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 first pipe, a second pipe and an inner connecting pipe. The first pipe comprises a first folding pipe section; the second pipe is fixed at two ends of the silencer body with the first pipe; one end of the inner connecting pipe is inserted into the first pipe and penetrates into a silencing chamber, and the other end of the inner connecting pipe is used for connecting to a refrigerant circulating system; a positioning point is arranged at the middle part of the inner connecting pipe, and the positioning point is fixedly connected with the end part of the first pipe; the first folding pipe section can be expanded or contracted, and the first folding pipe section is used for adjusting the depth of the inner connecting pipe penetrating into the silencing chamber. The length of the inner connecting pipe in the silencing cavity is variable, the length of the silencing chamber and the length of the inserted inner connecting pipe are used for judging the frequency and the sound elimination amount which need to be eliminated by the system, so that the problem that the silencer needs to be frequently replaced in the process of optimizing and improving the air conditioner noise 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. A 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 silencers are cylindrical, centrally located structures connected in series within the outdoor unit's piping. Silencers come in various sizes, differing primarily in length, diameter, cavity volume, and shape. Different sized silencers are suitable for reducing different types of noise and noise from different compressor frequency ranges. Air conditioner refrigerant noise mainly includes refrigerant airflow and liquid flow noise, as well as the sounds of pipe vibration and collision. The noise level is related to the refrigerant quantity, flow rate, pipe diameter, pipe routing, and installation method. The usual solution is to connect a silencer in series within the piping.

[0003] In related technologies, silencers are typically produced by first determining the piping scheme, then conducting noise tests on the outdoor unit of the air conditioner to obtain the peak frequency of the abnormal noise. Based on this frequency, sound velocity, and piping specifications, a silencer is selected. Then, a custom-made piping system with a fixed length for the silencer is installed, 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] The silencers in related technologies often cannot adjust the cavity volume and can only use a single model of silencer. Such a single model of silencer can only have a good noise reduction effect under fixed operating conditions, and cannot meet the requirements of good noise reduction under all operating conditions. In addition, it cannot properly adjust the air conditioner, increasing the adjustment cost. 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 an expandable and retractable first folded pipe section. By adjusting the length of the inner pipe within the muffler cavity, it is possible to eliminate the passing frequencies of different frequency bands, thus solving the problem of frequent muffler replacements during the optimization and improvement of air conditioning noise, and saving development time and costs.

[0008] In some embodiments, the silencer includes a silencer body, a first pipe, a second pipe, and an inner pipe. The silencer body has a silencer chamber; the first pipe includes a first folded pipe section; the second pipe is fixed to both ends of the silencer body; the inner pipe includes a first end and a second end opposite to each other, the first end being inserted into the first pipe and extending into the silencer chamber, and the second end being used to connect to a refrigerant circulation system. A positioning point is provided in the middle of the inner pipe, and the positioning point is fixedly connected to the end of the first pipe. The first folded pipe section can be expanded or contracted to adjust the depth of the inner pipe extending into the silencer chamber.

[0009] In some alternative embodiments, the anechoic chamber includes a communicating expansion cavity and a folding cavity, the folding cavity being expandable or contractable to adjust the length of the internal chamber of the anechoic body.

[0010] In some alternative embodiments, the silencing body 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 folded waves, so as to adjust the length of the folded cavity inside the second tube by folding / unfolding the second tube.

[0011] In some alternative embodiments, the expansion cavity includes a first expansion cavity and a second expansion cavity, with the folded cavity located between the first expansion cavity and the second expansion cavity.

[0012] In some optional embodiments, the silencing body further includes a gradually expanding cavity and a gradually contracting cavity. The large-diameter end of the gradually expanding cavity is connected to the first expansion cavity, 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 expansion cavity, and its small-diameter end is connected to the second piping.

[0013] In some alternative embodiments, the expanding cavity and the contracting cavity are arranged symmetrically.

[0014] In some alternative embodiments, the silencer further includes a connecting pipe with opposing third and fourth ends. The third end is inserted into the second piping and extends into the silencer chamber, and the fourth end is used to connect to the refrigerant circulation system. A mating point is provided in the middle of the connecting pipe, and the mating point is fixedly connected to the end of the second piping. The second piping includes a second folded pipe section to adjust the length of the connecting pipe extending into the silencer chamber.

[0015] In some alternative embodiments, the silencer further includes a partition with through holes, the partition dividing the silencer chamber into two or more silencer cavities, at least one of the silencer cavities including a folded portion having N foldable and stretchable folded cavities.

[0016] 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.

[0017] In some embodiments, the air conditioner includes a refrigerant circulation pipeline, which includes a compressor, a condenser, a throttling element and an evaporator connected in sequence. A thermocouple and the aforementioned muffler are arranged in the middle of the compressor's exhaust port, the condenser and the evaporator, and the muffler is connected in series in the refrigerant circulation pipeline.

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

[0019] The silencer includes a silencer body, a first piping, a second piping, and an inner pipe. The silencer body has a silencer chamber. The first piping includes a first folded pipe section. The second piping is fixed to both ends of the silencer body. The inner pipe includes a first end and a second end, the first end being inserted into the first piping and extending into the silencer chamber, and the second end being used to connect to the refrigerant circulation system. A positioning point is provided in the middle of the inner pipe, which is fixedly connected to the end of the first piping. The first folded pipe section can be expanded or contracted to adjust the depth of the inner pipe extending into the silencer chamber. The length of the inner pipe used in this application is variable. By utilizing the length of the inner pipe inserted into the silencer chamber, the frequency and amount of noise reduction achieved by the refrigerant circulation system can be better determined, resulting in a silencer that can be engineered for practical application. During the adjustment of the inner pipe length, the refrigerant circulation system does not need to be shut down, evacuated, or recharged, nor does it require re-welding the silencer, thus solving the problem of frequent silencer replacements during air conditioning noise optimization and improvement.

[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 silencer provided in this embodiment of the disclosure;

[0024] Figure 3 This is a schematic diagram of the structure of the muffler with the folded tube section fully extended in the embodiment of this disclosure;

[0025] Figure 4 This is a schematic diagram of the structure of the folded tube section of the muffler provided in the embodiments of this disclosure in a folded state;

[0026] Figure 5 This is a schematic diagram of another overall structure of a muffler provided in an embodiment of this disclosure;

[0027] Figure 6 This is a partial structural diagram of the muffler connected to the refrigerant circulation pipeline provided in an embodiment of this disclosure;

[0028] Figure 7 This is another partial structural diagram of the muffler connected to the refrigerant circulation pipeline provided in the embodiments of this disclosure.

[0029] Figure label:

[0030] 1: Silencing body; 11: First piping; 12: Second piping; 13: First folded pipe section; 14: Positioning point; 2: Inner pipe; 3: Butt pipe; 41: Expansion chamber; 42: Folded chamber; 51: Gradual expansion chamber; 52: Gradual contraction chamber; 6: Baffle; 7: Compressor; 8: Evaporator; 9: Condenser; 10: Four-way valve. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Unless otherwise stated, the term "multiple" means two or more.

[0036] 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.

[0037] 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.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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, thus attenuating noise.

[0043] An expansion silencer consists of two basic components: a tube and a chamber. Its most basic form is the single-section expansion silencer.

[0044] The frequency at which traditional expansion-type mufflers eliminate noise is related to the effective length L of the muffler. When L is constant, the muffler can only eliminate noise at a fixed number of frequencies.

[0045] 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 from the system, connecting the new muffler, evacuating the system, and recharging the refrigerant.

[0046] Combination Figure 1-7 As shown, this disclosure provides a muffler and an air conditioner.

[0047] The silencer provided in this embodiment includes a silencer body 1, a first pipe 11, a second pipe 12, and an inner pipe 2. A silencer chamber is formed inside the silencer body 1. The first pipe 11 includes a first folded pipe section 13. The second pipe 12 is fixed to both ends of the silencer body 1. The inner pipe 2 includes a first end and a second end, the first end being inserted into the first pipe 11 and extending into the silencer chamber, and the second end being used to connect to a refrigerant circulation system. A positioning point 14 is provided in the middle of the inner pipe 2, and the positioning point 14 is fixedly connected to the end of the first pipe 11. The first folded pipe section 13 can be expanded or contracted, and is used to adjust the depth of the inner pipe 2 extending into the silencer chamber.

[0048] During use, the aforementioned silencer needs to be connected to the refrigerant circulation system. The airflow enters the silencing chamber along the inner pipe and finally exits through the second pipe 12. Furthermore, since the length of the inner pipe 2 inserted into the silencing chamber is adjustable, the acoustic impedance of the noise inside the silencer body 1 can be adjusted to eliminate noise in various frequency bands.

[0049] Specifically, in the initial state of the folded cavity, when the length of the inner tube 2 inserted into the silencing chamber is equal to 1 / 2 of the length of the silencing chamber, it can eliminate odd-numbered multiples of the passing frequency; when the length of the inner tube 2 inserted into the silencing chamber is equal to 1 / 4 of the length of the silencing chamber, it can eliminate even-numbered multiples of the passing frequency.

[0050] Optionally, the anechoic chamber includes a connected expansion cavity 41 and a folding cavity 42, the folding cavity 42 being expandable or contractable to adjust the length of the internal chamber of the anechoic body 1.

[0051] With the inner tube 2 adjusted to the preset length, when the muffler is fully folded, the effective length L of the muffler is L0; when the muffler is partially folded and partially unfolded, the length L of the muffler cavity is the length L0 when fully folded plus the total length L1 of the unfolded part, L = L0 + L1; when the muffler is fully unfolded, the length of the muffler is L = L0 + L1 + L2 + ... + Ln.

[0052] This application utilizes the effective length of the folded cavity 42 and the length of the inner pipe 2 inserted into the silencing chamber to better determine the frequency and amount of noise reduction in the refrigerant circulation system, thus obtaining a silencer that can be engineered for practical application. During the adjustment of the length of the inner pipe 2, the refrigerant circulation system does not need to be shut down, evacuated, or recharged with refrigerant, nor does it require re-welding the silencer, solving the problem of frequent silencer replacements during the optimization and improvement of air conditioning noise.

[0053] Optionally, the muffler body 1 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 sidewall of the second tube is W-shaped and wavy, so as to adjust the length of the folded cavity 42 inside the second tube by folding / unfolding the second tube.

[0054] An expansion cavity 41 is formed inside the first tube, and a folding cavity 42 is formed inside the second tube. When the folding cavity 42 is fully expanded, its inner cross-sectional radius is the same as that of the expansion cavity 41.

[0055] The first pipe 11 and the second pipe 12 are symmetrically arranged on both sides of the muffler body 1, which facilitates the refrigerant to flow through the entire interior of the muffler body and ensures the stable flow of the refrigerant inside the muffler body 1.

[0056] Optionally, the muffler further includes a first silencing layer and a second silencing layer, wherein the first silencing layer is coated on the inner wall of the first pipe body and the second silencing layer is coated on the inner wall of the second pipe body.

[0057] 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 muffler, but also does not restrict the contraction and extension of the folded cavity.

[0058] Optionally, the muffler also includes a protective layer wrapped around the outer walls of the first and second pipe bodies. This protective layer protects the first and second pipe bodies, preventing damage to the muffler body 1. The protective layer includes a protective mesh.

[0059] Optionally, the expansion cavity 41 includes a first expansion cavity and a second expansion cavity, and the folding cavity 41 is located between the first expansion cavity and the second expansion cavity. In this way, when adjusting the inner length of the muffler, its extension and retraction direction can always move along the connection line between the first pipe 11 and the second pipe 12, thereby avoiding the problem of bending the refrigerant pipe of the refrigerant circulation system connected to the muffler due to inconsistent directions of the first pipe 11 and the second pipe 12.

[0060] Optionally, the silencing body 1 further includes a gradually expanding cavity 51 and a gradually contracting cavity 52. ​​The large-diameter end of the gradually expanding cavity 51 is connected to the first expansion cavity, and the small-diameter end of the gradually expanding cavity 51 is connected to the first piping 11; the large-diameter end of the gradually contracting cavity 52 is connected to the second expansion cavity, and the small-diameter end of the gradually contracting cavity 52 is connected to the second piping 12.

[0061] The internal spaces of the expanding cavity 51 and the contracting cavity 52 are frustum-shaped. When the folding cavity 42 moves, the first expansion cavity or the second expansion cavity can move along the connection line between the first pipe 11 and the second pipe 12 to adjust the depth of the muffler, making the muffler's noise level adjustable.

[0062] Optionally, the expanding cavity 51 and the contracting cavity 52 are arranged symmetrically. This eliminates the need to specifically adjust the order of the first piping 11 and the second piping 12 when installing the silencer, making the operation more convenient.

