JPH0719191A - Rotary compressor - Google Patents

Abstract

PURPOSE:To provide a rotary compressor used for a refrigerating device of a refrigerator or the like and prevented from the wear of sliding parts in a compression element by liquid return generated by the load fluctuation of the refrigerating device. CONSTITUTION:A rotary compressor is formed of a closed container 1, a motor- driven element 4 enclosed in the closed container 1, a compression element 5, lubricating oil 6 accumulated at the bottom part of the closed container l, and a feed oil pipe 31 with trap shape 31a formed, piercing the closed container 1 so as to be press-fitted into a through hole 1 leading to the compression chamber 10 of a cylinder 7 provided at an auxiliary side housing 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used in a refrigerating device such as a refrigerator.

[0002]

2. Description of the Related Art A conventional compressor will be described below with reference to the drawings. FIG. 6 is a sectional view of a horizontal rotary compressor disclosed in Japanese Patent Laid-Open No. 62-13095, and FIG. 7 is a piping diagram of a refrigeration system to which the horizontal rotary compressor is applied.

Reference numeral 1 is a substantially cylindrical closed container which is long in the lateral direction,
An electric element 4 including a stator 2 and a rotor 3 and a compression element 5 driven by the electric element 4 are housed. Lubricating oil 6 is accumulated below the closed container 1.

The compression element comprises a cylinder 7, a main side housing 8 and a sub side housing 9, which form a compression chamber 10 which is in close contact with both sides of the cylinder 7. Reference numeral 14 is a crankshaft connected to the rotor 3 and has an eccentric portion 15. 1
Reference numeral 1 denotes a roller fitted in the eccentric portion 15, which is inscribed in the compression chamber 10. A vane 12 is pressed against the roller 11 by a spring 13 to keep the compression chamber 10 at a high and low pressure. Reference numeral 18 denotes an oil supply pipe, one end of which penetrates into the lubricating oil 6, and a coil spring 19 fixed to the crankshaft 14 is arranged inside. Reference numeral 20 is a discharge valve provided in the sub-side housing. Reference numeral 17 denotes a discharge cover, and the cup-shaped portion of the discharge cover 17 is formed as the discharge chamber 16.

The oil supply pipe 18 is integrated with the discharge cover 17, and is lightly press-fitted and fixed to the convex portion 9a of the auxiliary side housing 9. Reference numeral 21 is a suction pipe that penetrates the closed container 1 and is located above the lubricating oil 6 and is press-fitted into a through hole 17a that communicates with the compression chamber 10 of the cylinder 7 provided in the auxiliary side housing 9.

A condenser 23 is connected to the discharge pipe 22 and is sequentially connected in an annular shape by a capillary tube 24, an evaporator 25, and a connecting pipe 26 connecting the evaporator 25 and the suction pipe 21 to form a refrigeration system. .

Regarding the compressor configured as described above,
The operation will be described below. The rotation of the rotor 3 constituting the electric element 4 is transmitted to the crankshaft 14 and imparts a rotational motion to the roller fitted in the eccentric portion 15, so that the refrigerant sucked from the suction pipe 21 is compressed in the compression chamber 10. To do.

The rotation of the rotor 3 also gives a rotational motion to the coil spring 19 fixed to one end of the crankshaft 14, so that the lubricating oil 6 accumulated below the closed container 1 due to the centrifugal force of the rotation is transferred to the crankshaft. The oil is supplied to the compression element 5 by transferring it to the 14 side.

The refrigerant compressed in the compression chamber 10 is silenced by being discharged into the discharge chamber 16 from the discharge valve 20 provided in the auxiliary side housing 9, and is discharged from the discharge cover 17 into the closed container 1. . The discharged gas refrigerant is liquefied in the condenser 23 through the discharge pipe 22, is decompressed while passing through the capillary tube 24, is vaporized at a predetermined temperature in the evaporator 25, and is returned to the suction pipe 21 again. By repeating, the cooling action is continued.

