JPH0219680A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent burning at the bearing sliding section by positioning the central axis of a compression mechanism assembly eccentrically above the central axis of a shell. CONSTITUTION:An oil sump 52 is arranged on the bottom of a shell 51. A compression mechanism assembly 53 comprising a fixed scroll 54 and a rolling scroll 55 combined eccentrically and a stator motor 56 and a motor rotor 57 for driving the rolling scroll 55 is arranged in the shell 51. When the central axis A of the compression mechanism assembly A is positioned vertically above the central axis B of the shell 51, an oil sump 52 having wide space can be formed below the compression mechanism assembly 53. Since sufficient lubricant can be stored in the oil sump 52, the bearing section can be protected from burning due to lowering of viscosity of the lubricant caused by dissolution of refrigerant into the lubricant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll compressor suitable for use in equipment such as refrigerators and air conditioners.

[Conventional technology]

Generally, the operating principle of this type of scroll compressor is shown in Figure 5 (
It can be explained using al~(dl.

That is, the fixed scroll l is fixed at a predetermined position,
In contrast, an oscillating scroll 2 is combined,
It rotates around a fixed point 0 with the radius being the interval 〇-〇'. 00.90', 18 of the oscillating scroll 2 accompanying this
The turning positions at 0° and 270° are as shown in FIG. Further, as the orbiting scroll 2 rotates, the crescent-shaped compression chamber 3 formed between the fixed scroll l and the orbiting scroll 2 gradually reduces its volume toward the discharge port (not shown). , whereby the gas taken into the compression chamber 3 is compressed and discharged from a discharge port (not shown). At this time, it is shown in FIG. The distance between -o' is kept constant and the spiral spacing (corresponds to the spiral pitch)
If a is the thickness and t is the thickness, then 00'-at/2 is obtained.

Next, a conventional scroll compressor will be explained with reference to FIG. 6 (Japanese Patent Application Laid-open No. 59-120796 (disclosure)). In the figure, the reference numeral 11 denotes a fixed scroll, lla and llb are discharge ports and suction ports provided on the center side and outside of the fixed scroll 11, 12 is an oscillating scroll combined with the fixed scroll 11, and 13 14 is a compression chamber formed between both scrolls 11 and 12, and 14 is a bearing support fixed in the shell 15 by means such as press fitting. The fixed scroll 11 is fixed to this bearing support 14 by, for example, bolting. Reference numeral 16 denotes a crankshaft whose large diameter portion 16a is rotatably attached to the bearing support 14. The shaft 12a of the oscillating scroll 12 is eccentrically fitted into the large diameter portion 16a of the crankshaft 16. 17 is an Oldham joint provided between the bearing support 14 and the swinging scroll 12. This Oldham fitting 1
7 is configured such that the swinging scroll 12 does not rotate on its own axis but can slide in the radial direction so as to rotate as the crankshaft 16 rotates. Also, 1
8 is a bearing sliding part of the swinging scroll 12 and the bearing support 14;
Reference numeral 19 denotes a motor stator which is concentrically attached to the shell 15 on one side of the bearing support 14 by means such as press-fitting or bolting, and 20 is a motor stator which is disposed concentrically within the motor stator 19 via an air gap 21 and which is connected to the crankshaft. Motor rotor fixed on 16, 22 and 23
24 is a discharge pipe communicating with the discharge port 11a, and 25 is a suction pipe communicating with the inside of the shell 15. These double door pipes 24, 25 are connected in a gas-tight manner to the shell 15, for example by brazing.

Reference numeral 26 indicates an oil passage formed at the fitting portion between the motor stator 19 and the shell 15 on the oil reservoir 27 side, and 28 has one end passing through the shell 15 and being connected to the suction port 11b, and the other end passing through the motor rotor 20 and the shell 15. This is a communication pipe that passes through the shell 15 and is connected to the suction space 29 opposite to the compression part (scroll side) among the suction spaces formed by the above.

30 is a splasher in which the boss 30a is fixed to the crankshaft 16 at a portion located between the bearing support 14 and the motor rotor 20, for example, by means of a press-fit cylinder, and the lower peripheral portion including the edge 30b is immersed in oil in the oil reservoir 27; 31; is oil sump 2
A splasher 3 is attached to the upper outer periphery of the bearing support 14 on the opposite side to the bearing support 14.
an oil sump pocket formed opposite to the edge 30b of 0;
32 is an oil hole formed in the bearing support 14 and communicates with the bearing sliding part 34 via the oil supply hole 33 of the crankshaft 16; 35 is an oil hole formed in the axial direction of the crankshaft 16 and communicating with the bearing sliding part 34; It is.

This oil hole 35 communicates with a bearing sliding portion 37 via an oil supply hole 36 of the crankshaft 16. Further, 38 is a bearing sliding portion that communicates with the oil hole 32.

In the scroll compressor configured in this manner, when the motor is driven, gas, which is the working fluid, is sucked into the shell 15 from the suction pipe 25 as shown by the solid arrow in FIG. 6, and passes through the air gap 21 of the motor. Suction space 29
The air flows into the compression chamber 13 through the communication pipe 28 and the suction port 11b.

Furthermore, the high-pressure gas compressed as the orbiting scroll 12 rotates is discharged from the discharge pipe 24 through the discharge port 11 to the outside of the compressor. At this time, motor stator 19 and motor rotor 20 are cooled by the suction gas.

On the other hand, oil flows as shown by the dashed arrow in FIG. That is, the rotation of the crankshaft 16 causes the splasher 30 to
As the oil sump 27 rotates, the oil in the oil sump 27 adheres to the splasher 30 and is pulled up and is scattered by centrifugal force, and this oil accumulates in the oil sump pocket 31. The oil in the oil sump pocket 31 flows down inside the oil hole 32 due to gravity, is supplied to the bearing sliding part 18.38, and is also supplied to the oil supply hole 3.
3.36 and the oil hole 35 to the bearing sliding part 34.3.
7.

The oil that has lubricated the sliding parts of each bearing is then released into the suction port 11b or the suction space in the shell 15, carried by the suction gas, and taken into the compression chamber 13 together with the suction gas. At the same time, it is discharged from the discharge pipe 24 to the outside of the compressor, circulates through the oil separator or each refrigeration and air conditioning cycle, and returns into the compressor from the suction pipe 25.

[Problem to be solved by the invention]

By the way, in a conventional scroll compressor, both scrolls 11.12 and motor stator 19. A compression mechanism assembly with a motor rotor 20 is mounted concentrically within the shell 15, so that when the oil level in the oil sump 27 rises, the oil is agitated by the balancers 22, 23 during operation, reducing the load on the compressor. There is a problem in that the amount increases and the performance deteriorates.

Therefore, it is possible to solve the above problem by setting the oil level in the oil reservoir 27 low, but in this case, if a liquid bank phenomenon occurs when the compressor is operating or a refrigerant stagnation phenomenon occurs when the compressor is stopped, The problem was that the oil was diluted by the refrigerant and its viscosity decreased abnormally, causing the sliding parts of the bearing to burn out.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a scroll compressor that can prevent performance degradation due to increased load on the compressor and burnout of bearing sliding parts.

[Means to solve the problem]

A scroll compressor according to the present invention includes a cylindrical shell having an oil reservoir at the bottom and a center axis extending in the horizontal direction, and two scrolls provided inside the shell and assembled eccentrically to each other. and a compression mechanism assembly having a motor for driving one of the two scrolls, the center axis of the compression mechanism assembly being eccentrically positioned vertically above the center axis of the shell.

[For production]

In the present invention, by positioning the central axis of the compression mechanism assembly vertically above the central axis of the shell, it is possible to form an oil reservoir with a wide space below the compression mechanism assembly.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a sectional view showing a scroll compressor according to the present invention,
Figures 2, 3, and 4 are cross-sectional views taken along the lines nn, m-m, and rV-IV in Figure 1, and the same parts as in Figure 6 are With the same symbol,
Detailed explanation will be omitted. In the figure, a shell designated by reference numeral 51 is constituted by a cylindrical body having a central axis extending in the horizontal direction. This shell 51 is provided with an oil reservoir 52 at the bottom that stores oil for lubricating the sliding parts of each bearing, and inside is a compression mechanism assembly 53 that compresses the working fluid.
is provided. This compression mechanism assembly 53 has a central axis A eccentrically positioned vertically above the central axis B of the shell 51, and a fixed scroll 54, an oscillating scroll 55, and Of these two scrolls, the oscillating scroll 5
It is constituted by an assembly having a motor stator 56 and a motor rotor 57 that drive the motor 5. A fixed scroll 54 of this compression mechanism assembly 53 has a bolt hole 54a, a discharge port 54b, a suction port 54c, and a spiral wrap 54d, and is fixed to a bearing support 58. The swinging scroll 55 also includes a shaft 55a, a base plate 55b, and a spiral wrap 55.
c, and is eccentrically combined with the fixed scroll 54. The bearing support 58 is integrally provided with a plurality of protrusions 58a radially arranged in pressure contact with the inner circumferential surface of the shell 51, and each of these protrusions 58a has a bolt hole 5.
8b is provided. Further, the motor stator 56 is radially integrally provided with a plurality of protrusions 56a that press against the inner circumferential surface of the shell 51 similarly to the bearing support 58. These protrusions 56a or the bearing support 58
The projections 58a are formed in different shapes so that the rotation center of the compression mechanism assembly 53 coincides with the rotation center of the motor rotor 57 and is eccentrically vertically upward from the center of the shell 51. Note that in the figure, the symbols 01 and 0□ indicate the center of the shell 51 and the rotation center of the compression mechanism assembly 53, respectively.

In the scroll compressor configured in this manner, by positioning the central axis A of the compression mechanism assembly 53 vertically above the central axis B of the shell 51, an oil sump with a wide space below the compression mechanism assembly 52 is created. 52 can be formed.

Therefore, in the present invention, it is possible to secure a sufficient amount of oil in the oil reservoir 52 to lubricate each bearing sliding portion. Further, even if the oil in the oil reservoir 27 increases during operation, the rise in the oil level can be suppressed.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a cylindrical shell having an oil reservoir at the bottom and a central axis extending in the horizontal direction, and two cylindrical shells provided inside the shell and each assembled eccentrically with respect to the other. a compression mechanism assembly having two scrolls and a motor for driving one of these scrolls, and the central axis of the compression mechanism assembly is eccentrically positioned vertically above the central axis of the shell, so that compression An oil sump with a large space can be formed below the mechanism assembly. Therefore, sufficient oil can be secured in the oil reservoir to lubricate the sliding parts of each bearing, thereby preventing burnout of the sliding parts of the bearings due to a decrease in oil viscosity due to refrigerant infiltration into the oil. be able to. In addition, even if the oil in the oil sump increases, the rise in oil level can be suppressed, so the balancer no longer stirs the oil as in the past, preventing performance deterioration due to increased load on the compressor. You can also do it.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing a scroll compressor according to the present invention;
Figures 2, 3, and 4 are a sectional view taken along the nn line in Figure 1, a sectional view taken along the fir-1111 line, a sectional view taken along the fV-TV line, and Figure 5 (al to fdl indicate the operation of the scroll compressor. FIG. 6, which is a diagram for explaining the principle, is a sectional view showing a conventional scroll compressor. 51 Shell, 52 Oil sump, 53.
... Compression mechanism assembly, 54... Fixed scroll,
55... Rocking scroll, 56... Motor stator, 57... Motor rotor, A, B... Center axis line. 2nd A, B; middle tσ @ winter 3rd figure 5th figure 4th figure 6- figure

Claims (1)

[Claims] A cylindrical shell having an oil reservoir at its bottom and a center axis extending horizontally, two scrolls installed inside this shell and each assembled eccentrically to each other, and one of these scrolls. a compression mechanism assembly having a motor for driving the scroll compressor, the center axis of the compression mechanism assembly being eccentrically positioned vertically above the center axis of the shell.