Silencer, compressor assembly and air conditioner

Abstract

The invention provides a silencer, a compressor assembly and an air conditioner, the silencer is provided with a silencing channel, the two ends of the silencing channel in the circulation direction are an inlet end and an outlet end respectively, and a plurality of resonant cavities and a plurality of silencing ring chambers are distributed between the inlet end and the outlet end on the periphery of the silencing channel. The multiple silencing ring chambers and the multiple resonant cavities are alternately arranged in the circulation direction of the silencing channel, ring through holes communicating with the resonant cavities are formed in the end faces, close to the inlet end, of the silencing ring chambers, outer through holes are formed in the peripheral faces of the silencing ring chambers, and outer ring cavities are formed among the peripheries of the silencing ring chambers. An opening and closing control mechanism is arranged at the position, between every two adjacent silencing ring chambers, of the outer ring cavity, and the outer ring cavities corresponding to the two adjacent silencing ring chambers can be communicated or disconnected through the opening and closing control mechanisms. The silencer can adapt to different frequency bands to adjust a better silencing path, so that the silencing frequency band is widened, the silencing effect at different frequency bands is better, the silencing effect is improved, and the comfort experience of a user is improved.

Description

Technical Field

[0001] This invention relates to the field of noise reduction equipment technology, and in particular to a silencer, a compressor assembly having the silencer, and an air conditioner having the compressor assembly. Background Technology

[0002] As one of the vibration sources in an air conditioner, the compressor's vibrations during operation can induce mechanical resonance in other components such as pipes, supports, casing, and refrigerant tanks, radiating noise outwards. The vibration noise generated by the compressor, located in the outdoor unit, is transmitted to the indoor unit via the refrigerant piping, causing abnormal noises and affecting the user experience. To reduce the vibration noise from the refrigerant piping to the indoor unit, a silencer is added to the refrigerant piping on the compressor side.

[0003] A muffler includes a muffler tube, with one end being an air inlet and the other end being an air outlet. A first resonant cavity, a second resonant cavity, a third resonant cavity, and a fourth resonant cavity are formed on the muffler tube, arranged sequentially from the air inlet to the air outlet. The sections of the muffler tube located at both ends of the second resonant cavity extend at least partially into the second resonant cavity. Furthermore, the extension length of the muffler tube section located between the second and first resonant cavities within the second resonant cavity is a first length, and the extension length of the muffler tube section located between the second and third resonant cavities within the second resonant cavity is a second length. The first length is greater than the second length, which is beneficial for improving the muffler's noise reduction in the mid-to-low frequency range.

[0004] However, while the existing silencers are more effective at reducing noise in the low-to-mid frequency range, when the compressor's operating frequency increases and the refrigerant flow rate inside the refrigerant pipeline increases, resulting in higher transmitted noise, the existing silencers are less effective at reducing noise in the high-frequency range. Thus, the noise reduction frequency band of the existing silencers is limited, especially in the high-frequency range. Summary of the Invention

[0005] To achieve the first objective of this invention, this invention provides a silencer that can adaptively adjust the optimal noise reduction path for different frequency bands, thereby widening the noise reduction frequency band and improving the noise reduction effect in different frequency bands, thus enhancing the noise reduction effect and improving the user's comfort experience.

[0006] To achieve the second objective of the present invention, the present invention provides a compressor assembly having the above-described muffler.

[0007] To achieve the third objective of the present invention, the present invention provides an air conditioner having the above-described compressor assembly.

[0008] To achieve the first objective of this invention, a silencer is provided, comprising a silencing channel with an inlet end and an outlet end at its two ends in the flow direction. Multiple resonant cavities communicating with the silencing channel are arranged on the outer periphery of the silencing channel between the inlet end and the outlet end. Multiple silencing annular chambers are also arranged on the outer periphery of the silencing channel between the inlet end and the outlet end. These annular chambers and resonant cavities are alternately arranged in the flow direction of the silencing channel. Each annular chamber has an annular through-hole communicating with the resonant cavity on its end face near the inlet end, and an external through-hole on its outer periphery. An outer annular cavity is provided between the outer peripheries of the multiple annular chambers. An opening and closing control mechanism is provided at the outer annular cavity between two adjacent annular chambers, enabling the outer annular cavities corresponding to two adjacent annular chambers to connect or disconnect.

[0009] A further embodiment is that each opening and closing control mechanism includes a ring baffle and a control valve. A ring baffle is set in the outer ring cavity between two adjacent silencing ring chambers, and the ring baffle is provided with a valve. The control valve is set at the valve and controls the valve to open or close, so that the outer ring cavities corresponding to the two adjacent silencing ring chambers are connected or disconnected.

[0010] A further option is that the control valve is equipped with a sensor, or a sensor is installed in the outer ring cavity where the control valve is located, the sensor being used to detect at least one parameter among the fluid flow rate and fluid noise in the outer ring cavity; and / or, the control valve is a solenoid valve.

[0011] A further design is that the outer ring cavity includes multiple large-diameter cavity segments and multiple small-diameter cavity segments. One large-diameter cavity segment is set with a corresponding anechoic chamber, and one small-diameter cavity segment is set with a corresponding resonant cavity. An opening and closing control mechanism is set at one of the small-diameter cavity segments.

[0012] A further design involves installing a resonant ring plate within each silencing ring chamber to divide it into a first chamber and a second chamber. The first and second chambers are arranged side-by-side in the flow direction of the silencing channel, and the resonant ring plate has a through hole. Each silencing ring chamber has multiple external through holes on its outer circumferential surface. The first chamber is connected to the outer ring cavity through a portion of the external through holes, and the second chamber is connected to the outer ring cavity through another portion of the external through holes.

[0013] A further approach is to have the diameter of the through holes in the multiple resonant ring plates gradually decrease from the inlet end to the outlet end.

[0014] A further design involves providing a flow guide ring protruding from the end face of each resonant ring plate away from the inlet end, surrounding the through hole.

[0015] A further design includes a silencer comprising multiple I-shaped sleeves, multiple ring plates, and multiple ring sleeves. The bushing holes of the I-shaped sleeves form a silencing channel. The first end wall plate of the I-shaped sleeve is connected to the adjacent ring plate to form a resonant cavity. An annular through hole is formed between the second end wall plate of the I-shaped sleeve and the ring plate. A ring sleeve is located between the first end wall plate of an I-shaped sleeve and a ring plate. A silencing annular chamber is formed between the ring sleeves, the I-shaped sleeves, and the ring plates. Each ring sleeve has an external through hole.

[0016] A further option is that the muffler also includes an outer cover, which is fitted between the outer peripheries of multiple rings and forms an outer annular cavity between the multiple rings.

[0017] A further embodiment is that the muffler also includes an inlet end cover, which includes a first tube sleeve and a first expansion sleeve that are connected to each other. The end of the first tube sleeve away from the first expansion sleeve is the inlet end. The end of the first expansion sleeve away from the first tube sleeve is covered on the end face of the outer cover sleeve near the inlet end to form a resonant cavity near the inlet end. Alternatively, the end of the first expansion sleeve away from the first tube sleeve is covered on an annular plate near the inlet end to form a resonant cavity near the inlet end.

[0018] A further embodiment is that the muffler also includes an outlet cover, which includes a second tube sleeve and a second expansion sleeve that are connected to each other. The end of the second tube sleeve away from the second expansion sleeve is the outlet end. The end of the second expansion sleeve away from the second tube sleeve is covered on the end face of the outer cover sleeve near the outlet end to form a resonant cavity near the outlet end. Alternatively, the end of the second expansion sleeve away from the second tube sleeve is covered on the first end wall plate of the I-shaped sleeve near the outlet end to form a resonant cavity near the outlet end.

[0019] To achieve the second objective of the present invention, the present invention provides a compressor assembly, including a compressor and a muffler, wherein the outlet pipe of the compressor is connected to the inlet end of the muffler, and the muffler is the aforementioned muffler.

[0020] To achieve the third objective of the present invention, the present invention provides an air conditioner including a compressor assembly, wherein the compressor assembly is the compressor assembly described above.

[0021] The outlet pipe of the compressor of the present invention is connected to the inlet end of the silencer of the present invention, and the outlet end of the silencer of the present invention is connected to the indoor unit of the air conditioner through a connecting pipe, so that the refrigerant fluid discharged by the compressor enters the silencer's silencing channel from the inlet end of the silencer. Because the silencer of this invention has multiple resonant cavities arranged around its silencing channel between the inlet and outlet ends, the refrigerant fluid in the silencing channel can periodically flow into these resonant cavities for silencing. Furthermore, the silencer also has multiple silencing ring chambers arranged around its silencing channel between the inlet and outlet ends. These ring chambers and resonant cavities are alternately arranged in the flow direction of the silencing channel. Each ring chamber has an annular through-hole near its inlet end face that communicates with the resonant cavity, allowing the refrigerant fluid in each resonant cavity to periodically flow into each ring chamber for further silencing. Additionally, an outer ring cavity is provided between the outer peripheries of the multiple ring chambers, and each ring chamber has an external through-hole on its outer periphery, allowing the refrigerant fluid in each ring chamber to flow into the outer ring cavity for further silencing. This achieves multi-level, periodic Bragg bandgap principle silencing for the fluid medium entering the silencer, broadening the silencing frequency band and improving the silencing effect.

[0022] When the noise of the fluid medium is in the low-to-mid frequency range, that is, when the flow rate of the refrigerant fluid discharged by the compressor is not large and the fluid noise is not large, the control mechanism is activated to disconnect the outer ring cavity corresponding to the two adjacent silencer ring chambers, so that each silencer ring chamber is separated from each other, thereby making the silencer of the present invention more effective in the low-to-mid frequency range.

[0023] When the noise of the fluid medium is in the high-frequency range, that is, when the flow rate of the refrigerant fluid discharged from the compressor increases, thus increasing the fluid noise, the control mechanism is activated to connect the outer ring cavities corresponding to the two adjacent silencing ring chambers. This allows some of the fluid medium in the front silencing ring chamber to propagate through the outer ring cavity to the rear silencing ring chamber next to it. The fluid medium in the rear silencing ring chamber is out of phase with the fluid medium in the front silencing ring chamber. When the two fluid media with out of phase meet, they interfere and cancel each other out, further reducing noise. This results in a better noise reduction effect for the silencer of this invention in the high-frequency range. Furthermore, the number of opening and closing control mechanisms can be selectively adjusted, and the opening degree of the opening and closing control mechanisms can also be selectively adjusted, thereby widening the high-frequency noise reduction range and thus broadening the silencing frequency band.

[0024] Therefore, the silencer of the present invention can adaptively adjust the optimal noise reduction path for different frequency bands, thereby widening the noise reduction frequency band and making the noise reduction effect better in different frequency bands, thereby improving the noise reduction effect and enhancing the user's comfort experience. Attached Figure Description

[0025] Figure 1 This is a partial structural diagram of the outdoor unit of the air conditioner in an embodiment of the present invention.

[0026] Figure 2 This is a structural diagram of the compressor assembly in an embodiment of the air conditioner of the present invention.

[0027] Figure 3 This is a structural diagram of the muffler in an embodiment of the air conditioner of the present invention.

[0028] Figure 4 This is an exploded view of the muffler in an embodiment of the air conditioner of the present invention.

[0029] Figure 5 This is a cross-sectional view of the muffler in an embodiment of the air conditioner of the present invention.

[0030] Figure 6 This is a structural diagram of the control valve and the annular partition plate in an embodiment of the air conditioner of the present invention.

[0031] Figure 7 This is a schematic diagram of the control valve in an embodiment of the air conditioner of the present invention.

[0032] Figure 8 This is a structural diagram of the I-shaped sleeve in an embodiment of the air conditioner of the present invention.

[0033] Figure 9 This is a structural diagram of the ring sleeve in an embodiment of the air conditioner of the present invention.

[0034] Figure 10 This is a structural diagram of the ring plate in an embodiment of the air conditioner of the present invention.

[0035] Figure 11 This is a structural diagram of the resonant ring plate in an embodiment of the air conditioner of the present invention.

[0036] Figure 12 This is a structural diagram of the outer cover in an embodiment of the air conditioner of the present invention.

[0037] Figure 13 This is a schematic diagram of the first working state of the muffler in an embodiment of the air conditioner of the present invention.

[0038] Figure 14 This is a schematic diagram of the second working state of the muffler in an embodiment of the air conditioner of the present invention.

[0039] Figure 15 yes Figure 14 Enlarged view at point A.

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0041] Various exemplary embodiments of the invention will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the invention or its application or use. The invention can be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0042] The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, without excluding the possibility of encompassing other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] In this invention, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0044] All terms used in this invention (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0045] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0046] See Figures 1 to 5 In this embodiment, the outdoor unit 11 of the air conditioner is provided with a compressor assembly 12, including a compressor 121 and a muffler 122.

[0047] In this embodiment, the muffler 122 is provided with a silencing channel 1201. The two ends of the silencing channel 1201 in its flow direction are an inlet end 12243 and an outlet end 12213, respectively. A plurality of resonant cavities 1202 communicating with the silencing channel 1201 are arranged on the outer periphery of the silencing channel 1201 between the inlet end 12243 and the outlet end 12213. Furthermore, in this embodiment, a plurality of silencing ring chambers 1204 are arranged on the outer periphery of the silencing channel 1201 between the inlet end 12243 and the outlet end 12213. The plurality of silencing ring chambers 1204 and the plurality of resonant cavities 1202 are alternately arranged in the flow direction of the silencing channel 1201. Each silencing ring chamber 1204 has an annular through hole 1203 communicating with the resonant cavity 1202 on its end face near the inlet end 12243, and each silencing ring chamber 1204 has an external through hole 12251 on its outer peripheral surface. Furthermore, an outer ring cavity 1205 is provided between the outer peripheries of multiple silencing ring chambers 1204, and an opening and closing control mechanism is provided at the outer ring cavity 1205 between two adjacent silencing ring chambers 1204. The opening and closing control mechanism can connect or disconnect the outer ring cavities 1205 corresponding to two adjacent silencing ring chambers 1204.

[0048] In this embodiment, the outlet pipe of the compressor 121 is connected to the inlet end 12243 of the muffler 122. The outlet end 12213 of the muffler 122 is connected to the indoor unit of the air conditioner through a connecting pipe, so that the refrigerant fluid discharged by the compressor 121 enters the silencing channel 1201 of the muffler 122 from the inlet end 12243 of the muffler 122. Because the silencer 122 in this embodiment has multiple resonant cavities 1202 connected to the silencer channel 1201 arranged between the inlet end 12243 and the outlet end 12213 on the outer periphery of the silencer channel 1201, the refrigerant fluid in the silencer channel 1201 can periodically flow into the multiple resonant cavities 1202 arranged between the inlet end 12243 and the outlet end 12213 for noise reduction, and multiple silencer ring chambers 1204 are arranged between the inlet end 12243 and the outlet end 12213 on the outer periphery of the silencer channel 1201, the multiple silencer ring chambers 1204 and the multiple resonant cavities 1202 are alternately arranged in the flow direction of the silencer channel 1201, and each silencer ring chamber 1204 is close to the inlet end 12243. The end face of 43 is provided with an annular through hole 1203 communicating with the resonant cavity 1202, so that the refrigerant fluid in each resonant cavity 1202 flows periodically into each silencing ring chamber 1204 through the annular through hole 1203 for further noise reduction. Moreover, an outer ring cavity 1205 is provided between the outer peripheries of the multiple silencing ring chambers 1204, and an outer through hole 12251 is provided on the outer peripheral surface of each silencing ring chamber 1204, so that the refrigerant fluid in each silencing ring chamber 1204 flows into the outer ring cavity 1205 through the outer through hole 12251 for further noise reduction. Thus, the fluid medium entering the silencer 122 of this embodiment is subjected to multi-level, periodic Bragg bandgap principle noise reduction treatment, which broadens the noise reduction frequency band and improves the noise reduction effect.

[0049] When the noise of the fluid medium is in the low-to-mid frequency range, that is, when the flow rate of the refrigerant fluid discharged by the compressor 121 is small, and thus the fluid noise is not large, the control mechanism for opening and closing will operate, causing the outer annular cavity 1205 corresponding to the two adjacent silencer chambers 1204 to disconnect. Figure 13 As shown, the various silencing chambers 1204 are separated from each other, thereby making the silencing effect of the silencer 122 in the mid-low frequency range better.

[0050] When the noise of the fluid medium is in the high-frequency range, that is, when the flow rate of the refrigerant fluid discharged by the compressor 121 increases, thus increasing the fluid noise, the control mechanism for opening and closing will operate, connecting the outer annular cavities 1205 corresponding to the two adjacent silencing annular chambers 1204. Figure 14 and Figure 15As shown, the two adjacent silencing ring chambers 1204 are connected. At this time, some of the fluid medium in the front silencing ring chamber 1204 propagates through the outer ring cavity 1205 to the rear silencing ring chamber 1204 adjacent to it. The fluid medium in the rear silencing ring chamber 1204 and the fluid medium in the front silencing ring chamber 1204 are out of phase. When the two fluid media with different phases meet, they interfere and cancel each other out, further reducing noise. This makes the silencer 122 in this embodiment have a better noise reduction effect in the high-frequency range. Furthermore, the number of opening and closing control mechanisms can be selectively adjusted, and the opening degree of the opening and closing control mechanisms can also be selectively adjusted, thereby widening the high-frequency noise reduction range and thus broadening the noise reduction frequency band.

[0051] Therefore, the muffler 122 in this embodiment can adaptively adjust the optimal noise reduction path for different frequency bands, thereby widening the noise reduction frequency band and making the noise reduction effect better in different frequency bands, thereby improving the noise reduction effect and enhancing the user's comfort experience.

[0052] To further broaden the noise reduction range in both low and high frequency bands, each silencing ring chamber 1204 of the muffler 122 in this embodiment is provided with a resonant ring plate 1228 to divide the silencing ring chamber 1204 into a first chamber 12041 and a second chamber 12042. The first chamber 12041 and the second chamber 12042 are arranged side by side in the flow direction of the silencing channel 1201, and the resonant ring plate 1228 is provided with a through hole 12281. Each silencing ring chamber 1204 has multiple external through holes 12251 on its outer peripheral surface. The first chamber 12041 is connected to the outer ring cavity 1205 through a portion of the external through holes 12251, and the second chamber 12042 is connected to the outer ring cavity 1205 through another portion of the external through holes 12251. Therefore, each silencing ring chamber 1204 is provided with a resonant ring plate 1228 to divide the silencing ring chamber 1204 into a first chamber 12041 and a second chamber 12042. The resonant ring plate 1228 is provided with a through hole 12281. When the fluid medium in the resonant cavity 1202 flows into the silencing ring chamber 1204 through the through hole 1203, the fluid medium in the resonant cavity 1202 first flows into the first chamber 12041 near the through hole 1203, and then part of the fluid medium flows into the chamber away from the through hole 1204 through the through hole 12281 of the resonant ring plate 1228. The second chamber 12042 of 03 makes the muffler 122 of this embodiment have a better noise reduction effect in the low-frequency range, thereby widening the low-frequency noise reduction range. In addition, each muffler ring chamber 1204 has multiple external through holes 12251 on its outer peripheral surface. The first chamber 12041 is connected to the outer ring cavity 1205 through a part of the external through holes 12251, and the second chamber 12042 is connected to the outer ring cavity 1205 through another part of the external through holes 12251. The arrangement of multiple external through holes 12251 makes the muffler 122 of this embodiment have a better noise reduction effect in the high-frequency range, thereby widening the high-frequency noise reduction range.

[0053] To further broaden the low-frequency noise reduction range, in this embodiment, the aperture of the through holes 12281 of the multiple resonant ring plates 1228 gradually decreases from the inlet end 12243 to the outlet end 12213. That is, in the flow direction of the silencing channel 1201, D1>D2>D3>D4>D5… The Bragg band gap principle is used to achieve lower frequency noise reduction, thereby broadening the low-frequency silencing treatment and improving the silencing effect.

[0054] Specifically, in this embodiment, each resonant ring plate 1228 has a flow guide ring 12282 protruding from the end face away from the inlet end 12243 around the through hole 12281. The flow guide ring 12282 has a flow guiding function, so that part of the fluid medium in the first chamber 12041 near the ring through hole 1203 flows quickly and smoothly into the second chamber 12042 away from the ring through hole 1203 through the through hole 12281 of the resonant ring plate 1228, thereby reducing flow resistance.

[0055] See Figure 6 and Figure 7 In this embodiment, each opening and closing control mechanism includes an annular partition 1226 and a control valve 1223. An annular partition 1226 is disposed within the outer annular cavity 1205 between two adjacent silencing annular chambers 1204, and the annular partition 1226 has a valve. The control valve 1223 is disposed at the valve of the annular partition 1226 and controls the valve to open or close, thereby connecting or disconnecting the outer annular cavities 1205 corresponding to the two adjacent silencing annular chambers 1204. Specifically, in this embodiment, the control valve 1223 is a solenoid valve. When energized, the electromagnetic coil generates electromagnetic force to lift the telescopic rod 12231 from the valve, thus opening the valve; when de-energized, the electromagnetic force disappears, and the spring forces the telescopic rod 12231 into the valve, thus closing the valve.

[0056] To detect fluid medium parameters in real time and adaptively adjust the opening or closing of the control valve 1223 controlling the baffle 1226, this embodiment provides a sensor for the control valve 1223, or a sensor is provided within the outer annular cavity 1205 where the control valve 1223 is located. The sensor detects at least one parameter, such as fluid flow rate or fluid noise, within the outer annular cavity 1205. Only when the fluid medium parameters within the outer annular cavity 1205 reach a preset threshold is the control valve 1223 adjusted to open the control valve 1226 and the valve opening degree adjusted, thus connecting the outer annular cavities 1205 corresponding to two adjacent silencing annular chambers 1204 to balance the flow pressure of the fluid medium. To further enhance the noise reduction effect in the high-frequency range, the outer ring cavity 1205 in this embodiment includes multiple large-diameter cavity segments 12051 and multiple small-diameter cavity segments 12052. One large-diameter cavity segment 12051 is correspondingly arranged with a noise reduction ring chamber 1204, and one small-diameter cavity segment 12052 is correspondingly arranged with a resonant cavity 1202. An opening and closing control mechanism is arranged at one small-diameter cavity segment 12052.

[0057] See Figures 8 to 12In this embodiment, the muffler 122 includes multiple I-shaped sleeves 1227, multiple ring plates 1229, and multiple ring sleeves 1225. The bushing hole 12273 of the I-shaped sleeve 1227 forms a silencing channel 1201. The first end wall plate 12271 of the I-shaped sleeve 1227 is connected to the adjacent ring plate 1229 to form a resonant cavity 1202. The second end wall plate 12272 of the I-shaped sleeve 1227 forms an annular through hole 1203 between the ring plate 1229. A ring sleeve 1225 is located between the first end wall plate 12271 of an I-shaped sleeve 1227 and a ring plate 1229. A silencing annular chamber 1204 is formed between a ring sleeve 1225, an I-shaped sleeve 1227, and a ring plate 1229. Each ring sleeve 1225 has an external through hole 12251. The structure of the muffler 122 in this embodiment is simple, simplifying the manufacturing process.

[0058] Furthermore, the muffler 122 in this embodiment also includes an outer cover 1222, which is sleeved between the outer peripheries of the plurality of rings 1225 and forms an outer annular cavity 1205 between the plurality of rings 1225.

[0059] Furthermore, the muffler 122 in this embodiment also includes an inlet end cap 1224. The inlet end cap 1224 includes a first sleeve 12241 and a first expansion sleeve 12242 that are connected to each other. The end of the first sleeve 12241 away from the first expansion sleeve 12242 is the inlet end 12243. The end of the first expansion sleeve 12242 away from the first sleeve 12241 covers the end face of the outer cover 1222 near the inlet end 12243 to form a resonant cavity 1202 near the inlet end 12243. Alternatively, the end of the first expansion sleeve 12242 away from the first sleeve 12241 covers the annular plate 1229 near the inlet end 12243 to form a resonant cavity 1202 near the inlet end 12243. In this embodiment, the muffler 122 further includes an outlet cover 1221. The outlet cover 1221 includes a second sleeve 12211 and a second expansion sleeve 12212 that are connected to each other. The end of the second sleeve 12211 away from the second expansion sleeve 12212 is the outlet end 12213. The end of the second expansion sleeve 12212 away from the second sleeve 12211 is covered on the end face of the outer cover 1222 near the outlet end 12213 to form a resonant cavity 1202 near the outlet end 12213. Alternatively, the end of the second expansion sleeve 12212 away from the second sleeve 12211 is covered on the first end wall plate of the I-shaped sleeve 1227 near the outlet end 12213 to form a resonant cavity 1202 near the outlet end 12213.

[0060] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. A muffler, provided with a sound attenuation passage, two ends of the sound attenuation passage in a flow direction of the sound attenuation passage being an inlet end and an outlet end respectively, a plurality of resonance cavities being arranged on an outer periphery of the sound attenuation passage between the inlet end and the outlet end and being in communication with the sound attenuation passage, characterized in that: a plurality of sound attenuation ring chambers are arranged on the outer periphery of the sound attenuation passage between the inlet end and the outlet end, the plurality of sound attenuation ring chambers and the plurality of resonance cavities being arranged alternately in the flow direction of the sound attenuation passage, each of the sound attenuation ring chambers being provided with a ring through hole in an end face close to the inlet end and in communication with the resonance cavities, and an outer periphery of each of the sound attenuation ring chambers being provided with an outer through hole; an outer ring cavity is arranged between the outer peripheries of the plurality of sound attenuation ring chambers, and an opening and closing control mechanism is arranged at the outer ring cavity between two adjacent sound attenuation ring chambers, the opening and closing control mechanism being capable of connecting or disconnecting the outer ring cavities corresponding to the two adjacent sound attenuation ring chambers. 2.A muffler according to claim 1, characterized in that: each of the opening and closing control mechanisms comprises a ring partition plate and a control valve, one of the ring partition plates being arranged in the outer ring cavity between two adjacent sound attenuation ring chambers, and the ring partition plate being provided with a valve, the control valve being arranged at the valve and controlling the valve to open or close, so as to connect or disconnect the outer ring cavities corresponding to the two adjacent sound attenuation ring chambers. 3.A muffler according to claim 2, characterized in that: the control valve is provided with a sensor, or a sensor is arranged in the outer ring cavity where the control valve is located, the sensor being used to detect at least one parameter of fluid flow, fluid noise in the outer ring cavity; and / or the control valve is an electromagnetic valve. 4.A muffler according to claim 1, characterized in that: the outer ring cavity comprises a plurality of large-diameter cavity segments and a plurality of small-diameter cavity segments, one of the large-diameter cavity segments being arranged corresponding to one of the sound attenuation ring chambers, one of the small-diameter cavity segments being arranged corresponding to one of the resonance cavities, and one of the opening and closing control mechanisms being arranged at one of the small-diameter cavity segments. 5.A muffler according to claim 1, characterized in that: one resonance ring plate is arranged in each of the sound attenuation ring chambers to divide the sound attenuation ring chamber into a first cavity and a second cavity, the first cavity and the second cavity being arranged side by side in the flow direction of the sound attenuation passage, and the resonance ring plate being provided with a through hole; an outer periphery of each of the sound attenuation ring chambers is provided with a plurality of the outer through holes, the first cavity being connected to the outer ring cavity through a part of the outer through holes, and the second cavity being connected to the outer ring cavity through another part of the outer through holes. 6.A muffler according to claim 5, characterized in that: the through hole of the plurality of resonance ring plates gradually decreases in diameter from the inlet end to the outlet end. 7.A muffler according to claim 5, characterized in that: a guide ring is arranged protruding around the through hole on an end face of each of the resonance ring plates away from the inlet end. 8.A muffler according to any one of claims 1 to 7, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ The muffler comprises a plurality of I-shaped sleeves, a plurality of ring plates and a plurality of ring sleeves, the sleeve holes of the I-shaped sleeves form the sound damping channels, the first end wall plates of the I-shaped sleeves are connected with the adjacent ring plates to form the resonance cavities, and the second end wall plates of the I-shaped sleeves and the ring plates form the ring through holes; One of the ring sleeves is located between the first end wall plate of one of the I-shaped sleeves and one of the ring plates, and the ring sleeve, the I-shaped sleeve and the ring plate form the sound damping ring chambers, and each of the ring sleeves is provided with the outer through holes.

9. The muffler according to claim 8, characterized in that: The muffler further comprises an outer cover sleeve, which is sleeved between the outer peripheries of the plurality of ring sleeves and forms the outer ring cavity with the plurality of ring sleeves.

10. The muffler according to claim 9, characterized in that: The muffler further comprises an inlet end cover, which comprises a first sleeve and a first expansion sleeve connected in communication, one end of the first sleeve away from the first expansion sleeve is the inlet end, and one end of the first expansion sleeve away from the first sleeve is covered on the end face of the outer cover sleeve close to the inlet end to form the resonance cavity close to the inlet end, or one end of the first expansion sleeve away from the first sleeve is covered on the ring plate close to the inlet end to form the resonance cavity close to the inlet end.

11. The muffler according to claim 9, characterized in that: The muffler further comprises an outlet end cover, which comprises a second sleeve and a second expansion sleeve connected in communication, one end of the second sleeve away from the second expansion sleeve is the outlet end, and one end of the second expansion sleeve away from the second sleeve is covered on the end face of the outer cover sleeve close to the outlet end to form the resonance cavity close to the outlet end, or one end of the second expansion sleeve away from the second sleeve is covered on the first end wall plate of the I-shaped sleeve close to the outlet end to form the resonance cavity close to the outlet end.

12. A compressor assembly comprising a compressor and a muffler, and an outlet pipeline of the compressor is in communication with an inlet end of the muffler, characterized in that: The muffler is the muffler according to any one of claims 1 to 11.

13. An air conditioner comprising a compressor assembly, characterized in that: The compressor assembly is the compressor assembly according to claim 12.

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