JPS6143078Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for pressing operation in a water heater.

The applicant of the present application has previously proposed a device of this type, for example, as seen in Utility Model Application No. 135933/1985, which is equipped with a main burner for heating a heat exchanger and a constant fire burner, and has a fuel passage connected to the main burner. an upstream manual valve that is opened by pressing the manual operating member to an intermediate position to activate the igniter at the end position of the pressing operation; In a type in which an automatic valve on the downstream side that is opened is interposed therebetween, and a normally-fired passage leading to the normally-fired burner is branched from the middle of both valves, the valve is engaged with a stepped portion formed on the operating member. A lock member is provided that operates to prevent the member from being pressed to the intermediate position, and the lock member is connected to the hydraulic response member so that the operation is released when water is not flowing. However, in this case, it is preferable that the operation member is prevented from being operated again in a water-flowing state after being operated once. That is, when the operating member is operated once, there is an ignition error, and when water is passed in this state, the manual valve opens and a large amount of raw gas is released into the main burner. Since there is a risk of explosive ignition due to the spark generated by re-operation, it is preferable that such re-operation is prevented, and further preferably, this prevention is achieved by means of the locking member.

The purpose of the present invention is to obtain a device that meets such requirements, and is equipped with a main burner 2 for heating a heat exchanger 1 and a constant-fire burner 3, and a fuel passage connected to the main burner 2. 4, an upstream manual valve 6 that is opened by pressing the manual operating member 5 to the intermediate position, which activates the igniter 22 at the end position of the pressing operation from the front to the rear, and the heat exchanger 1; An automatic valve 8 on the downstream side is interposed which is opened in conjunction with the hydraulic response member 7 when water flows through the valve, and a normally-fired passage 9 leading from the middle of the valves 6 and 8 to the normally-fired burner 3 is provided. A stepped portion 13a is branched and further formed on the operating member 5.
A lock member 10 is provided which operates to engage with the member 5 to prevent the member 5 from being pressed to the intermediate position, and the lock member 10 is connected to the hydraulic response member 7, so that the lock member 10 is not operated when water is not flowing. In the release type, a second step portion 13b is located at the front position of the step portion 13a and cooperates with the lock member 10 to prevent the operation member 5 from being pressed to the terminal position. It is characterized by having the following.

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 6a opens via the operating rod 13 at the intermediate position, and then At the end position, the safety valve 6b is sequentially opened via the lever 14, and furthermore, in the illustrated example, the insertion wall of the operating rod 13 of the fuel passage 4 is connected to the normally-fired burner 3. The ignition passage 16 connected to the ignition burner 15 arranged in parallel is opened, and the operating rod 13 is provided with a small diameter which operates to communicate the ignition passage 16 with the fuel passage 4 in the terminal position as clearly shown in FIG. Thus, when the push button 12 is pressed to the terminal position, the normally lit burner 3 and the ignition valve are connected to each other via the safety valve 6b and the cutoff valve 6a. Gas was supplied to the ignition burner 15 through the ignition burner 17.

The push button 12 has a claw piece 18 that engages with a protrusion 12b formed on the push button 12 when the push button 12 is released from the terminal position.
The return operation is stopped at the intermediate position, and the claw piece 18 is pressed by pressing the separately provided fire extinguishing button 19.
It is now possible to return to the starting position by releasing the engagement.

FIG. 5 shows a control circuit in which the igniter 22 is of the type 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, and in which the igniter 22 is closed in its terminal position. The safety valve 6b is caused by the electromotive force of the thermocouple 23 facing the normally lit burner 3 after this ignition. A capacitor 25 is provided to keep the safety valve 6b open until the solenoid 24 of the safety valve 6b is energized by the electromotive force of the solenoid 24 and the safety valve 6b is held 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 stepped portion 13a 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 lock 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 position, the locking member 10 in the locking position is attached to the stepped portion 13a 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. 6 is prevented from opening.

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 that the manual operation member 5 opens the manual valve 6 and the igniter 22 operates to ignite the constant flame burner 3. When the automatic valve 8 is subsequently opened for water flow, the main burner 2 is smoothly ignited by the pilot burner 3, and in this case, the push button 12 is locked at the intermediate position and the water flow is stopped. At this time, the locking member 10 comes into contact with the stepped portion 13a of the operating rod 13, but at this time, the locking member 10 moves upward with respect to the operating rod 27 against the spring 10a as shown in FIG.
This does not impede the downward movement of the operating rod 27, that is, the opening of the automatic valve 8.

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 made up of a shutoff valve 6a and a safety valve 6b. However, it is of course possible to omit one of them.

Although the above is not particularly different from what was previously proposed, according to the present invention, as described above, a second step portion is provided in front of the step portion 13a and engages with the step portion 13a when the locking member 10 is in the operating position. 13b, and in the illustrated example, the front position of the stepped portion 13a is enlarged to form the stepped portion 13b.

To explain its operation, when the manual operation member 5 is operated to open the manual valve 6 and the igniter 22 while the water flow is stopped as described above, an ignition error may occur. Then, it is conceivable that the member 5 to be reactivated of the igniter 22 may be operated again from the state in which water continues to flow, and as described above, there is a risk of explosion and ignition. The present invention eliminates such inconvenience, and in the above-mentioned state of water flow, the locking member 10 moves downward and engages with the second stepped portion 13b as clearly shown in FIG. 5 is prevented from further pressing operation by the lock member 10, in other words, the re-operation to reactivate the igniter 22 is prevented.

In this way, according to the present invention, there is no danger of having to operate the igniter 22 again after ignition error occurs and water continues to flow, and its configuration is simply a step in the previous proposal. It is sufficient to provide the second stepped portion 13b in front of the portion 13a, which is simple and can be obtained at low cost. Note that when a gap is provided between the lock member 10 and the step portion 13a to ensure that the lock member 10 enters the step portion 13a, the shutoff valve 6a may open slightly even when water is flowing. However, as clearly shown in FIG. 1, the operating rod 13 is divided into a front half 13c and a rear half 13d, and there is a gap larger than the above-mentioned gap between the front half 13c and the rear half 13d. By providing a gap, even if the push button 12 is pressed by mistake while water is flowing, the blocking piece 6a will not be pushed open, making it safe.

[Brief explanation of the drawing]

Fig. 1 is a cut-away side view of the essential parts of one 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, and Fig. 4 is an assembled view of the manual operation member. 5th cross-sectional view of the ignition valve in the open state
The figure is its circuit diagram. 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, 13
a, 13b...stepped portion, 22...igniter.

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.
An upstream manual valve 6 is opened by pressing the manual operating member 5 to the intermediate position, which activates the igniter 22 at the end position of the pressing operation from the front to the rear.
By passing water through the heat exchanger 1, the hydraulic response member 7
An automatic valve 8 on the downstream side that opens in conjunction with the above is interposed, and a normally-fired passage 9 connected to the normally-fired burner 3 is branched from an intermediate point between the two valves 6 and 8, and further connected to the operating member 5. A locking member 10 is provided which operates to engage with the formed step portion 13a to prevent the member 5 from being pressed to the intermediate position, and the locking member 10 is connected to the hydraulically responsive member 7 to prevent the non-contact member from being pressed. In the type that is designed to be deactivated when water is flowing,
A water heater characterized in that a second step portion 13b is provided at a front position of the step portion 13a and cooperates with the lock member 10 to prevent the operation member 5 from being pressed to the terminal position. Press operation control device.