JPS61192888A - Closed type compressor - Google Patents

Abstract

PURPOSE:To enable to prevent the outflow of lubricating oil into a refrigerating cycle by forming an oil reservoir at the end of the boss part of the upper bearing in a closed type rotary compressor, and returning the oil collected in this oil reservoir to the lower part of a vessel by dead load via a communicating passage. CONSTITUTION:A ring-formed oil reservoir 18 is formed on the end surface of the boss part of an upper bearing 15 in a closed type rotary compressor, and this oil reservoir 18 is communicated to the lower part of the boss part through a communicating passage 19. Thus, the lubricating oil leaked out from the end of the boss part of the upper bearing 15 is led to the lower part of a vessel via the oil reservoir 18 and communicating passage 19, and accordingly the leaked oil can be prevented from being changed into mist by the turbulent flow of discharge gas which has been agitated by the rotor 27 of a motor and outflowing into a refrigerating cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hermetic compressor having a rotary compression mechanism designed to suppress the amount of lubricating oil discharged during high-speed rotation.

2. Description of the Related Art Conventional hermetic compressors of this type are known as
As shown in Japanese Patent No. 1009, it had a structure as shown in FIG. That is, a lubricating oil reservoir 2 is provided at the inner bottom of a closed container 1, a compressor main body 3 is immersed in this reservoir 2, and the compressed gas once discharged from the compressor main body 3 is guided to the outside. A conduction path 4, an oil conduction path 6 for raising lubricating oil and supplying it to each sliding part, and a gas vent hole 6 provided in communication with the oil conduction path 6 are provided. A rotatable separation plate 7 was provided opposite the gas conduction path 4 to separate oil by centrifugal force.

Problems to be Solved by the Invention However, with such a structure, when the compressor main body 3 is operated at high speed, the velocity of the refrigerant gas passing through the gas passage 4 becomes very large, and therefore the refrigerant A large amount of lubricating oil is also discharged to the upper part of the closed container 1 or to the outside of the closed container 1 due to the gas. Further, the lubricating oil floating in the upper part of the closed container 1 is difficult to fall into the reservoir 2 because the gas flow rate is high. Therefore, there are problems in that the reliability of the compressor main body a is lowered, and the heat transfer coefficient on the refrigerant side of the evaporator during formation of the refrigeration cycle is lowered, resulting in a lower refrigerating capacity.

Means for Solving the Problems In order to solve the above problems, the present invention provides a cylinder portion formed by a cylindrical member, upper and lower bearing members provided so as to close the upper and lower end surfaces of the cylindrical member, and A hermetic compressor is constituted by a rotary compression mechanism provided in the upper bearing member and an electric motor element for driving the rotary compression mechanism. A groove is provided on the circumference, and a communication boat is provided that communicates with the groove on the side surface of the lower end of the boss.

Effect of the present invention With the above-described configuration, when the lubricating oil that has finished lubrication is released from the tip of the upper bearing, the lubricating oil is collected in the groove provided in the boss part and falls down the communication boat due to its own weight. , flows quietly on the upper bearing. Therefore, the amount of lubricating oil that is stirred into a mist by the rotor of the rotating electric motor and discharged to the outside of the sealed container by the refrigerant gas is extremely small.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In Fig. 1, the 10-rotary compression mechanism is composed of a cylindrical member 11, a piston 12, and a crankshaft 13, and the crankshaft 1a is provided with an oil supply hole 14 for supplying lubricating oil to each sliding part. There is. Further, an upper bearing member 15 and a lower bearing member 16 that support the crankshaft 13 are provided so as to close the upper and lower end surfaces of the cylindrical member 11, and the upper and lower bearing members 15, 16 and the cylindrical member 11 form a cylinder portion 17. Configure. As shown in FIG. 2, the upper bearing member 15 is provided with a circular groove 18 on the axial end surface of the tip of the boss, and this groove 18 and the side surface of the lower end of the boss are communicated by a communication boat 19. ing. 2 (l) is an oil reservoir for lubricating oil provided at the inner bottom of the hermetic container 21. 22 is a refrigerant gas passage for the refrigerant gas compressed and discharged by the compression mechanism 10, and 23 is a refrigerant gas passage for the refrigerant gas compressed and discharged by the compression mechanism 10. This is an upper space from which refrigerant gas is discharged to the outside of the closed container 21 through the discharge pipe 24. configured.

The operation of the hermetic compressor configured as described above will be described below.

As the crankshaft 13 is rotated by the rotation of the electric motor element 25, the lubricating oil in the oil reservoir 20 is transferred to the oil supply hole 14.
It is sucked up and lubricates each sliding part. The lubricating oil that has completed this lubrication is discharged from the upper end of the upper bearing member 15.

At this time, since a groove 18 is provided circumferentially on the axial end surface of the upper end of the boss, the lubricating oil that has been lubed is temporarily stored in this groove 18, and is transferred to the communication boat by its own weight.
9 and flows quietly onto the upper surface of the upper bearing member 15. Therefore, the lubricating oil released from the upper end of the upper bearing member 15
The high-speed refrigerant gas is made into a mist by the rotation of the rotor 27 and discharged by the high-speed rotation of the rotary compression mechanism 1o, and is discharged to the outside of the closed container 21 through the refrigerant gas passage 22, the upper space 23, and the discharge pipe 24. The amount of lubricant used will decrease.

As described above, according to this embodiment, there is a cylinder section formed by a top and bottom bearing member provided on a cylindrical member so as to close the top and bottom end surfaces of this cylindrical member, and a rotary compression mechanism provided inside this cylinder section. and a second electric motor element for driving the rotary compression mechanism, a groove is provided circumferentially on the axial end surface of the tip of the boss of the upper bearing member, and the groove is connected to a side surface of the lower end of the boss. By providing a communicating boat, the amount of lubricating oil discharged to the outside of the closed container 21 by compressed refrigerant gas is significantly reduced, and the reduction in reliability of each sliding part is avoided, and the effects of the refrigeration cycle invention are improved. As described above, the present invention provides a cylinder section formed by a cylindrical member and upper and lower bearing members provided to close the upper and lower end surfaces of the cylindrical member, a rotary compression mechanism provided within the cylinder section, and a rotary compression mechanism provided in the cylinder section. an electric motor element for driving a rotary compression mechanism, a communication boat provided with a circumferential groove on the axial end surface of the tip of the boss portion of the upper bearing member, and communicating with the groove and a side surface of the lower end of the boss; As a result, the amount of lubricating oil discharged into the upper space of the closed container or to the outside of the closed container is significantly reduced, and the reliability of the compressor is not reduced. In addition, the heat transfer coefficient on the refrigerant side of the evaporator is prevented from decreasing due to the lubricating oil when forming the refrigeration cycle, and the refrigeration capacity is also prevented from decreasing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hermetic compressor according to an embodiment of the present invention, and FIG. 2 is an enlarged plan view of essential parts of the hermetic compressor of the present invention.
FIG. 3 is a longitudinal sectional view showing a conventional hermetic compressor. 10... Rotating compression mechanism, 11... Cylindrical member, 15... Upper bearing member, 16...
Lower bearing member, 17...Cylinder part, 18...
...Groove, 19...Connection boat, 25...
...Electric motor element. Name of agent: Patent attorney Toshio Nakao and one other person lδ
・Lower bearing! y# 17...Cylinder part 1st! 1 Figure 2 Figure 3

Claims (1)

[Claims] A cylinder portion formed by a cylindrical member, and upper and lower bearing members that are provided so as to close the upper and lower end surfaces of the cylindrical member and support a crankshaft, a rotary compression mechanism provided within the cylinder portion, and the rotary compression mechanism. A groove is provided on the circumference of the axial end surface of the tip of the boss formed in the center of the upper bearing member, and the groove communicates with the side surface of the lower end of the boss. A hermetic compressor with a communication port.