Electronic expansion valves and refrigeration equipment

Abstract

This utility model discloses an electronic expansion valve and a refrigeration device, relating to the field of fluid control component technology. The electronic expansion valve includes a valve body and a valve needle assembly. The valve body includes a nut seat and a valve port seat, which are connected and enclose a valve cavity. The valve port seat has a valve port and a flow hole communicating with the valve cavity. The valve needle assembly includes a lead screw and a valve head, which are rotatably connected by a bearing and fixed axially. The lead screw is screwed to the nut seat to drive the valve head to slide within the valve cavity. The valve head is used to open or close the valve port. One of the valve head and the valve cavity has a limiting groove, and the other has a limiting protrusion. The limiting groove extends along the sliding direction of the valve head, and the limiting protrusion and the limiting groove slide in the extending direction of the limiting groove. The technical solution provided by this utility model aims to reduce the risk of wear on the valve needle assembly and valve port, avoiding internal leakage of the electronic expansion valve or jamming of the valve needle assembly.

Description

Technical Field

[0001] This utility model relates to the field of fluid control components technology, and in particular to an electronic expansion valve and a refrigeration device. Background Technology

[0002] In refrigeration equipment, electronic expansion valves are usually installed in the system piping to facilitate the control of refrigerant flow. In related technologies, the valve needle assembly of the electronic expansion valve is prone to wear after the valve port is opened or closed repeatedly, which can lead to internal leakage of the electronic expansion valve or even jamming of the valve needle assembly. Utility Model Content

[0003] The main purpose of this invention is to provide an electronic expansion valve and a refrigeration device, which aims to reduce the risk of wear on the valve needle assembly and valve port, and avoid situations such as internal leakage of the electronic expansion valve or jamming of the valve needle assembly.

[0004] To achieve the above objectives, the electronic expansion valve proposed in this utility model includes:

[0005] The valve body (100) includes a nut seat (110) and a valve port seat (120). The nut seat (110) and the valve port seat (120) are connected to enclose a valve cavity (101). The valve port seat (120) is provided with a valve port (121) and a flow hole (122) communicating with the valve cavity (101).

[0006] A valve needle assembly (200) includes a lead screw (220) and a valve head (210). The lead screw (220) and the valve head (210) are rotatably connected by a bearing (230) and fixed in the axial direction. The lead screw (220) is screwed to the nut seat (110) to drive the valve head (210) to slide in the valve cavity (101). The valve head (210) is used to open or close the valve port (121).

[0007] The valve head (210) and the valve cavity (101) are provided with a limiting groove (123) and a limiting protrusion (211). The limiting groove (123) extends along the sliding direction of the valve head (210), and the limiting protrusion (211) and the limiting groove (123) slide together in the extending direction of the limiting groove (123).

[0008] In one embodiment, the limiting groove (123) and the limiting protrusion (211) have a gap in the radial direction of the valve needle assembly (200).

[0009] In one embodiment, the gap between the limiting groove (123) and the limiting protrusion (211) in the radial direction of the valve needle assembly (200) is H, satisfying: 0.05mm≤H≤0.15mm.

[0010] In one embodiment, the limiting protrusion (211) has two limiting walls (212) distributed opposite to each other in the circumference of the valve needle assembly (200), the limiting walls (212) being arranged radially parallel to the valve needle assembly (200), and the limiting groove (123) slidingly abutting against the two groove sidewalls opposite to each other in the circumference of the valve needle assembly (200) and the two limiting walls (212) one-to-one.

[0011] In one embodiment, the gap between the limiting wall (212) and the groove sidewall of the limiting groove (123) is S, which satisfies: 0.01mm≤S≤0.05mm.

[0012] In one embodiment, the limiting groove (123) is disposed on the cavity wall of the valve cavity (101), and the limiting protrusion (211) is disposed on the valve head (210).

[0013] In one embodiment, the valve body (100) is provided with a stop surface (111) at one end of the limiting groove (123) away from the valve port (121). When the valve head (210) opens the valve port (121) to the limit position, the stop surface (111) and the limiting protrusion (211) abut against each other along the sliding direction of the valve needle assembly (200).

[0014] In one embodiment, the limiting groove (123) is disposed on the valve seat (120) and extends through the end of the valve seat (120) away from the valve port (121), and the stop surface (111) is disposed on the side of the nut seat (110) opposite to the limiting groove (123) along the axial direction of the valve needle assembly (200).

