Pneumatic control valve

Abstract

The utility model discloses a pneumatic control valve which comprises a valve body, a first valve seat and a second valve seat are arranged in the valve body, a valve element is arranged in the valve body in a sliding mode, the lower half portion of the valve element abuts against the first valve seat, and the upper side of the valve element abuts against an auxiliary valve element. The upper side of the auxiliary valve element is connected with the inner cavity wall of the valve body through a second spring, and the auxiliary valve element abuts against the second valve seat. The auxiliary valve core is arranged on the upper side of the valve core, so that the flow is controlled by the two valve cores, the flow can be still limited through the auxiliary valve core after the valve cores are abraded, the precision of the regulating valve is ensured, and meanwhile, the valve can be tightly closed; the impact force on the auxiliary valve core when the pressure of the pressurized liquid is unstable can be effectively buffered, and the service life of the auxiliary valve core is prolonged, namely the service life of the whole regulating valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to a pneumatic regulating valve. Background Art

[0002] Pneumatic control valve uses compressed gas as the power source, cylinder as the actuator, and uses valve positioner, converter, solenoid valve, position-holding valve, gas storage tank, gas filter and other accessories to drive the valve, realize switch quantity or proportional regulation, and receive the control signal of industrial automation control system to complete the regulation of pipeline medium: flow, pressure, temperature, liquid level and other process parameters. The characteristics of pneumatic control valve are simple control, fast response, and inherent safety, without the need for additional explosion-proof measures.

[0003] During long-term use of the pneumatic control valve, the valve core is damaged, resulting in the valve not closing tightly and the accuracy of regulating flow is reduced. Utility Model Content

[0004] The purpose of the utility model is to provide a pneumatic regulating valve to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic regulating valve, comprising: a valve body, a first valve seat and a second valve seat are provided in the valve body, a valve core is slidably arranged in the valve body, the lower half of the valve core abuts against the first valve seat, the upper side of the valve core abuts against an auxiliary valve core, the upper side of the auxiliary valve core is connected to the inner cavity wall of the valve body through a second spring, and the auxiliary valve core abuts against the second valve seat.

[0006] Furthermore, a liquid inlet channel and a liquid outlet channel are provided in the valve body, and the communicating liquid inlet channel and liquid outlet channel are cut off by the valve core and the auxiliary valve core.

[0007] Furthermore, the valve core is a hexagonal body, the top end of the valve core is fixedly connected to a valve stem, and the auxiliary valve core is sleeved on the valve stem.

[0008] Furthermore, sealing rings are provided between the valve stem and the auxiliary valve core and between the auxiliary valve core and the inner wall of the valve body.

[0009] Furthermore, a bracket is fixedly connected to the top of the valve body, a membrane actuator is fixedly connected to the top of the bracket, and a positioner is installed on the bracket.

[0010] Furthermore, the membrane actuator comprises a shell, the inner cavity of the shell is divided into an upper cavity of the membrane chamber and a lower cavity of the membrane chamber by a rubber diaphragm, and an air inlet is opened on the shell, and the air inlet is communicated with the upper cavity of the membrane chamber.

[0011] Furthermore, a membrane cover is provided in the lower cavity of the membrane chamber, the top end of the valve stem is fixedly connected to the membrane cover, and the valve stem is connected to the inner wall of the shell through a plurality of first springs.

[0012] Furthermore, a travel scale is provided on the bracket, and a pointer is provided on the valve stem.

[0013] In the above technical solution, the pneumatic regulating valve provided by the utility model has the beneficial effects of:

[0014] The utility model realizes flow control by two valve cores by arranging an auxiliary valve core on the upper side of the valve core. After the valve core is worn, the flow can still be limited by the auxiliary valve core, thereby ensuring the accuracy of the regulating valve and at the same time enabling the valve to be closed tightly. Moreover, by setting the second spring, the impact force on the auxiliary valve core when the pressure of the pressurized liquid is unstable can be effectively buffered, thereby extending the service life of the auxiliary valve core, that is, extending the service life of the regulating valve as a whole.

[0015] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0016] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure provided for an embodiment of the utility model;

[0019] Figure 2 The embodiment of the utility model provides Figure 1 Enlarged view of point A.

[0020] Description of reference numerals:

[0021] 1. Valve body; 11. Liquid inlet channel; 12. Liquid outlet channel; 14. First valve seat; 15. Second valve seat; 2. Bracket; 21. Stroke scale; 3. Diaphragm actuator; 31. Upper cavity of diaphragm chamber; 32. Lower cavity of diaphragm chamber; 33. Air inlet; 34. Diaphragm cover; 35. First spring; 36. Rubber diaphragm; 4. Positioner; 5. Valve core; 6. Auxiliary valve core; 7. Valve stem; 71. Pointer; 8. Second spring; 9. Sealing ring. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0023] Please refer to 1-2, a pneumatic regulating valve includes: a valve body 1, a first valve seat 14 and a second valve seat 15 are opened in the valve body 1, a valve core 5 is slidably arranged in the valve body 1, the lower half of the valve core 5 abuts on the first valve seat 14, the upper side of the valve core 5 abuts on the auxiliary valve core 6, the upper side of the auxiliary valve core 6 is connected to the inner cavity wall of the valve body 1 through the second spring 8, and the auxiliary valve core 6 abuts on the second valve seat 15.

[0024] Specifically, the utility model realizes flow control by two valve cores by setting an auxiliary valve core 6 on the upper side of the valve core 5. After the valve core 5 is worn, the flow can still be limited by the auxiliary valve core 6 to ensure the accuracy of the regulating valve. At the same time, the valve can be closed tightly. Moreover, by setting the second spring 8, the impact force on the auxiliary valve core 6 when the pressure of the pressurized liquid is unstable can be effectively buffered, thereby extending the service life of the auxiliary valve core 6, that is, extending the service life of the regulating valve as a whole.

[0025] Furthermore, a liquid inlet channel 11 and a liquid outlet channel 12 are defined in the valve body 1 , and the communicating liquid inlet channel 11 and liquid outlet channel 12 are blocked by the valve core 5 and the auxiliary valve core 6 .

[0026] Specifically, one end of the second spring 8 abuts against the upper side of the auxiliary valve core 6, and the other end of the second spring 8 abuts against the inner wall of the valve body 1. The second spring 8 itself is in a compressed state. The elastic force of the second spring 8 presses the auxiliary valve core 6 tightly against the valve core 5, and the pressure of the liquid cannot lift the auxiliary valve core 6; the pressurized liquid enters from the liquid inlet channel 11, flows through the first valve seat 14 and the second valve seat 15, and then flows out from the liquid outlet channel 12. Through the position of the valve core 5 and the auxiliary valve core 6, the water flow area of ​​the liquid is limited, thereby achieving the purpose of controlling the flow rate.

[0027] Furthermore, the valve core 5 is a hexagonal body, the top of the valve core 5 is fixedly connected to a valve stem 7, the auxiliary valve core 6 is sleeved on the valve stem 7, and sealing rings 9 are provided between the valve stem 7 and the auxiliary valve core 6 and between the auxiliary valve core 6 and the inner wall of the valve body 1.

[0028] Specifically, the sealing ring 9 is a sliding sealing ring. By providing the sealing ring 9, the sealing between the auxiliary valve core 6 and the valve stem 7 as well as the inner cavity of the valve body 1 is strengthened to prevent liquid from overflowing and to avoid liquid from corroding the second spring 8.

[0029] Furthermore, the top end of the valve body 1 is fixedly connected to a bracket 2, the top end of the bracket 2 is fixedly connected to a diaphragm actuator 3, a positioner 4 is installed on the bracket 2, the diaphragm actuator 3 includes a shell, the inner cavity of the shell is divided into an upper cavity 31 of the diaphragm chamber and a lower cavity 32 of the diaphragm chamber by a rubber diaphragm 36, an air inlet 33 is opened on the shell, the air inlet 33 is connected to the upper cavity 31 of the diaphragm chamber, a diaphragm cover 34 is arranged in the lower cavity 32 of the diaphragm chamber, the top end of the valve stem 7 is fixedly connected to the diaphragm cover 34, and the valve stem 7 is connected to the inner wall of the shell through multiple first springs 35.

