Pneumatic film intelligent fluorine-lined single-seat regulating valve

Abstract

The utility model discloses a pneumatic film intelligent fluorine-lined single-seat regulating valve, and aims to overcome the defect that a valve core is easy to damage due to the fact that the valve core is subjected to large jacking force of an actuating mechanism for a long time in the prior art. The technical problem is solved through the following technical scheme: the valve comprises a valve body, a valve rod and an actuating mechanism, wherein a valve cover matched with the valve body is arranged on the valve body; the valve rod penetrates through the valve cover, enters the valve body and is connected with the valve core; the executing mechanism comprises a limiting piece, a reset air cavity and a diaphragm, the diaphragm is connected with the valve rod, a reset spring pushing the diaphragm to reset is arranged in the reset air cavity, and the limiting piece limits the stroke of the valve rod towards the valve body. The limiting sleeve is arranged in the outer circumferential direction of the valve rod in a sleeving mode, and therefore the membrane is limited. Therefore, the situation that the service life of the valve element is affected due to the fact that the thrust borne by the valve rod is too large and the thrust of the valve element abutting against the valve seat is too large is avoided, and the service life of the adjusting valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fluorine-lined regulating valves, and more specifically, to a pneumatic film intelligent fluorine-lined single-seat regulating valve. Background Art

[0002] Pneumatic diaphragm intelligent fluorine-lined single-seat regulating valve, equipped with multi-spring actuator, has the advantages of compact structure, light weight, sensitive action, precise flow characteristics, etc. It is widely used to control corrosive media, and process parameters such as pressure, flow, temperature, and liquid level are kept at given values.

[0003] Conventional pneumatic diaphragm intelligent fluorine-lined single-seat regulating valves are made of PTFE or PFA at the points where they come into contact with the medium. The valve core and valve body sealing surfaces cannot directly use metal to support the thrust of the actuator, and can only directly bear the thrust of the entire actuator using the soft sealing material PTFE or PFA. Therefore, the deformation of the valve core and valve body sealing surfaces cannot be controlled, causing the sealing surface to be damaged due to the large thrust, shortening the service life of the valve and increasing the operating cost of the working conditions.

[0004] The Chinese patent announcement number is CN215950397U, and the announcement date is March 4, 2022. The name of the application is a pneumatic fluorine-lined cut-off regulating valve. The application discloses a regulating valve. When in use, the spring directly pushes the actuator, causing the valve core to be subjected to a large top thrust for a long time, causing the valve core to be deformed and damaged due to the long-term large thrust, shortening the service life of the valve. Utility Model Content

[0005] The utility model overcomes the deficiency in the prior art that the valve core is subjected to a large top thrust of the actuator for a long time, which makes the valve core easily damaged, and provides a pneumatic film intelligent fluorine-lined single-seat regulating valve, which can control the top thrust of the actuator on the valve core, thereby reducing the top thrust on the valve core, extending the service life of the valve core, and further extending the service life of the entire regulating valve.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a pneumatic diaphragm intelligent fluorine-lined single-seat regulating valve, comprising: a valve body, a valve stem and an actuator, the valve body is provided with a valve cover that matches the valve body; the valve stem passes through the valve cover into the valve body and is connected to the valve core; the actuator includes a limiter, a reset air cavity and a diaphragm, the diaphragm is connected to the valve stem, a reset spring that pushes the diaphragm to reset is provided in the reset air cavity, and the limiter limits the travel of the valve stem toward the valve body.

[0007] In the utility model, a limiting sleeve is sleeved on the outer circumferential direction of the valve stem. When the actuator is working, after the valve stem moves toward the valve body for a certain stroke, the diaphragm abuts against the end of the limiting sleeve, thereby limiting the diaphragm. This prevents the valve stem from receiving too much thrust, which causes the valve core to abut against the valve seat, thus affecting the service life of the valve core, thereby improving the service life of the regulating valve.

[0008] Preferably, the actuator also includes a first mold cover, a second mold cover and a diaphragm. The first mold cover and the second mold cover cooperate to form an air cavity. The diaphragm divides the air cavity into a reset air cavity and an execution air cavity. The reset spring abuts between the diaphragm and the first mold cover.

[0009] The return spring can push the diaphragm to make the valve stem move toward the valve body, and the limit sleeve limits the diaphragm.

[0010] Preferably, the actuator further comprises a first mold cover, a second mold cover and a diaphragm, the second mold cover and the diaphragm cooperate to form an actuator air cavity, and the limit member is arranged in the actuator air cavity.

[0011] The return spring can push the diaphragm to make the valve stem move toward the valve body, and the limit sleeve limits the diaphragm.

[0012] Preferably, the limiting member is a limiting sleeve, the valve stem passes through the actuator air cavity and is connected to the diaphragm, and the limiting sleeve is arranged on the outer side of the valve stem.

[0013] When the diaphragm is reset, the limit sleeve limits the movement of the diaphragm, thereby limiting its reset stroke.

[0014] Preferably, a diaphragm gasket is provided on the top of the limiting sleeve, a lower gasket ring groove is provided on the lower end surface of the diaphragm gasket, and the lower gasket ring groove abuts against the upper end surface of the limiting sleeve.

[0015] When the diaphragm is reset, the diaphragm can press against the upper end of the diaphragm gasket. Since the upper end surface of the diaphragm gasket has a larger area, the pressure on the diaphragm can be reduced, thereby protecting the diaphragm.

[0016] Preferably, a diaphragm tray is provided on one side of the diaphragm close to the return spring, and two ends of the return spring are respectively in contact with the first mold cover and the diaphragm tray.

[0017] The diaphragm tray and the diaphragm are fitted together, and the return spring abuts against the diaphragm tray, thereby transmitting the contact force of the return spring to the diaphragm through the diaphragm tray, so that the diaphragm tray can disperse the force of the return spring on the diaphragm, which not only protects the diaphragm, but also enables the return spring to abut against the diaphragm more stably.

[0018] Preferably, an actuator bracket is provided at the upper end of the valve cover, and the actuator is arranged on the actuator bracket.

[0019] The execution bracket mainly plays a supporting role, and the actuator is arranged at the upper end of the execution bracket.

[0020] Preferably, an air source through hole is provided on the execution bracket, and the air source through hole is communicated with the execution air cavity.

[0021] The pneumatic device controls the size of the actuator air cavity by controlling the air supply or exhaust into the air source through hole, thereby controlling the rise and fall of the diaphragm. The rise and fall of the diaphragm controls the rise and fall of the valve stem, thereby controlling the opening and closing of the valve body.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model sets a limit sleeve on the outer circumference of the valve stem. When the actuator is working, after the valve stem moves toward the valve body for a certain stroke, the diaphragm abuts against the end of the limit sleeve, thereby limiting the diaphragm. This prevents the valve stem from receiving too much thrust, which causes the valve core to abut against the valve seat, thus affecting the service life of the valve core, thereby improving the service life of the entire regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of Example 1 of the utility model.

[0025] Figure 2 It is a structural schematic diagram of Example 2 of the present utility model.

[0026] Figure 3 It is a structural schematic diagram of Example 3 of the present utility model.

[0027] In the figure: 1, valve body, 11, inlet channel, 12, outlet channel, 13, cylindrical cavity;

[0028] 2. Valve stem;

[0029] 3. actuator, 31. first mold cover, 32. second mold cover, 321. through hole, 33. diaphragm, 331. perforation, 34. reset spring, 35. limit sleeve, 36. reset air cavity, 37. actuator air cavity, 38. diaphragm gasket, 381. lower gasket ring groove, 39. diaphragm tray;

[0030] 4. Valve cover, 41. First perforation;

[0031] 5. Valve core;

[0032] 6. Execution bracket, 61. Air source through hole;

[0033] 7. Push rod, 71. Push head. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0035] Example 1: Reference Figure 1 As shown, a pneumatic film intelligent fluorine-lined single-seat regulating valve includes: a valve body 1, a valve stem 2 and an actuator 3.

[0036] A valve cavity is provided in the valve body 1, and an inlet channel 11 and an outlet channel 12 communicating with the valve cavity are also provided in the valve body 1, and both the inlet channel 11 and the outlet channel 12 are connected to the valve cavity. A cylindrical cavity 13 is vertically provided at the bottom of the valve cavity, and the bottom of the cylindrical cavity 13 is connected to the inlet channel 11, and the top of the cylindrical cavity 13 is connected to the valve cavity. In other words, the inlet channel 11 is connected to the valve cavity through the cylindrical cavity 13.

[0037] The valve body 1 is provided with a valve cover 4 that matches the valve body 1, and the valve cover 4 is fixedly connected to the valve body 1 by bolts. The valve cover 4 is provided with a first through hole 41, and the valve stem 2 enters the valve body 1 after passing through the first through hole 41 of the valve cover 4. A valve core 5 is provided in the valve cavity, and the valve core 5 matches with the top of the cylindrical cavity 13, thereby realizing the function of controlling the opening and closing of the cylindrical cavity 13. The bottom end of the valve stem 2 passes through the valve cover 4 and is fixedly connected to the valve core 5, so that the function of controlling the valve core 5 can be realized by controlling the valve stem 2.

[0038] The execution structure in this embodiment adopts a pneumatic actuator 3, that is, the increase and decrease of gas is used to control the rise and fall of the valve stem 2, thereby controlling the coordination between the valve core 5 and the cylindrical cavity 13 to realize the switch of the control valve body 1.

[0039] The actuator 3 includes a first mold cover 31, a second mold cover 32, a diaphragm 33, a reset spring 34 and a limiter; the first mold cover 31 and the second mold cover 32 cooperate to form an air cavity, and the diaphragm 33 divides the air cavity into two parts, which are a reset air cavity 36 and an actuator air cavity 37. The reset spring 34 is arranged in the reset air cavity 36, and the reset spring 34 abuts between the diaphragm 33 and the first mold cover 31, and the reset spring 34 pushes the diaphragm 33 to reset.

[0040] The upper end of the valve stem 2 passes through the execution air cavity 37 and is connected to the diaphragm 33. Specifically, a through hole 331 is provided on the diaphragm 3. After the valve stem 2 passes through the through hole 331, a clamping groove is provided in the outer circumferential direction of the valve stem 2, and the clamping groove is clamped at the edge of the through hole 331. The through hole 331 and the clamping groove are sealed and connected, thereby ensuring that the reset air cavity 36 and the execution air cavity 37 are not connected, and the diaphragm 33 can drive the valve stem 2 to move up and down when moving.

[0041] The limiting member in this embodiment is a limiting sleeve 35, and the valve stem 2 passes through the execution air cavity 37 and is connected to the diaphragm 33, and the limiting sleeve 35 is sleeved on the outer side of the valve stem 2. When the diaphragm 33 is reset, the limiting sleeve 35 limits the movement of the diaphragm 33, thereby playing the function of limiting its reset stroke. In addition, in order to buffer the diaphragm 33 and reduce the impact force received by the diaphragm 33, a diaphragm gasket 38 is arranged on the top of the limiting sleeve 35, and the lower end surface of the diaphragm gasket 38 is provided with a lower gasket ring groove 381, and the lower gasket ring groove 381 is abutted against the upper end surface of the limiting sleeve 35. When the diaphragm 33 is reset, the diaphragm 33 can be pressed against the upper end of the diaphragm gasket 38. Since the upper end surface of the diaphragm gasket 38 has a larger area, the pressure on the diaphragm 33 can be reduced, thereby protecting the diaphragm 33.

[0042] A diaphragm tray 39 is provided on one side of the diaphragm 33 close to the return spring 34, and the two ends of the return spring 34 are respectively in contact with the first mold cover 31 and the diaphragm tray 39. The diaphragm tray 39 fits the diaphragm 33, and the return spring 34 abuts against the diaphragm tray 39, so that the contact force of the return spring 34 is transmitted to the diaphragm 33 through the diaphragm tray 39, so that the diaphragm tray 39 can disperse the force of the return spring 34 on the diaphragm 33, which can not only protect the diaphragm 33, but also make the return spring 34 more stably abut against the diaphragm 33.

[0043] In addition, an actuator bracket 6 is provided at the upper end of the valve cover 4, and the actuator 3 is provided on the actuator bracket 6. The actuator bracket 6 mainly plays a supporting role, and the actuator 3 is provided at the upper end of the actuator bracket 6. An air source through hole 61 is provided on the actuator bracket 6, one end of the air source through hole 61 is connected to the actuator air cavity 37, and the other end of the air source through hole 61 is connected to the pneumatic device. The pneumatic device controls the size of the actuator air cavity 37 by controlling the air supply or air extraction into the air source through hole 61, thereby controlling the lifting and lowering of the diaphragm 33, and through the lifting and lowering of the diaphragm 33, the lifting and lowering of the valve stem 2 is controlled, thereby realizing the opening and closing of the control valve body 1.

[0044] In the present invention, by sleeve-arranging the limiting sleeve 35 in the outer circumferential direction of the valve stem 2, when the actuator 3 is working, the reset spring 34 pushes the diaphragm 33 to move, and after the reset spring 34 pushes the diaphragm 33 to move a certain distance, the diaphragm 33 abuts against the end of the limiting sleeve 35, thereby limiting the diaphragm 33. This prevents the thrust of the reset spring 34 from being too large, causing the thrust of the valve core 5 abutting against the valve seat to be too large, thereby affecting the service life of the valve core 5, thereby improving the service life of the entire regulating valve.

[0045] Example 2: Reference Figure 2 As shown, a pneumatic film intelligent fluorine-lined single-seat regulating valve includes: a valve body 1, a valve stem 2 and an actuator 3.

[0046] A valve cavity is provided in the valve body 1, and an inlet channel 11 and an outlet channel 12 communicating with the valve cavity are also provided in the valve body 1, and both the inlet channel 11 and the outlet channel 12 are connected to the valve cavity. A cylindrical cavity 13 is vertically provided at the bottom of the valve cavity, and the bottom of the cylindrical cavity 13 is connected to the inlet channel 11, and the top of the cylindrical cavity 13 is connected to the valve cavity. In other words, the inlet channel 11 is connected to the valve cavity through the cylindrical cavity 13.

[0047] The valve body 1 is provided with a valve cover 4 that matches the valve body 1, and the valve cover 4 is fixedly connected to the valve body 1 by bolts. The valve cover 4 is provided with a first through hole 41, and the valve stem 2 enters the valve body 1 after passing through the first through hole 41 of the valve cover 4. A valve core 5 is provided in the valve cavity, and the valve core 5 matches with the top of the cylindrical cavity 13, thereby realizing the function of controlling the opening and closing of the cylindrical cavity 13. The bottom end of the valve stem 2 passes through the valve cover 4 and is fixedly connected to the valve core 5, so that the function of controlling the valve core 5 can be realized by controlling the valve stem 2.

[0048] The execution structure in this embodiment adopts a pneumatic actuator 3, that is, the increase and decrease of gas is used to control the rise and fall of the valve stem 2, thereby controlling the coordination between the valve core 5 and the cylindrical cavity 13 to realize the switch of the control valve body 1.

[0049] The actuator 3 includes a first mold cover 31, a second mold cover 32, a diaphragm 33, a reset spring 34 and a limiter; the first mold cover 31 and the second mold cover 32 cooperate to form an air cavity, and the diaphragm 33 divides the air cavity into two parts, which are a reset air cavity 36 and an actuator air cavity 37. The reset spring 34 is arranged in the reset air cavity 36, and the reset spring 34 abuts between the diaphragm 33 and the first mold cover 31, and the reset spring 34 pushes the diaphragm 33 to reset.

[0050] The upper end of the valve stem 2 passes through the execution air cavity 37 and is connected to the diaphragm 33. Specifically, a through hole 331 is provided on the diaphragm 3. After the valve stem 2 passes through the through hole 331, a clamping groove is provided in the outer circumferential direction of the valve stem 2, and the clamping groove is clamped at the edge of the through hole 331. The through hole 331 and the clamping groove are sealed and connected, thereby ensuring that the reset air cavity 36 and the execution air cavity 37 are not connected, and the diaphragm 33 can drive the valve stem 2 to move up and down when moving.

[0051] In this embodiment, the structure of the limiter is different from that in Embodiment 1. The limiter is a push rod 7 that can be extended and retracted and is arranged in the execution air cavity 37. Specifically, a through hole 321 is arranged on the second mold cover 32, and the push rod 7 is threadedly connected in the through hole 321. The push rod 7 and the through hole 321 are sealed and matched to prevent the gas in the air cavity from leaking out. A top head 71 is arranged at one end of the push rod 7 close to the diaphragm 33. The area of ​​the top head 71 is larger than that of the push rod 7, and the top head 71 is made of rubber material. In order to make the force on the diaphragm 33 more balanced, two through holes 321 are symmetrically arranged on the second mold cover 32 in this embodiment, and the push rod 7 is threadedly connected in the through hole 321 accordingly.

[0052] The utility model sets a push rod 7 in the execution air cavity 37, so that the length of the top cover in the execution air cavity 37 can be adjusted by rotating the push rod 7, so that when the valve stem 2 moves toward the valve body 1, the movement stroke of the diaphragm 33 can be limited, thereby realizing the function of controlling the movement stroke of the valve stem 2. And by adjusting the length of the push rod 7 in the execution air cavity 37, the movement stroke of the valve stem 2 can be controlled, so as to prevent the thrust of the return spring 34 from being too large, so that the thrust of the valve core 5 against the valve seat is too large, affecting the service life of the valve core 5, thereby improving the service life of the entire regulating valve.

[0053] A diaphragm tray 39 is provided on one side of the diaphragm 33 close to the return spring 34, and the two ends of the return spring 34 are respectively in contact with the first mold cover 31 and the diaphragm tray 39. The diaphragm tray 39 fits the diaphragm 33, and the return spring 34 abuts against the diaphragm tray 39, so that the contact force of the return spring 34 is transmitted to the diaphragm 33 through the diaphragm tray 39, so that the diaphragm tray 39 can disperse the force of the return spring 34 on the diaphragm 33, which can not only protect the diaphragm 33, but also make the return spring 34 more stably abut against the diaphragm 33.

[0054] In addition, an actuator bracket 6 is provided at the upper end of the valve cover 4, and the actuator 3 is provided on the actuator bracket 6. The actuator bracket 6 mainly plays a supporting role, and the actuator 3 is provided at the upper end of the actuator bracket 6. An air source through hole 61 is provided on the actuator bracket 6, one end of the air source through hole 61 is connected to the actuator air cavity 37, and the other end of the air source through hole 61 is connected to the pneumatic device. The pneumatic device controls the size of the actuator air cavity 37 by controlling the air supply or air extraction into the air source through hole 61, thereby controlling the lifting and lowering of the diaphragm 33, and through the lifting and lowering of the diaphragm 33, the lifting and lowering of the valve stem 2 is controlled, thereby realizing the opening and closing of the control valve body 1.

[0055] In this embodiment, by arranging the push rod 7 in the execution air cavity 37, the length of the top cover in the execution air cavity 37 can be adjusted by rotating the push rod 7, so that when the valve stem 2 moves toward the valve body 1, the movement stroke of the diaphragm 33 can be limited, thereby realizing the function of controlling the movement stroke of the valve stem 2. And by adjusting the length of the push rod 7 in the execution air cavity 37, the movement stroke of the valve stem 2 can be controlled, thereby preventing the thrust of the valve core 5 against the valve seat from being too large due to the thrust of the return spring 34 being too large, thereby affecting the service life of the valve core 5, thereby improving the service life of the entire regulating valve.

[0056] Example 3: Reference Figure 3 As shown, the difference between this embodiment and embodiment 1 is that the pneumatic film intelligent fluorine-lined single-seat regulating valve in embodiment 1 adopts an air-opening type. That is, in a non-ventilated state, the pneumatic film intelligent fluorine-lined single-seat regulating valve in embodiment 1 is in a normally closed state. Since the return spring 34 pushes the valve stem 2 to move toward the direction close to the valve body 1, it is in a normally closed state and needs to supply air to the execution air chamber 37 to open.

[0057] The pneumatic film intelligent fluorine-lined single-seat regulating valve in this embodiment adopts the air-to-close type. That is, in the non-ventilated state, the pneumatic film intelligent fluorine-lined single-seat regulating valve in this embodiment is in the normally open state. Since the return spring 34 pushes the valve stem 2 to move away from the valve body 1, it is in the normally open state. The gas in the execution air cavity 37 needs to be pumped out so that the diaphragm 33 overcomes the force of the return spring 34 before it can be closed.

[0058] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A pneumatic film intelligent fluorine-lined single-seat regulating valve, characterized in that: include: The valve body, valve stem and actuator are provided with a valve cover which matches the valve body; the valve stem passes through the valve cover and enters the valve body and is connected with the valve core; the actuator includes a limiter, a reset air cavity and a diaphragm, the diaphragm is connected with the valve stem, a reset spring which pushes the diaphragm to reset is provided in the reset air cavity, and the limiter limits the travel of the valve stem toward the valve body.

2. The pneumatic diaphragm intelligent fluorine-lined single-seat regulating valve according to claim 1 is characterized in that: The actuator also includes a first mold cover, a second mold cover and a diaphragm. The first mold cover and the second mold cover cooperate to form an air cavity. The diaphragm divides the air cavity into a reset air cavity and an execution air cavity. The reset spring abuts between the diaphragm and the first mold cover.

3. The pneumatic film intelligent fluorine-lined single-seat regulating valve according to claim 1 or 2 is characterized in that: The actuator also includes a first mold cover, a second mold cover and a diaphragm. The second mold cover and the diaphragm cooperate to form an actuator air cavity, and the limiting member is arranged in the actuator air cavity.

4. The pneumatic diaphragm intelligent fluorine-lined single-seat regulating valve according to claim 3 is characterized in that: The limiting member is a limiting sleeve, the valve stem passes through the actuator air cavity and is connected with the diaphragm, and the limiting sleeve is arranged on the outer side of the valve stem.

5. The pneumatic film intelligent fluorine-lined single-seat regulating valve according to claim 3 is characterized in that: A diaphragm gasket is arranged on the top of the limiting sleeve, a lower gasket ring groove is arranged on the lower end surface of the diaphragm gasket, and the lower gasket ring groove is abutted against the upper end surface of the limiting sleeve.

6. The pneumatic diaphragm intelligent fluorine-lined single-seat regulating valve according to claim 1 is characterized in that: A diaphragm tray is arranged on one side of the diaphragm close to the return spring, and two ends of the return spring are respectively in contact with the first mold cover and the diaphragm tray.

7. The pneumatic diaphragm intelligent fluorine-lined single-seat regulating valve according to claim 1, 2 or 6, characterized in that: An execution bracket is arranged at the upper end of the valve cover, and the execution mechanism is arranged on the execution bracket.

8. The pneumatic film intelligent fluorine-lined single-seat regulating valve according to claim 7 is characterized in that: An air source through hole is arranged on the execution bracket, and the air source through hole is communicated with the execution air cavity.

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