KR100675094B1 - Apparatus for controlling of air blower motor in boiler system and method thereof - Google Patents

Abstract

Disclosed is a control apparatus adapted to control a rotational speed of a boiler blower motor by adjusting a temperature and a pressure of a fluid discharged from a boiler body. The apparatus includes a boiler body for heating the fluid flowing into the fluid inlet by a fire power corresponding to the amount of fuel and air introduced into the burner and discharging the fluid into a steam discharge pipe; A calorie detector configured to output a calorie sensing signal by sensing a pressure / temperature of steam installed in the steam exhaust pipe and discharged; A damper installed inside the air duct connected to the air inlet of the boiler, the damper including a sensor for opening and closing the passage of the air duct in response to the input of a damper driving signal, and detecting the opening and closing of the air duct and outputting an open / close detection signal; ; A blower connected to the other side of the air duct and sucking external air corresponding to rotation of an internal blower motor and supplying the air to the air duct; An inverter for generating an AC voltage corresponding to the input of the PWM driven frequency to drive the blower motor of the blower; A damper drive signal and a drive frequency corresponding to an initial set initial value are outputted to the damper and inverter, and the damper drive signal is proportionally controlled by adapting to the detection signal of the calorie sensor and at the same time, the opening and closing of the air duct is detected. It is configured to include a controller adapted to proportionally control the driving frequency.

Inverter, boiler blower, damper, position detector, pressure sensor, temperature sensor, blower motor,

Description

Control device of boiler blower motor and its control method {APPARATUS FOR CONTROLLING OF AIR BLOWER MOTOR IN BOILER SYSTEM AND METHOD THEREOF}

1 is a block diagram of a boiler blower motor control apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram according to a specific embodiment of the controller shown in FIG. 1. FIG.

3 is a control flowchart of a boiler blower motor according to a preferred embodiment of the present invention.

4 is a view showing a control pattern of a damper and a blower according to a preferred embodiment of the present invention.

<< explanation of the code about part of drawing >>

10: boiler blowing motor control device 12: boiler body,

14 burner, 16 fluid inlet,

18: steam discharge pipe, 20: heat detection sensor,

24: air inlet, 26: damper,

28: damper position detector, 30: blower,

32: blower motor, 34: inverter,

36 controller, 40 MCU (micro control unit),

42: operation panel, 44, 46: memory 1, memory 2,

The present invention relates to a control device for controlling the rotational speed of the boiler blower motor and a control method thereof, and more particularly, to a control device adapted to control the rotational speed of the boiler blower motor by adapting the temperature and pressure of the fluid discharged from the boiler body. It relates to a control method.

Typically, industrial or domestic boilers and the like can maintain the optimum combustion efficiency only by supplying fuel and air corresponding to the combustion load rate to the burners. Therefore, most boilers and the like are provided with a device for supplying and controlling fuel and air corresponding to the combustion load rate so that the combustion efficiency of the burner is maintained at an optimum state.

A conventional technique for controlling the amount of air supplied to a burner of a boiler is disclosed in Korean Utility Model Publication No. 20-0351366 (inverter drive system for motor speed control of a boiler blower).

The utility model pre-registered saves the set frequency of the inverter according to the combustion of the boiler so as to correspond to the load ratio of the multi-stage (e.g., 10 stages) and stores it in the memory, and then enables the reading of the set frequency value to prevent the boiler from burning. When the load ratio signal is input, the motor frequency of the boiler blower can be easily adjusted by digital up / down key by operating the frequency value of the inverter system by reading the set frequency value according to the load ratio. An inverter device is disclosed.

However, the conventional technique disclosed in the above-mentioned registered utility model has a combustion load rate of 100, with every 10% unit being one control step when the load rate change according to the boiler combustion is 10 steps, for example, the maximum combustion load rate is 100%. In the case of%, the rotational speed of the blower motor could not be finely adjusted by adopting a step wave type control method such that the rotational speed of the blower motor was maximized.

