Silencer and air conditioner

Abstract

The application relates to the technical field of air conditioners, and discloses a silencer. The silencer provided by the application comprises a silencer body, a silencing piece and a partition plate. The silencer body is provided with a silencing chamber; the silencing piece comprises a first pipe and a second pipe, and the first pipe and the second pipe are connected at two ends of the silencer body; the partition plate is provided with a through hole, the partition plate divides the silencing chamber into two or more silencing cavities, at least one of the silencing cavities comprises a folding part, and the folding part has N foldable and stretchable folding cavities. The partition plate divides the silencer into multiple silencing cavities, and the volume of the silencing cavities can be adjusted, so that noise in different frequency bands can be eliminated, and the problem that the application range of the air conditioner silencer is narrow is solved. The application further discloses an air conditioner.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, such as a muffler and an air conditioner. Background Technology

[0002] Air conditioner compressors undergo vigorous operation, generating sharp, unusual noises at certain frequencies. Therefore, silencers are added during air conditioner design to eliminate this noise. An air conditioner silencer is a device that uses principles of sound absorption, reflection, and interference to reduce airflow and liquid flow noise in the outdoor unit's piping. Common air conditioner silencers are cylindrical, hollow structures connected in series within the outdoor unit's piping. Silencers come in various sizes, differing mainly in length, diameter, cavity volume, and shape. Different sized silencers are suitable for reducing different types of noise and different compressor frequency ranges. Air conditioner refrigerant noise primarily includes refrigerant airflow and liquid flow noise, as well as the sounds of pipe vibration and collision. The magnitude of refrigerant noise is related to refrigerant flow rate, refrigerant velocity, pipe diameter, and pipe installation method. To reduce the aforementioned refrigerant noise, silencers connected in series with the piping are selected.

[0003] In related technologies, fixed-model silencers are often selected to effectively reduce refrigerant noise under preset operating conditions. Specifically, after developing a piping plan, noise tests are conducted on the outdoor unit of the air conditioner to obtain the peak frequency of the abnormal noise. A silencer is then selected based on this frequency, sound velocity, and piping specifications. Next, piping with a fixed length of silencer is customized, and noise tests are conducted again. For a single type of air conditioner, multiple silencers need to be tested until the silencer with the best noise reduction effect is selected.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] Variable frequency air conditioners operate under diverse conditions, and the use of fixed-model silencers in related technologies cannot meet the noise reduction requirements under all operating conditions, resulting in a narrow range of applications. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a muffler with a partition having through holes, dividing the muffler chamber into two or more muffler cavities. At least one muffler cavity includes a folded portion having N foldable and stretchable folded cavities. The partition divides the muffler into multiple muffler cavities, and the volume of each cavity is adjustable, thereby eliminating noise in different frequency bands and solving the problem of the narrow applicability of air conditioner mufflers.

[0008] In some embodiments, the muffler includes a muffler body, a muffler component, and a partition. The muffler body has a muffler chamber; the muffler component includes a first pipe and a second pipe, which are respectively connected to the two ends of the muffler body; the partition has a through hole and divides the muffler chamber into two or more muffler cavities, at least one of the muffler cavities includes a folded portion, and the folded portion has N foldable and stretchable folded cavities.

[0009] In some alternative embodiments, the anechoic chamber includes a first tube and a second tube. The first tube is cylindrical and has a hollow, through-hole structure; the second tube is integrally connected to the first tube, and the sidewalls of the second tube are W-shaped folds to form the folds, thereby adjusting the length of the second tube.

[0010] In some alternative embodiments, the folded cavity is located in the middle of the anechoic cavity.

[0011] In some optional embodiments, the silencing body further includes an expanding cavity and a contracting cavity. The large-diameter end of the expanding cavity is connected to the first port of the silencing chamber, and the small-diameter end of the expanding cavity is connected to the first piping; the large-diameter end of the contracting cavity is connected to the second port of the silencing chamber, and the small-diameter end of the contracting cavity is connected to the second piping.

[0012] In some alternative embodiments, the expanding cavity and the contracting cavity are arranged symmetrically.

[0013] In some alternative embodiments, there are multiple partitions, and the through holes of the multiple partitions are arranged in a straight line between the first pipe and the second pipe.

[0014] In some alternative embodiments, under cooling conditions, the first piping is connected to the air conditioner's compressor, and the second piping is connected to the air conditioner's condenser; under heating conditions, the first piping is connected to the air conditioner's evaporator, and the second piping is connected to the air conditioner's compressor.

[0015] In some alternative embodiments, the silencing body is made of a rigid material.

[0016] In some embodiments, the air conditioner includes a refrigerant circulation line and the aforementioned muffler. The refrigerant circulation line includes a compressor, a condenser, a throttling element, and an evaporator connected in sequence, with thermocouples arranged at the compressor's discharge port, the condenser, and the evaporator; the muffler is connected in series in the refrigerant circulation line.

[0017] In some alternative embodiments, there are two silencers connected in series on the refrigerant circulation line.

[0018] The silencer provided in this embodiment can achieve the following technical effects:

[0019] The silencer includes a silencer body, silencer components, and a partition. The silencer body contains a silencer chamber; the silencer components include a first pipe and a second pipe, respectively connected to both ends of the silencer body; the partition has through holes and divides the silencer chamber into two or more silencer cavities, at least one of which includes a folded portion with N foldable and stretchable folded cavities. The partition divides the silencer into multiple silencer cavities, and the volume of each cavity is adjustable, thereby eliminating noise in different frequency bands and solving the problem of the narrow applicability of air conditioner silencers.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0022] Figure 1 This is a schematic diagram of the overall structure of the muffler provided in the embodiments of this disclosure;

[0023] Figure 2 This is a schematic diagram of the overall structure of another muffler provided in the fully folded state according to an embodiment of this disclosure;

[0024] Figure 3 This is a schematic diagram of the overall structure of the muffler in a partially deployed state according to an embodiment of this disclosure;

[0025] Figure 4 This is a schematic diagram of the overall structure of another silencer provided in the fully deployed state according to an embodiment of this disclosure;

[0026] Figure 5 This is a partial structural schematic diagram of the refrigerant circulation system of an air conditioner provided in an embodiment of this disclosure;

[0027] Figure 6 This is a partial structural schematic diagram of the refrigerant circulation system of another air conditioner provided in an embodiment of this disclosure.

[0028] Figure label:

[0029] 1: Silencing body; 11: First pipe body; 12: Second pipe body; 13: Expanding cavity; 14: Contracting cavity; 2: First piping; 3: Second piping; 4: Partition plate; 41: Through hole; 5: Compressor; 6: Condenser; 7: Evaporator; 8: Four-way valve. Detailed Implementation

[0030] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0031] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0032] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0033] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0034] Unless otherwise stated, the term "multiple" means two or more.

[0035] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0036] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0038] The main indicators for judging the quality of a silencer design are the sound transmission loss A and the noise reduction frequency F. Under the same inlet conditions, the wider the noise frequency bandwidth that the silencer can eliminate and the greater the sound transmission loss A, the better the design.

[0039] The expansion silencer is the most commonly used structural form of reactive silencer, also known as an expansion type silencer. It is designed based on the principle that sound waves in a pipe are reflected at points of abrupt change in cross-section (expansion or contraction) to attenuate noise.

[0040] An expansion silencer consists of two basic components: a tube and a chamber. Its most basic form is the single-section expansion silencer.

[0041] The frequency at which a traditional expansion-type silencer eliminates noise is related to the effective length L of the silencer. When L is constant, the silencer can only eliminate noise at a fixed number of frequencies. F = (2n+1)*C / (4*L), where F is the maximum noise reduction frequency, L is the effective length of the silencer, and C is the velocity of sound in the fluid.

[0042] In the process of optimizing and improving the noise of a refrigeration system, in the absence of noise spectrum testing equipment, it is often necessary to replace the muffler multiple times to achieve a good optimization effect. The process of replacing the muffler requires disassembling the original muffler from the air conditioning piping system, purging the refrigerant, connecting the new muffler, evacuating the system, and recharging the refrigerant.

[0043] In air conditioning systems, there are often more than one noise frequency that needs to be eliminated. This requires multiple silencers to be connected in series during the testing process, which increases the complexity and duration of the test.

[0044] Combination Figure 1-6 As shown, this disclosure provides a muffler and an air conditioner.

[0045] The muffler provided in this embodiment includes a muffler body 1, a muffler component, and a partition 4. A muffler chamber is provided inside the muffler body 1; the muffler component includes a first pipe 2 and a second pipe 3, respectively connected to both ends of the muffler body 1; the partition 4 has a through hole 41, and the partition 4 divides the muffler chamber into two or more muffler cavities, at least one of which includes a folded portion, the folded portion having N foldable and stretchable folded cavities.

[0046] Specifically, the internal cavity of the silencer is divided into M silencing chambers by partitions 4, with at least one of the chamber lengths L1, L2...Li being variable. Using the chamber lengths L1, L2...Li and the flow velocity of the medium entering the silencer, the frequency and noise reduction amount required to eliminate noise in the refrigerant circulation system are determined, ultimately leading to the design of an engineering-grade silencer. During the process of varying chamber lengths, the refrigerant circulation system does not require shutdown, evacuation, or recharging of refrigerant, nor does it require re-welding the silencer, saving development costs and time. Where M≥2, N≥1.

[0047] Optionally, the anechoic chamber includes a first tube body 11 and a second tube body 12. The first tube body 11 is columnar and has a hollow, through-hole cavity structure; the second tube body 12 is integrally connected to the first tube body 11, and the sidewalls of the second tube body 12 are W-shaped folded waves to form the folded portion, thereby adjusting the length of the second tube body 12.

[0048] An expansion cavity is formed inside the first tube body 11, and a folding cavity is formed inside the second tube body 12. When the folding cavity is fully expanded, its inner cross-sectional radius is the same as that of the expansion cavity.

[0049] The first pipe 2 and the second pipe 3 are symmetrically arranged on both sides of the air conditioner muffler body, which facilitates the refrigerant flow through the entire interior of the air conditioner muffler body and ensures the stable flow of refrigerant inside the muffler body.

[0050] Optionally, the folded cavity is located in the middle of the silencer cavity. This allows the first pipe 2 and the second pipe 3 to remain as parallel as possible. Compared to installing the folded cavity on either the first pipe 2 or the second pipe 3, this avoids the first pipe 2 deviating too much from the second pipe 3 during the expansion and contraction of the folded cavity, thus solving the problems of unstable silencer structure and poor silencing effect.

[0051] Optionally, the first piping 2 and the second piping 3 can be detachably connected to the throttle valve and / or the connecting pipe on the refrigerant circulation line via a connector.

[0052] Existing silencers are mostly integrated with the refrigerant circulation pipeline, welded to the copper pipe of the refrigerant circulation pipeline. The first pipe 2 and the second pipe 3 of this application can be detachably connected to the throttle valve and / or the connecting pipe on the refrigerant circulation pipeline via connectors. This allows for the external connection of an air conditioning silencer between the throttle valve and the connecting pipe of the refrigerant circulation pipeline without damaging the refrigerant circulation pipeline, thus solving the problem of pulsating noise caused by discontinuous refrigerant flow in the refrigerant circulation pipeline. The detachable first pipe 2 and second pipe 3 can be used with the throttle valve and connecting pipe, making the installation and removal of the air conditioning silencer more convenient.

[0053] Optionally, the connector is either a threaded connector or a nut. Specifically, the connector 2 of the first pipe 2 is a nut, and the connector of the second pipe 3 is a threaded connector. In the refrigerant circulation pipeline of the air conditioner, the expansion valve or the copper pipe of the refrigerant circulation pipeline is provided with a threaded connector, and the connecting pipe is provided with a nut. Therefore, when disassembling and connecting the muffler body to the expansion valve and / or the connecting pipe on the refrigerant circulation pipeline, the connector of the first pipe 2 is used to connect the expansion valve, and the connector of the second pipe 3 is used to connect the copper pipe.

[0054] Optionally, the connector is a rubber sleeve with a clamp. The rubber sleeve has a certain tightness. In use, the rubber sleeve is first opened, then put on the connecting pipe of the throttle valve and / or refrigerant circulation pipeline, and finally clamped by the clamp to achieve a stable connection between the rubber sleeve and the connecting pipe of the throttle valve and / or refrigerant circulation pipeline.

[0055] Optionally, the muffler further includes a first silencing layer and a second silencing layer, the first silencing layer being coated on the inner wall of the first tube body 11 and the second silencing layer being coated on the inner wall of the second tube body 12.

[0056] Specifically, the first and / or second sound-absorbing layers can be glass wool, fiber sound-absorbing materials, etc. Preferably, the first and second sound-absorbing layers have a bulk density of 15 kg / m³. 3 The ultra-fine glass wool is used. This not only improves the noise reduction effect of the air conditioner muffler, but also does not restrict the contraction and extension of the folding cavity.

[0057] Optionally, the muffler also includes a protective layer wrapped around the outer wall of the first tube body 11 and the second tube body 12. The protective layer protects the first tube body 11 and the second tube body 12, preventing damage to the muffler body 1. The protective layer includes a protective mesh.

[0058] Optionally, the silencing body 1 further includes a gradually expanding cavity 13 and a gradually contracting cavity 14. The large-diameter end of the gradually expanding cavity 13 is connected to the first port of the silencing chamber, and the small-diameter end of the gradually expanding cavity 13 is connected to the first piping 2; the large-diameter end of the gradually contracting cavity 14 is connected to the second port of the silencing chamber, and the small-diameter end of the gradually contracting cavity 14 is connected to the second piping 3. The first port and the second port are opposite ports at both ends of the silencing chamber, with the edge of the first pipe body 11 forming the first port and the edge of the second pipe body 12 forming the second port.

[0059] The internal spaces of the expanding cavity 13 and the contracting cavity 14 are frustum-shaped. When the folding cavity moves, the first expansion cavity or the second expansion cavity can move along the connection line between the first pipe 2 and the second pipe 3 to adjust the depth of the air conditioner muffler, making the muffler's noise level adjustable.

[0060] Optionally, the expanding cavity 13 and the contracting cavity 14 are symmetrically arranged. This eliminates the need to specifically adjust the order of the first piping 2 and the second piping 3 when installing the air conditioner muffler, making the operation more convenient.

[0061] Optionally, there are multiple partitions 4, and the through holes 41 of the multiple partitions 4 are arranged in a straight line between the first pipe 2 and the second pipe 3. The inner diameter of the through holes 41 of the partitions 4 is equal to the inner diameter of the first pipe 2 and / or the second pipe 3.

[0062] Compared to traditional silencers, the partition 4 can solve the problem of multiple silencers connected in series. Moreover, compared to multiple silencers connected in series, this application can more accurately measure the noise frequency and the amount of silence by adding the partition 4.

[0063] As an example, there is one partition 4, which divides the interior of the muffler into a first muffler chamber and a second muffler chamber, both of which include folded cavities.

[0064] When the muffler is fully folded, the effective length of the muffler includes: the length of the first muffler cavity L1, L1 = La0; and the second effective length L2, L2 = Lb0;

[0065] When the first chamber of the muffler is unfolded and the second chamber is folded, the effective length of the muffler includes: the length when fully folded, La0+Lb0, and the total length of the unfolded part, La1+La2+...Laj, where j≥1;

[0066] When the first chamber of the muffler is folded and the second chamber is partially unfolded, the effective length of the muffler includes: the length when fully folded La0+Lb0, and the total length of the unfolded part Lb1+Lb2+...Lbj, where j≥1;

[0067] When both the first and second chambers of the muffler are partially unfolded and partially folded, the effective length of the muffler includes: the length when fully folded, La0+Lb0, the total length of the unfolded portion of the first chamber, La1+La2+...+Laj, and the total length of the unfolded portion of the second chamber, Lb1+Lb2+...+Lbj, where j≥1.

[0068] By setting up partition 4, the silencer can change the length of at least one expansion cavity according to the noise test results of the whole air conditioner, thereby eliminating noise in different frequency bands and solving the problem of the narrow applicability of air conditioner silencers.

[0069] Optionally, in cooling mode, the first piping 2 is connected to the air conditioner compressor 5, and the second piping 3 is connected to the air conditioner condenser 6; in heating mode, the first piping 2 is connected to the air conditioner evaporator 7, and the second piping 3 is connected to the air conditioner compressor 5.

[0070] Specifically, the muffler is connected to the refrigerant circulation system. In cooling mode, the muffler is located between the compressor 5 discharge port and the condenser 6; in heating mode, the muffler is located between the compressor 5 and the evaporator 7. When an abnormal sound is heard from the compressor 5 in the refrigerant circulation system, the refrigerant pipes are not inserted initially. The refrigerant pipes on both sides of the muffler are connected to the first piping 2 and the second piping 3, respectively. The inner length of the muffler is adjusted until the abnormal sound is greatly reduced or disappears. The inner length of the muffler at this time is recorded.

[0071] Optionally, the material of the silencing body 1 is a rigid material. The silencing body 1 is made of plastic or metal, and preferably, the material of the silencing body 1 includes foamed metal. Foamed metal has excellent properties such as low density, good sound insulation performance, good heat insulation performance, and the ability to absorb electromagnetic waves, which can play a good role in sound insulation and heat insulation of the silencer.

[0072] Optionally, the air conditioner includes a refrigerant circulation pipeline and the aforementioned muffler. The refrigerant circulation pipeline includes a compressor 5, a condenser 6, a throttling element, and an evaporator 7 connected in sequence. Thermocouples are arranged in the middle of the exhaust port of the compressor 5, the condenser 6, and the evaporator 7. The muffler is connected in series in the refrigerant circulation pipeline.

[0073] Specifically, thermocouples are arranged at the exhaust port of compressor 5, in the middle of condenser 6, and in the middle of evaporator 7. The temperatures returned during the operation of the air conditioner are Td, Tc, and Te, respectively.

[0074] As an example, when the refrigerant circulation system produces an abnormal sound from compressor 5, adjust the lengths of the first chamber L1 and the second chamber L2 of the muffler until the abnormal sound is greatly reduced or disappears, and record the lengths of the first chamber L1 and the second chamber L2 of the muffler at this time.

[0075] For refrigeration operation, the refrigerant velocity can be calculated as follows: Based on the temperature Tc in the middle of condenser 6, refer to the saturated state property parameter table for the refrigerant to obtain the saturated pressure Pc; Pc is approximately the pressure of the refrigerant at the exhaust port. Therefore, based on the exhaust port temperature Td and Pc, the velocity C of the superheated refrigerant can be obtained; at this time, the noise frequency that the silencer can eliminate is F = (2n+1)*C / (4*L), where n is the number of folded cavities and L is the effective length of the cavity;

[0076] For heating operation, the refrigerant velocity can be calculated as follows: Based on the temperature Te at the center of the evaporator, refer to the saturated state property parameter table for the refrigerant to obtain the saturated pressure Pe; Pe is approximately the pressure of the refrigerant at the exhaust port. Therefore, based on the exhaust port temperature Td and Pe, the velocity C of the superheated refrigerant can be obtained; the noise frequency that the silencer can eliminate is F = (2n+1)*C / (4*L), where n is the number of folded cavities and L is the effective length of the cavity.

[0077] Optionally, two silencers are used, connected in series on the refrigerant circulation line. Compared to traditional silencers, this application requires fewer silencers to eliminate noise in different frequency ranges, thus solving the problem of the narrow applicability of air conditioner silencers.

[0078] As an example, for a single-cooling unit, the silencer can be installed between the compressor 5 discharge port and the condenser 6, and between the compressor 5 return port and the evaporator 7. For a heat pump unit, the silencer can be installed between the compressor 5 discharge port and the four-way valve 8, between the compressor 5 return port and the four-way valve 8, or between the four-way valve 8 and the evaporator 7.

[0079] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A silencer, characterized in that, Connected in series in the refrigerant circulation line, the silencer includes: The silencing body has a silencing chamber inside, which includes a first tube and a second tube. The first tube is a hollow, through-hole cavity structure, and the sidewalls of the second tube are W-shaped folds to form folds, thereby adjusting the length of the second tube. The silencing body also includes a gradually expanding cavity and a gradually contracting cavity. The large-diameter end of the gradually expanding cavity is connected to the first port of the silencing chamber, and its small-diameter end is connected to the first piping. The large-diameter end of the gradually contracting cavity is connected to the second port of the silencing chamber, and its small-diameter end is connected to the second piping. The silencer includes a first pipe and a second pipe, respectively connected to both ends of the silencer body; wherein the first pipe and the second pipe can be detachably connected to a throttle valve and / or a connecting pipe on the refrigerant circulation pipeline via connectors, so as to connect the silencer to the pipeline without damaging the refrigerant circulation pipeline; and, A partition plate with through holes divides the anechoic chamber into two or more anechoic cavities. At least one of the anechoic cavities includes a folded portion with N foldable and stretchable folded cavities. The folded cavities are located in the middle of the anechoic cavities to keep the first pipe and the second pipe parallel. When the folded cavities are fully extended, their inner cross-sectional radius is the same as that of the inner cross-sectional radius of the first pipe. The partitions consist of multiple partitions, with through holes arranged in a straight line between the first and second pipes to create multiple silencing chambers inside the muffler. The inner diameter of the through holes is equal to the inner diameter of the first and second pipes.

2. The silencer according to claim 1, characterized in that, The anechoic chamber includes: The first tube body is cylindrical and has a hollow, through-hole structure; and, The second tube is integrally connected to the first tube. The sidewall of the second tube is folded in a W-shape to form the folded portion, thereby adjusting the length of the second tube.

3. The silencer according to claim 1, characterized in that, The noise reduction body also includes: The gradually expanding cavity has its large-diameter end connected to the first port of the anechoic chamber, and its small-diameter end connected to the first piping; and, The converging cavity has its large-diameter end connected to the second port of the silencing chamber, and its small-diameter end connected to the second piping.

4. The silencer according to claim 3, characterized in that, The expanding cavity and the contracting cavity are arranged symmetrically.

5. The silencer according to claim 1, characterized in that, In cooling mode, the first piping is connected to the air conditioner's compressor, and the second piping is connected to the air conditioner's condenser; In heating mode, the first piping is connected to the evaporator of the air conditioner, and the second piping is connected to the compressor of the air conditioner.

6. The silencer according to claim 1, characterized in that, The sound-absorbing body is made of a rigid material.

7. An air conditioner, characterized in that, include: A refrigerant circulation pipeline includes a compressor, a condenser, a throttling element, and an evaporator connected in sequence, wherein thermocouples are arranged at the discharge port of the compressor, in the middle of the condenser, and in the evaporator; and, The muffler as described in any one of claims 1 to 6, wherein the muffler is connected in series in the refrigerant circulation line.

8. The air conditioner according to claim 7, characterized in that, There are two silencers, which are connected in series on the refrigerant circulation pipeline.

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