阅读说明：本技术 一种升降电磁加热装置 (Lifting electromagnetic heating device ) 是由 曹玲玲 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种升降电磁加热装置,包括中部线圈及中部线圈支架,中部线圈缠绕安装在中部线圈支架上；还包括外围线圈及外围线圈支架,外围线圈缠绕安装在外围线圈支架上,中部线圈支架与外围线圈支架两者为可相对升降设置。中部线圈与外围线圈可根据使用需求相对升降,以变换中部线圈与外围线圈的组合体的形状来适应不同形状的受热器具,因而本发明的升降电磁加热装置对受热器具的兼容性好。(The invention discloses a lifting electromagnetic heating device, which comprises a middle coil and a middle coil support, wherein the middle coil is wound on the middle coil support; the coil winding device further comprises a peripheral coil and a peripheral coil support, wherein the peripheral coil is wound on the peripheral coil support, and the middle coil support and the peripheral coil support can be arranged in a relatively lifting mode. The middle coil and the peripheral coil can be relatively lifted according to the use requirement, so that the shape of the combination of the middle coil and the peripheral coil is changed to adapt to heating appliances of different shapes, and the lifting electromagnetic heating device has good compatibility with the heating appliances.)

1. A lifting electromagnetic heating device comprises a middle coil (1) and a middle coil support (2), wherein the middle coil (1) is wound on the middle coil support (2); the method is characterized in that: the coil support is characterized by further comprising a peripheral coil (3) and a peripheral coil support (4), wherein the peripheral coil (3) is wound on the peripheral coil support (4), and the middle coil support (2) and the peripheral coil support (4) can be arranged in a relatively lifting mode.

2. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the peripheral coil support (4) is fixedly connected with the base (8); the coil support is characterized by further comprising an electric lifting mechanism (7), wherein the electric lifting mechanism (7) is in driving connection with the middle coil support (2).

3. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the peripheral coil support (4) is fixedly connected with the base (8); the coil support is characterized by further comprising a first spring (71) used for driving the middle coil support (2) to reset upwards, one end of the first spring (71) is connected with the peripheral coil support (4), and the other end, corresponding to the first spring (71), is connected with the middle coil support (2).

4. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the middle coil support (2) is fixedly connected with the base (8); the coil winding device is characterized by further comprising a second spring (72) used for driving the peripheral coil support (4) to reset upwards, one end of the second spring (72) is connected with the peripheral coil support (4), and the other end, corresponding to the second spring (72), is connected with the base (8).

5. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the middle coil (1) is a flat coil, and the peripheral coil (3) is an arc coil or a cylindrical coil.

6. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the middle coil (1) and the peripheral coil (3) are both arc coils.

7. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the sealing ring (12) comprises a first flange (1201), a second flange (1202) and an elastic extension portion (1203), the elastic extension portion (1203) is arranged between the first flange (1201) and the second flange (1202), the first flange (1201) is in sealing connection with the middle coil support (2), and the second flange (1202) is in sealing connection with the peripheral coil support (4).

8. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: also comprises a stopper (11) used for surrounding and contacting the outer wall of the cooker.

9. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: still include base (8), the interior bottom of base (8) is formed with and is used for catching the follow water receiving tank (81) of the gap water body that flows down between middle part coil support (2) and peripheral coil support (4), the bottom of water receiving tank (81) is formed with water leakage hole (8101).

10. The elevating electromagnetic heating apparatus as set forth in claim 1, wherein: the middle coil (1) and the peripheral coil (3) are wound by the same lead or the middle coil (1) and the peripheral coil (3) are wound by corresponding leads respectively.

Technical Field

The invention relates to the technical field of electromagnetic heating devices, in particular to a lifting electromagnetic heating device.

Background

When the electromagnetic heating coil works, a certain smaller distance range is required to be kept between the coil and the outer surface of a heated appliance; if the shape of the heated appliance is greatly changed, the shape of the coil needs to be changed along with the shape of the appliance; because the same coil can not change the shape to adapt to the heated appliance, the existing electromagnetic heating device adopting the arc-shaped coil or the electromagnetic heating device adopting the plane-shaped coil has limitations.

1. When the electromagnetic heating technology is used, two different heating appliances with flat bottoms or cambered bottoms are frequently needed due to different heating/cooking requirements, and the two heating appliances with different shapes cannot be well compatible to use on the same electromagnetic cooker.

2. Under the condition that an electromagnetic cooker is incompatible, if a user forcibly uses an arc bottom appliance on a cooker adopting a planar coil, firstly, the arc bottom appliance is easy to be unstably placed; secondly, the arc bottom device only has a very small heating area at the bottom and cannot meet the cooking heating requirement; and thirdly, if two cookers (one for each of a plane shape and an arc shape) are purchased at the same time, the limit of the placing space is easily caused, and the switching work and the subsequent cleaning work are increased.

3. When the arc bottom appliance is used on a cooker adopting a planar coil, the situation that food or appliances are burnt out due to overhigh local temperature of the appliance due to the fact that high temperature acts on a small area of the bottom of the arc bottom appliance for a long time is easy to occur.

4. If a flat-bottom heating appliance is used on a cooker adopting an arc-shaped surface coil, the cooker cannot be started to normally use due to the problem that the distance between the coil and the flat-bottom outer wall of the flat-bottom heating appliance is too large.

In summary, the electromagnetic heating device of the prior art has poor compatibility with the heated apparatus.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a lifting electromagnetic heating device which has good compatibility with a heated appliance.

The purpose of the invention is realized by the following technical scheme.

The lifting electromagnetic heating device comprises a middle coil and a middle coil support, wherein the middle coil is wound and installed on the middle coil support; the coil winding device comprises a central coil, a peripheral coil support, a central coil support and a peripheral coil support, wherein the peripheral coil is wound on the peripheral coil support, and the central coil support and the peripheral coil support can be arranged in a relatively lifting mode.

Preferably, the lifting electromagnetic heating device further comprises a base, and the peripheral coil support is fixedly connected with the base; the electric lifting mechanism is in driving connection with the middle coil support.

Preferably, the lifting electromagnetic heating device further comprises a base, and the peripheral coil support is fixedly connected with the base; the coil support is characterized by further comprising a first spring used for driving the middle coil support to reset upwards, one end of the first spring is connected with the peripheral coil support, and the other end, corresponding to the first spring, of the first spring is connected with the middle coil support.

Preferably, the lifting electromagnetic heating device further comprises a base, and the middle coil support is fixedly connected with the base; the coil support is characterized by further comprising a second spring used for driving the peripheral coil support to reset upwards, one end of the second spring is connected with the peripheral coil support, and the other end, corresponding to the second spring, of the second spring is connected with the base.

Preferably, the middle coil is a flat coil, and the peripheral coil is an arc coil or a cylindrical coil.

Preferably, the central coil and the peripheral coil are both provided as arc-shaped coils.

Preferably, the lifting electromagnetic heating device further comprises a sealing ring, wherein the sealing ring comprises a first flange, a second flange and an elastic extension portion, the elastic extension portion is arranged between the first flange and the second flange, the first flange is connected with the middle coil support in a sealing mode, and the second flange is connected with the peripheral coil support in a sealing mode.

Preferably, the lifting electromagnetic heating device further comprises a stopper for surrounding and contacting the outer wall of the pot.

Preferably, the lifting electromagnetic heating device further comprises a base, a water receiving groove for receiving water flowing down from a gap between the middle coil support and the peripheral coil support is formed at the inner bottom of the base, and a water leakage hole is formed at the bottom of the water receiving groove.

Preferably, the middle coil and the peripheral coil are wound by the same wire or the middle coil and the peripheral coil are wound by corresponding wires respectively.

Compared with the prior art, the invention has the following beneficial effects: the middle coil and the peripheral coil are arranged, the middle coil is wound and installed on the middle coil support, the peripheral coil is wound and installed on the peripheral coil support, and the middle coil support and the peripheral coil support can be arranged in a relatively lifting mode, so that the combination of the middle coil and the peripheral coil can be changed in shape to adapt to heating appliances of different shapes, and the lifting electromagnetic heating device is good in compatibility with the heating appliances.

Drawings

Fig. 1 is a schematic perspective sectional view of an electromagnetic heating device and a pan assembly according to the present invention.

Fig. 2 is an exploded view of the electromagnetic heating device of the present invention in combination with a pan.

Fig. 3 is a schematic sectional view of the combination of the electromagnetic heating device and the pan according to the first embodiment of the present invention.

Fig. 4 is a schematic sectional view of an electromagnetic heating device and a curved-bottom pan combination according to a first embodiment of the present invention.

Fig. 5 is a schematic sectional view of a combination of an electromagnetic heating device and a pan according to a second embodiment of the present invention.

Fig. 6 is a schematic sectional view of an electromagnetic heating device and a curved-bottom pan combination according to a second embodiment of the present invention.

Fig. 7 is a schematic sectional view of a combination of an electromagnetic heating device and a pan according to a third embodiment of the present invention.

Fig. 8 is a schematic sectional view of an electromagnetic heating device and a curved-bottom pan combination according to a third embodiment of the present invention.

Fig. 9 is a schematic sectional view of an electromagnetic heating device and a curved-bottom pan combination according to a fourth embodiment of the present invention.

Fig. 10 is a schematic sectional view of an electromagnetic heating device and a cup pot combination according to a fifth embodiment of the present invention.

Fig. 11 is a sectional view schematically showing the combination of an electromagnetic heating device and a pan according to a sixth embodiment of the present invention.

Fig. 12 is a schematic perspective sectional view of the seal ring of the present invention.

Fig. 13 is a schematic diagram of a first connection mode of the middle coil and the peripheral coil according to the present invention.

Fig. 14 is a schematic diagram of a second connection mode of the middle coil and the peripheral coil according to the invention.

Fig. 15 is a schematic cross-sectional view of the stopper of the present invention.

Description of reference numerals: 1-middle coil; 101-coil connecting line segment; 2-middle coil support; 201-a slide column; 3-a peripheral coil; 4-a peripheral coil support; 401-a guide arm; 5-middle coil magnetic strip; 6-peripheral coil magnetic strip; 7-an electric lifting mechanism; 71-a first spring; 72-a second spring; 701-a bracket; 8-a base; 801-a first support column; 802-guide posts; 803-second support column; 81-water receiving tank; 8101-water leakage hole; 9-a temperature control device; 10-a panel; 11-a stopper; 1101-rounded corners; 12-a sealing ring; 1201-a first flange; 1202-a second flange; 1203-elastic extension; 13-a first clamping ring; 14-a second clamping ring; 97-cup type pan; 98-arc bottom pan; 99-pan.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the lifting electromagnetic heating device of the present invention comprises a middle coil 1 and a middle coil support 2, wherein the middle coil 1 is wound on the middle coil support 2, the lifting electromagnetic heating device of the present invention further comprises a peripheral coil 3 and a peripheral coil support 4, and the peripheral coil 3 is wound on the peripheral coil support 4; the middle coil support 2 can be provided with a middle coil magnetic strip 5, and the peripheral coil support 4 can be provided with a peripheral coil magnetic strip 6; the middle coil 1 is used for correspondingly heating the middle part of a pot (namely, a heated appliance), and the peripheral coil 3 is used for heating the peripheral part of the pot relative to the middle part of the pot; the middle coil support 2 and the peripheral coil support 4 are arranged in a relatively sliding manner, specifically, the middle coil support 2 and the peripheral coil support 4 are in sliding connection in a mutual contact manner, or the electromagnetic heating device is provided with a support structure, the middle coil support 2 and the peripheral coil support 4 are respectively in sliding connection in a contact manner with the support structure, in other words, the middle coil support 2 and the peripheral coil support 4 can be in indirect sliding connection; the middle coil support 2 and the peripheral coil support 4 are arranged in a relatively lifting manner, that is, the relative sliding of the middle coil support 2 and the peripheral coil support 4 is relative sliding along the up-down direction; specifically, in order to achieve the relative lifting of the middle coil support 2 and the peripheral coil support 4, the middle coil support 2 may be configured to be movable up and down while the peripheral coil support 4 is configured to be stationary, or the middle coil support 2 may be configured to be stationary while the peripheral coil support 4 is configured to be movable up and down, but of course, when both the middle coil support 2 and the peripheral coil support 4 are configured to be movable up and down, the middle coil support 2 and the peripheral coil support 4 may be relatively lifted or lowered as long as the middle coil support 2 and the peripheral coil support 4 are not rigidly connected. As shown in fig. 1 and 2, the upper side of the middle coil support 2 may be provided with a panel 10, and the panel 10 can be in contact with the bottom of the pot. With the above arrangement, as shown in fig. 3, when the electromagnetic heating device of the present invention uses the pan 99, the central coil 1 is correspondingly close to the pan 99, the peripheral coil 3 is located below the pan 99, the central coil 1 is operated to heat the central portion of the pan 99, and the peripheral coil 3 is not operated; as shown in fig. 4, when the arc-bottom pot 98 is used in the electromagnetic heating device of the present invention (the arc-bottom pot 98 belongs to a concave pot), the middle coil support 2 moves downward relative to the peripheral coil support 4, so that the peripheral coil 3 can approach the arc-bottom pot 98, and the peripheral coil 3 and the middle coil 1 can work simultaneously or alternately; compared with the prior art, the electromagnetic heating device of the invention avoids that only the bottom center of the arc-bottom pan 98 is effectively heated when the arc-bottom pan 98 is used, or only the peripheral part of the pan 99 is effectively heated when the pan 99 is used (in other words, the middle part of the pan 99 is not effectively heated), so the electromagnetic heating device of the invention can adapt to the use of the pan 99 and the arc-bottom pan 98, and has good compatibility to heated appliances.

