JPS58124083A - Lubricating oil feeding mechanism for scroll compressor - Google Patents

Abstract

PURPOSE:To enable to close an oil supply passage when operation of a compressor is stopped, by providing a valve that is opened and closed in response to the pressure difference between compression chambers, in the oil supply passage extended between an oil sump in a discharge chamber and an end face of a fixed scroll. CONSTITUTION:When operaion of a compressor is stopped, pressure in a compression chamber 25 is lowered, and pressure at a compression chamber section 25b and that at a compression chamber section 25c become equal to each other. At the same time, pressure in a first pressure chamber 21 and that in a second pressure chamber 22 also become equal to each other. Resultantly, a spool 20 that has been urged toward the second pressure chamber 22 against the force of a spring 26, is slided toward the first pressure chamber 21 by the force of the spring 26. That is, communication between two oil suppy passages 19a, 19b is broken by the spool 20, so that supply of lubricating oil to an oil supply groove 9 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a lubricating oil supply mechanism in a scroll compressor, and more specifically, the lubricating oil stored in an oil reservoir in a discharge chamber is swirled between a fixed scroll and a rotating scroll. This invention relates to an improvement in a mechanism for supplying water to the sliding surfaces of a fixed scroll and a rotating scroll through a pressure difference generated between a compression chamber formed in a shape of a shape, and a discharge chamber. Its purpose is to prevent lubricating oil from overflowing into the compression chamber.

In a scroll compressor, a method of supplying lubricating oil to the sliding surfaces of the rotating scroll and fixed scroll is to provide a lubricating oil supply groove on the tip edge of the scroll piece, and to connect the supply groove and the oil pool in the discharge chamber. The oil is stored in the oil reservoir using the pressure created in a spiral shape between both scrolls when the compressor is operating, and the pressure difference created between the discharge chambers. Attempts have been made to pump lubricating oil into the supply groove. (Unexamined Japanese Patent Publication No. 56-56
．． However, in the above method, when the operation of the compressor is stopped, the pressure inside the compression chamber formed between both scrolls leaks out of the compression chamber at the same time as the operation is stopped, and the pressure suddenly increases. While the pressure in the compression chambers is the same, the discharge chamber is formed in a sealed state, so that the pressure state at the time of shutdown is maintained as it is even after shutdown. That is, a pressure difference occurs between the discharge chamber and the compression chamber. This pressure difference allows lubricating oil to be supplied to the supply groove even after the operation has stopped.
The lubricating oil overflows from the supply groove and accumulates in the compression chamber. As a result, the lubricating oil accumulates in the compression chamber, causing problems such as liquid compression when the compressor is restarted.

The present invention has been improved in view of the above-mentioned circumstances, and includes an on-off valve for the oil supply path connecting the oil reservoir in the discharge chamber and the supply groove carved in the tip edge of the scroll. The feature is that the supply of lubricating oil can be stopped in conjunction with the stoppage of the compressor by automatically opening and closing the on-off valve based on changes in the pressure generated within the compressor. It is something.

That is, the gist of the present invention is that an on-off valve for shutting off the oil supply passage is provided in the oil supply passage connecting between the oil reservoir in the discharge chamber and the end face of the fixed scroll, and the on-off valve is formed in a spiral shape between both scrolls. The structure is such that it can be opened and closed by changing the pressure difference that occurs between each compression chamber or by changing the pressure that occurs between the compression chamber and the discharge chamber.

Specific embodiments of the present invention will be described below with reference to illustrative drawings.

FIGS. 1 to 4 are drawings showing a first embodiment, in which (1) shows a housing that constitutes the outer shell of the compressor.

The housing (1) consists of a front nose housing (2) and a rear housing (3).
Uzing (2) has a front wall part (2a) and a front wall part (2a).
Surround the outer periphery of .

The surrounding peripheral wall portion (2b) exists and is formed into a growing cylindrical shape. And Llano Uzing (3) also has a rear wall (3a)
), and a peripheral wall (3) surrounding the outer periphery of the rear wall (3a).
b) is formed into a bottomed Japanese letter. That is, the housing (11 is both formed in a cylindrical shape with a bottom) and the housing (2)
It is constructed by joining the openings (3) together by screwing bolts (not shown). The interior of the front housing (2) is divided into two parts via a partition plate (4) fitted approximately in the middle of the front housing (2). That is, a suction chamber (5) is provided on the front wall (2a) side, and a compression chamber (6) is provided on the opening side. The suction chamber (5) and the compression chamber (6) are provided to communicate with each other through a through hole (4)' opened in the partition panel (4), and the compression chamber (6) is provided with a fixed scroll ( The fixed scroll (7) has a base (7a) fitted to the inner wall surface of the front housing (2) along the opening edge of the front housing (2), and a rotary scroll (8) to be described later. It consists of a scroll piece (7b) spirally protruding toward the front wall (2a) of the housing (2), and a lubricating oil supply groove (9) is provided at the tip edge of the scroll piece (7b). The scroll piece (7b) is carved in a spiral shape along the longitudinal direction.The suction chamber (5) has a suction port connected to the suction pipe (not shown) in the peripheral wall (2b), and Wall (
In 2a), the bearing is provided with a portion 0υ. A drive shaft U) is rotatably supported in the bearing portion 0υ. The drive shaft (121) has one end protruding outside the front housing (2) connected to an electromagnetic clutch (not shown), while the other end protruding into the front housing (2) has a crankshaft (
12)' is provided so as to face the compression chamber (6), and the above-mentioned rotating scroll (8) is pivotally mounted on the crankshaft H' so as to be able to swing and rotate.

The rotating scroll (8) has a base (8a) and a base (8a).
), the scroll piece (8b) spirally protrudes from the fixed scroll (7) in the direction of the fixed scroll (7), and the scroll piece (8b) is a scroll piece (
7b) with a different winding direction.

Furthermore, the scroll piece (8b) is provided so as to be able to come into sliding contact with the fixed scroll (blade side base (7a)),
A scroll piece (7b) on the fixed scroll (7) side is provided so as to be able to slide against the base (8a), and a spiral compression chamber (7b) is provided between both scroll pieces (7b) (8b). 25
1 is formed.

゛-As shown in the above, the opening of the front housing (2) (
The base (7a) of the fixed scroll (7) is fitted on the rear housing (3) side.
A discharge chamber 0 is formed between a) and the rear wall portion (3a). The discharge chamber (13)+I is provided with a discharge port <147 connected to a discharge pipe line (not shown) in the peripheral wall portion (3b). A discharge hole 09 is opened in the base (7a) corresponding to the center of the spiral formed in the scroll piece (7b), and a discharge valve (11') is opened and closed freely. (16) indicates a glue retainer for regulating the opening angle of the discharge valve (15)'.

The discharge chamber 03) also has an on-off valve mechanism Q according to the present invention.
71 is provided. The opening/closing valve mechanism θη includes a pulp body 0& formed in a long cylindrical shape and a commercial oil oil supply cylinder fil extending downward in a direction perpendicular to the longitudinal center of the pulp body O8. It is formed in a T-shape.

However, when the pulp body θ is solidified on the base (7a) of the fixed scroll (7), the pulp body (18) has an appropriate angle with respect to the spiral direction of the scroll piece (7b). They are arranged diagonally. In addition, a spool handle is slidably inserted into the pulp main body θ barrel, and pressure chambers (21) (hereinafter referred to as “first pressure chamber Qυ,
A second pressure chamber (2)j) is provided. 1st pressure chamber (21) and 2nd pressure chamber (Boat (c)' for 2nd function)
(2)' is provided, and a compression chamber (
6) A communication path (23 (24)) is extended in the direction.

The ends of both communicating passages (23) (24) are connected to compression chambers (2) formed on both sides with a scroll piece (7b) between them.
5b) and (25c) respectively.

The second pressure chamber (two are equipped with springs (c), and when the operation is stopped, the spool (4) is moved toward the first pressure chamber <21) via the spring (c) as shown in Figure 3. VC is provided so that it is in a biased state VC. Also, on the fourth side of the second pressure chamber, the spool head is attached to the boat (
23+' to prevent the same port (c)' from being blocked.
A boss (27) for stopping the spool (2) is protrudingly provided in correspondence with the opening position of the spool (2). The same boss is a boat (c)′
It is provided so as to be freely adjustable so as to obtain a length dimension that is the same as the diameter dimension of.

The oil supply tube a9 is provided with a lubricant oil supply path (19a). The oil supply passage (19a) has one end facing the oil reservoir QS' provided at the F end facing the discharge chamber, and the other end facing the inside of the pulp body. Then, from the pulp body o8, the fixed scroll i7)
A fuel supply path (19b) is extended. The same fueling route (19b
) is connected to the oil supply path (19) at one end on the pulp body tm side.
The spool (a) and the spool (a) are provided in an intermediate portion so as to be able to communicate with each other via the small diameter end. The other end of the oil supply passage (19b) is provided so as to face the tip edge of the scroll piece (8b), and is connected to a supply groove (9) carved in the same part of the tip edge of the scroll piece (8b). It is set up so that it communicates with you.

5 and 86 are drawings showing the second embodiment, in which t17) shows an on-off valve mechanism fixed to the force base (7a). The on-off valve mechanism θ'7) is long. A vertically elongated pulp body Qllll formed in a cylindrical shape and an oil supply cylinder (13
Consisted of. There is a narrowed part □□□ in the middle part of the valve body Ql, and a pressure chamber cn30 is located above and below the narrowed part □□□.
1 (hereinafter referred to as "first pressure chamber 翰, second pressure chamber (to)")
is provided. There is a first pressure chamber CI in the narrowing part (c)! 9I
11 is provided with a valve seat (C)'; A ball valve 01) is placed on the valve seat (c)', and a spool C33 is fitted into the second pressure chamber (to) so as to be able to move forward and backward. Same spool 0
2 is integrally provided with a small diameter part C321' in its upper half, and the small diameter part (34' is slidably inserted into the inside of 2), and the tip thereof is fitted with a ball valve (31). is provided so that it can be lifted from the valve seat (28').The second pressure chamber (25a) is connected to the compression chamber (25a) formed in the center of the fixed scroll (7) through a communication hole (7). ) is provided so as to be able to communicate with the compression chamber (25a).
The opening is provided as close to the discharge hole (15) as possible.

On the other hand, the oil supply cylinder (19) is provided with an oil supply passage (19a).The oil supply passage (19a) has one opening thereof connected to the discharge chamber (
13) is provided so as to face the oil reservoir 031' formed at the lower end, while the other opening is provided so as to face the first pressure chamber (c). Further, an oil supply channel 9b) is extended from the narrowed portion (c). The tip end of the oil supply passage (19b) is provided so as to face the tip edge of the scroll piece (7b), and the oil supply passage (19b) is provided so as to communicate with the supply groove (9) carved in the same part at the tip edge. In the figure and FIG. 5, (b) indicates a balance weight. In both of the above embodiments, the supply 111 is provided at the tip edge of the scroll piece (7b).
1 (91) is provided, and an oil supply path (19) is provided for the same supply groove (9).
Although one end of b) is made to communicate with the other end, the oil supply path (19
It is also possible to open one end of b) directly into the fixed scroll (force base (7a)).

Next, its effect will be explained.

In the first embodiment shown in FIGS. 1 to 4, FIG. 3 is a diagram showing the operating state of the on-off valve mechanism Uη when the compressor is stopped. Since there is no pressure difference in the compression chambers (25a) (25b) (25c) formed between both scroll pieces (7b) (8b), the spool (to) has a spring (
26) in the direction of the first pressure chamber Qυ, that is, the oil supply path (19a) (19b
) is in a state where it is cut off.

However, when the operation is stopped as described above, by connecting and operating an electromagnetic clutch (not shown) provided at one end of the drive shaft (1), the driving force of the engine is transmitted to the drive shaft (a). A state is obtained in which the rotating scroll (8) mounted on the drive shaft 00' crankshaft portion H' oscillates (revolutions) while its rotation is restricted. That is, the rotating scroll (8) The scroll piece (8b) on the fixed scroll (7) side has its outer circumference fixed on the scroll piece (7b)
More specifically, the scroll piece (7b) is in a state in which it oscillates and rotates toward the center of the spiral (in the direction of arrow a in FIG. 2) while discharging the liquid against the inner circumferential surface of the scroll piece (7b). can get. As described above, the scroll piece (8b) of the rotating scroll (8) swings and rotates while slidingly contacting the scroll piece (7b) of the fixed scroll (7).
A plurality of sealed portions, ie, compression chambers, are formed between both scroll pieces (7b) and (8b). In the compression chamber, the scroll piece (8b) of the rotating scroll (8) is directed toward the center (arrow a).
The compressed space (25
c) (25b) (25a) 0 is pumped toward the center, and as it is pumped toward the center □1, the volume of the container gradually increases.
・O that is reduced and a compression action of the refrigerant gas is obtained. In other words, by continuously repeating the above compression action, the vortex O is created in the compression space (25aH25b) (25c).
A state is obtained in which the compression tE force gradually increases from the outside toward the center. And both scrolls (71 (
The refrigerant gas pressure-fed to the center position of the refrigerant gas 81 pushes open the discharge valve α1' through its sagittal pressure, and is sent into the discharge chamber (I3). The refrigerant gas drawn into the refrigerant gas is separated from the lubricating oil mixed in the refrigerant gas and sent into the discharge pipe from the discharge port, while the lubricating oil separated from the refrigerant gas is The oil is stored in an oil reservoir Q3' formed at the lower end of the discharge chamber 03).

Compression chamber (c) through the rotating action of the rotating scroll (8)
As the pressure in each compression chamber (25a) increases,
As mentioned above, a pressure difference occurs between (25b) and (25c).
It, communication path c! , * (24) (7) are provided so as to be able to communicate with the first pressure chamber Qυ and the second pressure chamber @, respectively, so that the compression chamber (25b) is also connected between both positive dynamics rl+ +23 (25c) A pressure difference equal to the amount of pressure generated between
A higher pressure state is obtained in the second pressure chamber Q than in the second pressure chamber Q. As a result, a higher pressure state is obtained in the first pressure chamber 3υ than in the second pressure chamber (A), resulting in a school (A).
The 0 spool head, which retreats toward the second pressure chamber against the biasing pressure of the spring (c), retreats toward the four directions of the second pressure chamber, as shown in Fig. 4. Both fuel supply routes (19
a) A state is obtained in which (19b) communicates through the small diameter end' of school (a).

On the other hand, by sending the compressed refrigerant gas into the discharge chamber (1), the discharge chamber (1) is the compression chamber (25b) (2
A higher pressure state is obtained than in part 5C). In other words, a pressure difference is created between the discharge chamber (13) and the compression chambers (25b) (25c). As a result, the lubricating oil stored in the oil reservoir (13)' is fed through the supply 119 (91V) carved into the tip edge of the scroll piece (7b) through the oil supply path (19a) (19b) through the pressure difference. When the operation is stopped from the operating state described in 〇-1, the pressure in the compression chambers (25aN25bH25c) decreases and the pressure difference between the compression chambers (25aN25bH25c) disappears, and both normal compression chambers (25b) (2
5c ) The two compression chambers (25b) return to the same pressure state.
(g5c) returns to the same pressure state, the first pressure chamber Qυ and the second pressure chamber (c) also return to the same pressure state. However, both positive mechanics Qυ@ do not return to the same pressure state, and until now the spool (towards ) is again slid in the direction of the first pressure chamber υ through the biasing action of the spring (a), as shown in FIG.
) (19b) is cut off by the spool (a). The supply of lubricating oil to the supply groove (9) is stopped by blocking the supply path (19a) and (19b) with the spool (A).

