Electronic expansion valve and air conditioner

Abstract

The present invention discloses an electronic expansion valve and an air conditioner, wherein the electronic expansion valve comprises: a valve body having a valve cavity, and a first valve port and a second valve port communicating with the valve cavity; a sleeve housed in the valve cavity, the sleeve dividing the valve cavity into a first valve cavity located inside the sleeve and a second valve cavity located outside the sleeve, the first valve port communicating with the first valve cavity, the second valve port communicating with the second valve cavity, a tube wall of the sleeve being provided with a plurality of noise reduction holes communicating with the first valve cavity and the second valve cavity, the plurality of noise reduction holes being arranged along the circumference of the sleeve, the apertures of the plurality of noise reduction holes gradually increasing in the direction of the sleeve from the side close to the second valve port toward the side away from the second valve port; and a valve needle slidably mounted in the first valve cavity and used to open or close the first valve port. The technical solution of the present invention is intended to reduce refrigerant noise.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, in particular to an electronic expansion valve and an air conditioner. Background Art

[0002] Electronic expansion valves are commonly used to regulate fluid flow in air conditioners, refrigerators, heat pump water heaters, and various other cooling and heating equipment. These valves are throttling elements that use an electrical signal generated by the regulated parameter to control the voltage or current applied to the expansion valve, thereby regulating the amount of fluid supplied.

[0003] In the related art, the refrigerant is in a turbulent state when flowing through the electronic expansion valve. The refrigerant in the turbulent state exhibits disordered movement and emits refrigerant sound. Summary of the Invention

[0004] The main purpose of the present invention is to provide an electronic expansion valve, which is intended to reduce refrigerant noise.

[0005] To achieve the above-mentioned purpose, the electronic expansion valve proposed in the present invention comprises:

[0006] The valve body comprises a valve cavity, and a first valve port and a second valve port communicating with the valve cavity;

[0007] a sleeve housed in the valve cavity, the sleeve dividing the valve cavity into a first valve cavity located within the sleeve and a second valve cavity located outside the sleeve, the first valve port communicating with the first valve cavity, the second valve port communicating with the second valve cavity, a tube wall of the sleeve being provided with a plurality of noise reduction holes communicating with the first valve cavity and the second valve cavity, the plurality of noise reduction holes being arranged along the circumference of the sleeve, and the apertures of the plurality of noise reduction holes gradually increasing from a side of the sleeve close to the second valve port toward a side of the sleeve away from the second valve port; and

[0008] The valve needle is slidably mounted in the first valve cavity and is used to open or close the first valve port.

[0009] Optionally, in a direction away from the first valve port, the apertures of the plurality of noise reduction holes gradually decrease.

[0010] Optionally, the noise reduction hole is a straight hole, an inclined hole or a variable diameter hole.

[0011] Optionally, the diameter of the noise reduction hole with the smallest diameter among the plurality of noise reduction holes is in the range of 0.1 mm to 2 mm.

[0012] Optionally, a plurality of the noise reduction holes are evenly spaced and arranged in a circumferential direction of the sleeve.

[0013] Optionally, in a direction away from the first valve port, the plurality of noise reduction holes are evenly spaced and arranged.

[0014] Optionally, the sleeve includes a valve needle sleeve away from the first valve port and a noise reduction sleeve close to the first valve port, the noise reduction hole is provided in the noise reduction sleeve, the valve needle includes a movable part slidably installed in the valve needle sleeve, and a needle tip part connected to one end of the movable part close to the first valve port, the needle tip part is used to open or close the first valve port, when the needle tip part opens the first valve port, the multiple noise reduction holes are connected to the first valve cavity.

[0015] Optionally, the valve needle sleeve is detachably connected to the noise reduction sleeve.

[0016] Optionally, a ratio of a length of the valve needle separated from the valve needle sleeve to a diameter of the movable portion is less than or equal to 2.

[0017] The present invention also provides an air conditioner, comprising the aforementioned electronic expansion valve.

[0018] In the technical solution of the present invention, the refrigerant flows into the second valve cavity from the second valve port, and then contacts the sleeve. The refrigerant flow rate is slowed down under the obstruction of the sleeve wall, thereby alleviating the turbulent state of the refrigerant and changing the state of the refrigerant from turbulent to laminar flow. It can be understood that turbulent flow is disordered, and multiple streams of fluid will collide with each other in the refrigerant to emit refrigerant sound. When the turbulent state transitions to the laminar state, the movement of the refrigerant becomes orderly, thereby reducing the refrigerant sound; in addition, the refrigerant in the turbulent state will contain large bubbles when flowing, and when the large bubbles pass through the first valve port, they will burst and produce refrigerant sound. In order to avoid the large bubbles from bursting at the first valve port, the large bubbles in the refrigerant will be separated into several small bubbles through the noise reduction holes, and several small bubbles can pass through the first valve port smoothly, thereby reducing the refrigerant sound. It should be noted that the refrigerant further improves the state of the refrigerant when passing through the noise reduction holes, making the refrigerant flow softer; it can be understood that the refrigerant reduces the refrigerant sound under the action of the noise reduction holes with smaller apertures. Noise, the refrigerant located near the smaller noise reduction hole will flow to both sides along the circumference of the tube wall of the sleeve, and the refrigerant will be guided through the noise reduction holes with larger apertures. It should be understood that even the noise reduction holes with larger apertures have excellent effects on reducing refrigerant noise. It should be pointed out that the size of the hole is relative. In the direction of the sleeve from the side close to the second valve port to the side away from the second valve port, the apertures of the multiple noise reduction holes increase, and the ability to refine the large bubbles in the refrigerant in this direction gradually decreases, but the ability to guide the refrigerant gradually increases. It can be understood that the faster the refrigerant flow rate, the more bubbles the refrigerant contains. Part of the high-speed refrigerant is effectively reduced in the smaller noise reduction holes, and the other part decreases in speed due to the obstruction of the tube wall of the sleeve. The number of bubbles in this part of the refrigerant is reduced, and this part of the refrigerant accumulates in the first valve cavity, that is, the noise reduction conditions of this part of the refrigerant are reduced, but the guidance conditions are increased, and it is noise-reduced and guided in turn through the gradually larger noise reduction holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 This is a structural diagram of an electronic expansion valve according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0022] Figure 3 This is a structural diagram of another embodiment of the electronic expansion valve of the present invention;

[0023] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 valve body 110 Valve cavity 111 First valve chamber 112 Second valve chamber 120 First valve port 130 Second valve port 140 valve seat 150 Valve port 200 casing 210 Noise reduction holes 220 Overflow hole 230 Valve needle sleeve 240 Noise reduction sleeve 300 valve needle 310 Activities Department 320 needle tip

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] Electronic expansion valves are commonly used to regulate fluid flow in air conditioners, refrigerators, heat pump water heaters, and various other cooling and heating equipment. These valves are throttling elements that use an electrical signal generated by the regulated parameter to control the voltage or current applied to the expansion valve, thereby regulating the amount of fluid supplied.

[0032] In the related art, the refrigerant is in a turbulent state when flowing through the electronic expansion valve. The refrigerant in the turbulent state exhibits disordered movement and emits refrigerant sound.

[0033] In view of this, the present invention proposes an electronic expansion valve.

[0034] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the electronic expansion valve comprises:

[0035] The valve body 100 has a valve cavity 110 and a first valve port 120 and a second valve port 130 communicating with the valve cavity 110 ;

[0036] a sleeve 200 received in the valve cavity 110, the sleeve 200 separating the valve cavity 110 into a first valve cavity 111 located within the sleeve 200 and a second valve cavity 112 located outside the sleeve 200, the first valve port 120 communicating with the first valve cavity 111, the second valve port 130 communicating with the second valve cavity 112, a tube wall of the sleeve 200 being provided with a plurality of noise reduction holes 210 communicating with the first valve cavity 111 and the second valve cavity 112, the plurality of noise reduction holes 210 being arranged along the circumference of the sleeve 200, and the apertures of the plurality of noise reduction holes 210 gradually increasing from a side of the sleeve 200 close to the second valve port 130 toward a side away from the second valve port 130; and

[0037] The valve needle 300 is slidably mounted in the first valve cavity 111 and is used to open or close the first valve port 120 .

