Noise reduction pipeline and air conditioner

Abstract

The present invention discloses a noise-reducing pipeline and an air conditioner, and relates to the technical field of air conditioning. The noise-reducing pipeline includes a ventilation duct, a connecting pipe, and a silencer. One end of the connecting pipe is connected to the side wall of the ventilation duct, and the other end is connected to the silencer. The cross-sectional area of ​​the silencer is larger than the cross-sectional area of ​​the connecting pipe. The ventilation duct is used to supply gaseous refrigerant circulation, and the silencer is used to reduce the noise generated by the flow of gaseous refrigerant. Compared with the prior art, the noise-reducing pipeline provided by the present invention adopts a ventilation duct for supplying gaseous refrigerant circulation and a silencer connected to the ventilation duct through a connecting pipe. Therefore, it can reduce the noise generated by the compressed refrigerant while ensuring stability, has a good noise reduction effect, and can improve versatility and save economic costs.

Description

Technical Field

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

[0002] While air conditioning technology has been rapidly improving in terms of cooling and heating performance, reliability, and safety, noise performance still presents significant challenges. The most prominent issue is the noise transmitted along the pipelines by the pressure pulsation caused by the compressor's rotation and compression of the refrigerant. Currently, to reduce the noise caused by the pressure pulsation caused by the compressor's rotation and compression of the refrigerant, methods typically employed include adjusting the size of the shutoff valve opening or adding damping blocks to the pipelines. However, these solutions, due to their manual nature, are subject to high uncertainty, are significantly affected by ambient temperature and manual operation, and are therefore less stable, less versatile, and have a high economic cost. Summary of the Invention

[0003] The problem solved by the present invention is how to reduce the noise generated by the compressed refrigerant while ensuring stability, and the noise reduction effect is good, and the versatility can be improved, saving economic costs.

[0004] To solve the above problems, the technical solution of the present invention is achieved as follows:

[0005] In a first aspect, the present invention provides a noise-reducing pipeline comprising a ventilation duct, a connecting pipe, and a silencer, wherein one end of the connecting pipe is connected to the side wall of the ventilation duct, and the other end is connected to the silencer, wherein the cross-sectional area of ​​the silencer is larger than the cross-sectional area of ​​the connecting pipe, the ventilation duct is used to circulate a gaseous refrigerant, and the silencer is used to reduce the noise generated by the flow of the gaseous refrigerant. Compared with the prior art, the noise-reducing pipeline provided by the present invention can reduce the noise generated by the compressed refrigerant while maintaining stability due to the use of a ventilation duct for circulating a gaseous refrigerant and a silencer connected to the ventilation duct via a connecting pipe, thereby achieving good noise reduction effect, improving versatility, and saving economic costs.

[0006] Furthermore, the ventilation duct includes an air inlet pipe, a noise reduction pipe, and an air outlet pipe. The air inlet pipe is connected to the air outlet pipe through the noise reduction pipe. The cross-sectional area of ​​the noise reduction pipe is larger than the cross-sectional areas of the air inlet pipe and the air outlet pipe. The noise reduction pipe is used to reduce the noise generated by the flow of gaseous refrigerant, thereby further improving the noise reduction effect.

[0007] Furthermore, the connecting pipe is connected to the side wall of the air intake pipe and is arranged perpendicular to the axial direction of the air intake pipe. This facilitates installation, has strong versatility, and makes the entire noise-reducing pipe structure compact, making it suitable for use in scenarios where pipe space is limited, such as air conditioners.

[0008] Furthermore, the distance between the connecting pipe and the noise reduction pipe in the axial direction of the intake pipe ranges from 185 mm to 225 mm. A reasonable distance between the connecting pipe and the noise reduction pipe in the axial direction of the intake pipe can save space while increasing transmission loss and reducing noise.

[0009] Furthermore, the air inlet pipe, the noise reduction pipe and the air outlet pipe are coaxially arranged, and the cross-sectional area of ​​the air inlet pipe is equal to the cross-sectional area of ​​the air outlet pipe and is equal to one third of the cross-sectional area of ​​the noise reduction pipe, so as to maximize the noise reduction effect while saving space.

