JPH0423175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot air heater such as a fan heater.

BACKGROUND ART Conventionally, this type of hot air heater has a burner 2 in a main body 22 having a hot air outlet 21, as shown in FIG.
3 is provided, and a combustion tube 2 is provided so as to surround this burner 23.
4, and a fan 25 for supplying warm air around the combustion tube 24 is attached to the back of the main body 22, and the air from the fan 25 is combined with the combustion gas from the combustion tube 24. The mixture is mixed and then blown out from the hot air outlet 21. In order to improve the combustion characteristics of the burner 23, a large number of air supply holes 26 are formed in the lower part of the combustion tube 24, and a duct 27 is provided on the outer periphery of the lower part of the combustion tube so as to surround the through holes 26. A part of the air from the fan 25 is taken in through the opening 28 of the burner 27 to supply secondary air to the outer periphery of the burner 23.

Problems to be Solved by the Invention However, in the conventional configuration described above, all the secondary air taken in from the opening 28 enters the duct 27 and is supplied to the outer periphery of the burner 23 through the through hole 26. The amount of secondary air supplied will be determined by the size of the opening 28, ie, the duct 27. This amount of secondary air has a great effect on combustion performance, so it must be delicately adjusted. However, in the conventional configuration described above, the amount of secondary air is determined by the size of the duct 27, so this cannot be adjusted. There was a problem in that the size had to be slightly changed, making the design of the duct 27 difficult. In addition, when developing two types of burners 23 with different combustion amounts (different models), the amount of secondary air will differ depending on the combustion amount of each, so naturally the size of the duct 27 will also be different, so the size of each burner 23 will be different. There was also the problem of poor productivity, such as the need to use separate molds with different temperatures.

On the other hand, the burner 23 has a vaporization cylinder (not shown) that vaporizes liquid fuel into gas, but the temperature of this vaporization cylinder tends to vary slightly, and it is difficult to maintain the temperature as designed. Have difficulty. If the temperature of the vaporizer cylinder does not match the design, the combustion state will become unstable, and the hot air mixed with combustion gas and blown out will become dirty.

The present invention solves these problems all at once, and aims to make duct design easier, improve productivity, and easily manage the temperature of the vaporizing cylinder. It is something.

Means for Solving the Problems In order to achieve the above object, the present invention provides a hole for adjusting air volume near the air intake of the duct, and the vaporizing cylinder of the burner is arranged to face the lower part of the combustion cylinder.

Effects With the above-described configuration, the present invention makes it possible to change the amount of secondary air to the outer periphery of the burner in the combustion cylinder simply by increasing or decreasing the opening area of the air volume adjustment hole, and also to change the amount of secondary air to the outer periphery of the burner in the combustion cylinder. The temperature of the vaporizer can be subtly changed depending on the amount of air.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 is a main body having a hot air outlet 2 on the front side; 3 is a fan for supplying hot air provided on the back side of the main body 1;
4 is a wind cylinder that guides the air from the fan 3 to the hot air outlet 2; 5 is a burner provided with its combustion part facing inside the wind cylinder 4; as shown in FIG.
It consists of a vaporization cylinder 6 for vaporizing liquid fuel provided in a, and a burner head 7 covered on the vaporization cylinder 6. Reference numeral 8 denotes a combustion cylinder arranged so as to surround the outer periphery of the burner head 7, and has an opening 9 at the top and a through hole 10 for air intake formed around the entire circumference at the bottom. The vaporizing cylinder 6 of the burner 5 is arranged so that a part thereof faces into the combustion cylinder 8. Reference numeral 11 denotes a duct disposed on the outer periphery of the lower part of the combustion tube 8 so as to surround the through hole 10, and has an opening 12 on the side of the fan 3. The duct 11 has a plurality of holes 13 each having a small slit-like opening area for adjusting the air volume on both sides of the duct 11 near the opening 12 thereof. 14
15 is a thermistor embedded in the vaporizer cylinder 6, and 15 is a controller that stops combustion of the burner 5 when the temperature of the vaporizer cylinder 6 detected by the thermistor 14 falls below a predetermined temperature. In the figure, 16 is a nozzle that supplies liquid fuel to the vaporization cylinder 6, and 17 is a throat that supplies primary air for combustion.

In the above configuration, the air from the fan 3 mixes with the combustion gas from the burner 5 to become hot air, which is blown out from the hot air outlet 2. A portion of the air from the fan 3 enters the duct 11 through the opening 12 and is supplied to the outer periphery of the burner in the combustion tube 8 through the through hole 10 as secondary air.

At this time, a part of the air taken in through the opening flows out of the duct 11 through the air volume adjustment hole 13, and the rest enters the duct 11 and is used as secondary air. Therefore, this air volume adjustment hole 13
By changing only the size of the duct, the secondary air volume can be adjusted without changing the duct size, which simplifies the design and also allows for this air volume adjustment when developing other models with different combustion volumes. This can be done simply by changing the size of the hole 13. This air volume adjustment hole 13 may be of any shape, such as rectangular or round, as long as the air volume can be adjusted, and its size is the same for the mold used to process the entire duct, but only the hole forming part is changed. This makes it possible to facilitate processing and improve productivity.

On the other hand, the secondary air supplied from the inside of the duct 11 to the outer periphery of the burner in the combustion tube 8 through the through hole 10 flows to the outer periphery of the vaporization tube 6, which is partially exposed at the lower part of the inside of the combustion tube 8. The temperature of the vaporizer cylinder 6 is lowered by the heat exchanger. Therefore, as described above, by changing the size of the air volume adjustment hole 13 and changing the amount of secondary air, the temperature of the vaporizer cylinder 6 can be adjusted, and variations in the vaporizer cylinder temperature can be adequately coped with. be able to.

Further, if the air volume adjusting hole 13 is made to have a small opening area as in the embodiment, the following effects will also be exhibited. In other words, if dust is mixed in the air from fan 3, this dust will flow through the air volume adjustment hole 1.
3 and gradually closes this hole 13.
As a result, the wind taken into the duct 11 has no place to escape, and gradually all of this wind comes to be supplied to the outer periphery of the burner in the combustion tube 8 as secondary air. Then, as mentioned above, the temperature of the vaporizer cylinder 6 begins to decrease, and when the temperature falls below a predetermined temperature, the thermistor 14 detects this.
The controller 15 stops combustion of the burner 5 based on the signal from the burner 5. Therefore, the combustion of the burner 5 can be stopped before the dust blocks the secondary air supply hole 10 at the bottom of the combustion tube 8 and starts to cause incomplete combustion, improving safety. do.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, not only the design of the duct but also the processing thereof is facilitated, productivity is improved, and temperature variations in the vaporizing tube can be easily corrected. etc., the effects are great.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hot air heater according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is a sectional view of the hot air heater as seen from the side, and Fig. 4 is a conventional one. FIG. 2 is a sectional view showing a warm air heater. 1... Main body, 2... Warm air outlet, 5... Burner, 6... Vaporization tube, 8... Combustion tube, 10... Through hole, 11... Duct, 12... Opening, 13... Air volume adjustment Hole for, 15...Controller.

Claims (1)

[Scope of Claims] 1. A main body case having a hot air outlet, a burner provided in the main body case, a combustion tube with an upper opening surrounding the outer periphery of the burner, and a through hole provided in the lower part of the combustion tube, A duct is provided to surround the outer periphery of the through hole, and a fan for supplying hot air is provided. A hot air heater, wherein a plurality of holes for adjusting air volume are provided near the opening, and the burner has a vaporizing cylinder at least a part of which faces a lower part of the combustion cylinder. 2. Claim 1, which includes a hole for adjusting air volume having a small opening area, and a controller that detects the temperature of the vaporization cylinder and stops combustion of the burner when the temperature of the vaporization cylinder falls below a predetermined temperature. Hot air heater as described in section.