Rotary compressor

Abstract

The present invention discloses a rotary compressor 100 including a compression mechanism 3 including a cylinder 31, a piston 32, a swing rod 39a, and a vane 39 extending in the axial direction of a shaft 4, including a root portion 39b at the end of the swing rod 39a. The cylinder 31 includes, on an inner surface 31c thereof, a holding portion 31a that rotatably supports the root portion 39b, and the piston 32 is formed with a vane groove 32a into which the swing rod 39a is inserted to reciprocate. The cylinder 31 includes a spacer 34 between the recess 31b of the holding portion 31a and the root portion 39b of the vane 39.

Description

Technical Field

[0007] ,

[0001] The present invention relates to a rotary compressor.

Background Art

[0002] As disclosed in Patent Document 1, it is known that a rotary compressor includes a cylinder, an eccentric portion of a shaft that rotates inside the cylinder, a piston rotatably fitted to the eccentric portion, a piston that forms a compression chamber between the piston and the cylinder, and a vane that divides the compression chamber into a high-pressure space and a low-pressure space. This Patent Document 1 is hereinafter referred to as PTL1. <00000​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Japanese Patent Publication No. 2012-13015 [Overview of the project] [Means for solving the problem]

[0009] To achieve the above objective, one embodiment of the present invention provides a rotary compressor comprising a cylinder, an eccentric portion of a shaft that revolves inside the cylinder, a piston rotatably fitted to the eccentric portion and forming a compression chamber between the piston and the cylinder, a oscillating rod, and vanes extending in the axial direction of the shaft, including a cylindrical root portion formed at the end of the oscillating rod, wherein the vanes extend across the cylinder and piston and divide the compression chamber into a high-pressure space and a low-pressure space, the cylinder includes a holding portion on its inner surface that rotatably supports the root portion, the piston is formed with a vane groove into which the oscillating rod is reciprocated and inserted, and the cylinder includes a gap between the recess of the inner surface holding portion and the root portion of the vanes.

[0010] Firstly, according to embodiments of the present invention, the vane includes a oscillating rod and a base portion that extends axially along the shaft at the cylinder-side end, and extends across the cylinder and piston. Furthermore, the cylinder is formed with a retaining portion that rotatably supports the base portion, and the piston is formed with a vane groove into which the vane is reciprocated and inserted.

[0011] Therefore, as the eccentric part rotates, the vane oscillates around its base as a pivot point and reciprocates within the vane groove of the piston.

[0012] Because vane grooves are formed inside the piston, the thickness of the cylinder in the rotary compressor's compression mechanism can be reduced. Therefore, even if the rotary compressor has a cylinder of the same dimensions as a conventional rotary compressor, the inner diameter of the cylinder can be increased. As a result, the volume of the compression chamber can be increased.

[0013] Secondly, since a gap is formed between the recess in the cylinder's holding portion and the base of the vane, the base does not come into contact with the recess in the cylinder. This reduces the surface area over which the base of the vane and the cylinder's holding portion slide against each other.

[0014] Therefore, even when the vane oscillates while sliding on the cylinder's holding part with its base as the pivot point, frictional wear of the vane can be reduced.

[0015] Therefore, according to the embodiment of the rotary compressor of the present invention, it is possible to increase the volume of the compression chamber and, similarly, prevent a shortening of the vane life.

[0016] The principles and advantages of the present invention will become clear when considered in conjunction with the attached drawings in the following description. [Brief explanation of the drawing]

[0017] [Figure 1] This is an explanatory diagram illustrating the schematic configuration of a rotary compressor 100 including a compression mechanism 3 according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] This is an enlarged view of the base portion 39b of the vane 39 in Figure 2. [Figure 4] Figure 2 is a perspective view of vane 39. [Figure 5A] This is an explanatory diagram of the oil supply passage within the compression mechanism 3. [Figure 5B] This is an explanatory diagram of the gap 34 between the vane 39 in Figure 5A and the curved portion 31b of the cylinder 31 in the first compression area 30A. [Modes for carrying out the invention]

[0018] One embodiment of the present invention will be described in detail below with reference to the drawings.

[0019] FIG. 1 is a schematic longitudinal sectional view of a rotary compressor 100 according to an embodiment. In FIG. 1, a two-cylinder rotary compressor including two cylinders is illustrated, but the rotary compressor of this embodiment is not limited to a two-cylinder rotary compressor. A single-cylinder rotary compressor or a multi-cylinder rotary compressor including three or more cylinders may also be used.

[0020] The rotary compressor 100 includes an electric motor 2 and a compression mechanism 3 to be driven through a shaft 4 by the electric motor 2 within a sealed container 1. An intake pipe 5 and an exhaust pipe 6 are connected to the sealed container 1. The intake pipe 5 is connected to the sealed container 1 from the outside and passes through the sealed container 1. The exhaust pipe 6 is configured to discharge compressed gas refrigerant.

[0021] The bottom of the sealed container 1 serves as an oil sump 1a configured to store lubricating oil. The lubricating oil stored within the oil sump 1a moves upward through an oil supply passage 4b due to a differential pressure acting within the oil supply passage 4b formed within the central portion of the shaft 4 in the axial direction of the shaft 4, and then the lubricating oil is sent to the compression mechanism 3.

[0022] The electric motor 2 includes a rotor 2a mounted on the shaft 4 and a stator 2b configured to rotationally drive the rotor 2a. By starting energization of the stator 2b, the rotor 2a is rotated to transmit a rotational force to the compression mechanism 3 through the shaft 4.

[0023] The compression mechanism 3 includes a first compression region 30A provided within the upper portion, a second compression region 30B provided within the lower portion, a first support member 40 disposed on the upper end surface of the first compression region 30A, and a second support member 50 disposed on the lower end surface of the second compression region 30B. An intermediate partition plate 60 is disposed between the first compression region 30A and the second compression region 30B so as to define the first compression region 30A and the second compression region 30B.

[0024] The first support member 40 includes a hollow cylindrical bearing portion 41 configured to support the shaft 4 so that it can rotate, and a flat annular end plate portion 42 configured to close the upper opening of the through hole 36 inside the cylinder 31, which will be described later, in the first compression region 30A. The second support member 50 also includes a hollow cylindrical bearing portion 51 configured to support the shaft 4 so that it can rotate, and a flat annular end plate portion 52 configured to close the lower opening of the through hole 36 inside the cylinder 31, which will be described later, in the second compression region 30B.

[0025] An intermediate partition plate 60 is positioned between the first compression area 30A and the second compression area 30B so as to define the first compression area 30A and the second compression area 30B. In this configuration, the compression mechanism 3 is constructed from the second support member 50, the second compression area 30B, the intermediate partition plate 60, the first compression area 30A, and the first support member 40, which are stacked from bottom to top in the order described.

[0026] Next, we will describe the first compression zone 30A and the second compression zone 30B. The first compression zone 30A and the second compression zone 30B have basically the same configuration. Therefore, in the following, we will describe the first compression zone 30A as a representative example.

[0027] The first compression region 30A includes a cylindrical cylinder 31, a vane 39 extending in the axial direction of the shaft 4, which includes a oscillating rod 39a and a cylindrical base portion 39b formed at the end of the oscillating rod 39a, and a piston 32 formed with a vane groove 32a into which the oscillating rod 39a is inserted as it reciprocates.

[0028] The cylinder 31 has a through hole 36 through which the shaft 4 passes. As shown in Figures 2 and 3, the cylinder 31 includes a retaining portion 31a on its inner surface 31c that rotatably supports the base portion 39b.

[0029] Furthermore, the retaining portion 31a of the cylinder 31 is formed with a recess 31b that is curved in the direction from the base portion 39b of the vane 39 toward the retaining portion 31a. The shape of the recess 31b is not limited to a curved shape that is curved in the direction from the base portion 39b of the vane 39 toward the retaining portion 31a, but may be a triangular recess or a wavy recess as long as it is recessed in the same direction.

[0030] Furthermore, a gap 34 is formed between the recess 31b of the inner surface 31c of the cylinder 31 and the base portion 39b of the vane 39, and this gap is formed to extend in the axial direction of the base portion 39b.

[0031] The piston 32 is rotatably fitted to the outer circumference of the eccentric portion 4a of the shaft 4 and is configured to rotate eccentrically within the through hole 36. As shown in Figure 2, the piston 32 is formed with a vane groove 32a into which the oscillating rod 39a of the vane 39 is reciprocated.

[0032] The vane 39 is configured to extend across the cylinder 31 and the piston 32. The vane 39 includes a pivot rod 39a, which is a plate-shaped member formed to be pivotable, and a cylindrical base portion 39b at the end of the pivot rod 39a, and extends in the axial direction of the shaft 4. Therefore, as the eccentric portion 4a of the shaft 4 rotates, the vane 39 pivots around the base portion 39b as a pivot point and reciprocates within the vane groove 32a of the piston 32.

[0033] Furthermore, since the vane grooves 32a are formed inside the piston 32, the thickness of the cylinder 31 of the compression mechanism 3 of the rotary compressor 100 can be reduced. Therefore, even if the rotary compressor 100 has a cylinder 31 with the same dimensions as a conventional rotary compressor, the inner diameter of the cylinder 31 can be increased.

[0034] Therefore, it is possible to increase the volume of the compression chamber 33 formed between the inner surface 31c of the through hole 36 formed in the cylinder 31 and the outer surface of the piston 32. The compression chamber 33 is divided into a high-pressure space and a low-pressure space by the vane 39.

[0035] As shown in Figure 3, the base portion 39b of the vane 39 is formed as a flat plane and includes a flat portion 39c that extends in the axial direction of the base portion 39b toward the spacing portion 34.

[0036] Generally, the sliding region that slides on the holding portion 31a needs to be polished with high precision. On the other hand, other regions do not require the same precision as the sliding region. Therefore, since the base portion 39b of the vane 39 includes the flat portion 39c, the processing time for the vane 39 can be shortened.

[0037] Furthermore, in order to polish the vane 39, it is necessary for the vane 39 to be fixed to the machining tool within two opposing planes. Since the flat portion 39c can be used as a fixed flat surface, not only can the accuracy of polishing be improved, but the polishing work will also become easier.

[0038] The rotation of shaft 4 causes repeated suction and compression of gaseous refrigerant within the first compression zone 30A and the second compression zone 30B. Subsequently, the refrigerant gas compressed within each of the first and second compression zones 30A and 30B is discharged from the discharge pipe 6 to the outside of the sealed container 1, thereby circulating the refrigerant within the refrigerant circuit.

[0039] As shown in Figure 5A, an oil supply passage 70 is formed as the gap between the first compression area 30A and the second compression area 30B, that is, between the two cylinders 31. Furthermore, the oil supply passage 70 is connected to the gap 34.

[0040] As described above, the internal space of the sealed container 1 is filled with compressed gas refrigerant containing lubricating oil. Therefore, the lubricating oil is guided to the oil supply passage 70 between the first compression area 30A and the second compression area 30B, and then to the gap section 34. The arrow "A" in Figure 5A indicates the flow of lubricating oil from the outside of the cylinder 31 to the gap section 34.

[0041] Therefore, the oil supply passage 70 is formed between the first compression area 30A and the second compression area 30B, and guides lubricating oil to the gap 34. Since the oil supply passage 70 is connected to the gap 34, the gap 34 can function as a passage for guiding lubricating oil between the holding area 31a and the vane 39.

[0042] Next, the flow of lubricating oil from oil reservoir 1a to vane 39 will be described in detail with reference to Figures 1 to 5B.

[0043] Firstly, when power is supplied to the electric motor 2, the shaft 4 is rotated by the electric motor 2. The rotation is in the forward direction. Due to the rotation of the shaft 4, the eccentric portion 4a performs eccentric rotational motion inside the through hole 36. Along with the eccentric rotational motion of the eccentric portion 4a, the piston 32 performs eccentric rotational motion inside the through hole 36 located inside the cylinder 31. As the piston 32 rotates, low-pressure refrigerant is drawn into the compression mechanism 3, and this low-pressure refrigerant is compressed in the compression chamber 33 to become high-pressure refrigerant. The high-pressure refrigerant passes through the discharge ports (not shown) of the first compression area 30A and the second compression area 30B, and is then discharged into the internal space of the sealed container 1.

[0044] Secondly, during operation of the rotary compressor 100, lubricating oil stored in the oil reservoir 1a of the sealed container 1 is sent to the compression mechanism 3 through the oil supply passage 4b, and the compression mechanism 3 is lubricated.

[0045] Furthermore, lubricating oil is mixed with the compressed gas refrigerant. Therefore, the lubricating oil mixed into the compressed gas refrigerant is guided to the oil supply passage 70, and the compressed gas refrigerant is guided around the vane 39 via the spacing section 34 within the compression mechanism 3.

[0046] As a result, lubricating oil is supplied to the compression mechanism 3 via the oil supply passage 4b, as well as via the oil supply passage 70 and the spacing section 34.

[0047] According to this embodiment, the vane 39 includes a pivot rod 39a and a base portion 39b, and similarly extends across the cylinder 31 and the piston 32. Furthermore, the cylinder 31 is formed with a retaining portion 31a that rotatably supports the base portion 39b, and the piston 32 is formed with a vane groove 32a into which the vane 39 is reciprocated. Therefore, as the eccentric portion 4a rotates, the vane 39 pivots around the base portion 39b and reciprocates within the vane groove 32a of the piston 32.

[0048] Furthermore, since the vane grooves 32a are formed inside the piston 32, the thickness of the cylinder of the compression mechanism 3 of the rotary compressor 100 can be reduced. Therefore, even if the rotary compressor 100 has a cylinder 31 of the same dimensions as a conventional rotary compressor, the inner diameter of the cylinder 31 can be increased. Consequently, the volume of the compression chamber 33 can be increased.

[0049] Furthermore, since a gap 34 is formed between the recess 31b of the cylinder 31 and the base 39b of the vane 39, the base 39b does not come into contact with the recess 31b of the cylinder 31. The sliding surface area between the base 39b of the vane 39 and the holding portion 31a of the cylinder 31 can be reduced. Therefore, even when the vane 39 swings while sliding on the holding portion 31a of the cylinder 31 with the base 39b as a pivot point, frictional wear of the vane 39 can be reduced. Lubricating oil can be supplied around the vane 39 using the gap 34 formed between the recess 31b of the cylinder 31 and the base 39b of the vane 39, as well as the oil supply passage 70.

[0050] Therefore, according to the embodiment of the rotary compressor 100, it is possible to increase the volume of the compression chamber 33 and, similarly, prevent a shortening of the vane life.

[0051] Specific embodiments of the present invention have been disclosed and described, and similarly illustrated in the accompanying drawings, but this is merely to allow for a better understanding of the principles of the present invention and not to limit the scope and spirit of the teachings of the present invention. To those skilled in the art, it will be clear that various adaptations and modifications of the design or materials of the present invention to different structures are possible and apparent without departing from the scope of the invention as determined by the claims. [Explanation of symbols]

[0052] 100 Rotary Compressors 1. Airtight container 1a Oil reservoir 2 Electric motor 2a Rotor 2b Stator 3. Compression mechanism 4 shafts 4a Eccentric part 4b Fueling channel 5 Suction pipe 6 Exhalation pipe 30A First Compression Area 30B Second Compression Area 31 cylinders 31a Holding part 31b Recess 31c Inner surface 32 pistons 32a Vane groove 33 Compression Chamber 34 Interval 36 through holes 39. Bane 39a Oscillating rod 39b Base 39c flat part 40 First support member 41 Bearing section 42 End plate part 50 Second support member 51 Bearing section 52 End plate part 60 Intermediate partition plates 70 Oil supply path A. Flow of lubricating oil from the outside of cylinder 31 to the gap 34

Claims

1. A rotary compressor (100), Cylinder (31) and The eccentric portion (4a) of the shaft (4) that rotates inside the cylinder (31), A piston (32) rotatably fitted into the eccentric portion (4a), wherein the piston (32) forms a compression chamber (33) between the piston (32) and the cylinder (31), The oscillating rod (39a) and the vane (39) extending in the axial direction of the shaft (4), including the base portion (39b) which is formed in a cylindrical shape at the end of the oscillating rod (39a) Compression mechanism including (3) Includes, The vane (39) extends across the cylinder (31) and the piston (32) and divides the compression chamber (33) into a high-pressure space and a low-pressure space. The cylinder (31) includes a holding portion (31a) on its inner surface (31c) that rotatably supports the base portion (39b), and the piston (32) is formed with a vane groove (32a) into which the oscillating rod (39a) is inserted in a reciprocating motion. The cylinder (31) includes a gap (34) between the recess (31b) of the inner surface (31c) and the base portion (39b) of the vane (39), The recess (31b) is formed extending from the holding portion (31a) of the cylinder (31), A rotary compressor (100) wherein the spacing portion (34) is formed to extend in the axial direction of the root portion (39b) and is formed to function as an oil supply passage (70) for guiding lubricating oil between the holding portion (31a) and the vane (39).

2. The rotary compressor (100) according to claim 1, wherein the recess (31b) of the inner surface (31c) is formed in a curved shape.

3. The compression mechanism (3) includes a first compression area (30A) provided in the upper part, a second compression area (30B) provided in the lower part, a first support member (40) positioned on the upper end surface of the first compression area (30A), a second support member (50) positioned on the lower end surface of the second compression area (30B), and an intermediate partition plate (60) positioned between the first compression area (30A) and the second compression area (30B) so as to define the first compression area (30A) and the second compression area (30B). The rotary compressor (100) according to claim 1, wherein an oil supply passage (70) is formed between the first compression area (30A) and the second compression area (30B), and the oil supply passage (70) guides lubricating oil to the gap (34).

4. The rotary compressor (100) according to claim 1, wherein the base portion (39b) of the vane (39) includes a flat portion (39c) that extends in the axial direction of the base portion (39b) and faces the spacing portion (34).

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