Air flow on-off valve

Abstract

The utility model belongs to the technical field of valves, and particularly provides an airflow on-off valve. The air flow on-off valve aims at solving the problem that when an existing air flow on-off valve acts, noise is large. Therefore, the airflow on-off valve comprises a valve body assembly, a valve element assembly and a damping device. An air inlet used for being connected with an upstream air path, an air outlet used for being connected with a downstream air path and an air flow channel enabling the air inlet and the air outlet to be communicated are defined in the valve body assembly. The valve body assembly further comprises an electromagnet. The valve element assembly is arranged in the valve body assembly and comprises a valve rod driven by the electromagnet so that the valve element assembly can control opening and closing of the airflow channel through axial movement of the valve rod. The damping device comprises an elastic component arranged between the valve body assembly and the valve rod in the radial direction of the valve rod so as to provide friction damping force for axial movement of the valve element assembly. The resilient member also defines a gap that allows airflow to flow between axially opposite sides thereof. 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, solenoid 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, solenoid valves play a key role in adjusting suspension damping, optimizing ride comfort, and enhancing handling performance. Solenoid valves typically regulate 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 electromagnetically driven pneumatic shut-off valves generally include a valve body assembly and a valve core assembly. The valve body assembly defines an air inlet, an air outlet, and an airflow passage connecting the inlet and outlet. The valve core assembly operates under electromagnetic force, thereby controlling the opening and closing of the airflow passage. When the valve core assembly moves to a position that opens or closes the airflow passage, it inevitably generates a significant impact force on the valve body assembly, causing considerable noise and affecting the ride comfort of passengers. Utility Model Content

[0004] One objective of this invention is to solve the problem of excessive noise during the operation of existing airflow shut-off valves.

[0005] A further objective of this invention is to ensure the response frequency of the pneumatic shut-off valve while reducing the operating noise of the pneumatic shut-off valve.

[0006] To achieve the above objectives, this utility model provides a pneumatic shut-off valve, comprising:

[0007] The valve body assembly defines an air inlet for connecting to an upstream air path, an air outlet for connecting to a downstream air path, and an airflow passage connecting the air inlet and the air outlet; the valve body assembly also includes an electromagnet.

[0008] A valve core assembly is disposed within the valve body assembly and includes a valve stem driven by the electromagnet, so that the valve core assembly controls the opening and closing of the airflow passage by means of the axial movement of the valve stem;

[0009] A damping device includes an elastic member disposed radially between the valve body assembly and the valve stem along the valve stem, the elastic member being interference-fitted with at least one of the valve body assembly and the valve stem in the radial direction to provide frictional damping force for axial movement of the valve core assembly; the elastic member further defines a gap allowing airflow to flow between its axially opposite sides.

[0010] Optionally, the elastic member is a drum spring, which is mounted on one of the valve body assembly and the valve core assembly, and the drum spring presses against the other of the valve body assembly and the valve core assembly in its radial direction.

[0011] Optionally, the drum-shaped spring is configured as a concave spring, which is fixedly connected to the valve body assembly in its axial direction and slides in contact with the valve core assembly.

[0012] Optionally, the radial cross-section of the drum spring is C-shaped, and the drum spring is provided with a plurality of strip holes extending along its axial direction, the gap being at least a portion of the strip holes.

[0013] Optionally, the damping device further includes a mounting base, which is fixedly installed inside the valve body assembly, and the drum spring is installed inside the mounting base.

[0014] Optionally, the mounting base is configured as annular, and the mounting base is provided with an inner flange for stopping the drum-shaped spring; the valve body assembly includes a stop surface for stopping one end of the drum-shaped spring away from the inner flange, and the distance between the stop surface and the inner flange is greater than the natural length of the drum-shaped spring, so that the drum-shaped spring can deform in its axial direction to adapt to the deformation of the valve core assembly.

[0015] Optionally, the valve core assembly includes a valve plug fixed to the valve stem and a movable magnetic yoke. The valve plug is used to control the opening and closing of the airflow passage, and the movable magnetic yoke is adapted to the electromagnet to move to a position that opens or closes the airflow passage under the action of the energized electromagnet.

[0016] Optionally, the valve stem is provided with an annular shoulder, which slides in contact with the elastic member; and / or, the valve stem is provided with an annular arcuate groove, and the damping device is embedded in the arcuate groove, so that the friction force on the valve core assembly first decreases and then increases during the movement, thereby improving the response frequency of the valve core assembly.

[0017] Optionally, the valve core assembly further includes a fixed magnetic yoke for fixing the damping device; the pneumatic shut-off valve is configured such that the magnetic field generated when the electromagnet is energized acts on both the movable magnetic yoke and the fixed magnetic yoke simultaneously, so that the movable magnetic yoke moves toward the fixed magnetic yoke.

[0018] Optionally, the airflow shut-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 blocks or connects the airflow passage.

[0019] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this utility model, by providing a damping device between the valve body assembly and the valve core assembly, the damping device can provide frictional damping force to the movement of the valve core assembly, thereby reducing the impact force of the valve core assembly on the valve body assembly and thus reducing the noise during the operation of the pneumatic shut-off valve. Specifically, by providing the elastic member of the damping device radially between the valve body assembly and the valve stem, and by ensuring that the elastic member is radially interference-fitted with at least one of the valve body assembly and the valve stem, frictional damping force is provided to the axial movement of the valve core assembly, thereby reducing the impact force of the valve core assembly on the valve body assembly and thus reducing the noise during the operation of the pneumatic shut-off valve.

[0020] Furthermore, by setting the elastic component of the damping device as a drum-shaped spring, setting the drum-shaped spring as a concave spring, and fixing the drum-shaped spring to the valve body assembly in its axial direction and making it slide in contact with the valve core assembly, the response speed of the valve core assembly is avoided due to excessive mass, compared to fixing the drum-shaped spring to the valve core assembly.

[0021] Furthermore, by first installing the drum spring into the mounting base and then installing the mounting base into the valve body assembly, the installation of the drum spring is facilitated.

[0022] Furthermore, by providing an inner flange on the mounting base to stop the drum spring, and providing a stop surface on the valve body assembly to abut the end of the drum spring away from the inner flange, and making the distance between the stop surface and the inner flange greater than the natural length of the drum spring, the drum spring can adapt to the deformation of the valve core assembly in the axial direction, ensuring that the drum spring can press the valve core assembly radially.

[0023] 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

[0024] 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:

[0025] Figure 1 This is an exploded view (first axonometric view) of the gas flow shut-off valve in some embodiments of this utility model;

[0026] Figure 2 This is an exploded view (second axonometric view) of the pneumatic shut-off valve in some embodiments of this utility model;

[0027] Figure 3 This is a perspective view (first axonometric view) of the pneumatic shut-off valve in some embodiments of this utility model;

[0028] Figure 4 This is a perspective view (second axonometric view) of the pneumatic shut-off valve in some embodiments of this utility model;

[0029] Figure 5 yes Figure 4 Cross-sectional view of the middle valve body assembly along the AA direction;

[0030] Figure 6 yes Figure 4 A cross-sectional view of the fixed magnetic yoke along the AA direction;

[0031] Figure 7 yes Figure 4 Cross-sectional view of the central valve core assembly along the AA direction;

[0032] Figure 8 yes Figure 1 and Figure 2 Radial side view of the valve stem;

[0033] Figure 9 This is a radial side view of the valve stem in some other embodiments of this utility model;

[0034] Figure 10 yes Figure 1 and Figure 2 Exploded view of the intermediate damping device;

[0035] Figure 11 yes Figure 1 and Figure 2 A three-dimensional view of the intermediate damping device;

[0036] Figure 12 yes Figure 11 Cross-sectional view of the intermediate damping device along the BB direction;

[0037] Figure 13 yes Figure 4 A cross-sectional view of the gas shut-off valve along the AA direction (open state);

[0038] Figure 14 yes Figure 4 A cross-sectional view of the gas flow shut-off valve along the AA direction (closed state).

