Air flow on-off valve

Abstract

The utility model belongs to the technical field of gas circuit control valve, specifically provides a gas flow on-off valve. The utility model aims at solving the problem of the larger noise of existing gas flow on-off valve action. For this, the utility model's gas flow on-off valve includes valve body subassembly, valve core subassembly and back pressure subassembly. The utility model limits the far end variable volume chamber and the near end variable volume chamber who are located in the axial opposite two sides of the movable magnetic yoke by making valve core subassembly and valve body subassembly, sets up the intercommunication channel in the valve core subassembly, limits the damping channel between movable magnetic yoke and valve body subassembly to connect the far end variable volume chamber and the near end variable volume chamber. By the back pressure subassembly is configured to only allow the gas to flow from one to another via the intercommunication channel in the far end variable volume chamber and the near end variable volume chamber, not only weakens the impact force of valve core subassembly to valve body subassembly, reduces the noise when the gas flow on-off valve action, but also ensures the response rate when valve core subassembly moves in one direction.

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, airflow on-off 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 automobile suspension systems, airflow on-off valves play a key role in adjusting suspension damping, optimizing ride stability and handling performance. Airflow on-off valves typically regulate 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] Existing electromagnetically driven airflow on-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 on-off control cavity that connects 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 between the air inlet and the air outlet. When the valve core assembly moves to a position that opens or blocks the airflow on-off control cavity, it inevitably generates a large impact force on the valve body assembly, causing a large noise and affecting the ride comfort of the passengers. SUMMARY

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

[0005] To achieve the above purpose, the utility model provides an airflow on-off valve, which includes a valve body assembly and a valve core assembly.

[0006] The valve body assembly forms an air inlet for connecting the upstream air circuit, an air outlet for connecting the downstream air circuit, and an airflow on-off control cavity that connects the air inlet and the air outlet. The valve body assembly further includes an electromagnetic coil for generating electromagnetic force.

[0007] A part of the valve core assembly is located in the airflow on-off control cavity. The valve core assembly includes a valve stem and a movable magnetic yoke that is sleeved on the periphery of the valve stem. The movable magnetic yoke is driven by the electromagnetic force, thereby driving the valve core assembly to move axially to control the on-off between the air inlet and the air outlet through the part of the valve core assembly.

[0008] The valve core assembly and the valve body assembly jointly define a distal variable volume cavity and a proximal variable volume cavity located on the axially opposite sides of the movable magnetic yoke. In the axial direction, the distance between the distal variable volume cavity and the air inlet is greater than the distance between the proximal variable volume cavity and the air inlet.

[0009] The valve core assembly is provided with a communication passage for communicating the distal variable volume cavity and the proximal variable volume cavity;

[0010] The movable magnetic yoke and the valve body assembly define a damping passage for communicating the distal variable volume cavity and the proximal variable volume cavity;

[0011] The gas flow on-off valve further comprises a back pressure assembly mounted on the valve core assembly, which is configured to allow gas to flow from one of the distal variable volume cavity and the proximal variable volume cavity to the other only via the communication passage.

[0012] Optionally, the communication passage is formed on the valve stem, the movable magnetic yoke is provided with a plug hole for plugging the valve stem and a mounting hole for mounting the back pressure assembly, the mounting hole communicates with the plug hole, and the mounting hole is arranged between the plug hole and the distal variable volume cavity.

[0013] Optionally, the back pressure assembly comprises a fixed part fixedly connected with the movable magnetic yoke, a guide rod fixedly connected with the fixed part, a shielding part in sliding connection with the guide rod, and a pre-tightening spring for pressing the shielding part against the fixed part; the fixed part is provided with a gas guide hole, and the shielding part is used to selectively close and open the gas guide hole.

[0014] Optionally, the mounting hole is provided with an annular spring stop surface near one end of the plug hole, the spring stop surface is used to stop the pre-tightening spring away from one end of the shielding part; and / or, the mounting hole is further provided with a fixed stop surface for stopping the fixed part.

[0015] Optionally, the mounting hole is provided as a stepped hole as a whole; and / or, the mounting hole is in threaded connection with the fixed part.

[0016] Optionally, one end of the pre-tightening spring away from the shielding part is in abutment with one end of the valve stem near the distal variable volume cavity.

[0017] Optionally, the damping passage is an axial groove formed on the outer circumferential surface of the movable magnetic yoke.

[0018] Optionally, the damping passage is an annular gap formed between the movable magnetic yoke and the valve body assembly.

[0019] Optionally, the valve body assembly further comprises a valve sleeve, and the damping passage is formed between the valve sleeve and the movable magnetic yoke.

[0020] Optionally, the valve core assembly further comprises a valve plug arranged in the air flow on-off control cavity, the valve plug selectively closes and opens the air inlet to control the on-off between the air inlet and the air outlet.

[0021] Based on the foregoing description, those skilled in the art can understand that, in the technical solutions of the foregoing valve core assembly, by arranging the damping channel and the communication channel for communicating the distal variable volume cavity and the proximal variable volume cavity, and arranging the back pressure assembly for controlling the on-off of the communication channel, different damping forces are provided for the bidirectional flow of the gas between the distal variable volume cavity and the proximal variable volume cavity. Therefore, the valve core assembly not only weakens the impact force of the valve core assembly on the valve body assembly, and reduces the noise when the air flow on-off valve operates, but also ensures the response rate when the valve core assembly moves in one direction.

[0022] Specifically, when the valve core assembly moves in one direction along the axis, the gas flows from one of the distal variable volume cavity and the proximal variable volume cavity to the other via the damping channel. When the moving speed of the valve core assembly is large, the space of the variable volume cavity of the one item is sharply reduced, the gas pressure is sharply increased, and thus the back pressure assembly is opened, so that the gas in the one item also flows via the communication channel, thereby providing a smaller damping force for the movement of the valve core assembly.

[0023] When the valve core assembly moves in the other direction along the axis, the back pressure assembly cannot be opened, and the gas can only flow from the other of the distal variable volume cavity and the proximal variable volume cavity to the one via the damping channel, thereby providing a larger damping force for the movement of the valve core assembly.

[0024] Other beneficial effects of the present application will be described in detail in the following with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improvement purposes, features and advantages of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the present application, the following will describe some embodiments of the present application with reference to the accompanying drawings. Those skilled in the art should understand that the same components or parts indicated by the same reference numerals in different drawings are the same or similar; the drawings of the present application are not necessarily drawn to scale. In the drawings:

[0026] Figure 1 is a structural exploded view (first axonometric perspective) of the air flow on-off valve in some embodiments of the present application;

[0027] Figure 2 is a structural exploded view (second axonometric perspective) of the air flow on-off valve in some embodiments of the present application;

[0028] Figure 3is a perspective view (first axial measurement viewing angle) of the airflow on-off valve in some embodiments of the utility model;

[0029] Figure 4 is a perspective view (second axial measurement viewing angle) of the airflow on-off valve in some embodiments of the utility model;

[0030] Figure 5 is Figure 4 is the sectional view of valve body assembly along A-A direction in the middle;

[0031] Figure 6 is Figure 4 is the sectional view of valve core assembly along A-A direction in the middle;

[0032] Figure 7 is Figure 1 and Figure 2 is the perspective view of movable magnetic yoke in the middle;

[0033] Figure 8 is Figure 7 is the sectional view of movable magnetic yoke along B-B direction in the middle;

[0034] Figure 9 is Figure 1 and Figure 2 is the structural exploded view (first axial measurement viewing angle) of back pressure assembly in the middle;

[0035] Figure 10 is Figure 1 and Figure 2 is the structural exploded view (second axial measurement viewing angle) of back pressure assembly in the middle;

[0036] Figure 11 is Figure 1 and Figure 2 is the perspective view (first axial measurement viewing angle) of back pressure assembly in the middle;

[0037] Figure 12 is Figure 1 and Figure 2 is the perspective view (second axial measurement viewing angle) of back pressure assembly in the middle;

[0038] Figure 13 is Figure 4 is the sectional view (open state) of airflow on-off valve along A-A direction in the middle;

[0039] Figure 14 is Figure 4 is the sectional view (closed state) of airflow on-off valve along A-A direction in the middle;

[0040] Figure 15 is Figure 4 is the sectional view (intermediate process state) of airflow on-off valve along A-A direction in the middle.

