JPS6073084A - Cooling device in rotary type compressor - Google Patents

Abstract

PURPOSE:To aim at enhancing the heat radiating effect of a communication pipe, by arranging a refrigerant pump in the raised section of the coolant gas inlet side of the communication pipe so that the refrigerant pump is driven when the temperature of a closed casing becomes higher than a predetermined temperature so that the circulating amount of coolant gas in the communication pipe is increased. CONSTITUTION:A refrigerant circulating pump is disposed in a raised pipe section 10 of a communication pipe having both inlet and outlet ports opened above the level of lubricating oil in a closed casing 1 and extending upward. When the compressor section 2 is driven, high pressure and high temperature gas is discharged into the closed casing 1, and a large part of the gas is discharged into a refrigerating cycle system through a discharge pipe 5. Further, when the temperature of the closed casing 1 exceeds a predetermined value, a temperature detector 13 establishes its circuit to drive a refrigerant circulating pump 12. With this arrangement the circulating amount of refrigerant in the communication pipe 8 is greatly increased to increase heat radiation from the communication pipe 8 so that the compressor section 2 may be efficiently cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in a refrigeration cycle or the like, and particularly to a cooling device for the compressor.

Conventional configuration and its problems The conventional configuration will be explained with reference to FIG. Reference numeral 1 denotes a sealed casing, which houses a compression mechanism section 2, lubricating oil 3, and the like. 4 is a suction pipe, and 5 is a discharge pipe. The suction pipe 4 directly communicates with the compression mechanism section through the closed casing 1, and the discharge pipe 5 is still open into the closed casing 1. 6,
Reference numeral 7 denotes an inlet opening and an outlet opening provided on the wall surface of the sealed casing 1, each of which is provided at a position above the oil level of the lubricating oil 3. The inlet opening 6 and the outlet opening 7 communicate with each other through a communication pipe 8 disposed above the sealed casing 1. Reference numeral 9 denotes a part 1 formed at the top of the communication pipe 80 and descending to the outlet opening 7 side, which connects the inlet opening 6 and the outlet opening 7 through the riser pipe A10 and the riser pipe B11, respectively. It's communicating.

While the compressor is in operation, refrigerant gas flowing from a refrigeration cycle (not shown) through the suction pipe 4 is compressed in the compression mechanism 2 as shown by the arrow in the figure, and becomes a high-temperature, high-pressure gas. It is discharged into the sealed casing 1. Most of the high-temperature, high-pressure refrigerant in the sealed casing 1 is discharged into the refrigeration cycle through the discharge pipe 5, but a portion fills the communication pipe 8 and is liquefied by the heat dissipation action of the communication pipe 8. Especially the slope part 9
When the refrigerant liquefies, the liquid refrigerant begins to drip down the slope part 9 due to its own weight, and reaches the inside of the closed casing 1 via the riser pipe 11 and the outlet opening part. Due to this dripping of the liquid refrigerant, the pressure in the communication pipe 8 near the inclined part 9 decreases, and the high temperature refrigerant gas in the sealed casing 1 flows through the inlet opening 6 and the riser pipe 10 to the inclined part 9. will be replenished. Therefore, in the communication pipe 8, the flow of high-temperature refrigerant gas toward the inclined part 9 via the inlet opening 6 and the riser pipe A1o, and the refrigerant partially liquefied in the inclined part 9, flow through the riser pipe B11 and the outlet opening. The flow toward the inside of the closed casing 1 through the portion 7 occurs continuously as shown by the arrows in FIG.

As a result, liquid refrigerant is always supplied into the hermetic casing, and when this liquid refrigerant comes into contact with the high temperature part within the hermetic casing 1 and vaporizes, it removes heat and cools the compressor.

In the above configuration, in order to obtain a sufficient cooling effect of the compressor, it is necessary to increase the length of the communication pipe 8.

However, along with this, the length of the riser pipe A10 also increases,
As a result, the high-temperature refrigerant gas flowing into the riser pipe A10 from the opening 6 is condensed and liquefied by the heat dissipation effect of the riser pipe A10 at the end leading to the inclined part 9, and then flows into the riser pipe 1o under its own weight. If there is no backflow dripping toward the opening 6, there is a problem in that the flow meter of the refrigerant gas that is about to flow into the communication pipe 8 is reduced, and the effect of increasing the length of the communication pipe 8 cannot be obtained. Ta.

OBJECTS OF THE INVENTION An object of the present invention is to increase the circulation of refrigerant gas within the communication pipe and improve the heat dissipation effect of the communication pipe without increasing the length of the communication pipe.

Structure of the Invention In order to achieve this object, the present invention installs a refrigerant pump at the rising part of the refrigerant gas inlet side of the communication pipe, and when the temperature of the sealed casing becomes higher than a predetermined temperature, the refrigerant pump is operated and the inside of the communication pipe is heated. This increases the amount of refrigerant gas circulated and improves the heat dissipation effect of the communication pipe.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. still,
The same parts as those in the conventional example are given the same numbers and the explanation will be omitted.

Reference numeral 12 denotes a refrigerant circulation pump, which is installed in a vertical pipe A10 that communicates with the inlet opening 6 of the communication pipe 8.

Reference numeral 13 denotes a temperature sensor, which is installed on the closed casing 1 for heat exchange. The electric circuit connects a refrigerant circulation pump 12 and a temperature detector 13 in series, and is connected to a power source 14.

In the above configuration, when the compressor is operated, high-temperature, high-pressure gas is discharged into the sealed casing 1, and most of the gas is discharged from the discharge pipe 5 into a freezing cycle (not shown). Then, the temperature of the sealed cage 1 reaches a predetermined temperature (for example, 70'
C) When the temperature becomes higher than that, the temperature sensor 13 closes, the refrigerant circulation pump 12 starts operating, and the refrigerant circulation in the communication v8 starts.
The amount will be significantly increased compared to before. Therefore, the communication pipe 8
The heat dissipation effect is greatly increased compared to the conventional case, and the temperature of the sealed casing 1 is reduced. When the temperature drops to a predetermined temperature (60° C. in the present invention), the temperature detector 13 opens and the refrigerant circulation pump 12 stops. By repeating the above operations, the temperature of the sealed casing 1 is kept from exceeding a predetermined temperature.

Effects of the Invention As is clear from the above explanation, the present invention provides a riser pipe of a communicating pipe that is open at both ends, which become an inlet and an outlet on three sides, from the lubricating oil level in a sealed casing and extends in three directions. ,
A refrigerant circulation pump is provided, and when the temperature of the sealed casing reaches a predetermined temperature or higher according to a temperature sensor, the refrigerant circulation pump is operated.The amount of refrigerant circulated in the communication pipe can be greatly increased, and the amount of refrigerant in the communication pipe can be increased. The amount of heat dissipated increases and the compressor can be efficiently cooled.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional rotary compressor, and FIG. 2 is a sectional view of a cooling device for a rotary compressor showing an embodiment of the present invention. 1... Sealed casing, 2... Compression mechanism section, 3... Lubricating oil, 12... Refrigerant circulation pump, 13... Temperature detection vessel.

Claims (1)

[Claims] A hermetically sealed casing housing a compression mechanism, lubricating oil, etc., and a riser pipe that penetrates the hermetically sealed casing and is open at both ends serving as an inlet and an outlet above the lubricating oil surface and extends upward, and is provided on one side of the riser pipe. A cooling device for a rotary compressor, comprising a refrigerant circulation pump and a temperature detector that operates the refrigerant circulation pump at a predetermined temperature or higher.