Electronic expansion valves and cooling equipment

Abstract

This application discloses an electronic expansion valve and a refrigeration device. The electronic expansion valve includes a valve seat (110) having a valve chamber (101), a nut (210) having an annular positioning portion (211) protruding from the outer wall thereof for abutting against and positioning the chamber wall of the valve seat (110), one end of the nut (210) attached to the valve chamber (101), and a connecting piece (220) having one end fixedly connected to the nut (210) and the other end extending away from the nut (210) and fixedly connected to an axial end face of the valve seat (110).

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority from a Chinese patent application filed on December 14, 2020, bearing application number 202011483239.0, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the technical field of fluid control, and more particularly to electronic expansion valves and refrigeration equipment. [Background technology]

[0003] 2. Description of the Related Art In air conditioners, refrigerators, heat pump water heaters, and various other cooling and heating appliances, electronic expansion valves are generally used to adjust the flow rate of fluid.

[0004] In the related art, an electronic expansion valve typically includes a valve seat assembly with a valve port, a nut assembly, and a valve needle assembly, and the valve needle assembly moves relative to the nut assembly to drive the valve needle to open or close the valve port, thereby achieving the function of adjusting the flow rate. In the prior art, when the various components within the electronic expansion valve work together, the electronic expansion valve is prone to sticking, which affects the operating performance of the electronic expansion valve. Summary of the Invention [Problem to be solved by the invention]

[0005] The main objective of the present application is to propose an electronic expansion valve that aims to solve the phenomenon in the prior art that electronic expansion valves tend to stick. [Means for solving the problem]

[0006] To achieve the above object, the present application proposes an electronic expansion valve including: a valve seat having a valve chamber; a nut having an annular positioning portion protruding from an outer wall thereof for abutting against a chamber wall of the valve chamber to position it; one end of the nut disposed within the valve chamber; and a connecting piece having one end fixedly connected to the nut and the other end extending away from the nut and fixedly connected to an axial end face of the valve seat.

[0007] In one embodiment of the present application, the positioning portion includes a cylindrical connecting segment that is interference-fitted to the inner wall of the valve seat.

[0008] In one embodiment of the present application, the positioning portion further includes a guide segment provided on a side of the connection segment away from the connection piece and connected to the connection segment, and the outer diameter of the guide segment is smaller than the outer diameter of the connection segment.

[0009] In one embodiment of the present application, the outer diameter of the guiding segment tapers from the end connected to the connecting segment towards the end remote from the connecting segment.

[0010] In one embodiment of the present application, a balance passage is provided between the positioning portion and the valve seat, which connects both sides of the positioning portion in the axial direction.

[0011] In one embodiment of the present application, the connection piece is provided with a balance hole that connects both axial ends of the connection piece and communicates with the balance passage.

[0012] In one embodiment of the present application, the connecting piece is installed at a distance from the positioning part, the connecting piece, the positioning part and the valve seat surround a first chamber, and the balance passage and the balance hole are both connected to the first chamber.

[0013] In one embodiment of the present application, the balance passage is provided in the positioning portion.

[0014] In one embodiment of the present application, the balance passage is provided in the valve seat.

[0015] In one embodiment of the present application, the connection piece is fixed to the valve seat by welding.

[0016] In one embodiment of the present application, the electronic expansion valve further includes a valve stem, a valve needle connected to the valve stem, and a valve disc seat provided on the valve seat. The nut includes a threaded segment adapted to be fitted with the valve stem, and a fixed segment connected to the threaded segment, extending toward the valve disc seat, and adapted to be fitted with the valve needle to guide the valve needle. The connecting piece and the positioning portion are both provided on the outer wall of the fixed segment.

[0017] In one embodiment of the present application, the fixed segment comprises: an attachment portion connected to the screw segment, the connection piece and the positioning portion both being installed on an outer wall; The valve body includes an extension portion having one end connected to the mounting portion and the other end extending in the axial direction toward the valve body seat.

[0018] In one embodiment of the present application, an outer wall of the extension portion and the positioning portion are arranged in a stepped manner, and an outer diameter of the extension portion is smaller than an outer diameter of the positioning portion.

[0019] In one embodiment of the present application, the extension is disposed with a gap between it and the valve seat.

[0020] In one embodiment of the present application, the extension portion is provided with a flow guide through hole.

[0021] In one embodiment of the present application, a plurality of the flow guide through holes are provided, and the plurality of flow guide through holes are provided at intervals around the periphery of the extension portion.

[0022] In one embodiment of the present application, the extension portion, the mounting portion, and the positioning portion are integrally formed.

[0023] To achieve the above object, the present application further provides a refrigeration device including the above-mentioned electronic expansion valve, which includes a valve seat having a valve chamber, a nut having an annular positioning portion protruding from an outer wall thereof for abutting against a chamber wall of the valve chamber to position it, one end of the nut being disposed within the valve chamber, and a connecting piece having one end fixedly connected to the nut and the other end extending away from the nut and fixedly connected to an axial end face of the valve seat. [Effects of the Invention]

[0024] In the electronic expansion valve according to the technical solution of the present application, the nut assembly is improved so that it includes a nut and a connecting piece fixedly connected to the nut, and the nut has a circular positioning portion protruding from its outer wall, which abuts against the chamber wall of the valve chamber to position it, and one end of the nut is located within the valve chamber at the valve seat, thereby realizing radial positioning of the nut and the valve seat. The connecting piece has one end fixedly connected to the nut and the other end extending away from the nut and fixedly connected to the axial end face of the valve seat, thereby realizing axial positioning of the nut and the valve seat, thereby realizing both axial and radial positioning functions of the nut and the valve seat, thereby ensuring the positioning and fitting of the nut and the valve seat, and further ensuring the coaxiality of the nut and the valve seat, preventing the electronic expansion valve from sticking, and improving the operating performance of the electronic expansion valve. [Brief explanation of the drawings]

[0025] In order to more clearly explain the technical solutions of the embodiments of the present application and the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. It is clear that the accompanying drawings in the following description are only some of the embodiments of the present application, and those skilled in the art can obtain other accompanying drawings from the structures shown in these accompanying drawings without creative work.

[0026] [Figure 1] 1 is a structural schematic diagram of an electronic expansion valve according to an embodiment of the present invention; [Figure 2]2 is a schematic diagram of another structure of the electronic expansion valve according to the embodiment of the present invention; FIG. [Figure 3] 1 is a structural schematic diagram of an embodiment of a nut assembly in an electronic expansion valve of the present application. FIG. [Figure 4] 10 is a schematic diagram of one structure of fitting between a positioning portion and a valve seat in an embodiment of the present application. FIG. [Figure 5] 10A and 10B are schematic diagrams illustrating another structure of fitting between a positioning portion and a valve seat in an embodiment of the present application.

[0027] The realization of the object, function features and advantages of the present invention will be further explained in combination with the embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following will clearly and completely explain the technical solutions in the embodiments of the present application in combination with the drawings in the embodiments of the present application. It is clear that the described embodiments are not all of the embodiments of the present application, but only some of the embodiments of the present application. All other embodiments that can be obtained by those skilled in the art based on the embodiments of the present application without performing creative work belong to the scope of protection of the present application.

[0029] If the embodiments of the present application involve directional indications (e.g., up, down, left, right, front, back, etc.), it should be understood that the directional indications are used only to describe the relative positional relationships, movement conditions, etc. between each part in a specific position (as shown in the accompanying drawings), and if the specific position changes, the directional indications will also change accordingly.

[0030] Furthermore, when the embodiments of the present application refer to "first," "second," etc., the terms "first," "second," etc. are used for explanatory purposes only and should not be understood as indicating or implying the relative importance of the features or implicitly specifying the number of technical features presented. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of the features. Furthermore, the technical solutions of each embodiment may be combined with each other, provided that such combination is feasible by a person skilled in the art. If a combination of technical solutions is inconsistent or cannot be realized, it should be understood that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0031] This application proposes an electronic expansion valve.

[0032] In the present embodiment, as shown in FIGS. 1 to 5, the electronic expansion valve includes a valve seat assembly 100, a nut assembly 200, a valve needle assembly 300, and a housing 400.

[0033] The valve seat assembly 100 includes a valve seat 110 and a valve disc seat 120 having a valve port 121 . The housing 400 is disposed on the valve seat 110 and abuts against the valve seat 110, surrounding and forming an accommodating chamber that accommodates the nut assembly 200, the valve needle assembly 300, and the rotor assembly 500, thereby achieving the integrity and sealing of the entire structure of the electronic expansion valve. The nut assembly 200 is fixedly connected to the valve seat 110, and the valve needle assembly 300 is movably installed within the nut assembly 200. Therefore, the valve needle assembly 300 can move up and down in the axial direction of the nut assembly 200 to approach or move away from the valve port 121 of the valve disc seat 120, thereby achieving the function of closing or opening the valve port 121. In addition, by adjusting the distance of the valve needle assembly 300 from the valve disc seat 120 or the extent to which it extends into the valve port 121, the opening degree of the electronic expansion valve can be adjusted, thereby achieving the function of regulating the flow rate of fluid.

[0034] The nut assembly 200 includes a nut 210 having an annular positioning portion 211 protruding from its outer wall for abutting against the chamber wall of the valve chamber 101 of the valve seat 110 to position it, and one end of the nut 210 disposed within the valve chamber 101, and a connecting piece 220 having one end fixedly connected to the nut 210 and the other end extending away from the nut 210 and fixedly connected to the axial end face of the valve seat 110.

[0035] It can be seen that the nut 210 functions to mount and guide the valve needle assembly 300 so that the valve needle assembly 300 can move axially within the nut 210 to smoothly close or open the valve port 121. The connecting piece 220 functions to fixedly connect the nut 210 to the valve seat 110, thereby ensuring structural stability. A positioning portion 211 is protruded from the outer wall of the nut 210 and abuts against the inner wall of the valve seat 110 to position it, thereby achieving radial positioning of the nut 210 and the valve seat 110. At the same time, the connecting piece 220 is fixedly connected to the axial end surface of the valve seat 110, thereby realizing the axial positioning of the nut 210 and the valve seat 110, thereby ensuring both the radial and axial positioning functions of the nut 210 and the valve seat 110, i.e., the coaxiality between the nut 210 and the valve seat 110. Furthermore, the coaxiality between the nut 210 and the valve disc seat 120 on the valve seat 110 is guaranteed, which allows the valve needle assembly 300 to move in and out of the valve port 121 more smoothly, preventing the electronic expansion valve from sticking, and improving the operating performance of the electronic expansion valve.

[0036] In practical application, the shape and structure of the positioning portion 211 can be determined according to the actual situation, and can be, for example, a circular ring structure. When the positioning portion 211 has a circular ring structure, it surrounds the outer periphery of the nut 210 to form a ring structure concentric with the nut 210. In this case, the outer wall of the positioning portion 211 abuts against the inner wall of the valve seat 110, thereby ensuring radial positioning between the nut 210 and the valve seat 110. When the positioning portion 211 has a circular ring structure, the positioning portion 211 may have a circular ring-shaped ridge structure or a cylindrical structure with a fixed axial length. In this embodiment, a cylindrical structure with a fixed axial length is adopted as the positioning portion 211, taking into consideration the positioning effect and ease of processing. The abutment between the cylindrical outer surface of the positioning portion 211 and the cylindrical inner surface of the valve seat 110 further increases the contact area between them, improving the circumferential positioning effect.

