JPH0420710A - Operation control device for pot burner - Google Patents

Abstract

PURPOSE:To remove the tar at the bottom section of a burner at the time of fire extinguishing and maintain stable combustion conditions for a long term by providing a control section which controls a fuel supply means through a drive means so as to stop fuel supply and extinguish fire after continuing combustion for a certain time with the fuel supply quantity for the minimum combustion quantity. CONSTITUTION:A control section 10 sets the combustion mode in strong, medium, and weak combustion modes according to the difference between the room temperature that is set by a room temperature setting means and the room temperature detected by a room temperature sensor and controls the quantity of fuel supply for a fuel pump 3 through a driver 11. When ordinary fire extinguishing operation is made by an operation switch 12, the combustion is continued for a certain time (five minutes) with the fuel pump 3 at the minimum combustion quantity (weak combustion mode) through the driver 11 regardless of the preceding combustion quantities, and the temperature of the bottom section 1-c of the burner can be raised and the tar can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pot burner operation control device that improves the method of stopping the supply of liquid fuel when extinguishing a fire.

Conventional technology The conventional general pot burner operation control device.

It has a fuel supply means and a combustion blower, and during normal operation, it supplies liquid fuel such as kerosene and air into the pot burner. The amount of fuel supplied was controlled in several stages from maximum to minimum, the room temperature was kept constant, and when extinguishing a fire, the fuel supply was stopped to extinguish the fire.

(For example, Japanese Utility Model Application Publication No. 60-2155) There are also systems that detect abnormal conditions such as earthquakes and overheating and immediately extinguish the fire.

(For example, Japanese Unexamined Patent Publication No. 151828/1982, Japanese Utility Model Application No. 61
-18462 Publication) Problems to be Solved by the Invention According to the above configuration, even if the operation is continued at the maximum combustion rate when used semi-outdoors such as in a single store in a cold region, or in a large room with a large heat load, the room temperature remains the same. There are cases where the fuel is operated continuously at the maximum combustion rate without reaching room temperature.

In a pot burner that partially supplies liquid fuel to the bottom of the burner, when the combustion rate is at its maximum, the latent heat of vaporization due to the supplied fuel becomes large, and the temperature of the bottom of the burner near the fuel supply point becomes relatively low, causing tar to form in this area. There was a problem in that it was easy to accumulate and cause poor combustion.

If we design a pot burner with a high temperature at the bottom of the burner to prevent the formation and accumulation of tar.

When the fuel supply amount is /JX, there is a problem that the heat radiation due to the latent heat of vaporization of the supplied fuel decreases, the temperature at the bottom of the burner increases too much, and the material life is shortened.

Means for Solving the Problems The present invention has been made in order to solve the above problems, and during normal driving operation input, after continuing combustion with the fuel supply amount set to the minimum combustion amount for a certain period of time, the fuel supply is stopped. The fuel supply means is controlled via the drive means to stop and extinguish the fire, and the fuel supply is immediately stopped when an abnormality such as activation of a seismic sensor or overheating prevention switch is detected.

Effect By configuring as described above, the maximum combustion state continues during normal operation, and even when used in conditions where tar is likely to be generated and deposited near the fuel supply point, the combustion state is forcibly maintained at a constant level when normal operation is stopped. It maintains the combustion state for a minimum time, raises the temperature at the bottom of the burner, and removes the tar that has formed and accumulated.

It also works to quickly extinguish the fire in the event of an earthquake or abnormal conditions such as overheating.

Example An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a schematic diagram of the configuration of the pot burner of this embodiment, Fig. 2 is a block circuit diagram of the operation control device of the pot burner, and Fig. 3 is a block diagram of the operation control device of the pot burner.
The figure is part of the control flowchart.

In Fig. 1, reference numeral 1 denotes a pot burner, and the side wall has a large number of primary air holes 1-b and secondary air holes 1-a perforated in the circumferential direction, and the bottom has a fuel nozzle 2 and an ignition heater. 4, and a deflector 6 is provided on the inside corresponding to the secondary air hole 1-a portion. One end of the fuel nozzle 2 is connected to a fuel pump 3 which is a fuel supply means, and the other end is opened near the center of the burner bottom 1-c. A burner base 5 covers the pot burner 1 and functions to guide air sent from the combustion blower 7 to the pot burner 1.

In FIG. 2, a microcomputer 10 that is a control unit includes a driver 11 that is a driving means for driving a fuel pump 3, a combustion blower 7, and a convection blower I4, an operation switch 12 that is an operation operation unit, a vibration sensor 8, and An overheat prevention switch 9 is connected.

The operation of this embodiment having the above configuration will be explained.

When the operation switch 12 is operated, the ignition heater 4 is energized, the combustion blower 7 is operated via the driver 11, and the combustion air A flows into the burner base 5 and the primary air hole 1- It is supplied to the inside of the pot burner 1 through the secondary air holes 1-a and 1-a. After preheating the pot burner 1 for a certain period of time with the ignition heater 4, the fuel pump 3 is operated by the driver 11, and liquid fuel (kerosene in this example) B is
is dripped onto the burner bottom 1-c through the fuel nozzle 2, heated by the ignition heater 4, evaporated, and ignited by the red-hot ignition heater 4. After ignition, the burner bottom 1-c is heated by the flame, the amount of evaporation increases, it mixes with the primary air, and a flame is formed in the secondary air hole 1-a, resulting in a steady combustion state.

The deflector 6 is heated red by the flame and supplies the heat required for evaporation of kerosene at the burner bottom 1-c by heat radiation, and the ignition heater 4 is de-energized after ignition.

In the steady combustion state, the control unit 10 sets the combustion mode to strong, medium, or weak depending on the difference between the room temperature set by the room temperature setting means (not shown) and the room temperature detected by the room temperature detection means (not shown).
The fuel supply amount of the fuel pump 3 is controlled via the driver 11.

As shown in Fig. 3, when a normal fire extinguishing operation is performed using the operation switch 12, the fuel pump 3 is set to the minimum combustion amount (
By continuing combustion for a certain period of time (5 minutes in this example) in a weak combustion mode, the temperature of the burner bottom 1-C can be raised and tar can be removed.

Note that when the seismic sensor 8 is activated or when the overheating prevention switch 9 is stopped due to abnormal operation, combustion is not performed at the minimum combustion amount, and the fuel pump 3 is immediately stopped and the operation is stopped.

Effects of the Invention As described above, according to the present invention, when normally extinguishing, combustion is continued at a minimum combustion amount for a certain period of time and then extinguished, so that the maximum combustion state continues continuously and tar is generated at the bottom of the burner. Even under conditions where tar builds up, it is possible to remove tar from the bottom of the burner when extinguishing the fire, thereby providing a pot burner that can maintain stable combustion over a long period of time.

In addition, it is no longer necessary to design the burner bottom to have a high temperature during steady state to prevent tar formation and accumulation in the maximum combustion state, and the heat-resistant life of the burner bottom can be extended.

Furthermore, since combustion is immediately stopped when an abnormality occurs, the same safety as in the past can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the configuration of a pot burner showing an embodiment of the present invention, FIG. 2 is a block circuit diagram of an operation control device for the pot burner, and FIG. 3 is a diagram showing a part of its control flowchart. 1... Pot burner, 3... Fuel supply means (fuel pump), 8... Earthquake sensor, 9... Overheat prevention switch,
10...Control unit (microcomputer), 11...Driving means (
Driver), 12...Driving operation unit (driving switch)
. Applicant: Hitachi Home Chick Co., Ltd.

Claims (1)

[Claims] 1. A fuel supply means (3) for supplying liquid fuel to the bottom (1-c) of a bottomed cylindrical pot burner (1) having a number of air holes on the side surface; (3), a drive means (11) such as a blower, and a control section (10).
10) to connect the operation control unit to the fuel supply means (
3) In a pot burner operation control device that controls the output in several stages from the maximum combustion amount to the minimum combustion amount, the control section (1
0) is when normal operation stop is input from the operation unit (12),
After continuing combustion with the fuel supply amount as the minimum combustion amount for a certain period of time, the drive means (11
1. An operation control device for a pot burner, characterized in that the fuel supply means (3) is controlled through the fuel supply means (3). 2. Connect the seismic sensor (8) and overheating prevention switch (9) to the control unit (10), and connect the seismic sensor (8) and overheating prevention switch (
When an abnormality is detected, such as when any of 9) is activated, the fuel supply is immediately stopped, and combustion continues for a certain period of time with the fuel supply amount being the minimum combustion amount only when normal operation is stopped by the operation control unit (12). 2. The pot burner operation control device according to claim 1, wherein the pot burner operation control device is configured to stop the fuel supply and extinguish the fire after the fire is extinguished.