JPH11193905A - Liquid fuel combustor, hot water supply apparatus or bath furnace with liquid fuel combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure without requiring any countermeasure against corrosion due to condensate by disposing a fan oppositely to the fixing position of a vaporizer so that secondary air flows into a secondary air passage from the opposite sides and ejecting flame downward. SOLUTION: Outdoor air supplied into an air supply passage 3 by means of a fan 18 flows into a secondary air passage 11 and the air required for combustion is supplied from a secondary air port 13 to a burner port 5. Remaining outdoor air in the passage 3 is supplied, as secondary air, to a combustion room 2 from a second secondary air port 17 made through the inner circumferential wall 15 of the passage 3 in order to accelerate combustion. When combustion is started, temperature on the wall 15 of the combustion room 2 increases due to combustion heat and the outdoor air being supplied into the passage 3 by means of the fan 18 robs heat from the wall 15 when it advances from the passage 3 to a primary air port 8 and preheated air is supplied to a vaporizer 6. Furthermore, fins at a heat receiving part 9 formed on the vaporizer 6 is heated by combustion heat and the temperature of the vaporizer 6 is held at a specified level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device using petroleum as a fuel, and a water heater or a bathtub with the water heater provided with the liquid fuel combustion device. The present invention relates to a water heater or a bathtub with a water heater in which a liquid fuel combustion device is mounted above a heat exchanger to improve maintainability.

[0002]

2. Description of the Related Art Heretofore, the following has been disclosed as a liquid fuel combustion apparatus for vaporizing liquid fuel oil and burning it. a. The applicant has filed an application as Japanese Patent Application No. 9-337835 (hereinafter referred to as "A"), in which the flame is blown upward from the bottom, and the position of the air blown into the air passage of the blower is further adjusted. Liquid fuel combustion device on the carburetor side. b. In a liquid fuel combustion device disclosed in Japanese Patent Application Laid-Open No. 9-159112 (hereinafter referred to as "B"), heat exchange is installed above the liquid fuel combustion device so that a flame is ejected upward from below. A liquid fuel combustion device including a first air ejection section 42 and a second air ejection section 45 as a countermeasure against dew condensation of a vessel. c. In a liquid fuel combustion device disclosed in Japanese Patent Application Laid-Open No. 5-126318 (hereinafter referred to as "C"), the material of a mixing chamber is made of aluminum,
Liquid fuel combustion device made of a material with high thermal conductivity such as copper.

[0003]

However, the above-described conventional liquid fuel combustion apparatus has the following problems. In the liquid fuel combustion device described in JP-A No. 1993, measures for dew condensation generated in the heat exchanger above the liquid fuel combustion device were not taken, and condensed water having high acidity was discharged on the flame outlet and the secondary air passage. It fell on the board and was expected to corrode in the future. In addition, since the blower was installed on the carburetor side, low-temperature air was blown directly to the carburetor through the primary air port, and the power consumption of the heater to maintain the carburetor temperature was large. there were. In the liquid fuel combustion device described in Japanese Patent Application Laid-Open Publication No. H08-187, although dew condensation measures are taken, excess air is blown into the combustion chamber from the perforated first air ejection part and second air ejection part as a measure against dew condensation, resulting in reduced thermal efficiency. In addition, since the guide pieces are attached to the first air ejection portion and the second air ejection portion, the structure becomes complicated. The liquid fuel combustion device described in the publication No. C has a problem that it is necessary to select a special material having a high thermal conductivity in order to prevent the oil vaporized by the vaporizer from dewing and accumulating again in the mixing chamber. Was.

The present invention solves the above-mentioned conventional problems and does not require any countermeasures against corrosion due to dew condensation water, has a simple structure, is excellent in productivity, consumes low power, and is excellent in maintainability of a burner portion. It is an object to provide a liquid fuel combustion device.

[0005]

In order to solve the above-mentioned conventional problems, a liquid fuel combustion apparatus according to the present invention comprises a fuel supply means for supplying liquid fuel, a nozzle for ejecting the supplied liquid fuel, and the nozzle A vaporizer that heats and vaporizes the liquid fuel ejected from the air, and a blower that supplies combustion air,
A blower path connected to the blower, a primary air port extending from the blower path to near the vaporizing surface of the vaporizer, a mixing chamber connected downstream of the vaporizer, and the mixing chamber. A plurality of flame ports for burning the air-fuel mixture, a secondary air passage provided between the flame hole and the flame hole in the lower part of the mixing chamber, and a secondary air passage frame forming the secondary air passage were perforated. A secondary air port, a secondary air port is disposed between the flame port and the flame port, the flame port is arranged substantially parallel to the vaporizer, and the secondary air passage is provided with a secondary air port from both sides. The configuration is such that the next air flows in, the blower is arranged on the side facing the carburetor mounting position, and the flame is blown downward.

[0006]

[Embodiment 1] Hereinafter, an embodiment of a liquid fuel combustion apparatus according to the present invention will be described with reference to the drawings. FIG.
FIG. 2 is a cross-sectional side view of a main part of the liquid fuel combustion apparatus according to the embodiment, FIG. 2 is a bottom view of the main part of the liquid fuel combustion apparatus according to the embodiment, FIG. 3 is a cross-sectional view taken along line AA in FIG. Is a sectional view taken along the line BB in FIG. 1, and FIG. 5 is a perspective view of the vaporizer.

In the drawing, reference numeral 1 denotes a liquid fuel combustion apparatus according to the embodiment, 2 denotes a combustion chamber of the liquid fuel combustion apparatus, 3 denotes a hollow ventilation path surrounding the combustion chamber, and 4 denotes a flame port 5 on the downstream side. A mixing chamber, 6 is a vaporizer fixed to one end of the mixing chamber 4 and heats and vaporizes the liquid fuel, 7 is a vaporizer lid covering the opening of the vaporizer 6, and 8 is formed by projecting into the vaporizer lid 7 to blow air. A primary air port 9 extending from the passage 3 to the vicinity of the vaporizing surface 6 b of the vaporizer 6, a heat receiving portion 9 protruding below the flame port 5 and formed of fins formed on an outer surface of the vaporizer 6, and a heat receiving portion 10. Nozzles 14 to be described later are formed by protrusions protruding from the inner surface of the
It is preferable to provide a plurality of them below the center, and preferably to provide a plurality of steps in a staggered manner. Reference numeral 11 denotes a secondary air passage provided between the flame ports 5 at the lower portion of the mixing chamber 4, 12 denotes a secondary air passage frame forming the secondary air passage, and 13 denotes a hole formed in the secondary air passage frame. A secondary air port 14 disposed between the flame ports 5, a nozzle 14 disposed at the primary air port 8 and jetting liquid fuel into the carburetor 6, 15 an inner peripheral wall of the air passage 3, 16 is an outer peripheral wall of the air passage 3, 17 is a second secondary air port perforated in the inner peripheral wall 15,
Reference numeral 18 denotes a blower connected to the outer peripheral wall 16 for blowing combustion air to the air passage 3, reference numeral 19 denotes an inspection lid for inspecting and cleaning the vaporizer, and reference numeral 20 denotes a heat insulating material for preventing the cooling of the mixing chamber.

The mixing chamber 4 is provided with a vaporizer 6 for ejecting and burning the mixed vaporized gas almost uniformly in all the flame ports 5.
It is formed so that the cross-sectional area decreases as the distance from the object increases. The secondary air port 13 is arranged between the flame ports to supply the secondary air evenly to the flame port 5.

The combustion operation of the liquid fuel combustion apparatus configured as described above will be described below. Liquid fuel such as petroleum supplied to the nozzle 14 through the oil supply pipe 14a by the fuel supply device 30 such as a pump is ejected from the nozzle 14 into the inside of the vaporizer 6 heated by the electric heater 6a or the like, and heated by the vaporizer 6. Vaporized. Part of the outside air supplied into the air passage 3 by the air blower 18 is supplied as primary air from the air passage 3 to the carburetor 6 through the primary air port 8 through the air passage 3 surrounding the periphery of the combustion chamber. Vaporizer 6
The liquid flows into the mixing chamber 4 while being mixed with the liquid fuel vaporized in the step (a). Next, the air-fuel mixture that has flowed into the mixing chamber 4 is blown out from the flame port 5 and ignited by an igniter (not shown) to be
Combustion.

On the other hand, outside air supplied into the air passage 3 by the blower 18 flows into the secondary air passage 11 and sends air required for combustion from the secondary air port 13 to the flame port 5. The remainder of the outside air supplied into the air passage 3 is supplied to the combustion chamber 2 as secondary air from a second secondary air port 17 formed in the inner peripheral wall 15 of the air passage 3 to promote combustion.

When the combustion is started, the inner peripheral wall 15 of the combustion chamber 2
Temperature rises due to the combustion heat, but the outside air supplied from the blower 18 into the air passage 3 flows from the air passage 3 to the primary air port 8.
The heat of the inner peripheral wall 15 is taken away before reaching
Is supplied with warm air.

When the combustion is started, the fins of the heat receiving portion 9 formed in the vaporizer 6 are heated by the combustion heat, and the vaporizer 6 is maintained at a predetermined temperature. In addition, as for the adjustment of the calorific value, the fuel supply device 3 such as a pump to which the nozzle 14 is connected is used.
This is performed by changing the pulse width, frequency, etc. applied to 0.

[Embodiment 2] An embodiment of a water heater using a liquid fuel combustion apparatus according to the present invention will be described below with reference to FIG. The liquid fuel combustion device 1 is placed on the water heater combustion chamber 21, and the heat exchanger 2 is placed below the water heater combustion chamber 21.
2, the exhaust flue 23 is provided from the lower part to the side part of the heat exchanger 22, and is controlled by a control circuit 26 electrically connected to the water amount sensor 24, the temperature detector 25 and the like. is there. The exhaust flue 23
In many cases, sound absorbing materials and devices are incorporated.

When a hot water tap (not shown) provided in a washroom, a kitchen or the like is opened, a water quantity sensor 24 is activated, and the oil flowing into the leveler 29 from the oil tank 28 is fed to a fuel supply device 30 such as a pump. It is pressurized and sent to the liquid fuel combustion device 1 for combustion. The combustion gas heats water in a heat exchanger 22 below the water heater combustion chamber 21, and the exhaust gas is discharged outside the device through an exhaust flue 23.

A tapping temperature is detected by a temperature detector 25 provided at an outlet of the heat exchanger 22, and a control signal is inputted from a control circuit 26 to a fuel amount driving circuit 27 so as to be equal to the set tapping temperature. The fuel oil amount drive circuit 27 outputs the pulse width or frequency to the fuel supply device 30 based on the signal so as to decrease the pulse width or frequency when the amount of combustion is too large, or to increase the amount when the amount of combustion is too small. It controls so that it becomes. In the case of a bath kettle with a water heater, a bath burner and a heat exchanger are added to the water heater.

[0016]

As described above, the liquid fuel combustion apparatus according to the embodiment has the following functions. Since the direction in which the liquid fuel blown into the vaporizer flows and the direction in which the vaporized gas flows out are opposite, only the completely vaporized gas flows out of the mixing chamber to the flame outlet. In addition, since a plurality of projections are provided below the center of the nozzle on the inner surface of the vaporizer, the oil that has collided with the vaporization surface flows laterally along the projections without flowing down as it is, and the oil flows downward from the cut of the projections. This has the effect that the kerosene in liquid state can be completely vaporized. Further, since the dewed petroleum does not accumulate in the mixing chamber again, there is no need to select a special material as the material of the mixing chamber.

The flame port is disposed substantially parallel to the vaporizer, and a space between the flame ports at the lower portion of the mixing chamber is defined as a secondary air passage, and secondary air flows into the secondary air passage from both sides. Therefore, the flow distance of the secondary air can be short. This has the effect that the cross-sectional area of the secondary air passage can be reduced.

When the vaporized gas of the liquid fuel is combusted at the flame port, the secondary air is uniformly supplied from the secondary air port disposed between the flame ports.

Since the cross-sectional area of the mixing chamber is made smaller as it goes away from the vaporizer, it has the effect of causing the mixed gas to be ejected almost uniformly at all the flame outlets and burning it.

According to the second aspect of the present invention, the position of blowing air from the blower into the air passage is on the side opposite to the carburetor mounting position, so that the primary air is preheated and supplied to the carburetor. This has the effect of promoting the vaporization of petroleum and making it easy to complete combustion.

According to the third aspect of the present invention, since the liquid fuel combustion device is mounted on the heat exchanger, the liquid fuel combustion device can be easily attached and detached. It has the action of:

[0022]

As described above, according to the liquid fuel combustion apparatus of the present invention, the following excellent effects can be realized. (1) Since the direction in which the liquid fuel blown into the vaporizer flows and the direction in which the vaporized gas flows out are reversed, only the completely vaporized gas flows out of the mixing chamber to the flame outlet. Was. (2) Since a plurality of projections are provided below the center of the nozzle on the inner surface of the vaporizer, the oil that has collided with the vaporization surface flows laterally along the projections without flowing down as it is, and the cuts in the projections From the bottom. Thereby, the liquid kerosene can be completely vaporized. (3) Since the dewed petroleum does not accumulate in the mixing chamber, there is no need to select a special material as a material for the mixing chamber. (4) The flame outlet is arranged substantially parallel to the carburetor mounting part, and the periphery of the flame outlet is used as a secondary air passage. Secondary air flows from both sides into the secondary air passage, so that the secondary air flows. The distance is short. This makes it possible to reduce the cross-sectional area of the secondary air passage, thereby achieving compactness. (5) When the vaporized gas of the liquid fuel is burned at the flame port, the secondary air is uniformly supplied from the secondary air port disposed between the flame port and the combustion state is improved, and the combustion is improved. The sound has also been reduced. (6) Since the cross-sectional area of the mixing chamber becomes smaller as it goes away from the vaporizer, the mixed gas can be almost uniformly ejected from all the flame outlets and burned. (7) According to the liquid fuel combustion device of the second aspect, since the position of blowing air from the blower to the blow path is on the side facing the carburetor mounting position, the primary air is preheated and supplied to the carburetor. As a result, oil vaporization was promoted and complete combustion became easier. (8) According to the water heater and the bathtub with the water heater according to claims 3 and 4, the liquid fuel combustion device is mounted on the upper part of the heat exchanger, so that the liquid fuel combustion device can be easily attached and detached. Has become easier to maintain. (9) Since the liquid fuel combustion device is mounted on the upper part of the heat exchanger, the condensed water from the heat exchanger does not fall to the combustion part of the liquid fuel combustion device, and the life is extended. In addition, it is not necessary to provide a structure for dew condensation countermeasures in the combustion part, so that the structure can be simplified, and since there is no need to send extra air, the thermal efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part of a liquid fuel combustion device according to the present invention.

FIG. 2 is a bottom view of a main part of the liquid fuel combustion device according to the present invention.

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG. 1;

FIG. 5 is a perspective view of a vaporizer according to the present invention.

FIG. 6 is a sectional view of a main part showing one embodiment of a water heater using the liquid fuel combustion device according to the present invention.

FIG. 7 is a block diagram of a fuel oil amount control circuit of the liquid fuel combustion device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid fuel combustion apparatus 2 Combustion chamber 3 Ventilation path 4 Mixing chamber 5 Flame port 6 Vaporizer 6a Electric heater 6b Vaporization surface 7 Vaporizer lid 8 Primary air port 9 Heat receiving part 10 Projection part 11 Secondary air path 12 Secondary air path Frame 13 Secondary air port 14 Nozzle 14a Oil supply pipe 15 Inner peripheral wall 16 Outer peripheral wall 17 Second secondary air port 18 Blower 19 Inspection lid 20 Insulation material 21 Water heater combustion chamber 22 Heat exchanger 23 Exhaust flue 24 Water volume sensor 25 Temperature detector 26 Control circuit 27 Fuel oil amount drive circuit 28 Oil tank 29 Leveler 30 Fuel supply device

Claims (4)

[Claims] 1. A fuel supply means for supplying liquid fuel, a nozzle for ejecting the supplied liquid fuel, a vaporizer for heating and vaporizing the liquid fuel ejected from the nozzle, and a blower for supplying combustion air. A blower path connected to the blower, a primary air port extending from the blower path to near the vaporizing surface of the vaporizer, a mixing chamber connected downstream of the vaporizer, and the mixing chamber. A flame that burns the mixture
A secondary air passage provided at a lower portion of the mixing chamber and provided between the flame ports, and a secondary air port formed in a secondary air passage frame forming the secondary air path. A plurality of the flame outlets are arranged substantially in parallel with the carburetor, and the secondary air passage is a liquid fuel combustion device in which secondary air flows in from both sides. A liquid fuel combustion device, characterized in that the fuel is ejected toward the fuel. 2. The liquid fuel combustion apparatus according to claim 1, wherein a position of blowing air from the blower into the blow path is on a side facing a carburetor mounting position. 3. A water heater comprising the liquid fuel combustion device according to claim 1. 4. A bath kettle with a water heater provided with the liquid fuel combustion device according to claim 1.