JPH0330694Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a vaporizing combustion appliance equipped with a vaporizer cleaning function.

(Prior Art) Conventionally, this type of combustion appliance has a vaporizer made of die-cast aluminum having a heater and a vaporizing filter section, and a nozzle and a burner equipped with a needle shaft, and the vaporizer is preheated by a heater to a constant temperature. After reaching the temperature, the electromagnetic pump is driven, and the liquid combustion in the fuel storage section is sequentially supplied into the vaporization filter section through the fuel supply path, the supplied fuel is vaporized by the heat of the heater, and the vaporized gas is combusted from the nozzle. It is designed to be led to a burner together with the air for combustion. By the way, liquid fuel contains a small amount of heavy content, and when it vaporizes due to long-term use or misuse of bad fuel, tar is generated, and this tar is captured by the vaporization filter. It sticks to the surface. When tar adheres to the vaporizing filter section, the amount of vaporized gas guided to the nozzle decreases, which tends to cause problems such as a reduction in heating capacity, incomplete combustion, and the generation of pungent odors. In order to solve this problem, the vaporizing filter section has been designed to be replaceable, and the vaporizer has been equipped with a function to dry-clean the vaporizer in a non-combustion state.

(Problem that the invention aims to solve) However, due to the structure of this vaporizing combustion appliance, the vaporizer is used at high temperatures and must be placed inside the appliance, making it extremely difficult to create a replaceable structure. There is a problem. On the other hand, when dry-cleaning the vaporizer during non-combustion, raising the temperature of the vaporization filter to a temperature that burns out the tar will generate gas from vaporized tar, which has a strong pungent odor, making it difficult to carry out indoor cleaning. There is a problem that the dry firing cleaning work is complicated.

The present invention was developed based on the above-mentioned problems, and the object is to provide a vaporizing combustion appliance that can automatically and easily clean the vaporizer without causing almost any irritating odor when cleaning the vaporizer. That is.

[Structure of the invention] (Means for solving the problem) The present invention provides the burner 17 with a flame sensor 21 that detects flame current according to the burnup degree, and controls the heater 8 provided in the carburetor 5. A control means 24 is provided for raising the temperature of the vaporizer 5 to a temperature at which impurities such as tar can be thermally decomposed.

(Function) When the flame current value detected by the flame sensor 21 falls below a predetermined level, the control means 24 controls the heater 8 to increase the temperature of the carburetor 5 for a certain period of time while burning. Cleans by burning off adhering impurities.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figure 1 shows the entire fuel path in a vaporizing combustion appliance, where 1 is an oil receiver with a sealed structure, and a cartridge-type oil tank 2 for supplying fuel is mounted to maintain a constant oil level. . Reference numeral 3 denotes a fuel supply pipe, the suction side of which is immersed in fuel in the oil pan 1 via an electromagnetic pump 4 fixed to the top surface of the oil pan 1;
Its discharge side is connected to the fuel supply port 6 of the carburetor 5. This vaporizer 5 is formed of a base body 7 made of aluminum die-casting.

Reference numeral 8 denotes a heater for vaporizing fuel provided within the base body 7, and a vaporizing filter portion 9 formed of a wire mesh is filled on the outside of the heater 8 without any gaps. 1
0 is a thermistor provided in the base 7 and detects the temperature of the vaporizer 5. Reference numeral 11 denotes a nozzle that communicates with the vaporization filter section 9 via a communication pipe 12, and causes the vaporized gas sent from the vaporization filter section 9 to be ejected from the ejection port 13. Reference numeral 14 denotes a needle shaft which is provided to be movable back and forth within the nozzle 11 by a solenoid 15 so as to open and close the nozzle 13. During combustion, the nozzle 13 is opened and during non-combustion, the nozzle 13 is closed. The spout 13 is closed at least once for this purpose. Reference numeral 16 denotes a fuel return pipe, one end of which is connected to the solenoid 15 and the other end opened to the oil pan 1.

17 is a flat burner disposed on the front side of the vaporizer 5, and a cylindrical mixing pipe 18 and this mixing pipe 1
8, a horizontally elongated diffusion section 19 which is bent at right angles from one end of the section 8 and extends into a widening shape, and a gas blow-off section formed by a large number of slits drilled in the upper surface of this diffusion section 19. It consists of 20.
The opening end surface of the mixing tube 18 is spaced apart from and facing the jetting port 13 of the nozzle 11, and the vaporized gas spouted from the jetting port 13 and the primary air drawn from the opening end surface are mixed and sent to the gas blowing section 20. Sent. Reference numeral 21 denotes a flame sensor disposed above the gas blowing section 20, which detects a flame current value according to the burnup in the burner 17.

FIG. 2 shows a control circuit for the heater 8, and this embodiment uses a zero-cross method in which a power supply 23 is connected to the heater 8 via a triax 22, and the energization period of the heater 8 is changed by the triax 22. A control means 24 is connected to the thermistor 10 and the flame sensor 21 and inputs the resistance change of the thermistor 10 due to temperature and the flame current change of the flame sensor 21 due to burnup. The temperature of the heater 8 is controlled to each set temperature.

The operation of the present invention constructed as described above will be explained with reference to the time chart shown in FIG.

First, the heater 8 is energized by the operation to start the combustion operation, and the vaporizer 5 is heated to the vaporization temperature of the liquid fuel (e.g.
300°C), it is detected by the thermistor 10, and in response to this detection, the electromagnetic pump 4 is driven, the solenoid 15 is energized, the needle shaft 14 is retracted, the spout 13 is opened, and the control Means 24 control triax 22 to keep this vaporization temperature constant. By driving this electromagnetic pump 4, the liquid fuel in the oil receiving tray 1 is sequentially supplied into the vaporizing filter section 9 through the oil supply pipe 3, and is sequentially vaporized by the heat of the vaporizer 5 to become vaporized gas. Nozzle 11 via 12
The mixing pipe 18 of the burner 17 flows from the spout 13 opened in advance via the solenoid 15 to the inside of the burner 17.
It is squirted inside. At this time, due to the jet effect accompanying the injection, primary air is sucked into the mixing tube 18 along with the vaporized gas, and these two are mixed to form a mixture, which is diffused into the diffusion section 19 and uniformly ejected from the gas injection section 20. , and is further supplied with secondary air for combustion.

Here, due to long-term use of liquid fuel containing a small amount of heavy content or misuse of degraded liquid fuel, impurities such as tar gradually accumulate in the vaporization filter section 9, and as a result, vaporized gas flows to the nozzle 11. supply will gradually decrease. When the vaporized gas is no longer sufficiently supplied, the flame of the burner 17 becomes smaller, and the flame current value detected by the flame sensor 21 gradually decreases from the normal value of, for example, 30 μA. When this current value decreases to a predetermined current value (for example, 20 μA), the control means 24 controls the triax 22 to shorten the energization cycle of the heater 8 to lower the temperature of the vaporizer 5, as shown in FIG. The inside of the vaporizer 5 is cleaned by raising the temperature for a certain period of time to a high temperature (for example, about 380° C.) at which tar etc. can be thermally decomposed. Due to this cleaning during combustion, the vaporization filter section 9
Impurities such as tar adhering to the vaporizer 5 are thermally decomposed and vaporized or softened, and are ejected from the nozzle 11 and burned together with the vaporized gas, reducing the generation of irritating odors due to cleaning. can be cleaned. Also,
This cleaning will reduce the flame current value to its normal value.
When it returns to 30 μA, the control means 24 again lowers the temperature detected by the thermistor 10 to the vaporization temperature to continue normal combustion. If the flame current value does not rise to the normal value even after the vaporizer 5 is raised to a high temperature T for a certain period of time, it is assumed that there is an abnormality and the heater is turned off as shown by the dotted line in FIG. 8,
Power to the solenoid 15 and the electromagnetic pump 4 is stopped, and combustion is stopped.

In this way, by cleaning the vaporizer 5 at a high temperature while burning, vaporized or softened tar and the like are burned together with the vaporized gas, so cleaning can be carried out indoors with less irritating odor. In addition, the flame sensor 21 detects a decrease in the flame current value due to the accumulation of tar etc. in the vaporizer filter section 9, and automatically increases the temperature of the vaporizer 5 to perform cleaning, which eliminates the troublesome conventional method. Dry cleaning work and vaporization filter section 9
No need to replace.

Although one embodiment of the present invention has been described above in detail, it can be modified as appropriate within the scope of the gist of the present invention. for example,
The vaporization temperature, the thermal decomposition temperature of tar, and the flame current value for starting cleaning can be set as appropriate. Further, the cleaning may not be continued for a certain period of time T, but the cleaning may be canceled when the flame current value returns to the normal value, and the combustion may be shifted to normal combustion.

[Effect of idea]

As detailed above, according to the present invention, by cleaning the vaporizer while burning, it is possible to provide a vaporizing combustion appliance that generates less irritating odor and can automatically and easily clean the vaporizer.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the present invention;
FIG. 2 is a heater control circuit diagram, and FIG. 3 is a time chart. 5... Carburizer, 8... Heater, 17... Burner, 21... Flame sensor, 24... Control means.

Claims (1)

[Scope of utility model registration request] In a vaporization type combustion appliance that supplies liquid fuel to a vaporizer equipped with a heater, vaporizes the liquid fuel in the vaporizer, and guides the vaporized gas to a burner to burn it, a flame current is generated according to the burnup degree in the burner. A flame sensor detects the flame, and when the flame current detected by the flame sensor falls below a predetermined level, the temperature of the vaporizer is reduced to a temperature at which impurities such as tar adhering to the vaporizer can be thermally decomposed while burning. A vaporizing combustion appliance characterized by comprising: control means for controlling the heater to raise the temperature for a certain period of time.