A high-frequency induction heating power supply for pipeline anticorrosion coating peeling

Abstract

The utility model discloses a high frequency induction heating power supply for pipeline anticorrosive layer peeling, including three -phase rectifier bridge, first power module, second power module, first controller and second controller, and first power module and second power module are connected in parallel on the output of three -phase rectifier bridge, and the output of first power module is connected with first induction heating coil, and the output of second power module is connected with second induction heating coil, two controllers pass through respective driver control respective power module output high frequency alternating -current, first controller and second controller communication connection, the utility model discloses to adopt the upper passageway structure, and each group power module can connect induction heating coil and work simultaneously, has improved pipeline anticorrosive layer peeling efficiency, and two groups of power module can control output frequency through respective controller, and simultaneously, through the connection of two controllers, also can form master -slave control, makes the frequency synchronization of two power module output.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipeline anti-corrosion coating peeling equipment, specifically a high-frequency induction heating power supply for peeling pipeline anti-corrosion coating. Background Technology

[0002] During pipeline construction, maintenance, and emergency repair, it is necessary to remove the 3PE and other anti-corrosion layers from the outer wall of the pipeline. The two most common methods for removing anti-corrosion layers are mechanical removal and thermal removal.

[0003] Mechanical stripping refers to removing the anti-corrosion layer from the outer wall of a pipe by grinding or cutting, which is inefficient. Therefore, thermal stripping is currently the main method used. Thermal stripping involves connecting high-frequency alternating current to an electromagnetic induction coil, creating eddy currents within the pipe body to achieve heating. Due to the significant skin effect of the high-frequency induced current, the heat is concentrated on the contact surface between the metal pipe and the anti-corrosion layer, resulting in higher efficiency.

[0004] For example, Chinese utility model patent application CN108723015A discloses a novel device for peeling off the anti-corrosion layer on the outer wall of pipelines. It mainly consists of fiberglass cloth, an electromagnetic induction coil, a soft magnetic plate, a temperature measuring device, a temperature controller, a frequency converter, the pipeline body, and the anti-corrosion layer. The power frequency electricity is output as 20-40kHz high-frequency AC current through the frequency converter to the electromagnetic induction coil, forming eddy currents within the pipeline body to achieve heating. The fiberglass cloth provides heat insulation and thermal insulation, while the soft magnetic plate shields the external magnetic field and enhances the internal magnetic field. The temperature measuring device and temperature controller control the output of the frequency converter according to the temperature required for softening the anti-corrosion layer. It features a reasonable structure, controllable temperature unaffected by external environmental factors, high thermal efficiency, and safe and reliable operation.

[0005] However, the induction heating power supplies currently used for stripping anti-corrosion layers are usually single-channel structures, meaning that one power supply can only connect to one induction heating coil. During construction, such as when welding pipes, it is necessary to strip the anti-corrosion layers from both ends of the pipe on both sides of the welding surface. If a single-channel induction heating device is used, the efficiency will be low. If two induction heating devices are used, it will lead to problems such as difficulty in synchronizing the two devices and increased equipment costs. Utility Model Content

[0006] This invention proposes a high-frequency induction heating power supply for peeling off anti-corrosion coatings from pipelines, aiming to solve the problem of low efficiency of existing single-channel high-frequency induction heating power supplies for peeling off anti-corrosion coatings from pipelines.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A high-frequency induction heating power supply for peeling off anti-corrosion coatings of pipelines includes a three-phase rectifier bridge, a first power module, a second power module, a first controller, and a second controller. The input terminal of the three-phase rectifier bridge is connected to an AC380V three-phase power supply. The first power module and the second power module are connected in parallel to the output terminal of the three-phase rectifier bridge. The output terminal of the first power module is connected to a first induction heating coil, and the output terminal of the second power module is connected to a second induction heating coil. The first controller controls the first power module to output a high-frequency alternating current to the first induction heating coil via a first driver; the second controller controls the second power module to output a high-frequency alternating current to the second induction heating coil via a second driver. The first controller is communicatively connected to the second controller.

