JPS6019981A - Rotary compressor - Google Patents

Abstract

PURPOSE:To utilize a fact that lubricating oil moves according to the outside temperature and thereby control the cooling operation of a compressor by means of an interconnecting pipe, by having an inlet opening part of refrigerant gas in the interconnecting pipe situated a little upward a level of the lubricating oil inside an enclosed casing. CONSTITUTION:An inlet opening part of refrigerant gas in an interconnecting pipe 8 is situated upward a level A of lubricating oil 3 when the outside temperature is required for cooling a compressor and simultaneously situated downward a level B of the lubricating oil 3 when the outside temperature is unrequired for cooling the compressor. That is to say, the amount of dissolution in the lubricating oil 3 against the refrigerant has such a characteristic as being the lower in temperature the larger in refrigerant dissolution at the same pressure. Therefore, the height of a level of the lubricating oil 3 inside an enclosed casing 1 goes up as much as a portion for being plenty in the refrigerant amount dissolved to the lubricating oil 3 much in time of the outside temperature being lower than in case of being high so that the inlet opening part 6 of the refrigerant is installed in position between these levels A and B of the lubricating oil 3.

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. 1 is a sealed casing, inside which is a compression mechanism section 2. Contains lubricating oil 3, etc. 4 is a suction pipe, and 6 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 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 heat dissipation section having an inclination formed from the top of the communication pipe 8 to the outlet opening 7, and includes the inlet opening 6. It communicates with the outlet opening 7 via a riser pipe A11 with a heat insulating material 10 and a riser pipe B13 with a heat dissipating material 12, respectively.

While the compressor is in operation, refrigerant gas flowing from the refrigeration cycle (not shown) through the suction pipe 4 is compressed within the compression mechanism section 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 of the communication pipe 8.゛In particular, when the refrigerant liquefies in the heat radiating section 9, the liquid refrigerant begins to drip down the heat radiating section 9 due to its own weight, and flows into the riser pipe B13. It reaches the inside of the sealed casing 1 through the outlet opening 7.

Due to this dripping of the liquid refrigerant, the pressure in the communication pipe 8 near the heat radiating section 9 decreases, and the high temperature refrigerant gas in the sealed casing 1 flows through the inlet opening 6. The heat radiating section 9 is replenished via the riser pipe A11. Therefore, within the communication pipe 8, the inlet opening 6 and the
The flow of high-temperature refrigerant gas toward the heat radiating section 9 via the riser pipe A11 having a heat insulating material 10 for preventing condensation and liquefaction of the high-temperature refrigerant gas, and the refrigerant partially liquefied in the heat radiating section 9 are carried out in the riser pipe. A flow through the B13° outlet opening 7 into the closed casing 1 will occur continuously as indicated by the arrow in FIG. As a result, liquid refrigerant is constantly 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.

However, in the above configuration, the flow of refrigerant in the above-mentioned communication pipe 8 is affected by the outside temperature and the ON-OFF state of compressor operation.
This occurs regardless of the situation. Therefore, if the compressor does not need cooling (for example, it is necessary to cool the compressor when the outside air temperature is 30°C, but cooling the compressor when the outside air temperature is 15°C may result in a decrease in performance). However, a cooling effect also occurs in the compressor, causing problems such as overcooling of the compressor and deterioration of performance.

OBJECTS OF THE INVENTION An object of the present invention is to generate a flow of refrigerant gas in the communication pipe only when cooling of the compressor is necessary, thereby cooling the compressor and improving performance.

Structure of the Invention In order to achieve this object, the present invention locates the refrigerant gas inlet opening of the communication pipe slightly above the lubricating oil level in the sealed casing, so that the lubricating oil moves according to the outside temperature. This is used to control the cooling of the compressor through the communication pipe.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Incidentally, the same parts as in the conventional example are given the same numbers, and the explanation will be omitted.

In FIG. 2, the refrigerant gas inlet opening 6 of the communication pipe 8 is located above the lubricating oil 3 surface A at an outside air temperature (for example, 30° C.) that requires cooling the compressor, and does not require cooling the compressor. The lubricating oil 3 is located below the surface B of the lubricating oil at a normal outside temperature (for example, 15° C.).

That is, as shown in FIG. 3, the amount of lubricating oil 3 dissolved in the refrigerant has a characteristic that, at the same pressure, the lower the temperature, the greater the amount of refrigerant dissolved. Therefore, the height of the lubricating oil 3 inside the sealed casing 1 is higher when the outside temperature is 15°C than when it is 30'C, as the amount of refrigerant dissolved in the lubricating oil 3 is larger. , a refrigerant inlet opening 6 is provided at the above location.

In the above configuration, when the outside air temperature is 3'O<0>C, the height of the lubricating oil 3 surface A is below the inlet opening 6 as shown in FIG. 14
Most of the high-temperature, high-pressure gas compressed in the compression mechanism section 2 is discharged from the discharge pipe 5 to a refrigeration cycle (not shown), and a portion flows into the communication pipe 8 . and,
The refrigerant is liquefied in the heat dissipation section 9 of the communication pipe 8, reaches the inside of the sealed casing 1 via the outlet opening 7, and when vaporized, removes heat and cools the compressor.

Next, when the outside air temperature is 15°C, the amount of refrigerant dissolved in the lubricating oil 3 increases compared to when the outside temperature is 30°C, so the height of the lubricating oil 3 surface B is increased at the inlet opening 6 as shown in FIG. will be above.

Therefore, the inlet opening 6 is sealed with the lubricating oil 3, and the high-temperature, high-pressure gas compressed within the compression mechanism section 2 does not flow into the communication pipe 8, and the compressor is not cooled after all. It disappears.

As mentioned above, when the outside air temperature is high and the compressor needs to be cooled, the refrigerant is condensed and liquefied in the communication pipe 8 to cool the compressor, and when the outside air temperature is low and the compressor does not need to be cooled, , the refrigerant is not allowed to flow into the communication pipe 8, the compressor is not cooled, and the compressor can be controlled to be cooled only when necessary according to the outside air temperature.

Effects of the Invention As is clear from the above description, the present invention provides an inlet opening of a communication pipe for condensing and liquefying high-temperature, high-pressure gas to a low outside temperature on the lubricating oil surface in a sealed casing that changes depending on the outside temperature. Since it is installed at a position lower than the oil level when the outside temperature is high and higher than the oil level when the outside temperature is high, the compressor is cooled when the outside temperature is high, and the compressor is not cooled by the communication pipe when the outside temperature is low. It is possible to improve the performance compared to the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional rotary compressor, Fig. 2 is a sectional view of a rotary compressor showing an embodiment of the present invention, and Fig. 3 is a diagram showing the characteristics of refrigerant dissolution amount with respect to outside air temperature. It is. 1... Sealed casing, 2... Compression mechanism section, 3... Lubricating oil, 8... Communication pipe,
9...Heat radiation part, 11...Rise pipe A,
13... Name of riser B0 agent Patent attorney
Toshio Nakao and 1 other person Figure 1 Figure 2 Figure 3 Outside S temperature

Claims (1)

[Scope of Claims] A hermetic casing housing a compression mechanism, lubricating oil, etc., and a communication pipe passing through the hermetic casing and having both ends open inside the hermetic casing, and a riser pipe of one of the communication pipes. has a heat dissipation part, and the open end of the other riser pipe protrudes into the sealed casing, and is located at a position higher than the oil level of the lubricating oil when the outside temperature is particularly low and higher than the oil level when the outside temperature is high. A rotary compressor set to