JPH0828866A - Open type gas burner having incomplete combustion preventing device - Google Patents

Abstract

PURPOSE:To avoid an erroneous operation in view of safety caused by difference in use of environment of an open type gas burner by a method wherein a combustion time is changed in response to a result of discrimination of an output varying gradient caused by variation in combustion state and the combustion is stopped or terminated after elapsing of the changing time. CONSTITUTION:A primary thermocouple 58 is arranged near a gas burner and a secondary thermocouple 60 is arranged near a heat exchanger. The sum of the electromotive forces of the primary thermocouple 58 and the secondary thermocouple 60 is sent to a thermoelectromotive force level discriminating circuit 70 and a gradient varied in response to time of a sensor output value is discriminated by a sensor output gradient discriminating circuit 72 in reference to the resulting electromotive force value. Then, a time is counted by a timer driving circuit 76 in response to the result of this discrimination and whether or not the combustion is continued is discriminated by a combustion continuation available or non-available discriminating circuit. And this is further discriminated by the combustion continuation available or non-available discriminating circuit. In the case that it is discriminated at the combustion continuation available or non-available discriminating circuit that the combustion time does not reach the continuous combustion time discriminated, a gas solenoid valve driving circuit 80 is driven so as to shut off a gas solenoid valve (a magnet safety valve) 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply / discharge type open type gas combustion equipment such as a main stop type gas water heater which takes in combustion air from the room and discharges the combustion gas as it is from the gas combustion equipment into the room. , To be more precise, such an open type with an incomplete combustion prevention device that shuts off the gas passage before incomplete combustion occurs due to poor ventilation in the room or clogging of fins of the heat exchanger. The present invention relates to gas combustion equipment.

[0002]

2. Description of the Related Art Conventionally, as an open type gas combustion apparatus of this kind, for example, a main stop type gas water heater, when the ventilation in the room is insufficient or the heat exchanger in the apparatus is dirty, the fins are not visible. It becomes difficult for the air required for combustion to be taken into the device when it becomes clogged, but in such cases, incomplete combustion may lead to an accident. This is becoming a big problem, especially in view of the recently highly airtight housing structure. Therefore, in order to solve these problems and to use them more safely, we have installed an incomplete combustion prevention device on these open-type gas combustion equipment and have a mechanism to stop the gas before it becomes dangerous and keep it safe. There is.

Such an incomplete combustion preventing device is, for example, as shown in FIG. 21, a thermocouple (1) facing the flame of a burner and a thermocouple ((1) facing the combustion chamber window below the heat exchanger. 2) are connected so that the positive and negative polarities are opposite, and the electromotive force (V ₁ ) generated by the thermocouple (2) is changed to the electromotive force (V ₁ ) generated by the thermocouple (1) in the magnet safety valve. The electromotive force obtained by subtracting V ₂ ) becomes the force for holding the magnet safety valve. When the oxygen concentration in the room decreases, the flame of the burner lifts, the electromotive force of the thermocouple (1) decreases, and the combined electromotive force of V ₁ -V ₂ decreases, making it impossible to hold the magnet safety valve. The gas supply is cut off.
Also, when the heat exchanger blockages due to long-term use,
The electromotive force of the thermocouple (2) in the inner barrel portion is increased by the heat of combustion exhaust gas, and the combined electromotive force of V ₁ -V ₂ is reduced as described above, so that the magnet safety valve is closed. This is to stop the combustion when the oxygen (O ₂ ) concentration in the room reaches a certain value or a certain combustion state is reached.

Further, in this type of gas water heater, combustion is automatically stopped after a certain period of use due to the operation of a timer,
Some of them are designed to keep the safety of the equipment in use, and some of them are designed to ensure the safety of the equipment in use by restricting the usage time by this timer and using the above incomplete combustion prevention device together.

[0005]

However, all of the hitherto generally known ones are intended to ensure safety in using the device under individual conditions. For example, if the usage time is regulated by a timer, the operation will be stopped only after that time has passed, and if the incomplete combustion prevention device is installed, the operation will be started only when the combustion state reaches a certain condition. It will be stopped.

Further, in the case of using the restriction of the usage time by the timer and the incomplete combustion preventing device together, the operation is stopped only when one of the conditions is satisfied, and in each case, the operation is individually performed. It was decided whether to continue or stop the operation depending on the conditions.

