Electronic expansion valve

Abstract

The utility model relates to refrigerating system technical field especially relates to an electronic expansion valve. Electronic expansion valve includes valve pipe, valve seat, valve core and sleeve, and sleeve is connected with valve seat, and is formed with valve cavity with sleeve cooperation, and the valve seat is opened with valve port, and the valve port is communicated with valve cavity, the valve core is arranged in sleeve and can move along the axial movement of sleeve, the sleeve is arranged on the outer circumferential side of valve core and is formed with first deceleration flow channel between valve core, and first deceleration flow channel is communicated with valve port, and the lateral wall of sleeve is also opened with at least one liquid outlet that communicates with valve cavity, and the liquid outlet is communicated with first deceleration flow channel, and the ratio P of the minimum flow area of first deceleration flow channel and the flow area of the flow passage formed between valve port and valve core satisfies: 0.5 <= P <= 2. Its advantage lies in, through first deceleration flow channel, and control its with valve port flow area ratio, effectively reduce the refrigerant flow rate, reduce medium reverse flow when fluid impact and valve core dither, thereby significantly inhibit throttling noise.

Description

Technical Field

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

[0002] An electronic expansion valve typically includes a valve body, a valve seat, and a valve core. Both the valve seat and the valve core are installed in the valve body. The valve seat has a valve port, and the valve core can move axially along the valve port. A flow port for the medium to pass through is formed between the valve core and the valve port, creating a throttling effect.

[0003] During the use of an electronic expansion valve, the refrigerant expands rapidly after passing through the valve port, causing the refrigerant flow rate to increase instantaneously. Furthermore, since the refrigerant is mostly in a gas-liquid two-phase state after being throttled through the valve port, the increased flow rate causes internal bubbles to burst abruptly, generating significant flow noise and greatly impacting the user experience. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an electronic expansion valve.

[0005] An electronic expansion valve includes: a valve tube; a valve seat assembly connected to the valve tube and cooperating with the valve tube to form a valve cavity, the valve seat assembly having a valve port communicating with the valve cavity; a valve core, at least partially located in the valve tube and movable along the axial direction of the valve tube, and capable of adjusting the flow rate of the valve port; a sleeve, at least partially installed in the valve cavity and sleeved on the outer periphery of the valve core, a first deceleration flow channel forming between the inner wall of the sleeve and the valve core, the first deceleration flow channel communicating with the valve cavity and the valve port respectively; wherein, the minimum flow area of ​​the first deceleration flow channel is S1, the flow area of ​​the valve port is S2, and the ratio P of S1 and S2 satisfies: 0.5≤P≤2.

[0006] With this configuration, the first deceleration channel has a smaller inner diameter and greater flow resistance compared to the valve cavity, thus reducing the refrigerant velocity after throttling at the valve port and consequently lowering noise. When the refrigerant flows in a different direction, the sleeve effectively prevents impact on the valve core, and the channel below the valve port then functions as the first deceleration channel. In other words, after the medium enters the valve cavity, it is first stopped by the sleeve, preventing direct impact on the valve core, thus preventing noise caused by valve core vibration and issues such as eccentricity caused by prolonged high-speed impact. Furthermore, limiting the ratio P of the minimum flow area S1 of the first deceleration channel to the flow area S2 of the valve port 21 to between 0.5 and 2 allows the first deceleration channel to maintain flow capacity while fully utilizing its throttling effect.

[0007] In one embodiment, the sleeve has an opening at its axial end near the valve tube, and the opening communicates with the first deceleration channel.

[0008] In one embodiment, the electronic expansion valve further includes a nut connected to the valve seat assembly, and the sleeve is spaced apart from the nut at its axial end near the valve tube.

[0009] In one embodiment, the electronic expansion valve further includes a nut connected to the valve seat assembly, the end of the sleeve having the open end abutting against the nut, and the sleeve having an outlet.

[0010] In one embodiment, the outlet is located on the outer peripheral wall of the sleeve near the opening.

