WO1998002693A1 - Appareil de combustion - Google Patents

Appareil de combustion Download PDF

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Publication number
WO1998002693A1
WO1998002693A1 PCT/JP1997/002429 JP9702429W WO9802693A1 WO 1998002693 A1 WO1998002693 A1 WO 1998002693A1 JP 9702429 W JP9702429 W JP 9702429W WO 9802693 A1 WO9802693 A1 WO 9802693A1
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WO
WIPO (PCT)
Prior art keywords
carbon monoxide
concentration
combustion
exhaust gas
value
Prior art date
Application number
PCT/JP1997/002429
Other languages
English (en)
Japanese (ja)
Inventor
Naoyuki Takeshita
Toshihisa Saito
Masanori Enomoto
Masato Kondo
Toru Izumisawa
Original Assignee
Gastar Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP20664096A external-priority patent/JP3727418B2/ja
Priority claimed from JP20664196A external-priority patent/JPH1030817A/ja
Priority claimed from JP20901796A external-priority patent/JPH1038270A/ja
Priority claimed from JP21801796A external-priority patent/JP3691599B2/ja
Priority claimed from JP28641896A external-priority patent/JP3810153B2/ja
Application filed by Gastar Co., Ltd. filed Critical Gastar Co., Ltd.
Priority to EP97930779A priority Critical patent/EP0913644A1/fr
Publication of WO1998002693A1 publication Critical patent/WO1998002693A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements

Definitions

  • the present invention relates to a combustion device, and more particularly, to a combustion device that detects carbon monoxide gas (hereinafter referred to as CO) and performs a safe operation on the gas.
  • CO carbon monoxide gas
  • FIG. 1 is a diagram showing a schematic structure of a water heater generally known as a combustion device.
  • FIG. 2 is a diagram showing a use mode when the water heater is installed in a room of a building.
  • the water heater 1 sends the indoor air to the burner 4 through the filter 3 by the i'J fc of the fan 2 and burns the fuel gas supplied to the burner 4 to heat the hot water.
  • the heat exchanger 5 is heated, the water passing through the heat supply heat exchanger 5 is drained, and hot water is supplied to a place such as a kitchen through a water supply pipe connected to the outlet of the hot water supply heat exchanger 5.
  • the combustion operation of this water heater is controlled by a control unit 6: a remote controller 7 is connected to the control unit 6.
  • CO carbon monoxide gas
  • Exhaust gas is discharged outside through the chimney 10 and usually leaks into the room There is no. However, if there is a gap in the seam of the chimney 10 or it has come off, or if there is a hole in the chimney 10 due to decay or damage, etc. If the CO gas leaks into the room and the CO concentration in the indoor air reaches a level that is dangerous for the human body, there is a risk of causing CO poisoning.
  • CO poisoning occurs when hemoglobin in the blood of the human body binds to CO. Depending on the concentration of hemoglobin bound to C 0 (hereinafter referred to as blood hemoglobin CO concentration), CO poisoning occurs as shown in FIG. Causes symptoms.
  • the blood hemoglobin C0 concentration reaches a concentration that can put the human body in a dangerous state! 3 ⁇ 4] (hereinafter referred to as “danger arrival time”) is short when the CO concentration in the air is high. Reach by time. Even when the CO concentration is low, the blood hemoglobin CO concentration gradually increases due to prolonged exposure to air containing CO, and becomes dangerous after a certain period of time.
  • the graph in FIG. 4 shows the relationship between the concentration of CO in the air and the concentration of CO in the blood. According to FIG. 4, when the air CO concentration is 0.2%, if this is sucked for 2 hours, the blood hemoglobin CO concentration reaches about 64%. For this reason, conventionally, as shown in Fig.
  • a CO sensor 11 is installed on the exhaust side of the water heater 1, and when it is assumed that the exhaust gas has leaked into the room, the danger arrival time is C ⁇ The value is given in correspondence with each C0 concentration detected by the sensor 11. Then, when the time from the start of combustion reaches the danger arrival time corresponding to the CO concentration detected by the CO sensor 11, safety measures such as issuing an alarm or stopping combustion operation are taken. Had been.
  • the c ⁇ concentration in air (hereinafter referred to as indoor CO concentration), which is a reference for the dangerous arrival time, has been determined based on the CO concentration of exhaust gas discharged from combustion equipment.
  • indoor CO concentration the CO concentration in the air bleeder in the room where CO is leaking depends not only on the CO concentration in the exhaust gas but also on the combustion conditions described below.
  • the indoor CO concentration depends on the combustion capacity of the combustion equipment or exhaust gas emissions. That is, the combustion operation of the water heater 1 is performed by controlling the air flow of the fan 2 so as to match the combustion capacity, that is, to match the gas supply amount. Therefore, the amount of exhaust gas emitted per unit time (exhaust volume) differs depending on the combustion capacity.
  • exhaust volume exhaust volume
  • the danger arrival time corresponding to each C0 concentration is set on the assumption that the combustion operation is performed at the maximum combustion capacity where the danger for CO is large.
  • the combustion operation of the combustion equipment is controlled and controlled within the range of the minimum combustion capacity and the maximum combustion capacity. Therefore, for example, when the combustion operation is performed with the capacity close to the minimum combustion capacity, the danger arrival time corresponding to the CO concentration detected by the CO sensor 11 is set at the time of the IS large combustion capacity. For this reason, there was a question that even though the danger of C0 poisoning was not reached, it was determined that the danger of C ⁇ poisoning had occurred, and the combustion operation was stopped.
  • the indoor CO concentration is a value that depends on the volume inside the combustion equipment. That is, if the concentration of CO in the exhaust gas is -constantly discharged into the air, the indoor C0 concentration differs depending on the volume of the air.
  • the danger arrival time corresponding to each C0 concentration is set based on a certain room volume, and the combustion equipment is installed in a room larger than the room content ffi, there is a dangerous C Before reaching zero concentration, the set danger arrival time may be reached. In such a case, there was a problem that combustion operation was stopped even though there was no danger of CO poisoning.
  • the indoor CO concentration depends on the type of S (gas electrode) of the gas to be burned. That is, the type of gas used for the combustion operation of the water heater 1 may vary depending on the region. For this reason, usually, the water heater 1 is provided with a gas type switch (not shown), At the time of shipment, the gas type switching switch is operated to select the gas type of the destination, and the combustion capacity of the water heater 1 is adjusted according to the gas type.
  • a gas type switch not shown
  • the gas type switching switch is operated to select the gas type of the destination, and the combustion capacity of the water heater 1 is adjusted according to the gas type.
  • differences in gas types have not been taken into account in performing CO safe operation. The present inventor examined the difference in gas types in performing the C0 safe operation, and found that the reliability of the C0 safe operation was greatly affected by the gas type.
  • the indoor CO concentration is a value that depends on the structure of the supply / exhaust pipe of the combustion equipment, that is, whether it is a double pipe structure or a double pipe structure.
  • the double pipe structure and the double tube structure will be described.
  • FIGS. 5 and 6 are schematic diagrams of a combustion device having a two-pipe structure and a --main pipe structure supply / exhaust structure, respectively.
  • an air supply pipe 401 and an exhaust pipe 402 are provided in a tubular shape for exhaust, and an adab 403 is fixed to the tip side of the pipe for the air supply and exhaust.
  • a different type of air supply / exhaust unit 404 is connected to this adapter 403.
  • the equipment shown in Fig. 5 is an air supply / exhaust unit 404 in which the air supply pipe 401 and the exhaust pipe 402 are formed in a two-tube shape. 4 0 1 and 2 are guided to the outside, for example, behind the roof of a creature.
  • the water supply / exhaust unit 404 of the water heater shown in FIG. 6 has a double pipe supply / exhaust structure in which an air supply pipe 401 and an exhaust pipe 402 are separately formed. Whether these water supply / exhaust structures are of a single-pipe air supply / exhaust structure or of a two-pipe air supply / exhaust structure is determined by the conditions of the hot water heater installation site. In the water heaters shown in Figs. 5 and 6, an adapter 40 is provided on the fixture side so as to be able to cope with either of the air supply and exhaust structures.
  • the unit 404 and the supply / exhaust unit 404 of the double pipe supply / exhaust structure can be detachably mounted. In the water heaters shown in FIGS.
  • the rotation of the fan 405 sends external air to the burner 406 via the air supply pipe 401, and the burner passes through the gas pipe 407.
  • the fuel gas supplied to 406 is burned to heat the hot water supply heat exchanger 408, and the water supply pipe 4
  • the water supplied to the hot water supply heat exchanger 4 08 from 10 is turned into hot water, and the hot water is supplied to a desired place such as a kitchen via a hot water supply pipe 4 1 1 connected to the outlet side of the hot water supply heat exchanger 4 08. It is to do.
  • the combustion operation of the water heater is performed by a control device 4 12, and a remote control 4 13 is connected to the control device 4 12.
  • 414 is a gas solenoid valve that opens and closes the passage of the gas pipe 407
  • 415 is a proportional valve that controls the gas supply by opening a
  • 416 is the CO of exhaust gas.
  • Each of the C0 sensors for detecting the concentration is shown.
  • the present inventor believes that due to the difference between the two-tube supply / exhaust structure and the two-tube supply / exhaust structure, the exhaust gas may be cleaved or separated at the joint of the exhaust 402 (the intake pipe 401 ).
  • the intake pipe 401 The situation of C ⁇ contamination in the room when it leaked into the room from a defective part such as a pipe connected outside was determined by experiments. Examples of the results are shown in FIG. 7 and FIG. Fig. 7 shows a case where the supply / exhaust structure is a dual pipe supply / exhaust structure. If exhaust gas leaks from the exhaust pipe 2 of this dual pipe supply / exhaust structure into the room, the supply air 401 is also the exhaust pipe 402. It is probable that a leak occurred due to damage in the same place as above.
  • the indoor air is supplied to the burner 406 through the air supply pipe 401. That is, as the exhaust gas leaks into the room, the oxygen concentration in the room decreases, and the oxygen-deficient air is supplied and supplied to the burner 406 side. Therefore, the combustion becomes incomplete combustion, and the oxygen concentration in the room sharply decreases with time. Along with this, the combustion state deteriorates further due to the lack of oxygen in the air supplied to the burner 406 side, the generation of CO gas increases, and the indoor CO contamination rapidly progresses.
  • FIG. 7 shows the temporal change of the oxygen concentration in the room
  • FIG. 7 shows the temporal change in the CO concentration in the exhaust gas
  • FIG. 7 shows the temporal change in the indoor CO concentration. It illustrates the change.
  • the solid line in this figure indicates the case where the combustion capacity is 40,000 Kcal / h
  • the broken line indicates the case where the combustion capacity is 30,000 Kcal / h
  • the dashed line indicates the case where the combustion capacity is 10,000 Kcal / h. I have.
  • the greater the combustion capacity the greater the rate of decrease in the oxygen concentration in the room.
  • the higher the combustion capacity the lower the oxygen concentration of the air supplied to the PANA 406, so that the rise of the exhaust CO concentration becomes faster than when the combustion capacity is low.
  • the higher the combustion capacity the more the unit of exhaust gas As a result, the flow rate per hour increases and a large amount of exhaust gas is introduced into the room. As a result, the indoor C0 concentration increases as the combustion capacity increases.
  • the supply / exhaust structure is a double pipe supply / exhaust structure
  • the exhaust pipe 401 and the supply pipe 402 are separate and independent, so the exhaust pipe 401 and the supply pipe 402 At the same time, it is unlikely that the gas will be damaged from the location. Even if the exhaust gas leaks from the defective part of the exhaust pipe 401 into the room, the outside of the exhaust pipe 402 is clean from the outside. As a result, the air continues to be supplied to the parner 406, and as shown in FIG. 8 (a), the CO concentration of the exhaust gas is generated at a substantially constant concentration. The CO generation mechanism is completely different from the case.
  • the two cases of ffi pipe supply and exhaust structure as described above, the oxygen in the room by the exhaust gas leaks into the room (0 2) lack of concentration indoor CO: greatly affect dyeing, the indoor 0 2 concentration Because the combustion capacity is directly affected by the combustion capacity, it is preferable to evaluate the degree of indoor CO pollution in consideration of the combustion capacity.
  • ER value (Each Rate) is obtained from the CO concentration in the exhaust gas detected by the CO sensor, and a TR value (Total Rate), which is a sum of the ER values, is obtained.
  • TR value Total Rate
  • the ER value is defined as the blood hemoglobin C 0 concentration when the human body is exposed to air containing the predetermined air C 0 concentration detected during a certain unit time t. Is defined as t / T, given the time T required for a substance to reach a predetermined concentration (eg, 25%) that poses a risk to the human body. Normally, the concentration of CO in the air changes over time, so by calculating the ratio of the unit time t to the time T corresponding to the CO concentration, a weight value is obtained for each position time question. be able to. Then, the value obtained by calculating the ER value is the TR value, and when the TR value becomes 1, it means that the hemoglobin C0 concentration in the blood has reached the predetermined dangerous concentration.
  • the predetermined hazard concentration may be set low, for example, 10%, in order to prevent the generation of C poisoning, depending on the environment where the combustion equipment is installed. Is set, and the corresponding ER value is determined.
  • FIG. 9 shows a conventional ER value table corresponding to the C0 concentration of exhaust gas.
  • the table is stored in a storage means such as a ROM in a control means such as a microcomputer of the combustion equipment.
  • the ER value shown in Fig. 9 is multiplied by 250 for microcomputer program reasons.
  • the concentration of CO in the air depends not only on the CO concentration of the exhaust gas that is emitted, but also on the exhaust ft of the exhaust gas. For example, in the maximum operation and the minimum operation of combustion, even if the CO concentration in the exhaust gas is the same, if the exhaust gas amount differs, the amount of C0 discharged into the air, that is, almost The air CO concentration under a certain volume is different.
  • the CO concentration in the air depends on the volume of a space, such as a room in a room, that is adjacent to the exhaust passage and from which exhaust gas may leak from the exhaust passage. That is, for example, when a constant amount of CO is discharged into a space having a constant volume over time, the C 0 concentration varies depending on the volume of the space.
  • the ER value was calculated only from the CO concentration of the exhaust gas.
  • the time required for the concentration of blood hemoglobin CO to reach a predetermined concentration (for example, 25%) or more was sometimes different.
  • a predetermined concentration for example, 25%
  • the amount of exhaust gas emitted is relatively small, and the amount of emitted CO is also relatively small, so that before the CO concentration in the blood reaches the predetermined concentration, TR value reaches 1.
  • the TR value reaches 1 before the CO concentration in the blood reaches the predetermined concentration. That is, before the hemoglobin CO concentration in the blood reaches the predetermined concentration, safety measures may be activated and combustion may stop. Therefore, when monitoring C0 concentration by ER value, it is more efficient to use ER ⁇ that takes into account the exhaust S of exhaust gas and also the volume of the air gap where CO gas is emitted. This is preferable for monitoring the concentration.
  • the present invention has been made to solve the above-described problems, and has as its object the purpose of adding the C ⁇ concentration of the exhaust gas detected by the C0 sensor, the state of the combustion operation of the combustion device, and the installation of the combustion device.
  • the room volume, the type of combustion gas, and the air temperature are determined in accordance with the supply and exhaust structure of the combustion equipment, to determine a more accurate danger arrival time, and to judge the risk of CO poisoning at an appropriate time in a positive m. It is an object of the present invention to provide a combustion device that performs c0 safety operation with high accuracy.
  • Another object of the present invention is to use not only the c0 concentration in the exhaust gas, but also the ER value in consideration of the displacement of the exhaust gas and / or the volume of the air gap from which the C0 gas is discharged. It is to provide combustion equipment that performs accurate C ⁇ safe operation.
  • a first aspect of the present invention for achieving the above object is a combustion device that includes a C0 sensor that detects a CO concentration in exhaust gas and performs a CO safe operation based on the CO concentration detected by the CO sensor.
  • This is a combustion device characterized by having a control means for determining a timing of a CO safe operation based on a CO concentration detected by a sensor and a combustion capacity of the combustion device or an exhaust gas amount.
  • the CO concentration in the exhaust gas is detected by the CO sensor on the exhaust side. Then, the combustion capacity or the displacement of the combustion equipment in the combustion operation state is detected, and the combustion operation time is detected by the CO sensor.
  • C0 C0 safety operation such as combustion operation stop is performed by the safety operation.
  • the danger arrival time at which the person in the room is estimated to reach the danger of CO poisoning is determined not only by the CO concentration but also by the CO concentration.
  • CO safety operation is performed. Therefore, compared with the case where the continuous combustion time is set only by the CO concentration, the time when the danger of CO poisoning is reached can be determined accurately by considering the operating state of the combustion equipment such as the combustion capacity. It is possible to perform a safe CO operation.
  • a second aspect of the present invention for achieving the above object is a combustion device that includes a CO sensor that detects a CO concentration in exhaust gas and performs a C0 safe operation based on the CO concentration emitted by the CO sensor.
  • a combustion device characterized by including a control means for determining a timing of a CO safe operation based on a C 0 concentration detected by the C 0 sensor and a volume in a chamber from which exhaust gas is discharged. .
  • an estimated value of the indoor C0 concentration is obtained based on the information on the C ⁇ concentration in the exhaust gas detected by the CO sensor and the volume of the room where the exhaust gas is assumed to leak. Can be Then, when the obtained value reaches a predetermined danger judgment reference value, a safe operation for converting to C0 gas is performed, so that a highly reliable C0 safe operation is possible.
  • the third finding to achieve the above object is a combustion device that has a C0 sensor that detects the CO concentration in exhaust gas and performs a CO safe operation based on the CO concentration detected by the CO sensor.
  • a combustion apparatus characterized by having control means for determining the timing of the CO safety operation based on the CO concentration detected by the CO sensor and the type of fuel gas.
  • the CO concentration in the exhaust gas is detected by the CO sensor.
  • the CO safety operation performs a CO safety operation such as stopping the combustion operation.
  • the danger arrival time at which a person is estimated to reach the danger state of CO poisoning is given not only by the CO concentration but also by considering the gas type, so the danger arrival time is set only by the C0 concentration
  • the danger arrival time is set only by the C0 concentration
  • a fourth aspect of the present invention to achieve the above object is a combustion device that includes a CO sensor that detects a CO concentration in exhaust gas and performs a CO safety operation based on the CO concentration detected by the CO sensor.
  • a combustion device characterized by having control means for determining the timing of a CO safe operation based on the C0 concentration detected by the 0 sensor and the type of structure of the supply / exhaust pipe of the combustion device.
  • the structure of the supply / exhaust pipe attached to the exhaust 51 side of the combustion equipment at the time of shipment of the combustion equipment or at the time of installation of the combustion equipment namely, a double pipe structure and a double pipe structure.
  • the danger arrival time at which the corresponding C0 safe operation is performed is given.
  • the combustion operation time reaches a danger that corresponds to the C0 concentration detected by the C ⁇ sensor and the structure of the supply and exhaust pipes, the C0 safety operation such as combustion operation ⁇ 11: is performed. It is. Therefore, CO safe operation will be performed in accordance with the actual situation of the 3 ⁇ 4P air supply and exhaust structure of the combustion equipment, and the reliability of the CO Annex will be improved.
  • the fifth invention which achieves the above object is a method wherein the detection is performed at every predetermined order time t.
  • the ER value obtained by the ratio t / T to the time T at which the moglobin CO concentration reaches the dangerous reference concentration when blood is released in an atmosphere of CO concentration is set, and the TR value, which is the integrated value of the ERii, is set.
  • a combustion device having means for detecting an abnormal state of the combustion device when a predetermined standard is met, wherein the ER value is a CO concentration of exhaust gas of the combustion device, and an exhaust gas amount of the combustion device.
  • the combustion apparatus is set in accordance with Z and Z or the volume of a space from which exhaust gas is discharged.
  • the ER value is determined in consideration of not only the CO concentration in the exhaust gas, but also the exhaust gas amount and / or the space from which the exhaust gas is discharged. Accurate ER values can be obtained according to actual conditions, and more accurate and reliable combustion equipment that performs CO safe operation is provided.
  • FIG. 1 is an explanatory diagram of a configuration of an indoor-installed type water heater generally known as a combustion device.
  • FIG. 2 is an explanatory diagram of an example of indoor installation of a combustion device.
  • FIG. 3 is a chart showing the relationship between blood hemoglobin C0 concentration and human symptoms.
  • FIG. 4 is a graph showing the relationship between the concentration of C ⁇ in the air and the concentration of C0 in hemoglobin.
  • FIG. 5 is an explanatory view of a configuration of a water heater having a double water supply / drainage five structure.
  • FIG. 7 is an explanatory diagram of the state of indoor C0 contamination in a case where exhaust gas from a double-pipe water supply air heater has leaked into a room.
  • FIG. 8 is an explanatory diagram of the state of C0 contamination in a room in a case where exhaust gas of a hot water supply unit having a double water supply / drainage structure leaks into a room.
  • FIG. 9 is an example of a conventional ER value table corresponding to C 0 ⁇ of exhaust gas.
  • FIG. 10 is a control function block diagram of a control means of a combustion device which performs a C 0 safe operation in one embodiment of the present invention.
  • FIG. 11 is an explanatory view showing a combustion device of a hot water supply / combiner.
  • FIG. 12 is an explanatory diagram of data in which the relationship between the CO concentration of exhaust gas and the dangerous arrival time at which the indoor CO degree reaches the dangerous state of CO poisoning is divided for each combustion capacity.
  • FIG. 13 is an explanatory diagram of a configuration in which the combustion control section 23 supplies a ⁇ valve drive current to the proportional valve 22 to control the combustion capacity.
  • Fig. 14 is an explanatory diagram of data obtained by dividing the relationship between the CO concentration of exhaust gas and the dangerous arrival time at which the indoor CO concentration reaches the dangerous state of CO poisoning for each fan airflow.
  • FIG. 15 is a control function block diagram of control means of a combustion device for performing a CO safe operation in the first third embodiment of the present invention.
  • FIG. 16 is an explanatory view of a multi-stage combustion surface switching type wrench.
  • FIG. 17 is a control function block diagram of control means of a combustion device that performs a C ⁇ safe operation in the second embodiment of the present invention.
  • FIG. 18 is an indoor model diagram for deriving an arithmetic expression for calculating the indoor CO concentration.
  • FIG. 19 is a control function block diagram of control means of a combustion device for performing a CO safe operation according to the second embodiment of the present invention.
  • Fig. 20 is data showing the relationship between the CO concentration in exhaust gas and the time T required for the indoor CO concentration to reach the danger criterion value when it is assumed that exhaust gas of that CO2 level leaked into the room. is there.
  • FIG. 21 is a control function block diagram of control means of a combustion device which performs a CO safe operation according to the third embodiment of the present invention.
  • 22 (1) is an explanatory diagram of data obtained by dividing the relationship between the CO concentration of the exhaust gas and the dangerous arrival time at which the indoor CO concentration reaches the dangerous state of CO poisoning for each rare gas.
  • Twenty-fourth 24I is a control of a combustion device that performs a CO safety act in the fourth embodiment of the present invention. It is a control function block diagram of a means.
  • Fig. 25 is a graph showing examples of CO safe operation start condition data used when the supply / exhaust structure is a pipe supply / exhaust structure.
  • Fig. 26te! Is a graph showing an example of CO safety operation start condition data used when the exhaust structure is--the mains supply / exhaust structure.
  • FIG. 27 is an explanatory diagram of an example in which a valve-opening drive current to a comparison valve is used as combustion performance information.
  • FIG. 28 is a control function block diagram of control means of a combustion device for performing a CO safety act according to the fourth and second embodiments of the present invention.
  • FIG. 29 is an explanatory diagram of a water heater of a forced air supply type of combustion air in which a fan is provided below a parner.
  • FIG. 30 is a diagram showing a configuration of a combustion apparatus according to a fifth embodiment of the present invention.
  • FIG. 31 is a flowchart of the CO concentration monitoring control according to the fifth embodiment of the present invention.
  • Fig. 32 is an example of a table of ER values corresponding to the CO concentration of exhaust gas and the number of rotations of the fan.
  • Fig. 33 shows an example of a table of ER values corresponding to the CO concentration of exhaust gas and the volume of the space from which exhaust gas is exhausted.
  • FIG. 34 is an example of a table of ER values corresponding to the CO concentration of the exhaust gas and the number of rotations of the fan, which are determined for each volume of each space from which the exhaust gas is discharged.
  • combustion equipment of the present embodiment described below is not limited to the hot water supply single function device shown in FIG. 1, but includes, for example, a hot water supply / bath combined device, and further, a heating device, a cooling device, a heating and cooling device, etc. It may be an internal combustion device or the like.
  • Exhaust gas from the combustion equipment is discharged outside (outdoors) via the chimney (duct) 10 in FIG.
  • the air supplied for combustion can take various forms, such as an evening air that takes in indoor air or a type that takes in outside air. It is applicable to all types of indoor installation type combustion equipment, regardless of the type or type.
  • the CO safety operation takes into account the combustion capacity or exhaust volume, the room volume, the type of combustion gas, and the structure of the supply and exhaust pipes Will be described below. Further, the CO safe operation is executed by control means of the combustion equipment such as the control device 6 described above.
  • control means is realized by a microcomputer, the control functions described below are realized by software.
  • FIG. 10 is a control function block diagram of a control unit of a combustion device that performs a CO safety operation according to the first embodiment.
  • the control means has a memory 111, a combustion time measuring means 113, and a CO safe operation part 114.
  • the hot water supply / bath combined unit shown in Fig. 11 is a hot water supply that heats and heats the hot water supply heat exchanger 5.
  • the outgoing pipes 16 and 17 connected to the additional heat exchanger 15 are connected to a bath tub (not shown), and a circulation pump 18 is driven to circulate the bath tub water. Hot water is heated by the combustion heat of the Pana 4 b when passing through the reheater 15, and reheating is performed.
  • the operation of the heat supply heat exchanger 5 is the same as the operation of the water heater of FIG. 1, and the same components are denoted by the same reference numerals.
  • data as shown in] 12 is given to the data memory 112.
  • the horizontal axis of the graph in FIG. 12 indicates the CO concentration of the exhaust gas, and the vertical axis indicates the reference value for the dangerous state of C0 poisoning when the exhaust gas leaks into the room and the indoor C0 concentration is C0 poisoning.
  • Curve A in the graph shows the operating condition when the combustion capacity of the combustion equipment is 40,000 Kcal / h
  • curve B shows the operation when the combustion capacity is 29500 Kcal / h
  • curve C shows the operation when the combustion capacity is 19500 Kcal / h.
  • the llii line D indicates the combustion state of the burner of the hot water / bath combined unit as shown in FIG. 11 at a burning capacity of 10,000 Kcal / h of the burner 4b.
  • ⁇ Even when the CO concentration in the gas is the same, the time required for the indoor CO concentration to reach the dangerous judgment * standard value of 300 ppm is different.
  • the danger criterion value for indoor CO concentration is set to 300 ppm, and when it is assumed that exhaust gas of each CO concentration has leaked into the room, the danger arrival time when the indoor C0 concentration reaches the danger determination criterion value is assumed.
  • the data is stored in the data memory 1 1 2 according to the combustion capacity of the combustion equipment. It should be noted that the data indicating the relationship between the exhaust C0 concentration and the danger arrival time can be given not only from the graph data, but also from the table data, arithmetic expression data, and the like.
  • the CO safe operation section 114 acquires the detection information of the C ⁇ concentration of the exhaust gas from the CO sensor 11 and also acquires the combustion capacity information. This combustion capacity information is obtained from the combustion control unit in the control device 6.
  • the gas passage 20 of the wrench 4 is provided with a solenoid valve 21 for closing and closing the gas passage and a proportional valve 22 for controlling the gas supply amount based on the opening amount.
  • the opening amount of the proportional valve 22 is controlled by the combustion control unit 23. That is, for example, during the combustion operation of the water heater 1, the combustion control section 23 is connected to the outlet side of the hot water supply heat exchanger 5.
  • the combustion capacity is calculated by calculation so that the temperature becomes the set temperature set by the remote controller 7, and the magnitude of the valve-opening drive current applied to the proportional valve 22 is controlled so as to obtain this combustion capacity.
  • the magnitude of the valve-opening drive current applied from the combustion control unit 23 to the proportional valve 22 corresponds to the magnitude of the related valve amount of the proportional valve 22, in other words, the magnitude of the gas supply amount.
  • detection data of the valve-opening drive current is obtained as the combustion performance information. Based on this combustion capacity report and the information on the CO concentration in the exhaust gas input from the CO sensor 11, the data stored in the data memory 112 is shown in FIG. The danger arrival time T at which the CO ffi degree becomes the danger judgment reference value is acquired.
  • the danger arrival time T corresponding to the exhaust C 0 concentration is given separately for each combustion capacity, and the combustion capacity information and the CO sensor 11 detect the danger arrival time T.
  • the appropriate danger arrival time T corresponding to the information on the exhaust C0 concentration can be obtained. As a result, it is possible to significantly improve the accuracy of the CO safe operation, and to prevent a malfunction in which the combustion is stopped even though the indoor CO concentration does not reach the dangerous concentration.
  • the data of the valve drive current to the proportional valve 22 is used as the combustion capacity ⁇ ⁇ .
  • the data of the gas supply amount and the data of the combustion control unit 23 are used instead. Similar results can be obtained when the calculated value of the combustion capacity is calculated.
  • a gas flow sensor or the like is provided in the gas supply passage 20, and a detection signal of the gas supply by this sensor is used as the CO safety operation unit 1 Entered in 1 4
  • the first and second embodiments are characterized in that the C0 safe operation is performed using the air volume data of the fan corresponding to the displacement in place of the combustion capacity in the first embodiment.
  • the rest is the same as in the first embodiment.
  • the combustion operation is performed by supplying a fan airflow corresponding to the combustion capacity, the combustion capacity and the exhaust quantity, that is, the fan capacity, are increased.
  • fan airflow data is used instead of combustion capacity.
  • the relationship between the exhaust CO concentration and the danger arrival time T is given to each fan wind a in Fig. 10 in the data memory 112 as shown in Fig. 14. ing.
  • Curve E shown in Fig. 14 is a time chart when the rotation speed (rotation speed) of fan 2 is 6000 rpm, and curve F is an operation condition when fan rotation speed (rotation speed) is 550 (h'pm).
  • the curve G shows the operating state when the fan rotation speed (rotational speed) is 5000 ⁇ ⁇ ⁇ , and thus the data showing the relationship between the exhaust C ⁇ concentration and the danger time.
  • the data is provided separately for each fan airflow, and such data is stored in the data memory 112 in an appropriate form such as graph data, table data, and arithmetic expression data.
  • the fan capacity information is taken into the C0 safe operation section 114 as indicated by the broken line of I: 110. If the fan wind information is low, a fan rotation detection sensor 24 such as a hall IC that protrudes the fan Lnjfe of the fan 2 is provided as shown in Fig. 1 and I] 11 and the fan rotation detection sensor 24 The rotation detection report is added to the C0 safety operation section 1 14 as data.
  • a fan rotation detection sensor 24 such as a hall IC that protrudes the fan Lnjfe of the fan 2 is provided as shown in Fig. 1 and I] 11 and the fan rotation detection sensor 24
  • the rotation detection report is added to the C0 safety operation section 1 14 as data.
  • the CO safety operation 114 captures the CO concentration of the exhaust gas from the CO sensor 11 and the information of the fan airflow from the fan rotation detection sensor 24, As shown in Fig. 14 obtained in the evening memory 1 1 and 2, the danger arrival time ⁇ , ⁇ , which is related to the fan airflow and the C0 concentration in the exhaust gas, was obtained from the data, and the combustion time was measured. Using the means 113, when the combustion time from the start of combustion reaches this danger arrival time ⁇ , safety operations such as stopping the combustion operation are performed.
  • the information from the CO sensor 11 and the information on the fan air volume corresponding to the exhaust gas are acquired and the C0 safe operation is performed.
