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 a damping ring arranged between the valve body assembly and the valve rod in the radial direction of the valve rod so as to block axial movement of the valve rod. The damping ring is provided with an air guide channel communicated with the two axial sides of the damping ring. The utility model solves the technical problems.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of gas circuit control valve, specifically provides a kind of airflow on-off valve. BACKGROUND

[0002] In the field of automobiles, solenoid valves, as an important component of control systems, are widely used in various vehicle subsystems, including but not limited to suspension systems, braking systems, etc. In particular, in the automobile suspension system, solenoid valves play a key role in adjusting suspension damping, optimizing ride stability and handling performance. Solenoid valves usually adjust the stiffness and damping characteristics of the suspension system by controlling the on-off of airflow to adapt to different road conditions and driving needs.

[0003] The existing airflow on-off valve driven by electromagnet generally includes 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 air inlet and the air outlet. The valve core assembly is actuated under the action of electromagnetic force and thus controls the on-off of the airflow passage. When the valve core assembly moves to a position that connects or blocks the airflow passage, it inevitably generates a large impact force on the valve body assembly, causing a large noise and affecting the comfort of passengers. SUMMARY

[0004] One purpose of the utility model is to solve the problem of large noise when the existing airflow on-off valve operates.

[0005] Another purpose of the utility model is to avoid a large pressure difference inside the airflow on-off valve.

[0006] To achieve the above purpose, the utility model provides an airflow on-off valve, comprising:

[0007] a valve body assembly defining an air inlet for connecting an upstream air circuit, an air outlet for connecting a downstream air circuit and an airflow passage connecting the air inlet and the air outlet; the valve body assembly further comprises an electromagnet;

[0008] a valve core assembly arranged in the valve body assembly and comprising a valve rod driven by the electromagnet, so that the valve core assembly controls the on-off of the airflow passage by axial movement of the valve rod;

[0009] a damping device comprising a damping ring arranged radially along the valve rod between the valve body assembly and the valve rod to hinder the axial movement of the valve rod; the damping ring is provided with a gas guide passage communicating with both sides of the damping ring in the axial direction.

[0010] Optionally, the damping ring is fixedly installed in the valve body assembly, and the damping ring is in sliding contact with the valve rod.

[0011] Optionally, the damping device further comprises a mounting seat fixedly mounted in the valve body assembly, and the damping ring is mounted in the mounting seat.

[0012] Optionally, the mounting seat is annular, and the mounting seat is provided with an inner flange for stopping the damping ring; the valve body assembly comprises a stopping surface for stopping one end of the damping ring away from the inner flange to prevent the damping ring from moving axially.

[0013] Optionally, the mounting seat is threadedly connected or interference-fitted with the valve body assembly; and / or the damping ring is interference-fitted or integrally formed with the mounting seat.

[0014] Optionally, the inner side of the damping ring is provided with a plurality of abutting rings and a plurality of annular grooves, and the plurality of abutting rings and the plurality of annular grooves are alternately distributed along the axial direction of the damping ring, so that the abutting rings can be deformed along the axial direction when subjected to radial extrusion force.

[0015] Optionally, the gas guide channel is arranged on the inner side of the damping ring and penetrates through the plurality of abutting rings; and / or the damping ring is an annular member made of rubber or elastic plastic.

[0016] Optionally, the valve core assembly comprises a valve plug fixed to the valve rod and a movable magnetic yoke, the valve plug is used to control the opening and closing of the gas flow channel; the movable magnetic yoke is adapted to the electromagnet to move to a position where the valve plug communicates or blocks the gas flow channel under the action of the energized electromagnet.

[0017] Optionally, the valve rod is provided with an annular shoulder in sliding contact with the damping ring; and / or the valve core assembly further comprises a fixed magnetic yoke for fixing the damping device; the gas flow interrupter valve is configured such that the magnetic field generated when the electromagnet is energized simultaneously acts on the movable magnetic yoke and the fixed magnetic yoke, so that the movable magnetic yoke moves towards the fixed magnetic yoke.

[0018] Optionally, the gas flow interrupter valve further comprises a return spring arranged between the valve body assembly and the valve core assembly, and the return spring is used to drive the valve core assembly to return to a position where the valve plug blocks or communicates the gas flow channel.

[0019] Based on the foregoing description, those skilled in the art can understand that in the technical solutions of the foregoing valve body assembly and valve rod, the damping ring is arranged between the valve body assembly and the valve rod to hinder the axial movement of the valve rod, effectively weakening the impact force of the valve core assembly on the valve body assembly, thereby reducing the noise when the gas flow interrupter valve acts.

[0020] And, by setting the air guide channel which communicates with the axial two sides of the damping ring, the airflow can flow into and out of the inside of the airflow on-off valve via the damping ring, avoiding the generation of a large air pressure difference in the inside of the airflow on-off valve.

[0021] Further, by setting multiple abutting rings and multiple annular grooves on the inside of the damping ring and making the multiple abutting rings and multiple annular grooves alternately distributed along the axial direction of the damping ring, the abutting rings can be deformed along the axial direction when subjected to radial extrusion force. The damping ring with such a structure can press the valve stem in the radial direction and provide sufficient damping force for the movement of the valve core assembly.

[0022] Other beneficial effects of the present utility model will be described in detail in the following with reference to the drawings, so that the persons skilled in the art can more clearly understand the improvement purposes, features and advantages of the present utility model. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the present utility model, the following will describe some embodiments of the present utility model with reference to the drawings. The person skilled in the art should understand that the components or parts indicated by the same reference signs in different drawings are the same or similar; the drawings of the present utility model are not necessarily drawn to scale with each other. In the drawings:

[0024] Figure 1 is a structural exploded view (first axonometric perspective) of the airflow on-off valve in some embodiments of the present utility model;

[0025] Figure 2 is a structural exploded view (second axonometric perspective) of the airflow on-off valve in some embodiments of the present utility model;

[0026] Figure 3 is a perspective view (first axonometric perspective) of the airflow on-off valve in some embodiments of the present utility model;

[0027] Figure 4 is a perspective view (second axonometric perspective) of the airflow on-off valve in some embodiments of the present utility model;

[0028] Figure 5 is Figure 4 a sectional view of the valve body assembly along the A-A direction in the

[0029] Figure 6 is Figure 4 a sectional view of the fixed magnetic yoke along the A-A direction in the

[0030] Figure 7 is Figure 4 a sectional view of the valve core assembly along the A-A direction in the

[0031] Figure 8 is Figure 1 andFigure 2 Radial side view of the valve stem;

[0032] Figure 9 yes Figure 1 and Figure 2 Exploded view of the intermediate damping device;

[0033] Figure 10 yes Figure 1 and Figure 2 A three-dimensional view of the intermediate damping device;

[0034] Figure 11 yes Figure 10 Cross-sectional view of the intermediate damping device along the BB direction;

[0035] Figure 12 yes Figure 4 A cross-sectional view of the gas shut-off valve along the AA direction (open state);

[0036] Figure 13 yes Figure 4 A cross-sectional view of the gas flow shut-off valve along the AA direction (closed state).

[0037] Explanation of reference numerals in the attached figures:

[0038] 001. Pneumatic shut-off valve;

[0039] 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;

[0040] 200. Valve core assembly; 210. Valve stem; 211. Annular shoulder; 220. Valve plug; 221. End face seal ring; 222. Vibration damping component; 230. Movable magnetic yoke;

[0041] 300 Damping device; 310 Damping ring; 311 Air guide channel; 312 Abutment ring; 313 Annular groove; 320 Mounting base; 321 Inner flange;

[0042] 400. Return spring;

[0043] r, radial; o, axial. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] like Figures 1 to 13As 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.

[0050] like Figures 1 to 13 As shown, the damping device 300 includes a damping ring 310 disposed radially r between the valve body assembly 100 and the valve stem 210 to impede axial movement o of the valve stem 210. The damping ring 310 has an air guide channel 311 connecting both sides of its axial movement o.

[0051] Those skilled in the art will understand that by providing a damping ring 310 between the valve body assembly 100 and the valve stem 210, the axial movement of the valve stem 210 is impeded, effectively reducing the impact force of the valve core assembly 200 on the valve body assembly 100, thereby reducing the noise during the operation of the pneumatic shut-off valve 001. Furthermore, by providing an air guide channel 311 on the damping ring 310 connecting its two axial sides, airflow can flow into and out of the interior of the pneumatic shut-off valve 001 through the damping ring 310, avoiding a large pressure difference inside the pneumatic shut-off valve 001.

[0052] The following reference Figures 5 to 13 The following is a further explanation of the pneumatic shut-off valve 001 of this utility model.

[0053] 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.

[0054] 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.

[0055] like Figure 5As shown, in the assembled state of the valve body assembly 100, the valve seat 131 and the valve cover 132 are fixedly installed to the two ends of the shell 140 in the axial direction o. The fixed connection can be interference fit, threaded connection, welding, etc., or can be connected by other parts, such as clamped together by a snap spring. The electromagnet 110 is arranged in the shell 140, the fixed magnetic yoke 120 is arranged between the valve seat 131 and the electromagnet 110, the power plug 150 is installed at the valve cover 132, and the valve sleeve 160 is arranged on the inner side of the electromagnet 110. The dynamic sealing assembly 170 is arranged between the valve seat 131 and the fixed magnetic yoke 120 in the axial direction o and is clamped by the valve seat 131 and the fixed magnetic yoke 120. The outer side of the valve seat 131 and the shell 140 are respectively provided with a mounting sealing ring 180.

[0056] From Figure 5 It can be seen that in some embodiments of the utility model, the air inlet 101, the air outlet 102 and the airflow passage 103 of the valve body assembly 100 are all formed on the valve seat 131. Among them, the air inlet 101 is formed at one end of the valve seat 131 in the axial direction o, and the air outlet 102 is formed on the peripheral wall of the valve seat 131. The valve seat 131 is in the axial direction o, and an inwardly protruding annular structure (not marked in the figure) is arranged between the air inlet 101 and the air outlet 102. The side of the annular structure close to the fixed magnetic yoke 120 is provided with a tapered ring 1311. The tapered ring 1311 is used to abut against the spool assembly 200 and thus block the airflow passage 103.

[0057] In addition, in other embodiments of the utility model, at least one of the fixed magnetic yoke 120, the valve seat 131, the valve cover 132, the shell 140, the power plug 150, the valve sleeve 160, the dynamic sealing assembly 170 and the mounting sealing ring 180 can be omitted by those skilled in the art as needed. For example, the setting of the valve sleeve 160 can be omitted.

[0058] As Figure 6 shown, in some embodiments of the utility model, the valve body assembly 100 further comprises a stop surface 121 arranged on the fixed magnetic yoke 120, which is used to stop the damping ring 310, so that the damping ring 310 is matched with the spool assembly 200.

[0059] As Figure 1 , Figure 2 and Figure 7 shown, in some embodiments of the utility model, the spool assembly 200 further comprises a valve plug 220 fixed to the valve rod 210 and a movable magnetic yoke 230.

[0060] Among them, the valve plug 220 is used for on-off of the airflow passage 103. The movable magnetic yoke 230 is matched with the electromagnet 110 to move to a position under the action of the energized electromagnet 110 to make the valve plug 220 communicate or block the airflow passage 103 (such asFigure 12 and Figure 13 as shown).

[0061] As Figure 7 shown, in some embodiments of the present application, the valve plug 220 and the valve stem 210 can be fixed together in the form of interference fit. Of course, those skilled in the art can also make the valve plug 220 and the valve stem 210 fixed together in the form of threaded connection, welding or any other feasible way according to the needs.

[0062] Correspondingly, the movable magnetic yoke 230 and the valve stem 210 can be fixed together in the form of interference fit. Of course, those skilled in the art can also make the movable magnetic yoke 230 and the valve stem 210 fixed together in the form of threaded connection, welding or any other feasible way according to the needs.

[0063] Continuing to refer to Figure 7 In some embodiments of the present application, the valve plug 220 is provided with an end face sealing ring 221 on the side away from the fixed magnetic yoke 120, and the end face sealing ring 221 is adapted to the tapered ring 1311 in the valve seat 131. When the end face sealing ring 221 abuts against the tapered ring 1311 in the valve seat 131, the end face sealing ring 221 and the valve plug 220 jointly block the communication of the airflow passage 103.

[0064] Continuing to refer to Figure 7 In some embodiments of the present application, the valve plug 220 is provided with a damping member 222 on the side away from the fixed magnetic yoke 120, and the damping member 222 is used to abut against the fixed magnetic yoke 120 to alleviate the impact of the valve core assembly 200 on the valve body assembly 100.

[0065] Exemplarily, the valve plug 220 is provided with an annular recess (not shown in the figure), and the damping member 222 includes an annular portion (not labeled in the figure) embedded in the annular recess and a plurality of protruding portions (not labeled in the figure) provided on the annular portion. The damping 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.

[0066] As Figure 7 and Figure 8 shown, in some embodiments of the present application, the valve stem 210 can be further provided with an annular shoulder 211, and the annular shoulder 211 is in sliding contact with the damping ring 310, so that the valve stem 210 is only interference-fitted with the damping ring 310 through the annular shoulder 211, thereby ensuring that the damping device 300 can provide frictional damping for the valve stem 210 while facilitating the assembly personnel to insert the valve stem 210 into the damping ring 310.

[0067] Of course, in other embodiments of the present application, the skilled in the art can also omit the annular shoulder 211 on the valve stem 210 according to the need.

[0068] As shown in Figures 9 to 13 , the damping device 300 further comprises a mounting seat 320. The mounting seat 320 is fixedly mounted into the valve body assembly 100 (as shown in Figure 12 and Figure 13 ). Specifically, the mounting seat 320 can be threadedly connected or interference fitted with the valve body assembly 100. The damping ring 310 is mounted into the mounting seat 320 (as shown in Figures 10 to 13 ) and in sliding contact with the valve stem 210. The damping ring 310 can be interference fitted with the mounting seat 320 or integrally formed. Moreover, the damping ring 310 is an annular member made of rubber or elastic plastic.

[0069] As shown in Figures 9 to 11 , the damping ring 310 is arranged as a concave spring, and the damping ring 310 is fixedly connected with the valve body assembly 100 in its axial direction o and in sliding contact with the spool assembly 200.

[0070] As shown in Figure 11 , the mounting seat 320 is arranged as an annular member, and the mounting seat 320 is provided with an inner flange 321 for stopping the damping ring 310 from being pulled out of the mounting seat 320 during use.

[0071] As shown in Figure 12 and Figure 13 , in the assembled state, the end of the damping ring 310 away from the inner flange 321 is in abutment with the stop surface 121 on the fixed yoke 120, so as to prevent the damping ring 310 from moving along the axial direction o under the action of the stop surface 121 and the inner flange 321. The end of the mounting seat 320 away from the inner flange 321 can or can not be in abutment with the stop surface 121 on the fixed yoke 120.

[0072] As shown in Figures 9 to 11 , in some embodiments of the present application, the inner side of the damping ring 310 is provided with a plurality of abutting rings 312 and a plurality of annular grooves 313, and the plurality of abutting rings 312 and the plurality of annular grooves 313 are alternately distributed along the axial direction o of the damping ring 310, so that the abutting ring 312 can deform along the axial direction o when subjected to the radial r extrusion force.

[0073] Further, the gas guide channel 311 can be arranged on the inner side of the damping ring 310 and penetrate through the plurality of abutting rings 312, so as to ensure that the gas flow can penetrate through the damping ring 310.

[0074] Of course, the air guide passage 311 can also be set in any other feasible form as required by those skilled in the art. For example, the air guide passage 311 can be set as a through hole penetrating through the damping ring 310, or as a groove on the outer circumferential surface of the damping ring 310.

[0075] In addition, in other embodiments of the present application, the damping device 300 can also be set in any other feasible form and / or at any other feasible position as required by those skilled in the art. Examples are given below.

[0076] Example one: The mounting seat 320 is omitted, and the damping ring 310 is directly mounted to the fixed magnetic yoke 120. For example, an annular clamping groove can be formed on the inner side of the fixed magnetic yoke 120, and a clamping spring is installed in the annular clamping groove after the damping ring 310 is mounted to the fixed magnetic yoke 120, so as to fix the damping ring 310 to the fixed magnetic yoke 120.

[0077] Example two: The damping device 300 is arranged between the valve sleeve 160 and the movable magnetic yoke 230. For example, the mounting seat 320 is in interference fit with the valve sleeve 160, and the damping ring 310 is in sliding contact with the movable magnetic yoke 230.

[0078] Example three: The mounting seat 320 is omitted, and an annular groove is arranged on the valve rod 210, and the damping ring 310 is embedded in the annular groove.

[0079] As shown in Figure 1 , Figure 2 , Figure 12 and Figure 13 , in some embodiments of the present application, the air flow on-off valve 001 can further include a reset spring 400 arranged between the valve body assembly 100 and the valve core assembly 200, which is used to drive the valve core assembly 200 to reset to a position where the valve plug 220 blocks or communicates the air flow passage 103.

[0080] As shown in Figure 12 and Figure 13 , the reset spring 400 is sleeved on the outer side of the valve rod 210, and the two ends in the axial direction o are respectively in abutment with the fixed magnetic yoke 120 and the movable magnetic yoke 230. The structures of the fixed magnetic yoke 120 and the movable magnetic yoke 230 in abutment with the reset spring 400 are described in Figures 5 to 7 , Figure 12 and Figure 13 .

[0081] In some embodiments of the utility model, fixed magnetic yoke 120 and movable magnetic yoke 230 can be made of materials with good magnetic conductivity, such as iron, silicon steel, stainless steel, etc. So that the magnetic field generated when electromagnet 110 is energized simultaneously acts on movable magnetic yoke 230 and fixed magnetic yoke 120, thereby making movable magnetic yoke 230 move towards fixed magnetic yoke 120.

[0082] The working principle of the air flow on-off valve 001 in some embodiments of the utility model will be briefly explained below with reference to Figure 12 And Figure 13 .

[0083] As shown in Figure 12 , in the state that electromagnet 110 is de-energized, movable magnetic yoke 230 and fixed magnetic yoke 120 are away from each other under the action of reset spring 400, and thus make valve core assembly 200 open air inlet 101, making air inlet 101 and air outlet 102 conductive. In this state, gas can flow from air inlet 101 to air outlet 102.

[0084] When electromagnet 110 is energized, the magnetic field generated by electromagnet 110 acts on movable magnetic yoke 230 and fixed magnetic yoke 120, and makes movable magnetic yoke 230 and fixed magnetic yoke 120 generate magnetic force attracting each other. The magnetic force overcomes the elastic force of reset spring 400, drives valve core assembly 200 to move from the position shown in Figure 12 to the position shown in Figure 13 . In this process, frictional damping occurs between moving valve rod 210 and damping ring 310 to reduce the moving speed of valve core assembly 200 and weaken the impact force of valve core assembly 200 on valve seat 131.

[0085] As shown in Figure 13 , in the state that electromagnet 110 is energized, valve plug 220 abuts against conical ring 1311 on valve seat 131, blocking air flow passage 103.

[0086] When electromagnet 110 is de-energized, reset spring 400 drives valve core assembly 200 to move from the position shown in Figure 13 to the position shown in Figure 12 . In this process, frictional damping occurs between moving valve rod 210 and damping ring 310 to reduce the moving speed of valve core assembly 200 and weaken the impact force of valve core assembly 200 on fixed magnetic yoke 120.

[0087] Further, in some embodiments of the utility model, valve sleeve 160 and movable magnetic yoke 230 can be gap-fitted to allow gas to reciprocate between the cavities on both sides of movable magnetic yoke 230, avoiding the generation of a large air pressure difference and affecting the movement of valve core assembly 200.

[0088] Based on the foregoing description, those skilled in the art can understand that the utility model discloses a damping device 300 with a damping ring 310 is arranged between the valve body assembly 100 and the valve core assembly 200, the impact force of the valve core assembly 200 to the valve body assembly 100 is weakened, thereby the noise when the airflow on-off valve 001 is operated is reduced.

[0089] So far, the technical scheme of the utility model has been described in combination with the foregoing multiple embodiments, but those skilled in the art can easily understand that the protection scope of the utility model is not limited to these specific embodiments. On the premise of not deviating from the technical principles of the utility model, those skilled in the art can disassemble and combine the technical schemes in the above-mentioned various embodiments, and can make equivalent changes or replacements to the related technical features, and any change, equivalent replacement, improvement, etc. within the technical concept and / or technical principles of the utility model will fall within the protection scope of the utility model.

[0090] Finally, it needs to be pointed out that in the utility model, the term "communication" means fluid communication to allow fluid (such as air, liquid) to flow between two in communication with each other. And the "communication" can be fluid leakage-free, flowing between two in communication with each other, or can be fluid slightly leaking, flowing between two in communication with each other.

Claims

1. An air flow shut-off valve, characterized by Comprising: a valve body assembly defining an air inlet for connecting an upstream air path, an air outlet for connecting a downstream air path, and an air flow passage for communicating the air inlet with the air outlet; the valve body assembly further comprising an electromagnet; a valve core assembly disposed in the valve body assembly and comprising a valve stem driven by the electromagnet to control opening and closing of the air flow passage by axial movement of the valve stem; a damping device comprising a damping ring radially disposed between the valve body assembly and the valve stem to impede axial movement of the valve stem; the damping ring being provided with a gas guide passage communicating between axial sides of the damping ring.

2. The air flow on-off valve according to claim 1, wherein: the damping ring is fixedly mounted in the valve body assembly, and the damping ring is in sliding contact with the valve stem.

3. The air flow on-off valve according to claim 2, wherein: the damping device further comprises a mounting seat, the mounting seat is fixedly mounted in the valve body assembly, and the damping ring is mounted in the mounting seat.

4. The air flow on-off valve according to claim 3, wherein: the mounting seat is annular, and the mounting seat is provided with an inner flange for stopping the damping ring; the valve body assembly comprises a stop surface for stopping one end of the damping ring away from the inner flange to prevent axial movement of the damping ring.

5. The air flow on-off valve according to claim 4, wherein: the mounting seat is threadedly connected or interference-fitted with the valve body assembly; and / or, the damping ring is interference-fitted with the mounting seat or integrally formed.

6. The air flow on-off valve according to any one of claims 2 to 5, wherein: an inner side of the damping ring is provided with a plurality of abutting rings and a plurality of annular grooves, the plurality of abutting rings and the plurality of annular grooves being alternately distributed along an axial direction of the damping ring to enable the abutting rings to deform along the axial direction when subjected to radial extrusion force.

7. The air flow on-off valve according to claim 6, wherein: the gas guide passage is provided on the inner side of the damping ring and penetrates through the plurality of abutting rings; and / or, the damping ring is an annular member made of rubber or elastic plastic.

8. The air flow on-off valve according to any one of claims 1 to 5, wherein: the valve core assembly comprises a valve plug fixed to the valve stem and a movable magnetic yoke, the valve plug is used to control opening and closing of the air flow passage; the movable magnetic yoke is adapted to the electromagnet to move to a position for making the valve plug communicate or block the air flow passage under the action of the electromagnet when energized.

9. The air flow on-off valve according to claim 8, wherein: the valve stem is provided with an annular shoulder in sliding contact with the damping ring; and / or, the valve core assembly further comprises a fixed magnetic yoke for fixing the damping device; the air flow on-off valve is configured such that the magnetic field generated by the electromagnet acts on the movable magnetic yoke and the fixed magnetic yoke simultaneously to move the movable magnetic yoke towards the fixed magnetic yoke when the electromagnet is energized.

10. The air flow on-off valve according to claim 8, wherein: The air flow on-off valve further comprises a reset spring arranged between the valve body assembly and the valve core assembly, and the reset spring is used to drive the valve core assembly to reset to a position that makes the valve plug block or communicate the air flow passage.

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