JPH04334790A - Closed compressor - Google Patents

Abstract

PURPOSE:To prevent a compression mechanism from being seized and poor lubrication due to rise in the viscosity of lubricating oil by cooling the compression mechanism and lubricating oil. CONSTITUTION:A compression mechanism 3 is enclosed with an outer casing body 35, at least, whose part is submerged in lubricating oil 17 to form a low temperature gas room 36 around the compression mechanism 3, and low temperature gas which is cooled by a heat exchanger 34 is introduced into the low temperature gas room 36 to cool the compression mechanism 3 and the lubricating oil 17.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor incorporating a rotary compression mechanism and the like.

0002

2. Description of the Related Art An example of a conventional hermetic compressor is shown in FIGS. 2 and 3. A rotary compression mechanism 3 and a motor 2 for driving the rotary compression mechanism 3 are housed inside the sealed casing 1, and lubricating oil 17 is stored at the inner bottom of the sealed casing 1. A stator 2a of the motor 2 is fixed to the closed casing 1, and a rotor 2b is fixed to the upper part of the crankshaft 4 of the rotary compression mechanism 3. The rotary compression mechanism 3 includes a rolling piston 6 fitted to the crank pin 5 of the crankshaft 4, a cylinder block 7 fixed to the sealed casing 1, and an upper end plate 8 that closes the upper end opening of the cylinder block 7. a lower end plate 9 that closes the lower end opening of the cylinder block 7;
The blade 10 is fitted into a slot 24 formed in a slot 24 so as to be retractable, and a pressing spring 11 is disposed behind the blade 10 to push it. A rolling piston 6 is accommodated in a cylinder chamber 12 defined by a cylinder block 7, an upper end plate 8, and a lower end plate 9, and the blade 10 is assembled by abutting the tip of the blade 10 on the outer peripheral surface of the rolling piston 6. A suction chamber 13 is delimited on one side and a compression chamber 14 is delimited on the other side. The crankshaft 4 is supported by an upper end plate 8 and a lower end plate 9, respectively.

When the crankshaft 4 is rotationally driven by the motor 2, the rolling piston 6 moves into the cylinder chamber 1.
2, the gas is sucked into the suction chamber 13 from the suction pipe 20, and the compression chamber 14
The gas inside is compressed. The compressed gas passes through a discharge port 22 formed in the upper end plate 8, pushes up a discharge valve (not shown), and enters a discharge muffler chamber 27 bounded by the upper end plate 8 and the cover 26 covering the upper surface thereof. The pulsating component is removed. Next, it enters the heat exchanger 34 through a flow path 31 and an outflow pipe 32 bored in the upper end plate 8 and the cylinder block 7, and is cooled by dissipating heat there. It flows into the first expansion chamber 28 defined between the rotary compression mechanism 3 and the motor 2, and expands there, thereby removing its pulsating component. Next, after cooling the motor 2 by passing through the air gap between the stator 2a and the rotor 2b and the passage 29 formed between the stator 2a and the hermetic casing 1, the The pulsating component is removed by entering the expansion chamber 15 of No. 2 and expanding there, and then being discharged to the outside through the discharge pipe 16.

The lubricating oil 17 stored in the inner bottom of the sealed casing 1 is pumped up by an oil pump 18 built into the inner lower part of the crankshaft 4, and is transferred to the crankshaft 4 and the upper part through an oil supply passage 19 bored in the crankshaft 4. The sliding surfaces between the end plate 8 and the lower end plate 9, the sliding surfaces between the crank pin 5 and the rolling piston 6, the sliding surfaces between the rolling piston 6 and the cylinder block 7, and the like are supplied with oil.

[0005]

In the conventional hermetic compressor described above, the gas discharged from the rotary compression mechanism 3 is cooled by the heat exchanger 34 and then introduced into the hermetic casing 1 again to cool the motor 2. However, since the rotary compression mechanism 3 and the lubricating oil 17 cannot be cooled sufficiently, there are problems such as seizure of the rotary compression mechanism 3 and poor lubrication due to a decrease in the viscosity of the lubricating oil 17.