[0010] Furthermore, the length of the noise reduction pipe ranges from 260 mm to 300 mm. A reasonable length of the noise reduction pipe can save space while increasing transmission loss and reducing noise.

[0011] Furthermore, there are two connecting pipes and two silencers, each of which is connected to the two connecting pipes in a one-to-one correspondence, with one connecting pipe connected to the air inlet pipe and the other connected to the air outlet pipe. This simultaneously silences and reduces the noise of the gaseous refrigerant flowing in the air inlet and air outlet pipes, further improving the noise reduction effect.

[0012] Furthermore, the connecting pipe is coaxially arranged with the silencer, and the volume of the silencer is calculated as follows: V = 61000S0, where S0 is the cross-sectional area of ​​the connecting pipe, so as to reduce noise to the greatest extent.

[0013] Furthermore, the length of the connecting pipe ranges from 60 mm to 90 mm. A reasonable length of the connecting pipe 120 can minimize the size while ensuring the noise reduction effect, so as to facilitate installation and save space.

[0014] In a second aspect, the present invention provides an air conditioner comprising the aforementioned noise-reducing piping, comprising a ventilation duct, a connecting pipe, and a silencer. The connecting pipe has one end connected to a side wall of the ventilation duct and the other end connected to the silencer, wherein the cross-sectional area of ​​the silencer is larger than the cross-sectional area of ​​the connecting pipe. The ventilation duct is configured to circulate gaseous refrigerant, and the silencer is configured to reduce noise generated by the flow of the gaseous refrigerant. The air conditioner can reduce noise generated by compressed refrigerant while maintaining stability, achieving excellent noise reduction, improving versatility, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an isometric view of the noise reduction pipeline according to the first embodiment of the present invention;

[0016] Figure 2 is a cross-sectional view of the noise reduction pipeline according to the first embodiment of the present invention;

[0017] Figure 3 is a mathematical model diagram of the noise reduction pipeline according to the first embodiment of the present invention;

[0018] Figure 4 This is a mathematical model diagram of the connection between the connecting pipe and the silencer in the noise reduction pipeline according to the first embodiment of the present invention;

[0019] Figure 5 is a cross-sectional view of a noise reduction pipeline according to a second embodiment of the present invention;

[0020] Figure 6 4 is a cross-sectional view of a noise reduction pipeline according to a third embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 100-noise reduction pipe; 110-ventilation pipe; 111-inlet pipe; 112-noise reduction pipe; 113-outlet pipe; 120-connecting pipe; 130-silencer. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] First embodiment

[0025] Please refer to Figure 1 The present invention provides a noise-reducing pipeline 100 for reducing the noise generated by the flow of refrigerant. This pipeline 100 can reduce the noise generated by the compressed refrigerant while maintaining stability, achieving excellent noise reduction effects, improving versatility, and saving costs.

[0026] It should be noted that the noise-reducing pipe 100 is applied to an air conditioner (not shown), which can blow out hot or cold air to achieve heating or cooling functions. Specifically, during the heating or cooling process, the air conditioner requires a compressor (not shown) to compress the refrigerant. The pressure pulsation caused by the compressed refrigerant can cause noise. The noise-reducing pipe 100 is used to supply the gaseous refrigerant flow, thereby reducing the noise generated by the compressed refrigerant.

[0027] The noise reduction pipeline 100 includes a ventilation duct 110, a connecting pipe 120, and a silencer 130. One end of the connecting pipe 120 is connected to the side wall of the ventilation duct 110, and the other end is connected to the silencer 130. The ventilation duct 110 is connected to the silencer 130 through the connecting pipe 120. The silencer 130 is in a closed cylindrical shape, and the connecting pipe 120 is the only air inlet and outlet passage of the silencer 130. The ventilation duct 110 is used to supply gaseous refrigerant for circulation. The gaseous refrigerant in the ventilation duct 110 can enter the silencer 130 through the connecting pipe 120, and can also flow out from the silencer 130 through the connecting pipe 120 to the ventilation duct 110. Specifically, the cross-sectional area of ​​the silencer 130 is larger than the cross-sectional area of ​​the connecting pipe 120. The silencer 130 is used to reduce the noise generated by the flow of the gaseous refrigerant, has a good noise reduction effect, and can improve versatility and save economic costs.

[0028] It is worth noting that in the process of gaseous refrigerant flowing into the ventilation duct 110, the noise caused by the pressure pulsation changes caused by the compressed refrigerant propagates in the ventilation duct 110. The purpose of noise reduction is achieved by utilizing the change in the acoustic impedance at the junction of the ventilation duct 110 and the connecting pipe 120, and the noise reduction effect is not affected by ambient temperature and manual operation factors.

[0029] Furthermore, when the sound wave reaches the junction of the ventilation duct 110 and the connecting pipe 120, the sound wave is divided into three parts. The first part of the sound wave is reflected back to form a reflected wave, which cancels out the forward propagating sound wave to eliminate part of the noise; the second part of the sound wave continues to propagate forward along the ventilation duct 110 to form a transmitted wave; the third part of the sound wave enters the connecting pipe 120. Due to the pressure at both ends of the connecting pipe 120 and its own structural dimensions, there is mass impedance in the connecting pipe 120, thereby achieving the purpose of preliminary silencer. The third part of the sound wave entering the connecting pipe 120 will also enter the silencer 130. In the silencer 130, the gaseous refrigerant is compressed and expanded, resulting in a change in the density of the gaseous refrigerant in the silencer 130. The mass of the gaseous refrigerant entering the silencer 130 is equal to the change in the mass of the gaseous refrigerant in the silencer 130. The volumetric mass acoustic impedance in the silencer 130 changes with the change in volume, thereby achieving the purpose of deep silencer. In this way, both the first part of the sound waves and the third part of the sound waves can be effectively silenced, and the noise reduction effect is good.

[0030] Please refer to Figure 2 、 Figure 3 and Figure 4The ventilation duct 110 includes an air inlet pipe 111, a noise reduction pipe 112, and an air outlet pipe 113. The air inlet pipe 111 is connected to the air outlet pipe 113 through the noise reduction pipe 112, and the gaseous refrigerant flows outward through the air inlet pipe 111, the noise reduction pipe 112, and the air outlet pipe 113 in sequence. Specifically, the cross-sectional area of ​​the noise reduction pipe 112 is larger than the cross-sectional areas of the air inlet pipe 111 and the air outlet pipe 113. The noise reduction pipe 112 is used to reduce the noise generated by the flow of the gaseous refrigerant, thereby further improving the noise reduction effect.

[0031] It is worth noting that as the gaseous refrigerant flows sequentially through the inlet pipe 111, the noise reduction pipe 112, and the outlet pipe 113, the second portion of the sound wave continues to propagate forward. When the second portion of the sound wave reaches the junction of the inlet pipe 111 and the noise reduction pipe 112, due to the different cross-sectional areas of the inlet pipe 111 and the noise reduction pipe 112, a portion of the second portion of the sound wave is reflected back, forming a reflected wave. This reflected wave and the forward-propagating second portion of the sound wave cancel each other out, thereby partially eliminating the noise. Another portion of the second portion of the sound wave enters the noise reduction pipe 112. When the sound wave that enters the noise reduction pipe 112 reaches the junction of the noise reduction pipe 112 and the outlet pipe 113, due to the different cross-sectional areas of the noise reduction pipe 112 and the outlet pipe 113, a portion of it is reflected back, while the other portion is transmitted into the outlet pipe 113 and continues to propagate. During this process, the second portion of the sound wave undergoes a first expansion and a second compression, resulting in transmission loss, greatly attenuating the sound energy. This effectively silences the second portion of the sound wave, further enhancing the noise reduction effect.

[0032] In this embodiment, connecting pipe 120 is connected to the side wall of intake pipe 111 and is arranged perpendicular to the axial direction of intake pipe 111, facilitating installation and enhancing versatility. This also makes the entire noise-reducing pipe 100 compact and suitable for applications with limited piping space, such as air conditioners. Specifically, muffler 130 communicates with intake pipe 111 via connecting pipe 120, and muffler 130 muffles and reduces the noise of the gaseous refrigerant flowing within intake pipe 111.

[0033] It should be noted that when the sound wave propagates in the intake pipe 111, the connecting pipe 120 and the muffler 130, the transmission loss is:

[0034]

[0035] Wherein, f is the resonant frequency of the noise reduction pipeline 100 when the acoustic reactance is zero, and the resonant frequency is:

[0036]

[0037] Where, f r is the actual frequency; S0 is the cross-sectional area of ​​the connecting pipe 120; S1 is the cross-sectional area of ​​the intake pipe 111; L1 is the length of the connecting pipe 120; and V is the volume of the muffler 130.

[0038] Specifically, the cross-sectional area of ​​the air intake pipe 111 has no effect on the resonance frequency, while as the cross-sectional area of ​​the air intake pipe 111 increases, the amplitude of the transmission loss decreases and the frequency band becomes narrower. However, since the air inlet and outlet pipes 113 of the air conditioner generally adopt standardized diameters, the transmission loss can only be increased and the noise reduction effect improved by adjusting the length of the connecting pipe 120, the cross-sectional area of ​​the connecting pipe 120 and the volume of the silencer 130.

[0039] In this embodiment, the connecting pipe 120 and the silencer 130 are coaxially arranged, and the volume of the silencer 130 is calculated as follows: V=61000S0, where S0 is the cross-sectional area of ​​the connecting pipe 120, so as to reduce noise to the greatest extent.

[0040] Furthermore, the length of the connecting tube 120 ranges from 60 mm to 90 mm. A suitable length of the connecting tube 120 can minimize the size while ensuring noise reduction, facilitating installation and saving space. In this embodiment, the length of the connecting tube 120 is 75 mm, but this is not limiting. In other embodiments, the length of the connecting tube 120 can be 60 mm or 90 mm. The length of the connecting tube 120 is not specifically limited and needs to be adjusted based on the actual frequency of the noise.

[0041] It's worth noting that the noise caused by pressure pulsations caused by compressed refrigerant is generally low-frequency, with an actual frequency range of 68 Hz to 85 Hz. Increasing the length of connecting pipe 120, increasing the volume of muffler 130, and reducing the cross-sectional area of ​​connecting pipe 120 reduces the resonant frequency. According to calculations, when L1 = 75 mm, S0 = 3.14 mm², and V = 61,000 * 3.14 = 191,540 mm³, noise between 75 Hz and 85 Hz can be effectively attenuated.

[0042] It should be noted that when the sound wave propagates in the air inlet pipe 111, the noise reduction pipe 112 and the air outlet pipe 113, the transmission loss is:

[0043]

[0044] Where m is the expansion ratio, which is:

[0045]

[0046] Wherein, L2 is the axial distance between the connecting pipe 120 and the noise reduction pipe 112 in the intake pipe 111; L3 is the length of the noise reduction pipe 112; λ is the wavelength; S1 is the cross-sectional area of ​​the intake pipe 111; and S2 is the cross-sectional area of ​​the noise reduction pipe 112.

[0047] In this embodiment, the air inlet pipe 111, the noise reduction pipe 112, and the air outlet pipe 113 are coaxially arranged. The cross-sectional area of ​​the air inlet pipe 111 is equal to the cross-sectional area of ​​the air outlet pipe 113, and is also equal to one-third of the cross-sectional area of ​​the noise reduction pipe 112. This saves space while maximizing the noise reduction effect. Specifically, S3 is the cross-sectional area of ​​the air outlet pipe 113, and S1 = S3.

[0048] Furthermore, the axial spacing between the connecting pipe 120 and the noise reduction pipe 112 in the intake pipe 111 ranges from 185 mm to 225 mm. A reasonable axial spacing between the connecting pipe 120 and the noise reduction pipe 112 in the intake pipe 111 can save space while increasing transmission losses and reducing noise. In this embodiment, the axial spacing between the connecting pipe 120 and the noise reduction pipe 112 in the intake pipe 111 is 205 mm, but is not limited thereto. In other embodiments, the axial spacing between the connecting pipe 120 and the noise reduction pipe 112 in the intake pipe 111 can be 185 mm or 225 mm. There is no specific limitation on the axial spacing between the connecting pipe 120 and the noise reduction pipe 112 in the intake pipe 111 and it needs to be adjusted according to the actual frequency of the noise.

[0049] Furthermore, the length of the noise reduction tube 112 ranges from 260 mm to 300 mm. A suitable length of the noise reduction tube 112 can save space while increasing transmission loss and reducing noise. In this embodiment, the length of the noise reduction tube 112 is 283.5 mm, but this is not limiting. In other embodiments, the length of the noise reduction tube 112 can be 260 mm or 300 mm. There is no specific limitation on the length of the noise reduction tube 112 and it needs to be adjusted based on the actual frequency of the noise.

[0050] It is worth noting that the distance L2 between the connecting pipe 120 and the noise reduction pipe 112 in the axial direction of the intake pipe 111 is set to 205 mm. As the expansion ratio m increases, the transmission loss increases. Considering the limited space, m is set to 3.

[0051] when Right now When the expansion ratio m=3, the transmission loss is the largest. At this time, the relationship between the wavelength λ and the length L3 of the noise reduction tube 112 is:

[0052] The corresponding actual frequency Thus, it is calculated that when the length L3 of the noise reduction tube 112 is 283.5 mm, the noise of 68 Hz to 72 Hz can be effectively reduced.

[0053] In this embodiment, the silencer 130 is used to reduce noise from 75 Hz to 85 Hz, and the noise reduction tube 112 is used to reduce noise from 68 Hz to 72 Hz, so as to minimize the noise caused by pressure pulsation changes caused by compressed refrigerant and improve user comfort.

[0054] In the noise-reducing pipeline 100 described in an embodiment of the present invention, one end of the connecting pipe 120 is connected to the side wall of the ventilation pipe 110, and the other end is connected to the muffler 130. The cross-sectional area of ​​the muffler 130 is larger than the cross-sectional area of ​​the connecting pipe 120. The ventilation pipe 110 is used to circulate the gaseous refrigerant, and the muffler 130 is used to reduce the noise generated by the flow of the gaseous refrigerant. Compared with the prior art, the noise-reducing pipeline 100 provided by the present invention can reduce the noise generated by the compressed refrigerant while ensuring stability due to the use of the ventilation pipe 110 for circulating the gaseous refrigerant and the muffler 130 connected to the ventilation pipe 110 via the connecting pipe 120. Therefore, it has a good noise reduction effect, can improve versatility, and save economic costs.

[0055] Second embodiment

[0056] Please refer to Figure 5 The embodiment of the present invention provides a noise reduction pipeline 100. Compared with the first embodiment, the difference of this embodiment is that the connection position of the connecting pipe 120 is different.

[0057] In this embodiment, the connecting pipe 120 is connected to the side wall of the outlet pipe 113 and is arranged perpendicular to the axial direction of the outlet pipe 113. The muffler 130 is connected to the outlet pipe 113 through the connecting pipe 120. The muffler 130 can muffle and reduce the noise of the gaseous refrigerant flowing in the outlet pipe 113, and can also achieve a good noise reduction effect. However, this is not limited to this. In other embodiments, the connecting pipe 120 is connected to the side wall of the noise reduction pipe 112 and is arranged perpendicular to the axial direction of the noise reduction pipe 112. The muffler 130 is connected to the noise reduction pipe 112 through the connecting pipe 120. The muffler 130 can muffle and reduce the noise of the gaseous refrigerant flowing in the noise reduction pipe 112. The connection position of the connecting pipe 120 is not specifically limited.

[0058] The beneficial effects of the noise reduction pipeline 100 described in the embodiment of the present invention are the same as those of the first embodiment, and will not be repeated here.

[0059] Third embodiment

[0060] Please refer to Figure 6 The embodiment of the present invention provides a noise reduction pipeline 100. Compared with the first embodiment, the difference of this embodiment lies in the different number of connecting pipes 120 and silencers 130.

[0061] In this embodiment, there are two connecting pipes 120 and two silencers 130, each of which is connected to the two connecting pipes 120 in a one-to-one correspondence. One connecting pipe 120 is connected to the air inlet pipe 111, and the other connecting pipe 120 is connected to the air outlet pipe 113. The two silencers 130 work together to simultaneously silence and reduce the noise of the gaseous refrigerant flowing in the air inlet pipe 111 and the air outlet pipe 113, further improving the noise reduction effect. However, it is not limited to this. In other embodiments, one of the connecting pipes 120 is connected to the air intake pipe 111, and the other connecting pipe 120 is connected to the noise reduction pipe 112; or one of the connecting pipes 120 is connected to the noise reduction pipe 112, and the other connecting pipe 120 is connected to the air outlet pipe 113; or the number of connecting pipes 120 and the silencer 130 are both three, the first connecting pipe 120 is connected to the air intake pipe 111, the second connecting pipe 120 is connected to the noise reduction pipe 112, and the third connecting pipe 120 is connected to the air outlet pipe 113; there is no specific limitation on the number and setting position of the connecting pipes 120 and the silencer 130.

[0062] The beneficial effects of the noise reduction pipeline 100 described in the embodiment of the present invention are the same as those of the first embodiment, and will not be repeated here.

[0063] Fourth embodiment

[0064] The present invention provides an air conditioner for controlling indoor temperature. The air conditioner includes a noise-reducing pipeline 100 and a compressor. The basic structure, principles, and technical effects of the noise-reducing pipeline 100 are the same as those of the first embodiment. For the sake of brevity, any details not mentioned in this embodiment are referred to the corresponding contents of the first embodiment.

[0065] In this embodiment, the compressor is connected to the noise reduction pipeline 100. The compressor is used to compress the refrigerant so that the gaseous refrigerant flows in the noise reduction pipeline 100. The noise reduction pipeline 100 is used to reduce the noise caused by the pressure pulsation changes caused by the compressed refrigerant.

[0066] The beneficial effects of the air conditioner according to the embodiment of the present invention are the same as those of the first embodiment, and are not described in detail here.

[0067] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A noise reduction pipeline, characterized in that: The invention comprises a ventilation pipe (110), a connecting pipe (120) and a silencer (130), wherein one end of the connecting pipe (120) is connected to the side wall of the ventilation pipe (110), and the other end is connected to the silencer (130), and the cross-sectional area of ​​the silencer (130) is larger than the cross-sectional area of ​​the connecting pipe (120). The ventilation pipe (110) is used for supplying gaseous refrigerant to circulate, and the silencer (130) is used for reducing noise generated by the flow of the gaseous refrigerant. The ventilation duct (110) includes an air inlet pipe (111), a noise reduction pipe (112), and an air outlet pipe (113); the air inlet pipe (111) is connected to the air outlet pipe (113) through the noise reduction pipe (112); the cross-sectional area of ​​the noise reduction pipe (112) is larger than the cross-sectional areas of the air inlet pipe (111) and the air outlet pipe (113); the noise reduction pipe (112) is used to reduce the noise generated by the flow of the gaseous refrigerant; The connecting pipe (120) and the muffler (130) are coaxially arranged. The volume of the muffler (130) is calculated as follows: V=61000 , where is the cross-sectional area of ​​the connecting pipe (120); The length of the connecting pipe (120) ranges from 60 mm to 90 mm.

2. The noise reduction pipeline according to claim 1, characterized in that: The connecting pipe (120) is connected to the side wall of the air intake pipe (111) and is arranged perpendicular to the axial direction of the air intake pipe (111).

3. The noise reduction pipeline according to claim 2, characterized in that: The distance between the connecting pipe (120) and the noise reduction pipe (112) in the axial direction of the air intake pipe (111) ranges from 185 mm to 225 mm.

4. The noise reduction pipeline according to claim 1, characterized in that: The air inlet pipe (111), the noise reduction pipe (112), and the air outlet pipe (113) are coaxially arranged, and the cross-sectional area of ​​the air inlet pipe (111) is equal to the cross-sectional area of ​​the air outlet pipe (113), and is equal to one third of the cross-sectional area of ​​the noise reduction pipe (112).

5. The noise reduction pipeline according to claim 1, characterized in that: The length of the noise reduction pipe (112) ranges from 260 mm to 300 mm.

6. The noise reduction pipeline according to claim 1, characterized in that: The number of the connecting pipes (120) and the number of the silencers (130) are both two, and the two silencers (130) are connected to the two connecting pipes (120) in a one-to-one correspondence, wherein one of the connecting pipes (120) is connected to the air inlet pipe (111), and the other connecting pipe (120) is connected to the air outlet pipe (113).

7. An air conditioner, characterized in that: The invention comprises the noise reduction pipeline according to any one of claims 1 to 6.

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