JPH08200245A - Scroll type unlubricated fluid machine - Google Patents

Abstract

PURPOSE: To provide a scroll type unlubricated fluid machine wherein thrust dimension can be high accurately controlled by a simple constitution further to simplify constititing and mounting to enable assembly workability to improve. CONSTITUTION: A machine comprises a scroll compression element 2 and an electric motor element 3, and this scroll compression element 2, fixed to a frame 5, has a fixed scroll 6 having an end plate 8 and a spiral lap 10 vertically provided in this end plate 8 and a swivel scroll 7 having an end plate 11, spiral lap 12 vertically provided in one surface of this end plate 11 and a boss part 13 vertically provided in the other surface. In the scroll type fluid machine constituted of an Oldham's coupling 36 rotating this swivel scroll 7 not on its own axis but on a circular track relating to the fixed scroll 6, a dry bearing 62 for supporting a thrust surface of the end plate 11 of the swivel scroll 7 is provided in the frame 5, to engage this dry bearing 62 with the frame 5.

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, conventionally, as shown in FIG. 13, by sticking the sliding material 102 to the thrust bearing portion 100A of the frame 100 with the adhesive 101, seizure of the thrust bearing portion is prevented, and the fixed scroll and the frame 100 are connected. The thrust bearing dimension a was adjusted by interposing the spacer 103 between the two.

Further, without using such a spacer, the groove 106 is formed in the thrust bearing portion 100A of the frame 100 as shown in FIG.
And a metal plate 10 having a groove 107 formed on the lower surface.
In some cases, a sliding film 109 was applied to the upper surface of No. 8 and the metal plate 108 was fixed to the frame 100 by fixing pins 111 that fit into both the grooves 106 and 107. Further, instead of applying the sliding film 109 as shown in FIG. 15, the adhesive 101 is applied to the upper surface of the metal plate 108.
Depending on the case, the sliding material 102 may be attached.

However, in the structure of FIG.
Since the thickness of 01 is not uniform and it is difficult to control the thrust dimension b, the thrust bearing dimension a varies.
Further, in the structure of FIG. 14, it becomes difficult to control the size (thrust size b) of the metal plate 108 coated with the sliding film 109, the number of parts increases, and the assembling workability deteriorates. Further, in the structure of FIG. 15, both the adhesive 101 and the sliding film 109 are present, so both problems occur.

The present invention solves the above problems.
Thrust dimensions can be controlled with high accuracy by a simple configuration,
Moreover, it is an object of the present invention to provide a high-performance scroll-type oil-free type fluid machine that can improve the assembly workability by simplifying the configuration and mounting.

[0012]

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 the boss, and an Oldham coupling revolving the oscillating scroll on a circular orbit without rotating with respect to the fixed scroll. The frame is provided with a dry bearing for supporting the thrust surface of the end plate of the orbiting scroll, and the dry bearing is engaged with the frame.

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 provided upright 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 the orbiting scroll on a circular orbit without rotating with respect to the fixed scroll, the frame includes:
A dry bearing made of a resin material that supports the thrust surface of the end plate of the orbiting scroll is provided, and the dry bearing is engaged with the frame.

According to the third aspect of the present invention, the scroll compression element and the electric element are provided, and the scroll compression element includes the fixed scroll fixed to the frame and the orbiting scroll driven by the electric element. In the scroll fluid machine, the electric element includes a motor cover fixed to a frame, and the scroll compression element includes
The outer cover is provided with a connection port communicating with the discharge hole, and an electric equipment chamber for accommodating electric components such as a condenser is formed at the end of the motor cover opposite to the scroll compression element. .

[0015]

According to the present invention, the structure of claim 1 makes it possible to prevent the seizure due to the thrust load of the orbiting scroll by the dry bearing, and to manage the thrust size with high accuracy only by controlling the size of the dry bearing alone. As a result, the thrust bearing size of the scroll type oilless type fluid machine can be controlled with high accuracy, and the performance can be improved.

In particular, since the dry bearing is engaged with the frame, it can be attached with one touch, and since no adhesive is required, there is no variation in the thrust dimension due to the conventional adhesive and the thrust dimension can be made highly accurate. It can be maintained and assembly workability can be improved. Furthermore, the dry bearing does not move even if a force is applied in the radial direction.

In addition to the above, according to the second aspect of the present invention, it is possible to suppress the variation in the thrust dimension when mass-produced only by controlling the mold of the resin material. Therefore, the thrust bearing size of the scroll type oilless type fluid machine can be managed easily and with higher accuracy.

Further, according to the third aspect of the present invention, the overall size of the scroll type oil-free fluid machine can be reduced, and the motor cover can also serve as the outer cover, so that the number of parts can be reduced as a whole. It is possible to reduce the number of assembly steps and the cost.

[0019]

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 1 of an air compressor C (shown in FIGS. 12 and 13) showing an embodiment of the present invention.

The air compressor 1 is composed of an upper scroll compression element 2 and a lower electric element 3. The scroll compression element 2 has a frame 5 having a main bearing 4 at the center, a fixed scroll 6 fixed to the frame 5 with bolts 51, and an elastic body 52 sandwiched between the fixed scroll 6 and the frame 5. Swing scroll 7
It consists of and.

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 erected on the end plate 8 surrounded by the annular wall 9. It is composed of 10 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,
It is composed of a spiral wrap 12 standing on one surface of the mirror plate 11, and a boss portion 13 protruding in the center of the other surface of the mirror plate 11. The orbiting scroll 7 has the wrap 12 projecting upward.

The fixed scroll 6 and the orbiting scroll 7 are formed so 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 with bolts 53, a stator 16 fixed in the motor cover 15, a rotor 17 arranged inside the stator 16, and a rotor 17 The rotary shaft 18 is attached to the center of the child 17. The motor cover 15 is provided with an auxiliary bearing 19 that supports the rotary shaft 18 via a ball bearing 54.

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. The drive device 25 is a balance weight 26 for balancing the unbalanced force of the orbiting scroll 7 and a boss of the orbiting scroll 7. An eccentric bush 28 that is inserted into the boss hole of the portion 13 and revolves the orbiting scroll 7, and the eccentric bush 28 and the balance weight 2
6, a pin 29 for positioning the eccentric bush 28 and a bolt 30 for fixing the eccentric bush 28 to the rotary shaft 18.

The fixed scroll 6 has a suction hole 31 communicating with the compression space 14 outside the mirror plate 8, and a discharge hole 32 communicating with the compression space 14 at the center of the mirror plate 8.

An Oldham coupling 36 revolves around the circular orbit so that the orbiting scroll 7 does not rotate with respect to the fixed scroll 6.

Reference numeral 33 is a reinforcing rib integrally formed on the back surface of the end plate 11 of the orbiting scroll 7. This reinforcing rib 3
3 is an annular thrust bearing portion 34 formed continuously 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 is continuously formed at the end portion.

When the electric element 3 is rotated in the scroll type air compressor 1 constructed as described above, the rotational force is transmitted to the orbiting scroll 7 via 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 into the boss hole of the boss portion 13 of the scroll so as not to rotate with respect to the fixed scroll 6 by the Oldham coupling 36. Can be revolved in a circular orbit. Then, the fixed scroll 6 and the orbiting scroll 7 gradually reduce the compression space 14 formed by these scrolls from the outside to the inside, and compress the air flowing in from the suction hole 31.
The compressed air is discharged from the discharge hole 32 of the end plate 8 of the fixed scroll 6.

The order of assembling the drive unit 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 18 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 circular groove 61 is formed on its sliding surface, and a dry bearing 62 is fitted in the groove 61. That is, the dry bearing 62 is formed of a synthetic resin material in a ring shape as shown in FIGS. Then, by fitting the groove 5 of the frame 5 from above, the frame 5
It is fixed to.

Since the dry bearing 62 can prevent seizure due to the thrust load of the orbiting scroll 7, the thrust dimension b can be controlled with high accuracy only by controlling the dimension of the dry bearing 62 alone.
As a result, the thrust bearing dimension a of the air compressor 1 can be controlled with high accuracy, and the performance can be improved.

In particular, the dry bearing 62 is the frame 5
Since it fits in the groove 61 of the device, it can be attached with one touch, and since no adhesive is required, there is no variation in the thrust dimension b due to the conventional adhesive, and the thrust dimension b
Can be maintained with high accuracy, and the assembling workability can be improved. Further, since the dry bearing 62 engages in the groove 61, the dry bearing 62 does not move even if a force is applied in the radial direction.

Furthermore, since the dry bearing 62 is formed of a synthetic resin material, it is possible to suppress variations in the thrust dimension b when mass-produced by only controlling the mold of the resin material. Therefore, the thrust bearing dimension a of the air compressor 1 can be managed easily and with higher accuracy.

4 to 10 show another embodiment. In FIG. 4, the groove 61 is formed on the upper surface (sliding surface) of the frame 5.
Instead of this, a circular step portion 64 that is inwardly dropped is formed, and the dry bearing 62 is fitted into the step portion 64 from above and the outer peripheral edge thereof is engaged with the frame 5. Further, in FIG. 5, a circular step portion 66 is formed on the upper surface (sliding surface) of the frame 5 so as to fall outward.
6, a dry bearing 62 is fitted from above and the inner peripheral edge thereof is engaged with the frame 5. In any case, the same effect as described above can be obtained.

In FIG. 6, step portions 67 and 68 are formed on the inner and outer circumferences of the upper surface (sliding surface) of the frame 5, and the cross section of the dry bearing 62 is formed into a cap shape having collars 69 and 69 on the inner and outer circumferences. The step portions 67 and 68 are fitted and engaged from above. In addition, in FIG.
68 is not formed, but a cap-shaped dry bearing 62 is also fitted. In this case, as shown in FIG. 8, inwardly projecting claws 71, 71 are formed at the tips of the collars 69, 69 of the dry bearing 62, and the claws 71 are engaged with the grooves 72, 72 formed in the frame 5. The dry bearing 62 can be fixed more reliably. Further, in FIG. 9, the flange 69 is formed only on the inner circumference of the dry bearing 62, and in FIG. 10, the flange 69 is formed only on the outer circumference. In any of the above cases, the dry bearing 62 can be easily attached with a single touch by simply pushing it against the frame 5 from above, and since the collar 69 engages with the frame 5, the dry bearing 62 does not move. . In particular, FIG. 9 and FIG.
When 0, no groove or step is formed in the frame 5, so
Processing workability is also improved.

The fixed scroll 6 of the scroll compression element 2 located at the upper end of the air compressor 1 constructed as described above is covered with a cap-shaped exterior cover 74, and the exterior cover 74 is fixed to the frame 15 with screws 75. A connection port 76 for connecting to other equipment is attached to the exterior cover 74, and the connection port 76 is connected to the discharge hole 32 of the air compressor 1 by a pipe 77.

A through hole 78 is formed in the lower surface of the motor cover 15 on the side opposite to the scroll compression element 2, and a terminal 79 is attached to the motor cover 15 so as to seal the through hole 78. There is. The terminal 79 is electrically connected to the stator 16 of the electric element 3 of the air compressor 1. An electric equipment box 81 is attached to the motor cover 15 by bolts 82 around the lower end of the motor cover 15, and the terminals 79 face an electric equipment chamber 83 in the electric equipment box 81.

Further, a condenser 84 for starting and operating the electric element 3 and a starting relay 86 are housed in the electric equipment chamber 83, and a power switch 87 is attached to the side surface of the electric equipment box 81 so as to be external. And is electrically connected to the terminal 79. Further, a base leg 89 having legs 88 ... Is attached to the lower surface of the electrical equipment box 81 by bolts 91. A power cord 92 is accommodated in the base leg 89, and a plug 93 thereof is attached to the base leg 89. It is said that it can be pulled out from the outside.

The air compressor C of the present invention has such a structure that the overall size can be reduced, and
Since the motor cover 15 can also serve as the outer skin,
As a result, the number of parts can be reduced as a whole, and the number of assembling steps and the cost can be reduced.

[0045]

As described above, according to the present invention, claim 1
With this configuration, the dry bearing can prevent seizure due to the thrust load of the orbiting scroll, and the thrust dimension can be controlled with high accuracy only by controlling the dimensions of the dry bearing alone, resulting in a scroll type oil-free type. The thrust bearing size of the fluid machine can be controlled with high accuracy, and the performance can be improved.

In particular, since the dry bearing is engaged with the frame, it can be attached with one touch, and since no adhesive is required, there is no variation in the thrust dimension due to the conventional adhesive, and the thrust dimension is highly accurate. It can be maintained and assembly workability can be improved. Furthermore, the dry bearing does not move even if a force is applied in the radial direction.

In addition to the above, according to the second aspect of the present invention, it is possible to suppress variations in thrust dimensions when mass-produced only by controlling the mold of the resin material. Therefore, the thrust bearing size of the scroll type oilless type fluid machine can be managed easily and with higher accuracy.

Further, according to the third aspect of the present invention, the size of the scroll type oil-free fluid machine as a whole can be reduced, and the motor cover can also serve as the outer cover, so that the number of parts can be reduced as a whole. It is possible to reduce the number of assembly steps and the cost.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of the upper part of the frame.

FIG. 3 is a perspective view of a frame and a dry bearing.

FIG. 4 is a sectional view of an upper portion of a frame showing another embodiment.

FIG. 5 is a cross-sectional view of an upper portion of a frame showing still another embodiment.

FIG. 6 is a cross-sectional view of an upper portion of a frame showing still another embodiment.

FIG. 7 is a cross-sectional view of an upper portion of a frame showing still another embodiment.

FIG. 8 is an enlarged view of a portion surrounded by a circle in FIG.

FIG. 9 is a sectional view of an upper portion of a frame showing still another embodiment.

FIG. 10 is a sectional view of an upper portion of a frame showing still another embodiment.

FIG. 11 is a side view of the air compression device.

FIG. 12 is a cross-sectional view of an air compression device.

FIG. 13 is a cross-sectional view of an upper portion of a frame of a conventional scroll type oil-free fluid machine.

FIG. 14 is a cross-sectional view of an upper portion of a frame of another conventional scroll-type oilless fluid machine.

FIG. 15 is a sectional view of an upper portion of a frame of yet another conventional scroll-type oil-free fluid machine.

[Explanation of Codes] 1 Air compressor 2 Scroll compression element 3 Electric element 5 Frame 6 Fixed scroll 7 Swing scroll 8, 11 End plate 10, 12 Lap 15 Motor cover 33 Reinforcing rib 34 Thrust bearing part 35 Key groove 36 Oldham coupling 61 Groove 62 Dry bearing 74 Exterior cover 81 Electrical equipment box 83 Electrical equipment room 84 Condenser C Air compressor

Claims (3)

[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. In a scroll type fluid machine constituted by an orbiting scroll and an Oldham coupling revolving the orbiting scroll on a circular orbit without rotating with respect to the fixed scroll, a frame of the end plate of the orbiting scroll is provided in the frame. A scroll type oil-free fluid machine characterized in that a dry bearing for supporting a thrust surface is provided and the dry bearing is engaged with the frame. 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 constituted by an orbiting scroll and an Oldham coupling that revolves on a circular orbit without rotating the orbiting scroll with respect to the fixed scroll, a frame of the orbiting scroll end plate is provided in the frame. A scroll-type oil-free fluid machine characterized in that a dry bearing made of a resin material that supports a thrust surface is provided, and the dry bearing is engaged with the frame. 3. A scroll compression element and an electric element, the scroll compression element comprising a fixed scroll fixed to a frame and an orbiting scroll driven by the electric element, wherein the electric element is the frame. In a scroll type fluid machine comprising a motor cover fixed to the scroll compression element, the scroll compression element is covered with an exterior cover having a connection port communicating with the discharge hole, and the scroll compression element is provided on the opposite side of the scroll compression element. At the end of the motor cover,
A scroll-type oil-free fluid machine characterized in that an electric equipment chamber for accommodating electric components such as a condenser is formed.