JPH0431495Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention relates to a hot air heater that can be connected to an exhaust stack, and more specifically, it can mix combustion gas with indoor convective air and release it indoors. I can and
The present invention also relates to a warm air heater that can be equipped with an exhaust pipe to discharge the air outdoors.

(Prior Art) A specific example of a conventional hot air heater that can be connected to an exhaust stack is the device described in Japanese Utility Model Application No. 58-69741. As shown in FIGS. 5 and 6, this hot air heater includes a convection fan 52 in the lower part of the main body casing 51, and a gasification burner 53 with a built-in combustion fan located slightly above the convection fan 52. Provided, this gasification burner 5
3, the oil fuel is vaporized, and the vaporized oil fuel and combustion air are mixed and burned in the combustion chamber 54. This combustion gas is transferred to heat exchanger 5.
5 and has a structure in which the combustion gas from the heat exchanger 55 is sent to the gas collecting section 56. Further, a connecting cylinder 57 for an exhaust pipe is attached to the upper part of the gas collecting portion 56, and an insertion hole 58 for the exhaust pipe is formed in the upper part of the main body casing 51.

When the hot air heater described above is used in a method in which combustion gas is mixed with indoor convective air and released into the room (hereinafter referred to as a fan heater method), as shown in FIG. is closed with a lid body 59, and the combustion gas sent out from the upper opening of the connecting cylinder body 57 is released from below the heat shield plate 60 to the side. Then, this combustion gas is mixed with the air sent by the convection fan 52 below in the main body casing 51, and is mixed with the air sent to the air outlet 6.
1,62 into the room.

On the other hand, in a method of exhausting combustion gas outdoors using an exhaust pipe (hereinafter referred to as an outdoor exhaust method), as shown in FIG. 6, an exhaust pipe 63 is inserted into the insertion hole 58, and the The cylinder 63 is attached to the connecting cylinder 57. In this case, heat exchanger 5
The combustion gas from 5 is discharged to the outside from the exhaust pipe 63 through the gas collecting part 56, and is also discharged from the convection fan 52.
The air sent around the heat exchanger 55 by the
2 is released into the room.

(Problem to be solved by the invention) By the way, when the hot air heater as described above is used in an outdoor exhaust system, the static pressure in the combustion chamber 54 decreases due to the draft action of the exhaust stack 63. This phenomenon occurs. For example, in the case of the fan heater method (Fig. 5), the combustion chamber (point A) has a diameter of 2.0 mm.
When a static pressure of 1.7 mm water column is generated in the water column and gas collecting section (point B), and 1.7 mm water column is generated inside the aircraft (point C), if the static pressure is used as is with the outdoor exhaust system (Figure 6), , the static pressure inside the machine (point C) is almost the same, but in the combustion chamber (point A) -0.5
~-0.6mm water column, -0.6 in the gas gathering part (point B)
Since the pressure decreases to a negative pressure of -0.7 mm water column, the amount of combustion air supplied by the combustion fan built into the gasification burner 53 increases. This causes a problem in that the combustion state changes. In other words, in the outdoor exhaust system, there is an excess of combustion air, leading to a decrease in thermal efficiency and unstable combustion.

Therefore, when using the above-mentioned warm air heater with an outdoor exhaust system, it is necessary to adjust the amount of combustion air, but it is extremely troublesome to perform this type of work every time the installation is performed. It is.

It is also possible to reduce the internal diameter of the exhaust pipe 63 to increase the flow resistance inside the cylinder and reduce the draft effect of the exhaust pipe 63, thereby solving the above problems. Cylinder installation work is carried out by determining the height empirically based on heating capacity, horizontal length, number of bends, inner diameter, etc., so it is necessary to make this type of adjustment for each installation location. It is also quite difficult to realize this measure because it is complicated and the diameter etc. of the exhaust pipe 63 to be used are limited by various regulations.

This idea was made in order to solve the above-mentioned conventional problems, and its purpose was to eliminate the need for adjusting the amount of combustion air or the flow resistance of the exhaust stack as described above. To provide an exhaust pipe connectable hot air heater that can make the combustion state substantially the same in both the use conditions and the outdoor exhaust method.

(Means for Solving the Problems) Therefore, in the exhaust stack connectable hot air heater of this invention, as shown in FIG. A flow resistance body 14 is disposed, and an outlet 15 is formed in the side portion 10 of the connecting cylinder 5 to allow the combustion gas to flow out into the casing 1. It is located at a position in front of the flow direction of the combustion gas, and at a position where it is closed by the exhaust pipe 6 when the exhaust pipe 6 is attached to the connecting cylinder 5.

According to the above, compared to the case where the combustion gas flows out into the casing 1 via the connecting cylinder 5,
The structure is such that the flow resistance applied to the combustion gas is greater when it flows out into the exhaust pipe 6 via the resistor 14 in the connecting cylinder 5.

(Function) As a result of the above, when this hot air heater is used in a fan heater type, the insertion hole 7 of the main body casing 1 is closed. Then, the combustion gas will be released into the casing 1 from the outlet 15 of the connecting cylinder 5.

On the other hand, when the warm air heater is used in an outdoor exhaust system, the resistance element 14 disposed within the connecting cylinder 5 imparts flow resistance to the combustion gas. Therefore, even if a fan heater system is used as an outdoor exhaust system, the static pressure inside the combustion chamber 2 and the gas collecting section 4 will not drop as in the past. Therefore, the combustion state does not change as much as in the conventional case. Further, at this time, since the outlet 15 provided in the connecting cylinder 5 is closed by the attached exhaust pipe 6, no combustion gas is released from the outlet 15 into the room.

(Example) Next, a specific example of the exhaust stack connectable hot air heater of this invention will be described in detail with reference to the drawings.

In FIG. 2, 1 indicates a main body casing, and inside this casing 1, although not shown,
Similar to the conventional device, a gasification burner with a built-in convection fan and a combustion fan is installed.The gasification burner vaporizes the oil fuel, mixes the vaporized oil fuel and combustion air, and creates a combustion chamber. It is designed to be burned within 2. The combustion gas from the combustion chamber 2 is sent to the gas collecting section 4 through the heat exchanger 3. An opening is formed in the center of the upper part of the gas collecting section 4, and the connecting cylinder 5 is attached to the peripheral edge of this opening. This connecting cylinder 5 is for attaching an exhaust pipe 6.
An insertion hole 7 through which an exhaust pipe 6 is inserted is provided in the main casing 1 at a position above the cylindrical body 5. A heat shield plate 8 is attached to the periphery of the insertion hole 7 in the casing 1, and an air outlet 9 is formed on the front side of the casing 1.

As shown in FIGS. 3 and 4, the connecting cylinder 5 has a cylindrical side portion 10 and a cylindrical side portion 10.
It has three strips 11...11 attached to the inner circumferential surface thereof at equal intervals in the circumferential direction. Each piece 11
Its lower part is bent radially outward at the lower end of the side part 10 and serves as a mounting leg part 12 for the gas collecting part 4, and its upper part is bent slightly upward in the side part 10. The mounting portion 13 is bent radially inward at the position shown in FIG.
A thin disk-shaped resistor 14 is fixed to the mounting portion 13. The diameter of this resistor 14 is slightly smaller than the inner diameter of the side portion 10, for example, in the case of the figure, it is formed to have a diameter of about 80% of the inner diameter of the side portion 10. In addition, the side portion 10 has
A combustion gas outlet 15 is formed at a lower position of the resistor 14, that is, at a position on this side with respect to the combustion gas outflow direction. This outlet 15 is
It is formed by cutting a cylindrical side part 10 into a square shape, and in the case of the figure, six outlet ports 15 are arranged at equal intervals in the circumferential direction. The dimensions of each part above are based on heating capacity, for example.
In a 15000Kcal/h hot air heater, side 1
The inner diameter of the resistor 14 is 103.8 mm, the outer diameter of the resistor 14 is 80 mm,
In addition, the dimension of one of the above-mentioned outlet ports 15 is the width in the vertical direction.
12mm, unfolded length 34mm.

When the hot air heater described above is used in a fan heater type, the insertion hole 7 of the main body casing 1 is closed with a cover 16 having heat insulating properties, as shown on the left side of FIG. Then, the combustion gas in the gas collecting part 4 is blown out between the inner peripheral surface of the side part 10 of the connecting cylinder 5 and the outer periphery of the resistor 14 and from the outlet 15, and is blown out from the lower side of the heat shield plate 8 to the sides. It's blown out.
This combustion gas is mixed well with convection air from a convection fan (not shown) within the main body casing 1, and is discharged into the room from the outlet 9. In this case, since the resistor 14 is disposed inside the connecting cylinder 5, the flow resistance to the combustion gas increases in this part compared to the conventional case. Since it is provided, the combustion gas is also blown out from this outlet 15, and the overall flow resistance is almost the same as that of the conventional one. Therefore, the combustion state within the combustion chamber 2 is also substantially the same as in the conventional case.

On the other hand, when using the hot air heater with an outdoor exhaust system, as shown on the right side of FIG. Connect the lower end to the side 1 of the cylinder 5
Attach it to the outer circumference of 0. At this time, the outlet 15 provided in the side part 10 is closed by the exhaust pipe 6, and the combustion gas from the gas collecting part 4 is transferred to the connecting cylinder 5.
It passes around the resistor 14 in the side part 10 of the exhaust pipe 6 and is discharged to the outside. Convection air from a convection fan (not shown) is heated in the heat exchanger 3 and discharged into the room from the outlet 9. In this case, the flow resistance is imparted to the combustion gas discharged from the exhaust stack 6 to the outside by the resistor 14, and as a result, the combustion chamber 2 and the gas collecting section 4 are drafted by the exhaust stack 6. This means that it is hardly affected by the action. For this reason, even if the fan heater type used as described above is used as it is as an outdoor exhaust type, the static pressure in the combustion chamber 2 and gas collecting part 4 will not reach negative pressure as in the conventional case. Therefore, the combustion state in the combustion chamber 2 is approximately the same as in the case of the fan heater method.

As described above, according to the warm air heater, the combustion state in the combustion chamber 2 can be made the same both when using the fan heater method and when using the outdoor exhaust method. There is no need to adjust the amount of combustion air depending on the usage conditions as in the past. Further, when using the fan heater method as described above, a gap is provided between the upper end of the connecting cylinder 5 and the heat shield plate 8, and a gap is provided between the upper end of the connecting cylinder 5 and the heat shield plate 8, and a gap is provided along the circumferential direction of the side part 10 of the connecting cylinder 5. By arranging the plurality of outlet ports 15...15 in a distributed manner, the combustion gas is released into the casing 1 from both the upper opening of the connecting cylinder 5 and the outlet port 15, so that the convection air from the convection fan is released. The temperature of the blown gas blown into the room can be made even more uniform.

Although one embodiment of the exhaust stack connectable hot air heater of this invention has been described above, the hot air heater of this invention is not limited to the above embodiment, and can be implemented with various modifications. is possible. For example, in the above description, a thin disc-shaped resistor 14 is used, but this shape and its support structure are not particularly limited to the above. Further, in the above example, the gap between the upper end of the connecting cylinder 5 and the heat shield plate 8 is also used as a combustion gas blowout opening in the fan heater method, but the gap may be eliminated.
Furthermore, a plurality of outlet ports 15 are provided on the side portion 10 of the connecting cylinder 5.
Although an example is shown in which 15 outlets are provided, it is of course possible to provide only one large outlet.

(Effect of the invention) In the hot air heater that can be connected to the exhaust pipe of this invention, as described above, a resistor that acts as a flow resistance for combustion gas is placed inside the connecting cylinder, so that the hot air It is possible to reduce the influence of the draft effect of the exhaust stack on the combustion chamber when the heater is used in an outdoor exhaust system. Therefore, regardless of whether this hot air heater is used with a fan heater method or an outdoor exhaust method, the combustion state in the combustion chamber can be made almost the same, and therefore the amount of combustion air can be reduced as compared to conventional methods. There is no need to make any adjustments.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the main parts of an embodiment of the hot air heater of this invention, Fig. 2 is a schematic diagram of the whole,
FIG. 3 is a plan view of the connecting cylinder used in the above;
FIG. 4 is a longitudinal sectional view thereof, FIG. 5 is a longitudinal sectional view when the conventional example is used in a fan heater system, and FIG. 6 is a longitudinal sectional view when the above is used in an outdoor exhaust system. 1... Main body casing, 4... Gas collecting part, 5
... Connection cylinder, 6 ... Exhaust pipe, 7 ... Insertion hole, 1
0... Side part, 14... Resistor, 15... Outlet.

Claims (1)

[Scope of utility model registration request] A connecting cylinder 5 is attached to the combustion gas collecting part 4 in the main body casing 1, which communicates the collecting part 4 with the exhaust pipe 6, and an insertion hole 7 through which the exhaust pipe 6 is inserted is openable and closable in the main body casing 1. In the exhaust pipe connectable hot air heater, a resistance element 14 against the flow of combustion gas is disposed inside the connecting cylinder 5, and a resistance body 14 against the flow of combustion gas is disposed inside the connecting cylinder 5, and a side part 10 of the connecting cylinder 5 has a resistance body 14 arranged inside the casing 1. An outlet 15 is formed for letting the combustion gas flow out, and the outlet 15 is located at a position closer to the flow direction of the combustion gas than the resistor 14,
In addition, when the exhaust pipe 6 is attached to the connecting cylinder 5, it is placed in a position where it is closed by the exhaust pipe 6, so that the combustion gas flows out into the casing 1 via the connecting cylinder 5. than when
An exhaust pipe connectable type characterized in that the flow resistance given to the combustion gas is greater when it flows out to the exhaust pipe 6 via the resistor 14 in the connecting cylinder 5. Hot air heater.