Pneumatic pressure controller for valves and pneumatic control valves

Abstract

The present invention provides a pneumatic pressure controller and a pneumatic control valve for a valve. The pneumatic pressure controller for the valve includes a control body, a pressure detection structure, and a pneumatic pressure adjustment structure. The control body has a gas passage, and the control body has a gas inlet, a first gas outlet, and a second gas outlet; the pneumatic pressure adjustment structure is arranged on the control body; the pressure detection structure is arranged on the control body and is used to be connected to a pipe fitting to detect the medium pressure in the pipe fitting; wherein, in a state where an air supply pump supplies gas to the gas inlet and the pressure detection structure is connected to the pipe fitting, the pressure detection structure drives the pneumatic pressure adjustment structure to move according to the change of the medium pressure in the pipe fitting detected by it, so as to open or close the first gas outlet. The pneumatic pressure controller for the valve provided by the present invention can drive the valve through a pneumatic actuator without program control, reducing the operation difficulty of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of regulating valves, and particularly relates to a pneumatic pressure controller for a valve and a pneumatic regulating valve. Background Art

[0002] A pneumatic regulating valve generally refers to a valve that uses compressed gas as a power source, a cylinder as an actuator, and drives the valve with the help of accessories such as a valve positioner, a converter, a solenoid valve, a holding valve, an air storage tank, and a gas filter to achieve on-off or proportional regulation, and receives a control signal from an industrial automation control system to complete the regulation of various process parameters such as the flow rate, pressure, temperature, and liquid level of the pipeline medium.

[0003] In the prior art, a valve positioner usually needs to be used in combination with a regulator, a proportional controller, a programmable logic controller, and a sensor to form a closed-loop circuit. Therefore, it is necessary to perform program control through programming to drive the valve with a pneumatic actuator, and the operation difficulty is relatively high. Summary of the Invention

[0004] The purpose of the present invention is to provide a pneumatic pressure controller for a valve and a pneumatic regulating valve, which can control the air pressure of the pneumatic actuator without program control to drive the valve and reduce the operation difficulty of the valve.

[0005] The above object of the present invention can be achieved by the following technical solutions:

[0006] The present invention provides a pneumatic pressure controller for a valve, including:

[0007] A control body having a gas passage, and the control body has a gas inlet, a first gas outlet, and a second gas outlet. The gas inlet, the first gas outlet, and the second gas outlet are connected through the gas passage. The gas inlet is used to connect to an air supply pump, and the second gas outlet is used to connect to a pneumatic actuator;

[0008] A pneumatic pressure adjustment structure disposed on the control body;

[0009] A pressure detection structure disposed on the control body and used to be connected to a pipe fitting to detect the medium pressure inside the pipe fitting;

[0010] Wherein, in the state where the air supply pump supplies gas to the gas inlet and the pressure detection structure is connected to the pipe fitting, the pressure detection structure drives the pneumatic pressure adjustment structure to move according to the change in the medium pressure inside the pipe fitting detected by it to open or close the first gas outlet.

[0011] According to an embodiment of the present invention, the pressure detection structure includes:

[0012] A pressure-taking body has a pressure-taking inner cavity. The upper end of the pressure-taking body has a driving installation port, and the lower end of the pressure-taking body has a pressure-taking port. The upper end of the pressure-taking body is connected to the bottom of the control body;

[0013] A driving component is connected to the pressure-taking body;

[0014] Wherein, in a state where the pressure detection structure detects that the medium pressure in the pipe fitting is greater than a preset value, the driving component moves upward from the pressure-taking inner cavity through the driving installation port to push the air pressure adjustment structure upward to close the first gas outlet.

[0015] According to an embodiment of the present invention, in a state where the pressure detection structure detects that the medium pressure in the pipe fitting is less than a preset value, the driving component moves downward to drive the air pressure adjustment structure downward to open the first gas outlet.

[0016] According to an embodiment of the present invention, the air pressure adjustment structure includes:

[0017] An adjustment body is provided with a first stepped hole and a second stepped hole with diameters decreasing in sequence from top to bottom;

[0018] A pressure adjustment component includes an adjustment rod, a pressure elastic member, and an adjustment nut. The adjustment rod passes through the control body through the first stepped hole and the second stepped hole. The pressure elastic member and the adjustment nut are sleeved on the adjustment rod in sequence from top to bottom. The lower end of the pressure elastic member abuts against the shoulder of the bottom of the first stepped hole. There is a distance between the upper end and the lower end of the pressure elastic member. The adjustment nut is used to adjust the distance so that the lower end of the pressure elastic member presses down on the adjustment body;

[0019] An air port opening and closing component is arranged on the upper side of the control body. The gas channel includes a first channel and a second channel, and the first channel and the second channel are connected. The gas inlet, the second gas outlet, and the first channel are arranged on the control body, and the second channel and the first gas outlet are arranged on the air port opening and closing component;

[0020] Wherein, in a state where the pressure detection structure detects that the medium pressure in the pipe fitting is greater than a preset value, the driving component extends upward into the control body from the pressure-taking inner cavity through the driving installation port to push the adjustment body upward to abut against the air port opening and closing component to close the first gas outlet; in a state where the pressure detection structure detects that the medium pressure in the pipe fitting is less than a preset value, the driving component moves downward to drive the adjustment body downward to separate from the air port opening and closing component to open the first gas outlet.

[0021] According to an embodiment of the present invention, the air port opening and closing component includes:

[0022] The connecting seat is arranged on the upper side of the control main body. The connecting seat is provided with an adjusting body insertion hole extending along the length direction of the pneumatic pressure controller for the valve. The right part of the adjusting body extends into the adjusting body insertion hole. The second channel and the first gas outlet are arranged on the connecting seat.

[0023] The nozzle is arranged on the connecting seat and is located above the right part of the adjusting body. The nozzle is provided with a spray hole running through it. The nozzle is located above the right part of the adjusting body and is connected to the connecting seat. The first gas outlet is communicated with the spray hole.

[0024] Wherein, in the state where the medium pressure in the pipe fitting detected by the pressure detection structure is greater than the preset value, the driving component extends upward into the control main body through the driving mounting port along the pressure taking inner cavity to push the adjusting body upward to abut against the nozzle to close the spray hole; in the state where the medium pressure in the pipe fitting detected by the pressure detection structure is less than the preset value, the driving component moves downward to drive the adjusting body to move downward and separate from the nozzle to open the spray hole.

[0025] According to an embodiment of the present invention, it further includes a pre-tightening force adjusting structure. The adjusting body is provided with a pre-tightening force adjusting screw hole along the height direction of the control main body. The pre-tightening force adjusting screw hole is arranged in the middle of the adjusting body. The outer peripheral wall of the pre-tightening force adjusting structure is provided with a thread section matching the pre-tightening force adjusting screw hole. The pre-tightening force adjusting structure extends into the control main body through the pre-tightening force adjusting screw hole, and the lower end of the pre-tightening force adjusting structure abuts against the top of the driving component.

[0026] According to an embodiment of the present invention, the pressure adjusting component further includes a thrust bearing clamped between the pressure elastic member and the adjusting nut.

[0027] According to an embodiment of the present invention, it further includes a feedback structure located between the control main body and the air pressure adjusting structure and connected to the control main body and the air pressure adjusting structure respectively. The feedback structure is used to slow down the speed at which the pressure detection structure blocks the first gas outlet and the speed at which the pressure detection structure opens the first gas outlet.

[0028] According to an embodiment of the present invention, the feedback structure includes:

[0029] A rotating member rotatably penetrating through the control main body;

[0030] A valve stem feedback member located at the rear side of the control main body. The valve stem feedback member includes a first end and a second end. The first end of the valve stem feedback member is used to be connected to the valve stem, and the second end of the valve stem feedback member is connected to the rear end of the rotating member;

[0031] A feedback plate arranged at the front end of the rotating member;

[0032] The feedback rod is located on the front side of the control body. A deep groove ball bearing is provided on the rear side of the feedback rod. The middle part of the feedback rod is rotatably connected to the front end of the feedback plate through the deep groove ball bearing;

[0033] The connecting rod is arranged on the front side of the control body, and the connecting rod is rotatably connected to the right end of the feedback rod;

[0034] The feedback elastic member is clamped between the pneumatic pressure adjustment structure and the feedback rod;

[0035] Among them, in the state where the valve stem feedback member is connected to the valve stem, when the valve stem moves downward, the valve stem drives the valve stem feedback member to move downward, causing the rotating member to rotate counterclockwise, so as to drive the left end of the feedback rod to move upward, stretching the feedback elastic member upward; when the valve stem moves upward, the valve stem drives the valve stem feedback member to move upward, causing the rotating member to rotate clockwise, so as to drive the left end of the feedback rod to move downward, stretching the feedback elastic member downward.

[0036] The present invention also provides a pneumatic control valve, including:

[0037] The pneumatic pressure controller for the valve as described above;

[0038] The pneumatic actuator is communicated with the second gas outlet, and the pneumatic pressure controller for the valve is used to control the air pressure of the pneumatic actuator;

[0039] The air supply pump is communicated with the gas inlet;

[0040] The valve body has a valve stem, and the pneumatic actuator is connected to the valve stem to drive the valve stem to move.

[0041] The characteristics and advantages of the pneumatic pressure controller for the valve and the pneumatic control valve of the present invention are:

[0042] The pneumatic pressure controller for the valve of the present invention is used to adjust the air pressure of the pneumatic actuator. The pressure detection structure is used to be connected to the pipe fitting to detect the medium pressure in the pipe fitting. In the state where the air supply pump supplies gas to the gas inlet and the pressure detection structure is connected to the pipe fitting, the pressure detection structure drives the pneumatic pressure adjustment structure to move according to the detected change in the medium pressure in the pipe fitting, so as to open or close the first gas outlet. Thus, the air pressure of the pneumatic actuator can be adjusted without programming for program control, and the operation is simple. Brief Description of the Drawings

[0043] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present invention will become more obvious.

[0044] Figure 1 It is a three-dimensional schematic diagram of the pneumatic pressure controller for the valve of the present invention;

[0045] Figure 2Another three-dimensional schematic diagram of the pneumatic pressure controller for the valve of the present invention;

[0046] Figure 3 Exploded view of the pneumatic pressure controller for the valve of the present invention;

[0047] Figure 4 Front view schematic diagram of the control body in the present invention;

[0048] Figure 5 is Figure 4 Cross-sectional view along the A-A direction in

[0049] Figure 6 Exploded view of the pressure detection structure in the present invention;

[0050] Figure 7 Bottom view schematic diagram of the pressure detection structure in the present invention;

[0051] Figure 8 is Figure 7 Cross-sectional view along the B-B direction in

[0052] Figure 9 Partial cross-sectional view of the adjustment body in the present invention;

[0053] Figure 10 Cross-sectional view of the pressure regulating component along the height direction of the pneumatic pressure controller for the valve in the present invention;

[0054] Figure 11 Top view schematic diagram of the air port opening and closing component in the present invention;

[0055] Figure 12 is Figure 11 Cross-sectional view along the C-C direction in

[0056] Reference numerals and descriptions:

[0057] 1. Control body; 11. Gas passage; 111. First passage; 112. Second passage; 12. Gas inlet; 13. First gas outlet; 14. Second gas outlet; 15. Positioning and mating part;

[0058] 2. Pressure detection structure; 21. Pressure-taking body; 211. Pressure-taking inner cavity; 212. First end; 2121. Pressure-taking port; 213. Second end; 2131. Driving installation port; 214. Detection hole; 215. Pressure relief hole; 22. Driving component; 221. Connecting piece; 2211. Shaft hole; 222. Moving part; 223. Bellows; 23. Pressure relief screw;

[0059] 3. Pneumatic pressure adjustment structure; 31. Adjustment body; 311. First stepped hole; 312. Second stepped hole; 313. Positioning part; 314. Hole for the adjustment body to extend into; 315. Pre-tightening force adjustment screw hole; 316. Constant throttle part; 3161. Throttle hole; 317. Throttle valve core; 318. Nozzle baffle; 32. Pressure adjustment component; 321. Adjusting rod; 322. Pressure elastic part; 323. Adjusting nut; 324. Thrust bearing; 33. Air port opening and closing component; 331. Connecting seat; 3301. Upper connecting block; 3302. Lower connecting block; 332. Nozzle; 3321. Spray hole; 333. Sealing ring;

[0060] 4. Pre-tightening force adjustment structure;

[0061] 5. Feedback structure; 51. Rotating part; 511. First card slot; 512. Second card slot; 52. Valve stem feedback part; 521. First end; 522. Second end; 53. Feedback plate; 54. Feedback rod; 541. Deep groove ball bearing; 55. Connecting rod; 56. Feedback elastic part; 57. First snap ring; 58. Second snap ring;

[0062] α. Included angle;

[0063] L. Length direction of the pneumatic pressure controller for valves;

[0064] W. Width direction of the pneumatic pressure controller for valves;

[0065] H. Height direction of the pneumatic pressure controller for valves. Detailed implementation manners

[0066] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0067] The terms "a", "an", "the", and "said" are used to denote the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.

[0068] Embodiment 1

[0069] As Figures 1 to 12As shown in the figure, the present invention provides a pneumatic pressure controller for a valve, which includes a control body 1, a pneumatic pressure adjustment structure 3, and a pressure detection structure 2. The control body 1 has a gas passage 11, and the control body 1 has a gas inlet 12, a first gas outlet 13, and a second gas outlet 14. The gas inlet 12, the first gas outlet 13, and the second gas outlet 14 are connected through the gas passage 11. The gas inlet 12 is used to connect to a gas supply pump, and the second gas outlet 14 is used to connect to a pneumatic actuator; the pneumatic pressure adjustment structure 3 is arranged on the control body 1; the pressure detection structure 2 is arranged on the control body 1 and is used to be connected to a pipe fitting to detect the medium pressure in the pipe fitting; wherein, in the state where the gas supply pump supplies gas to the gas inlet 12 and the pressure detection structure 2 is connected to the pipe fitting, the pressure detection structure 2 drives the pneumatic pressure adjustment structure 3 to move according to the change of the medium pressure in the pipe fitting detected by it, so as to open or close the first gas outlet 13.

[0070] As Figures 1 to 5 and Figure 12 As shown in the figure, the pneumatic pressure controller for a valve of the present invention is used to adjust the air pressure of a pneumatic actuator. The pressure detection structure 2 is used to be connected to a pipe fitting to detect the medium pressure in the pipe fitting. In the state where the gas supply pump supplies gas to the gas inlet 12 and the pressure detection structure 2 is connected to the pipe fitting, the pressure detection structure 2 drives the pneumatic pressure adjustment structure 3 to move according to the change of the medium pressure in the pipe fitting detected by it, so as to open or close the first gas outlet 13. Thus, the air pressure of the pneumatic actuator can be adjusted without programming for program control, and the operation is simple.

[0071] That is to say, after the gas supplied by the gas supply pump enters the control body 1 through the gas inlet 12, it is divided into two paths by the gas passage 11. One path flows out from the first gas outlet 13, and the other path flows out from the second gas outlet 14. Therefore, when the first gas outlet 13 is blocked / closed, the gas pressure at the second gas outlet 14 can be increased; when the first gas outlet 13 is opened, the gas pressure at the second gas outlet 14 can be reduced. Thus, the air pressure of the pneumatic actuator can be adjusted, and the pressure detection structure 2 can perform real-time adjustment of the valve opening according to the detected medium pressure in the pipe fitting.

[0072] Furthermore, as Figures 1 to 5 and Figure 12As shown, the pressure detection structure 2 includes a pressure taking body 21 and a driving component 22. The pressure taking body 21 has a pressure taking inner cavity 211, the upper end of the pressure taking body 21 has a driving installation port 2131, the lower end of the pressure taking body 21 has a pressure taking port 2121, and the upper end of the pressure taking body 21 is connected to the bottom of the control main body 1; the driving component 22 is connected to the pressure taking body 21; wherein, when the pressure detection structure 2 detects that the medium pressure in the pipe fitting is greater than the preset value, the driving component 22 moves upward through the driving installation port 2131 from the pressure taking inner cavity 211 to push the air pressure adjustment structure 3 upward to close the first gas outlet 13. In one embodiment, the device main body also has an external thread section to facilitate screwing with the bracket of the pneumatic actuator.

[0073] Furthermore, when the pressure detection structure 2 detects that the medium pressure in the pipe fitting is less than the preset value, the driving component 22 moves downward to drive the air pressure adjustment structure 3 downward to open the first gas outlet 13.

[0074] In this embodiment, as Figure 3 、 Figure 6 、 Figure 7 and Figure 8 shown, the pressure taking body 21 can be screwed on the lower side of the control main body 1; the driving component 22 may include a connecting piece 221, a moving piece 222 and a corrugated pipe 223. The connecting piece 221 is hermetically connected to the pressure taking body 21 through a gasket arranged at the upper end of the pressure taking body 21, and the connecting piece 221 is provided with an axial hole 2211 up and down; the moving piece 222 extends upward from the pressure taking inner cavity 211 through the axial hole 2211, and the moving piece 222 can move up and down; the corrugated pipe 223 is located between the connecting piece 221 and the moving piece 222 and is sleeved on the moving piece 222. A detection hole 214 is also provided at the second end 213 of the pressure taking body 21, and the detection hole 214 is used to detect whether the medium in the pipe fitting leaks from the driving installation port 2131. A pressure relief hole 215 communicated with the pressure taking inner cavity 211 is also provided on the outer peripheral wall of the pressure taking body 21, and a pressure relief screw 23 is hermetically penetrated through the pressure relief hole 215 for relieving pressure on the pressure taking body 21 in case of a failure.

[0075] Specifically, as Figure 3 、 Figure 9 and Figure 10, the air pressure adjustment structure 3 includes an adjustment body 31, a pressure adjustment component 32, and an air port opening and closing component 33. The adjustment body 31 is provided with a first stepped hole 311 and a second stepped hole 312 with diameters decreasing sequentially from top to bottom; the pressure adjustment component 32 includes an adjustment rod 321, a pressure elastic member 322, and an adjustment nut 323. The adjustment rod 321 passes through the control body 1 through the first stepped hole 311 and the second stepped hole 312; the pressure elastic member 322 can be a spring. The pressure elastic member 322 and the adjustment nut 323 are sleeved on the adjustment rod 321 in sequence from top to bottom. The lower end of the pressure elastic member 322 abuts against the shoulder at the bottom of the first stepped hole 311. There is a spacing between the upper end and the lower end of the pressure elastic member 322. The adjustment nut 323 is used to adjust the spacing so that the lower end of the pressure elastic member 322 presses down on the adjustment body 31, so as to adjust the pressure of the adjustment body 31 pressing on the upper end of the driving component 22. The above adjustment can be completed through mechanical operations such as rotating the adjustment nut 323, and the corresponding setting of the pipe fitting medium pressure can be realized without program control. The operation is simple and convenient.

[0076] It can be understood that the adjustment body 31 is equivalent to a cantilever beam, the connection between the adjustment rod 321 and the control body 1 is a fixed support, and the right part of the adjustment body 31 is a free end.

[0077] In the present invention, as Figures 1 to 3 and as Figure 10 shown, the pressure adjustment component 32 further includes a thrust bearing 324, which is clamped between the pressure elastic member 322 and the adjustment nut 323. Through the above structural setting, it is convenient for the adjustment nut 323 to rotate relative to the pressure elastic member 322, which can save the operation force and reduce the difficulty of rotating the adjustment nut 323.

[0078] Furthermore, as Figure 11 and Figure 12 shown, the air port opening and closing component 33 is arranged on the upper side of the control body 1. The gas channel 11 includes a first channel 111 and a second channel 112, and the first channel 111 and the second channel 112 are connected. The gas inlet 12, the second gas outlet 14, and the first channel 111 are arranged on the control body 1, and the second channel 112 and the first gas outlet 13 are arranged on the air port opening and closing component 33; wherein, in a state where the medium pressure in the pipe fitting detected by the pressure detection structure 2 is greater than the preset value, the driving component 22 extends upward into the control body 1 through the pressure taking inner cavity 211 and the driving installation port 2131 to push the adjustment body 31 upward to abut against the air port opening and closing component 33 to close the first gas outlet 13; in a state where the medium pressure in the pipe fitting detected by the pressure detection structure 2 is less than the preset value, the driving component 22 moves downward to drive the adjustment body 31 to move downward and separate from the air port opening and closing component 33 to open the first gas outlet 13.

[0079] In the present invention, as Figure 1 , Figure 11 and Figure 12 shown, the air port opening and closing member 33 includes a connecting seat 331 and a nozzle 332. The connecting seat 331 is disposed on the upper side of the control body 1, and the connecting seat 331 is provided with an adjustment body insertion hole 314 extending along the length direction L of the pneumatic pressure controller for valves. The right part of the adjustment body 31 extends into the adjustment body insertion hole 314. The second channel 112 and the first gas outlet 13 are disposed on the connecting seat 331; the nozzle 332 is disposed on the connecting seat 331 and is located above the right part of the adjustment body 31. The nozzle 332 is provided with a spray hole 3321 penetrating therethrough. The nozzle 332 is located above the right part of the adjustment body 31 and is connected to the connecting seat 331. The first gas outlet 13 is communicated with the spray hole 3321; wherein, in a state where the medium pressure in the pipe fitting detected by the pressure detection structure 2 is greater than a preset value, the driving member 22 extends upward into the control body 1 through the pressure taking inner cavity 211 via the driving mounting port 2131 to push the adjustment body 31 upward to abut against the nozzle 332 to close the spray hole 3321; in a state where the medium pressure in the pipe fitting detected by the pressure detection structure 2 is less than the preset value, the driving member 22 moves downward to drive the adjustment body 31 to move downward and separate from the nozzle 332 to open the spray hole 3321. Wherein, a nozzle baffle 318 may be further provided at the upper end of the right part of the adjustment body 31. The right part of the adjustment body 31 abuts against the air port opening and closing member 33 through the nozzle baffle 318 to block the first gas outlet 13.

[0080] In one embodiment, as Figure 1 , Figure 11 and Figure 12 shown, the connecting seat 331 includes an upper connecting block 3301 and a lower connecting block 3302 connected up and down. The nozzle 332 is hermetically clamped between the upper connecting block 3301 and the lower connecting block 3302. Wherein, as Figure 12 shown, the sealing between the nozzle 332 and the connecting seat 331 can be achieved through an O-ring 333. With the above structure, it is convenient to install the nozzle 332.

[0081] In one embodiment of the present invention, Figures 1 to 3 and Figure 9As shown, it further includes a pre-tightening force adjusting structure 4. The adjusting body 31 is provided with a pre-tightening force adjusting screw hole 315 along the height direction H of the control body 1. The pre-tightening force adjusting screw hole 315 is arranged in the middle of the adjusting body 31. A threaded section matching the pre-tightening force adjusting screw hole 315 is provided on the outer peripheral wall of the pre-tightening force adjusting structure 4. The pre-tightening force adjusting structure 4 extends into the control body 1 through the pre-tightening force adjusting screw hole 315, and the lower end of the pre-tightening force adjusting structure 4 abuts against the top of the driving component 22. Rotating the pre-tightening force adjusting structure 4 enables it to move up and down, and the pressure pressing on the upper end of the driving component 22 can be adjusted. Thus, the pre-tightening force of the driving component 22 (bellows 223) is adjusted to adjust the preset value.

[0082] In a state where the medium pressure in the pipe fitting detected by the pressure detection structure 2 is greater than the preset value, the driving component 22 extends upward into the control body 1 along the pressure taking inner cavity 211 through the driving installation port 2131 to jack up the lower end of the pre-tightening force adjusting structure 4, so that the adjusting body 31 can move upward and abut against the nozzle 332 through its right part to close the spray hole 3321; in a state where the medium pressure in the pipe fitting detected by the pressure detection structure 2 is less than the preset value, the driving component 22 moves downward to drive the adjusting body 31 to move downward and separate from the nozzle 332 to open the spray hole 3321.

[0083] In one embodiment, Figures 1 to 3 and Figure 9 As shown, the bottom of the adjusting body 31 has a plurality of positioning members 313 (or can be called support points). The plurality of positioning members 313 are arranged at intervals along the width direction W of the pneumatic pressure controller for valves, and the positioning members 313 abut against the upper side of the control body 1. By providing the positioning members 313, it is used for positioning the adjusting body 31. In this embodiment, the outer diameter of the positioning member 313 is gradually reduced from top to bottom. The upper side of the device body 1 has a plurality of positioning and mating members 15 corresponding to the positioning members 313. The upper end of the positioning and mating member 15 is provided with a V-shaped groove along the width direction W of the pneumatic pressure controller for valves, and the lower end of the positioning member 313 abuts against the V-shaped groove.

[0084] In one embodiment of the present invention, as Figure 2 、 Figure 4 and Figure 5As shown, the control body 1 further has a constant throttle member 316 (or throttle orifice 3161), which is located at the connection between the gas inlet 12 and the gas passage 11 and is connected to the control body 1. The constant throttle member 316 is used to control the pressure of the gas flowing from the gas inlet 12 into the gas passage 11. Among them, a throttle orifice 3161 is provided on the constant throttle member 316, and the aperture of the throttle orifice 3161 is between 0.16 mm and 0.4 mm. The control body 1 further has a throttle valve spool 317, which is located at the connection between the gas passage 11 and the second gas outlet 14 and is connected to the control body 1. The throttle valve spool 317 is used to control the pressure of the gas flowing from the gas passage 11 to the second gas outlet 14, so as to adjust the opening and closing speed of the pneumatic actuator and control the gas speed at the second gas outlet 14.

[0085] Further, as Figures 1 to 3 shown, it further includes a feedback structure 5, which is located between the control body 1 and the air pressure adjustment structure 3 and is respectively connected to the control body 1 and the air pressure adjustment structure 3. The feedback structure 5 is used to slow down the speed at which the pressure detection structure 2 blocks the first gas outlet 13 and the speed at which the pressure detection structure 2 opens the first gas outlet 13.

[0086] Even further, as Figures 1 to 3 shown, the feedback structure 5 includes a rotating member 51, a valve stem feedback member 52, a feedback plate 53, a feedback rod 54, a connecting rod 55, and a feedback elastic member 56. The rotating member 51 rotatably penetrates through the control body 1. The valve stem feedback member 52 is located at the rear side of the control body 1. The valve stem feedback member 52 includes a first end 521 and a second end 522. The first end 521 of the valve stem feedback member 52 is used to be connected to the valve stem, and the second end 522 of the valve stem feedback member 52 is connected to the rear end of the rotating member 51. The feedback plate 53 is arranged at the front end of the rotating member 51. The feedback rod 54 is located at the front side of the control body 1. A deep groove ball bearing 541 is provided on the rear side of the feedback rod 54. The middle part of the feedback rod 54 is rotatably connected to the front end of the feedback plate 53 through the deep groove ball bearing 541. The connecting rod 55 is arranged at the front side of the control body 1, and the connecting rod 55 is rotatably connected to the right end of the feedback rod 54. The feedback elastic member 56 is clamped between the air pressure adjustment structure 3 and the feedback rod 54. Among them, in the state where the valve stem feedback member 52 is connected to the valve stem, when the valve stem moves downward, the valve stem drives the valve stem feedback member 52 to move downward, causing the rotating member 51 to rotate counterclockwise, so as to drive the left end of the feedback rod 54 to move upward, stretching the feedback elastic member 56 upward. When the valve stem moves upward, the valve stem drives the valve stem feedback member 52 to move upward, causing the rotating member 51 to rotate clockwise, so as to drive the left end of the feedback rod 54 to move downward, stretching the feedback elastic member 56 downward.

[0087] Specifically, as Figures 1 to 3As shown, on the outer peripheral wall of the transmission part, a first clamping groove 511 and a second clamping groove 512 are provided at intervals along the width direction W of the pneumatic pressure controller for the valve. A first clamping ring 57 is sleeved on the first clamping groove 511. The rear side of the first clamping ring 57 has a first abutting surface, and the first abutting surface abuts against the front side of the control body 1; a second clamping ring 58 is sleeved on the second clamping groove 512. The front side of the second clamping ring 58 has a second abutting surface, and the second abutting surface abuts against the rear side of the control body 1 to prevent the valve stem feedback part 52 from shaking.

[0088] In specific applications, as Figures 1 to 3 and Figures 5 to 8 shown, when the air supply pump supplies gas to the gas inlet 12, the pressure detection structure 2 is connected to the pipe fitting, and the pressure detection structure 2 detects that the medium pressure in the pipe fitting is greater than the preset value, the driving component 22 extends upward into the control body 1 along the pressure taking inner cavity 211 through the driving mounting port 2131 to push the adjustment body 31 upward to abut against the nozzle 332 to block the spray hole 3321, increasing the air pressure at the second gas outlet 14. Thus, the air pressure of the pneumatic actuator is increased, causing the valve stem to move upward and increasing the opening degree of the valve. When the valve stem moves upward, it can drive the valve stem feedback part 52 to move upward, the rotating part 51 rotates clockwise, and the rotating part 51 makes the feedback rod 54 rotate counterclockwise through the deep groove ball bearing 541 connected to the feedback plate 53, enabling the feedback elastic part 56 to move downward close to the adjustment body 31 to slow down the upward movement of the adjustment body 31 and slow down the speed at which the pressure detection structure 2 blocks the first gas outlet 13; when the air supply pump supplies gas to the gas inlet 12, the pressure detection structure 2 is connected to the pipe fitting, and the pressure detection structure 2 detects that the medium pressure in the pipe fitting is less than the preset value, the driving component 22 can move the adjustment body 31 downward to drive the adjustment body 31 to move downward and separate from the nozzle 332 to open the spray hole 3321, reducing the air pressure at the second gas outlet 14. Thus, the air pressure of the pneumatic actuator is reduced, causing the valve stem to move downward and reducing the opening degree of the valve. When the valve stem moves downward, it can drive the valve stem feedback part 52 to move downward, the rotating part 51 rotates counterclockwise, and the rotating part 51 makes the swinging part rotate clockwise through the deep groove ball bearing 541 connected to the feedback plate 53, enabling the feedback elastic part 56 to provide an upward pulling force to the adjustment body 31 to slow down the downward movement of the adjustment body 31 and slow down the speed at which the pressure detection structure 2 opens the first gas outlet 13. The valve position signal is feedback through the feedback structure 5 to act on the control body 1 through the feedback elastic part 56.

[0089] Principle description:

[0090] The acting force of the air pressure adjustment structure 3 (or can be called the balancing part) includes: the acting force of the driving component 22, denoted as F b ; the acting force of the nozzle 332, denoted as F p; The acting force of the pressure elastic member 322 is denoted as F y ; The acting force of the medium is denoted as F j ; The acting force of the feedback elastic member 56 is denoted as F l .

[0091] The torque centered on the positioning member 313 includes: the torque of the driving member 22, denoted as M b ; The torque of the nozzle 332, denoted as M p ; The torque of the pressure elastic member 322, denoted as M y ; The torque of the medium, denoted as M j ; The torque of the feedback elastic member 56, denoted as M l .

[0092] The balance formula for any opening of the valve without the feedback elastic member 56: M b +M j -M p -M y =0, then M j =M p +M y -M b , M p 、M y and M b can all be set values, that is, fixed values. Theoretically, when the medium pressure increases (i.e., M j increases), the valve position will always tend to open. In actual use, when the medium pressure increases (i.e., M j increases), the valve opens rapidly, which will cause the medium pressure to decrease rapidly (i.e., M j decreases rapidly). When the medium pressure decreases rapidly, the valve will close rapidly. Since the pipe pressure is usually in a fluctuating state, this will cause the valve to be in a state of large-scale opening and closing for a long time, seriously affecting the service life of the valve.

[0093] The balance formula for any opening of the valve with the feedback elastic member 56: M b +M j +M l -M p -M y =0, then M j =M p +M y -M b -M l . M l varies with the valve opening, that is, there is a corresponding M l for each valve opening. When the valve opening increases, M j decreases, then the corresponding M l increases; when the valve opening decreases, M j increases; when the valve opening decreases, M lincreases, corresponding to M j decreases. M j There is a change amount corresponding to the full stroke of the valve, and the change amount can be designed (the feedback elastic member 56 can be designed according to the actual working condition pressure fluctuation).

[0094] Theoretically, when the medium pressure fluctuates (i.e., M j when there is a slight fluctuation), the valve position only has a small change. In actual use, when the medium pressure fluctuation state increases (i.e., M j a small increase), the valve position of the valve will open slightly, which will cause the medium pressure to decrease slightly (i.e., M j a small decrease). When the medium pressure decreases slightly, the valve will open slightly again. Since the medium pressure in the pipe fittings is usually in a state of rapid and extremely small fluctuations, the valve position can basically remain unchanged when the pressure fluctuates slightly, so as to increase the durability of the valve.

[0095] It can be seen from the above technical solutions that the present invention has at least the following effects:

[0096] 1. Since the present invention adopts the pressure detection structure 2, which is connected to the pipe fittings of the medium to be adjusted, the medium pressure directly acts on the driving component 22 in the pressure detection structure 2, and then is converted into a thrust acting on the air pressure adjustment structure 3. It reduces traditional electrical components such as pressure sensors and controllers (PLC or DCS), and does not need to rely on programming of programmable logic controllers, etc. The transmission of the medium pressure signal can be realized only through the pressure detection structure 2, saving the cost of multiple electrical control components and having a simple operation.

[0097] 2. Since the present invention adopts the air pressure adjustment structure 3, by rotating the adjusting nut 323 of the pressure adjusting component 32, the setting of the medium pressure can be realized, with a simple operation. There is no need to worry about problems such as the inability to set the pressure caused by the power failure of the traditional control system, which is safe and reliable.

[0098] 3. Since the present invention can integrate and assemble all components on the control main body 1, its external dimensions and weight are the same as those of the positioner, and the installation method is also the same as that of the existing positioner. Moreover, it can be perfectly connected to the existing pneumatic actuator (pneumatic actuator mechanism). While having a small size and light weight, the installation is also relatively simple.

[0099] 4. Since the present invention adopts a pneumatic control system, it does not need to be powered, and directly converts the pipe fitting pressure ratio into air pressure and outputs it to the pneumatic actuator. There is no need to worry about problems such as control anomalies caused by the power failure of the traditional control system, and it is especially suitable for various explosion-proof occasions, which is safe and reliable.

[0100] Embodiment 2

[0101] The present invention also provides a pneumatic control valve, which includes the pneumatic pressure controller for the valve in Embodiment 1, a pneumatic actuator, an air supply pump, and a valve body. The pneumatic actuator is communicated with the second gas outlet 14, and the pneumatic pressure controller for the valve is used to control the air pressure of the pneumatic actuator; the air supply pump is communicated with the gas inlet 12; the valve body has a valve stem, and the pneumatic actuator is connected to the valve stem to drive the valve stem to move. The specific structure, working principle, and beneficial effects of the pneumatic pressure controller for the valve are the same as those in Embodiment 1, and will not be described in detail here.

[0102] Wherein, when the valve stem moves upward, the valve opening increases; when the valve stem moves downward, the valve opening decreases.

[0103] In the embodiments of the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0104] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the embodiments of the present invention.

[0105] In the description of this specification, the description of terms such as "one embodiment" and "one preferred embodiment" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0106] The above are only the preferred embodiments of the embodiments of the present invention, and are not used to limit the embodiments of the present invention. For those skilled in the art, the embodiments of the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A pneumatic pressure controller for a valve, characterized in that, it includes: A control body (1) having a gas passage (11), and the control body (1) has a gas inlet (12), a first gas outlet (13) and a second gas outlet (14). The gas inlet (12), the first gas outlet (13) and the second gas outlet (14) are connected through the gas passage (11). The gas inlet (12) is used to connect to a gas supply pump, and the second gas outlet (14) is used to connect to a pneumatic actuator; A pneumatic pressure adjustment structure (3) provided on the control body (1); A pressure detection structure (2) provided on the control body (1) and used to be connected to a pipe fitting to detect the medium pressure in the pipe fitting; Wherein, in the state where the gas supply pump supplies gas to the gas inlet (12) and the pressure detection structure (2) is connected to the pipe fitting, the pressure detection structure (2) drives the pneumatic pressure adjustment structure (3) to move according to the change in the medium pressure in the pipe fitting it detects, so as to open or close the first gas outlet (13); The pressure detection structure (2) includes: A pressure taking body (21) having a pressure taking inner cavity (211), and the upper end of the pressure taking body (21) has a driving installation port (2131), the lower end of the pressure taking body (21) has a pressure taking port (2121), and the upper end of the pressure taking body (21) is connected to the bottom of the control body (1); A driving component (22) connected to the pressure taking body (21); Wherein, in the state where the pressure detection structure (2) detects that the medium pressure in the pipe fitting is greater than a preset value, the driving component (22) moves upward from the pressure taking inner cavity (211) through the driving installation port (2131) to push the pneumatic pressure adjustment structure (3) upward to close the first gas outlet (13).

2. The pneumatic pressure controller for a valve according to claim 1, characterized in that, in the state where the pressure detection structure (2) detects that the medium pressure in the pipe fitting is less than the preset value, the driving component (22) moves downward to drive the pneumatic pressure adjustment structure (3) to move downward to open the first gas outlet (13).

3. The pneumatic pressure controller for a valve according to claim 2, characterized in that, the pneumatic pressure adjustment structure (3) includes: An adjustment body (31) provided with a first stepped hole (311) and a second stepped hole (312) whose apertures decrease in sequence from top to bottom; The pressure regulating component (32) includes an adjusting rod (321), a pressure elastic member (322), and an adjusting nut (323). The adjusting rod (321) passes through the control body (1) through the first stepped hole (311) and the second stepped hole (312). The pressure elastic member (322) and the adjusting nut (323) are sequentially sleeved on the adjusting rod (321) from top to bottom. The lower end of the pressure elastic member (322) abuts against the shoulder of the bottom of the first stepped hole (311). There is a spacing between the upper end and the lower end of the pressure elastic member (322). The adjusting nut (323) is used to adjust the spacing so that the lower end of the pressure elastic member (322) presses down the adjustment body (31). The air port opening and closing component (33) is arranged on the upper side of the control body (1). The gas passage (11) includes a first passage (111) and a second passage (112). The first passage (111) and the second passage (112) are connected. The gas inlet (12), the second gas outlet (14), and the first passage (111) are arranged on the control body (1). The second passage (112) and the first gas outlet (13) are arranged on the air port opening and closing component (33). Wherein, in a state where the medium pressure in the pipe fitting detected by the pressure detection structure (2) is greater than the preset value, the driving component (22) extends upward into the control body (1) along the pressure taking inner cavity (211) through the driving installation port (2131) to push the adjustment body (31) upward to abut against the air port opening and closing component (33) to close the first gas outlet (13). In a state where the medium pressure in the pipe fitting detected by the pressure detection structure (2) is less than the preset value, the driving component (22) moves downward to drive the adjustment body (31) to move downward and separate from the air port opening and closing component (33) to open the first gas outlet (13).

4. The pneumatic pressure controller for a valve according to claim 3, characterized in that the air port opening and closing component (33) includes: a connecting seat (331) arranged on the upper side of the control body (1). The connecting seat (331) is provided with an adjustment body insertion hole (314) extending along the length direction of the pneumatic pressure controller for the valve. The right part of the adjustment body (31) extends into the adjustment body insertion hole (314). The second passage (112) and the first gas outlet (13) are arranged on the connecting seat (331). The nozzle (332) is arranged on the connecting seat (331) and above the right part of the adjusting body (31). The nozzle (332) is provided with a spray hole (3321) running through it. The nozzle (332) is above the right part of the adjusting body (31) and is connected to the connecting seat (331). The first gas outlet (13) is communicated with the spray hole (3321). Wherein, when the medium pressure in the pipe detected by the pressure detection structure (2) is greater than the preset value, the driving component (22) extends upward into the control body (1) along the pressure taking inner cavity (211) through the driving mounting port (2131) to push the adjusting body (31) upward to abut against the nozzle (332) so as to close the spray hole (3321); when the medium pressure in the pipe detected by the pressure detection structure (2) is less than the preset value, the driving component (22) moves downward to drive the adjusting body (31) to move downward and separate from the nozzle (332) so as to open the spray hole (3321).

5. The pneumatic pressure controller for a valve according to claim 4, characterized in that, it further includes a pre-tightening force adjusting structure (4). The adjusting body (31) is provided with a pre-tightening force adjusting screw hole (315) along the height direction of the control body (1). The pre-tightening force adjusting screw hole (315) is arranged in the middle of the adjusting body (31). The outer peripheral wall of the pre-tightening force adjusting structure (4) is provided with a thread section matching the pre-tightening force adjusting screw hole (315). The pre-tightening force adjusting structure (4) extends into the control body (1) through the pre-tightening force adjusting screw hole (315), and the lower end of the pre-tightening force adjusting structure (4) abuts against the top of the driving component (22).

6. The pneumatic pressure controller for a valve according to claim 3, characterized in that, the pressure adjusting component (32) further includes a thrust bearing (324) clamped between the pressure elastic member (322) and the adjusting nut (323).

7. The pneumatic pressure controller for a valve according to any one of claims 1 to 6, characterized in that, it further includes a feedback structure (5) located between the control body (1) and the air pressure adjusting structure (3) and connected to the control body (1) and the air pressure adjusting structure (3) respectively. The feedback structure (5) is used to slow down the speed at which the pressure detection structure (2) closes the first gas outlet (13) and the speed at which the pressure detection structure (2) opens the first gas outlet (13).

8. The pneumatic pressure controller for a valve according to claim 7, characterized in that, the feedback structure (5) includes: a rotating member (51) rotatably penetrating through the control body (1); The valve stem feedback member (52) is located at the rear side of the control body (1). The valve stem feedback member (52) includes a first end (521) and a second end (522). The first end (521) of the valve stem feedback member (52) is used to be connected to the valve stem, and the second end (522) of the valve stem feedback member (52) is connected to the rear end of the rotating member (51). The feedback plate (53) is arranged at the front end of the rotating member (51). The feedback rod (54) is located at the front side of the control body (1). A deep groove ball bearing (541) is arranged at the rear side of the feedback rod (54). The middle part of the feedback rod (54) is rotatably connected to the front end of the feedback plate (53) through the deep groove ball bearing (541). The connecting rod (55) is arranged at the front side of the control body (1), and the connecting rod (55) is rotatably connected to the right end of the feedback rod (54). The feedback elastic member (56) is clamped between the air pressure adjustment structure (3) and the feedback rod (54). Wherein, in a state where the valve stem feedback member (52) is connected to the valve stem, when the valve stem moves downward, the valve stem drives the valve stem feedback member (52) to move downward, causing the rotating member (51) to rotate counterclockwise, so as to drive the left end of the feedback rod (54) to move upward, stretching the feedback elastic member (56) upward; when the valve stem moves upward, the valve stem drives the valve stem feedback member (52) to move upward, causing the rotating member (51) to rotate clockwise, so as to drive the left end of the feedback rod (54) to move downward, stretching the feedback elastic member (56) downward.

9. A pneumatic control valve Characterized in that It includes The pneumatic pressure controller for valves as described in any one of claims 1 to 8 A pneumatic actuator, which is communicated with the second gas outlet (14). The pneumatic pressure controller for valves is used to control the air pressure of the pneumatic actuator An air supply pump, which is communicated with the gas inlet (12). A valve body, which has a valve stem. The pneumatic actuator is connected to the valve stem to drive the valve stem to move.

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