JPH0814548A - Combustion device - Google Patents

Abstract

PURPOSE:To contrive the sure detection of the adhesion of tar or the like as well as the maintaining of excellent combustion. CONSTITUTION:A combustion device is constituted so that the temperature of an evaporator is detected by an evaporator temperature detecting unit 20a and an amount of combustion control unit 22 increase the supplying amount of fuel so that the temperature of a evaporator 12, detected by an evaporator temperature detecting unit 20a, will never become lower than a predetermined temperature. Accordingly, when the reduction of the evaporator temperature, which will never be generated by the local disturbance of combustion or the like, is generated due to the adhesion of tar or the like, the reduction is detected by the evaporator temperature detecting unit 20a and, therefore, the adhesion of tar and the like can be detected surely. On the other hand, the amount of combustion is controlled so as not to be reduced to a value lower than a predetermined value whereby excellent combustion can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device that vaporizes and ejects fuel for combustion.

[0002]

2. Description of the Related Art Conventionally, in this type of combustion apparatus, as shown in FIG. 6, fuel is supplied from a cartridge tank 26 to a tank 25, and the fuel in the tank 25 is supplied to a carburetor 28 by an electromagnetic pump 27. Then, it is vaporized and ejected from the nozzle 29. Then, the fuel ejected from the nozzle 29 is supplied to the burner portion 31 while sucking the primary air by the ejector effect, and is burned there. The generated combustion gas is guided upward by the combustion cylinder 32 arranged so as to cover the periphery of the burner portion 31, and the combustion cylinder 3
It is mixed with the indoor air flow from the blower 34 in the duct 33 that covers the 2 and is discharged as warm air to be used for heating. When the fuel supply amount is adjusted by changing the driving frequency or the applied voltage of the electromagnetic pump 27 in this combustion device, the primary air amount also increases / decreases accordingly, and the combustion amount is changed while the fuel / air ratio is kept constant. Is able to.

[0003]

However, in the combustion apparatus having such a configuration, the performance of the electromagnetic pump 27 is deteriorated over time, and the discharge flow rate thereof is extremely decreased, or the fuel is denatured or mixed with different oils. When the tar is attached to the nozzle 29 of the vaporizer 28 and the ejection pressure loss becomes extremely large, the amount of vaporized gas ejected from the nozzle 29, that is, the amount of combustion, is extremely reduced, and There was a problem that the flow velocity slowed down and flashback occurred, the balance between fuel and air was lost, the combustion flame was disturbed, the combustion flame fell too much and carbon monoxide, unburned gas and odor were generated. .

Conventionally, in order to solve this problem, a combustion sensor such as a flame rod system which is arranged in the vicinity of the burner portion 31 and which detects the combustion state by passing an electric current between the electrodes placed in the combustion flame and measuring the amount thereof. Is provided to detect the above-mentioned abnormality in the combustion state and issue a warning or stop the combustion. However, in this case, there is a problem that malfunction occurs due to local disturbance of combustion or the like, and malfunction occurs due to confusion with other abnormal combustion such as oxygen deficiency.

The present invention has been made to solve the above problems, and an object of the present invention is to reliably detect a secular decrease in the amount of combustion and maintain good combustion.

[0006]

In order to achieve the above object, the present invention, in the first configuration, vaporizes the fuel supplied by the electromagnetic pump and ejects it from the nozzle, and the vaporized gas is burned. A burner section for heating the vaporizer with its combustion heat, a vaporizer temperature detection section for detecting the temperature of the vaporizer, and a heater for keeping the vaporizer temperature detected by the vaporizer temperature detection section at a predetermined temperature or higher. And a heater control unit that controls energization to the heater, and a combustion amount control unit that varies the fuel supply amount from the electromagnetic pump,
The combustion amount control unit is configured to increase the fuel supply amount from the electromagnetic pump so that the temperature of the carburetor detected by the carburetor temperature detection unit does not become lower than the temperature set higher than the predetermined temperature.