  • the appropriate danger arrival time T corresponding to the operating state of the combustion equipment highly accurate CO safe operation becomes possible, and the same effects as those of the first embodiment can be obtained.
  • the fan air volume is used as the fan air volume, but the fan air volume is used as the air volume.
  • the fan air volume is used as the air volume. Is provided with an air flow sensor and a wind speed sensor for indirect detection. -Evening can be used as fan airflow data.
  • the fan drive power can also be used as fan air volume data.
  • FIG. 15 shows a block configuration of the first to third embodiments of the present invention.
  • the control means in the present embodiment includes a CO concentration sampling section 125 of exhaust gas, a tsp / T calculation integration section 127, a clock mechanism 126, a data memory 112, and a CO safety operation. Parts 114.
  • the C ⁇ concentration sampling unit 125 samples the C 0 concentration C ext in the exhaust gas from the C 0 sensor 11 after the start of combustion in units of a predetermined unit sampling time t sp. Specifically, the sampling time is set to, for example, 10 seconds, and the CO concentration sampling unit 125 obtains the detection information of the CO sensor 11 every second, finds the average detector, and obtains the average reconnaissance. Determine the value of the CO concentration in the exhaust gas in question. The timing of this sampling is performed based on iS- of the clock mechanism 126 configured by a timer, a clock, and the like.
  • the data memory 112 has a relationship between the dangerous arrival time T and the C 0 concentration C ext in the exhaust gas divided for each combustion capacity as shown in ⁇ 12 as in the first embodiment. Data is given.
  • the t sp / T calculation integration unit 127 obtains the value of the C ⁇ concentration in the exhaust gas detected in units of the unit sampling time t sp input from the CO concentration sampling unit 125, and Calculate the value of T.
  • the selection is made based on the combustion capacity information taken in the same manner as in the first embodiment. For example, when the combustion capacity information indicates 29500 Kcal / h, the data of curve B is selected and the danger arrival time T is calculated based on this data.
  • the danger arrival time T is, as described above, the danger criterion value of the indoor CO concentration of 300 ppm, for example, assuming that the exhaust gas with the C 0 concentration C ext detected by the CO sensor 11 has leaked into the room. It is time to reach C th.
  • the ratio of the sampling time t sp to the time T is determined.
  • This value of t sp / T is the safe time T This means that the ratio of t sp / T is spent, leaving only the safe ratio (1— t sp / T).
  • tsp is spent, and the remaining safety time is neglected because only T-tsp is left. I do.
  • the t sp / T calculation integration unit 127 calculates t sp / T at the first sampling time of S, and also at the next sampling time, the t sp / T calculated by the detection of CO concentration in exhaust gas. / T! ? Put out. Then, the calculated value is added to t sp / T obtained at the time of the previous sampling to obtain an integrated value ⁇ :. In this way, the t sp / T calculation / integration unit 127 successively integrates the value of t sp / T obtained at each sampling time t sp at each sampling time.
  • t sp / T 1 is determined by T 1 for the exhaust CO concentration C extl at the first sampling
  • t sp / T 1 is determined by T 2 for the exhaust 5 C 0 concentration C ext2 at the next sampling.
  • T 2 is determined, and the value of t sp / T 1 + t sp / T 2 is determined as
  • the accumulated ffi is t sp (1 / T 1 + 1 / T 2 + 1 / ⁇ 3)
  • the t sp / T calculation integration unit 127 integrates the value of t sp / T obtained at each sampling time, and gives the result to the CO safe operation unit 114.
  • the CO safety operation unit 114 monitors the integration result given from the tsp / T calculation integration unit 127, and when the integration 1 ⁇ 2 reaches a predetermined set value, for example, 1.0, the indoor CO concentration C room Judgment is made that the set danger criterion ftSC th has been reached, and the CO safety operation such as shutting off gas to the Pana 4 is performed.
  • a predetermined set value for example, 1.0
  • the combustion capacity at the first sampling time is the capacity of curve A in Fig. 12, and the second sampling time
  • the value of tsp / T was calculated using the data of curve A at the time of the first sampling, when it changed to the capability of curve B at the time of the third sampling, and at the time of the third sampling.
  • the value of t sp / T is obtained using the curve B
  • the value of t sp / T is obtained using the data of the curve C. It is.
  • t sp / T is calculated using the combustion capacity data corresponding to the change in the combustion capacity. / T is integrated, and when the integrated value becomes 1, the CO safety operation is performed.
  • data on the relationship between the exhaust CO concentration and the dangerous arrival time T corresponding to the combustion capacity of the combustion equipment in the combustion operation state is selected, and based on the data based on these combustion capacities.
  • ts / T is calculated for each sampling time and integrated one after another. Therefore, it is possible to accurately determine the danger arrival time at which the indoor CO concentration reaches the danger criterion value in consideration of the change in the combustion capacity of the combustion operation, thereby improving the accuracy of the CO safe operation. You can increase it.
  • the exhaust gas CO is divided into the data memory 111 of FIG. Stores the correlation data between the concentration and the danger arrival time T.
  • fan air volume information is added in place of the combustion capacity information in the same manner as in the first embodiment.
  • the other configuration is the same as that of the first embodiment.
  • the detected value of the exhaust C ⁇ concentration from the C 0 sensor 11 is sampled by the C 0 concentration sampling unit 125.
  • the sampling value is subjected to arithmetic processing by the tsp / T calculation integration section 127, and the tsp / T output integration section 127 calculates various data shown in FIG. 14 based on the fan air volume information. Among them, the data corresponding to the fan air volume information to be manually input is selected.
  • the CO safe operation unit 114 when the fan air volume information is GOOOrpm, the data of the curve E is selected and the danger arrival time T corresponding to the exhaust C0 concentration is obtained, and as in the third embodiment, t sp / The calculation of T and the accumulation of the values of t sp / T at each sampling time are performed, and when the integrated value reaches 1, the CO safe operation is performed by the CO safe operation unit 114.
  • the present invention is not limited to the above embodiments, and various embodiments can be adopted.
  • the burner 4 (4 a, 4 b) is assumed to be burnt in the plane, but the burning surface of the burner 4 is duplicated so as to reduce the size of the burner to 16.
  • a multi-stage combustion type may be used. This exfoliating burner type burner divides fij into multiple stages (two stages in Fig. 16) and switches solenoid valves 2 la and 21 b to burn the A side according to the required combustion capacity. Or to burn the A side and ⁇ ⁇ at the same time.
  • the method of performing the C 0 safe operation using the fan air volume information provides particularly desirable results.
  • the standard value for determining the risk of C0 poisoning in a room is defined by the CO concentration in the room, but in addition to that, the amount of CO taken into the blood hemoglobin of a person is also specified. It may be defined by the amount, that is, the value of blood hemoglobin CO concentration.
  • the danger criterion value for example, 10%
  • a dangerous state of CO poisoning occurs, and the blood hemoglobin CO concentration reaches the danger criterion value.
  • t for each combustion capacity is divided for each exhaust gas amount, that is, fan air flow, and a correlation data of the danger arrival time T corresponding to each exhaust CO concentration is created and stored in the data memory 112. Just give it.
  • correlation data between the exhaust CO concentration and the dangerous arrival time T was obtained for each combustion capacity.
  • a correlation may be given for only one representative combustion capacity.
  • the danger arrival time ⁇ for other combustion capabilities can be obtained by multiplying the danger arrival time ⁇ obtained using the representative correlation by the supplementary iH coefficient given.
  • the correction coefficient corresponds to the difference between the representative combustion capacity and the combustion capacity in the actual operating state (input combustion capacity report).-The correction coefficient is given as a value corresponding to the a or ratio of exhaust a per unit time. I just need.
  • the correlation data of the exhaust gas CO concentration and the dangerous time T may be given only for one representative fan airflow.
  • the danger arrival time T for the exhaust CO concentration of the other fan airflow is obtained by multiplying the danger arrival time ⁇ obtained based on the correlation of the representative fan airflow by a correction coefficient given in advance.
  • This correction coefficient may also be given as a depression according to the difference or ratio of the exhaust air volume per unit time corresponding to the difference between the representative fan air volume and the fan air volume in the actual operating state (input fan air volume information).
  • FIG. 17 is a control function block diagram of control means of a combustion device for performing a CO safe operation in the second embodiment.
  • the control means has an indoor CO concentration estimation calculating section 2 12, a combustion time measuring section 2 13, and a CO safe operation section 2 14.
  • the indoor CO concentration estimation calculation unit 2 12 calculates the indoor CO concentration based on the information on the CO concentration in the exhaust gas detected by the CO sensor 11 assuming that the entire amount of the exhaust gas has leaked into the room. Include the combustion time of the combustion equipment and the volume of the room in the parameters It is determined by an arithmetic expression given in advance.
  • This arithmetic expression is given by the following (1), and this arithmetic expression is stored in advance in a memory or the like inside the arithmetic unit 212.
  • C room (Q 3 XC ext / n V) ⁇ 1 -exp (-nt) ⁇ (1)
  • C room is the indoor CO concentration (ppm)
  • Q 3 is the total exhaust gas amount (m 3 / h )
  • X is the ratio of the amount of exhaust gas leaking into the room out of the total amount of exhaust gas (total amount)
  • C ext is the CO concentration (ppm) in the exhaust gas
  • n is the ventilation rate with a ventilation fan, etc.
  • V is the volume of the room (m 3 )
  • t indicates the combustion time.
  • Fig. 18 shows a model of the room for the calculation of equation (1).
  • reference numeral 215 denotes an air intake pipe for introducing air from outside to the combustion equipment
  • reference numeral 216 denotes a defective portion 216 generated in the middle of the chimney 210. This shows a state in which the exhaust gas leaks from the defective portion 2 16 into the room.
  • C ext is detected by the CO sensor 11 as the concentration of C ⁇ in the exhaust gas. Further, the combustion time t is measured by a combustion time measuring means 2 13 such as a clock or a clock, and is obtained as a known value.
  • the indoor CO concentration estimation calculation section 2 1 2 acquires information on the CO concentration in the exhaust gas detected from the CO sensor 1 1 and the value of the combustion time t measured by the combustion time measuring means 2 1 3, Calculate the indoor CO concentration C room when it is assumed that the exhaust gas has leaked into the room. In this calculation, assuming safety, and assuming that all the exhaust gas leaked into the room, the indoor CO concentration C room was calculated under the condition of X-1.0, and the calculation result was the CO safe operation unit 2. Given to 14.
  • the CO safety operation section 214 preliminarily contains the dangerous value C th for indoor CO concentration O 98/02693
  • the CO safe operation unit 2 14 uses this danger judgment reference value C th and the indoor CO concentration estimation calculation unit 2 12-! Compare the output value C room with the room C 0 concentration. When the value of the room C room reaches the danger criterion value C th, shut off the fuel to the burner (cut off the valve provided in the gas passage to supply to the parner). And other safe actions against CO.
  • the exhaust gas C 0 concentration sampling unit 2 17 samples the C 0 concentration C ext of the exhaust gas blown from the C ⁇ sensor 11 after the start of combustion in units of a predetermined sampling time t sp given in advance. Specifically, the CO concentration sampling unit 217 sets the sampling time to, for example, 10 seconds, acquires the detection information of the CO sensor 211 every second, obtains the average value, and obtains the unit sampling. Determined as the value of CO concentration in exhaust gas per hour. This sampling is performed based on a signal of a clock mechanism 220 constituted by a timer, a clock, and the like.
  • the data memory 221 provides a data relationship between the time T and the CO concentration C ext in the exhaust gas as shown in FIG.
  • the time T on the vertical axis of this data indicates the time required for the indoor CO concentration C room to reach the predetermined danger criterion value C th when the exhaust gas with the C 0 concentration C ext leaks into the room. I have.
  • the dangerous judgment reference value C th for example, 300 ppm
  • the C 0 concentration of C ext2 is shown.
  • the indoor CO The degree C room indicates that the danger criterion value C th is reached.
  • the graph shown in FIG. 20 is obtained by calculation or experiment.
  • t is obtained by substituting C th into the value of C room and substituting C extl into the value of C ext to obtain t using the equation (1). 1 is required.
  • t T 2 is obtained by substituting C ext2 in addition to C ext. In this way, when it is assumed that exhaust gas with a certain CO concentration leaks into the room, the time T when the room C 0 concentration C room reaches the danger criterion ⁇ C th is obtained.
  • the data of FIG. 20 is obtained.
  • a C0 sensor should be provided separately in the room.
  • the C Measure the risk T 1 when changing to the danger criterion value C th This operation is performed by measuring the time T corresponding to each temperature while changing the CO concentration of the exhaust gas, and similarly, data as shown in FIG. 20 is obtained. 2 Stored in 1.
  • the t sp / ⁇ calculation integration unit 2 18 obtains the value of the C 0 concentration in the exhaust gas detected using the unit sampling time t sp as a unit input from the exhaust gas C 0 concentration sampling unit 2 17 And return the value of t sp / T.
  • the time T is obtained using the data shown in FIG. 20 stored in the data memory 222, and the exhaust gas having the CO concentration C ext detected by the CO sensor 211 is obtained. This is the time T when the indoor CO concentration reaches the danger criterion iifi Cth, assuming that it has leaked into the room.
  • the ratio of the sampling time t sp to the time T is obtained.
  • This value of t sp / T means that the proportion of t sp / T in the safe time T is spent, leaving only (1— t sp / T) of the safe rate.
  • tsp is spent, and the remaining safety time means only T-tsp time is left. .
  • the t sp / T calculating and integrating unit 218 calculates t sp / T at the first sampling time, and also at the next sampling time, t sp / T calculated by detecting CO concentration in exhaust gas. And calculate this! ?
  • the output value is added to t sp / T calculated at the previous sampling, and the integrated value is calculated.
  • the t sp / T calculation integration section 218 sequentially integrates the value of t sp / T obtained at the sampling time for each sampling time. In other words, if t sp / T 1 is found during the first sampling, and if t sp / T 2 is found at the next sampling time, the product! ?
  • the value of t sp / T 1 + t sp / T 2 is obtained as the integrated value. Also, when t sp / T 3 is obtained at the time of the third sampling, the integrated value is t sp (l / T l + 1 / T 2 + 1 / T 3).
  • the / T calculation and integration unit 218 integrates the value of t sp / T obtained at each sampling time, and gives the result to the CO safety work unit 214.
  • the CO safety operation unit 214 monitors the integration result given from the tsp / T calculation and calculation unit 218, and when the integrated value reaches a predetermined set value, for example, 1.0, the indoor C 0 concentration C Judge that the room has reached the danger judgment reference value C th set in advance, and perform CO safe operation such as shutting off gas to burner 4.
  • a predetermined set value for example, 1.0
  • the indoor C 0 concentration C Judge that the room has reached the danger judgment reference value C th set in advance
  • the indoor C0 concentration is obtained by an arithmetic expression in consideration of the indoor volume.
  • the calculation formula (1) for converting and calculating the CO concentration in the exhaust gas to the indoor CO concentration taking into account the indoor volume can be given in an extremely simple form, so that the calculation does not require a large-scale view. It is possible to perform a sufficiently accurate calculation using the micro-computer installed in the control device 6 of the combustion equipment, thereby performing a fine-grained safe operation with respect to C0 gas. Moreover, since the CO safe operation can be performed using the actual indoor CO concentration value, the accuracy of the CO safe operation is improved, and the reliability of the C0 safe operation is also thorough.
  • FIG. 20 shows data for calculating the time T at which the indoor C ⁇ concentration reaches the danger determination reference value from the value of the CO concentration in the exhaust gas.
  • the graph data is in the form, but the data can be given in a desired form such as a table, an arithmetic expression, or the like.
  • FIG. 21 is a control function block diagram of control means of a combustion device for performing a CO safe operation in the third embodiment.
  • the control means has a data memory 312, a gas type setting means 309, a combustion interrogation measuring means 313, and a C0 safe operation section 314.
  • the gas type setting means 309 sets the type of gas to be used.
  • a plurality of tact switches may be provided, and the rare gas to be used may be set by the & tact switch.
  • a gas type switching switch provided in a normal water heater or the like is used as gas type setting means.
  • This gas ⁇ setting means includes 13 A, 12 A, L 1 (6 B, 6 C, 7 A), L 2 (5 A, 5 B, 5 AN), L 3 (4 A, 4 B, 4 C). ) Select the gas type such as 6A, 5C, LPG etc. by switch operation.
  • the data memory 312 is provided with data obtained by dividing the correlation between the exhaust C ⁇ concentration and the dangerous arrival time T for each gas electrode as shown in FIG.
  • the horizontal axis of the graph data in Fig. 22 indicates the CO concentration of the exhaust gas, and the vertical axis indicates the risk that the exhaust gas leaks into the room and the indoor C0 concentration is the reference value for the dangerous state of C0 poisoning.
  • the danger arrival time T which reaches the judgment reference value of 300 ppm, is shown.
  • Curve A in the graph shows the L1 gas type
  • curve B shows the 13A gas type
  • curve C shows the propane gas type.
  • the time required for the indoor CO concentration to reach the hazardous judgment reference value of 300 ppm differs depending on the gas type.
  • the danger criterion value for the indoor CO concentration is 300 ppm, and the danger arrival time at which the indoor C0 concentration reaches the danger criterion value when it is assumed that exhaust gas of each C0 concentration has leaked into the room. Is given to memory 3 1 2 You.
  • the data showing the relationship between the exhaust CO concentration and the dangerous arrival time can be given not only from the graph data, but also from the table data and the calculation formula data.
  • the CO safe operation section 314 obtains the detection information of the CO concentration of the exhaust gas from the CO sensor 11 and also obtains the information of the used fll gas from the gas electrode setting means 309. Further, the CO safe operation section 3 14 stores the data stored in the memory 3 12 based on the gas type information and the information of the CO concentration in the exhaust gas input from the CO sensor 11. 22 From the data shown in 2, obtain the danger arrival time T when the indoor CO concentration becomes the danger criterion ⁇ when the exhaust gas leaks into the house.
  • the CO safety operation section 314 monitors the progress of combustion from the start of combustion from the combustion time measuring means 313, and when the combustion time reaches the danger arrival time T, the indoor C ⁇ concentration is reduced. Hazard judgment base Judgment is made that the vehicle has been lowered, and safety operations such as stopping the combustion operation are performed.
  • the danger arrival time T corresponding to the exhaust C 0 concentration is given separately for each gas rare: information on the used gas ffi and the CO sensor 11
  • the danger arrival time T is obtained based on the information on the exhaust COS degree detected at step C, and the C0 safety operation is performed. Therefore, an appropriate danger arrival time T can be obtained according to each exhaust CO concentration and rare gas, and the accuracy of the safe CO operation can be significantly improved by the nj function, and even if the indoor CO concentration does not reach the dangerous concentration. Regardless, it is possible to prevent a malfunction that combustion is stopped.
  • FIG. 23 is a control function block diagram of the control means of the combustion device that performs the CO safe operation in the third embodiment of the present invention.
  • the control means in the present embodiment includes a CO concentration sampling section 325 for exhaust gas, a tsp / T calculation integration section 327, a clock mechanism 3226, a data memory 312, It has a CO safe operation section 3 14.
  • the CO concentration sampling unit 325 samples the CO concentration C ext in the exhaust gas from the CO sensor 11 after the start of combustion in units of a predetermined unit sampling time t sp given in advance. Specifically, the C0 concentration sampling unit 3 25 sets the sampling time to, for example, 10 seconds, obtains the detection information of the C ⁇ sensor 11 every second, obtains the average value, and obtains the unit. Determine as the value of CO concentration in exhaust gas per sampling time. The timing of this sampling is This is performed based on the signal of the clock mechanism 3 26 constituted by the above.
  • the t sp / T calculation integration unit 327 obtains the value of the CO concentration in the exhaust gas detected in units of the unit sampling time t sp given from the CO concentration sampling unit 3 25, and calculates the t sp / T Calculate the value.
  • the graph data of each curve shown in FIG. Which data is to be used is selected based on the used gas type information taken in from the gas type setting means 309 as in the third embodiment. For example, if the gas used is 13 A, the data of curve B is selected, and the danger arrival time T is calculated based on this data.
  • this danger arrival time T is, assuming that the exhaust gas with the C0 concentration Cext detected by the C ⁇ sensor 11 has leaked into the room, assuming that the indoor CO concentration is, for example, 300 ppm. Jd to the quasi-value C th]. Then, when the sampling time t sp is reached by R ⁇ T when the danger criterion value is reached, the sum of the sampling time t sp for that time point is obtained.
  • This value of t sp / T means that the proportion of t sp / T in the safe time T is spent, leaving only (l- t sp / T) safe cases. I do. In other words, of the time T when the indoor C0 concentration reaches the danger criterion value, tsp is spent, and the remaining safety time is only T-tsp. means.
  • the t sp / T calculation integration unit 3 2 7 first calculates t sp ZT at the first sampling time of 15, and also at the next sampling time, detects the CO concentration in the exhaust gas. / T is calculated, and this calculated value is added to t sp / T obtained in the previous sampling to obtain an integrated value. In this way, the tsp / T calculation integration unit 327 sequentially integrates the value of tsp / T obtained at each sampling time tsp for each sampling time. For example, if t sp / T 1 is obtained by T 1 for exhaust C ⁇ concentration C extl during the first sampling, then t sp / T 1 is obtained by T 2 for exhaust CO concentration C ext2 at the next sampling time.
  • T 2 is obtained, and the value of t sp / T 1 + t sp / T 2 is obtained as an integrated value.
  • the integrated value is t sp (1 / T 1 + 1 / + 2 + 1 / ⁇ 3)
  • the t sp / T calculation integration unit 327 integrates the value of t sp / T obtained at each sampling time, and provides the integration result to the CO safe operation unit 314.
  • the safety operation unit 314 monitors the integration result given from the tsp / T calculation integration unit 327, and when the integrated value reaches a predetermined set value, for example, 1.0, the indoor CO concentration C room is Judge that the danger judgment reference value C th set in the above has been reached, and perform the CO safe operation such as shutting off the gas to Pana 4.
  • a predetermined set value for example, 1.0
  • data on the relationship between the exhaust CO concentration and the danger arrival time T corresponding to the gas type in the combustion operation state of the combustion equipment is selected, and is adapted to the gas type used.
  • ts / T is calculated for each sampling time in accordance with the value of the CO concentration in the exhaust gas detected by the CO sensor 11, and integrated one after another. Therefore, it is possible to accurately determine the danger arrival time at which the indoor C0 concentration reaches the danger determination reference value, thereby further improving the accuracy of the CO safe operation.
  • the present invention is not limited to the above embodiments, and various embodiments can be adopted.
  • the criterion value for determining that a person in a room is at risk of CO poisoning is defined by the indoor CO concentration, but in addition to the above, the amount of CO taken into human blood by moglobin, That is, it may be specified by the value of the blood hemoglobin C0 concentration.
  • the risk judgment reference value for example, 10%
  • Danger arrival time T a correlation data of the danger arrival time T corresponding to each exhaust CO concentration may be created for each gas type and provided to the data memory 312.
  • correlation data between the exhaust CO concentration and the dangerous arrival time T is given for each gas type as shown in the data of FIG.
  • correlation data may be provided for only one representative gas type.
  • the danger arrival time T for other gas types is It can be obtained by multiplying the danger arrival time T obtained using the correlation of the gaseous species by a correction coefficient given in advance.
  • the correction coefficient may be set to a value corresponding to the difference or ratio of the displacement between the representative gas type and the actual gas type used per unit time ( further, the representative gas paddle is detected by the exhaust gas component. It may be given for each gas type group arbitrarily determined in consideration of the output value.
  • a description will be given of a combustion apparatus according to a fourth embodiment that performs a CO safe operation in consideration of the structure of the supply and exhaust pipes in addition to the CO concentration of the exhaust gas detected by the CO sensor.
  • the system of the combustion equipment in each of the following embodiments is the same as that shown in FIGS. 5 and 6, and a redundant description of the components of these combustion equipment will be omitted.
  • FIG. 24 is a control function block diagram of a control unit of a combustion device performing a C0 safe operation in the fourth embodiment.
  • the control means of the present embodiment includes a data memory 4 17, a combustion measurement stage 4 18, a CO safety operation section 4 20, and a supply / exhaust structure switching setting means 4 2 1. are doing.
  • the air supply / exhaust structure switching setting means 421 sets the air supply / exhaust structure on the exhaust side of the water heater.
  • the supply / discharge structure switching setting means 4 21 is provided, for example, as a switch on the control board of the control device 4 12.
  • a dual pipe supply / exhaust structure as shown in Fig. 5 is set.
  • a double pipe supply / exhaust structure as shown in Fig. 6 is set. Is set. In this way, the supply and exhaust structure of the double pipe and the double pipe is switched and set by the switch operation. Then, the information on the air supply / exhaust structure set by the air supply / exhaust structure switching setting means 4 21 is given to the CO safe operation section 4 20.
  • Data memory 4 17 has the start condition data of C0 safe operation corresponding to the dual pipe supply / exhaust structure as shown in Fig. 25 and the dual pipe supply / exhaust structure as shown in Fig. 26.
  • the start condition data of the C0 safe operation is given separately.
  • the indoor CO concentration in the case of the double-pipe supply / exhaust structure is greatly affected by the combustion capacity, so that a data corresponding to the combustion capacity is given.
  • the indoor CO concentration in the case of the double pipe supply / exhaust structure is larger than the exhaust gas displacement. Data is given corresponding to the fan airflow.
  • the horizontal axis of the graph data in Fig. 25 shows the CO concentration of the exhaust gas
  • the vertical axis shows the reference value for the dangerous state of C0 poisoning when the exhaust gas leaks into the room and the indoor C0 concentration is dangerous. It indicates the time when the danger is reached when the judgment value reaches 300 ppm.
  • Curve A in the graph indicates the operating condition when the combustion capacity of the combustion equipment is 40,000 Kcal / h
  • curve B indicates the operating condition when the combustion capacity is 29500 Kcal / h. It is shown.
  • the danger criterion value of the indoor CO concentration is set to 300 ppm, and when it is assumed that the exhaust gas of each C0 concentration has leaked into the room, when the danger that the indoor C0 concentration reaches the danger criterion value is reached.
  • the questions are given to the memory 417 as the initial conditions for CO safe operation of the double pipe supply / exhaust structure for each combustion capacity of the combustion equipment.
  • G indicates the operating state when the fan speed (rpm) is 5000 rpm.
  • data indicating the relationship between the exhaust CO concentration and the danger arrival time T is given separately for each fan airflow.
  • the data is stored in the data memory 417 in an appropriate form such as graph data, table data, or arithmetic expression data.
  • the CO safety operation section 420 acquires the detection information of the CO concentration of the exhaust gas from the CO sensor 416, and also acquires the fan capacity information corresponding to the combustion capacity information and the exhaust 3 information.
  • the combustion capacity ⁇ i5 report is obtained from the combustion control unit of the control device 4 12 ⁇ .
  • V the gas passage 407 of the burner 406 is opened in the gas passage 407.
  • An electromagnetic valve 415 for closing and a proportional valve 415 for controlling the gas supply amount by the valve control amount are provided. The opening amount of the proportional valve 415 is controlled by the combustion control unit 423.
  • the combustion control unit 4 23 adjusts the combustion capacity so that the temperature at the outlet side of the hot water heat exchanger 408 becomes the set temperature set by the remote controller 4 13.
  • the magnitude of the valve-opening drive current applied to the proportional valves 415 is obtained by calculation and controlled so that this combustion capacity is obtained. That is, the magnitude of the valve-opening drive current applied from the combustion control unit 4 2 3 to the proportional valve 4 15 corresponds to the magnitude of the valve opening amount of the proportional valve 4 15, in other words, the magnitude of the gas supply amount. However, this corresponds to the combustion capacity calculated by the combustion control unit 423.
  • the detection data of the valve-opening drive current is taken in as the combustion performance information.
  • the fan-style information is provided, for example, by a fan rotation number detection sensor 424 such as a Hall IC that detects the fan rotation number of the fan 405 as shown in FIG. 15 and FIG.
  • the fan number detection of the number detection sensor 4 2 4 is obtained as air volume data.
  • the CO safety operation unit 420 When the supply / exhaust structure set by the supply / exhaust structure switching setting means 4 21 is a 2 S pipe supply / exhaust structure, the CO safety operation unit 420 has CO safe operation ⁇ start condition data as FIG. If the supply / exhaust structure is a double pipe supply / exhaust structure, select the data shown in Fig. 26 as the CO safety operation start condition overnight. Then, in the case of a double pipe supply / exhaust structure, based on the combustion capacity information and the information on the CO concentration of the exhaust gas detected by the CO sensor 416, the curve corresponding to the combustion capacity corresponds to the detected CO concentration. Danger arrival time T is obtained.
  • the CO safety department 420 monitors the combustion elapsed time from the start of combustion using the combustion time measuring means 418, and when the combustion time reaches the danger arrival time T, the indoor C 0 Judgment that the concentration has reached the danger judgment reference value and perform safe operation such as stopping the combustion operation.
  • the supply / exhaust structure switching setting means 4 221 sets the double pipe supply / exhaust structure
  • the data shown in FIG. 26 is selected.
  • the CO safety operation unit 420 acquires information on the CO concentration of the exhaust gas detected by the C0 sensor 4 16 and information on the fan air volume which is information on the exhaust gas amount, and further obtains the fan From the air volume curve graph data corresponding to the air volume information, the danger arrival time T corresponding to the C0 detection concentration of exhaust gas is calculated. get.
  • the CO safety operation unit 420 determines that the indoor C0 concentration has reached the danger judgment reference value when the combustion time from the start of combustion reaches the danger arrival time T, and similarly stops the combustion operation. And other safety actions.
  • the water supply / exhaust structure of the water heater is a double pipe supply / exhaust structure or a double pipe supply / exhaust structure, and corresponds to the actual water supply / exhaust structure of the water heater.
  • C ⁇ Safety operation start condition data is selected. Then, since the CO safe operation is performed using the data dedicated to the actual air supply and exhaust structure, the CO safe operation according to the actual conditions of the actual air supply and exhaust structure is performed accurately, and as a result, the CO safe operation is performed. Accuracy and reliability can be improved.
  • the data of the valve-opening drive current to the proportional valve 415 is used as the combustion capacity information.
  • the data of the gas supply amount and the combustion control are used instead.
  • the data of the calculated value of the combustion capacity calculated in the part 423 may be used.
  • a gas flow sensor or the like is provided in the gas supply circuit 407, and the detection signal of the gas supply amount by this sensor is provided. Input to CO safe operation section 420.
  • airflow sensors and wind speed sensors that detect airflow directly or indirectly are provided in the ventilation path from the power supply side to the exhaust side using fan rotation data as fan airflow data.
  • fan rotation data As fan airflow data.
  • the fan drive power can be used as the fan air volume.
  • FIG. 28 is a control function block diagram of a control unit of a combustion device that performs a CO safe operation according to the fourth and second embodiments of the present invention.
  • the control means of the present embodiment includes a CO concentration sampling section 425 of exhaust gas, a tsp / T calculation integration section 427, a clock mechanism 426, a data memory 417, It has a CO safe operation section 420 and supply / exhaust structure switching setting means 421.
  • the CO concentration sampling unit 4 25 samples the CO concentration C ext in the exhaust gas from the CO sensor 4 16 after the start of combustion in units of a predetermined unit sampling time t sp given in advance. Specifically, the CO concentration sampling unit 4 25 sets the sampling time to, for example, 10 seconds, and detects the detection information of the CO sensor 4 16 every 1 second. Obtain the average value and determine it as the value of the CO concentration in the exhaust gas per unit sampling time. Note that the timing of this sampling is performed based on a signal of a clock mechanism 426 constituted by a clock or clock.
  • the data memory 417 is provided with CO safe operation start condition data divided for each supply / exhaust structure as shown in FIGS. 25 and 26 in the same manner as in the fourth embodiment. .
  • the air supply / exhaust structure switching setting means 4 21 may be configured such that the water supply / exhaust structure of the water heater is a double pipe supply / exhaust structure or a double pipe supply / exhaust structure. This is to set whether there is any.
  • the t sp / T lS output integrating section 4 27 obtains the value of the C ⁇ concentration in the exhaust gas detected with the unit sampling time t sp given by the CO concentration sampling section 4 25 Find the value of sp / T.
  • the danger time T is obtained using the data shown in FIG. 26, which is stored in the data memory 4 17 as shown in FIG. 25. Whether to use the data shown is determined by the air supply / exhaust report of the air supply / exhaust structure switching setting f stage 421. In other words, if the air supply / exhaust structure is a dual air supply / exhaust structure, the data of ⁇ 25 is selected. Then, in FIG. 25, the data selected from the graph data of the curves shown in FIG. 25 is used in the fourth embodiment. Is selected based on the combustion performance information obtained in the same manner as in the above embodiment. For example, when the combustion capacity information indicates 29500 Kcal / h, the data of the curve B is selected, and the danger arrival time T is calculated based on this data.
  • the data for the CO safety operation [starting condition data is selected as shown in Fig. 26, the data in the graph of each curve shown in Fig. 26 is displayed. Whether to use it or not is selected in accordance with the fan air volume information acquired in the same manner as in the fourth embodiment. For example, when the fan air volume information is 6000 rpm, the entirety of the curve E is selected, and the danger arrival time T corresponding to the exhaust CO concentration is obtained.
  • the danger arrival time T is, assuming that the exhaust gas having the CO concentration C ext detected by the CO sensor 416 leaks into the room, assuming that the indoor CO concentration is 300 ppm, for example, the danger criterion value C th It is time to reach.
  • the ratio of the sampling time t sp to the time T is obtained by dividing the question t sp by the time T at which this danger criterion value is reached.
  • This value of tsP / T means that the ratio of tsp / T in the safe time T is spent, leaving only the safe ratio (l-tssp / T).
  • the indoor CO concentration reaches the danger criterion value t, t sp has been reduced, and the only remaining safety time is ⁇ 1 t sp.
  • the t sp / T calculation and integration unit 427 calculates t sp / T at the first sampling time, and also at the next sampling time, the t sp / T calculated by the detection of CO concentration in exhaust gas. T is calculated, and the calculated value ⁇ : is added to ts P / T obtained in the previous sampling to obtain an integrated value. In this way, the tsp / T calculation calculating unit 427 successively applies the value of tsp / T obtained in the sampling time tsp to each sampling time U.
  • t sp / T 1 was obtained by TI for exhaust C 0 concentration C extl at the first sampling 3 ⁇ 4, and exhaust C 0 concentration C ext2 at the next sampling time From T 2, t sp / T 2 is obtained, and the value of sp / T 1 + t sp / T 2 is obtained as a calculated value. Also, at the time of 3 ⁇ 3rd sampling ⁇ , when t sp / T 3 is obtained from T 3 for exhaust CO concentration C ext3, the integrated value is t sp (1 / T 1 + 1 / T 2 + 1 / T 3 ).
  • the t sp / T calculation integration unit 427 performs fr ⁇ on the value of t sp / T obtained at each sampling time, and provides the integration result to the CO safe operation unit 420. It should be noted that the integrated value of t sp / T is obtained in the same manner when the graph shown in FIG. 26 is selected.
  • the CO Safety Department 420 monitors the integration result added from the tsp / T calculation integration unit 427, and when the integrated value reaches the set value, for example, 1.0, the indoor C ⁇ concentration C room is Judgment is made that the danger judgment reference value C th has been set in advance, and a CO safe operation such as shutting off gas to the parner 406 is performed.
  • the combustion capacity at the first sampling time is the capacity of the curve ⁇ in Fig. 25.
  • the capacity changed to the curve B At the time of the second sampling time, the capacity changed to the curve B, and at the time of the third sampling, the combustion capacity changed to the curve C
  • the value of t sp / T is obtained using the data of the curve A
  • the value of t sp / T is obtained using the curve B.
  • the third [T sp / T is obtained using the data of curve C at the time of sampling at the HJ.
  • t sp / T is obtained using the combustion capacity data corresponding to the change in the combustion capacity, and is obtained at each sampling.
  • T sp / T is integrated, and when the integrated value becomes 1, C 0 safe operation is performed.
  • t sp / T is calculated at each sampling time according to the value of the carbon dioxide concentration in the exhaust gas detected by the CO sensor 416, and is successively integrated.
  • the danger when the indoor c0 concentration reaches the danger criterion value can be determined accurately in consideration of the combustion performance of the combustion operation and changes in the fan wind M. This makes it possible to further improve the accuracy of the C0 safe operation together with distinguishing the CO safe operation start condition data by the supply / exhaust structure.
  • the present invention is not limited to the form of each projecting but can take various forms of projecting.
  • the reference value for the danger of C ⁇ poisoning in a room is defined by the indoor C0 concentration, but in addition to that, CO taken into human blood by moglobin is also specified. It may be defined by the amount, that is, the value of blood hemoglobin CO concentration. In this case, it is assumed that when the blood hemoglobin CO concentration reaches the risk judgment reference value (for example, 10%), it is assumed that CO poisoning is in danger, and the time required for the blood moglobin CO concentration to reach the risk judgment reference value is determined.
  • the risk judgment reference value for example, 10%
  • the correlation data of the danger arrival time T corresponding to each exhaust C0 concentration for each combustion capacity or each exhaust air volume, that is, each fan air volume, is created separately for each air supply / exhaust structure and stored in the data memory 17. Just give it.
  • the correction coefficient may be given as a value corresponding to the difference or ratio of the displacement per unit time corresponding to the difference in capacity between the representative combustion capacity and the combustion capacity in the actual operating state (input combustion capacity information). .
  • the danger arrival time T for the exhaust gas concentration of the other fan wind is the correction coefficient given to the danger arrival time T obtained based on the correlation data of the representative fan wind S. Multiplied by This correction coefficient may also be given as a value corresponding to the difference or ratio of the exhausted Si per unit time corresponding to the difference between the representative fan airflow and the fan airflow in the actual operating state (manually operated fan airflow information). .
  • the data for obtaining the dangerous arrival time ⁇ of the CO safe operation start condition data based on the exhaust CO concentration and the combustion capacity (or fan air volume) obtained from the exhaust gas CO concentration and the fuel gas may be given separately for each gas type. Since the composition of fuel gas differs depending on the gas type, the amount of exhaust per unit time differs depending on the gas type. Therefore, even if the C ⁇ concentration of the exhaust gas is the same value, when the exhaust gas leaks into the room, the degree of the C0 contamination in the room increases as the type of exhaust gas increases per unit time. Therefore, by giving the CO safe operation start condition data separately for each rare gas to be used, more precise and reliable CO safe operation can be performed. In this case, the information of the gas type switching switch provided in the ordinary water heater etc. is taken in, the type of gas used is determined, and the safety operation start condition data corresponding to that gas type is used. Thus, the C0 safety operation may be performed in the same manner as in each of the above embodiments.
  • the adapter 403 is provided on the exhaust side of the water heater, and the double pipe and the double pipe supply / exhaust unit 404 are detachably mounted.
  • the adapter 403 may be omitted, and a water supply / exhaust structure of either the S pipe or the double pipe may be attached to the exhaust side of the water heater.
  • any of the air supply and exhaust structures can be used at the installation site of the water heater. It will be able to cope well even if it is installed.
  • a suction / exhaust type water heater in which the fan 405 is provided on the exhaust side has been described as an example.
  • the present invention provides a fan as shown in FIG. Can also be applied to the water heater of the extrusion supply / exhaust type provided below the parner.
  • a single-function hot-water supply device (a hot-water supply device having only a hot-water supply function) has been described as an example of a combustion device.
  • the combustion device of the present invention has a bath function, a hot-water supply function, and a heating function. It can be applied to various types of combustion equipment, such as functions and hot water supply functions, cooling and hot water supply functions, cooling and heating functions and hot water supply functions, wind ovens, heating machines, cooling and cooling / heating machines, and internal installation types.
  • FIG. 30 is a diagram showing a configuration of a water heater as an example of the combustion equipment.
  • a hot water tap (not shown) is opened, water passes through the water supply sensor 5 12 and branches to the hot water supply heat exchanger 5 16 and the binos passage 5 14 .
  • the water flow sensor 5 1 2 senses the flow.
  • the fan 52 which sucks air from the air supply passage 55, and discharges the exhaust gas after combustion from the exhaust passage 55, rotates, and the prepurge starts.
  • the original gas solenoid valve 528 and the gas solenoid valve 530 are opened at the time of the ignition, and gas flows through the gas proportional valve 532.
  • the flame rod 520 detects the flame and starts burning.
  • the hot water heated by the hot water supply heat exchanger 5 16 and the water passing through the bypass passage 5 14 are mixed and the hot water flows into the hot water tap.
  • the opening of the gas proportional valve 532 and the number of revolutions of the fan 5224 are controlled so that the temperature of the hot water outlet 5356 becomes the set temperature. If the ignition does not occur within the predetermined time, the safety circuit operates, shuts off the gas solenoid valve 528 and the gas solenoid valve 530, and stops the discharge.
  • Hot water supply, water volume, water pressure change during hot water supply If the tap water temperature changes due to gasification, etc., the set temperature difference is calculated from the tap water temperature, the incoming water temperature, and the amount of water, and the deviation is transmitted to the gas proportional valve 532 and the water fi control valve 538. Control to keep at the set temperature.
  • the fan 52 4 has a hall IC 5 26 that detects the number of rotations of the fan.
  • the rotation of the fan 5 24 Is controlled to be sent to the burner 5 2 2.
  • the electrical board 560 has, for example, a microcomputer including a RAM, a ROM, a CPU, and the like, and the CPU executes the above-described combustion control based on a combustion program stored in the ROM.
  • a CO sensor 540 is provided in the exhaust passage.
  • the resistance value of the gold resistor which changes in response to the temperature change, is compared with a comparative element and converted into a CO concentration.
  • the number of rotations of the fan 524 increases, and complete combustion is achieved by increasing the amount of air sent into the combustion chamber.
  • the rotation speed of the fan is controlled so as to be performed. However, in spite of the increase in the wind, if the CO gas concentration does not decrease and reaches a predetermined concentration or more, the combustion is stopped.
  • the exhaust S of the exhaust gas to be exhausted changes according to the rotation speed of the fan 524. That is, the larger the number of rotations of the fan, the larger the displacement, and the smaller the number of rotations of the fan 52, the smaller the displacement.
  • the above-mentioned ER value depends not only on the C 0 degree in the exhaust gas but also on the exhaust gas S :. Therefore, in the fifth embodiment of the present invention, not only the C ⁇ concentration of the exhaust gas, but also the ER value taking into account the rotation speed of the fan, which is substantially proportional to the amount of exhaust from the exhaust passage 552, is considered. Combustion equipment for monitoring and controlling C0 concentration in air is provided.
  • FIG. 31 is a flowchart of the CO concentration monitoring control according to the fifth embodiment.
  • the CO concentration monitoring and control described below (the fifth and second embodiments and the The fifth embodiment (including the fifth and third embodiments) is executed by the electric board 560 which is the control means of the above-described combustion equipment.
  • step S510 the CO concentration of the exhaust gas is detected, and in step S510, the rotation speed of the fan is detected.
  • the CO concentration of the exhaust gas is measured every 0.2 seconds by the CO sensor 540, and the rotation speed of the fan is measured every 0.1 second by the hall IC 526.
  • an average value of the C ⁇ concentration during a predetermined unit time t (step S5 12) such as 10 seconds is obtained (step S5 14).
  • the ⁇ -average value is calculated because, for example, when starting the combustion operation and when switching the combustion capacity, the detected CO concentration may fluctuate, such as a temporary increase in the CO concentration. To obtain a more accurate C 0 concentration.
  • a certain unit time t is required to obtain such an average value of f, and at this time, the question can be set to any.
  • step S 5 18 is synchronized with the unit time t in step S 5 14, and the rotation speed of the fan is changed by switching the combustion capacity during the time period t. If it has changed, a large rotation speed is selected by ⁇ of the unit time t (step S520). Since the instantaneous change during combustion is smaller than the C ⁇ concentration, it is not necessary to take f-average, so the maximum value of the fan speed is used from the point of safety side. . Of course, an average value may be used for more accurate control.
  • step S522 the corresponding ER value is obtained from the average of the CO concentration and the maximum fan rotation speed value, and the ER value table divided according to the average value.
  • FIG. 32 is an example of the table. This table is stored in, for example, R0M in the microcomputer provided in the electrical equipment board 560 in FIG. 30 for performing various combustion controls in the combustion equipment as described above. According to the table, different ER values are given when the fan rotation speed (displacement amount) is different even for the same CO concentration. In other words, if the fan speed is high, the ER value is large because the exhaust volume is large, and if the fan speed is small, the ER value is small because the exhaust volume is small. The ER value in FIG. 32 is also multiplied by 250 for the same reason as described above.
  • step S522 The ER value selected in step S522 is multiplied by the product in step S522. And the TR value is calculated. Then, when the integrated TR value reaches a predetermined reference value, an alarm such as a lamp or a buzzer is issued (step S530), and the combustion is stopped (step S532).
  • the CO concentration monitoring control is used to compensate for a temporary decrease in the CO concentration in the air, such as when combustion is temporarily stopped while integrating the ER value. (Not shown) may be provided.
  • a plurality of reference values are set for the TR value.For example, before the blood hemoglobin CO concentration reaches a predetermined dangerous concentration, only an alarm is issued and a process in which combustion is not stopped, or a process in which combustion is temporarily stopped. In this case, a finer control step may be provided, such as a step of lowering the degree of COS in the air and then restarting combustion.
  • the ER value is obtained by using the rotation speed of the fan which is substantially proportional to the ER value in order to take the exhaust gas amount into consideration, but, for example, a wind turbine provided in the exhaust passage is used.
  • the exhaust gas may be directly measured by a sensor to obtain the corresponding ER ffi.
  • a fifth and second embodiment of the present invention will be described.
  • the fifth and second embodiments not only the C0 concentration of the exhaust gas but also the ER considering the volume of a space such as a room in a room where the exhaust gas may leak from the exhaust passage. Accordingly, there is provided a combustion apparatus for monitoring and controlling the concentration of C0 in the air in the space.
  • FIG. 33 is an example of a table of the ER value at the average value of the CO concentration corresponding to a plurality of spaces having different volumes. As before, this table is stored in a storage means such as the ROM of the microcomputer of the electrical equipment board 560 if it is clean. According to FIG. 33, if the CO concentration of the exhaust gas is the same, the ER value decreases as the volume of the discharged space increases. Further, the volume of the air gap is set in advance by a switching switch (not shown) provided in the combustion equipment.
  • the exhaust passage when the exhaust passage is arranged adjacent to a plurality of spaces in the room, it is safe to use the ER value of the smallest volume among the spaces as the volume of the set space. Preferred from the parent point of In addition, the division of the space may be divided more finely than the number of divisions shown in FIG. 33 in order to perform finer and more precise control.
  • the CO concentration monitoring control in the present embodiment is the same as the flow chart in FIG. The process is almost the same, and the processes of steps S516, 518, and 520 in FIG. 31 are not performed, but in step S522, the process shown in FIG. 33 provided in the present embodiment is performed.
  • the corresponding ER ffi is obtained from the ER value table.
  • a combustion apparatus for performing C0 concentration monitoring and control in the air according to an ER value in consideration of an exhaust gas amount and a fffij method of a space volume.
  • FIG. 34 shows, for each of the divisions of the space volume described in the fifth embodiment, the ER value corresponding to the rotation speed of the fan described in the first embodiment.
  • An example of a table is shown. As described above, this table is stored in a storage means such as a ROM of a microcomputer of the electronic circuit board 560 in a row. The microcomputer selects a table of ER values corresponding to the number of fans in the volume division according to the volume set by the cut-off switch for setting the volume of the space. Perform the corresponding CO concentration monitoring and control.
  • the CO concentration monitoring control in the present embodiment is almost the same as the flowchart in FIG. 31.
  • step S522 in FIG. 31 the ER value shown in FIG.
  • the corresponding ER reconnaissance is obtained from the table.
  • the table shown in Fig. 34 is stored in the memory with the table for the 20 f supply / exhaust structure, the table for the dual pipe supply / exhaust structure, or the table for each gas type. By selecting an appropriate table, it is possible to perform a more optimal C0 safety enactment.
  • the data for determining the time required for the person in the room to reach the danger state of CO poisoning is divided into one or more combustion performances and exhaust volumes. Given. Then, when actually performing the CO safety operation, information on the combustion capacity and the displacement is obtained, and the c ⁇ safe operation is performed based on the time to reach the danger corresponding to the combustion capacity and the displacement. Therefore, the accuracy of c ⁇ safe operation is greatly improved, and even though the person in the room does not reach the danger of c ⁇ poisoning, This eliminates the problem of premature shut-off, such as safe operation such as burning stop, and greatly improves the reliability of CO safe operation.
  • the arithmetic expression for obtaining the indoor C0 concentration is determined by the following equation.
  • the time is given as a parameter, and the indoor C ⁇ concentration is obtained based on this equation. Therefore, it is possible to give an expression for calculating the indoor CO concentration using the value of the CO concentration in the exhaust gas in an extremely simple form, thereby eliminating the need for a large-scale computer and the combustion equipment.
  • Accurate room C0 concentration can be obtained by using the microcomputer installed in the room.
  • the present invention is based on the fact that the mechanism of C0 contamination in the room when exhaust gas leaks into the chamber differs depending on whether the supply / exhaust structure of the combustion equipment is a 2S pipe structure or a 2 pipe structure. Attention is given to the c ⁇ safe operation start condition data corresponding to each air supply and exhaust structure. As a result, regardless of whether the combustion equipment is connected to a double-pipe or double-pipe air supply / exhaust structure, CO safe operation based on the CO safe operation start condition Therefore, the accuracy of C ⁇ safe operation is greatly improved, and the reliability of CO safe operation can be increased.
  • the ER value is determined not only by the C ⁇ concentration in the exhaust gas but also by the It is determined in consideration of the amount of exhaust gas due to the engine speed, the volume of the space where exhaust gas is exhausted, the supply / exhaust structure and / or the type of gas. This enables more accurate and reliable monitoring and control of CO concentration.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

Appareil de combustion permettant de décider du moment où doit être effectuée une opération telle que l'arrêt de la combustion en prenant en compte des critères de sécurité au niveau du monoxyde de carbone, d'après des informations relatives à la concentration du monoxyde de carbone contenu dans les gaz d'échappement et détecté par un détecteur de monoxyde de carbone qui est monté sur l'appareil de combustion, ainsi que d'après des informations relatives à la capacité de combustion de l'appareil, la quantité de gaz d'échappement, le volume d'une chambre dans laquelle sont émis les gaz d'échappement, les types de gaz du combustible utilisé ou la construction des tuyaux d'admission et d'échappement de l'appareil de combustion (une construction à deux tuyaux, ou une construction à tuyau jumelé).
PCT/JP1997/002429 1996-07-17 1997-07-14 Appareil de combustion WO1998002693A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97930779A EP0913644A1 (fr) 1996-07-17 1997-07-14 Appareil de combustion

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP8/206641 1996-07-17
JP8/206640 1996-07-17
JP20664096A JP3727418B2 (ja) 1996-07-17 1996-07-17 燃焼機器のｃｏ安全装置
JP20664196A JPH1030817A (ja) 1996-07-17 1996-07-17 燃焼機器およびそのｃｏ安全動作方法
JP20901796A JPH1038270A (ja) 1996-07-19 1996-07-19 Ｃｏ安全装置付燃焼機器およびそのｃｏ安全動作方法
JP8/209017 1996-07-19
JP8/218017 1996-07-31
JP21801796A JP3691599B2 (ja) 1996-07-31 1996-07-31 燃焼機器
JP28641896A JP3810153B2 (ja) 1996-10-29 1996-10-29 Ｃｏ濃度監視方法及びそれを実施する燃焼装置
JP8/286418 1996-10-29

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US8109759B2 (en) * 2006-03-29 2012-02-07 Fives North America Combustion, Inc. Assured compliance mode of operating a combustion system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02298723A (ja) * 1989-05-10 1990-12-11 Rinnai Corp 燃焼安全装置
JPH0526438A (ja) * 1991-07-19 1993-02-02 Paloma Ind Ltd 燃焼機器の不完全燃焼防止装置
JPH0646164U (ja) * 1992-11-30 1994-06-24 株式会社ガスター 燃焼機器の安全装置
JPH08178281A (ja) * 1994-12-28 1996-07-12 Tokyo Gas Co Ltd 対ｃｏガス安全システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02298723A (ja) * 1989-05-10 1990-12-11 Rinnai Corp 燃焼安全装置
JPH0526438A (ja) * 1991-07-19 1993-02-02 Paloma Ind Ltd 燃焼機器の不完全燃焼防止装置
JPH0646164U (ja) * 1992-11-30 1994-06-24 株式会社ガスター 燃焼機器の安全装置
JPH08178281A (ja) * 1994-12-28 1996-07-12 Tokyo Gas Co Ltd 対ｃｏガス安全システム

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