JP2003202102A - Combustion equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption of a carburetor during a preheating standby period. <P>SOLUTION: This combustion device comprises the carburetor 13, a conveyance path 17 communicating with the downstream side of the carburetor 13, a flame hole 18 which is arranged on the downstream side of the conveyance path and forms a flame 40, a temperature detecting part 39 which is provided on one section of the conveyance path 17, and a control part 38 which receives a signal from the temperature detecting part 39 and changes the control temperature of the carburetor 13 during the preheating standby period. Even if temperature variations of the conveyance path 17 occur because of fluctuations of the outside air temperature and temperature difference among regions, the control part 38 receiving the signal from the temperature detecting part 39 changes the preheating standby temperature of the carburetor 13 and keeps the temperature of the inside of the conveyance path 17 so as to prevent vaporized gas 42 from condensation, thus combustion failure caused by the generation of white smoke and accumulation of fuels can be prevented and reduction in the power consumption can be accurately performed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization type combustion apparatus which is mounted on a domestic hot water supply device or a heating device and which reduces power consumption during standby for preheating of a vaporizer.

[0002]

2. Description of the Related Art As a conventional combustion apparatus of this type, for example, one shown in FIG. 7 is known. In the figure, 1 is a vaporizer for vaporizing liquid fuel, 2 is a vaporization chamber provided inside the vaporizer 1, 3 is an electric heater for heating the vaporizer 1, 4 is temperature detection for detecting the temperature of the vaporizer 1. 5 is a mixing chamber communicating with the downstream side of the vaporizer 1, 6 is a burner head forming a flame on the downstream side of the mixing chamber 5, 7 is a nozzle for spraying liquid fuel into the vaporization chamber 2, 8 is the vaporization chamber 2 An air blower for supplying air to the burner head 6 and a timer 9 for measuring a predetermined time after the combustion is stopped and changing the control temperature of the temperature detector 4 after the predetermined time has elapsed.

[0003]

However, in the above-mentioned conventional structure, the control temperature of the temperature detector 4 of the carburetor 1 is controlled by the timer means 9 after the combustion is stopped,
While preheating the vaporizer 1, the control temperature is lowered and the mixing chamber 5
The temperature of the burner head 6 and the temperature of the burner head 6 are changed to a temperature higher than the vaporization limit temperature of the liquid fuel, and the power consumption is reduced while promptly reburning.

However, in order to further reduce the power consumption, it is necessary to bring the control temperature of the carburetor 1 closer to the vaporization limit temperature, which is controlled only by the temperature detection of the carburetor 1 and the temperature control. There is a problem that accurate temperature control cannot be performed in order to prevent condensation of vaporized gas in the chamber 5.

The present invention solves the above-mentioned conventional problems, and copes with the case where the temperature of the mixing chamber is different due to the change of the outside air temperature due to the change of the climate or the temperature difference between the regions of cold regions and high temperature regions. Then, an object of the present invention is to provide a combustion device that can reduce the power consumption optimally according to the state at each time without causing white smoke generation due to condensation of vaporized gas or combustion failure due to fuel accumulation.

[0006]

In order to achieve the above-mentioned object, the combustion apparatus of the present invention detects the temperature of a mixing chamber provided downstream of a vaporizer, and a temperature at which vaporized gas does not cause dew condensation in the mixing chamber. In addition, the preheating standby temperature of the vaporizer is controlled so that the mixing chamber is always maintained.

As a result, even if there is a difference in the temperature of the transfer passage due to a change in the outside air temperature due to a change in the climate or a temperature difference between regions of cold regions and high temperature regions, the control unit that receives the signal from the temperature detection unit By changing the preheat standby temperature of the carburetor and changing the amount of heat transferred from the carburetor to the transfer passage, the temperature inside the transfer passage is maintained at a temperature at which vaporized gas does not condense, and combustion failure due to white smoke generation and fuel accumulation is prevented and consumed. The power can be reduced accurately.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a vaporizer for vaporizing a liquid fuel, a transfer passage communicating with a downstream side of the vaporizer, and a flame installed on the downstream side of the transfer passage to form a flame. A flame outlet, a temperature detection unit provided in a part of the transport passage, and a control unit that receives a signal from the temperature detection unit and changes the control temperature during standby for preheating of the carburetor, thereby changing the climate. Even if there is a difference in the temperature of the transfer passage due to the fluctuation of the outside air temperature due to the temperature difference and the temperature difference between cold regions and high temperature regions, the control unit that receives the signal of the temperature detection unit changes the preheat standby temperature of the carburetor. , The amount of heat transferred from the carburetor to the transfer passage is changed to maintain the temperature at which vaporized gas does not condense in the transfer passage at the start of operation, preventing white smoke during operation stop and combustion failure due to fuel pool during operation. Along with the accurate reduction of power consumption Can.

The invention as defined in claim 2 is particularly characterized by claim 1.
When the control unit described in 1 performs the operation when the temperature detection unit shows a value below a predetermined temperature, the specified small amount of combustion is operated until the temperature detection unit shows a value above the predetermined temperature. By doing so, even if the temperature of the transport passage is below a predetermined temperature,
A small amount of flame with a small amount of dew condensation is formed in the transfer passage at the flame mouth, and the heat of combustion heats the carburetor, which heat is transferred to the transfer passage and heats the transfer passage. Even if the vaporized gas of (3) flows into the transfer passage, no dew condensation occurs, so that it is possible to prevent the occurrence of white smoke when the operation is stopped and the combustion failure due to the fuel pool during the operation.

The invention as defined in claim 3 is particularly defined by claim 1.
When the control unit described in (1) performs operation when the temperature detection unit shows a value below a predetermined temperature, the voltage of the heating means of the carburetor is increased until the temperature detection unit shows a value above the predetermined temperature. By doing so, the electric energy of the vaporizer is increased to rapidly raise the temperature, the heat combined with the heating of the vaporizer due to the combustion heat is transferred to the transport passage, and the transport passage is heated in a short time, and then the rated combustion amount is reached. Even if a large amount of vaporized gas flows into the transfer passage, dew condensation does not occur, so that it is possible to prevent the occurrence of white smoke at the time of operation stop and the combustion failure due to the fuel pool during operation.

The invention as defined in claim 4 is particularly characterized by claim 1.
The control unit described in (1) corrects the temperature of the temperature detection unit according to the value of the supply air temperature detection unit, and changes the control temperature during standby for preheating of the carburetor, so that the temperature of the transfer passage at the start of operation becomes vaporized gas. Even if the temperature is not dew condensation, it is predicted that a large amount of low-temperature air will flow in and the transport passage will be cooled.
Since the temperature of the vaporizer during preheat standby is raised and the temperature of the transfer passage is increased, even if a large amount of vaporized gas with a rated combustion amount subsequently flows into the transfer passage, no condensation occurs and white smoke is generated when the operation is stopped. It is possible to prevent combustion failure due to fuel accumulation during operation.

The invention as defined in claim 5 is particularly characterized by claim 1.
By providing a plurality of temperature detection parts in the transfer passage, the temperature distribution of the portion of the transfer passage that is likely to receive heat from the carburetor and the portion that is susceptible to combustion heat will be grasped. The accuracy can be improved.

The invention according to claim 6 is particularly characterized by claim 1.
The control unit described in 1 predicts the temperature of the transfer passage by the value of the supply air temperature detection unit and gives an instruction, thereby predicting the temperature of the transfer passage using the existing supply air temperature detection unit, and the carburetor. Since the temperature during preheat standby is changed to control the temperature in the transfer passage to a temperature that does not cause dew condensation, white smoke will be generated when operation is stopped and fuel will accumulate during operation without the need for a new temperature detection configuration. Combustion failure due to can be prevented.

The invention as defined in claim 7 is particularly defined by claim 1.
The control unit described in 1 predicts the temperature of the transfer passage by the value of the outside air temperature detection unit and gives an instruction, thereby predicting the temperature of the transfer passage from the outside air temperature (weather and climate) at the start of operation,
In addition, it is predicted that a large amount of low-temperature supply air will flow into the transfer passage, and the predicted values will be combined and evaluated. As the temperature rises, it is easy to control the temperature according to the climate, and it is possible to prevent combustion failure due to white smoke generation during operation stop and fuel accumulation during operation.