In the second configuration, the vaporizer for vaporizing the fuel supplied by the electromagnetic pump and ejecting the vapor from the nozzle, the burner for burning the vaporized gas, and the vaporizer temperature for detecting the temperature of the vaporizer. A detection unit, a heater that keeps the temperature of the carburetor detected by the carburetor temperature detection unit at a predetermined temperature or higher, a heater control unit that controls energization to the heater, and a variable fuel supply amount from the electromagnetic pump. A combustion amount control unit, a heat receiving unit heated by the burner unit, and a heat receiving unit temperature detection unit that detects the temperature of the heat receiving unit, and the combustion amount control unit receives the heat received by the heat receiving unit temperature detection unit. The fuel supply amount from the electromagnetic pump is controlled to increase so that the temperature of the part does not become lower than a predetermined temperature.

Further, in the third structure, a vaporizer for vaporizing the fuel supplied by the electromagnetic pump and ejecting it from the nozzle, and a burner portion for burning the vaporized gas and heating the vaporizer with its combustion heat are provided. A vaporizer temperature detection unit that detects the temperature of the vaporizer, a heater that keeps the temperature of the vaporizer detected by the vaporizer temperature detection unit at a predetermined temperature or higher, and a heater control unit that controls energization of the heater. A combustion amount control unit for varying the fuel supply amount from the electromagnetic pump, and the heater control unit outputs a signal for increasing the combustion amount to the combustion amount control unit when the energization amount to the heater exceeds a predetermined value. In addition, the combustion amount control unit increases the fuel supply amount from the electromagnetic pump based on the combustion amount increase signal and controls so that the heater is not energized.

[0009]

According to the first aspect of the present invention, when the capacity of the electromagnetic pump is deteriorated with time and the fuel supply amount from the electromagnetic pump is extremely decreased, or when the fuel is denatured or mixed with different kinds of oil, it is burned. When tar adheres to the nozzle of the vaporizer and the ejection pressure loss becomes extremely large, the ejection amount of vaporized gas from the nozzle decreases and the combustion amount decreases. As a result, the heating of the carburetor is reduced due to the combustion flame that does not occur due to local disturbance of combustion, etc., and the carburetor temperature is lowered. It is possible to reliably detect the decrease.

Further, according to the second structure, as in the above case, the combustion amount is reduced, the heating amount from the burner portion to the heat receiving portion is reduced, and the heat receiving portion temperature is lowered. Therefore, the heat receiving portion temperature detecting portion detects this. As a result, it is possible to reliably detect a decrease in the combustion amount due to secular change or tar adhesion.

Further, according to the third structure, when the combustion amount decreases as described above, the heating amount from the burner portion decreases and the carburetor temperature lowers. The heater control section detects the energization, and thus the decrease in the combustion amount due to secular change or tar adhesion can be reliably detected.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the overall configuration of a warm air heater using the combustion device of the present invention will be described with reference to FIG. 5. Reference numeral 1 is a main body case, 2 is a tank for holding liquid fuel, which is arranged on the lower side of the main body case 1. 2, a removable cartridge tank 3 is arranged above it. Reference numeral 4 denotes an electromagnetic pump arranged on the upper surface of the tank 2 for supplying fuel to the combustion section 6 via an oil feed pipe 5. Reference numeral 7 is a combustion cylinder that guides the combustion gas from the combustion section 6 upward, and a blower 8 that takes in the indoor air flow and sends it out as warm air is disposed on the back of the combustion cylinder. 9
Is a duct that covers the combustion cylinder 7 and mixes the combustion gas and the indoor air flow to generate warm air. Reference numeral 10 denotes a control unit provided on the upper portion of the main body case 1, which controls combustion in the combustion unit 6.

The structures of the combustion section 6 and the control section 7 will be described below with reference to FIG. First, the structure of the combustion unit 6 will be described. Reference numeral 11 is a disk-shaped vaporization block body, which is integrally formed with a vaporizer 12 for vaporizing the fuel from the electromagnetic pump 4 toward the center thereof. A heater 13 is provided along the outer peripheral portion of the vaporization block body 12 and the vaporization block body 11. Reference numeral 14 is a nozzle for ejecting vaporized gas from the vaporizer 12, which is adapted to eject vaporized gas into a burner portion described later through an opening formed by hollowing out the central portion of the vaporization block body 11. Reference numeral 15 denotes a burner seat formed on the outer peripheral portion of the vaporization block body 11. The throat 16 mixes the vaporized gas from the nozzle 14 with the primary air, and a large number of the gas mixture from the throat 16 is provided on the peripheral wall thereof. The burner part 18 for ejecting from the flame hole 17 and burning is installed.
It has a heat receiving portion 19 that is heated by the combustion flame in the above and recovers the combustion heat.

