WO2023241144A1

WO2023241144A1 - Noise reduction device, electronic expansion valve, noise reduction method, and electronic expansion valve assembly

Info

Publication number: WO2023241144A1
Application number: PCT/CN2023/081989
Authority: WO
Inventors: 原亚东; 赵晓飞; 陈其功; 张克鹏
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2022-06-14
Filing date: 2023-03-16
Publication date: 2023-12-21
Also published as: CN117267455A

Abstract

Provided in the present disclosure are a noise reduction device, an electronic expansion valve, an assembly, and a noise reduction method. The noise reduction device comprises an outer sleeve, an inner sleeve, and a connecting portion. The outer sleeve is provided with an outer sleeve inner wall, the inner sleeve is provided with an inner sleeve inner wall and an inner sleeve outer wall, a main flow channel is formed in the inner sleeve inner wall, and the main flow channel is provided with a main flow inlet and a main flow outlet in a fluid flow direction, and the connecting portion connects the outer sleeve inner wall to the inner sleeve outer wall. The connecting portion, the inner sleeve outer wall and the outer sleeve inner wall form a flow guide channel, the flow guide channel is provided with a flow guide inlet and a flow guide outlet in the fluid flow direction, the flow guide inlet is used for guiding part of a fluid flowing from the main flow outlet to flow into the flow guide channel, and the flow guide outlet is used for guiding the fluid in the flow guide channel to flow to the main flow inlet. By means of the above structure, the present disclosure can prevent bubble retention caused by flow dead zones being formed at corners around the main flow outlet, and can reduce bubble breakage, thereby achieving the aim of noise reduction.

Description

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

cross reference

This disclosure claims priority to the Chinese patent disclosure with the publication number 202210673355.1 and the name "Noise Reduction Device, Electronic Expansion Valve and Noise Reduction Method" submitted on June 14, 2022. The entire content of this Chinese patent disclosure is fully cited. Incorporated herein.

Technical field

The present disclosure relates to the field of electronic expansion valves, and specifically, to an electronic expansion valve with a noise reduction device and a noise reduction method.

Background technique

Electronic expansion valve is a control device used in refrigeration equipment. At present, electronic expansion valves are increasingly used in small and medium-sized refrigeration equipment. The most common application is in household air conditioners, where electrical signal control is used to ensure the stable and efficient operation of the air conditioning system.

Electronic expansion valves generally consist of inlet pipes, valve housings, valve needle components and outlet pipes. The refrigerant flows into the valve cavity (internal area of the valve housing) from the inlet pipe, is throttled by the valve port, and then flows out from the outlet pipe. Since the refrigerant often cavitates and generates bubbles when flowing through the valve port, the formation and collapse of bubbles will produce noise; in addition, whistling is likely to occur when the vapor-containing refrigerant flows through the valve port at high speed. Voice. The above noise is usually caused by unreasonable valve port structure design.

Existing noise reduction devices all partially optimize the structure, such as arranging thin plate components with multiple small holes on the refrigerant flow path to subdivide the bubbles in the two-phase refrigerant to reduce noise; another example is setting up barriers. The flow wall divides the two-phase refrigerant to reduce noise and other methods. However, this kind of optimization usually only works under specific working conditions, and the noise reduction effect is not obvious. It also requires installation requirements and is complicated to install, which is not conducive to improving noise reduction efficiency.

public content

According to one aspect of the present disclosure, a noise reduction device is provided. The noise reduction device includes 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, and the inner sleeve inner wall forms a main flow channel, and the main flow channel has a main flow path along the fluid flow direction. Inlet and main flow outlet; the connecting portion connects the inner wall of the outer sleeve and the outer wall of the inner sleeve. The connecting part, the outer wall of the inner sleeve and the inner wall of the outer sleeve form a drainage channel. The drainage channel has a drainage inlet and a drainage outlet along the direction of fluid flow. The drainage inlet is used to transfer the Part of the fluid flowing out through the main flow outlet is directed into the drainage channel, and the drainage outlet is used to guide the fluid in the drainage channel to the main flow inlet.

According to one embodiment of the present disclosure, the connecting portion and the main flow outlet are located on the same plane.

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

According to one embodiment of the present disclosure, the main flow inlet is in the shape of a hollow cylinder, and the main flow outlet is in the shape of a hollow cylinder or a hollow truncated cone.

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

According to one embodiment of the present disclosure, the diversion inlet is provided on the connecting part, the diversion outlet is provided on the outer wall of the inner sleeve, and the diversion outlet is located at the main flow inlet.

According to one embodiment of the present disclosure, the drainage inlet includes at least two first through holes, and the axis of the first through holes is parallel to the axis of the main channel.

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

According to one embodiment of the present disclosure, the drainage outlet includes at least two second through holes, and the axis of the second through hole forms an angle with the axis of the main channel.

According to one embodiment of the present disclosure, the diameter of the second through hole is greater than or equal to 0.2 mm and less than or equal to 1/5 of the diameter of the main inlet.

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

According to one embodiment of the present disclosure, the outer sleeve, the inner sleeve and the connecting part are integrally formed.

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

According to another aspect of the present disclosure, there is provided a noise reduction method for an electronic expansion valve as above. There is a main flow fluid and a diversion fluid in the main flow channel, and the flow speed of the diversion fluid is lower than the flow speed of the main flow fluid.

According to yet another aspect of the present disclosure, an electronic expansion valve assembly is provided, including an outlet pipe, an inner sleeve, and a connecting portion. The outlet pipe has an inner wall of the outlet pipe; the inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall, and the inner sleeve inner wall forms a main flow channel, and the main flow channel has a main flow inlet and a main flow outlet along the fluid flow direction; connection The inner wall of the outlet pipe is connected to the inner wall of the inner sleeve; wherein, the connecting portion, the outer wall of the inner sleeve and the inner wall of the outlet pipe form a drainage channel, and the drainage channel has a drainage inlet and drainage outlet, the diversion inlet is used to guide part of the fluid flowing out through the main flow outlet into the diversion channel, and the diversion outlet is used to guide the fluid in the diversion channel to the main flow inlet.

It can be seen from the above technical solutions that the advantages and positive effects of the noise reduction device proposed in this disclosure are:

The noise reduction device proposed in this disclosure includes an outer sleeve, an inner sleeve and a connecting part. The outer sleeve has an outer sleeve inner wall, and the inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall. The inner sleeve inner wall forms a main flow channel, and the main flow channel allows the two-phase refrigerant to pass through. The main flow channel has a main flow inlet and a main flow outlet along the fluid flow direction. The two-phase refrigerant flows in from the main flow inlet and flows out from the main flow outlet. A main flow channel of the two-phase refrigerant is formed between the main flow inlet and the main flow outlet. The connecting part connects the inner wall of the outer sleeve and the outer wall of the inner sleeve. That is to say, at the position of the main flow outlet, the outer sleeve and the inner sleeve are connected to form an annular surface with the main flow outlet as the center. The connecting part, the outer wall of the inner sleeve and the inner wall of the outer sleeve form a drainage channel, which is mainly used to guide a part of the two-phase refrigerant flowing out from the main flow outlet back into the main flow channel. The diversion channel has a diversion inlet and a diversion outlet along the fluid flow direction. The diversion inlet is used to guide part of the fluid flowing out through the main flow outlet into the diversion channel. The diversion outlet is used to guide the fluid in the diversion channel to the main flow inlet. That is to say, the diversion inlet is used for the guided two-phase refrigerant to enter the diversion channel, and the diversion outlet is used for the guided two-phase refrigerant to flow out of the diversion channel and enter the main flow channel. The setting of the above-mentioned diversion channel can avoid the formation of a dead zone at the corner of the main channel outlet, resulting in bubble retention and noise, and can form a layer of buffer area on the inner wall of the main channel close to the main inlet to reduce bubble bursting and achieve noise reduction. .

The above and other objects, features and advantages of the present disclosure will be more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

Description of the drawings

The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

Figure 1 is a schematic three-dimensional structural diagram of an embodiment of the noise reduction device of the present disclosure.

FIG. 2 is a longitudinal cross-sectional view of FIG. 1 .

Figure 3 is a schematic structural diagram of another embodiment of the noise reduction device of the present disclosure.

Figure 4 is a schematic structural diagram of the electronic expansion valve of the present disclosure.

Figure 5 is a schematic diagram of the installation position of the electronic expansion valve of the present disclosure in the pipeline.

Figure 6 is a schematic diagram of another embodiment of the electronic expansion valve of the present disclosure.

FIG. 7 is a partial structural diagram of the noise reduction device in FIG. 6 .

The reference symbols are explained as follows:

100. Noise reduction device;

101. Outer sleeve;

1011. Inner wall of outer sleeve;

102. Inner sleeve;

1021. Inner wall of inner sleeve;

1022. Outer wall of inner sleeve;

103.Connection part;

104. Main channel;

1041.Mainstream entrance;

1042. Mainstream export;

105. Drainage channel;

1051. Drainage entrance;

1052. Drainage outlet;

201. First through hole;

202. Second through hole;

300. Electronic expansion valve (part);

301.Import pipeline;

302. Valve housing;

303. Valve port;

304. Drainage area;

401. Valve needle assembly;

402. Exit pipe.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Although relative terms, such as “upper” and “lower” are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience. For example, according to the drawings, Orientation of the example described. It will be understood that if the icon device were turned upside down, components described as "on top" would become components as "on bottom". Other relative terms, such as "top", "bottom", etc. also have similar meanings. When a structure is "on" another structure, it may mean A certain structure is integrally formed on another structure, or it means that a certain structure is "directly" provided on other structures, or it means that a certain structure is "indirectly" provided on other structures through another structure.

The terms "a", "an", "the" and "said" are used to indicate the existence of one or more elements/components/etc.; the terms "include" and "have" are used to indicate an open-ended inclusion. means and implies that there may be further elements/components/etc. in addition to the listed elements/components/etc.; the terms "first", "second", etc. are used only as markers and not as to the quantity of their object limit.

As shown in FIG. 1 , the noise reduction device 100 of the present disclosure includes an outer sleeve 101 , an inner sleeve 102 and a connecting part 103 . The outer sleeve 101 has an outer sleeve inner wall 1011, the inner sleeve 102 has an inner sleeve inner wall 1021 and an inner sleeve outer wall 1022, and the inner sleeve inner wall 1021 forms the main channel 104. The main channel 104 allows two-phase refrigerant to pass through. The main channel 104 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 and flows out from the main outlet 1042 after passing through the main channel 104. A main flow channel 104 is formed between the main flow inlet 1041 and the main flow outlet 1042 for the passage of two-phase refrigerant.

The connecting part 103 connects the outer sleeve inner wall 1011 and the inner sleeve outer wall 1022, and the connecting part 103 is located on the same plane as the main flow outlet 1042. At the position of the main flow outlet 1042, the outer sleeve 101 and the inner sleeve 102 are connected to form a The main flow outlet 1042 is an annular surface at the center, and this annular surface is the connecting portion 103 . The connection part 103, the outer wall of the inner sleeve 1022 and the inner wall of the outer sleeve 1011 form a guide channel 105. The guide channel 105 is mainly used to guide a part of the two-phase refrigerant flowing out of the main outlet 1042 of the main channel 104, close to the connection part 103, back to the main stream. Road 104.

The diversion channel 105 has a diversion inlet 1051 and a diversion outlet 1052 along the flow direction of the two-phase refrigerant. The diversion inlet 1051 is used to guide part of the two-phase refrigerant fluid flowing out through the main outlet 1042 into the diversion channel 105. The diversion outlet 1052 is used to The two-phase refrigerant fluid in the diversion channel 105 is guided to the main inlet 1041 . The diversion inlet 1051 is used for the diverted two-phase refrigerant to enter the diversion channel 105 , and the diversion outlet 1052 is used for the diverted two-phase refrigerant to flow out of the diversion channel 105 and enter the main channel 104 . The setting of the above-mentioned diversion channel can avoid the formation of a dead zone at the corner of the main channel outlet, resulting in bubble retention and noise, and can form a layer of buffer area on the inner wall of the main channel close to the main inlet to reduce bubble bursting and achieve noise reduction. .

In this embodiment, the inner diameter of the inner sleeve 102 increases from the main flow inlet 1041 to the main flow outlet 1042 . It can increase the flow area of the two-phase refrigerant along the flow direction in the noise reduction device of the present disclosure, reduce factors that induce bubble rupture, avoid sudden changes in the pressure of the two-phase refrigerant that cause bubble rupture, and thereby achieve the purpose of noise reduction. Purpose.