[0015] In one embodiment, the width of the limiting groove (123) is smaller than the diameter of the flow hole (122).

[0016] In one embodiment, the limiting groove (123) is located on the side of the flow hole (122) away from the valve port (121), and the limiting groove (123) is connected through the flow hole (122).

[0017] In one embodiment, when the valve head (210) closes the valve port (121), the limiting protrusion (211) is located in the limiting groove (123) and is not exposed in the flow hole (122).

[0018] In one embodiment, the electronic expansion valve includes at least two of the limiting protrusions (211) and at least two of the limiting grooves (123), with the two limiting protrusions (211) or the two limiting grooves (123) evenly spaced along the circumference of the valve needle assembly (200).

[0019] In one embodiment, the nut seat (110) is made of polyphenylene sulfide material and glass fiber or carbon fiber with a content of 10% to 30%.

[0020] This utility model also proposes a refrigeration device, which includes the aforementioned electronic expansion valve.

[0021] The technical solution of this utility model involves providing a limiting groove in one valve cavity and a limiting protrusion in the other. As the valve head slides within the valve cavity to open or close the valve port, the limiting protrusion simultaneously slides within the limiting groove. The limiting groove effectively limits and fixes the limiting protrusion circumferentially within the valve needle assembly, guiding the valve head to slide stably along its axial direction, thus restricting the valve head's circumferential rotational freedom. Consequently, after long-term use, the contact surfaces between the valve head and the valve port can accurately align and abut, reducing wear caused by misalignment and lowering the risk of internal leakage. This ensures the sealing performance of the valve head when closing the valve port. Furthermore, the relative deformation between the valve head and the valve port is minimal, allowing the valve head to open and close smoothly, reducing the probability of jamming after closure and ensuring the operational stability of the electronic expansion valve. Attached Figure Description

[0022] 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.

[0023] Figure 1 A cross-sectional view of an embodiment of the electronic expansion valve provided by this utility model;

[0024] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure of the middle valve seat;

[0026] Figure 4 for Figure 3 Top view of the valve seat;

[0027] Figure 5 for Figure 3 Cross-sectional view of the valve seat;

[0028] Figure 6 for Figure 1 Schematic diagram of the structure of the middle valve head;

[0029] Figure 7 for Figure 6 Top view of the valve head;

[0030] Figure 8 for Figure 6 Cross-sectional view of the valve head;

[0031] Figure 9 for Figure 1 A top view showing the corresponding limiting protrusion and limiting groove of the valve head and valve seat;

[0032] Figure 10 This is a cross-sectional view of an electronic expansion valve in the prior art.

[0033] Explanation of icon numbers:

[0034] 100. Valve body; 101. Valve cavity; 110. Nut seat; 111. Stop surface; 120. Valve port seat; 121. Valve port; 122. Flow hole; 123. Limit groove;

[0035] 200, Valve needle assembly; 210, Valve head; 211, Limiting protrusion; 212, Limiting wall; 220, Lead screw; 230, Bearing; 301, Limiting rod; 302, Slip ring rail.

[0036] 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

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In existing technologies, such as Figure 10 As shown, the electronic expansion valve typically uses a rotor to drive the lead screw 220 to rotate, and then uses a nut seat 110 to drive the lead screw 220 to move axially. The lead screw 220 is circumferentially connected to the valve head 210 through the bearing 230 and is fixedly fitted in the axial direction, thereby pushing the valve head 210 to open or close the valve port 121. Then, the rotational connection between the lead screw 220 and the valve head 210 inevitably causes the valve head 210 to produce a certain degree of circumferential movement, resulting in circumferential misalignment between the valve head 210 and the valve port 121. After the valve head 210 of the valve needle assembly 200 opens or closes the valve port 121 multiple times, the circumferential misalignment between the valve head 210 and the valve port 121 causes wear on the contact surface between the valve head 210 and the valve port 121, thereby reducing the sealing performance of the valve head 210 when closing the valve port 121, causing internal leakage of the electronic expansion valve, reducing the energy efficiency of the refrigeration equipment, and even causing the valve head 210 to jam after closing the valve port 121 due to wear and deformation, thus affecting the operation of the electronic expansion valve.

[0041] This utility model proposes an electronic expansion valve.

