JPH05240175A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To regularly supply a proper quantity of lubricating oil to the thrust part of a scroll fluid machine and provide high reliability. CONSTITUTION:On an annular thrust part 65 formed on a frame, an annular oil feed groove 66 is provided in the middle position between the inner circumferential edge and the outer circumferential edge. On the outer surface of the end plate 21 of a turning scroll 2, a continuing groove 26 is provided. When the turning scroll 2 does revolution while arresting the rotation around its own axis, the continuing groove 26 dislocates while drawing a determined orbit to the thrust part 65 to continue the oil feed groove 66 to the inside chamber on the inner circumstance edge or block the oil feed groove 66 from the chamber. While the chamber is continued to the oil feed groove 66 by the continuing groove 26, the lubricating oil in the chamber is run from the continuing groove 26 to a flowing-out groove 67 through the oil feed groove 66 and discharged to the outside of the outer circumferential edge. At this time, the lubricating oil is pulled out to the thrust part 65 from the oil feed groove 66 to lubricate its surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine used as a compressor or an expander.

[0002]

2. Description of the Related Art A conventional scroll fluid machine, for example, a scroll compressor is constructed as shown in FIGS. 4 (a) and 4 (b). FIG. 1A is a vertical sectional view of the scroll compressor,
FIG. 3B is a plan view of the thrust portion.

As shown in FIG. 4A, the hermetically sealed housing 8
Inside, the scroll compression mechanism C is arranged in the upper part thereof, and the electric motor M is arranged in the lower part thereof, and these are interlockingly connected to each other via the rotary shaft 5. The electric motor M includes a rotor Ma and a stator Mb, the rotor Ma is fixed to the rotating shaft 5, and the stator Mb is a hermetically sealed housing 8.
It is fixed to.

The scroll compression mechanism C allows the revolving orbiting 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.
A frame 6 to which is fastened, an upper bearing 71 and a lower bearing 72 that support the rotating shaft 5, and the like. The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11, and the discharge port 1 is provided at the center of the end plate 11.
3 is provided.

The orbiting scroll 2 has an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21.
Drive bush 54 in the boss 23 that is erected on the outer surface of the
Is rotatably fitted through a swivel bearing 73, and an eccentric pin 53 protruding from the upper end of the rotary shaft 5 is rotatably fitted in 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 a hermetically sealed housing 8, and an annular thrust portion 65 formed on the upper surface of the frame 6 slidably contacts the outer surface of the orbiting scroll 2 to support the orbiting scroll 2. As shown in FIG. 4 (b), the thrust portion 65 is provided with an oil supply groove 62 extending radially.

By driving the electric motor M, the orbiting scroll 2 is driven via a revolving orbiting mechanism including a rotating shaft 5, an eccentric pin 53, a drive bush 54, a boss 23, etc., and the orbiting scroll 2 is rotated by a rotation preventing mechanism 3. While being prevented from rotating, it makes an orbital motion on a circular orbit with an orbital radius.

Then, the gas enters the sealed housing 8 through the suction pipe 82, and the gas is sucked into the sealed space 24 through the passage 85 and the suction passage 15. Then, as the volume of the sealed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed,
The check valve 17 is pushed open from the discharge port 13, enters the discharge cavity 14, and is discharged from there through the discharge pipe 83.

At the same time, the lubricating oil stored in the oil sump 81 at the bottom of the closed housing 8 is sucked up by the oil pump 51 provided in the lower portion of the rotary shaft 5, and the oil supply hole bored in the rotary shaft 5 is provided. It is supplied to the lower bearing 72, the upper bearing 71, the eccentric pin 53, and the slewing bearing 73 through 52 to lubricate them. Most of the lubricating oil that has lubricated the eccentric pin 53 and the slewing bearing 73 or has flowed through the hole 55 enters the chamber 61 formed in the center of the upper surface of the frame 6 and falls into the oil sump 81 via the oil discharge passage 62. However, a part of the lubricating oil enters from the chamber 61 into the plurality of oil supply grooves 66 formed in the thrust portion 65 from its inner end, and in the process of flowing radially therethrough, due to the revolution orbiting motion of the orbiting scroll 2. , And is drawn to the thrust portion 65 to lubricate the thrust portion 65. Then, the thrust portion 65 is lubricated or the oil supply groove 6 is
The lubricating oil that has passed through 6 flows out from the outer peripheral edge of the thrust portion 65 and lubricates the rotation prevention mechanism 3.

[0011]

In the conventional scroll fluid machine described above, when the lubricating oil is transiently supplied to the thrust portion 65, the excess lubricating oil droplets that lubricate the thrust portion 65 flow through the passage 85 and the suction passage 15. Since it is absorbed by the closed space 24 along with the flowing gas, 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 Worsening heat exchange performance,
The amount of lubricating oil accumulated in the refrigeration system increases and the oil sump 81
There is a problem that the oil level is lowered and the lubricating oil is not sucked into the oil pump 51. The present invention has been made in view of the above circumstances, and an object thereof is to provide a highly reliable scroll fluid machine that can always supply an appropriate amount of lubricating oil to the thrust portion.

[0012]

[Means for Solving the Problems]

(1) According to the present invention, a fixed scroll and an orbiting scroll, in which spiral wraps are erected on the inner surface of each end plate, are meshed with each other, and the orbiting scroll is caused to revolve while revolving while preventing its rotation. Lubricated to the thrust portion through a chamber formed in the center of the upper surface of the frame, which is slidably supported by a thrust portion formed in the frame, and which is provided in a rotation shaft for driving the orbiting scroll. In a scroll fluid machine that guides oil, an oil supply groove is provided in the thrust portion at an intermediate position between the inner peripheral edge and the outer peripheral edge, and an outflow groove facing the outer peripheral edge from the oil supply groove is provided. A conduction groove that periodically connects the oil supply groove and the inner side of the inner peripheral edge of the thrust portion with the orbiting motion of the orbiting scroll on the outer surface of the Is provided.

(2) Further, according to the present invention, the fixed scroll and the orbiting scroll in which spiral wraps are erected on the inner surface of each end plate are meshed with each other, and the orbiting scroll is prevented from rotating. An orbiting orbiting motion is carried out and slidably supported on a thrust portion formed on the frame, and a lubricating hole formed in a rotary shaft for driving the orbiting scroll is passed through a chamber formed in the center of the upper surface of the frame. In a scroll fluid machine in which lubricating oil is guided to the thrust portion, an oil supply groove is provided in the thrust portion at an intermediate position between the inner peripheral edge and the outer peripheral edge, and an inflow groove facing the inner peripheral edge from the oil supply groove is provided. On the outer surface of the end plate of the orbiting scroll, the refueling groove and the outside of the outer peripheral edge of the thrust portion are regularly provided along with the revolving orbiting motion of the orbiting scroll. It is characterized in that a conduction groove is provided to allow communication.

[0014]

In the invention of (1), when the orbiting scroll revolves while revolving while preventing its rotation, the conduction groove moves with respect to the thrust portion, and the inside of the oil supply groove and the inner peripheral edge of the thrust portion. And the inside of the inner peripheral edge are closed, and this is repeated periodically. Therefore, while the oil supply groove and the inside of the inner peripheral edge communicate with each other through the conduction groove, the lubricating oil flows through the oil supply groove.By setting this time appropriately, an appropriate amount of lubricating oil can be supplied to the thrust portion. Can be supplied.

In the invention of (2), the conduction groove moves in position with respect to the thrust portion in accordance with the orbiting movement of the orbiting scroll, so that the oil supply groove communicates with the outside of the outer peripheral edge of the thrust portion.
Alternatively, the oil supply groove and the outside of the outer peripheral edge are closed and this is periodically repeated. Therefore, while the lubrication groove and the outside of the outer peripheral edge communicate with each other through the conduction groove, the lubrication oil flows through the lubrication groove.By appropriately setting this time, an appropriate amount of lubrication oil can be supplied to the thrust portion. Can be supplied.

