JP3080017B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a combustion apparatus for burning fuel.

[0002]

2. Description of the Related Art Conventionally, this type of combustion apparatus is disclosed in
No. 01834 and JP-A-6-213432 are generally used. These devices used a frame rod 1 and a burner head 2 as shown in FIG. The frame rod 1 has a groove 1a formed on the surface of the electrode as shown in FIG. 13 (a), or an auxiliary rod 1b at the tip of the electrode as shown in FIG. 13 (b). Processing such as welding was performed. The fuel is vaporized by the heater 4 in the vaporization cylinder 3, is ejected from the nozzle 5, is mixed with air at the same time, passes through the inside of the burner head 2, ignites when passing through the plurality of flame holes 6, and ignites the flame 7. Form. The frame rod 1 was mounted on a fixed base 10 by a mounting bracket 9 via an insulator 8 made of ceramic, and the tip was arranged so as to contact the flame 7.
Further, a DC voltage power supply and a current detecting means 1 are provided between the frame rod 1 and the burner head 2 as a voltage supplying means 11.
As 2, the ammeter was connected. The ignition is performed by an ignition means 13. For example, the ignition rod 14 is attached to the fixed base 10 by a mounting bracket 16 via an insulator 15 made of ceramic, and a high voltage is applied by an AC voltage power supply 17. In general, a spark discharge is generated between the tip of the burner and the burner head 2 to ignite.

With the above configuration, a DC current flowing when a constant DC voltage is supplied between the flame rod 1 and the burner head 2 is detected, a combustion state is determined from the current value, and combustion is controlled by the combustion control means 18. I was able to control it. In general, the combustion flame 7 contains many ions and electrons generated by thermal ionization. If a current flows when a voltage is supplied between the flame rod 1 and the burner head 2, ignition occurs. The presence or absence of the flame 7 can be detected. Further, the current greatly depends on combustion conditions such as the oxygen concentration in the combustion air, and the current decreases when incomplete combustion occurs due to a decrease in the oxygen concentration. Judgment was made for complete combustion, and as a safety measure, combustion control was performed by issuing an alarm such as a buzzer or lamp to encourage ventilation, or forcibly stopping combustion.

[0004] When organic silicone contained in a hairdressing material or the like is present in the combustion air, an insulating silicon oxide film is formed on the surface of the frame rod 1 and the burner head 2, and the gap between the frame rod 1 and the burner head 2 is formed. Since the current flowing through the combustion device is apparently small, there is a possibility that abnormal combustion may be detected in spite of normal combustion. However, according to this combustion device, the groove 1a is formed in the frame rod 1 or the auxiliary rod 1b It is said that the combustion state can be detected without being affected by the organosilicone because the steel has been subjected to processing such as welding. FIG.
When the groove 1a is provided on the surface as shown in FIG.
19A. Since the scattered silicon does not enter into the inside of the substrate, no silicon oxide film is formed and the current does not decrease. Further, as shown in FIG.
When b is welded, even if silicon oxide is formed,
Since the two metals have different coefficients of thermal expansion, cracks and pits occur on the surface due to temperature changes, and that part becomes a new conducting part, and the current does not decrease so that the combustion state can be detected stably. I have.

[0005]

However, in the conventional combustion apparatus, the combustion state is detected by using an electric current, and processing is performed on the frame rod 1 to improve the silicone resistance. Since the decrease in the current due to the formation of the coating largely depends on the burner head 2 having a relatively large surface area instead of the frame rod 1, even if the frame rod 1 is processed, the current gradually increases due to the formation of the silicon oxide coating. If the amount of the silicon oxide film decreases and the amount of the silicon oxide film increases, a detection error of abnormal combustion may occur even though the combustion is normal, and the combustion control such as forcibly stopping the combustion may perform an incorrect operation. There was a problem that.

Further, the frame rod 1 and the burner head 2 on which the silicon oxide film is formed need to be replaced each time, and there is a problem that it is not economical.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a burner head that burns fuel, a frame rod that comes into contact with internal flame generated by a flame, and a space between the burner head and the frame rod. Voltage applying means for applying a voltage to the current, current detecting means for detecting a current flowing between the burner head and the frame rod, and first potential detecting means for detecting the potential of charged particles in contact with the inner flame. And a second potential detecting means for detecting a potential of the charged particles by contacting with an inner flame different from the inner flame, wherein the first potential detecting means and the second potential detecting means detect different potentials of the charged particles. It is a combustion device. Regardless of the presence or absence of silicon oxide on the flame rod surface, that is, regardless of the magnitude of the current, the potential distribution of the charged particles between the flame rod and the burner head has a constant correlation with the current during normal combustion. Relationships are maintained. However, the small shape
In the case of combustion where multiple flames are formed, the shape of the internal flame is small.
And the frame rod and the first and second potential detecting means
It is difficult to come into contact with the same enditis. The present invention
Even in the case of combustion such as
The frame rod and the first potential detecting means.
The stage is brought into contact with the same internal flame, and the second electric potential detection
By contacting the steps, the potential of the charged particles in
Can be detected. Therefore, multiple small internal flames are formed.
In this case, a combustion state such as ignition or misfire can be detected without being affected by the adhesion of silicon oxide , using the above-described correlation .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a burner head for burning fuel, a frame rod which comes into contact with internal flame generated by a flame, and voltage applying means for applying a voltage between the burner head and the frame rod. Current detecting means for detecting a current flowing between the burner head and the frame rod, first potential detecting means for detecting the potential of charged particles in contact with the inner flame, and an inner flame different from the inner flame. contact
And second potential detecting means for detecting the potential of the charged particles , and wherein the first potential detecting means and the second potential detecting means detect different potentials of the charged particles.

[0009] Regardless of the presence or absence of silicon oxide on the surface of the flame rod, that is, regardless of the magnitude of the current, the potential distribution of the charged particles between the flame rod and the burner head is not affected by the current if the combustion is normal. A constant correlation is maintained between them. The present invention is smaller inner flame shapes plural form
Even in the case of combustion that is formed, the small flaming flames electrically connect to each other.
The frame rod and the first potential detecting means.
The stage is brought into contact with the same internal flame, and the second electric potential detection
By contacting the steps, the potential of the charged particles in
Can be detected. Therefore, even in such a case,
Using the relation, it is possible to detect a combustion state such as ignition or misfire without being affected by silicon oxide adhesion.

[0010] Further, there is provided a first potential difference detecting means for detecting a first potential difference (V12) between the first potential detecting means and the second potential detecting means.

[0011] Strictly speaking, the potential is defined as the work required to carry charged particles from infinity to that position, and it is difficult to measure the potential. However, in this configuration, the first potential detecting means and the second potential detecting means are not used. Since the first potential difference (V12) is detected, it can be easily measured using an ordinary voltmeter. This first potential difference
Similarly to the potential, (V12) maintains a constant correlation with the current if the combustion is normal, regardless of the magnitude of the current. Therefore, by detecting the first potential difference (V12), it is possible to easily detect a combustion state such as an ignition state or a misfire state without being affected by silicon oxide adhesion.

A first calculating means for calculating a flame impedance (R12) by using a first potential difference (V12) and a current between the first potential detecting means and the second potential detecting means; and the flame impedance (R12). Control means for controlling combustion by means of

The flame impedance (R12) is the flame impedance between the equipotential surface in contact with the first potential detecting means and the equipotential surface in contact with the second potential detecting means, and is obtained by the first calculating means. This flame impedance is an essential quantity that indicates the combustion state because it greatly depends on the density and mobility of charged particles generated by combustion, and does not depend on the magnitude of the current. preferable. This flame impedance (R12) is, as described above,
Since it does not depend on the magnitude of the current, the combustion state can be detected without being affected by the adhesion of the silicon oxide, and the combustion can be appropriately controlled, such as by stopping the combustion, by the control means for controlling the combustion in accordance with the flame impedance (R12).

Further, a first potential difference detecting means for detecting a first potential difference (V12) between the first potential detecting means and the second potential detecting means, and a second potential difference between the burner head and the second potential detecting means. V2b) is provided.

The first potential difference (V12) maintains a constant correlation with the current during normal combustion regardless of the magnitude of the current. Therefore, by detecting the first potential difference (V12), it is possible to easily detect a combustion state such as an ignition state or a misfire state without being affected by silicon oxide adhesion. Further, since the second potential difference (V2b) is the second potential difference (V2b) between the burner head and the potential of the second potential detecting means, when the silicon oxide adheres to the burner head, a large voltage at the silicon oxide portion is generated. A potential drop is also included. Therefore, by detecting the second potential difference (V2b), the adhesion of silicon oxide to the burner head can be detected. In this configuration, since both the first potential difference (V12) and the second potential difference (V2b) can be detected at the same time, the combustion state is detected without being affected by silicon oxide adhesion by the first potential difference (V12),
On the other hand, the second potential difference (V2b) makes it possible to monitor the deposition of silicon oxide on the burner head.

A first calculating means for calculating a flame impedance (R12) by using a first potential difference (V12) and a current between the first potential detecting means and the second potential detecting means; and the flame impedance (R12). Control means for controlling combustion by means of a second electric potential difference (V2b) between the burner head and the second electric potential detection means.
Calculating means for calculating an apparent flame impedance (R2b) between the burner head and the second potential detecting means using the current and the current, and first monitoring for monitoring silicon oxide deposition by the apparent flame impedance (R2b). Means.

Since the flame impedance (R12) obtained by the first calculation means does not depend on the magnitude of the current, the combustion state can be detected without being affected by the adhesion of silicon oxide, and the combustion impedance can be detected in accordance with the flame impedance (R12). The first control means for controlling the combustion can appropriately control the combustion such as stopping the combustion. In addition, the apparent flame impedance (R2b) obtained by the second calculating means includes the impedance due to the silicon oxide adhesion when the silicon oxide adheres to the burner head. it can. In this configuration, since both the flame impedance (R12) and the apparent flame impedance (R2b) can be detected at the same time, the combustion using the first control means is not affected by the silicon oxide adhesion by the flame impedance (R12). At the same time, the combustion can be controlled while monitoring the deposition of silicon oxide on the burner head by the apparent flame impedance (R2b).

Further, a first potential difference detecting means for detecting a first potential difference (V12) between the first potential detecting means and the second potential detecting means, and a third potential difference between the frame rod and the first potential detecting means (V12). Vf1) is provided.

The first potential difference (V12) maintains a constant correlation with the current during normal combustion regardless of the magnitude of the current. Therefore, by detecting the first potential difference (V12), it is possible to easily detect a combustion state such as an ignition state or a misfire state without being affected by silicon oxide adhesion. Since the third potential difference (Vf1) is the third potential difference (Vf1) between the potential of the frame rod and the potential of the first potential detecting means, when the silicon oxide adheres to the frame rod, a large potential difference in the silicon oxide portion occurs. A potential drop is also included. Therefore, by detecting the third potential difference (Vf1), the adhesion of silicon oxide to the frame rod can be detected. In this configuration, since both the first potential difference (V12) and the third potential difference (Vf1) can be detected at the same time, the combustion state is detected without being affected by silicon oxide deposition by the first potential difference (V12), and Thus, it is possible to monitor the adhesion of silicon oxide to the frame rod by the third potential difference (Vf1).

A first calculating means for calculating a flame impedance (R12) using a first potential difference (V12) and a current between the first potential detecting means and the second potential detecting means; and the flame impedance (R12). And a third potential difference (Vf) between the flame rod and the first potential detecting means.
(1) a third calculating means for calculating an apparent flame impedance (Rf1) between the flame rod and the first potential detecting means using the current; and a third calculating means for monitoring the deposition of silicon oxide by the apparent flame impedance (Rf1) . 2 is provided with monitoring means.

Since the flame impedance (R12) obtained by the first calculation means does not depend on the magnitude of the current, the combustion state can be detected without being affected by the adhesion of the silicon oxide, and the combustion impedance can be detected in accordance with the flame impedance (R12). The control means for controlling the combustion can appropriately control the combustion such as stopping the combustion. Further, the apparent flame impedance (Rf1) obtained by the third calculating means includes the impedance due to the silicon oxide adhesion when the silicon oxide adheres to the frame rod, so that the silicon oxide adhesion is detected. it can. In this configuration, since both the flame impedance (R12) and the apparent flame impedance (Rf1) can be detected at the same time, the combustion using the first control means is not affected by the silicon oxide adhesion by the flame impedance (R12). At the same time, the combustion can be controlled while monitoring the adhesion of silicon oxide to the flame rod by the apparent flame impedance (Rf1).

[0022]

Embodiments of the present invention and reference examples will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. In addition, parts not essential to the present invention, such as the vaporizing cylinder 3, are omitted in the drawings.

[0023] (Reference Example 1) FIG. 1 is a sectional view showing the structure of a combustion apparatus of Example 1 of the present invention. Generally, a mixed gas in which gaseous fuel is mixed with secondary air having a theoretical combustion air amount or less in advance is ejected from a plurality of flame holes 6 and burned. An inner flame 7a is formed by a combustion reaction with the primary air, and an outer flame 7b is formed outside the inner flame by a combustion reaction with the secondary air from the surroundings. The inner flame 7a
The outer flame 7b becomes a nearly transparent burning flame and forms the entire flame 7 visually. One end of the frame rod 1 is in contact with charged particles generated by the flame 7, and the other end is connected to the burner head 2 via the voltage applying means 11.
It is connected to the. Here, the inner flame 7a looks bright and bright visually, and contains many charged particles (ions and electrons). However, even if the density near the inner flame 7a and the outer flame 7b is small, the charged particles are not charged. Exists. When the charged particles are negligibly small, for example, when the flame 7 is not present, that is, when the combustion is stopped, a voltage of 10 to 30 V is applied to the flame rod 9 and the burner head 2 by the voltage applying means 11. However, almost no current flows. However, even when the flame rod 1 is arranged at a position several mm away from the internal flame 7a in a normal combustion state, a current of several μA or more flows when the above voltage is applied. This means that the enditis 7a
Indicates that charged particles also exist in the vicinity of. The current flowing between the frame rod 1 and the burner head 2 is detected by, for example, current detection means 19 obtained from the voltage across a resistor having a constant resistance value. Of course, the current detection means 19 may use an ammeter instead of a resistor.

The first potential detecting means 20 is arranged at a position close to the frame rod 1, and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is fixed via the insulator 8. When a current flows between the flame rod 1 and the burner head 2, there is a potential gradient between the two and the current flows spatially in a spread manner. Exist orthogonal to. Both at the position of the first potential detecting means 20 and at the position of the second potential detecting means 21, there are equipotential surfaces that come into contact with each other. The first potential detecting means 20 is provided for the frame rod 1
, And thus electrically contacts the equipotential surface far from the burner head 2. On the other hand, the second
Since the potential detecting means 21 is arranged at a position far from the frame rod 1, the potential detecting means 21 contacts the equipotential surface at a position closer to the burner head 2 in terms of potential. Thus, the first potential detecting means 20 and the second potential detecting means 21 detect different potentials of charged particles. The frame rod 1, the first potential detecting means 20 and the second potential detecting means 21 have a diameter of 1 to 2 m.
m high heat-resistant metal wire is frequently used.

When silicon oxide is formed only on one end surface of the frame rod 1 which comes into contact with the charged particles,
Since the silicon oxide is insulating, the current is significantly reduced, even under normal combustion conditions. But,
If the current decreases but the combustion is normal, the flame rod 1
It is clear that a constant potential gradient corresponding to the current value exists between the burner head 2 and the burner head 2, and an equipotential surface also exists. That is, assuming that the flame impedance between the burner head 2 and the equipotential surface in contact with the first potential detecting means 20 is Rb1, the current when no silicon oxide is formed is Ii, and the current when the silicon oxide is formed is Isi, In the case of combustion, the flame impedance (Rb1) is the same. Therefore, the potential of the first potential detecting means 20 when the silicon oxide is not formed is (the potential of the burner head 2 + Rb1 * I
i), and the same potential when formed is (the potential of the burner head 2 + Rb1 * Isi). Flame impedance
Since (Rb1) is obtained from the normal potential and the current Ii,
If a potential (potential of the burner head 2 + Rb1 * Isi) corresponding to the value of the current Isi during the formation of the silicon oxide is detected, it can be detected that the combustion state is normal, and the detected potential is (burner head 2). Potential + Rb1 * Isi),
It can be detected that the combustion is not normal. Therefore, it is clear that the combustion state can be detected even when a small current Isi flows due to the formation of silicon oxide.

The potential of the second potential detecting means 21 is also
Except that the flame impedance between the burner head 2 and the equipotential surface in contact with the second potential detecting means 21 is Rb2,
This is exactly the same as the case of the potential of the first potential detecting means 20.
For example, the potential of the second potential detecting means 21 when silicon oxide is formed is (the potential of the burner head 2 + Rb2 * I
si).

When silicon oxide is formed only on the surface of the burner head 2, the situation is exactly the same except that the potential of the flame rod 1 is used as a reference.

If silicon oxide is formed on both the surface of the frame rod 1 and the surface of the burner head 2, a potential drop occurs due to the silicon oxide formed on the surface, so that the above-described effects cannot be expected. However, the potential difference between the potential of the first potential detecting means 20 and the potential of the second potential detecting means 21 is expressed as [(potential of burner head 2 + potential of burner head 2+
Rb1 * Isi)-(potential of burner head 2 + Rb2 * Isi) =
(Rb1−Rb2) * Isi], the potential difference is independent of the potential of the burner head 2. Therefore, the same potential difference is determined independently of the formation of silicon oxide on the surface of the burner head 2. On the other hand, since Rb1 and Rb2 are obtained in advance in the normal combustion state, it is clear that the combustion state can be detected based on whether or not the same potential difference is the same potential according to Isi. Since this is exactly the same with reference to the potential of the flame rod 1, even when silicon oxide is formed on the surface of the flame rod 1 and the surface of the burner head 2, it is necessary to monitor the same potential difference. By
The combustion state can be detected.

Embodiment 1 FIG. 2 is a sectional view showing the structure of Embodiment 1 of the present invention.

One end of the frame rod 1 has an internal flame 7
a, and the other end is connected to the burner head 2 via the voltage applying means 11. One end of the first potential detecting means 20 is connected to the same inner flame 7 in contact with the frame rod 1.
a. The second potential detecting means 21 is disposed at a position where the second electric potential detecting means 21 comes into contact with the internal flame 7 a different from the internal flame 7 a which is in contact with the frame rod 1. As described above, the internal flame 7a looks bright and shining visually, and includes many charged particles (ions and electrons). Therefore, even if the same voltage is applied between the frame rod 1 and the burner head 2 by the voltage applying means 11, more current can flow in the configuration of FIG. 2 than in the configuration of FIG.

The size and height of each internal flame 7a vary greatly depending on the amount of combustion and the shape of the flame hole. In the case of a domestic combustor, when the diameter becomes 3 mm or less and the height becomes 1 mm or less. There is also. As described above, when the flame rod 7, the first potential detecting means 20, and the second potential detecting means 21 cannot be placed in contact with the same internal flame 7 a because the internal flame 7 a is small, as shown in FIG. 2. The frame rod 1 and the first
It is preferable that the potential detecting means 20 is brought into contact with the same internal flame 7a and the second potential detecting means 21 is brought into contact with a different internal flame 7a.

An electric current is applied to the inner flame 7 which comes into contact with the frame rod 1.
a through the second potential detecting means 21
There is also a small amount of current flowing through the other end flame 7a that comes into contact with the inner flame 7a. This is because charged particles exist in both the inner flame 7a and the outer flame 7b, and the inner flame 7a and the outer flame 7b are electrically connected. This indicates that an equipotential surface having the same potential as the potential detected by the second potential detecting means 21 in the inner flame 7a also exists in the other inner flame 7a. Therefore, the relationship between the potential on the equipotential surface and the current detected by the second potential detecting means 21 is the same as that in the configuration of FIG. 1 regardless of the presence or absence of silicon oxide, even when the internal flame 7a is small. An equivalent effect can be obtained.

(Embodiment 2 ) FIG. 3 is a sectional view showing the structure of Embodiment 2 of the present invention.

One end of the frame rod 1 is provided with an internal flame 7.
a, and the other end is connected to the burner head 2 via the voltage applying means 11. One end of the first electric potential detecting means 20 and one end of the second electric potential detecting means 21 are arranged at positions where they come into contact with the same inner flame 7a which is in contact with the frame rod 1.

When the internal flame 7a is large, the configuration shown in FIG. 3 is preferable. This is because the flame rod 1, the first potential detecting means 20, and the second potential detecting means 21 are arranged at positions near each other in a field where the flow of combustion, the number of charged particles, and the like are uniform. First potential detecting means 20 and second potential detecting means 2
The relationship between the potential on the equipotential surface and the current detected by 1 is the same as that of the configuration in FIG. 1 regardless of the presence or absence of silicon oxide formation. Further, since a large amount of current flows between the frame rod 1 and the burner head 2, the potential detection of the charged particles becomes easy. Also, there is an advantage that as the current increases, the electrical insulation of the frame rod 1, the first potential detecting means 20 and the second potential detecting means 21 may be lower.

(Embodiment 2 ) FIG. 4 is a sectional view showing the configuration of Embodiment 2 of the present invention.

One end of the frame rod 1 has a flame 7
, And the other end is connected to the burner head 2 via the voltage applying means 11. First potential detecting means 2
Numeral 0 is arranged at a position close to the frame rod 1 and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is fixed via the insulator 8. The other end of the first potential detecting means 20 and the other end of the second potential detecting means 21 are connected to the first potential difference detecting means 22, and are connected to the equipotential surface in contact with the first potential detecting means 20 and the second potential detecting means 21. A first potential difference (V12) between the contacting equipotential surfaces is detected. As the first potential difference detecting means 22, for example, a voltmeter is used.

Up to now, the first potential detecting means 20 and the second
Although the potential detected by the potential detecting means 21 has been used, it is preferable that the first potential difference (V12) be detected by the first potential difference detecting means 22 as shown in FIG. This first
The potential difference (V12) is the product of the impedance (R12 = Rb1-Rb2) between the equipotential surface that contacts the first potential detecting means 20 and the equipotential surface that contacts the second potential detecting means 21, and the current (I). Equal (V
12 = R12 * I). Therefore, if normal combustion, impedance
Because (R12) is constant, the potential difference in the normal combustion state can be easily obtained from the current (I). The silicon oxide is formed on both the surface of the frame rod 1 and the surface of the burner head 2, and which is formed more largely depends on the configuration of the combustor and the amount of combustion. However, the first potential difference (V12) (= R12 * I) in the present configuration is independent of the potential of the burner head 2 and the potential of the frame rod 1, so that even if silicon oxide is formed on the surface of the burner head 2, , Formed on the surface of the frame rod 1,
First potential difference (V12) corresponding to current (Isi) flowing at that time
(= R12 * Isi) is observed.

(Embodiment 3 ) FIG. 5 is a sectional view showing the structure of Embodiment 3 of the present invention.

One end of the frame rod 1 has a flame 7
, And the other end is connected to the burner head 2 via the voltage applying means 11. First potential detecting means 2
Numeral 0 is arranged at a position close to the frame rod 1 and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is fixed via the insulator 8. The other end of the first potential detecting means 20 and the other end of the second potential detecting means 21 are connected to the first potential difference detecting means 22, and are connected to the equipotential surface in contact with the first potential detecting means 20 and the second potential detecting means 21. A first potential difference (V12) between the contacting equipotential surfaces is detected. First potential difference
(V12) and the current (I) are input to the first calculating means 23, and the flame impedance (R1) between the equipotential surface in contact with the first potential detecting means 20 and the equipotential surface in contact with the second potential detecting means 21.
2) is calculated. The first control means 24 controls combustion such as stopping combustion based on the flame impedance (R12).

Up to now, the first potential detecting means 20 and the second
The potential detected by the potential detecting means 21 or the first potential difference (V
Although 12) has been used, it is preferable that the flame impedance (R12) is calculated by the first calculating means 23 as shown in FIG. This flame impedance (R12)
Is the flame impedance between the equipotential surface contacting the first potential detecting means 20 and the equipotential surface contacting the second potential detecting means 21 as described above. In normal combustion, the flame impedance (R12) is constant and is an essential amount determined by the density and mobility of charged particles, and therefore does not depend on the current (I). When the flame impedance (R12) becomes larger than a certain value, the first control means 24 can control combustion such as stopping combustion. The flame impedance (R12) in this configuration is determined by the potential of the burner head 2 and the flame rod 1
Irrespective of the potential of the flame, regardless of whether silicon oxide is formed on the surface of the burner head 2 or on the surface of the flame rod 1, a flame impedance (R12) corresponding to the combustion at that time is observed. .

Current (I) and first potential difference when kerosene obtained by adding about 200 ppm (weight concentration) of silicone oil to normal kerosene using a household petroleum fan heater
FIG. 6 shows the change over time of (V12).

First, normal kerosene is burned for about 5 minutes, and then the kerosene to which the silicone oil has been added is burned continuously for about 6 hours, and the current (I) and the first potential difference (V12) change with time. The change was measured. Voltage application means 1
As 1, a DC power supply (24 V) was used.

The current is about 80 during the initial normal kerosene combustion.
μA, but decreased rapidly with the lapse of time during burning of kerosene to which silicone oil had been added.
(About 40% of the initial current value). It has been separately confirmed that both the normal kerosene combustion and the kerosene combustion with the addition of silicone oil are almost normal combustion both optically and electrically. After this measurement, formation of white deposits composed of Si and oxygen was confirmed on both the surface of the frame rod 1 and the surface of the burner head 2. From these, the current is
It is clear that despite normal combustion, it is reduced by the formation of silicon oxide.

On the other hand, the first potential difference (V12) was about 0.19 V during the combustion of normal kerosene in the initial stage, but decreased with the lapse of time during the combustion of kerosene to which silicone oil was added. .11V (about 58% of the initial potential difference value). Flame impedance (R12 = V12 / I) is about 2.5kΩ
Therefore, when the current (I) is reduced to 30 μA, the first potential difference (V12) is expected to show 0.075V. The actually measured final first potential difference (V12) was about 0.11 V, which was about 1.47 times the expected value. Although the details of this cause are unknown, it is considered to be due to non-linearity in the current (I) -first potential difference (V12) characteristic. However, the current is about 1/2.
7, the first potential difference (V
Combustion state detection using 12) is clearly more stable against silicon oxide formation than conventional current detection.

The stability to the formation of silicon oxide is more apparent when evaluated by the flame impedance (R12) as shown below. The total impedance (R) between the frame rod 1 and the burner head 2 depends on the current value and the DC power supply (24
V), it was initially about 300 kΩ, increased with the passage of time, and finally reached about 800 kΩ (about 2.7 times the initial value). However, the flame impedance (R12
= V12 / I) was initially about 2.5 kΩ, but ultimately only increased to about 3.7 kΩ (about 1.47 times the initial value). FIG. 7 shows the change with respect to the elapsed time in both cases. K = (1 / Ri)
(△ R / △ t). Where Ri: initial resistance value, ΔR:
The resistance value changed during the time Δt (about 6 hours). As is clear from the figure, the increase rate of the flame impedance (R12) with respect to the elapsed time is about 6.7% / hour, and the total impedance
The rate of increase of (R) was about 28% / hour. Thus, the combustion state detection using the first potential difference (V12) and the flame impedance (R12) is more than four times as stable as silicon oxide formation as compared with the conventional detection using the current (I).

( Embodiment 3) FIG. 8 is a sectional view showing the structure of Embodiment 3 of the present invention.

One end of the frame rod 1 has a flame 7
, And the other end is connected to the burner head 2 via the voltage applying means 11. First potential detecting means 2
Numeral 0 is arranged at a position close to the frame rod 1 and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is fixed via the insulator 8. The other end of the second potential detecting means 21 and the burner head 2 are connected to the second potential difference detecting means 2.
5 and a second potential difference (V2b) between the potential of the second potential detecting means 21 and the potential of the burner head 2 is detected.

Since the second potential difference (V2b) is the potential difference between the equipotential surface contacting the second potential detecting means 21 and the burner head 2, when the silicon oxide is formed on the burner head 2, the second potential difference (V2b) The two potential differences (V2b) include a large potential drop in the silicon oxide part. Since the potential drop in the silicon oxide portion increases as the amount of the oxide attached increases, the amount of silicon oxide attached can be detected by detecting the second potential difference (V2b). Is better.

(Embodiment 4 ) FIG. 9 is a sectional view showing the structure of Embodiment 4 of the present invention.

One end of the frame rod 1 has a flame 7
, And the other end is connected to the burner head 2 via the voltage applying means 11. First potential detecting means 2
Numeral 0 is arranged at a position close to the frame rod 1 and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is attached to the fixed base 10 via the insulator 8. The other end of the second potential detecting means 21 and the burner head 2 are connected to a second potential difference detecting means 25, and a second potential difference (V2b) between the potential of the second potential detecting means 21 and the potential of the burner head 2 is detected.

The second potential difference (V2b) and the current (I) are inputted to the second calculating means 26, and the apparent flame impedance (R2b) between the equipotential surface in contact with the second potential detecting means 21 and the burner head 2 is obtained. ) Is calculated. Based on the apparent flame impedance (R2b), the second control means 27 controls combustion such as stopping combustion. This apparent flame impedance (R2
b) is the flame impedance between the equipotential surface contacting the second potential detecting means 21 and the burner head 2 as described above. Therefore, when the silicon oxide is formed on the burner head 2, the apparent flame impedance (R2b) includes the impedance caused by the silicon oxide portion.
The impedance at this silicon oxide portion increases as the amount of the oxide attached increases, so the apparent flame impedance (R2b) can be directly detected to detect the amount of silicon oxide attached. This configuration is excellent.

Under the same conditions as those measured in FIG. 6 and FIG. 7, the current when burning kerosene obtained by adding about 200 ppm (weight concentration) of silicone oil to normal kerosene using a domestic petroleum fan heater was used. FIG. 10 shows the change over time of I) and the second potential difference (V2b).

First, normal kerosene is burned for about 5 minutes, and then the kerosene to which the silicone oil has been added is burned continuously for about 6 hours, and the current (I) and the second potential difference (V2b) change with time. The change was measured. Voltage application means 1
As 1, a DC power supply (24 V) was used.

The current was about 80 during the initial normal kerosene combustion.
μA, but decreased rapidly with the lapse of time during burning of kerosene to which silicone oil had been added.
(About 37% of the initial current value). This current (I)
It is evident that the decrease in the decrease is due to the formation of silicon oxide.

On the other hand, the second potential difference (V2b) was about 6 V during the initial combustion of normal kerosene, but increased with the passage of time during the combustion of kerosene to which silicone oil was added. (About 1.8 times the potential difference value). The initial value of the apparent flame impedance (R2b = V2b / I) is about 75 kΩ, so that the silicon oxide is burner head 2
, The second potential difference (V2b) when the current (I) is reduced to 30 μA is expected to show about 2.2V. However, the actually measured final second potential difference (V2b) was about 11 V, which was about five times higher than the expected value. Although the details of this cause are unknown, it is considered that silicon oxide is formed on the surface of the burner head 2 and the potential drop in the silicon oxide portion is also included in the second potential difference (V2b). While the current decreased to about 1 / 2.7 or less, the second potential difference (V2b) increased by about 5 times the expected value, so the second potential difference (V2b) was used. Combustion state sensing is more sensitive to silicon oxide formation than conventional current sensing.

The sensitivity to the formation of silicon oxide is clearer when evaluated by the flame impedance (R2b) as shown below. The total impedance (R) between the flame rod 1 and the burner head 2 depends on the current value and the DC power
(24V), which was initially about 300 kΩ, increased with the passage of time, and finally reached about 800 kΩ (about 2.7 times the initial value). However, the apparent flame impedance (R2b = V2b / I) was initially about 75 kΩ, but eventually increased to about 350 kΩ (about 4.7 times the initial value). FIG. 11 shows the change with respect to the elapsed time in both cases. The increase rate (k) of the impedance with respect to the elapsed time is defined in the same manner as in FIG. As is clear from the figure, the increase rate of the apparent flame impedance (R2b) with respect to the elapsed time
(k) is about 60% / hour, rate of increase of total impedance (R) (k)
Was about 28% / hour, the former being more than twice as sensitive to silicon oxide deposition as the latter. From this, the second potential difference (V2b) and apparent flame impedance (R2b)
The detection of the combustion state by using is more than twice as sensitive to the formation of silicon oxide as compared with the conventional detection using current (I).

(Embodiment 5 ) FIG. 12 is a sectional view showing the structure of Embodiment 5 of the present invention.

One end of the frame rod 1 has a flame 7
, And the other end is connected to the burner head 2 via the voltage applying means 11. First potential detecting means 2
Numeral 0 is arranged at a position close to the frame rod 1 and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed to the fixed base 10 via the insulator 8 similarly to the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is fixed via the insulator 8. The other end of the first potential detecting means 20 and the burner head 2 are connected to a third potential difference detecting means 28, and a third potential difference (Vf1) between the potential of the first potential detecting means 20 and the potential of the frame rod 1 is detected.

Since the third potential difference (Vf1) is a potential difference between the equipotential surface in contact with the first potential detecting means 20 and the frame rod 1, when the silicon oxide is formed on the frame rod 1, the third potential difference (Vf1) The potential difference (Vf1) includes a large potential drop in the silicon oxide portion. Since the potential drop in the silicon oxide portion increases as the amount of the oxide attached increases, the amount of the silicon oxide attached to the surface of the frame rod 1 can be reduced by detecting the third potential difference (Vf1). This configuration is excellent in that it can be detected.

(Embodiment 6 ) FIG. 13 is a sectional view showing the structure of Embodiment 6 of the present invention.

One end of the frame rod 1 has a flame 7
, And the other end is connected to the burner head 2 via the voltage applying means 11. First potential detecting means 2
Numeral 0 is arranged at a position close to the frame rod 1 and one end thereof is in contact with charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Similarly, the second potential detecting means 21 is fixed via the insulator 8. The other end of the first potential detecting means 20 and the frame rod 1 are connected to a third potential difference detecting stage 2.
8, a third potential difference (Vf1) between the potential of the first potential detecting means 20 and the potential of the frame rod 1 is detected.

The third potential difference (Vf 1) and the current (I) are inputted to the third calculating means 29, and the apparent flame impedance (Rf 1) between the equipotential surface contacting the first potential detecting means 20 and the frame rod 1. Is calculated. The third control means 30 controls combustion such as stopping combustion based on the apparent flame impedance (Rf1). This apparent flame impedance (Rf
1) is the flame impedance between the equipotential surface contacting the first potential detecting means 20 and the frame rod 1 as described above. Therefore, the silicon oxide is the flame rod 1
When formed, the apparent flame impedance (Rf1)
Includes the resistance caused by the silicon oxide portion. Since the impedance at the silicon oxide portion increases as the amount of the oxide attached increases, the apparent flame impedance (Rf1) is detected to reduce the amount of the silicon oxide attached to the surface of the frame rod 1. This configuration is excellent in that it can be directly detected.

Under the same conditions as those measured in FIG. 6 and FIG. 7, the current when burning kerosene obtained by adding about 200 ppm (weight concentration) of silicone oil to normal kerosene using a household petroleum fan heater was used. The changes over time of I) and the third potential difference (Vf1) were measured, and the same results as those shown in FIGS. 10 and 11 were obtained.

(Embodiment 4 ) FIG. 14 is a sectional view showing the configuration of Embodiment 4 of the present invention.

One end of the frame rod 1 has a flame 7
And the other end is contacted with the voltage applying means 11
Is connected to the burner head 2. The first potential detecting means 20 is arranged at a position close to the frame rod 1, and one end thereof is in contact with the charged particles. The first electric potential detecting means 20 is, like the frame rod 1, made of the insulator 8
Has been fixed through. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Second potential detecting means 21
Are similarly fixed via the insulator 8. The other end of the first potential detecting means 20 and the other end of the second potential detecting means 21 are connected to the first potential difference detecting means 22, and the first potential of the first potential detecting means 20 and the potential of the second potential detecting means 21 The potential difference (V12) is detected. The other end of the second potential detecting means 21 and the burner head 2 are connected to a second potential difference detecting means 25, and the potential of the second potential detecting means 21 and the second potential difference (V2b) of the burner head 2 are detected.

In this configuration, two potential differences of the first potential difference (V12) detected by the first potential difference detecting means 22 and the second potential difference (V2b) detected by the second potential difference detecting means 25 are detected simultaneously. . The first potential difference (V12) is defined by the equipotential surface contacting the first potential detecting means 20 and the second potential detecting means 21.
Therefore, even if silicon oxide is formed on the surface of the burner head 2 or the surface of the frame rod 1, a potential difference corresponding to the current (I) flowing at that time is detected. You. On the other hand, the second potential difference (V2b)
Equipotential surface in contact with potential detecting means 21 and burner head 2
When the silicon oxide is formed on the surface of the burner head 2, the second potential difference (V2b) includes a large potential drop in the silicon oxide portion. Since the potential drop in the silicon oxide portion increases as the amount of the oxide attached increases, the amount of the silicon oxide attached to the surface of the burner head 2 is detected by detecting the second potential difference (V2b). Can be detected.

As described above, in this configuration, the second potential difference (V2
The method is superior in that the amount of silicon oxide deposited on the surface of the burner head 2 can be monitored by b), while the combustion state can be monitored by the first potential difference (V12). The amount of silicon oxide attached increased extremely, and the current (I) was several μA accordingly.
If it decreases below, it becomes difficult to detect the current (I) itself. In such a case, even if it is determined that the combustion state is normal due to the first potential difference (V12), if the amount of silicon oxide deposited on the surface of the burner head 2 detected by the second potential difference (V2b) becomes a certain amount or more. Appropriate combustion control such as stopping combustion can be performed.

(Embodiment 5 ) FIG. 15 is a sectional view showing the structure of Embodiment 5 of the present invention.

One end of the frame rod 1 has a flame 7
And the other end is contacted with the voltage applying means 11
Is connected to the burner head 2. The first potential detecting means 20 is arranged at a position close to the frame rod 1, and one end thereof is in contact with the charged particles. The first electric potential detecting means 20 is, like the frame rod 1, made of the insulator 8
Has been fixed through. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. Second potential detecting means 21
Are similarly fixed via the insulator 8.

The other end of the first potential detecting means 20 and the other end of the second potential detecting means 21 are connected to the first potential difference detecting means 22, and the potential of the first potential detecting means 20 and the second potential detecting means 2
A first potential difference (V12) of one potential is detected. First potential difference
(V12) and the current (I) are input to the first calculating means 23, and the flame impedance (R1) between the equipotential surface in contact with the first potential detecting means 20 and the equipotential surface in contact with the second potential detecting means 21.
2) is calculated. The first control means 24 controls combustion such as stopping combustion based on the flame impedance (R12).

The other end of the second potential detecting means 21 and the burner head 2 are connected to the second potential difference detecting means 25, and the potential of the second potential detecting means 21 and the second potential difference (V2b) of the burner head 2
Is detected. The second potential difference (V2b) and the current (I) are inputted to the second calculating means 26, and the apparent flame impedance (R2b) between the equipotential surface in contact with the second potential detecting means 21 and the burner head 2 is calculated. You. Based on this apparent flame impedance (R2b) , the first monitoring means 27
Monitor deposits.

In this configuration, the flame impedance (R12) calculated by the first calculating means 23 and the second calculating means 2
Apparent flame impedance calculated by 6 (R2b)
Are simultaneously detected. The flame impedance (R12) is the flame impedance between the equipotential surface contacting the first potential detecting means 20 and the equipotential surface contacting the second potential detecting means 21, so that the surface of the burner head 2 and the flame rod 1 Even if silicon oxide is formed on the surface of the substrate, it shows a constant value in normal combustion. On the other hand, the apparent flame impedance (R2b) is the flame impedance between the equipotential surface in contact with the second potential detecting means 21 and the burner head 2, so that when the silicon oxide is formed on the surface of the burner head 2, The apparent flame impedance (R2b) includes a large impedance in the silicon oxide part. Since the impedance at the silicon oxide portion increases as the amount of the oxide attached increases, the apparent flame impedance (R2b) is detected to determine the amount of the silicon oxide attached to the surface of the burner head 2. Can be monitored .

As described above, in the present configuration, while the amount of silicon oxide deposited on the surface of the burner head 2 is monitored by the apparent flame impedance (R2b), the combustion state is directly controlled by the flame impedance (R12). It is excellent in that it can be monitored. If the amount of silicon oxide attached increases extremely and the current (I) correspondingly decreases to several μA or less, the detection of the current (I) itself becomes difficult. In such a case, even if it is determined that the combustion state is normal by the flame impedance (R12), if the amount of silicon oxide adhering to the surface of the burner head 2 detected by the apparent flame impedance (R2b) becomes a certain amount or more. In addition, appropriate combustion control can be performed without stopping the combustion.

(Embodiment 6 ) FIG. 16 is a sectional view showing a configuration of Embodiment 6 of the present invention.

One end of the frame rod 1 is in contact with charged particles generated by the flame, and the other end is
1 is connected to a burner head 2. The first potential detecting means 20 is arranged at a position close to the frame rod 1, and one end thereof is in contact with the charged particles. The first potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21 is arranged at a position far from the frame rod 1 and one end thereof is in contact with the charged particles. The second potential detecting means 21 also
Similarly, it is fixed via an insulator 8. The other end of the first potential detecting means 20 and the other end of the second potential detecting means 21 are connected to the first potential difference detecting means 22, and the first potential of the first potential detecting means 20 and the potential of the second potential detecting means 21 Potential difference
(V12) is detected. The other end of the first potential detecting means 20 and the frame rod 1 are connected to a third potential difference detecting stage 28, and the potential of the first potential detecting means 20 and the third potential difference (Vf1) of the frame rod 1 are detected.

In this configuration, two potential differences of the first potential difference (V12) detected by the first potential difference detecting means 22 and the third potential difference (Vf1) detected by the third potential difference detecting stage 28 are simultaneously detected. . The first potential difference (V12) is the potential difference between the equipotential surface that contacts the first potential detecting means 20 and the equipotential surface that contacts the second potential detecting means 21, and therefore the surface of the burner head 2 and the frame rod 1 Even if silicon oxide is formed on the surface of the device, a potential difference corresponding to the current (I) flowing at that time is detected. On the other hand, the third potential difference (Vf1) is determined between the equipotential surface contacting the first potential detecting means 20 and the frame rod 1.
When the silicon oxide is formed on the surface of the frame rod 1, the third potential difference (Vf1) includes a large potential drop in the silicon oxide portion. Since the potential drop in the silicon oxide portion increases as the amount of the oxide attached increases, the amount of the silicon oxide attached to the surface of the frame rod 1 is detected by detecting the third potential difference (Vf1). Can be detected.

As described above, in this configuration, the third potential difference (Vf
1) is excellent in that the amount of silicon oxide adhering to the surface of the frame rod 1 is monitored, while the combustion state can be monitored by the first potential difference (V12). If the amount of silicon oxide attached increases extremely and the current (I) correspondingly decreases to several μA or less, the detection of the current (I) itself becomes difficult. In such a case, even if it is determined that the combustion state is normal due to the first potential difference (V12), if the amount of silicon oxide deposited on the surface of the burner head 2 detected by the third potential difference (Vf1) becomes a certain amount or more. Appropriate combustion control such as stopping combustion can be performed.

(Embodiment 7 ) FIG. 17 is a sectional view showing the configuration of Embodiment 7 of the present invention.

One end of the frame rod 1 has a flame 7
The other end is connected to the burner head 2 via the voltage applying means 11. The first potential detecting means 20 is arranged at a position close to the frame rod 1, and one end thereof is in contact with the charged particles. First
The potential detecting means 20 is fixed via an insulator 8 like the frame rod 1. The second potential detecting means 21
It is arranged at a position remote from the frame rod 1, and one end thereof is in contact with the charged particles. Second potential detecting means 21
Are similarly fixed via the insulator 8.

The other end of the first potential detecting means 20 and the other end of the second potential detecting means 21 are connected to the first potential difference detecting means 22, and the potential of the first potential detecting means 20 and the second potential detecting means 2
A first potential difference (V12) of one potential is detected. First potential difference
(V12) and the current (I) are input to the first calculating means 23, and the flame impedance (R1) between the equipotential surface in contact with the first potential detecting means 20 and the equipotential surface in contact with the second potential detecting means 21.
2) is calculated. The first control means 24 controls combustion such as stopping combustion based on the flame impedance (R12).

The other end of the first potential detecting means 20 and the frame rod 1 are connected to a third potential difference detecting stage 28, and the potential of the first potential detecting means 20 and the third potential difference (Vf
1) is detected. The third potential difference (Vf1) and the current (I) are input to the third calculation stage 29, and the apparent flame impedance (Rf1) between the equipotential surface in contact with the first potential detection means 20 and the frame rod 1 is calculated. You. Based on this apparent flame impedance (Rf1) , the second monitoring means 30
Monitor for oxide deposition.

In this configuration, the flame impedance (R12) calculated by the first calculation means 23 and the third calculation stage 29
Of apparent flame impedance (Rf1) calculated by
The flame impedances are detected simultaneously. The flame impedance (R12) is the flame impedance between the equipotential surface contacting the first potential detecting means 20 and the equipotential surface contacting the second potential detecting means 21, so that the surface of the burner head 2 and the flame rod 1 Even if silicon oxide is formed on the surface of the substrate, it shows a constant value in normal combustion. On the other hand, since the apparent flame impedance (Rf1) is the flame impedance between the equipotential surface in contact with the first potential detecting means 20 and the flame rod 1, when the silicon oxide is formed on the surface of the flame rod 1, The apparent flame impedance (Rf1) includes a large impedance in the silicon oxide part. The impedance at the silicon oxide portion increases as the amount of the oxide attached increases, so the apparent flame impedance (Rf1) is detected to determine the amount of the silicon oxide attached to the surface of the frame rod 1. Can be detected.

As described above, in the present configuration, the amount of silicon oxide deposited on the surface of the frame rod 1 is monitored by the apparent flame impedance (Rf1), while the combustion state is directly monitored by the flame impedance (R12). It is excellent in that it can be monitored. If the amount of silicon oxide attached increases extremely and the current (I) correspondingly decreases to several μA or less, the detection of the current (I) itself becomes difficult. In such a case, even if it is determined that the combustion state is normal by the flame impedance (R12), if the amount of silicon oxide deposited on the surface of the burner head 2 detected by the apparent flame impedance (Rf1) becomes a certain amount or more. Appropriate combustion control, such as stopping the combustion, can be performed.

[0085]

As described above, according to the combustion apparatus of the present invention, the following effects can be obtained.

(1) In the case of combustion in which a plurality of internal flames having a small shape are formed, the internal flame shape is small, and it is difficult for both the frame rod and the first and second potential detecting means to contact the same internal flame. In this case, since the plurality of small internal flames are electrically connected to each other, the flame rod and the first potential detecting means are brought into contact with the same internal flame, and the second potential detecting means is brought into contact with a different internal flame. , It is possible to detect the potential of the charged particles in the stomatitis. Regardless of the presence or absence of silicon oxide on the flame rod surface, that is, regardless of the magnitude of the current, the potential distribution of the charged particles between the flame rod and the burner head is constant between the current and the normal combustion. Is maintained. Since the electric potential of the charged particles can be detected by the first electric potential detecting means and the second electric potential detecting means, a combustion state such as an ignition state or a misfire state can be detected without being affected by silicon oxide adhesion.