[0042] Please refer to Figures 1 to 3 , Figure 6 In one embodiment of this utility model, the electronic expansion valve includes:

[0043] The valve body 100 includes a nut seat 110 and a valve port seat 120. The nut seat 110 and the valve port seat 120 are connected and enclose a valve cavity 101. The valve port seat 120 is provided with a valve port 121 and a flow hole 122 that communicate with the valve cavity 101.

[0044] The valve needle assembly 200 includes a lead screw 220 and a valve head 210. The lead screw 220 and the valve head 210 are rotatably connected by a bearing 230 and fixed in the axial direction. The lead screw 220 is screwed to a nut seat 110 to drive the valve head 210 to slide in the valve cavity 101. The valve head 210 is used to open or close the valve port 121.

[0045] The valve head 210 and the valve cavity 101 are provided with a limiting groove 123 and a limiting protrusion 211. The limiting groove 123 extends along the sliding direction of the valve head 210, and the limiting protrusion 211 and the limiting groove 123 slide together in the extending direction of the limiting groove 123.

[0046] The technical solution of this utility model is to provide a limiting groove 123 in one of the valve cavity 101 and the valve head 210, and a limiting protrusion 211 in the other. During the process of the valve head 210 sliding in the valve cavity 101 to open or close the valve port 121, the limiting protrusion 211 also slides synchronously in the limiting groove 123. The limiting groove 123 is used to limit and fix the limiting protrusion 211 in the circumferential direction of the valve needle assembly 200, thereby guiding the valve head 210 to slide stably along its axial direction and restricting the degree of freedom of the valve head 210 to rotate around the circumference. Thus, after long-term use of the electronic expansion valve, the contact surfaces between the valve head 210 and the valve port 121 can accurately align and abut, reducing wear caused by misalignment between the valve head 210 and the valve port 121, reducing the risk of internal leakage in the electronic expansion valve, thereby ensuring the sealing performance of the valve head 210 when closing the valve port 121. At the same time, the relative deformation between the valve head 210 and the valve port 121 is small, allowing the valve head 210 to smoothly open or close the valve port 121, reducing the probability of the valve head 210 getting stuck after closing the valve port 121, thereby ensuring the operational stability of the electronic expansion valve.

[0047] It should be noted that the lead screw 220 of the valve needle assembly 200 rotates relative to the nut seat 110. Guided by a thread, the lead screw 220 moves axially, thereby causing the valve head 210 to slide axially within the valve cavity 101, opening or closing the valve port 121. The lead screw 220 and the valve head 210 rotate relative to each other via bearings, and the valve head 210 inevitably tends to rotate with the lead screw 220. Here, a limiting protrusion 211 or a limiting groove 123 is provided on the valve head 210 to ensure that the contact surfaces of the valve needle assembly 200 and the valve port 121 are constantly and accurately aligned, reducing the possibility of wear caused by circumferential misalignment between the valve head 210 and the valve port 121. It can be understood that the axial, circumferential, and radial directions of the valve needle assembly 200 are equivalent to the axial, circumferential, and radial directions of the electronic expansion valve, and the axial, circumferential, and radial directions of this technical solution are all described above and will not be repeated here.

[0048] Without loss of generality, in one embodiment, please refer to Figure 3 and Figure 6The limiting protrusion 211 has at least two limiting walls 212 distributed opposite each other in the circumferential direction of the valve needle assembly 200, and the limiting groove 123 slides against the two opposite groove sidewalls and the two limiting walls 212 one-to-one in the circumferential direction. The limiting walls 212 are arranged parallel to the radial direction of the valve needle assembly 200. It can be understood that the limiting walls 212 of the limiting protrusion 211 can be inclined to a certain extent relative to the radial direction of the valve needle assembly 200 to form an acute angle, or be arranged parallel to the radial direction, presenting a projection surface at least in the circumferential direction of the valve needle assembly 200, and can limit the valve needle assembly 200 in the circumferential direction. Therefore, the specific shape of the limiting protrusion 211 and the limiting groove 123 is not limited. For example, on the cross section of the valve needle assembly 200 parallel to the radial and circumferential directions, the limiting groove 123 and the limiting protrusion 211 are adapted to each other, and the shape of the limiting groove 123 or the limiting protrusion 211 can be triangular, trapezoidal, circular, rectangular, etc. Thus, the limiting protrusion 211 and the limiting groove 123 can slide and abut against each other in any circumferential direction of the valve needle assembly 200, thereby ensuring the circumferential stability of the valve needle assembly 200 and the valve cavity 101. In addition, the dimension of the limiting groove 123 extending axially along the valve needle assembly 200 is greater than or equal to the axial sliding stroke of the valve head 210, and at least does not interfere with the valve head 210 sliding to the extreme position of opening or closing the valve port 121, but can be adapted to the two extreme positions in the sliding stroke of the valve needle assembly 200.

