CN2178294Y

CN2178294Y - Dewatering protector for submersible pump

Info

Publication number: CN2178294Y
Application number: CN 93232534
Authority: CN
Inventors: 林东山; 徐景伟; 李秉琪; 林仁山
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-15
Filing date: 1993-12-15
Publication date: 1994-09-28
Anticipated expiration: 2003-12-15

Abstract

The utility model discloses a dewatering protector for submersible pumps. The utility model is composed of a water level sensor 1, a signal processing circuit 2, an executive circuit 3 and a power supply circuit 4. After a resistor R [1] is connected with the water level sensor 1, one end of the resistor R [1] and the water level sensor 1 is connected with the positive electrode of the power supply, one end of the resistor R [1] and the water level sensor 1 is connected with the ground, and the common end of the resistor R [1] and the water level sensor 1 is connected with the input end of a three-terminal switch element. When the water level is below the set value, the signal processing circuit 2 outputs a control signal, the executive circuit 3 works, the working power supply of the electric motor of the submersible pump is cut off, and the utility model achieves the goal that the electric motor of the submersible pump is protected. The utility model has the advantages of simple structure, high reliability, convenient installation and operation, etc.

Description

Dewatering protector for submersible pump

The utility model belongs to a kind of submersible pump dehydration protection device of doing power with Ac.

Make the submersible pump of power with Ac, when water level is lower than submersible pump body, the submersible pump dehydrating operation.Owing to can not dispel the heat well, so motor for submerged pump in seconds can burn.So submersible pump is forbidden dehydrating operation.

The purpose of this utility model is to design a kind of when water level is lower than designated water level, can cut off the electronic type submersible pump dehydration protection device of submersible pump working power automatically.

For achieving the above object, take following technical solution: a level sensor 1 is set, this sensor is converted to electrical signal with water level signal, sends in the signal processing circuit of being made up of resistance R 1, trigistor and relay coil 2 and carries out signal processing.When water level was lower than setting value, control signal of signal processing circuit 2 outputs drove executive circuit 3 work, cuts off the electricity supply automatically.

In above-mentioned technical solution, trigistor can adopt field effect transistor, transistor, controllable silicon based semiconductor discrete device, also can adopt switch integrated circuit; Level sensor can adopt wet quick, photosensitive electron-like sensing element, also can adopt the double-metal sheet type mechanical pick-up device; For making signal processing circuit 2 energy proper functioning, the span of R1 should be between 0.5 Ω-100M Ω.

The utility model is owing to adopt electronic circuit, reliability height in the use, and in a single day water level is lower than setting value, and the submersible pump working power is cut off immediately; No matter highly versatile is single-phase family expenses submersible pump or three-phase industry submersible pump, and power kilowatt all can use from several hectowatts to tens.

Accompanying drawing and drawing explanation:

Accompanying drawing 1-electric functional-block diagram of the present utility model.

Accompanying drawing 2-embodiment's electrical schematic diagram of the present utility model.

Accompanying drawing 3-another embodiment's electrical schematic diagram of the present utility model.

In the accompanying drawings, 1-level sensor, 2-signal processing circuit, 3-executive circuit, 4-power circuit.

Below in conjunction with accompanying drawing the utility model is elaborated.

With reference to Fig. 1, Fig. 2.An embodiment of the present utility model is: bridge rectifier, filter capacitor C1 that transformer B, D1-D4 form form power circuit 4.The two ends of the primary air of B are connected on respectively on two phase lines of ac power supply, the secondary winding of B connects two input brachium pontis of bridge rectifier respectively, two of bridge rectifier output brachium pontis, ground connection, another is as the positive source output terminal, and C1 is attempted by between positive source and the ground.D1-D4 is the 1N4001 commutation diode, and C1 is the 100uF electrochemical capacitor.Level sensor 1 is that bimetallic strip is made.The coil of R1, field effect transistor, relay J is formed signal processing circuit 2.R1 one termination power positive pole, the other end also connect the grid of field effect transistor in addition by level sensor 1 ground connection, the source ground of field effect transistor, and drain electrode connects positive source by the coil of J.The resistance of R1 is 10M Ω, and field effect transistor adopts the 3DO series product, and J is a JL-6 type miniature electro-magnetic relay.The contact of relay J and motor for submerged pump are formed executive circuit 3.Every phase line of three-phase alternating-current supply is all received on the motor for submerged pump by the normally-closed contact of J.

With reference to Fig. 1, Fig. 3.Another embodiment's of the present utility model power circuit 4 is identical with first embodiment.Level sensor 1 is the humistor of a 10K Ω.The coil of resistance R 1, switch integrated circuit IC, relay J is formed signal processing circuit 2.One end ground connection of resistance R 1; The other end connects positive source by level sensor 1, also connects the signal input part of IC simultaneously.The grounding end ground connection of IC, power input connects positive source by the coil of relay J.The resistance of R1 is 100K Ω, and relay J is 4452 type sealed type electromagnetic relays, and switch integrated circuit IC has adopted CD series ungated integrated circuit.Executive circuit 3 has adopted normally opened contact with the contact that first embodiment's difference is a relay J.

Claims

1, a kind of submersible pump dehydration protection device; it is made up of level sensor 1, signal processing circuit 2, executive circuit 3 and power circuit 4; it is characterized in that: a termination power positive pole after resistance R 1 is connected with level sensor 1; one end ground connection; and the signal input part of its public termination trigistor; the grounding end ground connection of trigistor, power input connects positive source by the coil of relay J.

2, submersible pump dehydration protection device according to claim 1, it is characterized in that: said level sensor 1 can be humidity sensing element, photosensitive element, also can be that the bimetal pole plate is made.

3, submersible pump dehydration protection device according to claim 1 is characterized in that: said trigistor can be transistor, field effect transistor, controllable silicon based semiconductor discrete device, also can be switch integrated circuit.

4, submersible pump dehydration protection device according to claim 1, the Standard resistance range that it is characterized in that R1 is 0.5 Ω-100M Ω.