JPH0455614A - Forced combustion device - Google Patents

Abstract

PURPOSE:To enable a soft ignition to be realized, enable a poor ignition or an explosion ignition to be prevented and further enable an explosion ignition to be avoided even if a certain amount of air is blown from a discharging port by a method wherein the number of revolution of a combustion fan 3 is gradually decreased during igniting operation. CONSTITUTION:A gas burner 2 for performing combustion is disposed in a combustion housing 1 and combustion air 30 for the gas burner 2 is supplied to a combustion housing 1 by a combustion fan 3. A combustion device is provided with a combustion control device 4 for controlling a supplying of gas of a specified amount to the gas burner 2, ignition at the gas burner 2 and a combustion fan 3. When an ignition is carried out, the number of revolution of the blower fan 3 is gradually decreased from the high number of revolution to the low number of revolution and further varied from an air rich state to a gas rich state. Accordingly, the flame is smoothly transferred without generating any explosion ignition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a forced combustion device equipped with a blower that supplies combustion air to a burner.

[Prior Art] For example, in forced combustion type gas appliances, flame transfer is generally poor, and if the exhaust path is long, the internal pressure in the combustion chamber becomes high and explosive ignition is likely to occur.

Therefore, when a proportional valve is interposed in the gas supply path to the gas burner, during ignition operation, the blower is rotated at a constant rotation speed, and only the proportional valve is controlled to gradually increase the gas supply amount. Forced combustion gas appliances that perform slow ignition are known.

In addition, a bypass passage equipped with a switching valve is installed in the gas supply path, and the switching valve reduces the gas supply amount, and the forced combustion type gas that performs slow ignition by lowering the rotation speed of the blower and igniting with low input. Equipment etc. are also known.

[Problems to be Solved by the Invention] However, in forced combustion devices, the exhaust port of the exhaust path is installed outdoors, so wind may enter through the exhaust port. Since the blower operates at a relatively low rotation speed during the ignition operation, even a slightly strong blow of wind can cause the exhaust port to become blocked, resulting in a problem where explosions and ignition are likely to occur during the ignition operation.

An object of the present invention is to provide a forced combustion device that is less affected by the wind that enters from the exhaust port of the exhaust path and that can easily perform slow ignition without significantly increasing costs.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a burner disposed within a combustion chamber to perform combustion, and a burner that rotates at a combustion rotation speed corresponding to the combustion amount during burner combustion, and a blower for supplying combustion air to the burner; and a fuel supply to the burner;
In a forced combustion device comprising a combustion control device that controls ignition of a burner and control of the blower, the combustion control device gradually reduces the rotation speed of the blower from a high rotation speed to a low rotation speed during an ignition operation, and controls the burner. A configuration was adopted in which the combustion rotation speed is set to the above-mentioned combustion speed at the time of ignition.

[Operation and effects of the invention] (Operation) During ignition operation, the combustion control device gradually reduces the rotation speed of the blower from high rotation speed to low rotation speed, and gradually changes from an air-rich state to a gas-rich state. Because of this, the fire spreads gently without causing an explosion or ignition.

(Effect) No explosion or ignition occurs even when using coal or petroleum-based gas.
Can perform slow ignition.

Even if the exhaust path is long, it can be safely ignited.

During ignition operation, the rotation speed of the blower is gradually reduced from high rotation speed to low rotation speed, and if there is strong wind blowing at the exhaust port, the ignition will ignite at high rotation speed, and if there is a weak wind or no wind blows. If so, the flame will transfer at low rotation speed.

This type of fire can be ignited without being affected by wind.

Furthermore, since bypass passages, switching valves, etc. are not required, the cost is low.

[Example] An embodiment of the present invention will be described based on FIGS. 1 to 3.

As shown in FIG. 3, the gas forced combustion bath device A, which serves as a forced combustion device, has a gas burner 2 that performs combustion arranged in a combustion housing 1, and a combustion fan 3 that moves the gas burner 2 into the combustion housing 1. Combustion air 30 is supplied. The scum forced combustion bath device A also includes a combustion control device 4 that controls the supply of a fixed amount of gas to the gas burner 2, the ignition of the gas burner 2, and the control of the combustion fan 3.

The combustion housing 1 has an inlet 1 for combustion air 30 at the bottom.
1 and an exhaust port 12 for discharging combustion exhaust gas to the outside. Further, a heat exchanger 13 is disposed above the gas burner 2 within the combustion housing 1.

The gas burner 2 includes a burner group 21 that forms a flame, and a nozzle pipe 23 that is located below the burner group 21 and has a spout 22 . Further, 13A gas g is supplied to this gas burner 2 through a gas supply pipe 20.

The combustion fan 3 includes turbo-type blades.

The combustion control device 4 includes a water flow switch 41 and a thermistor 4.
2. Original solenoid valve 43, governor 44 (for quantitative gas supply),
It consists of a main solenoid valve 45, an igniter 46, a frame rod 47, a pump 48, and an electronic unit 49 for excavating these.

Next, the operations of the four electronic units of the combustion control device 4 will be explained with reference to FIGS. 1 and 2.

(1) Turn on the additional firing operation switch (not shown).

(2) The pump 48 rotates and the hot water 51 in the bathtub (not shown)
is attracted.

(3) The water flow switch 41 is closed, and the combustion fan 3 rotates at a high rotation speed (3000 rpm) corresponding to the combustion rotation speed (position 31).

In addition, in the case of 6C gas, the rotation speed is high (2800 rotations/rotation position 34).

(4) Spark the igniter 46 and open the original solenoid valve 43 and main solenoid valve 45.

(5) After 3 seconds, the combustion fan 3 will rotate at a low rotation speed (2000
The rotation speed of the combustion fan 3 is gradually decreased so that the combustion fan 3 becomes approximately (rotations/minute) (position 132).

In addition, in the case of 6C gas, the rotation speed of the combustion fan 3 is gradually decreased so that after 3 seconds the combustion fan 3 reaches a low rotation speed (250 rotations/min) corresponding to the combustion rotation speed (position 35). ).

(6) When a flame is detected, the spark of the igniter 46 is stopped and the combustion fan 3 is returned to the combustion rotation speed (3000 rotations/minute) (position 33).

In the case of 6C gas, when a flame is detected, the spark of the igniter 46 is stopped and the combustion fan 3 is lowered to the combustion rotation speed (2500 rotations/minute) (position 36).

The effects of gas forced combustion bath device A will be described.

(a) By gradually reducing the rotation speed of the combustion fan 3 during ignition, an ignition operation similar to soft ignition can be achieved;
It can prevent ignition failure and explosive ignition, and even if some wind enters from the exhaust port, explosive ignition will not occur.

(B) Gas forced combustion bath device A only needs to be changed to control the rotation speed of the combustion fan 3 by the electronic unit 49.
does not significantly increase manufacturing costs.

In the above embodiment, a fixed amount of gas is supplied to the gas burner 2, but a proportional valve may be provided to vary the amount of gas during combustion.

Further, in the above embodiments, the fuel is gas-based, but it may be fueled with kerosene or the like.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the relationship between time and bath blower rotation speed when the gas is 13 A in a gas forced combustion bath device showing an embodiment of the present invention, and FIG.
This is a graph for case C. Figure 3 is the bath outfit! FIG.

Claims (1)

[Scope of Claims] 1) A burner arranged in a combustion chamber to perform combustion, and a blower that rotates at a combustion rotation speed corresponding to the amount of combustion during burner combustion and supplies combustion air for the burner to the combustion chamber; In a forced combustion device comprising a combustion control device that controls fuel supply to the burner, ignition of the burner, and control of the blower, the combustion control device changes the rotation speed of the blower from a high rotation speed to a low rotation speed during an ignition operation. A forced combustion device characterized in that the rotational speed is gradually decreased to the combustion rotational speed at the time of ignition of the burner.