Air flow on-off valve

Abstract

The utility model belongs to the technical field of gas path control valves, and particularly provides a gas flow on-off valve. The air flow on-off valve aims at solving the problem that when an existing air flow on-off valve acts, noise is large. Therefore, the airflow on-off valve comprises a valve body assembly and a valve element assembly. An air inlet, an air outlet and an air flow on-off control cavity for communicating the air inlet with the air outlet are formed in the valve body assembly. The valve element assembly comprises a valve rod and a movable magnet yoke. The valve element assembly and the valve body assembly jointly define a far-end variable-volume cavity and a near-end variable-volume cavity which are located on the two opposite sides of the movable magnet yoke in the axial direction, and the distance between the far-end variable-volume cavity and the air inlet is larger than the distance between the near-end variable-volume cavity and the air inlet in the axial direction. A damping channel for communicating the far-end variable volume cavity with the near-end variable volume cavity is formed in the valve rod, and the minimum through-flow area of the damping channel is formed to limit the gas flow between the far-end variable volume cavity and the near-end variable volume cavity. 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, 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 by 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 comfort of 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 that is axially movable and installed in the valve body assembly. The valve body assembly forms an air inlet for connecting an upstream air circuit, an air outlet for connecting a downstream air circuit, and an airflow on-off control cavity that connects the air inlet and the air outlet. The valve body assembly also includes an electromagnetic coil for generating electromagnetic force. The valve core assembly includes a valve stem and a movable yoke that is sleeved around the valve stem. The movable 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 control part. 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 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. A damping channel is formed in the valve stem to connect the distal variable volume cavity and the proximal variable volume cavity. The minimum flow area of the damping channel is formed to limit the gas flow between the distal variable volume cavity and the proximal variable volume cavity.

[0006] Optionally, a ratio of the minimum flow area of the damping passage to a first area of a radial cross section of the distal variable volume chamber is selected from any value in a range of 2 ‰ to 500 ‰; and / or, a ratio of the minimum flow area of the damping passage to a second area of a radial cross section of the proximal variable volume chamber is selected from any value in a range of 2 ‰ to 500 ‰.

[0007] Optionally, a ratio of the minimum flow area of the damping passage to a first area of a radial cross section of the distal variable volume chamber is selected from any value in a range of 3 ‰ to 5 ‰; and / or, a ratio of the minimum flow area of the damping passage to a second area of a radial cross section of the proximal variable volume chamber is selected from any value in a range of 3 ‰ to 5 ‰.

[0008] Optionally, the valve body assembly further comprises a fixed magnetic yoke, the airflow on-off valve is configured such that a magnetic field generated when the electromagnetic coil is energized simultaneously acts on the movable magnetic yoke and the fixed magnetic yoke to move the movable magnetic yoke towards the fixed magnetic yoke; the proximal variable volume chamber is located on a side of the movable magnetic yoke close to the fixed magnetic yoke, and the distal variable volume chamber is located on a side of the movable magnetic yoke away from the fixed magnetic yoke.

[0009] Optionally, the valve stem penetrates the proximal variable volume chamber in an axial direction, so that a radial cross section of the proximal variable volume chamber is smaller than a radial cross section of the distal variable volume chamber.

[0010] Optionally, the valve core assembly further comprises a valve plug for controlling on-off of the air inlet and the air outlet.

[0011] Optionally, the valve body assembly further comprises a valve seat, the air inlet is formed at an axial end of the valve seat away from the fixed magnetic yoke, the air outlet is formed on a circumferential side wall of the valve seat, and the airflow on-off control chamber is formed in the valve seat; the valve seat is provided with a conical ring at the air inlet, the conical ring can be sealingly abutted with the valve plug and thus close the air inlet.

[0012] Optionally, the valve body assembly further comprises a valve sleeve sleeved with the fixed magnetic yoke, the movable magnetic yoke is located on an inner side of the valve sleeve and in sliding contact with the valve sleeve.

[0013] Optionally, the damping passage comprises an axial hole section in communication with the distal variable volume chamber and a radial hole section in communication with the proximal variable volume chamber, and the minimum flow area of the damping passage is formed in the radial hole section.

[0014] Optionally, the gas 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 of opening or blocking the gas flow on-off control cavity.

