Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1995-07-14
1997-10-21
Cummings, Scott
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277901, 277DIG7, F16J 1532, F16J 1546
Patent
active
056788312
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a sealing device of compartment gateways of continuous annealing furnaces, continuous painting equipments, and the like for preventing a danger of explosions or fires caused by a spark of static electricity in sealing portions of compartment gateways of continuous annealing furnaces, continuous painting equipments, and the like to perform bright annealing or oxidation-free annealing of metal strips such as stainless steel strips, silicon steel strips, aluminum strips, brass strips, and copper strips, wherein a flammable atmospheric gas having a danger of explosions or fires is used.
BACK GROUND OF THE INVENTION
Bright annealing furnaces or oxidation-free annealing furnaces to perform continuous annealing of metal strips such as stainless steel strips, silicon steel strips, aluminum strips, brass strips, and copper strips, when the case of a vertical furnace is concerned, have a structure wherein a metal strip (hereinafter sometimes referred to as "strip") to be annealed comes into the furnace from a lower portion of the furnace, goes inside the furnace and comes out again from the lower portion of the furnace. In such furnaces, in order to prevent the oxidation of the strip, a flammable gas having a danger of explosions or fires, such as, for example, a hydrogen gas-containing mixed gas, is used.
Also, in contiuous painting equipments, an organic solvent having a danger of explosions or fires in painting compartments of the metal strip is used.
In portions of inlets or outlets through which strips and the like pass, in compartments of these continuous annealing furnaces, continuous painting equipments, and the like, wherein a flammable gas having a danger of explosions or fires is used, devices for isolating (hereinafter sometimes referred to as "sealing") the compartment atmosphere from the outside of it by means of a pad comprising a wool felt only or a wool felt having a polyester fiber- or acrylic fiber-made felt laminated on the surface thereof, or the like (the pad being hereinafter referred to as "elastic pad") have been commonly employed.
The conventionally used general bright annealing furnace of a stainless steel strip will be hereunder explained.
FIG. 2 is a drawing to explain the structure of a conventionally used bright annealing furnace of a stainless steel strip, wherein a strip 1 passes through an inlet sealing portion 5 via a roll 4, comes into a furnace body 2, and passes again through an outlet sealing portion 6 when it comes out. In the furnace body 2, a furnace atmospheric gas 7 containing a hydrogen gas is always introduced, the furnace pressure is kept at a gauge pressure of from about 10 to 50 mmH.sub.2 O (water column), and the furnace atmospheric gas leaks out little by little from the inlet sealing portion 5 and outlet sealing portion 6.
FIG. 3 is an enlarged front sectional view of one example of the conventionally used outlet sealing portion 6, wherein each elastic pad 13 is sandwiched between a metallic roll 11 and a sealing hardware 12. This elastic pad 13 is drawn by the friction with the strip 1, the metallic roll 11 is provided with a detent, and in the case that contaminants or stains are accumulated on the elastic pad 13, the detent is removed so that the roll 11 is rotated. That is, the metallic roll 11 does not rotate except when a clean portion of the elastic pad 13 is brought into contact with the strip 1. This structure will be further explained with reference to FIG. 4 which is a front view of FIG. 3 as well as FIG. 5 which is a side view of FIG. 4. Each lever 9 is tightly fixed to a pivot pin 10 acting as a rotation center, a nose portion of which is installed with a bearing 15 supporting a roll axis 14 of the metallic roll 11, but a heel portion of which is applied with an actuating force of a cylinder 8. The two metallic rolls 11 press the respective elastic pads 13 to the strip 1 passing between the rolls 11 and simultaneously push them against the sealing hardwares 12, to thereby isolate the inside of the fu
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Cummings Scott
Nisshin Steel Co. Ltd.
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