Muffler, method of determining porosity of a baffle within a muffler, and air conditioning system

Abstract

This application relates to the field of silencer technology, disclosing a silencer comprising: a silencer cavity; and a partition assembly disposed within the silencer cavity, including a rotating shaft and multiple partitions; the surfaces of the multiple partitions abut against each other, dividing the silencer cavity into a first chamber and a second chamber; the first chamber has a silencer inlet, and the second chamber has a silencer outlet; the rotating shaft passes through the center of the multiple partitions, allowing the partitions to rotate around the rotating shaft; and each partition has multiple silencer holes, the rotation trajectories of the silencer holes on adjacent partitions at least partially overlap, thereby adjusting the porosity of the stacked partitions by rotating one or more of the partitions. This application also discloses a method for determining the porosity of the partitions within a silencer and an air conditioning system.

Description

Technical Field

[0001] This application relates to the field of silencer technology, such as a silencer, a method for determining the porosity of the internal baffle of a silencer, and an air conditioning system. Background Technology

[0002] Air conditioning systems suffer from various types of noise, originating from sources such as compressors, fans, heat exchangers, and piping systems. The piping system, in particular, contains various valves and has a complex layout. Under certain operating conditions, the refrigerant flow parameters change drastically, resulting in fluid noise that severely impacts comfort.

[0003] A silencer is disclosed in related technology. The silencer is installed on the duct of an air conditioning system. The silencer has a baffle plate inside, and the baffle plate has sound-absorbing holes. The sound-absorbing holes on the baffle plate are used to eliminate abnormal noise.

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

[0005] The porosity of the baffle plate directly affects the muffler's noise reduction effect. To make the muffler compatible with the air conditioning system, developers need to repeatedly disassemble the muffler from the pipeline and replace the baffle plate with one of different porosities. After repeated testing, the optimal porosity for good noise reduction is determined. Disassembling the muffler requires temporarily recovering the refrigerant to the compressor or heat exchanger, and then recharging the refrigerant and repeating the test after installation. This results in wasted baffle plate material and a complex development process with long testing times.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] 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.

[0008] This disclosure provides a muffler, a method for determining the porosity of the inner baffle of the muffler, and an air conditioning system, which solves the problem that the optimal porosity of the inner baffle of the muffler is difficult to determine during the development process.

[0009] In some embodiments, the muffler includes:

[0010] Silencing cavity;

[0011] A partition assembly, disposed within the silencing cavity, includes a rotating shaft and multiple partitions; the surfaces of the multiple partitions abut against each other and divide the silencing cavity into a first chamber and a second chamber; the first chamber has a silencing inlet, and the second chamber has a silencing outlet; the rotating shaft passes through the center of the multiple partitions, so that the partitions can rotate around the rotating shaft;

[0012] Furthermore, each of the partitions is provided with multiple sound-absorbing holes, and the rotation trajectories of the sound-absorbing holes on adjacent partitions at least partially overlap, thereby adjusting the porosity of all the partitions after stacking by rotating one or more of the partitions.

[0013] Optionally, at least one of the partitions has a swivel protrusion on its side;

[0014] The side of the silencing cavity is provided with a limiting groove, which corresponds to the swivel protrusion; and the swivel protrusion extends out of the silencing cavity through the limiting groove. By moving the swivel protrusion within the limiting groove, the partition plate is driven to rotate.

[0015] Optionally, the spiral protrusion is formed by protruding from the side of the partition.

[0016] Optionally, the limiting groove is provided with a positioning structure, which is used to fix the swivel within the limiting groove.

[0017] Optionally, the partition assembly includes three partitions, namely a first partition, a second partition, and a third partition;

[0018] The sides of the first partition, the second partition, and the third partition are all disposed in close contact with the inner wall of the silencing cavity;

[0019] The second partition and the third partition are each provided with a spiral protrusion on their side, and both spiral protrusions are located within the limiting groove.

[0020] Optionally, a plurality of the sound-absorbing holes are evenly arranged around the center of the partition.

[0021] Optionally, the sound-absorbing holes on the same partition plate form multiple sets of concentric circular trajectories when rotating.

[0022] In some embodiments, the method for determining the porosity of the inner baffle of the muffler includes the muffler described in any of the above embodiments, the method comprising:

[0023] Rotate one or more of the partitions to maximize the porosity of the stacked partitions;

[0024] Refrigerant is introduced through the silencing inlet, and the baffle is rotated multiple times to adjust the porosity. The noise value of the silencing cavity is obtained after each rotation.

[0025] The optimal porosity is determined by using multiple noise values.

[0026] Optionally, determining the optimal porosity through multiple noise values ​​includes:

[0027] Compare the magnitudes of multiple noise values ​​and select the porosity corresponding to the lowest noise value as the optimal porosity.

[0028] In some embodiments, the air conditioning system includes the muffler described in any of the above embodiments.

[0029] The muffler, the method for determining the porosity of the muffler's inner baffle, and the air conditioning system provided in this disclosure can achieve the following technical effects:

[0030] After installing the silencer into the piping, developers can introduce refrigerant and then continuously rotate the baffles. During this rotation, the volume of the pores formed by the overlapping silencer holes on all the baffles changes continuously, thus adjusting the porosity and facilitating optimal debugging. This eliminates the need for developers to repeatedly disassemble and reassemble the silencer in the air conditioning system piping, to frequently replace ordinary baffles with different porosities by opening the silencer's interior, and to repeatedly recover and recharge the refrigerant in the piping. During debugging, only rotating the baffles is needed to adjust the porosity, simplifying the development process, shortening testing time, and avoiding material waste.

[0031] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0032] 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:

[0033] Figure 1 This is a cross-sectional schematic diagram of the muffler provided in an embodiment of this disclosure;

[0034] Figure 2 This is a schematic diagram of the structure of the muffler provided in the embodiments of this disclosure;

[0035] Figure 3 This is a schematic diagram of the structure of the partition provided in the embodiment of this disclosure;

[0036] Figure 4 This is a schematic diagram showing the overlapping of sound-absorbing holes on multiple partitions provided in an embodiment of this disclosure;

[0037] Figure 5 This is a schematic diagram of another partition structure provided in an embodiment of this disclosure;

[0038] Figure 6 This is a schematic diagram of another partition structure provided in an embodiment of this disclosure.

[0039] Figure label:

[0040] 100: Silencing cavity; 101: First chamber; 102: Second chamber; 110: Limiting groove; 120: Positioning structure;

[0041] 200: Rotating shaft; 201: Stop block; 210: Partition; 211: First partition; 212: Second partition; 213: Third partition; 220: Silencing hole; 230: Rotary convexity. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Unless otherwise stated, the term "multiple" means two or more.

[0047] 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.

[0048] 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.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0050] Combination Figure 1-6 As shown, this embodiment of the present disclosure provides a silencer, including a silencer cavity 100 and a partition assembly. The partition assembly is disposed within the silencer cavity 100 and includes a rotating shaft 200 and multiple partitions 210. The surfaces of the multiple partitions 210 are abutted against each other, dividing the silencer cavity 100 into a first chamber 101 and a second chamber 102. The first chamber 101 has a silencer inlet, and the second chamber 102 has a silencer outlet. The rotating shaft 200 passes through the center of the multiple partitions 210, allowing the partitions 210 to rotate around the shaft 200. Furthermore, each partition 210 has multiple silencer holes 220, and the rotation trajectories of the silencer holes 220 on adjacent partitions 210 at least partially overlap, thereby adjusting the porosity of the stacked partitions 210 by rotating one or more partitions 210.

[0051] In this embodiment, all partitions 210 can rotate around the pivot 200. Since the rotational trajectories of the silencing holes 220 on adjacent partitions 210 at least partially overlap, rotation always ensures that the silencing holes 220 on adjacent partitions 210 partially or completely overlap. When the silencing holes 220 on adjacent partitions 210 partially or completely overlap, refrigerant is introduced into the first chamber 101 from the silencing inlet. The refrigerant passes through the overlapping holes of the partitions 210 and enters the second chamber 102, finally exiting the silencer from the silencing outlet. During the refrigerant flow, vortices are generated when it flows through the overlapping holes, dissipating pulsating energy and increasing sound transmission loss, thereby achieving the silencing effect.

[0052] Porosity refers to the percentage of pore volume in a bulk material to the total volume of the material in its natural state. Therefore, in this embodiment, the porosity of all the stacked partitions 210 refers to the percentage of the volume of pores formed by the overlapping of the sound-absorbing holes 220 on all the partitions 210 to the total volume of all the partitions 210. Porosity directly affects the sound-absorbing effect of the partition assembly. Therefore, during the development and testing phase, after the silencer is installed on the air conditioning system's piping, the developers need to continuously adjust the porosity to obtain the optimal porosity suitable for the air conditioning system, thereby developing a silencer with better sound-absorbing effect.

[0053] Using the silencer provided in this embodiment, developers can install the silencer into the pipeline and then introduce refrigerant. By continuously rotating the baffle 210, the volume of the pores formed by the overlapping of the silencing holes 220 on all the baffles 210 changes continuously during rotation, thus adjusting the porosity and facilitating the determination of the optimal porosity. This eliminates the need for developers to repeatedly disassemble and reassemble the silencer in the air conditioning system pipeline, to frequently replace ordinary baffles with different porosities by opening the silencer's interior, and to repeatedly recover and recharge the refrigerant in the pipeline. During debugging, only rotating the baffle 210 is required to adjust the porosity, simplifying the development process, shortening testing time, and avoiding material waste. Once the optimal porosity is obtained, ordinary baffles with the optimal porosity can be directly installed inside the silencer during the production stage.

[0054] Optionally, such as Figure 2 As shown, at least one partition 210 has a swivel protrusion 230 on its side; the side of the silencing cavity 100 has a limiting groove 110, which corresponds to the swivel protrusion 230; and the swivel protrusion 230 extends out of the silencing cavity 100 through the limiting groove 110. By moving the swivel protrusion 230 within the limiting groove 110, the partition 210 is driven to rotate.

[0055] In this embodiment, the swivel protrusion 230 extends out of the silencing cavity 100 through the limiting groove 110, and the extending direction of the limiting groove 110 is consistent with the rotation direction of the partition 210. The developers move the swivel protrusion 230 within the limiting groove 110, at which time the swivel protrusion 230 drives the partition 210 to rotate synchronously, and the porosity of the partition 210 is adjusted when it rotates.

[0056] Optionally, the swivel protrusion 230 is formed by protruding from the side of the partition 210. This simplifies the connection structure between the swivel protrusion 230 and the partition 210.

[0057] Optionally, the partition assembly includes three partitions 210, namely a first partition 211, a second partition 212, and a third partition 213 in sequence; the sides of the first partition 211, the second partition 212, and the third partition 213 are all abutted against the inner wall of the silencing cavity 100; wherein, the sides of the second partition 212 and the third partition 213 are each provided with a swivel protrusion 230, and both swivel protrusions 230 are located within the limiting groove 110. Figure 1 The curly braces in the text represent three partitions 210, referred to as the first partition 211, the second partition 212, and the third partition 213. It is not that the first partition 211, the second partition 212, and the third partition 213 constitute partition 210.

[0058] In this embodiment, multiple partitions 210 are disposed in the middle of the silencing cavity 100, and the surfaces of the partitions 210 are parallel to the cross-section of the silencing cavity 100. This arrangement of the partitions 210 is beneficial to improving the silencing effect. With three partitions 210, the porosity can be effectively adjusted by rotating two of the partitions 210. When the silencer is placed vertically, from bottom to top, the partitions are a first partition 211, a second partition 210, and a third partition 213. In the above arrangement, the first partition 211 cannot rotate from the outside of the silencing cavity 100 because it does not have a rotating protrusion 230. Thus, the first partition 211, located at the bottom, can support the other partitions 210 above it. The porosity can be effectively adjusted by rotating the corresponding rotating protrusions 230 of the second partition 212 and the third partition 213.

[0059] Optionally, a positioning structure 120 is provided in the limiting groove 110, which is used to fix the rotating protrusion 230 in the limiting groove 110.

[0060] In this embodiment, the positioning structure 120 can temporarily fix the swivel protrusion 230 in the limiting groove 110, so that the developers can collect the noise value of the silencer at the current position after the partition 210 is rotated and the porosity is adjusted.

[0061] For example, the positioning structure 120 includes a plurality of flexible protrusions, which are provided on the limiting groove 110 along the extending direction of the limiting groove 110. The distance between adjacent flexible protrusions is adapted to the size of the rotating protrusion 230, so that the rotating protrusion 230 is clamped by adjacent flexible protrusions, and the flexible protrusions at both ends can clamp the rotating protrusion 230 with the two ends of the limiting groove 110 respectively. When the second partition 212 and the third partition 213 are provided with rotating protrusions 230, a set of flexible protrusions is provided above and below the limiting groove 110 respectively. The upper flexible protrusion is used to clamp the third partition 213, and the lower flexible protrusion is used to clamp the second partition 212.

[0062] In another example, the positioning structure 120 includes a plurality of flexible protrusions. The flexible protrusions are provided on the inner wall of the limiting groove 110 along the extending direction of the limiting groove 110, and the rotating protrusion 230 is provided with recesses corresponding to the flexible protrusions. During the movement of the rotating protrusion 230 within the limiting groove 110, the rotating protrusion 230 can be temporarily fixed when a certain flexible protrusion falls into the recess of the rotating protrusion 230.

[0063] Optionally, multiple silencing holes 220 are evenly arranged around the center of the partition 210. In this way, the rotation trajectory of the silencing holes 220 is circular.

[0064] Optionally, the silencing holes 220 on the same partition 210 form multiple sets of concentric circular tracks during rotation. Each set of silencing holes 220, when arranged around the center of the partition 210, forms a circular track. When multiple sets of silencing holes 220 are arranged around the center of the partition 210, multiple sets of concentric circular tracks can be formed. This layout of the silencing holes 220 is beneficial for adjusting the porosity and simplifies the testing time.

[0065] When the muffler is placed vertically, the first partition 211, the second partition 210, and the third partition 213 are arranged sequentially from bottom to top. The second partition 212 and the third partition 213 have swivel protrusions 230 extending from the limiting groove 110 on their sides, so that the porosity can be adjusted by rotating the second partition 212 and the third partition 213. Each of the first partition 211, the second partition 212, and the third partition 213 has two sets of muffler holes 220 arranged around the center of the partition 210. The ones closer to the center are called the inner circular trajectory, and the ones farther from the center are called the outer circular trajectory.

[0066] For example, all the silencing holes 220 are constructed as circular holes with the same cross-sectional area. The inner circular path of the first partition 211 is uniformly provided with six silencing holes 220, and the outer circular path is uniformly provided with six silencing holes 220, as shown below. Figure 3 As shown in (a); the inner circular path of the second partition 212 is uniformly provided with 6 sound-absorbing holes 220, and the outer circular path is uniformly provided with 12 sound-absorbing holes 220, as shown in (a). Figure 3 As shown in (b); the inner circular path of the third partition 213 is evenly provided with 12 sound-absorbing holes 220, and the outer circular path is evenly provided with 6 sound-absorbing holes 220, as shown in (b). Figure 3 As shown in (c), the staggered relationship between the sound-absorbing holes 220 on the inner and outer circular tracks of each partition 210 is as follows: Figure 3 As shown in (a)-3(c), in the above-mentioned layout of the silencing holes 220, the first partition 211, the second partition 212, and the third partition 213, when fully aligned, overlap to form six silencing holes 220 on the outer circular trajectory and six silencing holes 220 on the inner circular trajectory. At this point, the porosity is at its maximum, as shown in (a)-3(c). Figure 4As shown in (a). In the maximum alignment state, the second partition 212 rotates by an angle α, and after overlapping, it forms 6 silencing holes 220 on the outer circular trajectory and 0 silencing holes 220 on the inner circular trajectory, as shown in (a). Figure 4 As shown in (b). In the maximum alignment state, the third partition 213 rotates by an angle b, and after overlapping, forms 0 silencing holes 220 on the outer circular trajectory and 6 silencing holes 220 on the inner circular trajectory, as shown in (b). Figure 4 As shown in (c). Here, angles a and b are special angles. By rotating the second partition 212 and / or the third partition 213 to any other angle, different porosities can be formed by the superposition or blocking of the sound-absorbing holes 220 on the partition 210.

[0067] Optionally, the shape and cross-sectional area of ​​the silencing holes 220 on the same partition 210 may be the same or different, and the shape and cross-sectional area of ​​the silencing holes 220 on different partitions 210 may be the same or different.

[0068] For example, such as Figure 5 As shown, the partition 210 has strip holes with two different cross-sectional areas. The inner circular track is uniformly provided with 6 sound-absorbing holes 220 with smaller cross-sectional areas, and the outer circular track is uniformly provided with 6 sound-absorbing holes 220 with larger cross-sectional areas.

[0069] Optionally, a stop block 201 is provided at each end of the rotating shaft 200, and each stop block 201 abuts against the surface of the partition plate 210 at the corresponding end of the rotating shaft 200.

[0070] In this embodiment, the stop block 201 can make the surfaces of multiple partitions 210 fit tightly together, preventing the refrigerant in the first compartment 101 from flowing into the gap between adjacent partitions 210 when it flows to the second compartment 102 through the superimposed silencer hole 220.

[0071] This disclosure also provides an air conditioning system including the muffler described in any of the above embodiments.

[0072] This disclosure also provides a method for determining the porosity of the inner baffle of a muffler, including the muffler described in any of the above embodiments, the method comprising:

[0073] S01: Rotate one or more partitions 210 to maximize the porosity of all partitions 210 stacked together;

[0074] S02: Introduce refrigerant through the silencing inlet, continue to rotate the baffle 210 multiple times to adjust the porosity, and obtain the noise value of the silencing cavity 100 after each rotation;

[0075] S03: Determine the optimal porosity using multiple noise values.

[0076] In this embodiment, the porosity is first adjusted to the maximum, and then the partition 210 is rotated multiple times. The porosity of the partition 210 changes with each rotation. As the porosity changes, the noise reduction effect of the partition assembly also changes accordingly. At this time, the noise value of the noise reduction cavity after each rotation is recorded, and then the optimal porosity of the partition 210 is determined by multiple noise values.

[0077] Step S03, determining the optimal porosity through multiple noise values, includes: comparing the magnitudes of multiple noise values ​​and taking the porosity corresponding to the smallest noise value as the optimal porosity.

[0078] In this embodiment, since the noise value of the silencing cavity 100 is recorded after each adjustment of the porosity, the minimum noise value indicates that the current porosity has the best silencing effect on the air conditioning system. Therefore, the porosity corresponding to the minimum noise value is taken as the optimal porosity.

[0079] This disclosure also provides another method for determining the porosity of the internal baffle of a muffler, including:

[0080] S04: Determine the object to be rotated and the rotation angle based on the layout of the sound-absorbing holes 220 on the multiple partitions 210;

[0081] S01: Rotate one or more partitions 210 to maximize the porosity of all partitions 210 stacked together;

[0082] S02: Introduce refrigerant through the silencing inlet, continue to rotate the baffle 210 multiple times to adjust the porosity, and obtain the noise value of the silencing cavity 100 after each rotation;

[0083] S03: Determine the optimal porosity using multiple noise values.

[0084] In this embodiment, the baffle assembly includes multiple baffles 210. Which baffle 210 is rotated and the angle of rotation each time are related to the layout of the silencing holes 220 on the baffle 210. It should be noted that after rotation, at least one of the superimposed silencing holes 220 is open, thereby ensuring the normal flow of the pipeline after rotation.

[0085] For example, to more clearly illustrate the rotation process of the partition 210, the partition assembly is simplified to include two partitions 210, referred to as the fourth partition and the fifth partition, respectively. The fourth partition has only one set of six silencing holes 220 arranged around the center of the partition 210. All silencing holes 220 on the fourth partition are circular holes with the same cross-sectional area. The fifth partition is identical to the fourth partition. The fifth partition is located above the fourth partition and has a swivel protrusion 230. During testing, the developers rotated the fifth partition using the swivel protrusion 230 to adjust the porosity, rotating it 2° at a time, during which the porosity gradually decreased. Figure 6Therefore, the noise level of the silencing cavity was measured every 2° rotation, and the porosity was minimized on the 6th rotation. Comparing the six noise levels, the porosity corresponding to the lowest noise level was taken as the optimal porosity. It can be seen that the smaller the rotation angle, the smaller the porosity change, and the more noise level data obtained. Compared to replacing ordinary baffles with the muffler each time it is disassembled and reassembled, the optimal porosity obtained using the baffle assembly provided in this embodiment is more accurate.

[0086] After obtaining the optimal porosity for the best noise reduction effect of the air conditioning system, in the subsequent production stage, the optimal porosity can be directly applied to the ordinary baffles inside the silencer.

[0087] 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, include: Silencing cavity (100); A partition assembly, disposed within the silencing cavity (100), includes a rotating shaft (200) and multiple partitions (210); the surfaces of adjacent partitions (210) are in contact with each other, and the silencing cavity (100) is divided into a first chamber (101) and a second chamber (102); the first chamber (101) is provided with a silencing inlet, and the second chamber (102) is provided with a silencing outlet; the rotating shaft (200) passes through the center of the multiple partitions (210) so that the partitions (210) can rotate around the rotating shaft (200); Furthermore, each of the partitions (210) is provided with a plurality of sound-absorbing holes (220), and the rotation trajectories of the sound-absorbing holes (220) on adjacent partitions (210) overlap at least partially, thereby adjusting the porosity of all the partitions (210) after stacking by rotating one or more of the partitions (210).

2. The silencer according to claim 1, characterized in that, At least one of the partition plates (210) has a spiral protrusion (230) on its side; The silencing cavity (100) has a limiting groove (110) on its side, which corresponds to the swivel protrusion (230). The swivel protrusion (230) extends out of the silencing cavity (100) through the limiting groove (110). By moving the swivel protrusion (230) within the limiting groove (110), the partition plate (210) is driven to rotate.

3. The silencer according to claim 2, characterized in that, The spiral protrusion (230) is formed by protruding from the side of the partition (210).

4. The silencer according to claim 2 or 3, characterized in that, The limiting groove (110) is provided with a positioning structure (120), which is used to fix the swivel protrusion (230) in the limiting groove (110).

5. The silencer according to claim 2 or 3, characterized in that, The partition assembly includes three partitions (210), namely a first partition (211), a second partition (212) and a third partition (213); The sides of the first partition (211), the second partition (212) and the third partition (213) are all abutted against the inner wall of the silencing cavity (100); The second partition (212) and the third partition (213) are respectively provided with a spiral protrusion (230) on their sides, and both spiral protrusions (230) are located in the limiting groove (110).

6. The silencer according to any one of claims 1 to 3, characterized in that, The plurality of the silencing holes (220) are evenly arranged around the center of the partition (210).

7. The silencer according to claim 6, characterized in that, The sound-absorbing holes (220) on the same partition (210) form multiple sets of concentric circular trajectories when rotating.

8. A method for determining the porosity of a muffler inner diaphragm, characterized in that, Includes the silencer as described in any one of claims 1 to 7; The method includes: Rotate one or more of the partitions (210) to maximize the porosity of the stacked partitions (210); Refrigerant is introduced through the silencing inlet, and the porosity is adjusted by rotating the baffle (210) multiple times. The noise value of the silencing cavity (100) is obtained after each rotation. The optimal porosity is determined by using multiple noise values.

9. The method according to claim 8, characterized in that, The method of determining the optimal porosity through multiple noise values ​​includes: Compare the magnitudes of multiple noise values ​​and select the porosity corresponding to the lowest noise value as the optimal porosity.

10. An air conditioning system, characterized in that, Includes the silencer as described in any one of claims 1 to 7.

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