JPH0926410A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the detection of burning state for a long period by separating silica stuck on the surface of a flame electrode. SOLUTION: The combustion equipment comprises a combustion sensor 10 for detecting the burning state from the current amount obtained when a voltage is applied between a flame electrode 11 and a burner unit 9 introduced in the burning flame of the unit 9. At the electrode 11 of the sensor 10, even if silica is stuck to the surface of the electrode 11 having a threaded part 12, the silica stuck to the surface can be peeled off due to the thermal expansion and contraction of the uneven part 12 upon reception of the heat of the unit 9. Since the current value can be easily obtained at the electrode 11 by the amount increased in the surface area by the part 12, the accuracy of the sensor 12 can be improved, the silica component can be removed by additional threading at the time of sticking the silica component, and the detecting of the burning state of the sensor 10 can be stably obtained for a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion sensor for a combustion device that burns liquid fuel.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, in a combustion apparatus of this type, fuel is supplied from a cartridge tank 21 to a tank 20, and the fuel in the tank 20 is supplied to a vaporizing section 23 by a pump 22. Then, it is vaporized in the vaporizing section 23 and ejected in the horizontal direction from the nozzle section 24. The fuel ejected from the nozzle portion 24 is ejected into a mixing pipe 25 provided separately on the downstream side of the vaporizing portion 23 and is mixed therewith while sucking the primary air by the ejector effect, thereby mixing with the mixing pipe 25. It is supplied to the integral line-shaped burner section 26 and burned there. The burner section 26 is present in the combustion flame.
The tip of the frame electrode 27 arranged in the vicinity is positioned,
The combustion sensor 28 includes the frame electrode 27 and the burner section 2
A voltage is applied between 6 and the combustion state is detected from the amount of current flowing.

When the current value falls below a predetermined value, it is judged to be abnormal, and the control unit 29 stops combustion. Then, the generated burned gas is guided upward by the combustion cylinder 30 arranged so as to cover the periphery of the burner portion 26, and is mixed with the room air from the blower 32 by the duct 31 covering the combustion cylinder 30. It is discharged as warm air and used for heating. In this combustion device, when the fuel supply amount is adjusted by changing the driving frequency and the applied voltage of the pump 22, the primary air amount also increases / decreases accordingly, and the combustion amount can be changed while the fuel / air ratio is kept constant. It is like this.

[0004]

However, the combustion device having such a conventional structure has a structure in which, for example, silicon grease used in piping work is mixed with the fuel, or when the silicon is mixed with the fuel for some reason. If a spray of cosmetics containing silicon is used in the vicinity of the device and burned with silicon in the atmosphere, there is a problem that silica adheres to the surface of the frame electrode 27 of the combustion sensor 28 that detects the combustion state. there were.

That is, if the surface of the frame electrode 27 is covered with a silica component that serves as an insulator even at high temperatures, the amount of current flowing even when a voltage is applied between the frame electrode 27 and the burner portion 26 is a fraction of the normal amount. Then, the current value drops even though there is no abnormality, and finally falls below a predetermined value, and it is determined that there is an abnormality, and the control unit 29 stops combustion by a signal from the flame rod type combustion sensor 28 and promptly There was a problem to be cut off. Therefore, if the predetermined value of the current value is set too low, the combustion sensor 28 does not output an abnormal combustion signal even if the combustion state becomes abnormal due to assembly variations or other variations, and the control unit 29 cannot stop combustion. There was also.

In recent years, in particular, a large amount of silicon is used for building materials and cosmetics, and troubles of the combustion sensor 28 due to adhesion of silica to the frame electrode 27 have come to occur frequently.

The present invention is intended to solve the above-mentioned problems. The thermal expansion / contraction of the frame electrode removes the silica adhering to the surface of the frame electrode so that the silica is not affected by the normal detection of the combustion state of the combustion sensor. Is intended to be obtained stably over a long period of time.

[0008]

In order to achieve the above-mentioned object, the present invention achieves the above-mentioned object. The amount of current flowing by applying a voltage between the burner portion, the flame electrode disposed in the combustion flame of the burner portion, and the burner portion. A flame rod type combustion sensor for detecting the combustion state is provided, and the frame electrode of the combustion sensor is made of metal and has a structure in which only the linear portion of the tip end is threaded.

[0009]

As described above, according to the present invention, since the flame electrode of the combustion sensor in the flame is made of metal and has the uneven portion on the surface, even if silica adheres to the surface of the flame electrode, By receiving heat, the thermal expansion and contraction of the screw part can peel off the silica attached to the surface, so that it is not affected by silica and the surface area is increased by the screw part, so that the frame electrode The current value can be easily obtained, the accuracy of the combustion sensor can be improved, and when the silica component adheres, the silica component can be mechanically removed by screwing or threading again, which simplifies the process.

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

First, the construction of a hot air heating apparatus using the combustion apparatus of the present invention will be described with reference to FIG. Reference numeral 1 denotes a main body case, on the lower side of which a tank 2 holding a liquid fuel and a detachable cartridge tank 3 are arranged above the tank 2. Reference numeral 4 denotes a pump mounted on the upper surface of the tank 2, and is adapted to supply fuel from the upper end thereof to the vaporizing section 6 via the oil supply pipe 5. Reference numeral 7 denotes a nozzle portion that horizontally ejects the fuel gas vaporized in the vaporization portion 6. The vaporized fuel ejected from the nozzle portion 7 is sucked in the primary air by the ejector effect and is discharged to the downstream side of the vaporization portion 6. It is jetted out into a mixing tube 8 provided separately, mixed there, supplied to a line-shaped burner portion 9 integrated with the mixing tube 8, and burned there.

Reference numeral 10 denotes a flame rod type combustion sensor which is arranged in the vicinity of the burner section 9 and which applies a voltage between the flame electrode 11 placed in the combustion flame and the burner section 9 to detect the combustion state from the amount of flowing current. The screw electrode 12 is provided only on the linear portion of the tip of the frame electrode on the burner side.

A reference numeral 13 designates an ignition electrode 14 and a burner portion 9 which are also disposed adjacent to the frame electrode 11 in the vicinity of the burner portion 9.
Is a high-pressure discharge type ignition means for starting the combustion of the burner portion 9 by the discharge between the above and the other.

Reference numeral 15 is a combustion cylinder for guiding the high temperature combustion gas from the burner portion 9 upward, and a blower 16 for taking in and discharging indoor air is arranged at the back portion thereof. 17 is the combustion cylinder 15
This is a duct that mixes the high temperature combustion gas from the room with the indoor air to generate warm air. Reference numeral 18 denotes a control unit that controls the pump 4 and the vaporization unit 6 to burn the burner unit 9, and the pump 4 and the vaporization unit 6 are arranged in a predetermined sequence based on an operation condition signal input from the operation unit 19. It is designed to be controlled.

In the above structure, the cartridge tank 3
The liquid fuel supplied to the tank 2 so as to maintain a constant oil level from the tank 2 is sucked up from the tank 2 by the pump 4 and sent to the vaporizing section 6 via the oil supply pipe 5. The sent fuel is vaporized in the vaporization section 6 kept at a predetermined temperature or higher by a heater (not shown), becomes high-pressure fuel gas, and is ejected from the nozzle section 7. At that time, primary air is sucked by the ejector effect. Meanwhile, they are mixed in a mixing pipe 8 provided on the downstream side of the vaporization section 6 and supplied into the burner section 9 and are ejected from the flame holes of the burner section 9. If a high voltage is applied intermittently between the ignition electrode 14 and the burner section 9, a discharge is generated between the ignition electrode 14 and the burner section 9 to form a flame in the flame hole of the burner section 9 for combustion. Even if the discharge is started and the discharge is stopped, if the pump 4 continues to supply the fuel to the vaporization section 6, the combustion will continue. Then, the generated high-temperature combustion gas flows above the combustion cylinder 15, is mixed with the indoor air flow from the blower 16 in the duct 17, is discharged as warm air, and is used for heating. Then, the control unit 18 controls the pump 4, the vaporization unit 6 and the like in a predetermined sequence based on the condition set by the operation unit 19 to perform operation control such as increase / decrease of the combustion amount, and the burner unit. When the current value obtained from the amount of current flowing by applying a voltage between the flame electrode 11 and the burner portion 9 placed in the combustion flame in the vicinity of 9 falls below a predetermined value, the combustion sensor 10 is judged to be abnormal and is output. Signals give a warning, etc. to stop driving.

Here, the frame electrode 11 of the combustion sensor 10 for detecting the combustion state from the amount of current flowing by applying a voltage between the burner portion 9 and the burner portion 9 has a surface area increased by the screw portion 12. The flame electrode 11 can easily take the ion current in the combustion flame, and the accuracy of the combustion sensor 10 can be improved.

Further, the flame electrode 11 of the combustion sensor 10
Since the threaded portion 12 is provided on the surface, even if silica adheres to the surface of the frame electrode 29, the heat of the burner portion 9 receives the thermal expansion / contraction of the threaded portion 12, so that even at high temperature. The silica that serves as an insulator can be peeled off, and the influence of silica can be prevented.

The frame electrode 11 has a complicated bent shape in order to easily take an ionic current in the combustion flame. However, the threaded portion 12 is formed only by the linear portion of the tip end on the burner portion 9 side. Compared with the screw-processed portion 12 provided in the above, the deformation that is likely to occur in the bent portion without being influenced by the screw-processed portion 12 can be reduced, and since only a part is processed, the man-hour can be reduced and the cost can be reduced.

Further, in the threaded portion at the tip of the frame electrode 11, the silica component can be mechanically easily removed by performing additional screw tightening or thread cutting when the silica component is attached, which facilitates maintenance. There is.

In the above embodiment, the flame electrode 11 of the combustion sensor 10 has a structure in which the threaded portion 12 is provided on the surface only in the straight portion of the tip portion on the burner portion 9 side. May be applied to
The configuration of each of the other parts may be any configuration as long as the object of the present invention is achieved.

[0021]

As described above, in the combustion apparatus of the present invention, the flame electrode of the combustion sensor receives the heat of the combustion portion even if silica adheres to the surface of the flame electrode whose surface is screwed. Silica that adheres to the surface can be peeled off by thermal expansion and contraction of the screw part, and it can be prevented from being affected by silica, and the current value can be easily obtained with the frame electrode due to the increased surface area due to the screw part. The accuracy of the combustion sensor can be improved, and when the silica component adheres, the screw component can be mechanically removed again by screwing or threading again, and the combustion state of the combustion sensor can be detected. It will be possible to obtain it stably over a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view of a warm air heater according to an embodiment of the present invention.

FIG. 2 is a detailed view of the main part of the combustion device.

FIG. 3 is a cross-sectional view of a warm air heater using a conventional combustion device.

[Explanation of symbols]

 9 Burner part 10 Combustion sensor 11 Frame electrode 12 Screw part of frame electrode

Claims (2)

[Claims] 1. A burner section, a flame electrode arranged in a combustion flame of the burner section, and a flame rod type combustion sensor for detecting a combustion state from an amount of current flowing by applying a voltage between the burner sections. A combustion device comprising a flame electrode of the combustion sensor portion, the surface of which is subjected to metal screw processing. 2. The combustion device according to claim 1, wherein the flame electrode of the combustion sensor is formed by threading only the linear portion of the tip portion on the combustion flame side.