JPH0874755A - Scroll type oilless fluid machine - Google Patents

Abstract

PURPOSE: To manage the thrust size highly accurately in a simple structure, to simplify the structure and the installing of a thrust bearing part, and to improve the assembly workability, by providing a thrust bearing part to support the thrust surface of the end plate of an oscillating scroll to a frame as a separate part with a cap form. CONSTITUTION: Since a thrust bearing part is composed of a thrust cap 42 installed to a frame 5 as a separate part, the thrust size b including the thrust surface accuracy can be finish processed highly accurately by a single unit of the thrust cap 42, and managed, and as a result, the thrust bearing size (a) of a scroll fluid machine can be managed highly accurately so as to improve the performance of the fluid machine. And since the thrust cap 42 is a cap form, it can be fitted to a groove formed to the frame 5 at one touch, and the size (a) of the thrust bearing can be maintained at a high accuracy, so as to improve the assembly workability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine having a drive device for transmitting the rotational force of an electric element to an orbiting scroll.

[0002]

2. Description of the Related Art A conventional scroll type fluid machine, particularly a compressor, is provided with a scroll compression element and an electric element as disclosed in, for example, Japanese Patent Laid-Open No. 262186/1987, which has a central scroll compression element. A fixed scroll having a frame having a bearing on its end, an end plate fixed to the frame, and a spiral wrap standing on the end plate; and a end plate and a spiral wrap standing on one surface of the end plate. And a rocking scroll having a boss erected on the other surface, and the fixed scroll and the rocking scroll are assembled by engaging wraps with each other. This is a configuration in which a drive device provided on the rotating shaft is fitted.

An Oldham coupling for revolving the orbiting scroll on a circular orbit so that it does not rotate with respect to the fixed scroll is incorporated as a separate ring-shaped component, and is attached to the frame and the end plate of the orbiting scroll. The key is fitted in the formed groove and slid.

On the other hand, a thrust bearing portion is formed on the frame to support the thrust load of the orbiting scroll.

[0005]

However, in the scroll type fluid machine of this structure, especially in the oilless scroll type compressor, the axial load design of the orbiting scroll is important, and the thrust bearing portion is specially designed. Lubrication measures must be taken.

Therefore, conventionally, a thrust bearing portion and a mounting portion of a fixed scroll are integrally formed in a frame in a stepped manner, so that the dimensional difference of the stepped portion is managed with high accuracy, and the fixed scroll and the orbiting scroll are bitten. The mating dimensions and the thrust bearing dimensions were controlled.

However, since the frame is usually made of an iron material, there is a problem that the thrust bearing portion is apt to seize due to the thrust load applied to the orbiting scroll.

Therefore, a method of applying a sliding material to the thrust bearing portion can be considered, but when such a sliding material is applied, the surface accuracy of the thrust surface becomes rough, and conversely, the performance of the scroll fluid machine is deteriorated. Even if the sliding material is uniformly applied with an adhesive, this problem cannot be solved by the intervention of the adhesive, resulting in uneven surface accuracy.

In order to deal with the variation in thrust surface accuracy as described above, a method of interposing a spacer having a dimension corresponding to the variation between the frame and the fixed scroll may be considered, but in this case, the variation dimension Since it is necessary to prepare a wide variety of spacers corresponding to, it is not realistic.

The present invention solves the above problems.
Thrust dimensions can be controlled with high accuracy by a simple configuration,
Moreover, by simplifying the configuration and mounting of the thrust bearing parts,
An object of the present invention is to provide a high-performance scroll fluid machine capable of improving assembly workability. Another object of the present invention is to provide a scroll fluid machine that can cope with variations in the thrust bearing surface without needing to prepare a wide variety of spacers and can promote improvement of the thrust bearing accuracy.

[0011]

According to a first aspect of the present invention, there is provided a scroll compression element and an electric element,
The scroll compression element is fixed to the frame and has a fixed scroll having an end plate and a spiral wrap standing on the end plate, and the end plate and the spiral wrap standing on one surface of the end plate and the other end. In a scroll type fluid machine comprising an oscillating scroll having a boss erected on the surface of an oscillating scroll, and an Oldham coupling revolving the oscillating scroll on a circular orbit so as not to rotate with respect to the fixed scroll. A thrust bearing component for supporting the thrust surface of the end plate of the orbiting scroll is provided on the frame as a separate cap-shaped component.

According to the second aspect of the present invention, the scroll compression element and the electric element are provided, and the scroll compression element is fixed to the frame and has the end plate and the spiral wrap standing on the end plate. A scroll, an orbiting scroll having an end plate and a spiral wrap standing on one surface of the end plate, and a boss standing on the other surface,
In a scroll type fluid machine configured with an Oldham coupling that revolves on a circular orbit so that the orbiting scroll does not rotate with respect to the fixed scroll, while a spacer is provided between the frame and the fixed scroll,
A thrust bearing component for supporting the thrust surface of the end plate of the orbiting scroll is provided as a cap-shaped separate component on the frame.

[0013]

According to the present invention, since the thrust bearing component is a separate component, the thrust dimension of the thrust bearing component itself can be controlled with high accuracy by itself, and as a result, the thrust of the scroll fluid machine can be achieved. The bearing dimensions can be controlled with high accuracy, and the performance of fluid machinery can be improved.

Further, since the thrust bearing component is a separate cap-shaped component, it can be fitted and fitted in the groove formed in the frame with one touch, and no adhesive is required. There is no variation and the thrust dimension can be maintained with high accuracy, and assembly workability can be improved. It should be noted that the positioning can be easily performed with a pin or the like.

According to the second aspect of the present invention, as the thrust bearing parts are made different parts and the variations in the thrust dimensions are reduced, it is sufficient to provide the spacers corresponding to some variations in the thrust dimensions. It is possible to deal with variations in the thrust bearing surface by using some kinds of spacers without preparing various types of spacers, and it is possible to promote the improvement of the thrust bearing accuracy.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a sectional view of an oil-free scroll type air compressor showing an embodiment of the present invention.

Reference numeral 1 is a scroll type air compressor, which is composed of an upper scroll compression element 2 and a lower electric element 3. Scroll compression element 2
Is composed of a frame 5 having a main bearing 4 in the center, a fixed scroll 6 fixed to a motor cover 15 described later through a spacer 45, and an orbiting scroll 7 sandwiched between the fixed scroll and the frame 5. It is configured.

The fixed scroll 6 has a disk-shaped end plate 8, an annular wall 9 projecting from the peripheral edge of one end of the end plate, and a spiral wrap 1 erected on the end plate 8 surrounded by the annular wall.
It is composed of 0 and. The fixed scroll 6 has the annular wall 9 and the wrap 10 protruding downward.

The orbiting scroll 7 has a disk-shaped end plate 11,
A spiral wrap 12 erected on one surface of this end plate
And the boss portion 13 protruding in the center of the other surface of the end plate 11.
It consists of and. The orbiting scroll 7 has the wrap 12 projecting upward.

The fixed scroll 6 and the orbiting scroll 7 are formed such that the wraps 10 and 12 face each other and engage with each other to form a plurality of compression spaces 14. The electric element 3 includes a motor cover 15 fixed to the frame 5 and a stator 16 fixed in the motor cover.
And a rotor 17 arranged inside the stator and a rotary shaft 18 inserted in the center of the rotor. The motor cover 15 has an auxiliary bearing 1 that supports a rotating shaft.
9 is provided.

A ball bearing 24 fitted to the step portion 20 of the rotary shaft 18 is attached to the main bearing 4.

Reference numeral 25 is a drive device for transmitting the rotational force of the electric element 3 to the orbiting scroll 7, and this drive device balances the unbalanced force of the orbiting scroll 7 with a balance weight 26.
And an eccentric bush 28 that inserts into the boss hole of the boss portion 13 of the orbiting scroll to revolve the orbiting scroll 7.
And a pin 29 for positioning the eccentric bush and the balance weight, and a bolt 30 for fixing the eccentric bush 28 to the rotating shaft 18.

The fixed scroll 6 is provided with a suction hole 31 communicating with the outer compression space 14 of the end plate 8 and a discharge hole 32 communicating with the compression space 14 at the center of the end plate 8.

Reference numeral 36 denotes an Oldham coupling that revolves the orbiting scroll 7 on a circular orbit so as not to rotate with respect to the fixed scroll 6.

Reference numeral 33 is a reinforcing rib integrally formed on the rear surface of the end plate 11 of the orbiting scroll 7. The reinforcing rib is formed by continuously forming an annular thrust bearing portion 34 at the center and a key groove forming portion 40 defining a key groove 35 that engages with the key 41 of the Oldham coupling 36 at the end portion.

When the electric element 3 is rotated in the scroll type air compressor constructed as described above, the rotational force is transmitted to the orbiting scroll 7 through the rotary shaft 18.
That is, the orbiting scroll 7 is driven by the eccentric bush 28 of the drive device 25 attached to the rotary shaft 18 inserted in the boss hole of the boss portion 13 of the scroll, and the Oldham coupling 3
6 revolves on a circular orbit with respect to the fixed scroll 6 so as not to rotate. And fixed scroll 6
The orbiting scroll 7 gradually reduces the compression space 14 formed by these scrolls from the outside to the inside, and compresses the air flowing in from the suction hole 31. The compressed air is discharged through the discharge hole 3 of the end plate 8 of the fixed scroll 6.
It is ejected from 2.

The order of assembling the drive device 25 will be described. First, the frame 4 is fixed to the motor cover 15 in which the electric element 3 is incorporated. At this time, a ball bearing 24 is incorporated in the main bearing 4 of the frame 4. In this state, the balance weight 26 is inserted into the rotating shaft 18 so as to contact the inner ring of the ball bearing 24. A pin 29 is set on the balance weight 26 inserted on the rotary shaft. Then, the eccentric bush 28 is inserted into the rotary shaft 18 so as to fit into the pin 29. Finally, the eccentric bush 28 is fixed to the rotary shaft 18 with the bolt 30. At this time, the needle bearing 37 and the seal member 38 are set between the boss portion 13 of the orbiting scroll 7 and the eccentric bush 28. The inner ring of the ball bearing 24 and the balance weight 26 are pressed and fixed to the step portion 20 of the rotary shaft by the tightening force of the bolt 30 that fixes the eccentric bush 28 to the rotary shaft 18. As a result, the drive device 25 is securely fixed by the single bolt 30.

Balance weight 26 and eccentric bush 28
By positioning with the pin 29, the unbalanced force generated by the orbiting of the orbiting scroll 7 during operation is reliably canceled by the balance weight 26.

Further, the drive device 25 is fixed to the rotary shaft 18 with a single bolt 30, so that the work of attaching each component is eliminated and the assembling process can be simplified.

On the other hand, on the upper surface of the frame 5, a thrust cap 42 having a sliding surface coated with or pasted with a sliding material 43 such as a solid lubricating material is fitted. That is, as shown in FIGS. 3 to 5, the thrust cap 42 is formed in a ring shape from a metal or a synthetic resin material, and the sliding material 43 is applied or affixed to the upper surface thereof while the projection 46 is integrally formed on the lower surface. ing. Then, the protrusion 46 is formed in the groove 4 of the frame 5.
It is fixed to the frame 5 by being fitted into the frame 7.

As described above, since the thrust bearing component is composed of the thrust cap 42 attached to the frame 5 as a separate component, the thrust dimension b including the thrust surface precision is accurately finished by the thrust cap 42 alone. It can be processed and managed, and as a result, the thrust bearing dimension a of the scroll fluid machine can be managed with high accuracy, and the performance of the fluid machine can be improved.

Further, since the thrust cap 42 is a separate cap-shaped component, it can be fitted and fitted in the groove 47 formed in the frame 5 with one touch, and no adhesive is required. The thrust bearing dimension a can be maintained with high accuracy without variations in the bearing dimension a, and the assembling workability can be improved.

6 to 10 show another embodiment, and FIGS. 6 to 9 show a fluid machine of a type in which the fixed scroll 6 is fixed directly to the frame 5 without using the spacer 45 in FIG. Therefore, the thrust cap 50 has the upper surface thereof coated with or adhered with the sliding material 51, while the lower surface is integrally formed with the groove 52, and the pin 53 is fitted into both the groove 52 and the groove 47 of the frame 5. By doing so, the frame 5 is fixed.

FIG. 10 shows an example in which the spacer 45 is used. As the variation of the thrust dimension b is reduced by making the thrust cap 50 as a separate component, it is possible to cope with some variations of the thrust dimension b. It suffices to provide several spacers 45, and it is possible to cope with variations in the thrust bearing dimension a by using a few kinds of spacers 45 without preparing a wide variety of spacers, thus improving the thrust bearing accuracy. Can be promoted.

[0036]

As described above, according to the present invention, since the thrust bearing component is a separate component, the thrust dimension of the thrust bearing component itself can be controlled with high accuracy by itself. As a result, the thrust bearing size of the scroll fluid machine can be controlled with high accuracy, and the performance of the fluid machine can be improved.

Further, since the thrust bearing component is a separate cap-shaped component, it can be fitted into the groove formed in the frame by one-touch and mounted, and no adhesive is required, so that the thrust dimension of the conventional type can be obtained. There is no variation and the thrust dimension can be maintained with high accuracy, and assembly workability can be improved. It should be noted that the positioning can be easily performed with a pin or the like.

Further, according to the structure of claim 2, as the variation in the thrust dimension due to the separate use of the thrust bearing component is reduced, it is only necessary to provide the spacer corresponding to some variation in the thrust dimension. It is possible to deal with variations in the thrust bearing surface by using some kinds of spacers without preparing various types of spacers, and it is possible to promote the improvement of the thrust bearing accuracy.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll type air compressor showing an embodiment of the present invention.

FIG. 2 is a sectional view of a thrust bearing portion.

FIG. 3 is a perspective view of a thrust cap.

FIG. 4 is a plan view of a thrust cap.

FIG. 5 is a sectional view of a thrust cap.

FIG. 6 is a sectional view of a thrust bearing portion showing another embodiment.

FIG. 7 is a perspective view of a thrust cap according to another embodiment.

FIG. 8 is a plan view of a thrust cap showing another embodiment.

FIG. 9 is a sectional view of a thrust cap showing another embodiment.

FIG. 10 is a sectional view of a thrust bearing portion showing another embodiment.

[Explanation of Codes] 2 Scroll compression element 3 Electric element 5 Frame 6 Fixed scroll 7 Oscillating scroll 8, 11 End plate 10, 12 Wrap 33 Reinforcing rib 34 Thrust bearing portion 35 Key groove 36 Oldham joint 42 Thrust cap 43 Sliding material 45 Spacer 46 Protrusion 47 Groove

Claims (2)

[Claims] 1. A scroll compression element and an electric element are provided, the scroll compression element fixed to a frame,
A fixed scroll having an end plate and a spiral wrap erected on the end plate, and an end plate, a spiral wrap erected on one surface of the end plate, and a boss erected on the other surface. A scroll type fluid machine comprising an orbiting scroll and an Oldham coupling revolving on a circular orbit so that the orbiting scroll does not rotate with respect to the fixed scroll. A scroll-type oil-free fluid machine characterized in that a thrust bearing component for supporting a surface is provided as a separate cap-shaped component. 2. A scroll compression element and an electric element, the scroll compression element fixed to the frame,
A fixed scroll having an end plate and a spiral wrap erected on the end plate, and an end plate, a spiral wrap erected on one surface of the end plate, and a boss erected on the other surface. In a scroll type fluid machine comprising an orbiting scroll and an Oldham coupling revolving on a circular orbit so that the orbiting scroll does not rotate with respect to the fixed scroll, a spacer is provided between the frame and the fixed scroll. On the other hand, a scroll type oil-free fluid machine characterized in that a thrust bearing component for supporting the thrust surface of the end plate of the orbiting scroll is provided as a cap-shaped separate component on the frame.