JPH11248154A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device having highly reliable safety by giving a warning before limitation of use in accordance with an integrated value of the combustion time and the number of combustions, and permitting the combustion device to be reusable after initializing the integrated value through inspection. SOLUTION: The combustion time and the number of combustions of a burner 12 for combusting fuel, such as gases or petroleum, are integrated to watch whether or not the integrated value has reached a reference value (a use-limit value or a limitation warning value), thereby notifying the necessity for an inspection or inhibiting an ignition. Further, after initializing the integrated value through the inspection, the reference value is updated and a combustion device is permitted to be reusable, thus ensuring high safety of the combustion device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus capable of giving a notice before the limit of use by an integrated value of a combustion time and the number of times of combustion.

[0002]

2. Description of the Related Art Conventionally, a combustion device used in a hot water supply device or the like burns fuel gas and discards the combustion gas to the outside.
Strict safety standards are set in order to prevent fire, monoxide poisoning, etc., and various safety mechanisms are provided for equipment. This safety mechanism shuts off the fuel supply, for example, when the flame leaks due to corrosion of the heat exchanger in conjunction with the melting of the thermal fuse. When the value rises to the value, the fuel supply is stopped. In addition, before such a safety mechanism operates, if the combustion life or the number of times of combustion is integrated to reach the end of the life of the combustion equipment, a preset use limit can be predicted, and the ignition of the combustion equipment is forced according to the integrated value. It is also possible to prevent accidents by prohibiting accidents. For example, there is Japanese Patent No. 2621597.

[0003]

By the way, in the hot water supply equipment, the combustion equipment is encouraged to perform a periodic inspection before reaching the end of its life, and the deteriorated parts such as the heat exchanger and the CO sensor are replaced, so that the combustion equipment can be reused. It is possible, and maintenance management according to the use time and the number of times of use leads to ensuring the safety of the combustion equipment.

[0004] Therefore, the present invention improves safety by giving a notice before the service limit in accordance with the integrated value of the burning time and the number of times of burning, and returning to the initial value of the integrated value after inspection to enable reuse. It is an object to provide an enhanced combustion device.

[0005]

According to the combustion apparatus of the present invention, the combustion time and the number of combustions of a burner (12) for burning fuel such as gas or oil are integrated, and the integrated value is used as a reference value (use limit value or use limit value). By monitoring whether or not the limit (preliminary notice value) has been reached, notification or ignition that requires inspection is prohibited, and the reference value is updated and reused by returning the integrated value to the initial value after inspection. It was done.

A combustion apparatus according to the present invention includes a burner (12) for burning fuel, a heating time or the number of times of combustion for each combustion operation of the burner, and an integrated value, a use limit value of the burner, and a use limit of the burner. A limit notice value smaller than the limit value is stored, and when the integrated value reaches the limit notice value, a notification signal indicating the arrival is generated, the maximum combustion amount of the burner is reduced, and the integrated value is used for the use. Control means (control device 50) for prohibiting ignition of the burner after reaching the limit value, and when the integrated value is returned to the initial value, the use limit value and the limit notice value are updated, It is characterized in that the reduced maximum combustion amount of the burner is returned to the initial state.

[0007] With this configuration, by updating and storing the integrated value of the combustion time or the number of times of combustion, it is monitored whether or not the integrated value has reached the limit notice value, and the integrated value has reached the reference integrated value. Then, the arrival can be known by the notification signal. At this time, the maximum combustion amount is limited to reduce the load on the consumable parts to maintain the durability, and to give the user a sense of trouble during use to encourage the user to perform inspection and repair. Based on this, the equipment is inspected and worn parts are replaced. After replacing the consumable parts, by returning the integrated value to the initial value, the use limit value and the limit notice value were updated to values smaller than the previous value, and at the same time, decreased when the limit notice value was reached. The maximum burn amount of the burner is returned to the initial state. As a result, safe combustion is ensured.

[0008] In the combustion apparatus according to the present invention, the initial value of the integrated value is a zero value or a constant value that is increased step by step with each update. The update value of the integrated value may be a zero value, a constant value other than zero, or an increased value. That is, the initial value of the integrated value is determined based on the relative relationship between the use limit value and the limit notice value, and based on the assumption that the safety is enhanced by reducing the width of both according to the use time. ing.

[0009] In the combustion apparatus according to the present invention, the use limit value and the limit notice value are set to a constant value irrespective of the update, or are changed to values smaller than previous values at each update. . That is, when the initial value of the integrated value is returned to the zero value, the use limit value and the limit notice value may be reduced according to the number of updates, and a constant value exceeding the initial value of the integrated value exceeding the zero value. Alternatively, if the value is set to an increased value for each update, the use limit value and the limit notice value may be initial values or constant values regardless of the update. That is, by narrowing the range between the initial value of the integrated value, the usage limit value, and the limit notice value according to the number of updates, safety is improved.

[0010] In the combustion apparatus of the present invention, the control means prohibits the supply of fuel to the burner based on the notification signal. That is, since the inspection is forced before the usage limit, high safety can be realized.

In the combustion apparatus of the present invention, display means (display 12) for receiving the notification signal and visually or audibly displaying that the integrated value has reached the reference integrated value.
8, speaker 130). With such a display, the user is notified of the arrival of the inspection time,
Encourage an inspection.

Further, the combustion apparatus according to the present invention is characterized in that when the integrated value is returned to an initial value before reaching the limit notice value, the use limit value and the limit notice value are updated. It is possible for the combustion device to fail before reaching the limit warning value. In that case, if inspection and repair are performed, the integrated value is returned to the initial value, and at that time, the usage limit value and the limit notice value are also updated. By doing so, the safety of the combustion equipment is enhanced.

In the combustion apparatus according to the present invention, the return of the integrated value to the initial value can be automatically set by exchanging parts. By automating the return to the initial value, the use limit value and the limit notice value can be updated at the same time, and the safety of the combustion equipment can be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 shows a hot water supply apparatus which is an embodiment of the combustion apparatus of the present invention.

The hot water supply device 2 uses heat of fuel such as gas or petroleum as a heat source, and supplies heat generated by the heat source to clean water.
The water supply pipe 6 and the tapping pipe 8 are connected to each other to form a water channel. A combustion chamber 10 is provided below the heat exchanger 4, and a burner 12 for burning fuel, a flame detector 14, and an igniter 16 are provided here. An exhaust pipe 18 for the combustion gas of the burner 12 is provided above the heat exchanger 4. The exhaust pipe 18 has a C for detecting the concentration of carbon monoxide in the exhaust gas.
An O sensor 20 is provided. Below the burner 12, a fan motor 24 for supplying fuel and combustion air to a suction port 22 of the burner 12 and a fuel nozzle 26 are provided.
The fuel supply pipe 28 is branched on the way, and the burner 12 is provided with two systems of fuel supply. The combustion number of the burner 12 can be switched by opening and closing the switching electromagnetic valve 30. The fuel supply pipe 28 is provided with a proportional valve 32 for adjusting a fuel supply amount to the burner 12 and a fuel source valve 34 for shutting off and supplying fuel. The water supply pipe 6 is provided with a water supply temperature sensor 36 and a water supply amount sensor 38, and the water supply pipe 8 is provided with a water supply temperature sensor 40 and a water amount control valve 42 for regulating and adjusting the water supply amount.
Is provided.

The heat exchanger 4 is configured so as to be detachable from the combustion chamber 10 at a joint portion 44, and the water supply pipe 6 and the tapping pipe 8 are configured to be separable from the heat exchanger 4 at a connection portion 46.

Next, FIG. 2 shows a configuration of the control device 50 and the remote control device 52 in the combustion device of the present invention.

The control unit 50 for performing the combustion control is provided with a control calculation unit 54. The control calculation unit 54 includes a CPU 56 that performs calculation and control, and an R that temporarily stores calculation data and the like.
AM58, operation program of CPU56, usage limit value,
ROM60, which is a read-only memory for storing operation data such as a limit notice value, stores an integrated value of a burning time or the number of times of burning, etc., and protects data erasure from a power failure or the like.
M62, an A / D converter 64 for converting analog data from sensors into digital values is provided, and an input / output circuit 66 as an input / output interface with the sensors is linked by a data bus. The A / D converter 64 is connected to temperature detection circuits 68 and 70, to which the water supply temperature sensor 36 and the tap water temperature sensor 40 are connected, respectively. In addition, the input / output circuit 66 has an input detection circuit 7
2. The water amount detection circuit 74, the flame detection circuit 76, the discharge drive circuit 78, the valve drive circuit 80, the proportional valve drive circuit 82, the original valve drive circuit 84, the valve drive circuit 86, and the transmission / reception circuit 88 are connected, and these are erased. Switch 90, water supply amount sensor 38,
The flame detector 14, the igniter 16, the switching solenoid valve 30, the proportional valve 32, the fuel source valve 34, and the water amount control valve 42 are connected.

A transmission / reception circuit 88 controls bi-directional communication with the remote control device 52, digitally modulates control data from the control operation unit 54, transmits the data by wire or wirelessly, and performs PWM of setting data and the like from the remote control device 52. The signal is demodulated to a digital value.

As means for remotely controlling the control device 50, a remote control device 52 is provided. The remote control device 52 is provided with a control operation unit 100.
0 is a CPU 102 that translates and outputs transmission data from the control operation unit 54 and detects input signals from various setting switches and transmits the data to the control operation unit 54 as setting data;
RAM 10 for temporarily storing setting data, control data, etc.
4. RO storing operation program of CPU 102, etc.
M106, an input / output circuit 108 is provided. I / O circuit 10
8 includes a transmission / reception circuit 110, input detection circuits 112 and 11,
4, 116, a display drive circuit 118, and an audio amplifier 120 are connected, and an operation switch 122, a temperature setting switch 124, a life display switch 126, a display 128, and a speaker 130 as display means are connected to them. By pressing the life display switch 126, the reference integrated value is displayed on the display 128, which can be confirmed.

Next, the life monitoring of the combustion apparatus of the present invention will be described.

The life of a combustion device such as a hot water supply device is often determined by corrosion of a heat exchanger or deterioration of the performance of a CO sensor. For example, in the case of a heat exchanger, dew condensation generated by cooling by water flowing through a water supply pipe corrodes an acidic liquid in which sulfur contained in a combustion gas is dissolved. In addition, it may be broken by metal fatigue caused by repetition of high and low temperatures. In the case of a CO sensor, when thermal degradation due to high temperature progresses, the output voltage value shifts significantly, and the CPU 56
The value cannot be detected. In addition, the thermal history of each part progresses due to the heat history due to the burner combustion. Therefore, the integrated value TN of the combustion time or the number of combustions in which the heat exchanger, the CO sensor, etc. can operate normally is confirmed, and the useful time or the useful number of times is set to the use limit value Dm, and the limit notice value Dp smaller than the use limit value Dm is set. After setting, the inspection is promoted by reaching the limit notice value Dp, and repair such as replacement of consumable parts is promoted.

In the combustion apparatus of the present invention, as a result of the test, the heat exchanger and the CO sensor are used as combustion values for 400 hours as initial values.
It has been confirmed that the apparatus operates without any abnormality up to 100,000 times as the number of combustions for 0 hour.

Here, for example, when the combustion time is 3500 hours or the number of times of burning is 950,000 times, the limit notice value is set as the limit notice value.
Suppress thermal degradation of the heat exchanger or CO sensor. The regulation of the maximum combustion amount can be achieved by regulating the hot water supply capacity of the hot water supply device called the number. The number indicates the heating capacity that can raise 25 liters of water by 1 ° C, and the number calculated by parameters such as tapping water temperature, water supply temperature, water supply amount, and set temperature will exceed the regulation value. When this is done, the fuel quantity given to the burner is fixed to a value corresponding to this maximum value, while fixing it to the maximum value to be restricted. In addition, the regulation of the number can be achieved by limiting the amount of water supply. The number of units can be calculated by the following equation (1) or (2): number of units = (set temperature-supply water temperature) x water supply amount / 25 ... (1) or number of units = (water supply temperature-supply water temperature) x water supply Amount / 25 ... (2)

Therefore, it is necessary to determine the maximum numerical value to be regulated, calculate the maximum water supply amount from each temperature, and regulate the maximum combustion amount by regulating the water supply valve so that the water supply amount does not exceed the maximum class water amount. it can.

The combustion time is defined as the time from when the flame detector 14 detects a flame and rises above a predetermined voltage to when the output value of the flame detector falls below the predetermined voltage due to fire extinguishing, and is integrated. Further, the number of times of combustion is counted using this combustion time as a unit. The burning time or number of burning is EEPRO
It is stored in M62 or the like and is protected from storage erasure due to power failure or the like. The combustion time and the number of combustions stored in the EEPROM 62 each time the combustion is started are copied to the RAM 58, and the combustion time and the number of combustions counted at the time of the combustion are added, and the EEPROM is again used.
The data is transferred to the PROM 62 to update the integrated value of the combustion time and the number of times of combustion. Thus, even if a power failure occurs during combustion, the integrated value of the combustion time or the number of times of combustion up to the previous time is stored in the EEPROM 6.
2 and is used for integrating the subsequent combustion time or number of times of combustion.

Further, when the combustion time or the number of times of combustion reaches the limit notice value as the notice reference integrated value, the maximum combustion amount is regulated, that is, the hot water temperature has not reached the set temperature due to insufficient combustion amount, or the water amount control valve 42. Regulation of hot water supply by
The user can be conscious of the failure and can be prompted for maintenance.

Even if it is notified that the limit notice value has been reached, if the use of the combustion equipment is continued, the integrated value will reach the use limit value. In this case, the CPU
Reference numeral 56 prevents opening of the fuel source valve 34 to forcibly prohibit ignition.

It is notified that the integrated value has reached the limit notice value. After the consumable parts such as the heat exchanger and the CO sensor are replaced based on the notification, the integrated value is initialized by pressing the erase switch 90. At the same time, the restriction on the maximum combustion amount or the restriction on combustion is released, and the usage limit value and the limit notice value are updated. That is, when detecting the input of the erasure switch 90, the CPU 56 erases the integrated value of the burning time and the number of times of burning stored in the EEPROM 62, updates it to a zero value or a constant value as an initial value, and integrates the cumulative time and the number of times of burning. To start. The next use limit value and the limit notice value are read from the ROM 60, and are read out from the RAM 5 as future control values.
8. Transfer to EEPROM 62. The updated usage limit value and limit notice value are set to the same value as the previous value or a value smaller than the previous value. In consideration of a decrease in the durability of the device due to the heat history, it is preferable to set the value to a value smaller than the previous value. For example, the usage limit value after updating is, for example, reducing the burning time from 4000 hours to 3500 hours and the number of times of burning from 100,000 times to 90,000 times.
It has been reduced to 50,000 times. These service limit values and limit notice values are shortened for each update.

The life is updated, that is, the number of times the reference integrated value is updated is limited to, for example, N times, after which combustion is prohibited. This is because deterioration of each part of the combustion equipment progresses, and there is a possibility that the durability cannot be recovered only by replacing parts. In this case, the CPU 56 prohibits all input detection or output and shifts to a pseudo inoperable state by the program. At this time, even if the erase switch 90 is pressed, the inoperable state cannot be released. The operation prohibition data such as the number of lifetime updates is stored and retained in the EEPROM 62, and is retained so as not to be released by reset means for initializing the program operation of the CPU 56 such as power supply stop and reset input.

FIG. 3 is a flowchart showing the operation of the hot water supply apparatus 2 described above.

In step S1, the CPU 56 counts the time from the start of combustion to the end of combustion or the number of times of combustion, and stores the integrated value of the combustion time or number of times of combustion in the EEPROM 62. In step S2, it is determined whether or not the integrated value of the combustion time or the number of times of combustion stored in the EEPROM 62 has reached the limit notice value. If NO, the process proceeds to step S3, and it is determined whether or not the integrated value of the combustion time or the number of times of combustion has reached the limit notice value. If NO, the process proceeds to step S1 to continue integrating the combustion time and the like. If YES, the process moves to step S4.

In step S4, when the integrated value reaches the limit notice value, a notice signal is generated, and the arrival signal is notified by voice or display by this notice signal, and at the same time, the maximum combustion amount is reduced. The maximum combustion amount is regulated to, for example, No. 20 or No. 16 in the case of the hot water supply device of No. 24, and the combustion load is reduced. When the integrated value has reached the use limit value in step S2, the process proceeds to step S5, and combustion is prohibited.

In step S6, the current limit notice value or the usage limit value is added to the update count N up to the previous time stored in the EEPROM 62 and the current count value, and it is confirmed whether or not the maximum update count N has been reached. . If NO, the process proceeds to step S7, and if YES, the process proceeds to step S10.
Move to

In step S7, the input of the erase switch 90 is detected, and it is confirmed whether or not the combustion time and the number of times of combustion accumulated in the EEPROM 62 have been cleared. N
In the case of O, the process proceeds to step S1 to continue the notification of the life, the regulation of the combustion amount, or the prohibition of combustion. In the case of YES, the process shifts to step S8 to cancel the notification of reaching the limit notice value, the restriction on the amount of combustion, or the prohibition of combustion. Subsequently, the process proceeds to step S9, and the limit notice value or the use limit value is updated.

When the number of combustion renewals reaches N in step S6, the process proceeds to step S10. In step S10, the operation of the combustion device is completely prohibited.

FIG. 4 shows time t on the horizontal axis and integrated value TN on the vertical axis.
Of the integrated value TN and the limit notice value Dp or use
This shows the updating of the limit value Dm. In this case, the integrated value TN
Is 0. Dp₁Is the first limit notice value, Dm
₁Is the first usage limit, Dp _TwoIs the second limit notice value, D
m_TwoIs the second usage limit, Dp_ThreeIs the third limit notice value,
Dm_ThreeIs the third usage limit, Dp_FourIs the fourth limit notice
Value, Dm_FourIs the fourth usage limit, and
The person in charge is Dp₁> Dm₁> Dp_Two> Dm_Two> Dp_Three> Dm
_Three> Dp_Four> Dm_FourAnd the number of updates N = 3. Ma
F is a region where the maximum combustion amount is reduced.

Therefore, the combustion apparatus is used from the integrated value TN = 0, and when the preset limit notice value Dp ₁ is reached and notified, the inspection is performed and the integrated value TN is obtained by replacing parts. Is returned to the initial value 0, the second limit notice value Dp ₂ and the second use limit value Dm ₂ are updated. Similarly, the integrated value TN is equal to the limit notice value Dp ₂ or Dp ₃
Is reached, the limit notice value Dp or the use limit value Dm is updated, and the number of updates N = 3 cannot be updated. That is, rather than the generation of the notification signal upon reaching the limit notice value Dp _4, after reaching the operating limit values Dm _4, the ignition prohibition.

Then, as shown in FIG. 5, the integrated value TN is
Limit notice value Dp₁At time A before reaching
In the case of failure, when replacing parts etc. by inspection
Is the first limit notice value Dp₁If you reach and notify
Inspection is performed as in (Time B), and the cost is calculated by replacing parts.
When the value TN is returned to the initial value 0, the second limit notice value D
p _TwoAnd the second use limit value Dm_TwoWill be updated to Also,
Usage limit value Dm₁After reaching, check and replace parts etc.
To return the integrated value TN to the initial value 0, the second
Limit notice value Dp_TwoAnd the second use limit value Dm_TwoUpdate to
Is done.

Next, another embodiment of the combustion apparatus of the present invention will be described. (A) The initial value of the integrated value may be a zero value or a constant value that is increased step by step with each update. (B) The usage limit value and the limit notice value may be set to a fixed value regardless of the update, or may be changed to a value smaller than the previous value at each update. (C) The return of the integrated value to the initial value may be automatically set by replacing parts such as a heat exchanger and a CO sensor or cleaning the fan motor. This can prevent inconvenience caused by forgetting to operate the reset switch such as the erase switch. (D) In the embodiment of the combustion apparatus of the present invention, the combustion amount is regulated when the limit notice value is reached. However, the combustion amount is reduced stepwise several times between the limit notice value and the use limit value. May be. In addition, after the life is updated, the life value is not reduced,
The load due to combustion may be reduced by slightly reducing the maximum combustion amount.

[0042]

As described above, according to the present invention,
The following effects can be obtained. a. After the use limit is announced, the maximum combustion volume is reduced until maintenance is performed to limit the capacity of the combustion equipment, so extreme wear of the equipment is mitigated and the reliability of the equipment up to the use limit is reduced. It can be maintained, limit the performance of the combustion equipment, and prohibit combustion when the service life is reached, thereby urging the user to perform a periodic inspection. b. By erasing the integrated value, a new life can be set in consideration of the aging and the inspection can be prompted in consideration of the failure due to the deterioration of the unreplaced parts, so that the normal operation of the equipment is maintained for a long time be able to. c. Even if a failed part is replaced before the end of its life, if the integrated value is set to the initial value, new limit notice values and use limit values that take into account the use history of the equipment will be reset, and periodic inspections will be performed reliably. It can encourage and maintain safe combustion.

[Brief description of the drawings]

FIG. 1 is a diagram showing a hot water supply apparatus which is an embodiment of a combustion apparatus of the present invention.

FIG. 2 is a block diagram showing a control unit of the hot water supply apparatus which is one embodiment of the combustion apparatus of the present invention.

FIG. 3 is a flowchart showing an operation of the hot water supply apparatus which is one embodiment of the combustion apparatus of the present invention.

FIG. 4 is a diagram showing changes in an integrated value, a limit notice value, and a use limit value in combustion of the combustion device of the present invention.

FIG. 5 is a diagram showing changes in an integrated value, a limit notice value, and a use limit value in combustion of the combustion device of the present invention.

[Explanation of symbols]

 12 burner 50 control device (control means) 128 display (display means) 130 speaker (display means) TN integrated value Dp limit notice value Dm use limit value

Claims (7)

[Claims] 1. A burner for burning fuel, and a heating time or the number of times of combustion are integrated for each combustion operation of the burner, and the integrated value, a use limit value of the burner, and a limit notice value smaller than the use limit value are calculated. When the integrated value reaches the limit notice value, it generates a notification signal indicating the arrival and reduces the maximum combustion amount of the burner, and after the integrated value reaches the service limit value, Control means for prohibiting ignition of the burner.When the integrated value is returned to the initial value, the use limit value and the limit notice value are updated, and the reduced maximum burner amount of the burner is initialized. A combustion device for returning to a state. 2. The combustion apparatus according to claim 1, wherein the initial value of the integrated value is a zero value or a constant value that is increased step by step with each update. 3. The use limit value and the limit notice value are:
2. A constant value is set regardless of update, or is changed to a value smaller than a previous value at each update.
A combustion device as described. 4. The combustion apparatus according to claim 1, wherein the control unit prohibits the supply of fuel to the burner based on the notification signal. 5. The combustion according to claim 1, further comprising display means for receiving the notification signal and visually or audibly displaying that the integrated value has reached the limit notice value. apparatus. 6. The combustion apparatus according to claim 1, wherein when the integrated value is returned to an initial value before the limit notice value is reached, the use limit value and the limit notice value are updated. 7. The combustion apparatus according to claim 1, wherein the return of the integrated value to the initial value can be automatically set by replacing a part.