JPS62182484A - Scroll compressor - Google Patents

Abstract

PURPOSE:To make the oil quantity flowing into a compression chamber adequate and improve the lubricity of an eccentric bush by providing an oil passage on the outer periphery of the eccentric bush inserted into the eccentric hole of a shaft and blocking the rotary scroll side end section of the oil passage. CONSTITUTION:An oil passage 23 extending in the shaft direction is formed on the outer periphery of an eccentric bush 13 which has an eccentric hole 14 inserted with the shaft 5a of a rotary scroll 5 and is inserted into an eccentric hole 12 formed at the upper end of a shaft 9, and the rotary scroll side end section is blocked. The oil fed through an oil passage 15 in the shaft 9 is thoroughly fed to the outer periphery of the eccentric bush 13 via the oil passage 23 and reliably lubricates the eccentric bush 13, but one end of the oil passage 23 is blocked, thus no excessive oil flows into a compression chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor used in a refrigeration cycle or the like.

2. Description of the Related Art An example of a conventional scroll compressor will be described with reference to FIGS. 3 to 6 with reference to the drawings.

In the figure, 1 is a sealed casing, 2 is a motor section, and a compressor section 3 is disposed above the motor section. The compressor section 3 has a fixed scroll 4. Orbiting scroll 6, rotation prevention mechanism 6. It is composed of a block 7, and the block 7 is fixed to the closed casing 1. Also 8 is block 7
This is a frame that connects the motor unit 2 and the electric motor unit 2.

A shaft 9 is supported by a sliding bearing 1o provided on the block 7 and a sliding bearing 11 provided on the frame 8. An eccentric hole 12 is provided on the upper end surface of the shaft 9 at a position eccentric to the rotational axis, and an eccentric pusher 13 is rotatably fitted into the eccentric hole 12. An eccentric hole 14 is bored in the eccentric push 13 so as to be eccentric from the center axis of the eccentric push 13. The shaft 6a of the orbiting scroll 5 is rotatably fitted into the eccentric hole 14, and the orbit scroll 5 is rotated. The rotation of the shaft 9 and the action of the anti-rotation mechanism 6 cause the rotation movement.

Reference numeral 15 denotes an oil supply path provided eccentrically within the shaft 9, and its end portion communicates with the slide bearing 10 and the eccentric hole 12.

Reference numeral 16 designates a thrust ball bearing for supporting the force that is applied to the orbiting scroll 5 in the direction of moving away from the fixed scroll 4 due to the compression action.

Further, 17 is a balance weight, 18 is a suction pipe, 19 is a discharge pipe, and 20 is a discharge hole.

The operation of the scroll compressor configured as described above will be explained below.

When the shaft 9 starts rotating, the refrigerant flowing from the suction pipe 18 is compressed by the compressor section 3, and once discharged from the discharge hole 2o into the sealed casing 1, it is passed through the discharge pipe 19 to the cooling system (Fig. (not shown).

At this time, the pressure in the back pressure chamber 21 on the back side of the orbiting scroll 5 is approximately the suction pressure because the back pressure chamber 21 communicates with the suction pipe 18, and the pressure in the sealed casing 1 is approximately the discharge pressure. As a result, the oil accumulated at the bottom of the closed casing 1 flows into the oil supply path 16 in the shaft 9 due to the differential pressure and the effect of the centrifugal pump, supplying oil to the plain bearings 10.11.

Further, when the shaft 9 rotates and a compression action occurs, a resultant force F of the gas compression action force F1 and the centrifugal force F2 acts on the orbiting scroll 6. Then, as shown in FIG. increase As a result, the spirals of the orbiting scroll 6 come into contact with the spirals of the fixed scroll, and the compression chamber 22 is sealed in the radial direction, thereby improving the volumetric efficiency and preventing an increase in power due to recompression of the gas.

Problems to be Solved by the Invention However, in the above configuration, it is necessary to increase the turning radius r0 to reliably operate the so-called variable turning radius mechanism, which is a mechanism for radially sealing the compression chamber, or to improve volumetric efficiency. , leading to prevention of power increase. In other words, it is necessary that the eccentric push 13 rotate reliably within the eccentric hole 12.

However, with this configuration, the amount of oil that has gone up to the lower end surface of the eccentric push 13 through the oil supply path 16 in the shaft 9 flows into the sliding portion between the outer peripheral surface of the eccentric push 13 and the inner surface of the eccentric hole 12 is limited. , is determined by the clearance between the outer diameter of the eccentric pusher 13 and the inner diameter of the eccentric hole. If this clearance is large, oil is excessively supplied to this sliding part, and the supplied oil flows into the compression chamber 22 through the back pressure chamber 21, resulting in a decrease in volumetric efficiency and an increase in power due to oil compression. Furthermore, if this clearance is small, excessive oil will not flow into the compression chamber 22, but there will be a problem in that the sliding parts will be insufficiently lubricated, and the variable turning radius mechanism will malfunction.

The present invention was developed in view of the above points, and it not only makes the amount of oil flowing into the compression chamber appropriate, but also improves the lubricity against the rotation of the eccentric pusher, ensures the operation of the variable turning radius mechanism, and improves the volumetric efficiency. To provide a scroll compressor that is high in price and requires little increase in power.

Means for Solving the Problems In order to solve the above problems, the scroll compressor of the present invention has an oil passage provided on the outer circumferential surface of the eccentric pusher, and an end of the oil passage on the orbiting scroll side is closed. This is what I did.

Effect The present invention, with the above configuration, optimizes the clearance between the eccentric pusher and the eccentric hole, and by optimizing the amount of oil supplied to this clearance part, the amount of oil flowing into the compression chamber is optimized, and the turning radius is variable. The purpose is to ensure the operation of the mechanism, improve volumetric efficiency, and reduce the increase in power.

EMBODIMENT A scroll compressor according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that the same parts as in the conventional example are given the same reference numerals and detailed explanations are omitted.

An eccentric pusher 13 is fitted into an eccentric hole 12 provided on the upper end surface of the shaft 9 eccentrically with respect to the rotation axis with a clearance δ sufficient to prevent excessive oil from flowing into the back pressure chamber 21. As shown in FIG. 2, an oil passage 2 is formed on the outer peripheral surface of the eccentric pusher 13 with a notch parallel to the axial direction.
3 is provided so as to close the end on the orbiting scroll side.

Next, we will discuss the operation. When the shaft 9 rotates and performs compression, a radial acting force F1, an axial acting force F3, and a centrifugal force F2 are applied to the orbiting scroll 6 due to the compression.
The axial acting force F3 is supported by the thrust ball bearing 16, and the resultant force F of the radial acting force F1 and the centrifugal force F2 is supported by the shaft 6.
It acts on the center 01 of a.

Then, since the center o1 is eccentric with respect to the center 02 of the eccentric push 13, a moment that tries to rotate acts on the eccentric push 13, and the eccentric push 13 is eccentric to the center o2.
2, the turning radius r0 increases. As a result, the spiral of the orbiting scroll 6 comes into contact with the spiral of the fixed scroll 4, and the compression chamber 22 is sealed in the radial direction. 23, sufficient oil is supplied to the entire outer peripheral surface of the eccentric push 13, the sliding friction force between the eccentric push 13 and the eccentric hole 12 is reduced, and the operation of the variable turning radius mechanism is more reliable. become.

Furthermore, since the end of the oil passage 23 on the orbiting scroll side is closed and does not communicate with the back pressure chamber 21, the oil that attempts to flow from the oil passage 23 into the back pressure chamber 21 is throttled by the clearance δ, and the excess oil is This prevents excess oil from flowing into the compression chamber 22, thereby preventing a decrease in volumetric efficiency and an increase in power.

Although the oil passage 23 in this embodiment has a notch parallel to the axial direction, it goes without saying that the effect will not change if the oil passage 23 is formed into a spiral groove or the like.

Effects of the Invention As described above, in the present invention, an oil passage whose end on the orbiting scroll side is closed is provided on the outer circumferential surface of the eccentric pusher to reduce the frictional force resisting the rotation of the eccentric pusher, thereby reducing the orbiting radius. The operation of the variable mechanism is ensured, and since the amount of oil flowing into the back pressure chamber is restricted, a decrease in volumetric efficiency and an increase in power during compression can be prevented, and a highly efficient scroll compressor can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a scroll compressor showing an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the main part of FIG. 1, FIG. 3 is a vertical sectional view of a conventional scroll compressor, and FIG.
The figure is a sectional view of the main part of FIG. 3, and FIG. 6 is an enlarged sectional view of the main part of FIG. 4...Fixed scroll, 6...Orbiting scroll, 6...Rotation prevention mechanism, 7...
・Block, 9...Shaft, 12...
・Eccentric hole, 13...Eccentric push, 23...
...Oil passage. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 5

Claims (1)

[Claims] a fixed scroll and an orbiting scroll having a plurality of spirals; a block for fixing the fixed scroll; an anti-rotation mechanism for rotating the orbiting scroll without rotating the orbiting scroll relative to the fixed scroll; An eccentric hole is provided in an end surface on the side of the orbiting scroll at a position eccentric to the rotation axis, a shaft having an eccentric push rotatably fitted in the eccentric hole, and an oil passage is provided on the outer peripheral surface of the eccentric push, A scroll compressor, wherein an end of the oil passage on the orbiting scroll side is closed.