Pressure control valve

Abstract

The pressure control valve comprises a valve shell and a piston, a movable cavity is formed in the valve shell, the movable cavity is provided with a first end, a second end and a peripheral wall, the first end and the second end are oppositely arranged, the first end is provided with a first input channel used for being communicated with a first pressure source, and the second end is provided with a second input channel used for being communicated with a second pressure source. The second input channel is used for communicating with a second pressure source, and an output channel is formed in the peripheral wall and communicates with the outside. The piston is located in the movable cavity and can move between the first end and the second end, and the piston separates the first input channel from the output channel. And when the pressure of the second pressure source is smaller than the preset pressure of the first pressure source, the piston separates the second input channel from the output channel under the action of the pressure of the first pressure source. When the pressure of the second pressure source is equal to or larger than the preset pressure of the first pressure source, the piston moves towards the side away from the second end, and the output channel communicates with the second input channel.

Description

Technical Field

[0001] The utility model relates to the technical field of valve control, and particularly relates to a pressure control valve. Background Art

[0002] A pressure controller is a device that precisely controls the pressure of a reaction system in various different reaction system experiments, and can ensure the stability of the process, so it is widely used in the fields of chemical industry, pharmacy, laboratories, industrial production, etc.

[0003] Conventional pressure controllers mainly include a pressure sensor, a controller, and a regulating valve. The pressure sensor is used to detect the real-time pressure in the system. The controller receives the signal from the pressure sensor, compares it with the set pressure value, and then outputs a control signal to regulate the valve opening of the regulating valve, and can control the pressure by changing the flow rate of the fluid.

[0004] However, conventional pressure controllers basically focus on controlling gas pressure. In the scenario of controlling liquid pressure or gas-liquid mixture, the flow characteristics of the fluid are relatively complex, and the pressure signal feedback by the pressure sensor may have errors, making the pressure controller prone to pressure fluctuations and the stability of pressure control decreases. On the other hand, in the case of gas-liquid mixture, additional gas-liquid separators and pressure compensation systems are usually required for pressure control, and the operation is relatively complex. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pressure control valve, and the technical problem it solves is: how to improve the stability of pressure control and reduce the operation complexity.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions.

[0007] The utility model provides a pressure control valve, which comprises:

[0008] Valve housing, an active chamber is provided inside the valve housing, the active chamber has a first end and a second end arranged oppositely and a peripheral wall connecting the first end and the second end, a first input channel is opened at the first end, the first input channel is used to communicate with a first pressure source, a second input channel is opened at the second end, the second input channel is used to communicate with a second pressure source, an output channel is opened on the peripheral wall, and the output channel communicates with the outside; a piston, located inside the active chamber and movable between the first end and the second end, the piston separates the first input channel and the output channel so that the first input channel and the output channel are not communicated with each other; when the pressure of the second pressure source is less than the preset pressure of the first pressure source, the piston separates the second input channel and the output channel under the pressure of the first pressure source so that the second input channel and the output channel are not communicated with each other; when the pressure of the second pressure source is equal to or greater than the preset pressure of the first pressure source, the piston moves away from the second end under the pressure of the second pressure source and makes the output channel communicate with the second input channel.

[0009] In some embodiments of the present application, there is a gap between the outer wall of the piston and the peripheral wall of the active chamber, a first sealing member is sleeved outside the piston, and the first sealing member fits between the outer wall of the piston and the peripheral wall of the active chamber so that the first input channel and the output channel are not communicated with each other.

[0010] In some embodiments of the present application, a second sealing member is sleeved outside the piston, and when the pressure of the second pressure source is less than the preset pressure of the first pressure source, the piston fits the second end through the second sealing member.

[0011] In some embodiments of the present application, the active chamber includes a first cavity and a second cavity that are communicated with each other, the first cavity is respectively communicated with the first input channel and the output channel, the second cavity is communicated with the second input channel, and the cross-sectional width of the first cavity is greater than the cross-sectional width of the second cavity; the piston includes a first part and a second part that are axially connected, and the radial width of the first part is greater than the radial width of the second part, the first part is arranged in the first cavity, and the second part is arranged in the second cavity.

[0012] In some embodiments of the present application, when the pressure of the second pressure source is greater than the preset pressure of the first pressure source, the opening size of the output channel is positively correlated with the pressure difference between the second pressure source and the first pressure source.

[0013] In some embodiments of the present application, the valve housing includes a first housing and a second housing. An internal thread is provided on the inner peripheral wall of the first housing, and an external thread is provided on the outer peripheral wall of the second housing. The first housing and the second housing are screwed together, and an activity chamber is formed between the first housing and the second housing. A first input channel is provided in the first housing, and a second input channel and an output channel are provided in the second housing.

[0014] In some embodiments of the present application, a third seal is provided on the end face of the end of the first housing facing the second housing. When the first housing and the second housing are screwed together, the third seal is clamped between the first housing and the second housing.

[0015] In some embodiments of the present application, a first input joint and a second input joint are provided on the valve housing, and the first input joint and the second input joint are respectively communicated with the first input channel and the second input channel.

[0016] From the above technical solutions, it can be seen that the embodiments of the present utility model at least have the following advantages and positive effects:

[0017] In the pressure control valve of the embodiment of the present utility model, first, according to the actual requirements, the pressure of the first pressure source is set. In the initial state, the pressure of the second pressure source is less than the preset pressure of the first pressure source. The piston will fit against the second end under the action of the preset pressure of the first pressure source, forming a seal between the output channel and the second input channel, thereby preventing the internal fluid from being output to the outside. When the pressure of the second pressure source gradually rises and reaches or exceeds the pressure of the first pressure source, the thrust generated by the pressure from the second pressure source on the piston increases, and the piston begins to move away from the second end side, and the second input channel and the output channel are communicated. Therefore, the fluid inside the reaction vessel is allowed to pass through the second input channel and the output channel and is finally output to the outside. Thus, the piston can dynamically adjust its position according to the pressure difference between the first pressure source and the second pressure source to control the communication relationship between the output channel and the second input channel, and further can dynamically adjust the pressure of the second pressure source. When this pressure control valve is applied to control gas pressure, liquid pressure and gas-liquid mixed pressure, since it does not rely solely on the pressure signal feedback by the pressure sensor for pressure control, it can reduce the influence of the feedback error of the pressure signal on the stability of pressure control, and the overall structure of this pressure control valve is relatively simple, it can realize automatic pressure adjustment, and the operation is more convenient. Description of the Drawings

[0018] The various objects, features, and advantages of the present utility model will become more apparent by considering the following detailed description of the preferred embodiments of the present utility model in conjunction with the accompanying drawings. The accompanying drawings are only illustrative diagrams of the present utility model and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar components. Among them:

[0019] Figure 1 is a schematic structural diagram of a pressure control valve shown according to an exemplary embodiment.

[0020] Figure 2 is Figure 1 a schematic structural diagram of the valve housing in

[0021] Figure 3 is Figure 1 a schematic structural diagram of the piston in

[0022] Figure 4 is at Figure 1 a real-time curve graph of the second pressure source varying with the pressure of the first pressure source at the equilibrium state.

[0023] Figure 5 is at Figure 1 another real-time curve graph of the second pressure source varying with the pressure of the first pressure source at the equilibrium state.

[0024] The description of the reference numerals is as follows:

[0025] 1. Valve housing; 11. First housing; 12. Second housing; 13. Activity chamber; 131. First chamber; 132. Second chamber; 14. First end; 141. First input channel; 15. Second end; 151. Second input channel; 16. Peripheral wall; 161. Output channel; 17. First input joint; 18. Second input joint;

[0026] 2. Piston; 21. First part; 22. Second part; 23. First seal; 24. Second seal; 25. Third seal. Detailed implementation manners

[0027] Although the present utility model can be easily embodied in different forms of embodiments, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. At the same time, it can be understood that this specification should be regarded as an exemplary illustration of the principles of the present utility model and is not intended to limit the present utility model to what is described herein.

[0028] Accordingly, a feature pointed out in this specification will be used to illustrate one feature of an embodiment of the present utility model, rather than implying that each embodiment of the present utility model must have the illustrated feature. In addition, it should be noted that this specification describes many features. Although certain features may be combined to show possible system designs, these features may also be used in other combinations not explicitly described. Accordingly, unless otherwise stated, the illustrated combinations are not intended to be limiting.

[0029] In the embodiment shown in the drawings, the indication of directions (such as up, down, left, right, front, and back) is used to explain that the structures and movements of various elements of the present utility model are not absolute but relative. When these elements are in the positions shown in the drawings, these explanations are appropriate. If the descriptions of the positions of these elements change, then the indications of these directions also change accordingly.

[0030] Please refer to Figures 1 to 3 , a pressure control valve provided by an embodiment of the present utility model mainly includes a valve housing 1 and a piston 2. An active chamber 13 is provided inside the valve housing 1. The active chamber 13 has a first end 14 and a second end 15 arranged oppositely and a peripheral wall 16 connecting the first end 14 and the second end 15. A first input channel 141 is provided at the first end 14. The first input channel 141 is used to communicate with a first pressure source. A second input channel 151 is provided at the second end 15. The second input channel 151 is used to communicate with a second pressure source. An output channel 161 is provided on the peripheral wall 16. The output channel 161 communicates with the outside. The piston 2 is located inside the active chamber 13 and can move between the first end 14 and the second end 15. The piston 2 separates the first input channel 141 and the output channel 161, so that the first input channel 141 and the output channel 161 are not in communication with each other. When the pressure of the second pressure source is less than the preset pressure of the first pressure source, the piston 2 separates the second input channel 151 and the output channel 161 under the action of the preset pressure of the first pressure source, so that the second input channel 151 and the output channel 161 are not in communication with each other. When the pressure of the second pressure source is equal to or greater than the preset pressure of the first pressure source, the piston 2 moves towards the side away from the second end 15 under the action of the pressure of the second pressure source, and makes the output channel 161 communicate with the second input channel 151.

[0031] In the pressure control valve according to the embodiment of the present utility model, the first pressure source comes from an external fluid source, and the second pressure source comes from the inside of the reaction vessel. During use, first set the pressure of the first pressure source according to actual requirements. In the initial state, the pressure of the second pressure source is less than the preset pressure of the first pressure source. The piston 2 will fit against the second end 15 under the action of the preset pressure of the first pressure source, forming a blockage between the output channel 161 and the second input channel 151, thereby preventing the internal fluid from being output to the outside. When the pressure of the second pressure source gradually rises and reaches or exceeds the pressure of the first pressure source, the thrust generated by the pressure from the second pressure source on the piston 2 increases. The piston 2 begins to move towards the side away from the second end 15, and the second input channel 151 and the output channel 161 are connected. Therefore, the fluid inside the reaction vessel is allowed to pass through the second input channel 151 and the output channel 161 and is finally output to the outside. Thus, the piston 2 can dynamically adjust its position according to the pressure difference between the first pressure source and the second pressure source to control the connection relationship between the output channel 161 and the second input channel 151, and further can dynamically adjust the pressure of the second pressure source. When this pressure control valve is applied to control gas pressure, liquid pressure, and gas-liquid mixed pressure, since it does not solely rely on the pressure signal feedback from the pressure sensor for pressure control, it can reduce the influence of the feedback error of the pressure signal on the stability of pressure control, and the overall structure of this pressure control valve is relatively simple, capable of realizing automatic pressure adjustment and being more convenient to operate.

[0032] It can be conceived that when the pressure of the second pressure source is less than the preset pressure of the first pressure source, the second input channel 151 and the output channel 161 are not connected to each other. It can be that the piston 2 forms a blockage between the second input channel 151 and the active chamber 13, and the output channel 161 is connected to the active chamber 13. It can be that the second input channel 151 is connected to the active chamber 13, and the piston 2 forms a blockage between the output channel 161 and the active chamber 13. It can also be that the piston 2 forms blockages between the output channel 161 and the active chamber 13 and between the second input channel 151 and the active chamber 13 respectively.

[0033] In an embodiment where the piston 2 is movably disposed in the active chamber 13 and the first input channel 141 and the output channel 161 are not connected to each other, there is a gap between the outer wall of the piston 2 and the peripheral wall 16 of the active chamber 13. A first seal 23 is sleeved outside the piston 2, and the first seal 23 fits between the outer wall of the piston 2 and the peripheral wall 16 of the active chamber 13 to make the first input channel 141 and the output channel 161 not connected to each other.

[0034] The gap between the outer wall of the piston 2 and the peripheral wall 16 of the movable cavity 13 reduces the frictional resistance between the piston 2 and the peripheral wall 16 of the movable cavity 13, thereby making the movement of the piston 2 smoother. The first seal 23 ensures that an effective seal can always be maintained between the first input channel 141 and the output channel 161, enabling the external fluid source connected to the first input channel 141 to stably apply a preset pressure to the piston 2.

[0035] In an embodiment where the piston 2 fits against the second end 15 under the preset pressure of the first pressure source, a second seal 24 is sleeved outside the piston 2. When the pressure of the second pressure source is less than the preset pressure of the first pressure source, the piston 2 fits against the second end 15 through the second seal 24.

