CN2279727Y

CN2279727Y - Protective switch for submersible pump

Info

Publication number: CN2279727Y
Application number: CN 97203905
Authority: CN
Inventors: 邬安平
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-02
Filing date: 1997-01-02
Publication date: 1998-04-22
Anticipated expiration: 2007-01-02

Abstract

The utility model relates to a protective switch for a submersible pump, which comprises a circuit interrupting device which is composed of a relay. The utility model is characterized in that the utility model also comprises a switch tube which is connected with the circuit interrupting device in series, wherein, a base electrode of the switch tube is connected with the inner part of a motor of the submersible pump via a water-leakage detecting line. The utility model has the advantages of simple circuit structure and reliable work; with the device of the utility model, the phenomenon that the motor is burned out caused by that the submersible pump has water leakage can be basically stopped.

Description

The immersible pump protection switch

A kind of immersible pump protection switch relates to and ends the automatic disconnection protective device that normal electric work situation directly reacts to departing from.

Immersible pump is worked owing to immerse in the water as the water lift equipment of electromechanics unification, though require very high manufacturer to take relative measures on mechanical technique to its sealing property.But along with the prolongation of service time, encapsulant will wear and tear, and forms very high pressure when adding pump working in spiral case, and water will be in rotating shaft penetrates into motor and cause burn-down of electric motor.Present domestic immersible pump year output partly is equipped with at the large diving pump of 7,500,000 left and right sides power more than 7500W and leaks, phase shortage, overload protection switch.Leak to detect and adopt double wire system; specially joined on the motor and leaked and the overload detection cable; and the switch-box volume is very big; cost an arm and a leg; and the following immersible pump of power 7500W is not all joined the protection switch that leaks; have only phase shortage and overload protection function, powerless to drainage, and the motor that burns out because of leaking will account for more than 90%.

The purpose of utility model provides a kind of immersible pump protection switch, and it can detect the motor situation of leaking, and can cut off the electricity supply.

According to above-mentioned purpose; utility model adopts such technical scheme: this immersible pump protection switch includes a tripper that is made of relay; be characterized in also including the switching tube that is connected in series mutually with tripper, the base stage of described switching tube is connected on the inside of motor for submerged pump by water leakage detection line.

When motor leaked, water level raise gradually, in case run into the water leakage detection line of motor internal, will pass through water, immersible pump casing and the earth UNICOM, thereby made the switching tube conducting in the base stage generation control signal of switching tube,

The utlity model has that circuit structure is simple, the characteristics of reliable operation, use this device can stop the phenomenon of leaking motor is burnt out substantially owing to immersible pump.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

The immersible pump protection switch circuit theory diagrams that Fig. 1 the utility model proposes for foundation.

The immersible pump protection switch that Fig. 2 the utility model proposes for foundation increases the circuit theory diagrams behind the lack detection circuit.

The circuit theory diagrams of Fig. 3 under the single-phase electricity situation, using according to the immersible pump protection switch that the utility model proposes.

Below in conjunction with drawings and Examples the immersible pump protection switch that foundation the utility model proposes is further described.

As shown in Figure 1, adopt line voltage direct feeding system in the present embodiment.Alternating current is through diode D ₁Rectification becomes Rectified alternating current, and as the working power of this circuit.Relay J ₁With J ₂Be connected on power supply and triode BG after the serial connection mutually ₁Collector electrode between, and J ₁With J ₂Normally-closed contact then be connected in the current supply circuit of motor.Triode BG ₁Emitter connect power supply, base stage is through diode D ₂And resistance R ₂After connect water leakage detection line (1) capacitor C ₁Be attempted by J ₁And J ₂Two ends, be used for J ₁And J ₂Carry out energy supplement.Relay J ₂Normally opened contact be connected on triode BG ₁Emitter and collector between, be used for the self-insurance of relay.Water leakage detection line then is connected on the inside of motor for submerged pump.

When water leakage detection line does not touch water, switching tube BG ₁Base stage unsettled and end.Relay J ₁, J ₂No current is by keeping inactive state.The normally-closed contact of relay is connected the power supply of motor, and the motor operate as normal is when motor leaks, and in a single day the water surface touches water leakage detection line, at switching tube BG ₁Base stage alternating voltage is just arranged, this voltage is detected diode D ₂After the rectification, become the pulsating voltage of forward, make BG ₁Conducting.Thus, relay work, the power supply of motor has been cut off in its normally-closed contact tripping.Meanwhile, relay J ₂Normally opened contact close platform, short circuit switching tube, make the relay self-insurance

