JPS5852445Y2 - hot air heater - Google Patents

Description

[Detailed explanation of the invention] This invention injects liquid fuel such as kerosene into a heated vaporization chamber to vaporize it, combusts the mixture of the vaporized fuel and air, and uses the combustion heat. This relates to a hot air heater.

Conventionally, this type of hot air heater requires means such as a pump to forcefully supply liquid fuel, and since liquid fuel and combustion air are supplied separately, it is difficult to control the amount of combustion. Furthermore, in the case of a small combustion amount, it is difficult to finely adjust the fuel supply amount, resulting in unstable combustibility, and the tube has various points that can only be applied to a tube with a substantially high combustion amount.

Therefore, in order to solve this drawback, the fuel supply port is made to face the nozzle part formed in the air passage of the forced air blower,
Using the air pressure flowing through the nozzle part, the liquid fuel supplied from the fuel supply port is injected into the vaporization chamber with air and vaporized, and the mixture of vaporized fuel and air is ignited and burned to generate combustion heat. A hot air heater was developed that utilized the

That is, according to this configuration, fuel supply is automatically performed by air supply, so there is no need for fuel supply means such as a pump, and the amount of fuel supplied changes continuously by simply changing the amount of air supply, so the amount of combustion can be reduced. The above-mentioned drawbacks of the conventional method are improved in all aspects, such as easy control, fine adjustment, stable combustibility, and wide applicability from small combustion to large combustion. was completed.

This invention relates to a hot-air heater with such a configuration, and its purpose is to suppress thermal deformation of various parts due to combustion heat and temperature rise outside the main body to provide safe and effective heating. There is a particular thing.

This invention will be explained below based on illustrated embodiments.

In the figure, 1 is a base case fixed on a plate plate 2, 3 is a main body case fixed on this base case, 4 is an air passage formed on the back side of this main case, and 5 is an 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 said to be smaller than that of the air passage 4.

Reference numeral 7 designates a hot air outlet opened at the upper front of the main body case 3 in correspondence with the outlet 5, 8 a rectangular combustion tube with an open upper surface provided in the combustion chamber 6, and 9 a front surface of this combustion tube. and a heat shielding tube surrounding both sides with a predetermined interval; 10 is a fixing plate that integrally connects the heat shielding tube and the combustion tube 8 at its lower part; 1;
Reference numeral 1 denotes a decorative front plate detachably attached to cover the front part of the main body case 3, and a louver part 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 circumferential wall of a vaporizer 19 that is preheated by a heater 18, and a vaporization chamber 20 that communicates with this nozzle prevents interference. It has a configuration in which it communicates with a flame port 22 formed in the upper edge peripheral wall through a communication hole in the plate 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 30 of the constant liquid level device 23; 31 has one end communicating with the other blower of the blower 13, and the other end communicating with the lower end of the air passage 4. A wind guide duct, 32 is a peephole provided in the decorative front plate 11, 33 is a transparent part obtained by cutting out the front wall of the heat shield tube 9 corresponding to this peephole, and 34 is the front of the combustion tube 8 corresponding to this transparent part. The transparent glass 35 installed on the wall is a hot air guide plate installed horizontally on the upper part of the combustion chamber 6, and extends from the upper surface of the upper end opening 5 of the air passage 4 to the hot air discharge lower, and the side edges thereof hangs down on the outside of both side surfaces of the heat shield tube 9, and overlap each other at the iron portion with a gap 36 between them.

37 is a large number of air holes bored in the fixed plate 10 between the combustion tube 8 and the heat shield tube 9, and 38 is opened in the center of the fixed plate 10 to expose the combustor 17 to the lower part of the combustion tube 8. The openings 39 are mounting pieces that protrude downward at multiple locations at the lower end of the combustion tube 8 and have their lower ends fixed to the fixing plate 10. A gap 40 is formed.

Reference numeral 41 designates an open part formed by cutting out the front surface of the upper part of the heat shield tube 9 in correspondence with the open port 5 of the air passage so as not to obstruct the flow of air from the open port 5 to the hot air discharge lower. There is.

Reference numeral 42 designates a new curved portion formed by folding the ends of both side surfaces of the heat shield tube 9 outward.

The upper part of the outer edge of this bent part is located at the inner edge of both side hanging parts of the guide plate 35, and the corresponding upper inner surface of both sides of the heat shield tube 9 is located at the outer edge of both sides of the opening 5 of the air passage.

That is, the upper part of the heat shield tube 9 is installed between the slightly protruding opening 5 and the guide plate 35, as shown in FIG.

Therefore, the arrangement of each part in the main body case 3 is such that the combustor 17, combustion tube 8, heat shield tube 9, air passage opening 5, etc. are in the center, and the fuel tank T, liquid level regulator 23, etc. are on one side. On the other hand, the blower 13 is further biased to the other side, resulting in a thin and compact shape as a whole.

Therefore, the air passage 4 is disposed diagonally with respect to the opening 5 from the side when viewed from the front of the main body, and the flow of air is in the left-right direction with respect to the opening 5 when viewed from the plane of the main body.

When the direction of the air blown in the left and right direction is changed approximately at right angles from the opening 5 and directed toward the hot air outlet, the amount of air blown is concentrated at the back of the air path at the opening 5, that is, at the end of the air blowing direction before the direction change. In order to prevent this from happening, the cross-sectional area A of the air passage 4 corresponding to the opening 5 is made gradually smaller in the air blowing direction.

On the other hand, the back surface of the combustion tube 8 is parallel to the back surface of the main body, and a gap B having a shape opposite to the cross-sectional area of the air passage is formed between the back surface of the combustion tube 8 and the corresponding outer surface of the air passage. Ru.

In order for one bent portion 42 to reach the deepest portion of this gap, one side surface of the heat shield tube 9 corresponding thereto is formed to be longer by the distance l at the deepest portion.

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 blowing static pressure generated near the inlet of the nozzle 15 according to the air supply amount is guided into the liquid level regulator 23 via the bypass pipe 29, and the liquid fuel subjected to this static pressure is The fuel is pushed out through the supply pipe 26 and the thin tube 27 to the fuel supply port 28 at the tip thereof.

In addition, at this time, liquid fuel is sucked from the fuel supply port 28 by the high-speed airflow 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 airflow. The gas-liquid mixture is atomized and injected, collides with the inner wall of the vaporization chamber 20, that is, the vaporization surface, which has been preheated by the heater 18, and is vaporized by being spread and vaporized. The mixture is mixed with high-speed air and detoured through the flow holes of the baffle plate 21, resulting in further 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 Even if the combustion amount is simply changed by changing the air flow rate, the premix ratio of air and fuel remains approximately constant.

The hot combustion air (flame) at the flame port 32 hits the inner surface of the combustion tube 8 and is turned inward and tends to converge.
Head upwards.

Since the outside of the combustion tube 8 is surrounded by a heat shield tube 9 with a gap, the flame does not directly hit the inner wall of the combustion chamber, so thermal deformation and temperature rise of the outer shell of the main body are suppressed.

On the other hand, by operating the blower 13, air is blown from the air guide duct 31 into the air passage 4, and this 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, in other words, the air is constricted at the open port 5, so the flow velocity of the air blown out from the open port 5 increases. , this lowers the pressure in the iron part.

Therefore, the hot air is drawn into the air from the opening 5 and reaches the hot air discharge lower.

Secondary air enters the combustion tube 8 through the opening 38 to make combustion more complete, and air flows into the combustion tube 8 between the combustion tube and the heat shield tube through the air hole 37.

These airs flow from the opening 5 toward the discharge lower and follow the rise of the hot combustion air of the combustor 17, but are distributed accordingly by the gaps 40.

This incoming air assists the smooth rise of combustion hot air, mixes well with the blowing air, releases uniform hot air from the louver, and at the same time functions to suppress the temperature rise on the wall surface of the combustion chamber.

This device is particularly characterized by the combination of a heat shield tube 9 and a hot air guide plate 35, and the hot combustion air rising inside the combustion chamber is deflected when it hits the guide plate 35. Since the hot air reaches the hot air discharge lower, the temperature of the upper surface of the outer shell of the main body hardly rises, and both sides of this guide plate are connected to the heat shield tube 9.
By overlapping with a gap 36 on the outside of both sides, both sides of the upper part where heat is concentrated are double thermally insulated with an air gap, preventing thermal deformation of each part and temperature of the outer shell of the main body. It is safe because the rise is suppressed.

Also, by performing heat shielding and thermal insulation in this way,
Combustion heat is effectively released from the hot air discharge lower, increasing the heating effect.

The reason why only the side edges of the guide plate 35 are allowed to hang down is that the back part has the air passage 4 for cooling, and the front part is open to discharge hot air.

As described above, this idea surrounds the combustor by enclosing both sides of the guide plate, which is placed from the top surface of the open air passage formed on the back of the main body to the top surface of the hot air outlet provided on the front top of the main body. By hanging the heat shield cylinder on the outside of both sides of the upper part of the heat shield cylinder so as to overlap with the heat shield cylinder with a gap, the combustion heat can be efficiently released from the hot air outlet by the guide plate, and the heat shield can be efficiently released from the hot air outlet. Both sides of the upper part of the main unit, where heat is concentrated, are double thermally insulated with an air gap, which suppresses thermal deformation of each part and temperature rise outside the main unit, allowing safe and effective heating. It has the effect of

[Brief explanation of the drawing]

Figure 1 is a half-sectional front view showing one embodiment of this invention;
The figure is a simplified vertical cross-sectional view, Figure 3 is a simplified cross-sectional view showing the configuration of the combustion mechanism, Figure 4 is an enlarged front view of the vicinity of the combustion tube, Figure 5 is a cross-sectional view taken along line V-■ in Figure 4, FIG. 6 is a half-sectional rear view of the combustion tube and heat shield tube in an assembled state, and FIG. 7 is a front perspective view thereof. In the figure, 3 is the main body case, 4 is the air passage, 5 is its opening, 6
1 is a combustion chamber, 7 is a hot air outlet, 9 is a heat shield tube, 12 is a louver, 13 is a blower, 17 is a combustor, 22 is a flame port, 35 is a guide plate, and 36 is a space.

Claims (1)

[Scope of utility model registration request] A combustion chamber is formed in the main body and has a hot air outlet at the upper front of the main body, and a combustion chamber is formed at the back of the main body and the lower end communicates with the blower and the upper end is open to the upper part of the combustion chamber corresponding to the hot air outlet. an air passage, a combustor whose flame port is exposed at the lower part of the combustion chamber, a heat shield cylinder provided to surround the combustor and whose upper side ends extend to both sides of the open mouth of the air passage; A hot air guide plate is provided extending from the top surface of the open opening of the air passage to the top surface of the hot air discharge port, and both side edges of the guide plate are placed on the outside of both sides of the heat shield tube with a space therebetween. A hot-air heater characterized by hanging down so as to overlap each other.