JPS6321417A - Stove - Google Patents

Abstract

PURPOSE:To make possible a normal ignition without a risk of backfire at the time of flame propagation from the main burner to the pilot burner by performing a control in which fuel is supplied to the main burner after replacing air in the pilot burner with fuel. CONSTITUTION:The fuel injected into a pilot flame mixing tube 12 draws air from surroundings and is mixed with the same. Since the pilot flame mixing tube has already been filled with air, the mixture becomes lean. Thereafter, however, it becomes the mixture of the drawn air and fuel, and so, the resultant fuel delivered from a pilot flame hole 13 shifts from the lean to normal condition. During the transient period, the fuel supply to the main burner 8 is suspended. By opening solenoid valves 18, 19, 20 after a set delay time and causing an ignition, the main flame is started and, at the same time, a pilot burner 11 is ignited by the main flame 14. As the pilot flame hole 13 is delivering the fuel mixed with the proper amount of air, it performs a normal burning, eliminating a risk of backfire into the pilot flame burner 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sub-control of combustion f when the stove is ignited, in a stove used at home.

2. Description of the Related Art A conventional stove of this kind is shown in FIG.
are connected, and a pilot fuel supply path 5 to the pilot nozzle /I/4 is branched between them. 6 is a thermocouple safety valve provided in the fuel supply path 2; 7 is a manual valve provided downstream of the thermocouple safety valve 6; 8 is a main burner; 8 is a main mixing pipe 9 corresponding to the main nozzle 3;
It is composed of a pilot flame mixing tube 12 and a pilot flame hole 13 corresponding to Lt4 (11Fi pilot burner and pilot flame nozzle), and the tip of each mixing tube is airtightly divided and integrally molded. There is. 14/ri is a main flame formed in the main flame hole 10, and 15 is a pilot flame formed in the pilot flame hole 13.

Problems to be Solved by the Invention In such a configuration, if the manual valve 7 is forcibly opened manually and the thermocouple safety valve 6 is also opened at the same time, the fuel supplied from the fuel supply path 2 will flow through the main nozzle 3 and the thermocouple safety valve 6. Pilot fire nozzle /I/
4 at almost the same time. Fuel is injected from the main nozzle 3 and the pilot nozzle /I/4 to the main mixing pipe 9 and the pilot mixing pipe 12 almost simultaneously. -Generally, the combustion gold of the pilot flame V'i100
kcal/h set after the song, main combustion loan f”1200
It is set around 0 kcal/h.

Also, when looking at the processing of the pilot fire mixture pipe 12, the pilot fire mixture pipe 1
2 cannot be processed very small. For example, when processing by casting, it is not possible to process a diameter of 8 mm or less, so
The minimum diameter of the mixing tube 12 is 8 mm. Also, main flame hole 10
The state of the gas ejected from the pilot flame hole 13 is such that the fuel is ejected after the air contained in each mixing tube is pushed out by the fuel. Therefore, the fuel ejected from each flame hole transitions from a lean state to a predetermined state. Considering the combustion amount, workability, and fuel condition as described above, compared to the time it takes for fuel (in the flammable range) to be jetted out from the main flame hole 10 after opening the manual valve 7, the amount of fuel (in the flammable range) that is jetted out from the pilot flame hole 13 is fuel (
In the flammable range), although the pilot flame combustion amount is small, since the volume of the pilot flame mixing tube 12 is large, it takes time to replace the air and fuel in the pilot flame mixing tube 12, resulting in a time delay. Due to this time delay, when the fuel ejected from the main flame hole 10 is ignited with an igniter (not shown) linked to the manual valve 7, combustion has started in the main flame hole 10, so the pilot flame Ignition to the hole 13 involves fuel being jetted out from the pilot flame hole 13.

Therefore, when the fuel ejected from the pilot flame hole 13 reaches the flammable range, it is ignited, but since the aforementioned fuel is diluted with air, the combustion speed is fast, and the pilot flame 15 is formed in the pilot flame hole 13. However, there was a problem of backfire. On the other hand, when the pilot flame hole 13 is ignited, the fuel jets out from the main flame hole 10 quickly, so that there is a problem that the main fuel is discharged from the main flame hole 10 at the time the pilot flame 15 is formed.

Means for solving the problem A burner section including a main burner and a pilot burner, a control section, a fuel control section, and a temperature sensor for detecting temperature are provided, and the control section, fuel control section, and temperature sensor are electrically connected. The control unit controls the fuel control unit, and after the start of fuel supply to the pilot burner, the control unit controls the fuel control unit to supply fuel to the main burner with a delay of several seconds to several tens of seconds. It is something that

According to the above-described configuration, the present invention supplies fuel to the pilot burner earlier than the main burner, and after replacing the air in the pilot burner with fuel, supplies the fuel to the main burner, and then supplies the fuel to the main burner. ignite. Therefore, when the flame transfers from the main flame of the main burner to the pilot burner, the fuel ejected from the pilot flame hole of the pilot burner is a predetermined premixture of air and fuel, and the fuel is in a lean state. has been resolved. Therefore, the pilot burner is ignited in a normal state and combustion continues without causing backfire.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Note that components having the same functions as those of the conventional device are given the same numbers and explanations thereof will be omitted.

In FIGS. 1 and 2, 16 is a microswitch linked to the manual valve 7, 17 is a fuel control section provided further downstream from the manual valve, and the fuel control section 17 includes the solenoid valve A1B, the solenoid valve 819, and the solenoid valve 819. It has a valve C20 and a solenoid valve D21, and the solenoid valve A18, the solenoid valve B19, and the solenoid valve C20 are arranged in parallel in the fuel supply circuit to the main nozzle 3, the solenoid valve B19 is connected to the orifice B22, and the solenoid valve C20 is connected to the orifice 023. have. The solenoid valve D21 is arranged in the pilot fuel supply path 5. Solenoid valve A18, solenoid valve B19, and solenoid valve C20 regulate the amount of fuel supplied to the main burner 8, and solenoid valve A18
is the maximum amount, and solenoid valve C20 determines the minimum amount. 24 is the top plate of the stove 1, 25 is a trivet placed on the top plate 24, and 26 is the main burner 8 and pilot burner 11 integrally molded in the center, which are pushed through and placed on the top plate 24. Soup saucer, 27
is an object to be heated placed on the trivet 25 and is heated by the high temperature exhaust gas 28 combusted by the main burner 8 and the pilot burner 11, 29 indicates the secondary air necessary for combustion, and 30 indicates the pilot flame hole. This is a thermocouple provided corresponding to No. 13. 31 is a temperature sensor that comes into contact with the object to be heated 27, and 32 is an operation panel for the drain opening 1, on which a main switch 33 and a temperature controller 34 are attached.

35 is a micro switch 16, a thermocouple 29, a temperature sensor''
! 17-30, receiving an electric signal from the operation panel 31, solenoid valve A18, solenoid valve B19, solenoid valve C20, solenoid valve D2
The drain port 1 is comprised of a control section 17 having a thermocouple safety valve 1, and a control section incorporating a control circuit for controlling electrical signals, a microcomputer, etc. therein in order to send electrical signals to the thermocouple safety valve 6.

In the above configuration, when the main switch 33 is turned on and the manual valve 7 is opened, the fuel supplied from the fuel supply path 2 flows through the fuel control section 17 and is passed through the main nozzle 3 and the pilot nozzle 4 to the main burner 8 and the pilot nozzle 4. A fire burner 11 is supplied to form a main flame 14 and a pilot flame 15 to start combustion, and at the same time heat the object 27 to be heated. At this time, when the main switch 33 is turned on and the temperature controller 34 is set to a desired temperature, for example 70°C, an electric signal is sent to the control unit 35 according to the flow of the electric signal.
At the same time as the manual valve 7 is operated, the micro switch 8 is connected, and the control unit 35 controls the solenoid valves A1B, B19,
It is sent to the solenoid valve C20 and the solenoid valve D21, and each solenoid valve becomes on (open) state.

