JP3346042B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel device used for a water heater or a heater using petroleum as a fuel.

[0002]

2. Description of the Related Art A conventional liquid fuel combustion device has a low noise,
In order to reduce the size of the equipment and expand the range of adjusting the amount of combustion, a vaporization method in which liquid fuel is once vaporized and burned is adopted.

As shown in FIG. 3, in this vaporizing type combustion apparatus, liquid fuel introduced from a fuel tank 1 passes through an oil supply pipe 3 by a pump 2 for supplying the liquid fuel and passes through a nozzle 4
Is ejected to a vaporizer 6 having an electric heater 5 therein.
It is heated and vaporized. The vaporizer 6 is covered with a vaporizer cover 8 having a heat insulating material 7 on the inner surface to prevent heat radiation from the vaporizer 6. In addition, the temperature of the vaporizer 6 is measured by a detector 10 attached to a substantially central portion of the upper end of the vaporizer 6 and held by a holding bracket 9.
And the energization and de-energization of the electric heater 5 are repeated so that the temperature becomes constant. On the other hand, the combustion air is blown by the blower 11.
Part of the gas passes through the air passage 12 and is introduced into the vaporizer 6.
The fuel is mixed with the vaporized fuel to form a combustible mixture, which is uniformly mixed in the mixing chamber 13 to form a flame at the flame port 14 and burn. The remaining combustion air is supplied from the secondary air passage 15 to the flame outlet 14.
Is supplied to the secondary air port 16 provided near the
Stable combustion is performed by enclosing the flame formed in step 4.

[0004]

However, in the above-described conventional configuration, the detector 7 after the assembly of the liquid fuel combustion device is used.
Since the detector 10 is held by the holding metal fittings 9 in the mounting and dismounting, the holding metal fittings 9 may be mounted and removed. However, since the mounting portion of the detector 7 must be located at a position that is representative of the temperature distribution of the entire vaporizer 6, it is located substantially at the center of the upper end of the vaporizer 6. It becomes difficult to insert the detector 10 in close contact with the mounting portion by inserting it into the carburetor cover 8 having the heat insulating material 7 on the inner surface in order to prevent heat radiation.
There is a problem that the liquid fuel combustion device must be disassembled, the detector 10 must be attached and reassembled in order to bring the fuel cell into close contact. Further, if the detector 10 is mounted on the mounting portion of the vaporizer 6 with insufficient adhesion, the temperature of the vaporizer 6 rises more than necessary due to the detection delay of the detector 10, and the liquid fuel undergoes film boiling. Therefore, there is a problem that the vaporization is delayed and the vaporizer 6 is dissolved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to facilitate attachment and detachment of a detector after assembling a liquid fuel combustion apparatus, and to reliably bring the detector into close contact with a mounting portion of a carburetor.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pump for supplying liquid fuel, a nozzle for ejecting liquid fuel supplied from the pump, and heating and vaporizing liquid fuel ejected from the nozzle. A carburetor having an electric heater, a blower for supplying combustion air, an air passage connected to the blower, and a mixing chamber connected downstream of the carburetor,
A flame port for burning the air-fuel mixture formed in the mixing chamber, a secondary air port for supplying secondary air near the flame port, a burner head case that covers the flame port and the secondary air port and is connected to the vaporizer, A detector for detecting the temperature of the vaporizer, a burner case having a gap around the vaporizer and the burner head case to form a secondary air passage, an opening provided on a side surface of the burner case, It has a mounting part provided at the approximate center, and a guide plate that guides the insertion of the detector to the burner head case located at the top of the vaporizer to facilitate the insertion and fixing of the detector from the opening. is there. Further, a guide groove for guiding to the mounting portion is provided in the carburetor.

[0007]

According to the present invention, when the detector is mounted after assembling the liquid fuel combustion apparatus, the holding bracket for holding the detector is provided along the guide plate provided on the burner head case located above the carburetor. The detector can be easily attached in close contact with the mounting portion by inserting it along the guide groove for guiding to the mounting portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

1 and 2, reference numeral 17 denotes a fuel tank;
18 is a pump for supplying the liquid fuel, 19 is a nozzle for ejecting the supplied liquid fuel, 20 is the pump 18 and the nozzle 1
9 is a fuel supply pipe, 21 is a vaporizer heated and vaporized by an electric heater 22 having liquid fuel ejected from the nozzle 16 therein, 23 is a detector for controlling the temperature of the vaporizer 21,
24 is a holding bracket for holding the detector 23; 21a is a mounting portion of the vaporizer 21 of the detector 23 held by the holding bracket 24;
21b is a guide groove to the mounting portion 21a of the detector 23 held by the holding fitting 24 provided on the vaporizer 21; 25 is a vaporizer cover having a heat insulating material 26 on the inner surface to prevent heat radiation of the vaporizer 21; 27 is a blower for supplying combustion air, 28
Is an air passage connected to the blower 27, 29 is a mixing chamber connected downstream of the vaporizer 21, 30 is a flame port for burning the air-fuel mixture formed in the mixing chamber 29, and 31 is a gas outlet near the flame port 30. A secondary air port for supplying the secondary air, a burner head case 32 covering the flame port 30 and the secondary air port 31 and connected to the vaporizer 21, and a burner head case 32 a provided on the upper part of the vaporizer 21 are provided on the burner head case 32. A guide plate 33 of the detector 23 held by the holding metal fittings 24, a burner case 33 having a gap around the carburetor 21 and the burner head case 32 to form a secondary air passage 34, and a burner case 33 Opening 33
This is a closing plate for closing a.

Next, the operation of the above configuration will be described.
The liquid fuel introduced from the fuel tank 17 passes through an oil supply pipe 20 by a pump 18 for supplying the liquid fuel, and is ejected from a nozzle 19 to a vaporizer 21 having an electric heater 22 therein, and is heated and vaporized. The temperature of the vaporizer 21 is detected by the detector 2
The detection is performed at 3 and the energization and non-energization of the electric heater 22 are repeatedly maintained. On the other hand, the combustion air passes through the air passage 28 by the air blower 27, and a part of the air is introduced into the vaporizer 21 and mixed with the vaporized fuel to form a combustible air-fuel mixture.
The mixture is uniformly mixed in the mixing chamber 29, and a flame is formed at the flame port 30 and burned. The remaining combustion air is supplied from the secondary air passage 34 to the secondary air port 31 provided near the flame port 30,
Stable combustion is performed by enclosing the flame formed by the flame port 30.

Here, when replacing the parts of the detector 23, the closing plate 35 attached to the burner case 33 is removed and the detector 23 is opened through the opening 33a of the burner case 33.
The detector 23 can be removed by removing the holding fitting 24 holding the. Next, when the detector 23 is to be reattached, the detector 23 is held by the holding fitting 24 and the mounting portion 21a of the vaporizer 21 is opened through the opening 33a of the burner case 33.
At this time, one side is a guide plate 32a on a burner head case 32 located above the carburetor 21, and the other is a mounting portion of the heat insulating material 26 on the inner surface of the carburetor cover 25 on the top of the carburetor 21. Since the portion located at 21a is notched, it serves as a guide for the holding fitting 24, and the holding fitting 24
Can be easily inserted, and can be attached in close contact with the attachment portion 21a of the vaporizer 21. Then, by attaching the closing plate 35 of the burner case 33, reassembly becomes possible.

When the detector 23 is to be reattached, the detector 23 is held by the holding metal fitting 24 and inserted into the mounting portion 21a of the carburetor 21 through the opening 33a of the burner case 33. Since the guide groove 21b is provided in the upper portion of the carburetor 21, the guide of the holding fitting 24 can be guided, the holding fitting 24 can be easily inserted, and can be attached in close contact with the mounting portion 21 of the vaporizer 21. By attaching the closing plate 35, reassembly becomes possible.

According to the structure of this embodiment, when replacing the parts of the detector 23, the detector 23 is held by the holding metal fitting 24 and inserted into the mounting part 21a of the vaporizer 21 through the opening 33a of the burner case 33. However, since the means for facilitating attachment and detachment of the detector 23 is provided, there is an effect that the liquid fuel combustion device does not need to be disassembled and reassembled, and the detector 23 and the vaporizer 21 are disassembled at the time of disassembly and reassembly. There is an effect that it is possible to prevent the liquid fuel from film boiling and delay in vaporization, or to prevent the vaporizer 6 from dissolving without obtaining the adhesion with the mounting portion 24.

[0014]

As described above, the liquid fuel combustion apparatus according to the present invention has an opening on the side surface of the burner case and a mounting portion provided substantially at the center of the carburetor, and holds the detector from the opening. Since the holding bracket is inserted along the guide plate provided in the burner head case located at the upper part of the vaporizer, and along the guide groove for guiding to the mounting part, the liquid is required when the detector is replaced. The fuel combustion device does not need to be disassembled and reassembled. In addition, it is possible to prevent the liquid fuel from film boiling and causing a delay in vaporization or dissolution of the vaporizer without assuring adhesion between the detector and the mounting portion during disassembly and reassembly.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a detector and a holding bracket according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional liquid fuel combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 18 Pump 19 Nozzle 21 Vaporizer 21a Attachment part 21b Guide groove 22 Electric heater 23 Detector 24 Holder 25 Vaporizer cover 26 Insulation material 32 Burner head case 32a Guide plate 33 Burner case 33a Opening 35 Closure plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/02 342 F23D 11/10

Claims (3)

(57) [Claims] 1. A pump for supplying a liquid fuel, a nozzle for ejecting the liquid fuel supplied from the pump, and a vaporizer having an electric heater therein for heating and vaporizing the liquid fuel ejected from the nozzle. A blower for supplying combustion air, a blower passage connected to the blower, a mixing chamber connected downstream of the vaporizer, and a flame port for burning a mixture formed in the mixing chamber, A secondary air port that supplies secondary air to the vicinity of the flame port, a burner head case that covers the flame port and the secondary air port and is connected to the vaporizer, and a gap around the vaporizer and the burner head case. A burner case having a secondary air passage, a detector for detecting the temperature of the carburetor, an opening provided on a side surface of the burner case, and a mounting portion provided at a substantially central portion of the carburetor. Having the detector attached to the mounting portion from the opening. Liquid fuel combustion apparatus, characterized in that inserted into and fixed. 2. The liquid fuel combustion apparatus according to claim 1, wherein a guide plate for guiding insertion of the detector is provided in a burner head case located above the vaporizer. 3. The liquid fuel combustion apparatus according to claim 1, wherein a guide groove provided in the vaporizer for guiding the detector to the mounting portion is provided.