JPS59215539A - Control circuit of hot water supply machine - Google Patents

Abstract

PURPOSE:To improve efficiency at the time of repairing at a selling agent or a selling company and to lighten a burndon to be imposed on a user, by a method wherein a digital indicating article indicating an operation state of a hot water supply machine is provided and when an abnormal state of the hot water supply machine and trouble of parts are generated, contents of them are classified and indicated by a digital indicator through a symbol and a figure. CONSTITUTION:When the signal of detection of a flame is not applied to a microcomputor 23 even after the laspse of a fixed period of time irrespective of a matter that a burner 13 has started operation, ''1'' (error 1) is displayed by a digital indicator 33 in preference to display of an operating state and at the same time action of the burner 13 is suspended also. This is the display showing shortage of fuel oil. Then when a detecting electrode 17 of an empty tank and an earthquake detector 19 are operated respectively, ''2'' or ''3'' is displayed respectively on the digital indicator 33. The former and the latter of those become displays uriging water supply to a user and resetting of the earthquake detector respectively. The burner 13 is suspended at this time too.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control circuit for a water heater, and in particular, it provides a digital display that displays the operating status of the water heater, and also detects abnormal conditions or component failures of the water heater. When a problem occurs, its contents are classified and displayed using symbols, numbers, etc. on the digital display.

Conventional configuration and its problems In conventional water heater control circuits, when displaying the operating status, lamps or LEDs are generally used.
The contents are ``human'' and ``off'' of the operation switch, and one operation of the heating means.''

Many of them simply monitored the normal status of the equipment, such as the "stopped" status. Even if there is a device that can indicate the abnormal condition of a device, the content is limited to a single abnormality indicator lamp or two or three indicators to indicate typical abnormal conditions. There was only one.

FIG. 1 shows the configuration of a display panel section of a conventional oil water heater. 1 to 4 are LED indicators, 1 is an "operation" lamp that monitors the normal operation of the equipment, and 2 to 4 are "out of oil" lamps, respectively.
, ``Water detection,'' and ``Earthquake.'' .

As can be seen in this example, even if multiple abnormal conditions are displayed, the contents should alert the user,
Limited to what the user can process. Therefore, no indication is given in the case of an abnormal condition due to a defective component inside the device, and the condition occurs as soon as the device stops or performs an irregular operation. In these cases,
Dealers and sales companies carry out repairs, but it is not easy to discover where the malfunction is in the equipment, which requires time and effort, and the cost of repair is also high. Furthermore, in cases where there is no abnormality indication or only a single indicator is used,
Furthermore, many of these problems were problems that could be handled by the user, and it was often the case that the user had to ask the retailer or sales company to solve the problem. If we tried to display the details of these failures using one display for each phenomenon as in the past, the number of displays would increase, and the number of displays would increase accordingly. This results in a display that is difficult for the user to see.

Furthermore, an explanation of the failure must also be clearly written on the display that is intended to display the details of the failure, which is not very good in terms of the appearance of the product.

Therefore, in order to deal with these problems, the abnormal status of the water heater can be displayed using numbers or symbols, making the display easier to read, making it possible to display many types of information, and further improving the internal structure of the equipment. By displaying defects by content, it is also possible to improve efficiency at the time of repair at dealers, sales companies, etc. However, when multiple failures occur at the same time, only one failure content can be displayed at the same time. Once the repair person at the dealership has repaired one fault, the remaining faults will be displayed. At that time, there is no problem if it can be repaired immediately, but depending on the nature of the failure, it may be necessary to prepare replacement parts in advance, and the repair may have to be restarted again, resulting in a problem that the efficiency of the repair is low.

Another possible method of displaying multiple failures is to switch the failure details at regular time intervals, but displaying them simultaneously has the advantage of being instantaneously and more clearly displayed. have

Purpose of the Invention In view of the above-mentioned conventional problems, the present invention makes it easier to see the abnormal state of the water heater by displaying the abnormal state of the water heater using numbers, symbols, etc., and also makes it possible to display many types of equipment. Internal defects are also displayed by content, and when multiple failures occur at the same time, multiple display contents are displayed at the same time, increasing the efficiency of repairs at dealers, sales companies, etc., and making it easier for users. The purpose is to lighten the burden.

Structure of the Invention The basic structure of the present invention to achieve the above object is to detect the detection signals of sensors such as a zaminuta that detect various states of the water heater, and a detection circuit that transmits the signals of these sensors to a control means. This system is equipped with a plurality of digital displays to display the status of the water heater.

DESCRIPTION OF EMBODIMENTS FIG. 2 is a longitudinal cross-sectional view of an oil water heater according to an embodiment of the present invention. 10 is a heat exchanger equipped with a water supply port 11 and a hot water supply 1'' 12 on its upper part; 13 is a combustion device equipped with an electromagnetic pump, a fan motor, an ignition device, etc. so as to perform combustion inside the heat exchanger 10; 14 is a baffle plate for efficiently transmitting the combustion heat generated by the combustion device 13 to the heat exchanger 10, and 15 is an air port 1' for discharging the exhaust gas after heat exchange. It's a trench, 16-19 are sensors, 1
6 is a thermistor for detecting the temperature of hot water in the heat exchanger 10; 17;
18 is a flame detection element such as a phototransistor that monitors the combustion state of the combustion device; 19 is an earthquake detector that is activated by the vibration of the equipment; connected to the controller by a wire.

FIG. 3 is a control circuit block diagram of this embodiment.

Reference numeral 20 denotes a remote control unit (remote controller), which is connected to a control circuit 22 on the main body side through a V-wire 21 (a cape having a seven-core configuration). The main body control circuit 22 is equipped with a microcomputer 23 which is a main control means, and a signal detection circuit 24 which transmits signals from various sensors on the main body to the microcomputer 23 and a signal from the thermistor 16 to the microcomputer 23. A temperature control circuit 25 for transmission, a burner control means 26 for receiving signals from the microcomputer 23 and controlling the combustion device 13 used as a heating means, and a driver circuit 27 for driving the burner control means 26 are connected. 28 is a system power supply that supplies power to these circuits, and this system power supply 28 also powers the remote control 2.
0 power is also supplied.

On the other hand, the remote control 20 is connected to a temperature control circuit 25, a temperature control volume 29 for setting the water temperature of the water heater, and a microcomputer 23 through three signal lines (data, clock, and strobe). computer 2
3 is provided with a shift register circuit 30 for converting the serial data sent from 3 into parallel data, and further receives the parallel output of the shift register circuit 30, a part of which is input to a switch circuit 31 and the rest to a decoder circuit 32. There is.

The digital display 30 is driven by the signal decoded by the decoder circuit 32. On the other hand, the switch circuit 31 transmits the operation switch signal from the remote control to the microcomputer 23.

FIG. 4 is an external view of the remote control according to this embodiment, in which the digital display 33, operation switch 34, operation lamp 35, temperature control volume 29, etc. are shown in the front for operation or display.

Table 1 is a table showing the status of the kerosene water heater of this embodiment, the contents displayed on the digital display at that time, and the operating status of the combustion device.

Table 2 is a table showing a display example when a plurality of abnormalities occur simultaneously.

Table 1, Table 2, and FIG. 5 are schematic flowcharts showing the functions of the microcomputer 23. First, the data input from the signal detection circuit 24 and the temperature control circuit 25 are judged, and if it is abnormal, the data corresponding to the content is displayed on the digital display 33 (E1 to E6), and the combustion Stop the device 13. If the input signal is normal, display data of the operating state is displayed on the digital display 33 by a combination of various signals.

Next, in response to the signal from the switch circuit 31 and the boiling signal, when the operation switch 34 is turned on (ON) and the boiling is not activated, the combustion device 13 is activated, and the operation switch 34 is turned off or The combustion device 13 is stopped during the waiting period for boiling.Finally, data to be transmitted to the remote control 20 is output.

Next, the operation of this embodiment will be explained.

The state of the thermistor 16 is transferred to the temperature control circuit 25, where it is constantly compared with the signal from the temperature control volume 29, and the result is transmitted to the microcombination circuit 23. At the same time, the state of the thermistor 16 is the upper limit of its resistance value (broken wire).
, the lower limit value (short circuit) is checked, and the result is also sent to the microcomputer 23. Further, the states of the empty tank detection electrode 1, flame detection element 18, and earthquake detector 19 are also transmitted to the microcomputer 23 via their respective signal detection circuits 24. Therefore, when all of these signals are normal, if you turn on the operation controller 34 with the remote control 20, an operation start signal is transmitted to the microcomputer 23 via the controller circuit 31, and the microcomputer 23 starts the operation via the driver circuit 27. The burner control means 26
The combustion device 13 starts operating. When combustion begins, the flame detection element 18 detects this and transmits it to the microcomputer 23.

Combustion continues in this manner, and when the temperature of the hot water rises, the signal is sent to the temperature control circuit 26 through the heater 16, and when the microcomputer 23 receives the boiling signal, it stops driving the combustion device 13.

Next, the operation at the time of abnormality (failure) will be explained. Even though the combustion device 13 has started operation immediately, if the flame detection signal is not input to the microcomputer 23 even after a certain period of time has passed, the dental display 33 will take priority over the operation status display and display "1". ” (Error 1) is displayed, and at the same time, the operation of the combustion device 13 is also stopped. This is an indication that the oil is running out.

If the empty tank detection electrode 17 and the earthquake detector 19 operate, the digital display 33 will show [-2] or “
3" is displayed respectively. The former prompts the user to refill water, while the latter prompts the user to re-centre the earthquake detector. At this time as well, the combustion device 13 is stopped. rl, J,
Both r2J and r3J displays have contents that can be processed by the user.

Next, when a signal indicating a short circuit or disconnection of the thermistor 16 is transmitted from the temperature control circuit 25 to the microcomputer 23, the digital display 33 displays r4J and r5J, respectively, and the combustion device 13 is stopped. If the ignition signal is manually input from the flame detection circuit 24 even though the small driver circuit 27 is not being driven, it is obvious that the flame detection element 1
8 or a failure of the flame detection circuit 24, "6" is displayed on the dental display 33, and the combustion device 13 is no longer operated.

In the case of the above r4J, r5J, and r6J displays, the processing must be handled by the dealer or sales company.6 However, since the contents are already roughly known, repairs can be made very quickly. If the user tells the dealer or sales company the display number at the same time when contacting them, the dealer or sales company can generally limit the parts and tools that should be brought. It also has a significant effect. In particular, since multiple failures can be detected at the same time, there will be no need to start over due to parts shortages.

Of course, when rIJ, r2J, and r3j are displayed, the content to be processed becomes clear to the user, which improves usability.

Effects of the Invention As described in Section 2, according to the present invention, the operating status is classified and displayed at all times, and the details are displayed at abnormal times. In addition, it is possible to simultaneously display and notify not only the operating status of the water heater, but also multiple malfunctions of its own parts. This has a major effect on improving repair and serviceability for users, retailers, and sales companies.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the display panel of a conventional oil water heater, Fig. 2 is a vertical sectional view of an oil water heater according to an embodiment of the present invention, and Fig. 3
FIG. 4 is a block diagram of the control circuit, FIG. 4 is an external perspective view of the remote control, and FIG. 5 is a schematic flowchart 1 of the microcomputer. 10...Heat exchanger, 13...Combustion device (heating hand G), 16-=-thermistor (sensor),
17... Empty tank detection voltage] (sensor), 18.
...Flame detection element (sensor), 19...Earthquake detection element (sensor), 20...Remote control (remote control section),
23...Microcomputer (control constant 8), 2
4... Signal detection circuit, 26... Burner control means (heating means), 33... Digital display. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 2θ

Claims (4)

[Claims] (1) A water heater having a heating means, a sensor such as a thermistor that detects various states of the water heater, a detection circuit that transmits signals from these sensors to a control means, and a plurality of digital displays driven by the control means. If the sensor detects an abnormal condition in the water heater, or if a failure occurs in the sensor or circuit itself, the details of the abnormal condition or failure are indicated by numbers, symbols, etc.
) A control circuit for a water heater configured to display classification on a digital display. (2) A control circuit for a water heater according to claim 1, wherein the digital display is configured to display a plurality of display contents simultaneously. (3) The control circuit for a water heater according to claim 1, which is configured to forcibly stop the operation of the heating means depending on the nature of the abnormality of the water heater, or when a sensor or the circuit itself fails. (4) A control circuit for a water heater according to claim 1, wherein a microcomputer is used as the control means.