CN2311909Y

CN2311909Y - Thermal conductive high-temperature resistant composite electric heating body

Info

Publication number: CN2311909Y
Application number: CN 96241316
Authority: CN
Inventors: 徐国汉
Original assignee: Individual
Current assignee: Xu Guohan
Priority date: 1996-10-25
Filing date: 1996-10-25
Publication date: 1999-03-24
Anticipated expiration: 2006-10-25

Abstract

The utility model relates to a composite electric heater using high-temperature resistant materials having high thermal conductivity as base materials and using the electrothermal alloy as heating elements. The thermal conductive high-temperature resistant materials, such as the Silicon carbide, or the Silicon nitride combining the Silicon carbide, etc., are fired into a basal body provided with a groove and the lead-out holes of electrodes. The groove of the basal body is provided with the electrothermal alloy wire and leads out the electrode of electric source, the electrothermal alloy wire is buried in the thermal conductive high-temperature resistant basal body by using the thermal conductive high-temperature resistant fillers, and then the utility model is formed by baking and room temperature curing. The utility model has the advantages of fast heat transferring, high thermal inefficiency, long lifetime, high durability, large power range, wide temperature range, etc., and is suitable for the household electrical appliance, daily electric heating products and the occasions using the electric heating products, such as industries, the electric stoves for laboratories, etc.

Description

Heat conductive thermo-resisting compound electric heated body

It is base material with carborundum or the contour heat conduction exotic material of silicon nitride combined silicon carbide that the utility model relates to a kind of, is the combined type electric heating device that heating element is made with the electrothermal alloy material.

At present, using more electric heater in the industrial and civilian electric heating products mainly is the lectrothermal alloy wire that spiral twines, or serve as the electrothermal tube that the basis makes with it, or be that the basis adds the electric hot tray that heat-conducting metal is made again with the electrothermal tube, in the industrial silk hole that also the helical form heating wire is installed in silicon carbide furnace hall, boiler tube, stove plate, to improve thermal conductivity and temperature tolerance.More than these heaters mostly be as heat-conducting medium with air, or with magnesia powder as heat-conducting medium, because the thermal conductivity of air is very low, magnesian thermal conductivity is not high yet, so existing, this class heater conducts heat slowly, the heater element working temperature is too high, element short, shortcomings such as the device heat efficiency is low, big energy-consuming in useful life; Two kinds of new-type electrothermal devices have appearred again on the market in recent years, the one, various types of Electric radiant Heating Film, a kind of is the conductivity ceramics heater element, the advantage of Electric radiant Heating Film and conductivity ceramics is that firing rate is fast, and heat is imitated high, and they have wretched insufficiency part separately again, Electric radiant Heating Film is because very thin, content of material is few, and the performance of proof voltage impact and anti-rush of current is all very poor, damages easily; Conductivity ceramics is easily aging, and useful life is short; These two kinds of devices all are restricted in the use in high-temperature region and high-power district.

The purpose of this utility model be to provide that a kind of heat transfer is fast, heat imitate high, the life-span is long, power bracket is big, the long-lived heat conduction heatproof compound electro-thermal device that serviceability temperature is wide, easy to install.

The purpose of this utility model is to realize like this, be divided into two kinds of implementations of individual devices type and integrated type, the individual devices type is to make like this, carborundum or the contour heat conduction exotic material of silicon nitride combined silicon carbide are fired into the compound electro-thermal device matrix that has setting groove and electrode fairlead, it is round that matrix is divided into the plane, curved surface is round, dull and stereotyped square, the semicircle cartridge type, six kinds of fundamental mode series such as cast and crucible type, after matrix bakes, the lectrothermal alloy wire of choosing certain sectional area by power demand is installed in the groove along groove is straight or tortuous, and by electrode fairlead installation current electrode, heating wire can be one or more, can be many parallel connections or series connection, working power can be to exchange or direct current, install after lectrothermal alloy wire or band and the power electrode, with the high temperature resistant clay of high heat conduction groove and fairlead position are filled and led up, the electric heating element envelope is embedded in the heat conducting refractory base body, then the electric heating element that fills is sent into and toasted sintering in the high temperature furnace, or cold curing, after treating that filler curing drying and sintering is good, just can use, also can be again at the coating and the protective coating of external coating one deck enhanced rad of compound electric-heating element, this has just finished the making of individual devices type; The heat conductive thermo-resisting compound electric heated body of integrated type is to make like this, make insulating support and electrode tip holder earlier at the outer wall that is heated utensil (conductor class), lectrothermal alloy wire or band are installed on the insulating support by design power, and the extraction electrode of connecting with the mains: the insulation class is heated utensil, can directly heating wire or band and electrode be installed at its outer wall, heating wire or band are coated with are embedded in the heat conduction heat-resistant coating around being heated utensil with the heat conduction heat-resistant coating then, after treating the coating drying, send into sintering or cold curing in the high temperature furnace, then, cladding heat-insulation layer and back-up coat outside it have promptly been finished the making of integrated type heat conductive thermo-resisting compound electric heated body again; Another kind of integrated type compound electric-heating element is to be affixed on the outer wall that is heated utensil or outer bottom and to constitute individual devices type compound electro-thermal body and function heat conduction heatproof is gluing.

The utility model is owing to be heating element directly to be sealed be embedded in the heat conduction temperature-resistant material, the heat that it produces has directly been passed to Heat Conduction Material fast, thereby the electric heating element working temperature is low, life-span is long, heating is rapid, heat is imitated high, energy savings, it combine Electric radiant Heating Film fast, efficient and the heating wire cost is low, longevity is durable, power bracket is big, the advantage of the wide grade of temperature range two aspects.

Be described further below in conjunction with embodiment and accompanying drawing:

Accompanying drawing (1) is the structure chart of rectangle electric heating element; Accompanying drawing (2) is its end view, and 1 is electrode cap among the figure; The 2nd, the electric heating element matrix; The 3rd, wiring groove; The 4th, heating wire, L are that electric heating element is long, get between the 10mm to 2000mm to be worth; W is that electric heating element is wide, gets between the 5mm to 1500mm to be worth; D is that electric heating element is thick, gets between the 1mm to 100mm to be worth; E is a slot pitch, gets between the 1mm to 200mm to be worth; N is the groove number, get 3 to 300 between value; G is a groove width, gets between the 0.2mm to 20mm to be worth; H is a groove depth, gets between the 0.2mm to 50mm to be worth; B is an electrode fairlead diameter, gets the value of asking of the 0.2mm to 50mm.

Accompanying drawing (3) is the matrix external form figure of positive square electric heating element, and accompanying drawing (4) is its end view, and the span of L, W, D, e, n, g, h, B is identical with above-mentioned rectangle electric heating element, here L=W.

Accompanying drawing (5) is the external form figure of the matrix of the round electric heating element in plane, and accompanying drawing 6 is its end views, and the span of D, h, B, n, e, h is identical with the rectangle electric heating element, and φ A is the diameter of round electric heating element, and A gets between the 10mm to 2000mm and is worth; φ C is the diameter of center thermometer hole, and C is worth between getting 0 to 50mm.

Accompanying drawing (7) is the matrix external form figure of the round electric heating element of curved surface, and accompanying drawing (8) is its end view, and the span of A, C, D, h, B, n, e, g is identical with the flat round electric heating element of face, and R is the radius of curvature of curved surface, and R gets between the 10mm to 10000mm and is worth.

Accompanying drawing (9) is the external form figure of semicircular cylinder electric heating element matrix, accompanying drawing (10) is its end view, L is the height of semicircular cylinder, φ A is the internal diameter of semicircular cylinder, and D is the thick of semicircular cylinder, and n is the groove number, e is that slot pitch, g are groove widths, h is a groove depth, and B is an electrode fairlead diameter, and the value of L, A, D, B, h, n, e, g is identical with round electric heating element.

Accompanying drawing (11) is the external form figure of cast electric heating element matrix, and accompanying drawing (12) is its end view, and L is a pipe range, and A is a bore, and D is a thickness of pipe wall, and the span of L, A, D, n, e, g, h is identical with the semicircular cylinder electric heating element.

Accompanying drawing (13) is the external form figure of crucible type electric heating element matrix, and L is the crucible height, and the crucible internal diameter of φ A, D are wall thickness, and the span of L, A, D, n, e, g, h is identical with cast.

The structure chart of the integrated type electric heating element of accompanying drawing (14), the 5th, by heater; The 6th, protection back-up coat, the 7th, insulating support; The 8th, heating wire; The 9th, the heat conduction heat-resistant coating; The 10th, power electrode; The 11st, thermocouple; The 12nd, heat-insulation layer.L is high, and A is an internal diameter, and D is a wall thickness, and the span of A, C, D is identical with the span of crucible type in the individual devices type.

Claims

1. heat conductive thermo-resisting compound electric heated body, its principal character is to be fired into the compound electric-heating element matrix that has setting slot structure and electrode fairlead with high thermal conductivity exotic materials such as carborundum or silicon nitride combined silicon carbides, matrix is divided into six kinds of fundamental modes, the lectrothermal alloy wire or the band of power demand are installed in the groove along groove is straight or tortuous, and by electrode fairlead installation current electrode, with the high temperature resistant clay of high heat conduction groove and fairlead position are filled and led up then, heating wire or band envelope are embedded in the groove, make through toasting sintering or cold curing again.

2. heat conductive thermo-resisting compound electric heated body according to claim 1, the outer surface that it is characterized in that electric heating element is the coating and the protective coating of the enhanced rad of brushing one deck again.

3. heat conductive thermo-resisting compound electric heated body according to claim 1, it is round to it is characterized in that electric heating element is divided into the plane, and curved surface is round, dull and stereotyped square, semicircle cartridge type, cast and six kinds of fundamental mode series of crucible type.

4. heat conductive thermo-resisting compound electric heated body according to claim 3 is characterized in that their length or high L and diameter A get between the 10mm to 2000mm and be worth; Their wide W gets between 5mm to 1500mm and is worth; Thickness D gets between the 1mm to 100mm and is worth; Center-hole diameter C is worth between getting 0 to 50mm; Slot pitch e gets between the 1mm to 200mm and is worth; Groove is counted value between the n poly-3 to 300, and groove width g gets between the 0.2mm to 20mm and is worth; Groove depth h gets between the 0.2mm to 50mm and is worth, and electrode fairlead diameter B gets between the 0.2mm to 50mm and is worth.

5. heat conductive thermo-resisting compound electric heated body according to claim 1 is characterized in that this electric heating element is divided into individual devices type and two kinds of versions of integrated type.

6. the heat conductive thermo-resisting compound electric heated body of integrated type according to claim 5, it is characterized in that being heated in the conductor type earlier the outer wall elder generation making insulating support and the electrode tip holder of utensil, twine heating wire or band more thereon and power electrode is installed, heating wire is coated with is embedded in the heat conduction heat-resistant coating around being heated utensil with the heat conduction heat-resistant coating then, again cladding heat-insulation layer and overcoat outside it.

7. integrated type heat conductive thermo-resisting compound electric heated body according to claim 5 is characterized in that it is to be affixed on the outer wall that is heated utensil or outer bottom and to constitute individual devices type compound electro-thermal body and function heat conduction heatproof is gluing.