However, in this open type gas combustion apparatus, the air pollution rate of the room varies greatly depending on the environment in which it is used (for example, the size (size) of the room used (or installed)) and the ventilation condition of the room. Therefore, the allowable operating time for continuous operation will naturally change.

Therefore, if it is attempted to control the operation under individual conditions as described above without considering such a difference in the operating environment, it will operate in a place where there is a considerable margin from the actual dangerous state in consideration of safety. I have to

The present invention has been made in order to solve such a problem, and an object of the present invention is to ensure that the relationship between the detection level of the incomplete combustion state and the continuous operation time can be safely ensured. An object of the present invention is to provide an open type gas combustion device equipped with an incomplete combustion prevention device that is controlled where necessary. In this way, it is intended to avoid malfunctions in terms of safety due to the difference in usage environment.

[0010]

In order to achieve this object, an open type gas combustion apparatus according to the present invention comprises, as a first invention, an incomplete combustion prevention detection sensor means for detecting a combustion state, and this detection sensor. In an open type gas combustion equipment with an incomplete combustion prevention device, which comprises combustion stopping means for stopping combustion when an abnormality in the combustion state is detected by an output signal from the means, a combustion time for setting one continuous combustion time Setting means, timer means for measuring the combustion time thereof, output gradient determining means for determining the output change gradient due to the change of the combustion state by the output signal from the detection sensor means, and the determination result by the output gradient determining means. Combustion time changing means for changing the combustion time set by the combustion time setting means based on the above, and the combustion is stopped when the changed combustion time elapses. It is an Abstract that configured to be.

In that case, a warning is issued shortly before the combustion time changed by the combustion time changing means is given, and an alarm is issued at the time when the combustion time changed by the combustion time changing means is passed. It is preferable to further include combustion stop warning means. If this is done, the user of this gas combustion device will be informed that there is a need for ventilation in the room, the need for maintenance of the device itself, etc., and the usability of this device will be further improved. Is.

A second aspect of the present invention is that the incomplete combustion prevention detection sensor means for detecting the combustion state, and the combustion stop for stopping the combustion when the abnormality of the combustion state is detected by the output signal from the detection sensor means. In an open type gas combustion device with an incomplete combustion prevention device, a combustion level is set by the operation level setting means for setting the output operation level of the detection sensor means on which the combustion stopping means works, and the output signal from the detection sensor means is also used for combustion. An output gradient determining means for determining the output change gradient due to a change in the state, and an operation level changing means for changing the output operation level of the detection sensor means set by the operation level setting means based on the determination result by the output gradient determining means. And so that combustion is stopped when the output signal of the detection sensor means reaches its modified operating level. It is an Abstract that form.

Also in this case, the output signal value from the advance warning means or the detection sensor means for issuing an alarm shortly before the output signal value from the detection sensor means reaches the operation level changed by the operation level changing means. Is further provided with a combustion stop alarm means for issuing an alarm when the operation level changed by the operation level change means is reached, so that the user of this gas combustion device is required to ventilate the room or maintain equipment. As the sex is known, the use of this device, which is also easy to use, is achieved.

[0014]

According to the gas combustion device of the present invention having such a structure, first, according to the first invention, the combustion state is detected by the incomplete combustion prevention detection sensor means in the combustion state of the device, and this detection is performed. When an abnormality in the combustion state is detected by the output signal from the sensor means, the combustion stopping means operates to stop the combustion, but the combustion time is measured by the timer means during the operation (the combustion from the start of the operation at this time). The time may be measured, or the combustion time may be measured after the combustion enters a stable state.) During that time, the output due to the fluctuation of the combustion state by the output signal from the detection sensor means. The change gradient is determined by the output gradient determining means. The continuous combustion time set by the combustion time setting means is changed based on the determination result of the output gradient determining means, and the combustion is stopped when the changed combustion time elapses. If a warning device is provided, an alarm will be issued shortly before the changed combustion time elapses, and if a combustion stop alarm device is provided,
An alarm will be issued when the changed combustion time elapses.

Further, according to the second aspect of the present invention, the combustion state is detected by the incomplete combustion prevention detection sensor means in the combustion state of the equipment, and the combustion state is obtained by the output signal from the detection sensor means. When the abnormality is detected, the combustion stop means operates to stop the combustion, and the output change gradient due to the change in the combustion state is determined by the output gradient determination means by the output signal from the detection sensor means during the operation. Then, based on the result of the determination, the output operation level of the detection sensor means for operating the combustion stopping means set by the operation level setting means is changed. The combustion is stopped when the output signal of the detection sensor means reaches the changed operation level.

Also in the case of the present invention, if the advance warning means is provided, the warning is issued shortly before the output signal value from the detection sensor means reaches the changed operation level, and the combustion stop warning means. With the above, the alarm is issued when the output signal value from the detection sensor means reaches the changed operation level.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a schematic configuration of a gas water heater to which the present invention is applied. As shown,
The gas water heater 10 includes a heat exchanger 12 including a water supply pipe 16 and a hot water discharge pipe 18 in the main body of the appliance, and the heat exchanger 12
And a gas burner 14 for heating the. On the other hand, a water stop cock 20 is connected to the water supply pipe 16, and a gas supply plug 24 is connected to the source of the gas pipe 22 for supplying gas to the gas burner 14. A water faucet pilot valve 26 is provided on the water stop cock 20, and the water faucet pilot valve 26 is driven by a motor 28 to operate the interlocking lever 3.
When opened through 0 and 32, water is adapted to flow through the water supply pipe 16.

A gas supply plug 24 provided in the gas pipe 22 of the gas burner 14 is provided with an automatic gas valve 34 which is opened in association with water flowing in the water supply pipe 16 and for preventing ignition troubles and the like. A magnet safety valve 36 and an instrument plug 38 provided for opening and closing the supply gas flow are respectively provided.

The faucet pilot valve 26 and the automatic gas valve 34 are connected to each other via the valve shaft 40 and the like, and when the faucet pilot valve 26 opens, water flows,
The automatic gas valve 34 is designed to be opened automatically.

The magnet safety valve 36 is connected to the motor 28.
The valve actuating rod 42 is pushed by the driving of, and the magnet holding current flows and is excited, whereby the valve operating rod 42 is held in the open state. Then, after the magnet safety valve 36 is held open, the instrument plug 38 is then opened by driving the motor 28, whereby the gas supply passage in the gas supply plug 24 is completely opened, and gas is supplied to the gas burner 14. At the same time, the gas burner 14 is ignited by the continuous spark of the ignition electrode 44 accompanying the ON operation of the igniter 43.

Further, the cam switch 4 is provided close to the motor 28.
6, 48 are provided, and the combination of the ON / OFF signals of the cam switches 46, 48 associated with the driving of the motor 28 causes the faucet pilot valve 26 of the water stopcock 20 to be opened, and the magnet safety valve 36. Was held open by excitation, the instrument plug 38 was opened, and the water stopcock 20
The fact that the magnet safety valve 36 and the instrument stopper 38 are all closed is detected.

A water flow detection switch 50 is provided near the valve shaft 40 connecting the faucet pilot valve 26 and the automatic gas valve 34, and the water flow detection switch 50 is turned on by the movement of the valve shaft 40. As a result, the flow of water in the water supply pipe 16 is detected, and the ON signal of the water flow detection switch 50 starts the driving of the motor 28 and the ignition operation of the gas burner 14 by the igniter.

An operation panel (not shown) of the instrument body is provided with an operation button 54 and an ignition switch 56 which is turned on by pressing the operation button 54, and the reference numeral 58 indicates the gas burner 1.
4 shows a primary thermocouple for detecting extinction of 4 and oxygen deficiency,
Further, reference numeral 60 denotes a secondary thermocouple provided to prevent incomplete combustion due to the fin clogging of the heat exchanger 12.

FIG. 2 is a block diagram showing a schematic structure of the gas water heater 10. The same components as those shown in FIG. 1 are designated by the same reference numerals and their detailed description will be omitted, but as shown in the figure, the water supply pipe 1
6, a water stopcock 20 and a gas supply system passage (gas pipe 2
2) Magnet safety valve 36 and device stopper 3
Each of 8 is connected to a motor 28. Further, the motor 28 and the water flow switch 50 described above are connected to the burner controller 6
2 is connected. An ignition switch 56 is connected to the burner controller 62, and further the thermocouple 5 described above is connected.
Both 8 and 60 are also connected. Furthermore, the burner controller 62 is provided with a warning alarm 64 that warns the user of this device in advance by a buzzer that the combustion stop state is approaching, and a combustion stop alarm 66 that notifies the user that the combustion has stopped. Connected as needed.

In this embodiment, the primary thermocouple 58 and the heat exchanger 1 provided near the gas burner 14 described above.
The secondary thermocouple 60, which is provided close to the second thermocouple 60, is connected in the direction of plus (+) / minus (−) in the opposite direction, and the electromotive force (V ₁ ) generated in the primary thermocouple 58 changes from the secondary thermocouple. 60 electromotive force generated by (V ₂₎ by subtracting the electromotive force (V
_1- V ₂ ) is sent to the burner controller 62 as a signal.

Then, in the burner controller 62, a combined electromotive force (V ₁ − of the primary thermocouple 58 and the secondary thermocouple 60).
If V ₂ ) decreases, the flame of the gas burner goes into a state of extinguishing due to a lift phenomenon or the like, or the heat of the combustion exhaust increases due to fin clogging of the heat exchanger, resulting in incomplete combustion. To judge. When the burner controller 62 sends a command signal to the motor 28, the motor 28 is driven and stopped. At the stop position of the motor 28, the magnet safety valve 36 and the instrument plug 3
All 8 are closed, avoiding the risk of gas leakage when incomplete combustion occurs.

Next, various embodiments of the gas combustion equipment to which the present invention is applied will be described in order. First of all,
FIG. 7 shows a first embodiment of the present invention.
This is to change the allowable continuous combustion (operating) time according to the change gradient of the output signal value of the incomplete combustion prevention detection sensor.

Referring to the control block diagram of FIG. 3, the combined electromotive force value of the primary thermocouple 58 and the secondary thermocouple 60 is sent to the thermoelectromotive force level determination circuit 70, and is sent to the thermoelectromotive force level determination circuit 70. The sensor output gradient determining circuit 72 determines the gradient of the sensor output value that changes with time from the obtained combined electromotive force value. The allowable single continuous combustion (operating) time of this gas combustion device is set in advance by a computer, and when this combustion time elapses, this gas combustion device will change to a gas solenoid valve (magnet safety valve) 36.
Is automatically shut off, but this one continuous operation time is changed by the allowable continuous combustion time changing circuit 74 based on the judgment result by the sensor output gradient judging circuit 72 described above.

On the other hand, the combustion time is measured by the timer drive circuit 76 at the same time when the operation of the gas combustion equipment is started, and the combustion time measured by the timer drive circuit 76 is compared with the above-mentioned changed continuous combustion time. Whether or not to continue the combustion is determined by the combustion continuity determination circuit 78.

If the combustion continuity determination circuit 78 determines that the combustion time has not yet reached the changed continuous combustion time, the combustion is continued, and the combustion time is changed to the changed continuous combustion time. When it reaches, the gas solenoid valve drive circuit 80 is driven and the gas solenoid valve (magnet safety valve) 36 is shut off.

FIG. 4 shows a concrete circuit diagram for realizing the control block diagram shown in FIG. 3 and its explanation is omitted. However, it goes without saying that the combustion (operating) time can be configured in the same manner by a digital type or an analog type by a microcomputer or the like.

FIG. 5 is a flow chart for explaining the operation of this embodiment. Explaining this (which may partially overlap the explanation of the block diagram above), when combustion (operation) is started, the initial value setting (T) of the first allowable continuous combustion (operation) time (T) is initially set. _L ) is performed (step 1, described as "S1" in the figure). Then, the operation time measurement (T) is started (S2), and in parallel therewith, the combined electromotive force value (X _n ) by the two detection sensors of the primary thermocouple 58 and the secondary thermocouple 60 is read with time ( S
3).

In such a state, FIG. 6 shows the relationship between the operating time after the start of combustion and the output value of the detection sensor (combined output value). If the combustion sensor becomes unstable due to air pollution (insufficient oxygen) or the fins of the heat exchanger are clogged and the output value of the detection sensor decreases, whether the output value of the detection sensor has decreased to E ₁ in the computer. It is determined whether or not (S4).

According to the determination of S4, the output value of the detection sensor is E ₁
When it is determined that the value has decreased to (S4: “YES”),
Then lower sensor output value E ₂ until the time (t
_X ) is measured (S5), and in parallel with this, the detection sensor output value ( _Xn ) is read over time (S6).

The output value of this detection sensor E2
(S7), and when it is determined that it has decreased (S7, “YES”), the time until the detection sensor output value reaches from E ₁ to E ₂ as shown in FIG. 7 ( t
_X ) and the allowable continuous operation time (T _LX ) are replaced with the continuous operation time, which replaces the above-mentioned initial setting value (T _L ) of the operation time (that is, one allowable continuous operation). The time is changed) (S8).

At this time, as is clear from FIG. 7, the time (t _X ) until the detection sensor output value decreases from E ₁ to E ₂ .
Is longer, the allowable continuous operation time (T _LX ) is longer. This is because as the detection sensor output value decreases from E ₁ to E ₂ later, the room is larger (wider) and the progress of air pollution (decrease in oxygen concentration) in the room is slower, or the ventilation status of the room. Is good, and it is due to the judgment that it is safe to use even if the operating time is extended to that extent. On the contrary, if the output value of the detection sensor decreases from E ₁ to E ₂ early, there is a safety problem such as that the air in the room is contaminated quickly, so shorten the operating time and stop it early. That is the judgment.

After the continuous operation time ( _TL ) is changed to _TLX in S8, it is constantly judged whether or not the operation time (T) from the start of operation reaches _TLX (S).
9) At that time (T _LX ), the gas solenoid valve (electromagnetic safety valve 36) is turned off (OFF) to perform the fire extinguishing operation, and the operation is stopped (S10).

8 to 10 show an embodiment as a modification of this. The flow chart of FIG. 8 will be described. When combustion (operation) is started, the initial value setting (T
_L ) is carried out (S11), and clocking of operating time (T) is started (S12). In parallel with that, the combined electromotive force value (X _n ) by the two detection sensors of the primary thermocouple 58 and the secondary thermocouple 60 is repeatedly read over time (S13).
However, in such a state, FIG. 9 shows the relationship between the operation time after the start of combustion and the detection sensor output value (combined output value). When combustion becomes unstable due to pollution (insufficient oxygen) and the detection sensor output value decreases, the computer determines whether the detection sensor output value has decreased to E ₁ as in the above-described embodiment. (S14).

When it is determined in S14 that the detection sensor output value has decreased to E ₁ (S14, "Y").
ES ”), the detection sensor output value immediately before that, that is, the variation amount of the detection sensor output value and the allowable continuous operation time (T _LX ) as shown in FIG. The initial set value ( _TL ) of the operating time described above is replaced with the continuous operating time determined from the relationship (i.e., the allowable single continuous operating time is changed) (S15).

At this time, as is clear from FIG. 10, the larger the fluctuation of the detection sensor output value, the shorter the allowable continuous operation time (T _LX ) is. This is because the larger the fluctuation in the output value of the detection sensor, the faster the air pollution in the room (decrease in oxygen concentration) and other safety problems. is there.

After the continuous operation time (T _L ) is changed to T _LX in S15, it is constantly judged whether or not the operation time (T) from the start of operation reaches T _LX (S1).
6) At that time (T _LX ), the gas solenoid valve (electromagnetic safety valve 36) is turned off (OFF) to perform the fire extinguishing operation, and the operation is stopped (S17).

Next, FIG. 11 shows a further modified example. Explaining the flow chart of this modified example, when the detection sensor output value (X _n ) is read in S13 of the flow chart shown in FIG. 8, the variation amount of the read detection sensor output value (X _n ) is obtained. Is determined to be smaller than a certain reference value (K) (S31), and when the variation amount of the detection sensor output value is larger than the reference value (K) in S31, the combustion state is not stable yet, that is, This means that it is in the initial stage of combustion, but when it is determined that the variation amount of the detection sensor output value is smaller than the reference value (K) (S31, “YE
S)) indicates that the combustion state has entered the stable period.

Simultaneously with the determination, the combustion (operating) time (T) starts to be measured (S32), and in parallel therewith, the reading of the detection sensor output value (X _n ) is continued at a predetermined cycle (S33). . Then, the continuous operation time (T _LX ) corresponding to the variation amount of the detection sensor output value is set, and when the actual combustion time T exceeds the set time T _LX , the fire extinguishing operation is performed (S35 to S36).

Next, FIGS. 12 to 15 show another embodiment of the present invention. This is to change the operation level (output signal value) of the detection sensor in which combustion is stopped according to the change gradient of the output signal value of the incomplete combustion prevention detection sensor.

Explaining the control block diagram of FIG. 12, the combined electromotive force value of the primary thermocouple 58 and the secondary thermocouple 60 is sent to the thermoelectromotive force level determination circuit 70, and is sent to this thermoelectromotive force level determination circuit 70. The sensor output gradient determining circuit 72 determines the gradient of the sensor output value that changes with time from the obtained combined electromotive force value. Then, the sensor output value for stopping combustion is changed in the detection sensor operation level changing circuit 82 based on the judgment result of the sensor output gradient judging circuit 72. Then, in the comparison with the thermoelectromotive force value determined by the thermoelectromotive force level determination circuit 70, the combustion continuity determination circuit 78 determines whether or not to continue the combustion based on the changed operation level.

That is, if it is determined that the thermoelectromotive force value determined by the thermoelectromotive force level determination circuit 70 has not fallen to the sensor operation level for performing the combustion stop operation, combustion is continued and the heat When the electromotive force value decreases to the operation level, the gas solenoid valve drive circuit 80 is driven and the gas solenoid valve (magnet safety valve) 36 is shut off.

FIG. 13 shows a flow chart thereof. When the combustion (operation) is started, the operation level initial value (E) of the detection sensor for stopping the combustion when the incomplete combustion first occurs in the combustion state (E _O ) is set (S41), and then the primary thermocouple 58 and the secondary thermocouple 6 are set.
The combined electromotive force value (X _n ) by the two detection sensors of 0 is read with time (S42). In such a state, FIG. 14 shows the relationship between the operation time after the start of combustion and the detection sensor output value (combined output value). From the stable combustion state, air pollution due to poor ventilation in the room ( When combustion becomes unstable due to (insufficient oxygen) and the detection sensor output value decreases, the computer determines whether the detection sensor output value has decreased to E ₁ as in the above-described embodiment ( S43).

When it is determined in S43 that the output value of the detection sensor has decreased to E ₁ (S43, "Y").
ES "), is determined from the relationship between the one of the front of the sensor output value and operating level of the detection sensor to stop the variation and combustion of sensor output values as shown in FIG. 15 in comparison to (E _X) sets the operating level of the sensor (E _X), replaces the initial set value of the above the (E _O) to E _X (S
44).

[0049] As apparent from FIG. 15 at this time, the larger the variation of the sensor output value, the operation level of the detection sensor to stop the combustion (E _X) are higher. This increases the contamination of the air in the room the larger the fluctuation of the sensor output value (the concentration of oxygen reduction) is quickly willing because of the safety problems such that the operation level of the detection sensor (E _X) The decision is to stop the combustion quickly.

After changing the operation level (E _O ) of the detection sensor to E _X in S44, the primary thermocouple 5
It is always judged whether the combined electromotive force value of 8 and the secondary thermocouple 60 has reached E _X (S45), and when the operation level (E _X ) for stopping the combustion is reached, the gas solenoid valve is turned off ( O
FF) is performed to extinguish the fire, and the operation is stopped (S46).

FIGS. 16 to 18 relate to another embodiment of the present invention, which shows a configuration provided with a function of issuing a preliminary warning shortly before reaching the operation level of combustion stop. FIG. 16 is a control block diagram thereof, which is configured by connecting the advance warning determination circuit 84 to the combustion continuation determination circuit 78 in the control block diagram shown in FIG. Further, FIG. 17 shows a concrete circuit diagram for realizing the control block diagram. An advance warning device 86 such as a lamp or a buzzer is connected to the output side of the A / D (analog / digital) converter or the microcomputer.

FIG. 18 shows a flow chart of this embodiment, and only the difference from the flow chart shown in FIG. 8 will be explained. However, in S15 of FIG. 8, the continuous operation time (T _L ) is T after changing the _LX is another reference in its whether approached time (T _LX) (this example before whether the operating time from the operation start (T) has reached T _LX is determined The time (T _LX-1 ) is provided and it is judged by comparison with this) (S51), and when the reference time (1 minute before T _LX ) is reached, the warning alarm device is activated. Turn it on. Further, when the operating time (T) reaches the combustion stop time (T _LX ) due to the lapse of the combustion time, the gas solenoid valve is turned off (OFF) to perform the fire extinguishing operation, and the operation is stopped (S17). .

FIG. 19 and FIG. 20 show a structure having a combustion stop warning function when combustion is stopped in addition to the advance warning device. 19 shows a specific circuit diagram thereof, a combustion stop alarm 88 is connected to the output side of the A / D converter or the microcomputer in addition to the advance warning alarm 86.

FIG. 20 shows a flowchart of this embodiment, which is shown as a modification of the flowchart shown in FIG. That is, whether or not the combined electromotive force value of the primary thermocouple 58 and the secondary thermocouple 60 has reached T _LX after the operation level (E _O ) of the detection sensor is changed to E _X in S44 of the flowchart of FIG. There operating level that emits warning alarm before it is determined (E _S)
It is determined whether or not reached is (S61), the operating level (E _S) warning alarm device at which point is turned on (ON), the operation level for stopping the combustion further over time (E _X) When it goes down to 0, the gas solenoid valve is turned off (OFF) to perform the fire extinguishing operation, and the operation is stopped (S46), and at the same time, the combustion stop alarm device is turned on (O).
N) and the device user is alerted (S6).
3).

Although various embodiments have been described above, the gist of the present invention is that the air in the room is contaminated (the oxygen concentration is lowered) and incomplete combustion occurs in the operating state of this type of open gas combustion equipment. At the beginning, grasp the change gradient of the output value from a detection sensor such as a thermocouple that detects the combustion state, and if the output change gradient is large, judge that the progress of incomplete combustion is fast Combustion is stopped early by shortening the continuous operation time or increasing the output value (operation level) of the detection sensor that stops combustion. On the other hand, when the change gradient of the output value from the detection sensor is small It is judged that incomplete combustion is progressing slowly, and the operation time for one continuous operation is lengthened, or the output value (operation level) of the detection sensor for combustion stop is set. It is to the delay the stop combustion by Kusuru. Thus, the operation of the gas combustion device is appropriately continued or stopped in consideration of the usage environment (room size, ventilation, etc.).

Therefore, it goes without saying that various modifications and improvements can be made without departing from the spirit of the present invention. For example, a gas sensor or the like can be used as the combustion state detection sensor instead of the thermocouple, and the operating time and the combustion stop operation level of the detection sensor that are changed according to the output change gradient of the detection sensor are also separately. It would be possible to make it continuous and stepless without changing it stepwise.

[0057]

As is apparent from the above description, according to the open type gas combustion device of the present invention, incomplete combustion is caused depending on the environment (room size, ventilation, etc.) in which the device is used. If the combustion stop timing is properly determined when the start of combustion occurs, it can be used in a state where the combustion stop is not too early and not too late, so safety in using the device is secured, and Combustion stop due to malfunction is also avoided, and the usability is improved. Therefore, it is extremely beneficial to apply this to an open type gas water heater or the like having a conventional incomplete combustion device in terms of improving safety.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a main stop type gas water heater as an example of an open type gas combustion apparatus to which the present invention is applied.

FIG. 2 is a schematic block diagram showing a block diagram of a main part of the configuration of the gas combustor shown in FIG.

FIG. 3 is a control block diagram as one embodiment of the present invention.

FIG. 4 is a specific electric circuit diagram for realizing the embodiment shown in FIG.

5 is a flowchart for carrying out the invention of the embodiment shown in FIGS. 3 and 4. FIG.

6 is an explanatory diagram of the flowchart shown in FIG.
It is the figure which showed the relationship between the driving | running time and the synthetic thermoelectromotive force output value of a detection sensor.

FIG. 7 is a diagram showing a relationship between a decrease time of the combined output value of the detection sensor and an operation time to be changed in the explanation of the flowchart shown in FIG.

FIG. 8 is a flowchart as another embodiment of the present invention.

9 is an explanatory diagram of the flowchart shown in FIG.
It is the figure which showed the relationship between the driving time and the synthetic output value of a detection sensor.

10 is a diagram showing the relationship between the variation amount of the combined output value of the detection sensor and the operating time to be changed in the explanation of the flowchart shown in FIG.

FIG. 11 is a flowchart as yet another embodiment of the present invention.

FIG. 12 is a control block diagram as still another embodiment of the present invention.

13 is a flow chart for carrying out the invention of the embodiment shown in FIG.

FIG. 14 is a diagram showing the relationship between the operating time and the combined thermoelectromotive force output value of the detection sensor in the explanation of the flowchart shown in FIG. 13.

FIG. 15 is a diagram showing the relationship between the variation amount of the combined output value of the detection sensor and the detection sensor output value (operation level) for stopping combustion that should be changed in the explanation of the flowchart shown in FIG. 13.

FIG. 16 is a control block diagram as still another embodiment of the present invention.

FIG. 17 is a specific electric circuit diagram for realizing the embodiment shown in FIG.

18 is a flow chart for carrying out the invention of the embodiment shown in FIG.

FIG. 19 is an electric circuit diagram as still another embodiment of the present invention.

20 is a flow chart for executing the embodiment shown in FIG.

FIG. 21 is a structural explanatory view of an incomplete combustion prevention device in this type of gas combustion device that is generally known in the past.

[Explanation of symbols]

 10 original stop type gas water heater 36 magnet safety valve (gas solenoid valve) 58 primary thermocouple 60 secondary thermocouple 70 thermoelectromotive force level determination circuit 72 sensor output gradient determination circuit 74 allowable continuous combustion time change circuit 76 timer drive circuit 78 Combustion continuity determination circuit 80 Gas solenoid valve 82 Sensor operation level change circuit 84 Advance warning alarm determination circuit 86 Advance warning alarm 88 Combustion stop alarm

Claims (6)

[Claims] 1. An incomplete combustion, comprising incomplete combustion prevention detection sensor means for detecting a combustion state, and combustion stop means for stopping combustion when an abnormality in the combustion state is detected by an output signal from the detection sensor means. In the open-type gas combustion equipment with a protection device, the combustion time setting means for setting one continuous combustion time, the timer means for measuring the combustion time, and the fluctuation of the combustion state by the output signal from the detection sensor means Output gradient determining means for determining the output change gradient and combustion time changing means for changing the combustion time set by the combustion time setting means based on the determination result by the output gradient determining means are provided. An open type gas combustion device with an incomplete combustion prevention device, characterized in that the combustion is stopped when time has elapsed. 2. The opening with an incomplete combustion prevention device according to claim 1, further comprising advance warning means for issuing an alarm shortly before the combustion time changed by the combustion time changing means has elapsed. Type gas combustion equipment. 3. The incomplete combustion prevention device according to claim 1, further comprising combustion stop warning means for issuing an alarm when the combustion time changed by the combustion time changing means has elapsed. Open type gas combustion equipment with. 4. An incomplete combustion including an incomplete combustion prevention detection sensor means for detecting a combustion state, and a combustion stopping means for stopping combustion when an abnormality in the combustion state is detected by an output signal from the detection sensor means. In an open-type gas combustion device with a prevention device, an operation level setting means for setting an output operation level of a detection sensor means on which the combustion stopping means operates, and a change in the output due to a change in combustion state by an output signal from the detection sensor means The detection sensor means includes an output gradient determination means for determining a gradient and an operation level changing means for changing the output operation level of the detection sensor means set by the operation level setting means based on the determination result by the output gradient determination means. Combustion is stopped when the output signal of the engine reaches its modified operating level. Incomplete combustion prevention device with open gas-fired equipment. 5. The advance warning unit for issuing an alarm shortly before the output signal value from the detection sensor unit reaches the operation level changed by the operation level changing unit. Open gas combustion equipment with incomplete combustion prevention device. 6. The combustion stop warning means for issuing an alarm when the output signal value from the detection sensor means reaches the operation level changed by the operation level changing means is further provided. An open type gas combustion device with an incomplete combustion prevention device described in.