[0039] Explanation of reference numerals in the attached figures:

[0040] 001. Pneumatic shut-off valve;

[0041] 100. Valve body assembly; 101. Air inlet; 102. Air outlet; 103. Airflow passage; 110. Electromagnet; 120. Fixed yoke; 121. Stop surface; 131. Valve seat; 1311. Conical ring; 132. Valve cover; 140. Housing; 150. Power plug; 160. Valve sleeve; 170. Dynamic sealing assembly; 180. Mounting sealing ring;

[0042] 200. Valve core assembly; 210. Valve stem; 211. Annular shoulder; 212. Arc groove; 220. Valve plug; 221. End face sealing ring; 222. Vibration damping component; 230. Movable magnetic yoke;

[0043] 300 Damping device; 310 Elastic component; 3101 Clearance; 311 Drum spring; 3111 Strip hole; 320 Mounting base; 321 Inner flange;

[0044] 400. Return spring;

[0045] r, radial; o, axial. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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, a valve core assembly 200, and a damping device 300.

[0050] like Figures 1 to 5 As shown, the valve body assembly 100 defines an air inlet 101 for connecting to an upstream air path, an air outlet 102 for connecting to a downstream air path, and an airflow passage 103 connecting the air inlet 101 and the air outlet 102. The valve body assembly 100 also includes an electromagnet 110 for driving the valve core assembly 200.

[0051] like Figures 1 to 14 As shown, the valve core assembly 200 is disposed within the valve body assembly 100 and includes a valve stem 210 driven by an electromagnet 110, so that the valve core assembly 200 controls the opening and closing of the airflow passage 103 by means of the axial movement of the valve stem 210.

[0052] like Figures 1 to 14 As shown, the damping device 300 includes an elastic member 310 disposed radially r between the valve body assembly 100 and the valve stem 210 along the valve stem 210. The elastic member 310 is interference-fitted with at least one of the valve body assembly 100 and the valve stem 210 in the radial direction r to provide frictional damping force for axial o-movement of the valve core assembly 200. The elastic member 310 also defines a gap 3101 that allows airflow to flow between opposite sides of its axial o-movement (e.g., ...). Figure 12 (The part within the dashed box).

[0053] Those skilled in the art will understand that by providing a damping device 300 between the valve body assembly 100 and the valve core assembly 200, the damping device 300 can provide frictional damping force to the movement of the valve core assembly 200, thereby reducing the impact force of the valve core assembly 200 on the valve body assembly 100 and reducing the noise during the operation of the pneumatic shut-off valve 001. Specifically, by providing the elastic member 310 of the damping device 300 along the radial direction r of the valve stem 210 between the valve body assembly 100 and the valve stem 210, and by ensuring that the elastic member 310 is interference-fitted with at least one of the valve body assembly 100 and the valve stem 210 in the radial direction r, frictional damping force is provided to the axial movement o of the valve core assembly 200, thereby reducing the impact force of the valve core assembly 200 on the valve body assembly 100 and reducing the noise during the operation of the pneumatic shut-off valve 001.

[0054] The following reference Figures 5 to 14 The following is a further explanation of the pneumatic shut-off valve 001 of this utility model.

[0055] like Figure 5 As shown, in some embodiments of this utility model, the valve body assembly 100 further includes 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.

[0056] The fixed magnetic yoke 120 is used to confine the magnetic field generated by the electromagnet 110, thereby improving the efficiency of the magnetic field. The valve seat 131 and valve cover 132 are located at opposite ends of the housing 140 along the axial direction (o), and are fixedly connected to the housing 140 to encapsulate and protect components such as the electromagnet 110, fixed magnetic yoke 120, valve sleeve 160, and dynamic sealing assembly 170. The power plug 150 is installed on the valve cover 132 and electrically connected to the electromagnet 110 to provide power. The valve sleeve 160 accommodates a portion of the valve core assembly 200 and provides guidance for the axial movement of the valve core assembly 200. 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 the axial direction (o) of the dynamic sealing assembly 170. A sealing ring 180 is installed to seal the valve body assembly 100 against the mounting object (e.g., a metal block or pipe with a insertion hole) to prevent high-pressure gas leakage.

[0057] 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. An electromagnet 110 is disposed inside the housing 140, a fixed yoke 120 is disposed between the valve seat 131 and the electromagnet 110, a power plug 150 is installed at the valve cover 132, and a valve sleeve 160 is disposed inside the electromagnet 110. A dynamic sealing assembly 170 is disposed along its axial direction o between the valve seat 131 and the fixed yoke 120 and is clamped by the valve seat 131 and the fixed yoke 120. Sealing rings 180 are respectively provided on the outer sides of the valve seat 131 and the housing 140.

[0058] from Figure 5 As can be seen from the figure, in some embodiments of this utility model, the air inlet 101, air outlet 102, and airflow passage 103 of the valve body assembly 100 are all formed on the valve seat 131. Specifically, the air inlet 101 is formed at one end of the valve seat 131 along the axial direction (o), and the air outlet 102 is formed on the peripheral wall 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. A conical ring 1311 is provided on the side of this annular structure near the fixed magnetic yoke 120. This conical ring 1311 abuts against the valve core assembly 200, thereby blocking the airflow passage 103.

[0059] 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.

[0060] like Figure 6 As shown, in some embodiments of the present invention, the valve body assembly 100 further includes a stop surface 121 disposed on the fixed magnetic yoke 120. The stop surface 121 is used to stop the elastic member 310 so that the elastic member 310 is adapted to the valve core assembly 200.

[0061] like Figure 1 , Figure 2 and Figure 7 As shown, in some embodiments of this utility model, the valve core assembly 200 further includes a valve plug 220 and a movable magnetic yoke 230 fixed to the valve stem 210.

[0062] The valve plug 220 is used to control the opening and closing of the airflow passage 103. The movable yoke 230 is adapted to the electromagnet 110 so that it can move to a position that opens or closes the airflow passage 103 under the action of the energized electromagnet 110 (e.g., ...). Figure 13 and Figure 14 (As shown).

[0063] like Figure 7 As shown, 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.

[0064] 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.

[0065] Continue reading Figure 7 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 block the connection of the airflow channel 103.

[0066] Continue reading Figure 7 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 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.

[0067] 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, so as to absorb the impact of the valve core assembly 200 on the valve body assembly 100 when the valve core assembly 200 opens the airflow passage 103.

[0068] like Figure 7 and Figure 8 As shown, in some embodiments of this utility model, the valve stem 210 is provided with an annular shoulder 211, which slides in contact with the elastic element 310, so that the valve stem 210 is only in interference fit with the elastic element 310 through its annular shoulder 211. This ensures that the damping device 300 can provide frictional damping for the valve stem 210, while also making it convenient for the assembly personnel to insert the valve stem 210 into the damping device 300.

[0069] like Figure 9As shown, in some other embodiments of this utility model, an annular arc groove 212 may be provided on the valve stem 210, and the damping device 300 is embedded in the arc groove 212 so that the friction force on the valve core assembly 200 during the movement first decreases and then increases, thereby improving the response frequency of the valve core assembly 200.

[0070] like Figures 10 to 12 As shown, in some embodiments of this invention, the elastic member 310 is a drum spring 311. The drum spring 311 is mounted on one of the valve body assembly 100 and the valve core assembly 200, and the drum spring 311 presses against the other of the valve body assembly 100 and the valve core assembly 200 in its radial direction r.

[0071] Furthermore, such as Figures 11 to 14 As shown, the damping device 300 also includes a mounting base 320. This mounting base 320 is securely mounted within the valve body assembly 100 (e.g., ...). Figure 13 and Figure 14 As shown), the drum spring 311 is installed into the mounting base 320 (as shown). Figures 11 to 14 (As shown).

[0072] The mounting base 320 can be fixedly connected to the fixed magnetic yoke 120 by interference fit or threaded connection. The drum spring 311 can be made of materials such as metal, plastic, or nylon.

[0073] like Figures 10 to 12 As shown, the drum spring 311 is configured as a concave spring, and the drum spring 311 is fixedly connected to the valve body assembly 100 in its axial direction o and slides in contact with the valve core assembly 200.

[0074] Furthermore, the radial cross-section of the drum spring 311 is C-shaped, and the drum spring 311 is provided with a plurality of strip-shaped holes 3111 extending along its axial direction o, and the gap 3101 is at least a portion of the strip-shaped holes 3111 (e.g. Figure 12 (The part within the dashed box).

[0075] Those skilled in the art will understand that this type of drum spring 311 can produce radial and axial deformation when it is pressed outward by the valve stem 210, and the deformation response speed is faster.

[0076] Of course, those skilled in the art can also, as needed, make the radial r section of the drum spring 311 annular, so that the drum spring 311 only produces radial r deformation when it is squeezed outward by the valve stem 210.

[0077] like Figure 12As shown, the mounting base 320 is annular and has an inner flange 321 for stopping the drum spring 311 to prevent the drum spring 311 from coming out of the mounting base 320 during use.

[0078] like Figure 13 and Figure 14 As shown, in the assembled state, the end of the mounting base 320 away from the inner flange 321 abuts against the stop surface 121 on the fixed magnetic yoke 120, so as to stop the end of the drum spring 311 away from the inner flange 321 through the stop surface 121.

[0079] like Figures 12 to 14 As shown, in the assembled state, the distance D between the stop surface 121 and the inner flange 321 is greater than the natural length L of the drum spring 311, so that the drum spring 311 can deform in its axial direction o to adapt to the deformation of the valve core assembly 200.

[0080] Those skilled in the art will understand that, in the aforementioned engagement of the drum spring 311, particularly when there is a gap between the drum spring 311 and the valve seat 131, the drum spring 311 can move a small distance with the valve stem 210 until it abuts against the inner flange 321 or the stop surface 121. This small distance of movement of the drum spring 311 enables the valve core assembly 200 to respond rapidly at the start of its movement, thereby increasing the response frequency of the pneumatic shut-off valve 001.

[0081] Furthermore, in other embodiments of this utility model, those skilled in the art can, as needed, configure the damping device 300 in any other feasible form and / or place it in any other feasible location. Examples are given below.

[0082] Example 1: The mounting base 320 is omitted, and the drum spring 311 is directly mounted onto the fixed magnetic yoke 120. For example, an annular groove can be made on the inner side of the fixed magnetic yoke 120. After the drum spring 311 is installed into the fixed magnetic yoke 120, a retaining ring is installed in the annular groove to fix the drum spring 311 into the fixed magnetic yoke 120.

[0083] Example 2: The damping device 300 is disposed between the valve sleeve 160 and the movable magnetic yoke 230. For example, the mounting base 320 is interference-fitted with the valve sleeve 160, and the drum spring 311 is in sliding contact with the movable magnetic yoke 230.

[0084] Example 3: The mounting base 320 is omitted, and the drum spring 311 is set as a central convex spring and locked onto the valve stem 210. For example, an annular groove is provided on the valve stem 210, and the drum spring 311 is embedded in the annular groove.

[0085] like Figure 1 , Figure 2 , Figure 13 and Figure 14 As shown, in some embodiments of the present invention, the air flow cut-off valve 001 may further include a return spring 400 disposed between the valve body assembly 100 and the valve core assembly 200. The return spring 400 is used to drive the valve core assembly 200 to return to the position where the valve plug 220 blocks or connects the air flow channel 103.

[0086] like Figure 13 and Figure 14 As shown, the return spring 400 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 400, please refer to [reference needed]. Figures 5 to 7 , Figure 13 and Figure 14 .

[0087] 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 electromagnet 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.

[0088] The following reference Figure 13 and Figure 14 The working principle of the pneumatic shut-off valve 001 in some embodiments of this utility model will be briefly explained.

[0089] like Figure 13 As shown, when the electromagnet 110 is de-energized, under the action of the return spring 400, 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.

[0090] When electromagnet 110 is energized, the magnetic field generated by electromagnet 110 acts on movable yoke 230 and fixed yoke 120, causing movable yoke 230 and fixed yoke 120 to attract each other. This magnetic force overcomes the elastic force of return spring 400, driving valve core assembly 200 from... Figure 13 Move to the position shown Figure 14 The position shown. During this process, frictional damping is generated between the moving valve stem 210 and the drum spring 311 to reduce the moving speed of the valve core assembly 200 and weaken the impact force of the valve core assembly 200 on the valve seat 131.

[0091] like Figure 14As shown, when the electromagnet 110 is energized, the valve plug 220 abuts against the conical ring 1311 on the valve seat 131, blocking the airflow passage 103.

[0092] When the electromagnet 110 is de-energized, the return spring 400 drives the valve core assembly 200 from... Figure 14 Move to the position shown Figure 13 The position shown. During this process, frictional damping is generated between the moving valve stem 210 and the drum spring 311 to reduce the moving speed of the valve core assembly 200 and weaken the impact force of the valve core assembly 200 on the fixed magnetic yoke 120.

