CN114433974A

CN114433974A - Resonant type gap induction heating head

Info

Publication number: CN114433974A
Application number: CN202210174881.3A
Authority: CN
Inventors: 王双玲; 赵坤; 雷剑利; 韦伟平
Original assignee: Dongguan Double Power Supply Technology Co ltd; Guangdong Yuecan Semiconductor Equipment Co ltd
Current assignee: Dongguan Double Power Supply Technology Co ltd; Guangdong Yuecan Semiconductor Equipment Co ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-05-06

Abstract

The invention discloses a resonant gap induction heating head, which comprises a resonant capacitor and a gap heating head, wherein the resonant capacitor comprises a capacitor, the gap heating head comprises a first heating part and a second heating part, the first heating part and the second heating part are electrically connected, and a gap for induction heating of an external workpiece is reserved between the first heating part and the second heating part; one electrode plate of the capacitor is connected with and conducted with the first heating part, and the other electrode plate of the capacitor is connected with and conducted with the second heating part. Compare in traditional reflow soldering and wave-soldering, the resonant gap induction heating head that adopts in this application not only structure is succinct, and when it was used in concrete welding scene, can gain high efficiency, accurate, stable welding effect.

Description

Resonant type gap induction heating head

Technical Field

The invention belongs to the technical field of electromagnetic induction, and particularly relates to an induction heating head.

Background

When the surface processing is carried out on a circuit board or other sectional materials with larger breadth, scenes needing to weld micro volume elements in batches often appear, the elements are often small in size, light in weight and large in quantity, each element often has an expected accurate welding position, and cannot be subjected to cold joint or wrong joint, so that the occasions have higher requirements on the welding processing.

Taking a Mini LED screen or a Micro LED screen as an example, in the manufacturing process, it is often necessary to perform a soldering process on a single LED light source, melt a solder correspondingly applied to a connection terminal of each LED light source, and solder the LED light sources on the backlight substrate in an array manner. In the process, the volume of a single LED light source is extremely small, the positioning requirement of the connecting terminal position is strict, and meanwhile, the whole Mini LED screen or Micro LED screen has a large breadth size relative to the single LED light source, and a large number of single LED light sources need to be arranged in an array form, so that how to deal with the large circuit scale, the single element with small volume is soldered to the expected position, which is a technical problem that must be solved by the skilled person.

In the prior art, reflow soldering or wave soldering is often adopted to solve the problems, when electronic components are soldered in batch in a reflow soldering mode, a proper amount of solder in a proper form needs to be dispensed at an expected soldering position of a PCB in advance, then surface mounting components are attached, and the solder is reflowed by an external heat source to meet the soldering requirement for group or point-by-point soldering; when electronic components are welded in batches by adopting a wave soldering mode, a tin bar is required to be placed in a tin furnace for wave soldering to form wave crest to component welding by molten soldering tin, namely molten soft soldering tin is required to be sprayed into a soldering tin wave required by design through an electric pump or an electromagnetic pump, and the molten soft soldering tin can also be formed by injecting nitrogen into a soldering tin pool, so that a printed board with components in advance passes through the soldering tin wave, and the soldering tin of mechanical and electrical connection between a soldering end or a pin of the components and a pad of the printed board is realized.

It should be noted that when the above-mentioned soldering form using reflow soldering or wave soldering is applied to a soldering process scenario of a specific micro volume component and a target profile, the soldering process often cannot achieve a desired processing effect: when the reflow soldering form is adopted for processing, the heating temperature is difficult to accurately regulate and control due to the structure of a reflow soldering furnace, and the condition that the temperature is not enough for the solder joint to melt incompletely or the temperature is too high for baking the section bar is easy to occur; the welding mode of wave soldering is often accompanied by the defect of high reject ratio of products, and the welding requirements of large quantity, small volume of a single component and accurate expected welding position are difficult to meet.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide an induction heating head, which provides a profile surface soldering operation for small-sized components by induction heating, overcomes the temperature control defect of the conventional reflow soldering with good temperature controllability, and overcomes the soldering accuracy control defect of the conventional wave soldering with good operation controllability.

Another object of the present invention is to provide a resonant induction heating head, which constructs the whole induction heating head in a resonant structure, reduces the requirements of the alternating frequency and the current amplitude of the external power output by induction heating, and safely, reliably, efficiently and surely ensures the induction heating effect.

Still another object of the present invention is to provide an induction heating head with a gap, which fully considers the requirements of small volume of the welding object and accurate expected welding position requirement in the form of the remaining gap on the heating head, and meets the requirement of batch small volume component welding processing on the surface of a circuit board or other profile with a larger breadth while ensuring the quality of induction heating processing.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a resonant gap induction heating head comprises a resonant capacitor and a gap heating head;

the gap heating head comprises a first heating part and a second heating part, the first heating part and the second heating part are electrically connected, and a gap for induction heating of an external workpiece is reserved between the first heating part and the second heating part; one electrode plate of the capacitor is connected with and conducted with the first heating part, and the other electrode plate of the capacitor is connected with and conducted with the second heating part.

The induction heating technology utilizes an electromagnetic induction method to enable the interior of a heated material to generate current, and achieves the heating purpose by means of the energy of eddy currents, concretely, in the technical scheme provided by the application, a capacitor is arranged in a resonant capacitor, two polar plates of the capacitor are connected with two ends of a gap heating head in a certain form, the capacitor which is electrically capacitive is connected with the gap heating head which is electrically inductive to form a resonant structure, the resonant structure has a corresponding inherent resonant frequency f in an electrical principle, the inherent resonant frequency f is determined by the size of capacitive reactance C of the capacitor and the size of inductive reactance L of the gap heating head, after the resonant capacitor is connected with the gap heating head, the resonant capacitor is connected with an external power supply, and the alternating frequency of alternating current output by the external power supply is f₀Adjusting the alternating frequency f of the external power supply₀So that f₀And f, the resonant structure formed by the joint of the resonant capacitor and the gap heating head is approximately in a resonant state, the resonant structure formed by the joint of the capacitor and the gap heating head is used as a current amplifier or a voltage amplifier, high-frequency large current or high-frequency large voltage is obtained at the first heating part and the second heating part of the gap heating head, and after the high-frequency large current or the high-frequency large voltage is converted into a high-frequency magnetic field by the first heating part and the second heating part, the external workpiece is inductively heated.

As can be seen from the principle of induction heating, the size of the current flowing through the gap heating head, the frequency, the distance between the heating head and the external workpiece, the type of the material of the external workpiece to be processed, and other factors directly, definitely and intuitively affect the heating effect, so that the skilled person can select the capacitor with the expected capacitive reactance size and the gap heating head with the expected inductive reactance size, and the two are connected to obtain the resonant structure with the expected resonant form and the expected inherent resonant frequency, and the gap heating head will be connected with the capacitor with the expected capacitive reactance size and the gap heating head with the expected inherent resonant frequencyWhen the device is applied to a specific processing process, a proper external driving mechanism drives the resonant structure to move to reach an expected processing position, and the alternating frequency f of an external power supply is correspondingly adjusted₀The working state of the resonant structure can be controlled, alternating current or alternating voltage with expected size is obtained at the gap heating head, further, an expected heating effect is obtained at the position of an external workpiece, the welding work of a single or single-row component is completed through single operation, the external driving mechanism is controlled to drive the resonant structure to move to the next station, and the operation is repeated until the welding processing of all the components is completed.