The structure of the control unit 10 will be described below.
Is a thermistor embedded in the vaporizer 12 and sends an output to the vaporizer temperature detector 20a. Reference numeral 21 denotes a heater control unit that controls the energization of the heater 13 based on the output from the carburetor temperature detection unit 20a, and controls the heater 13 so that the temperature of the carburetor 12 does not fall below a predetermined first predetermined temperature. The energization is controlled. A combustion amount control unit 22 controls the drive of the electromagnetic pump 4 based on the output from the carburetor temperature detection unit 20a. The combustion amount control unit 22 controls the fuel amount supplied from the electromagnetic pump 4 according to the room temperature condition, and A direction in which the amount of fuel supplied from the electromagnetic pump 4 is increased so that when the carburetor temperature detected by the detection unit 20a reaches a second predetermined temperature which is set higher than the first predetermined temperature, it does not fall below the second predetermined temperature. The electromagnetic pump 4 is controlled. At the same time, the combustion amount control unit 22 sends an output to a warning unit 23 such as an LED or a buzzer to give a warning while controlling to increase the fuel supply amount.

In the above structure, the operation will be described below. Liquid fuel is supplied from the cartridge tank 3 to the tank 2 so as to maintain a constant oil level, and the electromagnetic pump 4 is then supplied.
Is sucked up from the tank 2 and sent to the vaporizer through the oil feeding pipe 5. The sent fuel is vaporized in the carburetor 12 kept at a predetermined temperature or higher by the heater 13, becomes high-pressure vapor, and is ejected from the nozzle 14, while being mixed in the throat 16 while sucking the primary air by the ejector effect. Then, it is supplied to the burner section 18 and burned. Then, the generated combustion gas flows above the combustion cylinder 7, is mixed with the indoor air flow from the blower 8 in the duct 9, and is sent as warm air to be used for heating.

On the other hand, the temperature of the carburetor 12 is detected by the carburetor temperature detecting section 20a, and the heater control section 21 determines the temperature of the carburetor 12 based on the output from the carburetor temperature detecting section 20a. The energization of the heater 13 is controlled so that the following does not occur.

Here, the vaporizer 12 has a heat receiving portion 1 thereof.
9 is heated by the combustion flame formed in the burner portion 18, and is kept at a temperature higher than at least the second predetermined temperature, preferably at a temperature higher than the first predetermined temperature by the action of heat recovery from the combustion flame. When burning above the lower limit of the width, the heater 13 is not energized to save power.

That is, the vaporizer 12 has a burner section 18
The heat from the combustion flame is absorbed by the heat receiving portion 19 and a part or the whole of the energization of the heater 13 is reduced. However, the heat receiving amount is exposed to a high temperature by increasing the height of the heat receiving portion 19. The larger the heat-receiving area, the larger the amount of combustion. This amount of heat received, and the amount of heat of vaporization such as latent heat of vaporization used when the fuel vaporizes,
The energization amount of the heater 13 changes depending on the balance of heat such as the cooling / heat radiation amount of the carburetor itself kept at high temperature, and according to the experiment of this configuration, when the combustion amount exceeds the predetermined level as shown in FIG. The amount of heat is superior, and it is not necessary to energize the heater 13.

Therefore, the amount of heat received is structurally adjusted so that the lower limit of the combustion variable width becomes the above-mentioned predetermined level of combustion amount, which normally eliminates the need to energize the heater 13 and the vaporizer 12 Is maintained at least at a second predetermined temperature or higher.

However, after being used for a long period of time, the capacity of the electromagnetic pump 4 is lowered and the discharge flow rate of the electromagnetic pump 4 is reduced, or the fuel mixed with the modified oil or the different oil is burned to the carburetor 12 and the nozzle 14. If tar adheres and the ejection pressure loss becomes extremely large, the amount of vaporized gas ejected from the nozzle 14 decreases, and the combustion amount decreases below the lower limit combustion amount of the combustion variable width. As a result, the amount of heat recovered from the heat receiving portion of the carburetor 12 starts to decrease and the temperature starts to decrease, and when the temperature drops to the second predetermined temperature higher than the first predetermined temperature at which the heater energization is started, the carburetor temperature detection unit 20a. Detects this, and sends the output that has become equal to or lower than the second predetermined temperature to the combustion amount control unit 22. The temperature decrease of the carburetor 12 does not occur when a part of the combustion flame deteriorates, but only when the combustion amount decreases. Therefore, as compared with the case where the flame condition is monitored by the frame rod, the tar adhesion and the like can be detected more reliably.

