JPH05302580A - Supply oil pump device for compressor - Google Patents

Abstract

PURPOSE:To moderate tumbling a roller by interposing an elastic seal member between the roller and a rotary shaft rotated in a cylinder, in an oil pump which is provided in a lower end of the rotary shaft to pump up oil, stored in the bottom part in a closed vessel, supplied to a lubricating part. CONSTITUTION:A scroll compressor is formed by respectively arranging a scroll compression element J4 in the upper part and a compression element 5 for driving this compression element 11 through a rotary shaft 7 in the lower part, in a closed vessel 1. An oil pump 24 is mounted on a connecting cylinder 31 provided in a lower end of the rotary shaft 7. This oil pump 211 is formed of constitution such that a roller 28 of building a vane 30 possible to advance/ retract in a radial direction to bring its point end part into slide contact with an internal wall of a cylinder 27 is rotatably housed in the cylinder 27 fixed to a pump housing 26. A ring-shaped elastic seal member 33 is interposed between the external periphery of the roller 28 and the internal periphery of the connecting cylinder 31, thus to permit displacement of the center from the rotary shaft 7 of the roller 28 by the elastic seal member 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply pump device for a compressor.

[0002]

2. Description of the Related Art A conventional oil supply pump device for a compressor is constructed as shown in, for example, Japanese Patent Laid-Open No. 63-90685. Here, a conventional example will be described with reference to this publication. 5 to 7, an upper frame 51 and a lower frame 52 are provided at upper and lower positions in the closed container 50, and a compression element 55 composed of a fixed scroll 53 and an orbiting scroll 54 is supported on the upper frame, and An electric element 56 whose rotation speed is variable by frequency conversion is supported between the upper frame 51 and the lower frame 52, while the electric element and the compression element are rotatably supported by the upper frame 51 and the lower frame 52. Axis 5
7, and the oscillating scroll 5 of the compression element 55 is rotated by the rotation of the rotary shaft 57 accompanying the driving of the electric element 56.
4 is revolved around the fixed scroll 53, and the refrigerant gas is compressed by these scrolls.

Further, an oil pump 59 facing the bottom oil sump 58 in the closed container 50 is attached to the lower end of the rotary shaft 57, and the oil in the oil sump 58 is passed through this oil pump to the axial center of the rotary shaft 57. Refueling passage 60 formed through the inside
The oil is supplied from this oil supply passage to the bearings of the rotating shaft 57 and the frames 51 and 52, the bearings of the rotating shaft 57 and the orbiting scroll 54, and the like.

The oil pump 59 has a pump housing 62 fixedly supported on the lower end surface of the lower frame 52 via fixing bolts 61 and an oval pump chamber 63, and the pump housing 62 is provided only in the minor axis direction. A cylinder 64 supported reciprocally, a roller 66 fixed below the rotary shaft 57 via a connecting cylinder 65, and eccentrically rotated in the pump chamber 63 of the cylinder 63, and lower surfaces of the roller and the cylinder 63. And a pump spacer 67 fixed by a fixing bolt 61.

The pump housing 62 is integrally provided with a mounting piece 69 extending outward in the radial direction at the upper end of the tubular body 68. The mounting piece is fixed to the lower frame 52 with a fixing bolt 61, and is attached to the tubular body 68. The extension pieces 70 extending downward are formed to face each other, and guide grooves 71 are provided at the lower ends of the extension pieces.

The cylinder 64 has a semi-circular portion on each side in the lateral direction, and forms a laterally elongated oval pump chamber 63 in which these semi-circular portions are connected by a straight line portion. The support pieces 72 are integrally formed on the outer peripheral portion of the cylinder 64 in the minor axis direction of the pump chamber 63, and these support pieces are interposed in the guide groove 71 provided in the extension piece 70 of the pump housing 62. The guide groove reciprocates the cylinder 64 only in the minor axis direction of the pump chamber 63.

An eccentric portion 73, which is eccentric to the axis of the rotary shaft 57, is integrally formed at the lower end of the roller 66, and this eccentric portion is interposed in the pump chamber 63 of the cylinder 64, and inside the pump chamber. By eccentrically rotating the eccentric portion 73, while moving the cylinder 64 in the minor axis direction of the pump chamber 63, the eccentric portion 73 is reciprocated in the major axis direction of the pump chamber 63 to perform oil suction compression. Eccentric part 73
At the bottom end surface of the
While providing the discharge ports 75 on the outer peripheral surface,
The suction passage 73 communicates with the inside of the roller 66, and the suction passage 73 extends radially outward from the lower side, and the discharge port 75 communicates with the suction passage 73. The suction passage 73 extends upward from the lower side to the oil supply passage 60 of the rotating shaft 57. A discharge passage 76 that opens is formed.

In the compressor oil supply pump device of this structure, by using the oil pump 59 as a positive displacement pump element, the amount of oil supply in the high frequency region and the low frequency region changes proportionally,
Compared to a centrifugal pump, in which the amount of refueling changes in proportion to the square of the number of revolutions, the amount of refueling does not become extremely large in the high frequency range.

[0009]

However, since the oil pump 59 fixes the roller 66 to the rotating shaft 57 by the connecting cylinder 65 and supplies the oil in the oil sump 58 to the sliding surface of each bearing, the rotating shaft 59 has the following structure. Roller 6 when 57 falls
6 also falls down and the clearance between the cylinder 64 and the cylinder 64 changes, the sliding resistance between the cylinder and the roller increases, and a sufficient amount of oil cannot be supplied due to a decrease in the excluded volume. was there.

The present invention solves the above problems.
An object of the present invention is to provide a compressor oil supply pump device in which a roller of an oil pump is attached to a rotary shaft via an elastic seal member, and the tilt of the roller can be alleviated against the tilt of the rotary shaft. is there.

[0011]

According to the present invention, a compression element, an electric element, and a rotary shaft for transmitting the rotational force of the electric element to the compression element are housed in a closed container having an oil sump at the bottom. In an oil supply pump device of a compressor in which an oil pump for supplying oil in an oil reservoir to a sliding portion of the compression element is attached to a lower end of a shaft, the oil pump is rotated together with a cylinder and a rotary shaft in the cylinder. It is composed of a roller, and an elastic seal member is interposed between the roller and the rotary shaft.

[0012]

The present invention is constructed as described above,
The roller of the oil pump is displaced with respect to the rotating shaft by an elastic seal member so that the inclination of the roller of the oil pump does not narrow the clearance of the sliding surface with the cylinder even if the rotating shaft falls.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention. FIG. 2 is an enlarged sectional view of an essential part showing a state in which an oil pump is attached to the rotary shaft of the present invention. FIG. 3 is an enlarged cross-sectional view of essential parts showing a state of the oil pump of the present invention during operation. FIG. 4 is a cross-sectional view of the oil pump of the present invention.

Reference numeral 1 denotes a closed container having an oil sump 2 at the bottom thereof, in which a main frame 3, a scroll compression element 4 arranged on the upper side of the main frame, and a lower side of the main frame 3 are arranged. Electric element 5, an auxiliary frame 6 arranged below the electric element, and a rotational compression force of the electric element 5 rotatably supported by these frames.
The rotating shaft 7 for transmitting to is stored.

The scroll compression element 5 is a fixed scroll 8
And an orbiting scroll 9. The fixed scroll 8 is pressed against the inner wall of the closed container 1 to partition the inside of the container into a high-pressure chamber 10 and a low-pressure chamber 11, and a disk-shaped end plate 12 and an annular wall 13 projecting from one end of the end face of the end plate. , A spiral wrap 14 which is surrounded by this annular wall and is erected on the end plate 12 and which has an involute shape or a curve approximate to this.
It consists of and. The fixed scroll 8 has the annular wall 13 and the wrap 14 protruding downward.

The orbiting scroll 9 has a disk-shaped end plate 15,
A spiral wrap 16 formed of an involute shape or a curve approximate to this, which is erected on one surface of the end plate,
It is configured with a boss 17 protruding in the center of the other surface of the end plate 15. And the orbiting scroll 9 is a wrap 16
With the protruding direction of the above as the upper side, this wrap is engaged with the wrap 14 of the fixed scroll 8 and the plurality of compression spaces 1
8 forming.

The end plate 14 of the fixed scroll 8 is provided at its center with a discharge hole 19 communicating with the compression space 18.

Reference numeral 20 denotes a swing link which connects the rotary shaft 7 and the orbiting scroll 9. The swing link 9 has an eccentric hole 22 into which a drive pin 21 provided at the tip of the rotary shaft 7 is fitted. And a boss hole 23 into which the boss 17 is fitted.

A scroll compression element 5 is provided at the center of the rotary shaft 7.
Each of the sliding parts of the boss hole 2 is provided with an oil supply hole 25 for pumping the oil in the oil storage part 2 by an oil pump 24 described later to supply the oil.
3 is opened. The center of the oil supply hole is aligned with the axis of the rotary shaft 7.

The oil pump 24 is fitted in a pump housing 26 fixed to the auxiliary frame 6, a cylinder 27 fixed to this pump housing, a roller 28 arranged in this cylinder, and a recess 29 of this roller. A cylindrical vane 30 that contacts the inner wall of the cylinder 27
A connecting cylinder 31 fixed to the lower end of the rotating shaft 7, a pin 32 for locking the roller 28 to the connecting cylinder and rotating the rotating shaft together with the rotating shaft 7, an outer circumference of the roller 28 and an inner circumference of the rotating shaft 7. It is composed of a ring-shaped elastic seal member 33 sandwiched between and, and an end plate 34 attached to the lower end of the cylinder 27. The end plate 34 is provided with an oil suction hole 35 for guiding the oil of the oil reservoir 2 into the cylinder 27 and a guide groove 36 for guiding the oil pressurized in the cylinder 27. The roller 28 is provided at the center with an oil supply passage 37 that connects the lead-out groove 36 of the end plate 34 and the oil supply hole 25 of the rotary shaft 7.

