Valve needle structure and electronic expansion valve having the same

Abstract

The utility model discloses a valve needle structure and electronic expansion valve with it, valve needle structure includes: first valve needle, first valve needle has the accommodation cavity, screw rod, screw rod extends along the axial direction of first valve needle, and one end of screw rod length direction stretches into the accommodation cavity, bearing assembly, bearing assembly includes bearing body and convex part, and bearing body is sleeved on screw rod, and convex part is sleeved on bearing body outside and extends along the circumferential direction of bearing body, and convex part is located in the accommodation cavity, elastic part, elastic part is located in the accommodation cavity, and one end of elastic part length direction is with the inside wall of the side of accommodation cavity away from screw rod and resists, and the other end is with the convex part and resists, for driving bearing assembly moves to the direction of the inside wall of the side of accommodation cavity away from screw rod and resists. According to the utility model's valve needle structure, can increase the abutment area of elastic part and bearing assembly, guarantee the stability of elastic part work, and need not to increase additional parts and components, avoid increasing assembly process, reduce assembly difficulty.

Description

Technical Field

[0001] This utility model relates to the field of refrigerant control element technology, and in particular to a valve needle structure and an electronic expansion valve having the same. Background Technology

[0002] With the rapid development of the automotive industry, automobiles are equipped with an increasing number of devices and functions, making valves, as the medium connecting multiple flow paths, increasingly important in the automobile manufacturing process. In existing technologies, due to considerations of flow control accuracy, the internal structure of valves is becoming increasingly complex, increasing the difficulty of valve assembly. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a valve needle structure that requires no additional components, avoids additional assembly steps, reduces assembly difficulty, and lowers production and assembly costs.

[0004] This utility model also proposes an electronic expansion valve, which includes the valve needle structure described above.

[0005] The valve needle structure according to an embodiment of the present invention includes: a first valve needle having a receiving cavity; a screw extending along the axial direction of the first valve needle, with one end of the screw extending into the receiving cavity along its length; a bearing assembly including a bearing body and a protrusion, the bearing body being sleeved on the screw, the protrusion being sleeved outside the bearing body and extending along the circumferential direction of the bearing body, the protrusion being located within the receiving cavity; and an elastic element disposed within the receiving cavity, one end of the elastic element abutting against the inner wall of the receiving cavity on the side away from the screw, and the other end abutting against the protrusion, for driving the bearing assembly to move toward the inner wall of the receiving cavity on the side away from the screw.

[0006] According to the embodiment of the present utility model, the valve needle structure includes a first valve needle, a screw, a bearing assembly, and an elastic element. The bearing assembly includes a bearing body and a protrusion. The protrusion is sleeved outside the bearing body and extends along the circumferential direction of the bearing body, which can increase the contact area between the elastic element and the bearing assembly, ensure that the end face of the elastic element has sufficient contact space, ensure the stability of the elastic element's operation, and eliminate the need for additional parts. This avoids increasing the assembly process of the valve needle structure, reduces the assembly difficulty of the valve needle structure, and lowers the production and assembly costs of the valve needle structure.

[0007] In addition, the valve needle structure of this utility model may also have the following additional technical features: In some embodiments, the protrusion extends in a ring shape along the circumferential direction of the bearing body; or, the protrusion extends in an open ring shape along the circumferential direction of the bearing body; or, the protrusion includes a plurality of sub-protrusions, the plurality of sub-protrusions being spaced apart along the circumferential direction of the bearing body, and the elastic member being adapted to abut against at least one of the plurality of sub-protrusions.

[0008] In some embodiments, the protrusion and the outer ring of the bearing body are integrally formed; or, the protrusion and the outer ring of the bearing body are separately machined parts.

[0009] In some embodiments, the protrusion is connected to one axial end of the bearing body along the axial direction of the first valve needle.

[0010] In some embodiments, the bearing body is located within the receiving cavity, and the first valve needle includes a first component and a second component, the first component defining a mounting cavity having an opening at one end along the axial direction of the first valve needle, and the second component covering the opening to jointly define the receiving cavity with the first component.

[0011] In some embodiments, the first component includes a guide sleeve and a needle body, the guide sleeve defining the mounting cavity, the screw extending into the mounting cavity through the opening, the needle body being connected to the end of the guide sleeve opposite to the screw, the second component being formed as a retaining ring surrounding the screw and fixed at the opening, and the bearing assembly being movably disposed within the receiving cavity along the axial direction of the first valve needle; or, the first component being formed as a guide sleeve defining the mounting cavity, one end of the screw extending into the guide sleeve along its length, the end of the mounting cavity opposite to the screw having the opening, the second component including a needle body and a retaining ring, the retaining ring being sleeved on the needle body for fixing the needle body at the opening, and the bearing assembly being movably disposed within the receiving cavity along the axial direction of the first valve needle.

[0012] In some embodiments, the first valve needle has a mating hole on its axial end face, the mating hole communicating with the receiving cavity, the screw extending into the receiving cavity from the mating hole, the bearing body passing through the mating hole, the protrusion connected to one end of the bearing body located in the receiving cavity, and the protrusion adapted to abut against the inner wall of the receiving cavity near the screw.

[0013] This utility model also provides an electronic expansion valve having the above-described embodiments.

[0014] According to the embodiment of the present invention, the electronic expansion valve, by providing the above-mentioned valve needle structure, includes a first valve needle, a screw, a bearing assembly, and an elastic element. The bearing assembly includes a bearing body and a protrusion. The protrusion is sleeved outside the bearing body and extends along the circumferential direction of the bearing body, which can increase the contact area between the elastic element and the bearing assembly, ensure that the end face of the elastic element has sufficient contact space, ensure the stability of the elastic element's operation, and eliminate the need for additional parts. This avoids increasing the assembly process of the valve needle structure, reduces the assembly difficulty of the valve needle structure, and lowers the production and assembly costs of the valve needle structure.

[0015] In some embodiments, the electronic expansion valve further includes: a housing having a first cavity, a second cavity, a first communicating hole, and a first valve port, the first cavity and the second cavity being arranged in the axial direction of the housing, the first communicating hole being disposed on the peripheral wall of the first cavity and communicating with the first cavity, and the first valve port being disposed at one end of the first cavity opposite to the second cavity; and a second valve needle disposed within the housing and partially extending into the first cavity, the second valve needle being movable along the axial direction of the housing to open or close the first valve port, the second valve needle having a first... The housing has three chambers. The second valve needle has a second valve port communicating with the third chamber on its axial end face away from the second chamber. The peripheral wall of the second valve needle has a second communication hole communicating with the third chamber and the first chamber. The valve needle structure passes through the second valve needle and is movable along the axial direction of the housing. A portion of the first valve needle is disposed in the third chamber to open or close the second valve port. The axial direction of the first valve needle is the same as the axial direction of the housing. A drive assembly is disposed on the housing and is used to drive the screw to move along the axial direction of the housing.

[0016] In some embodiments, the electronic expansion valve further includes: a housing having a first cavity, a second cavity, a first communicating hole, and a first valve port, the first cavity and the second cavity being arranged in the axial direction of the housing, the first communicating hole being disposed on the peripheral wall of the first cavity and communicating with the first cavity, the first valve port being disposed at one end of the first cavity opposite to the second cavity, the valve needle structure being disposed within the housing, and a portion of the first valve needle extending into the first cavity for opening or closing the first valve port, the axial direction of the first valve needle being the same as the axial direction of the housing; and a drive assembly disposed on the housing for driving the screw to move along the axial direction of the housing.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of an electronic expansion valve according to an embodiment of the present utility model; Figure 2 This is a cross-sectional view of the electronic expansion valve according to the first embodiment of the present invention; Figure 3 This is a perspective view of the valve needle structure according to the first embodiment of the present utility model; Figure 4 This is a cross-sectional view of the valve needle structure according to the first embodiment of the present utility model; Figure 5 This is a cross-sectional view of the valve needle structure according to the second embodiment of the present utility model; Figure 6 This is a cross-sectional view of the valve needle structure according to the third embodiment of the present utility model; Figure 7 This is a cross-sectional view of the electronic expansion valve according to the fourth embodiment of the present invention.

[0019] Figure label: 100. Electronic expansion valve; 1. Valve needle structure; 11. First valve needle; 110. Receiving cavity; 111. First component; 112. Second component; 113. Guide sleeve; 114. Needle body; 115. Retaining ring; 116. Retaining ring; 117. Second limiting structure; 118. Notch; 12. Screw; 13. Bearing assembly; 131. Bearing body; 132. Protrusion; 14. Elastic element; 2. Housing; 21. First cavity; 22. Second cavity; 23. First connecting hole; 24. First valve port; 241. Sealing gasket; 3. Second valve needle; 31. Third cavity; 32. Second valve port; 33. Second connecting hole; 34. First flow channel; 341. First limiting structure; 4. Drive assembly; 41. Coil assembly; 42. Rotor assembly; 43. Guide component; 44. Nut; 5. Second elastic element. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The valve needle structure 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0025] like Figure 2 and Figure 4 As shown, the valve needle structure 1 according to an embodiment of the present invention includes a first valve needle 11, a screw 12, a bearing assembly 13, and an elastic element 14.

[0026] Specifically, see the attached document. Figure 4 As shown, the first valve needle 11 is along the a direction (e.g.) Figure 4As shown, the first valve needle 11 extends along the axial direction of the first valve needle 11, with one end of the screw 12 extending into the cavity 110. The screw 12 is rotatable relative to the first valve needle 11. The bearing assembly 13 is located within the cavity 110 and includes a bearing body 131 and a protrusion 132. The bearing body 131 is sleeved on the screw 12, and the protrusion 132 is sleeved outside the bearing body 131 and extends along the circumferential direction of the bearing body 131. The protrusion 132 is located within the cavity 110. The inner ring of the bearing body 131 is fixedly connected to the screw 12, and the protrusion 132 is fixed on the outer ring of the bearing body 131. The bearing assembly 13 and the screw 12 move synchronously in the axial direction of the first valve needle 11.

[0027] Further, see Appendix Figure 4 As shown, the elastic element 14 is disposed within the receiving cavity 110. One end of the elastic element 14 in the longitudinal direction abuts against the inner wall of the receiving cavity 110 away from the screw 12, and the other end abuts against the protrusion 132. It is used to drive the bearing assembly 13 to move in the direction away from the inner wall of the receiving cavity 110 away from the screw 12, or in other words, to drive the first valve needle 11 to move in the direction away from the screw 12, thereby ensuring that the first valve needle 11 is aligned with the valve port of the electronic expansion valve 100 (e.g., Figure 2 The sealing performance of the second valve port 32 shown in the figure.

[0028] In related technologies, the spring is supposed to abut against the outer ring of the bearing. However, in actual implementation, due to the small size of the bearing, the contact area between the outer ring of the bearing and the spring is too small. The spring is prone to slipping off the contact position and falling onto the bearing seal, applying force to the bearing seal and damaging the bearing.

[0029] The present invention provides a protrusion 132 on the outside of the bearing body 131, which extends along the circumferential direction of the bearing body 131. The elastic member 14 abuts against the protrusion 132, which increases the contact area between the elastic member 14 and the bearing assembly 13, ensuring that the end face of the elastic member 14 has sufficient contact space, ensuring the stability of the elastic member 14 in operation. Furthermore, it eliminates the need for additional parts, avoids increasing the assembly process of the valve needle structure 1, and reduces the production and assembly costs of the valve needle structure 1.

[0030] According to the embodiment of the present utility model, the valve needle structure 1 includes a first valve needle 11, a screw 12, a bearing assembly 13, and an elastic element 14. The bearing assembly 13 includes a bearing body 131 and a protrusion 132. The protrusion 132 is sleeved outside the bearing body 131 and extends along the circumferential direction of the bearing body 131, which can increase the contact area between the elastic element 14 and the bearing assembly 13, ensure that the end face of the elastic element 14 has sufficient contact space, ensure the stability of the operation of the elastic element 14, and eliminate the need for additional parts. This avoids increasing the assembly process of the valve needle structure 1, reduces the assembly difficulty of the valve needle structure 1, and reduces the production and assembly costs of the valve needle structure 1.

[0031] In some embodiments of this utility model, reference is made to the appendix. Figure 4 As shown, the protrusion 132 extends in a ring shape along the circumferential direction of the bearing body 131, which simplifies the structure of the protrusion 132, facilitates its production and processing, reduces the production and processing difficulty of the bearing assembly 13, and ensures the contact effect between the protrusion 132 and the elastic element 14, further ensuring the stability of the elastic element 14 during operation. For example, when the bearing assembly 13 is directly selected as a flange bearing, the flange edge is formed as the protrusion 132.

[0032] Alternatively, the protrusion 132 can extend in an open ring along the circumferential direction of the bearing body 131, which facilitates the assembly of the protrusion 132 onto the bearing body 131 and reduces the assembly difficulty of the bearing assembly 13. For example, when the bearing assembly 13 is directly selected as a stop ring bearing, the stop ring becomes the protrusion 132.

[0033] Alternatively, the protrusion 132 may include a plurality of sub-protrusions spaced apart along the circumferential direction of the bearing body 131. The elastic member 14 is adapted to abut against at least one of the sub-protrusions, which can relatively save material for the protrusion 132, reduce the manufacturing cost of the bearing assembly 13, and lower the total cost of the valve needle structure 1. For example, the sub-protrusions may be two, three, four, or five spaced apart along the circumferential direction of the bearing body 131, with each sub-protrusion extending along the circumferential direction of the bearing body 131.

[0034] In some embodiments of this utility model, the protrusion 132 and the outer ring of the bearing body 131 are integrally formed. On the one hand, this can ensure the reliability of the connection between the protrusion 132 and the outer ring of the bearing body 131, and avoid the formation of structural weaknesses at the connection between the protrusion 132 and the outer ring of the bearing body 131. On the other hand, it can simplify the assembly process, avoid additional errors that may be introduced during the assembly of the split structure, and improve the product consistency of the valve needle structure 1.

[0035] Alternatively, the protrusion 132 and the outer ring of the bearing body 131 can be machined separately. The protrusion 132 and the outer ring of the bearing body 131 can be fixed by means of threads, slots, fasteners or welding. This allows for adjustment of the axial position of the protrusion 132 on the bearing body 131 during assembly. Furthermore, the protrusion 132 can be assembled onto the bearing body 131 after the bearing body 131 is assembled onto the screw 12. This allows for the separate assembly of the protrusion 132, avoiding assembly difficulties caused by interference from the protrusion 132 during one-piece molding. At the same time, if the protrusion 132 is damaged or its axial position needs to be adjusted, the separate design allows for the replacement of the protrusion 132 separately without replacing the entire outer ring of the bearing body 131, reducing the maintenance cost and time of the bearing assembly 13.

[0036] In a specific example, the protrusion 132 and the outer ring of the bearing body 131 are separate machined parts. The outer peripheral wall of the bearing body 131 has a mounting groove. The mounting groove extends along the circumferential direction of the bearing body 131 and along the axial direction of the first valve needle 11. The mounting groove is spaced apart from the two ends of the bearing body 131 in the axial direction. The protrusion 132 is engaged in the mounting groove.

[0037] In some embodiments of this utility model, reference is made to the appendix. Figure 4 Appendix Figure 5 and attached Figure 6 As shown, along the axial direction of the first valve needle 11, the protrusion 132 is connected to one axial end of the bearing body 131. It can be understood that, along the axial direction of the first valve needle 11, the protrusion 132 can be connected to the end of the bearing body 131 near the elastic element 14, or it can be connected to the end of the bearing body 131 away from the elastic element 14. This simplifies the installation and positioning process of the bearing assembly 13, and the protrusion 132 can be used as an installation reference surface during assembly, reducing assembly errors. It should be noted that, depending on the different compression requirements of the elastic element 14 for different valve needle structures 1, the protrusion 132 can be designed at different positions on the bearing body 131, thereby meeting different user needs.

[0038] Of course, this utility model is not limited to this. Along the axial direction of the first valve needle 11, the protrusion 132 can be connected to any position of the bearing body 131 to meet the different requirements of different valve needle structures 1 for the compression amount of the elastic element 14.

[0039] In some embodiments of this utility model, reference is made to the appendix. Figure 4As shown, the bearing body 131 is located in the receiving cavity 110. The first valve needle 11 includes a first component 111 and a second component 112. The first component 111 defines the mounting cavity, and one end of the mounting cavity along the axial direction of the first valve needle 11 has an open opening. The second component 112 is covered at the open opening to jointly define the receiving cavity 110 with the first component 111. It can be understood that since the bearing assembly 13 is sleeved on one end of the screw 12 along its length, and the end of the screw 12 with the bearing assembly 13 sleeved needs to extend into the receiving cavity 110, by designing the first component 111 and the second component 112 separately, on the one hand, it can facilitate the production and processing of the first valve needle 11. On the other hand, the bearing assembly 13 and one end of the screw 12 can be assembled into the mounting cavity first, and then the mounting cavity can be sealed with the second component 112, which facilitates the assembly of the screw 12 and the bearing assembly 13 onto the first valve needle 11 and reduces the overall assembly difficulty of the valve needle structure 1.

[0040] In a further embodiment of this utility model, reference is made to the appendix. Figure 4 As shown, the first component 111 includes a guide sleeve 113 and a needle body 114. The guide sleeve 113 defines an installation cavity. The screw 12 extends into the installation cavity through an open opening. The needle body 114 is connected to the end of the guide sleeve 113 facing away from the screw 12. The second component 112 is formed as a retaining ring 115. The retaining ring 115 surrounds the screw 12 and is fixed at the open opening. The bearing assembly 13 is movably disposed in the receiving cavity 110 along the axial direction of the first valve needle 11. The retaining ring 115 can be used to seal the open opening of the installation cavity. During the assembly process of the valve needle structure 1, the elastic element 14 can be placed into the installation cavity first. Then, the assembled bearing assembly 13 and the screw 12 are placed into the installation cavity from top to bottom. Finally, the retaining ring 115 on the screw 12 is welded to the guide sleeve 113. This can limit the bearing assembly 13 with the retaining ring 115, preventing the bearing assembly 13 from coming out in the direction away from the elastic element 14, and ensuring the connection reliability of the valve needle structure 1.

[0041] Alternatively, refer to the appendix. Figure 5 and attached Figure 6As shown, the first component 111 is formed as a guide sleeve 113, which defines the mounting cavity. One end of the screw 12 extends into the guide sleeve 113 along its length. The end of the mounting cavity opposite to the screw 12 has an open opening. The second component 112 includes a needle body 114 and a retaining ring 116. The retaining ring 116 is sleeved on the needle body 114 and is used to fix the needle body 114 at the open opening. The bearing assembly 13 is movably disposed in the receiving cavity 110 along the axial direction of the first valve needle 11. During the assembly process of the valve needle structure 1, the assembled bearing assembly 13 and the screw 12 are first placed into the mounting cavity from bottom to top. Then, the elastic element 14 is placed into the mounting cavity and abuts against the protrusion 132. Finally, the retaining ring 116 is welded to the guide sleeve 113. This can limit the position of the retaining ring 116 on the elastic element 14, preventing the elastic element 14 from coming out in the direction away from the bearing assembly 13, and ensuring the connection reliability of the valve needle structure 1.

