Valve device and air conditioning system and automobile equipped with same

Abstract

The invention relates to the technical field of valves, and provides a valve device, an air conditioning system provided with the valve device and an automobile. The valve device comprises a valve element and a valve seat, the valve seat is provided with a first circulation cavity, the valve element is movably arranged in the first circulation cavity, and the peripheral side of the valve element is sleeved with a first sealing piece and a second sealing piece which are arranged in the axial direction of the valve element in a spaced mode; a second valve port and a fourth valve port are formed in the first circulation cavity in the axial direction of the valve element in a spaced mode. The valve element is provided with a first sealing position and a second sealing position. When the valve element is located at the first sealing position, the first sealing piece seals the second valve port. When the valve core moves from the first sealing position to the second sealing position, the second valve port is always in a closed state; when the valve element is located at the second sealing position, the first sealing piece seals the second valve port, and the second sealing piece seals the fourth valve port. Therefore, the sealing reliability can be improved, the problems of fluid leakage and the like are reduced, and the adjusting performance of the valve is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular, to a valve device, an air conditioning system, and an automobile equipped with the valve device. Background Art

[0002] Valves are extremely important in fluid transportation and are mainly used to control the flow state of fluids, such as switching between different flow directions, adjusting the flow rate, adjusting the fluid pressure, etc.

[0003] In the related art, for a multi-way valve, multiple seals are often required to adjust the connection state between each valve port. However, manufacturing errors or assembly errors usually exist during the manufacturing of valve ports. Multiple seals cannot seal multiple valve ports simultaneously, which affects the sealing performance of the valve ports and even causes problems such as fluid leakage, thereby impairing the adjustment performance of the valve itself. Summary of the Invention

[0004] Based on this, it is necessary to provide a valve device to improve the sealing reliability, reduce problems such as fluid leakage, and thus ensure the adjustment performance of the valve itself.

[0005] A 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.

[0006] 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.

[0007] It can be understood that when the valve core is in the first sealing position, the first seal seals the second valve port to keep the second valve port in a closed state. At this time, there is a certain distance between the second seal and the fourth valve port, making the fourth valve port in an open state. When the valve core moves from the first sealing position towards the second sealing position, since the second valve port is always in a closed state, that is, the first seal always contacts and seals with the inner wall of the first flow cavity. In this way, the squeezing force along the radial direction of the valve core between the first seal and the inner wall of the first flow cavity can be used to align the valve core, ensuring that the valve core will not be skewed or offset during the movement; until the valve core moves to the second sealing position, the second seal seals the fourth valve port, thus satisfying the simultaneous closing of the second valve port and the fourth valve port. The distance that the valve core moves from the first sealing position towards the second sealing position compensates for the machining errors of the second valve port and the fourth valve port, and the second valve port and the fourth valve port do not need to be always synchronously in a closed state. At the same time, such a setting improves the sealing reliability of the first seal and the second seal, reduces problems such as fluid leakage, and thus ensures the adjustment performance of the valve itself.

[0008] In some of the embodiments, the valve core at the first sealing position drives the first seal to slide along the inner wall of the first flow cavity by a first movement gap to the second sealing position.

[0009] In some of the embodiments, the first seal is movably and sealingly engaged with the inner wall of the first flow cavity, and the second seal is movably and sealingly engaged with the inner wall of the first flow cavity or is in a limiting and sealing engagement with the fourth valve port.

[0010] In some of the embodiments, the dimension of the first seal along the axial direction of the valve core is greater than the dimension of the second seal along the axial direction of the valve core.

[0011] In some of the embodiments, the second seal protrudes radially outward from the first seal along the valve core, and sealing slopes are provided on both sides of the second seal along the axial direction of the valve core. Both of the two sealing slopes are inclined radially outward and towards each other from the same-side end face of the second seal along the valve core, so that the thickness of the second seal gradually decreases.

[0012] In some of the embodiments, sealing protrusions are provided on both sides of the first seal along the axial direction of the valve core, and each sealing protrusion protrudes radially outward along the valve core.

[0013] In some of the embodiments, a first valve port and a third valve port are further provided in the first flow cavity along the axial direction of the valve core. 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;

[0014] The spool has a third sealing position and a fourth sealing position; when the spool is in the third sealing position, the first seal seals the first valve port; during the process of the spool moving from the third sealing position to the fourth sealing position, the first valve port is always in a closed state; when the spool is in the fourth sealing position, the first seal seals the first valve port and the second seal seals the third valve port.

[0015] In some embodiments, 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 spool. 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 spool. 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 spool. 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;

[0016] When the spool 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 spool 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.

[0017] In some embodiments, the spool is configured with a second flow cavity and a second flow port communicated with the second flow cavity, and the second flow port is located at one end of the spool in the axial direction. The second flow cavity is communicated with the first flow cavity through the second flow port;

[0018] When the spool is in the second sealing position, the upper flow port is communicated with the third flow port through the first flow cavity, the second flow port, and the second flow cavity.