[0008] Preferably, the first power module includes a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, and a fourth IGBT module Q4. The emitter of the first IGBT module Q1 is connected to the collector of the third IGBT module Q3, the emitter of the second IGBT module Q2 is connected to the collector of the fourth IGBT module Q4, the collectors of the first IGBT module Q1 and the second IGBT module Q2 are connected to the positive terminal of the three-phase rectifier bridge 1, and the emitters of the third IGBT module Q3 and the fourth IGBT module Q4 are connected to the negative terminal of the three-phase rectifier bridge output. The first induction heating coil is connected to the emitter of the first IGBT module Q1 and the collector of the third IGBT module Q3. The other terminal of the first induction heating coil is connected to the emitter of the second IGBT module Q2 and the collector of the fourth IGBT module Q4. The output terminal of the first driver is connected to the gate of the first to fourth IGBT modules Q1-Q4 respectively. The first controller controls the first IGBT module Q1, the fourth IGBT module Q4 and the second IGBT module Q2 and the third IGBT module Q3 to turn on and off alternately through the first driver. The second power module includes a fifth IGBT module Q5, a sixth IGBT module Q6, a seventh IGBT module Q7, and an eighth IGBT module Q8. The connection method of the four IGBT modules Q5-Q8 in the second power module is the same as that in the first power module. The output terminal of the second driver is connected to the gate of the fifth to eighth IGBT modules Q5-Q8 respectively. The second controller controls the fifth IGBT module Q5, the eighth IGBT module Q8, the sixth IGBT module Q6, and the seventh IGBT module Q7 to turn on and off alternately through the second driver.

[0009] Preferably, both the first controller and the second controller are DSP controllers, and the first controller and the second controller are connected via an SPI interface.

[0010] Preferably, both the first driver and the second driver are optocoupler-isolated full-bridge drivers.

[0011] Preferably, the output of the three-phase rectifier bridge is connected in parallel with a smoothing capacitor C1.

[0012] Preferably, a first filter capacitor C2 and a second filter capacitor C3 are connected in series at the output terminal of the first power module, and a third filter capacitor C4 and a fourth filter capacitor C5 are connected in series at the output terminal of the second power module.

[0013] Preferably, the output terminal of the first power module 2 is provided with a first current sampling device, and the signal output terminal of the first current sampling device is connected to the input terminal of the first controller 7; the output terminal of the second power module is provided with a second current sampling device 9, and the signal output terminal of the second current sampling device 9 is connected to the input terminal of the second controller 8.

[0014] Beneficial effects Compared with the prior art, the present invention can achieve at least the following technical effects: 1. This utility model adopts an upper channel structure, with two sets of power modules connected in parallel at the output end of the rectifier bridge. Each set of power modules can be connected to an induction heating coil and work simultaneously, which improves the peeling efficiency of the anti-corrosion layer of the pipeline.

[0015] 2. The two power modules of this invention can control their output frequency through their respective controllers. Furthermore, by connecting the two controllers, a master-slave control system can be established, synchronizing the output frequencies of the two power modules. This provides greater flexibility and applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit structure of this utility model.

[0017] In the diagram: 1. Three-phase rectifier bridge; 2. First power module; 3. Second power module; 4. First driver; 5. Second driver; 6. First current sampling device; 7. First controller; 8. Second controller; 9. Second current sampling device; 10. First induction heating coil; 11. Second induction heating coil. Detailed Implementation

[0018] The present invention will be further explained below with reference to specific implementation examples.

[0019] Please see Figure 1This utility model proposes a high-frequency induction heating power supply for peeling off the anti-corrosion layer of pipelines, including a three-phase rectifier bridge 1, a first power module 2, a second power module 3, a first controller 7, and a second controller 8. The input terminal of the three-phase rectifier bridge 1 is connected to an AC380V three-phase power supply. The first power module 2 and the second power module 3 are connected in parallel to the output terminal of the three-phase rectifier bridge 1. The output terminal of the first power module 2 is connected to a first induction heating coil 10, and the output terminal of the second power module 3 is connected to a second induction heating coil 11. The first controller 7 controls the first power module 2 to output a high-frequency alternating current to the first induction heating coil 10 via the first driver 4; the second controller 8 controls the second power module 3 to output a high-frequency alternating current to the second induction heating coil 11 via the second driver 5. The first controller 7 is communicatively connected to the second controller 8.

[0020] The three-phase rectifier bridge 1 uses six bridged diodes to rectify the 50Hz three-phase AC power into DC power. The first controller 7 and the second controller 8 send PWM signals to the two power modules through the first driver 4 and the second driver 5, respectively. The two power modules adjust their switching frequency according to the PWM signals to output high-frequency AC power of 20KHz~40KHz. The first induction heating coil 10 and the second induction heating coil 11 are fixed to the surface of the anti-corrosion layer of the pipe, and heating is achieved by forming eddy currents in the pipe body. Due to the significant skin effect of the high-frequency induced current, the heat is concentrated on the contact surface between the metal pipe and the anti-corrosion layer, causing the anti-corrosion layer to melt and separate from the metal outer wall of the pipe.

[0021] In one mode of this embodiment, the two controllers can individually control the corresponding power modules to output AC current of a corresponding frequency according to their respective input commands; In another mode of this embodiment, the first controller 7 can also transmit control commands to the second controller 8 via the SPI interface, thereby enabling the two power modules to output the same frequency. Operators can select the control mode of the power supply device according to actual construction needs.

[0022] In this embodiment, the first power module 2 is further configured such that it includes a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, and a fourth IGBT module Q4. The emitter of the first IGBT module Q1 is connected to the collector of the third IGBT module Q3, the emitter of the second IGBT module Q2 is connected to the collector of the fourth IGBT module Q4, the collectors of the first IGBT module Q1 and the second IGBT module Q2 are connected to the positive terminal of the three-phase rectifier bridge 1, and the emitters of the third IGBT module Q3 and the fourth IGBT module Q4 are connected to the negative terminal of the output of the three-phase rectifier bridge 1. Connection; one terminal of the first induction heating coil 10 is connected between the emitter of the first IGBT module Q1 and the collector of the third IGBT module Q3, and the other terminal of the first induction heating coil 10 is connected between the emitter of the second IGBT module Q2 and the collector of the fourth IGBT module Q4. The output terminal of the first driver 4 is connected to the gates of the first to fourth IGBT modules Q1-Q4 respectively. The first controller 7 controls the first IGBT module Q1, the fourth IGBT module Q4 and the second IGBT module Q2, the third IGBT module Q3 to turn on and off alternately through the first driver 4. The second power module 3 includes a fifth IGBT module Q5, a sixth IGBT module Q6, a seventh IGBT module Q7, and an eighth IGBT module Q8. The connection method of the four IGBT modules Q5-Q8 in the second power module 3 is the same as that in the first power module 2. The output terminal of the second driver 5 is connected to the gate of the fifth to eighth IGBT modules Q5-Q8 respectively. The second controller 8 controls the fifth IGBT module Q5, the eighth IGBT module Q8, the sixth IGBT module Q6, and the seventh IGBT module Q7 to turn on and off alternately through the second driver 5.

[0023] In the first power module 2, the first IGBT module Q1 and the fourth IGBT module Q4 form a module group, and the second IGBT module Q2 and the third IGBT module Q3 form a module group. The first controller 7 controls the two module groups to alternately switch on and off through the first driver 4, so that the output of the first power module 2 is a high-frequency AC voltage.

[0024] The structure and working principle of the second power module 3 are the same as those of the first power module 2, and will not be described again here.

[0025] In this embodiment, both the first controller 7 and the second controller 8 are DSP controllers, and the first controller 7 and the second controller 8 are connected via an SPI interface.

[0026] Among them, the first controller 7 and the second controller 8 are selected as DSP controllers, such as the ADSP-CM40x series or the dsPIC33 series. The DSP controller executes control algorithms such as PID and fuzzy control internally according to the external input instructions and calculates the optimal PWM signal.

[0027] The two DSP controllers communicate via an SPI interface to achieve master-slave control.

[0028] In this embodiment, the first driver 4 and the second driver 5 are both optocoupled and isolated full-bridge drivers.

[0029] Both drivers are full-bridge drivers with four drive channels to control four IGBT modules in a power module. Optical isolation is used between the driver inputs and outputs, resulting in high common-mode rejection ratio.

[0030] In this embodiment, the output of the three-phase rectifier bridge 1 is further configured to be connected in parallel with a smoothing capacitor C1.

[0031] By setting the smoothing capacitor C1, the pulse component in the output of the three-phase rectifier bridge 1 can be filtered out, so that the output of the three-phase rectifier bridge 1 is a smooth DC voltage.

[0032] In this embodiment, the output terminal of the first power module 2 is connected in series with a first filter capacitor C2 and a second filter capacitor C3, and the output terminal of the second power module 3 is connected in series with a third filter capacitor C4 and a fourth filter capacitor C5.

[0033] By setting four filter capacitors C2, C3, C4 and C5 on the output leads of the two power modules, low-frequency or DC components in the output of the two power modules can be filtered out, thereby improving the efficiency of induction heating.

[0034] In this embodiment, the output terminal of the first power module 2 is provided with a first current sampling device 6, and the signal output terminal of the first current sampling device 6 is connected to the input terminal of the first controller 7; the output terminal of the second power module 3 is provided with a second current sampling device 9, and the signal output terminal of the second current sampling device 9 is connected to the input terminal of the second controller 8.

[0035] The outputs of the two power modules are sampled by the first current sampling device 6 and the second current sampling device 9, and fed back to the first controller 7 and the second controller 8. The first controller 7 and the second controller 8 adjust the PWM signal output according to the feedback sampling signal to make the output frequency of the power supply more stable. The current sampling device can be a current transformer or a Hall current probe.

[0036] In summary, this embodiment adopts a dual-channel setup, which can simultaneously power two induction heating coils, improving construction efficiency. The two induction heating coils can operate at the same frequency or at different frequencies, allowing workers to flexibly control the frequency of the two induction heating coils according to construction needs.

[0037] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high frequency induction heating power supply for pipeline coating disbondment, characterized by, It includes a three-phase rectifier bridge (1), a first power module (2), a second power module (3), a first controller (7), and a second controller (8). The input terminal of the three-phase rectifier bridge (1) is connected to an AC380V three-phase power supply. The first power module (2) and the second power module (3) are connected in parallel to the output terminal of the three-phase rectifier bridge (1). The output terminal of the first power module (2) is connected to a first induction heating coil (10), and the output terminal of the second power module (3) is connected to a second induction heating coil (11). The first controller (7) controls the first power module (2) to output high-frequency AC current to the first induction heating coil (10) through the first driver (4); the second controller (8) controls the second power module (3) to output high-frequency AC current to the second induction heating coil (11) through the second driver (5); The first controller (7) is communicatively connected to the second controller (8).

2. The high-frequency induction heating power supply for peeling off the anti-corrosion coating of pipelines according to claim 1, characterized in that, The first power module (2) includes a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, and a fourth IGBT module Q4. The emitter of the first IGBT module Q1 is connected to the collector of the third IGBT module Q3, the emitter of the second IGBT module Q2 is connected to the collector of the fourth IGBT module Q4, the collectors of the first IGBT module Q1 and the second IGBT module Q2 are connected to the positive terminal of the three-phase rectifier bridge (1), and the emitters of the third IGBT module Q3 and the fourth IGBT module Q4 are connected to the negative terminal of the output of the three-phase rectifier bridge (1). The first inductively coupled... One terminal of the heating coil (10) is connected between the emitter of the first IGBT module Q1 and the collector of the third IGBT module Q3. The other terminal of the first induction heating coil (10) is connected between the emitter of the second IGBT module Q2 and the collector of the fourth IGBT module Q4. The output terminal of the first driver (4) is connected to the gates of the first to fourth IGBT modules Q1-Q4 respectively. The first controller (7) controls the first IGBT module Q1, the fourth IGBT module Q4 and the second IGBT module Q2 and the third IGBT module Q3 to turn on and off alternately through the first driver (4). The second power module (3) includes a fifth IGBT module Q5, a sixth IGBT module Q6, a seventh IGBT module Q7 and an eighth IGBT module Q8. The connection method of the four IGBT modules Q5-Q8 of the second power module (3) is the same as that of the first power module (2). The output terminal of the second driver (5) is connected to the gate of the fifth to eighth IGBT modules Q5-Q8 respectively. The second controller (8) controls the fifth IGBT module Q5, the eighth IGBT module Q8 and the sixth IGBT module Q6 and the seventh IGBT module Q7 to turn on and off in turn through the second driver (5).

3. The high-frequency induction heating power supply for peeling off the anti-corrosion coating of pipelines according to claim 1, characterized in that, Both the first controller (7) and the second controller (8) are DSP controllers, and the first controller (7) and the second controller (8) are connected via an SPI interface.

4. A high-frequency induction heating power supply for peeling off anti-corrosion coatings on pipelines according to claim 1, characterized in that, Both the first driver (4) and the second driver (5) are optocoupler-isolated full-bridge drivers.

5. A high-frequency induction heating power supply for peeling off anti-corrosion coatings on pipelines according to claim 1, characterized in that, The output of the three-phase rectifier bridge (1) is connected in parallel with a smoothing capacitor C1.

6. A high-frequency induction heating power supply for peeling off anti-corrosion coatings on pipelines according to claim 1, characterized in that, The first power module (2) has a first filter capacitor C2 and a second filter capacitor C3 connected in series at its output terminal, and the second power module (3) has a third filter capacitor C4 and a fourth filter capacitor C5 connected in series at its output terminal.

7. A high-frequency induction heating power supply for peeling off anti-corrosion coatings on pipelines according to claim 1, characterized in that, The output terminal of the first power module (2) is provided with a first current sampling device (6), and the signal output terminal of the first current sampling device (6) is connected to the input terminal of the first controller (7); the output terminal of the second power module (3) is provided with a second current sampling device (9), and the signal output terminal of the second current sampling device (9) is connected to the input terminal of the second controller (8).

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