JPS5933951Y2 - hot air heater - Google Patents

Description

[Detailed description of the invention] This invention relates to a hot air heater that uses combustion heat, for example, and aims to provide effective heating.

In conventional hot air heaters of this type, the speed of the air from the blower was almost the same all the way to the hot air outlet, so the hot air did not reach deep into the room, causing the temperature to drop. It had the disadvantage that the difference was large.

This idea is to narrow the cross-sectional area of the open opening of the air passage provided to attract hot air from the heat radiation source compared to the air passage, thereby increasing the flow velocity of the air through the opening and discharging the warm air further. By doing so, more effective heating with less temperature difference was possible.

This invention will be explained below based on an illustrated embodiment in which the invention is applied to a kerosene-burning hot air heater.

In the figure, 1 is a base case fixed on a plate plate 2, 3 is a main case 4 fixed on this base case, and 5 is an air passage formed on the back side of this case, and 5 is the upper end of this air passage. The opening is opened horizontally and communicates with the upper part of the combustion chamber 6 formed inside the main body case 3.

Therefore, the cross-sectional area of the opening 5 is smaller than that of the air passage 4.

Numeral 7 is a warm air discharge port opened at the upper front of the main body case 3 corresponding to the opening 5, and 8 is fixed horizontally to the lower part of the main body case 3 so as to partition the base case 1 and the combustion chamber 6. The partition plate has a central hole 9 and a plurality of side holes 10.

Reference numeral 11 denotes a decorative front plate detachably attached to the front part of the main body case 3 like FJ5, and a looper portion 12 corresponding to and communicating with the hot air discharge lower is provided on the upper part.

13 is a combustion blower having two blowers, 14 is an air supply pipe whose one end is connected to the air outlet of one of the blowers, 15 is a nozzle connected to the other end of this supply pipe, and 16 is a nozzle connected to the other end of the supply pipe. An air flow control valve connected to the supply pipe.

Reference numeral 17 denotes a combustor, in which the tip of the nozzle 15 is fitted and fixed into a hole penetrating the peripheral side wall of a vaporizer 190 that is preheated by a heater 18, and a vaporization chamber 20 communicating with this nozzle is connected to a baffle plate. It has a configuration in which it communicates with a flame port 22 formed in the upper edge peripheral wall through a communication hole 21.

23 is a constant liquid level device connected to the fuel tank T via a connecting pipe 24; 25 is a float floating on the fuel in this constant liquid level device;
A needle valve body fixed to the head of the fuel tank 24 in correspondence with the outlet of the connecting pipe 24 keeps the fuel level in the container constant.

Reference numeral 26 denotes a fuel supply pipe, one end of which is connected to the bottom of the constant liquid level device 23, the middle part penetrates into the air supply pipe 14 near the nozzle 15, and the other end becomes a thin tube 27 for supplying fuel to the tip. The mouth 28 is arranged facing the throat of the nozzle 15.

Thus, the fuel supply port 28 is positioned above the fuel level of the level regulator 23 by a predetermined height.

29 is a bypass pipe that guides the air static pressure near the nozzle 15 to the upper space of the constant liquid level device 23; 30 is a combustion cylinder provided on the partition plate 8 and whose upper surface is open; the lower end periphery is outside the center hole 9;
And it is located inside the side hole 10.

Thus, the flame port 22 portion of the combustor 17 passes through the central hole 9 with a gap and is exposed at the lower part of the combustion tube 30.

31 is a wind guide duct whose one end is connected to the other blower of the blower 13 and the other end is connected to the lower end of the air passage 4; 32 is a peephole provided in the decorative front panel 11; 33 corresponds to this peephole. A transparent glass 3 is provided on the peripheral wall of the combustion tube 30 corresponding to the transparent part 34, which is obtained by cutting out the front wall of the combustion chamber 6.
Reference numeral 5 denotes a diffusion plate that extends horizontally from the upper part of the front wall of the combustion chamber 6 to the center of the combustion chamber.

. Therefore, the shapes and related dimensions of the diffuser plate and the combustion tube 30 are set so that the hot air (flame) from the flame port 22 is reflected on the inner peripheral surface of the combustion tube 30 and concentrated on the lower surface of the diffusion plate 35. has been done.

In the above configuration, the blower 13 is operated, the air flow control valve 16 is opened, and a predetermined amount of air is supplied to the air supply pipe 14.

At this time, the blow static pressure generated near the inlet of the nozzle 150 according to the air supply amount is guided into the liquid level regulator 23 via the bypass pipe 29, and the liquid fuel that has received this static pressure is transferred to the fuel supply. It is pushed out through the tube 26 and thin tube 27 to the fuel supply port 28 at the tip thereof.

In addition, at this time, the liquid fuel is sucked from the fuel supply port 28 by the air flow that passes through the throat of the nozzle 15 and becomes high speed due to its venturi action, and the liquid fuel pushed out by both of these functions together with the high speed air flow. The gas and liquid are mixed, atomized, and injected, collide with the inner wall of the vaporization chamber 20, that is, the vaporization surface, which has been preheated by the heater 18, and adhere to the vaporization surface to be spread, thereby vaporizing the vaporized fuel and the fuel from the nozzle 15. The mixture is mixed with high-speed air and detoured through the flow holes of the baffle plate 21, resulting in even more sufficient gas-liquid mixing before being ejected from the flame port 22.

The air-fuel mixture ejected from this flame port is ignited by an appropriately provided ignition means, and is completely combusted as it is.

By the way, in the vaporization chamber 20, the fuel that collides with the vaporization wall is spread thinly on the vaporization wall soil, and the entire fuel particles are rapidly heated and vaporized by the heat of the vaporization wall.
Since the air jet forms a flow with an extremely large velocity gradient above the fuel particles, it not only spreads the fuel particles even thinner, but also quickly carries away the fuel molecules, reducing the fuel diffusion layer that forms on the vaporized wall soil. It becomes extremely thin and burns completely.

Fuel is supplied according to the so-called Bernoulli's law by the air flow supplied to the nozzle in this way, so the air flow rate and the fuel flow rate are approximately proportional, so when changing the combustion amount, the air flow control valve 16 You can easily change the amount of combustion by simply changing the air flow rate.

This means that even if the combustion amount is changed, the premixing ratio of air and fuel remains approximately constant, and complete combustion is always achieved.

The hot combustion air (flame) at the flame port 22 hits the inner surface of the combustion tube 30, turns its direction inward, and tends to converge, and then hits the back surface of the diffuser plate 35 in a concentrated manner, and then is diffused and reaches the surface. Head over.

On the other hand, by operating the blower 13, cold air is blown from the air guiding duct 31 into the air passage 4, and this cold air is blown out horizontally from the opening 5 toward the hot air discharge lower.

At this time, since the cross-sectional area of the open port 5 is smaller than the cross-sectional area of the air passage 4, that is, the cold air is narrowed at the open port 5, so the flow velocity of the cold air blown out from the open port 5 increases. , this lowers the pressure in the core.

Therefore, the hot air diffused by the diffusion plate 35 is
The hot air is drawn into the cold air and mixes well with the cold air to reach the hot air discharge lower.

Secondary air enters the combustion tube 30 through the central hole 9 to make combustion more complete, and external air also flows into the combustion tube 30 through the side holes 10.

This inflowing air from the side holes acts to help the hot combustion air rise smoothly and at the same time to suppress the rise in temperature of each wall surface.

By adjusting the degree of opening of the air flow control valve 16, the degree of combustion from the flame port 22 of the combustor can be freely selected.

As is clear from the above examples, this invention is designed to narrow the open opening of the air passage to the inside of the main body so that the hot air from the heat radiation source is attracted and mixed with the cold air heading towards the hot air outlet. Since the back part is open, the hot air from the heat radiation source can be radiated further away, thereby making it possible to perform effective heating.

[Brief explanation of the drawing]

FIG. 1 is a half-wave front view showing an embodiment of this invention, FIG. 2 is a simplified longitudinal cross-sectional view thereof, and FIG. 3 is a simplified cross-sectional view showing the configuration of the dawn mechanism. In the figure, 3 is the main body case, 4 is the air path, 5 is its opening, 6 is the combustion chamber, 7 is the hot air outlet, 12 is the louver 13 is the blower,
17 is a combustor.

Claims (1)

[Scope of utility model registration request] A heat dissipation source provided in the lower part of the main body, and a hot air outlet formed on the back of the main body, the lower end of which communicates with the blower, and the upper end of which is open to face the hot air outlet formed above the front of the main body. said air passage, and said open opening is configured such that hot air rising from said heat radiation source is attracted by cold air blown from said open opening at the upper end of said air passage, is mixed with cold air within said main body, and is blown out from said hot air outlet. A hot air heater that is configured to narrow the air from the air path and open it at the back of the main body.