JPH0741244U - Gas water heater - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the safety, convenience of use, and battery power utilization efficiency of the water heater by confirming and controlling the position of each operation step. [Structure] Energization control of the igniter 51, the frame guard 50, the electromagnetic safety valve 7, etc. by detecting the opening / closing positions of the electromagnetic safety valve 7 / hydraulic automatic valve 30 and the reset position of the valve opening device 8 by the first switch 21 and the second switch 22. Do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to control of a gas water heater equipped with a device for pushing and opening a magnet safety valve by water pressure.

[0002]

[Prior art]

 In general, gas appliances are equipped with a magnet safety valve that stops the outflow of gas when the combustion flame disappears randomly. The presence or absence of combustion flame during combustion is monitored by flame guards or electromotive force of thermocouple due to heat.If there is combustion flame, the magnet safety valve is held open by the power of the dry cell and the combustion flame disappears. Closes the valve by stopping energization and releasing the valve holding force. In order to set the valve to open at the time of ignition, it is necessary to use a pushing force as an auxiliary force that pushes against the adsorption surface of the magnet safety valve, and a push-release operation that allows the magnet safety valve to close after adsorption. It is known that pushing force is generated by human power or other electromagnetic force, as well as by utilizing water pressure.

The use of the water pressure is disclosed by the applicant of the present application in Japanese Utility Model Application Laid-Open No. 4-1789. As an example, FIG. 3 shows an opening device of a magnet safety valve incorporated in a gas water heater. It demonstrates using. For the gas water heater incorporating the valve opening device, refer to the embodiment of the present application shown in FIG.

First, referring to FIG. 1, when the operation button 24 is pressed, the faucet 10 is opened to start passing water. Water passes through the water pressure response device 16, passes through the heat exchanger 1, and exits from the hot water outlet 23. When water is passed, the hydraulic response device 16 generates a differential pressure between the primary chamber and the secondary chamber of the diaphragm 6 to generate a displacement force on the freely displaceable diaphragm 6. The spindle 37 is on the same axis as the water side shaft 14 and the hydraulic pressure responding device 16, and is urged by a spring 27 in the downstream direction (rightward in the drawing). When the displacement force overcomes the force of the spring 27, the spindle 37 is displaced leftward in the figure. The amount of displacement is transmitted to the spindle 37 that is in contact with the water side shaft 14, and actuates a magnet safety valve 7, a valve opening device 8, and a hydraulic automatic valve 30 which will be described later.

The magnet safety valve 7 is provided in the valve chamber 13 on the upstream side of the gas passage. A valve element 43 biased in a closing direction by a spring 45 is provided at one end of the valve shaft 36, and can be brought into contact with or separated from a sheet portion 35 of the main body. A suction piece 46 is provided at the other end of the valve shaft 36 and faces the suction surface 47 of the electromagnetic stone.

A valve opening device 8 is arranged downstream of the magnet safety valve 7 so as to face the magnet safety valve 7 on the same axis line, and is coaxially inserted into a tip end of a spindle 37 for transmitting the displacement of the water pressure responsive device 16. . The valve opening device 8 engages with the spindle 37 to move integrally with the magnet safety valve 7 until the magnet safety valve 7 is opened, and after the magnet safety valve is completely opened, the engagement with the spindle 37 is released to release the magnet safety valve. 7 slides on the spindle 37 to the position where the valve can be closed and retracts. When the water flow is stopped, the hydraulic responsive device 16 causes the spindle 37 to return to the initial stop position and the valve opening device 8 and the spindle 37 are engaged and returned.

A hydraulic automatic valve 30 slidably inserted in a spindle 37 is provided downstream of the valve opening device 8 and is biased by a spring 33 so as to be closed in the downstream direction. The second valve chamber 17 is formed in the section with the valve body 43 by contacting and separating with. The spindle 37 is provided with a pushing member 29 for opening the hydraulic automatic valve 30. After the opening of the magnet safety valve 7 is completed and the spindle 37 is disengaged from the valve opening device 8, the hydraulic automatic valve 30 is pushed by the pushing member 29 of the spindle 37 to be opened. When the hydraulic automatic valve 30 is opened by the spindle 37, the gas flows to the burner, and the discharge of the igniter 51 ignites the gas to start combustion.

Next, each operation step of the valve opening device 8 will be described with reference to FIG. The displacement force is transmitted to the water side shaft 14 of the water pressure responding device 16 by starting the operation of the water heater and passing water. Therefore, the spindle 37 overcomes the force of the spring 27 and is displaced together with the water side shaft 14. When the spindle 37 is displaced, the valve opening device 8 starts pushing the magnet safety valve 7 from the stop position (state A) and starts opening the valve (state B). Further, the spindle 37 pushes the attraction piece 46 of the magnet safety valve 7 to the attraction surface 47 of the electromagnet (state C).

Subsequently, when the spindle 37 is displaced, the displacement force disengages the valve opening device 8 from the spindle 37, and the valve opening device 8 slides on the spindle 37 and retracts (state D). To the state E), the pushing force to the magnet safety valve 7 is released. The release of the pushing force is due to the disengagement of the engaging portion between the ball 40 and the recess 41 of the spindle 37. When the spindle 37 is further displaced to the left side in the figure (state F), the hydraulic automatic valve 30 is pushed and opened by the pushing member 29 integrated with the spindle 37, and the gas starts to flow.

When a fire is extinguished by the operation button 24, the water faucet 10 is closed to stop the water. Then, in the hydraulic actuator 16, the pressure difference 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 to close the return hydraulic automatic valve 30 and then retracts 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 force is restored by this re-engagement is hereinafter called reset.)

[0011]

[Problems to be solved by the device]

 However, when the above-mentioned valve opening device, which is a mechanism that opens the magnet safety valve by water pressure, is used, the magnet safety valve actually has a characteristic of energizing adsorption / holding current, discharging the igniter, and controlling the frame guard. The problem arises.

For example, the discharge of the igniter due to the ignition operation, the flame detection of the flame guard, and the energization of the adsorption current to the magnet safety valve are insufficient until the magnetic safety valve 7 and the automatic hydraulic pressure valve 30 are opened due to insufficient water pressure. It is necessary to assume that it will take time. Therefore, in order to burn without trouble even under the condition of low water pressure, it is necessary to predict the maximum opening time of each valve in advance and start them for an unnecessary time from the initial ignition operation. However, it involves unnecessary consumption of electric power and is not an efficient control. Therefore, it is desirable to carry out each necessary control corresponding to the opening and closing of each valve in accordance with each operation step.

Next, the valve opening device must be operated in consideration of various situations of use so as not to cause inconvenience particularly in rapid repeated operation. If the ignition operation is performed immediately after the fire extinguishing operation, the fire will be extinguished by closing the hydraulic automatic valve, but the spindle may not return and the valve opening device may not be reset and the ignition operation may be performed. If the valve opening device is not reset, it means that the magnet safety valve is opened and cannot be moved to the adsorption position because it is disengaged. Therefore, it is necessary to control energization of the magnet safety valve in order to normally ignite and burn even with rapid repeated operation, and to appropriately control the discharge of the igniter for ignition when the hydraulic automatic valve is restarted.

An object of the gas water heater of the present invention is to solve the above-mentioned problems, to effectively use the electric power of a dry battery, and to provide a safe water heater without inconvenience in various usage conditions.

[0015]

[Means for Solving the Problems]

 The gas water heater of the present invention which solves the above-mentioned problems is equipped with a valve opening device that opens a magnet safety valve and a hydraulic automatic valve provided in the gas flow path by a spindle that moves back and forth according to the water flow pressure. A gas water heater equipped with a valve opening device that opens a magnetic safety valve at the tip of the spindle, and a pressing member that opens a hydraulic automatic valve at an intermediate position of the spindle. When the spindle advances and retreats in the direction of opening the magnet safety valve by passing water, an engagement maintaining mechanism that maintains the engagement state between the spindle and the valve opening device; and Disengagement mechanism that uses power to disengage the spindle from the valve opening device to open the magnet safety valve, and the spindle after completion of opening the magnet safety valve. After the engagement between the valve opening device and the valve opening device is disengaged, a valve opening sequence ensuring mechanism that opens the hydraulic automatic valve by the pressing member provided on the spindle, and during the backward movement of the spindle by stopping the water flow of the gas water heater, It is equipped with a reset mechanism that reengages the spindle and the valve opening device, and during ignition operation, energization of the magnet safety valve is started by the electromagnetic force until the spindle and valve opening device are disengaged. An energization holding start means for holding the valve, and a discharge control means for starting the ignition discharge before the opening of the magnet safety valve and stopping the discharge after a predetermined time has passed immediately after the opening of the automatic hydraulic valve are started. And are the gist.

Further, the gas water heater of the second invention is the same as the gas water heater of the first invention, in the stopping operation, the magnet safety valve is connected to the magnet safety valve after a lapse of a predetermined time from the end of substantially closing the hydraulic automatic valve. It is provided with an energization stopping means for stopping the power supply and a control ending means for ending all the control operations of the gas water heater when the spindle and the valve opening device are re-engaged by the reset mechanism. And

The gas water heater according to a third aspect of the present invention is the gas water heater according to the first aspect, which is of a low level enough to keep the magnet safety valve energized at the start of opening the hydraulic automatic valve. The gist is that it is equipped with a magnet safety valve current switching means for switching to current.

Further, a gas water heater of a fourth invention is the gas water heater of the first invention, further comprising frame guard operation starting means for starting flame detection by a frame guard at the start of opening of the hydraulic automatic valve. The point is to have prepared.

[0019]

[Action]

 In the gas water heater of the present invention having the above structure, when water is supplied by the ignition operation, the spindle is displaced first, and at this time, the valve opening device and the spindle are engaged by the engagement maintaining mechanism. The magnet safety valve is pushed and opened by the displacement. After that, the disengagement between the two is released by the displacement force of the spindle, and the magnet safety valve can be closed. Further, when the spindle is displaced, the hydraulic automatic valve is opened. When the water flow is stopped due to the fire extinguishing operation, the spindle retracts to close the hydraulic automatic valve, and the spindle retracts again to reengage the spindle with the valve opening device to prepare for the next ignition. During this ignition operation, energization of the magnet safety valve is started until the spindle and the valve opening device are disengaged, electromagnetic force is generated, and the valve is held open. Therefore, when the magnet safety valve is opened and pressed, a current flows surely to keep the magnet safety valve open. Also, the ignition discharge is started before the opening of the magnetic safety valve, and it stops after a lapse of a predetermined time immediately after the opening of the automatic hydraulic valve.Therefore, even if an abnormal closing of the automatic hydraulic valve occurs, explosion ignition is prevented. Moreover, even if the automatic hydraulic valve opens slowly due to the influence of hydraulic pressure, the discharge time required for ignition can be reliably ensured.

In addition, the gas water heater of the second invention further stops the energization of the magnet safety valve after a predetermined time has elapsed from the end of the closing of the automatic hydraulic pressure valve during the stop operation, so that the quick repeat operation is performed. Even if the valve opening device does not recover the pushing force during the re-ignition in step 1, the magnet safety valve can be left open. Therefore, it is possible to perform the re-ignition operation by the quick repeated operation without any trouble. Further, when the spindle and the valve opening device are re-engaged by the reset mechanism, all the control operations of the gas water heater are completed, so that the operation can be stopped in preparation for the next re-ignition.

In addition, the gas water heater of the third invention switches the energization to the magnet safety valve to a low level current sufficient to hold the valve open at the start of opening the automatic water pressure valve, so that the power consumption of the dry battery is limited. Can save

Further, since the gas water heater of the fourth invention starts flame flame detection at the start of opening of the hydraulic automatic valve, when gas flow starts, that is, when ignition occurs and flame detection operation starts. Can be made the same, and reliable flame detection can be performed while effectively utilizing the limited electric power of the dry battery.

[0023]

【Example】

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

FIG. 2 is a block diagram of a switch operating unit according to the present invention. The water side shaft 14 transmits the 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 side shaft 14 of the hydraulic pressure responding device 16 to receive a displacement force, and is urged rightward in the figure by a spring 27 provided coaxially. The hydraulic pressure responding device 16 has no displacement force while the water flow is stopped, and returns the spindle 37 to the right direction to the initial stop position by the spring 27. A protrusion for actuating the first switch 21 and the second switch 22 is provided on the outer periphery of the receiving part of the spindle 37 for the water side shaft 14 and corresponds to the position when the spindle 37 is displaced on the axis. The switch is set to ON / OFF to detect the position.

The operation timings and functions of the first switch 21 and the second switch 22, which are the two switches that operate in response to the displacement of the spindle 37, will be described based on the time chart of FIG.

First, the opening / closing sequence of each valve and its operation will be described. (Note that the constituent parts of each part are shown in FIG. 1.) At the time of ignition operation, the hydraulic pressure responsive device 16 is activated by the passage of water to displace the spindle 37, and the automatic hydraulic valve 30 is opened. The valves are sequentially opened as follows in accordance with the movement of the spindle 37 at the time of ignition. First, the valve opening device 8 provided on the spindle 37 starts pushing the magnet safety valve 7. At the position where the valve opening device 8 pushes and opens the magnet safety valve 7, the spindle 37 is set so as not to open the hydraulic automatic valve 30 yet. After the magnet safety valve 7 is opened and pressed (after completion of the valve opening), the valve opening device 8 is disengaged from the spindle 37 by its displacement force and slides back on the spindle 37 to release the pushing motion. . At this time, the magnet safety valve 7 maintains the adsorption valve open state by the energization described later, and becomes the valve closeable state by retreating the valve opening device 8. Then, the automatic hydraulic valve 30 starts to open due to the displacement of the spindle 37. When the automatic hydraulic valve 30 is opened, the gas reaches the burner 4 and is ignited by the discharge of the igniter 51 to start combustion. During combustion, the combustion controller 48 monitors flame and combustion abnormalities by the flame guard 50 or the thermocouples 49 and 3, and if there is an abnormality, the magnet safety valve 7 is deenergized and closed.

Next, in the fire extinguishing operation, the water pressure response device 16 loses the displacement force due to the water stop, and the spindle 37 is returned to the initial stop position by the spring 27. The valves are sequentially closed in accordance with the movement of the spindle 37 at the time of extinguishing the fire. During the fire extinguishing operation, the energization of the magnet safety valve 7 from the combustion controller 48 is stopped at a predetermined timing to close the magnet safety valve 7. When the spindle 37 moves back and forth, the hydraulic automatic valve 30 first closes, and when the spindle 37 moves backward and approaches the stop position, the valve opening device 8 engages with the spindle 37 and reaches the stop position.

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

The combustion controller 48 controls the attraction / holding current of the magnet safety valve 7, the ON / OFF of the holding current, the discharge of the igniter 51 for ignition, and the operation of the flame guard 50 for flame detection according to the timing of this detection signal.

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 to the valve opening start position of the magnet safety valve 7. Specifically, the ON position of the first switch 21 is set to the position immediately before the opening of the magnet safety valve 7 is started. 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 reason why the ON detection position of the first switch 21 is set to the valve opening start position of the magnet safety valve 7 and the magnet safety valve 7 is energized to activate the igniter 51 is as follows. In order to securely hold the magnet safety valve 7 in the open state, the valve opening device 8 opens the magnet safety valve 7 and pushes it all the way until the spindle 37 and the valve opening device 8 are disengaged (press release). This is because it is necessary to pass an electric current. The magnet safety valve 7 needs an assisting force to push the adsorption piece 46 against the adsorption surface 47, and the displacement force by the hydraulic pressure response device 16 by water passage opens the magnet safety valve 7 via the valve opening device 8 to adsorb the adsorption force. The piece 46 is pressed against the suction surface 47. If the combustion controller 48 energizes the magnet safety valve 7 before pressing, the electromagnetic force is generated on the attracting surface 47 by the power of the dry battery, and the attraction force 46 is overcome by the spring 45 force of the magnet safety valve 7. The connected valve body 43 is held open. Therefore, even if the attraction piece 46 is pressed against the attraction surface 47 and energized after opening, the valve does not open. Therefore, energization is required before pressing and opening, and the magnet safety valve 7 is opened before being pressed by the spindle 37. Energize at the position where the valve starts to be turned on.

