JPH0511229B2 - - 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, one as shown in FIG. 3 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 which rotatably supports the driven shaft 6 and has a driving pin 7 located eccentrically with respect to the driving shaft 6 between the movable scroll 4 and the driving shaft 6; An eccentric rotating part 89 consisting of a swing link 9 connected by the driving pin 7 is disposed on the upper side of the drive pin 8, and the eccentric rotating part 89 is located at the center of the swing link 9 constituting the eccentric rotating part 89. The boss portion 4b of the movable scroll 4 is supported via a radial bearing 10 at a position eccentric to the axial center of the shaft 6, while the boss portion 4b of the movable scroll 4 is supported between the movable scroll 4 and the frame 2 on the upper side of the swing link 9. To,
A pair of keys 1 that engage with key grooves 11 and 12 formed in the frame 2 and the movable scroll 4, respectively.
3a, 13b is interposed, and as the drive shaft 6 rotates, the counterweight 8 and swing link 9 constituting the eccentric rotating part 89, and the movable scroll are connected via the Oldham ring 13. 4 is driven to revolve.

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 is supported in a slidable manner, 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 in order to increase the speed of this scroll type fluid machine, it is necessary to move the movable scroll 4 at high speed. Therefore, it is necessary to make the radial bearing 10 that supports the boss portion 4a of the movable scroll 4 large, and to make the counterweight 8, swing link 9, etc. that constitute the eccentric rotating shaft portion 89 also large. There is.

Therefore, when the counterweight 8, swing link 9, etc. that constitute the eccentric rotating part 89 are enlarged, in order to be able to incorporate them into the frame 2, a center hole of the seat a provided in the frame 2 is provided. It is necessary to make the inner diameter large to ensure a large space inside the center hole of the catch seat a to allow the insertion of the swing link 9, etc., but in this case, the center hole of the catch seat a becomes large. Accordingly, the inner diameter of the thrust bearing 5 installed in the catch seat a becomes larger, and it becomes necessary to make the end plate 4 of the movable scroll 4 supported by the thrust bearing 5 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 the inertial force during rotational driving increases accordingly, causing the keys 13a, 13 of the Oldham ring 13 to
The surface pressure acting on the sliding parts of b also becomes large, and therefore, the wear loss of each sliding part when the movable scroll 4 is driven to rotate becomes very large.
For this reason, it is not possible to increase the speed of the scroll-type fluid machine in its current state.

Therefore, in order to solve the above problems, an annular stepped part is formed in the frame 2, which has an opening that allows the counterweight 8, swing link 9, etc. that constitute the eccentric rotating part 89 to pass inward. The counterweight 8, the swing link 9, etc. can be attached to the frame 2 through the opening, and the support body has a center hole having a diameter smaller than the outer diameter of the swing link 9. It is considered that the support body is formed separately from the frame 2 and is fixed to the stepped portion of the frame 2, so that the end plate 4a of the movable scroll 4 is slidably supported via the support body. By doing so, it is possible to cope with higher speeds without increasing the size of the movable scroll 4, that is, without increasing the weight or inertia of the movable scroll 4.

(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 diameter smaller 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 lubricating oil supplied from the radial bearing 10 to the thrust bearing 5, and a problem arises in which the lubrication function of the thrust bearing 5 is impaired. be.

The present invention has been made in view of the above-mentioned problems, and its object is to form a protruding part on the end face of the eccentric rotating part on the movable scroll side to receive the axially upper side of the radial bearing in a protruding shape. By scattering and guiding the lubricating oil supplied from the radial bearing from the protrusion to the thrust bearing, the thrust bearing can be reliably lubricated. By reducing the height of the eccentric rotating portion in accordance with the protruding length of the radial bearing, the boss portion of the movable scroll can be shortened, and the eccentric rotating portion can be made thinner. The object of the present invention is to provide a scroll-type fluid machine that can respond well to high speeds as a whole.

(Means for Solving the Problems) The present invention provides a scroll-type fluid system in which a movable scroll 4 is rotatably supported on an eccentric rotating portion 89 of a drive shaft 6 via a radial bearing 10, as shown in FIG. The machine has a center hole 14a having a diameter smaller than the outer diameter of the eccentric rotating part 89, and an end plate 4a of the movable scroll 4 near the center hole 14a.
A support body 14 provided with a thrust bearing 5 for supporting is formed independently of the frame 2, and the support body 14 is attached to the frame 2. , a protrusion 9b is formed to protrudely receive the upper side of the radial bearing 10 in the axial direction, and the radial bearing 10 is disposed in a protrusion from the end surface 9a;
The present invention is characterized in that the height dimension of the eccentric rotating portion 89 is reduced in accordance with the length of the axially upper side of the radial bearing 10 that protrudes by b.

(Function) By forming the support body 14 that supports the movable scroll 4 independently from the frame 2, the eccentric rotating portion 8 can be easily rotated without increasing the size of the movable scroll 4.
Therefore, the ease of assembly of 9 can be ensured.

Moreover, by forming a protrusion 9b on the end surface 9a of the eccentric rotating part 89 on the movable scroll 4 side to receive the axially upper side of the radial bearing 10 in a protruding manner, lubricating oil supplied from the radial bearing 10 is formed. is scattered and guided from the protruding portion 9b to the thrust bearing 5, and the thrust bearing 5 is lubricated. The eccentric rotating part 89 is arranged in a protruding manner and the height of the eccentric rotating part 89 is reduced according to the length of the axially upper side of the radial bearing 10 protruding from the protruding part 9b. Not only can it be made thinner, but also the supporting portion (boss portion) of the movable scroll 4 supported by the eccentric rotating portion 89 to the eccentric rotating portion can be shortened.

(Embodiments) A scroll-type fluid machine according to the present invention will be described below with reference to embodiments 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, between the movable scroll 4 and the drive shaft 6, there is a counterweight 8 having a drive pin 7 protruding from an eccentric position with respect to the drive shaft 6, and a counterweight 8 with a drive pin 7 provided on the upper side of the counterweight 8. An eccentric rotating part 89 is arranged, and the eccentric rotating part 89 consists of a swing link 9 that is integrally connected at 7.
At the center of the swing link 9 constituting the swing link 9, at a position eccentric to the axis of the drive shaft 6,
A boss portion 4b integrally formed on the lower surface side of the end plate 4a of the movable scroll 4 is supported via a radial bearing 10 consisting of an outer ring 10a, a rotating body 10b, etc., while on the upper side of the swing link 9, Between the movable scroll 4 and the frame 2 side, a set of two keyways 11, 1 are provided on the frame side 2 and the movable scroll 4, respectively.
An Oldham ring 13 having a pair of keys 13a and 13b that engages with the drive shaft 6 is interposed.
As the movable scroll 4 rotates, the movable scroll 4 is driven to revolve via the counterweight 8 and the swing link 9, which constitute the eccentric rotating section 89, and the Oldham ring 13.

Therefore, the scroll type fluid machine as described above has a center hole 14a having a smaller diameter than the outer diameter of the eccentric rotating part 89 constituted by the counterweight 8 and the swing link 9.
A support body 14 is provided with a thrust bearing 5 for supporting the end plate 4a of the movable scroll 4 near the movable scroll 4, and a keyway 11 for receiving one key 13a of the Oldham ring 13 is provided independently of the frame 2. The supporting body 14 is attached to the frame 2 via a plurality of fixing bolts B, and the radial is attached to the end face 9a of the swing link 9 constituting the eccentric rotation shaft portion 89 on the side of the movable scroll 4. The radial bearing 10 is arranged in a protruding manner from the end surface 9a by forming a protruding part 9b that protrudes and receives the upper side of the bearing 10 in the axial direction, and the protruding part 9b
Accordingly, the height of the swing link 9 is reduced in accordance with the length of the axially upper side of the radial bearing 10 that protrudes, thereby reducing the height of the eccentric rotating portion 89 as a whole.

Specifically, an annular stepped portion 2b having an opening 2a through which the counterweight 8 and swing link 9 constituting the eccentric rotating portion 89 are inserted is integrally formed on the upper side of the frame 2. Opening 2a
The counterweight 8, swing link 9, etc. are assembled inside the upper part of the frame 2, and the support body 14 is formed separately from the frame 2 at the upper part of the step portion 2b. are assembled by the fixing bolts B, and the movable scroll 4 and Oldham ring 13 are supported via the support body 14.

