JPS6053691A - Closed type screw compressor - Google Patents

Abstract

PURPOSE:To surely lubricate required parts and as well to make it possible to remove fine oil splashes, effectively with the use of an oil separating element, by utilizing the head of an oil sump to effect the lubrication, and as well by utilizing a centrifugal separating disc for separating large size oil particles before they reach the oil separating element. CONSTITUTION:Large size oil particles 48 which are collided against a centrifugal separating disc 30 are spattered onto a motor cover 22 from an oil separating hole 31, dropping along the inner wall of the motor cover 22, and then is returned to an oil sump 40 through an oil downpipe 23. Further, oil which is collided against the top end of a motor housing 16 and is separated drops into the oil sump 40 from an oil bleed hole 21. Gas 43 from which large size oil particles are separated, comes through the lower end of the motor cover 22, then comes up, passing through an oil separating element 12, and is discharged from a gas discharge hole 49. Upon this passage through the oil separating element 12 fine oil splashes in the gas may be effectively removed, and as well due to the head of the oil sump 40 lubrication oil is surely supplied to required parts from an oil feed passage 36.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic screw compressor used in refrigerators, air conditioners, etc.

In compressors used in refrigerators and the like, the screw compressor and its drive motor are housed in a closed container for the purpose of noise reduction and compactness.

In such a compressor, lubricating oil for the motor and compressor is also sealed in a sealed container.

Therefore, the motor bearing and compressor of a hermetic screw compressor are lubricated using the operation of the motor and compressor, and the quality of lubrication greatly depends on the structure. In addition, the working fluid compressed by the compressor will be mixed with fine oil droplets, but if the working fluid is a refrigerant such as Freon, the refrigerant will be absorbed by the oil, so the compression will be difficult. Before the compressed working fluid is discharged from the compressor, the f11 fluid must be separated.

Figure 1 shows a conventional hermetic screw compressor, in which a motor 2 and a screw compressor 3 are integrated and fitted in a hermetic compressor 1. 4 and connects the compressor 3 with the rotor 2.
N13 is rotatably supported by a bearing portion 6 of the casing 4.

The oil stored at the bottom of the closed container 1 is sucked up from the oil passage 7 etc. by the differential pressure inside the closed container 1 generated by the operation of the compressor 3, and lubricates the compressor 3 and the bearing section 6.

The compression IXII 3 is operated by the rotation of the motor 2, and the working fluid 9 is sucked 4- through the suction port 8. The working fluid 9 passes through the gap in the motor 2 and is compressed (to a point 3), passes through the space 10 formed around the casing 4, and enters the discharge port 11.
more excreted. During the process of passing through the compressor 3, fine droplets of oil are mixed in the working fluid, but these droplets are separated by an oil separation element 12 provided in the space 10.

On the other hand, in the conventional example described above, oil lubrication is performed by differential pressure, so sufficient lubrication is not achieved while the compressor 3 is not operating, and effective lubrication is not provided for the bearing portion 6 where a pressure difference does not clearly occur. I can't hope for that. Furthermore, in this conventional example, the splashing of J oil is performed only by the oil pre-element, and depending on the load condition, sufficient oil separation may not be possible.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a hermetic compressor that can reliably and effectively lubricate oil and can efficiently separate oil droplets. be.

The present invention will be described in detail below with reference to the drawings.

As shown in the figure, the casing 13 is composed of an upper body 14 and an upper body 15, and the upper body 14 includes a motor housing 16 and an outer cylinder 17, and a flange 18 is fixed to the lower ends of both to close the motor housing 1G and the outer cylinder 17. .

A bearing portion 19 is provided at the center of the flange 18 . The upper end of the motor housing 16 is bent inward, a stator 20 is fitted into the narrow diameter part, and an oil drain hole 21 is bored near the stator upper terminal of the motor housing 16. The motor cover 22 is installed so as to cover the upper part of the motor housing 1G. Fold the ``F'' edge of the motor cover 22 toward the side, and drill a hole at a desired position on this folded line to open the eye hole. The oil upstream pipe 23 is connected to the oil upstream pipe 23.

Further, an oil separation element 12 is provided between the outer cylinder 17 and the motor cover 22.

The F section body 15 includes a cylindrical leg 24 and a compressor housing 25, and the compressor housing 25 houses a screw 26, which is a moving body of the compression engine 1, and its rotating shaft 27 is connected to the bearing section 19.
A rotor 29 is fitted to the part extending from the bearing part 28 through a bearing 28, and a motor 2 is constituted by the stator 20. .

The circumference if of the centrifugal #l disk 30 is folded downward, and an oil separation hole 31 is bored at a key position 7' of the folding line.

The lower rotating shaft of the screw 26? 7' is supported by a radial bearing 32 and a balance piston type thrust bearing 33.

The motor housing 16 and the cylinder 17. A lubricating oil distribution chamber 35 is located at the lower part of the cylindrical space 24 formed between the
The distribution chamber 35 and the bearing 28 are connected to an oil supply path 36.
It communicates with, and also distributes '[3: Distribution pipe 3 hanging down from +
7, one branch pipe 38 is connected to the screw 2C, and the other branch pipe 39 is connected to the bearing 32 and the thrust bearing 33.

The cylindrical space 34 stores lubricating oil to a required level to form an oil reservoir 40, and the distribution chamber 3 is formed in the oil reservoir 4o.
5) 1-1 - Install the valve 41 so that the valve hole 42 drilled in the ceiling of the distribution chamber 35 is opened according to the level of the oil sump 40.

The gas 43 sucked into the screw 26 is passed through the outer cylinder 17 through the shell to the flange 18, an additional upper suction pipe 44, and a lower suction pipe 45, which is connected to the suction pipe 44 and reaches the screw 26F. It is guided to the screw 26 from the outside. Further, the gas compressed by the screw 26 is discharged into the motor housing 16 through a discharge hole 41 penetrating the flange 18.

Reference numeral 4G is a communication passage, which communicates the thrust i with the lower suction cup 45 of the bearing 33, thereby resolving the force exerted on the thrust 1 due to the gas pressure difference.

The cylinder 111JI24 is shaped so that it protects the compressor housing 25 and the like and can be installed at a desired position.

Next, the operation of the above embodiment will be explained.

When the motor 2 is energized and the screw 2G is driven, the waste is sucked through the upper and lower suction pipes 44, 45, compressed by the screw 2G, and discharged through the discharge hole 47 into the housing 16. The discharged gas 43 passes through gaps between the motor housing 16 and the stator 20, and between the stator 20 and the rotor 29, cools the motor 2, and is discharged upward and collides with the centrifugal separator 30.

The large-diameter oil sludge 48 that collides with the centrifugal separator 30 and separates is shaken off from the oil separation hole 31 to the motor cover 22 by the rotation of the centrifugal separator 30, and the oil sludge 48 grows and falls along the inner wall. , returns to the oil sump 40 through the oil downstream pipe 23. Further, the oil scum that collides with and is separated from the toe end of the motor housing 16 falls into the oil [40] through the oil drain hole 21.

The gas 43 from which the large-diameter oil scum has been separated rises through the motor cover 22'F, passes through the oil separation element 12, and is discharged from the gas discharge port 49.

Fine oil droplets in the gas are separated when the gas passes through the oil separating niremen 812.

Further, lubrication to the bearing 28 is supplied from the distribution chamber 35 through the oil supply path 36 due to the head of the oil sump 40, and similarly, the screw 26,
The thrust bearing 33 is also supplied with oil.

When the tank 2 is stopped, the oil level in the oil reservoir 40 decreases because it is separated from the scum and there is no 1C return oil, but the valve hole 42 is closed by the float valve 41 and an excessive drop in oil is prevented. Ru.

As is clear from the above explanation, lubrication is performed by the drop from the oil sump 40 and is reliable, and since large-diameter oil scum in the gas is separated before reaching the oil separation element 12, the oil separation element 12 It can effectively remove minute oil droplets.

As described above, according to the present invention, required parts can be reliably lubricated with oil, and oil scum and oil droplets in gas can be effectively removed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a sectional view of an embodiment of the present invention. 2 is a motor, 3 is a Scrico compressor, 12 is an oil separation element, 1 is a motor housing, 22 is a motor cover, 2
5 is a compressor housing, 26 is a screw, 27 is a rotating shaft, 28 is a bearing, 30 is a centrifugal separator, 33 is a thrust bearing, 34 is a cylindrical space, 40 is an oil reservoir, and 49 is a gas discharge port. Patent application Person Ishikawajima Harima Jyuchogyo Co., Ltd.

Claims (1)

[Claims] 1) A motor housing is connected to the upper side of the screw compressor housing, the rotor of the motor is attached to the rotating shaft extending from the screw compressor, and a centrifugal front plate is fixed to the upper end, and the centrifugal separator is connected to the motor. Covered with a cover, and further provided with an outer cylinder having a discharge port at the top (1) A sealed cylindrical space is formed around the motor housing, an oil l1l11 element is provided in the upper part of the cylindrical space, and a lubricating oil element is provided in the lower part. This oil reservoir supplies lubricating oil to the bearing of the rotating shaft and the screw of the compressor, and at the same time discharges the gas from the compressor into the I-ta housing, and causes the gas to pass through the motor and oil separation element. (a) A hermetic screw compressor.