JPH0343689A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To conduct a high precision rotation control by detecting the rotation positions of respective drive shafts of two scrolls which are rotated in the opposite direction mutually, and controlling independently respective scrolls by means of the same rotation position pattern and rotation speed pattern from these outputs. CONSTITUTION:At a scroll fluid machine which is provided within a shell with two scrolls 51, 52 assembled with eccentricity to each other, and which rotates respective scrolls 51, 52 in the opposite direction mutually by means of respective different motors 8, 12 through drive shafts 9, 15, respective drive shafts 9, 15 are fitted with rotation position detectors 53, 54. These output signals are inputted into a controller 55, and control signals are outputted from rotation position control circuits 64, 65 and rotation speed control circuits 68, 69 according to a rotation position pattern and a rotation speed patter which are from a rotation position pattern generation circuit and a rotation speed pattern generation circuit 60, 61. And respective control signals are impressed at respective motors 8, 12 through amplification circuits 72, 73, and the rotation of respective scrolls 51, 52 is controlled respectively and independently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a full-system rotation type scroll fluid machine in which both scrolls rotate.

[Traditional infarction]

Scroll fluid machines are generally known for use in, for example, compressors or vacuum pumps, and among these are scroll fluid machines of a full-system rotation type in which both scrolls rotate.

Conventionally, this type of scroll fluid machine has been developed, for example, in Japanese Patent Application Laid-Open No. 64
It is disclosed in Japanese Patent No. 15480 and is constructed as shown in FIG. To explain this based on the same figure,
In the same figure, the one indicated by the symbol l has a suction chamber 2 inside.
The first shell has a cylindrical shape as a whole, and is provided with an inlet 3 opening inward and outward on two sides. 4 is a second shell having a discharge chamber 5 therein;
A discharge port 6 that opens in the same direction as the suction port 3 is provided on the negative side of the first shell 1. 7 is a first motor rotated by a first motor 8;
The scroll is housed in the shell 1 mentioned above. Reference numeral 9 denotes a first drive shaft having an exhaust passage 9a extending in the axial direction and a discharge port 9b opening into the discharge chamber 5. The drive shaft 9 is integrally provided in the center of the first shell 1. A notch 10 opening in a direction perpendicular to the axis is formed in the surface.

A second scroll 11 is rotated by a second motor 12, is eccentrically combined with the first scroll 7, and is housed in the first shell 1. A compression chamber 13 is formed between the second scroll 10 and the first scroll 7, which moves from the outer periphery toward the inner periphery by the relative rocking of both scrolls 7°10. is configured to do so. In the center of this second scroll 10, there is a first scroll 7.
Similarly, a second drive shaft 15 having a notch 14 opening in a direction perpendicular to the axis is integrally provided. Reference numerals 16 and 17 indicate position sensors for detecting the notches 10 and 14, respectively, which are housed in the first shell l and located on the sides of the first drive shaft 9 and the second drive shaft 15, respectively. are provided and configured to detect the rotational position of each drive shaft 9.15. A controller 18 has a control circuit for synchronously rotating both scrolls 7.11, and is connected to the reposition sensor 16.17 via a signal cable 19.20, and is connected to the first motor 8 via a signal cable 21.
connected via.

The control circuit of this controller 18 includes circuits 22 and 23 that amplify the signals of the repositioning sensors 16 and 17, respectively, and the rotation speed of the first motor 8, as shown in FIG.

A PLL circuit 24 that compares the phase with one phase of the rotation speed of the second motor 12, a circuit 25 that corrects the signal of this PLL circuit 24 and the phase of the second motor 12, and amplifies the signal of this circuit 25. It is composed of a circuit 26 that performs the following steps. Note that symbols A and B in the figure indicate the direction of suction gas and the direction of discharge gas.

In operation of the scroll fluid machine configured in this way, the position sensors 16.17 detect the rotational position of each drive shaft 9.15, and the controller 18 adjusts the rotational speed and phase of the first scroll 7 to that of the second scroll. This is done by controlling the rotation speed and phase of 11 to match. At this time, the gas sucked into the suction chamber 2 from the suction port 3 by the rotation of both scrolls 7 and 11 is compressed in the compression chamber 13 between both scrolls 7 and l1, and is discharged through the exhaust path 9a, the discharge port 9b, and the The gas is discharged from the discharge port 6 to the outside of the shell at a higher pressure than the gas sucked in from the suction port 3 via the chamber 5.

By the way, in this type of scroll fluid machine, even if the phases of both scrolls 7.11 are slightly shifted, wear and heat generation may occur due to contact between the scrolls 7.11, or Since the performance may deteriorate due to an increase in the radial gap between the scrolls 7 and 11, strict precision is required in controlling the positions of both scrolls 7 and 11.

[Problem to be solved by the invention]

However, in the conventional scroll fluid machine, the rotation speed of the other scroll 11 is controlled to the 5 rotation position in accordance with the rotation speed of 1 rotation position of one scroll 7. If the rotational fluctuations of scroll 7 and scroll 7 are large, scroll 11 cannot be made to follow the rotation, and there is a limit to high precision control of the rotational speed and rotational position of both scrolls 7 and 11. As a result, there is a problem in that the scrolls come into contact with each other when starting up or stopping, causing wear and heat generation, which reduces the reliability of the fluid machine. Also, the fact that the rotational speed and rotational position of both scrolls 7.11 cannot be set with high precision is that both scrolls 7.11 and 11.
There is also a problem that a radial gap is sometimes formed between the holes 11 and 11, and gas leaks from this gap, resulting in a decrease in performance.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a scroll fluid machine that can improve the performance and reliability of the fluid machine.

[Means for Solving the Problems] A scroll fluid machine according to the present invention includes two scrolls that are eccentrically combined with each other and have drive shafts rotated in opposite directions by respective motors, and drive shafts of these scrolls. two rotational position detectors each detecting the rotational position of each scroll, and two rotational position detectors connected to both rotational position detectors and both mokes, and both side moving shafts are connected to the rotational position 9 of each scroll by the same rotational position pattern and the same rotational speed pattern. and a controller having a circuit that independently controls the rotational speed.

[For production]

In the present invention, the rotational speed and rotational position of both scrolls can be controlled with high precision by independently controlling the rotational position and rotational speed of the scrolls, each of which rotates in a direction opposite to the other, by a controller.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a diagram showing a scroll fluid machine and its control circuit according to the present invention. In the figure, the same members as in FIG. 2 are denoted by the same reference numerals, and detailed explanations are omitted. In the figure, scrolls indicated by reference numerals 51 and 52 are assembled eccentrically to each other and are provided in the first shell l, with the drive shaft 9 extending in the axial direction in the center. 15 are integrally provided. and,
Both scrolls 51 and 52 are connected to each other by the motor 8.
, 12 so as to rotate in opposite directions. Reference numerals 53 and 54 indicate rotational position detectors for detecting the rotational positions of the respective scrolls 51 and 52, which are attached to the tips of the drive shafts 9 and 15. 55 is a controller for rotating the drive shaft, and the above-mentioned both rotational position detectors 53
．． 54 via signal cables 56.57, respectively, and signal cables 58.57 to both said motors 8.12, respectively.
59. This controller 55 includes circuits 60.61 for generating rotational position patterns and rotational speed patterns that generate signals based on preset rotational position patterns and rotational speed patterns, and signal cables 62 connected to both of these circuits 60.61. .63, each motor 8,1 is connected by a signal of each rotational position pattern.
circuits 64 and 65 for controlling the rotational position of motors 8 and 12; The circuit 68.69 and
Signal cables 70 and 71 are connected to these two circuits 68 and 69, respectively.
The circuits 64, 65. The circuit 68
69, and circuits 72 and 73 for amplifying the output signals from 69, respectively. Among these, the circuit 60.61 is a circuit 60a for starting each of the motors 8.12 to a steady rotation speed and maintaining these steady rotation speeds.
.

61a, and circuits 60b and 61b for decelerating each of the motors 8 and 12 from a steady rotational speed and stopping the rotation, and each has a rotational position pattern and a rotational speed pattern that differ only in the rotational direction of the rotational motors 8 and 12. The signal shall be generated. Further, circuits 64 and 68 are connected to the rotational position detector 53 via the signal cable 56, and circuits 65 and 69 are connected to the rotational position detector 54.
is connected to the signal cable 57 via the signal cable 57. The circuit 72 is connected to the first motor 8 via the signal cable 58, and the circuit 73 is connected to the second motor 12 via the signal cable 59. 74 is a starting command signal for causing the circuits 60a and 61a to simultaneously generate starting position and speed patterns; 75;
is the circuit 60b.

