JPH0330695Y2 - - 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 target, the electromagnetic pump is driven, and the liquid fuel 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 vaporization filter section until the tar is burned off will generate gas from the vaporized tar, which has a strong pungent odor, making it difficult to carry out indoor cleaning. There is a problem that the burning 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 idea]

(Means for solving the problem) The present invention provides a temperature detection sensor 11 near the liquid fuel supply port 6 of the vaporizer 5, and vaporizes impurities such as tar attached to the vaporizer 5 to a temperature at which it can be thermally decomposed. A control means 24 for controlling the heater 8 to raise the temperature of the vessel 5 is provided.

(Function) When the temperature detected by the temperature detection sensor 11 rises above a predetermined level, the control means 24 controls the heater 8 while burning to raise the temperature of the carburetor 5 to a predetermined temperature for a certain period of time. Cleaning is performed by thermally decomposing impurities adhering to 5.

(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 pan 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 first thermistor provided in the vicinity of the nozzle in the base body 7, and is used to detect the temperature of the vaporizer 5 and set the vaporization temperature and cleaning temperature of the vaporizer 5. Reference numeral 11 denotes a second thermistor for abnormality detection provided near the fuel supply port 6 in the vaporization filter section 9, which detects the temperature inside the vaporization filter section 9 near the fuel supply port 6, and detects when the vaporization filter section 9 is abnormal. Detects high temperatures. Reference numeral 12 denotes a nozzle that communicates with the vaporization filter section 9 via a communication pipe 13, and causes the vaporized gas sent from the vaporization filter section 9 to be ejected from the ejection port 14. Reference numeral 15 denotes a needle shaft which is provided so as to be able to move forward and backward within the nozzle 12 by a solenoid 16 so as to open and close the jet nozzle 14. During combustion, the jet nozzle 14 is opened and during non-combustion, the jet nozzle 14 is closed. The spout 14 is cleaned by this. Reference numeral 17 denotes a fuel return pipe, one end of which is connected to the solenoid 16 and the other end opened to the oil receiving tray 1.

18 is a flat burner arranged on the front side of the vaporizer 5, and a cylindrical mixing pipe 19 and this mixing pipe 1
A horizontally long diffusion section 20 that extends from one end of the diffusion section 9 at a right angle and expands toward the bottom, and a gas blowout section that is formed by a large number of slits formed in the upper surface of this diffusion section 20. It consists of 21.
The opening end face of the mixing tube 19 is spaced apart from and facing the jet nozzle 14 of the nozzle 12, and the vaporized gas jetted from the jet nozzle 14 and the primary air drawn from the opening end face are mixed and sent to the gas blowing part 21. Sent.

FIG. 2 shows a control circuit for the heater 8, and this embodiment uses a zero-cross method in which a current 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. Then, the thermistor 1 is connected to the first thermistor 10 and the second thermistor 11 according to the temperature.
A control means 24 inputting resistance changes of 0 and 11 is connected to the gate terminal of the triac 22, and controls conduction of the triac 22 to control the temperature of the heater 8 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℃), the first thermistor 1
0 is detected, and in response to this detection, the electromagnetic pump 4 is driven, the solenoid 16 is energized, the needle shaft 15 is retracted, and the spout 14 is opened, and the control means 24 maintains this vaporization temperature constant. Controls the triator 22. By driving this electromagnetic pump 4, the liquid fuel in the oil pan 1 is sequentially supplied into the vaporization filter section 9 through the oil supply pipe 3, and is sequentially vaporized by the heat of the vaporizer 5 to become vaporized gas, and this vaporized gas is transferred to the communication pipe. Nozzle 1 via 13
2, and the mixing pipe 1 of the burner 18 is
It is squirted inside 9. At this time, due to the jet effect accompanying the injection, primary air is sucked into the mixing tube 19 together with the vaporized gas, and both of them are mixed to form a mixture, which is diffused into the diffusion section 20 and released into the gas ejection section 21.
It is ejected uniformly from the air, and is further combusted with the supply of secondary air.

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. The fuel path becomes narrower and the amount of fuel passing through is reduced. However, the control means 24 controls the nozzle 12 based on the temperature detected by the first thermistor 10.
Since the temperature of the vaporizing filter section 9 near the fuel supply port 6 is kept almost constant at the vaporization temperature, the temperature of the vaporized gas supplied to the nozzle 12 hardly changes, but the temperature of the vaporizing filter section 9 near the fuel supply port 6 is kept constant at the vaporization temperature. tube 3
As the amount of cold liquid fuel passing through the temperature decreases, the cooling effect becomes weaker and the temperature rises compared to normal conditions (e.g. 280 degrees Celsius). Then, the temperature detected by the second thermistor 11 is a predetermined temperature (for example, 320°C).
When the control means 24 rises to 2, the control means 24
2, the energization cycle of the heater 8 is shortened as shown in Fig. 3, and the temperature of the vaporizer 5 is raised for a certain period of time T to a high temperature (e.g. 380°C) at which impurities such as tar can be thermally decomposed. Clean the filter section 9. Due to this cleaning during combustion, tar etc. adhering to the vaporization filter section 9 are thermally decomposed and vaporized or softened, and are ejected from the nozzle 12 together with the vaporized gas and burned, so that the generation of irritating odors due to cleaning is reduced. Cleaning can be done indoors while burning. After a certain period of time T has passed, the temperature of the vaporizer 5 is lowered to the vaporization temperature again, and then the second thermistor 11
If the temperature detected by is lowered to the normal temperature, normal combustion is continued. Note that if the temperature detected by the second thermistor 11 does not drop to the normal temperature even after a certain period of time T has elapsed and the temperature of the vaporizer 5 has returned to the vaporizing temperature, it is considered abnormal, as shown by the dotted line in FIG. energization to the heater 8, solenoid 15, and electromagnetic pump 4 is stopped, and combustion is stopped.

In this way, by cleaning the vaporizing filter section 9 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 second thermistor 11 for abnormality detection detects a temperature rise in the vaporization filter section 9 near the fuel supply port 6 due to the accumulation of impurities such as tar in the vaporization filter section 9, and automatically closes the vaporization filter section 9. Since cleaning is performed by raising the temperature, the conventional complicated dry firing cleaning work and replacing work of the evaporation filter section 9 are no longer necessary.

Although one embodiment of the present invention has been described in detail above, it can be modified as appropriate within the scope of the gist of the present invention. For example, the vaporization temperature and thermal decomposition temperature of tar by the first thermistor 10 and the cleaning start temperature by the second thermistor 11 can be set as appropriate.

[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 drawings]

FIG. 1 is a partially enlarged schematic 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, 11... Second thermistor (temperature detection sensor), 18... Burner,
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 for combustion, the vaporizer is provided near the liquid fuel supply port of the vaporizer. and a temperature detection sensor that controls temperature detection, and when the temperature detected by this temperature detection sensor rises above a predetermined level, the temperature of the vaporizer is kept constant while burning to a temperature at which impurities such as tar attached to the vaporizer can be thermally decomposed. and control means for controlling the heater to increase the time.