[0049] In one embodiment, please refer to Figure 1 and Figure 2 The limiting groove 123 and the limiting protrusion 211 have a gap in the radial direction of the valve needle assembly 200. It can be understood that the limiting groove 123 and the limiting protrusion 211 are circumferentially matched in a limiting fit with the valve needle assembly 200, but do not directly contact each other in the radial direction. On the one hand, this reduces the frictional resistance and wear between the limiting groove 123 and the limiting protrusion 211, ensuring the stability and smoothness of the sliding of the valve needle assembly 200. On the other hand, it allows for the space required between the limiting groove 123 and the limiting protrusion 211 due to processes, thermal expansion and contraction, etc., avoiding jamming caused by excessive constraint and reducing assembly difficulty. The portion of the valve needle assembly 200 that abuts against the valve cavity 101 is filled with lubricant, and the gap between the limiting groove 123 and the limiting protrusion 211 allows the lubricant to penetrate, thereby reducing the relative sliding friction between the limiting protrusion 211 and the limiting groove 123. Without loss of generality, the circumferentially opposite sidewalls or radially opposite sidewalls of the limiting protrusion 211 and the limiting groove 123 may be provided with small grooves to allow lubricant to penetrate and reduce frictional resistance and frictional loss.

[0050] Furthermore, in this embodiment, please refer to Figure 1 , Figure 2 and Figure 9The radial clearance H between the limiting groove 123 and the limiting protrusion 211 in the valve needle assembly 200 satisfies: 0.05mm ≤ H ≤ 0.15mm. The size of H ensures that the limiting protrusion 211 has a certain radial clearance space within the limiting groove 123, reducing the risk of the valve needle assembly 200 jamming or excessive friction due to an excessively small clearance, and also preventing guide failure between the limiting groove 123 and the limiting protrusion 211 due to an excessively large clearance. The value of H is determined by the minimum clearance between the opposing sidewalls of the limiting groove 123 and the limiting protrusion 211 in the radial direction of the valve needle assembly 200, which can be 0.05mm, 0.07mm, 0.1mm, 0.13mm, or 0.15mm, etc. Of course, in other embodiments, H can also be between 0.16mm and 0.3mm, depending on the different specifications of the electronic expansion valve.

[0051] In one embodiment, please refer to Figure 9 The gap S between the limiting wall 212 and the groove sidewall of the limiting groove 123 satisfies: 0.01mm ≤ S ≤ 0.05mm. It can be understood that the limiting protrusion 211 and the limiting groove 123 exhibit axial upward sliding and circumferential upper limiting. Therefore, the distance between the corresponding groove sidewalls of the limiting wall 212 and the limiting groove 123 should be as small as possible and should not interfere with the sliding of the valve head 210. Thus, S is limited to between 0.01mm and 0.05mm to reduce the risk of the valve head 210 jamming or excessive friction during sliding, and also to prevent axial guiding and circumferential limiting failure between the limiting groove 123 and the limiting protrusion 211. The value of S can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, or 0.05mm, etc.

[0052] In one embodiment, please refer to Figure 2 , Figure 3 and Figure 6The limiting groove 123 is disposed on the cavity wall of the valve chamber 101, and the limiting protrusion 211 is disposed on the valve head 210. It can be understood that, relative to the valve chamber 101, the valve head 210 slides. In the sliding direction of the valve needle assembly 200, the size of the limiting protrusion 211 is smaller than the size of the limiting groove 123. By disposing the limiting protrusion 211 on the outer periphery of the valve needle assembly 200, the limiting protrusion 211 and the valve needle assembly 200 move synchronously. Furthermore, the space required for the limiting protrusion 211 to slide is less than the space required for the limiting groove 123 to slide synchronously with the valve head 210, thereby reducing the impact of the cooperation between the limiting protrusion 211 and the limiting groove 123 on the sliding of the valve needle assembly 200. For the assembly of the valve needle assembly 200, the limiting groove 123 is disposed on the cavity wall of the valve cavity 101, the limiting protrusion 211 on the valve head 210 is aligned with the limiting groove 123, and then slid into the limiting groove 123, simplifying the installation operation of the valve needle assembly 200. Furthermore, when the valve head 210 closes the valve port 121, there is an interaction force between the valve head 210 and the valve port 121, and the end of the valve needle away from the valve port 121 is also subjected to the traction force of the rotor. Therefore, disposing of the limiting protrusion 211 on the valve head 210 avoids weakening the structural strength of the valve head 210, thereby ensuring the stability and durability of the valve head 210 when opening or closing the valve port 121. Of course, in other embodiments, the limiting protrusion 211 can also be disposed on the cavity wall of the valve cavity 101, and the limiting groove 123 can be disposed on the outer periphery of the valve head 210.

