JPH03165867A - Furnace system - Google Patents

Abstract

PURPOSE:To permit rapid heating and to obtain the furnace system suitable for baking powder coating by constituting the furnace system of radiation burners provided along the lower side of the transfer passage in a furnace chamber and of the insulating reflection wall of tunnel shape in which the upper side is enclosed and reflecting material and insulating material are used respectively in inner wall surface and outer wall surface. CONSTITUTION:The rapid heating furnace 1a is enclosed with the insulating reflection wall 4 of tunnel shape in which the radiation burners 3, such as infrared ray burners of gaseous fuel, are provided along the lower side of the transfer passage 2 in the furnace chamber 5, and the reflecting material, such as stainless steel plate and aluminum plate, is used for the inner wall surface of the upper side above the transfer passage 2, and insulating material is used in the outer wall surface. The furnace chamber 5 is connected with an exhausting duct 11 to discharge the high temp. combustion gas of the burner 3, which is sent from the exhausting duct 11 through a fan 6 and a temp. raising unit 7 to a soaking pit 1b to be used there. By this constitution, when an object 10 is sent along the transfer passage, the upper and the lower sides and side surfaces of the object are simultaneously heated with radiation with the result that rapid heating is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a furnace system used for applications such as a baking furnace for powder coatings.

(Prior art) Some conventional baking furnaces for powder coatings use high-temperature hot air, but with this method, there is a risk that the powder coating applied to the surface of the object may be blown away by the hot air. Therefore, the hot air speed could not be increased and the processing time was slow.

On the other hand, there are also methods that use a radiant electric heater, but rapid heating has not been achieved even with this method.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and enables rapid heating, and aims to provide a furnace system that is extremely suitable for baking powder coatings, etc.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides: 1. a radiant burner provided along the lower side of the conveyance path in the furnace chamber; Furnace system with a rapid heating furnace consisting of a tunnel-shaped insulating reflective wall using reflective material and a heat insulating material on the outer wall 2. A soaking furnace that guides high-temperature combustion gas from a radiation burner and heats it by convection. We propose a furnace system that is installed continuously behind a rapid heating furnace.

(Function) (1) Since the furnace system of the present invention particularly has a heat insulating reflective wall, the entire upper, lower and side surfaces of the object can be heated radiatively at the same time, making it possible to rapidly heat the object.

(2) In particular, the furnace system of the present invention is capable of rapid heating because it uses both radiant heating using a cutting harmer and convection heating using high-temperature combustion scum.

(Example) The furnace system of the present invention will be described below according to an example shown in the drawings.

FIG. 1 shows the furnace system of the present invention, the furnace system (
+) has a rapid heating furnace (Ia) (left side in Figure 1).

As shown in FIG. 2, the rapid heating furnace (1a) is provided with an open burner (3) such as a waste-fired infrared burner along the lower side of the conveying path (2) in the furnace chamber (5).

Next, the upper side of the conveyance path (2) has a stainless steel plate on its inner wall surface.
It is surrounded by a tunnel-shaped heat-insulating reflective wall (4) made of anti-corrosion material such as an aluminum plate and made of a heat-insulating material on its outer wall.

Next, the furnace chamber (5) is connected to an exhaust duct (I+) for discharging high-temperature combustion scum from the open burner (3).

Next, the high-temperature combustion residue is passed from the exhaust duct (I+) to the fan (6) and temperature raising device a (7), and then to the soaking furnace (lb).
used for.

That is, the soaking furnace (lb) is provided continuously behind the rapid heating furnace (1a) when used for applications such as a baking furnace for powder coatings.

However, depending on the application, the soaking furnace (Ib) can be omitted and only the rapid heating furnace (Ia) can be used.

The soaking furnace (Ib) blows out the heated combustion scum from the blow-off port (8) and sends it out from the suction port (9) to the temperature-raising device (
7), the inside of the furnace is heated by convection using hot air.

The functions of the furnace system of the present invention shown in the above embodiments are as follows.

That is, the object (10) is sent along the conveyance path (2), but is being burned in the radial burner (3) in the furnace chamber (5) of the rapid heating furnace (la).

The surface of the radiant burner (3) has a temperature of, for example, 850 to 900°C, from which infrared rays are emitted.

The infrared rays directly hit the carved object (10) and heat the underside of the object (10), while being reflected by the heat-insulating anti-cut wall (4) and damaging the object (10).
Also heat the top and sides.

Furthermore, high-temperature combustion residue from the radiant burner (3) flows into the furnace chamber (5).
The object (lO) is also heated by convection heating.

As a result, in the poor heating illusion 1 (la), the object (lO)
The fish heats up faster.

Next, as shown in FIG. 1, when a soaking furnace (Ia) is provided at the rear, the object (10) is further heated in pulses by hot air and held in a high marsh for a certain period of time.

In other words, in applications such as baking powder coatings, a soaking furnace (1
b) is often necessary.

(Effects of the Invention) The embodiments of the furnace system of the present invention are as described above, and the effects thereof are listed below.

(1) Since the furnace system of the present invention has a particularly heat-insulating anatomical wall, the entire upper, lower and side surfaces of the object can be simultaneously heated radiatively and rapidly heated.

- 5 - (2) In particular, the furnace system of the present invention is capable of rapid heating because it uses both radiation heating using a split burner and convection heating using high-temperature combustion gas.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the furnace system of the present invention. FIG. 2 is a cross-sectional view of the same furnace system as described above. Hanakabe 5: Furnace room
6: Fan 7: Temperature raising device 8: Air outlet 9: Suction port 1O2 object 11: Exhaust duct

Claims (1)

[Claims] 1. A radiant burner provided along the lower side of the conveyance path in the furnace chamber, a reflective material surrounding the upper side of the conveyance path, and a reflective material being used on the inner wall surface thereof, and a heat insulating material being used on the outer wall thereof. Furnace system 2 has a rapid heating furnace consisting of a tunnel-shaped insulated reflective wall, and a furnace system in which a soaking furnace that guides high temperature combustion gas from a radiant burner and heats it by convection is installed continuously behind the rapid heating furnace.