JPS6187994A - Horizontal scroll fluid machine - Google Patents

Abstract

PURPOSE:To enable stable oiling to each sliding part by forming a ring-shaped oil reservoir and connecting a pipe line communicating with an oil sump at the bottom of a closed vessel and a centrifugal pump passage to this oil reservoir, in a horizontal enclosed scroll compressor. CONSTITUTION:A ring-shaped oil reservoir 8d is formed around the main shaft 7 in the main bearing 8 of a horizontal enclosed scroll compressor. On the other hand, this oil reservoir 8d is connected to a pipe line 11 communicating with an oil sump 4 storaged at the bottom of the enclosed vessel and also opens to an oil passage 7e communicating with an oil hole 7c in the main shaft. Oil in the oil hole 7c is supplied to bearings 8a' and 8a by the centrifugal force caused by the rotation of main shaft, and deficient oil is replenished to the oil reservoir 8d through the pipe line 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a horizontal scroll fluid machine, and particularly to a structure for lubricating each sliding portion.

[Background of the invention]

Lubricating method for each sliding part in a hermetic scroll compressor, which is a row of horizontal scroll fluid machines. A method of supplying oil to each sliding part by feeding it into the oil supply hole provided in the.

(2) A system in which the oil in the oil reservoir is guided from the outer periphery of the drive shaft to the oil supply hole in the shaft, using pressure running metals between the high pressure part and the low pressure part, to supply oil to each sliding part.

There is.

However, in the former case, the number of parts increases and the structure becomes complicated. Although the structure of the mafc @ is an intermediate wheel, on the other hand, the sliding part on the low pressure side,
Since no consideration is given to the distribution of the amount of oil to the sliding parts on the opposite side from this sliding part, a large amount of oil tends to flow to the sliding parts on the low pressure side, making it difficult to supply oil to each sliding part. OBJECT OF THE INVENTION An object of the present invention is to provide a horizontal scroll fluid machine that has a simple structure and can provide stable oil supply to each sliding part.

[Summary of the invention]

In order to achieve this object, the present invention provides an oil sump portion that communicates with the oil sump via an oil suction passage on the outer periphery of the drive shaft at a position remote from the low pressure portion, and within the drive shaft. An oil sump part, an oil supply hole, and an oil suction hole that moves slowly are provided, and due to the centrifugal pump action V caused by the rotation of the driving duck, the old oil sump 9 is absorbed through the oil sump J mountain passage, the oil 1 part, and the 111i γ field hole. [Embodiment of the Invention] An embodiment of the present invention will be explained with reference to FIG. 1. 1st
The figure shows a vertical view of a hermetic scroll compressor according to the invention. In the figure, a closed container 1, 1'c1, a Niss scroll compressor 2, and a 1'-type fitting are housed horizontally, and the lower part of the container 1 serves as an oil reservoir 4.

The scroll compression mechanism 2 includes an orbiting scroll 5, a fixed scroll 6, a drive unit 7, a frame 8, and an anti-rotation mechanism 9.

The orbiting scroll 5rt has a spiral wrap 5b on the base plate (end plate) 5a. Also, there is a kaku on the back of the mirror plate! A bearing 5c into which the crank pin of the @shaft is inserted is provided in the spring plate with pressure equalizing holes 5d and 5e communicating the mid-compression position.

The fixed scroll 6 similarly has a spiral wrap 6b on the base plate 6a. Further, a suction hole 5c is provided at the outer circumference of the wrap, and a discharge hole 6d is provided at the center of the wrap.

7 The frame 8 has bearings 8a+8a' that support the drive shaft 7,
A notch Bb for holding the orbiting scroll and a back pressure chamber 8C for applying an appropriate pressing force to the orbiting scroll are provided.

The orbiting scroll 5 and the fixed scroll 6 overlap each other b
b and 6b facing inward, and the orbiting scroll 5 is sandwiched between the fixed scroll 6 and the frame 8. There is a rotation prevention mechanism 9 between the back of the orbiting scroll and the frame.
will be installed.

