Same-frequency and same-direction electromagnetic induction heating system

Abstract

The utility model discloses a same-frequency same-direction electromagnetic induction heating system, which belongs to the field of induction heating and comprises a tank body, a support table arranged at the bottom in the tank body, a graphite crucible arranged on the support table, a heat insulation layer arranged on the outer side of the graphite crucible, and a plurality of coils sequentially arranged outside the heat insulation layer along the height direction of the graphite crucible. A plurality of coil fixing insulating plates are circumferentially arranged on the inner wall of the tank body, and the plurality of coils are fixed through the coil fixing insulating plates; a support frame is arranged on one side of the tank body, a plurality of support platforms are arranged on the support frame at different heights, power supply cabinets are supported on the plurality of support platforms, inverter power supplies are arranged in the power supply cabinets, each inverter power supply is correspondingly connected with one coil through a cable, and the plurality of inverter power supplies adopt a common-frequency series resonance mode. According to the structure, the multiple induction heating coils are powered by the independent inverter power supplies, the multiple inverter power supplies adopt a common-frequency series resonance mode, the same-frequency and same-phase requirement of the multiple induction heating coils is met, and the interference problem does not exist in the simultaneous operation process.

Description

Technical Field

[0001] The utility model relates to the field of induction heating, in particular to an electromagnetic induction heating system with the same frequency and direction. Background Art

[0002] The chemical industry needs to carry out physical or chemical reactions in large, sealed tanks to obtain the desired substances and structures. During the reaction, heating is often required for catalysis. Due to the particularity of the chemical industry, the two commonly used methods are inert gas heating and electromagnetic induction heating.

[0003] The cost of inert gas heaters is too high; inert gas must be produced and electrical heating must be performed, and gas is a poor conductor of heat and consumes a lot of energy; and if inert gas is used, ventilation pipes must be welded, which requires a large initial investment cost.

[0004] If electromagnetic induction heating technology is used with only one device, uneven heating will occur and temperature control cannot be performed in sections; if multiple devices are used for heating at the same time, mutual interference will occur between the devices, causing unstable operation of the devices.

[0005] In view of the above problems, the utility model designs and manufactures an electromagnetic induction heating system with the same frequency and direction to overcome the above defects. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides an electromagnetic induction heating system with the same frequency and phase, in which multiple induction heating coils are powered by a separate inverter power supply. The multiple inverter power supplies adopt a common frequency series resonance mode to ensure that the multiple induction heating coils have the same frequency and phase, and there is no interference problem during simultaneous operation.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: an electromagnetic induction heating system with the same frequency and direction, comprising a tank body, a support platform is provided at the bottom of the tank body, a graphite crucible is provided on the support platform, an insulation layer is provided on the outside of the graphite crucible, a plurality of coils are sequentially provided outside the insulation layer along the height direction of the graphite crucible, a plurality of coil fixing insulating plates are provided on the circumference of the inner wall of the tank body, and the plurality of coils are fixed by the coil fixing insulating plates;

[0008] A support frame is provided on one side of the tank body, and several support platforms are provided at different heights on the support frame. Power cabinets are supported on several support platforms. The number of power cabinets is consistent with the number of coils. An inverter power supply is provided in the power cabinet. Each inverter power supply is connected to a corresponding coil through a cable, and several inverter power supplies adopt a common frequency series resonance method.

[0009] Preferably, a magnetic yoke is provided on the inner wall of the tank body corresponding to each coil position.

[0010] Preferably, the graphite crucible is provided with two layers, inner and outer layers.

[0011] Preferably, the height position of the support platform is close to the height position of the coil to be connected.

[0012] Preferably, a DCS system is also included, and the working status and operating power of each inverter power supply are transmitted to the DCS system via a 4-20mA signal.

[0013] Preferably, it further comprises a rectifying part, and a chopper is provided between the rectifying part and the inverter power supply.

[0014] Preferably, the DCS system adjusts the power output of each inverter power supply by adjusting the duty cycle through a chopper.

[0015] The utility model is beneficial in that:

[0016] 1. Since the adjacent coils of the utility model have the same frequency and phase, there is no interference problem when multiple coils are running simultaneously, thus ensuring the stability of the coil heating process.

[0017] 2. The utility model can flexibly control the output of multiple coil powers according to demand to meet the heating temperature requirements of the corresponding positions of different coils.

[0018] 3. The utility model can heat quickly and configure the corresponding power according to the needs. The greater the power, the shorter the heating time.

[0019] 4. Compared with the inert gas heater, the utility model is pollution-free and energy-saving, and has high energy conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of an electromagnetic induction heating system with the same frequency and direction;

[0021] Figure 2 It is a partial cross-sectional view of an electromagnetic induction heating system with the same frequency and direction;

[0022] Figure 3 It is a partially cutaway stereoscopic diagram of an electromagnetic induction heating system with the same frequency and direction.

[0023] In the figure: 1-tank body, 2-support table, 3-support frame, 4-support platform, 5-power cabinet, 6-cable, 7-yoke, 8-coil fixing insulation board, 9-insulation layer, 10-graphite crucible, 11-coil. DETAILED DESCRIPTION

[0024] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 3 As shown, a same-frequency and same-direction electromagnetic induction heating system comprises a tank body 1, a support platform 2 is provided at the bottom of the tank body 1, a graphite crucible 10 is provided on the support platform 2, the graphite crucible 10 is preferably provided with an inner and outer two layers, an insulation layer 9 is provided on the outer side of the graphite crucible 10, a plurality of coils 11 are sequentially provided outside the insulation layer 9 along the height direction of the graphite crucible 10, a plurality of coil 11 fixing insulating plates 8 are provided on the circumference of the inner wall of the tank body 1, and the plurality of coils 11 are fixed by the coil 11 fixing insulating plates 8;

[0026] A support frame 3 is provided on one side of the tank body 1, and several support platforms 4 are provided at different heights on the support frame 3. Power cabinets 5 are supported on the several support platforms 4. The number of power cabinets 5 is consistent with the number of coils 11. An inverter power supply is provided in the power cabinet 5. Each inverter power supply is connected to a corresponding coil 11 through a cable 6. Several inverter power supplies adopt a common frequency series resonance method to ensure that multiple coils 11 have the same frequency and phase. There is no interference problem when multiple coils 11 are running at the same time, which ensures the stability of the heating process of the coil 11.

[0027] A magnetic yoke 7 is provided on the inner wall of the tank 1 corresponding to each coil 11 , and the height of the support platform 4 is close to that of the coil 11 to be connected, so as to avoid the influence of the same frequency and phase due to the large difference in the length of the cable 6 .

[0028] The utility model also includes a DCS system, and the working status and operating power of each inverter power supply are transmitted to the DCS system through a 4-20mA signal. It also includes a rectifier part, which adopts a fully open diode rectifier and maintains the stability of the DC voltage through a large-capacity filter capacitor. A chopper is provided between the rectifier part and the inverter power supply, and the DCS system adjusts the duty cycle through the chopper to adjust the power output of each inverter power supply. The utility model can flexibly control the power of each area through temperature feedback to ensure the uniformity of the overall temperature, and can also flexibly control the power output of multiple coils 11 according to demand to meet the heating temperature requirements of the corresponding positions of different coils 11.

[0029] It should be understood that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. An electromagnetic induction heating system with the same frequency and direction, characterized in that: It comprises a tank body, wherein a support platform is provided at the bottom of the tank body, a graphite crucible is provided on the support platform, a heat preservation layer is provided on the outside of the graphite crucible, a plurality of coils are sequentially provided outside the heat preservation layer along the height direction of the graphite crucible, a plurality of coil fixing insulating plates are provided on the circumference of the inner wall of the tank body, and the plurality of coils are fixed by the coil fixing insulating plates; A support frame is provided on one side of the tank body, and several support platforms are provided at different heights on the support frame. Power cabinets are supported on several support platforms. The number of power cabinets is consistent with the number of coils. An inverter power supply is provided in the power cabinet. Each inverter power supply is connected to a corresponding coil through a cable, and several inverter power supplies adopt a common frequency series resonance method.

2. The electromagnetic induction heating system with the same frequency and direction as claimed in claim 1, characterized in that: A magnetic yoke is provided on the inner wall of the tank corresponding to each coil position.

3. The electromagnetic induction heating system with same frequency and same direction according to claim 1, characterized in that: The graphite crucible is provided with two layers, inner and outer layers.

4. The electromagnetic induction heating system with same frequency and same direction according to claim 1, characterized in that: The height position of the supporting platform is close to the height position of the coil to be connected.

5. The electromagnetic induction heating system with same frequency and same direction according to claim 1, characterized in that: It also includes a DCS system, and the working state and operating power of each inverter power supply are transmitted to the DCS system via a 4-20mA signal.

6. The electromagnetic induction heating system with same frequency and same direction according to claim 5, characterized in that: It also includes a rectifying part, and a chopper is arranged between the rectifying part and the inverter power supply.

7. The electromagnetic induction heating system with same frequency and same direction according to claim 6, characterized in that: The DCS system adjusts the duty cycle by means of a chopper to adjust the power output of each inverter power supply.

Images