JPS6143079Y2 - - Google Patents

Description

[Detailed description of the invention] The applicant of the present application has previously proposed a device of this type, as seen in Utility Model Application No. 57-135933, which is equipped with a main burner for heating a heat exchanger and a constant fire burner. A manual valve on the upstream side that is opened by a manual operation member and an automatic valve on the downstream side that is opened in conjunction with a hydraulic response member when water flows through the heat exchanger are interposed in the fuel passage leading to the heat exchanger. In the water heater, the continuous flame passage leading to the constant flame burner is branched from the middle of the two valves, and a lock member is provided which engages with the operating member and operates to prevent the operation thereof. proposed a type in which the locking member is connected to the hydraulic response member so that its operation is released when water is not flowing. When the manual operating member is returned to the starting position, the manual valve closes to extinguish the fire, and at this time, the locking member is actuated and locks the operating member due to continued water flow, thus making it impossible to operate it again. ,
At this time, there is a gap to some extent between the lock member and the step portion of the operating member that engages with the lock member, and therefore the operating member is repeatedly pressed within the gap to loosen the manual valve to some extent. It is possible to open the valve repeatedly in both cases, and when the water flow is stopped from this state, the above-mentioned lock is released, and the operating member is pressed to restart the ignition, the previously released raw gas will be re-ignited. Explosive ignition may occur, which is undesirable.

The purpose of the present invention is to obtain an apparatus free from such inconveniences, and is provided with a main burner 2 for heating a heat exchanger 1 and a constant-fire burner 3, and the main burner 2
In the fuel passage 4 leading to the heat exchanger 1, there is an upstream manual valve 6 which is opened by pressing the manual operating member 5 from the front to the rear, and an upstream manual valve 6 which is connected to the hydraulic response member 7 by passing water to the heat exchanger 1. An automatic valve 8 on the downstream side that is opened when the valve is opened is interposed therebetween, and a normally-fired passage 9 leading to the normally-fired burner 3 is branched from an intermediate point between the two valves 6 and 8, and further engaged with the operating member 5. A locking member 10 is provided which operates to prevent the water from flowing, and the locking member 10 is connected to the hydraulic response member 7 so that its operation is released when water is not flowing.
An operating rod 13 having a push button 12 at its front end constituting the operating member 5 is divided into a front half 13b and a rear half 13c which face each other with a small distance 13a. A stepped portion 13d formed on the front half portion 13b can freely cooperate with the locking member 10.

To describe in detail the illustrated operating member 5,
Push button 1 inserted in the operation panel 11 on the front of the water heater
2, and the fuel passage 4 extends rearward coaxially thereto.
The manual valve 6 is composed of an operating rod 13 that is inserted into the operating rod 13, and a lever 14 that is engaged with a play at the tip thereof, and the manual valve 6 includes a shutoff valve 6a fixed to the operating rod 13; A safety valve 6 facing the operating end of the lever 14
According to the pressing operation against the return spring 12a from the starting end position of the push button 12, the shutoff valve 6 is opened via the operating rod 13 at the intermediate position.
The opening of the valve a and then the opening of the safety valve 6b via the lever 14 at the end position are sequentially applied. Opening an ignition passage 16 leading to an ignition burner 15 arranged in parallel with the constant flame burner 3;
As clearly shown in FIG. 5, the operating rod 13 is formed with an ignition valve 17 having a small diameter portion that operates to communicate the ignition passage 16 with the fuel passage 4 at the end position, and thus the operation of the push button 12. According to the pressing operation to the terminal position, gas is supplied to the normally lit burner 3 via the safety valve 6b and the cutoff valve 6a, and to the ignition burner 15 via the ignition valve 17. I made it.

When the push button 12 is released from the pressure at the end position, its return operation is stopped at the intermediate position by a claw piece 18 that engages with a protrusion 12b formed therein, and when a separately provided fire extinguishing button 19 is pressed, the claw piece 18 is stopped. When the piece 18 is disengaged, it is returned to the starting position.

FIG. 6 shows a control circuit comprising an igniter 22 connected to a power source 21 via an ignition switch 20 which is closed in its terminal position in conjunction with the push button 12;
The ignition burner 1 is ignited by the igniter 22 in the end position.
After this ignition, the solenoid 24 of the safety valve 6b is energized by the electromotive force of the thermocouple 23 facing the normally lit burner 3. The safety valve 6b
until the safety valve 6 is held open by suction.
A capacitor 25 is provided to keep the valve open.

That is, the capacitor 25 is normally connected to the power source 21 and charged by the changeover switch 26 linked to the push button 12, and is connected to the solenoid 24 when the push button 12 is pushed beyond the intermediate position. Thus, after the burner 3 is ignited at the terminal position, the push button 12 is immediately returned to the intermediate position and the lever 14 of the safety valve 6b is activated.
Even when the pressure is released, the safety valve 6b is held open by the excitation of the solenoid 24 caused by the discharge from the capacitor 25.

The hydraulic response member 7 described above is a diaphragm 7a.
The lower chamber 7 in the drawing is partitioned by the diaphragm 7a.
b is communicated with the bench lily portion 28 interposed in the water supply channel 27 leading to the heat exchanger 1, and when water flows, the chamber 7
The diaphragm 7a is adapted to be displaced downward by a decrease in the internal pressure of the diaphragm 7a.

In the illustrated example, the automatic valve 8 described above is attached to the operating rod 29 connected to the diaphragm 7a.
According to the displacement of the diaphragm 7a, the operating rod 2
The valve is configured to be opened mechanically via the lever 9, and the locking member 10 described above is attached to the operating lever 29.

To explain this in more detail, the operating rod 29 is inserted into the fuel passage 4 so as to be moved back and forth at right angles to the operating rod 13, and the automatic valve 8 is located between the operating rods 29 and the locking member 10 is located at its lower end. When water is flowing, the locking member 10 is advanced to the lower locking position facing the movement locus of the step 13d formed on the outer periphery of the operating rod 13, and when water is not flowing, the locking member 10 is moved to the upper locking position. It is now possible to move to a certain position. The locking member 10 is attached to the operating rod 29 so as to be movable upwardly against the spring 10a. In the drawings, reference numeral 10b indicates a guide for the locking member 10, and reference numeral 8a indicates a return spring for the automatic valve 8.

Next, to explain its operation, when water is flowing, press button 1.
When the locking member 2 is pressed from the starting end position, the locking member 10 in the locking position is attached to the stepped portion 13d of the operating rod 13.
are engaged as shown in the second figure to prevent further pressing operation, and the manual valve consisting of the shutoff valve 6a and the safety valve 6b is operated by the manual operating member 5 consisting of the push button 12, the operating rod 13, and the lever 14. Opening of valve 6 Opening of valve 6 is prevented.

In this case, when the locking member 10 is not present and the manual valve 6 is opened, the automatic valve 8 has already been opened by water flow, so the main burner 2 is opened at the same time as the manual valve 6 is opened. If a large amount of raw gas is released from the lock member 10, resulting in explosive ignition during ignition, or if welding failure occurs when the ignition switch 20 is open, there is a risk that the raw gas will continue to be released. Accordingly, opening of the manual valve 6 is prevented as described above, so that such a risk does not occur.

When the water flow is stopped, the locking member 10 is moved to the release position, so the manual operation member 5 opens the manual valve 6 and ignites the normally lit burner 3, and the water flow is stopped thereafter. When the automatic valve 8 is opened at the time of water flow, the main burner 2 is smoothly ignited by the normally lit burner 3, and in this case, the push button 12 is locked at an intermediate position and the operating rod 13 is turned off when water is flowing. The locking member 10 comes into contact with the stepped portion 13d, but at this time, the locking member 10 moves upward with respect to the operating rod 29 against the spring 10a, as shown in FIG. This does not prevent the automatic valve 8 from opening.

In the above embodiment, the automatic valve 8 is replaced by the hydraulic responsive member 7.
In the above embodiment, the manual valve 6 is replaced with the shutoff valve 6a, and the present invention is also applicable to a case where the valves are electrically linked as in the conventional example. and the safety valve 6b, but it is of course possible to omit one of them.

Although the above is not particularly different from what was proposed earlier, according to the present invention, as described above, the operating rod 13 having the push button 12 at the tip constituting the operating member 5 is placed facing each other with a small gap 13a. Front half 13b
It is constructed by being divided into a rear half part 13c and a step part 13d formed in the front half part 13b, which cooperates with the locking member 10, as shown in the second figure. When the gap 13e in the locked state is, for example, 1 mm, the gap 13a between the two halves 13b and 13c is, for example, 1.5 mm.

To explain its operation, as mentioned above, when the fire extinguishing button is pressed by mistake during use and the operating rod 13 is returned to the starting position, the manual valve 6 closes and extinguishes the fire. The member 10 moves down and locks the operating rod 13. This state is clearly shown in FIG. 2, for example, and the operating rod 13 can be pressed repeatedly within the gap 13e between it and the locking member 10. The valve 6 is repeatedly opened to introduce raw gas, but according to the present invention, there is no such opening. That is, although the operating rod 13 is pressed within the range of the gap 13e, there is a gap 13a in the middle of the operating rod 13 that is somewhat larger than this, so that pressing the push button 12 does not involve opening the valve. There was no explosive ignition even after subsequent re-ignition.

According to the present invention, although the push button 12 is pressed within the gap 13e between the push button 12 and the lock member 10, it escapes within the gap 13a and the manual valve 6 is not opened at all, and this opening is repeated. This eliminates the danger of explosion and ignition associated with
3 into both halves 13b and 13c, it is simple and has the advantage of being inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a cut-away side view of the essential parts of an example of the water heater of the present invention, Figs. 2 and 3 are cut-away sectional views explaining the operation of the locking member, respectively, and Fig. 4 is an enlarged cut-away cross-section of the essential parts. 5 is a cutaway sectional view of the ignition valve incorporated in the manual operation member in an open state, and FIG. 6 is a circuit diagram thereof. 1... Heat exchanger, 2... Main burner, 3... Pilot burner, 4... Fuel passage, 5... Manual operation member,
6... Manual valve, 7... Hydraulic response member, 8... Automatic valve, 9... Normal fire passage, 10... Lock member, 12
...Push button, 13...Operation rod, 13a...Gap, 1
3b, 13c...Both halves, 13d...Stepped part.

Claims (1)

[Scope of utility model registration request] A fuel passage 4 is provided with a main burner 2 that heats the heat exchanger 1 and a constant-fire burner 3, and is connected to the main burner 2.
There is an upstream manual valve 6 that is opened by pressing the manual operating member 5 from the front to the rear, and a downstream manual valve that is opened in conjunction with the hydraulic response member 7 when water flows through the heat exchanger 1. A side automatic valve 8 is interposed therebetween, and a normal fire communication 9 connected to the normal fire burner 3 is branched from between the two valves 6 and 8, and further engaged with the operating member 5 to prevent its operation. The operating member 5 is provided with a locking member 10 that operates as shown in FIG.
The operating rod 13 having a push button 12 at the front end constituting the is divided into a front half 13b and a rear half 13c which face each other with a small distance 13a, and the front half A control device for pressing operation in a water heater, in which a stepped portion 13d formed on a portion 13c can freely cooperate with the locking member 10.