JP3056968B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a water heater or a fan heater provided with a burner, and more particularly to a fuel supply amount for changing and adjusting a fuel supply amount to a burner based on control information. Adjusting means, target combustion amount command means for commanding the target combustion amount of the burner, and control information for setting the combustion amount of the burner to the target combustion amount based on command information of the target combustion amount command means. And a combustion control means for outputting to the fuel supply amount adjusting means.

[0002]

2. Description of the Related Art In the above-described combustion apparatus, conventionally, for example, a pulse signal whose duty ratio has been changed in accordance with a required combustion amount is output as control information from the combustion control means, and the control signal is used as the fuel supply amount adjustment means. For example, an electromagnetic proportional valve whose fuel opening is changed and adjusted proportionally according to the amount of current supplied, a drive circuit that drives the electromagnetic proportional valve with a required amount of current based on the pulse signal, and the like are used. Had been.

However, in such a configuration, while the fuel supply amount is properly adjusted during normal operation, for example, if the fuel supply amount adjusting means fails, an appropriate burner combustion can be performed. Control of the quantity may not be possible.

Therefore, conventionally, when the deviation between the output temperature (for example, the tapping temperature after being heated by the burner in a hot water supply device) due to the combustion operation of the burner and the target temperature becomes larger than a set amount, the operation is abnormal. Was configured to be determined.

[0005]

In the above-described conventional configuration, when the above-described operation abnormality occurs, it is determined that the operation is abnormal only after the combustion operation by the burner is executed. Therefore, there is a disadvantage that the combustion operation of the burner is mistakenly started even though the operation abnormality has occurred, and there is a disadvantage that the output temperature may be different from the target temperature. There was room for

The present invention has been made in view of such a point, and an object of the present invention is to make it possible to detect as soon as possible when an abnormality has occurred in the fuel supply amount adjusting means. Another aspect of the present invention is to provide a combustion apparatus.

[0007]

According to a first aspect of the present invention, there is provided: (A) a fuel supply amount adjusting means for changing and adjusting a fuel supply amount to a burner based on control information; and a target combustion amount of the burner. Target combustion amount commanding means for instructing, and control information for setting the combustion amount of the burner to the target combustion amount based on the command information of the target combustion amount commanding means, and outputting the control information to the fuel supply amount adjusting means. (B) actual operation information detecting means for detecting actual adjustment operation information in the fuel supply amount adjusting means, and a target instructed by the target combustion amount instructing means. Storage means for previously storing appropriate operation information in the fuel supply amount adjusting means corresponding to the combustion amount, and before the fuel supply amount adjusting means is provided.
Opening the fuel supply passage to the burner;
A supply path opening / closing means that can be changed to a state in which the supply path is cut off ; and (C) the fuel supply amount adjustment means changes and regulates a fuel supply amount to the burner based on a supplied current value. It is configured to include an electric adjustment operation unit and a current amount adjustment unit that adjusts a supply current to the adjustment operation unit based on the control information, and the actual operation information detection unit includes, as the adjustment operation information, The storage means is configured to detect an actual supply current supplied to the adjustment operation means, and the storage means corresponds to the target combustion amount commanded by the target combustion amount command means as the proper operation information. (D) the combustion control means, based on a combustion start command,
Outputting the control information to the fuel supply amount adjusting means.
The adjustment detected by the actual operation information detecting means.
Operation information and proper operation stored in the storage means
Based on the information, the fuel supply amount adjusting means is abnormal.
And (E) determining that the fuel supply amount adjusting means is not abnormal.
Then, when the supply path opening / closing means is set to the open state,
In both cases, an ignition system for operating ignition means for the burner is provided.
And the fuel supply amount control is performed.
If it is determined that the regulating means is abnormal,
Means for maintaining said shut-off state and said ignition control
In that it is configured not to perform

[0008]

A characteristic configuration of the second invention specifies a configuration suitable for implementing the first invention, wherein the burner is provided with water.
Configured to heat a heat exchanger for heating; and
Set target temperature for hot water temperature after heating by heat exchanger
Hot water temperature setting means for controlling the target combustion amount command means
Is configured to instruct the target combustion amount based on the target temperature .

[0010]

[0011]

[0012]

[0013]

According to the first aspect of the invention, the following operation is provided.
There is . That is, since the configuration described in the above (A) and (B) is provided, control information for setting the burner combustion amount to the target combustion amount commanded by the target combustion amount commander is sent to the fuel supply amount adjuster. The fuel supply amount adjusting means changes and adjusts the fuel supply amount to the burner. Then, actual adjustment operation information in the fuel supply amount adjustment unit is detected by the actual operation information detection unit. In addition, proper operation information corresponding to the commanded target combustion amount when the fuel supply amount adjusting means is operating properly is stored in the storage means in advance. Then, based on the actual adjustment operation information detected by the actual operation information detection means and the proper operation information stored in the storage means, for example, a determination is made as to whether or not the deviation exceeds a set amount. Thus, it is determined whether or not the fuel supply amount adjusting means is abnormal. And since it has the structure described in said (C) , (D), and (E) , in addition to the effect by the structure described in said (A) and (B), there exists the following effect | action. Based on the control information, the supply current to the adjustment operation means is adjusted by the current amount adjustment means, and the fuel supply amount to the burner is changed and adjusted by the electric adjustment operation means based on the supplied current value. Then, based on the combustion start command,
Output the control information to the fuel supply amount adjusting means.
At the same time, it is determined whether or not the fuel supply amount adjustment means is abnormal based on the actual supply current detected by the actual operation information detection means and the proper supply current stored in the storage means in advance. In other words, after the combustion start command,
Whether the fuel supply amount adjustment means is abnormal in a low state
Is determined at an appropriate timing. Also supply
Road opening / closing means is provided, and as described in (E) above,
Of the fuel supply amount adjustment means
If it is determined that there is no
Ignition that activates the ignition means for the burner
Execute the control and confirm that the fuel supply amount adjustment means is abnormal.
If it is determined, regardless of the combustion start command,
Keep the stage closed and do not use ignition control
It is.

[0014]

According to the characteristic configuration of the second invention, the following operation is provided in addition to the operation of the characteristic configuration of the first invention. Heat exchanger
Based on target hot water temperature for hot water temperature after being heated by
Command the target combustion rate of the burner that heats the heat exchanger.
Control information for achieving the commanded target combustion amount
This is output to the fuel supply amount adjusting means.

[0016]

[0017]

[0018]

Therefore, if the fuel supply amount adjusting means is abnormal, the hot water temperature after being heated by the heat exchanger may be different from the target hot water temperature. Is determined based on the operation information of the fuel supply amount adjusting means, so that it is determined as soon as possible whether or not there is an abnormality as soon as possible in comparison with the case where the determination is based on the detection information of the tapping temperature. Become.

[0020]

According to the characteristic structure of the first invention, the following effects can be obtained . Since the configuration described in the above (A) and (B) is provided, after the fuel supply amount adjusting means is operated to be adjusted, the operation information of the fuel supply amount adjusting means itself and the proper operation information stored in advance are stored. Since the determination is performed based on the output (temperature or the like) due to the combustion operation of the burner, for example, it is determined whether or not the fuel supply amount adjustment means is abnormal with a time delay as small as possible as compared with the configuration in which the abnormality is determined. Can be determined. And (C) above ,
Since the configuration described in (D) and (E) is provided, in addition to the effects of the configurations described in (A) and (B),
The following effects are obtained . For example, an abnormality is determined by comparing current values at which change control and detection operation can be relatively easily performed, as compared with a case where control is performed based on the number of rotations using a rotary actuator or the like. This configuration has the advantage that the control configuration can be simplified, and in this type of adjustment operation means, it is necessary to operate a mechanically movable part, so that general control Although a relatively large current is supplied than the current, by providing the current amount adjusting means for adjusting the supplied current, the control information output to the current amount adjusting means can be a small power signal or the like. Information, and there is an advantage that the entire configuration can be simplified. Also, the combustion start command
Later, with a small time delay, the fuel supply
Is determined at an appropriate time.
Executing post-processing at the appropriate timing when an error occurs
The fuel supply amount adjustment means is abnormal.
The burner burn time is set to zero by mistake
Alternatively, it can be reduced to a minimum
After it is determined that the supply amount adjusting means is abnormal, the fuel
Fuel supply in a state where the adjustment control of the fuel supply amount adjustment means is impossible.
The disadvantage of continued use can be avoided beforehand, and
Integrity can be ensured. Furthermore, the fuel supply amount adjustment means is abnormal.
Is determined and the fuel supply amount is shut off.
It is possible to avoid the disadvantage of activating the ignition means unnecessarily.
You.

[0021]

According to the characteristic configuration of the second invention, the following effect is obtained in addition to the effect of the characteristic configuration of the first invention. Fuel supply
The tapping temperature may not be
Avoid avoiding a temperature different from the target temperature beforehand,
Alternatively, it can be eliminated as quickly as possible.