In the present invention, the gap heating head includes a first heating part and a second heating part, a gap is reserved between the first heating part and the second heating part, and it can be known through analysis that when an alternating current is input into the gap heating head, the alternating current is converted into an alternating magnetic field by the gap heating head, and due to the proximity effect of the alternating current when the first heating part and the second heating part are close to each other, the current flowing in the first heating part and the second heating part attract each other and tend to concentrate on the region around the gap for transmission, and the closer the first heating part and the second heating part are, the higher the alternating frequency of the alternating current is, the more the proximity effect is obvious, the more the current is concentrated, and the converted alternating magnetic field is concentrated in the space around the gap due to the current concentration on the region around the gap for transmission, so that it can be known that a reasonable gap shape and a gap width are provided, the alternating magnetic field with expected space shape and space distribution can be obtained, a thin and narrow space magnetic field is generated when single power-on is facilitated, only the solder entering the effective heating range can be heated and melted by induction of the space magnetic field, and then the pins of the components with extremely small size are accurately welded on the appointed position of the substrate. Therefore, it can be said that the skilled person only needs to adjust the alternating frequency f of the external power supply correspondingly after selecting the induction heating head with the desired capacitance and inductance to form the desired resonant structure₀Magnitude of current I₀Or magnitude of current U₀So as to control the heating effect correspondingly, and the structure of the capacitor and the gap heating head in the whole heating processThe formed resonance structure can correspondingly play a role in current amplification or voltage amplification, the requirement of the device on an external power supply is not high, and the whole welding process has good temperature controllability. And it is worth emphasizing that when the induction heating technology is adopted for welding, a closed welding space is not required to be constructed like a closed reflow oven which is required to be constructed when the reflow soldering mode is adopted for welding, but only an external power mechanism is required to carry the resonance structure to move, and after the resonance structure reaches the expected processing position, the solder at the position can be subjected to induction heating, which is also beneficial to simplifying the structure of the whole welding equipment.

In one implementation mode, the resonant capacitor further comprises a first copper sheet, a second copper sheet and a water-cooled tube; the first copper sheet is tightly attached to one polar plate of the capacitor and is electrically conducted with the polar plate, and the second copper sheet is tightly attached to the other polar plate of the capacitor and is electrically conducted with the other polar plate; the water-cooling pipe is tightly attached to the first copper sheet and/or the second copper sheet, and the water-cooling pipe is connected with the first copper sheet and/or the second copper sheet and keeps thermal conduction.

Furthermore, the resonant capacitor also comprises a first connecting seat, a second connecting seat, a first connecting rod and a second connecting rod; the first connecting seat is arranged between the first connecting rod and the first copper sheet, and the first connecting rod and the first copper sheet are connected and electrically conducted through the first connecting seat; the second connecting rod and the second copper sheet are connected and electrically conducted through the second connecting seat; the one end that the first extension rod deviates from first joint socket is connected with first heating portion and electrically conducted, and the one end that the second extension rod deviates from the second joint socket is connected with second heating portion and electrically conducted.

According to the mode, one polar plate of the capacitor is connected with the first heating part through the first copper sheet, the first connecting seat and the first connecting rod, the other polar plate of the capacitor is connected with the second heating part through the second copper sheet, the second connecting seat and the second connecting rod, the capacitor and the gap heating head are jointed to form a parallel resonance structure, and the inherent resonance frequency f of the parallel resonance structure is higher than the inherent resonance frequency f of the parallel resonance structure₁The natural resonant frequency is approximately:

when the parallel resonance structure is applied to an alternating current environmentWhen the alternating frequency f of the external power supply₀Approximating the natural resonant frequency f of the parallel resonant structure, obtaining f₀≈f₁When the parallel resonance structure is approximately in the resonance state, the parallel resonance structure has the characteristic of parallel resonance and has the corresponding quality factor Q₁The quality factor Q of₁The magnitude of the capacitance C is related to the inductance L of the gap heating head, when the parallel resonance structure approximately reaches the resonance state, the first heating part and the second heating part obtain alternating current which is times of the current at the output end of the external power supply, further, the ideal heating effect is obtained at the appointed position, the solder is melted, and the appointed component is welded on the appointed position.

Meanwhile, the first connecting seat, the first connecting rod, the first heating part, the second connecting rod and the second connecting seat are all provided with water flow passages for allowing external cooling water to flow, and after the connection, a through water passage from the water cooling pipe, the first connecting seat, the first connecting rod, the first heating part, the second connecting rod, the second connecting seat to the water cooling pipe is formed in the induction heating head. Capacitance and clearance heating head are at the course of the work, because circulation high frequency alternating current in turn, will inevitably produce a large amount of heats on it, adopt above-mentioned mode, construct the rivers passageway that link up between capacitance and clearance heating head, can utilize mobile external cooling water to provide continuous, timely, effectual cooling measure for this induction heating head, and long-time steady operation of holding device avoids its scaling loss.

In another implementation mode, the resonant capacitor further comprises a connecting shell and a connecting rod; the capacitor is arranged in the connecting shell, one polar plate of the capacitor is tightly attached to and electrically communicated with the side wall of the bottom side of the connecting shell, the gap heating head is arranged outside the connecting shell, and the first heating part is electrically communicated with the side wall of the top side of the connecting shell; the other electrode plate of the capacitor is connected and conducted with the second heating part through the connecting rod.

Furthermore, the resonance capacitor also comprises a transformer, and the transformer is also arranged in the connecting shell; the transformer comprises a magnetic ring and a primary winding, the magnetic ring is sleeved on the connecting rod in a penetrating mode, and the primary winding is wound on the magnetic ring.

According to the mode, the primary winding of the transformer is wound on the magnetic ring, the connecting rod penetrates through the magnetic ring, the transformer is integrally arranged in the connecting shell, the primary winding of the transformer is connected with an external power supply, and the external power supply is connected with the external power supply and has a certain alternating frequency f₀The connecting rod and the connecting shell will simultaneously act as a secondary winding of the transformer, inducing a voltage with a uniform alternating frequency f₀The transformer is arranged between the capacitor and the gap heating head, the capacitor is connected with the connecting shell and the gap heating head in a tail-end mode through the connecting rod, and analysis shows that the capacitor is connected with the gap heating head through the secondary winding of the transformer to form a series resonance structure.

Similarly, the series resonant structure formed by the connection of the capacitor and the gap heating head has the corresponding natural resonant frequency f₂The natural resonant frequency is

The series resonance structure is applied to an alternating current environment, and the primary winding of the transformer is introduced with an alternating frequency f₀When the alternating current is adopted, the secondary winding of the transformer is used for inducing the alternating current with the same frequency at the connecting rod, the induced alternating current is transmitted to one polar plate of a capacitor connected with the connecting rod, the alternating current is generated at the other polar plate of the capacitor under the action of the capacitor, the other polar plate of the capacitor is tightly attached to the side wall of the connecting shell, the alternating current is uniformly transmitted to the gap heating head along the connecting shell, and the alternating frequency of an external power supply is adjusted to be f₀When the alternating frequency f of the external power supply₀Approximating the natural resonant frequency f of the series resonant structure₂Then, the series resonant structure will reach its resonant state, and at this time, the series resonant structure will exhibit series resonance characteristics, and have its corresponding quality factor Q₂The quality factor Q of₂Is also related to the magnitude of the capacitive reactance C of the capacitor and the inductive reactance L of the gap heating head, and the first heating part and the second heating part will get multiple times when the series resonant structure reaches its resonant stateAnd the alternating current of the voltage at the output end of the external power supply further obtains ideal heating effect at the appointed position, melts the solder and welds the appointed component on the appointed position.

Because of the proximity effect of alternating current, the transmission process is biased to be transmitted from an upper-level component to a lower-level component along the shortest path, so that the traditional form that a single connecting wire is connected with a capacitor and an inductor to be combined into a series resonance structure is adopted, when the traditional form is specifically applied to an alternating current environment, current tends to be transmitted along a single and fixed path, and in the past, the part where the current is transmitted in a concentrated mode is easy to accumulate heat locally or even burn. By adopting the structure mode, the size of the device can be reduced to the maximum extent, the transformer, the capacitor and the gap heating head are connected into a series resonance structure skillfully, the sheet structure of the connecting shell can be used for connecting the capacitor and the gap heating head, uniform, spacious, multidirectional and anisotropic transmission paths are provided for current transmission, and the current is conveniently transmitted to the gap heating head from the other polar plate of the capacitor in a dispersed and uniform transmission state.

Meanwhile, the resonance capacitor further comprises at least one water cooling piece, the water cooling pieces are arranged relative to the capacitor, each water cooling piece is tightly attached to one of the pole plates of the capacitor and is in heat conduction with the pole plate, a water cooling channel for accommodating external cooling water is arranged in the inside of each water cooling piece, and cooling water circulating in the water cooling pieces can provide timely and efficient cooling measures for the capacitor.

In the technical scheme provided by the application, the gap heating head further comprises an insulating base; the insulating base is arranged on one side of the first heating part and the second heating part, which is deviated from the external workpiece, and the insulating base is detachably connected with the first heating part and the second heating part respectively.

And the clearance heating head is still including the mounting panel, and the mounting panel setting deviates from the one side of first heating portion and second heating portion at insulating base, and the mounting panel is connected with insulating base is detachable. The insulating base will provide firm, reliable structural support for the clearance heating head, avoids clearance heating head accumulated heat in the course of the work to warp, also can utilize its insulating properties to hinder alternating magnetic field to this side propagation, further guarantees that the alternating magnetic field that clearance heating head department produced is reliable and stable. And the mounting panel then provides the installation basis for whole induction heating head, and is internal, it can be in the same place clearance heating head and insulating base closed assembly to set up the mounting panel, become a stable in structure, can work whole that does not deform for a long time, and is external, it also can provide the structure basis of being connected with the clearance heating head for outside actuating mechanism to set up the mounting panel, be convenient for not destroying the structure of clearance heating head, do not hinder under the prerequisite of clearance heating head's work, be connected it with the outside drive structure, make things convenient for outside actuating mechanism to drive clearance heating head and arrive appointed processing position.

The invention has the advantages that: compare in traditional reflow soldering and wave-soldering, the resonant gap induction heating head that adopts in this application not only structure is succinct, and when it was used in concrete welding scene, can gain high efficiency, accurate, stable welding effect.

Drawings

Fig. 1 is a schematic diagram illustrating a resonant gap induction heating head according to an embodiment of the present invention connected to an external power source B via an external transmission line a.

Fig. 2 is a schematic diagram of an overall structure of a resonant gap induction heating head according to a first embodiment.

Fig. 3 is a schematic diagram illustrating an internal structure of a resonant gap induction heating head according to an embodiment.

Figure 4 is a schematic diagram of a gap heating tip in a resonant gap induction heating tip in accordance with one embodiment.

Fig. 5 is a schematic view of the overall structure of the resonant gap induction heating head according to the second embodiment.

Fig. 6 is a first perspective partial structure schematic diagram of a resonant gap induction heating head according to a second embodiment.

Fig. 7 is a second perspective partial structure diagram of a resonant gap induction heating head according to a second embodiment.

Fig. 8 is a schematic view of the overall structure of a resonant gap induction heating head according to a third embodiment.

Fig. 9 is a first structural view of a resonant capacitor in a resonant gap induction heating head according to a third embodiment.

Fig. 10 is a second structural view of a resonant capacitor in a resonant gap induction heating head according to a third embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

the first embodiment is as follows:

please refer to fig. 1-4.

In the present embodiment, a resonant gap induction heating head is provided, which includes a resonant capacitor 1 and a gap heating head 2, the resonant capacitor 1 is disposed above the gap heating head 2, one of the plates of the resonant capacitor 1 is connected to and electrically connected to one end of the gap heating head 2, and the other plate of the resonant capacitor 1 is connected to and electrically connected to the other end of the gap heating head 2.

