JPH10110945A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an incomplete combustion caused by a difference in altitude by a method wherein there is provided a timer capable of changing a preliminary combustion time in response to an altitude in a combustion device for performing a preliminary combustion of low combustion power for a specified period of time and changing-over it to a full combustion after the preliminary combustion. SOLUTION: As an operation switch 17 is turned ON, an igniting means 2 starts an igniting operation, a combustion blower 6 starts air blowing to a combustion burner and concurrently a fuel supplying means 5 supplies kerosene for a low power combustion and the kerosene is ignited by the igniting means 2. Before performing this operation, a timer variable means 20 is selected in compliance with a flat land or an altitude and is veried. Then, the preliminary combustion is carried out only for a selected time and a temperature at the bottom part of the combustion burner is sufficiently increased by this preliminary combustion. That is, the preliminary combustion in each of 6 minutes for a feat land, 12 minutes for an altitude of 500 to 1000m and 15 minutes for an altitude of 1001 to 1500m does not cause oil to be accumulated even in a full combustion, resulting in that kerosene is positively evaporated for each of the altitudes and no incomplete combustion is caused,.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus such as a hot-air heater used in ordinary households for evaporating and burning fuel oil with a pot-type combustion burner.

[0002]

2. Description of the Related Art Conventionally, this type of heater has been used as a hot air heater or the like on flat ground or at high altitudes. The air becomes lean and the balance between fuel oil and combustion air is lost,
During the pre-combustion, the temperature of the combustion burner is not sufficiently increased, so that the fuel oil does not evaporate completely and becomes an oil pool in the combustion burner. It was something.

[0003] Generally, the oxygen concentration in the air is 10 altitudes.
It is said to decrease by 1% for every 0m rise, so a 500m elevation will reduce 5%, a 1000m elevation will decrease 10%, and a 1500m elevation will be 15%
Therefore, burning in the use of flat ground is very dangerous for safety.

For this reason, various improvements and improvements have conventionally been made. For example, a microcomputer or a sensor is used in accordance with altitude to increase the number of revolutions of a combustion blower to increase the amount of air, or to increase or decrease the amount of fuel and the amount of air. The correction is performed manually or automatically so as to maintain the balance between the amount of combustion air and the amount of fuel oil.

[0005]

However, the correction of the amount of combustion air and the amount of fuel by the conventional altitude measure is to form a complicated and highly accurate control circuit by combining a plurality of expensive detection sensors, and to provide a combustion burner. A vaporization system incorporating a heater is used, and conversely, the amount of combustion air and the amount of fuel are maintained in a delicate balance with a narrow allowable range. Cause.

[0006]

The present invention pays attention to this point, and solves the above-mentioned drawbacks.
In addition, a pot-type combustion burner with a large allowable range of the combustion air amount and fuel amount is used, and a timer function built in a commonly used microcomputer is used. In the combustion device, which comprises a blower and a fuel supply means for supplying fuel to the combustion burner, and performs a preliminary combustion with a small thermal power for a certain time and switches to the main combustion after the preliminary combustion, the preliminary combustion time is variable according to the altitude. This is provided with a timer variable means for performing the operation.

[0007]

When the operation switch 17 is turned on, the ignition means 2 starts the ignition operation, the combustion blower 6 starts blowing air to the combustion burner 1, and at the same time, the fuel supply means 5 supplies the fuel oil of the small combustion combustion to the ignition means. Fired at 2. When the operation switch 17 is in the OFF state or immediately after the operation switch 17 is turned on, the timer variable means 20 is adjusted to 20A / 20B /
Select and operate 20C to make it variable. Thus the timer starts counting variable has been T _1, T _2, T any time ₃ (6 minutes, 12 minutes, 15 minutes) to the preliminary combustion.

[0008]

FIG. 1 shows an embodiment of the combustion apparatus according to the present invention. Reference numeral 1 denotes a well-known pot-type combustion burner that evaporates and burns fuel oil at a concave bottom portion. An ignition means 2 such as an ignition heater is projected from a diagonally lower portion of a side wall toward an ignition core 3. It communicates with a fuel supply means 5 such as an electromagnetic pump having an oil supply port 4 below, an oil control or an electromagnetic valve.

Reference numeral 6 denotes a combustion blower for supplying combustion air from the outer periphery of the combustion burner 1 in a slightly excessive manner and for changing the rotation speed to a small heating power or a large heating power. Reference numeral 7 denotes a combustion chamber communicating above the combustion burner 1. Reference numeral 8 denotes one end connected to the combustion chamber 7, and the other end is a heat exchanger for hot air connected to the exhaust pipe 9. The heat exchanger is configured to have a surface area as large as possible to improve thermal efficiency. Reference numeral 10 denotes a blower for hot air, which is attached to the heat exchanger 8 from the rear of the casing 11 so that the wind exchanges heat with the heat exchanger 8 to become hot air and is discharged from a front outlet 12 to a required portion. . An operation unit 13 is provided on the front surface, which is exposed from the casing 11. 14 is a delay thermostat attached to the heat exchanger 8 or the outer wall of the combustion chamber 7.

Next, a main part block diagram of the electric circuit of FIG. 2 which is one embodiment according to the present invention will be described.
A control circuit 16 based on a microcomputer 15 having functions such as an operation and a timer is formed. Room temperature sensor 19 for detecting temperature
A timer variable means 20 which can vary the pre-combustion time from ignition to main combustion by altitude, and a heat exchanger 8
Or a delay thermostat 14 for detecting the temperature of the combustion chamber 7
Are connected.

Further, on the output side of the control circuit 16, the ignition means 2 such as an ignition heater which emits red heat by the ON signal of the operation switch 17 and stops the red heat by the ON signal of the delay thermostat 14 is provided.
Starts rotation by the ON signal of the operation switch 17, and turns off the delay thermostat 14 after the operation switch 17 is turned off.
The rotation of the combustion blower 6 stopped by the signal and the ON signal of the delay thermostat 14 is started, and the operation switch 17 is turned off.
The blower 10 for hot air which is stopped by the OFF signal of the post-F delay thermostat 14 and the fuel supply means 5 such as an electromagnetic pump which supplies or stops the supply of fuel oil by the ON-OFF signal of the operation switch 17 are connected.

A more specific relationship between the input side and the output side of the control circuit 16 will be described in more detail. The temperature setting means 18 is selectively operated according to the indoor temperature state before and after the start of combustion. The microcomputer 15 compares the difference between the detected temperature with the room temperature detected by the room temperature sensor 19 and calculates the fuel supply means 5, the blower 6 for combustion, and the blower 10 for warm air.
The circuit is configured to output small or large / medium / small and to reach the set temperature.

The timer variable means 20 includes a microcomputer 15
When the altitude of the place where the appliance body is used is 0 to 500 m on a flat ground, the timer function previously incorporated in the microcomputer 15 is automatically set to T without operating the first variable switch 20A. _If you set 6 minutes for ₁ hour, and the altitude is 501-1000m,
The second variable switch 20B is set to 12 minutes of T ₂ hours timer function is manually operated, and altitude 1001-150
For height of 0 m, the third variable switch 20C to set the manual operation for 15 minutes T ₃ hours at timer function, sufficiently even when the temperature of the combustion burner 1 bottom by experiment in advance is large thermal combustion The time during which the fuel oil evaporates and does not accumulate is set as the pre-combustion time for small thermal power.

The timer variable means 20 has an altitude of 150
In the case of 0 m or more, the pre-combustion time is not set because
At higher altitudes, normal combustion in this type of combustion device was limited as impossible. When the small thermal combustion by the preliminary combustion selected from T _{1 to} T ₃ is completed, the mode is switched to the main combustion set by the temperature setting means 18. The stop of the timer count by the timer variable means 20 is given priority over the control of the fuel supply means 5 controlled by the delay thermostat 17, the control of the combustion blower 16 and the control of the warm air blower 10.

Next, the operation of the embodiment of the present invention will be described with reference to the flowchart of FIG. When the operation switch 17 is turned on, the ignition means 2 starts an ignition operation, the combustion blower 6 starts blowing air to the combustion burner 1, and at the same time, the fuel supply means 5 supplies fuel oil of small combustion combustion and the ignition means 2 Ignite.

When the operation switch 17 is in the OFF state or immediately after the operation switch 17 is turned on, the timer variable means 20 is selected and operated according to the level ground or the altitude to change the timer. Thus the timer is one of T ₁ · T ₂ · T ₃ which is variable and starts counting time (6 minutes, 12
Min. 15 minutes) Pre-burn.

The pre-combustion causes the delay thermostat 14 to detect a predetermined temperature, and the timer stops counting to stop the ignition means 2 and the fuel supply means 5 to the large heating power set by the temperature setting means 18 or the set heating power. The appropriate amount of fuel is supplied, and the combustion blower 6 supplies combustion air for large heating power, and at the same time, the warm air blower 10 starts blowing and enters the main combustion. Thereafter, the temperature is controlled by the temperature setting means 18 and the room temperature sensor 19, and the fire is extinguished by turning off the operation switch 18.

In short, by preliminarily burning the selected T ₁ , T _2, and T ₃ hours by selectively varying the timer variable means 20 according to the altitude at which the appliance body is used, the bottom of the combustion burner 1 is reduced. The temperature is raised sufficiently. That is, 6 minutes of T ₁ when altitude is flat, and in the case of altitude 501～1000M 12 minutes of T _2, and altitude 1001~1500m
In the case of ( ₃ ), the temperature of the bottom of the combustion burner 1 is sufficiently raised by the preliminary combustion for 15 minutes at T3, and the oil does not accumulate even after the main combustion, so that the fuel oil is reliably evaporated at each elevation.
Even if the amount of combustion air and the amount of fuel oil are slightly unbalanced, they are within the allowable range of the pot-type combustion burner, so that incomplete combustion such as a large flame with oil smoke does not occur.

The T ₁ , T _2, and T ₃ hours are set by changing the program of the timer function of the microcomputer already incorporated in the main body of the apparatus, instead of controlling the bottom of the pot-type combustion burner 1 by attaching a detection sensor or the like. And can be realized at low cost.

[0020]

According to the present invention, the temperature can be sufficiently raised by the preliminary combustion of the pot-type combustion burner according to the altitude by selectively changing the timer variable means by the above-described configuration, and therefore, the main combustion involves oily smoke. As a result, incomplete combustion such as a large flame can be prevented. Further, it is not necessary to use a plurality of expensive detection sensors and a heater for preheating as in the prior art, and it is not necessary to construct a high-precision control circuit.

[Brief description of the drawings]

FIG. 1 is a sectional view of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of the electric circuit diagram.

FIG. 3 is a flowchart of the same.

FIG. 4 is an enlarged front view of the operation unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion burner 3 Blower for combustion 5 Fuel supply means 20 Timer variable means

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tokuji Kobayashi 7-7 Higashi Shinbo, Sanjo, Niigata Pref.

Claims (1)

[Claims] 1. A pot type combustion burner, comprising: a combustion blower; and fuel supply means for supplying fuel to the combustion burner.
In a combustion apparatus for performing a preliminary combustion with a small thermal power for a predetermined time and then switching to a main combustion after the preliminary combustion, a timer variable means for varying the preliminary combustion time according to the altitude is provided.