A safety operation protection device for circulating pump in heating system

Abstract

The utility model discloses a kind of safety operation protection devices for circulating pump in heating system, including temperature sensor, special wiring terminal, temperature controller, coil terminal, normally closed terminal, normally open terminal, push button switch, ac contactor and alarm;Temperature sensor is connected with temperature controller, the coil of normally closed terminal control ac contactor of temperature controller, normally open terminal controls alarm, three push button switches are respectively arranged in three independent circuits, special wiring terminal is equipped with redundancy terminal, the coil control loop of ac contactor is connected in series with thermal relay, alarm loop is connected in series with isolation diode and is connected in parallel with delay unit, and insulating isolation plate is arranged in control case;The device can realize multiple temperature protection, overload protection and reliable alarm of circulating pump motor, with the advantages of high electrical safety, strong anti-interference ability, perfect protection function.

Claims

1. A safety protection device for a circulating pump in a heating system, characterized in that, The system includes a temperature sensor (1), a dedicated terminal (2), a temperature controller (3), a coil terminal (31), a normally closed terminal (32), a normally open terminal (33), a push-button switch (4), an AC contactor (5), and an alarm (6). The temperature sensor (1) is connected to the temperature controller (3) via the dedicated terminal (2). The normally closed terminal (32) of the temperature controller (3) is connected to the coil terminal (31). The coil terminal (31) is electrically connected to the coil terminal of the AC contactor (5). The main contacts of the AC contactor (5) are connected in series with the power circuit of the circulating pump motor. The normally open terminal (33) of the AC contactor (5) is electrically connected to the alarm (6). There are three push-button switches, which are respectively located in circuit 1, circuit 2 between the normally closed terminal (32) and the AC contactor (5), and circuit 3 between the normally open terminal (33) and the alarm (6).

2. The safety protection device for a circulating pump in a heating system according to claim 1, characterized in that: The dedicated terminal (2) is equipped with dual parallel redundant terminals, one of which is used for temperature signal input and the other is used as a spare terminal.

3. A safety protection device for a circulating pump in a heating system according to claim 1, characterized in that: The temperature sensor (1) consists of four temperature probes, which are symmetrically installed around the casing of the circulating pump motor. The four temperature probes are connected to a dedicated terminal (2) via shielded wires.

4. A safety protection device for a circulating pump in a heating system according to claim 1, characterized in that: A thermal relay is connected in series in the coil control circuit of the AC contactor (5) to form a dual protection mechanism in conjunction with the temperature controller (3). When the current is overloaded, the power circuit of the circulating pump motor is cut off.

5. A safety protection device for a circulating pump in a heating system according to claim 1, characterized in that: The alarm (6) is an integrated sound and light alarm component. An isolation diode (7) is connected in series between the input terminal of the alarm (6) and the normally open terminal (33) of the AC contactor (5) to prevent the control circuit from interfering with the alarm circuit.

6. A safety protection device for a circulating pump in a heating system according to claim 1, characterized in that: A delay unit (8) is connected in parallel between the alarm (6) and the normally open terminal (33). The alarm (6) will only start after the temperature controller (3) has been activated for more than a set time, so as to prevent false alarms caused by instantaneous temperature fluctuations.

7. A safety protection device for a circulating pump in a heating system according to claim 1, characterized in that: The temperature controller (3), AC contactor (5) and alarm (6) are installed inside the control box. The inside of the box is equipped with an insulating isolation plate to separate the power circuit and signal circuit.

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