JPS61268880A - Coolant compressor - Google Patents

Abstract

PURPOSE:To prevent the mixing of foreign material into lubricating oil by installing a strainer onto a partitioning plate which covers the upper part of an oil reservoir into which th lower edge part of a main shaft is immersed, so as to cover the lower edge of the main shaft, in the coolant compressor such as scroll compressor in which the main shaft is arranged in the vertical direction. CONSTITUTION:In a coolant compressor, a swing scroll installed in eccentric form at the upper edge of a main shaft 6 is swung by the revolution of a motor rotor 10, and coolant gas attracted into a compression chamber formed between a fixed scroll is compressed, and then discharged. During this time, the lubricating oil in an oil reservoir 15 is pumped up by the centrifugal pump action through an oil cap 7 and an oil feeding hole 23 arranged on the main shaft 6 and supplied into each bearing, and after lubrication, the oil is accumulated onto a partitioning plate 30, and returned into the oil reservoir 15 through a check valve 31. With such constitution, a strainer 32 consisting of a net structure is installed so as to cover a penetration hole 3a into which the main shaft 6 of the partitioning plate 30 penetrates, and the inflow of the foreign material mixed into the lubricating oil into a suction hole 7a and the oil feeding hole 23 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improving the lubrication reliability of refrigerant compressors such as scroll compressors.

[Conventional technology]

Although this invention is applied to a refrigerant compressor, the case where it is applied to a scroll compressor will be described here.

Before entering into the description of this invention, the principle of the scroll fluid machine will be briefly described.

Figure 4 shows the basic components and compression principle when a scroll fluid machine is used as a compressor. In the figure, 1 is a fixed scroll, 2 is an oscillating scroll, 3 is a suction chamber) 4 The discharge boat 5 is a compression chamber. Also・O
is the center of the fixed scroll 1.

The fixed scroll 1 and the orbiting scroll 2 have spirals 1ae2m having the same shape and opposite winding directions, and the shapes of these spirals 1a and 2a are 1 as known in the art.
It is composed of involute curves, circular arcs, etc.

Next, the operation will be explained. The fixed scroll 1 is stationary in 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 0 of the fixed scroll 1. 0° as shown in Figure 1 a" d.
, 90° 1180°.

Move like 270°. In the figure, 0° as shown in Figure 1a
The confinement of the gas in the suction chamber 3 is completed in the state of , and the vortex 1a
- Compression chamber 6 is formed between 23.

As the oscillating scroll 2 moves, the compression chamber 5 gradually reduces its volume, and the gas therein is compressed and discharged through the discharge boat 4 provided at the center of the fixed scroll 1. Scroll compression The outline of the device known by its name is as above.

Next, the specific configuration and operation of the scroll compressor will be explained. Fig. 5 shows the configuration of an embodiment of the scroll compressor shown in Japanese Patent Application No. 59-023280, and in particular, shows a specific embodiment in which the scroll compressor is applied to a totally hermetic refrigerant compressor. be. In the figure, 1 has a fixed scroll, 2 an oscillating scroll, 3 a suction port (suction chamber), 4 a discharge boat, 5 a compression chamber, 6 a main shaft, 7 a suction lower a, and the lower end of the main shaft 6. and oil cylinders 7', 8, which are installed so as to cover the lower end of the main shaft 6 with a predetermined gap.
9 is a bearing frame, 10 is a motor rotor, 11 is a motor stator, 12 is a shell, 13 is an Oldham joint, 14
15 is a baffle plate, and 15 is an oil reservoir 116 provided at the bottom of the shell 12.
17 is a suction pipe, 17 is a discharge pipe, 18 is an oscillating bearing rotatably fitted to the oscillating scroll shaft 2b provided eccentrically on the main shaft 6, and 19 is a oscillating bearing that supports the large diameter portion 6a at the upper part of the main shaft 6. 1
, 20 is a second main bearing that supports the small diameter portion 6b at the bottom of the main shaft 6, 21 is a first thrust bearing that supports the lower surface of the orbiting scroll 2 from the axial direction, and 22 is the large diameter portion of the main shaft 6. A second thrust bearing 23 axially supports the stepped portion 6c between the small diameter portion 6a and the small diameter portion 6b, and has an opening 23m at the lower end of the main shaft 6, and an oil supply hole provided in the main shaft 6 eccentrically from its axis. and communicates with each bearing 18, 20. 24 is a gas vent hole provided in the main shaft 6, 25.26 is an oil return hole for the oil path, 27.28 is a communication hole for the suction gas path, and 30 is a partition plate that covers the upper part of the oil reservoir.030 The partition plate has a 30 m through hole through which the lower end of the main shaft 6 passes, and the outer edge part 30b, which is formed in a cylindrical shape and protrudes toward the upper surface side, is welded to the inner circumferential surface of the shell 12 by spot welding or the like. It is fixed well.

Furthermore, one or more oil return holes 30c are provided between the through hole 30a and the outer edge 30b of the partition plate 300, and a check valve 31 is installed on the lower surface of the partition plate 30 so as to cover the oil return hole 30c. It is being

Here, the oscillating scroll 2 is engaged with the fixed scroll 1, and the oscillating scroll shaft 2b is attached to the oscillating bearing 18.
The main shaft 6 is engaged with the main shaft 6 via the pivot bearing 18 and supported by the swing bearing 18 and a first thrust bearing 21 disposed on the bearing frame 8 .

Furthermore, the main shaft 6 is supported by a first main bearing 19, a second main bearing 20, and a second thrust bearing 21, which are arranged in bearing frames 8 and 9 that are connected to each other by a dowel or the like. 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 own axis and to allow only revolution movement.

In this state, the fixed scroll 1 is mounted on the bearing frame 8.
, 9 are tightened together with bolts or the like. Further, the motor/rotor 10 is press-fitted into the main shaft 6, and the motor/stator 11 is press-fitted into the bearing frame 9.

Fixed by shrink fitting or screws. Furthermore, the oil cap 7 is fixed to the main shaft 6 by press fitting, shrink fitting, or the like. The mechanical section assembled in this way has a shell 1 with the fixed and oscillating scrolls 1 and 2 on the top and the motor rotor and stator 10, 11 on the bottom.
It is accommodated and fixed in the inside of 2 by press-fitting, shrink-fitting, etc.

Next, we will explain the operation of the scroll compressor configured in this way.When the zero mode rotor lO rotates, the main shaft 6
The oscillating scroll 2 begins to revolve through the Oldham joint 13 and the compression begins according to the operating principle explained in FIG.
As shown by the solid arrow, the motor cools the motor by passing through the communication hole 27 between the bearing frame 9 and the motor stator 11, the air gap between the motor rotor 10 and the motor stator 11, etc. The compressed gas is taken into the compression chamber 5 through the suction port 3 provided in the fixed scroll 1 through the communication hole 28 between the rear shell 12 and the bearing frames 8 and 9, and is compressed. through the discharge pipe 1
7 and is discharged from the compressor. In addition, the lubricating oil is passed 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 from the oil reservoir 15. Each bearing 18, 20 is oiled, and from the bearing 18, bearings 21, 19, 22 are oiled. The oil used for lubrication mainly flows through oil return holes 2 provided in the bearing frames 8 and 9.
5.26 and accumulates on the upper surface of the partition plate 30. here\
Due to the oil head difference, the check valve 31 opens and the oil return hole 30 opens.
The oil is returned to the oil reservoir 15 through the through hole 30a.

Furthermore, a baffle plate 14 is provided to close the gap between the bearing frame 8 and the outer peripheral surface of the swinging scroll 2 so that oil leaking from the bearing 21 etc. is not directly sucked into the suction port (suction chamber) 3. The suction port (suction chamber) 3 and the sliding mechanism are separated by a baffle plate 14 and an oscillating scroll 2.In addition, the gas vent hole 24 provided in the main shaft 6 is used as an oil cap during operation. The gas inside the pump is quickly discharged to the outside of the shaft, increasing the efficiency of the pump. If the refrigerant is trapped in the lubricating oil in the oil reservoir 15 and foaming occurs at startup, etc., the check valve 31 is stopped due to the differential pressure caused by the foaming, and the oil flows upward through the oil return hole 30c. Prevents backflow to.

[Problem that the invention seeks to solve]

Conventional scroll compressors are constructed as described above, so foreign matter such as iron powder, copper powder1, or fine dust generated during compressor assembly or refrigeration cycle operation gets mixed into the lubricating oil, causing the above-mentioned problems. It is deposited on the upper surface of the partition plate 30, and the through hole 3
0a and flows into the lower oil reservoir 15, and the main shaft 6
The oil is sent to the bearings 21, 19, 22 through the suction lower a of the oil cap 7 and the oil supply hole 23 arranged in the oil cap 7. As a result, phenomena such as damage, seizure, and wear occur on the sliding surfaces of the bearings, which may significantly reduce the performance and reliability of the compressor. It is possible to prevent foreign matter such as iron powder, copper powder or fine dust mixed in lubricating oil from being sent to the sliding surfaces of bearings, etc. The purpose of the present invention is to obtain a highly reliable refrigerant compressor that can separate lubricating oil from foreign substances such as dust mixed in lubricating oil.

[Means for solving problems]

The refrigerant compressor according to the present invention has a through hole through which the main shaft passes through so that the lower end of the main shaft is immersed in the oil sump, and a strainer having a foreign matter trapping function is attached to the partition plate that covers the upper part of the oil sump. [Wrest] In this invention, which is attached to cover the lower end, in this invention, the partition plate is installed so that the strainer covers the lower end of the main axis ・ Mixed in lubricating oil, copper flour, copper flour, and fine fine. If fine dust mixed in lubricating oil flows into the strainer through the gap between the through hole of the partition plate and the main shaft, it will not be possible to enter the suction hole and oil supply hole of the oil cap. It is released to the outside of the strainer due to the centrifugal force caused by the stirring action of the lubricating oil due to rotation.

[Embodiments of the invention]

An embodiment of the present invention will be explained below with reference to the drawings.〇 Fig. 1 is a sectional view showing an embodiment of the present invention, and 1 to 30 are identical to the conventional device described above, so the same reference numerals are used. The explanation will be omitted, and the explanation will focus on the different parts.

32 is a strainer, and this strainer 32 is arranged so as to cover a through hole 31 that allows the lower end of the main shaft 6 provided in the partition plate 30 to penetrate into the oil reservoir 15, and its mounting flange 33 is spot welded or screwed. The strainer 32 is fixed to the oil sump 15 side of the partition plate 30 with a coarse mesh 32.
A fine mesh 3 made of porcelain and has a double structure along the inner circumference up to the lower half of the coarse mesh 32a portion of the side local part.
2b is inscribed therein, and a fine mesh 32c is provided on the bottom surface that covers the lower surface of the oil cap 7 disposed at the lower end of the main shaft. In the scroll compressor of the invention, the strainer 32 attached to the partition plate 30
covers the oil cap 7 placed at the lower end of the spindle.
Prevents iron powder, copper powder, and fine dust mixed in the lubricating oil from flowing into the suction hole 7a of the oil cap 7 and the oil supply hole 23. Also prevents dust mixed in the suction gas and sucked into the compressor. Foreign matter mixed in the lubricating oil after lubricating the bearing passes through the oil return holes 25 and 26 and collects on the partition plate 30. Flows into the reservoir, and some of it also flows through the partition plate 300 through hole 30m
It flows into the strainer 32 through the gap between the main shaft 6 and the main shaft 6.

The foreign matter that has flowed in together with the lubricating oil is blown to the outer circumference by the centrifugal force caused by the stirring action of the lubricating oil in the oil reservoir 15 due to the rotation of the main shaft 6. The oil does not directly flow into the suction hole 70 and oil supply hole 23 of the oil cap 7 from inside the strainer 32.

It should be noted that the configuration and operation other than those described above are the same as those of the conventional system, and will therefore be omitted.

In the above embodiment, the side local part of the strainer 32 has a double structure consisting of a coarse mesh member and a fine mesh member provided inscribed in the lower circumferential part. As in the embodiment, only the lower half between the partition plate 30 and the oil cap 7 disposed at the lower end of the main shaft 6 is covered with a fine mesh member, and the upper half is made up of only a plurality of supports 34. It goes without saying that similar effects can be expected with the configuration.

〔Effect of the invention〕

As explained above, this invention prevents iron powder and copper powder mixed in lubricating oil by attaching a strainer to the partition plate that covers the upper part of the oil reservoir so as to cover the oil cap placed at the lower end of the main shaft. This prevents foreign matter such as fine dust from entering the sliding parts of the 1-bearing, and foreign matter that has entered the strainer is carried out of the strainer by agitation of lubricating oil by the rotation of the main shaft, and is transferred from inside the strainer to the bearing. This has the effect of providing a highly reliable refrigerant compressor that does not flow into sliding parts such as.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view of a main part showing another embodiment of the invention, FIG. 3 is a perspective view of the main part, and FIGS. 4 a to 4 d are , Operating Principle of Scroll Compressor - Figure 5 is a sectional view showing a conventional scroll compressor. 8゜9 is a bearing frame, 10 is a moder rotor, 11 is a motor stator, 12 is a shell, 15 is an oil reservoir, 16 is a suction pipe, 17
is a discharge pipe, 19.20 is the first and second main bearings, 30 is a partition plate, 30a is a through hole 130C is an oil return hole, 32 is a strainer, 33 is a strainer mounting 7, lungy 32a is a rough mesh member, 32b , 32c is a fine mesh member, and 34 is a plurality of supports. Agent Masuo Oiwa (and 2 others) IW! lJ, F2C...-Kami O-bu 22m spear a Zu spear 4 diagram
(≦()0°2・F5 diagram procedural amendment (voluntary) Showa v1 corner Tao

Claims (3)

[Claims] (1) A frame having a compression chamber, a compression section forming the compression chamber, a main shaft for compressing the fluid drawn into the compression chamber, and a main bearing for rotatably supporting the main shaft; a motor that rotates the main shaft; a shell that has an oil reservoir at the bottom and houses the compressor at the top and the motor at the bottom so that the lower end of the main shaft is immersed in the oil reservoir; An oil hole that opens at the lower end of the main shaft and is formed in the main shaft and supplies lubricating oil in the oil reservoir to the main bearing through the opening at the lower end of the main shaft as the main shaft rotates; In this refrigerant compressor, the refrigerant compressor has a through hole that penetrates the main shaft with a predetermined gap around the main shaft, and has a partition plate that covers the upper part of the oil sump, and a strainer having a foreign matter trapping function is installed at the lower end of the main shaft. A refrigerant compressor, characterized in that it is attached to the partition plate so as to cover it. (2) The entire strainer is formed of a coarse mesh member,
2. The refrigerant compressor according to claim 1, wherein a fine mesh member is disposed only in the lower part of the refrigerant compressor. (3) The refrigerant compressor according to claim 1, wherein the strainer is provided with a net-like member only at its lower part, and its upper part is constituted only by a plurality of struts.