Induction heating coil

Abstract

The application provides an induction heating coil, which comprises a first induction coil tube, a second induction coil tube, a third induction coil tube, a first pipe, a second pipe and a third pipe. The second induction coil tube and the first induction coil tube are communicated, and the first induction coil tube is used for conveying a cooling medium into the second induction coil tube. The third induction coil tube and the second induction coil tube are communicated, and the second induction coil tube is located between the first induction coil tube and the third induction coil tube. The first pipe and the first induction coil tube are communicated, and the first pipe is used for conveying the cooling medium into the first induction coil tube. The second pipe and the third induction coil tube are communicated, and the second pipe is used for conveying the cooling medium into the third induction coil tube. The third pipe and the third induction coil tube are communicated, and the third pipe is used for outputting the cooling medium in the second induction coil tube and the third induction coil tube. The application solves the problem of insufficient cooling of the existing induction coil.

Description

Technical Field

[0001] This application relates to the technical field of quenching apparatus, and in particular to an induction heating coil. Background Technology

[0002] With the electrification of automobiles, the instantaneous torque increases, placing higher demands on the strength of their driveshafts. This necessitates continuous scanning induction heating to harden the driveshaft surface, deepening the hardened layer to enhance strength. However, as the hardened layer depth increases, the processing efficiency of traditional single-coil and double-coil scanning induction heating significantly decreases, energy consumption increases dramatically, and the tendency for cracking increases significantly. Using a three-coil scanning induction heating method can improve processing efficiency and reduce energy consumption. However, due to the increased number of induction coils, the cooling medium in the three-coil design, using a traditional one-in-one-out method, is insufficient for adequate cooling of the induction coils. Therefore, conventional three-coil designs suffer from insufficient induction coil cooling. Summary of the Invention

[0003] The purpose of this application is to provide an induction heating coil to solve the problem of insufficient cooling in existing induction coils.

[0004] This application provides an induction heating coil, including a first induction coil tube, a second induction coil tube, a third induction coil tube, a first conduit, a second conduit, and a third conduit. The second induction coil tube is connected to the first induction coil tube, and the first induction coil tube is used to deliver a cooling medium to the second induction coil tube. The third induction coil tube is connected to the second induction coil tube, and the second induction coil tube is located between the first and third induction coil tubes. The first conduit is connected to the first induction coil tube, and the first conduit is used to deliver a cooling medium to the first induction coil tube. The second conduit is connected to the third induction coil tube, and the second conduit is used to deliver a cooling medium to the third induction coil tube. The third conduit is connected to the third induction coil tube, and the third conduit is used to output the cooling medium from the third and second induction coil tubes.

[0005] Optionally, the first conduit is disposed outside the first induction coil tube.

[0006] Optionally, the first pipe includes a first horizontal pipe and a first vertical pipe, the first horizontal pipe is connected to the first induction coil pipe, the first vertical pipe is connected to the end of the first horizontal pipe away from the first induction coil pipe, and the first vertical pipe and the first induction coil pipe are spaced apart.

[0007] Optionally, the second conduit is disposed outside the third induction coil tube.

[0008] Optionally, the second pipe includes a second horizontal pipe and a second vertical pipe, the second horizontal pipe is connected to the third induction coil pipe, the second vertical pipe and the second horizontal pipe are connected to one end away from the third induction coil pipe, and the second vertical pipe and the third induction coil pipe are spaced apart.

[0009] Optionally, the third conduit is offset outside the third induction coil tube.

[0010] Optionally, the inner diameter of the second induction coil tube is larger than the inner diameter of the first induction coil tube and larger than the inner diameter of the third induction coil tube.

[0011] Optionally, the first pipe and the starting end of the first induction coil tube are connected.

[0012] Optionally, the second pipe and the starting end of the third induction coil tube are connected.

[0013] Optionally, the starting end of the second induction coil tube is connected to the end of the first induction coil tube, and the end of the second induction coil tube is connected to the end of the third induction coil tube.

[0014] The beneficial effects of this application are as follows: It involves assembling a first induction coil tube, a second induction coil tube, a third induction coil tube, a first pipe, a second pipe, and a third pipe. The second induction coil tube is connected to the first induction coil tube, and the first induction coil tube is used to deliver cooling medium to the second induction coil tube. The third induction coil tube is connected to the second induction coil tube, and the second induction coil tube is located between the first and third induction coil tubes. The first pipe is connected to the first induction coil tube, and the first pipe is used to deliver cooling medium to the first induction coil tube.

[0015] The second pipe is connected to the third induction coil tube, and the second pipe is used to transport the cooling medium to the third induction coil tube. The third pipe is also connected to the third induction coil tube, and the third pipe is used to output the cooling medium from both the third and second induction coil tubes. Because two pipes, the first and second, are provided in the induction heating coil for inputting the cooling medium, a larger flow rate of cooling medium can be provided to the induction heating coil, while simultaneously shortening the flow path of the cooling medium and solving the problem of insufficient cooling in existing coils.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the following describes the application in detail with reference to the preferred embodiments and accompanying drawings. Attached Figure Description

[0017] Figure 1This is a schematic diagram illustrating the application of an induction heating coil in one embodiment of this application;

[0018] Figure 2 This is a perspective view of an induction heating coil in one embodiment of this application;

[0019] Figure 3 In one embodiment of this application, Figure 2 A magnified view from direction A;

[0020] Figure 4 This is a top view of an induction heating coil in one embodiment of this application;

[0021] Figure 5 This is a top cross-sectional view of the induction heating coil in one embodiment of this application (the cross-section is horizontal and passes through the second copper tube).

[0022] Figure 6 This is a top cross-sectional view of the induction heating coil in one embodiment of this application (the cross-section is horizontal and passes through the first copper tube).

[0023] Figure 7 This is a comparison diagram of the metallographic morphology of a shaft part quenched by a double-coil induction coil and the metallographic morphology of a shaft part quenched by an induction heating coil, according to one embodiment of this application.

[0024] In the attached figures, the following labels are used:

[0025] 10 Induction heating coil

[0026] 100 First induction coil tube

[0027] 101 Second Induction Coil Tube

[0028] 102 Third Induction Coil Tube

[0029] 103 First Pipeline

[0030] 1030 First horizontal tube

[0031] 1031 First Vertical Pipe

[0032] 104 Second Pipeline

[0033] 1040 Second horizontal tube

[0034] 1041 Second vertical pipe

[0035] 105 Third Pipeline

[0036] 1050 Third vertical pipe

[0037] 1051 bend

[0038] 106 First Copper Tube

[0039] 107 Second Copper Tube

[0040] 20 Shaft-type parts Detailed Implementation

[0041] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments. To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0044] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Please also refer to Figure 1 and Figure 2This embodiment provides an induction heating coil 10, including a first induction coil tube 100, a second induction coil tube 101, a third induction coil tube 102, a first conduit 103, a second conduit 104, and a third conduit 105. The second induction coil tube 101 is connected to the first induction coil tube 100, and the first induction coil tube 100 is used to deliver a cooling medium to the second induction coil tube 101. The third induction coil tube 102 is connected to the second induction coil tube 101, and the second induction coil tube 101 is located between the first induction coil tube 100 and the third induction coil tube 102. The first conduit 103 is connected to the first induction coil tube 100, and the first conduit 103 is used to deliver a cooling medium to the first induction coil tube 101. The second conduit 104 is connected to the third induction coil tube 102, and the second conduit 104 is used to deliver a cooling medium to the third induction coil tube 102. The third conduit 105 is connected to the third induction coil tube 102, and the third conduit 105 is used to output the cooling medium from the third induction coil tube 102 and the second induction coil tube 101.

[0046] Please also refer to Figure 1 and Figure 2 Because the induction heating coil 10 has two pipes, the first pipe 103 and the second pipe 104, for inputting the cooling medium, a larger flow rate of cooling medium can be provided to the induction heating coil 10. At the same time, the flow path of the cooling medium is shortened, solving the problem of insufficient cooling in existing coils. Moreover, the hardened layer morphology at the heat treatment starting position of the induction heating coil 10 in this embodiment is better, making metallographic adjustment easier.

[0047] Moreover, compared to traditional single-turn or double-turn scanning induction heating, the surface area of ​​the shaft part 20 processed per unit time by the induction heating coil 10 in this embodiment is larger than that of a double-turn coil, thus resulting in higher scanning heating efficiency. Furthermore, the higher magnetic induction intensity of the induction heating coil 10 in this embodiment also improves heating efficiency. Therefore, the induction heating coil in this embodiment has high processing efficiency and low energy consumption. The three-turn heating coil 10 in this embodiment allows for more dispersed heating of the shaft part 20, reducing stress concentration and minimizing the tendency for cracking in the shaft part 20.

[0048] Please also refer to Figure 1 and Figure 2An induction heating coil 10 is fitted onto the shaft-like part 20. The induction heating coil 10 is welded to a busbar. The busbar moves along with a movable device end (the device end can be the one that drives the induction coil, as shown in link: https: / / www.bilibili.com / video / BV1Nh411v7Vi / ?vd_source=90f27696169c5c33c2a6aa2f40519584). When the device end moves, it drives the induction heating coil 10 to scan and heat the shaft-like part 20.

[0049] like Figure 2 As shown, the first induction coil tube 100 is cylindrical and annular, and its material is copper (e.g., pure copper, the same below). The longitudinal section of the first induction coil tube 100 is rectangular, and the first induction coil tube 100 includes an internal cavity in which the cooling medium can flow. The starting end and the ending end of the first induction coil tube 100 are spaced apart from each other. The space between the starting end and the ending end of the first induction coil tube 100 is filled with an insulating material such as polytetrafluoroethylene. The right side of the starting end of the first induction coil tube 100 is closed. The left side of the ending end of the first induction coil tube 100 is closed.

[0050] like Figure 2 As shown, the second induction coil tube 101 is cylindrical and annular, and its material is copper. The longitudinal section of the second induction coil tube 101 is rectangular, and the second induction coil tube 101 includes an internal cavity in which the cooling medium can flow. The starting end and the ending end of the second induction coil tube 101 are spaced apart from each other. The space between the starting end and the ending end of the second induction coil tube 101 is filled with an insulating material such as polytetrafluoroethylene. The right side of the starting end of the second induction coil tube 101 is closed. The left side of the ending end of the second induction coil tube 101 is closed.

[0051] Please also refer to Figure 2 and Figure 3 The second induction coil tube 101 is located above the first induction coil tube 100. The second induction coil tube 101 is connected to the first induction coil tube 100 by welding. For example, the second induction coil tube 101 is connected to the first induction coil tube 100 through a first copper tube 106. That is, the bottom end and the top end of the first copper tube 106 are welded to the top end of the first induction coil tube 100 and the bottom end of the second induction coil tube 101, respectively. Except for the connection with the first induction coil tube 100 at the first copper tube 106, the other parts of the second induction coil tube 101 are spaced apart from the first induction coil tube 100. An insulating material such as polytetrafluoroethylene is provided between the second induction coil tube 101 and the first induction coil tube 100.

[0052] like Figure 2As shown, the third induction coil tube 102 is cylindrical and annular, and its material is copper. The longitudinal section of the third induction coil tube 102 is rectangular, and the third induction coil tube 102 includes an internal cavity in which the cooling medium can flow. The starting end and the ending end of the third induction coil tube 102 are spaced apart from each other. The space between the starting end and the ending end of the third induction coil tube 102 is filled with an insulating material such as polytetrafluoroethylene. The left side of the starting end and the right side of the ending end of the third induction coil tube 102 are closed.

[0053] Please also refer to Figure 2 and Figure 3 The third induction coil tube 102 is located above the second induction coil tube 101. The third induction coil tube 102 is connected to the second induction coil tube 101 by welding. For example, the third induction coil tube 102 is connected to the second induction coil tube 101 through a second copper tube 107. That is, the bottom end and the top end of the second copper tube 107 are welded to the top end of the second induction coil tube 101 and the bottom end of the third induction coil tube 102, respectively. Except for the connection with the second induction coil tube 101 at the second copper tube 107, the other parts of the third induction coil tube 102 are spaced apart from the second induction coil tube 101. An insulating material such as polytetrafluoroethylene is provided between the second induction coil tube 101 and the first induction coil tube 100. The first induction coil tube 100, the second induction coil tube 101, and the third induction coil tube 102 are coaxially arranged.

[0054] like Figure 2 As shown, the first pipe 103 has an L-shaped orientation and is made of copper. The cross-section of the first pipe 103 is rectangular. The bottom end of the first pipe 103 is connected to the first induction coil tube 100 by welding. The top end of the first pipe 103 is connected to the cooling medium storage tank via a first conduit. The cooling medium storage tank is preferably a stainless steel water tank. The first conduit is welded to the manifold and thereby connected to the manifold A. The manifold A is bolted to the equipment end. The first pipe 103 is powered by an induction heating power supply through the manifold A. The cooling medium is preferably deionized water.

[0055] like Figure 2 As shown, the second pipe 104 is L-shaped and made of copper. The cross-section of the second pipe 104 is rectangular. The bottom end of the second pipe 104 is welded to the third induction coil tube 102. The top end of the second pipe 104 is connected to the cooling medium storage tank via a second pipe. The second pipe is welded to the manifold and thereby connected to the manifold B. The manifold B is bolted to the equipment end. The second pipe 104 is powered by the induction heating power supply through the manifold B. The cooling medium storage tank supplies cooling medium to the first pipe 103 and the second pipe 104 via a circulating pump. The ends of the second pipe 104 and the third induction coil tube 102 are spaced apart.

[0056] Please also refer to Figure 2 and Figure 3 The third pipe 105 is made of copper. The third pipe 105 includes a third vertical pipe 1050 and a bend 1051. The bottom end of the third vertical pipe 1050 is welded to the end of the third induction coil tube 102 and the end of the second induction coil tube 101. The cross-section of the third vertical pipe 1050 is rectangular. The top end of the third vertical pipe 1050 is welded to the bottom end of the bend 1051. The cross-section of the bend 1051 is circular. The top end of the bend 1051 is welded to the third pipe. The top end of the bend 1051 is connected to the cooling medium storage tank through the third pipe. The bend 1051 is angled and twisted towards the outside of the third induction coil tube 102. The cooling medium that has cooled the induction heating coil 10 flows back to the cooling medium storage tank via the bend 1051.

[0057] like Figure 1 As shown, the comparison data of quenching tests conducted on shaft parts 20 using a double-coil induction coil and the induction heating coil 10 in this example are shown in the table below: Double-coil induction coil 470 6534 33 7 3 50% In this embodiment, the induction heating coil 10 470 5876 30 7 3 0

[0058] Please also refer to Figure 1 and Figure 2 Optionally, the first conduit 103 is disposed outside the first induction coil tube 100. This keeps the first conduit 103 away from the shaft-like part 20, preventing the generation of induced eddy currents on the shaft-like part 20. Moreover, this arrangement prevents the first conduit 103 from interfering with the passage of the shaft-like part 20 during scanning. The first conduit 103 extends radially outward along the first induction coil tube 100.

[0059] Please also refer to Figure 2 and Figure 3 Optionally, the first conduit 103 includes a first horizontal pipe 1030 and a first vertical pipe 1031. The first horizontal pipe 1030 is connected to the first induction coil tube 100, and the first vertical pipe 1031 is connected to the end of the first horizontal pipe 1030 away from the first induction coil tube 100. The first vertical pipe 1031 and the first induction coil tube 100 are spaced apart. This arrangement allows the first vertical pipe 1031 to be located away from the first induction coil tube 100.

[0060] Please also refer to Figure 2 and Figure 3The inner end of the first horizontal tube 1030 is connected to the outer wall of the starting end of the first induction coil tube 100 by welding. The outer end of the first horizontal tube 1030 is welded to the bottom end of the first vertical tube 1031 by welding. The central axis of the first horizontal tube 1030 is perpendicular to the central axis of the first vertical tube 1031 and the central axis of the first induction coil tube 100. The top end of the first vertical tube 1031 is welded to the first pipeline. The top end of the first vertical tube 1031 is connected to the cooling medium storage tank through the first pipeline.

[0061] Please also refer to Figure 1 and Figure 2 Optionally, the second conduit 104 is disposed outside the third induction coil tube 102. This keeps the second conduit 104 away from the shaft-like part 20, preventing the generation of induced eddy currents on the shaft-like part 20. Moreover, this arrangement prevents the second conduit 104 from interfering with the passage of the shaft-like part 20 during scanning. The second conduit 104 extends radially outward along the third induction coil tube 102.

[0062] Please also refer to Figure 2 and Figure 3 Optionally, the second conduit 104 includes a second horizontal pipe 1040 and a second vertical pipe 1041. The second horizontal pipe 1040 is connected to the third induction coil pipe 102. The ends of the second vertical pipe 1041 and the second horizontal pipe 1040 that are away from the third induction coil pipe 102 are connected. The second vertical pipe 1041 and the third induction coil pipe 102 are spaced apart. This arrangement allows the second vertical pipe 1041 to be located away from the third induction coil pipe 102.

[0063] Please also refer to Figure 2 and Figure 3 The inner end of the second horizontal tube 1040 is connected to the outer wall of the starting end of the third induction coil tube 102 by welding. The outer end of the second horizontal tube 1040 is welded to the bottom end of the second vertical tube 1041 by welding. The central axis of the second horizontal tube 1040 is perpendicular to the central axis of the second vertical tube 1041 and the central axis of the third induction coil tube 102. The top end of the second vertical tube 1041 is welded to the second pipeline. The top end of the second vertical tube 1041 is connected to the cooling medium storage tank through the second pipeline.

[0064] Please also refer to Figure 1 and Figure 2 Optionally, the third conduit 105 is offset outside the third induction coil tube 102. This arrangement prevents the third conduit 105 from interfering with the passage of the shaft-like part 20 during scanning. The third conduit 105 is inclined relative to the third induction coil tube 102.

[0065] Please also refer to Figures 4 to 7Optionally, the inner diameter D2 of the second induction coil tube 101 is larger than the inner diameter D1 of the first induction coil tube 100 and larger than the inner diameter D3 of the third induction coil tube 102. With this configuration, the metallographic morphology of the shaft part 20 after quenching is better (e.g., easier to adjust, higher efficiency in first-piece metallographic testing), and the metallographic adjustment difficulty is comparable to that of a double-coil induction coil. A comparison is made between the metallographic morphology of the shaft part 20 after quenching using the induction heating coil 10 in this embodiment and the metallographic morphology of the shaft part 20 after quenching using a double-coil induction coil. Figure 7 As shown.

[0066] like Figure 2 As shown, optionally, the first pipe 103 and the starting end of the first induction coil tube 100 are connected. With this configuration, the cooling medium in the first pipe 103 can be input from the starting end of the first induction coil tube 100, pass through the first copper pipe 106 into the second induction coil 101, and then flow through the second copper pipe 107 to the third vertical pipe 1050, without needing to pass through the third induction coil 102 and being directly output through the third pipe 105. This shortens the flow length of the cooling medium in the induction coil 10, and the cooling medium flows and transfers heat in the first induction coil tube 100 and the second induction coil 101, facilitating the rapid suppression of the temperature rise (i.e., temperature increase, hereinafter the same) of the first induction coil tube 100 and the second induction coil 101.

[0067] like Figure 2 As shown, optionally, the second pipe 104 and the starting end of the third induction coil tube 102 are connected. With this configuration, the cooling medium in the second pipe 104 can be input from the starting end of the third induction coil tube 102, which can shorten the flow length of the cooling medium in the third induction coil tube 102. The cooling medium flows and transfers heat in the third induction coil tube 102, which facilitates the rapid suppression of the temperature rise of the third induction coil tube 102.

[0068] like Figure 2 As shown, optionally, the starting end of the second induction coil tube 101 is connected to the end of the first induction coil tube 100, and the end of the second induction coil tube 101 is connected to the end of the third induction coil tube 102. With this configuration, the cooling medium in the first induction coil tube 100 can flow in from the starting end of the second induction coil tube 101 and out from the end of the second induction coil tube 101, transferring heat through the full length of the cooling medium within the second induction coil tube 101, thus facilitating rapid suppression of the temperature rise of the second induction coil tube 101. The first copper tube 106 connects the starting end of the second induction coil tube 101 and the end of the first induction coil tube 100. The second copper tube 107 connects the end of the second induction coil tube 101 and the end of the third induction coil tube 102.

[0069] Please also refer to Figure 1 and Figure 2The working principle of the induction heating coil 10 is as follows: When quenching the shaft part 20 is required, the shaft part 20 is first inserted through the first induction coil tube 100, the second induction coil tube 101, and the third induction coil tube 102. The two ends of the shaft part 20 are fixed to the two centers of the machine tool.

[0070] Please also refer to Figure 1 and Figure 2 Current and cooling medium are passed through the first induction coil tube 100 and the third induction coil tube 102. The cooling medium enters through two paths (the flow direction of the cooling medium is as follows). Figure 2 (As shown by the unidirectional arrow in the diagram). A cooling medium flows from the starting end of the first induction coil tube 100 to the end of the first induction coil tube 100 via the first pipe 103, then flows from the end of the first induction coil tube 100 to the starting end of the second induction coil tube 101, then flows from the starting end of the second induction coil tube 101 to the end of the second induction coil tube 101, and then flows from the end of the second induction coil tube 101 to the end of the third induction coil tube 102.

[0071] Please also refer to Figure 1 and Figure 2 Another cooling medium flows from the beginning to the end of the third induction coil tube 102. The two cooling media converge at the end of the third induction coil tube 102 (i.e., converge in the third vertical pipe 1050) and return to the cooling medium storage tank via the third pipe. When heating the shaft part 20, the servo motor on the machine tool can drive the device end to scan from bottom to top along an axis parallel to the shaft part 20 (scanning direction as shown). Figure 1 (As shown by the unidirectional arrow in the image), which in turn drives the induction heating coil 10 to scan the shaft part 20 from bottom to top. The shaft part 20 is gradually heated to a suitable temperature starting from the initial area requiring induction heat treatment. Quenching liquid is then gradually sprayed onto the heated area of ​​the shaft part 20 through a sprayer to quickly cool and complete the quenching. Both heating and spraying are driven synchronously by a servo motor.

[0072] The induction heating coils provided in the embodiments of this application have been described in detail above. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application. All equivalent modifications or changes made in accordance with the spirit and technical concept of this application should still be covered by the claims of this application.

Claims

1. An induction heating coil, characterized in that, include: First induction coil tube; The second induction coil tube is connected to the first induction coil tube, and the first induction coil tube is used to deliver the cooling medium to the second induction coil tube. The third induction coil tube is connected to the second induction coil tube, and the second induction coil tube is located between the first induction coil tube and the third induction coil tube; A first pipe is connected to the first induction coil tube, and the first pipe is used to deliver a cooling medium to the first induction coil tube. The second pipe is connected to the third induction coil tube, and the second pipe is used to deliver cooling medium to the third induction coil tube; The third pipe is connected to the third induction coil tube, and the third pipe is used to output the cooling medium in the third induction coil tube and the second induction coil tube.

2. The induction heating coil according to claim 1, characterized in that, The first pipe is located outside the first induction coil tube.

3. The induction heating coil according to claim 1, characterized in that, The first pipe includes a first horizontal pipe and a first vertical pipe. The first horizontal pipe is connected to the first induction coil pipe. The first vertical pipe is connected to the end of the first horizontal pipe away from the first induction coil pipe. The first vertical pipe and the first induction coil pipe are spaced apart.

4. The induction heating coil according to claim 1, characterized in that, The second pipe is located outside the third induction coil tube.

5. The induction heating coil according to claim 1, characterized in that, The second pipe includes a second horizontal pipe and a second vertical pipe. The second horizontal pipe is connected to the third induction coil pipe. The second vertical pipe and the second horizontal pipe are connected at the ends away from the third induction coil pipe. The second vertical pipe and the third induction coil pipe are spaced apart.

6. The induction heating coil according to claim 1, characterized in that, The third conduit is offset to the outside of the third induction coil tube.

7. The induction heating coil according to claim 1, characterized in that, The inner diameter of the second induction coil tube is larger than the inner diameter of the first induction coil tube and larger than the inner diameter of the third induction coil tube.

8. The induction heating coil according to claim 1, characterized in that, The first pipe and the starting end of the first induction coil tube are connected.

9. The induction heating coil according to claim 1, characterized in that, The second pipe and the starting end of the third induction coil tube are connected.

10. The induction heating coil according to claim 1, characterized in that, The starting end of the second induction coil tube is connected to the end of the first induction coil tube, and the end of the second induction coil tube is connected to the end of the third induction coil tube.

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