JPH1061951A - Operation checking method for inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect whether the adjustment of the amount of air supplied is made accurately or not in a boiler which uses an inverter to adjust the amount of air supplied. SOLUTION: The frequency of a current to be fed to a blower motor 7 is altered by an inverter 8, the rotational speed of the blower motor 7 is changed to adjust the amount of air supplied and the amount of a fuel to be supplied to a boiler is controlled to perform a combustion at three positions of high combustion, low combustion and stoppage. In a boiler 1 of such a type, a frequency detector 11 is provided to detect an operation frequency to be sent to the blower motor 7 by the inverter 8. Then, a frequency for checking operation is previously set between a frequency value for high combustion and a frequency value for low combustion. When altering the frequency by the inverter 8, an operation frequency detected by the frequency detector 11 is compared with the frequency for checking operation. If the operation frequency altered passes the frequency for checking operation, the operation of the inverter 8 is determined to operate normally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming the operation of an inverter device in a blower in which the rotation speed of a blower motor is changed using the inverter device.

[0002]

2. Description of the Related Art In the case of a boiler in which combustion control is performed at three positions of high combustion, low combustion, and stop, it is necessary to change the supply amount of combustion air in accordance with the fuel supply amount. As a method of adjusting the air supply amount, a damper is provided between the blower and the combustion device, and a method of adjusting the opening degree of the damper, or connecting an inverter device to the blower motor, and using the inverter device to control the rotation speed of the blower motor There is a method of changing the air supply amount and adjusting the air supply amount. In the case where the air supply amount is adjusted by using the inverter device, the effect of reducing power consumption and noise can be obtained by lowering the rotation speed of the blower motor.

[0003] If the air supply is not properly adjusted, incomplete combustion produces soot and the temperature of the combustion gas decreases. In the case of adjusting the air supply amount by the damper, the air supply amount can be easily detected by detecting the opening degree of the damper. Could not be detected, and combustion sometimes continued with the air supply amount shifted.

[0004]

SUMMARY OF THE INVENTION A problem to be solved by the present invention is to detect whether or not the air supply amount is adjusted accurately in a boiler in which the air supply amount is adjusted by an inverter device. Detects abnormalities when they occur,
The purpose is to prevent incomplete combustion from continuing.

[0005]

An inverter device in which a high combustion frequency and a low combustion frequency are set is connected to a blower motor, and the frequency of a current sent to the blower motor by the inverter device is changed. In a boiler in which combustion control is performed in three positions of high combustion, low combustion, and stop by controlling the amount of fuel supplied to the boiler by changing the rotation speed of the A frequency detection device that detects the operating frequency sent to the blower motor by setting the operation confirmation frequency between the high combustion frequency value and the low combustion frequency value, and detects the frequency when the frequency is changed by the inverter device. The operation frequency detected by the device is compared with the operation confirmation frequency, and if the changed operation frequency passes the operation confirmation frequency, It is determined to be normal operation of the over data device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of one embodiment of the present invention. The boiler 1 is provided with a combustion device 2 at an upper portion, and combustion is performed by fuel sent through a fuel supply pipe 3 and combustion air sent from a blower 6, and the combustion amount is controlled by the fuel supply amount and the air supply. This is done by adjusting the amount. The fuel supply amount is controlled by a first solenoid valve 4 and a second solenoid valve 5 provided in the middle of the fuel supply pipe 3, and when the first solenoid valve 4 and the second solenoid valve 5 are closed, the fuel supply is stopped. When only the first solenoid valve 4 is opened, low combustion occurs, and the first solenoid valve 4 and the second
When the solenoid valve 5 is opened, high combustion occurs. An inverter device 8 is connected to the blower motor 7, and the inverter device 8
The rotation speed of the blower motor 7 is changed according to the operation frequency output from the inverter, and the operation frequency output from the inverter device 8 is detected by the frequency detection device 11. A damper 9 is provided in an air path connecting the blower 6 and the boiler 1, and the opening degree of the damper 9 is set to fully open, open for ignition, and fully closed. Combustion control such as opening and closing of the first solenoid valve 4 and the second solenoid valve 5 and adjustment of the air supply amount by the inverter device 8 or the damper 9 are performed by the combustion device 2, the first solenoid valve 4, the second
The operation is performed by a control device 10 connected to the solenoid valve 5, the inverter device 8, the damper 9, and the frequency detection device 11 and having a timer device 12 therein. In the inverter device 8, values of the respective frequencies of purge frequency> high combustion frequency> operation confirmation frequency> low combustion frequency are set in advance.

FIG. 2 is a time chart showing the state of the combustion and the adjustment of the air supply amount in one embodiment of the present invention, and shows the control performed by the controller 10. When the operation switch of the stopped boiler is turned on, the control device 10
Fully open the damper 9 to perform the pre-purge,
A purge frequency (for example, 60 Hz) is provided for the inverter device 8.
Is sent from the inverter device 8 to the blower motor 7
The operating frequency sent to is set as the purge frequency. During the prepurge, the amount of air sent from the blower to the boiler is set to a maximum. When the prepurge is completed, the opening of the damper 9 is changed to the ignition opening, and the amount of air supply is reduced by the damper 9. A spark is generated by applying a voltage to the ignition transformer with the air supply amount restricted by the damper, and the first solenoid valve 4 is opened to ignite with low combustion.

When a set time (for example, 10 seconds) elapses from the ignition, the control device 10 inputs a command for a low combustion frequency (for example, 23 Hz) to the inverter device 8, and outputs the command to the blower motor 7 in the inverter device 8. The operation frequency is shifted from the purge frequency to the low combustion frequency. The operation of the timer device 12 is started when the operation frequency shift command is output, and the elapsed time from the frequency shift command is detected. The frequency detecting device 11 detects the operating frequency output from the inverter device 8, and outputs the fact to the control device 10 when the operating frequency passes the operation confirmation frequency. If the operating frequency passes the operation confirmation frequency before the elapsed time from the frequency shift command to the inverter device 8 reaches the preset time, it is determined that the inverter device 8 is operating normally. If the frequency does not pass through the operation confirmation frequency even after the set time or more, it is determined that there is an abnormality, and an abnormality is output. The adjustment of the air supply amount by the damper 9 is performed only at the time of ignition, and the adjustment of the air supply amount thereafter is performed by adjusting the rotation speed of the blower motor 7 by the inverter device 8, and the opening degree of the damper 9 is fixed by shifting to the fully open state. Keep it.

The same applies to the case where the combustion amount is switched from low combustion to high combustion or the case where the combustion amount is switched from high combustion to low combustion.
When the operation frequency change command is input to the
2, the detection of the elapsed time is started, and if the operating frequency passes the operation confirmation frequency before the elapsed time reaches the set time, it is determined that the inverter device 8 is operating normally. If the frequency does not pass the operation confirmation frequency, it is determined that an abnormality has occurred, and an abnormality is output.

[0010]

By implementing the present invention, it is possible to detect whether or not the air supply amount adjustment of the boiler for performing the air supply amount adjustment by the inverter device is accurately performed, and to accurately perform the air supply amount adjustment. Is not performed, an abnormality can be detected and incomplete combustion can be prevented from continuing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a time chart of one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 boiler 2 combustion device 3 fuel supply pipe 4 first solenoid valve 5 second solenoid valve 6 blower 7 blower motor 8 inverter device 9 damper 10 control device 11 frequency detection device 12 timer device

Claims (1)

[Claims] 1. An inverter device in which a high combustion frequency and a low combustion frequency are set is connected to a blower motor,
The air supply amount is adjusted by changing the rotation speed of the blower motor by the inverter device, and the combustion control is performed at three positions of high combustion, low combustion, and stop by controlling the fuel supply amount to the boiler. In the boiler, a frequency detecting device for detecting an operation frequency sent to the blower motor by the inverter device is provided, and an operation confirmation frequency is set between the high combustion frequency value and the low combustion frequency value, and the frequency by the inverter device is set. At the time of change, the operation frequency detected by the frequency detection device is compared with the operation confirmation frequency, and if the changed operation frequency does not pass the operation confirmation frequency, the inverter device is determined to be abnormal. A method for confirming the operation of an inverter device.