[0093] Furthermore, in some embodiments of this utility model, the valve sleeve 160 and the movable magnetic yoke 230 can be fitted with a clearance to allow gas to flow back and forth between the cavities on the upper and lower sides of the movable magnetic yoke 230, thereby avoiding the generation of a large pressure difference that would affect the movement of the valve core assembly 200.

[0094] Based on the foregoing description, those skilled in the art will understand that the present invention reduces the impact force of the valve core assembly 200 on the valve body assembly 100 by providing a damping device 300 between the valve body assembly 100 and the valve core assembly 200, thereby reducing the noise when the pneumatic shut-off valve 001 operates.

[0095] 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.

[0096] 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 defines an air inlet for connecting to an upstream air path, an air outlet for connecting to a downstream air path, and an airflow passage connecting the air inlet and the air outlet; the valve body assembly also includes an electromagnet. A valve core assembly is disposed within the valve body assembly and includes a valve stem driven by the electromagnet, so that the valve core assembly controls the opening and closing of the airflow passage by means of the axial movement of the valve stem; A damping device includes an elastic member disposed radially between the valve body assembly and the valve stem along the valve stem, the elastic member being interference-fitted with at least one of the valve body assembly and the valve stem in the radial direction to provide frictional damping force for axial movement of the valve core assembly; the elastic member further defines a gap allowing airflow to flow between its axially opposite sides.

2. The pneumatic shut-off valve according to claim 1, characterized in that, The elastic component is a drum-shaped spring. The drum-shaped spring is mounted on one of the valve body assembly and the valve core assembly, and the drum-shaped spring presses against the other of the valve body assembly and the valve core assembly in its radial direction.

3. The pneumatic shut-off valve according to claim 2, characterized in that, The drum-shaped spring is configured as a concave spring. The drum-shaped spring is fixedly connected to the valve body assembly in its axial direction and slides in contact with the valve core assembly.

4. The pneumatic shut-off valve according to claim 3, characterized in that, The drum-shaped spring has a C-shaped radial cross-section and is provided with a plurality of strip-shaped holes extending along its axial direction, the gap being at least a portion of the strip-shaped holes.

5. The pneumatic shut-off valve according to claim 3, characterized in that, The damping device also includes a mounting base. The mounting base is fixedly installed inside the valve body assembly, and the drum-shaped spring is installed inside the mounting base.

6. The pneumatic shut-off valve according to claim 5, characterized in that, The mounting base is configured as an annular shape, and the mounting base is provided with an inner flange for stopping the drum-shaped spring; The valve body assembly includes a stop surface for stopping one end of the drum spring away from the inner flange, and the distance between the stop surface and the inner flange is greater than the natural length of the drum spring, so that the drum spring can deform in its axial direction to adapt to the deformation of the valve core assembly.

7. The pneumatic shut-off valve according to any one of claims 1 to 6, characterized in that, The valve core assembly includes a valve plug fixed to the valve stem and a movable magnetic yoke. The valve plug is used to control the opening and closing of the airflow channel. The movable yoke is adapted to the electromagnet to move to a position that opens or closes the airflow passage under the action of the energized electromagnet.

8. The pneumatic shut-off valve according to claim 7, characterized in that, The valve stem is provided with an annular shoulder, which slides in contact with the elastic member; and / or The valve stem is provided with an annular arc groove, and the damping device is embedded in the arc groove so that the friction force on the valve core assembly first decreases and then increases during the movement, thereby improving the response frequency of the valve core assembly.

9. The pneumatic shut-off valve according to claim 7, characterized in that, The valve core assembly also includes a fixing magnetic yoke for fixing the damping device; The air flow cut-off valve is configured such that the magnetic field generated when the electromagnet is energized acts simultaneously on the movable yoke and the fixed yoke, causing the movable yoke to move toward the fixed yoke.

10. The pneumatic shut-off valve according to claim 7, characterized in that, The airflow shut-off valve also includes a return spring disposed between the valve body assembly and the valve core assembly. The return spring is used to drive the valve core assembly to return to a position that blocks or connects the airflow passage.

Images