Electronic expansion valve and refrigeration apparatus

Abstract

The utility model discloses an electronic expansion valve and refrigeration plant relates to fluid control component technical field, wherein, electronic expansion valve includes valve seat and flow guide sleeve, valve seat has valve cavity, and the lateral wall of valve seat is provided with the first refrigerant delivery pipe that communicates with valve cavity, flow guide sleeve is connected in valve seat, and at least partial is located in valve cavity, and flow guide sleeve or valve seat is seted up with the valve port that penetrates valve seat, and the valve port is communicated in flow guide sleeve, and the lateral wall of flow guide sleeve is opposite with the first refrigerant delivery pipe in the radial direction of electronic expansion valve, and the lateral wall of flow guide sleeve is provided with flow guide hole, and flow guide hole is not set up with the first refrigerant delivery pipe directly opposite, wherein, the total area of flow guide hole is S1, and the area of valve port is S2, satisfy: the utility model provides technical scheme to reduce the probability that valve needle occurs deflection, to guarantee the clearance uniformity that valve needle opens and closes valve port, reduce refrigerant noise.

Description

Technical Field

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

[0002] Electronic expansion valves, as key flow regulation components in refrigeration and heat pump systems, are widely used in air conditioners, refrigerators, heat pump water heaters, and other equipment. Their main function is to precisely regulate the refrigerant flow according to system load requirements. An electronic expansion valve typically includes a valve seat and a valve needle. The valve seat has a refrigerant delivery pipe radially opposite to the valve needle and a valve port axially opposite to the valve needle. The valve needle is slidably mounted within the valve seat.

[0003] However, when the refrigerant flows into the valve seat from the refrigerant delivery pipe, the refrigerant can easily impact the valve needle located in the valve seat from the side, causing the valve needle to deviate or vibrate during the sliding process, which can disrupt the concentricity between the valve needle and the valve port. It may also cause local unevenness in the fit clearance between the valve needle and the valve port, resulting in a large amount of refrigerant noise when the refrigerant flows through the valve port. Utility Model Content

[0004] The main purpose of this invention is to propose an electronic expansion valve and refrigeration equipment, which aims to reduce the probability of valve needle deflection, so as to ensure the uniformity of the gap between the valve needle opening and closing the valve orifice and reduce refrigerant noise.

[0005] To achieve the above objectives, the electronic expansion valve proposed in this utility model includes: A valve seat, the valve seat having a valve cavity, and a first refrigerant delivery pipe communicating with the valve cavity is provided on the side wall of the valve seat; and A flow guide sleeve is connected to the valve seat and is at least partially located in the valve cavity. The flow guide sleeve or the valve seat has a valve port that penetrates the valve seat and communicates with the inside of the flow guide sleeve. The side wall of the flow guide sleeve is opposite to the first refrigerant delivery pipe in the radial direction of the electronic expansion valve. The side wall of the flow guide sleeve is provided with a flow guide hole, which is not directly opposite to the first refrigerant delivery pipe. Wherein, the total area of ​​the guide holes is S1, and the area of ​​the valve port is S2, satisfying: .

[0006] In one embodiment, the flow guide hole and the first refrigerant delivery pipe are offset in the axial direction of the electronic expansion valve, with the flow guide hole located adjacent to the valve port.

[0007] In one embodiment, along the axial direction of the electronic expansion valve, the distance from the central axis of the guide hole to the valve port is L1, and the distance from the central axis of the first refrigerant delivery pipe to the valve port is L2, satisfying: .

[0008] In one embodiment, the flow guide sleeve is provided with a plurality of flow guide holes, and the flow guide holes and the first refrigerant delivery pipe are staggered in the circumferential direction of the flow guide sleeve.

[0009] In one embodiment, on the axial projection plane of the electronic expansion valve, the angle between the central axis of the guide hole located adjacent to the first refrigerant delivery pipe and the central axis of the first refrigerant delivery pipe is α, satisfying: .

[0010] In one embodiment, the flow guide sleeve includes a valve seat and a body portion. The valve seat has an installation port, the valve seat is installed in the installation port, the flow guide hole is disposed in the body portion, and the valve port is disposed in the valve seat.

[0011] In one embodiment, the valve seat and the body are integrally formed or separately disposed; In one embodiment, the electronic expansion valve further includes a second refrigerant delivery pipe, and the valve seat includes a connecting portion protruding from the mounting port, with the second refrigerant delivery pipe sleeved on the connecting portion.

[0012] In one embodiment, in the axial direction of the electronic expansion valve, the guide sleeve extends from the valve port toward the valve cavity at a height of L3, and the distance from the central axis of the first refrigerant delivery pipe to the valve port is L2, satisfying: .

[0013] In one embodiment, the electronic expansion valve further includes a nut connected to the valve seat to enclose and form the valve cavity. The end of the nut opposite the valve port has a mounting protrusion, and the end of the flow guide sleeve away from the valve port is fitted onto the mounting protrusion.

[0014] This utility model also proposes a refrigeration device, which includes the aforementioned electronic expansion valve.

[0015] The technical solution of this utility model involves setting a flow guide sleeve on the valve seat. The flow guide sleeve extends at least partially into the valve cavity and is radially opposite to the first refrigerant delivery pipe of the electronic expansion valve. The valve port is connected to the interior of the flow guide sleeve. A flow guide hole is formed on the side wall of the flow guide sleeve, and the flow guide hole is not directly opposite the first refrigerant delivery pipe, but rather staggered. In this way, the high-speed refrigerant entering the valve cavity from the first refrigerant delivery pipe first impacts the side wall of the flow guide sleeve, then flows along the side wall through the flow guide hole into the flow guide sleeve, and finally flows out from the valve port. This avoids the high-speed refrigerant entering from the first refrigerant delivery pipe directly impacting the valve needle located at the center of the valve cavity, reducing the probability of valve needle deflection. Simultaneously, when… When it is difficult to ensure that the valve port is the smallest width channel within the electronic expansion valve, the guide hole can easily interfere with the valve needle's adjustment of the valve port opening, affecting the electronic expansion valve's ability to accurately regulate the refrigerant flow; and when At this time, the diameter of the guide hole is easily too large, which may result in an excessively large radial proportion between the guide hole and the first refrigerant delivery pipe. This causes most of the refrigerant entering the valve cavity from the first refrigerant delivery pipe to still pass directly through the guide hole and impact the valve core, causing valve core sliding eccentricity. Therefore, by controlling the total area S1 of the guide hole and the area S2 of the valve port to satisfy... The proportional relationship ensures that the refrigerant entering from the first refrigerant delivery pipe is first blocked by the guide sleeve, and then flows smoothly into the interior of the guide sleeve through the guide holes that are not directly opposite to the first refrigerant delivery pipe, and finally flows out through the valve port. This avoids the high-speed refrigerant entering from the first refrigerant delivery pipe directly impacting the peripheral wall of the valve needle, reducing the radial impact force on the valve needle. As a result, the valve needle can always maintain good concentricity when sliding along the axial direction, and the fit gap between it and the valve port is uniform. This improves the linearity and repeatability of the valve needle in flow regulation, and effectively suppresses refrigerant turbulence and high-frequency noise caused by uneven gaps. Attached Figure Description

[0016] 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.

[0017] Figure 1 A cross-sectional view of an embodiment of the electronic expansion valve provided by this utility model; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 Schematic diagram of the structure of the middle guide sleeve; Figure 4 for Figure 3 Cross-sectional view of the middle guide sleeve.

[0018] Explanation of icon numbers: 100, Valve seat; 110, Valve cavity; 120, Mounting port; 200, Flow guide sleeve; 210, Body part; 211, Flow guide hole; 220, Valve port seat; 221, Valve port; 230, Connecting part; 302, Second refrigerant delivery pipe; 301, First refrigerant delivery pipe; 400, Nut; 410, Mounting protrusion; 500, Valve needle.

[0019] 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

[0020] 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.

[0021] 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.

[0022] 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.

[0023] This utility model proposes an electronic expansion valve.

[0024] Please refer to Figure 1 , Figure 2 and Figure 4 In one embodiment of this utility model, the electronic expansion valve includes: Valve seat 100, the valve seat 100 having a valve cavity 110, and a first refrigerant delivery pipe 301 communicating with the valve cavity 110 is provided on the side wall of the valve seat 100; and A flow guide sleeve 200 is connected to the valve seat 100 and is at least partially located in the valve cavity 110. The flow guide sleeve 200 or the valve seat 100 has a valve port 221 that penetrates the valve seat 100. The valve port 221 communicates with the inside of the flow guide sleeve 200. The side wall of the flow guide sleeve 200 is radially opposite to the first refrigerant delivery pipe 301 of the electronic expansion valve. The side wall of the flow guide sleeve 200 is provided with a flow guide hole 211, which is not directly opposite to the first refrigerant delivery pipe 301. Wherein, the total area of ​​the guide hole 211 is S1, and the area of ​​the valve port 221 is S2, satisfying: .

[0025] It should be noted that the electronic expansion valve includes a valve needle 500, which is movably inserted into the valve seat 100 and opens and closes the valve port 221 along the axial direction of the electronic expansion valve via the guide sleeve 200. The valve needle 500 extends along the axial direction of the electronic expansion valve, with the end of the valve needle 500 and the valve port 221 facing each other in the axial direction of the electronic expansion valve. The first refrigerant delivery pipe 301 is radially opposite to the circumference of the valve needle 500 in the electronic expansion valve.

[0026] The technical solution of this utility model involves setting a guide sleeve 200 on the valve seat 100. The guide sleeve 200 extends at least partially into the valve cavity 110 and is radially opposite to the first refrigerant delivery pipe 301 of the electronic expansion valve. The valve port 221 communicates with the guide sleeve 200 axially with the electronic expansion valve. A guide hole 211 is provided on the side wall of the guide sleeve 200. The guide hole 211 is not directly opposite the first refrigerant delivery pipe 301, but is misaligned. Thus, the high-speed refrigerant entering the valve cavity 110 from the first refrigerant delivery pipe 301 first impacts the side wall of the guide sleeve 200, then flows along the side wall of the guide sleeve 200 through the guide hole 211 into the guide sleeve 200, and then flows out from the valve port 221. This avoids the high-speed refrigerant entering from the first refrigerant delivery pipe 301 directly impacting the valve needle 500 located at the center of the valve cavity 110, reducing the probability of the valve needle 500 deflecting. Simultaneously, when… When it is difficult to ensure that valve port 221 is the smallest width channel within the electronic expansion valve, the guide hole 211 may easily interfere with the valve needle 500 adjusting the opening of valve port 221, affecting the electronic expansion valve's ability to accurately regulate refrigerant flow; and when At this time, the diameter of the guide hole 211 may be too large, resulting in an excessively large radial proportion between the guide hole 211 and the first refrigerant delivery pipe 301. This causes most of the refrigerant entering the valve chamber 110 from the first refrigerant delivery pipe 301 to still directly pass through the guide hole 211 and impact the valve core, causing valve core sliding eccentricity. Therefore, by controlling the total area S1 of the guide hole 211 and the area S2 of the valve port 221 to satisfy... The proportional relationship ensures that the refrigerant entering from the first refrigerant delivery pipe 301 is first blocked by the guide sleeve 200, and then flows smoothly into the interior of the guide sleeve 200 through the guide holes 211 that are not directly opposite to the first refrigerant delivery pipe 301, and finally flows out through the valve port 221. This avoids the high-speed refrigerant entering from the first refrigerant delivery pipe 301 directly impacting the peripheral wall of the valve needle 500, reducing the radial impact force on the valve needle 500. As a result, the valve needle 500 can always maintain good concentricity when sliding along the axial direction, and the fit gap between it and the valve port 221 is uniform. This improves the linearity and repeatability of the flow regulation of the valve needle 500, and effectively suppresses refrigerant turbulence and high-frequency noise caused by uneven gaps.

[0027] In this configuration, the opening direction of the first refrigerant delivery pipe 301 connecting to the valve chamber 110 is perpendicular or nearly perpendicular to the valve needle 500 in the radial direction of the electronic expansion valve. The guide hole 211 is not directly opposite the first refrigerant delivery pipe 301. This can be understood as follows: taking the pipe section of the first refrigerant delivery pipe 301 connecting to the valve chamber 110 as a reference, on the projection plane along the central axis of the first refrigerant delivery pipe 301, the guide hole 211 adjacent to the first refrigerant delivery pipe does not have a portion overlapping with the first refrigerant delivery pipe 301, or the overlapping portion accounts for no more than half of the guide hole 211. Thus, the refrigerant entering from the first refrigerant delivery pipe 301, during the buffering process of the outer wall of the guide sleeve 200, is also guided by the outer wall of the guide sleeve 200, and then guided into the guide sleeve 200 from the guide hole 211, thereby reducing the flow rate of the refrigerant impacting the valve needle 500. Furthermore, the guide hole 211 can be inclined from the first refrigerant delivery pipe 301 toward the valve port 221, so that the flow direction of the refrigerant entering the guide sleeve 200 from the guide hole 211 is close to the valve port 221, reducing the probability of the refrigerant impacting the valve needle 500 radially. Simultaneously, multiple guide holes 211 can be provided to guide the refrigerant to enter the guide sleeve 200 evenly in the circumference, further reducing the probability of the valve needle 500 sliding eccentrically due to the refrigerant's influence. In addition, when multiple guide holes 211 are provided in the guide sleeve 200, the diameter of the guide holes 211 at different positions can be the same or different. For example, in the direction away from the valve port 221, the diameter of different guide holes 211 shows a gradually increasing trend, further reducing the refrigerant flow velocity into the guide sleeve 200. It is understandable that... Specifically, the values ​​can be 1.3, 1.5, 1.8, 2, 3, 4, 5, 5.5, etc., and the units for S1 and S2 are mm. 2 .

[0028] In one embodiment, please refer to Figures 2 to 4The guide hole 211 and the first refrigerant delivery pipe 301 are offset along the axial direction of the electronic expansion valve, with the guide hole 211 located near the valve port 221. It can be understood that, with the central axis of the first refrigerant delivery pipe 301 and the guide hole 211 as a reference, the guide hole 211 is located between the central axis of the first refrigerant delivery pipe 301 and the valve port 221. Therefore, the refrigerant entering the valve cavity 110 from the first refrigerant delivery pipe 301, after being blocked by the guide sleeve 200, can quickly flow into the guide sleeve 200 through the guide hole 211 near the valve port 221, and then flow out from the valve port 221. This shortens the refrigerant's stagnation path in the valve cavity 110, preventing the formation of eddies or localized high-pressure areas around the valve needle 500, thereby further reducing the lateral impact force on the valve needle 500. Meanwhile, since the guide hole 211 is adjacent to the valve port 221, the refrigerant can flow out smoothly along the axial direction immediately after passing through the guide hole 211, and the flow direction is more concentrated and stable, which not only improves the flow efficiency, but also reduces vibration and noise caused by abrupt changes in the flow channel or flow separation. Of course, in other embodiments, the guide hole 211 can also be set further away from the valve port 221 in the axial direction of the electronic expansion valve than the first refrigerant delivery pipe 301.

[0029] Furthermore, in this embodiment, please refer to Figure 2 As shown in Figure 4, along the axial direction of the electronic expansion valve, the distance from the central axis of the guide hole 211 to the valve port 221 is L1, and the distance from the central axis of the first refrigerant delivery pipe 301 to the valve port 221 is L2, satisfying the following: It should be noted that the values ​​of L1 and L2 are determined by the following: the starting point of L1 is the position of valve port 221 on the side wall of valve cavity 110; the ending point of L1 is the position where the central axis of guide hole 211 intersects with the outer wall of guide sleeve 200; and the ending point of L2 is the position where the central axis of first refrigerant delivery pipe 301 intersects with the cavity wall of valve cavity 110. The guide hole 211 is positioned axially closer to the valve port 221 than the first refrigerant delivery pipe 301. This allows the refrigerant entering the valve cavity 110 from the first refrigerant delivery pipe 301 to be preferentially guided into the guide sleeve 200 by the guide hole 211, which is closer to the valve port 221, before flowing towards the central region of the valve cavity 110. The refrigerant is then quickly discharged through the valve port 221, effectively preventing refrigerant from stagnating around the valve needle 500 or directly impacting its sidewalls. Simultaneously, it reduces the lateral disturbance of the refrigerant on the valve needle 500, helping to maintain the concentricity of the valve needle 500 during sliding and preventing uneven valve port clearance due to eccentricity. In this embodiment, the axial positional relationship, along with the ratio of the total area S1 of the guide hole 211 to the total area S2 of the valve port 221, synergistically optimizes the flow field distribution inside the valve cavity 110, improving flow regulation stability while suppressing high-frequency noise caused by refrigerant turbulence or flow deviation. Wherein, L1 and L2 are in mm. Regarding the relationship between L1 and L2, the first refrigerant delivery pipe 301 and the guide hole 211 are partially opposite each other in the radial direction; or, there is no radially opposite part, that is, the guide hole 211 is completely located in the area of ​​the first refrigerant delivery pipe 301 near the valve port 221. Of course, in other embodiments, the central axis of the guide hole 211 forms an acute angle with the axial direction of the guide sleeve 200, and the central axis of the first refrigerant delivery pipe 301 is perpendicular to the axial direction of the guide sleeve 200, then L2 can be equal to or slightly larger than L1.

[0030] In one embodiment, please refer to Figure 1 and Figure 2 The guide sleeve 200 is provided with multiple guide holes 211, which are staggered circumferentially distributed with the first refrigerant delivery pipe 301. It can be understood that the circumferential position of the guide holes 211 avoids the area directly opposite the first refrigerant delivery pipe 301, so that the refrigerant entering the valve cavity 110 radially from the first refrigerant delivery pipe 301 cannot directly pass through the guide holes 211 and act on the valve needle 500. Instead, it is first blocked by the outer wall of the guide sleeve 200, and then flows along the inner wall of the valve cavity 110 under the drive of the circumferential pressure gradient. Subsequently, it is smoothly guided into the interior of the guide sleeve 200 through the circumferentially staggered guide holes 211, and finally flows out axially through the valve port 221. In this way, the inflow direction of the refrigerant is effectively dispersed, avoiding localized concentrated impacts and weakening the asymmetric fluid load acting on the valve needle 500. This ensures that the valve needle 500 maintains good concentricity during axial sliding, preventing uneven valve port sealing gaps caused by eccentricity. Of course, in other embodiments, the guide hole 211 does not extend radially along the guide sleeve 200. When the openings of the inner and outer walls of the guide sleeve 200 with the guide hole 211 are misaligned radially in the guide sleeve 200, the opening of the guide hole 211 on the outer wall of the guide sleeve 200 can also be arranged opposite to the first refrigerant delivery pipe 301.

