Electronic valve and refrigeration appliance

Abstract

This utility model discloses an electronic valve and a refrigeration device, relating to the field of refrigeration control technology. The electronic valve includes a valve body, a valve needle assembly, and a sealing ring. The valve body has a valve cavity and a valve port communicating with it. The valve needle assembly is located within the valve cavity and can reciprocate along the valve port direction. It includes a valve needle and a sealing element. The valve needle end has a tapered adjustment section for adjusting the flow rate. The sealing element is sleeved around the valve needle, partially protruding laterally from the adjustment section, for achieving a sealing fit when the valve needle approaches the valve port. The sealing ring is located between the valve needle and the sealing element to prevent refrigerant leakage caused by the gap between them. This utility model, through a division of labor design, allows the valve needle to only handle flow rate adjustment, while the sealing element undertakes the sealing function, reducing the requirements for the machining and assembly precision of the valve needle. Even with coaxiality deviations, the sealing performance is not affected. The sealing ring further isolates the leakage path, completely solving the internal leakage problem.

Description

Technical Field

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

[0002] In the air conditioning systems of new energy vehicles, electronic expansion valves are widely used to control the flow of refrigerant. Compared with traditional mechanical expansion valves, electronic expansion valves have advantages such as convenient operation, small size, high adjustment accuracy, and stable response. Their working principle involves changing the size of the fluid passage through the cooperation between the valve needle and the valve port, thereby achieving precise flow control and sealing. However, some problems exist in actual use. For example, the valve needle and valve port are usually made of high-hardness materials, which, while improving wear resistance, also brings difficulties in processing—it's not easy to achieve very precise specifications such as roundness and surface finish. Furthermore, it's difficult to perfectly align the valve during assembly, leading to incomplete sealing. Internal leakage may occur when the valve is fully closed, meaning that refrigerant will slowly leak even when the system is shut down or under low load.

[0003] This internal leakage can negatively impact the entire refrigeration system. For example, problems such as system pressure imbalance, decreased energy efficiency, and unstable compressor operation may occur. Users will also noticeably experience poorer cooling performance, abnormal compressor noise, evaporator frosting, and low superheat. Utility Model Content

[0004] The main objective of this invention is to provide an electronic valve and a refrigeration device, specifically an electronic valve designed to reduce internal leakage.

[0005] To achieve the above objectives, the electronic valve proposed in this utility model includes:

[0006] The valve body has a valve cavity and a valve port communicating with the valve cavity;

[0007] A valve needle assembly, disposed in the valve cavity, is movably arranged in directions approaching and away from the valve port. The valve needle assembly includes a valve needle and a seal. The valve needle has an adjusting section at its end near the valve port for extending into the valve port. The adjusting section is used to adjust the flow rate of the electronic valve when the valve needle moves. The seal is sleeved around the valve needle and located inside the valve cavity. At least a portion of the seal is laterally protruding from the adjusting section for sealingly engaging with the valve port when the valve needle moves towards the valve port.

[0008] A sealing ring is disposed between the valve needle and the sealing element to seal the valve needle and the sealing element.

[0009] In one embodiment, a mounting groove is formed between the surfaces of the seal and the valve needle that are disposed opposite to each other, the mounting groove extending circumferentially along the valve needle, and the sealing ring is mounted in the mounting groove.

[0010] In one embodiment, the outer wall of the valve needle is recessed with an annular groove along its circumference, the seal is installed in the annular groove, and the inner wall of the annular groove is recessed with the mounting groove.

[0011] In one embodiment, the valve needle includes:

[0012] A valve needle body, wherein the end of the valve needle body facing the valve port is provided with a connecting hole; and,

[0013] A valve needle includes a needle head and a connecting portion. The connecting portion extends outward from one end of the needle head away from the valve port. The connecting portion extends into the connecting hole to connect with the valve needle body. The needle head includes the adjusting section.

[0014] The needle head is spaced apart from the valve needle body to define an annular groove between the valve needle head and the valve needle body, and the seal is installed in the annular groove.

