JP3685513B2 - Combustion equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a combustion apparatus that opens and closes a first valve and a second valve by rotation of an electric motor.
[0002]
[Prior art]
For example, in a gas tracking device that performs bath bathing by gas combustion, a gas supply path includes a first passage that supplies gas to the first burner and a second passage that supplies gas to the second burner. Some are equipped in parallel. In this gas purging device, an electromagnetic valve is provided as a safety valve upstream of the gas supply passage, and a first valve and a second valve are provided in each of the first passage and the second passage on the downstream side, and the first passage and The second passage is opened and closed.
[0003]
[Problems to be solved by the invention]
In a combustion apparatus such as a gas purging apparatus, there is a type that opens and closes a first valve and a second valve using one electric motor. Specifically, the rotational torque of the electric motor is amplified using a plurality of gears, the cam is rotationally driven by the rotational force with the increased torque, and the push rod is pressed by the displacement of the cam to operate the first valve and the second valve. The valve is opened and closed.
[0004]
Thus, when the opening and closing control of the first valve and the second valve is performed using the electric motor, the first switch for detecting the rotation of the cam and detecting the opening / closing state of the first valve, and the rotation of the cam are detected. And providing a second switch for detecting the open / closed state of the second valve.
However, by providing the first switch and the second switch, a potential failure probability of the first switch and the second switch occurs. For this reason, even if one of the first switch or the second switch fails, a function that can reliably close the first valve and the second valve is desired.
[0005]
OBJECT OF THE INVENTION
The present invention has been made in view of the above circumstances, and its purpose is to reliably close the first valve and the second valve even if one of the first switch or the second switch fails. It is to provide a combustion device with high safety.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the combustion apparatus of the present invention employs the following technical means.
[Means of Claim 1]
Combustion device
(A) a first burner for burning fuel;
(B) a second burner for burning fuel;
(C) a first passage for supplying fuel to the first burner;
(D) a second passage for supplying fuel to the second burner;
(E) a first valve that opens and closes the first passage in response to rotation of a cam driven in one direction by an electric motor;
(F) a second valve that opens and closes the second passage in response to rotation of the cam;
(G) a first switch that detects rotation of the cam and performs an on / off operation once while the first valve and the second valve perform an opening / closing operation;
(H) a second switch that detects rotation of the cam and performs an on / off operation once while the first valve and the second valve perform an opening / closing operation;
(I) a control circuit that controls energization of the electric motor based on the signal of the first switch and the signal of the second switch.
[0007]
(G-1) The first switch is provided so that a signal change occurs when the first valve is open, and a signal change occurs when both the first valve and the second valve are closed. It is done.
(H-1) The second switch is provided such that a signal change occurs when the second valve is open, and a signal change occurs when both the first valve and the second valve are closed. It is done.
(I-1) The control circuit
When controlling the electric motor to rotationally drive the cam,
When the ON / OFF transition state of the first switch and the second switch is not a normal transition state set in advance , the signal of the first switch does not change, and the signal change of only the second switch, Determining that the first switch has failed, and setting both the first valve and the second valve to a closed state based on a signal change when the second switch is closed;
When the ON / OFF transition state of the first switch and the second switch is not a normal transition state set in advance, the signal of the second switch does not change, and the signal change of only the first switch, Switch failure response means for determining that the second switch has failed and setting both the first valve and the second valve to a closed state based on a signal change when the first switch is closed. Is provided.
[0008]
[Means of claim 2]
The combustion apparatus according to claim 1, wherein
The electric motor and the control circuit are operated by electric power of a dry battery.
[0009]
[Means of claim 3]
The combustion apparatus according to claim 2, wherein
The control circuit is equipped with a microcomputer.
The switch failure handling means sets both the first valve and the second valve to a closed state when the ON / OFF transition state of the first switch and the second switch is not a preset transition state. After that, the microcomputer is turned off.
[0010]
[Means of claim 4]
The combustion apparatus according to any one of claims 1 to 3,
The first burner and the second burner heat a remedy heat exchanger that performs bath remedy.
[0011]
[Operation and effect of the invention]
[Operation and effect of claim 1]
When the first switch fails and the signal change of the first switch does not occur, the switch failure countermeasure means of the control circuit uses the first valve and the second valve based on the signal change when the valve is closed by the second switch. Are set to the closed state.
On the other hand, when the second switch fails and the signal change of the second switch does not occur, the switch failure countermeasure means of the control circuit is connected to the first valve based on the signal change when the valve is closed by the first switch. Both the second valves are set to the closed state.
[0012]
As described above, the combustion apparatus is provided with the first switch for detecting the opening / closing state of the first valve and the second switch for detecting the opening / closing state of the second valve, and controls the opening and closing of the first valve and the second valve. However, even if one of the first switch or the second switch breaks down, the first valve and the second valve can be reliably closed, and high safety can be ensured.
[0013]
[Operation and effect of claim 2]
By adopting claim 2 and using a dry cell as the power source, the circuit for transforming and rectifying the AC 100V power source can be eliminated, and the price of the combustion device that drives the first valve and the second valve by the electric motor can be kept low. be able to.
[0014]
[Operation and effect of claim 3]
By adopting the third aspect, after one of the first switch and the second switch fails and both the first valve and the second valve are set to the closed state, the switch failure countermeasure means causes the microcomputer to The power is turned off. For this reason, the power consumption of the unnecessary dry battery is suppressed, and the remaining power of the dry battery can be used effectively.
[0015]
[Operation and effect of claim 4]
By adopting the fourth aspect, it is possible to ensure high safety of the memory device that drives the first valve and the second valve by the electric motor.
[0016]
【Example】
Next, the combustion apparatus of the present invention will be described with reference to the drawings based on an embodiment applied to a bath gas purging apparatus.
[Configuration of Example]
1 to 5 show an embodiment, and FIG. 1 is a schematic configuration diagram of a gas purging device.
The gas tracking device 10 is roughly divided into a combustor 11 that burns gas (fuel) and heats water or hot water in a bathtub (not shown), and gas supply means 12 that supplies gas to the combustor 11. , And a control circuit 13 for operating the gas purging device 10 will be described in the following order.
[0017]
(Description of combustor 11)
The combustor 11 includes a sub-burner 14 (corresponding to the first burner), a plurality of second burners 15 (corresponding to the second burner), a heat exchanger 16 for reheating, and an exhaust pipe 17.
The sub-burner 14 and the plurality of main burners 15 are juxtaposed, and are a Bunsen burner in which the gas supplied from the gas supply means 12 is blown out from a number of injection holes and gas is combusted by ambient air. The sub burner 14 is provided with a slightly smaller combustion amount than the combustion amount of the main burner.
The sub-burner 14 is a burner that ignites before the main burner 15. In the vicinity of the sub-burner 14, an ignition plug 18 that ignites the sub-burner 14 and a thermocouple 19 that detects the ignition state of the sub-burner 14 are provided. It has been.
[0018]
The memorial heat exchanger 16 is a means for heating the water (hot water) in the bathtub by exchanging heat between the gas combustion by the sub-burner 14 and the main burner 15 and the water (hot water) in the bathtub. It is comprised from the piping 21 connected to the bathtub, and the water (hot water) in a bathtub is guide | induced, and the fin 22 which improves heat exchange efficiency.
Note that an empty cooking detection sensor 23 that detects empty cooking is attached to the pipe 21 of the memorial heat exchanger 16. This empty cooking detection sensor 23 is a bimetal switch that operates according to the temperature of the pipe 21, and when the temperature of the pipe 21 reaches a predetermined value or more, it is turned ON or OFF to detect empty cooking.
[0019]
The exhaust cylinder 17 is a cylinder that collects the exhaust gas that has passed through the heat exchanger 16 for exhaustion and discharges it to the outside. A baffle 24 for preventing deterioration of combustion due to the back wind is attached to the end on the exhaust side. ing.
A first exhaust thermistor 25 is attached to the inner side of the baffle 24, and a second exhaust thermistor 26 is attached to the lower side of the baffle 24, and the wind is detected depending on the detected temperatures of the first and second exhaust thermistors 25, 26. It is provided to detect the influence of
[0020]
(Description of gas supply means 12)
The gas supply means 12 includes a gas supply path 31, an electromagnetic valve 32, a pilot valve 33 (corresponding to a first valve), a main valve 34 (corresponding to a second valve), and a governor valve 35.
The gas supply path 31 includes a hose end 36 to which a gas hose or a gas pipe (not shown) that receives gas supply is connected at one end. The gas supplied from the hose end 36 is supplied to the pilot valve 33 and the main valve 34 via the electromagnetic valve 32. The gas supply path 31 passes through the pilot valve 33 and supplies a gas to the sub-burner 14. The gas passage 31 passes through the pilot passage 37 (corresponding to the first passage) and the main valve 34 to the main burner 15. It is provided so as to branch into a main passage 38 (corresponding to a second passage) having a large flow path diameter for supplying gas. The governor valve 35 keeps the pressure of the gas flowing through the main passage 38 constant.
[0021]
The electromagnetic valve 32 is a safety valve provided on the upstream side of the gas supply path 31. The electromagnetic valve 32 is of a normally closed type, and as shown in FIG. 2, includes a valve body 42 that closes the gas supply path 31 by a spring 41 and an electromagnetic coil 43 that opens the valve body 42. . The electromagnetic coil 43 is energized only at the start of operation to generate a large electromagnetic force, and a suction coil 43a that opens the valve body 42 by attracting the magnetic armature 42a provided on the valve body 42 to the iron core 43c. And a holding coil 43b that keeps the armature 42a magnetized in the iron core 43c and keeps the valve element 42 in an open state while being always energized during operation.
[0022]
As shown in FIG. 2, the pilot valve 33 includes a valve body 45 that closes the pilot passage 37 by a spring 44 and a pilot valve opening mechanism 46 that opens the valve body 45.
[0023]
The pilot valve opening mechanism 46 includes a geared motor 47, a cam 48, and a push rod 49.
The geared motor 47 rotates the shaft 53 by a gear train 52 using a plurality of gears, and the rotational force generated by the electric motor 51 is rotationally driven. The gear train 52 suppresses the rotational speed generated by the electric motor 51 and reduces the generated torque. It is provided to increase. The shaft 53 including the cam 48 is provided so as to rotate 360 ° by the geared motor 47.
[0024]
The cam 48 is provided so as to rotate integrally with the shaft 53, and changes the displacement position of the push rod 49 according to the rotational position of the shaft 53.
The push rod 49 is for directly changing the valve body 45 of the pilot valve 33, and is provided so that the valve body 45 opens the pilot passage 37 when the push rod 49 is moved downward in FIG. 2 by the cam 48. It has been.
When the cam 48 is rotated 360 ° by the geared motor 47, the push rod 49 changes as shown by the solid line A in FIG.
[0025]
On the other hand, as shown in FIG. 2, the main valve 34 includes a valve body 55 that closes the main passage 38 by a spring 54, and a main valve opening mechanism 56 that opens the valve body 55 according to the transition position of the push rod 49. Composed.
The main valve opening mechanism 56 includes a pressing rod 57 attached to the push rod 49 and a pressure receiving cylinder 58 attached to the valve body 55. The pressure receiving cylinder 58 is slidably fitted around a fixed cylinder 59 fixed in the gas supply path 31, and includes an annular rib 58 a that is pressed around by a pressing rod 57. The annular rib 58a is provided so as to contact the pressing rod 57 after the pressing rod 57 has shifted a predetermined amount downward in FIG.
[0026]
For this reason, when the pressing amount of the push rod 49 is small (for example, the rotation angle of the cam 48 is about 100 °), the pilot valve 33 → open and the main valve 34 → close, but the pressing amount of the push rod 49 increases. Then (for example, the rotation angle of the cam 48 is about 260 °), the pilot valve 33 is opened and the main valve 34 is opened (see solid lines B and C in FIG. 3). When the rotation angle of the cam 48 becomes a predetermined angle or more (for example, 295 ° or more), the pressing force of the push rod 49 by the cam 48 is released, and the action of the springs 44 and 54 causes the pilot valve 33 to be closed and the main valve 34 to be closed. Closed.
[0027]
On the other hand, the geared motor 47 is provided with detection means for detecting the rotational position of the cam 48, that is, the open states of the pilot valve 33 and the main valve 34. The detection means includes a pilot switch Psw (corresponding to a first switch), a main switch Msw (corresponding to a second switch), and a pilot switch Psw and a main switch Msw corresponding to the rotational position of the shaft 53. The rotation detection cam 60 is turned on and off.
[0028]
The pilot switch Psw and the main switch Msw are turned on and off (Hi-) as indicated by solid lines D and E in FIG. 3 according to the rotational position of the cam 48 and the open state of the pilot valve 33 and the main valve 34. Low) Changes.
Specifically, first, when both the pilot valve 33 and the main valve 34 are closed, only the main switch Msw is Hi (corresponding to a signal change when both the pilot valve 33 and the main valve 34 are closed). Become.
When the pilot valve 33 is reliably opened and the main valve 34 is closed, the pilot switch Psw is also Hi (corresponding to a signal change when the pilot valve 33 is open).
Next, with the pilot valve 33 and the main valve 34 being reliably opened, only the main switch Msw is changed to Low (corresponding to a signal change when the main valve 34 is in the open state).
Further, the rotation of the cam 48 advances, and the pilot valve 33 and the main valve 34 are securely closed, and the pilot switch Psw is also low (corresponding to a signal change when both the pilot valve 33 and the main valve 34 are closed). Change.
[0029]
(Description of control circuit 13)
As shown in the block diagram of FIG. 4, the control circuit 13 is provided with electric functional parts (the ignition plug 18, the suction coil 43 a and the holding coil 43 b of the electromagnetic coil 43, the electric motor 51, and the combustion described later) The confirmation lamp 66 and the battery confirmation lamp 67) are electric circuits using a microcomputer 61 that controls energization according to an input signal and a control program, and are operated by the electric power of the dry battery 62.
[0030]
The control circuit 13 receives, as input signals, a remote controller 63 (hereinafter referred to as “thermocouple 19”, empty cooking detection sensor 23, first exhaust thermistor 25, second exhaust thermistor 26, pilot switch Psw, main switch Msw). Signals from the operation switch 64 and the timer volume 65 provided in the remote controller are input.
[0031]
The operation switch 64 is a tact switch that gives an instruction to start or stop the gas purging device 10.
The timer volume 65 is a variable resistor for setting the tracking time, and the control circuit 13 determines the number of bits according to the resistance value and changes the count time for one time according to the number of bits. . The control circuit 13 counts a predetermined number of times (for example, 255 times) regardless of the number of bits, and sets the timer time by changing the count time once.
[0032]
The remote control 63 is installed in the bathroom and operated by the user. In addition to the operation switch 64 and the timer volume 65, the remote control 63 is connected to the combustion confirmation lamp 66 for confirming the combustion state and the voltage of the dry battery 62. A battery confirmation lamp 67 for confirmation is provided.
[0033]
The dry battery 62 is a power source using, for example, two single dry batteries. In addition to the operation of the control circuit 13, the operation of the ignition plug 18, the operation of the electromagnetic coil 43, the operation of the electric motor 51, the combustion confirmation lamp 66 and the battery confirmation It is also used during the operation of the lamp 67.
[0034]
(Explanation of operation of gas purging device 10 by basic operation of control circuit 13)
Here, the basic operation of the control circuit 13 will be described based on the flowchart of FIG.
When the operation switch 64 is turned on, the power is turned on (start), and then it is determined whether or not the memory time is set by the timer volume 65 (step S1). If the determination result is NO, it is determined whether a predetermined time (for example, 5 seconds) has elapsed after the operation switch 64 is turned on (step S2). If the determination result is NO, the process returns to step S1, and if the determination result is YES (if the timer is not set for a predetermined time even when the operation switch 64 is turned on), the operation switch 64 is turned on due to a malfunction. If so, the microcomputer 61 is turned off and the process is terminated (step S3).
[0035]
If the decision result in the step S1 is YES, the spark plug 18 is turned on (step S4). Subsequently, the electric motor 51 is turned on to open only the pilot valve 33 (step S5). Next, it is determined whether the pilot valve 33 has been opened, that is, whether the pilot switch Psw has changed to Hi (step S6). If the determination result is NO, the process returns to step S6, and the electric motor 51 is turned on until the pilot switch Psw changes to Hi. If the decision result in the step S6 is YES, it is judged that the pilot valve 33 is opened, and the electric motor 51 is turned off (step S7). Next, the electromagnetic coil 43 is turned on (specifically, both the suction coil 43a and the holding coil 43b are turned on initially, and then only the suction coil 43a is turned off, step S8).
[0036]
Next, it is determined whether ignition is detected in the sub-burner 14, that is, whether the electromotive force of the thermocouple 19 provided in the vicinity of the sub-burner 14 exceeds a predetermined value (step S9). If this determination result is NO, it is determined whether or not a predetermined time (for example, 25 seconds) has elapsed after the electromagnetic coil 43 is turned on (step S10). If the determination result is NO, it is determined that the predetermined time has not elapsed, and the process returns to step S9. If the determination result in step S9 is YES, it is determined that ignition has been confirmed, and the spark plug 18 is turned off (step S11).
[0037]
Subsequently, the electric motor 51 is turned on to open the main valve 34 (step S12). Next, it is determined whether or not the main valve 34 has been opened, that is, whether or not the main switch Msw has changed to Low (step S13). If the determination result is NO, the process returns to step S13, and the electric motor 51 is turned on until the main switch Msw changes to Low. If the determination result in step S13 is YES, it is determined that the main valve 34 is also opened, and the electric motor 51 is turned off (step S14). The operation of the steps S13 and S14 starts the combustion of gas in the main burner 15, and the combustion of the sub-burner 14 and the main burner 15 causes the bath of the bathtub introduced into the piping 21 of the heat exchanger 16 for remedy. Heat water (hot water).
[0038]
Next, after the ignition is detected, it is determined whether or not the chasing time set by the timer volume 65 has elapsed (step S15). If the determination result is NO, it is determined that the memorial time has not elapsed and the process returns to step S15. If the result of this determination is YES, it is determined that the memorial time has elapsed and the fire extinguishing operation is started. That is, first, the electromagnetic coil 43 is turned off (specifically, the suction coil 43a is already turned off and the holding coil 43b is turned off, step S16).
[0039]
Next, it is determined whether fire extinguishing has been detected, that is, whether the electromotive force of the thermocouple 19 has decreased below a predetermined value (step S17). If the determination result is NO, it is determined whether or not a predetermined time (for example, 120 seconds) has elapsed after turning off the electromagnetic coil 43 (step S18). If the determination result is NO, it is determined that fire extinguishing has not been confirmed, and the process returns to step S17. If the determination result in step S17 is YES, it is determined that fire extinguishing has been confirmed, and the electric motor 51 is turned on to close the pilot valve 33 and the main valve 34 (step S19).
