JP2001289171A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a refrigerant compressor having a displacement type oil pump preventing decreasing of a supply amount of oil even when an oil level exists in a strainer part by an inflow of refrigerant gas in a shell, to cool refrigerating machine oil accumulated in the shell, generate high viscosity, decrease the amount of oil, and lower down the oil level. SOLUTION: This refrigerant compressor, comprising an oil pipe provided in a displacement type oil pump to serve as a suction path for refrigerating machine oil, a bulk-shaped strainer provided in the periphery including a suction port of the oil pipe in the vicinity of the displacement type oil pump, and an outer cylinder provided in an external periphery of the strainer to be made adhesion to the displacement type oil pump to be extended to a height of the suction port of the oil pipe, is constituted by suppressing suction of refrigerant gas from an upper part of the strainer by the displacement type oil pump even when a level of the refrigerating machine oil exists in a strainer part by decreasing in the amount of the refrigerating machine oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor mounted on an air conditioner, a refrigerator or the like.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a cross-sectional view of a hermetic scroll compressor disclosed in Japanese Unexamined Patent Publication (Kokai) No. H10-15095. In the figure, 1 is a compression mechanism having a fixed scroll 2 and an orbiting scroll 3, 4 is an electric mechanism having a stator 5 and a rotor 6, 7 is a spindle driven by the electric mechanism 4, 8 Is a sealed shell that houses the compression mechanism 1 and the electric mechanism 4, 9 is a refrigerant gas suction pipe,
10 is a discharge pipe for compressed refrigerant gas, 11 is a sealed terminal welded to the shell 8 to take out the power line of the stator 5 and the connection line of the thermal protector to the outside of the shell 8, 12
Is a positive displacement oil pump, 13 is a bulk strainer having a large volume installed on the outer periphery of the positive displacement oil pump 12, 14 is an oil pipe of the positive displacement oil pump 12, 25 is a refrigerating machine oil stored at the bottom of the shell 8. It is.

Next, the operation will be described. Sealed terminal 11
When the motor is energized, the electric mechanism 4 generates torque and the main shaft 7
Rotates. As a result, the orbiting scroll 3 connected to the main shaft 7 starts rotating, and the fluid gas starts to compress in cooperation with the fixed scroll 2 according to the well-known compression principle of a scroll compressor. At this time, the fluid gas is sucked from the suction pipe 9 and flows into the shell 8, and then is sucked into the compression mechanism 1 constituted by the fixed scroll 2 and the orbiting scroll 3, and is compressed by the above-described compression theory. Is discharged out of the shell 8 through the discharge pipe 10.

[0004] A refrigerating machine oil 25 at the bottom of the shell 8 is provided.
Is sucked by the positive displacement oil pump 12 when the main shaft 7 rotates, passes through the strainer 13, passes through an oil supply passage provided in the main shaft 7 from the oil pipe 14, and is lubricated and lubricated to each bearing and the like. Return to the bottom of 8. The strainer 13 is a filter installed on the outer periphery of the positive displacement oil pump 12 and prevents foreign substances from entering the positive displacement oil pump 12.

[0005]

The conventional refrigerant compressor is:
With the above-described configuration, the refrigerant gas flowing into the shell 8 cools the refrigerating machine oil 25 accumulated in the shell 8 to have a high viscosity, and the amount of oil decreases, and the oil level is reduced to the strainer 13. Is present, the resistance when the refrigerating machine oil 25 passes through the strainer 13 increases, so that the positive displacement oil pump 12 sucks more refrigerant gas from the upper portion of the strainer 13, and thus the amount of oil supplied to the positive displacement oil pump 12 To deteriorate the lubrication characteristics of the bearing.

Further, when foreign matter enters the positive displacement oil pump 12, the positive displacement oil pump 12 is damaged.
However, the strainer 13 needs a filter having a large area that does not cause clogging due to accumulation of foreign matters and deteriorate the oil supply characteristics.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the refrigerant gas flowing into the shell cools the refrigerating machine oil deposited in the shell to have a high viscosity. It is an object of the present invention to obtain a refrigerant compressor having a positive displacement oil pump in which the amount of refueling does not decrease even if the amount of oil decreases and the level of oil drops and the level of oil is present in the strainer section.

[0008]

A refrigerant compressor according to the present invention accommodates a compression mechanism and an electric mechanism in a shell,
In a refrigerant compressor having a positive displacement oil pump that supplies oil to a compression mechanism portion, an oil pipe provided in the positive displacement oil pump and serving as a suction path for refrigerating machine oil, and an inlet of the oil pipe near the positive displacement oil pump And a bulky strainer provided on the periphery of the strainer, and an outer cylinder provided on the outer periphery of the strainer and in close contact with the positive displacement oil pump and extending to the height of the inlet of the oil pipe. Thus, even if a refrigerator oil level exists in the strainer section, the displacement type oil pump is configured to suppress suction of the refrigerant gas from the upper part of the strainer.

Also, in a refrigerant compressor having a displacement type oil pump for housing a compression mechanism and an electric mechanism in a shell and supplying oil to the compression mechanism, the refrigerant compressor is provided in the displacement type oil pump and sucks refrigerating machine oil. An oil pipe serving as a path, an expanded portion formed at an inlet of the oil pipe, and a bulk strainer provided inside the expanded portion of the oil pipe are provided.

The expanded portion of the oil pipe is formed in a trumpet shape.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the first embodiment, and is a partial cross-sectional view of a scroll compressor. The description of the same parts as in FIG. 3 described in the related art is omitted. In FIG. 1, reference numeral 21 denotes a positive displacement oil pump 12 on the outer periphery of a strainer 22 of the positive displacement oil pump 12.
And an outer cylinder installed in close contact with the oil pipe 14 to the height of the suction port. The strainer 22 is installed on the outer periphery of the positive displacement oil pump 12 and is a bulk type having a volume so that the area is as large as possible.

The outer cylinder 21 installed on the outer periphery of the strainer 22 of the positive displacement oil pump 12 is installed in close contact with the positive displacement oil pump 12 and up to the suction port of the oil pipe 14. Does not suck the refrigerant gas from the upper part of the strainer 22, the refrigerant gas flowing into the shell 8 cools the refrigerating machine oil 25 deposited in the shell 8 to have a high viscosity, the oil amount decreases, and the strainer 22
The displacement type oil pump 12 can suck only the refrigerating machine oil 25 from the lower part of the strainer 22 even if there is an oil level in the oil pump and the resistance of the refrigerating machine oil 25 passing through the strainer 22 increases.

According to the above-described embodiment, the outer cylinder 21 that is in close contact with the positive displacement oil pump 12 is installed on the outer periphery of the strainer 22 of the positive displacement oil pump 12 up to the height of the inlet of the oil pipe 14 so that the shell 8 The refrigerant gas flowing into the inside cools the refrigerating machine oil 25 accumulated in the shell 8 to have a high viscosity, the oil amount is reduced, the oil level is present on the strainer 22, and the refrigerating machine oil 25 passes through the strainer 22 Even if the resistance of the displacement becomes large, the displacement type oil pump 12 can prevent the refrigerant gas from being sucked from the upper part of the strainer 22, so that the oil supply characteristics of the displacement type oil pump 12 can be prevented from deteriorating.

Embodiment 2 FIG. Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows the second embodiment and is a partial cross-sectional view of the scroll compressor. In the first embodiment, the outer cylinder 21 is arranged on the outer periphery of the positive displacement oil pump 12 in close contact with the positive displacement oil pump 12, but as shown in FIG. The same effect as that of the first embodiment can be achieved even when the expanded portion 23 of the oil pipe is provided at the distal end and the strainer 24 is installed inside the expanded portion 23 of the oil pipe.

It is also effective to form the expanded portion 23 of the oil pipe in a trumpet shape to increase the area of the opening.

In the above embodiment, the scroll compressor has been described. However, the present invention is not limited to this.
It is applicable to other compressors.

An oil pump having a strainer is particularly effective in a refrigerant compressor used for refrigeration and refrigeration used in a region where the temperature of refrigerant oil at the bottom of the shell is low and the refrigerant gas temperature is low. It is effective in the used refrigerant compressor.

[0018]

In the refrigerant compressor according to the present invention, an outer cylinder closely contacting the positive displacement oil pump and extending to the height of the inlet of the oil pipe is provided on the outer periphery of the bulk strainer, so that the refrigerating machine oil amount is reduced. Even if the refrigerator oil level exists in the strainer part, the refrigerant gas flows into the shell and accumulates in the shell by suppressing the positive displacement oil pump from sucking the refrigerant gas from the upper part of the strainer. Even if the refrigerating machine oil is cooled to a high viscosity, the amount of oil decreases and the oil level is present in the strainer section, and even if the resistance of the refrigerating machine oil passing through the strainer increases, the oil supply characteristics of the positive displacement oil pump deteriorate. And a highly reliable refrigerant compressor can be obtained.

A similar effect can be obtained by forming an expanded portion at the inlet of the oil pipe and providing a bulk strainer inside the expanded portion of the oil pipe.

[Brief description of the drawings]

FIG. 1 shows the first embodiment, and is a partial cross-sectional view showing a scroll compressor.

FIG. 2 is a view showing a second embodiment and is a partial cross-sectional view showing a scroll compressor.

FIG. 3 is a sectional view showing a conventional scroll compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compression mechanism part, 2 fixed scrolls, 3 oscillating scrolls, 4 electric mechanism parts, 5 stators, 6 rotors, 7
Main shaft, 8 shells, 9 suction pipe, 10 discharge pipe, 11
Sealed terminal, 12 displacement oil pump, 13 strainer,
14 oil pipe, 21 outer cylinder, 22 strainer,
23 oil pipe, 24 strainer, 25 refrigeration oil.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yusuke Shimazu 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Kenji Yano 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 F term in Ryo Denki Co., Ltd. (reference) 3H003 AA05 AB03 AC03 BD03 BD07 BD13

Claims (3)

[Claims] 1. A refrigerant compressor having a positive displacement oil pump that accommodates a compression mechanism portion and an electric mechanism portion in a shell and supplies oil to the compression mechanism portion, wherein the refrigerating machine oil is provided on the positive displacement oil pump. An oil pipe serving as a suction path of the oil pump; a bulk strainer provided around the oil pipe in the vicinity of the positive displacement oil pump, including a suction port of the oil pipe; and a positive displacement oil pump provided on an outer periphery of the strainer. An outer cylinder which is in close contact with the oil pipe and extends to the height of the suction port of the oil pipe. Even if the amount of the refrigerating machine oil is reduced and the refrigerating machine oil level is present in the strainer portion, the positive displacement oil pump is disposed above the strainer. A refrigerant compressor characterized in that suction of refrigerant gas is further suppressed. 2. A refrigerant compressor having a positive displacement oil pump that accommodates a compression mechanism and an electric mechanism within a shell and supplies oil to the compression mechanism, wherein the positive displacement oil pump is provided on the positive displacement oil pump. A refrigerant pipe comprising: an oil pipe serving as a suction passage of the oil pipe; an expanded portion formed at an inlet of the oil pipe; and a bulk strainer provided inside the expanded portion of the oil pipe. Compressor. 3. The refrigerant compressor according to claim 2, wherein the expanded portion of the oil pipe is formed in a trumpet shape.