JPH0420713A - Operation controller of pot burner - Google Patents

Abstract

PURPOSE:To prevent faulty combustion of the burner at the bottom and provide a delay control device which is capable of holding the state of combustion stably for a long term by making the state of maximum combustion continue and hold the minimum combustion state for a certain time when the measured time by a counter goes over a specified value regardless of set room temperature and detected room temperature. CONSTITUTION:When a fuel pump 3 continues a strong combustion condition in the maximum combustion quantity continuously, a counter 12 is renewed and the fuel pump 3 is forcibly in weak combustion mode with the minimum combustion quantity for 10 minutes, and after 10 minutes the counter 12 is reset and the combustion control mode returns to the mode with normal combustion quantity. And when the room temperature TR detected by a room temperature detection thermistor 9 is over a set temperature TS given by a room temperature setting means 8 and the combustion mode is shifted to medium combustion mode and to weak combustion mode, the counter 12 is reset and normal combustion control mode is continued, and the mode is forcibly shifted to weak combustion mode only when the strong combustion conditions are continued. As a result faulty combustion and an excessive rise of temperature at the bottom of the burner can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operation control device for a pot burner that performs heating by controlling the combustion amount of liquid fuel depending on the room temperature.

2. Description of the Related Art A conventional general pot burner operation control device has a fuel supply means and a combustion blower, and a part that supplies liquid fuel such as kerosene and air into the pot burner, and a part that supplies air to the pot burner at room temperature as shown in FIG. The fuel supply amount is changed from maximum (strong) to minimum (
It was designed to keep the room temperature constant by controlling the temperature in several stages up to
(For example, Japanese Utility Model Application Publication No. 60-2155) Problems to be Solved by the Invention In the conventional pot burner operation control device,
Even if you continue to operate at the maximum combustion rate when using the product outside of a store or other prison, or in a large room with a large heat load, the room temperature may not rise to the set room temperature and the unit may continue to operate at the maximum combustion rate. be.

In a pot burner where liquid fuel is partially supplied to the bottom of the burner, at maximum combustion rate, the temperature at the bottom of the burner near the fuel supply point is due to the large latent heat of vaporization due to the supplied fuel, and the temperature at the burner near the fuel supply point is There was a problem that tar was generated and deposited in this area, resulting in 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 amount of fuel supplied is small, the heat dissipation due to the latent heat of vaporization of the supplied fuel decreases, causing the temperature at the bottom of the burner to rise too much, resulting in a shortened material life.

Means for Solving the Problems The present invention has been made to solve the above problems, and includes a counter that measures the combustion time at the maximum combustion amount. When the time exceeds a predetermined value, the baking state is kept at 1111B for a fixed period of time regardless of the set room temperature or detected room temperature.

Effect By configuring as described above, when the detected room temperature does not reach the set room temperature and the combustion state is set to the maximum combustion amount, and tar starts to be generated and deposited, the combustion state is forcibly set to the minimum combustion amount, and the bottom of the burner The temperature rises, the generated and deposited tar is removed, and after a certain period of time, the normal operating state is reached with the amount of combustion determined from the set room temperature and the detected room temperature.

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 1-c 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. 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. 5 is a burner base that covers the pot burner 1, and the pot burner 1 receives air from the combustion blower 7.
act as a guide to

At the time of ignition, the ignition heater 4 is energized.

The combustion blower 7 is operated, and the combustion air A flows into the burner base 5, and the combustion air A flows into the primary air hole 1-b and the secondary air hole 1-b.
It is supplied into the pot burner 1 from a. After preheating for a certain period of time, the fuel pump 3 is operated, and the liquid fuel (kerosene in this example) is dripped into the burner bottom 1-c through the fuel nozzle 2, heated by the ignition heater 4, evaporated, and becomes red hot. Ignition heater 4 ignites 6 After ignition, the flame burns at the bottom 1 of the burner.
-c is heated, the amount of evaporation increases, and it mixes with the primary air 2
A flame is formed at the secondary air hole 1-a, and a steady combustion state is established. 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.
The ignition heater 4 is de-energized after ignition.

In FIG. 2, a microcomputer 10 that is a control unit includes a driver part 11 that is a driving means for driving a fuel pump 3, a combustion blower 7, and a convection blower 14, and a counter that measures the combustion time at the maximum combustion amount. 12 and a comparator 13 for comparing the high forces of the room temperature setting means 8 and the room temperature detection thermistor 9 which is the room temperature detection means.

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

As shown in FIG. 3, when the fuel pump 3 is continuously in a strong combustion state with the maximum combustion amount, the counter 12 is updated, and in this embodiment, when it reaches 4 hours, it is forced to 1.
For 0 minutes, the fuel pump 3 enters the weak combustion mode with the minimum combustion amount, the rear counter 12 is reset for 10 minutes, and the mode returns to the normal combustion amount control mode. Furthermore, even when the room temperature TR detected by the room temperature detection thermistor 9 exceeds the set temperature Ts by the room temperature setting means 8 and the combustion mode is shifted to medium or low, the counter 12 is reset and the normal combustion control mode is continued. The weak combustion mode occurs only when the strong combustion state continues continuously.

The optimum values of the time-up time and forced weak combustion time of the counter 12 are determined depending on the size of the pot burner, the amount of combustion, etc.

Effects of the Invention According to the present invention, when the maximum combustion state continues for a predetermined period of time, weak combustion is forcibly performed for a certain period of time. This has the effect of automatically preventing the formation and accumulation of tar, which would result in poor combustion, and maintaining stable combustion conditions for a long time.

In addition, it is no longer necessary to design a design that increases the temperature at the bottom of the burner during normal operation to prevent tar generation and accumulation in the maximum combustion state, and the heat-resistant life of the bottom of the burner can be extended. Since the forced weak combustion for this purpose occurs only after a long period of continuous maximum combustion, there is no significant loss in heating performance.

[Brief explanation of drawings]

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, Fig. 3 is a part of its control flowchart, and Fig.
The figure is a diagram showing a part of a control flowchart of a conventional pot burner operation control device. 1... Pot burner, 3... Fuel supply means (fuel pump). 7... Combustion blower, 8... Room temperature setting means, 9... Room temperature detection means (room temperature detection thermistor), 10.
...Control unit (microcomputer), 11...Driving means (driver), 12...Counter, 13...Comparator. Applicant: Hitachi Hometech Co., Ltd.

Claims (1)

[Claims] A fuel supply means (3) for supplying liquid fuel to the bottom (1-c) of a bottomed cylindrical pot burner (1) having many air holes on the side, and driving of the fuel supply means (3), a blower, etc. a room temperature setting means (8) having a control unit (10) for controlling operation, a room temperature setting unit (8) for setting a set room temperature (T_S) in the control unit (10), and a room temperature detection unit for detecting the room temperature (T_R). (9) and its set room temperature (T_S) and detected room temperature (
A comparator (T_R) that detects the difference (T_S-T_R) from
13) and check the difference between the set room temperature and the detected room temperature (T_S-
In the pot burner operation control means that controls the output of the fuel supply means (3) in several stages from the maximum combustion amount to the minimum combustion amount by the control unit ( 10), and if the maximum combustion state continues continuously and the time measured by the counter (12) exceeds a predetermined value, the set room temperature (T_S) by the room temperature setting means (8) or the room temperature detection means (9) Regardless of the detected room temperature (T_R), the fuel supply means (
3) A pot burner operation control device characterized in that it controls.