[0040]
Next, it is determined whether the pilot valve 33 and the main valve 34 are closed, that is, whether the pilot switch Psw has changed to Low (step S20). If the determination result is NO, the process returns to step S20, and the electric motor 51 is turned on until the pilot switch Psw changes to Low. If the determination result in step S20 is YES, it is determined that the pilot valve 33 and the main valve 34 are closed, and the electric motor 51 is turned off (step S21). As described above, since all the chasing operations are completed and returned to the state before the operation is started, the power of the microcomputer 61 is turned off and the process is terminated (step S22).
[0041]
On the other hand, if the determination result in step S10 is YES, that is, if ignition is not detected within 25 seconds after the start of ignition, it is determined that an ignition error has occurred, the ignition operation is terminated, and the gas tracking device 10 is activated. Perform the operation to return before starting. That is, the electromagnetic coil 43 is turned off (as described above, the suction coil 43a is already turned off and the holding coil 43b is turned off, step S23), and the spark plug 18 is turned off (step S24). Subsequently, the electric motor 51 is turned on to close the pilot valve 33 and the main valve 34 (step S25). Thereafter, it is determined whether the pilot valve 33 and the main valve 34 are closed, that is, whether the pilot switch Psw has changed to Low (step S26). If the determination result is NO, the process returns to step S26, and the electric motor 51 is turned on until the pilot switch Psw changes to Low. If the determination result in step S26 is YES, it is determined that the pilot valve 33 and the main valve 34 are closed, and the electric motor 51 is turned off (step S27). Since the state before the start of the operation has been returned as described above, the power of the microcomputer 61 is turned off and the process ends (step S28).
[0042]
If the judgment result in step S18 is YES, that is, if fire extinguishing is not detected within 120 seconds after the electromagnetic coil 43 is turned off, it is judged that the electromagnetic coil 43 has failed and cannot be extinguished. Fire extinguishing is performed with 33 and the main valve 34 to display an abnormality. That is, first, the electric motor 51 is turned on to close the pilot valve 33 and the main valve 34 (step S29). Next, it is determined whether or not the pilot valve 33 and the main valve 34 are closed, that is, whether or not the pilot switch Psw has changed to Low (step S30). If the determination result is NO, the process returns to step S30, and the electric motor 51 is turned on until the pilot switch Psw changes to Low. If the determination result in step S30 is YES, it is determined that the pilot valve 33 and the main valve 34 are closed, and the electric motor 51 is turned off (step S31). Then, the fact that a problem has occurred in the solenoid valve 32 (error display) is displayed to the user using the combustion confirmation lamp 66 and the battery confirmation lamp 67 provided on the remote control 63 (for example, the combustion confirmation lamp 66 and the battery confirmation). Both lamps 67 are turned on for 1 second and turned off for 1 second to indicate that a problem has occurred in the solenoid valve 32 (step S32).
[0043]
When the operation switch 64 is turned ON again after the operation is started and before the operation is completed, that is, when an instruction to stop the operation is given, if both the pilot switch Psw and the main switch Msw are low, the power is turned on as it is. If the pilot switch Psw and the main switch Msw are not low, the process proceeds to step S23, the fire extinguishing operation is performed, the state before the operation is started, the microcomputer 61 is turned off, and the microcomputer 61 is turned off. It is provided to finish.
[0044]
(Description of means for responding to failure of pilot switch Psw or main switch Msw)
When the operation is started, the control circuit 13 controls energization of the electric motor 51 based on the signals from the pilot switch Psw and the main switch Msw as described in the above flowchart, and controls the pilot valve 33 and the main valve 34. Open / close control.
