Induction heating coil and induction heating device

Abstract

The application discloses an induction heating coil and an induction heating device. The induction heating coil comprises: a main heating coil and an auxiliary coil arranged side by side, a first end of the main heating coil and a first end of the auxiliary coil are respectively connected to a power supply, and a second end of the main heating coil and a second end of the auxiliary coil are respectively free ends. Wherein, the main heating coil and the auxiliary coil are connected to the loop conduction of the power supply by single-point connection between the main heating coil and the auxiliary coil in the radial direction, and the size of the actual heating area length of the main heating coil defined by the distance from the first end of the main heating coil to the connection position on the main heating coil is adjusted by changing the different connection positions between the main heating coil and the auxiliary coil in the axial direction. The application can effectively solve the single production capacity of the inductor, and can greatly improve the production efficiency and heating quality.

Description

Technical Field

[0001] This invention relates to the field of induction heating technology, and in particular to an induction heating coil and an induction heating device. Background Technology

[0002] In the context of vigorously promoting blue skies, white clouds, energy conservation, and emission reduction, induction heating equipment that facilitates artificial intelligence production is a development trend that is replacing traditional gas furnaces and mesh belt furnaces, and its use in modern large-scale industrial production is becoming increasingly common.

[0003] Typically, due to the specific process requirements of customers, the production capacity of workpieces of different specifications varies significantly, and the heating temperature requirements are also numerous. If different induction coils (sensors) are configured for different process requirements, it will result in end customers configuring a large number of coils, greatly increasing their maintenance burden and workload.

[0004] In addition, for warm forging workpieces, since the required heating temperature is relatively low, usually not exceeding 300°C, if the actual heating area is too long, the heating temperature of the workpiece may exceed the process requirements, thus failing to meet the heating requirements. In this case, the customer will have to purchase a new inductor to meet the different requirements of the heating area length for warm forging workpieces. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing induction heating equipment where the heating inductor capacity is too limited, and to provide an induction heating coil and induction heating device. The actual heating zone length of the workpiece can be adjusted by adjusting (moving) the short-circuit position between the main heating coil and the auxiliary coil, thereby enabling the heated workpiece to meet the customer's usage requirements in terms of process.

[0006] One technical solution of the present invention to achieve the above objective is:

[0007] An induction heating coil, comprising:

[0008] A main heating coil and an auxiliary coil are arranged side by side. The first end of the main heating coil and the first end of the auxiliary coil are respectively connected to a power source, and the second end of the main heating coil and the second end of the auxiliary coil are both free ends. The main heating coil and the auxiliary coil are connected to the power source by a single point radial connection, and the actual heating area length of the main heating coil, defined by the distance from the first end of the main heating coil to the connection point, is adjusted by changing the different axial connection positions between the main heating coil and the auxiliary coil.

[0009] Furthermore, the outer ring of the main heating coil is provided with a plurality of first taps spaced along the axial direction, and the outer ring of the auxiliary coil is provided with a plurality of second taps spaced along the axial direction, corresponding to the positions of the first taps. By connecting any pair of first taps and second taps through a shorting block, the circuit containing the main heating coil and the auxiliary coil is made conductive. By adjusting the connection position of the shorting block in the axial direction, the actual heating area length of the main heating coil, determined by the distance from the first end of the main heating coil to the shorting block, is adjusted.

[0010] Furthermore, the first tap is provided on the main heating coil at intervals of 1 to 2 turns, and the second tap is provided on the auxiliary coil at intervals of 1 to 2 turns, corresponding to the position of the first tap.

[0011] Furthermore, the first tap and the second tap are respectively disposed on the inner sides of the main heating coil and the auxiliary coil.

[0012] Furthermore, the shorting block is equipped with a water-cooling pipe.

[0013] Furthermore, the free end of the main heating coil is aligned and oriented in the same direction as the first end of the auxiliary coil.

[0014] Furthermore, the length of the main heating coil is determined based on the maximum production capacity.

[0015] Furthermore, the length of the auxiliary coil is determined based on the minimum production capacity.

[0016] Furthermore, the main heating coil and the auxiliary coil both consist of hollow tube wound coils and are connected to cooling water.

[0017] An induction heating device comprising the aforementioned induction heating coil.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) This invention can greatly improve production efficiency, improve the overall heating quality of blank workpieces, facilitate the artificial intelligence of production equipment, reduce the floor space occupied by traditional similar workpiece heating equipment, and has huge economic and social benefits.

[0020] (2) It has the characteristics of being simple and reasonable, and highly practical in engineering practice. It can significantly reduce the customer's investment and avoid the problem of customers having a wide variety of sensor types due to large fluctuations in workpiece production capacity and large changes in workpiece heating temperature requirements. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of an induction heating coil according to a preferred embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the installation structure of an induction heating coil according to a preferred embodiment of the present invention. Detailed Implementation

[0023] To better understand the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0024] refer to Figure 1 The present invention provides an induction heating coil, comprising a main heating coil 10 and an auxiliary coil 11 that cooperate with each other.

[0025] The main heating coil 10 and the auxiliary coil 11 adopt a multi-turn spiral coil structure wound along the axial direction; and the main heating coil 10 and the auxiliary coil 11 are arranged side by side with their central axes parallel to each other. Among them, the main heating coil 10 is used for induction heating of the workpiece.

[0026] The first end 101 (shown as the left end in the diagram) of the main heating coil 10 is connected to one of the terminals of, for example, an intermediate frequency power supply (e.g., the live wire or neutral wire). The second end 102 (shown as the right end in the diagram) of the main heating coil 10 is a free end (i.e., the first turn of the left end of the main heating coil 10 is connected to one of the terminals of the intermediate frequency power supply, and the first turn of the right end of the main heating coil 10 is a free end). The first end 112 (shown as the right end in the diagram) of the auxiliary coil 11 is connected to another terminal of the intermediate frequency power supply (e.g., the neutral wire or the live wire). The second end 111 (shown as the left end in the diagram) of the auxiliary coil 11 is a free end (i.e., the first turn of the right end of the auxiliary coil 11 is connected to another terminal of the intermediate frequency power supply, and the first turn of the left end of the auxiliary coil 11 is a free end).

[0027] Thus, when a single-point radial electrical connection is made between the main heating coil 10 and the auxiliary coil 11, even if a radial short circuit occurs between the main heating coil 10 and the auxiliary coil 11 at a certain axial position (a certain turn), the circuit connecting the main heating coil 10 and the auxiliary coil 11 to the power supply is completed. That is, the circuit formed along one of the power supply terminals, the portion of the main heating coil 10 between its first end 101 and its short-circuited position, the portion of the auxiliary coil 11 between its short-circuited position and its first end 112, and the other power supply terminal is completed. However, no current flows through the portion of the main heating coil 10 between its second end 102 and its short-circuited position, and the portion of the auxiliary coil 11 between its short-circuited position and its second end 111, due to the presence of their respective free ends.

[0028] Furthermore, when the different radial connection positions between the main heating coil 10 and the auxiliary coil 11 in the axial direction are changed, the length of the main heating coil 10 portion between the first end 101 of the main heating coil 10 and its short-circuit position will be changed.

[0029] Since the actual heating area length of the main heating coil 10 is determined by the effective length of the main heating coil 10 in the heating circuit, that is, the actual heating area length of the main heating coil 10 is defined by the distance from the first end 101 of the main heating coil 10 to the connection position, when the radial connection position between the main heating coil 10 and the auxiliary coil 11 changes in the axial direction, the actual heating area length of the main heating coil 10 will also change accordingly. Therefore, when the workpiece production capacity or the workpiece heating temperature changes, there is no need to replace the corresponding heating coil (inductor). The heating area length of the workpiece can be adjusted simply by adjusting the connection position between the main heating coil 10 and the auxiliary coil 11, so that the heated workpiece temperature and process can meet the customer's requirements.

[0030] refer to Figure 1 In a preferred embodiment, the first end 101 of the main heating coil 10 is arranged in the same direction as the free end of the auxiliary coil 11, and the free end of the main heating coil 10 is arranged in the same direction and aligned with the first end 112 of the auxiliary coil 11.

[0031] In a preferred embodiment, the main heating coil 10 and the auxiliary coil 11 can be connected by axially spaced pairs of taps on the outer ring (wire diameter) of the main heating coil 10 and the outer ring of the auxiliary coil 11. Specifically, multiple first taps 14 can be axially spaced on the outer ring of the main heating coil 10, and multiple second taps 13 corresponding to the positions of the first taps 14 can be axially spaced on the outer ring of the auxiliary coil 11, thus forming multiple tap pairs. In this way, any opposite first tap 14 and a second tap 13 can be connected through a shorting block 12, thereby achieving conductivity of the circuit containing the main heating coil 10 and the auxiliary coil 11.

[0032] The tap can be a plate (sheet) structure and welded to the main heating coil 10 and the auxiliary coil 11 for easy connection with the shorting block 12.

[0033] The jumper block 12 can be a columnar structure. The two ends of the jumper block 12 can be connected to the first tap 14 and the second tap 13 using fasteners such as bolts.

[0034] By adjusting the axial connection position of the shorting block 12, the actual heating area length of the main heating coil 10, determined by the distance from the first end 101 of the main heating coil 10 to the shorting block 12, can be adjusted. For example, the diagram shows the shorting block 12 connected at the fourth pair of taps from right to left; in this case, the actual heating area length of the main heating coil 10 is the distance from the first end 101 of the main heating coil 10 to the fourth pair of taps. To reduce the actual heating area length of the main heating coil 10, the shorting block 12 can be connected to each pair of taps to its left; in this case, the length occupied by the auxiliary coil 11 in the circuit increases accordingly. Conversely, to increase the actual heating area length of the main heating coil 10, the shorting block 12 can be connected to each pair of taps to its right; in this case, the length occupied by the auxiliary coil 11 in the circuit decreases accordingly.

[0035] In a preferred embodiment, a first tap 14 may be provided on the main heating coil 10 at intervals of 1 to 2 turns; similarly, a second tap 13 corresponding to the position of the first tap 14 may be provided on the auxiliary coil 11 at intervals of 1 to 2 turns.

[0036] Furthermore, the first tap 14 and the second tap 13 are respectively located on the inner side of the main heating coil 10 and the auxiliary coil 11.

[0037] In a preferred embodiment, a water-cooling pipe may be provided on the shorting block 12.

[0038] In a preferred embodiment, the main heating coil 10 and the auxiliary coil 11 can be wound from hollow copper tubes of a certain diameter and number of turns according to design requirements to form an inductor. The main heating coil 10 and the auxiliary coil 11 can be cooled by passing cooling water through the hollow copper tubes.

[0039] After the winding is completed, the outer surface of the copper tube of the sensor needs to be insulated, and the winding turn gap needs to be adjusted.

[0040] The present invention also provides an induction heating device, which may include the induction heating coil described above.

[0041] refer to Figure 2 An induction heating device of the present invention may include a coil housing 18. An induction heating coil is installed inside the coil housing 18. The coil housing 18 may have a frame structure, and the main heating coil 10 of the induction heating coil can be fixed inside the coil housing 18 by a mounting bracket 15. An auxiliary coil 11 may be positioned above the main heating coil 10, and may also be fixed inside the coil housing 18 by a mounting bracket.

[0042] In a preferred embodiment, a coil and power connection bus 16, such as a copper busbar, may be mounted on the mounting bracket. The first end 101 of the main heating coil 10 and the first end 112 of the auxiliary coil 11 can be connected to the power supply terminal via the coil and power connection bus 16.

[0043] A cooling water distributor 17 can be installed on the coil housing 18. It can be connected to the water cooling pipes of the main heating coil 10, auxiliary coil 11 and shorting block 12 via connecting water pipes to provide circulating cooling water to the main heating coil 10, auxiliary coil 11 and shorting block 12.

[0044] The side plate of the coil housing 18 (facing the drawing direction) needs to be easily disassembled so that when the workpiece production capacity or the workpiece heating temperature varies greatly, the connection between the main heating coil 10 and the auxiliary coil 11 can be easily adjusted by disassembling and assembling the shorting block 12 to adjust the length of the workpiece heating area so that the heated workpiece temperature and process can meet the customer's requirements.

[0045] The first tap 14 and the second tap 13 should be located on the same side of the coil housing 18 to facilitate the installation and removal of the shorting block 12.

[0046] When designing induction heating coils, the external dimensions of the main heating coil 10 and the auxiliary coil 11 can be determined according to the external dimensions and contour of the workpiece. After determining the external dimensions of the main heating coil 10, the maximum length of the main heating coil 10 can be determined according to the maximum production capacity of the workpiece. After determining the external dimensions of the auxiliary coil 11, the length of the auxiliary coil 11 can be determined according to the minimum production capacity of the workpiece.

[0047] Guided by the feeding and discharging system, the workpiece enters the main heating coil 10 from one end of the coil housing 18 and through one end of the main heating coil 10. The shorting block 12 is pre-installed and connected to the first tap 14 and the second tap 13 at corresponding positions according to the set actual heating area length requirement of the main heating coil 10. When the power is turned on, the workpiece can be inductively heated by the main heating coil 10. When there are significant changes in workpiece production capacity or temperature process, the actual heating area length of the induction coil can be quickly adjusted simply by changing the connection position of the shorting block 12.

[0048] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. An induction heating coil, characterized in that, include: A main heating coil and an auxiliary coil are arranged side by side. The first ends of the main heating coil and the auxiliary coil are respectively connected to a power source, and the second ends of the main heating coil and the auxiliary coil are both free ends. The circuit connecting the main heating coil and the auxiliary coil to the power source is made conductive by making a single-point radial connection between them. The actual heating area length of the main heating coil, defined by the distance from the first end of the main heating coil to the connection point, is adjusted by changing the axial connection positions between the main heating coil and the auxiliary coil. The outer ring of the main heating coil is provided with a plurality of first taps spaced axially, and the outer ring of the auxiliary coil is provided with a plurality of second taps spaced axially, corresponding to the positions of the first taps. By connecting any pair of first taps and second taps through a shorting block, the circuit of the main heating coil and the auxiliary coil is made conductive. By adjusting the connection position of the shorting block in the axial direction, the actual heating area length of the main heating coil, which is determined by the distance from the first end of the main heating coil to the shorting block, is adjusted. A circuit is formed between one of the terminals of the power supply, the main heating coil portion between the first end of the main heating coil and its short-circuited position, the auxiliary coil portion between the short-circuited position on the auxiliary coil and the first end of the auxiliary coil, and the other terminal of the power supply. To increase the actual heating area length of the main heating coil, connect the shorting block to each pair of taps on its right side; at this time, the length occupied by the auxiliary coil in the circuit will decrease accordingly.

2. The induction heating coil according to claim 1, characterized in that, The first tap is provided on the main heating coil at intervals of 1 to 2 turns, and the second tap is provided on the auxiliary coil at intervals of 1 to 2 turns, corresponding to the position of the first tap.

3. The induction heating coil according to claim 1, characterized in that, The first tap and the second tap are respectively located on the inner sides of the main heating coil and the auxiliary coil.

4. The induction heating coil according to claim 1, characterized in that, The shorting block is equipped with a water-cooling pipe.

5. The induction heating coil according to claim 1, characterized in that, The free end of the main heating coil is aligned and oriented in the same direction as the first end of the auxiliary coil.

6. The induction heating coil according to claim 5, characterized in that, The length of the main heating coil is determined based on the maximum production capacity.

7. The induction heating coil according to claim 5, characterized in that, The length of the auxiliary coil is determined based on the minimum production capacity.

8. The induction heating coil according to claim 1, characterized in that, The main heating coil and the auxiliary coil are both hollow tube wound coils and are connected to cooling water.

9. An induction heating device, characterized in that, It contains the induction heating coil as described in any one of claims 1-8.

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