SU149689A1 - Device for automatic control of fluid level in open water bodies and reservoirs - Google Patents

Description

The known devices for automatic level control in open reservoirs and tanks, containing a float mounted on a swing arm, with a drum connected to a motor reducer, and contact groups through which voltage is applied to a servo drive are complex and do not provide high accuracy.

In the proposed device, the simplification of its design and an increase in the accuracy of the adjustment is achieved by using a cam mechanism, a spring (or a counterweight) driven by the motor, and a cable.

The drawing shows a schematic representation of the described device.

On the rocker arm / freely moving around axis 2 through rollers 3 by means of a cable 4, wound on a drum 5, connected by a gearbox to the engine 6, the float 7 is strengthened. On the lever / the controller selection direction 8 is also strengthened, contact group 9 signaling its extreme positions, as well as the portal open contact group 10.

For supplying command pulses through a contact group 10 to a servo drive, the duration of which depends on the deviation of the controlled level from a predetermined value, is a cam mechanism consisting of cams II driven by the motor 12 through the pinion 13, which improves the accuracy of fluid level control and simplifies device design. The engine 12, the cam mechanism and the contact group 10 are placed on a common support 14, which moves along the lever /, giving the opportunity to change the dead zone of the device; moreover, their extreme right position corresponds to the smallest insensitivity zone, and the leftmost one to its largest value. On the bracket 15 fortified engines № 149689 - 2

A drum 6 with a drum 5 with which the rotor of a variable-capacitor capacitor 16 is rigidly connected. To balance the lever / serves as a spring (or counterweight) 17.

In the absence of an adjustment, the lever / is in the neutral position, the contact groups 8, 10 are open, the engine 12 is de-energized and the whole system is at rest. When the liquid level drops below a predetermined float 7, the end of the lever / also lowers, the contact of the contact group 8 closes, energizing the engine / 2, which causes the cams to rotate //. As the end of the lever / lowers, the lower cam // , the raid on contact group 10, periodically closes the latter. If contact group 10 is closed, then a command impulse will be sent to the water trap control servo, in this case, the shutter is raised, and the duration of this impulse is proportional to the deviation value of the adjustable parameter. Moving the shutter up when the knob is in operation will cause the mark to increase and move the right end of lever 1 up. This will occur until the liquid level value reaches the target value and the / lever returns to its original position. If the disturbance was significant, a continuous continuous pulse will be sent to the servo drive of the command pulses, the upper contact of the contact group 9 will be closed, signaling to the dispatcher about an unacceptably high level of the water horizon. This contact can also be used to raise the idle discharge emergency boards or to close the boards.

With an increase in reach, the operation of the device is similar to that described with the only difference that in this case the upper cam // will participate in the operation, and the hydraulic locks will receive command impulses to lower.

When the setpoint of the controller operation zone changes, a command impulse is sent from the control room, as a result of which the motor 6 starts to rotate in a given direction, shortening or extending the cable 4. In the case of shortening the cable under the weight of the float 7, the end of the lever will lower and the controller will come into action, sending commanding pulses to the opening of the shields, which would entail an increase in the level of the liquid in the point controlled by the regulator. The process stops when the lever is set horizontally, which may be the case for a new value of the elevation of the horizon greater than previously set. The dispatch control of the change of the set point is carried out with the help of a capacitor that sets the generator frequency.

The described device for automatic liquid level control in open ponds and reservoirs can be used at the head water catchment structures of irrigation systems, at retaining and regulating structures, at water outlets, at automation of the water horizon in tanks with liquid and in pressure tanks.

Subject invention

A device for automatically adjusting the level of fluid in open reservoirs and tanks, comprising a float mounted on a swing arm, with a drum connected to a gearbox with an engine, and contact groups through which voltage is applied to a servo actuator, characterized in that, in order to increase control accuracy and simplify the design of the device, it applies a cam-driven mechanism rotated by the engine, which serves to feed command pulses through the contact group to the servo depends on the deviation of the regulated level from the specified value, and the spring or counterweight, which serves to balance the lever, and a cable wound on the drum is used to set the zone of operation of the regulator.

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