Valve device

Abstract

According to the valve device, a valve element is arranged in a first circulation cavity of a valve seat, and the peripheral side of the valve element is sleeved with a first sealing part and a second sealing part. In the first sealing position, the first sealing part seals the first valve port, the second sealing part seals the third valve port, and in the second sealing position, the first sealing part seals the second valve port, and the second sealing part seals the fourth valve port. When the moving distance of the valve element from the second sealing position to the first sealing position is smaller than a second preset distance, the first valve port, the third valve port and the fourth valve port are opened, and the second valve port is sealed; and the first circulation cavity on the side, deviating from the second sealing part, of the first sealing part communicates with the first circulation cavity on the side, facing the second sealing part, of the first sealing part through the first communication port, the second circulation cavity, the second communication port, the fourth valve port and the third valve port in sequence. The hardness of the second sealing part is larger than that of the first sealing part. According to the valve device, on the basis that the multiple valve ports are sealed at the same time, the problem that a sealing piece is prone to being separated from the valve element is solved.

Description

Technical Field

[0001] The present application relates to the field of valve body technology, and in particular to a valve device. Background Art

[0002] Generally, a multi-way valve needs to be equipped with multiple seals to adjust the connection status between each valve port. When the seal is made of soft rubber, the rubber does not deform and can achieve complete sealing of the valve port. However, in the process of switching the valve port, a large pressure difference is easily formed on both sides of the seal, causing the seal to be severely impacted by the pressure difference on both sides, which in turn causes the sealing strip to deform and affect the sealing performance. Utility Model Content

[0003] Based on this, it is necessary to provide a valve device that can solve the problem that the sealing member is easily separated from the valve core while achieving simultaneous sealing of multiple valve ports.

[0004] When the valve core is in the first sealing position, the first sealing portion seals the first valve port and opens the second valve port, and the sealing portion seals the first valve port and opens the second valve port. Three valve ports and an open fourth valve port, when the valve core is in the second sealing position, the first sealing portion seals the second valve port and opens the first valve port, and the second sealing portion seals the fourth valve port and opens the third valve port; when the distance the valve core moves from the second sealing position to the first 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 portion away from the second sealing portion is connected to the first flow cavity on the side of the first sealing portion toward the second sealing portion; the hardness of the second sealing portion is greater than the hardness of the first sealing portion.

[0005] In one embodiment, when the distance the valve core moves from the second sealing position to the first sealing position is the second preset distance, the second valve port moves from the sealing state to the just-opened state, and the third valve port, the fourth valve port, and the first valve port are all in the open state. According to the valve device of the claim, when the distance the valve core moves from the first 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 the open state, the first valve port is in the sealing state, the second valve port is in the open state, and the second valve port can sequentially connect the third valve port and the fourth valve port; the first flow cavity on the side of the first sealing portion facing away from the second sealing portion is connected to the first flow cavity on the side of the first sealing portion facing the second sealing portion.

[0006] In one embodiment, when the distance the valve core moves from the first 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.

[0007] In one embodiment, the first sealing portion and the inner wall of the first flow chamber are movably sealed together along the axial direction of the valve core.

[0008] In one embodiment, the first sealing portion includes a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are arranged at intervals along the axial direction of the valve core; when the distance the valve core moves from the second sealing position to the first sealing position is less than the second preset distance, the second sealing ring and the inner wall of the first circulation cavity are sealed to close the second valve port; when the distance the valve core moves from the first 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 to close the first valve port.

[0009] In one embodiment, when the distance the valve core moves from the second sealing position to the first sealing position is the 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 the third valve port and the fourth valve port are both in an open state; when the distance the valve core moves from the first sealing position to the second sealing position is the 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 the third valve port and the fourth valve port are both in an open state.

[0010] In one embodiment, the radial dimension of the second sealing portion along the valve core is greater than the radial dimension of the third valve port along the valve core, and the radial dimension of the second sealing portion along the valve core is greater than the radial dimension of the fourth valve port along the valve core; the second sealing portion and the third valve port limit seal cooperate, and the second sealing portion and the fourth valve port limit seal cooperate.

[0011] In one embodiment, a limit groove is provided on the outer peripheral side of the valve core and is arranged around the valve core itself in an axial direction. An assembly port is provided on the end of the limit groove away from the valve core. The first sealing portion is sleeved in the limit groove through the assembly port and fits tightly with the inner wall of the limit groove.

[0012] In one of the embodiments, the width of the radial cross-section of the limiting groove along the axial direction of the valve core is equal to the width of the assembly port along the axial direction of the valve core, and the width of the radial cross-section of the limiting groove along the axial direction of the valve core is smaller than its own width along the radial direction of the valve core; the maximum width of the first sealing portion in the limiting groove along the axial direction of the valve core is smaller than its own width along the radial direction of the valve core.

[0013] In one embodiment, the first sealing part includes a main body and a sealing head. The first sealing part is clamped in the limit slot through the main body. One end of the sealing head is connected to the main body, and the other end extends out of the limit slot through the assembly port and cooperates with the inner wall of the first circulation cavity in a movably sealed manner. The width of the sealing head along the axial direction of the valve core is smaller than the width of the main body along the axial direction of the valve core.

[0014] In one embodiment, the limit locking groove includes a first groove and a second groove, the first groove extends radially along the valve core, and the assembly port is arranged at one end of the first groove away from the valve core axis, one end of the second groove is connected to the end of the first groove away from the assembly port, and the other end extends axially along the valve core; the first sealing part includes a first part and a second part, the first part is clamped in the first groove, and the second part is clamped in the second groove; the axial length of the second groove along the valve core is greater than the axial length of the first groove along the valve core; the axial length of the second part along the valve core is greater than the axial length of the first groove along the valve core; or, the axial length of the second groove along the valve core is equal to the axial length of the first groove along the valve core, and the inner wall of the second groove has a protrusion along the axial direction of the valve core, and at least part of the protrusion extends deep into the second part.

[0015] In one embodiment, there are two second sealing parts, each of which is movably sealed with the inner wall of the valve core, one of the second sealing parts is sealed with the third valve port, and the other second sealing part is sealed with the fourth valve port; the valve core has retaining grooves for respectively installing the two second sealing parts.

[0016] In one embodiment, the second sealing part is a plastic part, and the first sealing part is a rubber part.

[0017] In one embodiment, the first communication port is disposed on a side wall of the valve core, and the second communication port is disposed on an end portion of the valve core.

[0018] Compared with the prior art, the valve device provided in the present application, first, when the valve core is in the second sealing position, the second valve port and the fourth valve port are both in a sealed state, and when the valve core initially disengages (that is, the moving distance is less than the second preset distance) from the second sealing position and moves toward the first sealing position, the fourth valve port is opened and the second valve port is still in a sealed state; thereafter, the second valve port is opened and the first valve port is closed, until the fourth valve port is closed and the valve core moves to the first sealing position.

[0019] During this moving distance, when the valve core initially leaves the second sealing position (the second valve port is still in a sealed state), the first flow cavity on the side of the first sealing part away from the second sealing part can be connected to the first flow cavity on the side of the first sealing part toward the second sealing part through the first valve port, the first connecting port, the second flow cavity, the second connecting port, the fourth valve port and the third valve port in sequence, that is, the first flow cavities on both sides of the first sealing part are in a mutually connected state. Therefore, at this time, the medium pressures on both sides of the first sealing part are equal, and the first sealing part will not be impacted by the fluid pressure difference on both sides, thereby effectively preventing the first sealing part from being deformed.

[0020] Furthermore, by balancing the fluid pressure on both sides of the first sealing portion, the resistance to the movement of the valve core can be reduced;

[0021] In addition, when the distance the valve core moves from the second sealing position to the first sealing position is a second preset distance, the second valve port moves from the sealed state to the just opened state, and the third valve port, the fourth valve port, and the first valve port are all in the open state, ensuring that when the second sealing part detaches from the second valve port, the first sealing part will still not be impacted by the pressure difference of the medium on both sides, thereby effectively preventing the first sealing part from escaping from the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic structural diagram of a valve device according to an embodiment of the present application;

[0024] Figure 2 A cross-sectional view of a valve device according to an embodiment of the present application when the valve device is in a first sealing position;

[0025] Figure 3 A cross-sectional view of a valve device according to an embodiment of the present application when the valve device is in a second sealing position;

[0026] Figure 4 A schematic diagram of a partial structure of a valve device according to an embodiment of the present application;

[0027] Figure 5 A partial cross-sectional view of a valve device according to an embodiment of the present application;

[0028] Figure 6 A partial cross-sectional view of a valve device according to another embodiment of the present application;

[0029] Figure 7 A partial cross-sectional view of a valve device according to another embodiment of the present application.

[0030] 1. The valve core is provided with a valve seat, a valve body and a valve stem. The valve body is provided with a valve stem and a valve stem. The valve body is provided with a valve stem and a valve stem. The valve body is provided with a valve stem and a valve stem. The valve body is provided with a valve stem and a valve stem. DETAILED DESCRIPTION

[0031] See also Figure 1-Figure 7 The present application provides a valve device, which includes a valve core 100 and a valve seat 200. The valve seat 200 is provided with a first circulation cavity 210. The valve core 100 is movably arranged in the first circulation cavity 210. The outer peripheral side of the valve core 100 is sleeved with a first sealing portion 300 and a second sealing portion 400 arranged along its own axial direction. The first circulation cavity 210 is provided with a first valve port 211, a second valve port 212, a third valve port 213 and a fourth valve port 214 arranged in sequence along the axial direction of the valve core 100.

[0032] Specifically, Figure 2 and Figure 3 As shown, the valve seat 200 is provided with a first opening 221, a second opening 222, a third opening 223 and a fourth opening 224, and the first opening 221, the second opening 222, the third opening 223 and the fourth opening 224 are respectively connected to external pipelines (not shown). The first opening 221 and the third opening 223 are arranged at one end of the valve seat 200, and the second opening 222 and the fourth opening 224 are arranged at the other end of the valve seat 200, and along the axial direction of the valve core 100, the first opening 221, the second opening 222, the third opening 223 and the fourth opening 224 are arranged in sequence.

[0033] Furthermore, one end of the first opening 221 close to the valve core 100 is arranged between the first valve port 211 and the second valve port 212, one end of the second opening 222 close to the valve core 100 is arranged between the second valve port 212 and the third valve port 213, one end of the third opening 223 close to the valve core 100 is arranged between the third valve port 213 and the fourth valve port 214, and one end of the fourth opening 224 close to the valve core 100 is arranged on the side of the fourth valve port 214 away from the third valve port 213.

[0034] Of course, in other embodiments, the first opening 221 can also be arranged on the side of the first valve port 211 away from the second valve port 212, the second opening 222 is arranged between the first valve port 211 and the second valve port 212, the third opening 223 is arranged between the second valve port 212 and the third valve port 213, and the fourth opening 224 is arranged between the third valve port 213 and the fourth valve port 214.

[0035] like Figure 2 and Figure 3 As shown, the valve core 100 is provided with a second circulation cavity 110 , and two ends of the second circulation cavity 110 are provided with a first communication port 120 and a second communication port 130 which can be connected to the first circulation cavity 210 respectively.

[0036] Specifically, in one embodiment, if Figure 2 and Figure 3 As shown, the first communication port 120 is disposed on the side wall of the valve core 100, and the second communication port 130 is disposed at the end of the valve core 100. In addition, the first communication port 120 is disposed at one end of the valve core 100 close to the first valve port 211, and the second communication port 130 is disposed at one end of the valve core 100 close to the fourth valve port 214.

[0037] However, the present invention is not limited thereto. In other embodiments, the first communication port 120 may also be disposed at an end portion, and the second communication port 130 may also be disposed at a side wall of the valve core 100 .

[0038] In one embodiment, if Figure 1 , Figure 2 and Figure 3As shown, the valve device also includes a driving mechanism 500 connected to the valve core 100, which is used to drive the valve core 100 to move along its own axial direction to achieve the switching of different working modes of the valve device. Among them, the driving mechanism 500 includes a rotor assembly 510, a driving rod 520 and a nut 530, the nut 530 is installed on the valve seat 200, and is threadedly connected to the driving rod 520, one end of the driving rod 520 is fixedly connected to the rotor assembly 510, and the other end is connected to the valve core 100. During operation, the rotor assembly 510 can rotate the driving rod 520, so as to promote the driving rod 520 to move along its own axial direction through the threaded cooperation between the driving rod 520 and the nut 530, thereby driving the valve core 100 to move along its own axial direction. Among them, the axial direction of the driving rod 520 is the same as the axial direction of the valve core 100, and the driving rod 520 is coaxially assembled with the valve core 100.

[0039] It should be noted that, in one embodiment, the first sealing portion 300 is disposed at an end of the valve core 100 close to the driving mechanism 500 , and the second sealing portion 400 is disposed at an end of the valve core 100 away from the driving mechanism 500 .

[0040] But not limited thereto, in another embodiment, the first sealing portion 300 is disposed at an end of the valve core 100 away from the driving mechanism 500 , and the second sealing portion 400 is disposed at an end of the valve core 100 close to the driving mechanism 500 .

[0041] like Figure 2 As shown, when the valve core 100 is in the first sealing position, the first sealing portion 300 seals the first valve port 211 and opens the second valve port 212, and the second sealing portion 400 seals the third valve port 213 and opens the fourth valve port 214. At this time, the first opening 221 is connected to the second opening 222 through the second valve port 212, and the third opening 223 is connected to the fourth opening 224 through the fourth valve port 214.

[0042] like Figure 3 As shown, when the valve core 100 is in the second sealing position, the first sealing portion 300 seals the second valve port 212 and opens the first valve port 211, and the second sealing portion 400 seals the fourth valve port 214 and opens the third valve port 213. At this time, the first opening 221 is connected to the fourth opening 224 through the first valve port 211 and the second flow chamber 110, and the second opening 222 is connected to the third opening 223 through the third valve port 213.

[0043] The hardness of the second sealing part 400 is greater than that of the first sealing part 300. Since the second sealing part 400 has a greater hardness, it is not easy to deform even when impacted by a fluid pressure difference, and there will be no problem of falling off after deformation.

[0044] The following content describes the movement of the valve core 100 from the first sealing position to the second sealing position.

[0045] When the distance that the valve core 100 moves from the first sealing position to the second sealing position is less than the first preset distance, the third valve port 213 and the fourth valve port 214 are both in an open state, the first valve port 211 is in a sealed state, the second valve port 212 is in an open state, and the second valve port 212 can sequentially communicate with the third valve port 213 and the fourth valve port 214. The first flow cavity 210 of the first sealing portion 300 facing away from the second sealing portion 400 is connected to the first flow cavity 210 of the first sealing portion 300 facing the second sealing portion 400.

[0046] When the valve core 100 is in the first sealing position, the first valve port 211 and the third valve port 213 are both in a sealed state, and when the valve core 100 initially disengages (i.e., the moving distance is less than the first preset distance) from the first sealing position, the third valve port 213 is opened, but the first valve port 211 is still in a sealed state. At this time, the first flow cavity 210 of the first sealing part 300 away from the second sealing part 400 side can be connected to the first flow cavity 210 of the first sealing part 300 toward the second sealing part 400 through the first connecting port 120, the second connecting port 110, the second connecting port 130, the fourth valve port 214, the third valve port 213 and the second valve port 212 in sequence. That is, the first flow cavity 210 on both sides of the first valve port 211 are in a state of mutual communication. Therefore, at this time, the fluid pressure on both sides of the first sealing part 300 is equal. Therefore, within the range of the moving distance, the first sealing portion 300 will not be impacted by the pressure difference of the fluid located on both sides of the first valve port 211, thereby effectively preventing the first sealing portion 300 from being deformed.

[0047] Afterwards, the valve core 100 continues to move. When the distance moved by the valve core 100 from the first sealing position to the second sealing position is the first preset distance, the first valve port 211 moves from the sealing state to the just-opened state, and the third valve port 213, the fourth valve port 214, and the second valve port 212 are all in the open state. The third valve port 213, the fourth valve port 214, and the second valve port 212 are interconnected, and the fluid pressure on both sides of the first sealing portion 300 remains equal. This arrangement can avoid the second valve port 212 reaching the sealing state when the first sealing portion 300 is not separated from the first valve port 211. If the second valve port 212 has reached the sealing state when the first sealing portion 300 is not separated from the first valve port 211, the fluid pressure on the first sealing portion 300 will be unbalanced, and the first sealing portion 300 will be easily deformed.

[0048] Afterwards, the valve core 100 continues to move, and when the valve core 100 moves from the first preset distance to the second valve port 212 closing, the first valve port 211, the third valve port 213, and the fourth valve port 214 are all in an open state, and the first flow cavity 210 of the first sealing part 300 away from the second sealing part 400 side can be connected to the first flow cavity 210 of the first sealing part 300 toward the second sealing part 400 side through the first valve port 211, the first connecting port 120, the second connecting port 110, the second connecting port 130, the fourth valve port 214, and the third valve port 213 in sequence, that is, within the moving distance range, the first sealing part 300 will not be affected by the impact of the fluid pressure difference on both sides.

[0049] Afterwards, the valve core 100 continues to move, and the valve core 100 moves from the second valve port 212 to the second sealing position while maintaining the closed state. Before the fourth valve port 214 is closed, the first valve port 211, the third valve port 213, and the fourth valve port 214 are all in an open state, and the first flow cavity 210 of the first sealing part 300 away from the second sealing part 400 can be connected to the first flow cavity 210 of the first sealing part 300 toward the second sealing part 400 through the first valve port 211, the first connecting port 120, the second connecting port 110, the second connecting port 130, the fourth valve port 214, and the third valve port 213 in sequence, that is, the first sealing part 300 will not be impacted by the pressure difference of the fluid on both sides, and the first sealing part 300 will not be deformed and fall out.

[0050] It can be seen that when the valve core 100 moves from the first sealing position to the second sealing position, the first sealing part 300 is not impacted by the pressure difference of the fluid on both sides thereof from the opening of the third valve port 213 to the closing of the fourth valve port 214. In addition, during the movement of the valve core 100, the sealing stroke of the second valve port 212 is increased, so that before the second sealing part 400 completes the sealing of the fourth valve port 214, the first sealing part 300 seals the second valve port 212 in advance, and when the second valve port 212 is sealed, the first sealing part 300 slides a certain distance to achieve synchronous sealing of the second valve port 212 and the fourth valve port 214.

[0051] The following content describes the movement of the valve core 100 from the second sealing position to the first sealing position.

[0052] When the distance that the valve core 100 moves from the second sealing position to the first sealing position is less than the second preset distance, the third valve port 213 and the fourth valve port 214 are both in an open state, the second valve port 212 is in a sealed state, the first valve port 211 is in an open state, and the first flow cavity 210 of the first sealing part 300 away from the second sealing part 400 can be connected to the first flow cavity 210 of the first sealing part 300 toward the second sealing part 400 through the first valve port 211, the first communication port 120, the second flow cavity 110, the second communication port 130, the fourth valve port 214 and the third valve port 213 in sequence, that is, the first flow cavity 210 on both sides of the second valve port 212 is in a mutually connected state, therefore, at this time, the fluid pressure on both sides of the first sealing part 300 is equal. Therefore, within the moving distance range, the first sealing part 300 will not be impacted by the fluid pressure difference on both sides of the second valve port 212, thereby effectively preventing the first sealing part 300 from being deformed.

[0053] Afterwards, the valve core 100 continues to move. When the distance moved by the valve core 100 from the second sealing position to the first sealing position is the second preset distance, the second valve port 212 moves from the sealing state to the just-opened state, the third valve port 213, the fourth valve port 214, and the first valve port 211 are all in the open state, and the fluid pressure on both sides of the first sealing portion 300 remains equal. This arrangement can avoid the first valve port 211 reaching the sealing state when the first sealing portion 300 has not separated from the second valve port 212. If the first valve port 211 has reached the sealing state when the first sealing portion 300 has not separated from the second valve port 212, the fluid pressure on the first sealing portion 300 will be unbalanced, and the first sealing portion 300 will be easily deformed.

[0054] Afterwards, the valve core 100 continues to move, and when the valve core 100 moves from the second preset distance to the first valve port 211 being closed, the second valve port 212, the third valve port 213, and the fourth valve port 214 are all in an open state, and the first flow cavity 210 of the first sealing part 300 away from the second sealing part 400 side can be connected to the first flow cavity 210 of the first sealing part 300 toward the second sealing part 400 side through the first connecting port 120, the second connecting port 110, the second connecting port 130, the fourth valve port 214, the third valve port 213, and the second valve port 212 in sequence, that is, within the range of the moving distance, the first sealing part 300 will not be affected by the impact of the fluid pressure difference on both sides.

[0055] Afterwards, the valve core 100 continues to move, and the valve core 100 moves from the first valve port 211 to the first sealing position while maintaining the closed state. Before the third valve port 213 is closed, the second valve port 212, the third valve port 213, and the fourth valve port 214 are all in an open state, and the first flow cavity 210 of the first sealing part 300 away from the second sealing part 400 can be connected to the first flow cavity 210 of the first sealing part 300 toward the second sealing part 400 through the first connecting port 120, the second flow cavity 110, the second connecting port 130, the fourth valve port 214, the third valve port 213, and the second valve port 212 in sequence, that is, the first sealing part 300 will not be impacted by the pressure difference of the fluid on both sides, and the first sealing part 300 will not be deformed and fall out.

[0056] It can be seen that when the valve core 100 moves from the second sealing position to the first sealing position, the first sealing part 300 is not impacted by the pressure difference of the fluid on both sides thereof from the opening of the fourth valve port 214 to the closing of the third valve port 213. In addition, during the movement of the valve core 100, the sealing stroke of the first valve port 211 is increased, so that before the second sealing part 400 completes the sealing of the third valve port 213, the first sealing part 300 seals the first valve port 211 in advance, and when the first valve port 211 is sealed, the first sealing part 300 slides a distance, and then realizes the synchronous sealing of the first valve port 211 and the third valve port 213.

[0057] Furthermore, by balancing the fluid pressure on both sides of the first sealing portion 300 , the resistance to the movement of the valve core 100 can be reduced.

[0058] In one embodiment, the hardness of the second sealing portion 400 is greater than the hardness of the first sealing portion 300 .

[0059] When the pressure difference between the two sides of the second sealing part 400 is relatively large, such a configuration can reduce the degree of deformation of the second sealing part 400 under the action of the pressure difference, thereby preventing the second sealing part 400 from being separated from the valve core 100 .

[0060] Specifically, in one embodiment, the second sealing portion 400 is a plastic member, such as polytetrafluoroethylene, polyimide, or polyetherketone, which are not listed here one by one.

[0061] At this time, the second sealing portion 400 is not easily damaged under the action of the pressure difference, which greatly improves the structural strength of the second sealing portion 400.

[0062] Correspondingly, the first sealing portion 300 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.

[0063] In one embodiment, if Figure 2 and Figure 3As shown, the first sealing portion 300 and the inner wall of the first flow cavity 210 are movably sealed along the axial direction of the valve core 100 .

[0064] Specifically, radial pressure is applied to the first sealing portion 300 through the inner wall of the first circulation cavity 210 , so that the first sealing portion 300 completes the sealing of the first valve port 211 or the second valve port 212 .

[0065] Since the first sealing portion 300 can move axially along the valve core 100 relative to the valve seat 200 , such a configuration is beneficial to increasing the sealing stroke of the first sealing portion 300 .

[0066] Further, in one embodiment, if Figure 2-Figure 4 As shown, the first sealing portion 300 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.

[0067] 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 100 .

[0068] The following content describes the movement of the valve core 100 with the first sealing ring 310 and the second sealing ring 320 from the second sealing position to the first sealing position.

[0069] When the valve core 100 is in the second sealing position, the second sealing ring 320 seals the second valve port 212, the first sealing ring 310 is separated from the first valve port 211, the second sealing portion 400 seals the fourth valve port 214, and the third valve port 213 is open. When the distance that the valve core 100 moves from the second sealing position to the first sealing position is less than the second preset distance, the first valve port 211, the third valve port 213, and the fourth valve port 214 are all in an open state and are interconnected, and the second sealing ring 320 and the inner wall of the first circulation chamber 210 are sealed to close the second valve port 212. In addition, at this time, the first sealing ring 310 is located between the first valve port 211 and the second valve port 212 and does not play a sealing role. The first valve port 211 is in an open state, and the fluid pressure on both sides of the first sealing ring 310 is equal. The first circulation cavity 210 of the second sealing ring 320 away from the second sealing part 400 can be connected to the first circulation cavity 210 of the second sealing ring 320 toward the second sealing part 400 through the first valve port 211, the first communication port 120, the second circulation cavity 110, the second communication port 130, the fourth valve port 214 and the third valve port 213 in sequence, and the fluid pressures on both sides of the second sealing ring 320 are equal. Therefore, within the range of the moving distance, the first sealing ring 310 and the second sealing ring 320 will not be impacted by the fluid pressure difference.

[0070] Afterwards, when the valve core 100 moves from the second sealing position to the first sealing position a second preset distance, the second sealing ring 320 disengages from the second valve port 212, and the first sealing ring 310 does not close the first valve port 211. The first valve port 211, the second valve port 212, the third valve port 213 and the fourth valve port 214 are all in an open state and interconnected, and the fluid pressures on both sides of the first sealing ring 310 and the second sealing ring 320 are equal.

[0071] Subsequently, the first sealing ring 310 closes the first valve port 211 until the fourth valve port 214 is closed, and the second valve port 212, the third valve port 213 and the fourth valve port 214 are all in an open state and connected to each other. The second sealing ring 320 is separated from the second valve port 212, and the fluid pressure on both sides of the second sealing ring 320 is equal. The first circulation cavity 210 of the first sealing ring 310 away from the second sealing part 400 can be connected to the first circulation cavity 210 of the first sealing ring 310 facing the second sealing part 400 through the first connecting port 120, the second connecting port 110, the second connecting port 130, the fourth valve port 214, the third valve port 213 and the second valve port 212 in sequence, and the fluid pressure on both sides of the first sealing ring 310 is equal.

[0072] Finally, the valve core 100 is located at the first sealing position, the first sealing ring 310 seals the first valve port 211, the second sealing ring 320 is separated from the second valve port 212, the second sealing part 400 seals the third valve port 213, and the fourth valve port 214 is opened.

[0073] Therefore, when the valve core 100 moves from the second sealing position to the first sealing position, from the opening of the fourth valve port 214 to the closing of the third valve port 213 , the first sealing ring 310 and the second sealing ring 320 are never impacted by the pressure difference of the fluid on both sides thereof.

[0074] The following content describes the movement of the valve core 100 with the first sealing ring 310 and the second sealing ring 320 from the first sealing position to the second sealing position.

[0075] When the valve core 100 is in the first sealing position, the first sealing ring 310 seals the first valve port 211, the second sealing ring 320 is separated from the second valve port 212, the second sealing portion seals the third valve port 213, and the fourth valve port 214 is open. When the distance that the valve core 100 moves from the first sealing position to the second sealing position is less than the first preset distance, the second valve port 212, the third valve port 213, and the fourth valve port 214 are all in an open state and are interconnected, and the first sealing ring 310 and the inner wall of the first flow chamber 210 are always sealed and matched to close the first valve port 211. In addition, at this time, the second sealing ring 320 is located between the first valve port 211 and the second valve port 212 and does not play a sealing role. The second valve port 212 is in an open state, and the fluid pressure on both sides of the second sealing ring 320 is equal. The first flow cavity 210 on the side of the first sealing ring 310 away from the second sealing part 400 can be connected to the first flow cavity 210 on the side of the first sealing ring 310 facing the second sealing part 400 through the first communication port 120, the second flow cavity 110, the second communication port 130, the fourth valve port 214, the third valve port 213 and the second valve port 212 in sequence, and the fluid pressures on both sides of the first sealing ring 310 are equal. Therefore, within the moving distance range, the first sealing ring 310 and the second sealing ring 320 will not be impacted by the fluid pressure difference.

[0076] Afterwards, when the distance the valve core 100 moves from the first sealing position to the second sealing position is a second preset distance, the first sealing ring 310 disengages from the first valve port 211, and the second sealing ring 320 does not close the second valve port 212. The first valve port 211, the second valve port 212, the third valve port 213 and the fourth valve port 214 are all in an open state and interconnected, and the fluid pressures on both sides of the first sealing ring 310 and the second sealing ring 320 are equal.

[0077] Subsequently, the second sealing ring 320 keeps the second valve port 212 closed until the fourth valve port 214 is closed, and the first valve port 211, the third valve port 213, and the fourth valve port 214 are all in an open state and connected to each other. The first sealing ring 310 is separated from the first valve port 211, and the fluid pressure on both sides of the first sealing ring 310 is equal. The first circulation cavity 210 of the second sealing ring 320 away from the second sealing part 400 can be connected to the first circulation cavity 210 of the second sealing ring 320 toward the second sealing part 400 through the first valve port 211, the first connecting port 120, the second circulation cavity 110, the second connecting port 130, the fourth valve port 214, and the third valve port 213 in sequence, and the fluid pressure on both sides of the second sealing ring 320 is equal.

[0078] Finally, the valve core 100 is located at the second sealing position, the second sealing ring 320 seals the second valve port 212, the first sealing ring 310 is separated from the first valve port 211, the second sealing part 400 seals the fourth valve port 214, and the third valve port 213 is opened.

[0079] Therefore, when the valve core 100 moves from the first sealing position to the second sealing position, from the opening of the third valve port 213 to the closing of the fourth valve port 214, the first sealing ring 310 and the second sealing ring 320 are never impacted by the pressure difference of the fluid on both sides thereof.

[0080] With such arrangement, when there is no pressure difference on both sides of the first sealing portion 300 , the first sealing ring 310 will not separate from the valve core 100 , and under the squeezing effect of the inner wall of the first circulation cavity 210 , the second sealing ring 320 will not separate from the valve core 100 .

[0081] When the distance that the valve core 100 moves from the second sealing position to the first sealing position is the second preset distance, the second valve port 212 is just opened, the first sealing ring 310 and the first valve port 211 are in a non-closed state, the second valve port 212 and the second sealing ring 320 are in a non-closed state, and the third valve port 213 and the fourth valve port 214 are both in an open state. This arrangement avoids the situation where the second valve port 212 is not opened and the first valve port 211 has become closed.

[0082] When the distance that the valve core 100 moves from the first sealing position to the second sealing position is less than the first preset distance, the first sealing ring 310 and the inner wall of the first flow chamber 210 are sealed to close the first valve port 211. In addition, at this time, the second sealing ring 320 is located between the first valve port 211 and the second valve port 212 and does not play a sealing role.

[0083] When the distance that the valve core 100 moves from the first sealing position to the second sealing position is the first preset distance, the first valve port 211 is just opened, the first sealing ring 310 and the first valve port 211 are in a non-closed state, the second valve port 212 and the second sealing ring 320 are in a non-closed state, and the third valve port 213 and the fourth valve port 214 are both in an open state. This arrangement prevents the first valve port 211 from being closed when the second valve port 212 is not opened. This arrangement prevents the second valve port 212 from being closed when the first valve port 211 is not opened.

[0084] In another embodiment, the first sealing ring 310 and the second sealing ring 320 may also be integrally formed. Specifically, the first sealing ring 310 and the second sealing ring 320 may be two ends of the cylindrical first sealing portion 300 .

[0085] In one embodiment, if Figure 2 and Figure 3As shown, the radial dimension of the second sealing portion 400 along the valve core 100 is greater than the radial dimension of the third valve port 213 along the valve core 100, and the radial dimension of the second sealing portion 400 along the valve core 100 is greater than the radial dimension of the fourth valve port 214 along the valve core 100. The second sealing portion 400 and the third valve port 213 are in position-limiting sealing cooperation, and the second sealing portion 400 and the fourth valve port 214 are in position-limiting sealing cooperation.

[0086] Specifically, the radial width of the second sealing portion 400 is greater than the radial width of the third valve port 213, and the radial width of the second sealing portion 400 is greater than the radial width of the fourth valve port 214. The second sealing portion 400 axially squeezes the third valve port 213 or the fourth valve port 214 to achieve sealing of the third valve port 213 or the fourth valve port 214.

[0087] More specifically, the outer side wall of the second sealing portion 400 away from the valve core 100 is an olive-shaped structure with a convex middle and contracted ends, so as to facilitate the sealing cooperation between the second sealing portion 400 and the third valve port 213 or the fourth valve port 214 .

[0088] With such arrangement, even if the second sealing portion 400 is worn, the second sealing portion 400 can still maintain a good sealing effect at the third valve port 213 and the fourth valve port 214 under pressure.

[0089] Furthermore, it should be noted that, in another embodiment, the second sealing portion 400 may also be sealably matched with the inner wall of the first flow cavity 210 along the axial direction of the valve core 100 .

[0090] In one embodiment, a limit slot 140 is provided on the outer peripheral side of the valve core 100 and is arranged around the valve core 100 axially. An assembly port 144 is provided on the end of the limit slot 140 that is away from the valve core 100. The first sealing portion 300 is sleeved in the limit slot 140 through the assembly port 144 and fits tightly with the inner wall of the limit slot 140.