[0053] Furthermore, in this embodiment, please refer to Figure 2 The valve body 100 has a stop surface 111 at the end of the limiting groove 123 away from the valve port 121. When the valve head 210 opens the valve port 121 to its limit position, the stop surface 111 and the limiting protrusion 211 abut against each other along the sliding direction of the valve needle assembly 200. It should be noted that in the prior art, such as... Figure 10As shown, a slip ring rail 302 is provided on the nut seat 110 of the valve body 100, and a limiting rod 301 is provided on the rotor. The positions of the two ends of the sliding stroke of the valve needle assembly 200 are determined by the stop cooperation between the limiting rod 301 and the slip ring rail 302. However, in the prior art, the stop cooperation between the slip ring rail 302 and the limiting rod 301, and the circumferential sliding of the slip ring rail 302 will generate obvious mechanical noise, and they need to be set separately, which increases the complexity and cost of the process. In this embodiment, the abutting cooperation between the limiting protrusion 211 and the stop surface 111 forms the maximum opening degree of the valve needle assembly 200 opening the valve port 121. In this way, the electronic expansion valve of this embodiment integrates the limiting of the sliding of the valve needle assembly 200 on the limiting protrusion 211, which eliminates the need to set the slip ring rail 302 and the limiting rod 301 separately, reduces the noise of mechanical collision, and reduces the number of components, thereby reducing the difficulty and cost of the process. Furthermore, the opening degree of the valve head 210 to open the valve port 121 depends on the sliding formation of the limiting protrusion 211, so that the valve needle assembly 200 can be circumferentially limited by the limiting protrusion 211 and the limiting groove 123 at any position of axial sliding, ensuring the accuracy and stability of the valve needle assembly 200 sliding axially. The stop surface 111 is located at the end of the limiting groove 123 away from the valve port 121. It can be a component formed outside the limiting groove 123, or it can be configured as the sidewall of the groove at that end of the limiting groove 123. Here, the axial abutment surfaces of the stop surface 111 and the limiting protrusion 211 can be flat, curved, or have a plug-in fit, simply to form a stop on the limiting protrusion 211 axially. Of course, in other embodiments, the limiting protrusion 211 can also be provided on the valve body 100, the limiting groove 123 can be provided on the valve head 210, and the end of the limiting groove 123 near the valve port 121 can be provided with a groove sidewall, or other components that move with the valve needle assembly 200 to form a stop wall. When the groove sidewall or the stop wall abuts against the limiting protrusion 211, the valve head 210 opens the valve port 121 to the limit position. Correspondingly, the end of the limiting groove 123 away from the valve port 121 can also be provided with a groove sidewall, or other components that move with the valve needle assembly 200 to form a stop wall. When the groove sidewall or the stop wall abuts against the limiting protrusion 211, the valve head 210 closes the valve port 121 to the limit position.

[0054] Regarding the forming position of the stop surface 111, in one embodiment, please refer to... Figures 2 to 5A limiting groove 123 is disposed on the valve seat 120 and extends through the end of the valve seat 120 away from the valve port 121. A stop surface 111 is disposed on the side of the nut seat 110 opposite to the limiting groove 123 along the axial direction of the valve needle assembly 200. The valve body 100 is divided into a nut seat 110 and a valve seat 120, and the nut seat 110 and the valve seat 120 are connected to form a valve cavity 101. This facilitates the machining and forming of the internal structure of the valve cavity 101 and also facilitates the sliding of the valve head 210 in the valve cavity 101. The limiting groove 123 extends through the end of the valve seat 120 away from the valve port 121. This end is close to the nut seat 110 and is located at the connection between the valve seat 120 and the nut seat 110. When installing the valve needle assembly 200, the limiting protrusion 211 on the valve head 210 can be slidably inserted into the limiting groove 123, thereby improving the installation convenience of the valve needle assembly 200. Thus, by configuring the nut seat 110 and the limiting groove 123 on opposite sides along the axial direction of the valve needle assembly 200, a stop surface 111 is provided. On the one hand, when the limiting protrusion 211 and the stop surface 111 abut, the limiting protrusion 211 remains sliding within the limiting groove 123. On the other hand, utilizing the existing side surface to provide the stop surface 111 simplifies the molding design of the stop surface 111, thereby reducing the complexity of the electronic expansion valve. Of course, in other embodiments, the end of the limiting groove 123 away from the valve port 121 does not penetrate the valve port seat 120, and the stop surface 111 can also be configured as the groove sidewall of the limiting groove 123 away from the valve port 121.

[0055] Regarding the material of the nut seat 110, in this embodiment, please refer to... Figure 1 and Figure 2The nut seat 110 is made of polyphenylene sulfide and contains 10% to 30% glass fiber or carbon fiber. It is understood that the nut seat 110 maintains a stable position within the electronic expansion valve, and the stop surface 111, positioned on the nut seat 110, effectively stops the sliding limiting protrusion 211. Thus, the material of the nut seat 110 is limited to polyphenylene sulfide and glass fiber or carbon fiber with a content of 10% to 30%. Polyphenylene sulfide is used to reduce the wear of the nut seat 110 and improve its durability by utilizing its high temperature resistance, chemical stability and low coefficient of friction. The addition of 10% to 30% glass fiber or carbon fiber to the nut seat 110, which is understood as a weight ratio, improves the tensile strength, bending strength and impact resistance of the nut seat 110, so that the nut seat 110 can withstand higher internal pressure and external stress, thereby ensuring the stability of the stop contact between the valve needle assembly 200 and the stop surface 111 on the nut seat 110. In addition, the valve head 210 and the lead screw 220 are circumferentially connected by the bearing 230 and axially fixed by the bearing 230 sleeve. The limiting protrusion 211 is provided on the valve head 210. When the valve head 210 opens and closes the valve port 121, the sliding contact between the limiting protrusion 211 and the limiting groove 123 can stably limit the circumferential misalignment of the valve head 210 and reduce the wear of the valve head 210 and the valve port 121.

[0056] In one embodiment, please refer to Figures 6 to 8 The limiting groove 123 is located on the side of the flow hole 122 away from the valve port 121, and extends between the stop surface 111 and the flow hole 122. It should be noted that the space between the valve head 210 and the valve port 121 in the valve cavity 101 allows refrigerant to flow through the flow hole 122. A limiting protrusion 211 is provided on the valve head 210, which limits the limiting groove 123 to the side of the flow hole 122 away from the valve port 121. This prevents the limiting protrusion 211 on the valve head 210 from slidingly connecting to the limiting groove 123 in the space between the valve head 210 and the valve port 121, thereby reducing the impact of the sliding fit between the limiting protrusion 211 and the limiting groove 123 on the flow of the refrigerant. At the same time, this also avoids interference between the positions of the limiting groove 123 and the flow hole 122, thereby reducing the difficulty of setting the limiting groove 123 and preventing the limiting groove 123 and the flow hole 122 from being located at the same position on the valve head 210, thus ensuring the structural strength of the valve head 210. Of course, in other embodiments, the limiting groove 123 can also be set at or adjacent to the position where the flow hole 122 is set on the valve head 210.

[0057] In one embodiment, please refer to Figures 3 to 5The width of the limiting groove 123 is smaller than the diameter of the flow hole 122. It can be understood that the limiting groove 123 is recessed into the side wall of the valve cavity 101. The width of the limiting groove 123 is understood as the distance between the two side walls of the limiting groove 123 in the circumferential direction. The smaller width of the limiting groove 123 reduces the impact of the limiting groove 123 on the strength of the flow hole 122, and also ensures the reliability of the circumferential limiting fit between the limiting protrusion 211 and the limiting groove 123. Furthermore, for the opposite sides of the limiting groove 123 and the limiting protrusion 211 in the radial direction of the valve needle assembly 200, a raised strip can be provided on one side and a strip-shaped groove on the other side, forming a two-stage circumferential limiting structure of the limiting groove 123 and the limiting protrusion 211, and the raised strip and the strip-shaped groove, ensuring the reliability of limiting the circumferential rotation of the valve head 210. Of course, in other embodiments, depending on the size of the flow hole 122, the width of the limiting groove 123 may be equal to or slightly larger than the diameter of the flow hole 122.

[0058] Furthermore, in this embodiment, please refer to Figure 2 and Figure 5 The limiting groove 123 extends through and connects to the flow hole 122. It can be understood that during the installation of the valve needle assembly 200, the limiting protrusion 211 on the valve needle assembly 200 can slide along the flow hole 122 into the limiting groove 123, reducing the assembly difficulty of the valve needle assembly 200. Simultaneously, when the refrigerant flows through the flow hole 122, it can also partially seep into the limiting groove 123 area, utilizing the high pressure and cooling characteristics of the refrigerant at this location to reduce sliding wear between the limiting protrusion 211 and the limiting groove 123. Furthermore, the connection between the limiting groove 123 and the flow hole 122 helps to connect the spaces at both axial ends of the valve head 210, maintaining pressure balance within the valve cavity 101, especially pressure balance at both axial ends of the valve head 210. This reduces the resistance during the sliding process of the valve needle assembly 200 and also promotes the discharge of refrigerant from the valve port 121, reducing the risk of refrigerant flow dead zones. Furthermore, by having the limiting groove 123 penetrate the flow hole 122, the difficulty of machining the limiting groove 123 in the valve head 210 is reduced. Similarly, the aforementioned provision that the limiting groove 123 penetrates the end of the valve head 210 away from the valve port 121 also reduces the difficulty of machining the limiting groove 123 in the valve head 210. Of course, in other embodiments, the limiting groove 123 may not penetrate the flow hole 122 at the end facing the flow hole 122, so that the end of the limiting groove 123 near the valve port 121 forms a groove wall, reducing the risk of refrigerant seeping into the side of the valve head 210 away from the valve port 121. Furthermore, the groove wall can also be used to limit the limiting protrusion 211, thereby reducing the probability of the valve head 210 over-inserting and sealing the valve port 121, thus avoiding damage to the valve head 210 or the valve port 121, or the valve head 210 getting stuck in the valve port 121.

[0059] Specifically, in this embodiment, please refer to Figure 1 and Figure 2 When the valve head 210 closes the valve port 121, the limiting protrusion 211 is located within the limiting groove 123 and is not exposed in the flow hole 122. It can be understood that when the valve head 210 closes the valve port 121, the contact between the valve port 121 and the valve needle not only achieves the function of closing the valve port 121, but also stops the sliding of the valve head 210. The end of the valve head 210 facing the valve port 121 is tapered, forming a seal and stopping the stroke of the valve needle assembly 200 by inserting it into the valve port 121. Thus, after the valve head 210 closes the valve port 121, the limiting protrusion 211 is located within the limiting groove 123, which avoids interfering with the flow of refrigerant through the flow hole 122, ensuring that the refrigerant can smoothly pass through the flow hole 122, reducing energy loss and noise. Furthermore, the limiting protrusion 211 is located in the limiting groove 123, avoiding direct exposure to the refrigerant flow and reducing wear caused by impurities, particulate matter, and temperature in the refrigerant. This ensures the stability of the circumferential limiting fit between the limiting protrusion 211 and the limiting groove 123. Of course, in other embodiments, the limiting groove 123 can also be formed with a groove wall facing the flow hole 122. When the valve head 210 closes the valve port 121, this groove wall can be used to limit and stop the limiting protrusion 211, thereby reducing the probability of the valve needle assembly 200 over-inserting and closing the valve port 121, and thus preventing damage to the valve head 210 or the valve port 121, or the valve head 210 from getting stuck in the valve port 121.

[0060] Regarding the number and distribution of the limiting protrusions 211 and the limiting grooves 123, in one embodiment, please refer to... Figure 4 , Figure 5 , Figure 7 and Figure 8 The electronic expansion valve includes at least two limiting protrusions 211 and at least two limiting grooves 123, with the two limiting protrusions 211 or the two limiting grooves 123 evenly spaced along the circumference of the valve needle assembly 200. It is understood that, for an even number of limiting protrusions 211, the limiting protrusions 211 are symmetrically distributed radially in the valve needle assembly 200. For an odd number of limiting protrusions 211, they are radially misaligned and circumferentially uniform. The distribution of the limiting grooves 123 is equivalent to the distribution of the limiting protrusions 211. In this way, when the limiting protrusions 211 and the limiting grooves 123 are subjected to sliding force in the circumferential direction, the force on the valve needle assembly 200 can be balanced, ensuring the stability of the valve needle assembly 200 sliding axially. Furthermore, after the valve needle assembly 200 closes the valve port 121, the uniformity of the force and deformation at all points in the circumferential direction of the valve port 121 is ensured, preventing eccentric deformation of the valve port 121 and guaranteeing the sealing performance of the valve port 121 after the valve needle assembly 200 closes the valve port 121, thereby reducing the risk of internal leakage in the electronic expansion valve. Of course, in other embodiments, the electronic expansion valve may also have only one limiting protrusion 211 and one limiting groove 123.

[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. This refrigeration device can be applied to vehicles, or it can be configured as a refrigerator, air conditioner, heat pump water heater, or other types of equipment.

[0062] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection 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 scope of protection of the present utility model.

Claims

1. An electronic expansion valve, characterized in that, include: The valve body includes a nut seat and a valve port seat, the nut seat and the valve port seat are connected and enclose a valve cavity, and the valve port seat is provided with a valve port and a flow hole communicating with the valve cavity; A valve needle assembly, comprising a lead screw and a valve head, wherein the lead screw and the valve head are rotatably connected by a bearing and fixed in the axial direction, the lead screw is screwed to the nut seat to drive the valve head to slide within the valve cavity, and the valve head is used to open or close the valve port; The valve head and the valve cavity are provided with a limiting groove and a limiting protrusion, respectively. The limiting groove extends along the sliding direction of the valve head, and the limiting protrusion and the limiting groove slide together in the extending direction of the limiting groove.

2. The electronic expansion valve as described in claim 1, characterized in that, The limiting groove and the limiting protrusion have a gap in the radial direction of the valve needle assembly.

3. The electronic expansion valve as described in claim 2, characterized in that, The gap between the limiting groove and the limiting protrusion in the radial direction of the valve needle assembly is H, which satisfies: 0.05mm≤H≤0.15mm.

4. The electronic expansion valve as described in claim 1, characterized in that, The limiting protrusion has two limiting walls distributed opposite each other in the circumferential direction of the valve needle assembly. The limiting walls are arranged radially parallel to the valve needle assembly. The limiting groove slides against the two groove sidewalls opposite each other in the circumferential direction of the valve needle assembly and the two limiting walls one-to-one.

5. The electronic expansion valve as described in claim 4, characterized in that, The gap between the limiting wall and the side wall of the limiting groove is S, which satisfies: 0.01mm≤S≤0.05mm.

6. The electronic expansion valve as described in claim 1, characterized in that, The limiting groove is disposed on the cavity wall of the valve chamber, and the limiting protrusion is disposed on the valve head.

7. The electronic expansion valve as described in claim 6, characterized in that, The valve body has a stop surface at the end of the limiting groove away from the valve port. When the valve head opens the valve port to the limit position, the stop surface and the limiting protrusion abut against each other along the sliding direction of the valve needle assembly.

8. The electronic expansion valve as described in claim 7, characterized in that, The limiting groove is disposed on the valve seat and extends through the end of the valve seat away from the valve port. The stop surface is disposed on the side of the nut seat opposite to the limiting groove along the axial direction of the valve needle assembly.

9. The electronic expansion valve as described in claim 6, characterized in that, The width of the limiting groove is smaller than the diameter of the flow hole.

10. The electronic expansion valve as described in claim 9, characterized in that, The limiting groove is located on the side of the flow hole away from the valve port, and the limiting groove extends through and communicates with the flow hole.

11. The electronic expansion valve as described in claim 10, characterized in that, When the valve head closes the valve port, the limiting protrusion is located in the limiting groove and is not exposed in the flow hole.

12. The electronic expansion valve according to any one of claims 1 to 11, characterized in that, The electronic expansion valve includes at least two limiting protrusions and at least two limiting grooves, wherein the two limiting protrusions or the two limiting grooves are evenly spaced along the circumference of the valve needle assembly; And / or, the material of the nut seat includes polyphenylene sulfide material and glass fiber or carbon fiber with a content of 10% to 30%.

13. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 12.

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