CN217005323U

CN217005323U - High temperature induction heating furnace inductor, induction heating furnace

Info

Publication number: CN217005323U
Application number: CN202120081510.1U
Authority: CN
Inventors: 言伟雄; 袁建陵
Original assignee: Zhuzhou Fullad Technology Co ltd
Current assignee: Zhuzhou Fullad Technology Co ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2022-07-19
Anticipated expiration: 2031-01-11

Abstract

An inductor for a high-temperature induction heating furnace comprises a heating coil (1) and an embedded cooling coil (2), wherein the heating coil (1) is a spiral coil; the embedded cooling coil (2) is spirally embedded in a turn-to-turn gap of the heating coil (1); the heating coil (1) and the embedded cooling coil (2) are both water pipelines; the inductor further comprises a pouring layer (6), and the heating coil (1) and the embedded cooling coil (2) are wrapped in the pouring layer (6). The inductor has the advantages of uniform heating temperature, high furnace temperature, uniform casting layer thickness of the inductor, difficult cracking and long service life.

Description

High temperature induction heating furnace inductor, induction heating furnace

Technical Field

The utility model relates to an inductor, in particular to an inductor for a high-temperature induction heating furnace; the utility model also relates to a high-temperature induction heating furnace adopting the inductor.

Background

With the continuous development of science and technology, the requirement of high-temperature materials on heat treatment temperature is higher and higher, some high-temperature materials hope that the heat treatment temperature can reach or exceed 3000 ℃, and an induction heating furnace is ideal heat treatment equipment capable of meeting the heat treatment process requirement of 3000 ℃, but the hearth temperature cannot reach more than 3000 ℃ due to the unreasonable design of an inductor and other reasons in the existing induction heating technology. The existing induction heating furnace comprises a continuous induction heating furnace, and a crucible is in dynamic motion in a hearth; there is also a discontinuous furnace, the crucible is in static heating in the hearth. For a continuous heating furnace, the crucible is in motion, and the heat of the hearth is also in motion under the motion of the crucible; when the discontinuous induction heating furnace is heated, the crucible is in a static state, the temperature in the hearth is usually low at two ends and high in the middle, and the coil space needs to be adjusted to keep the temperature of the hearth uniform. Therefore, the prior art lacks an inductor which can quickly reach more than 3000 ℃ and meet the requirements of various induction heating furnaces.

The utility model discloses a utility model with publication number CN203940735U discloses an electric stove is smelted to permanent-magnet alloy, has arranged the condenser tube of spiral in this utility model well furnace body, and heating coil arranges side by side with condenser tube, and cooling coil sets up the inboard at solenoid. However, after the heating coil of the utility model is finished, the cooling water circulation is started again, so that the furnace body and the heating coil are rapidly cooled to prepare for the next work. The electric furnace is used for smelting permanent magnetic alloy, has low temperature requirement, cannot use conductive powder heat-insulating materials because the heating coil is not wrapped by an insulating pouring layer, the temperature in the furnace pipe cannot reach 3000 ℃ uniformly, and the purpose of arranging the cooling water pipe in the furnace is to reduce the waste heat temperature in the furnace pipe after the liquid permanent magnetic alloy is discharged after being smelted so as to prepare for smelting the permanent magnetic alloy in the next furnace or adjust the temperature of the electromagnetic coil during heating, so that the electric furnace has no practical effect on increasing the temperature of the furnace.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the utility model provides the inductor for the high-temperature induction heating furnace, which has the advantages of high hearth temperature, high reliability of the heating furnace, long service life and the like.

An inductor for a high-temperature induction heating furnace comprises a heating coil (1) and an embedded cooling coil (2), wherein the heating coil (1) is a spiral coil; the embedded cooling coil (2) is spirally embedded in a turn-to-turn gap of the heating coil (1); the inductor further comprises a pouring layer (6), and the heating coil (1) and the embedded cooling coil (2) are wrapped in the pouring layer (6). The induction heating furnace works at the high temperature of 3000 ℃, a heat-insulating layer is required to be arranged around the heating body, and conventional heat-insulating materials such as carbon felt are burnt in a short time, so that a powder heat-insulating material is required to be adopted for prolonging the service life of the heat-insulating layer. Two outer walls of the powder heat-insulating layer are formed between the inner wall of the casting layer of the inductor and the outer wall of the heating body, and the powder heat-insulating material is filled in the middle of the two outer walls to form the powder heat-insulating layer.

Furthermore, the heating coil (1), the upper cooling coil (3) of the insert type cooling coil (2) and the lower cooling coil (4) are all water-passing metal pipelines, preferably copper pipes.

