Valve and vehicle comprising same

Abstract

Provided is a vehicle (200). The vehicle (200) comprises a valve (100). The valve (100) comprises a valve body (10), a valve port assembly (20), and a valve needle assembly (30). A valve cavity (11) is defined in the valve body (10), and first valve ports (12) and a second valve port (13) are formed on the valve body (10). The valve port assembly (20) is movably disposed in the valve cavity (11) to open and close the second valve port (13). Third valve ports (221) and a fourth valve port (222) are formed on the valve port assembly (20), and the third valve ports (221) are communicated with the first valve ports (12).

Description

Valve and vehicle having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202323269940.4, entitled “Valve and vehicle having the same”, filed with the State Intellectual Property Office of China on November 30, 2023, the Chinese patent application with application number 202323273619.3, entitled “Valve and vehicle having the same”, filed with the State Intellectual Property Office of China on November 30, 2023, and the Chinese patent application with application number 202311634121.7, entitled “Valve and vehicle”, filed with the State Intellectual Property Office of China on November 30, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of valve technology, and in particular to a valve and a vehicle having the same. Background Art

[0004] In related technologies, needle-type electronic expansion valves are typically used in low-flow conditions. However, in vehicle heat pump systems, both high-flow and low-flow conditions may exist simultaneously. In these situations, needle-type electronic expansion valves alone cannot meet the requirements. High-flow conditions can damage the electronic expansion valve, shortening its service life and resulting in poor applicability.

[0005] Public content

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present application is to provide a valve that can realize the controllability of opening and closing the valve, and can meet different flow conditions and realize flow regulation.

[0007] A second object of the present application is to provide a vehicle comprising the valve described above.

[0008] According to an embodiment of the first aspect of the present application, a valve includes: a valve body assembly, wherein a valve cavity is defined within the valve body assembly, and a first valve port and a second valve port are formed on the valve body assembly; a valve needle assembly, wherein the valve needle assembly is movably disposed within the valve cavity to open and close the second valve port, and the valve needle assembly normally closes the second valve port; and a valve needle pressure relief device, wherein the valve needle pressure relief device is disposed on the valve needle assembly, and when the pressure at the second valve port reaches a predetermined pressure, the valve needle pressure relief device opens to connect the second valve port with the outside of the valve body assembly.

[0009] In valves according to some embodiments of the first aspect of the present application, a needle pressure relief device is provided on the needle assembly. When the needle pressure relief device is opened, the second valve port communicates with the exterior of the valve body assembly. Thus, compared to conventional valves, the needle pressure relief device enables the valve to fully relieve pressure, protecting the needle assembly from damage during operation and extending the service life of the valve. Furthermore, the valve can be adapted for both low-flow and high-flow operating conditions, thereby improving the valve's applicability.

[0010] According to some embodiments of the first aspect of the present application, the valve needle pressure relief device is a one-way pressure relief device, and the valve needle pressure relief device is configured to allow the fluid at the second valve port to flow unidirectionally to the outside of the valve body assembly.

[0011] According to some embodiments of the first aspect of the present application, a valve needle pressure relief channel is formed on the valve needle assembly, and the valve needle pressure relief device is arranged at the valve needle pressure relief channel. When the pressure at the second valve port reaches the predetermined pressure, the valve needle pressure relief device opens the valve needle pressure relief channel to allow the second valve port to communicate with the outside of the valve body assembly through the valve needle pressure relief channel.

[0012] According to some embodiments of the first aspect of the present application, a valve needle chamber is defined in the valve needle assembly, and the valve needle pressure relief device is arranged in the valve needle chamber; the valve needle pressure relief channel includes: a first pressure relief channel, one end of the first pressure relief channel is connected to the second valve port, and the valve needle pressure relief device normally closes the other end of the first pressure relief channel; and a second pressure relief channel, one end of the second pressure relief channel is connected to the valve needle chamber, and the other end of the second pressure relief channel is connected to the outside of the valve body assembly; when the pressure at the second valve port reaches the predetermined pressure, the valve needle pressure relief device opens the other end of the first pressure relief channel to allow the second valve port to be connected to the second pressure relief channel through the first pressure relief channel and the valve needle chamber.

[0013] According to some embodiments of the first aspect of the present application, the valve needle pressure relief device includes: a pressure relief shell, which is arranged at the other end of the first pressure relief channel, and a pressure relief chamber is defined in the pressure relief shell, and at least one pressure relief hole is formed on the pressure relief shell, and the pressure relief chamber is connected with the valve needle chamber through the pressure relief hole; and a pressure relief part, which is movably arranged in the pressure relief chamber to open and close the other end of the first pressure relief channel; when the pressure at the second valve port reaches the predetermined pressure, the pressure relief part opens the other end of the first pressure relief channel to connect the first pressure relief channel with the pressure relief chamber.

[0014] According to some embodiments of the first aspect of the present application, the valve needle pressure relief device further includes: an elastic member, wherein the elastic member is stopped between the pressure relief housing and the pressure relief portion.

[0015] According to some embodiments of the first aspect of the present application, an opening is formed on the pressure relief shell, the opening is connected to the pressure relief chamber, and a guide portion extending toward the first pressure relief channel is provided at the opening; the pressure relief portion includes: a first pressure relief section, which is provided at the opening; and a second pressure relief section, which is connected to one end of the first pressure relief section adjacent to the first pressure relief channel, and the second pressure relief section is suitable for opening and closing the other end of the first pressure relief channel, and the two ends of the elastic member are respectively sleeved on the outer peripheral sides of the guide portion and the second pressure relief section.

[0016] According to some embodiments of the first aspect of the present application, an end of the second pressure relief section adjacent to the first pressure relief channel is provided with an extension portion extending radially outward, and the elastic member is stopped between the extension portion and the inner wall of the pressure relief chamber on the side where the opening is located.

[0017] According to some embodiments of the first aspect of the present application, the pressure relief part further includes: a third pressure relief section, the third pressure relief section is connected to an end of the first pressure relief section away from the second pressure relief section, the outer sleeve of the third pressure relief section is provided with a limit member, the limit member is located on a side of the pressure relief housing away from the first pressure relief channel, and the limit member is suitable for abutting against the pressure relief housing.

[0018] According to some embodiments of the first aspect of the present application, the first pressure relief channel includes a first pressure relief channel section and a second pressure relief channel section connected to each other, one end of the first pressure relief channel section is connected to the second valve port, one end of the second pressure relief channel section is connected to an end of the first pressure relief channel section away from the second valve port, the valve needle pressure relief device normally closes the other end of the second pressure relief channel section, and the cross-sectional area of ​​the second pressure relief channel section is larger than the cross-sectional area of ​​the first pressure relief channel section.

[0019] According to some embodiments of the first aspect of the present application, the valve needle assembly includes: a valve needle body, the valve needle body including a valve needle cylinder and a valve needle, the valve needle is arranged at one end of the valve needle cylinder adjacent to the second valve port, the valve needle and the valve needle cylinder jointly define the valve needle chamber, and the first pressure relief channel is formed on the valve needle; and a driving member, the driving member is arranged at one end of the valve needle cylinder away from the second valve port, the driving member is suitable for driving the valve needle body to open and close the second valve port, and the second pressure relief channel is formed on the driving member.

[0020] According to some embodiments of the first aspect of the present application, the valve body assembly includes: a valve body, on which the first valve port and the first sub-valve port are formed; and a valve port assembly, which is movably arranged in the valve body, and the valve cavity is defined in the valve port assembly, and a connecting valve port and a second sub-valve port are formed on the valve port assembly, the connecting valve port is connected to the first valve port, the first sub-valve port and the second sub-valve port together constitute the second valve port, one end of the second sub-valve port is connected to the second sub-valve port, and the valve needle assembly is suitable for opening and closing the other end of the second sub-valve port.

[0021] According to some embodiments of the first aspect of the present application, the valve body assembly further includes a second elastic member, which is stopped between the inner wall of the valve body and the valve port assembly.

[0022] According to an embodiment of the second aspect of the present application, a valve includes: a valve body, a valve cavity is defined in the valve body, a first valve port and a second valve port are formed on the valve body; a valve port assembly, the valve port assembly is movably arranged in the valve cavity to open and close the second valve port, a third valve port and a fourth valve port are formed on the valve port assembly, the third valve port is communicated with the first valve port, when the valve port assembly opens the second valve port, the first valve port is communicated with the second valve port through the valve cavity and the fluid is suitable for bidirectional circulation between the first valve port and the second valve port; and a valve needle assembly, the valve needle assembly is movably arranged in the valve port assembly to open and close the fourth valve port, when the valve needle assembly opens the fourth valve port, the first valve port is communicated with the second valve port through the third valve port and the fourth valve port and the fluid is suitable for bidirectional circulation between the first valve port and the second valve port.

[0023] According to the valve described in some embodiments of the second aspect of the present application, the setting of the valve port assembly can control the opening and closing of the second valve port of the valve body, and the setting of the valve needle assembly can control the opening and closing of the fourth valve port of the valve port assembly. When the fluid flowing through the valve body is in a large flow condition, the valve port assembly opens the second valve port, and the fluid is suitable for two-way circulation between the second valve port and the first valve port. When the fluid flowing through the valve body is in a small flow condition, the valve port assembly closes the second valve port, and the valve needle assembly opens the fourth valve port, and the fluid is suitable for circulation between the second valve port, the fourth valve port, the third valve port and the first valve port. By moving the valve needle assembly to adjust the opening degree of the fourth valve port, flow regulation under small flow conditions can be further achieved, and both the switch valve and the flow can be controlled, thereby improving the practicality of the valve.

[0024] According to some embodiments of the second aspect of the present application, the cross-sectional area of ​​the fourth valve port is different from that of the second valve port. When the valve needle assembly moves in a direction away from the second valve port, the valve needle assembly is suitable for driving the valve port assembly to open the second valve port.

[0025] According to some embodiments of the second aspect of the present application, it further includes: a pressure relief device, which is configured to open when the pressure at the second valve port reaches a predetermined pressure to connect the second valve port with the first valve port or the second valve port with the outside of the valve body.

[0026] According to some embodiments of the second aspect of the present application, the pressure relief device includes: a valve port pressure relief device, which is arranged on the valve port assembly. When the pressure at the second valve port reaches a predetermined pressure, the valve port pressure relief device opens to allow the second valve port to be connected to the first valve port through the third valve port.

[0027] According to some embodiments of the second aspect of the present application, a valve port pressure relief channel is formed on the valve port assembly, and the valve port pressure relief device is arranged at the valve port pressure relief channel. When the pressure at the second valve port reaches the predetermined pressure, the valve port pressure relief device opens the valve port pressure relief channel to enable the second valve port to be connected to the third valve port through the valve port pressure relief channel.

[0028] According to some embodiments of the second aspect of the present application, the valve port pressure relief channel includes a first valve port channel section and a second valve port channel section, the first valve port channel section is connected to the second valve port, and the second valve port channel section is connected to the side of the first valve port channel section away from the second valve port; the valve port pressure relief device includes: a pressure relief seat, the pressure relief seat is arranged in the second valve port channel section, at least one connecting channel is formed on the pressure relief seat, and the second valve port channel section is connected to the third valve port through the connecting channel; and a pressure relief plug, the pressure relief plug is movably arranged on the pressure relief seat to open and close the connection between the first valve port channel section and the second valve port channel section.

[0029] According to some embodiments of the second aspect of the present application, the valve port pressure relief device further includes: a first elastic member, which is stopped between the pressure relief seat and the pressure relief plug.

[0030] According to some embodiments of the second aspect of the present application, the pressure relief device includes: a valve needle pressure relief device, which is arranged on the valve needle assembly. When the pressure at the second valve port reaches a predetermined pressure, the valve needle pressure relief device opens to connect the second valve port with the outside of the valve body.

[0031] According to some embodiments of the second aspect of the present application, a valve needle pressure relief channel is formed on the valve needle assembly, and the valve needle pressure relief device is arranged at the valve needle pressure relief channel. When the pressure at the second valve port reaches the predetermined pressure, the valve needle pressure relief device opens the valve needle pressure relief channel to allow the second valve port to be connected to the outside of the valve body through the valve needle pressure relief channel.

[0032] According to some embodiments of the second aspect of the present application, a valve needle chamber is defined in the valve needle assembly, and the valve needle pressure relief device is arranged in the valve needle chamber; the valve needle pressure relief channel includes a first pressure relief channel and a second pressure relief channel, one end of the first pressure relief channel is connected to the second valve port, and the valve needle pressure relief device is suitable for opening and closing the other end of the first pressure relief channel, one end of the second pressure relief channel is connected to the valve needle chamber, and the other end of the second pressure relief channel is connected to the outside of the valve body, when the pressure at the second valve port reaches the predetermined pressure, the valve needle pressure relief device opens the other end of the first pressure relief channel to allow the second valve port to communicate with the second pressure relief channel through the first pressure relief channel and the valve needle chamber.

[0033] According to some embodiments of the second aspect of the present application, the valve needle pressure relief device includes: a pressure relief shell, which is arranged at the other end of the first pressure relief channel, and a pressure relief chamber is defined in the pressure relief shell, and at least one pressure relief hole is formed on the pressure relief shell, and the pressure relief chamber is connected with the valve needle chamber through the pressure relief hole; a pressure relief part, which is movably arranged in the pressure relief chamber to open and close the other end of the first pressure relief channel; and an elastic member, which is stopped between the pressure relief shell and the pressure relief part; when the pressure at the second valve port reaches the predetermined pressure, the pressure relief part opens the other end of the first pressure relief channel to connect the first pressure relief channel with the pressure relief chamber.

[0034] According to some embodiments of the second aspect of the present application, the valve needle assembly includes: a valve needle body, the valve needle body including a valve needle cylinder and a valve needle, the valve needle is arranged at one end of the valve needle cylinder adjacent to the second valve port, the valve needle and the valve needle cylinder jointly define the valve needle chamber, and the first pressure relief channel is formed on the valve needle; and a driving member, the driving member is arranged at one end of the valve needle cylinder away from the second valve port, the driving member is suitable for driving the valve needle body to open and close the second valve port, and the second pressure relief channel is formed on the driving member.

[0035] According to some embodiments of the second aspect of the present application, the valve needle assembly is movable relative to the valve body along the axial direction of the valve body; the driving member is movably matched with the valve needle body, the driving member is rotatable relative to the valve needle body and movable along the axial direction of the valve body to drive the valve needle body to move relative to the valve body along the axial direction of the valve body, and the rotational friction between the driving member and the valve needle body is smaller than the rotational friction between the valve needle body and the valve body.

[0036] According to some embodiments of the second aspect of the present application, a friction reducing assembly is provided between the driving member and the valve needle assembly, and when the driving member rotates relative to the valve needle body, the valve needle body does not rotate relative to the valve body.

[0037] According to some embodiments of the second aspect of the present application, the valve further includes: a first elastic return member, which is stopped between the valve needle pressure relief device and the friction reducing component.

[0038] According to some embodiments of the second aspect of the present application, the friction reducing component is a bearing component.

[0039] According to some embodiments of the second aspect of the present application, the pressure relief device is a one-way valve.

[0040] According to some embodiments of the second aspect of the present application, the valve port assembly includes: a valve port body, which is arranged in the valve cavity, and the third valve port is formed on the valve port body; and a valve port seat, which is arranged at one end of the valve port body adjacent to the second valve port, and the fourth valve port is formed on the valve port seat, the valve port seat and the valve port body jointly define a valve cavity, one end of the valve needle assembly passes through an end of the valve port body away from the second valve port and is fitted in the valve cavity, and the valve port seat is suitable for opening and closing the second valve port.

[0041] According to some embodiments of the second aspect of the present application, there is a first step portion between the second valve port and the valve cavity, and the end surface of the valve port seat adjacent to one end of the second valve port can be detachably matched with the first step portion to open and close the second valve port.

[0042] According to some embodiments of the second aspect of the present application, a mating protrusion extending toward the valve port seat is provided on the first step portion; the valve port seat includes: a first valve port seat section, which is mated in the valve port body; and a second valve port seat section, which is connected to one end of the first valve port seat section adjacent to the second valve port, and the second valve port seat section is located on a side of the valve port body adjacent to the second valve port, and the second valve port seat section protrudes from the outer peripheral surface of the valve along the radial direction of the valve body, and an installation groove is formed on the end face of the second valve port seat section adjacent to the second valve port, and a sealing member is provided in the installation groove, and the sealing member is detachably mated with the mating protrusion.

[0043] According to some embodiments of the second aspect of the present application, the seal and the inner wall of the mounting groove jointly define a mounting cavity, the mounting cavity is located radially inward of the second valve port, and a valve port gasket is provided in the mounting cavity.

[0044] According to some embodiments of the second aspect of the present application, the valve includes a second elastic return member, which is sleeved outside the valve port body and stops between the valve port seat and the inner wall of the valve cavity.

[0045] According to an embodiment of the third aspect of the present application, a valve includes: a valve body, a valve cavity is defined in the valve body, a first valve port and a second valve port are formed on the valve body; a valve port assembly, the valve port assembly is movably arranged in the valve cavity to open and close the second valve port, the valve port assembly normally closes the second valve port, a third valve port and a fourth valve port are formed on the valve port assembly, the third valve port is connected to the first valve port; a valve needle assembly, the valve needle assembly is movable relative to the valve port assembly to open and close the fourth valve port, the valve needle assembly normally closes the fourth valve port; and a valve port pressure relief device, the valve port pressure relief device is arranged on the valve port assembly, and when the pressure at the second valve port reaches a predetermined pressure, the valve port pressure relief device opens to connect the second valve port with the third valve port.

[0046] In some embodiments of the third aspect of the present application, a valve port pressure relief device is provided on the second valve port. When the pressure at the second valve port reaches a predetermined pressure, the valve port pressure relief device opens, thereby connecting the second valve port with the third valve port. Thus, compared to conventional electronic expansion valves, the valve port pressure relief device protects the valve port assembly, preventing damage during operation and extending the service life of the valve. Furthermore, the valve is adaptable to both low-flow and high-flow operating conditions, thereby improving the valve's applicability.

[0047] According to some embodiments of the third aspect of the present application, the valve port pressure relief device is a one-way pressure relief device, and the valve port pressure relief device is configured to allow the fluid at the second valve port to flow unidirectionally to the third valve port.

[0048] According to some embodiments of the third aspect of the present application, a valve port pressure relief channel is formed on the valve port assembly, and the valve port pressure relief device is arranged at the valve port pressure relief channel. When the pressure at the second valve port reaches the predetermined pressure, the valve port pressure relief device opens the valve port pressure relief channel to allow the second valve port to be connected to the third valve port through the valve port pressure relief channel.

[0049] According to some embodiments of the third aspect of the present application, the valve port pressure relief channel includes: a first valve port channel section, which is connected to the second valve port; and a second valve port channel section, which is connected to the side of the first valve port channel section away from the second valve port, and the valve port pressure relief device is arranged in the second valve port channel section.

[0050] According to some embodiments of the third aspect of the present application, the valve port pressure relief device includes: a pressure relief seat, which is arranged in the second valve port channel section, and at least one connecting channel is formed on the pressure relief seat, and the second valve port channel section is connected with the third valve port through the connecting channel; and a pressure relief plug, which is movably arranged on the pressure relief seat to open and close the connection between the first valve port channel section and the second valve port channel section.

[0051] According to some embodiments of the third aspect of the present application, a matching hole is formed on the pressure relief plug; the pressure relief seat includes: a first pressure relief seat portion, the first pressure relief seat portion is arranged at one end of the second valve port channel section away from the first valve port channel section, and the connecting channel is formed on the first pressure relief seat portion; and a second pressure relief seat portion, one end of the second pressure relief seat portion is connected to the first pressure relief seat portion, and the other end of the second pressure relief seat portion extends toward the first valve port channel section, and the matching hole cooperates with the other end of the second pressure relief seat portion, so that the pressure relief plug can be moved along the second pressure relief seat portion to open and close the connection between the first valve port channel section and the second valve port channel section.

[0052] According to some embodiments of the third aspect of the present application, there are multiple communicating channels, and the multiple communicating channels are arranged at intervals along the circumference of the first pressure relief seat.

[0053] According to some embodiments of the third aspect of the present application, the valve port pressure relief device further includes: a first elastic member, the first elastic member being stopped between the first pressure relief seat and the pressure relief plug.

[0054] According to some embodiments of the third aspect of the present application, the outer surface of the pressure relief plug is formed into a spherical shape.

[0055] According to some embodiments of the third aspect of the present application, the valve further includes: a second elastic member, which is stopped between the inner wall of the valve cavity and the valve port assembly.

[0056] The vehicle according to the fourth embodiment of the present application includes the valves described in the first, second and third embodiments above.

[0057] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0059] FIG1 is a schematic diagram of a valve according to an embodiment of the first aspect of the present application.

[0060] FIG2 is a schematic diagram of a valve needle assembly according to an embodiment of the first aspect of the present application.

[0061] FIG3 is an enlarged view of the circled portion A in FIG2 .

[0062] FIG4 is a schematic diagram of a valve port assembly and a valve needle assembly according to an embodiment of the first aspect of the present application.

[0063] FIG5 is another schematic diagram of a valve according to an embodiment of the first aspect of the present application.

[0064] FIG6 is a schematic diagram of a valve according to an embodiment of the second aspect of the present application.

[0065] FIG7 is a schematic cross-sectional view of a valve according to an embodiment of the second aspect of the present application.

[0066] FIG8 is a schematic diagram of a valve body according to an embodiment of the second aspect of the present application.

[0067] FIG9 is a schematic cross-sectional view of a valve body according to an embodiment of the second aspect of the present application.

[0068] FIG10 is a schematic diagram of a valve body, a valve port assembly and a valve needle assembly according to an embodiment of the second aspect of the present application.

[0069] Figure 11 is a cross-sectional schematic diagram of the valve body, valve port assembly and valve needle assembly according to the embodiment of the second aspect of the present application.

[0070] Figure 12 is a cross-sectional schematic diagram of the valve body and valve port assembly according to the embodiment of the second aspect of the present application.

[0071] FIG13 is an enlarged schematic diagram of the P region in FIG12 .

[0072] FIG14 is a schematic diagram of a valve needle assembly according to an embodiment of the second aspect of the present application.

[0073] Figure 15 is a cross-sectional schematic diagram of the valve needle assembly according to the embodiment of the second aspect of the present application.

[0074] FIG16 is an enlarged schematic diagram of the Q region in FIG15 .

[0075] FIG17 is a cross-sectional view of a valve according to an embodiment of the third aspect of the present application;

[0076] FIG18 is a schematic diagram of a valve port assembly according to an embodiment of the third aspect of the present application;

[0077] FIG19 is an enlarged view of the circled portion A in FIG18 ;

[0078] FIG20 is a schematic diagram of a valve port assembly and a valve needle assembly according to an embodiment of the third aspect of the present application;

[0079] Figure 21 is a schematic diagram of a valve according to an embodiment of the third aspect of the present application.

[0080] Figure 22 is a schematic block diagram of a vehicle according to an embodiment of the fourth aspect of the present application.

[0081] FIGURES: 200, vehicle; 100, valve; 1, valve body assembly; 10, valve body; 11, valve chamber; 12, first valve port; 1211, first sub-valve port; 13, second valve port; 131, connecting valve port; 132, second sub-valve port; 14, first step; 141, mating protrusion; 20, valve port assembly; 21, valve port pressure relief passage; 211, first valve port channel section; 212, second valve port channel section; 213, second step; 22, valve port body; 221, third valve port; 222, fourth valve port; 23, valve port seat; 231, first valve port seat section; 232, second valve port seat section; 233, mounting groove; 234, sealing member; 235, valve port gasket; 24, valve cavity; 25, second elastic return member; 30. Valve needle assembly; 31. Valve needle pressure relief channel; 311. First pressure relief channel; 312. Second pressure relief channel; 3111. First pressure relief channel section; 3112. Second pressure relief channel section; 3121. First sub-pressure relief channel; 3122. Second sub-pressure relief channel; 32. Valve needle body; 321. Valve needle cylinder; 322. Valve needle; 33. Driving member; 34. Friction reducing assembly; 35. First elastic return member; 36. Valve needle chamber; 37. Second communicating channel; 371. First communicating channel section; 372. Second communicating channel section; 40. Pressure relief device; 41. Valve port pressure relief device; 411. Pressure relief seat; 4111. Connecting channel; 4112. First pressure relief seat portion; 4113. Second pressure relief seat portion; 412. Pressure relief plug; 4121. First pressure relief section; 4122. Second pressure relief section; 4123. Extension portion; 4124. Third pressure relief section; 4125. Limiting member; 413. First elastic member; 414. Matching hole; 42. Valve needle pressure relief device; 421. Pressure relief housing; 4211. Pressure relief hole; 4212. Pressure relief chamber; 4213. Opening; 4214. Guide portion; 422. Pressure relief portion; 423. Elastic member; 43. Second elastic member. DETAILED DESCRIPTION

[0082] The following describes in detail embodiments of the present application, and the embodiments described with reference to the accompanying drawings are exemplary.

[0083] The valve 100 according to the embodiment of the first aspect of the present application, as shown in Figures 1 to 5, includes a valve body assembly 1, a valve needle assembly 30 and a valve needle pressure relief device 42.

[0084] Specifically, the valve body assembly 1 defines a valve cavity 11, and is formed with a first valve port 12 and a second valve port 13. A valve needle assembly 30 is movably disposed within the valve cavity 11 to open and close the second valve port 13. The valve needle assembly 30 normally closes the second valve port 13. A valve needle pressure relief device 42 is disposed on the valve needle assembly 30. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve needle pressure relief device 42 opens, allowing the second valve port 13 to communicate with the exterior of the valve body assembly 1. For example, in the example of Figures 1-5 , the first valve port 12 is formed on the sidewall of the valve body assembly 1. There are multiple first valve ports 12, which are spaced apart along the circumference of the valve body assembly 1. The second valve port 13 is formed at the bottom of the valve body assembly 1. The valve needle assembly 30 is disposed within the valve cavity 11 and is movable along the height direction of the valve cavity 11 (e.g., the vertical direction in Figure 1 ). The valve needle assembly 30 usually cooperates with the second valve port 13 to keep the second valve port 13 in a closed state. When the valve needle assembly 30 moves upward, the second valve port 13 opens. The valve needle pressure relief device 42 is arranged inside the valve needle assembly 30. If the pressure at the second valve port 13 reaches a predetermined pressure, that is, when the upward pressure on the second valve port 13 is much greater than the pressure exerted by the valve needle assembly 30 on the second valve port 13, the valve needle pressure relief device 42 is opened, and the fluid is transferred to the first valve port 12 through the second valve port 13, and flows from the first valve port 12 to the outside of the valve body assembly 1, thereby achieving pressure relief. At the same time, the instantaneous pressure at the second valve port 13 is reduced, allowing the valve needle assembly 30 to move upward normally without damaging the valve needle assembly 30.

[0085] When the valve 100 is used in a vehicle heat pump system, fluid can flow into the valve 100 from the bottom and out from the sidewall of the valve 100. That is, the fluid enters the valve cavity 11 from the second valve port 13 and then exits from the first valve port 12. When the pressure of the fluid flowing into the second valve port 13 is relatively high, the pressure on the second valve port 13 is relatively high after the fluid reaches the second valve port 13. At this time, the instantaneous pressure at the second valve port 13 is too high. If this pressure is not relieved, it will directly and quickly push the valve needle assembly 30 upward, causing the valve needle assembly 30 to be unable to return to the position closing the second valve port 13, thereby damaging the valve needle assembly 30. Therefore, when the pressure at the second valve port 13 reaches a predetermined pressure, the valve needle pressure relief device 42 is first opened, allowing part of the fluid at the second valve port 13 to flow through the second valve port 13 to the valve needle pressure relief device 42, and then flow from the valve needle pressure relief device 42 to the outside of the valve body assembly 1, thereby reducing the instantaneous pressure at the second valve port 13 and achieving pressure relief. At the same time, the residual pressure continues to push the valve needle assembly 30 upward, increasing the distance between the valve needle assembly 30 and the second valve port 13. The fluid is now divided into two parts: one part flows out of the valve body assembly 1 through the second valve port 13 and the valve needle pressure relief device 42, while the other part flows out of the valve body assembly 1 through the second valve port 13 and the first valve port 12. It should be noted that if the pressure at the second valve port 13 does not reach the predetermined pressure, the fluid can also flow through the second valve port 13 and be discharged from the first valve port 12. In this case, the valve needle pressure relief device 42 is closed.

[0086] When valve 100 is used in a vehicle's heat pump system, fluid can also flow out of the bottom of valve 100, that is, the fluid enters valve cavity 11 from first valve port 12 and then exits from second valve port 13. When fluid with lower pressure enters valve cavity 11 from first valve port 12, valve needle assembly 30 moves upward to open second valve port 13, allowing fluid to flow out of valve body assembly 1 from second valve port 13. Valve needle assembly 30 has a balancing hole. During this process, the balancing hole on valve needle assembly 30 balances the pressure inside and outside valve body assembly 1, allowing fluid to flow unimpeded within valve cavity 11, thereby allowing fluid to enter valve cavity 11 smoothly from first valve port 12 and exit valve body assembly 1 smoothly from second valve port 13. Thus, valve needle pressure relief device 42 can relieve pressure from valve 100 and protect valve needle assembly 30, preventing damage to valve needle assembly 30 during operation and extending the service life of valve 100.

[0087] According to the valve 100 of the first embodiment of the present application, a valve needle pressure relief device 42 is provided on the valve needle assembly 30. When the valve needle pressure relief device 42 is opened, the second valve port 13 communicates with the exterior of the valve body assembly 1. Thus, compared to conventional electronic expansion valves, the valve needle pressure relief device 42 enables the valve 100 to completely relieve pressure, protecting the valve needle assembly 30 from damage during operation, thereby extending the service life of the valve 100. Furthermore, the valve 100 is applicable to both low-flow and high-flow operating conditions, thereby improving the applicability of the valve 100.

[0088] According to some embodiments of the first aspect of the present application, the valve needle pressure relief device 42 is a one-way pressure relief device, and the valve needle pressure relief device 42 is configured to allow the fluid at the second valve port 13 to flow unidirectionally to the outside of the valve body assembly 1. Referring to Figures 1 to 3, one end of the valve needle pressure relief device 42 is connected to the second valve port 13, and the other end of the valve needle assembly 30 is connected to the outside of the valve body assembly 1. When the second valve port 13 is depressurized, the fluid flowing through the second valve port 13 can only flow to the outside of the valve body assembly 1 through the valve needle pressure relief device 42, and the fluid cannot flow from the outside of the valve body assembly 1 to the second valve port 13, that is, the valve needle pressure relief device 42 is a one-way valve. This arrangement can prevent the fluid from flowing back after the valve 100 is opened, ensure the normal operation of the valve 100, and enhance the safety of the valve 100.

[0089] According to some embodiments of the present application, as shown in Figures 1-5 , a needle pressure relief channel 31 is formed on the needle assembly 30, and a needle pressure relief device 42 is disposed at the needle pressure relief channel 31. When the pressure at the second valve port 13 reaches a predetermined pressure, the needle pressure relief device 42 opens the needle pressure relief channel 31, allowing the second valve port 13 to communicate with the exterior of the valve body assembly 1 through the needle pressure relief channel 31. As shown in Figures 1-3 , the needle pressure relief channel 31 is formed within the needle assembly 30 and extends along the height of the needle assembly 30. The needle pressure relief device 42 abuts against the needle pressure relief channel 31 at the needle pressure relief channel 31, thereby keeping the needle pressure relief channel 31 normally closed. When the pressure at the second valve port 13 reaches a predetermined pressure, the needle pressure relief device 42 moves upward to open the needle pressure relief channel 31, allowing some fluid to be discharged from the needle pressure relief channel 31 to the exterior of the valve body assembly 1, completing the pressure relief. With such an arrangement, the valve 100 has a separate valve needle pressure relief channel 31 , which prevents the valve needle assembly 30 from being damaged by instantaneous pressure and improves the efficiency of pressure relief.

[0090] Furthermore, as shown in Figures 1 to 5, a valve needle chamber 36 is defined in the valve needle assembly 30, and a valve needle pressure relief device 42 is provided in the valve needle chamber 36. The valve needle pressure relief channel 31 includes a first pressure relief channel 311 and a second pressure relief channel 312. One end of the first pressure relief channel 311 is connected to the second valve port 13, and the valve needle pressure relief device 42 normally closes the other end of the first pressure relief channel 311. One end of the second pressure relief channel 312 is connected to the valve needle chamber 36, and the other end of the second pressure relief channel 312 is connected to the outside of the valve body assembly 1. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve needle pressure relief device 42 opens the above-mentioned other end of the first pressure relief channel 311, so that the second valve port 13 is connected to the second pressure relief channel 312 through the first pressure relief channel 311 and the valve needle chamber 36.

[0091] 1 and 2 , the valve needle chamber 36 is formed inside the valve needle assembly 30, and the valve needle pressure relief device 42 can move along the height direction of the valve needle chamber 36. The first pressure relief channel 311 and the second pressure relief channel 312 extend along the height direction of the valve needle chamber 36, respectively, and the first pressure relief channel 311 is located below the second pressure relief channel 312. The valve needle pressure relief device 42 usually abuts against one end of the first pressure relief channel 311 adjacent to the second pressure relief channel 312, so that the first pressure relief channel 311 is normally closed. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve needle pressure relief device 42 moves upward to open the first pressure relief channel 311, so that the fluid at the second valve port 13 can pass through the first pressure relief channel 311 and reach the outside of the valve body assembly 1 through the first pressure relief channel 311 and the second pressure relief channel 312, completing the pressure relief at the second valve port 13 and allowing the valve needle assembly 30 to continue working. As a result, the valve needle pressure relief device 42 is facilitated to open and close the valve needle pressure relief channel 31, the pressure relief is completed smoothly, and the working efficiency is improved.

[0092] According to some embodiments of the present application, as shown in Figures 1-5 , the valve needle pressure relief device 42 includes a pressure relief housing 421 and a pressure relief portion 422. The pressure relief portion 422 is, for example, a pressure relief plug. The pressure relief housing 421 is disposed at the other end of the first pressure relief passage 311. The pressure relief housing 421 defines a pressure relief chamber 4212. The pressure relief housing 421 is formed with at least one pressure relief hole 4211, which communicates with the valve needle chamber 36 through the pressure relief hole 4211. The pressure relief portion 422 is movably disposed within the pressure relief chamber 4212 to open and close the other end of the first pressure relief passage 311. When the pressure at the second valve port 13 reaches a predetermined pressure, the pressure relief portion 422 opens the other end of the first pressure relief passage 311, connecting the first pressure relief passage 311 with the pressure relief chamber 4212. For example, in the example of Figure 3 , the pressure relief housing 421 is disposed at the end of the first pressure relief passage 311 away from the second valve port 13. A pressure relief chamber 4212 is formed inside the pressure relief shell 421, and a pressure relief hole 4211 is formed on the side wall of the pressure relief shell 421. The pressure relief portion 422 is arranged inside the pressure relief chamber 4212. The pressure relief portion 422 can move along the height direction of the pressure relief chamber 4212, so that the pressure relief portion 422 can open or close the other end of the first pressure relief channel 311. When the pressure at the second valve port 13 reaches a predetermined pressure, the instantaneous pressure is transmitted to the pressure relief portion 422 through the first pressure relief channel 311, so that the pressure relief portion 422 moves upward after being subjected to upward pressure, and opens the first pressure relief channel 311, so that the fluid at the second valve port 13 can pass through the first pressure relief channel 311, and then pass through the second pressure relief channel 312, and then be transmitted to the outside of the valve body assembly 1, thereby completing the pressure relief at the second valve port 13. Such a configuration facilitates the opening and closing of the first pressure relief channel 311 by the pressure relief portion 422 , so that the pressure relief portion 422 can quickly open the first pressure relief channel 311 and smoothly complete the pressure relief, thereby improving work efficiency.

[0093] According to some embodiments of the first aspect of the present application, as shown in Figures 1 to 5, the valve needle pressure relief device 42 further includes an elastic member 423, and the elastic member 423 abuts between the pressure relief housing 421 and the pressure relief portion 422. As shown in Figure 3, the elastic member 423 is sleeved on the outer periphery of the pressure relief portion 422. When the pressure relief portion 422 is subjected to pressure and moves upward, the elastic member 423 is compressed and deformed after being subjected to the pressure of the pressure relief portion 422, causing the first pressure relief channel 311 to open and complete the pressure relief. Subsequently, when the pressure on the pressure relief portion 422 disappears, the compression on the elastic member 423 also disappears, and the elastic member 423 begins to restore its elastic deformation, causing the pressure relief portion 422 to move toward the first pressure relief channel 311 until the pressure relief portion 422 abuts against the first pressure relief channel 311, thereby completing the recovery of the elastic member 423's elastic deformation. As a result, the valve needle pressure relief device 42 can smoothly open the first pressure relief channel 311 and can close the first pressure relief channel 311 after the pressure relief is completed, thereby improving work efficiency.

[0094] According to some embodiments of the first aspect of the present application, as shown in Figures 1-5, an opening 4213 is formed on the pressure relief housing 421, which is connected to the pressure relief chamber 4212. A guide portion 4214 extending toward the first pressure relief channel 311 is provided at the opening 4213. The pressure relief portion 422 includes a first pressure relief section 4121 (e.g., a first pressure relief plug section) and a second pressure relief section 4122 (e.g., a second pressure relief plug section). The first pressure relief section 4121 is provided at the opening 4213. The second pressure relief section 4122 is connected to one end of the first pressure relief section 4121 adjacent to the first pressure relief channel 311. The second pressure relief section 4122 is adapted to open and close the other end of the first pressure relief channel 311. The two ends of the elastic member 423 are respectively sleeved on the outer circumference of the guide portion 4214 and the second pressure relief section 4122. Referring to Figure 3 , the opening 4213 of the pressure relief housing 421 is formed on a side of the pressure relief housing 421 away from the first pressure relief passage 311. A guide portion 4214 is formed by extending the sidewall of the opening 4213 toward the pressure relief portion 422. The sidewall of the guide portion 4214 extends along the sidewall of the pressure relief portion 422 toward the pressure relief passage 311. The first pressure relief section 4121 and the second pressure relief section 4122 are arranged along the height of the pressure relief housing 421, with the second pressure relief section 4122 located between the first pressure relief section 4121 and the first pressure relief passage 311. The second pressure relief section 4122 abuts against the first pressure relief passage 311. One end of the elastic member 423 along its length is sleeved onto the guide portion 4214, while the other end of the elastic member 423 along its length is sleeved onto the outer circumference of the second pressure relief section 4122. With this arrangement, when the pressure relief portion 422 moves upward, the first pressure relief section 4121 can move along the guide portion 4214, preventing the pressure relief portion 422 from deviating from its trajectory. The second pressure relief section 4122 can compress the elastic member 423, causing it to deform. After pressure relief is complete, the elastic member 423 begins to recover its elastic deformation, driving the second pressure relief section 4122 downward, thereby enabling the second pressure relief section 4122 to open and close the first pressure relief passage 311.

[0095] According to some embodiments of the first aspect of the present application, as shown in Figures 1 to 5, an end of the second pressure relief section 4122 adjacent to the first pressure relief channel 311 is provided with an extension portion 4123 extending radially outward, and the elastic member 423 abuts between the extension portion 4123 and the inner wall of the side where the opening 4213 of the pressure relief chamber 4212 is located. For example, in the example of Figure 3, the extension portion 4123 extends from the outer periphery of the second pressure relief section 4122 in a direction away from the second pressure relief section 4122. One end of the elastic member 423 abuts against the extension portion 4123. As a result, the compression of the elastic member 423 is facilitated, and when the elastic member 423 recovers its deformation, it also helps the second pressure relief section 4122 move downward, thereby realizing the opening and closing of the first pressure relief channel 311.

[0096] According to some embodiments of the first aspect of the present application, as shown in Figures 1-5, the pressure relief portion 422 further includes a third pressure relief section 4124 (e.g., a third pressure relief plug section). The third pressure relief section 4124 is connected to the end of the first pressure relief section 4121 away from the second pressure relief section 4122. A stopper 4125 is provided on the outside of the third pressure relief section 4124. The stopper 4125 is located on a side of the pressure relief housing 421 away from the first pressure relief passage 311 and is adapted to abut against the pressure relief housing 421. As shown in Figure 3, the third pressure relief section 4124 is located outside the pressure relief housing 421. The stopper 4125 can limit the pressure relief portion 422. Specifically, when the pressure relief portion 422 has opened the first pressure relief passage 311 and needs to move downward to close the first pressure relief passage 311, the pressure relief portion 422 moves downward until the stopper 4125 abuts against the pressure relief housing 421. The pressure relief portion 422 cannot move downward any further, indicating that the pressure relief portion 422 has moved to a fixed position. This allows the pressure relief portion 422 to move more accurately, preventing it from moving to an inappropriate position and ensuring safe use of the valve 100.

[0097] According to some embodiments of the first aspect of the present application, as shown in Figures 1-5, the first pressure relief channel 311 includes a first pressure relief channel section 3111 and a second pressure relief channel section 3112, each connected to each other. One end of the first pressure relief channel section 3111 is connected to the second valve port 13, and one end of the second pressure relief channel section 3112 is connected to the end of the first pressure relief channel section 3111 away from the second valve port 13. The valve needle pressure relief device 42 normally closes the other end of the second pressure relief channel section 3112, and the cross-sectional area of ​​the second pressure relief channel section 3112 is larger than the cross-sectional area of ​​the first pressure relief channel section 3111. Referring to Figure 3, the first pressure relief channel section 3111 and the second pressure relief channel section 3112 are arranged along the height direction of the valve needle assembly 30. The inner diameter of the first pressure relief channel section 3111 is smaller than the inner diameter of the second pressure relief channel section 3112. The valve needle pressure relief device 42 is located on the side of the second pressure relief channel section 3112 away from the first pressure relief channel section 3111. When pressure relief is not required, the valve needle pressure relief device 42 can close the second pressure relief channel section 3112. When pressure relief is required, the valve needle pressure relief device 42 can open the second pressure relief channel section 3112. The fluid at the second valve port 13 first passes through the first pressure relief channel section 3111, then through the second pressure relief channel section 3112, and then enters the pressure relief chamber 4212. From the pressure relief chamber 4212, it enters the second pressure relief channel 312, and finally flows to the outside of the valve body assembly 1, achieving pressure relief. In this way, a small amount of pressure can be released through this path to the outside of the valve body assembly 1, completing pressure relief, allowing the valve needle assembly 30 to continue operating and improving operating efficiency.

[0098] According to some embodiments of the present application, the valve needle assembly 30 includes a valve needle body 32 and a driver 33. The valve needle body 32 includes a valve needle barrel 321 and a valve needle 322. The valve needle 322 is disposed at an end of the valve needle barrel 321 adjacent to the second valve port 13. The valve needle 322 and the valve needle barrel 321 together define a valve needle chamber 36. A first pressure relief passage 311 is formed in the valve needle 322. The driver 33 is disposed at an end of the valve needle barrel 321 distal from the second valve port 13. The driver 33 is adapted to drive the valve needle body 32 to open and close the second valve port 13. The second pressure relief passage 312 is formed in the driver 33.

[0099] For example, in the example of Figures 1-3, the first pressure relief channel 311 is formed at one end of the valve needle 322 adjacent to the second valve port 13. The driving member 33 and the valve needle body 32 are arranged along the height direction of the valve needle assembly 30. The driving member 33 can drive the valve needle body 32 to move, allowing the valve needle body 32 to move up and down within the valve cavity 11 to open or close the second valve port 13. The second pressure relief channel 312 is formed inside the driving member 33. As a result, the valve needle assembly 30 can operate normally, achieving both opening and closing of the second valve port 13 and providing the valve needle pressure relief channel 31 in the valve 100, thereby improving the operating efficiency of the valve needle assembly 30.

[0100] It should be noted that, as shown in Figures 1-5, the second pressure relief channel 312 includes a first sub-pressure relief channel 3121 and a second sub-pressure relief channel 3122, which are interconnected. The first sub-pressure relief channel 3121 extends along the height of the valve needle chamber 36. One end of the first sub-pressure relief channel 3121 is connected to the valve needle chamber 36, and the other end of the first sub-pressure relief channel 3121 is connected to the second sub-pressure relief channel 3122. The free end of the second sub-pressure relief channel 3122 is connected to the exterior of the valve body assembly 1, and the second sub-pressure relief channel 3122 extends axially along the valve needle chamber 36. With this arrangement, when the pressure at the second valve port 13 is excessive and requires pressure relief, the fluid at the second valve port 13 first passes through the first sub-pressure relief channel 311 and then through the first sub-pressure relief channel 3121 and the second sub-pressure relief channel 3122 to reach the exterior of the valve body assembly 1, completing the pressure relief at the second valve port 13 and allowing the valve needle assembly 30 to continue operating.

[0101] According to some embodiments of the first aspect of the present application, as shown in Figures 1 to 5, the valve body assembly 1 includes a valve body 10 and a valve port assembly 20. A first valve port 12 and a first sub-valve port 1211 are formed on the valve body 10. The valve port assembly 20 is movably arranged in the valve body 10, and a valve cavity 11 is defined in the valve port assembly 20. A connecting valve port 131 and a second sub-valve port 132 are formed on the valve port assembly 20. The side of the connecting valve port 131 is connected to the first valve port 12. The first sub-valve port 1211 and the second sub-valve port 132 together constitute the second valve port 13. One end of the second sub-valve port 132 is connected to the first sub-valve port 1211. The valve needle assembly 30 is suitable for opening and closing the other end of the second sub-valve port 132. According to some embodiments of the first aspect of the present application, as shown in Figures 1 to 4, the first valve port 12 is formed on the side wall of the valve body 10, and the first sub-valve port 1211 is formed at the bottom of the valve body 10. The valve port assembly 20 is arranged outside the valve needle assembly 30. The valve port assembly 20 is capable of moving along the height direction of the valve body 10. The connecting valve port 131 is formed on the side wall of the valve port assembly 20. The second sub-valve port 132 is formed at the bottom of the valve port assembly 20. The valve needle 322 fits in the first sub-valve port 1211 and the second sub-valve port 132 to close the second valve port 13. When the valve needle 322 moves upward, the second sub-valve port 132 can be opened. After the valve needle 322 moves a predetermined distance, the valve needle assembly 30 and the valve port assembly 20 stop, and the valve needle assembly 30 drives the valve port assembly 20 to move upward to open the first sub-valve port 1211.

[0102] Specifically, when a fluid with a higher pressure flows from the first valve port 12 to the second valve port 13, the fluid first enters the first valve port 12. Subsequently, the valve needle assembly 30 moves upward a predetermined distance, causing the valve needle assembly 30 to abut against the valve port assembly 20. As the valve needle assembly 30 continues to move upward, it drives the valve port assembly 20 upward, further opening the first sub-valve port 1211 and increasing the opening of the second valve port 13. This facilitates communication between the second valve port 13 and the first valve port 12, allowing the fluid to smoothly exit the valve body assembly 1. This arrangement allows fluids of different pressures to pass through, allowing the valve 100 to meet different usage conditions and expand the range of use of the valve 100.

[0103] According to some embodiments of the first aspect of the present application, as shown in Figures 1 to 5, the valve body assembly 1 further includes a second elastic member 43, which abuts between the inner wall of the valve body 10 and the valve port assembly 20. Referring to Figures 1 and 4, one end of the second elastic member 43 along the length direction (for example, the up-down direction in Figure 1) abuts against the inner wall of the valve body 10, and the other end of the second elastic member 43 along the length direction abuts against the valve port assembly 20. When the valve 100 needs to be opened and the valve port assembly 20 moves upward under the force of the valve needle assembly 30, the valve port assembly 20 applies upward pressure to the second elastic member 43, causing the second elastic member 43 to elastically deform. When the valve 100 needs to be closed, the valve needle assembly 30 moves downward, and the valve port assembly 20 is tightly fitted with the valve needle assembly 30 under the action of the second elastic member 43. The pressure on the second elastic member 43 disappears, and the second elastic member 43 begins to recover its elastic deformation. At this time, the second elastic member 43 applies a restoring force to the valve port assembly 20, causing the valve port assembly 20 and the valve needle assembly 30 to move downward synchronously until the second elastic member 43 completes its elastic deformation recovery and simultaneously restores the valve port assembly 20 to the position closing the first sub-valve port 1211. This facilitates the opening and closing of the first sub-valve port 1211 by the valve port assembly 20, improves working efficiency, and ensures that the valve 100 can function normally.

[0104] In the existing technology, small-diameter expansion valves are generally used. However, such small-diameter expansion valves only support low-flow conditions and cannot achieve full-flow. For situations where full-flow and high-flow are required under specific operating conditions, a small-diameter expansion valve and a stop valve are usually connected in parallel, and a large-diameter expansion valve and a stop valve are connected in series. Under normal circumstances, liquid flows through the small-diameter valve to meet the requirements of low-flow conditions. In specific situations, the small-diameter valve is closed, and the liquid flows through the stop valve and passes through the large-diameter expansion valve to achieve full-flow and high-flow regulation. However, existing valves cannot meet the requirements of both flow conditions simultaneously, and this can only be achieved through a combination of different valves.

[0105] Based on this, the present application provides a valve 100 according to a second embodiment. The valve 100 according to the second embodiment of the present application is described below with reference to Figures 6-16. The valve 100 includes a valve body 10, a valve port assembly 20, and a valve needle assembly 30. The valve 100 has an axial direction A and a radial direction B.

[0106] Specifically, as shown in Figures 16-9, the valve body 10 defines a valve cavity 11. A first valve port 12 and a second valve port 13 are formed on the valve body 10. A valve port assembly 20 is movably disposed within the valve cavity 11 to open and close the second valve port 13. A third valve port 221 and a fourth valve port 222 are formed on the valve port assembly 20. The third valve port 221 communicates with the first valve port 12. When the valve port assembly 20 opens the second valve port 13, the first valve port 12 communicates with the second valve port 13 through the valve cavity 11, allowing fluid to flow bidirectionally between the first and second valve ports 12, 13. A valve needle assembly 30 is movably disposed within the valve port assembly 20 to open and close the fourth valve port 222. When the valve needle assembly 30 opens the fourth valve port 222, the first valve port 12 communicates with the second valve port 13 through the third and fourth valve ports 221, 222, allowing fluid to flow bidirectionally between the first and second valve ports 12, 13.

[0107] 6-9 , the valve body 10 extends along the axial direction A of the valve 100 , the first valve port 12 is provided on the side wall of the valve body 10 , and the first valve port 12 passes through the side wall of the valve body 10 along the radial direction B of the valve 100 , the second valve port 13 is provided at the lower end of the valve body 10 along the axial direction A of the valve 100 , and the second valve port 13 passes through one end of the valve body 10 along the axial direction A of the valve 100 . The valve port assembly 20 is arranged in the valve cavity 11. The valve port assembly 20 can move relative to the valve body 10 along the axial direction A of the valve 100 in the valve cavity 11. The valve port assembly 20 is arranged opposite to the second valve port 13 along the axial direction A of the valve 100. The third valve port 221 passes through the valve port assembly 20 along the radial direction B of the valve 100. The fourth valve port 222 is arranged at the lower end of the valve port assembly 20 along the axial direction A of the valve 100. The fourth valve port 222 is suitable for being arranged opposite to the second valve port 13 along the axial direction A of the valve 100. The valve port assembly 20 is configured to open or close the second valve port 13.

[0108] The valve port assembly 20 is adapted to cooperate with the valve needle assembly 30. The valve needle assembly 30 is disposed within the valve cavity 11. The valve needle assembly 30 can move relative to the valve port assembly 20 and the valve body 10 within the valve cavity 11 along the axial direction A of the valve 100. The valve needle assembly 30 is configured to open and close the fourth valve port 222. The valve needle assembly 30 and the valve port assembly 20 utilize a variable cross-section design, which allows the degree to which the valve needle assembly 30 opens the fourth valve port 222 to be adjusted, thereby regulating the flow rate of the fluid passing through the fourth valve port 222.

[0109] When the valve port assembly 20 moves in the axial direction A of the valve 100 away from the second valve port 13 to open the second valve port 13, the second valve port 13 communicates with the first valve port 12, allowing fluid to flow bidirectionally between the first valve port 12 and the second valve port 13. When the valve needle assembly 30 moves in the axial direction A of the valve 100 away from the valve port assembly 20 to open the fourth valve port 222, the second valve port 13, the fourth valve port 222, the third valve port 221, and the first valve port 12 communicate with each other, allowing fluid to flow bidirectionally between the first valve port 12 and the second valve port 13.

[0110] According to the valve 100 of the second embodiment of the present application, the valve port assembly 20 is configured to control the opening and closing of the second valve port 13 of the valve body 10, and the valve needle assembly 30 is configured to control the opening and closing of the fourth valve port 222 of the valve port assembly 20. When the fluid flowing through the valve body 10 is in a high-flow operating condition, the valve port assembly 20 opens the second valve port 13, and the fluid is suitable for bidirectional circulation between the second valve port 13 and the first valve port 12. When the fluid flowing through the valve body 10 is in a low-flow operating condition, the valve port assembly 20 closes the second valve port 13, and the valve needle assembly 30 opens the fourth valve port 222, and the fluid is suitable for circulation between the second valve port 13, the fourth valve port 222, the third valve port 221, and the first valve port 12. By adjusting the opening degree of the fourth valve port 222 by moving the valve needle assembly 30, flow regulation under low-flow operating conditions can be further achieved, achieving the controllability of the on-off valve 100 and the flow, and improving the practicality of the valve 100.

[0111] According to some embodiments of the second aspect of the present application, as shown in Figures 9 and 7, the cross-sectional area of ​​the fourth valve port 222 is different from that of the second valve port 13. When the valve needle assembly 30 moves in a direction away from the second valve port 13, the valve needle assembly 30 is suitable for driving the valve port assembly 20 to open the second valve port 13.

[0112] The cross-sectional area of ​​the fourth valve port 222 along the radial direction B of the valve 100 is smaller than the cross-sectional area of ​​the second valve port 13 along the radial direction B of the valve 100. The valve port assembly 20 has a first position and a second position for opening and closing the second valve port 13, and the valve needle assembly 30 has a third position and a fourth position for opening and closing the fourth valve port 222. When the valve port assembly 20 is in the second position and the valve needle assembly 30 is in the fourth position, the valve body 10 is in a blocked state, achieving a bidirectional sealing state between the first valve port 12 and the second valve port 13, and fluid does not flow within the valve body 10.

[0113] Under high flow conditions, the valve port assembly 20 moves from the second position to the first position along the axial direction A of the valve 100 driven by the valve needle assembly 30 to open the second valve port 13, and the fluid is suitable for bidirectional flow between the first valve port 12 and the second valve port 13.

[0114] Under low-flow conditions, the valve port assembly 20 is in the first position, and the valve needle assembly 30 moves along the axial direction A of the valve 100 from the third position toward the fourth position to open the fourth valve port 222. This connects the second valve port 13, the fourth valve port 222, the third valve port 221, and the first valve port 12, allowing fluid to flow bidirectionally between the first valve port 12 and the second valve port 13. Furthermore, as the valve needle assembly 30 moves between the third and fourth positions, the degree of opening of the fourth valve port 222 gradually increases, enabling flow regulation under low-flow conditions.

[0115] Therefore, the valve needle assembly 30 can drive the valve port assembly 20 to move to open and close the valve 100. The different settings of the cross-sectional areas of the fourth valve port 222 and the second valve port 13 can enable the valve 100 to achieve flow regulation under large flow conditions and small flow conditions by changing the position of the valve port assembly 20. When the valve 100 is in a small flow condition, the flow can be further regulated by adjusting the position of the valve needle assembly 30, thereby improving the functionality and practicality of the valve 100.

[0116] According to some embodiments of the second aspect of the present application, as shown in Figures 10-16, the valve 100 further includes a pressure relief device 40. The pressure relief device 40 is configured to open when the pressure at the second valve port 13 reaches a predetermined pressure, so that the second valve port 13 is connected to the first valve port 12 or the second valve port 13 is connected to the outside of the valve body 10. The pressure relief device 40 has an open state and a closed state. When the pressure relief device 40 is in the open state, the second valve port 13 is connected to the first valve port 12 or the second valve port 13 is connected to the outside of the valve body 10 through the pressure relief device 40, and the fluid can flow to the outside of the valve body 10 through the second valve port 13, thereby achieving a pressure relief effect. Therefore, the setting of the pressure relief device 40 enables the valve 100 to be opened under the action of pressure when the valve 100 is in a closed state, and the fluid can be relieved through the second valve port 13, thereby reducing the pressure at the second valve port 13, so that the valve needle assembly 30 or the valve port assembly 20 can avoid damage to the valve 100 when adjusting the flow of the valve 100, thereby increasing the service life of the valve 100.

[0117] According to some embodiments of the second aspect of the present application, as shown in Figures 10-13, the pressure relief device 40 includes a valve port pressure relief device 41, which is disposed on the valve port assembly 20. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 opens to allow the second valve port 13 to communicate with the first valve port 12 through the third valve port 221. In some embodiments, there may be multiple valve port pressure relief devices 41, distributed around the fourth valve port 222 of the valve port assembly 20, with the valve port pressure relief devices 41 disposed opposite the second valve port 13 along the axial direction A of the valve 100. The valve port pressure relief device 41 has an open state and a closed state. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 switches from the closed state to the open state under the action of the fluid pressure. When the valve port pressure relief device 41 is in the open state, the second valve port 13 is connected to the third valve port 221, and the fluid can flow through the second valve port 13, the valve port pressure relief device 41, the third valve port 221, and the first valve port 12 in sequence to the outside of the valve body 10, achieving the purpose of pressure relief. Therefore, the provision of the valve port pressure relief device 41 can complete pressure relief when the pressure at the second valve port 13 is excessive, reducing the pressure at the second valve port 13, balancing the pressure of the valve body 10, protecting the valve body 10, improving the durability of the valve body 10, and extending the service life of the valve body 10.

[0118] According to some embodiments of the second aspect of the present application, as shown in Figures 12 and 13, a valve port pressure relief channel 21 is formed on the valve port assembly 20, and a valve port pressure relief device 41 is arranged at the valve port pressure relief channel 21. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 opens the valve port pressure relief channel 21 to allow the second valve port 13 to communicate with the third valve port 221 through the valve port pressure relief channel 21.

[0119] The valve port pressure relief channel 21 extends along the axial direction A of the valve 100 and penetrates the valve port assembly 20 along the axial direction A of the valve 100. The valve port pressure relief channel 21 is opposite the second valve port 13 along the axial direction A of the valve 100. A second step 213 is formed in the valve port pressure relief channel 21. The second step 213 is formed by a portion of the inner wall of the valve port pressure relief channel 21 protruding toward the central axis of the valve port pressure relief channel 21. The valve port pressure relief device 41 is fitted in the valve port pressure relief channel 21 and abuts against the second step 213. The second step 213 can limit the valve port pressure relief device 41. The valve port pressure relief device 41 can move along the axial direction A of the valve 100 within the valve port pressure relief channel 21 to open or close the valve port pressure relief channel 21.

[0120] As a result, the valve port pressure relief passage 21 is adapted to communicate with the second valve port 13 and the third valve port 221. The provision of the valve port pressure relief device 41 facilitates control over the opening or closing of the valve port pressure relief passage 21, thereby controlling the communication or blocking between the second valve port 13 and the third valve port 221. When the pressure at the second valve port 13 reaches a predetermined value, the valve port pressure relief device 41, under the action of the pressure, opens the valve port pressure relief passage 21, allowing the second valve port 13 to communicate with the third valve port 221, and the third valve port 221 to communicate with the first valve port 12. Fluid can then flow out of the valve body 10 through the valve port pressure relief passage 21, the third valve port 221, and the first valve port 12 in sequence, achieving the purpose of pressure relief.

[0121] According to some embodiments of the second aspect of the present application, as shown in Figures 12 and 13, the valve port pressure relief passage 21 includes a first valve port channel section 211 and a second valve port channel section 212. The first valve port channel section 211 is in communication with the second valve port 13, and the second valve port channel section 212 is connected to a side of the first valve port channel section 211 away from the second valve port 13. A second step 213 is formed between the first valve port channel section 211 and the second valve port channel section 212. The cross-sectional area of ​​the first valve port channel section 211 along the radial direction B of the valve 100 is smaller than the cross-sectional area of ​​the second valve port channel section 212 along the radial direction B of the valve 100.

[0122] The valve port pressure relief device 41 includes a pressure relief seat 411 and a pressure relief plug 412. The pressure relief seat 411 is disposed within the second valve port channel section 212. At least one communication channel 4111 is formed on the pressure relief seat 411. The second valve port channel section 212 communicates with the third valve port 221 via the communication channel 4111. The pressure relief plug 412 is movably disposed on the pressure relief seat 411 to open and close the connection between the first valve port channel section 211 and the second valve port channel section 212.

[0123] The communication channel 4111 extends through the pressure relief seat 411 along the axial direction A of the valve 100 and communicates with the second valve port channel section 212. The pressure relief seat 411 is formed with a raised portion that protrudes along the axial direction A of the valve 100 toward the second valve port 13. The pressure relief plug 412 is formed with a recessed portion that recesses along the axial direction A of the valve 100 toward the second valve port 13. The raised portion is adapted to mate with the recessed portion, allowing the pressure relief plug 412 to move relative to the pressure relief seat 411 along the axial direction A of the valve 100. When pressure relief is not required, the end of the pressure relief plug 412 adjacent to the second valve port 13 along the axial direction A of the valve 100 abuts against the second step 213, thereby closing the first valve port channel section 211 and blocking the first valve port channel section 211 from the second valve port channel section 212. When pressure relief is required, the pressure relief plug 412 moves toward the pressure relief seat 411 along the axial direction A of the valve 100 under the action of pressure to open the first valve port channel section 211, connecting the first valve port channel section 211 and the second valve port channel section 212, and then connecting the second valve port 13 with the third valve port 221 through the first valve port channel section 211, the second valve port channel section 212 and the connecting channel 4111.

[0124] Thus, a second step portion 213 is formed between the first valve port channel section 211 and the second valve port channel section 212, and the pressure relief seat 411 cooperates with the pressure relief plug 412 to open and close the first valve port channel section 211. The second step portion 213 can limit the pressure relief plug 412, thereby ensuring that the function of the valve port pressure relief device 41 to open and close the valve port pressure relief channel 21 is realized.

[0125] According to some embodiments of the second aspect of the present application, as shown in FIG13 , the valve port pressure relief device 41 further includes a first elastic member 413, which abuts between the pressure relief seat 411 and the pressure relief plug 412. The first elastic member 413 extends along the axial direction A of the valve 100, with one end of the first elastic member 413 along the axial direction A of the valve 100 abutting against the pressure relief seat 411, and the other end of the first elastic member 413 along the axial direction A of the valve 100 abutting against the pressure relief plug 412. When pressure relief is not required, the pressure relief plug 412, under the action of the first elastic member 413, abuts against the second step 213, thereby closing the first valve port passage section 211. When the pressure at the second valve port 13 reaches a predetermined pressure, the pressure relief plug 412, under the action of the pressure, moves toward the pressure relief seat 411 along the axial direction A of the valve 100, compressing the first elastic member 413 and opening the first valve port passage section 211. After the pressure is released, the first elastic member 413 recovers its deformation, and the pressure relief plug 412, under the action of the first elastic member 413, returns to its initial position and abuts against the second step 213, thereby closing the first valve port passage section 211. Thus, the provision of the first elastic member 413 facilitates the automatic return of the valve port pressure relief device 41 to the position closing the valve port pressure relief passage 21 when no pressure is applied, thereby improving the stability of the valve port pressure relief device 41.

[0126] According to some embodiments of the second aspect of the present application, as shown in Figures 14-16 , the pressure relief device 40 includes a needle pressure relief device 42. The needle pressure relief device 42 is disposed on the needle assembly 30. When the pressure at the second valve port 13 reaches a predetermined pressure, the needle pressure relief device 42 opens, allowing the second valve port 13 to communicate with the exterior of the valve body 10. The needle assembly 30 is adapted to cooperate with the fourth valve port 222 of the valve port assembly 20, and the needle assembly 30 is opposed to the second valve port 13 along the axial direction A of the valve 100. The needle pressure relief device 42 has an open state and a closed state. When the pressure at the second valve port 13 reaches a predetermined pressure, the needle pressure relief device 42 transitions from the closed state to the open state under the action of fluid pressure. When the needle pressure relief device 42 is in the open state, the second valve port 13 communicates with the exterior of the valve body 10, allowing fluid to flow through the second valve port 13 and the needle pressure relief device 42 to the exterior of the valve body 10, achieving pressure relief. Therefore, the setting of the valve needle pressure relief device 42 can complete pressure relief when the pressure at the second valve port 13 is too high. Cooperating with the valve port pressure relief device 41, it further enhances the protection of the valve body 10 and improves the structural stability of the valve body 10.

[0127] According to some embodiments of the second aspect of the present application, as shown in Figures 15-16, a valve needle pressure relief channel 31 is formed on the valve needle assembly 30, and a valve needle pressure relief device 42 is arranged at the valve needle pressure relief channel 31. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve needle pressure relief device 42 opens the valve needle pressure relief channel 31 to allow the second valve port 13 to communicate with the outside of the valve body 10 through the valve needle pressure relief channel 31.

[0128] As shown in Figures 15 and 16, the needle pressure relief passage 31 extends along the axial direction A of the valve 100. The needle pressure relief passage 31 is opposite the second valve port 13 along the axial direction A of the valve 100. The needle pressure relief device 42 is adapted to be opposite the needle pressure relief passage 31 along the axial direction A of the valve 100. The needle pressure relief device 42 can move within the needle assembly 30 along the axial direction A of the valve 100 to open or close the needle pressure relief passage 31. When the pressure at the second valve port 13 reaches a predetermined pressure, the needle pressure relief device 42 moves along the axial direction A of the valve 100 under the action of the fluid pressure to open the needle pressure relief passage 31, thereby connecting the needle pressure relief passage 31 with the second valve port 13, and thus connecting the second valve port 13 with the exterior of the valve body 10 through the needle pressure relief passage 31. Thus, the needle pressure relief passage 31 is adapted to connect the second valve port 13 with the exterior of the valve body 10. The provision of the needle pressure relief device 42 facilitates controlling the opening or closing of the needle pressure relief passage 31, thereby controlling whether the second valve port 13 is connected to the exterior of the valve body 10. When the pressure at the second valve port 13 reaches a predetermined value, the needle pressure relief device 42, under the action of the pressure, opens the needle pressure relief passage 31, allowing fluid to flow through the second valve port 13 and the needle pressure relief passage 31 to the exterior of the valve body 10, thereby achieving the purpose of pressure relief.

[0129] According to some embodiments of the second aspect of the present application, a valve needle chamber 36 is defined within the valve needle assembly 30, a valve needle pressure relief device 42 is disposed within the valve needle chamber 36, and the valve needle pressure relief channel 31 includes a first pressure relief channel 311 and a second pressure relief channel 312. One end of the first pressure relief channel 311 is connected to the second valve port 13. The valve needle pressure relief device 42 is adapted to open and close the other end of the first pressure relief channel 311. The first pressure relief channel 311 extends along the axial direction A of the valve 100. One end of the first pressure relief channel 311 along the axial direction A of the valve 100 is connected to the second valve port 13, and the other end of the first pressure relief channel 311 along the axial direction A of the valve 100 is connected to the valve needle chamber 36. The valve needle pressure relief device 42 is disposed within the valve needle chamber 36 and is opposite to the other end of the first pressure relief channel 311 along the axial direction A of the valve 100.

[0130] According to some embodiments of the second aspect of the present application, one end of the second pressure relief channel 312 is connected to the valve needle chamber 36, and the other end of the second pressure relief channel 312 is connected to the outside of the valve body 10. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve needle pressure relief device 42 opens the other end of the first pressure relief channel 311 to allow the second valve port 13 to be connected to the second pressure relief channel 312 through the first pressure relief channel 311 and the valve needle chamber 36.

[0131] In some embodiments of the second aspect of the present application, as shown in Figures 15 and 16 , the second pressure relief channel 312 is always connected to the valve needle chamber 36. When the valve needle pressure relief device 42 opens the first pressure relief channel 311, the first pressure relief channel 311, the valve needle chamber 36, and the second pressure relief channel 312 are in a connected state. When the valve needle pressure relief device 42 closes the first pressure relief channel 311, the first pressure relief channel 311, the valve needle chamber 36, and the second pressure relief channel 312 are in a blocked state. Thus, the provision of the valve needle pressure relief device 42 facilitates controlling the opening or closing of the first pressure relief channel 311, thereby controlling the connection or blockage between the first pressure relief channel 311 and the valve needle chamber 36. When the pressure at the second valve port 13 reaches a predetermined value, the valve needle pressure relief device 42 opens the first pressure relief channel 311 under the action of pressure, so that the first pressure relief channel 311 is connected to the valve needle chamber 36. The fluid can flow to the outside of the valve body 10 through the first pressure relief channel 311, the valve needle chamber 36 and the second pressure relief channel 312 in sequence, thereby playing a role in pressure relief.

[0132] According to some embodiments of the second aspect of the present application, as shown in FIG16 , the valve needle pressure relief device 42 includes a pressure relief housing 421, a pressure relief portion 422, and an elastic member 423. The pressure relief housing 421 is disposed at the other end of the first pressure relief passage 311. The pressure relief housing 421 defines a pressure relief chamber 4212. The pressure relief housing 421 is formed with at least one pressure relief hole 4211. The pressure relief chamber 4212 communicates with the valve needle chamber 36 through the pressure relief hole 4211. The pressure relief portion 422 is movably disposed within the pressure relief chamber 4212 to open and close the other end of the first pressure relief passage 311. The elastic member 423 abuts between the pressure relief housing 421 and the pressure relief portion 422. When the pressure at the second valve port 13 reaches a predetermined pressure, the pressure relief portion 422 opens the other end of the first pressure relief passage 311, thereby communicating the first pressure relief passage 311 with the pressure relief chamber 4212.

[0133] The pressure relief chamber 4212 is disposed opposite the other end of the first pressure relief passage 311 along the axial direction A of the valve 100. A pressure relief hole 4211 is provided on the sidewall of the pressure relief housing 421 along the radial direction B of the valve 100. The pressure relief hole 4211 penetrates the pressure relief housing 421 along the radial direction B of the valve 100, thereby connecting the pressure relief chamber 4212 with the valve needle chamber 36 via the pressure relief hole 4211. The pressure relief portion 422 fits within the pressure relief chamber 4212 and opposes the other end of the first pressure relief passage 311. When the valve needle pressure relief device 42 is in the closed state, the pressure relief portion 422 abuts against the other end of the first pressure relief passage 311 to block the first pressure relief passage 311. When the valve needle pressure relief device 42 is in the open state, the pressure relief portion 422 abuts against the other end of the first pressure relief passage 311 to open the first pressure relief passage 311. The elastic member 423 extends along the axial direction A of the valve 100. One end of the elastic member 423 along the axial direction A of the valve 100 abuts against the pressure relief portion 422, while the other end of the elastic member 423 along the axial direction A of the valve 100 abuts against the pressure relief housing 421. When pressure relief is not required, the pressure relief portion 422, under the action of the elastic member 423, abuts against the other end of the first pressure relief passage 311 to close the first pressure relief passage 311. When the pressure at the second valve port 13 reaches a predetermined pressure, the pressure relief portion 422 moves along the axial direction A of the valve 100 away from the second valve port 13 under the action of the pressure, compressing the elastic member 423 and opening the first pressure relief passage 311. After the pressure is released, the elastic member 423 recovers its deformation, and the pressure relief portion 422, under the action of the elastic member 423, returns to its initial position and abuts against the other end of the first pressure relief passage 311 to close the first pressure relief passage 311.

[0134] Thus, the pressure relief housing 421 defines a pressure relief chamber 4212 to accommodate the pressure relief portion 422 and the elastic member 423. The pressure relief portion 422 and the elastic member 423 control the opening or closing of the first pressure relief passage 311. A pressure relief hole 4211 is provided in the pressure relief housing 421 to connect the pressure relief chamber 4212 with the valve needle chamber 36. The provision of the elastic member 423 enables the valve needle pressure relief device 42 to automatically return to a position closing the first pressure relief passage 311 when no pressure is applied, thereby improving the stability of the valve needle pressure relief device 42 and achieving the purpose of pressure relief.

[0135] According to some embodiments of the second aspect of the present application, as shown in Figures 15 and 16, the valve needle assembly 30 includes a valve needle body 32 and a driving member 33. The valve needle body 32 includes a valve needle cylinder 321 and a valve needle 322. The valve needle 322 is disposed at an end of the valve needle cylinder 321 adjacent to the second valve port 13. The valve needle 322 and the valve needle cylinder 321 jointly define a valve needle chamber 36. A first pressure relief passage 311 is formed on the valve needle 322. The driving member 33 is disposed at an end of the valve needle cylinder 321 away from the second valve port 13. The driving member 33 is adapted to drive the valve needle body 32 to open and close the second valve port 13. The second pressure relief passage 312 is formed on the driving member 33.

[0136] In the example of Figures 15 and 16 , the valve needle 322 is adapted to engage with the second valve port 13. The first pressure relief passage 311 penetrates the valve needle 322 along the axial direction A of the valve 100. The valve needle cylinder 321 extends along the axial direction A of the valve 100. The valve needle 322 is connected to one end of the valve needle cylinder 321, which is adjacent to the second valve port 13, along the axial direction A of the valve 100. The driver 33 is adapted to engage with the other end of the valve needle cylinder 321, which is distal to the second valve port 13, along the axial direction A of the valve 100. The driver 33 extends along the axial direction A of the valve 100, with a portion of the driver 33 extending into the valve needle cavity 36. A second pressure relief passage 312 is formed in the driver 33, connecting the valve needle cavity 36 with the exterior of the valve body 10. The second pressure relief channel 312 includes a first sub-pressure relief channel 3121 and a second sub-pressure relief channel 3122. The first sub-pressure relief channel 3121 communicates with the second sub-pressure relief channel 3122. The first sub-pressure relief channel 3121 extends along the axial direction A of the valve 100 and is located at the end of the driver 33 extending into the valve needle chamber 36 along the axial direction A of the valve 100. The first sub-pressure relief channel 3121 communicates with the valve needle chamber 36. The second sub-pressure relief channel 3122 extends along the radial direction B of the valve 100 and penetrates the driver 33 along the radial direction B of the valve 100. The second sub-pressure relief channel 3122 is located at the end of the first sub-pressure relief channel 3121 away from the valve needle chamber 36 along the axial direction A of the valve 100 and communicates with the first sub-pressure relief channel 3121. The second sub-pressure relief channel 3122 communicates with the exterior of the valve needle chamber 36.

[0137] Thus, the driver 33 can move along the axial direction A of the valve 100. The driver 33 cooperates with the valve needle body 32. When the driver 33 moves relative to the valve body 10 along the axial direction A of the valve 100, it can drive the valve needle body 32 to move relative to the valve body 10, thereby opening or closing the second valve port 13. The provision of the second pressure relief passage 312 facilitates communication between the valve needle chamber 36 and the exterior of the valve needle chamber 36. When the valve 100 requires pressure relief, fluid entering the valve needle chamber 36 from the first pressure relief passage 311 can flow to the exterior of the valve needle chamber 36 through the second pressure relief passage 312, thereby providing pressure relief.

[0138] According to some embodiments of the second aspect of the present application, as shown in Figure 15, the valve needle assembly 30 is movable relative to the valve body 10 along the axial direction A of the valve body 10, the driving member 33 is movably matched with the valve needle body 32, the driving member 33 is rotatable relative to the valve needle body 32 and is movable along the axial direction A of the valve body 10 to drive the valve needle body 32 to move relative to the valve body 10 along the axial direction A of the valve body 10, and the rotational friction between the driving member 33 and the valve needle body 32 is less than the rotational friction between the valve needle body 32 and the valve body 10.

[0139] The driving member 33 extends along the axial direction A of the valve 100. One end of the driving member 33 that cooperates with the valve needle assembly 30 along the axial direction A of the valve 100 is located in the valve body 10. The driving member 33 is coaxially arranged with the central axis of the valve body 10. The driving member 33 rotates around the central axis of the valve body 10 and moves up and down along the axial direction A of the valve 10 on the central axis of the valve body 10, thereby driving the valve needle assembly 30 to move along the central axis of the valve body 10 to realize the opening and closing of the valve body 10. The valve needle assembly 30 extends along the axial direction A of the valve 100. The valve needle assembly 30 is coaxially arranged with the driving member 33. The end of the valve needle assembly 30 adjacent to the driving member 33 along the axial direction A of the valve 100 mates with the end of the driving member 33 located within the valve body 10 along the axial direction A of the valve 100. When the driving member 33 moves along the central axis of the valve body 10 along the axial direction A of the valve 100, it drives the valve needle assembly 30 to move along the central axis of the valve body 10 along the axial direction A of the valve 100. The rotational friction between the driving member 33 and the valve needle assembly 30 is less than the rotational friction between the valve needle assembly 30 and the valve body 10. This arrangement prevents the valve needle assembly 30 from rotating when the driving member 33 rotates.

[0140] Thus, the driver 33 can drive the valve needle assembly 30 to move along the axial direction A of the valve 100, and can achieve the purpose of rotating the driver 33 while the valve needle assembly 30 does not rotate. Therefore, when the driver 33 rotates, it only drives the valve needle assembly 30 to move along the axial direction of the valve 100, avoiding relative rotational wear between the valve needle assembly 30 and the valve body 10, improving the stability and sealing of the valve needle assembly 30, and improving the step loss phenomenon of the valve 100. At the same time, because the friction between the driver 33 and the valve needle assembly 30 is relatively low, the torque when the driver 33 drives the valve needle assembly 30 to move can be reduced, reducing the requirements for the specifications of the driver 33 and reducing costs.

[0141] According to some embodiments of the second aspect of the present application, as shown in Figure 15, a friction reduction component 34 is provided between the driving member 33 and the valve needle assembly 30. When the driving member 33 rotates relative to the valve needle body 32, the valve needle body 32 does not rotate relative to the valve body 10.

[0142] The friction-reducing assembly 34 is engaged with the end of the driver 33 adjacent to the needle assembly 30 along the axial direction A of the valve 100, and is disposed within the needle cavity 36. Specifically, the friction-reducing assembly 34 is disposed between the end of the driver 33 located within the valve body 10 along the axial direction A of the valve 100 and the needle assembly 30. The end of the driver 33 adjacent to the needle assembly 30 along the axial direction A of the valve 100 is adapted to be fixedly connected to the end of the needle assembly 30 along the axial direction A of the valve 100 by riveting, so that the driver 33 and the needle assembly 30 can achieve relative rotation via the friction-reducing assembly 34.

[0143] Therefore, a friction reducing component 34 is provided between the driving member 33 and the valve needle assembly 30. The friction reducing component 34 can reduce the rotational friction between the driving member 33 and the valve needle assembly 30, making it smaller than the rotational friction between the valve needle assembly 30 and the valve body 10, and when the driving member 33 rotates, it will not drive the valve needle assembly 30 to rotate relative to the valve body 10, thereby improving the step loss phenomenon of the valve 100.

[0144] According to some embodiments of the second aspect of the present application, as shown in FIG15 , the needle assembly 30 further includes a first elastic return member 35, which is abutted between the needle pressure relief device 42 and the friction reducing assembly 34. The first elastic return member 35 is disposed within the needle cavity 36 and is arranged relative to the friction reducing assembly 34 and the needle pressure relief device 42 along the axial direction A of the valve 100. One end of the first elastic return member 35, adjacent to the driver 33 along the axial direction A of the valve 100, abuts against the friction reducing assembly 34. The other end of the first elastic member 413, away from the driver 33 along the axial direction A of the valve 100, is adapted to abut against the needle pressure relief device 42. The first elastic return member 35 applies pressure to the needle pressure relief device 42 and the friction reducing assembly 34, thereby pressing the needle pressure relief device 42 against the valve needle 322 to block the first pressure relief passage 311. As a result, the first elastic reset member 35 stops between the friction reduction component 34 and the valve needle 322. The first elastic reset member 35 can limit the friction reduction component 34 and have a certain buffering effect on the valve needle 322, making the assembly of the internal structure of the valve 100 more stable and extending the service life of the valve 100.

[0145] According to some embodiments of the second aspect of the present application, the friction-reducing component 34 is a bearing assembly. The bearing assembly includes an inner ring, an outer ring, and a ball bearing, with the ball bearing disposed between the inner and outer rings. One end of the driver 33, along the axial direction A of the valve 100, is loosely engaged with the inner ring of the bearing assembly, while the outer ring abuts against the inner wall of the valve needle assembly 30. When the driver 33 rotates, it drives the inner ring and ball bearing of the bearing assembly to rotate relative to the outer ring of the bearing assembly. The outer ring of the bearing assembly does not rotate relative to the valve needle assembly 30, and the valve needle assembly 30 does not rotate relative to the valve body 10. Thus, the friction-reducing assembly 34 is provided as a bearing assembly, which converts the rotational friction between the driver 33 and the needle assembly 30 into rolling friction within the bearing assembly, thereby reducing the friction between the driver 33 and the needle assembly 30. This ensures that when the driver 33 rotates relative to the needle assembly 30, the needle assembly 30 does not rotate relative to the valve body 10. This ensures that the needle assembly 30, under the action of the driver 33, moves only in the axial direction A of the valve 100, thereby improving the movement stability of the needle assembly 30. The friction-reducing assembly 34 also protects the driver 33. By reducing the friction between the driver 33 and the needle assembly 30, it can reduce the torque applied to the driver 33 during rotation, prevent damage to the driver 33, and extend the service life of the valve 100.

[0146] According to some embodiments of the second aspect of the present application, the pressure relief device 40 is a one-way valve 100. A one-way valve 100, which allows fluid to flow only through the water inlet and prevents backflow through the water outlet, is used in hydraulic systems to prevent reverse flow of fluid. In this embodiment, the pressure relief device 40 is a one-way valve 100, which allows fluid to flow only through the second valve port 13 into the valve body 10 and then through the valve body 10 to the outside of the valve body 10, preventing backflow of the fluid. This achieves the pressure relief function while ensuring the normal operation of the valve 100 and enhancing the safety of the valve 100.

[0147] According to some embodiments of the second aspect of the present application, as shown in FIG12 , the valve assembly 20 includes a valve body 22 and a valve seat 23. The valve body 22 is disposed within the valve cavity 11, a third valve port 221 is formed on the valve body 22, the valve seat 23 is disposed at an end of the valve body 22 adjacent to the second valve port 13, and a fourth valve port 222 is formed on the valve seat 23. The valve seat 23 and the valve body 22 jointly define a valve cavity 24. One end of a valve needle assembly 30 passes through an end of the valve body 22 distal from the second valve port 13 and fits within the valve cavity 24. The valve seat 23 is adapted to open and close the second valve port 13.

[0148] The valve body 22 extends along the axial direction A of the valve 100. The third valve port 221 extends through the sidewall of the valve body 22 along the radial direction B of the valve 100. The valve seat 23 is connected to one end of the valve body 22 along the axial direction A of the valve 100. The fourth valve port 222 extends through the valve seat 23 along the axial direction A of the valve 100. The valve needle assembly 30 is fitted within the valve cavity 24 and is movable within the valve cavity 24 along the axial direction A of the valve 100. The valve needle 322 is adapted to cooperate with the fourth valve port 222 to open or close the fourth valve port 222. The fourth valve port 222 is opposite the second valve port 13 along the axial direction A of the valve 100.

[0149] Therefore, the valve seat 23 is used to open or close the second valve port 13. The valve seat 23 and the valve body 22 jointly define the valve cavity 11 for accommodating the valve needle assembly 30, which is beneficial to simplify the structure of the valve 100, reduce the number of parts in the valve 100, and save the production cost of the valve 100.

[0150] According to some embodiments of the second aspect of the present application, as shown in Figures 11 and 12, there is a first step portion 14 between the second valve port 13 and the valve cavity 11, and the end surface of the valve port seat 23 adjacent to the second valve port 13 can be detachably matched with the first step portion 14 to open and close the second valve port 13.

[0151] The first step 14 is provided at one end of the valve body 10 along the axial direction A of the valve 100, where the second valve port 13 is located. The first step 14 is formed by a portion of the inner wall of the valve body 10 protruding toward the central axis of the valve body 10. When the valve seat 23 closes the second valve port 13, the end surface of the valve seat 23 adjacent to the second valve port 13 along the axial direction A of the valve 100 is adapted to contact and abut against the first step 14. When the valve seat 23 opens the second valve port 13, the valve assembly 20 moves within the valve cavity 11 along the axial direction A of the valve 100 in a direction away from the second valve port 13, and the abutment between the end surface of the valve seat 23 adjacent to the second valve port 13 along the axial direction A of the valve 100 and the first step 14 is released.

[0152] Therefore, the valve port seat 23 cooperates with the first step portion 14 to facilitate opening and closing the second valve port 13. The first step portion 14 can play a certain limiting role on the valve port seat 23 in the axial direction A of the valve 100, thereby improving the stability of the internal structure assembly of the valve 100.

[0153] According to some embodiments of the second aspect of the present application, as shown in Figures 11 and 12, a mating protrusion 141 extending toward the valve seat 23 is provided on the first step portion 14. The valve seat 23 includes a first valve seat segment 231 and a second valve seat segment 232. The first valve seat segment 231 is fitted within the valve body 22, and the second valve seat segment 232 is connected to an end of the first valve seat segment 231 adjacent to the second valve port 13. The second valve seat segment 232 is located on a side of the valve body 22 adjacent to the second valve port 13. The second valve seat segment 232 protrudes from the outer circumferential surface of the valve 100 in the radial direction of the valve body 10. A mounting groove 233 is formed on the end surface of the second valve seat segment 232 adjacent to the second valve port 13. A sealing member 234 is disposed within the mounting groove 233. The sealing member 234 detachably engages with the mating protrusion 141.

[0154] A mating protrusion 141 is formed on the end surface of the first step portion 14 facing the valve port seat 23 along the axial direction A of the valve 100. A first valve port seat segment 231 is provided on the side of the valve port seat 23 away from the second valve port 13 along the axial direction A of the valve 100. The first valve port seat segment 231 is inserted into the valve port body 22. The second valve port seat segment 232 is provided on the side of the valve port seat 23 adjacent to the second valve port 13 along the axial direction A of the valve 100. A third step portion is formed between the first valve port seat segment 231 and the second valve port seat segment 232. The end of the valve port body 22 adjacent to the second valve port 13 along the axial direction A of the valve 100 abuts against the third step portion. The mounting groove 233 is formed by a recessed portion of the end surface of the second valve port seat section 232, located adjacent to the second valve port 13 along the axial direction A of the valve 100, in a direction away from the second valve port 13. A sealing member 234 is mounted within the mounting groove 233. The sealing member 234 opposes the mating protrusion 141 along the axial direction A of the valve 100. When the valve port seat 23 closes the second valve port 13, the sealing member 234 abuts against the mating protrusion 141. When the valve port seat 23 opens the second valve port 13, the sealing member 234 separates from the mating protrusion 141.

[0155] Therefore, the setting of the first valve seat section 231 and the second valve seat section 232 facilitates the cooperation between the valve seat 23 and the valve body 22 and the second valve port 13. The setting of the protrusion 141 and the sealing member 234 can improve the sealing performance of the valve seat 23 when closing the second valve port 13, making the contact between the valve seat 23 and the first step portion 14 closer, thereby ensuring the sealing performance of the valve 100.

[0156] According to some embodiments of the second aspect of the present application, as shown in FIG12 , a sealing member 234 and the inner wall of the mounting groove 233 define a mounting cavity. The mounting cavity is located radially inward of the second valve port 13, and a valve port gasket 235 is disposed within the mounting cavity. The valve port gasket 235 is disposed between the inner wall of the mounting cavity and the sealing member 234 along a radial direction B of the valve 100. The provision of the valve port gasket 235 facilitates improving the sealing performance of the valve port assembly 20 against the second valve port 13, preventing fluid leakage and ensuring the sealing performance and normal operation of the valve 100.

[0157] According to some embodiments of the second aspect of the present application, as shown in Figure 11, the valve 100 further includes a second elastic return member 25, which is sleeved on the outside of the valve mouth body 22, and the second elastic return member 25 is stopped between the valve mouth seat 23 and the inner wall of the valve cavity 11.

[0158] The second elastic return member 25 is arranged in the valve cavity 11, and the second elastic return member 25 extends along the axial direction A of the valve 100. The upper end of the second elastic return member 25 along the axial direction A of the valve 100 stops at the inner wall of the valve cavity 11, and the lower end of the second elastic return member 25 along the axial direction A of the valve 100 stops at the end surface of the valve port seat 23 away from the second valve port 13.

[0159] Driven by the driver 33, the valve assembly 20 moves along the axial direction A of the valve 100 away from the second valve port 13. When the second valve port 13 is opened, the second elastic return member 25 is compressed and deformed. When the second valve port 13 is closed, the second elastic return member 25 recovers its deformation and drives the valve assembly 20 toward the second valve port 13. The valve seat 23 contacts the first step 14, and the valve assembly 20 stops moving and closes the second valve port 13. Thus, the provision of the second elastic return member 25 can improve the stability of the movement of the valve assembly 20, making the on-off valve 100 more stable and reliable. It can also ensure a closer contact between the valve assembly 20 and the first step 14, thereby sealing the second valve port 13 and improving the sealing and structural stability of the valve 100.

[0160] In existing technology, needle-type electronic expansion valves are typically used in low-flow conditions. However, in vehicle heat pump systems, both high-flow and low-flow conditions may exist simultaneously. In such cases, needle-type electronic expansion valves alone cannot meet the requirements. High-flow conditions can damage the electronic expansion valve, shortening its service life and resulting in poor applicability.

[0161] Based on this, the present application provides a valve 100 according to a third embodiment. The valve 100 according to the third embodiment of the present application is described below with reference to Figures 17-21. As shown in Figures 17-21, the valve 100 according to the third embodiment of the present application includes a valve body 10, a valve port assembly 20, a valve needle assembly 30, and a valve port pressure relief device 41.

[0162] Specifically, the valve body 10 defines a valve cavity 11, and is formed with a first valve port 12 and a second valve port 13. A valve port assembly 20 is movably disposed within the valve cavity 11 to open and close the second valve port 13, with the valve port assembly 20 normally closing the second valve port 13. A third valve port 221 and a fourth valve port 222 are formed in the valve port assembly 20, with the third valve port 221 communicating with the first valve port 12. A valve needle assembly 30 is movable relative to the valve port assembly 20 to open and close the fourth valve port 222, with the valve needle assembly 30 normally closing the fourth valve port 222. A valve port pressure relief device 41 is disposed on the valve port assembly 20. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 opens, thereby communicating the second valve port 13 with the third valve port 221.

[0163] For example, in the examples of Figures 17-21, the first valve port 12 is formed on the side wall of the valve body 10 and is arranged at intervals along the circumference of the valve body 10. The second valve port 13 is formed at the bottom of the valve body 10. The first valve port 12 and the second valve port 13 are both connected to the valve cavity 11. The aperture of the second valve port 13 can be larger than the aperture of the first valve port 12. The valve port assembly 20 can move within the valve cavity 11 along the height direction of the valve cavity 11 (for example, the vertical direction in Figure 17). One end of the valve port assembly 20 generally cooperates with the second valve port 13 to close the second valve port 13. When the second valve port 13 needs to be opened, the valve port assembly 20 moves upward to open the second valve port 13.

[0164] The third valve port 221 is formed on the sidewall of the valve assembly 20 and can be spaced apart along the circumference of the valve assembly 20. The third valve port 221 communicates with the first valve port 12. The fourth valve port 222 is formed at the bottom of the valve assembly 20, opposite the second valve port 13. A valve needle assembly 30 is disposed within the valve assembly 20 and is movable along the height of the valve assembly 20. One end of the valve needle assembly 30 engages with the fourth valve port 222, keeping the fourth valve port 222 normally closed. That is, when the valve 100 is not operating, the valve assembly 20 closes the second valve port 13, and the valve needle assembly 30 closes the fourth valve port 222. At this time, no fluid flows within the valve 100. When the valve needle assembly 30 moves upward, the fourth valve port 222 is opened.

[0165] The valve port pressure relief device 41 is located on the side of the valve port assembly 20 adjacent to the second valve port 13. When the second valve port 13 needs to be opened, the valve port assembly 20 moves away from the second valve port 13. If the pressure at the second valve port 13 reaches a predetermined pressure, i.e., if the pressure on the second valve port 13 is too high, the valve port pressure relief device 41 opens, allowing the fluid to flow from the second valve port 13 to the third valve port 221 and then be discharged through the first valve port 12, thereby relieving the pressure and allowing the valve port assembly 20 to move normally without damaging the valve port assembly 20.

[0166] When the valve 100 is used in a vehicle heat pump system, fluid can flow into the valve 100 from the bottom and out from the sidewall of the valve 100, that is, the fluid enters the valve cavity 11 through the second valve port 13 and then is discharged from the first valve port 12. When the pressure of the fluid flowing into the second valve port 13 is relatively high, the second valve port 13 is subjected to relatively high pressure after the fluid flows to the second valve port 13. At this time, the instantaneous pressure of the second valve port 13 is too high. If the pressure is not relieved, this instantaneous pressure will directly and quickly push the valve port assembly 20 upward, causing damage to the valve port assembly 20. Thus, when the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 opens first, allowing some of the fluid at the second valve port 13 to flow out through the third valve port 221 and the first valve port 12, thereby relieving the pressure at the second valve port 13 and reducing the instantaneous pressure there. Simultaneously, the valve needle assembly 4 moves upward to open the fourth valve port 222. After the valve needle assembly 4 abuts against the valve port assembly 20, it drives the valve port assembly 20 upward, increasing the distance between the valve port assembly 20 and the second valve port 13. The fluid is then divided into two parts: one part flows out of the valve body 10 through the second valve port 13, the fourth valve port 222, the third valve port 221, and the first valve port 12, while the other part flows out of the valve body 10 through the second valve port 13 and the first valve port 12. Thus, the valve port pressure relief device 41 protects the valve port assembly 20 from damage during operation and allows the fluid to flow smoothly out of the valve 100.

[0167] It should be noted that when the pressure at the second valve port 13 does not reach the predetermined pressure, the fluid may flow through the second valve port 13, the fourth valve port 222 and the third valve port 221 and then be discharged from the first valve port 12. At this time, the valve port pressure relief device 41 is in a closed state.

[0168] When the valve is used in a vehicle heat pump system, fluid can also flow in from the side wall of the valve 100 and out from the bottom of the valve 100, that is, the fluid enters the valve cavity 11 from the first valve port 12 and then is discharged from the second valve port 13. When the fluid with lower pressure flows from the first valve port 12 to the third valve port 221, the valve needle assembly 30 moves upward, opening the fourth valve port 222. The valve needle assembly 30 then continues to move upward until the valve needle assembly 30 stops at the valve port assembly 20, and then continues to drive the valve port assembly 20 to move upward together, opening the second valve port 13, so that the fourth valve port 222 is connected to the second valve port 13. At this time, the fluid is divided into two parts. One part of the fluid flows out of the valve body 10 through the first valve port 12, the third valve port 221, the fourth valve port 222, and the second valve port 13, and the other part of the fluid flows out of the valve body 10 through the first valve port 12 and the second valve port 13.

[0169] When the higher-pressure fluid flows from the first valve port 12 to the third valve port 221, the opening of the fourth valve port 222 needs to be increased. At this time, the valve needle assembly 30 continues to move upward to fully open the fourth valve port 222, and the flow path of the fluid is consistent with the flow path of the lower-pressure fluid. The valve needle assembly 30 has a balancing hole. When the fluid pressure is high, the balancing hole on the valve needle assembly 30 can balance the internal and external pressures of the valve body 10, allowing the fluid to flow unimpeded within the valve body 10, allowing the fluid to smoothly enter the valve body 10 through the first valve port 12 and smoothly flow out of the valve body 10 through the second valve port 13.

[0170] To sum up, the valve port pressure relief device 41 protects the valve port assembly 20, preventing the valve port assembly 20 from being damaged during operation, extending the service life of the valve 100, and at the same time increasing the diversity of the working modes of the valve 100, so that the valve 100 can be applied to small flow conditions and large flow conditions, thereby improving the applicability of the valve 100.

[0171] According to the valve 100 of the third embodiment of the present application, a valve port pressure relief device 41 is provided on the second valve port 13. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 opens to connect the second valve port 13 with the third valve port 221. Thus, compared with a conventional electronic expansion valve, the valve port pressure relief device 41 can protect the valve port assembly 20, preventing damage to the valve port assembly 20 during operation, thereby extending the service life of the valve 100. Furthermore, the valve 100 can be applied to both low-flow and high-flow operating conditions, thereby improving the applicability of the valve 100.

[0172] According to some embodiments of the third aspect of the present application, the valve port pressure relief device 41 is a one-way pressure relief device, which is configured to allow the fluid at the second valve port 13 to flow unidirectionally to the third valve port 221. Referring to Figures 17-20, one end of the valve port pressure relief device 41 is connected to the valve port assembly 20. The fluid flowing through the second valve port 13 can only flow to the third valve port 221 through the valve port pressure relief device 41, and the fluid cannot flow from the third valve port 221 to the second valve port 13. That is, the valve port pressure relief device 41 is a one-way valve. This configuration can prevent the fluid from flowing back after the valve 100 is opened, ensure the normal operation of the valve 100, and enhance the safety of the valve 100.

[0173] According to some embodiments of the third aspect of the present application, a valve port pressure relief channel 21 is formed on the valve port assembly 20, and a valve port pressure relief device 41 is arranged at the valve port pressure relief channel 21. When the pressure at the second valve port 13 reaches a predetermined pressure, the valve port pressure relief device 41 opens the valve port pressure relief channel 21 to allow the second valve port 13 to communicate with the third valve port 221 through the valve port pressure relief channel 21.

[0174] According to some embodiments of the third aspect of the present application, as shown in FIG19 , a valve port pressure relief passage 21 is provided on a side of the valve port assembly 20 adjacent to the second valve port 13, and both ends of the valve port pressure relief passage 21 are respectively connected to the second valve port 13 and the third valve port 221. The valve port pressure relief passage 21 extends along the height direction of the valve port assembly 20 (e.g., the vertical direction in FIG17 and FIG19 ), and the valve port pressure relief device 41 is provided at the end of the valve port pressure relief passage 21 away from the second valve port 13. When the pressure at the second valve port 13 reaches a predetermined pressure, the pressure is transmitted to the valve port pressure relief device 41 through the valve port pressure relief channel 21. The valve port pressure relief device 41, under pressure, moves upward, thereby opening the valve port pressure relief channel 21, connecting the second valve port 13 and the third valve port 221. The fluid can continue to move upward and flow through the valve port pressure relief channel 21 to the third valve port 221, and then flow into the valve cavity 11 through the third valve port 221. The fluid in the valve cavity 11 can then flow to the outside through the first valve port 12, completing the pressure relief. With this arrangement, the valve 100 has a separate valve port pressure relief channel 21, which improves the efficiency of pressure relief.

[0175] According to some embodiments of the third aspect of the present application, the valve port pressure relief channel 21 includes a first valve port channel section 211 and a second valve port channel section 212. The first valve port channel section 211 is in communication with the second valve port 13. The second valve port channel section 212 is connected to a side of the first valve port channel section 211 away from the second valve port 13.

[0176] In some embodiments of the third aspect of the present application, the valve port pressure relief device 41 is arranged in the second valve port channel section 212. For example, in the example of Figure 19, the first valve port channel section 211 and the second valve port channel section 212 are arranged along the height direction of the valve port assembly 20. The inner diameter of the first valve port channel section 211 is smaller than the inner diameter of the second valve port channel section 212. The valve port pressure relief device 41 is in the second valve port channel section 212 and abuts against the first valve port channel section 211. When pressure relief is not required, the valve port pressure relief device 41 can close the valve port pressure relief channel 21. When pressure relief is required, the valve port pressure relief device 41 can open the valve port pressure relief channel 21. As a result, the valve port pressure relief device 41 facilitates the opening and closing of the valve port pressure relief channel 21, so as to smoothly complete the pressure relief and improve work efficiency.

[0177] According to some embodiments of the third aspect of the present application, as shown in FIG19 , the valve port pressure relief device 41 includes a pressure relief seat 411 and a pressure relief plug 412. The pressure relief seat 411 is disposed within the second valve port channel section 212. At least one communication channel 4111 is formed on the pressure relief seat 411. The second valve port channel section 212 communicates with the third valve port 221 via the communication channel 4111. The pressure relief plug 412 is movably disposed on the pressure relief seat 411 to open and close the connection between the first valve port channel section 211 and the second valve port channel section 212.

[0178] In some embodiments of the third aspect of the present application, referring to FIG. 19 , multiple communication channels 4111 are provided, spaced apart circumferentially around the pressure relief seat 411 . These communication channels 4111 connect the third valve port 221 with the second valve port channel section 212 . A pressure relief plug 412 is disposed on the side of the pressure relief seat 411 adjacent to the first valve port channel section 211 . The pressure relief plug 412 abuts against the first valve port channel section 211 . The pressure relief plug 412 is positioned within the second valve port channel section 212 and is movable along the height of the second valve port channel section 212 . Before the pressure at the second valve port 13 reaches a predetermined pressure, the pressure relief plug 412 abuts against the first valve port channel section 211 , closing the first valve port channel section 211. Once the pressure at the second valve port 13 reaches the predetermined pressure, the pressure passes through the first valve port channel section 211, exerting upward pressure on the pressure relief plug 412 , causing it to move upward, thereby opening the first valve port channel section 211. As a result, part of the fluid is discharged from the first valve port channel section 211, enters the third valve port 221 through the communication channel 4111, and is discharged from the valve body 10 through the first valve port 12 through the third valve port 221, thereby completing the pressure relief. The valve port assembly 20 then continues to move upward, and the second valve port 13 continues to open, allowing the fluid to flow through the second valve port 13 to the fourth valve port 222, the third valve port 221, and the first valve port 12, and then flow from the first valve port 12 to the outside of the valve body 10, allowing the heat pump system to operate normally.

[0179] With such a configuration, the control of the opening and closing of the first valve port channel section 211 is simple, and the flow path of the fluid after passing through the first valve port channel section 211 is also smooth, so that the valve 100 can work normally.

[0180] In some optional embodiments of the third aspect, as shown in FIG20 , the valve needle assembly 30 includes a second communication channel 37, which includes a first communication channel section 371 and a second communication channel section 372 that communicate with each other. The first communication channel section 371 extends along the height of the valve body 10. One end of the first communication channel section 371 communicates with the second valve port 13, and the other end of the first communication channel section 371 communicates with the second communication channel section 372. The free end of the second communication channel section 372 communicates with the exterior of the valve body 10, and the second communication channel section 372 extends axially along the valve body 10. With this arrangement, fluid can pass through the valve needle assembly 30, enter the first and second communication channel sections 371, 372, and be discharged to the exterior of the valve body 10, thereby increasing the fluid path and improving the operating efficiency of the valve 100.

[0181] According to some embodiments of the third aspect of the present application, as shown in FIG19 , a mating hole 414 is formed on the pressure relief plug 412. The pressure relief seat 411 includes a first pressure relief seat portion 4112 and a second pressure relief seat portion 4113. The first pressure relief seat portion 4112 is provided at an end of the second valve port channel section 212 away from the first valve port channel section 211, and a connecting channel 4111 is formed on the first pressure relief seat portion 4112. One end of the second pressure relief seat portion 4113 is connected to the first pressure relief seat portion 4112, and the other end of the second pressure relief seat portion 4113 extends toward the first valve port channel section 211. The mating hole 414 is mated with the other end of the second pressure relief seat portion 4113, allowing the pressure relief plug 412 to move along the second pressure relief seat portion 4113 to open and close the connection between the first valve port channel section 211 and the second valve port channel section 212.

[0182] As shown in Figure 19, the mating hole 414 is formed in the middle of the pressure relief plug 412 and is formed by a depression on the side of the pressure relief plug 412 away from the first valve port channel section 211. The first pressure relief seat 4112 and the second pressure relief seat 4113 are arranged along the height direction of the second valve port channel section 212. The connecting channel 4111 extends along the height direction of the first pressure relief seat 4112, and the free end of the second pressure relief seat 4113 slides in engagement with the mating hole 414. This arrangement limits the displacement of the pressure relief plug 412, preventing the pressure relief plug 412 from freely moving within the second valve port channel section 212, and ensuring that the pressure relief plug 412 can keep the first valve port channel section 211 normally closed.

[0183] According to some embodiments of the third aspect of the present application, there are multiple communication channels 4111. In the description of this application, "multiple" means two or more. The multiple communication channels 4111 are arranged at intervals along the circumference of the first pressure relief seat 4112. For example, in the example of Figure 19, there are two communication channels 4111. The greater the number of communication channels 4111, the greater the amount of fluid flowing out through the communication channels 4111, the higher the pressure relief efficiency of the valve port pressure relief channel 21, and the improved operating efficiency of the valve 100.

[0184] According to some embodiments of the third aspect of the present application, the valve port pressure relief device 41 further includes a first elastic member 413 , and the first elastic member 413 is stopped between the first pressure relief seat 4112 and the pressure relief plug 412 .

[0185] As shown in Figure 19, the first elastic member 413 is sleeved on the second pressure relief seat 4113 and abuts against the pressure relief plug 412. When the pressure relief plug 412 is moved upward by pressure, the first elastic member 413 is compressed and deformed, and the first valve port channel section 211 opens, completing the pressure relief. Subsequently, the pressure on the pressure relief plug 412 disappears, and the compression force on the first elastic member 413 also disappears. The first elastic member 413 begins to recover its elastic deformation, causing the pressure relief plug 412 to move toward the first valve port channel section 211 until the pressure relief plug 412 abuts against the first valve port channel section 211, thereby completing the recovery of the elastic deformation of the first elastic member 413. As a result, the valve port pressure relief device 41 can smoothly open and close the first valve port channel section 211, thereby improving work efficiency.

[0186] According to some embodiments of the third aspect of the present application, referring to FIG19 , the outer surface of the pressure relief plug 412 is spherical. The spherical shape of the pressure relief plug 412 increases the contact area between the pressure relief plug 412 and the first valve port channel section 211. This configuration enhances the sealing performance of the pressure relief plug 412 against the first valve port channel section 211.

[0187] According to some embodiments of the third aspect of the present application, the valve 100 further includes a second elastic member 43, which abuts between the inner wall of the valve cavity 11 and the valve port assembly 20. For example, in the examples of Figures 17, 18, and 20, the second elastic member 43 is disposed between the valve body 10 and the valve port assembly 20, with one end of the second elastic member 43 along the length direction (e.g., the up-down direction in Figure 17) abutting against the inner wall of the valve cavity 11, and the other end of the second elastic member 43 along the length direction abutting against the valve port assembly 20. When the valve 100 needs to be opened and the valve port assembly 20 moves upward under the force of the valve needle assembly 30, the valve port assembly 20 applies upward pressure to the second elastic member 43, causing the second elastic member 43 to undergo elastic deformation. When the valve 100 needs to be closed, the valve needle assembly 30 moves downward, and the valve port assembly 20 is tightly fitted with the valve needle assembly 30 under the action of the second elastic member 43. The pressure on the second elastic member 43 disappears, and the second elastic member 43 begins to recover its elastic deformation. At this time, the second elastic member 43 applies a restoring force to the valve port assembly 20, causing the valve port assembly 20 and the valve needle assembly 30 to move downward synchronously until the second elastic member 43 completes its elastic deformation recovery and simultaneously restores the valve port assembly 20 to the position closing the second valve port 13. This facilitates the opening and closing of the second valve port 13 by the valve port assembly 20, improves working efficiency, and ensures the normal operation of the valve 100.

[0188] The vehicle 200 according to the fourth aspect of the present application includes a valve 100 according to any one of the first, second or third aspects of the present application, as shown in FIG22 .

[0189] According to the vehicle 200 of the fourth aspect embodiment of the present application, by adopting the valve 100 according to the first aspect or the third aspect embodiment of the present application, the working efficiency of the vehicle 200 can be improved, which is beneficial to improving the user experience.

[0190] According to the vehicle 200 of the fourth embodiment of the present application, by adopting the valve 100 according to the second embodiment of the present application, a friction reducing assembly 34 is provided inside the valve 100 to enable the driving member 33 to rotate in conjunction with the valve needle assembly 30. When the valve needle assembly 30 is driven to move, the force generated by the rotation of the driving member 33 is prevented from causing the valve needle assembly 30 to rotate. This reduces the wear on the fourth valve port 222 caused by the valve needle assembly 30 abutting against the fourth valve port 222 to achieve sealing of the fourth valve port 222, thereby ensuring the sealing of the fourth valve port 222 when the valve needle assembly 30 abuts against the fourth valve port 222. Furthermore, by providing a pressure relief device 40 inside the valve port assembly 20 and the valve needle assembly 30, when the pressure inside the valve 100 is high at the second valve port 13, the pressure relief device 40 can be provided to protect the valve 100 in a timely manner, thereby increasing the service life of the vehicle 200 and reducing the cost of using the vehicle 200.

[0191] 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 device or element referred to 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.

[0192] In the description of the present application, "first feature" and "second feature" may include one or more of the features. In the description of the present application, "plurality" means two or more. In the description of the present application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present application, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0193] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0194] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A valve (100), characterized in that: include: A valve body assembly (1), wherein a valve cavity (11) is defined in the valve body assembly (1), and a first valve port (12) and a second valve port (13) are formed on the valve body assembly (1); a valve needle assembly (30), the valve needle assembly (30) being movably disposed in the valve cavity (11) to open and close the second valve port (13), the valve needle assembly (30) normally closing the second valve port (13); and A valve needle pressure relief device (42), wherein the valve needle pressure relief device (42) is arranged on the valve needle assembly (30), and when the pressure at the second valve port (13) reaches a predetermined pressure, the valve needle pressure relief device (42) opens to allow the second valve port (13) to communicate with the outside of the valve body assembly (1).

2. The valve (100) according to claim 1, characterized in that The valve needle pressure relief device (42) is a one-way pressure relief device, and the valve needle pressure relief device (42) is configured to allow the fluid at the second valve port (13) to flow unidirectionally to the outside of the valve body assembly (1).

3. The valve (100) according to claim 1 or 2, characterized in that: A valve needle pressure relief channel (31) is formed on the valve needle assembly (30), and the valve needle pressure relief device (42) is arranged at the valve needle pressure relief channel (31). When the pressure at the second valve port (13) reaches the predetermined pressure, the valve needle pressure relief device (42) opens the valve needle pressure relief channel (31) so that the second valve port (13) is connected to the outside of the valve body assembly (1) through the valve needle pressure relief channel (31).

4. The valve (100) according to claim 3, characterized in that The valve needle assembly (30) defines a valve needle chamber (36), and the valve needle pressure relief device (42) is disposed in the valve needle chamber (36); The valve needle pressure relief channel (31) comprises: a first pressure relief channel (311), one end of the first pressure relief channel (311) being in communication with the second valve port (13), and the valve needle pressure relief device (42) normally closing the other end of the first pressure relief channel (311); and a second pressure relief channel (312), one end of the second pressure relief channel (312) being in communication with the valve needle chamber (36), and the other end of the second pressure relief channel (312) being in communication with the outside of the valve body assembly (1); When the pressure at the second valve port (13) reaches the predetermined pressure, the valve needle pressure relief device (42) opens the other end of the first pressure relief channel (311) so that the second valve port (13) is connected to the second pressure relief channel (312) through the first pressure relief channel (311) and the valve needle chamber (36).

5. The valve (100) according to claim 4, characterized in that The valve needle pressure relief device (42) comprises: a pressure relief housing (421), the pressure relief housing (421) being disposed at the other end of the first pressure relief passage (311), the pressure relief housing (421) defining a pressure relief chamber (4212), the pressure relief housing (421) being formed with at least one pressure relief hole (4211), the pressure relief chamber (4212) being in communication with the valve needle chamber (36) through the pressure relief hole (4211); and a pressure relief portion (422), the pressure relief portion (422) being movably disposed in the pressure relief chamber (4212) to open and close the other end of the first pressure relief channel (311); When the pressure at the second valve port (13) reaches the predetermined pressure, the pressure relief portion (422) opens the other end of the first pressure relief channel (311) to allow the first pressure relief channel (311) to communicate with the pressure relief chamber (4212).

6. The valve (100) according to claim 5, characterized in that The valve needle pressure relief device (42) further comprises: An elastic member (423), wherein the elastic member (423) is abutted between the pressure relief housing (421) and the pressure relief portion (422).

7. The valve (100) according to claim 6, characterized in that An opening (4213) is formed on the pressure relief housing (421), the opening (4213) is in communication with the pressure relief chamber (4212), and a guide portion (4214) extending toward the first pressure relief channel (311) is provided at the opening (4213); The pressure relief portion (422) comprises: a first pressure relief section (4121), the first pressure relief section (4121) being disposed at the opening (4213); and A second pressure relief section (4122), the second pressure relief section (4122) is connected to one end of the first pressure relief section (4121) adjacent to the first pressure relief channel (311), the second pressure relief section (4122) is suitable for opening and closing the other end of the first pressure relief channel (311), and both ends of the elastic member (423) are respectively sleeved on the outer peripheral sides of the guide portion (4214) and the second pressure relief section (4122).

8. The valve (100) according to claim 7, characterized in that An end of the second pressure relief section (4122) adjacent to the first pressure relief channel (311) is provided with an extension portion (4123) extending radially outward, and the elastic member (423) is stopped between the extension portion (4123) and the inner wall of the side where the opening (4213) of the pressure relief chamber (4212) is located.

9. The valve (100) according to claim 7 or 8, characterized in that The pressure relief portion (422) further comprises: A third pressure relief section (4124), the third pressure relief section (4124) is connected to one end of the first pressure relief section (4121) away from the second pressure relief section (4122), the outer sleeve of the third pressure relief section (4124) is provided with a limiting member (4125), the limiting member (4125) is located on a side of the pressure relief housing (421) away from the first pressure relief channel (311), and the limiting member (4125) is suitable for abutting against the pressure relief housing (421).

10. The valve (100) according to any one of claims 4 to 9, characterized in that: The first pressure relief channel (311) comprises a first pressure relief channel section (3111) and a second pressure relief channel section (3112) which are connected to each other, one end of the first pressure relief channel section (3111) is connected to the second valve port (13), one end of the second pressure relief channel section (3112) is connected to an end of the first pressure relief channel section (3111) which is away from the second valve port (13), the valve needle pressure relief device (42) normally closes the other end of the second pressure relief channel section (3112), and the cross-sectional area of ​​the second pressure relief channel section (3112) is greater than the cross-sectional area of ​​the first pressure relief channel section (3111).

11. The valve (100) according to any one of claims 4 to 10, characterized in that: The valve needle assembly (30) comprises: a valve needle body (32), the valve needle body (32) comprising a valve needle cylinder (321) and a valve needle (322), the valve needle (322) being arranged at one end of the valve needle cylinder (321) adjacent to the second valve port (13), the valve needle (322) and the valve needle cylinder (321) jointly defining the valve needle chamber (36), the first pressure relief channel (311) being formed on the valve needle (322); and A driving member (33), wherein the driving member (33) is arranged at one end of the valve needle cylinder (321) away from the second valve port (13), and the driving member (33) is suitable for driving the valve needle body (32) to open and close the second valve port (13), and the second pressure relief channel (312) is formed on the driving member (33).

12. The valve (100) according to any one of claims 1 to 11, characterized in that: The valve body assembly (1) comprises: a valve body (10), wherein the first valve port (12) and a first sub-valve port (1211) are formed on the valve body (10); and A valve port assembly (20), wherein the valve port assembly (20) is movably disposed in the valve body (10), the valve cavity (11) is defined in the valve port assembly (20), a connecting valve port (131) and a second sub-valve port (132) are formed on the valve port assembly (20), the connecting valve port (131) is connected to the first valve port (12), the first sub-valve port (1211) and the second sub-valve port (132) together constitute the second valve port (13), one end of the second sub-valve port (132) is connected to the second sub-valve port (132), and the valve needle assembly (30) is suitable for opening and closing the other end of the second sub-valve port (132).

13. The valve (100) according to claim 12, characterized in that The valve body assembly (1) further comprises a second elastic member (43), wherein the second elastic member (43) abuts between the inner wall of the valve body (10) and the valve port assembly (20).

14. A valve (100), characterized in that: include: A valve body (10), wherein a valve cavity (11) is defined in the valve body (10), and a first valve port (12) and a second valve port (13) are formed on the valve body (10); A valve port assembly (20), the valve port assembly (20) being movably disposed in the valve cavity (11) to open and close the second valve port (13), the valve port assembly (20) being formed with a third valve port (221) and a fourth valve port (222), the third valve port (221) being in communication with the first valve port (12), and when the valve port assembly (20) When the second valve port (13) is opened, the first valve port (12) is connected to the second valve port (13) through the valve cavity (11), and fluid is suitable for bidirectional flow between the first valve port (12) and the second valve port (13); as well as A valve needle assembly (30), wherein the valve needle assembly (30) is movably disposed on the valve port assembly (20) to open and close the fourth valve port (222); when the valve needle assembly (30) opens the fourth valve port (222), the first valve port (12) is connected to the second valve port (13) through the third valve port (221) and the fourth valve port (222), and the fluid is suitable for bidirectional flow between the first valve port (12) and the second valve port (13).

15. The valve (100) according to claim 14, characterized in that The cross-sectional area of ​​the fourth valve port (222) is different from that of the second valve port (13). When the valve needle assembly (30) moves in a direction away from the second valve port (13), the valve needle assembly (30) is suitable for driving the valve port assembly (20) to open the second valve port (13).

16. The valve (100) according to claim 14 or 15, characterized in that Further including: A pressure relief device (40), wherein the pressure relief device (40) is configured to open when the pressure at the second valve port (13) reaches a predetermined pressure so that the second valve port (13) is connected to the first valve port (12) or the second valve port (13) is connected to the outside of the valve body (10).

17. The valve (100) according to claim 16, characterized in that The pressure relief device (40) comprises: A valve port pressure relief device (41), wherein the valve port pressure relief device (41) is arranged on the valve port assembly (20), and when the pressure at the second valve port (13) reaches a predetermined pressure, the valve port pressure relief device (41) opens to allow the second valve port (13) to communicate with the first valve port (12) through the third valve port (221).

18. The valve (100) according to claim 17, characterized in that A valve port pressure relief channel (21) is formed on the valve port assembly (20), and the valve port pressure relief device (41) is arranged at the valve port pressure relief channel (21). When the pressure at the second valve port (13) reaches the predetermined pressure, the valve port pressure relief device (41) opens the valve port pressure relief channel (21) so that the second valve port (13) is connected to the third valve port (221) through the valve port pressure relief channel (21).

19. The valve (100) according to claim 18, characterized in that The valve port pressure relief channel (21) comprises a first valve port channel section (211) and a second valve port channel section (212), the first valve port channel section (211) being in communication with the second valve port (212), and the second valve port channel section (212) being connected to a side of the first valve port channel section (211) away from the second valve port (13); The valve port pressure relief device (41) comprises: a pressure relief seat (411), the pressure relief seat (411) being arranged in the second valve port channel section (212), the pressure relief seat (411) being formed with at least one communication channel (4111), the second valve port channel section (212) being communicated with the third valve port (221) through the communication channel (4111); and A pressure relief plug (412), wherein the pressure relief plug (412) is movably disposed on the pressure relief seat (411) to open and close the connection between the first valve port channel section (211) and the second valve port channel section (212).

20. The valve (100) according to claim 19, characterized in that The valve port pressure relief device (41) further comprises: A first elastic member (413), wherein the first elastic member (413) is abutted between the pressure relief seat (411) and the pressure relief plug (412).

21. The valve (100) according to any one of claims 17 to 20, characterized in that: The pressure relief device (40) comprises: A valve needle pressure relief device (42), wherein the valve needle pressure relief device (42) is arranged on the valve needle assembly (30), and when the pressure at the second valve port (13) reaches a predetermined pressure, the valve needle pressure relief device (42) opens to allow the second valve port (13) to communicate with the outside of the valve body (10).

22. The valve (100) according to claim 21, characterized in that A valve needle pressure relief channel (31) is formed on the valve needle assembly (30), and the valve needle pressure relief device (42) is arranged at the valve needle pressure relief channel (31). When the pressure at the second valve port (13) reaches the predetermined pressure, the valve needle pressure relief device (42) opens the valve needle pressure relief channel (31) so that the second valve port (13) is connected to the outside of the valve body (10) through the valve needle pressure relief channel (31).

23. The valve (100) according to claim 22, characterized in that The valve needle assembly (30) defines a valve needle chamber (36), and the valve needle pressure relief device (42) is disposed in the valve needle chamber (36); The valve needle pressure relief channel (31) includes a first pressure relief channel (311) and a second pressure relief channel (312), one end of the first pressure relief channel (311) is connected to the second valve port (13), and the valve needle pressure relief device (42) is suitable for opening and closing the other end of the first pressure relief channel (311), one end of the second pressure relief channel (312) is connected to the valve needle chamber (36), and the other end of the second pressure relief channel (312) is connected to the outside of the valve body (10), when the pressure at the second valve port (13) reaches the predetermined pressure, the valve needle pressure relief device (42) opens the other end of the first pressure relief channel (311) to allow the second valve port (13) to be connected to the second pressure relief channel (312) through the first pressure relief channel (311) and the valve needle chamber (36).

24. The valve (100) according to claim 23, characterized in that The valve needle pressure relief device (42) comprises: a pressure relief housing (421), the pressure relief housing (421) being arranged at the other end of the first pressure relief passage (311), the pressure relief housing (421) defining a pressure relief chamber (4212), the pressure relief housing (421) being formed with at least one pressure relief hole (4211), the pressure relief chamber (4212) being in communication with the valve needle chamber (36) through the pressure relief hole (4211); a pressure relief portion (422), the pressure relief portion (422) being movably disposed in the pressure relief chamber (4212) to open and close the other end of the first pressure relief channel (311); and an elastic member (423), the elastic member (423) being abutted between the pressure relief housing (421) and the pressure relief portion (422); When the pressure at the second valve port (13) reaches the predetermined pressure, the pressure relief portion (422) opens the other end of the first pressure relief channel (311) to allow the first pressure relief channel (311) to communicate with the pressure relief chamber (4212).

25. The valve (100) according to claim 23 or 24, characterized in that The valve needle assembly (30) comprises: a valve needle body (32), the valve needle body (32) comprising a valve needle cylinder (321) and a valve needle (322), the valve needle (322) being arranged at one end of the valve needle cylinder (321) adjacent to the second valve port (13), the valve needle (322) and the valve needle cylinder (321) jointly defining the valve needle chamber (36), the first pressure relief channel (311) being formed on the valve needle (322); and A driving member (33), wherein the driving member (33) is arranged at one end of the valve needle cylinder (321) away from the second valve port (13), and the driving member (33) is suitable for driving the valve needle body (32) to open and close the second valve port (13), and the second pressure relief channel (312) is formed on the driving member (33).

26. The valve (100) according to claim 25, characterized in that The valve needle assembly (30) is movable relative to the valve body (10) along the axial direction of the valve body (10); The driving member (33) and the valve needle body (32) are movably matched, and the driving member (33) is rotatable relative to the valve needle body (32) and movable along the axial direction of the valve body (10) to drive the valve needle body (32) to move relative to the valve body (10) along the axial direction of the valve body (10), and the rotational friction between the driving member (33) and the valve needle body (32) is smaller than the rotational friction between the valve needle body (32) and the valve body (10).

27. The valve (100) according to claim 25 or 26, characterized in that A friction reducing component (34) is provided between the driving member (33) and the valve needle component (30); when the driving member (33) rotates relative to the valve needle body (32), the valve needle body (32) does not rotate relative to the valve body (10).

28. The valve (100) according to claim 27, characterized in that Further including: A first elastic reset member (35), wherein the first elastic reset member (35) is abutted between the valve needle pressure relief device (42) and the friction reducing component (34).

29. The valve (100) according to claim 27 or 28, characterized in that The friction reducing component (34) is a bearing component.

30. The valve (100) according to any one of claims 16 to 29, characterized in that The pressure relief device (40) is a one-way valve (100).

31. The valve (100) according to any one of claims 14 to 30, characterized in that The valve port assembly (20) comprises: a valve port body (22), the valve port body (22) being arranged in the valve cavity (11), the third valve port (221) being formed on the valve port body (22); and The valve seat (23) is arranged at one end of the valve body (22) adjacent to the second valve port (13), and the fourth valve port (222) forms a On the valve seat (23), the valve seat (23) and the valve body (22) jointly define a valve cavity (24), one end of the valve needle assembly (30) passes through an end of the valve body (22) away from the second valve port (13) and fits in the valve cavity (24), and the valve seat (23) is suitable for opening and closing the second valve port (13).

32. The valve (100) according to claim 31, characterized in that A first step portion (14) is provided between the second valve port (13) and the valve cavity (11), and an end surface of the valve port seat (23) adjacent to one end of the second valve port (13) is detachably matched with the first step portion (14) to open and close the second valve port (13).

33. The valve (100) according to claim 32, characterized in that The first step portion (14) is provided with a matching protrusion (141) extending toward the valve seat (23); The valve seat (23) comprises: A first valve seat section (231), the first valve seat section (231) being fitted in the valve body (22); and A second valve port seat section (232), the second valve port seat section (232) is connected to one end of the first valve port seat section (231) adjacent to the second valve port (13), the second valve port seat section (232) is located on a side of the valve port body (22) adjacent to the second valve port (13), the second valve port seat section (232) protrudes from the outer peripheral surface of the valve (100) along the radial direction of the valve body (10), and a mounting groove (233) is formed on the end surface of one end of the second valve port seat section (232) adjacent to the second valve port (13), a sealing member (234) is provided in the mounting groove (233), and the sealing member (234) is detachably mated with the mating protrusion (141).

34. The valve (100) according to claim 33, characterized in that The sealing member (234) and the inner wall of the mounting groove (233) jointly define a mounting cavity, the mounting cavity being located radially inward of the second valve port (13), and a valve port gasket (235) being provided in the mounting cavity.

35. The valve (100) according to any one of claims 31 to 34, characterized in that Further including: A second elastic return member (25), wherein the second elastic return member (25) is sleeved outside the valve port body (22), and the second elastic return member (25) abuts between the valve port seat (23) and the inner wall of the valve cavity (11).

36. A valve (100), characterized in that: include: A valve body (10), wherein a valve cavity (11) is defined in the valve body (10), and a first valve port (12) and a second valve port (13) are formed on the valve body (10); a valve port assembly (20), the valve port assembly (20) being movably disposed in the valve cavity (11) to open and close the second valve port (13), the valve port assembly (20) normally closing the second valve port (13), a third valve port (221) and a fourth valve port (222) being formed on the valve port assembly (20), the third valve port (221) being in communication with the first valve port (12); a valve needle assembly (30), wherein the valve needle assembly (30) is movable relative to the valve port assembly (20) to open and close the fourth valve port (222), and the valve needle assembly (30) normally closes the fourth valve port (222); as well as A valve port pressure relief device (41), wherein the valve port pressure relief device (41) is arranged on the valve port assembly (20), and when the pressure at the second valve port (13) reaches a predetermined pressure, the valve port pressure relief device (41) opens to allow the second valve port (13) to communicate with the third valve port (221).

37. The valve (100) according to claim 36, characterized in that The valve port pressure relief device (41) is a one-way pressure relief device, and the valve port pressure relief device (41) is configured to allow the fluid at the second valve port (13) to flow unidirectionally toward the third valve port (221).

38. The valve (100) according to claim 36 or 37, characterized in that A valve port pressure relief channel (21) is formed on the valve port assembly (20), and the valve port pressure relief device (41) is arranged at the valve port pressure relief channel (21). When the pressure at the second valve port (13) reaches the predetermined pressure, the valve port pressure relief device (41) opens the valve port pressure relief channel (21) so that the second valve port (13) is connected to the third valve port (221) through the valve port pressure relief channel (21).

39. The valve (100) according to claim 38, characterized in that The valve port pressure relief channel (21) comprises: a first valve port channel section (211), the first valve port channel section (211) being in communication with the second valve port (13); and A second valve port channel section (212), wherein the second valve port channel section (212) is connected to a side of the first valve port channel section (211) away from the second valve port (13), and the valve port pressure relief device (41) is arranged in the second valve port channel section (212).

40. The valve (100) according to claim 39, characterized in that The valve port pressure relief device (41) comprises: a pressure relief seat (411), the pressure relief seat (411) being arranged in the second valve port channel section (212), the pressure relief seat (411) being formed with at least one communication channel (4111), the second valve port channel section (212) being communicated with the third valve port (221) through the communication channel (4111); and A pressure relief plug (412), the pressure relief plug (412) being movably disposed on the pressure relief seat (411) to open and close the connection between the first valve port channel section (211) and the second valve port channel section (212).

41. The valve (100) according to claim 40, characterized in that The pressure relief plug (412) is formed with a matching hole (414); The pressure relief seat (411) comprises: a first pressure relief seat portion (4112), the first pressure relief seat portion (4112) being provided at an end of the second valve port channel section (212) away from the first valve port channel section (211), the communication channel (4111) being formed on the first pressure relief seat portion (4112); and A second pressure relief seat (4113), one end of the second pressure relief seat (4113) is connected to the first pressure relief seat (4112), the other end of the second pressure relief seat (4113) extends toward the first valve port channel section (211), the matching hole (414) matches with the other end of the second pressure relief seat (4113), so that the pressure relief plug (412) can be moved along the second pressure relief seat (4113) to open and close the connection between the first valve port channel section (211) and the second valve port channel section (212).

42. The valve (100) according to claim 40 or 41, characterized in that There are a plurality of the communicating channels (4111), and the plurality of communicating channels (4111) are arranged at intervals along the circumference of the first pressure relief seat (4112).

43. The valve (100) according to claim 41, characterized in that The valve port pressure relief device (41) further comprises: A first elastic member (413), wherein the first elastic member (413) is stopped between the first pressure relief seat (4112) and the pressure relief plug (412).

44. The valve (100) according to any one of claims 40 to 43, characterized in that The outer surface of the pressure relief plug (412) is formed in a spherical shape.

45. The valve (100) according to any one of claims 36 to 44, characterized in that Also includes: A second elastic member (43), wherein the second elastic member (43) abuts between the inner wall of the valve cavity (11) and the valve port assembly (20).

46. ​​A vehicle (200), characterized in that: The vehicle (200) comprises a valve (100) according to any one of claims 1-45.

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