[0015] Based on the foregoing description, those skilled in the art can understand that, in the technical solutions of the foregoing embodiments of the present application, by jointly defining the distal variable volume cavity and the proximal variable volume cavity on the opposite sides of the movable magnetic yoke with the valve core assembly and the valve body assembly, and by arranging the damping channel in the valve rod to communicate the distal variable volume cavity and the proximal variable volume cavity, and by setting the minimum flow area of the damping channel to limit the gas flow between the distal variable volume cavity and the proximal variable volume cavity, the damping channel can hinder the movement of the valve core assembly, so as to weaken the impact force of the valve core assembly on the valve body assembly, and to reduce the noise when the gas flow on-off valve operates.

[0016] Specifically, when the valve core assembly moves, the volumes of the distal variable volume cavity and the proximal variable volume cavity will change, and thus the gas will flow from the distal variable volume cavity to the proximal variable volume cavity, or from the proximal variable volume cavity to the distal variable volume cavity. In this process, the damping channel will limit the flow rate of the gas, and thus damp the flow of the gas. The damping will react on the valve core assembly, and thus hinder the movement of the valve core assembly.

[0017] Further, by setting the damping channel as the axial hole segment communicated with the distal variable volume cavity and the radial hole segment communicated with the proximal variable volume cavity, and by setting the minimum flow area of the damping channel in the radial hole segment, the machining difficulty of the damping channel is reduced, and the production cost is lower.

[0018] Other beneficial effects of the present application will be described in detail in the following with reference to the 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

[0019] 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 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:

[0020] Figure 1 is a structural exploded view (first axonometric perspective) of the gas flow on-off valve in some embodiments of the present application;

[0021] Figure 2 is a structural exploded view (second axonometric perspective) of the gas flow on-off valve in some embodiments of the present application;

[0022] Figure 3 is a perspective view (first axonometric viewing angle) of the airflow on-off valve in some embodiments of the utility model;

[0023] Figure 4 is a perspective view (second axonometric viewing angle) of the airflow on-off valve in some embodiments of the utility model;

[0024] Figure 5 is Figure 4 the sectional view of the valve body assembly along A-A direction in the utility model;

[0025] Figure 6 is Figure 4 the sectional view of the valve core assembly along A-A direction in the utility model;

[0026] Figure 7 is Figure 1 , Figure 2 and Figure 6 the perspective view of the valve rod in the utility model;

[0027] Figure 8 is Figure 4 the sectional view of the airflow on-off valve along A-A direction (open state) in the utility model;

[0028] Figure 9 is Figure 4 the sectional view of the airflow on-off valve along A-A direction (closed state) in the utility model.

[0029] Explanation of reference signs:

[0030] 001, airflow on-off valve;

[0031] 100, valve body assembly; 101, air inlet; 102, air outlet; 103, airflow 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, shell; 150, power plug; 160, valve sleeve; 170, dynamic sealing assembly; 180, mounting sealing ring;

[0032] 200, valve core assembly; 201, pressure equalization channel; 210, valve rod; 211, damping channel; 2111, minimum flow area; 2112, axial hole section; 2113, radial hole section; 220, valve plug; 2201, non-circular hole; 22011, center hole part; 22012, wing hole part; 221, end face sealing ring; 222, shock absorbing member; 230, movable magnetic yoke;

[0033] 010, distal variable volume cavity; 011, first area; 020, proximal variable volume cavity; 021, second area;

[0034] 300, reset spring;

[0035] r, radial; o, axial. DETAILED DESCRIPTION

[0036] It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present application, not all embodiments of the present application, and the part of the embodiments are intended to explain the technical principles of the present application, not to limit the protection scope of the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the protection scope of the present application.

[0037] It should be noted that in the description of the present application, 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 does not 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 present application. In addition, the terms "distal end", "proximal end", "third" are only for description purposes and cannot be understood as indicating or implying relative importance.

[0038] Further, it should be further noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. For example, the terms "mounting", "connecting", "connecting" and "fixing" can be bolted, screwed, welded, inserted, riveted, fused, clamped, etc. Any feasible connection form without special description.

[0039] As shown in FIG. 1, Figures 1 to 9 In some embodiments of the present application, the air flow on-off valve 001 includes a valve body assembly 100 and a valve core assembly 200.

[0040] As shown in FIG. 1, Figures 1 to 5 The valve body assembly 100 is formed with an air inlet 101 for connecting an upstream air path, an air outlet 102 for connecting a downstream air path, and an air flow on-off control cavity 103 for communicating the air inlet 101 and the air outlet 102. The valve body assembly 100 further includes an electromagnetic coil 110 for generating an electromagnetic force.

[0041] As shown in FIG. 1, Figures 1 to 9As shown, a portion of the spool assembly 200 is located within the airflow on-off control chamber 103, the spool assembly 200 includes a valve stem 210 and a movable magnetic yoke 230 which is sleeved on the outer periphery of the valve stem 210, the movable magnetic yoke 230 is driven by electromagnetic force, thereby driving the spool assembly 200 to move axially o to control the on-off of the air inlet 101 and the air outlet 102 through the portion.

[0042] As shown in Figure 8 and Figure 9 , the spool assembly 200 and the valve body assembly 100 jointly define a distal variable volume chamber 010 and a proximal variable volume chamber 020 located on the opposite sides of the movable magnetic yoke 230 in the axial o direction, the distance between the distal variable volume chamber 010 and the air inlet 101 is greater than the distance between the proximal variable volume chamber 020 and the air inlet 101.

[0043] As shown in Figures 6 to 9 , a damping passage 211 which communicates the distal variable volume chamber 010 and the proximal variable volume chamber 020 is formed in the valve stem 210, the minimum flow area 2111 of the damping passage 211 is formed to limit the gas flow between the distal variable volume chamber 010 and the proximal variable volume chamber 020.

[0044] As can be understood by those skilled in the art, by making the spool assembly 200 and the valve body assembly 100 jointly define a distal variable volume chamber 010 and a proximal variable volume chamber 020 located on the opposite sides of the movable magnetic yoke 230 in the axial o direction, and providing a damping passage 211 which communicates the distal variable volume chamber 010 and the proximal variable volume chamber 020 in the valve stem 210, and setting the minimum flow area 2111 of the damping passage 211 to limit the gas flow between the distal variable volume chamber 010 and the proximal variable volume chamber 020, the damping passage 211 can hinder the movement of the spool assembly 200, thereby weakening the impact force of the spool assembly 200 on the valve body assembly 100, and reducing the noise when the airflow on-off valve 001 is actuated.

[0045] Specifically, when the spool assembly 200 moves, the volumes of the distal variable volume chamber 010 and the proximal variable volume chamber 020 will change, and thus the gas will flow from the distal variable volume chamber 010 to the proximal variable volume chamber 020, or from the proximal variable volume chamber 020 to the distal variable volume chamber 010. In this process, the damping passage 211 will limit the flow rate of the gas, and damp the flow of the gas. The damping will react on the spool assembly 200, thereby hindering the movement of the spool assembly 200.

[0046] As shown in Figure 8 and Figure 9As shown, in some embodiments of this invention, the ratio of the minimum flow area 2111 of the damping channel 211 to the first area 011 of the radial r-section of the distal variable volume cavity 010 is selected from any value from 2‰ to 500‰. And / or, the ratio of the minimum flow area 2111 of the damping channel 211 to the second area 021 of the radial r-section of the proximal variable volume cavity 020 is selected from any value from 2‰ to 500‰.

[0047] Furthermore, the ratio of the minimum flow area 2111 of the damping channel 211 to the first area 011 of the radial r-section of the distal variable volume cavity 010 can be selected from any value between 3‰ and 5‰. The ratio of the minimum flow area 2111 of the damping channel 211 to the second area 021 of the radial r-section of the proximal variable volume cavity 020 can be selected from any value between 3‰ and 5‰.

[0048] Specifically, the ratio of the minimum flow area 2111 of the damping channel 211 to the first area 011 of the radial r section of the distal variable volume cavity 010, and the ratio of the minimum flow area 2111 of the damping channel 211 to the second area 021 of the radial r section of the proximal variable volume cavity 020, can each be any feasible value such as 2‰, 2.5‰, 3‰, 3.9‰, 4‰, 5‰, 100‰, 500‰, etc.

[0049] Those skilled in the art will understand that the aforementioned ratios between the minimum flow area 2111 and the first area 011, and between the minimum flow area 2111 and the second area 021, can cause the gas in the distal variable volume cavity 010 or the proximal variable volume cavity 020 to suddenly become congested when flowing towards the damping channel 211, increasing the flow resistance and thus reducing the gas flow rate. During the movement of the valve core assembly 200, one of the distal variable volume cavity 010 and the proximal variable volume cavity 020 is compressed, forcing the gas in that cavity to flow towards the other. With the damping channel 211 restricting the airflow, the gas cannot flow rapidly between the distal variable volume cavity 010 and the proximal variable volume cavity 020, thereby limiting the moving speed of the valve core assembly 200 and preventing the valve core assembly 200 from impacting the valve body assembly 100 due to excessive speed when moving to the end of its stroke.

[0050] like Figure 8 and Figure 9 As shown, in some embodiments of this utility model, the valve stem 210 passes through the proximal variable volume cavity 020 in the axial direction o, so that the radial r section of the proximal variable volume cavity 020 is smaller than the radial r section of the distal variable volume cavity 010.

[0051] The skilled in the art can understand that, by making the radial r section of the distal variable volume cavity 010 different from that of the proximal variable volume cavity 020, the flow of gas is different when the spool assembly 200 moves in different directions, and the damping force of the damping channel 211 on the movement of the spool assembly 200 is also different.

[0052] As shown in the drawings, Figure 5 In some embodiments of the present application, the valve body assembly 100 can 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.

[0053] The fixed magnetic yoke 120 is used to constrain the magnetic field generated by the electromagnetic coil 110 to improve the use efficiency of the magnetic field. The valve seat 131 and the valve cover 132 are respectively fixedly connected with the housing 140 at both ends of the axial o of the housing 140, so as to encapsulate and protect the electromagnetic coil 110, the fixed magnetic yoke 120, the valve sleeve 160, the dynamic sealing assembly 170, etc. The power plug 150 is installed on the valve cover 132 and electrically connected with the electromagnetic coil 110 to provide power for the electromagnetic coil 110. The valve sleeve 160 is used to accommodate a part of the spool assembly 200 and provide guidance for the axial o movement of the spool assembly 200. The dynamic sealing assembly 170 is in sliding seal with the spool assembly 200 to prevent gas from leaking from the high-pressure side to the low-pressure side in the axial o direction. The mounting sealing ring 180 is used to seal the valve body assembly 100 with the mounting object (such as a metal block with a plug hole, a pipe fitting, etc.) to prevent high-pressure gas leakage.

[0054] As shown in the drawings, 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 both ends of the axial o of the housing 140. 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 electromagnetic coil 110 is arranged in the housing 140, the fixed magnetic yoke 120 is arranged 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 arranged on the inner side of the electromagnetic coil 110. The dynamic sealing assembly 170 is arranged between the valve seat 131 and the fixed magnetic yoke 120 along the axial o thereof and is clamped by the valve seat 131 and the fixed magnetic yoke 120. The outer sides of the valve seat 131 and the housing 140 are respectively provided with the mounting sealing ring 180.

[0055] From Figure 5As can be seen from the drawings, in some embodiments of the utility model, the valve seat 131 and the fixed magnetic yoke 120 jointly define the airflow on-off control cavity 103. The air inlet 101 is formed at the axial o end of the valve seat 131 away from the fixed magnetic yoke 120, and the air outlet 102 is formed on the circumferential side wall of the valve seat 131. The valve seat 131 is on the axial o, and an inwardly protruding annular structure (not marked in the drawing) is arranged between the air inlet 101 and the air outlet 102, and 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 close the air inlet 101.

[0056] As shown in Figure 8 and Figure 9 , in some embodiments of the utility model, the airflow on-off valve 001 is configured such that the magnetic field generated when the electromagnetic coil 110 is energized simultaneously acts on the movable magnetic yoke 230 and the fixed magnetic yoke 120, so as to move the movable magnetic yoke 230 towards the fixed magnetic yoke 120.

[0057] As can be seen from the drawings, Figure 8 and Figure 9 , the proximal end variable volume cavity 020 is located on the side of the movable magnetic yoke 230 close to the fixed magnetic yoke 120, and the distal end variable volume cavity 010 is located on the side of the movable magnetic yoke 230 away from the fixed magnetic yoke 120.

[0058] 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 according to the needs. For example, the valve sleeve 160 can be omitted.

[0059] As shown in Figures 6 to 9 , in some embodiments of the utility model, the damping channel 211 includes an axial hole section 2112 in communication with the distal end variable volume cavity 010 and a radial hole section 2113 in communication with the proximal end variable volume cavity 020.

[0060] Further, the minimum flow area 2111 of the damping channel 211 can be formed in the axial hole section 2112 or the radial hole section 2113.

[0061] Those skilled in the art can understand that this form of damping channel 211 is relatively easy to process, and the processing cost is relatively low.

[0062] As shown in Figure 1 , Figure 2 , Figure 8 and Figure 9As shown in some embodiments of the present application, the valve core assembly 200 further comprises a valve plug 220. The valve plug 220 is used to control the on-off of the air inlet 101 and the air outlet 102 as a part of the valve core assembly 200.

[0063] 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 guiding area 1031 and an equal pressure area 1032. The gas guiding area 1031 is in communication with the air inlet 101 and the air outlet 102 respectively. The valve core assembly 200 defines an equal pressure channel 201 for connecting the gas guiding area 1031 and the equal pressure area 1032, so as to introduce the high pressure gas at the air inlet 101 into the equal pressure area 1032 when the valve plug 220 closes the air inlet 101, thereby reducing the pressure difference at both ends of the valve plug 220 in the axial direction o.

[0064] In some embodiments of the present application, the valve plug 220 and the valve rod 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 rod 210 together in any feasible manner such as threaded connection or welding according to the needs.

[0065] As shown in some embodiments of the present application, Figure 2 and Figure 6 the valve plug 220 is provided with a non-circular hole 2201 extending along its axial direction o. The valve rod 210 is inserted into the non-circular hole 2201 and abuts against the peripheral wall of the non-circular hole 2201. The equal pressure channel 201 is located in the non-circular hole 2201 and is defined by the valve plug 220 and the valve rod 210 together.

[0066] Continuing to refer to Figure 2 and Figure 6 in some embodiments of the present application, the non-circular hole 2201 comprises a center hole part 22011 matched with the valve rod 210 and a wing hole part 22012 located radially outside the center hole part 22011. The equal pressure channel 201 is formed in the wing hole part 22012.

[0067] In addition, in other embodiments of the present application, those skilled in the art can also set the non-circular hole 2201 to any other feasible form according to the needs, such as a hole structure with a plum blossom-shaped, triangular, rectangular cross section, etc.

[0068] Alternatively, those skilled in the art can also set the equal pressure channel 201 to a through hole formed on the valve plug 220, and the through hole is offset from the valve rod 210 by a distance; or set the equal pressure channel 201 to a channel formed on the valve rod 210. On this basis, those skilled in the art can also set the non-circular hole 2201 to be circular according to the needs.

[0069] As Figure 8 and Figure 9 As shown in some embodiments of the utility model, the valve stem 210 penetrates through the fixed magnetic yoke 120 and is in clearance fit with the fixed magnetic yoke 120, so that the gas can flow between the two sides of the axial direction o of the fixed magnetic yoke 120. Especially when the valve core assembly 200 stops moving, the air pressure of each area in the valve body assembly 100 can be equalized.

[0070] 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 or welding according to the needs.

[0071] Further, the movable magnetic yoke 230 and the valve sleeve 160 can be in clearance fit, so that the gas can flow between the two sides of the axial direction o of the movable magnetic yoke 230.

[0072] Those skilled in the art can understand that the pressure equalization channel 201, the clearance between the valve stem 210 and the fixed magnetic yoke 120, the clearance between the movable magnetic yoke 230 and the valve sleeve 160, the distal variable volume cavity 010, the proximal variable volume cavity 020 and the damping channel 211 can make the high-pressure gas fill the entire interior of the valve body assembly 100 when the valve plug 220 closes the air inlet 101, so that the pressure difference acting on the valve core assembly 200 in the axial direction o is as small as possible. At the same time, when the valve plug 220 opens the air inlet 101, the high-pressure gas pressure in the valve body assembly 100 will be completely discharged, so that the air pressure in the valve body assembly 100 is consistent with the air pressure of the downstream gas path connected with the air outlet 102.

[0073] Continuing to refer to Figure 6 In some embodiments of the utility model, the side of the valve plug 220 away from the fixed magnetic yoke 120 is provided with an end face sealing ring 221, which is matched with 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 jointly close the air inlet 101.

[0074] Continuing to refer to Figure 6 In some embodiments of the utility model, the side of the valve plug 220 away from the fixed magnetic yoke 120 (away from the conical ring 1311) is provided with a damping member 222, which 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.

[0075] Exemplarily, the valve plug 220 is provided with an annular groove (not shown in the figure), and the damping member 222 includes 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 inlet 101.

