JPH0291494A - Multicylinder rotary compressor - Google Patents

Abstract

PURPOSE:To improve the lubrication to vanes by providing the first communicating hole for feeding the lubricating oil to a vane chamber and the second communicating hole for communicating the upper vane chamber with the lower vane chamber. CONSTITUTION:When the operation is started, a communicating hole 27 opens, attending on the movement of a lower vane 15 to the left, and the volume of a vane chamber 17 is increased so as to be the negative pressure, and the lubricating oil 24 flows into the vane chamber 17 through the lower communicating hole 27. Next, when the lower vane 15 moves to the right, the lower communicating hole 27 is closed so that the oil pressure in the vane chamber 17 rises, and an upper vane 14 moves to the left so that the vane chamber 16 is made to be the negative pressure, and the lubricating oil 24 flows into the vane chamber 16 through a communicating hole 28. Next, when the upper vane 14 moves to the right, the oil pressure in the upper vane chamber 16 rises, and the lubricating oil 24 in the upper vane chamber 16 is exhausted to the outside of an upper plate 12 through an upper communicating hole 29.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to multi-cylinder rotary compressors, particularly to vane lubrication.

rPrior art] Fig. 2 shows a conventional multi-cylinder rotary compressor disclosed in, for example, Japanese Utility Model Application Publication No. 52-111401. (3)
(4) is a crankshaft that drives the compression element (3), (5) to c! The heart is a compressed element (3)
(5) is an upper cylinder supported on the inner periphery of the closed container (1; 61 is an upper cylinder (5)
A lower cylinder supported on the inner circumference of the closed container (11), (71 is a partition plate supported between the upper cylinder (5) and the lower cylinder (6), (8) is the upper cylinder (5) The upper compression chamber (9) is formed concentrically with the crankshaft (4) by the inner peripheral wall (5a) of the lower cylinder (
The lower compression chamber is formed concentrically with the crankshaft (4) by the inner circumferential wall (6al) of the crankshaft (4), <11 (lυ is
) is rotatably mounted on the eccentric part (4al +4b) of the upper and lower cylinders (F51 +61 inner peripheral wall (
5a) A rolling piston that rolls along (6a), (Ia is an upper plate that covers the upper part of the upper cylinder (5),
(12a) is a bearing part aJm! that is integrally formed with the upper plate a'3 and supports the upper part of the crankshaft (4). 9 is a plate-shaped vane that is pressed against the outer circumference of the rolling piston an (ti) and divides the upper and lower compression chambers (8) and (9) into a high pressure side (8a) and a low pressure side (9a); and lower cylinder +51 (inner peripheral wall of 61 +5al t6a
The vane (11
(A coil spring that presses Iυ in the axial direction. (Benin chamber housing 19, Q9 is an oil supply that penetrates the upper and lower cylinders (51 (6) and is provided to improve oil lubrication.) hole, f6 is a discharge valve that discharges the high-pressure refrigerant gas in the compression chamber (81+9), (c) is a valve holder that regulates the stroke of the discharge valve handle, and (F) is a valve holder that regulates the stroke of the discharge valve handle; The stored lubricating oil (c) is a discharge pipe that discharges high-pressure refrigerant gas. Also, the rank shaft (eccentric part of 41 + 4a) (4bl is formed with a phase difference of 180 degrees).

Next, the operation will be explained. Due to the rotation of the crankshaft (4), the eccentric part +4a) (4b) performs eccentric movement with a phase difference of 180 degrees, and the rolling piston (11) αp attached to the eccentric part (4al (4b)) moves between the upper and lower cylinders. It rolls along the inner circumferential wall 15al (6a).In Fig. 3, if the rolling direction of the rolling piston (1
) is reduced, and the area of the low pressure side (8b) is increased.

As a result, the gas pressure on the high pressure side increases and reaches the specified pressure.

The discharge valve (to) opens, and the high-pressure gas is discharged to the electric element (2) side, and is discharged from the discharge pipe (to) to external piping. On the other hand, the gas pressure on the low pressure side (8b) decreases, so the suction pipe (
Low pressure refrigerant gas flows into the compression chamber (8) from c).

On the other hand, with the transfer of the Hoehn Iα halo ring piston 10αυ, it slides inside the vane chamber (ls (17+),
The oil level (to) of lubricating oil e24 is high and the oil supply hole (support) 01)
Since the vane chamber is immersed in lubricating oil through the vane (14), the vane (14) is sufficiently lubricated and operates smoothly.

(Problems to be Solved by the Invention) In conventional multi-cylinder rotary compressors, the oil level of the lubricating oil is not necessarily maintained at a height such that the vane chamber (Leaη) is immersed in the lubricating oil. , it may fluctuate due to load fluctuations or other changes in the state of the refrigeration cycle, and in such cases, it becomes difficult to lubricate the upper vane in particular, resulting in vane malfunction, abnormal wear, etc. There was a problem.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a highly reliable multi-cylinder rotary compressor that can provide better lubrication to the vanes. Means for Solving the Problem] The rotary compressor according to the present invention has a closed container.

A plurality of cylinders formed with compression chambers for compressing lubricating oil and refrigerant stored at the bottom of the container, a partition plate that partitions the cylinders, an upper bearing and a lower bearing that close the openings of the upper cylinder and the lower cylinder; A vane chamber provided in the cylinder, a vane housed in the vane chamber that partitions the compression chamber into a low pressure chamber and a high pressure chamber, and performs reciprocating motion, and a vane provided in the lower bearing with the vane located on the side of the compression chamber in the vane chamber. Open it at nine o'clock and close it when you move to the sealed container side.

A first communication hole for sending the lubricating oil to the vane chamber, and a second communication hole for communicating the upper and lower vane chambers, which are provided in the partition plate and open and close in the opposite state to the first communication hole. It is something.

(Function) In this invention, when the volume of the vane chamber changes due to the reciprocating movement of the vane and the volume of the vane chamber increases, lubricating oil is sucked from below due to the decrease in internal pressure, and when the volume of the vane chamber decreases, the volume of the vane chamber increases. , the flow path in the lower plate is closed and the lubricating oil is sent upward by increasing the internal pressure (Example) An example of the present invention will be described below with reference to FIG. @, Ol are exactly the same as the above conventional device. (5) is the communication hole provided in the lower bearing, Q&
is a communication hole provided in the partition plate (71), and @ is a communication hole provided in the upper bearing.

As configured above, rolling piston + Ilaυ
The vane t is driven in contact with the outer circumference due to the transfer of the vane t.
14 (1! inserts the end into the vane chamber (II (1?) and moves reciprocatingly, so the volume inside the vane chamber αec1η increases and decreases. Eccentric part +4a that drives the rolling piston αIal) +4bl is 180 degrees Therefore, when the volume of one vane chamber Ql increases, the volume of the other vane chamber decreases. Assuming that the height of the lubricant oil level (to) matches the height of the partition plate (7), the lower oil supply hole C11) is immersed in the lubricant oil. No lubricating oil is supplied to the upper oil supply hole clGK. When operation is started in this state, as the lower vane housing S moves to the left in the figure, the communication hole (2) opens and the volume of the vane chamber increases.
Due to negative pressure, lubricating oil flows through the lower communication hole.
flows into the vane chamber 9. Then the lower vane (I
When s moves to the right, the lower communication hole slope closes and the vane chamber α
The oil pressure in η increases, while the upper vane I moves to the left as shown, and the vane chamber +IGI becomes negative pressure, so the lubricating oil (c) in the lower vane chamber aQ passes through the communication hole @. and flows into the upper vane wall. Subsequently, when the upper vane a4 moves to the right, the oil pressure in the upper vane chamber increases, and the lubricating oil in the upper vane chamber ae flows upward through the upper communication hole (2). It is discharged to the outside of plate α2. The lubricating oil discharged to the outside of the upper plate aSS is transferred to the upper plate α2 and the closed container (
The water flows back to the bottom of the closed container (11) through the gap Go formed between the two.

〔Effect of the invention〕

According to the present invention, a closed container, a plurality of cylinders each having a compression chamber for compressing lubricating oil and refrigerant stored at the bottom of the container, a partition plate separating the cylinders, and openings between an upper cylinder and a lower cylinder are provided. An upper bearing and a lower bearing that are closed, a vane groove provided in the cylinder, a vane that is housed in the vane groove and that partitions the compression chamber into a low pressure chamber and a high pressure chamber and performs reciprocating motion, and a vane that is provided in the lower bearing and that makes a reciprocating motion. a first communication hole provided in the partition plate that opens when the vane groove moves to the compression chamber side and closes when the vane groove moves to the closed container side to send the lubricating oil to the vane groove; Since the structure is equipped with a second communication hole that communicates the upper and lower vane grooves, which are opened and closed in the opposite state to the communication hole, even if the lubricating oil level changes, the volume of the vane chamber due to the reciprocating movement of the vane is reduced. By utilizing this variation, lubricating oil can be supplied from the lower side to the upper vane chamber, resulting in the effect that the vane can be sufficiently lubricated.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a conventional multi-cylinder rotary compressor, and Fig. 3 is a cross-sectional view taken along the line ■-■ in Fig. 2. . In the figure, (11 is a closed container, (5) is a cylinder,
(6) is the cylinder (to), (7) is the partition plate, and a'a is the upper bearing. a3 is the lower bearing, α4f19 is the vane, aF3aη is the vane chamber 9@ is the lubricating oil, @ is the first communication hole, and @ is the second communication hole. In Figure 9, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A closed container, a plurality of cylinders each having a compression chamber for compressing lubricating oil and refrigerant stored at the bottom of the container, a partition plate that partitions the cylinders, and an upper bearing that closes the openings of the upper cylinder and the lower cylinder; a lower bearing, a vane chamber provided in the cylinder, a vane housed in the vane chamber that partitions the compression chamber into a low-pressure chamber and a high-pressure chamber and performs reciprocating motion; a first communication hole that opens when moving to the compression chamber side and closes when it moves to the closed container side to send the lubricating oil to the vane chamber; a first communication hole provided in the partition plate and opposite to the first communication hole; A multi-cylinder rotary compressor including a second communication hole that communicates the upper and lower vane chambers that are in an open/closed state.