JPS6137967Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an operating device for a water heater.

The present applicant had previously applied for this type of device in Utility Application No. 57-
According to No. 135933, a main burner and a constant-fire burner are provided to heat a heat exchanger, and a fuel passage leading to the main burner includes an upstream manual valve that is opened by a manual operation member, and a fuel passage connected to the main burner. In a water heater, an automatic valve is interposed which is opened in conjunction with a water pressure responsive member when water flows through the water heater, and a normal-heat passage leading to the normal-heat burner is branched from an intermediate point between the two valves. A lock member is provided which can be freely switched between a lock position where the operation member is engaged to prevent its operation, and a release position where the engagement is released, and the lock member is interlocked with the hydraulic response member to lock the lock member when water is flowing. so that it switches to the position,
The manual valve can be opened by the operating member only when the automatic valve is closed and water is not flowing, and the normally-fired burner is ignited by gas supply, and the subsequent operation is performed. When the automatic valve is opened by water, the main burner is given spark ignition from the normally-fired burner, and when the automatic valve is opened by water flow, the operating member is not operated. proposed an automatic valve capable of preventing explosion and ignition of raw gas discharged from the main burner. Here, it is desirable that the locking member has a somewhat wider clearance from the erroneously operated member at its release position to prevent it from engaging with the erroneously operated member when water is not flowing due to a manufacturing error or the like. According to this, even if the lock member moves from the release position due to water flow, it is possible to operate the operating member as long as the amount of water flow is small and the lock member remains within the relief width. In the proposed method, since the automatic valve is moved together with the lock member, the automatic valve opens more or less while the lock member is within the relief width, and the operation of the operating member is prevented. Gas may flow to the main burner before igniting the constant burner. accompanied by inconvenience.

In order to eliminate such inconveniences, the present invention aims to provide a device in which the automatic valve is kept closed while the locking member remains within the above-mentioned relief width. The fuel passage 4 connected to the main burner 2 includes an upstream manual valve 6 that is opened by a manual operation member 5, and the heat exchanger. an automatic valve 8 on the downstream side that is opened in conjunction with the hydraulic response member 7 when water flows through the valve 1; Further, a lock member 10 is provided which can be freely switched between a lock position where it engages with the operating member 5 to prevent its operation and a release position where the engagement is released. In a system in which the automatic valve 8 is linked to the hydraulic response member 7 and switched to the lock position during water flow, the automatic valve 8 is linked to the hydraulic response member 7.
The lock member 10 is interlocked with play 8a in the lock member 10.
It is characterized in that the automatic valve 8 is opened after the switching operation to the lock position.

FIG. 1 shows an example of the operation member 5.
The push button 12 is operated on the operation panel 11 on the front side of the water heater, the operation rod 13 extends rearward coaxially with the push button 12 and is inserted into the fuel passage 4, and there is play at the rear end. The manual valve 6 is composed of a shutoff valve 6a fixed to the operating rod 13, and a safety valve 6b facing the operating end of the lever 14. According to the pressing operation of the push button 12 against the return spring 12a from the starting end position, the shutoff valve 6a is opened via the operating rod 13 at the intermediate position, and then via the lever 14 at the terminal position. The safety valves 16b are opened sequentially, and furthermore, in the illustrated example, the opening of the safety valve 16b is connected to the ignition burner 15 arranged in parallel to the normally lit burner 3 on the insertion wall of the operating rod 13 of the fuel passage 4. The ignition passage 16 is opened, and the operating rod 13 is provided with an ignition valve 17 consisting of a small diameter portion that operates to communicate the ignition passage 16 with the fuel passage 4 at the terminal position as clearly shown in FIG. Thus, when the push button 12 is pressed to the terminal position, a connection is made 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. Husband gas was supplied.

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

FIG. 5 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 that is linked to the push button 12, and is connected to the solenoid 24 when the push button 24 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.

Then, the operating rod 29, which is elongated in the vertical direction and connected to the diaphragm 7a, is inserted into the fuel passage 4, and the locking member 10 described above is attached to the lower end of the operating rod 29, so that when water is flowing, the diaphragm 7a is displaced downwardly. When the operating rod 29 moves downward, the locking member 10 locks the operating rod 1.
It is switched to the lower lock position facing the movement locus of the stepped portion 13a formed on the outer periphery of 3, and when water is not flowing, it is switched to the release position above the movement locus with an clearance width _l1 of about 1.8 mm. It is now possible to switch to .
Note that the locking member 10 has a spring 1 attached to the operating rod 29.
It shall be installed so that it can move freely against 0a,
Further, a guide 30 is provided to slidably pass through the lock member 10 so that the guide 30 can reliably receive the operating force of the manual operation member 5 acting on the lock member 10 via the stepped portion 13a. did.

The automatic valve 8 described above is slidably inserted into the operating rod 29 and is normally held in the upper closed position by the spring 8b.
A flange 31 is formed above the automatic valve 8 with a gap therebetween, and this gap allows the above-mentioned play 8 to be reduced.
The width _l2 of this play 8a is set to be about 2.5 mm, for example, larger than the relief width _l1 , and when the operating rod 29 moves downward during water flow, the locking member 10
After the valve is switched from the release position to the lock position beyond the relief width _l1 , the flange 31 comes into contact with the automatic valve 8, so that the automatic valve 8 is opened.

Incidentally, the automatic valve 8 is covered with a rubber cover 8c as a packing material, and the cover 8c is used to provide a gas sealing property for the penetrating portion of the operating rod 29.

In the above proposal, the automatic valve 8 is operated by the operating rod 2.
9 and is adapted to move together with the locking member 10.

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 ignition switch 20, resulting in explosive ignition or welding failure when the ignition switch 20 is open, there is a risk that the raw gas will continue to be released. Since the locking member 10 prevents the manual valve 6 from opening, 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 circumferential surface of the stepped portion 13a, 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. That is, opening of the automatic valve 8 is not hindered.

Here, when operating the manual operation member 5 during water flow, the lock member 10 is not switched from the release position to the lock position due to a small amount of water flow, that is, the lock member 10 is within the relief width _l1 . If so, the operation member 5 can be operated, and if the automatic valve 8 is opened to some extent in this state, raw gas is released from the main burner 2 and ignited before igniting the constant burner 3. When the shock becomes large and the amount of gas supplied to the main burner 2 is small, flashback is likely to occur, but according to the present invention, the above-mentioned play 8a
The automatic valve 8 is opened after the locking member 10 is switched to the locked position, and thus the automatic valve 8 is not opened while the locking member 10 remains within the relief width _l1 . , such inconvenience will not occur.

In the above embodiment, the automatic valve 8 is interlocked with the operating rod 29 with a play 8a, but the invention is not limited to this. For example, as shown in FIG. Separately from the valve 29, a valve rod 32 connected to the automatic valve 8 is provided, and this is inserted into the lower chamber 7b of the hydraulic response member 7, and the valve rod 32 is directly connected to the diaphragm 7a with a play 8a. Alternatively, as shown in FIG. 7, an operating rod 13 may be installed laterally through the chamber 7b.
The operating rod 29 is vertically movably crossed over the operating rod 13 at the two prongs or elongated holes at its lower end, and the locking member 10 that engages with the stepped portion 13a of the operating rod 13 is attached to the operating rod 29. The valve rod 32 may be opposed to the lower end of the operating rod 29 with a play 8a.

In this way, according to the present invention, the automatic valve 8 is interlocked with the hydraulic response member 7 with a play 8a,
The automatic valve 8 is opened after the locking member 10 is switched to the locking position, and an escape width for the manual operating member 5 in the release position of the locking member 10 is provided in consideration of manufacturing errors. Even if the relief width is relatively large, the automatic valve 8 can be prevented from opening when the locking member 10 is within this relief width, and the gas to the main burner can be prevented from opening before the constant flame burner is ignited. This has the effect of reliably preventing air supply and further improving safety.

[Brief explanation of the drawing]

Figure 1 is a cutaway side view of the main parts of an example of the proposed device;
Figures 2 and 3 are cross-sectional views explaining the operation of the locking member, Figure 4 is a cross-sectional view of the ignition valve incorporated in the manual operation member in the open state, and Figure 5 is its circuit. 6 and 7 are cutaway side views of essential parts of other embodiments, respectively. 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, 8a... Play, 9... Constant fire passage, 10... Lock member.

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,
A manual valve 6 on the upstream side that is opened by the manual operation member 5 and an automatic valve 8 on the downstream side that is opened in conjunction with the hydraulic response member 7 when water flows through the heat exchanger 1 are interposed. , a constant flame passage 9 leading to the constant flame burner 3 is branched from an intermediate point between the two valves 6 and 8;
Furthermore, a lock member 10 is provided which can be freely switched between a lock position in which it engages with the operating member 5 to prevent its operation, and a release position in which it disengages, and the lock member 10 is interlocked with the hydraulic response member 7. In a device that is configured to switch to the lock position when water is flowing, the automatic valve 8 is interlocked with the hydraulic response member 7 with a play 8a, and after the lock member 10 is switched to the lock position, the automatic valve 8 is moved to the lock position. 1. An operating device for a water heater, characterized in that eight valve openings are given.