JPS5830493B2 - liquid fuel combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device that mixes liquid fuel such as kerosene with air and vaporizes the mixture.

The present invention will be described below with reference to an illustrated embodiment. In the figure, 1 is an air supply pipe, which has a nozzle part 2 with a small flow passage cross-sectional area at one end, and a forced air blower 3 connected to the other end. There is.

4 is an air flow adjustment valve installed in the middle of this air supply pipe;
Reference numeral 5 denotes an oil level regulator that communicates with a fuel tank (not shown) storing kerosene, etc. via a connecting pipe 6, and is constantly maintained by a float 8 equipped with a valve body 9 corresponding to the outflow lower part of the connecting pipe 6. Fuel is maintained from a certain reference plane A to a predetermined height k.

Reference numeral 10 denotes a through hole formed on the upper surface of the oil leveling device 5, 11 has an opening at one end connected to the bottom of the oil leveling device 5, and a supply port 12 at the other end passing through the side wall surface of the air supply pipe 1. This is a fuel supply pipe facing the nozzle part 2, and the height H of the supply port 12 of this supply pipe is set in advance so that it is slightly higher than the oil level height h of the oil level regulator 5, as shown in FIG. It is set.

Reference numeral 13 denotes a circular burner that is disposed on the nozzle portion 2 of the air supply pipe 1 and has a vaporizing chamber 14 formed inside. A heater 16 is buried corresponding to a surface 15.

Reference numerals 17 and 18 denote annular convex portions concentrically protruding from the bottom and ceiling of the vaporization chamber 14 in opposite directions, respectively.
A plurality of combustion ports 1 provided from the center of 4 to the outermost periphery thereof.
9 is formed into a complicated flow path 20 that is bent at multiple points.

A communication line 21 has one end located near the nozzle part 2 in the air supply pipe 1 and facing the forced air blower 3 side, and the other end communicates with the inside of the oil level regulator 5 through the through hole 10. tube,
22 is a bypass pipe in front of the nozzle part 2 that directs a part of the air to the outside without passing through the installation part of the supply port 12; This is an on-off valve that automatically opens and closes when the pressure reaches a certain value.

With the above configuration, the operation in this embodiment will be explained.

First, when the control valve 4 is opened and the forced air blower 3 is operated so that a predetermined amount of air is supplied to the air supply pipe 1, the supply port 12 of the fuel supply pipe 11 is located near the throat of the nozzle part 2. Because of this arrangement, kerosene is sucked out from the oil level device 5.

In addition, when the air volume increases to a certain extent and the force due to the static pressure inside the air supply pipe 1 becomes larger than the weight of the on-off valve 23, the on-off valve 23 automatically opens, thereby allowing the bypass pipe 22 to directly exit the air. Therefore, the upper limit of the amount of kerosene sucked out can be regulated without further increasing the amount of air blown to the nozzle section 2.

The kerosene that has been sucked out is continuously torn off by the air flow, becomes fine particles, and collides with the vaporization surface 15 of the vaporization chamber 14 at an extremely high speed, as shown by the dotted line arrows in FIG.

The kerosene particles are heated and vaporized on the vaporization surface 15 where they collided, and become a premixture of molecular fuel and air, which passes through the curved flow path 20 formed by the convex portions 17 and 18 as shown by the solid arrow. It reaches the combustion port 19, where it is ignited and combusted by an appropriate ignition means.

The operations described above will be explained in more detail below.

First, with the configuration of this embodiment, there is no need to use equipment such as a pump for forcibly supplying kerosene, and the air flow supplied to the nozzle section 2 allows kerosene to be supplied according to Bernoulli's law as described above. Supply takes place.

According to this principle, since the air flow rate and the kerosene flow rate are approximately proportional, when changing the combustion amount, the kerosene flow rate can be easily changed by simply changing the air flow rate using the control valve 4.

This means that even if the combustion amount is changed, the premixing ratio of air and fuel remains almost constant, and according to the configuration of this embodiment, even if the amount of fuel supplied is extremely small. It has the advantage that it can be supplied stably and precisely, and that the premixing ratio is constant as mentioned above.

Furthermore, in addition to this feature, since the static pressure in the air supply pipe 1 is made to affect the oil level regulator 5 through the communication pipe 21, an effect of pushing out kerosene corresponding to the amount of air supplied can be obtained. Together with the above, this produces the effect of keeping the premix ratio of kerosene and air constant, and is particularly advantageous when it is desired to increase the amount of kerosene supplied per air flow rate.

A further significant feature of the above embodiment is that the vaporization of kerosene is extremely stable and is carried out at low temperatures.

That is, the kerosene turns into fine powder X and heads towards the vaporization surface 15 of the vaporization chamber 14 along with the airflow ejected from the nozzle part 2, so it collides with the vaporization surface 15 at an extremely high speed without being decelerated, and the collided kerosene Since it spreads thinly over the vaporization surface 15 and is hit by the air flow, a phenomenon that is very favorable for the vaporization of kerosene appears.

To explain this point in more detail, the following two points are important for stably and quickly vaporizing kerosene.

The first point is the heating of the kerosene adhering to the vaporization surface 15, and the second point is the diffusion of kerosene molecules from the heated kerosene surface.

Regarding the first point, in order to heat quickly, if the conditions such as the temperature of the vaporization surface 15 are the same, kerosene fine powder
It is effective to spread it as thinly as possible on the vaporizing surface 15.

In this respect, in the embodiment, since the kerosene fine particles The shape is very convenient for rapidly heating the entire fine particle X by heat conduction from the .

Regarding the second point, in order to quickly vaporize it, it is effective to reduce the thickness of the diffusion layer S of kerosene molecules, and this embodiment also has an unprecedented feature in this respect. have

That is, in the above embodiment, the air jet forms a dog-like flow with a very high velocity gradient above the kerosene, so that the kerosene molecules vaporized and released from the surface of the kerosene are quickly carried away.

Therefore, the diffusion layer S of kerosene molecules formed on the vaporizing surface 15 becomes extremely thin.

On the other hand, if the air flow rate increases due to a difference in the capacity of the blower device 3 due to non-uniformity in manufacturing or due to some abnormality in the blower device 3, the amount of fuel flowing out will also increase, and the amount of fuel flowing out will increase, reaching the specified maximum. If the combustion amount is exceeded, the on-off valve 23 provided in the bypass pipe 22 will automatically open due to the increase in the static pressure inside the air supply pipe 1, allowing the excess primary air to escape directly to the outside from the bypass pipe 22. , ensuring safe combustion at all times.

As described above, the combustion device according to the present invention has extremely excellent characteristics that have not been seen before in terms of the vaporization and mixing of kerosene and the ability to maintain the balance between the amount of fuel and the amount of air under any conditions. At the same time, excess air blown than necessary is released to the outside, thereby preventing excessive intake of fuel due to an increase in the amount of air blown, and achieving a safe combustion effect that meets standards.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of a main part showing an embodiment of the combustion apparatus according to the present invention, and FIG. 2 is an explanatory diagram of the fuel vaporization action. In the figure, 1 is an air supply pipe, 2 is a nozzle part, 3 is a forced air blower, 11 is a fuel supply pipe, 12 is a fuel supply port, 14 is a vaporization chamber, 22 is a bypass pipe, and 23 is an on-off valve.

Claims (1)

[Claims] 1 The fuel supply port of the liquid fuel supply device is placed in the air passage of the forced air blower, and the fuel sucked from the supply port by the air passing through the air passage is mixed and ejected into the vaporization chamber together with the air. At the same time, a bypass passage is provided in the air passageway to allow a part of the air to be guided to the outside without passing through the installation part of the supply port, and the bypass passage is provided with an on-off valve that opens and closes depending on the static pressure in the air passageway. A liquid fuel combustion device characterized by being provided with.