The invention as defined in claim 8 is particularly defined by claim 1.
The control unit described in (1) assumes that the temperature of the transfer passage is assumed by the value of the timer means and gives an instruction, thereby determining the climate from the lapse of time of the timer at the start of operation, predicting the temperature of the transfer passage, and the carburetor. Since the temperature in the preheating standby state is changed and the temperature in the transfer passage is changed, it can be configured by simple parts in the control unit, and it is possible to prevent the generation of white smoke when the operation is stopped and the combustion failure due to the fuel pool during the operation.

[0016]

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

(First Embodiment) FIG. 1 shows a combustion apparatus according to a first embodiment of the present invention. In the figure, 10 is a fuel pump for pumping kerosene, which is liquid fuel, from a fuel tank (not shown) to a combustion device, 11 is a fuel supply nozzle for supplying liquid fuel from the fuel pump 10 through an oil feed pipe 12, and 13 is a fuel supply nozzle. The vaporizer provided in front of the fuel supply nozzle 11 includes aluminum, aluminum alloy such as duralumin, brass, copper,
It is made of a heat-resistant material with good heat conductivity such as steel or cast iron, and is formed into a tubular shape. A carburetor lid 15 is provided on the side surface of the carburetor 13 so that the end portion of the blower pipe 14 faces the carburetor lid 15. The carburetor lid 15 includes aluminum, brass, copper,
It is made of a material with good heat conductivity such as cast iron. The fuel supply nozzle 11 is inserted into the blower pipe 14 toward the carburetor 13. At the bottom of the carburetor 13, a gas mixture outlet 16 configured with a carburetor lid 15 is provided.

Reference numeral 17 is provided below the mixture jet port 16,
A transport passage formed in a bowl shape from a heat-resistant material having low heat conductivity (compared to aluminum, aluminum die cast, and copper) such as iron, stainless steel, ceramic, and glass, and communicates with the downstream side of the vaporizer 13. A porous flame port 18 made of a heat-resistant material such as steel, iron, titanium, duralumin, or ceramic is installed on the downstream side of the transfer passage 17.

Reference numeral 19 denotes a burner case which covers the entire combustion section.
The space inside the carburetor 13, the transfer passage 17, the flame port 1
The air passage 20 is provided so as to surround the periphery of the air bag 8. Reference numeral 21 is a cylindrical 2 provided adjacent to the flame port 18.
A plurality of secondary air outlets 22 facing the downstream side of the flame port 18 are provided in the secondary air passage. The flame port 18 and the secondary air passage 21 are configured to be flush with each other toward the downstream side. The end of the secondary air passage 21 has an air passage 20
Be communicated to. Reference numeral 23 is a side wall provided between the flame port 18 and the air passage 20, and a combustion chamber 24 is formed inside thereof. Reference numeral 25 is a fin-shaped heat receiving portion formed on the back surface of the vaporizer 13 so as to project to the combustion chamber 24. Heat receiving part 25
Is arranged at a position overhanging above the flame port 18.

Reference numeral 26 is a heat exchanger mounted on the top plate portion 27 of the air passage 20 so as to cover the upper side of the flame port 18. The heat exchanger 26 is formed into a tubular shape using a heat-resistant copper or aluminum material having good thermal conductivity, and a plurality of plate-shaped fins are provided on a plurality of hot water pipes on the way.

Reference numeral 28 denotes a blower for supplying combustion air. A turbo fan, a radial fan or the like capable of producing a high pressure is used for the impeller, and is configured to be rotated by a motor. A part of a side portion of the air passage 20 is provided. Is connected to the ventilation passage 29 communicated with. The blower pipe 14 is provided inside the blower passage 29. The blower pipe 14 is provided with a plurality of communication ports 30 communicating with the blower passage 29 at a position before being inserted into the vaporizer lid 15.

Reference numeral 31 denotes a vaporization air conditioner provided in the air passage 29, which includes a closing damper 32 for changing the blowing resistance of the blower pipe 14 by opening and closing, an upper damper 33, and the closing damper 32 and the upper damper 33. And a drive device 34 for rotationally driving. The closing damper 32 and the upper damper 33 are provided so as to rotate coaxially about the plate surfaces of the two plates, and may be opened / closed in the vertical direction or opened in the horizontal direction. The closing damper 32 is provided on the side in contact with the inlet of the blower pipe 14, and has a plurality of through holes 35 in a part thereof. The upper damper 33 is provided at a position overlapping the outer side of the closing damper 32, and substantially contacts the closing damper 32 in the mode of the region including the minimum combustion amount, substantially closes the through hole 35, and the combustion amount is in the intermediate region. Closed damper 32 in mode
And an angle is provided between and to open the through hole 35. In the mode including the region where the combustion amount is maximum, both the closing damper 32 and the upper damper 33 are opened, and the inlet of the blower pipe 14 is expanded to the maximum. The drive unit 34 uses a stepping motor, a solenoid, a motor and gears, a cam, etc., and uses a closing damper 32 and an upper damper 33.
Are configured to perform each operation,
The drive part of the drive device 34 is connected to the closing damper 32 and the upper damper 33.

Reference numeral 36 is a heating means of the vaporizer 13, which is the vaporizer 1
It is composed of an electric heating element such as a nichrome wire or a kanthal wire cast in No. 3. 37 is a vaporizer temperature detection unit for detecting the temperature of the vaporizer 14, and is composed of a thermistor, a thermocouple, and the like. Reference numeral 38 is a control unit that keeps the vaporizer 13 at a predetermined temperature by turning on and off the heating means 36 based on a signal from the vaporizer temperature detection unit 37. The control unit 38 controls the fuel pump 10 and the blower 2 depending on the instruction of the operation switch and the size of the load.
It is provided to control 8 in a proper state.
Reference numeral 39 denotes a temperature detection unit installed on the outer wall at the bottom of the transfer passage 17, which is composed of a thermistor, a thermocouple, etc., and is installed on the outer wall of the transfer passage 19 communicating with the downstream side of the carburetor 13. In response to the signal from the temperature detection unit 39, the control unit 38 changes the temperature setting of the carburetor 13 during standby for preheating, adjusts the amount of heat transferred from the carburetor 13 to the transport passage 17, and adjusts the temperature of the transport passage 17. Is controlled.

Reference numeral 40 denotes a flame formed on the flame nozzle 18, 41
Is a flow of air, and 42 is a flow of combustible vaporized gas.

The operation and action of the combustion device having the above-described structure will be described below. First, when a power source (not shown) is turned on, the heating means 36 is energized to heat the vaporizer 13. When the vaporizer 13 reaches a predetermined temperature, the vaporizer temperature detector 37 detects the temperature, and the controller 3
According to the instruction of 8, the heating means 36 is turned on and off to preheat while keeping the temperature of the vaporizer 13 constant.

At this time, when the vaporizer 13 and the transfer passage 17 heat the vaporizer 13 from a value close to room temperature or outside temperature,
The preheating temperature of the carburetor 13 is a temperature at which the rated combustion amount (maximum combustion amount) of liquid fuel (mainly kerosene) can be reliably vaporized (for example, 2
20 to 240 ° C.), the temperature of the transfer passage 17 is
Since the vaporized gas 42 of the liquid fuel has not reached the temperature (for example, 100 to 120 ° C.) where dew does not condense on the inner wall of the transfer passage 17, the value of the temperature detection unit 39 provided in the transfer passage 17 is the temperature at which the vaporized gas 42 does not dew. Until the operation is reached, and the carburetor 13 is set to a temperature as high as possible (for example, 280 to 300 ° C at which liquid fuel does not boil on the inner wall of the carburetor 13 and vaporization is delayed). Then, the temperature of the transport passage 17 is quickly raised. After that, until the operation is started, the temperature of the transfer passage 17 is monitored by the temperature detection unit 39, and the preheating temperature of the vaporizer 13 is controlled to a temperature at which the vaporized gas 42 does not condense on the inner wall of the transfer passage 17. If the temperature of the transfer passage 17 rises and the vaporized gas 42 can be maintained at a temperature where dew does not condense on the inner wall of the transfer passage 17, the setting of the preheating temperature of the carburetor 13 is lowered to reduce power consumption.

When the operation is started, the blower 28 is operated by the instruction of the control unit 38 and the combustion air is supplied. The air 41 supplied to the air passage 29 is a vaporization air conditioner 3
After the amount of air is adjusted by the first closing damper 32 and the upper damper 33, the air is divided into primary air supplied into the blower pipe 14 and secondary air supplied into the secondary air passage 22. At the same time, the fuel pump 10 operates and fuel is sprayed from the fuel supply nozzle 11 to the carburetor 13. The fuel is vaporized on the wall surface of the high temperature vaporizer 13 and is mixed with the air 41 supplied through the blower pipe 14 and is conveyed to the conveyance passage 17 through the mixture gas jet port 16 to become a uniform combustible vaporized gas 42. Sent to the flame mouth 18.

Further, the combustible vaporized gas 42 ejected from the flame nozzle 18 is ignited by an ignition electrode (not shown) which has been spark-discharged in advance, and a flame 40 is formed to start combustion.

Thereafter, the heat of the flame 40 is received by the heat receiving portion 25 of the vaporizer 13, and the vaporizer 13 is heated. The state of the flame 40 formed on the flame port 18 is monitored by a flame detection unit (frame rod: not shown) to maintain stable combustion. In addition, the high temperature combustion gas generated by combustion is the heat exchanger 2
Heat is exchanged at 6 and discharged.

When the operation is stopped and the preheat standby state is reached, the carburetor 13 and the transfer passage 17 have high temperatures, so the temperature of the carburetor 13 during the preheat standby is lowered and the transfer passage 17 is stopped.
Until the vaporized gas 42 reaches a temperature below which condensation does not occur on the inner wall of the transfer passage 17, the preheating temperature of the vaporizer 13 is lower than the temperature at which the rated combustion amount (maximum combustion amount) is reliably vaporized (for example, 170 to 190 ° C.) to increase the reduction in power consumption. At this time, the controller 38 gives an instruction to start the operation.
If the temperature of the transfer passage 17 reaches a temperature at which the vaporized gas 42 does not condense on the inner wall of the transfer passage 17, the preheating standby temperature of the carburetor 13 is increased, and the rated combustion amount of the liquid fuel becomes The temperature is raised in a short time to the temperature at which it can be reliably vaporized.

As described above, in this embodiment, the vaporizer 13 for vaporizing the liquid fuel, the transfer passage 17 communicating with the downstream side of the vaporizer 13, and the flame installed downstream of the transfer passage 17 are connected. 18 for forming a passage and the transfer passage 1
7, a temperature detecting section 39 provided in a part of 7, and the temperature detecting section 3
The control unit 38 for changing the control temperature of the carburetor 13 in the standby state for preheating in response to the signal of No. 9 is used to change the outside air temperature due to the change of climate and the temperature between regions of cold regions and high temperature regions. Even if a temperature difference occurs in the transfer passage 17 due to the difference, the control unit 38 that receives the signal from the temperature detection unit 39 changes the preheat standby temperature of the carburetor 13 to change the amount of heat transferred from the carburetor 13 to the transfer passage 17. By changing the temperature, it is possible to prevent the vaporized gas 42 from condensing in the transport passage 17 and prevent the generation of white smoke when the operation is stopped and the combustion failure due to the fuel pool during the operation.

In this embodiment, the temperature of the transfer passage 17 is accurately detected by the temperature detecting section 39 so that the preheating temperature of the carburetor 13 does not adversely affect the operation of the carburetor 13 at the start of the operation. Since the temperature can be lowered to an extremely low temperature, the power consumption of the carburetor 13 during standby for preheating can be greatly reduced.

Further, in this embodiment, the vaporizing air conditioner 3 is used.
1 is provided in the blower passage 29, and the primary air amount introduced into the blower pipe 14 in the mode including the region in which the combustion amount is maximum, in the mode including the region in which the combustion amount is minimum, and in the intermediate mode thereof, respectively. By adjusting in stages, the combustion amount adjustment range can be greatly expanded, and good wind resistance performance can be maintained in this wide adjustment range.

Further, by closing the closing damper 32 and the upper damper 33 of the vaporizing air conditioner 31 of this embodiment while the vaporizer 13 is in the preheating standby state, the vaporizer 13 and the transfer passage 17 are closed.
It is possible to prevent lowering of the temperature and reduce power consumption.

Further, the blower 28 of this embodiment is replaced with the vaporizer 13
The temperature of the transfer passage 17 can be raised in a short time by operating during the preheating standby time and applying the heat of the carburetor 13 as warm air to the transfer passage 17.

Further, depending on the temperature of the transfer passage 17, the blower 2
By changing the rotation speed of 8, when the temperature of the transfer passage 17 is likely to be high in the summer or the like, a small amount of air is sent to the carburetor 13 to reduce heat dissipation and reduce the power consumption of the carburetor 13 during standby for preheating. It can be reduced.

