JP3135657B2 - Oil compressor for horizontal compressor - Google Patents

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 an improvement in an oil supply device for supplying lubricating oil to a compression mechanism.

[0002]

2. Description of the Related Art Conventionally, a horizontal compressor has been known as a compressor for an air conditioner, for example. In this type of horizontal compressor, the sealed case is of the horizontal type,
Naturally, the rotating shaft housed inside this extends in the horizontal direction. An oil reservoir for lubricating oil is formed at the inner bottom of the sealed case, and a lubricating device that sucks up the lubricating oil with the rotation of the compressor and supplies the lubricating oil to a compression mechanism provided on the rotary shaft. Be provided.

[0003] In a normal vertical compressor, a rotating shaft extends in a vertical direction, and a lower end thereof is immersed in lubricating oil in an oil reservoir formed in an inner bottom of a closed case.
Therefore, the lubricating device can easily and surely suck up the lubricating oil with the rotation of the rotating shaft and supply the lubricating oil to the compression mechanism.

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

FIG. 7 shows that the present applicant filed a Japanese Utility Model Application No. 62-7467.
Fig. 2 is an example of an oil supply device in a horizontal rotary compressor filed in Japanese Patent Application No. 2; In the figure, reference numeral 1 denotes a horizontal case,
Is a rotating shaft that extends and is accommodated in the horizontal direction, 3 is a rotating shaft 2
Is a compression mechanism provided at one end, and 4 is an electric motor provided at the other end.

Here, the compression mechanism 3 is of a rotary type. The compression mechanism 3 is provided with an oil supply device 6 that sucks and supplies lubricating oil from an oil reservoir 5 formed at the inner bottom of the closed case 1.

That is, reference numeral 7 denotes a partition plate for partitioning the inside of the closed case 1 to the left and right.
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 supplied to the blade accommodating chamber 10, the oil supply pipe 1
The oil is supplied to the oil supply hole 13 provided in the sub bearing 12 via the first bearing 1, and is supplied to the pivotal support surface of the rotary shaft 2. Since a 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 3 via the oil groove 14. Become.

As described above, the oil supply device 6 effectively utilizes the differential pressure in the sealed case 1 due to the compression action, and the blade 1 provided in the rotary compression mechanism 3.
Thus, highly reliable lubrication can be obtained in which operation 5 is also used as lubrication operation.

[0010]

However, the lubricating apparatus 6 requires the above-mentioned partition plate 7 for partitioning the inside of the sealed case 1 and additional parts such as manufacturing a curved body forming the oil suction passage 8. And the device configuration becomes large. In addition, since the operation of the blade 15 is used, there is a problem that it cannot be adopted with a structure other than the rotary compressor.

In addition, various lubricating devices for a horizontal compressor have been developed. However, in any case, there are problems such as a complicated structure and a high lubricating reliability cannot be obtained. Is desired.

The present invention has been made in view of the above circumstances, and has as its object a simple configuration in which additional components are kept to a minimum, without being limited to the type of compression mechanism. , High lubrication reliability, and minimizes the surface pressure applied to the support end of the rotating shaft, and provides smooth pivoting characteristics without galling and facilitates assembly work.
It is another object of the present invention to provide a horizontal compressor oil supply device capable of reducing man-hours .

[0013]

[0014]

[0015]

[Means for Solving the Problems] In order to satisfy the above-mentioned purpose
SUMMARY OF THE INVENTION The present invention provides a horizontal compression type including a horizontally sealed case having an oil reservoir for lubricating oil on an inner bottom thereof, and a rotating shaft housed horizontally in the sealed case and connecting a compression mechanism. A bearing having a pivot hole for rotatably supporting the rotating shaft, and an upper end portion of the pivot hole provided adjacent to the pivot hole in the bearing. With
An eccentric pivot portion in which an eccentric space is formed between the peripheral surface of the rotary shaft and the bore of the bearing by projecting the lower end portion eccentrically from the center of the pivot hole, and spirally wound around the rotary shaft. A blade that is mounted and protrudes into the eccentric space chamber and rotates integrally with the rotation shaft, and a portion adjacent to the eccentric pivot portion and the pivot hole portion
And an opening at one end thereof on the peripheral surface at the lower end and an opening at the other end comprising an oil suction passage immersed in the lubricating oil of the oil reservoir, and a pivot hole on the side where the blade is inserted during assembly. A chamfer having an outer diameter larger than the outer diameter of the blade is provided along a peripheral edge of the end surface of the portion or the eccentric pivot.

[0016]

[0017]

According to the present invention , the blade rotates with the rotation of the rotating shaft, the eccentric space chamber becomes negative pressure, and lubricating oil is sucked up through the oil sucking path whose position is limited , and the lubricating oil is pushed out by the blade. Thus, oil is supplied to the sliding portion of the compression mechanism. At the time of assembling these components, the blades are inserted and fitted to the bearing while the blades are wound around the rotating shaft. At this time, the blade is guided in contact with a chamfered portion provided on the blade insertion side end surface of the pivot hole or the eccentric pivot, and its diameter is reduced smoothly without difficulty, and the blade is mounted on the eccentric space chamber.

[0018]

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 3 as described above with reference to FIG. Alternatively, it may be a reciprocating type, or a scroll type which tends to be used frequently recently.

The point is that the rotary shaft 2 extending in the horizontal direction is accommodated in the horizontally sealed case 1 and a compression mechanism provided at one end of the rotary shaft 2 may be used. Therefore,
The other end of the rotating shaft 2 is, of course, provided with the electric motor section as described above.

One end of the rotary shaft 2 is rotatably supported by an auxiliary bearing 12A as a bearing. The auxiliary bearing 12A
Is provided directly or indirectly on the side surface of the sealed case 1. Here, the details are omitted.

Oil supply device K provided in such a compressor
Is a spiral blade 20 provided at the end of the rotating shaft 2.
And an eccentric pivot hole 21 as an eccentric pivot that is a bore provided in the auxiliary bearing 12A that accommodates the blade 20.
And an oil suction passage 22.

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

More specifically, an eccentric pivot hole 21 is provided at the center of the auxiliary bearing 12A, and one pivot hole 23a is provided on one side and the other pivot hole 23b is provided on the other side. It is provided adjacently.

Each of the pivot holes 23a and 23b pivotally supports the end of the rotary shaft 2 in a freely rotatable manner. The axis of the eccentric pivot hole 21 communicates with a position eccentric by a predetermined amount e from the axis of the pivot holes 23a and 23b.

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

The oil guide groove 30 is provided only in the other pivot support hole 23b.
Is provided. The groove 30 has a cross section provided along the axial direction in a direction in which the eccentric pivotal support hole 21 is eccentric with respect to the pivotal support hole 23b, that is, at a position opposed to the upper end portion W via the axis. It is a V-shaped groove.

Instead of the oil guide groove 30, a groove having a similar shape may be provided on the peripheral surface side of the rotating shaft 2. However, in this case, since it is provided at a very small portion in the axial direction, it is difficult to set the position.

The upper end of the oil supply hole 25 is opened at a portion adjacent to one of the pivot holes 23a and the eccentric pivot hole 21 and at the lower end peripheral surface where the amount of eccentricity e is maximized. . This is provided in the vertical direction, and its lower end is opened at the lower peripheral surface 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 in a state where the rotary shaft 2 is pivotally supported by the pivot holes 23a and 23b. The eccentric space chamber 26 is located between the peripheral surface of the eccentric pivot hole 21 and the peripheral surface of the rotary shaft 2.
Is formed.

The upper end of the oil suction pipe 27 is inserted into the oil supply hole 25. The lower end of the oil suction pipe 27 always extends so as to be immersed in the lubricating oil collected in the oil reservoir 5 at the inner bottom of the sealed case 1. The oil suction pipe 27 and the oil supply hole 25 constitute the oil suction path 22.

FIG. 5 shows a state in which a blade 20 is wound around a spiral groove 28 provided at the end of the rotating shaft 2. The spiral groove 28 is formed by winding at least two turns. The blade 20 is wound around the helical groove 28 and, as shown in FIG. 1, is pivotally supported by the eccentric pivot hole 21 of the auxiliary bearing 12A. The lower end protrudes from the peripheral surface of the rotating 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 the metal material, and the unbalance amount can be reduced. The thickness, the height, and the number of turns match the spiral groove 28 provided at the end of the rotating 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 holes 23a and 23b, and the outer diameter φ (d + 2e) of the blade 20 and the diameter φ (d) of the eccentric pivot hole 21
+ 2e).

As shown in FIGS. 1 and 2 again, here, along the peripheral end portion of the pivot hole 23b and in the auxiliary bearing 12A.
The chamfered portion 29 is provided only on the end face side. This chamfer 2
9 is machined with an inclination of 30 ° to 45 ° in cross section based on the periphery along the diameter of the pivot hole 23b. The outer diameter φD ₀ of the chamfered portion 29 on the end face side 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-described refueling device K,
The blade 20 is wound around the spiral groove 28 of the rotating 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 to a sub bearing before being attached to the predetermined portion. Attach to 12A.

Here, the end of the rotating shaft 2 is connected to the auxiliary bearing 12A.
To the pivotal support hole 23b on the end face side where the chamfered portion 29 is provided. From this state, the end of the rotating shaft 2 is
b, and further inserted through the eccentric pivot hole 21 into the other pivot hole 23a.

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

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

In addition, when the rotary shaft 2 is inserted, the blade 20
5 does not always protrude to the lower side of the rotating shaft 2 as shown in FIG. 5, but may protrude substantially uniformly along the upper side, one of the right and left sides, or the peripheral surface.

Regardless of the direction in which the blade 20 projects in any direction, since the end face outer diameter φD _{0 of} the chamfered portion 29 is larger than φ (d + 4e), it goes without saying that smooth guidance is provided. Absent.

In a normal state in which the blade 20 is located in the eccentric space 26, the rotating shaft 2 has the two eccentric holes 23a, 23a.
b is rotatably supported by b. Therefore, a sufficient supporting length can be secured, and the surface pressure applied to these supporting ends due to the rotation of the rotating shaft 2 is reduced, so that galling does not occur.

In the horizontal compressor provided with the oil supply device K configured as described above, the compression action is performed by the compression mechanism 3 as the rotary shaft 2 rotates. Then, the blade 20 wound around the end of the rotating shaft 2
Rotates integrally with the rotating shaft 2 in the eccentric space 26.

In other words, the pivot holes 23a, 23b
And the upper end W of the eccentric pivot hole 21 coincides.
These upper end portions W and the upper end portions of the blades 20 are on the same line, and this is used as a partition line so that the blade 20
6 is divided into a plurality of closed chambers corresponding to the number of windings.

Then, 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 pivot hole 23b side.

A plurality of closed chambers partitioned by the blades 20, which are the eccentric space chambers 26, are in a negative pressure state, and an oil suction pipe 27 communicating therewith sucks up the lubricating oil in the oil reservoir 5.
The lubricating oil is guided to the eccentric space chamber 26 through the oil supply hole 25, filled into 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 26 and is fed to the other pivot hole 23b. In particular, an oil guide groove 30 is provided here, and the lubricating oil is smoothly guided and passed, and is finally supplied to the compression mechanism.

Since the refueling is performed in accordance with the spiral movement of the blade 20, the operation is reliable and high refueling reliability is obtained. The only new component constituting the oil supply device is the blade 20. The spiral groove 28 is formed on the end of the rotary shaft 2 and the pivot hole 23 of the auxiliary bearing 12A is formed.
The eccentric pivot hole 21 may be provided between the a and 23b. It should be noted that the lubrication device Ka may be provided with the auxiliary bearing 12B as shown in FIGS. 3 and 4A and 4B.

The auxiliary bearing 12B has one pivot hole 23.
One eccentric pivot hole 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. The pivot hole 23 is wound around the rotary shaft 2 in an eccentric space 26 formed between the eccentric pivot hole 21 and the rotary shaft 2. Outer diameter φ
(D + 2e) blade 20 protruding, lubrication hole 2
5 is provided, and the oil suction passage 22 is formed in the same manner.

Then, a chamfered portion 29 is formed along a peripheral end of the end surface of the eccentric pivot hole 21 which is an end surface of the auxiliary bearing 12B.
Is provided. The outer diameter φD ₀ on the end face side is represented by φ (D + 4e)
It is exactly the same as in the above-mentioned embodiment that it is made larger.

Therefore, the blade 20 is connected to the spiral groove 28
When the blade 20 is assembled into the auxiliary bearing 12B in the state of being wound, the blade 20 is guided by the chamfered portion 29 to smoothly reduce the diameter, thereby improving the assembling workability.

In the above-described embodiment, the rotary mechanism is used as the compression mechanism 3. However, the present invention is not limited to this. Fluid compressors with helical blades, which have been attracting attention (for example, the present applicant has filed Japanese Patent Application No.
No. 70268), and the configuration is free. In short, the present invention can be applied to all refueling devices provided in a horizontal compressor. Various modifications can be made without departing from the scope of the present invention.

[0054]

As described above, according to the present invention, a blade is spirally wound around a rotating shaft of a horizontal compressor, and the blade is pivotally supported in an eccentric space chamber to be integrated with the rotating shaft. The blades are rotated to suck up the lubricating oil through the oil suction path and supply it to the compression mechanism, so the only additional component is the blade, which has a simple configuration that minimizes the required processing work. Yes , depending on the position setting of the oil suction path,
The lubricating oil in the oil sump is reliably sucked up and almost all
High lubrication reliability for supplying all the lubricating oil to the compression mechanism can be obtained, and the invention can be applied without being limited to the type of compression mechanism.

[0055]

[0056] Moreover, because provided a chamfer of larger outer diameter than the blade the blade outer diameter along the end face periphery of the pivot hole portion or eccentric pivot portion of the side that is inserted during assembly facilitates assembly work Nisumi, This has the effect of reducing man-hours.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an oil supply device of a horizontal compressor, showing one embodiment of the present invention.

FIG. 2A is a longitudinal sectional view of a sub bearing of the embodiment.
(B) is a front view of a part of the auxiliary bearing of the embodiment.

FIG. 3 is a longitudinal sectional view of an oil supply device of a horizontal compressor according to another embodiment.

FIG. 4A is a longitudinal sectional view of a sub bearing of the embodiment.
(B) is a front view of a part of the auxiliary bearing of the embodiment.

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

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

FIG. 7 is a longitudinal sectional view of a main part of a horizontal type rotary compressor showing a conventional example.

[Explanation of symbols]

5 ... oil reservoir, 1 ... closed case, 3 ... compression mechanism, 2 ...
Rotating shaft, 23a, 23b, 23 ... pivot hole, 12A, 1
2B: bearing (sub bearing), 21: eccentric pivot (eccentric pivot), 26: eccentric space, 20: blade, 22: oil suction passage, 29: chamfer.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 39/02 F04C 23/00-29/10 331 F04C 2/344 311

Claims (1)

(57) [Claims] 1. A horizontal type having a horizontally sealed case having an oil reservoir for lubricating oil at an inner bottom thereof, and a rotating shaft housed horizontally in the sealed case and connecting a compression mechanism. In the compressor, a bearing having a pivot hole for rotatably supporting the rotary shaft, and an upper end of the pivot hole provided on the bearing adjacent to the pivot hole are made to coincide with each other. And
An eccentric pivot portion of eccentricity space chamber is formed between the rotary shaft peripheral surface and the bearing member lumen by projecting the lower end eccentrically with monitor pivot hole unit center, helically to the rotation axis A blade that is wound and protrudes into the eccentric space and rotates integrally with the rotation shaft, and a portion adjacent to the eccentric pivot and the pivot hole
And an opening at one end thereof on the peripheral surface at the lower end, and an opening at the other end comprising an oil suction passage immersed in the lubricating oil of the oil reservoir, and a pivot hole on the side where the blade is inserted during assembly. An oil supply device for a horizontal compressor, wherein a chamfer having an outer diameter larger than an outer diameter of a blade is provided along a peripheral edge of an end portion or an eccentric pivot portion.