[0091] Further, in one embodiment, the width of the radial cross section of the limiting groove 140 along the axial direction of the valve core 100 is equal to the width of the assembly port 144 along the axial direction of the valve core 100, and the width of the radial cross section of the limiting groove 140 along the axial direction of the valve core 100 is smaller than the width of the first sealing portion 300 along the radial direction of the valve core 100. The maximum width of the first sealing portion 300 in the limiting groove 140 along the axial direction of the valve core 100 is smaller than the width of the first sealing portion 300 along the radial direction of the valve core 100. Such a configuration can ensure the fixing stability of the first sealing portion 300 and prevent the first sealing portion 300 from being deformed and falling off under the action of the fluid pressure difference.

[0092] 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 100 .

[0093] Specifically, the cross section of the limiting slot 140 is rectangular or elliptical.

[0094] Correspondingly, the radial cross section of the first sealing portion 300 is rectangular or elliptical.

[0095] Such configuration can reduce the difficulty of installing the first sealing portion 300 .

[0096] In one embodiment, the first sealing portion 300 includes a main body 620 and a sealing head 630. The first sealing portion 300 is clamped in the limit 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 limit slot 140 through the assembly port 144 and is movably sealed with the inner wall of the first circulation cavity 210. The width of the sealing head 630 along the axial direction of the valve core 100 is smaller than the width of the main body 620 along the axial direction of the valve core 100.

[0097] Such a configuration can reduce the contact area between the first sealing portion 300 and the inner wall of the first circulation cavity 210 , thereby increasing the contact pressure between the first sealing portion 300 and the inner wall of the first circulation cavity 210 , thereby improving the sealing effect of the first sealing portion 300 .

[0098] 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 100, and the assembly port 144 is arranged at one end of the first groove 142 away from the axis of the valve core 100, 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 along the axial direction of the valve core 100; the first sealing portion 300 includes a first portion 640 and a second portion 650, the first portion 640 is clamped in the first groove 142, and the second portion 650 is clamped in the second groove 143.

[0099] Furthermore, the axial length of the second groove 143 along the valve core 100 is greater than the axial length of the first groove 142 along the valve core 100 ; the axial length of the second portion 650 along the valve core 100 is greater than the axial length of the first groove 142 along the valve core 100 .

[0100] In this way, the radial cross section of the limiting groove 140 formed by the communication between the first groove 142 and the second groove 143 is L-shaped.

[0101] Correspondingly, the radial cross section of the first sealing portion 300 is L-shaped.

[0102] Such a configuration further improves the clamping strength between the first sealing portion 300 and the limiting slot 140 , making it difficult for the first sealing portion 300 to escape from the limiting slot 140 .

[0103] Alternatively, the axial length of the second groove 143 along the valve core 100 is equal to the axial length of the first groove 142 along the valve core 100, and the inner wall of the second groove 143 has a protrusion along the axial direction of the valve core 100, and at least part of the protrusion penetrates into the second portion 650. Such an arrangement can ensure the fixed stability of the first sealing portion 300 and prevent the first sealing portion 300 from deforming and falling off under the action of the fluid pressure difference. In one embodiment, the number of the second sealing portions 400 is two, and each second sealing portion 400 is movably sealed with the inner wall of the valve core 100, one of the second sealing portions 400 is sealed with the third valve port 213, and the other second sealing portion 400 is sealed with the fourth valve port 214; the valve core 100 has a retaining groove 150 for installing two second sealing portions 400 respectively.

[0104] The present application also provides an air-conditioning system, which includes the valve device described in any one of the above embodiments, and the valve device includes but is not limited to an electronic reversing valve, a solenoid valve or a multi-way valve.

[0105] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0106] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

[0107] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0108] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0109] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0110] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0111] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0112] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein 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 herein includes any and all combinations of one or more of the related listed items.

Claims

1. A valve device, characterized in that: The valve core (100) comprises a valve seat (200), wherein the valve seat (200) is provided with a first circulation cavity (210), the valve core (100) is movably arranged in the first circulation cavity (210), the outer peripheral side of the valve core (100) is sleeved with a first sealing portion (300) and a second sealing portion (400) arranged along the axial direction thereof at intervals, the first circulation cavity (210) is provided with a first valve port (211), a second valve port (212), a third valve port (213) and a fourth valve port (214) arranged in sequence along the axial direction of the valve core (100), the valve core (100) is provided with a second circulation cavity (110), and the two ends of the second circulation cavity (110) are provided with a first communication port (120) and a second communication port (130) which can be respectively connected to the first circulation cavity (210); When the valve core (100) is in a first sealing position, the first sealing portion (300) seals the first valve port (211) and opens the second valve port (212), and the second sealing portion (400) seals the third valve port (213) and opens the fourth valve port (214); when the valve core (100) is in a second sealing position, the first sealing portion (300) seals the second valve port (212) and opens the first valve port (211), and the second sealing portion (400) seals the fourth valve port (214) and opens the third valve port (213); When the distance that the valve core (100) moves from the second sealing position to the first sealing position is less than the second preset distance, the third valve port (213) and the fourth valve port (214) are both in an open state, the second valve port (212) is in a sealed state, the first valve port (211) is in an open state, and the first circulation cavity (210) on the side of the first sealing portion (300) facing away from the second sealing portion (400) is connected to the first circulation cavity (210) on the side of the first sealing portion (300) facing the second sealing portion (400); The hardness of the second sealing portion (400) is greater than the hardness of the first sealing portion (300).

2. The valve device according to claim 1, characterized in that When the distance the valve core (100) moves from the second sealing position to the first sealing position is a second preset distance, the second valve port (212) moves from a sealed state to a just-opened state, and the third valve port (213), the fourth valve port (214), and the first valve port (211) are all in an open state.

3. The valve device according to claim 2, characterized in that When the distance that the valve core (100) moves from the first sealing position to the second sealing position is less than the first preset distance, the third valve port (213) and the fourth valve port (214) are both in an open state, the first valve port (211) is in a sealed state, the second valve port (212) is in an open state, and the second valve port (212) can sequentially connect the third valve port (213) and the fourth valve port (214); the first circulation cavity (210) on the side of the first sealing portion (300) facing away from the second sealing portion (400) is connected to the first circulation cavity (210) on the side of the first sealing portion (300) facing the second sealing portion (400).

4. The valve device according to claim 3, characterized in that When the distance the valve core (100) moves from the first sealing position to the second sealing position is a first preset distance, the first valve port (211) moves from a sealed state to a just-opened state, and the third valve port (213), the fourth valve port (214), and the second valve port (212) are all in an open state.

5. The valve device according to claim 1, characterized in that The first sealing portion (300) and the inner wall of the first circulation cavity (210) are sealably matched along the axial direction of the valve core (100).

6. The valve device according to claim 3, characterized in that The first sealing portion (300) comprises a first sealing ring (310) and a second sealing ring (320), wherein the first sealing ring (310) and the second sealing ring (320) are arranged at intervals along the axial direction of the valve core (100); When the distance that the valve core (100) moves from the second sealing position to the first sealing position is less than a second preset distance, the second sealing ring (320) and the inner wall of the first circulation chamber (210) are sealed and matched to close the second valve port (212); When the distance that the valve core (100) moves from the first sealing position to the second sealing position is less than a first preset distance, the first sealing ring (310) and the inner wall of the first circulation chamber (210) are sealed and matched to close the first valve port (211).

7. The valve device according to claim 6, characterized in that When the distance that the valve core (100) moves from the second sealing position to the first sealing position is a second preset distance, the first sealing ring (310) and the first valve port (211) are in a non-closed state, the second valve port (212) and the second sealing ring (320) are in a non-closed state, and the third valve port (213) and the fourth valve port (214) are both in an open state; When the distance that the valve core (100) moves from the first sealing position to the second sealing position is a first preset distance, the first sealing ring (310) and the first valve port (211) are in a non-closed state, the second valve port (212) and the second sealing ring (320) are in a non-closed state, and the third valve port (213) and the fourth valve port (214) are both in an open state.

8. The valve device according to claim 1, characterized in that The radial dimension of the second sealing portion (400) along the valve core (100) is greater than the radial dimension of the third valve port (213) along the valve core (100), and the radial dimension of the second sealing portion (400) along the valve core (100) is greater than the radial dimension of the fourth valve port (214) along the valve core (100); the second sealing portion (400) and the third valve port (213) are matched in a position-limiting seal, and the second sealing portion (400) and the fourth valve port (214) are matched in a position-limiting seal.

9. The valve device according to claim 1, characterized in that The outer peripheral side of the valve core (100) is provided with a limit groove (140) arranged around the valve core (100) itself in an axial direction, and the end of the limit groove (140) facing away from the valve core (100) is provided with an assembly opening (144), and the first sealing portion (300) is sleeved in the limit groove (140) through the assembly opening (144) and is tightly fitted with the inner wall of the limit groove (140).

10. The valve device according to claim 9, characterized in that The width of the radial cross section of the limiting groove (140) along the axial direction of the valve core (100) is equal to the width of the assembly opening (144) along the axial direction of the valve core (100); the width of the radial cross section of the limiting groove (140) along the axial direction of the valve core (100) is smaller than its own width along the radial direction of the valve core (100); the maximum width of the first sealing portion (300) in the limiting groove (140) along the axial direction of the valve core (100) is smaller than its own width along the radial direction of the valve core (100).

11. The valve device according to claim 10, characterized in that The first sealing portion (300) includes a main body (620) and a sealing head (630), wherein the first sealing portion (300) is clamped to the limiting groove (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 groove (140) through the assembly port (144) and is movably sealed with the inner wall of the first circulation cavity (210), and the width of the sealing head (630) along the axial direction of the valve core (100) is smaller than the width of the main body (620) along the axial direction of the valve core (100).

12. The valve device according to claim 9, characterized in that The limit groove (140) comprises a first groove (142) and a second groove (143), the first groove (142) extending radially along the valve core (100), and the assembly port (144) is arranged at an end of the first groove (142) away from the axis of the valve core (100), one end of the second groove (143) is connected to an end of the first groove (142) away from the assembly port (144), and the other end extends along the axial direction of the valve core (100); the first sealing portion (300) comprises a first portion (640) and a second portion (650), the first portion (640) is clamped to the first groove (142), and the second portion (650) is clamped to the second groove (143); The axial length of the second groove (143) along the valve core (100) is greater than the axial length of the first groove (142) along the valve core (100); the axial length of the second portion (650) along the valve core (100) is greater than the axial length of the first groove (142) along the valve core (100); Alternatively, the axial length of the second groove (143) along the valve core (100) is equal to the axial length of the first groove (142) along the valve core (100), and the inner wall of the second groove (143) has a protrusion along the axial direction of the valve core (100), and at least part of the protrusion extends deep into the second part (650).

13. The valve device according to claim 1, characterized in that The number of the second sealing parts (400) is two, and each of the second sealing parts (400) is movably sealed with the inner wall of the valve core (100), one of the second sealing parts (400) is sealed with the third valve port (213), and the other second sealing part (400) is sealed with the fourth valve port (214); the valve core (100) has retaining grooves (150) for respectively mounting the two second sealing parts (400).

14. The valve device according to claim 1, characterized in that The second sealing part (400) is a plastic part, and the first sealing part (300) is a rubber part.

15. The valve device according to claim 1, characterized in that The first communication port (120) is arranged on a side wall of the valve core (100), and the second communication port (130) is arranged on an end portion of the valve core (100).

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