[0063] Optionally, the silencer also includes a connecting pipe 3, which includes a third end and a fourth end opposite to each other. The third end is inserted into the second pipe 12 and extends into the silencer chamber, and the fourth end is used to connect to the refrigerant circulation system. A docking point is provided in the middle of the connecting pipe 3, and the docking point is fixedly connected to the end of the second pipe 12. The second pipe 12 includes a second folded pipe section to adjust the length of the connecting pipe 12 extending into the silencer chamber.

[0064] Inserting a tube into an expansion-type silencer can improve its noise reduction performance. When the inserted tube length is equal to half the length of the anechoic chamber, it can eliminate odd-numbered frequencies; when the inserted tube length is equal to one-quarter the length of the anechoic chamber, it can eliminate even-numbered frequencies. Combining both, by inserting an inner tube 2 and a connecting tube 3 into both ends of the silencer, with the inner tube 2 inserted to a length equal to half the length of the anechoic chamber and the connecting tube 3 inserted to a length equal to one-quarter the length of the anechoic chamber, a noise reduction characteristic with no passing frequencies can be obtained.

[0065] Optionally, in cooling mode, the internal pipe 2 is connected to the air conditioner compressor 7, and the external pipe 3 is connected to the air conditioner condenser 9; in heating mode, the internal pipe 2 is connected to the air conditioner evaporator 8, and the external pipe 3 is connected to the air conditioner compressor 7.

[0066] Specifically, the muffler is connected to the refrigerant circulation system. In cooling mode, the muffler is located between the compressor 7 discharge port and the condenser 9; in heating mode, the muffler is located between the compressor 7 and the evaporator 8. When abnormal noise from the compressor 7 is heard in the refrigerant circulation system, the refrigerant pipes on both sides of the muffler are connected to the inner pipe 2 and the connecting pipe 3, respectively. By adjusting the lengths of the inner pipe 2 and the connecting pipe 3 within the muffler chamber, the abnormal noise can be significantly reduced or eliminated. Furthermore, by adjusting the effective length of the folded cavity, the noise frequency can be completely eliminated.

[0067] Optionally, F = (2n+1)*C / (4*L); where the second tube has n foldable and stretchable folded cavities 42; the noise frequency of the silencer is F, the sound velocity of the refrigerant in the superheated state is C, and the total length of the expansion cavity 41 and the folded cavity 42 is L.

[0068] Specifically, under refrigeration conditions, the saturated state physical property parameter table of the refrigerant is consulted based on the temperature Tc in the middle of the condenser 9 to obtain the pressure Pc in the saturated state; Pc is approximately the pressure of the refrigerant at the discharge port of the compressor 7. Based on the discharge port temperature Td and Pc, the sound velocity C of the refrigerant in the superheated state is obtained; at this time, the noise frequency that the silencer can eliminate is F = (2n+1)*C / (4*L).

[0069] Under heating conditions, the pressure Pe under saturated conditions is obtained by referring to the saturated state property parameter table of the refrigerant based on the temperature Te in the middle of the evaporator 8. Pe is approximately the pressure of the refrigerant at the exhaust port. Therefore, the sound velocity C of the superheated refrigerant can be obtained based on the exhaust port temperature Td and Pe. At this time, the noise frequency that the silencer can eliminate is F = (2n+1)*C / (4*L).

[0070] Optionally, Where TL represents the amount of noise eliminated by the muffler, the inner diameter cross-sectional area of ​​the inner tube and the connecting tube is S1, and the inner diameter cross-sectional area of ​​the expansion cavity 41 is S2. Thus, the noise level of the muffler can be obtained solely from the inner diameter cross-sectional areas of the inner tube 2 and the connecting tube 3, and the inner diameter cross-sectional area of ​​the expansion cavity 41.

[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 silencer also includes a partition 6 with through holes, the partition 6 dividing the silencer chamber into two or more silencer cavities, at least one of the silencer cavities including a folded portion having N foldable and stretchable folded cavities 42.

[0073] The partition 4 divides the interior of the muffler into a first muffler chamber and a second muffler chamber, both of which include a folded cavity 42.

[0074] 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;

[0075] 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;

[0076] 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;

[0077] 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.

[0078] By setting up partition 6, 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 silencer's narrow applicable range.

[0079] Optionally, there are multiple partitions 6, and the through holes of the multiple partitions 6 are arranged in a straight line between the first pipe 11 and the second pipe 12. The inner diameter of the through hole of the partition 6 is equal to the inner diameter of the first pipe 11 and / or the second pipe 12.

[0080] Compared to traditional silencers, the partition 6 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 6.

[0081] Optionally, the internal pipe is connected to the air conditioner compressor 7, and the external pipe is connected to the air conditioner four-way valve 10; or, the internal pipe is connected to the air conditioner four-way valve 10, and the external pipe is connected to the air conditioner evaporator 8.

[0082] Specifically, for a single-cooling unit, the silencer can be installed between the compressor 7 exhaust port and the condenser 9, and between the compressor 7 return port and the evaporator 8. For a heat pump unit, the silencer can be installed between the compressor 7 exhaust port and the four-way valve 10, between the compressor 7 return port and the four-way valve 10, and between the four-way valve 10 and the evaporator 8. In the silencer commissioning process, this application allows for the use of a single silencer to meet the requirements of the air conditioner commissioning process, eliminating the need for multiple silencers to select the most suitable one, thus improving commissioning efficiency. Furthermore, the silencer structure of this application is simple, reducing the production cost of the commissioning process.

[0083] 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 muffler characterized by comprising: It comprises: a sound attenuation body with a sound attenuation chamber inside; a first pipe comprising a first foldable pipe section; a second pipe fixed at both ends of the sound attenuation body with the first pipe; and an inner connecting pipe comprising opposite first and second end portions, the first end portion inserted into the first pipe and deep into the sound attenuation chamber, and the second end portion used for connecting to a refrigerant circulation system, a middle portion of the inner connecting pipe being provided with a positioning point fixedly connected with an end portion of the first pipe; wherein the first foldable pipe section is expandable or contractible to adjust the length of the inner connecting pipe deep into the sound attenuation chamber; the sound attenuation chamber comprises a communication expansion cavity and a foldable cavity, the foldable cavity being expandable or contractible to adjust the length of the cavity inside the contracted sound attenuation body; the sound attenuation body comprises a second pipe body, a side wall of the second pipe body being in a folded wave shape to adjust the length of the foldable cavity inside the second pipe body under the driving of the folding / unfolding of the second pipe body; the second pipe body has n foldable and stretchable foldable cavities, the noise frequency of the sound attenuation device is F, the sound speed of the overheat state refrigerant is C, the total length of the expansion cavity and the foldable cavity is L, and F=(2n+1)*C / (4*L).

2. The muffler of claim 1, wherein The sound attenuation body further comprises: a first pipe body in a columnar shape and a hollow through cavity structure; wherein the second pipe body is integrally connected with the first pipe body, and a side wall of the second pipe body is in a W-shaped folded wave shape.

3. The sound attenuation device according to claim 1, wherein the expansion cavity comprises a first expansion cavity and a second expansion cavity, and the foldable cavity is located between the first and second expansion cavities.

4. The muffler of claim 3, wherein The sound attenuation body further comprises: a gradually expanding cavity connected at a large-diameter end with the first expansion cavity and at a small-diameter end with the first pipe; and a gradually contracting cavity connected at a large-diameter end with the second expansion cavity and at a small-diameter end with the second pipe.

5. The sound attenuation device according to claim 4, wherein the gradually expanding cavity and the gradually contracting cavity are symmetrically arranged.

6. The muffler of claim 1, wherein It further comprises: a butt joint pipe comprising opposite third and fourth end portions, the third end portion inserted into the second pipe and deep into the sound attenuation chamber, and the fourth end portion used for connecting to the refrigerant circulation system, a middle portion of the butt joint pipe being provided with a butt joint point fixedly connected with an end portion of the second pipe; the second pipe comprises a second foldable pipe section to adjust the length of the butt joint pipe deep into the sound attenuation chamber.

7. The muffler of claim 1, wherein It further comprises: a partition plate provided with a through hole, the partition plate dividing the sound attenuation chamber into two or more sound attenuation cavities, at least one of the sound attenuation cavities comprising a foldable portion with N foldable and stretchable foldable cavities.

8. The sound attenuation device according to claim 7, wherein the number of the partition plates is multiple, and the through holes of the multiple partition plates are arranged in a linear shape between the first and second pipes.

9. An air conditioner characterized by comprising: It comprises: a refrigerant circulation system comprising a compressor, a condenser, a throttling element and an evaporator connected in sequence, a thermocouple arranged at a discharge port of the compressor, a middle portion of the condenser and a middle portion of the evaporator; and the sound attenuation device according to any one of claims 1 to 8 connected in series on the refrigerant circulation system.

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