JPH0435930Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air motor rotation speed control device that suppresses air consumption of an air motor in a rotating machine using an air motor as a drive source.

[Conventional technology]

Generally, in a rotating machine using an air motor as a drive source, it is desirable to suppress the air consumption of the air motor to the necessary minimum from the viewpoint of energy saving. As an example of a conventional rotary machine using an air motor as a drive source, FIG. 1 shows an agitator for paints, solutions, etc. using an air motor 1. In the figure, 2 is a compressed air supply port, and 3 is a compressed air supply port.
is an exhaust port, 4 is a bevel gear, and 5 is a stirring propeller. The air supplied from the compressed air supply port 2 is
The air motor 1 is driven and the air is exhausted from the exhaust port 3.
The rotation of the air motor 1 is transmitted to the stirring propeller 5 via the bevel gear 4, and stirring is performed.

[The problem that the idea aims to solve]

However, in this type of system, air flow rate, agitator rotation speed, etc. are completely uncontrolled, so air pressure,
The rotation speed is determined by factors such as piping resistance, liquid volume, and viscosity. Therefore, the design is such that the air pressure and piping resistance have enough margin to prevent the agitator from stopping, and in normal operation, the rotation speed becomes excessive and the air consumption becomes more than necessary. There was a problem that it was not desirable from the point of view of energy saving.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air motor rotation speed control device that can suppress the rotation speed of the air motor to the necessary minimum and maintain air consumption at an appropriate value at all times, and has a large energy-saving effect.

[Means to solve the problem]

An air motor rotation speed control device according to the present invention for achieving the above object is comprised of the following devices. That is, a control valve that has a cock in the air path of the air motor, and when the cock is rotated in the valve opening direction, the air flow rate increases, and when the cock is rotated in the valve closing direction, the air flow rate is decreased. A detection pin is attached to a driven shaft of a rotary machine driven by an air motor so that the detection pin is always urged to rotate in the valve opening direction, and is rotatable together with the driven shaft. An air motor rotation speed control device, characterized in that the air motor rotation speed control device is capable of being intermittently engaged with the cock so as to rotate by a predetermined angle in the valve closing direction.

[Effect]

In such a device, the lock is rotated by a fixed angle in the closing direction by the detection pin for each revolution of the driven shaft. A rotational force is always applied to the lock so that it rotates at a constant speed in the opening direction except when the detection pin is engaged, so it returns to the closing direction only when the detection pin is engaged. . Then, the opening degree of the valve is determined by the difference between the amount by which the cock opens and the amount by which it is returned in the closing direction by the detection pin, thereby controlling the air flow rate. In other words, if the rotation speed of the driven shaft is high, the amount of return in the closing direction by the detection pin will be large, which will throttle the air flow and reduce the air motor rotation speed.On the other hand, if the rotation speed of the driven shaft is low, the air motor The rotational speed of the engine is controlled to be increased. By controlling the rotation speed of the air motor, the amount of air consumed by the air motor can be suppressed to the minimum amount necessary for the rotation of the driven shaft, reducing air consumption without impairing various functions caused by the rotation of the driven shaft. The energy saving effect is demonstrated.

〔Example〕

Preferred embodiments of the air motor rotation speed control device of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show an air motor rotation speed control device according to an embodiment of the present invention applied to an agitator for paint, solution, etc. In the figure, 6 is an air motor, and the air motor 6 supplies air from an air supply port 7 and discharges air from an exhaust port 8, thereby rotating internal blades 9 and rotating an output shaft 10. It's becoming like that. A bevel gear 11 is attached to the output shaft 10.
A driven shaft 13 of the stirrer is rotationally driven through a bevel gear 12 that meshes with the stirrer. The driven shaft 13 is provided with a detection pin 14 for detecting the rotational speed, and the detection pin 14 is attached to the driven shaft 13 so as to extend horizontally from the outer peripheral surface of the driven shaft 13.

An air pipe 15 is connected to the exhaust port 8 of the air motor 6, and a flow control valve 1 is connected to the air pipe 15.
6 is connected. Exhaust from the air motor 6 is exhausted from the exhaust port 16a of the flow control valve 16.
The flow rate control valve 16 is provided with a cock 17 that adjusts the flow rate of air passing through the flow rate control valve 16 . The pot 17 is attached with a mechanism (not shown), such as a spring mechanism, which can constantly apply a rotational force to the pot 17 to rotate the pot 17 in the opening direction at a constant speed.

Kotoku 17 is, as shown in FIG.
It is composed of a number of arms 19 extending radially from an axis 18 of 7. The positional relationship between the tip 17 and the detection pin 14 is such that when the detection pin 14 is rotated toward the tip 17, the detection pin 14
is in a positional relationship that allows it to engage with the arm 19. In addition, the rotational direction of the detection pin 14, that is, the driven shaft 1
The rotation direction of No. 3 is set so that when the detection pin 14 engages with the arm 19 and rotates the pot 17, the rotation direction becomes the closing direction.

Note that 20 in FIG. 2 is a stirring propeller, and its rotation stirs the paint, solution, etc.

In the air motor rotation speed control device of the present invention configured as described above, the rotation speed of the air motor and the amount of air consumed are controlled as follows.

The amount of air consumed by the air motor 6, that is, the amount of air supplied to the air motor 6 and discharged from the air motor 6, is controlled by a flow rate control valve 16 provided on the discharge side of the air motor 6. This amount of air is
It is controlled by adjusting the throttle amount by rotating the knob 17 of the flow rate control valve 16. Since a rotational force is constantly applied to the cock 17 so that it rotates at a constant speed in the opening direction, when no external force is applied,
The cock 17 rotates by itself at a constant speed in the opening direction. A detection pin 14 provided on the driven shaft 13 engages with the knob 17, and the detection pin 14 engages with the knob 17 every rotation of the driven shaft 13.
When the detection pin 14 engages with the detection pin 17, the rotation of the detection pin 14 causes the detection pin 17 to engage with the detection pin 14.
is rotated back in the closing direction by a certain angle that engages. The amount of throttling of the flow control valve 16 is controlled by the balance between the amount by which the cock 17 rotates in the opening direction by itself and the amount by which it is returned to the opening direction by the detection pin 14 within a certain period of time. In other words, if the rotation speed of the stirrer is high, detection pin 1 will be removed within a unit time.
The angle at which the handle 4 rotates the lock 17 back becomes larger than the angle at which the lock 17 opens by itself, the air flow rate is gradually narrowed, and the rotational speed of the air motor 6 decreases. On the other hand, if the rotation speed of the stirrer is low,
The angle at which the lock 17 opens itself within a unit time becomes larger than the angle at which the detection pin 14 turns the lock 17 back, the air flow rate gradually increases, and the rotational speed of the air motor 6 increases. Therefore, the rotation speed of the air motor 6 is controlled to be the minimum necessary rotation speed so that the rotation speed of the driven shaft 13 does not become too high or too low.
By controlling the rotational speed of the air motor 6 to the minimum necessary rotational speed, the amount of air consumed by the air motor 6 used for rotationally driving the air motor 6 is also controlled to the minimum necessary amount.

Note that the detection pin 14 is connected to the output shaft 1 of the air motor 6.
The flow control valve 16 may also be provided directly at the flow control valve 16.
may be attached to the air supply side of the air motor 6, and even in that case, the same rotational speed control function of the air motor 6 can be obtained. Further, even if a pressure control valve is used instead of the flow control valve, it is possible to control the air flow rate of the air motor in the same way.

[Effects of the invention] According to the air motor rotation speed control device of the invention,
The control valve that controls the amount of air flowing to the air motor is
This is done by balancing the rotation in the valve opening direction and the rotation in the valve closing direction, which is rotated according to the rotation of the driven shaft, so the rotation speed of the air motor can always be controlled to the minimum required rotation speed. This results in the effect that the amount of air consumed by the air motor can be kept at the minimum required amount at all times. Further, by appropriately suppressing the air consumption of the air motor, a large energy saving effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a conventional agitator using an air motor, FIG. 2 is a schematic diagram of an agitator using an air motor rotation speed control device according to an embodiment of the present invention, and FIG. 2 is a plan view of the vicinity of the flow control valve of the device shown in FIG. 2. FIG. 6... Air motor, 10... Output shaft, 13...
Driven shaft, 14...detection pin, 16...flow control valve, 17...knock, 20...propeller for stirring.

Claims (1)

[Scope of utility model registration request] In the air path of the air motor, there is a control valve that has a cock, and when the cock is rotated in the valve opening direction, the air flow rate increases, and when the cock is rotated in the valve closing direction, the air flow rate is decreased. A detection pin is attached to a driven shaft of a rotary machine driven by an air motor so as to be rotatable together with the driven shaft, and the detection pin is fixed so that the valve is closed per rotation of the detection pin. so that it rotates by a predetermined angle in the direction.
An air motor rotation speed control device, characterized in that the air motor rotation speed control device is capable of being engaged intermittently with the cock.