[0037] In one embodiment, the installation position of the positioning portion 211 may be determined according to actual circumstances. As long as the positioning portion 211 can enter the valve chamber 101 of the valve seat 110 and abut against the inner wall of the valve seat 110 during installation, the position may be close to the valve disc seat 120 of the nut 210, close to the end face of the valve seat 110 of the nut 210, or corresponding to the center of the interior of the valve seat 110. Note that since the connecting piece 220 is connected between the nut 210 and the valve seat 110, its outer diameter is larger than the inner diameter of the valve seat 110. In one embodiment, the positioning portion 211 may be provided on the side of the connecting piece 220 facing the valve chamber 101. In actual installation, the connecting piece 220 is first fixedly connected to the nut 210, and then the side of the nut 210 with the positioning portion 211 provided thereon is inserted into the valve chamber 101 of the valve seat 110. At this time, the positioning portion 211 abuts against the inner wall of the valve seat 110 to ensure circumferential positioning, and also restricts the positions of the connecting piece 220 and the end faces of the valve seat 110 to position the nut 210 in the axial direction of the valve seat 110. Thereafter, the connecting piece 220 is fixedly connected to the valve seat 110, thereby realizing a stable fit between the nut 210 and the valve seat 110, facilitating installation, and ensuring concentricity between the nut 210 and the valve seat 110.

[0038] In one embodiment, the connecting piece 220 is fixed to the valve seat 110 by welding to ensure structural stability and prevent it from coming off due to the high internal pressure of the electronic expansion valve. The connecting piece 220 and the nut 210 may be molded as a single unit using a hot melt process. The connecting piece 220 is made of a metallic material, and the nut 210 is made of a non-metallic material.

[0039] In the electronic expansion valve according to the technical concept of the present application, the nut assembly 200 is improved so that it includes a nut 210 and a connecting piece 220 fixedly connected to the nut 210, and the nut 210 has a positioning portion 211 protruding from its outer wall for abutting against the chamber wall of the valve chamber 101 to position it, and one end of the connecting piece 220 is disposed within the valve chamber 101 on the valve seat 110, thereby realizing radial positioning of the nut 210 and the valve seat 110. The connecting piece 220 has one end fixedly connected to the nut 210 and the other end extending away from the nut 210 and fixedly connected to the axial end face of the valve seat 110, thereby realizing axial positioning of the nut 210 and the valve seat 110, thereby realizing both axial and radial positioning functions of the nut and the valve seat. This ensures the coaxiality between the nut 210 and the valve seat 110, and also the coaxiality between the nut 210 and the valve seat 120, preventing the electronic expansion valve from sticking and improving the operating performance of the electronic expansion valve.

[0040] To further improve the structural stability of the nut 210 and the valve seat 110, referring to FIGS. 1 to 3, in one embodiment of the present application, the positioning portion 211 includes a cylindrical connecting segment 211a that is tightly fitted into the inner wall of the valve seat 110. The connecting segment 211a functions to mount and position the valve seat 110. The connecting segment 211a is tightly fitted into the inner wall of the valve seat 110 to achieve a fixed connection between the connecting segment 211a and the valve seat 110, thereby ensuring the positioning effect between the fixing segment 211 and the valve seat 110 and thus ensuring the radial positioning effect between the nut 210 and the valve seat 110. Based on the above-described embodiment, the connecting segment 211a may also have a cylindrical structure. By making the outer wall of the connecting segment 211a cylindrical, the positioning area with the valve seat 110 can be increased, further ensuring the positioning effect.

[0041] In one embodiment, to facilitate installation, the positioning portion 211 further includes a guide segment 211b provided on the side of the connecting segment 211a closer to the valve body seat 120 and connected to the connecting segment 211a, and the outer diameter of the guide segment 211b is smaller than the outer diameter of the connecting segment 211a.

[0042] In actual installation, the side of the nut 210 provided with the positioning portion 211 is inserted into the valve seat 110, and since the outer diameter dimension of the connecting segment 211a of the positioning portion 211 and the inner diameter dimension of the valve seat 110 have an interference fit, a guide segment 211b whose outer diameter is smaller than that of the connecting segment 211a can be provided on the side of the connecting segment 211a closer to the valve disc seat 120. By making the outer diameter of the guide segment 211b smaller than the inner diameter of the valve seat 110, the guide segment 211b functions to guide the installation of the nut 210, allowing the positioning portion 211 to enter the valve chamber 101 of the valve seat 110 more quickly.

[0043] In one embodiment, the shape of the guide segment 211b can be determined according to actual circumstances, and can be, for example, a cylindrical structure, a conical structure, or a sloped structure. In this embodiment, taking into account the annular structures of the nut 210 and the valve seat 110 themselves, the guide segment 211b is annular in order to achieve better guiding performance. The outer wall of the guide segment 211b is formed as a conical surface, and the outer diameter of the guide segment 211b gradually decreases from the end connected to the connecting segment 211a toward the end away from the connecting segment 211a. The outer diameter of the positioning portion 211 gradually increases in the axial direction away from the valve disc seat 120 and then remains constant. In one embodiment, the outer wall of the positioning portion 211 is rounded at the connection between the guide segment 211b and the connecting end 211a to improve the smoothness of the connection between the guide segment 211b and the connecting end 211a. As a result, the guide of the guide segment 211b makes it easier for the connecting segment 211a to slide into the valve chamber 101 of the valve seat 110, improving the attachment efficiency of the positioning portion 211 and the valve seat 110.

[0044] In order to ensure the stability of the internal pressure of the electronic expansion valve, in one embodiment of the present application, referring to FIGS. 1 to 3, a balance passage 103 is provided between the positioning portion 211 and the valve seat 110, connecting both sides of the positioning portion 211 in the axial direction.

[0045] In addition, based on the above-mentioned embodiment, the outer wall of the positioning part 211 is tightly fitted into the chamber wall of the valve chamber 101. Therefore, the positioning and fitting of the positioning part 211 with the valve seat 110 divides the regions on both sides of the positioning part 211 in the axial direction into two regions. By providing a balance passage 103 between the positioning part 211 and the valve seat 110, the regions on both sides of the positioning part 211 in the axial direction, i.e., the upper region of the positioning part 211 and the lower valve chamber 101, are connected to each other. This ensures pressure balance on both sides of the positioning part 211 in the axial direction and prevents uneven pressure from affecting the performance of the electronic expansion valve.

[0046] In actual applications, the shape and structure of the balance passage 103 can be determined according to actual conditions, and can be, for example, a cylindrical through-hole, a tapered through-hole, an inclined through-hole, a curved through-hole, or other irregularly shaped through-hole. Of course, structures such as grooves and notches are also possible. The number of balance passages 103 can be determined according to actual conditions, and for example, multiple balance passages 103 can be provided at intervals around the periphery of the positioning portion 211 or on the inner wall of the valve seat 110 to allow the fluid to pass through the balance passages more uniformly.

[0047] 4 and 5, the installation position of the balance passage 103 may be determined according to actual conditions. For example, the balance passage 103 may be installed in the positioning portion 211, or the balance passage 103 may be provided on the inner wall of the valve seat 110. When the balance passage 103 is provided in the positioning portion 211, it may have a through-hole structure on the positioning portion 211, or may have a notch structure or groove structure recessed from the outer wall of the positioning portion 211. When the balance passage 103 is provided on the inner wall of the valve seat 110, it may have a notch structure or groove structure recessed from the inner wall of the valve seat 110.

[0048] In one embodiment, referring to FIGS. 1 to 3, the connecting piece 220 is provided with a balance hole 221 that connects both axial ends of the connecting piece 220 and communicates with the balance passage 103 .

[0049] One end of connecting piece 220 is fixed to nut 210 and the other end extends to valve seat 110, so that the chambers on both sides of connecting piece 220 are separated by connecting piece 220. To ensure pressure balance on both sides, balancing holes 221 are drilled in connecting piece 220 to connect balance passage 103 to the internal chamber of housing 400 and to connect valve chamber 101 to the internal chamber of housing 400, thereby ensuring pressure balance between valve chamber 101 and the internal chamber of housing 400, and thus ensuring pressure balance throughout the electronic expansion valve and improving the stability of the electronic expansion valve.

[0050] In practical application, the shape and structure of the balancing hole 221 can be determined according to the actual situation, for example, it can be a circular through-hole, a square through-hole, or a through-hole of other irregular shape, etc. In addition, a plurality of balancing holes 221 can be provided around the periphery of the connecting piece 220 and evenly spaced apart to achieve a better pressure balancing effect.

