JPH027402Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to a hot air heater that is used in general households and exhausts the air indoors.

<Prior art> Conventionally, this type of hot air heater has been equipped with a combustion tube that covers the outer periphery of the flame opening at the top of the combustor to prevent thermal effects on the combustion chamber wall and hot air fan, for example. This is already known from Publication of Utility Model Publication No. 14670/1983.

<Problems to be solved by the invention> In recent years, hot-air heaters have become more and more compact, while the calorific value or thermal power has increased, so the above-mentioned heat shield cannot be achieved with just the combustion tube. The effect is impossible, so it is necessary to increase the thickness of the plate,
Or, it is necessary to apply special insulation treatment, etc.
This method has disadvantages such as increasing the size, weight, and price of the hot air heater.

<Means for solving the problems> In order to solve the above problems, this invention has a combustion system that covers the outer periphery of the flame port at the top of the combustor, is open upward, and has a supply hole for secondary combustion air in the lower peripheral wall. In a hot air heater that includes a cylinder and releases combustion heat generated at the flame opening directly into the room by blowing air from a hot air fan,
An air flow passage is formed on the outer periphery of the combustion cylinder, and a heat shielding cylinder is provided, and the upper end of the heat shielding cylinder has a wind shielding wall that is higher than the front end, covering more than half of the rear hot air fan, and further providing heat insulation. This relates to a hot air heater characterized in that a combustion tube is located at a different position from a supply hole and a secondary air passage opening is opened on the rear side at the bottom of the tube.

<Operation> When the combustor 1 is combusted and the hot air fan 12 is driven, the combustion heat rising inside the combustion tube 6 is combined with the air blown from the hot air fan 12 above the combustion tube 6, and Pulled by the blowing force, the hot air is released into the room from the outlet 16 at the lower front of the main body frame 4,
This system effectively heats the room from below.

At the same time, part of the air blown by the hot air fan 12 is
As shown by the arrow a in the figure, while cooling the outer wall surface of the heat shield cylinder 8, the air flows into the air flow passage 9 forcefully from the rear secondary air passage port 11, and a part of the air collides with the combustion cylinder 6. The air is divided into two parts, one part rising in the airflow passage 9 and the other part falling, and is uniformly supplied to the flame port 3 as secondary combustion air through the supply holes 7 at different height positions.

<Example> 1 vaporizes fuel heated and supplied by a heating means (not shown), premixes this vaporized gas with combustion air supplied by a combustion fan 2, and burns the upper net. This is a combustor that performs combustion through a flame port 3 formed with a flame port 3, and is fixed to a partition plate 5 within a main body frame 4 with the flame port 3 protruding.

Reference numeral 6 denotes an upwardly open combustion tube that covers the outer periphery of the flame port 3 on the partition plate 5, and a plurality of supply holes 7 for supplying secondary combustion air to the flame port 3 is provided in the lower peripheral wall.

Reference numeral 8 designates a heat shielding tube with an open top provided to cover the outer periphery of the combustion tube 6, and forms a small air flow path 9 between the combustion tube 6 and the combustion tube 6 through which air always flows. In addition, the upper end of the rear radius side is equipped with a wind shield wall 10 that rises upward, and the lower rear side is equipped with a ventilation hole for secondary air circulation. 11 is located at a different height from the supply hole 7 of the combustion tube 6, and 12 is a main body frame 4 facing the rear side of the heat shield tube 8 behind the combustion chamber 13 provided with the combustion tube 6 and the heat shield tube 8. A propeller-type hot air fan provided on the back side of the housing and covered at least half by the heat shielding tube 8, which is used for mounting the cover body 1.
Indoor air is sucked in through the suction hole 15 formed in 4 and discharged forward, where it merges with the hot air generated by combustion through the combustion chamber 13, and is guided by the wall of the combustion chamber 13 while being pulled by the blowing force. , the hot air is discharged into the room as warm air from the hot air outlet 16 at the lower front of the main body frame 4, thereby heating the room.

At the same time, a part of the air blown by the warm air fan 12 flows into the air flow passage 9 through the secondary air circulation port 11 of the heat shield cylinder 8, and furthermore, a part of the air blown is divided and flows through the supply hole 7 at a different height position. It is supplied to the flame port 3 as secondary combustion air.

Reference numeral 17 denotes a supply path for supplying primary combustion air sucked through the suction port 18 to the combustor 1 by driving the combustion fan 2 .

19 is a stand to which the main body frame 4 is fixed.

Next, the operation of this embodiment of the invention will be explained. When the combustor 1 is combusted and the hot air fan 12 is driven, the combustion heat rising inside the combustion tube 6 is transferred to the hot air above the combustion tube 6. It merges with the air blown from the fan 12, and is pulled by the blown air to become warm air and is discharged into the room from the air outlet 16 at the lower front of the main body frame 4,
This system effectively heats the room from below.

At the same time, part of the air blown by the hot air fan 12 is
As shown by arrow a in the figure, while cooling the outer wall surface of the heat shield cylinder 8, the air flows into the air flow passage 9 forcefully from the secondary air flow port 11 at the rear, and a part of the air collides with the combustion cylinder 6 and is diverted. One part rises in the airflow passage 9, and the other part descends and is uniformly supplied to the flame port 3 as secondary combustion air from the supply holes 7 at different height positions.

Therefore, a part of the air supplied to the air flow passage 9 is pulled by the draft force caused by combustion and the blowing force of the hot air fan 12, creating an air flow that rises from below, and this always acts as long as the combustion continues. As a result, the heat from the outer wall surface of the combustion tube 6 and the inner wall surface of the heat shield tube 8 is absorbed and rises, and this absorbed heat for cooling can also be used as warm air for heating, providing efficient heating and the heat shielding tube 6. The rising air flow prevents the thermal effects caused by heat radiation from the air.

Furthermore, the rear of the heat shield cylinder 8 is a heat shield wall 10 higher than the front.
Since the hot air fan 12 is erected and covers more than half of the hot air fan 12, the hot air fan 12 itself is also reliably shielded from heat.

Moreover, the blowing pressure of the warm air fan 12 is
is obstructed by the combustion chamber 13, and is forced to flow into the combustion chamber 13 to the left and right or above, and the draft force generated by combustion causes the combustion tube 6 to flow into the combustion chamber 13.
This eliminates the problem of inhibiting combustion by pressing or counterflowing the combustion heat rising inside the interior from above, and on the contrary, pulls the combustion heat and releases it smoothly as warm air from the hot air outlet 16.

Also, because the positions of the supply hole 7 and the secondary air flow port 11 are different from each other, the secondary combustion air divided in the air flow passage 9 collides with the combustion tube 6, so that the blowing pressure is reduced, and therefore, The difference in the strength of the blowing pressure in the front and rear directions becomes smaller, and the draft force is uniformly drawn from each supply hole 7, so that the flame in the flame opening 3 will not be disturbed due to variations in the strength of the blowing pressure. .

In this way, even if there is a conflict between making the hot air heater more compact and increasing the amount of heat generated, it is possible to achieve reliable heat insulation by controlling the air flow of the hot air fan, and therefore the heater can be made more compact. , and does not have any negative effect on combustion.

<Effects of the invention> This invention includes a combustion tube 6 that covers the outer periphery of the flame port 3 at the upper part of the combustor 1 and is open from above and has a supply hole 7 for secondary combustion air in the lower peripheral wall. In a hot air heater that releases generated combustion heat directly into a room by blowing air from a hot air fan 12, the combustion tube 6
Since the air flow passage 9 is formed on the outer periphery and the heat shield cylinder 8 is provided, an air flow that always rises from below is generated in the air flow passage, and low-temperature air is used to protect the outer wall of the combustion cylinder and the heat shield cylinder. The inner wall can be cooled with air to provide reliable heat insulation.

Further, since the heat shielding cylinder 8 has a wind shielding wall 10 erected at the rear upper end thereof which is higher than the front end and covers more than half of the rear hot air fan 12, the hot air fan itself is also reliably heat shielded.

Moreover, the blowing pressure of the hot air fan is obstructed by the wind shielding wall and is forced to flow into the left, right, or upper part of the combustion chamber, and the draft force generated by combustion presses the combustion heat rising inside the combustion cylinder from above. The inhibition of combustion is eliminated, and on the contrary, the combustion heat can be smoothly released as warm air from the tension outlet.

In addition, the secondary air flow opening 11 is opened at the rear side of the lower part of the heat shield tube 8 at a different position from the supply hole 7 of the combustion tube 6, so that the secondary combustion air is once collided with the outer wall surface of the combustion tube. Therefore, the blowing pressure is reduced, and therefore the difference in the strength of the blowing pressure in the front and back directions is small, and the flame is not disturbed by the uniform draft force drawn from each supply hole, and the flame is not disturbed by variations in the secondary combustion air.

In addition, even though there is a conflict between making the hot air heater more compact and increasing the amount of heat generated, it is possible to achieve reliable heat insulation by controlling the airflow from the hot air fan, and therefore the size can be reduced accordingly. Moreover, it does not have any adverse effect on combustion.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the hot air heater of this invention, Figure 2
The figure is a perspective view of the heat shield cylinder. 1... Combustor, 3... Burner port, 6... Combustion tube,
7... Supply hole, 8... Heat shield tube, 9... Air flow path, 10... Wind shield wall, 11... Secondary air flow port,
12... Warm air fan.

Claims (1)

[Scope of utility model registration request] A combustion tube 6 is provided that covers the outer periphery of the flame port 3 at the upper part of the combustor 1 and is open upward and has a supply hole 7 for secondary combustion air in the lower peripheral wall. Combustion heat generated in the flame port 3 is transferred to a hot air fan 12. In a hot air heater that directly discharges air into a room by blowing air, an air flow passage 9 is formed on the outer periphery of the combustion tube 6, and a heat shield tube 8 is provided, with the upper end of the rear end facing forward. A higher wind shielding wall 10 is erected to cover more than half of the rear hot air fan 12, and a combustion tube 6 is placed on the rear side at the bottom of the heat shielding tube 8 at a different position from the supply hole 7 to create a secondary air circulation opening. A warm air heater characterized by having 11 openings.