JPH01239316A - Control device for hot water supply device - Google Patents

Abstract

PURPOSE:To ignite a burner quickly to prevent a decrease in temperature of hot water when the burner is re-started by feeding water, by detecting the temperature of a burner tip in advance of operating a combustion air blower, an igniter, and then a fuel control device sequentially by means of an ignition control-driving device. CONSTITUTION:In the case a burner is re-ignited by feeding water after stopping combustion, the water flow is detected by a water flow detector 2, and when the signal of water flow is received by a control device 25, an ignition control- driving device 24 reads a signal from a thermocouple 21 that detects the temperature of a burner tip, and judges whether it is at a temperature suitable for re-ignition. And when suitable, a fan 10 is started at a low speed suitable for supplying an adequate amount of air for ignition, an ignition plug 12 is speak- discharged by a signal, and a fuel gas proportional valve 8 is opened so as to feed an amount of gas required for ignition, so that ignition takes place. The existence of a flame is detected by a flame rod 13, and a continuous combustion takes place when the frame is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for a water heater that obtains hot water using heat generated by combustion.

BACKGROUND ART As an example of a conventional technique, a gas instantaneous water heater will be described as an example.

In FIG. 8, water is supplied from a water vent 1, passes through a water quantity detection device 2 as a combustion instructing device, a constant water quantity device 3, absorbs heat in a heat exchanger 4, and is turned into hot water and supplied from a tap 5. . Gas is guided from a gas port 6 to a burner 9 through a gas electromagnetic valve 7 and a gas proportional valve 8 which is a fuel control device, and is combusted. Air necessary for combustion is supplied by a fan 10 as a combustion blower, and exhaust gas is discharged from an exhaust port 11. Further, downstream of the burner 9, there is a spark plug 12 as an ignition device, and a flame rod 1 as a combustion determination device.
3 is provided at a location where ignition and combustion determination can be easily performed. Further, each of the above-mentioned devices is controlled by a control device 14.

FIG. 9 shows an outline of the sequence when the fuel is ignited by flowing water again after it has been combusted.

When the water is stopped after combustion (Sl), the water amount detection device 2
A signal is sent to the control device 14 to determine whether or not water is flowing, and the control device 14 sends a signal to the gas proportional valve 8 to stop the gas supply. Now let's consider the case where water is flowed again to cause combustion. The control device 14 receives the signal from the water amount sensor 2 and attempts to ignite the water (S4). However, the fan 10 does not rotate until, for example, four seconds have passed after the burner 9 is extinguished.

This is because if the burner nozzle is at a high temperature, a backfire may occur if the burner is relit. To prevent this, re-ignition is prohibited for a few seconds.

When 4 seconds have elapsed (S5), the fan 10 rotates, the spark plug 12 starts discharging (S7), the gas proportional valve 8 starts flowing gas S8), and it is determined whether or not the flame rod 13 is burning (sg). , the combustion continues (slo).

Problems to be Solved by the Invention However, in the conventional technology, re-ignition is prohibited for a certain period of time no matter what the temperature state of the flame opening of the burner 9 is. As a result, although the water is flowing, there is no fire, and the temperature of the hot water drops, reducing the usability of showers and the like.

In order to solve the above-mentioned problems, the present invention aims to detect the temperature of the burner flame opening and immediately ignite the burner if it is below the temperature at which flashback occurs, thereby preventing a drop in the hot water temperature and improving usability. .

Means for Solving the Problems In order to achieve the above objects, the water heater control device of the present invention includes a burner device that burns fuel, a temperature detection device that detects the temperature of the burner flame opening of the burner device. An ignition device that ignites the fuel, a fuel control device that controls the amount of fuel, a combustion blower that supplies air necessary for burning the fuel and discharges combustion exhaust gas generated by combustion, and the burner. a combustion instruction device that gives a combustion instruction to the device;
A combustion determination device that determines whether or not combustion is occurring in the burner device; and a signal from the combustion instruction device, a signal from the temperature detection device, and a signal from the combustion determination device to control the ignition device and fuel control. This configuration includes a device and an ignition control drive means for driving a combustion blower device.

Function The present invention determines the temperature of the burner flame opening with the above-described configuration, and if it is below the temperature that causes backfire, uses the ignition control drive means to drive the combustion blower and drive the ignition device,
The fuel control device is activated to ignite and prevent the water temperature from dropping.

Example FIG. 1 is a block diagram showing an embodiment of the present invention.

Water is supplied from a water inlet 1, passes through a water quantity detection device 2 as a combustion instructing device, a constant water quantity device 3, absorbs heat in a heat exchanger 4, becomes hot water, and is supplied from a tap outlet 5. The gas is guided from the gas port 6 to a burner 91 through a gas electromagnetic valve 7 and a gas proportional valve 8 which is a combustion control device, and is combusted. Air necessary for combustion is supplied by a fan 10 as a combustion blower, and exhaust gas is discharged from an exhaust port 11. Further, downstream of the burner 9', there is a spark plug 12 as an ignition device.
A flame rod 13 serving as a combustion determination device is provided at a location where ignition and combustion determination can be easily performed.

Further, FIG. 2 shows a block diagram of the burner 9'. In FIG. 2, the burner 9 has four burner units 15 and a fire transfer plate 16.
and a burner case 17.

A sectional view of the burner unit 15 is shown in FIG. In FIG. 3, the burner unit 15 is composed of a burner rectifier 18 and a burner port 19.

Further, a schematic front view of the burner unit 15 is shown in FIG.

In FIG. 4, a burner cap 20 is press-fitted into one end of the burner unit 15 to prevent gas leakage. Further, a thermocouple 21 as a temperature detection device for detecting the temperature of the burner flame port 19 is attached to the burner cap 20. FIG. 5 shows how and where the thermocouple 21 is mounted.

The thermocouple 21 is fixed to the burner cap 20 with an adhesive 22, inserted between the burner rectifier 18 and the flame port 19, and positioned and fixed by press-fitting the burner cap 2o.

Now, let's go back to Figure 1 and explain. A control device 123 that controls each device, a signal from the water amount detection device 2, a signal from the thermocouple 21, and the frame lot 3
An ignition control drive means 24 that drives the spark plug 12, gas proportional valve 8, and fan 10 by signals from the ignition control device 25 constitutes a control device 25 for the entire appliance.

FIG. 6 shows a sequence in which water is flowed once to cause combustion, and then water is flowed again to ignite.

Let it burn (S11) and turn off the water (512)
Then, the signal from the water amount detection device 2 disappears (512), and since there is no combustion instruction, the control device 123 sends a signal to the gas proportional valve 8 to stop the gas supply (Si3) and extinguish the fire. When water is flowed again to cause combustion, the water amount detection device 2 determines whether water is flowing. When the control device 25 receives a signal indicating that water is flowing from the water amount detection device 2, the ignition control drive means 24 first reads the signal from the thermocouple 21 in order to detect the temperature of the flame cloth (515).

The signal from the thermocouple 21 is checked to determine whether the temperature is suitable for re-ignition (516), and if it is, the fan 10 is rotated at a slow ignition speed to obtain a good amount of air for ignition (517). ), sends a signal to the spark plug 12 to discharge it (StS), opens the gas proportional valve 8 to supply the amount of gas necessary for ignition (519), and determines whether combustion is occurring using the flame rod 13 (920). ), if it is burning, it will continue burning.

Here, the flame rod is used to determine combustion using the electrical conductivity of flame.

The configuration of the ignition control drive means 24 will be explained in FIG.

The ignition control drive means 24 has the following configuration. A signal from the water amount detection device 2 is sent to the 110 section 29 of the microcomputer 2B by a transistor 26 and an operational amplifier 27. Similarly, the burner mouth temperature is determined by the operational amplifier 33,
The signal is sent to the A/D converter 34 and then to the 1/0 section 29. In addition, the signal of the frame rod 13 is transmitted through FET 35, transistor 36, and operational amplifier 37 to 110 parts 2.
Sent to 9. Also, microcomputer 28 is +70
section 29, cpv section 30, RAM section 31, and ROM section.

It is composed of 32 pieces. The 110 section 29 is connected to a D/A converter 38, an amplifier 39, and a gas proportional valve 8 on the output side. Similarly, a transistor 40, a relay 41, and an ignition transformer 42 are connected to the spark plug 12. Further, the fan 10 is connected to a D/A converter 43, an amplifier 44, and a fan drive circuit 45.