[0038] In the technical solution of the present invention, the refrigerant flows from the second valve port 130 into the second valve cavity 112, and then contacts the sleeve 200. The refrigerant flow rate is slowed down by the obstruction of the sleeve 200 wall, thereby alleviating the turbulent state of the refrigerant and changing the state of the refrigerant from turbulent to laminar flow. It can be understood that turbulent flow is disordered, and multiple streams of fluid in the refrigerant will collide with each other and emit refrigerant sound. When the turbulent state transitions to the laminar state, the movement of the refrigerant becomes orderly, thereby reducing the refrigerant sound. In addition, the refrigerant in the turbulent state will contain large bubbles when flowing, When large bubbles pass through the first valve port 120, they will burst and produce refrigerant sound. In order to prevent large bubbles from bursting at the first valve port 120, the large bubbles in the refrigerant will be separated into several small bubbles through the noise reduction holes 210. Several small bubbles can pass through the first valve port 120 smoothly, thereby reducing the refrigerant sound. It should be noted that the refrigerant further improves the state of the refrigerant when passing through the noise reduction holes 210, making the refrigerant flow softer; it can be understood that the refrigerant reduces the refrigerant sound under the action of the noise reduction holes 210 with smaller apertures, and the refrigerant in the smaller The refrigerant near the noise reduction holes 210 will flow to both sides along the circumference of the tube wall of the sleeve 200, and the refrigerant will be guided through the noise reduction holes 210 with larger apertures. It should be understood that even the noise reduction holes 210 with larger apertures have excellent effects in reducing the refrigerant noise. It should be pointed out that the size of the holes is relative. In the direction of the sleeve 200 from the side close to the second valve port 130 to the side away from the second valve port 130, the apertures of the multiple noise reduction holes 210 gradually increase, and the refrigerant in this direction is refined. The ability to remove large bubbles gradually decreases, but the ability to guide the refrigerant gradually increases. It can be understood that the faster the refrigerant flow rate is, the more bubbles the refrigerant contains. Part of the high-speed refrigerant is effectively reduced in the smaller noise reduction hole 210, and the other part decreases in speed due to the obstruction of the pipe wall of the sleeve 200, then the number of bubbles in this part of the refrigerant decreases, and this part of the refrigerant accumulates in the first valve cavity, that is, the noise reduction condition of this part of the refrigerant decreases, but the guidance condition increases, then it is noise-reduced and guided in turn through the gradually enlarged noise reduction hole 210.

[0039] It should be pointed out that the aperture should be understood in a broad sense and should be understood as an equivalent aperture. For example, the aperture area of ​​an aperture of 1 mm should be equivalent to the aperture area of ​​a circular hole with an aperture of 1 mm.

[0040] In one embodiment, the electronic expansion valve further includes a drive mechanism for driving the valve needle 300. The drive mechanism includes a rotor structure, a stator structure, a threaded drive structure, and a rotation-stop structure, among other components. These components cooperate to enable the valve needle 300 to open or close the first valve port 120. The drive mechanism is conventional and will not be described in detail herein. Of course, in other embodiments, the drive mechanism may include other structures, as long as they enable the valve needle to open or close the first valve port.

[0041] Optionally, in one embodiment, the apertures of the multiple noise reduction holes 210 gradually decrease in the direction away from the first valve port 120. It can be understood that if the flow rate of the refrigerant entering the second valve cavity 112 from the second valve port 130 is fast enough, the refrigerant is likely to accumulate in the second valve cavity 112. In order to divert the accumulated refrigerant, the noise reduction holes 210 with larger apertures are arranged close to the first valve port 120. It can be understood that the larger the aperture, the stronger the ability to divert the refrigerant, and the amount of refrigerant flowing into the first valve cavity 111 is accelerated. In addition, large bubbles in the refrigerant will float to the upper layer of the refrigerant. The noise reduction holes 210 with smaller apertures are arranged away from the first valve port 120, which is conducive to separating the large bubbles floating to the upper layer in the refrigerant into multiple small bubbles. Multiple small bubbles can pass through the first valve port 120, thereby reducing the refrigerant sound.

[0042] Of course, in other embodiments, in the direction away from the first valve port, the apertures of the multiple noise reduction holes gradually become smaller and then become larger. The noise reduction holes with larger apertures away from the first valve port can prevent the refrigerant from rising to the noise reduction holes with smaller apertures and then rising endlessly, further promoting the ability to guide the refrigerant.

