JPS6126355Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an improvement of the cooling chamber of a box-type annealing furnace. A heating chamber 1 as shown in Fig. 1 as a box-type annealing furnace
0 and cooling chamber 11 are provided separately. Conventionally, a structure as shown in FIG. 2 has been adopted as the cooling chamber 11 in such a box-type annealing furnace. That is, a heat exchanger 13 for cooling the atmospheric gas is installed in a duct 12 for circulating the atmospheric gas provided on the side of the cooling chamber 11, and the atmospheric gas sucked from the duct 12 is directed downward into the cooling chamber 11. A forced circulation fan 14 for blowing air toward the coil 6 and a rectifying plate 18 directly below the forced circulation fan 14 are installed.
The coil 6 is placed flat on the tray 16 through the heating chamber 10, and then the tray 16 is moved into the cooling chamber 11, and the atmospheric gas cooled by the heat exchanger 13 is passed through the forced circulation fan 14. Current plate 1
8 to the top surface of the coil 6, each coil 6
cooling is performed. However, in the cooling chamber 11 having such a structure, the forced circulation fan 14 is installed inside the cooling chamber 11, so that its maintenance is complicated. Generally, in order to shorten the purging time of the cooling chamber 11, it is desirable to reduce the internal volume of the cooling chamber 11 as much as possible, and for this reason, in the cooling chamber 11, the interval between the forced circulation fan 14 and the rectifying plate 18 is reduced. It's narrow. However, in such a structure, it is difficult to make the discharge flow velocity distribution of the forced circulation fan 14 uniform by the rectifying plate 18, and the discharge pressure may even become negative depending on the location. Such non-uniformity in the discharge flow velocity distribution inevitably leads to non-uniformity in the flow direction and flow velocity of the atmospheric gas hitting the coil 6, and as a result, the cooling time of the coil 6 also varies depending on the location. I become confused. Since the cooling time required for one charge is determined by the coil 6 that cools the slowest, the above-mentioned variation in the cooling time required will reduce the cooling efficiency and eventually the annealing efficiency. 〓〓〓〓
The present invention was devised in view of the above-mentioned difficulties in the conventional cooling chamber, which facilitates the maintenance of forced circulation fans and also makes the direction and velocity of the flow of atmospheric gas uniform as it hits the coil. Its purpose is to provide. Therefore, the present invention includes a duct for circulating atmospheric gas whose upper and lower ends are respectively connected to the upper and lower parts of a cooling chamber, a heat exchanger for cooling the atmospheric gas provided in the duct, and an upper end of the duct. In order to form multiple atmospheric gas flow paths that can supply atmospheric gas distributed in the width direction of the cooling chamber to the upper surface of the coil, a forced circulation fan is installed at the cooling chamber from the position of the forced circulation fan. Its basic feature is that it includes a plurality of rectifier plates extending inward and having their distal ends bent diagonally downward. Embodiments of the present invention will be described below based on the drawings. 3 and 4 show an embodiment of the present invention, and 1 is a cooling chamber according to the present invention. The cooling chamber 1 includes a duct 2 for circulating atmospheric gas disposed outside the furnace wall, a heat exchanger 3 for cooling the atmospheric gas disposed within the duct 2, and the duct 2.
It has a forced circulation fan 4 provided at the inner upper end, and a plurality of rectifying plates 5 extending toward the inside of the cooling chamber 1 from the position of the forced circulation fan 4. The duct 2 is disposed outside the furnace wall, and its upper and lower ends are connected to the upper and lower parts of the cooling chamber 1, respectively, and communicate with the inside of the cooling chamber 1. In this embodiment, a pair of ducts 2 are provided on each side of the cooling chamber 1. The heat exchanger 3 is provided at a substantially intermediate portion in the longitudinal direction of each duct 2, and cools the atmospheric gas flowing through each duct 2. The forced circulation fan 4 is provided at the upper end of each duct 2, respectively. This forced circulation fan 4
This device sucks the atmospheric gas cooled by the heat exchanger 3 and blows it into the cooling chamber 1 from the upper end of the duct 2. With this device, the atmospheric gas flows through the cooling chamber 1 and each duct 2. It is circulated. The plurality of baffle plates 5 are provided to evenly apply the atmospheric gas blown from the forced circulation fans 4 to the upper surface of the coil 6, and are arranged at the positions of the forced circulation fans 4, 4 and 4, 4 on both sides in the width direction of the cooling chamber. The coils 6 are provided in such a way that they extend toward the inside of the cooling chamber, and their tips are bent downward, so that the coils 6 are distributed in the width direction of the cooling chamber 1 with respect to the upper surface of the coil 6 on each left and right side of the inside of the cooling chamber 1. Gas passages 51 are formed to supply atmospheric gas. In addition, in this embodiment, in order to uniformly distribute and supply the atmospheric gas from the forced circulation fan 4 in the width direction of the inlet side of the gas flow path 51, the gas discharge side of the forced circulation fan 4 is provided with a longitudinal direction. The current plate 52...
is provided toward the inlet side of the gas flow path 51. Furthermore, in order to further disperse the atmospheric gas flow discharged from the gas flow path 51, the lower part of the outlet side of the gas flow path 51 formed by the rectifying plate 5 has a horizontal plate shape and a large number of A rectifying plate 18 provided with an atmospheric gas outlet 19 is provided.
In this embodiment, the current plate 18 is composed of a lattice plate. Next, the operation of the present invention will be explained. A plurality of coils 6 placed horizontally on a tray 16 are heated in a heating chamber 10 and then conveyed to the cooling chamber 1 through an intermediate door 17, where they are cooled. Inside the cooling chamber 1, atmospheric gas is circulated within the cooling chamber 1 and the duct 2 by a forced circulation fan 4, thereby cooling the coil 6. That is, the atmospheric gas supplied from above comes into contact with the inner and outer peripheries of the coil 6 to cool it, is led into the duct 2 through the cavity of the plenum chamber 15, is cooled by the heat exchanger 3, and is further cooled from above. The forced circulation fan 4 supplies the air into the cooling chamber 1 again. In the above process, a forced circulation fan 4 is provided at the upper end of the duct 2, and the atmospheric gas supplied into the cooling chamber 1 is controlled by each gas flow formed by the rectifier plates 5. Since it is guided to the upper surface of the coil 6 through the passage 51, the directionality of the flow is good, and therefore the flow velocity distribution of the atmospheric gas on the outlet side of the gas passage 51 is made uniform in the width direction of the cooling chamber 1. . In addition, in this embodiment, on the inlet side of the gas flow path 51, the flow velocity distribution in the width direction of the inlet side is dispersed and made uniform by the rectifier plates 52... In addition, the flow of atmospheric gas discharged from the gas flow path 51 is further dispersed by the rectifier plate 18 immediately below the outlet side of the gas flow path 51, and a more uniform gas flow rate can be obtained. FIG. 5 shows the results obtained on the outlet side of the current plate 18 of this embodiment.
An example of the gas flow velocity distribution obtained is shown in comparison with that obtained by the conventional apparatus shown in FIG. According to this, in the conventional device, there is a large variation in the gas flow velocity, and negative pressure is generated especially at two places on the left and right, whereas in this example, a substantially uniform flow velocity is obtained in the width direction, and the coil 6 It is shown that the upper surface is almost evenly exposed to the atmospheric gas. The table below shows 9 pieces (3 x 3) arranged on a tray.
A number of coils) were cooled in the cooling chamber of the present invention shown in Figure 4 and the conventional cooling chamber shown in Figure 2, and the cooling time and temperature of the coil hot point at the end of cooling (the coil This shows the results of an investigation of the temperature at the highest temperature point. In the table, the average value of the hot point temperature of each coil is shown, and σ shows the dispersion of the hot point temperature.

