Valve device and fluid control assembly

Abstract

A valve device and a fluid control assembly. The valve device comprises a valve core (10) and a valve seat (20); the valve seat (20) is provided with a first flow cavity (201), the valve core (10) being arranged in the first flow cavity (201); the valve core (10) is provided with a first sealing member (31) and a second sealing member (32); a second valve port (2012) and a fourth valve port (2014) are provided in the first flow cavity (201); when in a first sealing position, the first sealing member (31) seals the second valve port (2012); when the valve core (10) moves from the first sealing position to a second sealing position, the second valve port (2012) is always in a closed state; when in the second sealing position, the first sealing member (31) seals the second valve port (2012), and the second sealing member (32) seals the fourth valve port (2014).

Description

Valve devices and fluid control components

[0001] Related applications

[0002] This application claims priority to Chinese patent applications filed on August 1, 2024, with application number 202421855324.9, entitled “Valve and fluid control assembly”, filed on July 26, 2024, with application number 202421803568.2, entitled “Valve and fluid control assembly”, filed on December 29, 2023, with application number 202311869059.X, entitled “Valve device and air-conditioning system and automobile equipped with the valve device”, filed on June 27, 2024, with application number 202410853149.8, entitled “Valve device”, and filed on June 27, 2024, with application number 202421504600.7, entitled “Valve device and air-conditioning system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of valve technology, and in particular to a valve device and a fluid control assembly. Background Art

[0004] Valves are extremely important in fluid transportation and are mainly used to control the flow state of the fluid, such as switching between different flow directions, regulating the flow volume, regulating the fluid pressure, etc.

[0005] In the related art, multi-way valves often require multiple seals to adjust the connectivity between the various valve ports. However, due to manufacturing and assembly errors, multiple seals may not be able to seal multiple valve ports simultaneously, thus affecting the sealing performance of the valve ports and even causing fluid leakage, which in turn impairs the valve's regulating performance. Summary of the Invention

[0006] According to various embodiments of the present application, a valve device is provided.

[0007] A valve device comprising a valve core and a valve seat; the valve seat is configured with a first flow cavity, the valve core is movably disposed in the first flow cavity, a first seal and a second seal are sleeved on the outer circumference of the valve core, the first seal and the second seal are spaced apart along the axial direction of the valve core; a second valve port and a fourth valve port are spaced apart in the first flow cavity along the axial direction of the valve core;

[0008] The valve core has a first sealing position and a second sealing position; when the valve core is in the first sealing position, the first sealing member seals the second valve port; during the process of the valve core moving from the first sealing position to the second sealing position, the second valve port is always in a closed state; when the valve core is in the second sealing position, the first sealing member seals the second valve port, and the second sealing member seals the fourth valve port.

[0009] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered to limit the scope of the disclosed inventions, the presently described embodiments and / or examples, and any of the best modes currently understood for these inventions.

[0011] FIG1 is a cross-sectional view of a valve device provided in one embodiment of the present application.

[0012] FIG2 is a partial cross-sectional view of the valve device provided in FIG1 .

[0013] FIG3 is a partial enlarged view of point A in FIG1 .

[0014] FIG4 is a partial schematic diagram of a valve device provided in one embodiment of the present application.

[0015] FIG5 is a schematic diagram of a valve device provided in an embodiment of the present application.

[0016] FIG6 is a schematic structural diagram of a valve device according to an embodiment of the present application.

[0017] FIG7 is a cross-sectional view of a valve device according to an embodiment of the present application in a fourth sealing position.

[0018] FIG8 is a cross-sectional view of a valve device according to an embodiment of the present application in a second sealing position.

[0019] FIG9 is a schematic diagram of a partial structure of a valve device according to an embodiment of the present application.

[0020] FIG10 is a partial cross-sectional view of a valve device according to an embodiment of the present application.

[0021] FIG11 is a partial cross-sectional view of a valve device according to another embodiment of the present application.

[0022] FIG12 is a partial cross-sectional view of a valve device according to another embodiment of the present application.

[0023] FIG13 is a schematic structural diagram of a valve device according to an embodiment of the present application.

[0024] FIG14 is a cross-sectional view of a valve device according to an embodiment of the present application.

[0025] Reference numerals: 10, valve core; 11, first valve needle; 1101, assembly cavity; 1102, second opening; 1103, third opening; 111, cover plate; 12, second valve needle; 121, first limiting plate; 122, sleeve; 1201, central through hole; 1202, first opening; 101, second flow cavity; 102, second flow port; 1021, second through hole; 1022, second communication port; 1023, third communication port; 103, first sealing groove; 104, second sealing groove; 105, assembly retaining ring; 106, support retaining ring; 1061, boss; 10 7. Assembly groove; 20. Valve seat; 21. First seat body; 22. Second seat body; 23. Retaining ring sleeve; 211. First assembly section; 201. First flow chamber; 2011. First valve port; 2012. Second valve port; 2013. Third valve port; 2014. Fourth valve port; 2015. Valve port portion; 2021. First through hole; 202a. Upper flow port; 202b. Middle flow port; 202c. Lower flow port; 203. Flow groove; 204. Third flow port; 205. Balancing chamber; 206. Fourth sealing groove; 221. First opening; 222. Second opening 223, third opening; 224, fourth opening; 31, first sealing member; 311, sealing protrusion; 310, first sealing ring; 320, second sealing ring; 32, second sealing member; 321, sealing bevel; 322, flat surface; 3201, assembly gap; 323, third sealing ring; 324, fourth sealing ring; 33, first elastic ring; 34, second elastic ring; 35, third sealing member; 41, first pre-tightening structure; 42, second pre-tightening structure; 50, driving mechanism; 51, rotor assembly; 52, driving rod; 53, nut; 54, bearing; 56, stop Movable seat; 57, sliding nut; 58, limiting structure; 521, second limiting plate; 620, main body; 630, sealing head; 640, first part; 650, second part; 140, limiting slot; 142, first slot; 143, second slot; 144, assembly port; 150, fixing slot; 300, sleeve; 510 valve seat body; 511, external interface; 512, seat cavity; 5121, first cavity; 520, valve port; 530, valve core sleeve; 531, flow channel port; 532, through hole; 540, valve seat ring; 560, third sealing ring; 570, fourth sealing ring. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0029] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0031] Referring to Figures 1, 2 and 5, an embodiment of the present application provides a valve device, including a valve core 10 and a valve seat 20, the valve seat 20 is constructed with a first circulation cavity 201, the valve core 10 is movably arranged in the first circulation cavity 201, and the outer peripheral side of the valve core 10 is provided with a first sealing member 31 and a second sealing member 32, and the first sealing member 31 and the second sealing member 32 are arranged at intervals along the axial direction of the valve core. A second valve port 2012 and a fourth valve port 2014 are arranged in the first circulation cavity 201 along the axial direction of the valve core. The first sealing member 31 is used to seal the second valve port 2012, and the second sealing member 32 is used to seal the fourth valve port 2014; the valve core 10 has a first sealing position and a second sealing position; when the valve core 10 is in the first sealing position, the first sealing member 31 seals the second valve port 2012; during the process of the valve core 10 moving from the first sealing position to the second sealing position, the second valve port 2012 is always in a closed state; when the valve core 10 is in the second sealing position, the first sealing member 31 seals the second valve port 2012, and the second sealing member 32 seals the fourth valve port 2014.

[0032] It is understood that when the valve core 10 is in the first sealing position, the first sealing member 31 seals the second valve port 2012, keeping the second valve port 2012 closed. At this point, a certain distance (referred to as the first spacing) exists between the second sealing member 32 and the fourth valve port 2014, keeping the fourth valve port 2014 open. As the valve core 10 moves from the first sealing position toward the second sealing position, the second valve port 2012 remains closed, meaning that the first sealing member 31 is constantly in contact with and sealed against the wall of the first circulation chamber 201. This allows the radial compressive force between the first sealing member 31 and the wall of the first circulation chamber 201 to guide the valve core 10, ensuring that the valve core 10 does not tilt or deflect during movement. The valve core 10 then moves to the second sealing position, whereupon the second sealing member 32 seals the fourth valve port 2014, ensuring that both the second and fourth valve ports 2012, 2014 are closed simultaneously. The distance the valve core 10 moves from the first sealing position to the second sealing position compensates for manufacturing errors between the second valve port 2012 and the fourth valve port 2014. The second valve port 2012 and the fourth valve port 2014 do not need to be always synchronously closed. This arrangement also improves the sealing reliability of the first and second sealing members 31 and 32, reduces fluid leakage, and thus ensures the valve's proper regulation performance.

[0033] In actual use, when the first sealing member 31 is pressed against the second valve port 2012 to close the second valve port 2012, the valve core 10 needs to continue to move in its own axial direction. At this time, the first sealing member 31 slides along the wall of the first circulation cavity 201 with the valve core 10, through a first movement gap, until the second sealing member 32 is pressed against the fourth valve port 2014 to close the fourth valve port 2014. In other words, when the first sealing member 31 is located at the corresponding second valve port 2012, a first distance exists between the second sealing member 32 and the corresponding fourth valve port 2014, and the width of this first distance along the axial direction of the valve core is substantially the same as the first movement gap. This means that when the valve core 10 is required to seal the second valve port 2012 and the fourth valve port 2014 at the same time, the first sealing member 31 must slide along the cavity wall of the first circulation cavity 201 after sealing the second valve port 2012, to compensate for the processing errors of the second valve port 2012 and the fourth valve port 2014, and to guide the movement of the valve core 10 until it moves to the second sealing member 32 to seal the fourth valve port 2014.

[0034] Please continue to refer to Figures 1, 2 and 5. Optionally, the first circulation cavity 201 is further provided with a first valve port 2011 and a third valve port 2013 along the axial direction of the valve core. The first valve port 2011, the second valve port 2012, the third valve port 2013 and the fourth valve port 2014 are all arranged at intervals along the axial direction of the valve core. The first valve port 2011 and the second valve port 2012 are provided corresponding to the first sealing member 31, and the third valve port 2013 and the fourth valve port 2014 are provided corresponding to the second sealing member 32; the valve core 10 has a third sealing position and a fourth sealing position; when the valve core 10 is in the third sealing position, the first sealing member 31 seals the first valve port 2011; during the process of the valve core 10 moving from the third sealing position to the fourth sealing position, the first valve port 2011 is always in a closed state; when the valve core 10 is in the fourth sealing position, the first sealing member 31 seals the first valve port 2011, and the second sealing member 32 seals the third valve port 2013.

[0035] Specifically, when the valve core 10 is in the third sealing position, the first sealing member 31 seals the first valve port 2011, closing the first valve port 2011. At this point, a second distance exists between the second sealing member 32 and the third valve port 2013, and the third valve port 2013 is open. When the valve core 10 moves from the third sealing position toward the fourth sealing position, the first valve port 2011 remains closed, meaning the first sealing member 31 is always in contact with and sealed against the wall of the first circulation chamber 201. In this manner, the radial compressive force between the first sealing member 31 and the wall of the first circulation chamber 201 can be utilized to guide the valve core 10, ensuring that the valve core 10 does not tilt or deflect during movement. This ensures that the valve core 10 does not become skewed or deflected during movement, until the valve core 10 reaches the fourth sealing position, sealing the third valve port 2013 with the second sealing member 32. At this point, the first and third valve ports 2011 and 2013 are simultaneously closed. That is, in order to ensure that the first valve port 2011 and the third valve port 2013 are closed at the same time, the first sealing member 31 must move along the cavity wall of the first circulation cavity 201 by a second moving distance to compensate for the processing errors of the first valve port 2011 and the third valve port 2013, and in this movement process, the valve core 10 is guided, thereby ensuring that the first sealing member 31 and the second sealing member 32 are subjected to uniform force in the circumferential direction relative to the first valve port 2011 and the third valve port 2013 respectively, thereby ensuring good sealing.

[0036] The second moving distance is the same as the second distance.

[0037] In actual use, the first valve port 2011 and the second valve port 2012 are arranged opposite and spaced apart from the first sealing member 31 along the axial direction of the valve core, and the third valve port 2013 and the fourth valve port 2014 are arranged opposite and spaced apart from the second sealing member 32 along the axial direction of the valve core. By axially moving the valve core 10 within the first circulation chamber 201, the sealing of the first sealing member 31 relative to the first valve port 2011 and the second valve port 2012, as well as the sealing of the second sealing member 32 relative to the third valve port 2013 and the fourth valve port 2014, can be adjusted, thereby achieving adjustment of the operating mode of the valve device. Specifically, when the second valve port 2012 and the fourth valve port 2014 are simultaneously closed, the valve device corresponds to the first operating mode, while when the first valve port 2011 and the third valve port 2013 are simultaneously closed, the valve device corresponds to the second operating mode. When the valve device switches from the first working mode to the second working mode, the first sealing member 31 moves with the valve core 10 to seal the first valve port 2011, and then slides with the valve core 10 along the cavity wall of the first circulation cavity 201 for a second moving distance, so that the second sealing member 32 seals the third valve port 2013, thereby achieving switching; and, when the valve device switches from the second working mode to the first working mode, the first sealing member 31 moves with the valve core 10 to seal the second valve port 2012, and then slides with the valve core 10 along the cavity wall of the first circulation cavity 201 for a first moving distance, so that the second sealing member 32 seals the fourth valve port 2014, thereby achieving switching.

[0038] In some embodiments, a third spacing is defined between the first valve port 2011 and the second valve port 2012 along the axial direction of the valve core, and a fourth spacing is defined between the third valve port 2013 and the fourth valve port 2014 along the axial direction of the valve core, wherein the third spacing is smaller than the fourth spacing. This ensures that when the valve device switches operating modes, the first sealing member 31 contacts and seals the corresponding first valve port 2011 or second valve port 2012 by sliding along the first flow chamber 201 through the first or second movement spacing to achieve sealing of the second sealing member 32 relative to the third or fourth valve port 2013 or 2014, thereby satisfying the valve core 10 guidance requirements and ensuring good sealing at each valve port.

[0039] In an alternative embodiment, the dimension of the first seal 31 along the axial direction of the valve core is greater than the dimension of the second seal 32 along the axial direction of the valve core. This arrangement can also ensure that after the first seal 31 seals the corresponding valve port, it needs to slide the first movement distance or the second movement distance before the second seal 32 can seal the corresponding valve port. This can further guide the valve core 10, ensure that the first seal 31 and the second seal 32 are evenly stressed along their own circumferences, and improve sealing performance.

[0040] As shown in Figures 1 and 2, in an optional embodiment, the valve seat 20 is provided with an upper flow port 202a, a middle flow port 202b, a lower flow port 202c, and a third flow port 204, which are in communication with the first flow chamber 201 and are spaced apart along the axial direction of the valve core. The first valve port 2011 and the second valve port 2012 are located on either side of the upper flow port 202a along the axial direction of the valve core, and the third valve port 2013 and the fourth valve port 2014 are located on either side of the lower flow port 202c along the axial direction of the valve core. The second valve port 2012 is located between the upper flow port 202a and the middle flow port 202b, and the fourth valve port 2014 is located between the lower flow port 202c and the third flow port 204. Furthermore, the wall of the first flow chamber 201 is provided with radially outwardly recessed flow grooves 203 at the upper flow port 202a, the middle flow port 202b, and the lower flow port 202c. Then, the two notch edges of the circulation groove 203 corresponding to the upper circulation port 202a along the axial direction of the valve core respectively correspond to the first valve port 2011 and the second valve port 2012, and the two notch edges of the circulation groove 203 corresponding to the lower circulation port 202c along the axial direction of the valve core respectively correspond to the third valve port 2013 and the fourth valve port 2014; and, the setting of the circulation groove 203 can reserve sufficient space to avoid the first seal 31 and the second seal 32 to meet the fluid circulation.

[0041] Illustratively, the first sealing member 31 is movably sealed against the wall of the first circulation chamber 201, and the second sealing member 32 is position-limited and sealed against the fourth valve port 2014. In other words, the first sealing member 31 is pressed against the wall of the first circulation chamber 201 at the upper circulation port 202a, either side of the axial direction of the valve core. This ensures sealing while also facilitating the use of the constraint of the cavity wall to guide the movement of the valve core 10. Simultaneously, the second sealing member 32 is pressed against the edge of the notch at the lower circulation port 202c, either side of the axial direction of the valve core, to achieve sealing.

[0042] In an alternative embodiment, the first sealing member 31 is movably sealed against the wall of the first circulation chamber 201, and the second sealing member 32 is also movably sealed against the wall of the first circulation chamber 201. Specifically, the first sealing member 31 is press-fitted against one of the walls of the first circulation chamber 201 at the upper circulation opening 202a along the axial direction of the valve core, and the second sealing member 32 is press-fitted against one of the walls of the first circulation chamber 201 at the lower circulation opening 202c along the axial direction of the valve core.

[0043] Please continue to refer to Figures 1 and 2. During actual assembly, the valve core 10 is constructed with a first sealing groove 103 and a second sealing groove 104 arranged at intervals along its own axial direction. The first sealing member 31 is sleeved in the first sealing groove 103, and the second sealing member 32 is sleeved in the second sealing groove 104.

[0044] Furthermore, the first sealing member 31 is provided with sealing protrusions 311 on both sides of the valve core's axial direction. Each sealing protrusion 311 projects radially outward from the valve core, pressing against the wall of the first circulation chamber 201 and guiding the movement of the valve needle. The second sealing member 32 is provided radially outward from the first sealing member 31 and is provided with sealing bevels 321 on both sides of the second sealing member 32 along the axial direction of the valve core. Both sealing bevels 321 are arranged to extend radially outward from the same end surface of the valve core and tilt toward each other, gradually decreasing the thickness of the second sealing member 32. The sealing bevels 321 on the second sealing member 32 are designed to press against either edge of the notch on either side of the lower circulation port 202c along the axial direction of the valve core to achieve a seal.

[0045] In some embodiments, the maximum outer diameter of the second sealing member 32 along the radial direction of the valve core 10 is greater than the maximum outer diameter of the first sealing member 31 along the radial direction of the valve core 10 .

[0046] A flat surface 322 is provided between the two sealing inclined surfaces 321 to ensure that the inclination angle of each sealing inclined surface 321 is not too large to affect the structural strength of the edge of the second sealing member 32 .

[0047] Furthermore, the outer circumference of the valve core 10 is provided with two opposing and spaced assembly retaining rings 105 projecting radially outward. A support retaining ring 106 is installed between the two assembly retaining rings 105. The support retaining ring 106 has bosses 1061 projecting radially outward at both ends of the valve core's axial direction. Together with the assembly retaining rings 105 on the same side, these support retaining rings 106 define a first sealing groove 103 and a second sealing groove 104 for mounting the first and second sealing members 31, 32. The bottom of the first sealing groove 103 is provided with an assembly groove 107, within which a first elastic ring 33 is mounted to provide support for the first seal 31. Simultaneously, an assembly gap 3201 is provided between the second seal 32 and the second sealing groove 104. A second elastic ring 34 is mounted within this gap 3201 to provide support for the second seal 32. Furthermore, the first elastic ring 33 cooperates with the first seal 31, and the second elastic ring 34 cooperates with the second seal 32, thereby achieving a double sealing effect.

[0048] The two sealing protrusions 311 on the first sealing member 31 are respectively the first upper sealing portion and the first lower sealing portion, and the two sealing slopes 321 on the second sealing member 32 are respectively the second upper sealing portion and the second lower sealing portion. Furthermore, both the first sealing member 31 and the second sealing member 32 may be sealing rings, such as silicone sealing rings, rubber sealing rings, and the like.

[0049] In an alternative embodiment, a sealing protrusion 311 is provided on the first sealing member 31, and the cross section of the sealing protrusion 311 is hemispherical or elliptical. It is only necessary to ensure that the outer peripheral surface of the sealing protrusion 311 is an arc surface to facilitate movable sealing.

