KR102401654B1 - Electric Fan Heater - Google Patents

Abstract

The present invention relates to an electric fan heater. According to the present invention, voltage is applied to a motor input terminal of a main controller to adjust a volume variable resistor (52) due to rectified voltage at a bridge diode so as to flow current trough a bidirectional switched diac, and a trigger signal is applied to a gate of a triac (54) to control AC voltage so as to control the motor output terminal. Also, when a temperature is dropped, a knob of the volume variable resistor is adjusted in a counterclockwise direction in a speed adjustment module of a motor control unit to adjust a blower speed to a desired level so as to easily operate a heater. In addition, the blower speed is controlled to sufficiently maintain hot air while maintaining an original shape of a vinyl duct mounted on a hot air outlet of a discharge unit of an electric fan heater. According to the present invention, a motor speed is controlled to maximize the output efficiency even with a small load electric fan heater.

Description

Electric Fan Heater

The present invention relates to an electric heater. More particularly, the present invention relates to an electric hot air fan for a plastic house, which improves thermal efficiency by improving the disadvantages of the electric hot air fan by controlling the motor speed so that the output temperature does not drop even in cold weather.

Conventional oil heaters are the main culprits causing odors and fine dust because fuel does not burn completely.

Electric heaters are used in plastic houses, livestock farms, factories, etc. by heating air using an electric heater as a heat source and circulating the heated air for heating. The biggest drawback of electric heaters is that the efficiency of the heaters drops sharply when the temperature drops. To overcome this, the electric capacity is increased, which increases the cost of the consumer and has a significant impact on the increase in power consumption.

Conventional electric hot air blowers have the same motor speed, so when the weather gets cold, the heating efficiency drops sharply. The electric heater is a method of heating the heater and blowing air. When the heater is turned off, the heater is left idle for about 5 to 6 minutes to cool the heater regardless of the weather. This sharply lowers the heating of the space where the electric heater is installed, and at the same time, the heater frequently operates, increasing power consumption.

In the electric heater controller, most of the existing products have a built-in bimetal in the transformer when designing the controller. If the bimetal temperature is higher than the intrinsic temperature, the power is cut off, which inevitably increases the risk of fire.

If the temperature of the controller is set to 7℃, the installation space cannot secure 7℃, and the electric heater is turned off when it reaches 7℃.

As a background technology of the present invention, Republic of Korea Patent Publication No. 10-1348213 "electric hot air fan" hereinafter referred to as "prior art 1") was published. In the prior art 1, the heating means is controlled separately, and the blowing speed of the electric hot air blower is controlled according to the setting input of temperature and current.

1 is an overall configuration diagram of an electric heater.

In the prior art 1, a body part 2 installed on the support part 4, an inlet part 1 for blowing external air to the inside, and a heating means for heating the air sucked through the inlet part 1 are provided. The main body part 2 installed inside, the outlet part 3 connected to the heating means inside the main body part 2, and the outlet becomes smaller in the direction in which the heated air is discharged, and the blowing speed of the inlet part 1 . And, a sensor unit for sensing the temperature and current of the heating means, controlling the blowing speed of the inlet according to the sensing result of the sensor unit, adjusting the temperature setting and the current setting according to an external input, and separating the heating unit of the main body It is characterized in that it comprises a control unit (5) to control.

In the prior art 1, when the heater malfunctions, it is difficult to replace the heater in the process of stopping and inspecting the operation of the electric heater, and the electric heater is heated to the desired indoor temperature in a plastic house, livestock farm, factory, etc. There is a problem in that it is difficult to maintain the set temperature.

Republic of Korea Patent Publication No. 10-1920843 "SCR Power Control Device for Heater Control" (hereinafter referred to as "Prior Art 2") has been disclosed.

Prior art 2 includes a transformer for transforming an AC voltage applied from an input AC power source, a plurality of diodes, a rectifier for rectifying the transformed AC voltage, and smoothing the rectified AC voltage to generate a DC voltage and a ground voltage a DC-DC converter unit, and a gating signal generating unit generating an SCR gating signal using the cathode voltage of a first diode among the plurality of diodes and the ground voltage, and a difference value between the reference temperature and the current heater temperature to the hysteresis controller A heater temperature control unit that generates a heater temperature control signal by input and transmits the heater temperature control signal to the gating signal generation unit, the anode of the first diode and the ground generated by the DC-DC converter unit to the gating signal generation unit and a ground power supply unit for applying a voltage, an SCR switch unit connected between the input AC power source and the heater, and switched in response to the outputted SCR gating signal.

In the prior art 2, it is possible to simultaneously generate the DC power required for the SCR power control circuit while detecting the zero crossing point of the AC voltage with two transformers, thereby reducing the complexity and volume of the configuration of the SCR power control device, and lowering the manufacturing cost. there is an advantage

(Patent 0001) Patent Registration No. 10-1348213 (Patent 0002) Patent Registration No. 10-1920843 (Patent 0003) Patent Registration No. 10-0828573 (Patent 0004) Patent Registration No. 10-1880932

The present invention has been devised to solve the problems of the prior art, and an object of the present invention is to improve the thermal efficiency by improving the disadvantages of the electric warmer by controlling the motor speed of the electric warmer so that the output temperature does not drop even in cold weather. To provide an electric heater.

The electric heater of the present invention is composed of a main body, a main control unit, a motor control unit and a sensor unit; the body part is composed of an inlet part, an outlet part, a control part and a cylindrical support part; the main control unit is composed of a setting module, a blower control module, a heater control module, an error output module, a manual input module and an automatic input module; In the blower control module, the speed control circuit is composed of a bridge diode, a volume resistor, a diac, a triac, a main controller motor input terminal, and a motor output terminal; A voltage is applied to the input terminal of the main controller motor, a current flows through the diac that is switched in both directions by adjusting the volume variable resistance due to the rectified voltage in the bridge diode, and an AC voltage is obtained by applying a trigger signal to the gate of the triac In the known electric hot air fan, characterized in that the control and output to the motor output terminal to control the speed of the motor,
A voltage is applied to the input terminal of the main controller motor, and the volume variable resistor is adjusted due to the rectified voltage on the bridge diode, so that a current flows in the diac that is switched in both directions. control the terminal; When the temperature drops, the speed control module of the motor control unit adjusts the knob of the volume variable resistor counterclockwise to adjust the blower speed to a desired position to facilitate the heater operation; The vinyl duct mounted at the hot air outlet of the electric hot air fan outlet by controlling the blower speed maintains its original shape while maintaining sufficient hot air.

delete

delete

According to the present invention, the output efficiency can be maximized even with a small load electric hot air fan by developing an SCR control kit for controlling the motor speed and controlling the speed.

In addition, according to the present invention, if 7 ℃ of the controller temperature is set, the installation space cannot secure 7 ℃ and the electric heater becomes large at the moment it becomes 7 ℃. It has the effect of securing sufficient installation space by designing the electric heater to be large.

In addition, according to the present invention, in order to minimize the starting current when the electric warm air blower is started, a delay function in which the motor starts after the heater is operated is added, thereby minimizing the power consumption during starting, thereby saving energy.

1 is an overall configuration diagram of a conventional electric hot air fan.
2 is a block diagram of an electric hot air blower according to an embodiment of the present invention.
3 is a circuit diagram of an electric hot air fan speed control according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of the electric hot air fan according to the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of an electric hot air blower according to an embodiment of the present invention, and FIG. 3 is a circuit diagram for controlling a speed of a hot air blower according to an embodiment of the present invention. 4 is a flowchart illustrating an operation of the electric hot air blower according to the present invention.

In the embodiment of the present invention, most of the conventional electric heater controllers have a bimetal built-in in the transformer when designing the controller, and the power is cut off when the temperature is higher. This is bound to be a high fire hazard. In the present invention, TNY semiconductor was introduced and digitally blocked when it was 75℃ or higher inside, so that it was designed according to home appliances.

