CN2429777Y

CN2429777Y - HF induction heating boiler at normal voltage

Info

Publication number: CN2429777Y
Application number: CN 00207225
Authority: CN
Inventors: 秦光明
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-06-21
Filing date: 2000-06-21
Publication date: 2001-05-09
Anticipated expiration: 2010-06-21

Abstract

The utility model relates to an HF induction electric heating boiler at a normal voltage. The inner part of an iron core wound with an electromagnetic coil is provided with a heating channel, both ends of the heating channel are respectively used as a cold water inlet and a hot water outlet, the periphery of the iron core is provided with a water jacket which is provided with a water inlet and a water outlet, and which are respectively connected with the cold water inlet and the hot water outlet; the coil is controlled by a high frequency power source controlling device which can generate variable frequency square waves, the inner part of the iron core can generate electromagnetic eddy currents, and thereby, electric energy can be converted into heat energy by using the magnetic hysteresis loss generated by the iron core. The utility model has the advantages of high heat conversion and power factor, compact structure, no need of a power compensation device, low cost, automatic control, and no environmental pollution; the utility model is an ideal product for replacing an existing boiler.

Description

Normal pressure high-frequency induction boilers heated electrically

The utility model relates to field of boilers, particularly a kind of high-frequency induction boilers heated electrically.

Boilers heated electrically has than fire coal, fuel oil, the remarkable superiority of gas fired-boiler: pollution-free, the thermal efficiency is high, easy to use, reliability is high, safety is relatively taken up an area of fewly, small investment particularly is easy to automatic control, can realize unmanned.

The boilers heated electrically overwhelming majority commonly used at present is an electric resistor heating type, as electric hot plate or electric heating tubular type, its major defect is: 1. electrothermal tube (plate) is of poor quality, the life-span is low, though the life-span of import can extend to 4-5, but cost an arm and a leg, the user is difficult to accept; 2. thermal inertia is big, heat energy loss height when colding and heat succeed each other conversion, and when regulating temperature control especially automatically, cold and hot conversion is frequent, and the regulation and control response speed is slow; 3. still continue to use the mode of heating of traditional boiler, strict to the manufacturing of heat exchanger, respective volume is still bigger; 4. control circuit is loaded down with trivial details, inconvenient maintenance management.

A kind of boiler plant that adopts line-frequency induction heating also appearred on the market, though technically than resistance-type advanced person many, technology is also immature, mainly has following shortcoming:

Power factor low, need to increase power factor compensation device, volume is big, the cost height;

2. operating frequency is low, and the electromagnetic induction temperature is few, and firing rate is slow;

3. still need to make heat-exchange device, volume is big.

The purpose of this utility model is to overcome above-mentioned defective, and a kind of thermal efficiency height is provided, and heating is fast, and directly-heated type does not need heat-exchange device, and volume is little, and power factor is high and do not need to carry out the normal pressure high-frequency induction boilers heated electrically of power back-off.

Technical scheme is:

A kind of normal pressure high-frequency induction boilers heated electrically, the two ends that comprise heat tunnel, heat tunnel are respectively cold water inlet and hot water outlet, it is characterized in that: heat tunnel is located within the heat conduction iron core, is surrounded with solenoid on the iron core, the electric high frequency electric source control device that is connected with in the two ends of coil.

Be surrounded with a water jacket outside iron core, water jacket is provided with one and the water inlet that links of cold water inlet and one and the delivery port that links of hot water outlet.

The high frequency electric source control device comprises that an industrial frequency AC becomes flow directing device, and a DC voltage and a frequency conversion square-wave voltage converter that industrial frequency AC becomes flow directing device output link; The square-wave voltage of frequency conversion square-wave voltage converter output through Switch Power Transformer boosts after with the coil formation high-frequency induction heating major loop that links; Other has a parameter to set control circuit, and its control signal output links with frequency conversion square-wave voltage converter, constitutes the high-frequency induction heating parameter control unit.

The utility model has been owing to adopted said structure, and adopted the high-frequency induction heat electric road, thereby: (1) mode of heating becomes directly-heated type and need not heat-exchange device, adds thermal effect and significantly improves; (2) heating frequency height, electromagnetic induction heating efficient height, firing rate is fast, power factor is high and need not power factor compensation equipment; (3) connection circuit is few, and simple in structure, manufacturing and maintenance cost are low; (4) adopt the VFC heating power, have advantages such as thermal inertia is little, the adjustment characteristic is good, energy-conservation.

Make more detailed description below in conjunction with attached Fig. 1 and 2.

Fig. 1 is a structure principle chart of the present utility model;

Fig. 2 is the electric control theory block diagram.

Embodiment:

Normal pressure high-frequency induction heating boiler, in the heat conduction iron core of making by electromagnetic material 4 that in housing 14, is provided with, the heat tunnel 1 that being provided with supplies water passes through, one end expose outside the iron core 4 as cold water inlet 2, and its other end exposes outside the iron core 4 equally as hot water outlet 3; Be wound with solenoid 5 on the iron core 4; Above-mentioned part all is encapsulated in the water jacket 6, be provided with a water inlet 7 and delivery port 8 on the water jacket 6 too, water inlet 7 links with cold water outlet 2, and delivery port 8 links with hot water mouth 8, water jacket 6 can make full use of the waste heat that iron core 4 heats as heat-insulation layer, improves the thermal efficiency.The two ends of coil 5 draw that high frequency electric source control device 9 links outside the water jacket 6.

High frequency electric source control device 9 becomes flow directing device (rectifier) 10, controlled frequency conversion square-wave voltage converter 11, Switch Power Transformer 12 and parameter setting control circuit 13 formations of frequency by an industrial frequency AC.

What adopt in parameter setting control circuit 13 present embodiments is a Computer Control Unit, various control parameters can be imported by keyboard, the output interface of computer and frequency conversion square-wave voltage converter 11 link, frequency conversion square-wave voltage converter (11) is made of the IGBT circuit that adopts FET to constitute, under the control of computer, produce a changeable frequency by frequency conversion square-wave voltage converter 11, the alternating voltage that pulsewidth is controlled, after boosting, Switch Power Transformer links again with coil 5, in coil 5, produce an alternation high frequency electric, thereby in iron core 4, produce induced electromotive force and induced electricity eddy current, thereby iron core produces magnetic hystersis loss thus and converts electric energy to heat energy, thereby the media such as flowing water that can will flow through in the heat tunnel 1 by this heat energy directly heat the function that realizes heating.

Claims

1. normal pressure high-frequency induction boilers heated electrically, comprise heat tunnel (1), the two ends of heat tunnel (1) are respectively cold water inlet (2) and hot water outlet (3), it is characterized in that: heat tunnel (1) is located within the heat conduction iron core (4), be surrounded with solenoid (5) on the iron core (4), the electric high frequency electric source control device (9) that is connected with in the two ends of coil (5).

2. normal pressure high-frequency induction boilers heated electrically according to claim 1, it is characterized in that being surrounded with outside iron core (4) water jacket (6), water jacket (6) is provided with one and the water inlet (7) that links of cold water inlet (2) and one and the delivery port (8) that links of hot water outlet (3).

3. normal pressure high-frequency induction boilers heated electrically according to claim 1 and 2, it is characterized in that high frequency electric source control device (9) comprises that an industrial frequency AC becomes flow directing device (10), a DC voltage and a frequency conversion square-wave voltage converter (11) that industrial frequency AC becomes flow directing device (10) output link; The square-wave voltage of frequency conversion square-wave voltage converter (11) output through Switch Power Transformer (12) boosts after with coil (5) the formation high-frequency induction heating major loop that links; Other has a parameter to set control circuit (13), and its control signal output links with frequency conversion square-wave voltage converter (11), constitutes the high-frequency induction heating parameter control unit.