Multi-cylinder rotary compressor and refrigeration cycle device

Abstract

The embodiment of the present application provides a multi-cylinder rotary compressor and a refrigeration cycle device. The compression mechanism part of the multi-cylinder rotary compressor according to the embodiment of the present application comprises a first cylinder, a second cylinder and an intermediate cylinder, a first sound attenuation chamber and a second sound attenuation chamber, an intermediate sound attenuation chamber is defined in the intermediate cylinder, and the intermediate sound attenuation chamber is communicated with each of the first sound attenuation chamber and the second sound attenuation chamber. Since the intermediate sound attenuation chamber is formed in the intermediate cylinder, the sound attenuation chamber does not need to be arranged in the partition plate, so that the thickness of the partition plate is effectively controlled, the structure is simpler, easier to manufacture, lower in cost and larger in rigidity without loss. Moreover, the high-pressure gas discharged from the second cylinder is mixed with the high-pressure gas discharged from the intermediate cylinder in the intermediate sound attenuation chamber, and the pulsation noise generated during the exhaust can be further reduced. The multi-cylinder rotary compressor provided by the present application has the advantages of miniaturization, low noise, simple partition plate structure, easy manufacturing, low cost and large rigidity.

Description

Technical Field

[0001] This invention belongs to the field of rotary compressor technology, specifically a multi-cylinder rotary compressor and refrigeration cycle device. Background Technology

[0002] In the research on the configuration of silencer chambers for cylinders in three-cylinder and above multi-cylinder rotary compressors, silencer chambers for cylinders located at the ends of the compression mechanism are easy to design, while silencer chambers for cylinders located in the middle present difficulties in configuration. Related technologies disclose a design scheme that constructs a silencer chamber inside a partition plate, but this design increases the thickness of the partition plate. Therefore, not only does it increase the overall height of the compression mechanism, but it also leads to problems such as reduced rigidity of the partition plate, structural complexity, and increased manufacturing costs. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of the present invention propose a multi-cylinder rotary compressor that is small in size, low in noise, has a simple partition structure, is easy to manufacture, and has low cost.

[0004] Embodiments of the present invention also propose a refrigeration cycle device that is small in size, low in noise, and low in cost.

[0005] According to an embodiment of the present invention, a multi-cylinder rotary compressor has a compression mechanism and an electric motor housed within a sealed cavity of the housing. The compression mechanism includes: cylinders, comprising a first cylinder, a second cylinder, and an intermediate cylinder, the intermediate cylinder being located between the first cylinder and the second cylinder; each cylinder defining a compression chamber; and each cylinder having a sliding vane and a piston; a first partition plate being provided between the first cylinder and the intermediate cylinder, and a second partition plate being provided between the second cylinder and the intermediate cylinder; a main bearing and a secondary bearing, the main bearing being located on the side of the first cylinder away from the second cylinder to seal the first cylinder. The cylinder has a compression chamber, with the secondary bearing located on the side of the second cylinder away from the first cylinder to seal the compression chamber of the second cylinder; a first silencing chamber and a second silencing chamber, the first silencing chamber communicating with the compression chamber of the first cylinder and having an outlet communicating with the sealed chamber, the second silencing chamber communicating with the compression chamber of the second cylinder; an intermediate silencing chamber defined within an intermediate cylinder, the intermediate cylinder having an exhaust port communicating with its compression chamber and its intermediate silencing chamber, the intermediate silencing chamber communicating with each of the first silencing chamber and the second silencing chamber; and a crankshaft connected to the electric motor.

[0006] The multi-cylinder rotary compressor according to embodiments of the present invention defines an intermediate silencing chamber within the intermediate cylinder. Compared to rotary compressors in the related art that have an intermediate silencing chamber on a partition plate, this reduces the volume of the compression mechanism, facilitating compressor miniaturization. The partition plate structure is simpler, easier to manufacture, lower in cost, and has greater rigidity. Furthermore, the high-pressure gas discharged from the second cylinder mixes with the high-pressure gas discharged from the intermediate cylinder within the intermediate silencing chamber, which improves the pulsation of the discharged gas and further reduces the pulsating noise generated during exhaust; that is, the intermediate cylinder has a noise reduction effect.

[0007] Therefore, the multi-cylinder rotary compressor of the present invention has the advantages of miniaturization, low noise, simple partition structure, easy manufacturing, low cost, and high rigidity.

[0008] In some embodiments, the compression mechanism is provided with an exhaust passage that connects the second silencing chamber, the intermediate silencing chamber, and the first silencing chamber.

[0009] In some embodiments, the intermediate cylinders include multiple cylinders, and the exhaust passage includes one exhaust passage that connects to each of the intermediate mufflers; or, the intermediate cylinders include multiple cylinders, and the exhaust passages include multiple exhaust passages, with each of the multiple exhaust passages corresponding to one of the multiple intermediate mufflers.

[0010] In some embodiments, the multi-cylinder rotary compressor further includes a first silencer having the first silencer chamber and a second silencer having the second silencer chamber. The first silencer is disposed on the main bearing, the second silencer is disposed on the auxiliary bearing, the exhaust port is disposed on the first silencer, the main bearing has an exhaust port communicating with the compression chamber of the first cylinder and the first silencer chamber, and the auxiliary bearing has an exhaust port communicating with the compression chamber of the second cylinder and the second silencer chamber.

[0011] In some embodiments, each of the first partition plate, the second partition plate, the first cylinder, the second cylinder, the main bearing, and the auxiliary bearing is provided with a through hole; the intermediate cylinder includes one cylinder, and each of the through holes and the intermediate silencer chamber are axially opposite to and interconnected with each other on the crankshaft, so that the intermediate silencer chamber is connected to each of the first silencer chamber and the second silencer chamber; or, the intermediate cylinder includes multiple cylinders, and a third partition plate is provided between two adjacent intermediate cylinders, the third partition plate is provided with a through hole, and each of the through holes, each of the intermediate silencer chambers, and the through hole and the intermediate silencer chamber are axially opposite to and interconnected with each other on the crankshaft, so that each of the intermediate silencer chambers is connected to each of the first silencer chamber and the second silencer chamber.

[0012] In some embodiments, the first silencer chamber is disposed in the first cylinder, the second silencer chamber is disposed in the second cylinder, the air outlet is disposed on the main bearing, the first cylinder is provided with an exhaust port connecting the compression chamber of the first cylinder and the first silencer chamber, and the second cylinder is provided with an exhaust port connecting the compression chamber of the second cylinder and the second silencer chamber.

[0013] In some embodiments, both the first and second partition plates have through holes; the intermediate cylinder includes one, and the through holes of the first and second partition plates, the first silencing chamber, the second silencing chamber, and the intermediate silencing chamber are opposite to and interconnected with each other in the axial direction of the crankshaft, so that the intermediate silencing chamber is connected to each of the first and second silencing chambers; or, the intermediate cylinder includes multiple cylinders, and a third partition plate is provided between two adjacent intermediate cylinders, the third partition plate has through holes, and the through holes of the first and second partition plates, each of the third partition plates, the first silencing chamber, the second silencing chamber, and each intermediate silencing chamber are opposite to and interconnected with each other in the axial direction of the crankshaft, so that each intermediate silencing chamber is connected to each of the first and second silencing chambers.

[0014] In some embodiments, the intermediate cylinder further includes an exhaust device for opening and closing the exhaust port.

[0015] In some embodiments, the wall of the intermediate muffler chamber is provided with an air inlet and an air outlet communicating with the exhaust passage. The air inlet and the air outlet are opposite each other in the axial direction of the crankshaft, and the edge of each of the air inlet and the air outlet is inside the edge of the intermediate muffler chamber.

[0016] The refrigeration cycle device provided according to the embodiments of the present invention includes a multi-cylinder rotary compressor provided according to the above embodiments of the present invention.

[0017] The refrigeration cycle device according to the present invention, by providing the above-mentioned multi-cylinder rotary compressor, has the advantages of small size, low noise, and low cost.

[0018] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is an internal structural diagram of a multi-cylinder rotary compressor according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1XX cross-sectional view;

[0021] Figure 3 yes Figure 1 Plan view of the first / second partition in the middle;

[0022] Figure 4 yes Figure 1 YY cross-sectional view;

[0023] Figure 5 yes Figure 1 ZZ cross-sectional view.

[0024] Figure label:

[0025] 1. Multi-cylinder rotary compressor; 2. Housing; 3. Exhaust pipe; 4. Electric motor;

[0026] Compression mechanism 5; First cylinder 10; First compression chamber 10A; First piston 15A; First vane 16A; Exhaust passage 11; First sub-exhaust passage 11A; Second sub-exhaust passage 11B; Threaded hole 12; First intermediate partition 18A; Second intermediate partition 18B; Center hole 18C; Intermediate cylinder 20; Intermediate compression chamber 20B; Intermediate silencer 22; Intermediate exhaust port 22b; Exhaust valve 22c; Lift limiter 22d; Intermediate piston 2 5B; intermediate vane 26B; second cylinder 30; second compression chamber 30C; second piston 35C; second vane 36C; main bearing 40; first muffler 40A; exhaust port 60; first exhaust port 40a; secondary bearing 45; second muffler 45C; second exhaust port 45b; condenser 50; expansion device 51; evaporator 52; suction pipe 6; first suction pipe 6A; second suction pipe 6B; third suction pipe 6C; crankshaft 7; liquid reservoir 8. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following is based on Figures 1-5 A multi-cylinder rotary compressor 1 is described according to an embodiment of the present invention.

[0029] A multi-cylinder rotary compressor 1 according to an embodiment of the present invention includes a housing 2, a compression mechanism 5, and an electric motor 4. A sealed cavity is defined within the housing 2, and both the compression mechanism 5 and the electric motor 4 are disposed within the sealed cavity. The electric motor 4 provides driving force to the compression mechanism 5. An intake pipe 6 is connected to the side wall of the housing 2. An exhaust pipe 3 communicating with the sealed cavity is also connected to the housing 2.

[0030] The compression mechanism 5 includes: a cylinder, a main bearing 40 and a secondary bearing 45, a first silencing chamber and a second silencing chamber, and a crankshaft 7. Each cylinder defines a compression chamber, and each cylinder is equipped with a sliding vane and a piston. The piston is fitted within the compression chamber, and the sliding vane is fitted within a sliding vane groove formed within the cylinder and abuts against the outer circumferential surface of the piston. The sliding vane can reciprocate along the sliding vane groove. The crankshaft 7 is connected to an electric motor 4 to drive the piston to rotate eccentrically, causing the cylinder to perform intake and compression.

[0031] The cylinder includes a first cylinder 10, a second cylinder 30, and an intermediate cylinder 20 located between the first cylinder 10 and the second cylinder 30. A first partition plate 18A is provided between the first cylinder 10 and the intermediate cylinder 20, and a second partition plate 18B is provided between the second cylinder 30 and the intermediate cylinder 20. The first cylinder 10, the second cylinder 30, and the intermediate cylinder 20 are stacked. A main bearing 40 is located on the side of the first cylinder 10 away from the second cylinder 30, and a secondary bearing 45 is located on the side of the second cylinder 30 away from the first cylinder 10. The main bearing 40 and the secondary bearing 45 press and seal the first cylinder 10 and the second cylinder 30 together.

[0032] Specifically, a first compression chamber 10A is defined within the first cylinder 10, and a first piston 15A is disposed within the first compression chamber 10A. A first sliding vane 16A abuts against the outer peripheral surface of the first piston 15A. A second compression chamber 30C is defined within the second cylinder 30, and a second piston 35C is disposed within the second compression chamber 30C. A second sliding vane 36C abuts against the outer peripheral surface of the second piston 35C. A main bearing 40 is used to seal the first compression chamber 10A, and a secondary bearing 45 is used to seal the second compression chamber 30C. An intermediate compression chamber 20B is defined within the intermediate cylinder 20, and an intermediate piston 25B is disposed within the intermediate compression chamber 20B. An intermediate sliding vane 26B abuts against the outer peripheral surface of the intermediate piston 25B. It can be understood that the multi-cylinder rotary compressor 1 provided in this embodiment of the invention is a compressor with three or more cylinders.

[0033] The first silencing chamber is connected to the first compression chamber 10A. The first silencing chamber has an outlet 60 that communicates with the sealed cavity of the housing 2. High-pressure gas in the first compression chamber 10A can enter the first silencing chamber, and high-pressure gas in the first silencing chamber can be discharged through the outlet 60. The second silencing chamber is connected to the second compression chamber 30C, and high-pressure gas in the second compression chamber 30C can enter the second silencing chamber.

[0034] An intermediate silencer chamber 22 is defined within the intermediate cylinder 20. The intermediate cylinder 20 is provided with an intermediate exhaust port 22b that connects the intermediate compression chamber 20B and the intermediate silencer chamber 22. High-pressure gas in the intermediate compression chamber 20B can enter the intermediate silencer chamber 22 through the intermediate exhaust port 22b. Since the intermediate silencer chamber 22 is connected to each of the first and second silencer chambers, the high-pressure gas in the second silencer chamber will enter the intermediate silencer chamber 22 and merge with the high-pressure gas discharged from the intermediate exhaust port 22b. Then, the high-pressure gas in the intermediate silencer chamber 22 will enter the first silencer chamber and merge with the high-pressure gas discharged from the first compression chamber 10A. Subsequently, the high-pressure gas in the first silencer chamber will be discharged from the compression mechanism section 5 through the exhaust port 60 and enter the sealed cavity of the housing 2.

[0035] The multi-cylinder rotary compressor according to embodiments of the present invention defines an intermediate silencing chamber within the intermediate cylinder. Compared to rotary compressors in the related art that have an intermediate silencing chamber on a partition plate, this reduces the volume of the compression mechanism, facilitating compressor miniaturization. The partition plate structure is simpler, easier to manufacture, lower in cost, and has greater rigidity. Furthermore, the high-pressure gas discharged from the second cylinder mixes with the high-pressure gas discharged from the intermediate cylinder within the intermediate silencing chamber, which improves the pulsation of the discharged gas and further reduces the pulsating noise generated during exhaust; that is, the intermediate cylinder has a noise reduction effect.

[0036] Therefore, the multi-cylinder rotary compressor of the present invention has the advantages of miniaturization, low noise, simple partition structure, easy manufacturing, low cost, and high rigidity.

[0037] In an embodiment of the present invention, the compression mechanism 5 is provided with an exhaust passage 11, which is used to connect the second silencing chamber, the intermediate silencing chamber 22 and the first silencing chamber.

[0038] In some embodiments of the present invention, the intermediate cylinder includes one, i.e., when the multi-cylinder rotary compressor is a three-cylinder compressor, the exhaust passage 11 is one, which connects the second silencer chamber, the intermediate silencer chamber 22, and each of the first silencer chamber. Further, as... Figure 1 As shown, since the intermediate muffler 22 is located between the first and second mufflers, the exhaust passage 11 includes two sub-exhaust passages (first sub-exhaust passage 11A and second sub-exhaust passage 11B). The first sub-exhaust passage 11A connects the intermediate muffler 22 and the first muffler, and the second sub-exhaust passage 11B connects the intermediate muffler 22 and the second muffler. Preferably, the first sub-exhaust passage 11A, the intermediate muffler 22, and the second sub-exhaust passage 11B are axially opposite to each other on the crankshaft 7 to facilitate smoother exhaust, improve the structural rationality of the compression mechanism 5, and reduce the machining difficulty of the compression mechanism 5.

[0039] In other embodiments of the present invention, the intermediate cylinders 20 include multiple cylinders, i.e., when the multi-cylinder rotary compressor 1 is a compressor with three or more cylinders, in a preferred embodiment of the present invention, the exhaust passage 11 includes one exhaust passage 11, which connects each intermediate silencer chamber 22. That is, by providing one exhaust passage 11, the first silencer chamber, the second silencer chamber, and each intermediate silencer chamber 22 can be interconnected, reducing the processing difficulty of the compression mechanism 5 and simplifying its structure. It is understood that the exhaust passage 11 may include multiple sub-exhaust passages.

[0040] In an optional embodiment of the present invention, the exhaust passage 11 includes multiple passages, each corresponding to a plurality of intermediate silencers. That is, in this embodiment, the exhaust passage 11 connects the first silencer, the second silencer, and one of the intermediate silencers 22, and the number of exhaust passages 11 is the same as the number of intermediate cylinders 20. It is understood that gas in the second silencer can enter the first silencer through any one of the exhaust passages 11.

[0041] Additionally, it should be noted that in other embodiments of the present invention, the exhaust passage 11 may also connect to several of the multiple intermediate silencing chambers, thereby reducing the number of exhaust passages 11 provided.

[0042] In a preferred embodiment of the present invention, an air inlet and an air outlet communicating with the exhaust passage 11 are provided on the wall of the intermediate silencing chamber 22, and the air inlet and the air outlet are opposite each other in the axial direction of the crankshaft 7. For example, as Figure 1 As shown, the air inlet of the intermediate silencing chamber 22 is located on its lower wall, and the air outlet of the intermediate silencing chamber 22 is located on its upper wall. Figure 4 As shown, the edge of each of the air inlet and the air outlet is inside the edge of the intermediate silencer 22. This arrangement allows the high-pressure gas from the exhaust passage 11 to enter the intermediate silencer 22 more smoothly, and allows the high-pressure gas in the intermediate silencer 22 to be discharged more smoothly, thereby improving the structural rationality of the compression mechanism 5.

[0043] In some embodiments of the present invention, such as Figure 1As shown, the multi-cylinder rotary compressor also includes a first silencer 40A and a second silencer 45C. The first silencer 40A defines a first silencer chamber, and the second silencer 45C defines a second silencer chamber. The first silencer 40A is mounted on the main bearing 40, and the second silencer 45C is mounted on the auxiliary bearing 45. An exhaust port 60 is located on the first silencer 40A. Specifically, the first silencer 40A is located on the side of the main bearing 40 away from the first cylinder 10, and the second silencer 45C is located on the side of the auxiliary bearing 45 away from the second cylinder 30. A first exhaust port 40a is provided on the main bearing 40, connecting the first compression chamber 10A and the first silencer chamber, and a second exhaust port 45b is provided on the auxiliary bearing 45, connecting the second compression chamber 30C and the second silencer chamber.

[0044] Furthermore, each of the first partition plate 18A, the second partition plate 18B, the first cylinder 10, the second cylinder 30, the main bearing 40, and the auxiliary bearing 45 is provided with a through hole.

[0045] like Figure 1 As shown, when the intermediate cylinder 20 includes one, each through hole is axially opposite and interconnected with each other and with the intermediate muffler 22 on the crankshaft 7, so that the intermediate muffler 22 is connected to each of the first and second mufflers. That is, the intermediate muffler 22 is connected to the first muffler through a connecting hole passing through the main bearing 40, the first cylinder 10, and the first partition plate 18A, and the intermediate muffler 22 is connected to the second muffler through a connecting hole passing through the second partition plate 18B, the second cylinder 30, and the auxiliary bearing 45. It can be understood that the through holes of the main bearing 40, the first cylinder 10, and the first partition plate 18A constitute the first sub-exhaust passage 11A, and the through holes of the second partition plate 18B, the second cylinder 30, and the auxiliary bearing 45 constitute the second sub-exhaust passage 11B. The axially opposite arrangement of each through hole and the intermediate muffler 22 on the crankshaft 7 makes the structure of the exhaust passage 11 more rational and the exhaust flow smoother.

[0046] When there are multiple intermediate cylinders 20, a third partition plate (not shown in the figure) is provided between two adjacent intermediate cylinders 20. The third partition plate is used to connect two adjacent intermediate cylinders 20 and seal the intermediate sealing cavity 20B. Furthermore, the third partition plate is also provided with through holes. Each through hole, each intermediate silencing chamber 22, and the through holes and intermediate silencing chambers 22 are opposite to each other and interconnected in the axial direction of the crankshaft 7, so that each intermediate silencing chamber 22 is connected to each of the first silencing chamber and the second silencing chamber.

[0047] In other embodiments of the present invention, a first silencing chamber is disposed within a first cylinder 10, and a second silencing chamber is disposed within a second cylinder 30. That is, the first cylinder 10 defines the first silencing chamber, and the second cylinder 30 defines the second silencing chamber. An exhaust port 60 is disposed on the main bearing 40, and the high-pressure gas in the first silencing chamber is discharged through the exhaust port 60 on the main bearing 40. A first exhaust port 40a is disposed within the first cylinder 10, connecting the first compression chamber 10A and the first silencing chamber. A second exhaust port 45b is disposed within the second cylinder 30, connecting the second compression chamber 30C and the second silencing chamber.

[0048] Furthermore, both the first partition plate 18A and the second partition plate 18B have through holes.

[0049] When the intermediate cylinder 20 includes a through hole in the first intermediate partition 18A, a through hole in the second intermediate partition 18B, a first muffler chamber, a second muffler chamber, and an intermediate muffler chamber 22, they are axially opposite to and interconnected with each other on the crankshaft 7, so that the intermediate muffler chamber communicates with each of the first and second muffler chambers and facilitates smoother exhaust flow. Specifically, the first muffler chamber and the intermediate muffler chamber 22 are connected through the through hole in the first intermediate partition 18A, and the second muffler chamber and the intermediate muffler chamber 22 are connected through the through hole in the second intermediate partition 18B.

[0050] When there are multiple intermediate cylinders 20, a third intermediate partition is provided between two adjacent intermediate cylinders 20. The third intermediate partition has through holes. The through holes of the first intermediate partition 18A, the second intermediate partition 18B, each of the third intermediate partitions, the first muffler, the second muffler, and each intermediate muffler 22 are axially opposite to and interconnected with each other on the crankshaft 7, so that each intermediate muffler 22 is connected to each of the first and second mufflers and to facilitate smoother exhaust flow.

[0051] Optionally, in the two embodiments described above, an exhaust device may be provided in any of the first exhaust port 40a, the second exhaust port 45b, and the intermediate exhaust port 22b. The exhaust device is used to open or close the exhaust port. For example, if an exhaust device is provided in the first exhaust port 40a, when the exhaust pressure in the first compression chamber 10A causes the exhaust device to open the first exhaust port 40a, the high-pressure gas in the first compression chamber 10A is discharged into the first silencing chamber.

[0052] In a preferred embodiment of the invention, each cylinder has the same displacement.

[0053] The refrigeration cycle device according to an embodiment of the present invention includes a multi-cylinder rotary compressor 1 according to the above embodiment of the present invention.

[0054] The refrigeration cycle device according to the present invention, by providing the above-mentioned multi-cylinder rotary compressor 1, has the advantages of small size, low noise and low cost.

[0055] To better understand the solutions of the embodiments of the present invention, please refer to the following: Figures 1-5 Specific embodiments of the present invention will be described in detail.

[0056] Figure 1 The internal structure of the multi-cylinder rotary compressor 1 of the present invention is shown. The multi-cylinder rotary compressor 1 consists of an electric motor 4 fixed on the inner peripheral wall of the housing 2 and a compression mechanism 5 driven by the electric motor 4. Lubricating oil (not shown in the figure) is injected into the bottom of the housing 2.

[0057] The compression mechanism 5 comprises a first cylinder 10, a second cylinder 30, an intermediate cylinder 20 located between the first cylinder 10 and the second cylinder 30, a first partition plate 18A located between the first cylinder 10 and the intermediate cylinder 20, a second partition plate 18B located between the second cylinder 30 and the intermediate cylinder 20, a main bearing 40 connected to the first cylinder 10, a secondary bearing 45 connected to the second cylinder 20, a first muffler 40A connected to the main bearing 40, and a second muffler 45A connected to the secondary bearing 45. These components are assembled with screws. The outer periphery of the first cylinder 10 is fixed to the inner peripheral wall of the housing 2. In this embodiment, the multi-cylinder rotary compressor 1 is a three-cylinder compressor.

[0058] The intermediate cylinder 20 defines an intermediate muffler chamber 22. The intermediate muffler chamber 22 is connected to the first muffler chamber through a first sub-exhaust passage 11A that passes through the main bearing 40, the first cylinder 10 and the first intermediate partition 18A. The intermediate muffler chamber 22 is connected to the second muffler chamber through a second sub-exhaust passage 11B that passes through the auxiliary bearing 45, the second cylinder 30 and the second intermediate partition 18B.

[0059] Three suction pipes 6 (first suction pipe 6A, second suction pipe 6B, and third suction pipe 6C) are connected to the side of the housing 2. One end of each suction pipe 6 is connected to the first compression chamber 10A of the first cylinder 10, the second compression chamber 30C of the second cylinder 30, and the intermediate compression chamber 20B of the intermediate cylinder 20, respectively. The other end of each pipe is connected to the reservoir 8. Low-pressure gas can enter the first compression chamber 10A, the second compression chamber 30C, and the intermediate compression chamber 20B from the reservoir 8 via the suction pipes 6. An exhaust pipe 3 is connected to the top of the housing 2.

[0060] The crankshaft 7 is connected to the electric motor 4 to drive the first piston 15A, the intermediate piston 25B and the second piston 35C to rotate eccentrically, and the first vane 16A, the intermediate vane 26B and the second vane 36C to reciprocate. Therefore, low-pressure gas is drawn in and compressed in the first compression chamber 10A, the second compression chamber 30C and the intermediate compression chamber 20B.

[0061] The compressed high-pressure gases discharged from the first compression chamber 10A, the second compression chamber 30C, and the intermediate compression chamber 20B respectively enter the first silencing chamber, the second silencing chamber, and the intermediate silencing chamber 22. The high-pressure gases in the second silencing chamber enter the intermediate silencing chamber 22 through the first sub-exhaust channel 11A and then merge. The merged high-pressure gases in the intermediate silencing chamber 22 then enter the first silencing chamber through the second sub-exhaust channel 11B and merge again. The merged high-pressure gases in the first silencing chamber are discharged through the outlet 60 on the first silencer 40A into the space below the motor 4, and then discharged from the exhaust pipe 3 through the motor 4, entering the condenser 50. The liquid refrigerant condensed in the condenser 50 has its pressure reduced by the expansion device 51. The liquid refrigerant then flows to the evaporator 52, evaporates into low-pressure gas, and flows into the liquid receiver 8. The low-pressure gas from the reservoir 8 then flows into the first compression chamber 10A, the second compression chamber 30C, and the intermediate compression chamber 20B through the first suction pipe 6A, the second suction pipe 6B, and the third suction pipe 6C, respectively.

[0062] In this embodiment, an intermediate silencer chamber 22 is provided within the intermediate cylinder 20. Therefore, it is unnecessary to provide an intermediate silencer chamber 22 in the first intermediate partition 18A or the second intermediate partition 18B for silencing the high-pressure gas in the intermediate compression chamber 20B. Consequently, the structures of the first intermediate partition 18A and the second intermediate partition 18B are simpler, easier to manufacture, and lower in cost, while their rigidity remains unaffected. Furthermore, the high-pressure gas discharged from the second compression chamber 30C mixes with the high-pressure gas discharged from the intermediate compression chamber 20B in the intermediate silencer chamber 22, which reduces the pulsating noise generated during exhaust. In other words, the intermediate silencer chamber 22 has a noise reduction effect.

[0063] Figure 2 for Figure 1 The XX cross-sectional view shows the plan view of the first cylinder 10. The first cylinder 10 has a cylindrical first compression chamber 10A in the center. The first piston 15A rotates eccentrically in the first compression chamber 10A under the drive of the crank 7. The first sliding vane 16A, which is in contact with the first piston 15A, reciprocates. Therefore, the low-pressure gas drawn in from the first intake pipe 6A is compressed into high-pressure gas in the first compression chamber 10A. The high-pressure gas enters the first muffler 40A through the first exhaust port 40a opened on the main bearing 40.

[0064] like Figure 2 As shown, the first cylinder 10 has a through hole as part of the first sub-exhaust passage 11A. In this embodiment, the through hole is axially opposite to the through hole on the main bearing 50, the through hole on the first middle partition 18A, and the intermediate cylinder 20 on the crankshaft 7.

[0065] The threaded hole 12 is used for installation. Specifically, screws pass through the threaded hole 12 to mount the main bearing 40 and the first cylinder 10 onto the first intermediate partition 18A.

[0066] Figure 3 This is a plan view of the first intermediate partition 18A, which connects the first cylinder 10 and the intermediate cylinder 20, and seals the first compression chamber 10A and the intermediate compression chamber 20B. The center hole 18C is the hole through which the eccentric shaft of the crankshaft 7 passes during the assembly process of the compression mechanism 5. The dashed line represents the ridge line of the first compression chamber 10A.

[0067] It is understandable that the first partition 18A can have the same structure as the second partition 18B. Figure 3 It can also be represented as a plan view of the second partition 18B, in which the through hole is part of the second sub-exhaust passage 11B.

[0068] Figure 4 for Figure 1 The YY cross-sectional view shows a plan view of the intermediate cylinder 20. The intermediate cylinder 20 has an intermediate compression chamber 20B, an intermediate silencer chamber 22, and an intermediate exhaust port 22b connecting the intermediate compression chamber 20B and the intermediate silencer chamber 22. The intermediate cylinder 20 also has an exhaust device for opening and closing the intermediate exhaust port 22b, which includes an exhaust valve 22c and a lift limiter 22d for limiting the operating range of the exhaust valve 22c. The lift limiter 22d fixes one end of the exhaust valve 22c to the side wall of the intermediate silencer chamber 22. When the exhaust pressure in the intermediate compression chamber 20B causes the exhaust valve 22c to disengage from the side wall of the intermediate silencer chamber 22, thereby opening the intermediate exhaust port 22b, the high-pressure gas in the intermediate compression chamber 20B is discharged into the intermediate silencer chamber 22.

[0069] like Figure 4 As shown, the second sub-exhaust passage 11B is connected to the air inlet of the intermediate muffler chamber 22, and the edge of the air inlet of the intermediate muffler chamber 22 is inside the edge of the intermediate muffler chamber 22. This arrangement allows the high-pressure gas in the second sub-exhaust passage 11B to enter the intermediate muffler chamber 22 more smoothly. Similarly, the first sub-exhaust passage 11A is connected to the air outlet of the intermediate muffler chamber 22, and the edge of the air outlet of the intermediate muffler chamber 22 is inside the edge of the intermediate muffler chamber 22. This arrangement allows the high-pressure gas in the intermediate muffler chamber 22 to enter the first sub-exhaust passage 11A more smoothly, improving the structural rationality of the compression mechanism 5.

[0070] Similar to the first cylinder 10, the intermediate piston 25B rotates eccentrically in the intermediate compression chamber 20B under the drive of the crank 7, and the intermediate slide 26B that abuts against the intermediate piston 25B reciprocates. Therefore, the low-pressure gas flowing in from the second intake pipe 6B is compressed into high-pressure gas in the intermediate compression chamber 20B, and the high-pressure gas enters the intermediate silencer chamber 22 through the intermediate exhaust port 22b.

[0071] The threaded hole 12 is used for installation. Specifically, a screw passes through the threaded hole 12 to connect the intermediate cylinder 20 to the first intermediate partition 18A and the second intermediate partition 18B.

[0072] Figure 5 for Figure 1 The ZZ cross-sectional view shows the plan view of the second cylinder 30. Except for the outer peripheral shape, the other structures of the second cylinder 30 are similar to those of the first cylinder 10, and will not be described in detail here.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0077] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-cylinder rotary compressor characterized by comprising: The sealed cavity of the housing contains a compression mechanism and a motor, the compression mechanism comprising: a cylinder, the cylinder comprising a first cylinder, a second cylinder and an intermediate cylinder, the intermediate cylinder being located between the first cylinder and the second cylinder, each of the cylinders defining a compression chamber therein, each of the cylinders being provided with a sliding vane and a piston therein; a first partition plate being provided between the first cylinder and the intermediate cylinder, and a second partition plate being provided between the second cylinder and the intermediate cylinder; a main bearing being provided on a side of the first cylinder away from the second cylinder so as to seal the compression chamber of the first cylinder, and a secondary bearing being provided on a side of the second cylinder away from the first cylinder so as to seal the compression chamber of the second cylinder; a first muffling chamber being in communication with the compression chamber of the first cylinder, the first muffling chamber being provided with an air outlet hole in communication with the sealed cavity, and a second muffling chamber being in communication with the compression chamber of the second cylinder, the intermediate cylinder defining an intermediate muffling chamber therein, the intermediate cylinder being provided with an exhaust hole in communication with the compression chamber thereof and the intermediate muffling chamber, the intermediate muffling chamber being in communication with each of the first muffling chamber and the second muffling chamber; and a crankshaft being connected with the motor; 2. The multi-cylinder rotary compressor of claim 1, wherein, the first muffling chamber being provided in the first cylinder, the second muffling chamber being provided in the second cylinder, the air outlet hole being provided on the main bearing, the first cylinder being provided with an exhaust hole in communication with the compression chamber of the first cylinder and the first muffling chamber, and the second cylinder being provided with an exhaust hole in communication with the compression chamber of the second cylinder and the second muffling chamber.

3. The multi-cylinder rotary compressor of claim 2, wherein, The compression mechanism is provided with an exhaust passage, the exhaust passage being in communication with the second muffling chamber, the intermediate muffling chamber and the first muffling chamber. The intermediate cylinder comprises a plurality of intermediate cylinders, and the exhaust passage comprises one exhaust passage, the exhaust passage being in communication with each of the intermediate muffling chambers; 4. The multi-cylinder rotary compressor of claim 1, wherein, alternatively, the intermediate cylinder comprises a plurality of intermediate cylinders, and the exhaust passage comprises a plurality of exhaust passages, each of the plurality of exhaust passages being in communication with one of the plurality of intermediate muffling chambers. Each of the first partition plate and the second partition plate is provided with a through hole; the intermediate cylinder comprises one intermediate cylinder, the through hole of the first partition plate, the through hole of the second partition plate, the first muffling chamber, the second muffling chamber and the intermediate muffling chamber being opposite to each other in the axial direction of the crankshaft and being in communication with each other, so that the intermediate muffling chamber is in communication with each of the first muffling chamber and the second muffling chamber, 5. The multi-cylinder rotary compressor of claim 1, wherein alternatively, the intermediate cylinder comprises a plurality of intermediate cylinders, a third partition plate being provided between two adjacent intermediate cylinders, the third partition plate being provided with a through hole, the through hole of the first partition plate, the through hole of the second partition plate, the through hole of each of the third partition plates, the first muffling chamber, the second muffling chamber and each of the intermediate muffling chambers being opposite to each other in the axial direction of the crankshaft and being in communication with each other, so that each of the intermediate muffling chambers is in communication with each of the first muffling chamber and the second muffling chamber. The intermediate cylinder further comprises an exhaust device for opening and closing the exhaust hole.

6. The multi-cylinder rotary compressor of claim 2, wherein, The intermediate sound deadening chamber has an air inlet and an air outlet formed in the wall thereof and communicating with the exhaust passage, the air inlet and the air outlet are opposite in the axial direction of the crankshaft, and the edge of each of the air inlet and the air outlet is inside the edge of the intermediate sound deadening chamber.

7. A refrigeration cycle apparatus characterized by comprising: A multi-cylinder rotary compressor comprising a cylinder block according to any one of claims 1 to 6.

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