Noise reduction device, electronic expansion valve, noise reduction method, and electronic expansion valve assembly

Abstract

The present disclosure provides a noise reduction device, an electronic expansion valve and an electronic expansion valve assembly, and a noise reduction method, the noise reduction device including an outer sleeve, an inner sleeve and a connecting part. The outer sleeve has an outer sleeve inner wall, the inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall, the inner sleeve inner wall forms a main flow path, the main flow path has a main inlet and a main outlet along the fluid flow direction, and the connecting part connects the outer sleeve inner wall and the inner sleeve outer wall. The connecting part, the inner sleeve outer wall and the outer sleeve inner wall form a flow guide channel, the flow guide channel has a flow guide inlet and a flow guide outlet along the fluid flow direction, the flow guide inlet is for guiding a part of the fluid flowing out of the main outlet to the flow guide channel, and the flow guide outlet is for guiding the fluid in the flow guide channel to the main inlet. With the above structure, the present disclosure can avoid the formation of a dead zone of the flow around the bend around the main flow path outlet, causing bubbles to stagnate, and can reduce the bursting of bubbles, and further achieve the purpose of noise reduction.

Description

[Technical Field]

[0001] Related Applications This disclosure claims priority to Chinese patent publication No. 202210673355.1, filed on June 14, 2022, and entitled "Noise Reduction Device, Electronic Expansion Valve, and Noise Reduction Method," the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of electronic expansion valves, and more particularly to an electronic expansion valve with a noise reduction device and a noise reduction method. [Background technology]

[0003] An electronic expansion valve is a control device applied to refrigeration equipment. Currently, electronic expansion valves are increasingly being used in small and medium-sized refrigeration equipment, and the most common application is in home air conditioning, where electrical signal control is used to ensure stable and efficient operation of the air conditioning system.

[0004] An electronic expansion valve typically consists of an inlet pipe, a valve housing, a spindle assembly, and an outlet pipe. Refrigerant flows from the inlet pipe into the valve chamber (the interior area of ​​the valve housing), is throttled by the valve port, and then flows out through the outlet pipe. When the refrigerant flows through the valve port, cavitation frequently occurs, generating bubbles. The bubble formation and bursting process creates noise. Furthermore, when air-laden refrigerant flows through the valve port at high speed, a whistling noise is likely to occur. This noise is usually caused by an improper valve port structural design.

[0005] Conventional noise reduction devices only partially optimize their structure, such as by providing a plate member with multiple small holes in the refrigerant flow path to break down bubbles in the two-phase refrigerant and reduce noise, or by providing a baffle wall to separate the two-phase refrigerant and mitigate noise. However, such optimizations usually only work under specific operating conditions, do not achieve significant noise reduction effects, and require installation requirements, which make installation complicated and are not conducive to improving noise reduction efficiency. Summary of the Invention

[0006] According to one aspect of the present disclosure, there is provided a noise reduction device including an outer sleeve, an inner sleeve, and a connecting portion. The outer sleeve has an inner wall, and the inner sleeve has an inner wall and an outer wall, the inner wall forming a main flow path, the main flow path having a main inlet and a main outlet along a fluid flow direction, and the connecting portion connecting the inner wall and the outer wall of the outer sleeve. The connecting portion, the outer wall of the inner sleeve, and the inner wall of the outer sleeve form a flow guide channel, the flow guide channel having a flow guide inlet and a flow guide outlet along the fluid flow direction, the flow guide inlet for guiding a portion of fluid flowing out from the main outlet to the flow guide channel, and the flow guide outlet for guiding fluid in the flow guide channel to the main inlet.

[0007] According to one embodiment of the present disclosure, the connection portion and the main outlet are located on the same plane.

[0008] According to one embodiment of the present disclosure, the inner diameter of the inner sleeve gradually increases from the main inlet to the main outlet.

[0009] According to one embodiment of the present disclosure, the main inlet has a hollow cylindrical shape, and the main outlet has a hollow cylindrical shape or a hollow truncated cone shape.

[0010] According to one embodiment of the present disclosure, the noise reduction device is applied to an electronic expansion valve, and the electronic expansion valve has a valve port, and the inner diameter of one end of the main inlet close to the valve port is the same as the inner diameter of one end of the valve port close to the main inlet.

[0011] According to one embodiment of the present disclosure, the flow guide inlet is provided at the connection portion, the flow guide outlet is provided at the outer wall of the inner sleeve, and the flow guide outlet is located at the main inlet.

[0012] According to one embodiment of the present disclosure, the flow guide inlet includes at least two first through holes, and the axes of the first through holes and the axis of the main flow passage are parallel to each other.

[0013] According to one embodiment of the present disclosure, the diameter of the first through-hole is equal to or less than 1 / 5 of the diameter of the main inlet.

[0014] According to an embodiment of the present disclosure, the flow guide outlet includes at least two second through holes, and the axes of the second through holes and the axis of the main flow passage form an included angle.

[0015] According to one embodiment of the present disclosure, the diameter of the second through hole is equal to or larger than 0.2 mm and equal to or smaller than 1 / 5 of the diameter of the main inlet.

[0016] According to an embodiment of the present disclosure, the angle between the axis of the second through-hole and the axis of the main channel along the fluid flow direction is greater than or equal to 90°.

[0017] According to one embodiment of the present disclosure, the outer sleeve, the inner sleeve and the connection portion are integrally molded.

[0018] According to another aspect of the present disclosure, there is provided an electronic expansion valve having a noise reduction device as described above.

[0019] According to another aspect of the present disclosure, there is provided a noise reduction method for the electronic expansion valve as described above, in which a main fluid and a flow guide fluid exist in the main flow path, and the flow velocity of the flow guide fluid is lower than the flow velocity of the main fluid.

[0020] According to yet another aspect of the present disclosure, there is provided an electronic expansion valve assembly including an outlet pipe, an inner sleeve, and a connecting part, wherein the outlet pipe has an outlet pipe inner wall, the inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall, the inner sleeve inner wall forming a main flow passage, the main flow passage having a main inlet and a main outlet along a fluid flow direction, the connecting part connecting the outlet pipe inner wall and the inner sleeve outer wall, the connecting part, the inner sleeve outer wall, and the outlet pipe inner wall forming a flow guide channel, the flow guide channel having a flow guide inlet and a flow guide outlet along the fluid flow direction, the flow guide inlet for guiding a portion of fluid flowing out from the main outlet to the flow guide channel, and the flow guide outlet for guiding fluid in the flow guide channel to the main inlet.

[0021] From the above technical aspects, it can be seen that the advantages and positive effects of the noise reduction device proposed in the present disclosure are as follows:

[0022] The noise reduction device proposed in this disclosure includes an outer sleeve, an inner sleeve, and a connecting part. The outer sleeve has an inner wall, and the inner sleeve has an inner wall and an outer wall. The inner wall of the inner sleeve forms a main flow path through which a two-phase refrigerant passes. The main flow path has a main inlet and a main outlet along the fluid flow direction, and the two-phase refrigerant flows in through the main inlet and out through the main outlet. A main flow path for the two-phase refrigerant is formed between the main inlet and the main outlet. The connecting part connects the inner wall of the outer sleeve to the outer wall of the inner sleeve. That is, at the position of the main outlet, the outer sleeve and the inner sleeve are connected to form an annular surface centered on the main outlet. The connecting part, the outer wall of the inner sleeve, and the inner wall of the outer sleeve form a flow guide channel, which is mainly used to return a portion of the two-phase refrigerant flowing out of the main outlet to the main flow path. The flow guide channel has a flow guide inlet and a flow guide outlet along the fluid flow direction. The flow guide inlet guides a portion of the fluid that has flowed out of the main outlet into the flow guide channel, and the flow guide outlet guides the fluid in the flow guide channel to the main inlet. That is, the flow guide inlet allows the guided two-phase refrigerant to enter the flow guide channel, and the flow guide outlet allows the guided two-phase refrigerant to flow out of the flow guide channel and enter the main channel. The provision of the flow guide channel prevents noise caused by bubbles trapped in a dead zone at the corner of the main channel outlet, and also forms a buffer area on the inner wall of the main channel near the main inlet, reducing bubble bursting and further reducing noise.

[0023] The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of preferred embodiments with reference to the drawings. [Brief explanation of the drawings]

[0024] The above and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof, taken in conjunction with the drawings.

[0025] [Figure 1] 1 is a schematic diagram of a three-dimensional structure of an embodiment of a noise reduction device according to the present disclosure. [Figure 2] FIG. 2 is a longitudinal sectional view of FIG. [Figure 3] FIG. 10 is a structural schematic diagram of another embodiment of a noise reduction device according to the present disclosure. [Figure 4] 1 is a structural schematic diagram of an electronic expansion valve according to the present disclosure; [Figure 5] 1 is a schematic diagram of an installation position of an electronic expansion valve of the present disclosure in a pipe. FIG. [Figure 6] FIG. 2 is a schematic diagram of another embodiment of an electronic expansion valve of the present disclosure. [Figure 7] FIG. 7 is a schematic diagram showing a partial structure of the noise reduction device in FIG. 6.

[0026] The symbols are explained as follows: 100 Noise reduction device 101 Outer sleeve 1011 Inner wall of outer sleeve 102 Inner sleeve 1021 Inner sleeve inner wall 1022 Inner sleeve outer wall 103 Connection 104 Main Channel 1041 Main Inlet 1042 Main Outlet 105 Flow Guide Channel 1051 Flow Guide Entrance 1052 Flow guide outlet 201 First through hole 202 Second through hole 300 Electronic expansion valve (part) 301 Inlet piping 302 Valve housing 303 Valve Orifice 304 Flow Guide Area 401 Spindle Assembly 402 Outlet piping DETAILED DESCRIPTION OF THE INVENTION

[0027] Exemplary embodiments will now be described more fully with reference to the drawings. However, exemplary embodiments may be embodied in various forms and should not be understood as limited to the embodiments described herein. Although relative terms such as "above" and "below" are used herein to describe the relative relationship of one illustrated assembly to another, these terms, like the exemplary orientations depicted in the drawings, are used herein merely for convenience. It will be understood that if the illustrated device is turned upside down, the illustrated "above" assembly would become the "below" assembly. Other relative terms, such as "top," "bottom," etc., have similar meanings. When a structure is "above" another structure, this can refer to the structure being integrally formed on the other structure, the structure being "directly" disposed on the other structure, or the structure being "indirectly" disposed on the other structure via another structure.

[0028] The terms "a," "an," "this," and "said" are intended to indicate the presence of one or more elements / components / etc., and the terms "comprise" and "have" are intended to indicate an open inclusive meaning, meaning that other elements / components / etc. may be present in addition to the listed elements / components / etc., and terms such as "first," "second," etc. are used as designations only and do not limit the number of their objects.

[0029] 1 , a noise reduction device 100 of the present disclosure includes an outer sleeve 101, an inner sleeve 102, and a connecting portion 103. The outer sleeve 101 has an outer sleeve inner wall 1011, and the inner sleeve 102 has an inner sleeve inner wall 1021 and an inner sleeve outer wall 1022, with the inner sleeve inner wall 1021 forming a main flow path 104. The main flow path 104 is for a two-phase refrigerant to pass through, and has a main inlet 1041 and a main outlet 1042 along the flow direction of the two-phase refrigerant. The two-phase refrigerant flows in from the main inlet 1041, passes through the main flow path 104, and then flows out from the main outlet 1042. The main flow path 104 for the two-phase refrigerant to pass through is formed between the main inlet 1041 and the main outlet 1042.

[0030] The connecting portion 103 connects the outer sleeve inner wall 1011 and the inner sleeve outer wall 1022, and the connecting portion 103 and the main outlet 1042 are located on the same plane. At the position of the main outlet 1042, the outer sleeve 101 and the inner sleeve 102 are connected to form an annular surface centered on the main outlet 1042, and this annular surface serves as the connecting portion 103. The connecting portion 103, the inner sleeve outer wall 1022, and the outer sleeve inner wall 1011 form a flow guide channel 105, which serves mainly to return a portion of the two-phase refrigerant flowing out from the main outlet 1042 of the main flow path 104, which is close to the connecting portion 103, back into the main flow path 104.

[0031] The flow guide channel 105 has a flow guide inlet 1051 and a flow guide outlet 1052 along the flow direction of the two-phase refrigerant. The flow guide inlet 1051 guides a portion of the two-phase refrigerant fluid flowing out from the main outlet 1042 into the flow guide channel 105, and the flow guide outlet 1052 guides the two-phase refrigerant fluid in the flow guide channel 105 to the main inlet 1041. The flow guide inlet 1051 allows the guided two-phase refrigerant to enter the flow guide channel 105, and the flow guide outlet 1052 allows the guided two-phase refrigerant to flow out of the flow guide channel 105 and into the main channel 104. The provision of the flow guide channel as described above can prevent noise caused by bubbles accumulating in a dead zone at the corner of the main channel outlet, and also forms a buffer area on the inner wall of the main channel near the main inlet, which reduces bubble bursting and further reduces noise.

[0032] In this embodiment, the inner diameter of the inner sleeve 102 increases from the main inlet 1041 toward the main outlet 1042. This increases the flow area along the flow direction of the two-phase refrigerant in the noise reduction device of the present disclosure, reduces factors that cause bubble bursting, and prevents sudden pressure changes in the two-phase refrigerant that cause bubble bursting, thereby achieving the purpose of noise reduction.

[0033] In this embodiment, the main inlet 1041 has a hollow cylindrical shape, and by configuring the main inlet 1041 to have a hollow cylindrical shape, the flow state of the two-phase refrigerant passing through the end of the valve port and entering the main flow path 104 of the noise reduction device 100 can be adjusted, thereby preventing a sudden increase in pressure and the bursting of a large number of bubbles, which would otherwise cause noise, when the two-phase refrigerant flows out the end of the valve port.The main outlet 1042 has a hollow cylindrical shape, so that the overall state of the two-phase refrigerant stabilizes after passing through the flow path in a section where the flow area gradually increases, thereby preventing significant turbulence and collisions from occurring in the two-phase refrigerant flowing out of the main outlet 1042. In some other embodiments, the main outlet 1042 may have a hollow truncated cone shape, as shown in FIG. 3, which also realizes a gradual increase in the flow area along the flow direction of the two-phase refrigerant, thereby avoiding the phenomenon of sudden changes in the pressure of the two-phase refrigerant, reducing the probability of bubble bursting, and further achieving the purpose of noise reduction.

[0034] In this embodiment, the flow guide inlet 1051 is provided at the connecting portion 103, and the flow guide inlet 1051 is mainly for guiding a portion of the two-phase refrigerant flowing out from the main outlet 1042 to the flow guide channel 105, so it is necessary to provide the flow guide inlet 1051 at the connecting portion 103 so as to facilitate guiding a portion of the two-phase refrigerant flowing out from the main outlet 1042. The flow guide outlet 1052 is provided at the outer wall 1022 of the inner sleeve, and passes through the inner wall 1021 of the inner sleeve to communicate with the main flow path 104. The flow guide outlet 1052 is located at the main inlet 1041 and is used to guide the two-phase refrigerant in the flow guide channel 105 into the main flow path 104. Since the flow velocity of the two-phase refrigerant in the flow guide channel 105 is significantly different from that in the main flow path 104, a buffer area is formed between the inner wall 1022 of the inner sleeve near the main inlet 1041 and the two-phase refrigerant flowing in the main flow path 104. This prevents newly generated bubbles from coming into contact with the inner wall 1022 of the inner sleeve due to the two-phase refrigerant in the main flow path 104, thereby reducing bubble bursting and noise.

[0035] 2 , in the noise reduction device 100 of the present disclosure, the flow guide inlet 1051 on the connecting portion 103 includes at least two first through holes 201, and the flow guide channel 105 is located between the outer sleeve 101 and the inner sleeve 102. Therefore, in order to guide a portion of the two-phase refrigerant flowing out from the main outlet 1042 to the flow guide channel 105 and to avoid noise caused by bubbles remaining in a dead zone at the corner of the main flow outlet, at least two first through holes 201 are required to form the flow guide inlet 1051. The number of first through holes 201 may be four, six, eight, nine, ten, etc., and may be evenly or unevenly distributed on the connecting portion 103. The axis of the first through hole 201 and the axis of the main flow path 104 are parallel, which is mainly to prevent the two-phase refrigerant entering the flow guide channel 105 from the first through hole 201 from forming unstable collisions with the wall of the flow guide channel, which would deteriorate the fluid stability of the two-phase refrigerant entering the flow guide channel 105 and make it more likely to generate noise.

[0036] In this embodiment, the height of the inner sleeve 102 is greater than the height of the outer sleeve 101, in which case the main inlet 1041 protrudes from the plane formed by the end of the outer sleeve 101 that is not connected to the inner sleeve 102. In some other embodiments, the height of the inner sleeve 102 may be less than the height of the outer sleeve 101, in which case the main inlet 1041 is recessed from the plane formed by the end of the outer sleeve 101 that is not connected to the inner sleeve 102. In some other embodiments, the height of the inner sleeve 102 may be equal to the height of the outer sleeve 101, in which case the main inlet 1041 is flush with the plane formed by the end of the outer sleeve 101 that is not connected to the inner sleeve 102.

[0037] In this embodiment, the diameter d1 of the first through hole 201 is less than 1 / 5 of the diameter D of the main inlet 1041. By utilizing the pressure difference, a portion of the two-phase refrigerant flowing out from the main outlet 1042 can be guided into the flow guiding channel 105 to form a flow guiding fluid, thereby achieving the purpose of noise reduction.

