JPH11294350A - Closed type scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lubricated oil from being sucked in a scroll type compressor mechanism by fixing a separate plate covering an opening of a suction pipe to the inner surface of a closed housing, and forming a tonnel-shaped suction gas passage extending up and dot by the plate and the inner face of the housing. SOLUTION: To an inner surface of a closed housing 8, a separater plate 90 of a gutter shape to cover an opening 69 of a suction pipe 82 is fixed by means of a flange 91 at both side edges thereof, and with the plate 90 and the inner surface of the housing 8 a suction gas passage 93 of tunnel shape extending up and down is constructed. An upper end of the plate 90 is extended upward of a discharge oil passage 62 while its lower end slightly enters an oil passage 84. Accordingly, it is possible to prevent oil floating in a low pressure chamber 45 when oil leaked out to the chamber 45 from the passage 62 is stirred by a rotor Ma of a motor M from being sucked, together with gas, in a closed space 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic scroll compressor.

[0002]

2. Description of the Related Art An example of a conventional hermetic scroll compressor is shown in FIG. The interior of the closed housing 8 is partitioned by the discharge cover 31 into a high-pressure chamber 44 and a low-pressure chamber 45, and an oil reservoir 81 is formed at the bottom of the low-pressure chamber 45.

A scroll type compression mechanism C is provided in the upper part of the low-pressure chamber 45, and a motor M for driving the same through a rotary shaft 5 is provided in a lower part thereof. A suction pipe 82 is fixed to the outer surface of the closed housing 8 so as to open to the low-pressure chamber 45 at an intermediate height between the scroll compression mechanism C and the motor M.

The motor M comprises a rotor Ma and a stator Mb. The rotor Ma is fixed to the rotary shaft 5 and the stator Mb
Is fixed by press-fitting into the closed housing 8. The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, a frame 6, a rotation preventing mechanism 3, and the like.

The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on the inner surface thereof. A discharge port 13 is formed in the center of the end plate 11.

The orbiting scroll 2 has an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. A drive bush 54 is provided inside a boss 23 erected at the center of the outer surface of the end plate 21. It is rotatably fitted via 73.

A hole 55 formed in the drive bush 54
An eccentric pin 53 projecting from the upper end of the rotary shaft 5 is fitted therein.

[0008] A plurality of closed spaces 24 are formed by displacing the fixed scroll 1 and the orbiting scroll 2 with each other by a predetermined distance and shifting them by 180 degrees to engage with each other.

The frame 6 is fixed to a sealed housing 8, and the fixed scroll 1 is fixed to the frame 6 by a plurality of bolts.
32 concluded. An outer surface of the end plate 21 of the orbiting scroll 2 is slidably supported on a thrust surface 65 formed on the upper surface of the frame 6, and a plurality of oil grooves 66 are formed in the thrust surface 65.

[0010] Between the peripheral edge of the outer surface of the end plate 21 of the orbiting scroll 2 and the frame 6, a rotation preventing mechanism 3 comprising an Oldham link or the like for preventing the orbiting scroll 2 from rotating is provided. Has been established.

A cylindrical flange 16 protrudes upward from the center of the outer surface of the end plate 11 of the fixed scroll 1. A cylindrical flange protrudes downward from the outer peripheral surface of the flange 16 and the lower surface of the discharge cover 31. O between inner surface of flange 38
The discharge cavity 42 is formed by fitting tightly through the ring 39.

A discharge hole 46 communicating with the discharge cavity 42 is formed in the center of the discharge cover 31, and the discharge hole 46 is opened and closed by a discharge valve 47. One end of the discharge valve 47 and one end of a valve retainer 48 that regulates the lift are fixed to the outer surface of the discharge cover 31 by bolts 49.

The upper end of the rotary shaft 5 is supported by an upper bearing 71 provided on the frame 6, and the lower end is supported by a lower bearing 72 provided on the stay 18.

By driving the motor M, the rotary shaft 5, the eccentric pin 53, the drive bush 54, the slewing bearing 7
3. The orbiting scroll 2 is driven via the boss 23, and the orbiting scroll 2 revolves orbiting while being prevented from rotating by the rotation preventing mechanism 3.

Then, the gas enters the low-pressure chamber 45 via the suction pipe 82, and enters the plurality of gas suction paths 67 formed in the frame 6 and the gas suction paths 68 and the fixed scroll 1 formed in the fixed scroll 1. It is sucked into the closed space 24 through the provided inlet 15.

The volume of the closed space 24 is reduced by the orbital motion of the orbiting scroll 2 and the compressed space reaches the central portion while being compressed.
Enter 42. Next, the discharge valve 47 is pushed and opened through the discharge hole 46 to enter the high-pressure chamber 44, from which it is discharged to the outside via the discharge pipe 83.

