JPS6019983A - Rotary compressor - Google Patents

Abstract

PURPOSE:To improve a radiating effect, by dividing the inside of an enclosed casing into two chambers through a partition part, and applying a pressure differential to space between these two chambers in a positive manner, while increasing the flow rate of refrigerant gas and a liquid refrigerant circulating in an interconnecting pipe with use of this pressure differential. CONSTITUTION:Since the inside of an enclosed casing 1 is divided into two chambers through a partition part 25, a high pressure chamber 1a, where a discharge hole 16 and a discharge pipe 13 both are opened, becomes a high pressure of 0.01-0.02kg/cm<3> as compared with a medium pressure chamber 1b. Accordingly, when an inlet opening part 18 is opened to the high pressure chamber 1a and an outlet opening part 19 is opened to the medium pressure chamber 1b, circulation of a refrigerant flowing inside an interconnecting pipe 20 is more accelerated than ever before by a pressure differential in consequence so that a refrigerant amount to be liquefied is increased by improvements in a radiating effect at a radiator part 21, thus the radiating effect of a compressor can be improved.

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 A conventional configuration will be explained with reference to FIGS. 1 and 2.

1 is a sealed casing, 2 is an electric motor section, and shaft 3
Through the cylinder 4, piston 5, base 76, main bearing 7
, a sub-bearing 8 and an oil supply mechanism 9. 11 is a compression chamber configured within the cylinder 4. 12 is a suction pipe, and 13 is a discharge pipe. The suction pipe 12 directly communicates with the suction hole 14 of the cylinder 4 via the sub-bearing 8, and the discharge pipe 13 is open into the sealed casing 1. Further, 16 is a discharge hole, which communicates the compression chamber 11 with the inside of the sealed casing 1 via the discharge valve 16. 17
is lubricating oil stored at the bottom of the sealed casing. 18.
Reference numeral 19 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 17. The inlet opening 18 and the outlet opening 19 communicate with each other through a communication pipe 2o disposed above the sealed casing 1. 21 is the top 20 of the communication pipe 2o
'The heat dissipation section provided at the outlet opening 19 connects the inlet opening 18, the outlet opening 19 and the riser pipe 22, respectively.
, are in communication via a riser pipe 23. Further, 24 is a heat insulating material for insulating the riser pipe 23. While the compressor is in operation, the refrigerant gas flowing into the refrigeration cycle (not shown) through the suction pipe 12 and suction hole 14 is compressed in the compression chamber 11 and reaches a high temperature, as indicated by the arrow in the figure. The high-pressure gas becomes a high-pressure gas and is discharged into the sealed casing 1 through the discharge hole 15 and the discharge valve 16. Most of the high-temperature, high-pressure refrigerant in this sealed casing 1 is discharged from the discharge pipe 13 into the refrigeration cycle.
A portion fills the inside of the communication pipe 20, and the heat dissipation part 21 of the communication pipe 20
It is condensed and liquefied. The condensed and liquefied liquid refrigerant drips inside the tube of the heat dissipation section 21 due to its own weight, and passes through the riser tube 22 and the outlet opening 1.
9 into the sealed casing 1. Due to this dripping of the liquid refrigerant, the pressure inside the communication pipe 2o decreases, and the high-temperature refrigerant gas inside the sealed casing 1 flows through the inlet opening 18 and the riser pipe 23.
The heat radiating section 21 is replenished via the heat sink. Therefore, the communication pipe 22
Inside, the flow of high-temperature refrigerant gas toward the heat radiator 21 via the inlet opening 18 and the riser pipe 23, and the refrigerant partially liquefied in the heat radiator 21, flow through the riser pipe 22 and the outlet opening 19. A flow toward the inside of the closed casing 1 through the casing 1 continuously occurs as shown by the arrows in FIG. At this time, riser pipe 2
3. It is insulated with a heat insulating material 24, and the vertical pipe 23
The refrigerant is not condensed and liquefied within the riser pipe 23, so that the liquid refrigerant flows back through the riser pipe 23. Never.

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 cools the compressor.

Furthermore, while the compressor is stopped, the temperature of the refrigerant gas in the hermetic casing 1 decreases, so that almost no heat is radiated from the heat radiating section 21, and the compressor is cooled only by natural heat radiation from the hermetic casing 1.

In the conventional example with the above configuration, since the amount of refrigerant flowing through the communication pipe 20 is determined only by natural convection, the flow rate of the refrigerant in the communication pipe 20 is slow, and the heat radiation part 21 cannot achieve a sufficient heat radiation effect. In order to obtain a sufficient cooling effect, it is necessary to increase the length of the heat radiation part 21 and increase the amount of heat radiation. However, when actually applied to a refrigerator or the like, if the heat dissipation section 21 is lengthened, the length of the riser tube 23 also becomes longer, which may cause problems such as condensation and liquefaction before reaching the heat dissipation section 21 and backflow, and structural problems such as
The limit of the length of 0 is 3 to 6 m, and this length has the drawback that a sufficient cooling effect cannot be obtained.

OBJECTS OF THE INVENTION An object of the present invention is to improve the heat radiation effect of the heat radiation section by increasing the amount of refrigerant flowing through the communication pipe and increasing the flow velocity in the pipe.

Structure of the Invention In order to achieve this object, the present invention divides the inside of the hermetic couching into two chambers with a partition, actively creates a pressure difference between the two chambers, and connects the inlet opening of the communication pipe to the high pressure chamber side. In addition, the outlet side opening is opened toward the low pressure chamber side, and the flow rate of the refrigerant gas and liquid refrigerant circulating through the communication pipe is increased using the pressure difference, thereby improving the heat dissipation effect.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Incidentally, the same parts as those in the conventional example are given the same numbers and the explanation is omitted. Reference numeral 26 denotes a partition portion that also functions as the cylinder 4, and divides the inside of the sealed casing 1 into two pressure-wise areas: a high-pressure chamber 1a and an intermediate-pressure chamber 1b. In addition, lubricating oil 1 is provided below the partition part 25.
A communication passage 26 is opened below the oil level of 7. Then, the inlet opening 18 of the communication pipe 2o is connected to the high pressure chamber 1a side, and the inlet opening 18 of the communication pipe 2o is connected to the medium pressure chamber 1b side.
An outlet opening 19 is arranged at.

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 1, and most of it is discharged from the discharge pipe 6 into the refrigeration cycle (not shown). .

In addition, the refrigerant condensed and liquefied in the heat radiation part 21 drips into the communication pipe 2o from the closed casing 1 to the inlet opening 18, the riser pipe 23, the heat radiation part 21, the riser pipe 22, and the outlet opening 19. A flow of refrigerant back to the closed casing 1 via the refrigerant takes place in the conventional manner.

At this time, since the inside of the sealed casing 1 is divided into two chambers by the partition part 25, the discharge hole 16 and the discharge pipe 13 are generally
The opening of the high pressure chamber 1a is about 0,0 compared to the medium pressure chamber 1b.
1 to 0,02 Kp/l: The pressure is about ytr high.

Therefore, when the inlet opening 18 is opened in the high pressure chamber 1a and the outlet opening 19 is opened in the intermediate pressure chamber 1b, the circulation of the refrigerant flowing through the communication pipe 20 is promoted due to the pressure difference than in the past, and the heat dissipation section By improving the heat dissipation effect in step 21, the amount of refrigerant to be liquefied increases, and the cooling effect of the compressor can be improved.

In addition, a communication passage 26 is opened in the partition portion 25, and the pressure difference between the high pressure chamber 1a and the intermediate pressure chamber 1b is 0.021r//crA.
Therefore, if there is a large amount of lubricating oil in the intermediate pressure chamber 1b, it will be returned to the high pressure chamber 1a via the communication path 26 due to the head difference due to its own weight, and there will be no problem in terms of lubrication.

In the present invention, an example has been described in which the side where the discharge hole 16 and the discharge pipe 13 open becomes the high pressure chamber 1a. In some cases, the pressure may be higher than that on the main body 10 side, and in this case, there is an outlet opening 19 on the mechanical part main body side 10.
, the communication pipe 20 may be arranged so that the inlet opening 18 opens on the motor section 2 side. 1, the partition part 25 is connected to the cylinder 4
We have explained the case where the airtight casing 1 is divided into two chambers and there is a pressure difference between the two chambers.
Any partition 25 may be used, and the high pressure chamber 1a and the intermediate pressure chamber 1 may be
If the pressure difference between the two portions b is too large, a through hole may be provided in the partition portion 25 to ensure an appropriate pressure difference.

Effects of the Invention As is clear from the above description, the present invention divides the inside of a sealed casing into a high-pressure chamber and an intermediate-pressure chamber, and also includes a partition section provided with a communication path for lubricating oil, and an inlet opening in the high-pressure chamber. part, a communication pipe that opens an outlet opening in the intermediate pressure chamber and extends upward, and a heat dissipation part between the top of the communication pipe and the outlet opening, and the amount of refrigerant flowing into the communication pipe is reduced due to the pressure difference. This increases the heat dissipation effect in the heat dissipation section, making it possible to efficiently cool the compressor.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional rotary compressor, Fig. 2 is a sectional view taken along line nn' in Fig. 1, and Fig. 3 is a sectional view of a rotary compressor showing an embodiment of the present invention. FIG. 4 is a sectional view taken along the line ■-■' in FIG. 3. 1... Sealed casing, 1a... High pressure chamber, 1bi... Medium pressure chamber, 20... Continuous pipe, 21
... Heat dissipation section, 25 ... Partition section, 18 ...
Inlet opening, 19...Exit opening, 26...
Communication path.

Claims (1)

[Claims] A sealed casing that houses a compression mechanism, lubricating oil, and an electric motor, and a partition that divides the inside of the sealed casing into two chambers, a high-pressure chamber and an intermediate-pressure chamber, and has a communication path for lubricating oil. a communicating pipe that extends upward and has an inlet opening disposed on the high pressure chamber side of the closed casing and an outlet opening disposed on the intermediate pressure chamber side above the lubricating oil level; and a top portion of the communicating pipe. and a heat dissipation section between the outlet opening and the rotary compressor.