JPH01219384A - Compressor - Google Patents

Abstract

PURPOSE:To prevent any oil outflow of a refrigerating cycle from occurring by installing an interconnecting passage between a shaft and a rotor, while opening a discharge passage in and around an upper part of the discharge passage interconnecting two discharge chambers. CONSTITUTION:An interconnecting passage 18 is installed between a rotor 2a and a shaft 7, and a second discharge chamber 15 and a third discharge chamber 16 are interconnected to each other. In addition, there is provided with a discharge passage 19 which interconnects a first discharge chamber 14 to the second discharge chamber 15, and an opening 20 at the lower end is opened to the upper vicinity of the interconnecting passage 18. A refrigerant discharged out of a discharge hole 9 passes through the discharge passage 19, getting into the interconnecting passage 18 by way of the opening 20 and flows in the lower part of a motor part 2. Then, only the refrigerant is discharged out of a discharge pipe 12 by way of the circumference of the motor part 2. Thus, any oil outflow into a refrigerating cycle is preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to oil separation in compressors used in refrigeration cycles and the like.

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

FIG. 3 shows a cross section of a conventional scroll compressor. In FIG. 3, 1 is a sealed casing, 2 is a motor, 3 is a block, 4 is a fixed scroll, and 6 is an orbiting scroll. The motor 2 is composed of a rotor 2a and a stator 2b. The fixed scroll 4, the orbiting scroll/
v5 has a wrap 4a and a wrap 6a, respectively.

Reference numeral 6 denotes an autorotation prevention mechanism that prevents the orbiting scroll 6 from rotating and allows it to perform an orbiting motion. A shaft 7 is rotatably inserted into the block 3 with a clearance, and has an oil supply hole 7a. Reference numeral 8 represents a suction hole for introducing a refrigerant between the flow valves and V4.5, and reference numeral 9 represents a discharge hole provided at the center of the fixed scroll 4. 10 is a block 3, a fixed scroll 4, an orbiting scroll 6,
This is a mechanical part consisting of a rotation prevention mechanism 6. 11 is a suction pipe connected to the suction hole 8, and 12 is a discharge pipe attached to the sealed casing 1.

Moreover, 13 is a compression chamber formed between the wrap 4& and the wrap 6a.゛Also, 14 is a first discharge chamber located above the mechanical part, 16 is a second discharge chamber located between the mechanical part 1o and the motor 2, and 16 is a third discharge chamber located below the motor 2. kept under pressure.

Further, lubricating oil 17 is collected in the lower part of the sealed casing 1.

Regarding the scroll compressor configured as above,
The operation will be explained below.

As the motor 2 and the rotor 7a rotate, the orbiting scroll 6 performs an orbiting motion by the rotation prevention mechanism 6, and the refrigerant gas sucked from the suction pipe 11 through the suction hole 8 flows into the compression chamber 1.
3, and is discharged from the discharge hole 9 into the first discharge chamber 14 above the sealed casing 1, and then into the second discharge chamber 16 and the third discharge chamber 16.
After flowing into the discharge chamber 16 and cooling the motor 2, the discharge pipe 1゛2
From there, it is discharged into a frozen rhinoceros 2)v (not shown).

In addition, the lubricating oil 17 accumulated in the lower part of the sealed casing 1 passes through the oil supply hole 7a of the shaft 7 and is supplied to each sliding part.
It flows to the bottom end of block 3 or to the top of shirt 7.

Problem to be Solved by the Invention However, in the above configuration, the oil-containing refrigerant discharged from the discharge hole 9 flows below the block 3, finishes lubricating the shaft 7, and then flows out from the lower end of the block 3. As the rotor 2a rotates, the oil scatters and becomes a mist, and is discharged together with the refrigerant from the discharge pipe 12 into the refrigeration cycle, resulting in a problem in that the oil leaks into the refrigeration cycle.

In view of the above problems, the present invention provides a compressor that causes less oil leakage into the refrigeration cycle.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes a mechanical part in a sealed casing, a motor part consisting of a rotor and a stator, a first discharge chamber above the mechanical part, and a mechanical part. and a second discharge chamber between the motor section and the motor section, a third discharge chamber below the motor, and a shaft connecting the mechanical section and the rotor, with a communication passage provided at the lower end of the machine and between the shaft and the rotor. In addition, a discharge passage communicating the first discharge chamber and the second discharge chamber is provided, and the discharge passage opens near the upper part of the communication passage.

Operation According to the above-described structure of the present invention, the refrigerant discharged from the discharge hole passes through the discharge passage and flows downward from the lower end of the mechanical part. In other words, the oil that flows out from the bottom end of the mechanical block after lubrication of the shaft does not scatter to the top of the motor, but instead flows downwards of the motor with the refrigerant and falls, and only the refrigerant passes through the outer circumference of the motor and is discharged from the discharge pipe. Therefore, oil leakage into the refrigeration cycle can be prevented.

Example Below, regarding a scroll compressor according to an example of the present invention,
The description will be made with reference to the drawings, but the same components as those of the prior art will be denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line 1-1' in FIG. Note that arrows indicate the flow of refrigerant.

In FIG. 1, reference numeral 18 denotes a communication passage provided between the rotor and the shaft 7, which communicates the second discharge chamber 16 and the third discharge chamber 16. Reference numeral 19 denotes a discharge passage that communicates the first discharge chamber 14 and the second discharge chamber 16, and an opening 20 at the lower end opens near the upper part of the communication passage 18.

According to this embodiment, the refrigerant discharged from the discharge hole 9 passes through the discharge passage 19, enters the communication passage 18 through the opening 2o, and flows below the motor section 2. Further, the oil flowing out from the lower end of the block 3 after lubrication of the shaft 7 does not scatter to the upper part of the motor section 2 but falls downward from the communication path 18 because the refrigerant flow is directed downward. And only the refrigerant is in the motor section 2.
Since the oil is discharged from the discharge pipe 12 through the outer periphery of the oil, it is possible to prevent oil from leaking into the refrigeration cycle.

Further, the communication passage 18 may be provided in the rotor 2a as shown in FIGS. 1 and 2, or the communication passage 18 may be provided in the shaft 7 as shown in FIG.

Note that the scroll compressor described above is only an example, and compressors of other compression methods may be used.

Effects of the Invention As described above, the present invention includes a mechanical part in a sealed casing,
A motor section consisting of a rotor and a stator, a first discharge chamber above the mechanical section, a second discharge chamber between the mechanical section and the motor, a third discharge chamber below the motor, and a shaft connecting the mechanical section and the rotor. A connecting passage is provided between the shaft and the rotor, a discharge passage is provided that communicates the first discharge chamber with the second discharge chamber, and the discharge passage is opened near the upper part of the communication passage, whereby the lower end of the machine is Since only the refrigerant that has fallen downward without being scattered is discharged through the outer periphery of the motor section, oil leakage into the refrigerant cycle can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 1-1' in FIG. 1, FIG. 3 is a sectional view of another embodiment, and FIG. The figure is a sectional view of a conventional compressor. 1... Sealed casing, 2... Motor section, 2a... Rotor, 2b... Stator, 7... Shaft, 1o... ...Mechanical part, 14...First discharge chamber, 16...Second
Discharge chamber, 16...Third discharge chamber, 18...
・Communication path, 19...Discharge path, 2o...
·Aperture. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--A beggar casing? - Motor Miyako 2 - Loader 2b - Stake 7 - Bubutoia! 2t! i turtle

Claims (1)

[Claims] A mechanical part in a sealed casing, a motor part consisting of a rotor and a stator, a first discharge chamber above the mechanical part, a second discharge chamber between the mechanical part and the motor part, and a third discharge chamber below the motor. comprising a discharge chamber and a shaft connecting the mechanical part and the rotor, providing a communication passage between the shaft and the rotor, and providing a discharge passage communicating the first discharge chamber and the second discharge chamber; A compressor in which the discharge passage is opened near the upper part of the communication passage.