[0045]
Here, the transition state of the pilot switch Psw / main switch Msw during normal operation is as follows: operation start (Low / Low) → (Low / Hi) → pilot valve 33 open (Hi / Hi) → main valve 34 open (Hi / Low) ) → Pilot valve 33 and main valve 34 are closed (Low / Low). In other words, when normal, the transition is (Low / Low) → (Low / Hi) → (Hi / Hi) → (Hi / Low) → (Low / Low).
[0046]
However, there is a possibility that one of the pilot switch Psw or the main switch Msw fails and does not transition as described above. Therefore, the control circuit 13 is provided with a switch failure countermeasure means 71 in order to cope with a failure of one of the pilot switch Psw or the main switch Msw.
[0047]
This switch failure handling means 71 is in the state where the transition state of the pilot switch Psw and the main switch Msw is not a normal transition state during the operation of the gas purging device 10, and the signal of the pilot switch Psw does not change, only the main switch Msw. Is determined that the pilot switch Psw has failed, and both the pilot valve 33 and the main valve 34 are closed based on the signal change (Low → Hi) when the main switch Msw is in the closed state. Set to state. After the valve closing is set, the microcomputer 61 is turned off and the process ends.
[0048]
That is, for example, when the pilot switch Psw fails, the valve closing position of the pilot valve 33 cannot be detected, but the main switch Msw changes before the pilot switch Psw changes at the valve opening position of the main valve 34. A failure of the pilot switch Psw can be detected. In this case, the main valve 34 is in the open state, but since the electromagnetic coil 43 is not turned on, the raw gas is not released.
[0049]
Further, the switch failure handling means 71 is in a state where the transition state of the pilot switch Psw and the main switch Msw is not a normal transition state during the operation of the gas purifying device 10, the signal of the main switch Msw does not change, and the pilot switch Psw In the case of only the signal change, it is determined that the main switch Msw has failed, and both the pilot valve 33 and the main valve 34 are closed based on the signal change (Hi → Low) when the pilot switch Psw is closed. Set to valve status. After the valve closing is set, the microcomputer 61 is turned off and the process ends.
[0050]
That is, for example, when the main switch Msw fails, the pilot switch Psw changes before the main switch Msw changes at the open position of the pilot valve 33, so that the failure of the main switch Msw can be detected. Also in this case, since the electromagnetic coil 43 is not turned on, the raw gas is not released.
[0051]
When the switch failure handling means 71 determines that the pilot switch Psw has failed, the switch 51 responds by energizing the electric motor 51 until the signal of the main switch Msw changes from Low to Hi. Steps S21 and S22 are executed and the process ends. Conversely, when it is determined that the main switch Msw has failed, the electric motor 51 is energized until the signal of the pilot switch Psw changes from Hi to Low, and then changes to Low. When this is detected, steps S21 and S22 of the flowchart described above are executed and the process ends.
[0052]
[Effects of Examples]
As described above, in the gas purging device 10 of this embodiment, when the pilot switch Psw fails, the switch failure handling means 71 is connected to the pilot valve 33 based on the signal change from Low to Hi by the main switch Msw. When both the main valves 34 are set to the closed state and the main switch Msw fails, the switch failure response means 71 is connected to the pilot valve 33 based on the signal change from Hi to Low by the pilot switch Psw. Both the main valves 34 are set to a closed state.
[0053]
In this way, even in the gas purging device 10 that is provided with the pilot switch Psw and the main switch Msw and controls the opening and closing of the pilot valve 33 and the main valve 34, one of the pilot switch Psw or the main switch Msw should be out of order. Even so, the pilot valve 33 and the main valve 34 can be reliably closed. Therefore, it is possible to provide a highly safe gas tracking device 10.
[0054]
In addition, since the dry battery 62 is used as the power source, a circuit for transforming and rectifying the AC 100V power source as in the past can be eliminated, and the gas purging device that drives the pilot valve 33 and the main valve 34 by the electric motor 51. The price of 10 can be kept low.