[0010]

However, in the above-mentioned conventional structure, the suction pipe 21 is provided in the through hole 17a which is formed in the main side housing 8 and the sub side housing 9 so as to be in close contact with both sides of the cylinder 7 and communicates with the compression chamber 10. Depending on the refrigeration system to be applied, the load is large because it is press-fitted, the initial start-up during normal ON-OFF operation, or after defrosting to remove the frost adhering to the evaporator 25 during operation. The liquid refrigerant may return at the time of starting. In a general refrigeration system, the evaporator 25 and the suction pipe 2
Although an accumulator (not shown) is installed between No. 1 and 1, the liquid refrigerant is prevented from being sucked into the suction pipe 21, but it is difficult to completely prevent it. Therefore, the liquid refrigerant is directly sucked into the compression chamber 10 via the suction pipe 21,
The lubricating oil in the compression chamber 10 is washed with the liquid refrigerant, and the roller 1
However, there is a drawback that the sliding parts such as 1 and vanes 12 are worn and the performance is impaired.

An object of the present invention is to solve the above problems, and an object thereof is to provide a rotary compressor which does not cause abrasion of sliding parts in a compression element due to liquid refrigerant return caused by load fluctuation.

[0012]

In order to achieve this object, the rotary compressor of the present invention has a suction pipe press-fitted into a through hole communicating with the compression chamber of the cylinder in the form of a trap.

Further, a part of the trap shape is immersed in the lubricating oil accumulated at the bottom of the closed container.

Further, a part of the trap shape is immersed in the lubricating oil accumulated at the bottom of the closed container, and a filter is provided on the inner surface of the suction pipe in the immersed portion.

Further, the inner surface of the suction pipe is constructed as a grooved pipe.

[0016]

According to the present invention, as described above, the suction pipe is formed into a trap shape, the liquid refrigerant is taken in, and the high temperature in the closed container is utilized to evaporate the lubricating oil before it is communicated into the compression chamber. It is possible to prevent the drawback that the sliding parts are abraded and the performance is impaired by being washed with a refrigerant.

Further, since a part of the trap shape is immersed in the lubricating oil accumulated at the bottom of the closed container, a larger liquid refrigerant evaporation effect can be obtained.

Further, since a part of the trap shape is dipped in the lubricating oil accumulated at the bottom of the closed container and the filter is provided inside the suction pipe of the immersed portion, the liquid refrigerant evaporation effect is further enhanced.

Further, the inner surface of the suction pipe is used as a grooved pipe to hold the liquid refrigerant in the groove, so that the degree of superheat of the refrigerant is not increased more than necessary, that is, the decrease in efficiency during normal operation is minimized. , Has a liquid refrigerant evaporation effect.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the rotary compressor according to the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the conventional one are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a sectional view of a rotary compressor according to a first embodiment of the present invention. FIG. 2 is a refrigeration cycle piping diagram to which the rotary compressor of the same embodiment is applied.

Reference numeral 31 is a suction pipe, and the main side housing 8 and the sub side housing 9 in the closed container 1 form the cylinder 7
Through hole 1 communicating with compression chamber 10 formed on both sides of
The trap shape 31a is formed until it is pressed into the 7a.

The operation will be described below. The refrigerant compressed in the compression chamber 10 is silenced by being discharged into the discharge chamber 16 from the discharge valve 20 provided in the sub-side housing 9, and is sealed by the discharge cover 17 from the closed container 1.
Is released into. The discharged gas refrigerant is liquefied in the condenser 23 through the discharge pipe 22, is decompressed while passing through the capillary tube 24, is vaporized at a predetermined temperature in the evaporator 25, and is returned to the suction pipe 31 again. By repeating, the cooling action is continued.

When the load fluctuation is large, or when the normal ON-O
At the beginning of start-up during FF operation, or after start-up after defrosting to remove frost adhering to the evaporator 25 during operation,
When the liquid refrigerant returns to the suction pipe 31, the trap shape 3
It is supplemented in 1a and evaporated in this part. still,
In the drawings, the U-shaped trap shape has been described,
It goes without saying that the same effect is exhibited even with a loop-shaped trap shape.

As described above, the rotary compressor of the present embodiment includes the closed container, the electric element housed in the closed container, the compression element, the lubricating oil accumulated at the bottom of the closed container, and the closed container. The compression chamber 1 has a suction pipe press-fitted into a through hole that penetrates and communicates with a compression chamber of a cylinder provided in the sub-side housing, and the suction pipe has a trap shape.
This is to prevent the liquid from returning to 0.

Next, a second embodiment of the rotary compressor according to the present invention will be described with reference to the drawings.

FIG. 3 is a sectional view of a rotary compressor according to a second embodiment of the present invention. In FIG. 3, 41 is a suction pipe and 41a is a trap shape. A part of 41a is immersed in a part of the lubricating oil 6 accumulated at the bottom of the closed container 1. As a result, the suction pipe 41 is affected by the heat of the lubricating oil, so that the liquid refrigerant evaporating ability with respect to the liquid return is improved.

Next, a third embodiment of the rotary compressor according to the present invention will be described with reference to the drawings.

FIG. 4 is a sectional view of a rotary compressor according to a third embodiment of the present invention. In FIG. 4, 51 is a suction pipe, and 51a is a trap shape. A part of 51a is immersed in a part of the lubricating oil 6 accumulated at the bottom of the closed container 1, and a filter 52 made of a metal mesh of about 150 mesh is provided inside the suction pipe of the immersion part. There is. This increases the heat receiving area inside the suction pipe 51, and has a further liquid refrigerant evaporation effect.

FIG. 5 is a sectional view of a rotary compressor according to a fourth embodiment of the present invention. In FIG. 5, reference numeral 61 is a suction pipe, and the inside of the oil supply pipe 61 is a grooved pipe 61a.
This makes it possible to hold the liquid refrigerant in the groove and easily receive heat,
It is intended to promote evaporation.

[0031]

As described above, according to the present invention, the hermetic container, the electric element housed in the hermetic container, the lubricating oil accumulated at the bottom of the hermetic container, and the auxiliary side housing penetrating the hermetic container. Since the rotary compressor is equipped with the suction pipe press-fitted into the through hole that communicates with the compression chamber of the provided cylinder, and the suction pipe is configured as a trap shape, the liquid return to the compression chamber can be prevented and the lubrication of the compression chamber It is possible to eliminate the drawback that the oil is washed with the liquid refrigerant, wears the sliding parts of the rollers and vanes, and impairs the performance of the compressor.

Further, by immersing a part of the trap shape of the suction pipe in the lubricating oil accumulated at the bottom of the closed container,
The suction pipe is affected by the heat of the lubricating oil, and the liquid refrigerant vaporization capacity for liquid return is improved.

Further, according to the present invention, a part of the trap shape of the suction pipe is immersed in the lubricating oil accumulated at the bottom of the closed container, and a filter is provided inside the suction pipe of the immersed portion, so that the inside of the suction pipe is The heat-receiving area is increased and the liquid-refrigerant evaporation effect is further increased, so that it is possible to cope with a larger load change.

Further, since the inner surface of the suction pipe is a grooved pipe, the liquid refrigerant is held in the groove portion so as to easily receive heat, promote evaporation, and minimize overheating of the liquid refrigerant. In addition, it has an effect of minimizing the decrease in efficiency during normal operation without increasing the degree of superheat of the refrigerant.

[Brief description of drawings]

FIG. 1 is a first sectional view of a rotary compressor according to the present invention.

FIG. 2 is a refrigeration cycle diagram to which the rotary compressor of the same embodiment is applied.

FIG. 3 is a second sectional view of the rotary compressor according to the present invention.

FIG. 4 is a third sectional view of the rotary compressor according to the present invention.

FIG. 5 is a fourth sectional view of the rotary compressor according to the present invention.

FIG. 6 is a sectional view of a conventional rotary compressor.

FIG. 7 is a refrigeration cycle diagram to which a conventional rotary compressor is applied.

[Explanation of symbols]

 1 Airtight Container 4 Electric Element 5 Compression Element 6 Lubricating Oil 7 Cylinder 9 Sub Side Housing 10 Compression Chamber 17a Through Hole 31 Intake Pipe 31a Trap Shape 41 Intake Pipe 41a Trap Shape 51 Intake Pipe 51a Trap Shape 52 Filter 61 Intake Pipe 61a With Groove tube

Claims (4)

[Claims] 1. A hermetically sealed container, an electric element housed in the hermetically sealed container, a compression element, lubricating oil collected at the bottom of the hermetically sealed container, and a cylinder provided in an auxiliary side housing penetrating the hermetically sealed container. A rotary compressor having a suction pipe press-fitted into a through hole communicating with the compression chamber, the suction pipe having a trap shape. 2. The rotary compressor according to claim 1, wherein a part of the trap shape of the suction pipe is immersed in the lubricating oil accumulated at the bottom of the closed container. 3. The rotary compressor according to claim 1, wherein a part of the trap shape of the suction pipe is immersed in the lubricating oil accumulated at the bottom of the closed container, and a filter is provided inside the suction pipe of the immersed portion. 4. The rotary compressor according to claim 1, wherein the inner surface of the suction pipe is a grooved pipe.