JP3347627B2 - Gas water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of a gas water heater provided with a device for pushing and opening a magnet safety valve by water pressure.

[0002]

2. Description of the Related Art Generally, a gas safety device or the like is provided with a magnet safety valve for stopping the outflow of gas when a combustion flame is lost due to inaction. The presence or absence of combustion flame during combustion is monitored by flame guard or thermocouple electromotive force, etc.If there is combustion flame, the magnet safety valve is opened and held by the power of the dry cell, and in case of combustion flame disappearance The valve is closed by stopping the energization and releasing the valve opening holding force. In order to set the valve to open at the time of the ignition, it is necessary to have a pushing force as an auxiliary force for pushing the attracting surface of the magnet safety valve, and a pushing / opening operation to bring the magnet safety valve into a valve closeable state after the attraction. It is known that the pushing force is based on human pressure or other electromagnetic force, as well as using water pressure.

[0003] An apparatus utilizing the water pressure is disclosed by the present applicant in Japanese Utility Model Laid-Open No. 4-1789.
As an example, a valve opening device for a magnet safety valve incorporated in a gas water heater will be described with reference to FIG. For the gas water heater in which the valve opening device is incorporated, see the embodiment of the present invention in FIG.

First, referring to FIG. 1, when the operation button 24 is pressed, the faucet 10 is opened to start water flow. The water passes through the heat exchanger 1 via the hydraulic pressure response device 16 and exits from the hot water outlet 23. When water is passed, the water pressure response device 16
A differential pressure is generated between the primary chamber and the secondary chamber, and a displacement force is generated in the diaphragm 6 that can freely move. The spindle 37 is on the same axis as the water side shaft 14 and the water pressure responsive device 16, and is urged by the spring 27 in the downstream direction (rightward in the figure). When the displacement force overcomes the force of the spring 27, the spindle 37 is displaced to the left in the drawing. The displacement amount is the spindle 37 in contact with the water side shaft 14.
Then, the magnet safety valve 7, the valve opening device 8, and the automatic water pressure valve 30 described later are operated.

The magnet safety valve 7 is provided in a valve chamber 13 on the upstream side of the gas passage. One end of the valve shaft 36 has a spring 4
The valve body 43 biased in the closing direction by 5 is provided so as to be able to contact and separate from the seat portion 35 of the main body. At the other end of the valve shaft 36, an attraction piece 46 is provided to face the attraction surface 47 of the electromagnet.

Downstream of the magnet safety valve 7, a valve opening device 8 is arranged on the same axis as facing the magnet safety valve 7, and a spindle 37 for transmitting the displacement of the hydraulic pressure responsive device 16.
Coaxially inserted into the tip of The valve opening device 8 engages with the spindle 37 until the magnet safety valve 7 is opened and suction is performed, and moves integrally. After the magnet safety valve is completely opened, the engagement with the spindle 37 is released, and the magnet safety valve is opened. 7 retreats by sliding on the spindle 37 to a position where the valve can be closed. When the flow of water is stopped, the spindle 37 is returned to the initial stop position by the hydraulic pressure response device 16, and the valve opening device 8 and the spindle 37 are engaged and returned.

A water pressure automatic valve 30 slidably inserted into a spindle 37 is provided downstream of the valve opening device 8, and is biased by a spring 33 so as to close in the downstream direction. The contact with and separation from the valve element 43 causes the second
Is formed. The spindle 37 is provided with a push member 29 for opening the automatic hydraulic valve 30. After the opening of the magnet safety valve 7 is completed and the engagement between the spindle 37 and the valve opening device 8 is released, the automatic hydraulic valve 30 is pushed by the pushing member 29 of the spindle 37 and is opened. When the hydraulic automatic valve 30 is opened by the spindle 37, the gas flows to the burner, and the gas is ignited by the discharge of the igniter 51 and combustion starts.

Next, the operation steps of the valve opening device 8 will be described with reference to FIG. When the water heater is started to operate and water is passed, a displacement force is transmitted to the water-side shaft 14 of the water pressure response device 16. For this reason, the spindle 37 is
It overcomes seven forces and is displaced integrally with the water side shaft 14. The valve opening device 8 starts pushing the magnet safety valve 7 from the stop position (state A) due to the displacement of the spindle 37 and starts valve opening (state B). Further, the spindle 37 is
Attachment piece 46 of magnet safety valve 7 to electromagnet attraction surface 47
(C state).

Subsequently, when the spindle 37 is displaced, the engagement between the valve opening device 8 and the spindle 37 is released by the displacement force, and the valve opening device 8 retreats while sliding on the spindle 37 (from the state of D). E state), magnet safety valve 7
Release the pushing motion. The release of the pushing force is caused by the fact that the engagement portion between the ball 40 and the concave portion 41 of the spindle 37 is released. When the spindle 37 is further displaced to the left in the figure (state F), the water pressure automatic valve 30 is pushed by the pushing member 29 integrated with the spindle 37 and opens to start gas flow.

When the fire extinguishing operation is performed by the operation button 24, the faucet 10 closes and stops water. Then, the hydraulic response device 16
The differential pressure between the primary chamber and the secondary chamber of the diaphragm 6 disappears, and the force of the spring 27 starts returning the spindle 37 to the stop position (rightward in the figure). When the spindle 37 retreats and closes the return hydraulic pressure automatic valve 30 and then retreats to near the stop position, the valve opening device 8 and the spindle 37 are re-engaged to prepare for the next ignition. (The state in which the pushing ability has been recovered by this re-engagement is hereinafter referred to as reset.)

[0011]

However, when the above-described valve-opening device, which is a mechanism for opening the magnet safety valve by water pressure, is used, in practice, the adsorption / holding current to the magnet safety valve, the discharge of the igniter, A unique problem arises with respect to frame guard control.

For example, the discharge of the igniter accompanying the ignition operation, the flame detection of the frame guard, and the energization of the attracting current to the magnet safety valve require insufficient time to open the magnet safety valve 7 and the automatic water pressure valve 30 due to insufficient water pressure. It is necessary to assume a case. Therefore, in order to perform combustion without any trouble even in the use state of low water pressure, it is necessary to assume the longest time of the valve opening time of each valve in advance and start them for an unnecessary time from the beginning of the ignition operation, This involves unnecessary use of power and is not an efficient control. Therefore, it is desired to perform necessary control corresponding to opening and closing of each valve in each operation step.

Next, the valve-opening device must be operated in consideration of various use situations, so as not to inconvenience a particularly rapid repetitive operation. If the ignition operation is performed immediately after the fire extinguishing operation, the fire is extinguished by closing the automatic hydraulic valve, but the operation may shift to the ignition operation in a state where the spindle does not return completely and the valve opening device is not reset. The fact that the valve opening device is not reset means that there is no ability to open the magnet safety valve and move it to the suction position because the engagement is released. Therefore, in order to normally ignite and burn even in a quick repetitive operation, it is necessary to control the energization of the magnet safety valve, and to control the discharge of the igniter for ignition when the automatic hydraulic valve is restarted.

The gas water heater of the present invention solves the above-mentioned problems,
An object of the present invention is to provide a safe water heater that makes effective use of the power of a dry battery and is not inconvenienced in various use states.

[0015]

In order to solve the above-mentioned problems, a gas water heater according to the present invention opens a magnet safety valve and a water pressure automatic valve provided in a gas flow path by a spindle which moves forward and backward in accordance with water pressure. A valve for opening a magnet safety valve at the tip of the spindle, and a push member for pushing an automatic hydraulic valve at an intermediate position of the spindle; When the spindle advances in the valve opening direction of the magnetic safety valve due to the flow of water, an engagement maintaining mechanism for maintaining the engagement state between the spindle and the valve-opening device; A disengagement mechanism that uses power to disengage the spindle from the valve-opening device so that the magnet safety valve can be closed, and a spin-off mechanism after the magnet safety valve is completely opened. After engagement of the dollars and the valve opening device is solved, and the opening sequence ensuring mechanism pushes open the hydraulic automatic valve by pressing member provided on the spindle, opening push the water pressure automatic valve
Discharge means for starting a burner ignition discharge before being burned;
A reset mechanism for re-engaging the spindle and the valve opening device during the retraction of the spindle due to the stoppage of the water supply of the gas water heater, and the magnet at the advance / retreat position of the spindle.
The first switch that operates near the position where the safety valve starts opening
And the water pressure automatic at the advance / retreat position of the spindle.
A second switch that operates near the position where the valve starts to open.
Equipped with the above spindle at the start of water flow by ignition operation
During the forward, the first to detect the actuation of the switch to start the power supply to the magnet <br/> preparative safety valve, energizing start of holding means for opening holding the magnet safety valve by electromagnetic force, the second Sui
The discharge hand after a predetermined time has elapsed from the detection of the operation of the pitch
And a discharge control means for stopping the discharge by the step .

Further, a gas water heater according to a second invention is the gas water heater according to the first invention, wherein the operation of the first switch is performed.
The gist of the present invention is to start the ignition discharge of the burner upon detection .

Further, the gas water heater according to the third invention is the gas water heater according to the first invention, wherein the operation of the second switch is performed.
The gist of the present invention is to provide a magnet safety valve current switching means for switching the energization to the magnet safety valve to a low level current sufficient for holding the valve open based on the current.

The gas water heater according to a fourth aspect of the present invention is the gas water heater according to the first aspect, wherein the second switch is operated.
The gist of the invention is to provide a flame guard operation start means for starting flame detection by the flame guard based on the flame guard. Ma
Further, the gas water heater according to the fifth aspect of the present invention provides any one of the first to fourth aspects.
In the gas water heater according to the invention, the water flow is stopped by the stop operation.
When the spindle is retracted due to stopping, the second switch
Energizes the magnet safety valve after a predetermined time has passed since the
Means for stopping power supply and the reset mechanism.
When the pindle and the valve opening device are re-engaged, the gas water heater
Control termination means for terminating all control operations of
And the summary.

[0019]

In the gas water heater of the present invention having the above structure, when water is supplied by the ignition operation, the spindle is first displaced, and at this time, the valve opening device and the spindle are engaged by the engagement maintaining mechanism. Therefore, this displacement pushes and opens the magnet safety valve. Near where this magnet safety valve starts to open
The position activates the first switch. Thereafter, the engagement between the two is released by the displacement force of the spindle, and the magnet safety valve is brought into a valve-closable state. Further, when the spindle is displaced, the automatic hydraulic valve is opened. Near when the automatic hydraulic valve starts to open
The second switch is activated in the side position. When the flow of water is stopped by the fire extinguishing operation, the spindle retreats to close the hydraulic automatic valve, the spindle retreats again, and the spindle and the valve opening device re-engage to prepare for the next ignition. At the time of this ignition operation, the operation of the first switch is detected to start energization of the magnet safety valve, generate an electromagnetic force, and hold the valve open. Therefore,
When the magnet safety valve is opened and pressed, a current reliably flows and the magnet safety valve is kept open. Also water
The ignition discharge of the burner is started before the pressure automatic valve is pushed open, and after a predetermined time has elapsed since the operation of the second switch is detected.
In addition, since this discharge is stopped, the discharge time required for ignition can be ensured even if the opening of the automatic hydraulic valve is delayed due to the influence of the hydraulic pressure or the like.

Further, gas water heaters of the second invention, the server
The ignition discharge of the charger is opened by detecting the operation of the first switch.
Start, that is, near the opening start position of the magnet safety valve.
Start, the explosion occurs even if the automatic
Ignition and ignition can be prevented.

Further, the gas water heater of the third invention is provided with a second steam generator .
Opening of the automatic hydraulic valve based on the operation of the switch
In the vicinity of the starting position , the power supply to the magnet safety valve is switched to a low-level current sufficient for holding the valve open, so that the power of the limited dry battery can be saved.

