CN2368249Y

CN2368249Y - Energy-saving liquid electric heater

Info

Publication number: CN2368249Y
Application number: CN 99208309
Authority: CN
Inventors: 骆华; 刘文起
Original assignee: Tianjin Xinmei Real Estate Co Ltd
Current assignee: Tianjin Xinmei Real Estate Co Ltd
Priority date: 1999-04-20
Filing date: 1999-04-20
Publication date: 2000-03-08
Anticipated expiration: 2009-04-20

Abstract

The utility model relates to an energy-saving liquid electric heater, which is characterized in that the structure of a resonance power supply circuit of the heater comprises an input circuit, a bridge frequency conversion circuit, an LC resonance circuit, a driving circuit and an over-current and over-temperature protection circuit. The utility model has the advantages that the operation of the power supply of the heater is stable; the instant boosting caused by thunderbolt, the interference of high order harmonics to an electrical network, the over current and the over temperature can be prevented. The utility model provides a safe electric heater. Compared with a structure which directly carries out heating to liquid, the heating efficiency of the heater for the liquid is improved by 60%, and the energy is saved by 30%. The energy-saving liquid electric heater is an energy-saving product which is supposed to be greatly promoted in society.

Description

The energy-saving liquid electric heater

The utility model relates to a kind of energy-saving liquid electric heater, particularly adopts way of electromagnetic induction to liquid heat.

Can divide two kinds to the electrically heated device of liquid at present, a kind of is the metallic conductor energising to be placed in the liquid liquid is directly heated; The another kind of induction mode that adopts is to liquid heat, and its principle is to utilize the outside magnetic field that changes by the electromagnetism conduction, goes up at inductor (claiming heater again) and produces the heat that the eddy current effect conversion produces, and liquid is heated.There is following defective in the circuit of the power unit of known induction heater: the electrical network high voltage transient is not suppressed in (1) circuit; (2) lack the high-frequency noise that safeguard measures such as overcurrent, overtemperature, (3) resonant circuit produce in the circuit electrical network is had severe contamination.

The purpose of this utility model is to overcome the deficiency of above-mentioned technology, and a kind of liquid electric heater that improves power circuit is provided, it can prevent the power supply high frequency to electric network pollution, anti-overflow, anti-overtemperature, anti-electrical network high voltage transient to strengthen the circuit of power work stability.

The purpose of this utility model solves by following scheme:

A kind of energy-saving liquid electric heater is mainly by dress heater 12 in a resonant power and; the container 14 of its outer carry fluid 13 is formed, it is characterized in that the resonant power circuit structure be power supply successively the common mode inhibition filter circuit 2 formed at the voltage protection circuit of forming by pressure cell 1, by electric capacity, coil of series connection, the bridge rectifier 3 that is constituted by a diode, by capacitor C ₇, C ₈The linear filtering circuit of forming 4, by four IGBT insulated gate electrodes double-click full-bridge frequency-conversion circuit 5 that transistor npn npns form, by capacitor C ₉Summation current transformer 10, carrying object 13 series connection backs are formed resonant circuit and are connected on frequency changer emitter node J ₁, J ₂On, four output terminals A of the driver of forming by integrated package 6 ', B ', C ' D ' be connected on four gate terminal A, B, C, the D of frequency changer, three inputs of driver link with room temperature control circuit 7, current foldback circuit 8, overtemperature prote circuit 9 respectively, wherein the input E of current foldback circuit and current transformer 10 link, and the input F of overtemperature prote circuit 9 and the thermistor 11 on the heater 12 link; The accessory power supply 16 of connecting between power supply and driver 6 in addition, this accessory power supply is the Industrial Frequency Transformer T by mutual series connection ₅, diode BD ₂Bridge rectifier, capacitor C ₁₀Form.

The utility model has the advantages that:

1, there are voltage protection circuit and common mode inhibition filter circuit can prevent that thunder and lightning from raise voltage instantaneous in the circuit and prevent that high order harmonic component is to Disturbance in Power Net.

2, in the circuit accessory power supply is arranged, this accessory power supply and driver and room temperature protective circuit, overtemperature prote circuit, current foldback circuit link, and can make circuit working be in a stable state like this.

3, carrying object adopts tubing particularly the non-ferrous metal ring is equipped with at copper pipe and heater two ends, can reach the purpose of not only saving material but also improving the heat efficiency, the utility model efficiency of heating surface is placed on liquid than the metallic conductor energising and directly heats raising 60%, economize on electricity 30% is to advocate the energy-conserving product that uses in the society energetically.

Description of drawings:

Fig. 1 is the structural representation of the utility model resonant power circuit.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:

The utility model is mainly by dress heater 12 in a resonant power and, the container 14 of its outside carry fluid 13 is formed, heater 12 can be processed into corrugated stack back with non-ferrous metal such as stainless sheet steel to be formed, a non-ferrous metal ring (as copper ring) is overlapped at the heater two ends respectively, carrying object can be lead or copper pipe, carrying object places the container double wall, and this container can be nonmetal as plastics; It also can be non-ferrous metal.

The structure of resonant power circuit is: the 220V high voltage source successively series connection at the anti-lightning strike voltage protection circuit of forming by pressure-sensitive U 1, by capacitor C ₁To C ₆With coil L ₁The common mode inhibition filter circuit of forming, by diode BD ₁, form bridge rectifier 3, by the electrochemical capacitor C of two parallel connections ₇, C ₈The linear filtering circuit of forming 4, by four IGBT insulated gate electrode double-click type crystal T ₁, T ₂, T ₃, T ₄The full-bridge frequency changer of forming 5, by capacitor C ₉Summation current transformer 10, carrying object 13 series connection backs are formed the LC resonant circuit and are connected on frequency changer emitter node J ₁, J ₂On, thereby obtain an interchange resonant power that frequency ratio is higher.Four output terminals A of the driver 6 that the protective circuit of this power supply is made up of a UC3875 and 2 IR2110 type integrated packages ', B ', C ', D ' be connected on frequency changer T ₁, T ₂, T ₃, T ₄Four gate terminal A, B, C, D on; The control end H of driver links with room temperature control circuit 7, current foldback circuit 8, overtemperature prote circuit 9 respectively; wherein the input E of current foldback circuit and current transformer 10 link, and the input F of overtemperature prote circuit 9 links with the thermistor 11 that is placed on the heater 12.An accessory power supply 16 is arranged between power supply and driver 6, and this accessory power supply is the Industrial Frequency Transformer T by mutual series connection ₅, diode BD ₂Bridge rectifier, capacitor C ₁₀Form, supply with the driver protective circuit, to increase the stability of circuit with this accessory power supply.

Claims

1, a kind of energy-saving liquid electric heater; mainly adorn heater (12) by in a resonant power and one; the container (14) of its outer carry fluid (13) is formed, it is characterized in that the resonant power circuit structure be power supply successively the common mode inhibition filter circuit (2) formed at the voltage protection circuit of forming by pressure cell (1), by electric capacity, coil of series connection, the bridge rectifier (3) that is constituted by a diode, by capacitor C ₇, C ₈Form linear filtering circuit (4), double-click full-bridge frequency-conversion circuit (5) that transistor npn npns form, form resonant circuit after connecting by capacitor C 9 summation current transformers (10), carrying object (13) and be connected on frequency changer emitter node J by four IGBT insulated gate electrodes ₁, J ₂, on, four output terminals A of the driver of forming by integrated package (6) ', B ', C ', D ' be connected on four gate terminal A, B, C, the D of frequency changer, three inputs of driver link with room temperature control circuit (7), current foldback circuit (8), overtemperature prote circuit (9) respectively, wherein the input E of current foldback circuit and current transformer (10) link, and the thermistor (11) on the input F of overtemperature prote circuit (9) and the heater (12) links; The accessory power supply (16) of connecting between power supply and driver (6) in addition, this accessory power supply is the Industrial Frequency Transformer (T by mutual series connection ₅), diode BD2 bridge rectifier, capacitor C 10 form.

2, according to the heater described in the claim 1, it is characterized in that carrying object places the double wall of container (14), container (14) can be nonmetal or non-ferrous metal, container internal heat generation body is to be processed into corrugated stack back with the non-ferrous metal thin plate to form, and overlaps a non-ferrous metal ring (17) respectively at the heater two ends.

3,, it is characterized in that driver (6) can be connected to form by a UC3875 and two IR2110 type integrated packages according to the heater described in the claim 1.