[0041] Explanation of reference signs:

[0042] 001、air flow on-off valve;

[0043] 100、valve body assembly;101、air inlet;102、air outlet;103、air flow on-off control cavity;1031、air guide area;1032、pressure equalization area;110、electromagnetic coil;120、fixed magnetic yoke;131、valve seat;1311、conical ring;132、valve cover;140、housing;150、power plug;160、valve sleeve;170、dynamic sealing assembly;180、mounting sealing ring;

[0044] 200、valve core assembly;201、communication channel;202、pressure equalization channel;210、valve stem;220、valve plug;2201、non-circular hole;221、end face sealing ring;222、shock absorbing member;230、movable magnetic yoke;2301、axial sink;231、insertion hole;232、mounting hole;2321、spring stop surface;2322、fixed stop surface;

[0045] 010、distal variable volume cavity;020、proximal variable volume cavity;030、damping channel;

[0046] 300、back pressure assembly;310、fixed part;311、air guide hole;312、fixed hole;320、guide rod;330、shield;340、pre-tightening spring;

[0047] 400、return spring;

[0048] r、radial;o、axial. DETAILED DESCRIPTION

[0049] It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the utility model, rather than all the embodiments of the utility model, and the part of the embodiments are intended to explain the technical principles of the utility model, rather than limit the protection scope of the utility model. Based on the embodiments provided by the utility model, all other embodiments obtained by those skilled in the art without creative labor should still fall within the protection scope of the utility model.

[0050] It should be noted that in the description of the utility model, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and is not intended to indicate or imply that the corresponding device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0051] Further, it needs to be further pointed out that in the description of the utility model, unless another explicit provision and limitation, the term "installation", "connection", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, also can be two elements inside the communication. For the person skilled in the art, the above-mentioned terms can be understood according to the specific meaning in the utility model. For example, the term "installation", "connection", "connect" and "fixed" without special description, specifically can be bolted connection, screw connection, welding, insertion, riveting, fusion, clamping and any feasible connection form.

[0052] As Figures 1 to 15 Indicated, in some embodiments of the utility model, airflow on-off valve 001 includes valve body assembly 100, valve core assembly 200 and back pressure assembly 300.

[0053] As Figures 1 to 5 Indicated, valve body assembly 100 is formed with the air inlet 101 for connecting upstream air path, the air outlet 102 for connecting downstream air path and the airflow on-off control cavity 103 for communicating the air inlet 101 with the air outlet 102. Valve body assembly 100 further includes the electromagnetic coil 110 for generating electromagnetic force.

[0054] As Figure 6 、 Figures 13 to 15 Indicated, the part of valve core assembly 200 is located in airflow on-off control cavity 103, and valve core assembly 200 includes valve stem 210 and movable magnetic yoke 230 that is sleeved on the periphery of valve stem 210, and movable magnetic yoke 230 is driven by electromagnetic force generated by electromagnetic coil 110, to drive valve core assembly 200 to move along axial direction o to control the on-off between air inlet 101 and air outlet 102 by the part.

[0055] Continuing to refer to Figures 13 to 15 , valve core assembly 200 and valve body assembly 100 jointly define the distal end variable volume cavity 010 and the proximal end variable volume cavity 020 located on the opposite sides of movable magnetic yoke 230 in axial direction o, and the distance between distal end variable volume cavity 010 and air inlet 101 is greater than the distance between proximal end variable volume cavity 020 and air inlet 101 in axial direction o. That is, proximal end variable volume cavity 020 is located between distal end variable volume cavity 010 and air inlet 101.

[0056] As Figure 1 、 Figure 2 、 Figure 6 、 Figures 13 to 15As shown, the spool assembly 200 is provided with a communication passage 201 that communicates the distal variable volume chamber 010 with the proximal variable volume chamber 020.

[0057] As shown, the movable magnetic yoke 230 and the valve body assembly 100 define a damping passage 030 that communicates the distal variable volume chamber 010 with the proximal variable volume chamber 020. Figures 13 to 15

[0058] As shown, the movable magnetic yoke 230 and the valve body assembly 100 define a damping passage 030 that communicates the distal variable volume chamber 010 with the proximal variable volume chamber 020. Figure 6 Figures 13 to 15 As shown, in the utility model, the back pressure assembly 300 is configured to allow gas to flow from one of the distal variable volume chamber 010 and the proximal variable volume chamber 020 to the other via the communication passage 201 (as shown). Figure 15

[0059] As can be understood by those skilled in the art, by providing the damping passage 030 and the communication passage 201 that communicate the distal variable volume chamber 010 with the proximal variable volume chamber 020, and by providing the back pressure assembly 300 that controls the on-off of the communication passage 201, different damping forces are provided for the bidirectional flow of gas between the distal variable volume chamber 010 and the proximal variable volume chamber 020. Therefore, the utility model not only weakens the impact force of the spool assembly 200 on the valve body assembly 100, and reduces the noise when the gas flow on-off valve 001 operates, but also ensures the response rate when the spool assembly 200 moves in one direction.

[0060] Specifically, when the spool assembly 200 moves in one direction of the axial o, the gas first flows from one of the distal variable volume chamber 010 and the proximal variable volume chamber 020 to the other via the damping passage 030. When the moving speed of the spool assembly 200 is large, the space of the variable volume chamber of the one item will be sharply reduced, and the gas pressure will be sharply increased, thereby opening the back pressure assembly 300, so that the gas in the one item also flows via the communication passage 201, thereby providing a smaller damping force for the movement of the spool assembly 200.

[0061] When the spool assembly 200 moves in the other direction of the axial o, the back pressure assembly 300 cannot be opened, and the gas can only flow from the other of the distal variable volume chamber 010 and the proximal variable volume chamber 020 to the one via the damping passage 030, thereby providing a larger damping force for the movement of the spool assembly 200.

[0062] As can be seen from Figure 6 , Figures 13 to 15 , in some embodiments of the utility model, the back pressure assembly 300 only allows gas to flow from the distal variable volume chamber 010 to the proximal variable volume chamber 020 via the communication passage 201.

[0063] As shown, the movable magnetic yoke 230 and the valve body assembly 100 define a damping passage 030 that communicates the distal variable volume chamber 010 with the proximal variable volume chamber 020. Figure 5 ​​​As shown, in some embodiments of this utility model, the valve body assembly 100 may further include 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.

[0064] The fixed magnetic yoke 120 is used to confine the magnetic field generated by the electromagnetic coil 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 electromagnetic coil 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 electromagnetic coil 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 used 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.

[0065] like Figure 5 As shown, with the valve body assembly 100 assembled, the valve seat 131 and valve cover 132 are fixedly mounted to both ends of the housing 140 along the axial direction o. This fixed connection can be an interference fit, threaded connection, welding, or it can be connected by other parts, such as by snap-fit ​​rings. The electromagnetic coil 110 is disposed inside the housing 140, the fixed magnetic yoke 120 is disposed between the valve seat 131 and the electromagnetic coil 110, the power plug 150 is installed at the valve cover 132, and the valve sleeve 160 is disposed inside the electromagnetic coil 110. The dynamic sealing assembly 170 is disposed along its axial direction o between the valve seat 131 and the fixed magnetic yoke 120 and is clamped by the valve seat 131 and the fixed magnetic yoke 120. Sealing rings 180 are respectively provided on the outer sides of the valve seat 131 and the housing 140.

[0066] from Figure 5 As can be seen from the figure, in some embodiments of this utility model, the valve seat 131 and the fixed magnetic yoke 120 together define the air flow cut-off control cavity 103. An air inlet 101 is formed at the axial end of the valve seat 131 away from the fixed magnetic yoke 120, and an air outlet 102 is formed on the circumferential sidewall of the valve seat 131. The valve seat 131 has an inwardly protruding annular structure (not marked in the figure) between the air inlet 101 and the air outlet 102 in the axial direction. A conical ring 1311 is provided on the side of this annular structure closest to the fixed magnetic yoke 120. This conical ring 1311 abuts against the valve core assembly 200, thereby closing the air inlet 101.

[0067] As Figures 13 to 15 shown, in some embodiments of the utility model, airflow on-off valve 001 is configured, the magnetic field produced when electromagnetic coil 110 is electrified acts on movable magnetic yoke 230 and fixed magnetic yoke 120 simultaneously, to make movable magnetic yoke 230 move towards fixed magnetic yoke 120.

[0068] From Figures 13 to 15 it can be seen that the near end variable volume cavity 020 is located on the side of movable magnetic yoke 230 close to fixed magnetic yoke 120, and the far end variable volume cavity 010 is located on the side of movable magnetic yoke 230 away from fixed magnetic yoke 120.

[0069] In addition, in other embodiments of the utility model, at least one of fixed magnetic yoke 120, valve seat 131, valve cover 132, shell 140, power plug 150, valve sleeve 160, dynamic sealing assembly 170 and mounting sealing ring 180 can be omitted by those skilled in the art according to the needs. For example, the setting of valve sleeve 160 can be omitted.

[0070] As Figure 1 , Figure 2 , Figure 6 , Figures 13 to 15 shown, in some embodiments of the utility model, valve core assembly 200 further includes valve plug 220. The valve plug 220 as a part of valve core assembly 200 is used to control the on-off between air inlet 101 and air outlet 102.

[0071] Specifically, the valve plug 220 is movably installed in the airflow on-off control cavity 103 along its axial direction o, and divides the airflow on-off control cavity 103 into a gas guide area 1031 and a pressure equalization area 1032, and the gas guide area 1031 is in communication with the air inlet 101 and the air outlet 102 respectively. Valve core assembly 200 defines a pressure equalization channel 202 that communicates the gas guide area 1031 with the pressure equalization area 1032, so as to introduce the high-pressure gas at the air inlet 101 into the pressure equalization area 1032 when the valve plug 220 closes the air inlet 101, thereby reducing the pressure difference on both ends of the valve plug 220 in the axial direction o.

[0072] In some embodiments of the utility model, 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 fix the valve plug 220 and the valve stem 210 together in any feasible manner such as threaded connection, welding, etc. according to the needs.

[0073] As Figure 2 and Figure 6As shown, in some embodiments of this utility model, the valve plug 220 is provided with a non-circular hole 2201 extending along its axial direction o. The valve stem 210 is inserted into the non-circular hole 2201 and abuts against the peripheral wall of the non-circular hole 2201. The pressure equalization channel 202 is located in the non-circular hole 2201 and is defined by the valve plug 220 and the valve stem 210.

[0074] Alternatively, those skilled in the art may, as needed, configure the pressure equalization channel 202 as a through hole formed on the valve plug 220, and offset the through hole from the valve stem 210 by a certain distance; or configure the pressure equalization channel 202 as a channel formed on the valve stem 210. Furthermore, those skilled in the art may, as needed, configure the non-circular hole 2201 as circular.

[0075] like Figure 6 As shown, in some embodiments of this utility model, an end face sealing ring 221 is provided on the side of the valve plug 220 away from the fixed magnetic yoke 120. The end face sealing ring 221 is adapted to the conical ring 1311 in the valve seat 131. When the end face sealing ring 221 abuts against the conical ring 1311 in the valve seat 131, the end face sealing ring 221 and the valve plug 220 together seal the air inlet 101, thereby blocking the communication between the air inlet 101 and the air outlet 102.

[0076] Continue reading Figure 6 In some embodiments of this utility model, a shock-absorbing member 222 is provided on the side of the valve plug 220 away from the fixed magnetic yoke 120 (the side away from the conical ring 1311). The shock-absorbing member 222 is used to abut against the fixed magnetic yoke 120 to reduce the impact of the valve core assembly 200 on the valve body assembly 100.

[0077] For example, the valve plug 220 is provided with an annular groove (not shown in the figure), and the shock-absorbing member 222 includes an annular portion (not marked in the figure) embedded in the annular groove and a plurality of protrusions (not marked in the figure) provided on the annular portion. The shock-absorbing member 222 is made of rubber, latex or any other feasible elastic material to absorb the impact of the valve core assembly 200 on the valve body assembly 100 when the valve core assembly 200 opens the air inlet 101.

[0078] like Figures 13 to 15 As shown, in some embodiments of this invention, the valve stem 210 passes through the fixed magnetic yoke 120 and is in clearance fit with the fixed magnetic yoke 120, so that gas can flow between the two sides of the axial direction of the fixed magnetic yoke 120. In particular, when the valve core assembly 200 stops moving, it can make the gas pressure in each region of the valve body assembly 100 equal.

[0079] like Figures 13 to 15As shown, in some embodiments of this utility model, the movable magnetic yoke 230 is located inside the valve sleeve 160, and the damping channel 030 is formed between the valve sleeve 160 and the movable magnetic yoke 230.

[0080] like Figure 1 , Figure 2 , Figures 6 to 8 As shown, in some embodiments of this utility model, an axial groove 2301 is provided on the outer peripheral surface of the movable magnetic yoke 230, so that the axial groove 2301 constitutes at least a part of the damping channel 030.

[0081] When the axial groove 2301 forms the entire damping channel 030, the outer peripheral surface of the movable magnetic yoke 230 and the valve sleeve 160 can be in sealed contact through a sealing member (e.g., a sealing ring) or through a transition fit for sliding contact.

[0082] When the axial groove 2301 forms part of the damping channel 030, an annular gap (not marked in the figure) is also formed between the outer peripheral surface of the movable magnetic yoke 230 and the valve body assembly 100 along the radial direction r.

[0083] In addition, in other embodiments of this utility model, those skilled in the art may omit the axial groove 2301 as needed and set the damping channel 030 as an annular gap formed between the movable yoke 230 and the valve body assembly 100.

[0084] like Figure 6 As shown, in some embodiments of this utility model, a communication channel 201 is formed on the valve stem 210.

[0085] like Figure 8 As shown, in some embodiments of this utility model, the movable magnetic yoke 230 is provided with a plug hole 231 for plugging the valve stem 210 and a mounting hole 232 for mounting the back pressure assembly 300. The mounting hole 232 communicates with the plug hole 231 and is located between the plug hole 231 and the remote variable volume cavity 010.

[0086] The valve stem 210 and the movable magnetic yoke 230 can be fixedly connected together by an interference fit, a threaded connection, or welding. Of course, those skilled in the art can also use any other feasible method to fix the valve stem 210 and the movable magnetic yoke 230 together as needed.

[0087] Further, in other embodiments of the present application, a portion of the communication passage 201 can be formed on the valve rod 210 and another portion of the communication passage 201 can be formed on the movable magnetic yoke 230, as required by those skilled in the art.

[0088] As shown in the drawings, Figures 9 to 12 In some embodiments of the present application, the back pressure assembly 300 comprises a fixing member 310 fixedly connected with the movable magnetic yoke 230, a guide rod 320 fixedly connected with the fixing member 310, a shielding member 330 slidably connected with the guide rod 320, and a pre-tightening spring 340 for pressing the shielding member 330 against the fixing member 310. The fixing member 310 is provided with a gas guide hole 311, and the shielding member 330 is used for selectively closing and opening the gas guide hole 311.

[0089] The fixing member 310 and the movable magnetic yoke 230 can be fixedly connected together by any feasible way, such as threaded connection, interference fit, clamping, welding, etc.

[0090] As shown in the drawings, Figures 9 to 12 In some embodiments of the present application, the fixing member 310 is further provided with a fixing hole 312, so that the fixing member 310 is fixedly connected with the guide rod 320 through the fixing hole 312. Further, the fixing member 310 and the guide rod 320 can be fixedly connected together by any feasible way, such as threaded connection, interference fit, welding, etc.

[0091] As shown in the drawings, Figures 13 to 15 In the assembled state, the guide rod 320 extends from the fixing member 310 to the valve rod 210, the shielding member 330 is located on the side of the fixing member 310 close to the valve rod 210, and the pre-tightening spring 340 is located on the side of the shielding member 330 close to the valve rod 210.

[0092] As shown in the drawings, Figure 13 and Figure 14 Under the action of the pre-tightening spring 340, the shielding member 330 is tightly attached to the fixing member 310, and covers and closes the gas guide hole 311 on the fixing member 310.

[0093] Further, in order to ensure the closing effect of the shielding member 330 on the gas guide hole 311, an elastic pad can be arranged on the side of the shielding member 330 facing the fixing member 310 or on the side of the fixing member 310 facing the shielding member 330, so as to ensure that the shielding member 330 and the fixing member 310 can be tightly attached to each other.

[0094] As shown in the drawings, Figure 8As shown, in some embodiments of this utility model, an annular spring stop surface 2321 is provided at one end of the mounting hole 232 near the insertion hole 231. This spring stop surface 2321 is used to stop the end of the preload spring 340 away from the blocking member 330. In addition, a fixing stop surface 2322 for stopping the fixing member 310 is also provided in the mounting hole 232.

[0095] Those skilled in the art will understand that the mounting hole 232 with the above structure can ensure that the compression of the preload spring 340 in different air flow shut-off valves 001 is consistent, thereby ensuring that the back pressure of the back pressure assembly 300 of different air flow shut-off valves 001 is consistent when it is opened, and thus ensuring the consistency of product performance.

[0096] from Figure 8 As can be seen, the mounting hole 232 with the above structure is generally a stepped hole.

[0097] In addition, in other embodiments of this utility model, those skilled in the art may omit the spring stop surface 2321 as needed, and make the end of the preload spring 340 away from the shield 330 abut against the end of the valve stem 210 near the distal variable volume cavity 010.

[0098] like Figure 1 , Figure 2 , Figures 13 to 15 As shown, in some embodiments of this utility model, the pneumatic shut-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 back to a position that opens or closes the air inlet 101, specifically, to drive the valve core assembly 200 back to a position that opens the air inlet 101.

[0099] like Figures 13 to 15 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]. Figure 5 , Figure 6 , Figures 13 to 15 .

[0100] 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, stainless steel, etc., so that the magnetic field generated when the electromagnetic coil 110 is energized acts 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.

[0101] The following reference Figures 13 to 15The working principle of the airflow on-off valve 001 in some embodiments of the utility model will be briefly described.

[0102] As Figure 13 shown, in the state that the electromagnetic coil 110 is powered off, under the action of the reset spring 400, the movable magnetic yoke 230 and the fixed magnetic yoke 120 are away from each other, and thus the valve core assembly 200 opens the air inlet 101, making the air inlet 101 conductive with the air outlet 102. In this state, the gas can flow from the air inlet 101 to the air outlet 102.

[0103] When the electromagnetic coil 110 is powered on, the magnetic field generated by the electromagnetic coil 110 acts on the movable magnetic yoke 230 and the fixed magnetic yoke 120, and makes the movable magnetic yoke 230 and the fixed magnetic yoke 120 generate magnetic force attracting each other. The magnetic force overcomes the elastic force of the reset spring 400, drives the valve core assembly 200 to move from the position shown in Figure 13 to the position shown in Figure 14 .

[0104] In this process, the gas in the proximal variable volume cavity 020 is squeezed and flows to the distal variable volume cavity 010 through the damping channel 030, the flow rate is limited, and the flow rate is low. And thus the moving speed of the valve core assembly 200 is limited, so as to avoid that the valve core assembly 200 moves too fast to bring a larger impact to the valve body assembly 100.

[0105] In addition, in other embodiments of the utility model, in order to avoid that the gas in the proximal variable volume cavity 020 flows to the airflow on-off control cavity 103, a sealing member (such as a sealing ring) can be arranged between the valve rod 210 and the fixed magnetic yoke 120.

[0106] As Figure 14 shown, in the state that the electromagnetic coil 110 is powered on, the valve plug 220 abuts against the conical ring 1311 on the valve seat 131, closing the air inlet 101. The high-pressure gas in the upstream gas path connected with the air inlet 101 will flow to the equal pressure area 1032 (as shown by the dashed line in Figure 14 ), so that the axial o of the valve plug 220 at both ends of the gas guide area 1031 and the equal pressure area 1032 is equal, and thus the pressure difference of the valve plug 220 is small. At the same time, the high-pressure gas in the equal pressure area 1032 will fill the entire valve body assembly 100 through the gap between the valve rod 210 and the fixed magnetic yoke 120 and the damping channel 030, so that the pressure difference of the entire valve core assembly 200 in the axial o is as small as possible.

[0107] When the electromagnetic coil 110 is powered off, 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 13 .

[0108] As Figure 15 shown, in this process, the gas in the distal variable volume chamber 010 is squeezed, and part of the gas flows to the proximal variable volume chamber 020 through the communication channel 201. At the same time, the valve core assembly 200 with a large moving speed causes the space of the distal variable volume chamber 010 to decrease sharply, and the gas pressure increases sharply, thereby opening the back pressure assembly 300, so that part of the gas in the distal variable volume chamber 010 flows to the proximal variable volume chamber 020 through the communication channel 201. In this process, the flow rate of the gas is also limited, and the flow rate is low, and therefore the moving speed of the valve core assembly 200 is limited, avoiding that the valve core assembly 200 moves too fast and brings a larger impact to the valve body assembly 100.

[0109] Compared with the process of closing the gas flow on-off valve 001, the gas can only flow through the damping channel 030 to provide a larger resistance to the valve core assembly 200; compared with the process of opening the gas flow on-off valve 001, the gas flows through the damping channel 030 and the communication channel 201 at the same time, which provides a smaller resistance to the valve core assembly 200, and also ensures the response rate when the gas flow on-off valve 001 is opened.