[Table] As is clear from this table, the cooling chamber of the present invention has a small σ value and each coil is cooled almost uniformly.Moreover, in the conventional cooling chamber, the coil No. with the highest temperature at the hot point It takes 23.2 hours to cool coil No. 5 to 185℃, but in the cooling chamber of this invention, it takes only 20.7 hours to cool coil No. 4 to 180℃. It can be seen that it has also been shortened. As a result, it was confirmed that the cooling efficiency improved by approximately 10%. As described above, according to the cooling chamber of the box-type annealing furnace according to the present invention, a large number of coils can be uniformly cooled in one charge, thereby shortening the cooling time and greatly improving the cooling efficiency compared to the conventional method. is possible,
In addition, since the forced circulation fan is provided at the upper end of the duct located outside the furnace wall, there are advantages such as ease of maintenance.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional box-type annealing furnace. Figure 1 is a plan view, and Figure 2 is a
It is a sectional view along a line. 3 and 4 show an embodiment of the present invention, in which FIG. 3 is a plan view together with a heating furnace, and FIG. 4 is a sectional view taken along the line - in FIG. 3. FIG. 5 shows the gas flow velocity distribution in the cooling chamber of the present invention shown in FIG. 4 in comparison with that of the conventional cooling chamber shown in FIG. In the figure, 1 is a cooling room, 2 is a duct, 3 is a heat exchanger,
4 is a forced circulation fan, 5 is a rectifying plate, and 51 is a gas flow path. 〓〓〓〓

Claims (1)

[Scope of utility model registration request] a duct for circulating atmospheric gas whose upper and lower ends are respectively connected to the upper and lower parts of the cooling chamber; a heat exchanger for cooling the atmospheric gas provided within the duct; and a forced circulation provided at the upper end of the duct. In order to form a complex atmospheric gas flow path that can supply atmospheric gas distributed in the width direction of the cooling chamber to the top surface of the coil, the fan and the coil extend from the position of the forced circulation fan toward the inside of the cooling chamber. A cooling chamber of a box-shaped annealing furnace comprising a plurality of straightening plates whose tips are bent diagonally downward.