JPS6056188A - Cooling system for compressor - Google Patents

Abstract

PURPOSE:To improve the radiation efficiency of radiating section thus to improve the radiation capacity of communication tube, by making the diameter of radiating section longer than the diameter of adiabatic section of communication tube while making the communication tube at the radiating section flat. CONSTITUTION:Communication tube 13' is formed with a rising tube A15' for forming the adiabatic section 17', inclined section 14' for forming the radiating section 19' and a rising tube 16'. The inclined section 14' and the rising tube B16' are larger in diameter than the rising tube A15' and made flat. In other word, it has inner cross-section approximately same with that of the rising tube A15' while only the outer surface area is approximately 1.7 times that of the rising tube A15. Aluminum tape 18' is applied on the outer box 2 only at the radiating section to facilitate heat-exchange.

Description

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

Conventional configuration and its problems The configuration of a conventional example will be explained with reference to FIGS. 1 to 3.

1 is a refrigerator main body, which is a heat insulating box body formed by an outer box 2, a heat insulating material 3, and an inner box 4. Reference numeral 5 denotes a rotary compressor, and a compression mechanism section 7, lubricating oil 8, etc. are housed inside a sealed casing 6 filled with high-pressure gas. 9 is the suction pipe,
10 (l'i is a discharge pipe, the suction pipe 9 directly communicates with the compression mechanism section 7 through the closed casing 6, and the discharge pipe 1o is open into the closed casing. 11.12
are an inlet opening and an outlet opening provided on the wall surface of the sealed casing 6, and are provided above the oil level of the lubricating oil 8, respectively. The inlet opening 11 and the outlet opening 12 are connected to a communication pipe 1 disposed above the sealed casing 6.
It is connected by 3. 14 is formed at the top of the communication pipe 13,
This is an inclined portion that descends toward the outlet opening 12 side, and communicates with the inlet opening 11 and the outlet opening 12 via a riser pipe A15 and a riser pipe B1e, respectively. In addition, the communication pipe 13
is located inside the back of the refrigerator body 1, and the riser pipe A
15 is arranged in the heat insulating material 3 to form a heat insulating part 17. The riser pipe B16 of the inclined portion 14 is attached and fixed to the outer case 2 with an aluminum tape 18 so as to be in contact with the outer case 2 in a heat exchange manner, thereby forming a heat dissipation portion 19.

While the compressor 5 is in operation, the refrigerant gas flowing into the refrigeration cycle (not shown) through the suction pipe 9 is compressed in the compression mechanism section 7 as shown by the arrow in the figure, and the refrigerant gas is compressed at high temperature and high pressure. It becomes a gas and is discharged into the sealed casing 6. Most of the high-temperature, high-pressure refrigerant in this sealed casing 6 is in the discharge pipe 1
0 to the refrigeration cycle, but some of it is discharged from the communication pipe 13.
It is condensed and liquefied in the heat dissipation section 19 of the communication pipe 13.

The condensed and liquefied liquid refrigerant drips down the inclined portion 14 and the inside of the riser pipe B16 due to its own weight, and reaches the inside of the sealed casing 6 via the outlet opening 12. Due to this dripping of liquid refrigerant, the inclined part 1
4. The pressure in the riser pipe B16 decreases, and the high temperature refrigerant gas in the sealed casing 6 flows through the inlet opening 11 and the riser pipe A1.
6, the heat dissipating portion 19 consisting of the inclined portion 14 and the riser pipe B16 is replenished. Therefore, in the communication pipe 13, the flow of high-speed refrigerant gas toward the inclined part 14 via the inlet opening 11 and the riser pipe A15, and the refrigerant partially liquefied in the inclined part 14, flow through the riser pipe B16 and the outlet opening. 12 into the closed casing e will occur continuously as shown by the arrows in FIG.

At this time, the riser pipe A1ts is insulated by the heat insulating material 3, and the refrigerant will not condense and liquefy in the riser pipe A15 of the heat insulating section 17, and therefore the liquid refrigerant will not flow back in the riser pipe A16. . As a result, liquid refrigerant is always supplied into the hermetic casing 6, and when this liquid refrigerant comes into contact with a high temperature part within the hermetic casing 6 and vaporizes, it removes heat and cools the compressor 5.

In the above configuration, in order to obtain a sufficient cooling effect of the compressor 5, it is necessary to increase the diameter of the communication pipe 13 in order to increase the heat dissipation effect of the communication pipe 13.

However, along with this, the diameter of the riser pipe A15 has also increased,
As a result, the high temperature refrigerant gas flowing into the riser pipe A15 from the inlet part 11 reaches the riser pipe A15 by the time it reaches the inclined part 14.
It condenses and liquefies due to the heat dissipation effect of the riser pipe A15 due to its own weight.
The inside will drip backwards towards the inlet opening 11,
When the refrigerant gas tries to flow into the communication pipe 13, the flow rate of the refrigerant gas is reduced, and the effect of making the communication pipe 13 thicker cannot be obtained.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to enhance the heat radiating effect of the heat radiating section without increasing the length of the communicating tube and the internal cross-sectional area of the tube, thereby improving the heat radiating ability of the communicating tube.

Structure of the Invention In order to achieve this object, the present invention makes the diameter of the heat radiating part larger than the diameter of the heat insulating part of the communicating pipe, and makes the communicating pipe of the heat radiating part into a flat tube shape. The outer surface area of the heat dissipation part is increased without increasing the cross-sectional area of the heat dissipation part, the heat dissipation effect of the heat dissipation part is enhanced, and the heat dissipation ability of the communication pipe is improved.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 and 6. Incidentally, the same parts as those in the conventional example are given the same numbers and the explanation is omitted.

The communication pipe 13' includes a riser pipe A1 forming a heat insulating section 17'.
5', an inclined part 14' forming a heat radiation part 19', and a riser pipe B16'.

The diameter of the riser pipe A16' is, for example, an outer diameter of 4.76 m++.
+ The plate thickness is 0.5 Wm, and forms a heat dissipation section 19'.

On the other hand, the pipe diameter of the inclined part 14' and the riser pipe B16' is larger than that of the riser pipe A15', for example, an outer diameter of 7.94 mm and a plate thickness of 0.6 mm, and the pipe shape is a flat shape with a short diameter of 2.8 rMl. I have to. In other words, the internal cross-sectional area of the riser pipe is A16.
', and only the outer surface area is approximately 1.7 of that of riser pipe A15'.
I'm trying to make it double in size. And only the heat dissipation part,
It is attached to the outer box 2 with aluminum tape 18' and fixed for heat exchange.

In the above configuration, when the compressor is operated as in the conventional example, high temperature and high pressure refrigerant gas is discharged into the sealed casing 6, and most of it is discharged from the discharge pipe 1o to the refrigeration cycle (not shown). . In addition, the inclined portion 14', the riser pipe B1
By dripping the condensed and liquefied refrigerant at the heat radiation part 19' consisting of 6', the artificial opening 11, the riser pipe A16', the inclined part 14',
A flow of refrigerant takes place via the riser 16' and the outlet opening 12 back into the closed casing 6. At this time, the communication pipe 13
The amount of refrigerant circulation flowing through the inclined portion 14' is increased.

It is proportional to the heat dissipation capacity of the heat dissipation section 19' consisting of the riser pipe B16'. Therefore, the tube shape of the heat dissipation part 19' is made flat, the tube internal cross-sectional area is the same, and only the tube external surface area is 10% compared to the conventional one.
．． Since it is seven times as large, the heat dissipation capacity of the heat dissipation section 19' is also improved, and as a result, the flow of refrigerant in the communication pipe 13' is promoted, and the compressor 6 can be efficiently cooled.

Effects of the Invention As is clear from the above description, the present invention provides a structure in which the riser pipe A of the communicating pipe, which is open at both ends and extends upward above the lubricating oil level in the sealed casing, is shaped into a round pipe. , the inclined portion and the riser pipe B have a flat tube shape, and the inner cross-sectional area of the inclined riser pipe B is equal to or greater than the inner cross-sectional area of the riser pipe A; It is possible to increase the heat radiation effect per unit length in the heat radiation section, which increases the heat radiation capacity even with the same heat radiation section length, promotes the flow of refrigerant in the communication pipe, and efficiently cools the compressor. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cooling device in a conventional refrigerator;
FIG. 2 is a sectional view taken along line nn' in FIG. 1, FIG. 3 is a sectional view showing a conventional rotary compressor, and FIG. 4 is a sectional view of a compressor showing an embodiment of the present invention. FIG. 6 is a sectional view of the main part corresponding to FIG. 2, showing a state where it is incorporated into a refrigerator. 6°169. Sealed casing, 7... compression mechanism section,
8...Lubricating oil, 11...Inlet opening, 12
...Exit opening, 13'...Communication pipe, 1
4'...Slope part, 15'...Rise pipe A, 1
6'...Name of the start-up manager B0 agent Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3 14

Claims (1)

[Claims] It has a closed casing that houses a compression mechanism, lubricating oil, etc., and a communicating pipe that penetrates the sealed casing and has an inlet opening and an outlet opening that open above the lubricating oil surface, and this communicating pipe has , a riser pipe A that extends upward and is made of a round pipe, and a riser pipe A that is connected to the riser pipe A and is connected to the outlet opening and that is not a flat pipe; A cooling device for a compressor comprising an inclined pipe and a riser pipe B having an internal cross-sectional area of .