A demagnetization and heating integrated device

Abstract

The present invention discloses a demagnetization and heating integrated device, including a three-phase rectifier bridge module, a high-frequency filter capacitor, a DC filter support module, a buffer absorption protection module, a controller, an IGBT power module and a coil; the input end of the three-phase rectifier bridge module is connected to a three-phase 380vAC power supply, the output end of the three-phase rectifier bridge module is connected to the controller and the high-frequency filter capacitor, the DC filter support module is connected to the high-frequency filter capacitor, the buffer absorption protection module is connected to the DC filter support module, the buffer absorption protection module and the controller are both connected to the IGBT power module, and the controller controls the IGBT power module to generate AC demagnetization, induction heating and DC demagnetization functions. The present invention can realize the three functions of AC demagnetization, induction heating and DC demagnetization through one circuit, and realize multiple functions of one device, without the need for AC demagnetization, induction heating and DC demagnetization to be realized by using independent circuit structures respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline construction, and more specifically, to a demagnetization and heating integrated device. Background Art

[0002] In the existing technology, the following problems exist in pipeline demagnetization and pipe mouth heating during hot work and emergency operations: when welding, the pipe mouth needs to be heated and demagnetized at the same time. If demagnetization and heating are to be performed, the demagnetization coil and the heating coil must be distributed within 10 cm from the pipe mouth. The existing pipeline demagnetization machine and medium frequency heating both require cable winding, but the cable of the pipeline demagnetization machine is close to the pipe mouth, and the medium frequency heating cable is far from the pipe mouth, so that the pipe mouth demagnetization and heating cannot be performed at the same time during on-site pipe replacement operations. The disadvantages are: pipe mouth demagnetization and heating are two different equipment. On-site operations generally require two sets of heating equipment and demagnetization equipment. The equipment is large in size and inconvenient to move. For this reason, it is indeed necessary to provide an integrated demagnetization and heating device. Summary of the invention

[0003] The purpose of the present invention is to provide a demagnetization and heating integrated device to overcome the defects of the prior art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A demagnetization and heating integrated device comprises a three-phase rectifier bridge module, a high-frequency filter capacitor, a DC filter support module, a buffer absorption protection module, a controller, an IGBT power module and a coil; the input end of the three-phase rectifier bridge module is connected to a three-phase 380vAC power supply, the output end of the three-phase rectifier bridge module is connected to the controller and the high-frequency filter capacitor, the DC filter support module is connected to the high-frequency filter capacitor, the buffer absorption protection module is connected to the DC filter support module, the buffer absorption protection module and the controller are both connected to the IGBT power module, and the controller controls the IGBT power module to generate AC demagnetization, induction heating and DC demagnetization functions.

[0006] Further, the IGBT power module includes first to fourth IGBT modules Q1-Q4, the first IGBT module and the fourth IGBT module constitute a first module, the second IGBT module and the third IGBT module constitute a second module, the emitter of the first IGBT module is connected to the collector of the third IGBT module, the emitter of the second IGBT module is connected to the collector of the fourth IGBT module, the collector of the first IGBT module and the collector of the second IGBT module are connected to one side of the output end of the buffer absorption protection module, the emitter of the third IGBT module and the emitter of the fourth IGBT module are connected to the other side of the output end of the buffer absorption protection module, the gate and emitter of the first to fourth IGBT modules are connected to the controller, one end of the coil is connected between the emitter of the first IGBT module and the collector of the third IGBT module, and the other end of the coil is connected between the emitter of the second IGBT module and the collector of the fourth IGBT module;

[0007] During induction heating, the controller controls the first module and the second module to conduct alternately through the generated square wave signal to generate a positive half-wave current waveform and a negative half-wave current waveform, so as to perform medium frequency heating through the coil;

[0008] During AC demagnetization, the controller drives the first IGBT module Q1 and the fourth IGBT module Q4 to conduct and output a single pulse wave to generate an AC demagnetization magnetic field;

[0009] When DC demagnetization and induction heating are integrated, the three-phase power supply is input to the three-phase rectifier bridge module, and the output DC current is added to the IGBT power module after passing through the high-frequency filter capacitor and the DC filter support module. The high pulse current is filtered by the buffer absorption protection module. At the same time as induction heating, the square wave signal generated by the controller controls the first module and the second module to be turned on alternately to generate a reverse magnetic field for offsetting the residual magnetic field in the pipeline.

[0010] Furthermore, an input current acquisition module is also provided at the output end of the three-phase rectifier bridge module, and the input current acquisition module is connected to the controller.

