JPH0470531B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a direct ignition device that does not use a pilot burner in a water heater that is not an AC control type that uses a proportional control valve or the like and a bathtub with a water heater. Moreover, the present invention relates to a slow ignition device that allows slow ignition without explosive ignition at the time of ignition.

[Conventional technology]

In water heaters and bathtubs with water heaters that are not AC-controlled water heaters that use a proportional control valve or the like, the main burner is ignited by transferring the flame from the pilot burner. Note that some AC-controlled water heaters that use a proportional control valve directly ignite the water without using a pilot burner.

[Problem to be solved by the invention]

However, with the above ignition method, the pilot burner must always be lit to obtain hot water, or the pilot burner must be lit before hot water is supplied; in the former case, hot water cannot be supplied. There is an economical problem in that gas is wasted even when not in use, and the latter has the problem of being cumbersome to operate.

Also, if you directly ignite a main burner that is in a normal combustion state, there is a risk of explosion.

The present invention improves the problems of the prior art as described above, and in non-AC-controlled water heaters, etc., the main burner is ignited slowly so that there is no risk of explosion and ignition when the hot water tap is opened, and after ignition is completed, The object of the present invention is to provide a direct slow ignition device for water heaters, etc., which can automatically return the main burner to a normal combustion state.

[Means to solve the problem]

The present invention, in order to achieve the above objects,
When flowing water is detected, the water pressure automatic gas valve is opened and the water flow switch is closed, and when the water pressure automatic gas valve is opened, gas is supplied to the main burner via the gas governor, and the igniter is driven by the closing signal of the water flow switch. In water heaters and bathtubs with water heaters in which the flame is ignited and the presence of flame monitored by a flame rod, the push load of the pressure regulating spring of the gas governor is divided into a normal push load and a weak push load by a gear motor operated by a dry battery. 2
When the flame rod senses the presence of flame, it drives the gear motor in the normal push load direction, and when the push load reaches a set value, the gear motor is stopped, and the flame rod When the absence of the pressure is detected, the gear motor is driven in the direction of a weak push load, and when the push load reaches the set value, the gear motor is stopped. At the time of ignition, the push load of the pressure adjustment spring is weakened to throttle the gas supply amount, and after ignition, the gear motor is stopped. It is characterized in that it functions as a predetermined gas governor by increasing the amount of gas supplied.

[Effect]

Since the slow ignition device of the present invention is configured as described above, when the water heater is stopped and the flame rod detects that there is no flame, it automatically drives the gear motor to control the pressure regulating spring of the gas governor. Since the pushing load is weakened, the amount of gas supplied to the main burner is reduced during the next operation, allowing direct gentle ignition of the main burner. After igniting slowly in this way, when the flame rod detects the flame, it automatically drives the gear motor to return the push load of the gas governor's pressure adjustment spring to the set value.
Since it functions as a predetermined gas governor, the main burner can be burned in a normal state.

〔Example〕

Next, an example of implementation of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating the operating principle of a water heater equipped with a direct slow ignition device according to the present invention. In the figure, 1 is a hot water tap, 2 is a diaphragm case, 3 is a heat exchanger, and 4
is an orifice, 5 is a diaphragm, 6 is an operating spindle, 7 is a desk, 8 is a water flow switch, 9 is a hydraulic automatic gas valve, 10 is a control unit, 11 is a gas solenoid valve, 12 is a gas governor, 13 is a manifold, 1
4 is a main burner, 15 is an igniter, and 16 is a flame rod. When the hot water tap 1 is opened, water flows from the diaphragm case 2 through the heat exchanger 3. At this time, the pressure difference generated by the orifice 4 causes the water to flow through the diaphragm. 5 is displaced, and the desk 7 fixed in the middle of the operating spindle 6 moves to the diaphragm case side, turning on the water flow switch 8 and opening the hydraulic automatic gas valve 9. When the water flow switch is turned on, the signal is emitted. is input to the control unit 10, and at the same time as the gas solenoid valve 11 is opened, the gas is discharged from the igniter 15 and released from the main burner 14 via the gas solenoid valve 11, the hydraulic automatic gas valve 9, the gas governor 12, and the manifold 13. is configured to ignite. Note that the above configuration is a known technique for water heaters using pilot burners.

In the present invention, a second gas governor 12 is used as the gas governor 12.
The structure shown in detail in Figures A and B is used. That is, as is well known, the gas governor is connected to the gas inlet 3.
A valve seat 29 is formed in the middle of the valve housing 20 having a gas outlet 7 and a gas outlet 38, and the valve body 21 is suspended by a desk 24 fixed at the center of the diaphragm 22 facing the valve seat 29. A valve body spring 23 is interposed between the lower surface of the valve body spring 21 and the valve body spring seat 25, and the diaphragm 22 is pressurized by a pressure regulating spring 27 disposed in the valve cover 26 facing the valve body spring 23. The gas passage area between the valve body 21 and the valve seat 29 is automatically adjusted by the cooperation of the valve body spring 23 and the pressure regulating spring 27 according to the pressure of the supply gas flowing into the primary gas chamber 30 from the gas inlet 37. The gas pressure in the secondary gas chamber 31, ie, the amount of gas supplied, is kept constant.

In the present invention, the pushing load caused by the pressure regulating spring can be adjusted by a gear motor driven by a voltage as low as that of a dry battery. That is,
33 is a motor driven by a dry battery as a power source;
4 is a gear rotated by the motor, and 32 is a rack that meshes with the gear. These motors, gears, and racks constitute the gear motor 17, and the rack 32 is inserted into the valve cover 26. The pressure adjustment rod 28 is arranged so that it can be moved up and down.
The valve lid 26 is integrally or integrally combined with the valve lid 26.
An upper limit switch 35 and a lower limit switch 36 are disposed above and below the upper limit switch 35, and at the position where the pressure adjustment rod 28 is in contact with the upper limit switch 35, the pushing load of the pressure adjustment spring 27 is weakened as shown in FIG. 2A. When the motor 31 is stopped and the flame rod 16 senses a flame, the motor 33 is driven via the control section 10 based on the signal to lower the pressure adjustment rod 28, and the pressure adjustment rod 28 is lowered as shown in FIG. 2B. It is configured to automatically stop at the position where it abuts the lower limit switch 36, and to return the pushing load of the pressure regulating spring 27 at that time to the normal pushing load.

The direct slow ignition device of the present invention is constructed as described above, and when the water heater is not in use, the pressure regulating spring 27 shown in FIG. 2A is in a weakened position as will be described later.

In this state, when the hot water tap 1 is opened, the gas solenoid valve 11 and the water pressure automatic gas valve 9 are activated as described above.
Open the main burner 1 through the gas governor 12.
4 is supplied with gas, and the igniter 15 discharges a spark to ignite the main burner 14. At this time, the pressure adjustment rod 28 is in the position shown in FIG. The spring 27 is extended to the L dimension, its pushing load is weakened, and the gas passage area between the valve body 21 and the valve seat 29 is narrowed.
The amount of gas passing between the main burner 14 and the main burner 14 is small, and therefore the main burner 14 is ignited smoothly without explosion.

When the ignition of the main burner is completed as described above, the flame rod 16 detects the flame and sends a signal to the control unit 10 to continue combustion, and the signal drives the motor 33, which drives the gear 34. is rotated to lower the pressure adjustment rod 28 and compress the pressure adjustment spring 27. When the pressure adjustment rod 28 moves to a position where the lower limit switch 36 is pressed, a signal from the lower limit switch is input to the control unit 10, and the motor 33 is stopped at that position, thereby causing the pressure adjustment spring 27 to change from L to L. Compressed. The pushing load of the pressure regulating spring 27 at that time is adjusted in advance so that the gas flow rate passing through the secondary gas chamber 31 remains constant even if the gas pressure flowing into the primary gas chamber 30 fluctuates.
Since this functions as an original gas governor, the main burner 14 performs combustion using the original input of the water heater.

When extinguishing a fire, when the hot water tap 1 is closed, the water pressure automatic gas valve 9 is closed and the water flow switch 8 is turned off.
The off signal is input to the control section 10 to close the gas solenoid valve 11, and the flame rod 16 is turned off by extinguishing the fire. When the frame rod 16 off signal is input to the control section 10, the motor 33 is reversely rotated and the pressure adjustment rod 28 is turned off.
When the pressure adjustment rod 28 rises to the position where the upper limit switch 35 is pressed, an ON signal from the switch 4 is input to the control unit 10, and the motor automatically stops at that position, as shown in FIG. 2A.
Maintain the position shown in the figure below to allow slow ignition.

Although the embodiment described above uses a water flow switch operated by displacement of a diaphragm due to differential pressure, it is of course possible to use a water flow switch based on other operating principles.

〔Effect of the invention〕

As described above, according to the present invention, in non-AC-controlled water heaters, hot water was conventionally forced to be supplied by forming a pilot flame in the pilot burner and then transferring the flame to the main burner. With this invention, it is possible to directly ignite the main burner simply by opening the hot water tap, and when igniting, the ignition is carried out slowly so that there is no risk of explosion and ignition, and after ignition is completed, the main burner is automatically returned to the normal combustion state. It has the effect of being able to maintain

[Brief explanation of drawings]

Fig. 1 is a diagram showing the operating principle of an example of a water heater equipped with a direct slow ignition device of the present invention, Fig. 2A is a sectional view of main parts showing a state during slow ignition, and Fig. 2B is a normal combustion state. FIG. 1...Hot water tap, 2...Diaphragm case, 5
...Diaphragm, 6...Operating spindle, 7...
…Desk, 8…Water switch, 9…Water pressure automatic gas valve, 10…Control unit, 11…Gas solenoid valve,
12... Gas governor, 14... Main burner, 1
5...Igniter, 16...Frame rod, 1
7... Gear motor, 20... Valve housing, 21... Valve body, 22... Diaphragm, 23... Valve body spring,
26... Valve lid, 27... Pressure adjustment spring, 28... Pressure adjustment rod, 29... Valve seat, 30... Primary gas chamber, 31... Secondary gas chamber, 32... Rack, 33
...Motor, 34...Gear, 35...Upper limit switch, 36...Lower limit switch.

Claims (1)

[Claims] 1 When flowing water is detected, the water pressure automatic gas valve is opened and the water flow switch is closed, and when the water pressure automatic gas valve is opened, gas is supplied to the main burner via the gas governor, and the igniter is driven by the closing signal of the water flow switch. In water heaters and bathtubs with water heaters that are designed to ignite the flame and monitor the presence of flame using a flame rod, the push load of the pressure regulating spring of the gas governor is adjusted to normal push load and weak push load by a gear motor operated by a dry battery. configured so that it can be adjusted to two positions, and
When the flame rod detects the presence of flame, it drives the gear motor in the direction of the normal push load, and when the push load reaches a set value, it stops the gear motor, and when the flame rod senses the absence of flame, it drives the gear motor in the direction of the weak push load. When the gear motor is driven and its push load reaches a set value, the gear motor is stopped, and when ignited, the pressure adjustment spring's push load is weakened to throttle the gas supply amount, and after ignition, the gas supply amount is increased to function as a specified gas governor. A direct slow ignition device for a water heater, etc., characterized by: