Silencing pipe and refrigeration equipment

Abstract

The utility model relates to a hush pipe and refrigeration equipment. According to one example of the present application, the silencing tube includes an inlet portion, an outlet portion, and a silencing portion. The inlet part is used for being connected with an inlet pipeline and comprises an inlet cavity. The outlet part is used for being connected with an outlet pipeline and comprises an outlet cavity. The silencing part is connected between the inlet part and the outlet part in the first direction and comprises a silencing cavity communicated with the inlet cavity and the outlet cavity. The flow area of the silencing cavity is larger than the flow area of the inlet cavity and the flow area of the outlet cavity. The flow area of the silencing cavity of the silencing pipe is increased, after fluid from the inlet cavity reaches the silencing cavity, the flow speed of the fluid in the large silencing cavity is reduced to be buffered, and then the fluid passes through the outlet cavity at the uniform flow speed, leaves the silencing pipe and enters the outlet pipeline. In this way, the impulse noise of the coolant in the refrigeration device can be improved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a silencer pipe and a refrigeration device. Background Art

[0002] As people's living standards improve, their requirements for noise control of refrigeration equipment are also gradually increasing. The main sources of noise in refrigeration equipment are compressor operation noise, refrigerant flow noise, fan noise, exhaust pulsation noise, etc. Exhaust pulsation noise is mainly caused by the pressure pulsation generated by the compressor periodically compressing the refrigerant. Exhaust pressure pulsation is the root cause of pipeline vibration and noise.

[0003] At present, in order to reduce the pipeline vibration caused by exhaust pressure pulsation, most manufacturers in the industry adopt the method of adding shock-absorbing blocks to the pipeline parts or optimizing the pipeline structure. However, the improvement effect is very small. It can only improve the vibration and noise corresponding to a certain fixed frequency, but cannot improve the pipeline vibration and noise caused by multiple frequency domains. Utility Model Content

[0004] The present application provides a silencer pipe and a refrigeration device to solve some or all of the deficiencies in the related art.

[0005] The first aspect of the present application provides a muffler pipe, comprising:

[0006] The inlet part is used to connect with the inlet pipe, and includes an inlet cavity.

[0007] The outlet part is used for connecting with the outlet pipe, and includes an outlet cavity.

[0008] The muffler part is connected between the inlet part and the outlet part along the first direction, and includes a muffler cavity connected with the inlet cavity and the outlet cavity, wherein the flow area of ​​the muffler cavity is larger than the flow area of ​​the inlet cavity and the flow area of ​​the outlet cavity.

[0009] Furthermore, the muffler portion includes a main body unit and a transition unit. The muffler cavity includes a main body cavity arranged in the main body unit and a transition cavity arranged in the transition unit.

[0010] The transition unit is connected between the main unit and the inlet portion. In the direction from the inlet portion to the main unit, the flow area of ​​the transition cavity gradually increases. And / or,

[0011] The transition unit is connected between the main unit and the outlet portion. In the direction from the outlet portion to the main unit, the flow area of ​​the transition chamber gradually increases.

[0012] Furthermore, the inner diameter of the silencing cavity is greater than or equal to 5 mm and less than or equal to 30 mm.

[0013] Further, in the first direction, the size L of the silencer portion satisfies:

[0014]

[0015] Wherein, n is a natural number, f is the target muffler frequency, and c is the sound velocity of the fluid flowing in the muffler pipe.

[0016] Furthermore, the diameters of the inlet cavity and the outlet cavity are the first diameter, and the diameter of the muffler cavity is the second diameter. The relationship between the first diameter d1 and the second diameter d2 satisfies:

[0017]

[0018] Wherein, TL is the maximum sound-absorbing decibel of the silencer pipe, f is the target sound-absorbing frequency, L is the size of the silencer pipe in the first direction, and c is the sound velocity of the fluid flowing in the silencer pipe.

[0019] Furthermore, the inlet portion, the outlet portion and the silencer portion are integrally formed.

[0020] The second aspect of the present application provides a refrigeration device, comprising a compressor, a condenser, an inlet pipe, an outlet pipe and the muffler pipe described in the above embodiment. The inlet pipe is connected to the compressor and the inlet part. The outlet pipe is connected to the condenser and the outlet part.

[0021] Further, the inlet pipe is fixedly connected to the inner wall of the inlet cavity. And / or, the outlet pipe is fixedly connected to the inner wall of the outlet cavity.

[0022] Furthermore, the refrigeration device further comprises: an evaporator and a capillary tube. One end of the capillary tube is connected to the condenser, and the other end is connected to the evaporator. One end of the evaporator away from the capillary tube is connected to the compressor.

[0023] Furthermore, the refrigeration device further comprises a drying filter, one end of which is connected to the condenser, and the other end of which is connected to the capillary tube.

[0024] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0025] It can be seen from the above embodiments that the flow area of ​​the silencer cavity of the silencer pipe of the present application is increased. After the fluid from the inlet cavity reaches the silencer cavity, the flow velocity of the fluid is reduced and buffered in the larger silencer cavity, and then leaves the silencer pipe through the outlet cavity at a relatively uniform flow rate and enters the outlet pipe. In this way, the pulse noise of the coolant in the refrigeration equipment can be improved. The flow area of ​​the outlet cavity is smaller than the flow area of ​​the silencer cavity, which can increase the flow velocity of the fluid after noise reduction, thereby ensuring the heat exchange efficiency of the refrigeration equipment.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A simplified schematic diagram of a refrigeration circuit of a refrigeration device of the present application is shown;

[0029] Figure 2 Shown is an overall schematic diagram of an embodiment of a refrigeration device of the present application;

[0030] Figure 3 Shown is an overall schematic diagram of an embodiment of a muffler pipe of the present application;

[0031] Figure 4 Shown as Figure 3 A schematic cross-sectional view of the muffler pipe of the illustrated embodiment;

[0032] Figure 5 Shown as Figure 3 A cross-sectional schematic diagram of the silencer pipe of the illustrated embodiment connected to a refrigeration circuit;

[0033] Figure 6 A cross-sectional schematic diagram showing another embodiment of the muffler pipe of the present application connected to a refrigeration circuit;

[0034] Figure 7 The figure shows the relationship between the target sound elimination frequency and the maximum sound elimination decibel under different embodiments;

[0035] Figure 8 The figure shows the relationship between the target silencing frequency and the maximum decibel under different schemes;

[0036] Fig. 9The figure shows a comparison of the noise decibels of a noise reduction wine cabinet equipped with the silencer pipe of the present application and a conventional wine cabinet at different sound frequencies.

[0037] Description of reference numerals:

[0038] 100 refrigeration equipment, 1 silencer, 11 inlet part, 111 inlet cavity, 12 outlet part, 121 outlet cavity, 13 silencer part, 131 silencer cavity, 1311 main cavity, 1312 transition cavity, 132 main unit, 133 transition unit, 2 inlet pipe, 3 outlet pipe, 4 compressor, 5 condenser, 6 evaporator, 7 capillary tube, 8 drying filter, X first direction, d1 first diameter, d2 second diameter, L length, α angle. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The methods described in the following exemplary embodiments do not represent all methods consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0040] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one, and if only "one" is referred to, it will be separately described. "Multiple" or "several" means two or more. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0041] refer to Figure 1 and Figure 2 The present application provides a refrigeration device 100. The refrigeration device 100 may be as follows: Figure 2 The wine cooler shown may also be a refrigerator, freezer or other equipment. The refrigeration equipment 100 includes a muffler 1, an inlet pipe 2, an outlet pipe 3, a compressor 4 and a condenser 5. The muffler 1 is connected to the compressor 4 through the inlet pipe 2 and to the condenser 5 through the outlet pipe 3. The high-pressure and high-temperature fluid generated by the compressor 4 can enter the muffler 1 through the inlet pipe 2 and then enter the condenser 5 through the outlet pipe 3. The compressor 4 generates pressure pulsations during operation. The fluid pressure from the compressor 4 is not uniform, causing the refrigeration equipment 100 to generate noise.

[0042] Therefore, the refrigeration device 100 of the present application is provided with a silencer pipe 1 to reduce the noise of the refrigeration device 100. The following will describe the silencer pipe 1. It should be understood that the various embodiments described in the present application can be implemented in combination without conflict.

[0043] refer to Figures 2 to 4 , the silencer pipe 1 of the present application includes an inlet portion 11, an outlet portion 12 and a silencer portion 13. The inlet pipe 2 is connected to the inlet portion 11. The outlet pipe 3 is connected to the outlet portion 12. The silencer portion 13 is connected between the inlet portion 11 and the outlet portion 12 along a first direction X. The inlet portion 11 includes an inlet cavity 111. The outlet portion 12 includes an outlet cavity 121. The silencer portion 13 includes a silencer cavity 131 connected to the inlet cavity 111 and the outlet cavity 121, so that the fluid from the compressor 4 can flow through the silencer pipe 1 and enter the outlet pipe through the inlet cavity 111, the silencer cavity 131 and the outlet cavity 121 at one time. Among them, the flow area of ​​the silencer cavity 131 is larger than the flow area of ​​the inlet cavity 111 and larger than the flow area of ​​the outlet cavity 121.

[0044] The flow area of ​​the silencer chamber 131 is increased, and after the fluid from the inlet chamber 111 reaches the silencer chamber 131, the flow velocity of the fluid is reduced in the larger silencer chamber 131 and buffered, and then the fluid leaves the silencer pipe 1 through the outlet chamber 121 at a relatively uniform flow velocity and enters the outlet pipe 3. In this way, the pulse noise of the coolant in the refrigeration device 100 can be improved. The flow area of ​​the outlet chamber 121 is smaller than the flow area of ​​the silencer chamber 131, which can increase the flow velocity of the fluid after noise reduction, thereby ensuring the heat exchange efficiency of the refrigeration device 100.

[0045] In addition, the silencer pipe 1 of the present application is arranged between the compressor 4 and the condenser 5 because the pressure pulse amplitude of the fluid leaving the compressor 4 is the largest and the noise is also the largest. Therefore, after the fluid of the refrigeration device 100 of the present application leaves the compressor 4, it directly enters the silencer pipe 1 for silencing, which can reduce the fluid noise caused by the pressure pulse of the compressor 4 to the greatest extent.

[0046] It should be noted that the connection between the inlet pipe 2 and the inlet portion 11 should be understood as a direct connection or an indirect connection. For example, on a cross section perpendicular to the first direction X, if there are both a cross section of the inlet pipe 2 and a cross section of the inlet portion 11, the portion of the muffler 1 corresponding to the cross section position should be understood as the inlet portion 11. Similarly, the connection between the outlet pipe 3 and the outlet portion 12 should also be understood in this way.

[0047] In other words, the inlet pipe 2 and the outlet pipe 3 of the refrigeration device 100 of the present application do not extend into the silencer chamber 131, thereby maximizing the silencer space of the silencer chamber 131 and improving the noise reduction effect.

[0048] Optionally, the refrigeration device 100 further includes an evaporator 6 and a capillary tube 7. One end of the capillary tube 7 is connected to the condenser 5, and the other end is connected to the evaporator 6. The end of the evaporator 6 away from the capillary tube 7 is connected to the compressor 4. The role of the compressor 4 in the refrigeration device 100 is mainly to absorb the low-temperature and low-pressure refrigerant vapor from the evaporator 6, and finally become high-temperature and high-pressure vapor after adiabatic compression by the compressor 4. The role of the condenser 5 in the refrigeration device 100 is to introduce the high-temperature and high-pressure vapor in the compressor 4 into the condenser 5, condense the refrigerant vapor under the same pressure, and dissipate heat to the surrounding medium to turn it into a high-pressure and low-temperature refrigerant cold liquid. The role of the capillary tube 7 in the refrigeration device 100 is mainly to convert the high-pressure and low-temperature refrigerant cold liquid into a low-temperature and low-pressure refrigerant vapor after isenthalpy throttling in the capillary tube 7, and then send the refrigerant vapor into the evaporator 6. The evaporator 6 in the refrigeration equipment 100 mainly boils the low-temperature and low-pressure refrigerant vapor passing through the capillary tube 7 under the condition of isobaric pressure in the evaporator 6. The refrigerant vapor absorbs heat from the surrounding medium during the boiling process and eventually becomes low-temperature and low-pressure refrigerant dry saturated vapor.

[0049] In an optional embodiment, the refrigeration device 100 further includes a filter dryer 8. One end of the filter dryer 8 is connected to the condenser 5, and the other end is connected to the capillary tube 7. The filter dryer 8 can filter impurities to prevent the fluid in the refrigeration circuit from being blocked, thereby causing ice blockage in the refrigeration device 100. At the same time, it is arranged at one end before the coolant enters the capillary tube 7, which can prevent impurities from entering the capillary tube 7 and causing blockage and damage to the capillary tube 7, thereby increasing the service life of the capillary tube 7.

[0050] The connection between the inlet pipe 2 and the inlet part 11, and the connection between the outlet pipe 3 and the outlet part 12 can be achieved by welding, bonding, screwing, etc. In addition, there are also many ways to connect the positions. Figure 4 As shown, the inlet pipe 2 is fixedly connected to the inner wall of the inlet cavity 111, and the outlet pipe 3 is fixedly connected to the inner wall of the outlet cavity 121. This arrangement is convenient for assembly workers. For example, when the inlet pipe 2 and the inlet part 11 are welded, since the inlet pipe 2 is arranged on the inner wall of the inlet cavity 111, the welding position is actually at the end of the inlet part 11 away from the muffler part 13, so the welding space is larger and the operation is more convenient. Or, as Figure 5 As shown, the inlet pipe 2 is connected to the outer wall of the inlet part 11, and the outlet pipe 3 is connected to the outer wall of the outlet part 12. The present application is not limited thereto.

[0051] The connection method between the inlet pipe 2 and the inlet part 11, and the connection method between the outlet pipe 3 and the outlet part 12 can be the same, so as to facilitate assembly; or, the connection method between the inlet pipe 2 and the inlet part 11, and the connection method between the outlet pipe 3 and the outlet part 12 can be different, so as to meet the assembly requirements inside the refrigeration equipment 100.

[0052] The size of the inlet portion 11 (e.g., the outer circumference size, the inner wall size of the inlet cavity 111) and the size of the outlet portion 12 can be the same, so that it is convenient to use the same outlet pipe 3 and inlet pipe 2 for connection, and there is no need to distinguish the inlet end and the outlet end during assembly, which is convenient for assembly. However, the size of the inlet portion 11 and the size of the outlet portion 12 can also be set to be different according to the adjustment of the required fluid flow rate, and the present application does not limit this.

[0053] In various embodiments, the inlet portion 11, the outlet portion 12 and the muffler portion 13 may be integrally formed. The integrally formed muffler portion 13 can improve the sealing performance of the muffler pipe 1, and prevent the fluid from leaking from the connection position between the inlet portion 11 and the muffler portion 13, or the connection position between the outlet portion 12 and the muffler portion 13. In addition, the muffler pipe 1 may be made of metal, such as steel, copper, etc.

[0054] like Figure 6 As shown, the flow area between the inlet cavity 111 and the muffler cavity 131 may be changed in a step-like manner. That is, the flow area of ​​the muffler cavity 131 is uniform, and the flow area of ​​the inlet cavity 111 is also uniform and smaller than the muffler cavity 131, so a step-like change in the flow area occurs at the connection position of the muffler cavity 131 and the inlet cavity 111. Similarly, the flow area between the outlet cavity 121 and the muffler cavity 131 may also be changed in a step-like manner.

[0055] like Figure 3As shown, in an optional embodiment, the muffler portion 13 includes a main unit 132 and a transition unit 133. The muffler cavity 131 includes a main cavity 1311 disposed in the main unit 132 and a transition cavity 1312 disposed in the transition unit 133. The transition unit 133 is connected between the main unit 132 and the inlet portion 11. In addition, in the direction from the inlet portion 11 to the main unit 132, the flow area of ​​the transition cavity 1312 gradually increases. Figure 3 This arrangement gradually increases the flow area between the inlet cavity 111 and the silencer cavity 131 at the connection position, so that the sound waves of the fluid can be stably introduced into the silencer cavity 131, and the sound waves are reflected and diffracted, thereby achieving a better noise reduction effect.

[0056] In another embodiment, the transition unit 133 is connected between the main unit 132 and the outlet portion 12, and the flow area of ​​the transition chamber 1312 gradually increases in the direction from the outlet portion 12 to the muffler portion 13. The transition unit 133 can guide the fluid to flow from the muffler chamber 131 to the outlet chamber 121, and gradually increase the flow rate to prevent the sudden change in flow rate from causing a sudden change in pressure on the inner wall of the muffler chamber 131, thereby generating undesirable stress.

[0057] Indeed, the silencer 1 can be provided with a transition unit 133 between the main unit 132 and the inlet portion 11, and between the main unit 132 and the outlet portion 12. This arrangement is not only conducive to noise reduction and stress avoidance, but also does not need to distinguish between the inlet end and the outlet end of the silencer 1 during assembly, which facilitates assembly.

[0058] refer to Figure 4 In one embodiment, the transition unit 133 is configured to be conical. The angle α between the transition unit 133 and the first direction X is greater than or equal to 30° and less than or equal to 60°. When the size of the main unit 132 is fixed, the smaller the angle α, the larger the size of the transition unit 133 in the first direction X, which is not conducive to optimizing the size of the muffler 1; the larger the angle α, the lower the effect of the transition unit 133 on the introduction of sound waves. After many experiments, the inventors of the present application found that the angle α range has a good balance effect on noise reduction and size optimization.

[0059] In addition, the transition unit 133 can also be configured to be in an arc shape, which also has a better effect on the introduction of sound waves.

[0060] In addition, in the cross section perpendicular to the first direction X, the cross-sectional shapes of the muffler cavity 131 , the inlet cavity and the outlet cavity 121 may be circular, square, polygonal, etc., which is not limited in the present application.

[0061] The inventors found during the design and test process that the size of the muffler portion 13 in the first direction X is related to the target muffler frequency and the fluid sound velocity. Figure 4 In some embodiments, in the first direction X, the size L of the muffler portion 13 satisfies:

[0062]

[0063] Here, n is a natural number, f is a target sound elimination frequency, and c is a sound velocity of the fluid flowing in the silencer pipe 1 .

[0064] The size of the silencer portion 13 in the first direction X is limited by the target silencer frequency and the fluid sound velocity, which can ensure that the silencer portion 13 can achieve effective noise reduction and optimize the size of the silencer pipe 1 to avoid excessive occupation of the space inside the refrigeration device 100.

[0065] In addition, reference Figure 3 The inventors also found that the maximum volume of the muffler 1 is related to the diameter of the muffler cavity 131. When the diameters of the inlet cavity 111 and the inlet cavity are the same as the first diameter d1, the diameter of the muffler cavity 131 is defined as the second diameter d2. The relationship between the first diameter d1 and the second diameter d2 satisfies:

[0066]

[0067] Wherein, TL is the maximum sound-absorbing decibel of the silencer pipe 1 , f is the target sound-absorbing frequency, L is the dimension of the silencer pipe 1 in the first direction X, and c is the sound velocity of the fluid flowing in the silencer pipe 1 .

[0068] When designing the silencer pipe 1, the designer may, for example, first predetermine the desired length L of the silencer portion 13, the expansion ratio (i.e., the ratio of the second diameter d2 to the first diameter d1), and other parameters, and then verify whether the maximum silencing decibel meets the silencing requirements. Alternatively, for example, the maximum silencing decibel, the length of the silencer portion 13, etc. are first predetermined, and then the expansion ratio is obtained, and the first diameter d1 and the second diameter d2 are set according to actual requirements.

[0069] Table 1 is a parameter table of embodiments with different lengths L of the silencing portion 13. And taking multiple parameter values ​​within the maximum target silencing frequency f, the curve variation diagram of the maximum silencing decibel is calculated as shown in FIG. Figure 7 shown.

[0070] Table 1 Design parameters of silencer pipe 1

[0071]

[0072] It can be seen that when the target sound-absorbing frequency f is less than about 950 Hz or greater than about 1900 Hz, the decibel value of the sound-absorbing decibel of Example 1 is greater than that of Example 2. Then, when the sound frequency of the refrigeration equipment 100 is within this range, the parameter value of Example 1 is selected to design the silencer 1 to obtain a better sound-absorbing effect. When the target sound-absorbing frequency f is greater than 950 Hz and less than 1900 Hz, the decibel value of the sound-absorbing decibel of Example 2 is greater than that of Example 1. Then, when the sound frequency of the refrigeration equipment 100 is within this range, the noise reduction effect of the silencer 1 designed by selecting the parameter value of Example 2 is better.

[0073] See also Figure 8 , when the size L of the predetermined silencer portion 13 is 65 mm and the first diameter d1 remains unchanged, the second diameter d2 is designed to be 10 mm as Scheme 1, and the second diameter d2 is designed to be 15 mm as Scheme 2 for comparison. When the length L of the silencer portion 13 is constant, the width of the second diameter d2 increases, and the value of the maximum silencing decibel also increases, and it can be seen that the noise reduction effect is also better. When the internal space of the refrigeration equipment 100 allows, the noise reduction effect can be improved by increasing the inner diameter of the silencer cavity 131. Considering that the refrigeration equipment 100 is usually limited in size, in some embodiments, the inner diameter d2 of the silencer cavity 131 is greater than or equal to 5 mm and less than or equal to 30 mm. The inner diameter of the silencer cavity 131 in this range can better balance the noise elimination effect and the occupation of the internal space of the refrigeration equipment 100 by the silencer pipe 1.

[0074] The inventors also conducted experiments on an embodiment in which the refrigeration device 100 is a refrigerated wine cabinet, and designed a refrigerated wine cabinet without the muffler pipe 1 of the present application as a conventional wine cabinet, and a refrigerated wine cabinet with the muffler pipe 1 of the present application as a noise reduction wine cabinet. The conventional wine cabinet serves as a control group to compare whether the noise reduction wine cabinet in the experimental group has a good noise reduction effect. Fig. 9 As shown in the table, it can be clearly seen that the noise of the wine cabinet equipped with noise reduction at different sound frequencies is lower than that of the conventional wine cabinet. It can be seen that the silencer pipe 1 of the present application can achieve a good noise reduction effect.

[0075] The specific embodiments described herein are merely examples of the spirit of the present application. A person skilled in the art of the present application may make various modifications, supplements, or replace the described specific embodiments with similar methods, but they will not deviate from the spirit of the present application or exceed the scope defined by the attached claims.

[0076] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A muffler pipe, characterized in that: include: An inlet portion, used for connection with an inlet pipe, including an inlet cavity; an outlet portion, used to be connected to an outlet pipe, including an outlet cavity; and ； The muffler portion is connected between the inlet portion and the outlet portion along a first direction, and includes a muffler cavity connected to the inlet cavity and the outlet cavity; wherein the flow area of ​​the muffler cavity is larger than the flow area of ​​the inlet cavity and the flow area of ​​the outlet cavity.

2. The muffler pipe according to claim 1, characterized in that: The muffler part includes a main body unit and a transition unit; the muffler cavity includes a main body cavity arranged in the main body unit and a transition cavity arranged in the transition unit; wherein, The transition unit is connected between the main unit and the inlet portion; in the direction from the inlet portion to the main unit, the flow area of ​​the transition cavity gradually increases; and / or, The transition unit is connected between the main unit and the outlet portion; in the direction from the outlet portion to the main unit, the flow area of ​​the transition chamber gradually increases.

3. The muffler pipe according to claim 1, characterized in that: The inner diameter of the silencing cavity is greater than or equal to 5 mm and less than or equal to 30 mm.

4. The muffler pipe according to claim 1, characterized in that: In the first direction, the size L of the silencer portion satisfies: Wherein, n is a natural number, f is the target muffler frequency, and c is the sound velocity of the fluid flowing in the muffler pipe.

5. The muffler pipe according to claim 1, characterized in that: The diameters of the inlet cavity and the outlet cavity are the first diameter, and the diameter of the muffler cavity is the second diameter; wherein the relationship between the first diameter d1 and the second diameter d2 satisfies: Wherein, TL is the maximum sound-absorbing decibel of the silencer pipe, f is the target sound-absorbing frequency, L is the size of the silencer pipe in the first direction, and c is the sound velocity of the fluid flowing in the silencer pipe.

6. The muffler pipe according to any one of claims 1 to 5, characterized in that: The inlet portion, the outlet portion and the muffler portion are integrally formed.

7. A refrigeration device, characterized in that: It comprises a compressor, a condenser, an inlet pipe, an outlet pipe and a silencer as described in any one of claims 1 to 6; the inlet pipe is connected to the compressor and the inlet part; the outlet pipe is connected to the condenser and the outlet part.

8. The refrigeration device according to claim 7, characterized in that: The inlet pipe is fixedly connected to the inner wall of the inlet cavity; and / or, The outlet pipe is fixedly connected to the inner wall of the outlet cavity.

9. The refrigeration device according to claim 7, characterized in that: The refrigeration equipment also includes: An evaporator and a capillary tube; one end of the capillary tube is connected to the condenser, and the other end is connected to the evaporator; and one end of the evaporator away from the capillary tube is connected to the compressor.

10. The refrigeration device according to claim 9, characterized in that: The refrigeration equipment also includes a drying filter; One end of the drying filter is connected to the condenser, and the other end is connected to the capillary tube.

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