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. In order to solve the problem that noise is large when an existing airflow on-off valve acts, the airflow on-off valve comprises a valve body assembly, a valve element assembly and a damping ring. The valve body assembly defines an air inlet, an air outlet and an airflow channel communicating the air inlet with the air outlet. 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 ring comprises a fixing part and a friction part, the fixing part is fixedly connected with one of the valve body assembly and the valve rod, the friction part presses the other one of the valve body assembly and the valve rod in the radial direction, and the friction part generates different deformation quantities when the valve rod moves in different directions so as to provide different damping forces for the valve rod moving in the different directions. 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 makes the airflow passage conductive or blocked, 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] To achieve the above purpose, the utility model provides an airflow on-off valve, comprising:

[0006] a valve body assembly defining an air inlet, an air outlet and an airflow passage connecting the air inlet and the air outlet; the valve body assembly further comprises an electromagnet;

[0007] 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;

[0008] a damping ring comprising a fixed part and a friction part, the fixed part is fixedly connected with one of the valve body assembly and the valve rod, the friction part compresses the other one of the valve body assembly and the valve rod in the radial direction, and the friction part generates different deformation amounts when the valve rod moves in different directions to provide different damping forces to the valve rod moving in different directions.

[0009] Optionally, the fixed part is fixedly connected with the valve body assembly; the friction part is arranged on the inner side in the radial direction of the fixed part and comprises at least one tapered friction ring, so that the friction part is in sliding contact with the valve rod through the friction ring.

[0010] Optionally, the friction ring is inclined from outside to inside towards the direction of opening the gas flow passage towards the valve core assembly as a whole.

[0011] Optionally, the axial end of the friction ring away from the gas flow passage is radially parallel to the friction ring; and the axial end of the friction ring close to the gas flow passage is inclined from outside to inside towards the direction away from the gas flow passage.

[0012] Optionally, the valve stem is provided with an annular shoulder, and the valve stem is in sliding contact with the friction part through the annular shoulder.

[0013] Optionally, the friction part reduces or restores the deformation when the valve stem moves to the end of stroke.

[0014] Optionally, the annular shoulder close to the axial end of the gas flow passage is provided as an annular taper surface, and is referred to as a proximal taper surface; and the annular shoulder away from the axial end of the gas flow passage is provided as an annular taper surface, and is referred to as a distal taper surface.

[0015] Optionally, the taper of the proximal taper surface is selected from any value in the range of 10° to 20°; and / or, the taper of the distal taper surface is selected from any value in the range of 20° to 40°.

[0016] Optionally, 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 the opening and closing of the gas flow passage; and the movable magnetic yoke is adapted to the electromagnet to move to a position under the action of the energized electromagnet to make the valve plug open or block the gas flow passage.

[0017] Optionally, the gas flow interrupter 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 to block or open the gas flow passage.

[0018] Based on the foregoing description, those skilled in the art can understand that, in the technical solutions of the foregoing utility model, by arranging the damping ring between the valve body assembly and the valve stem, and fixing the fixing part of the damping ring to one of the valve body assembly and the valve stem, the friction part of the damping ring is pressed against the other one of the valve body assembly and the valve stem in the radial direction, and the friction part generates different deformation amounts when the valve stem moves in different directions, so that different damping forces can be provided to the valve stem moving in different directions. In this way, the impact force of the valve core assembly on the valve body assembly can be weakened, and thus the noise during the action of the gas flow interrupter valve is reduced. Moreover, since the damping forces obtained when the valve stem moves in different directions are different, the valve core assembly can weaken the noise as much as possible when opening or blocking the gas flow passage, and can obtain a faster response rate when moving reversely and blocking or opening the gas flow passage.

[0019] Further, by setting the annular shoulder on the valve rod, the valve rod is in sliding contact with the friction part through the annular shoulder, and the friction part reduces or restores the deformation when the valve rod moves to the end of the stroke, so that irreversible change of the friction part is avoided, the extrusion force of the friction part on the annular shoulder is reduced, and the friction damping force provided by the friction part to the annular shoulder is reduced.

