JPS63243479A - Scroll compressor - Google Patents

Abstract

PURPOSE:To enhance a sealing effect so as to improve volumetric efficiency, by forming a hole, communicating with high pressure space in an enclosed vessel, in a scroll groove of fixed and turning scrolls so that high pressure gas is introduced to each scroll groove forcing each scroll to be brought into press contact. CONSTITUTION:An opening 2a of a frame 2, provided being arranged in an enclosed vessel 1, provides a main shaft 3 to be rotatably arranged, while the main shaft 3 mounts a centrifugal pump 3a and a rotor 5. And a turning scroll 7 is rotatably supported to a crankshaft part 3b formed in an upper part of the main shaft 3, while a fixed scroll 8 is fixed to a peripheral protrusion part 2b of the frame 2. In the above constitution, a scroll groove 7b of the turning scroll 7 forms a small hole 7d communicating with high pressure space 10 formed between an end plate 7a and the crankshaft part 3b. While a scroll groove 8b of the fixed scroll 8 forms a small hole 8d communicating with an oil reservoir 11 on an end plate 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a scroll compressor that can improve volumetric efficiency.

(Prior Art) A conventional scroll compressor has a structure in which a fixed scroll having a spiral wrap fixed to an end plate and an orbiting scroll are meshed with each other. By rotating the orbiting scroll so that both wraps are in contact with each other,
The compression chamber formed by both scrolls gradually decreases toward the center, and the fluid sucked in from the outer periphery of both wraps is compressed and discharged from the discharge boat in the center.

At this time, the temperature of the fluid gradually increases as it is compressed from the outer periphery of the low-pressure region to the center of the high-pressure region, becoming high in the center of the scroll and low in the outer periphery.

(Problem to be Solved by the Invention) In the conventional technology, since the wrap is fixed to the end plate, the wrap is thermally expanded in the center of the high temperature area due to the influence of heat, and the height of the wrap increases. becomes gradually higher toward the center. 17 Therefore, axial sealing can be maintained at the center of the wraps of the fixed scroll and orbiting scroll, but axial sealing cannot be maintained at the outer periphery, making it easier for compressed gas to leak and reducing volumetric efficiency. There was a problem in which the value decreased significantly.

The present invention was developed in view of the above-mentioned problems, and an object of the present invention is to provide a scroll compressor that can enhance the sealing effect between the fixed scroll and the orbiting scroll and improve the volumetric efficiency.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a fixed scroll and an orbiting scroll in which a spiral wrap is inserted into a scroll groove formed on opposing surfaces of a pair of end plates. A scroll compressor in which orbiting scrolls are engaged with each other to orbit, characterized in that each of the scroll grooves is provided with a hole that communicates with a high-pressure space within a closed container.

(Function) When high-pressure gas is introduced into both scroll grooves through the holes, both wraps are pressed against the opposing mirror plate by the high-pressure gas. At this time, while the pressure inside the scroll groove is high, the pressure in the compression chamber surrounded by both wraps becomes lower as it gets closer to the outer periphery. Therefore, the pressing force acts strongly toward the outer periphery and presses against the entire wrap. It can be evenly pressed against the side mirror plate.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view showing a schematic configuration of a scroll compressor according to the present invention.

In the figure, reference numeral 1 denotes a closed container, the interior of which is divided into two spaces communicated by a frame 2. There are two circular openings 2a in the center of the frame 2, and a main shaft 3 is rotatably supported in the openings 2a and 2a. This main shaft 3 has an airtight container 1
A centrifugal pump 3a is provided for pumping lubricating oil 4 stored at the bottom of the container 1 into the compression mechanism.A rotor 5 is attached to the lower part of the main shaft 3, and a stator 6 is attached to the outer periphery of the closed container 1. is press-fitted into the

An orbiting scroll 7 is rotatably supported on a crankshaft 3b formed at the upper part of the main shaft 3, and a fixed scroll 8 is fixed to an outer circumferential protrusion 2b of the frame 2. The orbiting scroll 7 and fixed scroll 8 used here have involute curve wraps 7 in scroll grooves 7b and 8b formed on opposing surfaces of end plates 7a and 8a.
c.

8C is slidably inserted in the vertical direction, and the wrap 7c of the orbiting scroll 7 and the fixed scroll 8
A compression chamber is formed by the wraps 8C interlocking with each other. For example, an Oldham ring 9 is provided between the orbiting scroll 7 and the frame 2 as a mechanism for preventing rotation of the orbiting scroll 7 during its orbiting motion.

A small hole 7d is formed in the scroll groove 7b of the orbiting scroll 7 and communicates with the high pressure space 10 formed between the end plate 7a and the crankshaft 3b, and a small hole 7d is formed in the scroll groove 8b of the fixed scroll 8 on the upper surface of the end plate 8a. Formed oil sump 11
A small hole 8d that communicates with is formed.

Reference numeral 12 denotes a flow passage formed on the upper surface of the end plate 8a and guiding the gas from the suction pipe 13 to the outer periphery of both the wraps 7c and 8c. A check valve is provided to prevent backflow of gas.

15 is a discharge port provided through the end plate 8a and the lid body 14, and 16 is a discharge pipe attached to the side surface of the closed container 1.

When the scroll compressor having the above structure starts operating, the main shaft 3 starts to rotate in conjunction with the rotor 5, and the orbiting scroll 7 performs an orbiting motion. Then, both laps 7c
, 8c is gradually compressed toward the center and discharged into the closed container 1 from the discharge port 15 located in the center. The high pressure gas inside the closed container 1 is discharged to the outside through the discharge pipe 16.

Lubricating oil 4 stored at the bottom of the closed container 1 is pumped up by a centrifugal pump 3a within the main shaft 3 and supplied to the high pressure space 10. This high pressure oil is injected into the scroll groove 7b of the orbiting scroll 7 through the small hole 7d. Furthermore, the lubricating oil contained in the high-pressure gas discharged from the discharge port 15 becomes oil droplets and is collected in the oil reservoir 11, and this lubricating oil is injected into the scroll groove 8b of the fixed scroll 8 through the small hole 8d. .

By the way, as the fluid is compressed, the center portions of the orbiting scroll 7 and the fixed scroll 8 become hot, so the heights of the wraps 7c, 8c gradually increase toward the center portions due to the influence of this heat. At this time, the compression chamber formed by both wraps 7c and 8c has a lower pressure closer to the outer periphery, so the scroll groove 7b.

The pressing force of the wraps 7c and 8c acts strongly toward the outer circumferential side due to the high pressure oil injected into the wrap 8b. As a result, the entire wraps 7c and 8a are the mirror plate 8a on the other side.

7a is appropriately pressed.

Therefore, according to such a configuration, even if the heights of the wraps 7c and 8c differ due to the high heat generated during compression, the high pressure oil injected into the scroll grooves 7b and 8b moves the wraps 7c and 8c to the opposite end plate 8a. , 7a, the sealing effect is better than that of the conventional one, and as a result, gas leakage from the compression chamber is extremely small, and volumetric efficiency can be significantly improved.

Moreover, by injecting lubricating oil into the scroll grooves 7b and 8b, the sealing effect between the wraps 7c and 8c and the scroll grooves 7b and 8b is improved, and lubricating oil can be supplied between the scrolls 7 and 8, and between each compression chamber. Since the sealing effect of the scroll 7.8 and the lubrication effect of the scroll 7.8 are improved, the volumetric efficiency can be further improved, and the wear resistance of the wraps 7c and 8c can also be improved.

Next, another embodiment of the present invention will be described using FIG. 2.

FIG. 2 shows a compression mechanism section of a scroll compressor according to the present invention, in which elastic bodies 21.2 are provided in scroll grooves 7c and 8c.
It has a structure in which 2 is inserted. The structure of other parts is the first
Since it is the same as the embodiment shown in the figure, the same reference numerals are given and the explanation will be omitted.

According to this second embodiment, it is possible to obtain the same effects as those of the first embodiment, and when the pressure inside the closed container 1 does not rise at the initial stage of compression, the elastic body 21, 22
Due to the elastic force of the wraps 7c and 8c, the opposite end plate 8a
Since it can be brought into pressure contact with 7a, the volumetric efficiency can be improved even at the initial stage of compression operation.

Note that the present invention is not limited to the above embodiments,
Various modifications can be made without changing the gist.

For example, the holes provided in each scroll groove may be provided at any position as long as they communicate with the high pressure space.

[Effects of the Invention] According to the present invention, it is possible to provide a scroll compressor that can enhance the sealing effect between the fixed scroll and the orbiting scroll and improve the volumetric efficiency.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of one embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing another embodiment of the present invention. 1... Airtight container 2... Frame 2a...
・Opening 2b...Outer peripheral protrusion 3...Main shaft 3a...Centrifugal pump 3b...Crankshaft 4...Lubricating oil 5...Rotor 6
...Stator 7...Orbiting scroll 8...Fixed scroll 7a, 8a...End plate 7b, 8b...
Scroll grooves 7c, 8c... Wraps 7d, 8d...
・Small hole 9...Oldham ring 10...High pressure space 1
1... Oil sump 12... Flow path 13... Suction pipe 14... Lid body 15... Discharge boat
16...Discharge pipe 21.22...Elastic body

Claims (2)

[Claims] (1) A scroll compressor in which a fixed scroll and an orbiting scroll, which are formed by inserting a spiral wrap into scroll grooves formed on opposing surfaces of a pair of end plates and an orbiting scroll, are engaged with each other and the orbiting scroll is rotated; and a scroll compressor, characterized in that each scroll groove of the orbiting scroll is provided with a hole that communicates with a high pressure space within a closed container. (2) The hole is provided with means for supplying lubricating oil to the opening on the high pressure space side.
Scroll compressor as described in section.