JPH059601B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid machine used as a compressor of a refrigeration system.

(Prior art) Conventionally, as this type of scroll type fluid machine,
Something like the one shown in the figure has already been proposed.

Thus, the scroll type fluid machine has a fixed scroll 3 supported on a frame 2 fixed inside a casing 1, and a movable scroll 4 on a portion of the frame 2 facing the fixed scroll 3, and an end plate 4a of the movable scroll 4. , is slidably supported via a thrust bearing 5 interposed between a catch seat a integrally extending inward from the center from the frame 2, and one end is connected to the motor M to the frame 2. A counterweight 8 is interposed between the movable scroll 4 and the drive shaft 6 and has a drive pin 7 at an eccentric position with respect to the drive shaft 6, A swing link 9 connected by the drive pin 7 is arranged on the upper side of the counterweight 8, and the boss portion 4b of the movable scroll 4 is supported at the center of the swing link 9 via a radial bearing 10. On the other hand, on the upper side of the swing link 9, between the movable scroll 4 and the frame 2, a pair of keys 13a and 13b are provided which engage with key grooves 11 and 12 formed in the frame 2 and the movable scroll 4, respectively. An Oldham ring 13 having a diameter is interposed, and the movable scroll 4 is driven to revolve through the counterweight 8, swing link 9, Oldham ring 13, etc. as the drive shaft 6 rotates.

By the way, in the above scroll type fluid machine, a catch seat a extending inward from the center is integrally formed on the frame 2, and the end plate 4a of the movable scroll 4 is mounted on the catch seat a via the thrust bearing 5. Because it was supported so that it could slide, the following problems arose.

That is, recently, in order to perform inverter operation, it is required to increase the speed of the scroll type fluid machine, but when increasing the speed of this scroll type fluid machine, it is necessary to move the movable scroll 4 at high speed. Therefore, the radial bearing 10 that supports the boss portion 4b of the movable scroll 4 must be made large, and the counterweight 8, swing link 9, etc. must also be made large accordingly.

However, when the counterweight 8, swing link 9, etc. are enlarged, the inner diameter of the center hole of the seat a provided in the frame 2 is increased in order to make it possible to incorporate these swing links 9, etc. into the frame 2. It is necessary to form a large space inside the center hole of the catch seat a to allow the insertion of the swing link 9, etc., but when doing so, as the center hole of the catch seat a becomes larger, The inner diameter of the thrust bearing 5 interposed in the catch seat a also becomes larger, and the end plate 4a of the movable scroll 4 supported by the thrust bearing 5 has to be made larger.

However, when the end plate 4a is formed to be large as described above, the weight of the movable scroll 4 becomes large, and accordingly, the inertia force during rotational driving becomes large, causing the keys 13a, 13 of the Oldham ring 13 to become large.
The surface pressure acting on the sliding parts of b also increases, and therefore the wear and tear of each sliding part when the movable scroll 4 is driven to rotate becomes very large. It is not possible to make a fluid machine faster.

Therefore, in order to solve the above-mentioned problems, an annular stepped portion having an opening that allows the counterweight 8, swing link 9, etc. to be inserted inward is formed in the frame 2. Frame 2
, the counterweight 8 and the swing link 9
A support body having a center hole having a diameter smaller than the outer diameter of the swing link 9, etc. is formed separately from the frame 2, and the support body is attached to the frame 2. The end plate 4 of the movable scroll 4 is fixed to the step part of the movable scroll 4 through the support body.
The idea was to support the movable scroll 4 so that it can slide freely.
This makes it possible to handle higher speeds without increasing the weight or inertia of the vehicle.

(Problems to be Solved by the Invention) However, with the above configuration, the following new problems have arisen.

That is, in the scroll type fluid machine,
The lubricating oil pumped up through the inside of the drive shaft 6 is supplied from the radial bearing 10 of the swing link 9 to the thrust bearing 5 between the frame 2 and the movable scroll 4. In order to lubricate the bearing 10, as described above, a center hole having a smaller diameter than the outer diameter of the swing link 9 is formed on the stepped portion of the frame 2 at the upper position of the swing link 9, etc. When the support body having the above-mentioned structure is installed, it is difficult to supply the thrust bearing 5 with the lubricating oil supplied from the radial bearing 10, and a problem arises in which the lubrication function of the thrust bearing 5 is impaired. .

The present invention has been made in view of the above problems, and its object is to provide a lubricating oil guide on the movable scroll side end face of the outer ring in the radial bearing, and to supply lubricating oil from the radial bearing with the guide. To provide a scroll type fluid machine that can reliably supply oil to the thrust bearing while being able to cope with high speeds by scattering and guiding lubricating oil to the thrust bearing.

(Means for Solving the Problems) As shown in FIG. The scroll type fluid machine is rotatably supported through a scroll member 10, which has a center hole 14a having a diameter smaller than the outer diameter of the swing link 9, and supports an end plate 4a of the movable scroll 4 near the center hole 14a. A support body 14 having a thrust bearing 5 and a key groove 11 is formed independently of the frame 2, and the support body 14 is attached to the frame 2, and the outer ring 10a of the radial bearing 10 is attached to the frame 2. The present invention is characterized in that an oil guide body 15 is provided on the movable scroll side end face for guiding the lubricating oil supplied to the radial bearing 10 to the thrust bearing 5.

(Function) By forming the support body 14 separately from the frame 2 and supporting the movable scroll 4 and the Oldham ring 13 via the support body 14, even the swing link 9, etc. Even when increasing the size to enable high-speed response,
The swing link 9 and the like can be easily assembled into the frame 2 with the support 14 removed, and by supporting the end plate 4a of the movable scroll 4 via the support 14,
There is no need to make the movable scroll 4 particularly large, and therefore it becomes possible to cope with higher speeds without increasing inertial force or causing large wear and tear. Further, as the swing link 9 rotates, the guide plate 15 provided on the movable scroll side end surface of the outer ring 10a of the radial bearing 10 causes the lubricating oil supplied to the radial bearing 10 to be transferred to the thrust bearing 5. As a result, the thrust bearing 5 is lubricated.

(Example) A scroll type fluid machine according to the present invention will be explained below with reference to an example shown in the drawings.

The scroll type fluid machine shown in FIG. 1 has a fixed scroll 3 supported by a frame 2 fixed inside a sealed casing 1, and a movable scroll 4 mounted on a thrust bearing at a portion of the frame 2 facing the fixed scroll 3. A drive shaft 6, one end of which is connected to a motor M, is rotatably supported by the frame 2 via a ball bearing BR.

Further, a counterweight 8 having a drive pin 7 protruding from an eccentric position with respect to the drive shaft 6 is interposed between the movable scroll 4 and the drive shaft 6, and on the upper side of the counterweight 8, A swing link 9 integrally connected by the drive pin 7 is disposed, and a boss portion 4b integrally formed in the center of the swing link 9 and protruding from the lower surface side of the end plate 4a of the movable scroll 4 is provided on the outer side. The movable scroll 4 and the frame 2 are supported on the upper side of the swing link 9 while being supported via a radial bearing 10 consisting of a ring 10a and a rotating body 10b.
An Oldham ring 13 having a set of two keys 13a and 13b that engages a set of two key grooves 11 and 12 provided on the frame 2 and the movable scroll 4, respectively, is interposed between them. As the drive shaft 6 rotates, the movable scroll 4 is driven to revolve via the counterweight 8, swing link 9, Oldham ring 13, and the like.

However, in the scroll-type fluid machine as described above, the center hole 14a has a smaller diameter than the outer diameter of the counterweight 8, swing link 9, etc.
, the thrust bearing 5 for slidably supporting the end plate 4a of the movable scroll 4 is arranged near the center hole 14a, and the Oldham ring 1
A support body 14 provided with a keyway 11 for receiving one of the keys 13a is formed independently of the frame 2, and the support body 14 is connected to the frame 2 via a plurality of fixing bolts B. At the same time, the radial bearing 10 is attached to the movable scroll 4 side of the outer ring 10a of the radial bearing 10.
An oil guide body 15 is formed in a protruding manner to scatter and guide lubricating oil supplied to the thrust bearing 5 to the thrust bearing 5.

Specifically, an annular stepped portion 2b having an opening 2a through which the counterweight 8, swing link 9, etc. can be inserted is integrally formed on the upper side of the frame 2, and the frame 2 is inserted through the opening 2a. The counterweight 8 and the swing link 9 are located inside the upper part of the
etc., as if assembled, and the stepped portion 2b.
The supporting body 14, which is formed separately from the frame 2, is attached to the upper part of the frame 2 using the fixing bolt B, so that the movable scroll 4 and the Oldham ring 13 are supported through the supporting body 14.

As is clear from FIG. 2, the support body 14 has a generally ring-shaped overall appearance, with a central hole in the center having a diameter smaller than the outer diameter of the counterweight 8, swing link 9, etc. 14a
At the same time, the center hole 14 of the support body 14 is opened.
Two key grooves 11, 11 extending from the a side toward the outer circumferential edge are formed in a facing manner, and in each of the key grooves 11, two grooves are provided in the Oldham ring 13 in a facing manner.
A set of keys 13a is interposed therein, and a plurality of insertion holes 14b are formed in the outer circumference of the support body 14, through which the fixing bolts B pass.

And the support body 14 formed as above,
The thrust bearing 5 is fixedly supported on the step portion 2b of the frame 2, and the thrust bearing 5 is provided on the upper surface side of the support body 14, and the end plate 4a of the movable scroll 4 and the Oldham ring 13 are slid through the thrust bearing 5. Support freedom of movement.

Further, the oil guide body 15 is connected to the radial bearing 1.
The outer ring 10a constituting the outer ring 10a is integrally formed on the upper side facing the movable scroll 4, and is interposed between the movable scroll 4 and the support body 14 on the inner circumferential wall surface of the guide body 15. The radial bearing 10 is provided with an inclined surface 15a that is inclined toward the thrust bearing 5 to be mounted.
The lubricating oil supplied to the guide body 15 is scattered and guided toward the thrust bearing 5 by the inclined surface 15a provided on the guide body 15, so that the thrust bearing 5 is lubricated.

(Effects of the Invention) As explained above, the scroll type fluid machine according to the present invention has a center hole 14a having a diameter smaller than the outer diameter of the swing link 9, etc., and the movable scroll 4 is provided near the center hole 14a. A support body 14 in which a thrust bearing 5 for supporting the end plate 4a is disposed, and a key groove 11 for receiving one key 13a formed in the Oldham ring 13 is provided.
is formed independently of the frame 2, and the support 14
is attached to the frame 2, and an oil guide body 15 is provided on the movable scroll side end surface of the outer ring 10a of the radial bearing 10 to scatter and guide the lubricating oil supplied to the radial bearing 10 to the thrust bearing 5. Because I did it like this,
Even if the swing link 9 or the like is to be increased in size to enable high-speed operation, the swing link 9 or the like can be easily assembled to the frame 2 with the support body 14 removed; By supporting the end plate 4a of the movable scroll 4 with the support body 14, there is no need to make the movable scroll 4 particularly large as in the conventional case.
Therefore, it may cause an increase in inertia and large wear and tear,
Additionally, it has become possible to handle higher speeds without increasing weight. Moreover, even though it is possible to cope with higher speeds as described above, the lubricating oil that has reached the radial bearing 10 can be reliably supplied to the thrust bearing 5 by the guide body 15. In other words, the guide body By providing the body 15, it is possible to reliably supply oil to the thrust bearing 5, and at the same time, it is possible to make the scroll type fluid machine capable of responding to higher speeds.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of the scroll-type fluid machine according to the present invention, FIG. 2 is a plan view of the support body,
FIG. 3 is a sectional view showing a conventional example. 2... Frame, 4... Movable scroll, 4a...
End plate, 5... Thrust bearing, 6... Drive shaft, 7...
... Drive pin, 9 ... Swing link, 10 ... Radial bearing, 10a ... Outer ring, 11 ...
...Keyway, 14...Support, 14a...Center hole,
15...Oil guide body.

Claims (1)

[Claims] 1. In a scroll type fluid machine in which a movable scroll 4 is rotatably supported via a radial bearing 10 installed in a swing link 9 which is pivotally connected to a drive pin 7 provided at an eccentric position of a drive shaft 6, the swing link 9 is Center hole 1 with a smaller diameter than the outer diameter
4a, a thrust bearing 5 for supporting the end plate 4a of the movable scroll 4 is provided near the center hole 14a, and a keyway 11 is provided.
is formed independently from the frame 2, and the support body 14 is attached to the frame 2, and the lubricating oil supplied to the radial bearing 10 is applied to the movable scroll side end surface of the outer ring 10a of the radial bearing 10. , a scroll type fluid machine characterized in that an oil guide body 15 is provided to guide the thrust bearing 5.