This is a stop command signal for simultaneously generating a stop position and speed pattern in 61b.

In the scroll fluid machine configured in this way,
At startup, a startup command signal 74 is sent to each circuit 60a.

61a, signals of the rotational position pattern and rotational speed pattern for starting are sent to each motor 8 via circuits 64 and 65, circuits 68 and 69, and circuits 72 and 73.
, 12, the motors 8 and 12 are simultaneously driven and continue to rotate at a steady rotational speed. At this time, the rotation of the motors 8 and 12 is detected by each rotational position detector 53.5.
Since the output signal from 4 is fed back to circuit 64.65 and circuit 68.69, highly accurate control is performed.

On the other hand, when stopping, the stop command signal 75 is transmitted to each circuit 60b.
, 61b, signals of the rotational position pattern and rotational speed pattern for stopping are output to the circuits 64 and 659.
Since the signal is transmitted to the motors 8 and 12 via the circuits 68 and 69 and the circuits 72 and 73, the motors 8 and 12 are decelerated from a steady rotational speed and then stopped.

That is, in this embodiment, by independently controlling the rotational position and rotational speed of the scrolls 51 and 52, which rotate in opposite directions, by the controller 55, both the constant rotation at startup and the rotation up to the stop are controlled. The rotational speed and rotational position of the scroll 51.5'2 can be controlled with high precision.

In this embodiment, the circuits 60 and 61 for generating rotational position and rotational speed patterns include circuits 60a and 61a for generating starting position and speed patterns and circuits 60b and 61b for generating position and speed patterns for stopping. However, the present invention is not limited to this, and it is also possible to provide a circuit for generating a position/velocity pattern that accelerates or decelerates from an arbitrary rotational speed to an arbitrary rotational speed. No problem. In this case, the command signal for outputting the position/velocity pattern signal also requires the number of position/velocity pattern generation circuits, but the rotational speed of the scrolls 51, 52 can be changed as appropriate.

〔Effect of the invention〕

As explained above, according to the present invention, there are two scrolls, each of which is eccentrically assembled and has a drive shaft rotated in opposite directions by each motor, and the rotational positions of the drive shafts of both scrolls are detected. Two rotational position detectors and both side moving shafts connected to both rotational position detectors and both motors are independently controlled to control the rotational position and rotational speed of each scroll using the same rotational position pattern and the same rotational speed pattern. Since the scroll controller is equipped with a controller having a circuit for controlling the rotation speed and rotation position of both scrolls from startup to constant rotation to stop, it is possible to control the rotation speed and rotation position of both scrolls with high precision. Therefore, since the radial gap between the scrolls can be set within the allowable range set at the initial stage, gas leakage can be suppressed and the performance of the fluid machine can be improved. Furthermore, being able to set the rotational speed and rotational position of both scrolls with high precision prevents wear and heat generation due to contact between the scrolls when starting or stopping, which also increases the reliability of the fluid machine.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a scroll fluid machine according to the present invention and its control circuit, FIG. 2 is a sectional view showing a conventional scroll fluid machine, and FIG. 3 is a block diagram of the control circuit. 51, 52...Scroll, 53.54...Rotational position detector, 55...Controller, 60.61
... Circuit for generating rotational position pattern/rotational speed pattern, 64.65 ... Circuit for controlling rotational position, 68
．． 69...Rotation speed control circuit, 72゜73...
...Amplification circuit. 51.52 Varnish 7σ-1 and 53.54; Usutuki de cypress 55; Part 2 life use η same name Tohiro, 651 days speed 41 country m watchful knee 68.69: Sunfish retreat, f11 town circle - sight 72.73
:tf? 4 Same episode S Sea Figure 2 Figure 3

Claims (1)

[Claims] two scrolls each having a drive shaft that is eccentrically combined with each other and rotated in opposite directions by each motor; two rotation position detectors that respectively detect the rotational position of the drive shaft of both scrolls; The present invention is characterized by comprising a position detector and a controller connected to both the motors and having a circuit that independently controls the rotational position and rotational speed of each of the scrolls according to the same rotational position pattern and the same rotational speed pattern. Scroll fluid machine.