CN202303839U

CN202303839U - Three-phase power-frequency dual electromagnetic inductive liquid heater

Info

Publication number: CN202303839U
Application number: CN2011204280126U
Authority: CN
Inventors: 吴荣华
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-01
Filing date: 2011-11-01
Publication date: 2012-07-04
Anticipated expiration: 2021-11-01

Abstract

The utility model relates to a three-phase power-frequency dual electromagnetic inductive liquid heater. A ferromagnetic metallic plate which is excellent in magnetic conductive performance and easily generates eddy current and hysteresis is arranged on the periphery of a seven-secondary short circuit heating device to form a magnetic conductive frame. During operation, the magnetic conductive frame makes the magnetic leakage generated by the seven-secondary short circuit heating device to form a loop, and eddy current and hysteresis are generated in the magnetic conductive frame inductively and turns the magnetic conductive frame into an eddy current heating device. The eddy current heating device and the seven-secondary short circuit heating device simultaneously heat the liquid medium flowing through the eddy current heating device and the seven-secondary short circuit heating device. When the seven-secondary short circuit heating device is connected with a three-phase power-frequency power supply, liquid is heated through two heating methods of short circuit and eddy current via an induction heater, so that short circuit magnetic leakage is restricted in the magnetic conductive frame and effectively controlled and used. Since magnetic leakage is wattless, the heating efficiency of the three-phase power-frequency dual electromagnetic inductive liquid heater is greater than 1.0, which is the upper limit for conventional heater.

Description

Liquid is with three-phase main-frequency double electromagnetic induction heating apparatus

Technical field

The utility model relates to a kind of main-frequency electromagnetic induction short circuit and inductive loop heater, a kind of more precisely three-phase main-frequency electromagnetic induction short circuit and inductive loop heater that is used for heating liquid.

Background technology

Alleged here eddy current heating is meant a kind of electrical heating that is produced Joule effect by the line-frequency induction eddy current.Its operation principle is, the magnetic line of force of alternation produces eddy current and magnetic hysteresis through conductor in conductor, and what wherein produce Joule effect mainly is eddy current, so the title eddy current heats.

Alleged here short circuit heating is meant a kind of electrical heating that is produced Joule effect by the line-frequency induction short circuit current.Document number is that the Chinese patent ZL01134187.4 of CN1142706C discloses a kind of liquid and just belongs to this example with three-phase main-frequency electromagnetic induction and short-circuit heater; Its operation principle is according to the former secondary turn ratio of transformer, to make secondary obtain low-voltage and high-current; In above-mentioned patent; Secondary is 1 circle, and short circuit formation loop, so claim the short circuit heating.Press the transformer technical term, the satisfactory post of part of winding is set on the iron core, do not establish winding on the iron core and only work the part that constitutes closed magnetic loop and claim yoke; Above-mentioned patent creatively utilizes metal shell as secondary; It surrounds unshakable in one's determination and former limit winding along the three-phase closed magnetic loop; Like this; On the stem of iron core, form the secondary quoit of three short circuits, on the yoke position of iron core, form the secondary quoit of four short circuits, totally 7 secondary short circuits (above-mentioned patent is hereinafter to be referred as 7 secondary short circuit heaters).When the logical three phase worker power of former edge joint, each secondary quoit of metal shell is then responded to the generation Short-Circuit High Current; The secondary quoit of each phase place and same metal shell conducting and producing reaches three alternate Short-Circuit High Current between phase and phase.Above-mentioned two kinds of different Short-Circuit High Current make metal shell by Fast Heating, and its vector sum of three characteristics of the middle term short circuit equals zero, and metal shell is zero potential during operation, safety.Above-mentioned two kinds of Short-Circuit High Current produce the leakage field that is not of the common run, and this is to this heater but is not of the common run for the heat affecting that exploitation becomes the necessary guard shield of commercial article, electric cabinet etc. equally, if do not take certain measure then can influence normal operation.And above-mentioned patent is not mentioned the short circuit leakage field.

Fig. 1 is the Distribution of Magnetic Field (boundary condition is enough far away) under the transformer short-circuit situation, and in this case, former secondary all has electric current, and the magnetic field major part that the electric current of two windings produces is cancelled out each other.Distribute and can find out from Fig. 1 magnetic induction intensity line, spatial distribution mainly be stray field (see " engineering electromagnetic field ", publishing house of Tsing-Hua University---2004.9).Obviously, have the above-mentioned 7 secondary short circuit heaters of two kinds of different short circuits, the magnetic induction intensity of its leakage field certainly will be greater than magnetic induction intensity shown in Figure 1.

Summary of the invention

The purpose of the utility model provides a kind of liquid with three-phase main-frequency double electromagnetic induction heating apparatus and heating means, the leakage field of above-mentioned 7 secondary short circuit heaters is placed restrictions in circulating box and is effectively utilized, during operation heat imitate higher, safety and reliability.

The technical conceive of the utility model is: the metallic plate of using the ferromagnetism material had not only been had magnetic property well but also be prone to produce the mechanism of eddy current and magnetic hysteresis; With it be arranged on 7 secondary short circuit heaters around; Like this, both made the short circuit leakage field receive effective control, and made it become an eddy current calandria again.

The liquid of realization the utility model with the technical scheme of three-phase main-frequency double electromagnetic induction heating apparatus (being designated hereinafter simply as two induction heating apparatuses) is: two induction heating apparatuses of the utility model comprise 7 secondary short circuit heaters, circulating box and pipe-line system; 7 secondary short circuit heaters are fixed on the interior base in the circulating box, and preset pore and the welding in facade top fixed after its junction block stretched out circulating box; The intake header of pipe-line system passes the preset pore in the preceding facade bottom of circulating box, passes interior base, and welding is fixing respectively; This intake header divides three way outlets after getting into circulating box; One the tunnel establishes 1～12 circular hole outlet below this intake header of interior base position; In addition two the tunnel before interior base this intake header each side establish a L type arm; The import and the intake header of each L type arm are welded to connect, and outlet is welded to connect with 7 secondary short circuit heater corresponding inlet pipes respectively; Upper end at circulating box is provided with outlet conduit; Its design feature is: above-mentioned pair of induction heating apparatus also comprises the magnetic conduction frame of ferromagnetism material; Three of this magnetic conduction frames tightly cover the inboard of facade behind the circulating box and about; Fourth face is located in the circulating box and is positioned at the rear side of L type arm; The magnetic conduction frame is overlooked and is " mouth " font, and its upper end is higher than above-mentioned 7 secondary short circuit heaters, and the lower end is until the circulating box bottom surface; Keep certain spacing and spacing uniformity with above-mentioned 7 secondary short circuit heaters all around, thereby constitute the passage that a circulating fluid flows.During operation; All circulating fluids to be heated all thus passage pass through from bottom to top; The leakage field that the magnetic conduction frame induces above-mentioned 7 secondary short circuit heaters to be produced forms the loop with it; Produce eddy current and magnetic hysteresis and make it to become an eddy current heater at magnetic conduction frame internal induction, it and above-mentioned 7 secondary short circuit heaters heat their liquid medium of flowing through simultaneously, the short circuit leakage field is placed restrictions in the magnetic conduction frame and obtained effective control and utilization.

Above-mentioned magnetic conduction frame is made by the metallic plate of ferromagnetism material, and preferred thickness is 1～3 millimeter stainless iron plate or a steel plate.

Passage between above-mentioned magnetic conduction frame and the 7 secondary short circuit heaters, the big I of its spacing is that 0.7～2.0 meter calculating of per second is confirmed by flow of liquid through the flow velocity of this passage.

The utlity model has good effect: (1) magnetic conduction frame is also water conservancy diversion of magnetic conduction both; It increases all circulating fluids flow velocity through the passage between short circuit and eddy current two heaters time; Heat exchange is more abundant, surveys former limit winding temperature rise decline 7.2K, the service life of favourable short-circuit heater; (2) the magnetic conduction frame has been placed restrictions on the radiation of leakage field, and the temperature rise of actual measurement protecting sheathing drops to 15K from 57K, has guaranteed security of operation; (3) the magnetic conduction frame makes idle short circuit leakage field can convert heat energy to, and the actual measurement thermal efficiency brings up to 1.108 from 0.977, has improved 11.1 percentage points, and is energy-conservation, save money.The utility model is through to further improvement of ZL01134187.4 and perfect, inexpensive, and energy-conservation and economic effect is very good but.

Description of drawings

Fig. 1 is the Distribution of Magnetic Field diagrammatic sketch under the transformer short-circuit situation.

Fig. 2 is the magnetic conduction frame one member sketch map of the three-phase main-frequency double electromagnetic induction heating apparatus of the utility model.

Fig. 3 is another member sketch map of magnetic conduction frame of the three-phase main-frequency double electromagnetic induction heating apparatus of the utility model: wherein Fig. 3-a is a front view, and Fig. 3-b is the side view of Fig. 3-a, and Fig. 3-c is the vertical view of Fig. 3-a.

Fig. 4 is a kind of structural representation of the three-phase main-frequency double electromagnetic induction heating apparatus of the utility model: wherein Fig. 4-a is a front view, and Fig. 4-b is the side view of Fig. 4-a, and Fig. 4-c is the A-A cross sectional plan view of Fig. 4-a.

Fig. 5 is a kind of complete commercial article of the three-phase main-frequency double electromagnetic induction heating apparatus of the utility model: wherein Fig. 5-a is a front view, and Fig. 5-b is the side view of Fig. 5-a.

The specific embodiment

(embodiment)

Fig. 2 has shown the diagrammatic sketch of the magnetic conduction frame one member 18-1 of the utility model.

3 views of Fig. 3 have shown the diagrammatic sketch of another member of magnetic conduction frame 18-2 of the utility model.

3 views of Fig. 4 have shown the dual sense heater 50 of the utility model.7 secondary short circuit heaters 30 (liquid in the ZL01134187.4 patent documentation is with three-phase main-frequency electromagnetic induction and short-circuit heater 30) are fixed on the base 14 of circulating box 13 with the mode that junction block 6 is positioned at the top rear side; Get the magnetic conduction frame member 18-2 of above-mentioned Fig. 3, with its circular hole pass junction block 6 its three of backs tightly cover the inboard of circulating box 13 back facades and about, welding is fixing respectively; Get the magnetic conduction frame member 18-1 of above-mentioned Fig. 2, its big small sircle hole is passed each entrance branch 11 of intake header 16 and 7 secondary short circuit heaters respectively, its lower end and the welding of circulating box bottom surface are fixing, about fixing with the left and right sides side welding of magnetic conduction frame member 18-2; Like this; Be formed on 7 secondary short circuit heaters 30 around a peripheral magnetic conduction frame 18 that is provided with, overlook and be " mouth " font, be higher than the upper surface of above-mentioned short-circuit heater 30 on its; The lower end is until the base plate of circulating box 13; Keep certain spacing and spacing uniformity with 7 secondary short circuit heaters 30 all around, this magnetic conduction frame 18 induces the leakage field of 7 secondary short circuit heaters 30 to form the loop, and forms the passage 19 that circulating fluid flows again; Liquid to be heated divides three tunnel water outlets by circulating pump after intake header 16 pumps into the magnetic conduction frame 18 of circulating box 13 from liquid reserve tank (not providing the figure): the one tunnel sprays downwards through circular hole 15, and the diffusion back upwards; Two the tunnel through 6 the import pipes 11 of L type arm 17 through 7 secondary short circuit heaters 30 in addition; Get into the gap of two rectangular tubes 5 and conducting element 10, discharge and admission passage 19 (rectangular tube 5 sees the ZL01134187.4 patent for details with the concrete structure of conducting element 10) from the other end of two rectangular tubes 5 then.Above-mentioned three road liquid are through the shell of 7 secondary short circuit heaters 30 and the surface of magnetic conduction frame 18; With its joule's heat energy that produces short circuit and eddy current along with heated liquid from exporting 12 discharges; Get back in the storage tank, so go round and begin again, with the liquid heat of liquid reserve tank to the temperature that requires.

2 views of Fig. 5 have shown a kind of complete commercial article 100 of the dual sense heater of the utility model; Get the dual sense heater 50 of above-mentioned Fig. 4; Be installed on the support 54 with guard shield 51, it and electric cabinet 60 are installed on the same base 56, stationary structure; Be provided with heat-insulation layer (not providing among the figure) between above-mentioned heater 50 and the guard shield 51; The bottom of heater 50 is provided with blowoff valve 55; On the pipeline of its import 16, be provided with inlet temperature sensor 52 and pressure sensor 53, on the pipeline of its outlet 12, be provided with outlet temperature sensor 57; The selected low-voltage electrical apparatus of supporting electric cabinet can detect fault-signals such as short circuit in the electrical system, overcurrent, electric leakage effectively; And detect signals such as outlet water temperature, exit port water temperature difference, pressure from above-mentioned each sensor and all deliver to the PLC cyclelog; Send control or alarm signal by PLC according to the program of establishment then, realize unmanned, safety operation automatically.

(Test Example)

Get 37 secondary short circuit heaters 30 of above-mentioned same specification; Under the same power supplies condition, do following 3 tests: the 1st 7 secondary short circuit heater 30 is directly exposed in the air; It is enough far away to press Fig. 1 boundary condition; Promptly in the scope of its 5 times of height dimensions no any metalwork, the relevant data of surveying this 7 secondary short circuit heater 30 sequence number 1 that sees the following form; Other 27 secondary short circuit heaters 30 are not established magnetic conduction frame 18 by the ZL01134187.4 patent respectively and with the utility model magnetic conduction frame 18 are set and are assembled into complete commercial article 100 as shown in Figure 5; Wherein the material of circulating box 13 is that 304 stainless steels, circulatory mediator are that condition such as the material Q235, insulation of water, protecting sheathing 51 is identical, the relevant data of actual measurement see the following form respectively sequence number 2 and sequence number 3.From table, can know and see that 7 secondary short circuit heaters, 30 boundary conditions are different, parameters is also different; What wherein amplitude of variation was maximum is reactive power: sequence number 1 boundary condition is enough far away; The reactive power of its consumption is minimum, is the excitation reactive power consumption, comprising leakage field; Next be sequence number 2,7 secondary short circuit heaters 30 around do not have magnetic conduction frame 18, reactive power is bigger than sequence number 1 amplification, the higher position of the temperature rise of its protecting sheathing 51 is that the leakage field of this 7 secondary short circuit heater 30 makes so; Sequence number 3 is the utility model; Be provided with magnetic conduction frame 18 around the 7 secondary short circuit heaters 30; Reactive power amplification is maximum, and the temperature rise of its protecting sheathing 51 declines to a great extent, and actual measurement thermal efficiency η reaches 1.108 innovation height; Obviously, this is that the leakage field of this 7 secondary short circuit heater 30 produces eddy current and makes so also in magnetic conduction frame 18! Here, though that leakage field belongs to is idle, magnetic energy also be can, be convertible into heat energy equally.In addition, in the table measured data to detect in the future the short circuit leakage field can convert to heat energy no mechanical equivalent confirm to have worth.

Table

Above embodiment is the explanation to the specific embodiment of the utility model; But not to the restriction of the utility model; The technical staff in relevant technologies field is under the situation of spirit that does not break away from the utility model and scope; Can also make various conversion and variation and obtain the corresponding technical scheme that is equal to, so all technical schemes that are equal to all should be included into the scope of patent protection of the utility model.

Claims

1. a liquid comprises 7 secondary short circuit heaters (30), circulating box (13) and pipe-line system with three-phase main-frequency double electromagnetic induction heating apparatus; 7 secondary short circuit heaters (30) are fixed on the interior base (14) in the circulating box (13), and it is fixing that its junction block (6) stretches out facade top, circulating box (13) back preset pore and welding; The intake header of pipe-line system (16) passes the preset pore in the preceding facade of circulating box (13) bottom, passes interior base (14), and welding is fixing respectively; This intake header (16) gets into circulating box (13) back and divides three way outlets; One the tunnel at interior base (14) position; 1～12 circular hole outlet (15) is established in this intake header (16) below, and two the tunnel is preceding at interior base (14) in addition, this intake header (16) each side establish a L type arm (17); The import of each L type arm (17) and intake header (16) are welded to connect, and outlet is welded to connect with the corresponding inlet pipe (11) of 7 secondary short circuit heaters (30) respectively; Upper end at circulating box (13) is provided with outlet conduit; It is characterized in that: the magnetic conduction frame (18) that also comprises the ferromagnetism material; (18) three of this magnetic conduction frames tightly cover the inboard of circulating box (13) back facade and about; Fourth face is located in the circulating box (13) and is positioned at the rear side of L type arm (17); Magnetic conduction frame (18) is overlooked and is " mouth " font, and its upper end is higher than above-mentioned 7 secondary short circuit heaters (30), and the lower end is until circulating box (13) bottom surface; Keep certain spacing and spacing uniformity with above-mentioned 7 secondary short circuit heaters (30) all around, thereby constitute the passage (19) that a circulating fluid flows; During operation; All circulating fluids to be heated all thus passage (19) pass through from bottom to top; The leakage field that magnetic conduction frame (18) induces above-mentioned 7 secondary short circuit heaters (30) to be produced forms the loop with it; Produce eddy current and magnetic hysteresis and make it to become an eddy current heater at magnetic conduction frame (18) internal induction; It and above-mentioned 7 secondary short circuit heaters (30) heat their liquid medium of flowing through simultaneously, the short circuit leakage field is placed restrictions in magnetic conduction frame (18) and obtained effective control and utilization.

2. liquid according to claim 1 is characterized in that with three-phase main-frequency double electromagnetic induction heating apparatus: said magnetic conduction frame (18) is made by the metallic plate of ferromagnetism material.

3. liquid according to claim 2 is characterized in that with three-phase main-frequency double electromagnetic induction heating apparatus: the plate body of magnetic conduction frame (18) is that thickness is 1～3 millimeter stainless iron plate or steel plate.

4. liquid according to claim 1 is with three-phase main-frequency double electromagnetic induction heating apparatus; It is characterized in that: the passage (19) between magnetic conduction frame (18) and the 7 secondary short circuit heaters (30), the big I of its spacing is that 0.7～2.0 meter calculating of per second is confirmed by flow of liquid through the flow velocity of this passage (19).