JPH0124966B2 - - Google Patents

Description

[Detailed Description of the Invention] "Objective of the Invention" (Industrial Application Field) The present applicant has previously discovered that it is possible to improve combustion efficiency and heat exchange rate and reduce combustion noise as a domestic oil water heater. Developed a heat exchanger with the same technology, and filed a patent application for this on May 17, 1981.
No. 83799 (Unexamined Japanese Patent Publication No. 58-200911).

The present invention relates to the heat exchange device (hereinafter referred to as
This invention relates to an improvement of a combustion device used in a prior application device).

(Conventional Combustion Device) FIG. 4 is a side sectional view showing the device of the prior application;
The figure is an enlarged plan sectional view of the device of the prior application.
As shown in FIG. 4, the combustion device 1 installed in the device of the prior application has a complete combustion tube 3 connected to the tip of a gun type burner 2 with a vaporization heat inlet 4 having a predetermined opening width. It consists of Therefore, in the combustion apparatus 1, a combustion method called a combustion gas recirculation method is performed. As shown in FIG. 5, in this combustion method, in the gun type burner 2,
Combustion air sent from the air pipe 6 and kerosene particles sprayed from the spray nozzle 5 in the blast pipe 6 are mixed, and in the complete combustion pipe body 3, this air mixture is sent from the vaporization heat introduction port 4. It mixes the combustion gas to be sucked in appropriately. That is, the mixture is
The kerosene particles are rapidly heated by the combustion gas, and in particular the kerosene particles therein are further atomized or vaporized. Moreover, the air-fuel ratio, which shows a tendency for excess air in the mixture,
By mixing combustion gas, the mixture ratio is appropriately adjusted (diluted) so as to approximate the stoichiometric mixture ratio. Therefore, in the complete combustion tube body 3, blue flame combustion, which is a suitable combustion state for this type of heat exchange device, can be obtained. Also,
Since the amount of excess air contained in the air-fuel mixture is reduced in this way, cooling of the combustion gas after blue flame combustion is also suppressed, resulting in excellent combustion efficiency. At the same time, since the amount of carbon generated is reduced, the amount of carbon adhering to the inner surface of the can body 7 is suppressed, and the heat exchange rate is also improved. Of course, since re-ignition of the combustion gas does not occur continuously, the flame in the complete combustion tube body 3 is maintained in a stable state, and combustion noise is also reduced. As described above, the device of the prior application can significantly improve combustion efficiency and heat exchange rate, and reduce combustion noise, compared to a heat exchange device equipped with a combustion device consisting of a gun-type burner alone. It was something that would come out. In addition, a rotary gasification burner and a heater gasification burner (both not shown)
Unlike heat exchange equipment with combustion devices such as
There is no risk that the structure will become complicated or large.

Incidentally, the can body 7 of the device of the prior application is formed into a vertically elongated cylindrical shape, and the lower half inside thereof forms a combustion chamber 8. The outer wall portion of the can body 7 includes an inner can 7a and an outer can 7.
A contact area 14 is formed between the inner and outer cans 7a and 7b to store water as a fluid to be heat exchanged. A heat insulating material 15 is applied to the outer surface of the can body 7, and the can body 7 is housed inside an exterior body 16.
The can body 7 also includes an exhaust chimney 17 and an outlet 1.
8, a water supply port 19, a drain section 20, and a combustion gas diffusion cylinder 21 (internal structure not shown).

(Problems to be Solved by the Invention) As shown in FIG. 4, the gun-type burner 2 of the combustion device 1 is formed so that the blast pipe 6 thereof is bent upward in the middle. The reason for this is that in order to make the heat exchange device for home use, the overall size of the heat exchange device must be kept small, and there was a demand to make the storage space for the ventilation fan 9 as narrow as possible. Therefore, the combustion air sent by the blower pipe 6 is affected by the directivity according to its bent shape or by the directivity characteristic of the blower fan 9 itself. Therefore, around the nozzle end of the spray nozzle 5 (see FIG. 5), a biased flow occurs such that, for example, the lower layer flow has an excess amount of air and the upper layer flow has an insufficient amount of air. Such a drift causes imbalance in the amount of combustion gas mixed into the air-fuel mixture, as well as maladjustment of the air-fuel ratio in the air-fuel mixture and destabilization of the flame. Although not as bad as other conventional combustion devices, there was a risk that combustion efficiency and heat exchange rate would decrease and combustion noise would occur.

The present invention has been made in view of the above-mentioned circumstances, and is a novel combustion system for a heat exchange device that makes it possible to reliably and maximize the advantages of the device of the prior application without complicating the structure. The purpose is to provide a device (hereinafter referred to as the device).

"Structure of the Invention" (Means for Solving the Problems) The gist of the present device is that it is attached to a can body that has a contact area for the fluid to be heat exchanged on the outer wall and a cylindrical combustion chamber inside. In a combustion device for a heat exchange device, a combustion air blow pipe whose tip opening is positioned toward the combustion chamber of the can body, and a liquid fuel spray nozzle disposed inside the blow pipe; A complete combustion pipe body is connected to the tip opening of the blast tube with a vaporization heat inlet having a predetermined opening width, and the tip opening of the blast tube has a central hole corresponding to the nozzle end of the spray nozzle. and a spouting plate having a peripheral hole located on the outer periphery of the central hole, and a peripheral hole having a diameter larger than the inner diameter of the central hole in the spouting plate is attached to the outer peripheral surface of the spray nozzle. The point is that a combustion air direction correcting collar is provided which is formed to have a smaller diameter than the installed position diameter.

(Function) Among the combustion air flowing inside the blast pipe, the air sent to the nozzle end side along the outer peripheral surface of the spray nozzle collides with the orientation correction collar provided on the outer peripheral surface of the spray nozzle. Once upon a time, it was forced to spread closer to the inner circumferential surface of the blast pipe. At this time, even if a biased flow occurs in the air flow on the upstream side of the orientation correcting flange, the biased flow is canceled by the air spreading action by the orientation correcting flange, and near the inner circumferential surface of the blast pipe, the biased flow is eliminated in the circumferential direction. This results in an air flow with a uniform amount of air. Therefore, the kerosene particles sprayed from the spray nozzle are mixed with the combustion air, and the mixture and the combustion gas are mixed uniformly along the circumferential direction of the tip opening of the blast pipe. Therefore, it is finally adjusted to approximate the theoretical mixture value. Further, there is no fear that the jet flow of combustion air sent from the blast pipe to the complete combustion tube will destabilize the flame in the blue flame combustion state in the complete combustion tube.

(Example) The present invention will be described below based on drawings showing examples thereof.

FIG. 1 is a perspective view showing the main parts of the device, with a part thereof cut away. In the gun type burner 13, this device has a blower pipe 6.
A combustion air direction correcting collar 10 is provided on the outer peripheral surface of the spray nozzle 5 disposed inside the combustion air. Further, a blowout plate 11 is attached to the tip opening of the blower pipe 6, and the blowout plate 11 has a central hole 11a and a circumference having a close positional relationship with respect to the spray nozzle 5 and the orientation correction collar 10. A hole 11b is bored.

The ejection plate 11 is attached so as to close the entire tip opening of the blast pipe 6. The ejection plate 11 has a central hole 11a and a central hole 11a.
A plurality of circumferential holes 11b, 11b, . The central hole 11a is for ejecting kerosene particles, and the kerosene particles also entrain some combustion air. Further, the peripheral hole 11b is for blowing out most of the combustion air. The circumferential holes 11b are each bored at a predetermined angle in the circumferential direction,
A swirling flow is generated in the ejected air to uniformly mix kerosene particles and combustion air.

In the gun type burner 13, a direction correction collar 10 attached to the outer peripheral surface of the spray nozzle 5
As shown in the side cross-sectional view in FIG. The positioning of the orientation correcting collar 10 in the longitudinal direction of the spray nozzle 5 is arbitrarily determined as long as it does not adversely affect the spray state of kerosene particles at the nozzle end of the spray nozzle 5. Further, the outer diameter dimension of the orientation correction collar 10 must be such that it does not adversely affect the flow of air ejected from the peripheral hole 11b of the ejection plate 11 with respect to the combustion air sent into the blast pipe 6. It is said that That is, the ejection plate 11
, it is important that each peripheral hole 11b, 11b, . . . has an outer diameter smaller than the diameter dimension in which it is drilled and arranged. In addition, in order to be able to suppress the amount of combustion air mixed into the mixture of kerosene particles and combustion air injected from the central hole 11a of the jetting plate 11, the central hole It is important that the diameter is larger than that of 11a.

The complete combustion tube body 3 connected to the tip of the gun type burner 13 includes a mixing tube 22, a flame rectifying tube 2
3. Consists of a flame fixing tube 24 and a flame holding plate 25. The mixing tube 22 has the flame rectifying tube 23 and the flame fixing tube 24 inserted into the front half portion whose diameter is expanded into a funnel shape. Further, the flame stabilizing plate 25 is connected to the complete combustion tube body 3
It is fixed at the center of the spray nozzle 5 so as to be perpendicular to the spray direction of the kerosene particles in the spray nozzle 5. In addition, the flame stabilizing plate 25 and the flame rectifying tube 23
Both are made of stainless steel punched metal (porous plate material). The complete combustion pipe body 3 and the gun type burner 1
Vaporization heat introduction port 4 formed between the blower pipe 6 of No. 3
The water heating capacity of the heat exchange device is 35000Kcal/h.
, and if the inner diameter of the air pipe 6 is 80 mm, then
A range of 8 to 20 mm is considered appropriate. The optimum diameter was 15mm.

The operating status of this device is as follows. When combustion air is blown into the blast pipe 6, the air flowing along the outer circumferential surface of the spray nozzle 5 collides with the orientation correction collar 10 and is pushed out toward the inner circumferential surface of the blast pipe 6. It will be done. Therefore, around the nozzle end of the spray nozzle 5, a high speed air flow with a uniform flow rate is generated near the inner peripheral surface of the blast pipe 6, and a low speed air flow with a uniform flow rate is generated near the nozzle end of the spray nozzle 5. Become. That is, the biased flow direction imparted to the flow of combustion air is eliminated by the direction correcting collar 10. Therefore,
When kerosene particles are sprayed from the spray nozzle 5, the kerosene particles are appropriately mixed with the low-velocity air flow.
Then, when a spark is blown against this air-fuel mixture at the tip of the electrode rod 12 (see FIG. 2), yellow flame combustion is started in the vicinity of the front part of the ejection plate 11 in the blast pipe 6. This combustion flame gradually moves forward along the spray direction of the kerosene particles and reaches the flame rectifying pipe 23 and the flame stabilizing plate 25. The flame on the flame stabilizing plate 25 is in a stable state, and becomes a straight radiant flame that spreads to some extent from the flame fixing tube 24 toward the front thereof. The flame fixing tube 24 makes the flame distribution in the radiant flame uniform and further stabilizes it. The combustion gas generated from this radiation flame flows along the inner surface of the inner can 7a of the can body 7 (see Fig. 5), returns to the vaporization heat introduction port 4, and is sucked into the complete combustion tube body 3. Become so. Here, since the air jetted out from the peripheral hole 11b of the jetting plate 11 is a high-speed airflow flowing along the inner circumferential surface of the blast pipe 6, as described above, it is generated at the vaporization heat introduction port 4. Suction power (negative pressure)
It is also uniform and strong in the circumferential direction. Therefore, in the complete combustion pipe body 3, a mixture of combustion air (low-velocity air flow) and kerosene particles,
Furthermore, the combustion gases are actively mixed. Therefore, the advantages that were intended to be achieved in the device of the prior application can be reliably and maximally achieved.

