JPH10331785A - Horizontal scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain disturbance of oil level caused by pulsation of refregerant discharged from a discharge hole by providing a cover for defining the discharge space communicated with the discharge hole in order to shield the discharge space from an oil sump, and providing a refregerant passage communicating the discharge space with a high pressure space. SOLUTION: A discharge space 63 is defined by a cover 62 fixed to a side surface of a fixed scroll member to be covered and it is shielded from oil in an oil sump 73 formed below a sealed case. The space 63 and a high pressure space 71 are mutually communicated by means of a refregerant passage 70 formed to penetrate the member 40 and a block 15 axially. Accordingly, when there is a disturbance in the level of oil on the side of the space 71, since oil in an oil sump side space is shielded from the space 63, the space 72 serves as the buffer space of oil on the side of the space 71 to thereby restrain disturbance of the oil level on the side of the space 71.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for compressing a refrigerant in an air conditioner, and more particularly to a horizontal scroll compressor which is disposed horizontally.

[0002]

2. Description of the Related Art A scroll compressor disclosed in FIG. 3 of Japanese Unexamined Patent Publication No. 59-29791 is a horizontal scroll compressor in which an oil reservoir is provided below a closed case. A discharge hole penetrating the oil separation element 29 around the discharge hole.
Are disclosed.

The electric compressor disclosed in Japanese Patent Application Laid-Open No. 6-346888 is a horizontal type scroll compressor in which an oil reservoir is provided below a closed case, and a discharge hole passing through the center of a fixed scroll member. And a net 21 is provided around the discharge hole.

FIGS. 2 and 4 disclose a horizontal scroll compressor in which an oil reservoir is provided below a closed case. In this scroll compressor, a discharge space communicating with the discharge hole is defined by a cover without a reference numeral, and the discharge space and the high-pressure space in which the driving device is disposed include a discharge passage, a bearing component provided on the outer periphery of a fixed end plate. Are communicated via a discharge passage provided in the circulating air passage. The oil contained in the oil reservoir is sucked by a pump attached to one end of the drive shaft and sent to the other end of the drive shaft via an oil supply path formed in the drive shaft.

[0005]

However, since the separation element of the scroll compressor disclosed in FIG. 3 of JP-A-59-29791 has a predetermined ventilation resistance, the refrigerant discharged from the discharge hole is not provided. Pulsation can be absorbed to some extent, but there is a problem that the efficiency is deteriorated.When the separation element is removed, the discharge resistance is reduced, but the pulsation of the discharged refrigerant causes the refrigerant to be stored in the oil reservoir. The liquid level of the oil is disturbed, and the liquid level of the oil becomes lower than the opening end of the oil supply pipe, causing a problem that high-pressure refrigerant is sucked into the oil supply pipe and hinders oil suction.

In the case of the electric compressor disclosed in Japanese Patent Application Laid-Open No. 6-346888, the pulsating flow of the refrigerant discharged from the discharge hole is absorbed to a certain extent by a wire mesh arranged in front of the discharge hole, and Even if the liquid level of the oil in the oil reservoir is disturbed by the pulsating flow of the refrigerant, the effect of the turbulence of the liquid level on the oil due to the pulsating flow is not significant because the pump for sucking the oil is disposed at the tip of the drive shaft. I do not receive. However, since it is necessary to provide a pump at the end of the drive shaft or to form a hole that penetrates the drive shaft, there is a problem that the cost increases due to an increase in the number of parts, an increase in the number of work steps, and the like.

Further, the scroll compressor disclosed in FIGS. 2 and 4 of Japanese Patent Application Laid-Open No. 7-189954 similarly has a discharge port side and an oil suction side separated from each other. The turbulence of the oil level due to the pulsating flow does not affect the oil suction side, but has a problem that the structure of the suction side becomes complicated. In this reference, a discharge space is defined in the vicinity of the discharge hole. However, since it is estimated that the lower part of the discharge space is in communication with the oil reservoir, the pulsating flow of the refrigerant discharged from the discharge hole is defined. It is presumed that the oil level near this is disturbed. Therefore, in this reference, it is necessary to arrange a pump and an oil suction pipe at the end of the drive shaft.

Therefore, according to the present invention, the oil suction pipe, which is the most upstream side of the lubricating oil path, is arranged in the vicinity of the component requiring lubrication, and the oil level is disturbed by the pulsating flow of the refrigerant discharged from the discharge hole. It is an object of the present invention to provide a horizontal scroll compressor capable of suppressing the occurrence of a scroll.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a substantially cylindrical hermetically sealed case having a shaft in a horizontal direction and having a refrigerant suction pipe and a refrigerant discharge pipe disposed therein, and a drive provided in the hermetically sealed case. Means, a high-pressure space in which the drive means is disposed and communicated with the refrigerant discharge pipe, an oil reservoir provided below the closed case, and a rotating shaft extending in the horizontal direction from the drive means. A block for rotatably holding the rotating shaft, an oil suction pipe having one end mounted on the block and the other end immersed in the oil reservoir, and an end of the rotating shaft eccentric to a center axis of the rotating shaft. An eccentric shaft extending from the portion, an oscillating scroll member mounted on the eccentric shaft and having a spiral oscillating scroll on the side opposite to the eccentric shaft, and the block oscillating the oscillating scroll member. while A fixed scroll member to be held; a compression chamber defined by the orbiting scroll member and the fixed scroll member, one end of which is appropriately communicated with the refrigerant suction pipe; and the compression chamber penetrating substantially at the center of the fixed scroll member. In a horizontal scroll compressor having a discharge hole communicating with the final stage, a cover defining a discharge space communicating with the discharge hole is provided to shut off the discharge space and the oil reservoir, A refrigerant passage communicating the space with the high-pressure space is provided.

Therefore, according to the present invention, a cover is provided to shut off the oil reservoir from the discharge space communicating with the discharge hole and the refrigerant passage communicating the discharge space with the high-pressure space. As a result, the refrigerant discharged from the discharge space directly reaches the high-pressure space from the discharge hole via the discharge space, so that the oil level below the discharge space is lower than that of the refrigerant discharged from the discharge hole as in the related art. Since it is not directly affected by the pulsating flow, it is possible to suppress the turbulence of the oil level in which the oil suction pipe disposed in the block is immersed. The oil reservoir-side space separated from the discharge space by the cover serves as a buffer space for fluctuations in the oil level on the high-pressure space side.

Further, the present invention is characterized in that a pressure equalizing hole is provided for communicating the high pressure space with the oil reservoir side space cut off from the discharge space. Thus, the oil reservoir side space and the high pressure space are communicated with each other by the pressure equalizing hole, so that the oil level in the oil reservoir side space can be stabilized.

Further, in the present invention, it is desirable that both the refrigerant passage and the pressure equalizing hole are formed so as to penetrate the fixed scroll member and the block. May be formed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A horizontal scroll compressor 1 shown in FIGS. 1 to 3 has a sealed case 2 having a central axis extending in a horizontal direction, and a drive unit 3 arranged in the sealed case 2. , And a compression unit 4 driven by the driving unit 3.

The closed case 2 includes a cylindrical case 6 having a refrigerant suction pipe 5 attached to a side portion thereof,
Is formed by a pair of lids 7A and 7B that close both ends of the refrigerant discharge pipe 8A.
And a power supply terminal 9 for supplying power to the drive unit 3.

The drive unit 3 is a brushless motor in this embodiment, and is fixed to the inner peripheral surface of the cylindrical case 6 and has a stator 11 wound with an exciting coil 10 to generate a rotating magnetic field. The rotor 12 has permanent magnets arranged at positions facing the stator 11 and having magnetic poles alternately different from each other, and a rotating shaft 13 to which the rotor 12 is fixed. The rotating shaft 13 is provided so as to extend in the horizontal direction, and one end on the side of the lid 7A is rotated by a sub-bearing 18 formed of a bearing disposed at a central portion of a holding plate 14 fixed to the cylindrical case 5. It is held freely.

The holding plate 14 has a coolant passage 14A, and a coolant guide 14B is formed at a portion facing the coolant passage 14A. Thereby, the refrigerant that has passed through the refrigerant through hole 14A in the axial direction is guided to the refrigerant guide 14B and is turned radially outward,
The oil is separated from the refrigerant and the oil by colliding with the inner surface of the cylindrical case 6.

The other end of the rotary shaft 13 has an enlarged diameter portion 13A formed by expanding the diameter, and an eccentric shaft 14 eccentrically protruding from the center axis of the rotary shaft 13 is formed at the end thereof. You. The enlarged diameter portion 13A formed on the other end side of the rotating shaft 13 is rotatably mounted on a main bearing 17 mounted on a through hole 16 of a block 15 fixed to the inner peripheral surface of the cylindrical case. Will be retained. Further, a balance weight 19 is provided between the rotor 12 of the rotating shaft 13 and the enlarged diameter portion 13A to balance the rotation with the orbiting scroll member 20 described below.

The compression section 4 includes the block 15, an orbiting scroll member 20 mounted on the eccentric shaft 14,
A fixed scroll member 40 that meshes with the orbiting scroll member 20 to define the compression chamber 30 is formed.

The block 15 has a through hole 16 penetrating the center thereof in the axial direction of the center axis of the rotating shaft 13 (hereinafter, axial direction), and a main bearing 17 is mounted in the through hole 16. I have. The orbiting scroll member 2 of the through hole 16
A step portion 51 for holding the seal bearing 50 is formed at the end on the zero side, and a swivel space 52 in which the swing bearing 21 described below turns is formed on the swing scroll member 20 side of the step portion 51. Is done. An orbiting scroll member 2 is provided on the end surface of the block 15 on the side of the orbiting scroll member 20.
0 is slidably held to form a thrust bearing 53,
Further, an annular Oldham ring receiving groove 54 is formed on this end face, and a block-side Oldham ring meshing groove 55 extending radially from a predetermined position of the Oldham ring receiving groove 54 is formed. is there.

The oscillating scroll member 20 has an oscillating scroll-side Oldham ring engaging groove 22 at a position perpendicular to the block-side Oldham ring engaging groove 55 on a surface that slides in contact with the thrust bearing 53. The Oldham ring 56 housed in the Oldham ring housing groove 54
Are engaged with the block-side Oldham ring engagement groove 55 and the orbiting scroll type Oldham ring engagement groove 22, thereby preventing the orbiting scroll member 20 from rotating.

An oscillating bearing 21 on which the eccentric shaft 14 is mounted is formed at the center of the side surface of the oscillating scroll member 20 on the block side so as to protrude in the axial direction.
By mounting the eccentric shaft 14 on 1, a bearing space 23 is defined in the oscillating bearing 21. On the side surface of the orbiting scroll member 20 on the side of the fixed scroll member 40, an orbiting scroll 24 projecting toward the fixed scroll member 40 and spiraling with respect to the side surface is formed.

The fixed scroll member 40 is fixed to the block 15 so as to hold the orbiting scroll member 20 rotatably between the block 15 and the fixed scroll member 40 and protrudes toward the orbiting scroll member 20. The fixed scroll 41 has a spiral shape with respect to the side surface, and the fixed scroll 41 meshes with the orbiting scroll 24 to define the compression chamber 30. Also,
The compression chamber 30 is moved by gradually decreasing the volume from the outer peripheral direction to the center along with the oscillating motion of the oscillating scroll member 20, and the suction space 31 in which the outermost end of the compression chamber 30 is opened is The compression chamber 30 communicates with the refrigerant suction pipe 5.
The innermost end is connected to a discharge hole 42 that passes through the central portion of the fixed scroll member 40 in the axial direction.

Further, a check valve 60 is disposed in the discharge hole 42, and a check valve holding plate 61 for holding the check valve 60 is mounted on the side surface of the fixed scroll member 40 on the lid 7 side. Is done. The check valve holding plate 6
1 is a leak hole 64 communicating with a discharge space 63 described below.
Is held and fixed.

With the above arrangement, the compression chamber 30 is moved from the outer peripheral portion toward the central portion by the swinging scroll member 20 which is prevented from rotating by the rotating motion of the rotating shaft 13 and swings with respect to the fixed scroll member 40. A suction space 31 for gradually reducing the volume and communicating with the refrigerant suction pipe 5;
In this case, the volume is increased, and the refrigerant is sucked, compressed, and discharged from the refrigerant suction pipe 5.

The block 15 is provided with an oil suction pipe 80 in which an opening 80A formed at one end is immersed in the oil reservoir 73.
Is communicated with an oil space 81 defined by the main bearing 17, the seal bearing 50, and the enlarged diameter portion 13A of the rotating shaft 13. The oil space 81 communicates on one hand with a spiral groove 82 formed helically on the outer peripheral surface of the enlarged diameter portion 13A, and on the other hand, the oil enlarged space 13A.
A through the eccentric shaft 14 from the side surface of the bearing space 2
3 and communicates with the oil guide hole 83. still,
A filter 84 is attached to the opening 80A of the oil suction pipe 80.

Further, an oil circulation return section 90 is mounted on the side surface of the block 15 on the drive section 3 side. The oil circulation return portion 90 is surrounded by a discharge oil space 91 to which the discharge side end of the spiral groove 82 communicates, and has an annular oil groove 92 that communicates with the discharge oil space 91. Has an oil discharge pipe 93 communicating with the oil groove 92 and immersed in the oil reservoir 73. The drive oil 3 side of the discharge oil space 92 is sealed by a sleeve 94 via an elastic member 95.

A shield plate 96 for shielding between the oil suction pipe 80 and the balance weight 19 is provided on the drive section 3 side of the oil circulation return section 90. The shield plate 96 is provided on the oil circulation return section 90. It is fixed to the block 15 together with 90.

As a result, the oil staying in the oil sump 73 is supplied from the oil sump 73 to the oil space 81 by the high pressure applied to the oil surface and the pressure difference between the suction space 31 and the spiral groove 82. Suctioned through 80. And this oil space 81
On the other hand, the oil which has reached the oil suction space 91 is sucked into the spiral groove 82 by the pump action of the spiral groove 82, lubricates the sliding portion between the enlarged diameter portion 13 </ b> A and the main bearing 17, and then reaches the oil discharge space 91. The oil is returned from the oil groove 92 of the oil circulation return portion 90 to the oil reservoir 73 via the oil discharge pipe 93.

The oil that has reached the oil space 81 is
On the other hand, the pressure difference between the oil space 81 and the suction space 31 causes the oil to be sucked into the oil guide hole 83, lubricates the sliding contact portion between the oscillating bearing 21 and the eccentric shaft 14 from the bearing space 23, and To lubricate the contact sliding portion between the thrust bearing 53 and the orbiting scroll member 20, and further mesh with the Oldham ring 56, the Oldham ring storage groove 54, the block-side Oldham ring meshing groove 55, and the orbiting scroll-side Oldham ring Lubricating the sliding part in contact with the groove 22. Then, it is sucked into the compression chamber 30 from the suction space 31, and seals the compression chamber 30 and lubricates a contact sliding portion between the orbiting scroll member 20 and the fixed scroll member 40. The oil is separated and returned to the oil reservoir 73 before being discharged from the refrigerant discharge pipe 8.

The shielding plate 96 provided between the oil suction pipe 80 and the balance weight 19 is
The oil reservoir 73 is formed so as to extend to the vicinity of the lower surface of the cylindrical case 6 to partition the oil reservoir 73 into a compression unit-side oil reservoir 73A and a drive unit-side oil reservoir 73B, and to perform a predetermined throttle action. The communication is performed by the gaps.

As a result, the oil in the drive unit side oil reservoir 73B is agitated by the rotation of the balance weight 19 and the rotation of the rotor 12 of the drive unit 3, and the oil surface is disturbed. Is provided, the turbulence of the oil in the oil reservoir 73B on the compression section side can be suppressed, so that poor suction of oil from the oil suction pipe 80 caused by the turbulence of the oil surface can be prevented.

Further, the discharge space 63 is defined by a cover 62 fixed to the side surface of the fixed scroll member 40 on the side of the lid 7B, and is formed of oil in an oil reservoir 73 formed below the closed case 2. Directly shut off. The discharge space 63 and the high-pressure space 71 are separated by the fixed scroll member 40 and the block 15.
Are communicated with each other by a refrigerant passage 70 formed so as to penetrate through in the axial direction. Reference numeral 70A is a communication groove formed in the fixed scroll member 40 for communicating between the refrigerant passage 70 and the discharge space 63.

Further, the high-pressure space 71 and a space (oil reservoir side space) 72 defined by the lid 7B and the cover 62 are communicated by a pressure equalizing hole 99 shown in FIG. The fixed scroll member 40 and the block 15
A communication hole 98 for the oil reservoir 73 is formed below the oil reservoir 73, and the oil in the oil reservoir side space 72 and the oil in the high pressure space 71 are in a conductive state.

When the pressure equalizing hole 99 is not formed, the oil in the oil reservoir side space 72 is cut off from the discharge space 63 when the oil level in the high pressure space 71 is disturbed. Therefore, the oil reservoir side space 72 serves as an oil buffer space on the high pressure space 71 side,
Disturbance of the oil level on the high pressure space 71 side can be suppressed.

In order to smoothly move the oil to the oil sump space 72, the pressure equalizing hole 99 is provided so that the high pressure space 71 and the oil sump space 72 communicate with each other. Oil level can be ensured. In this case, since the oil storage space 72 is not in direct communication with the discharge hole 42, disturbance of the oil level in the oil storage side space 72 due to the pulsating flow of the refrigerant discharge pressure can be suppressed. It is possible to absorb the turbulence of the oil level.

[0036]

As described above, according to the present invention, there is provided a cover for pressure-blocking the discharge space with which the discharge hole communicates and the oil located below the discharge space. By forming the refrigerant passage communicating with the space, the turbulence of the liquid level of the oil contained in the oil reservoir on the high-pressure space side can be suppressed, so that a stable supply of oil can be obtained, This can prevent seizure and extend the life.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a horizontal scroll compressor according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of the horizontal scroll compressor according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a horizontal-type scroll compressor according to an embodiment of the present invention, taken along a cutting plane perpendicular to the cutting plane in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontally mounted scroll compressor 2 Hermetic case 3 Drive part 4 Compressor 13 Rotation axis 14 Eccentric axis 15 Block 19 Balance weight 20 Swing scroll member 30 Compression chamber 40 Fixed scroll member 62 Cover 63 Discharge space 70 Refrigerant passage 71 High pressure space 72 Oil reservoir side space 73 Oil reservoir

Claims (3)

[Claims] 1. A substantially cylindrical sealed case having a shaft in a horizontal direction and provided with a refrigerant suction pipe and a refrigerant discharge pipe, a driving means disposed in the sealed case, and the driving means. A high-pressure space communicating with the refrigerant discharge pipe, an oil reservoir provided below the sealed case, a rotating shaft extending from the driving means in the horizontal direction, and rotatably holding the rotating shaft. A block, an oil suction pipe having one end attached to the block and the other end immersed in the oil reservoir, an eccentric shaft eccentric to the center axis of the rotating shaft and extending from an end of the rotating shaft, An oscillating scroll member mounted on an eccentric shaft and having a spiral oscillating scroll on the opposite side to the eccentric shaft, a fixed scroll member for holding the oscillating scroll member between the block and the block, A compression chamber defined by an oscillating scroll member and the fixed scroll member, one end of which is communicated with the refrigerant suction pipe as appropriate, and a discharge hole that penetrates substantially the center of the fixed scroll member and communicates with the final stage of the compression chamber. A horizontal scroll compressor comprising: a cover that defines a discharge space that communicates with the discharge hole to shut off the discharge space and the oil reservoir; and connects the discharge space and the high-pressure space. A horizontal scroll compressor characterized by having a refrigerant passage for cooling. 2. A horizontal scroll compressor according to claim 1, further comprising a pressure equalizing hole communicating the oil reservoir side space, which is cut off from the discharge space, with the high pressure space. 3. The horizontal scroll compressor according to claim 2, wherein the refrigerant passage and the pressure equalizing hole are both formed through the fixed scroll member and the block.