[0023]

[0024]

[0025]

[0026]

Embodiments will be described below with reference to the drawings. FIG.
2 shows a hot water supply device as an example of a combustion device. The hot water supply apparatus includes a hot water supply unit K, a control unit H for controlling the operation of the hot water supply unit K, and a remote control operation unit R for instructing hot water supply operation information.

The hot water supply unit K includes a gas burner 2 for burning supplied fuel gas, a heat exchanger 3 heated by the gas burner 2, and a fan 4 for passing combustion air through the gas burner 2 in the combustion chamber 1. A water inlet 5 to which water is supplied and a hot water outlet 6 for supplying heated hot water to a hot water tap (not shown) are connected to the heat exchanger 3. The water inlet channel 5 is provided with a water inlet temperature sensor 7 for detecting the water inlet temperature T _i and a water amount sensor 8 for detecting the water inlet amount Qx, and the water outlet channel 6 is provided with a water outlet temperature sensor 9 for detecting the water outlet temperature T _O. Is provided.

The fuel supply path 10 for the gas burner 2 is an electromagnetically operated type as a supply path opening / closing means that can be switched between a state in which the fuel supply path 10 is opened and a state in which the fuel supply path 10 is shielded based on the on / off of current supply. An on-off valve 11 and an electromagnetic proportional valve 12 as an electric adjusting operation means for changing and adjusting the opening degree of the fuel supply passage 10, that is, the fuel supply amount to the gas burner 2 based on the supplied current value, are provided. ing.

In the vicinity of the gas burner 2, there are provided an igniter 13 as ignition means for igniting the gas burner 2 and a frame rod 14 for detecting that the gas burner 2 has been ignited.

The remote control operation unit R is configured to communicate various kinds of information to the control unit H by wire or wirelessly. A temperature setting switch 16 as a temperature setting means for setting a target hot water supply temperature, a temperature display section 17 for displaying hot water supply temperature and the like, an operation display lamp 18 which is turned on when the operation is in progress, and an abnormality display which is turned on when an abnormal state occurs It comprises a lamp 19 and the like.

In the steady combustion state, the control unit H commands the target combustion amount of the gas burner 2 based on the target hot water supply temperature Ts set by the temperature setting switch 16, and sets the initial combustion state immediately after the hot water supply operation command. In the above, control information for setting the combustion amount of the gas burner 2 to the target combustion amount based on a target combustion amount instruction means 100 for instructing a target combustion amount for ignition and a hot water supply start instruction (corresponding to a combustion start instruction). Combustion control means for performing the ignition operation by the igniter 13 and controlling the rotation speed of the fan 4 so that the combustion amount of the gas burner 2 becomes a fan rotation speed determined based on a preset characteristic. 10
1, a current amount adjusting means 102 for adjusting a supply current to the electromagnetic proportional valve 12 based on the control information outputted from the combustion control means 101, and an actual supply current actually supplied to the electromagnetic proportional valve 12. Value (example of adjustment operation information)
And an actual current detecting means 103 for detecting the current.

FIG. 2 is a circuit block diagram of the control section H. The target combustion amount command means 100 and the combustion control means 1 are shown in FIG.
01 is provided in the form of a control program in the control device 20 equipped with a microcomputer, and the current amount adjusting means 102 controls the supply current to the electromagnetic proportional valve 12 which is a large current compared to the output value from the control device 20. And a drive circuit 21 for controlling a current flowing through the switching transistor TR for current control based on a control signal (control information) from the control device 20. Therefore, the current amount adjusting means 102 and the electromagnetic proportional valve 12 constitute a fuel supply amount adjusting means A for changing and adjusting the fuel supply amount to the gas burner 2.

The control device 20 constituting the combustion control means 101 adjusts the opening of the electromagnetic proportional valve 12 based on the target combustion amount so that the combustion amount of the gas burner 2 becomes the target combustion amount. It is configured to output control information to the drive circuit 21. Specifically, a pulse signal in which the duty ratio (the ratio of the pulse width to the pulse period) is changed by pulse width modulation according to the target combustion amount is output as control information. Then, the drive circuit 21 adjusts the current amount so that the peak current Ip (the maximum value of the pulse current) of the switching transistor TR is maintained at the set value, and based on the input pulse signal, the duty ratio of the output current. (Pulse width t _{1 with} respect to pulse period t ₀
(See FIG. 4) to change and adjust the output current of the switching transistor TR (supply current to the electromagnetic proportional valve 12).

