JPH03246392A - Multiple cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To secure oil amount to be supplied into an upper cylinder and a bearing part by having the difference in the length in the axial direction of a lower cylinder and a roller smaller than the difference in the length in the axial direction of the upper cylinder and the roller. CONSTITUTION:A first gap 22 is provided between a bearing part 15 and a first roller 11. A second gap 23 is provided between a partition 6 and a second roller 12. The second gap 23 is smaller than the first gap 22 in width in the axial direction. When an amount of refrigerant contained in oil in an oil reservoir 2 is large, in rising through an oil supply hole 17 of a rotation axis 3, separation of the refrigerant contained in the oil and the flow from a second outlet hole 21 on the lower side into a second cylinder 8 through the second gap 23 of the second roller 12 is limited. Thus, an amount of oil supplied into a first cylinder 7 can be secured.

Description

Detailed Description of the Invention (a) Industrial Application Field This invention adjusts the amount of oil supplied to the lower cylinder to ensure the amount of oil supplied to the upper cylinder and bearing. This invention relates to a multi-cylinder rotary compressor.

(B) Prior art A conventional multi-cylinder rotary compressor uses common compressor parts for the upper and lower sides of the intermediate partition plate. Therefore, the clearance dimensions between the upper cylinder and the roller and between the lower cylinder and the roller are approximately the same, and the gaps between the upper end surfaces of the upper and lower rollers are the same. The amount of oil supplied to each sliding part from the oil supply hole of the rotating shaft is approximately the same amount supplied into each cylinder from the upper end surface of each roller, so that wear due to lack of oil does not occur in each sliding part. .

(For example, see Utility Model Application Publication No. 1-74393).

Since the clearance between the upper end surface of the lower roller and the upper end surface of the lower roller is approximately the same Ut clearance, if there is a large amount of refrigerant contained in the oil in the oil reservoir in the sealed container, the refrigerant contained in this oil will drop. It becomes easier to flow into the side cylinder through the upper end surface of the roller, and the oil flows together with the above-mentioned refrigerant, reducing the amount of oil supplied to the upper cylinder and bearing, and causing wear due to lack of oil. there were.

This invention solves the above problem, and is a multi-cylinder rotary compression system that limits the amount of oil supplied to the lower cylinder and secures the amount of oil supplied to the upper cylinder and bearings. The purpose is to provide a machine.

(d) Means for Solving the Problems This invention comprises an electric element having a rotating shaft at the upper part of the airtight container having an oil reservoir at the bottom, and a rotary compression element driven by the electric element at the lower part. The rotary compression element is housed in an intermediate partition plate, cylinders provided above and below this partition plate, and 18 cylinders respectively mounted on the rotating shaft.
Eccentric parts provided with a rotation angle shifted by 0°, and a roller that fits into these eccentric parts and rotates within the cylinder with a length in the axial direction shorter than that of the cylinder,
In a multi-cylinder rotary compressor, the lower cylinder is configured with a bearing portion that seals the opening of each cylinder, and the rotary shaft is provided with an oil supply hole for supplying oil from an oil reservoir to each sliding portion. The difference in length in the axial direction between the upper cylinder and the roller is made smaller than the difference in length in the axial direction between the upper cylinder and the roller.

(e) Effect By having the above structure, the present invention makes the difference in length in the axial direction between the lower cylinder and the roller smaller than the difference in length in the axial direction between the upper cylinder and the roller. , when the amount of refrigerant contained in the oil in the oil reservoir is large,
The amount of refrigerant flowing into the lower cylinder through the upper end surface of the roller is suppressed to limit the amount of oil, thereby ensuring the amount of oil supplied to the upper cylinder and the bearing.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container having an oil reservoir 2 at the bottom, and inside this container there is an electric element 4 having a rotating shaft 3 at the top, and a rotary compression element 5 driven by the electric element on the hinge. are stored respectively. The rotary compression element 5 includes an intermediate partition plate 6, a first cylinder 7 and a second cylinder 8 attached above and below this partition plate, and an eccentric part 9 provided on the rotating shaft 3 with a rotation angle shifted by 180 degrees. , 10, and a first roller 1 that is fitted into these eccentric portions and rotates within these cylinders with a length in the axial direction that is shorter than that of the first and second cylinders 7.8.
1 and 2 rollers 12, vanes 13 and 14 that are in contact with these rollers and partition the inside of the first and second cylinders 7.8 into a high pressure chamber and a low pressure chamber, and the first and second cylinders 7.8. 8
It is comprised of an upper bearing part 15 and a lower bearing part 16 that close the openings of the respective parts. An oil supply hole 17 is provided inside the rotating shaft 3 in the axial direction.