In this embodiment, the main flow inlet 1041 is in the shape of a hollow cylinder. Setting the main flow inlet 1041 in the shape of a hollow cylinder can adjust the flow state of the two-phase refrigerant that enters the main channel 104 of the noise reduction device 100 through the rear end of the valve port. It should be adjusted to avoid the sudden rise in pressure when the two-phase refrigerant flows out through the end of the valve port, causing a large number of bubbles to burst and causing noise. The main flow outlet 1042 has a hollow cylindrical shape, which enables the two-phase refrigerant to pass through a section of the flow channel with a gradually increasing flow area, and the overall state tends to be stable, so that the two-phase refrigerant flowing out from the main flow outlet 1042 will not cause large disturbances. and impact phenomena. In some other embodiments, the main flow outlet 1042 can also be in the shape of a hollow truncated cone (as shown in Figure 3), which can also achieve a gradual increase in the flow area of the two-phase refrigerant along the flow direction and avoid sudden changes in the pressure of the two-phase refrigerant. phenomenon, reducing the probability of bubble bursting, thereby achieving the purpose of noise reduction.

In this embodiment, the drainage inlet 1051 is provided on the connection part 103. The drainage inlet 1051 is mainly used to guide a part of the two-phase refrigerant flowing out from the main flow outlet 1042 into the drainage channel 105. Therefore, the drainage inlet 1051 needs to be provided on the connection part. part 103 to facilitate the drainage of a part of the two-phase refrigerant flowing out of the main flow outlet 1042. The drainage outlet 1052 is provided on the outer wall 1022 of the inner sleeve and communicates with the main channel 104 through the inner wall 1021 of the inner sleeve. The diversion outlet 1052 is located at the main flow inlet 1041 and is used to guide the two-phase refrigerant in the diversion channel 105 into the main flow channel 104. Since the flow rate of the two-phase refrigerant in the diversion channel 105 is different from the two-phase refrigeration in the main flow channel 104, If the flow rates of the refrigerants are greatly different, a buffer area will be formed between the inner sleeve inner wall 1022 near the main inlet 1041 and the two-phase refrigerant flowing in the main channel 104 to avoid the two-phase refrigerant flowing in the main channel 104. The newly generated bubbles contact the inner wall 1022 of the inner sleeve, thereby reducing bubble bursting and achieving noise reduction.

As shown in Figure 2, in the noise reduction device 100 of the present disclosure, the drainage inlet 1051 on the connecting part 103 includes at least two first through holes 201. Since the drainage channel 105 is located between the outer sleeve 101 and the inner sleeve 102, It is necessary to provide at least two first through holes 201 to form the diversion inlet 1051 in order to guide a part of the two-phase refrigerant flowing out of the main flow outlet 1042 into the diversion channel 105 to avoid bubbles caused by dead zones at the corners of the main flow outlet. Retention creates noise. The number of the first through holes 201 may be four, six, eight, nine, ten, etc., and may be evenly distributed on the connecting part 103 or unevenly distributed on the connecting part 103 . The axis of the first through hole 201 is parallel to the axis of the main flow channel 104, mainly to prevent the two-phase refrigerant entering the guide channel 105 from the first through hole 201 from having an unstable impact on the wall of the guide channel, thereby causing it to enter the guide channel. The two-phase refrigerant of 105 has poor fluid stability and is more likely to produce noise.

In this embodiment, the height of the inner sleeve 102 is greater than the height of the outer sleeve 101 . At this time, the main flow 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 also be smaller than the height of the outer sleeve 101 , in which case the main inlet 1041 is recessed in the plane formed by the end of the outer sleeve 101 that is not connected to the inner sleeve 102 . In other embodiments, the height of the inner sleeve 102 may also be equal to the height of the outer sleeve 101 , in which case the main flow 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 .

In this embodiment, the diameter d1 of the first through hole 201 is less than or equal to 1/5 of the diameter D of the main inlet 1041 . It can be achieved that a part of the two-phase refrigerant flowing out of the main flow outlet 1042 is guided into the diversion channel 105 by utilizing the pressure difference to form a diversion fluid to achieve the purpose of noise reduction.

In this embodiment, the drainage outlet 1052 includes at least two second through holes 202, and the at least two second through holes 202 are distributed on the outer wall 1022 of the inner sleeve. Referring to FIG. 5 , the axis of the second through hole 202 and the axis of the main channel 104 form an included angle α. Since the drainage channel 105 is located between the outer sleeve 101 and the inner sleeve 102, at least two second through holes 202 need to be provided to form the drainage outlet 1052 in order to guide the two-phase refrigerant in the drainage channel 105 through the drainage outlet 1052. It is introduced into the main channel 104. Since the flow rate of the two-phase refrigerant in the main channel 105 is greatly different from the flow rate of the two-phase refrigerant in the main channel 104, a layer of buffer will be formed on the inner wall of the main channel close to the drainage outlet. area, it can prevent the new bubbles of the two-phase refrigerant in the main channel from coming into contact with the wall surface, reduce bubble rupture, and achieve the purpose of noise reduction again. The number of the second through holes 202 can also be four, six, eight, nine, ten, etc., and can be evenly distributed on the inner sleeve outer wall 1022, or unevenly distributed on the inner sleeve outer wall 1022. .

In this embodiment, as shown in FIG. 2 , the number of the second through holes 202 is four, and they are evenly distributed on the outer wall 1022 of the inner sleeve. The axis of the second through hole 202 is perpendicular to the axis of the main channel, and there are multiple second through holes 202 . The axes of the second through holes 202 are on a plane. Such a design can simplify the processing technology of the second through hole and reduce costs.

In this embodiment, the diameter d2 of the second through hole 202 is less than or equal to 1/5 of the diameter D of the main inlet 1041 . It is possible to guide the two-phase refrigerant in the diversion channel 105 through the diversion outlet 1052 into the main channel 104, thereby forming a layer of buffer area on the inner wall of the main channel close to the diversion outlet, which can avoid the two-phase refrigerant in the main channel from leaking. The new bubbles are in contact with the wall surface, reducing bubble bursting and reducing noise. If the diameter d2 of the second through hole 202 is larger, the refrigerant may flow in from the second through hole and flow out through the first through hole, thereby causing the noise reduction device to lose its function; if the diameter of the second through hole 202 is too small, This makes it difficult for the drainage fluid to flow out from the second through hole, thereby reducing its noise reduction effect. Therefore, the diameter d2 of the second through hole 202 needs to be greater than or equal to 0.2mm (when 1/5D is less than 0.2mm, take 0.2mm).

In this embodiment, the diameter d1 of the first through hole 201 needs to be greater than d2, and the total flow area of the first through hole 201 is greater than the total flow area of the second through hole.

Along the fluid flow direction, the angle α between the axis of the second through hole 202 and the axis of the main channel 104 is greater than or equal to 90°. The case of equal to 90° has been explained above in the description of FIG. 2 . For situations greater than 90°, at this time, the axes of the second through hole 202 may or may not intersect at one point, and may or may not intersect, as long as the axis of the second through hole 202 and the main channel 104 are The angle α between the axes can be greater than 90°. The angle α between the axis of the second through hole 202 and the axis of the main channel 104 needs to be greater than or equal to 90°, so that a layer of buffer area can be formed on the inner wall of the main channel close to the drainage outlet to avoid two-phase refrigeration in the main channel. The new bubbles of the agent come into contact with the wall surface to achieve the purpose of noise reduction. If the angle α between the axis of the second through hole 202 and the axis of the main channel 104 is less than 90°, then the flow direction of the two-phase refrigerant flowing into the main channel 104 through the second through hole 202 will be consistent with the main channel. The flow direction of the two-phase refrigerant in 104 is basically opposite, which will have an impact on the two-phase refrigerant in the main channel 104, which is not conducive to the purpose of noise reduction.

In this embodiment, the outer sleeve 101, the inner sleeve 102 and the connecting part 103 are integrally formed. In other embodiments, they can also be assembled after separate molding. Integrated molding is helpful to improve the strength of the noise reduction device and extend its service life.

Figure 4 shows the structure of the electronic expansion valve of the present disclosure. Figure 5 shows the installation position of the electronic expansion valve of the present disclosure in the pipeline. The noise reduction component can be installed on the electronic expansion valve by threading or welding. The electronic expansion valve 300 includes an inlet pipe 301, a valve housing 302, a valve port 303, and a valve needle assembly 401. The noise reduction component 100 is installed at the valve port 303 of the electronic expansion valve 300. The inlet pipe 301 of the electronic expansion valve 300 flows into the two-phase refrigerant through the valve port 303 and flows into the main channel 104 of the noise reduction component 100, and then flows out of the noise reduction component 100. Finally, part of the two-phase refrigerant will flow into the drainage channel 105 through the drainage inlet 1051, and flow into the main channel 104 from the drainage outlet 1052, thereby forming the drainage area 304.

The drainage area 304 is an independent flow area formed by the walls of the noise reduction component 100 and the valve housing 302. The two-phase refrigerants at the upper end and bottom of the noise reduction component 100 have different pressures. Driven by the pressure difference, the two phases at the bottom of the noise reduction component 100 are moved. The phase refrigerant flows in through the drainage inlet 1051 and then flows out through the drainage outlet 1052. That is, a drainage area is formed in this independent flow area, which avoids the existence of corner flow dead zones and the retention of the two-phase refrigerant.

As can be seen from FIG. 5 , the noise reduction assembly 100 is installed between the electronic expansion valve 300 and the outlet pipe 402 . The main flow inlet 1041 of the main channel 104 of the noise reduction assembly 100 is installed at the valve port 303 of the electronic expansion valve 300 , and the valve needle The component 401 is disposed at the valve port 303 and is used to control the flow of two-phase refrigerant through the valve port. The two-phase refrigerant flows into the main channel of the noise reduction assembly 100 after passing through the valve port opened by the valve needle assembly. When the two-phase refrigerant flows through the head end of the valve port 303 of the electronic expansion valve 300, the pressure of the two-phase refrigerant suddenly drops. (or lower than) the saturated vapor pressure under corresponding working conditions, the two-phase refrigerant cavitates and generates bubbles. When the two-phase refrigerant flows out through the tail end of the valve port 303, the pressure of the two-phase refrigerant suddenly rises, causing the bubbles to burst, which easily induces the generation of noise. Disposing the noise reduction component 100 at the valve port 303 of the electronic expansion valve 300 can gradually increase the flow area of the two-phase refrigerant along the flow direction, avoid sudden changes in the pressure of the two-phase refrigerant, and reduce the probability of bubble bursting. .

In addition, the occurrence of bubble bursting is not only affected by pressure, but also by wall roughness. Generally, Bubbles gradually form and develop inside the two-phase refrigerant. The process is extremely unstable. When they escape to the wall, they are prone to rupture, which can easily induce noise. The noise reduction device is arranged at the valve port 303 of the electronic expansion valve 300, and can guide the two-phase refrigerant at the bottom of the noise reduction device that flows out through the main channel of the noise reduction device to the top of the noise reduction device. Since its flow rate is different from the main flow of the noise reduction device, The flow rates of the two-phase refrigerant in the channel are quite different, which will form a buffer film between the wall surface of the noise reduction component and the two-phase refrigerant in the main channel to prevent bubbles from contacting the wall surface, reduce bubble rupture, and achieve success again. Noise reduction purpose.

In addition, when the electronic expansion valve is in heating mode, the noise reduction component 100 is disposed at the valve port 303 of the electronic expansion valve 300, which can first realize throttling with a small pressure drop, and then throttle again at the main flow outlet of the noise reduction component. The flow can prevent the traditional electronic expansion valve from forming an air vent (the existence of the corner formed by the tail of the valve port and the outlet pipe), causing whistling sounds. Therefore, an electronic expansion valve equipped with the noise reduction device 100 can achieve further noise reduction than an electronic expansion valve without the noise reduction device 100 .

As shown in FIG. 1 , FIG. 6 and FIG. 7 , the present disclosure also provides an electronic expansion valve assembly, including an outlet pipe 402 , an inner sleeve 102 and a connecting part 103 . The outlet duct 402 has an outlet duct inner wall. The inner sleeve 102 has an inner sleeve inner wall 1021 and an inner sleeve outer wall 1022. The inner sleeve inner wall forms a main flow channel 104. The main flow channel 104 has a main flow inlet 1041 and a main flow outlet 1042 along the fluid flow direction. The connecting part 103 connects the inner wall of the outlet pipe and the outer wall 1022 of the inner sleeve. Among them, the connecting part 103, the outer wall of the inner sleeve 1022 and the inner wall of the outlet pipe form a drainage channel 105. The drainage channel 105 has a drainage inlet 1051 and a drainage outlet 1052 along the fluid flow direction. The drainage inlet 1051 is used to guide part of the fluid flowing out through the main outlet. It flows into the drainage channel, and the drainage outlet 1052 is used to guide the fluid in the drainage channel to the main flow inlet. The connecting part 103 and the inner wall of the outlet pipe are fixed by welding, or the upper end of the inner sleeve is welded to the valve housing.

In this exemplary embodiment, the noise reduction device proposed by the present disclosure is explained by taking its application to an electronic expansion valve as an example. Those skilled in the art can easily understand that in order to apply the relevant designs of the present disclosure to other types of valves that require noise reduction, various modifications, additions, substitutions, deletions or other changes can be made to the following specific embodiments. , these changes are still within the scope of the principles of the noise reduction device proposed in this disclosure.

It should be noted at this point that the noise reduction devices illustrated in the drawings and described in this specification are but a few examples of the many types of noise reduction devices in which the principles of the present disclosure can be employed. It should be clearly understood that the principles of the present disclosure are in no way limited to any details of the noise reduction device or any components of the dispenser shown in the drawings or described in this specification.

The above is a detailed description of several exemplary embodiments of the noise reduction device proposed in the present disclosure. The following will provide an exemplary description of the use process and the noise reduction method of the noise reduction device proposed in the present disclosure.

With reference to Figures 1 to 5, the noise reduction device proposed by the present disclosure is installed at the valve port of the electromagnetic expansion valve. During use, after the two-phase refrigerant flows into the electronic expansion valve through the inlet pipe, the valve needle assembly controls the flow through the valve port of the electronic expansion valve and enters the main channel of the noise reduction assembly. Since the cross-sectional area of the main channel flows from the main flow inlet to the main flow outlet There is a section that gradually increases in the direction, so that the flow area of the two-phase refrigerant gradually increases along the flow direction, thereby avoiding sudden changes in the pressure of the two-phase refrigerant and reducing the probability of bubble bursting.

After passing through the main channel of the noise reduction device, the two-phase refrigerant enters the outlet pipe. Since the outlet pipe has a larger diameter than the main outlet of the main channel of the noise reduction device, a corner will be formed between the outlet pipe and the main channel outlet of the noise reduction device. , this corner is easy to form a dead zone to cause bubble retention, thereby generating noise. At this time, the pressure at the drainage outlet at the top of the noise reduction component is lower than the pressure at the drainage inlet at the bottom. Driven by the pressure difference, the pressure at the corner is The two-phase refrigerant flows in through the drainage inlet at the bottom of the noise reduction device, and then flows out through the drainage outlet at the top into the main flow channel, forming a drainage area, which avoids the existence of corner flow dead zones and vapor retention.

After the two-phase refrigerant enters the main channel through the inlet, because its flow rate is greatly different from the flow rate of the two-phase refrigerant in the main channel, a layer will be formed between the wall surface of the noise reduction component and the two-phase refrigerant in the main channel. Buffer area to reduce bubble bursting and achieve noise reduction.

Through the above-mentioned usage process and noise reduction method of the noise reduction device of the present disclosure, it can be concluded that the noise reduction device of the present disclosure can avoid the corner flow dead zone formed at the corner between the outlet pipe and the main channel outlet of the noise reduction device. To achieve noise reduction, it can form a buffer film between the wall surface of the noise reduction component and the two-phase refrigerant in the main channel to avoid contact between bubbles and the wall surface, and reduce bubble rupture to achieve further noise reduction. ; It can gradually increase the flow area of the two-phase refrigerant along the flow direction, avoid sudden changes in the pressure of the two-phase refrigerant, and reduce the probability of bubble bursting to achieve further noise reduction; it can first achieve throttling with a small pressure drop, and then Re-throttling the main flow outlet of the noise reduction component can prevent the traditional electronic expansion valve from forming an air outlet and causing a whistling sound to achieve further noise reduction.

To sum up, the noise reduction device proposed in this disclosure includes an outer sleeve, an inner sleeve and a connecting part. The outer sleeve has an outer sleeve inner wall, and the inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall. The inner sleeve inner wall forms a main flow channel, and the main flow channel allows the two-phase refrigerant to pass through. The main flow channel has a main flow inlet and a main flow outlet along the fluid flow direction. The two-phase refrigerant flows in from the main flow inlet and flows out from the main flow outlet. A main flow channel of the two-phase refrigerant is formed between the main flow inlet and the main flow outlet. The connecting part connects the inner wall of the outer sleeve and the outer wall of the inner sleeve, and is located on the same plane as the main flow outlet. The diversion channel has a diversion inlet and a diversion outlet along the fluid flow direction. The diversion inlet is used to guide part of the fluid flowing out through the main flow outlet into the diversion channel. The diversion outlet is used to guide the fluid in the diversion channel to the main flow inlet. It can avoid the formation of dead zones at the corners of the main flow channel outlet, resulting in bubble retention and noise, and can form a layer of buffer area on the inner wall of the main flow channel close to the main flow inlet to reduce bubble bursting and achieve noise reduction. mainstream The cross-sectional area gradually increases from the mainstream inlet to the mainstream outlet, which can avoid sudden changes in the pressure of the two-phase refrigerant and reduce the probability of bubble bursting. It can also achieve graded throttling, avoid the generation of air vents, and achieve noise reduction.

It should be understood that the present disclosure is not limited in its application to the detailed structure and arrangement of components set forth in this specification. The disclosure is capable of other embodiments and of being implemented and carried out in various ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It will be understood that the disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or apparent in the text and/or drawings. All of these different combinations constitute alternative aspects of the disclosure. The embodiments described in this specification illustrate the best mode known for carrying out the disclosure, and will enable those skilled in the art to utilize the disclosure.

Claims

A noise reduction device, characterized by: including:

The outer sleeve has an inner wall of the outer sleeve;

The inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall. The inner sleeve inner wall forms a main flow channel, and the main flow channel has a main flow inlet and a main flow outlet along the fluid flow direction;

The connecting part connects the inner wall of the outer sleeve and the outer wall of the inner sleeve;

Wherein, the connecting part, the outer wall of the inner sleeve and the inner wall of the outer sleeve form a drainage channel, the drainage channel has a drainage inlet and a drainage outlet along the direction of fluid flow, and the drainage inlet is used to divert the main flow through the Part of the fluid flowing out of the outlet is directed into the drainage channel, and the drainage outlet is used to guide the fluid in the drainage channel to the main inlet.
The noise reduction device of claim 1, wherein the connecting portion and the main flow outlet are located on the same plane.
The noise reduction device of claim 1, wherein the inner diameter of the inner sleeve increases from the main flow inlet to the main flow outlet.
The noise reduction device of claim 3, wherein the main flow inlet is in the shape of a hollow cylinder, and the main flow outlet is in the shape of a hollow cylinder or a hollow truncated cone.
The noise reduction device as claimed in claim 1, applied to an electronic expansion valve having a valve port; characterized in that: the inner diameter of one end of the main flow inlet close to the valve port is the same as the inner diameter of the end of the valve port close to the main flow inlet. The inner diameter at one end is the same.
The noise reduction device according to claim 1, characterized in that: the diversion inlet is provided on the connecting part, the diversion outlet is provided on the outer wall of the inner sleeve, and the diversion outlet is located on the main flow inlet. at.
The noise reduction device of claim 6, wherein the inlet includes at least two first through holes, and the axis of the first through hole is parallel to the axis of the main channel.
The noise reduction device according to claim 7, wherein the diameter of the first through hole is less than or equal to 1/5 of the diameter of the main flow inlet.
The noise reduction device of claim 6, wherein the drainage outlet includes at least two second through holes, and the axis of the second through hole forms an angle with the axis of the main channel.
The noise reduction device of claim 9, wherein the diameter of the second through hole is greater than or equal to 0.2 mm and less than or equal to 1/5 of the diameter of the main inlet.
The noise reduction device according to claim 9, characterized in that: along the direction of fluid flow, the second passage The angle between the axis of the hole and the axis of the main channel is greater than or equal to 90°.
The noise reduction device according to claim 1, wherein the outer sleeve, the inner sleeve and the connecting part are integrally formed.
An electronic expansion valve, characterized by having the noise reduction device according to any one of claims 1-12.
A noise reduction method for an electronic expansion valve as claimed in claim 13, characterized in that: there is a main flow fluid and a diversion fluid in the main flow channel, and the flow speed of the diversion fluid is lower than the flow speed of the main flow fluid.
An electronic expansion valve assembly, characterized by: including:

The outlet pipe has an inner wall of the outlet pipe;

The inner sleeve has an inner sleeve inner wall and an inner sleeve outer wall. The inner sleeve inner wall forms a main flow channel, and the main flow channel has a main flow inlet and a main flow outlet along the fluid flow direction;

A connecting portion, connecting the inner wall of the outlet pipe and the outer wall of the inner sleeve;

Wherein, the connecting part, the outer wall of the inner sleeve and the inner wall of the outlet pipe form a drainage channel, the drainage channel has a drainage inlet and a drainage outlet along the direction of fluid flow, and the drainage inlet is used to divert the main flow outlet Part of the outflowed fluid is guided into the drainage channel, and the drainage outlet is used to guide the fluid in the drainage channel to the main inlet.