JPH0133837Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a rotary compressor, and in particular improves the restartability of the rotary compressor by promoting pressure balance after the rotary compressor is stopped. It is related to.

[Conventional technology]

Generally, this type of compressor is incorporated into a refrigerant circuit of a refrigeration or cooling system, and is operated intermittently by a temperature controller.

This compressor is constructed as shown in FIGS. 1 and 2. That is, the electric element 2 and the compression element 3 are housed inside the closed container 1, and the lubricating oil 4 is stored in the inner bottom thereof.

Reference numeral 5 denotes a cylinder, which has a rotary piston 6 therein, and has a structure in which a vane 7 that contacts the outer peripheral surface of the rotary piston 6 reciprocates in a groove 5a provided in the cylinder. Further, this cylinder has a main bearing 8 and an end bearing 9 on both end faces, thereby forming a compression element 3.

The efficiency of a conventional compressor depends on the clearance between the sliding parts constituting the compression element 3 as described above, such as the vane 7 and the groove 5a, the end face of the vane 7 and the main bearing 8 and the end bearing 9, and the rotating piston. 6 and the inner circumference 5b of the cylinder 5 to minimize the leakage of the compressed refrigerant, and at the same time, the cylinder 5 of the compression element 3 is immersed in lubricating oil 4 to lubricate the sliding clearance part. By supplying oil, the sealing effect against leakage is enhanced.

[The problem that the idea aims to solve]

Conventional rotary compressors are configured as described above, so that the compression element, which has been designed to improve sealing effect and achieve high efficiency, maintains a high-pressure side to a low-pressure side inside the compression element even after its operation is stopped. The leakage of refrigerant or lubricating oil to the compressor is extremely small, making it difficult to maintain a balance between high and low pressures while the compressor is stopped.

Then, the torque required for restarting increases, a high-output electric element is required, and the efficiency of the electric element during steady operation decreases.

To deal with this, either the sliding clearances described above can be expanded to balance high and low pressures, or the oil level of the lubricating oil can be positioned in the middle of the cylinder to reduce the sealing effect of the lubricating oil by half, thereby reducing high and low pressures. Although methods for achieving balance have been proposed, each method has the drawback of reducing the efficiency of the compression element.

This idea was made to eliminate these drawbacks, and provides a rotary compressor that minimizes the leakage of compressed refrigerant when the compressor is in steady operation, and that can easily maintain a balance between high and low pressures when the compressor is stopped. The purpose is to

[Means to solve the problem]

In the rotary compressor according to this invention, a small communication hole for pressure balance is passed through the bearing flange surface so that the suction side wall surface of the vane groove of the cylinder communicates with the inside of the discharge muffler, and an oil separation member is inserted inside the discharge muffler. Then, the other end of the communicating small hole is opened into the separated oil.

[Effect]

In the rotary compressor of this invention, when the compressor is stopped, the flow of discharge gas stops, so oil is not supplied into the discharge muffler, and high-pressure gas is compressed in the cylinder through the communication small hole, through the vane groove suction side wall clearance. It flows into the chamber suction side, that is, the low pressure side, and pressure balance is quickly achieved.

[Example of idea]

This invention will be explained below with reference to illustrated embodiments.
In the drawings, parts that are the same as or equivalent to those in the prior art are given the same reference numerals and their explanations will be omitted.

Reference numeral 8a denotes a flange portion of the main bearing 8 constituting the compression element 3. A discharge hole 11 having a discharge valve device 10 is provided in this flange portion, and a discharge muffler 12 is attached so as to surround the entire flange portion 8a of the main bearing. ing.

Then, an oil separation member (not shown) such as a spongy metal is inserted into the discharge muffler 12.
Improves the oil separation effect of lubricating oil contained in discharged gas. Reference numeral 13 denotes a communicating small hole passing through the flange portion 8a, with one end opening at a position substantially coinciding with the suction side wall surface 7a of the vane of the vane groove 5a and near the outer circumference 8b of the flange portion, and the other end opening toward the discharge muffler. It opens in the oil separated by the oil separation member in 12.

Therefore, when the rotary compressor is stopped, the high pressure discharged refrigerant gas in the discharge muffler 12 flows through the communication small hole 13 of the flange portion 8a, the clearance _C1 between the vane 7 and the vane groove 5a of the cylinder, and the end surface of the vane 7. The suction chamber 14 in the cylinder 5 through the clearance _C2 between the flange portion 8a of the main bearing and the
In other words, the balance between high and low pressure is promoted by flowing into the low pressure chamber.

Furthermore, during operation of the compressor, when the lubricating oil contained in the refrigerant gas discharged from the compression chamber is discharged from the discharge valve device 10, it is separated by the oil separation member in the discharge muffler 12. The lubricating oil is supplied to the clearances C ₁ and C ₂ through the communication small hole 13 opened in the flange portion 8a.
This lubricating oil provides a sealing effect.

[Effect of idea]

As described above, according to this invention, a small communication hole for pressure balance is provided in the main bearing flange so that the suction side wall surface of the vane groove of the cylinder communicates with the inside of the discharge muffler, and an oil separation member is inserted into the discharge muffler. Since the communicating small hole is opened in the oil separated by the above, each of the above-mentioned clearances is made as small as possible, and the entire cylinder is immersed in the lubricating oil to enhance the sealing effect of the lubricating oil. , the balance between high and low pressure can be easily promoted when the system is stopped. This increases the efficiency of the compression element,
Moreover, it becomes possible to increase the efficiency of the electric element.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the rotary compressor, and Figure 2 is a cross-sectional view of the rotary compressor.
3 is a sectional view of the rotary compressor according to this invention corresponding to FIG. 2, FIG. 4 is an enlarged sectional view of the main part of FIG. 3, and FIG. It is a sectional view taken along the - line. In addition, in the figures, the same reference numerals indicate the same or equivalent parts, 1 is a closed container, 3 is a compression element, 4 is lubricating oil, 5 is a cylinder, 5a is a groove, 6 is a rotating piston, 7 is a vane, and 7a is a suction On the side wall surface, 8 and 9 are bearings, 8a is a flange portion of the bearing, 12 is a discharge muffler, and 13 is a communicating small hole.

Claims (1)

[Scope of utility model registration request] It has a rotating piston that eccentrically rotates inside the cylinder, a vane that comes into contact with the outer periphery of the rotating piston and slides back and forth in a groove provided in the cylinder, and both end surfaces of the cylinder are closed by respective flanges. A compression element consisting of a main shaft and an end bearing forming a cylinder chamber, and a rotary compressor in which this compression element is housed in a closed container and lubricating oil is stored in the inner bottom of the container, the discharge valve device of the bearing is a flange portion having a flange portion, a discharge muffler provided to surround the flange portion, an oil separation member inserted into the discharge muffler, one end of which is open to the suction side wall surface of the vane groove provided in the cylinder, and the other end of which is connected to the oil separation member. A closed type rotary compressor, characterized in that a small communicating hole is provided through the flange portion and opens into oil separated by a separating member.