the pneumatic hysteresis valve 1 described in this embodiment is as follows: The three air inlets are used to introduce the pressure at the corresponding location of the gas pipeline 2 into the corresponding chambers. The pressure in the first chamber 1222a is P1, the pressure in the second chamber 1222b is P2, and the pressure in the third chamber 1222c is P3. When the pressure at the gas inlet of the gas pipeline 2 changes abruptly (i.e., when P1 changes abruptly), the pressure change in the third chamber 1222c lags behind the pressure change in the first chamber 1222a (i.e., the change in P2 lags behind P1). The pressure difference between P1 and P2 drives the piston plate 123 to move rapidly, thereby driving the valve core plate 112 to move rapidly through the movable rod 121; that is, when P1 increases, the amount by which the movable rod 121 extends into the valve pipe 111 increases, and the valve core... When the opening of plate 112 decreases, P1 decreases, the movable rod 121 retracts to reduce the amount of extension into valve tube 111, and the opening of valve core plate 112 increases. The pressure difference (P3-P2) between the third chamber 1222c and the second chamber 1222b, along with the elastic element, work together to suppress over-adjustment and drive piston ring 124 to move in the opposite direction. When valve core plate 112 is momentarily closed, pressure P3 will decrease rapidly, causing the pressure difference P3-P2 to decrease, which in turn causes piston ring 124 to move toward piston plate 123, thereby driving movable rod 121 to retract and suppressing valve core plate 112 from continuing to close, ensuring that pressure P3 does not continue to decrease until a new equilibrium is established (during this process, the opening of valve core plate 112 changes in an oscillating state until it finally reaches stability).

[0047] like Figures 2-5 As shown, in this embodiment, both ends of the valve pipe 111 are provided with flange rings 1112, and the valve pipe 111 is connected to the gas transmission pipeline 2 through the flange rings 1112.

[0048] Example 2 like Figure 1 As shown, this embodiment provides a gas transmission pipeline assembly, including a gas transmission pipeline 2, a regulating valve 3, and a pneumatic hysteresis valve 1 as described in Embodiment 1. Both the pneumatic hysteresis valve 1 and the regulating valve 3 are connected to the gas transmission pipeline 2, with the pneumatic hysteresis valve 1 located upstream of the regulating valve 3. All three gas inlets are connected to the gas transmission pipeline 2. The first gas inlet 1221a is located upstream of the pneumatic hysteresis valve 1, the second gas inlet 1221b is located downstream of the regulating valve 3, and the third gas inlet 1221c is located between the pneumatic hysteresis valve 1 and the regulating valve 3 when the pressure at the gas inlet of the gas transmission pipeline 2 fluctuates. This allows the pneumatic hysteresis valve 1 to act as a buffer upstream of the regulating valve 3 when the pressure fluctuates at the inlet of the gas transmission pipeline 2, while also adaptively adjusting its opening to ensure a relatively stable output flow rate downstream of the gas transmission pipeline 2.

[0049] like Figure 1As shown, in this embodiment, the gas pipeline 2 is provided with three bypass ports, namely a first bypass port 21a, a second bypass port 21b, and a third bypass port 21c. The first bypass port 21a is located upstream of the regulating valve 3 and is connected to the first air inlet 1221a. The second bypass port 21b is located downstream of the regulating valve 3 and is connected to the second air inlet 1221b. The third bypass port 21c is located between the pneumatic hysteresis valve 1 and the regulating valve 3 and is connected to the third air inlet 1221c. This makes it more convenient to connect the three air inlets of the pneumatic actuator 12 to the gas pipeline 2.

[0050] In this embodiment, the regulating valve 3 can be a conventional ball valve or butterfly valve, which are existing technologies and will not be described in detail here. In this embodiment, the regulating valve 3 and the pneumatic hysteresis valve 1 are distributed at intervals on the gas transmission pipeline 2.

[0051] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pneumatic hysteresis valve, which is installed on a gas transmission pipeline (2) and located upstream of a regulating valve (3), characterized in that, The pneumatic hysteresis valve (1) includes a valve body (11) and a pneumatic actuator (12). The valve body (11) includes a valve tube (111) and a valve core plate (112) rotatably disposed in the valve tube (111). The valve tube (111) has an insertion hole (1111) on its side wall and is used to connect to the gas pipeline (2). The pneumatic actuator (12) is disposed outside the valve tube (111) and has a movable rod (121) and three air inlets. The movable rod (121) is sealed through the insertion hole (1111) and inserted into the valve tube (111), and is connected to the valve core plate (112) in a driving manner. The three air inlets are all used to communicate with the air supply pipe (2). The three air inlets are respectively the first air inlet (1221a), the second air inlet (1221a), the third air inlet (1221a), the fourth air inlet (1221a), the fifth air inlet (1221a), the sixth air inlet (1221a), the seventh air inlet (1221a), the eleventh ... 21b) and the third air inlet (1221c), the first air inlet (1221a) is connected to the air supply pipe (2) upstream of the pneumatic hysteresis valve (1), the second air inlet (1221b) is connected to the air supply pipe (2) downstream of the regulating valve (3), and the third air inlet (1221c) is connected to the air supply pipe (2) between the pneumatic hysteresis valve (1) and the regulating valve (3); When the regulating valve (3) is in the open state, if there is a fluctuation in the pressure at the inlet of the gas pipeline (2), the pneumatic actuator (12) is used to adjust the opening of the valve body (11) according to the change in the pressure difference at the three gas inlets, so as to maintain the flow rate of the airflow through the regulating valve (3) relatively stable.

2. The pneumatic hysteresis valve according to claim 1, characterized in that, The pneumatic actuator (12) further includes a housing (122), a piston plate (123), a piston ring (124), a limiting plate (125), and two elastic members. The housing (122) is hollow to form a piston chamber. The housing (122) is disposed outside the valve tube (111). The piston plate (123) and piston ring (124) are both slidably disposed in the piston chamber and divide the piston chamber into three chambers, which are, in order, the first chamber (1222a), the second chamber (1222a), the third chamber (1222a), the fourth chamber (1222a), the fifth chamber (1222a), the sixth chamber (1222a), the seventh chamber (1222a), the ninth chamber (1222a), the eleventh chamber (1 ... The valve tube has two chambers: a second chamber (1222b) and a third chamber (1222c). The piston ring (124) is located between the second chamber (1222b) and the third chamber (1222c). The limiting plate (125) is located inside the second chamber (1222b). The housing (122) has a through hole (1223) that communicates with the third chamber (1222c). The through hole (1223) is aligned with the inner hole of the piston ring (124). The movable rod (121) is located in the valve tube. One end of the piston ring (124) passes through the through hole (1223) and the inner hole of the piston ring (124) in a sealed sliding manner, and is perpendicularly connected to the limiting plate (125) in the second chamber (1222b). Each side of the limiting plate (125) is provided with an elastic element to connect with the corresponding piston plate (123) and piston ring (124). All three air inlets are located on the housing (122). The first air inlet (1221a) communicates with the first chamber (1222a). The second air inlet (1221b) is connected to the second chamber (1222b), and the third air inlet (1221c) is connected to the third chamber (1222c). The two elastic elements are the first elastic element (126a) and the second elastic element (126b). The first elastic element (126a) is disposed between the limiting plate (125) and the piston plate (123), and the second elastic element (126b) is disposed between the limiting plate (125) and the piston ring (124).

3. The pneumatic hysteresis valve according to claim 2, characterized in that, The first air inlet (1221a) and the third air inlet (1221c) are located at the two ends of the housing (122), and the second air inlet (1221b) is located in the middle of the housing (122) along its length.

4. The pneumatic hysteresis valve according to claim 3, characterized in that, A limiting ring (1224) is provided on the inner wall of the housing (122) at the middle of its length direction, and the second air inlet (1221b) is located on the limiting ring (1224).

5. The pneumatic hysteresis valve according to claim 2, characterized in that, The first elastic element (126a) includes a plurality of first springs (1261), which are evenly spaced in the circumferential direction between the limiting plate (125) and the piston plate (123); The second elastic element (126b) includes a second spring (1262) which is sleeved on the movable rod (121), or the second elastic element (126b) includes a plurality of second springs (1262) which are evenly spaced in the circumferential direction between the limiting plate (125) and the piston ring (124).

6. The pneumatic hysteresis valve according to claim 2, characterized in that, Both sides of the piston plate (123) and piston ring (124) are coated with fluororubber or silicone rubber.

7. The pneumatic hysteresis valve according to any one of claims 1-6, characterized in that, The valve core plate (112) is a circular plate that mates with the inner hole of the valve tube (111). A rotating shaft (1121) is radially arranged in the middle of the valve core plate (112). The rotating shaft (1121) is radially distributed inside the valve tube (111) and its two ends extend to be rotatably connected to the inner wall of the valve tube (111). The axial direction of the through hole (1111) is perpendicular to the rotating shaft (1121) and the two are offset along the axial direction of the valve tube (111). One end of the movable rod (121) located inside the valve tube (111) is connected to the corresponding side of the valve core plate (112) through a connecting piece (13). The movable rod (121) moves axially to drive the valve core plate (112) to rotate to open or close the valve tube (111).

8. The pneumatic hysteresis valve according to claim 7, characterized in that, The connector (13) includes a connecting rod (131) and two U-shaped hinge seats (132). One of the hinge seats (132) is located at one end of the movable rod (121) inside the valve tube (111), and the other hinge seat (132) is located in the middle of the valve core plate (112) and on the side of the rotating shaft (1121) away from the through hole (1111). The two ends of the connecting rod (131) are rotatably connected to the two hinge seats (132) respectively.

9. A gas pipeline assembly, characterized in that, The device includes a gas pipeline (2), a regulating valve (3), and a pneumatic hysteresis valve (1) as described in any one of claims 1-8. The pneumatic hysteresis valve (1) and the regulating valve (3) are both connected to the gas pipeline (2), and the pneumatic hysteresis valve (1) is located upstream of the regulating valve (3). All three gas inlets are connected to the gas pipeline (2). The first gas inlet (1221a) is connected to the gas pipeline (2) upstream of the pneumatic hysteresis valve (1), the second gas inlet (1221b) is connected to the gas pipeline (2) downstream of the regulating valve (3), and the third gas inlet (1221c) is connected to the gas pipeline (2) between the pneumatic hysteresis valve (1) and the regulating valve (3).

10. The gas pipeline assembly according to claim 9, characterized in that, The gas pipeline (2) is provided with three bypass ports, namely the first bypass port (21a), the second bypass port (21b) and the third bypass port (21c). The first bypass port (21a) is located upstream of the regulating valve (3) and is connected to the first gas inlet (1221a). The second bypass port (21b) is located downstream of the regulating valve (3) and is connected to the second gas inlet (1221b). The third bypass port (21c) is located between the pneumatic hysteresis valve (1) and the regulating valve (3) and is connected to the third gas inlet (1221c).

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