(Embodiment 2) A combustion apparatus according to Embodiment 2 of the present invention has the same basic configuration as that of Embodiment 1 shown in FIG. 1, except that the temperature of the control unit 38 and the temperature detection unit 39 is different. When the operation is performed when the temperature is equal to or lower than the predetermined temperature, until the temperature detection unit 39 indicates the value equal to or higher than the predetermined temperature,
The point is that an operation for driving a designated small amount of combustion is provided.

The operation and action of the combustion device having the above structure will be described below. Transport passage 1
Even if 7 is a temperature at which the vaporized gas 42 is condensed on its inner wall, the operation is started with a small amount of combustion with a small amount of dew condensation in the transfer passage 17 (for example, the amount of combustion is the amount of combustion in the mode of the intermediate region), The flame 40 is formed in the flame port 18, the carburetor 13 is heated by the combustion heat, the heat is transmitted to the transfer passage 17, and the radiant heat of the flame 40 formed in the flame port 18 is transferred to another portion of the transfer passage 17. Is heated to raise the temperature of the transfer passage 17 and prevent condensation even if a large amount of the vaporized gas 42 having the rated combustion amount (maximum combustion amount) flows into the transfer passage 17 thereafter.

As described above, in this embodiment, since the operation of the temperature of the transfer passage 17 can be started from the temperature at which the vaporized gas 42 is condensed, the power consumption of the carburetor 13 during the preheating standby can be greatly reduced. It is possible to prevent the occurrence of white smoke at the time of operation stop and combustion failure due to fuel accumulation during operation.

(Third Embodiment) A combustion apparatus according to a third embodiment of the present invention has the same basic configuration as that of the first embodiment shown in FIG. 1 except that the control unit 38 and the temperature detecting unit 39 are different in temperature. When the operation is performed when the temperature is equal to or lower than the predetermined temperature, until the temperature detection unit 39 indicates the value equal to or higher than the predetermined temperature,
The point is that an operation for raising the voltage of the heating means 36 of the vaporizer 13 is provided.

The operation and action of the combustion apparatus having the above structure will be described below. Transport passage 1
Even if 7 is the temperature at which the vaporized gas 42 is condensed on its inner wall, by increasing the voltage of the heating means 36 of the vaporizer 13, the amount of electric power is increased and the temperature of the vaporizer 13 is rapidly raised. The amount of heat combined with the heat of heating the carburetor 13 by the combustion heat is transmitted to the transfer passage 17 to heat the transfer passage 17 in a short time, and then even if a large amount of vaporized gas with a rated combustion amount flows into the transfer passage, dew condensation occurs. I try not to wake it up.

As described above, in this embodiment, since the operation of the temperature of the transfer passage 17 can be started from the temperature at which the vaporized gas 42 is condensed, the power consumption of the carburetor 13 during the preheating standby can be greatly reduced, It is possible to prevent the occurrence of white smoke at the time of operation stop and combustion failure due to fuel accumulation during operation.

Further, since the heating amount of the vaporizer 13 itself is increased in addition to the heating of the transport passage 17 by the combustion heat through the vaporizer 13, the vaporized gas 42 does not condense in the transport passage 17 in a shorter time. The temperature can be reached and usability can be improved. Further, since the vaporizer 13 can also raise the temperature in a short time, the temperature during the preheating standby can be further lowered,
The reduction in power consumption can be increased.

(Fourth Embodiment) FIG. 2 shows a combustion apparatus according to a fourth embodiment of the present invention, which has the same basic structure as that of the first embodiment. The difference is that the control unit 38 has a temperature detecting unit 39.
This is a point where the temperature is corrected by the value of the air supply detection unit 43 to change the control temperature of the carburetor 13 during standby for preheating.
The air supply detection unit 43 includes a thermistor, a thermocouple, and the like, and is provided near the air inlet or the outlet of the blower 28.

The operation and action of the combustion device having the above structure will be described below. Even when the temperature of the transport passage 17 is a temperature at which dew condensation of the vaporized gas 42 does not occur at the start of operation, a large amount of low-temperature outside air flows in,
By predicting that the transport passage 17 will be cooled from the value of the supply air temperature detection unit 43, and raising the temperature of the carburetor 13 during standby for preheating, the temperature of the transport passage 17 is raised,
After that, even if a large amount of vaporized gas 42 having a rated combustion amount flows into the transfer passage, dew condensation is prevented.

As described above, in the present embodiment, when the difference between the temperature of the transfer passage 17 and the outside air temperature is very large in the cold region and in the winter season, low temperature air flows into the carburetor 13. Since the vaporized gas 42 itself is likely to condense and easily cause dew condensation, the temperature of the transfer passage 17 is raised, so that it is possible to prevent the occurrence of white smoke when the operation is stopped and the combustion failure due to the fuel pool during the operation.

(Fifth Embodiment) FIG. 3 shows a combustion apparatus according to a fifth embodiment of the present invention, and the basic construction is the same as that of the first embodiment. The difference is that a second temperature detector 44 including a thermistor, a thermocouple, etc. is provided in the transfer passage 17 below the flame port 18.

The operation and action of the combustion device having the above-described structure will be described below. Control unit 38
Grasps the temperature distribution in a wide range of the conveyance passage 17 from the signals of the temperature detection unit 39 and the second temperature detection unit 44, and determines the presence or absence of dew condensation in the conveyance passage 17.

As described above, in the present embodiment, since the temperature distribution of the portion of the transfer passage 17 that is likely to receive the heat of the carburetor 13 and the portion that is susceptible to the combustion heat is measured, the transfer passage 1
The temperature of No. 7 can be accurately grasped, the heating via the carburetor 13 can be performed accurately, and the power consumption can be reduced by lowering the preheating standby temperature of the carburetor 13.

(Sixth Embodiment) FIG. 4 shows a combustion apparatus according to a sixth embodiment of the present invention, which has the same basic structure as that of the first embodiment. The difference is that the control unit 38 predicts the temperature of the transfer passage 17 by the value of the supply air temperature detection unit 45 and gives an instruction. The supply air temperature detection unit 45 includes a thermistor, a thermocouple, and the like, and is provided near the air inlet or the outlet of the blower 28.

The operation and action of the combustion apparatus having the above structure will be described below. Control unit 38
However, the temperature of the carburetor 13 is corrected during standby for preheating based on the value of the supply air temperature detection unit 45, but the original function of the supply air temperature detection unit 45 is to change the outside air temperature due to climate change. Since the data of the air amount adjustment for grasping the height and reducing the fluctuation of the flame 40 on the flame nozzle 18 is collected,
Using this data, for example, in summer when the supply air temperature is likely to rise, the temperature of the carburetor 13 during preheating standby is estimated to be lower, and in winter when the supply air temperature is lower, the temperature during preheating standby is estimated to be higher. Has been corrected to.

As described above, in the present embodiment, the temperature of the transfer passage 17 is predicted by using the existing supply air temperature detector 45, and the temperature of the carburetor 13 in the preheating standby state is changed,
By controlling the temperature of the transport passage 17 to a temperature that does not cause dew condensation, the temperature during standby for preheating is lowered in summer when the temperature is high to reduce power consumption, and the temperature during standby for preheating is reduced in the winter when the temperature is low. To prevent white smoke and fuel accumulation.

Even if a new temperature detecting structure is not provided, the existing supply air temperature detecting section 45 is utilized to reduce the power consumption during the preheating standby of the carburetor 13 while the operation is stopped. It is possible to prevent combustion failure due to generation of white smoke and fuel accumulation during operation.

(Embodiment 7) FIG. 5 shows a combustion apparatus according to Embodiment 7 of the present invention, and the basic construction is the same as that of Embodiment 1. The difference is that the control unit 38 predicts the temperature of the transfer passage 17 by the value of the outside air temperature detection unit 46 and gives an instruction. The outside air temperature detection unit 46 is composed of a thermistor, a thermocouple, and the like, and is provided in a part of the exterior and parts of the air supply and exhaust.

The operation and action of the combustion device configured as described above will be described below. At the start of operation, the outside temperature detected by the outside temperature detector 46 (weather and climate)
The temperature of the transport passage 17 is predicted from the above, and it is predicted that the transport passage 17 will be cooled by a large amount of low-temperature supply air flowing in the winter season. The temperature of the container 13 during standby for preheating is increased, and the temperature of the transfer passage 17 is increased.

As described above, in the present embodiment, it is possible to easily control the temperature of the transfer passage 17 according to the climate, and it is possible to prevent the generation of white smoke when the operation is stopped and the combustion failure due to the fuel pool during the operation.

(Embodiment 8) FIG. 6 shows a combustion apparatus according to Embodiment 8 of the present invention, and the basic construction is the same as that of Embodiment 1. The difference is that the control unit 38 predicts the temperature of the transfer passage 17 by the value of the timer means 47 and gives an instruction. The timer means 47 is composed of a memory, a counter, and a clock (including a radio-controlled clock) connected to the control unit 38.

The operation and action will be described below. At the start of the operation, the climate is judged from the lapse of time of the timer means 47, the temperature of the transfer passage 17 is assumed, the temperature of the carburetor 13 in the preheating standby state is changed, the temperature of the transfer passage 17 is changed, and the transfer passage is changed. At 17, the temperature is set to a temperature at which the vaporized gas 42 does not condense.

As described above, in this embodiment, the timer means 47 can be constituted by simple parts in the control section 38,
It is possible to prevent the occurrence of white smoke at the time of operation stop and combustion failure due to fuel accumulation during operation.

[0060]

As described above, according to the invention described in claims 1 to 8, the temperature of the transfer passage is different due to the change of the outside air temperature due to the change of climate and the temperature difference between the regions of cold regions and high temperature regions. Even if occurs, the control unit that receives the signal from the temperature detection unit changes the preheat standby temperature of the carburetor and changes the amount of heat transferred from the carburetor to the transfer passage to maintain a temperature at which vaporized gas does not condense in the transfer passage. In addition, combustion failure due to white smoke generation and fuel accumulation can be prevented, and power consumption can be accurately reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a combustion device according to first to third embodiments of the present invention.

FIG. 2 is a sectional view of a combustion device according to a fourth embodiment of the present invention.

FIG. 3 is a sectional view of a combustion device according to a fifth embodiment of the present invention.

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

FIG. 5 is a sectional view of a combustion device according to a seventh embodiment of the present invention.

FIG. 6 is a sectional view of a combustion apparatus according to an eighth embodiment of the present invention.

FIG. 7 is a sectional view of a conventional combustion device.

[Explanation of symbols]

13 Vaporizer 17 Transport passage 18 flame mouth 38 Control unit 39 Temperature detector 40 flames 43, 45 Air supply temperature detector 44 Second temperature detector 46 Outside temperature detector 47 timer means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiichi Shinoda             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3K052 AA02 AA05 AA06 AA09 AB14                       AC05 EB07 GA02 GA05 GA06                       GA09 GC01 GE07

Claims (8)

[Claims] 1. A vaporizer for vaporizing liquid fuel, a transport passage communicating with a downstream side of the vaporizer, a flame port provided downstream of the transport passage for forming a flame, and a part of the transport passage. And a control unit for receiving a signal from the temperature detection unit and changing the control temperature of the carburetor during standby for preheating. 2. The control unit, when the operation is performed when the temperature detection unit shows a value equal to or lower than a predetermined temperature, until the temperature detection unit shows a value equal to or higher than a predetermined temperature, the control unit burns a specified small amount of combustion. The combustion device of claim 1, wherein the combustion device operates at a volume. 3. The controller controls the heating means of the carburetor until the temperature detector shows a value equal to or higher than a predetermined temperature when the operation is performed when the temperature detector shows a value equal to or lower than a predetermined temperature. The combustion device according to claim 1, wherein the voltage is increased. 4. The control unit corrects the temperature of the temperature detection unit according to the value of the supply air temperature detection unit, and changes the control temperature during standby for preheating of the carburetor. Combustion device as described. 5. The combustion apparatus according to claim 1, wherein a plurality of temperature detection units are provided in the transfer passage. 6. The combustion apparatus according to claim 1, wherein the control unit predicts the temperature of the transfer passage based on the value of the supply air temperature detection unit and gives an instruction. 7. The combustion apparatus according to claim 1, wherein the control unit predicts the temperature of the transfer passage based on the value of the outside air temperature detection unit and gives an instruction. 8. The combustion apparatus according to claim 1, wherein the control unit predicts the temperature of the transfer passage based on the value of the timer means and gives an instruction.