Air flow on-off valve

Abstract

The utility model belongs to the technical field of gas path control valves, and particularly provides a gas flow on-off valve. The air flow on-off valve aims at solving the problem that when an existing air flow on-off valve is closed, the air pressure difference pressure borne by a valve element assembly is large. Therefore, the airflow on-off valve comprises a valve body assembly and a valve element assembly. The valve body assembly is provided with an air inlet, an air outlet and an air flow on-off control cavity communicating the air inlet with the air outlet. The valve element assembly comprises a valve rod and a valve plug movably installed in the air flow on-off control cavity in the axial direction of the valve rod, the valve plug is used for closing and opening the air inlet and dividing the air flow on-off control cavity into an air guide area and a pressure equalizing area, and the air guide area is communicated with the air inlet and the air outlet. And a pressure equalizing channel for communicating the gas guide area with the pressure equalizing area is defined in the valve element assembly, so that high-pressure gas at the gas inlet is introduced into the pressure equalizing area when the gas inlet is closed by the valve plug, and the pressure difference between the two axial ends of the valve plug is reduced. The utility model solves the technical problems.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic control valve technology, and specifically provides a pneumatic shut-off valve. Background Technology

[0002] In the automotive industry, airflow cut-off valves are a crucial component of control systems, widely used in various vehicle subsystems, including but not limited to suspension and braking systems. Particularly in automotive suspension systems, airflow cut-off valves play a key role in adjusting suspension damping and optimizing ride stability and handling performance. Airflow cut-off valves typically adjust the stiffness and damping characteristics of the suspension system by controlling the flow of air to adapt to different road conditions and driving needs.

[0003] Existing pneumatic shut-off valves generally consist of a valve body assembly and a valve core assembly. The valve body assembly has an inlet and an outlet. The valve core assembly controls the opening and closing of the inlet and outlet. When the inlet and outlet are connected, the pressure difference between them is zero, and the pressure applied to the valve core assembly is relatively small. When the inlet and outlet are disconnected, the high-pressure gas at the inlet applies a large pressure difference to the valve core assembly. Therefore, to ensure that the valve core assembly can block the connection between the inlet and outlet, a large holding force needs to be applied to the valve core assembly to counteract this pressure difference. This holding force is usually the elastic force generated by a spring or the magnetic force generated by an electromagnetic coil. If the holding force is the elastic force generated by a spring, the opening resistance of the pneumatic shut-off valve is large, affecting its performance. If the holding force is the magnetic force generated by an electromagnetic coil, it requires more electrical energy, increasing energy consumption and causing significant heat generation. Utility Model Content

[0004] One objective of this invention is to solve the problem that the valve core assembly experiences a large pressure difference when the existing air flow shut-off valve is closed.

[0005] To achieve the above objectives, this utility model provides a pneumatic shut-off valve, comprising:

[0006] The valve body assembly is provided with an air inlet for connecting to an upstream air path, an air outlet for connecting to a downstream air path, and an air flow cut-off control chamber that connects the air inlet and the air outlet.

[0007] The valve core assembly includes a valve plug movably mounted axially within the airflow cutoff control chamber. The valve plug is used to close and open the air inlet and divide the airflow cutoff control chamber into a guiding zone and a pressure equalization zone, the guiding zone being connected to the air inlet and the air outlet, respectively. The valve core assembly defines a pressure equalization channel connecting the guiding zone and the pressure equalization zone, so as to introduce high-pressure gas at the air inlet into the pressure equalization zone when the valve plug closes the air inlet, thereby reducing the pressure difference across the axial ends of the valve plug.

[0008] Optionally, the valve body assembly includes an electromagnetic coil; the valve core assembly further includes a valve stem fixedly connected to or integrally formed with the valve plug and a movable magnetic yoke fixedly connected to or integrally formed with the valve stem; the movable magnetic yoke is attracted by the electromagnetic force generated by the electromagnetic coil to force the valve core assembly to move to a position that moves the valve plug to close or open the air inlet.

[0009] Optionally, the valve plug is provided with a non-circular hole extending along its axial direction, the valve stem is inserted into the non-circular hole and abuts against the peripheral wall of the non-circular hole; the pressure equalization channel is located in the non-circular hole and is jointly defined by the valve plug and the valve stem.

[0010] Optionally, the non-circular orifice includes a central orifice adapted to the valve stem and a wing orifice located radially outward of the central orifice; the pressure equalization channel is formed within the wing orifice.

[0011] Optionally, the valve body assembly further includes a fixed magnetic yoke; the pneumatic shut-off valve is configured such that the magnetic field generated when the electromagnetic coil is energized acts simultaneously on the movable magnetic yoke and the fixed magnetic yoke, so that the movable magnetic yoke moves toward the fixed magnetic yoke.

[0012] Optionally, the valve stem passes through the fixed magnetic yoke and is clearance-fitted with the fixed magnetic yoke to allow gas to flow between the two axial sides of the fixed magnetic yoke.

[0013] Optionally, the valve body assembly further includes a valve seat, which, together with the fixed magnetic yoke, defines the airflow cut-off control chamber; the air inlet is formed at the axial end of the valve seat away from the fixed magnetic yoke; the air outlet is formed on the circumferential sidewall of the valve seat; the valve seat is provided with a conical ring at the air inlet, which can seal against the valve plug and thus close the air inlet.

[0014] Optionally, the valve plug is provided with an end face sealing ring on the side near the conical ring, so that the valve plug can seal against the conical ring through the end face sealing ring.

[0015] Optionally, a shock-absorbing member is provided on the side of the valve plug away from the conical ring, so that when the valve plug opens the air inlet, it abuts against the fixed magnetic yoke through the shock-absorbing member, thereby weakening the impact force of the valve plug on the fixed magnetic yoke.

[0016] Optionally, the air flow cut-off valve further includes a return spring disposed between the valve body assembly and the valve core assembly, the return spring being used to drive the valve core assembly to a position that opens or closes the air inlet.

[0017] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this utility model, by arranging the valve plug of the valve core assembly within the airflow cut-off control chamber of the valve body assembly, the airflow cut-off control chamber is divided into an air guiding zone and a pressure equalization zone. By connecting the air guiding zone to both the inlet and outlet, the airflow entering through the inlet can flow to the outlet via the air guiding zone. By defining a pressure equalization channel connecting the air guiding zone and the pressure equalization zone within the valve core assembly, when the valve plug closes the inlet, the high-pressure gas at the inlet can be introduced into the pressure equalization zone through this pressure equalization channel, thereby reducing the pressure difference across the axial ends of the valve plug, that is, reducing the pressure difference experienced by the valve core assembly.

[0018] Other beneficial effects of this utility model will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improvement purpose, features and advantages of this utility model. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, some embodiments of this utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the same reference numerals may indicate the same or similar components or parts in different drawings; the drawings of this utility model are not necessarily drawn to scale. In the drawings:

[0020] Figure 1 This is an exploded view (first axonometric view) of the gas flow shut-off valve in some embodiments of this utility model;

[0021] Figure 2 This is an exploded view (second isometric view) of the pneumatic shut-off valve in some embodiments of this utility model;

[0022] Figure 3 This is a perspective view (first axonometric view) of the pneumatic shut-off valve in some embodiments of this utility model;

[0023] Figure 4 This is a perspective view (second axonometric view) of the pneumatic shut-off valve in some embodiments of this utility model;

[0024] Figure 5 yes Figure 4 Cross-sectional view of the middle valve body assembly along the AA direction;

[0025] Figure 6 yes Figure 4 Cross-sectional view of the central valve core assembly along the AA direction;

[0026] Figure 7 yes Figure 4 A cross-sectional view of the gas shut-off valve along the AA direction (open state);

[0027] Figure 8 yes Figure 4 A cross-sectional view of the gas flow shut-off valve along the AA direction (closed state).