[0031] Furthermore, in this embodiment, please refer to Figure 1 and Figure 2 On the axial projection plane of the electronic expansion valve, the angle between the central axis of the guide hole 211 adjacent to the first refrigerant delivery pipe 301 and the central axis of the first refrigerant delivery pipe 301 is α, satisfying: It is understandable that α ensures that the guide hole 211 maintains a sufficient offset distance from the first refrigerant delivery pipe 301 in the circumferential direction, effectively preventing the refrigerant flowing in at high speed from the first refrigerant delivery pipe 301 from directly passing through the guide hole 211 and impacting the side wall of the valve needle 500. When α is less than 10°, the guide hole 211 and the first refrigerant delivery pipe 301 are too close in the circumferential position, and the refrigerant flow may still act on the valve needle 500 along a straight path, causing eccentricity or vibration; while when α is less than 10°, the guide hole 211 and the first refrigerant delivery pipe 301 are too close in the circumferential position, and the refrigerant flow may still act on the valve needle 500 along a straight path, resulting in eccentricity or vibration; while when α is less than 10°, the guide hole 211 and the first refrigerant delivery pipe 301 are too close in the circumferential direction .... When the refrigerant enters the valve chamber 110, it must bypass the solid part of the guide sleeve 200 and deflect at a certain angle in the circumferential direction before entering the guide hole 211. The flow path is significantly extended and buffered, and the fluid kinetic energy is effectively attenuated. This strengthens the protection of the valve needle 500 and maintains its concentricity during the sliding process.

[0032] In one embodiment, please refer to Figures 2 to 4 The flow guide sleeve 200 includes a valve seat 220 and a body 210. The valve seat 100 has an installation port 120, and the valve seat 220 is installed in the installation port 120. A flow guide hole 211 is provided in the body 210, and the valve port 221 is provided in the valve seat 220. It can be understood that the boundary between the body 210 and the valve seat 220 is flush with the cavity wall of the valve cavity 110. The valve seat 220 forms the valve port 221, which is the axial main flow channel, ensuring the stability and sealing reliability of the refrigerant outflow path. The body 210 performs the flow guiding function, and its flow guide hole 211 guides the refrigerant entering from the first refrigerant delivery pipe 301 to bypass the valve needle 500 and flow into the valve port 221. This facilitates the processing and assembly of the flow guide sleeve 200. Simultaneously, the valve seat 220 is embedded in the installation port 120 of the valve seat 100, which helps improve the processing accuracy and surface quality of the valve port 221. Of course, in other embodiments, the valve port 221 may be formed on the valve seat 100, and the side wall end of the flow guide sleeve 200 may be arranged around the periphery of the valve port 221 and fixedly connected to the cavity wall of the valve cavity 110.

[0033] In this embodiment, the valve seat 220 and the body 210 are either integrally formed or separately configured. When integrally formed, the valve seat 220 and the body 210 have high overall structural rigidity and good coaxiality, which helps ensure the relative positional accuracy between the valve port 221 and the guide hole 211, thereby improving the consistency of the refrigerant flow path, reducing flow field disturbances caused by assembly errors, and further ensuring the concentricity of the valve needle 500 sliding. When separately configured, the valve seat 220 can be made of a material with high wear resistance and high sealing performance and processed separately, while the body 210 can be made of a material with good flow guiding characteristics and cost advantages, achieving an optimal match between function and cost. At the same time, it is convenient to perform precision grinding or surface treatment on the valve port 221, improving its sealing reliability when it cooperates with the valve needle 500. In addition, for the separate molding of the valve seat 220 and the body 210, the valve seat 220 and the body 210 can be connected by welding to form the guide sleeve 200.

