Electronic expansion valve and refrigeration equipment
By separating the sliding nut seat and the connecting sleeve into a structural design, and combining it with insert injection molding technology, the problem of poor versatility of the electronic expansion valve needle has been solved, achieving versatility of the valve needle and reducing production costs, while improving connection stability and flow regulation effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG MEIZHI COMPRESSOR
- Filing Date
- 2025-05-23
- Publication Date
- 2026-04-28
AI Technical Summary
The differences in the specifications of the valve needle and valve port of existing electronic expansion valves result in poor component interchangeability and high production costs.
The structure employs separate sliding nut seats, connecting sleeves, and valve needle bodies. Different specifications of valve needle bodies are installed onto the sliding nut seats through the connecting sleeves, achieving universality for valve needles of different specifications. Insert injection molding technology is combined to improve connection stability and production efficiency.
It improves the versatility of the valve needle, reduces production costs, enhances connection stability and production efficiency, reduces wear and misalignment, and adapts to valve ports of different diameters to achieve flow regulation.
Smart Images
Figure CN224175387U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic expansion valve technology, and in particular to an electronic expansion valve and a refrigeration device. Background Technology
[0002] Electronic expansion valves are an important component in air conditioning refrigeration systems, primarily serving to throttle and reduce pressure, as well as regulate flow. The flow regulation of a typical electronic expansion valve is mainly determined by the flow adjustment surface of the valve needle and the valve orifice diameter. Therefore, products with different flow requirements need to be manufactured with valve needles and orifices of different specifications, resulting in poor component versatility and high production costs. Utility Model Content
[0003] The main purpose of this invention is to propose an electronic expansion valve and a refrigeration device, which aims to improve the versatility of the valve needle.
[0004] To achieve the above objectives, the present invention proposes an electronic expansion valve, which includes a valve core structure; the valve core structure includes:
[0005] A first valve needle, the first valve needle having a first valve port and a moving channel communicating with the first valve port; and
[0006] The second valve needle is movably disposed within the moving channel. The second valve needle includes a sliding nut seat, a connecting sleeve, and a valve needle body. The connecting sleeve insert is injection molded into the sliding nut seat. The valve needle body is connected to the connecting sleeve. The valve needle body is used to close or open the first valve port.
[0007] In one embodiment, the outer peripheral surface of the connecting sleeve is provided with a reinforcing portion, which is used to be embedded inside the sliding nut seat.
[0008] In one embodiment, the reinforcing part is configured as a forward spiral groove and a reverse spiral groove.
[0009] In one embodiment, the starting point of the forward spiral groove is 180° away from the starting point of the reverse spiral groove.
[0010] In one embodiment, the connecting sleeve includes an embedded section and a limiting section connected together. The reinforcing part is disposed on the outer peripheral surface of the embedded section. The outer diameter of the limiting section is larger than the outer diameter of the sliding nut seat. The limiting section is used to cooperate with the end sidewall of the moving channel for limiting.
[0011] In one embodiment, the connecting sleeve is provided with a slot, and the valve needle body is provided with a corresponding slot protrusion.
[0012] In one embodiment, a limiting groove is provided at one end of the connecting sleeve away from the sliding nut seat. The limiting groove is connected to the retaining groove. The width of the limiting groove is greater than the width of the retaining groove. A limiting protrusion is provided on the valve needle body corresponding to the limiting groove.
[0013] In one embodiment, the valve needle body and the connecting sleeve are welded together.
[0014] In one embodiment, the electronic expansion valve further includes a housing, the housing having a drive chamber and a second valve port, the drive chamber being used for mounting a drive device, the first valve needle being movably disposed between the drive chamber and the second valve port to open or close the second valve port, the first valve port being disposed on the end face of the first valve needle blocking the second valve port and communicating with the second valve port.
[0015] In one embodiment, a bearing seat is provided inside the housing, and the inner ring of the bearing seat is clearance-fitted with the sliding nut seat.
[0016] In one embodiment, the sliding nut seat has a flat portion, and the inner ring of the bearing seat has an adapter end face corresponding to the flat portion.
[0017] This utility model also proposes a refrigeration device, including the aforementioned electronic expansion valve.
[0018] The technical solution of this utility model divides the second valve needle into a sliding nut seat, a connecting sleeve, and a valve needle body. The valve needle body is installed onto the sliding nut seat using the connecting sleeve, allowing valve needle bodies of different specifications to be fixed onto the sliding nut seat. This means that only one type of sliding nut seat can be produced during the manufacturing process. Valve needle bodies of different sizes, adapted to the different sizes of the first valve ports, are installed onto the connecting sleeve. In other words, the connecting sleeve can accommodate valve core bodies of different specifications. This second valve needle not only utilizes the sliding nut seat to cooperate with the lead screw of the driving device to ensure normal driving of the second valve needle, but also utilizes the sliding nut seat to cooperate with the moving channel of the first valve needle to ensure smooth movement of the second valve needle. The valve needle body can also adapt to first valve ports of different diameters. Therefore, the second valve needle can be paired with second valve needles of different first valve ports to achieve different flow regulation effects. This second valve needle has high versatility, avoiding the need for different sized second valve cores for different sized first valve ports, thus helping to reduce production costs. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0020] Figure 1 A cross-sectional structural schematic diagram of an embodiment of the electronic expansion valve provided by this utility model;
[0021] Figure 2 for Figure 1 A cross-sectional structural diagram of the valve core structure of the provided electronic expansion valve;
[0022] Figure 3 for Figure 2 A schematic diagram of the second valve needle in the provided valve core structure;
[0023] Figure 4 for Figure 3 A cross-sectional view of the second valve needle is provided.
[0024] Figure 5 for Figure 3 A schematic diagram of the sliding nut seat and connecting pressure sleeve of the provided second valve needle;
[0025] Figure 6 for Figure 5 A cross-sectional view of the sliding nut seat and connecting pressure sleeve of the second valve needle is provided.
[0026] Figure 7 for Figure 3 A first-view structural schematic diagram of the valve needle body of the provided second valve needle;
[0027] Figure 8 for Figure 3 A structural schematic diagram of the valve needle body from a second perspective, provided for the second valve needle;
[0028] Figure 9 for Figure 3 A structural schematic diagram of the connecting sleeve of the second valve needle from a first-view perspective;
[0029] Figure 10 for Figure 3 A structural schematic diagram of the connecting sleeve of the second valve needle from a second perspective;
[0030] Figure 11 for Figure 3 A cross-sectional view of the connecting sleeve of the second valve needle is provided.
[0031] Figure 12 for Figure 1 A schematic diagram of the bearing housing of the provided electronic expansion valve;
[0032] Figure 13 for Figure 12 A cross-sectional structural diagram of the provided bearing housing.
[0033] Explanation of icon numbers:
[0034] 10. Electronic expansion valve; 100. Valve core structure; 110. First valve needle; 111. First valve port; 112. Moving channel; 120. Second valve needle; 121. Sliding nut seat; 121a. Flat position; 122. Connecting sleeve; 122a. Embedded section; 122b. Limiting section; 122c. Slot; 122d. Limiting groove; 123. Valve needle body; 123a. Slot protrusion; 123b. Limiting protrusion ring; 124. Reinforcing part; 124a. Forward spiral groove; 124b. Reverse spiral groove; 200. Housing; 210. Drive device; 211. Lead screw; 220. Second valve port; 230. Bearing seat; 231. Adaptor end face.
[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0039] Electronic expansion valves are an important component in air conditioning refrigeration systems, primarily serving to throttle and reduce pressure, as well as regulate flow. The flow regulation of a typical electronic expansion valve is mainly determined by the flow adjustment surface of the valve needle and the valve orifice diameter. Therefore, products with different flow requirements need to be manufactured with valve needles and orifices of different specifications, resulting in poor component versatility and high production costs.
[0040] To address the aforementioned problems, this utility model proposes an electronic expansion valve.
[0041] Please see Figure 1 , Figure 2 and Figure 4 In one embodiment of the present invention, the electronic expansion valve 10 includes a valve core structure 100; the valve core structure 100 includes a first valve needle 110 and a second valve needle 120, the first valve needle 110 is provided with a first valve port 111 and a moving channel 112 connected to the first valve port 111; the second valve needle 120 is movably disposed in the moving channel 112, the second valve needle 120 includes a sliding nut seat 121, a connecting sleeve 122 and a valve needle body 123, the connecting sleeve 122 is inserted into the sliding nut seat 121, the valve needle body 123 is connected to the connecting sleeve 122, and the valve needle body 123 is used to close or open the first valve port 111.
[0042] The technical solution of this utility model divides the second valve needle 120 into a sliding nut seat 121, a connecting sleeve 122, and a valve needle body 123. The connecting sleeve 122 is used to install the valve needle body 123 onto the sliding nut seat 121, allowing valve needle bodies 123 of different specifications to be fixed onto the sliding nut seat 121. This means that only one size of sliding nut seat 121 can be produced during manufacturing. Furthermore, valve needle bodies 123 matching the size of the first valve port 111 are installed onto the connecting sleeve 122 according to different first valve port 111 sizes. In other words, the connecting sleeve 122 can accommodate valve core bodies of different specifications. This second valve needle 120 not only... The sliding nut seat 121 cooperates with the lead screw 211 of the drive device 210 to ensure that the second valve needle 120 is driven normally by the drive device 210. The sliding nut seat 121 can also cooperate with the moving channel 112 of the first valve needle 110 to ensure the smooth movement of the second valve needle 120. The valve needle body 123 can also be adapted to first valve ports 111 of different diameters. Therefore, the second valve needle 120 can be matched with second valve needles 120 of first valve ports 111 of different diameters to achieve different flow regulation effects. Such a second valve needle 120 has high versatility and avoids the situation of setting different sized second valve cores for first valve ports 111 of different sizes, which helps to reduce production costs.
[0043] Secondly, the technical solution of this utility model involves injection molding the connecting sleeve 122 insert onto the sliding nut seat 121. Since the sliding nut seat 121 is an injection molded part, the weight of the second valve needle 120 can be significantly reduced. Moreover, using insert injection molding to form the sliding nut seat 121 can also reduce the processing difficulty of the sliding nut seat 121. Furthermore, insert injection molding allows direct bonding with the connecting sleeve 122 during the molding of the sliding nut seat 121, eliminating the need for separate molding of the connecting sleeve 122 and the sliding nut seat 121, followed by welding, riveting, and other processes, which improves production efficiency. The insert injection molding process can also eliminate fit tolerances in traditional assembly, improving the alignment accuracy between the second valve needle 120 and the first valve needle 110, and significantly reducing wear and misalignment after long-term use. More importantly, the connecting sleeve 122 and the sliding nut seat 121 are tightly bonded through injection molding, forming a molecular-level bond, which improves the connection stability of the connecting sleeve 122 and the sliding nut seat 121.
[0044] Reference Figure 6 , Figure 9 , Figure 10 and Figure 11Optionally, in this embodiment, the outer peripheral surface of the connecting sleeve 122 is provided with a reinforcing part 124, which is used to be embedded inside the sliding nut seat 121. It can be understood that the setting of the reinforcing part 124 can make the connecting sleeve 122 and the sliding nut seat 121 mechanically interlocked after the inserts of the connecting sleeve 122 and the sliding nut seat 121 are injection molded, thereby significantly reducing the risk of relative rotation between the connecting sleeve 122 and the sliding nut seat 121.
[0045] Furthermore, the reinforcing part 124 is configured as a forward spiral groove 124a and a reverse spiral groove 124b. Specifically, after the insert of the connecting sleeve 122 and the sliding nut seat 121 is injection molded, the inner cavity of the sliding nut seat 121 will generate corresponding reverse spiral protrusions and forward spiral protrusions corresponding to the forward spiral groove 124a and the reverse spiral groove 124b of the connecting sleeve 122. That is, the combination of the forward spiral groove 124a and the reverse spiral groove 124b can form a bidirectional engagement with the corresponding protrusions in the inner cavity of the sliding nut seat 121, so that a mechanical interlock is formed between the connecting sleeve 122 and the sliding nut seat 121, ensuring that the connecting sleeve 122 and the sliding nut will not rotate relative to each other. The connecting sleeve 122 and the sliding nut seat 121 have strong axial and radial bonding forces, thereby significantly reducing the risk of rotation. Furthermore, the difference in thermal expansion coefficients between the insert and the injection-molded part is significant. The periodic interlocking structure of the forward spiral groove 124a and the reverse spiral groove 124b can disperse stress concentration caused by temperature changes and reduce the probability of interface delamination. Of course, this solution is not limited to this. In the second embodiment, the reinforcing part 124 can also be configured as a protrusion. Specifically, after the insert connecting the pressure sleeve 122 and the sliding nut seat 121 is injection-molded, the inner cavity of the sliding nut seat 121 will generate a corresponding groove corresponding to the protrusion of the connecting pressure sleeve 122, thus forming a mechanical interlock between the connecting pressure sleeve 122 and the sliding nut seat 121. Of course, this solution is not limited to this. In the third embodiment, the reinforcing part 124 can also be configured as a groove. Similarly, after the insert connecting the pressure sleeve 122 and the sliding nut seat 121 is injection-molded, the inner cavity of the sliding nut seat 121 will generate a corresponding protrusion corresponding to the groove of the connecting pressure sleeve 122, thus forming a mechanical interlock between the connecting pressure sleeve 122 and the sliding nut seat 121.
[0046] In this embodiment, the starting point of the forward spiral groove 124a is 180° away from the starting point of the reverse spiral groove 124b; that is, the starting points of the forward spiral groove 124a and the reverse spiral groove 124b are 180° apart, which means that the forward spiral groove 124a and the reverse spiral groove 124b are completely symmetrically distributed on the circumference. When the injection high pressure is applied to the insert, the lateral force generated by the melt is synchronously canceled by the two sets of spiral grooves in opposite directions, thereby improving the anti-rotation capability of the connecting sleeve 122 and the sliding nut seat 121. Moreover, such forward spiral grooves 124a and reverse spiral grooves 124b are also easy to process. Of course, this solution is not limited to this. In the third embodiment, the forward spiral grooves 124a and the reverse spiral grooves 124b can also be alternately arranged.
[0047] It should be noted that, referring to Figure 9 The starting point of the forward spiral groove 124a is the intersection of the forward spiral groove 124a and the end face of the connecting sleeve 122 away from the valve needle body 123, denoted as A1. The starting point of the reverse spiral groove 124b is the intersection of the reverse spiral groove 124b and the end face of the connecting sleeve 122 away from the valve needle body 123, denoted as A2. The starting points of the forward spiral groove 124a and the reverse spiral groove 124b are 180° apart, which can also be understood as A1 and A2 being 180° apart.
[0048] Reference Figures 6 to 11 Optionally, the connecting sleeve 122 includes an embedded section 122a and a limiting section 122b connected together. The reinforcing part 124 is disposed on the outer peripheral surface of the embedded section 122a. The outer diameter of the limiting section 122b is larger than the outer diameter of the sliding nut seat 121. The limiting section 122b is used to cooperate with the end sidewall of the moving channel 112 for limiting. It can be understood that when the second valve needle 120 moves in the moving channel 112, the limiting section 122b can be used to cooperate with the moving channel 112. The end sidewall of the limiting segment 122b is engaged to limit the movement, thereby preventing the second valve needle 120 from separating from the first valve needle 110. Furthermore, after the limiting segment 122b contacts the end sidewall of the moving channel 112, if the second valve needle 120 continues to move away from the first valve port 111, the second valve needle 120 will drive the first valve needle 110 to move away from the second valve port 220 through the abutment engagement between the limiting segment 122b and the end sidewall of the moving channel 112, thereby opening the second valve port 220.
