JPH0330704Y2 - - Google Patents

Description

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

(Prior art) Water heaters that can ignite, burn, and extinguish fire simply by pressing a button have been attracting attention because they are convenient to operate, but water heaters must first pass water through a heat exchanger when igniting. If the automatic gas valve of the hydraulic response device is open, there is a risk of releasing raw gas and causing an explosion and ignition, so for safety reasons, the automatic gas valve of the hydraulic response device should not be open.
That is, it is necessary to ignite the heat exchanger with no water flowing through it. 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. There was a strong desire for a means that could ensure safety with a simple structure.

(Problem that the invention attempts to solve) This invention is a first-stop type water heater, in which the water pressure response device and the lock mechanism are linked to activate the operation button in the event of an abnormality where water is flowing first to the heat exchanger. This solves the above-mentioned drawbacks of the prior art by making it impossible to lock.

(Means for Solving the Problems) This invention provides a lever 1 that swings in conjunction with the hydraulic response device A, and a blocking rod 2 that is pivotally supported in a direction crossing the lever 1, and is operable. The operation rod 4, which is rotated by the push operation of the button 3 to operate the electromagnetic safety valve device B, and the blocking rod 2 are operated in the event of an abnormality in which water is flowing to the heat exchanger C first at the time of ignition. Operation rod 4
The operating rod 4 is engaged with the blocking rod 2 in a direction to prevent the rotation thereof, and the operating rod 4 is engaged with the blocking rod 2 to prevent its operation, thereby allowing water to flow to the heat exchanger C. In a normal state when the system is not in use, the blocking rod 2 is interlocked with the hydraulic response device A through the lever rod 1, and the blocking rod 2 is interlocked with the lever rod 1 in a direction in which the blocking is released, thereby enabling the operation. This relates to safety devices for boilers.

(Function) Since this device has the above-mentioned configuration, when there is an abnormality in which water flows to the heat exchanger C in advance at the time of ignition, the tip of the blocking rod 2 is passed through the lever 1 which is interlocked with the hydraulic response device A. The section faces the lower part of one side of the tip of the operating rod 4 that operates the electromagnetic safety valve device B in conjunction with the operating button 3, and the electromagnetic valve is activated by the push operation of the operating button 3 to prevent the downward rotation of the operating rod 4. Under normal conditions, when the safety valve device B is inoperable and the pilot ignition is not possible, and water is not flowing to the heat exchanger C, the tip of the blocking rod 2 is operated by the operation button via the lever rod 1 which is linked with the hydraulic response device A. The tip of the operating rod 4, which operates the electromagnetic safety valve device B in conjunction with the operation lever 3, escapes from the lower part of one side to release the lock and enable the downward rotation of the operating rod 4, thereby allowing the push operation of the operating button 3. This enables the electromagnetic safety valve device B to operate, and together with the actions of the ignition switch and other functional parts necessary for ignition, pilot ignition can be performed quickly.

(Example) An example of the safety device for a stop-start water heater according to this invention will be explained below based on the drawings.The illustrated example is applied to a one-touch type device that operates a single operation button by pushing. A is a hydraulic response device, which is equipped with an automatic gas valve V ₁ biased in the closing direction by a spring 8 in a valve chamber 7 provided in a gas supply passage 6 to the main burner 5. Diaphragm chamber 10 with V ₁ installed in water supply passage 9 to heat exchanger C
A diaphragm 12 is biased and stretched toward the secondary chamber side by a spring 11 having a weaker elasticity than the spring 8 of the automatic gas valve V ₁ , and the diaphragm 12 is connected to the secondary chamber 10b side via a valve shaft 13, In addition, the valve chamber 14 adjacent to the primary chamber 10a side, that is, the upstream side 9a of the water supply passage 9, is equipped with a constant flow valve _V2 , and the constant flow valve _V2 is connected to the primary chamber 10a side of the diaphragm 12. The automatic gas valve _V1 responds to the water supply pressure via the diaphragm 12 to automatically control the amount of gas supplied to the main burner 5 in proportion to the amount of water supplied to the heat exchanger C.
When the water supply is turned off, the gas supply to the main burner 5 is also turned off. Reference numeral 1 designates a lever lever that is interlocked with the above-mentioned hydraulic response device A, and is formed in a substantially dogleg shape.The lever lever 1 is pivoted approximately at its center by a pivot 15, and is rotatable about the pivot 15 as a fulcrum. The end portion 1a is associated with the valve shaft 13 of the hydraulic response device A, so that the lever rod 1 is interlocked with the hydraulic response device A. In addition, in the example, the valve stem 1
3 is divided, and the base end 1a of the lever lever 1 is interposed between them so that the valve stem 13 and the lever lever 1 are interlocked. Good too. Reference numeral 2 denotes a blocking rod operated by the lever 1, which is formed into a substantially .
It is located perpendicularly to the axis, and is pivoted at its approximate center by a pivot 16, and is urged clockwise by a torsion spring 17 in the illustrated (FIG. 3) direction, and is rotatable about the pivot 16 as a fulcrum. Its base end 2a is connected to the tip end 1b of the lever 1 and the torsion spring 17.
The blocking rod 2 and hydraulic response device A are in constant contact due to the action of
are linked together. 2c is a stopper for restricting the blocking rod 2 in the counterclockwise direction. Reference numeral 3 designates an operation button, which is integrally equipped with a push rod 18, is urged in the return direction (upward in the figure) by a return spring 19, and is inserted into a bearing G; The stroke regulating means, in which a regulating protrusion 21 provided on the bearing G is slidably fitted into the groove 20, moves forward by a certain stroke a at the first push operation (in the upper direction as shown in FIGS. 1 and 2, the same applies hereinafter). ), it shifts to the combustion regime for hot water tapping (see Figures 4 and 5) and is locked in that position, and with the second push operation, it moves forward by a certain stroke b' from the locked position and is unlocked. The stroke is regulated so that when the pressing force is released, the cylinder moves back by a certain stroke a' and returns to its original position, resulting in the extinguished state (see FIGS. 4 and 5). 4 is an operating rod that operates electromagnetic safety valve device B;
The tip push plate 4 that the push rod 18 of the operation button 3 abuts against
a and a pushing piece 4b for actuating the electromagnetic safety valve device B, the proximal end of which is pivotally supported by a support shaft 22, and is rotatable about the support shaft 22 as a fulcrum. When the tip 2b is passing water to the heat exchanger C in advance, it faces one side of the lower part of the tip pushing plate 4a, and when the water is not passing to the heat exchanger C, it faces the tip pushing plate 4a of the operating rod 4. escape from one side below, and
A pushing rod 18 is positioned on the tip pushing plate 4a. B is an electromagnetic safety valve device in which a safety valve V ₃ is biased in the closing direction by a spring 25 and equipped in a valve chamber 24 provided in the gas supply path 23 upstream of the automatic gas valve V ₁ of the hydraulic response device A; An adsorption iron piece 27 provided at one end of the valve shaft 26 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. After 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 and continues to excite it, and during normal pilot ignition, the safety valve V ₃ is connected via the adsorbing iron piece 27. In the event of an ignition failure or other abnormality, the current to the electromagnet M is cut off, the safety valve _V3 is immediately closed, and the gas supply is cut off to ensure safety. In addition, the ventilation fan switch S is turned on and off by the switch operating rod 28 that is linked to the valve shaft 13 of the automatic gas valve V ₁ of the water pressure response device A, and when hot water is dispensed, the switch S is turned on and the ventilation fan is turned to exhaust air. It's summery. V ₄ is the appliance stopper, and the safety valve above
It is installed in the valve chamber 29 adjacent to the valve chamber 24 of V ₃ ,
The valve stem 30 is associated with the pushing piece 4b of the operating rod 4, and the extended valve stem 31 is associated with the safety valve V ₃ with a certain play, so that both valves V ₃ and V ₄ are interlocked when igniting and extinguishing. No, and the appliance stopper V ₄
is urged in the closing direction by a spring 32, and this spring 32
In order to automatically return the operating rod 4, the operating rod 4 is urged counterclockwise as shown in FIG. 1 via the valve shaft 30. V ₅ is a valve for supplying and cutting off gas to the primary pilot burner P ₁ and is the valve shaft 30 of the appliance plug V ₄ .
It opens and closes in conjunction with the appliance valve _V4 to supply and cut off gas to the primary pilot burner _P1 . D is the gas governor device, automatic gas valve
It is installed in the gas supply path 23 between V ₁ and the appliance tap V ₄ , and gas is led out from the downstream side to the secondary pilot burner P ₂ via a gas path 33 .
E is a capacity switching device, which is installed in the gas supply passage 6 to the main burner 5, and by sliding it left and right with the operation knob 34, a slide valve V ₆ is activated, and the amount of gas supplied to the main burner 5 can be increased or decreased. It's becoming like that. _V7 is a temperature control valve, which is installed on the downstream side 9b of the diaphragm chamber 10 of the water pressure response device A in the water supply passage 9. Rotating the temperature control valve shaft 35 activates the slide valve 36, and the heat exchanger C The amount of water supplied can be increased or decreased. Reference numeral 37 denotes a bench lily portion provided on the downstream side 9b of the water supply passage 9, and communicates with the secondary chamber 10b of the diaphragm chamber 10 of the hydraulic response device A via a connecting pipe 38. _V8 is a hot water tap,
V ₉ is a drain valve.

In the above configuration, the operation will be explained next. When not in use, the automatic gas valve V ₁ , the appliance tap V ₄ and the safety valve V ₃ are all in the closed state (see the solid line position in Figure 6), and this heat exchanger Under normal conditions when water is not flowing to C, the valve shaft 13 of the automatic gas valve V ₁ of the hydraulic response device A is in the left position as shown in the illustrations (Figs. 1 and 6), and the lever 1 that interlocks with it is The blocking rod 2 shown (FIG. 1) is rotated clockwise and interlocked with the blocking rod 2. The blocking rod 2 is also shown (FIG. 3) and the tip 2b of the operating rod 4 is rotated clockwise. The operating lever 4 can be rotated in the clockwise direction as shown in FIG. 1 by escaping from the lower part of the operating lever. However, operation button 3
When the button is pressed forward for the first time against the return spring 19 by a predetermined stroke a predetermined by the stroke regulating means such as the heart cam groove 20 of the push rod 18, the The operating rod 4 is rotated by a certain angle in the clockwise direction shown in FIG.
The device plug is inserted through the valve stem 30 with its proximal end pushing piece 4b.
While pushing and releasing V ₄ against the spring 32,
The safety valve V ₃ is also pushed open against the spring 25 with a certain amount of play in the extended valve shaft 31, and the adsorption iron piece 27 provided at one end of the valve shaft 26 is pressed against the adsorption surface of the electromagnet M. The primary pilot valve _V5 is also opened. Therefore, gas from the gas inlet 39 is supplied to the primary pilot burner P ₁ and is also supplied to the valve chamber 7 of the automatic gas valve V ₁ via the gas governor device D.
Gas is also supplied to the secondary pilot burner P ₂ through the gas passage 33, and at the same time, the quick switch is switched to the discharge circuit, and the electromagnet M is excited by the current from the capacitor, and the adsorbing iron piece 27 is instantly adsorbed. While keeping the safety valve _V3 open, the igniter switch is turned on to energize the igniter, and the spark from the ignition plug ignites the primary pilot burner P ₁ → secondary pilot burner P ₂ , and the secondary pilot flame generates thermoelectricity. The TC is heated to excite the electromagnet M, and the thermoelectromotive current takes over the suction and holding by the current from the capacitor, and holds the safety valve _V3 open (see Figures 3, 4, and 5). ). After that, when the pressing force on the operating button 3 is released, the operating button 3 moves along with the pushing rod 18 and the return spring 19 by a certain stroke b predetermined by the stroke regulating means such as the heart cam groove 20.
The combustion system (i.e.,
When the hot water tap _V8 is opened when hot water is dispensed, the hydraulic response device A operates and automatically opens the gas valve _V1 to supply gas to the main burner 5, which is then ignited and combusted by the pilot flame of the secondary pilot burner _P2 . ) and is locked into that position. At this time, the appliance plug
Although V ₄ moves back by a certain stroke b, it is still in the open state, and the valve provided on the valve shaft 30
_V5 is closed to cut off the gas to the primary pilot burner _P1 , extinguishing the primary pilot flame, switch the quick switch to the charging circuit and turn off the igniter switch (see Figures 3, 4 and 5). When hot water is dispensed in this combustion system, when the hot water tap V ₃ is opened, the water supply pressure causes the diaphragm 12 of the hydraulic response device A to move to the right (Fig. 6), and the automatic gas valve V ₁ is activated by the spring via the valve shaft 13. Gas is supplied to the main burner 5 which opens against the pressure 8, ignites it with the pilot flame of the secondary pilot burner P ₂ and heats the heat exchanger C, thereby heating the water flowing through the heat exchanger C. Raise the temperature and supply hot water. At this time, since the tip push plate 4a of the operating rod 4 is located below the tip 2b of the blocking rod 2, the hydraulic response device A can operate without any problem (see FIG. 3).

The above-mentioned series of ignition and combustion system operations can be performed accurately in one action by simply pushing and releasing the operation button 3 by a certain stroke a.If the above operation fails, the thermocouple TC Since the heating of the gas is stopped, the safety valve _V3 is automatically closed to cut off the gas and ensure its safety.

Next, when extinguishing a fire, press the operation button 3 in the combustion mode position.
When the push rod 18 is pushed forward by a predetermined constant stroke b' by the stroke regulating means such as the heart cam groove 20 in the second push operation, the lock in the combustion mode position is released, and then the pushing force is released. The operating button 3 is moved back together with the push rod 18 by the elastic force of the return spring 19 by a certain stroke a' predetermined by the stroke regulating means such as the heart cam groove 20, and returns to its original position. However,
The lever 1 and the blocking rod 2 also return to their original positions, the appliance valve V ₄ of the electromagnetic safety valve device B is closed, the gas supply to the secondary pilot burner P ₂ is cut off, the heating of the thermocouple TC is stopped, and the safety valve V is closed. ₃ is also closed. At this time, the operating rod 4 is pushed away from the blocking rod 2 and rotated counterclockwise by the valve shaft 30 of the appliance stopper V ₄ by the spring 32, returning to its original position (Figs. 3 and 4). and see Figure 5). The series of extinguishing operations described above can be accurately performed in one action by simply pushing and releasing the operating button 3 by a certain stroke 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 12 of the hydraulic response device A moves to the right as shown in the figure (FIG. 6) due to the water supply pressure, and the diaphragm 12 Since the valve shaft 13 connected to the valve shaft 13 also moves to the right as shown in the figure (FIG. 6), the blocking rod 2 moves the torsion spring 17 counterclockwise as shown in the diagram (FIG. 3) via the lever rod 1 that interlocks with the valve shaft 13. The tip 2b of the operating rod 4 is rotated to face the lower part of one side of the tip push plate 4a of the operating rod 4, and by pressing the operating button 3, the operating rod 4 is rotated (see FIG. 1). When rotating in the direction, the contact portion 2d of the blocking rod 2 comes into contact with the stopper 2c fixed to the valve chamber 7, and the end push plate 4
The lower part of one side of the stopper rod 2 is locked by being held against the tip 2b of the stopper rod 2, thereby disabling the operation of the electromagnetic safety valve device B by pushing the operation button 3. Therefore, the safety valve V ₃ and the appliance tap V ₄ of the electromagnetic safety valve device B will not be opened by mistake, and the valve stem 13 will be
Figure) Even if the machine moves to the right and the automatic gas valve _V1 is opened, no raw gas is released.

Note that during water flow combustion, the blocking rod 2 is located above the operating rod 4, and there is no problem when the operating rod 2 returns to the upper position.

In the above embodiment, the present invention is applied to a single operation button, but it goes without saying that the present invention can also be applied to a system having separate ignition buttons and extinguishing buttons.

(Effects of the device) As explained above, this device disables the ignition operation using the operation button during abnormal conditions when water is flowing first to the heat exchanger, and allows the operation only during normal conditions when water is not flowing. This eliminates the risk of raw gas being released during ignition and explosion and ignition, making it safe. In addition, its simple structure means that it can be attached to conventional equipment with only slight modifications. moreover,
In the event of an abnormal situation where water is flowing first to the heat exchanger, the pressing force of the operating 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, since the blocking rod and the electromagnetic safety valve device are operated respectively through the lever lever and the operating lever, the water heater can be used safely for a long period of time without adversely affecting each other when locked.

[Brief explanation of drawings]

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,
Fig. 3 is a sectional view of only the main parts, Fig. 4 is a front view showing an example of the stroke regulating means for the operation button, Fig. 5 is its line diagram, and Fig. 6 is a developed sectional view of an application example. . A... Hydraulic response device, 1... Lever rod, 2... Blocking rod, 3... Operation button, B... Electromagnetic safety valve device, 4
...Operation rod, C...Heat exchanger.

Claims (1)

[Scope of utility model registration request] A blocking rod 2 is provided which is interlocked with the hydraulic response device A via a lever rod 1, and an operating rod 4 that operates an electromagnetic safety valve device B in conjunction with an operating button 3 is connected to the blocking rod 2 when the heat exchanger C is activated. In an abnormal situation where water is flowing in advance to the heat exchanger C, it engages and restricts its operation, and in a normal situation when water is not flowing to the heat exchanger C, the restriction by the blocking rod 2 is released and the operation is enabled. A safety device for a stop-start water heater that is characterized by: