Electronic expansion valve and refrigeration apparatus

Abstract

The application relates to an electronic expansion valve and a refrigeration device, the electronic expansion valve comprising a shell and a nut assembly installed on the shell, the nut assembly comprising a body part, a matching part and a mounting part, the matching part being press-fitted with the shell, the mounting part being injection-molded with the matching part, the matching part comprising a base part and a peripheral part, the base part being circumferentially and outwardly extended from the body part, the peripheral part being downwardly extended from the base part along the axial direction of the nut assembly, and the peripheral part and the body part being provided with a hollow part; the nut assembly further comprising a reinforcing part, at least part of the reinforcing part being located in the hollow part, one side of the reinforcing part being connected with the body part, and the other side being connected with the peripheral part. The hollow part can reduce the possibility of shrinkage deformation of the body part of the nut assembly under the action of pressure during installation and disassembly, and at least part of the reinforcing part located in the hollow part can increase the strength of the peripheral part, thereby prolonging the service life of the nut assembly.

Description

Technical Field

[0001] This application relates to the field of expansion valve technology, and more particularly to an electronic expansion valve and refrigeration equipment. Background Technology

[0002] An electronic expansion valve consists of a housing, a drive assembly, a nut assembly, and a valve needle. The drive assembly converts its own rotation into the movement of the valve needle through the nut assembly, thereby controlling the refrigerant flow through the inlet or outlet of the expansion valve and thus controlling the refrigeration efficiency of the refrigeration equipment. Typically, the nut assembly includes a mating part on the body. The nut assembly is installed inside the housing through a press-fitting fit between the mating part and the housing. During installation and disassembly, the body of the nut assembly may shrink and deform under the pressure generated by the press-fitting fit. Summary of the Invention

[0003] This application provides an electronic expansion valve and a refrigeration device that can relatively reduce the possibility of shrinkage deformation in the body of the nut component.

[0004] The first aspect of this application provides an electronic expansion valve, including a housing and a nut assembly mounted on the housing. The nut assembly includes a body portion, a mating portion, and a mounting portion. The mating portion is press-fitted to the housing. The mounting portion and the mating portion are formed by injection molding inserts. The mating portion includes a base portion and a peripheral portion. The base portion extends outward from the circumference of the body portion, and the peripheral portion extends downward from the base portion along the axial direction of the nut assembly. There is a preset distance between the peripheral portion and the body portion, and the preset distance forms a hollow portion. The nut assembly also includes a reinforcing portion. At least a portion of the reinforcing portion is located in the hollow portion. One side of the reinforcing portion is connected to the body portion, and the other side of the reinforcing portion is connected to the peripheral portion.

[0005] In this application, during installation and disassembly, the hollow portion can reduce the possibility of shrinkage deformation of the main body of the nut assembly under pressure; at least part of the reinforcing portion is located in the hollow portion, which can increase the strength of the peripheral portion, reduce the risk of damage to the peripheral portion during press-fitting, and thus extend the service life of the nut assembly.

[0006] In some embodiments, the mounting portion is provided with a first balancing hole, and the reinforcing portion includes a second balancing hole disposed opposite to the first balancing hole.

[0007] In some embodiments, along the radial direction of the nut assembly, the end of the reinforcing portion away from the body portion has a first extension portion and a second extension portion disposed opposite to each other along the circumferential direction of the nut assembly, a recess portion is formed between the first extension portion and the second extension portion, the recess portion extends radially along the nut assembly and penetrates the reinforcing portion, and the recess portion forms a second balancing hole; along the circumferential direction of the nut assembly, both ends of the mating portion are respectively connected to the first extension portion and the second extension portion.

[0008] In some embodiments, there are multiple mating parts, and adjacent mating parts are connected by reinforcing parts.

[0009] In some embodiments, the housing is provided with a second receiving cavity, a nut assembly is installed in the second receiving cavity, the housing is provided with an inlet and an outlet, the second receiving cavity is connected to an inlet pipe through the inlet, and the second receiving cavity is connected to an outlet pipe through the outlet; the electronic expansion valve also includes a valve needle and a drive assembly, one end of the valve needle is installed in the nut assembly, and the other end of the valve needle extends into the inlet or outlet, and the valve needle can move relative to the nut assembly along the axial direction of the nut assembly to control the length of the valve needle extending into the inlet or outlet; the drive assembly is installed in the second receiving cavity, and the drive assembly can rotate about its own axis and drive the valve needle to move.

[0010] In some embodiments, the mating portion of the nut assembly abuts against the sidewall of the second receiving cavity, and the mating portion is interference-fitted with the sidewall of the second receiving cavity.

[0011] In some embodiments, the sidewall of the second receiving cavity is provided with a first mating groove and a second mating groove extending axially along the nut assembly. The diameter of the first mating groove is larger than the diameter of the second mating groove. When the nut assembly is installed on the housing, the mating part is clearance-fitted or interference-fitted with the first mating groove, and the mating part is interference-fitted with the second mating groove.

[0012] In some embodiments, the mating part includes a first mating section that mates with a first mating groove and a second mating section that mates with a second mating groove. Along the axial direction of the nut assembly, the length of the first mating section is L1 and the length of the second mating section is L2. L1 and L2 must satisfy: L1≤L2.

[0013] In some embodiments, the body portion includes a guide portion and a connecting portion. Along the axial direction of the nut assembly, the connecting portion is connected to one end of the guide portion. The guide portion is provided with a first cavity, and the connecting portion is provided with a second cavity communicating with the first cavity. The first cavity and the second cavity form a first receiving cavity that penetrates the nut assembly along the axial direction of the nut assembly. The valve needle is mounted on the guide portion and is movable along the side wall of the first cavity. The drive assembly includes a rotor and a drive rod mounted on the connecting portion. One end of the drive rod is connected to the rotor, and the other end of the drive rod extends into the first cavity through the second cavity and is connected to the valve needle. The rotor is rotatable about its own axis, and the rotor is able to drive the valve needle to move through the drive rod.

[0014] A second aspect of this application provides a refrigeration device, comprising: a device body; and an electronic expansion valve as described in any of the preceding claims, wherein the electronic expansion valve is installed on the device body.

[0015] In some embodiments, the electronic expansion valve can control the flow rate of the refrigerant flowing through it to adjust the cooling efficiency of the refrigeration equipment.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0017] Figure 1 A cross-sectional view of the electronic expansion valve provided in this application in a specific embodiment;

[0018] Figure 2 for Figure 1 Cross-sectional view of the nut assembly;

[0019] Figure 3 for Figure 1 A sectional view of the central base;

[0020] Figure 4 for Figure 2 A schematic diagram of the structure of the middle nut assembly in one specific embodiment, wherein the number of second balance holes is two;

[0021] Figure 5 for Figure 4 A bottom view;

[0022] Figure 6 for Figure 2 A schematic diagram of the structure of the middle nut assembly in another specific embodiment, wherein the number of second balance holes is three;

[0023] Figure 7 for Figure 6 A bottom view.

[0024] Figure label:

[0025] 1-Nut assembly;

[0026] 11-Body part;

[0027] 111-Guide section;

[0028] 111a - First cavity;

[0029] 112 - Connecting part;

[0030] 112a - Second cavity;

[0031] 112b - Internal thread;

[0032] 113 - First receiving cavity;

[0033] 12-Matching section;

[0034] 121-base;

[0035] 122 - Peripheral part;

[0036] 122a - First mating section;

[0037] 122b - Second mating section;

[0038] 123 - Openwork section;

[0039] 13-Reinforced Department;

[0040] 131 - First extension;

[0041] 132 - Second extension;

[0042] 133 - Second balancing hole;

[0043] 14-Installation Department;

[0044] 141 - First balancing hole;

[0045] 2-Shell;

[0046] 21-Second receiving cavity;

[0047] 211-Third cavity;

[0048] 212 - Fourth cavity;

[0049] 22-Inlet;

[0050] 23-liquid outlet;

[0051] 24 - Base;

[0052] 241 - First mating groove;

[0053] 242 - Second mating groove;

[0054] 25 - Top cover;

[0055] 3-Inlet pipe;

[0056] 4-Discharge pipeline;

[0057] 5-Valve needle;

[0058] 6-Driver components;

[0059] 61-Rotor;

[0060] 62-Drive lever.

[0061] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0062] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0063] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0064] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0065] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0066] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0067] This application provides a refrigeration device, which includes a device body and an electronic expansion valve installed on the device body. The electronic expansion valve can control the flow rate of the refrigerant flowing through it to adjust the cooling efficiency of the refrigeration device.

[0068] like Figure 1 As shown, the electronic expansion valve includes: a housing 2, a nut assembly 1 installed in a second receiving cavity 21 of the housing 2, a valve needle 5 installed in the nut assembly 1, and a drive assembly 6 installed in the nut assembly 1. The housing 2 is provided with an inlet 22 and an outlet 23. The second receiving cavity 21 is connected to an inlet pipe 3 through the inlet 22 and to an outlet pipe 4 through the outlet 23. One end of the valve needle 5 is installed in the nut assembly 1, and the other end of the valve needle 5 extends into the inlet 22 or the outlet 23. The drive assembly 6 can rotate around its own axis to drive the valve needle 5 to move axially relative to the nut assembly 1, thereby controlling the length of the valve needle 5 extending into the inlet 22 or the outlet 23, thereby adjusting the opening size of the inlet 22 or the outlet 23, and ultimately regulating the flow rate of the refrigerant flowing through the electronic expansion valve.

[0069] In this embodiment, the opening size of the inlet 22 or outlet 23 is adjusted by driving the movement of the valve needle 5, which simplifies the structure of the electronic expansion valve, thereby reducing the production cost of the electronic expansion valve and reducing the space required for its installation. Driving the valve needle 5 with a driving component improves the smoothness of its movement and simplifies the operator's manual control of the valve needle 5, thus reducing the difficulty of operation.

[0070] The housing 2 includes a separate base 24 and a top cover 25 to facilitate the installation, maintenance and replacement of internal parts.

[0071] Specifically, such as Figure 1 and Figure 2 As shown, the nut assembly 1 includes a body portion 11, which includes a guide portion 111 and a connecting portion 112. Along the axial direction of the nut assembly 1, the connecting portion 112 is connected to one end of the guide portion 111. The guide portion 111 is provided with a first cavity 111a, and the connecting portion 112 is provided with a second cavity 112a communicating with the first cavity 111a. The first cavity 111a and the second cavity 112a form a first receiving cavity 113 that penetrates the nut assembly 1 along the axial direction of the nut assembly 1. The valve needle 5 is installed on the guide portion 111, and the valve needle 5 can move along the side wall of the first cavity 111a. The drive assembly 6 includes a rotor 61 and a drive rod 62 installed on the connecting portion 112. One end of the drive rod 62 is connected to the rotor 61, and the other end of the drive rod 62 extends into the first cavity 111a through the second cavity 112a and is connected to the valve needle 5. The rotor 61 can rotate around its own axis, and the rotor 61 can drive the valve needle 5 to move through the drive rod 62.

[0072] In this embodiment, when the rotor 61 rotates around its own axis, it can drive the drive rod 62 to move. The valve needle 5 can move axially along the nut assembly 1 under the action of the drive rod 62 to adjust the opening size of the inlet 22 or the outlet 23. Therefore, the rotor 61 and the valve needle 5 are connected by the drive rod 62, which simplifies the connection between the rotor 61 and the valve needle 5, thereby simplifying the structure of the rotor 61 and the valve needle 5, reducing the space occupied by the rotor 61 and the valve needle 5 in the second cavity 112a when they are installed, and thus reducing the size of the entire electronic expansion valve. The valve needle 5 moves along the side wall of the first cavity 111a, reducing the risk of the valve needle 5 deviating from the preset trajectory during movement, thereby improving the stability of the valve needle 5's movement and thus improving the working stability of the valve needle 5.

[0073] More specifically, such as Figure 1 and Figure 2As shown, the side wall of the second cavity 112a is provided with an internal thread 112b to form a threaded hole, and the drive rod 62 is provided with an external thread that matches the internal thread 112b, so that the drive rod 62 is threadedly connected to the connecting part 112. When the rotor 61 rotates around its own axis, the drive rod 62 rotates under the drive of the rotor 61, and the drive rod 62 moves up and down along the axial direction of the nut assembly 1 under the action of the external thread and the internal thread 112b, thereby driving the valve needle 5 to move up and down along the axial direction of the nut assembly 1.

[0074] In this embodiment, the drive rod 62 and the connecting part 112 are connected by a thread, which makes it easy for the drive rod 62 to convert the rotation of the rotor 61 into the movement of the valve needle 5, thereby simplifying the structure of the drive rod 62 and reducing the production cost of the drive rod 62.

[0075] The drive rod 62 is coaxially arranged with the rotor 61 to reduce the space required for the rotor 61 and drive rod 62 to rotate, thereby reducing the space occupied by the second cavity 112a when the rotor 61 and valve needle 5 are installed, and thus reducing the size of the entire electronic expansion valve.

[0076] Specifically, such as Figure 1 and Figure 2 As shown, the nut assembly 1 also includes a mating part 12, which includes a base 121 and a peripheral part 122. The base 121 extends outward from the body part 11 in a circumferential direction, and the peripheral part 122 extends downward from the base 121 along the axial direction of the nut assembly 1. The mating part 12 abuts against the side wall of the second receiving cavity 21, and the mating part 12 and the side wall of the second receiving cavity 21 are in an interference fit.

[0077] In this embodiment, the mating part 12 is press-fitted with the side wall of the second receiving cavity 21, that is, the nut assembly 1 and the housing 2 are press-fitted together. While ensuring the connection stability between the nut assembly 1 and the housing 2, the structural form of the nut assembly 1 and the housing 2 is simplified, thereby reducing the production cost of the nut assembly 1 and the housing 2.

[0078] More specifically, such as Figure 3 As shown, the sidewall of the second receiving cavity 21 is provided with a first mating groove 241 and a second mating groove 242 extending along the axial direction of the nut assembly 1. The diameter of the groove of the first mating groove 241 is larger than the diameter of the groove of the second mating groove 242. When the nut assembly 1 is installed on the housing 2, the mating part 12 is clearance-fitted or interference-fitted with the first mating groove 241, and the mating part 12 is interference-fitted with the second mating groove 242.

[0079] In this embodiment, the mating part 12 is interference-fitted with the first mating groove 241 and the mating part 12 is interference-fitted with the second mating groove 242, which can improve the stability of the press-fit between the nut assembly 1 and the housing 2; a part of the mating part 12 is clearance-fitted with the first mating groove 241, and the other part of the mating part 12 is interference-fitted with the second mating groove 242. While ensuring the stability of the press-fit between the nut assembly 1 and the housing 2, it can facilitate the installation of the nut assembly 1 and the housing 2 and reduce the installation difficulty of the electronic expansion valve.

[0080] Among them, such as Figure 2 As shown, the mating part 12 includes a first mating section 122a that mates with the first mating groove 241 and a second mating section 122b that mates with the second mating groove 242. Along the axial direction of the nut assembly 1, the length of the first mating section 122a is L1 and the length of the second mating section 122b is L2. L1 and L2 must satisfy: L1≤L2.

[0081] In this embodiment, when a part of the mating part 12 is clearance-fitted with the first mating groove 241 and another part of the mating part 12 is interference-fitted with the second mating groove 242, L1≤L2, the mating dimension between the mating part 12 and the second mating groove 242 can be increased, thereby increasing the press-fit dimension between the nut assembly 1 and the housing 2, and further increasing the stability of the press-fit between the nut assembly 1 and the housing 2.

[0082] In addition, such as Figure 1 and Figure 2 As shown, the nut assembly 1 is also provided with a mounting part 14. When the nut assembly 1 is press-fitted with the housing 2, the mounting part 14 can abut against the housing 2. At this time, the mounting part 14 and the housing 2 are fixed by fasteners (including but not limited to screws and bolts), thereby further increasing the stability of the connection between the nut assembly 1 and the housing 2.

[0083] The specific structure of nut assembly 1 is as follows: Figure 2 , Figures 4-7 As shown, the nut assembly 1 includes: a body portion 11, a mating portion 12, and a mounting portion 14. The mounting portion 14 and the base portion 121 are formed by injection molding inserts. The mounting portion 14 is provided with a first balancing hole 141. The peripheral portion 122 and the body portion 11 have a preset distance, which forms a hollow portion 123. The nut assembly 1 also includes a reinforcing portion 13. At least a portion of the reinforcing portion 13 is located in the hollow portion 123. One side of the reinforcing portion 13 is connected to the body portion 11, and the other side of the reinforcing portion 13 is connected to the peripheral portion 122. The reinforcing portion 13 is provided with a second balancing hole 133 corresponding to the first balancing hole 141.

[0084] In this application, during installation and disassembly, the hollow portion 123 reduces the possibility of the body portion 11 of the nut assembly 1 shrinking and deforming under pressure, thereby reducing the risk of the guide portion 111 deforming under pressure and causing the valve needle 5 to be obstructed, and thus improving the stability of the valve needle 5 movement. At least a portion of the reinforcing portion 13 is located in the hollow portion 123, which increases the strength of the peripheral portion 122, reduces the risk of damage to the peripheral portion 122 during press-fitting, and thus extends the service life of the nut assembly 1.

[0085] Among them, such as Figure 1 As shown, after the nut assembly 1 is installed on the housing 2, the mounting part 14 divides the second receiving cavity 21 into a third cavity 211 and a fourth cavity 212 distributed along the axial direction of the nut assembly 1. During the operation of the electronic expansion valve, the pressure inside the cavity changes due to the flow of refrigerant in the third cavity 211 and / or the fourth cavity 212. Therefore, a first balance hole 141 that can connect the third cavity 211 and the fourth cavity 212 is provided on the mounting part 14 to balance the pressure of the third cavity 211 and the fourth cavity 212, thereby reducing the risk of poor flow of refrigerant under the pressure difference between the third cavity 211 and the fourth cavity 212, thus improving the flow stability of refrigerant in the electronic expansion valve, and further improving the working stability of the electronic expansion valve.

[0086] Furthermore, the reinforcing portion 13 and / or the peripheral portion 122 are provided with a second balancing hole 133 corresponding to the first balancing hole 141, and the second balancing hole 133 communicates with the first balancing hole 141. This reduces the risk of the reinforcing portion 13 and the peripheral portion 122 obstructing the first balancing hole 141, thereby improving the working stability of the first balancing hole 141, and further improving the working stability of the electronic expansion valve. In this embodiment, the second balancing hole 133 is provided in the reinforcing portion 13, reducing the risk that providing the second balancing hole 133 in the peripheral portion 122 would weaken the strength of the peripheral portion 122, thereby improving the strength of the peripheral portion 122 and extending its service life.

[0087] Specifically, such as Figure 2 , Figures 4-7 As shown, along the radial direction of the nut assembly 1, the end of the reinforcing part 13 away from the body part 11 has a first extension 131 and a second extension 132 arranged circumferentially opposite to each other along the nut assembly 1. A recess is formed between the first extension 131 and the second extension 132. The recess extends radially along the nut assembly 1 and penetrates the reinforcing part 13. The recess forms a second balancing hole 133.

[0088] In this embodiment, a first extension 131 and a second extension 132 are provided, and a second balance hole 133 is formed through the recess between the first extension 131 and the second extension 132. This reduces the risk that the strength of the reinforcing part 13 will be weakened due to the processing of the second balance hole 133 in the middle of the reinforcing part 13, thereby improving the strength of the reinforcing part 13 and extending the service strength of the reinforcing part 13.

[0089] More specifically, such as Figure 2 , Figures 4-7 As shown, along the circumference of the nut assembly 1, the two ends of the mating part 12 are respectively connected to the first extension part 131 and the second extension part 132, so that the second balance hole 133 passes through the mating part 12 and the reinforcing part 13 along the axial direction of the nut assembly 1, so as to facilitate the machining of the second balance hole 133.

[0090] More specifically, there are multiple mating parts 12, and adjacent mating parts 12 are connected by reinforcing parts 13, thereby increasing the reinforcing effect of the reinforcing parts 13 on the mating parts 12. The multiple reinforcing parts 13 are evenly distributed circumferentially along the guide part 111, reducing the risk of deformation of some mating parts 12 under pressure due to uneven distribution of the reinforcing parts 13, thus further increasing the reinforcing effect of the reinforcing parts 13 on the mating parts 12. Furthermore, the number of reinforcing parts 13 includes, but is not limited to, two or three.

[0091] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electronic expansion valve, characterized in that, The assembly includes a housing (2) and a nut assembly (1) mounted on the housing (2). The nut assembly (1) includes a body (11), a mating part (12), and a mounting part (14). The mating part (12) is press-fitted to the housing (2). The mounting part (14) and the mating part (12) are formed by injection molding. The mating part (12) includes a base (121) and a peripheral part (122). The base (121) extends outward from the body (11) in the circumferential direction. The peripheral part (122) extends downward from the base (121) along the axial direction of the nut assembly. There is a preset distance between the peripheral part and the body. The preset distance forms a hollow part (123). The mounting part (14) is provided with a first balancing hole (141). The nut assembly (1) further includes a reinforcing part (13), at least a portion of which is located in the hollow part (123). One side of the reinforcing part (13) is connected to the body part (11), and the other side of the reinforcing part (13) is connected to the peripheral part (122). The reinforcing part (13) also includes a second balancing hole (133) corresponding to the first balancing hole (141). Along the radial direction of the nut assembly (1), the reinforcing part (13) has a first extension (131) and a second extension (132) disposed opposite to each other in the circumferential direction of the nut assembly (1) at one end away from the body part (11).

2. The electronic expansion valve according to claim 1, characterized in that, A recess is formed between the first extension (131) and the second extension (132), the recess extending radially along the nut assembly (1) and penetrating the reinforcing portion (13), the recess forming the second balancing hole (133). Along the circumference of the nut assembly (1), the two ends of the mating part (12) are connected to the first extension (131) and the second extension (132), respectively.

3. The electronic expansion valve according to claim 1, characterized in that, The number of mating parts (12) is multiple, and adjacent mating parts (12) are connected by the reinforcing part (13).

4. The electronic expansion valve according to claim 1, characterized in that, The housing (2) is provided with a second receiving cavity (21), the nut assembly (1) is installed in the second receiving cavity (21), the housing (2) is provided with a liquid inlet (22) and a liquid outlet (23), the second receiving cavity (21) is connected to the liquid inlet pipe (3) through the liquid inlet (22), and the second receiving cavity (21) is connected to the liquid outlet pipe (4) through the liquid outlet (23); The electronic expansion valve also includes a valve needle (5) and a drive assembly (6). One end of the valve needle (5) is mounted on the nut assembly (1), and the other end of the valve needle (5) extends into the inlet (22) or the outlet (23). Along the axial direction of the nut assembly (1), the valve needle (5) can move relative to the nut assembly (1) to control the length of the valve needle (5) extending into the inlet (22) or the outlet (23). The drive assembly (6) is installed in the second receiving cavity (21). The drive assembly (6) is able to rotate around its own axis and drive the valve needle (5) to move.

5. The electronic expansion valve according to claim 4, characterized in that, The mating part (12) of the nut assembly (1) abuts against the side wall of the second receiving cavity (21), and the mating part (12) is interference-fitted with the side wall of the second receiving cavity (21).

6. The electronic expansion valve according to claim 5, characterized in that, The sidewall of the second receiving cavity (21) is provided with a first mating groove (241) and a second mating groove (242) extending along the axial direction of the nut assembly (1), wherein the groove diameter of the first mating groove (241) is larger than the groove diameter of the second mating groove (242); When the nut assembly (1) is installed on the housing (2), the mating part (12) is in clearance fit or interference fit with the first mating groove (241), and the mating part (12) is in interference fit with the second mating groove (242).

7. The electronic expansion valve according to claim 6, characterized in that, The mating part (12) includes a first mating section (122a) that mates with the first mating groove (241) and a second mating section (122b) that mates with the second mating groove (242). Along the axial direction of the nut assembly (1), the length of the first mating section (122a) is L1 and the length of the second mating section (122b) is L2. L1 and L2 must satisfy: L1≤L2.

8. The electronic expansion valve according to claim 4, characterized in that, The main body (11) includes a guide (111) and a connecting part (112). Along the axial direction of the nut assembly (1), the connecting part (112) is connected to one end of the guide (111). The guide (111) is provided with a first cavity (111a), and the connecting part (112) is provided with a second cavity (112a) communicating with the first cavity (111a). The first cavity (111a) and the second cavity (112a) form a first receiving cavity (113) that penetrates the nut assembly (1) along the axial direction of the nut assembly (1). The valve needle (5) is mounted on the guide portion (111), and the valve needle (5) is movable along the side wall of the first cavity (111a). The drive assembly (6) includes a rotor (61) and a drive rod (62) mounted on the connecting part (112). One end of the drive rod (62) is connected to the rotor (61), and the other end of the drive rod (62) extends into the first cavity (111a) through the second cavity (112a) and is connected to the valve needle (5). The rotor (61) can rotate around its own axis, and the rotor (61) can drive the valve needle (5) to move through the drive rod (62).

9. A refrigeration device, characterized in that, The refrigeration equipment includes: Equipment body; The electronic expansion valve according to any one of claims 1 to 8, wherein the electronic expansion valve is installed on the device body.

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