(Study of another embodiment) FIG. 3 is a side sectional view showing another embodiment of the present device. A separation wall 10b that surrounds the nozzle end of the spray nozzle 5 over the entire circumference is integrally formed on the orientation correction collar 10 of this embodiment. The orientation correcting collar 10 is provided with an air inflow hole 10a for supplying a predetermined amount of baking air to the spray nozzle 5. Therefore, the airflow that has once been forced out toward the inner circumferential surface of the blower tube 6 by the orientation correcting collar 10 is completely blocked from the spray nozzle 5 by the separation wall 10b. That is, the air inflow hole 10 of the orientation correction collar 10 is connected to the nozzle end of the spray nozzle 5.
Only the amount of air that has passed through a will be supplied, and in the mixture of kerosene particles and combustion air,
This makes it easier to approximate the air-fuel ratio to the stoichiometric mixture ratio.
In this way, the shape and configuration of the present device can be changed as appropriate depending on the mode of implementation.

"Effects of the Invention" As is clear from the above description, in the combustion device according to the present invention, in the gun type burner, a high-speed air flow with a uniform flow rate in the circumferential direction is generated near the inner peripheral surface of the blast pipe, Near the nozzle end of the spray nozzle, a low-speed air flow with a uniform flow rate in the circumferential direction is generated. Therefore, the amount of air mixed into the mixture of kerosene particles and combustion air can be suppressed to a small amount. Further, at the vaporization heat introduction port formed between the gun type burner and the complete combustion pipe body, a high-speed air flow is ejected around the ejected flow of the air-fuel mixture. Therefore, the combustion gas in the combustion chamber of the can body is strongly sucked through the vaporization heat introduction port, so that the high-speed air flow and the air-fuel mixture are heated all at once.
In this way, the mixture ratio of the air-fuel mixture and the combustion gas is ultimately adjusted to approximate the stoichiometric mixture ratio, and blue flame combustion, which is suitable for this type of heat exchange device, is obtained. As a result, a heat exchange device equipped with the device of the present invention can reliably and maximize the advantages of the device of the prior application, and can improve combustion efficiency and heat exchange rate and reduce combustion noise. Furthermore, the present device has many excellent advantages, such as the advantage that it can be implemented extremely simply by adding a few components to the combustion device of the prior application device.

[Brief explanation of drawings]

Figures 1 to 3 show the device, in which Figure 1 is a partially cutaway perspective view showing the main parts, and Figure 2 is a partially cutaway perspective view showing the main parts.
The figure is a side sectional view, FIG. 3 is a side sectional view showing another embodiment, FIG. 4 is a side sectional view showing a heat exchange device according to the earlier application, and FIG. 5 is an enlarged view of the earlier application device. FIG. 3... Complete combustion pipe body, 4... Vaporization heat introduction port, 5
... Spray nozzle, 6 ... Air pipe, 7 ... Can body, 8
... Combustion chamber, 10 ... Orientation correction flange, 11 ... Ejection plate, 11a ... Central hole, 11b ... Peripheral hole, 13
...Gun type burner, 14...Contact area.

Claims (1)

[Claims] 1. In a combustion device for a heat exchange device that is attached to a can body having a contact area for a fluid to be heat exchanged on an outer wall portion and a cylindrical combustion chamber formed inside, a tip opening facing into the combustion chamber of the can body is provided. A blow pipe for combustion air located in the air pipe, a spray nozzle for liquid fuel disposed inside the blow pipe, and a vaporization heat inlet having a predetermined opening width held at the tip opening of the blow pipe are connected to each other. a complete combustion pipe body, and a jetting plate having a central hole corresponding to the nozzle end of the spray nozzle and a peripheral hole located on the outer periphery of the central hole is attached to the tip opening of the blast pipe. A combustion air direction correcting collar is provided on the outer circumferential surface of the spray nozzle and has a diameter larger than the inner diameter of the central hole in the ejection plate and smaller in diameter than the diameter of the peripheral hole. A combustion device characterized by: