JP3426720B2 - Scroll compressor and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To prevent generation of any seizure of a slide part at the time of operation restart after operation stop for a long term by providing lots of minute oil sumps which can store lubrication oil on a contact slide surface with a partner member for at least one of each end place, thrust bearing, selfrotation obstruct mechanism, etc., of fixed and turning scrolls. CONSTITUTION:In a scroll type compressor formed by meshing a fixed scroll with a turning scroll 2 in each of which a scroll shape lap 21 is installed in one body to each end plate 22 by shifting their phases, lots of minute oil sumps (recessed parts) 100 are formed on the back surface of the end plate 22 of the turning scroll 2, namely on the surface sliding in contact with a thrust bearing. These oil sumps 100 are favorably formed as recessed parts with about 50mu diameter and 20-30mu depth. Thereby, as lubrication oil can be kept in the minute oil sumps 100, even after operation stop for a long term of a scroll hydraulic machine, seizure may not take place between the thrust bearing and the end plate at the time of operation restart so that favorable slide can be guaranteed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a scroll type compressor and
And a manufacturing method thereof.

[0002]

2. Description of the Related Art FIG. 9 is a vertical sectional view of a conventional hermetic scroll type compressor. In the figure, a scroll type compression mechanism C is provided in the upper portion of the closed housing 8 and an electric motor 4 is provided in the lower portion.
Are arranged, and these are interlockingly connected to each other by a rotary shaft 5. The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, an Oldham ring 3 that allows the orbital orbiting motion of the orbiting scroll 2 but prevents its rotation, a frame 6 to which the fixed scroll 1 and the electric motor 4 are locked, and a rotation. An upper bearing 71 and a lower bearing 72 that support the shaft 5 are provided, an orbiting bearing 73 and a thrust bearing 74 that support the orbiting scroll 2, and the like.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11. A discharge port 13 and a discharge valve 17 for opening and closing the discharge port 13 are provided at the center of the end plate 11. . The orbiting scroll 2 comprises an end plate 21, a spiral wrap 22 provided upright on the inner surface of the end plate 21, and a boss 23 projecting from the center of the outer surface of the end plate 11. A drive bush 54 is fitted in the boss 23. A rotary bearing 73 is rotatably supported. A slide groove 55 is bored in the drive bush 54, and an eccentric drive pin 53 protruding from the upper end surface of the rotary shaft 5 is slidably fitted in the slide groove 55. A balance weight 84 is fixed to the lower end of the drive bush 54 to balance the dynamic unbalance due to the orbiting movement of the orbiting scroll 2.

Lubricating oil 8 stored in the bottom of the housing 8
1 is sucked up from the inlet hole 51 by the centrifugal force generated by the rotation of the rotating shaft 5, passes through the oil supply hole 52, and is moved to the lower bearing 7.
2. After lubricating the upper bearing 71, the drive bush 54, etc., the oil is discharged to the bottom of the housing 8 through the balance weight chamber 61 and the oil drain hole 62. When the electric motor 4 is driven, this rotational torque is generated by the rotating shaft 5 and the eccentric drive pin 5.
3, the drive bush 54, and the orbiting bearing 73 are transmitted to the orbiting scroll 2, and the orbiting scroll 2 revolves around its axis while being prevented from rotating by the Oldham link 3. Then, the gas passes through the suction pipe 82 and the housing 8
After entering the inside and cooling the electric motor 4, the fixed scroll 1 and the orbiting scroll 2 are meshed with each other through the suction passage 15 through a suction cavity 16 formed around the spiral wraps 12 and 22 of both scrolls 1 and 2. The air is sucked into the plurality of closed spaces 24 limited by the above. The closed space 2 is formed by the orbiting motion of the orbiting scroll 2.
The discharge cavity 1 formed on the back side of the end plate 11 reaches the central portion while being compressed as the volume of 4 decreases and from there, pushes up the discharge valve 17 through the discharge port 13.
4 is discharged to the inside of the second discharge cavity 19 through the hole 18 formed in the partition wall 31, and then discharged to the outside through the discharge pipe 83.

When the orbiting scroll 2 orbits, the orbiting scroll 2 is acted on by the centrifugal force in the direction of eccentricity and the gas force of the compressed gas in the closed space 24. The side surface of the wrap 22 is pushed toward the side surface of the wrap 12 of the fixed scroll 1 by being pushed in the direction in which the turning radius increases. As the side surface of the wrap 22 and the side surface of the wrap 12 slide in close contact with each other, the orbiting radius of the orbiting scroll 2 automatically changes, and accordingly, the eccentric drive pin 53 causes the slide groove 55 to move.
To move in its longitudinal direction.

[0006]

[Problems to be Solved by the Invention] Conventionally, passenger cars, buses,
Freon 12 was exclusively used as a refrigerant in an air conditioner of a vehicle such as a truck. Even when a scroll compressor is used as a compressor for compressing the refrigerant, mist lubrication has been performed in which lubricating oil is mixed in the refrigerant in the form of mist and circulated in the refrigerant system. Freon 12 is designated as a specific CFC causing ozone layer depletion and its use is restricted.
As a refrigerant corresponding to this, the HFC134a has become effective.

When HFC134a is used as a refrigerant, polyalkylene glycol PAG synthetic oil is exclusively used as a lubricating oil, and the lubricity, durability and seizure resistance of this combination are higher than those of the conventional refrigerant CFC12 and mineral oil. Is not good. It is considered that this is because the HFC134a does not contain chlorine element (Cl), and thus it is difficult to form the surface hardened layer on the sliding / lubricating portion. For this reason, when the compressor is stopped and started after a while, there are many phenomena in which seizure occurs in the sliding portion. This is because the lubricating oil was sufficiently supplied to the sliding part of the compressor during operation, but after a lapse of time after stopping, the lubricating oil stored in the sliding part was discharged from the gap of the sliding part. It is presumed that the cause of this is that the oil is drained, the oil runs out, and the surface hardened layer does not develop as described above.

The present invention solves the above-mentioned drawbacks of the prior art, and prevents the lubricating oil from flowing out from the sliding portion even when the operation is stopped so that seizure does not occur in the contact sliding portion when the operation is restarted. To do.

[0009]

Means for Solving the Problems The present invention is to solve the above problems, and as a first means thereof, a pair of compression chambers is formed by engaging a fixed scroll and an orbiting scroll with their phases shifted. , The orbiting scroll is revolved while the thrust is supported by the thrust bearing and the rotation is prevented by the rotation preventing mechanism, thereby moving the pair of compression chambers toward the center while reducing the volume thereof to compress the gas. Contact <br/> and are in the method for manufacturing a scroll type compressor, a solid end plate of the fixed scroll, <br/> of at least one end plate of the orbiting scroll, integrally with the sliding contact surface of the mating member
A wear-resistant plate to be installed, which is hardened and hardened steel
The outer surface of the wear-resistant plate made of
Partial rapid heating, melting, rapid solidification, solidification
The surface of the top of the ridge is machined to provide a number of fine oil sumps.
The wear resistant plate is attached to the sliding surface.
A method for manufacturing a scroll compressor is provided. Well
As a second means, a fixed scroll and an orbiting scroll are used.
A pair of compression chambers that are out of phase with each other
The orbiting scroll with a thrust bearing.
And revolves while preventing rotation by the rotation prevention mechanism
By rotating the pair of compression chambers,
Compress the gas by moving it toward the center while reducing the product
The scroll compressor, the end plate of the aluminum alloy of the solid <br/> constant scrolling least <br/> also one of the end plate of the orbiting scroll, the sliding contact surface with the mating member, fast in the surface heating
・ Dissolved and solidified, and somewhat smaller than oil droplets
Manufactured from quench hardened steel with many fine holes
Scroll, characterized in that integrally provided with a wear resistant plate was
Provide a compressor .

[0010]

According to the above first means and second means,
Many fine oil pools, that is, fine holes, on the surface of the member
It is provided with the abrasion-resistant board with lubricating oil held by suction thisゝ, therefore at the time when the compressor is operating stop long time also, the lubricating oil does not flow out from the gap, when restarting operation There is no seizure on the sliding surface.

Further, since the integrally provided with a wear-resistant plate having a large number of fine oil reservoir, an effect of preventing wear.

[0012]

1 is a perspective view of an orbiting scroll 2 of a first study example studied according to the present invention. The orbiting scroll 2 is made of aluminum alloy. 21 in the figure
Is a spiral wrap, 22 is an end plate, 25 is a guide groove into which the Oldham ring is fitted and slid, 100 is a back surface of the end plate, that is, a large number of fine oil reservoirs provided on a surface that slides in contact with the thrust bearing 74. (Recess). Fine oil sump 100 is a straight diameter of 5
It is a recess having a depth of 0 μ and a depth of 20 to 30 μ.

The processing of the fine oil sump is obtained by the following procedure.
That is, when a surface to be processed is irradiated with an ion beam, a laser beam, or an electron beam to locally and rapidly heat and melt the surface of the processed material, rapid solidification causes solidification. The interspersion of local ridges will be similar in form to recesses in the plane. In the illustrated oil sump, the top of this ridge is surface-processed to obtain a surface morphology similar to that of forming a hole in a flat surface. The oil sump processed on the surface of the member is a fine hole that is somewhat smaller than the oil droplet determined by the surface tension. Droplets of oil are adsorbed and held on the wall surfaces of the fine holes while overhanging from the holes.

The fine oil sump 100 retains lubricating oil in the fine oil sump even when the scroll fluid machine is stopped for a long time, so that seizure with the thrust bearing 74 occurs when the operation is restarted. Is eliminated, and good sliding is performed.

FIG. 2 is a second study example studied according to the present invention.
2A is a cross-sectional view of a main part of the aluminum alloy orbiting scroll 2 of FIG. 1, FIG. 1A is a cross-sectional view taken along the line AA of FIG. 1, and FIG. In the figure, 25 is a guide groove into which the Oldham ring 3 is fitted and slid.

In the second study example, a large number of fine oil sumps 10 similar to those in the first study example are formed on the bottom surface and the side surface of the guide groove 25.
In the example in which 0 is provided, seizure between the guide groove 25 and the Oldham ring 3 is prevented when the operation is restarted after the operation is stopped for a long time.

FIG. 3 is a third study example studied according to the present invention.
3 is a perspective view of the aluminum alloy orbiting scroll 2 of FIG. The present study example is an example in which a large number of fine oil sumps 100 similar to those of the first study example are provided on the belly surface of the end plate 22, that is, the surface that contacts and slides with the peripheral portion of the fixed scroll 1. This prevents seizure between the orbiting scroll end plate and the peripheral portion of the fixed scroll when the operation is restarted after the operation is stopped for a long period of time.

FIG. 4 is a perspective view of the aluminum alloy orbiting scroll 2 according to the first embodiment of the present invention. In the figure, reference numeral 26 is a wear resistant plate integrally provided on the back surface of the end plate 22, and is attached by adhesion or the like. The wear resistant plate 26 is made of quench hardened SK material or the like, and a large number of fine oil sumps 100 are provided on the outer surface thereof by the same method as in the first study example.

The present embodiment is an improvement of the first study example, in which the thrust bearing 7 at the time of restarting operation after a long stop
The seizure with the No. 4 is prevented, and the wear is further prevented.

FIG. 5 is a perspective view of an aluminum alloy orbiting scroll 2 according to a second embodiment of the present invention. In the figure, reference numeral 26 is a wear-resistant plate attached by adhesion or the like to the belly surface of the end plate 22, that is, the surface that contacts and slides with the peripheral portion of the fixed scroll 1. On the outer surface of this wear resistant plate, the first inspection
討 Example Like a number of sump 100 is provided.

Also in this embodiment, seizure between the orbiting scroll end plate and the peripheral portion of the fixed scroll and abrasion of the orbiting scroll end plate are prevented when the operation is restarted after a long stop.

FIG. 6 is a fourth study example examined according to the present invention.
3 is a perspective view of a thrust bearing 74 of FIG. The present study example is an example in which a large number of oil sumps 100 are provided on the surface of the thrust bearing 74 that contacts and slides with the rear surface of the orbiting scroll end plate. Also in this study example, seizure at the time of restarting the operation after a long stoppage is prevented. If a large number of oil sumps 100 are provided on the surface of the thrust bearing 74 on the opposite side to the above, seizure with the peripheral projection of the Oldham ring 3 of the sliding counterpart is prevented.

FIG. 7 shows a fifth examination example examined according to the present invention.
FIG. 3 is an end view of the aluminum alloy fixed scroll 1 of FIG. The present study example is an example in which a large number of oil sumps 100 are provided on the peripheral portion of the end plate 12 of the fixed scroll on the ventral side, that is, on the surface that is in sliding contact with the end plate of the orbiting scroll. Also in this study example, seizure at the time of restarting the operation after a long stoppage is prevented.

FIG. 8 shows a sixth examination example examined according to the present invention.
It is a perspective view of the Oldham ring 3. In this study example, the surface of the outer peripheral protruding portion of the Oldham ring, that is, the guide groove 25 of the orbiting scroll, the guide groove (not shown) provided in the frame 6, or the portion that slides in contact with the thrust bearing 74. This is an example in which an oil sump 100 is provided. Book
Also in the study example, seizure on these sliding surfaces is prevented.

[0025]

Industrial Applicability The method of manufacturing the scroll compressor of the present invention.
In the case of fixed scroll end plates and orbiting scroll
At least one of the end plates has one
It is a wear-resistant plate that is physically provided and is hardened by quenching.
The outer surface of a wear-resistant plate made of steel is irradiated with a beam and exposed.
The surface is locally rapidly heated, melted and then rapidly solidified.
The surface of the top of the ridge due to solidification is processed to form a fine oil sump.
Provide a large number and attach the same wear resistant plate to the sliding surface.
In, In the scroll compressor of the present invention, A
At least one of the end plate of the fixed scroll and the end plate of the orbiting scroll made of the aluminum alloy , the contact sliding surface with the mating member, the surface is rapidly heated, melted and solidified, and oil droplets
Quenching hardness with many small holes that are somewhat smaller
Since the abrasion-resistant plate made of the changed steel material is integrally provided, seizure of the sliding portion can be prevented when the operation is restarted after a long stop. In addition, many fine oil sumps
A wear-resistant plate with
Be stopped.

[Brief description of drawings]

FIG. 1 is a perspective view of an orbiting scroll 2 of a first study example studied according to the present invention.

FIG. 2 is a cross-sectional view of an essential part of an aluminum alloy orbiting scroll 2 of a second study example studied according to the present invention,
1A is a cross-sectional view taken along the line AA of FIG. 1, and FIG.
Enlarged view of part.

FIG. 3 is a perspective view of an aluminum alloy orbiting scroll 2 of a third study example studied according to the present invention.

FIG. 4 is a perspective view of an aluminum alloy orbiting scroll 2 according to the first embodiment of the present invention.

FIG. 5 is a perspective view of an aluminum alloy orbiting scroll 2 according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a thrust bearing 74 of a fourth study example studied according to the present invention.

FIG. 7 is an end view of a fixed scroll 1 made of an aluminum alloy according to a fifth study example studied according to the present invention , on the side in contact with the orbiting scroll.

FIG. 8 is a perspective view of an Oldham ring 3 of a sixth study example studied according to the present invention.

FIG. 9 is a vertical cross-sectional view of a conventional hermetic scroll compressor.

[Explanation of symbols]

1 fixed scroll 11 spiral wrap 12 End plate 2 orbiting scroll 21 spiral wrap 22 End plate 25 guide groove 26 Abrasion resistant plate 3 Oldham ring 74 Thrust bearing 100 oil sump 110 upheaval

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-159242 (JP, A) JP-A-61-8402 (JP, A) JP-A-3-111522 (JP, A) JP-A-6- 81779 (JP, A) JP-A-5-26186 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. A fixed orbiting scroll and an orbiting scroll are out of phase with each other to form a pair of compression chambers. by the manufacturing method of the scroll type compressor for compressing the pair of compression chambers are moved toward the center while reducing in volume a gas, the end plate of the fixed scroll, at least one end plate of the orbiting scroll , A wear-resistant plate that is integrally provided on the sliding contact surface with the mating member
The outer surface of a wear-resistant plate made of quench hardened steel.
The surface is rapidly heated by locally irradiating the
After that, solidify rapidly, and the top of the ridge due to solidification is surface processed
And a large number of minute oil sumps are provided , and the same wear-resistant plate is slid
The scroll type compressor, characterized in that attached to the surface
Manufacturing method . 2. A fixed orbiting scroll and an orbiting scroll are out of phase with each other to form a pair of compression chambers, and a revolving orbiting motion is performed while the orbiting scroll is supported by a thrust bearing and the rotation is prevented by a rotation preventing mechanism. By doing so, in the scroll type compressor that compresses gas by moving the pair of compression chambers toward the center while reducing the volume thereof , at least one of an end plate of an aluminum alloy fixed scroll and an end plate of an orbiting scroll. Quickly heats and melts the surface of the sliding contact surface with the mating member
・ Coagulated and finer than oil droplets
A scroll-type compressor having a large number of holes and integrally provided with a wear-resistant plate made of quench-hardened steel .