RU2443938C2 - Automatic boiler safety valve control device - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: automatic boiler safety valve control device containing the grid actuation contacts, magnetic conductor with coil, armature and stock, valve body with inlet and outlet connection pipes. Three time relays are parallel connected to the power supply and to each other through the switch and have various time set points, coil of electromagnet; at that, normally closed contact of the second (electromagnetic) relay is in series connected with the first relay, and parallel to the first relay there connected is indicating light, the third (electromagnetic) relay and the second (electromagnetic) relay through normally open contact of the third (electromagnetic) relay and normally closed contact of the first relay, which are in series connected to each other and to the power supply; at that, parallel to the second (electromagnetic) relay there connected is indicating light and through limit switch, the microswitch of which is rigidly connected to the valve cover plate, there connected is contactor switch, and parallel to the third (electromagnetic) relay there electrically connected through the contactor switch contact is audio warning device and indicating light.

EFFECT: device allows improving the reliability of actuation and simplifying the design.

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Description

The invention relates to mechanical engineering, to valve control circuits, and is intended to prevent an increase in the pressure of the medium above the permissible level.

Known controlled metering valve (US Pat. RF №2329426, F16K 31/02). An electrically controlled metering valve containing a housing with input and output channels, in which a spring-loaded plunger is installed with an electric drive for moving it, including two electric coils located at a distance from each other, connected through a control unit to a current pulse generator, and a movable disk magnetically connected to the coils located between them and connected to one of the ends of the plunger, on the other end of which a locking element of the inlet valve is fixed. The disk is made of a non-magnetic material with a specific ohmic resistance, which ensures the induction of eddy currents in it when current pulses are applied to one or another coil.

Non-magnetic material is selected with a specific ohmic resistance not exceeding 1.5 · 10 ^-8 Ohm · m. The material of the disk is aluminum.

The disadvantages of the device:

1. the complexity of the connection;

2. the complexity of the design of the metering valve;

3. low maintainability of the metering valve mechanism;

4. a strong dependence of the dosing process on the pressure of the liquid in the supply containers and the inability to adjust.

The closest analogue to the claimed device includes a solenoid valve control device (RF application No. 98100698, F16K 31/02) containing a shutter with an armature and a rod, a magnetic circuit with a coil, a valve body with inlet and outlet nozzles, power on contacts, a rectifier and an electrolytic capacitor . It is equipped with a contact group interacting via a sealing device with a rod, the coil is double-wound, with a coil ratio of 5/1, and the electrolytic capacitor is connected in parallel with a large number of turns. The electrolytic capacitor is connected in series to the coil circuit of the electromagnet.

The disadvantages of this device:

1. the complexity of the device;

2. If the electrolytic capacitor is incorrectly connected (in polarity), it is possible to destroy both the capacitor itself and the entire circuit, which will lead to failure of the entire object.

The objective of the invention is to simplify the control device of the safety valve and increase the reliability of operation.

The problem is solved due to the fact that the automatic control device for the safety valve of the boilers contains the power on contacts, a magnetic circuit with a coil, an anchor and a rod, a valve body with inlet and outlet pipes. Three time relays having different time settings and an electromagnet coil are connected in parallel to the power source and to each other through a switch. In this case, a normally closed contact of the second (electromagnetic) relay is connected in series with the first relay, and a light annunciator, a third (electromagnetic) relay and a second (electromagnetic) relay are connected in parallel with the first relay through the normally open contact of the third (electromagnetic) relay ) relay and normally closed contact of the first relay. At the same time, a light annunciator is connected in parallel with the second (electromagnetic) relay. A contactor is connected through an end switch, the end of which is rigidly connected to the valve cover, and sound and light signaling devices are electrically connected through the contactor contact in parallel with the third (electromagnetic) relay.

New significant features:

1. parallel to the power source and to each other through the switch are connected three relays having different time settings, and an electromagnet coil;

2. a normally closed contact of the second (electromagnetic) relay is connected in series with the first relay;

3. parallel to the first relay, a light signaling device, a third (electromagnetic) relay and a second (electromagnetic) relay are connected through a normally open contact of the third (electromagnetic) relay and a normally closed contact of the first relay in series with each other and with the power source;

4. parallel to the second (electromagnetic) relay, a light annunciator is connected;

5. through the limit switch, the end of which is rigidly connected to the valve cover, a contactor is connected;

6. parallel to the third (electromagnetic) relay, they are electrically connected through the contactor contact of the sound and light signaling devices.

The above new essential features, together with the known ones, are necessary and sufficient to achieve a technical result in all cases to which the requested amount of legal protection applies.

The technical result, which consists in simplifying the device, is achieved by using only three time relays with their contacts, which will significantly increase the reliability of the device. The device is easy to assemble and maintain. When the valve is opened, a light signal is sent to the operator control panel. Since the limit switch limit switch is rigidly connected to the valve cover, when the first relay and the second (electromagnetic) relay are activated and the valve does not operate, the sound and light signals will be sent to the control panel. Upon receipt of light and sound signals, the operator is able to manually “blow up” the boiler valve. This device allows you to regularly automatically make a short-term opening of the cover of the safety valve in order to prevent its "sticking" and, as a consequence, the explosion of the boiler.

Figure 1 - schematically shows a device for automatically controlling the safety valve of boilers.

The boiler safety valve automatic control device includes a safety valve cover 1, rigidly connected through a rod 2 with an armature 3 of an electromagnet 4 with a winding 5, in parallel with which three relays with different time settings are connected: the first relay 6, the second (electromagnetic) relay 7 and the third (electromagnetic ) relay 8, with its contacts: normally closed contact (KT1) 9, normally closed contact (KT2) 10 and normally open contact (KT3) 11, respectively, and power supply 12 through switch 13. Relay 6 with a larger the time setting is connected through a normally closed contact 10 of the (electromagnetic) relay 7 with a smaller time setting to the power source 12 through the switch 13. In parallel with the relay 6 with a higher time setting, a light signaling device 14, an (electromagnetic) relay with a delay of 8 and an (electromagnetic) relay are connected 7 with a smaller time setting via the normally open terminal 11 of the (electromagnetic) relay 8 and the normally closed terminal 9 of relay 6. Parallel to the (electromagnetic) relay 7 are connected: a light signaling device 15 and through normal o closed contact 16 of the limit switch 17, rigidly connected to the valve cover 1, the contactor 18 is connected and the normally open contact 19 is connected in series with it. Parallel to the third (electromagnetic) relay 8, the normally open contact 19 of the contactor 18 and the light 20 and the sound are connected in series 21 signaling devices.

The device operates as follows.

When you turn on the power source 12 through the switch 13, the voltage is supplied to the relay 6 through a normally closed contact 10 of the second (electromagnetic) relay 7 and the third (electromagnetic) relay 8. The first relay 6 has a time setting of twelve hours, the second (electromagnetic) relay 7 - 2- 3 s and the third (electromagnetic relay) 8 - 1 s. The normally closed contact 9 of the first relay 6 opens, and the normally open contact 11 of the third (electromagnetic) relay 8 closes after 1 second and remains closed all the time the circuit operates. Valve cover 1 is closed. After twelve hours, the first relay 6 is activated and closes the open contact 9 of the first relay 6 and thereby supplies power to the second (electromagnetic) relay 7 and the voltage to the coil 5 of the electromagnet 4. The armature 3 is attracted to the electromagnet 4 and acts on the valve cover 1 through the rod 2, which opens for 1 s. In this case, the trailer 17 is activated and opens its normally closed contact 16. The power to the contactor 18 is not supplied and its normally open contact 19 remains open and the power is not supplied to the light 20 and sound 21 signaling devices. After 2 s, the second (electromagnetic) relay 7 is activated, which, opening the normally closed contact 10, removes voltage from the first relay 6. It opens its normally closed contact 9 and the second (electromagnetic) relay 7 de-energizes and closes its open contact 10. When open pin 9 of the first relay 6 there is no voltage on the winding 5 of the electromagnet 4 and the armature 3 through the rod 2 closes the valve cover 1. Then the cycle repeats.

In the event that the circuit malfunctions, then when the voltage is applied to the winding 5 of the electromagnet 4, the valve cover 1 does not undermine. Then the terminal 17 does not work and does not open its normally closed contact 16. In this case, the contactor 18 receives power and closes its normally open contact 19, supplying voltage to the circuit of the light 20 and sound 21 signaling devices.

Claims (1)

A device for automatically controlling the boiler safety valve, which contains the network connection contacts, a magnetic circuit with a coil, an armature and a rod, a valve body with inlet and outlet nozzles, characterized in that three time relays are connected in parallel with the power source and to each other through a switch, having different time settings, an electromagnet coil; in this case, a normally closed contact of the second (electromagnetic) relay is connected in series with the first relay, and light signals are connected in parallel with the first relay the ator, the third (electromagnetic) relay and the second (electromagnetic) relay through the normally open contact of the third (electromagnetic) relay and the normally closed contact of the first relay, connected in series with each other and with the power source, while the light signal device is connected in parallel with the second (electromagnetic) relay and through a limit switch, the end of which is rigidly connected to the valve cover, a contactor is connected, and in parallel with the third (electromagnetic) relay, they are electrically connected through the contact of the sound contactor and Vetovo alarm.

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