Pneumatic control valve

Abstract

The utility model innovatively provides a pneumatic control valve which comprises a valve body, an air inlet channel and an air outlet channel are arranged on the valve body, a valve element is arranged in the valve body, an air conveying channel penetrating through the valve element is arranged on the valve element, and the valve element can move in the valve body to be switched between a first position and a second position in a reciprocating mode. The first position is that the outer side wall of the valve element blocks the air inlet channel or the air outlet channel, and the second position is that the air conveying channel of the valve element communicates with the air inlet channel and the air outlet channel. The utility model has the advantages that a certain flow rate is achieved quickly from plugging to opening, circulation is realized through the gas transmission channel, the delay error is reduced, the internal space occupation of the valve body can be reduced, and the volume of the whole valve is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of valve body structure, and more specifically to a pneumatic control valve. Background Technology

[0002] As an important component in fluid control systems, pneumatic valves typically have a two-way or three-way structure. They control the flow of gas by controlling the inlet and outlet channels. Currently, the valve core of pneumatic valves is mainly a plug. The movement of the plug opens or closes the flow channel. However, with this plug structure, the time it takes for the gas flow to go from low to high to the required level during the process of sealing and opening is relatively long. The plug needs to move a relatively long distance to completely avoid the gas flow, and a large internal space is also required to store the plug for this purpose. In addition, the internal structure of pneumatic valves with plug structures is complex and costly, making them difficult to meet. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pneumatic control valve to overcome the above-mentioned defects in the existing technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A pneumatic control valve includes a valve body with an air inlet channel and an air outlet channel. A valve core is provided inside the valve body, and an air supply channel is provided through the valve core. The valve core can move within the valve body and reciprocate between a first position and a second position. In the first position, the outer wall of the valve core blocks the air inlet channel or the air outlet channel. In the second position, the air supply channel of the valve core connects the air inlet channel and the air outlet channel.

[0006] Furthermore, an air chamber is formed between the valve body and the valve core. A piston ring is provided on the outer surface of the valve core, and the piston ring is located in the air chamber. Air heads connected to the air chamber are respectively provided at both ends of the air chamber in the direction of valve core movement.

[0007] Furthermore, the piston ring has stepped portions at both ends in the direction of movement at the drive end.

[0008] Furthermore, the valve body is provided with an auxiliary component, which is used to provide a reset force acting on the valve core so that the valve core is reset from the second position to the first position.

[0009] Furthermore, the auxiliary component is a compression spring, one end of which is connected to the valve body, and the other end is connected to the end of the valve core near the air outlet channel.

[0010] Furthermore, a limiting seat is provided in the gas delivery channel, and one end of the compression spring is connected to the limiting seat.

[0011] Furthermore, the diameter of the limiting seat facing a portion of the air supply channel is greater than or equal to the inner diameter of the compression spring.

[0012] Furthermore, the valve core is a tubular component.

[0013] Furthermore, both the air intake channel and the air outlet channel are arranged perpendicular to the air delivery channel.

[0014] Furthermore, the valve body is provided with a first sealing ring, a second sealing ring and a third sealing ring. The first sealing ring and the second sealing ring are located at the end of the air chamber near the air supply channel, and the first sealing ring and the second sealing ring are respectively located at the two ends of the air supply channel in the direction of valve core movement. The third sealing ring is located at the end of the air chamber near the air outlet channel.

[0015] The beneficial effects of this utility model are as follows: By reciprocating between the first and second positions of the valve core, the air supply inside the valve body can be blocked or unblocked. Specifically, the valve core has an air supply channel that runs through it. When blocked, the valve core blocks the air inlet or outlet channel through its outer wall. When unblocked, the air supply channel connects the air inlet and outlet channels. Compared with the traditional plug structure, this utility model can quickly achieve a certain flow rate from blocking to opening, and the air supply channel itself can achieve circulation, reducing delay error and reducing the internal space occupied by the valve body, thus reducing the overall valve volume. Attached Figure Description

[0016] Figure 1 This is an overall sectional view of the present invention;

