JPH0330705Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a safety device for a stop-start water heater that performs ignition, combustion system during hot water dispensing, and extinguishing by pushing an operation button.

[Conventional technology]

Just push the operation button to ignite, burn,
One-touch type water heaters that extinguish fires are attracting attention because they are convenient to operate, but if the automatic gas valve of the hydraulic response device is opened before the water passes through the heat exchanger when igniting, raw gas will be released. For safety reasons, it is necessary to ignite the gas with the automatic gas valve of the hydraulic response device not open, that is, with no water flowing to the heat exchanger, as there is a risk of gas release and explosion and ignition. Therefore, in stop-off type water heaters, the operation button and water supply valve are linked to ensure safety, but in the case of stop-off type water heaters, the interlocking mechanism with the water supply valve is extremely complicated. Therefore, safety measures have not yet been implemented.

[The problem that the idea aims to solve]

This idea works in conjunction with the water pressure response device and the lock mechanism of the operation button in a stop-start type water heater, making it impossible to push the operation button in the event of an abnormal situation where water is flowing first to the heat exchanger at the time of ignition. The above-mentioned drawbacks of the conventional method are solved by regulating the water flow and making the push operation possible only during normal times when water is not flowing.

[Means to solve the problem]

This invention consists of a first lever 1 that is interlocked with a hydraulic response device A, and an operation in which the first lever 1 is rotated and slid in a direction parallel to the first lever 1, and rotated by a push operation of an operation button 2 to operate an electromagnetic safety valve device B. Locking rod 4, which locks rod 3 unrotatably, is connected to first lever 1 and locking rod 4.
The heat exchanger C
In the event of an abnormality in which water is flowing in advance, the locking lever 4 moves in a direction to prevent rotation of the operating lever 3 via the first lever 1 and the second lever 5, which are interlocked with the hydraulic response device A. When the locking rod 4 is engaged with the operating rod 3 and the movement of the operating rod 3 is prevented, and under normal conditions when water is not being supplied to the heat exchanger C, the locking rod 4 moves in the direction of releasing the engagement prevention of the operating rod 3 and the operating rod 3 is prevented from engaging. This invention relates to a safety device for a stop-start type water heater, characterized in that the device 3 is not prevented from being engaged.

[Effect]

Since this device has the above-mentioned configuration, in the event of an abnormality in which the water flow to the heat exchanger precedes the ignition, the hydraulic response device A → the first lever lever 1 that is interlocked with the hydraulic response device A →
The second lever 5 swings in a direction crossing the first lever 1 → the lock lever 4 slides in a direction crossing the second lever 5, and the lock lever 4 is linked with the operation button 2. In order to prevent movement of the operating rod 3 that operates the electromagnetic safety valve device B, the electromagnetic safety valve device B cannot be operated by pushing the operating button 2, and pilot ignition cannot be performed. In addition, under normal conditions when water is not flowing to heat exchanger C at the time of ignition, hydraulic response device A→
The first lever 1 → the second lever 5 → the locking lever 4 are interlocked in this order to enable the push operation of the operating button 2 to release the lock of the operating lever 3 by the locking lever 4, which activates the electromagnetic safety valve device B and ignites. Together with the functions of the ignition switch and other ignition function parts, the pilot ignition can be performed smoothly and reliably.

〔Example〕

An embodiment of the safety device for a stop-start water heater according to this invention will be described below with reference to the drawings.