[0076] As shown in Figure 1 , Figure 2 , Figure 8 and Figure 9 , in some embodiments of the utility model, the air flow on-off valve 001 can further include a reset spring 300 arranged between the valve body assembly 100 and the valve core assembly 200, and the reset spring 300 is used to drive the valve core assembly 200 to reset to a position where the valve plug 220 opens or closes the air inlet 101.

[0077] As shown in Figure 8 and Figure 9 , the reset spring 300 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 structure that the fixed magnetic yoke 120 and the movable magnetic yoke 230 are in abutment with the reset spring 300 is described in Figures 5 to 9 .

[0078] In some embodiments of the utility model, the fixed magnetic yoke 120 and the 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 the electromagnetic coil 110 is electrified simultaneously acts on the movable magnetic yoke 230 and the fixed magnetic yoke 120, thereby making the movable magnetic yoke 230 move towards the fixed magnetic yoke 120.

[0079] The working principle of the air flow on-off valve 001 in some embodiments of the utility model will be briefly described below with reference to Figure 8 and Figure 9 .

[0080] As shown in Figure 8 , in the state that the electromagnetic coil 110 is de-energized, the movable magnetic yoke 230 and the fixed magnetic yoke 120 are away from each other under the action of the reset spring 300, and thus the valve core assembly 200 opens the air inlet 101, making the air inlet 101 and the air outlet 102 conductive. In this state, the gas can flow from the air inlet 101 to the air outlet 102.

[0081] When the electromagnetic coil 110 is electrified, the magnetic field generated by the electromagnetic coil 110 acts on the movable magnetic yoke 230 and the fixed magnetic yoke 120, and the movable magnetic yoke 230 and the fixed magnetic yoke 120 generate magnetic forces that attract each other. The magnetic force overcomes the elastic force of the reset spring 300, drives the valve core assembly 200 to move from the position shown inFigure 8 to the position shown in Figure 9 During this process, the gas in the proximal variable volume chamber 020 is squeezed and flows to the distal variable volume chamber 010 via the damping channel 211, and thus provides damping to the movement of the valve core assembly 200.

[0082] In addition, in other embodiments of the present application, in order to avoid the gas in the proximal variable volume chamber 020 flowing to the airflow on-off control chamber 103, a sealing member (such as a sealing ring) can be arranged between the valve stem 210 and the fixed magnetic yoke 120.

[0083] As Figure 9 shown, in the state that the electromagnetic coil 110 is energized, 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 to the air inlet 101 will flow to the equal pressure area 1032 (as shown by the dashed line in Figure 9 ), so that the valve plug 220 is equalized in the air pressure at both ends of the axial o in the air guide area 1031 and the equal pressure area 1032, and thus the pressure difference acting on the valve plug 220 is small. At the same time, the high-pressure gas in the equal pressure area 1032 will fill the entire interior of the valve body assembly 100 via the gap between the valve stem 210 and the fixed magnetic yoke 120, and the gap between the movable magnetic yoke 230 and the valve sleeve 160, so that the pressure difference acting on the entire valve core assembly 200 in the axial o is as small as possible.

[0084] When the electromagnetic coil 110 is de-energized, the reset spring 300 drives the valve core assembly 200 to move from the position shown in Figure 9 to the position shown in Figure 8 During this process, the gas in the distal variable volume chamber 010 is squeezed and flows to the proximal variable volume chamber 020 via the damping channel 211, and thus provides damping to the movement of the valve core assembly 200.

[0085] Based on the foregoing description, those skilled in the art can understand that, by means of the present application, the valve core assembly 200 and the valve body assembly 100 jointly define the distal variable volume chamber 010 and the proximal variable volume chamber 020 on the opposite sides of the movable magnetic yoke 230 in the axial o, and the damping channel 211 is arranged in the valve stem 210 to communicate the distal variable volume chamber 010 and the proximal variable volume chamber 020, and the minimum flow area 2111 of the damping channel 211 is arranged to limit the gas flow between the distal variable volume chamber 010 and the proximal variable volume chamber 020, so that the damping channel 211 can hinder the movement of the valve core assembly 200, thereby weakening the impact force of the valve core assembly 200 on the valve body assembly 100, and reducing the noise when the airflow on-off valve 001 is actuated.

[0086] Thus far, the technical solutions of the present application have been described in combination with the foregoing embodiments, but it will be readily understood by those skilled in the art 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 split and combine the technical solutions in the above-described embodiments, or can make equivalent changes or replacements to the 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.