[0017] Reference numerals in the attached drawings: 1. Valve body; 2. Valve core; 3. Inlet passage; 4. Outlet passage; 5. Gas delivery passage; 6. Gas chamber; 7. Piston ring; 8. Gas head; 9. Stepped part; 10. Compression spring; 11. Limiting seat; 12. First sealing ring; 13. Second sealing ring; 14. Third sealing ring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0022] Because the valve core 2 of current pneumatic control valves is mainly a plug, the flow channel is opened or closed by the movement of the plug. However, in the process of sealing and opening with this plug structure, the delay in the gas flow rate from low to high is relatively long. The plug needs to move a relatively long distance to completely avoid the gas flow, and a large internal space is also required to store the plug for this purpose. In addition, the internal structure of the pneumatic control valve with the plug structure is complex and costly, making it difficult to meet the requirements. Therefore, this utility model designs a pneumatic control valve, such as... Figure 1 As shown, the device includes a valve body 1, which has an inlet channel 3 and an outlet channel 4. A valve core 2 is located inside the valve body 1, and an air delivery channel 5 extends through the valve core 2. The valve core 2 is a tubular component, which can be a round tube, square tube, or other tubular shapes. Both the inlet channel 3 and the outlet channel 4 are perpendicular to the air delivery channel 5, meaning the valve core 2 is horizontally positioned, the air delivery channel 5 is horizontal, and the inlet channel 3 and outlet channel 4 are vertical. The valve core 2 can move within the valve body 1, reciprocating between a first position and a second position. The first position... The outer wall of valve core 2 is blocked to seal the air inlet channel 3 or the air outlet channel 4. The second position is the air supply channel 5 of valve core 2, which connects the air inlet channel 3 and the air outlet channel 4. Under normal circumstances, valve core 2 is in the first position. When the pneumatic control valve needs to be used, valve core 2 moves from the first position to the second position under the drive of other power. Compared with the traditional plug structure, valve core 2 can quickly achieve a certain flow rate from blocking to opening, and the air is circulated by its own air supply channel 5, which reduces the delay error and can also reduce the internal space occupied by valve body 1 and reduce the overall valve volume.

[0023] Example 1:

[0024] The power source for the movement of the valve core 2 includes pneumatic, hydraulic, and mechanical power. This utility model adopts a pneumatic method, specifically, as follows: Figure 1 As shown, a gas chamber 6 is formed between the valve body 1 and the valve core 2. A piston ring 7 is provided on the outer surface of the valve core 2, and the piston ring 7 is located in the gas chamber 6. At both ends of the gas chamber 6 in the direction of movement of the valve core 2, there are gas heads 8 connected to the gas chamber 6. The gas head 8 near the air intake channel 3 is defined as the first gas head 8, and the other gas head 8 is defined as the second gas head 8. When the valve core 2 is in the first position, the piston ring 7 is pressed against the wall of the gas chamber 6 on the side of the first gas head 8. When it is necessary to push the valve core 2 to the second position, the first gas head 8 injects air into the gas chamber 6, pushing the piston ring 7 to move towards the second gas head 8. Before this, the second gas head 8 is in a depressurized state, that is, the second gas head 8 is open. Conversely, when resetting, the second gas head 8 injects air, and the first gas head 8 is open.

[0025] In addition, in order to facilitate the injection of air into the air chamber 6 by the first air head 8 or the second air head 8 so as to push the piston ring 7, the piston ring 7 is provided with stepped portions 9 at both ends in the direction of movement of the driving end. When the piston ring 7 moves to be close to the inner wall of the air chamber 6, a small cavity exists between the piston ring 7 and the inner wall of the air chamber 6 under the action of the stepped portions 9, so that the gas introduced by the air head 8 can enter and ensure that the piston ring 7 is pushed smoothly.

[0026] Because the air pressure at the intake passage 3 is relatively high, and when the valve core 2 is in the first position, the valve core 2 blocks the intake passage 3. To ensure that the air in the intake passage 3 does not leak into the air chamber 6 or that the air in the air chamber 6 does not leak into the air delivery passage 5, such as... Figure 1 As shown, the valve body 1 is provided with a first sealing ring 12, a second sealing ring 13 and a third sealing ring 14. The first sealing ring 12 and the second sealing ring 13 are located at one end of the air chamber 6 near the air supply channel 5, and the first sealing ring 12 and the second sealing ring 13 are respectively located at both ends of the air supply channel 5 in the direction of movement of the valve core 2. The third sealing ring 14 is located at one end of the air chamber 6 near the air outlet channel 4.

[0027] Example 2:

[0028] Based on Example 1, in order to achieve rapid reset of valve core 2 from the first position to the second position, as follows: Figure 1 As shown, the valve body 1 is provided with an auxiliary component. The auxiliary component is used to provide a reset force on the valve core 2 so that the valve core 2 is reset from the second position to the first position. Optimally, the auxiliary component is a compression spring 10. One end of the compression spring 10 is connected to the valve body 1, and the other end is connected to the end of the valve core 2 near the air outlet channel 4. That is, the compression spring 10 presses against the end face of the valve core 2 to achieve the purpose of pressing the valve core 2.

[0029] Furthermore, in order to ensure the stability of the pressure valve core 2, a limiting seat 11 is provided in the air supply channel 5, that is, the pressure spring 10 extends into the air supply channel 5 and one end presses against the limiting seat 11.

[0030] Furthermore, in order to avoid the compression spring 10 obstructing the flow rate in the air delivery channel 5, the diameter of the part of the air delivery channel 5 facing the intake channel 3 of the limiting seat 11 is greater than or equal to the inner diameter of the compression spring 10, and the limiting seat 11 is located at the junction of the large-diameter part and the small-diameter part of the air delivery channel 5.

[0031] Because the air pressure at the intake passage 3 is relatively high, and when the valve core 2 is in the first position, the valve core 2 blocks the intake passage 3. To ensure that the air in the intake passage 3 does not leak into the air chamber 6 or that the air in the air chamber 6 does not leak into the air delivery passage 5, such as... Figure 1 As shown, the valve body 1 is provided with a first sealing ring 12, a second sealing ring 13 and a third sealing ring 14. The first sealing ring 12 and the second sealing ring 13 are located at one end of the air chamber 6 near the air supply channel 5, and the first sealing ring 12 and the second sealing ring 13 are respectively located at both ends of the air supply channel 5 in the direction of movement of the valve core 2. The third sealing ring 14 is located at one end of the air chamber 6 near the air outlet channel 4.

[0032] Example 3:

[0033] This utility model also includes the air chamber 6 and piston ring 7 in Embodiment 1, but there is only one air head 8, which is set at one end of the air chamber 6 near the air intake channel 3. In addition, the same auxiliary components as in Embodiment 2 are also provided. When the valve core 2 is in the first position, the spring 10 provides elastic force to hold the valve core 2. When the valve core 2 needs to move to the second position, the air head 8 injects air to push the piston ring 7. At this time, the spring 10 is compressed. When it needs to be reset, the air head 8 releases pressure and opens. There is no pressure in the air chamber 6 to push the piston ring 7. The spring 10 can push the valve core 2 back to the first position.

[0034] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A pneumatic control valve, comprising a valve body (1), wherein the valve body (1) is provided with an air inlet channel (3) and an air outlet channel (4), characterized in that: The valve body (1) is provided with a valve core (2), and the valve core (2) is provided with an air supply channel (5) that passes through the valve core (2). The valve core (2) can move within the valve body (1) and reciprocate between a first position and a second position. The first position is where the outer wall of the valve core (2) blocks the air inlet channel (3) or the air outlet channel (4). The second position is where the air supply channel (5) of the valve core (2) connects the air inlet channel (3) and the air outlet channel (4).

2. The pneumatic control valve according to claim 1, characterized in that: A gas chamber (6) is formed between the valve body (1) and the valve core (2). A piston ring (7) is provided on the outer side of the valve core (2), and the piston ring (7) is located in the gas chamber (6). At both ends of the gas chamber (6) in the direction of movement of the valve core (2), there are air heads (8) connected to the gas chamber (6).

3. The pneumatic control valve according to claim 2, characterized in that: The piston ring (7) has stepped portions (9) at both ends in the direction of movement at the drive end.

4. A pneumatic control valve according to claim 1 or 3, characterized in that: The valve body (1) is provided with an auxiliary component, which is used to provide a reset force acting on the valve core (2) so that the valve core (2) is reset from the second position to the first position.

5. The pneumatic control valve according to claim 4, characterized in that: The auxiliary component is a compression spring (10), one end of which is connected to the valve body (1), and the other end is connected to the valve core (2) near the air outlet channel (4).

6. The pneumatic control valve according to claim 5, characterized in that: The gas delivery channel (5) is provided with a limiting seat (11), and one end of the compression spring (10) is connected to the limiting seat (11).

7. The pneumatic control valve according to claim 6, characterized in that: The diameter of the limiting seat (11) facing a portion of the air delivery channel (5) of the air intake channel (3) is greater than or equal to the inner diameter of the compression spring (10).

8. The pneumatic control valve according to claim 7, characterized in that: The valve core (2) is a tubular component.

9. A pneumatic control valve according to claim 8, characterized in that: The air intake channel (3) and the air outlet channel (4) are both arranged perpendicularly to the air delivery channel (5).

10. A pneumatic control valve according to claim 2, characterized in that: The valve body (1) is provided with a first sealing ring (12), a second sealing ring (13) and a third sealing ring (14). The first sealing ring (12) and the second sealing ring (13) are located at one end of the air chamber (6) near the air supply channel (5), and the first sealing ring (12) and the second sealing ring (13) are respectively located at both ends of the air supply channel (5) in the direction of movement of the valve core (2). The third sealing ring (14) is located at one end of the air chamber (6) near the air outlet channel (4).

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