Multi-point temperature measurement feedback induction heating equipment and temperature equalization method

Abstract

The invention provides multi-point temperature measurement feedback induction heating equipment which comprises a furnace body, at least one or three heating systems are arranged in the furnace body, and each heating system comprises a plurality of temperature detectors installed at different positions of the furnace body, a plurality of induction heating coils surrounding the furnace body, an insulating plate fixed outside the furnace body and a medium-frequency alternating-current power supply unit. According to the multi-point temperature measurement feedback induction heating equipment, the design of the induction heating coils allows the coils to be connected in series or in parallel by using bolts, nuts and metal plates on the insulating plates. The invention further provides an induction heating equipment temperature balancing method based on point temperature measurement feedback. By adjusting the series-parallel configuration of the induction heating coils, more uniform temperature distribution can be realized in the furnace body, and particularly, the problem of non-uniform temperature in the traditional induction heating technology is solved at the upper end, the lower end and the middle part of the furnace body.

Description

Technical Field

[0001] The invention relates to the technical field of metal induction heating, and in particular to an induction heating device with multi-point temperature measurement feedback and a temperature balancing method. Background Art

[0002] In existing metal processing heating systems, traditional induction heating technology faces the problem of difficult to control temperature uniformity. Specifically, these systems often cause uneven temperature distribution in the heating area during the heating process, especially at the upper and lower ends and the middle part of the heating tank. This temperature non-uniformity will affect the quality and efficiency of metal processing, because the heating temperature of the metal has a direct impact on its subsequent processing performance.

[0003] Traditional induction heating coil designs usually adopt a fixed layout, and the winding density and current distribution of the coil remain unchanged throughout the heating process. Induction heating relies on the alternating magnetic field to generate eddy currents in the conductive material to heat. Although in theory a uniform magnetic field density can lead to uniform heating, in practice the upper and lower ends of the furnace are usually closer to the environment, so the heat dissipation rate is faster. This means that even if the magnetic field density is uniform, the temperature in these areas may be lower than the temperature in the middle of the furnace due to the rapid heat dissipation.

[0004] In the prior art, in order to solve the problem of temperature imbalance during induction heating, there is indeed a method of changing the magnetic field density by physically adjusting the coil gap. This method allows the operator to manually adjust the tightness of the coil according to the heating requirements, thereby affecting the strength of the magnetic field and the heating effect. However, the design of the furnace body does not allow such physical adjustment at any time, because it is necessary to coat the induction coil with insulating material, which limits the direct operation of the coil. Based on the above, the present application proposes an induction heating device with multi-point temperature measurement feedback and a temperature equalization method to solve the problem of large temperature equalization differences. Summary of the invention

[0005] The present invention provides an induction heating device with multi-point temperature measurement feedback, which solves the problems mentioned in the above background technology.

[0006] The technical solution of the present invention is achieved in this way:

[0007] An induction heating device with multi-point temperature measurement feedback comprises a furnace body, wherein the furnace body is provided with a plurality of heating systems, wherein the heating systems comprise a plurality of temperature detectors installed at different positions of the furnace body, at least one or three induction heating coils surrounding the furnace body, an insulating plate fixed to the outside of the furnace body, and a medium frequency AC power supply unit;

[0008] The plurality of induction heating coils are arranged from top to bottom, and a notch is formed on the induction heating coil to form an open induction heating coil, and the notch corresponds to the insulating plate; the end of the notch of the induction heating coil is connected to the end of the notch of the adjacent induction heating coil on the insulating plate by arranging bolts, nuts and metal plates to form a series or parallel circuit configuration;

[0009] The input end of the first induction heating coil is electrically connected to the output end of the medium frequency AC power supply unit, and the output end of the last induction heating coil is electrically connected to the input end of the medium frequency AC power supply unit.

[0010] Furthermore, water pipes are provided at both ends of the induction heating coil, one of which is a water inlet pipe and the other is a water outlet pipe.

[0011] Furthermore, a cage is provided outside the furnace body, the top of the cage has an opening, and the top of the furnace body extends to the opening.

[0012] Furthermore, the cage is also provided with a plurality of magnetic yokes distributed outside the furnace body.

[0013] Furthermore, a demagnetization ring is provided at the top opening of the cage.