[0006]

[Means for Solving the Problems] The present invention was invented to solve the above problems, and its gist is to provide an inner bottom of a sealed casing in which a compression mechanism and a motor for driving the compression mechanism are built-in. After storing lubricating oil in and cooling the gas discharged from the compression mechanism with a heat exchanger,
In the hermetic compressor that is introduced into the hermetic casing again, a low-temperature gas chamber is formed around the compression mechanism by surrounding the compression mechanism with a jacket body at least partially immersed in the lubricating oil; The hermetic compressor is characterized in that gas cooled by the heat exchanger is introduced into the hermetic casing through the low-temperature gas chamber.

[0007]

[Operation] Since the present invention has the above-mentioned configuration, the gas discharged from the compression mechanism is cooled by the heat exchanger, and then flows into the low temperature gas chamber, and in the process of flowing through the gas chamber, the airtight casing is closed. Cools the lubricating oil stored in the inner bottom and the compression mechanism.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal cross-sectional view of a main part of a hermetic compressor showing one embodiment of the present invention. By surrounding the compression mechanism 3 with the jacket 35, a low temperature gas chamber 36 is formed around the compression mechanism 3.
is formed. The lower part of this mantle body 35 is lubricating oil 17
immersed in it. The cold gas chamber 36 communicates with the heat exchanger 34 through an inflow pipe 33 connected to the lower part of the mantle 35 , and the cold gas chamber 36 communicates with the heat exchanger 34 through an outlet 37 formed in the upper part of the mantle 35 . communicates with the first expansion chamber 28. The other configurations are the same as the conventional ones shown in FIGS. 2 and 3, and corresponding members are given the same reference numerals and their explanations will be omitted.

[0009]The gas discharged from the compression mechanism 3 passes through the discharge muffler 27, the flow path 31, and the outflow pipe 32, and enters the heat exchanger 34, where it is cooled and becomes a low-temperature gas. This low-temperature gas is led to the low-temperature gas chamber 36 via the inflow pipe 33, and in the process of flowing through the low-temperature gas chamber 36, it cools the compression mechanism 3 and at the same time cools the lubricating oil 17. 1 into the expansion chamber 28. Next, the motor 2 and the like are cooled while flowing through the sealed casing 1, and then discharged to the outside through the discharge pipe 16.

[0010] Thus, by cooling the compression mechanism 3, the temperature of the gas compressed by the compression mechanism 3 decreases, and its specific volume decreases, resulting in an improvement in volumetric efficiency. In addition, as the compression mechanism 3 cools, the temperature of the lubricating oil 17 that uses this as a heat source also decreases, and the lubricating oil 17 stored in the inner bottom of the sealed casing 1 is cooled and its temperature decreases. It is possible to prevent seizure accidents caused by poor lubrication due to overheating of the lubricating oil 17 or a decrease in the viscosity of the lubricating oil 17. Note that if a baffle plate is attached to the low-temperature gas chamber 36 to prevent the drift of low-temperature gas, the cooling performance can be improved.

[0011]

Effects of the Invention In the present invention, a low-temperature gas chamber is formed around the compression mechanism by surrounding the compression mechanism with a mantle, at least a portion of which is immersed in lubricating oil stored in the inner bottom of the sealed casing. Since the low-temperature gas formed and cooled by the heat exchanger is introduced into the low-temperature gas chamber, the lubricating oil and the compression mechanism can be cooled in the process of flowing through the low-temperature gas chamber. As a result, the temperature of the gas compressed by the compression mechanism decreases, which not only improves volumetric efficiency but also prevents seizure accidents caused by poor lubrication due to overheating of the compression mechanism and decreased viscosity of lubricating oil. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a main part of a hermetic compressor according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional hermetic compressor.

FIG. 3 is a sectional view taken along arrow A-A in FIG. 2;

[Explanation of symbols]

1 Sealed casing 17 Lubricating oil 2 Motor 3 Compression mechanism 34 Heat exchanger 35 Mantle body 36 Low temperature gas chamber

Claims (1)

[Claims] [Claim 1] Lubricating oil is stored in the inner bottom of a sealed casing in which a compression mechanism and a motor that drives the same are built in, and the gas discharged from the compression mechanism is cooled by a heat exchanger, and then the gas is stored inside the sealed casing again. In the hermetic compressor to be introduced into the heat exchanger, a low-temperature gas chamber is formed around the compression mechanism by surrounding the compression mechanism with a jacket body at least partially immersed in the lubricating oil. A hermetic compressor, characterized in that cooled gas is introduced into the hermetic casing through the low-temperature gas chamber.