[0110] Based on the foregoing description, those skilled in the art can understand that the gas flow on-off valve 001 of the utility model not only weakens the impact force of the valve core assembly 200 on the valve body assembly 100 and reduces the noise when the gas flow on-off valve 001 acts, but also ensures the response rate when the gas flow on-off valve 001 is opened.

[0111] 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. Those skilled in the art can split and combine the technical scheme in each of the foregoing embodiments, or make equivalent changes or replacements to the related technical features, without departing from the technical principles of the utility model, and any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the utility model will fall within the protection scope of the utility model.

[0112] Finally, it should be noted that in the utility model, the term "communication" means fluid communication to allow fluid (such as air, liquid) to flow between two things in communication with each other. And the "communication" can be a fluid leak-free flow between two things in communication with each other, or a fluid slightly leaky flow between two things in communication with each other.

Claims

1. An air flow on-off valve, comprising a valve body assembly and a valve core assembly; the valve body assembly is formed with an air inlet for connecting an upstream air passage, an air outlet for connecting a downstream air passage, and an air flow on-off control cavity for communicating the air inlet and the air outlet; the valve body assembly further comprises an electromagnetic coil for generating an electromagnetic force; a part of the valve core assembly is located in the air flow on-off control cavity, the valve core assembly comprises a valve stem and a movable magnetic yoke sleeved on the periphery of the valve stem, the movable magnetic yoke is driven by the electromagnetic force, thereby driving the valve core assembly to move axially to control the on-off between the air inlet and the air outlet through the part of the valve core assembly; the valve core assembly and the valve body assembly jointly define a distal variable volume cavity and a proximal variable volume cavity located on the axially opposite sides of the movable magnetic yoke, the distance between the distal variable volume cavity and the air inlet is greater than the distance between the proximal variable volume cavity and the air inlet in the axial direction; characterized in that, the valve core assembly is provided with a communication channel for communicating the distal variable volume cavity and the proximal variable volume cavity; a damping channel is defined between the movable magnetic yoke and the valve body assembly for communicating the distal variable volume cavity and the proximal variable volume cavity; the air flow on-off valve further comprises a back pressure assembly mounted on the valve core assembly, the back pressure assembly is configured to allow gas to flow from one of the distal variable volume cavity and the proximal variable volume cavity to the other only through the communication channel.

2. The air flow on-off valve according to claim 1, characterized in that, the communication channel is formed on the valve stem, the movable magnetic yoke is provided with a plug hole for plugging the valve stem and a mounting hole for mounting the back pressure assembly, the mounting hole communicates with the plug hole, and the mounting hole is arranged between the plug hole and the distal variable volume cavity.

3. The air flow on-off valve according to claim 2, characterized in that, the back pressure assembly comprises a fixed part fixedly connected with the movable magnetic yoke, a guide rod fixedly connected with the fixed part, a shielding part in sliding connection with the guide rod, and a pre-tightening spring for pressing the shielding part against the fixed part; the fixed part is provided with a gas guide hole, and the shielding part is used for selectively closing and opening the gas guide hole.

4. The air flow on-off valve according to claim 3, characterized in that, the mounting hole is provided with an annular spring stop surface near one end of the plug hole, the spring stop surface is used to stop one end of the pre-tightening spring away from the shielding part; and / or, the mounting hole is further provided with a fixed stop surface for stopping the fixed part.

5. The air flow on-off valve according to claim 4, characterized in that, the mounting hole is arranged as a stepped hole as a whole; and / or, the mounting hole is in threaded connection with the fixed part.

6. The air flow on-off valve according to claim 3, characterized in that, one end of the pre-tightening spring away from the shielding part is in abutment with one end of the valve stem near the distal variable volume cavity.

7. The air flow on-off valve according to any one of claims 1 to 6, characterized in that, The damping passage is an axial groove formed on an outer circumferential surface of the movable magnetic yoke.

8. The flow shut-off valve according to any one of claims 1 to 6, wherein The damping passage is an annular gap formed between the movable magnetic yoke and the valve body assembly.

9. The flow shut-off valve according to claim 8, wherein The valve body assembly further comprises a valve sleeve, The damping passage is formed between the valve sleeve and the movable magnetic yoke.

10. The flow shut-off valve according to any one of claims 1 to 6, wherein The valve core assembly further comprises a valve plug arranged in a flow shut-off control chamber, the valve plug selectively closing and opening the gas inlet port to control the on-off between the gas inlet port and the gas outlet port.

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