That is, the combustion efficiency was not high because the rotational speed control of the blower motor was not directly controlled in proportion to the combustion load rate. In addition, the combustion control of the boiler has a complicated problem by independently controlling the opening and closing of the damper for controlling the blower pressure of the blower and the rotational speed of the blower motor.

It is therefore an object of the present invention to provide an apparatus and method for controlling the rotational speed of a blower motor in proportion to the steam pressure or steam temperature of a boiler body.

It is another object of the present invention to provide a boiler blower motor rotation control apparatus and a control method which can integrally control the control of the rotational speed of the blower motor according to the boiler combustion load rate in synchronization with the opening and closing control of the damper for adjusting the blower pressure of the blower. In providing.

Still another object of the present invention is to control a damper for controlling the wind pressure of the blower in proportion to the steam pressure or the steam temperature of the boiler body, and to control the rotational speed of the blower motor in proportion to the opening / closing degree of the damper. An apparatus and a control method thereof are provided.

The present invention for achieving the above object, the boiler body for heating the fluid flowing into the fluid intake (intake) with a fire power corresponding to the amount of fuel and air introduced into the burner to discharge to the steam out-take (out-take); A calorie detector for sensing and outputting a calorie corresponding to the pressure / temperature of steam that is installed in the steam exhaust pipe of the boiler body and discharged; It is installed inside an air duct connected to the air inlet of the boiler and opens and closes the passage of the air duct in response to an input of a damper driving signal DDS (Damper Driving signal), and detects the opening and closing of the air duct. A damper having a sensor for outputting a detection signal A-OC (air duct open / close); A blower connected to the other side of the air duct and sucking external air corresponding to rotation of an internal blower motor and supplying the air to the air duct; An inverter for generating an AC voltage corresponding to an input of a PWM (pulse with modulation) input driving frequency (INDF) to drive the blower motor of the blower; A damper drive signal DDS and a drive frequency INDF corresponding to an initial starting operation value are output to the damper and inverter, and the damper drive signal DDS is proportionally controlled in response to the detection signal of the pressure sensor, and at the same time, the air The controller is configured to control the driving frequency INDF proportionately by adapting the opening and closing of the doc to the sensing state.

The damper may be implemented in a configuration that is opened and closed by a step motor driven step by a drive signal such as a step pulse. In addition, the damper is characterized in that it comprises a position sensor (position sensor: potentiometer) for detecting the position change of the opening and closing sides for opening and closing the passage of the air duct and outputs a corresponding detection signal.

The controller includes an operation panel provided with a plurality of operation keys for setting initial operation values according to a user's selection; The memory 1 stores the initial operation value, the heat detection signal T · PSS (temperature / press sensing signal) of the heat detection sensor, and the damper drive signal DDS corresponding to the air duct opening / closing detection signal A-OC, and a driving frequency, respectively. first memory and second memory; The damper drive signal DDS and the drive frequency INDF corresponding to the initial operating value from the operation panel are accessed from the memory 1 and the memory 2 and provided to the damper and the inverter, and the calorie detection signal T.PSS and the air duct And a damper driving signal DDS adapted to the switching amount A-OC and a microprocessor control unit (MCU) for controlling the driving frequency INDF in proportion.

In the boiler blower motor control method according to another principle of the present invention, the damper located inside the air duct connected to the burner of the boiler main body in a predetermined state according to the setting of the initial operating value and at the same time connected to the other side of the air duct Driving a motor of the blower for supplying external air to the air duct in response to the input of a rotational drive control signal, and closing amount of the damper in proportion to the output of a heat detection sensor installed at the steam discharge pipe side of the boiler body. And controlling the voltage provided to the blower motor to increase in response to the closing amount of the damper.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth. It should be noted that the embodiments of the present invention described below are intended to sufficiently convey the spirit of the present invention to those skilled in the art.

1 is a block diagram of a boiler blower motor control apparatus according to an embodiment of the present invention.

In Fig. 1, reference numeral 12 denotes a boiler body, which burns the flame corresponding to the air supplied to the air duct 24 and the fuel input to the fuel injection inlet (not shown) (ignition operation of the ignition device). Is omitted because it is a well known technique. The burner 14 heats the fluid passing between the fluid inlet 16 and the steam discharge pipe 18.

That is, the burner 14 heats the fluid introduced from the fluid inlet 16 and sends it to the steam discharge pipe 18. For example, a fluid such as water is heated and discharged into hot steam. The steam discharge pipe 18 side of the boiler body 12 is provided with a temperature sensor for detecting the temperature of the hot steam discharged or a pressure sensor for detecting the discharge pressure of the steam discharge pipe (18). In the embodiment of the present invention, both the temperature sensor or the pressure sensor may be applied, and the two sensors are defined as calorie detection sensors 20.

The other side of the air duct 24 is connected to the blower 30, the damper 26 is opened in a predetermined state in accordance with the damper driving signal DDS is installed in the air duct 24 is installed. At this time, the damper 26 is provided with a position detector 28 for detecting the state of the open / closed of the damper opening and closing the opening and closing according to the damper driving signal DDS. The position detector 28 detects the position of the open / close side of the damper 26 to generate the open / close state detection signal A-OC of the air duct 24.

Inside the blower 30 is provided with a motor 32 for supplying external air to the air duct 24 in response to an input voltage, the motor 32 is a drive voltage output from the inverter 34 The rotation speed is determined by

The inverter 32 generates a driving voltage corresponding to the input frequency of the driving frequency INDF and outputs the driving voltage as the driving voltage of the motor 32. In this case, the driving frequency INDF means a driving frequency of the inverter 32 as a pulse width modulated (PWM) pulse train. Such an inverter 32 may use an inverter already known in the art as it is.

The controller 36 outputs the damper driving signal DDS and the driving frequency INDF corresponding to the input of the operation value initially set by the boiler operator to the damper 26 and the inverter 34 to damper 26 in the air duct 24. By controlling to open to the preset initial position and at the same time to drive the inverter 34 so that the motor 32 of the blower 30 is initially driven at a preset rotational speed.

Subsequently, when the boiler is operated, the controller 36 adapts to the output of the calorie detection signal T · PSS of the calorie detection sensor 20 installed on the steam discharge pipe 18 side of the boiler body 12 to adjust the output of the damper 26. The rotation speed of the motor 32 is controlled by controlling the opening / closing amount and controlling the frequency of the driving frequency INDF provided to the inverter 34 by adapting the opening / closing amount of the damper 26.

That is, after the burner 14 of the boiler body 12 is ignited, the controller 36 adapts to the output of the calorie detection sensor 20 on the steam discharge pipe 18 side to drive the drive signal DDS of the damper 26. And generating and outputting a driving frequency INDF of the inverter 34 to make the rotational speed of the motor 32 of the blower 30 proportional to the combustion load ratio in real time.

Operation details as described above in FIG. 1 will be clearly understood by the following configuration description and operation description.

FIG. 2 is a block diagram according to a specific embodiment of the controller shown in FIG. 1. Referring to Fig. 2, the controller 36 includes an operation panel 42 provided with a plurality of operation keys for setting initial operation values according to a user's selection; Memory 1 (first memory) 44 and Memory 2 which respectively store the initial operation value, the heat detection signal T · PSS and the damper drive signal DDS corresponding to the air duct open / close detection signal A-OC and the driving frequency INDF, respectively. second memory 46; The damper drive signal DDS and drive frequency INDF corresponding to the initial operation value from the operation panel 42 are accessed from the memory 1 44 and the memory 2 46 to the damper 26 and the inverter 34. MCU for providing and proportionally controlling the damper drive signal DDS and the drive frequency INDF adapted to the calorie detection signal T.PSS and the opening / closing amount A-OC of the damper 26 in the air duct 24. 40).

3 is a control flowchart of a boiler blower motor according to an exemplary embodiment of the present invention, which is an operation control processor of the controller 36 of FIG. 1 and the MCU 40 of FIG. 2, and a ROM inside the MCU 40. It is a masked program in the area. 4 is a view showing a control pattern of a damper and a blower according to a preferred embodiment of the present invention.

Now, when the boiler operator "turns on" an operation switch, for example, a power switch, located on the operation panel 42 shown in Fig. 2, and then adjusts the temperature control switch to set the set temperature, the MCU 40 shows the figure. It is determined that the operation switch is "on" in step S10 of 3 and the initial drive signal DDS (initial opening amount of the air duct) of the damper 26 and the driving frequency INDF for initial operation of the inverter 34 are stored in step S12. Access from (44) and output. Thereafter, the burner 14 of the boiler body 12 is ignited.

For example, the MCU 40 outputs a damper drive signal DDS corresponding to an initial point (IP) point of FIG. 4 and a drive frequency INDF according to an initial operating value, thereby opening the damper 26 and simultaneously inverter 34. To drive. At this time, the inverter 34 outputs a driving voltage corresponding to the input of the driving frequency INDF to the motor 32 of the blower 30 to rotate the motor 32. Here, the damper driving signal DDS corresponding to the IP is a signal for opening the damper 26 by approximately 50% to 60%, and the driving frequency INDF corresponding to the IP causes the motor 32 to be 50% to 60% of the maximum rotational speed. Initial settings for running at%.

As shown in FIG. 4, when the damper 26 in the air duct 24 is misaligned to the initial IP position and the motor 32 of the blower 30 is driven to rotate at the rotational speed of the initial IP, the MCU 40 Reads the output TPSS of the calorie detection sensor 20 installed in the steam discharge pipe 18 of the boiler body 12 in step S14 of FIG. As the calorie detection sensor 20 applicable in the present invention, a temperature sensor for detecting a high temperature steam temperature or a pressure sensor for detecting steam pressure on the steam discharge pipe 18 side may be applied.

The MCU 40, which detects the boiler operating state by reading the output of the calorie detection sensor 20 in step S14 of FIG. 3, controls the opening degree of the damper 26 in response to the sensed temperature / pressure in step S16. The damper drive signal DDS is accessed from memory 1 (44). The memory 1 44 stores a lookup table of information on the opening angle of the damper 26 corresponding to the sensed temperature / pressure (see DDS26 of FIG. 4).

Therefore, as shown in FIG. 1, the damper 26 installed in the air duct 24 is a damper driving signal that is proportionally output from the MCU 40 as shown in the DDS26 of FIG. 4 according to the operating state of the boiler body 12. Opening and closing is driven by the DDS to adjust the amount of air supplied to the boiler body (12). For example, when the detected temperature is low or the pressure is low, the damper 26 is controlled to be opened less. On the contrary, when the detected temperature is high or the pressure is high, the damper 26 is controlled to be opened.

The MCU 40 performing the S16 process of FIG. 3 reads the output A-OC of the position detector 28 that detects the opening / closing amount of the damper 26 in the process S18 of FIG. The drive frequency INDF adapted to the output A-OC of the position detector 28 is accessed from the memory 2 46 and provided to the inverter 34. At this time, the memory 2 (46) stores the value of the drive frequency INDF of the inverter (43) capable of generating the air blowing amount of the motor (32) corresponding to the opening and closing amount of the damper (26) installed in the air duct (24). It is.

For example, when the opening angle of the damper 26 is large, the driving frequency INDF provided to the inverter 34 is increased to increase the driving voltage of the motor 32. When the opening angle of the damper 26 is small, the motor ( The driving frequency INDF provided to the inverter 34 is lowered to output the driving voltage of the 32. Therefore, the driving frequency INDF provided to the inverter 34 is increased or decreased in proportion to the opening / closing angle of the damper 26 installed in the air tact 24, and thus, the heat detection sensor 20 installed in the steam discharge pipe 18. It can be seen that it is controlled as shown in FIG. 4 in proportion to the output of.

Operation control of such a boiler is repeatedly performed continuously until the operation switch is "off" (S22). Therefore, the rotational speed control apparatus of the boiler blower motor according to the present invention is a real-time driving frequency of the damper and inverter to change the air volume of the blower in proportion to the steam temperature or steam pressure detected by the heat quantity sensor installed on the steam discharge pipe side of the boiler body By changing and controlling linearly, it is possible to more precisely control the amount of air in the boiler body burner, thereby increasing the combustion efficiency.

In addition, the power consumption can be reduced by increasing or decreasing the driving frequency of the inverter for controlling the rotation of the blower motor in proportion to the steam temperature or the steam pressure.

As described above, the motor rotation control apparatus of the boiler blower according to the present invention adapts to the steam pressure of the steam discharge pipe of the boiler body or the temperature of the steam discharged to the steam discharge pipe, the opening and closing amount of the damper opening and closing speed and the rotational speed of the blower motor By real-time proportional control of the boiler operation control can improve the combustion efficiency of the boiler, it is possible to reduce the power consumption, and to operate the boiler more precisely than to control the speed of the motor step by step.

Claims (4)

In the motor control apparatus of the boiler blower having a boiler body for heating the fluid flowing into the fluid inlet to the steam discharge pipe by heating the fuel to the burner according to the amount of fuel and air, A pressure sensor installed at a steam discharge pipe of the boiler body to detect and output pressure of steam discharged; A damper installed inside the air duct connected to the air inlet of the boiler, the damper including a sensor for opening and closing the passage of the air duct in response to the input of a damper driving signal, and detecting the opening and closing of the air duct and outputting an open / close detection signal; ; A blower connected to the other side of the air duct and sucking external air corresponding to rotation of an internal blower motor and supplying the air to the air duct; An inverter for generating an AC voltage corresponding to an input of a driving frequency to drive the blower motor of the blower; A damper driving signal and a driving frequency corresponding to an initial set operation value are output to the damper and inverter, and the damper driving signal is proportionally controlled by adapting the detection signal of the pressure sensor and the opening and closing of the air duct is adapted to the sensing state. Rotor control device of the boiler blower motor, characterized in that it comprises a controller for proportionally controlling the drive frequency. The rotation control apparatus of a boiler blower motor according to claim 1, wherein the damper includes a position detector which detects a position change of an opening / closing valve for opening and closing an air duct and outputs a corresponding detection signal. The apparatus of claim 1 or 2, wherein the controller comprises: an operation panel provided with a plurality of operation keys for setting an initial operation value according to a user's selection; A memory for storing the initial operating value, the damper driving signal corresponding to the pressure sensing signal, and the air duct opening and closing sensing signal and a driving frequency, respectively; A damper drive signal corresponding to the initial operating value from the operation panel and a drive frequency from the memory and provided to the damper and the inverter, the damper drive signal adapted to the opening and closing amount of the pressure sensing signal and the air duct; Rotation control device of the boiler blower motor, characterized in that configured as an output to control the drive frequency proportional to the MCU. In the control method of the boiler blower motor, According to the setting of the initial operation value, the damper located inside the air duct connected to the burner of the boiler main body is opened in a predetermined state, and is connected to the other side of the air duct to receive external air in response to the input of the rotation drive control signal. Driving a motor of the blower to supply the air duct, Controlling the closing amount of the damper in proportion to the output of the heat detection sensor installed on the steam discharge pipe of the boiler body, and controlling the voltage supplied to the blower motor to increase in response to the closing amount of the damper. The control method of the boiler blower motor characterized by the above-mentioned.

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