JPH10220744A - Co gas detection display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable proper detection of abnormality of combustion regardless of sharp or gradual increase in the concentration of CO and moreover, accurate determination of the cause of the abnormality. SOLUTION: This system is provided with a CO sensor 1 to detect CO in a combustion exhaust gas, a concentration judging means 3 which compares a detection value from the CO sensor 1 with a specified concentration reference value to output a concentration abnormality signal in a specified time after the detection value reaches the concentration reference value, an integration means 4 to calculate an integrated value obtained by time based integration of a difference between the detection value from the CO sensor 1 and a specified integration start reference value after the detection value reaches the specified integration start reference value, an integration judging means 5 to output an integration abnormality signal after the integrated value calculated by the integration means 4 reaches a specified integration reference value and a display means 2 to display the abnormal state corresponding to the respective abnormality signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CO which detects CO in combustion exhaust gas discharged from a combustion device and displays an abnormality in a combustion state when the CO concentration exceeds a predetermined level.
The present invention relates to a gas detection display system.

[0002]

2. Description of the Related Art In a gas combustion device such as a gas hot water supply device, the CO concentration in combustion exhaust gas is detected, and when the CO concentration exceeds a predetermined level, a combustion abnormality such as incomplete combustion occurs. By displaying the abnormality and stopping the combustion, abnormal combustion is prevented and safety is ensured.

Conventionally, for this purpose, a CO sensor is provided in the combustion exhaust gas, and a detection value from the CO sensor is compared with a preset reference value of the CO concentration. When the above conditions are met, the CO that issues an alarm or stops combustion
There was a gas detector. However, this device has a problem that an alarm is issued even though the actual total amount of CO emission is small, because the abnormality of the combustion is determined only by the detected value of the CO concentration in the combustion exhaust gas by the CO sensor. Also,
If the combustion state that generates a CO concentration in the vicinity of the reference value that is less than the reference value continues for a long time, the actual total amount of CO emissions increases. Leakage could lead to unexpected situations.

Therefore, in order to solve such a problem, as disclosed in Japanese Patent Application Laid-Open No. 5-26438,
After the detection value from the sensor reaches a predetermined integration start reference value, the difference between the detection value and the integration start reference value is time-integrated to calculate an integration value, and the integration value is equal to or greater than the predetermined integration reference value. An incomplete combustion prevention device that sometimes issues a warning or stops the device has been proposed.

[0005]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No.
In the incomplete combustion prevention device disclosed in Japanese Patent No. 26438, C
Even if the gradual increase in the O concentration can be appropriately dealt with, for example, when the combustion device is installed in a small room, even if the integrated value is low, the CO concentration may rapidly rise and fall into a dangerous state. There is.

Therefore, when the current CO concentration has reached a constant value or when the integrated value of the CO concentration difference has exceeded a certain value, an alarm operation or a combustion stop operation may be performed. Thus, it is difficult to specify whether an alarm or a stop operation has been performed, and it is difficult to take appropriate measures during maintenance.

The present invention has been made in view of the above-described problems, and has been made in view of the above. A detection display system is provided.

[0008]

According to a first aspect of the present invention, there is provided a CO gas detection and display system for detecting a CO in combustion exhaust gas, a detection value from the CO sensor and a predetermined value. A density determination unit that outputs a density abnormality signal after the detected value reaches the density reference value by comparing the detected value with the density reference value, and a difference between the two after the detection value from the CO sensor reaches the predetermined integration start reference value. Integrating means for calculating an integrated value obtained by time-integrating the signal, integration determining means for outputting an integrated abnormal signal after the integrated value calculated by the integrating means reaches a predetermined integrated reference value, Display means for displaying an abnormal state corresponding to each abnormal signal of the signal is provided.

According to the CO gas detection display system,
After the detected value of the CO sensor reaches a predetermined concentration reference value, the combustion abnormality is determined by the concentration determination means, and after the detection value reaches the integration start reference value, the integrated value calculated by the calculation means is calculated by the predetermined integration. The combustion abnormality after reaching the reference value is determined by the integration determination means, and after the determination, the concentration abnormality signal and the integration abnormality signal are output. Therefore, it is necessary to accurately detect abnormality in the CO concentration corresponding to various combustion abnormality patterns. Can be. Further, since the respective abnormal states corresponding to the concentration abnormal signal and the integrated abnormal signal are displayed on the display means, it is easy to find out the cause of the abnormality, and appropriate measures can be taken in maintenance.

According to a second aspect of the present invention, a plurality of reference values are set in any one or more of the concentration determining means, the integrating means, and the integrating determining means, and an abnormal signal is set in accordance with each of the reference values. Is output, and by displaying an abnormal state corresponding to each of the plurality of abnormal signals on the display means, it is possible to more accurately detect abnormalities in the CO concentration due to various causes, The cause of the abnormal state corresponding to each abnormal signal can be easily found, and the optimum treatment corresponding to each cause can be more easily performed in maintenance.

[0011]

FIG. 3 shows an embodiment of a hot water supply apparatus provided with a CO gas detection and display system according to the present invention. A boiler 21 is provided with an air supply fan 22 below the boiler 21. In the boiler 21, a gas burner 23 and a heat exchanger 24 above the gas burner 23 are provided. A water supply sensor 27 and a water supply pipe 27 provided with a water input thermistor 26 are connected to the upstream side of the heat exchanger 24, while the water amount adjustment valve 2 is connected to the downstream side.
8. A hot water supply pipe 30 provided with a hot water supply thermistor 29 is connected. The gas burner 23 has an original gas solenoid valve 31,
A gas supply pipe 33 having a gas proportional valve 32 is connected. The gas proportional valve 32 is for supplying a gas amount corresponding to the supply amount.

A CO sensor 1 is mounted near the exhaust port of the boiler 21 so as to contact the combustion exhaust gas. This CO sensor 1 has a bridge circuit provided with a gas detection element, and outputs a voltage (detection value) according to the CO gas concentration.

The hot water supply device is controlled by a controller 35. Outputs from various detectors are input to a control computer 36 in the controller 35, and the temperature is set from a remote control operation unit (not shown). Based on the hot water supply amount, an appropriate air supply amount and supply gas amount are controlled on the basis of the set hot water temperature. The supply amount is adjusted by the rotation speed of the fan 22, and the supply gas amount is adjusted by the gas proportional valve 32.

The control computer 36 has a C
It also controls the O gas detection and display system, and monitors the occurrence of abnormal combustion based on the detection value of the CO sensor 1. If an abnormal combustion occurs, the abnormality is detected by a liquid crystal device, a display lamp, or the like. It is displayed on the display means 2 and commands a combustion stop operation such as stopping the supply of gas as required.

FIG. 1 is a functional block diagram of a CO gas detection and display system. A detection value from a CO sensor 1 is input to a concentration determining means 3 and an integrating means 4. The density determination means 3 compares the detection value from the CO sensor 1 with one or more density reference values (hereinafter, described as A0 and B0) inputted in advance, and determines the detected value as each density reference value A0. , B0 and monitoring times tA, tB set in advance for each of the reference values A0, B0.
After the lapse of time, the density abnormal signals SA, S corresponding to the respective reference values A0, B0
B is output to the display means 2. Thereby, various abnormal states are displayed.

The concentration abnormality signals SA and SB are output to the combustion stopping means 6 and the storage means 7, respectively. The combustion stopping means 6 outputs a combustion stopping command, such as closing the original gas solenoid valve 11, to a predetermined device. The storage means 7 stores the density abnormal signal S
A and SB are stored together with their occurrence date and time according to the order of occurrence,
The data stored in response to the read command is output to the display means 2 to display the date and time of occurrence or the order of occurrence and the type of abnormal state. The display means 2 in FIG. 3 displays the date and time of occurrence or the order of occurrence on 2A of the liquid crystal display unit,
In 2B, the type of abnormal state corresponding to each of the density abnormal signals SA and SB is displayed. In FIG. 1, a portion surrounded by a broken line indicates a function realized by the control computer 36 in the controller 35.

On the other hand, the integrating means 4 is provided with a detection value inputted from the CO sensor and one or more integration starting reference values (hereinafter referred to as X0 and Y0) inputted beforehand to the integrating means 4. Are compared, and when the detection value reaches each integration start reference value X0, Y0, the difference between the detection value and each integration start reference value X0, Y0 is respectively time-integrated to calculate the integration value IX, IY, respectively. The integrated values IX and IY are output to the integration determining means 5. The integration determination means 5 compares the integration reference values IX0, IY0 input in advance corresponding to each of the integration start reference values X0, Y0 with the corresponding integration values IX, IY, and calculates each integration value IX, IY. When IY reaches the corresponding integration reference value IX0, IY0, the integration reference value IX0, IY0
Is output to the display means 2, the combustion stopping means 6 and the storage means 7. As in the case of the concentration error signal, the storage means 7 stores the error occurrence date and time and the accumulated error signals SX and SY in accordance with the order of occurrence, and the readout command indicates the error date and time and the like corresponding to each of the accumulated error signals SX and SY. The type of state is output to the display means 2.

If the storage means 7 is provided as described above, after the abnormal display and the combustion stop, emergency measures are taken, then the combustion stop command and the abnormal display are released by the reset command, and the boiler 21 is temporarily operated. Even in such a case, when a full-scale measure for removing the cause of the abnormality is taken thereafter, a display corresponding to each abnormal state can be read out as the abnormality occurrence history, and the maintenance property is excellent.

As the data to be stored in the storage means 7, it is not necessary to store all the abnormal signals generated in the past.
It may be data of an abnormal signal about the current stop or the previous stop. Also, data on the date and time of occurrence is not always necessary,
You may make it read sequentially from the latest. That is, the storage means 7 may store the concentration abnormal signal and the integrated abnormal signal, and output each abnormal signal to the display means 2 in response to a read command.

Next, a specific description will be given of a case where two different levels of reference values are set as the density reference values, and one level of reference value is set for each of the integration start reference value and the integration reference value. FIG. 2 shows the relationship between the detection value of the CO sensor and the elapsed time, where X0 is an integration start reference value, A0 is a first concentration reference value,
B0 is a second density reference value. Further, tA and tB are monitoring times after the CO sensor detection values reach A0 and B0 until the first and second concentration abnormality signals SA and SB are output. TX is CO
After the detection value of the sensor reaches X0, the difference (detection value-X0)
Indicates a time point at which the integrated abnormal signal SX is output when the integrated value obtained by time-integrating (in the figure, a portion IX indicated by hatching) reaches a predetermined integrated reference value IX0. Note that tA and tB may be set to 0 seconds in some cases, and the integrated value IX may be set to the integrated reference value IX0.
, The integrated abnormal signal SX may be output after a predetermined time has elapsed.

In the case of this embodiment, the X0 level may be, for example, poor adjustment of the secondary pressure of the gas proportional valve 32 (the gas amount is steadily insufficient compared with the supply air amount), oxygen in the installation room of the hot water supply device. It is conceivable to set the CO concentration to be caused by a decrease in the concentration, clogging of the air supply filter of the fan 22, and clogging of the fins of the heat exchanger 24. Further, the A0 level may be set to, for example, a CO concentration level caused by leakage of exhaust gas in the installation room of the water heater. Also, B0
The level may be set to a CO concentration level caused by clogging of the exhaust pipe of the water heater or exhaust gas backflow.

In the case of the water heater provided with the above-mentioned CO gas detection display system, if a combustion abnormality occurs for some reason after the burner is ignited, the concentration judging means is operated in accordance with the CO concentration increasing pattern corresponding to various causes. 3. Abnormality of combustion is determined by the integrating means 4 and the integrating determining means 5, and abnormal signals SX, SA, SB corresponding to X0, A0, B0 are output to respective reference values, and each abnormal signal is displayed on the display means 2. An abnormality display corresponding to SX, SA, SB is made, and the combustion stop operation of the device can be performed via the combustion stop means 6 by an abnormal signal of any of SX, SA, SB. In addition, each abnormal signal is stored in the storage unit 7 together with the date and time of occurrence in the order of occurrence of the abnormality. For this reason, after the combustion is stopped, it is possible to perform an optimal measure corresponding to the cause of the abnormality,
Maintenance can be made appropriate and easy.

In the case of FIG. 2, the density reference value is two levels,
Although the integration start reference value and the integration reference value are set at one level each, the density reference value may be set at one level. The setting of the density reference value, the integration start reference value, and the integration reference value may be made by one or more of the density determination means 3, the integration means 4, and the integration determination means 5, depending on the possible cause of the abnormality and the type of display required. , A plurality of reference values can be set.
In this case, the type of abnormality may be displayed on the display unit 2 based on each abnormality signal, and the combustion stopping unit 6 may stop the combustion equipment by any one of the abnormality signals.

In the above embodiment, the control of the CO gas detection and display system is controlled by the control computer 36 on the water heater side.
However, it goes without saying that a control computer dedicated to the CO gas detection display system may be used.

The CO gas detection and display system of the present invention is not limited to the above hot water supply apparatus, but can be applied to any combustion apparatus using a liquid fuel such as combustible gas or petroleum.

[0026]

According to the CO gas detection and display system of the present invention, since two types of combustion abnormality judging means are provided, a concentration judging means and an accumulation judging means, different CO concentration increasing patterns differ depending on the cause of the abnormality. , The combustion abnormality is appropriately determined. In addition, since the display means displays each abnormal state corresponding to the difference of the cause, after the combustion is stopped, it is possible to perform an optimal treatment corresponding to the cause of the abnormality, thereby improving the maintainability.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a CO gas detection and display system according to an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the elapsed time and the CO sensor detection value, showing the output timing of the abnormal signal when the concentration reference value is set at two levels, the integration start reference value and the integration reference value are set at one level. is there.

FIG. 3 is a schematic configuration diagram of a hot water supply device provided with the CO gas detection display system of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 CO sensor 2 display means 3 concentration determination means 4 integration means 5 integration determination means 6 combustion stop means 7 storage means 35 controller 36 control computer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroki Ohara 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref.

Claims (2)

[Claims] 1. A CO sensor for detecting CO in combustion exhaust gas, and comparing a detected value from the CO sensor with a predetermined concentration reference value, and detecting a concentration abnormality signal after the detected value reaches the concentration reference value. Concentration determining means for outputting; a integrating means for calculating an integrated value obtained by time-integrating a difference between the two after a detection value from the CO sensor reaches a predetermined integration start reference value; and an integrated value calculated by the integrating means. CO comprising: an integration determining means for outputting an integrated abnormal signal after reaching a predetermined integrated reference value; and a display means for displaying an abnormal state corresponding to each abnormal signal of the concentration abnormal signal and the integrated abnormal signal. Gas detection display system. 2. A plurality of reference values are set for at least one of the concentration determining means, the integrating means, and the integrating determining means, and an abnormal signal is output in accordance with each of the reference values.
2. The CO gas detection display system according to claim 1, wherein an abnormal state corresponding to each of the plurality of abnormal signals is displayed on a display unit.