Furthermore, the heating coil (1) is provided with a plurality of paths, and a plurality of cooling water inlets and outlets are formed in the heating coil (1).

Further, the number of the embedded cooling coils (2) is two or more, and each embedded cooling coil (2) is arranged in the turn space of the heating coil (1) in an insulated mode.

Furthermore, both ends of the embedded cooling coil (2) extend out of the heating coil (1) or are flush with the heating coil (1).

Furthermore, either end of the embedded cooling coil (2) extends out of the heating coil (1), and the other end of the embedded cooling coil is flush with the heating coil (1).

Furthermore, the heater is also provided with an upper cooling coil (3) and/or a lower cooling coil (4), and the upper cooling coil (3) and the lower cooling coil (4) are arranged at the upper end and the lower end of the heating coil (1).

Furthermore, the heating coil (1), the embedded cooling coil (2), the upper cooling coil (3) and the lower cooling coil (4) are arranged in an insulating mode.

Furthermore, the embedded cooling coil (2) is composed of a plurality of sections, and the plurality of sections of the embedded cooling coil (2) are sequentially and spirally embedded in turn-to-turn gaps of the heating coil (1).

Further, the nested cooling coil (2) is arranged by a multi-track spiral coil in the inter-turn gap of the heating coil (1).

Furthermore, the inductor also comprises an annular base (8), an annular end plate (7) and a supporting strip (5); the heating coil (1), the embedded cooling coil (2), the upper cooling coil (3) and the lower cooling coil (4) are fixed on the supporting bar (5) in an insulating way; the upper end of the supporting bar (5) is fixed on the annular end plate (7), and the bottom of the supporting bar is fixed on the annular base (8).

Furthermore, the inductor casting layer is formed by casting insulating refractory cement, and each coil is wrapped in the insulating refractory cement.

Further, the utility model also provides an induction heating furnace adopting the inductor, wherein the induction heating furnace is a vertical induction heating furnace, a horizontal induction heating furnace, an intermittent induction heating furnace or a continuous induction heating furnace.

Compared with the prior art, the utility model has the beneficial effects that:

for a continuous induction heating furnace, a material boat is in the moving process from an inlet to an outlet, the movement of the boat brings the temperature obtained at the front end into the rear end, so that the temperature at the rear end is higher and higher, and if the temperature at the rear end is not properly attenuated by an inductor, a heating body at the rear end is seriously burnt, and the service lives of a hearth and the inductor are influenced.

The heating coil interturn gaps are arranged according to different high-temperature production processes, so that the problem of local excessive burning loss of the heating element is solved on the premise that the temperature of the hearth meets the requirements of the high-temperature production process, and the service lives of the heating element and the hearth of the high-temperature induction furnace including the continuous furnace are prolonged;

on the other hand, the cooling coil is embedded in the inter-turn gaps of the heating coil, so that the integral cooling effect and the high-temperature strength of the casting layer are enhanced, the casting layer is uniformly cooled and is not easy to crack, and the service life of the inductor is prolonged; the pouring layer has an insulating function, materials such as carbon black and the like filled in the powder heat-insulating layer have electric conductivity, and the insulating pouring layer can avoid the ignition phenomenon between the coil and the electric-conductive powder heat-insulating layer. The cooling coil is inlaid in the turn-to-turn gaps of the heating coil, the overall cooling effect and the high-temperature strength of the pouring layer are enhanced, the pouring layer is cooled uniformly and is not prone to cracking, and the phenomenon that powder permeates into the inductor from cracks and is short-circuited with the heating coil is avoided.

Drawings

FIG. 1 is a schematic view of an inductor structure for a high temperature induction heating furnace with different turn-to-turn distances;

FIG. 2 is a schematic diagram of an inductor structure for a multi-path cooling coil high-temperature induction heating furnace;

FIG. 3 is a schematic view of an inductor structure for a high temperature induction heating furnace with the same turn pitch;

FIG. 4 is a schematic view of an inductor structure for a high temperature induction heating furnace with different turn-to-turn distances;

FIG. 5 is a schematic view of an inductor structure for a high temperature induction heating furnace with different turn-to-turn distances;

FIG. 6 is a high temperature induction heating furnace.

Detailed Description

Example 1

As shown in fig. 3, an inductor for a high temperature induction heating furnace is used for a vertical high temperature induction heating furnace. The heating furnace comprises a furnace body 20, wherein the middle part of the furnace body is a heating body 21, and the center of the heating body is a hearth 50 for accommodating materials. The heat-generating body 21 is the tubbiness, the heat-generating body 21 outside is equipped with the heat preservation, including sleeve heat preservation 22, go up heat preservation 23 and heat preservation 24 down, the heat preservation wraps up heat-generating body 21 including, sleeve heat preservation 22 wraps up in the heat-generating body 21 side, sleeve heat preservation 22 top is equipped with apron 2201, go up heat preservation 23 and establish respectively in heat-generating body 21 top and below with heat preservation 24 down, 50 tops of furnace are equipped with inner cup 2301, go up to cover including heat preservation 23 establishes, it is equipped with temperature tube 25 to go up the heat preservation middle part, temperature tube 25 runs through heat preservation 23 and inner cup 2301. The inductor is arranged outside the sleeve heat-insulating layer 22 and corresponds to the hearth. Powder heat-insulating materials are filled between the inductor and the heating body to form a sleeve type powder heat-insulating layer, and the powder materials in the embodiment are carbon black.

The inductor comprises a pouring layer 6, wherein the pouring layer is formed by pouring oxide insulating cement resistant to high temperature of more than 1500 ℃, and a heating coil 1 and an embedded cooling coil 2 are arranged in the pouring layer 6. As shown in fig. 1, the inductor comprises a heating coil 1 and an insert type cooling coil 2, wherein the heating coil 1 is a spiral coil spirally wound on the outer side of a sleeve insulation layer; the embedded cooling coil 2 is spirally embedded in the turn-to-turn gaps of the heating coil 1. The heating coil 1 has small inter-turn gaps at two ends and large inter-turn gaps in the middle, and the arrangement is favorable for the balance of the furnace body temperature. The embedded cooling coil 2 is arranged between the large turns of the heating coil 1 in the middle of the furnace body, the turn-to-turn gaps at the two ends are small, the cooling coil cannot be arranged, and cooling water is introduced into the heating coil, so that the heating coil can be cooled by utilizing the cooling function of the heating coil.

The heater also comprises an upper cooling coil 3 and a lower cooling coil 4, wherein the upper cooling coil 3 and the lower cooling coil 4 are respectively arranged at the upper side and the lower side of the heating coil 1. The upper cooling coil and the lower cooling coil may be provided separately or simultaneously. The heating coil 1, the embedded cooling coil 2, the upper cooling coil 3 and the lower cooling coil 4 are all water-filled copper pipes. The heating coil 1 is electrically connected with a medium-frequency power supply, and the other coils are electrified when water is supplied.

In the embodiment, the heating coil 1, the bushing type cooling coil 2, the upper cooling coil 3 and the lower cooling coil 4 are arranged in an insulating way. The coils may be arranged without insulation, and the device may still operate as long as there is no short circuit inside each coil, even if there is no insulation between the coils, and there is only a potential and no current on the other coils except the heating coil (3001).

The plurality of embedded cooling coils 2 can be arranged, and the plurality of embedded cooling coils 2 are sequentially and spirally embedded in turn-to-turn gaps of the heating coil 1.

The inductor also comprises an annular base 8, an annular end plate 7 and a supporting strip 5; the heating coil 1, the embedded cooling coil 2, the upper cooling coil 3 and the lower cooling coil 4 are fixed on the supporting bar 5 in an insulating way; the upper ends of the supporting bars 5 are fixed on the annular end plate 7, and the bottoms of the supporting bars are fixed on the annular base 8; when the coil is poured, the pouring internal mold 10 is arranged in the central holes of the annular base 8 and the annular end plate 7, pouring materials are poured into the open slot or the through hole (7002), and the pouring internal mold 10 is detached after the pouring is finished.

Example 2

As shown in fig. 2, the present example is different from example 1 in that the inter-turn gap of the heating coil 1 in the middle of the furnace body is large and the inter-turn gaps at both ends are small. Two embedded cooling coils, an embedded cooling coil 2 and an embedded cooling coil 2001 are arranged in the middle inter-turn gap. No cooling coil is arranged between the 1 turns of the heating coil at the two ends.

The section size and the shape of the metal pipe of the embedded cooling coil 2 can be adjusted according to the size and the change of the turn-to-turn gaps of the heating coil so as to meet the requirement of different turn-to-turn gaps of the heating coil. Or one of the inserted cooling coil 2 and the inserted cooling coil 2001 is set as a long coil and the other is set as a short coil, and the turn-to-turn gaps of the heating coils are different by adjusting the length of the inserted cooling coil.

In other embodiments, the nested cooling coils 2 are arranged in multiple paths and/or multiple segments, which can further meet the requirement of the heating coil for the size change of the inter-turn gaps. The multiple paths mean that the cooling coils are arranged in parallel, and the multiple sections mean that the cooling coils are arranged end to end between each section.

Example 3

Referring to fig. 3, the inductor in this embodiment is used in a vertical continuous induction heating furnace, in which a furnace chamber of the heating furnace is vertically through, a boat inlet is arranged above the furnace chamber, a boat outlet is arranged below the furnace chamber, the boat is driven by a device in the furnace chamber to slowly move from top to bottom, and induction heating is completed during the movement. In this case, the heating coil 1 of the inductor is a coil having the same inter-turn gap, the insert cooling coil 2 is disposed in the inter-turn gap of the heating coil 1, the insert cooling coil 2 extends above and below the heating coil 1, and the extending portions form an upper cooling coil 3 and a lower cooling coil 4, respectively.

In other embodiments, both ends of the cooling coil 2 are flush with the heating coil 1, or either end of the cooling coil 2 protrudes out of the heating coil 1 and the other end is flush with the heating coil 1.

Example 4

In order to adjust the temperature of the hearth, the turn pitch of the heating coil 1 can be set, so that the electromagnetic induction power is changed, and the requirement of adjusting the temperature in the furnace is met. The arrangement of the nested cooling coil 2 can be adjusted according to the difference of the inter-turn gaps. As shown in fig. 5, the induction coil 1 has a high density of inter-turn gaps at the lower end, the nested cooling coil 2 is not provided, and has a low density at the upper end, the nested cooling coil 2 is provided, and the nested cooling coil 2 is located above the heating coil 1. As shown in fig. 4, a cooling coil 3 is also provided above the nested cooling coil 2.

It should be understood that the above-described 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. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An inductor for a high-temperature induction heating furnace, characterized in that: the heating coil comprises a heating coil (1) and an embedded cooling coil (2), wherein the heating coil (1) is a spiral coil; the embedded cooling coil (2) is spirally embedded in a turn-to-turn gap of the heating coil (1); the inductor further comprises a pouring layer (6), and the heating coil (1) and the embedded cooling coil (2) are wrapped in the pouring layer (6).

2. The inductor for the high-temperature induction heating furnace according to claim 1, wherein the heating coil (1), the nested cooling coil (2), the upper cooling coil (3), and the lower cooling coil (4) are all metal pipes through which water flows.

3. The inductor for the high temperature induction heating furnace according to claim 2, wherein the heating coil (1) has a plurality of stages, and the number of cooling water inlets and outlets on the heating coil (1) is plural.

4. The inductor for a high temperature induction heating furnace according to claim 2, wherein the number of the nested cooling coils (2) is plural, and each of the nested cooling coils (2) is arranged in an inter-turn gap of the heating coil (1) in an insulated manner.

5. The inductor for the high-temperature induction heating furnace according to claim 1, wherein both ends of the insert type cooling coil (2) extend out of the heating coil (1) or are flush with the heating coil (1).

6. The inductor for a high temperature induction heating furnace as defined in claim 1, wherein the embedded cooling coil (2) extends from the heating coil (1) at either end thereof and is flush with the heating coil (1) at the other end thereof.

7. The inductor for the high temperature induction heating furnace according to claim 1, wherein the heating coil (1) is further provided with an upper cooling coil (3) and/or a lower cooling coil (4), and the upper cooling coil (3) and the lower cooling coil (4) are provided at upper and lower ends of the heating coil (1).

8. The inductor for the high temperature induction heating furnace according to claim 7, wherein the heating coil (1), the nested cooling coil (2), the upper cooling coil (3), and the lower cooling coil (4) are arranged in an insulated manner.

9. The inductor for a high temperature induction heating furnace as recited in claim 1, wherein said jacketed cooling coil (2) is formed of a plurality of sections, and said plurality of sections of said jacketed cooling coil (2) are sequentially spirally inserted into turn-to-turn gaps of the heating coil (1).

10. The inductor for a high temperature induction heating furnace according to claim 1, wherein the nested cooling coil (2) is arranged by a multi-track spiral coil in the inter-turn space of the heating coil (1).

11. The inductor for the high-temperature induction heating furnace according to claim 1, further comprising an annular base (8), an annular end plate (7) and a support bar (5); the heating coil (1), the embedded cooling coil (2), the upper cooling coil (3) and the lower cooling coil (4) are fixed on the supporting bar (5) in an insulating way; the upper end of the supporting bar (5) is fixed on the annular end plate (7), and the bottom of the supporting bar is fixed on the annular base (8).

12. The inductor for a high temperature induction heating furnace according to claim 1, wherein the casting layer encloses the coil with an insulating refractory casting material.

13. An induction heating furnace, characterized in that the inductor for a high-temperature induction heating furnace according to any one of claims 1 to 12 is used, and the induction heating furnace is a vertical induction heating furnace, a horizontal induction heating furnace, a batch induction heating furnace or a continuous induction heating furnace.