A sound attenuation device and expansion valve

Abstract

The utility model provides a kind of sound attenuation device and expansion valve, belong to thermal management technical field, including sound attenuation component, the sound attenuation component includes at least two interval arrangement sound attenuation part, sound attenuation part has multiple sound attenuation holes, define the diameter or incircle diameter of sound attenuation part as X, along the axial direction of sound attenuation component, define the interval distance between the end face between at least two interval arrangement sound attenuation part shortest distance as H, 4≤X / H≤12. By interval arrangement sound attenuation part, and the ratio range of the diameter X of sound attenuation part and the distance H between interval arrangement sound attenuation part 4 to 12 can further improve the sound attenuation effect of sound attenuation component to fluid medium.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology, specifically to a silencing device and an expansion valve. Background Technology

[0002] When the expansion valve is in use, since the refrigerant is often in a two-phase state of gas-liquid mixture, a large noise will occur when there are large air bubbles in the refrigerant. To eliminate the noise, the average noise level can reach 45dB after setting a silencing component, which has a certain silencing effect. However, if the size of the silencing component is not set properly, the silencing effect will be reduced. Utility Model Content

[0003] The purpose of this invention is to provide a silencing device and an expansion valve, which aims to improve the poor silencing effect of silencing components in refrigerants.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] On the one hand, the present invention provides a noise reduction device, including a noise reduction component. The noise reduction component includes at least two noise reduction parts spaced apart. Each noise reduction part has a plurality of noise reduction holes. The diameter or inscribed circle diameter of the noise reduction part is defined as X. Along the axial direction of the noise reduction component, the distance between the shortest end faces of the at least two spaced noise reduction parts is defined as H, where 4≤X / H≤12.

[0006] According to the silencing device provided by this utility model, the fluid flows through the silencing holes of the silencing part, and the silencing holes uniformly refine the bubbles in the fluid medium to achieve a silencing effect. By setting the silencing parts at intervals, and the ratio of the diameter or inscribed circle diameter of the silencing part X to the axial distance H between the spaced silencing parts is in the range of 4 to 12, the silencing effect of the silencing component on the fluid medium can be further improved.

[0007] On the other hand, the present invention also provides an expansion valve, including the above-mentioned silencing device. The expansion valve has a flow channel, one end of which is a fluid inlet and the other end of which is a fluid outlet. The silencing component is limited and disposed in the flow channel, and the silencing hole is connected to both the fluid inlet and the fluid outlet.

[0008] According to the expansion valve provided by this utility model, since the fluid flows in the flow channel of the expansion valve, and the fluid enters the expansion valve through the fluid inlet and flows out of the expansion valve through the fluid outlet, the silencing device is applied to the expansion valve and limited in the flow channel inside the expansion valve. The silencing hole is connected to the fluid inlet and the fluid outlet, so that the fluid can achieve noise reduction through the silencing device. Furthermore, by limiting the silencing device in the flow channel, the stability of the silencing device can be improved. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural schematic diagram of an expansion valve provided in one embodiment of the present invention;

[0010] Figure 2 This is another three-dimensional structural schematic diagram of the expansion valve provided in one embodiment of the present invention;

[0011] Figure 3 This is another three-dimensional structural schematic diagram of the expansion valve provided in one embodiment of the present invention;

[0012] Figure 4 yes Figure 3 The diagram shows a cross-sectional view of an expansion valve along the AA direction.

[0013] Figure 5 This is a partial cross-sectional view of the silencing portion of an expansion valve provided in one embodiment of the present invention;

[0014] Figure 6 yes Figure 3 The diagram shows a three-dimensional structure of a valve assembly in an expansion valve.

[0015] Figure 7 yes Figure 3 The diagram shows a three-dimensional structure of the valve body in an expansion valve.

[0016] Figure 8 yes Figure 6 The figure shows a cross-sectional view of the valve assembly in the AA direction of an expansion valve.

[0017] Figure 9 yes Figure 8 An enlarged schematic diagram of the valve assembly at position B according to one embodiment;

[0018] Figure 10 yes Figure 8 An enlarged schematic diagram of another structure of the valve assembly at position B provided in one embodiment;

[0019] Figure 11 yes Figure 8 An enlarged schematic diagram of the bearing housing at position B in a valve assembly provided in one embodiment;

[0020] Figure 12 yes Figure 8 An enlarged schematic diagram of the bearing housing at position B in a valve assembly provided in one embodiment;

[0021] Figure 13 yes Figure 8 An enlarged schematic diagram of the bearing housing at position B in a valve assembly provided in one embodiment;

[0022] Figure 14 yes Figure 6 A schematic cross-sectional view of a valve assembly in the CC direction is shown in one embodiment.

[0023] Figure 15 yes Figure 8 An enlarged schematic diagram of the bearing housing at position B in a valve assembly provided in one embodiment;

[0024] Figure 16 This is a schematic diagram of the exploded structure of a silencer device provided in one embodiment of this utility model;

[0025] Figure 17 This utility model provides a curve showing the relationship between noise and the ratio of the diameter to the spacing of the noise-absorbing component;

[0026] Figure 18 This is a partial cross-sectional view of the silencing part of an expansion valve provided in one embodiment of the present invention.

[0027] 100. Valve body; 101. Top surface; 102. Bottom surface; 103. First side surface; 104. Second side surface; 105. Fluid inlet; 106. Fluid outlet; 107. First flow channel; 108. Second flow channel; 110. Mounting cavity; 111. First diameter expansion section; 112. Diameter limiting section; 113. Second diameter expansion section; 120. Silencing channel; 121. Limiting structure; 122. First limiting structure; 123. Second limiting structure; 124. Mixing chamber; 125. Guide section; 126. First surface; 127. Second surface; 128. Third surface; 129. Fourth surface; 130. Impurity channel; 140. Settling tank; 150. Flow channel; 200. Silencing assembly ; 210, First silencing part; 220, Second silencing part; 230, Pad; 240, silencing part; 250, silencing hole; 260, Support ring; 300, Valve assembly; 301, Mounting part; 310, Bearing seat; 311, Valve port flow channel; 312, First inlet; 313, First connecting part; 314, Second connecting part; 315, Valve port; 316, Flow chamber; 317, First flow chamber; 318, Second flow chamber; 320, Valve needle; 330, Gasket; 340, Sleeve; 350, Coil assembly; 360, Magnetic rotor; 370, Lead screw; D1, First direction; D2, Second direction; D3, Third direction; L, Distance; r, Impurity channel radius. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments are further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit its scope.

[0029] The expansion valve is an important control component of the refrigeration system. It uses the energization and de-energization of the coil assembly as the power source for the electronic expansion valve, and controls the axial movement of the valve core through the transmission rod to adjust the valve opening.

[0030] like Figures 1 to 3 As shown, this application provides an expansion valve, including a valve body 100 and a valve assembly 300. The valve assembly 300 is connected to the valve body 100. It should be noted that the valve body 100 can be an independent component that can cooperate with the expansion valve, or it can exist in the form of a flow channel plate in the field of thermal management. The flow channel plate has a fluid channel, and the fluid assembly can be sealed and installed with the flow channel plate. The flow channel in the fluid assembly can communicate with the fluid channel. The fluid assembly can be a solenoid valve assembly, a heat exchanger, or other components. This application does not particularly limit the shape of the valve body 100; for example, the valve body 100 can be a cube, a cylinder, etc. The following description uses a cube-shaped valve body 100 as an example.

[0031] The valve body 100 has a length direction, a width direction, and a height direction. For ease of explanation, the length direction of the valve body 100 is defined as the first direction D1, the width direction of the valve body 100 is defined as the second direction D2, and the height direction of the valve body 100 is defined as the third direction D3, wherein the first direction D1, the second direction D2, and the third direction D3 are all perpendicular to each other.

[0032] The valve body 100 has a top surface 101, a bottom surface 102, a first side surface 103, and a second side surface 104. The top surface 101 and the bottom surface 102 are arranged opposite each other along a third direction D3, and the first side surface 103 and the second side surface 104 are arranged opposite each other along a first direction D1.

[0033] like Figures 1 to 7As shown, the valve body 100 has a flow passage 150, a fluid inlet 105, and a fluid outlet 106. One end of the flow passage 150 is the fluid inlet 105, and the other end is the fluid outlet 106. Fluid enters the expansion valve through the fluid inlet 105 and flows out through the flow passage 150 and exits the expansion valve through the fluid outlet 106. Specifically, the fluid inlet 105 is located on the first side 103 of the valve body 100, and the fluid outlet 106 is located on the second side 104 of the valve body 100. The flow passage 150 has a first flow channel 1... The valve body 100 includes a first flow channel 107 and a second flow channel 108. The fluid inlet 105 is the port of the first flow channel 107, and the fluid outlet 106 is the port of the second flow channel 108. The valve body 100 also has a mounting cavity 110, which is recessed from the top surface 101 along a third direction D3 towards the bottom surface 102. Along the third direction D3, the first flow channel 107 and the second flow channel 108 are located at different positions. In the valve body 100, a portion of the mounting cavity 110 forms a flow passage 150, through which the first flow channel 107 communicates with the second flow channel 108. Optionally, the fluid inlet 105 and the fluid outlet 106 can be respectively located on two other sides of the valve body 100. It is understood that the fluid inlet 105 and the fluid outlet 106 are not necessarily located on two opposite sides of the valve body 100; the flow channel direction can be changed so that the fluid inlet 105 and the fluid outlet 106 are located on mutually perpendicular sides of the valve body 100.

[0034] The valve assembly 300 also includes a valve needle 320, which is at least partially disposed in the mounting cavity 110. A bearing housing 310 is sleeved over the valve needle 320, and the valve needle 320 is configured to be axially movable relative to the bearing housing 310 to control the opening of the valve port passage 311.

[0035] like Figure 7 As shown, the valve body 100 also has a recess 140, which is part of the mounting cavity 110. The recess 140 is recessed from the top surface 101 of the valve body 100 along the third direction D3 toward the bottom surface 102. Optionally, the circumferential wall of the recess 140 has threads, and the valve assembly 300 is connected to the valve body 100 by the threads.

[0036] like Figure 4 As shown, the valve assembly 300 also includes a gasket 330, a sleeve 340, a coil component 350, a magnetic rotor 360, and a lead screw 370. The gasket 330 is fixedly connected to the sleeve 340, which is sleeved over the valve needle 320 and the magnetic rotor 360. The magnetic rotor 360 is limitedly connected to the end of the lead screw 370 away from the valve body 100. The coil component 350 is sleeved over the sleeve 340 and is configured to rotate the magnetic rotor 360. When the coil component 350 is energized, the magnetic rotor 360 drives the lead screw 370 to rotate, thereby causing the valve needle 320 to move axially.

[0037] To reduce noise generated by air bubbles in the refrigerant, this application provides a noise reduction device, including a noise reduction assembly 200. The noise reduction assembly 200 includes at least two spaced-apart noise reduction sections 240, each with a noise reduction hole 250. Multiple noise reduction assemblies 200 can be provided; using multiple assemblies 200 can improve the noise reduction effect. For example, as... Figure 10 As shown, the silencing assembly 200 includes two spaced-apart silencing sections 240, namely a first silencing section 210 and a second silencing section 220. Both the first and second silencing sections 210 and 220 have silencing holes 250. At least one silencing hole 250 of one silencing section 240 communicates with the valve port flow channel 311 through the silencing hole 250 of the other at least one silencing section 240. The silencing section 240 can be circular, square, triangular, polygonal, etc. Furthermore, the first and second silencing sections 210 and 220 are arranged in parallel. Specifically, the first and second silencing sections 210 and 220 are coaxial and spaced apart along the axial direction of the silencing section 240.

[0038] The average inner diameter of the silencing holes 250 is less than 0.15 mm. The first silencing part 210 includes a multi-layer filter screen with silencing holes 250, the multi-layer filter screens are in contact and stacked, and the multi-layer filter screens are between 80 mesh and 100 mesh; or the first silencing part 210 is a plate-shaped structure including silencing holes 250; the second silencing part 220 includes a multi-layer filter screen with silencing holes 250, the multi-layer filter screens are in contact and stacked, or the second silencing part 220 is a plate-shaped structure including silencing holes 250.

[0039] Specifically, the silencing section 240 is a silencing filter screen, which can be formed by sintering multiple layers of 80-mesh to 100-mesh filter screens in contact and stacked arrangement. The filter screen has silencing holes 250, the average inner diameter of which is less than 0.15mm. The pore size within this range effectively refines air bubbles and reduces noise. For example, it can be formed by sintering two, three, or more layers of filter screens. Optionally, the silencing section 240 can be a plate-like structure with silencing holes 250. The perforated plate structure facilitates welding of the silencing part 240 to the bearing seat 310. It can be understood that the silencing assembly 200 can be composed entirely of filter screens, or entirely of plate structures with silencing holes 250, or a combination of silencing parts 240 formed by sintering multiple layers of stacked filter screens and silencing parts 240 with plate structures having silencing holes 250 to form the silencing assembly 200. That is, the first silencing part 210 is a filter screen, and the second silencing part 220 is a porous plate structure. Both the first silencing section 210 and the second silencing section 220 have small-diameter silencing holes 250. The silencing holes 250 uniformly refine the air bubbles in the medium, achieving a silencing effect. Optionally, the first silencing section 210 is located upstream of the second silencing section 220. The average aperture of the silencing holes 250 in the second silencing section 220 is less than or equal to the average aperture of the silencing holes 250 in the first silencing section 210. This makes it difficult for fluid to pass through the first silencing section 210 and exit through the second silencing section 220, thereby increasing the pressure of the fluid between the first silencing section 210 and the second silencing section 220 and improving the silencing effect on the fluid.

[0040] To further improve the noise reduction effect of the silencer, the diameter or inscribed circle diameter of the silencer section 240 is defined as X. Along the axial direction of the silencer assembly 200, the shortest distance between the end faces of the spaced-apart silencer sections 240 is defined as H, where 4 ≤ X / H ≤ 12. Experiments have shown that a mixing chamber 124 is formed between the spaced-apart silencer sections 240. The mixing chamber 124 improves the noise reduction effect by pressurizing the fluid and increasing the fluid's residence time within it. However, when the diameter of the silencer section 240 is constant, a smaller spacing distance H reduces the pressurization effect of the mixing chamber 124 and the fluid's residence time within it, resulting in a relative decrease in noise reduction. Conversely, a larger spacing distance H increases the overall structure's volume and cost. Furthermore, after a certain value, the improvement in noise reduction effect becomes limited. Figure 5 and Figure 17As shown, setting the X / H value between 4 and 12 is beneficial to improving the noise reduction effect of the silencer. Specifically, 7 ≤ X / H ≤ 11 can further reduce the noise generated by the refrigerant, keeping the noise level below 30 dB. The diameter X of the silencer 240 can be selected based on the diameter of the location where the silencer 240 will be installed in the expansion valve. Therefore, to control the overall size and cost while achieving good noise reduction, an optimal value is 2.5 cm ≤ X ≤ 10 cm, 0.8 cm ≤ H ≤ 1.25 cm, for example, X = 7.2 cm, H = 0.8 cm. The silencer assembly 200 is installed within the flow passage 150 of the expansion valve, for example... Figure 4 and Figure 7 As shown, the noise reduction assembly 200 can be installed in the first flow channel 107, the second flow channel 108, or other locations.

[0041] For example, the silencer 240 can be installed on the valve assembly 300. Figure 4 and Figure 7 As shown, at least a portion of the valve assembly 300 is disposed within the mounting cavity 110, such as Figure 6 As shown, the valve assembly 300 includes a mounting portion 301, which is at least partially disposed within the mounting cavity 110, and the valve assembly 300 is sealed to the valve body 100. The mounting portion 301 has a first inlet 312, a valve port flow channel 311, and a silencing channel 120. The flow channel 150 includes the valve port flow channel 311 and the silencing channel 120. The first inlet 312 communicates with both the silencing channel 120 and the silencing hole 250 through the valve port flow channel 311. The silencing assembly 200 is at least partially positioned within the silencing channel 120. It should be noted that the mounting portion 301 can be composed of one or more components. When the mounting portion 301 is composed of multiple components, the first inlet 312, the valve port flow channel 311, and the silencing channel 120 can be located on different components.

[0042] When the mounting part 301 is a single component, for example, the mounting part 301 includes a bearing housing 310, such as... Figures 9 to 11 As shown, the bearing housing 310 has a first inlet 312, a valve port flow channel 311, an impurity channel 130, and a silencing channel 120. Along the fluid flow direction, the silencing channel 120 is located downstream of the first inlet 312 and the valve port flow channel 311. The first inlet 312 communicates with the silencing channel 120 and the impurity channel 130 through the valve port flow channel 311. Fluid can flow through the mounting cavity 110, the first inlet 312, the valve port flow channel 311, the impurity channel 130, and the silencing channel 120. The silencing channel 120 can be recessed from the end face of the bearing housing 310 near the bottom surface 102 along a third direction D3 towards the top surface 101. Of course, by changing the fluid inlet and outlet, the fluid can also flow in the opposite direction.

[0043] like Figure 10 and Figure 16As shown, the spaced-apart silencing sections 240 have a mixing chamber 124, which is connected to the silencing hole 250. Specifically, the first silencing section 210 and the second silencing section 220 are spaced-apart to form the mixing chamber 124. The mixing chamber 124 can increase the time for the fluid to silencing, which is beneficial to improving the elimination of air bubbles in the fluid. The first silencing section 210 is located upstream of the second silencing section 220. The inner diameter of the mixing chamber 124 is defined as R. The diameter or inscribed circle diameter X1 of the first silencing section 210 is defined, and the diameter or inscribed circle diameter X2 of the second silencing section 220 is defined. If the inner diameter of the mixing chamber 124 is too small, the mixing chamber 124 will become too small. Since the volume of 4 is relatively small, the flow rate of fluid flowing into the mixing chamber 124 is low. To improve the efficiency of fluid silencing, 2.5cm≤R≤10 and 0.5≤R / X1≤1 are used. For example, R=2.5cm and X1=5cm, or R=6.6cm and X1=7.2cm, or R=10cm and X1=10cm. It should be noted that the diameters or inscribed circle diameters X1 and X2 of the first silencing part 210 and the second silencing part 220 are included in the range of X, and X1 and X2 may not be the same.

[0044] To facilitate the forming of the mixing cavity 124 and improve the stability of the muffler 240 installation, the muffler assembly 200 further includes at least one pad 230. The pad 230 is positioned between at least one muffler 240 and another muffler 240, and the inner wall surface and / or outer wall surface of the pad 230 define at least a portion of the mixing cavity 124. When the pad 230 is provided, to ensure that the pad 230 can support the first muffler 240 and improve its stability, R / X1 < 1. This means that the inner diameter of the pad 230 is smaller than the diameter or inscribed circle diameter X1 of the first muffler 240. Optionally, the pad 230 is annular. Since the pad 230 is a hollow annular structure, the refrigerant can pass through the middle of the pad 230. The hollow design of the pad 230 is conducive to the flow of refrigerant. Optionally, in order to improve the ease of assembly of the pad 230, the middle of the pad 230 is broken, that is, the pad 230 is not a continuous annular structure but a broken structure.

[0045] Optionally, to further improve the noise reduction effect of the mixing chamber 124 on the fluid, 1 ≤ R / X2, for example, R = 2.5cm, X2 = 2.5cm, or R = 6.6cm, X2 = 3.3cm. By reducing the diameter or inscribed circle diameter of the second noise reduction part 220 to be smaller than the inner diameter of the mixing chamber 124, the time the fluid spends in the mixing chamber 124 can be further increased to improve the noise reduction effect. When the pad 230 is not provided, R / X2 can be equal to 1; when the pad 230 is provided, such as... Figure 18As shown, X1 can be greater than X2, in which case 1 < R / X2; however, if the diameter or inscribed circle diameter of the second silencing part 220 is too small, it will not be conducive to the discharge of fluid. Therefore, the effective discharge of fluid should also be ensured, so R / X2 ≤ 3.

[0046] like Figure 11 As shown, the bearing housing 310 includes a flow cavity 316 and a silencing channel 120. The inner diameter of the flow cavity 316 is less than or equal to the inner diameter of the silencing channel 120. The flow cavity 316 is located on the side of the silencing channel 120 near the valve port flow channel 311, and the valve port flow channel 311 is connected to the silencing channel 120 through the flow cavity 316. Both the refrigerant and impurities in the refrigerant will flow through the flow cavity 316. Then, a portion of the refrigerant flows through the silencing channel 120, while the impurities in the refrigerant will not flow out of the silencing channel 120 through the silencing hole 250. Since at least a portion of the impurity channel 130 penetrates the wall of the flow cavity 316, and the impurity channel 130 is located on the side of the silencing channel 120 near the valve port flow channel 311, the impurities can be discharged from the bearing housing 310 through the impurity channel 130 in the flow cavity 316. Therefore, the flow cavity 316 is located before the silencing channel 120 along the fluid flow direction, which is conducive to the smooth discharge of impurities in the refrigerant.

[0047] like Figure 11 As shown, the flow chamber 316 includes a first flow chamber 317 and a second flow chamber 318. The inner diameter of the first flow chamber 317 gradually increases from the end of the flow chamber 316 near the valve port flow channel 311 toward the direction near the silencer channel 120. This arrangement is beneficial to reduce the vaporization caused by the pressure drop of the refrigerant. The second flow chamber 318 is located between the first flow chamber 317 and the silencer channel 120. The inner diameter of the second flow chamber 318 is less than or equal to the inner diameter of the silencer channel 120, and at least part of the impurity channel 130 penetrates the wall of the bearing housing 310.

[0048] Optional, such as Figures 9 to 13 As shown, one port of the impurity channel 130 is located on the inner wall surface of the bearing housing 310, and the other port is located on the outer wall surface of the bearing housing 310. At least part of the impurity channel 130 penetrates the wall of the bearing housing 310. In order to facilitate the discharge of impurities in the refrigerant from the bearing housing 310 and prevent them from accumulating on the muffler assembly 200, the impurity channel 130 is closer to the valve port flow channel 311 than the muffler assembly 200 in the axial direction of the muffler channel 120.

[0049] Furthermore, to facilitate the discharge of impurities from the bearing housing 310, the impurity channel 130 is arranged around the centerline of the second flow cavity 318. Along the axial direction of the second flow cavity 318, the distance between the centerline of the impurity channel 130 and the end face of the silencer assembly 200 near the valve port flow channel 311 is less than or equal to the radius of the impurity channel 130. Figure 10As shown, the distance between the centerline of the impurity channel 130 and the end face of the silencer assembly 200 near the valve port flow channel 311 is L, and the radius of the impurity channel 130 is r, where L is less than or equal to r. This arrangement allows impurities remaining on the silencer assembly 200 to more easily enter the impurity channel 130 and thus be discharged from the bearing housing 310. Optionally, as... Figure 9 As shown, the difference between the distance L between the centerline of the impurity channel 130 and the end face of the silencing component 200 near the valve port flow channel 311 and the radius of the impurity channel 130 is less than or equal to the diameter of the impurity channel 130, i.e., Lr≤2r. It can be understood that along the axial section of the silencing channel 120, there is a certain distance between the end face of the silencing component 200 near the valve port flow channel 311 and the farthest end of the impurity channel 130 in the radial direction and near the silencing component 200. This is beneficial for axially limiting the silencing component 200. The distance does not need to prevent impurities from entering the impurity channel 130. The number of impurity channels 130 is at least one, and can be two, three, four, or more.

[0050] Furthermore, to ensure that most of the refrigerant flows through the muffler assembly 200 to eliminate air bubbles and improve noise reduction, the muffler assembly 200 has multiple muffler holes 250. The total flow cross-sectional area of ​​the impurity channels 130 is smaller than the total flow cross-sectional area of ​​the muffler holes 250. When there are multiple impurity channels 130, the sum of the flow cross-sections of the multiple impurity channels 130 is the total flow cross-sectional area of ​​the impurity channels 130. The total flow cross-sectional area of ​​the muffler holes 250 refers to the total flow cross-sectional area of ​​the muffler assembly 200 at the end near the valve port flow channel 311. A larger flow cross-sectional area can reduce flow resistance, causing the fluid to move in the direction of lower flow resistance. Therefore, more refrigerant flows through the muffler assembly 200, improving the muffler effect.

[0051] To facilitate the installation of the noise reduction assembly 200 in the bearing housing 310, the noise reduction assembly 200 is axially limited, such as... Figure 11As shown, the inner diameter of the second flow cavity 318 is smaller than the inner diameter of the silencing channel 120. The inner wall surface of the second flow cavity 318 has a first surface 126, and the inner wall surface of the silencing channel 120 has a second surface 127. The first surface 126 is located on the side of the second surface 127 near the valve port flow channel 131. The second surface 127 is recessed relative to the first surface 126 in a direction away from the center line of the silencing channel 120. The second surface 127 is limited by the outer periphery of the silencing assembly 200. The first surface 126 has at least one port of at least part of the impurity channel 130. By setting the first surface 126 and the second surface 127, the inner wall surfaces of the silencing channel 120 have different inner diameters. The first surface 126 and the second surface 127 form a stepped structure. The wall surface between the first surface 126 and the second surface 127 in the radial direction limits the silencing assembly 200, which improves the convenience and stability of the installation of the silencing assembly 200. Optionally, while the second surface 127 is positioned to limit the outer periphery of the silencing component 200, a gap is formed between the second surface 127 and the outer periphery of the silencing component 200, thereby providing a portion of the impurity channel 130.

[0052] like Figure 12 As shown, the bearing housing 310 includes a first connecting portion 313, a second connecting portion 314, and a valve port portion 315. The valve port portion 315 has a valve port flow channel 311, which is located between the first connecting portion 313 and the second connecting portion 314. A first inlet 312 is located in the first connecting portion 313. A flow cavity 316 and a silencing channel 120 are located in the second connecting portion 314. Along the third direction D3, the silencing channel 120 is recessed from the end of the second connecting portion 314 away from the valve port flow channel 311 towards the first connecting portion 313. The first connecting portion 313 and the second connecting portion 314 are integrally formed, which facilitates the manufacturing of the bearing housing 310. Optionally, the first connecting portion 313 and the second connecting portion 314 are separate structures. It can be understood that the valve port flow channel 311 and the silencing channel 120 are arranged in the third direction D3, and the silencing channel 120 is closer to the bottom surface 102.

