Electronic expansion valve, air conditioner and automobile

Abstract

The utility model discloses an electronic expansion valve, air conditioner and car relates to electronic expansion valve technical field, wherein, electronic expansion valve includes valve needle structure, the valve needle structure includes first valve needle, sealing washer and second valve needle, first valve needle is equipped with first mobile passageway and with first mobile passageway intercommunication's intercommunication, sealing washer is equipped with first valve port that communicates with first mobile passageway, sealing washer is equipped with the first valve port that communicates with first mobile passageway, the side wall of sealing washer faces first mobile passageway and is equipped with anti -crack sink, anti -crack sink is located the circumference of first valve port, first valve port penetrates the groove bottom of anti -crack sink to with anti -crack sink intercommunication, second valve needle is mobilely arranged in first mobile passageway to open or close first valve port, the utility model provides technical scheme can solve the problem that valve port is easy to crack.

Description

Technical Field

[0001] This utility model relates to the field of electronic expansion valve technology, and in particular to an electronic expansion valve, an air conditioner, and an automobile. Background Technology

[0002] A refrigeration system includes a compressor, evaporator, condenser, and a throttling element. An electronic expansion valve is typically used as the throttling element to control the refrigerant flow in the refrigeration system. Existing electronic expansion valves generally consist of a valve seat and a valve needle. During operation, the valve needle moves within the movement channel of the valve seat, and can move to positions that avoid or block the valve orifice, thereby controlling the flow path within the valve seat.

[0003] Currently, the valve port of electronic expansion valves on the market is prone to cracking due to stress concentration under frequent opening and closing of the valve needle or high-pressure impact. Utility Model Content

[0004] The main purpose of this invention is to propose an electronic expansion valve, an air conditioner, and an automobile, aiming to solve the problem of easy cracking of the valve port.

[0005] To achieve the above objectives, the present invention proposes an electronic expansion valve, which includes a valve needle structure, the valve needle structure comprising:

[0006] A first valve needle, the first valve needle having a first moving channel and a communication port connected to the first moving channel;

[0007] A sealing gasket is disposed at the communication port. The sealing gasket has a first valve port communicating with the first moving channel. A crack-resistant groove is provided on the side wall of the sealing gasket facing the first moving channel. The crack-resistant groove is located around the periphery of the first valve port, and the first valve port penetrates the bottom of the crack-resistant groove to communicate with it.

[0008] The second valve needle is movably disposed in the first moving channel to open or close the first valve port.

[0009] In one embodiment, the anti-crack settling tank includes a first tank section and a second tank section, the first tank section being connected to the first valve port through the second tank section, and the radius of the first tank section being greater than the radius of the second tank section.

[0010] In one embodiment, the second groove segment is tapered in the direction near the first valve port.

[0011] In one embodiment, the first groove segment is tapered in the direction approaching the second groove segment.

[0012] In one embodiment, the cone angle of the second groove segment is greater than the cone angle of the first groove segment.

[0013] In one embodiment, the depth h of the first groove segment is in the range of 0.1 mm ≤ h ≤ 0.4 mm.

[0014] In one embodiment, an abutting arc surface is provided between the second groove segment and the first valve port, the abutting arc surface being used to abut against the second valve needle.

[0015] In one embodiment, the diameter R1 of the anti-crack settling tank is in the range of 3.5mm≤R1≤4.2mm.

[0016] In one embodiment, the ratio of the diameter R2 of the first valve port to the diameter R1 of the anti-crack settling tank ranges from 0.5 to 0.7.

[0017] In one embodiment, the sealing gasket is made of PTFE, PPS, or PEEK.

[0018] In one embodiment, the electronic expansion valve further includes a valve seat, the valve seat having a second moving channel, a second valve port and a peripheral communication port, the second valve port and the peripheral communication port being respectively connected to the second moving channel, and the first valve needle being movably disposed in the second moving channel to open or close the second valve port.

[0019] In one embodiment, the total flow area of ​​the peripheral connecting port is greater than the flow area of ​​the second valve port;

[0020] And / or, the number of the peripheral connecting ports is greater than or equal to 6;

[0021] And / or, the diameter of the peripheral connecting port is greater than or equal to 5 mm.

[0022] This utility model also proposes an air conditioner, including the aforementioned electronic expansion valve.

[0023] This utility model also proposes an automobile that includes the aforementioned air conditioner.

[0024] The technical solution of this utility model is to set an anti-crack groove on the side wall of the sealing gasket facing the moving channel, and the anti-crack groove is located at the periphery of the first valve port. The first valve port penetrates the bottom of the anti-crack groove to communicate with it. By changing the local geometry of the sealing gasket through the design of the anti-crack groove, the stress distribution under frequent opening and closing of the second valve needle or high pressure impact is dispersed, and stress is avoided to concentrate at the edge of the first valve port, thereby reducing the probability of cracking of the first valve port. Attached Figure Description

[0025] 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.

[0026] Figure 1 A partial structural schematic diagram of an embodiment of the electronic expansion valve provided by this utility model;

[0027] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0028] Figure 3 A schematic diagram of the valve needle structure of the electronic expansion valve provided by this utility model;

[0029] Figure 4 for Figure 3 A sectional view of the local structure;

[0030] Figure 5 A schematic diagram of the sealing gasket structure of the valve needle structure of the electronic expansion valve provided by this utility model;

[0031] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure;

[0032] Figure 7 This is a cross-sectional view of the valve seat of the electronic expansion valve of this utility model.

[0033] Explanation of icon numbers:

[0034] 10. Electronic expansion valve; 100. Valve needle structure; 110. First valve needle; 111. First moving channel; 120. Sealing gasket; 121. Anti-crack settling groove; 121a. First groove section; 121b. Second groove section; 122. First valve port; 130. Second valve needle; 200. Valve seat; 210. Second moving channel; 220. Second valve port; 230. Peripheral connecting port.

[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] A refrigeration system includes a compressor, evaporator, condenser, and a throttling element. An electronic expansion valve is typically used as the throttling element to control the refrigerant flow in the refrigeration system. Existing electronic expansion valves generally consist of a valve seat and a valve needle. During operation, the valve needle moves within the movement channel of the valve seat, and can move to positions that avoid or block the valve orifice, thereby controlling the flow path within the valve seat.

[0040] Currently, the valve port of electronic expansion valves on the market is prone to cracking due to stress concentration under frequent opening and closing of the valve needle or high-pressure impact.

[0041] To solve the above problems, this utility model proposes an electronic expansion valve 10.

[0042] Please see Figure 1 and Figure 2In one embodiment of this utility model, the electronic expansion valve 10 includes a valve needle structure 100, which includes a first valve needle 110, a sealing gasket 120, and a second valve needle 130. The first valve needle 110 is provided with a first moving channel 111 and a communication port connected to the first moving channel 111. The sealing gasket 120 is disposed at the communication port and is provided with a first valve port 122 connected to the first moving channel 111. The side wall of the sealing gasket 120 facing the first moving channel 111 is provided with an anti-crack groove 121, which is located around the periphery of the first valve port 122. The first valve port 122 penetrates the bottom of the anti-crack groove 121 and is connected to the anti-crack groove 121. The second valve needle 130 is movably disposed in the first moving channel 111 to open or close the first valve port 122.

[0043] The technical solution of this utility model is to provide an anti-crack groove 121 on the side wall of the sealing gasket 120 facing the moving channel, and the anti-crack groove 121 is located at the periphery of the first valve port 122. The first valve port 122 penetrates the bottom of the anti-crack groove 121 to communicate with it. By changing the local geometry of the sealing gasket 120 through the design of the anti-crack groove, the stress distribution under frequent opening and closing or high pressure impact of the second valve needle 130 is dispersed, and stress is avoided from concentrating at the edge of the first valve port 122, thereby reducing the probability of cracking of the first valve port 122.

[0044] The diameter of the connecting opening is larger than the diameter of the first moving channel 111, so that a step can be formed between the connecting opening and the first moving channel 111. This step can be used to abut against the limiting sealing gasket 120, thereby increasing the installation stability of the sealing gasket 120.

[0045] Optionally, the anti-crack sink 121 includes a first segment 121a and a second segment 121b. The first segment 121a communicates with the first valve port 122 through the second segment 121b. The radius of the first segment 121a is larger than the radius of the second segment 121b. It can be understood that the smaller radius of the second segment 121b, being closer to the valve port, increases the fluid velocity as it approaches the port, while the larger radius of the first segment 121a acts as a buffer or guide in areas far from the first valve port 122. This design may help control the flow state of the fluid entering the valve port, reducing sudden pressure changes and thus reducing cavitation or impact. Secondly, the different radii of the first segment 121a and the second segment 121b can form a transition area, affecting stress distribution, reducing stress concentration, and thus improving the durability of the first valve port 122, preventing cracking or fatigue damage. Of course, this solution is not limited to this; in other embodiments, the anti-crack sink 121 may also have only one segment.

[0046] Optionally, the second groove segment 121b is tapered in the direction near the first valve port 122. It is understood that the gradually decreasing radius of the second groove segment 121b can alter the stress distribution, alleviate stress concentration, and reduce the risk of cracking at the edge of the first valve port 122. Furthermore, the gradually decreasing radius of the second groove segment 121b can gradually accelerate the fluid, forming a stable laminar flow and avoiding turbulence and vortices caused by abrupt changes in cross-section. The tapered second groove segment 121b can also prevent sudden drops in local pressure caused by a sudden increase in flow velocity, thus suppressing cavitation. Of course, this solution is not limited to this; in other embodiments, the radius of the second groove segment 121b may remain unchanged in the direction near the first valve port 122.

[0047] Optionally, in the direction near the second groove segment 121b, the first groove segment 121a is tapered. The gradually decreasing radius of the first groove segment 121a can change the stress distribution, alleviate stress concentration, and reduce the risk of cracking at the valve port edge. Moreover, the gradually decreasing radius of the first groove segment 121a can also gradually accelerate the fluid, forming a stable laminar flow and avoiding turbulence and vortices caused by abrupt changes in cross-section. The tapered structure avoids sudden drops in local pressure caused by a sudden increase in flow velocity, suppressing cavitation. Furthermore, the first groove segment 121a with a gradually decreasing radius in the direction near the second groove segment 121b is also easier to process. Of course, this solution is not limited to this. In other embodiments, the radius of the first groove segment 121a in the direction near the second groove segment 121b can remain unchanged.

[0048] Reference Figures 2 to 6 Furthermore, the depth h of the first groove segment 121a is in the range of 0.1mm≤h≤0.4mm. If the depth h of the anti-crack settling groove 121 is ≤0.1mm, the stress dispersion effect of the anti-crack settling groove 121 will be weak. If 0.4mm≤h, the depth of the anti-crack settling groove 121 will be too large, which will weaken the influence of the opening change of the second valve needle 130 on the flow area, making it difficult for small opening changes to effectively change the flow area and reduce the accuracy of low flow rate regulation. This solution limits the depth h of the anti-crack settling groove 121 to 0.1mm≤h≤0.4mm, which is beneficial to ensure the stress dispersion effect of the anti-crack settling groove 121 while ensuring the accuracy of low flow rate regulation.

[0049] Optionally, the cone angle α2 of the second channel segment 121b is greater than the cone angle α1 of the first channel segment 121a. The smaller cone angle α1 of the first channel segment 121a allows the fluid to contract gently and the flow velocity to increase gradually, avoiding turbulence and eddies caused by sudden changes in flow velocity. The larger cone angle α2 of the second channel segment 121b further accelerates the fluid. This scheme controls the pressure gradient through segmented design, reducing the risk of flow separation. This also helps to reduce flow resistance, reduce energy loss, and suppress noise and vibration. Of course, this scheme is not limited to this. In other embodiments, the cone angle α2 of the second channel segment 121b can also be equal to the cone angle α1 of the first channel segment 121a.

[0050] Optionally, an abutting arc surface is provided between the second groove segment 121b and the first valve port 122. This abutting arc surface abuts against the second valve needle 130. It is understood that the outer circumferential surface of the second valve needle 130 is conical, which facilitates flow control. When the second valve needle 130 closes the first valve port 122, the abutting arc surface abuts against the conical surface of the second valve needle 130, thereby sealing the first valve port 122. A line contact seal is formed between the abutting arc surface and the conical surface of the second valve needle 130. On the one hand, compared to a planar seal, the line contact seal has a tighter contact, reducing leakage. On the other hand, even if the structures of the first valve port 122 and the second valve needle 130 have errors due to machining errors, the arc surface can still make good contact with the conical surface, thereby reducing the impact of machining errors on the sealing effect of the second valve needle 130 and the first valve port 122. An abutting angle may also be provided between the second groove segment 121b and the first valve port 122, and this abutting angle abuts against the second valve needle 130.

[0051] Optionally, the diameter R1 of the anti-crack settling groove 121 is in the range of 3.5mm≤R1≤4.2mm. It is understood that if R1≤3.5mm, the stress dispersion effect of the anti-crack settling groove 121 is weak. If 4.2mm≤R1, it will significantly increase the flow cross-sectional area before the fluid enters the valve port, resulting in a gradual transition in flow velocity or even the appearance of a stagnant zone. The fluid cannot be effectively accelerated, which on the one hand will cause separation due to insufficient inertia when entering the valve port, generating eddies and backflow, increasing energy loss and noise. On the other hand, when the local flow velocity is too low, the boundary layer will thicken, which may trigger turbulence due to uneven flow velocity distribution. This solution limits R1 to 3.5mm≤R1≤4.2mm, which helps to slow down the fluid contraction rate, reduce the local pressure drop rate, suppress cavitation caused by sudden pressure drops, and better disperse the stress at the first valve port 122.

[0052] Furthermore, the ratio of the diameter R2 of the first valve port 122 to the diameter R1 of the anti-crack sink 121 ranges from 0.5 to 0.7. This helps to disperse the impact force of the fluid on the first valve port 122 and reduce the risk of stress concentration. At the same time, it reduces deformation or fatigue cracks in the first valve port 122 and improves reliability under high pressure differential conditions.

[0053] Optionally, in one embodiment, the sealing gasket 120 is made of PTFE (polytetrafluoroethylene), PPS (polyphenylene sulfide), or PEEK (polyether ether ketone).

[0054] In one embodiment, the sealing gasket 120 is made of PTFE (polytetrafluoroethylene). This is because PTFE has a very low coefficient of friction. Since the first valve port 122 needs to be opened and closed frequently, low friction can reduce wear, allowing the second valve needle 130 to close the first valve port 122 more tightly and reducing the possibility of leakage. At the same time, low friction may also mean smoother operation and less driving force required, allowing the motor or actuator of the electronic expansion valve 10 to be designed to be smaller or more efficient. PTFE is extremely inert to most chemicals (including strong acids, strong alkalis, organic solvents, etc.) and can withstand corrosive refrigerants commonly found in refrigeration systems (such as R410A, R134a, etc.), avoiding valve leakage or failure due to material corrosion and extending service life. More importantly, PTFE has self-lubricating properties, which can significantly reduce friction and wear between the valve needle structure 100 and the sealing gasket 120. This helps reduce sealing failure caused by wear, ensuring the long-term airtightness of the second valve needle 130 under high-frequency opening and closing. The second valve needle 130 operates more smoothly, reducing the load on the motor or actuator and improving energy efficiency.

[0055] Optionally, in the second embodiment, the sealing gasket 120 is made of PP (polypropylene), because PP is inexpensive and can significantly reduce the production cost of the electronic expansion valve 10. Furthermore, glass fibers can be added to the PP to improve its creep resistance and dimensional stability.

[0056] Optionally, in the third embodiment, the sealing gasket 120 is made of PPS (polyphenylene sulfide), because PPS has excellent dimensional stability at high temperatures, avoiding valve port sealing failure due to thermal expansion. PPS has much higher tensile and flexural strength than PP and PTFE, and can withstand the high pressure of the refrigeration system. It exhibits almost no plastic deformation under long-term high pressure, ensuring a tight and consistent seal on the sealing surface of the first valve port 122 over a long period.

[0057] Optionally, in the fourth embodiment, the sealing gasket 120 is made of PEEK (polyetheretherketone). This is because its tensile and flexural strengths are close to those of aluminum, and its impact resistance far exceeds that of PPS and PTFE. It exhibits almost no deformation under high pressure and high temperature, ensuring the long-term sealing accuracy of the first valve port 122. More importantly, PEEK has a certain self-lubricating effect, which can significantly reduce frictional wear between the second valve needle 130 and the sealing gasket 120. This helps reduce seal failure caused by wear, ensuring the long-term airtightness of the second valve needle 130 under high-frequency opening and closing.

[0058] Furthermore, the sealing gasket 120 is also made of glass fiber or carbon fiber; that is, one of the materials of the sealing gasket 120 is PTFE, PP, PPS, or PEEK. The other material is glass fiber or carbon fiber. This is because the addition of glass fiber or carbon fiber significantly improves the tensile strength and tear resistance of the sealing gasket 120, preventing the sealing gasket 120 from breaking under high pressure or dynamic load. Moreover, under long-term pressure or high temperature, the deformation of the fiber-reinforced sealing gasket 120 is small, maintaining the stability of the sealing gasket 120. Secondly, the addition of glass fiber or carbon fiber can also significantly improve the temperature resistance of the sealing gasket 120. Of course, this solution is not limited to this; in other embodiments, the material of the sealing gasket 120 may also include only PTFE, PP, PPS, or PEEK.

[0059] Furthermore, the proportion of glass fiber or carbon fiber in the overall material of the sealing gasket 120 ranges from 10% to 30%. Specifically, the mass proportion of glass fiber or carbon fiber in the overall material ranges from 10% to 30%, that is, 10% ≤ w ≤ 30%. If w is greater than 30%, the mass proportion of glass fiber or carbon fiber will be too high. The rigid skeleton of glass fiber or carbon fiber will reduce the deformation capacity of the sealing gasket 120, resulting in reduced flexibility and thus a decrease in sealing effect. Moreover, a high proportion of glass fiber or carbon fiber will weaken the ductility of rubber, making it prone to cracking and propagation under alternating stress, shortening the service life of the sealing gasket 120. If w is less than 10%, the content of glass fiber or carbon fiber is relatively small, resulting in a weak reinforcing effect. This solution, by setting the mass proportion of glass fiber or carbon fiber in the overall material to 10% to 30%, can further improve the sealing performance, temperature resistance, and service life of the sealing gasket 120.

[0060] Reference Figure 1 and Figure 7In this embodiment, the electronic expansion valve 10 further includes a valve seat 200, which is provided with a second moving channel 210, a second valve port 220, and a peripheral connecting port 230. The second valve port 220 and the peripheral connecting port 230 are respectively connected to the second moving channel 210. The first valve needle 110 is movably disposed in the second moving channel 210 to open or close the second valve port 220. The number of peripheral connecting ports 230 is greater than or equal to 6, so that the total flow area of ​​the peripheral connecting ports 230 is greater than the flow area of ​​the second valve port 220.

[0061] Furthermore, the total flow area of ​​the peripheral connecting port 230 is greater than the flow area of ​​the second valve port 220. This helps to ensure that the amount of refrigerant flowing through the peripheral connecting port 230 is greater than the refrigerant flow rate flowing through the second valve port 220, thereby avoiding throttling.

[0062] It should be noted that the first valve port 122 is located on the end face of the first valve needle 110 that blocks the second valve port 220.

[0063] Furthermore, the diameter of the peripheral connecting port 230 is greater than or equal to 5 mm, which makes the total flow area of ​​the peripheral connecting port 230 greater than the flow area of ​​the second valve port 220.

[0064] Furthermore, a sealing ring is provided between the valve seat 200 and the first valve needle 110, which can improve the sealing performance between the valve seat 200 and the first valve needle 110.

[0065] In this embodiment, the outer peripheral surface of the first valve needle 110 is provided with an installation groove, the sealing ring is disposed in the installation groove and partially protrudes from the installation groove to abut against the valve seat 200, which can increase the installation stability of the sealing ring.

[0066] Optionally, the outer periphery of the second valve needle 130 is provided with a shoulder, which is used to abut against the side wall of the second moving channel 210 facing the first valve port 122, so that the second valve needle 130 drives the first valve needle 110 to move away from the second valve port 220, so as to open the second valve port 220.

[0067] Furthermore, in this embodiment, the valve seat 200 includes a connecting seat pressure sleeve, a connecting seat cylinder and a connecting seat, which are coaxially fixed together. The three are limited and tightly fitted and fixed together by laser welding. The peripheral communication port 230 and the second moving channel 210 are formed in the connecting seat cylinder, which facilitates the installation of the second valve needle 130.

[0068] The valve seat 200 also includes a valve port sealing gasket, which is fitted between the connecting seat cylinder and the connecting seat, and the second valve port 220 is formed on the valve port sealing gasket.