[0038] In this embodiment, the flow guide outlet 1052 includes at least two second through holes 202, which are distributed on the inner sleeve outer wall 1022. Referring to FIG. 5 , the axis of the second through holes 202 and the axis of the main flow passage 104 form an included angle α. Because the flow guide channel 105 is located between the outer sleeve 101 and the inner sleeve 102, in order to realize the two-phase refrigerant in the flow guide channel 105 being guided into the main flow passage 104 through the flow guide outlet 1052, it is necessary to provide at least two second through holes 202 to form the flow guide outlet 1052. Because the flow velocity of the two-phase refrigerant in the flow guide channel 105 is significantly different from that in the main flow channel 104, a buffer area is formed on the inner wall of the main flow channel near the flow guide outlet, which prevents bubbles newly generated by the two-phase refrigerant in the main flow channel from contacting the wall surface, reduces bubble bursting, and further achieves the purpose of noise reduction. The number of second through holes 202 may be 4, 6, 8, 9, 10, etc., and may be evenly distributed on the inner sleeve outer wall 1022 or unevenly distributed on the inner sleeve outer wall 1022.

[0039] 2, in this embodiment, the number of second through holes 202 is four, and they are evenly distributed on the inner sleeve outer wall 1022. The axes of the second through holes 202 are perpendicular to the axis of the main flow path, and the axes of the multiple second through holes 202 are on a single plane. This simplifies the manufacturing process of the second through holes and reduces costs.

[0040] In this embodiment, the diameter d2 of the second through-hole 202 is 1 / 5 or less of the diameter D of the main inlet 1041. By guiding the two-phase refrigerant in the flow guide channel 105 into the main flow path 104 through the flow guide outlet 1052, a buffer area can be formed on the inner wall of the main flow path near the flow guide outlet. This prevents bubbles newly generated by the two-phase refrigerant in the main flow path from contacting the wall, reducing bubble bursting and noise. If the diameter d2 of the second through-hole 202 is too large, the refrigerant may flow in through the second through-hole and out through the first through-hole, potentially resulting in a loss of noise reduction function. If the diameter of the second through-hole 202 is too small, the flow guide fluid may not flow out of the second through-hole, further reducing the noise reduction effect. Therefore, the diameter d2 of the second through-hole 202 must be 0.2 mm or more (if 1 / 5D is less than 0.2 mm, it is set to 0.2 mm).

[0041] In this embodiment, the diameter d1 of the first through-holes 201 must be larger than d2, and the total flow area of ​​the first through-holes is larger than the total flow area of ​​the second through-holes.

[0042] Along the fluid flow direction, the included angle α between the axis of the second through hole 202 and the axis of the main channel 104 is 90° or greater. The case where it is equal to 90° has already been described in the description of FIG. 2 above. When it exceeds 90°, the axes of the second through hole 202 may or may not converge to a single point, and may or may not intersect, as long as the included angle α between the axis of the second through hole 202 and the axis of the main channel 104 exceeds 90°. To achieve the formation of a buffer area on the inner wall of the flow guide outlet close to the main channel and to prevent bubbles newly generated by the two-phase refrigerant in the main channel from contacting the wall surface and thereby achieve the purpose of noise reduction, the included angle α between the axis of the second through hole 202 and the axis of the main channel 104 must be 90° or greater. If the angle α between the axis of the second through hole 202 and the axis of the main flow path 104 is smaller than 90°, the flow direction of the two-phase refrigerant guided by the second through hole 202 into the main flow path 104 will basically be opposite to the flow direction of the two-phase refrigerant in the main flow path 104, and will collide with the two-phase refrigerant in the main flow path 104, which will be detrimental to achieving the purpose of noise reduction.

[0043] In this embodiment, the outer sleeve 101, the inner sleeve 102, and the connecting portion 103 are integrally molded. In some other embodiments, they may be molded separately and then assembled. Integral molding is advantageous for improving the strength of the noise reduction device and extending its service life.

[0044] FIG. 4 shows the structure of the electronic expansion valve of the present disclosure. FIG. 5 shows the mounting position of the electronic expansion valve of the present disclosure in a pipe. The noise reduction assembly may be attached to the electronic expansion valve by screws or welding. The electronic expansion valve 300 includes an inlet pipe 301, a valve housing 302, a valve port 303, and further includes a spindle assembly 401. The noise reduction assembly 100 is attached to the valve port 303 of the electronic expansion valve 300. Two-phase refrigerant flowing from the inlet pipe 301 of the electronic expansion valve 300 passes through the valve port 303 and flows into the main flow path 104 of the noise reduction assembly 100. After flowing out of the noise reduction assembly 100, a portion of the two-phase refrigerant enters the flow guide channel 105 through the flow guide inlet 1051 and flows into the main flow path 104 from the flow guide outlet 1052, forming the flow guide region 304.

[0045] The flow guide area 304 belongs to an independent flow area formed by the noise reduction assembly 100 and the wall surface of the valve housing 302. The pressure of the two-phase refrigerant is different at the top and bottom of the noise reduction assembly 100. Due to the pressure difference, the two-phase refrigerant at the bottom of the noise reduction assembly flows in through the flow guide inlet 1051 and then flows out through the flow guide outlet 1052. That is, a flow guide area is formed in this independent flow area, which prevents the existence of dead zones in the flow at corners and the stagnation of the two-phase refrigerant.

[0046] 5, the noise reduction assembly 100 is mounted between the electronic expansion valve 300 and the outlet pipe 402. The main inlet 1041 of the main flow path 104 of the noise reduction assembly 100 is mounted to the valve port 303 of the electronic expansion valve 300. The spindle assembly 401 is mounted to the valve port 303 and is used to control the flow rate of two-phase refrigerant passing through the valve port. After passing through the valve port opened by the spindle assembly, the two-phase refrigerant flows into the main flow path of the noise reduction assembly 100. As the two-phase refrigerant flows through the front end of the valve port 303 of the electronic expansion valve 300, the pressure of the two-phase refrigerant suddenly drops to (or below) the saturated vapor pressure of the corresponding working conditions, causing cavitation in the two-phase refrigerant and the generation of bubbles. Meanwhile, as the two-phase refrigerant flows out the end of the valve port 303, the pressure of the two-phase refrigerant suddenly rises again, causing the bubbles to burst, which is likely to generate noise. By installing the noise reduction assembly 100 at the valve port 303 of the electronic expansion valve 300, a gradual increase in the flow area along the flow direction of the two-phase refrigerant can be realized, which can avoid the phenomenon of sudden changes in the pressure of the two-phase refrigerant and reduce the probability of bubble bursting.

[0047] The occurrence of bubble bursting is influenced not only by pressure but also by wall roughness. Typically, bubbles gradually form and develop within the two-phase refrigerant, a process that is highly unstable. Therefore, when bubbles come into contact with the wall, they are likely to burst and cause noise. The noise reduction device is installed at the valve port 303 of the electronic expansion valve 300. The two-phase refrigerant at the bottom of the noise reduction device, which flows through the main flow path of the noise reduction device, can be guided to the top of the noise reduction device. The flow velocity is significantly different from that of the two-phase refrigerant in the main flow path. This creates a buffer film between the wall of the noise reduction assembly and the two-phase refrigerant in the main flow path, preventing bubbles from coming into contact with the wall. This reduces bubble bursting and achieves the purpose of noise reduction.

[0048] Furthermore, when the electronic expansion valve is in a heating operation condition, the noise reduction assembly 100 is installed at the valve port 303 of the electronic expansion valve 300 to first realize throttling with a small pressure drop, and then can be throttled again at the main outlet of the noise reduction assembly, thereby avoiding the valve port of the conventional electronic expansion valve forming a wind port (the presence of a bend formed by the end of the valve port and the outlet piping) and causing whistling noise. Therefore, by installing an electronic expansion valve equipped with the noise reduction device 100, it is possible to achieve better noise reduction than an electronic expansion valve without the noise reduction device 100.

[0049] 1, 6 and 7, the present disclosure further provides an electronic expansion valve assembly including an outlet pipe 402, an inner sleeve 102 and a connecting part 103. The outlet pipe 402 has an outlet pipe inner wall. The inner sleeve 102 has an inner sleeve inner wall 1021 and an inner sleeve outer wall 1022. A main flow passage 104 is formed in the inner sleeve inner wall. The main flow passage 104 has a main inlet 1041 and a main outlet 1042 along the fluid flow direction. The connecting part 103 connects the outlet pipe inner wall and the inner sleeve outer wall 1022. Here, the connecting part 103, the outer wall 1022 of the inner sleeve, and the inner wall of the outlet pipe form a flow guide channel 105, which has a flow guide inlet 1051 and a flow guide outlet 1052 along the fluid flow direction, the flow guide inlet 1051 for guiding a portion of the fluid flowing out from the main outlet to the flow guide channel, and the flow guide outlet 1052 for guiding the fluid in the flow guide channel to the main inlet. The connecting part 103 is fixed to the inner wall of the outlet pipe by welding, or the upper end of the inner sleeve is welded to the valve housing.

[0050] In this exemplary embodiment, the noise reduction device proposed in the present disclosure is described as being applied to an electronic expansion valve. Those skilled in the art will easily understand that even if various modifications, additions, substitutions, deletions, or other changes are made to the specific embodiments below in order to apply the related designs of the present disclosure to other types of valves that require noise reduction, these modifications will still fall within the scope of the principles of the noise reduction device proposed in the present disclosure.

[0051] It should be noted here that the noise reduction devices shown in the drawings and described herein are merely illustrative of some of the various noise reduction devices that may employ the principles of the present disclosure, and it should be expressly understood that the principles of the present disclosure are not limited solely to any details of the noise reduction devices shown in the drawings or described herein or to any components of the dispenser.

[0052] The above is a detailed description of some exemplary embodiments of the noise reduction device proposed in the present disclosure. Below, the use process of the noise reduction device and the noise reduction method proposed in the present disclosure will be described by way of example.

[0053] 1 to 5, the noise reduction device proposed in the present disclosure is installed at the valve port of the electromagnetic expansion valve. During use, the two-phase refrigerant passes through the inlet pipe and flows into the electronic expansion valve, and then the flow rate is controlled by the spindle assembly, and the two-phase refrigerant passes through the valve port of the electronic expansion valve and enters the main flow path of the noise reduction assembly. The main flow path has a section where the cross-sectional area gradually increases from the main inlet to the main outlet, so that the flow area along the flow direction of the two-phase refrigerant gradually increases, which can avoid sudden changes in the pressure of the two-phase refrigerant and reduce the probability of bubble bursting.

[0054] After passing through the main flow path of the noise reduction device, the two-phase refrigerant enters the outlet pipe. However, because the diameter of the outlet pipe is larger than the main outlet of the main flow path of the noise reduction device, a bend is formed between the outlet pipe and the main flow path outlet of the noise reduction device. A dead zone is formed at this bend, which makes it easy for bubbles to accumulate and generate noise. In this case, the pressure at the top flow guide outlet of the noise reduction assembly is lower than the pressure at the bottom flow guide inlet. Due to the pressure difference, the two-phase refrigerant located at the bend flows into the bottom flow guide inlet of the noise reduction device, then flows out from the top flow guide outlet and into the main flow path, forming a flow guide area and avoiding the existence of a flow dead zone at the bend and the accumulation of gas.

[0055] After the two-phase refrigerant enters the main flow path through the flow guide inlet, its flow velocity is significantly different from that of the two-phase refrigerant in the main flow path, so a buffer area is formed between the wall surface of the noise reduction assembly and the two-phase refrigerant in the main flow path, which reduces bubble bursting and further reduces noise.

[0056] According to the above-described use process of the noise reduction device and noise reduction method of the present disclosure, the noise reduction device of the present disclosure can achieve noise reduction by avoiding the existence of a flow dead zone and gas stagnation at the corner formed between the outlet pipe and the main flow path outlet of the noise reduction device; by forming a buffer film between the wall surface of the noise reduction assembly and the two-phase refrigerant in the main flow path, it is possible to prevent bubbles from contacting the wall surface, reduce bubble bursting, and achieve further noise reduction; by gradually increasing the flow area along the flow direction of the two-phase refrigerant, it is possible to avoid sudden changes in the pressure of the two-phase refrigerant and reduce the probability of bubble bursting, thereby achieving further noise reduction; by first achieving throttling with a small pressure drop, and then re-throttling at the main outlet of the noise reduction assembly, it is possible to avoid the valve port of a conventional electronic expansion valve forming an air port and causing whistling noise, thereby achieving further noise reduction.

[0057] In summary, the noise reduction device proposed in this disclosure includes an outer sleeve, an inner sleeve, and a connecting part. The outer sleeve has an inner wall, and the inner sleeve has an inner wall and an outer wall, the inner wall of the inner sleeve forming a main flow path through which a two-phase refrigerant passes. The main flow path has a main inlet and a main outlet along the fluid flow direction, and the two-phase refrigerant flows in through the main inlet and out through the main outlet. A main flow path for the two-phase refrigerant is formed between the main inlet and the main outlet. The connecting part connects the inner wall of the outer sleeve and the outer wall of the inner sleeve, and the connecting part and the main outlet are located on the same plane. The flow guide channel has a flow guide inlet and a flow guide outlet along the fluid flow direction, the flow guide inlet for guiding a portion of the fluid flowing out of the main outlet to the flow guide channel, and the flow guide outlet for guiding the fluid in the flow guide channel to the main inlet. The formation of a dead zone at the corner of the main channel outlet prevents bubbles from accumulating and generating noise, and a buffer area is formed on the inner wall of the main channel near the main inlet to reduce bubble bursting and further reduce noise.The main channel has a section where the cross-sectional area gradually increases from the main inlet to the main outlet, which prevents sudden pressure changes in the two-phase refrigerant, reduces the probability of bubble bursting, and achieves gradual throttling, avoiding the creation of air vents and reducing noise.