[0011] In one embodiment, the sleeve includes a first section and a second section, the first section is connected to the second section, the first section abuts against the nut, the second section abuts against the valve seat assembly, both the first section and the second section are hollow, and the inner diameter of the second section is smaller than the inner diameter of the first section, the liquid outlet is opened on the first section, and the second section cooperates with the valve core to form the first deceleration flow channel.

[0012] In one embodiment, the nut includes a threaded section and a guide section, the guide section being located on the side of the threaded section near the valve port, the guide section and the valve core being guidedly engaged, at least a portion of the guide section being located within the first section, the valve seat assembly having a mounting groove, and the second section and the mounting groove being mutually restrictive engaged.

[0013] In one embodiment, at least two liquid outlets are provided, with the two liquid outlets located on opposite sides of the first segment.

[0014] In one embodiment, the liquid outlet is configured as a through-hole structure and / or a slotted structure.

[0015] In one embodiment, the total flow area of ​​the outlet is S3. When the valve core is in the fully open state, the valve core is not completely separated from the valve port. The minimum flow area formed between the outer periphery of the valve core and the valve port is S4, satisfying: S3 > S2, S1 > S4.

[0016] In one embodiment, the length of the first deceleration channel along the axial direction of the sleeve is H, and the inner diameter of the valve port is D, satisfying H≥1.5D.

[0017] In one embodiment, at least a portion of the inner wall of the sleeve is a cylindrical structure, and the first deceleration channel is an annular channel.

[0018] In one embodiment, the valve seat assembly is further provided with a second deceleration channel, which communicates with the valve port and extends from the valve port in a direction away from the valve cavity.

[0019] In one embodiment, the second deceleration channel includes a straight section with an inner diameter of D1 and an inner diameter of D of the valve port, satisfying 1≤D1 / D≤2.5; and / or the length of the straight section is H1, satisfying H1≥1.5D.

[0020] Compared to existing technologies, this invention forms a first deceleration channel between the sleeve and the valve core. After the medium is throttled through the valve port, it can achieve pressure reduction and deceleration through the first deceleration channel, avoiding the rapid collapse of air bubbles and the generation of noise. Furthermore, by controlling the ratio of the sleeve to the valve port flow area, the refrigerant flow rate is effectively reduced. When the medium flows in reverse, the sleeve can reduce fluid impact and valve core vibration, thereby significantly suppressing throttling noise and improving the operational stability and noise reduction effect of the electronic expansion valve. Attached Figure Description

[0021] Figure 1 A structural cross-sectional view of one embodiment of the electronic expansion valve provided by this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of section A in the image;

[0023] Figure 3 A schematic diagram of one embodiment of the sleeve provided by this utility model.

[0024] 100. Electronic expansion valve; 11. Valve tube; 12. Nut; 121. Threaded section; 122. Guide section; 13. Valve cavity; 20. Valve seat assembly; 21. Valve port; 22. Valve seat; 23. Mounting groove; 30. Valve core; 40. Sleeve; 41. Liquid outlet; 42. Opening; 43. First section; 44. Second section; 45. First deceleration channel; 46. Second deceleration channel; 50. Connecting pipe. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0030] This utility model provides an electronic expansion valve 100, which is provided with a sleeve 40 sleeved on the outside of the valve core 30. The sleeve 40 and the valve core 30 cooperate to form a first deceleration flow channel 45. The flow area of ​​the first deceleration flow channel 45 is optimized so that the medium is throttled after passing through the valve port 21, reducing the flow speed and preventing the rapid collapse of air bubbles in the medium, thereby reducing noise.

[0031] Please see Figures 1-3The electronic expansion valve 100 includes a valve tube 11, a valve seat assembly 20, a valve core 30, and a sleeve 40. The valve seat assembly 20 is connected to the valve tube 11 and cooperates with the valve tube 11 to form a valve cavity 13. The valve seat assembly 20 is provided with a valve port 21, which communicates with the valve cavity 13. The valve core 30 is at least partially located in the valve seat assembly 20 and can move along the axial direction of the electronic expansion valve 100 and can adjust the flow rate of the valve port 21. At least a portion of the sleeve 40 is installed in the valve cavity 13 and sleeved on the outer periphery of the valve core 30. A first deceleration flow channel 45 is formed between the inner wall of the sleeve 40 and the valve core 30. The first deceleration flow channel 45 communicates with the valve cavity 13 and the valve port 21 respectively. The minimum flow area of ​​the first deceleration flow channel 45 is S1, and the flow area of ​​the valve port 21 is S2. The ratio P of S1 and S2 satisfies: 0.5≤P≤2.