[0020] Other beneficial effects of the utility model will be described in detail in the following with reference to the drawings, so that the improvement purpose, features and advantages of the utility model can be more clearly understood by the person skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the utility model, the following will describe some embodiments of the 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 utility model are not necessarily drawn according to scale. In the drawings:

[0022] Figure 1 is the structure exploded view of the airflow on-off valve in some embodiments of the utility model (first axonometric view angle);

[0023] Figure 2 is the structure exploded view of the airflow on-off valve in some embodiments of the utility model (second axonometric view angle);

[0024] Figure 3 is the perspective view of the airflow on-off valve in some embodiments of the utility model (first axonometric view angle);

[0025] Figure 4 is the perspective view of the airflow on-off valve in some embodiments of the utility model (second axonometric view angle);

[0026] Figure 5 is Figure 4 the sectional view of the valve body assembly along the A-A direction in the valve body assembly;

[0027] Figure 6 is Figure 4 the sectional view of the fixed magnetic yoke along the A-A direction in the fixed magnetic yoke;

[0028] Figure 7 is Figure 4 the sectional view of the valve core assembly along the A-A direction in the valve core assembly;

[0029] Figure 8 is Figure 1 and Figure 2 the radial side view of the valve rod in the valve rod;

[0030] Figure 9 is Figure 1 and Figure 2Figure 7 is a perspective view of the damping ring;

[0031] Figure 10 Figure 8 is a cross-sectional view of the damping ring along the B-B direction; Figure 9

[0032] Figure 11 Figure 9 is a cross-sectional view of the damping ring along the B-B direction; Figure 9

[0033] Figure 12 Figure 10 is a cross-sectional view of the airflow on-off valve along the A-A direction (open state); Figure 4

[0034] Figure 13 Figure 11 is a schematic view of the relative position of the valve stem and the damping ring; Figure 12

[0035] Figure 14 Figure 12 is a cross-sectional view of the airflow on-off valve along the A-A direction (closed state); Figure 4

[0036] Figure 15 Figure 13 is a schematic view of the relative position of the valve stem and the damping ring; Figure 14

[0037] Figure 14 is a schematic view of the relative position of the valve stem and the damping ring in another embodiment of the present application. Figure 16 Figure 15 is a legend of the reference numerals.

[0038]

[0039] 001 Airflow on-off valve

[0040] 100 Valve body assembly; 101 Inlet; 102 Outlet; 103 Airflow passage; 110 Electromagnet; 120 Fixed magnetic 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

[0041] 200 Valve core assembly; 210 Valve stem; 211 Annular shoulder; 2111 Proximal conical surface; 2112 Distal conical surface; 220 Valve plug; 221 End face sealing ring; 222 Shock absorbing member; 230 Mobile magnetic yoke

[0042] 300 Damping ring; 310 Fixed portion; 320 Friction portion; 321 Friction ring

[0043] 400 Reset spring

[0044] r Radial; o Axial DETAILED DESCRIPTION ​​​​​​

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 ring 300.

[0049] like Figures 1 to 5 As shown, the valve body assembly 100 defines an air inlet 101, an air outlet 102, 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.

[0050] 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.

[0051] As shown in Figures 9 to 16 , the damping ring 300 comprises a fixed part 310 and a friction part 320, the fixed part 310 is fixedly connected with one of the valve body assembly 100 and the valve stem 210, the friction part 320 is pressed against the other of the valve body assembly 100 and the valve stem 210 along the radial direction r, and the friction part 320 generates different deformation amounts when the valve stem 210 moves in different directions, so as to provide different damping forces to the valve stem 210 moving in different directions.

[0052] In Figure 12 and Figure 14 the embodiments shown, the fixed part 310 is fixedly connected with the valve body assembly 100, and the friction part 320 is in sliding contact with the valve stem 210.

[0053] Of course, the skilled in the art can also make the fixed part 310 fixedly connected with the valve stem 210, make the friction part 320 in sliding contact with the valve body assembly 100, and make the friction part 320 located outside the fixed part 310 along the radial direction r, according to the needs.

[0054] The skilled in the art can understand that, by setting the damping ring 300 between the valve body assembly 100 and the valve stem 210, and making the fixed part 310 of the damping ring 300 fixedly connected with one of the valve body assembly 100 and the valve stem 210, making the friction part 320 of the damping ring 300 pressed against the other of the valve body assembly 100 and the valve stem 210 along the radial direction r, and making the friction part 320 generate different deformation amounts when the valve stem 210 moves in different directions, different damping forces can be provided to the valve stem 210 moving in different directions. In this way, the impact force of the valve core assembly 200 on the valve body assembly 100 can be weakened, and thus the noise of the airflow on-off valve 001 when it is actuated can be reduced. Moreover, since the damping forces obtained when the valve stem 210 moves in different directions are different, the valve core assembly 200 can weaken the noise as much as possible when it opens or blocks the airflow passage 103, and can obtain a faster response rate when it moves reversely and blocks or opens the airflow passage 103.

[0055] The airflow on-off valve 001 of the utility model will be further described below with reference to Figures 1 to 16 .

[0056] As shown in Figure 5 , in some embodiments of the utility model, the valve body assembly 100 further comprises a fixed magnetic yoke 120, a valve seat 131, a valve cover 132, an outer shell 140, a power plug 150, a valve sleeve 160, a dynamic sealing assembly 170, and a mounting sealing ring 180, etc.

[0057] The fixed magnetic yoke 120 is used to restrict the magnetic field generated by the electromagnet 110, so as to improve the use efficiency of the magnetic field. The valve seat 131 and the valve cover 132 are respectively arranged at two ends of the shell 140 in the axial direction o and are fixedly connected with the shell 140, so as to encapsulate the electromagnet 110, the fixed magnetic yoke 120, the valve sleeve 160, the dynamic sealing assembly 170 and other components in the shell 140 for protection. The power plug 150 is installed on the valve cover 132 and is electrically connected with the electromagnet 110, so as to provide power for the electromagnet 110. The valve sleeve 160 is used to accommodate a part of the valve core assembly 200. The dynamic sealing assembly 170 is in sliding sealing with the valve core assembly 200, so as to prevent gas from leaking from the high-pressure side to the low-pressure side in the axial direction o of the dynamic sealing assembly 170. The installation sealing ring 180 is used to realize sealing between the valve body assembly 100 and an installation object (such as a metal block with an installation hole, a pipe and the like), so as to prevent high-pressure gas from leaking.

[0058] As shown in Figure 5 , in the assembled state of the valve body assembly 100, the valve seat 131 and the valve cover 132 are respectively fixedly installed at two ends of the shell 140 in the axial direction o. The fixed connection can be interference fit, threaded connection, welding and the like, or can be connected by means of other parts, such as clamping together by means of a clamping 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 in the 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. The valve seat 131 and the outer side of the shell 140 are respectively provided with the installation sealing ring 180.

[0059] As can be seen from Figure 5 , 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 valve core assembly 200 and thus block the airflow passage 103.

[0060] 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 installation sealing ring 180 can be omitted according to the needs of those skilled in the art. For example, the setting of the valve sleeve 160 can be omitted.

[0061] As Figure 6 shown, in some embodiments of the present application, 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 300 so as to adapt the damping ring to the valve core assembly 200.

[0062] As Figure 1 , Figure 2 and Figure 7 shown, in some embodiments of the present application, the valve core assembly 200 further comprises a valve plug 220 fixed to the valve stem 210 and a movable magnetic yoke 230.

[0063] The valve plug 220 is used to control the on-off of the air flow passage 103. The movable magnetic yoke 230 is adapted to the electromagnet 110 to move to a position (as shown in Figure 12 and Figure 14 ) under the action of the energized electromagnet 110 so as to make the valve plug 220 communicate or block the air flow passage 103.

[0064] 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 an interference fit manner. Of course, those skilled in the art can also make the valve plug 220 and the valve stem 210 fixed together in any feasible manner such as threaded connection, welding, etc. according to the needs.

[0065] Correspondingly, the movable magnetic yoke 230 and the valve stem 210 can be fixed together in an interference fit manner. Of course, those skilled in the art can also make the movable magnetic yoke 230 and the valve stem 210 fixed together in any feasible manner such as threaded connection, welding, etc. according to the needs.

[0066] 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, which 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 air flow passage 103.

[0067] 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, which 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.

[0068] Exemplarily, the valve plug 220 is provided with an annular groove (not shown in the figure), and the damping member 222 comprises an annular portion (not labeled in the figure) embedded in the annular groove 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 air flow passage 103.

