JPH0141115Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a hot air generator that circulates and supplies hot air into various heat treatment furnaces such as paint drying furnaces.

[Prior art and its problems]

The conventional hot air generator, as shown in Figure 3,
The combustion furnace is installed in a box-shaped combustion furnace 1 consisting of an insulating wall filled with a heat insulating material such as rock wool or glass wool between an outer plate made of ordinary steel plate and an inner plate made of stainless steel plate or aluminized steel plate. A burner 2 serves as a combustion device that heats the air in the combustion furnace 1 to a required temperature, and the air in the heat treatment furnace 3 is sucked into the combustion furnace 1 through the hot air suction port 4, and the air heated in the combustion furnace 1 is heated. A hot air circulation fan 6 that circulates and supplies hot air to the heat treatment furnace 3 through the air outlet 5
It is said that the configuration includes the following.

Here, the burner 2 and the hot air circulation fan 6 are arranged facing each other and separated from each other on the right and left sides of the combustion furnace 1 as seen in the figure, and the hot air suction port 4 and the hot air blowing port 5 are also spaced apart from each other so that the burner 2 and the hot air circulation fan 6 are spaced apart from each other. It is formed near the circulation fan 6. Then, air inside the heat treatment furnace 3 is sucked through a hot air suction port 4 formed on the burner 2 side, heated by the burner 2, and then transferred by a hot air circulation fan 6 through a hot air outlet formed on the hot air circulation fan 6 side. 5
The heat treatment furnace 3 is supplied again through the heat treatment furnace 3.

However, when the hot air suction port 4 for sucking the air in the heat treatment furnace 3 and the hot air outlet 5 for supplying heated air into the heat treatment furnace 3 are formed to be separated from each other, a particularly small size The heat treatment furnace 3 had a drawback in that the heat distribution within the furnace was extremely non-uniform.

[Purpose of invention]

Therefore, the main purpose of the present invention is to make the heat distribution uniform, especially in a small heat treatment furnace, by providing the hot air suction port and hot air outlet of the hot air generator close to each other using extremely simple means. .

[Structure of the invention] In order to achieve this object, the present invention includes a combustion furnace in which a hot air suction port and a hot air outlet are formed, and a combustion device that heats the air in the combustion furnace to a required temperature;
In a hot air generator equipped with a hot air circulation fan that circulates air inside the heat treatment furnace sucked through the hot air suction port and into the heat treatment furnace through the hot air outlet, the inside of the combustion furnace is divided into upper and lower parts by a partition wall. The upper space and the lower space formed by the above are communicated with each other via a hot air circulation fan, and one space is formed into a combustion chamber in which a combustion device is disposed, and
On the other side of the space, a hot air suction port is formed at one end, a hot air passage passes through the partition wall and communicates with the combustion chamber at the other end, and a hot air outlet is formed at one end adjacent to the hot air suction port. The hot air passage is characterized in that the other end thereof is formed in communication with the combustion chamber via the hot air circulation fan.

[Effect of invention]

According to the present invention, when the hot air circulation fan is operated, the air inside the heat treatment furnace is sucked into the combustion chamber from the hot air suction port of the hot air passage that passes through the partition and communicates with the combustion chamber. The heated air is fed to a hot air passage connected to the combustion chamber via a hot air circulation fan, and is returned to the heat treatment furnace through a hot air outlet provided in the hot air passage in close proximity to the hot air suction port. Since the heat treatment furnace is supplied with heat, the heat distribution within the heat treatment furnace becomes uniform.

〔Example〕

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 1 is a sectional view showing an example of a hot air generator according to the present invention.

Note that parts common to those in FIG. 3 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In the present invention, the combustion furnace 1 is
The inside is divided into upper and lower halves to form an upper space S ₁ and a lower space S ₂ , and these upper space S ₁ and lower space S ₂ are communicated with each other via a hot air circulation fan 6 consisting of a turbo fan or the like. S ₁ is formed in a combustion chamber 8 in which a burner 2 is arranged, and a hot air suction port 4 is formed at one end on the lower space S ₂ side, and the other end is communicated with the combustion chamber 8 through a partition wall 7. A hot air passage 9 is formed, and a hot air passage 10 has one end formed with a hot air outlet 5 adjacent to the hot air suction port 4 and the other end communicated with the combustion chamber 8 via a hot air circulation fan 6. .

The hot air outlet 5 is formed by opening the bottom wall of the combustion furnace 1 to a desired size on the burner 2 side, and the hot air suction port 4 is formed at the center of the hot air outlet 5 by crossing the inside of the hot air passage 10. A hot air passage 9 is formed, which penetrates the partition wall 7 and opens below the burner 2 in the combustion chamber 8, and a hot air suction port 4 and a hot air outlet 5 are provided concentrically. .

In the figure, 11 is a suction tube disposed at the suction port of the hot air circulation fan 6, and 12 is a motor for driving the circulation fan 6.

The above is an example of the configuration of the hot air generator according to the present invention, and the operation thereof will be explained next.

First, the burner 2 is combusted in the combustion chamber 8 which is surrounded by the ceiling wall and side walls of the combustion furnace 1 and the partition wall 7 which are made of heat insulating walls. Motor 12 of hot air circulation fan 6
Activate.

As a result, the air inside the heat treatment furnace 3 is sucked from the hot air suction port 4 of the hot air passage 9 by the hot air circulation fan 6, and is fed into the combustion chamber 8 through the inside of the hot air passage 9. is heated and receives heat.

The hot air heated in the combustion chamber 8 is sucked from the suction cylinder 11 of the hot air circulation fan 6 disposed opposite the burner 2, and is surrounded by the bottom wall and side walls of the combustion furnace 1 and the partition wall 7. The hot air is supplied into the hot air passage 10 , and is circulated through the hot air passage 10 and into the heat treatment furnace 3 from the hot air outlet 5 that opens around the hot air suction port 4 of the hot air passage 9 .

As described above, according to the present invention, the air inside the heat treatment furnace 3 sucked from the hot air suction port 4 of the hot air passage 9 is heated in the combustion chamber 8, and the heat generated around the hot air suction port 4 is heated. Since the air is again supplied into the heat treatment furnace 3 from the air outlet 5, the heat treatment furnace is The heat distribution within 3 becomes very uniform.

Therefore, it can be used, for example, in a drying oven for painting automobile parts and the like, which require extremely strict product quality, to uniformly dry the paint film, and the quality of the paint film can be significantly improved.

Further, according to the present invention, the combustion furnace 1 comprising a heat insulating wall
By dividing the inside into two with the partition wall 7, the hot air suction port 4
Since a hot air passage 9 having a hot air passage 9 and a hot air passage 10 having a hot air outlet 5 are formed, for example, compared to a case where a hot air supply duct is separately installed outside the combustion furnace 1 to form a hot air passage. It has the advantage of very little heat loss.

Furthermore, since the combustion chamber 8 is also adjacent to the hot air passage 10 through which hot air flows through the partition wall 7, the third
As shown in the figure, there are advantages in that heat loss is small and thermal efficiency is extremely high compared to the case where all six sides of the combustion furnace 1, which serve as combustion chambers, are surrounded by heat insulating walls that are in direct contact with the outside air.

In the above embodiment, the upper space S ₁ divided into two by the partition wall 7 is the combustion chamber 8, and the lower space S ₂ is the combustion chamber 8.
Although the case has been described in which the hot air passages 9 and 10 are formed on the side, in the present invention, contrary to the above, the hot air passages 9 and 10 are formed on the upper space S ₁ side, and the lower space S ₂ is formed on the combustion chamber 8. Of course, the hot air suction port 4 and the hot air outlet 5 may be formed adjacent to each other on the ceiling wall side of the combustion furnace 1.

Further, in the embodiment, a case has been described in which the hot air suction port 4 is formed concentrically at the center of the hot air outlet 5, but the invention is not limited to this. In short, it is sufficient that the hot air suction port 4 and the hot air outlet 5 are formed close to each other.

That is, FIG. 2 is a sectional view showing another example of the hot air generator according to the present invention, and shows the space below the combustion furnace 1.
A hot air passage 9 is formed in S ₂ to extend along the partition wall 7 , one end of the hot air passage 9 penetrates the partition wall 7 and opens into the combustion chamber 8 , and the other end is located below the hot air circulation fan 6 . A hot air suction port 4 is formed in the bottom wall of the combustion furnace 1 on the side, and hot air blowing ports 5 of a hot air passage 10 are formed adjacent to the hot air suction port 4 at the front and rear or left and right sides thereof.

In this case as well, the same effects as the hot air generator shown in FIG. 1 can be obtained.

[Effect of idea]

As described above, according to the present invention, the inside of the combustion furnace is divided into two by the partition wall, and a combustion chamber and a hot air passage having a hot air suction port and a hot air outlet are formed, and the air inside the heat treatment furnace is sucked. The hot air suction port that supplies hot air to the combustion chamber and the hot air outlet that circulates the heated air inside the combustion chamber and into the heat treatment furnace are located close to each other. It has the excellent effect of making the heat distribution within the interior extremely uniform, and at the same time has the effect of reducing heat loss and providing extremely high thermal efficiency.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views showing an example of a hot air generating device according to the present invention, and FIG. 3 is a sectional view of a conventional device. Explanation of symbols, 1... Combustion furnace, 2... Burner (combustion device), 3... Heat treatment furnace, 4... Hot air suction port,
5...Hot air outlet, 6...Hot air circulation fan, 7...
...Partition wall, 8...Combustion chamber, 9...Hot air passage, 10...
...hot air passage, S ₁ ... upper space, S ₂ ... lower space.

Claims (1)

[Scope of utility model registration request] A combustion furnace having a hot air suction port and a hot air outlet is provided with a combustion device for heating the air in the combustion furnace to a required temperature, and the air inside the heat treatment furnace sucked through the hot air suction port is recirculated through the hot air outlet. In a hot air generator equipped with a hot air circulation fan that circulates and supplies air into a heat treatment furnace, an upper space and a lower space, which are formed by dividing the inside of the combustion furnace into upper and lower halves by a partition wall, communicate with each other via the hot air circulation fan. One space was formed as a combustion chamber in which a combustion device was installed, and the other space had a hot air suction port formed at one end and the other end communicated with the combustion chamber through the partition wall. A hot air passage is formed, and a hot air passage is formed at one end of which a hot air outlet is formed adjacent to the hot air suction port and at the other end communicated with the combustion chamber via the hot air circulation fan. Hot air generator.