JP2001263279A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of generating re-expansion loss to reduce an efficiency of a compressor by reverse flow of coolant at the time of communicating with a suction chamber 12 through a cutout part 2b of a cylinder 2, since a discharge hole 7a is formed as a wasteful space in a compression chamber 11 and compressed coolant remains after a delivery stroke is completed, in a conventional sealed rotary compressor. SOLUTION: The delivery hole 7a, a delivery valve 14, and a surface for arranging it are arranged on a position not overlapped with an inner diameter of a cylinder 2, and thereby, wall thickness of the delivery hole 7a and a valve arranging surface 15 are thinned, a structure for hardly leaving the compressed coolant in the delivery hole 7a is formed. Reverse flow toward the suction chamber 12 is suppressed to the minimum, and thereby it is possible to reduce loss caused by re-expansion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary compressor.

[0002]

2. Description of the Related Art Conventionally, chlorodifluoromethane (for example, Freon 22, etc .; hereinafter referred to as Freon 22) has been generally used as a refrigerant used in a refrigerating apparatus such as a room air conditioner. However, in recent years, Freon 22
Has destroyed the ozone layer in the stratosphere, which has led to global warming.

[0003] Under such circumstances, for example, R410A, which is a mixed refrigerant of HFC32 and HFC125, is being studied as a refrigerant replacing the chlorofluorocarbon 22.

[0004]

The mixed refrigerant R41
When 0A is used for a general rotary compressor described in, for example, JP-A-62-67292, the discharge pressure in the closed container becomes larger than the pressure in the cylinder and covers the cylinder. The bearing may lose the discharge pressure and deform inside the cylinder. When the bearing is deformed inside the cylinder, the gap between the roller eccentrically moving in the cylinder and the bearing disappears, and there is a possibility that abrasion due to metal contact may occur.

An object of the present invention is to provide an R4 having a high discharge pressure.
An object of the present invention is to provide a rotary compressor in which a sub bearing does not deform even when a 10A refrigerant is used.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a shaft which is rotated by an electric element in a container, a roller which operates by rotation of the shaft, a cylinder in which the roller is housed, and which follows the operation of the roller. In a rotary compressor having a blade that separates the interior of the cylinder into a suction chamber and a compression chamber, and a bearing that closes the cylinder and supports the shaft, a part of the bearing protrudes toward the inner wall of the container. This is achieved by providing a discharge hole communicating with the compression chamber and a discharge valve closing the discharge hole in the protruding portion.

The bearing comprises a first bearing for supporting a central portion of the shaft, and a second bearing for supporting one end of the shaft, and the second bearing is provided with a protruding portion. This is achieved by providing a discharge hole communicating with the compression chamber and a discharge valve closing the discharge hole in the protruding portion.

Also, a shaft rotated by an electric element in the container, a roller operated by the rotation of the shaft, a cylinder in which the roller is housed, and a suction chamber that follows the operation of the roller and compresses the inside of the cylinder into a suction chamber. In a rotary compressor having a blade that separates into a chamber and a bearing that closes the cylinder and supports the shaft, a flat plate is provided between the bearing and the cylinder, and a part of the flat plate is directed toward the inner wall of the container. This is achieved by providing a discharge hole communicating with the compression chamber and a discharge valve closing the discharge hole.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A general rotary compressor is shown in FIG.
6 and 7. 5 is a longitudinal sectional view of a general rotary compressor, FIG. 6 is a sectional view taken along line AA of FIG. 5, and FIG. 7 is a partial sectional view of an auxiliary bearing.

[0010] In FIG.
The stator 2 is fixed. On the inner surface of this stator 2,
The rotors 3 are arranged at predetermined intervals. The stator 2 and the rotor 3 constitute an electric motor unit. The rotor 3 is fixed to a crankshaft 4.

Reference numeral 5 denotes a cylinder fixed to the inner wall of the closed container 1. Inside the cylinder 5, there is a crankshaft 4
Is located, and the crank portion 4a has
The roller 6 is inserted. Reference numeral 7 denotes a main bearing that covers an upper portion of the cylinder 5 and supports a central portion of the crankshaft 4. Reference numeral 8 denotes an auxiliary bearing, which covers a lower portion of the cylinder 5 and supports a lower portion of the crankshaft 4. 8 a is a discharge hole provided in the sub bearing 8. The discharge hole 8a communicates the inside of the cylinder 5 with the inside of the closed container 1. A discharge valve 9 opens and closes the discharge hole 8a. The discharge valve 9 is provided on the valve installation surface 8 of the sub bearing 8.
b. Reference numeral 10 denotes a cover that covers the discharge hole 7a of the sub bearing 7. Reference numeral 11 denotes lubricating oil stored at the bottom of the closed container 1.

In FIG. 6, reference numeral 12 denotes a blade.
The tip of the blade 12 is always in contact with the side surface of the roller 6 eccentrically moving in the cylinder 5 by the rotation of the crankshaft 4. 5b is a groove provided in the cylinder 5, into which the blade 12 is inserted. 12a is
A spring for constantly pressing the blade 11 against the side surface of the roller 6. 5a is a notch provided in the compression chamber 5d of the cylinder 5. The notch 5a is a part for guiding the refrigerant to the discharge hole 8a side. 5c is a suction chamber, and 5e is a suction hole for sucking the refrigerant flowing from the piping side of the refrigeration cycle (not shown).

The interior of the cylinder 5 is partitioned by a blade 12 into a suction chamber 5c and a compression chamber 5d. When the roller 6 rotates in the direction of the arrow due to the rotation of the crankshaft 4, the volume of the suction chamber 5c gradually expands, so that the refrigerant is sucked from the suction hole 5e, and
When the pressure in the compression chamber 5d reaches a predetermined pressure, the discharge valve (not shown) opens, and the refrigerant is discharged into the closed container 1. The refrigerant gas discharged into the closed container 1 flows to the refrigeration cycle.

The auxiliary bearing 8 attached to the cylinder 5 shown in FIG. 6 is manufactured by casting and then by machining.
For grinding, it is most efficient to rotate the workpiece and grind it. For a general auxiliary bearing, the portion that closes the cylinder is circular. Therefore, the discharge hole and the discharge valve must be mounted within the range of the circular portion closing the cylinder.

In FIG. 7, reference numeral 13 denotes a valve opening regulating plate for regulating the opening of the discharge valve 9. This restriction plate 13
Together with the discharge valve 9, it is fixed to the valve installation surface 8 b of the sub bearing 8.

As described above, when the R410A refrigerant is used in this rotary compressor, the discharge pressure in the sealed container 1 becomes higher than the pressure in the cylinder 5, and the auxiliary bearing 8 is deformed inside the cylinder 5, so that the roller The gap between the bearing 6 and the sub-bearing 8 becomes small, and there is a possibility of causing wear due to metal contact. Therefore, when using R410A refrigerant,
It is necessary to increase the thickness of the entire sub bearing 8 to reinforce the discharge hole 8a and the valve installation surface 8b. However, if the thickness of the sub bearing 8 is increased, the discharge hole 8a becomes deep. When the discharge hole 8a becomes deeper, the discharge hole 8a is closed by the discharge valve 9 in the state where the discharge process from the compression chamber 5d is completed, and the inside of the cylinder 5 is closed by the roller 6, so that the discharge hole 8a has a depth corresponding to the depth of the discharge hole 8a. The discharge gas remains in the space of only one and the space of the notch 5a. When the suction step is started with the discharge gas remaining, the suction chamber 5c communicates with the discharge hole 8a and the notch 5a, and the discharge gas flows back into the suction chamber 5c and expands in the suction chamber 5c. Will be lost.

According to the present invention, an auxiliary bearing suitable for using the R410A refrigerant in the general rotary compressor is provided in the rotary compressor.

An embodiment of the present invention will be described with reference to FIGS. In the figure, the same reference numerals as those in FIGS. 5 to 7 which describe the general rotary compressor are the same, and the description thereof will be omitted.

FIG. 1 is a longitudinal sectional view of a rotary compressor provided with the present invention, FIG. 2 is a sectional view taken along the line BB of FIG. 1, and FIG.
It is principal part sectional drawing of an auxiliary bearing.

In FIG. 1, a discharge hole 8a according to the present invention is shown.
The arrangement of the discharge valve 9 will be described.

A part or the whole of the sub-bearing 8 is enlarged in the radial direction until it comes close to the inner wall of the closed casing 1 so as to be thin. A discharge hole 8 is provided in the portion enlarged in the radial direction.
a and the valve installation surface 8b. The discharge hole 8a and the valve installation surface 8b are arranged at positions close to the inner wall of the closed casing 1 so as not to cover the inner diameter of the cylinder 5. The notch 5a is provided so that the inside of the cylinder 5 and the discharge hole 8a communicate with each other. The valve mounting surface 8b is fixed so as to be in close contact with a protruding portion of the cylinder 5, which is a mounting portion of the blade 12.

In FIG. 2, the discharge valve 9 and the valve opening regulating plate 13 are fixed to the valve installation surface 8b with rivets 15.

During operation of the compressor, the discharge port 8a and the valve installation surface 8b
Although the discharge pressure in the sealed container 1 is applied to the sub bearing 8 provided with the cylinder, the deformation can be prevented because the sub bearing 8 is disposed on the surface of the cylinder 2, and the thickness of the valve installation surface 15 can be reduced. Can be done.

Since the volume in the discharge hole 8a can be reduced by the reduction in the thickness of the valve installation surface 8b, the residual amount of the refrigerant at the discharge pressure after the completion of the discharge process is reduced, and the suction chamber 5
c, the amount of refrigerant flowing back to the suction chamber 5c can be reduced.
The re-expansion loss in the inside can be reduced, and the efficiency of the compressor can be increased.

Further, even if a high pressure is applied to the valve installation surface 8b by the R410A refrigerant, the cylinder is in close contact with the plane portion of the cylinder 5, so there is no deformation, and the metal contact between the roller 6 and the sub bearing 8 is eliminated. The reliability of the compressor is improved. In this embodiment, the discharge valve 9 is provided on the sub-bearing 8, but there is no problem if it is provided on the main bearing 7.

Next, another embodiment will be described with reference to FIG. FIG. 4 is a sectional view of a main part of a sub bearing provided with another embodiment.

In FIG. 4, the auxiliary bearing 8 has substantially the same size as the auxiliary bearing 8 described in FIG. A thin plate 14 made of a sintered material or the like is interposed between the mounting surfaces of the sub bearing 8 and the cylinder 5. The thin plate 14 extends in the radial direction in a direction approaching the inner wall of the closed container 1. Further, a discharge hole 14a is formed in the thin plate 14, and a discharge valve 9 for opening and closing the discharge hole 14a is attached.
Reference numeral 13 denotes an opening regulating plate for the discharge main valve 9, which prevents breakage due to the valve 9 being opened too much. Reference numeral 15 denotes a rivet which sandwiches the valve 9 between the thin plate 14 and the valve opening regulating plate 13,
It is fixed.

According to the present embodiment, the thin plate 14 is merely attached to the sub-bearing 8 used for a general rotary compressor without expanding the sub-bearing 8 in the radial direction. You can place an amount of. However, it is necessary to provide a thin plate 16 for mounting the valve 14, but it can be easily manufactured only by processing a flat plate such as a sintered material.

[0029]

According to the present invention, it is possible to provide a rotary compressor in which bearings are not deformed even with respect to a refrigerant having a high discharge pressure such as R410A.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic rotary compressor provided with the present invention.

FIG. 2 is a cross-sectional view taken along the arrow B-B of FIG. 1;

FIG. 3 is a sectional view of a main part of a sub bearing.

FIG. 4 is a sectional view of a main part of a sub bearing provided with another embodiment.

FIG. 5 is a longitudinal sectional view of a general rotary compressor.

FIG. 6 is a sectional view taken along the line AA of FIG. 5;

FIG. 7 is a sectional view of a main part of a general auxiliary bearing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Stator, 3 ... Rotor, 4 ... Crankshaft, 6 ... Roller, 7 ... Cylinder, 8 ... Sub bearing, 9 ... Discharge valve, 10 ... Discharge cover, 11 ... Refrigerator.

Claims (3)

[Claims] 1. A shaft rotated by an electric element in a container, a roller operated by the rotation of the shaft, a cylinder in which the roller is housed, and a suction chamber which follows the operation of the roller and forms a suction chamber in the cylinder. In a rotary compressor having a blade that separates into a chamber and a bearing that closes the cylinder and supports the shaft, a part of the bearing protrudes toward the inner wall of the container, and the protrusion communicates with the compression chamber. Rotary compressor provided with a discharge hole for closing the discharge hole and a discharge valve for closing the discharge hole. 2. The bearing according to claim 1, wherein said bearing comprises a first bearing for supporting a central portion of said shaft, and a second bearing for supporting one end of said shaft. 2. The rotary compressor according to claim 1, wherein a discharge hole communicating with the compression chamber and a discharge valve closing the discharge hole are provided in the protrusion. 3. A shaft rotated by an electric element in a container, a roller operated by the rotation of the shaft, a cylinder in which the roller is housed, and a suction chamber which follows the operation of the roller and compresses the inside of the cylinder. In a rotary compressor having a blade that separates into a chamber and a bearing that closes the cylinder and supports the shaft, a flat plate is provided between the bearing and the cylinder, and a part of the flat plate is directed toward the inner wall of the container. A rotary compressor having a projection provided with a discharge hole communicating with the compression chamber, and a discharge valve closing the discharge hole.