[0069] As shown in Figure 1 , Figure 2 , Figure 7 and Figure 8 , the valve stem 210 is provided with an annular shoulder 211, and the valve stem 210 is in sliding contact with the friction portion 320 through the annular shoulder 211.

[0070] As shown in Figure 8 , the annular shoulder 211 is provided with an annular taper surface near the axial end of the air flow passage 103, and is denoted as a proximal taper surface 2111. The annular shoulder 211 is provided with an annular taper surface away from the axial end of the air flow passage 103, and is denoted as a distal taper surface 2112.

[0071] As can be understood by those skilled in the art, the provision of the proximal taper surface 2111 and the distal taper surface 2112 enables the friction portion 320 of the damping ring 300 to slide onto the annular shoulder 211, avoiding the situation that the friction portion 320 cannot slide onto the annular shoulder 211 due to the presence of a step at the axial end of the annular shoulder 211.

[0072] Further, the friction portion 320 of the damping ring 300 can be in clearance fit with the portion of the valve stem 210 other than the annular shoulder 211, so as to enable the damping ring 300 to slide freely relative to the portion.

[0073] As shown in Figures 12 to 14 , in some embodiments of the present application, the friction portion 320 reduces or recovers deformation when the valve stem 210 moves to the end of stroke. In this way, the irreversible change of the friction portion 320 when it remains at the same deformation for a long time is avoided, so as to reduce the extrusion force of the friction portion 320 on the annular shoulder 211, and further reduce the friction damping force provided by the friction portion 320 to the annular shoulder 211.

[0074] Returning to continue referring to Figure 8The taper α of the proximal conical surface 2111 is selected from any value between 10° and 20°, so that the annular shoulder 211 quickly squeezes the friction part 320 to deform during the process of the valve core assembly 200 blocking the airflow passage 103. This taper α avoids jamming of the valve core assembly 200 during movement and ensures that the friction part 320 provides frictional resistance to the valve stem 210 at a response frequency when the valve core assembly 200 moves. Specifically, the taper α can be any feasible value such as 10°, 12°, 14°, 15°, 18°, or 20°.

[0075] Accordingly, the taper β of the distal conical surface 2112 is selected from any value between 20° and 40°, so as to delay the deformation recovery of the friction part 320 as much as possible during the process of the valve core assembly 200 blocking the airflow passage 103, and to ensure that the valve core assembly 200 can quickly open the airflow passage 103. Based on this, the taper β can be any feasible value such as 20°, 23°, 27°, 30°, 35°, 40°, etc.

[0076] like Figures 9 to 11 As shown, in some embodiments of this utility model, the friction part 320 is disposed on the inner side of the fixing part 310 in the radial direction r, so that the fixing part 310 is fixedly connected to the valve body assembly 100.

[0077] Specifically, the fixing part 310 is inserted into the fixing yoke 120, and the fixing part 310 abuts against the stop surface 121. Moreover, the fixing part 310 and the fixing yoke 120 are interference-fitted to fix the fixing part 310 to the fixing yoke 120.

[0078] Furthermore, in other embodiments of this utility model, those skilled in the art can connect the fixing part 310 and the fixing yoke 120 in any other feasible manner as needed. For example, an external thread can be formed on the fixing part 310, and an internal thread can be formed in the fixing yoke 120, so that the two are fixed together by a threaded connection. As another example, an annular groove can be formed on the inner side of the fixing yoke 120, and after the damping ring 300 is installed into the fixing yoke 120, a retaining ring can be installed in the annular groove to fix the damping ring 300 into the fixing yoke 120.

[0079] Furthermore, the fixing part 310 and the friction part 320 can be made of the same material or different materials.

[0080] When the fixing part 310 and the friction part 320 are made of the same material, the material can be elastic rubber, silicone, plastic, etc.

[0081] When the fixed part 310 and the friction part 320 are made of different materials, the material of the friction part 320 can be rubber, silica gel, plastic, etc. with elasticity, and the fixed part 310 can be metal, rubber, plastic, etc. The fixed part 310 and the friction part 320 can be set as a whole by means of bonding, interference fit, injection molding, etc.

[0082] As shown in Figure 10 and Figure 11 , in some embodiments of the utility model, the friction part 320 includes at least one tapered friction ring 321 (for example, four as shown in Figure 10 and Figure 11 ), so that the friction part 320 is in sliding contact with the valve stem 210 through the friction ring 321.

[0083] As can be seen from Figure 11 , the friction ring 321 as a whole is inclined from the outside to the inside towards the direction of opening the air flow passage 103 of the valve core assembly 200, so as to provide a larger damping force to the valve stem 210 in the process of blocking the air flow passage 103 of the valve core assembly 200, and vice versa.

[0084] As shown in Figure 11 , in some embodiments of the utility model, the axial end surface of the friction ring 321 away from the air flow passage 103 is parallel to the radial direction r of the friction ring 321. Moreover, the axial end surface of the friction ring 321 close to the air flow passage 103 is inclined from the outside to the inside towards the direction away from the air flow passage 103.

[0085] In addition, in other embodiments of the utility model, those skilled in the art can also set the friction ring 321 to other any feasible structure according to the needs. For example, both axial end surfaces of the friction ring 321 are inclined from the outside to the inside towards the direction away from the air flow passage 103.

[0086] As shown in Figure 1 , Figure 2 , Figure 12 and Figure 14 , in some embodiments of the utility model, 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 the position of blocking or opening the air flow passage 103 by the valve plug 220.

[0087] As shown in Figure 12 and Figure 14 , the reset spring 400 is sleeved on the outside of the valve stem 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 structure of the fixed magnetic yoke 120 and the movable magnetic yoke 230 in abutment with the reset spring 400 is described in Figures 5 to 7 ,Figure 12 and Figure 14 .

[0088] 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.

[0089] The following reference Figures 12 to 15 The working principle of the pneumatic shut-off valve 001 in some embodiments of this utility model will be briefly explained.

[0090] like Figure 12 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.

[0091] Of course, in practical applications, the air inlet 101 and the air outlet 102 can be interchanged so that the gas flows from the air outlet 102 to the air inlet 101.

[0092] like Figure 13 As shown, when the electromagnet 110 is de-energized, all friction rings 321 are located on one side of the proximal conical surface 2111 of the annular shoulder 211, with one friction ring 321 close to the proximal conical surface 2111 in clearance fit or abutment. Furthermore, none of the friction rings 321 undergo deformation.

[0093] 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 12 Move to the position shown Figure 14 The position shown (the relative position of valve stem 210 and friction ring 321 from...) Figure 13 Transform to Figure 15 During this process, the annular shoulder 211 will have an interference fit with the friction ring 321, and thus the annular shoulder 211 will press the friction ring 321 outward along the radial direction r, thereby causing the friction ring 321 to deform and provide friction damping force to the valve core assembly 200, so as 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.

[0094] like Figure 14As shown, in the state that the electromagnet 110 is energized, the valve plug 220 abuts against the conical ring 1311 on the valve seat 131 to block the air flow passage 103.

[0095] As shown, in the state that the electromagnet 110 is energized, the valve plug 220 abuts against the conical ring 1311 on the valve seat 131 to block the air flow passage 103. Figure 15 As shown, in the state that the electromagnet 110 is energized, part of the friction rings 321 are located on one side of the distal end conical surface 2112 of the annular shoulder 211, and part of the friction rings 321 are still pressed against the annular shoulder 211 along the radial direction r.

[0096] Of course, in other embodiments of the present application, the skilled in the art can also make all the friction rings 321 be located on one side of the distal end conical surface 2112 of the annular shoulder 211, and make one friction ring 321 close to the distal end conical surface 2112 be in clearance fit or abut against the distal end conical surface 2112 according to the needs, as shown. Figure 16

[0097] When the electromagnet 110 is de-energized, the reset spring 400 drives the valve core assembly 200 to move from the position shown in Figure 14 to the position shown in Figure 12 (the relative position of the valve rod 210 and the friction ring 321 changes from Figure 15 to Figure 13 ). In this process, the annular shoulder 211 will be in interference fit with the friction ring 321, and thus the annular shoulder 211 will extrude the friction ring 321 outward along the radial direction r, and thus the friction ring 321 will be deformed to provide a friction damping force to the valve core assembly 200 to reduce the moving speed of the valve core assembly 200 and weaken the impact force of the valve core assembly 200 to the fixed yoke 120.

[0098] As can be seen from Figures 12 to 15 , since the friction ring 321 as a whole is inclined from outside to inside towards the direction in which the valve core assembly 200 opens the air flow passage 103, in the process that the electromagnet 110 is energized to drive the valve core assembly 200 to move towards the air inlet 101 (from the position shown in Figure 12 to the position shown in Figure 14 ), the friction ring 321 is not easy to deform, the radial extrusion force of the annular shoulder 211 is large, and the damping force is also large. Correspondingly, in the process that the electromagnet 110 is de-energized and the valve core assembly 200 is driven away from the air inlet 101 by the reset spring 400 (from the position shown in Figure 14 to the position shown in Figure 12 ), the friction ring 321 is easy to deform, the radial extrusion force of the annular shoulder 211 is small, and the damping force is also small.

[0099] ​In this way, the friction ring 321 provides different damping forces for different forces of the electromagnet 110 and the return spring 400, which provides different damping forces for the movement of the spool assembly 200 in different directions, reduces the impact noise generated when the spool assembly 200 acts, and ensures the response rate of the spool assembly 200.

[0100] Further, in some embodiments of the present application, the valve sleeve 160 and the movable magnetic yoke 230 can be gap-fitted to allow gas to flow back and forth between the cavities on both sides of the movable magnetic yoke 230, avoiding the generation of a large air pressure difference and affecting the movement of the spool assembly 200.

[0101] So far, the technical solutions of the present application have been described in combination with the foregoing embodiments, but those skilled in the art can easily understand that the protection scope of the present application is not limited to these specific embodiments. Without deviating from the technical principles of the present application, those skilled in the art can disassemble and combine the technical solutions in each of the above embodiments, or make equivalent changes or replacements to related technical features, and any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the protection scope of the present application.

[0102] Finally, it should be noted that in the present application, the term "communication" means fluid communication to allow fluid (such as air, liquid) to flow between two things in communication with each other. And this "communication" can be fluid leakage-free, flowing between two things in communication with each other, or it can be a little fluid leakage, flowing between two things in communication with each other.

Claims

1. A pneumatic shut-off valve, characterized in that, include: A valve body assembly defines an air inlet, an air outlet, 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 ring includes a fixed portion and a friction portion. The fixed portion is fixedly connected to one of the valve body assembly and the valve stem. The friction portion radially presses against the other of the valve body assembly and the valve stem, and the friction portion generates different deformations when the valve stem moves in different directions to provide different damping forces to the valve stem moving in different directions.

2. The pneumatic shut-off valve according to claim 1, characterized in that, The fixing part is fixedly connected to the valve body assembly; The friction part is disposed on the inner side of the fixing part in the radial direction and includes at least one tapered friction ring so that the friction part slides in contact with the valve stem through the friction ring.

3. The pneumatic shut-off valve according to claim 2, characterized in that, The friction ring is inclined from the outside to the inside in the direction in which the valve core assembly opens the airflow channel.

4. The pneumatic shut-off valve according to claim 3, characterized in that, The axial end face of the friction ring away from the airflow channel is parallel to the radial direction of the friction ring; The axial end face of the friction ring near the airflow channel is inclined from the outside to the inside in a direction away from the airflow channel.

5. The pneumatic shut-off valve according to any one of claims 2 to 4, characterized in that, The valve stem is provided with an annular shoulder, and the valve stem slides in contact with the friction part through the annular shoulder.

6. The pneumatic shut-off valve according to claim 5, characterized in that, The friction element reduces or restores its deformation when the valve stem moves to the end of its stroke.

7. The pneumatic shut-off valve according to claim 6, characterized in that, The axial end of the annular shoulder near the airflow channel is configured as an annular conical surface, and is referred to as the proximal conical surface. The axial end of the annular shoulder away from the airflow channel is set as an annular conical surface, and is denoted as the distal conical surface.

8. The pneumatic shut-off valve according to claim 7, characterized in that, The taper of the proximal conical surface is selected from any value between 10° and 20°; and / or, The taper of the distal conical surface is selected from any value between 20° and 40°.

9. The pneumatic shut-off valve according to any one of claims 1 to 4, 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 blocks the airflow passage under the action of the energized electromagnet.

10. The gas flow shut-off valve according to any one of claims 1 to 4, characterized in that, The airflow 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 the position of blocking or opening the airflow passage.

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