JPS5852444Y2 - hot air heater - Google Patents

Description

[Detailed description of the invention] This invention relates to a hot-air heater that uses combustion heat, and aims to provide safe and effective heating and to make the whole device compact.

In this type of hot air heater that uses combustion heat, if the wind speed from the blower that sends out hot air is not uniform, the hot air released from a part of the louver will be cold air from one end and cold air from the other end. Since the hot air is emitted in a concentrated manner, it causes a local temperature rise, which is not only extremely dangerous, but also causes problems such as poor heating effects.

In order to equalize the temperature of the hot air emitted from a part of the louver, this idea is based on the shape of the open opening corresponding to the combustion tube of the air passage that guides the air from the blower, with a large cross-sectional area on the upstream side and a cross-sectional area on the downstream side. They are formed so that their areas overlap to equalize the speed of air discharged from the open mouth of the air passage.

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 this opening 'D5 is said to be smaller than that of the air passage 4.

Reference numeral 7 indicates a warm air discharge port opened at the upper front of the main body case 3 in correspondence with the opening 5, 8 indicates a rectangular combustion tube with an open top surface provided in the combustion chamber 6, and 9 indicates a front surface of the combustion tube. and a flame-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 of which penetrates into the air supply pipe 14 near the nozzle 15, and the other end of which is a thin tube 27, and the heating material at the tip thereof is connected. The supply port 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 guide plate installed horizontally in 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 its both sides are heat shielded. Cylinder 9. They hang down on the outside of both sides of the iron parts and overlap each other with a spacing of 36.

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 denotes an open part formed by cutting out the front surface of the upper part of the heat shield plate 9 in correspondence with the opening 5 of the air passage, so as not to obstruct the air blown from the opening 5 from reaching the hot air discharge lower. There is.

Reference numeral 42 denotes a bent portion formed by folding the end portions of both side surfaces of the heat shielding tube 9 outward.

The upper part of the outer edge of this new curved part is located at the inner edge of the hanging part on both sides of the guide plate 35, and the inner surface of the upper part of both sides of the heat shield tube 9 corresponding thereto is located at the outer edge on 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.

Therefore, the arrangement of each part within the main body 3 is such that the combustor 17,
The combustion tube 8, the heat shield tube 9, the air passage opening 5, etc. are located in the center.
In addition, the fuel tank T, liquid level regulator 23, etc. are biased to one side, and the blower 13 is biased to the other side, thereby making the entire structure thin and compact.

Therefore, the air passage 4 is disposed obliquely from the side to the opening 5 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 from the opening 5 at a substantially right angle 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, 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 out, thereby vaporizing the vaporized fuel and the nozzle 15. The mixture is mixed with 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 This can be done simply by changing the air flow rate, and the premixing ratio of air and fuel remains approximately constant even if the combustion amount is changed.

The hot combustion air (flame) at the flame port 22 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 at a distance, the flame does not directly hit the inner wall of the combustion chamber, thereby suppressing thermal deformation and temperature rise in the middle part of the main body.

On the other hand, when the blower 13 is operated, air is blown into the air passage 4 through the air guide duct 31, 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.

The air blowing from the opening 5 toward the discharge lower flows in a uniformly distributed manner due to the change in the cross-sectional area A. However, because the cross-sectional area at the end of the air passage 4 in the air blowing direction is reduced in this way, The outer surface of the main body tends to be affected by combustion heat such as conduction heat from the guide plate 35 and the heat shield tube 9 and heat radiation from the combustion tube 8.

Therefore, by forming the void B commensurate with the degree of thermal influence, thermal relaxation is achieved and the influence is kept to a minimum.

The illustrated embodiment has been described in detail above, but this invention is a hot air heater that releases combustion heat by blowing air, and in particular, it is equipped with a combustion tube that raises the combustion hot air to the upper part of the combustion chamber.
In addition to suppressing the abnormal rise of the flame, the hot air can be effectively released for heating purposes.Furthermore, since the flame does not directly hit the inner wall of the combustion chamber, the rise in the outer shell temperature is also suppressed. The cross-sectional area of the passage is reduced in the air blowing direction to make air blowing uniform, and a gap is provided between the combustion tube and the air gap that widens in the opposite direction to the cross-sectional area to further suppress the rise in the temperature of the outer shell of the main body. It can be easily formed by simply installing the combustion tube, and since the blower is installed offset within the main body, the entire body is thin, making it safe and effective for heating.
We can also provide a compact warm air heater.

[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 interception of the combustion mechanism, Figure 4 is an enlarged front view of the vicinity of the combustion cylinder, Figure 5 is a cross-sectional view taken from line V to 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, 12 is a louver, 13 is a blower, 17 is a combustor, 22 is a flame port, 8 is a combustion tube, and B is a gap.

Claims (1)

[Scope of utility model registration request] A combustion chamber is formed inside the main body and has a hot air outlet at the upper front of the combustion chamber, and the combustion chamber is formed at the back of the main body and communicates with a blower installed with the lower end offset to one side of the main body, and the upper end is connected to the hot air outlet. Correspondingly, there is an air passage opened at the upper part of the combustion chamber, a combustor whose flame port is exposed at the lower part of the combustion chamber, and a combustor which is provided so as to surround this combustor and whose rear part faces a part of the air passage. A combustion tube with an open top surface is provided, and the cross-sectional area of the air passage corresponding to the combustion tube is gradually reduced in the air blowing direction, and a gap is formed between the cross-sectional area and the back surface of the combustion tube, and the cross-sectional area is the same as the track bed. A warm air heater.