[0087] Finally, it needs to be noted that in the present application, the term "communication" means fluid communication to allow fluid (e.g. air, liquid) to flow between two things in communication with each other. And the "communication" can be fluid leakage-free, flowing between two things in communication with each other, or can be fluid leakage, flowing between two things in communication with each other.

Claims

1. A pneumatic shut-off valve, comprising a valve body assembly and a valve core assembly axially movable within the valve body assembly; The valve body assembly has an air inlet for connecting to an upstream air path, an air outlet for connecting to a downstream air path, and an air flow cut-off control cavity connecting the air inlet and the air outlet; the valve body assembly also includes an electromagnetic coil for generating electromagnetic force. A portion of the valve core assembly is located within the air flow control chamber. The valve core assembly includes a valve stem and a movable magnetic yoke sleeved around the valve stem. The movable magnetic yoke is driven by the electromagnetic force, thereby causing the valve core assembly to move axially to control the flow between the air inlet and the air outlet through the portion of the assembly. Its features are, The valve core assembly and the valve body assembly together define a distal variable volume cavity and a proximal variable volume cavity located on opposite sides of the axial direction of the movable 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. The valve stem has a damping channel that connects the distal variable volume cavity and the proximal variable volume cavity. The minimum flow area of ​​the damping channel is configured to limit the gas flow between the distal variable volume cavity and the proximal variable volume cavity.

2. The pneumatic shut-off valve according to claim 1, characterized in that, The ratio of the minimum flow area of ​​the damping channel to the first area of ​​the radial cross-section of the distal variable volume cavity is selected from any value between 2‰ and 500‰; and / or, The ratio of the minimum flow area of ​​the damping channel to the second area of ​​the radial cross-section of the proximal variable volume cavity is selected from any value between 2‰ and 500‰.

3. The pneumatic shut-off valve according to claim 2, characterized in that, The ratio of the minimum flow area of ​​the damping channel to the first area of ​​the radial cross-section of the distal variable volume cavity is selected from any value between 3‰ and 5‰; and / or, The ratio of the minimum flow area of ​​the damping channel to the second area of ​​the radial cross-section of the proximal variable volume cavity is selected from any value between 3‰ and 5‰.

4. The pneumatic shut-off valve according to claim 1, characterized in that, The valve body assembly also includes a fixed magnetic yoke. The air flow cut-off valve is configured such that the magnetic field generated when the electromagnetic coil is energized acts on both the movable magnetic yoke and the fixed magnetic yoke simultaneously, so that the movable magnetic yoke moves toward the fixed magnetic yoke. The proximal variable volume cavity is located on the side of the movable yoke closer to the fixed yoke. The distal variable volume cavity is located on the side of the movable yoke away from the fixed yoke.

5. The pneumatic shut-off valve according to claim 4, characterized in that, The valve stem extends axially through the proximal variable volume cavity, such that the radial cross-section of the proximal variable volume cavity is smaller than the radial cross-section of the distal variable volume cavity.

6. The pneumatic shut-off valve according to claim 5, characterized in that, The valve core assembly also includes a valve plug, which is used to control the opening and closing of the air inlet and the air outlet.

7. The pneumatic shut-off valve according to claim 6, characterized in that, The valve body assembly also includes a valve seat, the air inlet is formed at the axial end of the valve seat away from the fixed magnetic yoke, the air outlet is formed on the circumferential sidewall of the valve seat, and the air flow cut-off control cavity is formed inside the valve seat; The valve seat is provided with a conical ring at the air inlet, and the conical ring can seal against the valve plug and thus close the air inlet.

8. The pneumatic shut-off valve according to claim 4, characterized in that, The valve body assembly also includes a valve sleeve that is fitted with the fixed magnetic yoke. The movable magnetic yoke is located inside the valve sleeve and slides in contact with the valve sleeve.

9. The pneumatic shut-off valve according to any one of claims 1 to 8, characterized in that, The damping channel includes an axial bore section communicating with the distal variable volume cavity and a radial bore section communicating with the proximal variable volume cavity. The minimum flow area of ​​the damping channel is formed within the radial orifice.

10. The pneumatic shut-off valve according to any one of claims 1 to 8, characterized in that, The pneumatic shut-off valve also includes a reset spring disposed between the valve body assembly and the valve core assembly, the reset spring being used to drive the valve core assembly to reset to the position of opening or blocking the pneumatic shut-off control chamber.

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