JPH045490A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent an abnormal increase of a pressure in a compression chamber at the time of liquid compression by providing a regulating means to regulate a fixed scroll diametrically, a pin mechanism to regulate it in the direction of the circumference, and a spring mechanism to push it toward an oscillation scroll. CONSTITUTION:A cylindrical part 35c of the same height as a scroll side plate 35b of a fixed scroll 35 is provided on the outer circumferential side of the scroll side plate 35b, and the cylindrical part 35c is engaged with an inner diametric surface 36a of a frame 36. A bolt 37 for regulating the fixed scroll 35 diametrically is provided. A pin 39 penetrated a base plate 35a of the cylindrical part 35c and the upper end surface of the frame 36 for regulating the fixed scroll 35 in the direction of the circumference is provided at the upper end surface of the base plate 35a. A spring member 38 for pushing the fixed scroll 35 axially toward an oscillation scroll is provided. In the case a pressure in a compression chamber 10 is increased rapidly by production of liquid compression by liquid back or flooded start during operation of a scroll compressor, therefore, a pressure relief is achieved to restrict an abnormal pressure increase.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a scroll compressor used for compressing refrigerant in, for example, a refrigeration system or an air conditioner.

[Conventional technology]

FIG. 4 shows an overall cross-sectional view of a conventional scroll compressor disclosed in, for example, Japanese Patent Application Laid-Open No. 60-206998. A cylindrical first shell with a bottom having an oil reservoir 1a; 2 a cylindrical second shell welded to the inner peripheral surface of the opening of the first shell 1;
A camp-shaped third shell 3 is fixed to the outer peripheral surface of the opening of the second shell 2; 4 is a camp-shaped third shell provided inside the third shell 3 and both shells 1.2;
A main shaft 7 having an oil pump cylinder 5 facing inside and an oil supply hole 6 extending in the axial direction is supported by the main shaft 4 via a bearing 8, and supports an oscillating scroll end plate 7a and an oscillating scroll side plate 7b. An oscillating scroll 9 having a fixed scroll 9 is combined with the oscillating scroll 7 and has a fixed scroll end plate 9a and a fixed scroll side plate 9b, 1
0 is a compression chamber formed between this fixed scroll 9 and the oscillating scroll 7. 11 is a partition plate, 14 is a motor rotor provided above the partition plate 11 and fixed to the main shaft 4L, and 15 is a motor provided around the motor rotor 14 and fixed to a lower bearing support to be described later with bolts 16. It is a stator. 17 and 1
8 is an upper bearing support and a lower bearing support that respectively support the main shaft 4 via main bearings 19 and 20; 21 is a balancer chamber formed in the lower bearing support 18 of both of these bearing supports;
2 is a first balancer housed inside the balancer chamber 21 and provided above the main shaft 4; 23 is a second balancer provided below the first balancer 22 and attached to the motor rotor 14. Further, 24 is a thrust bearing interposed between the orbiting scroll 7 and the upper bearing support 17, and 25 and 26 are a gas intake pipe and a gas discharge pipe.

The partition plate 11 is provided to prevent the lubricating oil 27 from being depleted due to a forming phenomenon that occurs when the compressor is started after a long-term stop.

In the scroll compressor configured as shown in No. 2, when the main shaft 4 rotates by energizing the motor stator 15, the swinging scroll 7 swings eccentrically.
The refrigerant sucked in cools the upper part of the motor stator 15 and is compressed in the compression chamber 10. At this time, the lubricating oil 27 rises in the oil supply hole 6 due to the centrifugal pump action of the cylinder 5 and is supplied to the bearings 19, 20 and the bearing 8. The lubricating oil 27 is then discharged to the outside of the thrust bearing 24, passes through the oil return hole 13 of the partition plate 11, and is returned to the oil reservoir 1a.

[Problem to be solved by the invention]

By the way, in general, in air conditioning bags W (hereinafter referred to as air conditioning units), the air conditioning units may be stopped for a long period of time between seasons, and at this time, the refrigerant sealed in the air conditioning units may leak into the compressor. It condenses and liquefies and accumulates in the lubricating oil. Generally, this phenomenon is called stagnation, and this phenomenon occurs due to the compression method of the compressor installed in the air conditioning unit, and also occurs in the conventional scroll compressor mentioned above. may be completely filled with a mixture of liquid refrigerant and lubricating oil. In the conventional scroll compressor described above, the fixed scroll is bolted to the frame, and the movement of the oscillating scroll is also restricted by the Oldham joint and bearings, so when the compressor is started in the sleeping state described above, Liquid compression occurs within the compression chamber, which causes the interior of the compression chamber to rise rapidly, resulting in abnormally high pressure within the compression chamber, which causes the problem that the side plates of the fixed scroll and the oscillating scroll lack strength and are damaged.

This invention was made in order to solve the above-mentioned problems. During liquid compression, before the pressure in the compression chamber reaches an abnormally high pressure, the pressure is relieved in the shell internal space to prevent abnormal pressure rise, and the scroll side plate is The object is to obtain a scroll compressor that does not cause damage.

[Means to solve the problem]

A scroll compressor according to the present invention includes a fixed scroll and an oscillating scroll that combine spiral side plates respectively provided on a base plate to form a compression chamber between both spiral side plates;
A frame that houses the swinging scroll and has a cylindrical outer circumference, a main shaft that rotationally drives the swinging scroll, a shell that fixes the fixed scroll and the swinging scroll to the frame outer circumference and hermetically stores them, and a shell inside the shell. In a scroll compressor having a space and in which the fixed scroll side becomes a high pressure space, a cylindrical part provided on the outer peripheral side of the spiral side plate of the fixed scroll is fitted to the inner diameter surface of the frame to regulate the fixed scroll in the radial direction. and a spring mechanism for pressing the fixed scroll toward the swinging scroll.

