JPS63215892A - Scroll compressor - Google Patents

Abstract

PURPOSE:To get rid of a pressure differential in a pair of compression spaces as well as to prevent an abnormal vibration from occurring, by setting these paired compression spaces in holding the center in between, and forming a connecting passage to be first opened to one side of these compression spaces so as to be interconnected to a discharge port in the center of an end plate of a fixed scroll. CONSTITUTION:A scroll compressor part 4 to be driven by the motor part housed in a hermetically sealed vessel 1 has both fixed and turning scrolls 14 and 15 made up of erecting spiral laps 18 and 23 to be mutually engaged with each of disclike end plates 16 and 22. And, plural compression spaces 25 to be formed between opposed surfaces of both these laps 18 and 23 are contacted of their capacity with rotation of the turning scroll 15 whereby a fluid is compressed, and it is discharged out of the discharge port 19 formed in the center of the end plate 16 of the fixed scroll 14. In this case, a passage groove 30 to be first opened to one side compression space 15 in symmetrical paired compression spaces 25 holding the center in between is formed in the end plate 16 of the fixed scroll 14 after being interconnected to the discharge port 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement in a scroll compressor in which refrigerant compressed in a pair of compression spaces is simultaneously discharged from discharge holes.

(b) Conventional technology Conventional scroll compression/iso
The structure is as shown in Japanese Patent No. 293. Here, a conventional example will be explained with reference to this publication. In FIGS. 5 and 6, 50 is a closed container, and a scroll compressor section 51 and an electric motor section 52 are built in this container. The scroll compression section 51 includes a fixed scroll 53, an orbiting scroll 54, an Oldham ring 55, a rotating shaft 56,
It mainly consists of a frame 57 and metal bearings 58.

The fixed scroll 53 includes a spiral wrap 60 standing upright on the end plate 59, and the wrap 60 is formed of an involute curve or a curve close to it. Further, an inlet 61 for the compressed gas is provided on the outer periphery, and a discharge hole 62 is provided in the center of the end plate 59, respectively. The fixed scroll 53 is fixed to the frame 57. On the other hand, the orbiting scroll 54 includes an end plate 63 and a spiral wrap 64 standing upright thereon. Fixed scroll 53
and each lap 60.64 of the orbiting scroll 54
The shapes of the two are symmetrical with respect to each other, and are shifted by 180 degrees. Furthermore, since the fixed scroll 53 and the orbiting scroll 54 are engaged with each other with the centers of their spirals shifted by the radius of revolution, the two wraps 60.6
4 are in contact at a plurality of points to form a plurality of pressure i spaces 65. Further, a rotating shaft 56 is provided on the back of the orbiting scroll 54.
A boss portion 66 is provided into which the holder is inserted.

The rotating shaft 56 is supported by a frame 57 via a metal bearing 58, and a rotor 67 of the electric motor section 52 is attached to one blade end, and the other end is inserted into a boss section 66 of the orbiting scroll 54.

The wrap 60 of the fixed scroll 53 is the orbiting scroll 54
The starting angle of the winding is made larger than that of the wrap 64 shown in FIG. That is, the fixed scroll 53 has a shorter wrap tip than the orbiting scroll 54.

In the scroll compressor of this structure, the winding start portion of the wrap 60 of the fixed scroll 53 is shortened, and a compression space 65A formed by the outer wall of the fixed scroll and the inner wall of the orbiting scroll 54, and the inner wall of the fixed scroll 53 and the orbiting scroll are formed. The compression space 65B formed by the outer wall of 54 is communicated with the discharge hole 62 at the same time through a large flow path during the initial discharge stroke, thereby preventing overcompression from occurring in one compression space 65A.

(C) Problem to be Solved by the Invention However, since the length of the winding start portion of the wrap 60 of the fixed scroll 53 is shortened by increasing the winding start angle of this winding start portion, the length of the wrap 64 of the orbiting scroll 54 is shortened. Before the winding start part separates from the wrap 60 of the fixed scroll 53, it separates from the wrap 64 of the orbiting scroll 54 and the compression space 65A first communicates with the discharge hole 62. There was a problem in that a pressure difference occurred and the pressure imbalance caused abnormal vibrations and noise in the scroll compressor.

In order to solve the above-mentioned problems, this invention provides a communication passage in a pair of compression spaces in the end plate of a fixed scroll, which opens first in one of the compression spaces so as to communicate with the discharge hole. The purpose of this is to make the compression space communicate with the discharge hole at the same time, and to prevent a pressure difference from occurring between the pair of compression spaces.

(d) Means for Solving the Problems This invention forms a plurality of compression spaces with a fixed scroll and an orbiting scroll, and each pair of compression spaces is arranged symmetrically with the center in between. A discharge hole for discharging the refrigerant formed and compressed in the pair of compression spaces is provided in the center of the end plate of the fixed scroll. A communication passage that opens first is provided in communication with the discharge hole.

(E) Function This invention is configured as described above, so that one communication passage is provided in the end plate of the fixed scroll and communicates with the discharge hole.
First, one of the pair of compression spaces is opened,
This pair of compression spaces communicates with the discharge hole at the same time, so that the pressure in the pair of compression spaces changes equally.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 to 4.

Reference numeral 1 denotes a closed container, and this container is composed of a cylindrical case 3 to which the electric motor section 2 is attached, an upper lid body 5 to which the scroll compressor section 4 is attached, and a lower lid body 7 having an oil reservoir 6 in which oil is stored. has been done.

A frame 8 fixed to the scroll compressor section 4 is mounted on the upper end surface of the cylindrical case 3. A bearing portion 10 for pivotally supporting the rotating shaft 9 is integrally provided at the center of the frame. The electric motor section 2 includes a stator 11 attached to the inner wall of a cylindrical case 3, and an air gap 12 inside the stator.
The rotor 13 is intubated into the rotating shaft 9 through the rotor 13.

The scroll compressor section 4 is composed of a fixed scroll 14 and an orbiting scroll 15. The fixed scroll 14 includes a disc-shaped end plate 16 that partitions the inside of the closed container 1 into upper and lower parts, an annular wall 17 that projects from the periphery of one side of this end plate, and is surrounded by the annular wall and is surrounded by the end plate 16. A spiral wrap 18 made of an upright involute shape or a curved line approximating it
It is made up of. A discharge hole 19 is provided in the center of the end plate 16 of the fixed scroll 14. The fixed scroll 14 is arranged so that the annular wall 17 and the wrap 18 project downward, and the annular wall is attached to the mounting leg 2 on the periphery of the frame 8.
0 with bolts 21. Orbiting scroll 15
consists of an end plate 22, a spiral wrap 23 formed of an involute shape or a curved line approximating the involute, and a pin bored in the center of the other surface of the end plate 22. It consists of a section 24. The orbiting scroll 15 is configured such that the projecting direction of the wrap 23 is upward, and the wrap faces and engages with the wrap 18 of the fixed scroll 14 to form a plurality of compression spaces 25 inside. 26 is a boss hole provided at the tip of the rotating shaft 9 into which the pin portion 24 of the orbiting scroll 15 is inserted;
The center of this boss hole is provided eccentrically from the axis of the rotating shaft 9.

A balance weight 2 is attached to the rotating shaft 9 around the boss hole 26.
7 are integrally provided. 28 is a fixed scroll 14
This is an Oldham ring that causes the orbiting scroll 15 to revolve on a circular orbit so as not to apparently rotate. A suction passage 29 is formed on the outer periphery of the frame 8 to introduce the refrigerant to the scroll compressor section 4 .

In the end plate 16 of the fixed scroll 14, among a pair of compression spaces 25A and 25B formed symmetrically with the center in between, a passage groove 30 that opens first in one compression space 25B is connected to the discharge hole 1.
It is provided in communication with 9. Further, the discharge hole 19 is first opened to the other compression space 25A.

31 is a suction pipe, and this suction pipe opens into the closed container 1 below the motor part 2. 32 is a discharge pipe attached to the upper lid body 5, and this discharge pipe is connected to the upper lid body 5 and the fixed scroll 1.
It opens into an upper space 33 formed by the end plate 16 of No. 4.

In the scroll compressor configured in this manner, when the electric motor section 2 is rotated, its rotational force is transmitted to the orbiting scroll 15 via the rotating shaft 9.