In some embodiments, as shown in fig. 3 and 4, the electromagnetic heating apparatus of the present invention further includes a base 8, the peripheral coil support 4 is fixedly connected to the base 8, specifically, the base 8 is formed with first support columns 801, and outer edge portions of the peripheral coil support 4 are fixedly connected to upper ends of the corresponding first support columns 801 through corresponding screws, as shown in fig. 1, the peripheral coil support 4 may be formed with guide arms 401, the middle coil support 2 may be formed with sliding columns 201, the sliding columns 201 are circumferentially and uniformly distributed, and the sliding columns 201 are adapted to movably pass through the corresponding guide arms 401, so as to realize relative sliding connection between the middle coil support 2 and the peripheral coil support 4; the electromagnetic heating device of the present invention further includes an electric lifting mechanism 7, the electric lifting mechanism 7 is connected to the middle coil support 2 in a driving manner, and the electric lifting mechanism 7 capable of driving the middle coil support 2 to move up and down is a conventional one, for example, as shown in fig. 1, the electric lifting mechanism 7 includes a screw rod, a nut, and a motor, the screw rod is fixedly connected to the middle coil support 2 through a bracket 701, the screw rod is screwed to the nut, the nut is rotatably connected to the base 8, and the motor can drive the nut to rotate through a gear pair, so that the motor can drive the middle coil support 2 to move up and down. For another example, the electric lifting mechanism 7 may include a connecting rod and a cam, the cam is driven by a corresponding motor to rotate, the connecting rod is in contact with the cam, the connecting rod is relatively fixedly connected with the middle coil support 2, and the cam can drive the middle coil support 2 to move up and down. The arrangement of the electric lifting mechanism 7 is favorable for realizing the relative lifting of the middle coil support 2 and the peripheral coil support 4 in an electric mode, so that the electromagnetic heating device is simple and convenient to operate, and in addition, a control system for controlling the electric lifting mechanism 7 in the prior art can be arranged, so that the middle coil support 2 can be lifted automatically. Similarly, the middle coil support 2 can be fixed, and the electric lifting mechanism 7 is connected with the peripheral coil support 4 in a driving manner, so that the middle coil support 2 and the peripheral coil support 4 can be lifted electrically and relatively.

In some embodiments, as shown in fig. 5 and 6, the peripheral coil support 4 is fixedly connected to the base 8; the electromagnetic heating device further comprises a first spring 71 for driving the middle coil support 2 to reset upwards, one end of the first spring 71 is connected with the peripheral coil support 4, the other end, corresponding to the first spring 71, is connected with the middle coil support 2, specifically, the first spring 71 can be sleeved outside the corresponding sliding column 201, and the lower end of the first spring 71 is in contact connection with the corresponding guide arm 401; when the pan 99 is placed on the electromagnetic heating device of this embodiment for use, as shown in fig. 5, the pan 99 may be supported by the upper end of the peripheral coil support 4 or the pan 99 may be supported by the stopper 11, the middle coil 1 is close to the bottom of the pan 99, and after the pan 99 is placed on the electromagnetic heating device of this embodiment, the first spring 71 may be further compressed by the weight of the pan 99 or the middle coil 1 may be kept still; as shown in fig. 6, when the arc-bottom pot 98 is used on the electromagnetic heating apparatus of this embodiment, the first spring 71 is compressed by the gravity of the arc-bottom pot 98, and then the middle coil 1 is lowered with respect to the peripheral coil 3 until the upper end of the peripheral coil support 4 or the stopper 11 is in contact with the arc-bottom pot 98, and in the state shown in fig. 6, both the middle coil 1 and the peripheral coil 3 can effectively heat the arc-bottom pot 98. Since the middle coil 1 is lowered by the gravity of the pot, when the pot is removed from the electromagnetic heating apparatus of the present invention, the middle coil 1 is lifted and restored by the elastic restoring force of the first spring 71, and the relative lifting of the middle coil support 2 and the peripheral coil support 4 is realized with a simple structure and low cost by providing the first spring 71.

In some embodiments, as shown in fig. 7 and 8, the middle coil support 2 is fixedly connected to the base 8, specifically, the base 8 is formed with a second support column 803, and the middle coil support 2 is fixedly connected to an upper end of the second support column 803, the electromagnetic heating apparatus of the present invention further includes a second spring 72 for driving the peripheral coil support 4 to return upward, one end of the second spring 72 is connected to the peripheral coil support 4, and the other end of the second spring 72 corresponding to the base 8 is connected to the base 8, specifically, the base 8 is formed with a guide post 802, the second spring 72 is sleeved outside the corresponding guide post 802, and an upper end of the second spring 72 is in contact with the peripheral coil support 4. As shown in fig. 7, when the pan 99 is put on the electromagnetic heating apparatus of the present embodiment for use, the peripheral coil support 4 is lowered by the gravity of the pan 99 and the second spring 72 is elastically compressed until the central coil 1 is close to the pan 99 (the pan 99 is supported by the central coil support 2 or the pan 99 is supported by the panel 10), and in the state of fig. 7, the peripheral coil 3 is not operated and the central coil 1 heats the pan 99; as shown in fig. 8, when the arc-bottom pan 98 is used by being placed on the electromagnetic heating apparatus of the present embodiment, the middle coil 1 and the peripheral coil 3 can effectively heat the arc-bottom pan 98 at the same time. By providing the second spring 72, the relative lifting of the middle coil support 2 and the peripheral coil support 4 is realized with a simple structure and low cost.

In some embodiments, as shown in fig. 4, the middle coil 1 is set as a flat coil (i.e. a flat coil), and the peripheral coil 3 is set as an arc coil, that is, the three-dimensional shape of the peripheral coil 3 can be adapted to the arc outer wall of the arc-bottom pan 98, and as can be seen from fig. 3, when the pan 99 is used, the bottom of the pan 99 can be well matched with the middle coil 1 because the middle coil 1 is set as a flat coil, so that the pan 99 is effectively heated; as can be seen from fig. 4, when the arc-bottom pan 98 is used, since the three-dimensional shape of the peripheral coil 3 is fitted to the outer wall shape of the arc-bottom pan 98, even if there is a lack of matching of the middle portion of the arc-bottom pan 98 with the middle coil 1, the arc-bottom pan 98 can be effectively heated by the peripheral coil 3.

In some embodiments, as shown in fig. 9, the central coil 1 and the peripheral coil 3 are both provided as arc coils, so that the electromagnetic heating device of the present embodiment is better matched with the arc-bottom pan 98, and the central coil 1 can effectively heat the pan 99 even if the bending amplitude of the central coil 1 is set to be small.

In some embodiments, as shown in fig. 10, the central coil 1 is a flat coil, the peripheral coil 3 is a cylindrical coil, and the cup pot 97 has a cylindrical outer wall and a flat bottom, so that the cylindrical outer coil 3 can fit the cylindrical outer wall of the cup pot 97, and the central coil 1 can fit the flat bottom of the cup pot 97 well.

In some embodiments, as shown in fig. 11, the electromagnetic heating apparatus of the present invention further includes a sealing ring 12, as shown in fig. 12, the sealing ring 12 includes a first flange 1201, a second flange 1202, and an elastic extension 1203, where the elastic extension 1203 is disposed between the first flange 1201 and the second flange 1202, as shown in fig. 11, the first flange 1201 is sealingly connected to the central coil support 2, and the second flange 1202 is sealingly connected to the peripheral coil support 4, specifically, a first pressing ring 13 is disposed on a lower side of the first flange 1201, the first flange 1201 is disposed between the central coil support 2 and the first pressing ring 13, the first pressing ring 13 is relatively fixedly connected to the central coil support 2 through corresponding screws, the second flange 1202 is disposed between the second pressing ring 14 and the peripheral coil support 4, and the peripheral coil support 4 is relatively fixedly connected to the second pressing ring 14 through corresponding screws. When the peripheral coil support 4 and the central coil support 2 are relatively moved in the up-down direction, the elastic extension portion 1203 shown in fig. 12 is elastically deformed to open or close, that is, the gap between the peripheral coil support 4 and the central coil support 2 is closed by the seal ring 12, so that water is prevented from leaking into the space below the central coil support 2.

In some embodiments, as shown in fig. 1 to 9, the electromagnetic heating apparatus of the present invention further includes a stopper 11 for surrounding and contacting the outer wall of the pot, the arc-bottom pot 98 and the pan 99 belong to the pot, and the "surrounding contact" means that the mutual contact points of the stopper 11 and the outer wall of the pot are circumferentially distributed (as shown in fig. 5, the stopper 11 is preferably in angular contact with the lower end of the pan 99), for example, the stopper 11 can be configured to have four contact points with the outer wall of the pot, so that when the pot is placed on the electromagnetic heating apparatus of the present embodiment for use, the pot is positioned by the stopper 11 in the horizontal plane, thereby preventing the pot from shifting during cooking, and being beneficial to safety; the stopper 11 may also provide an upward supporting force to the pot, for example, in the embodiment shown in fig. 6, when the arc-bottom pot 98 is placed on the panel 10, the first spring 71 is compressed by the gravity of the arc-bottom pot 98, the arc-bottom pot 98 descends, when the outer wall of the arc-bottom pot 98 contacts the stopper 11, the stopper 11 limits the arc-bottom pot 98, and at this time, the elastic restoring force of the first spring 71 may keep the panel 10 in contact with the middle of the arc-bottom pot 98.

Further, as shown in fig. 2, the stopper 11 may be configured to be ring-shaped, that is, in this embodiment, the stopper 11 may be in contact with the outer wall of the pot all around, so as to achieve the effect of "surrounding and contacting" the pot more fully, and thus the stopper 11 may have more stable stopping effect on the pot. As shown in fig. 15, the inner upper end of the stopper 11 is formed with a fillet 1101, when a user puts a pot on the stopper 11, the pot may not be aligned, and when the user moves the pot with hands to align the pot, the fillet 1101 can reduce the frictional resistance of the pot, so as to align the pot conveniently.

In some embodiments, as shown in fig. 5, a water receiving groove 81 for receiving water flowing down from a gap between the middle coil support 2 and the peripheral coil support 4 is formed at the inner bottom of the base 8, and water leakage holes 8101 are formed at the bottom of the water receiving groove 81, so that when water flows between the middle coil support 2 and the peripheral coil support 4 due to carelessness in a cooking process, the water may flow down into the water receiving groove 81, and then the water is discharged downward to the outside of the base 8 through the water leakage holes 8101, thereby preventing the water from affecting circuit devices disposed in the base 8. Specifically, the water receiving tank 81 is configured as an annular water tank, and the water receiving tank 81 is disposed below the gap between the middle coil support 2 and the peripheral coil support 4.

The middle coil 1 and the peripheral coil 3 can be wound by the same wire, fig. 13 schematically shows the position of the coil connecting line segment 101, in other words, the middle coil 1 and the peripheral coil 3 are connected into a whole by the coil connecting line segment 101, in this case, the middle coil 1 and the peripheral coil 3 are simultaneously energized, for example, in the application shown in fig. 3, the middle coil 1 heats the pan 99, and the peripheral coil 3 mainly serves only as a wire, in the application shown in fig. 4, the middle coil 1 and the peripheral coil 3 simultaneously and effectively heat the arc-bottom pan 98; or the central coil 1 and the peripheral coil 3 may also be wound separately by corresponding wires (as shown in fig. 14), so that in the application situation shown in fig. 3, the central coil 1 works and the peripheral coil 3 (power off) does not work; in the application shown in fig. 4, the central coil 1 and the peripheral coil 3 can be operated simultaneously, but of course, the central coil 1 and the peripheral coil 3 can also be operated alternately. High-temperature resistant materials such as a microcrystal plate, a ceramic plate, a silica gel piece, an aluminum piece, a mica piece and the like can be arranged between the middle coil 1 and the peripheral coil 3 and the cooker respectively to serve as supporting or isolating functions. The central coil 1 and the peripheral coil 3 may be respectively provided with at least one temperature control device 9, and fig. 1 and 2 show the case where the temperature control device 9 is disposed at a position corresponding to the center of the central coil 1 by way of example. The stop 11 can also be arranged on the central coil support 2.

In summary, the middle coil 1 and the peripheral coil 3 form a modular coil; the middle coil 1 and the peripheral coil 3 can be relatively lifted according to the use requirement, so that the shape of the modularized coil is changed to adapt to cookers (namely heated appliances) in different shapes, and the technical effect that the distance between the coil and the outer surface of the heated appliance is within the working distance range is achieved.