JPH10246188A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a thrust gap for absorbing a difference of an expansion ratio between an oscillating scroll member and a block to the minimum level by extending an outer peripheral side wall of a fixed scroll member to a block side, and positioning a surface which abuts on a block on a driving shaft side above an abutting surface between a turning scroll and the block. SOLUTION: In an oscillating scroll member 40, a first key groove which is engaged with a first claw part 71 of an Oldham's ring 70 is formed on a surface on which an oscillating bearing 41 projected from a disk main body 42 is formed, and a spiral oscillating scroll 43 is formed on a side opposite thereto. An outer peripheral wall 52 is arranged on a fixed scroll member 50, which is erected from the cylindrical main body 58, and which is erected so as to enclose the fixed scroll 51 for partitioning a compression chamber while engaging with the oscillating scroll 43. The outer peripheral wall 52 is formed extending from a side of the oscillating scroll member 40 to a block side, expansion ratio of the oscillating and fixed scroll members 40, 50 are set to the same level as each other, and a gap between the oscillating scroll member 40 and a thrust bearing is suppressed to the minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air conditioner,
The present invention relates to a scroll compressor used for refrigerators and the like.

[0002]

2. Description of the Related Art A conventional scroll-type compressor disclosed in Japanese Utility Model Laid-Open No. 5-75493 (cited reference 1) is disclosed in Japanese Patent Application Laid-Open No. 5-75493 (hereinafter referred to as Reference 1). An Oldham groove, which seals a gap between the low pressure chamber 25 and a gap between the movable scroll member and the low pressure chamber 25, engages with the Oldham ring formed on the joint surface of the movable scroll member (oscillating scroll member). An oil guide groove is formed in the joint surface of the block, to which one end of the Oldham groove communicates when moved by movement.

The scroll type compressor disclosed in Japanese Patent Application Laid-Open No. H8-219043 (Cited Example 2) uses a seal ring to efficiently lubricate Oldham rings and block-side keyways. And a low-pressure side, and a lubricating oil path from the Oldham ring to the key groove is formed in series. To stabilize the oil supply to the block side.

Japanese Patent Application Laid-Open No. 6-241178 (cited reference 3) discloses that an Oldham ring is disposed between a fixed scroll and an orbiting scroll in FIG. It discloses a pair of claws slidably engaged with the Oldham guide groove of the moving scroll and a pair of claws slidably engaged with the Oldham guide groove of the fixed scroll. Discloses that the fixed scroll is radially engaged with the fixed scroll.

[0005]

However, in References 1 and 2, the block-side keyway with which the Oldham ring engages is located above the thrust surface between the orbiting scroll member and the block. Therefore, there is a problem that an oil guide groove, an oil detour, and the like must be formed. Further, in the scroll type compressor having this configuration, the block surrounding the orbiting range of the orbiting scroll member is formed of an iron-based material, and the orbiting scroll member and the fixed scroll member are formed of an aluminum-based material. Therefore, since the axial dimension of the orbiting scroll member that changes due to heat is different between the block and the orbiting scroll member, it is necessary to reduce the thrust gap between the orbiting scroll member and the block. could not.

In the case of Reference 3, since the Oldham ring is disposed between the fixed scroll member and the swinging scroll member, the Oldham ring is provided with a swinging scroll and a fixed scroll which define a compression chamber. Must be provided outside the orbiting range, and a groove for engaging with the claw portion of the Oldham ring must be provided outside the orbiting scroll portion, which causes a problem that the orbiting scroll member becomes large. Further, since the Oldham ring is disposed on the suction gas path, the Oldham ring becomes a suction resistance and may deteriorate the performance.

[0007] Therefore, an object of the present invention is to provide a scroll compressor capable of improving the lubricity of an Oldham ring and reducing the thrust gap.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a sealed case having an inlet pipe and an outlet pipe mounted thereon, a driving means disposed in the sealed case, and a drive shaft of the driving means rotatable. A oscillating scroll member having a spiral oscillating scroll that is eccentrically mounted at one axial end of the drive shaft and extends in the axial direction; and a compression chamber that meshes with the oscillating scroll. A fixed scroll member fixed to the block by swingably holding the swingable scroll member between the block and the block, and swinging with the drive shaft as the drive shaft rotates. A scroll compressor having a rotation preventing mechanism for preventing rotation of the orbiting scroll member,
The joint surface between the end portion of the outer peripheral wall in the axial direction of the fixed scroll member and the block is positioned closer to the drive shaft than the sliding surface between the orbiting scroll member and the block, and the rotation preventing mechanism includes: A ring portion arranged between the orbiting scroll member and the block and formed in an annular shape; a first claw portion protruding in the axial direction from the axial side surface of the ring portion; and a first claw portion An Oldham ring formed at a position having a predetermined angle from the position where the ring is formed, and comprising a second claw portion radially protruding from a radially outer side surface of the ring portion, and a block side of the orbiting scroll member. A first key groove formed on a side surface and slidably engaged with the first claw portion; and a radially formed outer circumferential wall of the fixed scroll member, wherein the second claw portion slides. Second keyway freely engaged Lies in consisting of (claim 1).

Therefore, in the present invention, the fixed scroll member and the orbiting scroll member are formed of an aluminum-based alloy, and the outer peripheral side wall of the fixed scroll member is extended toward the block so that the contact surface with the block is formed. Since the fixed scroll member made of the same material is surrounded around the orbiting scroll member by being located on the drive shaft side of the contact surface between the orbiting scroll member and the block. Since the axial expansion coefficients of the orbiting scroll member and the fixed scroll member can be the same, the conventional scroll scroll member and the fixed scroll member are formed to absorb a difference in expansion coefficient between the block and the block (made of an iron-based alloy). The thrust gap that has been set can be minimized.

The Oldham ring has a first claw portion slidably engaged with the first keyway of the orbiting scroll member in the axial direction of the Oldham ring, and a second claw portion of the fixed scroll member in the radial direction. Since the second claw portion slidably engaged with the key groove is formed, the lubricating oil supplied to the thrust surface between the orbiting scroll member and the block is
After lubricating the sliding contact portion between the first claw portion of the Oldham ring and the first key groove formed on the orbiting scroll member, the sliding member is formed on the fixed scroll member only by moving in the sliding direction of the Oldham ring. The lubrication of the contact sliding surface between the second key groove and the second claw portion of the Oldham ring eliminates the need to specially form an oil detour or a bypass groove.
This makes it possible to stably supply the lubricating oil between the second claw portion and the second key groove of the Oldham ring, which has conventionally been a problem.

Further, a scroll assembly (block,
Conventionally, when assembling the orbiting scroll member, the fixed scroll member and the Oldham ring), the Oldham clearance between the orbiting scroll member and the Oldham ring, the Oldham clearance between the Oldham ring and the block,
Although it was necessary to consider the shaft main clearance and the shaft swing clearance between the block and the fixed scroll member, only the swing scroll member and the Oldham ring, the Oldham ring clearance between the Oldham ring and the fixed scroll member, Since it is only necessary to consider what is called the core and the phase setting of both scrolls, the assembling work is simplified.

Further, in the present invention, the outer peripheral side wall of the block is extended to the fixed scroll side, and the fixed scroll member is fitted and fixed in the outer peripheral side wall (claim 2). With this, in addition to the above configuration, by fitting the fixed scroll member into the outer peripheral side wall of the block, all the centering of the scroll assembly can be automatically performed, so that a special centering step is not required. be able to.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

A scroll type compressor 1 shown in FIGS. 1 and 2 includes a cylindrical case 3 having an inlet pipe 2 mounted thereon,
It has a lid 6 on which a power supply terminal 4 and an outlet pipe 5 are mounted, and a closed case 8 comprising a bottom 7 for closing the bottom of the cylindrical case 3. Inside the closed case 8, a brushless motor 10 and a scroll assembly 20 as driving means are arranged.

The brushless motor 10 is fixed to an inner peripheral surface of the sealed case 8 and is fixed to a stator 11 around which an exciting coil 14 is wound and a drive shaft 12 for transmitting rotation to the scroll assembly 20. A rotating magnetic field is generated in the stator 11 by supplying electric power to an exciting coil 14 wound around the stator 11, and the rotor 13 having the permanent magnet is rotated. It is supposed to.

One end of the drive shaft 12 has a bearing 15
Holding plate 1 fixed to the closed case 8 through
6, the other end of the drive shaft 12 is rotatably held by a main bearing 32 mounted in a through hole 31 of a block 30 constituting the scroll assembly 20. An eccentric shaft 60 eccentric to the axis of the drive shaft 12 and projecting in the axial direction is formed at the other axial end of the drive shaft.
A spiral spiral groove 18 is formed along the outer peripheral surface of the contact portion with the second bearing 2 so as to supply lubricating oil to a sliding surface in contact with the main bearing 32. Further, a balance weight 17 is formed on the drive shaft 12 to balance the rotation with the orbiting scroll member 40 described below.

The eccentric shaft 60 is provided on the orbiting scroll member 4.
The oscillating scroll member 40 is slidably fitted to the oscillating bearing 41 formed at 0 and the oscillating scroll member 40 is turned with the rotation of the drive shaft 12. A seal bearing 80 is mounted around the eccentric shaft 60, and the drive shaft 12
In the axial direction, an oil space 61 described below, and a swing space 4 in which the swing scroll member 40 described below swings.
6 is pressure-blocked. A bearing space 64 is defined between the eccentric shaft 60 and the swing bearing 41.

An oil space 61 located below the main bearing 23 communicates with an oil reservoir 62 formed above the scroll assembly 20 via an oil passage 65, and the bearing space 64 communicates with the oil space. 61 and an oil guide hole 19 formed through the eccentric shaft 60.
Is in communication with A filter 63 is provided in the oil passage 65 to remove impurities from the lubricating oil supplied to each sliding contact portion.

The scroll assembly 20 is a swinging scroll which is slidably mounted on the block 30 fixed to the inner peripheral surface of the sealed case 8 and the eccentric shaft 60 and rotates by the rotation of the drive shaft 12. It comprises a member 40, a fixed scroll member 50 fixed to the block 30, and a rotation preventing mechanism for preventing the swing scroll member 40 from rotating.

The block 30 is formed of an iron-based alloy, and has a through hole 31 in which a main bearing 32 for rotatably holding the drive shaft 12 is mounted. An oil passage 65 is formed in a radial direction, which communicates a part of the block 31 and an upper portion of the block serving as the oil reservoir 62. Block 30
A thrust bearing 33 for slidably holding the orbiting scroll member 40 described below in the axial direction is formed on the lower end face of the thrust bearing 33. Further, a cover 90 having a peripheral wall 91 surrounded by a rotation range of the balance weight 17 formed on the drive shaft 12 is provided on an upper portion of the block 30. A refrigerant passage 93 is formed in the leg 92 of the cover 90.

The orbiting scroll member 40 is made of an aluminum alloy and has a disk-shaped main body 42.
And an oscillating scroll 41 of an Oldham ring 70 as a rotation preventing mechanism on a surface on which the oscillating bearing 41 is formed, as shown in FIG. The first claw with which the side claw (first claw) 71 meshes
Key groove 44 is formed, and the first key groove 44
A spiral oscillating scroll 43 is formed on the surface opposite to the surface on which is formed.

The fixed scroll member 50 is formed of an aluminum alloy similarly to the swing scroll member 40. The fixed scroll member 50 has a cylindrical main body 58, and is provided upright from the main body 58 to form the fixed scroll member 40. A fixed scroll 51 that engages with the orbiting scroll 43 to define a compression chamber 82;
Outer peripheral wall 5 erected to surround this fixed scroll 51
And 2. The outer peripheral wall 52 is formed with a through hole 53 communicating with the refrigerant passage 93 and serving as a refrigerant passage. Further, the outer peripheral wall 52 and the main body 82 have an outer end side of the fixed scroll 51 and the inlet pipe. A communication path (suction-side space) 54 that communicates with the second member is formed. A discharge hole 55 is formed in the main body 58 of the fixed scroll member 50 at an inner end side of the fixed scroll 51. A check valve 56 is disposed in the discharge hole 55,
A check valve holding plate 57 is provided at the open end of the discharge hole 55.
Is provided. A cover 83 defining a discharge space 84 is fixed to the fixed scroll member 50 so that the discharge hole 55 communicates with the through hole 53.

Further, a bypass hole 94 is formed in the middle of the compression chamber 82 so as to penetrate the main body 58 and communicate the compression chamber 82 and the discharge space 84. The open end is opened and closed by a relief valve 95 fixed by the check valve holding plate 57. A second key groove 73 is formed on the upper end surface 59 of the outer peripheral wall 52 of the fixed scroll member 50 and the contact surface between the fixed scroll member 50 and the block 40.

The Oldham ring 70 as the anti-rotation mechanism includes a ring-shaped main body 74 and a pair of claws (first claws) 7 projecting in the thickness direction of the main body 74.
1 and a pair of claw portions (second claw portions) 72 protruding in a radial direction from a position at a predetermined angle (90 ° in the present embodiment) with the first claw portion 71. 1 claw 71
Is slidably engaged with the first key groove 44 of the orbiting scroll member 40 in the axial direction.
Is slidably engaged with a second key groove 73 formed in the fixed scroll member 50 in the radial direction.

As a result, the orbiting scroll member 40 is prevented from rotating, and makes a revolving motion with respect to the fixed scroll member 50 to move the compression chamber 8 defined by the orbiting scroll 43 and the fixed scroll 51 outside. The compression work is performed by gradually reducing the size from the inside to the inside.
The high-pressure refrigerant discharged from the discharge holes 55 passes through the refrigerant passages (the through holes 53 and the refrigerant passages 93) from the discharge space 84 to reach the space (high-pressure space) 25 in which the brushless motor 10 is disposed, and It is discharged from the outlet pipe 5 to the next step.

Further, in the scroll compressor having the above-described structure, the lubricating oil retained in the oil reservoir 62 is supplied to the oil passage by the pressure difference between the high-pressure space 25 and the suction side space 54 of the compression chamber 82 and the pump action of the spiral groove 19. 6
5 to the oil space 61. The lubricating oil that has reached the oil space 61 rises while lubricating the sliding contact surface between the main bearing 32 and the drive shaft 12 by the pumping action of the spiral groove 19, and the oil from the upper end portion of the main bearing 32 It flows through a circulation path returning to the reservoir 62.

The lubricating oil that has reached the oil space 61 is
On the other hand, due to the pressure difference between the high-pressure space 25 and the suction side space 54, the oil guide hole 19 reaches the bearing space 43, lubricates between the eccentric shaft 60 and the swing bearing 41, and reaches the swing space 94. Block 30 and oscillating scroll member 40
The thrust bearing 33, which is a contact sliding portion of the Oldham ring 70, is lubricated, and the contact sliding portion of the Oldham ring 70 and the orbiting scroll member 40 and the first claw 7 of the Oldham ring 70 are lubricated.
This is for lubricating a sliding portion between the first keyway 44 and the first keyway 44. Then, lubrication is performed between the second key groove 73 formed in the fixed scroll member 40 and the second claw portion 72 of the Oldham ring 70, and the lubrication reaches the suction side space 54 and the high pressure space 25 together with the refrigerant. Then, the oil is separated and flows through a circulation path returning to the oil reservoir 62.

According to the present invention, since the second claw portion 72 of the Oldham ring 70 is formed so as to protrude in the radial direction of the Oldham ring 70, the second claw portion 72 and the second key groove 73 are formed. The lubricating oil only needs to be moved in the horizontal direction to the contact sliding portion, so that the lubricating performance can be improved as compared with the conventional structure.

The outer peripheral wall 5 of the fixed scroll member 50
2 is formed so as to extend from the side of the orbiting scroll member 40 to the block side, so that the expansion coefficient of the orbiting scroll member 40 and the fixed scroll member 50 can be the same, It is possible to minimize the gap between the orbiting scroll member 40 and the thrust bearing 33 (in the past, the dimensional change due to the difference in the expansion rate between the block 30 and the orbiting scroll member 40 was absorbed). Therefore, the sealing performance of the compression chamber 82 can be improved.

FIG. 4 shows a structure in which an outer wall 34 extending downward from the outer peripheral end of the block 30 is formed, and the fixed scroll member 50 is fitted into the outer wall 34 and fixed. Thereby, the fixed scroll member 5
Since the zero and the core and the phase of the orbiting scroll member 40 can be easily determined, the same effects as those of the above-described embodiment can be obtained. The centering of the shaft 12 and the main bearing 32 can be easily performed. In FIG. 4, components having the same function and the same function are denoted by the same reference numerals, and description thereof is omitted.

[0031]

As described above, according to the present invention, the key grooves with which the claw portions of the Oldham ring are engaged are formed in the horizontal direction (the key groove formed in the fixed scroll member) and below (in the oscillating scroll member). Keyway)
Since the lubricating oil can be stably supplied to the sliding portion of the Oldham ring, the durability of the Oldham ring can be improved.

Further, since the outer peripheral wall of the fixed scroll member extends so as to surround the oscillating scroll member, the oscillating scroll member and the fixed scroll member formed of the same member have the same thermal expansion coefficient in the axial direction. Since the gap between the block and the orbiting scroll member can be minimized, the leakage gap of the compression chamber can be reduced, and the performance of the compressor can be improved.

Further, since the fixed scroll member is engaged with the block, the centering of the scroll can be stabilized, and variations in the performance of the compressor can be suppressed. Further, since the centering of the drive shaft can be performed by the outer diameter of the block-fixed scroll member, the ease of assembling the block can be improved,
The manufacturing process can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a partially enlarged cross-sectional view of the scroll compressor.

FIG. 3 is an exploded perspective view showing a configuration of a rotation preventing mechanism.

FIG. 4 is a partially enlarged cross-sectional view of a scroll compressor in which a fixed scroll member is incorporated in a block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll type compressor 8 Sealed case 10 Brushless motor 12 Drive shaft 20 Scroll assembly 30 Block 40 Swing scroll member 44 First keyway 50 Fixed scroll member 60 Eccentric shaft 70 Oldham ring 71 First claw portion 72 Second claw Part 73 second keyway 80 seal bearing 82 compression chamber

Claims (2)

[Claims] 1. A sealed case in which an inlet pipe and an outlet pipe are mounted, driving means disposed in the sealed case, a block for rotatably supporting a driving shaft of the driving means, An oscillating scroll member having a spiral oscillating scroll that is eccentrically mounted at one end in the axial direction and extends in the axial direction, and a fixed scroll that meshes with the oscillating scroll to form a compression chamber, A fixed scroll member fixed to the block by swingably interposing the swing scroll member between the block and a block; and a rotation preventing rotation of the swing scroll member that swings with the drive shaft with rotation. A scroll type compressor having a prevention mechanism, wherein a joint surface between the axially outer peripheral wall end of the fixed scroll member and the block is formed by the orbiting scroll member and the block. Together to position the drive shaft side than the sliding surface of the rotation preventing mechanism is disposed between the orbiting scroll member and the block,
A ring portion formed in an annular shape, a first claw portion projecting in the axial direction from the axial side surface of the ring portion, and a position having a predetermined angle with the position where the first claw portion is formed. An Oldham ring formed and having a second claw portion radially protruding from a radially outer side surface of the ring portion; and a block side surface of the orbiting scroll member,
A first key groove in which the first claw portion is slidably engaged, and a radially formed outer peripheral wall of the fixed scroll member;
The scroll type compressor, wherein the second claw portion comprises a second keyway slidably engaged. 2. The scroll compressor according to claim 1, wherein an outer peripheral side wall of the block extends toward the fixed scroll side, and the fixed scroll member is fitted and fixed in the outer peripheral side wall.