Non-contact induction heating device for turbine bolts

Abstract

This application relates to the technical field of non-contact induction heating equipment for turbine bolts. The non-contact induction heating equipment for turbine bolts includes a heating body, an induction heating component, a water-cooling component, and a control component. The heating body is equipped with a display screen, buttons, knobs, a handle, and a heating output pipe. The handle is rotatably connected to the heating body via a rotating column. The induction heating component includes an induction coil disposed inside the heating output pipe, which is used for non-contact induction heating of the turbine bolts. The water-cooling component includes a water-cooling box, a semiconductor cooler, a semiconductor cooling chip, a circulating pump, a water-cooling pipe, a conduit, and a circulation pipe. The semiconductor cooling chip is disposed inside the water-cooling box, and the semiconductor cooler is electrically connected to the semiconductor cooling chip. The non-contact induction heating equipment for turbine bolts described in this invention is convenient to heat and has good performance.

Description

Technical Field

[0001] This application relates to the technical field of non-contact induction heating equipment for turbine bolts, and in particular to non-contact induction heating equipment for turbine bolts. Background Technology

[0002] During the installation and maintenance of steam turbines, the tightening and loosening of turbine bolts is a critical process. Usually, the bolt body needs to be heated to cause thermal elongation, thereby obtaining a greater preload and ensuring the sealing and operational stability of the steam turbine.

[0003] Traditional bolt heating methods primarily employ resistance heating rods. The heating core is made of 0Cr27A17Mo2 high-resistance heating alloy wire, with an operating temperature reaching 400℃. The protective sleeve is made of 1Cr18Ni9Ti heat-resistant stainless steel, with a cold insulation resistance greater than 500Ω and a hot insulation resistance greater than 10Ω. This type of heating rod generates heat by the flow of current through the resistance wire, which is then conducted to the bolt body to achieve heating.

[0004] However, traditional resistance heating methods have obvious drawbacks:

[0005] Low heating and cooling efficiency: Heating a single bolt takes 20-30 minutes, and cooling takes a similarly long time, which seriously affects the efficiency of turbine maintenance.

[0006] High energy consumption: Resistance heating has low electrical energy to heat energy conversion efficiency and high power consumption, which does not meet the national energy conservation and emission reduction requirements;

[0007] Poor equipment reliability: The heating wire inside the heating rod is prone to melting, short circuit, or even combustion, resulting in a high failure rate and easy damage to the equipment;

[0008] Limitations of contact heating: The heating rod needs to be inserted into the bolt hole, which is cumbersome and can easily damage the bolt hole. Those skilled in the art have provided a non-contact induction heating device for turbine bolts to solve the problems mentioned in the background art. Summary of the Invention

[0009] To address the problems mentioned in the background art, this application provides a non-contact induction heating device for steam turbine bolts.

[0010] The non-contact induction heating device for turbine bolts provided in this application adopts the following technical solution:

[0011] A non-contact induction heating device for turbine bolts, comprising a heating body, an induction heating component, a water-cooling component, and a control component;

[0012] The heating body is equipped with a display screen, buttons, knobs, a handle, and a heating output tube. The handle is rotatably connected to the heating body via a rotating column.

[0013] The induction heating assembly includes an induction coil disposed inside the heating output tube, and the induction coil is used for non-contact induction heating of the turbine bolts;

[0014] The water-cooled cooling assembly includes a water-cooled box, a thermoelectric cooler, a thermoelectric cooling chip, a circulating pump, water-cooled pipes, conduits, and a circulation pipe. The thermoelectric cooling chip is disposed inside the water-cooled box, and the thermoelectric cooler is electrically connected to the thermoelectric cooling chip. The circulating pump is disposed inside the water-cooled box and is connected to the water-cooled pipes through conduits. The water-cooled pipes are wound around the inner wall of the heating output pipes, and the circulation pipes connect the water-cooled pipes to the water-cooled box to form a cooling circulation loop.

[0015] The control components are electrically connected to the display screen, buttons, knobs, induction coils, semiconductor coolers, and circulating pumps, respectively, and are used to control the heating temperature, cooling efficiency, and equipment operating status.

[0016] Preferably, the induction coil is wound uniformly along the axial direction of the heating output tube, and the water-cooling tube and the induction coil are arranged alternately on the inner wall of the heating output tube.

[0017] Preferably, there are multiple semiconductor cooling chips, which are evenly distributed at the bottom of the water-cooled box, and the semiconductor cooler is disposed on the outside of the water-cooled box and connected to the semiconductor cooling chips accordingly.

[0018] Preferably, the handle can be folded and stored in the side wall of the heating body via a rotating column, and the rotating column is hinged to the heating body.

[0019] Preferably, the control components include a temperature control module, a cooling control module, and a display module. The temperature control module adjusts the heating power of the induction coil via knobs and buttons. The cooling control module controls the start and stop of the semiconductor cooler and the circulating pump. The display module displays the heating temperature, cooling water temperature, and equipment operating parameters in real time via a display screen.

[0020] Preferably, the heating output tube is a high-temperature resistant insulating tube, and a heat insulation layer is provided between the induction coil and the inner wall of the heating output tube.

[0021] Preferably, the circulating pump delivers the cooling medium from the water-cooled box to the water-cooled pipe through a conduit, and the cooling medium flows back to the water-cooled box through the circulating pipe, thereby achieving circulating cooling of the heating output pipe and the induction coil.

[0022] In summary, this application includes the following beneficial technical effects: The working principle of the ultra-high frequency (UHF) induction bolt heater is mainly based on Faraday's law of electrical induction. When an alternating current passes through the induction coil, an alternating magnetic field is generated. When a conductor (such as a bolt) is placed in this magnetic field, an induced current, i.e., eddy current, is generated inside the conductor. These eddy currents cause the conductor molecules to vibrate and rub against each other, thereby generating heat and achieving a heating effect. This heating method can heat bolt components very quickly because the eddy currents are concentrated on the surface layer of the metal; this phenomenon is called the skin effect, which causes heat to be generated mainly on the metal surface. An induction heating system typically includes an induction coil, an AC power supply, and the workpiece to be heated. By controlling the frequency and intensity of the AC power, various metal materials can be effectively heated.

[0023] The advantage of electromagnetic induction heating lies in its ability to heat objects quickly and efficiently. Its main advantages include the following characteristics:

[0024] 1. Rapid Heating: Electromagnetic induction heating utilizes the alternating magnetic flux of an electromagnetic field to generate an induced current, converting electrical energy into heat energy, thereby achieving rapid heating. Compared to traditional constant-temperature heating, electromagnetic induction heating offers adjustable power, rapid start-up and shutdown, and faster response speed, which can improve production efficiency and processing accuracy.

[0025] 2. High efficiency and energy saving: Electromagnetic induction heating has a high energy conversion efficiency, with an energy utilization rate of over 95%. Compared with heat transfer methods such as resistance wire, hot air, and steam, it has less energy loss and a very significant energy-saving effect.

[0026] 3. Safe and reliable: Electromagnetic induction heating does not require an external heat source and does not produce flames or gas, thus having very high safety and reliability.

[0027] 4. Environmentally friendly and healthy: There are no combustion products during the electromagnetic induction heating process, and no harmful substances such as waste gas, wastewater, or odor are produced, resulting in very little pollution to the environment and air. Furthermore, it does not generate electromagnetic radiation that could affect human health.

[0028] 5. Precise Control: Electromagnetic induction heating allows for precise control of the heated object by adjusting process parameters, power levels, and time. This results in advantages such as high temperature accuracy and uniform heating, making it a promising application for heating products requiring fine machining and complex processes. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the non-contact induction heating device for turbine bolts in an embodiment of this application;

[0030] Figure 2This is a schematic diagram of the heating output pipe structure of the non-contact induction heating device for turbine bolts in an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the water-cooled box structure of the non-contact induction heating device for turbine bolts in an embodiment of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Heating body; 2. Display screen; 3. Button; 4. Knob; 5. Rotating column; 6. Handle; 7. Water-cooled box; 8. Semiconductor cooler; 9. Heating output tube; 10. Induction coil; 11. Water-cooled tube; 12. Circulation pump; 13. Conduit; 14. Semiconductor cooler; 15. Circulation tube. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] The illustrative embodiments and descriptions of the present invention are provided herein to explain the invention, but are not intended to limit the invention.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] It should be understood that the terms "comprising / including," "consisting of," or any other variations are intended to cover non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrases "comprising / including," "consisting of," does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.

[0037] It should also be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device, component or structure referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] like Figures 1-3 As shown, the non-contact induction heating device for turbine bolts includes a heating body 1, an induction heating component, a water-cooling component, and a control component;

[0040] The heating body 1 is equipped with a display screen 2, a button 3, a knob 4, a handle 6 and a heating output tube 9. The handle 6 is rotatably connected to the heating body 1 via a rotating column 5.

[0041] The induction heating assembly includes an induction coil 10 disposed inside the heating output tube 9, which is used for non-contact induction heating of the turbine bolts;

[0042] The water-cooled cooling assembly includes a water-cooled box 7, a thermoelectric cooler 8, a thermoelectric cooler chip 14, a circulating pump 12, a water-cooled pipe 11, a conduit 13, and a circulation pipe 15. The thermoelectric cooler chip 14 is disposed inside the water-cooled box 7. The thermoelectric cooler 8 is electrically connected to the thermoelectric cooler chip 14. The circulating pump 12 is disposed inside the water-cooled box 7 and is connected to the water-cooled pipe 11 through the conduit 13. The water-cooled pipe 11 is wound around the inner wall of the heating output pipe 9. The circulation pipe 15 connects the water-cooled pipe 11 to the water-cooled box 7 to form a cooling circulation loop.

[0043] The control components are electrically connected to the display screen 2, button 3, knob 4, induction coil 10, semiconductor cooler 8 and circulation pump 12 respectively, and are used to control heating temperature, cooling efficiency and equipment operating status.

[0044] In this embodiment, the induction coil 10 is wound uniformly along the axial direction of the heating output tube 9, and the water cooling tube 11 and the induction coil 10 are arranged alternately on the inner wall of the heating output tube 9.

[0045] In this embodiment, there are multiple semiconductor cooling chips 14, which are evenly distributed at the bottom of the water-cooled box 7, and the semiconductor cooler 8 is disposed on the outside of the water-cooled box 7 and connected to the semiconductor cooling chips 14.

[0046] In this embodiment, the handle 6 can be folded and stored in the side wall of the heating body 1 via the rotating column 5, and the rotating column 5 is hinged to the heating body 1.

[0047] In this embodiment, the control components include a temperature control module, a cooling control module, and a display module. The temperature control module adjusts the heating power of the induction coil 10 through the knob 4 and the button 3. The cooling control module controls the start and stop of the semiconductor cooler 8 and the circulating pump 12. The display module displays the heating temperature, cooling water temperature, and equipment operating parameters in real time through the display screen 2.

[0048] In this embodiment, the heating output tube 9 is a high-temperature resistant insulating tube, and a heat insulation layer is provided between the induction coil 10 and the inner wall of the heating output tube 9.

[0049] In this embodiment, the circulating pump 12 delivers the cooling medium in the water-cooled box 7 to the water-cooled pipe 11 through the conduit 13. The cooling medium then flows back to the water-cooled box 7 through the circulating pipe 15, thereby achieving circulating cooling of the heating output pipe 9 and the induction coil 10.

[0050] The implementation principle of the non-contact induction heating device for turbine bolts in this application embodiment is as follows: This non-contact induction heating device for turbine bolts works in conjunction with Faraday's law of electromagnetic induction and the closed-loop water cooling principle. After the device is connected to 380V, 50 / 60Hz power frequency AC, the AC is first converted to DC by the internal rectifier circuit of the heating body 1, and then the DC is inverted into 20-250KHz ultra-high frequency / ultra-high voltage current by the inverter circuit. When this high-frequency high-voltage current flows through the induction coil 10 uniformly wound axially inside the heating output tube 9, it generates a high-speed changing alternating magnetic field around the coil. When the magnetic metal material of the turbine bolt to be heated is placed in the alternating magnetic field of the heating output tube 9, the magnetic lines of force of the alternating magnetic field cut the bolt conductor, forming countless closed micro-eddy current loops inside the bolt. Under the action of the bolt's own resistance, the eddy currents cause the metal molecules to vibrate and rub violently, directly converting electrical energy into heat energy, realizing non-contact self-heating. Due to the skin effect, the eddy currents are concentrated on the bolt surface within 0.1-2mm. Within the specified range, heat is rapidly conducted inwards, significantly improving heating efficiency. Simultaneously, to prevent damage to the induction coil 10 and heating output tube 9 due to continuous high temperatures, the equipment's closed-loop water-cooling system is activated. The circulating pump 12 delivers deionized water or a dedicated coolant from the water-cooled box 7 via conduit 13 to the water-cooling pipe 11, which is wound around the outer wall of the heating output tube 9 and interleaved with the induction coil 10. As the cooling medium flows within the water-cooling pipe 11, it exchanges heat with the pipe wall, efficiently absorbing the residual heat from the induction coil 10 and heating output tube 9. After absorbing heat, the cooling medium flows back to the water-cooled box 7 via the circulating pipe 15, where it is rapidly cooled by the semiconductor cooling plates 14 evenly distributed at the bottom of the water-cooled box 7. The semiconductor cooler 8 utilizes the Peltier effect to rapidly transfer heat from one side of the cooling plate to the other when energized, maintaining the medium temperature within the water-cooled box 7 within a safe range, typically ≤40℃. The control components will adjust the temperature based on feedback from the temperature sensor within the water-cooled box 7. The system automatically adjusts the cooling power of the semiconductor cooler 8 and the speed of the circulating pump 12. Simultaneously, it combines the collected current and voltage signals from the induction coil 10 with bolt temperature feedback. The frequency and amplitude of the high-frequency current are dynamically adjusted via buttons 3 and knobs 4. When the bolt temperature approaches the target value, the high-frequency current power is reduced to prevent overheating. Parameters such as heating temperature and holding time can also be preset. The operating status is displayed in real-time on the display screen 2 to achieve automated and precise temperature control. After heating is complete, the induction coil 10 is de-energized, but the circulating pump 12 and semiconductor cooler 8 continue to run until the equipment cools to room temperature, at which point they automatically shut down. This ensures efficient heating while achieving equipment safety protection and energy conservation. The main technical parameters of this equipment are: 1. Input power: 380V / 50 / 60Hz; 2. Input power: 5-60KVA; 3. Output frequency: 20-1250KHz; 4. Duty cycle: 100%; Cooling water: 0.15-0.30MPa, water temperature ≤50℃.

[0051] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0052] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0053] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-contact induction heating device for steam turbine bolts, characterized in that, It includes a heating body (1), an induction heating component, a water-cooling component, and a control component; The heating body (1) is provided with a display screen (2), a button (3), a knob (4), a handle (6) and a heating output tube (9). The handle (6) is rotatably connected to the heating body (1) through a rotating column (5). The induction heating assembly includes an induction coil (10) disposed inside the heating output tube (9), and the induction coil (10) is used for non-contact induction heating of the turbine bolts; The water-cooled cooling assembly includes a water-cooled box (7), a thermoelectric cooler (8), a thermoelectric cooler chip (14), a circulating pump (12), a water-cooled pipe (11), a conduit (13), and a circulating pipe (15). The thermoelectric cooler chip (14) is disposed inside the water-cooled box (7). The thermoelectric cooler (8) is electrically connected to the thermoelectric cooler chip (14). The circulating pump (12) is disposed inside the water-cooled box (7) and is connected to the water-cooled pipe (11) through the conduit (13). The water-cooled pipe (11) is wound around the inner wall of the heating output pipe (9). The circulating pipe (15) connects the water-cooled pipe (11) and the water-cooled box (7) to form a cooling circulation loop. The control components are electrically connected to the display screen (2), button (3), knob (4), induction coil (10), semiconductor cooler (8) and circulation pump (12) respectively, and are used to control heating temperature, cooling efficiency and equipment operating status.

2. The non-contact induction heating device for turbine bolts according to claim 1, characterized in that, The induction coil (10) is wound evenly along the axial direction of the heating output tube (9), and the water cooling tube (11) and the induction coil (10) are arranged alternately on the inner wall of the heating output tube (9).

3. The non-contact induction heating device for turbine bolts according to claim 1, characterized in that, There are multiple semiconductor cooling chips (14), which are evenly distributed at the bottom of the water-cooled box (7). The semiconductor cooler (8) is located on the outside of the water-cooled box (7) and is connected to the semiconductor cooling chips (14).

4. The non-contact induction heating device for turbine bolts according to claim 1, characterized in that, The handle (6) can be folded and stored in the side wall of the heating body (1) via a rotating column (5), and the rotating column (5) is hinged to the heating body (1).

5. The non-contact induction heating device for turbine bolts according to claim 1, characterized in that, The control components include a temperature control module, a cooling control module and a display module. The temperature control module adjusts the heating power of the induction coil (10) through a knob (4) and a button (3). The cooling control module controls the start and stop of the semiconductor cooler (8) and the circulating pump (12). The display module displays the heating temperature, cooling water temperature and equipment operating parameters in real time through a display screen (2).

6. The non-contact induction heating device for turbine bolts according to claim 1, characterized in that, The heating output tube (9) is a high-temperature resistant insulating tube, and a heat insulation layer is provided between the induction coil (10) and the inner wall of the heating output tube (9).

7. The non-contact induction heating device for turbine bolts according to claim 1, characterized in that, The circulating pump (12) delivers the cooling medium in the water-cooled box (7) to the water-cooled pipe (11) through the conduit (13), and the cooling medium flows back to the water-cooled box (7) through the circulating pipe (15), thereby realizing the circulating cooling of the heating output pipe (9) and the induction coil (10).

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