Regarding the start of discharge of the igniter 51, discharge is started from the start of opening the magnet safety valve 7 in order to enhance safety. The reason for this will be described below. Normally, when the magnet safety valve 7 is pushed open, the automatic water pressure valve 30 is closed, so gas does not flow out and no electric discharge is necessary. In this state, when the magnet safety valve 7 is opened, the gas will start to be emitted to the burner 4. For example, this is a case where the automatic hydraulic valve 30 is closed improperly due to scratches on the seat portion or biting of dust.

Further, the abnormal closing of the automatic hydraulic valve 30 is caused by the opening of the magnet safety valve 7 when the supply water pressure is further low or when the spindle 37 has a large sliding resistance and the spindle 37 moves slowly. It takes time for the spindle 37 to move from the valve to the opening of the hydraulic automatic valve 30, and the abnormal gas release time is lengthened. Therefore, in this case, if the igniter 51 is discharged when the hydraulic automatic valve 30 is opened, the magnet safety valve 7 will be discharged where gas is already flowing when the valve is opened, which may cause explosion and ignition. . Therefore, even if 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 to safely ignite the gas by flowing the gas to the place where discharge is occurring. This is done from the valve 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 is set at the valve opening start position of the hydraulic automatic valve 30 after the pressing of the magnet safety valve 7 is released. Specifically, the ON detection position of the second switch 22 is set to the position immediately after the opening of the hydraulic automatic valve 30 starts. When the second switch 22 detects the ON state, the combustion controller 48 switches the attracting current to the magnet safety valve 7 to the holding current and starts the counting of the timer that determines the time to stop the discharge of the igniter 51 for the following reason. At the same time, the frame guard 50 is operated according to the sequence described below.

The reason for switching to the holding current is to save the limited power of the dry battery power source. It utilizes the hysteresis characteristic of the electromagnet of the magnet safety valve 7 that once attracted, the magnetic flux density does not change much even at a lower current. In other words, the valve opening start position of the hydraulic automatic valve 30 is the position where the valve opening has already been completed by the electromagnetic force generated by the energization of the magnet safety valve 7, so it is a low level sufficient to hold the magnet safety valve 7 open. The holding current is switched to. (Hereinafter, the high level current before switching is called the adsorption current, and the current after switching to the low level is called the holding current.)

The reason why the stop timer of the igniter 51 is operated at the open 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 ensure reliable ignition. In other words, the stop timer of the igniter 51 should stop the igniter 51 after sufficient discharge for ignition, so the stop timer is activated when gas starts to be emitted (the hydraulic automatic valve 30 is opened), and after a predetermined discharge. This is because by stopping the operation, it is possible to secure the required discharge time when gas is being emitted.

The flame detection by the flame guard 50 operates at the valve opening position of the hydraulic automatic valve 30 when the gas starts to come out. The opening position of the automatic water pressure valve 30 is the position at which combustion is started, and is therefore the optimum position for starting flame detection. When flame detection by the flame guard 50 is started, first, it is monitored for a maximum of T1 hours until it is confirmed that there is a flame. Next, when it is confirmed that there is a flame, pause and once again after T2 time has elapsed, monitor again for up to T3 hours until it is confirmed that there is a flame. If it can be confirmed again that a flame is present, flame detection by flame guard 50 is switched to electromotive force detection by thermocouples 49 and 3. If there is no flame during the monitoring time of T1 time or T3 time, the combustion controller 48 stops energizing the magnet safety valve 7 and closes it.

The reason why the flame detection by the flame guard 50 is switched to the 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 transition time is needed until it stabilizes. Further, the flame guard 50 detects flames by utilizing the flame rectification effect, and operating for a long time increases the consumption of dry battery power, which is limited power. Therefore, flame detection by the flame guard 50 is switched to electromotive force detection by the thermocouples 49 and 3.

Therefore, when the automatic hydraulic valve 30 starts to open, the gas starts to be emitted and is ignited by the igniter 51 that is discharging, and the stop timer of the igniter 51 is activated to stop the igniter 51 after a lapse of a predetermined time. The detection by 50 is switched to the detection by 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 valve 30, the combustion controller 48 determines that it is an abnormal state and stops energizing the magnet safety valve 7 to close the valve. Then the gas is cut off the flow path.

Next, the third detection position and the fourth detection position will be described. The third detection position is detected by the OFF operation of the second switch 22, and is set to a substantially closed position of the hydraulic automatic valve 30. The fourth detection position is detected by the OFF operation of the first switch 21, and is set to the reset position of the valve opening device 8. Specifically, the OFF position of the second switch 22 is set to the position immediately before the closing of the automatic hydraulic valve 30. Further, the OFF operation position of the first switch 21 is set to the stop position side near the reset position of the valve opening device 8.

The OFF operation timings of the first switch 21 and the second switch 22 and their functions are performed during the fire extinguishing operation. When the fire extinguishing operation is performed and the water faucet is closed, the spindle 37 is retracted in the stopping direction (to the right in the drawing) by the action of the water pressure responsive device 16, and the automatic water pressure valve 30 is closed. At the position immediately before the completion of the closing of the automatic hydraulic pressure valve 30, the second switch 22 performs the OFF operation, the spindle 37 returns to the vicinity of the stop position, and the valve opening device 8 is reset, and then returns to the first position. The 1 switch 21 is turned off to reach the stop position.

When the second switch 22 is turned off almost at the same time when the closing of the automatic hydraulic valve 30 is completed, the combustion controller 48 sets a timer (to be described later) for turning off the holding current to the magnet safety valve 7. Start counting. When the first switch 21 is turned off, all controls are stopped.

Here, the valve opening device 8 for pushing and opening the magnet safety valve 7 by utilizing water pressure will be described. The function of the valve opening device 8 is to push and open the valve, and when the valve is pushed and opened to the adsorption position, the pressing force is released (press release) and the magnet safety valve 7 is closed. Therefore, due to the mechanism, in order to restore the pressing capability in preparation for the next ignition operation, it is necessary to engage the spindle 37 with the valve opening device 8, that is, reset the same. The reset position is set at a position close to the stop position where the spindle 37 is returned after the automatic hydraulic valve 30 is closed.

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

Therefore, in order to operate the appliance without any problem even in the case of rapid repeated operation, the spindle 37 is returned to the stopping direction by the fire extinguishing operation, and even if the hydraulic automatic valve 30 is first closed to extinguish the fire, the magnet safety valve 7 is immediately opened. It is possible to solve the problem in use by turning off the holding current of the magnet safety valve 7 after the spindle 37 returns to the reset position of the valve opening device 8 instead of turning off the holding current. However, when the above method is adopted, there is a new problem, for example, when the spindle 37 does not return due to the large sliding resistance of the spindle 37 and the seat portion of the automatic hydraulic valve 30 is scratched or dust is bitten. In the case of a poor valve closing condition, it is inconvenient because the magnet safety valve 7 is kept open and gas continues to be emitted.

Therefore, the timer for turning off the holding current of the magnet safety valve 7 is started 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. Position is detected and all controls are turned off. Therefore, the spindle 37 starts to return by the fire extinguishing operation, the second automatic switch 22 is detected to be OFF, the hydraulic automatic valve 30 is closed, and the combustion controller 48 starts the timer for turning OFF the holding current of the magnet safety valve 7. Further, if the OFF detection position of the first switch 21 does not reach after the reset position of the valve opening device 8 even after a lapse of a predetermined time after the timer starts counting, it is determined that the spindle 37 has returned abnormally and the magnet safety valve 7 is detected. The above inconvenience is solved by turning off the holding current of and closing the magnet safety valve 7.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. is there.

For example, protrusions that are switch actuating actuators that are integrated with the spindle 37 are provided at respective positions, and the positions are detected by ON / OF F of one switch by distinguishing between ignition and extinction. You are also free. In addition, the first detection position and the fourth detection position are the same, the second detection position and the third detection position are the same, and they are set within the hysteresis of ON and OFF of the switch, and when the ignition and the fire are extinguished. Separately, it is also possible to detect each position with one switch. Further, the switch is not limited to a mechanical switch, and various switches such as an optical type and a magnetic type can be substituted.

[0049]

[Effect of device]

 As described above in detail, according to the gas water heater of the present invention, when the magnet safety valve is opened and pressed, the holding current flows surely to hold the magnet safety valve open, so that it can be used under low water pressure conditions. Is improved. In addition, the discharge for ignition can prevent explosion and ignition even if a valve closing abnormality occurs in the hydraulic automatic valve, and the discharge time required for ignition can be reliably ensured to improve safety.

Further, the gas water heater of the second invention can perform the re-ignition operation by the rapid repeated operation without any trouble, and can be stopped in the state of preparing for the next re-ignition. Therefore, usability is improved.

In addition, the gas water heater of the third invention can save the limited electric power of the dry battery.

In addition, in the gas water heater of the fourth invention, flame detection of the flame guard can be performed in accordance with the timing of opening and closing of each valve, so that safety and efficiency of use of electric power by dry batteries are improved. It can be dramatically improved.

[0050]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a water heater as an example.

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

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

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

[Explanation of symbols]

 7 Magnet Safety Valve 8 Opening Device 16 Water Pressure Response Device 21 First Switch 22 Second Switch 30 Automatic Water Pressure Valve 37 Spindle

Claims (4)

[Scope of utility model registration request] 1. A gas water heater that opens a magnet safety valve and a hydraulic automatic valve provided in a gas flow path by a spindle that moves back and forth according to the water flow pressure, the magnet safety valve being provided at the tip of the spindle. A valve opening device that pushes open the water pressure automatic valve at the intermediate position of the spindle is provided respectively, and when the spindle moves toward and away from the magnetic safety valve opening direction of the spindle by passing water through the gas water heater, An engagement maintaining mechanism that maintains the engagement state with the valve opening device, and a magnet safety valve that releases the engagement between the spindle and the valve opening device using the advancing power after the completion of opening the magnet safety valve by advancing and retracting the spindle. The engagement release mechanism for closing the valve, and the spindle after the spindle and the valve opening device are disengaged after the opening of the magnet safety valve is completed. It is provided with a valve opening sequence ensuring mechanism for pushing the hydraulic automatic valve by a provided pressing member, and a reset mechanism for engaging the spindle and the valve opening device again during the backward movement of the spindle by stopping the water flow of the gas water heater. During the ignition operation, energization holding start means for starting energization of the magnet safety valve and holding the magnet safety valve open by electromagnetic force before the spindle and the valve opening device are disengaged, and before opening the magnet safety valve And a discharge control means for starting the discharge for ignition and stopping the discharge after a lapse of a predetermined time immediately after the opening of the automatic hydraulic valve is started. 2. An energization stopping means for stopping the energization of the magnet safety valve after a predetermined time has elapsed from the end of substantially closing the hydraulic automatic valve during the stop operation, and the spindle and the valve opening device are re-engaged by the reset mechanism. The gas water heater according to claim 1, further comprising a control ending means for ending all control operations of the gas water heater when combined. 3. The gas according to claim 1, further comprising magnet safety valve current switching means for switching energization to the magnet safety valve to a low level current sufficient to hold the valve open when the automatic hydraulic valve starts opening. Water heater. 4. The gas water heater according to claim 1, further comprising a frame guard operation starting means for starting flame detection by a frame guard at the start of opening of the hydraulic automatic valve.