CN2343944Y - Electronic protector for preventing dryout - Google Patents
Electronic protector for preventing dryout Download PDFInfo
- Publication number
- CN2343944Y CN2343944Y CN 98242307 CN98242307U CN2343944Y CN 2343944 Y CN2343944 Y CN 2343944Y CN 98242307 CN98242307 CN 98242307 CN 98242307 U CN98242307 U CN 98242307U CN 2343944 Y CN2343944 Y CN 2343944Y
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- CN
- China
- Prior art keywords
- relay
- circuit
- power supply
- triode
- supply circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides an electronic protector for preventing dryout, mainly composed of a relay, a DC power supply circuit and a control circuit, wherein, the control circuit is composed of a relay, a detector and a transistor switch circuit which comprises a triode, a capacitor and a resistor, the switch circuit is connected with the both ends of the DC power supply circuit, a grounding detector and a liquid level detector are connected respectively with the both ends of a capacitor in the switch circuit, the relay and the capacitor are connected in parallel with a part between the front end of the DC power supply circuit and the collector of the triode, and the contact switch of the relay is connected in series with the electric heating element of an electric heater. The utility model has the advantages that the utility model can protect a liquid electric heater effectively, extend the service life of the electric heater and save energy.
Description
The utility model relates to a kind of electronic protector, especially for electric liquid-heating appliance in case its dry combustion method and the electronic protector that damages.
At present, no matter existing electric liquid-heating appliance is industry, medical, or the product for civilian use.Its anti-dry protector is mechanical temperature-control formula or external Temperature Control Type.Its temperature sensor of mechanical temperature-control formula is a bimetal leaf, because the relation of its structure, its temperature control can not be accomplished very accurate, and the boiling point of heated liquid is relevant with factors such as atmospheric pressure, height above sea levels again, is tangible weak point so control anti-dry with boiling point.In addition, no matter be the mechanical temperature-control formula, or external Temperature Control Type, its guard method all is after waiting the liquid evaporation.Rely on the self-heating of heating, make the temperature controller action, and cut off the electricity supply, and after treating the heating cooling, heat again, influence the service life of heater, waste energy.
The purpose of this utility model is that the liquid level that provides a kind of dependence to be heated liquid protects the electronic type anti-dry protector of electric heater unit, to overcome the deficiencies in the prior art part.
Technical solution of the present utility model is: it mainly is made up of relay, DC power supply circuit and control circuit; Above-mentioned control circuit by relay, pop one's head in and the transistor switching circuit that contains triode, electric capacity, resistance constitutes; On-off circuit is connected to the two ends of DC power supply circuit, and the electric capacity two ends in the said switching circuit are connected to grounded probe and liquid-level probe respectively; Relay and an electric capacity are connected between the colelctor electrode of the anode of DC power supply circuit and triode; Connect AC power after the electrical heating elements of the contact switch of relay and electric heater unit is in series.
The half-wave rectifying circuit of above-mentioned dc power electric routing transformer and the commutation diode that contains, filter capacitor constitutes, the 220V alternating current is after the transformer step-down, the positive pole of one terminating diode of transformer, the negative pole of diode connects the positive pole of electric capacity, and the negative pole of electric capacity connects the other end of transformer.
The base stage of the triode of said switching circuit and emitter stage are connected to the negative terminal of DC power supply circuit, the i.e. negative pole of filter capacitor respectively behind a resistance; The base stage of triode behind resistance and electric capacity, is connected to the positive pole of DC power supply circuit again, i.e. the negative pole of diode.
The utility model compared with prior art has: be evaporated to liquid-level probe when following when being heated liquid; electrical heating elements no longer heats; thereby prolong the service life of electric heater, and energy savings, the anti-dry that is particularly suitable for electric kettle, electric heater is protected.
Description of drawings: accompanying drawing is the utility model electrical schematic diagram.
The utility model is described in further detail below in conjunction with accompanying drawing:
The utility model mainly is made up of relay J, DC power supply circuit and control circuit; Above-mentioned dc power electric routing transformer L and the half-wave rectifying circuit that contains commutation diode VD, filter capacitor C1 constitute, the 220V alternating current is after transformer L step-down, the positive pole of the terminating diode VD of transformer L, the negative pole of diode VD connects the positive pole of capacitor C 1, and the negative pole of capacitor C 1 connects the other end of transformer L.Above-mentioned control circuit is made of relay J, probe T1, T2 and the transistor switching circuit that contains triode VT, capacitor C 2, C3, resistance R 1, R2, R3; The base stage of triode VT and emitter stage are respectively behind negative bias resistance R 2 and current limliting R3 and connect the negative terminal of dried DC power supply circuit, the i.e. negative pole of filter capacitor C1; The base stage of triode VT behind a current-limiting resistance R1 and ceramic disc capacitor C3, is connected to the positive pole of DC power supply circuit, i.e. the negative pole of diode VD again.Capacitor C 3 two ends are connected to grounded probe T1 and liquid-level probe T2 respectively; A relay J and a protection capacitor C 2 are connected between the colelctor electrode of the anode (negative pole of diode VD) of DC power supply circuit and triode VT; 2 of capacitor C are protected triode VT and are made the relay J time-lag action; With the be in series input of back incoming transport electricity of the electrical heating elements R of the contact switch J of relay J and electric heater unit.The purpose of above-mentioned halfwave rectifier is to have enough voltage to make the relay J adhesive when zero load; And voltage descends to reduce the loss of contactor and triode VT self after adhesive.
During work, at first liquid-level probe T2 is placed heated liquid, grounded probe T1 is born by the earth connection of electric heater unit.The 220V alternating current is depressurized to 12V through transformer L, through the half-wave rectifying circuit that diode VD, filter capacitor C1 constitute, becomes direct current to use for control circuit.When liquid-level probe T2 contacts with liquid, form resistance between liquid-level probe T2 and the grounded probe T1, the relay J adhesive, and make relay contact switch J closure, the electrical heating elements R of electric heater gets electric work.When the evaporation of heated liquid, and the liquid level that makes liquid becomes open circuit between liquid-level probe T2 and the grounded probe T2 when liquid-level probe T2 is following, and relay J is released, and makes relay J contact switch J disconnect, and heating R quits work.The effect of capacitor C 2 is the inverse peak voltages when absorbing relay J release, and VT is not breakdown with the protection triode; Surge during simultaneously, owing to liquid boiling may make relay J produce shake.And capacitor C 2 absorbs the shake that surge produced, and plays the delay protection effect.
Claims (3)
1. anti-dry electronic protector, it mainly is made up of relay, DC power supply circuit and control circuit; It is characterized in that above-mentioned control circuit by relay, pop one's head in and the transistor switching circuit that contains triode, electric capacity, resistance constitutes; On-off circuit is connected to the two ends of DC power supply circuit, and the electric capacity two ends in the said switching circuit are connected to grounded probe and liquid-level probe respectively; Relay and an electric capacity are connected between the colelctor electrode of the anode of DC power supply circuit and triode; Connect AC power after the electrical heating elements of the contact switch of relay and electric heater unit is in series.
2. a kind of anti-dry electronic protector according to claim 1; the half-wave rectifying circuit that it is characterized in that above-mentioned dc power electric routing transformer and the commutation diode that contains, filter capacitor constitutes; the 220V alternating current after the transformer step-down, the positive pole of a terminating diode of transformer.The negative pole of diode connects the positive pole of electric capacity, and the negative pole of electric capacity connects the other end of transformer.
3. a kind of anti-dry electronic protector according to claim 1 and 2 is characterized in that base stage and emitter stage is connected to DC power supply circuit respectively behind a resistance negative terminal, the i.e. negative pole of filter capacitor of the triode of said switching circuit; The base stage of triode behind resistance and electric capacity, is connected to the positive pole of DC power supply circuit again, i.e. the negative pole of diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98242307 CN2343944Y (en) | 1998-10-01 | 1998-10-01 | Electronic protector for preventing dryout |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98242307 CN2343944Y (en) | 1998-10-01 | 1998-10-01 | Electronic protector for preventing dryout |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2343944Y true CN2343944Y (en) | 1999-10-20 |
Family
ID=33988896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98242307 Expired - Fee Related CN2343944Y (en) | 1998-10-01 | 1998-10-01 | Electronic protector for preventing dryout |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2343944Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613652A (en) * | 2015-01-12 | 2015-05-13 | 国家电网公司 | Control circuit of domestic floor heating gas-fired boiler |
-
1998
- 1998-10-01 CN CN 98242307 patent/CN2343944Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613652A (en) * | 2015-01-12 | 2015-05-13 | 国家电网公司 | Control circuit of domestic floor heating gas-fired boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |