JPH03267590A - Positioning device for scroll fluid machinery - Google Patents

Abstract

PURPOSE:To secure the uniform positioning precision and improve the service life and compression efficiency by positioning a fixed scroll to a casing and a turning scroll by driving each adjusting means on the basis of the displacement quantity of the fixed scroll which is detected by each shift quantity detecting means. CONSTITUTION:If each lap part 13 of a turning scroll 10 and a fixed scroll 16 contacts when the turning scroll 10 is turned, the fixed scroll 16 shifts in the radial direction. Then, the displacement quantity of the fixed scroll 16 is detected by each shift quantity detecting means 37, and each adjusting means 35 is driven on the basis of the displacement quantity. Accordingly, the fixed scroll 16 is pushed to the optimum position to the turning scroll 10, and the automatic position adjustment is performed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a positioning device for a scroll fluid machine that is suitable for use in, for example, an air compressor, a vacuum pump, etc. This invention relates to a positioning device for an oil-free scroll fluid machine that does not supply oil or the like.

[Conventional technology]

In general, there are two types of scroll fluid machines: oil-supplied type that supplies lubricating oil etc. between the orbiting scroll and fixed scroll, and oil-free type that does not supply lubricating oil between them. The figure shows an example in which an oil-free scroll fluid machine is used as an air compressor.

In the figure, reference numeral 1 indicates a casing formed in a stepped cylindrical shape. Part 3 and
The lower end side of the casing l is covered by the bottom cover part 4. Reference numeral 5 denotes an annular thrust bearing provided on the inner flange portion 3A of the large diameter cylinder portion 3, and the thrust bearing 5 is connected to an orbiting scroll 10 which will be described later.
It is designed to receive the load in the thrust direction by slidingly contacting the back surface of the

Reference numeral 6 indicates a drive shaft located on the axis O-0 and rotatably provided in the casing 1 via bearings 7, 7 and 8, and the lower end side of the drive shaft 6 protrudes outside the casing 1 to drive the motor. (not shown), and its upper end side is connected to the large diameter cylindrical part 3
It extends inward to form a crankshaft 6A, and the axis of the crankshaft 6A is 0. -0. is eccentric by a predetermined dimension δ with respect to the axis O-0 of the drive shaft 6. Then, the drive shaft 6
A balance weight 9 is positioned and fixed in the large diameter cylindrical portion 3 on the upper side thereof to maintain rotational balance during rotation.

Reference numeral 10 denotes an orbiting scroll rotatably attached to the distal end side of the crankshaft 6A of the drive shaft 6 via an orbiting bearing 11, and the orbiting scroll 10 includes an end plate 12;
A spiral wrap portion 13 erected in front of the mirror plate 1
The wrap portion 13 and the wrap portion 18 of the fixed scroll 16, which will be described later, overlap to form the compression chamber 1 as a closed space.
5.15. It is designed to define...

Reference numeral 16 indicates a fixed scroll having a stepped portion 16A and provided in the casing 1 facing the orbiting scroll 10. It is fixed onto the large-diameter cylindrical portion 3 of the casing 1 by means of fixing means such as bolts (not shown) so as to cover it. Then, the fixed scroll 1
6 is generally composed of an end plate 17, a spiral wrap portion 18 erected in front of the end plate 17, and a flange 19 formed on the outer peripheral side of the end plate 17 so as to surround the wrap portion 18. ing. Further, the flange 19 of the fixed scroll 16 is provided between the end plate 12 of the orbiting scroll 10 to prevent rotation of the orbiting scroll 10 when the drive shaft 6 rotates, and to prevent the orbiting scroll 10 from rotating around the axis o-o. An auxiliary crank (not shown) is provided that provides only a turning (revolution) movement with a turning radius δ.

Reference numerals 20 and 21 indicate a suction boat and a discharge boat formed on the fixed scroll 16. The suction boat 20 is bored in the flange 19 so as to communicate with the compression chamber 15 on the outermost circumferential side, and the discharge boat 21 is a A hole is formed in the center of the end plate 17 so as to communicate with the compression chamber 15.

A scroll type air compressor according to the prior art has the above-mentioned configuration, and its operation will be explained next.