[0030] Specifically, when pressurized gas enters the upper cavity 31 of the diaphragm chamber from the air inlet 33, the pressurized gas causes the rubber diaphragm 36 to abut against the diaphragm cover 34, and the diaphragm cover 34 squeezes the first spring 35. The valve stem 7 then moves downward to drive the valve core 5 to block the first valve seat 14. By controlling the gas pressure in the upper cavity 31 of the diaphragm chamber, the distance between the valve core 5 and the first valve seat 14 is controlled, thereby achieving the purpose of controlling the liquid flow rate.

[0031] Furthermore, a travel scale 21 is provided on the bracket 2 , and a pointer 71 is provided on the valve stem 7 .

[0032] Specifically, the stroke scale 21 is fixedly mounted on the bracket 2 , and the pointer 71 is mounted on the valve stem 7 . When the valve stem 7 descends, the scale on the stroke scale 21 pointed to by the pointer 71 changes, thereby recording the descending stroke of the valve stem 7 .

[0033] In this utility model, reference is made to Figure 1 to Figure 2 First, the pressurized liquid enters the valve body 1 from the liquid inlet channel 11, and the positions of the valve core 5 and the auxiliary valve core 6 are controlled by the film actuator 3, so that the water passage is opened between the valve core 5 and the first valve seat 14 and between the auxiliary valve core 6 and the second valve seat 15, so that the liquid inlet channel 11 is connected with the liquid outlet channel 12. During this process, the second spring 8 abuts the auxiliary valve core 6 against the valve core 5, so that the size of the water passage between the valve core 5 and the first valve seat 14 is consistent with the size of the water passage between the auxiliary valve core 6 and the second valve seat 15. Even if the valve core 5 is worn, the auxiliary valve core 6 can still control the flow rate while ensuring accuracy. At the same time, when the pressure of the pressurized liquid fluctuates, the pressurized water impacts the auxiliary valve core 6. Under the buffering effect of the second spring 8, the destructive force of the pressurized water on the auxiliary valve core 6 is reduced, ensuring that the service life of the regulating valve is extended while ensuring accuracy.

[0034] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pneumatic regulating valve, comprising: A valve body (1), characterized in that: a first valve seat (14) and a second valve seat (15) are provided in the valve body (1), a valve core (5) is slidably arranged in the valve body (1), the lower half of the valve core (5) abuts against the first valve seat (14), the upper side of the valve core (5) abuts against an auxiliary valve core (6), the upper side of the auxiliary valve core (6) is connected to the inner cavity wall of the valve body (1) via a second spring (8), and the auxiliary valve core (6) abuts against the second valve seat (15).

2. A pneumatic control valve according to claim 1, characterized in that: A liquid inlet channel (11) and a liquid outlet channel (12) are provided in the valve body (1), and the connected liquid inlet channel (11) and liquid outlet channel (12) are cut off by the valve core (5) and the auxiliary valve core (6).

3. The pneumatic regulating valve according to claim 1, characterized in that: The valve core (5) is a hexagonal body, the top end of the valve core (5) is fixedly connected to a valve stem (7), and the auxiliary valve core (6) is sleeved on the valve stem (7).

4. A pneumatic regulating valve according to claim 3, characterized in that: Sealing rings (9) are provided between the valve stem (7) and the auxiliary valve core (6), and between the auxiliary valve core (6) and the inner wall of the valve body (1).

5. The pneumatic regulating valve according to claim 3, characterized in that: The top end of the valve body (1) is fixedly connected to a bracket (2), the top end of the bracket (2) is fixedly connected to a membrane actuator (3), and a positioner (4) is mounted on the bracket (2).

6. A pneumatic regulating valve according to claim 5, characterized in that: The membrane actuator (3) comprises a shell, the inner cavity of the shell is divided into an upper cavity (31) and a lower cavity (32) of the membrane chamber by a rubber diaphragm (36), and an air inlet (33) is provided on the shell, the air inlet (33) being in communication with the upper cavity (31) of the membrane chamber.

7. A pneumatic regulating valve according to claim 6, characterized in that: A membrane cover (34) is arranged in the lower cavity (32) of the membrane chamber, the top end of the valve stem (7) is fixedly connected to the membrane cover (34), and the valve stem (7) is connected to the inner wall of the housing via a plurality of first springs (35).

8. The pneumatic regulating valve according to claim 5, characterized in that: The bracket (2) is provided with a travel scale (21), and the valve stem (7) is provided with a pointer (71).

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