JPH0441987A - Scroll compressor - Google Patents

Abstract

PURPOSE:To make it possible to supply oil to a thrust bearing by arranging a balancer outside a frame to suppress increase in viscous resistance due to stiring of the balancer, thereby using a space within the balancer as a part of a forcible oil supply passage. CONSTITUTION:Lubricating oil in an oil sump 11 of an enclosed vessel 10 is drawn up by a displacement type pump 5 at the lower end of a spindle 5. Most of the drawn lubricating oil acts to lubricate a first bearing 3b of a first frame 3 and a swing bearing 2e of a swing scroll 2, and it then reserved in a space 3c within the frame. In addition, the space 3c does not include balancers 5c and 5d, thereby causing no stiring loss of oil. The oil is made to pass through an oil inlet space 3f provided on a thrust bearing 3a of the first frame 3, and to flow in a circumferential oil supply groove 2d provided on a thrust surface 2b of the swing scroll 2. The oil allowed to flow out of the oil inlet space 3f is divided into two flows, each running within the circumferential oil supply groove 2d by 180 deg., and is joined to be discharged from an oil outlet space 3g to the outside of the first frame 3 through an oil drop hole 3d.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a scroll compressor used, for example, in a refrigerant circuit of an air conditioner or a refrigerator.

[Conventional technology]

FIG. 3 is a configuration diagram of a conventional scroll compressor disclosed in, for example, Japanese Patent Application Laid-Open No. 1-249974. has been done. Reference numeral 2 designates an oscillating scroll in which a vortex wrap 2a combined with the above-mentioned vortex wrap 1a is provided on a base plate 2h, and a thrust surface 2b receiving thrust force, a oscillating shaft 2c, and an oscillating bearing 2e are provided at the bottom of the base plate 2f. . The frame 3 is fixed to the closed container 10, and the thrust surface 2 of the oscillating scroll 2 is fixed to the thrust bearing 3a.
b is slidably supported, and the main shaft 5 is supported rotatably in the radial direction by the first bearing 3b.

The main shaft 5 is rotationally driven by an electric motor 8, and a crank bin 5a at the upper end of the main shaft 5 causes the swinging scroll 2 to swing through its swing bearing 2e. 7 is an Oldham joint,
It is supported by the mate of the swinging scroll 2 and the frame 3 so as to be able to freely slide back and forth, and restrains the rotation of the swinging scroll 2. The bottom of the sealed container 10 is an oil reservoir 11, and the lubricating oil in the oil reservoir 11 is pumped up by a centrifugal pump 5b provided on the main shaft 5.

On the other hand, an orbiting oil groove 2d is provided in the thrust surface 2b of the orbiting scroll 2, and the orbit oil groove 2d is connected to a space A2f formed by the orbiting scroll 2 and the main shaft 5,
They are communicated through a communication hole 2g provided in the swinging scroll 2. In addition, the space B3c provided in the frame 3
A balancer 5C is housed in the holder, and there is an oil passage hole 3d at the bottom of the balancer 5C.
is open.

Next, the operation will be explained. Note that since this invention relates to the oil supply path of the scroll compressor, a description of the compression operation of the scroll compressor will be omitted.

The lubricating oil pumped up by the centrifugal pump 5b is
After lubricating the bearing 3b and the swing bearing 2e, it is guided to the space A2f formed by the swing scroll 2 and the main shaft 5. The lubricating oil in the space A2f passes through a communication hole 2g provided in the swinging scroll 2 and is guided to a circumferential oil supply groove 2d formed in the thrust surface 2b of the swinging scroll 2, and forcibly lubricates the thrust bearing 3a. The oil thus lubricated is collected in the space B3c and returned to the oil reservoir 11 at the bottom through the oil passage hole 3d.

[Problem to be solved by the invention]

Since the conventional scroll compressor is configured as described above, oil is supplied to the circumferential oil supply groove 2d provided in the thrust surface 2b of the oscillating scroll 2 through the communication hole 2g inside the oscillating scroll. However, there was a problem that machining the communication hole 2g was difficult and the machining cost was high. In addition, the oil that lubricates the first bearing 3b and the swing bearing 2e and is diverted to the space B3c in the frame 3 while being led to the space A2f is directly drained from the oil passage hole 3d and is used to lubricate the thrust bearing 3a. As a result, in order to ensure stable oil supply to the thrust bearing 3a, the space A2f must be
It is necessary to provide a means for refueling all parts through a single oil supply passage, and the machining work for this purpose is extremely troublesome and the machining cost is also high.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a scroll compressor that has a simple configuration and is capable of stably supplying oil to a circumferential oil supply groove on a thrust surface of an oscillating scroll.

[Means to solve the problem]

A scroll compressor according to the present invention includes a fixed scroll and an oscillating scroll each having a combination of volute wraps in a closed container, and both volute wraps forming a compression chamber. The refrigerant is compressed by the compression chamber by the driving force of the electric motor through the main shaft connected to the main shaft, and the thrust force acting on the oscillating scroll is supported by the thrust bearing, and the oil sump at the bottom of the closed house container is In a scroll compressor in which lubricating oil is supplied by an oil supply pump to the thrust bearing, the main bearing that supports the radial load of the main shaft, and the oscillating bearing that supports the radial load of the oscillating scroll, the balancer is placed outside the frame. , After lubricating the ball bearing and the rocking bearing with the lubricating oil pumped up by the oil supply pump, the lubricating oil is introduced into the frame interior space that supports the thrust bearing and the main bearing,
It is characterized by providing a series of oil supply paths that lead the oil to a circumferential oil supply groove formed on the thrust load receiving pressure surface of the oscillating scroll, then lubricate the thrust bearing, and then drain the oil to the external space of the frame.

[Function] In this invention, since the balancer is placed outside the frame, even if the space inside the frame is filled with lubricating oil, viscous resistance due to agitation of the balancer does not occur, and the space is used as a forced oil supply path. It can be used as a part to supply oil to the thrust bearing.

(Example) Hereinafter, an example of the present invention will be explained with reference to the drawings.
The figure shows a configuration diagram of a scroll compressor according to the present invention. In the figure, the same parts as those of the conventional scroll compressor shown in FIG.

The main shaft 5 that drives the swinging scroll 2 is connected to the first frame 3
The electric motor 8 is rotatably supported in the radial direction by a first bearing 3b provided on the frame 4 and a second bearing 4a provided on the second frame 4 on both sides of the electric motor 8. In addition, the main shaft 5
An electric motor rotor 9 is shrink-fitted to the motor rotor 9, and a first balancer 5C is caulked to the upper part of the electric motor rotor 9, and a second balancer 5d is caulked to the lower part. Further, a positive displacement pump 5b is attached to the lower end of the main shaft 5, and pumps up lubricating oil accumulated in an oil reservoir 11 at the bottom of the closed container 10.

FIG. 2 shows the thrust surface 2b of the orbiting scroll 2 and the first
3 is a perspective view of a main part of a thrust bearing 3a of a frame 3. FIG. In FIG. 2, in order to communicate between the space B 3 c inside the frame and the orbiting oil groove 2 d provided in the thrust surface 2 b of the orbiting scroll 2 and having a sufficient passage cross-sectional area, a first An oil inlet space 3f is provided in the thrust bearing 3a of the frame 3. On the other hand, an oil outlet space 3g is provided in the thrust bearing 3a at a position 180 degrees opposite to the oil inlet space 3f for the purpose of communicating the circumferential oil supply groove 2d and the oil drop hole 3d. This oil outlet space 3g does not communicate with the space B3c, and the orbiting oil supply groove 2d also extends to the center side of the thrust bearing 3a, that is, the space B3c, when the swinging scroll 2 swings. It is formed on the outer circumferential side, that is, at a position that does not communicate with the movement space of the Oldham ring.

Next, the operation of the oil supply path in the scroll compressor of the present invention will be explained.

In FIG. 1, the lubricating oil accumulated in the oil reservoir 11 at the bottom of the closed container 10 is pumped up by a positive displacement pump 5b attached to the lower end of the main shaft 5, and a part of it is pumped up by the second bearing of the second frame 4. 4a, but most of the rest is guided by the first bearing 3b of the first frame 3 and the swinging scroll 2.
After lubricating the swing bearing 2e, the lubricant temporarily accumulates in the space B3c inside the frame. By the way, sky I? Since no balancer is installed in 71B3c, there is no oil agitation loss caused by the balancer.The oil accumulated in space B3c is not provided with an oil pit that directly communicates with the outside of the first frame 3, so it is removed as shown in Fig. 2. As shown, the thrust bearing 3 of the first frame 3
The oil flows into the orbiting oil supply groove 2d provided in the thrust surface 2b of the orbiting scroll 2 through the oil inlet space 3f provided in the oil inlet space 3f provided in the oscillating scroll 2. In other words, the thrust bearing 3a is forcibly lubricated by the positive displacement pump 5b. Thereafter, the lubricating oil that has flowed in from the oil inlet space 3f is divided into two directions, flows through 180 degrees in the circumferential oil supply groove 2d, and joins again to the oil outlet space 3g.
guided by. In addition, since the passage cross-sectional area of the circumferential oil supply groove 2d is set to be sufficiently large, even if the amount of oil supply is large depending on the operating speed of the compressor, the oil supply passage will not be constricted by the circumferential oil supply groove 2d. Even if the amount is small, the oil flows along the thrust bearing 3a within the circumferential oil supply groove 2d, so that the thrust bearing 3a is sufficiently lubricated.

Further, the orbiting oil groove 2d makes an oscillating movement in synchronization with the oscillating movement of the oscillating scroll 2, but at that time, the thrust bearing 3a
Since the lubricating oil does not protrude from the thrust bearing 3a and communicate with the space on the center side or the outer circumferential side of the thrust bearing 3a, the flow of lubricating oil in the circumferential oil supply groove 2d flows in a fixed direction, and stagnation or backflow does not occur. Stable lubrication can be achieved almost uniformly over the entire surface. In this way, the oil led to the oil outlet space 3g is discharged to the outside of the first frame 3 through the oil pit 3d.

〔Effect of the invention〕

As explained above, according to the present invention, after lubricating the main bearing and the swing bearing with the lubricating oil pumped up by the oil supply pump, the lubricating oil is guided into the space within the frame that supports the thrust bearing and the main bearing, and We have provided a series of oil supply paths that lead the oil to the circumferential oil groove formed on the thrust load receiving pressure surface, then lubricate the thrust bearing, and then drain the oil to the external space of the frame, resulting in low processing costs and a simple configuration. Moreover, stable oil supply to the thrust bearing is possible.

As a result, reliability of the thrust bearing can be improved and performance can be improved by reducing mechanical loss in the thrust bearing.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a scroll compressor according to an embodiment of the present invention, Fig. 2 is a perspective view of the main parts of the thrust surface of the oscillating scroll and the thrust bearing of the first frame, and Fig. 3 is a conventional scroll compressor. FIG. 1... Fixed scroll, 1a... Spiral wrap, 2.
...the scroll, 2a... spiral wrap, 2b.
... Thrust surface, 2c... Swing shaft, 2d... Orbiting oil groove, 2e... Swing bearing, 2f... Space A, 3...
・First frame, 3a... Thrust bearing, 3c...
Space B, 3d...oil passage hole, 4...second frame,
5... Main shaft, 5b... Positive displacement pump, 5c... First balancer, 5d... Second balancer, 7... Oldham ring, 8... Electric motor, 1o... Sealed container, 11
...Oil puddle. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] having spiral wraps each assembled in a closed container;
It is equipped with a fixed scroll and an oscillating scroll in which a compression chamber is formed by both spiral wraps, and the oscillating scroll is oscillated by the driving force of an electric motor through a main shaft connected to the scroll, and the refrigerant is pumped through the compression chamber. The thrust force that is compressed and acts on the oscillating scroll is supported by the thrust bearing, and the lubricating oil in the oil reservoir at the bottom of the sealed container is supplied to the thrust bearing, the main bearing that supports the radial load of the main shaft, and the oscillating scroll. In a scroll compressor configured to supply oil to a rocking bearing that supports a radial load, a balancer is disposed outside the frame, and after the main bearing and the rocking bearing are lubricated with lubricating oil pumped up by the oil supply pump, A series of lubricating oil is introduced into the space within the frame that supports the thrust bearing and main bearing, and into the circumferential oil groove formed on the thrust load receiving pressure surface of the oscillating scroll.Then, after lubricating the thrust bearing, the oil is drained into the external space of the frame. A scroll compressor characterized by having an oil supply path.