Further, 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 external dimensions of the counterweight 8, swing ring 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.

The support body 14 formed as described above is fixedly supported on the step portion 2b of the frame 2, the thrust bearing 5 is provided on the upper surface side of the support body 14, and the movable scroll The mirror plate 4a of No. 4 and the Oldham ring 13 are supported so as to be freely slidable.

The protrusion 9b protruding from the end surface 9a of the swing link 9 is formed in an annular shape along the outer periphery of the outer ring 10a of the radial bearing 10, and the protrusion 9b allows the radial bearing to The height of the swing link 9 is reduced by the height by which the upper side of the swing link 10 in the axial direction protrudes.

In this way, by forming the support body 14 independently of the frame 2, it is possible to secure the mountability of the counterweight 8 and the swing link 9 without increasing the size of the movable scroll 4. The lubricating oil supplied from the bearing 10 is scattered and guided to the thrust bearing 5 from the protrusion 9b, so that the thrust bearing 5 is well lubricated.

Further, as described above, since the height of the swing link 9 constituting the eccentric rotating part 89 can be reduced by the height of the protruding part 9b, the boss part 4 of the movable scroll 4 received in the swing link 9 can be reduced.
b can also be made shorter, and the eccentric rotating portion 89
This makes it possible to make the movable scroll 4 lightweight and to effectively cope with higher speeds.

In addition, since the boss portion 4b protruding downward of the movable scroll 4 is shortened, the tilting of the axis of the movable scroll 4 can be reduced, and deterioration in compression performance can be prevented, and the boss portion 4b
The stress concentration at the root portion protruding from the mirror plate 4a can also be alleviated.

Furthermore, since the height of the swing link 9 is reduced, the height of the drive pin 7 protruding from the counterweight 8 can also be reduced, and stress concentration at the base of the drive pin 7 can be reduced. It is.

(Effects of the Invention) As described above, according to the present invention, even when the eccentric rotating portion 89 such as a swing link is enlarged to be able to cope with higher speeds, the support body 1
4 is removed, the eccentric rotating portion 89 can be easily assembled to the frame 2, and by supporting the end plate 4a of the movable scroll 4 with the support body 14, the movable scroll 4
There is no longer a need to make it particularly large, and therefore, it has become possible to handle higher speeds without increasing inertia, causing large wear and tear, or 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 is transferred to the thrust bearing 5 by the protrusion 9b protruding from the end surface 9a on the movable scroll side. This allows for reliable refueling.

Moreover, since the height of the eccentric rotating part 89 is reduced in accordance with the length of the axially upper side of the radial bearing 10 that projects into the protruding part 9b, the eccentric rotating part 89 and the eccentric rotating part 89 are The weight of the movable scroll 4 supported by the portion 89 via the radial bearing 10 can be reduced, and even higher speeds can be accommodated even more effectively.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a 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, 5... Thrust bearing, 6... Drive shaft, 9a... End face, 9b
...Protrusion part, 10...Radial bearing, 14...Support body, 14a...Center hole, 89...Eccentric rotation part.

Claims (1)

[Claims] 1. In a scroll-type fluid machine in which the movable scroll 4 is rotatably supported on the eccentric rotating part 89 of the drive shaft 6 via the radial bearing 10, the center hole 14a has a smaller diameter than the outer diameter of the eccentric rotating part 89.
A support body 14 having a thrust bearing 5 for supporting the end plate 4a of the movable scroll 4 is formed independently of the frame 2 near the center hole 14a,
The support body 14 is attached to the frame 2, and a protrusion 9b is formed on the end face 9a of the eccentric rotating part 89 on the movable scroll 4 side to receive the axially upper side of the radial bearing 10 in a protruding shape, The radial bearing 10 is arranged to protrude from the end surface 9a, and the height of the eccentric rotating portion 89 is reduced in accordance with the length of the radial bearing 10 on the axially upper side that protrudes from the protrusion 9b. A scroll type fluid machine characterized by: