Noise reduction joint, air conditioner and noise reduction method

Abstract

The present invention relates to a silencer joint, an air conditioner, and a noise silencing method, and relates to the technical field of silencing. The present invention comprises an intake duct and a frequency silencing duct; the frequency silencing duct comprises a fixed silencing duct and a rotating silencing duct that are rotatably connected, the fixed silencing duct being in communication with the intake duct; wherein the rotating silencing duct can rotate relative to the fixed silencing duct to change the length of the frequency silencing duct, so that the length difference L between the intake duct and the frequency silencing duct and the wavelength λ corresponding to the noise in the intake duct satisfy L = Kλ / 2, where K is an odd number. The technical solution disclosed in this application can solve the problem that traditional duct silencing systems are unable to silence noise of different frequencies.

Description

Technical Field

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

[0002] Air conditioning noise is the noise emitted when the air conditioning system is working, including the noise generated by the fan that escapes into the room and the regeneration noise at the end of the air duct. The noise generated by the fan is the modulated noise generated by the blades hitting the surrounding air when rotating and the irregular noise caused by eddy currents. It is usually necessary to install a silencer structure in the air conditioning duct to silence the noise.

[0003] However, the current air conditioning duct silencer system is unable to silence noises of different frequencies. Summary of the Invention

[0004] The embodiments of the present application provide a silencer joint, an air conditioner, and a noise silencing method, which can solve the problem that the existing traditional pipe silencing system cannot silence noises of different frequencies.

[0005] In a first aspect, an embodiment of the present application provides a sound-absorbing joint, comprising:

[0006] Intake duct;

[0007] A frequency muffler pipe, comprising a fixed muffler pipe and a rotating muffler pipe that are rotatably connected, wherein the fixed muffler pipe is connected to the air intake pipe;

[0008] In which, the rotating silencer pipe can rotate relative to the fixed silencer pipe to change the length of the frequency silencer pipe, so that the length difference L between the intake pipe and the frequency silencer pipe and the wavelength λ corresponding to the noise in the intake pipe satisfy L=Kλ / 2, where K is an odd number.

[0009] In one embodiment, the muffler joint includes a shell and two partitions;

[0010] The two partitions respectively form fixed silencers with the shell, and the two fixed silencers together form the fixed silencer duct, wherein the fixed silencer extends along the circumferential direction of the shell, and the two fixed silencers are arranged in a centrally symmetrical manner.

[0011] In one embodiment, the air intake duct is arranged in the shell, and the air intake duct has a silencer inlet and a silencer outlet. One of the two fixed silencers is connected to the silencer inlet, and the other of the two fixed silencers is connected to the silencer outlet.

[0012] In one embodiment, the rotating silencer pipe is disposed in the housing, and the rotating silencer pipe includes a rotating transition portion and two rotating silencer portions;

[0013] The two ends of the rotation transition portion are respectively connected to the two rotation muffler portions, and the rotation transition portion extends along the radial direction of the shell;

[0014] The two rotating sound-absorbing parts correspond to the two fixed sound-absorbing parts one by one, and the rotating sound-absorbing parts are rotationally connected to the corresponding fixed sound-absorbing parts.

[0015] In one embodiment, the rotating silencer pipe is disposed in the housing, and the rotating silencer pipe includes a rotating transition portion, two rotating transition portions, and two rotating silencer portions;

[0016] The support portion extends along the radial direction of the housing, one end of the support portion is connected to one of the two rotation transition portions, and the other end of the support portion is connected to the other of the two rotation transition portions;

[0017] The rotation transition portion extends along the circumferential direction of the shell and is coaxially arranged with the shell, the two rotation transition portions correspond to the two rotation muffler portions one by one, and one end of the rotation transition portion that is not connected to the support portion is connected to the corresponding rotation muffler portion;

[0018] The two rotating sound-absorbing parts correspond to the two fixed sound-absorbing parts one by one, and the rotating sound-absorbing parts are rotationally connected to the corresponding fixed sound-absorbing parts.

[0019] In one embodiment, the sum of the radian of the rotating muffler portion and the radian of the corresponding fixed muffler portion is not less than π.

[0020] In one embodiment, the muffler joint comprises:

[0021] A silencer mounting member, which is arranged on the rotating silencer pipe;

[0022] A driving assembly is arranged on the shell, and the driving assembly is connected to the silencer mounting member to drive the rotating silencer pipe to rotate.

[0023] In one embodiment, the driving assembly includes a driving member and a driving mounting member, and the driving member is mounted on the housing via the driving mounting member.

[0024] In a second aspect, an embodiment of the present application provides an air conditioner, comprising a silencer joint as described in any embodiment of the first aspect.

[0025] In a third aspect, an embodiment of the present application provides a noise cancellation method, comprising:

[0026] Obtain the wavelength λ corresponding to the noise in the intake duct;

[0027] The rotating muffler pipe is adjusted to rotate relative to the fixed muffler pipe so that the length difference L between the air intake pipe and the frequency muffler pipe and the wavelength λ satisfy L=Kλ / 2, where K is an odd number.

[0028] In one embodiment, obtaining the wavelength λ corresponding to the noise in the intake duct includes:

[0029] Get the speed of the air conditioner fan and the number of blades of the air conditioner fan;

[0030] Calculating the noise frequency of the air conditioning fan based on the rotational speed and the number of blades;

[0031] The wavelength λ is calculated based on the noise frequency.

[0032] In one embodiment, the adjusting the rotating muffler pipe so that the rotating muffler pipe rotates relative to the fixed muffler pipe so that the length difference L between the air intake pipe and the frequency muffler pipe and the wavelength λ satisfy L=Kλ / 2, where K is an odd number, includes:

[0033] Calculate the length difference L between the air intake duct and the frequency muffler duct based on the noise frequency;

[0034] The target rotation angle of the rotating silencer pipe is calculated based on the length difference L, and the rotating silencer pipe is driven to rotate to the target rotation angle by a driving component to achieve the length difference L to eliminate or reduce the noise passing through the silencer joint.

[0035] Compared with the prior art, the advantage of the embodiments of the present application is that a frequency silencer pipe is formed by a rotating silencer pipe and a fixed silencer pipe that are connected by rotation. When it is necessary to silence noises of different frequencies, the length of the frequency silencer pipe can be adjusted by rotating the rotating silencer pipe relative to the fixed silencer pipe, so that the length difference between the air intake pipe and the frequency silencer pipe reaches an odd multiple of 1 / 2 of the noise frequency wavelength, thereby causing the noisy air in the frequency silencer pipe to interfere with the noisy air in the air intake pipe, thereby eliminating or reducing the noise passing through the silencer joint, solving the problem that the existing traditional pipe silencer system cannot silence noises of different frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings.

[0037] Figure 1 is an exploded view of a muffler joint provided in one embodiment of the present invention;

[0038] Figure 2 yes Figure 1 Figure 1 is an outline diagram of a muffler joint provided in the embodiment;

[0039] Figure 3 yes Figure 1 The assembly diagram of the air intake pipe and the frequency muffler pipe provided in the embodiment;

[0040] Figure 4 is a structural schematic diagram of a rotating muffler pipe provided by another embodiment of the present invention;

[0041] Figure 5 yes Figure 4 A diagram of the noise air flow path in the rotating silencer duct provided in the embodiment;

[0042] Figure 6 is a flow chart of a noise cancellation method provided by another embodiment of the present invention;

[0043] Figure 7 yes Figure 6 The embodiment provides the noise reduction amount corresponding to the noise reduction joint at different target rotation angles.

[0044] Reference numerals:

[0045] 10. Drive assembly; 110. Drive member; 120. Drive mounting member; 20. Shell; 210. Cover plate; 220. Bottom plate; 230. Side plate; 240. Partition member; 2401. First partition section; 2402. Second partition section; 250. Fixed silencer; 30. Air intake duct; 310. Silencer inlet; 40. Rotating silencer duct; 410. Silencer mounting member; 420. Rotating transition section; 430. Rotating silencer; 440. Support section. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the accompanying drawings.

