JPH05282003A - Gas hot water supplier controller - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a gas water heater control device whose gas pressure setting and adjustment are easy. [Configuration] The control signal of the proportional valve 6 output from the computer 1 is changed to maximum and minimum by the up / down switches 10 and 11 while observing the gas pressure gauge 7 with the maximum and minimum of the control signal by the switch 2. The value of the control signal when it reaches the target value is registered in the memory 1. Further, the control signal can be automatically adjusted by feeding back the detection value of the gas pressure gauge 7 to the control circuit 14 and comparing it with each target value. [Effect] It is possible to easily perform the adjustment without using the volume as in the past.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas water heater controller for controlling a gas water heater using a computer.

[0002]

2. Description of the Related Art A proportional valve used to control gas pressure in a gas water heater is designed to control gas pressure in accordance with the magnitude of current output from a control device. Since this proportional valve has variations in current-gas pressure characteristics, it is necessary to perform gas pressure setting adjustment for setting the variable range of the current value from maximum to minimum for each proportional valve.

FIG. 2 is a block diagram showing a portion for performing the above-mentioned gas pressure setting adjustment in a conventional control device. The control computer 1 has a switch 2 for selecting each mode of maximum combustion, normal combustion and minimum combustion. Are connected. First, the switch 2 is switched from the normal combustion mode to the minimum combustion mode. As a result, the computer 1 outputs a proportional valve control signal indicating 0% (minimum pressure). This control signal is converted into a voltage by the signal-voltage conversion circuit 3 and then applied to the voltage-current conversion circuit 5 through the adjustment circuit 4 and converted into a current.

This current controls the proportional valve 6 to the minimum pressure, and the gas pressure at that time is indicated by the gas pressure gauge 7. The indicated value at this time varies depending on the proportional valve 6. Therefore, the volume 8 for adjusting the minimum current is operated to adjust the gas pressure gauge 7 to indicate a predetermined minimum pressure target value. As a result, the proportional valve 6 is adjusted so that the target minimum pressure is correctly obtained with the control signal of 0%.

Next, the switch 2 is switched to the maximum combustion mode. As a result, the computer 1 outputs a control signal instructing 100% (maximum pressure), and the proportional valve 6 is controlled to the maximum pressure including variations in response to this. Therefore, the maximum current adjusting volume 9 is operated to adjust the gas pressure gauge 7 to indicate a predetermined maximum pressure target value.
The proportional valve 6 is adjusted by this, and the control signal 100%
The target maximum pressure can be correctly obtained at.

When the adjustment is completed as described above, the adjusted positions of the volumes 8 and 9 are fixed with an adhesive or the like, and the switch 2 is returned to the normal combustion mode.

[0007]

Since the conventional gas pressure setting adjustment is performed as described above, in order to check whether or not the proportional valve 6 operates normally, the two volume 8, 9 has to be moved from the minimum to the maximum, which requires time and effort for the shipping inspection, and the volumes 8, 9
Automatic adjustment using is not easy. Further, there is a problem in that a tool such as a dedicated screwdriver is required for adjusting the volumes 8 and 9, and that it is necessary to fix the volumes 8 and 9 with an adhesive after the adjustment is completed. It was

The present invention has been made in order to solve the above problems, without using a volume,
An object of the present invention is to provide a gas water heater control device that adjusts gas pressure settings.

[0009]

According to a first aspect of the present invention, a switch for instructing the computer so that a control signal output from the computer has a maximum value or a minimum value, and a change of the maximum value and the minimum value. And a memory for storing the changed maximum and minimum values.

Further, in the invention of claim 2, a switch for instructing the computer so that the control signal output from the computer has a maximum value or a minimum value,
While comparing the detected value of the gas pressure in the proportional valve and the target value of the maximum value when the control signal is instructed to the maximum value by the switch, the control signal is instructed to the minimum value by the switch. A control circuit that compares the detected value at this time with the target value of the minimum value and outputs a signal for instructing the computer to change the maximum value and the minimum value in accordance with the respective comparison results.

[0011]

According to the first aspect of the present invention, the switch such as the up / down switch is pressed while observing the gas pressure gauge to match the maximum and minimum values of the control signal with the target value and register the values in the memory.

