JPS5813915A - Burning device - Google Patents

Abstract

PURPOSE:To obtain preferable combustion characteristic of a burning device in all variable combustion quantity area by standing an intermediate cylinder having many air injection holes at the center of a combustion chamber and varying the number of opened holes in response to the alteration of fuel supply quantity. CONSTITUTION:Nozzles 1, 1' in which fuel is fed by an electromagnetic pump 2 are provided for high and low combustions, and solenoid valves 4, 4' are respectively interposed at fuel feed pipes 3, 3' respectively connected to the nozzles 1, 1'. An intermediate cylinder 11 having many air injection holes 16 at the outer periphery, in which combustion air is supplied by a blower including a fan 13 is stood at the center on the bottom of a combustion chamber 10, and an inner cylinder 17 for elevationally dividing the holes 16 at the cylinder 11 is stood on the inner surface of the cylinder 11. A port 18 communicating with a duct 15 under the cylinders 11, 17 is opened or closed by a damper 20 which is operated by a solenoid 19 electrically interlocked with the combustion quantity switching of solenoid valves 4, 4'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a combustion device that maintains the velocity of swirling combustion air constant regardless of the amount of fuel supplied and obtains good combustion characteristics.

In a conventional combustion device using a spray nozzle, a flame stabilizer 30 is installed in front of a nozzle 29 provided inside a blower tube 28, as shown in FIG. It is common to have a circular hole 31 and an air hole 32 on the outer periphery to create a negative pressure area on the flame stabilizer 3o to stabilize the flame. In order to prevent soot from adhering to the flame-holding part of 0 and to improve the combustion condition, a swirler 33 is usually formed. In this case, even if a mechanism that follows the variable amount of combustion air is used, the circular hole 31 on the flame stabilizer 30, the swirler 33
, the combustion air velocity of the air hole 32 on the outer periphery and the fuel injection velocity cannot be well balanced, causing a blow-off phenomenon and poor mixing, resulting in a large amount of soot, carbon oxide, etc. , has the disadvantage of incomplete combustion,
It had the disadvantage that good combustion characteristics could not be obtained in the entire range of variable combustion amount.

Also, in the combustion device shown in Fig. 4, even if the combustion amount is varied and the air amount is changed by changing the tap of the blower motor 12', the total area of the air jet holes 16' of the middle cylinder 11' will change. As a result, the swirling jet speed of the combustion air from each air jet hole 16' becomes weaker, resulting in poor mixing, making it impossible to form a blue flame, and causing soot.

- It had the disadvantage that carbon oxide was generated and good combustion characteristics could not be obtained in the entire range where the combustion amount was variable.

The present invention has been made to improve these drawbacks. In other words, when changing the amount of combustion air in parallel with switching the fuel supply, the combustion air injection speed should be kept almost constant in any combustion amount range, and under both low and high combustion conditions. Also, good combustion characteristics can be obtained.

The present invention will be explained below with reference to an embodiment shown in the drawings.

In Figures 1 and 2, 1 is a nozzle for high combustion, 1' is a nozzle for low combustion, and an oil tank (not shown) is used.
The fuel oil sent from the pump is passed through the electromagnetic pump 2, the oil pipes 3 and 3', and is sprayed from the tip of the nozzle 1.degree. 1'.

4.4' is a solenoid valve that electrically controls switching to nozzles 1 and 1' according to the amount of combustion.

The tip of the low combustion nozzle 1' and the tip of the igniter 6' are inserted into the opening 9 at the bottom of the can body 8, which is composed of the inner shell 7 and the outer shell 7', and the tip of the low combustion nozzle 1' and the ignition device 6' are attached to the lower part. The tips of the ignition devices 6 are provided so as to face the combustion chamber 1o. Reference numeral 11 denotes a middle cylinder erected in the bottom center of the combustion chamber 1o in communication with a wind cylinder 15 for supplying combustion air from a blower composed of a motor 12, a fan 13, and a fan case 14;
A large number of air ejection holes 16 are provided around the side wall of the air conditioner 1 .

Further; 6, an air jet hole 16 is provided on the inner surface of the middle cylinder 11.
An inner cylinder 17 that is divided vertically is installed vertically, and one inner cylinder 17 is installed vertically.
and a communication port 18 between the wind barrel 16 formed at the lower part of the middle cylinder 11
There is a solenoid 19 and a damper 20 that control the amount of air from the air jet hole 16 in the lower part of the middle cylinder 11 inside the inner cylinder 17, and that are electrically linked to the switching of the combustion amount by the solenoid valves 4 and 4'. .

21 is a position around the middle cylinder 11 that does not contact the inner cylinder 7
A cylindrical auxiliary combustion cylinder with an opening 22 in the □ to prevent particles ejected from the nozzles 1 and 1' from colliding with each other.
It is installed vertically at a position lower than 1 so as to form a mixing and vaporization chamber between it and the middle cylinder 11.

23 is a ring that controls the flow and pressure of combustion gas within the combustion chamber 10.

The operation of this embodiment will be explained below.

What differs from conventional methods is that the combustion air and fuel particles are supplied separately.

Fuel particles are sprayed from nozzles 1 and 1' by oil pressurized by an electromagnetic pump 2 through oil pipes 3 and 3'.
In order to vary the amount of combustion, there are nozzles 1.1' and 4.4' solenoid valves that cut off the spray in the middle of the oil pipes 3 and 3', respectively, so that the desired combustion can be achieved. Depending on the amount, the solenoid valves 4, 4' are turned ON-1''7J' to spray from one of the nozzles 1, 1' arranged above and below. Although the installed nozzle 1' is used for low fuel spray and the lower nozzle 1 is used for high fuel spray, both nozzles may be used for the same amount of spray.

On the other hand, combustion air is supplied into the middle cylinder 11 via the wind cylinder 16 by a blower composed of a motor 12, a fan 13, and a fan case 14, and is ejected from the air jet hole 16 of the middle cylinder 11 and swirls. The amount of combustion air can be varied in accordance with the amount of fuel supplied by providing a communication port 18 with the wind barrel 16 formed by an inner cylinder 17 that divides the air jet holes 16 in the vertical direction of the middle cylinder 11 into the inner surface of the middle cylinder 11. The passage to the air jet hole 16 is controlled by opening and closing the communication port 18 with a damper 20 by the action of the solenoid 19 which is interlocked with the operation of the two nozzles 1゜1' with different fuel supply amounts. The amount of combustion air can be varied depending on the situation.

In the combustion process, fine particles sprayed from the nozzles 1 and 1' pass through the opening 22 of the auxiliary combustion cylinder 21, mix with the high-speed swirling flow from the air jet hole 16 at the bottom of the middle cylinder 11, and are ignited by the ignition device 6. ignited. After ignition.

Instantly, the middle cylinder 11 and the auxiliary combustion cylinder 21 are mixed, the spray particles and the swirling air flow are mixed in the vaporization chamber, and the mixed particles are evaporated and vaporized by the radiant heat of the combustion flame, and the upper part of the middle cylinder 11 is mixed. Vaporization combustion takes place in the air jet holes 16 .

Next, the variable combustion process will be explained. In the case of spraying from the high combustion nozzle 1, the total air volume reaches the middle cylinder 11 with the communication port 18 open.
The air jet holes 16 eject the air and mix it with the high combustion amount spray under optimal conditions and at the specified air jet speed, maintaining a constant space, volume, and vaporization area necessary for high combustion conditions, and ensuring that evaporation, vaporization, and mixing are possible. Accelerated combustion. On the other hand, in the case of spraying from the low combustion nozzle 1', with the communication port 18 closed, the amount of air corresponding to low combustion is generated by the swirling air flow from the air jet hole 16 above the center of the middle cylinder 11, resulting in high combustion. Although the combustion amount was varied using a combustion device that uses the optimal space and volume for low combustion conditions with the same air velocity at the nozzle, combustion with gas fuel is also possible.

In this way, the present invention provides the following advantages when varying the combustion air amount in parallel with varying the combustion supply amount by switching a plurality of supply bodies.
It is possible to maintain the air ejection velocity at a substantially constant condition in any combustion amount range, and it is possible to provide a combustion device that has good combustion characteristics from low combustion to high combustion.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a combustion device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line B-B in FIG. 1, FIGS.
The figure is a sectional view of a conventional example. 1o... Combustion chamber, 11... Middle cylinder, 16
...Air blowout hole, 17...Inner cylinder. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
Figure 2 Figure 3 IjIJ

Claims (2)

[Claims] (1) Variable means for varying the amount of fuel supplied to the combustion chamber;
A middle cylinder is provided in the central part of the combustion chamber and has a large number of air injection holes in the side wall, and when the fuel amount is reduced by the variable means, some of the air injection holes in the longitudinal direction of the middle cylinder are provided. A combustion device characterized by being configured to stop blowing out air from the combustion device. (2) Claim 1, characterized in that an inner cylinder is disposed in the middle cylinder to stop the air from being ejected from the air ejection hole.
Combustion equipment as described in Section.