JP2012237288A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of lubricating sliding parts such as bearings, lip seals, and a thrust plate, while suppressing the degree of overheating of a suction gas.SOLUTION: A housing which forms one portion of a compressor case and which supports a bearing for a main shaft has formed therein: an opening through which gas to be compressed is sucked; a suction space extending in a column-shape from the opening toward the inside of the compressor; a first gas path extending from the suction space in the direction of the axis of the main shaft; and a second gas path for communicating the first gas path with the space in which the bearing for the main shaft is disposed. A shell which forms the other portion of the compressor case and which is fastened to the housing has formed therein a third gas path for connecting the first gas path and the inner space of a compression mechanism. The scroll compressor is characterized in that the first gas path and the third gas path are connected to each other in a region located further on the outer side of the main shaft in the rotation radius direction than the movable region of the bottom plate of a movable spiral body.

Description

  The present invention relates to a scroll compressor in which a gas passage for sucking compressed gas through a plurality of paths is formed in a front housing.

  Various structures have been proposed for gas passages for sucking compressed gas such as refrigerant into a scroll compressor so that the lubricating oil contained in the compressed gas can exert a lubricating action inside the compressor. .

  For example, Patent Document 1 discloses a scroll compressor in which a main suction hole and an auxiliary suction hole are formed in a front housing. Patent Document 2 discloses a scroll compressor in which a working medium flowing from an inlet and a flow path for a mist of lubricant are formed by two circuits (a first circuit and a second circuit).

  Further, Patent Document 3 discloses a scroll compressor in which a plurality of suction passages are provided so that lubricating oil in the refrigerant passes through a sliding portion such as a main bearing through the suction passages.

Japanese Patent No. 3227075 JP-A-9-32745 Japanese Patent No. 4106088

  In a scroll compressor, the suction gas is generated by pressure loss on the gas path from the suction port provided in the housing to the compression chamber that is defined by the spiral wall and determines the suction capacity, or by heat received from the sliding part. Therefore, it is necessary to design so that the superheat degree of the suction gas does not become excessive. However, none of the conventional scroll type compressors have a structure in which the suppression of the superheating degree of the suction gas is compatible with the lubrication of the bearing, the lip seal and the thrust plate.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor that can lubricate sliding portions such as bearings, lip seals, and thrust plates while suppressing the degree of superheating of the suction gas.

In order to solve the above problems, a scroll compressor according to the present invention includes an opening through which a gas to be compressed is sucked into a housing that holds a bearing of a main shaft while forming a part of a compressor housing, A suction space extending in a columnar shape from the opening to the inside of the compressor; a first gas passage extending from the suction space toward the rotation axis of the main shaft; a space in which the first gas passage and the bearing are disposed; And a second gas passage communicating with each other,
A third gas passage that connects the first gas passage and the internal space of the compression mechanism is formed in the shell that is fastened to the housing while forming the other part of the compressor housing,
The first gas passage and the third gas passage communicate with each other in a region outside the movable radial direction of the main shaft with respect to the movable region of the bottom plate of the movable spiral body.

  According to such a scroll type compressor of the present invention, by forming the suction space and the first to third gas passages, the degree of superheating of the suction gas is appropriately suppressed, and the main shaft bearing and The sliding part around the compression mechanism can be effectively lubricated. In particular, the first gas passage and the third gas passage communicate with each other in a region on the outer side in the radial direction of rotation of the main shaft with respect to the movable region of the bottom plate of the movable spiral body. Since the bottom plate does not block the communication part of both gas passages even when the body turns, it is possible to maintain a good flow state of the intake gas in the gas passages.

  In the scroll compressor according to the aspect of the invention, it is preferable that a lubricating oil passage that connects the suction space and the space in which the bearing is disposed without passing through the first gas passage is formed in the housing. By forming the lubricating oil passage, the lubricating oil contained in the compressed gas such as the refrigerant sucked from the opening of the housing can be directly fed from the suction space into the main shaft bearing without passing through the first gas passage. Can be sent to

  In such a scroll compressor, it is preferable that a porous filler is filled in the vicinity of the communicating portion between the suction space and the lubricating oil passage. As the porous filler, in addition to a porous member such as sponge or sintered metal, a porous member such as steel wool or a porous filter can be used. By filling such a porous filler in the communication portion between the suction space and the lubricating oil passage, the lubricating oil contained in the suction gas can be captured by the filler and efficiently sent to the lubricating oil passage. Therefore, the lubricity of the bearing can be further improved.

  In the scroll compressor according to the present invention, the housing and the shell are fastened by a plurality of fastening means, and the first gas passage and the third gas passage are in a region sandwiched between the adjacent fastening means. Is preferably configured to communicate with each other. When the housing and the shell are fastened by fastening means such as bolts, the compressor housing can be formed compact by configuring both gas passages so as to communicate with each other in the region between adjacent bolts. it can.

  In the scroll compressor according to the aspect of the invention, it is preferable that the suction space is configured to extend inward in the rotational radius direction of the main shaft. By forming the suction space so as to extend inwardly in the rotational radius of the main shaft, preferably in a direction perpendicular to the main shaft, the suction space can be located closer to a sliding portion where high lubricity is required, such as a bearing. Inhalation gas containing lubricating oil can be easily introduced.

  The structure of the scroll compressor according to the present invention can be suitably employed in a scroll compressor in which a fixed spiral body is formed integrally with the shell. By applying the present invention to a scroll compressor provided with a shell-integrated fixed spiral body, it is possible to appropriately suppress the degree of superheating of the suction gas without additionally providing a peripheral port.

  In the scroll compressor according to the present invention, it is preferable that a fin structure is formed inside the first gas passage. By forming the fin structure, the lubricating oil contained in the intake gas flowing through the first gas passage can be effectively captured. Lubricating oil captured by the fin structure can be sent to the bearing arrangement space via the second gas passage to improve the lubricity around the bearing, and the compression mechanism side can be improved via the third gas passage. To improve the lubricity around the compression mechanism.

  In the scroll compressor according to the present invention, it is preferable that the first gas passage is formed on a side surface of the suction space. When the first gas passage is formed on the side surface of the suction space, the compressed gas flowing in the suction space forms a flow that bends at a substantially right angle when flowing into the first gas passage. It will be. Since the lubricating oil in the compressed gas receives an inertial force at the bent portion of the gas flow, a part of the lubricating oil stays in the suction space without flowing into the first gas passage. That is, it is possible to selectively capture the lubricating oil in the compressed gas with such a simple separation mechanism.

  In such a scroll compressor, it is preferable that the suction space is formed to extend vertically downward from a portion where the first gas passage is formed. By forming the suction space in this way, the lubricating oil captured by the simple separation mechanism is stored at the bottom of the suction space. For example, when a lubricating oil passage is provided at the bottom of the suction space, The trapped lubricating oil can be efficiently supplied to various sliding parts.

  According to the scroll compressor according to the present invention, the superheat degree of the intake gas is appropriately suppressed while maintaining a good flow state of the intake gas in the gas passage, and the sliding portion around the main shaft bearing and the compression mechanism is effective. Can be lubricated.

BRIEF DESCRIPTION OF THE DRAWINGS The scroll type compressor which concerns on 1st embodiment of this invention is shown, (a) is a front view, (b) is a longitudinal cross-sectional view which shows the AA cross section of (a). 1 shows the scroll compressor of FIG. 1, (a) is a longitudinal sectional view showing a BB section of FIG. 1 (b), (b) is a transverse sectional view showing a CC section of FIG. 1 (b). is there. The scroll type compressor which concerns on the 2nd embodiment of this invention is shown, (a) is a longitudinal cross-sectional view corresponding to Fig.2 (a), (b) is a cross-sectional view corresponding to FIG.2 (b). The scroll type compressor which concerns on 3rd embodiment of this invention is shown, (a) is the longitudinal cross-sectional view corresponding to Fig.2 (a), (b) is a cross-sectional view corresponding to FIG.2 (b). The scroll type compressor which concerns on the 4th embodiment of this invention is shown, (a) is the longitudinal cross-sectional view corresponding to Fig.2 (a), (b) is a cross-sectional view corresponding to FIG.2 (b). It is a longitudinal cross-sectional view corresponding to FIG.1 (b) which shows the scroll compressor which concerns on 5th embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1A and 1B show a scroll compressor according to a first embodiment of the present invention, in which FIG. 1A is a front view and FIG. 1B is a longitudinal sectional view showing an AA section of FIG. During the operation of the compressor 1, the movable spiral body 3 is swung by the rotation of the main shaft 2, and a gas compression operation is performed by the compression mechanism 5 including the movable spiral body 3 and the fixed spiral body 4. The refrigerant gas as the compressed gas is sucked into the suction space 8 through the opening 7 provided on the side surface of the front housing 6. The suction space 8 is formed in a columnar shape extending from the opening 7 toward the inner side in the rotational radius direction of the main shaft 2 (lower side in the figure). A first gas passage 9 that extends in the direction of the rotation axis of the main shaft 2 communicates with the side surface of the suction space 8, and the accommodation space in which the counterweight 10 is accommodated from the first gas passage 9. A second gas passage 13 extending to the bearing 11 of the main shaft 2 disposed at a portion facing 12 is formed by branching.

  The front housing 6 is fastened to a shell 15 formed integrally with the fixed spiral body 4 by bolts 14 as fastening means. On the surface where the front housing 6 and the shell 15 are in contact with each other, the first gas passage 9 and the third gas are located outside the movable region of the bottom plate 3a of the movable spiral body 3 in the rotational radius direction outer side (upper side in the drawing) of the main shaft 2. The passage 16 communicates. The third gas passage 16 is formed inside the shell 15 so as to extend in the rotation axis direction (right side in the figure) of the main shaft 2, and communicates the first gas passage 9 with the internal space 5 a of the compression mechanism 5. ing. Since the first gas passage 9 and the third gas passage 16 communicate with each other outside the movable region of the bottom plate 3a in the rotational radial direction of the main shaft 2, the communication state is maintained even when the compressor 1 is in operation. .

  At the bottom of the suction space 8, the lubricating oil passage 17 that extends to the accommodation space 12 without going through the first gas passage 9 and the lubricating oil that goes to the lip seal lubricating space 20 without going through the first gas passage 9. An oil passage 18 is provided. The suction space 8 formed in this way functions as a simple oil separator that separates the lubricating oil from the sucked compressed gas. That is, the refrigerant component in the compressed gas tends to flow to the first gas passage 9 communicating with the side surface of the suction space 8, and the lubricating oil component in the compressed gas flows to the bottom of the suction space 8 due to inertia. There is a tendency to flow to the communicating lubricating oil passage 17. Therefore, it becomes possible to send lubricating oil preferentially toward the bearing 11 of the main shaft 2 that requires high lubricity.

  2 shows the compressor 1 of FIG. 1, wherein (a) is a longitudinal sectional view showing a BB section of FIG. 1 (b), and (b) is a CC section of FIG. 1 (b). It is a cross-sectional view shown. In FIG. 2, the first gas passage 9 extends toward the shell 15 side with a substantially equal cross section in the direction of the rotation axis of the main shaft 2, and in the vicinity of the shell 15, is substantially the same as the cross-sectional shape of the third gas passage 16. It is formed to have a matching cross section.

  3 shows a scroll compressor 31 according to a second embodiment of the present invention, in which (a) is a longitudinal sectional view corresponding to FIG. 2 (a), and (b) corresponds to FIG. 2 (b). FIG. The first gas passage 33 provided in the front housing 32 of the compressor 31 is enlarged in cross section with a large curvature in the direction of the rotation axis of the main shaft 2, and then has a cross-sectional shape of the third gas passage 34. It is formed so as to extend toward the shell 35 side with a substantially matching cross section.

  FIG. 4 shows a scroll compressor 41 according to a third embodiment of the present invention, where (a) is a longitudinal sectional view corresponding to FIG. 2 (a), and (b) corresponds to FIG. 2 (b). FIG. The first gas passage 43 provided in the front housing 42 of the compressor 41 has a cross-sectional shape of the third gas passage 44 after the cross-section is enlarged at a constant rate in the rotation axis direction of the main shaft 2. It is formed so as to extend toward the shell 45 side with a substantially matching cross section. Further, a fin 46 having a large surface area extends in the first gas passage 43 in the direction of the rotation axis of the main shaft 2. With such a structure, the lubricating oil in the gas flowing in the first gas passage 43 is captured by the fins 46 and guided to a portion that slides and supports the movable spiral by gravity.

  FIG. 5 shows a scroll compressor 51 according to a fourth embodiment of the present invention, where (a) is a longitudinal sectional view corresponding to FIG. 2 (a), and (b) corresponds to FIG. 2 (b). FIG. The first gas passage 53 provided in the front housing 52 of the compressor 51 has a cross-sectional shape of the third gas passage 54 after the cross-section is enlarged at a constant rate in the rotation axis direction of the main shaft 2. It is formed so as to extend toward the shell 55 side with a substantially matching cross section. Furthermore, a part of the inner wall surface of the first gas passage 53 is formed as a fin 56 extending toward the rotation axis direction of the main shaft 2. With such a structure, the lubricating oil in the gas flowing in the first gas passage 53 is captured by the fins 56, and the portion that slides and supports the movable spiral through the second gas passage (13 in the figure). And led to bearings.

  FIG. 6 is a longitudinal sectional view corresponding to FIG. 1B, showing a scroll compressor 61 according to a fifth embodiment of the present invention. The bottom portion of the suction space 63 of the front housing 62 is filled with a porous filler 64 made of porous particles or fibers. By filling the porous filler 64, the lubricating oil component in the compressed gas is efficiently captured, and the lubricating oil is easily guided to the lubricating oil passages 65 and 66. Since other structures are the same as those in FIG.

  The structure of the scroll compressor according to the present invention can be applied to any scroll compressor in which high lubricity is required for the sliding portion.

1, 31, 41, 51, 61 Compressor 2 Main shaft 3 Movable spiral body 3a Bottom plate 4 Fixed spiral body 5 Compression mechanism 5a Internal space 6, 32, 42, 52, 62 Front housing 7 Opening portion 8, 63 Suction space 9, 33, 43, 53 First gas passage 10 Counterweight 11 Bearing 12 Housing space 13, 36, 47, 57 Second gas passage 14 Bolts 15, 35, 45, 55 Shells 16, 34, 44, 54 Third Gas passage 17, 18, 65, 66 Lubricating oil passage 20 Lip seal lubrication space 21 Lip seal 46, 56 Fin 64 Porous filler

Claims (10)

A housing that forms a part of the compressor housing and holds the bearing of the main shaft, an opening through which compressed gas is sucked, a suction space that extends in a columnar shape from the opening to the inside of the compressor, and the suction A first gas passage extending from the space in the direction of the rotation axis of the main shaft, and a second gas passage communicating with the first gas passage and the space in which the bearing is disposed;
A third gas passage that connects the first gas passage and the internal space of the compression mechanism is formed in the shell that is fastened to the housing while forming the other part of the compressor housing,
The scroll compressor characterized in that the first gas passage and the third gas passage communicate with each other in a region on the outer side in the rotational radial direction of the main shaft with respect to the movable region of the bottom plate of the movable spiral body.   2. The scroll compressor according to claim 1, wherein a lubricating oil passage is formed in the housing to communicate the suction space and a space in which the bearing is disposed without passing through the first gas passage.   The scroll compressor according to claim 2, wherein a porous filler is filled in the vicinity of the communicating portion between the suction space and the lubricating oil passage.   The housing and the shell are fastened by a plurality of fastening means, and the first gas passage and the third gas passage communicate with each other in a region sandwiched between adjacent fastening means. 4. The scroll compressor according to any one of 3.   The scroll compressor according to any one of claims 1 to 4, wherein the suction space extends inward in the rotational radius direction of the main shaft.   The scroll compressor according to any one of claims 1 to 5, wherein the bearing is disposed at a portion facing an accommodation space for accommodating a counterweight.   The scroll compressor according to any one of claims 1 to 6, wherein a fixed spiral body is formed integrally with the shell.   The scroll compressor according to any one of claims 1 to 7, wherein a fin structure is formed inside the first gas passage.   The scroll compressor according to any one of claims 1 to 8, wherein the first gas passage is formed on a side surface of the suction space. The scroll compressor according to claim 9, wherein the suction space is formed so as to extend vertically downward from a portion where the first gas passage is formed.

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