Further, in the present embodiment, the resonant capacitor 1 includes a capacitor 11, a first copper sheet 12, a second copper sheet 13, and a water-cooled tube 14; the first copper sheet 12 is tightly attached to one polar plate of the capacitor 11, and the second copper sheet 12 is tightly attached to the other polar plate of the capacitor 11; the water-cooling pipe 14 is tightly attached to the first copper sheet 12 and/or the second copper sheet 13, and the water-cooling pipe 14 is connected with the first copper sheet 12 and/or the second copper sheet 13 and keeps thermal conduction.

Further, in this embodiment, the resonant capacitor 1 further includes a first adapter 15, a first adapter tube 16, a second adapter 17, and a second adapter tube 18; the first adapter 15 and the second adapter 17 are both arranged on one side of the capacitor 11, the first adapter 15 is connected with the first copper sheet 12 and keeps electric conduction, and the second adapter 17 is connected with the second copper sheet 13 and keeps electric conduction; a channel for circulating external cooling water is reserved inside each of the first adapter tube 16 and the second adapter tube 18, one end of the first adapter tube 16 is connected with the first adapter 15 and keeps electric conduction, and the other end of the first adapter tube is connected with one end of the gap heating head 2 and keeps electric conduction; one end of the second adapter tube 18 is connected with the second adapter 17 and keeps electric conduction, and the other end thereof is connected with the other end of the gap heating head 2 and keeps electric conduction; after connection, the water cooling pipe 14 is in water path communication with the first adapter pipe 16 and the second adapter pipe 18, respectively.

Further, in the present embodiment, the gap heating head 2 includes the first heating unit 21 and the second heating unit 22, the first heating unit 21 and the second heating unit 22 are kept in parallel, and the gap C for induction heating is left between the first heating unit 21 and the second heating unit 22.

Further, in the present embodiment, the gap heating head 2 further includes a connecting portion 23, a passage D for allowing external cooling water to flow is reserved inside each of the first heating portion 21, the second heating portion 22 and the connecting portion 23, the connecting portion 23 is disposed between the first heating portion 21 and the second heating portion 22, and the connecting portion 23 is connected to and electrically connected to the first heating portion 21 and the second heating portion 22, respectively; after the connection, a cooling water passage is formed through the first heating unit 21, the connection unit 23, and the second heating unit 22.

Further, in the present embodiment, an end of the first heating portion 21 away from the connecting portion 23 is connected to the first adapter tube 15 and kept electrically conductive; one end of the second heating part 22, which is far away from the connecting part 23, is connected with the second adapter tube 18 and keeps electric conduction; after the connection, a passage for allowing the external cooling water to flow therethrough is formed between the water cooling pipe 14, the first adapter pipe 16, the first heating unit 21, the connection unit 23, the second heating unit 22, and the second adapter pipe 18.

The second embodiment is as follows:

please refer to fig. 5-7.

In the present embodiment, a resonant gap induction heating head is provided, the induction heating head includes a resonant capacitor 1 'and a gap heating head 2', the resonant capacitor 1 'includes a capacitor 11', the gap heating head includes a first heating portion 21 'and a second heating portion 22', the first heating portion 21 'and the second heating portion 22' are electrically connected, and a gap for inductively heating an external workpiece is reserved between the first heating portion 21 'and the second heating portion 22'; one of the plates of the capacitor 11 'is connected to and conducted with the first heater 21', and the other plate of the capacitor 11 'is connected to and conducted with the second heater 22'.

Further, in this embodiment, the resonant capacitor 1 'further includes a first copper sheet 12', a second copper sheet 13 ', and a water-cooled tube 14'; the first copper sheet 12 'is tightly attached to and electrically connected with one of the plates of the capacitor 11', and the second copper sheet 13 'is tightly attached to and electrically connected with the other plate of the capacitor 11'; the water-cooled tube 14 'is tightly attached to the first copper sheet 12' and/or the second copper sheet 13 ', and the water-cooled tube 14' is connected with the first copper sheet 12 'and/or the second copper sheet 13' and keeps thermal conduction.

Further, in this embodiment, the resonant capacitor 1 ' further includes a first connection seat 15 ', a second connection seat 16 ', a first connection rod 17 ', and a second connection rod 18 '; the first connecting seat 15 'is arranged between the first connecting rod 17' and the first copper sheet 12 ', and the first connecting rod 17' and the first copper sheet 12 'are connected and electrically conducted through the first connecting seat 15'; the second connecting rod 18 ' is connected with the second copper sheet 13 ' through the second connecting seat 16 ' and is electrically conducted; one end of the first connecting rod 17 'away from the first connecting seat 15' is connected to and electrically connected to the first heating portion 21 ', and one end of the second connecting rod 18' away from the second connecting seat 16 'is connected to and electrically connected to the second heating portion 22'.

Further, in the present embodiment, each of the first receiving seat 15 ', the first connecting rod 17', the first heating portion 21 ', the second heating portion 22', the second connecting rod 18 ', and the second receiving seat 16' includes a water passage (not shown) for allowing external cooling water to flow therethrough, and after the connection, a through water passage extending from the water cooling tube 14 ', the first receiving seat 15', the first connecting rod 17 ', the first heating portion 21', the second heating portion 22 ', the second connecting rod 18', the second connecting seat 16 'to the water cooling tube 14' is formed inside the induction heating head.

Further, in the present embodiment, the gap heating head further includes an insulating base 23'; the insulating base 23 'is disposed on a side of the first heating part 21' and the second heating part 22 'away from the external workpiece, and the insulating base 23' is detachably connected to the first heating part 21 'and the second heating part 22', respectively.

Further, in the present embodiment, the gap heating head further includes a mounting plate 24 ', the mounting plate 24 ' is disposed on a side of the insulating base 23 ' away from the first heating portion 21 ' and the second heating portion 22 ', and the mounting plate 24 ' is detachably connected to the insulating base 23 '.

The third concrete implementation mode:

please refer to fig. 8-10.

In the present embodiment, a resonant gap induction heating head is provided, the induction heating head includes a resonant capacitor 1 ″ and a gap heating head 2 ″, the resonant capacitor 1 ″ includes a capacitor 11 ″, the gap heating head 2 ″ includes a first heating portion 21 ″ and a second heating portion 22 ″, the first heating portion 21 ″ and the second heating portion 22 ″ are electrically connected, and a gap for induction heating an external workpiece is reserved between the first heating portion 21 ″ and the second heating portion 22 ″; one plate of the capacitor 11 "is connected to and conducted with the first heating portion 21", and the other plate of the capacitor 11 "is connected to and conducted with the second heating portion 22".

Further, in the present embodiment, the resonant capacitor 2 ″ further includes a connecting shell 12 ″ and a connecting rod 13 ″; the capacitor 11 'is arranged in the connecting shell 12', one pole plate of the capacitor 11 'is tightly attached to and electrically connected with the bottom side wall of the connecting shell 12', the gap heating head 2 'is arranged outside the connecting shell 12', and the first heating part 21 'is electrically connected with the top side wall of the connecting shell 12'; the other plate of the capacitor 11 ' is connected and conducted with the second heating part 22 ' through the connecting rod 13 '.

Further, in the present embodiment, the resonant capacitor 1 ″ further includes a transformer 14 ″, and the transformer 14 ″ is also disposed in the connection shell 12 ″; the transformer 14 ' comprises a magnetic ring 141 ' and a primary winding 142 ', the magnetic ring 141 ' is sleeved on the connecting rod 142 ', and the primary winding 142 ' is coiled on the magnetic ring 141 '.

Further, in the present embodiment, the resonant capacitor 1 ″ further includes at least one water-cooling sheet 15 ″, the water-cooling sheet 15 ″ is disposed relative to the capacitor 11 ″, each water-cooling sheet 15 ″ is closely attached to one of the plates of the capacitor 11 ″ and is in thermal communication therewith, and a water-cooling channel for allowing external cooling water to flow is disposed in the interior of each water-cooling sheet 15 ″.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A resonant gap induction heating head is characterized in that the induction heating head comprises a resonant capacitor and a gap heating head, wherein the resonant capacitor comprises a capacitor;

the gap heating head comprises a first heating part and a second heating part, the first heating part and the second heating part are electrically connected, and a gap for inductively heating an external workpiece is reserved between the first heating part and the second heating part;

one electrode plate of the capacitor is connected with and conducted with the first heating part, and the other electrode plate of the capacitor is connected with and conducted with the second heating part.

2. A resonant gap induction heating head as set forth in claim 1 wherein said resonant capacitor further comprises a first copper sheet, a second copper sheet and a water cooled tube; the first copper sheet is tightly attached to one polar plate of the capacitor and is electrically communicated with the polar plate, and the second copper sheet is tightly attached to the other polar plate of the capacitor and is electrically communicated with the other polar plate; the water-cooled tube is tightly attached to the first copper sheet and/or the second copper sheet, and the water-cooled tube is connected with the first copper sheet and/or the second copper sheet and keeps thermal conduction.

3. A resonant gap induction heating head as set forth in claim 2 wherein said resonant capacitor further comprises a first connection seat, a second connection seat, a first connection rod and a second connection rod; the first connecting seat is arranged between the first connecting rod and the first copper sheet, and the first connecting rod and the first copper sheet are connected and electrically conducted through the first connecting seat; the second connecting rod and the second copper sheet are connected and electrically conducted through the second connecting seat; one end of the first connecting rod, which deviates from the first connecting seat, is connected with the first heating part and is electrically conducted, and one end of the second connecting rod, which deviates from the second connecting seat, is connected with the second heating part and is electrically conducted.

4. A resonant gap induction heating head according to claim 3, wherein each of said first pedestal, said first connection rod, said first heating portion, said second connection rod, and said second pedestal has a water passage for allowing external cooling water to flow therethrough, and after the connection, a water passage extending from said water-cooled tube, said first pedestal, said first connection rod, said first heating portion, said second connection rod, said second pedestal to said water-cooled tube is formed inside the induction heating head.

5. The resonant gap induction heating head of claim 1, wherein said resonant capacitor further comprises a connecting shell and a connecting rod; the capacitor is arranged in the connecting shell, one polar plate of the capacitor is tightly attached to and electrically communicated with the side wall of the bottom side of the connecting shell, the gap heating head is arranged outside the connecting shell, and the first heating part is electrically communicated with the side wall of the top side of the connecting shell; and the other electrode plate of the capacitor is connected and conducted with the second heating part through the connecting rod.

6. A resonant gap induction heating head according to claim 5, wherein said resonant capacitor further comprises a transformer, said transformer also being disposed in said connecting shell; the transformer comprises a magnetic ring and a primary winding, the magnetic ring is sleeved on the connecting rod in a penetrating mode, and the primary winding is wound on the magnetic ring.

7. A resonant gap induction heating head according to claim 6, wherein said resonant capacitor further comprises at least one water-cooling plate, said water-cooling plate is disposed opposite to said capacitor, each water-cooling plate is tightly attached to one of the plates of said capacitor and thermally connected thereto, and a water-cooling channel for circulating external cooling water is disposed in each water-cooling plate.

8. A resonant gap induction heating head according to claim 1, wherein said gap heating head further comprises an insulating base; the insulating base is arranged on one side, away from the external workpiece, of the first heating part and the second heating part, and the insulating base is detachably connected with the first heating part and the second heating part respectively.

9. A resonant gap induction heating head according to claim 8, further comprising a mounting plate disposed on a side of said insulating base opposite to said first heating portion and said second heating portion, said mounting plate being detachably connected to said insulating base.