When the drive shaft 6 is rotated in the direction of arrow A by the motor,
This rotation is transmitted from the crankshaft 6A to the orbiting scroll 10 via the orbiting bearing 11, and the orbiting scroll 10 comes to revolve around the axis O-o of the drive shaft 6 with a orbiting radius δ. While each compression chamber 15 defined between the wrap portion 13 of 1o and the wrap portion 18 of the fixed scroll 16 is continuously reduced, and the air sucked from the suction boat 20 is compressed within each compression chamber 15,
A compression action is performed by sequentially discharging this compressed air from the discharge boat 21 to an external air tank (not shown) or the like.

Here, if the fixed scroll 16 is not accurately positioned with respect to the casing 1 and the orbiting scroll 10 and is fixed to the casing l, when the orbiting scroll 1o is orbited by the drive shaft 6, the lap portion 13 of the orbiting scroll 1o and the wrap portion 18 of the fixed scroll 16, and a so-called galling phenomenon occurs between the wrap portions 13 and 18, resulting in a decrease in life, reliability, performance, etc. Strict accuracy is required for positioning with respect to the casing 1 and the orbiting scroll IO.

According to the prior art, the positioning of the fixed scroll 16 with respect to the casing 1 and the orbiting scroll 10 is performed manually by skilled workers. That is, first, the orbiting scroll 10 is assembled into the casing 1, the fixed scroll 16 is combined with the orbiting scroll 10, and the orbiting scroll 10 is manually rotated via the drive shaft 6. Judging whether the parts 13 and 18 are in contact with each other is determined based on experience based on the presence or absence of a minute orbiting movement of the fixed scroll 16, the feeling of minute frictional resistance during 10 rotations of the orbiting scroll, or a small abnormal noise, etc. The fixed scroll 16 is positioned relative to the casing 1 and the orbiting scroll 10 while manually adjusting the position of the scroll 16.

[Problem to be solved by the invention]

However, in the above-mentioned conventional technology, the positioning of the fixed scroll 16 with respect to the casing 1 and the orbiting scroll 10 is manually performed by skilled workers, which reduces productivity and makes it difficult to mass-produce scroll compressors. In addition to this, the positioning of the fixed scroll 16 is done based on the experience of the workers.
There is a problem in that "variations" occur in positioning accuracy, making it impossible to equalize quality such as life and compression efficiency. In addition, in the case of an oil-supplied scroll air compressor, lubricating oil or the like is sealed between the orbiting scroll 10 and the fixed scroll 16, so an oil film is formed between each wrap portion 13, 18. By each wrap part 13
．． A gap can be formed between 18 and relatively fixed scroll 1
However, in an oil-free scroll air compressor, there is no oil film between the lap parts 13 and 18, so positioning the fixed scroll 16 is difficult even for experienced workers. The problem is that it is very difficult.

Furthermore, recently there has been a significant shortage of workers in the manufacturing industry, and it is extremely difficult to secure and train skilled workers. There is a problem in that this leads to a decline in product competitiveness.

The present invention has been made in view of the problems of the prior art described above.The present invention can automatically position the fixed scroll with respect to the casing and the orbiting scroll, uniformize the positioning accuracy, and improve performance such as life and compression efficiency. It is an object of the present invention to provide a positioning device for a scroll fluid machine that can significantly improve productivity, and also facilitate mass production by increasing productivity.

[Means to solve the problem]

In order to solve the above-mentioned problems, the features of the configuration adopted by the present invention are: a fixed base for fixing a fixed scroll in a state in which the fixed scroll is freely combined with a casing incorporating an orbiting scroll; a plurality of displacement detection means disposed at predetermined intervals in the direction and detecting the amount of displacement in the radial direction of the fixed scroll when the orbiting scroll is rotated; and a plurality of adjustment means arranged at predetermined intervals in the circumferential direction to adjust the position of the fixed scroll with respect to the orbiting scroll, and each adjustment means is adjusted based on the amount of displacement of the fixed scroll detected by each of the displacement amount detection means. The fixed scroll is driven to position the fixed scroll relative to the casing and the orbiting scroll.

[Operation J] With the above configuration, when the orbiting scroll and the fixed scroll contact each other when the orbiting scroll is rotated, the fixed scroll is displaced in the radial direction, and the displacement amount of the fixed scroll is The fixed scroll can be pushed to the optimum position relative to the orbiting scroll by detecting each displacement amount using the displacement detection means and driving each adjustment means based on these displacement amounts, thereby making it possible to perform automatic position adjustment. Become.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 7. In this embodiment, the same components as those in the prior art described above are denoted by the same reference numerals, and their explanations will be omitted.

In the figure, numeral 31 indicates a fixing base for fixing the casing 1, and the casing 1 is inserted into the insertion hole 31A of the fixing base 31 and fixed to the fixing base 31. 32, 32
．． ... are four rail members (only two shown) attached to the upper surface of the fixing base 31 at 90 degrees apart from each other in the circumferential direction of the insertion hole 31A of the fixing base 31, 33.33.
. . indicate four support stands (only two are shown) movably provided above each rail member 32, and from each support stand 33, mounting plates 34, 34. ...is protruding upward. And the mounting hole 34A of the mounting plate 34
A feeding device 35, which will be described later, is provided, and a micrometer 37, which will be described later, is attached to the mounting hole 34B.

35.35. ... are arranged at intervals of 90 degrees in the circumferential direction of the fixed scroll 16 via the respective mounting plates 34,
Four feeding devices (only two shown) are shown as adjustment means each having a built-in motor (not shown), etc., and each feeding device 35
An adjustment rod 35A has a screw thread formed around the entire circumference on the tip side.

35A is movably provided, and its base end side is connected to a control unit 39 side, which will be described later, via a harness 3636. Each of the feeding devices 35 sends out the adjustment rod 35A in response to a drive signal output from the control unit 39 via the harness 36 etc., and pushes the stepped portion 16A of the fixed scroll 16 in the radial direction. The position of the scroll is adjusted relative to the casing 1 and the orbiting scroll 10.

37.37. . . . is a displacement detection means located below each of the feeding devices 35 and spaced apart from each other by 90 degrees in the circumferential direction of the fixed scroll 16 together with each feeding device 35 via each mounting plate 34. The micrometers 37 detect the amount of radial displacement of the fixed scroll 16 by the displacement of the displacement rod 37A, and the detected displacement signal is transmitted to the harness 38. .38 to the control unit 39 side.

Reference numeral 39 denotes a control unit that has a built-in arithmetic processing section, storage section, interface section (all not shown), etc. The control unit 39 includes a keyboard 39A for an operator to input commands from the outside, and a fixed Display 3 that displays the positioning status of the scroll 16, etc.
9B, etc., and the control unit 39 is connected to an input/output control device 40 via a harness 41. The control unit 39 is connected to each feeding device 35 and each micrometer 37 via an input/output control device 40, etc., and performs the control processing shown in FIG. 2 based on the displacement signal from each micrometer 37. The positioning adjustment amount of the fixed scroll 16 is calculated, and a drive signal corresponding to this adjustment amount is output to each feeding device 35.

The positioning device for a scroll fluid machine according to this embodiment has the above-mentioned configuration. Next, the operation when positioning the fixed scroll 16 of a scroll air compressor using the positioning device will be described.

First, as shown in FIG. 3, the casing 1 in which the orbiting scroll 10 is assembled is inserted into the insertion hole 31A of the fixed base 31 and fixed to the fixed base 31, and then the fixed scroll 10 is placed on top of the casing 1.
6 are combined so that the wrap portion 18 thereof overlaps with the wrap portion 13 of the orbiting scroll 10 to be in a free state. Next, as shown in FIGS. 4 and 5, each support stand 3
3 is the mounting plate 34. Feeding device 35. Together with the micrometer 37 and the like, the adjusting rod 35A of the feeding device 35 and the displacement rod 37A of the micrometer 37 are moved to a position where they are in contact with the outer peripheral side surface of the fixed scroll 16, respectively.

Therefore, when the operator inputs a command to the control unit 39 via the keyboard 39A, the control unit 39 positions the fixed scroll 16 (
The control process shown in FIG. 2 is performed. That is, in step 1, the motor connected to the lower end side of the drive shaft 6 is driven, thereby rotating the orbiting scroll 10 in the direction of arrow A shown in FIG. 5 via the drive shaft 6 and the like. In this case, since the lap portion 18 of the fixed scroll 16 and each wrap portion 13 of the orbiting scroll 1o are in uneven contact with each other, the fixed scroll 16 initially makes a relatively large orbit following the orbit of the orbiting scroll 10. Although the fixed scroll 16 starts to move, as it continues to rotate, the lap parts 13 and 18 gradually become familiar and come into uniform contact, and the rotation of the fixed scroll 16 converges to a relatively small one (Fig. 6). reference)
.