[0032] The electronic expansion valve 100 is a bidirectional flow valve. When the refrigerant flows from valve port 21 to valve chamber 13, the fluid is throttled at valve port 21 and then rapidly expands upon entering valve chamber 13, resulting in a high flow velocity. The throttled refrigerant is primarily a gas-liquid two-phase flow, and the bursting of air bubbles in this high-velocity gas-liquid two-phase flow can easily generate noise. Therefore, a first deceleration channel 45 is provided in valve chamber 13. This first deceleration channel 45 has a smaller inner diameter and greater flow resistance than valve chamber 13, thus reducing the refrigerant velocity after throttling at valve port 21 and consequently reducing noise. Compared to a deceleration structure downstream of valve chamber 13, the structure of this application can immediately slow down the refrigerant velocity after throttling at valve port 21. When the refrigerant flows in a different direction, that is, when the refrigerant flows from the valve cavity 13 to the valve port 21, the sleeve 40 has the technical effect of preventing the medium from impacting the valve core 30. At this time, the flow channel below the valve port 21 acts as the first deceleration flow channel 45.

[0033] In other words, when the medium flows in the reverse direction, after the medium enters the valve chamber 13, it will be stopped by the sleeve 40 to prevent the medium from directly impacting the valve core 30, thus preventing the valve core 30 from shaking and generating noise, as well as preventing the valve core 30 from being eccentric due to long-term high-speed impact of the medium.

[0034] In addition, by limiting the ratio P of the minimum flow area S1 of the first deceleration channel 45 to the flow area S2 of the valve port 21 to between 0.5 and 2, the first deceleration channel 45 can fully exert its deceleration effect while maintaining the flow capacity of the electronic expansion valve.

[0035] More preferably, the ratio P of S1 and S2 satisfies: 0.8≤P≤1.5. Within this range, the flow channel area ratio takes into account both noise reduction effect and flow area, and does not affect the medium flow efficiency while having sufficient noise reduction effect.

[0036] It should be explained that the minimum flow area S1 of the first deceleration channel 45 mentioned above refers to the difference between the minimum inner wall area of ​​the sleeve 40 and the cross-sectional area of ​​the valve core 30. When the diameter of the valve port 21 is D, the flow area S2 of the valve port 21 is πD² / 4.

[0037] Please see Figure 1 The starting point of the first deceleration flow channel 45 is the end of the sleeve 40. That is, when the valve core 30 is in the fully closed state, the starting point of the first deceleration flow channel 45 is the plane on the side of the valve seat assembly 20 where the valve port 21 is located.

[0038] Since the electronic expansion valve 100 can allow bidirectional flow of the medium, when the medium flows in the opposite direction, in order to ensure the deceleration and noise reduction effect of the medium, the valve seat assembly 20 is also provided with a second deceleration channel 46. The second deceleration channel 46 is connected to the valve port 21 and extends from the valve port 21 in a direction away from the valve cavity 13. In this way, after the medium is throttled through the valve port 21, it can be buffered and decelerated in the second deceleration channel 46, thereby preventing excessive noise.

[0039] Furthermore, the second deceleration channel 46 includes a straight section with an inner diameter of D1 and an inner diameter of D of the valve port 21, satisfying 1≤D1 / D≤2.5; and / or, the length of the straight section is H1, satisfying H1≥1.5D. This ensures that the fluid, after being throttled through the valve port 21, can be sufficiently expanded and buffered in the second deceleration channel 46, effectively reducing the refrigerant velocity, reducing noise generated by bubble bursting, while maintaining the flow capacity of the channel and avoiding pressure loss caused by excessive throttling, thereby improving the noise reduction performance and operational stability of the electronic expansion valve.

[0040] In this embodiment, the valve seat assembly 20 includes a valve seat 22, on which a valve port 21 is provided. The valve core 30 cooperates with the valve port 21 to regulate the flow rate. It can be understood that in other embodiments, the valve seat assembly may also include a valve seat core (not shown in the figure). The valve seat core and the valve seat 22 are separately disposed, and the valve seat core is disposed on the radially inner side of the valve seat 22. The valve port 21 is provided on the valve seat core. The separate structure facilitates processing and disassembly.

[0041] A nut 12 is also connected to the valve seat 22. The nut 12 is located on the side of the valve seat 22 close to the valve tube 11. The nut 12 cooperates with the valve core 30. At least part of the valve core 30 passes through the nut 12 and is coaxially arranged with the nut 12. It can move along the axial direction of the nut 12 and cooperate with the valve port 21 to achieve flow regulation.

[0042] The outlet 41 can be implemented in various ways. Specifically, in this embodiment, the sleeve 40 forms an opening 42 near the axial end of the valve tube 11, and the opening 42 is connected to the first deceleration channel 45. In this way, the medium can also enter the valve cavity 13 through the opening 42, reducing flow resistance, further helping to reduce noise, and improving the uniformity of fluid distribution.

[0043] In one embodiment, the axial end of the sleeve 40 near the valve tube 11 is spaced apart from the nut 12. Thus, the opening 42 communicates with the valve cavity 13, allowing the medium to enter smoothly. In this embodiment, the sleeve 40 can be fixed to the valve seat assembly 20 by welding or other means.

[0044] In another embodiment, the sleeve 40 near the axial end of the valve tube 11, i.e. the end with the opening 42, abuts against the nut 12. Thus, the opening 42 closes after abutting against the nut 12, and at least one additional liquid outlet 41 is opened on the side wall of the sleeve 40, through which the medium can only enter the valve chamber 13 from inside the sleeve 40.

[0045] Furthermore, the outlet 41 is located at the end of the sleeve 40 near the opening 42, thereby ensuring that the length of the first deceleration channel 45 is sufficiently long to ensure the deceleration effect on the medium. Even when the medium flows out of the first deceleration channel 45, because the outlet 41 is located near the top, the medium can still receive sufficient deceleration within the sleeve 40.

[0046] Furthermore, the nut 12 includes a threaded section 121 and a guide section 122. The guide section 122 is located on the side of the threaded section 121 near the valve port 21. The guide section 122 and the valve core 30 are guidedly engaged. At least a portion of the guide section 122 is located within the first section 43. The valve seat assembly 20 has a mounting groove 23, and the second section 44 is in a limiting engagement with the mounting groove 23. The mounting groove 23 facilitates the fixation of the sleeve 40, enabling the sleeve 40 to be confined to a preset position.

[0047] As set above, the sleeve 40 and valve pipe 11 are designed to be either in contact or spaced apart to adapt to different assembly requirements, while maintaining the stability of the first deceleration flow channel 45, ensuring that noise reduction function can be effectively achieved under different installation conditions.

[0048] Furthermore, when the sleeve 40 abuts against the nut 12, the nut 12 can be fixedly connected to the valve seat assembly 20 through the nut connecting plate, thereby further fixing the sleeve 40 and the valve seat assembly 20. This reduces one welding process for the sleeve 40, and the position can be fixed simply by abutting against the nut 12.

[0049] Furthermore, the liquid outlet 41 on the sleeve 40 can be implemented in various ways. In one embodiment, the liquid outlet 41 is configured as a slotted structure and is located at the end of the sleeve 40 that forms the opening 42, such as... Figure 3 As shown.

[0050] In another embodiment, the outlet 41 is configured as a through hole structure, located on the side wall of the sleeve 40, and spaced apart from the end of the sleeve 40 near the valve tube 11.

[0051] Furthermore, the sleeve 40 includes a first section 43 and a second section 44, which are connected. The first section 43 abuts against the nut 12, and the second section 44 abuts against the valve seat 22. Both the first section 43 and the second section 44 are hollow, and the inner diameter of the second section 44 is smaller than that of the first section 43. The outlet 41 is located on the first section 43, and the second section 44 cooperates with the valve core 30 to form a first deceleration channel 45. In this way, the first section 43 abuts against the nut 12 and has an outlet 41, while the second section 44 abuts against the valve seat 22 and has a smaller inner diameter, forming a stepped structure. This optimizes the fluid path, allowing the fluid to first pass through the slender first deceleration channel 45, then enter the wider first section 43, where it is adequately buffered before flowing out of the outlet 41, thus enhancing the noise reduction effect.

[0052] For example, the liquid outlet 41 is configured as a circular hole structure, and there are at least two liquid outlets 41, which are opened on opposite sides of the first section 43. In this way, the liquid outlets 41 adopt a circular hole structure and are symmetrically arranged on both sides of the first section 43, so that the fluid flows out of the sleeve 40 evenly, avoiding local impact and eddies, further reducing noise generation, and improving flow stability.

[0053] In another embodiment, the liquid outlet 41 is configured with a slotted structure and is located at the top of the first segment 43 near the valve core 30 assembly. At least two liquid outlets 41 are provided, with two outlets 41 located on opposite sides of the first segment 43. Thus, the slotted structure of the liquid outlets 41, located at the top of the first segment 43 and symmetrically arranged, provides a larger flow area while preventing direct impact on the valve core 30 during refrigerant reversal flow, effectively reducing vibration noise.

[0054] Understandably, the liquid outlet 41 can also be configured in other shapes, such as a rectangular opening, a polygonal opening, etc., as long as it can meet the function of liquid inlet, and is not limited to the above embodiments. The above configuration is only a preferred solution with better technical effect.

[0055] Preferably, in this embodiment, the inner wall of the second segment 44 is configured as a cylindrical structure, and the inner wall of the second segment 44 and the valve core 30 cooperate to form an annular first deceleration channel 45. In this way, the inner wall of the second segment 44 is designed as a cylindrical structure with a constant inner diameter, which cooperates with the valve core 30 to form an annular first deceleration channel 45, so that the fluid flows along a uniform annular path, enhancing the noise reduction effect and improving the reliability and consistency of the channel.

[0056] To ensure the deceleration effect of the annular flow channel, its structure is further optimized. Along the axial direction of the sleeve 40, the length of the first deceleration flow channel 45 is H, and the inner diameter of the valve port 21 is D, satisfying H≥1.5D. In this way, by limiting the ratio of the length H of the first deceleration flow channel 45 to the inner diameter D of the valve port 21, the flow channel is ensured to be long enough to fully decelerate the fluid.

[0057] Preferably, in this embodiment, the total flow area S3 of the outlet 41 (multiple outlets 41 can be provided, which will be elaborated below) needs to be greater than the flow area S2 of the valve port 21, and the minimum flow area S1 of the first deceleration channel 45 is greater than the minimum flow port area S4 formed between the outer periphery of the valve core 30 and the valve port 21 when the valve core 30 is fully open. That is, the flow area between the valve core 30 and the valve port 21 means that the valve core 30 is always partially located in the valve port 21 and will not completely leave the valve port 21. With the above settings, the throttling position can always occur at the valve port 21.

[0058] A connecting pipe 50 is connected to the valve seat 22, communicating with an external flow path. The axis of the connecting pipe 50 is perpendicular to the axis of the valve port 21. The connection of the connecting pipe 50 to the valve seat 22 with its axis perpendicular to the axis of the valve port 21 optimizes the connection between the external flow path and the valve port 21, reducing turbulence and impact during fluid turning, and helping to reduce overall noise.

[0059] Compared to existing technologies, this invention forms a first deceleration channel 45 between the sleeve 40 and the valve core 30. After the medium passes through the valve port 21 for throttling, it can be decelerated by the first deceleration channel 45, preventing the rapid bursting of air bubbles and the generation of noise. By controlling the ratio of its flow area to that of the valve port 21, the refrigerant flow rate is effectively reduced. When the medium flows in reverse, the sleeve 40 can reduce fluid impact and valve core vibration, thereby significantly suppressing throttling noise and improving the operational stability and noise reduction effect of the electronic expansion valve 100.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that, include: Valve tube (11); A valve seat assembly (20) is connected to the valve tube (11) and cooperates with the valve tube (11) to form a valve cavity (13). The valve seat assembly (20) is provided with a valve port (21), and the valve port (21) communicates with the valve cavity (13). The valve core (30) is at least partially located in the valve seat assembly (20) and is axially movable along the electronic expansion valve and is capable of regulating the flow rate of the valve port (21); A sleeve (40), at least a portion of which is installed in the valve cavity (13) and sleeved on the outer periphery of the valve core (30), forms a first deceleration channel (45) between the inner wall of the sleeve (40) and the valve core (30), and the first deceleration channel (45) is connected to the valve cavity (13) and the valve port (21) respectively. The minimum flow area of ​​the first deceleration channel (45) is S1, the flow area of ​​the valve port (21) is S2, and the ratio P of S1 and S2 satisfies: 0.5≤P≤2.

2. The electronic expansion valve according to claim 1, characterized in that, The sleeve (40) has an opening (42) at its axial end near the valve tube (11), and the opening (42) is connected to the first deceleration channel (45).

3. The electronic expansion valve according to claim 2, characterized in that, The electronic expansion valve also includes a nut (12) connected to the valve seat assembly (20), and the sleeve (40) is spaced apart from the nut (12) at the axial end near the valve tube (11).

4. The electronic expansion valve according to claim 2, characterized in that, The electronic expansion valve also includes a nut (12), which is connected to the valve seat assembly (20). The end of the sleeve (40) with the opening (42) abuts against the nut (12), and the sleeve (40) has an outlet (41).

5. The electronic expansion valve according to claim 4, characterized in that, The outlet (41) is located on the outer peripheral wall of the sleeve (40) near the opening (42).

6. The electronic expansion valve according to claim 4, characterized in that, The sleeve (40) includes a first section (43) and a second section (44). The first section (43) is connected to the second section (44). The first section (43) abuts against the nut (12). The second section (44) abuts against the valve seat assembly (20). Both the first section (43) and the second section (44) are hollow. The inner diameter of the second section (44) is smaller than the inner diameter of the first section (43). The liquid outlet (41) is opened on the first section (43). The second section (44) cooperates with the valve core (30) to form the first deceleration flow channel (45).

7. The electronic expansion valve according to claim 6, characterized in that, The nut (12) includes a threaded section (121) and a guide section (122). The guide section (122) is located on the side of the threaded section (121) near the valve port (21). The guide section (122) and the valve core (30) are guidedly engaged. At least part of the guide section (122) is located within the first section (43). The valve seat assembly (20) has a mounting groove (23). The second section (44) and the mounting groove (23) are mutually limitingly engaged.

8. The electronic expansion valve according to claim 6, characterized in that, The liquid outlet (41) is configured to be at least two, and the two liquid outlets (41) are opened on opposite sides of the first segment (43).

9. The electronic expansion valve according to claim 4, characterized in that, The liquid outlet (41) is configured as a through hole structure and / or a slotted structure.

10. The electronic expansion valve according to claim 4, characterized in that, The total flow area of ​​the outlet (41) is S3. When the valve core (30) is in the fully open state, the valve core (30) is not completely separated from the valve port (21). The minimum flow area formed between the outer periphery of the valve core (30) and the valve port (21) is S4, which satisfies: S3 > S2, S1 > S4.

11. The electronic expansion valve according to claim 1, characterized in that, Along the axial direction of the sleeve (40), the length of the first deceleration channel (45) is H, and the inner diameter of the valve port (21) is D, satisfying H≥1.5D.

12. The electronic expansion valve according to claim 1, characterized in that, At least part of the inner wall of the sleeve (40) is cylindrical, and the first deceleration channel (45) is an annular channel.

13. The electronic expansion valve according to claim 1, characterized in that, The valve seat assembly (20) is also provided with a second deceleration channel (46), which is connected to the valve port (21) and extends from the valve port (21) in a direction away from the valve cavity (13).

14. The electronic expansion valve according to claim 13, characterized in that, The second deceleration channel (46) includes a straight section with an inner diameter of D1 and an inner diameter of D of the valve port (21), satisfying that 1≤D1 / D≤2.5; and / or the length of the straight section is H1, satisfying that H1≥1.5D.

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