JPS6237640A - Hot-water supplier - Google Patents

Abstract

PURPOSE:To permit to reset a safety device automatically and easily at a hot-water supplying port upon abnormal condition such as fluctuation or the like of flame due to a gast of wind, which occurs and can be eliminated temporarily, by constituting the safety device so as to be reset when a water flow switch has outputted the stopping signal of water flow. CONSTITUTION:When the use of the titled supplier is to be stopped, a hot-water supplying cock is closed, then, the water flow switch 71 is put OFF, a main solenoid valve 32 is closed, an ignition lamp 64 is extinguished, a proportional solenoid valve 34 is set at the position of ignition and a combustion fan is stopped. As a result, the output of high level, which is being outputted from a safety timer circuit 83 to an abnormality detecting circuit 82, is converted into low level and the abnormality detecting circuit 82 is reset. Further, said safety timer circuit 83 is reset by the OFF signal of the water flow switch 71. When blow-out of fire, abnormal overheating or remaining of fire are generated while using the titled supplier, the operations the same as described above are effected, therefore, an automatic combustion device is operated as before and hot-water may be obtained when the hot-water supplying cock is opened again after the generating cause of temporary abnormality, such as a gast of wind or the like, has disappeared.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an instantaneous water heater using a gas combustion machine as a heating source.

[Prior Art] Conventionally, a water heater has a hot water supply tap at the hot water supply inlet, and when the tap is opened, a gas combustion machine is automatically ignited and extinguished by an activation signal from a water flow switch installed in the water supply pipe. are manufactured and used in various ways. This water heater uses an electric automatic combustion control device that includes a safety device that detects abnormalities such as blowouts, incomplete combustion, and ignition errors and stops the gas supply. will be done. Also,
Normally, once activated, this safety device is not automatically reset even if the abnormal condition is removed, but is reset by operating a reset means such as a reset switch or by operating a power switch.

[Problems to be Solved by the Invention] However, the above-mentioned safety device does not prevent temporary damage caused by, for example, fluctuation of the burner flame due to gusts of wind, ignition failure in cold weather, or air intrusion into the gas pipe that occurs when replacing a gas cylinder or installing a water heater. Since the reset means may be activated due to various reasons, the user has to operate the reset means each time, which is a disadvantage. In particular, in the case of a large model where the main body of the water heater is installed outdoors and supplies hot water to many places in the house such as bath, kitchen, washroom, hand wash, etc., if the main body has an operating device 81, The user had to go outside to reset, which was extremely troublesome. Furthermore, even if the operating device is installed in a specific room of the house such as the kitchen, if hot water is being supplied in a room other than that specific room, it is necessary to go to that room and operate the set. It took a lot of effort. Furthermore, it is necessary to provide the reset button in the automatic combustion control device, which increases the cost.

An object of the present invention is that when the safety device is activated in the event of an abnormal condition that is temporary and can be eliminated in a short time, such as flame swinging due to gusts or ignition delay at 33 in cold weather, the safety device is reset at the hot water supply port. To provide a water heater that can be automatically and easily reset, thereby eliminating the trouble of resetting at all.

Another object of the present invention is to simplify the configuration by eliminating the need to provide a safety device reset means in the automatic combustion control device.
The objective is to provide a water heater that can be shut down.

[Means for Solving the Problems 1] In order to achieve the above object, the water supply device of the present invention has a hot water tap at the hot water supply inlet, a water supply pipe equipped with a water flow switch that operates when hot water is supplied, and a water supply pipe that is equipped with a water flow switch that operates when an abnormality occurs. A gas combustion machine including a safety device that stops the supply of gas and equipped with an automatic combustion control device that automatically ignites and extinguishes according to the output signal of the water flow switch, and the water supply pipe and the gas combustion machine. Between 1
The automatic combustion control device is configured to reset the safety device when the water flow switch outputs a water flow stop signal.

[Operation and Effects of the Invention] When the user closes the hot water tap at the hot water supply port, the water flow switch provided in the water supply pipe is activated to output a water flow stop signal. When the automatic combustion control device receives the water flow stop signal, it automatically resets the safety device. When the safety device is activated and the gas supply is stopped, the user notices this and closes the hot water tap because the lagoon that is being refueled turns into water. This automatically resets the safety device, so if the abnormality is short-lived and temporary, the automatic combustion control device can be activated by opening the hot water tap again. is extremely convenient as it does not require any special reset operation.

Furthermore, since the water flow switch also serves as a reset switch, there is no need to provide a separate reset switch in the circuit, which simplifies the circuit configuration and reduces manufacturing costs.

[Example] Fig. 1 shows an outdoor instantaneous water heater, in which a water supply pipe 1 connected to a water pipe via a plug, a gas combustion machine 2 as a heating source, and the combustion machine 2 and the A heat exchanger 10 is provided between the water supply pipe 1 and the water supply pipe 1.

The water supply pipe 1 is provided at its downstream end with a large number of hot water supply ports 11 for use in baths, kitchens, washrooms, hand washrooms, and other places in houses, and each hot water supply port 11 is provided with a hot water tap 12. ing. Further, upstream of the heat exchanger 310, a water filter 13, a water drain valve 14, and an automatic level control device (governor) 15 are installed, and a boiling prevention device 16 and a water valve that also serves as a water control valve are installed downstream. A pressure safety valve 11 is attached. Furthermore, heaters 19 energized by a low temperature sensing switch 18 are installed at required locations on the water supply pipe 1 to prevent freezing in cold weather.

The gas combustion machine 2 houses the heat exchanger 10 therein,
Combustion tube 2 with main burner 21 arranged below it
2. Gas supply means 3 to the combustion tube 22; the combustion tube 22;
It includes a combustion air supply means 4, an ignition device 5 for the main burner 21, an operating means 6 for adjusting the thermal power in the main burner 21 and setting the temperature of the hot water to be supplied, and an air conditioning device, as well as an operating state. The gas supply means 3, the combustion air supply means 4, and the ignition device 5 according to the input from the sensor and the input from the operation means 6
It has an automatic combustion control device 1 that controls. The gas supply means 3 includes a main solenoid valve 32, 32, a proportional solenoid valve 34 in a gas supply path 31 connected to a gas supply source via an embolus.
Roughly speaking, the tip of the gas supply path 31 serves as a nozzle 35 for ejecting gas into the main burner 21. The combustion air supply means 4 includes a combustion fan 41
and the fan drive motor 42, which sends combustion air into the combustion tube 22 including the main burner 21 during operation.

The ignition device 5 includes a high voltage pulse generating circuit 51 and a spark discharge terminal (sparker) 52, and continuously generates spark discharge between the sparker 52 and a flame rod sensor 74 to be described later.

The operation means 6 is installed in the main body of the water heater or in a predetermined room such as the kitchen, and the operation box 60 has a main switch (
A power switch) 61, a hot water temperature adjustment dial 62, a power lamp 63, and a combustion lamp 64 are provided.

The automatic combustion control device 7 detects the operation of a water flow switch 71 provided at the upstream end of the water supply pipe 1, a thermistor 72 provided at the downstream end of the water supply pipe 1, and the operation of the combustion fan 41. Wind pressure switch 13, the main burner 2
1, a residual flame safety device 75 installed at the top of the combustion tube 22, and a temperature fuse 76, and inputs from these sensors and the control means 6. Depending on the operation, the fan drive motor 42, the ignition device 5, the proportional solenoid valve 34, and the main solenoid valve 32
and an indicator lamp 6 provided on the operation box 60.
3.64 and a control circuit 8 that lights up the light.

The control circuit 8 includes a DC power supply circuit 81 as shown in FIG.
, abnormality detection circuit 82, normal main switch 61 OFF
(or the leaf F of the reset switch if there is a reset switch) Safety timer circuit 83 including a charging timer that is reset when the charged charge is discharged by operation, combustion fan 41 for a set time before ignition of main burner 21 (for example, several seconds) In order to prevent abnormal combustion due to residual gas by rotating the combustion tube 22 and ventilating (bripurge) the inside of the combustion tube 22, a bripurge circuit 84 turns on electricity to the fan drive motor 42 in stages according to the strength of combustion in the main burner 21. a fan switching circuit 85 for appropriately adjusting the amount of air supplied into the combustion cylinder 22; and the frame rod sensor 7.
a flame detection circuit 86 which inputs the output of 4 and determines whether there is a flame in the main burner 21; a power lamp drive circuit 87 which lights up the power indicator lamp 63 when the main switch 61 is turned on; a stable DC power supply circuit 88; The settings on the hot water temperature adjustment dial 62 provided on the operation box 60 and the detected hot water temperature on the thermistor 72 are input, and the proportional solenoid valve 34 and the fan switching circuit 8 are used to adjust the supply lagoon temperature.
5, and a hot water temperature adjustment circuit 89 that produces an output to control the water temperature. Further, R i RPSBLM and RM H indicate relays.

Next, the operation of this water heater will be explained according to the flowchart shown in FIG.

When the user wants to use this water heater, press the operation box 60.
Turn on the main switch 61 (901). As a result, the power lamp 63 lights up (902) and the proportional solenoid valve 34 is set to the ignition position (903). At this time, the safety timer circuit 83 of the control circuit 8 is set. Next, open the hot water tap 12 of the desired hot water supply port 11 (904). As a result, the water flow switch 71 is turned ON (905), the safety timer circuit 83 and the re-purge circuit 84 are turned on, and the fan drive motor 42 is energized, causing the combustion fan 4 to turn on.
1 is driven (906). As a result, the wind pressure switch 7
3 is ONL (907), and after the output time of the safety timer circuit 83, the relay R1 closes the contact RI, the main solenoid valve 32 is turned on, and spark discharge is performed in the sparker 52 (908). Next, the presence or absence of a flame is determined by the flame rod sensor 74 (909), and if the flame is normal, the main burner 21 is slowly ignited and the combustion lamp is lit (910). When the water temperature adjustment dial 62 is operated, the water temperature adjustment circuit 89 adjusts the water temperature adjustment dial 62.
The proportional solenoid valve 34 is controlled according to the setting, and the energization BB of the fan drive motor 42 is turned on (911) to adjust the thermal power. In this embodiment, the combustion fan 41 can be adjusted in three stages. Next, since no more spark discharge is required, the spark discharge at the sparker 52 is stopped (912). This state is the steady state during hot water supply,
The user can obtain the desired amount of water and the appropriate amount of hot water. When discontinuing use, close the open hot water tap 12. As a result, the water flow switch 71 is turned to F, the main solenoid valve 32 is closed, the combustion lamp 64 is turned off, the proportional solenoid valve 34 is set to the ignition position, and the combustion fan 41 is stopped (913).
. As a result, from the safety timer circuit 83 to the abnormality detection circuit 82
The high level output that was being output to is inverted to low level, and the abnormality detection circuit 82 is reset. Furthermore, the safety timer circuit 83 is activated by the OFF signal of the water flow switch 71.
is reset (919). Frame rod sensor 7
When the absence of flame is detected in step 4, the power lamp 63 is blinked, the main solenoid valve 32 is closed, the spark discharge at the sparker is stopped (914), and the combustion fan 41 is then stopped (915). . In this case, the user first turns the main switch 61 to 0 [F], removes the cause of the abnormality, and then turns the main switch 61 back on. In addition, if a blowout, abnormal overheating, or residual flame occurs during use, please refer to the above (
914) is performed. When the user stops using the hot water supply device δ, the hot water tap 12 is closed, the operation is stopped, and the main switch 61 is turned on.

In the present invention, each time the hot water tap 12 is closed, the water flow switch 71
The safety timer circuit 83 is turned off and the safety timer circuit 83 is reset.
If the user notices that the hot water being supplied has turned to cold water and turns off the hot water tap 12, the safety device is automatically reset (917). Therefore, after the temporary abnormality such as a gust of wind has disappeared, hot water can be obtained by opening the hot water tap 12 again (904).

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of the water heater of the present invention, FIG. 2 is a block diagram of an automatic combustion control circuit, and FIG. 3 is an explanatory diagram for explaining its operation control.

Claims (1)

[Scope of Claims] 1) A water supply pipe having a hot water tap at the hot water supply inlet and a water flow switch that operates when hot water is supplied, and a safety device that stops the gas supply in the event of an abnormality, and the output of the water flow switch. A water heater comprising: a gas combustion machine equipped with an automatic combustion control device that automatically ignites and extinguishes the fire according to a signal; and a heat exchanger interposed between the water supply pipe and the gas combustion machine. A water heater, wherein the automatic combustion control device resets the safety device when the water flow switch outputs a water flow stop signal.