Fig. 2 is three-phase immersible pump protection switch circuit theory diagrams open in usual.Rectifying part, relay switch part and the test section that leaks are similar with the circuit among Fig. 1 in this circuit.Phase-lacking protective unit and overload protection unit have been increased in the present embodiment newly.Operating state and Fig. 1 of relay are different, and Fig. 2 repeat circuit is with output open in usual.By resistance R ₄, capacitor C ₄, voltage-stabiliser tube WD ₁Form a simple stabilized voltage power supply.At a point, the one tunnel meets switching tube BG behind the phase shortage detecting unit ₃Base stage, another road meets BG through delay unit ₃Base stage.Water leakage detection line (1) is then through triode BG ₂After meet switching tube BG ₃, BG wherein ₂Collector electrode meet BG ₃Base stage, emitter meets BG ₃Emitter, base stage connects water leakage detection line.The phase shortage detecting unit is composed in series by three identical parts.Every part is by triode BG ₆, current transformer C ', resistance R J, capacitor C J, diode DJ constitute.Current transformer is enclosed within the supply line of motor, its pair edge joint three suction pipe BG ₆Base stage.DJ and C ' pay a limit be connected in series after same again RJ, CJ and connect.Delay circuit is by WD ₂, R ₆, C ₃Constitute, wherein R ₆With C ₃After the serial connection again with WD ₂Join.Preferably connect a thermoswitch (2) on water leakage detection line again, this switch of other end ground connection of described thermoswitch is inlaid in the motor coil, in case the motor overload heating, the thermoswitch closure.

When certain former thereby phase shortage of arbitrary phase factor in the three-phase circuit, just there is not induced voltage to produce in current transformer A ', B ', the C ' secondary side coil and the detection transistor of this phase current mutual inductor pairing will be ended because of lacking bias voltage.Switching tube BG ₅End owing to can not get the base stage bias current, relay discharges, and external circuit cuts off.

As the detection transistor BG that leaks ₂Base stage in ground signalling when input, BG, arranged ₂Conducting is to switching tube BG ₃Base loop play the stream effect of cutting out.BG ₃The bias current face of losing cutoff relay discharges, and the motor main circuit cuts off, the life of cutting down output of three equal influence electricities of current transformer.

To the situation of single-phase electricity, circuit theory diagrams are referring to Fig. 3.Voltage-stabiliser tube WD ₃With capacitor C ₅And after connecing again with resistance R ₉Join.Resistance R ₁₀One terminating resistor R ₉, another terminating diode D ₇, triode BG ₇Emitter meet R ₉With R ₀Contact, base stage meets R ₁₀With D ₇Contact.D ₇Through R ₁₁Connect water leakage detection line (1).BG ₇Collector electrode through diode D ₈After meet switching tube BG ₈Base stage.Simultaneously, voltage-stabiliser tube WD ₄With resistance R ₁₂After the serial connection, be connected on BG ₇Collector electrode and D ₇Between the negative terminal.

When a end is phase line, by R ₉, WD ₃, C ₅On the stabilized voltage power supply of forming the earth is positive polarity.This moment, the electric energy on the power supply just passed through R if water leakage detection line has been run into water ₁₀, D ₇, R ₁₁, water leakage detection line, water, casing, the earth constitute the loop and discharge this electric current at R ₁₀Last formation pressure drop is BG ₇Provide bias voltage, BG ₇Conducting.Power supply also passes through BG when detecting loop power supply ₇Emitter and collector to switching tube BG ₈Base stage power supply.Switch BG ₈Because of the base current saturation conduction is arranged.Relay J ₆, J ₇Adhesive and self-locking.Because the relay of this circuit is exported with normally closed form, in case the power supply of motor for submerged pump has just been cut off in adhesive.

When b end during, in case have the alternating voltage detection line to run into water between b end and the earth, this voltage will be introduced in the base loop of switching tube, through diode D for phase line ₈Halfwave rectifier, resistance R ₁₁, R ₁₂Current limliting, the negative sense pulsating current is by switching tube BG ₈Base stage, make the switching tube saturation conduction.The relay adhesive is also cut off the current supply circuit of motor.

Claims

1. an immersible pump protection switch includes a tripper that is made of relay, it is characterized in that also including the switching tube that is connected in series mutually with described tripper, and the base stage of switching tube is connected on the inside of motor for submerged pump by water leakage detection line.

2. immersible pump protection switch according to claim 1 is characterized in that also including stabilized voltage power supply.

3. as immersible pump protection switch as described in the claim 2, it is characterized in that stabilized voltage power supply one tunnel connects the switching tube base stage through the phase shortage detecting unit, the one tunnel connects the switching tube base stage through delay unit.

4. immersible pump protection switch according to claim 1 is characterized in that being connected to thermoswitch on the water leakage detection line, and the other end ground connection of thermoswitch.