JPH0136048Y2 - - 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 invention has previously proposed a device of this type, as seen in Utility Model Application No. 1135/1983, which is equipped with a main burner for heating a heat exchanger and a constant flame burner, and has a fuel passage connected to the main burner. , a first 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; A downstream automatic valve that is opened and a second manual valve that is opened by pressing the manual operating member to the terminal position are interposed, and a regular valve that passes from between the two valves to the normally lit burner is provided. A locking member is provided which operates to branch the fire passage and further engage a step formed in the operating member to prevent the member from being pressed to the intermediate position, and the locking member is connected to the hydraulically responsive member. Connected to
A second stepped portion is disposed in front of the stepped portion so that its operation is released when water is not flowing, and cooperates with the locking member to prevent the operating member from being pressed to the terminal position. In this case, the operation member is prevented from being operated again with water flowing after it has been operated, but in this case, once the water flow is stopped and the water is flowing again, the operating member is prevented from operating again. When this is repeated, the locking member moves back and forth repeatedly in conjunction with the hydraulic response member.

However, if there is no gap in front of the second step, the locking member will be prevented from advancing, and if the operating member is operated again in this state, there is a danger that the generated spark will cause an explosion and ignition. In order to avoid such a risk, it is conceivable to provide a gap in front of the second step, but in this case, the manual operation member cannot be pressed from the intermediate position to the final position where the igniter should operate. Although no spark is generated since the second manual valve opens slightly by the gap until it is stopped, raw gas is released and collected inside the water heater body. Therefore, once the fire has been extinguished, if it is re-ignited, it may explode.

The purpose of the present invention is to obtain a device that eliminates such inconvenience, 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
A first manual valve 6a that is opened by pressing the manual operating member 5 to an intermediate position, which should activate the igniter 22 at the end position of the pressing operation.
, a downstream automatic valve 8 which is opened in conjunction with a hydraulic response member when water passes through the heat exchanger 1, and a downstream automatic valve 8 which is opened by pressing the manual operation member 5 to its terminal position. 2 manual valve 6b is interposed, and
A normally-fired passage 9 leading to the normally-fired burner 3 is branched from between the two valves 6, 8, that is, the first and second manual valves 6a, 6b, and the automatic valve 8, and a stage formed in the operating member 5 is further added. A lock member 10 that engages with the portion 13a and operates to prevent the member 5 from being pressed to the intermediate position is provided, and the lock member 10 is connected to the hydraulic response member 7 so that the lock member 10 is engaged with the water pressure member 7 when water is not flowing. A second stepped portion 13b is disposed at a forward position of the stepped portion 13a so that the actuation is released, and cooperates with the locking member 10 to prevent the pressing operation 1 of the operating member 5 to the terminal position. In the case where the second step portion 13b has a first
The second step portion 13b is engaged with the locking member 10 with a gap l, and has the first gap l.
In order to prevent the second manual valve 6b from opening when the manual operation member 5 is prevented from being pressed from the intermediate position to the final position, a gap l is provided on the operating end side of the second manual valve 6b from the first gap l. It is characterized by providing a second gap L which is also large.

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 extending forward coaxially with the fuel passage 4.
The manual valve 6 is a first manual valve fixed to the operating rod 13. The pressure applied to the return spring 12a from the starting end position of the push button 12 is as follows: According to the operation, the shutoff valve 6a is opened via the operating rod 13 in the intermediate position and then the lever 1 is opened in the end position.
4, the safety valve 6b is sequentially opened via the fuel passage 4.
An ignition passage 16 leading to the ignition burner 15 arranged in parallel with the constant-fire burner 3 is opened in the insertion wall of the operating rod 13, and the operating rod 13 is inserted at the terminal position as shown in FIG. An ignition valve 17 is formed with a small diameter portion that operates to communicate the ignition passage 16 with the fuel passage 4, and when the push button 12 is pressed to the terminal position, the safety valve 6b and the cutoff valve are closed. Gas is supplied to the normally lit burner 3 via the ignition valve 6a, and to the ignition burner 15 via the ignition valve 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 1 is operated by pressing a separately provided extinguishing button 19.
When the engagement is released at step 8, it returns to the starting position.

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 opened in its terminal position in conjunction with the push button 12; 22 provides a transfer ignition to the normally lit burner 3 via the ignition burner 15, and furthermore, after this ignition, the electromotive force of the thermocouple 23 facing the normally lit burner 3 causes the safety valve 6b to be ignited. A capacitor 25 is provided which keeps the safety valve 6b open when the solenoid 24 is energized.

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.
It is composed of a known water governor using a diaphragm 7a, and is divided by a lower chamber 7b in the drawing.
is communicated with the bench lily portion 28 interposed in the water supply channel 27 leading to the heat exchanger 1, and as water flows through the chamber 7b.
As the internal pressure decreases, the diaphragm 7a is displaced downward.

In the illustrated example, the automatic valve 8 described above is attached to the operating rod 29 connected to the diaphragm 7a, and the displacement of the diaphragm 7a causes the operating rod 29 to move.
The valve is configured to be opened mechanically via the lever 29, and the locking member 10 described above is attached to the operating rod 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 two and the lock member is located below it. 10 is attached, and when water is flowing, the locking member 10 is advanced to the lower locking position facing the movement trajectory of the step 13a formed on the outer periphery of the operating rod 13, and when water is not flowing, the locking member 10 is advanced to the upper locking position. It is now possible to move to the release position. The locking member 10 is attached to the operating rod 29 so as to be movable upwardly against the spring 10a.

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. Then, when the automatic valve 8 is opened for subsequent 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 29 against the spring 10a as shown in FIG.
This does not impede the downward movement of the operating rod 29, 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 connected to the cutoff valve 6a and the safety valve 6b. However, it is of course possible to omit one of them.

Furthermore, as described above, the manual operating member 5 is provided with a second step 13b in front of the step 13a, which engages with the lock member 10 in the operating position; The front position of the portion 13a is enlarged to form the second stepped portion 13b.

To explain its operation, as described above, when the manual operation member 5 is operated to open the manual valve 6 and operate the igniter 22 while the water flow is stopped, an ignition error occurs. In some cases, it is conceivable that the member 5 to be operated again of the igniter 22 may be operated again from a state in which water is being passed, and as described above, there is a risk of explosion and ignition. However, in the water flowing state described above, the locking member 10 moves downward and reaches the third position.
engages with the second step portion 13b as clearly shown in the figure;
In this way, the operating member 5 is prevented from further pressing operation by the locking member 10, in other words, the re-operation to reactivate the igniter 22 is prevented, so that the risk of explosion and ignition is possible. be avoided.

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. 6, 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 accidentally pressed while water is flowing, the shutoff valve 6a will not be pushed open, making it safe.

The above is not particularly different from what was proposed earlier, but
According to the present invention, as described above, the second step portion 13
Since the lock member 10 is engaged with the lock member 10 with a first gap 1 at the position b, the lock member 1 is closed when the manual operation member 5 is re-operated in the water-flowing state and then water is re-flown.
0 can be ensured to enter the second step portion 13b.

Furthermore, according to the present invention, when the pressing operation of the manual operation member 5 from the intermediate position to the terminal position is prevented by the second step portion 13b having the first gap l, the second step portion 13b
In order to prevent the manual valve 6b from opening, a second gap larger than the first gap l is provided on the operation end side of the second manual valve 6b.
A gap L is provided between the tip of the protrusion 14a, which is the operating end of the lever 14, and the operating end of the safety valve 6b, which is the second manual valve, as shown in the first section. Since a large second gap L is provided, the second step portion 13 of the lock member 10
It is possible to reliably eliminate the inconvenience caused when the first gap l is provided to ensure intrusion into the area b.

To explain this in detail, when the first gap l is provided, the manual operation member 5 is moved from the intermediate position to the igniter 22.
The second manual valve 6b advances slightly by the first gap l until it is prevented from being pushed to the final position where it should be operated, so no spark is generated, but the second manual valve 6b
The valve opens slightly due to the gap, and raw gas is released and accumulates inside the water heater body. Therefore, if the fire is extinguished once and then it is reignited, there is a problem that it will explode and ignite. However, according to the present invention, a second gap L larger than the first gap L is provided on the operation end side of the second manual valve 6b. Since this is provided, such inconvenience can be reliably eliminated and safety can be achieved.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view of the water heater of the present invention when the manual operation member is in an intermediate position; FIGS. 2 and 3 are cutaway sectional views illustrating the operation of the locking member, respectively;
Figure 4 is a cutaway cross-sectional view of the ignition valve incorporated in the manual operation member in the open state, Figure 5 is its circuit diagram, and Figure 6 is the circuit diagram.
The figure is a cutaway side view of essential parts of an example of the water heater of the present invention. 1... Heat exchanger, 2... Main burner, 3... Constant fire 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...Step part, 13b...Second step part, 22...Igniter, l...First gap, L...Second gap.

Claims (1)

[Scope of utility model registration request] It is equipped with a main burner 2 and a constant fire burner 3 that heat the heat exchanger 1, and a fuel passage 4 connected to the main burner 2,
At the end position of the pressing operation, the first manual valve 6a is opened by pressing the manual operating member 5 to the intermediate position to activate the igniter 22, and the hydraulic response member 7 is opened by passing water to the heat exchanger 1. An automatic valve 8 on the downstream side that opens in conjunction with this, and a second manual valve 6b that opens when the manual operation member 5 is pressed to the terminal position are interposed, and both the valves 6 and 8 are interposed. The normally-fired passage 9 leading to the normally-fired burner 3 is branched from the middle of the switch, and further engages with the stepped portion 13a formed on the operating member 5 to prevent the member 5 from being pressed to the intermediate position. A locking member 10 is provided which operates as described above.
0 is connected to the hydraulic response member 7 so that its operation is released when water is not flowing, and the stepped portion 13
In the type including a second step 13b at the front position of a, which cooperates with the lock member 10 to prevent the operation member 5 from being pressed to the terminal position, the second step 13b A first gap 1 is provided between the locking member 10 and the locking member 10, and the second step 13b having the first gap 1 is used to press the manual operating member 5 from the intermediate position to the final position. When the second manual valve 6b is blocked, the second manual valve 6b is opened.
A press operation control device for a water heater, characterized in that a second gap L larger than the first gap L is provided on the operation end side of the manual valve 6b.