[0036] The design of the second seal 24 ensures that an effective seal can be formed between the second input channel 151 and the movable cavity 13 when the pressure of the second pressure source is insufficient. Since there is a gap between the outer wall of the piston 2 and the peripheral wall 16 of the movable cavity 13, the movable cavity 13 and the output channel 161 are in a communicating state. As the pressure of the second pressure source increases, the piston 2 can drive the second seal 24 to disengage from the second end 15, enabling the second input channel 151 and the movable cavity 13 to communicate with each other. Thus, the communication between the output channel 161, the movable cavity 13, and the second input channel 151 is achieved, and the internal fluid can be output through the output channel 161.

[0037] In other embodiments, the outer wall of the piston 2 fits against the peripheral wall 16 of the movable cavity 13 and can directly close or open the output channel 161 when moving. The outer wall of the piston 2 fits against the peripheral wall 16 of the movable cavity 13, and the piston 2 forms a blockage between the output channel 161 and the movable cavity 13. The piston 2 can open or close the output channel 161 when moving. However, such a structure will result in a relatively large frictional force between the piston 2 and the peripheral wall 16 of the movable cavity 13, which is not conducive to the smooth movement of the piston 2 and has a poor sealing performance.

[0038] In an embodiment where the piston 2 is movably disposed in the movable cavity 13, the movable cavity 13 includes a first cavity 131 and a second cavity 132 that are connected and communicate with each other. The first cavity 131 is respectively connected to the first input channel 141 and the output channel 161, the second cavity 132 is connected to the second input channel 151, and the cross-sectional width of the first cavity 131 is greater than the cross-sectional width of the second cavity 132. The piston 2 includes an axially connected first part 21 and a second part 22, and the radial width of the first part 21 is greater than the radial width of the second part 22. The first part is disposed in the first cavity 131, and the second part 22 is disposed in the second cavity 132.

[0039] The second part 22 is disposed within the second cavity 132, and the second cavity 132 communicates with the second input channel 151. Therefore, the pressure of the second pressure source can directly act on the end face of the second part 22. Since the diameter width of the second part 22 is small, the area of the end face of the second part 22 is small. According to the principle of pressure distribution, the pressure effect on the smaller stress area (i.e., the end face of the second part 22) is more significant. When the pressure of the second pressure source is equal to or greater than the preset pressure of the external fluid source, the piston 2 is more likely to start moving, thereby improving the starting performance of the valve. On the other hand, the fit between the second cavity 132 and the second part 22 provides a guiding effect for the overall movement of the piston 2, making the movement of the piston 2 smoother and more accurate.

[0040] In this embodiment, the first seal 23 is sleeved outside the first part 21 and fits between the outer wall of the first part 21 and the peripheral wall of the first cavity 131. The second seal 24 is sleeved outside the second part 22, and when the pressure of the second pressure source is less than the preset pressure of the first pressure source, the second seal 24 is clamped between the first part 21 and the second end 15.

[0041] In this embodiment, when the pressure of the second pressure source is greater than the preset pressure of the first pressure source, the opening size of the output channel 161 is positively correlated with the pressure difference between the second pressure source and the first pressure source. The piston 2 can dynamically adjust the opening size of the output channel 161 according to the change of the pressure difference, thereby achieving more precise pressure control.

[0042] In this embodiment, the valve housing 1 includes a first housing 11 and a second housing 12. The inner peripheral wall of the first housing 11 is provided with internal threads, and the outer peripheral wall of the second housing 12 is provided with external threads. The first housing 11 is screwed to the second housing 12, and an activity cavity 13 is formed between the first housing 11 and the second housing 12. The first input channel 141 is disposed in the first housing 11, and the second input channel 151 and the output channel 161 are disposed in the second housing 12. The split design of the valve housing 1 facilitates the assembly and maintenance of the overall structure, and at the same time facilitates the replacement and repair of internal components. It can be envisioned that in other embodiments, the output channel 161 can also be disposed in the first housing 11.

[0043] In a further embodiment, a third seal 25 is provided on the end face of the second housing 12 facing the first housing 11. When the first housing 11 is screwed to the second housing 12, the third seal 25 is clamped between the first housing 11 and the second housing 12.

[0044] The introduction of the third seal 25 enhances the sealing performance between the first housing 11 and the second housing 12, reduces the influence of the external environment on the inside of the activity cavity 13, and thus improves the working stability and reliability of the pressure control valve.

[0045] In this embodiment, an annular groove is formed on the end face of one end of the first housing 11 facing the second housing 12. The third seal 25 is annular and is embedded in the annular groove.

[0046] Please refer to Figure 1 and Figure 2 , in the above embodiments, the valve housing 1 is provided with a first input joint 17 and a second input joint 18. The first input joint 17 and the second input joint 18 are respectively communicated with the first input channel 141 and the second input channel 151. The first input joint 17 and the second input joint 18 can improve the convenience and reliability of connection, facilitate the quick connection of the pressure control valve to the first pressure source and the reaction vessel, and reduce the installation time.

[0047] Please refer to Figure 4 and Figure 5 , Figure 4 and Figure 5 discloses a real-time curve graph of the change of the second pressure source with the pressure of the first pressure source when the pressure control valve is in the balanced state. Among them, the light-colored curve reflects the pressure change of the first pressure source, and the dark-colored curve reflects the pressure change of the second pressure source.

[0048] According to Figure 4 and Figure 5 it is easy to obtain that in the balanced state, when the pressure value of the first pressure source is certain, as time goes by, the pressure value of the second pressure source can also be maintained near a stable value. Therefore, under the control of the pressure control valve in the embodiment of the present utility model, the air pressure in the reaction vessel can continuously be in a stable and balanced state, thereby verifying that the stability of pressure control can be improved through the pressure control valve.

[0049] Although the present utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present utility model can be embodied in many forms without departing from the spirit or essence of the utility model, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly interpreted within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pressure control valve, characterized in that: include: A valve housing, wherein an active cavity is provided in the valve housing, wherein the active cavity has a first end and a second end that are arranged opposite to each other and a peripheral wall connecting the first end and the second end, wherein the first end is provided with a first input channel, the first input channel is used to communicate with a first pressure source, the second end is provided with a second input channel, the second input channel is used to communicate with a second pressure source, and an output channel is provided on the peripheral wall, the output channel is communicated with the outside; a piston located in the movable chamber and movable between the first end and the second end, wherein the piston separates the first input channel from the output channel so that the first input channel and the output channel are not connected to each other; When the pressure of the second pressure source is less than the preset pressure of the first pressure source, the piston separates the second input channel from the output channel under the pressure of the first pressure source, so that the second input channel and the output channel are not connected to each other; When the pressure of the second pressure source is equal to or greater than the preset pressure of the first pressure source, the piston moves away from the second end under the pressure of the second pressure source and connects the output channel with the second input channel.

2. The pressure control valve according to claim 1, characterized in that: There is a gap between the outer wall of the piston and the peripheral wall of the active chamber. A first seal is sleeved on the outer side of the piston. The first seal is attached between the outer wall of the piston and the peripheral wall of the active chamber to prevent the first input channel and the output channel from communicating with each other.

3. The pressure control valve according to claim 2, characterized in that: A second sealing member is sleeved on the outer side of the piston. When the pressure of the second pressure source is less than the preset pressure of the first pressure source, the piston is attached to the second end wall through the second sealing member.

4. The pressure control valve according to claim 1, characterized in that: The active cavity comprises a first cavity and a second cavity which are connected to each other, the first cavity is connected to the first input channel and the output channel respectively, the second cavity is connected to the second input channel, and the cross-sectional width of the first cavity is greater than the cross-sectional width of the second cavity; The piston comprises a first part and a second part which are axially connected, and the diameter width of the first part is greater than the diameter width of the second part. The first part is arranged in the first cavity, and the second part is arranged in the second cavity.

5. The pressure control valve according to claim 1, characterized in that: When the pressure of the second pressure source is greater than the preset pressure of the first pressure source, the opening size of the output channel is positively correlated with the pressure difference between the second pressure source and the first pressure source.

6. The pressure control valve according to claim 1, characterized in that: The valve housing includes a first housing and a second housing, the inner circumferential wall of the first housing is provided with an internal thread, the outer circumferential wall of the second housing is provided with an external thread, the first housing is threadedly connected to the second housing, and an active cavity is formed between the first housing and the second housing, the first input channel is provided in the first housing, and the second input channel and the output channel are provided in the second housing.

7. The pressure control valve according to claim 6, characterized in that: A third sealing member is provided on an end surface of the first shell facing the second shell. When the first shell is screwed to the second shell, the third sealing member is sandwiched between the first shell and the second shell.

8. The pressure control valve according to claim 1, characterized in that: A first input connector and a second input connector are provided on the valve housing, and the first input connector and the second input connector are communicated with the first input channel and the second input channel respectively.

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