JPS59229073A - Rotary compressor - Google Patents

Abstract

PURPOSE:To cool a compressor so as to improve its efficiency and reliability, by liquefying a part of gas through a heat radiating part provided in the upper part outside an enclosed casing and returning a liquefied refrigerant into the enclosed casing. CONSTITUTION:If a refrigerant is liquefied by radiating its heat in a tilted part 15, the liquefied refrigerant starts to drip by dead weight and reach into an enclosed casing 1. This drip causes the titled part 15 to be supplemented with high temperature refrigerant gas in the enclosed casing 1. A flow of the high temperature refrigerant gas towards the tilted part 15 and a flow of the refrigerant, a part of which is liquefied in the tilted part 15, toward the inside of the enclosed casing 1 are continuously generated in a communication pipe 14. As this result, a compressor is cooled by continually supplying the liquefied refrigerant and removing heat when it comes into contact with a high temperature part in the enclosed casing 1 to be evaporated.

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 system for the compressor.

Conventional configuration and its problems The conventional configuration will be explained with reference to FIG. Reference numeral 1 denotes a hermetic casing, and a compression mechanism section 2 is housed inside the casing. 3
4 is a suction pipe, and 4 is a discharge pipe. The suction pipe 3 directly communicates with the compression mechanism section 2 through the sealed casing 1, and the discharge pipe
is open into the closed casing 1. 6 is the fin part 6
It is a cooling pipe having a diameter of 1.a, one end of which directly communicates with a discharge hole (not shown) of the compression mechanism section 2, and the other end of which is open to the closed casing 1.

The refrigerant gas flowing from the refrigeration cycle (not shown) through the suction pipe 3 is compressed in the compression mechanism 2 as shown by the arrow in the figure, and becomes a high-temperature, high-pressure gas that is directly discharged into the cooling pipe 6. . Then, the refrigerant gas reaches the fin portion 5a, where it is cooled by the heat dissipation effect of the fins, and then the airtight casing 1
It is discharged from the discharge pipe 4 into the refrigeration cycle.

In the above conventional configuration, all of the refrigerant gas compressed by the compression mechanism section 2 is directly discharged into the cooling pipe 6, so resonance of the cooling pipe 6 occurs due to the pulsation of the discharged gas, resulting in large vibrations. There was a problem.

Next, another conventional configuration is shown in FIG. Incidentally, parts that are the same as those in the conventional example shown in FIG. Reference numeral 6 denotes an annular sealed tube that forms a closed circuit, and a refrigerant is sealed in the sealed tube e. This sealed tube 6 has a heat receiving part 8 which is partially or completely submerged in the lubricating oil 7 inside the sealed casing 1, and a heat receiving part 8 which is outside the sealed casing 1.
It is composed of a heat dissipation section 9 and a riser pipe 10.11 located at a higher position. The heat receiving part 8 has a loop shape, the loop inlet pipe 8a is located above the loop outlet pipe 8b, and each is fixed to the closed casing 1.

In this configuration, similar to the conventional example shown in FIG.
Thereafter, when the refrigerant gas and lubricating oil 7 in the sealed casing 1 become high temperature while the compressor is operating, the heat receiving part of the sealed pipe 6 8 is heated, and the sealed liquid refrigerant that had accumulated in the heat receiving part 8 when stopped is vaporized and flows out to the riser 10 section outside the closed casing 1 via the loop outlet pipe 8b. The gas refrigerant is gradually cooled while reaching the heat radiation part 9 from the riser pipe 1o, and gradually begins to liquefy in the heat radiation part 9. Therefore, the liquid refrigerant begins to drip due to its own weight and returns to the heat radiating section via the riser pipe 11.

This cycle is repeated in sequence as shown by the chain line arrows in FIG. 2, and as the liquid refrigerant vaporizes in the heat receiving section 8, the lubricating oil and high pressure gas in the sealed casing 1 are cooled.

In the above configuration, if the amount of refrigerant sealed in the sealed tube 6 is small, the amount of refrigerant supplied to the heat receiving section will be interrupted and cooling will be insufficient, so the amount of refrigerant sealed will be adjusted to an appropriate amount for the length of the sealed tube 6. The problem was that the configuration of the compressor was complicated because it required a separate sealed circuit.

Purpose of the Invention The object of the present invention is to directly utilize the high-temperature gas inside the hermetically sealed casing, cool this gas with a heat radiation section provided at the top outside the hermetically sealed casing, partially liquefy it, and then push it downward under its own weight. The objective is to create a flow of refrigerant by dripping, and cool the compressor by returning the liquid refrigerant into the sealed casing, thereby improving efficiency and reliability.

Structure of the Invention In order to achieve this object, two openings are provided in the wall of the sealed casing above the lubricating oil level in the sealed casing, and these two openings are positioned above the opening. A part of the communicating pipe is provided with an inclined part that slopes toward one of the two openings, and the part of the communicating pipe extending from the opening to the top of the inclined part is insulated. This reduces the degree of cooling of the gas in the insulated communication pipe, suppresses liquefaction, creates a smooth flow of refrigerant in one direction, and allows the liquefied refrigerant to drip into the sealed casing at the slope for cooling. It is.

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

Reference numerals 12 and 13 designate an inlet opening and an outlet opening provided on the wall surface of the sealed casing 1, and each is provided at a position above the oil level of the lubricating oil 7. The inlet opening 12 and the outlet opening 13 communicate with each other through a communication pipe 14 disposed above the compressor 1. 16 is an inclined portion formed at the top of the communication pipe 14, and includes an inlet opening 12. It communicates with the outlet opening 13 via a riser pipe A16 and a riser pipe B17, respectively.

18 is a heat insulating material, which insulates the riser pipe A16.

In the above configuration, during operation of the compressor, the closed casing 1
The inside of the communication pipe 14 is filled with high-temperature and high-pressure refrigerant gas, but when the heat is radiated particularly at the inclined portion 16 and the refrigerant liquefies,
The liquid refrigerant begins to drip down the slope 15 due to its own weight, and rises to the riser pipe B17. It reaches the inside of the sealed casing 1 via the outlet opening part 13. This dripping of liquid refrigerant lowers the pressure in the communication pipe 14 near the inclined portion 15, and the high temperature refrigerant gas in the sealed casing 1 is replenished into the inclined portion 16 via the riser pipe A16 of the inlet opening 12. Furthermore, since the riser pipe 16 is insulated, the degree of cooling of the gas in the riser pipe A16 is suppressed, and the refrigerant becomes a completely gaseous refrigerant, and the liquid refrigerant flows into the sealed casing 1 through the inlet opening 12. No backflow and dripping.

Therefore, within the communicating tube 14, the inlet opening 12. The flow of high-temperature refrigerant gas toward the inclined portion 15 via the riser pipe A16 and the refrigerant partially liquefied at the inclined portion 15 flow into the riser pipe B17.
．． A flow toward the inside of the tongue 1 collapse caning 1 via the protrusion opening portion 13 occurs continuously as shown by the arrow in FIG. 3. As a result, liquid refrigerant is always supplied into the hermetic casing 1, and when this liquid refrigerant comes into contact with a high temperature part within the hermetic casing 1 and vaporizes, it removes heat and is cooled by the compressor force. In the inventor's experiment, in the case of a C compressor of about 1ooW, the total length of the communication pipe 14 is about 2m, the vertical pipe A1e is not insulated, and the temperature of the closed casing 1 of the compressor is about 1.
When the riser pipe A16 is insulated, the stiffness of the sealed casing 1 is reduced by about 20 to 23 degrees.

Effects of the Invention As is clear from the above explanation, the present invention provides a method of applying two or more layers to the wall surface of the hermetic casing above the lubricating oil level in the hermetic casing.
providing two openings, communicating the two openings through a communication pipe located above the opening, and providing a part of the communication pipe with an inclined part that slopes toward one of the two openings, This is an insulated riser pipe that communicates between the opening provided in the wall of the sealed casing and the top of the sloped part, and the refrigerant liquefied at the slope drips into the sealed casing due to its own weight, causing the refrigerant to flow into the communicating pipe. This system generates continuous unidirectional flow and reliably cools the compressor with the liquid refrigerant flowing into the sealed casing.As it utilizes the refrigerant inside the sealed casing without pressure pulsations, there is no vibration like in the past. Since the compressor is not a closed loop pipe, it is easy to assemble, and the efficiency and reliability of the compressor can be easily improved.

Furthermore, because one side of the riser pipe is insulated, the liquefaction of the refrigerant in this pipe is prevented, and the flow of refrigerant against the flow of gaseous refrigerant does not occur, allowing for smooth refrigerant circulation, thereby increasing its cooling effect. can be improved.

[Brief explanation of the drawing]

FIGS. 1 and 2 are side views showing a cross-section of a main part of a conventional rotary compressor, respectively, and FIG. 3 is a side view of a cross-section of a main part of a rotary compressor showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Sealed casing, 2... Compression mechanism part, 14... Communication pipe, 15... Inclined part, 18... Heat insulation material . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 484-

Claims (1)

[Claims] A closed casing that houses a compression mechanism, lubricating oil, etc. and is filled with high-temperature, high-pressure gas; and a closed casing that penetrates the sealed casing, opens at both ends above the lubricating oil level, extends upward, and is inclined. A rotary compressor comprising: a communicating pipe having an upper end portion thereof; and a heat insulating material disposed on the outer periphery of the communicating pipe extending from the closed casing to the top of the inclined portion.