JPH0347494A - Scroll compressor - Google Patents

Abstract

PURPOSE:To radiate the heat effectively with a simple constitution by scooping up the lubricant at the inner bottom of a sealed case by a scroll revolution driving means to a space in the upper part of this sealed case, and scattering the lubricant over the external surface of a scroll. CONSTITUTION:When a revolving scroll 4 begins revolution by a motor 3 due to compressing motion, the lubricant at the bottom 2c of a sealed case 2 is fed to different parts by centrifugal pumps 7a, 7b on a rotor shaft 3a, and also a crank chamber 8 is filled with lubricant fed through oil grooves 7c, 7d, and the lubricant in the crank chamber 8 passes an oil supply pipe 9 to be scattered over the external surface 1b of a stationary scroll 1 from an oil supply hole 9a. This is cooled, sent through a penetrative groove 2b, and cooled by the sealed case 2 while creeping on the inner wall of the sealed case 2, to be circulated back to the bottom 2c. This prevents increase in the slide loss and the leak loss of the compressed fluid from compression chamber due to thermal deformation, and a scroll compressor with high performance is obtained.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention relates to scroll compressors used in air conditioners, refrigerators, etc. It is related to.

(Prior Art) Conventionally, in a case-internal low-pressure type scroll compressor, suction gas is used to cool heat-generating parts such as a fixed scroll to prevent thermal expansion and deformation of the parts.

(Problems to be Solved by the Invention) However, when the suction gas is used for cooling, it is possible to cool the necessary portion, but on the other hand, there is a problem that the suction gas itself thermally expands and reduces compression efficiency.

In addition, cooling an in-case high-pressure type scroll compressor with suction gas only complicates the structure, and the problem of thermal expansion of the suction gas and lowering compression efficiency is the same as in the case of the in-case low-pressure type scroll pressure ALFI. Become.

An object of the present invention is to provide a scroll compressor having a cooling function that can be applied to both a low-pressure type and a high-pressure type in a case without using suction gas.

[Archives of the Invention] (Means for Solving the Problems) This invention forms a compression chamber by fitting scroll-shaped wraps provided on each of a pair of end plates, and also makes it possible to In a scroll compressor that is supported in a closed case so as to be able to rotate, lubricating oil stored in the inner bottom of the closed case is pumped up into the upper space inside the closed case by means for driving the scroll to lubricate the outer surface of the scroll. It is characterized by comprising a cooling means for spraying oil.

(Function) With this configuration, the scroll is cooled by the lubricating oil sprinkled on its outer surface, and the lubricating oil that contains heat due to this cooling action flows back along the inner wall of the sealed case, causing the sealed case to close. Heat is radiated and cooled through the

(Example) An example of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of this embodiment, and FIG.
FIG. 2 is a cross-sectional view of a portion shown along line A-A in the figure.

In FIG. 1, a fixed scroll 1 is fixed to a frame 2a, and its wrap 1a is attached to a rotor shaft 3 of a motor 3.
A compression chamber 5 is constituted by a wrap 4a of an orbiting scroll 4 that rotates via a crankshaft 3b connected to a,
This fixed scroll 1 has a suction vibro a that penetrates the sealed case 2 and takes the compressed fluid into the compression chamber 5, and a discharge that discharges the compressed compressed fluid from the outer surface 1b of the fixed scroll 1 into the upper part of the sealed case 2. An outlet 1c is provided on the outer peripheral wall of the fixed scroll 1 and the frame 2a for sending the compressed fluid discharged from the compression chamber 5 to the outside through a discharge vibro b provided on the side of the case 2, and a lubricating oil outlet. A plurality of through grooves 2b are provided for circulating the water along the inner wall of the sealed case 2.

Further, the rotor shaft 3a is provided with centrifugal pumps 7a and 7b, and these centrifugal pumps 7a and 7b cause the bottom part of the sealed case to
The lubricating oil stored in C is transferred to oil groove 7c.

A lubrication path is formed through 7d to the rotor shaft 3a and crankshaft 3b, between the orbiting scroll 4 and the thrust bearing 4b, and between the laps la and 4a of the fixed scroll 1 and the orbiting scroll 4. room 8
An oil supply pipe 9 having a plurality of oil supply ports 9a is attached to the crank chamber 8 to supply the lubricating oil pumped into the crank chamber 8 to the outer surface 1b of the fixed scroll 1, that is, the back surface of the wrap 1a which becomes hot due to the heat of compression. ing.

In the scroll compressor of this embodiment configured in this way, when the motor 3 starts rotating for compression operation, the orbiting scroll 4 also starts an orbiting motion, but at the same time, the rotor shaft 3a
A centrifugal pump 7a provided in the.

7b supplies lubricating oil to each part, and the crank chamber 8 is also filled with lubricating oil through oil grooves 7c and 7d. Furthermore, the lubricating oil in the crank chamber 8 is fed to the oil supply pipe 9 by the oil feeding power of centrifugal pumps 7a and 7b. through the oil filler port 9a and fall onto the surface of the outer surface 1b of the fixed scroll 1.
The lubricating oil spreads around the entire surface of the case and cools the outer surface 1b, and after cooling, the lubricating oil containing heat passes through the through groove 2b and passes through the inner wall of the sealed case 2, and is cooled by the sealed case 2 while cooling the bottom of the sealed case. It is refluxed to 2c to perform a cooling effect.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

For example, in the above embodiment, a centrifugal pump is used as a means for supplying oil to the outer surface of the fixed scroll, but a trochoid gear pump or the like may also be used as an oil supply means to ensure a more sufficient amount of oil supply.

Further, instead of using an oil supply pipe as an oil supply passage to the outer surface of the fixed scroll, a hole for the oil supply passage may be provided in the frame and the fixed scroll.

[Effects of the Invention] According to the present invention, it is possible to efficiently radiate the exhaust heat of the scroll to the outside of the sealed case with a simple configuration,
It is possible to prevent leakage loss of compressed fluid from the compression chamber due to thermal deformation and increase in sliding loss, and a high-performance scroll compressor can be provided.

Further, the scroll compressor according to the present invention can be applied to both an in-case low-pressure type and a high-pressure type.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view of the portion shown in FIG. AA. 1... Fixed scroll 1h... Outer surface 2... Sealed case 2b... Penetration groove 3... Motor 3b... Crankshaft 4a... Wrap 5. ... Compression chamber 6b ... Discharge pipe 9 ... Oil supply pipe 1a ... Wrap IC ... Discharge port 2a ... Frame 2C ... Bottom 3a ... Rotor shaft 4 ...Orbiting scroll 4b...Thrust receiver 6a...Suction pipe 8...Crank chamber 9a...Oil filler port

Claims (1)

[Claims] A scroll compressor in which scroll-shaped wraps provided on each of a pair of end plates are fitted to form a compression chamber, and each scroll is supported in a closed case so as to be able to rotate relative to each other, the closed case as described above. A scroll compressor characterized by comprising a cooling means for pumping up lubricating oil stored in the inner bottom part into a space in an upper part of the closed case by means for driving the rotational movement of the scroll, and dispersing the lubricating oil on the outer surface of the scroll. .