[0015] In one embodiment, the valve body is provided with a communicating hole that communicates with the valve cavity. The communicating hole is configured as a stepped hole, forming a first hole segment, a second hole segment, and a third hole segment with the diameter decreasing sequentially from the inside to the outside. A first step portion is formed at the junction of the first hole segment and the second hole segment, and a second step portion is formed at the junction of the second hole segment and the third hole segment. The second hole segment and the third hole segment form the valve port, and the sealing element is sealed in conjunction with the first step portion.

[0016] In one embodiment, the outer peripheral wall of the seal is inclined outward in a direction away from the needle head to seal against the corner of the first step portion.

[0017] In one embodiment, the needle head includes a straight section and a first tapered section arranged sequentially in the direction away from the connecting portion:

[0018] The diameter of the third hole segment is D1, and the outer diameter of the straight segment is D2, where D1 > D2; and / or,

[0019] The vertex angle corresponding to the seal is A, and the vertex angle corresponding to the first cone segment is B, where A > B.

[0020] In one embodiment, the diameter of the end face of the seal facing the needle head is set to be larger than the diameter of the second hole segment, and the end face of the seal facing the needle head is sealed to the upper edge of the second hole segment.

[0021] In one embodiment, the needle head includes a second tapered segment, a straight segment, and a first tapered segment arranged sequentially in a direction away from the connecting portion:

[0022] The diameter of the third hole segment is d1, and the outer diameter of the straight segment is d2, where d1 > d2; and / or,

[0023] The diameter of the second hole is d3, and the maximum cross-sectional diameter of the second cone is d4, where d3 > d4.

[0024] In one embodiment, the valve needle is made of metal; and / or,

[0025] The sealing ring is made of rubber; and / or,

[0026] The sealing element can be made of plastic or rubber.

[0027] This utility model also proposes a refrigeration device, which includes an electronic valve, the electronic valve comprising:

[0028] The valve body has a valve cavity and a valve port communicating with the valve cavity;

[0029] A valve needle assembly, disposed in the valve cavity, is movably arranged in directions approaching and away from the valve port. The valve needle assembly includes a valve needle and a seal. The end of the valve needle near the valve port has an adjusting section for extending into the valve port. The adjusting section is tapered and used to adjust the flow rate of the electronic valve when the valve needle moves. The seal is sleeved around the valve needle and located inside the valve cavity. At least a portion of the seal protrudes laterally from the adjusting section for sealingly engaging with the periphery of the valve port when the valve needle moves towards the valve port.

[0030] A sealing ring is disposed between the valve needle and the sealing element to seal the valve needle and the sealing element.

[0031] In one embodiment, the refrigeration equipment includes an air conditioning system or a heat pump system.

[0032] In this invention, the valve needle only regulates the flow rate; its tapered regulating section only needs to form a controllable flow path with the valve port, without directly participating in the sealing action. The sealing element performs the sealing function, thereby reducing the requirements for the manufacturing and assembly precision of the valve needle. Even if there is a certain degree of eccentricity or error between the valve needle and the valve port, it will not significantly affect the sealing performance. The sealing ring is placed between the valve needle and the sealing element in the assembly gap, effectively blocking the leakage path formed by the assembly gap and completely eliminating the risk of internal leakage of refrigerant in the closed state. This electronic valve can reduce the high requirements for the coaxiality between the valve needle and the valve port while ensuring the accuracy of flow regulation, thus improving assembly efficiency and product consistency. Attached Figure Description

[0033] 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.

[0034] Figure 1 A schematic diagram of an embodiment of the electronic valve provided by this utility model;

[0035] Figure 2 for Figure 1 A magnified view of a section at point X;

[0036] Figure 3 for Figure 1 A cross-sectional view of the valve needle;

[0037] Figure 4 for Figure 1 A cross-sectional view of the valve body at the valve port;

[0038] Figure 5 A schematic diagram of another embodiment of the electronic valve provided by this utility model;

[0039] Figure 6 for Figure 5 A magnified view of a portion of point Y in the middle;

[0040] Figure 7 for Figure 5 A cross-sectional view of the valve needle;

[0041] Figure 8 for Figure 5 A cross-sectional view of the valve body at the valve port.

[0042] Explanation of icon numbers:

[0043] 100. Electronic valve; 10. Valve body; a. Valve cavity; b. Valve port; 20. Valve needle assembly; 1. Valve needle; 1201. Adjustment section; 2. Seal; 3. Sealing ring; 1a. Mounting groove; 1b. Annular groove; 11. Valve needle body; 11a. Connecting hole; 12. Valve needle head; 121. Needle head; 1211. Straight section; 1212. First conical section; 1213. Second conical section; 122. Connecting part; b1. First hole section; b2. Second hole section; b3. Third hole section; 101. First step section; 102. Second step section.

[0044] 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

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Traditional electronic valves achieve precise flow control and sealing by altering the size of the fluid passage through the interaction between the valve needle and valve port. However, this process presents several challenges in practical applications. For instance, the valve needle and valve port are typically made of high-hardness materials, which, while improving wear resistance, also presents manufacturing difficulties—achieving precise control over parameters such as roundness and surface finish is challenging. Furthermore, achieving perfect center alignment during assembly can lead to incomplete sealing, potentially causing internal leakage when the valve is fully closed.

[0049] This utility model proposes an electronic valve 100, which aims to provide an electronic valve that can reduce internal leakage.

[0050] Please see Figures 1 to 4In one embodiment of this utility model, the electronic valve 100 includes a valve body 10, a valve needle assembly 20, and a sealing ring 3. The valve body 10 has a valve cavity a and a valve port b communicating with the valve cavity a. The valve needle assembly 20 is disposed in the valve cavity a and is movably disposed in the direction of approaching and away from the valve port b. The valve needle assembly 20 includes a valve needle 1 and a sealing member 2. The end of the valve needle 1 near the valve port b has an adjusting section 1201 for extending into the valve port b. The adjusting section 1201 is used to adjust the flow rate of the electronic valve 100 when the valve needle 1 moves. The sealing member 2 is sleeved around the valve needle 1 and located inside the valve cavity a. At least part of the sealing member 2 is laterally protruding from the adjusting section 1201 for sealing cooperation with the valve port b when the valve needle 1 moves towards the valve port b. The sealing ring 3 is annularly disposed between the valve needle 1 and the sealing member 2 to seal between the valve needle 1 and the sealing member 2.

[0051] The valve body 10 has a valve chamber a inside, and a valve port b is formed at one end of the valve chamber a for controlling the inlet and outlet of refrigerant. The valve needle assembly 20 is disposed in the valve chamber a and can move towards or away from the valve port b, thereby achieving flow regulation.

[0052] Specifically, the valve needle assembly 20 includes a valve needle 1 and a seal 2. One end of the valve needle 1 has an adjusting section 1201, which can extend into the valve port b. By changing its relative position with the valve port b, the cross-sectional area of ​​the flow channel formed between them is adjusted, thereby achieving continuous and precise control of the refrigerant flow rate. It can be understood that the adjusting section 1201 can be cone-shaped, with the gap between it and the periphery of the valve port b decreasing as it approaches and extends into the valve port b, thus gradually reducing the flow rate. Alternatively, the adjusting section 1201 can be cylindrical, with the gap between it and the upper edge of the valve port b decreasing as it approaches the valve port b, also gradually reducing the flow rate.

[0053] The sealing element 2 is sleeved around the valve needle 1 and located inside the valve cavity a. At least a portion of the sealing element 2 is laterally protruding from the outer periphery of the adjusting section 1201 in its structural design. When the valve needle 1 moves toward the valve port b, the sealing element 2 can fit tightly against the area around the valve port b, achieving a reliable sealing function and preventing refrigerant leakage when the valve is closed.

[0054] It should be noted that since valve needle 1 and seal 2 are usually separate structures, there will inevitably be a certain gap during the assembly process. Especially when different parts have different coefficients of thermal expansion, or when affected by external factors such as vibration and pressure changes, these gaps are more likely to form "hidden channels" for refrigerant flow, resulting in a slight leakage of the valve even when it is closed, which is called "internal leakage".