[0050] Referring to Figures 1, 2, and 5, the valve seat 20 is exemplarily configured with a third flow port 204 at the other end of the valve core along the axial direction. The axial direction of the third flow port 204 is angled relative to the axial directions of the upper flow port 202a, the middle flow port 202b, and the lower flow port 202c. The third flow port 204 is coaxially connected to the first flow chamber 201. The lower flow port 202c is located adjacent to the third flow port 204. The valve core 10 can move along its own axial direction to adjust the communication state between the third flow port 204 and the upper flow port 202a and the lower flow port 202c, thereby adjusting the operating mode of the valve device. Specifically, when the valve core 10 is located in the second sealing position, the upper flow port 202a is connected to the third flow port 204, and the middle flow port 202b is connected to the lower flow port 202c. At this time, the valve device is in the first working mode; when the valve core 10 is located in the fourth sealing position, the lower flow port 202c is connected to the third flow port 204, and the upper flow port 202a is connected to the middle flow port 202b. At this time, the valve device is in the second working mode.

[0051] Furthermore, the valve core 10 is configured with a second circulation cavity 101 and a second circulation port 102 connected to the second circulation cavity 101. The second circulation port 102 is located at one axial end of the valve core, for example, at an end away from the third circulation port 204. The second circulation cavity 101 can communicate with the first circulation cavity 201 through the second circulation port 102. When the valve core 10 is in the second sealing position (i.e., the valve device is in the first operating mode), the upper circulation port 202a communicates with the third circulation port 204 through the first circulation cavity 201, the second circulation port 102, and the second circulation cavity 101.

[0052] In some embodiments, as shown in FIG. 7 and FIG. 8 , the valve core 10 is provided with a second circulation cavity 101 , and both ends of the second circulation cavity 101 are provided with a first communication port 1022 and a second communication port 1023 that can respectively communicate with the first circulation cavity 201 .

[0053] In some embodiments, the second communication port 102 includes a first communication port 1022 and a second communication port 1023. When the valve core 10 is in the second sealing position, the upper communication port 202a communicates with the third communication port 204 through the first communication cavity 101, the first communication port 1021, the second communication cavity 102, and the second communication port 1022.

[0054] Specifically, in one embodiment, the first communication port 1022 is provided on a side wall of the valve core 10, and the second communication port 1023 is provided at an end of the valve core 10. Furthermore, the first communication port 1022 is provided at an end of the valve core 10 close to the first valve port 2011, and the second communication port 1023 is provided at an end of the valve core 10 close to the fourth valve port 2014.

[0055] However, the present invention is not limited thereto. In other embodiments, the first communication port 1022 may be provided at an end portion, and the second communication port 1023 may be provided at a side wall of the valve core 10 .

[0056] The first working mode and the second working mode of the valve device are described in detail below.

[0057] In the second operating mode, the first sealing member 31 can seal the first valve port 2011 of the upper flow port 202a, and the second sealing member 32 can seal the third valve port 2013 of the lower flow port 202c. In this state, the upper flow port 202a and the middle flow port 202b communicate through the portion of the first flow cavity 201 located between the first sealing member 31 and the second sealing member 32, forming a first flow channel. Furthermore, the lower flow port 202c and the third flow port 204 communicate through the portion of the first flow cavity 201 located on the side of the second sealing member 32 facing away from the first sealing member 31, forming a second flow channel. The first and second flow channels are disconnected.

[0058] In the first operating mode, the first sealing member 31 can seal the second valve port 2012 of the upper flow port 202a, and the second sealing member 32 can seal the fourth valve port 2014 of the lower flow port 202c. In this state, the upper flow port 202a communicates with the portion of the first flow chamber 201 located on the side of the first sealing member 31 facing away from the second sealing member 32, and further communicates with the second flow chamber 101 via the second flow port 102. The second flow chamber 101 communicates with the third flow port 204, forming a third flow channel. Furthermore, the middle flow port 202b and the lower flow port 202c communicate with each other via the portion of the first flow chamber 201 located on the side of the second sealing member 32 facing away from the first seal 31, forming a fourth flow channel. The third and fourth flow channels are disconnected.

[0059] It is worth noting that the first flow cavity 201 , the second flow port 102 , the second flow cavity 101 and the third flow port 204 on the side of the first sealing member 31 away from the second sealing member 32 are always in a connected state.

[0060] In an alternative embodiment, the second sealing member 32 may be installed at the end of the valve core 10 away from the third circulation port 204, and the first sealing member 31 may be installed at the end of the valve core 10 closer to the third circulation port 204. In this case, the portion of the first circulation cavity 201, the second circulation port 102, the second circulation cavity 101, and the third circulation port 204 on the side of the second sealing member 32 away from the first sealing member 31 are always in communication.

[0061] Referring to Figures 1 and 2 , in an optional embodiment, the valve seat 20 includes a first seat body 21 for supporting the drive mechanism 50, a second seat body 22 that encloses a third flow port 204, and a retaining ring sleeve 23 connected between the first seat body 21 and the second seat body 22. The upper flow port 202a, the middle flow port 202b, and the lower flow port 202c are all spaced apart in the retaining ring sleeve 23. A convex ring is radially protruded inwardly on the inner wall of the retaining ring sleeve 23 between the upper flow port 202a and the middle flow port 202b, and between the middle flow port 202b and the lower flow port 202c to separate them and facilitate pressure sealing with the first sealing member 31 and the second sealing member 32. A first assembly section 211 extends from the portion of the first base body 21 facing the second base body 22. One end of the retaining ring sleeve 23 is sleeved on the outside of the first assembly section 211 and connected to the first base body 21. The radial projection of the protruding ring is substantially the same as the radial thickness of the first assembly section 211 to ensure a press-fit seal with the first sealing member 31. A radially outwardly projecting assembly protrusion is provided on the end of the second base body 22 facing the retaining ring sleeve 23. The assembly protrusion is press-fitted and connected to the retaining ring sleeve 23 to ensure a press-fit seal with the second sealing member 32.

[0062] The upper flow port 202a, the middle flow port 202b, and the lower flow port 202c each comprise a plurality of first through holes 2021 extending through the thickness of the retaining ring sleeve 23, and the plurality of first through holes 2021 are spaced apart along the circumference of the retaining ring sleeve 23. Furthermore, the second flow port 102 comprises a plurality of second through holes 1021 spaced apart along the circumference of the valve core 10, and each second through hole 1021 extends through the thickness of the valve core 10.

[0063] 1 and 3 , the valve device illustratively further includes a first pre-tightening structure 41 connected to the valve core 10. When the valve core 10 moves to the second sealing position, the first pre-tightening structure 41 is used to apply a force to the valve core 10 to compress the fourth valve port 2014. Simultaneously, the valve device further includes a second pre-tightening structure 42 connected to the valve core 10. When the valve core 10 moves to the fourth sealing position, the second pre-tightening structure 42 is used to apply a force to the valve core 10 to compress the third valve port 2013.

[0064] Specifically, since the second sealing member 32 is pressed onto the edge of the notch of the flow groove 203 corresponding to the lower flow port 202c through the sealing bevel 321, the setting of the first pre-tightening structure 41 and the second pre-tightening structure 42 is equivalent to increasing the force of the sealing bevel 321 pressing onto the edge of the notch, thereby further improving the sealing reliability.

[0065] In some specific embodiments, both the first pre-tightening structure 41 and the second pre-tightening structure 42 may be elastic members, such as springs.

[0066] Please continue to refer to Figures 1 and 3. Optionally, the valve device also includes a driving mechanism 50 connected to the valve core 10, which is used to drive the valve core 10 to move along its own axial direction to achieve switching of different working modes of the valve device. Among them, the driving mechanism 50 includes a rotor assembly 51, a driving rod 52 and a nut 53. The nut 53 is installed on the valve seat 20 and is threadedly connected to the driving rod 52. One end of the driving rod 52 is fixedly connected to the rotor assembly 51, and the other end is connected to the valve core 10. During operation, the rotor assembly 51 can drive the driving rod 52 to rotate, so as to promote the driving rod 52 to move along its own axial direction through the threaded cooperation between the driving rod 52 and the nut 53, thereby driving the valve core 10 to move. Among them, the axial direction of the driving rod 52 is the same as the axial direction of the valve core 10, and the driving rod 52 is coaxially assembled with the valve core 10. At the same time, the driving rod 52 can directly adopt a driving rod.

[0067] It should be noted that, in one embodiment, the first sealing member 31 is disposed at an end of the valve core 10 close to the driving mechanism 50 , and the second sealing member 32 is disposed at an end of the valve core 10 away from the driving mechanism 50 .

[0068] But not limited thereto, in another embodiment, the first sealing member 31 is disposed at an end of the valve core 10 away from the driving mechanism 50 , and the second sealing member 32 is disposed at an end of the valve core 10 close to the driving mechanism 50 .

[0069] As shown in FIG4 , in an alternative embodiment, the valve device further includes a stopper seat 56 connected to the valve seat 20 , which is sleeved on the outside of the drive rod 52 . Simultaneously, the valve core 10 is connected to a sliding nut 57 , which is threadedly engaged with the sliding nut 57 at the end of the drive rod 52 away from the rotor assembly 51 . The sliding nut 57 and the stopper seat 56 are engaged via a limiting structure 58 , enabling the drive rod 52 to drive the sliding nut 57 to move the valve core 10 axially relative to the stopper seat 56 along the drive rod 52 , thereby opening and closing the various valve ports. The limiting structure 58 prevents the sliding nut 57 from rotating relative to the stopper seat 56 about the axis of the drive rod 52 .

[0070] As shown in Figures 1 and 3 , the valve core 10 further includes a first valve needle 11 and a second valve needle 12. The end of the first valve needle 11 facing the drive rod 52 is configured with an assembly cavity 1101. One end of the second valve needle 12 is confined within the assembly cavity 1101 and is limitedly connected to the first valve needle 11. The other end of the second valve needle 12 is located outside the assembly cavity 1101 and is connected to the drive rod 52. The second pre-tightening structure 42 is located within the assembly cavity 1101 and is press-fitted between the first valve needle 11 and the second valve needle 12. The first pre-tightening structure 41 is press-fitted between the second valve needle 12 and the drive rod 52.

