Refrigerator-freezer and method of manufacturing the same

Abstract

This invention relates to a refrigeration and freezing device and its manufacturing method. The refrigeration and freezing device includes: a shell, with a foamed layer inside the shell, the foamed layer at least surrounding a device cavity; a throttling evaporation assembly, comprising a capillary tube, an expander tube, and an evaporator connected in sequence, the expander tube having a larger internal cross-sectional area than the capillary tube, the expander tube being at least partially covered with low-frequency sound-absorbing material and embedded within the foamed layer, and the evaporator being disposed within the device cavity. In the refrigeration and freezing device of this invention, on the one hand, the expander tube can reduce pressure, thereby reducing or weakening the ejection energy and thus reducing ejection noise; on the other hand, the low-frequency sound-absorbing material can isolate low-frequency noise and reduce vibration, and the foamed material in the foamed layer can eliminate high-frequency noise. Therefore, the refrigeration and freezing device of this invention has noise reduction and vibration reduction effects. Furthermore, in this invention, part of the throttling device is installed within the foamed layer, which saves space in the evaporator compartment and facilitates the installation of the throttling device.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to a refrigeration and freezing device and its manufacturing method. Background Technology

[0002] Refrigerator noise is a crucial performance indicator. At the connection between the capillary tube and the evaporator, the sudden increase in the pipe's inner diameter causes a pressure surge. As the refrigerant is ejected at high speed from the capillary tube, a phase change occurs, generating numerous bubbles. As the pressure decreases, these bubbles enlarge and eventually burst, producing ejection noise. This ejection noise increases the overall noise level of the refrigerator, resulting in a poor user experience. Furthermore, the capillary tube is installed inside the evaporator compartment. Due to the limited space within the evaporator compartment, especially the narrow space between the evaporator and the compartment walls, capillary tube installation is extremely inconvenient. Unreliable capillary tube installation exacerbates its own vibration, further increasing noise. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a refrigeration and freezing apparatus and a method for manufacturing the same to overcome or at least partially solve the above problems, thereby reducing the ejection noise of the refrigeration and freezing apparatus and solving the problem of inconvenient installation of throttling devices in the prior art.

[0004] On one hand, the present invention provides a freezing and refrigeration apparatus, comprising:

[0005] A housing, wherein a foamed layer is formed inside the housing, and the foamed layer at least surrounds a device cavity;

[0006] A throttling evaporation assembly includes a capillary tube, an expansion tube, and an evaporator connected in sequence. The cross-sectional area of ​​the expansion tube is larger than that of the capillary tube. The expansion tube is at least partially covered with low-frequency sound-absorbing material and embedded in the foaming layer. The evaporator is disposed in the equipment cavity.

[0007] Optionally, a transition pipe is further connected in series between the expansion tube and the evaporator. The cross-sectional area of ​​the transition pipe is larger than that of the capillary tube but smaller than that of the refrigerant tube of the evaporator.

[0008] The low-frequency noise-absorbing material also covers the transition tube.

[0009] Optionally, at least two expansion tubes are connected in series within the capillary to divide the capillary into at least two segments; and

[0010] The low-frequency noise-absorbing material covers all of the expansion tubes and is continuously disposed between at least the farthest ends of the two expansion tubes.

[0011] Optionally, the low-frequency noise-absorbing material is formed into a flexible roll, which is wrapped around the expansion tube to form a sleeve-shaped noise-absorbing package.

[0012] Optionally, the capillary tube and the expansion tube form a throttling device, and the position of the throttling device connected to the evaporator and / or the end away from the expansion tube is exposed from the foaming layer.

[0013] Optionally, at least two of the expansion tubes and / or at least two of the capillary segments have different tube lengths and / or different internal cross-sectional areas.

[0014] Optionally, the capillary tube and the expander tube are connected in series to form a first throttling device; and

[0015] The throttling evaporation assembly further includes a second throttling device arranged in parallel with the first throttling device, wherein the second throttling device does not have the expansion tube and is located inside or outside the foaming layer.

[0016] On the other hand, the present invention also provides a method for manufacturing a freezing and refrigeration apparatus, comprising:

[0017] A noise reduction assembly is formed by covering the expansion tube with low-frequency sound-absorbing material, wherein the expansion tube is used to connect the capillary tube and the evaporator, and the cross-sectional area inside the expansion tube is larger than the cross-sectional area inside the capillary tube.

[0018] After the noise reduction component is installed in the foamed area inside the housing of the refrigeration and freezing device, foaming material is filled into the foamed area and foaming is performed so that the noise reduction component is embedded in the foamed layer of the foamed area.

[0019] Optionally, the noise reduction component is installed in the foamed area within the housing of the refrigeration and freezing unit, including:

[0020] The capillary tube, the noise reduction component, and the evaporator are connected in sequence to form a throttling evaporation component;

[0021] The throttling evaporation assembly is installed in place within the housing.

[0022] Optionally, the method of forming a noise reduction component by covering the expansion tube with low-frequency sound-absorbing material includes:

[0023] The low-frequency noise-absorbing material is wound around the expansion tube and fixed by binding. The low-frequency noise-absorbing material is formed into a flexible roll and wrapped around the expansion tube to form a sleeve-shaped noise-absorbing package.

[0024] In the refrigeration apparatus of the present invention, on the one hand, an expansion tube is provided between the evaporator and the capillary tube, and the cross-sectional area of ​​the expansion tube is larger than that of the capillary tube. This expansion tube can reduce pressure, thereby reducing or weakening the ejection energy and thus reducing ejection noise. On the other hand, the expansion tube is at least partially covered with low-frequency sound-absorbing material and embedded in the foaming layer. The low-frequency sound-absorbing material can isolate part of the expansion tube from the foaming layer, and can isolate low-frequency noise and reduce vibration. The foaming material in the foaming layer can eliminate high-frequency noise. Therefore, the refrigeration apparatus of the present invention has the effect of noise reduction and vibration reduction. In addition, due to the larger space of the foaming layer, compared with the prior art where the capillary tube is installed in the evaporator compartment, the present invention facilitates the installation of the expansion tube and the capillary tube, has better installation reliability, and can also save space in the evaporator compartment.

[0025] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0026] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0027] Figure 1 This is a schematic structural diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a throttling evaporation assembly according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic structural diagram of a throttling evaporation assembly according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic structural diagram of a throttling evaporation assembly according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention. Detailed Implementation

[0034] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Figure 1 This is a schematic structural diagram of a freezing and refrigeration apparatus according to an embodiment of the present invention, such as... Figure 1 As shown, and with reference Figure 2-7 This invention provides a refrigeration and freezing device, which includes a shell and a throttling evaporation assembly.

[0036] like Figure 1 As shown, a foamed layer 70 is formed inside the shell, and the foamed layer 70 at least surrounds the equipment cavity. Figure 2 As shown, the throttling evaporation assembly includes a capillary tube 301, an expansion tube 302, and an evaporator 40 connected in sequence. The cross-sectional area inside the expansion tube is larger than the cross-sectional area inside the capillary tube 301. The expansion tube is at least partially covered with low-frequency sound-absorbing material 304 and embedded in the foaming layer. The evaporator 40 is located inside the equipment cavity.

[0037] Specifically, the capillary tube 301 and the expander tube 302 are components of the throttling device. During refrigeration, the refrigerant flows sequentially through the capillary tube 301, the expander tube 302, and the evaporator 40. When the refrigerant flows through the capillary tube 301, the capillary tube 301 throttles the refrigerant; when the refrigerant flows through the expander tube 302, the expander tube 302 reduces the refrigerant pressure, thereby reducing refrigerant flow noise and ejection noise. However, when the refrigerant flows through the expander tube 302, the expander tube 302 vibrates. Since both the expander tube 302 and the foam layer are rigid materials, resonance between them is likely to occur. Furthermore, the foaming material of the foam layer only isolates high-frequency noise, but it amplifies low-frequency noise. To eliminate low-frequency noise and vibration, this invention wraps the expander tube with a low-frequency sound-absorbing material.

[0038] Therefore, in this embodiment, on the one hand, an expansion tube is provided between the evaporator and the capillary tube, and the cross-sectional area of ​​the expansion tube is larger than that of the capillary tube. This expansion tube can reduce pressure, thereby reducing or weakening the ejection energy and thus reducing ejection noise. On the other hand, the expansion tube is at least partially covered with low-frequency sound-absorbing material and embedded in the foaming layer. The low-frequency sound-absorbing material can isolate part of the expansion tube from the foaming layer. The low-frequency sound-absorbing material has the function of isolating low-frequency noise and reducing vibration, while the foaming material in the foaming layer has the function of eliminating high-frequency noise. Therefore, the refrigeration and freezing device of the present invention has the effect of noise reduction and vibration reduction. In addition, since the space of the foaming layer is larger, compared with the prior art where the throttling device is installed in the evaporator compartment, the present invention partially installs the throttling device in the foaming layer, which can save space in the evaporator compartment and facilitate the installation of the throttling device. In addition, compared with the prior art, the present invention can also improve the installation reliability of the throttling device.

[0039] like Figure 2 As shown, in some alternative embodiments of the present invention, an expansion tube 302 is connected in series between the capillary tube 301 and the evaporator 40.

[0040] like Figure 3 As shown, in some alternative embodiments of the present invention, there are at least two expansion tubes 302 connected in series in the capillary tube 301 to divide the capillary tube 301 into at least two segments; and the low-frequency noise-absorbing material 304 covers all the expansion tubes 302 and is continuously disposed at least between the mutually distant ends of the two expansion tubes 302 that are furthest apart.

[0041] Specifically, among the expansion tubes 302, the expansion tube closest to the evaporator 40 is the last expansion tube, and the remaining expansion tubes are intermediate expansion tubes.

[0042] In this embodiment, since at least two expansion tubes are connected in series on the capillary tube, these at least two expansion tubes can provide at least two stages of stepped pressure reduction, thereby reducing or weakening the ejection energy and further reducing the ejection noise of the refrigeration system. Specifically, after the refrigerant enters the intermediate expansion tube from the capillary tube, the intermediate expansion tube releases the refrigerant. During the pressure release process, the refrigerant will not eject, but will only vibrate slightly. Then, the refrigerant enters the final expansion tube from the capillary tube 301, which can further reduce the pressure of the refrigerant. When the refrigerant enters the evaporator 40 from the final expansion tube, the ejection of the refrigerant is significantly weakened, thereby reducing the ejection noise.

[0043] More preferably, at least two expansion tubes 302 and / or at least two capillary segments have different tube lengths and / or different internal cross-sectional areas.

[0044] Specifically, the length and cross-sectional area of ​​the expansion tube 302 are factors affecting the noise reduction, while the length and cross-sectional area of ​​the capillary section are factors affecting the throttling. In other words, the length and cross-sectional area of ​​each expansion tube 302 and capillary section can be selected according to the throttling and noise reduction requirements.

[0045] In this embodiment, through the above settings, the present invention can balance throttling and noise reduction, and can simultaneously achieve good throttling and noise reduction effects.

[0046] like Figure 4 As shown, in some optional embodiments of the present invention, a transition tube 303 is further connected in series between the expansion tube 302 and the evaporator 40. The cross-sectional area inside the transition tube 303 is larger than the cross-sectional area inside the capillary tube 301 and smaller than the cross-sectional area inside the refrigerant tube of the evaporator 40. Furthermore, a low-frequency sound-absorbing material 304 also covers the transition tube 303. In this embodiment, since the transition tube 303 is also covered with a low-frequency sound-absorbing material 304, the ejection noise can be further reduced.

[0047] More preferably, there are at least two expansion tubes 302 connected in series in the capillary tube 301 to divide the capillary tube 301 into at least two segments, and the transition tube 303 is connected in series between the expansion tube 302 and the evaporator 40 near the evaporator 40.

[0048] In some alternative embodiments of the present invention, the low-frequency sound-absorbing material 304 is formed into a flexible roll, which is wrapped around the expansion tube 302 to form a sleeve-shaped sound-absorbing package. For example, the low-frequency sound-absorbing material 304 is sound-absorbing cotton or sound-insulating felt.

[0049] like Figure 1 , Figure 2 and Figure 5 As shown, in some alternative embodiments of the present invention, the capillary tube 301 and the expansion tube 302 constitute a throttling device 30, and the position of the throttling device 30 connected to the evaporator 40 and / or the end away from the expansion tube 302 is exposed from the foaming layer 70.

[0050] like Figure 6 As shown, in some optional embodiments of the present invention, the throttling device 30 includes at least two throttling lines arranged in parallel and with controlled opening. Each throttling line is a first throttling device 31, and each first throttling device 31 consists of a capillary tube 301 and an expansion tube 302.

[0051] The refrigeration unit also includes a controller configured to control the opening degree of each throttling pipe according to the working fluid pressure and / or compressor speed in the refrigeration system.

[0052] In this embodiment, "working fluid" refers to refrigerant, and "working fluid pressure" refers to refrigerant pressure. The refrigeration system has a pressure measuring location, which can be any one of the following: the compressor's discharge pipe, the condenser's inlet pipe, the condenser's outlet pipe, the inlet of the throttling device, the outlet of the throttling device, the evaporator's inlet pipe, the evaporator's outlet pipe, or the compressor's return pipe. Obtaining the working fluid pressure in the refrigeration system means obtaining the refrigerant pressure at the pressure measuring location. "Controlling the opening degree of each throttling pipe" means controlling the refrigerant flow rate in each throttling pipe. When the opening degree of a throttling pipe is 0, the corresponding refrigerant flow rate in that throttling pipe is zero, equivalent to closing the throttling pipe. When the opening degree of a throttling pipe is greater than 0, the corresponding refrigerant flow rate in that throttling pipe is greater than zero, equivalent to opening the throttling pipe. The smaller the opening degree of the throttling pipe, the smaller the corresponding refrigerant flow rate in that throttling pipe; the larger the opening degree of the throttling pipe, the larger the corresponding refrigerant flow rate in that throttling pipe.

[0053] In a refrigeration system, the higher the working fluid pressure or compressor speed, the greater the refrigerant flow and ejection noise generated. In this case, opening multiple throttling lines can significantly reduce noise. That is, compared to a single throttling line, the throttling device in this embodiment includes at least two throttling lines arranged in parallel. On the one hand, under the same working fluid pressure conditions, the refrigeration system of this invention can still have lower noise; on the other hand, under the same output noise condition, this invention can increase the upper limit of the applicable working fluid pressure and the upper limit of the compressor speed used in the refrigeration system.

[0054] Furthermore, since the opening degree of the throttling pipe is controlled, the present invention controls the opening degree of each throttling pipe according to the working fluid pressure or compressor speed in the refrigeration system, which can balance the working fluid pressure and working fluid noise, as well as the compressor speed and working fluid pressure, thereby achieving the best noise reduction effect.

[0055] More preferably, the noise reduction structures of at least two of the throttling pipes have different noise reduction amounts. That is, the number and / or structure of the expansion tubes of at least two of the throttling pipes are different. Specifically, the structure of the expansion tube in each throttling pipe includes the tube length and the internal cross-sectional area.

[0056] In this embodiment, the controller is configured to: when the working fluid pressure and / or compressor speed in the refrigeration system are less than their respective first preset values, the throttling pipeline with the smallest noise reduction is selected as the controlled pipeline; when the working fluid pressure and / or compressor speed in the refrigeration system are not less than their respective first preset values, the throttling pipeline with the smallest noise reduction and another throttling pipeline determined according to the difference between the working fluid pressure and / or compressor speed and their respective preset values ​​are combined as the controlled pipeline combination.

[0057] For example, such as Figure 6As shown, there are three throttling lines, and the noise reduction of these three throttling lines is different. When the working fluid pressure and / or compressor speed in the refrigeration system are not less than their respective first preset values ​​and are less than their respective second preset values, the throttling line with the smallest noise reduction and another throttling line are opened; when the working fluid pressure and / or compressor speed in the refrigeration system are not less than their respective second preset values, all three throttling lines are opened.

[0058] like Figure 7 As shown, in some optional embodiments of the present invention, a capillary tube and an expansion tube are connected in series to form a first throttling device 31; and the throttling evaporation assembly further includes a second throttling device 32 connected in parallel with the first throttling device 31, wherein the second throttling device 32 has no expansion tube and is located inside or outside the foaming layer.

[0059] In other words, in this embodiment, the throttling device 30 includes two throttling pipes connected in parallel and whose opening is controlled. The two throttling pipes are the first throttling device 31 and the second throttling device 32, respectively.

[0060] During refrigeration, when the working fluid pressure and / or compressor speed in the refrigeration system are less than their respective first preset values, the second throttling device 32 is used as the controlled pipeline, and the first throttling device 31 is closed. When the working fluid pressure and / or compressor speed in the refrigeration system are not less than their respective first preset values, both the first throttling device 31 and the second throttling device 32 are used as controlled pipelines, or only the first throttling device 31 is used as a controlled branch.

[0061] More preferably, the throttling device 30 includes at least three throttling pipes arranged in parallel and with controlled opening, one of which is a second throttling device 32, and the other throttling pipes are all first throttling devices 31.

[0062] like Figure 6 and Figure 7 As shown, in some optional embodiments of the present invention, the refrigeration system further includes a pressure sensor 60, which is disposed on the discharge pipe of the compressor 10 and used to test the discharge pressure of the compressor 10; that is, the pressure sensor 60 is located between the discharge port of the compressor 10 and the inlet of the condenser 20. Obtaining the working fluid pressure includes: obtaining the discharge pressure of the compressor and using the discharge pressure as the working fluid pressure.

[0063] like Figure 6 and Figure 7 As shown, in some optional embodiments of the present invention, the throttling device 30 further includes a switching valve 33, the inlet of which is connected to the outlet of the condenser 20, and the outlet of which is connected to each of the throttling lines. The switching valve 33 is used to control the opening or closing of each of the throttling lines according to the working fluid pressure and / or compressor speed.

[0064] More preferably, the switching valve 33 is a proportional valve. The proportional valve can control the opening degree of each throttling pipeline according to the actual speed, thereby balancing the actual speed of the compressor and the noise of the working fluid, thus achieving the best noise reduction effect.

[0065] In some optional embodiments of the present invention, the refrigeration and freezing device is a refrigerator. In other optional embodiments of the present invention, the refrigeration and freezing device is a freezer.

[0066] The present invention also provides a method for manufacturing the refrigeration apparatus according to the above embodiments. The method for manufacturing the refrigeration apparatus includes the following steps:

[0067] Step S1: The low-frequency sound-absorbing material 304 is wrapped around the expansion tube 302 to form a noise reduction component. The expansion tube 302 is used to connect the capillary tube 301 and the evaporator 40. The cross-sectional area inside the expansion tube 302 is larger than the cross-sectional area inside the capillary tube 301.

[0068] Step S2: After the noise reduction component is installed in the foamed area inside the housing of the refrigeration and freezing device, foam material is filled into the foamed area and foaming is performed so that the noise reduction component is embedded in the foamed layer 70 of the foamed area.

[0069] In existing technologies, the throttling device is installed in the space of the evaporator compartment. Since the space in the evaporator compartment is relatively small, the installation of the throttling device is not very convenient. Because the space in the foaming layer is relatively large, in this invention, the throttling device is installed within the foaming layer, which facilitates its installation and saves space in the evaporator compartment. Therefore, the manufacturing method of this invention has the advantages of being simple and easy to operate. Furthermore, this invention can reduce the vibration of the expansion tube and isolate low-frequency and high-frequency noise.

[0070] In some optional embodiments of the present invention, the noise reduction component is installed in the foaming area within the housing of the refrigeration and freezing device, including: sequentially connecting the capillary tube 301, the noise reduction component, and the evaporator 40 to form a throttling evaporation component; and installing the throttling evaporation component within the housing.

[0071] In some optional embodiments of the present invention, the method of covering the expansion tube 302 with the low-frequency noise-absorbing material 304 to form a noise reduction component includes: winding the low-frequency noise-absorbing material 304 around the expansion tube 302 and fixing it by binding, wherein the low-frequency noise-absorbing material 304 is formed into a flexible roll and wrapped around the expansion tube to form a sleeve-shaped noise-absorbing package. In some alternative embodiments, the low-frequency noise-absorbing material 304 is wound around the expansion tube 302 by adhesive bonding.

[0072] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A freezing and refrigeration apparatus, characterized in that, include: A housing, wherein a foamed layer is formed inside the housing, and the foamed layer at least surrounds a device cavity; A throttling evaporation assembly includes a throttling device and an evaporator connected in sequence. The throttling device includes at least two throttling pipes arranged in parallel. At least one of the throttling pipes is a first throttling device. Each first throttling device includes a capillary tube and an expansion tube connected in sequence. The cross-sectional area inside the expansion tube is larger than the cross-sectional area inside the capillary tube. The expansion tube is covered with low-frequency sound-absorbing material and embedded in the foaming layer. The evaporator is disposed inside the equipment cavity. The expansion tubes are at least two in number and connected in series in the capillary to divide the capillary into at least two segments; and the low-frequency sound-absorbing material covers all the expansion tubes and is continuously arranged at least between the farthest ends of the two expansion tubes. The low-frequency sound-absorbing material is formed into a flexible roll, which is wrapped around the expansion tube to form a sleeve-shaped sound-absorbing package; the low-frequency sound-absorbing material is sound-absorbing cotton or sound-insulating felt; A controller configured to control the opening degree of each of the throttling lines based on the working fluid pressure and compressor speed in the refrigeration system; Wherein, at least two of the throttling pipes have different noise reduction structures; the controller is configured to: when the working fluid pressure and / or the compressor speed in the refrigeration system are less than their respective first preset values, the throttling pipe with the smallest noise reduction is selected as the controlled pipe; when the working fluid pressure and / or the compressor speed in the refrigeration system are not less than their respective first preset values, the throttling pipe with the smallest noise reduction and another throttling pipe determined according to the difference between the working fluid pressure and / or the compressor speed and their respective preset values ​​are combined as a controlled pipe combination.

2. The refrigeration and freezing apparatus according to claim 1, characterized in that, A transition pipe is also connected in series between the expansion tube and the evaporator. The cross-sectional area of ​​the transition pipe is larger than that of the capillary tube but smaller than that of the refrigerant tube of the evaporator. The low-frequency noise-absorbing material also covers the transition tube.

3. The refrigeration and freezing apparatus according to claim 1, characterized in that, The position of the first throttling device connected to the evaporator and / or the end away from the expansion tube is exposed from the foaming layer.

4. The refrigeration and freezing apparatus according to claim 3, characterized in that, At least two of the expansion tubes and / or at least two of the capillary segments have different lengths and / or different internal cross-sectional areas.

5. The refrigeration and freezing apparatus according to claim 1, characterized in that, At least one of the throttling pipes is a second throttling device, which does not have the expansion pipe and is located inside or outside the foaming layer.

6. A method for manufacturing a refrigeration and freezing apparatus as described in any one of claims 1 to 5, characterized in that, include: A noise reduction assembly is formed by covering the expansion tube with low-frequency sound-absorbing material, wherein the expansion tube is used to connect the capillary tube and the evaporator, and the cross-sectional area inside the expansion tube is larger than the cross-sectional area inside the capillary tube. After the noise reduction component is installed in the foamed area inside the housing of the refrigeration and freezing device, foaming material is filled into the foamed area and foaming is performed so that the noise reduction component is embedded in the foamed layer of the foamed area.

7. The manufacturing method according to claim 6, characterized in that, The noise reduction component is installed in the foamed area within the housing of the refrigeration and freezing unit, including: The capillary tube, the noise reduction component, and the evaporator are connected in sequence to form a throttling evaporation component; The throttling evaporation assembly is installed in place within the housing.

8. The manufacturing method according to claim 7, characterized in that, The noise reduction component formed by covering the expansion tube with low-frequency sound-absorbing material includes: The low-frequency noise-absorbing material is wound around the expansion tube and fixed by binding. The low-frequency noise-absorbing material is formed into a flexible roll and wrapped around the expansion tube to form a sleeve-shaped noise-absorbing package.

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