阅读说明：本技术 一种改进的中频感应加热炉 (Improved intermediate frequency induction heating furnace ) 是由 周成林 张亚非 张耀中 谢立平 于 2019-11-13 设计创作，主要内容包括：一种改进的中频感应加热炉,其包括中频电源柜,加热装置。所述加热装置包括炉壳,感应炉体,感应线圈。所述炉壳包括外壳,进料装置,感应线圈连接装置,以及气体置换装置。所述气体置换装置包括进气口与出气口。所述感应炉体包括保温外壳,以及石墨坩埚。所述石墨坩埚由石墨制成。所述保温外壳的轴向长度大于所述石墨坩埚的轴向长度。所述感应线圈环绕在所述保温外壳外侧的位置与所述石墨坩埚的位置对应,从而所述感应线圈产生的交变磁场可充分切割所述石墨坩埚,以将所述石墨坩埚加热,并可利用所述石墨坩埚的温度加热非金属材料。该改进的中频感应加热炉不但提升了金属材料的加热效率,而且还可以控制加热环境内的气体并加热非金属材料。(An improved medium-frequency induction heating furnace comprises a medium-frequency power supply cabinet and a heating device. The heating device comprises a furnace shell, an induction furnace body and an induction coil. The furnace shell comprises a shell, a feeding device, an induction coil connecting device and a gas replacement device. The gas replacement device comprises a gas inlet and a gas outlet. The induction furnace body comprises a heat-insulating shell and a graphite crucible. The graphite crucible is made of graphite. The axial length of the heat preservation shell is larger than that of the graphite crucible. The position of the induction coil surrounding the outer side of the heat preservation shell corresponds to the position of the graphite crucible, so that the alternating magnetic field generated by the induction coil can fully cut the graphite crucible to heat the graphite crucible, and the non-metal material can be heated by utilizing the temperature of the graphite crucible. The improved intermediate frequency induction heating furnace not only improves the heating efficiency of the metal material, but also can control the gas in the heating environment and heat the non-metal material.)

1. The utility model provides a modified intermediate frequency induction heating furnace, includes an intermediate frequency power cabinet, its characterized in that: the improved medium-frequency induction heating furnace comprises a heating device which is arranged on a medium-frequency power supply cabinet and connected with the medium-frequency power supply cabinet, the heating device comprises a furnace shell, an induction furnace body arranged in the furnace shell and an induction coil surrounding the outer side of the induction furnace body, the induction coil and the induction furnace body are arranged at intervals, the furnace shell comprises a shell, a feeding device arranged on the shell, an induction coil connecting device arranged on the shell and a gas replacement device which is used for vacuumizing the shell and arranged on the side wall of the shell, the gas replacement device comprises an air inlet and an air outlet, the feeding device is arranged along the axial direction of the shell, the central axis of the feeding device is coincided with the central axis of the induction furnace body, the induction furnace body comprises a heat-preserving shell fixedly connected in the furnace shell, the graphite crucible is contained in the heat-insulating shell, the heat-insulating shell is made of one of inorganic asbestos and aluminum silicate, the graphite crucible is made of graphite, the heat-insulating shell and the graphite crucible are arranged along the direction of a central shaft of the furnace shell, the opening direction of the heat-insulating shell and the opening direction of the graphite crucible face the feeding device, the axial length of the heat-insulating shell is greater than that of the graphite crucible, and the position of the induction coil surrounding the outer side of the heat-insulating shell corresponds to that of the graphite crucible, so that the alternating magnetic field generated by the induction coil can fully cut the graphite crucible to heat the graphite crucible, and the temperature of the graphite crucible can be used for heating non-metallic materials.

2. The improved induction heating furnace of claim 1, wherein: the shell comprises a first shell and a second shell arranged in the first shell, the first shell is a rectangular shell, the second shell is a cylindrical shell, and the induction coil connecting device, the air inlet and the air outlet are arranged on the side wall of the second shell.

3. The improved induction heating furnace of claim 2, wherein: the second shell comprises a second shell main body, a connector arranged on the outer side wall of the second shell main body and a plurality of support frames arranged in the second shell main body, and the heat-preservation shell is fixedly connected to the support frames.

4. The improved intermediate frequency induction heating furnace according to claim 3, wherein: the furnace body also comprises a thermocouple connected with the induction furnace body, and the thermocouple penetrates through the connector to be connected with the induction furnace body.

5. The improved induction heating furnace of claim 1, wherein: the axial length of the induction coil is equal to the axial length of the graphite crucible.

6. The improved induction heating furnace of claim 1, wherein: the induction coil comprises an induction coil body and two connecting pipes which are respectively connected to two ends of the induction coil body, the graphite crucible is contained in the induction coil body, the connecting pipes penetrate through the induction coil connecting device and are connected with the medium-frequency power supply cabinet, and the two connecting pipes are symmetrical to each other.

7. The improved intermediate frequency induction heating furnace according to claim 6, wherein: every the connecting pipe all include one with the first connecting pipe that induction coil main part one end is connected, one with the second connecting pipe that intermediate frequency power cabinet connects, and a setting is in first connecting pipe with arc connecting pipe between the second connecting pipe, the arc connecting pipe includes a first arc connecting pipe, and a second arc connecting pipe, first arc connecting pipe with second arc connecting pipe becomes central symmetry.

8. The improved induction heating furnace of claim 7, wherein: the first connecting pipe and the second connecting pipe are parallel to each other, and the extending direction of the first connecting pipe and the extending direction of the second connecting pipe are perpendicular to the central axis of the shell.

9. The improved induction heating furnace of claim 1, wherein: the induction coil connecting device comprises an insulating plate and two insulating seats arranged on the insulating plate, the insulating plate and the insulating seats are made of ceramics, and the connecting pipe penetrates through the insulating plate and the insulating seats to be connected with the intermediate-frequency power supply cabinet.

Technical Field

The invention belongs to the technical field of heating furnaces, and particularly relates to an improved medium-frequency induction heating furnace.

Background

The medium frequency induction heating furnace is a power supply device which converts power frequency 50Hz alternating current into medium frequency, converts three-phase power frequency alternating current into direct current after rectification, converts the direct current into adjustable medium frequency current, supplies medium frequency alternating current flowing through a capacitor and an induction coil, generates high-density magnetic lines in the induction coil, and cuts materials contained in the induction coil.

The current intermediate frequency induction heating furnace can not heat non-metallic materials and can not provide a vacuum environment, so that the intermediate frequency induction heating furnace has a single processed product and can not provide a suitable environment in the process of processing materials.

Disclosure of Invention

In view of the above, the present invention provides an improved medium frequency induction heating furnace capable of heating non-metallic materials to meet industrial requirements.

An improved intermediate frequency induction heating furnace comprises an intermediate frequency power supply cabinet and a heating device which is arranged on the intermediate frequency power supply cabinet and connected with the intermediate frequency power supply cabinet. The heating device comprises a furnace shell, an induction furnace body arranged in the furnace shell, and an induction coil surrounding the outer side of the induction furnace body. The induction coil and the induction furnace body are arranged at intervals. The furnace shell comprises a shell, a feeding device arranged on the shell, an induction coil connecting device arranged on the shell, and a gas replacement device which is used for vacuumizing the shell and is arranged on the side wall of the shell. The gas replacement device comprises a gas inlet and a gas outlet. The feeding device is arranged along the axial direction of the shell, and the central shaft of the feeding device is superposed with the central shaft of the induction furnace body. The induction furnace body comprises a heat-insulating shell fixedly connected in the furnace shell and a graphite crucible accommodated in the heat-insulating shell. The heat-insulating shell is made of one of inorganic asbestos and aluminum silicate. The graphite crucible is made of graphite. The heat preservation shell and the graphite crucible are arranged along the direction of the central shaft of the furnace shell, and the opening direction of the heat preservation shell and the opening direction of the graphite crucible face the feeding device. The axial length of the heat preservation shell is larger than that of the graphite crucible. The position of the induction coil surrounding the outer side of the heat preservation shell corresponds to the position of the graphite crucible, so that the alternating magnetic field generated by the induction coil can fully cut the graphite crucible to heat the graphite crucible, and the non-metal material can be heated by utilizing the temperature of the graphite crucible.

Further, the housing comprises a first housing and a second housing disposed in the first housing, the first housing is a rectangular housing, the second housing is a cylindrical housing, and the induction coil connecting device, the air inlet and the air outlet are disposed on a sidewall of the second housing.

Furthermore, the second shell comprises a second shell main body, a connector arranged on the outer side wall of the second shell main body, and a plurality of support frames arranged in the second shell main body, wherein the heat preservation shell is fixedly connected to the support frames.

Furthermore, the furnace body also comprises a thermocouple connected with the induction furnace body, and the thermocouple penetrates through the connector to be connected with the induction furnace body.

Further, the length of the induction coil in the axial direction is equal to the length of the graphite crucible in the axial direction.

Furthermore, the induction coil comprises an induction coil main body and two connecting pipes which are respectively connected to two ends of the induction coil main body, the graphite crucible is contained in the induction coil main body, the connecting pipes penetrate through the induction coil connecting device and are connected with the medium-frequency power supply cabinet, and the two connecting pipes are symmetrical to each other.

Further, every the connecting pipe all include one with the first connecting pipe that induction coil main part one end is connected, one with the second connecting pipe that intermediate frequency power supply cabinet is connected, and one sets up first connecting pipe with arc connecting pipe between the second connecting pipe, arc connecting pipe includes a first arc connecting pipe, and a second arc connecting pipe, first arc connecting pipe with second arc connecting pipe becomes central symmetry.

Furthermore, the first connecting pipe and the second connecting pipe are parallel to each other, and the extending direction of the first connecting pipe and the extending direction of the second connecting pipe are perpendicular to the central axis of the housing.

Furthermore, the induction coil connecting device comprises an insulating plate and two insulating seats arranged on the insulating plate, the insulating plate and the insulating seats are made of ceramics, and the connecting pipe penetrates through the insulating plate and the insulating seats to be connected with the intermediate frequency power supply cabinet.

Compared with the prior art, the improved induction furnace body in the medium-frequency induction heating furnace can heat both metal materials and non-metal materials. The induction furnace body comprises a heat-insulating shell fixedly connected in the furnace shell and a graphite crucible accommodated in the heat-insulating shell. Wherein the graphite crucible is made of graphite. And the induction coil is wound around the outside of the induction furnace body. When the induction heating device works, the alternating magnetic field generated by the induction coil cuts the graphite crucible, so that the graphite crucible generates eddy current to generate heat. When a non-metallic material is heated, the alternating magnetic field generated by the induction coil cuts the graphite crucible and the non-metallic material, only the graphite crucible generates eddy current heating, and the graphite crucible transfers heat to the non-metallic material, thereby heating the non-metallic material. When heating metal material, the alternating magnetic field that induction coil produced cuts graphite crucible and metal material make graphite crucible and metal material are all heated, moreover graphite crucible gives metal material with heat transfer, has improved heating efficiency. In addition, the gas replacement device can pump out air in the second shell or fill inert gas into the second shell through the gas replacement device, so that the second shell becomes an inert gas environment, and the material processing requirement is met. The improved intermediate frequency induction heating furnace not only improves the heating efficiency of the metal material, but also can control the gas in the heating environment and heat the non-metal material.

Drawings

Fig. 1 is a schematic structural diagram of an improved intermediate frequency induction heating furnace provided by the invention.

Fig. 2 is a schematic sectional view of the improved intermediate frequency induction heating furnace of fig. 1.

Fig. 3 is a schematic structural view of an induction coil in the improved medium frequency induction heating furnace of fig. 2.

Detailed Description

Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.

As shown in fig. 1 to fig. 3, which are schematic structural diagrams of the improved intermediate frequency induction heating furnace provided by the present invention. The improved medium-frequency induction heating furnace comprises a medium-frequency power supply cabinet 10 and a heating device 20 arranged on the medium-frequency power supply cabinet 10. The improved if induction heating furnace further includes other functional modules, such as assembly components, electrical components, etc., which should be known to those skilled in the art, and will not be described in detail herein.

The intermediate frequency power supply cabinet 10 supplies power to the heating device 20, and a cooling device. The intermediate frequency power supply cabinet 10 converts a power frequency 500Hz alternating current into a power supply device with an intermediate frequency to 20KHz, converts a three-phase power frequency alternating current into a direct current after rectification, and then converts the direct current into an adjustable intermediate frequency current, which is a prior art and is not described herein again.

The heating device 20 includes a furnace shell 21, an induction furnace body 22 disposed in the furnace shell 21, an induction coil 23 surrounding the induction furnace body 22, and a thermocouple 24 connected to the induction furnace body 22. When the medium-frequency power supply cabinet 10 is used, the medium-frequency power supply cabinet 10 is a power supply device for converting power frequency 500Hz alternating current into medium frequency to 20KHz, converts three-phase power frequency alternating current into direct current after rectification, converts the direct current into adjustable medium frequency current, supplies the adjustable medium frequency alternating current to the induction coil 23, generates high-density magnetic lines in the induction coil 23, cuts the induction furnace body 22 in the induction coil 23 and materials contained in the induction furnace body 22, and generates eddy currents in the induction furnace body 22 and the materials. The eddy current also has some properties of medium frequency current, that is, free electrons of the material flow in the material with resistance to generate heat.

The furnace casing 21 comprises a housing 211, a feeding device 212 disposed on the housing 211, an induction coil connecting device 213 disposed on the housing 211, and a gas replacement device 214 for evacuating the inside of the housing 211 and disposed on the side wall of the housing 211.

The housing 211 includes a first housing 2111, and a second housing 2112 disposed within the first housing 2111. The induction coil connecting device 213, and the air inlet 2141 and the air outlet 2142 are disposed on a side wall of the second housing 2112. In this embodiment, the first housing 2111 is a rectangular housing, and the second housing 2112 is a cylindrical housing. The second housing 2112 includes a second housing main body 2113, a connecting head 2114 disposed on the outer side wall of the second housing main body 2113, and a plurality of supporting frames 2115 disposed in the second housing main body 2113, and the heat-insulating housing 22 is fixedly connected to the supporting frames 2115, so that the induction furnace body 22 is fixed in the second housing 2112.

The feeding device 212 is disposed along the axial direction of the housing 211, and the central axis of the feeding device 212 coincides with the central axis of the induction furnace body 22, so as to place a heating material into the induction furnace body 22.

The induction coil connecting device 213 includes an insulating plate 2131 and two insulating bases 2132 disposed on the insulating plate 2131, wherein the insulating plate 2131 and the insulating bases 2132 are made of ceramic to prevent the induction coil connecting device 213 from being damaged by the alternating magnetic field generated by the induction coil 23.