A pulse signal is output from the water amount detection device 2 according to the amount of water, and a pulse signal is outputted from the microcomputer 2B by the transistor 26 and the operational amplifier 27.
The signal is captured by the microcomputer (hereinafter referred to as the microcomputer), and the CPU
30 calculates the number of pulses per second. The number of pulses per second corresponding to the amount of ignition water is stored in the ROM section 32 in advance, and the value calculated by the CPU section 30 and the value stored in the ROM section 32 are compared. If there are many values calculated by the CPU section 30, the microcomputer 2B
1 signal is read from the 110 section 29 by the action of the operational amplifier 33 and the A/D converter 34. This is also ROM section 32
The CPU unit 30 compares whether the temperature is higher than the flashback occurrence temperature of the flame opening stored in the memory. In addition, a signal from the flame rod 13 is sent to the FET to indicate that there is no flame in the burner section.
(35), 1 by transistor 36 and operational amplifier 37
10 Part 29 is read into the microcomputer 2B. Here, the following conditions are stored in the RAM section 31 in the microcomputer 2B: the signal from the water amount detection device 2 is greater than or equal to the ignition water amount, the flame cloth temperature is lower than the flashback temperature, and there is no flame (combustion When it is determined that the microcomputer 2B has not
Since the 10 parts 29 are large, the ROM part 32 is first sent to the fan 10.
The ignition air volume data stored in the ignition air volume is outputted from the 110 section 29 to the D/A converter 43. The data converted into analog output by the D/A converter 38 is amplified by the amplifier 44 and sent to the fan drive circuit 45 to rotate the fan 10. Then, from 110 part 29, spark plug 1
Issue an ignition command to 2. The ignition command causes the transistor 4o to operate the relay 41, the ignition transformer 42, and the ignition plug 12 to cause discharge. Then, the microcomputer 28 outputs the ignition and gas amount stored in the ROM section 32 from the 110 section 29 to the O/A converter 38 . The data converted into analog data is amplified by an amplifier 39, and the gas proportional valve 8 is operated to release the amount of gas necessary for ignition, thereby lighting the fire.

With the configuration of the above-described embodiment, when the temperature of the burner flame port is below the flashback generation temperature, the burner is ignited at any time, thereby preventing a drop in the hot water temperature and improving usability.

Effects of the Invention As is clear from the above embodiments, the water heater control device of the present invention includes a burner device that burns fuel, a temperature detection device that detects the temperature of the burner flame opening of the burner device, and a temperature detection device that detects the temperature of the burner flame opening of the burner device. An ignition device that ignites the fuel, a fuel control device that controls the amount of fuel, and the air that is necessary to burn the fuel.
A combustion blower device that discharges combustion exhaust gas generated by fuel, a combustion instruction device that gives a combustion instruction to the burner device, a combustion determination device that determines whether or not combustion is occurring in the burner device, and from the combustion instruction device. By providing an ignition control drive means for driving the ignition device, the fuel control device, and the combustion blower device using the signal from the temperature detection device, the signal from the temperature detection device, and the signal from the combustion determination device, the flame port of the burner device is It can be ignited at any time when the temperature of the tank falls below the flashback temperature, which prevents the water temperature from dropping and improves usability.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a water heater showing one embodiment of the present invention;
The figure is a block diagram of the burner device, Figures 3, 4, and 5 are block diagrams of the burner unit, Figure 6 is a schematic sequence diagram of an embodiment of the present invention, and Figure 7 is an embodiment of the present invention. FIG. 8 is a block diagram of an example ignition control driving means, FIG. 8 is a block diagram of a conventional water heater, and FIG. 9 is a sequence diagram of a conventional water heater. 2...Water amount detection device (combustion instruction device), 8...
...Gas proportional valve (fuel control device), 9'...
・Burner device, 10...Fan (combustion blower), 21...Thermocouple (temperature detection device), 24
...Ignition control drive means, 26.36.40...
...transistor, 27.33.37...
Operational amplifier, 2 days...Microcomputer,
34...A/D converter, 3B, 43...
D/A converter, 39.44...Amplifier, 41.
...Relay, 42 ...Ignition transformer, 45
...Fan drive circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person2-
Water f detection table 1 3- Force proportional valve 9° - Burner 1 10- Fan 2+ - Single electric couple 24- Point large IPJ wholesale, drive + I or Fig. 2 IA 1”1 Fig. 3 Fig. 4 Fig. 5 Fig. 6 2j-μ t7-? e'1.33--operation up e8- microcomputer 34-A/Q Shun15 37- operation up'43.43-D/Al lt W dry-1-7 Kijo Trance Figure 8 Figure 9

Claims (1)

[Claims] A burner device that burns fuel, a temperature detection device that detects the temperature of a burner mouth of the burner device, an ignition device that ignites fuel spouted from the burner mouth, and fuel that is supplied to the burner device. a fuel control device that controls the amount of fuel; a combustion blower that supplies the air necessary to burn the fuel and discharges the combustion exhaust gas generated by the combustion;
A combustion instruction device that gives a combustion instruction to the burner device, a combustion determination device that determines whether or not the burner device is burning, a signal from the combustion instruction device, a signal from the temperature detection device, and the combustion determination device. A control device for a water heater, comprising an ignition control drive means for driving the ignition device, the fuel control device, and the combustion blower device using a signal from the device.