Silencing device, compressor and electric appliance

Abstract

This invention provides a silencing device, a compressor, and an electrical appliance. The silencing device includes a main structure and a silencing pipe. The main structure has an airflow inlet and an airflow outlet, and a silencing cavity is provided within the housing. The silencing pipe has silencing holes in its wall. There are at least two silencing cavities, with the airflow inlet, at least two silencing cavities, and the airflow outlet sequentially connected. The airflow inlet is connected to the silencing cavity via a silencing pipe, and the silencing cavities are connected to each other via another silencing pipe. At least one silencing cavity is designated as a Class I cavity, connected to the silencing pipe only through silencing holes. At least one silencing cavity is designated as a Class II cavity, connected to the silencing pipe only through the pipe opening of the silencing pipe. The compressor includes the aforementioned silencing device. The electrical appliance includes the aforementioned compressor. This invention sets up Class I and Class II cavities with different silencing effects, optimizes the internal flow channel design, more effectively attenuates exhaust airflow noise, and significantly reduces the overall noise level of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically to a noise reduction device, compressor, and electrical components for improving noise reduction. Background Technology

[0002] A silencing device for a scroll compressor is provided, comprising a housing and a high-pressure air silencer. The housing contains a motor space, a support plate space, a pump body space, and a large air storage space arranged sequentially along the axial direction. A smaller silencing chamber is also provided within the housing. The silencing chamber and the air storage space are located at the same axial position and are separated by a partition and connected by a through-hole in the partition. The housing has a gas inlet and an outlet. The inlet connects to the pump body space in a direction perpendicular to the axial direction. The smaller silencing chamber is used to install the high-pressure air silencer, which is located within the silencing chamber, with its silencing pipe connected at opposite ends to the through-hole in the partition and the outlet, respectively.

[0003] However, existing silencers, which simply incorporate a large air storage space into the casing of a scroll compressor, still have poor noise reduction performance. Summary of the Invention

[0004] The first objective of this invention is to provide a noise reduction device for a compressor that improves noise reduction performance.

[0005] A second objective of the present invention is to provide a compressor with lower noise levels.

[0006] A third objective of this invention is to provide an electrical appliance with lower noise levels.

[0007] The silencing device provided by the first objective of this invention includes a main body and a silencing pipe. The main body is provided with an airflow inlet and an airflow outlet, and a silencing cavity is provided inside the shell. The wall of the silencing pipe is provided with silencing holes. The number of silencing cavities is at least two. The airflow inlet, at least two silencing cavities and the airflow outlet are connected in sequence. The airflow inlet and the silencing cavity are connected through a silencing pipe, and the silencing cavities are connected to each other through another silencing pipe. At least one silencing cavity is designated as a first-class cavity, and the first-class cavity is connected to the pipe of the silencing pipe only through a silencing hole. At least one silencing cavity is designated as a second-class cavity, and the second-class cavity is connected to the pipe of the silencing pipe only through the pipe opening of the silencing pipe.

[0008] As can be seen from the above scheme, the main feature of the silencing device of the present invention is that it is equipped with two different types and functions of silencing chambers. When the compressed gas is discharged from the pump assembly and enters the airflow inlet of the silencing device of the present invention, under the action of air pressure, the noise will enter the first type of chamber through the silencing hole. Since the first type of chamber does not have an outlet such as a pipe, the noise wave will bounce back and forth like ripples in the first type of chamber and gradually lose energy. Furthermore, when the other part of the noise is sent to the second type of chamber, the two noise waves with a time difference are superimposed in the second type of chamber and cancel each other out. Therefore, by combining the first type of chamber and the second type of chamber, the internal flow channel design is optimized on the basis of the original expansion silencing, which more effectively attenuates the exhaust airflow noise and significantly reduces the overall noise level of the compressor.

[0009] A further proposed solution is to designate a silencer chamber directly connected to the airflow outlet as a Class II chamber.

[0010] As can be seen from the above, the first type of cavity mainly filters noise. If the silencer cavity is directly connected to the airflow outlet, choosing the first type of cavity will weaken the silencer effect. In addition, the silencer cavity connected to the airflow outlet needs to consider the airflow rate and airflow stability. The input channel of the first type of cavity is a silencer hole. In comparison, the input channel of the second type of cavity is a silencer pipe with a larger cross-section. This setting is more conducive to meeting the design requirements.

[0011] A further proposed solution is to have at least three silencing cavities, including at least two Class II cavities, with the two Class II cavities sequentially connected between the airflow inlet and the airflow outlet, and at least one silencing pipe connected between the two Class II cavities connected to a Class I cavity through its own silencing hole.

[0012] As can be seen from the above, under this setting, at least two Class II cavities are used for noise reduction, which is more conducive to the noise reduction effect.

[0013] A further proposed solution is to have three silencing chambers; the silencing pipe connecting the airflow inlet and the first Class II chamber is connected to the Class I chamber through its own silencing hole, and the silencing pipe connecting the two Class II chambers is connected to the Class I chamber through its own silencing hole.

[0014] As can be seen from the above, more silencing cavities also meet the design principles of this invention. However, the design of the silencing device needs to consider cost, assembly difficulty, and the feasibility of the internal space of the compressor. The combination of two Class II cavities and one Class I cavity has a better silencing effect, does not occupy a large height, and is relatively simple to assemble. Considering all these factors, it is a more reasonable choice.

[0015] A further proposed solution is to place a Class I cavity between two Class II cavities, with the silencer pipe connecting the airflow inlet to the first Class II cavity and the silencer pipe connecting the two Class II cavities both passing through the Class I cavity.

[0016] As can be seen from the above, setting a Class I cavity between two or more Class II cavities is the key to ensuring that multiple silencers connected to different locations pass through the Class I cavity as much as possible and to make the best use of the silencer holes to cooperate with the Class I cavity in order to improve the silencer effect.

[0017] Another further option is that the number of silencing cavities is odd, with the airflow inlet, one or more Class II cavities, and the airflow outlet connected in sequence; or, the number of silencing cavities is even, with at least one Class I cavity connected between the airflow inlet and the airflow outlet.

[0018] As can be seen from the above, under this design principle, the design requirement of using both Class I and Class II cavities for silencing can be met regardless of the number of silencing cavities.

[0019] Another further option is that the silencer tube connecting the airflow inlet and the first Class II cavity is located in the center of the silencer device, while the remaining silencer tubes are located on the outer periphery of the silencer tube located in the center of the silencer device, and / or the cross-sectional area of ​​the silencer tube connecting the airflow inlet and the first Class II cavity is larger than the cross-sectional area of ​​the remaining silencer tubes.

[0020] As can be seen from the above, under this configuration, the inlet of the central silencer pipe, i.e. the airflow inlet of the silencer device, can be directly opposite the exhaust port of the vortex pump body assembly, and the cross-sectional area of ​​the central silencer pipe is larger to meet the input requirements of high-pressure gas.

[0021] Another further approach is to arrange multiple silencing chambers sequentially along the height of the silencing device.

[0022] As can be seen from the above, this setting can better ensure that each silencing cavity, including both Class I and Class II cavities, has sufficient space to guarantee its silencing effect.

[0023] A further proposed solution is to position the airflow inlet at the bottom of the silencer in the vertical direction, with the silencer cavity directly connected to the airflow outlet closer to the bottom than other silencer cavities.

[0024] As can be seen from the above, this configuration ensures that the positions of the airflow inlet and outlet meet the matching requirements of most existing scroll compressors. Furthermore, with this configuration, multiple silencers are arranged sequentially along the height direction of the silencer device, achieving the requirement of inserting and installing the silencer pipes in a compact structure, thereby forming the required Class I and Class II cavities.

[0025] The compressor provided by the second objective of this invention includes the above-mentioned silencer.

[0026] The electrical appliance provided by the third objective of this invention includes the compressor described above. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the first embodiment of the silencing device of the present invention and the pump body casing.

[0028] Figure 2 This is a cross-sectional view along the height direction of the first embodiment of the silencing device of the present invention.

[0029] Figure 3 This is a structural diagram of the first silencer pipe in the first embodiment of the silencer device of the present invention.

[0030] Figure 4 This is a structural diagram of the second silencer pipe in the first embodiment of the silencer device of the present invention.

[0031] Figure 5 This is a schematic diagram of the airflow path in the first embodiment of the silencing device of the present invention.

[0032] Figure 6 This is a schematic diagram of the silencing principle of a cavity in the first embodiment of the silencing device of the present invention.

[0033] Figure 7 This is a schematic diagram of the silencing principle of the second type of cavity in the first embodiment of the silencing device of the present invention.

[0034] Figure 8 This is a cross-sectional view of the second embodiment of the silencing device of the present invention and the pump body casing.

[0035] Figure 9 This is a schematic diagram of the airflow path in the second embodiment of the silencing device of the present invention.

[0036] Figure 10 This is a schematic diagram of the airflow path in the third embodiment of the silencing device of the present invention.

[0037] Figure 11 This is a schematic diagram of the airflow path in the fourth embodiment of the silencing device of the present invention. Detailed Implementation

[0038] First embodiment of silencer, compressor and electrical components See Figure 1 In this embodiment, the electrical components include a compressor, which is a scroll compressor. The compressor includes a pump body assembly, a pump body housing 9, and a silencer. The pump body assembly is implemented using existing technology. The pump body housing 9 has a pump body position 90 inside, an inlet 901 on the outer periphery of the pump body housing 9, and an outlet 909 at the top center of the pump body 90 corresponding to the exhaust port of the pump body assembly. The outlet 909 is set upwards.

[0039] The silencing device of this embodiment includes a main body 1 and a silencing pipe. The main body 1 includes a silencing shell 11 and a partition 15 disposed inside the silencing shell 11. The silencing shell 11 also serves as the upper cover of the pump body shell 9.

[0040] The inner and outer contours of the muffler housing 11 are both cylindrical, and the center line of the cylinder, the axial direction of the crankshaft that drives the pump assembly, the height direction of the compressor, and the height direction of the muffler are all consistent.

[0041] The partition 15 is perpendicular to the height direction of the silencing device. The two partitions 15 are set inside the silencing housing 11 so that the internal space of the silencing housing 11 is divided into three silencing chambers arranged sequentially along the height direction of the silencing device. The three silencing chambers are the first silencing chamber 12, the second silencing chamber 13, and the third silencing chamber 14, which are arranged sequentially from bottom to top.

[0042] The partition 15 is provided with through holes, so that the silencer pipe can be inserted through the partition 15 and connected between different silencer cavities.

[0043] See Figure 3 and Figure 4 In this embodiment, the multiple silencers include one first silencer 21 and three second silencers 22. The cross-sectional area of ​​the first silencer 21 is larger than that of the second silencers 22, and the first silencer 21 is longer than the second silencers 22. Furthermore, both types of silencers have silencer holes on their walls, but the first silencer hole 213 of the first silencer 21 is only located in its upper half, while the second silencer holes 223 of the second silencers 22 are distributed along their length.

[0044] Combined Figure 1 and Figure 2 The first silencer pipe 21 is located in the center of the main structure 1 and extends along the height direction, passing upward through the second silencer cavity 13 and the third silencer cavity 14 before entering the first silencer cavity 12. In this embodiment, the lower end of the first silencer pipe 21 serves as the airflow inlet 101 of the silencer device; that is, the opening of the first silencer pipe 21 is connected to the airflow inlet 101, which is located at the bottom center of the silencer device and faces downwards. The lower end of the first silencer pipe 21, as the airflow inlet 101, connects to the outlet 909.

[0045] In addition, the first port 212 at the upper end of the first silencer pipe 21 is connected to the first silencer cavity 12, and the first silencer hole 213 on the upper section of the first silencer pipe 21 is located only in the third silencer cavity 14.

[0046] In addition, three second silencer pipes 22 are arranged around the first silencer pipe 21 located in the center, and the second silencer pipes 22 extend between the first silencer cavity 12 and the second silencer cavity 13 and pass through the third silencer cavity 14. The second pipe port 221 at the upper end of the second silencer pipe 22 is connected to the first silencer cavity 12, the third pipe port 222 at the lower end of the second silencer pipe 22 is connected to the second silencer cavity 13, and the second silencer hole 223 on the pipe wall of the second silencer pipe 22 is located only in the third silencer cavity 14.

[0047] In addition, the silencing housing 11 is provided with an airflow outlet 109 for the silencing device. In this embodiment, the airflow outlet 109 is directly connected to the outer periphery of the second silencing cavity 13, which is located closest to the bottom of the silencing device among the multiple silencing cavities. Furthermore, since the silencing housing 11 serves as the upper cover of the pump housing 9 and is combined with the pump housing 9 to form a complete housing assembly, in this configuration, the inlet 901 serves as the main air inlet of the pump assembly, and the airflow outlet 109 serves as the main air outlet of the pump assembly.

[0048] See Figure 5 The schematic diagram shows that the airflow flows in the silencer device along routes a1 and a2. In route a1, the airflow entering through the air inlet enters from one end of the silencer pipe and exits from the other end to the first silencer chamber 12 (Class II chamber), and part of the airflow passes through the silencer hole to the third silencer chamber 14 (Class I chamber). In route a2, the airflow in the first silencer chamber 12 enters from one end of another silencer pipe and exits from the other end to the second silencer chamber 13 (Class II chamber), and part of the airflow passes through the silencer hole to the third silencer chamber 14 (Class I chamber).

[0049] In this configuration, the pipes of the first silencing cavity 12 and the first silencing pipe 21 are connected only through the first pipe port 212, and the pipes of the first silencing cavity 12 and the second silencing pipe 22 are connected only through the second pipe port 221. Therefore, the first silencing cavity 12 is in accordance with the principle that the pipes of the silencing pipe are connected only through the pipe port of the silencing pipe, and thus serves as the second type of cavity of the present invention.

[0050] Similarly, the second silencing cavity 13 is not connected to the pipe of the first silencing pipe 21, and the pipe of the second silencing cavity 13 is only connected to the pipe of the second silencing pipe 22 through the third pipe port 222. Therefore, the second silencing cavity 13 is consistent with the pipe of the silencing pipe being only connected through the pipe port of the silencing pipe. The second silencing cavity 13 is the second type of cavity of the present invention.

[0051] The third silencing cavity 14 is connected to the pipe of the first silencing pipe 21 only through the first silencing hole 213, and the third silencing cavity 14 is connected to the pipe of the second silencing pipe 22 only through the second silencing hole 223. Therefore, the third silencing cavity 14 is consistent with the pipe of the silencing pipe being connected only through the silencing hole, and the third silencing cavity 14 is a type of cavity of the present invention.

[0052] Furthermore, in this embodiment, the airflow inlet 101, the first silencer pipe 21, the first silencer cavity 12, the second silencer pipe 22, the second silencer cavity 13, and the airflow outlet 109 are sequentially connected. Therefore, this embodiment conforms to the requirement that the number of silencer cavities is at least two, the airflow inlet, at least two silencer cavities, and the airflow outlet are sequentially connected, the airflow inlet and the silencer cavity are connected through a silencer pipe, and the silencer cavities are connected to each other through another silencer pipe; at least one silencer cavity is designated as a Class I cavity, and the Class I cavity is connected to the silencer pipe only through a silencer hole; at least one silencer cavity is designated as a Class II cavity, and the Class II cavity is connected to the silencer pipe only through the silencer pipe opening.

[0053] Furthermore, in this embodiment, the second silencing cavity 13, which is directly connected to the airflow outlet 109, is designated as a Class II cavity. Furthermore, in this embodiment, the number of silencing cavities is at least three and includes at least two Class II cavities. The at least two Class II cavities are sequentially connected between the airflow inlet and the airflow outlet, and at least one silencing pipe connected between the two Class II cavities is connected to a Class I cavity through its own silencing hole.

[0054] Furthermore, in this embodiment, the number of silencing cavities is three. The first silencing pipe 21, which connects the airflow inlet 101 and the first silencing cavity 12 (which is a type II cavity), is connected to the third silencing cavity 14 (which is a type I cavity) through its own first silencing hole 213. The second silencing pipe 22, which connects the two type II cavities, the first silencing cavity 12 and the second silencing cavity 13, is connected to the third silencing cavity 14 (which is a type I cavity) through its own second silencing hole 223.

[0055] Furthermore, in this embodiment, the number of silencing cavities is odd, and the airflow inlet, one or more Class II cavities, and the airflow outlet are connected in sequence.

[0056] See Figure 6 When compressed gas is discharged from the pump assembly and enters the silencing device of the present invention, under the action of air pressure, noise will enter the third silencing cavity 14, which is a type of cavity, through the first silencing hole 213 of the first silencing pipe 21 and the second silencing hole 223 of the second silencing pipe 22. Since the type of cavity does not have inlet or outlet such as pipe opening, the noise wave will bounce back and forth in the type of cavity like ripples and gradually lose energy.

[0057] See Figure 7 When compressed gas is discharged from the pump assembly and enters the silencing device of the present invention, the airflow enters and exits the first silencing chamber 12 through the first port 221 and the second port 212, and enters the second silencing chamber 13 only through the third port 222. When the noise is sent to the second type of cavity of the first silencing chamber 12 or the second silencing chamber 13, the two noise sound waves with a time difference in the first silencing chamber 12 or the second silencing chamber 13 are superimposed in the second type of cavity and cancel each other out.

[0058] Mainly, the silencing device of the present invention is provided with two different types and functions of silencing chambers. By combining the first type of chamber and the second type of chamber, the internal flow channel design is optimized on the basis of the original expansion silencing, which not only more effectively attenuates the noise of exhaust airflow, but also significantly reduces the overall noise level of the compressor.

[0059] Second embodiment of silencer, compressor and electrical components See Figure 8 This embodiment includes only two silencing chambers arranged sequentially along the height direction—a first silencing chamber 31 and a second silencing chamber 32. The port 331 of the first silencing pipe 33 is connected to the airflow inlet of the silencing device. The first silencing pipe 33 passes through the first silencing chamber 31 and reaches the second silencing chamber 32. The first silencing pipe 33 is not connected to the first silencing chamber 31. The second silencing chamber 32 and the pipe of the first silencing pipe 33 are connected only through the first silencing hole 333 on the first silencing pipe 33. That is, the other port of the first silencing pipe 33 is not connected to the second silencing chamber 32. The second silencing pipe 34 is placed in the second silencing chamber 32. The pipe of the second silencing chamber 32 and the pipe of the second silencing pipe 34 are connected only through the second silencing hole 343 on the second silencing pipe 34. The pipe of the first silencing chamber 31 and the pipe of the second silencing pipe 34 are connected only through the port at the lower end of the second silencing pipe 34.

[0060] It can be seen that the second silencing cavity 32 is a Class I cavity while the first silencing cavity 31 is a Class II cavity.

[0061] Combination Figure 9 The airflow flows in the silencer device along routes a1 and a2. In route a1, the airflow enters the mouth of the silencer pipe through the airflow inlet at the bottom of the silencer device and is sent out through the silencer hole of the silencer pipe to the second silencer chamber 32, which is a first-class chamber. In route a2, the airflow in the second silencer chamber 32 is sent into the pipe through the silencer hole of another silencer pipe and is sent out through the mouth of the silencer pipe to the first silencer chamber 31, which is a second-class chamber.

[0062] In this configuration, there are two silencing cavities, including one Class I cavity and one Class II cavity, with the Class II cavity being the one connected to the airflow outlet.

[0063] In addition, this setup meets the following requirements: the number of silencing cavities is even, and the airflow inlet, a portion of the Class II cavities, the Class I cavities, another portion of the Class II cavities, and the airflow outlet are connected in sequence.

[0064] Setting only two silencing cavities simplifies the structure and reduces the cost of the silencing device. Design requirements can be met by adding more silencing tubes, and silencing material can be placed inside the silencing tubes to increase acoustic impedance and enhance the silencing effect.

[0065] Third embodiment of silencer, compressor and electrical components See Figure 10 In this embodiment, a fourth silencing cavity 54, a third silencing cavity 53, a second silencing cavity 52 and a first silencing cavity 51 are arranged sequentially along the height direction of the silencing device. Among them, the fourth silencing cavity 54, the second silencing cavity 52 and the first silencing cavity 51 are all Class II cavities, and the third silencing cavity 53 is a Class I cavity.

[0066] The airflow flows sequentially from route a1 to route a4 within the silencer. In routes a1 to a2, the airflow enters and exits between the airflow inlet and the Class II cavity through the corresponding silencer pipe inlet, or between Class II cavities through the corresponding silencer pipe inlet. The silencer pipe passes through the third silencer cavity 53, which is a Class I cavity, and delivers the airflow to the third silencer cavity 53 through the silencer hole. In route a3, the airflow from the Class II cavity enters the silencer pipe from the pipe inlet and exits only through the silencer hole of the silencer pipe to the third silencer cavity 53, which is a Class I cavity. In route a4, the airflow in the third silencer cavity 53 is delivered into the silencer pipe through the silencer hole and finally exits only through the pipe inlet of the silencer pipe to the final Class II cavity—the fourth silencer cavity 54, and finally exits from the airflow outlet of the silencer.

[0067] The embodiment has at least three silencing cavities and includes at least two Class II cavities. The at least two Class II cavities are sequentially connected between the airflow inlet and the airflow outlet, and at least one silencing pipe connecting the two Class II cavities is connected to a Class I cavity through its own silencing hole.

[0068] In this embodiment, the number of silencing cavities is even, and the airflow inlet, a portion of the Class II cavity, a Class I cavity, another portion of the Class II cavity, and the airflow outlet are connected in sequence.

[0069] Fourth embodiment of silencer, compressor and electrical appliances See Figure 11 In this embodiment, a fourth silencing cavity 64, a second silencing cavity 62, a fifth silencing cavity 65, a third silencing cavity 63, and a first silencing cavity 61 are arranged sequentially along the height direction of the silencing device. Among them, the fourth silencing cavity 64, the second silencing cavity 62, the third silencing cavity 63, and the first silencing cavity 61 are all Class II cavities, and the fifth silencing cavity 65 is a Class I cavity.

[0070] The airflow flows sequentially from route a1 to route a4 within the silencer. In each route from route a1 to route a4, the airflow enters and exits between the airflow inlet and the Class II cavity through the corresponding silencer pipe opening, or enters and exits between Class II cavities through the corresponding silencer pipe opening. Furthermore, the silencer pipe passes through the fifth silencer cavity 65, which is a Class I cavity, and delivers the airflow to the fifth silencer cavity 65 through the silencer hole.

[0071] In this embodiment, the number of silencing cavities is at least three and includes at least two Class II cavities. The at least two Class II cavities are sequentially connected between the airflow inlet and the airflow outlet, and at least one silencing pipe connecting the two Class II cavities is connected to a Class I cavity through its own silencing hole.

[0072] Furthermore, the fifth silencing cavity 65 is not connected between the airflow inlet and the airflow outlet. That is, in this embodiment, the number of silencing cavities is odd, and the airflow inlet, one or more Class II cavities and the airflow outlet are connected in sequence.

[0073] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silencing device, comprising a main body and a silencing pipe, wherein the main body is provided with an airflow inlet and an airflow outlet, and the housing is provided with a silencing cavity; Its features are: The wall of the silencer pipe is provided with silencer holes; The number of silencers is at least two, the airflow inlet, at least two silencers and the airflow outlet are connected in sequence, the airflow inlet and the silencer are connected by the silencer pipe, and the silencers are connected to each other by another silencer pipe; At least one of the silencing cavities is configured as a type of cavity, and the type of cavity is connected to the silencing pipe only through the silencing hole; At least one of the silencing cavities is configured as a type II cavity, and the type II cavity is connected to the silencing pipe only through the pipe opening of the silencing pipe.

2. The silencing device according to claim 1, characterized in that: The silencing cavity that is directly connected to the airflow outlet is designated as the second type of cavity.

3. The silencing device according to claim 2, characterized in that: The number of silencing cavities is at least three and includes at least two of the second-class cavities. At least two of the second-class cavities are sequentially connected between the airflow inlet and the airflow outlet, and at least one of the silencing pipes connecting the two second-class cavities is connected to the first-class cavity through its own silencing hole.

4. The silencing device according to claim 3, characterized in that: The number of silencing cavities is three; The silencer pipe connecting the airflow inlet and the first type II cavity is connected to the type I cavity through its own silencer hole, and the silencer pipe connecting the two type II cavities is connected to the type I cavity through its own silencer hole.

5. The silencing device according to claim 4, characterized in that: The first type of cavity is disposed between the two second type of cavities. The silencer pipe connecting the airflow inlet and the first second type of cavity passes through the first type of cavity, and the silencer pipe connecting the two second type of cavities passes through the first type of cavity.

6. The silencing device according to claim 2, characterized in that: The number of the silencing cavities is odd, and the airflow inlet, one or more of the second-class cavities, and the airflow outlet are connected in sequence; or, The number of the silencing cavities is even, and at least one of the first-class cavities is connected between the airflow inlet and the airflow outlet.

7. The silencing device according to any one of claims 1 to 6, characterized in that: A silencer pipe connecting the airflow inlet and the first Class II cavity is located in the center of the silencer device, while the remaining silencer pipes are located on the outer periphery of the silencer pipe located in the center of the silencer device. And / or, The cross-sectional area of ​​the silencer tube connecting the airflow inlet and the first type II cavity is larger than the cross-sectional area of ​​the other silencers tubes.

8. The silencing device according to any one of claims 1 to 6, characterized in that: The plurality of the silencing chambers are arranged sequentially along the height direction of the silencing device.

9. The silencing device according to claim 8, characterized in that: In the vertical direction, the airflow inlet is located at the bottom of the silencer, and the silencer cavity that is directly connected to the airflow outlet is closer to the bottom than the other silencer cavities.

10. A compressor, characterized in that, Includes the silencing device described in any one of claims 1 to 9.

11. An electrical appliance, characterized in that, Includes the compressor described in claim 10 above.

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