The drive shaft 1 has at one end a crank pin 7ar supported by the single bearing 5C. In addition, there is an oil supply hole 7C in the drive shaft 7.
The shaft 70 is provided on the rotation center. This oil supply hole 70
are opened in the sliding portion of the crank pin 7a, and also opened in the bearings 8a+8a' via oil supply holes 7f and 7f', respectively. On the other hand, the drive shaft 7 that is separated from the low pressure part of the compression mechanism 2
An oil dD portion 8d is provided on the outer circumferential portion of. The oil reservoir 8d is formed by an annular groove 8e provided on the outer circumference of the shaft of the frame 8 and an annular groove 7d provided on the outer circumference of the drive shaft 7. The oil a part 8d is the oil suction passage 11.
communicates with the oil sump 4 and is driven! An oil absorption hole 76 provided in 1117 communicates with the oil supply hole IC.

The closed container 1 is provided with a suction pipe 1b and a discharge pipe 1C, and the suction pipe 1b is attached to the suction hole 6C of the fixed scroll 6.

Next, the effect of the scroll pressure m will be explained.

α motion F! When the drive shaft 7 rotates according to A3, the orbiting scroll performs an orbiting motion due to the rotational movement of the crank pin 7a and the rotation prevention mechanism 9.

As a result, as the space formed by the lap of the orbiting scroll and the solid scroll and the plywood moves to the center, its total volume decreases, compressing the gas sucked through the suction hole 6C,
It is discharged from the discharge hole 6a.

The discharged gas flows down the container through the passage 10 1i
After cooling the Ed machine 3, it is discharged from the discharge pipe IC.

When the scroll performs a compression action, a force acts to separate the orbiting scroll and the fixed scroll.

To prevent this, the back pressure chamber 8 on the back of the orbiting scroll is
The pressure inside C is maintained at an appropriate pressure (intermediate pressure) lower than the discharge pressure and higher than the suction pressure by the pressure equalization hole 5d.

On the other hand, oil supply to each sliding part is performed by a centrifugal pump action generated in the oil supply hole by rotation of the drive shaft 70. That is, the oil supply hole IC is located at the rotation center of the drive shaft 7, and since the oil absorption hole 7e is shorter than the oil supply hole 7f, the oil supply hole 7f is located at the rotation center of the drive shaft 70.
Pumping action due to centrifugal force occurs in the area. As a result, oil from the oil sump 40 passes through the oil suction passage 111tfi and is sucked up to the oil sump portion 8d, and the oil passes through the oil suction hole 7e to the oil supply hole IC.
is guided through the oil supply holes 7f, 7f/ to each bearing 8a.
, 8a' and also to the crank pin section.

Therefore, the support part 8 on the opposite side of the low pressure part (back pressure chamber 8G)
Sufficient oil is supplied to a, that is, stable oil is supplied to each sliding part.

FIG. 2 shows another embodiment of the invention, in which the drive shaft 7
A spiral passage 12 is formed on the inner surface of the oil supply hole 7C, and a pump action is performed in the spiral passage 12 by 10 rotations of the drive shaft, thereby stably supplying oil to the oil supply hole 7F. Ru.

The spiral passage 12 is connected to the oil supply hole 7 as shown in FIG.
A spiral groove 12a2 is cut on the inner surface of C. However, the mano ζ is formed by inserting a 4R-shaped member 12bi into the circular surface of the oil supply hole IC, as shown in FIG. Note that the n*-shaped d12a may be provided over the entire oil supply hole as shown in FIG. 3, or may be provided only in the vicinity of the oil absorption hole 7e and the oil supply hole 7f as shown in FIG. Further, the spiral member 12b may be provided throughout the oil supply hole as shown in FIG. 5, or only in the vicinity of the oil absorption hole 7e and the oil supply hole 7f as shown in FIG.

FIG. 7 also shows another embodiment of the present invention.
Oil supply hole 704 in 47. Near the center of rotation of the shaft in the low pressure section,
It has a configuration in which it is provided obliquely to the axis so as to be off the center of rotation of the machine axis away from the low pressure section.

In this embodiment, a centrifugal pump action occurs in the oil supply hole 7C extending from the oil absorption hole 78 section to the oil supply hole rf section, and in the bearing B a / section on the low pressure side, the oil supply hole IC is deviated from the axis of the drive m7 and centrifuged. Since the force is reduced, balanced lubrication is achieved.

