CN109026602B

CN109026602B - Device for relieving exhaust pressure pulsation and air conditioner using same

Info

Publication number: CN109026602B
Application number: CN201810790623.1A
Authority: CN
Inventors: 夏增强; 高旭; 吴俊鸿; 王现林; 高智强; 程诗
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2018-07-18
Filing date: 2018-07-18
Publication date: 2023-06-13
Anticipated expiration: 2038-07-18
Also published as: CN109026602A

Abstract

The invention relates to an exhaust pressure pulsation relieving device and an air conditioner applying the same, which relate to the field of air conditioners and mainly aim to solve the problems that in the prior art, the noise elimination frequency of a silencer is poor in adaptability and the requirements of various frequency points and various working conditions of operation of a compressor cannot be met. The technical scheme mainly adopted is as follows: an exhaust pressure pulsation relief device comprising a housing having an acoustic chamber, a pressure pulsation dampening device having a first passage and a second passage, and a regulating device, the inlets of both the first passage and the second passage being in communication with the acoustic chamber; a length difference delta L is arranged between the first channel and the second channel, so that a phase difference exists between waveforms of airflows at outlets of the first channel and the second channel; the adjusting device is used for adjusting the volume of the silencing cavity and/or the length of the first channel and/or the length of the second channel according to the air inlet pressure of the exhaust pressure pulsation relieving device.

Description

Device for relieving exhaust pressure pulsation and air conditioner using same

Technical Field

The invention relates to the technical field of air conditioners, in particular to a device for relieving exhaust pressure pulsation and an air conditioner using the same.

Background

The pressure pulsations are caused by the compressor's periodic discharge. The exhaust pressure pulsation usually brings about the problems of pipeline stress reliability and sound transmission, and the common solution is to design an exhaust silencer for relieving the pressure pulsation (the release principle is realized through volume change, the larger the volume is, the more obvious the effect of relieving the pressure pulsation), and the effect of reducing the noise is realized by attenuating the pressure pulsation through the phase difference of pressure pulsation signals.

The muffler (shown in fig. 1) used in the prior art of air conditioner has a fixed length of the muffling cavity, so that the muffling frequency and the muffling amount are both fixed, and cannot meet the requirements of different frequencies and different system sizes. As shown in fig. 2, since the lengths of the

channels

10 and 20 are constant in the drawings, the pulsation signals of a specific frequency can be eliminated, and the variation requirements of different frequencies cannot be satisfied.

Disclosure of Invention

In view of this, the present invention provides a device for relieving exhaust pressure pulsation and an air conditioner using the same, which mainly aims to solve the problems that in the prior art, the muffler has poor noise elimination frequency adaptability, and the requirements of various frequency points and various working conditions of the compressor can not be met.

In order to achieve the above purpose, the present invention mainly provides the following technical solutions:

in one aspect, embodiments of the present invention provide an exhaust pressure pulsation relief device comprising a housing having an acoustic cavity and a pressure pulsation relief device having a first passage and a second passage, both of which have inlets in communication with the acoustic cavity; a length difference delta L is arranged between the first channel and the second channel, so that a phase difference exists between waveforms of airflows at outlets of the first channel and the second channel; the exhaust pressure pulsation reducing device further comprises an adjusting device;

the adjusting device is used for adjusting the volume of the silencing cavity and/or the length of the first channel and/or the length of the second channel according to the air inlet pressure of the exhaust pressure pulsation relieving device.

The aim and the technical problems of the invention can be further realized by adopting the following technical measures.

In the foregoing exhaust pressure pulsation reducing device, optionally, the adjusting device adjusts the length of the muffling chamber in the housing, so that the volume of the muffling chamber is adjustable.

In the foregoing exhaust pressure pulsation reducing device, optionally, the adjusting device includes a first baffle plate and an elastic member;

the first baffle is arranged in the shell and forms a part of a cavity wall of the sound-eliminating cavity; the first baffle can move along the length direction of the shell so as to enable the volume of the silencing cavity to be adjustable;

the elastic piece is used for being matched with the first baffle plate so as to adjust the position of the first baffle plate in the length direction of the shell according to the air inlet pressure of the exhaust pressure pulsation relieving device.

In the foregoing exhaust pressure pulsation reducing device, optionally, the adjusting device further includes a second baffle plate disposed in the housing and located on a side of the first baffle plate facing away from the sound-reducing chamber;

the elastic piece is arranged in the shell and is positioned between the first baffle plate and the second baffle plate;

the second baffle is a fixed plate to provide support for the elastic member when the elastic member is compressed.

In the foregoing exhaust pressure pulsation reducing device, optionally, at least one of the first passage and the second passage is a bellows;

the telescopic pipes in the first channel and the second channel are matched with the first baffle plate so as to be driven by the first baffle plate to stretch and retract, and the length of the corresponding channel is adjustable.

In the foregoing exhaust pressure pulsation relief device, optionally, when the adjusting device includes a second baffle, the telescopic tube in both the first channel and the second channel has a movable section and a fixed section, the movable section is disposed on the first baffle, and the fixed section is disposed on the second baffle, so that the movable section can be extended and contracted relative to the fixed section under the driving of the first baffle.

In the foregoing exhaust pressure pulsation relief device, optionally, the first channel is a telescopic tube and is in a straight line;

the first channel is provided with a first pipe section and a second pipe section, the first pipe section is a movable section, and the second pipe section is a fixed section;

the first channel is communicated with the silencing cavity through one end of the first pipe section, and the other end of the first pipe section is connected with one end of the second pipe section in an inserting mode.

In the foregoing exhaust pressure pulsation reducing device, optionally, the second channel is a telescopic tube and is S-shaped;

the second channel has a third pipe section, a fourth pipe section, a fifth pipe section, and a sixth pipe section;

the third pipe section is a movable section and is in a straight line shape, the fourth pipe section is a fixed section and is in a U shape, the fifth pipe section is a movable section and is in a U shape, and the sixth pipe section is a fixed section and is in a straight line shape;

the second channel is communicated with the silencing cavity through one end of the third pipe section, the other end of the third pipe section is connected with one end of the fourth pipe section in an inserting mode, the other end of the fourth pipe section is connected with one end of the fifth pipe section in an inserting mode, and the other end of the fifth pipe section is connected with one end of the sixth pipe section in an inserting mode.

In the foregoing exhaust pressure pulsation reducing device, optionally, the length difference Δl is such that there is a 180 ° phase difference between the waveforms of the air flow at the first passage outlet and the air flow at the second passage outlet.

In another aspect, an embodiment of the present invention further provides an air conditioner, including a compressor and any one of the above-described exhaust pressure pulsation reducing devices;

and the exhaust port of the compressor is connected with the air inlet of the exhaust pressure pulsation relieving device.

By means of the technical scheme, the exhaust pressure pulsation relieving device and the air conditioner applying the same have the following beneficial effects:

in the technical scheme provided by the invention, the volume of the silencing cavity and/or the length of the first channel and/or the length of the second channel can be adaptively adjusted according to the air inlet pressure of the exhaust pressure pulsation relieving device, so that the exhaust pressure pulsation relieving device can adapt to the requirements of different frequencies and different system sizes, adapt to various frequency points and various working conditions of the operation of a compressor, and improve the application range of the exhaust pressure pulsation relieving device.

The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a muffler of the prior art;

FIG. 2 is a schematic view of another muffler according to the prior art;

FIG. 3 is a schematic diagram of an exhaust pressure pulsation reducing device according to an embodiment of the present invention;

FIG. 4 is a schematic view of the cross-sectional structure in the direction A in FIG. 3;

FIG. 5 is an enlarged schematic view of the structure at B in FIG. 4;

FIG. 6 is a schematic diagram showing an assembly structure of an adjusting device and a first channel and a second channel according to an embodiment of the present invention;

FIG. 7 is a schematic view of the cross-sectional structure in the direction C in FIG. 6;

FIG. 8 is a schematic cross-sectional view of a first channel according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a second channel according to an embodiment of the present invention.

Reference numerals: 1. a housing; 11. an acoustic cavity; 12. a pulsation signal cancellation chamber; 2. a pressure pulsation damping device; 21. a first channel; 211. a first pipe section; 212. a second pipe section; 22. A second channel; 221. a third pipe section; 222. a fourth pipe section; 223. a fifth pipe section; 224. a sixth pipe section; 3. an adjusting device; 31. a first baffle; 32. an elastic member; 33. a second baffle; 100. an exhaust pressure pulsation device is relieved; 101. the intake port of the exhaust pressure pulsation device is relieved.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

As shown in fig. 3 to 5, an exhaust pressure pulsation reducing device 100 according to an embodiment of the present invention includes a housing 1, a pressure pulsation reducing device 2, and an adjusting device 3. The housing 1 has an acoustic damping chamber 11. The pressure pulsation damping device 2 has a first passage 21 and a second passage 22. The inlets of both the first passage 21 and the second passage 22 are in communication with the sound-deadening chamber 11. There is a length difference DeltaL between the first channel 21 and the second channel 22. The length difference DeltaL causes a phase difference between the waveforms of the air flow at the outlet of the first passage 21 and the air flow at the outlet of the second passage 22 to attenuate the amplitude of the waveform of the air flow after the two are merged. The adjusting means 3 serve according to the invention to relieve the intake pressure of the exhaust pressure pulsation device 100 from adjusting the volume of the sound-damping chamber 11 and/or the length of the first channel 21 and/or the length of the second channel 22.

Specifically, in the implementation, the gas discharged from the compressor enters the silencing cavity 11 from the gas inlet 101 of the device 100 for relieving the discharge pressure pulsation of the present invention, and then flows into the first channel 21 and the second channel 22 through the silencing cavity 11, and the amplitude of the waveform is attenuated after the gas flow at the outlet of the first channel 21 and the gas flow at the outlet of the second channel 22 are converged, so as to achieve the effect of relieving the discharge pressure pulsation.

In the above-provided technical solution, since the volume of the sound-absorbing cavity 11 and/or the length of the first channel 21 and/or the length of the second channel 22 can be adaptively adjusted according to the intake pressure of the exhaust pressure pulsation device 100, the exhaust pressure pulsation device 100 can adapt to the requirements of different frequencies and different system sizes, so as to adapt to various frequency points and various working conditions of the operation of the compressor, and the application range of the exhaust pressure pulsation device 100 is improved.

In one example, the adjusting device 3 may adjust the volume of the sound-damping chamber 11 by adjusting the length of the sound-damping chamber 11 in the housing 1. Of course, the volume of the sound-absorbing chamber 11 can be adjusted by the inner diameter thereof.

In an example in which the adjusting means 3 adjusts the length of the sound-deadening chamber 11, as shown in fig. 5 to 7, the adjusting means 3 may include a first baffle 31 and an elastic member 32. The first baffle 31 is provided in the housing 1 and constitutes a part of the cavity wall of the sound-deadening cavity 11. The first baffle 31 is movable along the length of the housing 1 to allow the volume of the sound damping chamber 11 to be adjustable. The elastic member 32 is adapted to cooperate with the first barrier 31 to adjust the position of the first barrier 31 in the longitudinal direction of the housing 1 in accordance with the intake pressure of the exhaust pressure pulsation reducing device 100. Specifically, when the intake pressure of the exhaust pressure pulsation reducing device 100, that is, the exhaust pressure of the compressor is increased, the pressure inside the sound-deadening chamber 11 is increased, so that the first baffle plate 31 can be pushed to move, the volume of the sound-deadening chamber 11 is increased, and the effect of reducing the pressure pulsation of the sound-deadening chamber 11 can be improved. On the contrary, when the intake pressure of the exhaust pressure pulsation device 100, i.e. the exhaust pressure of the compressor is reduced, the pressure inside the sound damping chamber 11 is reduced, the elastic member 32 pushes the first baffle 31 to move, so that the volume of the sound damping chamber 11 is reduced to adapt to the requirement of slightly lower frequency pressure pulsation.

The elastic member 32 may be a spring, a flexible rubber, or the like.

Further, as shown in fig. 5 to 7, the aforementioned adjusting device 3 may further include a second baffle 33. The second baffle 33 is arranged in the housing 1 on the side of the first baffle 31 facing away from the sound-damping chamber 11. The elastic member 32 is disposed in the housing 1 and located between the first baffle 31 and the second baffle 33. The second baffle 33 is a fixed plate to provide support to the elastic member 32 when the elastic member 32 is pressed.

Further, in order to enable the adjusting device 3 to adjust the length of the first passage 21 and/or the length of the second passage 22 in accordance with the intake pressure of the exhaust pressure pulsation device 100, as shown in fig. 5 to 7, at least one of the first passage 21 and the second passage 22 is a bellows. The telescopic tubes in both the first channel 21 and the second channel 22 are matched with the first baffle 31 to be telescopic under the drive of the first baffle 31, so that the lengths of the corresponding channels can be adjusted. For example, when the first channel 21 is a telescopic tube, the length of the first channel 21 is adjustable, when the second channel 22 is a telescopic tube, the length of the second channel 22 is adjustable, or when both the first channel 21 and the second channel 22 are telescopic tubes, the lengths of both the first channel 21 and the second channel 22 are adjustable, so that the exhaust pressure pulsation relieving device 100 of the present invention can further adapt to the requirements of different frequencies and different system sizes, so as to further adapt to each frequency point and each working condition of the operation of the compressor, and further improve the application range of the exhaust pressure pulsation relieving device 100 of the present invention.

Further, as shown in fig. 5 to 7, when the adjusting device 3 includes the second shutter 33, the telescopic tube in both the first passage 21 and the second passage 22 described above has a movable section and a fixed section. The movable section is arranged on the first baffle 31, the fixed section is arranged on the second baffle 33, and the second baffle 33 is a fixed plate, so that the movable section can stretch and retract relative to the fixed section under the drive of the first baffle 31, and the length of the corresponding channel can be adjusted.

In a specific application example, as shown in fig. 8, the first channel 21 is a telescopic tube and is linear. The first channel 21 has a first tube section 211 and a second tube section 212. The first tube section 211 is a movable section and the second tube section 212 is a fixed section. The first passage 21 communicates with the sound damping chamber 11 through one end of the first pipe section 211. The other end of the first pipe section 211 is connected to one end of the second pipe section 212 by plugging, for example, the other end of the first pipe section 211 is inserted into one end of the second pipe section 212, or the one end of the second pipe section 212 is inserted into the other end of the first pipe section 211. When the first pipe section 211 moves under the driving of the first baffle 31, the first pipe section 211 stretches and contracts relative to the second pipe section 212, so that the length of the first channel 21 is adjustable.

In one example, as shown in fig. 9, the second channel 22 is a bellows and has an S-shape. The second channel 22 has a third pipe segment 221, a fourth pipe segment 222, a fifth pipe segment 223, and a sixth pipe segment 224. The third pipe section 221 is a movable section and is linear. The fourth pipe section 222 is a fixed section and has a U-shape. The fifth pipe section 223 is a movable section and has a U-shape. The sixth pipe segment 224 is a fixed segment and is linear. The second passage 22 communicates with the sound damping chamber 11 through one end of the third pipe section 221. The other end of the third pipe section 221 is connected to one end of the fourth pipe section 222 by plugging, for example, the other end of the third pipe section 221 may be inserted into one end of the fourth pipe section 222, or one end of the fourth pipe section 222 may be inserted into the other end of the third pipe section 221. The other end of the fourth pipe section 222 is connected to one end of the fifth pipe section 223 by plugging, for example, the other end of the fourth pipe section 222 is inserted into one end of the fifth pipe section 223, or one end of the fifth pipe section 223 is inserted into the other end of the fourth pipe section 222. The other end of the fifth pipe section 223 is connected to one end of the sixth pipe section 224 by plugging, for example, the other end of the fifth pipe section 223 is inserted into one end of the sixth pipe section 224, or one end of the sixth pipe section 224 is inserted into the other end of the fifth pipe section 223. When the first baffle 31 moves, the first baffle 31 moves the third pipe section 221 and the fifth pipe section 223, thereby making the length of the second passage 22 adjustable.

Further, the difference in length Δl between the first passage 21 and the second passage 22 causes a 180 ° phase difference between the waveforms of the air flow at the outlet of the first passage 21 and the air flow at the outlet of the second passage 22.

By the above arrangement, the length difference Δl ensures that there is a time difference between the time when the air flows through the first channel 21 and the time when the air flows through the second channel 22, the time difference is preferably 0.5×n×t (T is one air flow period, N is a natural number), so that the time difference can make the air flows flowing through the first channel 21 and the second channel 22 have a 180 ° phase difference, so that the peaks and the troughs of the two air flows coincide, and the effects of mutual cancellation and energy attenuation are optimal, thereby achieving the purpose of self-reducing the air flow pulsation by using the phase difference.

Embodiments of the present invention also provide an air conditioner including a compressor and the discharge pressure pulsation reducing device 100 in any of the above examples. The exhaust port of the compressor is connected to the intake port 101 of the device for relieving exhaust pressure pulsation 100.

In the above embodiments, the air conditioner provided by the present invention is provided with the device for relieving exhaust pressure pulsation 100, so that the impact of air flow on the system pipeline and the vibration and noise of the system can be effectively reduced.

The working principle and preferred embodiments of the present invention are described below.

The invention solves the following technical problems: 1. the problem of the transmission sound and the pipeline stress that cause by air conditioner pressure pulsation among the prior art is solved. 2. The problems that the noise elimination frequency of the silencer in the prior art is poor in adaptability and cannot meet the requirements of various frequency points and various working conditions of the operation of the compressor are solved.

The exhaust pressure pulsation relieving device 100 of the invention realizes the adjustment of the length of the silencing cavity 11 and the silencing channel by utilizing the pressure change of the system, solves the problem of compressor exhaust pulsation, and can realize the alleviation and elimination of the pulsation of the pressure in the system.

According to the technical scheme, exhaust pressure pulsation is relieved by utilizing the volume change of the sound-absorbing cavity 11 and 180 degrees of the pulsation signal phase difference, so that two effects of relieving the pressure pulsation of the same device are achieved.

According to the technical scheme of the invention, the length of the silencing cavity 11 is adjustable, the lengths of the first channel 21 and the second channel 22 which generate 180 degrees of phase difference are also adjustable, and the two adjusting modes are self-adaptively adjusted according to the exhaust pressure, so that the silencing device has higher reliability. In the technical scheme of the invention, the length of the sound-eliminating cavity 11 and the lengths of the first channel 21 and the second channel 22 are simultaneously adjustable through the design of the adjusting device 3. The first channel 21 is a straight channel and the second channel 22 is designed as an S-row channel.

1. Overall device profile.

As shown in fig. 3 to 5, the exhaust pressure pulsation reducing device 100 of the present invention mainly includes a housing 1, a first passage 21, a second passage 22, and a regulating device 3. The regulating device 3 divides the interior of the housing 1 into a pressure pulsation relief chamber, namely the aforementioned sound damping chamber 11, and two rows of pulsation signal cancellation chambers 12, which are 180 ° out of phase. The adjusting device 3 includes: a first baffle 31, a second baffle 33 and an elastic member 32. The elastic member 32 may be a spring structure or the like. The first shutter 31 is movable in the longitudinal direction of the inner wall of the casing 1 by the pressure of the refrigerant. The second shutter 33 is a fixed plate and cannot move. The length of both the first channel 21 and the second channel 22 can be adjusted.

The device of the invention relieves pressure pulsations mainly by adjusting the size of the dampening chamber 11 and the length of the first 21 and second 22 channels as shown in fig. 4.

Size adjustment of the pressure pulsation reducing chamber, i.e. the aforementioned sound reducing chamber 11: the size of the pressure pulsation reducing chamber can be adjusted as shown in fig. 4, the adjustment being mainly achieved by the left-right movement of the first shutter 31 of the adjusting device 3. The first shutter 31 is movable in the longitudinal direction of the inner wall of the casing 1 by the pressure of the refrigerant. When the refrigerant discharge pressure increases, the first shutter 31 moves to the right by an increased distance, and the larger the volume of the pressure pulsation reducing chamber, that is, the sound reducing chamber 11, the more remarkable the pressure pulsation reducing effect (the larger the volume, the better the pressure pulsation reducing effect).

The first and

second passages

21 and 22 alleviate the pressure pulsation principle: the refrigerant in the sound-deadening chamber 11 flows from the left side of the first baffle 31 to the right side through the first passage 21 and the second passage 22, and changes the pressure pulsation and the noise signal phase through the first passage 21 and the second passage 22 according to the difference in length between the first passage 21 and the second passage 22. When the first baffle 31 is subjected to pressure movement, the lengths of the first channel 21 and the second channel 22 are changed, the length difference is delta L, and the signals delayed by 0.5 xNxT (T is an airflow period and N is a natural number) through the second channel 22 are offset by 180 degrees from the phase difference of the signals passing through the first channel 21, so that the purpose of relieving pressure pulsation is achieved.

2. And (5) designing key parts.

1) The design of the first channel 21.

As shown in fig. 8, the first channel 21 includes two parts, namely, a first pipe segment 211, which is the left part of the channel 1, and a second pipe segment 212, which is the right part of the channel 1, and one end of the second pipe segment 212 is inserted into one end of the first pipe segment 211, so that the length of the first channel 21 can be adjusted.

2) The design of the second channel 22.

As shown in fig. 9, the second channel 22 is of an S-shaped design, clearly distinguished from the length of the first channel 21. The second channel 22 mainly comprises four parts of a channel 2_left third pipe segment 221, a channel 2_U pipe 1 fourth pipe segment 222, a channel 2_U pipe 2 fifth pipe segment 223 and a channel 2_right sixth pipe segment 224, and the length of the second channel 22 can also be adjusted.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. An exhaust pressure pulsation relief device comprising a housing (1) having a sound damping chamber (11), and a pressure pulsation relief device (2) having a first channel (21) and a second channel (22), the inlets of both the first channel (21) and the second channel (22) being in communication with the sound damping chamber (11); a length difference delta L is arranged between the first channel (21) and the second channel (22), so that a phase difference exists between waveforms of airflows at outlets of the first channel and the second channel; characterized in that the exhaust pressure pulsation reducing device further comprises an adjusting device (3);

the adjusting device (3) is used for adjusting the volume of the silencing cavity (11) and/or the length of the first channel (21) and/or the length of the second channel (22) according to the air inlet pressure of the exhaust pressure pulsation relieving device;

the adjusting device (3) comprises a first baffle (31) and an elastic piece (32);

the first baffle (31) is arranged in the shell (1) and forms a part of the cavity wall of the silencing cavity (11); the first baffle plate (31) can move along the length direction of the shell (1) so as to enable the volume of the silencing cavity (11) to be adjustable;

the elastic piece (32) is used for being matched with the first baffle plate (31) so as to adjust the position of the first baffle plate (31) in the length direction of the shell (1) according to the air inlet pressure of the exhaust pressure pulsation relieving device; at least one of the first channel (21) and the second channel (22) is a telescopic tube; the telescopic pipes in the first channel (21) and the second channel (22) are matched with the first baffle (31) so as to be driven by the first baffle (31) to stretch and retract, and the length of the corresponding channel is adjustable.

2. The exhaust pressure pulsation reducing device according to claim 1, wherein,

the adjusting device (3) enables the volume of the silencing cavity (11) to be adjustable by adjusting the length of the silencing cavity (11) in the shell (1).

3. The exhaust pressure pulsation reducing device according to claim 1, wherein,

the adjusting device (3) further comprises a second baffle plate (33), wherein the second baffle plate (33) is arranged in the shell (1) and is positioned at one side of the first baffle plate (31) away from the silencing cavity (11);

the elastic piece (32) is arranged in the shell (1) and is positioned between the first baffle (31) and the second baffle (33);

the second baffle (33) is a fixed plate to provide support for the elastic member (32) when the elastic member (32) is compressed.

4. The exhaust pressure pulsation reducing device according to claim 3, wherein,

the telescopic pipe in the first channel (21) and the second channel (22) is provided with a movable section and a fixed section, the movable section is arranged on the first baffle (31), and the fixed section is arranged on the second baffle (33), so that the movable section can be driven by the first baffle (31) to stretch and retract relative to the fixed section.

5. The exhaust pressure pulsation reducing device according to claim 4, wherein,

the first channel (21) is a telescopic pipe and is in a straight line;

the first channel (21) is provided with a first pipe section (211) and a second pipe section (212), the first pipe section (211) is a movable section, and the second pipe section (212) is a fixed section;

the first channel (21) is communicated with the silencing cavity (11) through one end of the first pipe section (211), and the other end of the first pipe section (211) is connected with one end of the second pipe section (212) in an inserting mode.

6. The exhaust pressure pulsation reducing device according to claim 4 or 5, characterized in that,

the second channel (22) is a telescopic pipe and is S-shaped;

the second channel (22) has a third tube section (221), a fourth tube section (222), a fifth tube section (223) and a sixth tube section (224);

the third pipe section (221) is a movable section and is in a straight line shape, the fourth pipe section (222) is a fixed section and is in a U shape, the fifth pipe section (223) is a movable section and is in a U shape, and the sixth pipe section (224) is a fixed section and is in a straight line shape;

the second channel (22) is communicated with the silencing cavity (11) through one end of the third pipe section (221), the other end of the third pipe section (221) is connected with one end of the fourth pipe section (222) in a plugging mode, the other end of the fourth pipe section (222) is connected with one end of the fifth pipe section (223) in a plugging mode, and the other end of the fifth pipe section (223) is connected with one end of the sixth pipe section (224) in a plugging mode.

7. The exhaust pressure pulsation reducing device according to any one of claims 1 to 5,

the length difference DeltaL is such that there is a 180 DEG phase difference between the waveform of the air flow at the outlet of the first channel (21) and the waveform of the air flow at the outlet of the second channel (22).

8. An air conditioner comprising a compressor and the exhaust pressure pulsation reducing device according to any one of claims 1 to 7;