In the second aspect of the present invention, the gas pressure detection value is fed back and compared with the maximum and minimum target values,
The maximum and minimum values of the control signal are automatically changed according to each difference and registered in the memory.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, the same parts as those in FIG. In FIG. 1, a computer 1 is connected with a gas pressure up switch 10 and a gas pressure down switch 11, and a memory 12 composed of an E ² PROM. Further, the detected value of the gas pressure gauge 7 is applied to the control circuit 14 and compared with each target value of the maximum value and the minimum value. The comparison result is applied to the computer 1 through the communication interface 15.

Next, the operation when the gas pressure setting adjustment is performed with the above configuration will be described. This adjustment can be done manually or automatically. First, the case of performing manual adjustment will be described. At this time, the control circuit 14 is not used. The switch 2 is switched from the normal combustion mode to the minimum combustion mode. As a result, a 0% control signal is output from the computer 1, and the proportional valve 6 is controlled to the minimum pressure. At this time, looking at the gas pressure gauge 7, if the gas pressure is lower than the target value, the switch 10 is pushed. Computer 1 accordingly
Increases the control signal by one step. If the gas pressure is higher than the minimum target value, pressing the switch 11 causes the control signal to decrease by one step. When the gas pressure reaches the target value by operating the switches 10 and 11, the switch 2 is switched to the normal combustion mode side. Then, the computer 1 registers the value of the control signal at this time in the memory 12.

Next, when the switch 2 is switched to the maximum combustion mode, a 100% control signal is output and the proportional valve 6 is controlled to the maximum pressure. Therefore, while watching the gas pressure gauge 7, the switches 10 and 11 are operated to adjust the gas pressure to the maximum target value. When the switch 2 is returned to the normal combustion mode when the target value is reached, the value of the control signal at this time is registered in the memory 12.

During normal combustion of the gas water heater, the control signal changes within the range from the minimum value to the maximum value registered in the memory 12 to control the proportional valve 6.

Next, the automatic adjustment will be described. In this case, the switches 10 and 11 are not used and the control circuit 14
Is used. First, the switch 2 is set to the minimum combustion mode and the control signal is set to 0%. The detected value of the gas pressure gauge 7 at this time is added to the control circuit 14 and compared with the minimum target value. The signal of the difference is applied to the computer 1 through the communication interface 15, and the computer 1 corrects the control signal according to the difference and registers the value when the difference becomes zero in the memory 12.

Next, if the switch 2 is switched to the maximum combustion mode and the control signal is set to 100%, in the same manner as above,
The control circuit 14 compares the detected value of the gas pressure with the target value of the maximum value. The control signal is modified until the difference becomes zero, and the modified value is registered in the memory 12.

[0019]

According to the invention of claim 1, since the computer is provided with the switch for instructing the change of the maximum value and the minimum value of the control signal, the gas pressure setting adjustment can be performed without using the volume. The work becomes easy, and once set, there is an effect that it is not displaced due to vibration or the like.

Further, according to the invention of claim 2, the detected value of the gas pressure is fed back and compared with the target value of the maximum value and the minimum value, and the maximum value and the minimum value of the control signal are determined according to the comparison result. Since it is changed, the effect that the gas pressure setting adjustment can be automatically performed is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas water heater controller according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional gas water heater control device.

[Explanation of symbols]

 1 Computer 2 Switch 6 Proportional Valve 12 Memory 14 Control Circuit

Claims (2)

[Claims] 1. A computer for outputting a control signal for controlling a proportional valve, a switch for instructing the computer to set the control signal to a maximum value or a minimum value, and the computer for changing the maximum value and the minimum value. And a memory for storing the changed maximum and minimum values. 2. A computer for outputting a control signal for controlling a proportional valve, a switch for instructing the computer to set the control signal to a maximum value or a minimum value, and the switch for instructing the control signal to the maximum value. The detected value of the gas pressure in the proportional valve and the target value of the maximum value when compared, and the detected value and the target value of the minimum value when the control signal is instructed to the minimum value by the switch And a control circuit for outputting a signal for instructing the computer to change the maximum value and the minimum value in accordance with the respective comparison results.