Valve core assembly, expansion valve and vehicle-mounted air conditioner

Abstract

A valve core assembly, an expansion valve and a vehicle-mounted air conditioner. The valve core assembly comprises a valve core (5) and a screw rod (4), wherein the valve core (5) is internally provided with a first through hole section (51), a second through hole section (52), and an internal thread section (53) located between the first through hole section (51) and the second through hole section (52); the screw rod (4) is externally provided with a first guide section (41), a second guide section (42), and an external thread section (43) located between the first guide section (41) and the second guide section (42); and when the valve core (5) is in threaded fit with the screw rod (4), axial guidance is provided both above and below the threaded pair.

Description

Valve core assembly, expansion valve and vehicle air conditioner

[0001] This application claims priority to the Chinese patent application filed on December 15, 2023, with application number 202323438716.3, entitled "A valve core assembly, expansion valve and vehicle air conditioner", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of expansion valves, and in particular to a valve core assembly, an expansion valve, and a vehicle air conditioner. Background Art

[0003] The expansion valve is a crucial component in refrigeration systems, widely used in indoor and vehicle air conditioners, evaporators, and refrigerators. Its working medium is refrigerant, operating in ambient temperatures between -40°C and 125°C. It requires low noise, low power consumption, high sensitivity, and a low starting voltage. The expansion valve primarily controls the refrigerant flow rate to ensure that the evaporator outlet is completely filled with gaseous refrigerant. Excessive flow could result in liquid refrigerant entering the compressor and causing liquid hammer. Excessive flow could cause premature evaporation, resulting in insufficient cooling.

[0004] Expansion valves typically control fluid flow by rotating the rotor to drive the screw up and down, which in turn drives the valve needle up and down. However, when the rotor and screw rotate, excessive deflection will generate noise and further affect the accuracy of flow control.

[0005] Summary of the Invention

[0006] The Abstract section introduces a series of simplified concepts that will be further described in the Detailed Description section. The Abstract section of this application is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] The present application provides a valve core assembly, comprising:

[0008] A valve core, wherein a valve core inner hole is formed in the valve core, and the valve core inner hole includes a first through hole section, a second through hole section, and an internal thread section located between the first through hole section and the second through hole section;

[0009] a screw rod, the screw rod passing through the inner hole of the valve core, the screw rod comprising a rotor fitting portion, a valve needle fitting portion, and a valve core fitting portion provided between the rotor fitting portion and the valve needle fitting portion, the rotor fitting portion being used to connect with the rotor, the valve needle fitting portion being used to connect with the valve needle, the valve core fitting portion comprising a first guide section, a second guide section, and an external thread section located between the first guide section and the second guide section;

[0010] Particularly, the first through hole section cooperates with the first guide section along the axial guiding of the screw rod, the second through hole section cooperates with the second guide section along the axial guiding of the screw rod, the internal thread section cooperates with the external thread section, the gap between the first guide section and the inner wall of the first through hole section is smaller than the gap between the external thread section and the internal thread section, and the gap between the second guide section and the inner wall of the second through hole section is smaller than the gap between the external thread and the internal thread section.

[0011] Optionally, the difference between the gap between the external thread segment and the internal thread segment and the gap between the second guide segment and the inner wall of the second through hole segment ranges from 0.03mm to 0.05mm, the gap between the first guide segment and the inner wall of the first through hole segment ranges from 0.01mm to 0.03mm, the gap between the second guide segment and the inner wall of the second through hole segment ranges from 0.03mm to 0.05mm, and the gap between the external thread segment and the internal thread segment ranges from 0.05mm to 0.08mm.

[0012] Optionally, a valve core internal connector is provided in the valve core, a positioning hole is provided on the valve core internal connector, the valve core is made of injection molding material, the valve core internal connector is made of metal material, and the injection molding material includes polyetheretherketone.

[0013] The present application also provides an expansion valve, comprising a valve core assembly as described in any one of the above items, the expansion valve also comprising a shell assembly, a valve needle and a rotor, wherein the shell assembly forms an internal space, a first channel and a second channel, the valve core is riveted to the shell assembly; the valve needle is movably arranged in the internal space, the valve needle is connected to the screw; the rotor is used to drive the screw to rotate relative to the valve core, driving the valve needle to move to adjust the fluid flow between the second channel and the internal space.

[0014] Optionally, the housing assembly includes a valve body, a valve seat and a cover body, the valve body is fixedly connected to the valve core, the cover body is arranged on the outside of the rotor, the lower end of the cover body is fixedly connected to the valve body, the cover body and the valve body are interference fit to form the upper part of the internal space, the valve seat is fixedly connected to the valve body, the valve seat and the valve body are interference fit to form the lower part of the internal space, and the upper part of the internal space is connected to the lower part of the internal space to form a valve cavity.

[0015] Optionally, a first channel hole for forming the first channel is provided on a side wall of the valve body, and a second channel hole for forming the second channel is provided in a middle area of ​​the valve seat.

[0016] Optionally, the rotor mating portion of the screw is fixedly connected to the rotor, and the rotor is sleeved on the outside of the valve core. When the rotor rotates, the screw is driven to rotate, and the external thread segment and the internal thread segment cooperate to form a thread pair to convert the rotational motion of the rotor into axial linear motion of the valve needle, so that the second channel hole is opened or closed.

[0017] Optionally, the valve needle mating portion of the screw is provided with a screw cavity, the first end of the screw pressure head of the valve needle extends into the screw cavity to be fixedly connected or detachably connected to the screw, and the flange portion of the second end of the screw pressure head extends into the valve needle cavity of the valve needle, and the valve needle cavity is connected to the valve cavity.

[0018] Optionally, the valve needle chamber is provided with a valve needle spring, and the valve needle spring is in a compressed state.

[0019] The present application also provides a vehicle air conditioner, comprising any of the above expansion valves.

[0020] According to the valve core assembly, expansion valve and vehicle air conditioner provided by the present application, by arranging a first through hole section, a second through hole section and an internal thread section located between the first through hole section and the second through hole section in the valve core, and arranging a first guide section, a second guide section and an external thread section located between the first guide section and the second guide section outside the screw, when the valve core and the screw thread are matched, axial guides are provided above and below the thread pair to prevent excessive deflection of the screw and the rotor, reduce the noise of the expansion valve, and improve the flow control accuracy of the expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings of the present application are used as part of the present application for understanding the present application. The drawings show embodiments of the present application and their descriptions, which are used to explain the principle of the present application.

[0022] In the attached figure:

[0023] FIG1 is a schematic structural diagram of an expansion valve according to an embodiment of the present application;

[0024] 2-3 are schematic structural diagrams of a valve core according to an embodiment of the present application;

[0025] FIG4 is a schematic structural diagram of a screw and a valve needle according to an embodiment of the present application.

[0026] Figure 1: cover 2: rotor 3: limiting mechanism 4: screw 5: valve core 6: valve body 7: valve needle 8: valve seat 31: limiting rod 32: limiting spring 41: first guide section 42: second guide section 43: external thread section 50: valve core inner hole 51: first through hole section 52: second through hole section 53: internal thread section 54: valve core inner connecting piece 55: positioning hole 71: screw pressure head 72: valve needle pressure ring 73: valve needle spring 74: valve needle gasket DETAILED DESCRIPTION

[0027] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, some technical features well known in the art are not described in order to avoid confusion with the present application.

[0028] To thoroughly understand this application, the following description provides a detailed explanation of the expansion valve and vehicle air conditioner of this application. Obviously, the application is not limited to the specific details familiar to those skilled in the art of expansion valves. Preferred embodiments of this application are described in detail below, but in addition to these detailed descriptions, this application may also have other embodiments.

[0029] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0030] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions is exaggerated, and the same reference numerals are used to represent the same elements, and their description will be omitted.

[0031] The present application provides a valve core assembly, as shown in FIG1 , comprising a valve core 5 and a screw 4 .

[0032] 2 , a valve core inner hole 50 is formed in the valve core 5 , and the valve core inner hole 50 includes a first through hole section 51 , a second through hole section 52 , and an internal thread section 53 located between the first through hole section and the second through hole section.

[0033] 1 and 4 , the screw 4 passes through the inner hole of the valve core, and the screw 4 includes a rotor fitting portion, a valve needle fitting portion, and a valve core fitting portion arranged between the rotor fitting portion and the valve needle fitting portion. The rotor fitting portion is used to connect with the rotor 2, and the valve needle fitting portion is used to connect with the valve needle 7. The valve core fitting portion includes a first guide section 41, a second guide section 42, and an external thread section 43 located between the first guide section and the second guide section.