[0049] Secondly, since the outer diameter of the limiting section 122b is larger than the outer diameter of the sliding nut seat 121, when the valve needle body 123 closes the first valve port 111, the limiting section 122b can also restrict the axial displacement of the connecting sleeve 122, thereby preventing the connecting sleeve 122 from axially displacing relative to the sliding nut seat 121, that is, restricting the axial displacement of the valve needle body 123. The insert section 122a is used for injection molding with the sliding nut seat 121 insert; that is, the insert section 122a is embedded in the sliding nut seat 121. Since the outer diameter of the limiting section 122b is larger than the outer diameter of the sliding nut seat 121, the outer diameter of the limiting section 122b will also be larger than the outer diameter of the insert section 122a. Thus, when the insert section 122a is injection molded with the sliding nut seat 121 insert, the limiting section 122b can also act as a stop, preventing leakage of the injection molding liquid. Of course, this solution is not limited to this. In other embodiments, the connecting sleeve 122 may not have a limiting section 122b. The outer peripheral surface of the connecting sleeve 122 is embedded in the sliding nut seat 121, and the end face of the connecting sleeve 122 near the valve needle body 123 is exposed in the sliding nut seat 121 for the valve needle body 123 to be installed. At this time, the outer peripheral surface of the sliding nut seat 121 is provided with a limiting ring, which is used to cooperate with the end side wall of the moving channel 112 for limiting.
[0050] Optionally, the connecting sleeve 122 is provided with a slot 122c, and the valve needle body 123 is provided with a matching protrusion 123a corresponding to the slot 122c. It can be understood that during assembly, it is only necessary to insert the protrusion 123a on the valve needle body 123 into the slot 122c to complete the installation. This installation method is simple and can improve the assembly efficiency of the valve needle body 123.
[0051] Furthermore, the end of the connecting sleeve 122 away from the sliding nut seat 121 is provided with a limiting groove 122d, which is connected to the retaining groove 122c. The width of the limiting groove 122d is greater than the width of the retaining groove 122c. The valve needle body 123 is provided with a limiting protrusion 123b corresponding to the limiting groove 122d. In this way, the limiting protrusion 123b can restrict the axial displacement of the valve needle body 123 when the valve needle body 123 closes the first valve port 111 by utilizing the cooperation of the limiting protrusion 123b and the limiting groove 122d, thereby preventing the valve needle body 123 from axially displacing relative to the connecting sleeve 122. Of course, this solution is not limited to this. In other embodiments, a limiting wall can also be provided at the bottom of the slot 122c, that is, a limiting wall can be provided on the end side of the slot 122c away from the valve needle body 123. The limiting wall abuts against the free end of the protrusion 123a, thereby limiting the axial displacement of the valve needle body 123.
[0052] Optionally, in this embodiment, the connecting sleeve 122 is a metal part, which can improve the strength of the second valve needle 120. Of course, this solution is not limited to this. In other embodiments, the connecting sleeve 122 can also be glass or other engineering plastics with high heat resistance and high strength, such as nylon.
[0053] Optionally, the valve needle body 123 and the connecting sleeve 122 are welded together. It can be understood that welding forms a metallurgical bond by melting the substrate, and the joint strength is close to or equal to the strength of the base material. Moreover, compared with bolt connection, welding has no risk of thread wear or vibration loosening. Therefore, using welding to connect the valve needle body 123 and the connecting sleeve 122 is beneficial to increasing the connection strength between the valve needle body 123 and the connecting sleeve 122.
[0054] Furthermore, in this embodiment, the valve core body is first snapped onto the connecting sleeve 122, and then the valve core body and the connecting sleeve 122 are reinforced by welding. That is, there is a dual fixing method between the valve core body and the connecting sleeve 122.
[0055] Reference Figure 1 , Figure 3 , Figure 5 , Figure 12 and Figure 13 The electronic expansion valve 10 proposed in this solution is a dual-valve electronic expansion valve 10. The first valve needle 110 is a large valve needle, and the second valve needle 120 is a small valve needle. It can be understood that the large valve needle is the main valve, with a longer stroke, and is responsible for wide-range flow regulation. The small valve needle is the auxiliary valve, with a shorter stroke, and is responsible for fine regulation of flow within a small range. The large valve needle and the small valve needle work in coordination to achieve high-precision flow regulation.