In the second embodiment shown in FIGS. 5 and 6, FIG. 6 is a diagram showing the operating state of the on-off valve mechanism αη when the operation is stopped, and when the operation is stopped, both scrolls are The compression chamber formed between (7b) and (8b) (
25a) (25b) (25c) and discharge chamber (
Since no pressure is generated in spool C3
3 is in a state of being lowered in the second pressure chamber (7) due to its own weight. Since the spool 0 is in the downward state, the narrowed portion (to) is in a state where it is closed by the ball valve Gυ.

In other words, the oil supply path (19a) and (19b) are in a state of being cut off.

In the state where the narrowing part is closed by the ball valve 0υ, the rotating suflow roll (8) is driven by driving the drive shaft α through the connection operation of the electromagnetic clutch (not shown).
The compression chamber (25a) (25bX25c
), and the compressed refrigerant gas is sent into the discharge chamber 03) through the discharge holes, and the refrigerant gas is This is the same as in the first embodiment in that the lubricating oil is separated. However, in this embodiment, the compression chamber (25a) and the second pressure chamber (to) are provided so as to be able to communicate with each other through the communication passage (to), so that the compression chamber (25a) and the second pressure chamber (to) can communicate with each other through the oscillating rotation of the rotating scroll as described above. The refrigerant gas compressed in the compression chamber (25a), more specifically, the refrigerant gas immediately before being sent into the discharge chamber α3) through the discharge hole α■ in the compression chamber (25a) passes through the communication path 03) and is transferred to the second pressure chamber (toward the second pressure chamber). ).

This gas pressure is caused by overcompression, which causes the refrigerant gas in the compression chamber (25a), which is slightly higher than the discharge pressure, to move to the second pressure chamber (25a).
By being fed into the second pressure chamber (to), the spool 02 is pushed upward in the second pressure chamber (to) by its pressure. Then, as the spool (321 is pushed upward, the ball valve 01) is moved to the small diameter portion oa'
is lifted from the valve seat (c)′ through the narrowed part (to)
will be held. That is, as shown in Fig. 5, the oil supply path (19a) (
19b) communicates through the narrowed part (two barrels).

On the other hand, the refrigerant gas compressed in the compression chamber (25a) is fed into the discharge chamber 031, so that the compression chamber (25a)
25b) A higher pressure state is obtained than in the (25c) part. That is, the discharge chamber Q31 and the compression chamber (25b) (25c
) creates a pressure difference between Since a pressure difference is generated between the discharge chamber 0 and the compression chambers (25b) and (25c) in this way, the lubricating oil stored in the oil reservoir θ is transferred to the oil supply path (25b) and (25c) through the pressure difference. 19aH19b) and into the supply groove (9) carved in the tip of the scroll piece (7b).

When the operation is stopped again, each compression chamber (25
a) As the pressure in (25bH25c) decreases, the pressure in the second pressure chamber (25a) communicating with the compression chamber (25a) via the communication path (25c) also decreases. As the pressure in the second pressure chamber (end) decreases, spool 03, which had been pushed upward until now, is lowered by its own weight.

Due to the descent of the same spool, the path has been
The ball valve r31), which had been lifted by the valve holder, is also placed on the valve seat -', thereby closing the narrowed portion (c). That is, the oil supply passages (19a) and (19b) are cut off, and the supply of lubricating oil to the supply groove (9) is stopped. In addition,
Although the oil supply passage (19b) is opened at a position where it is always in contact with the rotating scroll, it may be provided at the base of the fixed scroll which is intermittently open to the compression chamber space.

The present invention is configured as described above, and the oil sump provided in the discharge chamber and the supply groove carved in the end face of the fixed scroll are communicated with each other by an oil supply passage, and the fixed scroll is fixed. Supply of lubricating oil in which lubricating oil stored in an oil reservoir is pumped into a supply groove through a pressure difference between a compression chamber formed in a spiral shape between a scroll and a rotating scroll and a discharge chamber. In the mechanism, an on-off valve for shutting off the oil supply passage is provided in the oil supply passage so that the oil supply passage can be opened and closed by changing the pressure inside the compressor. It has become possible to cut off the oil supply path and automatically switch the lubricant supply to S# when the compressor operation is stopped. The conventional problem of overflowing and stagnation of lubricating oil in the compression space, which causes liquid compression when restarting operation, has been resolved.

[Brief explanation of drawings]

1 to 4 are drawings showing the first embodiment, in which FIG. 1 is a side cross-sectional view of the scroll compressor (cross-sectional view taken along line B-C-D-E in FIG. 2), and FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIGS. 3 and 4 are sectional views showing the operating state of the on-off valve mechanism. 5 and 6 are drawings showing the second embodiment, in which FIG. 5 is a side sectional view of the scroll compressor, and FIG. 6 is a sectional view showing the operating state of the on-off valve mechanism. . (1) Housing, (2) Front housing, (2a
) Front wall, (2b) Peripheral wall, (3) Rear housing, (
3a) Rear wall, (3b) peripheral wall, (4) partition panel, (4)
'Through hole, (5) Suction chamber, (6) Compression chamber, (Force fixed scroll, (7a) Base, (7b) Scroll piece, (
8) Rotating scroll, (8a) base, (8b) scroll piece, (9) supply groove, quaternary inlet, αη axis bearing, (2)
Drive shaft, (6)' crankshaft, 0I discharge chamber, Q3' oil sump, α→discharge port, (b) discharge hole, Q*'discharge valve, MI
Jtainer, (1'/l on-off valve mechanism, α-frame pulp body,
01 Oil supply tube, (19a) (19b) Oil supply path, (1) Spool, small diameter part of the ridge, ■η 1st pressure chamber, (a) 2nd pressure chamber, continuous passage, -' port, (Foundation) communication passage , (Foundation) 'Boat, (C) Compression chamber, (A) Spring, Overhead boss, (To) Narrowing part, To) 'Valve seat, Overhead 1st pressure chamber, (To) 2nd pressure chamber, G
η ball valve, rock spool, Q' small diameter section, (to) communication path,
(b) Balance weight. Patent applicant Toyota Industries Corporation 11 Figure 486-DI8hi. Pi

Claims (1)

[Claims] 11) In a scroll type compressor in which a rotating scroll is engaged with a fixed scroll so as to be able to swing and rotate freely, and a spiral pressure chamber is formed between both scrolls, an oil sump in a discharge chamber and a sliding In the mechanism in which the sliding part is communicated with the sliding part through an oil supply path and lubricating oil stored in the oil reservoir is supplied to the sliding part through the pressure difference generated between the discharge chamber and the compression chamber, An on-off valve is provided for the moe, and the on-off valve is located inside the compressor (・
A lubricating oil supply mechanism in a scroll compressor is provided that can be opened and closed by the resulting differential pressure. (2) Claim 1, wherein the on-off valve is opened and closed through a change in the pressure difference generated between the compression chambers.
Lubricating oil supply mechanism in the scroll compressor described in Section 1. 3) The supply of lubricating oil in a scroll type compressor according to claim 1, wherein the opening/closing valve is opened and closed by a change in pressure generated between the compression chamber and the discharge chamber. mechanism.