[0028] Explanation of reference numerals in the attached figures:

[0029] 001. Pneumatic shut-off valve;

[0030] 100. Valve body assembly; 101. Air inlet; 102. Air outlet; 103. Air flow control chamber; 1031. Air guide zone; 1032. Pressure equalization zone; 110. Electromagnetic coil; 120. Fixed magnetic yoke; 131. Valve seat; 1311. Conical ring; 132. Valve cover; 140. Housing; 150. Power plug; 160. Valve sleeve; 170. Dynamic sealing assembly; 180. Installed sealing ring;

[0031] 200, Valve core assembly; 201, Pressure equalization channel; 210, Valve stem; 220, Valve plug; 2201, Non-circular bore; 22011, Central bore; 22012, Wing bore; 221, End face seal ring; 222, Vibration damping component; 230, Movable magnetic yoke;

[0032] 300. Return spring;

[0033] r, radial; o, axial. Detailed Implementation

[0034] Those skilled in the art should understand that the embodiments described below are merely some embodiments of the present invention, and not all embodiments of the present invention. These embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0035] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the corresponding device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. For example, unless otherwise specified, the terms "installation," "connection," "joining," and "fixing" can specifically refer to any feasible connection form such as bolt connection, screw connection, welding, insertion, riveting, fusion welding, or snap-fit.

[0037] like Figures 1 to 4 As shown, in some embodiments of this utility model, the pneumatic shut-off valve 001 includes a valve body assembly 100 and a valve core assembly 200.

[0038] like Figures 1 to 5 As shown, the valve body assembly 100 is provided with an air inlet 101 for connecting to the upstream air path, an air outlet 102 for connecting to the downstream air path, and an air flow cut-off control chamber 103 that connects the air inlet 101 and the air outlet 102.

[0039] like Figures 1 to 8 As shown, the valve core assembly 200 includes a valve stem 210 and a valve plug 220 movably mounted in the airflow cutoff control chamber 103 along its axial direction o. The valve plug 220 is used to close and open the air inlet 101 and divides the airflow cutoff control chamber 103 into a guide zone 1031 and a pressure equalization zone 1032. The guide zone 1031 is connected to the air inlet 101 and the air outlet 102, respectively. The valve core assembly 200 defines a pressure equalization channel 201 that connects the guide zone 1031 and the pressure equalization zone 1032, so that when the valve plug 220 closes the air inlet 101, the high-pressure gas at the air inlet 101 is introduced into the pressure equalization zone 1032, thereby reducing the pressure difference across the two ends of the valve plug 220 along its axial direction o.

[0040] Those skilled in the art will understand that by arranging the valve plug 220 of the valve core assembly 200 within the airflow cut-off control chamber 103 of the valve body assembly 100, the airflow cut-off control chamber 103 is divided into an air guiding zone 1031 and a pressure equalization zone 1032. By connecting the air guiding zone 1031 to the air inlet 101 and the air outlet 102 respectively, the airflow flowing into the air inlet 101 can flow to the air outlet 102 via the air guiding zone 1031. By defining a pressure equalization channel 201 connecting the air guiding zone 1031 and the pressure equalization zone 1032 in the valve core assembly 200, when the valve plug 220 closes the air inlet 101, the high-pressure gas at the air inlet 101 can be introduced into the pressure equalization zone 1032 through the pressure equalization channel 201, thereby reducing the pressure difference across the two ends of the valve plug 220 along the axial direction, that is, reducing the pressure difference pressure experienced by the valve core assembly 200.

[0041] like Figure 5 As shown, in some embodiments of this utility model, the valve body assembly 100 includes an electromagnetic coil 110, a fixed magnetic yoke 120, a valve seat 131, a valve cover 132, a housing 140, a power plug 150, a valve sleeve 160, a dynamic sealing assembly 170, and a mounting sealing ring 180, etc.

[0042] The electromagnetic coil 110 provides electromagnetic force to the valve core assembly 200, driving its movement. The fixed magnetic yoke 120 confines the magnetic field generated by the electromagnetic coil 110, improving its efficiency. The valve seat 131 and valve cover 132 are located at opposite ends of the housing 140 along its axial direction (o), and are fixedly connected to the housing 140 to encapsulate and protect components such as the electromagnetic coil 110, fixed magnetic yoke 120, valve sleeve 160, and dynamic sealing assembly 170. A power plug 150 is installed on the valve cover 132 and electrically connected to the electromagnetic coil 110 to provide power. The valve sleeve 160 accommodates a portion of the valve core assembly 200 and guides its axial movement (o). A sliding seal is formed between the dynamic sealing assembly 170 and the valve core assembly 200 to prevent gas leakage from the high-pressure side to the low-pressure side along its axial direction (o). The sealing ring 180 is installed to seal the valve body assembly 100 with the object being installed (e.g., a metal block with a insertion hole, a pipe, etc.) to prevent high-pressure gas leakage.

[0043] like Figure 5As shown, with the valve body assembly 100 assembled, the valve seat 131 and valve cover 132 are fixedly mounted to both ends of the housing 140 along the axial direction o. This fixed connection can be an interference fit, threaded connection, welding, or it can be connected by other parts, such as by snap-fit ​​rings. The electromagnetic coil 110 is disposed inside the housing 140, the fixed magnetic yoke 120 is disposed between the valve seat 131 and the electromagnetic coil 110, the power plug 150 is installed at the valve cover 132, and the valve sleeve 160 is disposed inside the electromagnetic coil 110. The dynamic sealing assembly 170 is disposed along its axial direction o between the valve seat 131 and the fixed magnetic yoke 120 and is clamped by the valve seat 131 and the fixed magnetic yoke 120. Sealing rings 180 are respectively provided on the outer sides of the valve seat 131 and the housing 140.

[0044] from Figure 5 As can be seen from the figure, in some embodiments of this utility model, the valve seat 131 and the fixed magnetic yoke 120 together define the airflow cutoff control cavity 103. An air inlet 101 is formed at the axial end of the valve seat 131 away from the fixed magnetic yoke 120, and an air outlet 102 is formed on the circumferential sidewall of the valve seat 131. The valve seat 131 has an inwardly protruding annular structure (not marked in the figure) between the air inlet 101 and the air outlet 102 in the axial direction. A conical ring 1311 is provided on the side of this annular structure closest to the fixed magnetic yoke 120. This conical ring 1311 abuts against the valve core assembly 200, thereby closing the air inlet 101.

[0045] Furthermore, in other embodiments of this utility model, those skilled in the art may omit at least one of the following components as needed: fixed magnetic yoke 120, valve seat 131, valve cover 132, housing 140, power plug 150, valve sleeve 160, dynamic sealing assembly 170, and mounting sealing ring 180. For example, the valve sleeve 160 may be omitted.

[0046] like Figure 1 , Figure 2 and Figure 6 As shown, in some embodiments of this utility model, the valve core assembly 200 may further include a movable magnetic yoke 230. This movable magnetic yoke 230 is adapted to the electromagnetic coil 110 to move under the action of the energized electromagnetic coil 110 to a position that opens the valve plug 220 and closes the air inlet 101 (e.g., ...). Figure 7 and Figure 8 (As shown).

[0047] In some embodiments of this utility model, the valve plug 220 and the valve stem 210 can be fixed together by an interference fit. Of course, those skilled in the art can also fix the valve plug 220 and the valve stem 210 together by any feasible method such as threaded connection or welding, as needed.

[0048] like Figure 2and Figure 6 As shown, in some embodiments of this utility model, the valve plug 220 is provided with a non-circular hole 2201 extending along its axial direction o. The valve stem 210 is inserted into the non-circular hole 2201 and abuts against the peripheral wall of the non-circular hole 2201. The pressure equalization channel 201 is located in the non-circular hole 2201 and is defined by the valve plug 220 and the valve stem 210.

[0049] Continue reading Figure 2 and Figure 6 In some embodiments of this utility model, the non-circular hole 2201 includes a central hole portion 22011 adapted to the valve stem 210 and a wing hole portion 22012 located radially outward of the central hole portion 22011. A pressure equalization channel 201 is formed in the wing hole portion 22012.

[0050] In addition, in other embodiments of this utility model, those skilled in the art can also set the non-circular hole 2201 in any other feasible form as needed, such as a hole structure with a cross-section of plum blossom, triangle, rectangle, etc.

[0051] Alternatively, those skilled in the art may, as needed, configure the pressure equalization channel 201 as a through hole formed on the valve plug 220, with the through hole offset from the valve stem 210 by a certain distance; or configure the pressure equalization channel 201 as a channel formed on the valve stem 210. Furthermore, those skilled in the art may, as needed, configure the non-circular hole 2201 as circular.

[0052] like Figure 7 and Figure 8 As shown, in some embodiments of this utility model, the valve stem 210 passes through the fixed magnetic yoke 120 and is in clearance fit with the fixed magnetic yoke 120 so that gas can flow between the two sides of the axial direction of the fixed magnetic yoke 120.

[0053] Accordingly, the movable magnetic yoke 230 and the valve stem 210 can be fixed together by an interference fit. Of course, those skilled in the art can also fix the movable magnetic yoke 230 and the valve stem 210 together by any feasible method such as threaded connection or welding, as needed.

[0054] Furthermore, the movable magnetic yoke 230 and the valve sleeve 160 can be clearance-fitted to allow gas to flow between the two sides of the axial direction of the movable magnetic yoke 230.

[0055] Those skilled in the art will understand that the pressure equalization channel 201, the gap between the valve stem 210 and the fixed magnetic yoke 120, and the gap between the movable magnetic yoke 230 and the valve sleeve 160 allow the high-pressure gas to fill the entire interior of the valve body assembly 100 when the valve plug 220 closes the air inlet 101, minimizing the pressure difference experienced by the valve core assembly 200 in the axial direction. Simultaneously, when the valve plug 220 opens the air inlet 101, the high-pressure gas inside the valve body assembly 100 is released through the pressure equalization channel 201, the gap between the valve stem 210 and the fixed magnetic yoke 120, and the gap between the movable magnetic yoke 230 and the valve sleeve 160.

[0056] Furthermore, in other embodiments of this utility model, those skilled in the art may omit the valve stem 210 and / or the movable yoke 230 as needed. For example, both the valve stem 210 and the movable yoke 230 may be omitted, and the pneumatic shut-off valve 001 may be configured such that the valve plug 220 moves under the electromagnetic force of the electromagnetic coil 110.

[0057] Continue reading Figure 6 In some embodiments of this utility model, an end face sealing ring 221 is provided on the side of the valve plug 220 away from the fixed magnetic yoke 120. The end face sealing ring 221 is adapted to the conical ring 1311 in the valve seat 131. When the end face sealing ring 221 abuts against the conical ring 1311 in the valve seat 131, the end face sealing ring 221 and the valve plug 220 together seal the air inlet 101.

[0058] Continue reading Figure 6 In some embodiments of this utility model, a shock-absorbing member 222 is provided on the side of the valve plug 220 away from the fixed magnetic yoke 120 (the side away from the conical ring 1311). The shock-absorbing member 222 is used to abut against the fixed magnetic yoke 120 to reduce the impact of the valve core assembly 200 on the valve body assembly 100.

[0059] For example, the valve plug 220 is provided with an annular groove (not shown in the figure), and the shock-absorbing member 222 includes an annular portion (not marked in the figure) embedded in the annular groove and a plurality of protrusions (not marked in the figure) provided on the annular portion. The shock-absorbing member 222 is made of rubber, latex or any other feasible elastic material to absorb the impact of the valve core assembly 200 on the valve body assembly 100 when the valve core assembly 200 opens the air inlet 101.

[0060] like Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, in some embodiments of this utility model, the air flow cut-off valve 001 may further include a return spring 300 disposed between the valve body assembly 100 and the valve core assembly 200. The return spring 300 is used to drive the valve core assembly 200 to return to the position where the valve plug 220 opens or closes the air inlet 101.

[0061] like Figure 7 and Figure 8 As shown, the return spring 300 is sleeved on the outside of the valve stem 210, and its two ends in the axial direction O abut against the fixed magnetic yoke 120 and the movable magnetic yoke 230, respectively. For the structure of the fixed magnetic yoke 120 and the movable magnetic yoke 230 abutting against the return spring 300, please refer to [reference needed]. Figures 5 to 8 .

[0062] In some embodiments of this utility model, both the fixed magnetic yoke 120 and the movable magnetic yoke 230 can be made of materials with good magnetic permeability, such as iron, silicon steel, and stainless steel. This allows the magnetic field generated when the electromagnetic coil 110 is energized to act simultaneously on both the movable magnetic yoke 230 and the fixed magnetic yoke 120, thereby causing the movable magnetic yoke 230 to move toward the fixed magnetic yoke 120.

[0063] The following reference Figure 7 and Figure 8 The working principle of the pneumatic shut-off valve 001 in some embodiments of this utility model will be briefly explained.

[0064] like Figure 7 As shown, when the electromagnetic coil 110 is de-energized, under the action of the return spring 300, the movable yoke 230 and the fixed yoke 120 move away from each other, thereby causing the valve core assembly 200 to open the air inlet 101, making the air inlet 101 and the air outlet 102 connected. In this state, gas can flow from the air inlet 101 to the air outlet 102.

[0065] When the electromagnetic coil 110 is energized, the magnetic field generated by the electromagnetic coil 110 acts on the movable yoke 230 and the fixed yoke 120, causing the movable yoke 230 and the fixed yoke 120 to attract each other. This magnetic force overcomes the elastic force of the return spring 300, driving the valve core assembly 200 from... Figure 7 Move to the position shown Figure 8 The location shown.

[0066] like Figure 8 As shown, when the electromagnetic coil 110 is energized, the valve plug 220 abuts against the conical ring 1311 on the valve seat 131, sealing the air inlet 101. High-pressure gas in the upstream gas path connected to the air inlet 101 flows to the pressure equalization zone 1032 via the pressure equalization channel 201 (e.g., ...). Figure 8(As shown by the dashed lines), this ensures that the air pressure at both ends of the valve plug 220 in the air guiding zone 1031 and the pressure equalization zone 1032 is equal, thereby minimizing the pressure difference experienced by the valve plug 220. Simultaneously, the high-pressure gas in the pressure equalization zone 1032 will fill the entire valve body assembly 100 through the gap between the valve stem 210 and the fixed magnetic yoke 120, and through the movable magnetic yoke 230 and the valve sleeve 160, minimizing the pressure difference experienced by the entire valve core assembly 200 in the axial direction.

[0067] When the electromagnetic coil 110 is de-energized, the return spring 300 drives the valve core assembly 200 from... Figure 8 Move to the position shown Figure 7 The position shown. At the instant the valve plug 220 disengages from the conical ring 1311, the high-pressure air inside the valve body assembly 100 is quickly released through the pressure equalization channel 201, the gap between the valve stem 210 and the fixed magnetic yoke 120, and the gap between the movable magnetic yoke 230 and the valve sleeve 160, ensuring that the movement of the valve core assembly 200 is not affected by the air pressure difference.

[0068] Based on the foregoing description, those skilled in the art will understand that this invention, by arranging the valve plug 220 of the valve core assembly 200 within the airflow cut-off control chamber 103 of the valve body assembly 100, divides the airflow cut-off control chamber 103 into an air guiding zone 1031 and a pressure equalization zone 1032. By connecting the air guiding zone 1031 to both the air inlet 101 and the air outlet 102, the airflow entering through the air inlet 101 can flow to the air outlet 102 via the air guiding zone 1031. By defining a pressure equalization channel 201 connecting the air guiding zone 1031 and the pressure equalization zone 1032 within the valve core assembly 200, when the valve plug 220 closes the air inlet 101, the high-pressure gas at the air inlet 101 can be introduced into the pressure equalization zone 1032 through this pressure equalization channel 201, thereby reducing the pressure difference across the valve plug 220 along its axial direction, and thus reducing the pressure difference experienced by the valve core assembly 200.

