JPS6050296A - Rotary compressor - Google Patents

Abstract

PURPOSE:To suppress vibration of cooling tube and to reduce noise of compressor by providing a cooling tube extending upward while having the opposite ends opened near the center of casing above the lubricant level in an enclosed casing. CONSTITUTION:Inlet and outlet openings 14, 15 of cooling tube 13 are penetrating through the wall face of an enclosed casing 1 while an open end is provided near the center of cylindrical shaft of enclosed casing. The sound pressure distribution in the enclosed casing is such that the sound pressure level is lowest near the cylindrical shaft in the enclosed casing 1 and since the inlet/outlet openings of cooling tube are provided at such portion, transmission of pressure pulse to the cooling tube is lowered, resulting in reduction of vibration of cooling tube.

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.

Conventional configuration and its problems A conventional configuration will be explained with reference to FIG.

1 is a sealed casing, inside which is a compression mechanism section 2.
is stored. 3 is a suction pipe, 4 is a discharge pipe, and the suction pipe 3 is in direct communication with the compression mechanism section 2 via the sealed casing 1. The discharge pipe 4 is connected to a condenser 6 and an expansion device 6
, communicates with the suction pipe 3 via the evaporator 7 to constitute a refrigeration system.

Reference numerals 8 and 9 denote an inlet opening and an outlet opening provided on the upper wall surface of the sealed casing 1, and each is provided at a position above the oil level of the lubricating oil 10. The inlet opening 8 and the outlet opening 9 communicate with each other through a communication pipe 13 consisting of rising parts 11a, 11b and an inclined part 12 provided at the top thereof.

In the above configuration, during operation of the compressor, the closed casing 1
The inside of the communication pipe 13 is filled with high-temperature and high-pressure refrigerant gas, but when the heat is radiated particularly at the inclined portion 12 and the refrigerant liquefies,
The liquid refrigerant begins to drip down the inclined portion 12 due to its own weight, and reaches the inside of the sealed casing 1 via the outlet opening 9 of the rising portion 11b1. When this liquid refrigerant comes into contact with a high-temperature part in the sealed casing 1 and vaporizes, it removes heat and cools the compressor, thereby improving efficiency and reliability.

However, the inlet opening 8 and the outlet opening 9 are
Because it opens directly close to the inner wall surface of the compressor, the high-frequency pressure pulsations generated in the compression mechanism section 2 are transmitted to the communication pipe 3 and the communication pipe 13, causing the communication pipe to resonate and generate vibrations and noise. .

OBJECTS OF THE INVENTION An object of the present invention is to reduce the transmission level of pressure pulsations, suppress the vibrations of the communication pipes, and suppress the generation of vibrations and noise without suppressing the flow of refrigerant gas into the communication pipes.

DESCRIPTION OF THE INVENTION In order to achieve this object, the inlet and outlet openings of the communicating pipe are each arranged in a cylindrical center 11 in a closed casing.
By providing it near No. 11, that is, at the node of resonance caused by high-frequency pressure pulsations in the sealed case, the level of transmission of high-frequency pressure pulsations into the communication pipe is reduced, and vibration of the communication pipe is suppressed.

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 in the prior art are given the same reference numerals, and the explanation will be omitted.

14, 16 and 1 are the inlet and outlet openings of the communication pipe 13, which penetrate the wall surface of the sealed case 1 and have their open ends near the cylindrical axis of the sealed case.0 In the above configuration, As shown in Figures 3 and 4, the sound pressure distribution of pressure pulsations in the sealed case is a resonance mode in which nodes An air column resonance is occurring, and the high pressure level is lowest near the cylindrical axis inside the sealed case 1. Therefore, since the communication pipe 130 inlet opening 14 and outlet opening 15 are each provided near the center of the cylinder ll1l in the sealed case 1, the sound pressure level around the inlet and outlet openings 14 and 15 is the lowest. Therefore, the amount of high-frequency pressure pulsation transmitted to the communication pipe 13 is minimized, and the vibration of the communication pipe 13 due to the transmitted pressure pulsation is also minimized.

Effects of the Invention As described above, the present invention includes a substantially cylindrical sealed casing that houses a compression mechanism, lubricating oil, etc. and is filled with high-temperature, high-pressure gas, and a sealed casing that penetrates the sealed casing and has both ends sealed. By installing both open ends of the communicating pipe in the vicinity of the cylindrical axis of the closed case, noise to the communicating pipe can be reduced. The open end, which is the pressure transmission port,
Since it is set at the resonance node in the sealed case, that is, the position with the lowest sound pressure level, it is possible to reduce the transmission of pressure pulsations to the communication pipe, and prevent vibration of the communication pipe due to pressure pulsations. Vibration and noise can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a rotary compressor as a conventional example, Fig. 2 is a sectional view of a rotary compressor of the present invention, and Fig. 3 is a resonance mode in the sealed case of the rotary compressor of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-IV' in FIG. 3. DESCRIPTION OF SYMBOLS 1... Sealed casing, 2... Compression mechanism section, 13... Communication pipe, 14... Inlet opening, 15... Outlet Aperture. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 10 Figure 2 131? Zt. Figure 3 629

Claims (1)

[Claims] A substantially cylindrical sealed casing that houses a compression mechanism, lubricating oil, etc. and is filled with high-temperature, high-pressure gas, and an axis of the sealed casing that penetrates the sealed casing and is above the lubricating oil level. A rotary compressor having both ends open near the core and a communicating pipe extending upward.