[0011] Furthermore, the DC filtering support module includes a capacitor C2, a capacitor C3 and a capacitor C4 which are arranged in parallel.

[0012] Furthermore, the buffer absorption protection module includes a capacitor C5 and a capacitor C6 which are arranged in parallel.

[0013] Furthermore, the output end of the IGBT power module is also connected to an output current acquisition module, and the output current acquisition module is connected to the controller.

[0014] Furthermore, the controller is also connected to a Hall probe, and the Hall probe is used to identify the current direction of the first IGBT module Q1 and the fourth IGBT module Q4 when conducting and outputting a single pulse wave during AC demagnetization.

[0015] Compared with the prior art, the advantages of the present invention are: the present invention provides an integrated demagnetization and heating device, which can realize the three functions of AC demagnetization, induction heating and DC demagnetization through one circuit, thereby realizing multiple functions of one device, without the need for AC demagnetization, induction heating and DC demagnetization to be realized by independent circuit structures respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a circuit diagram of the demagnetization and heating integrated device of the present invention.

[0018] Figure 2 It is the induction heating waveform diagram of the present invention.

[0019] Figure 3 It is the AC demagnetization waveform diagram of the present invention.

[0020] Figure 4 It is the DC demagnetization and heating waveform diagram of the present invention. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0022] See also Figure 1 and Figure 2As shown, this embodiment discloses a demagnetization and heating integrated device, including a three-phase rectifier bridge module, a high-frequency filter capacitor C1, a DC filter support module, a buffer absorption protection module, a controller (a 32-bit single-chip microcomputer can be used), an IGBT power module and a coil; the input end of the three-phase rectifier bridge module is connected to a three-phase 380vAC power supply, the output end of the three-phase rectifier bridge module is connected to the controller and the high-frequency filter capacitor, the DC filter support module is connected to the high-frequency filter capacitor, the buffer absorption protection module is connected to the DC filter support module, the buffer absorption protection module and the controller are both connected to the IGBT power module, and the controller controls the IGBT power module to generate AC demagnetization, induction heating and DC demagnetization functions.

[0023] The IGBT power module includes first to fourth IGBT modules Q1-Q4, the first IGBT module and the fourth IGBT module constitute a first module, the second IGBT module and the third IGBT module constitute a second module, the emitter of the first IGBT module is connected to the collector of the third IGBT module, the emitter of the second IGBT module is connected to the collector of the fourth IGBT module, the collector of the first IGBT module and the collector of the second IGBT module are connected to one side of the output end of the buffer absorption protection module, the emitter of the third IGBT module and the emitter of the fourth IGBT module are connected to the other side of the output end of the buffer absorption protection module, the gate and emitter of the first to fourth IGBT modules are connected to the controller, one end of the coil is connected between the emitter of the first IGBT module and the collector of the third IGBT module, and the other end of the coil is connected between the emitter of the second IGBT module and the collector of the fourth IGBT module.

[0024] During induction heating, Figure 2 As shown, T1-T4 refers to the time length, three-phase 380vAC 50Hz power input, if the frequency is between 5 and 30KHz, the controller controls the heating, and controls the first module composed of the first IGBT module Q1 and the fourth IGBT module Q4 and the second module composed of the second IGBT module Q2 and the third IGBT module Q3 to be turned on in turn through the generated square wave signal, thereby outputting the positive half-wave current waveform and the negative half-wave current waveform in turn to perform medium frequency heating through the coil, and repeating this cycle to perform medium frequency heating on the pipeline.

[0025] During AC demagnetization, Figure 3As shown, a is a single pulse waveform of positive pulse width, and b is a single pulse waveform of negative pulse width. The three-phase 380vAC 50Hz power input flows to the controller through the three-phase rectifier bridge module. The controller drives the first IGBT module Q1 and the fourth IGBT module Q4 to conduct and output a single pulse wave. The controller is also connected to a Hall probe, which identifies the direction of the current. If the pulse width is between 10μs and 6ms, a peak current of more than 1000A in one direction is generated within a certain period of time, thereby generating an AC demagnetization magnetic field to reduce the magnetic field strength of the pipeline.

