CN202652581U - Eddy current antifreeze system for open pipes - Google Patents

Abstract

The utility model discloses an open-air pipe current vortex anti-icing system as an important device with huge market prospect which can prevent the pipe from being damaged by over low temperature in an open-air pipe network and ensure safety operation of the pipe network. The open-air pipe current vortex anti-icing system is a device for providing electric power to a resonant circuit by a large power supply, and heating a conductive magnetic pipe wall by alternating magnetic field generated by the resonant circuit, so as to prevent a flowing medium in the pipe from being iced. The open-air pipe current vortex anti-icing system mainly comprises: a direct-current power supply (1); an on-off control switch (2); the resonant circuit (3); a power thyristor (4); an induction heating coil (5); the conductive magnetic pipe wall (6); a waterproof insulation layer (7); and a liquid temperature sensing circuit (8). The heat power is provided for the normal operation of various outdoor pipes, and the open-air pipe current vortex anti-icing system has other features of low cost and maintenance cost, simple operation, safety, reliability, intelligence, and controllability.

Description

Eddy current antifreeze system for open pipes

technical field

The invention relates to an eddy current antifreeze system for open-air pipelines, which belongs to the important equipment in the open-air pipeline network to prevent damage to the pipeline caused by too low temperature and ensure the safe operation of the pipeline network. It has the advantages of low cost and maintenance costs, simple operation, safety, reliability and intelligence Controllable and other advantages, and has a huge market prospect. In particular, it relates to a low-cost, low-maintenance, easy-to-control, intelligent and flexible continuous resonant eddy current heating system. the

Background technique

For the urban pipeline network in the open environment, especially in the northern region, the temperature drops in autumn and winter, and sometimes the flow rate of the medium in the pipeline is zero. Therefore, in order to ensure the normal operation of each pipeline network in winter, it is required that various pipelines are not frozen and ready for use at any time . At present, the commonly used antifreeze methods include tap water temperature adiabatic antifreeze method, heating system supply and return water adiabatic antifreeze method, filling antifreeze liquid antifreeze method, adiabatic electric heating device heating antifreeze method and mixed antifreeze method. These methods all have large investment, The later maintenance cost is high and the operation is inconvenient. Therefore, it is one of the important issues in this field to find a scheme with small investment, quick effect and low maintenance cost. the

The invention mainly aims at the disadvantages of large investment, high maintenance cost and inconvenient operation of the antifreeze equipment of the open-air pipe network, and provides a repeatable, continuous and controllable electromagnetic oscillation circuit, which has sustainable work, flexible operation and light structure. features. the

Contents of the invention

The technical problem to be solved by the present invention is to prevent the damage to the pipeline caused by too low temperature in the open-air pipeline network. The high-efficiency and high-power resonant circuit is used to heat the wall of the magnetic pipe to ensure that the flowing medium in the pipe is not frozen, so as to provide outdoor The normal operation of the pipe network provides an effective solution. the

The technical solution adopted in the present invention is: the eddy current antifreeze system for open-air pipelines, including a DC power supply that supplies power to the resonant circuit (3) through the on-off control switch (2), and the power thyristor (4) amplifies the energy and heats it through induction The coil (5) raises the temperature of the magnetic pipe wall (6), wherein the magnetic pipe wall (6) is equipped with a waterproof insulation layer (7) to play the role of heat preservation and moisture resistance. When the temperature of the liquid in the pipe reaches the requirement, the liquid The temperature sensing detection circuit (8) cuts off the on-off control switch (2) so as to disconnect the circuit. the

The DC power supply (1) is realized by a high-power DC mobile power supply or a battery pack capable of providing high current, and at the same time, it is necessary to ensure that the power supply has a certain waterproof and moisture-proof effect. the

The on-off control switch is controlled and switched by the power controller (5) through power relays of different gears, so as to implement corresponding actions for different commands. the

The resonant circuit (3) is constructed by a novel single-channel Coppie sub-resonant circuit, two symmetrical inductance coils, resistors, N-channel enhanced power thyristors (4) and fast recovery diodes reversely connected to each other, which can realize arbitrary oscillation Frequency sine wave output. the

The induction heating coil (5) is composed of densely wound high-Q copper wires, and the outer layer of the wires must be coated with a waterproof layer, and the relevant test of the waterproof depth limit must be carried out. The number of tightly wound turns needs to be determined according to the specific working conditions of the circuit. Moreover, the induction heating coil (5) is embedded in the waterproof insulation layer (7), so it is not easy to be damaged. the

The magnetic tube wall (6) is a cylindrical high-permeable body on which the induction heating coil (5) is closely wound. If the pipe network itself is made of iron material, the wall of the pipe network can be used as the wall of the magnetic pipe, which can greatly reduce the investment and achieve good results. the

The liquid temperature sensing detection circuit (8) is composed of a high-precision temperature sensor suitable for working in a flowing medium, an A/D conversion circuit and a single-chip microcomputer, the temperature in the liquid is converted into a voltage signal by the sensor, and the A/D conversion The circuit samples and transmits the result to the single-chip microcomputer, and finally the single-chip microcomputer outputs a tripping or closing signal. the

The eddy current antifreeze system for open-air pipelines of the present invention generates an alternating magnetic field through a resonant circuit to act on the wall of the magnetic pipe, and the induced eddy current flows on the pipe wall to generate heat, thereby preventing the liquid medium flowing in the outdoor pipe network from freezing, and Real-time monitoring of operating conditions and issuing commands through single-chip microcomputers, sensors and actuators. This device provides an effective solution for the normal operation of open-air pipelines to prevent the medium from freezing and causing damage to the pipeline network. It has the advantages of simple operation, safety, reliability and intelligent controllability. the

Description of drawings

Fig. 1 is an overall structural block diagram of the present invention;

Figure 2 is an alternating magnetic field high-power oscillation generating circuit;

Fig. 3 is the geometric front view of the magnetic tube wall and the induction heating coil;

Figure 4 is a side view of the eddy current antifreeze system for open-air pipelines;

Figure 5 is the liquid sensor intelligent control circuit. the

in:

1: DC power supply; 2: On-off control switch; 3: Resonant circuit; 4: Power thyristor; 5: Induction heating coil; 6: Magnetic tube wall; 7: Waterproof insulation layer; 8: Liquid sensing circuit. the

R1: Q1 clamping resistor R1: Q2 clamping resistor

L1: Q1 inductance L2: Q2 inductance

Q1: Power Thyristor 1 Q2: Power Thyristor 2

D1: Fast Reply Diode 1 D2: Fast Reply Diode 2

C: Oscillation matching capacitor

Detailed ways

The eddy current antifreeze system for open pipes of the present invention will be described in detail below in conjunction with examples and accompanying drawings. the

As shown in Figure 1, the open-pipe eddy current antifreeze system of the present invention includes DC power supply (1); On-off control switch (2); Resonant circuit (3); Power thyristor (4); Induction heating coil (5) ; magnetic tube wall (6); waterproof insulation layer (7); liquid temperature sensing detection circuit (8). The invention uses a high-power DC power supply to generate an alternating magnetic field to act on the wall of the magnetic pipe, and induces eddy currents to heat the liquid medium in the pipe, thereby preventing low-temperature freezing. the

As shown in Fig. 2, the resonant circuit (3) is composed of two symmetrical inductance coils, resistors, N-channel enhanced power thyristors (4) and fast recovery diodes reversely connected to each other. After the on-off control switch (2) is closed, two symmetrical circuits feed power to the base of the power thyristor (4) at the same time. The circuit where it is located is alternately turned on, so that AB outputs the full waveform of the sine wave. the

As shown in Fig. 3, described induction heating coil (5) is the closely wound copper coil, and this coil is fixed on the side wall of becoming cylindrical magnetic conduction tube wall (6) after coating waterproof layer, Put waterproof insulation layer (7) on the outside. The magnetic tube wall (6) plays the role of inducing eddy current and generating heat, and also plays a supporting role. If the pipe network itself is made of iron material, the wall of the pipe network can be used as the wall of the magnetic pipe, which can greatly reduce the investment and achieve good results. the

As shown in Fig. 4, after the induction heating coil (5) is installed on the magnetic pipe wall (6), the liquid medium in the pipe flows along the pipe, so as to play a heating role and not affect the normal operation of the pipe. the

As shown in Figure 5, the liquid temperature sensing detection circuit (8) is composed of a high-precision temperature sensor suitable for liquid medium operations, an A/D conversion circuit and a single-chip microcomputer. First set the start and end temperature of the microcontroller, if not specified, the default start temperature is zero degrees, and the end temperature is 15 degrees. When the temperature is lower than the starting temperature, the single-chip microcomputer issues an instruction to close the on-off control switch (2), and the resonant circuit (3) starts to work, and the alternating electromagnetic field produced induces eddy current pairs on the eddy current heating magnetic tube wall (6). The surrounding water body is heated; when the temperature is equal to the end temperature, the single-chip microcomputer issues an instruction to open the on-off control switch (2), and the resonant circuit (3) stops working. the

In the eddy current antifreeze system for open-air pipelines of the present invention, when the temperature is lower than the starting temperature, the on-off control switch (2) is closed, the resonant circuit (3) starts to work, and the magnetic tube wall (6) heats the surrounding liquid medium; When the temperature is equal to the end temperature, the single-chip microcomputer sends an instruction to open the on-off control switch (2), and the resonant circuit (3) stops working. This device provides an effective solution to prevent the freezing of the outdoor pipe network for the normal operation of the outdoor pipe network under low temperature conditions. It has the advantages of simple and flexible control, low cost and does not affect the normal operation. the

Claims (5)

1. The eddy current antifreeze system for open-air pipelines is characterized in that it includes a DC power supply that supplies power to the resonant circuit (3) through the on-off control switch (2), and the power thyristor (4) amplifies the energy and heats the coil (5) through induction The temperature of the magnetic tube wall (6) is increased, and the external wall of the magnetic tube (6) is equipped with a waterproof insulation layer (7) to play the role of heat preservation and moisture resistance. When the temperature of the liquid in the pipeline reaches the requirement, the liquid temperature sensor detects The circuit (8) cuts off the on-off control switch (2) so that the circuit is disconnected. 2. The open-pipe eddy current antifreeze system according to claim 1 is characterized in that the resonant circuit (3) is built by a novel single-way Copier resonant circuit, two-way symmetrical inductance coils, resistance, N ditch The channel enhanced power thyristor (4) and fast recovery diodes reversely connected to each other can realize sine wave output with any oscillation frequency. 3. The eddy current antifreeze system for open-air pipelines according to claim 1, further characterized in that the induction heating coil (5) is made of densely wound high-Q copper wires, and the outer layer of the wires must be coated with a waterproof layer And carry out the relevant test of the waterproof depth limit; the number of tightly wound turns needs to be determined according to the specific working conditions of the circuit; and the induction heating coil (5) is embedded in the waterproof insulation layer (7), so that it is not easy to be damaged. 4. The eddy current antifreeze system for open-pipelines according to claim 1, further characterized in that the magnetic pipe wall (6) is a cylindrical high-conductive body on which the induction heating coil (5) is closely wound ; If the pipe network itself is made of iron material, the wall of the pipe network can be used as the wall of the magnetic pipe, which can greatly reduce the investment and achieve good results. 5. The eddy current antifreeze system for open-pipelines according to claim 1, further characterized in that the liquid temperature sensing detection circuit (8) consists of a high-precision temperature sensor suitable for working in a flowing medium, an A/D conversion Composed of circuit and single-chip microcomputer, the sensor converts the temperature in the liquid into a voltage signal, samples through the A/D conversion circuit, and transmits the result to the single-chip microcomputer, and finally the single-chip microcomputer outputs a tripping or closing signal. the

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