[0019] In some embodiments, the valve device further includes a first pre-tightening structure connected to the spool. When the spool moves to the second sealing position, the first pre-tightening structure is used to apply a force to the spool to press the fourth valve port; and / or, the valve device further includes a second pre-tightening structure connected to the spool. When the spool moves to the fourth sealing position, the second pre-tightening structure is used to apply a force to the spool to press the third valve port.

[0020] In some embodiments, the valve device further includes a drive rod connected to the spool;

[0021] The valve core includes a first valve needle and a second valve needle. One end of the first valve needle along the axial direction of the valve core is constructed 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 located outside the assembly cavity and connected to the drive rod;

[0022] The second preloading structure is located in the assembly cavity and is press-fitted between the second valve needle and the first valve needle, and the first preloading structure is press-fitted between the second valve needle and the drive rod;

[0023] Both the first seal and the second seal are sleeved on the first valve needle;

[0024] The drive rod drives the first valve needle to move in the first flow cavity through the second valve needle to open or close the valve port; when the valve core moves to the second sealing position, the first preloading structure is in a compressed state, and when the valve core moves to the fourth sealing position, the second preloading structure is in a compressed state.

[0025] In some embodiments, a third seal is provided between the valve core and the valve seat; a balance cavity is provided between one end of the first valve needle facing the drive rod and the valve seat, and the second valve needle is configured with a central through hole and a first opening communicating with the central through hole. The central through hole communicates with the second flow cavity, the first opening communicates with the assembly cavity, and the assembly cavity communicates with the balance cavity.

[0026] This application also provides an air conditioning system, including the valve device described above.

[0027] This application also provides a vehicle, including the air conditioning system described above. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a sectional view of the valve device provided by an embodiment of the present application;

[0030] Figure 2 For Figure 1 A partial sectional view of the provided valve device;

[0031] Figure 3 For Figure 1 A partial enlarged view at position A in

[0032] Figure 4 Partial schematic diagram of the valve device provided by an embodiment of the present application;

[0033] Figure 5 Schematic diagram of the valve device provided by an embodiment of the present application.

[0034] 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 disk; 122, sleeve; 1201, central through hole; 1202, first opening; 101, second flow cavity; 102, second flow port; 1021, second through hole; 103, first sealing groove; 104, second sealing groove; 105, assembly retaining ring; 106, support retaining ring; 1061, convex platform; 107, assembly groove; 20, valve seat; 21, first seat body; 22, second seat body; 23, retaining ring sleeve; 211, first assembly section; 201, first flow cavity; 2011, first valve port; 2012, second valve port; 2013, third valve port; 2014, fourth valve port; 2021, first through hole; 202a, upper flow port; 202b, middle flow port; 202c, lower flow port; 203, flow groove; 204, third flow port; 205, balance cavity; 206, fourth sealing groove; 31, first sealing member; 311, sealing protrusion; 32, second sealing member; 321, sealing inclined surface; 322, flat surface; 3201, assembly gap; 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 seat; 57, sliding nut; 58, limiting structure; 521, second limiting disk. Detailed Description of the Invention

[0035] To make the above objects, features, and advantages of the present application more apparent and understandable, the following detailed description of the specific embodiments of the present application will be made with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0036] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the description of this application are only for illustrative purposes and do not represent the only implementation.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise clearly specified and defined, the first feature may be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or diagonally above the second feature, or only indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or diagonally below the second feature, or only indicates that the first feature is at a lower horizontal level than the second feature.

[0039] Unless otherwise defined, all technical and scientific terms used in the description of this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used in the description of this application includes any and all combinations of one or more of the related listed items.

[0040] Please refer to Figure 1 、 Figure 2 and Figure 5As shown, 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 configured with a first flow passage chamber 201. The valve core 10 is movably disposed in the first flow passage chamber 201. A first seal 31 and a second seal 32 are sleeved on the outer peripheral side of the valve core 10, and the first seal 31 and the second seal 32 are arranged at intervals along the axial direction of the valve core. Second valve ports 2012 and fourth valve ports 2014 are arranged at intervals along the axial direction of the valve core in the first flow passage chamber 201. The first seal 31 is used to seal the second valve ports 2012, and the second seal 32 is used to seal the fourth valve ports 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 seal 31 seals the second valve ports 2012. During the process of the valve core 10 moving from the first sealing position to the second sealing position, the second valve ports 2012 are always in a closed state. When the valve core 10 is in the second sealing position, the first seal 31 seals the second valve ports 2012, and the second seal 32 seals the fourth valve ports 2014.

[0041] It can be understood that when the valve core 10 is located at the first sealing position, the first seal 31 seals the second valve ports 2012 to keep the second valve ports 2012 in a closed state. At this time, there is a certain distance (referred to as the first distance) between the second seal 32 and the fourth valve ports 2014, so that the fourth valve ports 2014 are in an open state. When the valve core 10 moves from the first sealing position towards the second sealing position, since the second valve ports 2012 are always in a closed state, that is, the first seal 31 always contacts and seals with the chamber wall of the first flow passage chamber 201. In this way, the squeezing force along the radial direction of the valve core between the first seal 31 and the chamber wall of the first flow passage chamber 201 can be used to guide the valve core 10 correctly, ensuring that the valve core 10 will not be skewed or offset during the movement. Until the valve core 10 moves to the second sealing position, the second seal 32 seals the fourth valve ports 2014, so as to satisfy the simultaneous closing of the second valve ports 2012 and the fourth valve ports 2014. The moving distance of the valve core 10 from the first sealing position towards the second sealing position compensates for the machining errors of the second valve ports 2012 and the fourth valve ports 2014, and the second valve ports 2012 and the fourth valve ports 2014 do not need to be always synchronously in a closed state. At the same time, such a setting improves the sealing reliability of the first seal 31 and the second seal 32, reduces problems such as fluid leakage, and thus ensures the regulating performance of the valve itself.

[0042] During actual use, when the first seal 31 presses on the second valve port 2012 to close the second valve port 2012, the valve core 10 needs to continue to move along its own axis. At this time, the first seal 31 will slide along the wall of the first flow chamber 201 with the valve core 10 for a first movement gap until the second seal 32 presses on the fourth valve port 2014 to close the fourth valve port 2014. That is to say, when the first seal 31 is located at the corresponding second valve port 2012, there is a first distance between the second seal 32 and the corresponding fourth valve port 2014, and the width of the first distance along the axis of the valve core is basically the same as the first movement gap. This results in that when the valve core 10 needs to seal the second valve port 2012 and the fourth valve port 2014 simultaneously, after the first seal 31 seals the second valve port 2012, it is bound to slide along the wall of the first flow chamber 201 to make up for the machining errors between the second valve port 2012 and the fourth valve port 2014, and play a guiding effect on the movement of the valve core 10 until it moves to the position where the second seal 32 seals the fourth valve port 2014.

[0043] Please continue to refer to Figure 1 、 Figure 2 and Figure 5 , optionally, a first valve port 2011 and a third valve port 2013 are further arranged along the axis of the valve core in the first flow chamber 201. 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 axis of the valve core. The first valve port 2011 and the second valve port 2012 are arranged corresponding to the first seal 31, and the third valve port 2013 and the fourth valve port 2014 are arranged corresponding to the second seal 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 seal 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 seal 31 seals the first valve port 2011, and the second seal 32 seals the third valve port 2013.

[0044] Specifically, when the valve core 10 is in the third sealing position, the first seal 31 seals the first valve port 2011 to keep the first valve port 2011 in a closed state. At this time, there is a second spacing between the second seal 32 and the third valve port 2013, and the third valve port 2013 is in an open state. When the valve core 10 moves from the third sealing position towards the fourth sealing position, since the first valve port 2011 is always in a closed state, that is, the first seal 31 always contacts and seals the wall of the first flow chamber 201. Thus, the squeezing force along the radial direction of the valve core between the first seal 31 and the wall of the first flow chamber 201 can also be used to align the valve core 10, ensuring that the valve core 10 will not be skewed or displaced during the movement until the valve core 10 moves to the fourth sealing position to realize the blocking of the third valve port 2013 by the second seal 32. At this time, the first valve port 2011 and the third valve port 2013 are closed simultaneously. That is, when it is necessary to ensure that the first valve port 2011 and the third valve port 2013 are closed simultaneously, the first seal 31 inevitably needs to move a second moving distance along the wall of the first flow chamber 201 to make up for the machining errors of the first valve port 2011 and the third valve port 2013, and during this movement, the valve core 10 is aligned, so as to ensure that the first seal 31 and the second seal 32 are uniformly stressed circumferentially relative to the first valve port 2011 and the third valve port 2013 respectively, thereby ensuring good sealing performance.

[0045] Wherein, the second moving distance is the same as the second spacing.

[0046] In actual use, the first valve port 2011 and the second valve port 2012 are axially opposite and spaced relative to the first seal 31 along the valve core, and the third valve port 2013 and the fourth valve port 2014 are axially opposite and spaced relative to the second seal 32 along the valve core. By moving the valve core 10 axially within the first flow chamber 201, the sealing conditions of the first seal 31 relative to the first valve port 2011 and the second valve port 2012, and the sealing conditions of the second seal 32 relative to the third valve port 2013 and the fourth valve port 2014 can be adjusted, thereby realizing the adjustment of the working mode of the valve device. Among them, when the second valve port 2012 and the fourth valve port 2014 are simultaneously closed, it corresponds to the first working mode of the valve device, and when the first valve port 2011 and the third valve port 2013 are simultaneously closed, it corresponds to the second working mode of the valve device. When the valve device switches from the first working mode to the second working mode, after the first seal 31 moves with the valve core 10 to seal the first valve port 2011, it slides along the wall of the first flow chamber 201 with the valve core 10 for a second moving distance, so that the second seal 32 seals the third valve port 2013 to achieve the switch; and when the valve device switches from the second working mode to the first working mode, after the first seal 31 moves with the valve core 10 to seal the second valve port 2012, it slides along the wall of the first flow chamber 201 with the valve core 10 for a first moving distance, so that the second seal 32 seals the fourth valve port 2014 to achieve the switch.

[0047] In some embodiments, there is a third distance along the axial direction of the valve core between the first valve port 2011 and the second valve port 2012, and there is a fourth distance along the axial direction of the valve core between the third valve port 2013 and the fourth valve port 2014, and the third distance is less than the fourth distance. In this way, when the valve device switches the working mode, when the first seal 31 contacts and seals the corresponding first valve port 2011 or the second valve port 2012, the first seal 31 needs to slide along the first flow chamber 201 for a first moving distance or a second moving distance to achieve the sealing of the second seal 32 relative to the third valve port 2013 or the fourth valve port 2014, meeting the guiding requirement of the valve core 10 and ensuring good sealing at each valve port.

[0048] 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. Such a setting can also ensure that after the first seal 31 seals the corresponding valve port, it needs to slide for a first moving distance or a second moving distance to meet the sealing of the second seal 32 with the corresponding valve port, thereby guiding the valve core 10 and ensuring uniform force on the first seal 31 and the second seal 32 along their circumferences and improving the sealing performance.

[0049] Such as Figure 1 and Figure 2As shown, in an alternative 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 that communicate with the first flow chamber 201 and are arranged at intervals along the axial direction of the valve core. The first valve port 2011 and the second valve port 2012 are located on both sides of the upper flow port 202a along the axial direction of the valve core. The third valve port 2013 and the fourth valve port 2014 are located on both sides of the lower flow port 202c along the axial direction of the valve core. And 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. At the same time, the wall of the first flow chamber 201 is radially recessed with 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 flow groove 203 corresponding to the upper flow port 202a respectively correspond to the first valve port 2011 and the second valve port 2012 along the axial direction of the valve core, and the two notch edges of the flow groove 203 corresponding to the lower flow port 202c respectively correspond to the third valve port 2013 and the fourth valve port 2014 along the axial direction of the valve core. Moreover, the arrangement of the flow grooves 203 can reserve sufficient space to avoid the first seal 31 and the second seal 32 and satisfy fluid flow.

[0050] Exemplarily, the first seal 31 is movably and sealingly engaged with the wall of the first flow chamber 201, and the second seal 32 is sealingly engaged with the fourth valve port 2014 with a limit. That is to say, the first seal 31 is pressed against one of the walls of the first flow chamber 201 on both sides of the upper flow port 202a along the axial direction of the valve core. While satisfying the seal, it is convenient to guide the movement of the valve core 10 by the constraint of the chamber wall. At the same time, the second seal 32 is pressed against one of the notch edges of the lower flow port 202c on both sides of the valve core along the axial direction to achieve sealing.

[0051] In an alternative embodiment, the first seal 31 is movably and sealingly engaged with the wall of the first flow chamber 201, and the second seal 32 is also movably and sealingly engaged with the wall of the first flow chamber 201. That is: the first seal 31 is pressed against one of the walls of the first flow chamber 201 on both sides of the upper flow port 202a along the axial direction of the valve core, and the second seal 32 is pressed against one of the walls of the first flow chamber 201 on both sides of the lower flow port 202c along the axial direction of the valve core.

[0052] Please continue to refer to Figure 1 and Figure 2 , during actual assembly, the valve core 10 is configured with a first seal groove 103 and a second seal groove 104 arranged at intervals along its own axial direction. The first seal 31 is sleeved in the first seal groove 103, and the second seal 32 is sleeved in the second seal groove 104.

[0053] Further, sealing protrusions 311 are provided on both sides of the first seal 31 along the axial direction of the valve core. Each sealing protrusion 311 protrudes radially outward along the valve core to press against the wall of the first flow cavity 201 and can guide the movement of the valve needle. The second seal 32 protrudes radially outward from the first seal 31 along the valve core, and sealing inclined surfaces 321 are provided on both sides of the second seal 32 along the axial direction of the valve core. The two sealing inclined surfaces 321 are both inclined radially outward and towards each other from the end surface on the same side along the valve core, so that the thickness of the second seal 32 gradually decreases. The sealing inclined surfaces 321 on the second seal 32 are used to press against one of the notch edges on both sides of the lower flow port 202c along the axial direction of the valve core to achieve sealing.

[0054] Wherein, a flat straight surface 322 is provided between the two sealing inclined surfaces 321 to ensure that the inclination angles of the respective sealing inclined surfaces 321 are not too large to affect the structural strength at the edge of the second seal 32.

[0055] Furthermore, two relatively spaced assembly retaining rings 105 protrude radially outward from the outer peripheral surface of the valve core 10, and a support retaining ring 106 is installed between the two assembly retaining rings 105. The support retaining ring 106 protrudes radially outward at both ends along the axial direction of the valve core to form protrusions 1061, so as to jointly define a first seal groove 103 and a second seal groove 104 with the assembly retaining ring 105 on the same side for installing the first seal 31 and the second seal 32. An assembly groove 107 is recessed at the bottom of the first seal groove 103, and a first elastic ring 33 is installed in the assembly groove 107 to provide a supporting force for the first seal 31. At the same time, an assembly gap 3201 is left between the second seal 32 and the second seal groove 104, and a second elastic ring 34 is installed at the assembly gap 3201 to provide a supporting force for the second seal 32. In addition, 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.

[0056] Wherein, the two sealing protrusions 311 on the first seal 31 are respectively a first upper sealing portion and a first lower sealing portion, and the two sealing inclined surfaces 321 on the second seal 32 are respectively a second upper sealing portion and a second lower sealing portion. At the same time, both the first seal 31 and the second seal 32 can be sealing rings, such as silicone sealing rings, rubber sealing rings, etc.

[0057] In an alternative embodiment, a sealing protrusion 311 protrudes from the first seal 31, and the cross-section of the sealing protrusion 311 is hemispherical or elliptical, as long as it ensures that the outer peripheral surface of the sealing protrusion 311 is an arc surface for easy movement of the seal.

[0058] Please refer to Figure 1 、 Figure 2 and Figure 5, illustratively, the other end of the valve seat 20 along the axial direction of the valve core is configured with a third flow port 204, the axial direction of the third flow port 204 is arranged at an angle with the axial direction of the upper flow port 202a, the axial direction of the middle flow port 202b, and the axial direction of the lower flow port 202c, and the third flow port 204 is connected to the first flow cavity 201 and is arranged coaxially. Among them, the lower flow port 202c is arranged close to the third flow port 204. The valve core 10 can move along its own axial direction to adjust the communication state of the third flow port 204 with the upper flow port 202a and the lower flow port 202c, so as to adjust the working 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, and 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, and the valve device is in the second working mode.

[0059] Further, 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, and the second circulation port 102 is located at one end of the valve core axial direction, for example, at an end away from the third circulation port 204. The second circulation cavity 101 can be connected to the first circulation cavity 201 through the second circulation port 102. When the valve core 10 is located at the second sealing position (that is, the valve device is in the first working mode), the upper circulation port 202a is connected to the third circulation port 204 through the first circulation cavity 201, the second circulation port 102, and the second circulation cavity 101.

[0060] The first working mode and the second working mode of the valve device are described in detail below.

[0061] In the second working 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. At this time, the upper flow port 202a and the middle flow port 202b are connected through a portion of the first flow cavity 201 located between the first sealing member 31 and the second sealing member 32 to form a first flow channel; and the lower flow port 202c and the third flow port 204 are connected through a portion of the first flow cavity 201 located on the side of the second sealing member 32 away from the first sealing member 31 to form a second flow channel. The first flow channel and the second flow channel are not connected.

[0062] In the first working 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. At this time, the upper flow port 202a is connected to the portion of the first flow cavity 201 located on the side of the first sealing member 31 away from the second sealing member 32, and is connected to the second flow cavity 101 through the second flow port 102, and the second flow cavity 101 is connected to the third flow port 204 to form a third flow channel; and the middle flow port 202b and the lower flow port 202c are connected through the portion of the first flow cavity 201 located on the side of the second sealing member 32 away from the first sealing member 31 to form a fourth flow channel. The third flow channel and the fourth flow channel are not connected.

[0063] It is worth noting that part of 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.

[0064] In an alternative embodiment, the second sealing member 32 may also be installed at the end of the valve core 10 away from the third flow port 204, and the first sealing member 31 may be installed at the end of the valve core 10 close to the third flow port 204. In this case, a portion of 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 second sealing member 32 away from the first sealing member 31 are always in a connected state.

[0065] Please combine Figure 1 and Figure 2 In an optional embodiment, the valve seat 20 includes a first seat body 21 for supporting the driving mechanism 50, a second seat body 22 surrounding 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 arranged at intervals in the retaining ring sleeve 23. Among them, 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, the inner wall of the retaining ring sleeve 23 is radially protruded inwardly with a convex ring for separation, so as to facilitate the pressure sealing with the first sealing member 31 and the second sealing member 32. The first seat body 21 extends toward the second seat body 22 with a first assembly section 211, one end of the retaining ring sleeve 23 is sleeved on the outside of the first assembly section 211 and connected to the first seat body 21, and the radial projection size of the convex ring is substantially the same as the radial thickness of the first assembly section 211 to meet the press-fit seal with the first sealing member 31. The second seat body 22 has an assembly protrusion protruding radially outward at one end facing the retaining ring sleeve 23, and the assembly protrusion is press-fit and connected to the retaining ring sleeve 23 to meet the press-fit seal of the second sealing member 32.

[0066] Among them, the upper flow port 202a, the middle flow port 202b, and the lower flow port 202c each include a plurality of first through holes 2021 penetrating along the thickness direction of the retaining ring sleeve 23, and the plurality of first through holes 2021 are arranged at intervals along the circumferential direction of the retaining ring sleeve 23. At the same time, the second flow port 102 is a plurality of second through holes 1021 arranged at intervals along the circumferential direction of the valve core 10, and each second through hole 1021 penetrates along the thickness of the valve core 10.

[0067] Please refer to Figure 1 and Figure 3 , for example, the valve device further includes a first preloading structure 41 connected to the valve core 10. When the valve core 10 moves to the second sealing position, the first preloading structure 41 is used to apply a pressing force on the valve core 10 to press the fourth valve port 2014. At the same time, the valve device further includes a second preloading structure 42 connected to the valve core 10. When the valve core 10 moves to the fourth sealing position, the second preloading structure 42 is used to apply a pressing force on the valve core 10 to press the third valve port 2013.

[0068] Specifically, since the second seal 32 is pressed against the notch edge of the flow groove 203 corresponding to the lower flow port 202c through the sealing inclined surface 321, the settings of the first preloading structure 41 and the second preloading structure 42 are equivalent to increasing the acting force of the sealing inclined surface 321 pressing against the notch edge, further improving the sealing reliability.

[0069] In some specific embodiments, both the first preloading structure 41 and the second preloading structure 42 can adopt elastic members, such as springs.

[0070] Please continue to refer to Figure 1 and Figure 3 , optionally, the valve device further includes a driving mechanism 50 connected to the valve core 10 for driving the valve core 10 to move axially along itself to realize the 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 axially along itself through the threaded cooperation between the driving rod 52 and the nut 53, thereby driving the valve core 10 to move. Among them, the axis of the driving rod 52 is the same as the axis of the valve core 10, and the driving rod 52 and the valve core 10 are coaxially assembled. At the same time, the driving rod 52 can directly adopt a driving rod.

[0071] Such as Figure 4As shown, in an alternative embodiment, the valve device further includes a stop seat 56 connected to the valve seat 20. The stop seat 56 is sleeved outside the drive rod 52. At the same time, the valve core 10 is connected with a sliding nut 57. One end of the drive rod 52 away from the rotor assembly 51 is in threaded cooperation with the sliding nut 57. The sliding nut 57 and the stop seat 56 are cooperated through a limiting structure 58, so that the drive rod 52 can drive the sliding nut 57 to drive the valve core 10 to move axially along the drive rod 52 relative to the stop seat 56, so as to open and close each valve port. Wherein, the limiting structure 58 can prevent the sliding nut 57 from rotating around the axis of the drive rod 52 relative to the stop seat 56.

[0072] As Figure 1 and Figure 3 As shown, further, the valve core 10 includes a first valve needle 11 and a second valve needle 12. One end of the first valve needle 11 facing the drive rod 52 is provided with an assembly cavity 1101. One end of the second valve needle 12 is limited in the assembly cavity 1101 and is in limiting connection with the first valve needle 11. The other end of the second valve needle 12 is located outside the assembly cavity 1101 and is connected with the drive rod 52. The second preloading structure 42 is located in the assembly cavity 1101 and is press-fitted between the first valve needle 11 and the second valve needle 12. The first preloading structure 41 is press-fitted between the second valve needle 12 and the drive rod 52.

[0073] Specifically, one side of the assembly cavity 1101 facing the drive rod 52 is open, and a cover plate 111 is arranged at the open end. The end of the second valve needle 12 is convexly provided with a first limiting disc 121. The second preloading structure 42 is press-fitted between the first limiting disc 121 and the cover plate 111. At the same time, a sleeve 122 is connected between the second valve needle 12 and the drive rod 52. The sleeve 122 is sleeved outside one end of the second valve needle 12 and is connected with the drive rod 52. The first limiting disc 121 is integrally formed at the other end of the second valve needle 12 and can be pressed against the cavity wall of the assembly cavity 1101. A part of the drive rod 52 extends into the sleeve 122, and the drive rod 52 is radially outwardly convexly provided with a second limiting disc 521. One end of the sleeve 122 away from the second valve needle 12 abuts against one side of the second limiting disc 521 away from the second valve needle 12. The first preloading structure 41 is located inside the sleeve 122, sleeved outside the drive rod 52, and is press-fitted between the end of the second valve needle 12 and the second limiting disc 521.

[0074] Among them, in the way that the cover plate 111 is used to stop the second pre-tightening structure 42, the axial cooperation between the first valve needle 11 and the second valve needle 12 is limited. When the driving rod 52 drives the second valve needle 12 to move towards the direction close to the fourth valve port 2014, the second pre-tightening structure 42 does not need to act, and the second valve needle 12 directly pushes the first valve needle 11 to move. On the contrary, when the driving rod 52 drives the second valve needle 12 to move away from the fourth valve port 2014, the second valve needle 12 applies an elastic force to the first valve needle 11 through the second pre-tightening structure 42, so that the first valve needle 11 plays a pre-tightening role. By using the cooperation between the sleeve 122 and the driving rod 52, the axial cooperation between the driving rod 52 and the second valve needle 12 is limited. When the driving rod 52 drives the second valve needle 12 to move away from the fourth valve port 2014, the first pre-tightening structure 41 does not need to act, and the movement of the second valve needle 12 can be realized only by using the cooperation of the sleeve 122; moreover, the distance between the second valve needle 12 and the driving rod 52 will not increase. On the contrary, when the driving rod 52 drives the second valve needle 12 to move towards the direction close to the fourth valve port 2014, the limiting sleeve 122 does not work, and the driving rod 52 applies an elastic force to the second valve needle 12 by the first pre-tightening structure 41, so that the second valve needle 12 plays a pre-tightening role.

[0075] During actual use, when the valve core 10 moves to the second sealing position and the rotor assembly 51 continues to rotate in the current rotation direction, the first valve needle 11 and the second valve needle 12 are in contact, 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, since the driving rod 52 and the second valve needle 12 can be axially movably matched through the first pre-tightening mechanism, the driving rod 52 and the rotor assembly 51 move towards the direction close to the fourth valve port 2014, and the driving rod 52 squeezes the first pre-tightening structure 41 during the movement. The first pre-tightening structure 41 generates an elastic force on the second valve needle 12, and the second valve needle 12 pushes the first valve needle 11 to further squeeze the fourth valve port 2014, realizing the pre-tightening of the fourth valve port 2014 and improving the sealing performance. At the same time, when the valve core 10 moves to the fourth sealing position and the rotor assembly 51 continues to rotate in the current rotation direction, the first valve needle 11 and the second valve needle 12 are separated, 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 movably matched 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 away from the fourth valve port 2014, and the driving rod 52 drives the second valve needle 12 to squeeze the second pre-tightening structure 42 during the movement, so that the second pre-tightening structure 42 generates an elastic force on the first valve needle 11, and this elastic force can drive the first valve needle 11 to further squeeze the third valve port 2013, meeting the pre-tightening of the first valve needle 11 on the third valve port 2013 and improving the sealing performance.

[0076] Among them, for example, when the rotor assembly 51 rotates counterclockwise to drive the valve core 10 to move to the second sealing position, it rotates clockwise to drive the valve core 10 to move to the fourth sealing position.

[0077] Among them, a bearing 54 is provided between the drive rod 52 and the sleeve 122. The inner ring of the bearing 54 is fixedly sleeved on the drive rod 52, and the outer ring of the bearing 54 can be axially movably engaged with the sleeve 122. The inner wall of the sleeve 122 can prevent the rotation of the outer ring of the bearing 54, thereby reducing the friction component between the drive rod 52 and the sleeve 122, and thus reducing the rotational resistance of the valve device.

[0078] Please continue to combine Figure 1 and Figure 3 Exemplarily, a third seal 35 is provided between the valve core 10 and the valve seat 20. A balance chamber 205 is provided between one end of the valve core 10 facing the drive rod 52 and the valve seat 20. The second valve needle 12 is configured with a central through hole 1201 and a first opening 1202 communicating with the central through hole 1201. The central through hole 1201 communicates with the second flow chamber 101, the first opening 1202 communicates with the assembly chamber 1101, and the assembly chamber 1101 communicates with the balance chamber 205. In this way, the internal balance inside the valve device can be ensured, the force acting on the valve core 10 by the fluid can be reduced, and it is convenient for the valve core 10 to move.

[0079] Specifically, second openings 1102 and third openings 1103 are respectively provided on two opposite chamber walls of the assembly chamber 1101 along the axial direction of the valve core. The third opening 1103 communicates with the balance chamber 205, and the second opening 1102 communicates with the first flow chamber 201 through the second flow chamber 101 and the second flow port 102. The second valve needle 12 passes through the third opening 1103, and the central through hole 1201 communicates with the third opening 1103. In this way, the flow of the internal air flow when the valve core 10 moves can be satisfied to ensure the internal balance setting.

[0080] Among them, to prevent fluid leakage. At the same time, the outer peripheral surface of the valve seat 20 is configured with a fourth seal groove 206 to install a fourth seal. The fourth seal is pressed between the valve seat 20 and the valve body to achieve a sealing effect.

[0081] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0082] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A valve device, characterized in that, The valve device includes a valve core (10) and a valve seat (20); The valve seat (20) is configured with a first flow cavity (201). The valve core (10) is movably disposed within the first flow cavity (201). A first seal (31) and a second seal (32) are sleeved on the outer peripheral side of the valve core (10). The first seal (31) and the second seal (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 at intervals along the axial direction of the valve core within the first flow cavity (201); 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 seal (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 seal (31) seals the second valve port (2012), and the second seal (32) seals the fourth valve port (2014).

2. The valve device according to claim 1, characterized in that, The valve core (10) in the first sealing position drives the first seal (31) to slide along the cavity wall of the first flow cavity (201) by a first movement gap to the second sealing position.

3. The valve device according to claim 2, characterized in that, The first seal (31) is in movable sealing fit with the cavity wall of the first flow cavity (201), and the second seal (32) is in movable sealing fit with the cavity wall of the first flow cavity (201) or in limit sealing fit with the fourth valve port (2014).

4. The valve device according to claim 2, characterized in that, 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.

5. The valve device according to claim 4, characterized in that, The second seal (32) protrudes radially from the first seal (31) along the axial direction of the valve core. Sealing inclined surfaces (321) are provided on both sides of the second seal (32) along the axial direction of the valve core. Both of the two sealing inclined surfaces (321) are inclined radially outward and towards each other from the same-side end face of the second seal (32) along the axial direction of the valve core, so that the thickness of the second seal (32) gradually decreases.

6. The valve device according to claim 5, characterized in that, Sealing protrusions (311) are provided on both sides of the first seal (31) along the axial direction of the valve core. Each sealing protrusion (311) protrudes radially outward along the axial direction of the valve core.

7. The valve device according to claim 1, characterized in that, A first valve port (2011) and a third valve port (2013) are further arranged along the axial direction of the valve core within the first flow cavity (201). 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 arranged corresponding to the first seal (31), and the third valve port (2013) and the fourth valve port (2014) are arranged corresponding to the second seal (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 seal (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 seal (31) seals the first valve port (2011), and the second seal (32) seals the third valve port (2013).

8. The valve device according to claim 7, characterized in that, 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) that are communicated with the first flow cavity (201) and arranged at intervals along the axial direction of the valve core. The first valve port (2011) and the second valve port (2012) are located on both sides of the upper flow port (202a) along the axial direction of the valve core. The third valve port (2013) and the fourth valve port (2014) are located on both sides of the lower flow port (202c) along the axial direction of the valve core. And 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); When the valve core (10) is in the second sealing position, the upper flow port (202a) is communicated with the third flow port (204), and the middle flow port (202b) is communicated with the lower flow port (202c); when the valve core (10) is in the fourth sealing position, the lower flow port (202c) is communicated with the third flow port (204), and the upper flow port (202a) is communicated with the middle flow port (202b).

9. The valve device according to claim 8, characterized in that, The valve core (10) is configured with a second flow cavity (101) and a second flow port (102) communicated with the second flow cavity (101), and the second flow port (102) is located at one end of the valve core in the axial direction. The second flow cavity (101) is communicated with the first flow cavity (201) through the second flow port (102); When the valve core (10) is in the second sealing position, the upper flow port (202a) is communicated with the third flow port (204) through the first flow cavity (201), the second flow port (102), and the second flow cavity (101).

10. The valve device according to claim 9, characterized in that, The valve device 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 press the fourth valve port (2014); and / or, The valve device further includes a second preloading structure (42) connected to the valve core (10). When the valve core (10) moves to the fourth sealing position, the second preloading structure (42) is configured to apply a force to the valve core (10) to press the third valve port (2013).

11. The valve device according to claim 10, characterized in that, The valve device further includes a drive rod (52) connected to the valve core (10); The valve core (10) includes a first valve needle (11) and a second valve needle (12). An assembly cavity (1101) is formed at one end of the first valve needle (11) along the axial direction of the valve core and facing the drive rod (52). One end of the second valve needle (12) is received in the assembly cavity (1101) and connected to the first valve needle (11), and the other end of the second valve needle (12) is located outside the assembly cavity (1101) and connected to the drive rod (52). The second preloading structure (42) is located in the assembly cavity (1101) and is press-fitted between the second valve needle (12) and the first valve needle (11), and the first preloading structure (41) is press-fitted between the second valve needle (12) and the drive rod (52); Both the first seal (31) and the second seal (32) are sleeved on the first valve needle (11); The drive rod (52) drives the first valve needle (11) to move in the first flow cavity (201) through the second valve needle (12) to block or close the valve port. When the valve core (10) moves to the second sealing position, the first preloading structure (41) is in a compressed state. When the valve core (10) moves to the fourth sealing position, the second preloading structure (42) is in a compressed state.

12. The valve device according to claim 11, characterized in that, A third seal is provided between the valve core (10) and the valve seat (20). A balance cavity (205) is provided between one end of the first valve needle (11) facing the drive rod (52) and the valve seat (20). The second valve needle (12) is configured with a central through hole (1201) and a first opening (1202) communicating with the central through hole (1201). The central through hole (1201) communicates with the second flow cavity (101), the first opening (1202) communicates with the assembly cavity (1101), and the assembly cavity (1101) communicates with the balance cavity (205).

13. An air conditioning system, characterized in that, The air-conditioning system includes the valve device according to any one of claims 1 to 12.

14. A vehicle, characterized in that, The vehicle includes the air-conditioning system according to claim 13.

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