The thermocouple 30 is heated by the pilot flame 15 and generates a thermoelectromotive force,
Sending an electric signal to the thermocouple safety valve 6 via the control unit 35,
The thermocouple safety valve 6 is mechanically connected to the manual valve 7, and when the manual valve 7 is operated, the forced open state is changed to an electrically open state (adsorption by an electromagnet). When it disappears due to wind etc., the electromotive force in the thermocouple 30 disappears and it becomes closed.

When used as described above, the temperature of the object to be heated 27 is detected by the temperature sensor 31 and the temperature of 70°C set in the temperature controller 34, and the temperature sensor 34 detects the temperature of 70°C.
In Figure 3, the horizontal axis shows time and the vertical axis shows the combustion state of the stove 1. The pilot burner 8 is extinguished and only the pilot burner 11 is burned, the main burner 8
, the extinguishment of both the pilot burner 11 and the extinguishment is indicated by a scale. The high heat changes to medium heat, low heat, etc. to achieve the specified purpose, and then
The use of ends. When used in this way, the solenoid valve D21 opens at the same time as the manual valve 7 is opened, and fuel is supplied from the pilot fuel supply path 5 to the ignition nozzle A/4 and into the pilot mixing pipe 12. Squirt fuel. This state is the pilot flame only state 36 shown in FIG. When the fuel Vi injected into the pilot flame mixing tube 12 enters the pilot flame mixing tube 12, air is sucked in from the surroundings and flows into the pilot flame mixing tube 12. Fuel and air mix in the pilot mixing tube 12, but since the pilot mixing tube 12 is filled with air in advance, the fuel in the pilot mixing tube 12 is filled with the sucked air. It mixes with air and becomes diluted,
After that, only the sucked air and fuel are mixed. Therefore, the fuel ejected from the pilot flame hole 13 transitions from a lean state to a predetermined state. During this period, fuel is not supplied to the main burner 8, and the solenoid valve A is supplied after a preset delay time.
1B, solenoid valve B19, and solenoid valve C20 are opened and the main burner 8 forms a main flame 14 and starts combustion by supplying electricity (this state is the high flame state 37 shown in FIG. 3) and igniting it. At the same time as starting, by igniting the pilot burner 11 with the main flame 14, fuel mixed with a predetermined amount of air is ejected from the pilot flame hole 13, so a pilot flame 15 is formed and normal combustion is performed. The aforementioned subordinate.

This has the effect of eliminating backfire of the pilot burner 11 during the next ignition.

Effects of the Invention The present invention provides a burner section having a main burner and a pilot burner;
A stove that has a control unit, a fuel control unit, and a temperature sensor that detects temperature.The control unit, fuel control unit, and temperature sensor are electrically connected, and the control unit controls the fuel control unit and controls the flow to the burner unit. After starting fuel supply to the pilot burner,
By performing control to start fuel supply to the main burner with a delay of several seconds to several tens of seconds, (1) the combustion state does not become a backfire state, preventing burnout of the burner, and also prolonging the life of the entire stove. Lengthen.

(2) Since the stove does not malfunction, the temperature sensor normally detects the temperature of the object to be heated, and it performs well in stewing and other cooking, allowing for comfortable cooking.

As mentioned above in the operation explanation, the conventional problems have been solved,
It provides a safe stove.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a stove according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the burner of the stove, Fig. 3 is a diagram showing the fuel supply state of the stove, and Fig. 4 is a diagram of the conventional stove. It is a sectional view of a stove. 1...Stove, 8...Main burner, 11...
... Pilot burner, 17 ... Fuel control section, 3
1...Temperature sensor, 35...Control unit. Name of agent: Patent attorney Hio Nakao and one other person I-
Ko〉口8-Main burner lI-Storage parna 17-ffi! Il+Miku St-1 Humidity sensor control unit Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] In a stove that has a burner section having a main burner and a pilot burner, a control section, a fuel control section, and a temperature sensor that detects temperature, the control section, the fuel control section, and the temperature sensor are electrically connected, A control function in which the control unit controls the fuel control unit to supply fuel to the burner unit and to the main burner with a delay of several seconds to several tens of seconds after the start of fuel supply to the pilot burner. A stove with a