[0043] Optionally, in one embodiment, the noise reduction hole 210 is a straight hole, an oblique hole, or a variable diameter hole. The variable diameter hole may, but is not limited to, increase in size, decrease in size, first decrease in size and then increase in size, or first increase in size and then decrease in size along its axis. For the noise reduction hole 210 whose diameter increases first and then decreases, multiple streams of disordered fluid in the refrigerant can be fully mixed in the variable diameter hole to form a single stream that enters the first valve chamber 111, further reducing refrigerant noise. Straight holes are easier to process and help reduce processing costs. Of course, in other embodiments, the noise reduction hole can also be a special-shaped hole, as long as it can reduce refrigerant noise and guide refrigerant.

[0044] Optionally, in one embodiment, the aperture range of the noise reduction hole 210 with the smallest aperture value among the multiple noise reduction holes 210 is 0.1mm-2mm. It can be understood that the smaller the aperture of the noise reduction hole 210, the better the noise reduction effect, and the worse the ability to guide the refrigerant. The larger the aperture of the noise reduction hole 210, the better the ability to guide the refrigerant, and the weaker the noise reduction effect. When the aperture range of the noise reduction hole 210 with the smallest aperture value among the noise reduction holes 210 is 0.1mm-2mm, it has both excellent noise reduction effect and good ability to guide the refrigerant. Specifically, in one embodiment, the aperture range is 1.5mm. It can be understood that the aperture value of the other noise reduction holes is greater than or equal to the aperture value of the smallest noise reduction hole, that is, it has a better noise reduction effect and excellent ability to guide the refrigerant.

[0045] Optionally, in one embodiment, a plurality of the noise reduction holes 210 are evenly spaced and arranged in a circumferential direction of the sleeve 200; in this way, it is regular and easy to obtain batch-produced, consistent products.

[0046] Optionally, in one embodiment, the centroids of any adjacent noise reduction holes 210 are arranged at equal intervals in the direction from the first valve port 120 toward the first valve cavity 111 , so that it is regular and easy to obtain batch-produced, consistent products.

[0047] Specifically, in one embodiment, multiple rows of noise reduction rows are provided in a direction away from the first valve port 120, each row includes multiple noise reduction holes 210, and the multiple noise reduction holes 210 in each row are arranged circumferentially on the tube wall of the sleeve 200. In the circumferential direction, the axes of the multiple noise reduction holes 210 are arranged at equal angles, and in the direction away from the first valve port 120, each row is arranged at equal intervals.

[0048] Of course, in other embodiments, multiple noise reduction holes can be evenly distributed on the wall of the sleeve, that is, the centroids of any two adjacent noise reduction holes are arranged at equal intervals. It should be noted that approximately equal intervals are also within the protection range of equal intervals.

[0049] Optionally, in one embodiment, the sleeve 200 includes a valve needle sleeve 230 away from the first valve port 120 and a noise reduction sleeve 240 close to the first valve port 120, the noise reduction hole 210 is provided in the noise reduction sleeve 240, the valve needle 300 includes a movable part 310 slidably installed in the valve needle sleeve 230, and a needle tip part 320 connected to one end of the movable part 310 close to the first valve port 120, the needle tip part 320 is used to open or close the first valve port 120, when the needle tip part 320 opens the first valve port 120, multiple noise reduction holes 210 are connected to the first valve cavity 111. The valve needle sleeve 230 of the sleeve 200 provides a guide for the movable part 310 of the valve needle 300, and the noise reduction sleeve 240 is used to reduce the refrigerant noise; the noise reduction sleeve 240 is arranged close to the first valve port 120. After the refrigerant passes through the noise reduction hole 210, the large bubbles are separated into multiple small bubbles, and the multiple small bubbles quickly pass through the first valve port 120 before they are recombined into large bubbles, thereby reducing the refrigerant noise. It should be noted that when the needle tip 320 opens the first valve port 120, the multiple noise reduction holes 210 communicate with the first valve cavity 111. Specifically, the valve needle 300 does not block the noise reduction holes 210 when approaching or moving away from the first valve port 120, thereby ensuring that the noise reduction holes 210 always communicate with the first valve cavity 111 and the second valve cavity 112, thereby ensuring the fluidity of the refrigerant. Specifically, in one embodiment, the thickness of the noise reduction sleeve 240 is smaller than that of the valve needle sleeve 230, so that the first valve cavity 111 increases in size as it approaches the first valve port 120. In this way, the valve needle 300 does not block the noise reduction holes when approaching or moving away from the first valve port 120. Of course, in other embodiments, the movable portion 310 of the valve needle 300 can slide only within the valve needle sleeve 230, that is, the movable portion 310 does not slide out of the valve needle sleeve 230, and thus the valve needle 300 does not block the noise reduction holes 210. Of course, there are other embodiments, which are not listed here.

[0050] Of course, in other embodiments, the sleeve does not include the valve needle sleeve, the sleeve is arranged on the valve needle sleeve and has a gap with the valve needle sleeve, the valve needle sleeve is provided with an overflow hole that flows with the noise reduction hole, the noise reduction hole and the overflow hole are staggered, and the refrigerant can enter the noise reduction hole, the gap, the overflow hole and the cavity of the valve needle sleeve, and the first valve port in sequence. The multiple streams of refrigerant passing through the noise reduction hole can be fully mixed in the gap, which greatly reduces the mutual collision between the multiple streams of fluid, further reducing the refrigerant noise. In addition, the multiple streams of refrigerant passing through the noise reduction hole will directly face the tube wall of the valve needle sleeve, avoiding direct collision of multiple high-speed refrigerants, which greatly reduces the refrigerant noise;

[0051] Or, refer to Figure 3 and Figure 4 The sleeve 200 does not include the valve needle sleeve 230. The sleeve 200 is sleeved on the valve needle sleeve 230. The valve needle sleeve 230 is provided with an overflow hole 220 arranged opposite to the noise reduction hole 210. In this way, after the large bubbles in the refrigerant are separated into multiple small bubbles by the noise reduction hole, the multiple small bubbles can quickly flow to the first valve port 120 through the overflow hole 220. Before the multiple small bubbles become large bubbles, they can quickly pass through the first valve port 120, thereby reducing the refrigerant noise.

[0052] It should be pointed out that, referring to Figure 1 and Figure 2 In one embodiment, the second valve port 130 is opposite to part of the valve needle sleeve 230 and part of the noise reduction sleeve 240 in the axial direction thereof. In this way, part of the refrigerant entering through the second valve port 130 will be blocked by the valve needle sleeve 230 and fall due to gravity. During the falling process, it will be driven by another part of the refrigerant and pass through the noise reduction hole 210 together. It can be understood that when this part of the refrigerant is driven by another part of the refrigerant, the flow rate of the other part of the refrigerant will be reduced, and the flow rate through the noise reduction hole 210 will also be lower, which can reduce the refrigerant sound when multiple refrigerants intersect in the first valve chamber 111, or reduce the force of impacting the valve needle 300 to reduce the noise of the valve needle 300 shaking.

[0053] Optionally, in one embodiment, the valve needle sleeve 230 and the noise reduction sleeve 240 are detachably connected to facilitate replacement and maintenance of the valve needle sleeve 230. In other embodiments, the valve needle sleeve and the noise reduction sleeve are integrally formed, and the structural stability of the integrally formed sleeve is greatly improved, and will not shake due to high-speed impact of the refrigerant.

[0054] Specifically, in one embodiment, the gap formed between the valve body 100 and the valve needle sleeve 230 near the first valve port 120 provides interference fit for the noise reduction sleeve 240. In other embodiments, the noise reduction sleeve may be, but is not limited to, screw-locked or snap-connected to the valve needle sleeve.

[0055] It is worth mentioning that in one embodiment, the valve body 100 includes a valve seat 140 and a valve opening portion 150 detachably connected to the valve seat 140. The first valve opening 120 is disposed on the valve opening portion 150. One end of the noise reduction sleeve 240 is connected to the valve needle sleeve 230, and the other end is connected to the valve seat 140 and the valve opening portion 150. In this way, the noise reduction sleeve 240 greatly improves the installation stability of the noise reduction portion. Of course, in other embodiments, the valve opening portion further includes a positioning ring protrusion protruding toward the valve needle sleeve. The pipe opening at one end of the noise reduction sleeve can be sleeved on the positioning ring protrusion, and the other end of the noise reduction sleeve abuts the valve needle sleeve. The positioning ring protrusion not only provides a positioning function for the noise reduction sleeve, but also ensures that the noise reduction sleeve remains stable and does not shake when high-speed refrigerant impacts the valve needle sleeve, greatly improving the stability of the noise reduction sleeve.

[0056] Optionally, in one embodiment, the noise reduction sleeve 240 is in the shape of a circular tube, and the circular tube-shaped noise reduction sleeve 240 has a smoothly transitioned outer peripheral surface, which is conducive to guiding the refrigerant. Of course, in other embodiments, there are other application requirements, and the noise reduction sleeve can also be, but is not limited to, a square tube shape. For example, the noise reduction sleeve is in the shape of a truncated cone, and the smaller part of the pipe opening of the noise reduction sleeve is arranged close to the first valve opening, and the larger part of the pipe opening is arranged away from the first valve opening and close to the second valve opening. The noise reduction hole is inclined toward the first valve opening on the outer peripheral surface of the noise reduction sleeve, so that the refrigerant flowing in from the second valve opening will flow along the outer peripheral surface of the noise reduction sleeve. It can be understood that the outer peripheral surface has a smooth transition, which provides a guiding effect for the flow of the refrigerant. Then, the refrigerant passes through the first valve opening quickly through the inclined noise reduction hole. Since the noise reduction hole is inclined toward the first valve opening, large bubbles are separated into small bubbles by the noise reduction hole, and can quickly pass through the first valve opening before the small bubbles become large bubbles, further reducing the refrigerant sound.

[0057] Optionally, in one embodiment, referring to Figure 2 The ratio between the length L of the valve needle 300 separated from the valve needle sleeve 230 and the diameter D of the movable portion 310 is less than or equal to 2. When this ratio is too large, the valve needle 300 is easily impacted by the refrigerant and vibrates, thereby generating noise. When this ratio is less than or equal to 2, the valve needle 300 is stable when the refrigerant impacts the valve needle 300, thereby reducing noise. Specifically, in one embodiment, the ratio is 1.5.

[0058] The present invention also proposes an air conditioner, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above-mentioned embodiment. Since this electronic expansion valve adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0059] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: The valve body comprises a valve cavity, and a first valve port and a second valve port communicating with the valve cavity; a sleeve housed in the valve cavity, the sleeve dividing the valve cavity into a first valve cavity located within the sleeve and a second valve cavity located outside the sleeve, the first valve port communicating with the first valve cavity, the second valve port communicating with the second valve cavity, a tube wall of the sleeve being provided with a plurality of noise reduction holes communicating with the first valve cavity and the second valve cavity, the plurality of noise reduction holes being arranged along the circumference of the sleeve, and the apertures of the plurality of noise reduction holes gradually increasing from a side of the sleeve close to the second valve port toward a side of the sleeve away from the second valve port; and The valve needle is slidably mounted in the first valve cavity and is used to open or close the first valve port.

2. The electronic expansion valve according to claim 1, characterized in that In a direction away from the first valve port, the apertures of the plurality of noise reduction holes gradually decrease.

3. The electronic expansion valve according to claim 1, wherein: The noise reduction hole is a straight hole, an inclined hole or a variable diameter hole.

4. The electronic expansion valve according to claim 1, wherein: The diameter of the smallest noise reduction hole among the plurality of noise reduction holes is in the range of 0.1 mm to 2 mm.

5. The electronic expansion valve according to claim 1, characterized in that: In the circumferential direction of the sleeve, the plurality of noise reduction holes are evenly spaced and arranged.

6. The electronic expansion valve according to claim 1, characterized in that: In a direction away from the first valve port, the plurality of noise reduction holes are evenly spaced and arranged.

7. The electronic expansion valve according to any one of claims 1 to 6, characterized in that: The sleeve includes a valve needle sleeve away from the first valve port and a noise reduction sleeve close to the first valve port, the noise reduction hole is provided in the noise reduction sleeve, the valve needle includes a movable part slidably installed in the valve needle sleeve, and a needle tip part connected to one end of the movable part close to the first valve port, the needle tip part is used to open or close the first valve port, when the needle tip part opens the first valve port, the multiple noise reduction holes are connected to the first valve cavity.

8. The electronic expansion valve according to claim 7, characterized in that: The valve needle sleeve is detachably connected to the noise reduction sleeve.

9. The electronic expansion valve according to claim 7, characterized in that: The ratio of the length of the valve needle separated from the valve needle sleeve to the diameter of the movable part is less than or equal to 2.

10. An air conditioner, characterized in that: The electronic expansion valve comprises the electronic expansion valve according to any one of claims 1 to 8.

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