Electronic expansion valve and refrigeration equipment

Abstract

The present invention discloses an electronic expansion valve and a refrigeration device. The electronic expansion valve includes a housing, a coil assembly, a rotor assembly, a sleeve, a valve body, and a snap ring. The housing has a receiving cavity and an installation opening communicating with the receiving cavity. The coil assembly is disposed in the receiving cavity. The rotor assembly is disposed in the coil assembly and extends out from the installation opening. The sleeve sleeves the rotor assembly and is located between the coil assembly and the rotor assembly. One end of the sleeve extends out from the installation opening. The valve body is connected to one end of the sleeve extending out from the installation opening. The snap ring includes a spring seat and a snap ring provided on the spring seat. The spring seat is disposed in the housing and is connected to the coil assembly. The snap ring extends out from the installation opening and sleeves the outer periphery of the sleeve. The snap ring elastically abuts against the sleeve or the valve body. The electronic expansion valve of the present invention can effectively improve the positioning stability of the coil assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control components, and particularly to an electronic expansion valve and a refrigeration device. Background Art

[0002] An electronic expansion valve is a regulating element for the refrigerant flow rate in a common heat pump type variable frequency air conditioning system. It can improve its control characteristics of the refrigerant flow rate in the evaporator, make it match well with other components of the system, and adapt to the working conditions and load change requirements of the equipment. It realizes the flow regulation function by controlling the electromagnetic coil to drive the rotor component to rotate, thereby driving the valve needle to move up and down. The position of the coil has a great influence on the flow rate regulated by the valve needle. It is necessary to keep the position of the coil fixed and relatively stable and not loose with respect to the valve body.

[0003] In the related art, the fixing methods for the coil mostly adopt snap joints, welding, etc., which are time-consuming and laborious, and the coil cannot be effectively fixed during high-frequency vibration, easily causing the coil to loosen, thereby affecting the performance of the electronic expansion valve.

[0004] The above content is only used to assist in understanding the technical solution of the invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main object of the present invention is to propose an electronic expansion valve and a refrigeration device, aiming to solve the technical problem of the positioning stability of the coil of the electronic expansion valve.

[0006] To achieve the above object, the electronic expansion valve and refrigeration device proposed by the present invention include:

[0007] A housing having a receiving cavity and an installation opening communicating with the receiving cavity;

[0008] A coil assembly disposed in the receiving cavity;

[0009] A rotor assembly disposed in the coil assembly and extending out through the installation opening;

[0010] A sleeve sleeving the rotor assembly and located between the coil assembly and the rotor assembly, one end of the sleeve extending out through the installation opening;

[0011] A valve body connecting one end of the sleeve extending out of the installation opening; and

[0012] A snap ring including a spring seat and a retaining ring provided on the spring seat. The spring seat is disposed in the housing and connected to the coil assembly. The retaining ring extends out through the installation opening and sleeves the outer periphery of the sleeve, and the retaining ring is elastically abutted against the sleeve or the valve body.

[0013] In one embodiment, the snap ring has a sleeving portion and an avoidance portion. The sleeving portion is sleeved on the outer periphery of the sleeve, and the avoidance portion protrudes in a direction away from the axis of the sleeving portion.

[0014] In one embodiment, one of the outer wall of the sleeve or the inner wall of the snap ring is provided with a contact protrusion, and the other is provided with a contact opening. The outer wall surface of the contact protrusion abuts against the inner edge of the contact opening.

[0015] In one embodiment, the contact portion of the contact protrusion is hemispherical, and the equivalent radius of the contact portion is greater than the equivalent radius of the contact opening.

[0016] In one embodiment, the snap ring is cylindrical. The snap ring extends from the installation opening toward one side of the valve body. The contact opening is a contact through hole, and the contact through hole is provided on the snap ring.

[0017] In one embodiment, the contact through hole is provided on the cylindrical wall of the sleeving portion.

[0018] In one embodiment, the cylindrical wall of the avoidance portion is arc-shaped and protrudes outward toward a side away from the sleeving portion.

[0019] In one embodiment, the snap ring further has a guiding portion. The guiding portion is connected between the cylindrical wall of the sleeving portion and the cylindrical wall of the avoidance portion, and is arc-shaped and convex inward toward a side close to the sleeving portion.

[0020] In one embodiment, the snap ring has no less than 1 avoidance portion, and no less than 1 avoidance portion is arranged along the outer peripheral side of the sleeving portion.

[0021] In one embodiment, the snap ring has no less than 1 contact through hole, and no less than 1 contact through hole is evenly distributed circumferentially along the cylindrical wall of the sleeving portion.

[0022] In one embodiment, the coil assembly includes a coil bracket, an upper pole plate, a lower pole plate, and windings. The windings are looped around the coil bracket. The upper pole plate and the lower pole plate are oppositely arranged at both ends of the coil bracket, and the spring seat is connected to the lower pole plate.

[0023] In one embodiment, after the spring seat is fixedly connected to the lower pole plate, it is integrally injection-molded with the coil assembly.

[0024] The present invention also provides a refrigeration device, which includes the electronic expansion valve as described above. The electronic expansion valve includes a housing, a coil assembly, a rotor assembly, a sleeve, a valve body and a snap ring. The housing has a receiving cavity and an installation opening communicating with the receiving cavity; the coil assembly is arranged in the receiving cavity; the rotor assembly is arranged in the coil assembly and extends out through the installation opening; the sleeve sleeves the rotor assembly and is located between the coil assembly and the rotor assembly, and one end of the sleeve extends out through the installation opening; the valve body is connected to the end of the sleeve extending out of the installation opening; the snap ring includes a spring seat and a snap ring arranged on the spring seat. The spring seat is arranged in the housing and connected to the coil assembly. The snap ring extends out through the installation opening and is sleeved on the outer periphery of the sleeve, and the snap ring elastically abuts against the sleeve or the valve body.

[0025] The electronic expansion valve of the present invention includes a housing, a coil assembly, a rotor assembly, a sleeve, a valve body and a snap ring. The housing has a receiving cavity and an installation opening communicating with the receiving cavity; the coil assembly is arranged in the receiving cavity; the rotor assembly is arranged in the coil assembly and extends out through the installation opening; the sleeve sleeves the rotor assembly and is located between the coil assembly and the rotor assembly, and one end of the sleeve extends out through the installation opening; the valve body is connected to the end of the sleeve extending out of the installation opening; the snap ring includes a spring seat and a snap ring arranged on the spring seat. The spring seat is arranged in the housing and connected to the coil assembly. The snap ring extends out through the installation opening and is sleeved on the outer periphery of the sleeve, and the snap ring elastically abuts against the sleeve or the valve body. In this application, the spring seat is fixedly connected to the housing and the coil assembly, and then the snap ring fixedly connected to the spring seat is sleeved on the outer periphery of the sleeve, and the snap ring extends along the axial direction of the sleeve. Through the elastic abutment between the snap ring and the sleeve or the valve body, the elastic pre-tightening force generated by the radial deformation of the snap ring is used to tightly hold the snap ring on the outer side of the sleeve or the valve body, so as to fix the axial and circumferential positions of the coil assembly outside the sleeve, thereby improving the positioning stability of the coil assembly in the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0027] Figure 1 It is a schematic structural diagram of an embodiment of the electronic expansion valve of the present invention;

[0028] Figure 2 is Figure 1 the bottom view of the electronic expansion valve in

[0029] Figure 3 is Figure 2 the sectional view taken along line A-A in

[0030] Figure 4 is Figure 3 the enlarged view of part A in

[0031] Figure 5 the structural schematic diagram of an embodiment of the circlip in the electronic expansion valve;

[0032] Figure 6 the structural schematic diagram of another embodiment of the circlip in the electronic expansion valve;

[0033] Figure 7 the structural schematic diagram of still another embodiment of the circlip in the electronic expansion valve;

[0034] Figure 8 the structural schematic diagram of another embodiment of the electronic expansion valve of the present invention.

[0035] Explanation of the reference numerals in the drawings:

[0036] Label Name Label Name 10 Electronic expansion valve 14 Valve body 11 Outer shell 141 Medium inlet 111 Accommodation cavity 142 Medium outlet 111a Installation port 15 Circlip 111b Glue injection hole 151 Spring seat 12 Coil assembly 151a Glue passing hole 121 Coil bracket 152 Snap ring 122 Upper electrode plate 152a Butting opening 123 Lower electrode plate 152b Avoidance part 13 Casing 152c Socket part 131 Butting protrusion 152d Guiding part

[0037] The realization of the object of the present invention, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0040] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where both A and B are satisfied simultaneously. In addition, the technical solutions between the respective embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention provides an electronic expansion valve.

[0042] In an embodiment of the present invention, as Figures 1 to 4 shown, the electronic expansion valve 10 includes a housing 11, a coil assembly 12, a rotor assembly, a sleeve 13, a valve body 14, and a snap ring 15. The housing 11 has a receiving cavity 111 and an installation opening 111a communicating with the receiving cavity 111. The coil assembly 12 is disposed in the receiving cavity 111. The rotor assembly is disposed in the coil assembly 12 and extends out through the installation opening 111a. The sleeve 13 sleeves the rotor assembly and is located between the coil assembly 12 and the rotor assembly. One end of the sleeve 13 extends out through the installation opening 111a. The valve body 14 is connected to the end of the sleeve 13 extending out of the installation opening 111a. The snap ring 15 includes a spring seat 151 and a snap ring 152 disposed on the spring seat 151. The spring seat 151 is disposed in the housing 11 and is connected to the coil assembly 12. The snap ring 152 extends out through the installation opening 111a and sleeves the outer periphery of the sleeve 13. The snap ring 152 elastically abuts against the sleeve 13 or the valve body 14.

[0043] Specifically, in the embodiment of the present invention, the electronic expansion valve 10 includes a housing 11. The shape of the housing 11 has various forms. The housing 11 can be generally cylindrical, cubic, spherical, etc. No special limitation is made here. The housing 11 can be injection-molded from an elastic resin material, so that the housing does not have conductivity and can also have a certain elasticity, improving the safety performance and ease of installation of the electronic expansion valve 10. Of course, the housing 11 can also be stamped from a metal sheet, so that the housing 11 has rigidity and elasticity at the same time. Since the metal sheet has conductivity, in order to insulate the housing 11, an insulating layer can be provided on the inner and outer sides of the housing 11 to prevent the metal sheet from conducting the inside and outside of the housing 11, improving the safety performance of the electronic expansion valve 10. The housing 11 has a receiving cavity 111. An installation port 111a is provided outside the receiving cavity 111. The installation port 111a communicates the receiving cavity 111 and the outer surface of the housing 11.

[0044] In the embodiment of the present invention, the electronic expansion valve 10 further includes a coil assembly 12 and a rotor assembly. The coil assembly 12 is fixedly arranged in the receiving cavity 111. The rotor assembly is detachably arranged in the coil assembly 12 via the installation port 111a. The coil assembly 12 does not rotate during operation. The coil assembly 12 is used to generate a rotating magnetic field when powered on to drive the rotor assembly arranged in the coil assembly 12 to rotate. The rotor assembly can be a permanent magnet. The rotor assembly generates a corresponding magnetic field to be driven by the rotating magnetic field generated by the coil assembly 12 to rotate.

[0045] In the embodiment of the present invention, the electronic expansion valve 10 may further include a sleeve 13. The sleeve 13 can be a hollow cylindrical component with an opening at one end and a closed end at the other end, or a hollow cylindrical component with both ends open. No special limitation is made here. Specifically, the sleeve 13 is sleeved on the outer periphery of the rotor assembly and has a clearance fit with the rotor assembly, so that the rotor assembly can be rotatably arranged relative to the sleeve 13. The sleeve 13 is located between the rotor assembly and the coil assembly 12. The rotor assembly is rotatably arranged in the sleeve 13, and the coil assembly 12 is disposed around the outer periphery of the part of the sleeve 13 extending into the receiving cavity 111.

[0046] In an embodiment of the present invention, the electronic expansion valve 10 further includes a valve body 14. The valve body 14 includes a valve cavity and a valve port communicating with the valve cavity. One end of the sleeve 13 extending out of the mounting port 111a is connected to the valve body 14 and is connected to the valve cavity. A medium inlet 141 and a medium outlet 142 are respectively provided on two adjacent or opposite side walls of the valve body 14. The medium inlet 141 is used for the medium to flow in, and the medium outlet 142 is used for the medium to flow out. The medium inlet 141 can be communicated with the medium outlet 142 through the valve port. Thus, the medium can reach the valve cavity through the medium inlet 141, and then flow to the medium outlet 142 through the valve port communicating with the valve cavity, thereby forming a medium flow passage.

[0047] In an embodiment of the present invention, the electronic expansion valve 10 further includes a valve core assembly. The valve core assembly includes a screw, a nut member, a valve needle member, etc. The screw is threadedly connected to the nut member, and the screw is disposed through the nut member. The rotor assembly is sleeved on the nut member and is fixedly connected to the screw. The valve needle assembly is movably disposed in the valve cavity, and the tip of the valve needle assembly abuts against the valve port. When the coil assembly 12 is in an energized state, the rotor assembly can drive the screw to move up and down. The lower end of the screw is connected to the valve needle member, and the valve needle member is driven to move up and down by the up and down movement of the screw to control the flow rate of the medium. The valve needle member includes a valve needle, a valve needle seat, and a pre-tightening spring. One end of the screw is disposed through one end of the valve needle seat, the valve needle is disposed through the other end of the valve needle seat, and the pre-tightening spring is disposed in the valve needle seat and is located between the screw and the valve needle. The pre-tightening spring has a pre-tightening force in the valve needle seat to ensure that the valve needle abuts against the valve port when the valve body 14 is in a closed state.

[0048] In an embodiment of the present invention, the electronic expansion valve 10 further includes a snap ring 15. The snap ring 15 in the present application can be integrally formed by stamping or forging, etc., and no special limitation is made here. The snap ring 15 includes a spring seat 151 and a snap ring 152 provided on the spring seat 151. The spring seat 151 is generally annularly arranged, and the snap ring 152 is generally cylindrically arranged. One end of the snap ring 152 is connected to the spring seat 151, and the other end extends toward the direction of the valve body 14. The spring seat 151 is arranged in the housing 11 and is connected to the coil assembly 12. The snap ring 152 extends out from the mounting opening 111a and is sleeved on the outer periphery of the sleeve 13. The snap ring 152 is elastically abutted against the sleeve 13 or the valve body 14. Specifically, the snap ring 152 is sleeved on the outside of the sleeve 13 and is tightly connected to the outer side wall of the sleeve 13, so that the snap ring 152 and the sleeve 13 can be in full contact, and the pre-tightening force of the elastic abutment between the snap ring 152 and the sleeve 13 is improved. During installation, the sleeve first passes through the snap ring 15 provided on the mounting opening 111a, and then passes through the mounting opening 111a and is inserted into the coil assembly 12 provided in the accommodation cavity 111. Among them, since the snap ring 152 has the ability of elastic deformation, under the action of an external force, the sleeve 13 can pass through the snap ring 152 and enter the coil assembly 12. After the external force is withdrawn, the snap ring 152 can use its own radial elastic pre-tightening force to press the inner wall of the snap ring 152 against the sleeve 13 or the valve body 14. At the same time, the snap ring 152 extends along the axial direction of the sleeve 13, increasing the contact area with the sleeve 13, so that the coil assembly 12 can be stably fixed on the sleeve 13 or the valve body 14 in the axial and circumferential directions.

[0049] The electronic expansion valve 10 of the present invention includes a housing 11, a coil assembly 12, a rotor assembly, a sleeve 13, a valve body 14 and a snap ring 15. The housing 11 has a receiving cavity 111 and an installation opening 111a communicating with the receiving cavity 111. The coil assembly 12 is arranged in the receiving cavity 111. The rotor assembly is arranged in the coil assembly 12 and extends out through the installation opening 111a. The sleeve 13 sleeves the rotor assembly and is located between the coil assembly 12 and the rotor assembly. One end of the sleeve 13 extends out through the installation opening 111a. The valve body 14 is connected to one end of the sleeve 13 extending out of the installation opening 111a. The snap ring 15 includes a spring seat 151 and a snap ring 152 arranged on the spring seat 151. The spring seat 151 is arranged in the housing 11 and is connected to the coil assembly 12. The snap ring 152 extends out through the installation opening 111a and sleeves the outer periphery of the sleeve 13. The snap ring 152 is elastically abutted against the sleeve 13 or the valve body 14. In this application, the spring seat 151 is fixedly connected to the housing 11 and the coil assembly 12, and then the snap ring 152 fixedly connected to the spring seat 151 is sleeved on the outer periphery of the sleeve 13, and the snap ring 152 extends along the axial direction of the sleeve 13. Through the elastic abutment between the snap ring 152 and the sleeve 13 or the valve body 14, the elastic pre-tightening force generated by the radial deformation of the snap ring 152 is used to tightly hold the snap ring 152 on the outer side of the sleeve 13 or the valve body 14, so as to fix the axial and circumferential positions of the coil assembly 12 outside the sleeve 13, thereby improving the positioning stability of the coil assembly 12 in the electronic expansion valve 10.

[0050] Refer to Figures 3 to 4, Further, in one embodiment, one of the outer wall of the sleeve 13 or the inner wall of the snap ring 152 is provided with an abutting protrusion 131, and the other is provided with an abutting opening 152a. The outer wall surface of the abutting protrusion 131 abuts against the inner edge of the abutting opening 152a. To improve the axial and circumferential limitation of the snap spring 15 between the coil assembly 12 and the sleeve 13 or the valve body 14. Optionally, the abutting protrusion 131 can be provided on the outer wall of the sleeve 13, and the corresponding abutting opening 152a can be opened on the inner wall of the snap ring 152; alternatively, the abutting protrusion 131 can be provided on the inner wall of the snap ring 152, and the corresponding abutting opening 152a can be provided on the outer wall of the sleeve 13. In this application, taking the abutting protrusion 131 being provided on the outer wall of the sleeve 13 and the abutting opening 152a being provided on the inner wall of the snap ring 152 as an example for illustration, other embodiments can be implemented with reference to this embodiment, and no special limitation is made here. Among them, the abutting protrusion 131 can be a convex bump or an elastic arm, etc., and the abutting opening 152a can be a through hole, a groove or a notch, and no special limitation is made here. In this embodiment, the sleeve 13 abuts against the inner edge of the corresponding abutting opening 152a on the snap ring 152 through the outer wall surface of the abutting protrusion 131, so that the circumferential direction of the abutting protrusion 131 can be limited. Then, since the snap ring 152 is sleeved on the sleeve 13, the snap ring 152 can be positioned and fixed axially and circumferentially on the sleeve 13, thereby improving the connection and positioning stability between the coil and the sleeve 13.

[0051] Refer to Figures 3 to 4, in one embodiment, the abutting portion of the abutting protrusion 131 is hemispherical, and the equivalent radius of the abutting portion is greater than the equivalent radius of the abutting opening 152a. In order to enable better abutting and limiting between the abutting protrusion 131 and the abutting opening 152a, and to prevent looseness when the snap ring 152 is sleeved outside the sleeve 13 due to the fitting gap between the abutting opening 152a and the abutting protrusion 131, which may cause inaccurate positioning of the coil assembly 12, thereby affecting the opening degree of the valve port and further affecting the control of the medium flow rate, resulting in the failure of the electronic expansion control. In this embodiment, the abutting portion of the abutting protrusion 131 in contact with the abutting opening 152a is set to be hemispherical. Of course, in other embodiments, it may also be conical or trapezoidal, etc., which is not specifically limited here. By setting the equivalent radius of the abutting portion to be greater than the radius of the abutting opening 152a, the circumferential abutting between the outer edge of the hemispherical shape with gradually expanding or shrinking and the inner edge of the abutting opening 152a can be utilized, so as to better utilize the abutting between the abutting protrusion 131 and the abutting opening 152a to position the coil assembly 12 and the sleeve 13. Improve the axial and circumferential limiting of the snap ring 15 on the coil assembly 12 and the sleeve 13.

[0052] Refer to Figures 3 to 7 , in one embodiment, the snap ring 152 is cylindrical, the snap ring 152 extends from the installation port 111a towards the side of the valve body 14, and the abutting opening 152a is an abutting through hole provided on the snap ring 152. It can be understood that, in order to improve the axial and circumferential fitting degree between the snap ring 152 and the sleeve 13 or the valve body 14, the snap ring 152 is set to be cylindrical in this application, and the snap ring 152 extends from the installation port 111a towards the side of the valve body 14 to increase the fitting area between the snap ring 152 and the sleeve 13 or the valve body 14, thereby improving the connection and positioning stability between the snap ring 152 and the sleeve 13 or the valve body 14. At the same time, it can also play a guiding role when the sleeve 13 is inserted into the accommodation cavity 111 through the installation port 111a. The abutting through hole is provided on the snap ring 152 to cooperate with the abutting protrusion 131 provided on the sleeve 13 to realize the positioning of the snap ring 152 on the sleeve 13.

[0053] Refer to Figures 4 to 7, in one embodiment, the snap ring 152 has a sleeving portion 152c and an avoidance portion 152b. The sleeving portion 152c is sleeved on the outer periphery of the sleeve 13, and the avoidance portion 152b protrudes in a direction away from the axis of the sleeving portion 152c. It can be understood that, in order to simplify the assembly process between the snap spring 15 and the sleeve 13, so that the sleeve 13 with the abutting protrusion 131 can be simply and quickly installed with the snap spring 15, the present application is provided with an avoidance portion 152b on the sleeving portion 152c of the snap ring 152 sleeved on the outer periphery of the sleeve 13 in a direction away from the axis. The avoidance portion 152b can be set according to the number of the abutting protrusions 131 provided on the outer wall of the sleeve 13, and no special limitation is made here. During assembly, first align the abutting protrusion 131 on the sleeve 13 with the avoidance portion 152b. Through the avoidance of the abutting protrusion 131 by the avoidance portion 152b, the sleeve 13 can be relatively simply inserted into the snap ring 152. After the abutting protrusion 131 reaches the corresponding position, then by rotating the sleeve 13 or the snap ring 152, the abutting protrusion 131 and the abutting through hole are abutted, so as to complete the assembly positioning between the snap spring 15 and the sleeve 13. Specifically, the abutting through hole is provided on the barrel wall of the sleeving portion 152c.

[0054] Referring to Figures 4 to 7 , the barrel wall of the avoidance portion 152b is arranged in an arc shape protruding outward on the side away from the sleeving portion 152c. It can be understood that the shape of the avoidance portion 152b can be set to be similar to the abutting protrusion 131, or it can be neither similar nor close, as long as it can avoid the abutting protrusion 131, and no special limitation is made here. In the embodiment of the present application, the barrel wall of the avoidance portion 152b is arranged in an arc shape protruding outward on the side away from the sleeving portion 152c. In this way, it can avoid the abutting protrusion 131 and increase the opening degree between the barrel walls of the sleeving portion 152c, so as to improve the elasticity between the barrel walls of the sleeving portion 152c and the elastic pre-tightening force during the elastic abutment between the sleeving portion 152c and the sleeve 13. At the same time, setting the barrel wall of the avoidance portion 152b to have an arc transition can improve the overall structural strength of the snap ring 152.

[0055] Referring to Figures 4 to 7, in one embodiment, the snap ring 152 further has a guiding portion 152d. The guiding portion 152d is connected between the barrel wall of the sleeving portion 152c and the barrel wall of the avoiding portion 152b, and is arranged in an arc shape that protrudes inward toward the side close to the sleeving portion 152c. It can be understood that when assembling the snap ring 152 and the sleeve, the abutting protrusion 131 passes through the avoidance of the avoiding portion 152b. After the abutting protrusion 131 reaches the corresponding preset position, the sleeve 13 or the snap ring 152 is rotated to make the abutting protrusion 131 abut against the abutting through hole. In this embodiment, in order to reduce the friction at the connection between the abutting protrusion 131 and the barrel walls of the sleeving portion 152c and the avoiding portion 152b, and to facilitate the rotation of the sleeve 13 or the snap ring 152, the guiding portion 152d is provided at the connection between the barrel walls of the sleeving portion 152c and the avoiding portion 152b. The guiding portion 152d is arranged in an arc shape that protrudes inward toward the side close to the sleeving portion 152c, so that the barrel walls of the sleeving portion 152c and the avoiding portion 152b are smoothly connected and transitioned, which can play a guiding role for the abutting protrusion 131, and can also reduce the friction between the abutting protrusion 131 and the barrel wall of the snap ring 152, reduce the wear of the abutting protrusion 131 or the snap spring 15, and improve the connection stability and service life of the electronic expansion valve 10.

[0056] Referring to Figures 5 to 6 , in one embodiment, the snap ring 152 has at least one avoiding portion 152b, and at least one avoiding portion 152b is arranged along the outer peripheral side of the sleeving portion 152c. Optionally, the snap ring 152 can be provided with 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or the like of the avoiding portions 152b. The avoiding portion 152b can be set according to the number of the abutting protrusions 131 on the sleeve 13 to avoid the abutting protrusions 131. When a plurality of the abutting protrusions 131 are arranged along the outer peripheral wall of the sleeve, the corresponding avoiding portions 152b are also evenly arranged along the outer peripheral side of the sleeving portion 152c. Of course, in other embodiments, a plurality of the abutting protrusions 131 can also be unevenly arranged on the outer peripheral wall of the sleeve, and the corresponding avoiding portions 152b can also be unevenly arranged along the outer peripheral side of the sleeving portion 152c. In the embodiment of the present application, two abutting protrusions 131 that are symmetric along the axial direction are provided on the outer peripheral wall of the sleeve 13, and two avoiding portions 152b that are symmetric along the axial direction are correspondingly arranged on the outer peripheral side of the sleeving portion 152c of the snap ring 152 to avoid the abutting protrusions 131. Other embodiments can be implemented with reference to this embodiment.

[0057] Referring toFigures 5 to 6 In one embodiment, the snap ring 152 has no less than 1 abutting through hole, and no less than 1 abutting through hole is evenly distributed circumferentially along the cylinder wall of the socket part 152c. Optionally, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 abutting through holes may be provided on the snap ring 152, and the abutting through holes may be set according to the requirements of multi-stage regulation of the medium flow rate and the number of the abutting protrusions 131 provided. No special limitation is made here. In the embodiment of the present application, 6 abutting through holes are provided on the cylinder wall of the socket part 152c, and the 6 abutting through holes are symmetrically arranged in three and three axes on the cylinder wall of the socket part 152c. In this way, multi-stage regulation of the abutting protrusion 131 can be realized to meet the requirements of different customers or different products in use for different medium flow rates, and at the same time, it can prevent the abutting protrusion 131 from rotating in place, causing the problem of increased cost due to repeated assembly, and improving the enterprise efficiency.

[0058] Specifically, the abutting through hole is formed by stamping from the inner wall to the outer wall of the snap ring 152. In this way, burrs on the inner edge of the abutting through hole can be reduced, so as to reduce the friction generated by the burrs generated during the stamping of the abutting through hole on the abutting protrusion 131 and improve the service life of the abutting protrusion 131.

[0059] Refer to Figure 3 In one embodiment, the coil assembly 12 includes a coil bracket 121, an upper pole plate 122, a lower pole plate 123 and windings. The windings are looped on the coil bracket 121. The upper pole plate 122 and the lower pole plate 123 are oppositely arranged at both ends of the coil bracket 121, and the spring seat 151 is connected to the lower pole plate 123. It can be understood that the coil bracket 121 is circumferentially arranged in the accommodating cavity 111, and a sleeve channel is provided in the middle for the sleeve to pass through. The windings are wound on the coil bracket 121, and the upper pole plate 122 and the lower pole plate 123 are respectively fixedly connected to both ends of the coil bracket 121 along the axis direction of the sleeve to fix the coil bracket 121 and conduct electrical connection with the outside. The side of the lower pole plate 123 close to the housing 11 is connected to the spring seat 151.

[0060] Refer to Figure 8 In one embodiment, according to customer requirements, a glue injection hole 111b may be provided on the side of the housing 11 close to the valve body 14. A glue passing port 151a is provided on the spring seat. The glue passing port 151a is oppositely arranged to the glue injection hole 111b. In this way, the insulating colloid can be injected from the glue injection hole 111b onto the windings, so that the windings are insulated from each other, preventing the windings from short-circuiting and improving the reliability of the electronic expansion valve 10.

[0061] In one embodiment, after the spring seat 151 is fixedly connected to the lower pole plate 123, it is integrally injection-molded with the coil assembly 12. In order to improve the connection stability between the snap spring 15, the outer shell 11, and the coil assembly 12, in this application, after the spring seat 151 is fixedly connected to the lower pole plate 123, it can be injection-molded with the coil assembly 12. Thereby, the connection stability between the coil assembly 12, the snap spring 15, and the outer shell 11 is improved. Among them, the fixed connection method can be welding or hot melting, etc., and no special limitation is made here.

[0062] The present invention also provides a refrigeration device, which includes an electronic expansion valve 10. The specific structure of the electronic expansion valve 10 refers to the above embodiments. Since this refrigeration device adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0063] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that, Comprising: A housing having a receiving cavity and a mounting opening communicating with the receiving cavity; A coil assembly disposed within the receiving cavity; A rotor assembly disposed within the coil assembly and extending out through the mounting opening; A sleeve sleeving the rotor assembly and located between the coil assembly and the rotor assembly, one end of the sleeve extending out through the mounting opening; A valve body connecting to the end of the sleeve extending out of the mounting opening; and A snap ring including a spring seat and a retaining ring provided on the spring seat, the spring seat being disposed within the housing and connecting to the coil assembly, the retaining ring extending out through the mounting opening and sleeving on the outer periphery of the sleeve, the retaining ring elastically abutting against the sleeve or the valve body, the retaining ring having a sleeving portion and an avoidance portion, the sleeving portion sleeving on the outer periphery of the sleeve, the avoidance portion protruding in a direction away from the axis of the sleeving portion, the cylindrical wall of the avoidance portion being arcuately convex towards the side away from the sleeving portion, the retaining ring further having a guiding portion connecting between the cylindrical wall of the sleeving portion and the cylindrical wall of the avoidance portion and being arcuately convex towards the side close to the sleeving portion.

2. The electronic expansion valve according to claim 1, characterized in that, One of the outer wall of the sleeve or the inner wall of the retaining ring is provided with an abutting protrusion, and the other is provided with an abutting opening, and the outer wall surface of the abutting protrusion abuts against the inner edge of the abutting opening.

3. The electronic expansion valve according to claim 2, characterized in that, The abutting portion of the abutting protrusion is hemispherical, and the equivalent radius of the abutting portion is greater than the equivalent radius of the abutting opening.

4. The electronic expansion valve according to claim 3, wherein, The retaining ring is cylindrical, the retaining ring extending from the mounting opening towards the side of the valve body, and the abutting opening is an abutting through hole provided on the retaining ring.

5. The electronic expansion valve according to claim 4, characterized in that, The abutting through hole is provided on the cylindrical wall of the sleeving portion.

6. The electronic expansion valve according to claim 1, wherein The retaining ring has at least 1 avoidance portion, and at least 1 avoidance portion is arranged along the outer peripheral side of the sleeving portion.

7. The electronic expansion valve according to claim 6, wherein, The retaining ring has at least 1 abutting through hole, and at least 1 abutting through hole is evenly distributed circumferentially along the cylindrical wall of the sleeving portion.

8. The electronic expansion valve according to claim 2, wherein The coil assembly includes a coil bracket, an upper pole plate, a lower pole plate and a winding, the winding being annularly arranged on the coil bracket, the upper pole plate and the lower pole plate being oppositely arranged at both ends of the coil bracket, and the spring seat being connected to the lower pole plate.

9. The electronic expansion valve according to claim 8, wherein, After the spring seat is fixedly connected to the lower pole plate, it is integrally injection-molded with the coil assembly.

10. A refrigeration device, the refrigeration device including an electronic expansion valve as described in any one of claims 1-9.

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