JPS59206686A - Rotary compressor - Google Patents

Abstract

PURPOSE:To return a liquid refrigerant into a casing ao sa to cool a compressor, by cooling high pressure gas in the enclosed casing to be partly liquefied by a heat radiating part provided in an upper part of the casing and dripping downward this liquefied gas by its dead weight so as to generate a flow of the refrigerant. CONSTITUTION:Two opening parts 12, 13 are provided on wall surfaces positioned upper than a level of lubricating oil in an enclosed casing 1, both communicating these two opening parts 12, 13 by a communication pipe 14 located in the upper position from said opening parts and providing a tilt part 15, sloped toward either one of the opening part 12 or 13, on the half way of this communication pipe 14. A refrigerant, dripping in the tilt part 15 and into the enclosed casing 1 by its dead weight, causes a flow of the refrigerant to be continuously generated in the communication pipe 14, and the liquid refrigerant flowing ino the casing 1 enables a compressor to be surely cooled, resulting in the improvement of efficiency and reliability. Further the refrigerant providing no pulsation of pressure in the enclosed casing 1 is utilized, never causing vibration, while no use of a loop pipe of enclosed type can facilitate assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in a refrigeration cycle, etc., and in particular relates to the cooling system of the compressor. This will be explained with a diagram. Reference numeral 1 denotes a hermetically sealed casing, in which a compression mechanism section 2 is housed. 3 is a suction pipe, and 14 is a discharge pipe.
is open into the closed casing 1. 5 is the fin part 6
A cooling pipe having one end directly communicating with the discharge hole (not shown) of the compression mechanism section 2, and the other end communicating directly with the discharge hole (not shown) of the compression mechanism section 2.
It is open to the public.

Therefore, the refrigerant gas flowing from the G freezing cycle (not shown) through the suction pipe 3 is compressed in the compression mechanism section 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 5. Then, the refrigerant gas reaches the fin portion 5a, where it is cooled and broken down by the heat dissipation effect of the fins.
It reaches the inside and is discharged from the discharge pipe 4 into the refrigeration cycle.

In the conventional configuration described above, since all of the refrigerant gas compressed by the compression mechanism section 2 is directly discharged into the cooling pipe 5, resonance occurs in the cooling pipe 6 due to the pulsation of the discharged gas, resulting in a problem of large vibrations. was there.

Finally, Figure 2 shows the Aririshiba Saitake Mushroom Castle. Incidentally, parts that are the same as those in the conventional example shown in FIG. 6 is an annular sealed tube that forms a closed circuit, and
Is there refrigerant inside the sealed tube 6? [There are people. This sealed tube 6 includes a heat receiving part 8 which is partially or completely submerged in the lubricating oil 7 inside the sealed case song 1, a heat radiating part 9 located outside the sealed case song 1 at a higher position than the heat receiving part 8, and a riser pipe 10. 11. The heat receiving section 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. 1, the refrigerant gas compressed by the compression mechanism section 2 is discharged into the closed casing 1 from the discharge hole (not shown) as shown by the arrow. When the refrigerant gas and lubricating oil T in the sealed casing 1 reach a high temperature during operation of the compressor while being discharged from the discharge pipe 4 to a refrigeration system (not shown), the heat receiving part 8 of the sealed pipe 6
is heated, and the personal liquid refrigerant that had accumulated in the heat receiving section 8 during the stop is vaporized and flows out to the riser pipe 10 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 10.
gradually begins to liquefy. Therefore, the liquid refrigerant begins to drip due to its own weight and returns to the heat receiving section 8 via the riser pipe 11. This cycle is repeated in sequence as shown by the chain arrow in Figure 2.
When the liquid refrigerant is vaporized in the heat receiving part 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 became complicated because it required a separate airtight outlet.

Purpose of the Invention The present invention provides a method for directly utilizing high-temperature gas in a sealed casing.
The compressor is cooled by cooling the liquid refrigerant in the heat dissipation section installed at the top of the hermetic casing, converting it into a portion, and letting it drip downward under its own weight to create a flow of refrigerant, and returning the liquid refrigerant into the hermetic casing to cool the compressor. 0 Structure of the Invention In order to achieve this object, two openings are provided in the wall of the sealed casing above the level of lubricating oil in the sealed casing, and The openings are communicated by a communication pipe located above the openings, and a slanted part is provided in a part of the communication pipe so that one of the two openings is inclined toward the other, thereby creating a unidirectional flow of liquid refrigerant. Cooling is achieved by dripping liquefied refrigerant into the sealed casing at the inclined portion.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
Parts that are the same as those of the conventional product are given the same reference numerals and explanations will be omitted. 1
2.13 is an inlet opening and an outlet opening provided on the wall surface of the sealed casing 1, and an inlet opening 12 and an outlet opening 13 are provided above the oil level of the lubricating oil 7, respectively. , are communicated with each other through a communication pipe 14 disposed above the compressor 1. 15 is an inclined portion formed at the top of the communication pipe 14, and the inlet opening 12. An outlet opening 13 and a respective riser A16. It is connected via the riser 9 pipe B17.

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, high-pressure refrigerant gas, but a portion of the refrigerant liquefies due to the heat dissipation action of the communication pipe 14. In particular, when the refrigerant liquefies at the inclined part 15, the liquid refrigerant starts to drip down the inclined part 16 due to its own weight, and the riser pipe 17,
It leads into the closed casing 1 via the outlet opening 13 . Due to this dripping of the liquid refrigerant, the pressure in the communication pipe 14 near the inclined part 15 decreases, and the high temperature refrigerant gas in the sealed goose song 1
Between entrances [1 part 12. Remove the riser pipe 16 and open the inclined portion 15.
is supplemented with light. Therefore, in the communication pipe 14, between the inlets (]
The flow of high-temperature cold gas toward the inclined part 16 via the riser pipe A16 and the partially liquefied refrigerant in the inclined part 15 flow into the riser WE17. A continuous flow into the closed goose song 1 via the outlet opening 13 occurs as indicated by the arrows in FIG. As a result, liquid refrigerant is always supplied inside the sealed casing, and this liquid refrigerant
When it comes into contact with the high temperature part in the sealed casing 1 and vaporizes, it removes heat and cools the compressor.

In the inventor's experiments, 10) In the case of a compressor of about OW.

By setting the total length of the communication pipe 14 to about 2 m, this has the effect of lowering the temperature of the closed caning 1 of the compressor by about 16 to 18 degrees. If the liquefaction of the refrigerant is promoted too much in the riser pipe A16, the flow of the refrigerant will be obstructed, so the riser pipe A16 may be insulated.

Therefore, since the I/-1 refrigerant gas that is once discharged into the sealed casing 1 and has no pulsation flows through the communication pipe 14, the communication pipe 14
The refrigerant flowing through the communication pipe 14 uses a part of the refrigerant of the refrigeration cycle, so the amount of 4M gas can be optimized as in the case of using a sealed pipe. There's no need.

Effects of the Invention As is clear from the above explanation, the present invention provides a method for applying two or more oils to the wall of the sealed case above the level of lubricating oil in the sealed case/under.
Two openings are provided, and these two openings are communicated by a communication pipe located above the opening, and an inclined part that slopes toward one of the two openings is provided in the middle of this communication pipe. The refrigerant liquefied on the slope generates a continuous flow of refrigerant inside due to its own weight, and the liquid refrigerant flowing into the sealed casing reliably cools the compressor. By using the refrigerant in a sealed casing without pressure pulsations, it is possible to operate quietly without causing the oscillations that occur in conventional systems, and because it is not a sealed loop pipe, it is easy to assemble. cool the compressor to
The efficiency and reliability can be improved.

[Brief explanation of the drawing]

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

Claims (2)

[Claims] (1) A rotary compressor equipped with a compression mechanism, a sealed casing that houses lubricating oil, etc., and a communication tube that carries the sealed casing, opens at both ends above the lubricating oil surface, and extends upward. Machine. (2) The rotary compressor according to claim 1, further comprising an inclined portion at the upper end of the communication section.