At the same time, the oil in the oil sump 81 is pumped up by an oil supply pump 60 disposed at the lower end of the rotary shaft 5 and passes through an oil supply passage 52 formed in the rotary shaft 5 to form a lower bearing 72 and an upper portion 72. A portion of the oil discharged from the leading end of the oil supply passage 52 lubricates the bearing 71 and passes through the oil groove 66 to the thrust surface 65.
And lubricating the anti-rotation mechanism 3, and the rest is a drive bush.
54, after lubricating the slewing bearing 73, passes through a recess 61 formed in the center of the upper surface of the frame 6 and an oil drain passage 62, passes through an oil passage 84 formed in the stator Mb of the motor M, and collects an oil sump 81. It is dropped into and stored in this.

[0018]

During operation of the conventional hermetic scroll compressor, the gas sucked into the low-pressure chamber 45 from the suction pipe 82 and the oil droplets sucked along with the gas are supplied to the motor M by the motor M. Stirred by the rotor Ma. Accordingly, the oil droplets and the oil dropped from the oil drain passage 62 are blown off by the gas swirling in the low-pressure chamber 45, so that it is difficult to enter the oil passage 84 and is sucked into the scroll type compression mechanism C with the gas. .

As a result, the amount of oil rising, that is, the amount of oil discharged from the closed housing 8 accompanying the discharge gas increases, and the amount of oil dropped into the oil sump 81 decreases. There is a possibility that the amount of oil is reduced and an accident such as poor lubrication or seizure based on the lubrication is caused.

[0020]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is that the inside of a low-pressure chamber limited by partitioning the inside of a closed housing is provided. A scroll-type compression mechanism that draws gas from the low-pressure chamber and compresses it, and a motor that drives the scroll-type compression mechanism via a rotary shaft is disposed below the scroll-type compression mechanism. An opening suction pipe is fixed to the outer surface of the closed housing, and oil stored in an oil sump formed at the bottom of the low-pressure chamber is pumped up by an oil supply pump arranged at a lower end of the rotary shaft. In a hermetic scroll compressor that lubricates the scroll-type compression mechanism through an oil supply passage formed in a rotary shaft and then drops the oil into the oil sump, A hermetic scroll compressor wherein a separator plate covering the opening of the suction pipe is fixed to an inner surface of the closed housing, and a tunnel-shaped suction gas passage extending vertically is formed by the separator plate and the inner surface of the hermetically sealed housing. It is in.

Another feature is that the lower end of the separator plate is closed and the lower part of the opening of the suction pipe is opened below the tunnel-shaped suction gas passage.

Still another feature is that a portion of the separator plate facing the opening of the suction pipe is inclined obliquely downward so that an oil droplet colliding with the opening faces downward.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. 1, (A) is a vertical sectional view of a hermetic scroll compressor,
(B) is a partial cross-sectional view along the line BB of (A).

A gutter-shaped separator plate 90 is fixed to the inner surface of the sealed housing 8 so as to cover the opening 69 of the suction pipe 82 by fixing flanges 91 on both side edges thereof. Tunnel-shaped intake gas passage 93 extending vertically with the inner surface of
Is configured.

The upper end of the separator plate 90 is
, And the lower end is extended so as to slightly enter the oil passage 84. The other configuration is the same as that of the conventional one shown in FIG. 4, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, the oil droplets of the gas refrigerant and the refrigerating machine oil that have passed through the suction pipe 82 enter the suction gas passage 93 through the opening 69. Then, the gas refrigerant rises in the suction gas passage 93 and is sucked into the closed space 24 via the gas suction passages 67 and 68 and the suction port 15.

On the other hand, the oil droplets of the refrigerating machine oil collide with and adhere to the inner surface of the separator plate 90, descend along the inner surface of the separator plate 90, and drop into the oil sump 81 via the oil passage 84.

Accordingly, oil flowing out of the oil discharge passage 62 into the low-pressure chamber 45 and oil droplets floating in the low-pressure chamber 45 by being stirred by the rotor Ma of the motor M are entrained by the gas into the closed space 24. There is no inhalation, and therefore, it is possible to prevent a decrease in the amount of oil stored in the oil sump 81 and an increase in the amount of oil rising, and as a result, prevent accidents such as poor lubrication and seizure based on this. can do.

A second embodiment of the present invention is shown in FIG. In the second embodiment, the lower end of the separator plate 90 is closed, and the lower part of the opening 69 of the suction pipe 82 is opened below the suction gas passage 93. Other configurations are the same as those of the first embodiment. Corresponding members have the same reference characters allotted, and description thereof will not be repeated.

However, the oil droplets of the refrigerating machine oil accompanying the gas refrigerant adhere to the lower tube wall due to the centrifugal force acting on the U-shaped bent portion of the suction pipe 82 in the course of flowing through the U-shaped bent part. The gas refrigerant flows from the lower part of the opening 69 to the low-pressure chamber 45 along this, and the gas refrigerant passes through the upper part of the opening 69 and enters the suction gas passage 93, and the suction gas passage 93, the gas suction passages 67 and 68, and the suction port 15 Through the closed space 24

A third embodiment of the present invention is shown in FIG. In the third embodiment, the portion 94 of the separator plate 90 facing the opening 69 of the suction pipe 82 is inclined obliquely downward by an angle θ so that the oil droplet colliding with the opening 94 faces downward. Other configurations are the same as those of the first embodiment. Corresponding members have the same reference characters allotted, and description thereof will not be repeated.

Thus, the oil droplets accompanying the gas refrigerant in the suction pipe 82 flow out of the opening 69 and are separated from the separator plate 90.
By colliding with the inclined portion 94 of the separator plate 90, it is directed downward and flows out along the inner surface of the separator plate 90.

On the other hand, the gas refrigerant is directed downward once by colliding with the inclined portion 94 of the separator plate 90, but is immediately turned upward by the suction of the scroll type compression mechanism C, and is immediately turned upward. ,
The gas is sucked into the closed space 24 through the gas suction passages 67 and 68 and the suction port 15.

[0034]

According to the present invention, since a separator plate for covering the opening of the suction pipe is fixed to the inner surface of the sealed housing and a tunnel-shaped suction gas passage extending vertically by the separator plate and the inner surface of the sealed housing is formed, Enters the tunnel-shaped suction gas passage through the opening of the suction pipe and rises in the suction gas passage to be sucked into the scroll-type compression mechanism.

Accordingly, oil droplets which are stirred by the rotor of the motor and float in the low-pressure chamber and oil which lubricates the scroll type compression mechanism drop into the oil sump and are sucked into the scroll type compression mechanism along with the gas. Can be prevented. As a result, a decrease in the amount of oil in the oil sump and an increase in the amount of oil rise can be prevented, so that poor lubrication of the scroll-type compression mechanism and seizure due to this can be prevented.

If the lower end of the separator plate is closed and the lower part of the opening of the suction pipe is opened below the suction gas passage, the gas flowing through the suction pipe enters the suction gas passage through the upper part of the opening. Then, the liquid rises in the suction gas passage and is sucked into the scroll type compression mechanism, but the oil droplets accompanying the gas do not enter the suction gas passage from the lower part of the opening of the suction pipe and pass through the low pressure chamber to the oil sump. Since the oil droplets are dropped, it is possible to prevent the oil droplets from being sucked into the scroll-type compression mechanism.

If the portion of the separator plate facing the opening of the suction pipe is inclined obliquely downward so that the oil droplet colliding with the separator plate is directed downward, the oil droplet flowing out of the opening of the suction pipe accompanying the gas will By colliding with the inclined portion of the separator plate and being directed downward and smoothly dropping, it is possible to effectively prevent the oil droplets from being sucked into the scroll-type compression mechanism.

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view of a hermetic scroll compressor, and FIG. 1B is a partial sectional view taken along line BB of FIG. 1A.

FIG. 2 is a longitudinal sectional view of a hermetic scroll compressor showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a hermetic scroll compressor showing a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional hermetic scroll compressor.

[Explanation of symbols]

 8 Closed housing 45 Low pressure chamber C Scroll type compression mechanism 1 Fixed scroll 2 Orbiting scroll 5 Rotary shaft 81 Oil reservoir 82 Suction pipe 69 Opening 52 Oil supply passage M Motor Ma Rotor Mb Stator 60 Oil supply pump 90 Separator plate 93 Tunnel-like intake gas passage

Claims (3)

[Claims] 1. A scroll-type compression mechanism for sucking gas from a low-pressure chamber into a low-pressure chamber limited by partitioning the inside of a closed housing and compressing the same, and a motor for driving the same via a rotary shaft below the scroll-type compression mechanism. At the intermediate height between the scroll-type compression mechanism and the motor, a suction pipe that opens to the low-pressure chamber is fixed to the outer surface of the closed housing, and is stored in an oil sump formed at the bottom of the low-pressure chamber. The oil is pumped up by an oil supply pump disposed at the lower end of the rotary shaft, lubricates the scroll-type compression mechanism through an oil supply passage formed in the rotary shaft, and then drops into the oil sump. In the scroll compressor, a separator plate that covers an opening of the suction pipe is fixed to an inner surface of the hermetically sealed housing. Hermetic scroll compressor, characterized in that the formation of the tunnel-shaped suction gas passage extending vertically through the inner surface of the closed housing. 2. The hermetic scroll compressor according to claim 1, wherein a lower end of the separator plate is closed, and a lower portion of the opening of the suction pipe is opened below the tunnel-shaped suction gas passage. 3. The sealed scroll according to claim 1, wherein a portion of the separator plate facing the opening of the suction pipe is inclined obliquely downward so that an oil droplet colliding with the opening faces downward. Compressor.