[0034] Furthermore, in this embodiment, please refer to Figures 1 to 3 The electronic expansion valve also includes a second refrigerant delivery pipe 302. The valve seat 220 includes a connecting portion 230 protruding from the mounting port 120, and the second refrigerant delivery pipe 302 is sleeved on the connecting portion 230. It can be understood that by sleeved the second refrigerant delivery pipe 302 on the connecting portion 230, a reliable connection between the valve seat 220 and the external refrigeration pipeline is achieved. This simplifies the assembly process and, through the protrusion of the connecting portion 230, provides a clear positioning reference and sufficient welding or crimping area for the second refrigerant delivery pipe 302, improving connection strength and sealing reliability. Since the valve port 221 is located on the valve seat 220, and the valve seat 220 is directly connected to the second refrigerant delivery pipe 302 through the connecting portion 230, the refrigerant can immediately enter the second refrigerant delivery pipe 302 after flowing out from inside the guide sleeve 200 through the valve port 221. The flow path is continuous and smooth, avoiding increased flow resistance or eddy currents caused by structural abrupt changes or corners. Simultaneously, the diameter of the connecting part 230 can be adjusted to accommodate second refrigerant delivery pipes 302 of different diameters. Furthermore, in this embodiment, the electronic expansion valve also includes a first refrigerant delivery pipe 301, which is inserted into the valve seat 100. The connection method between the second refrigerant delivery pipe 302 and the connecting part 230, and the connection method between the first refrigerant delivery pipe 301 and the valve seat 100, can be welding or interference fit, etc.

[0035] In one embodiment, please refer to Figure 1 and Figure 2 In the axial direction of the electronic expansion valve, the guide sleeve 200 extends from the valve port 221 towards the valve cavity 110 at a height of L3, and the distance from the central axis of the first refrigerant delivery pipe 301 to the valve port 221 is L2, satisfying: It should be noted that the value of L2 is the same as described above and will not be repeated here. The starting point of L3 is the position of valve port 221 on the cavity wall of valve chamber 110, and the ending point is the farthest position of the guide sleeve 200 along the axial direction to valve port 221. In this way, the guide sleeve 200 fully covers or even exceeds the radial area of ​​the first refrigerant delivery pipe 301 in the axial direction. When the refrigerant enters the valve chamber 110 from the first refrigerant delivery pipe 301, it can be effectively blocked and guided by the body part 210 of the guide sleeve 200, avoiding direct impact on the valve needle 500 located in the center of the valve chamber 110. Since L3 is greater than L2, the extended part of the guide sleeve 200 forms a complete "barrier" in the axial direction, forcing the refrigerant flowing in laterally to flow along the outer wall of the guide sleeve 200 and enter the interior of the guide sleeve 200 through the axially misaligned, circumferentially offset guide hole 211 on its side wall, which is adjacent to the valve port 221, and then flows out smoothly through the valve port 221. Of course, in other embodiments, when the end of the guide sleeve 200 away from the valve port 221 is sealed, and the interior of the guide sleeve 200 can only communicate with the valve cavity 110 through the guide hole 211, the axial extension height L3 of the guide sleeve 200 does not need to be limited.

[0036] In one embodiment, please refer to Figure 1 and Figure 2The electronic expansion valve also includes a nut 400, which is connected to the valve seat 100 to enclose and form a valve cavity 110. The end of the nut 400 opposite the valve port 221 has a protruding mounting protrusion 410. The end of the guide sleeve 200 away from the valve port 221 is fitted onto the mounting protrusion 410. It can be understood that the end of the valve seat 100 away from the valve port 221 is wide-open, and the nut 400 covers this wide opening, together with the valve seat 100, forming the valve cavity 110. This ensures that the valve cavity 110 is supplied with refrigerant only through the first refrigerant delivery pipe 301 and the valve port 221. Specifically, the nut 400 has a protruding mounting protrusion 410 at its end opposite the valve port 221, and the end of the guide sleeve 200 away from the valve port 221 is fitted and fixed onto the mounting protrusion 410. The mounting protrusion 410 provides stable axial positioning and radial support for the guide sleeve 200, preventing it from loosening or shifting under refrigerant pressure fluctuations or vibrations. Furthermore, the precise fit between the mounting protrusion 410 and the end of the guide sleeve 200 further ensures the coaxiality between the guide sleeve 200 and the valve seat 100, thereby indirectly maintaining the concentric operation of the valve needle 500 during sliding. Simultaneously, this assembly method simplifies the installation process of the guide sleeve 200, avoiding the use of additional fasteners. While improving structural compactness, it ensures that the pre-defined spatial relationship between the guide hole 211, the first refrigerant delivery pipe 301, and the valve port 221 remains precisely maintained after assembly. In addition, the fit between the mounting protrusion 410 and the guide sleeve 200 ensures that the guide sleeve 200 and the valve cavity 110 can only communicate through the guide hole 211, guaranteeing the reliability of the guide sleeve 200 in reducing refrigerant impact on the valve core. Of course, in other embodiments, an annular groove may be recessed on the side of the nut 400 facing the valve port 221, and the end of the guide sleeve 200 away from the valve port 221 may be inserted into the annular groove. Alternatively, when the end of the guide sleeve 200 with the valve port 221 is connected and fixed to the valve seat 100, the end of the guide sleeve 200 away from the valve port 221 may also have a gap with the nut 400 to reduce the probability of the nut 400 interfering with the installation of the guide sleeve 200 and the valve seat 100.

[0037] This utility model also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The refrigeration device can be an air conditioner or a refrigerator, etc.

[0038] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An electronic expansion valve, characterized in that, include: A valve seat having a valve cavity, and a first refrigerant delivery pipe communicating with the valve cavity is provided on the side wall of the valve seat; as well as A flow guide sleeve is connected to the valve seat and is at least partially located in the valve cavity. The flow guide sleeve or the valve seat has a valve port that penetrates the valve seat and communicates with the inside of the flow guide sleeve. The side wall of the flow guide sleeve is opposite to the first refrigerant delivery pipe in the radial direction of the electronic expansion valve. The side wall of the flow guide sleeve is provided with a flow guide hole, which is not directly opposite to the first refrigerant delivery pipe. Wherein, the total area of ​​the guide holes is S1, and the area of ​​the valve port is S2, satisfying: .

2. The electronic expansion valve as described in claim 1, characterized in that, The flow guide hole and the first refrigerant delivery pipe are offset in the axial direction of the electronic expansion valve, and the flow guide hole is located adjacent to the valve port.

3. The electronic expansion valve as described in claim 2, characterized in that, Along the axial direction of the electronic expansion valve, the distance from the central axis of the guide hole to the valve port is L1, and the distance from the central axis of the first refrigerant delivery pipe to the valve port is L2, satisfying: .

4. The electronic expansion valve as described in claim 1, characterized in that, The guide sleeve is provided with a plurality of guide holes, and the guide holes and the first refrigerant delivery pipe are staggered in the circumferential direction of the guide sleeve.

5. The electronic expansion valve as described in claim 4, characterized in that, On the axial projection plane of the electronic expansion valve, the angle between the central axis of the guide hole located adjacent to the first refrigerant delivery pipe and the central axis of the first refrigerant delivery pipe is α, satisfying: .

6. The electronic expansion valve as described in claim 1, characterized in that, The flow guide sleeve includes a valve seat and a body. The valve seat has an installation port, the valve seat is installed in the installation port, the flow guide hole is disposed in the body, and the valve port is disposed in the valve seat.

7. The electronic expansion valve as described in claim 6, characterized in that, The valve seat and the main body are integrally formed or separately disposed; And / or, the electronic expansion valve further includes a second refrigerant delivery pipe, and the valve seat includes a connecting portion protruding from the mounting port, the second refrigerant delivery pipe being sleeved on the connecting portion.

8. The electronic expansion valve as described in claim 1, characterized in that, In the axial direction of the electronic expansion valve, the guide sleeve extends from the valve port toward the valve cavity at a height of L3, and the distance from the central axis of the first refrigerant delivery pipe to the valve port is L2, satisfying: .

9. The electronic expansion valve as described in any one of claims 1 to 8, characterized in that, The electronic expansion valve also includes a nut connected to the valve seat to enclose and form the valve cavity. The end of the nut opposite to the valve port has a mounting protrusion, and the end of the flow guide sleeve away from the valve port is sleeved on the mounting protrusion.

10. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in any one of claims 1 to 9.

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