[0034] In one embodiment, the first through hole section 51 cooperates with the first guide section 41 along the axial guiding of the screw rod 4, the second through hole section 52 cooperates with the second guide section 42 along the axial guiding of the screw rod, the internal thread section 53 is threadedly engaged with the external thread section 43, the gap between the first guide section and the inner wall of the first through hole section is smaller than the gap between the external thread section and the internal thread section, and the gap between the second guide section and the inner wall of the second through hole section is smaller than the gap between the external thread and the internal thread section.

[0035] In one embodiment, the gap between the external thread segment 43 and the internal thread segment 53 includes the radial gap between the thread crest of the external thread and the thread root of the internal thread, and the gap between the external thread segment and the internal thread segment also includes the radial gap between the thread root of the external thread and the thread crest of the internal thread. The gap between the first guide segment 41 and the inner wall of the first through-hole segment 51 is the gap between the outer surface of the first guide segment of the screw and the inner wall of the first through-hole segment of the valve core inner hole. The gap between the second guide segment 42 and the inner wall of the second through-hole segment 52 is the gap between the outer surface of the second guide segment of the screw and the inner wall of the second through-hole segment of the valve core inner hole.

[0036] In one embodiment, the difference between the gap between the external thread segment and the internal thread segment and the gap between the second guide segment and the inner wall of the second through hole segment ranges from 0.03mm to 0.05mm, the gap between the first guide segment and the inner wall of the first through hole segment ranges from 0.01mm to 0.03mm, the gap between the second guide segment and the inner wall of the second through hole segment ranges from 0.03mm to 0.05mm, and the gap between the external thread segment and the internal thread segment ranges from 0.05mm to 0.08mm.

[0037] By respectively arranging a first through hole section and a first guide section, a second through hole section and a second guide section for clearance fit above and below the internal thread section and the external thread section for thread fit, the screw is provided with axial guidance when moving upward and downward relative to the valve core, thereby avoiding excessive deflection of the screw and the rotor, and making the gap size of the guide channel smaller than the gap size of the thread pair, thereby further limiting the deflection range of the screw and the rotor.

[0038] In one embodiment, the valve core 5 is made of an injection molding material, and the injection molding material includes but is not limited to polyetheretherketone (PEEK). Other high-strength injection molding materials can also be used to make the valve core 5, and this application does not impose any restrictions on this. By using a high-strength injection molding material to make the valve core 5, not only can the valve core be prevented from being damaged, the replacement frequency of the valve core be reduced, and the service life of the valve core be extended, but the valve core internal connector 54 shown in Figures 2 and 3 can also be formed during the injection molding process, thereby simplifying the production process of the valve core 5 with the valve core internal connector 54. The valve core internal connector 54 can be made of a metal material, for example, stainless steel (SUS304) is used to make an in-mold injection-molded steel sheet as the valve core internal connector 54, and one or more positioning holes 55 are provided on the valve core internal connector 54, and the positioning holes 55 are used to connect the valve core 5 with other components (for example, the valve body).

[0039] The present application provides an expansion valve, as shown in FIG1 , which includes the valve core assembly described above, as well as a housing assembly, a valve needle 7, and a rotor 2. The housing assembly defines an interior space, a first channel, and a second channel; the valve core 5 is riveted to the housing assembly; the valve needle 7 is movably disposed in the interior space and connected to the screw 4; and the rotor 2 is configured to drive the screw 4 to rotate relative to the valve core 5, thereby driving the valve needle 7 to move to adjust the fluid flow between the second channel and the interior space.

[0040] In one embodiment, the housing assembly includes a valve body 6, a valve seat 8, and a cover 1. The valve body 6 is fixedly connected to the valve core 5, the cover 1 is arranged to cover the outer side of the rotor 2, the lower end of the cover 1 is fixedly connected to the valve body 6, the cover 1 and the valve body 6 are interference fit to form the upper part of the internal space, the valve seat 8 is fixedly connected to the valve body 6, the valve seat 8 and the valve body 6 are interference fit to form the lower part of the internal space, and the upper part of the internal space is connected to the lower part of the internal space to form a valve cavity.

[0041] In one embodiment, the cover body 1 is made of a magnetic isolation material. Specifically, the cover body 1 includes but is not limited to an iron core cover. The cover body 1 is a rotating body structure, and the rotation center of the cover body 1 coincides with the rotation center of the screw 4. As shown in Figure 1, the cover body 1 has a single opening. The cover body 1 is arranged on the outside of the rotor 2. The lower end of the cover body 1 (i.e., the open end) is fixedly connected to the valve body 6. Specifically, the lower end of the cover body 1 is interference fit with the valve body 6, and the cover body 1 is welded to the valve body 6. By combining the interference fit with the welding connection, the stability of the connection between the cover body 1 and the valve body 6 is ensured, and the cover body 1 and the valve body 6 constitute the upper part of the valve cavity after being connected. The combination of interference fit and welding also enhances the airtightness of the valve cavity.

[0042] In one embodiment, rotor 2 is made of a magnetically conductive material and is also referred to as a magnetic rotor. Rotor 2 is a rotating body structure, with its center of rotation coinciding with that of screw 4. Rotor 2 is fixedly connected to a rotor mating portion at the first end of screw 4. Specifically, the central axis of rotor 2 is provided by a metal insert (not shown), which can be fixedly connected to screw 4 by welding or other methods.

[0043] In one embodiment, as shown in FIG1 , a limiting mechanism 3 is further included, and the limiting mechanism 3 includes a limiting rod 31 and / or a limiting spring 32. A limiting rod 31 and a limiting rod fixing member are provided in the middle of the rotor 2. The limiting rod 31 is interference-fitted from the bottom of the rotor 2, and then penetrates and is welded from the front of the limiting rod fixing member. The limiting rod fixing member is welded integrally with the screw 4 to achieve a fixed connection between the limiting rod 31 and the screw 4. A limiting spring 32 and a spring guide are provided on the outside of the valve core 5. The limiting spring 32 can be made of metal material. The limiting spring 32 rotates in conjunction with the spring guide and is limited by the limiting rod 31. The end of the limiting spring 32 contacts the limiting rod 31 to limit the rotation of the rotor 2 and the screw 4.

[0044] In one embodiment, screw 4 is a rotating body structure, and its material includes, but is not limited to, metal. The first end of screw 4 forms a rotor mating portion, which is fixedly connected to rotor 2, as described above. Referring to Figures 1 and 4 , the valve needle mating portion of screw 4 includes a screw cavity, which is fixedly or removably connected to valve needle 7.

[0045] In one embodiment, a valve core internal connector 54 is provided in the valve core 5. The connection between the valve core 5 and the valve body 6 includes: the valve core 5 is first riveted into the valve body 6 to rivet the valve core 5 and the valve body 6, and then the in-mold injection-molded steel sheet (i.e., the valve core internal connector 54) is fixedly connected to the valve body 6 by welding or other connection methods. That is, the valve core 5 and the valve body 6 are fixedly connected by the valve core internal connector 54 and the valve body.

[0046] By riveting the valve core to the valve body and fixedly connecting the valve core to the valve body through an inner connecting piece of the valve core, the height dimension of the valve core is shortened, the structure of the expansion valve is compact, and the volume of the expansion valve is reduced.

[0047] In one embodiment, the material of the valve body 6 includes but is not limited to metal material. The valve body 6 is a rotating body structure, and the rotation center of the valve body 6 coincides with the rotation center of the screw 4. The upper part of the valve body 6 is interference fit with the cover body 1 and fixedly connected, as described above. The middle part of the valve body 6 is fixedly connected to the valve core 5 through the valve core internal connector 54, as described above. The lower part of the valve body 6 is fixedly connected to the valve seat 8 by welding or other connection methods and forms the lower part of the valve cavity. The upper part of the valve cavity formed by the connection between the valve body 6 and the cover body 1 is connected to the lower part of the valve cavity formed by the connection between the valve body 6 and the valve seat 8, and together constitute the valve cavity. In addition, a first channel hole for forming the first channel is arranged on the side wall of the valve body 6, and the first channel hole is connected to the valve cavity, so that the first channel and the valve cavity are always kept connected.

[0048] In one embodiment, the material of the valve needle 7 includes but is not limited to metal material. The valve needle 7 is a rotating body structure, and the rotation center of the valve needle 7 coincides with the rotation center of the screw 4. As shown in Figure 4, the valve needle 7 includes a screw pressure head 71, a valve needle pressure ring 72, a valve needle spring 73 and a valve needle gasket 74. The first end of the screw pressure head 71 extends into the screw cavity of the screw 4. The screw pressure head 71 and the screw 4 can be fixedly connected by welding or the like, or can be detachably connected by bolts or the like. This application does not impose any restrictions on this. The second end of the screw pressure head 71 has a flange portion, and the second end of the screw pressure head 71 extends into the valve needle cavity. The valve needle pressure ring 72 is arranged between the first end and the second end of the screw pressure head 71 to prevent the flange portion of the second end of the screw pressure head 71 from escaping from the valve needle cavity. The valve needle spring 73 can be made of metal material to provide a stable positive sealing pressure for the contact between the valve needle 7 and the valve seat 8. The valve needle washer 74 is located at the bottom of the valve needle spring 73 and can be made of a self-lubricating material such as polytetrafluoroethylene (PTFE) to reduce friction with the valve needle spring 73. The valve needle washer 74 is a rotating body structure, and its rotation center coincides with the rotation center of the screw 4.

[0049] In one embodiment, the material of the valve seat 8 includes but is not limited to metal materials. The valve seat 8 is a rotating body structure, and the rotation center of the valve seat 8 coincides with the rotation center of the screw 4. The second channel hole for forming the second channel is arranged in the middle area of ​​the valve seat 8, and the second channel hole is connected to the valve cavity. Specifically, the second channel hole is formed by the intersection of two straight lines on the upper part and a circular arc on the lower part, and the material is cut out by rotation. When the rotor 2 drives the screw 4 to rotate, and then drives the valve needle 7 to move linearly in the axial direction, the second channel hole can be opened or closed. When the second channel hole is closed, the second channel is not connected to the valve cavity. When the second channel hole is open, the second channel is connected to the valve cavity. At this time, the valve cavity, the first channel, and the second channel are connected to each other.

[0050] In one embodiment, as shown in FIG1 , the expansion valve further includes a sealing ring. The sealing ring includes a first sealing ring disposed at the lower portion of the valve body 6 and a second sealing ring disposed at the lower portion of the valve seat 8 . The first sealing ring and the second sealing ring cooperate to isolate the first channel hole from the second channel hole.

[0051] In one embodiment, when the external coil is pulsed with power, rotor 2 rotates under the influence of the magnetic field, driving screw 4. The externally threaded section of screw 4 cooperates with the internally threaded section of valve core 5, converting the rotational motion of rotor 2 into axial linear motion of screw 4. Guide channels are provided above and below the threaded pair to prevent excessive deflection of the screw and rotor. The axial motion of screw 4 drives the axial motion of valve needle 7, causing it to contact or separate from the valve seat, thereby opening or closing the second passage of the valve chamber.

[0052] The present application also provides a vehicle air conditioner, comprising the expansion valve as described above.

[0053] The present application also provides a vehicle comprising the vehicle air conditioner as described above.

[0054] According to the valve core assembly, expansion valve and vehicle air conditioner provided by the present application, by arranging a first through hole section, a second through hole section and an internal thread section located between the first through hole section and the second through hole section in the valve core, and arranging a first guide section, a second guide section and an external thread section located between the first guide section and the second guide section outside the screw, when the valve core and the screw thread are matched, axial guides are provided above and below the thread pair to prevent excessive deflection of the screw and the rotor, thereby reducing the noise of the expansion valve and improving the flow control accuracy of the expansion valve.

[0055] The present application has been described through the above-described embodiments, but it should be understood that the above-described embodiments are for illustrative and illustrative purposes only and are not intended to limit the present application to the described embodiments. In addition, it will be understood by those skilled in the art that the present application is not limited to the above-described embodiments, and that various variations and modifications may be made based on the teachings of the present application, all of which fall within the scope of protection claimed in the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A valve core assembly, characterized in that: include: A valve core (5), wherein a valve core inner hole (50) is formed in the valve core (5), and the valve core inner hole (50) comprises a first through hole section (51), a second through hole section (52), and an internal thread section (53) located between the first through hole section (51) and the second through hole section (52); A screw rod (4), wherein the screw rod (4) passes through the inner hole (50) of the valve core, the screw rod (4) comprises a rotor fitting portion, a valve needle fitting portion and a valve core fitting portion arranged between the rotor fitting portion and the valve needle fitting portion, the rotor fitting portion is used to connect with the rotor (2), the valve needle fitting portion is used to connect with the valve needle (7), and the valve core fitting portion comprises a first guide section (41), a second guide section (42) and an external thread section (43) located between the first guide section (41) and the second guide section (42); The first through hole section (51) cooperates with the first guide section (41) along the axial guiding of the screw rod (4), the second through hole section (52) cooperates with the second guide section (42) along the axial guiding of the screw rod (4), the internal thread section (53) cooperates with the external thread section (43), the gap between the first guide section (41) and the inner wall of the first through hole section (51) is smaller than the gap between the external thread section (43) and the internal thread section (53), and the gap between the second guide section (42) and the inner wall of the second through hole section (52) is smaller than the gap between the external thread and the internal thread section (53).

2. The valve core assembly according to claim 1, characterized in that: The difference between the gap between the external thread section (43) and the internal thread section (53) and the gap between the second guide section (42) and the inner wall of the second through hole section (52) is in the range of 0.03 mm to 0.05 mm, the gap between the first guide section (41) and the inner wall of the first through hole section (51) is in the range of 0.01 mm to 0.03 mm, the gap between the second guide section (42) and the inner wall of the second through hole section (52) is in the range of 0.03 mm to 0.05 mm, and the gap between the external thread section (43) and the internal thread section (53) is in the range of 0.05 mm to 0.08 mm.

3. The valve core assembly according to any one of claims 1 to 2, characterized in that: The valve core (5) is provided with a valve core internal connection piece (54), and a positioning hole (55) is provided on the valve core internal connection piece (54). The valve core (5) is made of an injection molding material, and the valve core internal connection piece (54) is made of a metal material, and the injection molding material includes polyetheretherketone.

4. An expansion valve, characterized in that: include: The valve core assembly according to any one of claims 1 to 3; A housing assembly, wherein the housing assembly is formed with an internal space, a first channel and a second channel, and the valve core (5) is riveted to the housing assembly; a valve needle (7), the valve needle (7) being movably disposed in the internal space, the valve needle (7) being connected to the screw rod (4); A rotor (2) is used to drive the screw (4) to rotate relative to the valve core (5), thereby driving the valve needle (7) to move to adjust the fluid flow between the second channel and the internal space.

5. The expansion valve according to claim 4, characterized in that: The housing assembly comprises: A valve body (6), wherein the valve body (6) is fixedly connected to the valve core (5); A cover body (1), the cover body (1) is arranged on the outer side of the rotor (2), the lower end of the cover body (1) is fixedly connected to the valve body (6), and the cover body (1) and the valve body (6) are interference-fitted to form the upper part of the internal space; A valve seat (8), wherein the valve seat (8) is fixedly connected to the valve body (6), the valve seat (8) and the valve body (6) are interference fit to form the lower part of the internal space, and the upper part of the internal space is connected to the lower part of the internal space to form a valve cavity.

6. The expansion valve according to claim 5, characterized in that: A first channel hole for forming the first channel is arranged on the side wall of the valve body (6), and a second channel hole for forming the second channel is arranged in the middle area of ​​the valve seat (8).

7. The expansion valve according to claim 6, characterized in that The rotor mating portion of the screw rod (4) is fixedly connected to the rotor (2), and the rotor (2) is sleeved on the outer side of the valve core (5). When the rotor (2) rotates, the screw rod (4) is driven to rotate. The external thread section (43) and the internal thread section (53) cooperate to form a thread pair, which converts the rotational motion of the rotor (2) into axial linear motion of the valve needle (7), so that the second channel hole is opened or closed.

8. The expansion valve according to any one of claims 6 to 7, characterized in that: The valve needle mating portion of the screw rod (4) is provided with a screw cavity, the first end of the screw pressure head (71) of the valve needle (7) extends into the screw cavity to be fixedly connected or detachably connected to the screw rod (4), the flange portion of the second end of the screw pressure head (71) extends into the valve needle cavity of the valve needle (7), and the valve needle cavity is connected to the valve cavity.

9. The expansion valve according to claim 8, characterized in that The valve needle chamber is provided with a valve needle spring (73), and the valve needle spring (73) is in a compressed state.

10. A vehicle air conditioner, characterized in that: The invention comprises an expansion valve according to any one of claims 4 to 9.

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