SU714051A1 - Subway fan control apparatus - Google Patents

Description

the latter is connected to the first input of the third element And, to the second input of which the brake output is connected, and the outputs of the first, second and second elements AND are connected via the OR element to the brake input, and the output of the third And element to the electric motor input.

The drawing shows a diagram of a device for controlling a fan, containing a block for setting modes 1, the outputs of which are connected to a reversing drive of a gate 2 with a limit switch 3, and a brake of an electric motor 5 of fan 6. The device additionally contains two steps of 7.8, 1ri element AND 9,10,11, element; OR 12 and zero speed clamp 13 va: la fan, the outputs of which are connected to the first inputs of elements And 9,10, the inputs of the last setting unit are connected to the second inputs of the latter through time sensors 7.8 1, third entry and AND 9 is connected to the first output of the limit switch 3, the second output of the latter is connected to the first input of the AND input element, to the second input of which the brake output 4 is connected, and the outputs of the AND elements 9,10 are connected through the OR 12 element to the brake input 4, and the output element And And - to the input of the electric motor 5. The device operates as follows. In the initial position, the motor 5 of the fan 6 and the reversing drive of the gate 2 are disconnected. The signals from the mode setting unit 1 are not received, and therefore, through the time sensors 7.8, the inputs of the AND 9 and 10 elements are not passed. Signals at the outputs of these elements and the OR 12 element are also absent. With this, the brake is disconnected and allows the fan shaft to turn under the action of the aerodynamic air pressure caused by the piston effect. The zero speed clamp 13 of the fan shaft 6 generates signals to the inputs of elements 9 and 10. However, this does not lead to the appearance of signals on the USB outputs and the activation of the brake 4, since signals from time sensors are at the second inputs of elements 9 and 10 7 and 8. It is also impossible to turn on the fan motor because there is no signal from the limit switch 3. In the off state of the fan, the limit switch is disconnected from the input of the element 11 M is connected to the third input of the element 9 When the fan starts the signal comes from the block Reference mode 1 reverse actuator slide 2 and causes it to be opened. Overnightly, the signal goes to time sensor 7, which is triggered and outputs a signal to the second input of the element 9, since the third input of this element is And there is a signal from the limit switch 3, then the signal at the output of the element 9 turns on when there is a signal from the latch zero speed 13 of the shaft hung torus, i.e. while rotating the shaft

under the action of the piston effect. If the shaft rotates, then during the time until time sensor 7 is turned on and the reversing drive of gate 2 will open the gate, output from element AND 9 through element OR 12 will be signaled to brake input 4. The brake will be applied at the specified time interval as long as the fan shaft is full. does not stop and the zero speed lock will not remove the signal from the first

element input 9. When the gate opens fully, the limit switch 3 will operate, the signal from the third input of element 9 will disappear and the signal on both inputs of element 11 will appear (the brake will be disconnected by this time).

Element And 11 will give a signal to start the motor 5, which will begin to rotate. Since the brake was on before starting, by the time the shaft-fan was started up

must stop completely. Putting a stationary fan into operation does not create an overload and does not increase the time for a complete set of revolutions. In case, when opening the gate, the limit switch does not work,

then after the expiration of the time delay of the time sensor 7, the signal from the second input and from the output, the course of the element n-a And 9 will disappear. Scheme start engine disassemble-1c and the inclusion of its bu. det canceled.

When stopping the veteran and electric motor with a mode I setting, the signal goes to the input of the reversing drive of the gate, which closes the gate. Simultaneously from the output of the mode setting block via

time sensor 8, the signal arrives at the second input element And 10. At the first input of this element And 10 receives a signal from the latch zero speed 13, as. at the time of shutdown, the speed of rotation of the fan shaft due to inertia cannot decrease to

zero From the output of the element And 10 signal through the element OR 12 is fed to the input of the brake 4 and turns it on.

Braking continues until

the shaft will not stop and the signal from the zero speed shaft stop at the first input of the element 10 will not disappear. The limiting time during which the brake can be applied is determined by the time delay set by

Time sensor 8, the output of which is connected to the second input of the element AND 10. When the time sensor is activated and the signal at the input of the element And 10 disappears, the device returns to its original position.

Thus, the use of this invention will improve reliability and reduce energy costs.

Claims (1)

Invention Formula A device for controlling a metro fan, containing a mode setting unit, whose outputs are connected to a gate drive with a limit switch, and a fan motor brake, characterized in that, in order to increase reliability and reduce energy costs, the device additionally c6 will hold two time sensors, three AND elements, an OR element and a zero speed clamp, the fan shaft, the output of which is connected The first inputs of the first and second elements are And, the second inputs of the last chorusch time sensors are connected to the outputs of the mode setting module, the third input of the first element is And is connected to the first output of the limit switch, the second output of the last is connected to the first input of the third element And, to the second input of which the brake output is connected, and the outputs of the first and second elements AND are connected via the OR element to the brake input, and the output of the third element I - to the electric motor input; Sources of information taken into account in the examination 1. Ventilation installations of the metro, constructed by the open method. Model project No. VU-01, 03. M., Metrogyprotrans, 1972, Album III, sheet TS-107/62.