JPS6193287A - Scroll-type compressor - Google Patents

Abstract

PURPOSE:To improve sealing capacity in a scroll-type compressor by forming an oil separation chamber behind a fixed scroll component and supplying the oil separated thereto the end plate part of a rotating scroll intermittently. CONSTITUTION:On the back side of a fixed scroll component 7, there is an oil separation chamber, which is linked to a discharge pipe 18, and the oil separated there is stored at an oil sump 16 formed around the fixed scroll component. To the oil sump 16, ends of oil supply routes 22a, b whose other ends are communicated to the end plate p[art of an oscillating scroll component 21, are communicated. On the end plate part of the oscillating scroll component which the oil supply routes face, a storage groove 23 is formed, and within this groove a keep plate 24 is contained. Accordingly, the opening part of the oil supply routes is closed and opened intermittently owing to the transfer of the keep plate, and a proper volume of oil can be supplied to the end plate part of the oscillating scroll component.

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 particularly relates to a system for supplying an appropriate amount of lubricating oil to the wrap.

'f! 1 Conventional configuration and its problems In Figures 3 and 4, 1 is a sealed casing, 2 is an electric motor section, and a block 3゜fixing block 9-
4. Orbital scroll 5. A mechanical arm main body 7 constituted by an anti-rotation mechanism 6 is fixed. The fixed scroll 4 is composed of an end plate 4a and a wrap 4b formed of an involute or a curve similar to an involute standing upright on the end plate 4a and having a uniform thickness and height, and is fixed to the block 3 by the end plate 4a. Also, the orbiting scroll 5 stands upright on the end plate 5a and has the same curve as the wrap 4b of the fixed scroll 4. Consisting of 5b,
The end plate 5a fits into the annular groove 3a of the block 3,
It is disposed in contact with an axially movable slider 8 held on a stopper 3b in an annular groove 3a, and is restrained by an anti-rotation mechanism 6. In addition, the slider 8 is installed so that the orbiting scroll 5 can move in the axial direction for several microseconds to several seconds.
The thickness is set.

The fixed scroll 4 and the orbiting scroll 5 each wrap 4b.
, 6b are combined with the winding ends 4b' and tsb' shifted by a certain angle.

9 is a discharge hole, 10 is a suction hole, the discharge hole 9 is located in the center of the volute of the fixed scroll 4, and the suction hole 10 is
is provided at the outer edge of the involute end plate 4a of the fixed scroll 4. 5C is a protrusion provided on the opposite side of the ramp 5b of the orbiting scroll 5, and is concentric with the center of the involute of the wrap 5b. 11 is block 3
The electric motor part 2 and the orbiting scroll 5 are connected by housing the protrusion 5C of the orbiting scroll 5 in a boss part 11a provided at the end of the main body T side of the machine part and eccentric from the center of the shaft 7. ing.

Also, an oil reservoir 11b is opened in the center. Reference numeral 12 denotes a back pressure chamber formed on the back surface of the orbiting scroll 5, which is connected to a suction chamber 13 formed at the outer edge of the orbiting scroll 5 on the side of the lamp 6b and in which the suction hole 10 is opened, and through communication holes 14a and 14b. It's communicating.

Further, a hydraulic pocket 15 is provided on the back surface of the slider 8, and the hydraulic pocket 15 communicates with the upper surface of the fixed scroll 4 via an oil reservoir 16 provided on the block 3 and the side wall of the fixed scroll 4. . 17 is the suction pipe, 1
Reference numeral 8 indicates a discharge pipe, and reference numeral 19 indicates lubricating oil sealed within the closed cane puffer 1.

Next, the compression mechanism of the scroll compressor will be explained. The rotational movement of the shaft 110 accompanying the rotation of the electric motor section 20 is transmitted to the orbiting scroll 5 via the boss section 11a and the projection section 5C, but due to the action of the rotation prevention mechanism 6, the orbiting scroll 6 does not rotate on its own axis and the fixed scroll 4 rotates. Rotates around the center of the involute. At this time, the end 6b' of the wrap 5b of the orbiting scroll 6 is in contact with the wrap 4b of the fixed scroll 4, and the end 4b' of the end 9 of the wrap 4b of the fixed scroll 4 is in contact with the wrap 5b of the orbiting scroll 5. The state is that suction is complete, and as the two contact points of the wraps 4b and 6b approach the center of the involute as the orbiting scroll 5 revolves, 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 discharged into the -H sealed casing 1 through the discharge hole 9, and then 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 5 to try to separate them in the axial direction. Of the lubricating oil mixed therein, only the lubricating oil is separated and introduced into the hydraulic pocket 16 via the oil reservoir 16, and the slider 8 is levitated by hydraulic pressure, so that the orbiting scroll tries to separate. 6 against the fixed scroll 4 and the force generated by the low pressure in the back pressure chamber 12,
The pressing force is greater than the thrust force generated by compressed gas.

In this conventional configuration, the lubricating oil 19 in the lower part of the sealed casing 1 has a high pressure inside the sealed casing 1 and a low pressure in the back pressure chamber 12, so that the shaft 1
1 reaches the boss portion 11a through the oil filler 11b inside the boss portion 1.
1a and the protrusion 5C, and flows into the back pressure chamber 12. Then, the communication holes 14a, 14 of the orbiting scroll are then opened.
B gradually flows into the suction chamber 13 through the suction gas, is compressed together with the suction gas in the compression chamber S, and then flows into the discharge hole 9 together with the compressed gas.
It is discharged into the sealed casing 1 and returned to the lower part of the sealed casing 1. At this time, if the hole diameters of the communication holes 14a and 14b are too large, there is a problem that the effect of heat reception of the suction gas in the back pressure chamber 12 becomes large and the volumetric efficiency decreases. The pressure of the orbiting scroll 5 increases.
Since there is a problem that the force of pressing the hole against the fixed scroll 4 is excessive and the mechanical loss becomes large, the most efficient hole diameter is selected and is usually about 1 hour for the 3H) class. Therefore, since the amount of lubricating oil 19 flowing into the suction chamber 13 from the back pressure chamber 12 is very small, the sealing between the wraps sb and 4b of the orbiting scroll 5 and fixed scroll 4 by the lubricating oil is incomplete, and the compressed gas There was a problem of a large drop in volumetric efficiency due to leakage.

