CN103187706B - Electrical water heater electric is pressed detection type earth leakage protective device - Google Patents

Electrical water heater electric is pressed detection type earth leakage protective device Download PDF

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Publication number
CN103187706B
CN103187706B CN201110445751.0A CN201110445751A CN103187706B CN 103187706 B CN103187706 B CN 103187706B CN 201110445751 A CN201110445751 A CN 201110445751A CN 103187706 B CN103187706 B CN 103187706B
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CN
China
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described
electric
detection circuit
leakage
zero line
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CN201110445751.0A
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Chinese (zh)
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CN103187706A (en
Inventor
廖金柱
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樱花卫厨(中国)股份有限公司
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Abstract

The invention discloses a kind of electrical water heater electric and press detection type earth leakage protective device, comprise master switch, leakage current mutual inductor, electric-leakage detection circuit, photo-coupler, threshold voltage detection circuit, protection executive circuit and mechanical release/attracting device, master switch comprise respectively fire, zero, wiretap; Electric-leakage detection circuit and protection executive circuit are electrically connected on respectively between fire, ground wire; Leakage current mutual inductor detects the leakage current on fire, zero line and delivers a letter to electric-leakage detection circuit; The neon tube of photoelectrical coupler is electrically connected on zero, between ground wire and detect its threshold value pressure reduction, the photo resistance of photoelectrical coupler is electrically connected on threshold voltage detection circuit; Electric-leakage detection circuit and threshold voltage detection circuit are messaging in respectively protection executive circuit, and protection executive circuit control machinery release/attracting device is to control the switching of master switch. This voltage detecting type earth leakage protective device is not only simple in structure, easy to use, and reliability is high, saves lot of materials cost simultaneously.

Description

Electrical water heater electric is pressed detection type earth leakage protective device

Technical field

The present invention relates to a kind of electrical water heater electric and press detection type earth leakage protective device, outstandingIt relates to a kind of voltage detecting type earth leakage protective device of storage-type electric water heater.

Background technology

Earth leakage protective device on existing market all adopts current detection type earth leakage protective dressPut, it is except realizing live wire, zero line to earth loop electric current > when 5mA, realizeOutside the cutting function of power supply and load, also live wire can be realized and neutral line current reachesWhen 30mA, 0.1s is interior to power supply and load cutting function, but its loop is electric currentDetection type earth leakage protective device, cannot the 100% guarantee user person and property peaceEntirely. In addition, current detection type earth leakage protective device mainly contains following shortcoming and cannot overcome:

1. national power utilization environment has two kinds, i.e. protective ground and protectiveness connecting to neutral, nothingWhich kind of connection is opinion adopt, and socket ground wire and zero line loop voltage be some voltage all,This voltage is objective reality, and GB GB_20044-2005 regulation electric attachments manWith with the not portable residual current device (PRCD) with overcurrent protection of similar applicationsWhen middle loop current reaches 30mA, must to power supply and load is mandatory in 0.1s cutDisconnected function, and earth resistance is generally all less than 0.1 Ω, that is to say Compulsory FeatureGround wire and zero line loop voltage are necessary for 30mA*0.1 Ω=0.001V, and socket ground wireAll there is certain voltage poor with zero line loop voltage, in fact different systems electric power system oneAs have the voltage below 10V, this voltage is objective reality, now zero line and ground wireLoop current must be greater than 30mA, and current detection type three lines leak to protect and must disconnect electricity soSource, make its not deenergization, must make inner container of electric water heater and wall and water pipe returnInsulate (generally adopting the red blue water pipe head of plastics and inner container insulating hanger) done on road, makesObtain ground wire and zero line loop current and be less than 30mA, reach earth leakage protective device not with thisAs for false tripping, avoid impact to use, but be to have promoted E-N socket voltage relatively, generalNot false tripping voltage maintain 64V above very person reach 90V, the serious threat of this voltageTo personal safety;

2. connect the red blue water pipe head of plastics to increase at storage-type electric water heater outputLarge water resistance reduces ground wire and zero line loop current, also will increase electric heater inside simultaneouslyInner bag and casing insulation device, this will consume a large amount of costs;

3. increase the inner inner bag of electric heater and the existing Patents of casing insulation deviceRestriction cause the situation of seal exclusive supply, be unfavorable for the development of enterprise.

And can solve as above problem without any an enterprise at present, cause enterprise to faceBe unfavorable for the situation of self-development.

Summary of the invention

In order to overcome above-mentioned defect, the invention provides a kind of electrical water heater electric and press inspectionSurvey type earth leakage protective device, this not only structure letter of voltage detecting type earth leakage protective deviceSingle, easy to use, and reliability is high, saves lot of materials cost simultaneously.

The present invention for the technical scheme that solves its technical problem and adopt is: Yi Zhong electricityVoltage detecting type earth leakage protective device for water heater, comprises master switch, leakage current mutual inductanceCoil, electric-leakage detection circuit, photo-coupler, threshold voltage detection circuit, protection are heldRow circuit and mechanical release/attracting device, described master switch comprise be located at respectively live wire,Live wire switch, zero line switch and ground wiretap on the output of zero line and ground wire; InstituteState electric-leakage detection circuit and protection executive circuit be electrically connected on respectively live wire and zero line itBetween; Described leakage current mutual inductor detects leakage current on described live wire and zero line alsoDeliver a letter to electric-leakage detection circuit; The neon tube of described photoelectrical coupler is electrically connected on described zeroBetween line and ground wire and detect the threshold value pressure reduction between zero line and ground wire, described photoelectricity couplingThe photo resistance of closing device is electrically connected on described threshold voltage detection circuit; Described electric leakage inspectionSlowdown monitoring circuit and threshold voltage detection circuit are messaging in respectively described protection executive circuit, instituteStating described in protection executive circuit control machinery release/attracting device describedly always opens to controlThe switching of closing. When work, leakage current mutual inductor detects the electric leakage on live wire and zero lineElectric current is also transferred to electric-leakage detection circuit, and electric-leakage detection circuit produces a high level signalAnd export to protection executive circuit, controlled silicon conducting make electromagnetism in protection executive circuitCoil moment adhesive makes machinery release/attracting device remove self-locking, disconnects master switch,Thereby power supply and load are disconnected completely; In like manner, the neon tube of photoelectrical coupler detects zeroThreshold value pressure reduction between line and ground wire, in the time there is threshold value pressure reduction between zero line and ground wire, neonManage luminously, the photo resistance resistance of photo-coupler inside reduces, and threshold voltage is detectedCircuit output high level signal is also transferred to protection executive circuit, in protection executive circuitControlled silicon conducting also makes solenoid moment adhesive that machinery release/attracting device is removedSelf-locking, disconnects master switch, thereby power supply and load are disconnected completely.

As a further improvement on the present invention, at one of the neon tube of described photoelectrical couplerBetween end and zero line, be connected in series respectively the first resistance and the second resistance.

As a further improvement on the present invention, the resistance of described the first resistance and the second resistanceBe worth identically, be 10M ohm, power 0.25W.

As a further improvement on the present invention, arbitrary to ground wire in described live wire and zero lineLoop current while being greater than 5mA, described electric leakage mutual inductor will be exported induced electromotive forceSignal is to electric-leakage detection circuit, and electric-leakage detection circuit is received this signal output high level letterNumber give protection executive circuit.

As a further improvement on the present invention, the electromotive force pressure reduction of described ground wire and zero line is greater thanWhen 50V, described threshold voltage detection circuit output high level signal carries out electricity to protectionRoad.

As a further improvement on the present invention, described machinery release/attracting device is normalUnder state, in self-locking state, described protection executive circuit receives after high level signalTo make its inner controlled silicon conducting, and by solenoid moment make machinery discharge/Attracting device is removed self-locking port master switch.

The invention has the beneficial effects as follows:

1. any one end of live wire and zero line is to earth loop electric current > when 5mA, this deviceSequence is cut off respectively live wire-zero line (synchronously), ground wire on time, reaches and cuts off the electricity supplyWith load;

2., when ground wire and zero line loop voltage exceed 50V, this device on time sequence dividesDo not cut off live wire-zero line (synchronously), E, reach and cut off the electricity supply and load;

3. in socket when live wire and N error-polarity connection of power supply, having under ground wire prerequisite, thisDevice on time sequence cuts off respectively live wire-zero line (synchronously), ground wire, reaches cut-outPower supply and load;

4. storage-type electric water heater internal body inner bag without with casing insulation, thereby jointAbout lot of materials cost;

5. storage-type electric water heater cold water input and output end of hot water are without connecing red indigo plantJoint, thus lot of materials cost also can be saved;

6. thoroughly overcome the earth leakage protective device false tripping of zero line/ground line current detection typeProblem;

7. thoroughly avoided the restricted problem of collets patent.

Brief description of the drawings

Fig. 1 is structural principle schematic diagram of the present invention.

Detailed description of the invention

A kind of electrical water heater electric is pressed detection type earth leakage protective device, comprises master switchK, leakage current mutual inductor 1, electric-leakage detection circuit 2, photo-coupler 3, threshold value electricityPress testing circuit 4, protection executive circuit 5 and machinery release/attracting device 6, described inMaster switch comprises the fire on the output of being located at respectively live wire L, zero line N and ground wire EWiretap, zero line switch and ground wiretap; Described electric-leakage detection circuit and protection are carried outCircuit is electrically connected on respectively between live wire and zero line; Described leakage current mutual inductor detectsLeakage current on described live wire and zero line is also delivered a letter to electric-leakage detection circuit; Described lightThe neon tube RG of electric coupler is electrically connected between described zero line and ground wire and detects zero lineAnd threshold value pressure reduction between ground wire, the photo resistance RT of described photoelectrical coupler is electrically connectedBe connected to described threshold voltage detection circuit; Described electric-leakage detection circuit and threshold voltage inspectionSlowdown monitoring circuit is messaging in respectively described protection executive circuit, the control of described protection executive circuitDescribed machinery release/attracting device is to control the switching of described master switch. When work,Leakage current mutual inductor detects the leakage current on live wire and zero line and is transferred to electric leakageTesting circuit, electric-leakage detection circuit produces a high level signal and exports to protection and carry outCircuit, controlled silicon conducting make solenoid moment adhesive make machine in protection executive circuitTool release/attracting device is removed self-locking, disconnects master switch, thereby makes power supply and negativeCarry completely and disconnect; In like manner, the neon tube of photoelectrical coupler detects the threshold between zero line and ground wireValue pressure reduction, in the time there is threshold value pressure reduction between zero line and ground wire, neon tube is luminous, optically-coupledThe photo resistance resistance of device inside reduces, and makes threshold voltage detection circuit output high levelSignal is also transferred to protection executive circuit, controlled silicon conducting making in protection executive circuitSolenoid moment adhesive makes machinery release/attracting device remove self-locking, disconnects totalSwitch, thus power supply and load are disconnected completely.

Preferably, between one end of the neon tube of the above photoelectrical coupler and zero line pointBe not connected in series the first resistance R 1 and the second resistance R 2.

Preferably, above-mentioned the first resistance is identical with the resistance of the second resistance, is 10MOhm, power 0.25W.

Preferably, in above-mentioned live wire and zero line, arbitrary loop current to ground wire is greater thanWhen 5mA, described electric leakage mutual inductor will be exported induced electromotive force signal to detection of electrical leakageCircuit, electric-leakage detection circuit receives that this signal output high level signal is to protection execution electricityRoad.

Preferably, when the electromotive force pressure reduction of above-mentioned ground wire and zero line is greater than 50V, described inThreshold voltage detection circuit output high level signal is given protection executive circuit.

Preferably, under above-mentioned machinery release/attracting device normal condition in self-locking shapeState, described protection executive circuit will make the controlled of its inside after receiving high level signalSilicon conducting, and make machinery releases/attracting device releasing self-locking by solenoid momentAnd port master switch.

Claims (2)

1. electrical water heater electric is pressed a detection type earth leakage protective device, and its feature existsIn: it comprises master switch (K), leakage current mutual inductor (1), electric-leakage detection circuit(2), electricity is carried out in photoelectrical coupler (3), threshold voltage detection circuit (4), protectionRoad (5) and machinery release/attracting device (6), described master switch comprises to be respectively located atLive wire switch, zero on the output of live wire (L), zero line (N) and ground wire (E)Wiretap and ground wiretap; Described electric-leakage detection circuit and protection executive circuit electricity respectivelyBe connected between live wire and zero line; Described leakage current mutual inductor detect described live wire andLeakage current on zero line is also delivered a letter to electric-leakage detection circuit; Described photoelectrical couplerNeon tube (RG) be electrically connected between described zero line and ground wire and detect zero line and ground wire itBetween threshold value pressure reduction, the photo resistance (RT) of described photoelectrical coupler is electrically connected on instituteState threshold voltage detection circuit; Described electric-leakage detection circuit and threshold voltage detection circuitBe messaging in respectively described protection executive circuit, machine described in the control of described protection executive circuitTool release/attracting device is to control the switching of described master switch; At described photoelectric couplingBetween one end of the neon tube of device and zero line, be connected in series respectively the first resistance (R1) and the second electricityResistance (R2); In described live wire and zero line, arbitrary loop current to ground wire is greater than 5mATime, described leakage current mutual inductor will be exported induced electromotive force signal to detection of electrical leakage electricityRoad, electric-leakage detection circuit receives that this signal output high level signal is to protection execution electricityRoad; When the electromotive force pressure reduction of described ground wire and zero line is greater than 50V, described threshold voltageTesting circuit output high level signal is given protection executive circuit; Described machinery discharges/inhalesUnder locking device normal condition, in self-locking state, described protection executive circuit receives heightAfter level signal, will make its inner controlled silicon conducting, and make by solenoid momentMachinery release/attracting device is removed self-locking port master switch.
2. electrical water heater electric according to claim 1 presses the electric leakage of detection type to protectProtection unit, is characterized in that: described the first resistance is identical with the resistance of the second resistance,Be 10M ohm, power 0.25W.
CN201110445751.0A 2011-12-28 2011-12-28 Electrical water heater electric is pressed detection type earth leakage protective device CN103187706B (en)

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Application Number Priority Date Filing Date Title
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CN103187706B true CN103187706B (en) 2016-05-11

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CN104201648A (en) * 2014-09-15 2014-12-10 福建通用同溢电气有限公司 New distribution connection method and device
CN104734114B (en) * 2015-02-25 2017-11-03 余姚市嘉荣电子电器有限公司 The abnormal earth leakage protective device of optocoupler detection ground wire voltage
CN106322767B (en) * 2015-06-23 2019-11-05 青岛经济技术开发区海尔热水器有限公司 A kind of electric heater and control method
CN106602500A (en) * 2017-01-04 2017-04-26 郝珊 Novel protection grounding live-line alarm and protection circuit
CN107017603B (en) * 2017-03-10 2020-02-21 浙江工商职业技术学院 Intelligent grounding protection device and control method thereof

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