Further, the gas water heater of the fourth invention is provided with a second switch .
Since flame detection is started by the frame guard based on the operation of the switch, the start of gas flow, that is, the time of ignition and the start of flame detection operation can be the same, and the limited dry battery power can be used effectively. And secure flame detection. Further, the gas water heater of the fifth invention is
In addition, at the time of the stop operation, a predetermined time elapses after the operation of the second switch.
Since the magnet safety valve is de-energized after an error,
The valve opening device rotates the pushing force during re-ignition in repeated operation.
Leave the magnetic safety valve open even if it has not been restored
be able to. Therefore, re-ignition operation by fast repetition operation
The work can be performed without any trouble. Also, reset mechanism
When the spindle and valve opening device are re-engaged by
Since all control operations of the water heater are completed,
It can be stopped in the prepared state.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of a gas water heater of the present invention will be described below. FIG. 1 is a schematic diagram of a gas water heater as one embodiment. The feature of this gas water heater is that two switches 21 and 22 interlocked with the spindle 37 are provided, and the ignition control and the fire extinguishing control are performed based on the signals thereof. Since it is the same as the conventional one, the description of the above-described conventional technique will be omitted.

FIG. 2 is a block diagram of the switch operating section according to the present invention. The water-side shaft 14 transmits a displacement force generated in the water pressure responsive device 16 to the spindle 37 by passing water. One end of the spindle 37 is in contact with the water shaft 14 of the water pressure responsive device 16 and receives a displacement force, and is urged rightward by a spring 27 provided coaxially. The water pressure responsive device 16 has no displacement force during the stoppage of water flow, and the spring 2
7, the spindle 37 is returned rightward to the original stop position. A projection for operating the first switch 21 and the second switch 22 is provided on the outer periphery of the receiving portion of the spindle 37 with the water side shaft 14, and corresponds to the position when the spindle 37 is displaced on the axis. Switch is ON
/ OFF to detect the position.

The operation timing and operation of the first switch 21 and the second switch 22, which are two switches that operate according to the displacement of the spindle 37, will be described with reference to the time chart of FIG.

First, the opening and closing sequence of each valve and its operation will be described. (Note that the components of each part are shown in FIG. 1.) At the time of the ignition operation, the hydraulic pressure responsive device 16 is actuated by flowing water, and the spindle 37 is displaced until the automatic hydraulic pressure valve 30 is opened. The respective valves are sequentially opened in accordance with the movement of the spindle 37 at the time of the ignition as follows. First, the valve opening device 8 provided on the spindle 37 starts pushing the magnet safety valve 7. In the position where the valve opening device 8 pushes and opens the magnet safety valve 7, the spindle 37 is still in the automatic hydraulic pressure valve 3.
0 is set not to open. After the magnet safety valve 7 is opened and pressed (after the valve opening is completed), the valve opening device 8 is disengaged from the spindle 37 by its displacement force, slides back on the spindle 37, and releases the pushing. At this time,
The magnet safety valve 7 maintains the suction open state by energization described later, and enters the valve closeable state by retreating the valve opening device 8. The displacement of the spindle 37 causes the automatic hydraulic valve 3
0 starts to open. When the water pressure automatic valve 30 opens, the gas becomes
The burner 4 reaches the burner 4 and is ignited by the discharge of the igniter 51 to start burning. During the combustion, the combustion controller 48 monitors the flame and the combustion abnormality by the frame guard 50 or the thermocouples 49 and 3. If there is an abnormality, the power supply to the magnet safety valve 7 is stopped and the valve is closed.

Next, in the fire extinguishing operation, the water pressure response device 16 loses the displacement force due to the water stoppage, and the spindle 37 returns to the initial stop position by the spring 27. The valves are sequentially closed in accordance with the movement of the spindle 37 during the fire extinguishing. During the fire extinguishing operation, the energization of the magnet safety valve 7 from the combustion controller 48 is stopped at a predetermined timing, and the magnet safety valve 7 is closed. When the spindle 37 is retracted, the automatic hydraulic valve 30 is first closed, and when the spindle 37 is retracted and approaches the stop position, the valve opening device 8 causes the spindle 3 to retract.
7 to the stop position.

