JPH0333972B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a push-button operating device for a combustor.

Conventionally, this type of device includes a push button that can be pressed freely against a return spring, and a lock device that operates to lock the return movement of the push button from the push end position to the start end position at an intermediate position. Pushing the push button beyond the intermediate position to the end position activates the igniter to ignite the burner unit; return of the push button to the intermediate position deactivates the igniter and ignites the burner unit. A device that provides steady combustion operation is known, and according to this, the igniter does not have to operate at the time of steady combustion due to locking at the intermediate position, but in this case, the lock device is designed to prevent the push button from moving from the intermediate position even slightly. If the push button is pushed beyond the push button, the push button will generally be locked in an intermediate position during the subsequent return operation, resulting in the following inconveniences.

In other words, the user assumes that the ignition operation is complete when the push button is slightly beyond the intermediate position, and the igniter does not actually operate, so the push button is pressed even though the burner unit is not ignited. In this case, since the push button is beyond the intermediate position, the locking device locks the button at the intermediate position, and when the ignition is operated again, the locking device does not operate. It is necessary to perform a release operation to return the push button to the starting position and then press the button, which is inconvenient as the operation becomes troublesome.

In order to eliminate such inconveniences, the present invention provides a cam mechanism that operates the locking device only when the push button is pushed beyond the intermediate position and beyond the return prevention position in the conventional example described above. The present invention is characterized in that it is further provided with an ignition switch that starts operation of the igniter from before the return prevention position when the push button is pushed beyond the intermediate position.

The present invention will be explained below with reference to the illustrated embodiments.

Referring to FIG. 1, 1 is a burner unit having a main burner 1a and an ignition burner 1b, and 2 is a gas control unit. An electromagnetic safety valve 5 which is held open by the electromotive force of a thermocouple 4, which is a flame detection element interposed in the gas passageway 3 and facing the main burner 1a, and a manual shutoff valve 6 are provided. An ignition valve 7 is provided in the ignition gas 3a connected to the ignition burner 1b branched from the downstream side of the valve, and a push button 8 is provided in front of the gas control unit 2.
The push button 8 opens and closes the valves 5, 6, and 7 through a button rod 8a connected thereto and a valve rod 9 inserted into the gas control unit 2.

To explain this in detail, the push button 8 is provided so that it can be pushed freely from the starting end position A to the rear end position B against the return spring 8b, and further from the ending position B to the starting end position A. A locking device 10, which will be described in detail later, operates to lock the return operation by the return spring 8b at an intermediate position C, and the locking device 10
A fire extinguishing button 11 is provided, the operation of which will be described in detail later.
After the push button 8 is pushed to the end position B, it is locked at the intermediate position C and returned to the start position A by operating the fire extinguishing button 11. According to this, the shutoff valve 6 is first opened at the intermediate position C, and then the electromagnetic safety valve 5 is pressed open and the ignition valve 7 is opened by pushing from the intermediate position C to the terminal position B. At the same time, the igniter 12 facing the ignition burner 1b is connected to the button rod 8.
The main burner 1a is energized by the switching operation of the ignition switch 13 interlocked with the protrusion 8c on the ignition burner 1b, and the main burner 1a is given spark ignition via the ignition burner 1b.
Next, when the push button 8 is released and returned to the intermediate position C, the cutoff valve 6 is kept open, but the igniter 12 is inactivated and the ignition valve 7 is closed. The valve is turned on to extinguish the ignition burner 1b, and the pressure on the electromagnetic safety valve 5 is released to allow steady combustion operation of the main burner 1a.Then, the extinguishing button 11 is operated and the push button 8 is moved to the starting position A. When the thermocouple 4 returns to normal, the shutoff valve 6 is closed and the main burner 1a is extinguished, thereby eliminating the electromotive force from the thermocouple 4 and closing the electromagnetic safety valve 5.

The electromagnetic safety valve 5 is operated until a predetermined electromotive force is generated from the thermocouple 4 after the pressure is released.
The valve is forcibly held in the open state by discharge from the capacitor 14 shown in FIG.
Hold switch 1 which is switched by being pressed by d
5 is provided, and when the hold switch 15 is switched to the a contact side at the intermediate position, a discharge circuit is closed that causes the discharge current from the capacitor 14 to flow through the solenoid 5a of the electromagnetic safety valve 5, and the push button 8 is set at the intermediate position C.
After returning to the state, the electromagnetic safety valve 5 is attracted and held in the open state by the discharge from the capacitor 14 and the electromotive force from the thermocouple 4. By switching the hold switch 15 to the B contact by returning to A, a charging circuit connecting the capacitor 14 to the power source 16 via the solenoid 5a is closed, and the solenoid 5a is connected to the thermocouple 4 with a polarity opposite to that of the thermocouple 4. By applying a charging current to the push button 8, the electromagnetic safety valve 5 is immediately closed without waiting for the thermocouple 4 to cool down when the push button 8 returns to the starting position. Further, in the illustrated one, the ignition switch 13 disables the igniter 12 by switching from the a contact to the b contact by returning the push button 8 to the intermediate position C, and also disables the auxiliary discharge circuit of the capacitor 14. The compulsory hold time of the electromagnetic safety valve 5 can be appropriately set by a resistor 17 inserted in the sub-discharge circuit.

The lock device 10 is such that the push button 8 is in an intermediate position C.
The locking device 10 is provided with a cam mechanism 18 that operates the locking device 10 only when the locking device 10 is pushed beyond the reverse prevention position D. As shown in FIG. 2, a cam plate 20 with a cam groove 19 forming the cam mechanism 18 is attached to the button rod 8a, and the machine frame 2 is attached to the button rod 8a.
The cam groove 19 is inserted into the cam groove 19 by a spring 22, and the engaging element 21 is attached to the cam groove 19 so as to be swingable. Stepped first to third grooves 19a, 19b, 19 connecting points A, B, and C corresponding to the starting end, ending end, and intermediate positions A, B, and C of the push button 8;
When the push button 8 is pushed from the starting end position A to the ending position B, the engaging member 21 moves from point A to the When the push button 8 is moved to point B via the first groove part 19a and then returned from the terminal position B by the return spring 8b, the engagement element 21 moves to the step at the terminal end of the first groove part 19a, which is the return prevention position. 19d prevents the push button 8 from moving backward toward the first groove 19a, and moves through the second groove 19b to point C, where it is engaged with the step 19e at the starting end of the third groove 19c, and the push button 8 is pressed. It was designed to be locked at intermediate position C.

Here, when the push button 8 is pressed from the starting end position A, the push button 8 is moved by the engager 21 into the first groove portion 1.
If the engaging element 21 is not pushed to a position beyond the step 19d at the end of the push button 9a, that is, to the return prevention position D, during the return operation, the engaging element 21 will move backward through the first groove part 19a and return to point A, leaving the push button 8 at the intermediate position C. In other words, the locking device 10 is only actuated when pushed beyond the anti-return position D.

As shown in FIGS. 1 and 2, the fire extinguishing button 11 is arranged side by side with the push button 8, and when pressed, the lock release lever engaged with the engaging element 21 is released. 24 is a button rod 11a connected to the fire extinguishing button 11
The upper protrusion 11b slides the engaging element 21 through the pin 24a against the spring 24b in the direction of pulling it up from the cam groove 19, and the engaging element 21 overcomes the step 19e and moves to the third groove part 19c. Then, the locking of the push button 8 at the intermediate position C, that is, the operation of the lock device 10 is released, and the push button 8 is returned to the starting position A.

Furthermore, the present invention is provided with an ignition switch 13 that operates the igniter 12 from before the reverse prevention position D when the push button 8 is pushed beyond the intermediate position C. Rod 8
The igniter 1 is switched to the A contact side by crossing the intermediate position C by the protrusion 8c on the A and before reaching the reverse prevention position D.
I decided to activate 2.

In this case, the electromagnetic safety valve 5 is connected to the igniter 1.
When the electromagnetic safety valve 5 starts to open, the igniter 12 is always in the operating state to prevent raw gas from being released. so that

Next, to explain the operation, the push button 8 is in the intermediate position C.
However, according to the present invention, it is possible to prevent the igniter 12 from returning beyond the intermediate position C, thinking that the ignition operation has been completed at a position slightly beyond the intermediate position C. Since the activation starts before position D, the ignition switch 13 must be closed and the igniter 12 activated when the push button 8 is pressed before it is locked in the intermediate position C. When the push button 8 is released before the ignition switch 13 is activated, the lock device 10
does not operate, the push button 8 returns to the starting position A without being locked at the intermediate position C, and when the user attempts to relight the flame after realizing that the flame is not lit, the locking device 10 is activated as in the conventional case. There is no need to release the push button 8 and return it to the starting position A, making the re-ignition operation easier.

In the above embodiment, the locking device 10 is connected to the cam groove 1.
In the above embodiment, the fire extinguishing button 11 is used to release the locking device 10 and the push button 8 is moved to the starting position. Although the push button 8 is returned to the starting position A, it is also possible to return the push button 8 to the starting position A by pressing the push button 8 twice using a locking device 10 that applies a conventionally known heart cam type push mechanism. To explain this in detail, the locking operation 10 is composed of a cam plate 20 and an engaging element 21 in the same manner as described above, and the cam groove 19' formed in the cam plate 20 is
As shown in the figure, it has a modified heart cam shape, and a step is added as shown in the seventh figure.

Here, when the push button 8 is operated from the starting end position A → the end position B → the intermediate position C, the engager 21 moves as described above from the point A → the first groove part 19'a → the point B → the second groove part 19'b → When the engager 21 is moved to point C and then pressed again from intermediate position C, the engager 21 moves from point C to
The push button 8 is returned to the starting position A by returning to the point A along the path from point 2 to the third groove 19'c. In order to prevent unnecessary operation, the igniter 12 is moved between the return prevention position D corresponding to the step 19'd at the end of the first groove part 19'a and the pushed-in position E from the intermediate position C corresponding to point 2. start the operation.

As described above, according to the present invention, the locking device is actuated to lock the push button at the intermediate position only when the push button is pushed past the intermediate position and beyond the reverse prevention position by the cam mechanism. The ignition switch is used to start the igniter before the reverse prevention position, and when the push button is pressed, the ignition switch is closed and the igniter is not activated until the igniter returns to the intermediate position C. Therefore, if you make a mistake such as releasing the push button at a position slightly beyond the intermediate position, the push button will not be locked at the intermediate position and will return to the starting position and be pressed again. This has the effect of making the ignition operation easier.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of an example of the device of the present invention;
Fig. 2 is a perspective view of the main parts, Fig. 3 is a front view of the cam plate constituting the locking device, Fig. 4 is a developed cross-sectional view along the cam groove of the cam plate, and Fig. 5 is the electrical The circuit diagram, FIG. 6 is a front view of a modified example of the cam plate, and FIG. 7 is a developed cross-sectional view along the cam groove of the cam plate. 1...burner unit, 8...push button, 8b...
Return spring, 10...Lock device, 12...Igniter, 18...Cam mechanism, A...Starting end position, B...
End position, C...Intermediate position, D...Return prevention position.

Claims (1)

[Claims] 1. A push button that can be pressed against a return spring is provided, and a locking device that operates to lock the return operation of the push button from the push end position to the start end position at an intermediate position is provided. Pushing the push button beyond the end position activates the igniter to ignite the burner unit, and returning the push button to the intermediate position deactivates the igniter to provide steady combustion operation of the burner unit. In the push-button operation device for a combustor, the lock device incorporates a cam mechanism that operates the lock device only when the push button is pushed beyond an intermediate position and beyond a return prevention position,
A push button operating device for a combustor, further comprising an ignition switch that starts operation of the igniter from before the return prevention position when the push button is pushed past an intermediate position.