(2) The first potential difference (V12) between the first potential detecting means and the second potential detecting means is the same as the potential, regardless of the magnitude of the current, if the combustion is normal, between the first potential difference and the current. A certain correlation is maintained. Therefore, by detecting the first potential difference (V12), it is possible to easily detect a combustion state such as an ignition state or a misfire state without being affected by silicon oxide adhesion.

(3) The flame impedance (R12) calculated by using the first potential difference (V12) and the current between the first potential detecting means and the second potential detecting means is used to calculate the density of charged particles generated by combustion and the like. It largely depends on the mobility and does not depend on the magnitude of the current. Therefore, the flame impedance (R12) can detect the combustion state without being affected by the adhesion of the silicon oxide, and the control means for controlling the combustion according to the flame impedance (R12) can appropriately control the combustion such as stopping the combustion.

(4) First potential difference (V12) and second potential difference (V2b)
Are simultaneously detected to obtain the first potential difference (V12).
Thus, the combustion state can be detected without being affected by the deposition of silicon oxide, and on the other hand, the deposition of silicon oxide on the burner head can be monitored by the second potential difference (V2b).

(5) By simultaneously detecting both the flame impedance (R12) and the apparent flame impedance (R2b), the control means can be used without being affected by the adhesion of silicon oxide by the flame impedance (R12). While controlling the combustion, on the other hand, the apparent flame impedance (R2b) can be used to monitor silicon oxide deposition on the burner head.

(6) First potential difference (V12) and third potential difference (Vf1)
Are simultaneously detected to obtain the first potential difference (V12).
Thus, the combustion state can be detected without being affected by the deposition of silicon oxide, and on the other hand, the deposition of silicon oxide on the frame rod can be monitored by the third potential difference (Vf1).

(7) By simultaneously detecting both the flame impedance (R12) and the apparent flame impedance (Rf1), the control means can be used without being affected by the adhesion of silicon oxide by the flame impedance (R12). At the same time as controlling the combustion, on the other hand, the apparent flame impedance (Rf1) can be used to monitor the deposition of silicon oxide on the flame rod.

[Brief description of the drawings]

Cross sectional view of a combustion apparatus of Example 1 of the present invention

FIG. 2 is a sectional view of a main part of the combustion apparatus according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a combustion device according to a second embodiment of the present invention;

FIG. 4 is a sectional view of a main part of a combustion apparatus according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a combustion apparatus according to a third embodiment of the present invention.

FIG. 6 is a characteristic diagram of Example 3 in a kerosene combustion flame to which silicone oil was added.

FIG. 7 is a characteristic diagram of Example 3 in a kerosene combustion flame to which silicone oil was added.

FIG. 8 is a sectional view of a main part of a combustion apparatus according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a main part of a combustion apparatus according to a fourth embodiment of the present invention.

FIG. 10 is a characteristic diagram of Reference Example 4 in a kerosene combustion flame to which silicone oil has been added.

FIG. 11 is a characteristic diagram of Reference Example 4 in a kerosene combustion flame to which silicone oil has been added.

FIG. 12 is a sectional view of a main part of a combustion apparatus according to a fifth embodiment of the present invention.

FIG. 13 is a sectional view of a main part of a combustion apparatus according to Embodiment 6 of the present invention.

FIG. 14 is a sectional view of a main part of a combustion apparatus according to a fourth embodiment of the present invention.

FIG. 15 is a sectional view of a main part of a combustion apparatus according to a fifth embodiment of the present invention.

FIG. 16 is a sectional view of a main part of a combustion apparatus according to a sixth embodiment of the present invention.

FIG. 17 is a sectional view of a main part of a combustion apparatus according to a seventh embodiment of the present invention.

FIG. 18 is a cross-sectional view showing the entire configuration of a conventional combustion device.

19A is a configuration diagram of a main part of a conventional combustion device. FIG. 19B is a configuration diagram of a main portion of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame rod 2 Burner head 7 Flame 7a Inner flame 7b Outer flame 11 Voltage applying means 12 Current detecting means 20 First potential detecting means 21 Second potential detecting means 22 First potential difference detecting means 23 First calculating means 24 First controlling means 25 second potential difference detecting means 26 second calculating means 27 second controlling means 28 third potential difference detecting means 29 third calculating means 30 third controlling means

──────────────────────────────────────────────────続 き Continued on the front page (72) Kunihiro Tsuruta, Inventor 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-10-122559 (JP, A) JP-A-51-83227 (JP, A) JP-A-62-147216 (JP, A) JP-A-62-147217 (JP, A) JP-A-62-255729 (JP, A) JP-A-63-23543 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23N 5/12

Claims (7)

(57) [Claims] 1. A burner head for burning fuel, a frame rod in contact with an internal flame generated by a flame, voltage applying means for applying a voltage between the burner head and the frame rod, current detecting means for detecting a current flowing between the flame rod, said
First potential detecting means for detecting the potential of the charged particles by contacting with the flame; and potential of the charged particles by contacting with an inner flame different from the inner flame
A second potential detecting means for detecting the potential of the charged particles, wherein the first potential detecting means and the second potential detecting means detect different potentials of the charged particles. 2. The combustion apparatus according to claim 1, further comprising first potential difference detecting means for detecting a first potential difference (V12) between the first potential detecting means and the second potential detecting means. 3. A flame impedance R using a first potential difference (V12) and a current between the first potential detecting means and the second potential detecting means.
First computing means for computing 12 and the flame impedance
3. The combustion apparatus according to claim 2, further comprising control means for controlling combustion by R12. 4. A first potential difference detecting means for detecting a first potential difference (V12) between the first potential detecting means and the second potential detecting means,
A second potential difference between the burner head and the second potential detecting means (V2
2. The combustion apparatus according to claim 1, further comprising a second potential difference detecting means for detecting b). 5. A flame impedance using a first potential difference (V12) and a current between the first potential detecting means and the second potential detecting means.
(R12), control means for controlling the combustion by the flame impedance R12, and a second potential difference (V2b) between the burner head and the second potential detection means and the burner head using the current. A second calculating means for calculating an apparent flame impedance (R2b) between the second potential detecting means and a silicon oxide by using the apparent flame impedance (R2b);
2. The combustion apparatus according to claim 1, further comprising a first monitoring means for monitoring the adhesion of the carbide. 6. A first potential difference detecting means for detecting a first potential difference (V12) between the first potential detecting means and the second potential detecting means,
A third potential difference (V) between the frame rod and the first potential detecting means
2. The combustion device according to claim 1, further comprising a third potential difference detecting means for detecting f1). 7. A flame impedance R using a first potential difference (V12) and a current between the first potential detection means and the second potential detection means.
First computing means for computing 12 and the flame impedance
A control means for controlling combustion by R12, and an apparent flame impedance (Rf1) between the flame rod and the first potential detecting means using the third potential difference (Vf1) and the current between the flame rod and the first potential detecting means. A third calculating means for calculating, and a silicon acid based on the apparent flame impedance (Rf1).
2. The combustion apparatus according to claim 1, further comprising a second monitoring means for monitoring the adhesion of the carbide.