[0042] In a further embodiment of this utility model, reference is made to the appendix. Figure 7 As shown, the first valve needle 11 has a mating hole on its axial end face, which communicates with the receiving cavity 110. The screw 12 extends into the receiving cavity 110 through the mating hole, and the bearing body 131 passes through the mating hole. The protrusion 132 is connected to one end of the bearing body 131 located in the receiving cavity 110. The protrusion 132 is adapted to abut against the inner wall of the receiving cavity 110 near the screw 12. During the process of the valve needle structure 1 opening the valve port, the screw 12 drives the bearing assembly 13 to move in the direction away from the valve port. By abutting against the inner wall of the receiving cavity 110 near the screw 12, the protrusion 132 can drive the entire first valve needle 11 to move in the direction away from the valve port, thereby realizing the normal opening of the electronic expansion valve 100. This can improve the flexibility and freedom of the first valve needle 11 while ensuring the normal opening of the first valve needle 11.

[0043] It should be noted that the reference appendix... Figure 7 As shown, the first valve needle 11 includes a first component 111 and a second component 112 fixedly connected. The first component 111 is located on the side of the second component 112 away from the screw 12. The first component 111 defines a mounting cavity. One end of the mounting cavity along the axial direction of the first valve needle 11 has an open opening. The second component 112 is covered at the open opening to define a receiving cavity 110 together with the first component 111. The bearing body 131 is movably inserted into the mating hole along the axial direction of the first valve needle 11. The inner ring of the bearing body 131 is fixed to the screw 12.

[0044] This utility model also proposes an electronic expansion valve 100 having the valve needle structure 1 of the above embodiments.

[0045] According to the embodiment of the present invention, the electronic expansion valve 100 is provided with the above-mentioned valve needle structure 1. The valve needle structure 1 includes a first valve needle 11, a screw 12, a bearing assembly 13, and an elastic element 14. The bearing assembly 13 includes a bearing body 131 and a protrusion 132. The protrusion 132 is sleeved outside the bearing body 131 and extends along the circumferential direction of the bearing body 131. This can increase the contact area between the elastic element 14 and the bearing assembly 13, ensure that the end face of the elastic element 14 has sufficient contact space, and ensure the stability of the operation of the elastic element 14. Furthermore, no additional parts are required, which can avoid increasing the assembly process of the valve needle structure 1, reduce the assembly difficulty of the valve needle structure 1, and reduce the production and assembly costs of the valve needle structure 1.

[0046] In some embodiments of this utility model, reference is made to the appendix. Figure 2 As shown, the electronic expansion valve 100 also includes a housing 2, a second valve needle 3, and a drive assembly 4. For details, please refer to the attached diagram. Figure 1 As shown, the housing 2 protects the internal structure of the electronic expansion valve 100, which helps extend the service life of the electronic expansion valve 100. The housing 2 has a first cavity 21, a second cavity 22, a first connecting hole 23, and a first valve port 24. The first cavity 21 and the second cavity 22 are in the axial direction of the housing 2 (see attached diagram). Figure 2 Arranged in the direction shown (a), the first connecting hole 23 is provided on the peripheral wall of the first cavity 21 and communicates with the first cavity 21, and the first valve port 24 is provided at the end of the first cavity 21 away from the second cavity 22. The medium can flow into the first cavity 21 through one of the first connecting hole 23 and the first valve port 24, and flow out through the other of the first connecting hole 23 and the first valve port 24.

[0047] Further, see Appendix Figure 2 As shown, the second valve needle 3 is located inside the housing 2 and partially extends into the first cavity 21. The second valve needle 3 extends along the axial direction of the housing 2 and is movable along the axial direction of the housing 2 to open or close the first valve port 24. When the second valve needle 3 blocks the first valve port 24, the first connecting hole 23 and the first valve port 24 are no longer connected, the medium cannot flow into the first cavity 21 from the first valve port 24, and the medium in the first cavity 21 cannot flow out from the first valve port 24.

[0048] Furthermore, see the attached document. Figure 2As shown, the second valve needle 3 has a third cavity 31. The axial end face of the second valve needle 3 opposite to the second cavity 22 has a second valve port 32 communicating with the third cavity 31. The second valve port 32 is coaxially arranged with the first valve port 24. The peripheral wall of the second valve needle 3 has a second connecting hole 33 communicating with the third cavity 31 and the first cavity 21. The medium can enter the first cavity 21 through the first connecting hole 23 and flow into the third cavity 31 through the second connecting hole 33. Finally, it flows out of the electronic expansion valve 100 through the second valve port 32 and the first valve port 24 in sequence. Alternatively, the medium can enter the third cavity 31 through the first valve port 24 and the second valve port 32 in sequence, then flow out of the third cavity 31 through the second connecting hole 33 and enter the first cavity 21, and finally flow out of the electronic expansion valve 100 through the first connecting hole 23.

[0049] Furthermore, see the attached document. Figure 2 As shown, the valve needle structure 1 passes through the second valve needle 3 and is movable along the axial direction of the housing 2. A portion of the first valve needle 11 is disposed within the third cavity 31 to open or close the second valve port 32. The axial direction of the first valve needle 11 is the same as the axial direction of the housing 2. When the first valve needle 11 blocks the second valve port 32, the second connecting hole 33 and the second valve port 32 are no longer connected, and the medium cannot flow from the second valve port 32 into the third cavity 31, nor can the medium in the third cavity 31 flow out from the second valve port 32. It should be noted that the second valve needle 3 can guide the first valve needle 11, improving the sealing performance of the first valve needle 11 for the second valve port 32.

[0050] It is understandable that by providing a second valve port 32 and a first valve needle 11 for blocking the second valve port 32 within the second valve needle 3, when the second valve needle 3 blocks the first valve port 24, precise control of the electronic expansion valve 100 in the low flow stage can be achieved by adjusting the cooperation between the first valve needle 11 and the second valve port 32. This reduces flow lag during the switching process, lowers the fluctuation range of flow, reduces leakage, and improves the performance of the electronic expansion valve 100. Furthermore, when the first valve needle 11 opens the second valve port 32 and the second valve needle 3 opens the first valve port 24, the opening degree of the electronic expansion valve 100 can be increased, reducing the impact of flow resistance on the system.

[0051] It should be noted that by setting the first valve needle 11 inside the second valve needle 3, the internal space of the electronic expansion valve 100 can be fully utilized, reducing the space occupied by the electronic expansion valve 100, shrinking the size of the electronic expansion valve 100, reducing the weight of the electronic expansion valve 100, and reducing the cost of the electronic expansion valve 100.

[0052] Further, see Appendix Figure 2As shown, the drive assembly 4 is mounted on the housing 2 and is used to drive the screw 12 to move along the axial direction of the housing 2. The drive assembly 4 includes a coil component 41, a rotor component 42, a guide 43, and a nut 44. The coil component 41 is sleeved outside the housing 2, and the rotor component 42 is located inside the housing 2. The coil component 41 is located radially outside the rotor component 42 and is at least partially opposite to the rotor component 42, and is used to drive the rotor component 42 to rotate. The guide 43 is fixed inside the rotor component 42, and the nut 44 is fixed inside the housing 2. The screw 12 passes through the nut 44 and the guide 43 and its length direction (see attached figure) is [not specified]. Figure 2 One end of the rotor 12 (in the direction shown in a) is welded to the guide 43, so that the rotor 12, the guide 43 and the screw 12 rotate synchronously. Part of the screw 12 is threadedly connected to the nut 44. Since the screw 12 and the nut 44 form a threaded pair through threaded engagement, and the nut 44 is fixed inside the housing 2, the screw 12 needs to move along the axial direction of the housing 2 while rotating. The guide 43 and the rotor 12 move together with the screw 12 along the axial direction of the housing 2.

[0053] It is understandable that, such as Figure 2 As shown, when the coil component 41 is energized, the coil component 41 drives the rotor component 42 to rotate. Since the screw 12 is fixedly connected to the rotor component 42 through the guide 43, the rotor component 42 drives the screw 12 to rotate together. The screw 12 and the nut 44 are threaded together to form a threaded pair. The nut 44 is fixed on the housing 2, so that the screw 12 moves along the axial direction of the housing 2, thereby driving the rotor component 42 to move along the axial direction of the housing 2. During the process of the rotor component 42 moving along the axial direction of the housing 2, at least a part of the rotor component 42 is opposite to the coil component 41 to ensure that the coil component 41 drives the rotor component 42 to rotate normally.

[0054] It is understandable that, such as Figure 2 As shown, when the coil component 41 is energized, the coil component 41 drives the rotor component 42 to rotate. Since the screw 12 is fixedly connected to the rotor component 42 through the guide 43, the rotor component 42 drives the screw 12 to rotate together. The screw 12 and the nut 44 are threaded together to form a threaded pair. The nut 44 is fixed on the housing 2, so that the screw 12 moves along the axial direction of the housing 2, thereby driving the rotor component 42 to move along the axial direction of the housing 2. During the process of the rotor component 42 moving along the axial direction of the housing 2, at least a part of the rotor component 42 is opposite to the coil component 41 to ensure that the coil component 41 drives the rotor component 42 to rotate normally.

[0055] In a further embodiment of this utility model, reference is made to the appendix. Figure 2As shown, a first flow channel 34 is provided on the end face of the second valve needle 3 facing away from the first valve port 24. A first limiting structure 341 is provided on the end of the first flow channel 34 away from the first valve port 24. The valve needle structure 1 passes through the first flow channel 34. A second limiting structure 117 is provided on the outer peripheral wall of the first valve needle 11. The second limiting structure 117 is located on the side of the first limiting structure 341 close to the first valve port 24, and the second limiting structure 117 is adapted to stop against the surface of the first limiting structure 341 facing the first valve port 24. When the second limiting structure 117 stops against the surface of the first limiting structure 341 facing the first valve port 24, the first valve needle 11 can drive the second valve needle 3 to move together in the direction away from the first valve port 24, thereby opening the first valve port 24. It should be noted that the opening limit of the first valve needle 11 can be adjusted by adjusting the matching distance between the second limiting structure 117 and the first limiting structure 341, thereby adjusting the flow curve of the electronic expansion valve 100.

[0056] In a specific example, see Appendix Figure 2 and attached Figure 3 As shown, the first limiting structure 341 is an annular shape extending circumferentially along the second valve needle 3. The first limiting structure 341 is press-fitted with and welded to the inner wall of the first flow channel 34. The first valve needle 11 and the first limiting structure 341 are spaced apart radially. The second limiting structure 117 extends circumferentially along the first valve needle 11. The outer peripheral wall of the second limiting structure 117 has a notch 118, which penetrates the second limiting structure 117 along the axial direction of the housing 2. It should be noted that the portion of the second limiting structure 117 without the notch 118 is connected to... There is a certain gap between the inner peripheral walls of the second valve needle 3, which allows the medium to pass through. The notch 118 can improve the efficiency of the medium flowing to the second cavity 22, ensure that the pressure in the second cavity 22 is consistent with that at the first valve port 24, and ensure that the electronic expansion valve 100 is always in a pressure balance state during the movement of the first valve needle 11 and the second valve needle 3. This avoids affecting the normal movement of the first valve needle 11 and the second valve needle 3 along the axial direction of the housing 2, and ensures the reliability and stability of the second valve needle 3 blocking the first valve port 24 and the first valve needle 11 blocking the second valve port 32.

[0057] Furthermore, the notches 118 are multiple and spaced apart along the circumferential direction of the second limiting structure 117, which can further improve the efficiency of the medium flowing to the second cavity 22, ensure that the pressure at the second cavity 22 and the first valve port 24 is consistent, and ensure that the electronic expansion valve 100 is always in a pressure balance state during the movement of the first valve needle 11 and the second valve needle 3, so as to avoid affecting the normal movement of the first valve needle 11 and the second valve needle 3 along the axial direction of the housing 2, and ensure the reliability and stability of the second valve needle 3 blocking the first valve port 24 and the first valve needle 11 blocking the second valve port 32. For example, the notches 118 can be two, three, four, five or six spaced apart along the circumferential direction of the second limiting structure 117.

[0058] Of course, this utility model is not limited to this. The second limiting structure 117 can also be a lug formed on the outer peripheral wall of the first valve needle 11, the first flow channel 34 is a guide groove that matches the lug and extends along the axial direction of the housing 2, and the first limiting structure 341 is a protrusion provided at the end of the guide groove that is away from the first valve port 24. It can also achieve the effect of the first valve needle 11 driving the second valve needle 3 to move together in the direction away from the first valve port 24 and opening the first valve port 24.

[0059] It should be noted that the reference appendix... Figure 2 As shown, a sealing gasket 241 is provided inside the first valve port 24. The sealing gasket 241 extends in an annular shape along the circumferential direction of the first valve port 24. The second valve needle 3 is adapted to abut against the sealing gasket 241 to block the first valve port 24. Through the cooperation of the sealing gasket 241 and the second valve needle 3, the sealing effect of the second valve needle 3 on the first valve port 24 can be improved, ensuring the reliability of the second valve needle 3 in blocking the first valve port 24, and preventing the inflow or outflow of the medium when the second valve needle 3 blocks the first valve port 24.

[0060] Furthermore, the sealing gasket 241 is a plastic part, which has good elasticity, light weight, good corrosion resistance, good wear resistance, high strength, and low cost. Specifically, PTFE (polytetrafluoroethylene), PPS (polyphenylene sulfide), PEI (polyethyleneimine), or HNBR (hydrogenated nitrile butadiene rubber) are preferred. Alternatively, the sealing gasket 241 can be obtained by adding carbon fiber, glass fiber, carbon powder, etc. to the above materials, which can further improve the structural strength and hardness of the sealing gasket 241.

[0061] In a further embodiment of this utility model, reference is made to the appendix. Figure 2 As shown, the electronic expansion valve 100 also includes a second elastic element 5, which is disposed within the second cavity 22 and is used to drive the second valve needle 3 to move toward the first valve port 24. It can be understood that the length direction of the second elastic element 5 (see attached diagram) Figure 2(Direction a) shown is the axial direction of the housing 2. The two ends of the second elastic element 5 in the length direction abut against the nut 44 and the second valve needle 3 respectively, which can ensure that the contact area at both ends of the second elastic element 5 in the length direction is sufficient, and ensure the reliability of the assembly of the second elastic element 5. The second elastic element 5 is always in a compressed state, which can provide a driving force to the second valve needle 3, driving the second valve needle 3 to move towards the direction close to the first valve port 24, which can ensure the sealing effect of the second valve needle 3 on the first valve port 24 when the second valve needle 3 blocks the first valve port 24.

[0062] In some embodiments of this utility model, reference is made to the appendix. Figure 7 As shown, the electronic expansion valve 100 also includes a housing 2 and a drive assembly 4. The housing 2 can protect the internal structure of the electronic expansion valve 100, which is beneficial to extending the service life of the electronic expansion valve 100. The housing 2 has a first cavity 21, a second cavity 22, a first connecting hole 23 and a first valve port 24. The first cavity 21 and the second cavity 22 are arranged in the axial direction of the housing 2. The first connecting hole 23 is provided on the peripheral wall of the first cavity 21 and communicates with the first cavity 21. The first valve port 24 is provided at the end of the first cavity 21 away from the second cavity 22. The medium can flow into the first cavity 21 through one of the first connecting hole 23 and the first valve port 24, and flow out through the other of the first connecting hole 23 and the first valve port 24.

[0063] Further, see Appendix Figure 7 As shown, the valve needle structure 1 is located inside the housing 2, and part of the first valve needle 11 extends into the first cavity 21 to open or close the first valve port 24. The axial direction of the first valve needle 11 is the same as the axial direction of the housing 2. When the first valve needle 11 closes the first valve port 24, the first connecting hole 23 and the first valve port 24 are no longer connected, and the medium cannot flow into the first cavity 21 from the first valve port 24, nor can the medium in the first cavity 21 flow out from the first valve port 24. The drive assembly 4 is located on the housing 2 and is used to drive the screw 12 to move along the axial direction of the housing 2.

[0064] Under the drive of the drive assembly 4, the screw 12 drives the first valve needle 11 to move along the axial direction of the housing 2. When the first valve needle 11 opens the first valve port 24, the medium can flow into the first cavity 21 from one of the first valve port 24 and the first connecting hole 23, and then flow from the first cavity 21 to the other of the first valve port 24 and the first connecting hole 23. When the first valve needle 11 closes the first valve port 24, the medium in the first cavity 21 cannot flow out from the first valve port 24, and the medium outside the electronic expansion valve 100 cannot flow into the first cavity 21 from the first valve port 24. By opening or closing the first valve port 24, different user needs can be met and the user experience can be improved.

[0065] The following is for reference. Figures 1 to 7 The electronic expansion valve 100 according to four specific embodiments of the present invention is described below. It is to be understood that the following description is merely exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0066] Example 1 Specifically, such as Figures 1 to 4 As shown, the electronic expansion valve 100 includes: a housing 2, a second valve needle 3, a valve needle structure 1, and a drive assembly 4.

[0067] Furthermore, the housing 2 has a first cavity 21, a second cavity 22, a first connecting hole 23, and a first valve port 24. The first cavity 21 and the second cavity 22 are arranged in the axial direction of the housing 2. The first connecting hole 23 is provided on the peripheral wall of the first cavity 21 and communicates with the first cavity 21. The first valve port 24 is provided at the end of the first cavity 21 opposite to the second cavity 22. The second valve needle 3 is provided in the housing 2 and partially extends into the first cavity 21. The second valve needle 3 is movable in the axial direction of the housing 2 to open or close the first valve port 24. The second valve needle 3 has a third cavity 31. The axial end face of the second valve needle 3 opposite to the second cavity 22 has a second valve port 32 communicating with the third cavity 31. The peripheral wall of the second valve needle 3 has a second connecting hole 33 communicating with the third cavity 31 and the first cavity 21.

[0068] Furthermore, the valve needle structure 1 is inserted into the second valve needle 3 and is movable along the axial direction of the housing 2. The valve needle structure 1 includes a first valve needle 11, a screw 12, a bearing assembly 13, and an elastic element 14. A portion of the first valve needle 11 is disposed within the third cavity 31 to open or close the second valve port 32. The axial direction of the first valve needle 11 is the same as the axial direction of the housing 2. The first valve needle 11 has a receiving cavity 110. The screw 12 extends along the axial direction of the first valve needle 11, and the end of the screw 12 near the first valve port 24 extends into the receiving cavity 110. The screw 12 is rotatable relative to the first valve needle 11. The bearing assembly 13 is located within the receiving cavity 110 and includes a bearing body 131 and a protrusion 1. 32. The bearing body 131 is sleeved on the screw 12. The protrusion 132 is sleeved outside the bearing body 131 and the protrusion 132 and the outer ring of the bearing body 131 are integrally formed. The protrusion 132 extends in a ring shape along the circumferential direction of the bearing body 131. Along the axial direction of the first valve needle 11, the protrusion 132 is connected to the end of the bearing body 131 away from the first valve port 24. The elastic member 14 is disposed in the receiving cavity 110. One end of the elastic member 14 in the length direction abuts against the inner wall of the receiving cavity 110 away from the screw 12, and the other end abuts against the protrusion 132, for driving the bearing assembly 13 to move in the direction away from the inner wall of the receiving cavity 110 away from the screw 12.

[0069] Furthermore, the first valve needle 11 includes a first component 111 and a second component 112. The first component 111 includes a guide sleeve 113 and a needle body 114. The guide sleeve 113 defines a mounting cavity. One end of the mounting cavity along the axial direction of the first valve needle 11 has an open opening. The screw 12 extends into the mounting cavity through the open opening. The needle body 114 is connected to the end of the guide sleeve 113 opposite to the screw 12. The second component 112 is formed as a retaining ring 115. The retaining ring 115 surrounds the screw 12 and is fixed at the open opening, so as to define a receiving cavity 110 together with the first component 111. The bearing assembly 13 is movably disposed in the receiving cavity 110 along the axial direction of the first valve needle 11.

[0070] Additionally, the drive assembly 4 is mounted on the housing 2 and is used to drive the screw 12 to move along the axial direction of the housing 2. The drive assembly 4 includes a coil component 41, a rotor component 42, a guide component 43, and a nut 44. The coil component 41 is sleeved outside the housing 2, and the rotor component 42 is located inside the housing 2. The coil component 41 is located radially outside the rotor component 42 and is at least partially opposite to the rotor component 42, and is used to drive the rotor component 42 to rotate. The guide component 43 is fixed inside the rotor component 42, and the nut 44 is fixed inside the housing 2. The screw 12 passes through the nut 44 and the guide 43, and one end of its length is welded to the guide 43, so that the rotor component 42, the guide 43 and the screw 12 rotate synchronously. Part of the screw 12 is threadedly connected to the nut 44. Since the screw 12 and the nut 44 form a threaded pair through threaded engagement, and the nut 44 is fixed inside the housing 2, the screw 12 also needs to move along the axial direction of the housing 2 while rotating. The guide 43 and the rotor component 42 move along the axial direction of the housing 2 together with the screw 12.

[0071] Understandably, the process of the electronic expansion valve 100 gradually opening is as follows: the screw 12 drives the bearing assembly 13 to move away from the second valve port 32, the elastic element 14 gradually resets, absorbing the gap between the bearing assembly 13 and the retaining ring 115 until the bearing assembly 13 and the retaining ring 115 abut against each other, and then the screw 12 continues to move away from the second valve port 32, driving the first valve needle 11 to move away from the second valve port 32, slowly opening the second valve port 32. At this time, the medium can enter the first cavity 21 through the first connecting hole 23, and flow into the third cavity 31 through the second connecting hole 33, and then flow out of the first valve port 24 through the second valve port 32. Alternatively, the medium can pass through the first valve port 24 and the second valve port 32 in sequence into the third cavity 31, enter the first cavity 21 through the second connecting hole 33, and finally flow out through the first connecting hole 23.

[0072] The screw 12 continues to drive the first valve needle 11 to move away from the first valve port 24 until the surfaces of the second limiting structure 117 and the first limiting structure 341 facing the first valve port 24 stop. The screw 12 drives the first valve needle 11 and the second valve needle 3 to move together away from the first valve port 24 to open the first valve port 24. At this time, the first valve needle 11 and the second valve needle 3 will not move relative to each other in the axial direction of the housing 2, so that the first valve port 24 is fully opened. The medium can flow into the first cavity 21 through one of the first connecting hole 23 and the first valve port 24, and flow out through the other.

[0073] The process of the electronic expansion valve 100 gradually closing: When the second valve needle 3 opens the first valve port 24, the first connecting hole 23 and the first valve port 24 are connected through the first cavity 21. The medium can flow into the first cavity 21 from one of the first connecting hole 23 and the first valve port 24 and flow out from the other. At this time, the surfaces of the second limiting structure 117 and the first limiting structure 341 facing the first valve port 24 stop; the screw 12 moves towards the direction close to the first valve port 24, and the screw 12 drives the first valve needle 11 and the second valve needle 3 to move towards the direction close to the first valve port 24. The second elastic element 5 gradually resets. At this time, the first valve needle 11 and the second valve needle 3 will not move relative to each other in the axial direction of the housing 2. When the second valve needle 3 blocks the first valve port 24, the second valve needle 3 can no longer move toward the first valve port 24. The screw 12 continues to push the first valve needle 11 toward the direction closer to the second valve port 32. The second limiting structure 117 gradually separates from the first limiting structure 341. At this time, the medium can enter the first cavity 21 through the first connecting hole 23, and flow into the third cavity 31 through the second connecting hole 33, and then flow out of the first valve port 24 through the second valve port 32. Alternatively, the medium can pass through the first valve port 24 and the second valve port 32 in sequence. The valve port 32 enters the third cavity 31, enters the first cavity 21 through the second connecting hole 33, and finally flows out through the first connecting hole 23. When the first valve needle 11 blocks the second valve port 32, the second valve needle 3 can no longer move toward the second valve port 32. The screw 12 is over-tightened and compresses the elastic element 14, so that the bearing assembly 13 and the retaining ring 115 are separated, generating a pre-tightening force and reserving a set valve opening pulse, so that the electronic expansion valve 100 can have sufficient sealing force to block the second valve port 32 when the power is off or when it is not running, thus avoiding media leakage.

[0074] Example 2 like Figure 5As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components marked in the same way. The only difference is that the first component 111 is formed as a guide sleeve 113, which defines the mounting cavity. One end of the screw 12 extends into the guide sleeve 113 along its length. The end of the mounting cavity opposite to the screw 12 has an open opening. The second component 112 includes a needle body 114 and a retaining ring 116. The retaining ring 116 is sleeved on the needle body 114 and is used to fix the needle body 114 at the open opening. The bearing assembly 13 is movably disposed in the receiving cavity 110 along the axial direction of the first valve needle 11.

[0075] Example 3 like Figure 6 As shown, the structure of this embodiment is roughly the same as that of embodiment two, with the same components marked in the same way. The only difference is that the protrusion 132 is connected to the end of the bearing body 131 near the first valve port 24 along the axial direction of the first valve needle 11.

[0076] Example 4 like Figure 7 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components marked in the same way. The only difference is that the electronic expansion valve 100 does not include the second valve needle 3. The valve needle structure 1 is located inside the housing 2, and part of the first valve needle 11 extends into the first cavity 21 to open or close the first valve port 24. The axial end face of the first valve needle 11 has a mating hole that communicates with the receiving cavity 110. The screw extends into the receiving cavity 110 from the mating hole. The bearing body 131 passes through the mating hole. The protrusion 132 is connected to one end of the bearing body 131 located in the receiving cavity 110. The protrusion 132 is adapted to abut against the inner wall of the receiving cavity 110 near the screw 12.

[0077] Understandably, during the gradual closing process of the electronic expansion valve 100: the screw 12 moves toward the direction of approaching the first valve port 24. Since the elastic element 14 is relatively hard, it will not be compressed at this time, so the first valve needle 11 and the elastic element 14 move together as a whole toward the direction of approaching the first valve port 24 until the second valve needle 3 blocks the first valve port 24. The second valve needle 3 can no longer move, but under the drive of the drive assembly 4, the screw 12 continues to rotate and move toward the direction of approaching the first valve port 24, compressing the elastic element 14, generating a pre-tightening force, and reserving a set valve opening pulse, so that the electronic expansion valve 100 can have sufficient sealing force to block the first valve port 24 when the power is off or when it is not running, thus preventing media leakage.

[0078] The process of the electronic expansion valve 100 gradually opening: the screw 12 moves in a direction away from the first valve port 24, the elastic element 14 gradually resets, and then the screw 12 continues to move in a direction away from the first valve port 24, driving the first valve needle 11 to move in a direction away from the first valve port 24, and the first valve port 24 opens. At this time, the medium can flow into the first cavity 21 through one of the first connecting hole 23 and the first valve port 24, and flow out through the other, thereby ensuring the reliability and stability of the second valve needle 3 sealing the first valve port 24, reducing the failure risk of the electronic expansion valve 100, and extending the service life of the electronic expansion valve 100.

[0079] Other configurations and operations of the valve needle structure 1 and the electronic expansion valve 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A valve needle structure, characterized in that, include: A first valve needle (11) having a receiving cavity (110); A screw (12) extends along the axial direction of the first valve needle (11), and one end of the screw (12) in the length direction extends into the receiving cavity (110); The bearing assembly (13) includes a bearing body (131) and a protrusion (132). The bearing body (131) is sleeved on the screw (12). The protrusion (132) is sleeved outside the bearing body (131) and extends along the circumferential direction of the bearing body (131). The protrusion (132) is located inside the receiving cavity (110). An elastic element (14) is disposed in the receiving cavity (110). One end of the elastic element (14) in the length direction abuts against the inner wall of the receiving cavity (110) away from the screw (12), and the other end abuts against the protrusion (132). It is used to drive the bearing assembly (13) to move in the direction away from the inner wall of the receiving cavity (110) away from the screw (12).

2. The valve needle structure according to claim 1, characterized in that, The protrusion (132) extends in a ring shape along the circumferential direction of the bearing body (131); Alternatively, the protrusion (132) extends in an open ring shape along the circumferential direction of the bearing body (131); Alternatively, the protrusion (132) may include a plurality of sub-protrusions, which are spaced apart along the circumferential direction of the bearing body (131), and the elastic member (14) may be adapted to abut against at least one of the plurality of sub-protrusions.

3. The valve needle structure according to claim 1, characterized in that, The protrusion (132) and the outer ring of the bearing body (131) are integrally formed parts; Alternatively, the protrusion (132) and the outer ring of the bearing body (131) may be machined separately.

4. The valve needle structure according to claim 1, characterized in that, Along the axial direction of the first valve needle (11), the protrusion (132) is connected to one axial end of the bearing body (131).

5. The valve needle structure according to claim 1, characterized in that, The bearing body (131) is located within the receiving cavity (110), and the first valve needle (11) includes: A first component (111) and a second component (112), the first component (111) defining a mounting cavity having an open end along the axial direction of the first valve needle (11), and the second component (112) covering the open end to define the receiving cavity (110) together with the first component (111).

6. The valve needle structure according to claim 5, characterized in that, The first component (111) includes a guide sleeve (113) and a needle body (114). The guide sleeve (113) defines the mounting cavity. The screw (12) extends into the mounting cavity through the opening. The needle body (114) is connected to the end of the guide sleeve (113) opposite to the screw (12). The second component (112) is formed as a retaining ring (115). The retaining ring (115) surrounds the screw (12) and is fixed at the opening. The bearing assembly (13) is movably disposed in the receiving cavity (110) along the axial direction of the first valve needle (11). Alternatively, the first component (111) is formed as a guide sleeve (113), which defines the mounting cavity. One end of the screw (12) extends into the guide sleeve (113) along its length. The end of the mounting cavity opposite to the screw (12) has the opening. The second component (112) includes a needle body (114) and a retaining ring (116). The retaining ring (116) is sleeved on the needle body (114) to fix the needle body (114) at the opening. The bearing assembly (13) is movably disposed in the receiving cavity (110) along the axial direction of the first valve needle (11).

7. The valve needle structure according to claim 1, characterized in that, The first valve needle (11) has a mating hole on its axial end face, which communicates with the receiving cavity (110). The screw (12) extends into the receiving cavity (110) through the mating hole. The bearing body (131) passes through the mating hole. The protrusion (132) is connected to one end of the bearing body (131) located in the receiving cavity (110). The protrusion (132) is adapted to abut against the inner wall of the receiving cavity (110) near the screw (12).

8. An electronic expansion valve, characterized in that, Includes the valve needle structure (1) according to any one of claims 1-7.

9. The electronic expansion valve according to claim 8, characterized in that, Also includes: The housing (2) has a first cavity (21), a second cavity (22), a first connecting hole (23) and a first valve port (24). The first cavity (21) and the second cavity (22) are arranged in the axial direction of the housing (2). The first connecting hole (23) is provided on the peripheral wall of the first cavity (21) and communicates with the first cavity (21). The first valve port (24) is provided at the end of the first cavity (21) away from the second cavity (22). The second valve needle (3) is disposed inside the housing (2) and partially extends into the first cavity (21). The second valve needle (3) is movable along the axial direction of the housing (2) to open or close the first valve port (24). The second valve needle (3) has a third cavity (31). The second valve needle (3) has a second valve port (32) communicating with the third cavity (31) on the axial end face away from the second cavity (22). The peripheral wall of the second valve needle (3) has a second communicating hole (33) communicating with the third cavity (31) and the first cavity (21). The valve needle structure (1) is inserted inside the second valve needle (3) and is movable along the axial direction of the housing (2). Part of the first valve needle (11) is disposed inside the third cavity (31) to open or close the second valve port (32). The axial direction of the first valve needle (11) is the same as the axial direction of the housing (2). A drive assembly (4) is disposed on the housing (2) and is used to drive the screw (12) to move along the axial direction of the housing (2).

10. The electronic expansion valve according to claim 8, characterized in that, Also includes: The housing (2) has a first cavity (21), a second cavity (22), a first connecting hole (23), and a first valve port (24). The first cavity (21) and the second cavity (22) are arranged in the axial direction of the housing (2). The first connecting hole (23) is provided on the peripheral wall of the first cavity (21) and communicates with the first cavity (21). The first valve port (24) is provided at one end of the first cavity (21) away from the second cavity (22). The valve needle structure (1) is provided in the housing (2), and part of the first valve needle (11) extends into the first cavity (21) for opening or closing the first valve port (24). The axial direction of the first valve needle (11) is the same as the axial direction of the housing (2). A drive assembly (4) is disposed on the housing (2) and is used to drive the screw (12) to move along the axial direction of the housing (2).

Images