[0071] Specifically, the side of the assembly cavity 1101 facing the drive rod 52 is open, and a cover plate 111 is provided at the open end. A first stopper 121 is protruding from the end of the second valve needle 12, and the second preload structure 42 is press-fitted between the first stopper 121 and the cover plate 111. Simultaneously, a sleeve 122 is connected between the second valve needle 12 and the drive rod 52. The sleeve 122 is sleeved around the outside of one end of the second valve needle 12 and connected to the drive rod 52. The first stopper 121 is integrally formed with the other end of the second valve needle 12 and can be press-fitted onto the wall of the assembly cavity 1101. A portion of the drive rod 52 extends into the sleeve 122, and a second stopper 521 is protruding radially outward from the drive rod 52. The end of the sleeve 122 facing away from the second valve needle 12 is stopped by the side of the second stopper 521 facing away from the second valve needle 12. The first pre-tightening structure 41 is located inside the sleeve 122 , sleeved on the outside of the driving rod 52 , and press-fitted between the end of the second valve needle 12 and the second limiting plate 521 .

[0072] The cover plate 111 acts as a stop for the second pre-tightening structure 42, thereby ensuring that the axial fit between the first valve needle 11 and the second valve needle 12 is limited. When the drive rod 52 drives the second valve needle 12 toward the fourth valve port 2014, the second pre-tightening structure 42 does not need to function, and the second valve needle 12 directly pushes the first valve needle 11 to move. Conversely, when the drive rod 52 drives the second valve needle 12 toward the fourth valve port 2014, the second valve needle 12 exerts an elastic force on the first valve needle 11 via the second pre-tightening structure 42, thereby pre-tightening the first valve needle 11. The engagement of the sleeve 122 with the drive rod 52 limits the axial engagement between the drive rod 52 and the second valve needle 12. When the drive rod 52 drives the second valve needle 12 away from the fourth valve port 2014, the first preload structure 41 does not need to function; the second valve needle 12 can be moved solely by the engagement of the sleeve 122. Furthermore, the distance between the second valve needle 12 and the drive rod 52 does not increase. Conversely, when the drive rod 52 drives the second valve needle 12 toward the fourth valve port 2014, the limiting sleeve 122 does not function, and the drive rod 52, relying on the first preload structure 41, applies an elastic force to the second valve needle 12, thereby preloading the second valve needle 12.

[0073] In actual use, when the valve core 10 moves to the second sealing position and the rotor assembly 51 continues to rotate in the current rotational direction, the first valve needle 11 and the second valve needle 12 engage, and the first pre-tightening structure 41 is in a compressed state. When both the first valve needle 11 and the second valve needle 12 cannot move further, the drive rod 52 and the second valve needle 12 can flexibly cooperate along the axial direction of the drive rod 52 through the first pre-tightening mechanism. Therefore, the drive rod 52 and the rotor assembly 51 move toward the fourth valve port 2014. During this movement, the drive rod 52 compresses the first pre-tightening structure 41, generating an elastic force on the second valve needle 12. This pushes the first valve needle 11 through the second valve needle 12, further compressing the fourth valve port 2014, thereby pre-tightening the fourth valve port 2014 and improving sealing performance. Simultaneously, when the valve core 10 moves to the fourth sealing position and the rotor assembly 51 continues to rotate in the current rotational direction, the first valve needle 11 and the second valve needle 12 separate, and the second pre-tightening structure 42 is in a compressed state. When the first valve needle 11 cannot move further, since the first valve needle 11 and the second valve needle 12 are axially movable together along the driving rod 52 through the second pre-tightening structure 42, the driving rod 52 drives the second valve needle 12 to disengage from the first valve needle 11 and move in the direction away from the fourth valve port 2014, and during the movement of the driving rod 52, it drives the second valve needle 12 to squeeze the second pre-tightening structure 42, so that the second pre-tightening structure 42 generates an elastic force on the first valve needle 11, and the elastic force can drive the first valve needle 11 to further squeeze the third valve port 2013, thereby satisfying the pre-tightening of the first valve needle 11 on the third valve port 2013 and improving the sealing performance.

[0074] For example, the rotor assembly 51 rotates counterclockwise to drive the valve core 10 to move to the second sealing position, and then rotates clockwise to drive the valve core 10 to move to the fourth sealing position.

[0075] A bearing 54 is provided between the drive rod 52 and the sleeve 122. The inner ring of the bearing 54 is fixedly mounted on the drive rod 52, and the outer ring of the bearing 54 can axially mate with the sleeve 122. The inner wall of the sleeve 122 prevents the outer ring of the bearing 54 from rotating, thereby reducing the friction between the drive rod 52 and the sleeve 122, thereby lowering the rotational resistance of the valve device.

[0076] Continuing with Figures 1 and 3 , illustratively, a third sealing member 35 is disposed between the valve core 10 and the valve seat 20, a balancing chamber 205 is disposed between the end of the valve core 10 facing the drive rod 52 and the valve seat 20, and the second valve needle 12 is configured with a central through-hole 1201 and a first opening 1202 connected to the central through-hole 1201. The central through-hole 1201 is connected to the second flow chamber 101, the first opening 1202 is connected to the assembly chamber 1101, and the assembly chamber 1101 is connected to the balancing chamber 205. This ensures internal balance within the valve device, reduces the force exerted by the fluid on the valve core 10, and facilitates movement of the valve core 10.

[0077] Specifically, the assembly chamber 1101 has two axially opposing walls, one on each side, that are provided with a second opening 1102 and the other on a third opening 1103. The third opening 1103 communicates with the balancing chamber 205, while the second opening 1102 communicates with the first circulation chamber 201 via the second circulation chamber 101 and the second circulation port 102. The second valve needle 12 is inserted through the third opening 1103, and the central through-hole 1201 communicates with the third opening 1103. This ensures that the valve core 10 can move to allow for internal airflow, ensuring internal balancing.

[0078] Meanwhile, the outer peripheral surface of the valve seat 20 is configured with a fourth sealing groove 206 for installing a fourth sealing member, which is pressed between the valve seat 20 and the valve body to achieve a sealing effect.

[0079] In some embodiments, as shown in Figures 6-8, the valve seat 20 is provided with a first opening 221, a second opening 222, a third opening 223, and a fourth opening 224. The first opening 221, the second opening 222, the third opening 223, and the fourth opening 224 are respectively connected to external pipes (not shown). The first opening 221 and the third opening 223 are provided at one end of the valve seat 20, and the second opening 222 and the fourth opening 224 are provided at the other end of the valve seat 20. In addition, the first opening 221, the second opening 222, the third opening 223, and the fourth opening 224 are arranged in sequence along the axial direction of the valve core 10.

[0080] Of course, in other embodiments, the first opening 221 can also be set on the side of the first valve port 2011 away from the second valve port 2012, the second opening 222 is set between the first valve port 2011 and the second valve port 2012, the third opening 223 is set between the second valve port 2012 and the third valve port 2013, and the fourth opening 224 is set between the third valve port 2013 and the fourth valve port 2014.

[0081] In some embodiments, as shown in FIG7 , when the valve core 10 is in the fourth sealing position, the first sealing member 31 seals the first valve port 2011 and opens the second valve port 2012, and the second sealing member 32 seals the third valve port 2013 and opens the fourth valve port 2014. At this point, the first opening 221 communicates with the second opening 222 via the second valve port 2012, and the third opening 223 communicates with the fourth opening 224 via the fourth valve port 2014.

[0082] As shown in FIG8 , when the valve core 10 is in the second sealing position, the first sealing member 31 seals the second valve port 2012 and opens the first valve port 2011, while the second sealing member 32 seals the fourth valve port 2014 and opens the third valve port 2013. At this point, the first opening 221 communicates with the third flow port 204 through the first valve port 2011 and the second flow chamber 101, while the second opening 222 communicates with the third opening 223 through the third valve port 2013.

[0083] The hardness of the second sealing member 32 is greater than that of the first sealing member 31. Due to the greater hardness of the second sealing member 32, it is not easily deformed by the impact of the fluid pressure difference, and there will be no problem of falling off after deformation.

[0084] The following describes the movement of the valve core 10 from the fourth sealing position to the second sealing position.

[0085] When the valve core 10 moves a distance less than the first preset distance from the fourth sealing position to the second sealing position, the third valve port 2013 and the fourth valve port 2014 are both in an open state, the first valve port 2011 is in a sealed state, the second valve port 2012 is in an open state, and the second valve port 2012 can sequentially communicate with the third valve port 2013 and the fourth valve port 2014. The first flow cavity 201 on the side of the first sealing member 31 facing away from the second sealing member 32 is in communication with the first flow cavity 201 on the side of the first sealing member 31 facing the second sealing member 32.

[0086] When the valve core 10 is in the first sealing position, the first valve port 2011 and the third valve port 2013 are both in a sealed state, and when the valve core 10 initially disengages (that is, the moving distance is less than the first preset distance) from the first sealing position, the third valve port 2013 is opened, but the first valve port 2011 is still in a sealed state. At this time, the first flow cavity 201 on the side of the first sealing member 31 away from the second sealing member 32 can be connected to the first flow cavity 201 on the side of the first sealing member 31 toward the second sealing member 32 through the first connecting port 1022, the second connecting port 101, the second connecting port 1023, the fourth valve port 2014, the third valve port 2013 and the second valve port 2012 in sequence. That is, the first flow cavities 201 on both sides of the first valve port 2011 are in a state of mutual communication. Therefore, at this time, the fluid pressure on both sides of the first sealing member 31 is equal. Therefore, within the range of the moving distance, the first sealing member 31 will not be impacted by the pressure difference of the fluid on both sides of the first valve port 2011 , thereby effectively preventing the first sealing member 31 from being deformed.

[0087] Afterwards, the valve core 10 continues to move. When the valve core 10 moves a first predetermined distance from the fourth sealing position to the second sealing position, the first valve port 2011 moves from the sealed state to the just-opened state. The third valve port 2013, the fourth valve port 2014, and the second valve port 2012 are all in the open state. The third valve port 2013, the fourth valve port 2014, and the second valve port 2012 are interconnected, and the fluid pressure on both sides of the first sealing member 31 remains equal. This arrangement prevents the second valve port 2012 from reaching the sealed state while the first sealing member 31 is still in the first valve port 2011. If the second valve port 2012 is already in the sealed state while the first sealing member 31 is still in the first valve port 2011, the fluid pressure on the first sealing member 31 will be unbalanced, and the first sealing member 31 will be easily deformed.

[0088] Afterwards, the valve core 10 continues to move. When the valve core 10 moves from the first preset distance to the second valve port 2012 for closing, the first valve port 2011, the third valve port 2013, and the fourth valve port 2014 are all in an open state, and the first flow cavity 201 on the side of the first sealing member 31 away from the second sealing member 32 can be connected to the first flow cavity 201 on the side of the first sealing member 31 toward the second sealing member 32 through the first valve port 2011, the first connecting port 1022, the second connecting port 101, the second connecting port 1023, the fourth valve port 2014, and the third valve port 2013 in sequence. That is, within the range of this moving distance, the first sealing member 31 will not be affected by the impact of the fluid pressure difference on both sides.

[0089] Afterwards, the valve core 10 continues to move, maintaining the closed state at the second valve port 2012 and moving to the second sealing position. Before the fourth valve port 2014 is closed, the first valve port 2011, the third valve port 2013, and the fourth valve port 2014 are all in an open state. The first flow cavity 201 on the side of the first sealing member 31 facing away from the second sealing member 32 can communicate with the first flow cavity 201 on the side of the first sealing member 31 facing the second sealing member 32 through the first valve port 2011, the first communication port 1022, the second flow cavity 101, the second communication port 1023, the fourth valve port 2014, and the third valve port 2013 in sequence. In other words, the first sealing member 31 is not impacted by the pressure difference of the fluid on both sides, and the first sealing member 31 will not be deformed or dislodged.

[0090] As can be seen, when the valve core 10 moves from the fourth sealing position to the second sealing position, the first sealing member 31 is not impacted by the pressure differential of the fluid across it from the time the third valve port 2013 is opened until the fourth valve port 2014 is closed. Furthermore, during this movement, the valve core 10 increases the sealing stroke of the second valve port 2012, allowing the first sealing member 31 to seal the second valve port 2012 before the second sealing member 32 completes the sealing of the fourth valve port 2014. With the second valve port 2012 sealed, the first sealing member 31 slides a certain distance, achieving simultaneous sealing of the second and fourth valve ports 2012 and 2014.

[0091] The following describes the movement of the valve core 10 from the second sealing position to the fourth sealing position.

[0092] When the valve core 10 moves from the second sealing position to the first sealing position by a distance less than the second predetermined distance, the third valve port 2013 and the fourth valve port 2014 are both in the open state, the second valve port 2012 is in the sealed state, and the first valve port 2011 is in the open state. Furthermore, the first flow cavity 201 on the side of the first sealing member 31 facing away from the second sealing member 32 can communicate with the first flow cavity 201 on the side of the first sealing member 31 facing the second sealing member 32 via the first valve port 2011, the first communication port 1022, the second flow cavity 101, the second communication port 1023, the fourth valve port 2014, and the third valve port 2013 in sequence. In other words, the first flow cavities 201 on both sides of the second valve port 2012 are in communication with each other. Therefore, at this time, the fluid pressure on both sides of the first sealing member 31 is equal. Therefore, within this range of movement, the first sealing member 31 is not impacted by the fluid pressure differential on both sides of the second valve port 2012, thereby effectively preventing deformation of the first sealing member 31.

[0093] Afterwards, the valve core 10 continues to move. When the valve core 10 moves a second predetermined distance from the second sealing position to the fourth sealing position, the second valve port 2012 moves from the sealed state to the just-opened state. The third valve port 2013, the fourth valve port 2014, and the first valve port 2011 are all in the open state. The fluid pressure on both sides of the first sealing member 31 remains equal. This arrangement prevents the first valve port 2011 from reaching the sealed state before the first sealing member 31 has been released from the second valve port 2012. If the first valve port 2011 has already reached the sealed state before the first sealing member 31 has been released from the second valve port 2012, the fluid pressure on the first sealing member 31 will be unbalanced, and the first sealing member 31 will be easily deformed.

[0094] Afterwards, the valve core 10 continues to move. When the valve core 10 moves from the second preset distance to the first valve port 2011 when it is closed, the second valve port 2012, the third valve port 2013, and the fourth valve port 2014 are all in an open state, and the first flow cavity 201 on the side of the first sealing member 31 away from the second sealing member 32 can be connected to the first flow cavity 201 on the side of the first sealing member 31 toward the second sealing member 32 through the first connecting port 1022, the second connecting port 101, the second connecting port 1023, the fourth valve port 2014, the third valve port 2013, and the second valve port 2012 in sequence. That is, within the range of this moving distance, the first sealing member 31 will not be affected by the impact of the fluid pressure difference on both sides.

[0095] Afterwards, the valve core 10 continues to move, maintaining the closed state at the first valve port 2011, to the fourth sealed position. Before the third valve port 2013 is closed, the second valve port 2012, the third valve port 2013, and the fourth valve port 2014 are all in an open state. The first flow cavity 201 on the side of the first sealing member 31 facing away from the second sealing member 32 can communicate with the first flow cavity 201 on the side of the first sealing member 31 facing the second sealing member 32 via the first communication port 1022, the second communication cavity 101, the second communication port 1023, the fourth valve port 2014, the third valve port 2013, and the second valve port 2012, in sequence. In other words, the first sealing member 31 is not impacted by the pressure differential of the fluid on both sides, and the first sealing member 31 will not deform or fall out.

[0096] As can be seen, when the valve core 10 moves from the second sealing position to the fourth sealing position, the first sealing member 31 is not impacted by the pressure differential of the fluid across it from the time the fourth valve port 2014 opens until the third valve port 2013 closes. Furthermore, during this movement, the valve core 10 increases the sealing stroke of the first valve port 2011, allowing the first sealing member 31 to seal the first valve port 2011 before the second sealing member 32 completes the sealing of the third valve port 2013. With the first valve port 2011 sealed, the first sealing member 31 slides a distance, ultimately achieving simultaneous sealing of the first and third valve ports 2011 and 2013.

[0097] Furthermore, by balancing the fluid pressure on both sides of the first sealing member 31 , the resistance to the movement of the valve core 10 can be reduced.

[0098] In one embodiment, the hardness of the second sealing member 32 is greater than the hardness of the first sealing member 31 .

[0099] When the pressure difference between the two sides of the second sealing member 32 is large, such a configuration can reduce the degree of deformation of the second sealing member 32 under the action of the pressure difference, thereby preventing the second sealing member 32 from separating from the valve core 10.

[0100] Specifically, in one embodiment, the second sealing member 32 is a plastic member, such as polytetrafluoroethylene, polyimide, or polyetherketone, which are not listed here one by one.

[0101] At this time, the second sealing member 32 is not easily damaged under the action of the pressure difference, which greatly improves the structural strength of the second sealing member 32 .

[0102] Correspondingly, the first sealing member 31 is a rubber member, such as a nitrile rubber member, a fluororubber member, an acrylic rubber member, a chloroprene rubber member, etc., which are not listed here one by one.

[0103] In one embodiment, as shown in FIG. 7 and FIG. 8 , the first sealing member 31 and the inner wall of the first circulation cavity 201 are movably sealed together along the axial direction of the valve core 10 .

[0104] Specifically, radial pressure is applied to the first sealing member 31 through the inner wall of the first circulation cavity 201 , so that the first sealing member 31 completes sealing of the first valve port 2011 or the second valve port 2012 .

[0105] Since the first sealing member 31 can move axially along the valve core 10 relative to the valve seat 20 , such an arrangement is beneficial for increasing the sealing stroke of the first sealing member 31 .

[0106] Furthermore, in one embodiment, as shown in FIG. 7 to FIG. 9 , the first sealing member 31 includes a first sealing ring 310 and a second sealing ring 320 . The first sealing ring 310 and the second sealing ring 320 may be O-rings or sealing rings of other shapes.

[0107] The first sealing ring 310 and the second sealing ring 320 are spaced apart from each other along the axial direction of the valve core 10 .

[0108] The following describes how the valve core 10 with the first sealing ring 310 and the second sealing ring 320 moves from the second sealing position to the fourth sealing position.

[0109] When the valve core 10 is in the fourth sealing position, the second sealing ring 320 seals the second valve port 2012, the first sealing ring 310 disengages from the first valve port 2011, the second sealing member 32 seals the fourth valve port 2014, and the third valve port 2013 is open. When the valve core 10 moves from the second sealing position to the first sealing position by less than a second predetermined distance, the first valve port 2011, the third valve port 2013, and the fourth valve port 2014 are all open and interconnected. The second sealing ring 320 seals against the inner wall of the first flow chamber 201 to close the second valve port 2012. Furthermore, at this point, the first sealing ring 310 is located between the first valve port 2011 and the second valve port 2012 and does not provide a sealing function. The first valve port 2011 is open, and the fluid pressure on both sides of the first sealing ring 310 is equal. The first flow cavity 201 on the side of the second sealing ring 320 facing away from the second sealing member 32 can be connected to the first flow cavity 201 on the side of the second sealing ring 320 facing the second sealing member 32 via the first valve port 2011, the first communication port 1022, the second flow cavity 101, the second communication port 1023, the fourth valve port 2014, and the third valve port 2013. The fluid pressure on both sides of the second sealing ring 320 is equal. Therefore, within this range of movement, neither the first sealing ring 310 nor the second sealing ring 320 is affected by the fluid pressure difference.

[0110] Afterwards, when the valve core 10 moves a second preset distance from the second sealing position to the fourth sealing position, the second sealing ring 320 disengages from the second valve port 2012, and the first sealing ring 310 does not close the first valve port 2011. The first valve port 2011, the second valve port 2012, the third valve port 2013 and the fourth valve port 2014 are all in an open state and connected to each other, and the fluid pressures on both sides of the first sealing ring 310 and the second sealing ring 320 are equal.

[0111] Subsequently, the first sealing ring 310 closes the first valve port 2011 until the fourth valve port 2014 is closed. The second valve port 2012, the third valve port 2013, and the fourth valve port 2014 are all open and interconnected. The second sealing ring 320 is separated from the second valve port 2012, and the fluid pressure on both sides of the second sealing ring 320 is equal. The first flow cavity 201 on the side of the first sealing ring 310 facing away from the second sealing member 32 can be connected to the first flow cavity 201 on the side of the first sealing ring 310 facing the second sealing member 32 through the first communication port 1022, the second communication cavity 101, the second communication port 1023, the fourth valve port 2014, the third valve port 2013, and the second valve port 2012, respectively. The fluid pressure on both sides of the first sealing ring 310 is equal.