A joint means 38 revolves the orbiting scroll 9 with respect to the fixed scroll 8 without rotating, and this joint means is formed by an Oldham joint arranged between the main frame 3 and the orbiting scroll 9. Has been done.

A suction pipe 39 is attached to the closed container 1, and the suction pipe communicates with the low pressure chamber 11 in the closed container 1. Reference numeral 40 is a suction passage formed in the main frame 3 to guide the refrigerant in the low pressure chamber 11 to the scroll compression element 5. 41
Is a discharge pipe attached to the upper wall of the closed container 1, and the discharge pipe communicates with the high-pressure chamber 10 in the closed container 1.

In the scroll compressor constructed as described above, when the electric element 5 is rotated, its rotational force is transmitted to the orbiting scroll 9 via the rotary shaft 7. That is, the orbiting scroll 9 is driven by inserting the boss 17 into the boss hole 23 of the swing link 20 attached to the rotating shaft 7, and the joint means 38 does not rotate relative to the fixed scroll 8 but revolves on a circular orbit. To be made. Then, the fixed scroll 8 and the orbiting scroll 9 gradually reduce the compression space 18 formed by these scrolls from the outside to the inside, flow into the low pressure chamber 11 from the suction pipe 39, and flow into the low pressure chamber 11. The refrigerant flowing from the suction passage 40 to the scroll compression element 4 is compressed. The compressed refrigerant is discharged from the discharge hole 19 provided in the end plate 12 of the fixed scroll 8 through the discharge chamber 40 to the outside of the closed container 1 through the high pressure chamber 10.

Each sliding portion of the scroll compression element 4 is lubricated by forcibly supplying the oil in the oil reservoir 2 by the oil pump 24. That is, the oil pump 24 sucks the oil in the oil sump 2 into the cylinder 27 from the oil suction hole 35 of the end plate 34 by the rotation of the roller 28 in the cylinder 27 by the rotating shaft 7 and into the recess 29 of the roller 28. The oil is pressurized by the vane 30 which is fitted and rotates together with this roller, and is supplied from the outlet groove 36 through the oil supply passage 37 of the roller 28 into the oil supply hole 25 of the rotary shaft 7, and the centrifugal pump action of this oil supply hole is provided. Is supplied to each sliding portion of the scroll compression element 4.

The roller 28 of the oil pump 24 is the rotary shaft 7
The pin 31 is locked so as to rotate together, and the elastic seal member 33 allows the shaft center to shift, so that even if the rotary shaft 7 tilts, it does not follow the rotary shaft and tilt. The clearance between the cylinder 27 and the cylinder 27 is prevented from becoming extremely narrow. The oil pump 24 suppresses an increase in sliding resistance between the cylinder 27 and the roller 28, so that the oil supply amount can be adjusted to an amount according to the rotation speed of the electric element 5.

Further, the oil pump 24 has a ring-shaped elastic seal member 33 between the outer periphery of the roller 28 and the inner periphery of the rotary shaft 7.
By sealing with, the oil that is pressurized by the cylinder 27 and the roller 28 and supplied into the oil supply hole 25 of the rotary shaft 7 does not return directly to the oil reservoir 2.

[0028]

As described above, according to the present invention, the compression element, the electric element, and the rotary shaft for transmitting the rotational force of the electric element to the compression element are housed in a closed container having an oil reservoir at the bottom. In an oil supply pump device of a compressor in which an oil pump for supplying oil in an oil reservoir to a sliding portion of the compression element is attached to a lower end of the rotary shaft, the oil pump is provided with a cylinder and a rotary shaft in the cylinder. Since the elastic seal member is interposed between the roller and the rotary shaft, the clearance between the cylinder of the oil pump and the roller can be made constant regardless of the tilt of the rotary shaft, and the oil The supply amount can be adjusted according to the rotation speed of the electric element.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing a state in which an oil pump is attached to the rotary shaft of the present invention.

FIG. 3 is an enlarged sectional view of an essential part showing a state of the oil pump of the present invention during operation.

FIG. 4 is a cross-sectional view of the oil pump of the present invention.

FIG. 5 is a sectional view of a conventional scroll compressor.

FIG. 6 is a sectional view of a main part of a conventional oil pump.

FIG. 7 is a bottom view of a conventional oil pump.

[Explanation of symbols]

 1 Airtight Container 2 Oil Reservoir 3 Main Frame 4 Scroll Compression Element 5 Electric Element 7 Rotating Shaft 24 Oil Pump 26 Pump Housing 27 Cylinder 28 Roller 33 Elastic Seal Member

Claims (1)

[Claims] 1. A compression element, an electric element, and a rotary shaft for transmitting the rotational force of the electric element to the compression element are housed in a closed container having an oil sump at the bottom, and the oil sump is provided at the lower end of the rotary shaft. In an oil supply pump device of a compressor equipped with an oil pump for supplying oil to a sliding portion of the compression element, the oil pump has a cylinder and a roller that rotates together with a rotation shaft in the cylinder, An oil supply pump device for a compressor, wherein an elastic seal member is interposed between a roller and a rotary shaft.