A vertical high-temperature induction heating furnace with an extended heating element

Abstract

A vertical high-temperature induction heating furnace with an extended heating element comprises a furnace body, a heating element (1), a heat preservation layer, and an inductor (3) arranged in sequence in the furnace body, the middle of the heating element (1) is a furnace (50) for placing materials, the outer side of the furnace (50) is a heat preservation layer (2), and the outer side of the heat preservation layer (2) is provided with an inductor (3); the inductor (3) comprises a heating coil (3001) wound on the outer side of the heat preservation layer (2) and corresponding to the height of the furnace (50); the upper end surface of the heating element is higher than the upper end surface of the heating coil (3001) in the inductor (3) by arranging a thin-walled sleeve (1002) above the heating element or increasing the height of the heating element. By arranging the extended heating element, the heat preservation layer 2 can be made of powder material, which is conducive to improving the furnace temperature and service life, and the use of a thin-walled sleeve is conducive to reducing the use cost.

Description

Technical Field

[0001] The invention relates to an induction heating device, in particular to a vertical high-temperature induction heating furnace with an extended heating element. Background Art

[0002] The high-temperature induction heating furnace uses electromagnetic heating, and the temperature inside the furnace can reach over 3000°C. Such a high temperature places extremely high demands on the thermal insulation and heat-insulating functions of the furnace body. It not only requires the thermal insulation material to have good thermal insulation performance in a high-temperature environment, but also requires that the high-temperature structural components minimize the heat from the furnace to be brought outside the furnace. The furnace insulation layer of the existing high-temperature induction heating furnace is a solid thermal insulation material wrapped around the outside of the heating element, such as carbon felt, graphite felt, carbon fiber wool, etc. This solid thermal insulation material is severely burned in a high-temperature environment, affecting the thermal insulation effect. In order to ensure the thermal insulation effect, the technical means of a powder thermal insulation layer is currently used. The powder thermal insulation layer is a carbon paper powder thermal insulation material arranged around the heating element. This material will settle in volume when heated, so a suitable solution needs to be adopted to ensure that it still has a thermal insulation effect when the powder settles. Summary of the invention

[0003] The invention provides a high-temperature induction heating furnace with an extended heating element, which solves the problem that the existing induction heating furnace has a poor heat preservation effect.

[0004] The technical solution adopted by the present invention is:

[0005] A high-temperature induction heating furnace with an extended heating element, comprising a furnace body, a heating element (1), a heat-insulating layer, and an inductor (3) arranged in sequence in the furnace body, the middle of the heating element (1) being a furnace (50) for placing materials, the outer side of the furnace (50) being a heat-insulating layer (2), and the inductor (3) being arranged outside the heat-insulating layer (2); the inductor (3) comprising a heating coil (3001) wound around the outer side of the heat-insulating layer (2) and corresponding to the height of the furnace (50); the upper end surface of the heating element is higher than the upper end surface of the heating coil (3001) in the inductor (3) by the following method:

[0006] ① A thin-walled sleeve (1002) is installed above the heating element;

[0007] ② Increase the height of the heating element so that the increased height is consistent with the height of the heating element in ① plus the height of the thin-walled sleeve (1002).

[0008] Furthermore, the heating element (1) is columnar, and the thin-walled sleeve (1002) is stacked on top of the heating element (1), and the wall thickness of the thin-walled sleeve (1002) is smaller than the wall thickness of the heating element (1).

[0009] Furthermore, the wall thickness of the upper portion of the lengthened heating element is smaller than the wall thickness of the middle portion and the wall thickness of the lower portion.

[0010] Furthermore, the heating element (1) is formed by stacking a plurality of tubular sections.

[0011] Furthermore, the heating element (1) is a short heating element, the heating element is slightly higher than the furnace height, and the inner cover is placed on the top of the heating element.

[0012] Furthermore, the heating element (1) is a high-heating element, the heating element is much higher than the furnace, a step (1001) is provided on the inner wall of the heating element (1), and the inner cover is placed on the step (1001).

[0013] Furthermore, the thin-walled sleeve is arranged above the inner cover.

[0014] Furthermore, the thin-walled sleeve is arranged outside the inner cover.

[0015] Furthermore, an outer step is provided on the outer side of the upper end of the heating element, and a thin-walled sleeve is provided on the outer step.

[0016] Furthermore, the heating element (1) and the upper thin-walled sleeve (1002) are an integral structure.

[0017] Furthermore, the thermal insulation layer is a solid thermal insulation layer and / or a powder thermal insulation layer, and the solid thermal insulation layer is carbon felt or graphite felt.

[0018] Furthermore, the powder thermal insulation layer (2) comprises a container arranged on the periphery of the heating element (1) and a carbonaceous powder thermal insulation material filled in the container.

[0019] Furthermore, the upper insulation layer (9) or the upper part is arranged inside the thin-walled casing (1002).

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In order to ensure that the induction furnace works stably in a high temperature environment of 3000℃, a powder insulation layer is used between the heating element and the sensor. Since the powder insulation layer will settle at high temperatures, a large amount of powder insulation layer surplus must be set above the furnace. For this reason, the height of the heating element is correspondingly increased. Since the heating element above the furnace is in a lower temperature zone where the temperature changes from high to low, the heating element can be made into two sections, that is, the heating element above the furnace is made into a thin-walled sleeve. The thin-walled sleeve has a thinner wall, which can increase thermal resistance and reduce heat loss in the furnace. On the other hand, the thin-walled sleeve is in a lower temperature zone, has less burning loss, and the replacement cycle is much longer than the replacement cycle of the heating element, which can reduce the operating cost of the high-temperature furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a vertical high-temperature induction heating furnace with an extended heating element;

[0023] Figure 2This is a structural diagram of a short heating element vertical high temperature induction heating furnace;

[0024] Figure 3 This is a structural diagram of a high-heat-generating vertical high-temperature induction heating furnace;

[0025] Figure 4 It is a vertical high-temperature induction heating furnace with an extended heating element. DETAILED DESCRIPTION

[0026] The present invention is further described below with reference to specific examples. Unless otherwise specified, the raw materials and methods used in the examples of the present invention are conventional commercially available raw materials and conventionally used methods in the art.

[0027] Example 1

[0028] like Figure 1 As shown, a vertical high-temperature induction heating furnace with an extended heating element includes a furnace body 4, a heating element 1, a thermal insulation layer, and an inductor 3 arranged in sequence from the inside to the outside of the furnace body. The heating element 1 is cylindrical, and the inductor 3 is arranged at the outer ring position of the heating element 1. The inductor 3 is composed of a heating coil 3001 and a casting layer 3007. The casting layer 3007 is cast with high-temperature resistant insulating cement to wrap the heating coil 3001. A gap is set between the inductor 3 and the heating element 1, forming an annular space around the heating element 1. The annular space is filled with carbonaceous powder material. The filler in this embodiment is carbon black, forming a sleeve-type powder thermal insulation layer 2. The position on the inner side of the heating element 1 corresponding to the height of the heating coil 3001 of the inductor 3 is the furnace 50 for placing materials. The height of the heating coil 3001 corresponds to that of the furnace 50. The height of the heating element 1 is higher than the upper end surface of the furnace and the heating coil. The height of the insulation layer is consistent with the height of the heating element. The lengthened heating element wall is used as the inner wall of the powder insulation layer to carry the carbonaceous powder insulation material of the powder insulation layer. An inner cover is provided at the upper end of the furnace 50; an upper insulation layer 9 is provided above the furnace 50, and a lower insulation layer 10 is provided below the furnace 50.

[0029] The upper insulation layer 9 and the lower insulation layer 10 are carbon felt or graphite felt.

[0030] An upper powder insulation layer 7 and a lower powder insulation layer 8 are also provided above the heating element. The upper powder insulation layer comprises a container arranged on the upper step of the heating element and carbon black filled in the container; the lower powder insulation layer 8 comprises a container arranged below the heating element and carbon black filled therein.

[0031] like Figure 1 As shown, the heating element of this embodiment is tubular, and a movable cover plate 8001 is provided between the lower powder insulation layer 8 and the heating element. Figure 3 In the embodiment shown, the heating element is barrel-shaped, an inner bottom is provided at the lower end of the heating element, the lower powder insulation layer 8 has no upper cover, and the bottom of the heating element directly covers the upper part of the container of the lower powder insulation layer.

[0032] A temperature measuring tube 11 is provided above the heating element 1 , and the temperature measuring tube passes through the upper insulation layer, and the bottom end of the temperature measuring tube extends into the furnace 50 .

[0033] Example 2

[0034] like Figure 2 , 3 As shown in , 4, a vertical high-temperature induction heating furnace with an extended heating element comprises a heating element 1, a heat preservation layer, an inductor 3, and a furnace body 4 arranged in sequence from the inside to the outside. The heating element 1 is cylindrical, and the inductor 3 is arranged at the outer ring position of the heating element 1. The inductor 3 is composed of a heating coil 3001 and a casting layer 3007. The casting layer 3007 is cast with high-temperature resistant insulating cement to wrap the heating coil 3001. There is a gap between the inductor 3 and the heating element 1, forming an annular space around the heating element 1. The annular space is filled with carbonaceous powder material to form a sleeve-type powder insulation layer 2. The position on the inner side of the heating element 1 corresponding to the height of the heating coil 3001 of the inductor 3 is the furnace 50 for placing materials. A thin-walled sleeve 1002 is provided above the furnace 50 or the heating element 1. The wall thickness of the thin-walled sleeve 1002 is less than the wall thickness of the heating element 1. An inner cover is provided at the upper end of the furnace 50. An upper insulation layer 9 is provided above the furnace 50 and a lower insulation layer 10 is provided below the furnace 50. An annular inner cover 2001 is provided at the upper end of the sleeve-type powder insulation layer 2. The diameter of the annular inner cover is slightly smaller than the width of the sleeve powder insulation layer 2, so that it can rise and fall with the change of the volume of the powder material, which is conducive to compacting the powder material and ensuring the density and insulation performance of the powder insulation layer.

[0035] The heating element 1 is a high heating element, such as Figure 3 As shown, a step 1001 is provided on the inner wall of the heating element 1 , and the inner cover is placed on the step 1001 .

[0036] The outer side of the upper end of the heating element is provided with an outer step, the thin-walled sleeve is arranged on the outer step, the thin-walled sleeve and the inner cover are arranged in parallel in the vertical direction, and the inner cover is arranged on the inner side of the thin-walled sleeve. In other embodiments, the thin-walled sleeve is also arranged above the inner cover.

[0037] The thin-walled casing wraps the insulation layer, that is, a portion of the upper insulation layer 9 is wrapped inside the thin-walled casing 1002. Figure 4 As shown, the upper insulation layer 9 is entirely wrapped inside the thin-walled casing.

[0038] like Figure 2As shown, the inductor 3 is also provided with a lower cooling coil 3002 and an upper cooling coil 3003, which are respectively arranged on the upper and lower sides of the induction coil 3001 and are both wrapped in a casting layer 3007. A support plate 3005 is also provided on the outside of the casting layer to strengthen the strength of the inductor. An annular end plate 3005 is provided above the inductor 3, and a furnace bottom brick 3004 is provided below. A hoisting hole 30081 is provided on the annular end plate 3005, and a hoisting nut 3006 is provided on the furnace bottom brick 3004 corresponding to the hoisting hole 30081 for hoisting the furnace body. An annular cover plate 15 is also provided on the outside of the annular end plate 3005. The annular cover plate 15 is provided with a correction rod 14. The correction rod 14 connects the outer wall of the furnace body 4 and the inductor, and is used to adjust the positional relationship between the inductor and the furnace body to maintain coaxiality.

[0039] like Figure 2 As shown, a bottom plate 6001 is provided below the lower insulation layer 10, a furnace bottom brick 12 is provided between the bottom plate 6001 and the lower insulation layer 10, and an annular channel is provided between the furnace bottom brick 12 and the sensor 2 or the furnace bottom brick 3004 below the sensor, which is used to discharge the water and gas evaporated from the powder insulation layer. The furnace bottom 6 is provided with a furnace bottom cavity 6003 below the bottom plate 6001, and a plurality of through holes 6002 connected to the furnace bottom cavity 6003 are provided on the bottom plate 6001, and a sea bottom hole 6004 is provided below the furnace bottom cavity 6003, which is used to discharge the stored water and gas out of the furnace.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A high-temperature induction heating furnace with an extended heating element, comprising a furnace body, a heating element (1), a heat-insulating layer, and an inductor (3) arranged in sequence in the furnace body, characterized in that: The middle of the heating element (1) is a furnace (50) for placing materials, the outer side of the furnace (50) is a heat-insulating layer (2), and an inductor (3) is arranged on the outer side of the heat-insulating layer (2); an inner cover (7) for covering the furnace is arranged on the upper part of the heating element (1); the inductor (3) comprises a heating coil (3001) wound on the outer side of the heat-insulating layer (2) and corresponding to the height of the furnace (50); the heating element (1) is columnar, and a thin-walled sleeve (1002) is arranged above the heating element. The upper end surface of the thin-walled sleeve (1002) is higher than the upper end surface of the heating coil (3001) in the inductor (3), and the wall thickness of the thin-walled sleeve (1002) is less than the wall thickness of the heating element (1); a step (1001) is provided on the inner wall of the heating element (1), and the inner cover is placed on the step (1001); the thermal insulation layer is a powder thermal insulation layer, and the powder thermal insulation layer (2) comprises a container arranged on the periphery of the heating element (1) and a carbonaceous powder thermal insulation material filled in the container.

2. A high-temperature induction heating furnace with an extended heating element according to claim 1, characterized in that: The thin-walled sleeve is arranged above the inner cover.

3. A high-temperature induction heating furnace with an extended heating element according to claim 1, characterized in that: An outer step is provided on the outer side of the upper end of the heating element (1), and a thin-walled sleeve is provided on the outer step.

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