JPH02123297A - Rotary compressor - Google Patents

Abstract

PURPOSE:To make oil supply and lubrication smooth, cool a motor part, reduce the vibration of cooling medium gas, and reduce the noise by providing a partition plate including an oil hole and separating a closed casing to two chambers and a shaft having a connecting hole formed smaller at an aperture sectional area than at a middle part. CONSTITUTION:Cooling medium gas discharged from a discharge hole 14 passes through a gap of a motor part 2, cooling the motor part, to be discharged to a discharge chamber 19 on the opposite side of a machine part. The cooling gas passes through a connecting hole 23 of a shaft 8 to be discharged to a discharge chamber 20 on the opposite side of the motor part. During thus period, most of the vibration components of the cooling gas are eliminated by the muffler effect of the connecting hole 23, and it is discharged from a discharge tube 21 so as to reduce the noise. In addition, for a lubrication oil surface at the time of a compression action, flow of the cooling medium gas is separated by a partition plate 27 into the discharge chamber 20 on the opposite side of the motor part and discharge chambers 18, 19 on the side of the motor 2 to produce a pressure difference, so that lubrication oil surface 30 of the machine part 17 on the opposite side of the motor is kept at a necessary level for oil supply, thereby sure oil supply can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in a refrigeration cycle or the like.

BACKGROUND OF THE INVENTION A conventional rotary compressor will now be described by way of example with reference to the drawings.

FIG. 4 shows a cross section of a conventional rotary compressor.

In Fig. 4, 1 is a sealed casing, 2 is a motor section,
3 is a sub bearing, 4 is a main bearing, 5 is a cylinder, 6 is a roller piston, 7 is a vane, and 8 is a shaft. Further, reference numeral 9 denotes an eccentric portion of the shaft 8, and 10 denotes an oil supply hole provided in the auxiliary bearing 3, which communicates with a gap 11 formed between the shaft 8 and the inner circumference of the roller piston 6. 12 is a compression chamber formed between the cylinder 6 and the roller piston 6; 13 is a compression chamber 12;
14 is a discharge hole provided in the main bearing 4, and 15 is a discharge valve. 16 is a suction pipe communicating with the suction hole 13.

Further, reference numeral 17 denotes a mechanical section composed of an auxiliary bearing 3, a main bearing 4, a cylinder 6, and a roller piston 6. The mechanical section 17 and the electric motor section 2 are connected by a shaft 8 and arranged coaxially. 18 is a discharge chamber A which is a discharge space between the mechanical part 17 and the electric motor part 2 in the sealed casing 1; 19 is the electric motor part 2
2o is a discharge space B which is a discharge space on the side opposite to the mechanical part, and a discharge chamber 2o is a discharge space C which is a discharge space on the side opposite to the military machine part of the mechanical part 17.

21 is a discharge pipe arranged in the closed casing 1 forming the discharge chamber B 19, and 22 is lubricating oil.

The operation of the rotary compressor configured as above will be explained below.

As the electric motor unit 2 and shaft 8 rotate, refrigerant gas is sucked in from the suction pipe 16 through the suction hole 13 and is compressed in the compression chamber 12 and discharged from the discharge hole 14 into the discharge chamber A 18 .

At this time, it passes through the gap in the electric motor section 2, cools the electric motor section 2, and then is discharged into the discharge chamber B 19, and then discharged from the discharge pipe 21 to the refrigeration cycle /L/ (not shown).

In addition, since the lubricating oil 22 has an intermediate pressure in the gap 11,
Differential pressure oil is supplied to the gap 11 from the oil absorption hole 1o. The supplied lubricating oil 22 is supplied to each sliding surface and sealing surface via the shaft 8.

Problems to be Solved by the Invention However, in the above configuration, the refrigerant gas suffers a pressure loss while passing through the gap in the motor section 2, and the refrigerant gas pressure in the discharge chamber B 19 becomes lower than that in the discharge chamber A 18, and the pressure of the refrigerant gas in the discharge chamber 19 decreases. The oil level height of the lubricating oil 22 of No. 18 is lowered.

This simply interferes with lubrication. In addition, the electric motor section 2
Due to the stirring action of the rotor, a large amount of the lubricating oil 22 is discharged from the discharge pipe 21 to the heat exchanger along with the refrigerant gas, resulting in a decrease in system capacity and an increase in piping pressure loss. In addition, in order to suppress the temperature rise of the electric motor section 2,
Refrigerant gas is discharged to the motor section 2. Therefore, there was a problem in that the pulsation of the refrigerant gas was directly transmitted to the sealed casing 1, resulting in increased noise.

In view of the above-mentioned problems, the present invention aims at stabilizing the lubricating oil level to smoothly perform oil supply and lubrication, cool the electric motor part, reduce the pulsation of refrigerant gas, and reduce noise. The company provides compressors.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention includes a mechanical part and an electric motor part disposed in a sealed casing, and a cylinder and main bearings fixed to both ends of the cylinder. and a sub-bearing, and a partition plate disposed between the mechanical part and the electric motor part and having an oil hole that separates the inside of the sealed casing into two chambers;
A discharge hole opened on the motor side of the main bearing, a discharge pipe disposed in a sealed casing forming a space on the side opposite to the motor of the mechanical section, and a discharge pipe that connects the mechanical section and the electric motor section and has an opening cut off. The shaft has a communicating hole whose area is smaller than the cross-sectional area of the intermediate portion.

Operation The present invention has the above-described configuration, and the refrigerant gas discharged from the discharge hole passes through the gap in the motor section, cools the motor section, and is discharged into the discharge space on the side of the motor section away from the mechanical section. Thereafter, the refrigerant gas passes through the communication hole provided in the shaft and is discharged into the discharge space on the anti-military machine section side of the mechanical section. During this time, most of the pulsating components of the refrigerant gas are removed by the muffler effect of the communication holes, and the refrigerant gas is discharged from the discharge pipe, thereby reducing noise. In addition, the lubricating oil level during compression operation is achieved by dividing the flow of refrigerant gas into two chambers: the discharge space on the side opposite to the electric machine section of the mechanical section and the discharge space on the side of the electric motor section of the mechanical section. ,
A pressure difference is created between the two chambers to maintain the lubricating oil level on the anti-military machine side of the machine at a level higher than that required for refueling - this ensures a sufficient amount of refueling and ensures reliable refueling. .

Example An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted. The discharge pipe 21 is arranged in the closed casing 1 forming a discharge C chamber 2o. 23 is a communication hole provided in the shaft 8, and 24 is an inlet opening provided on the motor side of the communication hole 23. 26 is an outlet opening provided on the machine side of the communication hole 23, and 26 is an inlet opening 2 of the communication hole 23.
4 and the outlet opening 26. The cross-sectional area of the intermediate portion 2θ is larger than the cross-sectional area of the inlet/outlet openings 22°230. Reference numeral 27 denotes a partition plate that divides the inside of the sealed casing 1 into two chambers, one on the mechanical side and the other on the electric motor side, and is tightly fixed to the inner periphery of the sealed casing 1 and the main bearing 4. 28 is the cylinder end face of the partition plate 27 and the partition plate 27
This is an oil passage provided near the outer periphery of the surface that is in contact with the oil passage.

29 is a lubricating oil 22 existing between the mechanical part 17 and the electric motor part 2
30 is the oil level B of the lubricating oil 22 present on the side opposite to the motor of the mechanical part 170. 31 is an opening end face of the oil supply hole 1o.

In the above configuration, the refrigerant gas discharged into the discharge chamber A 18 through the discharge hole 14 passes through the gap in the motor section 2, cools the motor section 2, and is discharged into the discharge chamber B 19. Next, the refrigerant gas flows from the inlet opening 24 of the communication hole 23 in the shaft 8 to a medium length.
It passes through the first part 26 and is discharged from the outlet opening 26 into the discharge C chamber 2Q. As a result, the pressure pulsation component of the refrigerant gas is attenuated by passing through the communication hole 23 to obtain a shimmer effect. Thereafter, the refrigerant gas is discharged from the discharge pipe 21 to a refrigerant (not shown). In addition, the lubricating oil 22 during the compression operation is controlled by the partition plate 27 to prevent the flow of refrigerant gas.
Dividing into two chambers, the discharge C chamber 2o and the discharge A-B chamber 18.19, creates a pressure difference between the two chambers, and the discharge C chamber 2Q is
・The pressure is lower than that in the B chamber 18.19, and the discharge A-B chamber 18.
19 to the discharge chamber C 2°, the oil passage 28 of the partition plate 27
move through.

As a result, the height of the oil level B3o is higher than the height of the oil level A29, and the opening end face 31 of the oil supply hole 10 can be sufficiently filled with the lubricating oil 22, and the mechanical part 17 can be sufficiently lubricated. , can ensure normal lubrication.

Effects of the Invention As is clear from the above description, the present invention includes a mechanical part and a motor part arranged in a sealed casing, a cylinder, a main bearing and a sub bearing fixed to both ends of the cylinder, and the mechanical part. and a partition plate having an oil hole that separates the interior of the sealed casing into two chambers; a discharge hole that opens on the motor side of the main bearing; By providing a discharge pipe disposed in a sealed casing that forms a space, and a shaft that connects the mechanical part and the electric motor part and has a communication hole whose opening cross-sectional area is smaller than the intermediate cross-sectional area, While cooling the electric motor part,
The muffler effect of the communication hole provided in the shaft can attenuate the pulsating components of the refrigerant gas, and the flow of the refrigerant gas is divided into two chambers by a partition plate, and the resulting pressure difference is used to control the mechanical parts. By ensuring the oil level of the lubricating oil present on the anti-military machine side of the machine is at a sufficient height, the mechanical parts can be sufficiently lubricated. This makes it possible to ensure low noise and normal lubrication of the press machine.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a shaft in a rotary compressor showing an embodiment of the present invention, Fig. 2 is a sectional view of a partition plate in the same compressor, and Fig. 3 is a sectional view of the same compressor. Longitudinal cross-sectional view of 4th. The figure is a longitudinal sectional view of a conventional rotary compressor. 1... Sealed casing, 2... Electric motor section, 3... Sub bearing, 4... Main bearing, 6
...Cylinder, 8...Shaft, 14
...Discharge hole, 17...Mechanical part, 21.
...Discharge pipe, 23...Communication hole, 27...
...Partition plate, 28...Oil hole. No.! Reason 8->Ift-Nka S1/) 18th season

Claims (1)

[Claims] A mechanical part and an electric motor part are disposed in a sealed casing, a cylinder, a main bearing and a sub bearing fixed to both ends of the cylinder, and a cylinder disposed between the mechanical part and the electric motor part and arranged inside the sealed casing. a partition plate having an oil passage that separates it into two chambers, a discharge hole opening on the motor side of the main bearing, and a discharge pipe disposed in a sealed casing forming a space on the side opposite to the motor of the mechanical part. A rotary compressor, comprising: a shaft connecting the mechanical part and the electric motor part and having a communication hole having an opening cross-sectional area smaller than an intermediate cross-sectional area.