JPS643968Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pot burner in which a burner pot is equipped with an electric ignition heater and fuel is supplied to the burner pot after waiting for the temperature of the heater to rise.

Conventionally, a type is known in which a detector detects the temperature of the outer wall of a pot burner, detects that the burner pot has been heated to a predetermined temperature, and supplies fuel to the burner pot. However, even if the burner pot is not sufficiently heated by the preheater, the fuel can be ignited if the ignition heater is heated to the ignition temperature. However, the ignition heater is generally installed inside the pot burner, while it is not preferable to install the temperature sensor inside the burner pot where it will be exposed to flames, so it is installed on the outside of the burner pot to detect the rise in temperature of the burner and ignite it. A rise in heater temperature is detected. For this reason, even though the temperature of the ignition heater has risen sufficiently, there is a delay in the temperature detection operation by the detector, and it takes a long time to reach ignition, which is an inconvenience, especially in cold regions. This tendency is remarkable.

The object of the present invention is to eliminate such inconveniences and to obtain a pot burner which can sustain combustion only when the burner pot is maintained at a certain temperature or higher according to the temperature sensor. Equipped with an electric ignition heater 2 inside,
In the type that supplies fuel to the burner pot 1 after waiting for the temperature of the heater 2 to rise, the heater 2 is configured to heat not only the part facing into the burner pot 1 but also the part protruding to the outside. The heater 2 is supported by a heat conductive holder 3 fixed to the outer wall of the burner pot 1, and the temperature detector 4 is supported by the holder 3.

What is shown in the figure is a grip part 3b that supports the holding plate 3 on the burner pot 1 on the tongue piece 3a facing the lower surface of the burner pot 1, and that grips the heater 2 and the temperature sensor 4 at the root of the tongue piece 3a. ,3c
are provided close to each other, and the base of the ignition heater 2 and the temperature sensor 4 are gripped by this, and the tip of the heater 2 is made to face into the burner pot 1. In this case, the heater 2 is, for example, a ceramic heater, and is configured to have a heat generating part not only at the tip but also at the root.

The illustrated embodiment shows a vaporizing burner 5 used as a bath burner, in which the burner pot 1 is used as a heating source and pilot heater for the vaporizer 7 of the vaporizer burner 6. 8 provides ventilation to the burner pot 1 and a vaporizing burner 6.
9 is a pump for supplying fuel to the burner pot 1 and the carburetor burner 6; 10 and 11 are fuel supply lines connecting the vaporizer burner 6 and the burner pot 1 to the pump 9; The interposed solenoid valve is shown.

The combustion of this embodiment will be explained below with reference to the control circuit shown in FIG. First, when the combustion control circuit is connected to the power supply, an output is generated in the comparator CP ₁ , and the comparator
A voltage is applied to the base of the transistor TR ₁ connected to the output terminal of CP ₁ , and the transistor TR ₁ is kept in the operating state, and at the same time, charging of the capacitor C ₁ connected to the input side terminal of the comparator CP ₁ starts. .

Note that the comparator CP ₁ is set so that its output will not be inverted even if the capacitor C ₁ is charged.

Next, press the ignition switch TS, the thyristor
A voltage is applied to the gate of the SCR, and the thyristor SCR
is ON, safety switch SW ₁ , fire extinguishing switch
SW ₂ , thyristor SCR and the transistor
Energize relay R ₂ via TR ₁ . The relay R ₂
The respective relay contacts R ₂ −1a, R ₂ −2a,
Close R ₂ −3a. According to this, the ignition heater 2
As the tip of the ignition heater 2 is heated, the temperature of the root of the ignition heater 2 also rises. Then, a thermo switch with a built-in bimetal thermometer as temperature detector 4
TH ₁ closes, which activates the electromagnetic pump P.
Solenoid valve interposed in the fuel supply path of burner pot 1
The coil of VS ₁ is excited and opened, and the motor M of the blower 8 is driven to rotate. Therefore, fuel is supplied to the burner pot 1 and combustion begins, and the vaporizer 7 of the vaporizer burner 6 is heated with the fuel.

Then, when the vaporizer 7 is heated to the predetermined temperature, a thermoswitch is activated by detecting the temperature of the vaporizer 7.
TH ₂ is closed, which energizes the relay R ₁ and connects the b contact _{R 1} of the relay R 1 to the ignition heater 2.
-b is opened, so that the current to the ignition heater 2 is cut off. However, at this time, the bottom of the burner pot 1 is sufficiently heated and the heat is transferred to the temperature sensor 4 via the holder 3, so the thermo switch TH ₁ containing the temperature sensor 4 is closed. The burner pot 1 continues to burn in the burner pot 1, which thereafter functions as a pilot flame.

When the boil-up timer TM is set to a predetermined time, the self-holding contact TS closes and the transistor _TR2 as a switching element is activated.
At the same time as the relay R ₃ connected to this is connected to the power supply, a voltage is applied to the base of the transistor TR ₃ , and the capacitor C ₁ starts discharging through the resistor.

As a result, the coil VS ₂ of the solenoid valve 11 is energized and opened, so that fuel is supplied to the carburetor 7, the fuel is vaporized in the carburetor 7, and is supplied to the vaporization burner 6 along with air supply, and the fuel is supplied to the vaporization burner 6. Combustion begins at 6.

When the vaporizing burner 6 ignites, a rectifier circuit is formed between the flame detection rod F and the ground, and the second capacitor _C2 begins to be charged. Simultaneously with the completion of charging capacitor _C2 , the gate of the field effect transistor FET reaches the pinch-off potential, and the transistor
The source and drain of the FET are conductive, and the capacitor
discharge the charge stored in C ₃ and then comparator CP ₂
get the output.

As a result, a voltage is applied to the base of the transistor _TR1 to maintain a conductive state between the emitter and the collector of the transistor _TR1 . and said comparator CP ₁
loses the output from the output terminal at the same time as capacitor CP ₁ completes discharging.

As a result, the emitter and collector of the transistor _TR1 are maintained in a conductive state by the output from the output terminal of the comparator _CP2 .

However, if a misfire occurs for some reason and there is no continuity between the flame rod F and the ground, the signal applied to the gate of the field effect transistor FET will be lost, and the comparator _CP2 will be inverted and its output signal will be _lost . There is no conduction between the emitter and collector. This demagnetizes relay R ₂ and its contacts
Since R ₂ -1a, R ₂ -2a, and R ₂ -3a are opened, the supply of fuel to both burners 1 and 6 is immediately stopped.
In this way, according to the present invention, the electric ignition heater is configured to heat not only the part facing into the burner pot 1 but also the part protruding to the outside, and the heater 2 is fixed to the outer wall of the burner pot 1. Since the temperature sensor 4 is supported by the holder 3 having good thermal conductivity and the temperature sensor 4 is supported by the holder, the temperature sensor 4 is heated by the heat of the heater 2 transmitted through the holder 3. Compared to the type that detects the heating of the pot burner on the outside of the pot burner, the detection is faster and eliminates the inconvenience of taking a long time to reach normal combustion as seen in conventional examples. The heat of the burner pot 1 is transmitted to the temperature detector 4 via the holder 3, thereby keeping the temperature detector 4 in an operating state, thereby making it possible to continue combustion even after the preheater 2 is extinguished. It is not necessary to maintain combustion continuity separately, and the structure is simplified.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a perspective view, FIG. 2 is an enlarged cross-sectional view of the main part, FIG. The perspective view, FIG. 5, shows one example of the control circuit. 1...burner pot, 2...ignition heater, 3...
... Holder, 4... Temperature detector, 5... Combustion control circuit.

Claims (1)

[Scope of utility model registration request] In a burner pot 1 which is equipped with an electric ignition heater 2 and which supplies fuel to the burner pot 1 after waiting for the temperature of the heater 2 to rise, the heater 2 is installed not only in the part facing into the burner pot 1 but also in the burner pot 1. ,
The parts that protrude to the outside are also configured to be heated,
A pot burner in which the heater 2 is supported by a heat conductive holder 3 fixed to the outer wall of the burner pot 1, and a temperature detector 4 is supported by the holder 3.