[0014] A temperature balancing method for an induction heating device with multi-point temperature measurement feedback is provided, and the method uses the induction heating device with multi-point temperature measurement feedback, and comprises the following steps:

[0015] S1. Install multiple temperature detectors inside the furnace, each temperature detector is configured at a predetermined monitoring point to monitor the temperature inside the furnace in real time;

[0016] S2. The temperature data collected by the temperature detector is transmitted to the user interface in real time so that the staff can monitor the temperature distribution inside the furnace;

[0017] S3. The staff identifies the areas in the furnace where the temperature is too high or too low based on the temperature data displayed on the user interface;

[0018] S4. For a single heating system, the staff adjusts the series-parallel configuration between the induction heating coils of each system according to the temperature data:

[0019] If the temperature in a certain area is too low, the coils of the corresponding heating system are connected in series to concentrate the magnetic field and heat to that area;

[0020] If the temperature in a certain area is too high, the coils of the corresponding heating system are connected in parallel to disperse the magnetic field and heat and reduce the temperature in that area;

[0021] For three heating systems, the series and parallel configurations of each system can be selectively adjusted according to the temperature distribution to achieve a more complex temperature balancing strategy;

[0022] Series configuration: Two or more induction heating coils are connected end to end so that current passes through each coil in turn to concentrate the magnetic field and increase the temperature in a specific area;

[0023] Parallel configuration: connecting the corresponding ends of two or more induction heating coils to each other so that the current is divided among multiple coils to disperse the magnetic field and reduce the temperature in a specific area;

[0024] S5. Dynamically adjust the series or parallel state of the induction heating coils to respond to temperature changes and maintain temperature balance inside the furnace;

[0025] S6. The staff continuously monitors the temperature and adaptively executes steps S3 to S5 based on the feedback from the user interface to ensure that the temperature difference inside the furnace is maintained at around 100°C.

[0026] Beneficial effects of the technical solution provided by this application:

[0027] 1. The design of the induction heating coil of the multi-point temperature measurement feedback induction heating equipment allows the coils to be connected in series or in parallel by using bolts, nuts and metal plates on the insulating plate. This design allows the staff to manually adjust the connection mode of the coils according to the actual temperature distribution and heating requirements, thereby flexibly controlling the density of the magnetic field and the distribution of heat.

[0028] 2. The temperature balancing method of the induction heating equipment with multi-point temperature measurement feedback can achieve a more uniform temperature distribution in the furnace body by adjusting the series-parallel configuration of the induction heating coils, especially at the upper and lower ends and the middle part of the furnace body, thereby solving the problem of uneven temperature in traditional induction heating technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a partial schematic diagram of Embodiment 2 of the induction heating device with multi-point temperature measurement feedback of the present invention;

[0031] Figure 2 It is a partial schematic diagram of Embodiment 1 of the induction heating device with multi-point temperature measurement feedback of the present invention;

[0032] Figure 3 It is a top view schematic diagram of the induction heating device with multi-point temperature measurement feedback of the present invention;

[0033] Figure 4For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0034] Figure 5 It is a schematic diagram of the induction heating equipment with multi-point temperature measurement feedback of the present invention.

[0035] In the figure: 100 furnace body, 200 heating system, 210 temperature detector, 220 induction heating coil, 221 notch, 222 bolt, 223 nut, 224 metal plate, 225 water pipe, 230 insulating plate, 240 medium frequency AC power supply unit; 300 cage, 310 yoke, 320 demagnetizing ring. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Reference Figure 1-5 The induction heating device with multi-point temperature measurement feedback comprises a furnace body 100, wherein the furnace body 100 is provided with at least one or three heating systems 200, wherein the heating system 200 comprises a plurality of temperature measuring devices 210 installed at different positions of the furnace body 100, a plurality of induction heating coils 220 surrounding the furnace body 100, an insulating plate 230 fixed to the outside of the furnace body 100, and a medium frequency AC power supply unit 240; the plurality of induction heating coils 220 are arranged from top to bottom, and the induction heating coils 220 have notches 221 to form an open induction heating The induction heating coil 220 has a notch 221 corresponding to the insulating plate 230; the end of the notch 221 of the induction heating coil 220 is connected to the end of the notch 221 of the adjacent induction heating coil 220 on the insulating plate 230 by setting a bolt 222, a nut 223 and a metal plate 224 to form a series or parallel circuit configuration; the input end of the first induction heating coil 220 is electrically connected to the output end of the medium frequency AC power supply unit, and the output end of the last induction heating coil 220 is electrically connected to the input end of the medium frequency AC power supply unit.

[0038] By installing multiple temperature detectors 210 inside the furnace body 100, the present invention realizes real-time multi-point monitoring of the temperature inside the furnace and improves the perception of temperature changes during the heating process. The design of the induction heating coil 220 allows the series or parallel connection between the coils to be achieved by using bolts 222, nuts 223 and metal plates 224 on the insulating plate 230. This design allows the staff to manually adjust the connection mode of the coil according to the actual temperature distribution and heating requirements, thereby flexibly controlling the density of the magnetic field and the distribution of heat. The present invention allows the staff to dynamically adjust the connection mode of the heating coil according to real-time feedback, ensure the temperature balance inside the furnace body 100, respond to temperature changes and maintain the temperature balance inside the furnace body. By adjusting the series-parallel configuration of the induction heating coil 220, the present invention can achieve a more uniform temperature distribution in the furnace body, especially at the upper and lower ends and the middle part of the furnace body, solving the problem of uneven temperature in traditional induction heating technology.

[0039] In some embodiments, water pipes 225 are provided at both ends of the induction heating coil 220, one of which is a water inlet pipe and the other is a water outlet pipe.

[0040] The induction heating coil generates a large amount of heat during operation. By arranging water pipes 225 at both ends of the coil, one of which is a water inlet pipe and the other is a water outlet pipe, an effective cooling circulation system can be formed. Such a design helps to take away the heat generated by the coil in time to prevent the coil from overheating, thereby protecting the coil from thermal damage and extending its service life. The existence of the cooling system ensures that the induction heating coil can maintain stable performance under continuous high-load operation. By maintaining the temperature of the coil within a safe range, the performance degradation or failure of the coil caused by excessive temperature can be avoided, ensuring the continuity and uniformity of the heating process. An overheated coil may cause the insulating material to age or even burn, posing a safety hazard. The setting of the water pipe 225 not only protects the coil, but also reduces the safety risks caused by equipment failure, and enhances the safety of the entire induction heating system 200.

[0041] In some embodiments, a cage frame 300 is disposed outside the furnace body 100 , the cage frame 300 has an opening at the top, and the top of the furnace body 100 extends to the opening.

[0042] The design of the cage 300 provides additional support and stability for the furnace body 100. Under high temperature and heavy load working conditions, the furnace body may deform or shift. The presence of the cage 300 can effectively reduce these situations and ensure the stability of the furnace body and the accuracy of the heating process. During the induction heating process, the management of the magnetic field is crucial for heating efficiency and uniformity. The cage 300 and the opening on the top may help guide and control the magnetic field, reduce the interference of the magnetic field on the surrounding environment, and also reduce the magnetic field interference between different areas inside the furnace body.

[0043] In some embodiments, the cage 300 is further provided with a plurality of magnetic yokes 310 distributed outside the furnace body 100 .

[0044] The function of the yoke 310 is to concentrate and guide the magnetic field generated by the induction heating coil 220. By distributing multiple yokes in the cage 300, the distribution of the magnetic field can be more effectively controlled to ensure that the magnetic field is mainly concentrated in the heating area inside the furnace body 100, thereby improving the heating efficiency and uniformity. The yoke 310 helps to limit the spread of the magnetic field outward and reduce the magnetic field interference with surrounding equipment, which is crucial for protecting other sensitive equipment in the working environment and ensuring the safety of operators. The concentrated magnetic field can more effectively generate eddy currents inside the furnace body, thereby accelerating the heating speed of the metal. This improved efficiency can reduce the heating time and improve production efficiency.

[0045] In some embodiments, a demagnetizing ring 320 is provided at the top opening of the cage 300 .

[0046] The demagnetizing ring 320 is installed at the opening on the top of the cage 300. Its main function is to close the magnetic field of the furnace body 100 and prevent the magnetic field from leaking from the opening to the external environment. This ensures that the magnetic field is mainly concentrated inside the furnace body, improves heating efficiency, and reduces electromagnetic interference to surrounding equipment. The demagnetizing ring 320 helps maintain the magnetic field strength inside the furnace body, so that the magnetic field generated by the induction heating coil 220 is more evenly distributed inside the furnace body, thereby improving the uniformity of heating and product quality.

[0047] A temperature balancing method for an induction heating device with multi-point temperature measurement feedback is provided, and the method uses the induction heating device with multi-point temperature measurement feedback, and comprises the following steps:

[0048] S1. A plurality of temperature detectors 210 are installed inside the furnace 100, each temperature detector 210 is configured at a predetermined monitoring point to monitor the temperature in the furnace in real time;

[0049] S2. The temperature data collected by the temperature detector 210 is transmitted to the user interface in real time for the staff to monitor the temperature distribution inside the furnace 100;

[0050] S3. The staff identifies the areas in the furnace where the temperature is too high or too low based on the temperature data displayed on the user interface;

[0051] S4. For a single heating system 200, the staff adjusts the series-parallel configuration between the induction heating coils 220 of each system according to the temperature data:

[0052] If the temperature in a certain area is too low, the coils of the corresponding heating system are connected in series to concentrate the magnetic field and heat to that area;

[0053] If the temperature in a certain area is too high, the coils of the corresponding heating system are connected in parallel to disperse the magnetic field and heat and reduce the temperature in that area;

[0054] For three heating systems, the series and parallel configurations of each system can be selectively adjusted according to the temperature distribution to achieve a more complex temperature balancing strategy;

[0055] Series configuration: two or more induction heating coils 220 are connected end to end so that current passes through each coil in turn to concentrate the magnetic field and increase the temperature in a specific area;

[0056] Parallel configuration: connecting the corresponding ends of two or more induction heating coils 220 to each other so that the current is divided among the multiple coils to disperse the magnetic field and reduce the temperature of a specific area;

[0057] S5. Dynamically adjust the series or parallel state of the induction heating coil 220 to respond to temperature changes and maintain a balanced temperature inside the furnace 100;

[0058] S6. The staff continuously monitors the temperature and adaptively executes steps S3 to S5 according to the feedback from the user interface to ensure that the temperature difference inside the furnace body 100 is maintained at about 100°C.

[0059] Example 1

[0060] For a single heating system 200, in order to reduce the frequency of adjusting the series and parallel connection of the induction heating coils 220 and the manual labor, it is ensured that the energy difference of the initial temperature in the furnace is small.

[0061] Furnace top: By connecting 3 to 5 turns of induction heating coils 220 end to end in series, current flows continuously in these coils to generate a concentrated magnetic field. The series coils increase the inductance, thereby generating a higher magnetic field density in the furnace top area.

[0062] Upper part of the furnace: The induction heating coils 220 are connected in parallel in pairs, and the current is divided among these coils. The magnetic field is more dispersed in this area, and the magnetic field density is relatively low.

[0063] In the furnace: three corresponding induction heating coils 220 are connected in parallel and then in series. This configuration increases the concentration of the magnetic field through series connection while maintaining a certain dispersion, forming a medium-density magnetic field area.

[0064] Lower half of the furnace: Similar to the upper half of the furnace, the induction heating coils 220 are connected in parallel in pairs to further disperse the magnetic field, and the magnetic field density is relatively low.

[0065] Furnace bottom: The last 2 to 3 turns of induction heating coils 220 are connected end to end in series to concentrate the magnetic field again and generate a higher magnetic field density.

[0066] That is, the furnace body is divided into:

[0067] Furnace top: concentrated magnetic field → upper half of furnace: relatively dispersed magnetic field → middle of furnace: dispersed magnetic field → lower half of furnace: relatively dispersed magnetic field → furnace bottom: relatively concentrated magnetic field.

[0068] Induction heating relies on an alternating current to generate an alternating magnetic field in an induction heating coil. When the magnetic field passes through a conductive material (such as metal), eddy currents are generated in the material, which are converted into heat energy due to the resistance of the material, thereby heating the material. The higher the magnetic field density, the more eddy currents are generated per unit time, and the more obvious the heating effect.

[0069] Temperature difference distribution:

[0070] Furnace top: Because it is close to the air environment and dissipates heat quickly, the temperature at this location relies on high magnetic field density to make the area heat up quickly, thereby compensating for the defect of fast heat dissipation and making the temperature distribution more uniform.

[0071] Upper part of the furnace: This position dissipates heat relatively slower than the furnace top. The medium magnetic field density makes the heating speed moderate, compensates for the heat dissipation, and the temperature distribution is more uniform.

[0072] In the furnace: The heat in this position is more concentrated, the heat loss is low, and through the combination of parallel and series connection, a medium magnetic field density is achieved, and the heating speed and temperature distribution are more uniform.

[0073] Lower half of the furnace: This position dissipates heat relatively slower than the furnace top. The medium magnetic field density makes the heating speed moderate, compensates for the heat dissipation, and the temperature distribution is more uniform.

[0074] Furnace bottom: Because it is close to the bottom ground environment, the heat dissipation is faster, so the temperature at this location relies on the high magnetic field density to make the area heat up quickly, thereby compensating for the defect of fast heat dissipation and the temperature distribution is more uniform.

[0075] With this design, the temperature distribution inside the furnace presents a high-low-high temperature gradient from the top to the bottom of the furnace. This distribution helps to reduce the temperature differences inside the furnace and ensure that the entire furnace can achieve a relatively uniform temperature distribution during the heating process, thereby improving heating efficiency and processing quality. At the same time, by reducing the frequency of manual adjustment of coil series and parallel, the labor intensity is reduced and the convenience and safety of operation are improved.

[0076] Example 2

[0077] Similarly, the series and parallel configuration of the induction heating coil 220 illustrated above for a single heating system 200, for three heating systems 200, with the furnace body as a reference, the furnace top, upper half, middle, lower half and bottom of the furnace body, mainly multiple series connections can be set up at different positions of the upper and lower parts of the furnace body to concentrate the temperature, while the furnace can be connected in series and parallel in a more dispersed, dispersed and more dispersed manner, so as to minimize the temperature difference when the initial state of the furnace body is met.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An induction heating device with multi-point temperature measurement feedback, comprising a furnace body (100), characterized in that: The furnace body (100) is provided with at least one or three heating systems (200), the heating system (200) comprising a plurality of temperature detectors (210) installed at different positions of the furnace body (100), a plurality of induction heating coils (220) surrounding the furnace body (100), an insulating plate (230) fixed outside the furnace body (100), and a medium frequency AC power supply unit (240); A plurality of the induction heating coils (220) are arranged from top to bottom, and a notch (221) is provided on the induction heating coil (220) to form an open induction heating coil, wherein the notch (221) corresponds to the insulating plate (230); an end of the notch (221) of the induction heating coil (220) and an end of the notch (221) of an adjacent induction heating coil (220) are connected on the insulating plate (230) by arranging bolts (222), nuts (223) and metal plates (224), thereby forming a series or parallel circuit configuration; The input end of the first induction heating coil (220) is electrically connected to the output end of the medium frequency AC power supply unit, and the output end of the last induction heating coil (220) is electrically connected to the input end of the medium frequency AC power supply unit.

2. The induction heating device with multi-point temperature measurement feedback as claimed in claim 1, characterized in that: Water pipes (225) are also provided at both ends of the induction heating coil (220), one of which is a water inlet pipe and the other is a water outlet pipe.

3. The induction heating device with multi-point temperature measurement feedback as claimed in claim 1, characterized in that: A cage frame (300) is provided outside the furnace body (100), the cage frame (300) has an opening at the top, and the top of the furnace body (100) extends to the opening.

4. The induction heating device with multi-point temperature measurement feedback as claimed in claim 3, characterized in that: The cage (300) is also provided with a plurality of magnetic yokes (310) distributed outside the furnace body (100).

5. The induction heating device with multi-point temperature measurement feedback as claimed in claim 3, characterized in that: A demagnetizing ring (320) is provided at the top opening of the cage frame (300).

6. A temperature balancing method for induction heating equipment with multi-point temperature measurement feedback, characterized in that: The induction heating device using the multi-point temperature measurement feedback as described in any one of claims 1 to 5 comprises the following steps: S1. A plurality of temperature detectors (210) are installed inside the furnace body (100), each temperature detector (210) being arranged at a predetermined monitoring point to monitor the temperature inside the furnace in real time; S2. The temperature data collected by the temperature detector (210) is transmitted to the user interface in real time for the staff to monitor the temperature distribution inside the furnace (100); S3. The staff identifies the areas in the furnace where the temperature is too high or too low based on the temperature data displayed on the user interface; S4. For a single heating system (200), the staff adjusts the series-parallel configuration between the induction heating coils (220) of each system according to the temperature data: If the temperature in a certain area is too low, the coils of the corresponding heating system are connected in series to concentrate the magnetic field and heat to that area; If the temperature in a certain area is too high, the coils of the corresponding heating system are connected in parallel to disperse the magnetic field and heat and reduce the temperature in that area; For the three heating systems (200), the series and parallel configurations of each system can be selectively adjusted according to the temperature distribution to achieve a more complex temperature balancing strategy; Series configuration: two or more induction heating coils (220) are connected end to end so that current passes through each coil in turn to concentrate the magnetic field and increase the temperature of a specific area; Parallel configuration: connecting the corresponding ends of two or more induction heating coils (220) to each other so that the current is divided among the multiple coils to disperse the magnetic field and reduce the temperature of a specific area; S5. Dynamically adjust the series or parallel state of the induction heating coil (220) to respond to temperature changes and maintain a balanced temperature inside the furnace (100); S6. The staff continuously monitors the temperature and adaptively executes steps S3 to S5 according to the feedback from the user interface to ensure that the temperature difference inside the furnace body (100) is maintained at about 100°C.

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