JPS60166781A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent the breakage of mechanical parts by introducing high- pressure gas onto the back surface of a slider and installing a sealing mechanism onto the side wall of the slider, thus permitting the operation having the superior efficiency, and by momentarily shifting a swirl scroll in the axial direction. CONSTITUTION:The coolant which flows through a suction hole 10 in the normal operation state is compressed between the respective laps 4b and 5b of a fixed scroll 4 and a swirl scroll 5 and discharged into a sealed casing 1 from a discharge hole 9. When high-pressure gas is introduced into a gas pocket 21 through a gas introducing hole 22, slider 20 floats-up to support the swirl scroll 5. The lubricating oil contained in the discharged gas which flows into an oil feeding passage 16 lubricates the contact surface between the slider 20 and a mirror plate 5a through the oil feeding passage of the slider 20, and a portion of the lubricating oil reaches the side wall on the outside and inside diameter sides of the slinder 20, and thus the captioned apparatus operates as a sealing mechanism for preventing the gas leak between the gas pocket 21 and the back- pressure chamber 12.

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, and more particularly to a thrust support device for a scroll that performs an orbiting motion.

Dao d Sub-9 configuration and its problems In Figures 1 and 2, 11-j, sealed casing,
2 is an electric motor section, and on its upper part there is a block 3 and a fixed scroll 4. A mechanical part main body 7 composed of an orbiting scroll 6 and an anti-rotation mechanism 6 is fixed. The fixed scroll 4 is formed of an end plate 4a and an involute or a curve similar to an involute standing upright on the end plate 4a, and has a wrap 4bjjj) having a uniform thickness and height,
It is fixed to the block 3 by a mirror plate 4a. The orbiting scroll 6 is constructed of a wrap 6b that stands upright on an end plate 6a and an end plate 5d and has the same curve as the wrap 4b of the fixed scroll 4. was held on the stopper sb inside. It is disposed in contact with a slider 8 that is movable in the axial direction, and is restrained by an anti-rotation mechanism 6. The thickness of the slider 8 is set so that the rotating scroll 6 can move several microns to several islands in the axial direction.

The fixed scroll 4 and the orbiting scroll 6 each wrap 4b.
, 6b are combined with the winding end ends 4b' and sb' shifted by a certain angle.

9 is a discharge hole, and 10 is a suction hole. The discharge hole 9 is provided at the center of the involute of the fixed scroll 4, and the suction hole 1Q is provided at the outer edge of the end plate 4a of the involute of the fixed scroll 4. 6c is a protrusion provided on the opposite side of the wrap 6b of the orbiting scroll 6, and is concentric with the center of the involute of the ramp 6b. Reference numeral 11 denotes a shaft supported by the block 3, and the electric motor section 2 is installed by housing the protrusion 6c of the orbiting scroll i in a boss section 11a provided at the end of the main body 7 side of the machine section and eccentric from the center of the shaft.
and the orbiting scroll 6 are connected.

Reference numeral 12 denotes a back pressure chamber formed on the back surface of the orbiting scroll 6, which includes a suction chamber 13 formed at the outer edge of the orbiting scroll 6 on the ship 6b side and having a suction hole 1o, a communication hole 14a,
It communicates via 14bi.

Further, a hydraulic pocket 16 is provided on the back surface of the slider 8, and the hydraulic pocket 16 communicates with the upper surface of the fixed scroll 4 via an oil supply passage 16 provided on the side wall of the block 3 and the fixed scroll 4. . 17 is the suction pipe,
18 is a discharge pipe.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 11 accompanying the rotation of the electric motor section 2 is transmitted to the orbiting scroll via the boss section 11a and the protrusion section 6c, but due to the action of the rotation prevention mechanism 6, the orbiting scroll 6 does not rotate on its own axis and remains a fixed scroll. It rotates around the center of the involute No. 4 as the center of rotation. At this time, the end esb' of the wrap 6b of the orbiting scroll 6 is in contact with the wrap 4b of the fixed scroll 4, and the end 4b' of the wrap 4b of the fixed scroll 4 is in contact with the wrap 6b of the orbiting scroll 6. is the completion of suction, and as the orbiting scroll 6 revolves, the wrap 4b and the ramp 6b
As the two contact points approach the center of the involute, the pressure between the compression chambers S increases.

The compression mechanism of this scroll compressor allows the suction pipe 17 to be connected to the suction hole 10. The refrigerant sucked through the suction chamber 13 is compressed and once discharged into the sealed casing 1 through the discharge hole 9, and then completely discharged through the discharge pipe 18 to a cooling system (not shown). At this time, as the pressure in the compression chamber S increases, a thrust force is generated between the fixed scroll 4 and the orbiting scroll 6 that tends to separate them in the axial direction. If the fixed and orbiting scrolls 4 and 6 are completely separated by this thrust force, the seals on the axial end faces of the wraps 4b and 6b will be incomplete, increasing leakage and reducing efficiency. Among the refrigerant discharged into the sealed casing 1 through the refrigerant and the lubricating oil mixed therein, only the lubricating oil is separated and introduced into the hydraulic pocket 16 through the oil supply passage 16, and the slider 8 is By surfacing the
The rotating scroll 6 that is about to leave the fixed scroll 4
Due to the pressing force generated by the pressing force and the low pressure of the back pressure chamber 12, pressing force greater than the thrust force by the compressed gas was obtained.

However, most of the force in pressing is obtained from the hydraulic pressure of lubricating oil, which is an incompressible liquid. The thrust force of the scroll 6 also increases rapidly, and as a result it tries to push down the slider 8, but the hydraulic pocket 16
The lubricating oil inside cannot flow out instantly due to the resistance of the oil supply passage 16, and the inside of the hydraulic pocket 16 becomes high pressure and the slider 8
The force increases when pressed against. And the orbiting scroll 16
This will instantly restrict the axial movement of the Therefore, there were problems such as excessive force being applied to the orbiting scroll 6, fixed scroll 4, and shaft 11, resulting in damage.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional example, and enables efficient operation by appropriately pressing the orbiting scroll, whether during normal operation or during abnormal operation such as liquid compression. and to prevent damage to mechanical parts.

Structure of the Invention The present invention introduces high-pressure gas into the back of the slider and provides a sealing mechanism on the side wall of the slider. Under normal operating conditions, moderate pressing applies force to the orbiting scroll and prevents high-pressure gas from flowing into the back pressure chamber. This system prevents intrusion using a seal mechanism, allows efficient operation, and furthermore prevents damage to mechanical parts by instantly moving the orbiting scroll largely in the axial direction during liquid compression.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.

Note that the same parts as in the conventional example are given the same reference numerals and detailed explanations are omitted.

19 is a block with an annular groove 1 provided on its outer periphery.
A slider 2° movable in the axial direction is fitted into the inside of the slider 9a with a slight clearance, and the slider 20 is held on a stopper 19b in an annular groove 19a. There is also a gas pocket 2 on the back of the slider 2°.
1 is formed, and the gas pocket 21 communicates with the inside of the sealed casing 1 through a gas introduction hole 22. Furthermore, one end of the outer diameter side wall surface of the slider 20 communicates with the oil supply passage 16, and the other end branches into two directions: the inner diameter side wall surface of the slider 20 and the contact surface of the end plate 6a of the orbiting scroll 6. An oil supply path 23 is provided which opens through the hole.

In the above configuration, under normal operating conditions, the refrigerant flows in through the suction hole 10'iz as in the conventional case.

Wrap 4b of fixed scroll 4 and orbiting scroll 6.

6b and is discharged into the sealed casing 1 from the discharge hole 9. When this high-pressure gas is introduced into the gas pocket 21 through the gas introduction hole 22, the pressure of the high-pressure gas is applied to the back surface of the slider 2°.
o floats up and supports the orbiting scroll 6. Therefore,
The thrust force that acts on the orbiting scroll 6 due to normal operation compression becomes the pressure in the back pressure chamber 12 and the gas pocket 21, is partially supported by the low pressure in the back pressure chamber 12, and acts on the back surface of the slider 2Q. This is supported by the high pressure of the discharged gas. Furthermore, the lubricating oil contained in the discharged gas flowing into the oil supply passage 16 is removed from the oil supply passage 20 of the slider 20.
A sealing mechanism that lubricates the contact surface between the slider 2o and the end plate 6a through the sealing mechanism, and partially reaches the outer and inner side walls of the slider 20 to prevent gas leakage between the gas pocket 21 and the back pressure chamber 12. It acts as. Therefore, it is possible to suppress gas leakage to the same level as the conventional method of introducing lubricating oil to the back surface of the slider 20, and efficient operation can be performed.

Furthermore, during liquid compression operation, the pressure in the compression chamber becomes extremely high due to liquid compression, and a large thrust force is instantaneously applied to the slider 20 from the orbiting scroll 6. Because the gas is introduced, the slider 20 moves downward (from the axial direction F) at a speed that immediately follows the instantaneous fluctuations in the thrust force, and the wrap 6b of the orbiting scroll 6 separates from the end plate 4b of the fixed scroll 4. , the seal on the axial end face of the wrap 6b is broken, and the extremely high pressure refrigerant in the compression chamber S leaks to the low pressure side.

Therefore, even if the pressure in the compression chamber suddenly increases during liquid compression, it is possible to instantly release the abnormally high pressure refrigerant to the low pressure side, causing damage and wear to the orbiting scroll 6, fixed scroll 4, shaft 11, etc. This is because lubricating oil is introduced between the gas pocket 21 in a high pressure state and the back pressure chamber 12 in a low pressure state to provide sealing properties.

Efficient operation is possible with less leakage of high pressure gas into the back pressure chamber 12. Regarding the seal mechanism.

As shown in FIG. 5, it is possible to improve sealing performance by providing annular grooves 24a and 24b communicating with the oil supply groove 23 on the inner and outer sides of the slider 2o, and as shown in FIG. , sealing material 26a.

It goes without saying that by arranging 2sb on the inner and outer side surfaces of the slider 20, the sealing performance is further improved.

Effects of the Invention As is clear from the above explanation, the present invention comprises fixed and rotating scrolls in which interlocking lamps are made upright from the end plate, a block that fixes one of these two scrolls, and a block that fixes one of these two scrolls, and a rotation of the other rotating scroll. It is equipped with an anti-rotation mechanism that prevents the rotating motion from occurring and a slider that is placed between the end plate and the block of the orbiting scroll that performs the orbiting motion and has a sealing device on the side wall, and high-pressure gas is introduced into the back of the slider. Even if the pressure in the compression chamber rises rapidly during liquid compression, by instantly moving the orbiting scroll in the axial direction, it is possible to release the abnormally high pressure refrigerant to the low pressure side, thereby preventing mechanical parts. In addition, since a sealing mechanism is provided between the gas pocket in a high pressure state and the back pressure chamber in a low pressure state, it is possible to operate efficiently with less leakage of high pressure gas.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a conventional scroll compressor, and FIG. 2 is a sectional view taken along line n-n' in FIG. FIG. 3 is a vertical sectional view of a scroll compressor showing one embodiment of the present invention, FIG. 4 is an enlarged sectional view of the slider portion of the compressor, and FIGS. FIG. 3 is an enlarged sectional view of the slider portion shown in FIG. 4... Fixed scroll, 4a, 5a... End plate, 4b, 5b... Wrap, 6...
Orbiting scroll, 6... Rotation prevention mechanism, 19...
...Block, 20...Slider, 23...
...Seal mechanism (oil supply path). Figure 1 Figure 2 Figure 31! ! U 4 Figure Figure 6

Claims (1)

[Claims] A fixed scroll and an orbiting scroll having interlocking lamps standing upright from an end plate, a block for fixing one of the scrolls, an anti-rotation mechanism for preventing the other orbiting scroll from rotating and performing an orbiting motion, and the end plate of the orbiting scroll. and the block, the scroll compressor comprising a slider having a sealing mechanism on a sliding side wall, and introducing high pressure gas into the back surface of the slider.