JP6849538B2 - Hot air heater - Google Patents

Description

The present invention relates to a hot air heater that heats by mixing combustion gas generated by combustion of fuel such as kerosene and blowing air and blowing the air as warm air.

Conventionally, in this type of combustion cylinder, a secondary air inlet is formed at the lower part of the back surface of the combustion cylinder, and a part of the air blown from the convection fan is introduced into the combustion cylinder as secondary air from the secondary air inlet. Was supplying. (See, for example, Patent Document 1.)

Therefore, in order to increase the amount of combustion, it is necessary to increase the amount of secondary air supplied into the combustion cylinder, and increasing the amount of secondary air inlet to increase the amount of secondary air increases the maximum amount of combustion. However, if the amount of combustion is smaller than the maximum amount of combustion, the amount of secondary air supplied into the combustion cylinder from the secondary air inlet becomes excessive, the combustion cylinder is cooled, the temperature drops, and the burner head forms it. There is a drawback that the combustion temperature drops because the flame is blown by the increased secondary air, which increases the CO in the combustion gas.

Therefore, the applicant forms a secondary air inlet at the lower part of the back surface of the combustion cylinder, and covers the secondary air inlet at a position outside the combustion cylinder from the secondary air inlet on the combustion cylinder substrate. He invented an erected board. (See, for example, Patent Document 2.)

JP 2006-84124 JP-A-2009-85561

By the way, in this conventional one, when the minimum combustion amount is reduced, the flame becomes smaller, and the secondary air passing through the inlet shielding plate hits the flame to lower the combustion temperature, which causes CO in the combustion gas. There was a drawback that the number increased.

If the flame is small, the secondary air that has passed through the inlet shielding plate directly hits the ignition electrode provided in the combustion cylinder to lower the temperature of the ignition electrode, and the flame touches the lowered ignition electrode. There is a drawback that the combustion temperature drops, which increases the CO in the combustion gas.

In order to solve the above problems, in claim 1 of the present invention, a bottomed cylindrical vaporization cylinder, a burner head provided above the vaporization cylinder, a combustion cylinder covering the burner head, and the combustion cylinder. In a hot air heater provided with a convection fan composed of a propeller fan provided at the rear and having a secondary air introduction port formed in the lower part of the back surface of the combustion cylinder, a hollow disk-shaped bottom plate portion and the bottom plate portion A bottom plate rectifying plate having a leg portion formed on the circumferential portion is provided in the combustion cylinder so as to be located between the secondary air introduction port and the burner head on the circumferential portion of the bottom plate rectifying plate. A tongue-shaped ventilation resistance portion is provided downward.

Further, in claim 2, the secondary air injection port opens in the oblique direction of the inflowing secondary air to allow air to easily enter the first secondary air injection port, and the inflowing secondary air is oblique. It consists of a second secondary air injection port that opens in a direction different from the direction and makes it difficult for air to enter, and the second secondary air injection port is formed larger than the first secondary air introduction port. The ventilation resistance portion is provided at a position inside the combustion cylinder of the first secondary air injection port .

Further, in claim 3, the bottom plate rectifying plate is provided so as to vertically divide the opening portion of the second secondary air introduction port with respect to the second secondary air introduction port .

Further, in claim 4, the side where the flow resistance unit is provided in the frame rod for detecting the state of the spark plug and the flame ignites the premixed gas spewing from the burner head and the first secondary air introduction port It is the one that was placed.

According to claim 1 of the present invention, since a bottom plate rectifying plate having a hollow disk-shaped bottom plate portion and a leg portion formed on the circumferential portion of the bottom plate portion is provided in the combustion cylinder, the bottom plate rectifying plate is provided. The bottom plate of the unit prevents all the air that has flowed into the combustion cylinder from the secondary air inlet from rising immediately, and allows some of the air that has flowed into the combustion cylinder to reach the burner headring. Is.

In addition, since a tongue-shaped ventilation resistance portion is provided downward so as to be located between the secondary air inlet and the burner head on the circumferential portion of the bottom plate rectifying plate, the outer cylinder bottom plate can be attached as in the conventional case. By partially cutting up the surface to form a ventilation resistance part, it is possible to prevent the air flowing into the combustion cylinder from flowing below the bottom plate of the outer cylinder, and there is a gap between the ventilation resistance part and the mounting surface. Is formed, and a part of the air flowing in from there reaches the burner head ring, so that the amount of air reaching the burner head ring does not decrease only where the ventilation resistance part is located. A stable flame is formed.

Further, according to claim 2, the secondary air introduction port is a first secondary air introduction port that opens in the oblique direction of the inflowing secondary air so that air can easily enter, and the inflowing secondary air. It consists of a second secondary air inlet that opens in a direction different from the oblique direction and makes it difficult for air to enter, and the second secondary air inlet is formed larger than the first secondary air inlet. At the same time, since the ventilation resistance portion is provided at the position inside the combustion cylinder of the first secondary air introduction port, the secondary air flowing obliquely from the back surface due to the characteristics of the propeller fan which is a convection fan. Inflows more into the oblique opening of the air in the secondary air inlet, and less into the opening in the non-oblique direction of the air in the secondary air inlet, so the air is skewed. A large amount of secondary air that is about to flow into the opening of the secondary air inlet that opens in the direction collides with the ventilation resistance, making the air that flows into the secondary air inlet uniform and the amount of air that flows in. It is possible to prevent the flame from becoming unstable due to non-uniformity.

Further, according to claim 3, the bottom plate rectifying plate is provided so as to vertically divide the opening portion of the second secondary air introduction port with respect to the second secondary air introduction port. A part of the air flowing in from the secondary air inlet of No. 2 flows above the bottom plate rectifying plate and balances with the air flowing in from below the bottom plate rectifying plate to form a stable flame. ..

Further, according to claim 4, wherein the airflow resistance of the flame rod for detecting the state of the spark plug and the flame ignites the premixed gas spewing from the burner head and the first secondary air inlet was provided Since it is arranged on the side, when the amount of combustion is small, the secondary air flowing in from the first secondary air inlet collides with the ventilation resistance portion and flows to the left, right, or above of the ventilation resistance portion.
As a result, the secondary air flowing in from the first secondary air injection port provided with the ventilation resistance part hits the spark plug and frame rod arranged near the first secondary air introduction port, and the spark plug and frame rod are pressed. It is possible to prevent the flame formed in the flame hole of the burner head from coming into contact with the cold spark plug and the frame rod without cooling, and the combustion temperature is lowered to increase the generation of CO.

The schematic sectional view of the hot air heater which shows one Embodiment of this invention. Rear view of the air blower box. An exploded perspective view of the blower box and the burner section. Cross-sectional view of the combustion cylinder with the burner attached. A perspective view of the bottom plate rectifying plate. A perspective view of a main part near the resistance part in the same assembled state.

Next, an embodiment of the present invention will be described with reference to the drawings.
1 is the main body of the hot air heater, 2 is the operation unit provided in the upper part of the front surface, 3 is the hot air outlet equipped with the louver 4 for guiding the hot air, and 5 is the fan guard 7 at the hot air intake port 6 on the back surface. A convection fan composed of a propeller fan attached via the above, 8 is a blower box that communicates the warm air inlet 6 and the warm air outlet 3, and the exterior body of the device body 1 is a front panel 9 that covers the front surface. The upper surface plate 10 covering the upper surface and the back plate 11 covering the side surface and the back surface are fixed on the stand 12.

Reference numeral 13 denotes a bottomed cylindrical vaporization cylinder, in which a sheathed heater 14 is embedded as a heating means for heating the inside thereof to a vaporizable temperature of the fuel, and the vaporized fuel and combustion air are premixed and premixed. It is something to worry about.

Reference numeral 15 denotes a nozzle holder, which is provided with a combustion air port 16 for supplying combustion air and a secondary air port 16 for supplying secondary air in the vaporization cylinder 13, and the combustion air port 16 is provided. A fuel supply nozzle (not shown) for ejecting fuel is provided inside, and the combustion air port 16 is provided at an insertion port (not shown) formed below the side wall of the vaporization cylinder 13. It is inserted and fixed, and the fuel supply nozzle faces the inside of the vaporization cylinder 13.
Reference numeral 17 denotes a combustion fan, which supplies combustion air to the combustion air port 16.

Reference numeral 18 denotes a burner mounting base, and a ventilation hole 20 is formed substantially in the center of the plate-shaped mounting surface 19.
Reference numeral 21 denotes a bottomed cylindrical heater cover, which is screwed (not shown) to the burner mounting base 18 so that the vaporization cylinder 13 is installed internally and the opening portion thereof is located below the ventilation hole 20 of the burner mounting base 18. Further, a pot packing (not shown) is interposed between the vaporization cylinder 13 and the burner mounting base 18 to bring them into close contact with each other.
Further, on the bottom surface of the heater cover 21, a pot thermistor (not shown) screwed into the vaporization cylinder 13 to detect the temperature inside the vaporization cylinder 13 is fixed, and a burner for detecting abnormal overheating inside the vaporization cylinder 13 is further fixed. The thermostat (not shown) is fixed with screws (not shown).

Reference numeral 22 denotes a bottomed cylindrical burner head, which is arranged on the upper part of the ventilation holes 20 of the burner mounting base 18 with the bottom side facing up, and a plurality of flame holes 23 are formed on the peripheral wall thereof at substantially equal intervals. On the inner and outer circumferences of the flame hole 23, an inner perforated member (not shown) made of a tubular wire mesh and an outer perimeter porous member 24 are stretched so as to cover the flame hole 23, and a burner. It is arranged so as to be located above the ventilation hole 20 of the mounting base 18.

Reference numeral 25 denotes a burner head ring, which is arranged so as to cover the flame hole 23 in a ring shape from below the periphery of the burner head 22, and is fixed to the burner mounting base 18 together with the burner head 22 with screws (not shown). It is heated by the flame formed in the flame hole 23 of the burner head 22, and even if it is not heated by the sheathed heater 14, the vaporization cylinder 13 is kept at the vaporizable temperature of the fuel, that is, so-called heat back is taken.

Reference numeral 26 denotes an ignition plug that ignites the premixture ejected from the burner head 22, and 27 is a frame rod that detects the state of flame. Both the spark plug 26 and the frame rod 27 have their tips in the vicinity of the flame hole 23 of the burner head 22. It is provided so as to be located.

Reference numeral 28 denotes an outer cylinder bottom plate, and a ventilation hole 30 is formed substantially in the center of the plate-shaped mounting surface 29.
Reference numeral 31 denotes a bottom plate rectifying plate, in which a plurality of leg portions 33 are formed at substantially equal intervals on the circumferential portion of the hollow disk-shaped bottom plate portion 32, and an insertion portion 34 provided at the tip of the leg portion 33 is inserted into the outer cylinder bottom plate 28. It is fixed to the outer cylinder bottom plate 28 by inserting it into an insertion hole (not shown) formed around the ventilation hole 30 and bending it.

Reference numeral 35 denotes a hollow cylindrical combustion cylinder provided on the outer cylinder bottom plate 28, which is provided so that the ventilation hole 30 of the outer cylinder bottom plate 28 and the bottom plate rectifying plate 31 are located inside the cylinder, and the lower part of the back surface is viewed from the front. The first secondary air inlet 36 is formed on the right side from the center of the back, that is, on the spark plug 26 and the frame rod 27 side, and the first secondary air is introduced on the left side from the center of the back when viewed from the front, that is, when viewed from the front. A second secondary air inlet 37 is formed on the left side of the port 36.

The bottom plate portion 32 of the bottom plate rectifying plate 31 prevents all the air flowing into the combustion cylinder 35 from the first secondary air introduction port 36 and the second secondary air introduction port 37 from rising immediately. A part of the air flowing into the combustion cylinder 35 reaches the burner head ring 25, and the bottom plate rectifying plate 31 is the second secondary with respect to the second secondary air introduction port 37. Since the opening portion of the air introduction port 37 is provided so as to be divided into upper and lower parts, a part of the air flowing in from the second secondary air introduction port 37 flows above the bottom plate rectifying plate 31 to rectify the bottom plate. It is provided so as to form a stable flame in balance with the air flowing in from below the plate 31.

Further, a tongue-shaped ventilation resistance portion 38 is formed downward on the circumferential portion of the bottom plate rectifying plate 31, and is located between the first secondary air introduction port 36 of the combustion cylinder 35 and the burner head 22. To do.
Further, the second secondary air introduction port 37 is formed larger than the first secondary air introduction port 36.

By forming the ventilation resistance portion 38 downward on the circumferential portion of the bottom plate rectifying plate 31, the ventilation resistance portion 38 is formed by partially cutting up the mounting surface 29 of the outer cylinder bottom plate 28 as in the conventional case. By forming the air, it is possible to prevent the air flowing into the combustion cylinder 35 from flowing below the outer cylinder bottom plate 28, and a gap is formed between the ventilation resistance portion 38 and the mounting surface 29, and the air flows in from there. Since a part of the air that has been generated reaches the burner head ring 25, the amount of air that reaches the burner head ring 25 does not decrease only where the ventilation resistance portion 38 is located, so that a stable flame is generated. It is what is formed.

This is because the air that flows into the hot air heater main body 1 by the convection fan 5 flows diagonally to the left from the back to the front of the hot air heater main body 1 due to the influence of the rotation of the blades of the convection fan 5. The first secondary air inlet 36 formed on the right side from the center of the back when viewed from the front allows air to easily enter, and the second secondary air inlet 37 formed on the left side from the center of the back when viewed from the front Since it is difficult for air to enter, the second secondary air introduction port 37, which is difficult for air to enter, is formed larger than the first secondary air introduction port 36, which is easy for air to enter.

Reference numeral 39 denotes a hollow disk-shaped flame cylinder cover, which is provided above the combustion cylinder 35.
Reference numeral 40 denotes a blower box, which has a U-shaped cross section composed of left and right side surface portions 41 and 42 and a top plate portion 43 on a bottom plate rectifying plate 31 to which a combustion cylinder 35 to which a flame cylinder cover 39 of an outer cylinder bottom plate 28 is fixed is attached. A blower box cover portion 44 is attached, and the front and back surfaces of the blower box 40 are open, and the blower inflow portion (not shown) into which the blower from the warm air intake 6 flows into the back surface. A blower outflow portion 45 for flowing out warm air to the warm air outlet 3 is formed on the front surface.

Next, the operation of this hot air heater will be described.
First, when the operation switch (not shown) of the operation unit 2 is turned on, the control unit (not shown) performs an ignition operation to start combustion, and when ignition is detected by the frame rod 27, the ignition operation is performed. The control unit controls the combustion amount by the temperature difference between the detected room temperature and the set temperature set by the operation unit 2.

Therefore, when the amount of combustion is large, there is a large amount of fuel oil supplied from the fuel supply nozzle into the vaporization cylinder 13 and combustion air supplied from the combustion fan 17 into the vaporization cylinder 13, and the convection fan 5 is used to supply the hot air heater body. Therefore, a large amount of air flows into the combustion cylinder 35, and therefore a large amount of secondary air also flows into the first secondary air introduction port 36 and the second secondary air introduction port 37 at the lower part of the back surface of the combustion cylinder 35.

At this time, since the air flowing into the hot air heater main body 1 flows diagonally from the left side when viewed from the back surface of the hot air heater main body 1, the first first formed from the center of the back surface to the right side when viewed from the front. Air can easily enter the secondary air injection port 36, but since the ventilation resistance portion 38 of the bottom plate rectifying plate 31 is located between the first secondary air introduction port 36 and the burner head 22, the first secondary air inlet 36 It acts as a resistance to the secondary air that is about to flow into the secondary air introduction port 36, and prevents a large amount of air that is more than necessary from flowing in from the first secondary air introduction port 36.

As a result, the amount of inflow air of the first secondary air introduction port 36 where air easily enters and the amount of inflow air of the second secondary air introduction port 37 where air does not easily enter are balanced, and the periphery of the burner head 22. A flame is formed uniformly in the air, and the combustion temperature rises due to the lack of secondary air amount, which prevents the generation of nitrogen oxides from increasing and the amount of secondary air exceeds the required amount. As a result, the combustion cylinder 35 is cooled, the combustion temperature is lowered, and it is possible to prevent the generation of CO from increasing.

Further, when the temperature difference between the detected room temperature and the set temperature set by the operation unit 2 becomes small and the combustion amount becomes small, the fuel oil supplied from the fuel supply nozzle into the vaporization cylinder 13 or the vaporization cylinder from the combustion fan 17 The amount of combustion air supplied into the combustion cylinder 13 is small, and the amount of air flowing into the hot air heater main body 1 by the convection fan 5 is also small. A small amount of secondary air also flows into the secondary air introduction port 37 of 2.

At this time, the secondary air flowing in from the first secondary air introduction port 36 is the ventilation resistance portion 38 of the bottom plate rectifying plate 31 located near the burner head 22 of the first secondary air introduction port 36. Collides with and flows to the left, right, or above of the resistance portion 38.

As a result, the secondary air flowing in from the first secondary air injection port 36 hits the spark plug 26 and the frame rod 27 arranged near the first secondary air introduction port 36 to cool the spark plug 26 and the frame rod 27. It is possible to prevent the cold spark plug 26 and the frame rod 27 from coming into contact with the flame formed in the flame hole 23 of the burner head 22 to lower the combustion temperature and increase the generation of CO.

In this embodiment, the first secondary air injection port 36 and the second secondary air injection port 37 are provided in the lower part of the back surface of the combustion cylinder 35, but the present invention is not limited to this, and the combustion cylinder 35 is horizontally long in the lower part of the back surface. One secondary air injection port may be formed, and a ventilation resistance portion 38 may be provided on the side of the spark plug 26 and the frame rod 27 of the secondary air introduction port.

5 Convection fan 13 Vaporization cylinder 22 Burner head 35 Combustion cylinder 36 First secondary air inlet 37 Second secondary air inlet 38 Ventilation resistance

Claims (4)

A convection fan including a bottomed cylindrical vaporization cylinder, a burner head provided above the vaporization cylinder, a combustion cylinder covering the burner head, and a propeller fan provided at the rear of the combustion cylinder is provided. In a hot air heater in which a secondary air inlet is formed in the lower part of the back surface of the combustion cylinder, a bottom plate rectifying plate having a hollow disk-shaped bottom plate and legs formed in the circumference of the bottom plate is provided. It is characterized in that it is provided in the combustion cylinder, and a tongue-shaped ventilation resistance portion is provided downward so as to be located between the secondary air introduction port and the burner head on the circumferential portion of the bottom plate rectifying plate. Hot air heater. The secondary air injection port opens in a direction different from the oblique direction of the inflowing secondary air and the first secondary air injection port that opens in the oblique direction of the inflowing secondary air and allows air to easily enter. The second secondary air injection port is formed to be larger than the first secondary air introduction port, and the ventilation resistance portion is formed as described above. The hot air heater according to claim 1, wherein the hot air heater is provided at a position inside the combustion cylinder of the first secondary air injection port. The warm air according to claim 2 , wherein the bottom plate rectifying plate is provided so as to vertically divide the opening portion of the second secondary air introduction port with respect to the second secondary air introduction port. heater. Characterized in that arranged on the side of the ventilation resistance portion is provided in said frame rod for detecting the state of the spark plug and the flame to ignite the spewing premixed gas from the burner head first secondary air inlet The hot air heater according to claim 3.

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