JPS58179718A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To expand high-load combustion and the width of combustion by mutually making a plurality of fuel injection holes and a plurality of air injection holes correspond and providing them so that the directions of ejection are opposed and moving the air injection holes to the downstream side of a combustion gas with the reduction of the quantity of combustion. CONSTITUTION:Fuel is ejected from the fuel injection holes 29 through a fuel chamber 17 from a fuel supply port 19 formed to an inverted cone 9 while air is ejected from the air injection holes 21 through a bellows pipe 24 and an air chamber 13 from an air supply port 23 formed to a cone 10. Fuel and air are mixed in a combustion chamber 22, and ignited and burnt. In this case, a cylindrical body 12 continuously set up to the lower section of the cone 10 is pushed down through a shaft 15 by a motor 16 on maximum combustion, and the fuel injection holes 20 and the air injection holes 21 are made correspond at 1 to 1. On the other hand, the cylindrical body 12 is pushed up on minimum combustion, the number of the air injection holes 21 is made smaller than the fuel injection holes 20 in the combustion chamber 22, the mutual injection holes 20, 21 are not brought to the states in which they are not made to correspond, and the quantity of combustion is changed.

Description

[Detailed Description of the Invention] The present invention realizes high-load combustion in combustion equipment such as water heaters and space heaters, and greatly expands the function of changing the capacity. The present invention relates to a combustion device that aims to simplify the process.

An example of a conventional high-load combustion device is shown in Figure 1. An air supply plate 3 having air holes 2 is provided on the peripheral surface of the flame hole 1 in the fuel injection direction. The flame hole 1 is connected to a fuel supply port 4 through a fuel supply pipe 5. - Mechanical stomata 2 is
It communicates with the air supply port 6 via an air chamber 7. 8 is a spark plug. In this configuration, a mixture of fuel and air supplied from the fuel supply pipe 5 as shown by the arrow is ejected from the flame hole 1, and at the same time, air forcibly sent from the air supply 16 by a fan etc. As shown by the arrow, the flame is ejected from air hole 2 at an angle so as to hit the air-fuel mixture, and is ignited by spark plug 8 to form a flame, but the flame is ejected not only from flame hole 1 but also from air hole 2. As the air and mixture diffuses and a flame is formed along the air streamlines of air hole 2,
Since combustion occurs in the area surrounded by the air holes 2 and flame holes 1, high-load combustion can be achieved, but when the amount of combustion is reduced, the stable combustion region becomes narrower. An example of this is shown in FIG. 5. The stable combustion range is the one where there is too much air for the amount of combustion, causing the flame to blow out and generate CO, resulting in CO/CO2 > 0.005, and the one where there is not enough air for the amount of combustion, causing yellow flame and Go to be generated.
□> o, o o s This is indicated by the notching region surrounded by the line B, but as shown in the figure, when the combustion amount is decreased, the allowable width of the amount of air for stable combustion becomes smaller. This is because the amount of air that determines the flame blowout limit and the yellow flame limit with respect to the combustion amount is determined by the configuration of the flame hole 1 and the air hole 2. Therefore, if the amount of combustion decreases, the amount of air must be reduced accordingly, which has the disadvantage that the allowable range of air amount for stable combustion becomes narrower. In addition, in order to reduce the combustion amount and air amount within the stable combustion region, K is a fuel supply control device, an air amount control device, an air amount control device for the air-fuel mixture, and their control circuits, etc. to reduce the amount of combustion air in the stable combustion region. Because it requires complex control and the stable combustion range becomes narrower, it is necessary to improve the precision of the control-related parts listed in F, and it is necessary to improve the accuracy of the control-related parts listed in F.
n Down Rati.

(TDR) had a limit of 14 and had many drawbacks, such as the inability to make wide changes in ability.

The present invention eliminates these conventional drawbacks, and aims to improve usability by realizing high-load combustion and widely varying the amount of combustion, and also makes it possible to control changes in the amount of combustion. The purpose of this is to simplify the control configuration.

In order to achieve this object, the present invention provides a plurality of air ejection holes corresponding to a plurality of fuel ejection holes, and the air ejection holes are provided so that their ejection directions are opposite to each other or collide with each other at a certain angle. The hole is configured to move toward the downstream side of the combustion gas as the amount of combustion decreases.

With this configuration, fuel and air from multiple fuel nozzles and air nozzles collide and mix, forming a flame, and diffusion creates a flame front around the air nozzles, achieving high-load combustion and reducing the amount of combustion. On the other hand, since the air nozzles move downstream of the combustion gas, the number of air nozzles corresponding to the fuel nozzles decreases according to the amount of combustion, even if the air volume remains the same. is ensured, and the air from the air outlet on the downstream side of the combustion gas is discharged as surplus air that does not participate in combustion. Therefore, there is no need to control the amount of air, and only a fuel supply control device and an air nozzle moving device are required.
The control configuration is also simplified, and since the amount of air can be kept constant, and TDR can be achieved only with the accuracy of fuel supply control, it is possible to vary the combustion amount more widely than in the past.

An embodiment of the present invention will be described below with reference to FIG. As shown in the figure, a through hole 11 is provided in which a cone body 1o that supplies air to the bottom force of the inverted cone body 9 moves up and down, and a cylinder 12 that moves up and down in the through hole 11 in an airtight state is integrally formed below the cone body 1°. The interior thereof forms an air chamber 13. An air port 14 and a shaft 16 are provided below the cylindrical body 12, and the shaft 15 is moved by a motor 16. A cylindrical outer wall 18 is provided on the outer periphery of the curved inverted conical body 9 so as to constitute a fuel chamber 17 , and a fuel supply port 19 is attached to the cylindrical outer wall 18 and communicates with the fuel chamber 17 . In this configuration, a plurality of fuel injection holes 20. The air ejection holes 21 correspond to the upper and lower portions of the conical wall surface and the supply ports, and are connected to the air port 14 by a flexible jug 24.

FIG. 3 shows the combustion state at maximum combustion in the above configuration. In this case, the cylinder 12 is moved to the shaft 15 by the motor 16.
The fuel nozzle 2° and air nozzle 21 are pushed down to 1
The fuel is ejected from the fuel supply port 19 through the fuel chamber 17 as shown by the arrow and from the fuel injection hole 20. - Dynamic air is supplied by a fan or the like from the air supply port 23 to the bellows tube 24 as shown by the arrow. The air passes through the air chamber 13 and is ejected from the air ejection hole 21. The ejected fuel and air are mixed in the combustion chamber 22, and when ignited, the flame forms a premixed-secondary flame zone with many uneven cylindrical shapes shown by the solid lines along the air ejected flow line, and unburned components. CO or H2 forms a secondary flame above the combustion chamber 22 and is completely combusted in the area shown by hatching. High-load combustion is achieved by aligning and mixing the air and fuel with the finely divided fuel and air injection holes. Next, FIG. 4 shows the combustion state at minimum combustion by taking TDR. In this case, the cylindrical body 12 is pushed upward by the shaft 16 by the motor 16, and the number of air nozzles 21 is reduced compared to the fuel nozzle holes 2o in the combustion chamber 22, and the nozzles are mutually opposite to each other. It becomes a state where it is not compatible. Fuel and air are supplied as shown by the arrows and are ejected from the nozzle holes 20 and 21, respectively. When ignited, the flame spreads along the air flow line above the combustion chamber 22 into a small number of concave and convex cylindrical premixtures shown by solid lines in the figure. A secondary flame zone is formed, and the outside gas forms a secondary flame above the combustion chamber 22 as shown in Figure 3, and is completely combusted in the area shown by the hatching. The structure is such that combustion can be completed with just one. This is the combustion chamber 22
The space below is only for fuel from the fuel nozzle 2o,
Furthermore, the air outlet 21 at the bottom! Even in the combustion chamber near L, the air-fuel mixture is below the flammability limit, so no primary flame is formed, and the secondary flame only needs to be located several steps above the air nozzle 21, so the secondary flame is also located at -F. It is completely formed by a part of the protruding air nozzle 21, and the volume required for combustion does not exceed the flame zone at the time of maximum combustion shown in FIG. At this time, the air from the upper hole 21b of the air jet hole 21 is mixed with combustion exhaust gas and discharged as surplus air not related to combustion. Since the bellows tube 24 is flexible, it can cope with the vertical movement of the cylinder 12. That is, as the amount of combustion decreases, the cylinder 12 is sequentially raised, the air nozzle 21 is also raised, and the primary flame zone is moved above the combustion chamber 22 by sequentially decreasing the number of air nozzles 21 that interfere with combustion. The air supply rate is constant and complete combustion is achieved in the same combustion chamber. Arrangement of blowholes 20.21.

By adjusting the amount of movement of the cylindrical body 12, any desired TDR can be obtained. In this embodiment, the fuel side is not in a mixture state, but it may be a mixture of air and fuel, and the shape of the nozzle hole and the relative position of the air and fuel nozzle holes 20 and 21 are such that the jet streams collide with each other. Of course, any configuration is fine.

In this way, a plurality of fuel fl injection holes 20. The air jet holes 21 are provided correspondingly to the lower solid wall 7, and the air jet holes 21 are arranged in correspondence with the lower solid wall 7.
By moving the conical body 1o having a shape to the downstream side of the combustion gas, as shown in Fig. 6, the amount of air is kept constant and only the amount of combustion is changed, and complete combustion occurs within the hunting region C, as shown in the straight line opening. As shown, the one from one foot is T by the control of straight line A.
Although the limit is only one DR, there is an effect that the TDR range can be widened. In addition, as before, the combustion amount,
There is no need to reduce both the air amount and TDR, and the air amount remains constant and only the combustion amount needs to be changed, which has the effect of simplifying control.Furthermore, unlike conventional methods, TDR requires only one air The combustion range cannot be achieved without improving the quantitative accuracy of the amount of fuel, and simply controlling the amount of combustion can have positive effects. Furthermore, as the amount of combustion decreases, the air outlet 21 also rises, and excess air that does not contribute to combustion is exhausted together with the combustion gas, which has the effect of keeping the thermal efficiency of water heaters, etc. constant.

As described above, according to the combustion device of the present invention, the plurality of fuel injection holes and the plurality of air injection holes are made to correspond to each other so that the injection direction is
By arranging them so that they collide with each other at opposite angles or at an angle, and by configuring the air jet holes to move toward the downstream side of the combustion gas as the amount of combustion decreases, high-load combustion can be achieved and the amount of combustion can be greatly increased. It is possible to improve usability by changing the TDR by changing the air flow rate, simplifying the control configuration because the air flow rate can be constant, and making it easier to control since the TDR can be obtained by simply controlling the combustion amount, that is, the fuel. It will be done.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a high-load combustion device from one day ago, Fig. 2 is a cross-sectional perspective view of a combustion device according to an embodiment of the present invention, and Fig. 3 shows the combustion state at maximum combustion in Fig. 2. 4 is a sectional view showing the combustion state at minimum combustion, and FIG. 6 is a characteristic diagram showing the stable combustion region. 20... Fuel injection hole, 21... Air injection hole. 16...shaft, 16...motor. Name of agent: Patent attorney Masao Nakao and 1 other person No. 1
1111 Figure 2 Figure 3

Claims (1)

[Claims] Air is forcibly supplied in the opposite direction or at a certain angle to the fuel jetting direction, and multiple air jetting holes correspond to multiple fuel jetting holes, and the jetting directions are opposite to or at an angle and collide with each other. A combustion device in which the air ejection hole is movable, and the air ejection hole moves downstream of the combustion gas as the amount of combustion decreases.