On the other hand, when the temperature of the carburetor 12 is detected by the carburetor temperature detection unit 20a to be equal to or lower than the second predetermined temperature, the combustion amount control unit 22 outputs the output from the carburetor temperature detection unit 20a. Based on the above, a fuel supply increase signal is output to the electromagnetic pump 4, the fuel supply amount by the electromagnetic pump 4, that is, the combustion amount is increased to recover the flame heat recovery amount to the carburetor 12, and the carburetor temperature is set to the second value. The electromagnetic pump 4 is drive-controlled so as not to drop below a predetermined temperature. At the same time, the combustion amount control section 22 sends an output to the warning means 23 to operate it and informs the user that it is used in an abnormal state such as LED lighting or buzzer sound. This allows the user to be aware of abnormal use and deal with it.

Therefore, the amount of vaporized gas ejected from the nozzle 14 over time, that is, the amount of combustion, decreases and the flow velocity slows to cause flashback, the balance of fuel and air is lost, and the combustion flame. It is possible to prevent the generation of carbon monoxide, unburned gas, and odor due to the disturbance of the fuel and the combustion flame dropping too much, and the user removes the tar attached to the vaporizer 12 and the nozzle 14 by a warning. It is possible to maintain good combustion and extend the life of the combustion device.

FIG. 2 shows another embodiment of the invention. The same parts as those described in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. Explaining only the different parts, in the present invention, the flame of the burner part 18 will be described. The heat receiving portion 24 heated by the heat receiving portion 24 is separately provided, and the output from the heat receiving portion temperature detecting portion 20b for detecting the temperature of the heat receiving portion 24 is sent to the combustion amount control portion 22.

Therefore, according to this structure, when the amount of combustion decreases due to the adhesion of tar, etc., the heat receiving portion 2
4 When the temperature decreases and the temperature becomes equal to or lower than the second predetermined temperature, the heat receiving unit temperature detection unit 20b detects this and sends the output to the combustion amount control unit 22, and the combustion amount control unit 22 based on the output. The electromagnetic pump 4 is drive-controlled and the warning means 23 is driven so that the combustion amount does not further decrease. That is, the same effect as that of the previous embodiment can be obtained.

FIG. 3 shows another example of the invention. When the carburetor temperature detecting section 20a shown in the first example of the invention detects the second predetermined temperature and sends a heater energization command to the heater control section 21. The heater control unit 21 sends a signal to the combustion amount control unit 22, and the combustion amount control unit 22 drives and controls the electromagnetic pump 4 so as to prevent the combustion amount from further decreasing, and also drives the warning unit 23. The same effect as that of the embodiment can be obtained.

That is, although it is normally unnecessary to energize the heater 13, when the amount of vaporized gas ejected from the nozzle 14 over time, that is, the combustion amount decreases, energization of the heater 13 is instructed. When there is a signal, the combustion amount control unit 22 determines that the combustion amount has decreased due to tar adhesion, etc., and the combustion amount control unit 22 activates the warning means 23 such as blinking of the LED lamp, and then the temperature of the carburetor 12 is increased. Feedback control is performed so that the fuel discharge amount of the electromagnetic pump 4 is increased so that does not become lower than the specified value.

In the above embodiment, the combustion amount control section 22 determines that the combustion amount is reduced by energizing the heater 13. However, this is because the combustion amount is reduced when the energization of the heater 13 exceeds a predetermined energizing amount. It may be determined that the temperature of the carburetor 12 has decreased after the combustion amount control unit 22 operates the warning means 23 such as blinking of the LED lamp. Although the electromagnetic pump 4 is feedback-controlled so as not to fall below the specified value, this may be performed by either the operation of the warning means 23 or the feedback control of the electromagnetic pump 4 alone. The invention is not limited to the configuration of the embodiment as long as it achieves the objects and effects of the invention, and may have any configuration.

[0028]

As described above, according to the combustion apparatus of the present invention, the deterioration of the performance of the electromagnetic pump and the tar deterioration can be surely achieved without being affected by the local disturbance of combustion in any structure. It is possible to detect a decrease in the combustion amount due to adhesion and control so that the decrease in the combustion amount does not fall below a predetermined level, so good combustion can be achieved without generating carbon monoxide, unburned gas and odor. It can be maintained and the life of the combustion device can be extended.

Further, in the case where the warning means is driven when the combustion amount is controlled so as not to fall below a predetermined amount, the user notices the tar adhesion and the like and takes appropriate measures against it. The life of the combustion device can be further extended.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a combustion device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing another example of the invention of the combustion apparatus.

FIG. 3 is a configuration diagram showing another example of the invention of the combustion apparatus.

FIG. 4 is a characteristic diagram showing a relationship between a combustion amount and a heat receiving amount of the combustion device.

FIG. 5 is a cross-sectional view of a main part of a warm air heater using the same combustion device.

FIG. 6 is a sectional view of a conventional combustion device.

[Explanation of symbols]

 4 Electromagnetic Pump 12 Vaporizer 14 Nozzle 13 Heater 18 Burner Section 20a Vaporizer Temperature Detection Section 20b Heat Receiving Section Temperature Detection Section 21 Heater Control Section 22 Combustion Amount Control Section 23 Warning Means 24 Heat Receiving Section

Claims (4)

[Claims] 1. A vaporizer for vaporizing a fuel supplied by an electromagnetic pump and ejecting it from a nozzle, a burner section for burning the vaporized gas and heating the vaporizer with its combustion heat, and a temperature of the vaporizer. From the electromagnetic pump, a heater that keeps the temperature of the vaporizer detected by the vaporizer temperature detection unit at a predetermined temperature or higher, a heater control unit that controls energization to the heater, And a combustion amount control unit for varying the fuel supply amount, wherein the combustion amount control unit controls the carburetor temperature from the electromagnetic pump so that the temperature of the carburetor detected by the carburetor temperature detection unit does not become lower than a temperature set higher than the predetermined temperature. A combustion device configured to control so as to increase the fuel supply amount. 2. A vaporizer for vaporizing the fuel supplied by an electromagnetic pump and ejecting it from a nozzle, a burner portion for burning the vaporized gas, and a vaporizer temperature detecting portion for detecting the temperature of the vaporizer, A heater that keeps the temperature of the carburetor detected by the carburetor temperature detection unit at a predetermined temperature or higher, a heater control unit that controls energization to the heater, and a combustion amount control unit that changes the fuel supply amount from the electromagnetic pump. And a heat receiving portion heated by the burner portion, and a heat receiving portion temperature detecting portion for detecting the temperature of the heat receiving portion, wherein the combustion amount control portion has the temperature of the heat receiving portion detected by the heat receiving portion temperature detecting portion in advance. A combustion device configured to control so as to increase the amount of fuel supplied from an electromagnetic pump so as not to fall below a predetermined temperature. 3. A vaporizer for vaporizing fuel supplied by an electromagnetic pump and ejecting it from a nozzle, a burner section for burning the vaporized gas and heating the vaporizer with its combustion heat, and a temperature of the vaporizer. From the electromagnetic pump, a heater that keeps the temperature of the vaporizer detected by the vaporizer temperature detection unit at a predetermined temperature or higher, a heater control unit that controls energization to the heater, And a combustion amount control unit for varying the fuel supply amount, wherein the heater control unit is configured to output a signal for increasing the combustion amount to the combustion amount control unit when the energization amount to the heater exceeds a predetermined value, Further, the combustion device is configured such that the combustion amount control unit increases the fuel supply amount from the electromagnetic pump based on the combustion amount increase signal so as not to energize the heater. 4. The combustion amount control unit increases the fuel supply amount from the electromagnetic pump so that the temperature of the carburetor does not become lower than a specified value set higher than the predetermined temperature, or the combustion amount from the heater control unit. The combustion device according to claim 1 or 3, wherein the warning means is driven when performing control to increase the fuel supply amount from the electromagnetic pump based on the increase signal.