Purpose of the Invention The present invention solves the drawbacks of the conventional example described above.In order to seal between the lamps, in addition to the lubricating oil flowing from the back pressure chamber to the low pressure chamber, it is included in the device gas consisting of the discharge hole. The purpose is to separate and introduce lubricating oil and to improve volumetric efficiency by preventing as much as possible the inflow of high pressure gas during the introduction.

Structure of the Invention The present invention provides an oil reservoir on the side opposite to the lamp of a fixed scroll for separating and storing lubricating oil contained in the discharged gas, and an oil reservoir provided on the end plate of the fixed scroll, one end communicating with the oil reservoir and the other end. The oil supply hole opened in the end plate of the orbiting scroll is intermittently opened and closed by a holding plate housed in the end plate of the orbiting scroll, supplying the appropriate amount of lubricating oil to the lamp part for efficient operation. It was made in a similar manner.

DESCRIPTION OF EMBODIMENTS 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.

20 is a fixed scroll, which includes an end plate 20a and an end plate 20a.
It has a wrap 20b of the same shape as the conventional one that stands upright, and an oil reservoir 16 is formed on the outer periphery of the fixed scroll 20 as in the conventional one. Reference numeral 21 denotes an orbiting scroll, which has an end plate 21a and a lamp 21b as in the conventional case. 22a, 2
2b is a hole formed in the end plate 20a of the fixed scroll 20, and has one end connected to the oil reservoir portion 16. This is an oil supply hole whose other end faces a presser plate 24 part fitted into a storage groove 23 provided in a wrap-side end plate 21a of the orbiting scroll 21. or,
The oil supply holes 22a and 22b are intermittently opened and closed by a presser plate 24 that moves in the same manner as the orbiting scroll 21.

In the above configuration, the suction gas is compressed and discharged from the discharge hole 9 into the sealed casing 1 as in the conventional case, but the lubricating oil contained in the discharge gas is separated and sent from the oil reservoir 16 into the oil supply holes 22a and 22b. flows into. On the other hand, since the presser plate 24 moves in the same manner as the orbit of the orbiting scroll 21, the oil supply hole 22a is closed.

22b is intermittently opened and closed, so that lubricating oil separated from the discharged gas is intermittently supplied.

Therefore, in addition to the lubricating oil that flows from the conventional back pressure chamber 12 into the compression chamber S from the suction chamber 13, the lubricating oil separated from the discharge gas also flows into the holding plate 24 and the positions and hole diameters of the oil supply holes 22a and 22b. By adjusting the above, an appropriate amount can be supplied, and the volumetric efficiency can be improved by improving the sealing performance. Furthermore, since the lubricating oil flows intermittently due to the holding plate 24, even if the oil supply holes 22a and 22b are designed to be relatively large, a large amount of lubricating oil and high-pressure gas will flow into the suction chamber 13, reducing volumetric efficiency. Since the oil supply holes 22a and 22b can be easily machined, the machining accuracy can also be lowered.

Effects of the Invention As is clear from the above explanation, the present invention comprises a fixed scroll and an orbiting scroll in which mutually interlocking wraps are made upright from the end plate, and the wraps are disposed on the end plate of the fixed scroll and one end is formed on the side opposite to the ramp of the fixed scroll. An oil supply hole which is opened in the oil reservoir part and whose other end is opened at a position facing the end plate part of the orbiting scroll, a storage groove provided in the end plate on the lap side of the orbiting scroll, and a presser foot stored in the storage groove. The presser plate intermittently opens the oil supply hole, and the seal between the laps can be achieved with both the lubricating oil separated from the discharged gas and the lubricating oil flowing in from the back pressure chamber. In addition to improving the volumetric efficiency due to improved performance, the amount of lubricating oil supplied can be easily controlled by changing the positional relationship between the holding plate and the oil supply hole, the hole diameter, etc.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a scroll compressor of the present invention;
Figure 2 is a sectional view taken along line II-U' in Figure 1, Figure 3 is a longitudinal sectional view of a conventional scroll compressor, and Figure 4 is a sectional view taken along line IV-IV' in Figure 3. be. 16... Oil reservoir section, 20... Fixed scroll, 21... Orbiting scroll, 20a, 2
1'a... End plate, 2ob, 21 b-, -,
Wrap, 22a, 22b... Oil supply hole, 23.
... Storage groove, 24 ... Holding plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure, Figure 2 Figure 3

Claims (1)

[Claims] A fixed scroll and an orbiting scroll having wraps that engage with each other are made upright from an end plate, and a hole provided in the end plate of the fixed scroll, one end of which is opened in an oil reservoir formed on the side opposite to the wrap of the fixed scroll, and the other end of which is the orbiting scroll. an oil supply hole opened at a position facing the end plate portion of the orbiting scroll, a storage groove provided in the end plate on the lap side of the orbiting scroll, and a presser plate housed in the storage groove, and the presser plate is provided with the oil supply hole. A scroll compressor with holes that are opened intermittently.