JPH0932744A - Tip clearance adjusting method of scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the measurement work when a shim which adjusts tip clearance between a fixed scroll and a turning scroll is selected and reduce error in the measurement. SOLUTION: One face 5B of an outer peripheral flange 5A of a frame 5 is used as a reference plane, and the distance B between the reference plane 5B and an end face 5D of a support section 5C of the frame 5 and the distance A between the reference plane 5B and an end face 25 of an end plate 21 of a turning scroll 2 which is assembled on the frame 5 are measured. A shim which adjusts tip clearance between a fixed scroll 1 and the turning scroll 2 in accordance with a difference between the distance A and B is selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip clearance adjusting method for a scroll type fluid machine used as a compressor or an expander.

[0002]

2. Description of the Related Art An example of a conventional scroll compressor is shown in FIG.
Is shown in In FIG. 5, reference numeral 4 denotes a closed container, which includes a cup-shaped right housing 49, a frame 5, and a cup-shaped left housing 43, which are fastened to each other by bolts 56. An electric motor M is provided inside the right housing 49, and a scroll compression mechanism C is provided inside the left housing 43.

The electric motor M and the compression mechanism C are interlockingly connected to each other via a rotary shaft 3. Rotating shaft 3
The right end of the bearing is supported by the right housing 49 via a bearing 51, and the left end thereof is supported by the frame 5 via a bearing 52.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotary shaft 3,
The stator Mb is fixed by being pressed into the right housing 49.

The scroll type compression mechanism C comprises a fixed scroll 1, an orbiting scroll 2, a rotation preventing mechanism 6 such as an Oldham link for preventing the orbiting scroll 2 from rotating.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11. The outer peripheral surface of the end plate 11 is brought into close contact with the inner peripheral surface of the left housing 43 to bring the end plate 11 into contact. A discharge chamber 46 is formed on the left side of the
47 is limited.

A discharge port 13 is formed at the center of the end plate 11, and the discharge port 13 is opened and closed by a discharge valve 17. Then, the fixed scroll 1 is fixed to the left housing 43 by screwing a bolt 57 into the protrusion 14 provided upright on the outer surface of the end plate 11.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 which is erected on the inner surface of the end plate 21, and a drive bush 32 is provided in an orbiting bearing inside a boss 23 which is erected on the outer surface of the end plate 21.
It is rotatably fitted through 34. An eccentric drive pin 31 eccentrically provided at the left end of the rotary shaft 3 is slidably fitted in a slide groove 33 formed in the drive bush 32.

A rotation preventing mechanism 6 is interposed between the end plate 21 and the frame 5, and the outer surface of the end plate 21 is a thrust bearing 53.
It is in sliding contact with the left end surface of the frame 5 via.

A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and meshing them by shifting the angle by 180 degrees.

When the electric motor M is driven, the rotary shaft 3, the eccentric drive pin 31, the drive bush 32, and the slewing bearing 3 are driven.
4, the orbiting scroll 2 is driven through the orbiting drive mechanism including the boss 23, etc.
While being prevented from rotating by itself, it makes a revolution revolving motion on a circular orbit of revolution revolution radius.

Then, the gas enters the low pressure chamber 48 through the suction port 44, and this gas is passed through the passage provided on the outer periphery of the stator Mb.
After cooling the electric motor M in the process of passing through the gap 58 between the stator 58 and the stator Ma and the rotor Ma, the electric motor M is sucked into the closed space 24 through the passage 54 and the suction chamber 47 provided in the frame 5.

As the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and passes through the discharge port 13 from the central portion.
The discharge valve 17 is pushed open to be discharged into the discharge chamber 46, and then discharged to the outside through the discharge port 45. Reference numeral 18 is a valve retainer for limiting the rise of the discharge valve 17.

When assembling the conventional scroll type fluid machine, as shown in FIG. 4, after the fixed scroll 1 is assembled in the left housing 43 and these are fastened by the bolts 57, the fixed scroll 1 and the front end surface of the spiral wrap 12 are joined together. The distance C from the right end surface of the left housing 43 is measured. On the other hand, the bearing 52, the thrust bearing 53, the orbiting scroll 2, the orbiting bearing 34, the drive bush 32, the rotation preventing mechanism 6 and the like are assembled to the frame 5, and the inner surface of the end plate 21 of the orbiting scroll 2 and the frame 5 are assembled.
The distance B from the left end face of is measured.

Next, a shim 60 having a thickness corresponding to the difference between the distances A and B is selected, and the shim 60 is sandwiched between the right end surface of the left housing 43 and the left end surface of the frame 5, and this state is set. Fixed scroll 1 by fastening left housing 43, frame 5 and right housing 49 with bolts 56
Gap between the orbiting scroll 2 and the orbiting scroll 2, that is, the tip surface of the spiral wrap 12 of the fixed scroll 1 and the orbiting scroll 2
The clearance between the inner surface of the end plate 21 and the end surface of the spiral wrap 22 of the orbiting scroll 2 and the inner surface of the end plate 11 of the fixed scroll 1 is maintained within the allowable dimension range.

[0016]

In the conventional scroll type fluid machine, the distance C and the distance D are measured, and the shim 60 having the thickness corresponding to the difference between the distances C and D is selected. Not only is it time-consuming to measure the distance C and the distance D, but there are two reference planes for measuring the distances C and D, that is, the right end face of the left housing 43 and the left end face of the frame 5, so an error occurs. There was a problem that it was easy.

[0017]

The present invention has been invented to solve the above-mentioned problems, and is characterized in that one surface of an outer peripheral flange of a frame is used as a reference surface,
The distance B between the reference surface and the end surface of the supporting portion of the frame and the distance A between the reference surface and the end surface of the end plate of the orbiting scroll incorporated on the frame are measured, and these distances A and B are measured. Accordingly, the shim for adjusting the tip clearance between the fixed scroll and the orbiting scroll is selected.

Another feature is that a shim is selectively fitted between the end surface of the supporting portion of the frame and the end surface of the fixed flange provided on the outer circumference of the end plate of the fixed scroll.

Another feature is that a bottom plate also serving as a shim is selectively fitted to the bottom surface of the spiral groove formed by the spiral wrap of the fixed scroll or the orbiting scroll.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be specifically described with reference to FIGS. The left end surface 5B of the outer peripheral flange 5A of the frame 5 is used as a reference surface, and the distance B from this reference surface 5B to the left end surface 5D of the support portion 5C that supports the fixed scroll 1 is measured. Next, the distance A from the reference surface 5B to the inner surface 25 of the end plate 21 of the orbiting scroll 2 incorporated in the frame 5 is measured.

After that, a shim 61 having a thickness corresponding to the difference between the distances A and B is selected, and the shim 61 is used, as shown in FIG. 2, with the left end surface 5D of the supporting portion 5C and the end of the fixed scroll 1. The fixed flange 15 formed on the outer periphery of the plate 11 is sandwiched between the fixed flange 15 and the right end surface 16, and in this state, the fixed scroll 1 is fixed by the bolt 64.
Fixed scroll 1 by fastening the
And the tip clearance of the orbiting scroll 2 is maintained within a predetermined allowable dimension range.

In FIGS. 1 and 2, 19 is a discharge valve 17.
A bolt for fastening the valve retainer 18 to the end plate 11 and a balance weight 35. The other configuration is the same as that of the conventional one shown in FIG. 5, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Since the distances B and A are measured with the left end surface 5B of the outer peripheral flange 5A of the frame 5 as a reference surface, the measurement is facilitated and the error is reduced.

As shown in FIG. 3, the bottom surface of the spiral groove formed by the spiral wrap 12 of the fixed scroll 1 also serves as a shim having a thickness corresponding to the difference between the distances A and B. The bottom plate 62 may be selectively fitted. In addition,
Although not shown, a bottom plate which also serves as a shim can be selectively fitted to the bottom surface of the spiral groove formed by the spiral wrap 22 of the orbiting scroll 2.

[0025]

According to the present invention, one surface of the outer peripheral flange of the frame is used as the reference surface, and the distance B between the reference surface and the end surface of the supporting portion of the frame and the orbiting scroll incorporated on the frame. The distance A between the end plate and the end surface of the end plate is measured, and a shim for adjusting the tip clearance between the fixed scroll and the orbiting scroll is selected according to these distances A and B. Therefore, there is one reference surface, and therefore, Distance A and B
And the error is reduced.

If the shim is selectively fitted between the end surface of the support portion of the frame and the end surface of the fixed flange provided on the outer circumference of the end plate of the fixed scroll, the chip gap can be easily brought within the allowable dimension range. Can be maintained.

The same effect as above can be obtained when the bottom plate of the spiral-shaped groove formed by the spiral-shaped wrap of the fixed scroll or the orbiting scroll is selectively fitted to the bottom plate also serving as the shim.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing a state at the time of measurement according to an embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of the scroll type fluid machine according to the first embodiment.

FIG. 3 is a partial vertical sectional view of a scroll type fluid machine according to a second embodiment of the present invention.

FIG. 4 is a partial vertical sectional view showing a state of a conventional scroll type fluid machine at the time of measurement.

FIG. 5 is a vertical cross-sectional view of a conventional scroll type fluid machine.

[Explanation of symbols]

 5 Frame 5A Outer flange 5B Reference surface 5C Support 5D End surface 4 Closed container 3 Rotating shaft 52 Bearing 1 Fixed scroll 11 End plate 12 Spiral wrap 15 Fixed flange 2 Orbiting scroll 21 End plate 22 Spiral wrap 25 End surface 6 Rotation Blocking Mechanism 61 Shim

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Fukushima, Inventor Masahiro Fukushima 1 Nakanobishi Engineering Co., Ltd., No. 60, Kutani, Nakamura-ku, Nakamura-ku, Nagoya (72) Tsuneo Yuzaki, Tsuneo Yuzaki Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Asahicho 3-chome No. 1 Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory (72) Inventor Houji Maruiwa No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya City Mitsubishi Heavy Industries Ltd. Nagoya Research Laboratory

Claims (3)

[Claims] 1. A pair of fixed scrolls and orbiting scrolls, wherein a frame having an outer peripheral flange is fixed in a closed container, a rotary shaft is supported by the frame, and a spiral wrap is erected on each end plate. A fixed flange provided on the outer periphery of the end plate of the fixed scroll, in which the orbiting scroll is engaged with the rotary shaft by interposing a rotation preventing mechanism between the end plate and the frame. In the scroll type fluid machine in which the above is fixed to the supporting portion of the frame, one surface of the outer peripheral flange of the frame is used as a reference surface, and the distance B between the reference surface and the end surface of the supporting portion of the frame and the reference surface The distance A between the end surface of the end plate of the orbiting scroll incorporated on the frame is measured, and the fixed scroll and Scroll fluid machine of the chip clearance adjustment method characterized by selecting a shim for adjusting the tip clearance between the times scroll. 2. The scroll according to claim 1, wherein the shim is selectively fitted between an end surface of a supporting portion of the frame and an end surface of a fixed flange provided on an outer circumference of an end plate of the fixed scroll. Tip clearance adjustment method for die-type fluid machinery. 3. The scroll-type scroll according to claim 1, wherein the bottom plate also serving as the shim is selectively fitted to the bottom surface of the spiral groove formed by the spiral wrap of the fixed scroll or the orbiting scroll. Fluid machine tip clearance adjustment method.