The gas replacement device 214 includes a gas inlet 2141 and a gas outlet 2142. The gas replacement device 214 may evacuate air from the second housing 2112, or fill the second housing 2112 with an inert gas through the gas replacement device 214, so that the second housing 2112 becomes an inert gas environment, thereby meeting the material processing requirements. When the gas replacement device 214 extracts air in the second housing 2112, the air inlet 2141 is closed, the air outlet 2142 is opened, and air in the furnace shell 21 is extracted, so that a vacuum chamber is formed in the housing 211, no air reacts with the material in the furnace shell 21, the performance of the processed material is maintained, and the heat effect of the heating furnace is improved. After the material in the furnace shell 21 is heated, the gas inlet 2141 is opened, and the gas outlet 2142 is closed, so that the internal and external pressures of the furnace shell 21 are consistent, and the material can be taken out by opening the feeding device 212. If the inert gas is introduced into the second housing 2112 through the gas replacement device 214 and is replaced with the air in the second housing 2112, the gas replacement device 214 first extracts the air in the second housing 2112 to form a vacuum state, so that the second housing 2112 becomes a vacuum chamber, and when the vacuum degree in the second housing 2112 reaches a minimum value, the extraction of the air in the second housing 2112 is stopped, the inert gas is filled into the second housing 2112, and the inert gas in the second housing 2112 reaches an atmospheric pressure.

The induction furnace body 22 comprises a heat-insulating shell 221 fixedly connected in the furnace shell 21, and a graphite crucible 222 accommodated in the heat-insulating shell 221.

The heat insulating housing 221 is used for supporting the graphite crucible 222 in the induction coil 23, so that the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222. When the alternating magnetic field generated by the induction coil 23 cuts the heat-insulating casing 221, the external alternating magnetic field does not generate eddy current inside the heat-insulating casing 221, so that the heat-insulating casing 221 does not generate heat. The heat-insulating casing 221 is made of one of inorganic asbestos and aluminum silicate, and both the inorganic asbestos and the aluminum silicate are heat-insulating materials, so that the heat-insulating casing 221 achieves a heat-insulating effect, and the heat-insulating casing 221 effectively reduces heat diffusion of the graphite crucible 222, thereby performing a heat-insulating effect on the graphite crucible 222.

The graphite crucible 222 is made of graphite, and the graphite crucible 222 has good thermal conductivity and high temperature resistance. The axial length of the thermal insulation casing 221 is greater than the axial length of the graphite crucible 222, so that the graphite crucible 222 is accommodated in the thermal insulation casing 221. The heat-insulating casing 221 and the graphite crucible 222 are both arranged along the central axis direction of the furnace shell 22, and the opening direction of the heat-insulating casing 221 and the opening direction of the graphite crucible 222 both face the feeding device 212, so that materials can be conveniently put into the graphite crucible 222 through the feeding device 212. The length of the induction coil body 231 in the axial direction is equal to the length of the graphite crucible 222 in the axial direction, and the position of the induction coil 23 surrounding the outer side of the thermal insulation casing 221 corresponds to the position of the graphite crucible 222, so that the alternating magnetic field generated by the induction coil 23 can cut the graphite crucible 222 sufficiently to heat the graphite crucible 222, and can heat the non-metal material by using the temperature of the graphite crucible 222. When the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222, the external alternating magnetic field generates eddy current in the graphite crucible 222 to heat the graphite crucible 222, and the graphite crucible 222 itself can generate heat, and the graphite crucible 222 can heat the material contained in the graphite crucible 222 by using its temperature. When the material contained in the graphite crucible 222 is a non-metal material, the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222 and the non-metal material, only the graphite crucible 222 is affected, the graphite crucible 222 is heated under the influence of the alternating magnetic field generated by the induction coil 23, and the heat of the graphite crucible 222 is transferred to the non-metal material, so that the non-metal material is heated. When the material contained in the graphite crucible 222 is a metal material, the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222 and the metal material, so that both the graphite crucible 222 and the metal material are heated, and the heat generated by the graphite crucible 222 is transferred to the metal material, thereby improving the heating efficiency. When the low melting point metal material is heated, the metal material is accommodated by the container, and the container accommodating the metal material is placed in the graphite crucible 222, and the container used is a platinum crucible, and when the heated material is a high melting point metal material, the metal material is directly heated by the graphite crucible 222. When heating the non-metallic material, the non-metallic material may be directly placed in the graphite crucible 222. And the graphite crucible 222 is in a vacuum environment or an inert gas environment whenever a metallic material or a non-metallic material is heated, so as to ensure the life of the graphite crucible 222.

The induction coil 23 includes an induction coil body 231, and two connection pipes 232 respectively connected to both ends of the induction coil body 231. The induction furnace body 22 is inserted into the induction coil main body 231, the axial length of the induction coil main body 231 is smaller than the axial length of the heat-insulating housing 221, the axial length of the induction coil main body 231 is equal to the axial length of the graphite crucible 222, and the position of the induction coil main body 231 corresponds to the position of the graphite crucible 222, so as to sufficiently heat the material in the graphite crucible 222. In addition, the two connection pipes 232 are respectively connected to two ends of the induction coil main body 231, and the intermediate frequency power supply cabinet 10 is communicated with the induction coil main body 231 through the connection pipes 232. The connection pipe 232 passes through the induction coil connection device 213 to be connected to the if power cabinet 10. The connection pipe 232 passes through the insulation plate 2131 and the insulation seat 2132 and is connected to the if power cabinet 10. The two connection pipes 232 are symmetrical to each other.

Each of the connection pipes 232 includes a first connection pipe 2321 connected to one end of the induction coil body 231, a second connection pipe 2322 connected to the intermediate frequency power supply cabinet 10, and an arc connection pipe 2323 disposed between the first connection pipe 2321 and the second connection pipe 2322, the arc connection pipe 2323 includes a first arc connection pipe 2324 and a second arc connection pipe 2325, and the first arc connection pipe 2324 and the second arc connection pipe 2325 are centrally symmetrical to prevent local eddy currents from being generated at a connection position of the induction coil body 231 and the connection pipe 232, thereby preventing the induction coil 23 from being damaged. The first connection pipe 2321 and the second connection pipe 2322 are parallel to each other, and the extending direction of the first connection pipe 2321 and the extending direction of the second connection pipe 2322 are perpendicular to the central axis of the housing 211.

The thermocouple 24 is a temperature measuring element commonly used in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument, which is a prior art. The thermocouple 24 is connected with the induction furnace body 22 and is used for detecting the temperature of the induction furnace body 22 so as to control the temperature in the induction furnace body 22. And the thermocouple 24 passes through the connecting head 2114 to be connected with the induction furnace body 22.

Compared with the prior art, the induction furnace body 22 in the improved medium-frequency induction heating furnace provided by the invention can heat both metal materials and non-metal materials. The induction furnace body 222 comprises a heat-insulating shell 221 fixedly connected in the furnace shell 21, and a graphite crucible 222 accommodated in the heat-insulating shell 221. Wherein the graphite crucible 222 is made of graphite. And the induction coil 23 is wound around the outside of the induction furnace body 22. When the induction heating device works, the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222, so that the graphite crucible 222 generates eddy current and generates heat. When a non-metallic material is heated, the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222 and the non-metallic material, only the graphite crucible 222 generates eddy current heat, and the graphite crucible 222 transfers the heat to the non-metallic material, thereby heating the non-metallic material. When the metal material is heated, the alternating magnetic field generated by the induction coil 23 cuts the graphite crucible 222 and the metal material, so that the graphite crucible 222 and the metal material are both heated, and the graphite crucible 222 transfers heat to the metal material, thereby improving the heating efficiency. In addition, the gas replacement device 214 may evacuate air from the second housing 2112 or fill the second housing 2112 with an inert gas through the gas replacement device 214, so that an inert gas atmosphere is provided in the second housing 2112, thereby providing a suitable atmosphere for the processing material in the second housing 2112. The improved intermediate frequency induction heating furnace not only improves the heating efficiency of the metal material, but also can control the gas in the heating environment and heat the non-metal material.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.