[0056] Furthermore, in this embodiment, the electronic expansion valve 10 further includes a housing 200, which has a drive chamber and a second valve port 220. The drive chamber is used for mounting the drive device 210. The first valve needle 110 is movably disposed between the drive chamber and the second valve port 220 to open or close the second valve port 220. The first valve port 111 is disposed on the end face of the first valve needle 110 that blocks the second valve port 220 and communicates with the second valve port 220. Specifically, the drive device 210 is drivenly connected to the second valve needle 120 to drive the second valve needle 120 to move in the moving channel 112 along the axial direction to open or close the first valve port 111 and drive the first valve needle 110 to open or close the second valve port 220.
[0057] In this embodiment, the driving device 210 includes a driving member and a lead screw 211 that is driven and connected to the driving member. The sliding nut seat 121 of the second valve needle 120 is movably disposed on the lead screw 211.
[0058] Optionally, the housing 200 is provided with a bearing seat 230, the inner ring of the bearing seat 230 is in clearance fit with the sliding nut seat 121. The bearing seat 230 allows the sliding nut seat 121 to move axially up and down relative to the bearing seat 230, thereby improving the smoothness of the movement of the second valve needle 120.
[0059] Furthermore, the fit clearance is between 0.05mm and 0.10mm, which can prevent the second valve needle 120 from shaking without affecting its movement.
[0060] Furthermore, the sliding nut seat 121 is provided with a flat part 121a, and the inner ring of the bearing seat 230 is provided with an adapter end face 231 corresponding to the flat part 121a, so as to prevent the second valve needle 120 from rotating relative to the bearing seat 230.
[0061] This utility model also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0062] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. An electronic expansion valve, characterized in that, The electronic expansion valve includes a valve core structure; the valve core structure includes: A first valve needle, the first valve needle having a first valve port and a moving channel communicating with the first valve port; and The second valve needle is movably disposed within the moving channel. The second valve needle includes a sliding nut seat, a connecting sleeve, and a valve needle body. The connecting sleeve insert is injection molded into the sliding nut seat. The valve needle body is connected to the connecting sleeve. The valve needle body is used to close or open the first valve port.
2. The electronic expansion valve as described in claim 1, characterized in that, The outer circumferential surface of the connecting sleeve is provided with a reinforcing part, which is used to be embedded inside the sliding nut seat.
3. The electronic expansion valve as described in claim 2, characterized in that, The reinforcing part is configured with a forward spiral groove and a reverse spiral groove.
4. The electronic expansion valve as described in claim 3, characterized in that, The starting point of the forward spiral groove is 180° away from the starting point of the reverse spiral groove.
5. The electronic expansion valve as described in claim 2, characterized in that, The connecting sleeve includes an embedded section and a limiting section connected together. The reinforcing part is provided on the outer peripheral surface of the embedded section. The outer diameter of the limiting section is larger than the outer diameter of the sliding nut seat. The limiting section is used to cooperate with the end sidewall of the moving channel for limiting.
6. The electronic expansion valve as described in claim 1, characterized in that, The connecting sleeve is provided with a slot, and the valve needle body is provided with a corresponding slot protrusion.
7. The electronic expansion valve as described in claim 6, characterized in that, The end of the connecting sleeve away from the sliding nut seat is provided with a limiting groove, the limiting groove is connected to the slot, the width of the limiting groove is greater than the width of the slot, and the valve needle body is provided with a limiting protrusion ring corresponding to the limiting groove.
8. The electronic expansion valve as described in claim 6, characterized in that, The valve needle body and the connecting pressure sleeve are welded and fixed.
9. The electronic expansion valve according to any one of claims 1 to 8, characterized in that, The electronic expansion valve also includes a housing, which has a drive chamber and a second valve port. The drive chamber is used for mounting a drive device. The first valve needle is movably disposed between the drive chamber and the second valve port to open or close the second valve port. The first valve port is disposed on the end face of the first valve needle that blocks the second valve port and communicates with the second valve port.
10. The electronic expansion valve as described in claim 9, characterized in that, The housing is provided with a bearing seat, and the inner ring of the bearing seat is clearance-fitted with the sliding nut seat.
11. The electronic expansion valve as described in claim 10, characterized in that, The sliding nut seat has a flat section, and the inner ring of the bearing seat has an adapter end face corresponding to the flat section.
12. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 11.