SU1453489A1 - Relay device - Google Patents

Abstract

The invention relates to automation and is intended to turn off the water heater when the preset temperature is exceeded in the control zone. The aim of the invention is to simplify the device and increase the reliability of its operation. The device contains an electromagnetic relay 1, through contacts 2 of which the load is connected to the terminals connected to the network, a ballast capacitor 9 and a diode bridge 8 through which the relay coil is connected to the terminals for connecting the supply network, the thyristor 6 and the thermal contact 7. To simplify the circuit and increase reliability of operation parallel to the winding of the relay 1, a thyristor 6 is connected, the anode of which through a resistor 12 is connected to the output of the diode bridge 8 and a capacitor 10, and the control electrode of the thyristor 6 is connected to the second through a thermal switch 7 in the network. 1 il. with O)

Description

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The invention relates to an automatic device and is intended to turn off electrical installations, such as electric heating elements of a water heater, when a predetermined temperature is exceeded in the control zone A.

The purpose of the invention is to simplify the device and increase the reliability of its operation.

I The drawing shows a diagram of the device.

The device contains an electromagnetic relay 1 with contacts 2, through which the electric heater 3 triggered by the device is connected to 1: Lemmas 4 and 5 connected to the network, thyristor 6, thermal switch 7, diode bridge 8, capacitors 9 and 10,

resistors 11 and 12.

The device operates as follows: 1 | az.

; When supply voltage is applied, sometimes a thermal contact that controls the superheat temperature of an electric heater, for example, a water heater, 1: | is closed, through a capacitor 9, a bridge diode 8, a resistor 11 and a relay The resistance of the capacitor 9. Under the Action of this current, rectified by the diode bridge 8 and the capacitor of the filter 10, the relay 1 is triggered. Through the closing contacts 2, an electric heater is connected to the circuit of the current KJoro, in case the temperature is in | Thermal contact zone 7 is set to the emergency value, p contacts (open and thyristor 6 locked. When the contact thermostat 7 closes its contacts in case of emergency overheating, the resistor 12 and the control electrode – cathode junction 6 are affected by the voltage determined by dropping the voltage across the resistor 1 1 and the coil of the relay 1, a half-wave high-current flow limited by the resistor 12 flows. Under the influence of this current, the thyristor 6 is unlocked, which shunts the coil of the re- 1. The relay switches off, disconnects its contacts 2 and turns off the elec 3. Under the action ronagrevatel constant T O | W, rectified by a diode bridge and the filter capacitor 10 flowing through the resistor 11 and the thyristor 6, poat edny held in the open state and by opening contactors termokon- 7 and detachably chain councils

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 thyristor from terminal 5. To re-enable operation of the device, it is necessary to de-energize the thyristor 6, for which it is necessary to disconnect terminals 4-5 from the network.

Thus, by connecting one output of the electromagnetic relay to the thyristor anode and through a resistor with the third output of the diode bridge, another output of the electromagnetic relay to the cathode of the thyristor and the third bridge, and the control electrode of the thyristor through the thermocontact with the second output connected to the network simplifies the device circuit eliminates the re-activation of the electric heating element after emergency overheating. Moreover, in case of short-term power failure in the network in the absence of an emergency overheating of the electric heating element, the order of operation of the device is not disturbed. All this allows the device to be widely used to protect, for example, water heaters, from overheating.

Claims (1)

Invention Formula A relay device containing an electromagnetic relay with a closing contact, an electric heater, a diode bridge, a ballast capacitor, a filter capacitor, a thermal switch, a resistor, a thyristor and outputs for connecting an AC network, the first and second outputs for connecting the AC network are connected to the first and second inputs diode bridge respectively through a ballast capacitor and directly, the filter capacitor is connected to the outputs of the diode bridge, the closing contact of the relay and the electric heater are turned on after Therefore, in order to simplify the operation and increase the reliability of the device, the first output of the relay coil is connected to the input of the thyristor and through the recorder to the first output of the diode bridge, the second output which is connected to the cathode of the thyristor and the second terminal of the relay coil, and the control electrode of the thyristor is connected via a thermal contactor to the second terminal to connect a network of alternating one that ..