JP3848780B2 - Combustion device with safety device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a combustion apparatus, such as a balance type bath, in which fuel is supplied by opening and closing a solenoid valve and combustion is confirmed by lighting a combustion lamp.
[0002]
[Prior art]
Conventionally, in a combustion apparatus such as a balance bath, the fuel supply system is opened by a solenoid valve, the burner is ignited, a flame is detected using a thermocouple or a frame rod, and the ignition is confirmed before combustion. The operation is continued. In addition, the combustion lamp is turned on during combustion so that the user can confirm that it is burning, and such a combustion lamp is particularly used in a combustion apparatus in which a viewing window or the like is not disposed near the burner. This is an important safety device because it is a clue to confirm the presence or absence of ignition check and extinction in the ignition operation.
[0003]
On the other hand, since such a balanced bath is installed in a bathroom, it is not preferable to connect a commercial power source in order to avoid a risk of electric leakage or the like. For this reason, electrical components such as the above-described solenoid valve necessary for combustion control, a flame rod for safe combustion, and a combustion lamp that require a drive current are supplied by a built-in battery. For this reason, the device for power saving is required so that a built-in battery may not be consumed wastefully.
[0004]
[Problems to be solved by the invention]
By the way, prevention of explosion ignition in the combustion apparatus is particularly important in safe combustion.
In such explosion ignition, before the combustion operation, after supplying the fuel to the combustion device and performing the ignition operation, ignition is not performed correctly, and raw gas is generated, and this raw gas accumulates in the instrument, This may ignite.
It is necessary to prevent such explosion ignition, and various countermeasures have been studied, but it is still insufficient.
[0005]
The present invention has been made in order to solve the above-described problems, and can prevent an explosion ignition caused by igniting gas accumulated in an appliance, and can save power during operation. The purpose is to provide.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an instrument plug device including an instrument plug that is manually opened and burned by a burner to which gas is supplied by the opening operation of the instrument plug. An electromagnetic valve for opening and closing a fuel supply system, an ignition means for igniting the burner, and the electromagnetic valve regardless of whether or not an instrument plug is operated during combustion. In contrast, a thermocouple for supplying a driving current for maintaining the opening operation and a combustion lamp for confirming the combustion of the burner are provided, and the solenoid valve is manually opened by operating the instrument plug. performs an ignition operation Te, when ignited, causes lights the combustion lamp, by also turning on the combustion lamp after a lapse of a predetermined time set in advance if no ignition of the plug fitting by the manual by the user The combustion apparatus provided with a safety device that is configured to urge the stop can operation is achieved.
[0007]
According to the configuration of claim 1, in this combustion apparatus, when the user presses the instrument plug to supply fuel prior to the ignition operation of the instrument, the electromagnetic valve is opened in conjunction with this, and the burner is Is supplied with fuel. Next, an ignition operation is performed, and, for example, spark discharge is performed on the supplied fuel gas. As a result, when the fuel gas is ignited, the combustion lamp is turned on. As a result, the user sees the lighting of the combustion lamp and removes the hand from the instrument plug.
[0008]
Here, when the burner is correctly ignited, the combustion is performed, so that the solenoid valve is opened based on the electromotive force of the thermocouple, and the fuel is supplied. For this reason, in order to maintain the opening operation of the solenoid valve, for example, power saving can be achieved because it is not necessary to use a built-in battery or the like.
On the other hand, if the burner is not ignited even after ignition, combustion is not performed and no electromotive force can be obtained from the thermocouple, so the solenoid valve tries to close but an instrument plug is used. In the case where it is continuously pushed by the person, the solenoid valve linked with this is kept open, so that the fuel supply system is kept open. In this state, raw gas accumulates in the instrument. Here, even if the ignition operation does not cause ignition, the combustion lamp is turned on after a predetermined time. As a result, when the user visually recognizes that the combustion lamp is lit, it is assumed that the user has ignited, and the user releases his hand from the instrument plug knob. In conjunction with this, the solenoid valve is also closed. For this reason, it is prevented that fuel gas accumulates in the instrument without ignition.
Therefore, the above-mentioned “predetermined time” refers to, for example, measuring in advance the time during which fuel gas does not accumulate to the extent that explosion ignition occurs in the instrument when the fuel gas continues to be supplied without ignition, according to the instrument. Determined.
[0013]
Further, in the invention of claim 2, the above object is in the combustion of the appliance plug device provided with the appliance plug that is manually opened and burner to which gas is supplied by the opening operation of the appliance plug. Regardless of whether or not the instrument plug is operated during combustion, the solenoid valve for opening and closing the fuel supply system, the ignition means for igniting the burner, and the opening operation of the instrument plug being continued. A thermocouple for supplying a driving current for maintaining the opening operation with respect to the solenoid valve, a flame detecting means which is disposed in the combustion flame and is given a predetermined driving current to detect the flame current, and flame detection A combustion lamp that is turned on and off based on the detection result of the means, and operates the appliance plug to manually open the solenoid valve to perform an ignition operation. , The place where it does not ignite By also turns on the combustion lamp after the lapse first predetermined time predetermined for further configured to prompt them to stop the manual opening of the plug fitting operation by the user, during combustion, said flame detecting means This is achieved by a combustion device equipped with a safety device that is configured to save power by being driven intermittently at predetermined second predetermined times.
[0014]
According to the configuration of the second aspect, it is possible to save power while avoiding explosion ignition during ignition and combustion.
[0015]
According to a third aspect of the present invention, in the configuration of the second aspect of the present invention, the flame detection means is constituted by a frame rod, and the thermocouple and the flame detection means function separately. To do.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. As long as there is no description of the effect, it is not restricted to these aspects.
[0017]
FIG. 1 is a system diagram showing a main configuration of a balance-type bath as a combined combustion apparatus according to an embodiment of the present invention.
In the figure, a combined combustion apparatus (balanced bath tub) 50 is a combined bath tub with a hot water heater, and includes a burner 1 for bathing and a burner 2 for hot water, each of which has heat for bath. The exchanger 3 and the heat exchanger 4 for hot water supply are heated to have two functions of bathing and hot water supply. Further, a control unit 62 and a built-in battery 63 are provided. The control unit 62 controls the operation of the combined combustion apparatus 50 as will be described later, and supplies the electric power of the built-in battery 63 to an electrical transmission that requires it. Therefore, as will be described later, in the combined combustion apparatus 50 that is a balance bath, consumption of the internal battery 63 is suppressed as much as possible.
[0018]
The bath heat exchanger 3 is connected to a recirculation circulation line 5, which is connected to a bathtub 16 via a circulation fitting 15. The bath burner 1 is provided with an air heating prevention device 64.
[0019]
On the other hand, the hot water supply side will be described. The water supply pipe 6 is connected to the diaphragm case 7b. A diaphragm 7a is accommodated in the diaphragm case 7b.
After the water supplied through the water supply pipe 6 enters the diaphragm case 7b, it branches into two pipe lines 6b and 6c to reach the junction 6d. The pipe line 6b is a pipe line passing through the hot water supply heat exchanger 4, and the pipe line 6c passes through an orifice (not shown) disposed on the pipe line and reaches the junction 6d. A pipe line 6 c passing through the orifice is a bypass pipe of the heat exchanger 4. The water discharged from the high pressure side 7d of the diaphragm case 7b is reduced in pressure due to pressure loss while passing through the two pipe lines 6b and 6c. Accordingly, the pressure (dynamic pressure) at the junction 6d is lower than the high pressure side 7d of the diaphragm case 7b. Therefore, the diaphragm 7a is moved by the pressure difference between the junction 6d and the feed water pressure.
[0020]
Further, a hot water temperature knob 8 is connected to the water supply pipe 6, and a drain plug 7c is provided at the lower end of the diaphragm case 7b. A pipe line 6a as a pressure detection pipe extends from the low pressure side of the diaphragm case 7b and is connected to the hot water supply pipe 31 so as to detect the pressure at the junction 6d.
The diaphragm case 7b is divided into a high pressure side 7d and a low pressure side 7e by a diaphragm 7a. The high pressure side 7d and the low pressure side 7e have the same pressure when the tap is closed, but when opened, the low pressure side 7e has a pressure higher than the high pressure side 7d by the amount of pressure loss in the heat exchanger 4 or the like. Go down.
As a result, when the hot water tap is opened and water is supplied to the water supply pipe 6, the diaphragm 7a moves to the right in FIG. 1 based on the pressure difference. In response to this movement, the valve element 71 of the automatic water pressure gas valve 58 moves to the right against the urging force of the built-in spring, and sends fuel gas from a branch pipe 57 to be described later to the gas pipe 69, where the fuel gas is It comes to flow. That is, the diaphragm 7a moves due to the differential pressure generated when water flows, and the water pressure automatic gas valve opens only when water flows, and sends the fuel gas to the pipe 69.
[0021]
Further, the hot water supply pipe 31 is connected with a pressure relief device 59 and a water flow switch 9 as a detecting means so that hot water can be supplied to the following three locations.
That is, downstream of the water flow switch 9, the first hot water pipe 12 and the shower pipe 13 and the second hot water pipe 14 are connected via the hot water tap switching lever 11, and the hot water supply pipe 31 and the second hot water pipe 14 are connected. A bypass pipe 14 a is provided between them via the water electromagnetic valve 10. Further, in relation to the hot water supply side, a hot water supply heating prevention device 65 and a vessel body heat prevention device 61 are provided in the appliance, and are connected to the hot water heating prevention device 64 on the bath side. The water flow switch 9 may use other detection means such as a flow sensor.
[0022]
On the other hand, a fuel supply system for supplying fuel to each burner for bath and hot water is provided with a source gas solenoid valve 68 connected to a gas pipe extending from a gas supply source (not shown) for opening and closing the gas supply system. Yes. The downstream side of the original gas solenoid valve 68 is branched into three parts: a hot water supply gas pipe 34, a bath gas pipe 35, and a first pilot gas pipe 36.
[0023]
The hot water supply gas pipe 34 is connected to the hot water supply side burner 2 formed of two sets of burners via a hot water supply gas governor 19 and a first electromagnetic valve 23 which is a hot water supply gas on / off valve. The hot water supply side burner 2 is composed of a first burner 2-1 and a second burner 2-2, and the second burner 2-2 is provided with a second electromagnetic valve 24 for switching the capacity. Yes. Therefore, by opening and closing the capacity switching valve 24, combustion of only the first burner 2-1 and operation with high capacity by both the first and second burners can be performed. The second solenoid valve 24 is linked to the hot water temperature knob 8 described above.
[0024]
The bath gas pipe 35 is connected to the bath gas solenoid valve 29 via the bath gas governor 20 and further connected to the bath gas burner 1.
The first pilot gas pipe 36 is branched into one branch pipe 56 and the other branch pipe 57 at a branch point 67 in the instrument.
[0025]
The other branch pipe 57 is connected to the upstream side of the hydraulic automatic gas valve 58. The water pressure automatic gas valve 58 is connected to the high pressure side 7e of the diaphragm case 7b on the downstream side. In the water pressure automatic gas valve 58, the valve body 71 is urged toward the low pressure side 7d in the valve body case, and the valve body 71 has the diaphragm 7a on the right side due to the above-described differential pressure due to water flow. The fuel gas introduced from the upstream side of the hydraulic automatic gas valve 58 is sent to the second pilot gas pipe 69 connected to the downstream side and extending to the pilot burner 21. It is like that.
As a result, as will be described later, when a hot water supply operation is performed, fuel gas is supplied to the pilot burner 21 by the functions of the diaphragm case 7b and the water pressure automatic gas valve 58.
[0026]
The one branch pipe 56 is related to the bath combustion operation. That is, the one branch pipe 56 is connected to the instrument plug device 51. When the instrument plug device 51 is operated as described later and the valve body 55 of the gas valve is opened, the fuel gas is sent from the gas outlet to the conduit 91. Since the pipe line 91 is connected to the second pilot burner gas pipe 69, the fuel gas is sent to the pilot burner 21.
The pilot burner 21 is disposed adjacent to the above-mentioned bath and hot water supply burners, and the flame of the pilot burner transfers the fire to each of the burners for bath and hot water. Can be done.
[0027]
Therefore, prior to each combustion of the combined water heater, an ignition electrode 27 and an ignition device (igniter) for supplying a high voltage to the ignition electrode 27 are used as ignition means to cause the pilot burner to perform an ignition operation. 28 and a flame rod 26 and / or a thermocouple 25 for detecting a combustion flame in the pilot burner 21. In FIG. 1, the frame rod 26 and the thermocouple 25 are shown as one for convenience of illustration.
[0028]
Next, the instrument plug device 51 and the safe combustion device of the composite combustion device 50 will be described.
The instrument plug device 51 constitutes a part of ignition means and combustion safety device at the time of bath combustion. As shown in FIG. 4, the instrument plug device 51 includes an instrument plug knob 53 exposed from the upper end of the case 51 a and an instrument plug 52 connected to the instrument plug knob 53. The lower end portion is provided with a valve body 55 made of metal adsorbed by magnetic force in the case 51a. The case 51a accommodates a spring 53a as an urging means for urging the instrument plug 52 upward and a spring 53b as an urging means for urging the valve body 55 upward.
The case 51 a includes a gas outlet 71 and a gas inlet 72, and the valve body 55 opens and closes the boundary between the gas outlet 71 and the gas inlet 72. An electromagnet 39 is fixed to the lower end of the case 51 a, and the electromagnet 39 is connected to the thermocouple 25.
On the other hand, a micro switch 78 is arranged as a detecting means for detecting the movement of the instrument plug 52, and this micro switch 78 is connected to the control unit 62 as described later with reference to FIG. As will be described later, the control unit 62 gives an instruction to the original gas solenoid valve 68 by the operation of the micro switch 78.
[0029]
As a result, as will be described later, when the user pushes the instrument plug knob 53 and lowers the valve body 55, as shown in FIG. 3B, the metal valve body 55 is moved into the spring 53b within the case 51a. The fuel gas introduced from the gas inlet 72 rises across the boundary and is supplied from the gas outlet 71 to the pilot burner 21 as described above. Therefore, the pilot burner 21 burns when the fuel gas is ignited by the ignition device 28 and the electrode 27. During the combustion of the pilot burner 21, since the electromotive force of the thermocouple 25 is applied to the electromagnet 39, the electromagnet 39 forms a predetermined magnetic field. Since the force with which this magnetic field attracts the valve body 55 is set to be stronger than that of the spring 53b, the magnetic valve body 55 is attracted by this magnetic field, so that the boundary is kept open. become. Therefore, even if the user removes his / her hand from the instrument plug knob 53, the valve body 55 is held in the open position.
[0030]
In contrast, when the combustion of the pilot burner 21 is stopped or the electromotive force of the thermocouple 25 is extinguished by the safety device as will be described later, the magnetic field of the electromagnet 39 disappears as shown in FIG. Thus, the valve element 55 is pushed upward by the force of the spring 53b and closes the boundary, so that the supply of fuel gas is stopped.
[0031]
FIG. 2 is a block diagram showing an example of the electrical configuration of the safe combustion apparatus 40 of the combined combustion apparatus 50 with the control unit 62 at the center.
The safety device 40 includes a control unit 62. The control unit 62 may be configured by a predetermined relay circuit or the like in order to perform the control content described later, or may be configured by incorporating a CPU and a nonvolatile memory storing the control content. . In the following, an example in which a control program is operated by a CPU will be mainly described.
[0032]
The control unit 62 includes a built-in battery 63 as a power source, an original gas solenoid valve 68, a thermocouple 25 and / or a frame rod 26 as a flame detecting means, a combustion lamp 75, and first and second timing means to be described later. First timer 76, second timer 77, detection means for detecting that water has flowed into the hot water supply pipe, for example, water flow switch 9, detection means in conjunction with the operation of the instrument plug of instrument plug device 51 A micro switch 78 and an ignition device 28 as ignition means are connected.
The battery 63 supplies a predetermined power to the control unit 62 and supplies a drive current to the electromagnetic valve 68 according to a command from the control unit 62. Further, if necessary, a boosting means such as a capacitor or a transformer may be provided in the control unit 62 so that a drive current is supplied to the ignition electrode and other electrical components. In addition, the control unit 62 boosts the current supplied from the battery 63 to the control unit 62 and supplies the boosted current to the frame rod 26 as a detection drive current.
[0033]
Further, the control unit 62 instructs the electromagnetic valve 68 to open and close the electromagnetic valve 68 at a timing described later. In this case, the drive current of the electromagnetic valve 68 is given from the thermocouple 25 via the control unit 62 during combustion, and thereby the electromagnetic valve 68 is kept open.
[0034]
The combustion lamp 75 is supplied with a driving current for lighting from the battery 63 via the control unit 62. At this time, the control unit 62 performs on / off control of the combustion lamp 75 based on the detection result during the operation of the frame rod 26. The first timer 76 and the second timer 77 may be built in the control unit 62.
As will be described later, the first timer 76 is a timer for measuring the timing at which the combustion lamp 75 is lit even when ignition cannot be confirmed after the ignition operation. The second timer 77 is a timer for taking a timing for operating the frame rod 26 or the like as the flame detecting means.
[0035]
The combustion apparatus 10 is configured as described above, and can be operated as follows, for example. Here, FIGS. 8 and 9 show an example of the operation of the combustion apparatus 10 in detail, and the main points of this operation will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected in FIG. 8 FIG. 9 the corresponding location of each step demonstrated in FIG.
FIG. 5 is a flowchart showing an example of a chasing operation as an operation example at the time of ignition.
In the figure, when the user manually pushes the instrument wire knob 53 of the instrument stopper device 51 of the combustion apparatus 50 (ST11), the instrument stopper 52 is lowered by the pushing of the instrument stopper knob 53, which is the detection means of FIG. The micro switch 78 is turned on, and an on signal is input to the control unit 62. This will simultaneously do the following:
The control unit 62 starts measuring time by the first timer 76 (t1 = 0).
Then, a sparking discharge is performed by applying a drive current to an ignition device (igniter) 28 that supplies a high voltage to the ignition electrode 27.
Further, the control unit 62 supplies the power of the built-in battery 63 to the original gas solenoid valve 68, opens it, and introduces fuel gas from the fuel supply system. Further, since the valve body 55 of FIG. 3 is opened by pushing the instrument plug knob 53, the fuel gas is supplied to the pilot burner 21 through the gas pipe 69.
[0036]
Following this operation, the control unit 62 operates the frame rod 26. In other words, the control unit 62 operates the frame rod 26 at this timing without always placing the frame rod 26 in the monitoring state. At this time, the control unit 62 boosts the driving current of the battery 63 and applies the boosted current to the frame rod 26, detects the ignition flame, and confirms ignition (ST12).
Here, if ignition is confirmed, it will progress to ST15 and the control part 62 will give the drive current from the battery 63 to the combustion lamp 75, and will make the combustion lamp 75 light. As a result, when the user releases the hand from the state where the instrument plug knob 53 of the instrument plug device 51 is pushed and returns it (ST16), the combustion is continued as will be described later. That is, as described above, since the drive current from the thermocouple 25 is given to the electromagnet 39 of the appliance plug device 51 by the ignited combustion flame, the valve body 55 of the appliance plug device 51 is adsorbed by the magnetic field of the electromagnet 39. Thus, the gas outlet 71 is kept open.
[0037]
On the other hand, if the ignition cannot be confirmed in step 12, the process proceeds to ST13, and it is confirmed whether or not the measurement time of the first timer 76 that started the measurement in ST11 has passed a predetermined time, for example, 10 seconds. To do. The predetermined time measured by the first timer 76 measures in advance the time during which gas accumulates to the extent that there is a risk of explosive ignition if it is ignited and ignites in the instrument when ignition is not performed. Based on this, a safe range is determined and set for each instrument.
[0038]
In ST13, the ignition operation by the igniter 27 is repeatedly performed in ST14 until the predetermined time elapses. When it is determined in ST13 that the predetermined time has elapsed, the process proceeds to ST17.
[0039]
In ST <b> 17, the control unit 62 supplies power from the battery 63 to the combustion lamp 75 to light the combustion lamp 75. Accordingly, when the user visually recognizes that the combustion lamp 75 is turned on, it is determined that the ignition has been completed by the ignition operation. Therefore, in ST18, the instrument plug of the instrument plug device 51 is manually returned (removed). Thereby, the micro switch 78 is turned off, and the control unit 62 closes the original gas solenoid valve 68 (ST19). Further, by the operation of ST18, in the instrument plug device 51, the valve body 55 of FIG. 4 is pushed up and closed by the biasing force of the spring 53b, so that the supply of the fuel gas from the gas pipe 69 to the pilot burner 21 is stopped. . This prevents gas from accumulating in the instrument.
[0040]
That is, in this embodiment, after ignition operation, when ignition is not confirmed even after a predetermined time has elapsed, if spark discharge is performed while fuel gas is continuously sent, gas accumulates in the instrument, and this situation There is a risk of explosion ignition when igniting the accumulated gas. For this reason, in order to avoid this, the combustion lamp 75 is lit even though it is not combusting. When the user confirms that the combustion lamp 75 is turned on, he / she thinks that it has ignited, so he releases his hand from the instrument plug knob as usual, so that the valve body 55 closes the gas outlet 71 and supplies fuel gas as described above. It can be stopped and safe.
[0041]
Therefore, after the instrument plug device 51 is closed, if the control unit 62 turns off the combustion lamp 75 (ST20), the user sees it and performs the lighting operation from the beginning again, or the instrument has some trouble. You can take measures.
[0042]
In ST16, the pilot burner 21 is already burning, unlike the case of ST20, even if the user releases the instrument plug knob of the instrument plug device 51. For this reason, since an electromotive force is generated in the thermocouple 25, the electromotive force of the thermocouple 25 is also sent to the electromagnet 39 of the instrument plug device 51. For this reason, the valve body 55 continues to open the gas outlet 71 by the magnetic field of the electromagnet 39. Thereby, supply of fuel gas from the gas pipe 69 to the pilot burner 21 is continued, and combustion is continued.
The combustion flame of the pilot burner 21 is transferred to the bath burner 1 by supplying the fuel gas to the bath burner 1 by the opening operation of the bath gas solenoid valve 29 performed after the ignition is confirmed. In addition, additional combustion can be performed reliably.
[0043]
Thus, since the operation of the gas supply system to the pilot burner is performed by supplying power from the thermocouple 25, the battery 63 is not consumed, and power can be saved correspondingly. In other words, since the balance-type bath in the present embodiment is installed in the bathroom, a commercial power source cannot be connected in order to prevent leakage or the like. For this reason, there exists an advantage which can save the internal battery 63 especially.
[0044]
Next, the process proceeds to ST21, and the control unit 62 starts measuring time by the second timer 77 (ST21). Then, the control unit 62 boosts the electric power from the battery 63 to the flame detecting means such as the frame rod 26 and sends it for 0.2 seconds, for example, and monitors the combustion flame (ST22). This 0.2 second is the time required for flame detection and is set as appropriate. That is, since the power required for monitoring the flame is relatively large, the shortest time is selected and energized in order to suppress the consumption of the battery 63 as much as possible.
[0045]
Thus, in ST23, it is determined whether or not the combustion is stopped. If the combustion is in progress, the combustion is confirmed, the process proceeds to ST24, the flame detection is finished, and the second timer 77 determines in advance. For example, it is confirmed whether 30 seconds have passed as the predetermined time. After 30 seconds, the process returns to ST21, the control unit 62 resets the second timer 77, returns to ST23, and performs flame detection again. In this manner, the flame rod 26 as the flame detecting means is intermittently operated, thereby minimizing flame detection that consumes a relatively large amount of power and saving power. This is also a significant advantage in a balanced bath that requires power saving.
[0046]
If it is determined in ST23 that the combustion is stopped, no electromotive force is generated in the thermocouple 25 as described above. Therefore, the valve of the instrument plug device 51 to which the drive current is supplied from the thermocouple 25 The body 55 closes automatically. For this reason, as described above, the supply of the fuel gas from the gas pipe 69 is stopped, and the explosion ignition is prevented.
[0047]
Then, the control unit 62 proceeds to ST25, closes the original gas solenoid valve 68, turns off the combustion lamp, and allows the user to confirm that the combustion of the combustion apparatus 10 has stopped (ST26).
[0048]
Next, an example of the hot water supply operation of the combustion apparatus 10 will be described with reference to FIG.
When the user opens the hot water tap, water is passed through the water supply pipe 6 as described above. As a result, the diaphragm 7a moves to the right in FIG. 1 based on the pressure difference described above. In response to this movement, the valve element 71 of the water pressure automatic gas valve 58 moves to the right against the biasing force of the built-in spring, sends the fuel gas from the branch pipe 57 to the gas pipe 69, and supplies the fuel to the pilot burner 21. The gas flows (ST31).
[0049]
By the water flow, the water flow switch 9 as the detecting means is turned on. Upon receiving this ON signal, the control unit 62 activates the ignition device 28 and at the same time opens the original gas electromagnetic valve 68 with the power of the built-in battery 63 (ST32). ). Thereby, the pilot burner 21 is ignited.
Next, the control unit 62 opens the hot water supply gas solenoid valves 23 and 24 to send fuel gas to the hot water supply burners 2-1 and 2-2. As a result, the pilot burner 21 is transferred to the hot water supply burners 2-1 and 2-2, and combustion is started.
Next, the control unit 62 turns off the ignition device 28 (ST33), and the control unit 62 starts measuring time by the second timer 77 (ST34), as in the case of tracking. Then, the control unit 62 boosts the electric power from the battery 63 to the flame detection means such as the frame rod 26 and sends it for 0.2 seconds, for example, and monitors the combustion flame (ST35).
[0050]
Thus, in ST36, it is determined whether or not the combustion is stopped. If the combustion is in progress, the combustion is confirmed, the process proceeds to ST37, the flame detection is finished, and the second timer 77 determines in advance. For example, it is confirmed whether 30 seconds have passed as the predetermined time. After 30 seconds, the process returns to ST34, the control unit 62 resets the second timer 77, returns to ST35, and performs flame detection again. In this way, the flame rod 26 as the flame detecting means is intermittently operated to minimize the detection of the flame that consumes a relatively large amount of power, and to determine whether the combustion lamp is turned on or off. Like time, it is done while saving power.
On the other hand, if it is determined in ST36 that the combustion is stopped, the process proceeds to ST38, where the water flow switch 9 is confirmed to be turned off, the original gas solenoid valve 68 is closed (ST39), and the hot water supply combustion is completed. In this state, the user closes the hot water tap (ST40).
Even during this hot water combustion, when the pilot burner disappears, the valve body 55 is immediately closed by the thermocouple 25 in the same manner as when reheating, so safety is ensured.
[0051]
As described above, according to the above-described embodiment, it is possible to avoid the explosion ignition due to the repetition of the ignition operation for a long time, and the flame detection means for determining whether the combustion lamp is turned on or off is intermittently provided. By operating it, the built-in battery 63 can be saved and power saving can be achieved even in a balance-type bath that particularly requires power consumption. Furthermore, the driving of the valve body 55 of the instrument plug device 51 is performed without using the built-in battery 63, so that power saving can be achieved also in this respect.
[0052]
In the above-described embodiment, the main electromagnetic valve is driven by a battery and switched to driving by a thermocouple from the middle of the operation to interlock with the valve 55. However, the main electromagnetic valve may be mechanically interlocked with the valve 55 from the beginning.
In the above-described embodiment, the hot water heater has been described, but the present invention can be applied to any kind of combustion device as long as it is a combustion device that combusts fuel gas, a bath pot that uses gas or kerosene as fuel gas, The present invention can be widely applied to a heating device or the like, or an outdoor installation type of these devices.
[0053]
【The invention's effect】
As described above, according to the present invention, combustion with a safety device that can prevent explosion ignition caused by igniting the gas accumulated in the instrument and can save power during operation. An apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a configuration of a combustion apparatus according to an embodiment of the present invention.
2 is a block diagram showing a configuration of a combustion safety device of the combustion device of FIG. 1. FIG.
3 is an explanatory view showing an operation example of the instrument plug device of the combined combustion apparatus of FIG. 1; FIG.
4 is an explanatory diagram showing a configuration of a safety device of the combined combustion apparatus of FIG. 1. FIG.
FIG. 5 is a diagram showing a main part of an example of a safe operation at the time of ignition of the combustion apparatus of FIG. 1;
6 is a diagram showing a main part of an example of a safe operation during additional combustion of the combustion apparatus of FIG. 1;
7 is a diagram showing a main part of an example of a safe operation during hot water combustion of the combustion apparatus of FIG. 1;
8 is a diagram showing in detail an example of a safe operation during additional combustion of the combustion apparatus of FIG.
FIG. 9 is a diagram showing in detail an example of a safe operation during hot water combustion of the combustion apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bath burner 2 Hot water supply burner 3 Bath heat exchanger 4 Hot water heat exchanger 5 Circulation line 6 Water supply pipe 7 Water governor 9 Water flow switch 17 Fuel supply system (pipe)
21 Pilot burner 25 Thermocouple 27 Ignition electrode 28 Ignition device 31 Hot water supply pipe 33 Reheating water flow switch 34 Hot water supply gas pipe 35 Bath gas pipe 36 First pilot gas pipe 51 Instrument plug apparatus 53 Instrument plug knob 56 One branch Pipe 57 The other branch pipe 58 Water pressure automatic gas valve 61 Body overheat prevention device 62 Control unit 63 Built-in battery 64 Air-heating overheat prevention device 65 Hot water supply overheat prevention device 68 Original gas solenoid valve 75 Combustion lamp 76 First timer 77 Second Timer

Claims (3)

An instrument stopper device having an instrument stopper that is manually opened and operated;
An electromagnetic valve for opening and closing the fuel supply system, wherein the opening operation of the appliance plug is continued during combustion of the burner to which gas is supplied by the opening operation of the appliance plug;
Ignition means for igniting the burner;
A thermocouple that provides a drive current for maintaining an open operation for the solenoid valve regardless of whether or not an instrument plug is operated during combustion;
A combustion lamp for confirming combustion of the burner,
Operate the appliance plug and manually open the solenoid valve to perform the ignition operation. When ignited, the combustion lamp is turned on, and even when there is no ignition, the combustion lamp is turned on when a predetermined time has elapsed. By letting
A combustion apparatus provided with a safety device, characterized in that it is configured to urge the user to stop opening the instrument plug manually . An instrument stopper device having an instrument stopper that is manually opened and operated;
An electromagnetic valve for opening and closing the fuel supply system, wherein the opening operation of the appliance plug is continued during combustion of the burner to which gas is supplied by the opening operation of the appliance plug;
Ignition means for igniting the burner;
A thermocouple that provides a drive current for maintaining an open operation for the solenoid valve regardless of whether or not an instrument plug is operated during combustion;
Flame detection means arranged in the combustion flame and given a predetermined drive current to detect the flame current;
A combustion lamp that is turned on and off based on the detection result of the flame detection means,
When the ignition is performed by manually opening the solenoid valve by operating the appliance plug and igniting, the combustion lamp is turned on, and even when the ignition is not ignited, the combustion is performed after a predetermined first predetermined time elapses. By turning on the lamp,
A configuration that prompts the user to stop opening the instrument plug manually.
Further, during combustion, the flame detection means is driven intermittently at a predetermined second predetermined time so as to save power, and the combustion with a safety device is provided. apparatus.   The combustion apparatus having a safety device according to claim 2, wherein the flame detection means is constituted by a frame rod, and the thermocouple and the flame detection means function separately.

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