The embodiment is applied to a stop-start type water heater in which ignition, combustion system, and extinguishing can be performed with a single touch of a push-button operation button. A valve chamber 8 provided in a gas supply passage 7 to the heat exchanger C is equipped with an automatic gas valve V ₁ biased in the closing direction by a spring 9, and the automatic gas valve V ₁ is provided in a water supply passage 10 to the heat exchanger C. A diaphragm 13 is biased and tensioned toward the secondary chamber 11b by a spring 12 having a weaker elastic force than the spring 9 of the automatic gas valve V ₁ in the diaphragm chamber 11. and the primary chamber 11a side,
That is, the valve chamber 15 adjacent to the upstream side 10a of the water supply passage 10 is equipped with a constant flow valve _V2 , and the constant flow valve _V2 is connected to the primary chamber 11a side of the diaphragm 13 to form an automatic gas valve V. ₁ automatically controls the amount of gas supplied to the main burner 6 in proportion to the amount of water supplied to the heat exchanger C by responding to the water supply pressure via the diaphragm 13. Gas is also supplied and cut off to the burner 6, and the water supply flowing into the primary chamber 11a is automatically controlled to be constant at all times by a constant flow valve _V2 . Reference numeral 1 designates a first lever lever that is interlocked with the hydraulic response device A, whose approximately central portion is freely pivoted by a support shaft 16, and whose base end 1a is connected to the automatic gas valve V ₁ of the hydraulic response device A. In addition to being associated with the valve stem 14, the tip portion 1b is associated with the switch rod 17 of the ventilation fan switch S so that the ventilation fan switch S can be turned on and off by the first lever rod 1 that is interlocked with the hydraulic response device A. When hot water is tapped, a ventilation fan is turned to allow exhaust air to flow out. In the embodiment, the valve stem 14 is separated and the base end 1a of the first lever 1 is interposed between them so that the valve stem 14 and the first lever 1 are interlocked, but the valve stem 14 is not connected to the first lever 1 by other means. The shaft 14 and the first lever 1 may be interlocked. Reference numeral 2 denotes an operating button, which is integrally equipped with a push rod 18 and is biased by a return spring 19 in the return direction (upward as shown in FIGS. 1 and 2) to close the mounting plate 2.
It is inserted into a bearing 21 that is fixedly installed at 0 and can be freely moved forward and backward.
The operating button 2 is controlled by a stroke regulating means in which a regulating protrusion 23 provided on a bearing 21 is slidably fitted into a heart cam groove 22 carved in a pushing rod 18, so that the operating button 2 is controlled by a certain stroke a at the first push operation. The pilot is ignited by moving forward (downward as shown in Figures 1 and 2, the same applies hereinafter) (see Figures 5 and 6), and when the pressing force is released, the stroke control means causes the cylinder to move only a certain stroke b. Retreat (as shown (1st
Figures and Figures 2) Above, the same applies below) and hot water tap V ₃
Switches to a combustion system in which gas is supplied and cut off to the main burner 6 during hot water tapping by opening and closing the button (see Figures 5 and 6), and the burner is locked in that position. When the stroke control means moves forward by a constant stroke b′ and releases the lock, and the pressing force is released, the constant stroke
Its stroke is controlled so that it moves back by a' and returns to its original position to be in the extinguished state (see FIGS. 5 and 6). Reference numeral 3 denotes an operating rod for operating the electromagnetic safety valve device B, which is a push lever 18 of the operating button 2.
It has a tip push plate 3a that abuts against, and a push piece 3b that operates an electromagnetic safety valve device B (described later), and is integrally provided with a stopper piece 3c in the center, whose base end is freely pivoted by a support shaft 24. I support you. Reference numeral 4 denotes a locking rod that prevents the movement of the operating rod 3 only in the event of an abnormality in which water flow to the heat exchanger C is preceded.The locking rod 4 is pivoted approximately at its center on a guide plate 25 by a support shaft 26, and is horizontally rotated. The torsion spring 2 is provided to slide freely on the