[0026] When DC demagnetization and induction heating are combined, Figure 4 As shown, a is the positive DC heating waveform, and b is the negative DC heating waveform. The three-phase 380vAC 50Hz power supply is input to the three-phase rectifier bridge, and after passing through the high-frequency filter capacitor C1 and the DC filter support module (DC filter support DC-LINK capacitor group) composed of capacitors C2, C3, and C4 in parallel, a 0-200A DC current is output and added to the IGBT power module. DC demagnetization and heating are carried out simultaneously, and the buffer absorption protection module (IGBT buffer absorption protection capacitor group) composed of capacitors C5 and C6 in parallel filters the high pulse current. While performing induction heating, the square wave signal generated by the controller controls the first module composed of the first IGBT module Q1 and the fourth IGBT module Q4 and the second module composed of the second IGBT module Q2 and the third IGBT module Q3 to turn on in turn, and then output two square waves in turn, and the positive and negative currents cancel each other out, generating a reverse magnetic field for offsetting the residual magnetic field in the pipeline.

[0027] In this embodiment, an input current acquisition module is further provided at the output end of the three-phase rectifier bridge module, and the input current acquisition module is connected to the controller for collecting the input current.

[0028] In this embodiment, the output end of the IGBT power module is further connected to an output current acquisition module, and the output current acquisition module is connected to the controller for collecting the output current.

[0029] The present invention can realize three functions of AC demagnetization, induction heating and DC demagnetization through one circuit, thereby realizing multiple functions of one device, without the need for AC demagnetization, induction heating and DC demagnetization to be realized by independent circuit structures respectively, and the circuit structure of the IGBT power module group is simpler.

[0030] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, the patent owner may make various variations or modifications within the scope of the appended claims. As long as they do not exceed the protection scope described in the claims of the present invention, they should be within the protection scope of the present invention.

Claims

1. A demagnetization and heating integrated device, characterized in that: It includes a three-phase rectifier bridge module, a high-frequency filter capacitor, a DC filter support module, a buffer absorption protection module, a controller, an IGBT power module and a coil; the input end of the three-phase rectifier bridge module is connected to a three-phase 380vAC power supply, the output end of the three-phase rectifier bridge module is connected to the controller and the high-frequency filter capacitor, the DC filter support module is connected to the high-frequency filter capacitor, the buffer absorption protection module is connected to the DC filter support module, the buffer absorption protection module and the controller are both connected to the IGBT power module, and the controller controls the IGBT power module to generate AC demagnetization, induction heating and DC demagnetization functions; The IGBT power module includes first to fourth IGBT modules Q1-Q4, the first IGBT module and the fourth IGBT module constitute a first module, the second IGBT module and the third IGBT module constitute a second module, the emitter of the first IGBT module is connected to the collector of the third IGBT module, the emitter of the second IGBT module is connected to the collector of the fourth IGBT module, the collector of the first IGBT module and the collector of the second IGBT module are connected to one side of the output end of the buffer absorption protection module, the emitter of the third IGBT module and the emitter of the fourth IGBT module are connected to the other side of the output end of the buffer absorption protection module, the gate and emitter of the first to fourth IGBT modules are connected to the controller, one end of the coil is connected between the emitter of the first IGBT module and the collector of the third IGBT module, and the other end of the coil is connected between the emitter of the second IGBT module and the collector of the fourth IGBT module; During induction heating, the controller controls the first module and the second module to conduct alternately through the generated square wave signal to generate a positive half-wave current waveform and a negative half-wave current waveform, so as to perform medium frequency heating through the coil; During AC demagnetization, the controller drives the first IGBT module Q1 and the fourth IGBT module Q4 to conduct and output a single pulse wave to generate an AC demagnetization magnetic field; When DC demagnetization and induction heating are integrated, the three-phase power supply is input to the three-phase rectifier bridge module, and the DC current is output after passing through the high-frequency filter capacitor and the DC filter support module and added to the IGBT power module. The high pulse current is filtered by the buffer absorption protection module. At the same time of induction heating, the square wave signal generated by the controller controls the first module and the second module to be turned on in turn to generate a reverse magnetic field for offsetting the residual magnetic field in the pipeline; The DC filter support module includes a capacitor C2, a capacitor C3 and a capacitor C4 arranged in parallel; The buffer absorption protection module includes a capacitor C5 and a capacitor C6 which are arranged in parallel.

2. The demagnetization and heating integrated equipment according to claim 1, characterized in that: An input current acquisition module is also provided at the output end of the three-phase rectifier bridge module, and the input current acquisition module is connected to the controller.

3. The demagnetization and heating integrated equipment according to claim 1, characterized in that: The output end of the IGBT power module is also connected to an output current acquisition module, and the output current acquisition module is connected to a controller.

4. The demagnetization and heating integrated equipment according to claim 1, characterized in that: The controller is also connected to a Hall probe, which is used to identify the current direction of the first IGBT module Q1 and the fourth IGBT module Q4 when conducting and outputting a single pulse wave during AC demagnetization.

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