The actual current detecting means 103 is provided with the electromagnetic proportional valve 12
22 provided in series with the current supply path to
And a current detection circuit 2 for detecting a supply current value to the electromagnetic proportional valve 12 based on a voltage value between both ends of the resistor 22.
3 is comprised. The current detection circuit 23 is configured to convert the voltage value (pulse output) at both ends of the resistor 22 into a DC voltage and then input the DC voltage to the control device 20. The control device 20 is provided with an A / D converter 24 for converting analog data into digital data for performing control processing, and converts a DC voltage (analog value) input from the current detection circuit 23 into a digital signal. So that the signal processing is performed.

In FIG. 2, a diode 25 connected in parallel to the electromagnetic proportional valve 12 absorbs the back electromotive force generated when the current to the electromagnetic proportional valve 12 (specifically, the coil) is turned off. It is for. Further, since the power supply for the electromagnetic proportional valve 12 and the drive circuit 21 requires a large amount of power, a high power supply voltage (for example, 12 V) is supplied, and the voltage conversion circuit 26 supplies a low voltage (for example, 5 V) to the control device 20. ), The power is supplied.

The control unit H previously supplies an appropriate supply current to the electromagnetic proportional valve 12 corresponding to the target combustion amount for ignition when the drive circuit 21 and the current control switching transistor TR are operating normally. A memory Me is provided as storage means for storing. This memory Me
It is composed of a nonvolatile memory such as an EEPROM. Therefore, even if the power is turned off due to, for example, a power failure or the like, the memory Me is configured so that the stored contents are not erased.

The control device 20 is configured to execute the control of the combustion amount and the fan speed as described above, and is configured as follows. That is, control information for adjusting the opening of the electromagnetic proportional valve 12 is output to the current amount adjusting means 102 based on the target combustion amount so that the combustion amount of the gas burner 2 becomes the target combustion amount. Have been. Specifically, a pulse signal whose duty ratio is changed by pulse width modulation according to the target combustion amount is output as control information. Also, based on the information detected by the actual current detecting means 103 and the information stored in the memory Me, it is determined whether or not the driving circuit 21, the switching transistor TR for current control, or the electromagnetic proportional valve 12 is in an abnormal state in which it does not operate normally. Is determined.

Next, the control operation of the control device 20 constituting the combustion control means 101 and the target combustion amount command means 100 will be described with reference to the flowchart of FIG. When it is determined that the hot water tap has been opened by determining that the detection value of the water amount sensor 8 has exceeded the set water amount, prepurge is started (steps 1 and 2). That is, the operation of the fan 4 is started, and the fan rotation speed is controlled so that the amount of ventilation air for ignition is obtained. And gas burner 2
A pulse signal having a duty ratio set so that the combustion amount of the target becomes the target combustion amount for ignition is output to the drive circuit 21 in the current amount adjusting means (step 3). When this pulse signal is output, the switching transistor TR is driven by the drive circuit 21, and the supply current to the electromagnetic proportional valve 12 is adjusted to a current amount corresponding to the target combustion amount for ignition. Then, the detected current value Ix actually supplied to the electromagnetic proportional valve 12 and detected by the current detection circuit 23 is read (step 4).

The stored value I previously stored in the memory Me
s (an appropriate current amount corresponding to the target combustion amount for ignition) is read, and if the absolute value of the difference between the stored value Is and the detected current value Ix is not equal to or greater than the set amount α, it is determined that the device is operating normally. A determination is made (steps 5 and 6), the on-off valve 11 is opened, the igniter 13 is ignited, and the gas burner 2 is opened.
(Steps 7 and 8). Frame rod 14
When the ignition of the gas burner 2 is confirmed, the ignition by the igniter 13 is terminated (step 9).

After the gas burner 2 is ignited, the target hot water supply temperature Ts set by the temperature setting switch 16, the detected value Ti of the incoming water temperature sensor 7, and the detected value T of the outgoing water temperature sensor 9 are set.
o, the gas burner 2 based on the detection value of the water amount sensor 8, etc.
Is calculated (step 10), and a pulse signal having a duty ratio set is output to the drive circuit 21 in the current amount adjusting means so that the combustion amount of the gas burner 2 becomes the calculated target combustion amount. (Step 11)
The fan 4 is controlled so as to have a fan rotation speed corresponding to the combustion amount of the gas burner 2 (step 12), and until the hot water tap is closed and the detection value Qx of the water amount sensor 8 falls below the set water amount Qs, the gas burner 2 is controlled. Is controlled to maintain the optimum combustion state.

When the value detected by the water amount sensor 8 falls below the set water amount, the on-off valve 11 and the electromagnetic proportional valve 12 are closed to stop the combustion of the gas burner 2 (steps 13 and 14), and the combustion of the gas burner 2 is stopped. After that, post-purge is executed to execute the ventilation operation by the fan 4 for the set time (step 15).

Then, in step 6, the stored value Is
If the absolute value of the deviation between the current and the detected current value Ix is equal to or greater than the set amount α, the drive circuit 21 is abnormal and the switching transistor TR is not normally driven, or It is determined that the control is not possible or that the electromagnetic proportional valve 12 is in an abnormal state such as a short circuit failure or a disconnection failure,
The abnormality indicator lamp 19 is turned on to notify that an abnormality has occurred (step 16), and the abnormality display state is displayed until a reset operation such as turning on / off the power for maintenance work is executed. Maintain (Step 1
7). In this abnormal display state, the ignition operation to the gas burner 2 is prohibited, and the control is continued so that the on-off valve 11 is kept closed.

[Another Embodiment] (1) In the above embodiment, if the absolute value of the deviation between the stored value Is and the detected current value Ix is equal to or greater than a set amount α, it is determined that an abnormality has occurred. However, if the detected current value Ix is larger than the stored value Is and if the deviation between the detected current value Ix and the stored value Is is equal to or larger than a set amount, it is determined that the current value is abnormal. It may be something.

[0044]

[0045]

(2) In the above-described embodiment, the case of a hot water supply device is described as an example of a combustion device. However, the present invention is not limited to a hot water supply device, but may be a heating device or the like that adjusts indoor temperature by combustion of a gas burner 2. Applicable.

(3) In the above embodiment, the case of the gas burner 2 using fuel gas as the fuel has been exemplified, but a heavy oil burner or a burner for burning other fuels may be used.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater.

FIG. 2 is a circuit block diagram of a control unit.

FIG. 3 is a flowchart of a control operation.

FIG. 4 is a diagram showing a supply current;

[Explanation of symbols]

 2 Burner 3 Heat exchanger 11 Supply path opening / closing means 12 Adjustment operating means 13 Ignition means 16 Hot water temperature setting means 100 Target combustion amount command means 101 Combustion control means 102 Current amount adjustment means 103 Actual operation information detection means A Fuel supply amount adjustment means Me storage means

Continuation of front page (72) Inventor Yuji Takagi 1-1-52 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Herman Co., Ltd. (56) References JP-A-58-43327 (JP, A) JP-A-60-263016 (JP, A) JP-A-62-9148 (JP, A) JP-A-8-261454 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/24 101 F23N5 / 02 350

Claims (2)

(57) [Claims] 1. A fuel supply amount adjusting means for changing and adjusting a fuel supply amount to a burner based on control information; a target combustion amount command means for instructing a target combustion amount of the burner; A combustion control unit that outputs control information for setting the combustion amount of the burner to the target combustion amount to the fuel supply amount adjustment unit based on the command information. Actual operation information detection means for detecting actual adjustment operation information in the fuel supply amount adjustment means; and appropriate operation information in the fuel supply amount adjustment means corresponding to the target combustion amount instructed by the target combustion amount instruction means. Storage means for storing, and fuel for the burner provided with the fuel supply amount adjusting means.
Opening the fuel supply path and shutting off the fuel supply path
And a supply path opening / closing means that can be changed to a state.The fuel supply amount adjustment means is an electric adjustment operation means for changing and adjusting a fuel supply amount to a burner based on a supplied current value. A current amount adjusting unit configured to adjust a supply current to the adjusting operation unit based on the control information, wherein the actual operation information detecting unit includes, as the adjustment operation information,
The storage means is configured to detect an actual supply current supplied to the adjustment operation means, and the storage means corresponds to the target combustion amount commanded by the target combustion amount command means as the proper operation information. The combustion control unit is configured to store a proper supply current to the fuel supply amount adjusting unit based on a combustion start command.
And outputting the actual operation information.
The adjustment operation information detected by
Based on the proper operation information stored and stored
It is configured to determine whether the supply amount adjusting means is abnormal.
Made, to determine that the fuel supply amount adjusting means is not abnormal
And setting the supply path opening / closing means to the open state.
And ignition control for operating ignition means for the burner.
And adjusting the fuel supply amount.
If means determines that it is an abnormal, said supply channel opening and closing the hand
While maintaining the stage in the shut-off state, the ignition control
A combustion device that is configured not to perform. 2. The burner further includes a heat exchanger for heating water.
Configured to heat and heating by the heat exchanger
Hot water temperature setting means for setting the target temperature for the hot water temperature after
The target combustion amount instructing means is configured to determine a target combustion amount based on the target temperature.
2. The system according to claim 1, wherein the target combustion amount is commanded.
A combustion device as described.