Next, energization of the magnet safety valve 7 at the time of such ignition / extinguishing, flame detection of the frame guard 50,
The discharge control of the igniter 51 will be described. For this control, two sets of switches 21 and 22 are used. The two switches are turned on / off in response to a change in the spindle 37 by a projection provided on the spindle 37, and detect four positions from a first detection position to a fourth detection position described later. The first detection position and the second detection position are detected while the spindle 37 moves in the valve opening direction due to the ignition operation.
Further, the third detection position and the fourth detection position are detected while the spindle 37 is returning to the initial stop position by the fire extinguishing operation.

Based on the timing of the detection signal, the combustion controller 48 turns on / off the attraction and holding current of the magnet safety valve 7, discharges the igniter 51 for ignition,
The operation of the flame guard 50 for detecting the flame is controlled.

First, the first detection position will be described. The first detection position is detected by the ON operation of the first switch 21 and is set at the valve opening start position of the magnet safety valve 7. Specifically, the ON position of the first switch 21 is set to a position immediately before the start of the opening of the magnet safety valve 7. When the first switch 21 is turned on, the combustion controller 48 energizes the magnet safety valve 7 and starts discharging the igniter 51.

The ON detection position of the first switch 21 is set to the position before the start of opening the magnetic safety valve 7, and the magnet safety valve 7 is energized to operate the igniter 51 for the following reason. In order to ensure that the magnetic safety valve 7 is opened and held, a current is supplied from when the valve opening device 8 opens and pushes the magnet safety valve 7 to when the engagement between the spindle 37 and the valve opening device 8 is released (depressed). This is because it is necessary to shed. The magnet safety valve 7 needs an assisting force to press the suction piece 46 against the suction surface 47,
The displacement force of the water pressure responsive device 16 is used to open the magnet safety valve 7 via the valve opening device 8 and to attach the suction piece 46 to the suction surface 4.
Press on 7. If electricity is supplied to the magnet safety valve 7 from the combustion controller 48 before pressing, an electromagnetic force is generated on the suction surface 47 by the power of the dry battery, and the force is overcome by the spring 45 force of the magnet safety valve 7 and connected to the suction piece 46. The opened valve element 43 is kept open. Therefore, even if the suction piece 46 is pressed against the suction surface 47 and energized after being released, the valve does not open, so it is necessary to energize before pressing and releasing, and the magnet safety valve 7 starts opening before the magnet safety valve 7 is pressed by the spindle 37. Start energization at the position.

As for the start of the discharge of the igniter 51, the discharge is started from the start of the opening of the magnet safety valve 7 in order to enhance safety. Hereinafter, the reason will be described. Normally, when the magnet safety valve 7 is pushed and opened, the automatic water pressure valve 30 is closed, so that gas does not flow out and no discharge is required. In this state, when the safety valve 7 starts to open, gas starts to flow to the burner 4.
For example, this is a case in which the water pressure automatic valve 30 fails to close due to damage to the seat portion or biting of dust.

The valve closing abnormality of the automatic water pressure valve 30 may be caused by a further low water supply pressure or by the spindle 37.
If the sliding resistance of the spindle 37 is large and the movement of the spindle 37 is slow, it takes time for the movement of the spindle 37 from the opening of the magnet safety valve 7 to the opening of the automatic hydraulic valve 30.
The abnormal gas release time will be prolonged. Therefore, in this case, if the hydraulic pressure automatic valve 30 is opened, the igniter 5
If the discharge of 1 is performed, when the magnet safety valve 7 is opened, the gas is discharged to a place where gas is already flowing, and there is a risk of explosion ignition. Therefore, even when the automatic hydraulic valve 30 has a valve closing problem, the discharge is started not from the open position of the automatic hydraulic valve 30 but from the magnet opening position in order to flow gas to the place where discharge is occurring and to safely ignite. This is performed from the opening start position of the safety valve 7.

Next, the second detection position will be described. The second detection position is detected by the ON operation of the second switch 22, and the automatic hydraulic pressure valve 30 after the magnet safety valve 7 is depressed is released.
Is set to the valve opening start position. More specifically, the ON detection position of the second switch 22 is set to a position immediately after the opening of the automatic hydraulic pressure valve 30 is started. When the second switch 22 is detected to be ON, the combustion controller 48 switches the attracting current to the magnet safety valve 7 to the holding current and starts counting of a timer for determining the timing of stopping the discharge of the igniter 51 for the following reason. At the same time, the frame guard 50 is operated according to a sequence described later.

The reason for switching to the holding current is to save a limited amount of power which is a dry cell power supply. It utilizes the hysteresis characteristics of the electromagnet of the magnet safety valve 7 that once attracted, the magnetic flux density does not change much at lower currents. In other words, since the valve opening start position of the hydraulic automatic valve 30 is a position where the valve opening has already been completed by the electromagnetic force due to the energization of the magnet safety valve 7, a low level holding current sufficient to hold the magnet safety valve 7 open. It is switched to. (Hereinafter, the high-level current before switching is referred to as an attracting current, and the current after switching to a low level is referred to as a holding current.)

The reason why the stop timer of the igniter 51 is operated at the valve opening position of the automatic hydraulic valve 30 is to secure a discharge time of a certain time or more from the start of gas release and to perform reliable ignition. In other words, the stop timer of the igniter 51 should stop the igniter 51 after a sufficient discharge for ignition. Therefore, the stop timer is activated from the time when gas starts to be discharged (opening of the automatic water pressure valve 30) and stopped after a predetermined discharge. By doing so, it is possible to secure a necessary discharge time when gas is emitted.

The flame detection by the frame guard 50 is activated at the opening position of the automatic hydraulic valve 30 when the gas starts to flow. The valve opening position of the automatic hydraulic valve 30 is a position where combustion is started, and is therefore optimal as a position for starting flame detection. When flame detection by the frame guard 50 is started, monitoring is performed for a maximum of T1 until it is confirmed that a flame exists. Next, when it is confirmed that there is a flame, pause once, and T2
After the elapse of time, the maximum T until the flame is confirmed again
Monitor for 3 hours. If it can be confirmed again that there is a flame, the flame guard 50
Switching to electromotive force detection by 9.3. In addition, the above T1
If there is no flame during the monitoring time T3 or the monitoring time T3, the combustion controller 48 stops energizing the magnet safety valve 7 and closes it.

The reason for switching from flame detection by the frame guard 50 to electromotive force detection by the thermocouples 49 and 3 is that the thermocouples 49 and 3 are heated after ignition in order to generate electromotive force by combustion heat. This is because a transient time is required until the operation becomes stable. The flame guard 50 detects the flame by using the rectifying effect of the flame, and the operation of the flame guard 50 for a long time increases the consumption of dry battery power, which is limited power. Therefore, switching from flame detection by the frame guard 50 to electromotive force detection by the thermocouples 49 and 3 is performed.

Therefore, when the automatic hydraulic valve 30 starts to be opened, gas starts to be emitted, and is ignited by the discharging igniter 51, the stop timer of the igniter 51 is operated, and after a lapse of a predetermined time, the igniter 51 is stopped.
From the detection by the thermocouple 49 to the detection by the thermocouple 49.
When a predetermined time or more elapses from the opening of the magnet safety valve 7 to the opening of the automatic hydraulic pressure valve 30, the combustion controller 48 determines that the state is particularly abnormal and determines that the magnet safety valve 7 is open.
The energization of the gas is stopped and the valve is closed to shut off the gas flow path.

Next, the third detection position and the fourth detection position will be described. The third detection position is the OFF state of the second switch 22
It is detected by the operation, and is set to a substantially closed position of the automatic hydraulic valve 30. Further, the fourth detection position is determined by the O of the first switch 21.
It is detected by the FF operation and set at the reset position of the valve opening device 8. More specifically, the OFF position of the second switch 22 is set to a position immediately before the automatic hydraulic pressure valve 30 is closed. Further, the OFF operation position of the first switch 21 is set close to the reset position of the valve opening device 8 to the stop position side.

O of the first switch 21 and the second switch 22
The FF operation timing and its operation are performed during the fire extinguishing operation. When the fire extinguishing operation is performed and the faucet is closed, the spindle 37 stops in the stopping direction (rightward in the drawing) by the action of the hydraulic pressure response device 16.
And the automatic hydraulic pressure valve 30 is closed. At the position immediately before the closing of the automatic hydraulic valve 30, the second switch 22 is turned off.
After the F operation, the spindle 37 returns to near the stop position to reset the valve opening device 8, and further returns to turn off the first switch 21 to reach the stop position.

The combustion controller 48 includes the automatic hydraulic valve 30
When the second switch 22 is turned off almost simultaneously with the completion of the valve closing, the timer (described later) for setting the timing at which the holding current to the magnet safety valve 7 is turned off starts counting. When the first switch 21 is turned off, all the controls are stopped.

Here, the valve opening device 8 for pushing and opening the magnet safety valve 7 using the water pressure will be described. The function of the valve opening device 8 is to push the valve open and push the valve open to the suction position, thereby releasing the pressing force (release of the pressure) and making the magnet safety valve 7 free to close. Therefore, in order to recover the pressing ability in preparation for the next ignition operation, it is necessary to perform engagement between the spindle 37 and the valve opening device 8, that is, to reset the valve opening device. The reset position is performed at a position close to the stop position where the spindle 37 is further returned after the automatic hydraulic pressure valve 30 is closed.

Next, looking at the valve opening device 8 in consideration of various usage conditions, for example, when the ignition operation is performed immediately after the fire extinguishing operation, the ignition operation is performed without returning the spindle 37 to the reset position of the valve opening device 8. At this time, since the valve opening device 8 has not been reset, the magnet safety valve 7 is not reset.
Has no ability to open the valve and move it to the suction position.

Therefore, in order to operate the appliance without any problem even in a fast repetitive operation, the fire extinguishing operation causes the spindle 37 to return to the stop direction, and even if the water pressure automatic valve 30 is first closed and the fire is extinguished, the magnet safety valve 7 is immediately turned off. Instead of turning off the holding current, after the spindle 37 returns to the reset position of the valve opening device 8, the magnet safety valve 7
Turning off the holding current can solve the problem in use. However, when the above method is adopted, new problems, for example, when the sliding resistance of the spindle 37 is large and the spindle 37 does not return, and when the seat portion of the automatic hydraulic valve 30 is damaged or dust is bitten. If the valve is not closed properly, the magnet safety valve 7 is kept open and gas continues to be emitted, which is inconvenient.

Therefore, the timer for turning off the holding current of the magnet safety valve 7 is detected by detecting the third position, which is the position immediately before the closing of the automatic hydraulic valve 30, and the fourth position, which is the reset position of the valve opening device 8, is started. The position is detected and all controls are turned off. Therefore, the spindle 37 starts to return due to the fire extinguishing operation, the automatic detection of the second switch 22 is detected, the automatic hydraulic valve 30 is closed, and the combustion controller 48 starts a timer for turning off the holding current of the magnet safety valve 7. Further, even if a predetermined time elapses after the timer starts counting, the first switch 21 is turned off after the reset position of the valve opening device 8.
If it does not reach the detection position, it is determined that the spindle 37 is returning abnormally, and the holding current of the magnet safety valve 7 is turned off.
By closing the magnet safety valve 7, the inconvenience is eliminated.

The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

For example, projections which are integral with the spindle 37 and are switch-operating actuators are provided at respective positions to distinguish between ignition and fire extinguishing, and to turn on / off one switch.
Each position can be freely detected by turning it off. In addition, the first detection position and the fourth detection position are the same,
Assuming that the second detection position is the same as the third detection position, the position can be set within the hysteresis between the ON and OFF states of the switch, and each position can be freely detected by one switch in distinction between ignition and extinguishing. Further, the switch is not limited to a mechanical switch but can be replaced by various switches such as an optical switch and a magnetic switch.

[0049]

As described in detail above, according to the gas water heater of the present invention, when the magnet safety valve is opened and pressed, a holding current flows reliably and the magnet safety valve is opened and held. The usability in use etc. is improved. Ma
In addition, the discharge time required for ignition can be reliably secured, and safety can be improved.

[0050] Further, the gas water heater of the second invention, the water pressure itself
Explosion ignition can be prevented even if a valve closing error occurs.
And safety is further improved.

Further, the gas water heater according to the third aspect of the invention can save a limited amount of power of the dry battery.

In the gas water heater according to the fourth aspect of the present invention, the flame detection of the frame guard can be performed in accordance with the opening timing of the automatic hydraulic valve, so that the safety and the efficiency of use of electric power by the dry battery are greatly improved. Can be improved. Ma
Further, the gas water heater according to the fifth aspect of the present invention can be used in a fast repetitive operation.
The re-ignition operation can be performed without any trouble, and
Can be stopped in preparation for ignition, so win
Hands improve.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a water heater as one embodiment.

FIG. 2 is a configuration diagram of a switch operation unit according to the embodiment of the present invention.

FIG. 3 is an operation diagram of a valve opening device for a magnet safety valve as one embodiment.

FIG. 4 is a time chart according to a spindle position according to the embodiment of the present invention.

[Explanation of symbols]

 7 Magnet safety valve 8 Valve opening device 16 Water pressure response device 21 First switch 22 Second switch 30 Automatic water pressure valve 37 Spindle

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24H 1/10 303 F23N 5/24 F23N 5/26

Claims (5)

(57) [Claims] 1. A gas water heater for opening a magnet safety valve and an automatic water pressure valve provided in a gas flow passage by a spindle which moves forward and backward in accordance with a water passing pressure, wherein a magnet safety valve is provided at a tip end of the spindle. A push-opening device for pushing and opening the water pressure automatic valve is provided at an intermediate position of the spindle, and the spindle and the spindle are moved forward in the valve opening direction of the magnet safety valve by the flow of the gas water heater. An engagement maintaining mechanism for maintaining an engaged state with the valve opening device; and after completion of opening of the magnet safety valve by advancing the spindle, the advancement power is used to release the engagement between the spindle and the valve opening device to release the magnet safety valve. An engagement release mechanism for bringing the spindle into a valve-closable state; and after disengaging the spindle from the valve-opening device after the magnet safety valve is completely opened, And opening sequence ensuring mechanism pushes open the hydraulic automatic valve by pressing member which is provided, discharge ignition of the burner before the water pressure automatic valve is pushed open
And discharge means for initiating a halfway retracted spindle by stopping feeding water of the gas water heater, and a reset mechanism for re-engaging the spindle and the valve opening device, the magnet security in forward and backward position of the spindle
A first switch that operates at a position near the start of opening of the valve, and an automatic hydraulic valve that opens and closes when the spindle advances and retreats.
And a second switch operating at a position near the starting valve during advancement of the spindle due to the water passing the start by the ignition operation
To, the first to detect the actuation of the switch to start the energization of the magnet safety valve, electric energizing start of holding means for the open-valve state hold a magnet safety valve by magnetic force, a predetermined time from the detection of the operation of the second switch And a discharge control means for stopping discharge by said discharge means after a lapse of time. 2. An operation of the first switch is detected, and
Serial gas water heaters according to claim 1, wherein initiating a wear fire discharge of the burner. 3. A magnet safety valve current switching means for switching the energization of the magnet safety valve to a low level current sufficient for holding the valve open based on the operation of the second switch. Item 2. A gas water heater according to Item 1. 4. The gas water heater according to claim 1, further comprising a frame guard operation start means for starting flame detection by the frame guard based on the operation of the second switch . 5. The above-described spinning method according to a stoppage of water flow due to a stop operation.
When the dollar retreats, After a predetermined time has passed since the operation of the second switch, the magnet
(G) means for stopping power supply to the safety valve, The spindle and valve opening device are re-engaged by the above reset mechanism.
When combined, end all control operations of gas heater
2. The control device according to claim 1, further comprising control termination means.
The gas water heater according to claim 4.