[0047] When air conditioners, fresh air ducts or other duct ventilation systems are working, the rotation of their fan blades cutting the air will generate a lot of noise. These noises will be transmitted into the room and will greatly affect people's user experience. In addition, due to changes in the external environment (temperature, humidity, etc.), it is often necessary to adjust the fan to work at different speeds to ensure the use requirements in different environments or scenarios. This will cause the noise frequency generated by the fan to change, so it is necessary to mute the noise of different frequencies generated by the fan.

[0048] However, the current traditional pipe silencers, such as simple expansion chamber silencers, 1 / 4 wavelength tubes, Helmholtz resonant cavities, interference silencers, or various combinations of the above-mentioned silencer structures, have fixed structural parameters, so the silencer frequency is also fixed, which cannot meet the needs of silencer for noises of different frequencies.

[0049] In order to solve the above technical problems, Figure 1 、 Figure 2 As shown, at least one embodiment of the present application provides a silencer joint, comprising: an air intake duct 30 and a frequency silencer duct; the frequency silencer duct comprises a fixed silencer duct and a rotating silencer duct 40 that are rotatably connected, and the fixed silencer duct is communicated with the air intake duct 30; wherein, the rotating silencer duct 40 can be rotated relative to the fixed silencer duct to change the length of the frequency silencer duct, so that the length difference L between the air intake duct 30 and the frequency silencer duct and the wavelength λ corresponding to the noise in the air intake duct 30 satisfy L=Kλ / 2, where K is an odd number.

[0050] As can be seen from the above, the rotating silencer pipe 40 and the fixed silencer pipe connected by rotation together form a frequency silencer pipe. When it is necessary to silence noises of different frequencies, the length of the frequency silencer pipe can be adjusted by rotating the rotating silencer pipe 40 relative to the fixed silencer pipe, so that the length difference between the air intake pipe 30 and the frequency silencer pipe reaches an odd multiple of 1 / 2 of the noise frequency wavelength, so that the noisy air in the frequency silencer pipe interferes with the noisy air in the air intake pipe 30, thereby eliminating or reducing the noise passing through the silencer joint, solving the problem that the existing traditional pipe silencer system cannot silence noises of different frequencies.

[0051] It should be noted that by rotating the rotating silencer pipe 40 relative to the fixed silencer pipe to adjust the length of the frequency silencer pipe, according to the principle of interference silencer, when the length difference L between the air intake pipe 30 and the frequency silencer pipe and the wavelength λ corresponding to the noise in the air intake pipe 30 satisfy L=Kλ / 2, and K is an odd number, that is, when the phase difference between the noise in the air intake pipe 30 and the noise in the frequency silencer pipe is an odd multiple of 1 / 2 of the noise frequency wavelength, the noise of this frequency can be eliminated. Therefore, by adjusting the length of the frequency silencer pipe, noise of different frequencies can be eliminated or reduced. Moreover, by rotating the connected rotating silencer pipe 40 and the fixed silencer pipe, the volume of the silencer joint can be reduced, which is beneficial for use in a smaller space.

[0052] In some embodiments, the silencer joint includes a shell 20 and two partitions 240; the two partitions 240 respectively form a fixed silencer part 250 with the shell 20, and the two fixed silencer parts 250 together form a fixed silencer pipe, wherein the fixed silencer part 250 extends along the circumferential direction of the shell 20, and the two fixed silencer parts 250 are arranged in a centrally symmetrical manner.

[0053] It should be noted that the fixed silencer pipe can be a separately provided pipe or a pipe enclosed or formed together with the shell 20. For example, when the fixed silencer pipe is a pipe formed together with the shell 20, the partition 240 can be a bent plate, and the partition 240 extends along the circumference of the shell 20, and the radian of the partition 240 is less than π, so that when the rotating silencer pipe 40 rotates in the fixed silencer part 250, the length of the frequency silencer pipe can be changed. If the radian of the partition 240 is greater than or equal to π, the length of the frequency silencer pipe cannot be changed.

[0054] It should also be noted that if Figure 1 、 Figure 3 As shown, the partition 240 includes a first partition segment 2401 and a second partition segment 2402. The partition 240 is composed of the first partition segment 2401 and the second partition segment 2402. The shell 20 includes a cover plate 210, a bottom plate 220, and a side plate 230 connecting the cover plate 210 and the bottom plate 220. The cover plate 210 and the bottom plate 220 are both circular plates, and the side plate 230 is cylindrical. The lower end of the first partition segment 2401 is connected to the bottom plate 220, and the outer side of the second partition segment 2402 and the bottom plate 220 are connected to the side plate 230. The partition 240, the bottom plate 220 and the side plate 230 together form a fixed silencer section, and the curvature of the fixed silencer section is less than π.

[0055] It should also be noted that the heights of the two partitions 240 can be the same or different. For example, the two partitions 240 can be one high and one low. When the air intake duct 30 is horizontally inserted into the shell 20, the heights of the two partitions 240 are the same; when the air intake duct 30 is obliquely inserted into the shell 20, the heights of the two partitions 240 are different. In this way, the rotating silencer duct 40 can be partially located outside the air intake duct 30, and the air intake duct 30 will not block the rotation of the rotating silencer duct 40.

[0056] In some embodiments, the air intake duct 30 is arranged in the shell 20, and the air intake duct 30 has a silencer inlet 310 and a silencer outlet. One of the two fixed silencer parts 250 is connected to the silencer inlet 310, and the other of the two fixed silencer parts 250 is connected to the silencer outlet.

[0057] It should be noted that if Figure 1 、 Figure 3As shown, the air intake duct 30 can be a circular tube, a square tube, or a combination of circular tubes and square tubes. For example, a circular tube is used at the connection point between the air intake duct 30 and the external pipe, and a square tube is used in the middle part. One end of the air intake duct 30 connected to the noise source is the inlet end, and the other end is the outlet end. A silencer inlet 310 is provided on the side wall of the inlet end of the air intake duct 30, and a silencer outlet is provided on the side wall of the outlet end of the air intake duct 30. The silencer inlet 310 and the silencer outlet are located on opposite side surfaces of the air intake duct 30. By providing the silencer inlet 310, the noise introduced from the noise source can be diverted, so that part of the noisy air enters the frequency silencer duct through the silencer inlet 310; by providing the silencer outlet, the air in the frequency silencer duct can be introduced into the outlet end of the air intake duct 30, so that the noisy air in the frequency silencer duct interferes with the noisy air in the air intake duct 30.

[0058] In some embodiments, the rotating silencer duct 40 is arranged in the shell 20, and the rotating silencer duct 40 includes a rotating transition portion 420 and two rotating silencer portions 430; the two ends of the rotating transition portion 420 are respectively connected to the two rotating silencer portions 430, and the rotating transition portion 420 extends along the radial direction of the shell 20; the two rotating silencer portions 430 correspond one-to-one to the two fixed silencer portions 250, and the rotating silencer portion 430 is rotatably connected to the corresponding fixed silencer portions 250.

[0059] It should be noted that the rotating transition portion 420 and the rotating muffler portion 430 are both hollow structures to allow noisy air to flow within the rotating muffler duct 40. The rotating transition portion 420 is located above the two rotating muffler portions 430. When installed, the rotating transition portion 420 is located above the fixed muffler duct, and the longitudinal axis of the rotating muffler duct 40 coincides with the longitudinal axis of the fixed muffler duct and the longitudinal axis of the shell. When the driving assembly 10 drives the rotating muffler duct 40 to rotate, the rotating muffler portion 430 rotates relative to the fixed muffler portion 250, that is, rotates into or out of the fixed muffler portion 250 to change the length of the frequency muffler duct. The outer contour of the rotating muffler portion 430 is the same as the inner contour of the fixed muffler portion 250.

[0060] It should also be noted that the silencer mounting member 410 may be provided on the rotation transition portion 420 , and the silencer mounting member 410 may be fixedly connected to the rotation transition portion 420 or detachably connected thereto.

[0061] In some embodiments, as Figure 4 As shown, the rotating muffler pipe 4040 is disposed in the housing 2020 , and the rotating muffler pipe 40 includes a supporting portion 440 , two rotating transition portions 420 and two rotating muffler portions 430 ;

[0062] The support portion 440 extends in the radial direction of the housing 20 , one end of the support portion 440 communicates with one of the two rotation transition portions 420 , and the other end of the support portion 440 communicates with the other of the two rotation transition portions 420 ;

[0063] The rotation transition portion 420 extends along the circumferential direction of the housing 20 and is coaxially arranged with the housing 20. The two rotation transition portions 420 correspond to the two rotation muffler portions 430 one by one. The end of the rotation transition portion 420 that is not connected to the support portion 440 is connected to the corresponding rotation muffler portion 430.

[0064] The two rotating sound-absorbing parts 430 correspond to the two fixed sound-absorbing parts 250 one by one, and the rotating sound-absorbing parts 430 are rotatably connected to the corresponding fixed sound-absorbing parts 250 .

[0065] It should be noted that the rotating transition portion 420 and the rotating silencer portion 430 are both hollow structures. The rotating transition portion 420 is arc-shaped to increase the length of the rotating silencer pipe 40. The rotating silencer pipe 40 is connected to the driving component 10 through the support portion 440. The longitudinal axis of the support portion 440 coincides with the axis of the fixed silencer pipe and the shell. When the driving component 10 drives the rotating silencer pipe 40 to rotate, the rotating silencer portion 430 rotates relative to the fixed silencer portion 250, that is, rotates in or out of the fixed silencer portion 250 to change the length of the frequency silencer pipe.

[0066] It should also be noted that the silencer mounting member 410 may be provided on the support portion 440 , and the silencer mounting member 410 may be fixedly connected to the support portion 440 or detachably connected thereto.

[0067] It should also be noted that if Figure 5 As shown, the noise air enters from one of the two rotating silencer parts 430 and flows to its corresponding rotating transition part 420, then flows into the support part 440, then flows into the other rotating transition part 420 of the two rotating transition parts 420, and then flows into the other rotating silencer part 430 of the two rotating silencer parts 430.

[0068] In some embodiments, the sum of the arc of the rotating muffler portion 430 and the arc of the corresponding fixed muffler portion 250 is not less than π.

[0069] It should be noted that the radian of the rotating silencer portion 430 and the radian of the fixed silencer portion 250 are both less than π. If the radian of the rotating silencer portion 430 and the radian of the fixed silencer portion 250 are not less than π, then the length of the frequency adjustment pipe cannot be adjusted; at the same time, considering that the rotating silencer portion 430 will not move out of the fixed silencer portion 250 when the rotating silencer pipe 40 is rotated, the sum of the radian of the rotating silencer portion 430 and the corresponding radian of the fixed silencer portion 250 must be no less than π.

[0070] In some embodiments, the silencer joint includes a silencer mounting member 410 and a drive assembly 10, the silencer mounting member 410 is arranged on the rotating silencer pipe 40; the drive assembly 10 is arranged on the shell 20, and the drive assembly 10 is connected to the silencer mounting member 410 to drive the rotating silencer pipe 40 to rotate.

[0071] It should be noted that the driving assembly 10 is arranged above the shell 20 and penetrates into the shell 20 to be connected to the rotating silencer duct 40.

[0072] In some embodiments, the driving assembly 10 includes a driving member 110 and a driving mounting member 120 , and the driving member 110 is mounted on the housing 20 via the driving mounting member 120 .

[0073] It should be noted that the driving member 110 is usually a driving motor, which can be installed on the cover plate 210 of the shell through the driving mounting member 120, wherein the cover plate 210 is provided with a through hole for the output shaft of the driving motor to pass through, so that the driving motor can be connected to the rotating silencer duct 40.

[0074] During operation, the noisy air entering the air intake duct 30 from the outside is diverted to the fixed muffler part 250 and the rotating muffler part 430 through the muffler inlet 310. The rotating muffler part 430 can be rotated according to the frequency of the noise to change the length of the frequency muffler pipe, so that the difference between the length of the frequency muffler pipe and the length of the air intake duct 30 reaches an odd multiple of half the wavelength of the noise frequency, so that the noisy air diverted to the frequency muffler pipe interferes with the noisy air in the air intake duct 30 when it meets the muffler outlet, thereby eliminating or reducing the noise passing through the muffler joint.

[0075] At least one embodiment of the present application further provides an air conditioner, comprising the muffler joint of any embodiment of the present application, thereby having all the technical effects brought about by the technical solutions of the above embodiments.

[0076] like Figure 6 As shown, at least one embodiment of the present application further provides a noise cancellation method, comprising:

[0077] S100 : Acquire the wavelength λ corresponding to the noise in the intake duct 30 .

[0078] In some embodiments, obtaining the wavelength λ corresponding to the noise in the intake duct 30 includes:

[0079] Get the speed of the air conditioner fan and the number of blades of the air conditioner fan;

[0080] Calculating the noise frequency of the air conditioning fan based on the rotational speed and the number of blades;

[0081] The wavelength λ is calculated based on the noise frequency.

[0082] It should be noted that the speed of the air conditioner fan (r) can be obtained through a speed sensor, or the fan speed of the air conditioner in different working modes can be pre-set, and the number of fan blades (n) can be set in advance according to actual conditions.

[0083] It should also be noted that the noise frequency of the air conditioner fan is usually calculated using the formula f=r*n / t, where r is the rotation speed, n is the number of blades, and t is the period.

[0084] It should also be noted that the wavelength is usually calculated using the formula λ=c / f, where c is the speed of sound and f is the noise frequency.

[0085] S200: Adjust the rotating muffler pipe 40 to rotate relative to the fixed muffler pipe so that the length difference L between the air intake pipe 30 and the frequency muffler pipe and the wavelength λ satisfy L=Kλ / 2, where K is an odd number.

[0086] In some embodiments, the rotating muffler pipe 40 is adjusted to rotate relative to the fixed muffler pipe so that the length difference L between the air intake pipe 30 and the frequency muffler pipe and the wavelength λ satisfy L=Kλ / 2, where K is an odd number, including:

[0087] Calculate the length difference L between the air intake duct and the frequency muffler duct based on the noise frequency;

[0088] The target rotation angle of the rotating silencer pipe 40 is calculated based on the length difference L, and the rotating silencer pipe 40 is driven by the driving component 10 to rotate to the target rotation angle to reach the length difference L to eliminate or reduce the noise passing through the silencer joint.

[0089] It should be noted that the length difference L is the length difference between the fixed silencer pipe and the rotating silencer pipe 40 when silencing the frequency noise, and is usually calculated by the formula L=K*c / 2f, where c is the speed of sound, f is the noise frequency, and K is an odd number. For example, when K=1, L=c / 2f.

[0090] It should also be noted that the target rotation angle is usually calculated by the formula θ=(L-ΔL0) / 2R, where ΔL0 is the difference in initial length between the fixed silencer pipe and the rotating silencer pipe 40, and R is the radius of the rotating silencer pipe 40. ΔL0 can be determined when the silencer joint is installed. ΔL0 can be 0 or other values. For example, when ΔL0 is 0, θ=L / 2R.

[0091] like Figure 7 As shown in the figure, it is the noise reduction amount corresponding to the noise reduction joint at different target rotation angles. Figure 7The horizontal axis is the noise frequency, and the vertical axis is the sound attenuation.

[0092] Curve 1 shows the change of noise level at the outlet of the air intake pipe when the frequency silencer pipe is not set. Figure 7 It can be seen that the noise at each frequency has not been reduced;

[0093] Curve 2 shows the noise reduction of each frequency when a frequency noise reduction pipe is provided and the target rotation angle is 0°. At this time, the noise reduction of the noise reduction joint for noises around 3400 Hz and 3700 Hz can reach 30 dB, and the noise reduction for noises around 4500 Hz can reach 46 dB.

[0094] Curve 3 shows the noise reduction of various frequencies when a frequency silencer pipe is provided and the target rotation angle is 30°. At this time, the silencer joint can reduce the noise of about 2800 Hz and 3800 Hz by 35 dB, and the noise of about 3600 Hz by 60 dB.

[0095] Curve 4 shows the noise reduction of various frequencies when a frequency silencer pipe is provided and the target rotation angle is 59°. At this time, the silencer joint can reduce the noise of about 1200 Hz by 47 dB and the noise of about 1400 Hz by 54 dB.

[0096] It should also be noted that an angle sensor may be provided in the driving member 110 to obtain the current angle of the rotating muffler duct 40 so as to make adjustments according to the current angle.

[0097] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A muffler joint, characterized in that: include: Intake duct; A frequency muffler pipe, comprising a fixed muffler pipe and a rotating muffler pipe that are rotatably connected, wherein the fixed muffler pipe is connected to the air intake pipe; The rotating muffler pipe can be rotated relative to the fixed muffler pipe to change the length of the frequency muffler pipe, so that the length difference L between the intake pipe and the frequency muffler pipe and the wavelength corresponding to the noise in the intake pipe are Satisfy L=K / 2, K is an odd number; The muffler joint includes a shell and two partitions; the two partitions respectively form a fixed muffler portion with the shell, and the two fixed mufflers together form the fixed muffler duct, wherein the fixed muffler portion extends along the circumferential direction of the shell and the two fixed mufflers are arranged in a centrally symmetrical manner; The rotating silencer pipe is arranged in the shell, and the rotating silencer pipe includes a rotating transition part and two rotating silencer parts; the two ends of the rotating transition part are respectively connected to the two rotating silencer parts, and the rotating transition part extends along the radial direction of the shell; the two rotating silencer parts correspond to the two fixed silencer parts one by one, and the rotating silencer part is rotatably connected to the corresponding fixed silencer part, or, The rotating silencer pipe is arranged in the shell, and the rotating silencer pipe includes a support part, two rotating transition parts and two rotating silencer parts; the support part extends along the radial direction of the shell, one end of the support part is connected with one of the two rotating transition parts, and the other end of the support part is connected with the other rotating transition part of the two rotating transition parts; the rotating transition part extends along the circumferential direction of the shell and is coaxially arranged with the shell, the two rotating transition parts correspond one-to-one with the two rotating silencer parts, and the end of the rotating transition part that is not connected with the support part is connected with the corresponding rotating silencer part; the two rotating silencer parts correspond one-to-one with the two fixed silencer parts, and the rotating silencer part is rotatably connected with the corresponding fixed silencer part.

2. The muffler joint according to claim 1, characterized in that: The air intake duct is arranged in the shell, and the air intake duct has a silencer inlet and a silencer outlet. One of the two fixed silencers is connected to the silencer inlet, and the other of the two fixed silencers is connected to the silencer outlet.

3. The muffler joint according to claim 2, characterized in that: The sum of the radian of the rotating muffler portion and the radian of the corresponding fixed muffler portion is not less than π.

4. The muffler joint according to claim 2, characterized in that: The muffler joint comprises: A silencer mounting member, which is arranged on the rotating silencer pipe; A driving assembly is arranged on the shell, and the driving assembly is connected to the silencer mounting member to drive the rotating silencer pipe to rotate.

5. The muffler joint according to claim 4, characterized in that: The driving assembly includes a driving member and a driving mounting member, and the driving member is mounted on the housing through the driving mounting member.

6. An air conditioner, characterized in that: The utility model comprises a sound-absorbing joint as described in any one of claims 1 to 5.

7. A noise silencing method for a silencer joint according to claim 1, characterized in that: include: Get the wavelength corresponding to the noise in the intake duct ; Adjust the rotating silencer pipe so that the rotating silencer pipe rotates relative to the fixed silencer pipe so that the length difference L between the air inlet pipe and the frequency silencer pipe and the wavelength Satisfying L=K / 2, K is an odd number.

8. The noise elimination method according to claim 7, characterized in that: The wavelength corresponding to the noise in the air intake duct is obtained ,include: Get the speed of the air conditioner fan and the number of blades of the air conditioner fan; Calculating the noise frequency of the air conditioning fan based on the rotational speed and the number of blades; The wavelength is calculated based on the noise frequency .

9. The noise elimination method according to claim 7, characterized in that: The rotating muffler pipe is adjusted to rotate relative to the fixed muffler pipe so that the length difference L between the air inlet pipe and the frequency muffler pipe and the wavelength Satisfying L=K / 2, K is an odd number, including: Calculate the length difference L between the air intake duct and the frequency muffler duct based on the noise frequency; The target rotation angle of the rotating silencer pipe is calculated based on the length difference L, and the rotating silencer pipe is driven to rotate to the target rotation angle by a driving component to achieve the length difference L to eliminate or reduce the noise passing through the silencer joint.

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