JPH01163522A - Gas control device - Google Patents

Abstract

PURPOSE:To enable an electromagnetic safety valve to be positively closed when a flame failure occurs and prevent a discharging of raw gas by a method wherein the electromagnetic safety valve is pressed from a position over an intermediate position of a pushing operating lever to its terminal end position and opened. CONSTITUTION:A pushing operating lever 11a is provided with a push-push mechanism 17 for use in performing a pushing operation from a starting end position A to a terminal end position through an intermediate position C, engaging with it at an intermediate position C returning from a terminal end position B to the starting position A, and returning it to the starting end position A through a re-pressing operation from said intermediate position C, and an opening or closing valve 4 installed in a gas supplying passage 3 communicating with a burner 2 is opened at the intermediate position C of the operating lever 11a. With this arrangement, the electromagnetic safety valve 5 controlled by a flame sensor 8 detecting a pressure or an absence of the flame is installed in said gas supplying passage 3 in series with said opening or closing valve 4. The electromagnetic safety valve 5 is pressed to be opened through its pressing operation from a position over the intermediate position C of the pressing operating lever 11a to the terminal end position B. In this way, in case that an ignition of the gas burner 2 is failed or in case that a flame failure occurs during combustion, the electromagnetic safety valve 5 can be positively closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a push-button type gas control device used in gas appliances such as gas instantaneous water heaters and gas stoves.

Conventional pushing operation levers include a pressing operation from a starting position to an intermediate position to a terminal position, locking the lever at an intermediate position where it moves back from the terminal position to the starting position, and pressing again from the intermediate position. In practice, a push-push mechanism is provided to return the lever to the starting position by operation, and an on-off valve interposed in the gas supply path connected to the burner is opened at the intermediate position of the push lever. It is known from Publication No. 43-21740.

In such a system, an electromagnetic safety valve is installed in the gas supply path in series with the on-off valve, and when there is no flame due to misfire, etc., the electromagnetic safety valve closes the gas supply path to prevent gas from being released. However, when the electromagnetic safety valve is pressed open in conjunction with the push rod to supply gas to the gas burner and ignite it, for example, if the ignition fails or for some reason during combustion, If the fire is extinguished, the electromagnetic safety valve must be securely closed to prevent the release of raw gas.

The object of the first invention is to obtain a device that satisfies such a demand, and the first invention has a push operation lever that allows a push operation from a starting position to an intermediate position to a terminal position, and a return operation from the terminal position to a starting position. A push-push mechanism is provided that locks the operating rod at an intermediate position and returns it to the starting position by pressing again from the intermediate position. An electromagnetic safety valve controlled by a flame sensor that detects the presence or absence of a flame is inserted in the gas supply path in series with the on-off valve. The invention is characterized in that the electromagnetic safety valve is pressed open when the push lever is pushed from a position beyond the intermediate position to a terminal position.

The object of the second invention is to obtain a device in which the electromagnetic safety valve can maintain the closed state even when the push lever is pressed again to close the opening/closing valve when ignition fails in the first invention. , and the push operation rod is engaged in a pressing operation from a starting position to an intermediate position to a terminal position, and is locked at an intermediate position where it moves back from the terminal position to a starting position, and from the intermediate position. A push-push mechanism is provided to return the push rod to the starting position by pressing it again, and at the intermediate position of the push rod, an on-off valve interposed in the gas supply path connected to the burner is opened. was made,
An electromagnetic safety valve controlled by a flame sensor that detects the presence or absence of a flame is inserted in series in the gas supply path, and the electromagnetic safety valve is pushed from a position beyond the intermediate position of the pushing lever to a terminal position. In a device that presses to open the valve in conjunction with the intermediate position, the stroke when returning the push lever to the starting end 0 position by the press operation from the intermediate position must be within a short range so that the stroke does not exceed the closing position of the electromagnetic safety valve. It is characterized by having a stroke.

Next, the present invention will be explained with reference to the illustrated embodiments.

Figure 1 shows an embodiment in which the present invention is applied as a gas control device for a gas instantaneous water heater. Valve (4)
and an electromagnetic safety valve (5) on the upstream side thereof, and a water governor (6) that opens when water is flowing to the heat exchanger (1) downstream of the on-off valve (4). A water pressure-responsive valve (7) to be operated is interposed, and a thermocouple (8) as a flame sensor is placed on the side of the burner (2) to detect the presence or absence of a flame and control the safety valve (5). The pilot burner (2a) facing the igniter (9) and the ignition burner (2b) facing the igniter (9)
) are installed in parallel, and the pilot burner (2a) is opened and closed via the pilot gas passage (3a), and the ignition burner (2b) is opened and closed via the ignition gas passage (3b) and the ignition valve (IG). Valve (4
) connected to the downstream side of the

The ignition valve (10) is composed of a spool valve consisting of a small diameter portion formed at the rear end of the valve rod (4a) of the on-off valve (4), and is coaxial with the valve rod (4a) and extends rearward. Push button (11)
A push operation lever (11a) connected to the push button (11) is opposed to the rear end of the valve lever (4a), and the push button (11) is moved from the starting position A to the intermediate position C and then to the final position B. 2. As shown in Figure 2, it can be pressed freely against a return spring (Ilb), and when the push button (I) is pressed from the starting end position A, the valve rod (4a) is pressed through the push rod (11a). ) is pushed forward, the on-off valve (4) is opened to a predetermined opening degree at intermediate position C, and the ignition valve (1) is pushed forward from intermediate position C to terminal position B.
The safety valve (5) can be opened by pressing the lever 0 which comes into contact with the tip of the valve rod (4a).

FIG. 6 shows the operating circuit of the safety valve (5) and the igniter (9), in which the igniter (9) is connected to the power source battery 03 via the ignition switch aΦ, and the battery is connected via the changeover switch 09. (13 and the solenoid (5a) of the safety valve (5) are provided with a capacitor ae that can be switched and connected, and each switch a
@■ is arranged so as to be interlocked with a pair of protrusions (14aH15a) on the push button (11a) as shown in the third figure, and the push button (11a) is pressed by the push button (11). According to the pressing operation to the terminal position B, the ignition switch aΦ is closed by being pushed by the protrusion (14a), the igniter (9) is activated, and the pilot burner (2b) is activated via the ignition burner (2b). 2
a), and the changeover switch (15) is already connected to the protrusion (15) in the intermediate position C.
a) so that it is switched and connected to the solenoid (5a) side, and after the pilot burner (2a) is ignited, the thermal lightning pair (8) connected to the solenoid (5a) reaches a predetermined temperature. Until it is heated, the safety valve (5) is held open by the discharge from the capacitor aO.

And these valves (4) (5) (10 and switches (I)
The operation timing of Φa9 is as shown in FIG.
A push-push mechanism 07 in which an engager (I9) attached to e so as to be swingable is elastically engaged with a guide groove ■ formed in a guide plate α on the push lever (11a) by means of a spring ■.
), and the guide groove (2) extends from point a at the front end corresponding to starting end position A to end position B as shown in FIG.
The first groove portion (22a
), a second groove C22b) extending diagonally forward from point b toward point 0 corresponding to intermediate position C, and a small groove connecting point 0 and point d corresponding to the unlocked position diagonally rearward of point b. It is composed of a third groove part C22c) with a long length, and a fourth groove part (22d) that curves forward and extends from point d to point a, and these groove parts (22a) (22b) 022c)C
22d) with steps as shown in FIG. As a result, the engaging element a9 is moved from point a to point b along the first groove part C22a), and when the pressure is released at the end position B, the engaging element a9 is moved to the first position by the step at the end of the first groove part (22a). It is prevented from moving backward toward the groove (22a) and is moved to the 0 point along the second groove (e2b), and the push rod (11a)
) is stopped by the return spring (11b) from the terminal position B by the movement of the engager ('19) to the zero point,
The pushing rod (11a) is locked at the intermediate position C, and then when the pushing rod (11a) is pressed from the intermediate position C, the locking is caused by the step at the end of the second groove C22b). The interlock ('l!I) is prevented from moving backward into the second groove (22b) and is moved to point d via the third groove (22c), and the push rod is moved to the corresponding unlocked position. (lla) is regulated, and when the pressure is released at this position, the element (+91 is the third groove part C22c) is prevented from moving backward into the third groove part 122c) due to the step between it and the third groove part C22c. is moved to point a along the fourth groove C22d), and the push lever (11
a) is returned to the starting position A.

The exact operation timing is, for example, as shown in FIG. The on-off valve (4) begins to open at point d, which is approximately 2.8 mm from the point d, and discharge to the solenoid (5a) begins by switching the changeover switch 0 at point a, which is approximately 2.8 mm, and the valve crosses the intermediate position C. The electromagnetic safety valve (5) begins to be pressed open at point b, which is about 6 mm, and the igniter (9) starts to operate by opening the ignition valve (10) and opening the ignition switch 11Φ at two points, about 8.3 + nm. The stroke when the pushing rod (11a) is returned to the starting position by the pushing operation from the intermediate position C is, for example, such that the electromagnetic safety valve kept in the open position is not pushed open. 7th
As shown in the figure, the distance was about 1 mm from the intermediate position C.

In addition, in the above embodiment, since it is applied to a gas appliance having an electromagnetic safety valve 5) as a spark safety device, the push lever (1) is used.
The pressing operation to the terminal position B in 1a) not only activates the igniter (9) but also causes the safety valve (5) to be opened by pressing, but the present invention is not limited to this. The present invention is similarly applicable to gas appliances such as gas stoves that do not have a spark safety device that activates the igniter (9) by pressing to directly ignite the burner (2).

(Effects of the Invention) According to the first invention, the electromagnetic safety valve is pressed open when the push lever is pressed from a position beyond the intermediate position to the end position, so that the push lever When the push button is released and the push rod is locked in the intermediate position, the pressure on the electromagnetic safety valve by the push button is released, so in the unlikely event that ignition fails or a misfire occurs, the electromagnetic safety valve may be activated. The electromagnetic safety valve can be reliably closed when attempting to close it,
It is safe because it prevents the release of raw gas, and it is also safe because it prevents the release of raw gas.
According to the invention, the stroke when the push button is returned to the starting position by a push operation from an intermediate position is set to a small stroke that does not exceed the closing position of the electromagnetic safety valve, so that the push button can be returned to the starting position by a push operation again. Even when returning to the starting position, the electromagnetic safety valve does not open and release raw gas, resulting in a safe effect.

[Brief explanation of the drawing]

Figure 1 is a cutaway view of one example of the device of the present invention, Figures 2 and 3 are
The figures are sectional views taken along the ■-■ line and ■-■ line in Figure 1, respectively.
The figure is a plan view of the guide groove on the guide plate that constitutes the push-push mechanism, Figure 5 is an exploded cross-sectional view, Figure 6 is a circuit diagram of the igniter and electromagnetic safety valve, and Figure 7 explains the operation of the push button. FIG. (2)...Burner (3)...Gas supply path (4)
...Opening/closing valve (9)...Igniter (I″D...push button q7)...Push-push mechanism patent Applicant Rinnai Corporation Co., Ltd. Figure 7 8 Co.2

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Claims (1)

[Scope of Claims] 1. Pushing the push lever from the starting position through the intermediate position to the final position, and locking the lever at the intermediate position when moving back from the final position to the starting position; A push-push mechanism is provided to return the operating rod to the starting position by pressing the lever again from the intermediate position, and at the intermediate position of the operating rod, an on-off valve interposed in the gas supply path connected to the burner is opened. In the valve, an electromagnetic safety valve controlled by a flame sensor that detects the presence or absence of a flame is inserted in the gas supply path in series with the opening/closing valve, and the electromagnetic safety valve is placed at an intermediate position of the push rod. 1. A gas control device characterized in that a pressure valve is opened when a pressure operation is performed from a position beyond the limit position to a terminal position. 2. Locking this on the push operation lever from the starting position to the intermediate position to the final position, moving it back from the final position to the starting position at the intermediate position, and re-moving from the intermediate position. A push-push mechanism is provided to return the lever to the starting position by pressing the lever, and an on-off valve interposed in the gas supply path connected to the burner is opened at the intermediate position of the push lever. Then, an electromagnetic safety valve controlled by a flame sensor that detects the presence or absence of a flame is inserted in series with the opening/closing valve in the gas supply path, and the electromagnetic safety valve is moved from a position beyond the intermediate position of the push operation rod to an end position. In a valve that is pressed to open in conjunction with the pressing operation of the electromagnetic safety valve, the stroke when returning the pushing lever to the starting position by the pressing operation from the intermediate position does not exceed the closing position of the electromagnetic safety valve. A gas control device characterized by a small stroke.