JP2002267160A - Air supply state recognizing method and combustion controller using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air supply state recognizing method and a combustion controller using this method in which an air supply state is assuredly detected and a combustion control is carried out by a fail-safe circuit. SOLUTION: In the method for recognizing the air supply state of an air supply means 15 for supplying air, the flow of air supplied by the air supplying means 15 is used to generate electric power and the operation of the air supplying means 15 is recognized by the generated electric power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for checking the state of air blown by air blowing means used for air conditioners, heat equipment, and the like, and to a combustion control device for controlling fuel supply and air supply for combustion.

[0002]

2. Description of the Related Art Generally, in controlling various devices such as an air conditioner and a heat device, a method of confirming a blowing state of a blowing unit for supplying air to be used is to detect a pressure of air supplied by the blowing unit. For example, a so-called wind pressure switch or a flow rate sensor for detecting a flow rate is used. In these devices and the like, signals from the wind pressure switch and the flow rate sensor are transmitted to a controller such as a microcomputer, and the controller controls each controlled means constituting the device. However, when the wind pressure switch or the flow sensor itself fails, control may not be performed or an incorrect signal may be output. That is, when the air blowing state is abnormal, there is a possibility that a stop command is not output reliably. Further, when the air blowing state is normal, a stop command may be output.

[0003] For example, the above-mentioned wind pressure switch is used in a combustion control device for controlling a fuel control means for controlling the supply of fuel and a blowing means for supplying air for combustion.
When the fuel control means is controlled by the signal of the wind pressure switch, if the wrong signal is output, only the fuel may be supplied, which is dangerous. That is, a circuit and a control method which are not a so-called fail-safe circuit in the case of a failure or abnormality and which are controlled to a safe side.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for confirming a blast state in which a blast state is reliably detected and a combustion control is performed as a fail-safe circuit, and a combustion control apparatus using the method. It is to be.

[0005]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is a method for checking a blowing state of a blowing means for supplying air. It is characterized in that power is generated using the flow of air supplied by the blowing means, and the operation of the blowing means is confirmed with the generated power.

According to a second aspect of the present invention, there is provided a combustion control device for controlling a fuel control means for controlling the supply of fuel and a blowing means for supplying air for combustion, wherein a flow of air supplied by the blowing means is provided. And a detection circuit for confirming the operation of the blowing means with the power generated by the power generating means.

Further, according to a third aspect of the present invention, there is provided a combustion control device for controlling a fuel control means for controlling the supply of fuel and a blowing means for supplying air for combustion, wherein the air supplied by the blowing means is provided. And a drive circuit for driving the fuel control means with the power generated by the power generation means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described. The present invention can be suitably implemented in a method for confirming a blowing state of a blowing means for supplying air.

First, an embodiment of a method for confirming a blowing state according to the present invention will be described. A blower will be described as an example of a blower to which the present invention is applied. A generator is provided in an air duct connected to the blower to generate power using a flow of air supplied by the blower. Then, the generated power value is measured by the controller, and if the measured value is equal to or more than a predetermined value, the controller determines that the blower is operating normally. If the measured value is less than the predetermined value, the controller determines that the blower is abnormal. That is, if the blower is operating normally, it is determined that the operation of the blower is normal because there is sufficient power generated by the generator. If the blower is stopped or malfunctioning and running abnormally, it is determined that the operation of the blower is abnormal because there is no or insufficient power generated by this generator.

Here, if the generator itself is out of order, no power is generated by the generator, that is, there is no failure pattern on the power generation side, and the blower is inevitably abnormal. Is output, and the output to the safe side is performed. That is, this is a method for checking the air blowing state provided with the fail-safe circuit. Therefore, when the blower is abnormal, it is possible to reliably detect the abnormality of the blow state.

The generator may be provided in the air duct, or may be provided in a flow path branched from the air duct.

Next, the present invention can be suitably implemented in a combustion control device for controlling a fuel control means for controlling the supply of fuel and a blowing means for supplying air for combustion.

First, a first embodiment when applied to the combustion control device will be described. The combustion control device includes fuel control means for controlling fuel supply, for example, an electromagnetic valve,
A blower for supplying air for combustion, for example, a blower is provided. The combustion control device that controls these components includes a generator that generates electric power by using a flow of air supplied by the blower, a detection circuit that confirms the operation of the blower with the electric power generated by the generator, and a control circuit. And a container. The signal from this detection circuit is
That is, a failure signal is output as an interlock signal to a control circuit in the controller, and an AND circuit (a circuit connected in series) between the interlock signal and the solenoid valve opening command signal output from the controller is output as a failure. Constructs a safe circuit.

Also in this case, even if the generator itself fails, there is no failure pattern on the side that generates electric power, so that output is necessarily performed on the safe side. That is, a fail-safe circuit in which the solenoid valve does not operate unless both the interlock signal and the open command signal are turned on is configured. The fail-safe circuit surely controls the solenoid valve to a safe side. Here, the two signals may be contact signals or contactless signals on an electronic circuit.

Next, a second embodiment applied to the combustion control device will be described. The combustion control device,
A fuel control unit for controlling the supply of fuel, for example, an electromagnetic valve, and a blowing unit for supplying air for combustion, for example, a blower are provided. The combustion control device includes a controller and a generator that generates power using the flow of air supplied by the blower, and directly drives the solenoid valve using the power generated by the generator. That is, a drive circuit is configured to drive the solenoid valve with the power generated by the generator, instead of driving the solenoid valve with the power of the power supply supplied to the controller.

In this case as well, even if the generator itself fails, there is no failure pattern on the side that generates electric power, so the output is necessarily performed on the safe side. A fail-safe circuit is configured by adding an open command signal for the solenoid valve output from the controller to the drive circuit. That is, power generation in the drive circuit (signal that the blower is operating normally)
And unless both the open command signal is turned on,
This constitutes a fail-safe circuit in which the solenoid valve does not operate. The fail-safe circuit surely controls the solenoid valve to a safe side.

Therefore, when the blower is abnormal, it is possible to reliably detect the abnormality of the blower state and perform the combustion control using the fail-safe circuit as the combustion control.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the drawings, in which the present invention is applied to a method for checking a blowing state of a heat appliance. A boiler will be described as an example of the thermal device.

First, a description will be given of an embodiment of a method for checking the state of air flow. FIG. 1 is a schematic diagram of a boiler 1 to which a method for checking a blowing state according to the present invention is applied. The boiler 1 is provided in a boiler can 2 holding water therein, a water level gauge box 3 for detecting a water level in the boiler can 2, and a water supply line 4 for supplying water to the boiler can 2. Water supply pump 5
And a burner 6 for heating water in the boiler can 2, a steam valve 7 for extracting steam, and a controller 8 for controlling operation. A check valve 9 is provided between the water supply pump 5 and the boiler can 2. Further, the boiler 1 is provided with a pressure switch 10 for controlling the steam pressure in the boiler can 2.

The burner 6 is an electromagnetic valve (hereinafter, referred to as a fuel control means 12) provided in a fuel supply line 11.
An electromagnetic valve 12) and a blowing means 15 (hereinafter, referred to as a "blower 15") rotated by an ignition transformer 13 and a motor 14. The burner 6 has a flame sensor 16 for detecting a flame. The air duct 17 connected to the blower 15 is provided with a generator (hereinafter, referred to as a “generator 18”) that is a power generation unit 18 that generates power by the flow of air.

The controller 8 is provided with the water level gauge box 3,
The pressure switch 10, the generator 18, the flame sensor 16, and safety interlocks (not shown)
And are connected by signal lines (symbols omitted). The controller 8 is configured to control the water supply pump 5, the electromagnetic valve 1
2. The ignition transformer 13 and the motor 14 are connected to each other by control signal lines (omitted by reference numerals). Further, the controller 8 includes a boiler data collection unit, a communication unit, a panel display unit, and an alarm unit (all not shown).

Next, the normal operation of the boiler 1 having such a configuration will be described. The boiler 1 heats and boiles the water supplied into the boiler can 2 by the water supply pump 5 by burning the fuel by the burner 6 to generate steam. The operation of the water supply pump 5 is controlled such that the water level in the boiler can 2 falls within a predetermined water level control width.

An operation switch (not shown), an output signal of a combustion command of the pressure switch 10, an output signal indicating that each interlock is safe, and a power value generated by the generator 18 are predetermined. After confirming that the signal is not less than the value, that is, confirming that the blower 15 is operating normally, the electromagnetic valve 12 is opened, the fuel is ignited by the ignition transformer 13, and the burner 6 starts burning. When the flame sensor 16 detects a flame due to the combustion of the burner 6, the combustion is continued to generate steam. The steam valve 7 supplies steam to a load device (not shown).

That is, the generator 18 is provided in the air duct 17 connected to the blower 15, and the generated power value is measured by the controller 8. The fan 8 determines that the blower 15 is operating normally. If the measured value is less than the predetermined value, the controller 8 determines that the blower 15 is abnormal. Thus, the operation of the blower 15 is confirmed with the electric power generated by the generator 18. If the generator 18 itself has failed, the generator 18 does not generate power, that is, there is no failure pattern on the side that generates power, and it is inevitable that the blower 15 is abnormal. Is output, and the output to the safe side is performed. That is, a method of checking the air blowing state including the fail-safe circuit can be provided.

Further, a specific embodiment of the present invention will be described in detail with reference to the drawings when applied to a combustion control device for a heat appliance. A boiler will be described as an example of the heat equipment. First, a description will be given of a first embodiment of a combustion control device using the method for checking the state of air flow according to the present invention. In the first embodiment, the boiler 1 described with reference to FIG.
Will be described as an example, and the control circuit (reference numerals omitted) of the controller 8 will be described in detail. FIG. 2 is a schematic diagram of a control circuit of the controller 8. In the description of the devices in FIG. 2, the same devices as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, both power receiving terminals (symbols omitted) of the controller 8 are connected to a power supply line 20 and a ground line 21 of a power supply 19, respectively. The controller 8
, A first relay coil 22 for controlling power supply to the motor 14, a second relay coil 23 for controlling power supply to the ignition transformer 13, and a third relay coil for controlling power supply to the solenoid valve 12. 24 are provided. The first relay coil 22 has a first relay contact 25 that closes when activated, the second relay coil 23 has a second relay contact 26 that closes when activated, and the third relay coil 24 Has a third relay contact 27 that closes when activated.

Next, the detection circuit 28 for detecting the power generated by the generator 18 includes a fourth relay coil 29 that operates with the detected power. The fourth relay coil 29 is connected to the first power generation line 30 and the second earth line 3.
1 is connected to the generator 18. The fourth relay coil 29 is configured to close the fourth relay contact 3 when the fourth relay coil 29 is operated.
2 is provided.

The controller 8 and the detection circuit 28
The connection relationship on the circuit with will be described. The power supply line 20 is connected to one end of each of the relay contacts 25, 26, 27. The earth line 21
The motor 14, the ignition transformer 13, and the solenoid valve 12, which are controlled devices, are respectively connected to electrical connection terminals (reference numerals are omitted). The other end of the first relay contact 25 is connected to the other end (symbol omitted) of the electric connection terminal of the motor 14 by a connection line (symbol omitted). The other end of the second relay contact 26 is connected to the other end (symbol omitted) of the electrical connection terminal of the ignition transformer 13 by a connection line (symbol omitted). The other end of the third relay contact 27 is connected to one end of the fourth relay contact 32 by a connection line (omitted by a reference numeral).
The other end of 2 is connected to the other end of the electrical connection terminal of the solenoid valve 12 (not shown) by a connection line (not shown).

The operation of the control circuit thus configured will be described. If electricity is supplied from the power supply 19 to the controller 8 and the pressure in the boiler can 2 is less than a predetermined value by the pressure switch 10, after checking the water level, the first relay coil 22 is turned on. , The first relay contact 2
5 closes and the motor 14 rotates. Then, combustion air is supplied to the air duct 17 by the blower 15, and electric power is generated by the generator 18. Then, the fourth relay coil 29 is turned on, and the fourth relay contact 32 is closed. Next, the controller 8 turns on the second relay coil 23 and the third relay coil 24 simultaneously. When the second relay contact 26 is closed, the ignition transformer 13 operates to generate a spark from a spark rod (not shown). At the same time, the third relay contact 27 is also closed.
If the closed state of 2 is maintained, that is, if the blowing is normal, the solenoid valve 12 can be opened and the fuel can be sprayed. The fuel is ignited by the spark.

That is, a signal from the detection circuit 28 is output to the control circuit as a safety confirmation signal, that is, an airflow interlock signal, through the fourth relay contact 32, and the airflow interlock signal and the airflow interlock signal are output. Controller 8
The electromagnetic valve 12 is controlled as an AND circuit (a circuit connected in series) with an opening command signal of the electromagnetic valve 12 output from the third relay contact 27 through the third relay contact 27.

In this case as well, even if the generator 18 itself fails, there is no failure pattern on the side that generates electric power, so the output is necessarily performed on the safe side. In other words, a fail-safe circuit in which the electromagnetic valve 12 does not operate unless both the air interlock signal and the opening command signal are turned on. Further, the solenoid valve 12 can be reliably controlled to the safe side by the fail safe circuit.

Further, in the first embodiment, the motors which are the respective controlled devices are connected by connecting the relay contacts 25 and 26 and the third relay contact 27 and the fourth relay contact 32 in series. 14, the direct control of the ignition transformer 13 and the electromagnetic valve 12 has been described. However, when each of the controlled devices is a large device, each of the controlled devices is appropriately connected via an electromagnetic switch (not shown) or the like. Each controlled device may be controlled.

Next, a second embodiment will be described with reference to FIG. The second embodiment is a modification of the first embodiment. That is, the detection circuit 28 in the first embodiment is modified, and the electromagnetic valve 12 is directly driven by the generator 18. Also in the second embodiment, the boiler 1 described with reference to FIG. 1 and the generator 18 described with reference to FIG. 2 will be described as examples, and the same devices will be denoted by the same reference numerals and detailed description thereof will be omitted.

In FIG. 3, the controller 8 includes the relay coils 22, 23, and 24, and the relay coils 22, 23, and 24 respectively connect the relay contacts 25, 26, and 27, respectively. Have.

A drive circuit 33 for driving the solenoid valve 12 with the power generated by the generator 18 is provided. The drive circuit 33 is connected to one end of the electric connection terminal of the solenoid valve 12 via the third relay contact 27 connected to the first power generation line 30. Further, the second earth line 31 is connected to the other end of the electric connection terminal of the solenoid valve 12.

The power supply line 20 is connected to one ends of the relay contacts 25 and 26, respectively. The ground line 21 is connected to one end of each of the electric connection terminals of the motor 14 and the ignition transformer 13 (reference numerals are omitted).
And are connected respectively. The other end of the first relay contact 25 is connected to the other end (symbol omitted) of the electric connection terminal of the motor 14 by a connection line (symbol omitted). The other end of the second relay contact 26 is connected to the other end (symbol omitted) of the electrical connection terminal of the ignition transformer 13 by a connection line (symbol omitted).

The operation of the control circuit thus configured will be described. If electricity is supplied from the power supply 19 to the controller 8 and the pressure in the boiler can 2 is less than a predetermined value by the pressure switch 10, after checking the water level, the first relay coil 22 is turned on. , The first relay contact 2
5 closes and the motor 14 rotates. Then, combustion air is supplied to the air duct 17 by the blower 15, and electric power is generated by the generator 18. However, in the drive circuit 33, since the third relay contact 27 is off, the electromagnetic valve 12 is on standby without opening. Next, the controller 8 turns on the second relay coil 23 and the third relay coil 24 simultaneously. When the second relay contact 26 is closed, the ignition transformer 13 operates to generate a spark from a spark rod (not shown). At the same time, the third relay contact 27 is also closed, so that when the generator 18 generates electricity, that is, when air blowing is normal, the solenoid valve 12 can be opened and fuel can be sprayed. The fuel is ignited by the spark.

That is, a safety confirmation signal, that is, an airflow interlock signal is directly output from the drive circuit 33 to the solenoid valve 12, and the airflow interlock signal and the controller 8 are transmitted through the third relay contact 27. Thus, the solenoid valve 12 is directly controlled as an AND circuit (circuit connected in series) with the output command signal for opening the solenoid valve 12.

Also in this case, even if the generator 18 itself fails, there is no failure pattern on the side that generates electric power, so that the output is necessarily performed on the safe side. That is, if both the power generation and the open command signal are not turned on,
This is a fail-safe circuit in which the solenoid valve 12 does not operate. Further, the solenoid valve 12 can be reliably controlled to the safe side by the fail safe circuit.

[0040]

According to the present invention, it is possible to provide a method for confirming an air blowing state by reliably detecting the air blowing state and making the combustion control a fail-safe circuit, and a combustion control apparatus using this method.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a boiler to which a method for checking a blowing state according to the present invention is applied.

FIG. 2 is a schematic diagram of a control circuit in a first embodiment of the controller of the combustion control device to which the present invention is applied.

FIG. 3 is a schematic diagram of a control circuit in a second embodiment of the controller of the combustion control device to which the present invention is applied.

[Explanation of symbols]

 12 solenoid valve (fuel control means) 15 blower (blower means) 18 generator (power generation means) 28 detection circuit 33 drive circuit

Claims (3)

[Claims] In a method for checking a blowing state of a blowing means for supplying air, power is generated by utilizing a flow of air supplied by the blowing means, and the generated power is used to operate the blowing means. A method for checking the state of air flow, comprising: 2. A fuel control means 12 for controlling the supply of fuel.
A combustion control device that controls the air supply means 15 for supplying air for combustion, and a power generation means 18 for generating electric power using a flow of air supplied by the air supply means 15,
The electric power generated by the power generation means 18 is used for the air blowing means 1.
5. A combustion control device comprising a detection circuit 28 for confirming operation of the combustion control device 5. 3. A fuel control means 12 for controlling the supply of fuel.
A combustion control device that controls the air supply means 15 for supplying air for combustion, and a power generation means 18 for generating electric power using a flow of air supplied by the air supply means 15,
A combustion control device, comprising: a driving circuit 33 for driving the fuel control means 12 with electric power generated by the power generation means 18.