Rotary compressor

Abstract

To provide a rotary compressor that reduces the number of components and cost.SOLUTION: A horizontal rotary compressor (1) comprises: a compression mechanism part (5) comprising a cylinder, an annular piston to be eccentrically rotated in the cylinder, and a crankshaft (9) and compressing refrigerant gas; an electric element (6) for driving the crankshaft (9); and a body housing (2) housing the compression mechanism part (5) and the electric element (6). The body housing (2) is a bottomed cylindrical body of which an end part is opened. A closed container is constituted of the body housing (2) and a cup-shaped lid body (3) fixed to the end part of the cylindrical body. A partition member (20) for partitioning an internal space of the closed container into the side of the body housing (2) and the side of the lid body (3) is provided. The partition member (20) comprises a body side seal part (22) for sealing an inner surface of the body housing (2), and a lid side seal part (23) for sealing an inner surface of the lid body (3).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a horizontally mounted rotary compressor, and particularly to a partition member having a bearing function with multiple functions, aiming to reduce the number of parts and costs.

Background Art

[0002] Conventionally, a rotary compressor having a compression mechanism for compressing refrigerant gas, which includes a cylinder, an annular piston that eccentrically rotates within the cylinder, and a crankshaft that rotationally drives the piston, an electric element for driving the crankshaft, and a main body housing that houses the compression mechanism and the electric element, has been widely used in practice.

[0003] For example, in the hermetic rotary compressor described in Patent Document 1, a rotary compression mechanism and an electric motor are incorporated in a housing, and the ends of the rotary shaft member are supported by a pair of bearing end plates on both sides of the compression mechanism, and these bearing end plates are fixed to the cylinder member of the compression mechanism.

[0004] In the vertical rotary compressor having a two-stage compression mechanism described in Patent Document 2, a compression mechanism and an electric motor are incorporated in a housing. The compression mechanism includes an end plate portion, a high-pressure side compression portion, an intermediate partition plate, a low-pressure side compression portion, and an end side end plate portion. The upper end portion of the housing is composed of a lid portion separate from the housing body, and the lower end portion of the housing is composed of a bottom portion separate from the housing body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Generally, it is advantageous from the perspective of the assembly work surface to adopt a structure in which the housing of the compressor is divided at a position near the compression mechanism portion. In this case, it is common to adopt a structure in which the divided portion of the housing is sealed with a sheet-like packing or the like, but it is difficult to ensure the reliability and durability of the sealing structure using packing or the like.

[0007] Also, generally, the cylinder is fixed to the inner surface of the housing by shrink fitting or welding, and a structure in which a bearing end plate for supporting the rotating shaft is fixed to the cylinder by bolt connection or the like is adopted, but it is difficult to improve the accuracy of the concentricity between the axis of the shaft hole of the cylinder and the axis of the bearing of the bearing end plate.

[0008] An object of the present invention is to provide a rotary compressor in which the housing is composed of a main body housing and a cup-shaped lid, and a partition member for partitioning the internal space has a plurality of functions to reduce the number of parts and cost.

Means for Solving the Problems

[0009] The rotary compressor according to claim 1 has a compression mechanism portion for compressing refrigerant gas, which includes a cylinder, an annular piston that eccentrically rotates inside the cylinder, and a crankshaft that rotationally drives the piston, an electric element for driving the crankshaft, and a main body housing that houses the compression mechanism portion and the electric element. The axis of the crankshaft is a horizontally disposed rotary compressor that extends in the horizontal direction. The main body housing is a bottomed cylindrical body with an open end, and a sealed container is formed by this main body housing and a cup-shaped lid fixed to the end of the cylindrical body. A partition member for partitioning the internal space of this sealed container into the main body housing side and the lid side is provided, and the partition member is characterized by including a main body side seal portion for sealing the inner surface of the main body housing and a lid side seal portion for sealing the inner surface of the lid.

[0010] According to the above configuration, a sealed container is formed by the main body housing and the cup-shaped lid fixed to its end. A partition member is provided to partition the internal space of this sealed container into the main body housing side and the lid side. The partition member is provided with a main body side seal portion for sealing the inner surface of the main body housing and a lid side seal portion for sealing the inner surface of the lid. Therefore, the partition member can be provided with a partitioning function for partitioning the internal space and a sealing function for sealing two locations, namely, the inner surface of the main body housing and the inner surface of the lid, enabling reduction of the number of parts and cost reduction.

[0011] Moreover, since two locations, namely, the inner surface of the main body housing and the inner surface of the lid, are sealed, the reliability of the sealing function can be enhanced.

[0012] The rotary compressor according to claim 2 is characterized in that, in the invention of claim 1, the partition member includes a bearing portion for supporting the end of the crankshaft. According to the above configuration, by providing a bearing portion on the partition member fixed inside the sealed container, the accuracy of the axial center position of the bearing can be improved, and the partition member can be effectively utilized.

[0013] The rotary compressor according to claim 3 is characterized in that, in the invention of claim 1 or 2, the partition member and the inner space portion of the lid portion are configured such that the refrigerant gas returns thereto, and a storage portion for the refrigeration machine oil is provided at the lower portion of the space portion. According to the above configuration, a refrigerant gas storage portion for accommodating the refrigerant gas can be formed in the partition member and the inner space portion of the lid portion, and a storage portion for the refrigeration machine oil can be formed at the lower portion of the space portion.

[0014] The rotary compressor according to claim 4 is characterized in that, in the invention of claim 3, there is a refrigerant gas inlet at the upper portion of the partition member, and a refrigerant passage extending downward from the inlet through the inside of the partition member is provided and connected to the refrigerant suction port of the compression mechanism portion. According to the above configuration, a refrigerant gas inlet and a refrigerant passage are formed in the partition member, and from the refrigerant passage Refrigerant gas can flow into the refrigerant suction port of the compression mechanism section. Thus, by effectively utilizing the partition member, a refrigerant gas passage can be formed.

[0015] The rotary compressor according to claim 5 is characterized in that, in the invention according to claim 4, it is provided with a communication hole for communicating the refrigerant passage and the storage section. According to the above configuration, since a communication hole for communicating the refrigerant passage and the storage section is provided, the refrigerating machine oil stored in the storage section can be supplied to the compression mechanism section.

Effect of the Invention

[0016] According to the present invention, the various actions and effects as described above can be obtained.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0018] Hereinafter, embodiments for carrying out the present invention will be described based on examples (see FIGS. 1 to 6). In the figures, reference symbol F indicates the front, reference symbol B indicates the rear, and reference symbol R indicates the right side.

Example

[0019] As shown in FIGS. 1 to 3, in a horizontally placed rotary compressor 1, a sealed container 4 is formed by a main body housing 2 and a cup-shaped lid body 3 fixed to an end portion of the main body housing 2. A compression mechanism portion 5 and an electric element 6 are incorporated in an internal space of the sealed container 4.

[0020] The compression mechanism portion 5 includes a cylinder 7 having a circular cylinder hole 7a, an annular piston 8 eccentrically rotatably incorporated in the cylinder hole 7a, and a crankshaft 9 having an eccentric shaft portion for rotationally driving the piston 8 and having an axis X extending in the horizontal direction, and has a function of compressing refrigerant gas.

[0021] The electric element 6 for driving the crankshaft 9 is similar to an electric motor and has a rotor 10 and a stator 11.

[0022] The housing of this compressor 1 is a main body housing 2 formed of a bottomed cylindrical body with an open rear end, which houses the compression mechanism portion 5 and the electric element 6, and a cup-shaped lid body 3 fixed to the rear end portion of the cylindrical body, and is configured as a sealed container 4. The hexagonal flange 2a of the main body housing 2 and the hexagonal flange 3a of the lid body 3 are integrally connected by bolt connection (see FIGS. 4 and 6).

[0023] In the compression mechanism portion 5, a vane member 13 is slidably mounted in a holding portion 12 formed at the lower end portion of the cylinder 7. The vane member 13 is biased toward the piston 8 by a compression spring 14, and the tip of the vane member 13 is always in sliding contact with the peripheral surface of the piston 8. The cylinder hole 7a is partitioned into a compression working chamber 15 for compressing refrigerant gas by the vane member 13 and a discharge working chamber 16 for discharging the compressed liquid refrigerant.

[0024] In the right-side portion near the lower end of the cylinder 7, a pre-discharge chamber 17, a valve member 18 for closing the discharge working chamber 16, and a receiving plate 19 for receiving the valve member 18 in the open position are provided.

[0025] As shown in FIGS. 1 to 6, a partition member 20 is provided to partition the internal space of the sealed container 4 into the main body housing 2 side and the lid body 3 side. This partition member 20 includes a flat plate portion 20a orthogonal to the crankshaft 9, a bearing portion 20c formed in a cup shape at the central portion of this flat plate portion 20a to support the end portion of the crankshaft 9, a cylindrical portion 20b formed in a cylindrical shape along the inner surfaces of the main body housing 2 and the lid body 3, and a passage forming portion 20d formed thickly at the lower end portion of the cylindrical portion 20b.

[0026] The cylindrical portion 20b of the partition member 20 is disposed on the inner surface side of a butting portion 21 where the rear end surface of the main body housing 2 and the front end surface of the lid body 3 are butted together. On the cylindrical portion 20b of this partition member 20, a main body side seal portion 22 for sealing the inner surface of the main body housing 2 with an O-ring and a lid body side seal portion 23 for sealing the inner surface of the lid body 3 with an O-ring are formed.

[0027] The partition member 20 is positioned by having a part of the front end portion of the cylindrical portion 20b received by the cylinder 7 and locking a step portion 24 formed at the rear end portion of the cylindrical portion 20b with a step portion 25 of the lid body 3.

[0028] An introduction pipe connection portion 26 formed at the upper part of the rear end portion of this rotary compressor 1 is connected to an introduction pipe 27 through which refrigerant gas is introduced. The refrigerant gas introduced from the introduction pipe 27 is introduced from a refrigerant passage 28 formed in the wall portion of the lid body 3 into the space portion 29 inside the partition member 20 and the lid body 3. A storage portion 31 for storing a refrigerating machine oil 30 for lubricating the compression mechanism portion 5 is provided at the lower part of the above-mentioned space portion 29.

[0029] The refrigerant gas introduced into the space portion 29 passes through the refrigerant passage 32b formed in the flat plate portion 20a of the partition member 20 from the inlet hole 32a at the upper end of the partition member 20, and is introduced into the refrigerant passage 33 formed in the passage forming portion 20d of the cylindrical portion 20b of the partition member 20, and is introduced into the compression working chamber 15 from the refrigerant passage 33 through the vertically oriented refrigerant suction port 34 formed at the lower end portion of the cylinder 7. Further, a thin communication hole 35 for supplying the refrigerating machine oil 30 stored in the storage portion 31 to the refrigerant passage 33 is formed in the rear end wall portion of the passage forming portion 20d. The lubricating oil is supplied to the compression working chamber 15 together with the refrigerant gas from the refrigerant suction port 34.

[0030] Further, a discharge pipe 37 for discharging the compressed liquid refrigerant is vertically connected to the discharge pipe connection portion 36 formed at the upper end portion in the middle of the front-rear direction of the rotary compressor 1. The aforementioned pre-discharge stage chamber 17 is connected to a refrigerant passage 38 that communicates with the discharge pipe 37 through a refrigerant passage (not shown) formed in the compression mechanism portion 5, and the liquid refrigerant discharged from the discharge working chamber 16 is supplied to the discharge pipe 37.

[0031] The operation and effects of the rotary compressor 1 described above will be described. The sealed container 4 is constituted by the main body housing 2 and the cup-shaped lid body 3 fixed to the end portion thereof, and a partition member 20 for partitioning the internal space of the sealed container 4 into the main body housing 2 side and the lid body 3 side is provided. The partition member 20 is provided with a main body side seal portion 22 for sealing the inner surface of the main body housing 2 and a lid body side seal portion 23 for sealing the inner surface of the lid body 3. Therefore, the partition member 20 can have a partitioning function for partitioning the internal space of the sealed container 4 and a sealing function for sealing two locations, namely, the inner surface of the main body housing 2 and the inner surface of the lid body 3, and it is possible to reduce the number of parts and cut costs.

[0032] Moreover, since two locations, namely, the inner surface of the main body housing 2 and the inner surface of the lid body 3, are sealed, the reliability of the sealing function can be enhanced. Since the partition member 20 is provided with a bearing portion 20c that supports the end portion of the crankshaft 9, by providing the bearing portion 20c on the partition member 20 fixed inside the sealed container 4, the accuracy of the axial center position of the bearing can be improved, and the partition member 20 can be effectively utilized.

[0033] The partition member 20 and the inner space portion 29 of the lid body 3 are configured such that the refrigerant gas returns, and a refrigerant gas storage portion for storing the refrigerant gas can be formed in the inner space portion 29 of the partition member 20 and the lid body 3. Moreover, a storage portion 31 for the refrigerating machine oil 30 can be formed at the lower portion of the space portion 29.

[0034] There is an inlet 32a for the refrigerant gas at the upper portion of the partition member 20, and a refrigerant passage 32b that extends downward from the inlet 32a inside the partition member 20 is provided and is connected to the refrigerant suction port 34 of the compression mechanism portion 5 via the refrigerant passage 33. Therefore, the inlet 32a for the refrigerant gas and the refrigerant passages 32b and 33 are formed in the partition member 20, and the refrigerant gas can flow from the refrigerant passage 33 to the refrigerant suction port 34 of the compression mechanism portion 5. In this way, the refrigerant passages 32b and 33 can be formed by effectively utilizing the partition member 20.

[0035] Since it is provided with a communication hole 35 for communicating the refrigerant passage 33 and the storage portion 31, the refrigerating machine oil 30 stored in the storage portion 31 can be supplied to the compression mechanism portion 5. Note that the embodiments described above are merely examples, and those skilled in the art can implement them in various modified forms.

Explanation of Reference Numerals

[0036] 1 Rotary Compressor 2 Main Body Housing 3 Lid Body 4 Sealed Container 5 Compression Mechanism Portion 6 Electric Element 7 Cylinder 8 Piston 9 Crankshaft 20 Partition Member 20c Bearing Portion 22 Main Body Side Seal Portion 23 Cover-side seal part 29 Space part 30 Refrigerating machine oil 31 Storage part 32a Inlet 32b Refrigerant passage 34 Refrigerant suction port 35 Communication hole

Claims

1. A rotary compressor having a cylinder, an annular piston that eccentrically rotates within the cylinder, and a crankshaft that rotationally drives the piston, a compression mechanism for compressing refrigerant gas, an electric element for driving the crankshaft, and a main body housing that houses the compression mechanism and the electric element, wherein the axis of the crankshaft extends in the horizontal direction, and the main body housing is a bottomed cylindrical body with an open end, and a sealed container is formed by the main body housing and a cup-shaped lid fixed to the end of the cylindrical body. A partition member is provided to partition the internal space of the sealed container into the main body housing side and the lid side, the partition member includes a main body side seal portion that seals the inner surface of the main body housing and a lid side seal portion that seals the inner surface of the lid. The rotary compressor is characterized by this.

2. The rotary compressor according to claim 1, wherein the partition member includes a bearing portion that supports an end portion of the crankshaft.

3. The rotary compressor according to claim 1 or 2, wherein the partition member and the inner space of the lid portion are configured such that refrigerant gas returns, and a storage portion for refrigeration oil is provided at the lower part of the space portion.

4. The rotary compressor according to claim 3, wherein there is a refrigerant gas inlet at the upper part of the partition member, and a refrigerant passage extending downward from the inlet through the inside of the partition member is provided and connected to the refrigerant suction port of the compression mechanism.

5. The rotary compressor according to claim 4, further comprising a communication hole for communicating the refrigerant passage and the storage portion.

Images