JP5679384B2 - Multi-cylinder rotary compressor - Google Patents

Description

  The present invention relates to a multi-cylinder rotary compressor provided with a partition plate having oil holes.

Conventionally, a partition plate that divides a plurality of compression chambers is divided into two divided plates, and a partition plate that can be assembled by sandwiching the crankshaft between the divided plates is easy to assemble and has little refrigerant leakage. As a cylinder rotary compressor, for example, a multi-cylinder rotary compressor as described in Patent Document 1 has been proposed.
The compressor described in Patent Document 1 combines two divided plates having the same shape, and the edge of each mating surface overlaps the sliding portion of the vane that partitions the compression chamber into a low pressure portion and a high pressure portion. (In this document, the direction in which the vane exists is expressed as a crank angle of 0 °).

  According to this document, by setting the mating surface of the two split plates to a crank angle of 0 ° -180 ° and having one end of the mating surface in the refrigerating machine oil, a minute gap inside the mating surface or the cylinder is obtained. Refrigerating machine oil is supplied through the mating surface, so that refrigerant leakage from a minute gap is suppressed and performance can be improved.

The compressor described in Patent Document 2 is a partition plate configured by combining two divided plates, and the two divided plates are bolted with a sealing material interposed between the mating surfaces of the two divided plates. It is characterized by fixing.
According to this document, it is possible to suppress refrigerant leakage from the mating surfaces by interposing a sealing material between the two divided plates.
Further, by fixing the two divided plates with bolts, it is possible to prevent the two components from being displaced due to vibration during operation or the like, and to open a gap in the mating surface.

Japanese Utility Model Publication No. 58-167788 (page 3, line 3, page 4, line 5, FIG. 3) Japanese Patent Laid-Open No. 54-121405 (page 2, lines 16 to 45, FIG. 2)

In the compressor shown in Patent Document 1, since the partition plate is composed of two divided plates, a compression mechanism portion having a large eccentric portion can be employed.
However, if the processing accuracy and assembly accuracy of the parts are taken into consideration, a minute gap of about several μm may occur between the divided plates, and even such a minute gap causes refrigerant leakage, There was a problem that the compression function deteriorated.
For example, when the mating surfaces of the divided plates are polished, there is a possibility that the center portion of the processed portion is bent due to thermal expansion during processing.
In such a case, even if the structure is such that the both ends of the mating surface are fixed with bolts, the periphery of the fixed part can be assembled without any gaps, but a minute gap is still generated near the shaft through hole. Since the end of the gap does not contact the refrigerator oil outside the compression chamber, there is a problem that the refrigerator oil is not supplied and the gap cannot be sealed.
Moreover, in patent document 1, since the horizontal installation type compressor with which a crankshaft becomes a horizontal direction is assumed, it can be set as the structure which has the end of the mating surface of a division | segmentation board in refrigeration oil, In the vertical compressor as described above, the height of the oil level fluctuates depending on the operating state, so that the mating surface is not necessarily in the refrigerating machine oil, and there is a problem that the refrigerating machine oil cannot be supplied.

  Moreover, in the compressor like patent document 2, since it was necessary to pinch | seal a sealing material between mating surfaces, there existed a subject that a number of parts increased and an assembly took time.

  This invention was made in order to solve such a subject, and it aims at provision of the multicylinder rotary compressor which has a partition plate which can suppress the refrigerant | coolant leak from the mating surface of a division plate.

The multi-cylinder rotary compressor according to the present invention is
A plurality of adjacent compression chambers;
In a multi-cylinder rotary compressor that is divided into two divided plates, and includes a partition plate that presses and fixes the mating surfaces of the divided plates to each other and partitions adjacent compression chambers,
The mating surface of at least one of the divided plates has a notch that forms an oil hole in the axial direction of the crankshaft of the compression mechanism,
The oil hole communicates with an oil passage that penetrates the cylinder block of the compression mechanism in the axial direction of the crankshaft.

In the multi-cylinder rotary compressor according to the present invention, at least one divided plate constituting a partition plate that partitions between the plurality of compression chambers,
The mating surface has a notch that forms an oil hole in the axial direction of the crankshaft of the compression mechanism,
Since the oil hole communicates with an oil passage that penetrates the cylinder block of the compression mechanism in the axial direction of the crankshaft, an oil seal is formed between the mating surfaces, and even if a minute gap is generated between the mating surfaces, Leakage can be suppressed.

1 is a longitudinal sectional view of a multi-cylinder rotary compressor according to Embodiment 1 of the present invention. It is sectional drawing in the AA line of the multicylinder rotary compressor which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of the partition plate of the multicylinder rotary compressor which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of the partition plate of the multicylinder rotary compressor which concerns on Embodiment 2 of this invention. It is the top view and side view which show the other structural example of the partition plate of the multicylinder rotary compressor which concerns on Embodiment 1 of this invention. It is a top view which shows the other structural example of the partition plate of the multicylinder rotary compressor which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a multi-cylinder rotary compressor 100 (hereinafter referred to as a compressor 100).
2 is a cross-sectional view taken along line AA of the compressor 100 shown in 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.

First, an outline of the compressor 100 according to the present embodiment will be described.
The motor 2 installed in the shell 1 is driven by energization from the glass terminal portion 7 to rotate the crankshaft 6 having the first eccentric portion 63a and the second eccentric portion 63b.
Then, the refrigerant is sucked into the first compression chamber 21a and the second compression chamber 21b through the suction muffler 8 and the suction pipe 5.
The refrigerant compressed with the rotation of the crankshaft 6 is discharged into the shell 1 from the hole 53 provided in the first discharge muffler 30a and discharged to the outside of the compressor 100 from the discharge pipe 4 at a constant pressure. The

Next, a detailed configuration of the compressor 100 will be described.
The compressor 100 includes a shell 1 that is an airtight container, a motor 2 that is a drive source installed inside the shell 1, and a compression mechanism unit 3 that is also installed inside the shell 1.
The shell 1 includes an upper shell 1a, an intermediate shell 1b, and a lower shell 1c. The upper shell 1a is provided with a discharge pipe 4 for discharging a compressed refrigerant to the outside of the compressor.
A motor 2 and a compression mechanism section 3 are fixed to the intermediate shell 1b, and a suction pipe 5 that guides the refrigerant to the compression mechanism section 3 is fixed.
The suction pipe 5 is connected to a suction muffler 8, and in the suction muffler 8, gas-liquid separation of the refrigerant and removal of dust in the refrigerant are performed.

Power to the motor 2 is supplied from the glass terminal portion 7 provided on the upper shell 1a.
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 3 includes a crankshaft 6, a first discharge muffler 30a, a first frame 31a, a first cylinder block 33a, a first spring 9, a first vane 10, a first roller 32a, a partition plate 35, and a second cylinder. It has a block 33b, a second frame 31b, a second discharge muffler 30b, a second spring, a second vane, and a second roller 32b.
And in the through-hole provided in each of the 1st discharge muffler 30a, the 1st frame 31a, the 1st cylinder block 33a, the partition plate 35, the 2nd cylinder block 33b, the 2nd frame 31b, and the 2nd discharge muffler 30b. These parts constituting the compression mechanism section 3 are fixed by pressure by passing the short bolts 13 and the long bolts 14 and fastening the bolts.

  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 33a, the upper surface of the partition plate 35, and the outer peripheral surface of the first roller 32a is the first compression chamber 21a.
A space surrounded by the lower surface of the partition plate 35, the inner peripheral surface of the second cylinder block 33b, 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 35 is disposed between the first cylinder block 33a and the second cylinder block 33b, and plays a role of partitioning the adjacent first compression chamber 21a and second compression chamber 21b.

The first cylinder block 33a is provided with a slit from the inner peripheral surface to the radially outer side, and the first vane 10 biased by the first spring 9 is mounted therein.
The tip of the first vane 10 abuts on the outer peripheral surface of the first roller 32a mounted around the first eccentric portion 63a, and partitions the first compression chamber 21a into the low pressure portion 23 and the high pressure portion 24.

During operation of the compressor 100, the pressure outside the compression mechanism 3 is higher than the inside of the compression chamber.
Therefore, the back surface of the first vane 10 (on the side opposite to the first roller 32a) is connected to the outside of the compression mechanism unit 3 so that the first vane 10 is pressed against the first roller 32a by the differential pressure. Has been released by.
The first spring 9 is assembled to the first cylinder block 33 a through the back pressure hole 11.
Since the crankshaft 6 rotates while the first vane 10 is pressed against the first roller 32a, the first vane 10 moves back and forth in the slit in the expansion and contraction direction of the first spring 9.

The internal structure and operation of the second cylinder block 33b are basically the same.
However, the first eccentric portion 63a and the second eccentric portion 63b have a phase difference of 180 degrees, and the first vane 10 and the second vane are disposed without a phase difference with the partition plate 35 interposed therebetween. The compression chamber 21a and the second compression chamber 21b repeat the compression operation alternately, and the refrigerant compressed in the first compression chamber is discharged from the first discharge port 31c opened in the first frame 31a to the first discharge muffler. Unlike the refrigerant discharged to 30a, the refrigerant compressed in the second compression chamber 21b differs in that it is discharged to the second discharge muffler 30b from the second discharge port opened in the second frame 31b.

Next, the structure of the partition plate 35 and the partition plate 42 which comprises the partition plate 35 is demonstrated using figures.
FIG. 3 is a plan view of the partition plate 35 composed of two divided plates 42.
The split plate 42 has a semicircular shaft cutout 45 and an oil hole cutout 48 on the mating surface 43 side, and the two split plates 42 cut out the intermediate portion 64 of the crankshaft 6 from the left and right. The partition plate 35 is formed by being assembled so as to be sandwiched between the portions 45.
At both ends of the mating surface 43 of the dividing plate 42, there are protrusions 47 for fixing the dividing plates 42 to each other, and the protrusions 47 are provided with fastening holes 44.
The two divided plates 42 are fastened to the holes 44 through fastening bolts or the like.
Although the rigidity of the dividing plate 42 is reduced by providing the oil hole notch 48 in the dividing plate 42, the position of the oil hole notch 48 is set on the mating surface 43, and a bolt is provided in the vicinity of the oil hole notch 48. By providing a fastening portion such as, it is possible to reduce deformation with respect to a load, and without increasing the plate thickness of the partition plate 35, the partition plate 35 constituted by two split plates 42 has a notch for oil holes. 48 can be provided.

As a result, the compression mechanism 3 is assembled even if the diameter of the shaft through hole 50 formed by the two notches 45 for shafts facing each other is smaller than the diameter of the first eccentric portion 63a and the second eccentric portion 63b of the crankshaft 6. It becomes possible.
Further, the oil hole notch 48 forms the oil hole 51 by combining the two divided plates 42.
The first frame body 31a, the first cylinder block 33a, the second frame body 31b, and the second cylinder block 33b also have holes penetrating in the axial direction of the crankshaft 6 at the same position, and these holes communicate vertically. Thus, the oil passages 52a and 52b are configured.

  When the compressor 100 is operated, the compressed refrigerant compressed in the second compression chamber 21b is discharged to the second discharge muffler 30b through the second discharge port in a state including refrigeration oil, and the oil passage 52b, the oil hole 51, the oil passage It flows to the first discharge muffler 30a through 52a, and is discharged into the shell 1 from the hole 53 provided in the first discharge muffler 30a.

As described above, the split plate 42 is provided with a flat surface for fixing bolts and holes 44 near both ends of the mating surface 43, and has a structure in which the two split plates 42 are fixed to each other with bolts or the like.
By combining the two divided plates 42 and fixing them with bolts or the like, the partition plate 35 and the compression mechanism unit 3 can be assembled without a large gap.
Accordingly, the two divided plates 42 do not shift due to vibrations or the like during operation of the compressor 100, and it is possible to prevent a large gap from being generated on the mating surface 43.

However, there are still gaps due to processing accuracy.
Further, due to the reduction in rigidity of the partition plate 35 due to the oil hole notch 48 provided on the mating surface 43 of the dividing plate 42, a fastening portion such as a bolt is provided in the vicinity of the oil hole notch 48 to deform the load. Even if it is reduced, there still remains a possibility that a minute gap will occur.
Therefore, the range of the first vane 10 and the second vane on the edge of the mating surface 43 is such that the mating surfaces 43 of the two split plates 42 are parallel to the moving direction of both vanes (FIG. 3, vane). The partition plate 35 is assembled in such a positional relationship as to slide in the sliding range 49).

Thereby, with respect to the mating surface on the side where both vanes are present (crank angle 0 ° direction), the refrigerating machine oil supplied to both vanes from the back pressure hole 11 is supplied along with the movement of both vanes. An oil seal is formed between the surfaces 43.
On the other hand, the refrigeration oil can be supplied through the oil passage 52 b and the oil hole 51 on the mating surface on the side where both vanes are not present (the direction of the crank angle of 180 °).
In the oil hole 51, high-pressure refrigerant and refrigerating machine oil are mixed, and the oil hole 51 is provided on the mating surface 43. Therefore, when a minute gap is generated on the mating surface 43. Refrigerating machine oil can be automatically supplied to the gap by the differential pressure.

According to the multi-cylinder rotary compressor 100 according to Embodiment 1 of the present invention, fine gaps between the divided plates 42 that partition the compression chambers can be effectively sealed with the refrigerator oil.
In addition, it is not necessary to interpose a sealing material or the like on the mating surface 43 of the partition plate 35, and sufficient sealing performance can be obtained simply by fixing them together. Therefore, the partition plate 35 can be assembled with high productivity.
FIG. 5A is a modification of FIG. 3, and FIG. 5B is a side view of FIG. 5A.
As shown in FIGS. 5A and 5B, the oil hole notch 48 is formed in the dividing plate 42 so that the shortest distance L 1 from the oil hole 51 to the compression chamber 21 is smaller than the plate thickness W 1 of the partition plate 35. By providing this, the refrigerating machine oil can be permeated into the mating surface 43 over the entire thickness of the partition plate 35.
Further, a notch is provided in the partition plate, and the distance from the oil hole 51 (oil hole notch 48) to the compression chamber 21 is made smaller than the plate thickness of the partition plate 35, so that a minute gap generated in the mating surface 43 is simply oiled. The sealing effect described below, which cannot be obtained only by using the flow passage, can be obtained.
The minute gaps on the mating surfaces can have various shapes depending on the processing and assembly of the partition plate.
For example, in the case where the center portion of the mating surface is a minute gap that is curved and dented, the gap communicates between the two compression chambers of the first compression chamber 21a and the second compression chamber 21b.
Further, for example, when the edge of the mating surface is chipped or is a minute gap that is rounded, the inside of the compression chamber and the outside of the compression mechanism unit 3 are communicated with each other.
The length of the fine gap to be sealed differs from the pressure difference applied to the fine gap, and these gaps can be formed in combination.
As in the invention described in Patent Document 1, when oil is supplied from the outside of the compression chamber simply using the gap generated on the mating surface of the partition plate as an oil flow passage, the pressure difference between the outside and the compression chamber is used to make the gap. Refrigerator oil will be supplied.
When the distance from the outside of the compression mechanism section to the compression chamber is larger than the distance (plate thickness) between the two compression chambers of the first compression chamber and the second compression chamber, the distance of the oil flow passage to the gap to be sealed The resistance for oil supply is large because the oil is long, and even if the gap between the compression chamber generated at the edge of the mating surface and the compression mechanism portion can be sealed, the two compression chambers between the first compression chamber and the second compression chamber There may be a case where sufficient oil cannot be supplied to the gap and the two compression chambers of the first compression chamber and the second compression chamber cannot be sealed.
In that respect, by providing the oil hole 51 at a position where the distance from the oil hole 51 to the compression chamber 21 is smaller than the plate thickness of the partition plate 35 as in the present invention, two of the first compression chamber 21a and the second compression chamber 21b are provided. In both cases of communication between the two compression chambers and communication between the inside of the compression chamber 21 and the outside of the compression mechanism section 3, the fine gap can be reliably sealed.

  Thereby, there is little refrigerant | coolant leakage from the compression mechanism part 3, and the highly reliable small and large capacity multi-cylinder rotary compressor 100 can be provided at low cost.

In the present embodiment, the oil passages 52a and 52b are connected to the first discharge mufflers 30a and 30b through the first frame 31a and the second frame 31b, respectively. The discharge muffler and the second discharge muffler may be omitted.
Further, even if the oil passages 52 a and 52 b are configured to open directly from the cylinder block to the outside of the compression mechanism unit 3, since the refrigerating machine oil is accumulated at the bottom of the shell 1, the refrigerating machine oil can be supplied to the oil hole 51.
FIG. 6 is a plan view showing a configuration example of another partition plate 35b according to the first embodiment.
As shown in the drawing, oil hole notches 48b may be formed in two places on the dividing plate 42b.
In this case, the vane is disposed at another position.
Refrigerating machine oil can be uniformly permeated into the entire mating surface 43b to seal a fine gap.

Embodiment 2. FIG.
Hereinafter, the second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 4 is a plan view of a partition plate 235 composed of the split plate 42 and the split plate 42b.
As shown in the figure, in the present embodiment, the oil hole notch 48 is provided only in the dividing plate 42 and is not provided in the dividing plate 42b.
Even if the oil hole notches 48 are not provided in both of the divided plates, the same effect as in the first embodiment can be obtained, and the processing cost of the divided plate 42b can be reduced.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

Claims (6)

A plurality of adjacent compression chambers;
It is divided into two divided plates, and the mating surfaces of the respective divided plates are fixed to each other by pressure contact,
In a multi-cylinder rotary compressor provided with a partition plate that partitions between adjacent compression chambers,
The mating surface of at least one of the divided plates has a notch that forms an oil hole in the axial direction of the crankshaft of the compression mechanism,
The oil hole is a multi-cylinder rotary compressor that communicates with an oil passage that penetrates a cylinder block of the compression mechanism in an axial direction of the crankshaft. The notch is provided on the side where the edge of the mating surface is in contact with the vane that partitions the compression chamber into a low pressure portion and a high pressure portion, and on the mating surface on the opposite side across the center of the mating surface. The multi-cylinder rotary compressor according to claim 1. The multi-cylinder rotary compressor according to claim 1, wherein the shortest distance between the compression chamber and the notch is smaller than a thickness of the partition plate. The multi-cylinder rotary compressor according to claim 1, wherein the notch is provided at a position where each of the mating surfaces of each of the divided plates is opposed. 2. The multi-cylinder rotary compressor according to claim 1, wherein the oil hole communicates with each discharge muffler connected to each compression chamber via the oil passage. The multi-cylinder rotary compressor according to any one of claims 1 to 5, wherein an axial direction of the crankshaft is a vertical direction, and the compression mechanism is present below a motor that drives the compression mechanism. .

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