JP2013007296A - Multi-cylinder rotary compressor and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-cylinder rotary compressor and a method of manufacturing the same unnecessary to fasten divided plates to each other with a connecting member even in the case wherein a partition plate is divided and, as a result, capable of omitting a complicated manufacturing process necessary to fasten the divided plates.SOLUTION: A projection 45 is formed in a crimped surface of any one of two divided plates structuring the partition plate and cylinder blocks 40a, 40b. In a process for assembling a compression chamber, the partition plate 41 and the cylinder blocks 40a, 40b are crimped to each other so that a recessed part 46 formed into a shape to be engaged with the projection 45 is formed in the other crimped surface.

Description

  The present invention relates to a multi-cylinder rotary compressor provided with a partition plate composed of two divided plates and a method for manufacturing the multi-cylinder rotary compressor.

Conventionally, a partition plate for a compressor that can be assembled by dividing a partition plate that divides a plurality of compression chambers into two divided plates, sandwiching the crankshaft from the left and right with this divided plate, and fastening with a connecting member has been proposed. Has been.
As a multi-cylinder rotary compressor that is easy to assemble with this partition plate and has little refrigerant leakage, for example, a multi-cylinder rotary compressor and a method of manufacturing a multi-cylinder rotary compressor as disclosed in Patent Document 1 have been proposed. ing.

Japanese Patent Laid-Open No. 54-121405 (page 2, lines 16 to 45, FIGS. 2 and 3)

In the conventional multi-cylinder rotary compressor, the partition plate is displaced due to the sliding of the roller during the operation of the compressor, and a gap is generated in the split surface of the partition plate composed of two split plates, so that the refrigerant leaks. The performance of the compressor was degraded.
In order to prevent this, measures have been taken to prevent gaps from being generated on the split surfaces of the partition plates by fastening the split plates together with a connecting member or the like.
However, in such a compressor, it is necessary to provide a fastening part for fastening with another split plate on the split plate and to perform complicated processing such as screw hole processing for the connecting member, and when assembling the compressor However, since it is necessary to provide a complicated sub-manufacturing process for fastening the divided plates, there is a problem that the cost is high and the production efficiency is poor.

  The present invention has been made to solve the above-described problems. Even when the partition plate is divided, it is not necessary to fasten the split plate with a connecting member or the like, and the complicated manufacturing necessary for fastening the split plate. An object of the present invention is to provide a multi-cylinder rotary compressor with high production efficiency, low cost, and high performance, which can omit the process, and a method for manufacturing the multi-cylinder rotary compressor.

A multi-cylinder rotary compressor according to the present invention includes:
A plurality of cylinder blocks;
A compression chamber formed in the cylinder block;
In a multi-cylinder rotary compressor that is composed of two divided plates and is fixed with bolts between cylinder blocks and provided with a partition plate that partitions adjacent compression chambers,
It has a convex part in the crimping | compression-bonding surface of any one of the partition plate and cylinder block which mutually crimps | bond.

The manufacturing method of the multi-cylinder rotary compressor according to the present invention is as follows:
A plurality of cylinder blocks;
A compression chamber formed in the cylinder block;
In a method of manufacturing a multi-cylinder rotary compressor, which is composed of two divided plates, and includes a partition plate that is fixed with bolts between cylinder blocks and partitions adjacent compression chambers,
A convex part is formed on the crimping surface of either the partition plate or the cylinder block,
By compressing the partition plate and the cylinder block, there is a compression chamber assembling step in which a recess having a shape that meshes with the protrusion is formed on the other crimping surface.

A multi-cylinder rotary compressor according to the present invention includes:
Since one of the crimping surfaces of the partition plate and the cylinder block that are pressure-bonded to each other has a convex portion, it is possible to prevent a gap from being generated on the split surface even if the split plates are not fastened with a connecting member or the like. Therefore, it is possible to provide a multi-cylinder rotary compressor with high production efficiency, low cost and high performance.

The manufacturing method of the multi-cylinder rotary compressor according to the present invention is as follows:
A convex part is formed on the crimping surface of either the partition plate or the cylinder block,
Because it has a compression chamber assembly process that forms a concave part meshing with the convex part on the other crimping surface by crimping the partition plate and the cylinder block,
Provided is a method for manufacturing a multi-cylinder rotary compressor that can prevent a gap from being formed on the dividing surface without fastening the divided plates with a connecting member or the like, and can eliminate a complicated sub-assembly process necessary for fastening. can do.

1 is a longitudinal sectional view of a multi-cylinder rotary compressor according to Embodiment 1 of the present invention. 1 is a cross-sectional view of a multi-cylinder rotary compressor according to Embodiment 1 of the present invention. It is a top view which shows the partition plate comprised by the two division plates which concern on Embodiment 1 of this invention. It is a figure which shows the example of the shape of the convex part provided in the crimping | compression-bonding surface of the partition plate which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the shape of the convex part provided in the crimping | compression-bonding surface of the partition plate which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows engagement of the convex part of the partition plate which concerns on Embodiment 1 of this invention, and the recessed part of a cylinder crimping | compression-bonding surface. It is a schematic diagram which shows engagement of the convex part of the cylinder crimping | compression-bonding surface which concerns on Embodiment 2 of this invention, and the recessed part of a partition plate.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIG.
FIG. 1 is a longitudinal sectional view of a multi-cylinder rotary compressor 100.
2 is a cross-sectional view taken along line AA of the multi-cylinder rotary compressor 100 of FIG.
In the present embodiment, a two-cylinder rotary compressor for a refrigeration / air conditioner having two compression chambers will be described as an example.

  The multi-cylinder rotary compressor 100 includes a shell 1 that is a sealed container, a motor 2 that is a drive source installed in the shell 1, and a compression mechanism unit 3 that is also installed in the shell 1. A discharge pipe 4 for discharging the compressed refrigerant to the outside of the compressor is provided on the upper portion of the shell 1. A motor 2 and a compression mechanism unit 3 are fixed to a shell intermediate portion of the shell 1, and a suction pipe 5 that guides the refrigerant to the compression mechanism unit 3 is fixed.

  The motor 2 has a stator 2 a and a rotor 2 b, and the rotor 2 b is attached to the crankshaft 6. The rotational torque generated by the motor 2 is transmitted to the compression mechanism unit 3 through the crankshaft 6.

The compression mechanism unit 3 includes a crankshaft 6, a first frame 31a, a first cylinder block 40a, a first spring 8, a first vane 9, a first roller 32a, a partition plate 41, a second cylinder block 40b, and a second frame. It has a body 31b, a second spring, a second vane, and a second roller 32b.
And the short volt | bolt 13 and the long volt | bolt 14 are penetrated to the through-hole provided in each of the 1st frame 31a, the 2nd frame 31b, the 1st cylinder block 40a, the 2nd cylinder block 40b, and the partition plate 41. By fastening the bolts, these components constituting the compression mechanism unit 3 are fixed by pressure bonding.

  The crankshaft 6 includes a rotor fitting portion 61, a first bearing insertion portion 62a, a first eccentric portion 63a, an intermediate portion 64, a second eccentric portion 63b, and a second bearing insertion portion 62b. The first eccentric portion 63a and the second eccentric portion 63b are different in the eccentric phase by 180 degrees, and the first roller 32a and the second roller 32b are mounted on the respective outer peripheral surfaces.

A space surrounded by the lower surface of the first frame 31a, the inner peripheral surface of the first cylinder block 40a, the upper surface of the partition plate 41, and the outer peripheral surface of the first roller 32a is the first compression chamber 21a. The space surrounded by the lower surface of the partition plate 41, the inner peripheral surface of the second cylinder block 40b, the upper surface of the second frame 31b, and the outer peripheral surface of the second roller 32b is the second compression chamber 21b.
Thus, the partition plate 41 is disposed between the first cylinder block 40a and the second cylinder block 40b, and plays a role of partitioning the adjacent first compression chamber 21a and second compression chamber 21b.
The first vane 9 and the second vane have a function of dividing the first compression chamber 21 a and the second compression chamber 21 b into a low pressure portion 23 and a high pressure portion 24.

FIG. 3 is a plan view of a partition plate 41 composed of two divided plates 43.
The dividing plate 43 has a semicircular cutout 49 on the dividing surface side, and is assembled so that the intermediate portion 64 of the crankshaft 6 is sandwiched by the cutout 49 from the left and right to form the partition plate 41.
And it has the minute convex part 45 (it shows by x) in the area | region used as the crimping | compression-bonding surface with the 1st cylinder block 40a and the 2nd cylinder block 40b near the edge of the through-hole 44 for the long volt | bolts 14. FIG.
The convex portion 45 may be slightly deformed by simple processing such as laser welding or punching of a tool such as a punch.

4 and 5 are diagrams illustrating examples of the shape of the convex portion 45 provided on the pressure-bonding surface of the partition plate.
The convex portion 45 may have a mountain shape as shown in FIG. 4 or a shape having a depression in a part as shown in FIG.

Next, the assembly process of the compression mechanism part 3 is demonstrated using FIG.
First, the first frame body 31a and the first cylinder block 40a, and the second frame body 31b and the second cylinder block 40b are respectively positioned and fixed with the short bolts 13, thereby producing a subassembly.
Next, a sub-assembly of the first frame body 31a and the first cylinder block 40a is installed with the first frame body 31a facing down, and the first roller 32a and the first vane 9 are set in the first cylinder block 40a. Thereafter, the crankshaft 6 is set to the first frame 31a through the first cylinder block 40a so that the first roller 32a fits into the first eccentric portion 63a.

Then, with the two divided plates 43 provided with the convex portions 45 in advance, the intermediate plate 64 is sandwiched from the left and right, and the divided plates 43 are in contact with each other so that no gap is formed on the divided surface. The partition plate 41 is formed by temporarily fixing 43 with a simple jig (not shown).
Then, with the second roller fitted to the second eccentric portion 63b of the crankshaft 6 and the second vane fitted into the second cylinder block 40b, the sub-assembly of the second cylinder block 40b and the second frame 31b is cranked. Set on the partition plate 41 through the shaft 6.
Thereafter, the first frame body 31a and the second frame body 31b are positioned, and the first frame body 31a, the second frame body 31b, the first cylinder block 40a, and the second cylinder block that constitute the compression mechanism section 3 with the long bolts 14. 40b and the partition plate 41 are crimped and fastened. Thereafter, the simple jig temporarily fixing the partition plate 41 is removed.

  In this way, the partition plate 41 and the first cylinder block 40a and the second cylinder block 40b installed on the upper and lower sides of the partition plate 41 are pressure-bonded to each other, so that the minute convex portion 45 provided on the partition plate 41 becomes the first cylinder block 40a. Are pressed against a pressure-bonding surface (hereinafter referred to as a cylinder pressure-bonding surface) between the second cylinder block 40b and the partition plate 41, and a minute concave portion 46 having a shape corresponding to the convex portion 45 is formed on the cylinder pressure-bonding surface.

FIG. 6 is a schematic diagram showing the engagement of the convex portion 45 of the partition plate 41 and the concave portion 46 of the cylinder crimping surface.
Hereinafter, the meshing portion of the concave portion 46 and the convex portion 45 is referred to as an uneven meshing portion 47.
Since the concave portion 46 provided on the cylinder crimping surface is formed by crimping with the convex portion 45 provided in advance on the partition plate 41 when the compression mechanism portion 3 is assembled, the positional deviation from the convex portion 45 may occur. And there is no difference in shape, so that the meshing is performed without any looseness as shown in FIG.
This is an effect that cannot be obtained by a method in which the convex portion 45 and the concave portion 46 are separately processed and then meshed.

  The partition plate 41 is preferably made of a material harder than the cylinder block, such as hardened steel. This is because the convex portion 45 made of a material stronger than the cylinder block is pressed against the cylinder block, whereby a firm concave portion 46 is formed on the cylinder block side, and the meshing force becomes strong.

Thus, since the partition plate 41 composed of the two divided plates 43 is fixed by the cylinder block and the concave / convex meshing portion 47 arranged above and below, a fastening portion for fastening the divided plates 43 to each other is provided. Even if it is not provided on the dividing plate 43, it is possible to keep the two dividing plates 43 in contact with each other without a gap.
Therefore, even when a force for shifting the partition plate 41 due to sliding of the rollers during the operation of the compressor (hereinafter referred to as a displacement force) works in the horizontal direction of the partition plate 41, the partition plate 41 is displaced to the divided surface. There is no gap between the refrigerant and the performance of the compressor.

  According to the invention according to the present embodiment, since the uneven engagement portion 47 is provided in the vicinity of the through hole 44 that is the fastening portion of the bolt, the axial force of the bolt acts on the uneven engagement portion 47 without loss, and the partition plate 41 and The engagement between the first cylinder block 40a and the second cylinder block 40b is made stronger.

Further, assuming that the force against the displacement force is the displacement tolerance, the displacement tolerance is the sum of the engagement forces of the individual uneven engagement portions 47. Therefore, the greater the number of the uneven engagement portions 47, the greater the displacement tolerance.
Therefore, it is possible to easily design the displacement proof strength larger than the displacement force by adjusting the number of the concave-convex engagement portions 47.
In addition, the number and position of the convex part 45 shown to a figure are an example, and do not limit the content of this invention.

  In addition, conventionally, by increasing the axial force of the bolt that fastens the compression mechanism, the crimping force between the partition plate and the cylinder block is increased to increase the frictional force on the crimping surface and prevent the partition plate from shifting. This measure was used as a measure to prevent misalignment that can be carried out relatively easily. However, in the abnormal operation state called vacuum operation mode, the frictional force between the cylinder block and the partition plate is greatly reduced. It wasn't.

The vacuum operation mode is an abnormal operation state that occurs when the compressor is operated when the upstream side of the refrigerant flow path of the compressor is blocked for some reason, and compression is performed in order to continue compression without refrigerant being sucked. A state in which the interior of the room is partially close to a vacuum.
At this time, since the sliding part of the roller and the vane is not cooled by the refrigerant, the roller is overheated and thermally expanded more than during normal operation, and the first frame body and the second frame body are respectively moved in the axial direction of the crankshaft. By pushing up and down, the axial force of the bolt is concentrated on the roller, and the partition plate and the cylinder block are slightly separated to reduce the frictional force.

In order to prevent the frictional force drop due to the separation between the partition plate and the cylinder block, by providing a clearance with a small difference between the roller thickness and the cylinder block thickness, the axial force of the bolt due to the expansion of the roller is dispersed. Although it is possible to reduce, the clearance between the roller and the cylinder block increases as the clearance increases, resulting in a trade-off relationship that the performance decreases.
In addition, as another countermeasure for preventing the slippage of the partition plate in this vacuum operation mode, the current flowing to the motor increases in the vacuum operation mode, so that this overcurrent is detected and the operation of the compressor is stopped. There is also. However, since the partition plate may be displaced before the operation is stopped, this is not a reliable measure for preventing the partition plate from being displaced.

  Therefore, in the invention of the present embodiment, by appropriately adjusting the heights of the convex portions 45 of the partition plate and the concave portions 46 of the first cylinder block 40a and the second cylinder block 40b, the space between the partition plate 41 and the cylinder block is adjusted. Even when the frictional force is reduced due to a slight separation, the engagement of the concave-convex engagement portion 47 is maintained, so that it is possible to prevent the partition plate 41 from being displaced even when the frictional force is reduced.

The concave-convex meshing portions of the multi-cylinder rotary compressor according to the present embodiment are arranged above and below the dividing plates 43 in a state where the dividing plates 43 provided with minute convex portions 45 are brought into contact with each other so that no gap is generated. The first cylinder block 40a and the second cylinder block 40b are assembled by pressure bonding, and the concave portions 46 that mesh with the convex portions 45 are formed on the pressure bonding surfaces of the first cylinder block 40a and the second cylinder block 40b. Even when a force for shifting the plate 41 is applied, the partition plate 41 is not displaced and a gap is formed on the dividing surface, and the refrigerant leaks and the performance of the compressor does not deteriorate.
Therefore, even when the partition plate is divided into two divided plates, it is not necessary to fasten the divided plates 43 with a connecting member or the like.
As a result, it is not necessary to provide a fastening part for fastening the split plate on the split plate to perform complicated processing for the connecting member, and the complicated sub-assembly process required for fastening the split plate can be omitted. A high-performance multi-cylinder rotary compressor and a method for manufacturing the same can be provided.

Embodiment 2. FIG.
In the following, the second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 7 is a schematic diagram showing meshing of the convex portion 245 provided on the cylinder crimping surface and the concave portion 246 of the partition plate 241.
In the first embodiment, the minute projections 45 are provided on the partition plate 41, but in the present embodiment, the minute projections 245 are formed in the first cylinder block 240a and the second cylinder block 240b.

First, before assembling the compressor, the first cylinder block 240a and the second cylinder block 240b are slightly protruded in the vicinity of the edges of the through holes 244a and 244b for the long bolts 14 and the area to be the crimping surface with the partition plate 241. A portion 245 is provided.
Then, when the compression mechanism is assembled, the partition plate 241 and the first cylinder block 240a and the second cylinder block 240b are pressure-bonded and fixed with bolts, thereby forming a minute recess 246 in the partition plate 241 and the uneven engagement portion 247. To form.

In this manner, the first cylinder block 240a and the second cylinder block 240b in which the minute convex portions 245 are formed in advance are pressure-bonded to the partition plate 241 in a state in which the two divided plates are in contact with each other so that no gap is generated. Since the concave portion 246 that is assembled and meshed with the convex portion 245 is formed on the pressure-bonding surface of the partition plate 241, even when a force for shifting the partition plate 241 is applied, the partition plate 241 is displaced to create a gap on the split surface, and the refrigerant leaks. Therefore, the performance of the compressor will not deteriorate.
Therefore, even when the partition plate is divided into two divided plates, there is no need to fasten the divided plates with a connecting member, etc., and a high-performance, inexpensive and high-performance multi-cylinder rotary compressor and a manufacturing method thereof are provided. can do.

Moreover, when forming the convex part 245 in the 1st cylinder block 240a and the 2nd cylinder block 240b side, it has the convex part 245 only in the surface by which the partition plate 241 is crimped | bonded among the upper and lower surfaces of a cylinder block. Become.
Therefore, in the compressor assembly process, etc., the surface that does not have the convex portion 245 is transported downward, so that the surface on which the convex portion 245 is formed touches an object such as a pallet and the convex portion 245 is damaged. This has the advantage that it can be prevented.

40a, 240a first cylinder block, 41, 241 partition plate,
40b, 240b 2nd cylinder block, 43 dividing plate,
44, 244a, 244b through hole, 45, 245 convex portion, 46, 246 concave portion,
47,247 Uneven engagement portion, 100 Multi-cylinder rotary compressor.

Claims (6)

A plurality of cylinder blocks;
A compression chamber formed in the cylinder block;
In a multi-cylinder rotary compressor that is composed of two divided plates and is fixed with bolts between the cylinder blocks, and a partition plate that partitions the adjacent compression chambers,
A multi-cylinder rotary compressor having a convex portion on one of the pressure-bonding surfaces of the partition plate and the cylinder block that are pressure-bonded to each other. 2. The multi-cylinder rotary compressor according to claim 1, wherein one material of the partition plate or the cylinder block provided with the convex portion is relatively stronger than the other material. The multi-cylinder rotary compressor according to claim 1, wherein the convex portion is provided in the vicinity of an edge of the through hole for the bolt. The multi-cylinder rotary compressor according to any one of claims 1 to 3, wherein the convex portion is provided on the partition plate, and a material of the partition plate is hardened steel. A plurality of adjacent cylinder blocks;
A compression chamber formed in the cylinder block;
In a method of manufacturing a multi-cylinder rotary compressor, which is composed of two divided plates, and includes a partition plate that is fixed by bolts between the cylinder blocks and partitions adjacent compression chambers.
A convex part is formed on the pressure-bonding surface of one of the partition plate and the cylinder block,
A method of manufacturing a multi-cylinder rotary compressor having a compression chamber assembling step in which a concave portion meshing with the convex portion is formed on the other crimping surface by crimping the partition plate and the cylinder block. The method for manufacturing a multi-cylinder rotary compressor according to claim 5, further comprising a convex portion forming step of forming the convex portion by laser processing or punching.

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