JPH0245676A - Scroll compressor - Google Patents

Abstract

PURPOSE:To return lubricating oil to an oil reservoir with no contact with working fluid by partitioning its introducing path and a return path of the lubricating oil, supplied to a bearing, by the first and second partitioning members. CONSTITUTION:A bottomed cylindrical vessel 29, integrally forming the first and second partitioning members, has a cylinder part 30 and a bottom plate part 31. The cylinder part 30 forms in its one part a recessed part 32 serving as the second partitioning member, forming a return oil path 33 between the recessed part 32 and the internal peripheral surface of a shell 12, and an upper end of the return oil path 33 communicates with a return oil groove 26 and an oil reservoir 15. Lubricating oil in the oil reservoir 15 is allowed to flow successively in a return oil hole 25 and the return oil groove 26 by the action of a centrifugal pump. And the oil from the return oil groove 26 passes through the return oil path 33 with no contact at all with space for a flow of suction gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a scroll compressor, and particularly relates to cooling the motor and reducing oil run-up.

[Conventional technology]

FIG. 4 is a diagram showing the operating principle of a scroll compressor.

In the figure, 1 is a fixed scroll, 2 is an oscillating scroll, 3 is a suction chamber, 4 is a discharge boat, 5 is a compression chamber, and O is the center of the fixed scroll 1.

The fixed scroll 1 and the orbiting scroll 2 have spirals 1a and 2a having the same shape and opposite winding directions, and the shapes of these spirals 1a and 2a are formed from an involute curve 2 arc, etc., as is conventionally known. It is configured.

Next, the operation will be explained. The fixed scroll 1 is stationary with respect to space, and the oscillating scroll 2 is assembled with a phase shift of 180' with respect to the fixed scroll scroll 1, and revolves around the center 0 of the fixed scroll 1 without rotating on its own axis. FIG. 4 (al~(dl are 0° and 90' respectively in the orbital movement).

It shows the state of 180°, 270', and Fig. 4 fal
The gas confinement in the suction chamber 3 is completed in the 0° state shown in , and a vortex! ! ! A compression chamber 5 is formed between la and 2a.

With the movement of the oscillating scroll 2, the compression chamber 5 loses its volume, and the gas inside is compressed and the fixed scroll 1
It is discharged from a discharge boat 4 provided at the center of.

The outline of the device known as a scroll compressor is as above.

Next, the specific configuration and operation of the scroll compressor will be explained. Figure 5 shows an example of a conventional scroll compressor, which is disclosed in Japanese Patent Application Laid-Open No. 58-117380, especially when the scroll compressor is applied to a totally hermetic refrigerant pressure w3 machine. The concrete structure of is shown. In the figure, 1 is a fixed scroll with a spiral 1a on one side of the base plate 1b, 2 is an oscillating scroll with a spiral 2a on one side of the base plate 2b, 3 is a suction port (suction chamber), and 4 is a discharge boat. , 5 are compression chambers formed between both spirals 1a, 2a when both spirals 1a, 2a are combined with each other, and these correspond to the fixed scrolls 1 to 5 in FIG. 4. Reference numeral 6 indicates a main shaft, 7 has a suction lower a, and an oil cap is attached to cover the lower end of the main shaft 6 with a predetermined gap between the lower end surface of the main shaft 6, 8.9 a bearing frame, and 10 a main shaft. 6 is a fixed motor rotor, 11 is the motor rotor fixed to the
It is fixed to a bearing frame 9 by a stator. 12 is a sealed shell, 13 is an Oldham joint, 13a is fitted into a groove 2d provided in the swinging scroll 2, and +-315 is a shell 12.
16 is a suction pipe for fluid, and 17 is a discharge pipe for feeding the compressed fluid compressed by the compressor 5. Reference numeral 18 denotes an oscillating scroll bearing which is eccentric with respect to the main shaft 6 and is rotatably fitted into the oscillating scroll shaft 2C (provided on the other side of the base plate 2b).
It is fixed in an eccentric hole 60a formed in a. 19
is supported by the bearing frame 8, and the large diameter portion 6a at the top of the main shaft 6
20 is supported by the bearing frame 9 and is a second main bearing that supports the small diameter portion 6b at the bottom of the main shaft 6; A first thrust bearing axially supports the main shaft 6, a second thrust bearing 22 supports the stepped portion 6c between the large diameter portion 6a and the small diameter portion 6b of the main shaft 6 in the axial direction, and 23 an opening 23a at the lower end of the main shaft 6. This is an oil supply hole which is formed in the main shaft 6 and is provided eccentrically from the shaft center thereof, and communicates with each bearing 18.20. Further, 24 is a gas vent hole provided in the main shaft 6;
．． 26 is the oil return hole and oil return groove for the oil path, 27.28a
, 28b is the first . Second. This is the third communication path.

6 and 7 show the bearing frame 8.9,
Figure Cal, (bl is a plan view of the bearing frame 8, Figure 6 (a) A-A b% sectional view, Figure 7 (
al(bl, (cl is the plan view of the bearing frame 9, the seventh
FIG. 1 is a sectional view taken along line B-B and a bottom view. 6th
In the figure, 19 is the first main bearing, 25 is an oil return hole that penetrates in the axial direction and returns the oil flowing out from the first thrust bearing 21 downward, 21a is a notch, and 28b is a third communication passage. It is. Further, in the bearing frame 9 shown in FIG. 7, 9a is six mounting legs extending downward, and a cylindrical outer wall portion 9b.
Four of the axial end faces 9c have the same length in the axial direction, and one of the six mounting feet is wider in the circumferential direction than the other mounting feet. teeth,
A balancer chamber 9 has an upper concave portion that is open at the end surface 9C and closed at the upper portion, and houses a balancer 6d fixed to the large diameter portion 6a of the main shaft 6 to maintain dynamic balance as shown in FIG.
A return oil/I26 communicating with d is formed. Also, 9
e is formed at a position slightly higher than the end face 9C, and the stator 1
1, a mounting surface 16a is a fitting hole into which the suction pipe 16 is fitted, and 27 is a first communication path communicating with the second communication path 28a.

Next, the combination of the above members will be explained.

The oscillating scroll 2 is engaged with the fixed scroll 1, and the oscillating scroll shaft 2C is engaged with the main shaft 6 via the 8-speed scroll bearing 18, and is arranged between the oscillating scroll bearing I8 and the bearing frame 8. The main shaft 6 is supported by a first thrust bearing 21 provided in the bearing frame 8. The main shaft 6 is supported by a first main bearing 19. The Oldham joint 13 is supported by a bearing 20 and a second thrust bearing 22. Furthermore, the Oldham joint 13 is supported by the orbiting scroll 2 and the bearing frame 8.
It is arranged between the recessed portion 8a and is configured to prevent the oscillating scroll 2 from rotating on its own axis and to allow only the orbital movement to occur. In this state, the fixed scroll l is fastened together with the bearing frames 8 and 9 using bolts or the like. Further, the motor/rotor IO is fixed to the main shaft 6, and the motor/stator 11 is fixed to the mounting surface 9e of the bearing frame 9 by screws or the like. Further, the oil cap 7 is fixed to the main shaft 6 by press fitting, shrink fitting, or the like. The mechanism assembled in this way has the fixed and oscillating scroll 1.2 at the top, the motor rotor and stator 10.11 at the bottom, and is press-fitted into the shell 12 through the outer peripheral surfaces of the bearing frames 8 and 9. It is housed and fixed by shrink fitting etc.

Next, the operation of the scroll compressor configured as described above will be explained. When the motor/rotor 10 rotates, the main shaft 6
The wet scroll 2 begins to revolve through the Oldham joint 13, and compression begins according to the operating principle explained in FIG. 4. At this time, the refrigerant gas is sucked into the shell 12 through the suction pipe 16, and as shown by the solid arrow, the first communication hole 27 between the bearing frame 9 and the motor stator 11,
After cooling the motor by passing through an air gear knob etc. between the motor rotor 10 and the motor stator 11, it passes through the second and third communication holes 28a and 28b between the shell 12 and the bearing frame 8.9. , taken into the compression chamber 5 through the suction port 3 provided in the fixed scroll 1 and compressed. The compressed gas then passes through the discharge boat 4 and is discharged from the discharge pipe 17 to the outside of the compressor. Also, the lubricating oil is supplied from the oil reservoir 15 to an oil cap 7 disposed on the main shaft 6 as shown by the broken line arrow.
The oil is supplied to each of the bearings 18 to 20 through the suction lower a of the oil cap 7 and the oil supply hole 23 due to the centrifugal pump action of the oil supply hole 23 . And these bearings 18 to 20
The oil supplied further passes through the thrust bearing 21, flows in the order of the oil return hole 25, the balancer chamber 9d, and the oil return groove 26, and flows out into the gap between the outer peripheral surface of the motor/stator 11 and the inner peripheral surface of the shell 12. Return to oil sump 15.

[Problem to be solved by the invention]

A conventional scroll compressor is configured as described above, and the gas sucked from the suction pipe 16 is passed through the first communication path 27 or the rotor 10. The air flows through the air gap between the stators 11 in two parts. However, since the air gap is very small, most of the intake gas flows through the first communication path 27 side. Therefore, cooling of the motor section becomes insufficient, so it is possible to cool the motor section by providing a vent hole in the rotor 10 and letting a large amount of suction gas flow into the motor section. There are problems such as the oil flowing out from the grooves 26 being rolled up, increasing the amount of oil rising, and reducing the motor performance, and it is difficult to obtain a scroll compressor that has less oil rising and can sufficiently cool the motor section. Ta.

This invention was made to solve the above-mentioned problems, and the motor part can be sufficiently cooled and there is little oil run-up.
The aim is to obtain a highly reliable scroll compressor.

[Means to solve the problem]

A scroll compressor according to the present invention is provided with a first partition member and a second partition member that partition an introduction path for working fluid and a return path for lubricating oil supplied to a bearing.

[For production]

In this invention, the working fluid flows through the installation space of the motor section and is introduced into the compression mechanism, and the lubricating oil is returned to the oil reservoir without coming into contact with the working fluid.

〔Example〕

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention. In the figure, 29 is a bottomed cylindrical container in which a first partition member and a second partition member are integrally formed, as shown in its entirety in FIG.
1 exists.

Further, the upper end of the container 29 is in contact with or located near an end surface 90c of a bearing frame 90, which will be described later, and is fixed to the shell 12 by press-fitting, shrink-fitting, etc. so that the bottom plate portion 31 is located slightly above the upper surface of the oil reservoir 15. The outer circumferential surface of the cylindrical portion 30 and the inner circumferential surface of the shell 12 are brought into close contact. A recess 32 as a second partition member is formed in a part of the cylindrical portion 30, and the upper end of an oil return passage 33 formed between the recess 32 and the inner peripheral surface of the shell 12 communicates with the oil return groove 26. , the lower end communicates with the oil reservoir 15. Also, 34 is suction pipe 1
6 is inserted into the suction hole, which is provided so as to open below the stator 11 of the motor section in the container 29 or near the coil end. Further, reference numeral 35 denotes an opening formed approximately at the center of the bottom plate portion 31, and is formed to be slightly larger than the outer diameter of the oil cap 7, so that the oil cap 7 can be loosely inserted therein.

Figure 3(a), mountain 1. tel is a plan view, FIG. 3+al C-CI sectional view, and bottom view of the bearing frame 90. In these figures, 90a is a columnar mounting foot extending downward from the outer wall 90b, and its lower end surface 90C serves as a fixing surface for the stator 11. In addition, one of the four mounting legs 90a is widened in the circumferential direction, and the balancer chamber 90a is widened in the circumferential direction.
An oil return groove 26 communicating with 0d is formed.

Since the other configurations are the same as those of the conventional device, corresponding parts are given the same reference numerals and their explanations will be omitted.

Next, the operation of the scroll compressor having the above configuration will be explained. When the rotor 10 starts rotating, the refrigerant gas, which is the working fluid, flows as shown by the solid arrow in FIG. That is, part of the gas sucked into the container 29 from the suction pipe 16 flows around the coil end below the stator 11, and the rest flows into the gap formed between the inner circumferential surface of the cylindrical portion 30 and the outer circumferential surface of the stator 11. The motor part is sufficiently cooled by these flows. Here, the gap between the cylindrical part 30 and the stator 11 is the same as that between the outer circumferential surface of the cylindrical part 30 and the shell 1.
Since the inner peripheral surfaces of the stator 11 and the rotor 10 are in close contact with each other, the air gap is much wider than that between the stator 11 and the rotor 10 (thus, the motor section can be sufficiently ventilated. , mounting foot part 9 of bearing frame 90
It passes through the communication passages 28a, 28b through the passage between
2 Exhausted to the outside. Note that since the flow rate of the gas sucked into the container 29 drops rapidly, some oil brought in from outside the compressor is separated, but it is separated and adheres to the inner circumferential surface of the cylinder part 30, the outer circumferential surface of the stake 11, etc. The oil falls down these surfaces, reaches the upper surface of the bottom plate portion 31, and is returned to the oil reservoir 15 through the opening 35.

Further, the lubricating oil flows as shown by the broken line arrow in FIG.

That is, the lubricating oil in the oil reservoir 15 is pumped through the oil cap 7 - the oil supply hole 23 - each of the bearings 18 to 20 - the thrust bearing 21 -> the oil return hole 25 -> the balancer chamber 90d -> the oil return groove 26 - as in the conventional case. flows in this order. The oil from the oil return groove 26 passes through the oil return path 33 and is returned to the oil reservoir 15 without touching the space in which the suction gas flows. Therefore, oil from the oil return groove 26 and oil in the oil reservoir 15 are prevented from being carried into the compression chamber 5 by the suction gas.

In the above embodiment, the first and second partition members are integrally formed to form the bottomed cylindrical container 29, but the present invention is not limited to this, and the first partition member is connected to the motor unit installation space. As long as the second partition member partitions the oil reservoir 15 and the motor part installation space and the oil return path 33, the same effects as in the above embodiment can be achieved even if these are separate bodies.

〔Effect of the invention〕

As described above, according to the present invention, since the first and second partition members are provided to partition the working fluid introduction path for cooling the motor section and the lubricating oil return path, the motor section can be sufficiently cooled. This has the effect of providing a highly reliable scroll compressor with almost no oil leakage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a perspective view of a container of the scroll compressor,
Figure 3 fat, (bl, (cl) is a plan view, sectional view, and bottom view of the bearing frame of the same scroll compressor;
The figure shows the operating principle of a scroll compressor, FIG. 5 is a sectional view of a conventional scroll compressor, FIG. al, (bl, (cl is a plan view, a sectional view, and a bottom view of the bearing frame 9 of the same scroll compressor. 1... Fixed scroll, 2... Oscillating scroll, 6
... Main shaft, 7... Oil cap, IO... Rotor, 11... Stator, 12... Sealed shell, 15
...Oil sump, 16...Suction pipe, 17...Discharge pipe,
18-22...Bearing, 25...Oil return hole, 26...
Oil return groove, 29... Container, 30... Cylinder part, 31... Bottom plate part, 32... Recessed part, 33... Oil return path, 34...
Suction hole, 35...opening. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] a compression mechanism that combines a fixed scroll and an oscillating scroll; a main shaft that drives the oscillating scroll;
A motor unit that drives the main shaft, a bearing that supports the oscillating scroll and the main shaft, and an oil reservoir that houses these components and has an oil reservoir at the bottom in which an oil cap fixed to the end of the main shaft is immersed. a first partition member that partitions the installation space of the motor section from the oil reservoir and has an opening into which the oil cap is loosely inserted; a second partition member forming an oil return path that communicates with the oil sump and is separated from the motor space; A scroll compressor characterized by comprising a suction pipe for introducing fluid.