[0016]

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

FIG. 1 is a partial sectional view of a scroll compressor according to a first embodiment of the present invention, and FIG. 2 is a plan view of a thrust portion formed on a frame. Members corresponding to those of the conventional one shown in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

The annular thrust portion 65 formed on the frame 6 is provided with an annular oil supply groove 66 at an intermediate position between the inner peripheral edge and the outer peripheral edge thereof. An outflow groove 67 facing the hole is formed.

A conducting groove 26 is formed on the outer surface of the end plate of the orbiting scroll 2. The conduction groove 26 is arranged in consideration of the positions of the oil supply groove 66 and the chamber 61 facing each other.
That is, when the orbiting scroll 2 revolves around its axis while preventing its rotation, the conduction groove 26 moves along the trajectory of the thrust portion 65 while drawing the locus of the solid arrow shown in FIG. When located at the point shown, the oil supply groove 66 communicates with the inside of the inner peripheral edge, that is, the chamber 61. On the other hand, when located at the point shown by the broken line, the oil supply groove 66 and the chamber 61 are closed and this is periodically performed. Is to be repeated.

The rotation preventing mechanism 3 is provided on the outer surface of the end plate 21.
Since a key groove (not shown) slidably fitted with the key (not shown) is provided, this key groove can be used as the conduction groove 26 instead.

Thus, while the chamber 61 and the oil supply groove 66 are in communication with each other through the conduction groove 26, the lubricating oil in the chamber 61 inside the inner peripheral edge flows out from the conduction groove 26 through the oil supply groove 66. It flows through the groove 67 and is discharged to the outside of the outer peripheral edge.

In this process, the lubricating oil is drawn from the oil supply groove 66 to the thrust portion 65 along with the orbiting movement of the orbiting scroll 2 to wet the entire surface of the thrust portion 65 and lubricate it.

In this way, the position, number, size, etc. of the conduction groove 26 and the oil supply groove 66 are appropriately set so that the oil supply groove 66 communicates with the chamber 61 inside the inner peripheral edge via the conduction groove 26. By adjusting, it is possible to always supply an appropriate amount of lubricating oil from the oil supply groove 66 to the thrust portion 65, and it is possible to suppress an increase in the amount of oil rise due to excessive supply of lubricating oil. (Second embodiment)

FIG. 3 shows a thrust portion 65 according to the second embodiment of the present invention. The thrust portion 65 includes
An annular oil supply groove 66 is provided at an intermediate position between the inner peripheral edge and the outer peripheral edge.
Is formed, and an inflow groove 68 facing the outer peripheral edge from the oil supply groove 66 is formed.

On the outer surface of the end plate of the orbiting scroll 2, a conduction groove 27 shown by a broken line in the drawing is formed.
The position is moved with respect to the thrust portion 65 in accordance with the revolution revolving movement so that the oil supply groove 66 communicates with the outside of the outer peripheral edge and is closed.

Therefore, while the oil supply groove 66 and the outside of the outer peripheral edge are in communication with each other through the conduction groove 27, the lubricating oil in the chamber 61 flows from the inflow groove 68 through the oil supply groove 66 to the conduction groove 27. The oil is discharged to the outside of the outer peripheral edge, and in this process, as in the first embodiment, the lubricating oil is drawn from the inside of the oil supply groove 66 to the thrust portion 65 to lubricate it.

Thus, the oil supply groove 66 is provided through the conduction groove 27.
By adjusting the time for which the outside of the outer peripheral edge of the thrust portion 65 communicates with each other, it is possible to always supply an appropriate amount of lubricating oil from the oil supply groove 66 to the thrust portion 65.

