JP2000064969A - Oilless scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oilless scroll fluid machine capable of improving a heat radiation characteristic of an electric element and enhancing an assembling productivity. SOLUTION: The fluid machine has a scroll compression element 2 constituted by a fixed scroll 6 having a mirror plate 8 and a spiral lap 10 vertically provided on the mirror plate 8 and fixed to a housing 5 and a pivotable scroll having a mirror plate 11 and a spiral lap 12 vertically provided on the mirror plate 11 and engaged with the lap 10 of the fixed scroll 6; an electric element 3 being provided with a rotating shaft 18 driving the pivotable scroll 7; and Oldham's coupling 36 for revolving the pivotable scroll 7 in a circular orbital without autorotating it against the fixed scroll 6. The rotating shaft 18 is pivotally supported to a main bearing 4 of the housing 5 and a shaft seal 56 closely adhered to the rotating shaft 18 is provided on the main bearing 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional oilless scroll fluid machine, particularly a compressor, includes a scroll compression element and an electric element as disclosed in Japanese Patent Application Laid-Open No. 62-282186, for example. Is a fixed scroll having a housing having a main bearing in the center, a head plate fixed to the housing, and a spiral wrap provided upright on the head plate, and a scroll provided upright on one surface of the head plate and one of the head plates. The fixed scroll and the oscillating scroll are assembled by engaging the wraps with each other, and the boss of the oscillating scroll has a boss formed on the other surface. This is a configuration in which a driving device provided on the rotating shaft of the electric element is fitted.

An Oldham coupling for revolving the orbiting scroll on a circular orbit so as not to rotate with respect to the fixed scroll is incorporated as a separate ring-shaped part, and is provided on the housing and the end plate of the orbiting scroll. In this configuration, a key is fitted into each formed groove and slid.

Further, the upper and lower portions of the rotating shaft of the electric element are supported by a main bearing and an auxiliary bearing formed on a housing and a case via bearings in order to reduce the rotational friction. This case houses the electric element and is mounted on the surface of the housing opposite to the scroll compression element.

[0005]

In this conventional oilless scroll fluid machine, no seal is formed between the rotary shaft and the main bearing of the housing, so that the orbiting scroll is supported from the housing side. The back pressure chamber (the space between the orbiting scroll and the housing) and the inside of the case have an intermediate pressure. For this reason, conventionally, the contact surface between the case and the housing is strictly sealed, which has led to a decrease in productivity.

In addition, since the electric element and the bearing sliding portion of the rotating shaft are sealed in the case, the heat generated from these parts is transmitted to the housing and the case itself and dissipated from their outer surfaces. No heat radiation performance had to be reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and can improve the heat radiation characteristics of an electric element and the like, and can improve the assembling productivity in an oilless scroll fluid machine. Is provided.

[0008]

That is, an oilless scroll fluid machine according to the present invention has a head plate, a spiral wrap erected on the head plate, a fixed scroll fixed to a housing, and a head plate. A scroll compression element composed of an orbiting scroll having a fixed scroll wrap and a spiral wrap that mesh with each other and erected on the end plate, and an electric element having a rotating shaft that drives the orbiting scroll, An Oldham coupling for revolving the orbiting scroll on a circular orbit without rotating with respect to the fixed scroll, wherein the rotating shaft is supported by the main bearing of the housing and is connected to the main bearing. Is provided with a shaft seal in close contact with the rotating shaft.

According to the present invention, the main bearing of the housing that supports the rotating shaft is provided with the shaft seal that is in close contact with the rotating shaft. Therefore, the space around the back pressure chamber and the electric element between the orbiting scroll and the housing is reduced. , Is isolated by the shaft seal, and the pressure of the back pressure chamber is maintained by the shaft seal.

[0010] This makes it possible to communicate the space around the electric element to the outside and make the air flow in contact with the electric element, the bearing sliding portion of the rotary shaft, or the shaft seal to cause convection. The heat dissipation characteristics can be remarkably improved by smoothly dispersing.

An oil-free scroll fluid machine according to a second aspect of the present invention is provided with a case mounted on the housing and accommodating an electric element. The case is provided with an auxiliary bearing for supporting a rotary shaft. The auxiliary bearing is provided with a communication portion communicating with the outside of the case.

According to the second aspect of the present invention, in addition to the above, the case is provided with an auxiliary bearing which is attached to the housing for accommodating the electric element and supports the rotary shaft. Since the communicating portion for communicating is formed, convection of air can be performed from the communicating portion of the case to the inside and outside of the case. In particular, since the communication part is formed in the auxiliary bearing, heat radiation from the auxiliary bearing sliding part can be promoted, and a tool can be inserted from the communication part to prevent rotation of the rotary shaft. In addition, it is possible to improve the workability of assembling parts mounted on the rotating shaft.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an oilless scroll type air compressor 1 as an embodiment of an oilless scroll fluid machine of the present invention. Scroll type air compressor 1
Are the upper scroll compression element 2 and the lower electric element 3
It is composed of The scroll compression element 2 includes a housing 5 having a main bearing 4 at the center, a fixed scroll 6 fixed to the upper surface of the housing 5 by bolts 51, and an elastic body 52 between the fixed scroll 6 and the housing 5.
And an orbiting scroll 7 sandwiched therebetween.

The fixed scroll 6 has a disk-shaped end plate 8, an annular wall 9 projecting from one peripheral edge of the end plate 8, and a spiral-shaped upright standing on the end plate 8 surrounded by the annular wall 9. And a wrap 10. And fixed scroll 6
Makes the projecting direction of the annular wall 9 and the wrap 10 downward.

The orbiting scroll 7 has a disk-shaped end plate 11,
The end plate 11 includes a spiral wrap 12 erected on one surface of the end plate 11 and a boss 13 protruding from the center of the other surface of the end plate 11. The orbiting scroll 7 has the wrap 12 projecting upward, and a thrust washer 57 is interposed between the rear surface (lower surface) of the orbiting scroll 7 and the upper surface of the housing 5. The space below the orbiting scroll 7, that is, the space between the back surface of the orbiting scroll 7 and the housing 5 is the back pressure chamber G1.

The fixed scroll 6 and the orbiting scroll 7 are engaged with each other so that the wraps 10 and 12 face each other to form a plurality of compression spaces 14 therein. A case 15 is attached to the lower surface of the housing 5 with bolts 53.
Is attached, and the electric element 3 is stored in the case 15. The electric element 3 is located within the case 15 and is fixed to the lower surface of the housing 5 with bolts 26, a rotor 17 disposed inside the stator 16, and a Rotary shaft 1 inserted in the center
8.

A rotating shaft 1 is provided at the center of the lower surface of the case 15.
An auxiliary bearing 19 is provided to support the lower end of 8 via a bearing (hereinafter referred to as a ball bearing) 54. A circular communication hole (communication portion) 22 is formed in the center of the lower surface of the case 15 inside the auxiliary bearing 19, and a space G 2 in the case 15 in the communication hole 22 is formed in the case 15.
The lower end surface 18A of the rotating shaft 18 is in communication with the outside.
Correspond to the inside of the communication hole 22, and a groove for a driver (not shown) is formed.

The main bearing 4 has a bearing (hereinafter referred to as a ball bearing) 24 fitted to the step portion 20 of the rotating shaft 18.
Is attached. The bearing 24 is located below the flange 5A formed substantially at the center of the main bearing 4 of the housing 5 in the vertical direction. A washer 55 is provided between the upper surface of the bearing 24 and the flange 5A. Has been inserted.

A shaft seal 5 is provided on the upper surface of the flange 5A.
6 is attached. The shaft seal 56 is an elastic member made of Teflon or the like, has an annular shape, and is rotated by the pressure of the back pressure chamber G1 as described later.
Is in close contact with the peripheral surface of. Thereby, the back pressure chamber G
1 and the space G2 in the case 15 are separated by the shaft seal 56 as a boundary.

Reference numeral 25 denotes a driving device for transmitting the rotational force of the electric element 3 to the orbiting scroll 7. The driving device 25 is inserted into the boss hole of the boss portion 13 of the orbiting scroll 7 to revolve the orbiting scroll 7. Bush 28 to be made and bush 28
And a bolt 30 fixing the eccentric portion 29 to the eccentric portion 29 at the upper end of the rotating shaft 18. The bolt 30 is screwed into the upper end surface of the eccentric portion 29 of the rotating shaft 18 from above.

The fixed scroll 6 has a suction port 31 communicating with the compression space 14 outside the end plate 8, and a discharge port 32 communicating with the compression space 14 at the center of the end plate 8.
An Oldham coupling 36 revolves on a circular orbit so that the orbiting scroll 7 does not rotate with respect to the fixed scroll 6.

In this case, a reinforcing rib (not shown) is integrally formed on the back surface of the end plate 11 of the orbiting scroll 7, and a groove 58 is formed on the upper surface of the housing 5.
A pair of keys 41, 41 at opposite positions of the Oldham coupling 36 engage with the grooves 58, and another pair of keys (not shown) facing at a position shifted by 90 degrees reinforce the orbiting scroll 7. The orbiting scroll 7 revolves by engaging with the rib.

When the electric element 3 is rotated in the scroll-type air compressor 1 configured as described above, the rotational force is transmitted to the orbiting scroll 7 via the rotating shaft 18. That is, the orbiting scroll 7 is driven by the bush 28 of the driving device 25 attached to the rotating shaft 18 inserted into the boss hole of the boss portion 13 of the scroll, and is not rotated by the Oldham coupling 36 with respect to the fixed scroll 6. Revolved on a circular orbit.

The fixed scroll 6 and the orbiting scroll 7 are formed by a compression space 14 formed by these scrolls.
Is gradually reduced from the outside to the inside, and the suction port 31 is
Compresses the air that has flowed in. The compressed air is discharged from the discharge port 32 of the end plate 8 of the fixed scroll 6.

At this time, the compression chamber 14 for providing an intermediate pressure and the back pressure chamber G1 communicate with each other via the peripheral edge of the end plate 11 of the orbiting scroll 7. As a result, the pressure in the back pressure chamber G1 becomes an intermediate pressure, and the force with which the orbiting scroll 7 is pressed against the housing 5 is reduced. Since the back pressure chamber G1 is separated from the space G2 in the case 15 by the shaft seal 56 as described above, the intermediate pressure in the back pressure chamber G1 is maintained by the shaft seal 56.

On the other hand, the space G2 in the case 15 around the electric element 3 communicates with the outside of the case 15 through the communication hole 22 (FIG. 2), and the air inside and outside the case 15 is convected through the communication hole 22. I do. The convective air is supplied to the shaft seal 5.
6 and the bearings 24, the rotor 17, the rotating shaft 18, and the stator 16, and flows through the inside and outside of the case 15, and the heat generated from these is radiated out of the case 15 by convective air (outside air). Is done. In particular, since the circulating air is collected at the bearing 54 and passes through, the heat radiation of the bearing 54 is improved.

The heat generated from these heat generating parts is radiated outside through the housing 5 and the case 15 itself in addition to the convection of the air.

Next, the procedure for assembling the scroll-type air compressor 1 will be described. First, the stator 16 of the electric element 3 is fixed to the housing 5 with bolts 26. At this time, the ball bearing 2 is attached to the main bearing 4 of the housing 5.
4 and a shaft seal 56 are incorporated, and the step portion 20 of the rotating shaft 18 is inserted so as to contact them.

Next, the case 15 is fixed to the housing 5 with bolts 53, and the electric element 3 is housed in the case 15. At this time, the ball bearing 54 is attached to the auxiliary bearing 19.
The lower end of the rotating shaft 18 is inserted so as to contact the ball bearing 24. The lower end surface 18A is located in the communication hole 22.

Next, the bush 28 is put on the eccentric portion 29 at the upper end of the rotating shaft 18 and fixed to the rotating shaft 18 with bolts 30. At this time, as shown in FIG. D) is inserted into the communication hole 22 and is engaged with the groove on the lower end surface 18A of the rotating shaft 18. As a result, the rotation of the rotating shaft tool D is prevented, so that the rotating shaft 18 cannot be rotated. With the rotation of the rotating shaft 18 blocked in this way, a bushing fastener (e.g., a spanner)
S is fitted to the bolt 30 and rotated to tighten the bolt 30.

Here, since the rotary shaft tool D could not be used conventionally, the rotary shaft 18 is connected to the bush fastener S.
It was easily rotated by. Therefore, in the related art, the bush fastener S is vigorously turned to vigorously use the inertia of the rotary shaft 18 for tightening. However, if the rotation of the rotary shaft 18 is prevented by the rotary shaft tool D as described above, 28 is extremely easy and reliable.

After the bush 28 is attached to the rotating shaft 18 and the bush fastener S is removed, the orbiting scroll 7 is put on the bush 28 and the bush 28 is inserted into the boss portion 13 at this time. A needle bearing 37 and a seal member 38 are set between the boss 13 and the bush 28. The Oldham coupling 36 is set on the upper surface of the housing 5 before covering the orbiting scroll 7.

After the swinging scroll 7 is provided on the housing 5 as described above, the fixed scroll 6 is moved to the swinging scroll 7.
Then, the wraps 10 and 12 are engaged with each other, and the fixed scroll 6 is temporarily fixed to the housing 5 with bolts 51. Next, the rotating shaft 18 is rotated by rotating the rotating shaft tool D.

Here, when the positional relationship between the orbiting scroll 7 and the fixed scroll 6 is deviated, the rotation shaft 18
Wrap 1 due to the revolution of the orbiting scroll 7 due to the rotation of
The fixed scroll 6 moves when 0 and 12 hit each other. Then, the revolution of the orbiting scroll 7 is stabilized in a state where the two scrolls 6 and 7 have a predetermined positional relationship, and the bolt 51 is tightened at this position. Thereby, the positioning of the fixed scroll 6 can be performed extremely easily without driving the electric element 3.

[0035]

As described above in detail, according to the present invention, the main bearing of the housing that supports the rotating shaft is provided with the shaft seal that is in close contact with the rotating shaft, so that the back pressure chamber between the orbiting scroll and the housing is provided. The space around the motor element is isolated by a shaft seal, and the pressure in the back pressure chamber is maintained by the shaft seal.

[0036] This allows the space around the electric element to communicate with the outside, and allows external air to come into contact with the electric element, the bearing sliding portion of the rotating shaft, or the shaft seal to cause convection, and to generate heat generated therefrom. The heat dissipation characteristics can be remarkably improved by smoothly dispersing.

According to the second aspect of the present invention, in addition to the above, the auxiliary bearing of the case provided with the auxiliary bearing for housing the electric element and supporting the rotating shaft is provided between Since the communicating portion for communicating is formed, convection of air can be performed from the communicating portion of the case to the inside and outside of the case. In particular, since the communication part is formed in the auxiliary bearing, heat radiation from the auxiliary bearing sliding part can be promoted, and a tool can be inserted from the communication part to prevent rotation of the rotary shaft. In addition, it is possible to improve the workability of assembling parts mounted on the rotating shaft.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the scroll-type air compressor of FIG. 1 from which an electric element is omitted.

FIG. 3 is a diagram illustrating an operation of attaching a bush to a rotating shaft.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Scroll type air compressor (oilless scroll fluid machine) 2 Scroll compression element 3 Electric element 4 Main bearing 5 Housing 6 Fixed scroll 7 Oscillating scroll 8, 11 End plate 10, 12 Wrap 15 Case 18 Rotary shaft 19 Auxiliary bearing 22 Communication hole (communication part) 24, 54 Ball bearing 28 Bush 30 Bolt 56 Shaft seal G1 Back pressure chamber G2 Space

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takayuki Endo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (Reference) 3H039 AA03 AA10 AA12 BB08 BB12 CC03 CC08 CC16 CC23 CC26 CC31 CC32 CC33

Claims (2)

[Claims] 1. A fixed scroll fixed to a housing and having a head plate and a spiral wrap provided upright on the head plate, and a spiral engaged with the wrap of the fixed scroll provided upright on the head plate and the head plate. A scroll compression element composed of an orbiting scroll having an annular wrap, an electric element having a rotating shaft for driving the orbiting scroll, and a circle without rotating the orbiting scroll with respect to the fixed scroll. An oilless scroll fluid machine having an Oldham coupling for revolving on a track, wherein the rotating shaft is supported by a main bearing of the housing, and the main bearing has a shaft seal that is in close contact with the rotating shaft. An oil-free scroll fluid machine characterized by having: 2. A case attached to the housing and accommodating the electric element, the case having an auxiliary bearing for supporting the rotating shaft, and the auxiliary bearing having a communication portion communicating with the outside of the case. The oil-free scroll fluid machine according to claim 1, wherein a scroll fluid machine is provided.