[0058] It should be understood that the present disclosure is not intended to limit its application to the detailed structure and arrangement of components proposed herein. The present disclosure may have other embodiments and may be embodied and implemented in various forms. The above variations and modifications are included within the scope of the present disclosure. The present disclosure, as disclosed and limited herein, should be understood to extend to all alternative combinations of two or more individual features mentioned or apparent in the specification and / or drawings. All these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described herein illustrate the best modes known for implementing the present disclosure and enable those skilled in the art to utilize the present disclosure.

Claims

1. an outer sleeve having an inner wall; an inner sleeve having an inner sleeve inner wall and an inner sleeve outer wall, the inner sleeve inner wall forming a main flow path, the main flow path having a main inlet and a main outlet along a fluid flow direction; a connection portion connecting the inner wall of the outer sleeve and the outer wall of the inner sleeve; Including, A noise reduction device, wherein the connecting portion, the outer wall of the inner sleeve, and the inner wall of the outer sleeve form a flow guide channel, the flow guide channel having a flow guide inlet and a flow guide outlet along the fluid flow direction, the flow guide inlet for guiding a portion of the fluid flowing out from the main outlet to the flow guide channel, and the flow guide outlet for guiding the fluid in the flow guide channel to the main inlet.

2. The noise reduction device according to claim 1 , wherein the connecting portion and the main outlet are located on the same plane.

3. The noise reduction device of claim 1 , wherein the inner diameter of the inner sleeve increases from the main inlet to the main outlet.

4. The noise reduction device according to claim 3 , wherein the main inlet has a hollow cylindrical shape, and the main outlet has a hollow cylindrical shape or a hollow truncated cone shape.

5. 2. The noise reduction device according to claim 1, which is applied to an electronic expansion valve, the electronic expansion valve being a noise reduction device having a valve port, wherein an inner diameter of one end of the main inlet close to the valve port is the same as an inner diameter of one end of the valve port close to the main inlet.

6. The noise reduction device of claim 1 , wherein the flow guide inlet is provided at the connection portion, the flow guide outlet is provided at the outer wall of the inner sleeve, and the flow guide outlet is located at the main inlet.

7. The noise reduction device according to claim 6 , wherein the flow guide inlet includes at least two first through holes, and axes of the first through holes and the axis of the main flow passage are parallel to each other.

8. The noise reduction device according to claim 7 , wherein the diameter of the first through hole is equal to or less than ⅕ of the diameter of the main inlet.

9. The noise reduction device according to claim 6 , wherein the flow guide outlet includes at least two second through holes, and the axes of the second through holes and the axis of the main flow passage form an included angle.

10. The noise reduction device according to claim 9 , wherein the diameter of the second through hole is equal to or greater than 0.2 mm and equal to or less than ⅕ of the diameter of the main inlet.

11. The noise reduction device according to claim 9 , wherein an included angle between an axis of the second through hole and an axis of the main flow passage is equal to or greater than 90° along the fluid flow direction.

12. The noise reduction device of claim 1 , wherein the outer sleeve, the inner sleeve, and the connecting portion are integrally molded.

13. An electronic expansion valve comprising a noise reduction device according to any one of claims 1 to 12.

14. 14. The noise reduction method for an electronic expansion valve according to claim 13, wherein a main fluid and a flow guide fluid exist in the main flow path, and the flow velocity of the flow guide fluid is lower than the flow velocity of the main fluid.

15. an outlet pipe having an outlet pipe inner wall; an inner sleeve having an inner sleeve inner wall and an inner sleeve outer wall, the inner sleeve inner wall forming a main flow path, the main flow path having a main inlet and a main outlet along a fluid flow direction; a connection portion connecting the inner wall of the outlet pipe and the outer wall of the inner sleeve; Including, an electronic expansion valve assembly, wherein the connecting portion, the outer wall of the inner sleeve, and the inner wall of the outlet pipe form a flow guide channel, the flow guide channel having a flow guide inlet and a flow guide outlet along the fluid flow direction, the flow guide inlet for guiding a portion of the fluid flowing out from the main outlet to the flow guide channel, and the flow guide outlet for guiding the fluid in the flow guide channel to the main inlet.

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