[0069] The technical solution of this utility model has been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is not limited to these specific embodiments. Without departing from the technical principles of this utility model, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this utility model will fall within the protection scope of this utility model.

[0070] Finally, it should be noted that in this invention, the term "connection" refers to fluid communication, allowing fluid (e.g., air, liquid) to flow between two interconnected entities. Furthermore, this "connection" can be either a leak-free flow of fluid between two interconnected entities, or a flow with slight leakage between two interconnected entities.

Claims

1. A pneumatic shut-off valve, characterized in that, include: The valve body assembly is provided with an air inlet for connecting to an upstream air path, an air outlet for connecting to a downstream air path, and an air flow cut-off control chamber that connects the air inlet and the air outlet. The valve core assembly includes a valve plug movably mounted axially within the airflow cutoff control chamber. The valve plug is used to close and open the air inlet and divide the airflow cutoff control chamber into a guiding zone and a pressure equalization zone, the guiding zone being connected to the air inlet and the air outlet, respectively. The valve core assembly defines a pressure equalization channel connecting the guiding zone and the pressure equalization zone, so as to introduce high-pressure gas at the air inlet into the pressure equalization zone when the valve plug closes the air inlet, thereby reducing the pressure difference across the axial ends of the valve plug.

2. The pneumatic shut-off valve according to claim 1, characterized in that, The valve body assembly includes an electromagnetic coil; The valve core assembly also includes a valve stem that is fixedly connected to or integrally formed with the valve plug, and a movable magnetic yoke that is fixedly connected to or integrally formed with the valve stem. The movable yoke is attracted by the electromagnetic force generated by the electromagnetic coil, forcing the valve core assembly to move to a position that moves the valve plug to close or open the air inlet.

3. The pneumatic shut-off valve according to claim 2, characterized in that, The valve plug is provided with a non-circular hole extending along its axial direction. The valve stem is inserted into the non-circular hole and abuts against the peripheral wall of the non-circular hole; The pressure equalization channel is located within the non-circular hole and is defined by the valve plug and the valve stem.

4. The pneumatic shut-off valve according to claim 3, characterized in that, The non-circular hole includes a central hole portion adapted to the valve stem and a wing hole portion located radially outward of the central hole portion; The pressure equalization channel is formed within the wing-shaped opening.

5. The pneumatic shut-off valve according to claim 2, characterized in that, The valve body assembly also includes a fixed magnetic yoke; The air flow cut-off valve is configured such that the magnetic field generated when the electromagnetic coil is energized acts simultaneously on the movable yoke and the fixed yoke, causing the movable yoke to move toward the fixed yoke.

6. The pneumatic shut-off valve according to claim 5, characterized in that, The valve stem passes through the fixed magnetic yoke and is in clearance fit with the fixed magnetic yoke so that gas can flow between the two axial sides of the fixed magnetic yoke.

7. The pneumatic shut-off valve according to claim 5, characterized in that, The valve body assembly also includes a valve seat, which, together with the fixed magnetic yoke, defines the airflow cut-off control chamber. The air inlet is formed at the axial end of the valve seat away from the fixed magnetic yoke; The air outlet is formed on the circumferential sidewall of the valve seat; The valve seat is provided with a conical ring at the air inlet, and the conical ring can seal against the valve plug and thus close the air inlet.

8. The pneumatic shut-off valve according to claim 7, characterized in that, The valve plug is provided with an end face sealing ring on the side near the conical ring so that the valve plug can seal against the conical ring through the end face sealing ring.

9. The pneumatic shut-off valve according to claim 8, characterized in that, A shock-absorbing component is provided on the side of the valve plug away from the conical ring, so that when the valve plug opens the air inlet, it abuts against the fixed magnetic yoke through the shock-absorbing component, thereby weakening the impact force of the valve plug on the fixed magnetic yoke.

10. The pneumatic shut-off valve according to any one of claims 2 to 9, characterized in that, The air flow cut-off valve also includes a return spring disposed between the valve body assembly and the valve core assembly, the return spring being used to drive the valve core assembly to return to a position that opens or closes the air inlet.

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