KR102237402B1 - Power saving heater for preventing be frozen to burst - Google Patents

Abstract

An embodiment of the present invention can stably operate a system in spite of frequent control which is called output control of heating power by solving the problems of an existing step-by-step heating power control panel. To this end, the present invention provides a power saving type freezing and bursting prevention system, comprising: a fluid accommodating unit accommodating a fluid therein; a heating unit mounted on the fluid receiving unit; an external air temperature sensor disposed around the fluid accommodating unit to sense external air temperature; a control signal applying unit detecting the sensed external air temperature and applying a step-by-step output control signal for adjusting the output of heating power to be supplied to the heating unit in a step-by-step manner based on the detected external air temperature; and a heating power adjusting unit adjusting the output of the heating power based on the applied step-by-step output control signal and supplying the output of the heating power to the heating unit, wherein the heating power adjusting unit, in order to further increase the output of the heating power as the external air temperature is lower in the case that the external air temperature belongs to any one temperature range among preset temperature ranges, sets the outputs corresponding to the preset temperature ranges respectively to different N output stages and controls the outputs, while the outputs corresponding to the N output stages respectively are controlled to be soft-started.

Description

Power saving heater for preventing be frozen to burst}

The present invention relates to a power-saving freeze protection system. More specifically, it relates to a power-saving freeze protection system capable of power saving and stable device operation by controlling the heating power supplied to the heating element.

As the demand for electricity with high reliability increases due to the improvement of the living standard, the importance of quality in the amount of electricity is emphasized as the supply of advanced precision equipment increases with progress in the information society, and electricity quality is directly connected to the competitiveness of the manufacturing industry, and a large-scale power outage accident. When it occurs, socio-economic confusion may occur.

Among the various factors that make up the quality of electricity, one of the things that is emerging as a new obstacle to the power system is harmonics.

The waveform of the voltage or current of a transmission and distribution line is usually a sine wave, but sometimes it is transformed from a sine wave to a distorted waveform. In this way, a distortion wave is generally composed of a fundamental sine wave and an integer multiple of the frequency of the second harmonic, the third harmonic, and the n-th harmonic, and can be decomposed into a fundamental wave and a harmonic. It can be distorted.

Sources of harmonic currents in the distribution system may be, for example, by magnetic saturation of the core of a transformer, by various conversion devices, by arc furnaces and electric furnaces, and by transient phenomena caused by equipment operation. have.

Among them, when looking at the conversion device, there are many applications of thyristor elements due to advantages such as ease of control and quick response. For example, converting AC into DC, DC chopper, inverter, etc., or There are cycloconverters that convert AC into different frequencies, or power regulators that adjust AC power. In particular, in a situation in which the converter needs to change electricity frequently, harmonic generation is inevitably expected.

The effects of harmonics on various electric devices include the effect of instantaneous phase, distortion of the power supply voltage waveform, the effect on the order of the harmonic current, the waveform distortion and reverse phase of the harmonic current, the effect of image components, the effect of noise and induced disturbances. It is reported that there is a back.

Among them, in the case of the effect on the instantaneous phase, nonlinear loads result in distortion of the power supply voltage due to the nonlinear load current characteristic, and the distortion of this voltage waveform causes problems in other equipment operating nearby. Can lead. Even in the case of distortion of the waveform of the power supply voltage, the pure sine wave contains harmonics, and if it changes into a distorted sine wave, it affects the nonlinear load itself, but even more serious than that, it affects other devices connected to the same system. I can.

In addition, harmonics can affect low voltage capacitors or transformers to become overloaded, and harmonic currents can adversely affect power facilities such as transformers, capacitors, and generators such as abnormal noise, vibration, overheating, and shortening of lifespan. In addition, in the three-phase power supply, even though the three-phase equilibrium is correct, there may be a flow of a current larger than the phase current in the neutral line, because the triple harmonic currents are added together without canceling each other in the neutral wire.

On the other hand, there are many cases of attaching a heating element such as a heating cable to various fluid receptors such as pipes and tanks in winter to prevent freeze, and the problem of excessive power consumption was followed in relation to the operation of heating cables in winter. Therefore, in order to reduce such power consumption, a power-saving power control panel to which a heating power control system capable of adjusting the output of heating power according to the outside temperature has been applied has been popularized. This is because, by adjusting the output of heating power step by step according to the change in the temperature of the outside air, waste of useless electricity can be reduced, leading to power saving.

However, the power control panel introduced in the heating power control system has frequently adversely affected other equipment in the related electric system. The presumed cause of these adverse effects was diagnosed as having a high possibility of high-pitched piles caused by inadvertent heating power control. Therefore, it is necessary to introduce a power-saving freeze prevention control device to which a new control system or method capable of reducing harmonics generated by an unattended control process in the operation of the heating power control system is applied.

The present invention is to solve the problem of the existing step-by-step heating power control panel to provide a power-saving freeze prevention system capable of stably controlling output despite the incessant control of heating power.

Furthermore, the present invention is to provide a new type of power-saving freeze prevention system capable of blocking and diagnosing the occurrence of harmonics in the existing step-by-step heating power control panel, actively reducing them, and at the same time reaping a power saving effect in preventing freeze.

The problem to be solved by the present invention is a fluid receiving portion for accommodating a fluid therein; A heating unit mounted on the fluid receiving unit; An outside temperature sensor disposed around the fluid receiving portion to sense the outside temperature; A control signal applying unit that detects the sensed outdoor temperature and applies a step-by-step output control signal for stepwisely adjusting the output of the heating power to be supplied to the heating unit based on the detected outdoor temperature; And a heating power adjustment unit for adjusting the output of heating power and supplying the heating power to the heating unit based on the applied step-by-step output control signal,

The heating power adjusting unit may output outputs corresponding to preset temperature ranges to each other so that the output of the heating power is further increased as the outside temperature decreases when the outside temperature falls within one of the preset temperature ranges. It can be solved by providing a power-saving freeze prevention system characterized in that the control is set to other N output stages, but the outputs corresponding to each of the N output stages are controlled to be soft-started.

(Here, N output stages consist of 1st, 2nd ... N output stages, where N is a positive integer of 3 or more.)

The heating power adjustment unit, in the case of changing from the first output stage in which the heating power output is OFF among the N output stages to the jumped output stage in any one of the second to N output stages having a higher output, The output of the jumped output stage is controlled to be soft-started according to the start time, and the output of the jumped output stage is kept in the ON state after the first soft-start time has elapsed. The first output OFF step of maintaining the output in the OFF state may be controlled to be sequentially performed.

In addition, the heating power adjusting unit may check which output step is a subsequent output step after the first output OFF step, based on the applied step-by-step output control signal. It is preferable that such a check is performed periodically so that the output of the heating power is controlled for all operating times in which the heating power is supplied.

In addition, the heating power adjusting unit may control the higher output stage among the N output stages so that the duration of the output ON stage increases and the duration of the output OFF stage decreases. Furthermore, it is desirable that the sum of the duration of the output ON step and the duration of the output OFF step is constant.

On the other hand, when the heating power adjustment unit is changed to any one of the second to N output stages from the preceding output stage of the second to N output stages, the subsequent output stage according to the second soft start time. A second output that controls the output to be soft-started and keeps the output of the subsequent output stage in the ON state after the second soft-start time has elapsed. It may be to control the OFF steps to be performed in sequence. In this case, the heating power adjustment unit may check whether the output stage following the second output OFF stage is one of the N output stages based on the applied staged output control signal. Continuous control is possible.

According to an embodiment of the present invention, the problem of the existing step-by-step heating power control panel is solved, and the system can be stably operated despite frequent control of controlling the output of heating power.

In addition, the power system overload problem caused by the existing step-by-step heating power control panel and the problems that occurred to the equipment during operation can be eliminated, and at the same time, it is possible to achieve a power saving effect in preventing freeze.

In addition, it is possible to realize power saving by varying the amount of output according to the outside temperature, and reduce the influence of harmonics generated during phase control by varying according to the output time, and at the same time, it is possible to improve the transient current generated when the initial power is turned on.

1 is a block diagram showing the configuration of an embodiment according to the present inventors power-saving freeze prevention system.
2 is a circuit diagram to which an embodiment according to the power-saving freeze prevention system according to the present invention can be applied.
3 is a diagram showing an example of a power control method of a heating power adjustment unit in an embodiment according to the power-saving freeze prevention system according to the present invention.
4 is a diagram showing an example in which an embodiment operates according to the power-saving freeze prevention system according to the present invention.

Hereinafter, in order to describe in detail enough that a person having ordinary knowledge in the technical field of the present invention can easily implement the technical idea of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In describing a preferred embodiment of the present invention, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted or briefly described.

<Power saving freeze protection system>

1 is a block diagram showing the configuration of an embodiment according to the present inventors power-saving freeze prevention system. As shown in Figure 1, the power-saving freeze protection system of the present embodiment, a fluid receiving portion 110 for accommodating a fluid therein, a heat generating portion 120 mounted to the fluid receiving portion 110, and a fluid receiving portion (110) An outside temperature sensor 130 disposed around and detecting the outside temperature, and the output of the heating power to be supplied to the heating unit 120 are adjusted stepwise based on the detected outside temperature and the detected outside temperature. A control signal applying unit 140 for applying a step-by-step output control signal to be applied, and a heating power adjusting unit 150 for adjusting the output of the heating power based on the applied step-by-step output control signal and supplying it to the heating unit 120 It is composed of.

The fluid receiving unit 110 may be a pipe or a tank that is a fluid reservoir for transporting and delivering a fluid, but is not limited thereto. Anything that includes a fluid inside and which may be freeze or wave due to the influence of the surrounding environment may be included therein.

In addition, the heating unit 120 may be a heating cable that emits heating energy, but is not limited thereto, and may be a metal heater that is recently introduced to prevent freeze on the basis of a convection phenomenon through local heating. In addition, the heating unit 120 may include a PTC heating element (positive temperature coefficient heater).

The outside temperature sensor 130 may use a RTD temperature sensor, among which it is preferable to use a PT 100Ω sensor for low temperature, but is not limited thereto, Any thermometer that can measure temperature can be used regardless of the temperature sensing principle.

The control signal applying unit 140 detects the sensed outdoor temperature and applies a step-by-step output control signal for stepwise adjustment of the output of the heating power to be supplied to the heating unit 120 based on the detected outdoor temperature. . In the present embodiment, a step-by-step output control signal that is divided into six steps is generated by using 4 to 20 mA DC proportionally outputted as the step-by-step output control signal. Referring to FIG. 3, a part marked as TC2-02 may serve as the control signal applying unit 140.

The heating power adjusting unit 150 serves to adjust the output of the heating power based on the applied step-by-step output control signal and supply it to the heating unit 120. Specifically, the heating power adjustment unit 150 responds to preset temperature ranges in order to further increase the output of the heating power as the outside temperature decreases when the outside temperature falls within one of the preset temperature ranges. The outputs are set and controlled in N different output stages, but the outputs corresponding to each of the N output stages may be controlled to be soft-started. (Here, N output stages consist of the first, second ... N output stages, where N is a positive integer greater than or equal to 3, and it should be noted that the definition of N is the same.) Referring to FIG. 3, referring to FIG. The part marked TPR2-6CDN (or TPR2-CDN-6) serves as the heating power adjustment unit 150. In addition, TPR2-CDN-6 may be replaced with another model such as TPR2-CNN-6/TPR2A-CDN-6/TPR2A-CNN-6.

For example, if N output stages consist of 6 output stages, 0% output at 4 to 99 degrees of video, 20% output at 1 to 4 degrees of video, 40% output at -2 to 1 degrees, -5 It can be set as 60% output at ~ -2 degrees, 80% output at -8 ~ -5 degrees, and 100% output at -8 ~ -50 degrees.

In the present embodiment, the heating power adjustment unit 150 controls the output of the heating power by setting it to six output stages, but as described above, the heating power adjustment unit 150 may be divided into smaller or larger output stages. In addition, the heating power adjustment unit 150 has a characteristic of soft start control, which is an operation method that gradually increases to the target output at the beginning of each output step. In the case of changing to any one of the following output stages, it is configured to be gradually performed for 10 minutes, and in the case of changing from any one of the 2nd to N output stages to any of the 2nd to N output stages, the soft start is 2 minutes Consisting of being performed during.

In addition, in each of the N output steps, output ON and OFF steps may be performed in addition to the above-described soft start. That is, when the heating power adjustment unit 150 is changed from the first output stage in which the heating power output is OFF among the N output stages to the jumped output stage in any one of the second to N output stages having a higher output. , A first output ON step for controlling the output of the jumped output step according to the first soft start time to be soft started, and maintaining the output of the jumped output step in the ON state after the first soft start time has elapsed; and The first output OFF step of maintaining the output of the jumping output step in the OFF state may be controlled to be sequentially performed.

Here, in the first output ON step and the second output OFF step, the higher the output step among the N output steps, the longer the duration of the output ON step is increased and the duration of the output OFF step is decreased. Furthermore, it is desirable that the sum of the duration of the output ON step and the duration of the output OFF step is constant.

For example, as shown in the table shown in Fig. 3, if there are 11 output stages, the output of the heating power is OFF at the left 00 ~ 05% input (output according to the output control signal for each stage), and 05 ~ 15 on the left. In% input, it operates to have an output ON phase duration of 1 minute and an output OFF phase duration of 9 minutes. Looking at the first output ON step and the first output OFF step below, it can be seen that the duration of the first output ON step is increased as it goes downward in the table of FIG. 3, and conversely, the duration of the first output OFF step is controlled to decrease. have.

In addition, the heating power adjustment unit 150 may check which of the N output stages a subsequent output stage after the first output OFF stage is applied based on an applied stage output control signal. It is preferable that such a check is performed periodically so that the output of the heating power is controlled for all operating times in which the heating power is supplied.

On the other hand, when the heating power adjustment unit 150 is changed to any one of the second to N output stages from the preceding output stage of the second to N output stages, the second soft start time is followed. The output of the output stage is controlled to be soft-started, and the output of the subsequent output stage is kept in the ON state after the second soft-start time has elapsed. The second output OFF step may be controlled to be sequentially performed.

Here, the durations of the second output ON step and the second output OFF step are the same as in the description of the first output ON step and the first output OFF step described above.

In this case, the heating power adjustment unit 150 may check which output stage after the second output OFF stage is an output stage among the N output stages based on the applied staged output control signal. Continuous control over the power output is possible.

4 is a graph showing an example in which an embodiment operates according to the power-saving freeze prevention system according to the present invention. An example in which this embodiment operates will be described with reference to FIG. 4.

Since the operation is in the initial OFF state when the input is changed from 5% to 15% in the input (off) state of less than 5%, after applying the soft start for 10 minutes, the output is turned on for 1 minute and the output is turned off for 9 minutes, and then the input check is performed. In addition, if the input is 25% ~ 35%, the soft start is applied for 2 minutes due to the input change during operation, and the output is turned ON for 3 minutes and the output is turned OFF for 7 minutes.

If the input falls below 5% (output OFF) and the input is 35% ~ 45%, the operation is in the initial OFF state, so after applying the soft start for 10 minutes, the output is ON for 4 minutes and the output is OFF for 6 minutes, and then the input check is performed.

In case of 35% ~ 45% during input check, after applying soft start 2 minutes due to input change during operation, output 4 minutes ON and 6 minutes OFF operation, then input check is performed.

In case of 45% ~ 55% during input check, after applying soft start for 2 minutes due to input change during operation, output 5 minutes ON and 5 minutes OFF operation, then input check is performed.

So far, the present invention has been described centering on its preferred embodiments. However, the embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art, and the scope of the present invention is not limited to the above embodiments, and various other Of course, it can be transformed into a shape.

110: fluid receiving portion
120: heating part
130: outside temperature sensor
140: control signal applying unit
150: heating power adjustment unit

Claims (6)

A fluid receiving part for receiving a fluid therein;
A heating unit mounted on the fluid receiving unit;
An outside temperature sensor disposed around the fluid receiving part to sense an outside temperature;
A control signal applying unit for detecting the sensed outdoor temperature and applying a step-by-step output control signal for stepwise adjusting the output of the heating power to be supplied to the heating unit based on the detected outdoor temperature; And
And a heating power adjusting unit that adjusts the output of the heating power based on the applied step-by-step output control signal and supplies the heating power to the heating unit,
The heating power adjustment unit,
When the outside temperature falls within one of the preset temperature ranges, outputs corresponding to the preset temperature ranges are different from each other in order to increase the output of the heating power as the outside temperature decreases. It is controlled by setting it to N output stages,
The output corresponding to each of the N output steps is characterized in that it is controlled to soft start,
(Here, N output stages consist of 1st, 2nd ... N output stages, where N is a positive integer of 3 or more.)
The heating power adjustment unit,
When the first output step in which the heating power output is OFF among the N output steps is changed to a jumped output step in any one of the second to N output steps having a higher output, a first soft start The first output ON step and the jumping control to soft start the output of the jumped output step according to time, and maintain the output of the jumped output step in the ON state after the first soft start time elapses. It is to control the first output OFF step to keep the output of the output step in the OFF state in order to be performed, and
The heating power adjustment unit,
It is to check which of the N output steps a subsequent output step after the first output OFF step is based on the applied step-by-step output control signal, and
The heating power adjustment unit,
The power-saving freeze prevention system, characterized in that the higher the output stage among the N output stages, the longer the duration of the output ON stage is increased and the duration of the output off stage is decreased.
delete delete delete The method of claim 1,
The heating power adjustment unit,
When changing from the preceding output step of any one of the second to N output steps to the subsequent output step of any one of the second to N output steps, with respect to the output of the subsequent output step according to the second soft start time The second output is controlled to be a soft start, and the output of the subsequent output step is kept in an ON state after the second soft start time has elapsed, and a second output that maintains the output of the subsequent output step in an OFF state. Power-saving freeze protection system, characterized in that controlling the OFF steps to be performed in sequence.
The method of claim 5,
The heating power adjustment unit,
The power-saving freeze prevention system, characterized in that it checks which of the N output steps a subsequent output step after the second output OFF step is based on the applied step-by-step output control signal.

Images