[0055] By setting an annular sealing ring 3 with a certain amount of compression between the valve needle 1 and the sealing element 2, the sealing ring 3 can fit tightly between the two, forming an effective sealing barrier.

[0056] It should be noted that the sealing ring 3 is preferably made of an elastic material that is resistant to low temperatures and high pressures and has good resilience, which can maintain a stable sealing effect under various operating conditions. When the electronic valve 100 is in the closed state, the sealing ring 3 can effectively prevent refrigerant from leaking from the gap between the valve needle 1 and the sealing element 2; while during the process of the valve needle 1 adjusting the flow, the sealing ring 3 can maintain good following and sealing performance and will not fail to seal due to movement.

[0057] In the traditional structure, the valve needle 1 is not only responsible for adjusting the size of the flow channel, but also needs to directly contact the valve port b to achieve a seal. This places extremely high demands on the machining accuracy, material properties and assembly process of the valve needle 1. In particular, the coaxiality between the valve needle 1 and the valve port b is very strict. Otherwise, it is easy to have problems such as poor sealing or insensitive adjustment, which will affect the stability and energy efficiency of the entire system.

[0058] In this invention, the valve needle 1 only functions to regulate flow rate. Its conical regulating section 1201 only needs to form a controllable flow path with the valve port b, without directly participating in the sealing action. The sealing element 2 performs the sealing function, thereby reducing the requirements for the manufacturing and assembly precision of the valve needle 1. Even if there is a certain degree of eccentricity or error between the valve needle 1 and the valve port b, it will not significantly affect the sealing performance. The sealing ring 3 is set between the assembly gap of the valve needle 1 and the sealing element 2, effectively blocking the leakage path formed by the assembly gap and completely solving the risk of internal leakage of refrigerant in the closed state. This electronic valve 100 can reduce the high requirements for the coaxiality between the valve needle 1 and the valve port b while ensuring the accuracy of flow rate regulation, thereby improving assembly efficiency and product consistency.

[0059] Specifically, please refer to Figure 2 and Figure 6 In this embodiment, a mounting groove 1a is formed between the surfaces of the sealing member 2 and the valve needle 1 that are disposed opposite to each other. The mounting groove 1a extends along the circumference of the valve needle 1, and the sealing ring 3 is installed in the mounting groove 1a.

[0060] During assembly, the sealing ring 3 is embedded into the mounting groove 1a, and the groove's structure limits and fixes it, thereby preventing the sealing ring 3 from shifting, falling off, or twisting during installation or operation. Preferably, the cross-sectional diameter of the sealing ring 3 is larger than the groove depth of the mounting groove 1a, so that the sealing ring 3 partially protrudes from the mounting groove 1a after assembly, forming a pre-tightening pressure with the mating parts, thereby enhancing the sealing effect.

[0061] By fixing the sealing ring 3 with an annular mounting groove 1a between the seal 2 and the valve needle 1, the assembly accuracy and stability of the sealing ring 3 are improved compared to the traditional method of directly fitting the sealing ring 3 onto a smooth surface. The presence of the mounting groove 1a provides a clear positioning space for the sealing ring 3, effectively preventing misalignment or skew during assembly and reducing sealing failure caused by human error.

[0062] For further information, please refer to [link / reference]. Figure 2 and Figure 6 In this embodiment, the outer wall of the valve needle 1 is recessed with an annular groove 1b along its circumference, the seal 2 is installed in the annular groove 1b, and the inner wall of the annular groove 1b is recessed with the mounting groove 1a.

[0063] Understandably, the mounting groove 1a also extends circumferentially along the valve needle 1, forming an annular space for embedding and positioning the sealing ring 3. Through this structural design, the sealing ring 3 can be accurately installed at the mating position between the sealing element 2 and the valve needle 1, thereby achieving effective sealing of the gap between the two.

[0064] Preferably, the size and shape of the annular groove 1b are designed to match the shape of the seal 2, so that it can play a good limiting role for the seal 2. Even when the system is affected by factors such as vibration and pressure fluctuation during operation, it can effectively prevent the seal 2 from axial or radial displacement, thereby ensuring the stability and reliability of the entire sealing structure.

[0065] For more details, please continue reading. Figure 2 and Figure 6 In this embodiment, the valve needle 1 includes a valve needle body 11 and a valve needle head 12. The valve needle body 11 has a connecting hole 11a at the end facing the valve port b. The valve needle head 12 includes a needle head 121 and a connecting portion 122. The connecting portion 122 extends outward from the end of the needle head 121 away from the valve port b. The connecting portion 122 extends into the connecting hole 11a to connect with the valve needle body 11. The needle head 121 includes the adjusting section 1201. The needle head 121 and the valve needle body 11 are spaced apart to define an annular groove 1b between the valve needle head 12 and the valve needle body 11. The sealing member 2 is installed in the annular groove 1b.

[0066] During assembly, the sealing element 2 is first fitted around the connecting portion 122 of the valve needle head 12, with its lower end face abutting against the end face of the needle head 121, serving as an axial limiting function. Then, the connecting portion 122 is inserted into the connecting hole 11a of the valve needle body 11, completing the assembly of the valve needle head 12 and the valve needle body 11. At this point, a certain gap remains between the needle head 121 of the valve needle head 12 and the valve needle body 11, naturally forming an annular groove 1b between them. This annular groove 1b is used to install the sealing element 2.

[0067] Because a certain space is reserved between the valve needle 12 and the valve needle body 11, an annular groove 1b is formed that can accommodate the seal 2. Under conditions of frequent system start-up and shutdown, drastic temperature changes, or vibration, the seal 2 is not prone to falling off or becoming misaligned, thus effectively ensuring the sealing performance of the electronic valve 100.

[0068] Furthermore, the valve needle 1 is configured as a separate structure consisting of the valve needle body 11 and the valve needle head 12, giving the valve needle 1 a certain degree of maintainability and modularity. When the valve needle head 12 wears out or needs to be replaced with an adjustment section 1201 of a different specification, it is not necessary to replace the entire valve needle assembly 20; only the valve needle head 12 needs to be disassembled, reducing maintenance costs and improving the product's flexibility and adaptability.

[0069] Specifically, please refer to Figure 4 and Figure 8 In one embodiment, the valve body 10 is provided with a communicating hole that communicates with the valve cavity a. The communicating hole is configured as a stepped hole, forming a first hole segment b1, a second hole segment b2, and a third hole segment b3 with the diameter decreasing sequentially from the inside to the outside. A first step portion 101 is formed at the junction of the first hole segment b1 and the second hole segment b2, and a second step portion 102 is formed at the junction of the second hole segment b2 and the third hole segment b3. The second hole segment b2 and the third hole segment b3 form the valve port b, and the sealing member 2 is sealed in conjunction with the first step portion 101.

[0070] Understandably, the first orifice segment b1 is located on the innermost side, closest to the valve cavity a, and has the largest orifice diameter; the second orifice segment b2 is located in the middle, with a smaller orifice diameter than the first orifice segment b1; and the third orifice segment b3 is located on the outermost side, with the smallest orifice diameter. A first step portion 101 and a second step portion 102 are formed between adjacent orifice segments, respectively. The outermost portion of the connecting hole (i.e., the third orifice segment b3) constitutes the valve port b of the valve, used to cooperate with the valve needle assembly 20 to achieve flow control.

[0071] During the operation of the valve needle assembly 20, the tapered adjusting section 1201 gradually enters different sections of the connecting hole. Since the diameter of each section decreases from the inside to the outside, as the valve needle 1 moves towards the valve port b, the gap between the adjusting section 1201 and the connecting hole gradually narrows, thereby achieving step-by-step regulation of the refrigerant flow and improving the control accuracy and stability of the electronic valve 100 under low flow conditions.

[0072] Specifically, when the electronic valve 100 is in the open state, the valve needle assembly 20 is driven upward by the drive mechanism, causing the conical adjusting section 1201 of the valve needle 1 to partially or completely exit different sections of the connecting hole, thereby opening the refrigerant flow channel. At this time, the refrigerant can enter from the valve cavity a through the first section b1, and flow out through the second section b2 and the third section b3 in sequence, forming a complete flow path.

[0073] When it is necessary to reduce or shut off the flow, the valve needle assembly 20 moves downward, and the tapered adjusting section 1201 is gradually inserted into different orifice sections. Because the orifice diameters of each section are different, the annular gap between the valve needle 1 and the orifice wall decreases accordingly each time the valve needle 1 enters a new orifice section, thereby achieving step-by-step adjustment of the refrigerant flow. This "multi-stage throttling" method not only improves the accuracy of flow control but also avoids the sudden flow changes that may occur in traditional single-orifice structures, making the system operation more stable.

[0074] Especially when approaching the closed state, the valve needle 1 moves further down, and the seal 2 finally fits tightly against the first step 101, completing the final sealing action and cutting off the refrigerant flow path. During this process, the matching relationship between the tapered regulating section 1201 and different orifice sections ensures stable and linear flow output even at small openings.

[0075] In the first embodiment, please refer to Figures 1 to 4 The outer peripheral wall of the sealing member 2 is inclined outward in a direction away from the needle head 121 to seal against the corner of the first step portion 101.

[0076] It is understandable that the first step 101 is located at the intersection of two different hole sections, and its geometry has certain sharp edges or transition areas. Traditional planar sealing structures are difficult to completely cover these areas, which can easily lead to local leakage points.

[0077] To enhance the sealing effect, the outer peripheral wall of the seal 2 is inclined outward in the direction away from the needle head 121, that is, its diameter gradually increases from top to bottom, forming an overall conical structure. This design allows the seal 2 to better fit the corner area of ​​the first step 101, especially at the edge formed by the intersection of different hole segments in the step, thereby achieving a tighter and more uniform contact seal.

[0078] Preferably, the seal 2 is made of a material with a certain degree of elasticity, which can produce slight compression deformation in the assembled state, so that its outer peripheral wall can fully fit the contour shape of the first step 101, especially the irregular transition area at the corner of the step, thereby effectively preventing refrigerant leakage at the sealing interface.

[0079] In this embodiment, the needle head 121 includes a straight section 1211 and a first tapered section 1212 arranged sequentially in the direction away from the connecting portion 122; the diameter of the third hole section b3 is D1, and the outer diameter of the straight section 1211 is D2, where D1 > D2.

[0080] It is understood that the valve needle 12 includes a straight section 1211 and a first conical section 1212 arranged in sequence, wherein: the straight section 1211 is located on the side close to the connecting part 122 and its outer diameter is D2; the first conical section 1212 is located on the side away from the connecting part 122 and has a conical contraction structure for realizing throttling control.

[0081] The diameter of the third hole section b3 (i.e., valve port b) on the valve body 10 is D1, which is larger than the outer diameter D2 of the straight section 1211. This ensures that when the valve needle 1 is inserted into the valve port b, there is always a certain gap between the straight section 1211 and the inner wall of the valve port b. Even if there is a certain degree of coaxiality deviation or assembly error between the valve needle 1 and the valve port b, it will not cause friction or jamming between the valve needle 1 and the inner wall of the valve port b, thereby reducing the requirements for manufacturing and assembly precision.

[0082] In this embodiment, the vertex angle corresponding to the seal 2 is A, and the vertex angle corresponding to the first cone segment 1212 is B, where A > B.

[0083] It should be noted that during the gradual closing of valve needle 1, the first cone section 1212 of valve needle 1 first slowly intervenes in throttling, and then the first cone section 1212 of seal 2 intervenes in throttling. Since the apex angle of seal 2 is larger, it means that the flow area between seal 2 and the first step 101 is increased, and finally a seal is achieved. With this setting, the degree of throttling change gradually increases, making the whole throttling process more stable and controllable.

[0084] If the apex angle relationship is reversed (i.e., A < B), the throttling degree of the first cone section 1212 of valve needle 1 is greater than that of the first cone section 1212 of seal 2. When valve needle 1 approaches valve port b, the larger bottom contacts the fluid first, which may rapidly reduce the flow area, leading to an increase in local flow velocity, and thus potentially triggering a throttling effect.

[0085] Therefore, this application effectively avoids these problems by using angle matching design, thereby improving the control accuracy and operational comfort of the electronic valve 100 in a low opening state.

[0086] In the second embodiment, please refer to Figures 5 to 8 The diameter of the end face of the sealing member 2 facing the needle head 121 is set to be larger than the diameter of the second hole section b2, and the end face of the sealing member 2 facing the needle head 121 is sealed to the upper edge of the second hole section b2.

[0087] By setting the diameter of the end face of the seal 2 facing the needle head 121 to be larger than the diameter of the second hole section b2, the end face can completely cover and fit the upper edge area of ​​the second hole section b2, and form a sealing fit between the end face and the upper edge of the second hole section b2, thereby effectively blocking the possible path of refrigerant leakage from this part and achieving another form of reliable sealing.

[0088] By making the seal 2 contact the upper edge of the second hole section b2, since the end face of the seal 2 covers the upper edge area of ​​the second hole section b2, its contact area is larger and the force is more uniform. Compared with point contact or line contact, it has stronger pressure resistance and adaptability.

[0089] In this embodiment, the needle head 121 includes a second conical segment 1213, a straight segment 1211, and a first conical segment 1212 arranged sequentially in the direction away from the connecting portion 122; the diameter of the third hole segment b3 is d1, the outer diameter of the straight segment 1211 is d2, and d1 > d2; and / or, the diameter of the second hole segment b2 is d3, and the maximum cross-sectional diameter of the second conical segment 1213 is d4, and d3 > d4.

[0090] First, the diameter d1 of the third orifice section b3 (i.e., valve port b) is designed to be larger than the outer diameter d2 of the straight section 1211 of the valve needle 1, ensuring that the valve needle 1 always maintains a certain gap when inserted into the valve port b. Even if there is a certain degree of coaxiality deviation or assembly error between the valve needle 1 and the valve port b, it will not cause friction or jamming between the valve needle 1 and the inner wall of the valve port b, thus effectively avoiding operational instability or sealing failure caused by mechanical interference.

[0091] Secondly, the orifice diameter d3 of the second section b2 is designed to be larger than the maximum cross-sectional diameter d4 of the second conical section 1213, so that the valve needle 12 can maintain good guidance and freedom of movement when entering the orifice. This reduces the resistance of the valve needle 1 during movement and also prevents wear or deformation caused by local contact.

[0092] In actual operation, as the valve needle 1 moves downward, the second conical section 1213 first enters the second hole section b2, followed by the straight section 1211 entering the third hole section b3 (i.e., valve port b), and finally the sealing action in the closed state is completed by the sealing element 2. Since appropriate fitting clearances are left between each section, not only are the requirements for machining accuracy reduced, but assembly efficiency and product consistency are also improved.

[0093] Specifically, the valve needle 1 is made of a metal material, such as stainless steel, brass, or aluminum alloy, which have high strength and wear resistance. This material selection not only ensures that the valve needle 1 has good mechanical strength and durability during frequent opening and closing, but also ensures that it can maintain a stable geometry under complex working conditions (such as high temperature, high pressure, or vibration environment), thereby improving the overall performance and service life of the electronic valve 100.

[0094] Meanwhile, the sealing ring 3 is preferably made of rubber, such as fluororubber (FKM), nitrile rubber (NBR), or silicone rubber, which have good elasticity and corrosion resistance. This sealing ring 3 is used to achieve a sealed connection between the valve needle 1 and the sealing element 2. Under compression, it can deform appropriately to fill the tiny gap between them, effectively preventing refrigerant leakage and improving the sealing reliability of the electronic valve 100.

[0095] Furthermore, the material of the seal 2 can be plastic, such as engineering plastics with certain self-lubricating and wear-resistant properties, such as polytetrafluoroethylene (PTFE), polyamide (PA), or polyoxymethylene (POM); it can also be rubber, depending on the actual application requirements. Choosing plastic or rubber as the material of the seal 2 can, on the one hand, utilize their good resilience and conformability to enhance the sealing effect, and on the other hand, help reduce assembly friction and improve smoothness of movement.

[0096] This utility model also proposes a refrigeration device, which includes an air conditioning system or a heat pump system. The refrigeration device includes a heat exchanger and an electronic valve 100. The specific structure of the electronic valve 100 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.

[0097] 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 valve characterized by, include: The valve body has a valve cavity and a valve port communicating with the valve cavity; A valve needle assembly is disposed in the valve cavity and is movably disposed in the direction of approaching and away from the valve port. The valve needle assembly includes a valve needle and a seal. The valve needle has an adjustment section at one end near the valve port for extending into the valve port. The adjustment section is used to adjust the flow rate of the electronic valve when the valve needle moves. The seal is sleeved around the valve needle and located inside the valve cavity. At least a portion of the seal is laterally protruding from the adjustment section for sealing cooperation with the valve port when the valve needle moves toward the valve port. as well as, A sealing ring is disposed between the valve needle and the sealing element to seal the valve needle and the sealing element.

2. The electronic valve of claim 1, wherein A mounting groove is formed between the surfaces of the seal and the valve needle that are disposed opposite to each other. The mounting groove extends along the circumference of the valve needle, and the sealing ring is mounted in the mounting groove.

3. The electronic valve of claim 2, wherein, The outer wall of the valve needle is recessed with an annular groove along its circumference, the seal is installed in the annular groove, and the inner wall of the annular groove is recessed with the mounting groove.

4. The electronic valve according to any one of claims 1 to 3, wherein The valve needle includes: A valve needle body, wherein the end of the valve needle body facing the valve port is provided with a connecting hole; and, A valve needle includes a needle head and a connecting portion. The connecting portion extends outward from one end of the needle head away from the valve port. The connecting portion extends into the connecting hole to connect with the valve needle body. The needle head includes the adjusting section. The needle head is spaced apart from the valve needle body to define an annular groove between the valve needle head and the valve needle body, and the seal is installed in the annular groove.

5. The electronic valve of claim 4, wherein The valve body is provided with a connecting hole that communicates with the valve cavity. The connecting hole is configured as a stepped hole, forming a first hole segment, a second hole segment, and a third hole segment with the diameter decreasing sequentially from the inside to the outside. A first step portion is formed at the junction of the first hole segment and the second hole segment, and a second step portion is formed at the junction of the second hole segment and the third hole segment. The second hole segment and the third hole segment form the valve port, and the sealing element is sealed in conjunction with the first step portion.

6. The electronic valve of claim 5, wherein The outer peripheral wall of the seal is inclined outward in a direction away from the needle head to seal against the corner of the first step portion.

7. The electronic valve as described in claim 6, characterized in that, The needle head includes a straight section and a first tapered section arranged sequentially in the direction away from the connecting part: The diameter of the third hole segment is D1, and the outer diameter of the straight segment is D2, where D1 > D2; and / or, The vertex angle corresponding to the seal is A, and the vertex angle corresponding to the first cone segment is B, where A > B.

8. The electronic valve as described in claim 5, characterized in that, The diameter of the end face of the sealing element facing the needle head is set to be larger than the diameter of the second hole section, and the end face of the sealing element facing the needle head is sealed to the upper edge of the second hole section.

9. The electronic valve as described in claim 8, characterized in that, The needle head includes a second tapered segment, a straight segment, and a first tapered segment arranged sequentially in a direction away from the connecting portion: The diameter of the third hole segment is d1, and the outer diameter of the straight segment is d2, where d1 > d2; and / or, The diameter of the second hole is d3, and the maximum cross-sectional diameter of the second cone is d4, where d3 > d4.

10. The electronic valve as claimed in claim 1, characterized in that, The valve needle is made of metal; and / or, The sealing ring is made of rubber; and / or, The sealing element can be made of plastic or rubber.

11. A refrigeration device, characterized in that, Includes the electronic valve as described in any one of claims 1 to 10.

12. The refrigeration equipment as described in claim 11, characterized in that, The refrigeration equipment includes an air conditioning system or a heat pump system.

Images