[0055]
After one of the pilot switch Psw and the main switch Msw is broken and both the pilot valve 33 and the main valve 34 are set to the closed state, the microcomputer 61 is turned off by the switch failure handling means 71. The power consumption of the unnecessary dry battery 62 is suppressed, and the remaining power of the dry battery can be used effectively.
[0056]
[Modification]
In the above embodiment, the present invention is applied to the gas purging device. However, the present invention is all applied to other combustion devices having a valve by an electric motor, such as a combusting device that performs a chasing operation with liquid fuel such as kerosene. It is possible.
Moreover, although the example which used the dry cell for the power supply was shown, you may use the AC100V power supply supplied to each household by transforming and rectifying.
Furthermore, the numerical values shown in the above-described embodiments are examples for explaining the embodiments and can be changed as appropriate.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a gas purging device (Example).
FIG. 2 is a cross-sectional view showing the main part of the gas supply means (Example).
FIG. 3 is a chart showing the cam rotation angle and the operation of each part (Example).
FIG. 4 is a block diagram illustrating a connection state of a control circuit (embodiment).
FIG. 5 is a flowchart showing a basic operation of the control circuit (Example).
[Explanation of symbols]
10 Gas memory device (combustion device)
11 Combustor 12 Gas supply means 13 Control circuit 14 Sub burner (first burner)
15 Main burner (second burner)
16 Heat exchanger for remedy 31 Gas supply passage 32 Solenoid valve 33 Pilot valve 34 Main valve 37 Pilot passage (first passage)
38 Main passage (second passage)
48 cam 51 electric motor 61 microcomputer 62 dry battery 71 switch failure countermeasure means Psw pilot switch (first switch)
Msw main switch (second switch)

Claims (4)

(A) a first burner for burning fuel;
(B) a second burner for burning fuel;
(C) a first passage for supplying fuel to the first burner;
(D) a second passage for supplying fuel to the second burner;
(E) a first valve that opens and closes the first passage in response to rotation of a cam driven in one direction by an electric motor;
(F) a second valve that opens and closes the second passage in response to rotation of the cam;
(G) a first switch that detects rotation of the cam and performs an on / off operation once while the first valve and the second valve perform an opening / closing operation;
(H) a second switch that detects rotation of the cam and performs an on / off operation once while the first valve and the second valve perform an opening / closing operation;
(I) a control circuit that controls energization of the electric motor based on the signal of the first switch and the signal of the second switch;
(G-1) The first switch is provided so that a signal change occurs when the first valve is open, and a signal change occurs when both the first valve and the second valve are closed. And
(H-1) The second switch is provided such that a signal change occurs when the second valve is open, and a signal change occurs when both the first valve and the second valve are closed. And
(I-1) The control circuit
When controlling the electric motor to rotationally drive the cam,
When the ON / OFF transition state of the first switch and the second switch is not a normal transition state set in advance , the signal of the first switch does not change, and the signal change of only the second switch, Determining that the first switch has failed, and setting both the first valve and the second valve to a closed state based on a signal change when the second switch is closed;
When the ON / OFF transition state of the first switch and the second switch is not a normal transition state set in advance, the signal of the second switch does not change, and the signal change of only the first switch, Switch failure response means for determining that the second switch has failed and setting both the first valve and the second valve to a closed state based on a signal change when the first switch is closed. A combustion apparatus comprising: The combustion apparatus according to claim 1, wherein
The combustion apparatus, wherein the electric motor and the control circuit are operated by electric power of a dry cell. The combustion apparatus according to claim 2, wherein
The control circuit is equipped with a microcomputer,
The switch failure handling means sets both the first valve and the second valve to a closed state when the ON / OFF transition state of the first switch and the second switch is not a preset transition state. A combustion apparatus characterized by turning off the power of the microcomputer. The combustion apparatus according to any one of claims 1 to 3,
The combustion apparatus, wherein the first burner and the second burner heat a heat exchanger for remedy for bathing.

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