JPH05209595A - Refueling device for horizontal compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has a simple structure, is not limited to the type of the compression mechanism, and can obtain high reliability of refueling, improve the pivotal reliability of the rotary shaft, and perform the assembly work. Provided is an oil supply device for a horizontal compressor, which can improve the property. [Structure] A rotary shaft 2 formed by connecting compression mechanisms is horizontally accommodated in a horizontally sealed case 1 having an oil reservoir 5 for lubricating oil, and the rotary shaft of a bearing 12A is pivotally supported. Adjacent to the pivot hole portions 23a and 23b, an eccentric pivot portion 21 is provided between them, an eccentric space chamber 26 is formed between the peripheral surface of the rotating shaft and the bearing member inner cavity, and the blade 20 is attached to the rotating shaft. It was spirally wound and projected into the eccentric space chamber, one end opening of the oil suction passage 22 was opened in the eccentric space chamber, and the other end opening was immersed in the lubricating oil in the oil reservoir.

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 sealed case, and an oil supply device for sucking the lubricating oil along with the rotation of the compressor and supplying the oil to the compression mechanism provided on the rotary shaft is provided. 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. 7 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 a first object thereof is a simple structure in which additional parts are suppressed to a necessary minimum, and the type of the compression mechanism is limited. Without fail, high lubrication reliability can be obtained, and the surface pressure applied to the support end of the rotating shaft can be minimized to achieve smooth pivoting characteristics without galling wear, etc. Is provided.

A second object is a simple structure in which the number of additional parts is suppressed to a necessary minimum, high lubrication reliability can be obtained regardless of the type of compression mechanism, and the assembling work can be performed. (EN) Provided is an oil supply device for a horizontal compressor, which can be easily completed and the number of steps can be reduced.

[0014]

[Means for Solving the Problems] The above first object is achieved.
The first aspect of the present invention provides an oil reservoir for lubricating oil on the inner bottom.
By connecting the compression mechanism part in the horizontal sealed case that has
If the rotating shaft is accommodated horizontally, the rotating shaft
A bearing having a pivot hole for rotatably supporting the
An eccentric pivot support is provided adjacent to the hole, and the center of this pivot support is
Due to the eccentricity, the eccentricity causes the eccentricity
A heart chamber is formed and a blade is spirally wound around the rotating shaft.
Project into the eccentric space chamber and rotate together with the rotating shaft
And open one end of the oil suction passage into the eccentric space chamber.
Then, immerse the opening on the other end in the lubricating oil in the oil reservoir, and
The fulcrum is located at the center of the bearing, and both sides of this eccentric pivot fulcrum are
Side-mounted compression characterized by adjacent pivot holes on the side
It is the refueling device of the machine.

According to a second aspect of the present invention for achieving the above second object, a rotary shaft formed by connecting a compression mechanism portion to a horizontally sealed case having an oil sump portion for lubricating oil on an inner bottom portion thereof is provided. In a horizontally accommodated one, an eccentric pivot portion is provided adjacent to the pivot hole portion in a bearing having a pivot hole portion for rotatably pivoting a rotary shaft, and is eccentric with the center of the pivot hole portion. As a result, an eccentric space chamber is formed between the peripheral surface of the rotary shaft and the bearing inner cavity, and the blade is spirally wound around the rotary shaft to project into the eccentric space chamber and rotate integrally with the rotary shaft, resulting in eccentricity. One end opening of the oil suction passage is opened in the space chamber, the other end opening is immersed in the lubricating oil in the oil sump, and the end face peripheral edge of the pivot support hole or the eccentric pivot support on the side where the blade is inserted during assembly. A chamfer with an outer diameter larger than the outer diameter of the blade is provided along the A fuel supply device of the horizontal type compressor.

[0016]

In the first aspect of the invention, the blade rotates in accordance with the rotation of the rotary shaft, the eccentric space chamber becomes negative pressure, sucks the lubricating oil through the oil suction passage, and the lubricating oil is pushed out by the blade. Oil is supplied to the sliding parts of the compression mechanism. Since the pivot support holes are provided adjacent to both sides of the eccentric pivot support, a long effective support length of the bearing member with respect to the rotating shaft can be secured.

In the second aspect of the invention, the blade rotates in accordance with the rotation of the rotating shaft, the eccentric space chamber becomes negative pressure, sucks up the lubricating oil through the oil suction passage, and the lubricating oil is pushed out by the blade, Oil is supplied to the sliding parts of the compression mechanism. At the time of assembling these components, the blade is wound around the rotary shaft and inserted and fitted in the bearing tool. At this time,
The blade is guided by abutting against a chamfered portion provided on the blade insertion side end surface of the pivot hole or the eccentric pivot portion, the diameter thereof is smoothly reduced without difficulty, and the blade is attached to the eccentric space chamber.

[0018]

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. Although not shown here, it is assumed that the compressor includes the rotary compression mechanism unit 3 as described above with reference to FIG. 7. 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 rotary mechanism 2 which extends horizontally is housed in the horizontally sealed case 1 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 21 as an eccentric pivot support portion which is an internal cavity provided in the auxiliary bearing 12A that accommodates the blade 20.
And an oil suction path 22.

First, the sub bearing 12A will be described. As shown in FIGS. 2A and 2B, a pair of pivot support holes 23a and 23b along the axis and the eccentric pivot support hole are provided. 21 are connected to each other.

To explain further, the eccentric pivotally supporting hole portion 21 is provided in the central portion of the auxiliary bearing 12A, and one pivotal supporting hole portion 23a is provided on one side and the other pivotally supporting hole portion 23b is provided on the other side. Adjacent to each other.

The pivot holes 23a and 23b rotatably support the ends of the rotary shaft 2. The shaft center of the eccentric pivot hole 21 communicates with a position eccentric from the shaft holes 23a and 23b by a predetermined amount e.

The upper ends W of the pivot support holes 23a and 23b and the eccentric pivot support hole 21 which intersect the vertical axis CL are aligned with each other. As a result, the pivot hole 23
When the diameter of a and 23b is φD, the eccentric pivot hole 21
Has a diameter of φ (D + 2e).

Only the other pivot hole 23b is provided with the oil guide groove 30.
Is provided. A cross section of the groove 30 is provided along the axial direction in a direction in which the eccentric pivotally supporting hole portion 21 is eccentric with respect to the pivotally supporting hole portion 23b, that is, at a position opposite to the upper end portion W via the axial center. It is a V-shaped groove.

Instead of the oil guide groove 30, it is conceivable to provide a groove of the same shape on the peripheral surface side of the rotary shaft 2. However, in this case, it is difficult to set the position because it is provided in a very small part in the axial direction.

Further, the upper end portion of the oil supply hole 25 is opened at the adjacent portion between the one pivot support hole portion 23a and the eccentric pivot support hole portion 21 and on the peripheral surface of the bottom end portion where the eccentricity e is maximized. .. This is provided in the vertical direction, and the lower end thereof opens to the peripheral surface of the lower side of the auxiliary bearing 12A.

As shown in FIG. 1 again, a part of the rotary shaft 2 is inserted into the eccentric pivot hole 21 while the rotary shaft 2 is pivotally supported by the pivot holes 23a and 23b. The eccentric space chamber 26 is provided between the peripheral surface of the eccentric pivot hole 21 and the peripheral surface of the rotary shaft 2.
Will be formed.

The upper end of the oil suction pipe 27 is inserted 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 bottom portion inside the closed case 1. The oil suction pipe 27 and the oil supply hole 25 constitute the oil suction passage 22.

FIG. 5 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 is formed with 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 projects from the peripheral surface of the rotary shaft 2.

The blade 20 is, as shown in FIG.
For example, it is formed of an extremely smooth material other than a metal material such as a fluororesin or a synthetic resin. The specific gravity is smaller than that of metal materials, 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 (d + 2e). The diameter φd of the end of the rotary shaft 2 is equal to the diameter φD of the pivot hole portions 23a and 23b, the outer diameter φ (d + 2e) of the blade 20 and the diameter φ (d of the eccentric pivot hole portion 21.
+ 2e) is equivalent.

As shown in FIGS. 1 and 2 again, here, along the peripheral end portion of the pivot hole portion 23b, and the auxiliary bearing 12A.
The chamfered portion 29 is provided only on the end face side. This chamfer 2
No. 9 is processed with an inclination of 30 ° to 45 ° in cross section with reference to the peripheral edge along the diameter of the pivot hole 23b. The outer diameter φD ₀ of the chamfered portion 29 on the side of the end surface of the auxiliary bearing 12A needs to be at least larger than φ (d + 4e).
That is, φD ₀ > φ (d + 4e) must be set.

In assembling the above-mentioned oil supply device K,
The blade 20 is wound around the spiral groove 28 of the rotary shaft 2 in advance, and the oil suction pipe 27 is connected to the oil supply hole 25 to be attached to a predetermined portion or a sub-bearing before being attached to a predetermined portion. Attach to 12A.

Here, the end of the rotary shaft 2 is connected to the auxiliary bearing 12A.
The chamfered portion 29 is aligned with the end face side pivot hole 23b. From this state, the end of the rotary shaft 2 is attached to the pivot hole 23
It is pushed into b, and is inserted into the other pivot hole 23a through the eccentric pivot hole 21.

The blade 20 wound in advance on the spiral groove 28 of the rotary shaft 2 first comes into contact with the chamfered portion 29 when the rotary shaft 2 is inserted. The outer diameter of the blade 20 is the same as the eccentric pivot hole 21 (φ (d + 2e)), while the outer diameter φD ₀ of the chamfer 29 is φ (d + 4e).
Since it was set to a larger value, there is a margin at first.

However, the diameter φD of the eccentric hole portion 23b is
Since it is the same as the diameter of the rotating shaft φd and is smaller by 2e, the outer diameter of the blade 20 is reduced to φD while passing through the chamfer 29. As described above, since the chamfered portion 29 is formed in a tapered shape of about 30 ° to 45 °,
The blade 20 can be naturally reduced in diameter with extremely small resistance.

Moreover, when the rotary shaft 2 is inserted, the blade 20
5 does not necessarily project to the lower side of the rotary shaft 2 as shown in FIG. 5, but conversely may project to the upper side, one of the left and right sides, or substantially uniformly along the circumferential surface.

No matter which direction the blade 20 is inserted in, the chamfered portion 29 has an outer diameter φD ₀ larger than φ (d + 4e), so that the guide is smooth. Absent.

In the normal state where the blade 20 is located in the eccentric space chamber 26, the rotary shaft 2 has both eccentric hole portions 23a, 23.
It is rotatably supported by b. Therefore, it is possible to secure a sufficient supporting length, and the surface pressure applied to these supporting ends is reduced due to the rotation of the rotary shaft 2, so that no galling wear occurs.

In the horizontal compressor provided with the oil supply device K configured as described above, the compression action is still performed by the compression mechanism portion 3 with the rotation of the rotary shaft 2. 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.

To explain further, the pivot hole portions 23a, 23b
And the upper end W of the eccentric pivot support hole 21 coincides with each other.
These upper ends W and the upper ends of the blades 20 are on the same line, and the blades 20 are used as partition lines to define the eccentric space 2
6 will be divided into a plurality of closed chambers corresponding to the number of windings.

Since the blade 20 has a spiral shape, the partition line moves in the rotation direction, and accordingly, the plurality of chambers partitioned by the blade 20 gradually move to the adjacent pivotal support hole 23b side.

The plurality of closed chambers, which are the eccentric space chambers 26 and partitioned by the blade 20, are in a negative pressure state, and the oil suction pipe 27 communicating with the closed chambers sucks up the lubricating oil in the oil sump 5.
The lubricating oil is introduced into the eccentric space chamber 26 via the oil supply hole 25, is filled in the plurality of closed chambers by the rotation of the blade 20, and is pressure-fed in the same direction.

The pressurized lubricating oil exits from the eccentric space chamber 26 and is pumped to the other pivot hole 23b. In particular, the oil guide groove 30 is provided here, and the lubricating oil is smoothly guided and passes therethrough, and finally is supplied to the compression mechanism portion.

Since the oil supply is accompanied by the spiral movement of the blade 20 as described above, the 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 the pivot hole 23 of the auxiliary bearing 12A.
The eccentric pivot hole 21 may be provided between the a and 23b. Note that the oil supply device Ka may be provided with the auxiliary bearing 12B as shown in FIGS. 3 and 4A and 4B.

The sub bearing 12B has one pivot support hole 23.
One eccentric pivot support hole portion 21 is provided adjacent to. The diameter φD of the pivot hole 23 and the diameter φ of the eccentric pivot hole 21
The setting of (D + 2e) is exactly the same as in the above embodiment.

The pivot hole 23 rotatably supports the end of the rotary shaft 2, and the rotary shaft 2 is wound around the eccentric space chamber 26 formed between the eccentric pivot hole 21 and the rotary shaft 2. Mounted outer diameter φ
The (D + 2e) blade 20 is projected, and the oil supply hole 2
5 is provided and the oil suction path 22 is formed in the same manner.

The chamfered portion 29 extends along the peripheral edge of the end surface of the eccentric pivotally supporting hole portion 21, which is the end surface of the sub bearing 12B.
To provide. The outer diameter φD ₀ of this end face is φ (D + 4e)
It is exactly the same as that in the above-described embodiment.

Therefore, the blade 20 is attached to the spiral groove 28.
When assembled in the auxiliary bearing 12B in a wound state, the blade 20 is guided by the chamfered portion 29, the diameter of which is smoothly reduced, and the assembling workability is improved.

In the above-mentioned embodiment, the rotary mechanism is applied as the compression mechanism section 3, but the compression mechanism section 3 is not limited to this, and the reciprocating type, the scroll type, or the near type. A fluid compressor equipped with a helical blade, which has been attracting attention (for example, Japanese Patent Application No. 2-1
No. 70268), and the configuration 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.

[0054]

As described above, according to the present invention, the blade is spirally wound around the rotary shaft of the horizontal compressor, and the blade is pivotally supported in the eccentric space chamber to be integrated with the rotary shaft. Since the blade is rotated and the lubricating oil is sucked up through the oil suction passage to supply oil to the compression mechanism section, the blade is the only additional component, and the simple construction that minimizes the necessary processing work. Therefore, it is possible to obtain high lubrication reliability of reliably sucking up the lubricating oil in the oil sump and supplying the lubricating oil, and the invention can be applied regardless of the type of the compression mechanism.

Further, according to the first aspect of the invention, since the eccentric pivotally supporting portion is provided in the central portion of the bearing tool and the pivotally supporting hole portions are provided adjacently on both sides of this, the effective supporting length of the bearing tool with respect to the rotary shaft is secured long. It is possible to reduce the surface pressure applied to the support end of the rotating shaft,
It is possible to suppress the occurrence of galling wear and improve reliability.

Further, according to the second invention, since the chamfered portion having an outer diameter larger than the outer diameter of the blade is provided along the peripheral edge of the pivot hole or the eccentric pivot portion on the side where the blade is inserted during assembly. Assembling work is facilitated and the number of steps can be reduced.

[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 embodiment.
(B) is a front view of a part of the sub bearing of the embodiment.

FIG. 3 is a vertical cross-sectional view of an oil supply device for a horizontal compressor according to another embodiment.

FIG. 4A is a vertical cross-sectional view of the auxiliary bearing of the same embodiment.
(B) is a front view of a part of the sub bearing of the embodiment.

FIG. 5 is a side view of a rotary shaft end and a blade.

FIG. 6 is an exploded side view of a rotary shaft end and a blade.

FIG. 7 is a vertical cross-sectional view of a main part of a horizontal rotary compressor, showing a conventional example.

[Explanation of symbols]

5 ... Oil sump, 1 ... Closed case, 3 ... Compression mechanism, 2 ...
Rotating shafts, 23a, 23b, 23 ... Pivot hole portions, 12A, 1
2B ... Bearing tool (auxiliary bearing), 21 ... Eccentric pivot support (eccentric pivot support hole), 26 ... Eccentric space chamber, 20 ... Blade, 22 ... Oil suction passage, 29 ... Chamfer.

Claims (2)

[Claims] 1. A horizontally installed type having a horizontally sealed case having an oil reservoir for lubricating oil on an inner bottom thereof, and a rotary shaft which is accommodated in the horizontally sealed case in a horizontal direction and which is connected to a compression mechanism section. In a compressor, a bearing having a pivot hole for rotatably supporting the rotary shaft, and a rotary shaft provided in the bearing adjacent to the pivot hole and eccentric to the center of the pivot hole An eccentric pivotal support portion in which an eccentric space chamber is formed between the peripheral surface and the bearing tool inner cavity, and a blade which is spirally wound around the rotating shaft and protrudes into the eccentric space chamber to rotate integrally with the rotating shaft, The eccentric space chamber has an opening at one end and an opening at the other end that is an oil suction passage immersed in the lubricating oil in the oil reservoir,
The eccentric pivot support is located at the center of the bearing, and the pivot support holes are adjacently provided on both sides of the eccentric pivot. 2. A horizontally installed type having a horizontally sealed case having an oil reservoir for lubricating oil on an inner bottom thereof, and a rotary shaft which is housed in the horizontally sealed case and which is connected to a compression mechanism section. In a compressor, a bearing having a pivot hole for rotatably supporting the rotary shaft, and a rotary shaft provided in the bearing adjacent to the pivot hole and eccentric to the center of the pivot hole An eccentric pivotal support portion in which an eccentric space chamber is formed between the peripheral surface and the bearing tool inner cavity, and a blade which is spirally wound around the rotating shaft and protrudes into the eccentric space chamber to rotate integrally with the rotating shaft, The eccentric space chamber has an opening at one end and an opening at the other end that is an oil suction passage immersed in the lubricating oil in the oil reservoir,
Oiling of a horizontal compressor characterized in that a chamfer having an outer diameter larger than the outer diameter of the blade is provided along the peripheral edge of the pivot hole or the eccentric pivot on the side where the blade is inserted during assembly. apparatus.