JPH05240170A - Fluid pump for enclosed compressor - Google Patents

Abstract

PURPOSE:To prevent the generation of an excessive flow rate even in high speed rotating area by providing an oil groove communicating with an oil feed hole in a rotating shaft from the outer surface of the rotating shaft and an oil passage allowing the oil groove to communicate with the discharge part of a fluid pump. CONSTITUTION:One end of an oil passage 121 provided in a cylinder 102 is allowed to communicate with an oil discharge chamber 110 and the other end is allowed to communicate with an auxiliary bearing 103 for supporting a rotating shaft 5. Further, in the inner part of the rotating shaft 5, oil grooves 122 one-side ends of which communicate with an auxiliary bearing 103 and the other ends of which communicate with the oil feed hole 52 are provided in several positions. The lubricating oil pressurized by the oil discharge chamber 110 flows into the auxiliary bearing 103 through the oil passage 121 and further flows into the oil feed hole 52 through the oil groove 122 from the outer surface of the rotating shaft to lubricate each nutating part of a compressing mechanism. Even when the rotating speed of an oil pump is raised, by the centrifugal force of the rotating shaft rotated at high speed together with it, a force is worked in the direction of returning the lubricating oil flowing into the oil groove 122 from the outside through the oil passage 121 to suppress an spondingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump for supplying oil to a sliding portion of a compression mechanism such as a scroll compressor and a rotary compressor, and a fluid pump used for other purposes.

[0002]

2. Description of the Related Art An example of a conventional oil pump is shown in FIGS. FIG. 3 is a vertical cross-sectional view of the scroll compressor. Inside the closed housing 8, a scroll compression mechanism C is housed in the upper part and an electric motor M is housed in the lower part, which are interlocked with each other via a rotary shaft 5. It is connected.

The scroll-type compression mechanism C allows the revolving motion of the fixed scroll 1, the orbiting scroll 2 and the orbiting scroll 2, but the rotation preventing mechanism 3 such as an Oldham link for preventing its rotation, the fixed scroll 1 and the electric motor M. It includes a frame 6 to be fastened, an upper bearing 71 that pivotally supports the rotary shaft 5, and the like.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface thereof.
A discharge port 13 and a discharge valve 17 that opens and closes the discharge port 13 are provided in the.

The orbiting scroll 2 comprises an end plate 21 and a spiral wrap 22 provided upright on the inner surface thereof. End plate 2
A drive bush 54 is rotatably fitted in a boss 23 provided upright on the outer surface of the lower part of 1 through a swivel bearing 73.
An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is rotatably fitted into a hole 55 formed in the drive bush 54.

A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and engaging them with each other while shifting the angle by 180 degrees.

The frame 6 is fixed to the hermetic housing 8, and the thrust portion 65 formed on the upper surface of the frame 6 and the back surface of the orbiting scroll 2 are in sliding contact with each other to support the orbiting scroll 2.

By driving the electric motor M, the rotary shaft 5, the eccentric pin 53, the drive bush 54, and the boss 2
The orbiting scroll 2 is driven via a revolving orbiting mechanism composed of 3 or the like, and the orbiting scroll 2 revolves on a circular orbit having an orbiting radius of revolution while being prevented from rotating by a rotation inhibiting mechanism 3.

Then, the gas enters the closed housing 8 through the suction pipe 82, passes through the gas passage 85, and the suction passage 15
Is sucked into the closed space 24 via the. Then, due to the orbiting movement of the orbiting scroll 2, the volume of the closed space 24 is reduced and the compressed space reaches a central portion while being compressed, and the discharge valve 17 is pushed open from the discharge port 13 to enter the discharge cavity 14, and from here. It is discharged to the outside through the discharge pipe 83.

An oil pump 10 is provided at the lower end of the rotary shaft 5.
0 is set. That is, the lower end of the rotary shaft 5 is provided with an eccentric shaft 101 which is eccentric with the rotary shaft 5 and extends downward.
The eccentric shaft 101 is surrounded by a cylinder 102. The cylinder 102 is supported by the closed housing 8 via a stay 116, and the lower portion of the rotary shaft 5 is supported by an auxiliary bearing 103 provided in the stay 116. The lower surface of the cylinder 102 is covered with a thrust plate 117, and the thrust plate 117 is fixed to the cylinder 102 together with a cover 111 that covers the thrust plate 117. The upper surface of the thrust plate 117 is in sliding contact with the lower end surface of the eccentric shaft 101 to support the thrust acting on the rotary shaft 5.

An annular rotor 104 is loosely fitted to the eccentric shaft 101, and the rotor 104 is pushed by the eccentric shaft 101 so that its outer peripheral surface abuts or comes close to the inner peripheral surface of the cylinder 102. The cylinder chamber 105 is limited.

Both ends of a blade 108 are slidably fitted in a slot 106 formed in the inner peripheral surface of the cylinder 102 and a slot 107 formed in the outer peripheral surface of the rotor 104, and the rotor causes the blade 108 to slide. The rotation of 104 is prevented, and the cylinder chamber 105 is partitioned into an oil suction chamber 109 and an oil discharge chamber 110.

Thrust plate 117 and cover 111
The oil absorption chamber 109 is provided in the closed housing 8 with an oil reservoir 8 at the bottom.
1 is provided with a suction passage 112, and an oil discharge chamber 110 is provided with a discharge passage 113 communicating with an oil supply hole 52 formed inside the eccentric shaft 101 and the rotary shaft 5.

When the rotating shaft 5 is driven by the electric motor M, the eccentric shaft 101 makes an eccentric rotational movement in the direction of the arrow shown in the figure. Then, the rotor 1 is pushed by the eccentric shaft 101.
The outer peripheral surface of 04 makes a revolution revolving motion while coming into contact with or close to one position on the inner peripheral surface of the cylinder 102.

Then, as the volume of the oil absorption chamber 109 increases, the lubricating oil stored in the oil sump 81 at the bottom of the closed housing 8 is introduced into the oil absorption chamber 109 through the suction passage 112, while the drained oil is discharged. As the volume of the chamber 110 decreases, the lubricating oil in the oil discharge chamber 110 is pressurized and the discharge passage 113
Through the eccentric shaft 101 and the oil supply hole 52 of the rotary shaft 5.
Is discharged to. Then, the lubricating oil lubricates the auxiliary bearing 103, the upper bearing 71, the eccentric pin 53, and the orbiting bearing 73 through the oil supply hole 52, and the chamber formed between the orbiting scroll 2 and the frame 6 through the oil supply hole 52. After lubricating the sliding portion such as the thrust portion 65 and the rotation preventing mechanism 3 through 61, the oil groove 66 and the like, the oil is stored in the oil sump 81 through the oil drain hole 62.

[0016]

In the above-mentioned conventional oil pump, the amount of oil supply increases as the rotation speed of the rotary shaft 5 increases, so that there is a problem that power loss increases at high speed rotation. It was

Further, when the amount of the lubricating oil supplied to the thrust portion 65 increases, the surplus lubricating oil droplets that lubricate the thrust portion 65 are sucked into the closed space 24 along with the gas flowing through the gas passage 85 and the suction passage 15. As a result, the amount of oil rise (which means the amount of lubricating oil contained in the discharge gas) increases, and as a result, the heat exchanger of the refrigeration system is contaminated and its heat exchange performance deteriorates. There is a problem that the amount of lubricating oil that remains is increased and the oil level in the oil sump 81 is lowered, so that the lubricating oil is no longer sucked into the oil pump 100.

In view of the above circumstances, it is an object of the present invention to provide a fluid pump provided with means for suppressing an increase in supplied fluid such as the amount of oil supplied during high speed rotation.

[0019]

As a means for solving the above-mentioned problems, the present invention is connected to the lower end of a vertical rotating shaft for driving a compression mechanism housed in a hermetic housing, and hermetically sealed by the rotary motion of the rotating shaft. A fluid pump of a hermetic compressor for sucking lubricating oil or the like stored in a bottom portion of a housing and supplying the lubricating oil or the like to a sliding portion of the compression mechanism through an oil supply hole vertically extending in the rotating shaft, A fluid pump of a hermetic compressor, comprising: an oil groove communicating with the oil supply hole of the rotary shaft from the outer surface of the rotary shaft; and an oil passage communicating with the oil groove and a discharge portion of the fluid pump. Is what you are trying to do.

Here, the oil supply hole, the oil groove, and the oil passage include passage of a fluid other than oil.

[0021]

Since the present invention is constructed as described above, it has the following actions.

That is, an oil groove communicating from the outer surface of the vertical rotating shaft for driving the fluid pump of the hermetic compressor to the internal oil supply hole, and an oil passage connecting the oil groove and the discharge portion of the fluid pump. Since the lubricating oil discharged from the fluid pump passes through the oil passage, passes through the oil groove, and enters the oil supply hole, the force that attempts to enter the oil groove by the centrifugal force due to the rotation of the rotating shaft in the oil groove, That is, the discharge force of the fluid pump is reduced, and the flow rate entering the oil supply hole does not increase.

Even if the rotational speed of the rotary shaft increases and the discharge pressure increases, the centrifugal force of the rotary shaft also increases in proportion to the square of the rotational speed per unit time. It is suppressed even in the high speed rotation range of the shaft, and an excessive flow rate does not occur.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1, 2 and 4 (also used as a conventional example). FIG. 1 is a sectional view showing a main part of the oil pump of this embodiment.

An oil passage 121 is bored in the cylinder 102. One end of the oil passage 121 communicates with the oil discharge chamber 110 and the other end communicates with an auxiliary bearing 103 that supports the rotary shaft 5. Furthermore, one end of the rotary shaft 5 communicates with the auxiliary bearing 103 and the other end communicates with the oil supply hole 5
The oil groove 122 communicating with 2 is provided at several places.

Other configurations are the same as those of the conventional example shown in FIG. 3, and corresponding members are designated by the same reference numerals.

Then, the lubricating oil pressurized in the oil discharge chamber 110 flows into the auxiliary bearing 103 through the oil passage 121 to lubricate the auxiliary bearing 103, and further the rotary shaft 5 fitted in the auxiliary bearing 103 is inserted. The oil enters the oil supply hole 52 from the outer surface through the oil groove 122, and lubricates each sliding portion of the compression mechanism C from there.

Thus, the lubricating oil flowing from the outer surface of the rotary shaft 5 into the oil supply hole 52 through the oil groove 122 flows in a direction against the centrifugal force generated by the rotation of the rotary shaft 5, so that the oil pump 100 is rotated. Refueling volume is reduced,
Power loss is reduced.

In particular, since the centrifugal force is proportional to the square of the number of revolutions, as shown in the lubrication characteristic diagram of FIG. 2, it is possible to suppress the increase tendency of the amount of lubrication at the time of high speed rotation as compared with the conventional case. The amount of rise can be reduced.

As described above, according to this embodiment, even if the number of rotations of the oil pump increases, the centrifugal force of the rotating shaft 5 that rotates at a high speed causes the centrifugal force of the rotating shaft 5 from the outside to pass through the oil passage 121 and the oil groove 1
Since a force acts in the direction of pushing back the lubricating oil that is about to enter 22 and as a result, the increase in the amount of oil rise is suppressed,
There is a corresponding reduction in power loss.

Further, as a result, there is an advantage that the problem that the increase in the amount of lubricating oil contaminates the heat exchanger of the refrigeration system and deteriorates the heat exchange performance is solved.

Further, there is an advantage that a large amount of lubricating oil is retained in the refrigerating apparatus and the oil level in the oil reservoir is lowered, so that it becomes difficult to suck the lubricating oil into the oil pump.

Although the present embodiment has been described with reference to an example of an oil pump for lubricating oil, the present invention is not limited to this, and a fluid other than oil is supplied for purposes other than lubrication. It may be a device used for the purpose.

[0034]

Since the present invention is constructed as described above, it has the following effects.

That is, according to the present invention, the lubricating oil discharged from the oil pump is made to flow from the outer surface of the rotating shaft into the oil supply hole of the shaft axis, so that the lubricating oil resists the centrifugal force generated by the rotation of the rotating shaft. Since it flows in the same direction, it is possible to suppress an increase in the amount of oil supply when the rotary shaft rotates at high speed, and as a result, it is possible to reduce power loss and
The amount of oil rise can be reduced.

Further, by reducing the oil rise amount, the problem that the excessive lubricating oil conventionally pollutes the heat exchanger of the refrigerating apparatus and deteriorates the heat exchange performance is solved.

Further, since there is no excessive oil rise, there is no problem that the lubricating oil is unevenly distributed in the refrigerating apparatus, the oil level in the oil sump is lowered, and the suction to the oil pump is reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of an oil pump according to an embodiment of the present invention,

FIG. 2 is a comparative diagram showing the lubrication characteristics of the above-described embodiment and a conventional example,

FIG. 3 is a vertical sectional view of a scroll compressor using a conventional example,

FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 (however, it is also used as a drawing of the above embodiment).

[Explanation of symbols]

 5 rotary shaft 8 hermetic housing 52 oil supply hole 100 oil pump 110 oil discharge chamber 121 oil passage 122 oil groove C compression mechanism

Claims (1)

[Claims] 1. A lower end of a vertical rotating shaft for driving a compression mechanism housed in a hermetically sealed housing,
Due to the rotational movement of the rotary shaft, the lubricating oil or the like stored in the bottom of the hermetically sealed housing is sucked and supplied to the sliding portion of the compression mechanism through the oil supply hole vertically extending in the rotary shaft. The fluid pump comprises an oil groove communicating with an oil supply hole in the rotary shaft from an outer surface of the rotary shaft, and an oil passage communicating the oil groove with a discharge portion of the fluid pump. Fluid pump for hermetic compressor.