[0112] Finally, the valve core 10 is located at the first sealing position, the first sealing ring 310 seals the first valve port 2011, the second sealing ring 320 is separated from the second valve port 2012, the second sealing member 32 seals the third valve port 2013, and the fourth valve port 2014 is opened.

[0113] Therefore, when the valve core 10 moves from the second sealing position to the fourth sealing position, from the opening of the fourth valve port 2014 to the closing of the third valve port 2013, the first sealing ring 310 and the second sealing ring 320 are never impacted by the fluid pressure difference on both sides thereof.

[0114] The following describes how the valve core 10 with the first sealing ring 310 and the second sealing ring 320 moves from the fourth sealing position to the second sealing position.

[0115] When the valve core 10 is in the fourth sealing position, the first sealing ring 310 seals the first valve port 2011, the second sealing ring 320 disengages from the second valve port 2012, the second sealing portion seals the third valve port 2013, and the fourth valve port 2014 is open. When the distance the valve core 10 moves from the first sealing position to the second sealing position is less than the first predetermined distance, the second valve port 2012, the third valve port 2013, and the fourth valve port 2014 are all open and interconnected. The first sealing ring 310 and the inner wall of the first flow chamber 201 are always in a sealed engagement, thereby closing the first valve port 2011. Furthermore, at this point, the second sealing ring 320 is located between the first valve port 2011 and the second valve port 2012 and does not provide a sealing function. The second valve port 2012 is open, and the fluid pressure on both sides of the second sealing ring 320 is equal. The first flow cavity 201 on the side of the first sealing ring 310 facing away from the second sealing member 32 can communicate with the first flow cavity 201 on the side of the first sealing ring 310 facing the second sealing member 32 via the first communication port 1022, the second flow cavity 101, the second communication port 1023, the fourth valve port 2014, the third valve port 2013, and the second valve port 2012. The fluid pressure on both sides of the first sealing ring 310 is equal. Therefore, within this range of movement, neither the first sealing ring 310 nor the second sealing ring 320 is affected by the fluid pressure difference.

[0116] Afterwards, when the valve core 10 moves a second preset distance from the fourth sealing position to the second sealing position, the first sealing ring 310 disengages from the first valve port 2011, and the second sealing ring 320 does not close the second valve port 212. The first valve port 2011, the second valve port 2012, the third valve port 2013 and the fourth valve port 2014 are all in an open state and connected to each other, and the fluid pressures on both sides of the first sealing ring 310 and the second sealing ring 320 are equal.

[0117] Subsequently, the second sealing ring 320 remains sealed against the second valve port 2012 until the fourth valve port 2014 closes. The first valve port 2011, the third valve port 2013, and the fourth valve port 2014 are all open and interconnected. The first sealing ring 310 is disengaged from the first valve port 2011, and the fluid pressure on both sides of the first sealing ring 310 is equal. The first flow chamber 201 on the side of the second sealing ring 320 facing away from the second sealing element 32 can communicate with the first flow chamber 201 on the side of the second sealing ring 320 facing the second sealing element 32 via the first valve port 2011, the first communication port 1022, the second flow chamber 101, the second communication port 1023, the fourth valve port 2014, and the third valve port 2013, achieving an equal fluid pressure on both sides of the second sealing ring 320.

[0118] Finally, the valve core 10 is located at the second sealing position, the second sealing ring 320 seals the second valve port 2012, the first sealing ring 310 is separated from the first valve port 2011, the second sealing member 32 seals the fourth valve port 2014, and the third valve port 2013 is opened.

[0119] Therefore, when the valve core 10 moves from the fourth sealing position to the second sealing position, from the opening of the third valve port 2013 to the closing of the fourth valve port 2014, the first sealing ring 310 and the second sealing ring 320 are never impacted by the fluid pressure difference on both sides thereof.

[0120] With this arrangement, when there is no pressure difference on both sides of the first sealing member 31 , the first sealing ring 310 will not separate from the valve core 10 , and under the squeezing action of the inner wall of the first circulation cavity 201 , the second sealing ring 320 will not separate from the valve core 10 either.

[0121] When the valve core 10 moves from the fourth sealing position to the second sealing position by a distance less than the first predetermined distance, the first sealing ring 310 and the inner wall of the first circulation chamber 201 seal against each other to close the first valve port 2011. Furthermore, at this time, the second sealing ring 320 is located between the first valve port 2011 and the second valve port 2012 and does not provide a sealing function.

[0122] In another embodiment, the first sealing ring 310 and the second sealing ring 320 may be integrally formed. Specifically, the first sealing ring 310 and the second sealing ring 320 may be two ends of the cylindrical first sealing member 31 .

[0123] In one embodiment, as shown in Figures 7 and 8 , the radial dimension of the second sealing member 32 along the valve core 10 is greater than the radial dimension of the third valve port 2013 along the valve core 10, and the radial dimension of the second sealing member 32 along the valve core 10 is greater than the radial dimension of the fourth valve port 2014 along the valve core 10. The second sealing member 32 and the third valve port 2013 form a limited seal, and the second sealing member 32 and the fourth valve port 2014 form a limited seal.

[0124] In another embodiment, the second sealing member 32 may also be in sealing cooperation with the inner wall of the first circulation cavity 201 along the axial direction of the valve core 10 .

[0125] In one embodiment, a limit groove 140 is provided on the outer peripheral side of the valve core 10 and is arranged around its own axial direction. An assembly port 144 is provided on the end of the limit groove 140 facing away from the valve core 10. The first sealing member 31 is sleeved in the limit groove 140 through the assembly port 144 and fits tightly against the inner wall of the limit groove 140.

[0126] In some embodiments, the radial cross-section of the limiting groove 140 along the axial direction of the valve core 10 is equal to the radial cross-section of the assembly opening 144 along the axial direction of the valve core 10. The radial cross-section of the limiting groove 140 along the axial direction of the valve core 10 is smaller than the radial cross-section of the limiting groove 140 along the axial direction of the valve core 10. The maximum dimension of the first sealing member 31 in the limiting groove 140 along the axial direction of the valve core 10 is smaller than the radial cross-section of the first sealing member 31 along the axial direction of the valve core 10.

[0127] Furthermore, in one embodiment, the radial cross-section width of the limiting groove 140 along the axial direction of the valve core 10 is equal to the width of the assembly opening 144 along the axial direction of the valve core 10. The radial cross-section width of the limiting groove 140 along the axial direction of the valve core 10 is smaller than the radial width of the first sealing member 31 along the axial direction of the valve core 10. The maximum width of the first sealing member 31 within the limiting groove 140 along the axial direction of the valve core 10 is smaller than the radial width of the first sealing member 31 along the axial direction of the valve core 10. This arrangement ensures the securement and stability of the first sealing member 31 and prevents deformation and disengagement of the first sealing member 31 due to fluid pressure differentials.

[0128] It should be noted that the radial cross section of the limiting groove 140 refers to the cross section corresponding to the limiting groove 140 when the limiting groove 140 is cut along the radial direction of the valve core 10 .

[0129] Specifically, the cross section of the limiting slot 140 is rectangular or elliptical.

[0130] Correspondingly, the radial cross section of the first sealing member 31 is rectangular or elliptical.

[0131] This configuration can reduce the difficulty of installing the first sealing member 31 .

[0132] In one embodiment, as shown in Figure 10, there are two second sealing members 32, and each second sealing member 32 is movably sealed with the inner wall of the valve core 10, one second sealing member 32 is sealed with the third valve port 2013, and the other second sealing member 32 is sealed with the fourth valve port 2014; the valve core 10 has a retaining groove 150 for respectively installing the two second sealing members 32.

[0133] In one embodiment, as shown in Figures 11 and 12, the first sealing member 31 includes a main body 620 and a sealing head 630. The first sealing member 31 is clamped in the limiting slot 140 through the main body 620. One end of the sealing head 630 is connected to the main body 620, and the other end extends out of the limiting slot 140 through the assembly port 144 and movably seals with the inner wall of the first circulation cavity 201. The width of the sealing head 630 along the axial direction of the valve core 10 is smaller than the width of the main body 620 along the axial direction of the valve core 10.

[0134] Such a configuration can reduce the contact area between the first sealing member 31 and the inner wall of the first circulation cavity 201 , thereby increasing the contact pressure between the first sealing member 31 and the inner wall of the first circulation cavity 201 , thereby improving the sealing effect of the first sealing member 31 .

[0135] In one embodiment, the limit groove 140 includes a first groove 142 and a second groove 143, the first groove 142 extends radially along the valve core 10, and the assembly port 144 is arranged at the end of the first groove 142 away from the axis of the valve core 10, one end of the second groove 143 is connected to the end of the first groove 142 away from the assembly port 144, and the other end extends axially along the valve core 10; the first sealing member 31 includes a first part 640 and a second part 650, the first part 640 is clamped in the first groove 142, and the second part 650 is clamped in the second groove 143.

[0136] Furthermore, the axial length of the second groove 143 along the valve core 10 is greater than the axial length of the first groove 142 along the valve core 10 ; the axial length of the second portion 650 along the valve core 10 is greater than the axial length of the first groove 142 along the valve core 10 .

[0137] In this way, the radial cross section of the limiting slot 140 formed by the communication between the first slot 142 and the second slot 143 is L-shaped.

[0138] Correspondingly, the radial cross section of the first sealing member 31 is L-shaped.

[0139] Such a configuration further improves the clamping strength between the first sealing member 31 and the limiting slot 140 , making it difficult for the first sealing member 31 to escape from the limiting slot 140 .

[0140] Alternatively, the second groove 143 has an axial length along the valve core 10 that is equal to the axial length of the first groove 142 along the valve core 10, and the inner wall of the second groove 143 has a protrusion along the axial direction of the valve core 10, at least part of which extends deep into the second portion 650. This arrangement ensures the fixed stability of the first sealing member 31 and prevents the first sealing member 31 from deforming and falling off due to the action of the fluid pressure difference.

[0141] In some embodiments, referring to FIG. 13 and FIG. 14 , the valve device further includes a sleeve 300 , which covers the outside of the rotor assembly 51 , a portion of the drive rod 52 , and a portion of the valve core 10 and is welded to the valve seat 20 .

