JP2003207127A - Combustion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus capable of properly setting a target rotating speed of a fan depending on an individual difference in characteristics between fans and in response to an increased closure of a ventilation system. <P>SOLUTION: The combustion apparatus comprises storage means 43 for storing a plurality of correction data corresponding to different fan rotating speed-fan current property (-), (0), (+). A dip switch (selective setting means) 51 is provided for selectively setting the correction data corresponding to the fan rotating speed-fan current property (-), (0), (+) measured for the fan 20 among the plurality of correction data stored in the storage means 43. Fan control means 42 corrects the target rotating speed R<SB>0</SB>of the fan 20 to be increased according to the selectively set correction data for the compensation of a burner 1 for combustion air reduced by the closure of the ventilation system 2 in response to the increased closure of the ventilation system 2 reflected by the change of the fan rotating speed-fan current property. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan provided in a ventilation system including a burner for supplying combustion air to the burner, and a fan rotation speed that matches a target rotation speed according to the combustion amount of the burner. And fan control means for controlling the fan current, and storage means for storing correction data for correcting the target rotation speed of the fan so as to compensate the combustion air to the burner which decreases due to the degree of blockage of the ventilation system. And a correction unit that corrects the target rotation speed of the fan according to the correction data stored in the storage unit according to the change in the fan rotation speed-fan current characteristic that represents the change in the degree of blockage of the ventilation system. It relates to a combustion device.

[0002]

2. Description of the Related Art In a combustion apparatus, the fan current supplied to a fan is controlled so that the fan rotation speed matches a target rotation speed capable of supplying combustion air required for good combustion of a burner. Controlled by. However, if the ventilation system provided with the fan is blocked, the combustion air supplied to the burner will be insufficient even if the fan current is controlled so that the fan speed matches the target speed, and the combustion of the burner Becomes defective.

Therefore, based on the fluctuation of the fan rotation speed-fan current characteristic, which represents the increase in the degree of blockage of the ventilation system, the target rotation speed of the fan is compensated for to compensate the combustion air to the burner which is decreased due to the blockage of the ventilation system. Is increased and corrected. In particular,
When the degree of blockage of the ventilation system increases, the load on the fan decreases, and the fan rotation speed is maintained constant, but the fan current decreases, and the target rotation speed of the fan is reduced according to the reduction in the fan current. Is increased and corrected.

The target rotational speed of the fan is corrected according to the method shown in FIG. At the time of the correction, the auxiliary value line L ₁ and the reference value line L ₂ for determining the auxiliary value I ₁ and the reference value I ₂ (> I ₁ ) according to the fan rotation speed R are respectively provided.
Then, a predetermined coefficient α (0 <α <1) is used.

[0005] First, when the burner in the absence of closure the ventilation system is burned at a maximum combustion amount, to control the fan speed R to the target rotational speed R ₀ in accordance with the maximum combustion amount fan current I is I ₀ '(> I ₂ > I ₁ ).

When the degree of obstruction of the ventilation system increases due to aging of the combustion device or the like, the load on the fan decreases as described above. Therefore, when the fan speed R is controlled to the same target speed R ₀ , the fan Current I falls below the reference value line L ₂ I
_It drops to ₀ (arrow). At this time, the correction value H is the auxiliary value I at the fan current I ₀ and the fan rotation speed R (= R ₀ ).
It is calculated according to the following equation (1) using ₁ , the reference value I ₂ , and the coefficient α.

H = 1 + α {(I ₂ −I ₁ ) / (I ₀ −I ₁ ) −1} (1)

The auxiliary value I ₁ and the reference value I ₂ are set to the fan rotation speed based on experiments so that the combustion of the burner can be maintained well when the fan rotation speed R is corrected according to the above equation (1). It is a value determined in the form of a dependent function.

On this condition, the target rotational speed R without blockage
_The correction coefficient H is multiplied by ₀ to correct the target rotation speed to H · R ₀ . The fan current I is below the reference value line L ₂ ,
Since I ₀ <I ₂ and I ₁ <I _0, the second side of the right side of the above equation (1)
The term becomes positive and the correction value H becomes larger than 1. Therefore,
The target rotation speed R ₀ is increased and corrected. Then, the fan current I is corrected according to the line L ′ representing the fan rotation speed-fan current characteristic corresponding to the correction value H so that the fan rotation speed R matches the corrected new target rotation speed H · R _0. Is done (arrow). As a result, the combustion air reduced due to the increase in the degree of blockage of the ventilation system is compensated for, and the combustion air required for good combustion of the burner is secured.

When the degree of blockage of the ventilation system is further increased, the fan current I is reduced until the correction value H reaches a life line L ″ where the correction value H finally reaches a predetermined threshold value (for example, 1.2) (arrow). In this case, when such a state continues for a predetermined time such as 90 seconds or more, the degree of obstruction of the ventilation system increases to the limit and the combustion device reaches the end of its life, and the combustion of the burner is forcibly stopped.

[0011]

However, even if the fan rotation speed R is the same and the fan current I is different when the ventilation system is not blocked, the fan rotation speed of the fan incorporated in the combustion device minus the fan current. The line L representing the characteristic has individual differences. For example, even if the fan current I ₀ 'is supplied to the fan to control the fan speed to the target speed R ₀ according to the characteristic line L, the actual fan speed may be R ₀ ± ΔR and the target speed R ₀ depending on the fan. It differs from up and down.

Therefore, if a common auxiliary value line L ₁ and reference value line L ₂ are used for all fans,
The individual difference of the fans is also reflected in the correction value H calculated according to the above equation (1) (the difference in length occurs in the arrow in FIG. 5). Therefore, the correction value H is calculated to be too small, and the target rotation speed R _{0 of the} fan to be increased and corrected according to the correction value H becomes too small, even though the degree of obstruction of the ventilation system is greatly increased.
There is a high risk that combustion of the burner will be poor due to lack of combustion air. Further, the drain generated by the combustion of the burner contains a large amount of CO and becomes strong in acidity, and the durability of the portion to which the drain adheres in the combustion device unnecessarily rapidly decreases.

On the other hand, the correction value H is excessively calculated, and the target rotational speed R _{0 of the} fan is increased and corrected according to the correction value H.
Becomes excessively large, the combustion air becomes excessive, and there is a high possibility that an abnormal combustion noise is generated from the burner or lifting occurs. Further, although the degree of obstruction of the ventilation system has not increased to the extent that it has reached the end of its life, it is considered that the correction value H has reached the predetermined formula position, and the combustion of the burner may be forcibly stopped. This necessitates early replacement of the combustion device and is not economical.

Therefore, it is an object of the present invention to provide a combustion device capable of appropriately setting a target rotational speed of a fan in accordance with an individual difference in fan characteristics and an increase in degree of blockage of a ventilation system.

[0015]

In the combustion apparatus of the present invention for solving the above problems, the storage means stores a plurality of the correction data corresponding to different fan rotation speed-fan current characteristics, It is characterized by further comprising selection setting means capable of selectively setting correction data corresponding to a fan rotation speed-fan current characteristic measured for the fan from among the plurality of correction data stored by the storage means. .

According to the present invention, the optimum correction data for the fan can be selectively set according to the measurement result of the fan rotation speed-fan current characteristic. Then, by correcting the target rotation speed of the fan in accordance with the correction data that has been selected and set, it is possible to appropriately compensate for the shortage of combustion air due to the increase in the degree of blockage of the ventilation system. As a result, it is possible to prevent a situation in which the combustion air becomes insufficient and the combustion of the burner becomes defective. Further, it is possible to suppress a situation in which an excessive combustion air causes an abnormal combustion sound from the burner or lifting occurs.

Further, when the life of the combustion device is judged according to the correction data, by selecting and setting the appropriate correction data, the life of the combustion device is reached even though the degree of obstruction of the ventilation system has not increased so much. It is possible to avoid a situation in which it is erroneously determined to have occurred.

[0018] In the present invention, the storage unit includes a fan current I ₀ when the fan is controlled to the target rotational speed R _0, is determined according to the target rotational speed R _0, fan current I ₀ When the target rotational speed R ₀ is lower than this, the correction coefficient H is calculated as an increasing function having a deviation from a reference value I _{2 serving} as a threshold value for increasing correction of the target rotational speed, and then the target rotational speed R ₀ is calculated. It is characterized by storing correction data for correcting to H · R ₀ by multiplying by a correction coefficient H.

Further, in the present invention, the storage means is
The fan has the target speed R₀Fan when controlled by
Current I₀And the target rotation speed R₀Assistance determined according to
Value I ₁And the target speed R₀Determined according to
Fan current I₀Is below this, the target speed R₀
Is a reference value I that is a threshold for increasing correction.₂And a predetermined coefficient α
Based on (0 <α <1), the correction coefficient H is calculated by the equation (1).       H = 1 + α {(I₂-I₁) / (I₀-I₁) -1} (1) According to the target rotation speed R₀Correction coefficient H
By multiplying by HR₀Store the correction data
It is characterized by

In the present invention, the selection setting means is a switch provided on a circuit board on which a circuit related to combustion control of the burner is mounted.

According to the present invention, the setting can be easily changed only by switching the switch provided in the combustion device at the time of shipping the combustion device.
Further, if an existing switch is used for the combustion device in the selection setting, it is not necessary to add a new switch, so that the manufacturing cost can be reduced.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a combustion apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a configuration explanatory view of a combustion device of the present embodiment, and FIGS. 2 to 4 are functional explanatory diagrams of the combustion device of the present embodiment.

The combustion apparatus shown in FIG. 1 is a hot water supply apparatus and includes a burner 1, a ventilation system 2 including the burner 1, a fan 20 provided in the ventilation system 2 for supplying combustion air to the burner 1, and a water passage 3. And a control unit 4 for controlling the hot water supply operation based on the setting of the hot water supply temperature of the remote controller 40 and the like.

The burner 1 burns the gas supplied through the gas passage 11 by being ignited by the igniter 13 through the ignition electrode 12, and the state of the combustion flame is detected by the flame rod 14. In the gas passage 11, from the upstream side to the downstream side, the energization is controlled by the original solenoid valve 111 and the control unit 4, and the opening degree according to the energization amount is exhibited.
A governor proportional solenoid valve 112 for continuously adjusting the amount of gas flowing through the gas passage 11 is provided.

The ventilation system 2 is a combustion chamber 21 for housing the burner 1.
Of the burner 1 installed in the upper part of the combustion chamber 21 from an intake port 22 provided in the lower part of the burner 1 for sucking combustion air into the burner 1.
Is formed by an air path to the exhaust port 23 through which the combustion exhaust from The fan speed R for the fan 20
A rotation speed sensor 24 for measuring is connected.

The water passage 3 is connected to a water supply (not shown) on the upstream side, a heat exchange water passage 32 is connected to the water supply passage 31 on the upstream side, and is connected to the heat exchange water passage 32 on the upstream side. Hot water supply channel 33 connected to a faucet (not shown) and water supply channel 3
It is composed of a bypass passage 34 that branches from 1 and joins the hot water supply passage 33. An electric water amount control device 35, which is electrically controlled by the control unit 4 and controls the amount of water flowing through the heat exchange water passage 32 and the amount of water flowing through the bypass passage 34, is provided at a branch position between the water supply passage 31 and the bypass passage 34. ing.

A water quantity sensor 311 for outputting a signal corresponding to the quantity of flowing water in order from the upstream to the downstream in the water supply passage 31,
Water supply thermistor 312 that outputs a signal according to the water supply temperature
Is provided. In the heat exchange passage 32, the combustion chamber 21
Among them, the water is heated by the combustion exhaust of the burner 1 via the heat exchanger 321 provided above the burner 1 and having the fins 322 to become hot water. A hot water outlet temperature thermistor 323 that outputs a signal according to the hot water outlet temperature is provided downstream of the heat exchanger 321 in the heat exchange water passage 32. A hot water supply temperature thermistor 331 that outputs a signal corresponding to the hot water supply temperature is provided downstream of the position where the hot water supply path 33 merges with the bypass path 34.

The control unit 4 sets the target combustion amount of the burner 1 based on the hot water supply temperature set by the remote controller 40, and controls the combustion amount of the burner 1 so as to match the target combustion amount. And the target rotation speed of the fan 20 is set according to the target combustion amount, and the rotation speed sensor 24
The fan control means 42 that controls the fan current so that the fan rotation speed R measured by
And a storage means 43 for storing correction data for correcting the target rotation speed of the fan 20 so as to compensate the combustion air to the burner 1 which decreases due to the degree of blockage of the ventilation system 2, and the degree of blockage of the ventilation system 2. Correction unit 44 that corrects the target rotation speed of the fan 20 according to the correction data stored in the storage unit 43 according to the change in the fan rotation speed-fan current characteristic that represents the change in

The storage unit 43, the fan rotational speed differs as shown in FIG. 2 - fan current characteristic line L _- (two-dot chain line), L ₀ (solid line), 3 types of fans having a L ₊ (dashed line) Auxiliary value line L _1- (two-dot chain line), L corresponding to
₁₀ (solid line), (dashed line) L _1+, reference value line L _2-(two-dot chain line), L ₂₀ (solid line), 3 kinds composed of L ₂₊ (dashed line), and the correction data (- ), (0), and (+) are stored. In the circuit board 50 on which the CPU or the like that constitutes the control unit 4 is mounted, the correction corresponding to the fan speed-fan current characteristic measured for the fan 20 from the plurality of correction data stored by the storage unit 43. A dip switch (selection setting means) 51 capable of selectively setting data is provided. Initially, the correction data (0) is selectively set by the dip switch 51.

Regarding the function of the combustion device having the above-described structure, FIG.
This will be described with reference to FIG.

First, when the faucet is opened, water flows through the water passage 3, and when the amount of flowing water measured by the flowing water amount sensor 311 exceeds a predetermined amount, the burner 1 starts combustion.
At this time, since the hot water having the hot water supply temperature set by the remote controller 40 is supplied, the target combustion amount of the burner 1 is set by the combustion control means 41. In addition, the fan control means 42
Sets the target rotation speed of the fan 20 according to the target combustion amount of the burner 1, and then controls the fan rotation speed R to match the target rotation speed. Further, the combustion control unit 41 controls the gas supply amount from the gas passage 11 to the burner 1 by controlling the energization amount of the governor proportional solenoid valve 112 according to the fan rotation speed R controlled by the fan control unit 42. .
The gas supplied to the burner 1 is ignited by the igniter 13 via the ignition electrode 12, and the combustion air is supplied from the fan 20 to burn the burner 1. The water flowing through the heat exchange water passage 32 due to the combustion and exhaust of the burner 1 becomes the heat exchanger 3
It is heated via 21 to become hot water, and is supplied to the outside via the hot water supply passage 33. Then, the combustion control means 41 appropriately changes the target combustion amount of the burner 1 so that the hot water supply temperature measured by the hot water supply thermistor 331 matches the set value.

Since the ventilation system 2 is not blocked, the burner 1
Is burned at the maximum combustion amount, and the fan 20 is controlled to the target rotation speed R ₀ according to the maximum combustion amount, the characteristics of the fan 20 are (−), (0), and (+). Is determined. Specifically, when the fan rotation speed R is controlled to the target rotation speed R ₀ , the fan current I is I _0- ', I ₀₀ ', I _{0 +} '(I _0- '<I shown in FIG. ₀₀ '<I
_{It is} determined whether the fan 20 has (-), (0), or (+) characteristics depending on which one of ₀₊ ') is the closest.

Then, based on the judgment result, a dip
Three kinds of correction data (-) through the switch 51,
Either (0) or (+) can be selectively set. This makes it possible to selectively set the auxiliary value lines L _{1− to} L ₁₊ , the reference value lines L _{2 to} L _2+, etc. used when correcting the target rotational speed of the fan 20.

The fan 20 has characteristics (-), (0), (+).
In either case, the procedure for correcting the target rotation speed of the fan 20 is basically the same as the above-described conventional technique (see FIG. 5). However, the present invention has the following advantages because the target rotation speed of the fan 20 is corrected according to the correction data according to each characteristic.

First, the advantage that the target rotation speed R ₀ is corrected according to the correction data (+) instead of the correction data (0) when the fan 20 has the characteristic (+) will be described with reference to FIG. When the degree of blockage of the ventilation system 2 increases while the fan rotation speed R is controlled to the target rotation speed R ₀ , the fan current I falls below the reference value line L ₂₊ (dashed line) to I ₀ (arrow). ). At this time, the fan current I ₀ , the auxiliary value line L ₁₊ (dotted line) corresponding to the characteristic (+), the auxiliary value I _{1+ at} the fan speed R ₀ of the reference value line L ₂₊ (dotted line), the reference value The correction value H ₊ is calculated according to the following equation (2) using I ₂₊ and the coefficient α (0 <α <1).

H ₊ = 1 + α {(I ₂₊ −I ₁₊ ) / (I ₀ −I ₁₊ ) −1} (2)

The auxiliary value I ₁₊ and the reference value I ₂₊ are the fan speed R of the fan 20 having the characteristic (+) according to the above equation (2).
Is a value determined in a form that depends on the fan rotation speed R based on an experiment so that the combustion state of the burner 1 is favorably maintained when is corrected. On this, the target rotation speed R ₀ in the state where there is no blockage is multiplied by the correction coefficient H ₊ , and the target rotation speed is increased and corrected to H ₊ · R ₀ . Then, the fan current I is controlled to increase by the fan control means 42, and the fan rotation speed R is controlled so as to match the new target rotation speed H ₊ · R ₀ (arrow).

Thereafter, the fan current I decreases until the life line L ₊ "(dotted line) where the degree of blockage of the ventilation system 2 further increases and the correction value H ₊ reaches a predetermined threshold value (for example 1.2) (arrow). If such a state continues for a predetermined time or longer, it is considered that the combustion device has reached the end of its life, and the combustion control means 41 forcibly stops the combustion of the burner 1.

The fan current I is the reference value line L₁₊(One-dot chain
Line) and L_TenIntermediate with (solid line) (point p ₁)
(Refer to the arrow), the correction data remains (0).
And the fan current I is a reference value corresponding to the correction data (0).
In L₂₀Since it is not below (solid line), target speed
R₀As a result, the fan rotation speed R is not increased and corrected. one
However, if the correction data is set to (+) at this time,
Reference value line for fan current I according to correction data (+)
L₂₊Since it is below (dashed line), the fan speed R
H₊・ R₀Is corrected to increase. Therefore, the fan 20 is
If it has the property (+), the correction data is not (0)
By setting it to (+), it is reflected in the decrease in fan current I.
Combustion air reduced by increasing the degree of blockage of the ventilation system 2
To prevent the burner 1 from burning poorly.
You can

When the fan current I falls below the reference value line L ₂₀ (solid line) corresponding to the correction data (0) and drops to I ₀ (see arrow), if the correction data remains (0), the fan Current I ₀ , auxiliary value line L ₁₀ (solid line) corresponding to characteristic (0), reference value line L ₂₀ (solid line) at fan rotation speed R ₀ , auxiliary value I ₁₀ , reference value I ₂₀ , and coefficient α
The correction value H ₀ is calculated according to the following equation (2) using (0 <α <1).
Is calculated.

H ₀ = 1 + α {(I ₂₀ −I ₁₀ ) / (I ₀ −I ₁₀ ) −1} (1 ′)

The auxiliary value I ₁₀ and the reference value I ₂₀ are obtained by the above equation (1 ').
When the fan speed R of the fan 20 having the characteristic (0) is corrected in accordance with the above, a value determined in a form dependent on the fan speed R based on experiments so that the complete combustion state of the burner 1 is maintained. Is.

On this condition, the target rotational speed R without blockage
_By multiplying ₀ by the correction coefficient H ₀ , the target rotational speed is H ₀ · R ₀
Is corrected to increase. Then, the fan control unit 42 controls the fan current I to increase, and the fan rotation speed R is controlled to match the new target rotation speed H ₀ · R ₀ (dotted arrow ').

The correction coefficient H ₀ is smaller than the correction coefficient H ₊ .
According to FIG. 3, this is I ₂₀ −I ₀ <I ₂₊ −I ₀ , I ₀ −I ₁₀
> I ₀ −I _1+, so (I ₂₀ −I ₀ ) / (I ₀ −I ₁₀ ) <
It is clear from (I ₂₊ −I ₀ ) / (I ₀ −I ₁₊ ). Therefore, the fan rotation speed H ₀ · R _{0 that} is increased and corrected according to the correction data (0) is smaller than the fan rotation speed H ₊ · R ₀ that is increased and corrected according to the correction data (+). Therefore, if the correction data remains (0), the ventilation system 2
The combustion air reduced due to the increase in the degree of obstruction is not sufficiently compensated, and the combustion of the burner 1 may become defective. On the other hand, if the correction data is set to (+), the fan rotation speed R is corrected to be larger than that when the correction data is (0), and the burner 1 is sufficiently compensated for the decreased combustion air.
Can maintain good combustion.

When the fan current I further decreases (see arrow), the combustion of the burner 1 is finally forcibly stopped because the combustion device has reached the end of its life (see point p ₂ ). At this time, if the correction data remains (0), the combustion of the burner 1 is forced only when the fan current I decreases to the life line L ₀ ″ (solid line: point p ₂ ′) corresponding to the correction data (0). On the other hand, if the correction data is set to (+), the combustion of the burner 1 is forcibly stopped (at the point p ₂ ) before the fan current I decreases to the point p ₂ ′. By setting the correction data to (+) instead of (0), the combustion of the burner 1 is still continued with the degree of blockage of the ventilation system 2 increased to the extent that it is judged that the life has been reached. As a result, it is possible to avoid a situation in which hot water having a temperature lower than the set value is supplied and the user feels uncomfortable due to poor combustion of the burner 1 and eventually insufficient combustion amount.

When the fan 20 has the characteristics (+) and (0), the correction data is set to (+) and (0) instead of (-) through the dip switch 51. The advantages of

Next, the advantage that the target rotational speed R ₀ is corrected according to the correction data (−) instead of the correction data (0) when the fan 20 has the characteristic (−) will be described with reference to FIG. When the fan rotation speed R is controlled to the target rotation speed R ₀ and the degree of blockage of the ventilation system 2 increases, the fan current I falls below the reference value line L _2- (two-dot chain line) to I ₀ ( Arrow). At this time, the fan current I ₀ , the auxiliary value line L ₁₋ corresponding to the characteristic (−), and the reference value line L ₂₋
Auxiliary value I ₁₋ at fan rotation speed R ₀ (two-dot chain line),
The correction value H ₋ is calculated according to the following equation (3) using the reference value I ₂₋ and the coefficient α (0 <α <1).

H ₋ = 1 + α {(I _{2 −} −I ₁₋ ) / (I ₀ −I ₁₋ ) −1} (3)

The auxiliary value I ₁₋ and the reference value I ₂₋ are the fan speed R of the fan 20 having the characteristic (−) according to the above equation (3).
Is a value determined in a form that depends on the fan rotation speed R based on an experiment so that the combustion state of the burner 1 is favorably maintained when is corrected.

On this condition, the target rotational speed R without blockage
₀ is multiplied by the correction coefficient H ₋ to obtain the target rotation speed H ₋ · R ₀
Is corrected to increase. Then, the fan control means 42 controls the fan current I to increase, and the fan rotation speed R is controlled to match the new target rotation speed H ₋ · R ₀ (arrow).

[0051] Thereafter, the ventilation system 2 of the closure of further increased by the correction value H _- becomes a predetermined threshold value life line L _- "fan current I is reduced to (two-dot chain line) (arrow), it takes the state given If it continues for more than a time, it is considered that the combustion device has reached the end of life, and the combustion control means 41 forcibly stops the combustion of the burner 1.

The fan current I is the reference value line L₂₀(solid line)
And L_2-(Point p) ₁)
(Refer to the arrow), the correction data remains (0).
And the fan current I is a reference value corresponding to the correction data (0).
In L₂₀Since it is below (solid line), the fan speed R is
H₀・ R_oIs corrected to increase. On the other hand, at this time
If the data is set to (-), the fan current I will
Reference value line L corresponding to the data (-)_2-(Dashed line) down
Since it is not rotating, the fan speed R is not increased and corrected.
Therefore, when the fan 20 has the characteristic (-), the correction data is
By setting the data to (-) instead of (0),
I of time (R₀), The fan current I has dropped so much
Even if the degree of obstruction of the ventilation system 2 does not increase so much
Regardless, the fan speed R is increased and corrected, and the combustion air is
It is possible to avoid an excessive situation. This allows
Abnormal combustion noise generated from burner 1 due to excessive combustion air
Also, lifting can be suppressed. Also burning
The user of the device feels an abnormal burning noise, and it is easy to use.
It can avoid the situation that the image of being bad is given
It

When the fan current I falls below the reference value line L ₂₀ corresponding to the correction data (0) and drops to I ₀ (see arrow), the correction data remains (0) as described above. The fan rotation speed R is controlled so as to match the target rotation speed H ₀ · R ₀ (dotted line arrow ').

Since the correction coefficient H ₋ is smaller than the correction coefficient H ₀ similarly to the magnitude relationship between the correction coefficients H ₀ and H ₊ , the fan rotation speed H ₋ · R which is increased and corrected according to the correction data (−)
₀ is smaller than the fan speed H ₀ · R ₀ that is increased and corrected according to the correction data (0). Therefore, if the correction data remains (0), the combustion air reduced due to the increase in the degree of blockage of the ventilation system 2 is excessively compensated, the combustion air becomes excessive, and the burner 1 emits an abnormal combustion noise. Lifting may occur. On the other hand, if the correction data is set to (−), the fan rotation speed R is corrected to be smaller than that when the correction data is (0), and the combustion air is not increased more than necessary, and the burner is not increased. It is possible to prevent the occurrence of abnormal combustion noise from 1 and lifting.

When the fan current I further decreases (see arrow), the combustion of the burner 1 is finally forcibly stopped because the combustion device has reached the end of its life (see point p ₂ ). At this time, if the correction data remains (0), the life line L ₀ ″ (point p ₂ ') corresponding to the correction data (0) is reached before the fan current I reaches the original life line L ₋ ″. The combustion of the burner 1 is forcibly stopped only when it decreases. On the other hand, if the correction data is set to (-), the fan current I becomes
First combustion burner 1 is forcibly stopped decreases to the point p ₂ further lower than ₂ '. Therefore, by setting the correction data to (-) instead of (0), the combustion of the burner 1 is forcibly stopped in a state where the degree of blockage of the ventilation system 2 has not increased to the extent that it is determined that the life has been reached. It is possible to avoid the situation. As a result, it is possible to avoid the uneconomical situation in which the combustion device must be replaced more quickly than necessary.

When the fan 20 has the characteristics (-) and (0), the correction data is set to (-) and (0) instead of (+) through the dip switch 51. The advantages of

In the present embodiment, the DIP switch 51 is adopted as the "selection setting means" for the correction data, but any other type of switch capable of selecting and setting the correction data may be adopted as another embodiment. In addition, the control unit 4 of the combustion apparatus is configured to be able to communicate with an external host computer, and the correction data is selected and set by operating the keyboard or mouse of the host computer, and then the host computer makes a selection to the control unit 4. Is transmitted and the control unit 4 selects one correction data from the plurality of correction data stored in the storage means 43, and then the target rotation speed R _{0 of the} fan 20 is selected according to the correction data. It may be corrected.

Further, the control unit 4 of the combustion apparatus is constructed so as to be able to communicate with an external host computer, and the correction data is determined by operating the keyboard or mouse of the host computer, and then the control unit 4 is transferred from the host computer to the control unit 4. The target rotation speed R _{0 of the} fan 20 may be directly transmitted and corrected according to the correction data.

Although three types of correction data are selectable in this embodiment, four or more types of correction data may be selectable as another embodiment.

In this embodiment, the fan current I ₀ and the auxiliary value I
_{Although the} correction coefficient H is calculated by the above equation (1) using ₁ , the reference value I ₂ and the coefficient α, as another embodiment, when the fan current I is below the reference value I ₂ , the fan rotation speed is reduced. R
The correction coefficient H may be calculated such that (= R ₀ ) is increased and corrected to H · R ₀ (H> 1).

In the present embodiment, the coefficient α is characteristic (0),
A common one is used for all the fans 20 regardless of the difference between (−) and (+), but different coefficients may be adopted for each characteristic as another embodiment.

For example, when the exhaust port 23 is intentionally closed to increase the degree of blockage of the ventilation system 2 and the fan rotation speed R is corrected to be increased accordingly, it is judged whether the combustion state of the burner 1 is good or bad. After that, the correction data may be selectively set by the dip switch 51. On the other hand, dip
After the correction data is selectively set by the switch 51, the degree of obstruction of the ventilation system 2 is intentionally increased, and when the fan rotation speed R is correspondingly increased and corrected, it is determined whether the combustion state of the burner 1 is good or bad. Good. In the latter case, the suitability of the correction data selected and set previously can be determined. Whether the combustion state of the burner 1 is good or bad is determined, for example, according to whether the combustion value (= CO generation amount / CO ₂ generation amount) is less than a predetermined value.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a configuration of a combustion device according to this embodiment.

FIG. 2 is a functional explanatory diagram of the combustion device of the present embodiment.

FIG. 3 is a functional explanatory diagram of the combustion device of the present embodiment.

FIG. 4 is a functional explanatory view of the combustion device of the present embodiment.

FIG. 5 is a functional explanatory diagram of a conventional combustion device.

[Explanation of symbols]

1 ... Burner, 2 ... Ventilation system, 20 ... Fan, 41 ... Combustion control means, 42 ... Fan control means, 43 ... Storage means, 44
Compensation means, 50 Circuit board, 51 Dip switch (selection setting means)

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H021 AA01 BA06 BA11 BA20 CA03                       CA04 CA07 CA09 CA10 DA04                       EA10 EA11 EA12                 3H045 AA06 AA09 AA12 AA26 AA31                       BA12 BA28 BA31 CA06 CA09                       CA21 CA23 CA29 DA05 EA36                       EA38                 3K003 JA04 JA12 KA05                 5H550 AA08 AA20 BB08 DD01 GG03                       GG05 JJ17 LL22 LL48

Claims (4)

[Claims] 1. A fan provided in a ventilation system including a burner for supplying combustion air to the burner, and a fan current is controlled so that the fan rotation speed matches a target rotation speed according to the combustion amount of the burner. Fan control means, storage means for storing correction data for correcting the target rotational speed of the fan so as to compensate the combustion air to the burner which decreases due to the degree of blockage of the ventilation system, and A combustion device comprising: a fan rotation speed that represents a change in the degree of blockage; and a correction unit that corrects a target rotation speed of the fan according to correction data stored by the storage unit according to a change in a fan current characteristic, The storage means stores a plurality of the correction data corresponding to different fan rotation speed-fan current characteristics, and selects one of the correction data stored in the storage means for the fan. Fan speed is measured Te - combustion apparatus characterized by comprising a selection configurable selection setting means the correction data corresponding to the fan current characteristics. Wherein said storage means includes a fan current I ₀ when the fan is controlled to the target rotational speed R _0, is determined according to the target rotational speed R _0, fan current I ₀ is the same When the target rotation speed R ₀ is decreased, the correction coefficient H is calculated as an increasing function with a deviation from a reference value I _{2 serving} as a threshold value for increasing correction, and then the target rotation speed R ₀ is corrected. The combustion device according to claim 1, wherein correction data for correcting to H · R ₀ by storing is stored. Wherein said storage means includes a fan current I ₀ when the fan is controlled to the target rotational speed R _0, the auxiliary value I ₁ determined according to the target rotational speed R _0, also It is determined according to the target rotational speed R _0, the reference value I ₂ which the target rotation speed R ₀ is increased corrected by the threshold value when the fan current I ₀ falls below this predetermined coefficient α (0 <α < 1) and the correction coefficient H is calculated according to the equation (1) H = 1 + α {(I ₂ −I ₁ ) / (I ₀ −I ₁ ) −1} (1) R ₀ is the correction coefficient H
The combustion device according to claim 1, wherein correction data for correcting to H · R ₀ by storing is stored. 4. The combustion apparatus according to claim 1, 2 or 3, wherein the selection setting means is a switch provided on a circuit board on which a circuit related to combustion control of the burner is mounted.