JP3233788B2 - Open gas combustion equipment with incomplete combustion prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open-type gas combustion apparatus of a supply / discharge type which takes combustion air from a room, such as a main stop type gas water heater, and discharges a combustion gas from the gas combustion apparatus into the room as it is. More specifically, an open type with an incomplete combustion prevention device that shuts off a gas passage before such a gas combustion device causes incomplete combustion due to poor ventilation of a room or clogged fins of a heat exchanger, etc. It relates to gas combustion equipment.

[0002]

2. Description of the Related Art Conventionally, as an open-type gas combustion apparatus of this type, for example, a main stop-type gas water heater or the like, when ventilation in the room is insufficient or a heat exchanger in the apparatus becomes dirty and the fins become dirty. When clogging occurs, it becomes difficult for air required for combustion to be taken into the appliance. In such a case, in any case, incomplete combustion may occur, which may cause an accident. This has become a major problem, especially in view of the recent hermetic housing structure. Therefore, in order to solve these problems and use them more safely, an incomplete combustion prevention device has been installed on these open-type gas-fired devices, and the system has been designed to stop the gas before it becomes dangerous and maintain safety. I have.

Such a device for preventing incomplete combustion includes, for example, as shown in FIG. 21, a thermocouple (1) facing a flame of a burner and a thermocouple (1) facing a window of a combustion chamber below a heat exchanger. 2) are connected so that the positive and negative polarities are opposite to each other, and the electromotive force (V ₁ ) generated by the thermocouple (1) is converted from the electromotive force (V ₁ ) generated by the thermocouple (2) to the magnet safety valve. The electromotive force obtained by subtracting V ₂ ) becomes a force for holding the magnet safety valve. When the oxygen concentration in the room decreases, the burner flame lifts, the electromotive force of the thermocouple (1) decreases, and the combined electromotive force of V ₁ -V ₂ decreases, so that the magnet safety valve cannot be held. The gas supply is shut off.
Also, if the heat exchanger is clogged due to long-term use,
Since the electromotive force of the thermocouple (2) in the inner body is increased by the heat of the combustion exhaust, and the combined electromotive force of V ₁ -V ₂ is reduced as described above, 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 when a certain combustion state is reached.

In this type of gas water heater, combustion is automatically stopped after a certain period of use by operating a timer,
Some devices are designed to maintain the safety in using the device, and some devices use the timer to regulate the use time and use the device in combination with the incomplete combustion prevention device to ensure the safety in using the device.

[0005]

However, any of the devices generally known in the prior art are intended to ensure safety in using the instrument under individual conditions. For example, if the usage time is regulated by a timer, the operation is stopped only after the time elapses, and if the incomplete combustion prevention device is equipped, the operation is started only when the combustion state reaches a certain condition. It will be stopped.

[0006] Further, in the case where the use time regulation by the timer and the incomplete combustion prevention device are used together, the operation is stopped only when any one of the conditions is satisfied. Whether the continuation or stop of the operation was determined depending on the conditions.

[0007] However, in this open-type gas combustion apparatus, the air pollution rate of the room greatly differs depending on the use environment, for example, the size (size) of the room to be used (or installed) and the degree of ventilation of the room. In turn, the permissible operating time for continuous operation is naturally different.

Therefore, if the operation is controlled under the individual conditions as described above without considering such a difference in the use environment, the operation is performed in a place where there is much more margin than 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 truly secure the relationship between the detection level of the incomplete combustion state and the continuous operation time. An object of the present invention is to provide an open-type gas combustion device with an incomplete combustion prevention device which is controlled at a necessary place. This is intended to avoid malfunctions in safety due to differences in the use 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 for detecting a combustion state; Combustion time for setting one continuous combustion time in an open-type gas combustion apparatus with an incomplete combustion prevention device comprising: a combustion stop means for stopping combustion when an abnormality in the combustion state is detected by an output signal from the means. Setting means, timer means for measuring the combustion time, output gradient judging means for judging an output change gradient due to a change in combustion state based on an output signal from the detection sensor means, and a judgment result by the output gradient judging means. Combustion time changing means for changing the combustion time set by the combustion time setting means based on the combustion time. It is an Abstract that configured to be.

In this case, a warning signal is issued shortly before the combustion time changed by the combustion time changing means elapses, and an alarm is issued when the combustion time changed by the combustion time changing means elapses. It is preferable to further include combustion stop alarm means. Then, the user of this gas-fired device will be informed that ventilation in the room is necessary, and that the necessity of maintenance of the device itself is required, etc., and the usability of this device will be further improved. It is.

A second aspect of the present invention is an incomplete combustion prevention detection sensor means for detecting a combustion state, and a combustion stop means for stopping combustion when an abnormality in the combustion state is detected by an output signal from the detection sensor means. Means for setting an output operation level of a detection sensor means operated by the combustion stopping means, and combustion by an output signal from the detection sensor means. Output gradient determining means for determining the output change gradient due to a change in state; and 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. Combustion is stopped when the output signal of the detection sensor means reaches the changed operation level. It is an Abstract that form.

[0013] In this case as well, an advance warning 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, or the output signal value from the detection sensor means. Is further provided with combustion stop alarm means for issuing an alarm when the operation level changed by the operation level change means is reached, to encourage the user of this gas-fired device to ventilate the room or to perform maintenance on the equipment. The gender and the like are notified, and the use of this easy-to-use device is achieved.

[0014]

According to the gas combustion apparatus of the present invention having such a configuration, according to the first aspect, in the combustion state of this apparatus, the combustion state is detected by the incomplete combustion prevention detection sensor means. When an abnormality in the combustion state is detected from the output signal from the sensor means, the combustion stop means operates to stop the combustion. However, during the operation, the combustion time is measured by the timer means. It may measure the time or the combustion time after the combustion enters a stable state.) During that time, the output signal from the detection sensor means causes the output due to the fluctuation of the combustion state to change. The change gradient is determined by the output gradient determining means. Then, the continuous burning time set by the burning time setting means is changed based on the determination result of the output gradient determining means, and the combustion is stopped when the changed burning time elapses. If it has the warning warning means, a warning will be issued shortly before the changed combustion time elapses, and if it has the combustion stop warning means,
An alarm will be issued when the changed combustion time has elapsed.

Further, according to the gas combustion apparatus of the second aspect, the combustion state is detected by the incomplete combustion prevention detection sensor in the combustion state of the apparatus, and the combustion state is detected by the output signal from the detection sensor. When the abnormality is detected, the combustion stopping means operates to stop the combustion. During the operation, the output change gradient due to the fluctuation of the combustion state is determined by the output gradient determining means by the output signal from the detection sensor means. Then, based on the determination result, the output operation level of the detection sensor means operated by 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.

In the case of the present invention as well, if the 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 is provided. Is provided, an 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 having a water supply pipe 16 and a tapping pipe 18 in an appliance body;
And a gas burner 14 for heating the gas. On the other hand, a water stopcock 20 is connected to the water supply pipe 16, and a gas supply plug 24 is connected to a gas pipe 22 that supplies gas to the gas burner 14. The stopcock 20 is provided with a faucet pilot valve 26, and the faucet pilot valve 26 is driven by a motor 28 to operate the interlock lever 3.
When opened through 0 and 32, water flows through the water supply line 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 opens in conjunction with the flow of water through the water supply pipe 16 and an ignition valve to prevent ignition trouble or the like. And a device stopper 38 provided to open and close the supply gas flow dew.

The faucet pilot valve 26 and the automatic gas valve 34 are connected via a valve shaft 40 or the like. When the faucet pilot valve 26 is opened, water flows.
The automatic gas valve 34 is automatically opened.

The magnet safety valve 36 is connected to the motor 28
, The valve operating rod 42 is pushed, and the magnet holding current flows and is excited to be held in the open state. Then, after the magnet safety valve 36 is held open, the instrument plug 38 is opened by the drive of 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.

The cam switch 4 is located close to the motor 28.
6 and 48, and the combination of the ON / OFF signals of the cam switches 46 and 48 in conjunction with the driving of the motor 28 opens the faucet pilot valve 26 of the stop faucet 20, and the magnet safety valve 36 Was held open by excitation, the instrument tap 38 was opened,
It is detected that the magnet safety valve 36 and the instrument stopper 38 are all closed.

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. Thus, the flow of water in the water supply pipe 16 is detected, and the driving of the motor 28 and the ignition operation of the gas burner 14 by the igniter are started by the ON signal of the water flow detection switch 50.

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

FIG. 2 is a block diagram showing a schematic configuration of the gas water heater 10. The same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
6 and a gas supply system (gas pipe 2)
Magnet safety valve 36 and instrument plug 3 provided in 2)
8 are connected to a motor 28, respectively. The motor 28 and the above-mentioned water flow switch 50 are connected to the burner controller 6.
2 is connected. An ignition switch 56 is connected to the burner controller 62.
8 and 60 are also connected. Further, the burner controller 62 is provided with a warning alarm 64 for warning the user of the appliance by a buzzer or the like in advance that the combustion stop state is approaching, and a combustion stop alarm 66 for notifying the user that the combustion has been stopped. Connected as needed.

In this embodiment, the primary thermocouple 58 provided near the gas burner 14 and the heat exchanger 1
2 is connected to the secondary thermocouple 60 provided in the vicinity of the second thermocouple 60 in the positive (+) and negative (−) polarities, and the secondary thermocouple is generated from the electromotive force (V ₁ ) generated by the primary thermocouple 58. The electromotive force (V) obtained by subtracting the electromotive force (V ₂ ) generated at 60
₁ -V ₂ ) is sent to the burner controller 62 as a signal.

In the burner controller 62, the combined electromotive force (V ₁ -V) of the primary thermocouple 58 and the secondary thermocouple 60
If V ₂ ) decreases, the flame of the gas burner may be extinguished due to a lift phenomenon or the like, or combustion exhaust heat may increase due to clogging of fins in the heat exchanger, resulting in incomplete combustion. Judge. When a command signal is sent from the burner controller 62 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 stopper 3
8 are closed and the risk of gas leakage when incomplete combustion occurs is avoided.

Next, various embodiments of the gas combustion equipment to which the present invention is applied will be described in order. First, Fig.3 ~
FIG. 7 shows a first embodiment of the present invention.
This is to change the allowable continuous combustion (operation) 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 judgment circuit 70, and is sent to the thermoelectromotive force level judgment circuit 70. The sensor output gradient determining circuit 72 determines a gradient of the sensor output value that changes with time from the obtained combined electromotive force value. An allowable continuous combustion (operation) time of the gas-fired device is set in advance by a computer, and when the burn time elapses, the gas-fired device is operated by a gas solenoid valve (magnet safety valve) 36.
Is automatically cut off, but this one continuous operation time is changed by the allowable continuous combustion time change circuit 74 based on the judgment result of the sensor output gradient judgment circuit 72 described above.

On the other hand, the combustion time is measured by the timer drive circuit 76 simultaneously with the start of the operation of the gas combustion apparatus, and the combustion time measured by the timer drive circuit 76 is compared with the changed continuous combustion time. Whether or not to continue combustion is determined by the combustion continuity determination circuit 78.

If the combustion continuation 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 reaches 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 specific circuit diagram for realizing the control block diagram shown in FIG. 3, and a description thereof will be omitted. However, it goes without saying that the combustion (operation) time can be measured in the same manner by using a digital type or an analog type by a microcomputer or the like.

FIG. 5 is a flowchart for explaining the operation of this embodiment. To explain this (although it may partially overlap with the description of the above-described block diagram), when the combustion (operation) is started, an initial value (T) of one continuous combustion (operation) time allowed first is set. _L ) is performed (step 1, described as "S1" in the figure). Then, timing (T) of the operation time is started (S2), and at the same time, a 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).

FIG. 6 shows the relationship between the operation time after the start of combustion and the output value of the detection sensor (combined output value) in such a state. when sensor output value becomes unstable combustion due to contamination (lack of oxygen), or of the heat exchanger fins clogging or the like of the air began to decrease, if the sensor output value has decreased to E ₁ is a computer It is determined whether or not it is (S4).

In the determination of S4, the output value of the detection sensor is E ₁
When it is determined that the temperature has decreased (S4: "YES"),
Next, the time until the detection sensor output value E ₂ becomes lower (t)
_X ) is counted (S5), and in parallel with this, the detection sensor output value (X _n ) is read over time (S6).

The output value of the detection sensor is used to calculate E2
Until it is determined whether or not decreased (S7), it is determined to have decreased (S7, "YES"), the time until the detection sensor output value as shown in FIG. 7 reaches the E ₂ from E ₁ ( t
_X ) and the allowable continuous operation time (T _LX ) are replaced with the above-mentioned initial setting value (T _L ) of the operating 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 output value of the detection sensor falls from E ₁ to E ₂ .
Is longer, the allowable continuous operation time (T _LX ) is longer. This progress is slow, or ventilation of the room air pollution in the detection of E ₁ of the sensor output value as the slow decrease in the E ₂ room is large (wide and) room (reduction in oxygen concentration) Is good, and it is determined that the use can be safely performed even if the operation time is so long. Conversely, for the case drop from E ₁ of sensor output values to the E ₂ is fast is safety problems such as contamination of the air in the room is progressing quickly, stopped quickly to shorten the operation time It is a judgment.

After changing the continuous operation time (T _L ) to T _LX in S8, it is always determined whether the operation time (T) from the start of operation has reached T _LX (S8).
9) At that time (T _LX ), the gas solenoid valve (electromagnetic safety valve 36) is turned off (OFF), a fire extinguishing operation is performed, and the operation is stopped (S10).

FIGS. 8 to 10 show modified embodiments of the present invention. Referring to the flowchart of FIG. 8, when the combustion (operation) is started, an initial value (T) of one continuous combustion (operation) time allowed first is set.
_L ) is performed (S11), and the measurement of the operation time (T) is started (S12). In parallel with this, the combined electromotive force (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 from the start of combustion and the output value of the detection sensor (combined output value). contamination when sensor output value becomes unstable combustion due like (lack of oxygen) is began to decrease, whether judges the detected sensor output value in the computer is reduced to an embodiment similar to the E ₁ of the aforementioned Is performed (S14).

[0039] And when sensor output value is determined in the S14 is is determined to have decreased to E ₁ (S14, "Y
ES "), the detected sensor output value immediately before that, that is, the fluctuation amount of the detected sensor output value and the allowable continuous operation time (T _LX ) as shown in FIG. 10 in comparison with the previously detected sensor output value. Is replaced with the above-mentioned initial setting value (T _L ) of the operating time (that is, one allowable continuous operating time is changed) (S15).

At this time, as is apparent from FIG. 10, the allowable continuous operation time (T _LX ) is shortened as the fluctuation of the output value of the detection sensor increases. This is because the larger the fluctuation of the output value of the detection sensor, the more the safety of the air in the room (the lowering of the oxygen concentration) is advanced, and the like. is there.

After changing the continuous operation time (T _L ) to T _LX in S15, it is always determined whether or not the operation time (T) from the start of operation has reached T _LX (S1).
6) At that time (T _LX ), the gas solenoid valve (electromagnetic safety valve 36) is turned off (OFF), a fire extinguishing operation is performed, and the operation is stopped (S17).

FIG. 11 shows a further modification. The flowchart of this modification will be described. When the detection sensor output value ( _Xn ) is read in S13 of the flowchart shown in FIG. 8 described above, the amount of change in the read detection sensor output value ( _Xn ) is obtained. It is determined whether or not is smaller than a predetermined reference value (K) (S31). When the fluctuation amount of the detection sensor output value is larger than the reference value (K) in S31, the combustion state is not yet stable, that is, This means that it is in the early stage of the combustion start, but when it is determined that the fluctuation amount of the detection sensor output value is smaller than the reference value (K) (S31, “YE
S)), it is determined that the combustion state has entered a stable period.

Simultaneously with the determination, the measurement of the combustion (operation) time (T) is started (S32), and at the same time, the reading of the detection sensor output value (X _n ) is continued at a predetermined cycle (S33). . Then, a continuous operation time (T _LX ) corresponding to the fluctuation amount of the output value of the detection sensor is set. When the actual combustion time T exceeds the set time T _LX , a fire extinguishing operation is performed (S35 to S36).

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 whose combustion is stopped in accordance with the change gradient of the output signal value of the incomplete combustion prevention detection sensor.

Referring to 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 the thermoelectromotive force level determination circuit 70. The sensor output gradient determining circuit 72 determines a gradient of the sensor output value that changes with time from the obtained combined electromotive force value. Then, based on the result of the determination by the sensor output gradient determining circuit 72, the sensor output value for stopping the combustion is changed in the detection sensor operation level changing circuit 82. Then, in the comparison with the thermoelectromotive force value determined by the aforementioned thermoelectromotive force level determination circuit 70 on the basis of the changed operation level, the combustion continuity determination circuit 78 determines whether or not to continue combustion.

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

FIG. 13 shows a flowchart of the operation. When the combustion (operation) is started, the operation level initial value (E) of the detection sensor for stopping the combustion when incomplete combustion occurs in the combustion state first. _O ) is set (S41), and then the primary thermocouple 58 and the secondary thermocouple 6 are set.
The combined electromotive force values (X _n ) by the two detection sensors of 0 are read over time (S42). FIG. 14 shows the relationship between the operation time after the start of combustion and the output value of the detection sensor (combined output value) in such a state. when sensor output value becomes unstable combustion by oxygen deficiency) is began to decrease, whether or not the sensor output value in the computer is reduced to the same manner as E ₁ and embodiments of the aforementioned are determined ( S43).

[0048] And when sensor output value is determined in the S43 it is determined to be lowered 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) Is to stop the combustion as soon as possible.

[0050] Then after changing the operation level of the detection sensor (E _O) to E _X in this S44, the primary thermocouple 5
8 and whether synthetic electromotive force of the secondary thermocouple 60 reaches E _X is determined at all times (S45), the gas solenoid valve is turned off when it becomes operational level to stop the combustion (E _X) ( O
FF), the fire extinguishing operation is performed, and the operation is stopped (S46).

FIGS. 16 to 18 relate to another embodiment of the present invention, and show a configuration having a function of issuing a warning notice shortly before reaching the operation level of stopping combustion. FIG. 16 is a control block diagram showing the control block diagram shown in FIG. 3, in which the combustion continuation determination circuit 78 is connected to the advance warning determination circuit 84. FIG. 17 is a specific circuit diagram for realizing the control block diagram. A warning alarm 86 such as a lamp or a buzzer is connected to an output side of an A / D (analog digital) converter or a microcomputer.

FIG. 18 shows a flow chart of this embodiment. Only the differences from the flow chart shown in FIG. 8 will be described. In S15 of FIG. 8, the continuous operation time (T _L ) is set to T. After changing to _LX , it is determined whether or not the operation time (T) from the start of operation approaches the time (T _LX ) before it is determined whether or not the operation time (T _LX ) has reached T _LX. The time (T _LX-1 ) is provided and is compared with this.) (S51), and when the reference time (one minute before T _LX ) is reached, the advance warning device is activated. Turn on (ON). Further, when the operation time (T) becomes the combustion stop time (T _LX ) due to the elapse of the combustion time, the gas solenoid valve is turned off (OFF), the fire extinguishing operation is performed, and the operation is stopped (S17). .

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

FIG. 20 shows a flow chart of this embodiment, which is a modification of the flow chart shown in FIG. That is, after changing the operation level of the detection sensor (E _O) to E _X at S44 in the flowchart of FIG. 13, whether synthetic electromotive force of the primary thermocouple 58 and the secondary thermocouple 60 has reached T _LX Operation level (E _S ) that issues an advance warning before it is judged
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 the pressure drops to, the gas solenoid valve is turned off (OFF) to perform a fire extinguishing operation, the operation is stopped (S46), and at the same time, the combustion stop alarm device is turned on (O).
N) and the user of the device 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 (lower oxygen concentration) and incomplete combustion occurs in the operation state of this type of open gas combustion equipment. At the beginning, the change gradient of the output value from a detection sensor such as a thermocouple that detects the combustion state is grasped, and when the output change gradient is large, it is determined that the progress of incomplete combustion is fast, and once If the continuous operation time is shortened or the combustion sensor is stopped, the combustion is stopped early by increasing the output value (operation level) of the detection sensor. On the other hand, when the change gradient of the output value from the detection sensor is small, Incomplete combustion is judged to be progressing slowly and one continuous operation time is lengthened, or the output value (operation level) of the combustion stop detection sensor is determined. It is to the delay the stop combustion by Kusuru. Thereby, the operation is continued or stopped appropriately in consideration of the use environment (room size, ventilation, etc.) of the gas combustion equipment.

Therefore, it is needless to say 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 instead of a thermocouple as a combustion state detection sensor, and the operation time and the combustion stop operation level of the detection sensor that are changed in accordance with the output change gradient of the detection sensor are also different. It would be possible to make it continuous and stepless without changing stepwise.

[0057]

As is apparent from the above description, according to the open-type gas combustion apparatus of the present invention, incomplete combustion is performed in accordance with the environment in which the apparatus is used (room size, ventilation, etc.). The timing of the combustion stop when the occurrence of the combustion starts is properly determined, and the combustion stop can be used in a state that is not too early and not too late, so that the safety in using the equipment is ensured, and Stoppage of combustion due to a malfunction is also avoided, so that the usability is improved. Therefore, it is extremely useful to apply this to a device with a conventional incomplete combustion device such as an open gas water heater in terms of improving safety and the like.

[Brief description of the 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 device to which the present invention is applied.

FIG. 2 is a schematic configuration diagram showing a main part of the configuration of the gas combustor shown in FIG. 1 in a block diagram.

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. 3;

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

FIG. 6 is a flowchart illustrating the process of FIG.
FIG. 4 is a diagram illustrating a relationship between an operation time and a combined thermal electromotive force output value of a detection sensor.

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

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

FIG. 9 is a flowchart of the flowchart shown in FIG.
FIG. 4 is a diagram illustrating a relationship between an operation time and a combined output value of a detection sensor.

FIG. 10 is a diagram illustrating a relationship between a variation amount of a combined output value of a detection sensor and an operation time to be changed in the description of the flowchart illustrated in FIG. 8;

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

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

FIG. 13 is a flowchart for executing the invention of the embodiment shown in FIG.

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

FIG. 15 is a diagram illustrating a relationship between a fluctuation amount of a combined output value of a detection sensor and a detection sensor output value (operation level) for stopping combustion to be changed in the description of the flowchart illustrated 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. 16;

FIG. 18 is a flowchart for executing the invention of the embodiment shown in FIG. 17;

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

20 is a flowchart for executing the embodiment shown in FIG.

FIG. 21 is an explanatory diagram of a configuration of a device for preventing incomplete combustion in a gas combustion device of this kind which is conventionally generally known.

[Explanation of symbols]

 Reference Signs List 10 main 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 judgment circuit 80 Gas solenoid valve 82 Sensor operation level change circuit 84 Warning alarm judgment circuit 86 Warning alarm 88 Combustion stop alarm

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/10 320 F23N 5/20 103 F23N 5/24 107 F24H 1/10 303

Claims (6)

(57) [Claims] Incomplete combustion comprising: an incomplete combustion prevention detection sensor 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. In an open-type gas combustion apparatus with a prevention device, a combustion time setting means for setting one continuous combustion time, a timer means for measuring the combustion time, and a combustion state change based on an 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. An open-type gas combustion apparatus with an incomplete combustion prevention device, wherein combustion is stopped when a time has elapsed. 2. An opening with an incomplete combustion prevention device according to claim 1, further comprising a warning means for issuing an alarm shortly before the combustion time changed by said combustion time changing means elapses. Type gas combustion equipment. 3. The incomplete combustion prevention device according to claim 1, further comprising a combustion stop alarm unit that issues an alarm when the combustion time changed by the combustion time changing unit has elapsed. With open gas combustion equipment. 4. 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 an open-type gas combustion apparatus with a prevention device, an operation level setting means for setting an output operation level of a detection sensor means operated by the combustion stopping means, and an output change caused by a change in a combustion state according to an output signal from the detection sensor means. Output gradient determining means for determining a gradient; and operation level changing means for changing an 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. The combustion is stopped when the output signal of the first engine reaches the changed operation level. Incomplete combustion prevention device with open gas-fired equipment. 5. The system according to claim 4, further comprising a warning means for issuing an alarm shortly before the output signal value from said detection sensor means reaches the operation level changed by the operation level changing means. Open gas combustion equipment with incomplete combustion prevention device. 6. A combustion stop alarm means for issuing an alarm when an output signal value from said detection sensor means reaches an operation level changed by an operation level changing means. An open-type gas combustion device with an incomplete combustion prevention device according to item 1.