[0051] In one embodiment, referring to Figures 1 to 3, the connecting piece 220 is installed at a distance from the positioning portion 211, and the connecting piece 220, the positioning portion 211 and the valve seat 110 surround and form the first chamber 102, and both the balance passage 103 and the balance hole 221 are connected to the first chamber 102.

[0052] In practical application, the positioning portion 211 and the connecting piece 220 may be installed closely or spaced apart. Either method has little effect on the positioning or fitting function between the nut 210 and the valve seat 110. However, during the installation process, the positioning portion 211 is a protruding structure on the outer wall of the nut 210, and the positioning portion 211 and the nut 210 may be an integral structure. However, since the connecting piece 220 is made of metal, it must be fixed to the nut 210 by other methods such as hot melt or injection molding. Installing the connecting piece 220 and the positioning portion 211 with a gap provides a larger working space and simplifies the process compared to installing them closely.

[0053] In one embodiment, the connecting piece 220, the positioning part 211 and the valve seat 110 surround the first chamber 102, and the balance passage 103 and the balance hole 221 are both connected to the first chamber 102, thereby realizing the function of connecting the chambers in the housing 400, the first chamber 102 and the valve chamber 101 all together, and further achieving pressure balance in the internal chambers of the entire electronic expansion valve, thereby preventing pressure unevenness from affecting the performance of the electronic expansion valve.

[0054] 1 to 3, in one embodiment of the present application, the valve needle assembly 300 includes a valve stem 310 and a valve needle portion 320 disposed between the valve stem 310 and the valve disc seat 120. The nut 210 includes a threaded segment 212 that engages with the valve stem 310 and a fixed segment 213 that is connected to the threaded segment 212, extends toward the valve disc seat 120, and engages with the valve needle portion 320 to guide the valve needle portion 320. The connecting piece 220 and the positioning portion 211 are both provided on the outer wall of the fixed segment 213.

[0055] The threaded segment 212 and the fixed segment 213 are two axially opposite segments, and the valve stem 310 penetrates the threaded segment 212 and is threadedly engaged with the thread 212a of the threaded segment 212, so that the rotation of the valve stem 310 relative to the thread 212a of the threaded segment 212 is converted into axial movement of the valve stem 310, which further drives the axial movement of the valve needle 320. In order to ensure the stability of the movement of the valve needle 320, the inner wall of the fixed segment 213 is fitted to the valve needle 320 to guide the valve needle 320. The connecting piece 220 and the positioning piece 211 are both provided on the outer wall of the fixed segment 213, and the positioning and fitting functions of the positioning piece 211 and the connecting piece 220 relative to the valve seat 110 ensure the coaxiality of the fixed segment 213 and the valve seat 110. Meanwhile, the inner wall of the fixed segment 213 is fitted with the valve needle 320 to guide the valve needle 320, allowing the valve needle 320 to more smoothly enter the valve orifice 121 of the valve disc seat 120, thereby improving the performance of the electronic expansion valve.

[0056] Specifically, the fixed segment 213 includes an attachment portion 213a connected to the threaded segment 212, with the connecting piece 220 and the positioning portion 211 both installed on the outer wall, and an extension portion 213b having one end connected to the attachment portion 213a and the other end extending axially toward the valve disc seat 120. The attachment portion 213a functions for attachment and positioning, and both the connecting piece 220 and the positioning portion 211 are provided on the attachment portion 213a to ensure coaxiality between the attachment portion 213a and the valve seat 110. The extension portion 213b is connected to the attachment portion 213a and extends axially toward the valve disc seat 120 to ensure the guiding length of the valve needle portion 320 and further to ensure coaxiality between the valve needle portion 320 and the valve disc seat 120.

[0057] In one embodiment, the extending portion 213b, the mounting portion 213a, and the positioning portion 211 are integrally formed. In this embodiment, the nut 210 is provided with the extending portion 213b extending toward the valve disc seat 120, and the connecting piece 220 and the positioning portion 211 are used to position the nut 210 and the valve seat 110. This eliminates the need for a guide sleeve compared to the conventional technology in which a guide sleeve is provided between the nut 210 and the valve disc seat 120 for positioning, thereby reducing the number of processing and assembly steps and the manufacturing and assembly costs.

[0058] In one embodiment, the outer wall of the extension portion 213b and the positioning portion 211 are arranged in a stepped manner, and the outer diameter of the extension portion 213b is smaller than the outer diameter of the positioning portion 211. It can be seen that the extension portion 213b mainly functions to guide the internal valve needle portion 320. Meanwhile, the positioning portion 211 functions to abut against the inner wall of the external valve seat 110 for positioning. Therefore, by making the outer diameter of the extension portion 213b smaller than the outer diameter of the positioning portion 211, it is possible to ensure the positioning function with the valve seat 110 and the guiding function with respect to the valve needle portion 320 while saving material.

[0059] In one embodiment, the extension 213b is disposed with a gap between it and the valve disc seat 120. The nut 210 is positioned with the valve seat 110 by the connecting piece 220 and the positioning portion 211, thereby ensuring the concentricity between the nut 210 and the valve disc seat 120. At the same time, the extension 213b is engaged with the valve needle 320 so as to guide the valve needle 320, thereby enabling the valve needle 320 to be coaxial with the valve disc seat 120, eliminating the need for contact between the extension 213b and the valve disc seat 120. In one embodiment, the extension 213b is disposed with a gap between it and the valve disc seat 120 to reduce noise during fluid passage.

[0060] In one embodiment, the extension portion 213b is provided with a flow guide through hole 201. This flow guide through hole 201 may be a closed through hole or a notch. A plurality of the flow guide through holes 201 are provided, and the plurality of flow guide through holes 201 are spaced apart around the periphery of the extension portion 213b. By providing a plurality of flow guide through holes 201, the number of paths through which the fluid can enter the extension portion 213b is increased, and by providing a plurality of flow guide through holes 201 around the periphery of the extension portion 213b, the fluid can enter uniformly from the periphery of the extension portion 213b, thereby stabilizing the structure.

[0061] 1 to 3, in one embodiment, the valve needle portion 320 includes a valve needle sleeve 321 connected to the valve stem 310 and fitted so as to be guided by the inner wall of the fixed segment 213, and a valve needle 322 connected to the side of the valve needle sleeve 321 away from the valve stem 310, and the valve stem 310 can drive the valve needle 322 to approach or move away from the valve disc seat 120 in the axial direction of the nut 210, thereby closing or opening the valve port 121.

[0062] In one embodiment of the present application, referring to Figures 1 to 3, the electronic expansion valve further includes a rotor assembly 500 installed in the housing 400 and connected to the valve needle assembly 300, and the rotor assembly 500 rotates the valve needle assembly 300, thereby moving the valve needle assembly 300 axially within the nut 210.

[0063] One end of the valve stem 310 is fixedly connected to the rotor assembly 500, and the other end is inserted into the valve needle sleeve 321 and connected to the valve needle 322. Rotation of the rotor assembly 500 rotates the valve stem 310. Meanwhile, when the nut 210 is fixedly connected to the valve seat 110 because the valve stem 310 is threadedly engaged with the threaded segment 212, the valve stem 310 moves in the axial direction of the nut 210. Furthermore, the valve needle sleeve 321 moves axially along the inner wall of the fixed segment 213, so that the valve needle 322 moves toward or away from the valve disc seat 120 in the axial direction of the nut 210, thereby achieving the purpose of closing or opening the valve port 121.

[0064] In this embodiment, one end of the valve needle 322 is attached to the valve needle sleeve 321, and the other end is inserted into the valve port 121 of the valve body seat 120. The valve needle sleeve 321 is fitted and guided by the inner wall of the fixed segment 213, functioning as a guide and attachment to more stabilize the axial movement of the valve needle 322.

[0065] This application also proposes a cooling device, which includes an electronic expansion valve, the specific structure of which is described in the above embodiments. This cooling device incorporates all the technical solutions of the above embodiments, and therefore has at least all the technical effects of the technical solutions of the above embodiments, so further description is omitted here. Alternatively, the electrical appliance may be an air conditioner, a refrigerator, etc.

[0066] The above is merely a preferred embodiment of the present application, and does not limit the scope of the patent of the present application. Based on the inventive concept of the present application, any equivalent structural transformation made by utilizing the contents of the specification and accompanying drawings of the present application, or direct or indirect application to other related technical fields, are all within the protection scope of the present application. [Explanation of symbols]

[0067] [Table 1]

Claims

1. An electronic expansion valve, a valve seat having a valve disc seat and a valve chamber; a nut having an annular positioning portion projecting from an outer wall thereof for abutting against a chamber wall of the valve chamber to position the valve chamber, and one end of the nut being provided within the valve chamber; A valve stem; a valve needle portion connected to the valve stem; a connecting piece having one end fixedly connected to the nut and the other end extending away from the nut and fixedly connected to an axial end surface of the valve seat; Including, The nut is an attachment portion in which both the connection piece and the positioning portion are installed on an outer wall; a cylindrical extension portion having one end connected to the mounting portion and the other end extending in the axial direction toward the valve body seat, the valve needle portion is fitted to be guided by the inner wall of the extension portion; the extension portion is provided with a plurality of flow guide through holes that communicate the interior of the extension portion with the valve chamber; The plurality of flow guide through holes are provided at intervals around the periphery of the extension portion, the nut is configured to mount and guide the valve stem and the valve needle portion such that the valve stem and the valve needle portion are axially movable within the nut; The extension portion is disposed with a gap between it and the valve body seat, The length of the flow guide through hole in the axial direction is shorter than the length of the extension portion. Electronic expansion valve.

2. The electronic expansion valve according to claim 1 , wherein the positioning portion includes a cylindrical connecting segment that is interference-fitted to the inner wall of the valve seat.

3. the positioning portion further includes a guide segment provided on a side of the connection segment away from the connection piece and connected to the connection segment, The electronic expansion valve of claim 2 , wherein the outer diameter of the guide segment is smaller than the outer diameter of the connection segment.

4. 4. The electronic expansion valve of claim 3, wherein the outer diameter of the guide segment gradually decreases from the end connected to the connection segment to the end remote from the connection segment.

5. 5. The electronic expansion valve according to claim 1, wherein a balance passage is provided between the positioning portion and the valve seat, the balance passage connecting both sides of the positioning portion in the axial direction.

6. 6. The electronic expansion valve according to claim 5, wherein the connecting piece is provided with a balance hole that connects both ends of the connecting piece in the axial direction and communicates with the balance passage.

7. 7. The electronic expansion valve according to claim 6, wherein the connecting piece is spaced apart from the positioning part, the connecting piece, the positioning part and the valve seat together form a first chamber, and the balance passage and the balance hole both communicate with the first chamber.

8. the balance passage is provided in the positioning portion, The electronic expansion valve according to claim 5 , wherein the balance passage is provided in the valve seat.

9. 5. The electronic expansion valve according to claim 1, wherein the connecting piece is fixed to the valve seat by welding.

10. The nut is a thread segment mated with the valve stem; a fixed segment connected to the screw segment, extending toward the valve seat, and fitted with the valve needle portion to guide the valve needle portion; The electronic expansion valve according to claim 1 , wherein the connecting piece and the positioning portion are both provided on an outer wall of the fixed segment.

11. The fixed segment is The electronic expansion valve of claim 10 connected to the screw segment.

12. The electronic expansion valve according to claim 1 , wherein an outer wall of the extension portion and the positioning portion are arranged in a stepped manner, and an outer diameter of the extension portion is smaller than an outer diameter of the positioning portion.

13. The electronic expansion valve according to claim 1 , wherein the extension portion, the mounting portion, and the positioning portion are integrally formed.

14. A refrigeration device comprising the electronic expansion valve according to any one of claims 1 to 13.

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