JP2003130456A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ignition failure by setting the amount of gas and the amount of air at optimal values according to the components of gas at a location where an apparatus is installed. SOLUTION: The water heater includes: a water passage having a heat exchanger 3 provided between a water supply port and a hot water output port; a burner 9 for heating the heat exchanger 3; a fuel supply device for supplying fuel to the burner 9; a fan 8 for supplying the combustion air of the burner 9; an ignitor 11 for igniting the burner 9; an ignition detection device 12 for detecting the ignition of the burner; and a control part 10 for controlling the amount of fuel and the amount of air for the burner 9. During initial operation after installation of the apparatus, a controlled output value of the amount of fuel at the time of ignition of the burner 9 is automatically raised from a preset lower limit value until ignition of the burner 9 is detected. The controlled output value at the time of detection of the ignition is stored to learn an optimum value of the amount of ignition gas at the installation site to prevent ignition failure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device that burns gas to heat water to supply hot water.

[0002]

2. Description of the Related Art A conventional water heater of this type uses a fuel amount and an air amount at the time of ignition in each gas type due to variations in the combustion speed due to variations in the components of the gas species, variations in the Wobbe index, and the like. It is set within a narrow range where worst-case conditions of ignition transfer performance, explosion ignition, and abnormal ignition are overlapped. At each installation site, if ignition failure occurs during normal use in this setting specification, the appliance cannot be used because the burner does not catch fire and the error stops. The adjustment of the amount of gas and the amount of air required the work of a specialist to change the data of the control part of the instrument or to adjust the amount of control while performing measurement on site.

[0003]

However, in the above-mentioned conventional water heater, the gas amount and the air amount are determined by determining the range of the fire transfer performance at the time of ignition and the range of explosive ignition, etc. by the width of the variation of the components in each gas type. Since the values are set, the values are not optimal for the gas components at the actual installation location, and there is a problem that phenomena such as poor ignition and abnormal ignition tend to occur during actual use after installation. Was there.

Further, the set value is determined by a fixed value,
In the case of ignition failure, even if it ignites normally and it can be used as a water heater even if it burns normally, it will stop abnormally without igniting, so the amount of gas and air at ignition will be small. There is a problem that it is not suitable and the water heater cannot be used at all and is inconvenient to use.Also, even if there is a tendency for poor ignition due to aging etc., it is not known until ignition is no longer detected, There was a problem that the vessel could not be used.

[0005]

In order to solve the above problems, the present invention provides an output for ignition while automatically changing the control output value of the gas amount at the time of ignition after installing the appliance from a preset initial value. The value is obtained and the control output value of the amount of gas that normally ignites in the gas component at that site is learned. Also, if ignition failure occurs during use,
Raise the control output within the range that does not cause abnormal ignition up to the upper limit value of the control output to ignite the burner so that it can be used as much as possible as a water heater, and warn that there is a tendency for ignition failure. So that the equipment can be inspected before it suddenly becomes unusable. Further, the same effect is provided by changing the amount of air to be mixed instead of the amount of gas.

According to the above invention, the specification of the optimum ignition gas amount can be learned with respect to the gas component at the actual installation place, so that the occurrence of ignition failure can be suppressed. Further, even if the performance changes due to aged use or the like, the specification can be changed according to the state, so that normal ignition can be performed for a long time. In addition, by issuing a warning before suddenly stopping the error, it is possible to reduce the phenomenon that the water heater cannot be used due to poor ignition.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A water heater according to claim 1 of the present invention is a water passage provided with a heat exchanger between a water inlet and a hot water outlet, a burner for heating the heat exchanger, and a fuel for the burner. A fuel supply device that supplies the air, a fan that supplies the air necessary for combustion in the burner, an igniter that blows out a spark to ignite the burner, and an ignition detection device that detects ignition to the burner, It consists of a control unit that controls the fuel amount and air amount in the burner, and detects the ignition to the burner from the preset lower limit value of the control output value of the fuel amount when igniting the burner during the initial operation after installing the equipment. Up to automatically increase the temperature, and store the control output value when ignition is detected, to thereby learn the appropriate value of the ignition gas amount in the gas component or the like at the actual installation location. Then, the ignition operation is performed with an appropriate gas amount, and the explosion ignition reduction is prevented.

A water heater according to a second aspect of the present invention is a water passage provided with a heat exchanger between a water inlet and a hot water outlet, a burner for heating the heat exchanger, and a fuel for supplying fuel to the burner. A supply device, a fan that supplies air necessary for combustion in the burner, an igniter that blows out sparks to ignite the burner, and an ignition detection device that detects ignition to the burner,
It consists of a control unit that controls the amount of fuel and the amount of air in the burner,
In order to ignite the burner, increase the control output value of the fuel amount when igniting the burner by a fixed value when ignition is not detected during the predetermined ignition operation with the preset fuel amount output at ignition. Has a combustion amount control means. And it prevents operation stop due to poor ignition.

In the water heater according to claim 3 of the present invention, in the control state of the amount of fuel for igniting the burner, the determination means based on the control output value when ignition is detected, and the remote control display a warning indicating a tendency for poor ignition. Have means. And I try not to suddenly stop using the water heater.

A water heater according to a fourth aspect of the present invention counts and counts the number of times that ignition detection is not performed by a preset fuel amount output at the time of ignition in the control state of the fuel amount for igniting the burner. When the number exceeds the set threshold value, the remote controller has a means for displaying a warning indicating a tendency toward poor ignition. And, as described above, it is prevented that the water heater suddenly becomes unusable.

In the water heater according to claim 5 of the present invention, the control output value at the time of ignition detection is relearned as the gas amount control output value at ignition in the control state of the fuel amount for igniting the burner. It has means for controlling the ignition gas amount control output value that is suitable for the state of the appliance. Then, the ignition failure is prevented from occurring.

According to a sixth aspect of the present invention, there is provided a water heater having a fan rotation speed that determines not the control output value of the gas amount at the time of ignition but the air amount mixed with the gas. And a means for controlling the control output value of. It also makes it difficult for ignition failure to occur.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows Embodiment 1 of the present invention, in which hot water is absorbed from a water inlet through a water inlet thermistor 1 and a water amount sensor 2, and is absorbed by a heat exchanger 3 heated by a burner 9. Then, the water passes through the water amount control valve 4 and the hot water discharge thermistor 5, and is discharged from the hot water outlet. From the gas inlet, the gas is the original solenoid valve 6,
It passes through the gas proportional valve 7, is mixed with the air sent by the fan 8, and is burned by the burner 9. In the hot water supply operation, when the hot water tap is opened and the water amount sensor 2 detects the ignition water amount or more,
Whether the ignition operation has started, a predetermined fan output value and gas output value have been output from the control unit 10, and the igniter 11 has sparked and ignited the mixture sent to the burner 9 to ignite the burner. Is detected by the ignition detection device, and when ignition is detected, the amount of gas, the amount of air, and the amount of water are controlled based on the detection values from the respective sensors to supply hot water set by the remote controller.

Next, with reference to the flowchart of FIG.
The operation and action will be described. When the hot water tap is opened, it is determined in step 100 whether or not water is flowing over the amount of ignition water.
If more than the amount of ignition water is flowing, the ignition operation of step 101 is started. In step 102, it is determined whether or not there is a learned value of the control value of the gas amount at the time of ignition, and if there is a learned value, the process proceeds to step 103 and the learned value is output to perform the ignition operation.
When the control learning value of the gas amount does not exist in step 102, the process proceeds to step 104, and the lower limit value of the ignition gas amount control output set in advance in consideration of the variation of the gas component is output. In step 105, it is determined whether or not there is ignition detection of the burner, and if ignition is detected, the control output value of the gas amount at this time is stored as a learning value in step 106, and as a water heater, from the incoming water temperature, the set temperature, and the flow rate. The amount of combustion is calculated, and the process proceeds to hot water supply combustion control in step 106.

If ignition is not detected in step 105,
In step 108, the control output value of the ignition gas amount is increased by a constant value. In step 109, it is determined whether the control output value of the gas amount increased in step 108 is less than or equal to the upper limit of the control output value of the ignition gas amount, which is set so that abnormal ignition such as explosion ignition does not occur. Ignition detection determination of 105 is performed. If ignition is detected, steps 106 and 107
Then, the output value at that time is stored as a learning value.

If ignition is not detected, the routine proceeds to step 108 again, and the control output value of the gas amount is increased by a constant value.
If the ignition detection in step 105 is not detected, step 109
In step 108, until the ignition gas amount control output value exceeds the upper limit judgment, the gas amount control output value is increased by a fixed amount in step 108, and the output value at the time of ignition detection is stored as a learning value. When the gas amount control output value exceeds the upper limit value in step 109, ignition failure determination is performed in step 110, and error stop is performed in step 111. In the determination of the ignition detection in step 105, the time from the opening of the gas valve to the ignition detection is used as the determination reference to improve the accuracy, or a fixed value is added to the output value of the ignition detection to obtain the learning value. It may be possible to give a margin.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the flowchart of FIG. When the control output value of the gas amount at the time of ignition is already set, when the hot water tap is opened and the ignition water amount is detected to start the ignition operation, the set value of the ignition gas amount is output in step 112,
If the ignition detection is determined in step 113 and the ignition is detected, the hot water supply combustion control in step 114 is started. Originally, the output should be learned as an appropriate value, so ignition should be detected, but ignition may not be detected due to clogging of the gas passage. In that case, instead of immediately determining the ignition failure and making the appliance unusable, the output value of the ignition gas amount is increased by a predetermined value until the upper limit determination of step 116 is performed, The ignition detection judgment confirmation of step 119 is performed. Step 11
If ignition detection is detected in step 119 before the control output of the ignition gas amount of 6 reaches the upper limit value, it can be used as a water heater.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to the flowchart of FIG. As described in FIG. 3, when the ignition gas amount set value in step 112 is output and ignition detection in step 113 is not detected, the ignition detection determination in step 119 is performed while raising the ignition gas amount control value in step 115. I do. When the ignition is detected in step 119, the control output value of the ignition gas amount when the ignition is detected in step 121 is compared with a warning value preset in consideration of the margin from the set value and the upper limit, and the warning value is calculated. If it exceeds the limit, a warning is displayed on the remote controller in step 122, the hot water combustion control is started, and it can be used as a water heater with the warning displayed.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to the flowchart of FIG. As described with reference to FIG. 3, if the ignition gas amount set value output in step 112 is not detected and the ignition detection in step 113 is not detected, the misfire is counted in step 123, and then the ignition gas amount is determined in step 115. While increasing the control value, the ignition detection determination of step 119 is performed. When ignition is detected in step 119, the threshold value set in step 124 is set in consideration of whether or not the number of misfires performed in step 123 affects the use as an appliance due to the occurrence frequency of misfire. Compared with the above, if the threshold value is exceeded, it is determined that a warning is necessary, a warning is displayed on the remote controller in step 122, and hot water combustion control is performed so that the warning message can be used as a water heater.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to the flowchart of FIG. As described in FIG. 3, when the ignition gas amount set value in step 112 is output and ignition detection in step 113 is not detected, the ignition detection determination in step 119 is performed while raising the ignition gas amount control value in step 115. I do. When ignition is detected in step 119, the control output value of the ignition gas amount at that time is relearned in step 125 and updated as a set value. At the next ignition operation, this updated set value is used.

[0022]

As described above, the water heater according to claim 1 of the present invention is installed by setting the initial set value of the gas amount during ignition operation to the lower limit value in consideration of the component variation of the gas species. During the ignition operation during the initial operation by the gas at the place, the gas amount is gradually increased until the amount of gas that ignites the burner is reached, and the control output value of the gas amount detected by the burner is learned, and that value is set. By setting the control output value of the gas amount at the time of ignition, the ignition operation can be performed with the appropriate value of the ignition gas amount in the gas at the actual installation location, and the occurrence of phenomena such as ignition failure and explosion ignition can be suppressed.

The water heater according to claim 2 of the present invention is set in consideration of explosive ignition when ignition failure occurs in the set value of the gas amount at the time of ignition, which is determined as an appropriate value for the appliance. By automatically increasing the gas amount at the time of ignition to the upper limit value of the ignition gas amount control output, there is a problem after ignition, such as a change in the ignition gas amount due to aging and a slight dust clogging in the gas path. It is possible to suppress the operation stop due to poor ignition in a state where it can be used as a water heater without a heater.

In the hot water supply apparatus according to claim 3 of the present invention, in the set value of the gas amount at the time of ignition, when ignition failure occurs, the upper limit value of the control output of the ignition gas amount set in consideration of explosive ignition. Up to the upper limit of the control output value of the ignition gas amount when ignition is detected, the burner can be ignited to be used as a water heater by automatically increasing the amount of gas at the time of ignition. By displaying the warning in comparison with the warning value set in consideration of, it is possible to prevent the water heater from suddenly becoming unusable.

In the water heater according to claim 4 of the present invention, in the set value of the gas amount at the time of ignition, when ignition failure occurs, the upper limit value of the control output of the ignition gas amount set in consideration of explosive ignition. Up to automatically increase the amount of gas at the time of ignition, the burner can be ignited and used as a water heater, and the number of misfirings can be counted to determine the misfire count. By displaying a warning when the threshold value is exceeded, it is possible to prevent the water heater from suddenly becoming unusable.

In the water heater according to claim 5 of the present invention, in the set value of the gas amount at the time of ignition, when ignition failure occurs, the upper limit value of the control output of the ignition gas amount set in consideration of explosive ignition. Up to automatically increase the amount of gas at the time of ignition, the burner can be ignited and used as a water heater, and the control output value of the amount of ignition gas when ignition is detected As an optimum value in, re-learning and responding to changes in ignition gas amount due to aging, etc.
Occurrence of ignition failure can be suppressed.

In the water heater according to claim 6 of the present invention, the combustion gas is a mixture of gas and air, and by changing the amount of air to be mixed, the same effect as changing the amount of gas can be obtained.
It is possible to provide a water heater in which ignition failure is unlikely to occur.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention.

FIG. 2 is a flowchart of the water heater.

FIG. 3 is a flowchart of the water heater according to the second embodiment of the present invention.

FIG. 4 is a flowchart of a water heater according to a third embodiment of the present invention.

FIG. 5 is a flowchart of a water heater according to a fourth embodiment of the present invention.

FIG. 6 is a flowchart of a water heater according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 Water entry thermistor 2 Flow rate sensor 3 heat exchanger 4 Water volume control valve 5 Hot water thermistor 6 gas source valve 7 gas proportional valve 8 fans 9 burners 10 Control unit 11 igniter 12 Ignition detection device 13 Remote control

Claims (6)

[Claims] 1. A water passage provided with a heat exchanger between a water inlet and a hot water outlet, a burner for heating the heat exchanger, a fuel supply device for supplying fuel to the burner, and a burner for the burner. It consists of a fan that supplies air, an igniter that ignites the burner, an ignition detection device that detects the ignition state of the burner, and a control unit that controls the fuel amount and air amount of the burner. During operation, the control output value of the fuel amount when igniting the burner is sequentially and automatically increased from the preset lower limit until ignition to the burner is detected, and the control output value when ignition is detected. A water heater that learns the appropriate value of the amount of ignition gas in the gas at the actual installation location by storing. 2. A water passage provided with a heat exchanger between a water supply port and a hot water outlet, a burner for heating the heat exchanger, a fuel supply device for supplying fuel to the burner, and a combustion for the burner. A fan that supplies air, an igniter that ignites the burner, an ignition detection device that detects the ignition state of the burner, and a control unit that controls the fuel amount and the air amount of the burner are set in advance. A water heater that ignites a burner by increasing the control output value of the fuel amount when igniting the burner when the ignition state is not detected during a predetermined ignition operation with the fuel amount at the time of ignition. 3. The hot water supply according to claim 2, wherein a remote control is provided, and a warning indicating that there is a tendency for poor ignition is displayed on the remote control according to the control output value when the ignition state is detected in the control state of the fuel amount for igniting the burner. vessel. 4. A remote controller is provided to count the number of times that an ignition state is not detected with a preset fuel amount at the time of controlling the fuel amount for igniting the burner, and the count number is set to a set threshold value. The water heater according to claim 2, wherein a warning indicating that there is a tendency for poor ignition is displayed on the remote controller when the number exceeds. 5. The water heater according to claim 2, 3 or 4, wherein the control output value at the time of ignition detection is relearned as the gas amount control output value at ignition in the control state of the fuel amount for igniting the burner. 6. A control output value of a fan rotation speed that determines an air amount, rather than a control output value of a gas amount, is controlled.
The water heater according to any one of 5 above.