In the embodiment shown in FIG. 8, a %
An oil supply hole 7c/ communicating with the sliding part is provided, and a passage 7j communicating with the oil absorption hole 7e and the second oil reservoir 1'3 at the end of the shaft on the low pressure side is provided at a position off the center of rotation, and the pump As a result, the oil in the oil reservoir 4 is sucked into the oil absorption hole 7e through the oil absorption passage 11 and the oil reservoir 9 portion 8d, and the oil is sucked into the oil absorption hole 7e through the oil absorption passage 11 and the oil sump 9 portion 8d.
The bearing 8a18a is inserted through the oil reservoir 13 and the oil supply hole 70'.
It is configured to supply fuel to '.

According to this embodiment, the oil supply is sequentially supplied to the sliding parts without branching into two directions, so that no imbalance occurs in the oil supply.

The embodiment shown in FIGS. 9 and 10 is similar to that shown in FIG. @2
An oil reservoir 13t1 is provided at the shaft end of the drive shaft 7 away from the low pressure side, and the oil reservoir 13 and the oil absorption hole 7e are connected to the passage 7j.
It has a structure in which it is connected by.

According to this embodiment, the oil supply to the bearings is sequentially performed starting from the bearing 8a that is farther from the low pressure side, so that the oil supply is well balanced. Note that 14 indicates a stopper for the second oil reservoir 13.

In the embodiment shown in FIGS. 11 and 12, the bearing 8a is provided in the portion of the bearing 8a that is farthest from the oil absorption hole Ie metal low pressure side.
A tenth oil reservoir part 15 consisting of a nape-shaped groove is provided in the inner part of the shelf support 8a, and a second oil reservoir part 16 is provided in the inner peripheral part of the shelf support 8a. While communicating with the reservoir 15, the tenth oil reservoir 15 and the second oil ei
II9 section 16 is communicated with the boat 17, and the second oil reservoir section 16 is connected to the oil suction passage 1 through the communication passage 18 in the frame 8.
1. In addition, 19 indicates a stopper.

In this embodiment as well, oil supply to the bearings is carried out sequentially starting from the bearings farther away from the low-pressure side, so the oil supply is well balanced.

Note that in this embodiment, the passage 18 may be omitted by directly connecting the oil absorption passage 11 to the 20th oil reservoir 16.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to stably supply oil to each sliding portion without providing an oil supply pump.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a horizontal can-closed scroll compressor which is an embodiment of the present invention, FIGS. 2, 7 and 8,
9 and 11 are cross-sectional views of a hermetic scroll compressor showing other embodiments of the present invention, and FIGS. 3 to 6 show specific examples for forming the spiral passage in FIG. 2. figure,
FIG. 10 is a cross-sectional view of the drive shaft in FIG. 9, and FIG. 12 is a cross-sectional view showing the structure around the oil absorption hole in FIG. 11. 1... Airtight container 2... Scroll compression mechanism 4.
...Oil sump #) 1...Drive shaft 7Cs7"...
Oil supply hole 7e...Oil absorption hole 1f...Oil supply hole
I''...Passage 8a...Bearing 8d...Oil sump 11...Oil absorption passage 12...Spiral passage
13...Second oil sump 15...First oil sump 16...Second oil sump II...Boat
18...Aisle. End of 10 rods tZIX]

Claims (1)

[Claims] A scroll-type fluid mechanism and a drive shaft that drives it are horizontally arranged and housed in a sealed container, and the inside of the sealed container is kept at high pressure.The lower part of the container is an oil reservoir, and the oil in the oil reservoir is used as a high-pressure section. In a horizontal scroll fluid machine that utilizes the differential pressure between the drive shaft and the low pressure section to guide the oil from the drive shaft's outer periphery to an oil supply hole provided in the shaft to supply oil to each sliding section, the drive shaft's outer periphery at a position away from the low pressure section. An oil sump part is provided in which the oil sump communicates with the oil sump through an oil suction passage, and an oil sump part is provided in the drive shaft to communicate the oil sump part and the oil supply hole. A horizontal scroll fluid machine characterized in that oil in an oil reservoir is guided to an oil supply hole through an oil absorption passage, an oil reservoir portion, and an oil absorption hole.