Pipeline noise reduction device and air conditioner

Abstract

The invention provides a pipeline noise reduction device and an air conditioner, the pipeline noise reduction device comprises a main body, the main body is provided with a cavity, one end of the main body is provided with a first pipe body, the other end of the main body is provided with a second pipe body, the first pipe body and the second pipe body are communicated with the cavity, the inner side wall of the main body is provided with an arc-shaped surface, and the inner side wall of the main body is provided with an arc-shaped groove; a damping piece is arranged on the main body, and the damping piece is arranged opposite to the center of the arc-shaped surface. According to the air conditioner, the technical problems that in the prior art, a pipeline noise reduction structure can affect the area of an airflow circulation channel, consequently, airflow circulation is poor, and the efficiency of the air conditioner is affected can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioners, and in particular relates to a pipeline noise reduction device and an air conditioner. Background Art

[0002] The four main components of the air-conditioning system are the compressor, condenser, evaporator and expansion valve. All four are connected by pipes, and the refrigerant circulates in the pipes in different physical states. Pipeline vibration is mainly caused by the vibration of the compressor. During the operation of the compressor, it is affected by excitation sources such as electromagnetic force, gas force, unbalanced inertia force, friction force and impact force, which causes the vibration of the compressor. The vibration is transmitted to the pipe through the connection between the compressor and the pipe. In addition, there are generally fluid pressure wave pulsations and pipe wall structure vibrations in the air-conditioning system pipelines, and the two are coupled and affect each other. For example, when the fluid flow rate is greater than a certain critical value, the pipeline will become unstable and produce large-amplitude vibrations. Therefore, the liquid-filled pipeline is more prone to vibration than general mechanical structures.

[0003] The above air-conditioning system pipeline vibration will further lead to noise radiation and pipeline service life problems, affecting the market competitiveness of air-conditioning products. Traditional vibration and noise reduction measures for pipeline systems mainly include: using discontinuous access to flexible pipes on the pipe wall, coating with high damping materials, and installing rubber shock absorbers, dynamic vibration absorbers, and vibration-damping masses; adjusting the pipeline direction, support position, support structure, and pipeline structure size, etc. However, due to the large number of components in the pipeline system and the limitations of space, weight and other conditions, traditional measures have certain limitations. The acoustic black hole (ABH-Acoustic Black Hole) structure is expected to provide new methods and means to solve the above pipeline problems. The acoustic black hole is the acoustic analogy of the concept of a black hole in astrophysics. It is a structure that has a convergence effect on bending waves formed by changes in geometric parameters.

[0004] Related art discloses an acoustic black hole silencer, including a first cylinder with ports at both ends, a second cylinder arranged in the first cylinder, and fins arranged in the second cylinder, the number of fins is multiple and evenly arranged along the axial direction of the second cylinder, a through hole is arranged at the center of the fin, the radius of the through hole along the axial direction of the second cylinder gradually changes in a power function relationship, and an airflow channel is formed between the outer wall of the second cylinder and the inner wall of the first cylinder. The black hole acoustic structure composed of the second cylinder and the fins is used to play a role in silencer, and the airflow channel is used to pass airflow. However, its structure is complex and difficult to use in actual engineering applications, and the airflow channel area is small, which affects the airflow.

[0005] Since the pipeline noise reduction structure in the prior art will affect the air flow channel area, resulting in poor air flow and affecting the efficiency of the air conditioner and other technical problems, the present invention studies and designs a pipeline noise reduction device and an air conditioner. Summary of the invention

[0006] Therefore, the present invention provides a pipeline noise reduction device and an air conditioner, which can solve the technical problem in the prior art that the pipeline noise reduction structure affects the air flow channel area, resulting in poor air flow and affecting the efficiency of the air conditioner.

[0007] In order to solve the above problems, the present invention provides a pipeline noise reduction device, including: a main body, the main body having a cavity therein, a first tube body being arranged at one end of the main body, and a second tube body being arranged at the other end of the main body, the first tube body and the second tube body being connected to the cavity, the inner side wall of the main body having an arc-shaped surface, a damping member being arranged on the main body, and the damping member being arranged opposite to the center of the arc-shaped surface.

[0008] In some embodiments, the center point of the cavity is located on the central axis of the first tube body, and / or the center point of the cavity is located on the central axis of the second tube body.

[0009] In some embodiments, inner side walls of at least two of the main bodies have an arcuate surface, and a radial direction of the arcuate surface is the same as a radial direction of the first tube body.

[0010] In some embodiments, along the axial direction of the first tube body, a center line of the arcuate surface coincides with a center line of an inner side wall of the main body.

[0011] In some embodiments, the outer side wall of the main body is provided with a groove, and the groove penetrates the main body along the axial direction of the first tube body, and the damping member is disposed in the groove.

[0012] In some embodiments, the main body is a cubic structure, the side length of the main body is 3.75 times the radius of the first tube body, and the width of the groove is not less than 20% of the side length of the main body.

[0013] In some embodiments, the first tube and the second tube at least partially extend into the cavity.

[0014] In some embodiments, a length of a portion of the first tube extending into the cavity and a length of a portion of the second tube extending into the cavity are less than half of a height of the main body.

[0015] In some embodiments, the damping member is disposed on an outer side wall of the main body, and a length of the damping member is the same as a height of the main body.

[0016] The present invention also provides an air conditioner, which includes the aforementioned pipeline noise reduction device.

[0017] The pipeline noise reduction device and air conditioner provided by the present invention have the following beneficial effects:

[0018] The arc surface is used to collect the noise generated in the main body to the center of the arc surface, and then the damping parts are used to reduce noise and vibration. The arc surface and the damping parts form an acoustic black hole structure, which solves the noise and vibration problems of the air conditioning system pipeline without changing the inner diameter of the main pipeline or reducing the refrigerant flow rate in the main pipeline. On the one hand, the expansion cavity structure can achieve effective noise reduction in the 0-3200Hz frequency band and achieve the maximum sound attenuation near 1600Hz; on the other hand, the combined effect of the acoustic black hole structure and the damping material can greatly reduce the vibration of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 The structure diagram of the pipeline noise reduction device of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure diagram of the pipeline noise reduction device of the present invention is shown in FIG. Figure 2 ;

[0022] Figure 3 The structure diagram of the pipeline noise reduction device of the present invention is shown in FIG. Figure 3 ;

[0023] Figure 4 It is a schematic diagram of a power function cross section of a curved surface in the pipeline noise reduction device of the present invention;

[0024] Figure 5 Schematic diagram of elastic wave propagation of the pipeline noise reduction device of the present invention;

[0025] Figure 6 It is a waveform diagram showing the variation of the noise transmission loss of the length of the first tube body and the second tube body extending into the main body in the pipeline noise reduction device of the present invention with the frequency.

[0026] The accompanying drawings are marked as follows:

[0027] 1. Main body; 2. First tube body; 3. Second tube body; 4. Groove; 5. Arc surface. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] See also Figure 1-6As shown, according to an embodiment of the present invention, there is provided a pipeline noise reduction device, comprising: a main body 1, wherein the main body 1 has a cavity therein, a first tube body 2 is provided at one end of the main body 1, and a second tube body 3 is provided at the other end of the main body 1, the first tube body 2 and the second tube body 3 are connected to the cavity, the inner side wall of the main body 1 has an arc-shaped surface 5, and a damping member is provided on the main body 1, and the damping member is arranged opposite to the center of the arc-shaped surface 5. In this technical solution, the first tube body 2 and the second tube body 3 serve as the connecting neck tubes of the main pipe of the air conditioner. The first tube body 2 and the second tube body 3 are conveniently connected to the main pipe of the air conditioner. The inner wall of the main body 1 has an arc surface 5. The main body 1 is provided with a damping member. The damping member is arranged relative to the center of the arc surface 5. The arc surface 5 is used to collect the noise generated in the main body 1 to the center of the arc surface 5, and then the damping member is used to reduce noise and vibration. The arc surface 5 and the damping member form an acoustic black hole structure. Without changing the inner diameter of the main pipe and reducing the refrigerant flow rate in the main pipe, the noise and vibration problems of the air conditioning system pipeline are solved at the same time. On the one hand, the expansion cavity structure can achieve effective noise reduction in the 0-3200Hz frequency band and achieve the maximum sound reduction near 1600Hz; on the other hand, the combined effect of the acoustic black hole structure and the damping material can greatly reduce the vibration of the pipeline system.

[0033] In some embodiments, the center point of the cavity is located on the center axis of the first tube body 2, and / or, the center point of the cavity is located on the center axis of the second tube body 3. In this technical solution, the center point of the cavity is located on the center axis of the first tube body 2, and / or, the center point of the cavity is located on the center axis of the second tube body 3, that is, the airflow flows through the center of the main body 1, so that the arc surface 5 in the main body 1 can evenly collect the pipeline vibration energy, so as to achieve the effect of vibration reduction and noise reduction by using the damping member.

[0034] In some embodiments, at least two inner side walls of the main body 1 have an arcuate surface 5, and the radial direction of the arcuate surface 5 is the same as the radial direction of the first tube body 2. In this technical solution, at least two inner side walls of the main body 1 have an arcuate surface 5, and the radial direction of the arcuate surface 5 is the same as the radial direction of the first tube body 2. That is, the first tube body 2 and the second tube body 3 are located at both ends of the main body 1, and the main body 1 has N inner side walls. The inner side walls of the main body 1 can be designed as arcuate surfaces 5 in their entirety or partially. The radial direction of the arcuate surface 5 is the same as the radial direction of the first tube body 2, that is, the inner side wall of the main body 1 is an arcuate surface formed by being recessed outward.

[0035] In some embodiments, along the axial direction of the first tube body 2, the center line of the arc surface 5 coincides with the center line of the inner wall of the main body 1. In this technical solution, along the axial direction of the first tube body 2, the center line of the arc surface 5 coincides with the center line of the inner wall of the main body 1. In other words, the height of the side wall of the main body 1 is the distance between the two ends of the main body 1, the center line of the width of the side wall of the main body 1 is the center line of the inner wall of the main body 1, and the center of the arc surface 5 is located on the center line of the inner wall of the main body 1, so that the arc surface 5 can collect the vibration energy of the pipeline, thereby using the damping member to achieve the effect of vibration reduction and noise reduction.

[0036] In some embodiments, the outer wall of the main body 1 is provided with a groove 4, and the groove 4 penetrates the main body 1 along the axial direction of the first tube 2, and the damping member is arranged in the groove 4. In this technical solution, the groove 4 is a sink, and the damping member can be made of rubber: natural rubber or synthetic rubber, such as butyl rubber, chloroprene rubber, etc.; viscoelastic material: such as damping paste, damping pad, etc.; composite material: composed of a variety of materials, such as rubber and metal composite material, which can provide better damping effect, or the damping member uses other damping materials, and by setting the groove 4, the thickness of the side wall of the main body 1 at the groove 4 is minimized, so that it is convenient for the damping material to absorb the collected energy and reduce vibration and noise.

[0037] The pipeline noise reduction device of the present invention utilizes an acoustic black hole structure to gather the pipeline vibration energy at the groove position on the surface of the vibration reduction and noise reduction device. At this time, the vibration at this location is prominent, and then the damping material is attached to the preset groove, and the energy absorption characteristics of the damping material are utilized to absorb the vibration energy, thereby greatly reducing the vibration of the pipeline system. Usually, attaching the damping material to the location with greater vibration will produce a more significant vibration reduction effect.

[0038] In some embodiments, the main body 1 is in a cubic structure, the side length of the main body 1 is 3.75 times the radius of the first tube body 2, and the width of the groove 4 is not less than 20% of the side length of the main body 1. In this technical solution, the main body 1 is in a cubic structure, and the main body 1 is a cubic expansion sound cavity coaxially connected to the main pipeline. The side length of the cubic expansion sound cavity is greater than the diameter of the main pipeline. Preferably, the side length of the main body 1 is 3.75 times the radius of the main pipeline. The two ends of the cubic expansion sound cavity contain neck tubes equal to the diameter of the main pipeline, which is convenient for connection with the main pipeline. The inner wall of the cubic expansion sound cavity is an acoustic black hole structure, and a sink groove is opened in the middle of its outer wall, and damping material is attached to the sink groove. The length of the damping material is equal to the side length of the cubic expansion sound cavity, and the width l 1 It should not be less than 20% of the side length of the cubic expansion sound cavity to facilitate the damping material to absorb vibration energy.

[0039] Related technologies disclose a side suction pipe muffler structure and application based on the acoustic black hole effect. When the sound wave propagates through the main pipe to the acoustic black hole component, its energy will be concentrated in the muffler due to the acoustic black hole effect, and dissipated through the damping of porous materials or air itself. This structure does not change the inner diameter of the main pipe, does not reduce the flow rate of the medium in the main pipe, does not generate new flow noise, and can achieve the purpose of better noise reduction. However, its acoustic black hole structure is extremely complex, and it needs to arrange many metal baffles, which is difficult to process and has a high application cost.

[0040] The related technology discloses an inner tube structure and a refrigeration device, in which the outer tube in the inner tube structure is arranged into a large-diameter section, a gradient section and a connecting section which are connected in sequence along the axial direction, and the first tube cavity in the outer tube extends from the large-diameter section through the gradient section to part of the connecting section, and the inner tube is inserted into the connecting end axially from the end face of the connecting section, and extends into the first tube cavity, so that the vibration energy of the inner tube can be transmitted from the connecting end to the gradient section and the large-diameter section, and the vibration energy can be dissipated and weakened in the process of vibration transmission from large to small cross-sectional area. In addition, sound-absorbing panels and micro-perforated panels are installed in the inner tube to reduce noise. However, it has many structural components, and there are many components that are difficult to process, making it difficult to achieve low-cost mass application in air-conditioning systems.

[0041] Related technology discloses a silencer, a compressor and a refrigeration device thereof, wherein the air inlet and the air outlet are connected to form a channel that runs through the main body, one end of the cavity is closed, and the other end of the cavity is connected to the channel, and the caliber of the channel gradually decreases from the air inlet toward the air outlet, and multiple cavities surround the channel and are independently arranged. Using the principle of acoustic black holes, the caliber of the channel gradually decreases from the air inlet toward the air outlet, reducing the transmission of sound waves in the channel. At the same time, the sound waves enter each cavity, and are constantly reflected in the cavity to form reflected waves, which are then reflected from the cavity and offset with the sound waves in the channel that are about to enter the cavity, thereby achieving noise reduction and reducing the noise of the compressor. However, the channel silencer has a complex structure and is difficult to process, making it difficult to apply in large quantities.

[0042] In some embodiments, the first tube body 2 and the second tube body 3 at least partially extend into the cavity. The length of the first tube body 2 extending into the cavity and the length of the second tube body 3 extending into the cavity are less than half the height of the main body 1. In this technical solution, both ends of the cubic expansion sound cavity include inner tubes with the same diameter as the main pipeline, and the length of the inner tube is l 3 It should be less than h / 2, where h is the height of the main body 1. The inner wall of the cubic expansion sound cavity is an acoustic black hole structure, and a sink groove is opened in the middle of its outer wall, and damping material is attached to the sink groove. The length of the damping material is equal to the side length of the cubic expansion sound cavity, and the width l 1It should not be less than 20% of the side length of the cubic expansion sound cavity to facilitate the damping material to absorb vibration energy.

[0043] Acoustic Black Hole (ABH) is the acoustic analogy of the concept of black hole in astrophysics. It is a structure that has a convergence effect on bending waves through changes in geometric parameters or material properties. Under absolutely ideal conditions, the speed of bending waves gradually decreases to zero in the acoustic black hole region.

[0044] Vibration is essentially a standing wave generated by multiple reflections of elastic waves at the boundaries of the structure, and noise is the wave energy radiated to the surrounding space during the vibration of the structure. Figure 4 As shown, the acoustic black hole structure changes exponentially from the outside to the inside, and the geometric size parameter changes according to the formula y=x2 / 6+h, where h is greater than 0. Figure 6 As shown, the pipeline noise reduction device of the present invention can achieve effective absorption in the frequency band of 0-3150Hz; TL is the noise transmission loss, which refers to the energy loss caused by interface reflection, absorption and scattering when sound waves are transmitted from one medium to another. It is one of the important indicators to measure the sound insulation performance of materials or structures. Specifically, the noise transmission loss indicates the degree of reduction in the sound energy level of a sound wave after it passes through a certain material or structure. In addition, the structures with different inner tube lengths are simulated and analyzed, and it is found that the increase in the inner tube length helps to improve the absorption effect of high-frequency noise.

[0045] See also Figure 6 As shown in the figure, after adopting the inner tube structure, the transmission loss curve performs better at high frequencies, and as the length of the inner tube increases, the absorption effect of high-frequency noise is better.

[0046] In some embodiments, the damping member is disposed on an outer side wall of the main body 1 , and the length of the damping member is the same as the height of the main body 1 .

[0047] The pipeline noise reduction device of the present invention can also be connected in series in the main pipeline of the air conditioner in the form of multiple pipeline noise reduction devices, and multiple numbers of them are connected in series in the axial direction of the main pipeline to further improve the sound reduction amount in a specific frequency band.

[0048] The pipeline noise reduction device of the present invention solves the noise and vibration problems of the air conditioning system pipeline without changing the inner diameter of the main pipeline and reducing the refrigerant flow rate in the main pipeline. On the one hand, the expansion cavity structure can achieve effective noise reduction in the 0-3200Hz frequency band; on the other hand, the combined effect of the acoustic black hole structure and the damping material can greatly reduce the vibration of the pipeline system. The inner walls of the main body 1 are all set to the acoustic black hole structure, which is more conducive to having a better vibration reduction effect.

[0049] The specific structure of the inner wall of the acoustic black hole in the pipeline noise reduction device of the present invention is to design the inner wall as an arc surface, and the variation law of the geometric size parameters of the acoustic black hole follows the formula y=x 2 / 6+h, h is greater than 0, and it conforms to the power exponential function; its characteristic is that it can "gather" vibrations to the thinnest part. Therefore, damping material is pasted at its thinnest part to achieve optimal vibration reduction.

[0050] Due to the adoption of the pipeline noise reduction device of the present invention, compared with ordinary pipelines, the noise in the frequency band of 0-3200Hz of the air conditioning system pipeline is effectively reduced; further, the noise transmission loss in the frequency band of 1000-3200Hz is improved through the inner pipe structure. In addition, the acoustic black hole structure is used to gather the pipeline vibration energy at the surface of the vibration reduction and noise reduction device, and then the damping material is used to absorb the vibration energy, greatly reducing the vibration of the pipeline system.

[0051] The transmission loss (noise reduction) is calculated according to the following formula:

[0052]

[0053] Where ρc represents the acoustic impedance of the fluid medium, P IRe With P IIm denote the real and imaginary parts of the inlet sound pressure, respectively, A i Indicates the inlet cross-sectional area, P ORe With P OIm Represent the real and imaginary parts of the sound pressure at the outlet, A o According to the above formula, the transmission loss of the embodiment of the present invention is numerically calculated. The size parameters of the main body 1 in this embodiment are shown in Table 1 below. Figure 5 shown.

[0054] Table 1 Dimensional parameters

[0055] a length 30[mm] b width 30[mm] h high 30[mm] <![CDATA[l 1 ]]> Groove width 8[mm] d Neck diameter 8[mm] <![CDATA[l 2 ]]> Neck length 10[mm] <![CDATA[l 3 ]]> Inner tube length /

[0056] It can be seen from the results that the present invention effectively reduces the noise in the frequency band of 0-3200Hz; in addition, the noise transmission loss in the frequency band of 1000-3200Hz can be further improved by setting the inner insert tube, and the noise transmission loss in this frequency band increases with the increase of the length of the inner insert tube. It should be noted that the width l1 of the sink for attaching the damping material should not be less than 20% of the width b, so that the damping material can absorb vibration energy; the length l3 of the inner insert tube should be less than h / 2.

[0057] The present invention also provides an air conditioner, comprising the above-mentioned pipeline noise reduction device.

[0058] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A pipeline noise reduction device, characterized in that: include: A main body (1), the main body (1) having a cavity therein, a first tube body (2) being arranged at one end of the main body (1), a second tube body (3) being arranged at the other end of the main body (1), the first tube body (2) and the second tube body (3) being communicated with the cavity, an inner side wall of the main body (1) having an arc-shaped surface (5), a damping member being arranged on the main body (1), and the damping member being arranged opposite to the center of the arc-shaped surface (5).

2. The pipeline noise reduction device according to claim 1, characterized in that: The center point of the cavity is located on the center axis of the first tube (2), and / or the center point of the cavity is located on the center axis of the second tube (3).

3. The pipeline noise reduction device according to claim 1, characterized in that: The inner side walls of at least two of the main bodies (1) have an arcuate surface (5), and the radial direction of the arcuate surface (5) is the same as the radial direction of the first tube body (2).

4. The pipeline noise reduction device according to claim 1, characterized in that: Along the axial direction of the first tube body (2), the center line of the arcuate surface (5) coincides with the center line of the inner wall of the main body (1).

5. The pipeline noise reduction device according to claim 1, characterized in that: The outer wall of the main body (1) is provided with a groove (4), and along the axial direction of the first tube (2), the groove (4) penetrates the main body (1), and the damping element is arranged in the groove (4).

6. The pipeline noise reduction device according to claim 5, characterized in that: The main body (1) has a cubic structure, the side length of the main body (1) is 3.75 times the radius of the first tube (2), and the width of the groove (4) is not less than 20% of the side length of the main body (1).

7. The pipeline noise reduction device according to claim 5, characterized in that: The first tube body (2) and the second tube body (3) at least partially extend into the cavity.

8. The pipeline noise reduction device according to claim 7, characterized in that: The length of the portion of the first tube (2) extending into the cavity and the length of the portion of the second tube (3) extending into the cavity are less than half the height of the main body (1).

9. The pipeline noise reduction device according to claim 1, characterized in that: The damping member is arranged on the outer side wall of the main body (1), and the length of the damping member is the same as the height of the main body (1).

10. An air conditioner, characterized in that: The pipeline noise reduction device comprises the pipeline noise reduction device according to any one of claims 1 to 9.

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