[0028]

As described in detail above, according to the present invention, the thrust portion of the scroll fluid machine is provided with the oil supply groove at the intermediate position between the inner peripheral edge and the outer peripheral edge thereof, and the outflow groove facing the outer peripheral edge from the oil supply groove is provided. Further, a conduction groove is provided on the outer surface of the end plate of the orbiting scroll so that the oil supply groove and the inner side of the inner peripheral edge of the thrust portion are regularly communicated with each other along with the revolving orbiting motion of the orbiting scroll. By appropriately setting the time for the oil supply groove to communicate with the chamber inside the inner peripheral edge through the groove, it is possible to always supply an appropriate amount of lubricating oil to the thrust portion, and as a result, it is possible to obtain extremely high reliability. You can

Further, according to the present invention, the thrust portion is provided with an oil supply groove at an intermediate position between the inner peripheral edge and the outer peripheral edge thereof, and an inflow groove facing the inner peripheral edge from the oil supply groove, and the outer surface of the end plate of the orbiting scroll. On the other hand, since there is provided a conduction groove for periodically communicating the oil supply groove with the outside of the outer peripheral edge of the thrust portion in accordance with the revolution orbiting motion of the orbiting scroll, the oil supply groove and the outside of the outer peripheral edge are provided through the conduction groove. By appropriately setting the time for communicating with and, it is possible to always supply an appropriate amount of lubricating oil to the thrust portion, and as a result, it is possible to obtain extremely high reliability.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a thrust portion according to the embodiment.

FIG. 3 is a plan view of a thrust portion according to a second embodiment of the present invention.

FIG. 4A is a vertical sectional view showing a conventional scroll compressor, and FIG. 4B is a plan view of a thrust portion.

[Explanation of symbols]

1 ... Fixed scroll, 2 ... Orbiting scroll, 5 ... Rotating shaft, 6 ... Frame, 11 ... End plate, 12 ... Wrap, 2
1 ... End plate, 22 ... Wrap, 26, 27 ... Conducting groove, 52 ...
Oil supply hole, 61 ... chamber, 65 ... thrust portion, 66 ... oil supply groove,
67 ... Outflow groove, 68 ... Inflow groove.

Claims (2)

[Claims] 1. A fixed scroll and an orbiting scroll, in which spiral wraps are erected on the inner surface of each end plate, are meshed with each other, and the orbiting scroll is caused to revolve while orbiting while preventing its rotation. Lubricating oil is slidably supported on the formed thrust portion, and lubricated to the thrust portion through an oil supply hole formed in a rotary shaft for driving the orbiting scroll through a chamber formed in the center of the upper surface of the frame. In the guided scroll fluid machine, an oil supply groove is provided in the thrust portion at an intermediate position between the inner peripheral edge and the outer peripheral edge, and an outflow groove facing the outer peripheral edge from the oil supply groove is provided, and the outer surface of the end plate of the orbiting scroll is provided. And a conduction groove for periodically communicating the oil supply groove and the inner side of the inner peripheral edge of the thrust portion with the orbiting motion of the orbiting scroll. A scroll fluid machine characterized by the fact that 2. A fixed scroll and an orbiting scroll, in which spiral wraps are erected on the inner surface of each end plate, are meshed with each other, and the orbiting scroll is caused to revolve while orbiting while preventing its rotation. Lubricating oil is slidably supported on the formed thrust portion, and lubricated to the thrust portion through an oil supply hole formed in a rotary shaft for driving the orbiting scroll through a chamber formed in the center of the upper surface of the frame. In the guided scroll fluid machine, an oil supply groove is provided in the thrust portion at an intermediate position between the inner peripheral edge and the outer peripheral edge, and an inflow groove facing the inner peripheral edge from the oil supply groove is provided, and the outer surface of the end plate of the orbiting scroll is provided. And a conduction groove for periodically communicating the oil supply groove with the outside of the outer peripheral edge of the thrust portion in accordance with the orbiting motion of the orbiting scroll. A scroll fluid machine characterized by the fact that