7 (FIG. 4) is biased counterclockwise, and the tip engaging portion 4a is pushed against the stopper piece 3c of the operating rod 3.
The proximal end portion 4b is connected to the distal end portion 1b of the first lever 1 via the second lever 5. The second lever 5 is located perpendicularly to the first lever 1 and the locking lever 4, and is rotatably supported approximately at its center by a support shaft 28, and its base end is located at a right angle to the first lever 1 and the locking lever 4.
The tip end 1b of the lever 1 is in contact with the base end 4b of the locking rod 4, and the torsion spring 2 of the locking rod 4 is connected to the tip 1b of the lever 1.
With an elastic force of 7, the first lever 1, the locking lever 4 and the second
The levers 5 are designed to maintain contact and work together. B is an electromagnetic safety valve device, which is equipped with a safety valve V ₃ biased in the closing direction by a spring 31 in a valve chamber 30 provided in the gas supply path 29 upstream of the automatic gas valve V ₁ of the hydraulic response device A; An adsorption iron piece 33 provided at one end of the valve shaft 32 is installed so as to be able to come into contact with and separate from the adsorption surface of the electromagnet M, and the electromagnetic coil of the electromagnet M has a quick start mechanism that instantly excite the electromagnet M at the time of initial ignition. The capacitor of the device (not shown) is connected to a thermocouple TC which takes over the excitation of the electromagnet M by thermoelectromotive force after ignition and continues to excite the electromagnet M. During normal pilot ignition, the iron piece 33 that attracts the safety valve V ₃ is connected to the thermocouple TC. In the event of ignition failure or other abnormality, the current to the electromagnet M is cut off and the safety valve _V3 is immediately closed to cut off the gas supply and ensure safety. The above-mentioned quick start device switches the capacitor between a discharging circuit and a charging circuit using an ignition switch (not shown) that is turned on by pressing the operation button 2 together with an igniter switch.
It also starts and stops the igniter.
V ₄ is a device plug, which is installed in a valve chamber 34 adjacent to the valve chamber 30 of the safety valve V ₃ , whose valve shaft 35 is associated with the pressing piece 3b of the operating rod 3, and whose extended valve shaft 36 is connected to the pressing piece 3b of the operating rod 3. A certain amount of play exists in relation to the safety valve V ₃ so that the appliance spigot V ₄ and the safety valve V ₃ are interlocked when igniting and extinguishing the fire, and the appliance spigot V ₄ is biased in the closing direction by a spring 37. This spring 37 urges the operating rod 3 in the counterclockwise direction as shown (FIG. 1) via the valve shaft 35 in order to automatically return the operating rod 3. _V5 is a valve for supplying and cutting off gas to the primary pilot burner _P1 , and is connected to the valve shaft ₃ of the appliance plug V4.
5, and is designed to supply gas to the primary pilot burner _P1 in conjunction with the appliance plug _V4 only at the time of initial ignition. D is the gas governor device,
It is installed between the automatic gas valve V ₁ and the appliance tap V ₄ and automatically controls the amount of gas supplied to the main burner 6 to always be constant. P ₂ is the secondary pilot burner,
Gas is supplied through a gas pipe 38 led out from the downstream side of the gas governor device D, and after normal ignition, a normal pilot flame is formed and also serves to heat the thermocouple TC. E is a capacity switching device, which is installed in the gas supply passage 7 to the main burner 6, and by sliding the operating knob 39 left and right, slide valve V ₆ can be operated to increase or decrease the amount of gas supplied to the main burner 6. It is something. V ₇ is a temperature control valve located downstream from the diaphragm chamber 11 of the hydraulic response device A in the water supply passage 10.
0b, and the amount of water supplied to the heat exchanger C can be increased or decreased by operating a slide valve plate 41 by rotating the temperature control valve shaft 40. 4
2 is a bench lily portion provided on the downstream side 10b of the water supply passage 10, and is a diaphragm chamber 11 of the hydraulic response device A.
The secondary chamber 11b is communicated with the secondary chamber 11b via a connecting pipe 43. V ₈ is the hot water tap, and V ₉ is the water drain tap.

In the above configuration, the operation will be explained next. When not in use, the automatic gas valve V ₁ of the hydraulic response device A,
Appliance valve V ₄ and safety valve V ₃ are both closed (7th
(see the position indicated by the solid line in the figure), and during normal operation when water is not flowing to this heat exchanger C, the valve shaft 14 of the automatic gas valve V ₁ of the hydraulic response device A is shown in the figure (Figures 1 and 7).
In the left position, the base end 1a of the first lever 1 is on the left as shown in the drawings (Figs. 1 and 7), and the distal end 1b is on the right as shown in the drawings (Figs. 1 and 7). Got tired,
The locking lever 4 is shown via the second lever 5 (the fourth
Figure) Rotating in the counterclockwise direction, and its tip engaging portion 4
a is a stopper piece 3c of the operating rod 3 which is moving upwards as shown in the figure (Fig. 4) by the elastic force of the torsion spring 27.
The tip engaging portion 4a of the locking rod 4 escapes from the lower part of the locking rod 4, making it possible to rotate the operating rod 3 in the clockwise direction shown in the drawings (FIGS. 1 and 3). However,
When the operation button 2 is pushed forward for the first time against the return spring 19 by a predetermined stroke a predetermined by the stroke control means formed by the heart cam groove 22 and the regulating protrusion 23, the operation button is pressed. The operating rod 3 is rotated by a certain angle in the clockwise direction through its tip press plate 3a (FIGS. 1 and 3), and its pressing piece 3b is used to push the valve stem 3.
At the same time, with a certain amount of play in the extended valve shaft 36, _the safety valve _V3 is also pushed open against the spring 31, and the valve shaft opens. 32, the adsorption iron piece 33 is pressed against the adsorption surface of the electromagnet M, and at the same time, the pilot valve V ₅ is firstly pressed.
will also be opened. Therefore, the gas from the gas inlet 44 is supplied to the primary pilot burner P ₁ and is guided to the valve chamber 8 of the automatic gas valve V ₁ via the gas governor device D, and also to the secondary pilot burner P ₂ through the gas pipe. Gas was supplied through 38, and at the same time, the quick switch was switched to the discharge circuit, and the current from the capacitor excited the electromagnet M, which instantly attracted the adsorbing iron piece 33 and held the safety valve _V3 open, and the igniter switch was also turned on. The igniter is energized, and the spark from the ignition plug ignites the primary pilot burner P ₁ → secondary pilot burner P ₂ , the secondary pilot flame heats the thermocouple TC, and the thermoelectromotive current takes over the safety valve V ₃ and holds it open. (See Figures 5 and 6). After that, when the pressing force on the operation button 2 is released, the operation button 2 moves back together with the push rod 18 by the elastic force of the return spring 19 by a certain stroke b predetermined by the stroke control means, and the combustion at the time of tapping the hot water is carried out. In other words, when the hot water tap _V8 is opened to dispense hot water, the hydraulic response device A is activated by the water supply pressure, automatically opens the gas valve _V1 , and supplies gas to the main burner 6, which is ignited by the secondary pilot flame. The system shifts to the combustion mode and is locked in this position (see Figures 5 and 6), and the first lever 1 is linked by the operation of the hydraulic response device A to turn on the ventilation fan switch S, and the hot water is turned on. At times, rotate the ventilation fan to exhaust the air. At this time, the device tap V ₄ is still in the open state, having retreated by a certain stroke b, and the primary pilot valve provided on the valve shaft 35 is closed.
_V5 is closed, the primary pilot flame is extinguished, the quick switch is switched to the charging circuit, and the igniter switch is turned off.

In the above combustion system, when the hot water tap V ₈ is opened, the water supply pressure causes the diaphragm 13 of the hydraulic response device A to move to the right (as shown in FIG. 7), and the automatic gas valve V ₁ is connected to the spring 9 via the valve shaft 14. Gas is supplied to the push-open main burner 6 and ignited by a secondary pilot flame, thereby heating the heat exchanger C. Therefore, the water flowing through the heat exchanger C is heated to raise its temperature and hot water is supplied.

When the hot water tap _V8 is closed, the operation of the water pressure response device A based on the water supply pressure is stopped, so the automatic gas valve _V1
is automatically closed by a spring 9 to cut off the gas supply to the main burner 6 and extinguish it. During this hot water supply and when the hot water supply is stopped, the first lever lever 1 and the locking lever 4 are interlocked with the automatic gas valve _V1 , but the stopper piece 3 of the operating lever 3
c is located above the tip engaging portion 4a of the locking rod 4, so it can be carried out without any problem. The series of ignition and combustion system operations described above are properly performed in one action by simply pushing and releasing the operation button 2 by a certain stroke a, and if the above operations fail, the thermocouple TC will heat up. Since the gas is stopped, safety valve _V3 is automatically closed to cut off the gas and ensure safety.

Next, when the pilot is extinguishing the fire, the operation button 2 located in the combustion mode position is pressed a second time to produce a constant stroke predetermined by the stroke control means.
When pushed forward by b', the lock in the combustion mode position is released, and then, when the pushing force is released, the operating button 2 moves along with the pushing rod 18 by a constant stroke a' predetermined by the stroke control means. It retreats by the elastic force of the return spring 19 and returns to its original position (see FIGS. 5 and 6). However, the operating lever 3
The appliance tap _V4 returns to its original position by the elastic force of the spring 37, cutting off the gas supply and extinguishing the secondary pilot flame. Thereafter, the safety valve V ₃ also returns to its original position and is closed, and the first lever 1 and locking rod 4 also return to their original positions in conjunction with the valve shaft 14, and the ventilation fan switch S is turned off and the ventilation fan also stops rotating. . The series of extinguishing operations described above is performed by pressing operation button 2 with a constant stroke.
It can be easily performed in one action by simply pushing and releasing b′.

Next, at the time of the above-mentioned ignition, if there is an abnormality in which water is flowing first to the heat exchanger C, the diaphragm 13 of the hydraulic response device A is moved to the right (as shown in FIG. 7) by the water supply pressure, and the diaphragm 13 The valve shaft 14 connected to the valve shaft 14 is also shown running to the right (FIG. 7), so the first lever rod 1 that turns on and off the ventilation fan switch S in conjunction with the valve shaft 14 crosses the first lever rod 1. The second lever 5 swings in the direction → the valve chamber 8 crosses the second lever 5
The locking rod 4 is rotated in the clockwise direction as shown in the figure (FIG. 4) against the torsion spring 27 by interlocking the locking rod 4 sliding on a guide plate 25 fixed to a lower part of a stopper piece 3c formed integrally with the operating rod 3 which rotates when the operating button 2 is pushed to operate the electromagnetic safety valve device B;
That is, clockwise rotation of the operating rod 3 is locked in order to position it on the rotation locus of the stopper piece 3c. Therefore, even if the automatic gas valve V ₁ of the hydraulic response device A is opened via the valve stem 14 due to water supply pressure, the safety valve V ₃ and the appliance tap V ₄ of the electromagnetic safety valve device B will not be opened by mistake. Therefore, there is no release of raw gas.

In the above embodiment, the present invention is applied to a single push-type operation button, but it is of course applicable to a system having a separate ignition button and extinguishing button.

[Effect of idea]

As explained above, this device disables the ignition operation using the operation button when there is an abnormality in which water is flowing first to the heat exchanger, and allows this operation only during normal times when water is not flowing. It is safe because it eliminates the danger of raw gas release and explosion and ignition. Furthermore, since the structure is simple, it can be attached to a conventional one with only slight modifications.

Furthermore, in the event of an abnormal situation where water is flowing first to the heat exchanger, the pressing force of the operation button is completely absorbed by the operating rod, and the pressing force does not reach the hydraulic response device or electromagnetic safety valve device. In addition, the locking lever is operated via the first and second lever levers, and the electromagnetic safety valve device is operated via the operating lever, so that the water heater can be operated for a long period of time without adversely affecting each other when the locking levers are locked. Can be used safely.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of the safety device for a stop-start water heater according to this invention, Figure 2 is a side view,
Figure 3 is a sectional view of only the main parts, Figure 4 is a plan view of the same,
FIG. 5 is a front view showing an example of a stroke control means for an operation button, FIG. 6 is a line diagram thereof, and FIG. 7 is a developed sectional view of an application example. A... Hydraulic response device, S... Ventilation fan switch, 1... First lever lever, 2... Operation button, B... Electromagnetic safety valve device, 3... Operating lever, 4... Lock lever,
5...Second lever, C...Heat exchanger.

Claims (1)

[Scope of utility model registration request] The first lever 1 is interlocked with the hydraulic response device A, and the second lever 5 of the locking rod 4 is interlocked with the operation button 2 to prevent movement of the operation rod 3 which operates the electromagnetic safety valve device B.
The locking lever 4 locks the operating lever 3 to disable the push operation of the operating button 2 in the event of an abnormality in which water flows to the heat exchanger C in advance during ignition. A safety device for a stop-start type water heater, characterized in that the lock is released to release the restriction during normal operation when water is not flowing, and the push operation of the operation button 2 is enabled.