JPH051689A - Refueling device for horizontal compressor - Google Patents

Abstract

(57) [Abstract] [Object] The present invention provides an oil supply device for a horizontal compressor, which has a simple configuration and is not limited to the type of the compression mechanism, and can obtain high oil supply reliability. [Structure] A bearing 12A is provided with a pivot hole portion 23 of the rotary shaft 2, and the bearing tool or the rotary shaft is provided with an upper end portion of an eccentric pivot portion 21 in alignment with an upper end portion of the pivot hole portion. Eccentric with the center of the rotary shaft or the center of the pivot hole, an eccentric space chamber 26 is formed between the peripheral surface of the rotary shaft and the bearing inner cavity, and the blade 20 is wound around the rotary shaft to project into the eccentric space chamber, The eccentric space chamber and the oil sump 5 are communicated with each other through the oil suction passage 22. With the rotation of the rotating shaft, the blade makes a spiral motion in the eccentric space chamber, and the eccentric space chamber becomes negative pressure to suck up the lubricating oil through the oil suction passage. The lubricating oil is pushed out by the blade and is supplied to the sliding portion of the compression mechanism section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal compressor, for example, a rotary compressor, and more particularly to improvement of an oil supply device for supplying lubricating oil to a compression mechanism.

[0002]

2. Description of the Related Art Conventionally, a horizontal type compressor is known as a compressor for an air conditioner, for example. In this type of horizontal compressor, since the closed case is horizontal,
As a matter of course, the rotation shaft accommodated in the inside extends in the horizontal direction. An oil reservoir for lubricating oil is formed on the inner bottom of the closed case, and an oil supply device for sucking the lubricating oil along with the rotation of the compressor and supplying it to the compression mechanism provided on the rotary shaft is provided from the oil reservoir. Be prepared.

In a conventional vertical compressor, the rotary shaft extends vertically and its lower end is immersed in the lubricating oil in the oil sump formed on the inner bottom of the closed case.
Therefore, the oil supply device can suck up the lubricating oil easily and reliably with the rotation of the rotary shaft to supply the compression mechanism.

However, in the horizontal compressor, the rotary shaft is parallel to the lubricating oil surface of the oil sump, and there is a considerable distance depending on the compression capacity. Therefore, a highly reliable oil supply device that surely sucks the lubricating oil is desired.

FIG. 5 shows that the applicant of the present invention has applied for Japanese Patent Application No. 62-7467.
It is an example of the oil supply device in the horizontal type rotary compressor filed in No. 2. In the figure, 1 is a horizontal type sealed case, 2
Is a rotary shaft extending in the horizontal direction and accommodated therein, 3 is a rotary shaft 2
The compression mechanism portion 4 provided at one end portion thereof and the electric motor portion 4 provided at the other end portion thereof.

The compression mechanism section 3 is of a rotary type here. Further, the compression mechanism portion 3 is provided with an oil supply device 6 that sucks up lubricating oil from the oil sump portion 5 formed in the inner bottom portion of the closed case 1 to supply the lubricating oil.

That is, reference numeral 7 is a partition plate for partitioning the inside of the closed case 1 into left and right parts.
A pressure difference is generated between the left and right chambers of the inner partition plate 7. And
Due to this pressure difference, the lubricating oil in the oil reservoir 5 is reliably guided from the oil suction passage 8 to the suction hole 9.

The lubricating oil is used for the blade accommodating chamber 10 and the oil supply pipe 1.
It is guided to the oil supply hole 13 provided in the sub bearing 12 via 1 and is oiled to the pivotal support surface of the rotating shaft 2. Since the spiral oil groove 14 is provided on the peripheral surface of the rotary shaft 2, the lubricating oil is supplied to each sliding portion of the compression mechanism portion 3 through the oil groove 14. Become.

As described above, the oil supply device 6 effectively utilizes the differential pressure in the closed case 1 due to the compression action, and also the blade 1 provided in the rotary compression mechanism section 3.
The operation of No. 5 is also used as the refueling operation, and highly reliable refueling can be obtained.

[0010]

However, in the oil supply device 6, the partition plate 7 for partitioning the inside of the closed case 1 is required, and a curved body for forming the oil suction passage 8 is manufactured. However, the device configuration becomes large. Further, since the operation of the blade 15 is used, there is a problem that it cannot be used in a structure other than the rotary compressor.

In addition to the above, various oil supply devices for horizontal compressors have been developed, but in any case, there are problems such as a complicated structure and high reliability of oil supply, and further improvement. Is desired.

The present invention has been made in view of the above circumstances, and an object thereof is a simple structure in which additional parts are suppressed to a necessary minimum, and the type of the compression mechanism is not limited. In addition, the present invention provides an oil supply device for a horizontal compressor that can obtain high oil supply reliability.

[0013]

In order to achieve the above object, according to the present invention, a rotary shaft for connecting a compression mechanism portion is horizontally accommodated in a horizontally sealed case having an oil reservoir for lubricating oil. In a horizontal compressor, a bearing is provided with a pivot hole for rotatably pivoting the rotary shaft, and an eccentric pivot is provided on the bearing or the rotary shaft so that the center of the rotary shaft or the center of the pivot hole is provided. By eccentricity, an eccentric space chamber is formed between the peripheral surface of the rotating shaft and the inner cavity of the bearing, and a blade is wound around the rotating shaft to project into the eccentric space chamber and perform a spiral motion as the rotating shaft rotates. The oil supply device for a horizontal compressor is characterized in that one end opening of the oil suction passage is opened in the eccentric space and the other end opening is immersed in the lubricating oil in the oil sump.

[0014]

With the rotation of the rotary shaft, the blade makes a spiral motion in the eccentric space chamber. Therefore, the eccentric space chamber has a negative pressure and sucks the lubricating oil through the oil suction passage. The lubricating oil is pushed out by the blade and is supplied to the sliding portion of the compression mechanism section.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an oil supply device K for a horizontal compressor. It is assumed that the compressor includes the rotary compression mechanism section 3 as described above with reference to FIG. Alternatively, it may be of a reciprocating type, or of a scroll type, which tends to be frequently used recently.

The point is that the horizontally rotating hermetic case 1 accommodates the rotary shaft 2 extending in the horizontal direction, and the compression mechanism portion is provided at one end of the rotary shaft 2. Therefore,
It goes without saying that the other end of the rotary shaft 2 is provided with the electric motor unit as described above.

One end of the rotary shaft 2 is rotatably supported by a sub bearing 12A which is a bearing tool. The above sub bearing 12A
Are directly or indirectly provided on the side surface of the closed case 1. Here, the details are omitted.

An oil supply device K provided in such a compressor
Is a spiral blade 20 provided at the end of the rotary shaft 2.
And an eccentric pivot support hole portion 2 as an eccentric pivot support portion which is an internal cavity provided in the auxiliary bearing 12A accommodating the blade 20.
1 and an oil suction path 22.

First, the sub bearing 12A will be described. As shown in FIGS. 2A and 2B, the pivot hole 23 and the eccentric pivot hole 21 are connected to each other along the axis. It is provided in the state where it was opened.

The pivot hole portion 23 is formed to have a diameter φD that rotatably supports the end portion of the rotary shaft 2. The axis of the eccentric pivot hole 21 communicates with a position eccentric from the axis of the pivot hole 23 by a predetermined amount e.

Then, the respective upper end portions A of the pivot hole portion 23 and the eccentric pivot hole portion 21 which intersect the vertical axis CL are made to coincide with each other. As a result, the diameter of the pivot hole 23 is changed to φ
When D, the diameter of the eccentric pivot hole 21 is φ (D + 2
e).

The pivot hole 23 and the eccentric pivot hole 2 are also provided.
The upper end portion of the oil supply hole 25 is opened at the peripheral portion of the lower end portion where the eccentricity e is maximized at the portion continuously provided with 1. The oil supply hole 25 is provided in the vertical direction, and the lower end portion of the oil supply hole 25 has the auxiliary bearing 12A.
Open on the lower peripheral surface.

As shown in FIG. 1 again, a part of the rotary shaft 2 is inserted into the eccentric pivot hole 21 with the rotary shaft 2 being pivotally supported by the pivot hole 23. Eccentric pivot hole 21
The eccentric space chamber 26 is formed between the peripheral surface and the peripheral surface of the rotary shaft 2.

The upper end of the oil suction pipe 27 is fitted into the oil supply hole 25. The lower end portion of the oil suction pipe 27 always extends so as to be immersed in the lubricating oil collected in the oil sump portion 5 at the inner bottom portion of the closed case 1. These oil suction pipes 2
7 and the oil supply hole 25 constitute the oil suction passage 22.

FIG. 3 shows a state in which the blade 20 is wound around the spiral groove 28 provided at the end of the rotary shaft 2.
The spiral groove 28 has at least two turns. The blade 20 is wound around the spiral groove 28 and is pivotally supported by the eccentric pivotally supporting hole portion 21 of the auxiliary bearing 12A as shown in FIG. It becomes the same as the surface, and this lower end is the rotary shaft 2
It projects from the peripheral surface.

The blade 20 is, as shown in FIG.
It has at least two turns, and is made of an extremely smooth material other than a metal material such as a fluororesin or a synthetic resin. Therefore, the specific gravity is smaller than that of the metal material, and the amount of unbalance can be reduced. The wall thickness, the height dimension, and the number of turns are the same as those of the spiral groove 28 provided at the end of the rotary shaft 2. When the diameter of the end of the rotary shaft 2 is φd, the outer diameter dimension φ of the blade 20 is

It is d + 2e. The diameter φd of the end of the rotary shaft 2 is equal to the diameter φD of the pivot hole 23,
Therefore, the outer diameter φ (d + 2e) of the blade 20 is equal to the diameter φ (D + 2e) of the eccentric pivotally supporting hole portion 21.

In the horizontal compressor provided with the oil supply device K constructed as described above, the compression mechanism portion 3 still performs the compression action as the rotary shaft 2 rotates. The blade 20 wound around the end of the rotary shaft 2
Rotates integrally with the rotating shaft 2 in the eccentric space chamber 26,
And make a spiral motion.

To explain further, the upper end A of the pivot hole 23 and the upper end A of the eccentric pivot hole 21 coincide with each other. The upper end portion A and the upper end portion of the blade 20 are on the same line, and the blade 20 is used as a partition line to define the eccentric space chamber 26.
Will be divided into multiple rooms for several turns.

Since the blade 20 makes a spiral motion, the partition line moves in the rotational direction, and the plurality of chambers partitioned by the blade 20 gradually move to the other end side of the rotary shaft (not shown). ..

The plurality of chambers that are partitioned by the blade 20, which is the eccentric space chamber 26, are in a negative pressure state, and the oil suction pipe 27 that communicates therewith sucks up the lubricating oil in the oil sump 5. The lubricating oil is introduced into the eccentric space chamber 26 through the oil supply hole 25, and is filled in the plurality of chambers by the spiral movement of the blade 20.
Furthermore, it is pumped in the same direction.

Finally, the lubricating oil is supplied to the compression mechanism section 3. Since the oil supply is accompanied by the spiral movement of the blade 20, its operation is reliable and a high oil supply reliability is obtained.
Then, the blade 20 is the only new component that constitutes this oil supply device, and the spiral groove 28 is machined on the end of the rotary shaft 2 and a part of the pivot hole 23 of the auxiliary bearing 12A is turned into the eccentric pivot hole 21. It only has to be changed.

In the above embodiment, the eccentric pivot hole 21 is provided in the auxiliary bearing 12A and the eccentric space chamber 26 is formed between the auxiliary bearing 12A and the peripheral surface of the rotary shaft 2. However, the present invention is not limited to this. Instead, the auxiliary bearing 12A side is provided so as to pass through only the pivotally supporting hole portion 23, and the blade 20 is wound by performing eccentric processing so that an eccentric space chamber can be formed in a part of the rotating shaft 2 side. Good.

In the above embodiments, the rotary type compression mechanism 3 is applied, but the compression mechanism 3 is not limited to this, and may be reciprocating type or scroll type. Well, its composition is free. In short, it can be applied to all of the oil supply devices provided in the horizontal compressor. Further, various modifications can be made without departing from the scope of the present invention.

[0036]

As described above, according to the present invention, the blade is wound around the rotary shaft of the horizontal compressor, and the blade is pivotally supported in the eccentric space chamber, and the blade is rotated as the rotary shaft rotates. Since the oil is sucked up through the oil suction path to feed the compression mechanism with oil, the blades are the only additional parts, and the simple construction that minimizes the necessary machining work is required. Thus, it is possible to obtain high lubrication reliability of reliably sucking up the lubricating oil in the oil sump portion and to supply the lubricating oil, and moreover, it can be applied regardless of the type of the compression mechanism.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an oil supply device for a horizontal compressor, showing an embodiment of the present invention.

FIG. 2A is a vertical cross-sectional view of a sub bearing of the same embodiment. (B) is a front view of a part of the sub bearing of the embodiment.

FIG. 3 is a side view of a rotary shaft end portion and a blade of the embodiment.

FIG. 4 is an exploded side view of a rotary shaft end and a blade according to the embodiment.

FIG. 5 is a vertical sectional view of an oil supply device for a horizontal rotary compressor, showing a conventional example.

[Explanation of symbols]

1 ... Airtight case, 2 ... Rotating shaft, 3 ... Compression mechanism part, 23 ...
Pivot hole portion, 12A ... Bearing tool (auxiliary bearing), 21 ... Eccentric pivot portion (eccentric pivot hole portion), 26 ... Eccentric space chamber, 20 ... Blade, 5 ... Oil sump portion, 22 ... Oil suction passage.

Claims (1)

Claim: What is claimed is: 1. A horizontal sealed case having an oil reservoir for lubricating oil at the inner bottom thereof, and a rotary shaft which is housed in the sealed case in the horizontal direction and which is connected to a compression mechanism section. In a horizontal compressor having a bearing, a bearing having a pivot hole for rotatably pivoting the rotary shaft, and a center of the rotary shaft or a pivot hole provided on either the bearing or the rotary shaft. An eccentric pivotal support part that forms an eccentric space chamber between the peripheral surface of the rotation shaft and the bearing member inner cavity by eccentricity with the center of the part, and the rotation of the rotation shaft wound around the rotation shaft and protruding into the eccentric space chamber. A horizontal installation type characterized by comprising a blade that makes a spiral motion associated with the above, and an oil suction path in which the one end opening is opened in the eccentric space chamber and the other end opening is immersed in the lubricating oil in the oil sump. Refueling device for compressor.