JPH0719185A - Scroll type air compressor - Google Patents

Abstract

PURPOSE:To secure the large area of a thrust face by respectively forming the thrust face for receiving the thrust load of an oscillating scroll, and a release groove for releasing the protruding part of an Oldham's ring on a plate disposed between the oscillating scroll and the upper face of a frame. CONSTITUTION:A scroll compression element 2 is provided with a fixed scroll 6 fixed to a frame 5 having a bearing at the center, an oscillating scroll 7 connected to a motor-driven element 3, and an Oldham's ring 21 for turning the oscillating scroll 7 without autorotation relative to the fixed scroll 6. In this case, a plate 23 is disposed between the oscillating scroll 7 and the upper face 5a of the frame 5. A thrust face 23a for receiving the thrust load of the oscillating scroll 7, and a release groove 23b for releasing the protruding part 21a of the Oldham's ring 21 are then formed on the plate 23. The large area of the thrust face 23a is thereby secured, and the oscillating motion of the oscillating scroll 7 is brought close to plane motion to the maximum in the oil-free state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type air compressor 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 compressor is constructed, for example, as disclosed in Japanese Patent Laid-Open No. 62-28186. Here, in particular, the oil-free scroll-type air compressor includes a scroll compression element and an electric element,
The scroll compression element includes a frame having a bearing in the center, a fixed scroll having a mirror plate fixed to the frame and a spiral wrap standing on the mirror plate, and a mirror plate and one surface of the mirror plate. And a swing scroll having a boss erected on the other surface. The fixed scroll and the swing scroll are assembled by engaging the wraps with each other. A drive device provided on the rotary shaft of the electric element is fitted to the boss, and on the upper surface of the frame,
A thrust surface of the orbiting scroll that receives the thrust load, a housing groove of the Oldham ring, and a mounting surface of the fixed scroll are integrally formed.

In the scroll type air compressor of this structure,
In the compression process, the orbiting scroll receives a thrust force in the direction away from the fixed scroll, and the overpressure moment acts on the orbiting scroll due to the pressure action in the compression chamber, so the thrust surface is integrated with the upper surface of the frame that is the back of the orbiting scroll. Is forming.

[0004]

However, according to the above structure, in order to integrally form the thrust surface for receiving the thrust load of the orbiting scroll on the upper surface of the frame, the essential components of the compressor such as the Oldham ring and the balancer are formed. There is a problem that it is difficult to take a large thrust surface from the viewpoint of securing the installation space, and it is impossible to completely prevent the orbiting scroll from overturning in a non-lubricated state.

Further, there has been a problem that the Oldham ring is vibrated due to the pressure change in the compression chamber during the compression process, which causes noise.

The present invention has been made in view of the above problems, and it is possible to secure a large area of the thrust surface and maximize the swinging motion of the orbiting scroll in a non-lubricated state to be close to the plane motion. It is an object of the present invention to provide a high-performance scroll air compressor that can completely prevent the orbiting scroll from capsizing and prevent the Oldham ring from pulsating and generate less noise.

[0007]

According to the present invention, there is provided a scroll compression element and an electric element, and the scroll compression element has a frame having a bearing at its center, a fixed scroll fixed to the frame, and the electric element. In a scroll type air compressor including an orbiting scroll connected to the orbiting scroll, the Oldham ring rotating the orbiting scroll so as not to rotate with respect to the fixed scroll, between an upper surface of the frame and the orbiting scroll. A plate having a thrust surface that receives the thrust load of the orbiting scroll and a relief groove that allows the convex portion of the Oldham ring to escape is interposed.

[0008]

The present invention is constructed as described above,
A large thrust surface can be secured simply by forming a large plate, the thrust load of the orbiting scroll can be received on a large surface, and the orbiting motion of the orbiting scroll can be made almost planar, and there is no lubrication. Can surely prevent the orbiting scroll from overturning.

Further, since the plate is provided with a relief groove for escaping the convex portion of the Oldham ring, the Oldham ring can be confined to the lower side of the plate, and the high-performance scroll with little noise by preventing the Oldham ring from pulsating. Type air compressor can be provided.

Further, since the end plate of the orbiting scroll can be sandwiched by the two surfaces of the fixed scroll and the orbiting scroll, the oscillating movement surface of the orbiting scroll can be limited, so that the orbiting scroll can be moved in the thrust direction. The displacement can be reduced, the overturning moment can be reduced, the leakage of the compressed fluid from the compression chamber can be reduced, and the performance of the compressor can be improved.

[0011]

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

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 the frame, and an orbiting scroll 7 sandwiched between the fixed scroll and the frame.

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 includes 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 has a motor cover 15 fixed to the frame 5, 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 is provided with an auxiliary bearing 19 that supports the rotating shaft.

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 unit for transmitting the rotational force of the electric element 3 to the orbiting scroll 7, and this drive unit 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 in the annular wall 9 and a discharge hole 32 communicating with the compression space 14 in the center of the end plate 8. A needle bearing 33 and a seal member 34 are provided between the boss portion 13 of the orbiting scroll 7 and the eccentric bush 28.

Reference numeral 21 is an Oldham ring for rotating the orbiting scroll 7 with respect to the fixed scroll 6 so as not to rotate on its own axis. On the upper surface 5a of the frame 5, a surface 5b in contact with a plate 23 described later and an Oldham ring 2
One accommodation groove 5c is formed. Reference numeral 23 denotes a plate which is interposed between the upper surface 5a of the frame 5 and a spacer 22 which will be described later, and which receives the thrust load of the orbiting scroll 7, and the thrust surface 23a and the Oldham ring 2
An escape groove 23b is formed to allow the first convex portion 21a to escape. A donut-shaped spacer 22 is provided between the plate 23 and the lower surface of the fixed scroll 6 and adjusts the distance between the scrolls 6 and 7 in the thrust direction.

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 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 in the boss portion 13 of the scroll, and the Oldham ring 21 prevents the orbiting scroll 7 from rotating about the fixed scroll 6. Can be revolved over. 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 scroll type air compressor of the present invention receives the thrust load of the orbiting scroll 7 between the upper surface 5a of the frame 5 and the spacer 22, and at the same time, the thrust surface 23a and the convex portion of the Oldham ring 21. Since the plate 23 having the escape groove 23b for escaping 21a is interposed, it is possible to secure a large thrust surface only by forming the plate 23 large, and the thrust load of the orbiting scroll 7 is received on the large surface and the orbiting scroll 7 is swung. Scroll 7
The oscillating movement of the oscillating scroll 7 can be almost a plane movement, and the overturning of the oscillating scroll 7 can be reliably prevented in a non-lubricated state.

Further, the Oldham ring 2 is attached to the plate 23.
Since the relief groove 23b for releasing the convex portion 21a of No. 1 is provided, the Oldham ring 21 can be confined to the lower side of the plate 23, and the high-performance scroll-type air compressor that prevents jerk of the Oldham ring 21 and has less noise. Can be provided.

Further, since the end plate 11 of the orbiting scroll 7 can be sandwiched by the two surfaces of the fixed scroll 6 and the orbiting scroll 7, the orbiting surface of the orbiting scroll 7 can be limited, so that the orbiting scroll 7 can be limited. The displacement of 7 in the thrust direction can be reduced, the overturning moment can be reduced, the leakage of the compressed fluid from the compression chamber 14 can be reduced, and the performance of the compressor can be improved.
In addition, the upper surface 5a of the frame 5 and the fixed scroll 6
Since a donut-shaped spacer 22 for adjusting the thrust-direction spacing between the scrolls 6 and 7 is provided between the lower surface of the and the scroll 6, the spacer 22 can be easily measured as a single component in the thrust direction. it can. Moreover, since the spacer 22 has the function of adjusting the clearance, the entire upper surface 5a of the frame 5 can be made flat, and the mounting surface with high accuracy of surface roughness, flatness, and flatness can be easily formed. Can be formed. Therefore, the assembly accuracy can be improved.

[0025]

As described above, according to the present invention, it is possible to secure a large thrust surface simply by forming a large plate, and the thrust load of the orbiting scroll is received by the large surface, and the orbiting scroll is shaken. The dynamic motion can be almost a planar motion, and the overturning of the orbiting scroll can be reliably prevented in a non-lubricated state.

Further, since the plate is provided with a relief groove for escaping the convex portion of the Oldham ring, the Oldham ring can be confined to the lower side of the plate, and the high-performance scroll with little noise by preventing the Oldham ring from vibrating. Type air compressor can be provided.

Furthermore, since the end plate of the orbiting scroll can be sandwiched by the two surfaces of the fixed scroll and the orbiting scroll to limit the oscillating movement surface of the orbiting scroll, the orbiting scroll is limited in the thrust direction. The displacement can be reduced, the overturning moment can be reduced, the leakage of the compressed fluid from the compression chamber can be reduced, and the performance of the compressor can be improved.

[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 an exploded perspective view of the thrust component of the present invention.

[Explanation of symbols]

 2 scroll compression element 3 electric element 4 main bearing 5 frame 5a upper surface 5b surface 5c storage groove 6 fixed scroll 7 oscillating scroll 8, 11 end plate 10, 12 lap 21 Oldham ring 22 spacer 23 plate 23a thrust surface 23b escape groove 25 drive device

Claims (1)

[Claims] 1. A frame comprising a scroll compression element and an electric element, the scroll compression element having a center bearing, a fixed scroll fixed to the frame,
A scroll-type air compressor including an orbiting scroll connected to the electric element and an Oldham ring for orbiting the orbiting scroll so as not to rotate with respect to the fixed scroll. A scroll type air compressor characterized in that a plate having a thrust surface for receiving the thrust load of the orbiting scroll and a relief groove for escaping the convex portion of the Oldham ring is interposed between the and.