[For production]

In this invention, even if liquid compression occurs in the compression chamber formed by the combination of the spiral side plates of the fixed scroll and the oscillating scroll during sleep startup or liquid hacking, the fixed scroll can be relieved by moving in the axial direction against the spring force of the spring mechanism.

In addition, since the height of the cylindrical part and the spiral side plate are the same, the gas load force acting from the compression chamber and the reaction force acting on the frame and cylindrical part are the same in the vertical axis direction, so no moment is generated during steady operation. It can also be operated stably.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows a sectional view of essential parts of a scroll compressor according to the present invention, and FIG. 2 shows a perspective view of a fixed scroll.
5 is a fixed scroll, which includes a base plate 35a and a spiral side plate 3.
5b and a boss-shaped cylindrical portion 35c provided on the outer peripheral side of the side plate 35b and having the same height as the side plate 35b. 40 is a discharge space formed together with the base plate 35a of the fixed scroll and the third shell 3; 36 is a frame that houses the swinging scroll 7 and has an inner diameter surface 36a into which the cylindrical portion 35c of the fixed scroll 35 is fitted; It is. Reference numeral 36b denotes an outer circumferential surface that is fixed to the second shell 2 on the outer circumferential side of the frame 36 by shrink fitting or the like, and by coming into close contact with the second shell 2 on the entire circumference, the frame 36 is fixed and the inner shell space is connected to the discharge space 40. and a lower low pressure space 43. 37 is a base plate 35a of the fixed scroll 35
A bolt 38 fixed to the frame 36 through a bolt insertion hole 41 formed in the frame 36 is a spring member stretched between the bolt head and the frame 36, and urges the fixed scroll 35 toward the swinging scroll 7.

Further, the pressing force by the spring member 38 is applied in the axial direction by the discharge gas pressure from the opposite plate side of the fixed scroll 35a after the scroll compressor is started.
It is sufficient that the axial gas force is set to be larger than the axial gas force due to normal compression by the gas at the time of startup, and thereby the vertical movement of the fixed scroll 35 at the time of startup can be suppressed. 39 is a pin for stopping the rotation of the fixed scroll 35, and is fixed to the frame 36 through a pin hole 42. Note that the other parts are the same as those of the conventional example shown in FIG. 4, so the same reference numerals are given and the explanation will be omitted.

In the scroll compressor configured as described above, when liquid compression occurs in the compression chamber 10 due to sleep startup or liquid hack operation and the internal pressure suddenly and sharply increases, the fixed scroll 35 uses the cylindrical portion 3'5c as a guide. , and the spring member 38 is compressed and moved in the axial direction to relieve the internal pressure of the compression chamber 10 and prevent abnormal pressure rise. Further, since the cylindrical portion 35c is at the same height as the spiral side plate 35b of the fixed scroll and is fitted into the inner diameter surface 36a of the frame 36, the gas load F9 generated due to compression and the frame 36, as shown in FIG. The reaction forces F from 36 are the same in the axial direction, so that during steady operation, the fixed scroll 35 does not move up or down in the axial direction, nor does it become strained. In addition, after the scroll compressor is started, the fixed scroll 35 has its base plate 35a pressed in the axial direction by the discharge pressure, so the relief function can be achieved with a simple configuration of simply pressing the fixed scroll in the axial direction by the spring member 38. can.

[Effects of the Invention] As explained above, according to the present invention, the cylindrical portion provided on the outer peripheral side of the spiral side plate of the fixed scroll is fitted into the inner diameter surface of the frame, and the regulating means for regulating the fixed scroll in the radial direction is provided. , is equipped with a spring mechanism that pushes the fixed scroll toward the oscillating scroll side, so even if liquid compression occurs due to liquid hacking or sleep startup during operation of the scroll compressor, and the pressure in the compression chamber increases symbolically, there is no pressure relief. As a result, abnormal pressure rise is suppressed, resulting in a scroll compressor with high reliability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts of a scroll compressor according to an embodiment of the present invention, Fig. 2 is a perspective view of a fixed scroll, Fig. 3 is a load action diagram of a compression chamber, and Fig. 4 is a conventional scroll compressor. FIG. 2... Second shell, 3... Third shell, 4... Main shaft, 7... Oscillating scroll, 10... Compression chamber, 35
... Fixed scroll, 35a... Base plate, 35b...
- Spiral side plate, 35c... Cylindrical part, 36... Frame, 36a... Inner diameter surface, 38... Spring member, 39...
・Pin, 40...Discharge space. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Fig. 35C: Cylindrical section Fig. 2 Fig. 3 May date

Claims (1)

[Claims] Combine the spiral side plates provided on the base plate with each other,
A fixed scroll and an oscillating scroll that form a compression chamber between both spiral side plates, a frame that accommodates the oscillating scroll and has a cylindrical outer circumference, a main shaft that rotationally drives the oscillating scroll, a fixed scroll, In a scroll compressor, which has a shell that fixes the oscillating scroll to the outer periphery of the frame and seals it therein, and a shell inner space, with the fixed scroll side serving as a high-pressure space, the cylindrical portion provided on the outer periphery side of the spiral side plate of the fixed scroll is A scroll compressor comprising: a regulating means that fits into the inner diameter surface of a frame and regulates the fixed scroll in the radial direction; and a spring mechanism that presses the fixed scroll toward the oscillating scroll.