Then, in step 2, a displacement signal is read from each micrometer 37, and in step 3, based on this displacement signal, it is determined whether or not the rotation of the fixed scroll 16 has become a minute rotation. Now, if rYESJ is determined in step 3, each wrap portion 13.18 is in uniform contact (7th
(see figure (a)), the motor is stopped and the process moves to step 4. In step 4, the positioning adjustment amount of the fixed scroll 16 is calculated based on the displacement signal read from each micrometer 37, and in step 5, this adjustment is performed. A drive signal based on the amount is output to each feeding device 35 to drive each feeding device 35, and the fixed scroll 16 is outputted via the adjustment rod 35A.
is pushed in the direction of arrow B shown in FIG. Then, the position of the fixed scroll 16 is adjusted with respect to the orbiting scroll 10 (see FIG. 7(b)).

On the other hand, if rNOJ is determined in step 3, the process returns to step 1 and the motor is rotated again. Then, in step 6, the operator is informed via the display 39B that the positioning of the fixed scroll 16 has been completed, and the operator fixes the fixed scroll 16 onto the large diameter cylindrical portion 3 of the casing 1 using fixing means such as bolts. Fix it.

Therefore, according to this embodiment, the positioning device for a scroll fluid machine includes a micrometer 37 that detects the turning state of the fixed scroll 16 via the displacement rod 37A, and a micrometer 37 that detects the rotation state of the fixed scroll 16 via the displacement rod 37A, and a micrometer 37 that detects the rotation state of the fixed scroll 16 via the displacement rod 37A. Four feeding devices 35 for adjusting the position of the fixed scroll 16 with respect to the casing 1 and the orbiting scroll 10 are arranged at intervals of 90 degrees in the circumferential direction of the fixed scroll 16. meter 37
A control that calculates the positioning adjustment amount of the fixed scroll 16 based on the displacement signal from the controller and outputs a drive signal based on the adjustment amount to each feeding device in order to position the fixed scroll 16 with respect to the orbiting scroll 10 and the casing 1. Since the unit 39 is provided, the fixed scroll 16
The positioning of the casing 1 and the orbiting scroll 10 can be performed automatically and quickly, and the positioning accuracy of the fixed scroll 16 can be made uniform with high precision, improving performance such as lifespan, compression efficiency, and durability. In addition to significantly improving productivity, mass production can be easily achieved by increasing productivity. The positioning device includes a fixing base 31 of a simple structure, and a feeding device 35 for mass-produced products. Micrometer 37
and a control unit 39, the entire positioning device can be made at low cost, and
It has various effects, such as being extremely easy to install on existing production lines.

In the above embodiment, each feeding device 35 and each micrometer 37 are arranged at intervals of 90 degrees in the circumferential direction of the fixed scroll 16, but instead of this,
Each feed device 35 and micrometer 37 are
They may be arranged at predetermined intervals other than 90 degrees in the circumferential direction of the fixed scroll 16. 35 can push the fixed scroll 16 in the radial direction, and the number and position of each micrometer 37 can be such that the amount of displacement of the fixed scroll 16 in the radial direction can be detected.

Further, in the above embodiment, the electric micrometer 37 is used as the displacement amount detection means, and the displacement rod 37A thereof is brought into contact with the outer peripheral side surface of the fixed scroll 16 to detect the displacement amount of the fixed scroll 16. However, instead of this, a laser distance measuring sensor may be used as the displacement amount detection means, or a simple image processing device for dimension measurement using an ITV camera may be used. In this case,
The amount of displacement of the fixed scroll 16 can be detected without contact.

Further, in the embodiment described above, the screw feeding device 35 is used as the adjusting means, but the present invention is not limited to this, and other feeding devices such as a linear motor, a handling robot, etc. can be used as the adjusting means. In general, any device that can adjust the position of the fixed scroll 16 based on a drive signal from the control unit 39 is sufficient.

Further, in the embodiment described above, each feeding device 35 and each micrometer 37 are attached to the mounting plate 34 on the support base 33, but instead of this, each feeding device 35 and each micrometer 37 is attached to a fixed scroll. 16 may be used from above to support the fixed scroll 16 at intervals of 90 degrees in the circumferential direction. Each micrometer 37 is connected to the fixed scroll 16.
It is sufficient if the amount of displacement in the radial direction can be detected.

Further, in the embodiment described above, an input/output control device 40 is provided outside the control unit 39, and signals are transmitted and received with each feeding device 35 and micrometer 37 via the external input/output control device 40, etc. However, instead of this, the input/output control device 40 may be implemented as an electronic board and stored within the control unit 39.

Further, in the above embodiments, the case where the positioning device is used for positioning the fixed scroll of a scroll type air compressor has been described as an example, but the present invention is not limited to this, and the present invention is not limited to this. scroll fluid machinery, etc.
Needless to say, the present invention can also be applied to positioning other scroll fluid machines.

[Effects of the Invention] As detailed above, according to the present invention, there is provided a fixing base for fixing a fixed scroll in a state in which the fixed scroll is freely combined with a casing incorporating an orbiting scroll; a plurality of displacement amount detection means arranged at intervals and configured to detect the amount of displacement in the radial direction of the fixed scroll when the orbiting scroll is rotated; a plurality of adjusting means arranged at predetermined intervals and adjusting the position of the fixed scroll with respect to the orbiting scroll, and driving each of the adjusting means based on the amount of displacement of the fixed scroll detected by each of the displacement amount detecting means, Since the fixed scroll is configured to be positioned with respect to the casing and the orbiting scroll, each displacement amount detection means can detect the amount of displacement in the radial direction of the fixed scroll, and each adjustment means can detect the amount of displacement in the radial direction of the fixed scroll based on each amount of displacement. By driving the fixed scroll, the fixed scroll can be automatically positioned relative to the casing and the orbiting scroll, and productivity can be increased, making it possible to significantly improve reliability and performance. Become.

[Brief explanation of drawings]

1 to 7 show embodiments of the present invention, and FIG. 1 is an overall system diagram of a positioning device for a scroll fluid machine;
Fig. 2 is a flowchart showing the positioning control process for the fixed scroll, Fig. 3 is a vertical cross-sectional view of the scroll compressor showing the state in which the fixed scroll is combined with the casing in which the orbiting scroll is incorporated, and Fig. 4 is the main part of the positioning device. FIG. 5 is an enlarged vertical sectional view showing the feeding device for the fixed scroll. Explanatory diagram showing the state where the micrometer is in contact, No. 6
The figure is an explanatory diagram showing a state in which the fixed scroll is making a slight revolution, and Figures 7 (a) and (b) are enlarged views of the different adjustment states of the wrap part of the orbiting scroll and the wrap part of the fixed scroll. FIG. 8 is a longitudinal sectional view of a scroll compressor showing a conventional technique. 1... Casing, 10... Orbiting scroll, 12
... end plate, 13 ... wrap section, 15 ... compression chamber (
(closed space), 16... Fixed scroll, 17... End plate, 18... Wrap section, 31... Fixed base, 35...
- Feeding device (adjustment means) 37... Micrometer (displacement detection raw stage) 39... Control unit. Patent applicant Tokico Co., Ltd.

Claims (1)

[Claims] a casing; and a rotatably disposed within the casing;
An orbiting scroll having a spiral wrap portion erected on an end plate; and a spiral wrap fixed to the casing facing the orbit scroll and overlapping the wrap portion of the orbit scroll on the end plate to form a sealed space. A scroll fluid machine equipped with a fixed scroll having an upright section, a fixing base for fixing the fixed scroll in a state in which the fixed scroll is freely assembled to a casing incorporating the orbiting scroll, and a casing around the fixed scroll. a plurality of displacement amount detecting means arranged at predetermined intervals in the direction and detecting a radial displacement 1 of the fixed scroll when the orbiting scroll is rotated; and a plurality of adjustment means arranged at predetermined intervals in the circumferential direction to adjust the position of the fixed scroll with respect to the orbiting scroll, and each adjustment means is adjusted based on the amount of displacement of the fixed scroll detected by each of the displacement amount detection means. 1. A positioning device for a scroll fluid machine, characterized in that the fixed scroll is driven to position the fixed scroll with respect to a casing and an orbiting scroll.