Reference numeral 18 denotes a first space formed by the rotating shaft 3 of the rotating compression element 5 and the tenth roller 11, and a lead-out hole 19 provided in the rotating shaft 3 and opening to the oil supply hole 17 communicates with this first space. There is. A second space 20 is also formed by the rotating shaft 3 and the second roller 12, and a lead-out hole 21 provided in the rotating shaft 3 and opening into the oil supply hole 17 communicates with this second space.

A first gap 22 is provided between the upper bearing portion 15 and the first roller 11. A second gap 23 is provided between the intermediate partition plate 6 and the second roller. The second gap 23 has a narrower width in the axial direction than the first gap 22.

24 is a discharge pipe attached to the earthen wall of the closed container 1.

In the multi-cylinder rotary compressor configured in this way, the first
・The refrigerant that has flowed into the second cylinder 7.8 is
The powder is compressed by the rollers 11, 12 and the vanes 13, 14, and is completely discharged into the closed container 1, and is then discharged through the electric element 4 from the discharge pipe 24 to the outside. Also, airtight container 1
The oil in the oil pipe 2 at the inner bottom rises through the oil supply hole 17 of the rotary shaft by the rotation of the rotary shaft 3, and flows through each outlet hole 19, 21.
is supplied into the first and second spaces 18.20. The oil in the first and second spaces 18.20 flows through the first and second gaps 22.2 between the upper end surfaces of the first and second rollers 11 and 12.
3 into the first and second cylinders 7.8,
Each sliding part is lubricated.

The second gap 23 between the second roller 12 and the first roller 11
By making the width in the axial direction narrower than the first gap 22, when the amount of refrigerant contained in the oil in the oil reservoir 2 is large, the oil is The refrigerant contained in the
1 to the second roller 12 through the second gap 23 of the second roller 12.
The flow into the cylinder 8 can be restricted. Therefore, the oil rising up the oil supply hole 17 is
This makes it easier to supply the first lead-out hole 19 and the upper bearing portion 15 above the lead-out hole 21 .

Moreover, since the rotary compression element 5 only narrows the second gap 23 between the lower intermediate partition plate 6 and the second roller 12, an increase in the sliding resistance of the first and second rollers 11 and 12 is prevented. I'm trying to keep it under control.

In this invention, the second gap 23 of the lower second roller 12 is made narrower than the first gap 22 of the upper first roller 11. Effects As described above, according to the present invention, the difference in length in the axial direction between the lower cylinder and the roller is made smaller than the difference in length in the axial direction between the upper cylinder and the roller.
The flow of oil into the lower cylinder, which is first supplied from the oil supply hole of the rotating shaft, can be restricted, and the amount of oil supplied into the upper cylinder can be ensured. Moreover, since this invention only narrows the gap between the upper end surfaces of the lower roller, it is possible to suppress an increase in the sliding resistance of the rollers.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a multi-cylinder rotary compressor showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of essential parts of the same multi-cylinder rotary compressor. DESCRIPTION OF SYMBOLS 1... Sealed container, 3... Rotating shaft, 4... Electric element, 5... Rotating compression element, 6... Intermediate partition plate, 7... First cylinder, 8... Second cylinder, 9.10... Eccentric part, 11... First roller, 12... Second roller, 15...
Upper bearing part, 16... Lower bearing part, 17... Oil supply hole, 22... First gap, 23... Second gap.

Claims (1)

[Claims] 1. An electric element having a rotating shaft at the upper part and a rotary compression element driven by the electric element at the lower part are housed in a closed container having an oil reservoir at the bottom, and the rotary compression element is inside the container. A partition plate, a cylinder provided above and below the partition plate, an eccentric part provided on the rotating shaft with a rotation angle shifted by 180 degrees, and a partition plate that fits into these eccentric parts and has a length in the axial direction. It consists of a roller that rotates within the cylinder with a length shorter than the cylinder, and a bearing that seals the opening of each cylinder, and an oil supply hole is provided in the rotating shaft to supply oil from the oil reservoir to each sliding part. The multi-cylinder rotary compressor is characterized in that the difference in length in the axial direction between the lower cylinder and the roller is smaller than the difference in length in the axial direction between the upper cylinder and the roller. Cylinder rotary compressor.