[0069] In this embodiment, the electronic expansion valve 10 further includes a housing disposed on the valve seat 200. The housing has a drive chamber, and a drive structure is disposed within the drive chamber. The drive structure is used to drive the valve needle structure 100 to operate. The second valve needle 130 has a balancing venting channel, which is connected to the drive chamber and the second valve port 220 respectively. The second valve needle 130 is movably disposed within the first moving channel 111 to open or close the first valve port 122, and drives the first valve needle 110 to open or close the second valve port 220. This solution utilizes the balancing venting channel to balance the pressure difference between the first valve needle 110 and the second valve needle 130 under different operating conditions, thereby improving and solving the problem that the first valve needle 110 and the second valve needle 130 are not easy to operate due to the pressure difference.

[0070] Furthermore, the second valve needle 130 has a mounting groove at the end away from the first valve port 122. The mounting groove is used for bearing installation, and the bearing is riveted and fixed in the mounting groove. This installation method can improve the installation stability of the bearing.

[0071] The drive structure includes a lead screw and a rotor for driving the lead screw. The bearing can rotate relative to the lead screw, and the bearing is slidably mounted on the lead screw.

[0072] The second valve needle 130 is provided with a clearance cavity that communicates with the mounting groove. The clearance cavity is located near the first valve port 122 and is used to avoid the lead screw. The cavity wall of the clearance cavity is provided with a vent hole that communicates with the balance venting channel.

[0073] This utility model also proposes an air conditioner, which includes an electronic expansion valve. The specific structure of the electronic expansion valve is as described in the above embodiments. Since this air conditioner 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.

[0074] This utility model also proposes an automobile, which includes an air conditioner. The specific structure of the air conditioner is as described in the above embodiments. Since this automobile 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.

[0075] 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 needle structure, the valve needle structure comprising: A first valve needle, the first valve needle having a first moving channel and a communication port connected to the first moving channel; A sealing gasket is disposed at the communication port. The sealing gasket has a first valve port communicating with the first moving channel. A crack-resistant groove is provided on the side wall of the sealing gasket facing the first moving channel. The crack-resistant groove is located around the periphery of the first valve port, and the first valve port penetrates the bottom of the crack-resistant groove to communicate with it. The second valve needle is movably disposed in the first moving channel to open or close the first valve port.

2. The electronic expansion valve as described in claim 1, characterized in that, The anti-crack settling tank includes a first tank section and a second tank section. The first tank section is connected to the first valve port through the second tank section, and the radius of the first tank section is greater than the radius of the second tank section.

3. The electronic expansion valve as described in claim 2, characterized in that, The second groove section is tapered in the direction near the first valve port.

4. The electronic expansion valve as described in claim 3, characterized in that, The first groove segment tapers towards the second groove segment.

5. The electronic expansion valve as described in claim 4, characterized in that, The cone angle of the second groove segment is greater than that of the first groove segment.

6. The electronic expansion valve as described in claim 2, characterized in that, The depth h of the first groove segment is in the range of 0.1mm≤h≤0.4mm.

7. The electronic expansion valve as described in claim 2, characterized in that, An abutting arc surface is provided between the second groove section and the first valve port, and the abutting arc surface is used to abut against the second valve needle.

8. The electronic expansion valve as described in any one of claims 1 to 7, characterized in that, The diameter R1 of the anti-crack settling tank is in the range of 3.5mm≤R1≤4.2mm.

9. The electronic expansion valve as described in claim 8, characterized in that, The ratio of the diameter R2 of the first valve port to the diameter R1 of the anti-crack settling tank is in the range of 0.5 to 0.

7.

10. The electronic expansion valve according to any one of claims 1 to 7, characterized in that, The sealing gasket is made of PTFE, PPS or PEEK.

11. The electronic expansion valve according to any one of claims 1 to 7, characterized in that, The electronic expansion valve also includes a valve seat, which has a second moving channel, a second valve port, and a peripheral communication port. The second valve port and the peripheral communication port are respectively connected to the second moving channel. The first valve needle is movably disposed in the second moving channel to open or close the second valve port.

12. The electronic expansion valve as described in claim 11, characterized in that, The total flow area of ​​the peripheral connecting port is greater than the flow area of ​​the second valve port; And / or, the number of the peripheral connecting ports is greater than or equal to 6; And / or, the diameter of the peripheral connecting port is greater than or equal to 5 mm.

13. An air conditioner, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 12.

14. A car, characterized in that, Including the air conditioner as described in claim 13.

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