阅读说明：本技术 一种节能型感应加热装置 (Energy-saving induction heating device ) 是由 郭延强 王顺兴 郭志强 于 2021-08-19 设计创作，主要内容包括：本发明提供一种节能型感应加热装置,属于感应加热器技术领域,包括感应装置本体,所述感应装置本体包括无水冷感应加热器,所述无水冷感应加热器包括抗氧化感应加热线圈,所述抗氧化感应加热线圈包括感应加热线圈,所述感应加热线圈的表面设有抗氧化涂层,所述抗氧化涂层包括设于感应加热线圈的表面的内附层和设于内附层的外表面的搪瓷涂层,所述抗氧化感应加热线圈外包裹有耐火层包裹体,所述耐火层包裹体的外表面设有保温层；本发明可以提高感应加热线圈的抗氧化作用,同时提高加热装置的使用寿命,提高热效率,降低热损耗,降低工程造价。(The invention provides an energy-saving induction heating device, which belongs to the technical field of induction heaters and comprises an induction device body, wherein the induction device body comprises a water-cooling-free induction heater, the water-cooling-free induction heater comprises an antioxidant induction heating coil, the antioxidant induction heating coil comprises an induction heating coil, the surface of the induction heating coil is provided with an antioxidant coating, the antioxidant coating comprises an inner attached layer arranged on the surface of the induction heating coil and an enamel coating arranged on the outer surface of the inner attached layer, the antioxidant induction heating coil is wrapped with a refractory layer wrapping body, and the outer surface of the refractory layer wrapping body is provided with a heat insulation layer; the invention can improve the antioxidation of the induction heating coil, prolong the service life of the heating device, improve the thermal efficiency, reduce the thermal loss and reduce the construction cost.)

1. An energy-saving induction heating device, characterized in that: including induction system body (01), induction system body (01) is including anhydrous cold induction heater (02), anhydrous cold induction heater (02) are including anti-oxidant induction heating coil (101), anti-oxidant induction heating coil (101) are including induction heating coil (1), induction heating coil's (1) surface is equipped with anti-oxidant coating (10), anti-oxidant coating (10) are including interior boundary layer (111) of locating induction heating coil's (1) surface and enamel coating (12) of locating the surface of interior boundary layer (111), anti-oxidant induction heating coil (101) outer parcel has flame retardant coating inclusion (2), the surface of flame retardant coating inclusion (2) is equipped with heat preservation (3).

2. The energy saving induction heating apparatus according to claim 1, characterized in that: the induction heating coil (101) is in a spiral shape made of a solid copper strip or a copper tube.

3. The energy saving induction heating apparatus according to claim 2, characterized in that: the induction heating coil is made of copper tube and has two ends sealed by welding.

4. The energy saving induction heating apparatus according to claim 2, characterized in that: the thickness of the oxidation resistant coating (10) is 0.15-0.20 mm.

5. The energy saving induction heating apparatus according to claim 4, characterized in that: the inner attached layer (111) is a sand blasting layer (11) arranged on the surface of the induction heating coil (1).

6. The energy saving induction heating apparatus according to claim 4, characterized in that: the inner adhesion layer (111) is a Ni-P alloy plating layer (13) provided on the surface of the induction heating coil (1).

7. The energy saving type induction heating apparatus according to any one of claims 1 to 5, wherein: the induction device body (01) is a tubular heating furnace which comprises a heating cavity (4) formed by a water-cooling-free induction heater (02).

8. The energy saving induction heating apparatus according to any one of claims 1 to 4 or 6, characterized in that: the induction device body (01) is a smelting furnace with a barrel-shaped structure, and the smelting furnace comprises a heating smelting cavity (6) formed by a water-cooling-free induction heater (02).

9. The energy saving induction heating apparatus according to claim 8, characterized in that: and a hearth (5) which is made of bulk materials on the inner wall of the refractory layer inclusion body (2) is arranged in the heating and smelting cavity (6).

10. The energy saving induction heating apparatus according to claim 8, characterized in that: a graphite crucible (7) is arranged in the heating smelting cavity (6).

Technical Field

The invention relates to the technical field of induction heaters, in particular to an energy-saving induction heating device.

Background

When alternating current passes through the conductor, an alternating magnetic field is generated around the conductor, and when metal is placed in the alternating magnetic field, eddy current is generated in the metal, and the metal is heated by the joule heat effect of the eddy current, which is called induction heating. The induction heating has the characteristics of high heating speed, high thermal efficiency and the like. Such conductors for energizing are referred to as induction heaters, simply inductors. To reduce the joule heating effect generated when current passes through the inductor, the inductor is usually made of pure copper with relatively small resistivity. Induction heating is commonly used in the fields of metal heat treatment heating, metal forging heating, metal melting, and the like.

Because the inductor is used in a high-temperature environment, the temperature of the inductor is quickly increased, so that the inductor is oxidized, the sectional area of the inductor is reduced, the resistance is increased, and the inductor is fused to lose the conductive function. In order to solve the problem of oxidation of a copper inductor at high temperature, at present (except for a few occasions of low-temperature heating), circular tubes or square tubes are used for manufacturing the inductor, and the surface of the inductor is prevented from being oxidized due to overhigh temperature and finally being fused in a water cooling mode in the tubes. The water cooling has the following disadvantages: the large amount of heat is taken away, the electric energy utilization rate is reduced, a water cooling system is needed, the construction cost is increased, the water resource is consumed, and safety accidents can be caused if water leakage occurs.

Disclosure of Invention

In view of the above, the present invention provides an energy-saving induction heating device, which improves the oxidation resistance of the induction heating coil, and at the same time, prolongs the service life of the heating device, improves the thermal efficiency, reduces the thermal loss, and reduces the construction cost.

In order to solve the technical problem, the invention provides an energy-saving induction heating device which comprises an induction device body, wherein the induction device body comprises a water-cooling-free induction heater, the water-cooling-free induction heater comprises an anti-oxidation induction heating coil, the anti-oxidation induction heating coil comprises an induction heating coil, an anti-oxidation coating is arranged on the surface of the induction heating coil, the anti-oxidation coating comprises an inner attached layer arranged on the surface of the induction heating coil and an enamel coating arranged on the outer surface of the inner attached layer, a fire-resistant layer wrapping body wraps the anti-oxidation induction heating coil, and an insulating layer is arranged on the outer surface of the fire-resistant layer wrapping body.

Furthermore, the induction heating coil is in a spiral shape made of a solid copper strip or a copper tube.

Further, a spiral induction heating coil made of a copper pipe is used, and both ends of the induction heating coil are sealed by a welding method.

Further, the thickness of the anti-oxidation coating is 0.15-0.20 mm.

Furthermore, the surface of the induction heating coil is provided with a sand blasting layer, and the anti-oxidation coating comprises an enamel coating arranged on the outer surface of the sand blasting layer.

Further, the anti-oxidation coating comprises a Ni-P alloy coating layer arranged on the surface of the induction heating coil, and an enamel coating is arranged on the outer surface of the Ni-P alloy coating layer.

Furthermore, the refractory layer inclusion comprises a refractory cement layer, and a plurality of alumina hollow spheres are embedded in the refractory cement layer.

Furthermore, the heat-insulating layer is a plurality of layers, and the thickness of each layer is 10 mm.

Further, the heat-insulating layer is a refractory fiber felt or a heat-insulating felt containing nano aerogel.

Further, the induction device body is a tubular heating furnace, and the heating furnace comprises a heating cavity formed by a water-cooling-free induction heater.

Further, the induction device body is a smelting furnace with a barrel-shaped structure, and the smelting furnace comprises a heating smelting cavity formed by a water-cooling-free induction heater.

Furthermore, a hearth which is made of scattered materials on the inner wall of the fire-resistant layer inclusion body is arranged in the heating and smelting cavity.

Furthermore, a graphite crucible is arranged in the heating and smelting cavity.

The technical scheme of the invention has the following beneficial effects:

1. according to the invention, through a non-water-cooling induction heating mode and a first heat conduction law verification, the heat dissipation power per unit area is only 33.4% of that of water cooling, the energy-saving effect is obvious, and meanwhile, water resources can be saved, and the accident caused by water leakage is avoided.

2. In the invention, the surface of the copper induction coil is subjected to enamel or chemical Ni-P alloy plating and oxidation and then subjected to enamel, and no obvious oxidation still exists after 1000h of test at the high temperature of 700 ℃ and 800 ℃ respectively, so that the oxidation resistance of the induction heater at the high temperature is effectively improved, and the service life of the heating device is prolonged.

3. In the present invention, heat loss can be further reduced by adding a refractory layer between the metal being heated and the induction heating coil; the heat loss is further reduced by wrapping the inductor with a thermal insulation material.

4. In the refractory material, the alumina hollow spheres are added into the refractory cement, so that the heat dissipation coefficient can be greatly reduced, and the heat dissipation power is reduced; also in design, by increasing the radius of the induction coil, the heat dissipation power can be reduced under the condition that the inner diameter is unchanged and the temperature of the induction coil is unchanged.

5. The heating device, namely the heating furnace or the smelting furnace, is easy to process, produce and manufacture, and reduces the construction cost.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

FIG. 3 is a schematic structural diagram according to embodiment 3 of the present invention;

FIG. 4 is a sectional view of a copper wire of an oxidation-resistant induction heating coil in example 1 of the present invention;

FIG. 5 is a sectional view of a copper wire of an oxidation-resistant induction heating coil in example 2 or 3 of the present invention;

fig. 6 is a partial structural view of the refractory inclusion of the present invention.

1. An induction heating coil; 101. an oxidation resistant induction heating coil; 10. an oxidation resistant coating; 11. spraying a sand layer; 12. enamel coating; 111. an inner adhesive layer; 13. a Ni-P alloy plating layer; 2. a refractory layer inclusion; 21. a refractory cement layer; 22. alumina hollow spheres; 3. a heat-insulating layer; 4. a heating cavity; 5. a hearth; 6. heating a smelting cavity; 7. a graphite crucible.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 6 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

In one embodiment of the invention, as shown in fig. 1, 4, 6: the utility model provides an energy-saving induction heating device, includes induction system body 01, induction system body 01 includes no water cooling induction heater 02, induction system body 01 is pipy heating furnace, the heating furnace includes the heating chamber 4 that is formed by no water cooling induction heater 02, no water cooling induction heater 02 includes anti-oxidant induction heating coil 101, anti-oxidant induction heating coil 101 includes induction heating coil 1, induction heating coil 1's surface is equipped with anti-oxidant coating 10, anti-oxidant induction heating coil 101 outer parcel has flame retardant coating inclusion 2, the surface of flame retardant coating inclusion 2 is equipped with heat preservation 3.

The induction heating coil 1 is in a solid copper strip spiral shape.

The refractory layer inclusion 2 comprises a refractory cement layer 21, and a plurality of alumina hollow spheres 22 are embedded in the refractory cement layer 21.

Wherein the thickness of the oxidation resistant coating is 0.18 mm.

Wherein, the inner adhesion layer 111 is a sand blasting layer 11 arranged on the surface of the induction heating coil 1, and the oxidation-resistant coating 10 comprises an enamel coating 12 arranged on the outer surface of the sand blasting layer 11.

Wherein, the heat preservation layer 3 is 3 layers of heat preservation felts with the thickness of 10mm and containing nano aerogel.

Using the induction device body 01 described above, such a tubular heater or furnace can be used for heating metal workpieces or blanks such as a rotary body, for example, for quenching of a bearing ring, a piston pin, or for heating of a cylindrical forged blank. When the induction heating coil is used specifically, the metal piece can be heated through the heating area 4 at a certain speed, and the heating temperature can be adjusted by controlling the current passing through the induction heating coil 1 and the movement speed of the metal piece.

In a further embodiment of the present invention,

as shown in fig. 2, 5 and 6: the utility model provides an energy-saving induction heating device, includes induction system body 01, induction system body 01 includes no water-cooling induction heater 02, the induction system body is the smelting furnace of tubbiness structure, the smelting furnace includes the heating smelting chamber that is formed by no water-cooling induction heater, the heating smelting intracavity is equipped with the furnace that adopts the scattered material of beating to be made at the inner wall of flame retardant coating inclusion, no water-cooling induction heater 02 includes anti-oxidant induction heating coil 101, anti-oxidant induction heating coil 101 includes induction heating coil 1, induction heating coil 1's surface is equipped with anti-oxidant coating 10, the outer parcel of anti-oxidant induction heating coil 101 has flame retardant coating inclusion 2, the surface of flame retardant coating inclusion 2 is equipped with heat preservation 3.

The induction heating coil 1 is in a solid copper strip spiral shape.

The refractory layer inclusion 2 comprises a refractory cement layer 21, and a plurality of alumina hollow spheres 22 are embedded in the refractory cement layer 21.

The inner adhesion layer 111 is a Ni-P alloy plating layer 13 arranged on the surface of the induction heating coil 1, and an enamel coating 12 is arranged on the outer surface of the Ni-P alloy plating layer 13.

Wherein the thickness of the enamel coating 12 is 0.18mm, and the thickness of the Ni-P alloy plating layer 13 is 5 μm.

Wherein, the heat preservation layer 3 is a heat preservation felt which is 5 layers and 10mm thick and contains nanometer aerogel.

By using the induction device body 01, the hearth 5 made of bulk materials is often used for smelting ferrous metals such as steel and cast iron.

In another embodiment of the invention, as shown in fig. 3, 5, 6: the utility model provides an energy-saving induction heating device, includes induction system body 01, induction system body 01 includes no water-cooling induction heater 02, induction system body 01 is the smelting furnace of tubbiness structure, the smelting furnace includes the heating smelting chamber that is formed by no water-cooling induction heater 02, the heating smelting intracavity is equipped with graphite crucible 7, no water-cooling induction heater 02 includes anti-oxidant induction heating coil 101, anti-oxidant induction heating coil 101 includes induction heating coil 1, induction heating coil 1's surface is equipped with anti-oxidant coating 10, the outer parcel of anti-oxidant induction heating coil 101 has flame retardant coating inclusion 2, the surface of flame retardant coating inclusion 2 is equipped with heat preservation 3.

The induction heating coil 1 is in a solid copper strip spiral shape.

The inner adhesion layer 111 is a Ni-P alloy plating layer 13 arranged on the surface of the induction heating coil 1, and an enamel coating 12 is arranged on the outer surface of the Ni-P alloy plating layer 13.

Wherein the thickness of the enamel coating 12 is 0.18mm, and the thickness of the Ni-P alloy plating layer 13 is 5 μm.

The refractory layer inclusion 2 comprises a refractory cement layer 21, and a plurality of alumina hollow spheres 22 are embedded in the refractory cement layer 21.

Wherein, the heat preservation layer 3 is a heat preservation felt which is 5 layers and 10mm thick and contains nanometer aerogel.

The graphite crucible 7 is placed on the induction device body 01 to be used for melting nonferrous metals such as copper and aluminum and alloys thereof.

In another embodiment of the invention, the energy-saving induction heating device comprises an induction device body 01, the induction device body 01 comprises a water-cooling-free induction heater 02, the induction device body 01 is a tubular heating furnace, the heating furnace comprises a heating cavity 4 formed by the water-cooling-free induction heater 02, the water-cooling-free induction heater 02 comprises an antioxidant induction heating coil 101, the antioxidant induction heating coil 101 comprises an induction heating coil 1, the surface of the induction heating coil 1 is provided with an antioxidant coating 10, the antioxidant induction heating coil 101 is wrapped with a refractory layer wrapping body 2, and the outer surface of the refractory layer wrapping body 2 is provided with an insulating layer 3.

The induction heating coil 1 is in a spiral shape made of a copper pipe, the spiral induction heating coil 1 made of the copper pipe is adopted, and two ends of the induction heating coil 1 are sealed by a welding method.

Wherein the thickness of the oxidation resistant coating is 0.18 mm.

Wherein, the inner adhesion layer 111 is a sand blasting layer 11 arranged on the surface of the induction heating coil 1, and the oxidation-resistant coating 10 comprises an enamel coating 12 arranged on the outer surface of the sand blasting layer 11.

The refractory layer inclusion 2 comprises a refractory cement layer 21, and a plurality of alumina hollow spheres 22 are embedded in the refractory cement layer 21.

Wherein, the heat preservation layer 3 is 3 layers of heat preservation felts with the thickness of 10mm and containing nano aerogel.

Examples of the experiments

The first tubular heating device is taken to further explain from the aspects of energy-saving principle and energy-saving effect,

let the inner radius of the refractory material tube, i.e. the refractory layer inclusion 2, be r₀Outer radius of r₁The thermal conductivity of the refractory material is lambda₀(1+α₀T) inner wall temperature T₀Wherein the temperature is slightly lower than the metal temperature if solid metal is heated and equal to the liquid metal temperature if liquid metal is heated; r is₁The temperature of the location is T₁The inner radius of the heat-insulating layer 3 is r₁(neglecting the inductor thickness) with an outer radius r ₂The thermal conductivity coefficient of the thermal insulation material is lambda₁(1+α₁T) the surface temperature of the heat-insulating layer 3 is T₂At an ambient temperature of T_{Ring (C)}The heat exchange coefficient between the heat insulating material and the environment is beta.

Obtaining the inner surface according to a first law of heat conduction (r ═ r)₀) Heat dissipation power per unit area J₀＝λ₀[1+α₀(T₀+T₁)/2](T₀-T₁)/[r₀ln(r₁/r₀)]；

It follows that T is reduced₀-T₁I.e. increase T₁The temperature, the heat dissipation power per unit area is reduced.

For example, the usual forging heating temperature T₀1050 deg.C, if the inductor is cooled with water, T₁About 100 ℃, if water cooling is not used, set T₁The ratio of the heat dissipation power per unit area to 750 ℃ is as follows: (1+ 900. alpha₀)*300/(1+575α₀) /950 if taken as α₀＝2×10^-4Then, it is 0.334, i.e. when T is₁The temperature is increased to 750 ℃, the heat dissipation power per unit area is only 33.4 percent of that of water cooling, and the energy-saving effect is obvious.

To make r equal to r₁Temperature T of₁750 ℃, the outer side of the heat-insulating layer 3 must be added, and the power diffused outwards per unit area is as follows:

J₁＝(r₀/r₁)J₀＝λ₁[1+α₁(T₁+T₂)/2](T₁-T₂)/[r₁ln(r₂/r₁)]＝

(r₀/r₁)×λ₀[1+α₀(T₀+T₁)/2](T₀-T₁)/[r₀ln(r₁/r₀)]，

namely:

λ₁[1+α₁(T₁+T₂)/2](T₁-T₂)/[r₁ln(r₂/r₁)]＝(r₀/r₁)×λ₀[1+α₀(T₀+T₁)/2](T₀-T₁)/[r₀ln(r₁/r₀)](equation 1).

The radius of the heat-insulating layer 3 is r₂The power of the diffusion per unit area is:

J₂＝(r₀/r₂)J₀＝(r₀/r₂)×λ₀[1+α₀(T₀+T₁)/2](T₀-T₁)/[r₀ln(r₁/r₀)]which is equal to

Power dissipated to the environment beta (T)₂-T_{Ring (C)})，

Namely:

(r₀/r₂)×λ₀[1+α₀(T₀+T₁)/2](T₀-T₁)/[r₀ln(r₁/r₀)]＝β(T₂-T_{ring (C)}) (equation 2)

T can be obtained by simultaneously solving the above two equations₂And r₂。

Selecting heat conductivity coefficient lambda₀Small materials also reduce the heat dissipation power per unit area. The aluminum oxide hollow spheres are added into the refractory cement, so that the heat dissipation coefficient can be greatly reduced, and the heat dissipation power is reduced. In design, if the radius of the induction coil is increased, the heat dissipation power can be reduced under the condition that the inner diameter is unchanged and the temperature of the induction coil is unchanged.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.