That is, the orbiting scroll 15 is connected to the boss 1 (2) of the rotating shaft 9.
6 is driven by a pin portion 24 inserted eccentrically with respect to the axis of the rotating shaft, and is caused to revolve on a circular orbit with respect to the fixed scroll 14 by an Oldham ring 28 so as not to apparently rotate. The fixed scroll 14 and the orbiting scroll 15 gradually reduce the compression space 25 formed by these scrolls from the outside to the inside, and the suction pipe 3
The refrigerant that flows into the closed container 1 from 1, passes through the air gap 12 of the motor section 2, and flows through the suction passage 29 on the outer periphery of the frame 8 is compressed. This compressed refrigerant is discharged from the discharge hole 19 of the end plate 16 of the fixed scroll 14 into the upper space 33, and then discharged from the discharge pipe 32 to the outside of the closed container 1.

Passage groove 30 provided in end plate 16 of fixed scroll 14
is communicated with the discharge hole 19 so that one of the pair of compression spaces 25A, 25B first opens, so that the pair of compression spaces 25A, 25B are connected to the discharge hole 1.
9 at the same time to prevent a pressure difference from occurring in these compression spaces due to a difference in opening/closing timing, and to prevent this pressure difference from applying unnecessary force to the orbiting scroll 15 and causing abnormal vibrations and noise. There is. Moreover, the discharge hole 1
9 does not need to be provided to simultaneously open into the pair of compression spaces 25A and 25B, and the hole shape does not require special processing, so that hole processing can be easily performed. ing.

This invention allows a pair of compression spaces 25A and 25B to be communicated with the discharge hole 19 at the same time by providing a passage groove 30 in the end plate 16 of the fixed scroll 14 so as to communicate with the discharge hole 19. This is to prevent over-compression from occurring in one of the compression spaces 25B.

(G) Effects of the Invention The scroll compressor of the present invention forms a plurality of compression spaces with a fixed scroll and an orbiting scroll, and among these compression spaces, each pair of compression spaces is formed symmetrically with the center in between. A discharge hole for discharging the refrigerant compressed in the pair of compression spaces is provided in the center of the end plate of the fixed scroll. Since the communication passage opening to the discharge hole is provided in communication with the discharge hole, the discharge hole communicates with the pair of compression spaces at the same time, and the pressures of the refrigerant compressed in these compression spaces can be made approximately the same. It is possible to prevent abnormal vibrations and noise from occurring due to the pressure balance between the pair of compression spaces.

Moreover, since the discharge hole does not need to communicate with the pair of compression spaces at the same time, the hole shape does not require any special processing, and can be formed by simple processing.

[Brief explanation of the drawing]

1 to 4 illustrate the present invention, in which FIG. 1 is a longitudinal cross-sectional view of a scroll compressor, FIG. 2 is an enlarged cross-sectional view of essential parts showing the relationship between the wrap and the discharge hole just before the discharge stroke, and FIG. The figure is an enlarged cross-sectional view of the main part showing the relationship between the lamp and the discharge hole during the initial discharge stroke, FIG. 4 is an enlarged cross-sectional view of the main part of the fixed scroll, FIGS. 5 and 6 show the conventional example, and FIG. 6 is a longitudinal cross-sectional view of the scroll compressor, and FIG. 6 is a schematic cross-sectional view showing the fitted state of the fixed scroll and the orbiting scroll. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Electric motor part, 4... Scroll compressor part, 14... Fixed scroll, 1
5... Orbiting scroll, 16.22... End plate,
18゜23...Wrap, 19...Discharge hole, 25
... Compression space, 30... Passage groove.

Claims (1)

[Claims] 1. A compressor section is housed in the upper side of the airtight container, and an electric motor section is housed in the lower side, and the compressor section is housed in a fixed scroll having a spiral wrap erected on an end plate, and facing the fixed scroll. It is composed of an orbiting scroll having spiral wraps erected on end plates that engage with each other, the orbiting scroll is made to revolve around a fixed scroll so as not to apparently rotate, and the scroll is formed of a fixed scroll and an orbiting scroll. A plurality of compression spaces are sequentially reduced from the outside to the inside, and a pair of compression spaces are formed symmetrically with the center of the fixed scroll in the center of the end plate of the fixed scroll. In a scroll compressor provided with a discharge hole for discharging refrigerant, the end plate of the fixed scroll has a communication passage that first opens in one of the pair of compression spaces and communicates with the discharge hole. A scroll compressor characterized by being provided with.