[0142] The valve seat 20 includes a valve seat body 510, a valve core sleeve 530, and a valve seat ring 540. The valve seat body 510 is fixedly mounted on the outer periphery of the valve core sleeve 530, which in turn is fixedly mounted on the outer periphery of the valve seat ring 540. The valve core sleeve 530 defines a first flow chamber 201. The valve core sleeve 530 has at least two valve ports 520. At least a portion of the valve core 10 moves within the first flow chamber 201 to close or open the corresponding valve ports 520. A gap is defined between the valve seat ring 540 and the valve seat body 510, and a portion of the valve core sleeve 530 is located within the gap between the valve seat ring 540 and the valve seat body 510.

[0143] [Corrected 18.03.2025 according to Rule 91] In this arrangement, the valve seat ring 540 is indirectly connected to the valve seat body 510 through the valve core sleeve 530, and the valve core 10 moves along the inner wall of the valve core sleeve 530, that is, part of the valve core sleeve 530 replaces part of the valve seat ring in the prior art. Therefore, the dimensions of the valve seat ring 540 along the valve radial direction and the valve axial direction can be shortened, thereby reducing the volume and cost of the valve seat ring 540.

[0144] [Corrected 18.03.2025 according to Rule 91] In one embodiment, the valve seat 20 further comprises a gasket 550 , which is located in the valve seat body 510 and connected to an end of the valve core sleeve 530 away from the valve seat ring 540 .

[0145] [Corrected 18.03.2025 according to Rule 91] The outer wall of the gasket 550 and the inner wall of the valve core sleeve 530 are interference fit connected; or, the outer wall of the gasket 550 and the inner wall of the valve core sleeve 530 are threaded fit; or, the outer wall of the gasket 550 and the inner wall of the valve core sleeve 530 are welded.

[0146] [Corrected 18.03.2025 according to Rule 91] Further, in one embodiment, the valve seat ring 540 and the sleeve 300 are made of the same material, and the valve seat ring 540 and the valve core sleeve 530 are made of a different material.

[0147] [Corrected 18.03.2025 according to Rule 91] Specifically, in one embodiment, the sleeve 300 is made of stainless steel, and the valve seat ring 540 is welded to the sleeve 300 and is also made of stainless steel. The outer wall of the valve core sleeve 530 and the inner wall of the valve seat body 510 are connected by an interference fit or threaded connection. Therefore, the valve core sleeve 530 does not need to be made of the same stainless steel as the valve seat ring 540. The valve core sleeve 530 and gasket 550 can be made of aluminum alloy, which is more expensive than stainless steel. Therefore, this application can reduce the overall cost of the valve seat assembly.

[0148] [Corrected 18.03.2025 according to Rule 91] In one embodiment, the outer wall of the valve core sleeve 530 and the inner wall of the valve seat ring 540 are connected by interference fit, or the outer wall of the valve core sleeve 530 and the inner wall of the valve seat ring 540 are connected by threads.

[0149] [Corrected on 18.03.2025 according to Rule 91] In one embodiment, as shown in Figure 14, the outer wall of the valve core sleeve 530 and the inner wall of the valve seat body 510 are interference fit, and a third sealing ring 560 is provided between the valve core sleeve 530 and the valve seat body 510 to isolate the connection gap between the valve core sleeve 530 and the valve seat body 510.

[0150] [Corrected 18.03.2025 according to Rule 91] In another embodiment, the outer wall of the valve core sleeve 530 and the inner wall of the valve seat body 510 are threadedly matched. That is, the outer thread of the outer wall of the valve core sleeve 530 and the inner thread of the inner wall of the valve seat body 510 are threadedly matched.

[0151] [Corrected 18.03.2025 according to Rule 91] But not limited to this, in other embodiments, the valve core sleeve 530 and the valve seat body 510 can also be snap-fitted or otherwise limited.

[0152] [Corrected 18.03.2025 according to Rule 91] In one embodiment, as shown in FIG14 , the outer wall of the valve seat ring 540 and the inner wall of the valve core sleeve 530 are interference fit, and a fourth sealing ring 570 is provided between the valve core sleeve 530 and the valve seat ring 540 to isolate the connection gap between the valve core sleeve 530 and the valve seat ring 540. The fourth sealing ring 570 is provided on the valve core sleeve 530, or the fourth sealing ring 570 is provided on the valve seat ring 540.

[0153] [Corrected 18.03.2025 according to Rule 91] In another embodiment, the inner wall of the valve core sleeve 530 and the outer wall of the valve seat ring 540 are threadedly matched. That is, the internal thread of the inner wall of the valve core sleeve 530 and the external thread of the outer wall of the valve seat ring 540 are threadedly matched.

[0154] [Corrected 18.03.2025 according to Rule 91] But not limited to this, in other embodiments, the valve core sleeve 530 and the valve seat ring 540 can also be snap-fitted or otherwise limited.

[0155] [Corrected on 18.03.2025 according to Rule 91] In one embodiment, as shown in Figures 13-14, the valve seat body 510 is provided with a seat cavity 512 and a plurality of external interfaces 511 respectively connected to the seat cavity 512, the valve core sleeve 530 is fixedly connected to the inner wall of the seat cavity 512, the valve core sleeve 530 contains the first flow cavity 201, and the outer peripheral side of the valve core sleeve 530 is provided with a plurality of spaced flow grooves 531, which connect the first flow cavity 201 and the corresponding external interfaces 511.

[0156] [Corrected 18.03.2025 according to Rule 91] In this way, the flow channel groove 531 is arranged on the outer wall of the valve core sleeve 530 instead of on the inner wall of the valve seat body 510, which is conducive to reducing the processing difficulty of the flow channel groove 531 and improving the processing efficiency of the valve device.

[0157] [Corrected 18.03.2025 according to Rule 91] In one embodiment, the seat cavity 512 includes a first cavity 5121 of equal diameter (the diameter is equal at all axial points), the flow channel groove 531 is an annular structure arranged around the valve axis, and multiple flow channel grooves 531 are all located in the first cavity 5121, and there is a flow channel groove 531 between two adjacent third sealing rings 560.

[0158] [Corrected 18.03.2025 according to Rule 91] In one embodiment, the inner side wall of the valve core sleeve 530 is provided with a plurality of through holes 532 distributed along the axial direction of the valve device, the flow channel grooves 531 are connected to the through holes 532 in a one-to-one correspondence, and the through holes 532 are connected to the first flow chamber 201.

[0159] [Corrected on 18.03.2025 according to Rule 91] The present application also provides a fluid control component, which includes a valve seat 20 and a valve core 10, the valve seat 20 includes a valve seat body 510, a valve core sleeve 530 and a valve seat ring 540, the valve seat body 510 is fixedly sleeved on the outer peripheral side of the valve core sleeve 530, the valve core sleeve 530 is fixedly sleeved on the outer peripheral side of the valve seat ring 540, there is a gap between the valve seat ring 540 and the valve seat body 510, part of the valve core sleeve 530 is located in the gap between the valve seat ring 540 and the valve seat body 510, the valve core sleeve 530 has at least two valve ports 520, and the valve core 10 moves along the inner wall of the valve core sleeve 530 to close or open the corresponding valve port 520.

[0160] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0161] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A valve device, characterized in that, The valve device includes a valve core and a valve seat; The valve seat is configured with a first flow cavity, the valve core is movably disposed in the first flow cavity, a first seal and a second seal are sleeved on the outer peripheral side of the valve core, and the first seal and the second seal are arranged at intervals along the axial direction of the valve core; a second valve port and a fourth valve port are arranged at intervals along the axial direction of the valve core in the first flow cavity; The valve core has a first sealing position and a second sealing position; when the valve core is in the first sealing position, the first seal seals the second valve port; during the process of the valve core moving from the first sealing position to the second sealing position, the second valve port is always in a closed state; when the valve core is in the second sealing position, the first seal seals the second valve port, and the second seal seals the fourth valve port.

2. The valve device according to claim 1, wherein, The valve core at the first sealing position drives the first seal to slide along the cavity wall of the first flow cavity to the second sealing position; the first seal is in movable sealing fit with the cavity wall of the first flow cavity.

3. The valve device according to claim 2, wherein, The dimension of the first seal along the axial direction of the valve core is larger than the dimension of the second seal along the axial direction of the valve core; the maximum outer diameter of the second seal along the radial direction of the valve core is larger than the maximum outer diameter of the first seal along the radial direction of the valve core, and the second seal is in limit sealing fit with the fourth valve port.

4. The valve device according to claim 3, wherein, A first valve port and a third valve port are further arranged along the axial direction of the valve core in the first flow cavity, the first valve port, the second valve port, the third valve port and the fourth valve port are all arranged at intervals along the axial direction of the valve core, the first valve port and the second valve port are arranged corresponding to the first seal, and the third valve port and the fourth valve port are arranged corresponding to the second seal; The valve core has a third sealing position and a fourth sealing position; when the valve core is in the third sealing position, the first seal seals the first valve port; during the process of the valve core moving from the third sealing position to the fourth sealing position, the first valve port is always in a closed state; when the valve core is in the fourth sealing position, the first seal seals the first valve port, and the second seal seals the third valve port.

5. The valve device according to claim 4, wherein, Sealing protrusions are arranged on both sides of the first seal along the axial direction of the valve core, and the sealing protrusions are in movable sealing fit with the cavity wall of the first flow cavity; sealing inclined surfaces are arranged on both sides of the second seal along the axial direction of the valve core, and the two sealing inclined surfaces are both inclined outward along the radial direction of the valve core from the end surface on the same side of the second seal, so that the thickness of the second seal gradually decreases; the two sealing inclined surfaces are respectively in limit sealing fit with the third valve port and the fourth valve port.

6. The valve device according to claim 4, wherein, The valve seat is provided with an upper flow port, a middle flow port, a lower flow port and a third flow port that are communicated with the first flow cavity and arranged at intervals along the axial direction of the valve core. The first valve port and the second valve port are located on both sides of the upper flow port along the axial direction of the valve core. The third valve port and the fourth valve port are located on both sides of the lower flow port along the axial direction of the valve core. And the second valve port is located between the upper flow port and the middle flow port, and the fourth valve port is located between the lower flow port and the third flow port; When the valve core is in the second sealing position, the upper flow port is communicated with the third flow port, and the middle flow port is communicated with the lower flow port; when the valve core is in the fourth sealing position, the lower flow port is communicated with the third flow port, and the upper flow port is communicated with the middle flow port.

7. The valve device according to claim 6, wherein, The valve core is configured with a second flow cavity and a second flow port communicated with the second flow cavity. The second flow port is located at one end of the valve core in the axial direction. The second flow cavity is communicated with the first flow cavity through the second flow port, and the second flow cavity is communicated with the third flow port through the second communication port; The second flow port includes a first communication port and a second communication port. When the valve core is in the second sealing position, the upper flow port is communicated with the third flow port through the first flow cavity, the first communication port, the second flow cavity and the second communication port.

8. The valve device according to claim 7, wherein, The valve device further includes a first pre-tightening structure connected to the valve core. When the valve core moves to the second sealing position, the first pre-tightening structure is used to apply a force to the valve core to press the fourth valve port; and / or, The valve device further includes a second pre-tightening structure connected to the valve core. When the valve core moves to the fourth sealing position, the second pre-tightening structure is used to apply a force to the valve core to press the third valve port.

9. The valve device according to claim 8, wherein, The valve device further includes a drive rod connected to the valve core; The valve core includes a first valve needle and a second valve needle. The end of the first valve needle facing the drive rod along the axial direction of the valve core is configured with an assembly cavity. One end of the second valve needle is accommodated in the assembly cavity and connected to the first valve needle, and the other end of the second valve needle is connected to the drive rod. The second pre-tightening structure is located in the assembly cavity and is press-fitted between the second valve needle and the first valve needle, and the first pre-tightening structure is press-fitted between the second valve needle and the drive rod; Both the first seal and the second seal are sleeved on the first valve needle; The drive rod drives the first valve needle to move in the first flow cavity through the second valve needle to block or close the valve port; when the valve core moves to the second sealing position, the first pre-tightening structure is in a compressed state, and when the valve core moves to the fourth sealing position, the second pre-tightening structure is in a compressed state.

10. The valve device according to claim 9, wherein, A third sealing member is provided between the valve core and the valve seat; a balancing chamber is provided between the end of the first valve needle facing the driving rod and the valve seat, and the second valve needle is constructed with a central through hole and a first opening connected to the central through hole, the central through hole is connected to the second circulation chamber, the first opening is connected to the assembly chamber, and the assembly chamber is connected to the balancing chamber.

11. The valve device according to claim 4, wherein, When the valve core is in the fourth sealing position, the first sealing member seals the first valve port and opens the second valve port, and the second sealing member seals the third valve port and opens the fourth valve port; when the valve core is in the second sealing position, the first sealing member seals the second valve port and opens the first valve port, and the second sealing member seals the fourth valve port and opens the third valve port; When the distance that the valve core moves from the second sealing position to the fourth sealing position is less than the second preset distance, the third valve port and the fourth valve port are both in an open state, the second valve port is in a sealed state, the first valve port is in an open state, and the first flow cavity on the side of the first sealing member facing away from the second sealing member is connected to the first flow cavity on the side of the first sealing member facing the second sealing member; The hardness of the second sealing member is greater than the hardness of the first sealing member.

12. The valve device according to claim 11, wherein, When the distance the valve core moves from the second sealing position to the fourth sealing position is a second preset distance, the second valve port moves from a sealed state to a just-opened state, and the third valve port, the fourth valve port, and the first valve port are all in an open state.

13. The valve device according to claim 11, wherein, When the distance that the valve core moves from the fourth sealing position to the second sealing position is less than the first preset distance, the third valve port and the fourth valve port are both in an open state, the first valve port is in a sealed state, the second valve port is in an open state, and the second valve port can connect the third valve port and the fourth valve port in sequence; the first flow cavity on the side of the first seal away from the second seal is connected to the first flow cavity on the side of the first seal toward the second seal.

14. The valve device according to claim 13, wherein, When the distance the valve core moves from the fourth sealing position to the second sealing position is a first preset distance, the first valve port moves from a sealed state to a just-opened state, and the third valve port, the fourth valve port, and the second valve port are all in an open state.

15. The valve device according to claim 11, wherein, The first sealing member comprises a first sealing ring and a second sealing ring, wherein the first sealing ring and the second sealing ring are arranged at intervals along the axial direction of the valve core; When the distance that the valve core moves from the second sealing position to the fourth sealing position is less than the second preset distance, the second sealing ring and the inner wall of the first circulation cavity are sealed and matched to close the second valve port; When the distance that the valve core moves from the fourth sealing position to the second sealing position is less than the first preset distance, the first sealing ring and the inner wall of the first circulation cavity are sealed and cooperate to close the first valve port.

16. The valve device according to claim 15, wherein, When the distance that the valve core moves from the second sealing position to the fourth sealing position is a second preset distance, the first sealing ring and the first valve port are in a non-closed state, the second valve port and the second sealing ring are in a non-closed state, and both the third valve port and the fourth valve port are in an open state; When the distance that the valve core moves from the fourth sealing position to the second sealing position is a first preset distance, the first sealing ring and the first valve port are in a non-closed state, the second valve port and the second sealing ring are in a non-closed state, and both the third valve port and the fourth valve port are in an open state.

17. The valve device according to claim 11, wherein, The dimension of the second seal along the radial direction of the valve core is greater than the dimension of the third valve port along the radial direction of the valve core, and the dimension of the second seal along the radial direction of the valve core is greater than the dimension of the fourth valve port along the radial direction of the valve core; the second seal and the third valve port are in a limiting and sealing fit, and the second seal and the fourth valve port are in a limiting and sealing fit; and / or the number of the second seals is two, each of the second seals is in a movable sealing fit with the inner wall of the valve core, one of the second seals is in a sealing fit with the third valve port, and the other second seal is in a sealing fit with the fourth valve port; the valve core has retention slots for respectively installing the two second seals.

18. The valve device according to claim 11, wherein, A limiting slot is provided on the outer peripheral side of the valve core and is arranged around its own axis, and an assembly port is provided at one end of the limiting slot away from the valve core. The first seal is sleeved in the limiting slot through the assembly port and is in close fit with the inner wall of the limiting slot.

19. The valve device according to claim 18, wherein, The dimension of the radial cross-section of the limiting slot along the axial direction of the valve core is equal to the dimension of the assembly port along the axial direction of the valve core, and the dimension of the radial cross-section of the limiting slot along the axial direction of the valve core is less than its own dimension along the radial direction of the valve core; the maximum dimension of the first seal in the limiting slot along the axial direction of the valve core is less than its own dimension along the radial direction of the valve core.

20. The valve device according to claim 18, wherein, The first seal includes a main body part and a sealing head. The first seal is clamped in the limiting slot through the main body part. One end of the sealing head is connected to the main body part, and the other end extends out of the limiting slot through the assembly port and is in a movable sealing fit with the inner wall of the first flow cavity. The width of the sealing head along the axial direction of the valve core is less than the width of the main body part along the axial direction of the valve core.

21. The valve device according to claim 18, wherein, The limiting slot includes a first slot and a second slot. The first slot extends along the radial direction of the valve core, and the assembly port is arranged at one end of the first slot away from the axis of the valve core. One end of the second slot communicates with the end of the first slot away from the assembly port, and the other end extends along the axial direction of the valve core; the first seal includes a first part and a second part, the first part is clamped in the first slot, and the second part is clamped in the second slot; The axial length of the second slot along the valve core is greater than the axial length of the first slot along the valve core; the axial length of the second part along the valve core is greater than the axial length of the first slot along the valve core.

22. The valve device according to claim 1, wherein, The valve seat includes a valve core sleeve and a valve seat ring. The valve core sleeve is fixedly sleeved on the outer peripheral side of the valve seat ring. The valve core sleeve and the valve seat ring are connected and enclose a first flow cavity. The second valve port and the fourth valve port are arranged on the valve core sleeve. The valve device further includes a sleeve, and the valve seat ring is connected to the sleeve.

23. The valve device according to claim 22, wherein, The valve seat ring and the sleeve are made of the same material, and the valve seat ring and the valve core sleeve are made of different materials.

24. The valve device according to claim 22, wherein, A fourth sealing ring is provided between the valve core sleeve and the valve seat ring. The fourth sealing ring is arranged on the valve core sleeve, and the outer wall of the valve core sleeve and the inner wall of the valve seat ring are connected by interference sealing fit through the fourth sealing ring.

25. The valve device according to claim 22, wherein, The inner side wall of the valve core sleeve is provided with a plurality of through holes spaced along the axial direction of the valve. The outer side wall of the valve core sleeve is provided with a plurality of spaced flow channel grooves. The flow channel grooves are in one-to-one correspondence and communication with the through holes, and the through holes are in communication with the first flow cavity.

26. The valve device according to claim 22, wherein, The valve seat assembly further includes a gasket, and the gasket is connected to one end of the valve core sleeve away from the valve seat ring. The outer wall of the gasket and the inner wall of the valve core sleeve are in interference fit connection; or, the outer wall of the gasket and the inner wall of the valve core sleeve are in threaded fit; or, the outer wall of the gasket and the inner wall of the valve core sleeve are welded.

27. The valve device according to claim 22, wherein, The valve seat includes a valve seat body. The valve seat body is fixedly sleeved on the outer peripheral side of the valve core sleeve. The valve core sleeve is fixedly sleeved on the outer peripheral side of the valve seat ring. There is a distance between the valve seat ring and the valve seat body. Part of the valve core sleeve is located within the distance between the valve seat ring and the valve seat body. The valve core assembly moves along the inner wall of the valve core sleeve to close or open the corresponding valve port.

28. The fluid control assembly according to claim 22, wherein, The valve seat body is provided with a seat cavity and a plurality of outer interfaces respectively communicating with the seat cavity. The valve core sleeve is fixedly connected to the inner wall of the seat cavity. The outer peripheral side of the valve core sleeve is provided with a plurality of spaced flow channel grooves. The flow channel grooves communicate with the corresponding outer interfaces. The seat cavity includes a first cavity. The flow channel grooves are annular structures arranged around the valve axis, and all the plurality of flow channel grooves are located in the first cavity. A third sealing ring is provided between the valve core sleeve and the valve seat body, and there is one flow channel groove between two adjacent third sealing rings.

Images