JPS6134385A - Enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the flow out of a lubricating oil into a refrigeration cycle by blocking the opening of a connecting passage which introduces a discharged gas from a discharging cover provided on the lower-part bearing of an enclosed rotary compressor to the upper part of a closed container, with an upper bearing, and laterally opening said connecting passage. CONSTITUTION:A gas compressed in a cylinder is introduced to a discharging chamber C in a discharging cover 10 provided on the lower part bearing 8 of a compressor. The gas in the discharging chamber is introduced to the upper part of a closed container via a connecting port 11'a, the outlet opening of which is blocked by an upper bearing 12, thereby, allowing the gas to flow out in the lateral direction. Accordingly, the efficiency of separating discharged gas from a lubricating oil can be improved reducing the flow out of the lubricating oil into a refrigeration cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hermetic rotary compressor used in refrigeration equipment and the like.

Structure of a conventional example and its problems In FIGS. 1 and 2, 1 is a closed container, inside which is a motor section A consisting of a stator 2 and a rotor 3, and a compressor section driven by the motor section A. B is placed □. The compressor section B includes a cylinder main body 4' forming a cylindrical cylinder 4, a roller 5 inside the cylinder 4, a crankshaft 6 in which an eccentric section 6a is rotatably inserted inside the roller 5, and It has an upper end plate 7 and a lower end plate 8 that close the upper and lower ends of the cylinder 4 and also serve as bearings for the crankshaft 6, and is fixed to the cylinder body 4' by bolts or the like. There is. The cylinder body 4' is also provided with a partition plate (not shown) that slides linearly to partition the inside of the cylinder 4 into a suction side and a compression side. ing. The crankshaft 6 is press-fitted into the rotor 3, and when the rotor 3 rotates, the crankshaft 6 also rotates, and the roller 5 also rotates along the inside of the cylinder 4 following the eccentric portion 6a of the crankshaft 6. . Further, the lower end plate 8 is provided with a 1-rotation device 9,
A metal discharge cover 10 is attached to temporarily store the compressed gas in the discharge space C outside the discharge device 9 during discharge, and separates it from the lubricating oil (not shown) in the lower part of the closed container 1. are doing. Furthermore, the lower end plate 8 niji, the ring body 4
' and the upper end plate 7 are formed with communicating passages 8b, 4'a, and 7a in the axial direction of the compressor.

When the compressor having the above structure is operated, gas enters the cylinder 4 and is surrounded by the inner wall of the cylinder 4, the roller 5, and a partition plate (not shown) as is well known.

Then, as the roller 5 rotates following the eccentric portion 6a of the crankshaft 6, the gas is compressed, and the discharge hole 8 of the lower end plate 8
a into the discharge space C consisting of the lower end plate 8 and the discharge cover 10 covering the outer surface of the lower end plate 8 through the discharge device 9, and the lower end plate 8, the cylinder body 4' and the upper end plate 7 in the axial direction of the compressor. The air is discharged into the upper space of the compressor through communicating passages 8b, 4'a, and 7a formed in the air.

However, in this structure, as shown in FIG.
The communication path 7a is located at the winding 2 of the stator 2 of the motor section A.
In many cases, the compressed gas in a high temperature state collides with the winding 2a at a considerable flow velocity, so the winding 2a
There is a risk that reliability may decrease due to temperature rise, etc. Further, a discharge cover '10 covering the outer surface of the lower end plate 8 separates the compressed gas from the lubricating oil (not shown) at the bottom of the closed container 1 to form a discharge space C. It is difficult to make a complete seal between the cover 10 and the lubricating oil enters the discharge space C, and the compressed gas and lubricating oil become a mixed gas and pass through the communication passages 8b, 4'a, and 7a. It was discharged into the upper space and flowed out of the pressure #I machine, causing problems such as a decrease in reliability due to a decrease in oil in the compressor and a decrease in the performance of the refrigeration system.

purpose of invention
1 The present invention solves these problems and provides a hermetic rotary compressor that improves reliability and performance by improving the reliability of the stator winding during compressor operation and reducing the amount of lubricant discharged within the compressor. The purpose is to provide

Structure of the Invention In order to achieve the above object, the present invention provides a communication path in the lower end plate and the cylinder body for guiding the compressed gas in the discharge space surrounded by the lower end plate and the discharge cover in the axial direction of the compressor. A communication groove or a communication hole is formed in the cylinder body and communicates with the communication path of the cylinder body and opens in the radial direction of the compressor, and the communication path is closed by an upper end plate.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Here, the same parts as in FIGS. 1 and 2 are given the same reference numerals, and the description thereof will be omitted.

In FIGS. 3 and 4, 11' is a cylinder body, and a cylindrical cylinder 11 is formed.

A communication passage 11'a is formed in the cylinder body 11' in the axial direction of the compressor and communicates with the communication passage 8b of the lower end plate 8. The communication passage 11'a communicates with the communication passage 11'a and opens in the radial direction of the compressor. A conductive groove 11'b is formed in the end face 11'd of the cylinder body, and the communicating passage 11'a is closed by the end face 12a of the upper end plate 12.

In the case of the compressor configured as described above, compressed gas enters the discharge space C, passes through communication passages 8b and 11'a formed in the axial direction of the compressor in the lower end plate 8 and the cylinder body 11',
The high-temperature, high-speed compressed gas discharged in the radial direction of the compressor through the conduction groove 11'b does not directly collide with the winding 2a of the stator 2, which reduces reliability due to temperature rise of the stator winding 2a. It can prevent sexual decline. In addition, since the compressed gas collides with the wall surface of the end surface 12a of the one-part end plate 12, the compressed gas that is in a mixed state containing lubricating oil can be separated into gas and lubricating oil, and the lubricating oil is discharged to the outside of the compressor. It is possible to improve the efficiency of the refrigeration equipment as well as to reduce the refrigeration system and improve reliability.

Moreover, FIG. 5 is a partial front view of a compressor in another embodiment of the present invention.

In FIG. 5, the communication passage 11'a of the cylinder body 11'
Even if a conductive hole 11'c is formed to be electrically connected to the conductive hole 11'c, the same effect as described above can be obtained.

Effects of the Invention As is clear from the above embodiments, the present invention provides a communication path in the lower end plate and the cylinder body that guides the compressed gas in the discharge space surrounded by the lower end plate and the discharge cover in the axial direction of the compressor. The structure is such that the cylinder body is formed with a conduction groove or hole that is open in the radial direction of the compressor, and the communication passage is closed with an upper end plate, so that the communication passage is connected to the communication passage of the cylinder body. without colliding directly with the stator windings,
Furthermore, since the lubricating oil and gas are actively separated, the amount of lubricating oil discharged from the compressor is reduced, making it possible to improve the reliability of the compressor and the performance of the refrigeration system. Furthermore, since it is only necessary to provide a conduction groove or a conduction hole in the cylinder body,
It has a simple structure and can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a conventional hermetic rotary compressor, Fig. 1 is a partial sectional view of the same compressor, and Fig. 3 is a section of a compressor showing an embodiment of the present invention. 4 is a plan view of the cylinder body of the same compressor, and FIG. 5 is a partial sectional view of a compressor showing another embodiment of the present invention. 1... Airtight container, 5... Roller, 6.
River...Crankshaft, 8...Lower end plate, 8b...
...Communication path, 9...Discharge device, 10...
...Discharge cover, 11...Cylinder, 11'
...Cylinder body, 11'a...mountain/communicating passage,
11'b...Conducting groove, 11'c...Conducting hole, 12...Middle/upper end plate, A...Motor section, C... discharge space. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4

Claims (1)

[Claims] An airtight container, a motor part housed and fixed in the airtight container, a roller driven by the motor part and a crankshaft, a cylinder body forming a cylinder that is a cylindrical cylinder, and a suction side and a compression side in the cylinder. a partition plate that partitions the cylinder, an upper end plate that closes the upper and lower ends of the cylinder and also serves as a bearing for the crankshaft, and a lower end plate that includes a discharge device; a discharge cover that forms a discharge space that temporarily stores compressed gas discharged from the discharge device, and further includes a communication path that guides the compressed gas in the discharge space in the axial direction of the compressor, in the lower end plate and the cylinder body. A hermetic rotary compressor, wherein a conduction groove or a conduction hole is formed in the cylinder body and is connected to a communication passage of the cylinder body and opened in the radial direction of the compressor, and the communication passage is closed with an upper end plate.