JPS62142883A - Scroll compressor - Google Patents

Abstract

PURPOSE:To reduce the rotation resistance of a balancer while reducing a motor load and improve compression efficiency by forming a discharge passage for discharging oil which is fed to lubricate a bearing part into an oil sump, in a balancer chamber. CONSTITUTION:A lubricating oil which has reached an oil return port 25 after passing through bearings, flows out into an oil discharge passage 30 formed on the bottom face on a balancer chamber 40 side of a bearing frame 8, and is further moved in the oil discharge passage 30 in the direction of an opening 32a, from which it is introduced into the nearby oil return port 26 of a bearing frame 9. By this structure, since the oil which flows out of the oil return port 26 will not directly flow down on a balancer 6d, the lubricating oil can be prevented form being stirred due to the rotation of the balancer 6d, preventing increase in motor load.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a scroll compressor, and particularly to a scroll compressor that prevents oil after bearing lubrication from flowing down onto a balancer.

[Conventional technology]

The principle of a scroll compressor will be briefly described.

Figure 3 shows the basic components and compression 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 the compression chamber. Further, 0 is the center of the fixed scroll 1.

The fixed scroll 1 and the oscillating scroll 2 have spirals 1a and 2a having the same shape and opposite winding forces i, and the shapes of these spirals 1a and 2a are, as conventionally known, involute curves, circular arcs, etc. It consists of

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 degrees with respect to the fixed scroll 1, and rotates around the center ○ of the fixed scroll 1 without rotating on its own axis. As shown in Fig. 2a-d, <O', 90
", 180'.

Exercise like 2700. In the figure, gas confinement in the suction chamber 3 is completed in state 06 shown in FIG. 2(a), and a compression chamber 5 is formed between the spirals 1a and 2d.

As the orbiting scroll 2 moves, the compression chamber 5 gradually reduces its volume, and the gas therein is compressed and discharged from the discharge port 4 provided at the center of the fixed scroll 1.

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

Next, the specific configuration and operation of the scroll compressor will be explained. Figure 3 shows, for example, Japanese Patent Application No. 59-4250.
This figure shows the configuration of an embodiment of a scroll compressor as shown in No. 3, and in particular, the scroll compressor is applied to a hermetic refrigerant compressor. In the figure, 1 is a fixed scroll having a spiral 1a on one side of a plywood 1b;
2 is an oscillating scroll equipped with a spiral 2a on one side of a base plate 2b, 3 is an inlet (suction chamber), 4 is a discharge port, and 5 is both spirals 1a, 2a when both spirals 1a, 2a are combined with each other.
A compression chamber formed between, 6 is a main shaft, (6d) is a balancer for statically balancing the oscillating scroll (2), 7
8. has a suction lower a, and is mounted to cover the lower end of the main shaft with a predetermined gap between the oil cap and the lower end of the main shaft;
9 is a bearing frame, 10 is a motor rotor, 11 is a motor stator, 12 is a shell, 13 is an Oldham joint, 1
4 is a baffle plate, 15 is an oil reservoir provided at the bottom of the shell 12, 16
17 is a suction pipe, 17 is a discharge pipe, 18 is an oscillating scroll bearing eccentric to the main shaft 6 and rotatably fitted into an oscillating scroll shaft 2c provided on the other surface of the base plate 2b,
It is fixed in an eccentric hole 60a formed in a large diameter portion 6a at the upper end of the main shaft 6.

19 is a first main bearing that supports the outer peripheral surface 61a of the large diameter section 6a at the top of the main shaft 6; 20 is a second main bearing that supports the small diameter section 6b at the bottom of the main shaft 6; 21 is a base plate of the swinging scroll 2; 2b
A first thrust bearing axially supports the lower surface 20b of the main shaft 6; 22 is a second thrust bearing axially supports the stepped portion 6C between the large diameter portion 6a and the small diameter portion 6b of the main shaft 6; 23;
has an opening 23a at the lower end of the main shaft 6, and is an oil supply hole provided in the main shaft 6 eccentrically from its axis.
It is connected to. 24 is a first gas vent hole provided in the main shaft 6, 25.26 is an oil return hole for an oil path, and 27.28 is a communication hole for an intake gas path. 40 is the bearing frame 8
．． This is a balancer chamber that accommodates a balancer 6d formed by 9.

Here, in the swinging scroll 2, the swinging scroll shaft 2c is engaged with the main shaft 6 via the swinging scroll bearing 18 while being engaged with the fixed scroll 1, and the swinging scroll shaft 2c is engaged with the main shaft 6 via the swinging scroll bearing 18, and the swinging scroll shaft 2c is engaged with the main shaft 6 through the swinging scroll bearing 18. It is supported by a first thrust bearing 21 provided therein. Furthermore, the main shaft 6
is a bearing frame 8.9 that is connected to each other with a spigot etc.
A first main bearing 19, a second main bearing 20,
It is supported by a second thrust bearing 21.

Further, the Oldham joint 13 is disposed between the swinging scroll 2 and the bearing frame 8, and is configured to prevent the swinging scroll 2 from rotating on its axis and to allow only revolution movement. In this state, the fixed scroll 1 is collinear with the bearing frames 8 and 9 by bolts or the like. Also,
A motor rotor 10 is attached to the main shaft 6, and a motor stator 11 is attached to the main shaft 6.
are fixed to the bearing frame 9 by press fitting, shrink fitting, screwing, etc., respectively. Furthermore, the oil cap 7 is fixed to the main shaft 6 by press fitting, shrink fitting, or the like. The mechanical part assembled in this way is housed and fixed in the shell 12 by press-fitting, shrink-fitting, etc., with the fixed and oscillating scrolls 1 and 2 at the top and the motor/rotor 10 and stator/rotor 11 at the bottom. .

Next, the operation of the scroll compressor configured as described above will be explained. When the motor rotor 10 rotates, the oscillating scroll 2 begins to revolve through the main shaft 6 and the Oldham joint 13, and compression begins according to the operating principle explained in FIG. 1. At this time, the refrigerant gas is supplied to the shell 1 from the suction pipe 16.
2 and passes through the communication hole 27 between the bearing frame 9 and the motor/stator 11, the air cap between the motor/rotor 10 and the motor/stator 11, etc. to cool the motor, as shown by the actual arrow. After that, it passes through the communication hole 28 between the shell 12 and the bearing frames 8, 9, is taken into the compression chamber 5 through the suction port 3 provided in the fixed scroll 1, and is compressed. The compressed gas passes through the discharge port 4 and is discharged from the discharge pipe 17 to the outside of the compressor. In addition, lubricating oil is supplied from the oil reservoir 15 through the suction lower a of the oil cap 7 and the oil supply hole 23 by the centrifugal pump action of the oil cap 7 and the oil supply hole 23 disposed on the main shaft 6 as shown by the broken line arrow. Bearings 18, 20 are lubricated, and from bearing 18, bearings 21, 19, and 22 are lubricated in this order. The oil used for lubrication mainly flows through the oil return hole 2 provided in the bearing frame 8.
5. The oil is returned to the oil reservoir 15 through the oil return hole 26 provided in the balancer chamber 40° bearing frame 9. Moreover, the bearing 2
A baffle plate 14 is provided to close the gap between the bearing frame 8 and the outer circumferential surface of the swinging scroll 2 so that oil leaking from the first etc. is not directly sucked into the suction port (suction chamber) 3. The plate 14 and the swinging scroll 2 separate the suction port (suction chamber) 3 from the swinging mechanical section. In addition, the gas vent hole 24 provided in the main shaft 6 is connected to the oil cap 7 during operation.
This is to quickly discharge the gas inside to the outside of the shaft and increase pump efficiency.

[Problem that the invention seeks to solve]

In the conventional scroll compressor as described above, the oil used for lubricating the bearings flows into the balancer chamber 40 from the oil return hole 25 provided in the bearing frame 8, and flows onto the balancer 6d formed in the main shaft 6. Flow down.

This means that the rotating balancer 6d has to shake off the highly viscous oil before rotating, which increases the actual rotational resistance, resulting in loss and an increase in the motor load, as well as an increase in the compressor load. This caused performance to deteriorate.

This invention was made to solve the conventional problems as described above, and provides a scroll compressor that eliminates the flow of oil used for lubrication directly onto the balancer and eliminates the increase in load on the electric motor. The purpose is to

[Means for solving problems]

A scroll compressor according to the present invention has an oil drainage path formed in a balancer chamber to guide lubricating oil flowing out from an oil return hole provided in a first bearing frame to an oil return hole provided in a second bearing frame. It is.

[Effect]

In this invention, the oil drain path flows out from one oil return hole. The oil used to lubricate the bearing is guided to the other oil return hole (so the oil used for oil spills does not flow directly into the balancer).

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 and 2, the same reference numerals as in FIG. 4 represent the same parts. This embodiment differs from FIG. 4 in that the oil return hole 25 provided in the first bearing frame 8
The lubricating oil flowing out from the balancer 6 in the balancer chamber 40
A drainage path 30 is formed on the lower surface of the first bearing frame 8 on the balancer chamber 40 side to lead the oil to the return hole 26 provided in the second bearing frame 9 without causing the oil to flow down.

The oil drain path 30 is located in the first balancer chamber 40.
A circular recess 31 is formed on the lower surface of the second bearing frame 8 to communicate with the oil return hole 25, and an edge that covers the circular recess 31 and faces the oil return hole 26 provided in the second bearing frame 9 is connected to the oil return hole 25. A cover plate 32 is formed by cutting out an opening 32a to form an opening 32a, and by tightening the inner and outer peripheral edges of the cover plate 32 to the ribs 8'a and 8b with screws 33, the cover plate 32 can be attached to the first It is fixed to the bearing frame 9 of.

In the scroll compressor configured in this manner, the lubricating oil that passes through each bearing and reaches the oil return hole 25 is routed through the oil drain path 3.
The oil then flows into the oil drain path 30 to the opening 32a, and is introduced from the opening 32a into the oil return hole 26 of the second bearing frame 9 adjacent thereto. As a result, oil return hole 2
The oil flowing out from the balancer 6d does not flow directly onto the balancer 6d, which prevents agitation of the lubricating oil due to the rotation of the balancer 6d, suppresses an increase in motor load, and improves the performance of the compressor. can.

〔Effect of the invention〕

As described above, according to the present invention, the first
The oil flowing out from the oil return hole provided in the bearing frame of
An oil drainage path leading to the oil return hole in the bearing frame prevents the oil used for lubrication from flowing directly into the balancer, preventing the balancer from agitating the oil and reducing the load on the motor. This has the effect of suppressing the amount of damage and providing a compact, high-performance scroll compressor.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of a scroll compressor according to an embodiment of the present invention, Fig. 2 is a bottom view of the oil drainage path portion in Fig. 1, and Figs. 3 (a) to (d) are scroll compressor Fig. 4 is a sectional view of a conventional scroll compressor. DESCRIPTION OF SYMBOLS 1... Fixed scroll, 1a... Spiral, 2... Oscillating scroll, 2a... Spiral, 5... Compression chamber, 6...
... Main shaft, 6d... Balancer, 8... First bearing frame, 9... Second bearing frame, 12... Shell, 15... Oil sump, 18... Oscillating scroll bearing,
19...First main bearing, 20...Second main bearing, 2
DESCRIPTION OF SYMBOLS 1... 1st thrust bearing, 22... 2nd thrust bearing, 25... 1st oil return hole, 26... 2nd oil return hole, 30... oil drain route, 31...Circular recess, 32
...cover plate, 33...screw. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (2 others) Chi 1 Figure 2'tMD;z)cy-tt, -3o:f! l;tbf
! 4t*b・Main axis 32: Shoe #zq-Jbzuj7't, -43 Supporting part...B, 2b 2, = Q, -mνX Spear 2 figure 0° qo'plane'! ! Figure 4 Dear Commissioner of the Japan Patent Office 1. Indication of the case 2. Name of the invention Scroll compressor 3. Person making the amendment Relationship to the case Patent applicant Date of amendment order February 25, 1985 (Date of shipment)
Procedural amendment (voluntary) ■. Indication of the incident: Patent Application No. 1984-284617 2,
Title of the invention Scroll compressor 3, person making the amendment 5, subject of amendment (1) Claims column in the specification (2) Detailed explanation of the invention column in the specification (3) Drawings 6, Amendment Contents (1) Amend the claims of the specification as shown in the attached sheet. (2) On page 4, line 6 of the specification letter, the phrase "static balance" is corrected to "balance." (3) On page 8, line 16, it says “substantial resistance” 7.
Attached documents (1) Document containing the entire text of the amended claims (1 copy) (2) Amended drawings (1 copy) The amended claims 2 and 3 are combined eccentrically to each other. A fixed scroll and an oscillating scroll that form a compression chamber, the above-mentioned oscillating scroll are lK! ! a main shaft that rotates, a balancer provided on the main shaft, a first bearing frame that supports the oscillating scroll in the axial direction and supports an upper part of the main shaft via a first bearing, and the first bearing frame. a second bearing frame that supports the balancer and forms a balancer chamber for accommodating the balancer; an oil reservoir that supplies lubricating oil to each of the bearings through an oil supply hole formed in the main shaft; and the first bearing frame.
a first oil return hole formed in the bearing frame to guide the oil used for lubrication of each of the bearing parts to the balancer chamber; a first oil return hole formed in the second bearing frame to discharge oil from the balancer chamber to the oil sump; A scroll compressor having a second oil return hole, characterized in that an oil drain path is provided in the balun chamber for guiding lubricating oil flowing out from the first oil return hole to the second oil return hole. Scroll compressor. 2: Song〉λriρire 30:# station δtjb・main axis
32:Hadahori do 9・Iφzut, 7 ray 4 33・bko・・257
2 Otsu: Emeiλb)ko

Claims (1)

[Claims] A fixed scroll and an oscillating scroll that form a compression chamber by eccentrically combining three spirals, a main shaft that drives the oscillating scroll, a balancer provided on the main shaft, and a balancer that drives the oscillating scroll in the axial direction. a first bearing frame that supports the main shaft and supports the upper part of the main shaft via a first bearing; a second bearing frame that supports the first bearing frame and forms a balancer chamber that accommodates the balancer; an oil reservoir that supplies lubricating oil to each of the bearings through an oil supply hole formed in the main shaft; A scroll compressor having a second oil return hole formed in the second bearing frame and discharging oil in the balancer chamber to an oil reservoir, wherein the scroll compressor has a second oil return hole formed in the second bearing frame to discharge oil in the balancer chamber from the first oil return hole into the balance chamber. A scroll compressor characterized in that an oil drain path is provided to guide outflowing lubricating oil to the second oil return hole.