[0053] like Figures 9 to 11 As shown, the silencing component 200 is fixedly installed within the silencing channel 120, making the silencing component 200 more secure. The fixed installation method includes, for example, interference fit, snap-fit, welding, threaded connection, etc., to prevent the silencing component 200 from shifting within the silencing channel 120 and affecting the silencing effect. This also improves the tightness of the connection between the silencing component 200 and the valve body 100 and reduces the misalignment of the silencing component 200 caused by fluid impact.

[0054] When assembling the expansion valve, the silencing component 200 can be installed into the silencing channel 120 first, and then the valve component 300 can be connected to the valve body 100, with at least a portion of the valve component 300 extending into the mounting cavity 110.

[0055] The silencing hole 250 is connected to the valve port flow channel 311. After passing through the valve port flow channel 311, the fluid flows to the silencing assembly 200 to eliminate noise. It is understood that the silencing assembly 200 can also be located upstream of the valve port flow channel 311, for example, within the first flow channel 107. The first inlet 312 can be connected to the silencing hole 250 through the valve port flow channel 311. In order to allow some impurities to flow from one axial side of the silencing assembly 200 to the other axial side of the silencing assembly 200 through the impurity channel 130, and to reduce the situation where impurities in the fluid remain on the silencing assembly 200 after passing through it and cause blockage, the flow cross-sectional area of ​​the impurity channel 130 is set to be larger than the flow cross-sectional area of ​​a single silencing hole 250, so that impurities that cannot pass through the silencing hole 250 can be discharged from the bearing housing 310 through the impurity channel 130.

[0056] Optionally, the silencing assembly 200 has an impurity channel 130 between a portion of the wall surface of the defining silencing channel 120, such as... Figures 13 to 15 As shown, the impurity channel 130 connects the fluid channels at both ends of the silencing assembly 200. It can be understood that there is a gap between the circumferential wall of the silencing assembly 200 and the wall defining the silencing channel 120, allowing impurities to pass through. Therefore, this gap can be at least a portion of the impurity channel 130. Specifically, as... Figure 13 and Figure 14 As shown, the inner diameter of the second flow cavity 318 is equal to the inner diameter of the silencing channel 120. A portion of the impurity channel 130 penetrates the wall of the second flow cavity 318. Another portion of the impurity channel 130 is located between the silencing assembly 200 and a portion of the wall surface defining the silencing channel 120. Specifically, the inner wall surface of the silencing channel 120 has a third surface 128 and a fourth surface 129. The fourth surface 129 is recessed relative to the third surface 128 in a direction away from the center line of the silencing channel 120. The third surface 128 is positioned relative to the outer periphery of the silencing assembly 200, which improves the stability of the silencing assembly 200. Another portion of the impurity channel 130 is located between the fourth surface 129 and the outer periphery of the silencing assembly 200. A gap is formed between the fourth surface 129 and the silencing assembly 200, allowing impurities to pass through.

[0057] Optionally, the inner wall surface of the silencing channel 120 includes a limiting structure 121. The silencing component 200 is limited and connected to the limiting structure 121. The limiting structure 121 protrudes from the inner wall surface of the silencing channel 120 toward the centerline of the silencing channel 120, which is beneficial to the formation of the impurity channel 130 and reduces manufacturing costs. The limiting structure 121 includes a third surface 128, and the inner wall surface of the silencing channel 120 has a fourth surface 129. The limiting structures 121 are spaced apart in the circumferential direction of the silencing channel 120, and the gaps between the spaced limiting structures 121 constitute at least a portion of the impurity channel 130. Optionally, the limiting structure 121 protrudes from the inner wall surface of the silencing channel 120 toward the centerline of the silencing channel 120. An impurity channel 130 is formed in the limiting structure 121. The sidewall of the limiting structure 121 includes a third surface 128 and a fourth surface 129. The third surface 128 is limited by the outer peripheral surface of the silencing part 240. The fourth surface 129 is recessed from the third surface 128 away from the centerline of the silencing channel 120. An impurity channel 130 is formed between the fourth surface 129 and the outer peripheral surface of the silencing part 240. The sidewall of the limiting structure 121 defines a portion of the wall surface of the silencing channel 120. The fourth surface 129 can have a different diameter or a different center than the third surface 128 and can be cut from the third surface 128 away from the centerline of the silencing channel 120, creating a gap between the fourth surface 129 and the silencing part 240, allowing impurities to pass through.

[0058] Optional, such as Figure 15 As shown, the limiting structure 121 is an annular structure spaced apart around the silencing channel 120 and protruding towards the center line of the silencing channel 120. Along the axial direction of the silencing channel 120, there is an impurity channel 130 between the limiting structure 121 and the outer peripheral surface of the silencing part 240. Optionally, the impurity channel 130 can also be provided in the limiting structure 121. For example, the limiting structure 121 includes a first limiting structure 122 and a second limiting structure 123. The first limiting structure 122 and the second limiting structure 123 are spaced apart and staggered along the axial direction of the silencing channel 120. The first limiting structure 122 and the second limiting structure 123 are annular and protrude towards the axis of the silencing channel 120. Along the axial direction of the silencing channel 120, the impurity channel 130 passes through the first limiting structure 122 and the second limiting structure 123. The projections of the impurity channel 130 located in the first limiting structure 122 and the impurity channel located in the second limiting structure 123 in the axial direction do not overlap at least partially. This non-overlapping projection configuration improves the fluid mixing effect, helps to buffer the fluid, further refines air bubbles in the fluid, and reduces noise. Optionally, to further improve the mixing effect, the inner diameter of the second limiting structure 123 is smaller than the inner diameter of the first limiting structure 122.

[0059] like Figures 9 to 15As shown, to improve the ease and stability of installing the muffler assembly 200, the second connecting portion 314 further includes a guide portion 125. The guide portion 125 is located at the end of the second connecting portion 314 away from the valve port flow channel 311, and the inner diameter of the guide portion 125 gradually decreases towards the valve port flow channel 311, forming an inclined surface that facilitates the installation of the muffler assembly 200. To improve the stability of the muffler assembly 200 installation, the outer periphery of the muffler portion 240 away from the valve port flow channel 311 is welded, threaded, or snap-fitted to the bearing seat 310. Optionally, the muffler assembly 200 also includes a support ring 260. The support ring 260 is located at the end of the muffler assembly 200 away from the valve port flow channel 311. The support ring 260 is at least partially located within the muffler channel 120. The support ring 260 is welded to the bearing housing 310. Specifically, the support ring 260 is welded to the second connecting portion 314, and the end of the support ring 260 near the valve port flow channel 311 abuts against the muffler portion 240. This arrangement improves the stability of the installation of the muffler assembly 200 and the bearing housing 310. Specifically, the support ring 260 has a hollow annular structure, which facilitates the flow of refrigerant. Optionally, the diameter of the pad 230 is approximately the same as the diameter of the support ring 260. This arrangement reduces the shear force exerted by the support ring 260 on the muffler assembly 200 during assembly, which is beneficial to the stability of the muffler assembly 200.

[0060] When the valve assembly 300 is installed in the valve body 100, a gap exists between the port of the impurity channel 130 located on the outer wall of the bearing seat 310 and the inner wall of the valve body 100 along the radial direction of the mounting cavity 110. This allows impurities to be smoothly discharged from the bearing seat 310 and enter the valve body 100. It can be understood that the port of the impurity channel 130 located on the outer wall of the bearing seat 310 communicates with the second flow channel 108, and the flow cross-section of the second flow channel 108 is larger than the flow cross-section of the port of the impurity channel 130, thereby allowing impurities to be discharged from the valve body 100. Specifically, as shown... Figure 7 As shown, the mounting cavity 110 has a first expansion section 111, a limiting section 112, and a second expansion section 113. Along the axial direction of the mounting cavity 110, the first expansion section 111 is located at one end of the limiting section 112 near the first flow channel 107. The valve assembly 300 is sealed to the wall of the limiting section 111. The second expansion section 113 is located at one end of the limiting section 112 near the second flow channel 108. The bearing seat 310 is sealed to the wall of the limiting section 112. The valve body 100 has a gap between the inner wall of the second expansion section 113 and the port of the impurity channel 130 located on the outer wall of the bearing seat 310. The flow cross-section of the gap is larger than the flow cross-sectional area of ​​the silencer hole 250. The port of the impurity channel 130 located on the outer wall of the bearing seat 310 communicates with the second flow channel 108. Optionally, the diameter of the second expansion section 113 is larger than the diameter of the limiting section 112, which is beneficial for the discharge of impurities.

[0061] In one embodiment, when installing the electronic expansion valve, firstly, a muffler assembly 200 is installed into the muffler channel 120 of the bearing housing 310, for example by press fitting; then, a pad 230 is installed into the muffler channel 120 until the pad 230 contacts the muffler assembly 200; then, another muffler assembly 200 is installed into the muffler channel 120; then, at least a portion of the support ring 260 is installed into the muffler channel 120 until the support ring 260 contacts the muffler assembly 200; then, the support ring 260 is welded to the bearing housing 310; finally, the valve needle 320 of the valve assembly 300 and the bearing housing 310 are inserted into the mounting cavity 110.

[0062] It should be noted that the above-described embodiments only illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be pointed out that those skilled in the art can make several modifications without departing from the concept of this utility model, and these modifications all fall within the protection scope of this utility model.

Claims

1. A noise reduction device, characterized in that: The device includes a noise reduction assembly (200), which includes at least two spaced noise reduction sections (240), each of which has a plurality of noise reduction holes (250). The diameter or inscribed circle diameter of the noise reduction section (240) is defined as X. Along the axial direction of the noise reduction assembly (200), the distance between the end faces of the at least two spaced noise reduction sections (240) with the shortest distance is defined as H, where 4 ≤ X / H ≤ 12.

2. The silencing device according to claim 1, characterized in that: The silencing part (240) includes a first silencing part (210) and a second silencing part (220). Both the first silencing part (210) and the second silencing part (220) have the silencing hole (250). The first silencing part (210) and the second silencing part (220) are coaxial and spaced apart along the axial direction of the silencing part (240), with 7≤X / H≤11; 2.5cm≤X≤10cm, and 0.8cm≤H≤1.25cm.

3. The silencing device according to claim 2, characterized in that: A mixing cavity (124) is provided between the first silencing part (210) and the second silencing part (220). The mixing cavity (124) is connected to the silencing hole (250). The first silencing part (210) is located upstream of the second silencing part (220). The inner diameter of the mixing cavity (124) is defined as R. The diameter or inscribed circle diameter X1 of the first silencing part (210) is defined. The diameter or inscribed circle diameter X2 of the second silencing part (220) is defined. 2.5cm≤R≤10; 0.5≤R / X1≤1, and / or 1≤R / X2≤3.

4. The silencing device according to claim 2, characterized in that: The first silencing part (210) is located upstream of the second silencing part (220), and the average aperture of the silencing hole (250) located in the second silencing part (220) is less than or equal to the average aperture of the silencing hole (250) located in the first silencing part (210).

5. The silencing device according to claim 3, characterized in that: The average inner diameter of the silencing hole (250) is less than 0.15 mm. The first silencing part (210) includes a multi-layer filter screen with the silencing hole (250), the multi-layer filter screen is in contact and stacked, and the multi-layer filter screen is between 80 mesh and 100 mesh; or the first silencing part (210) is a plate-shaped structure including the silencing hole (250); the second silencing part (220) includes a multi-layer filter screen with the silencing hole (250), the multi-layer filter screen is in contact and stacked, or the second silencing part (220) is a plate-shaped structure including the silencing hole (250).

6. The silencing device according to claim 5, characterized in that: The silencing assembly (200) further includes at least one pad (230), with the pad (230) between at least one of the silencing portions (240) and another silencing portion (240), the inner wall surface of the pad (230) defining at least a portion of the mixing cavity (124).

7. An expansion valve, characterized in that: The silencing device includes any one of claims 1 to 6, wherein the expansion valve has a flow passage (150), one end of the flow passage (150) is a fluid inlet (105), the other end of the flow passage (150) is a fluid outlet (106), the silencing component (200) is limitedly disposed in the flow passage (150), and the silencing hole (250) is connected to both the fluid inlet (105) and the fluid outlet (106).

8. The expansion valve according to claim 7, characterized in that: The expansion valve further includes a valve assembly (300) and a valve body (100), both of which have the flow passage (150), and the silencing assembly (200) is limited to the valve assembly (300) and / or the valve body (100).

9. The expansion valve according to claim 8, characterized in that: The valve assembly (300) includes a mounting part (301), which has a first inlet (312), a valve port flow channel (311), and a silencing channel (120). The flow channel (150) includes the valve port flow channel (311) and the silencing channel (120). The first inlet (312) is connected to the silencing channel (120) and the silencing hole (250) through the valve port flow channel (311). The silencing assembly (200) is at least partially limited in the silencing channel (120).

10. The expansion valve according to claim 9, characterized in that: The mounting part (301) also has a flow cavity (316), and the flow channel (150) further includes the flow cavity (316). The flow cavity (316) is located on the side of the silencing channel (120) near the valve port flow channel (311), and the valve port flow channel (311) is connected to the silencing channel (120) through the flow cavity (316). The inner diameter of the flow cavity (316) is less than or equal to the inner diameter of the silencing channel (120). The mounting part (301) also has an impurity channel (130). At least a portion of the impurity channel (130) penetrates the wall of the flow cavity (316). The impurity channel (130) is located on the side of the silencing channel (120) near the valve port flow channel (311), and the flow cross-sectional area of ​​a single impurity channel (130) is greater than the flow cross-sectional area of ​​a single silencing hole (250).

11. The expansion valve according to claim 10, characterized in that: The mounting portion (301) includes a bearing housing (310), the bearing housing (310) includes a first connecting portion (313), a second connecting portion (314) and a valve port portion (315), the valve port portion (315) is located between the first connecting portion (313) and the second connecting portion (314), the valve port portion (315) has the valve port flow channel (311), the first inlet (312) is located in the first connecting portion (313), the flow cavity (316) and the silencer channel (120) are located in the second connecting portion (314), the first connecting portion (313) and the second connecting portion (314) are integrally formed, the valve assembly (300) also includes a valve needle (320), the valve needle (320) is at least partially disposed in the first connecting portion (313), and the valve needle (320) is configured to be axially movable relative to the bearing housing (310) to control the opening degree of the valve port flow channel (311).

12. The expansion valve according to claim 11, characterized in that: The silencing assembly (200) further includes a support ring (260) located at one end of the silencing assembly (200) away from the valve port flow channel (311). The support ring (260) is at least partially located within the silencing channel (120). The support ring (260) is welded to the bearing seat (310), and the end of the support ring (260) near the valve port flow channel (311) abuts against the silencing portion (240) away from the valve port flow channel (311).

13. The expansion valve according to claim 12, characterized in that: The valve body (100) further includes a first flow channel (107), a second flow channel (108), and a mounting cavity (110). The flow passage (150) includes the first flow channel (107), the second flow channel (108), and the mounting cavity (110). The silencing assembly (200) is limited to at least one of the first flow channel (107), the second flow channel (108), and the mounting cavity (110). The bearing seat (310) is located in the mounting cavity (110), and the valve assembly (300) is sealed to the valve body (100). The first flow channel (107) can communicate with the silencing channel (120) through the valve port flow channel (311). The silencing channel (120) communicates with the mounting cavity (110). The first flow channel (107) and the second flow channel (108) are connected through the mounting cavity (110).

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