The electric hot air blower of the present invention was developed by devising and maximizing an efficient method by putting the highest priority on safety in repeating operation by operating a heater and blowing the warm air to reach and maintain a set temperature at the installation location.

2 is a block diagram of an electric hot air blower according to an embodiment of the present invention.

The electric heater of the present invention includes a main body 10 , a main control unit 20 , a motor control unit 30 , and a sensor unit 40 . The main body 10 includes an inlet 11 , an outlet 12 , a controller 13 , and a cylindrical support 15 .

The inlet 11 is composed of a ventilation passage (inlet) and a safety net. The safety net has a grid hole as much as possible so as not to obstruct the inflow of air to the place where the air is injected into the hot air fan, and for safety, it is designed in a structure that does not allow fingers to enter.

The control unit 13 is composed of a circuit breaker, an electromagnetic contactor or a non-contact relay, and a motor starting capacitor. When used in a plastic house, etc., water can penetrate, so a safety net can be additionally installed on the upper part of the main body 10 . Here, the magnetic contactor or non-contact relay is a device that transmits power to the heater, and when a product is selected according to the capacity of the heater, the capacity of the main breaker is set accordingly.

The cylindrical support 15 includes a blower (motor fan), heaters (2Kw, 3Kw), and a bimetal. The cylindrical support 15 has a structure in which a blower motor is installed in a cylinder, and a fan is installed to match the size of the cylinder, so that a large amount of air can be sent away. After the fan, a circular cartridge heater is installed to efficiently raise the air temperature.

A bimetal is installed on the outside of the cylinder between the fan and the heater to automatically shut off the operation when the cylinder exceeds 90℃.

The discharge unit 12 is composed of a hot air outlet and a safety net. A tornado safety net is installed so that the hot wind does not interfere with it. If a vinyl duct is installed here, enough warm air is transmitted even at a distance of about 100m.

The main control unit 20 includes a setting module, a blower control module, a heater control module, an error output module, a manual input module, and an automatic input module.

The blower control module is a place for setting the module of the operation of the electric warmer, and it is possible to set the time when the blower is stopped when the blower is operating. This increases the efficiency of the electric heater. The heater control module can control the operation time of the heater to secure the stability of the heater and optimize the electricity consumption.

delete

The error output module generates a warning sound according to the temperature sensor disconnection or short circuit and stops the operation of the hot air fan, and the cylindrical bimetal is an overheat prevention sensor.

The motor control unit 30 is a blower speed control module, and when the external temperature decreases, the function of the hot air fan is greatly reduced.

The sensor unit 40 includes a current temperature detection module, a heating temperature detection module, an error detection module, a motor detection module, a cylinder detection module, and a controller detection module.

The detection module of the main control unit 20 automatically stops the operation of the hot air fan when the inside of the TNY semiconductor PCB reaches 75° C. in the PCB detection.

In one embodiment of the present invention, stability was secured compared to the conventional bimetal, and reliability of the product was increased due to various safety devices. The bimetal method uses a TNY semiconductor device in the present invention because there is a risk of fire when the internal temperature of the main control unit protection device PCB is 75° C. or higher.

3 is a circuit diagram of an electric hot air fan speed control according to an embodiment of the present invention.

A technical feature of the electric hot air blower according to an embodiment of the present invention is that the operating time of the blower can be adjusted according to weather and temperature changes.

The speed control circuit 50 of the electric heater related to the blow control module includes a bridge diode 51, a volume variable resistor 52, a diac 53, a triac 54, a main controller motor input terminal 55 and It is composed of a motor output terminal (56).

In general, unidirectional switching control, that is, direct current (DC) control, is SCR. MOSFET and BJT are very effective, while TRIAC (TRIAC) 54 is a component that switches in both directions by connecting two SCRs. Unlike the existing SCR, it is more effective than the SCR when controlling the AC power because it allows current to flow in both directions when it is ON. TRIACs can be used to control AC voltages and currents.

Diac (diac) 53 is turned on when the voltage at both ends is greater than the breakover voltage. If the diac is turned ON in two stages, if a current greater than the minimum current that can maintain the ON state flows, it is continuously maintained in the ON state. Diac is used to control AC voltage by applying a trigger signal to the gate of SCR or triac.

[Electric hot air fan speed control]

3 shows that a voltage is applied to the main controller motor input terminal 55 and the volume variable resistor 52 is adjusted due to the rectified voltage in the bridge diode 51 so that a current flows in the diac 53, which is switched in both directions, and the triac ( 54) by applying a trigger signal to the G (gate) to control the AC voltage to control the motor output terminal (56).

The semiconductor DB3 Diac 53 shown in FIG. 3 has two poles and operates as a bidirectional switch with no polarity. When the voltage at both ends exceeds a certain value, it conducts and current flows. However, once the current starts to flow, as long as a certain minimum current is maintained, the current continues to flow even if the voltage goes down.

[AC power control method]

By controlling the voltage AC220V from the main controller 20 to the main controller motor input terminal 55 and outputting it to the motor output terminal 56, the speed of the motor can be adjusted.

Since the phase control is performed and high-speed conversion is required, the on/off control can be made to the gate voltage control by using the triac 54 like an AC power controller. The DIAC 53 controls the AC voltage by applying a trigger signal to the gate of the TRIAC 54 . When an instantaneous voltage is added to the triac 54 gate (G) and a current flows, the triac 53 T1 conducts and AC220V changes with respect to the load. And when the sine wave of AC220V voltage reaches 0V, the triac is off.

This is repeated every half cycle of the sine wave, and an alternating current in the form of which a part of the sine wave is cut off participates in the load. The AC power participating in this load is turned on because it is proportional to the area of the waveform. By changing the position, the power can be varied.

[Motor speed control according to weather/temperature change]

A voltage is applied to the main controller motor input terminal 55 and the volume variable resistor 52 is adjusted due to the rectified voltage on the bridge diode 51 so that a current flows in the diac 53, which is switched in both directions, and the triac 54 The motor output terminal 56 is controlled by applying a trigger signal to G (gate) to control the AC voltage.

When the temperature drops, the speed control module of the motor control unit 30 adjusts the knob of the volume variable resistor 52 VR500KΩ in a counterclockwise direction to adjust the blower speed to the desired position to facilitate the operation of the heater. The optimal hot air effect can be achieved without deteriorating the function of the air conditioner.

Even if the blower speed is reduced by 3/1 or more, the vinyl duct 100M mounted on the hot air outlet of the electric hot air blower discharge unit 12 maintains its original shape while sufficiently maintaining the warm air function.

In the electric heater of the present invention, the heater control module sets the delay time in units of 1 second, and the blower control module adjusts the set time in units of 1 minute.

When the temperature drops, the warm air effect can be maximized by reducing the blowing operation time to lower the heater temperature.

The electric warm air blower of the present invention operates a heater to blow air by the blower.

When the set temperature is reached, the heater turns on during operation and the blower operates after a delay of 2 seconds. The reason that the blower operates later than the heater is to lower the starting current and to speed up the temperature rise of the heater even a little. As the weather gets colder, the delay time can be increased to further increase efficiency.

Conversely, when the electric hot air blower is stopped, the heater is turned off first, and the blower operates for a set time and turns off to lower the temperature of the heater.

This lowers the temperature of the heater, protects the equipment in the main body, and extends the life of the equipment. When the weather gets cold, unnecessary heat loss can be prevented by minimizing the fan operation time when the hot air fan is stopped.

In addition, if the stop button position of the main controller 20 is pressed for 10 seconds, the setting mode is changed. Here, the delay time can be set in units of 1 second in the heater control module. It is a feature of the present invention that by adjusting the set time in units of 1 minute in the blower control module, the efficiency can be maximized by reducing the idle time of the blower when the external temperature is lowered.

The heater used in one embodiment of the present invention is a sheath heater. The sheath heater has excellent responsiveness and quality for each capacity.

4 is a flowchart illustrating an operation of the electric hot air blower according to the present invention.

The operation sequence of the electric hot air device according to an embodiment of the present invention is as follows.

When the power circuit breaker is turned on, the main control unit 20 is lit and the state is ready for normal operation. Set the required temperature and set the operating time. In order to operate continuously automatically, it can be operated by setting the time to infinity.

When the function button of the main controller 20 is briefly pressed in the stop state, the operation is started while being positioned in the warm air state.

The operation of the electric hot air blower operates when the set temperature is higher than the current temperature according to the control of the main control unit 20 . When the current temperature reaches the set temperature (+1), the heater increases and the blower stops after the set time elapses.

The main control unit 20 compares the current temperature with the set temperature, and when the current temperature is lower than the set temperature, the heater is operated and the motor fan is started after 2 seconds. However, if the current temperature is higher than the set temperature, the heater stops and the motor fan stops after 2 minutes.

According to the conditions of the setting module of the main control unit 20, the hot air fan automatically repeats ON/OFF operation. The operation method of the electric hot air fan of the present invention is as follows.

(1) Step 1: Turn on the power breaker and set the set temperature and operating time (2) Step 2: Compare the current temperature with the set temperature in the main control unit 20

delete

If the current temperature is lower than the set temperature, the heater operates, and the motor fan starts after 2 seconds. If the current temperature is higher than the set temperature, the heater stops and the motor fan stops after 2 minutes.

delete

delete

Although the present invention has been described and illustrated in connection with preferred embodiments for illustrating the principles of the present invention, the present invention is not limited to the construction and operation as so shown and described. All suitable changes, modifications and equivalents without departing from the scope of the matter set forth in the appended claims are to be construed as falling within the scope of the present invention.

10: body part 11: inlet part
12: discharge unit 13: control unit
15: cylindrical support 20: main control unit
30: motor control unit 40: sensor unit
50: speed control circuit 51: bridge diode
52: volume variable resistor 53: diac
54: triac 55: main controller motor input terminal
56: motor output terminal

Claims (5)

it is composed of a body part, a main control part, a motor control part and a sensor part;
The body portion is composed of an inlet (11), an outlet (12), a control section (13) and a cylindrical support (15); the main control unit is composed of a setting module, a blower control module, a heater control module, an error output module, a manual input module and an automatic input module;
In the blower control module, the speed control circuit includes a bridge diode 51 , a volume variable resistor 52 , a diac 53 , a triac 54 , a main controller motor input terminal 55 and a motor output terminal 56 . composed;
A voltage is applied to the main controller motor input terminal 55, and a current flows in the diac 53, which is bidirectionally switched by adjusting the volume variable resistor 52 due to the rectified voltage in the bridge diode 51, and the tri In the electric heater, characterized in that by applying a trigger signal to the gate of the liquid (54) to control the AC voltage and output it to the motor output terminal (56) to control the speed of the motor,
A voltage is applied to the main controller motor input terminal 55 and the volume variable resistor 52 is adjusted due to the rectified voltage in the bridge diode 51 so that a current flows in the diac 53, which is switched in both directions, and the triac 54 controlling the AC voltage by applying a trigger signal to the gate of the motor output terminal 56;
When the temperature drops, the speed control module of the motor control unit 30 controls the knob of the volume variable resistor 52 counterclockwise to adjust the blower speed to a desired position to facilitate the heater operation; An electric hot air fan, characterized in that the vinyl duct mounted at the hot air outlet of the electric hot air fan discharge unit (12) by controlling the speed of the blower maintains a circular shape while maintaining sufficient warm air.




delete delete delete delete

Images