JPS6348928B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention The present invention relates to a fluid sealing device for an inlet/outlet of a strip heat treatment furnace, which is configured to seal off the atmosphere inside the furnace and the outside air at the inlet/outlet of a strip heat treatment furnace. be.

(b) Background of the Invention Conventionally, there have been methods using rollers and fluids as means for sealing the entrance and exit of strip heat treatment furnaces.

However, in both cases the seal was insufficient. In other words, in the case of the former roller seal, there are troubles such as changes in the thickness of the strip coil and handling when the strip passes through the connection part, and with the latter fluid seal, sealing is mainly performed by jet pressure, but there are problems with seal failure. However, there was a drawback that the amount of sealing fluid flowing into the atmosphere inside the furnace and flowing out of the furnace was large.

(c) Purpose of the Invention The present invention provides a strip heat treatment furnace that can completely isolate the furnace atmosphere at the furnace entrance and exit from the outside air, prevent the furnace atmosphere from flowing out, and further reduce the loss of sealing fluid. The purpose of the present invention is to provide an inlet/outlet fluid sealing device.

(D) Structure of the Invention This invention provides a strip heat treatment furnace with a strip line at a strip passage entrance and exit, in which pairs of nozzles are opposed from two directions, and each pair of nozzles are disposed in a direction that intersects with the strip line to generate a jet flow. The present invention is characterized by a fluid sealing device for the entrance and exit of a strip heat treatment furnace that generates static pressure, constantly measures the generated static pressure, and performs sealing while adjusting the generated static pressure.

(E) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawing shows an inlet/outlet fluid sealing device for a strip heat treatment furnace, and the reference numeral 1 in the drawing is a strip coil.
On the inlet side of the furnace, it passes from the outside 2 to the inside 3 of the furnace, and on the exit side (not shown), it passes from the inside 3 to the outside 2 of the furnace. 4, 4a and 6, 6a are two pairs of vertically opposed nozzles.

Each nozzle 4, 4a, 6, 6a is inclined inward and faces each other, and a pair of nozzles 4, 4a, 6, 6a
Static pressure generating sections 5 and 7, which will be described later, are formed between them.

Furthermore, each nozzle 4, 4a, 6, 6a is connected to a duct 9, 10 that communicates with the blower 8 and a pressure accumulation chamber 11,
It communicates via 12.

Dampers 9a and 10a are provided in the conduction pipe 8a that communicates with the blower 8 and the ducts 9 and 10, respectively.

The static pressure generating sections 5 and 7 described above are rectifying sections 13 and 1, respectively.
4, 15, 16, and these passages 21, 22 are connected to flow control valves 19, 20.
It communicates with exhaust fans 17 and 18 via.

Furthermore, a pressure detector 2 is installed in the static pressure generators 5 and 7.
3, 24 are installed, and the static pressure generating parts 5, 24 are always installed.
The exhaust flow rate of the exhaust fans 17 and 18 can be adjusted by measuring the static pressure of the exhaust fans 17 and 18, and sending the signal to the respective flow rate control valves 19 and 20.

With the above configuration, the blower 8 blows air (for example, inert gas) to the ducts 9 and 10. At this time, the dampers 9a and 10a adjust the amount of air, and the air is blown to the ducts 9 and 10, and the air is ejected from the nozzles 4, 4a, 6, 6a through the pressure accumulation chambers 11, 12 through the ducts 9, 10. are doing.

Since the nozzles 4 and 4a are inclined inward toward each other, the ejected air flow mainly flows between the nozzles 4 and 4a and collides with each other, thereby generating static pressure in the static pressure generating section 5. Similarly, since the nozzles 6 and 6a are inclined inward toward each other, the ejected gas flows between the nozzles 6 and 6a and collides with each other, so that static pressure is generated in the static pressure generating section 7. Since pressure detectors 23 and 24 are installed in the static pressure generating sections 5 and 7, static pressure is always detected to adjust the flow rate of the flow rate control valves 19 and 20.

If the static pressure in the pressure generating parts 5 and 7 is slightly higher than the external pressure outside the furnace 2 and the atmospheric pressure inside the furnace 3, the outside air and the atmosphere are cut off.

The gas flowing into the static pressure generating parts 5, 7 from the nozzles 4, 4a, 6, 6a, respectively, passes through the pressure detectors 23, 24.
The pressure is detected and adjusted to a static pressure slightly higher than the outside pressure and atmospheric pressure, and the excess gas is removed by exhaust fan 1.
At this time, the outflowing gas flows out while equalizing the static pressure in the strip width direction at the rectifying sections 13, 14, 15, and 16.

(F) Effects of the Invention According to the present invention, instead of the conventional sealing method using jet dynamic pressure, the jet dynamic pressure is converted into static pressure to stabilize the passage of the strip at the furnace entrance and exit. In addition, since a pressure detector is installed in the static pressure generating section, the static pressure can be maintained at a level slightly higher than the external pressure outside the furnace and the atmospheric pressure inside the furnace by adjusting the flow rate. There is no leakage of atmospheric gas, which prevents contamination of the furnace atmosphere and reduces consumption of sealing fluid. In addition, since a rectifier is provided in the gas outflow passage, the outflowing gas flows while equalizing the static pressure in the width direction of the strip, and is not affected by the slight strength or weakness of the internal or external gas jet flow. The static pressure section can maintain a constant and stable pressure without adversely affecting the maintenance of furnace pressure or stripping.

Furthermore, when an inert gas is used in the furnace atmosphere, if the sealing gas is used as the inert gas, the sealing gas can be sufficiently recovered and the loss of the inert gas can be further reduced.

[Brief explanation of drawings]

The drawing is a simplified longitudinal sectional side view of a main part of an inlet/outlet fluid sealing device for a strip heat treatment furnace showing an embodiment of the present invention. 1... Strip coil, 2... Outside the furnace, 3...
Furnace interior, 4, 4a, 6, 6a... Nozzle, 5, 7...
...Static pressure generation part.

Claims (1)

[Claims] 1. Pairs of nozzles are placed opposite each other from two directions on the strip line at the strip passage entrance and exit of the strip heat treatment furnace, and the directions of the nozzles of each pair are arranged in a direction that intersects to generate a static pressure section. In addition to sealing the atmosphere inside the furnace, a pressure detector is installed in the static pressure generating section to measure and control the generated static pressure.
1. A fluid sealing device for an inlet/outlet of a strip heat treatment furnace, characterized in that a rectifier is provided in a gas outflow passage.