Expansible duct seal construction for batch mixers and the like
AssigneeBaker Perkins Inc.
InventorClarence K. Scherping
Life of this patent
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Abstract
An expansible duct seal construction for a batch mixer vessel with a cover clamped to the open end of the vessel wherein a flexible duct perimetrally surrounds the cover and the end portion of the vessel adjacent the cover, the duct being secured to the sides of the vessel and including an expansion fold around its perimeter secured to the cover in a manner to prevent the escape of vaporous material. A gas under pressure is provided in the duct to balance the pressure in the duct with the gaseous pressure in the vessel and inhibit the migration of material from the vessel in the preferred form of the invention.
Claims14
An expansible duct seal construction for a batch mixer vessel with a cover clamped to the open end of the vessel comprising:
- a. a flexible duct, perimetrally surrounding said cover and the end portion of said vessel adjacent the cover, the duct having a perimetral wall extending generally parallel to the sides of the vessel and secured to the sides of the vessel around the perimeter thereof in a manner to prevent the escape of vaporous material;
- said duct includ-ing an expansion fold around its perimeter formed by a wall section inward of said perimeter wall extending in a reverse direction to said perimeter wall and connected thereto at a spaced distance therefrom;
- said duct including also a wall extending generally radially inwardly and secured to said cover in a manner to prevent the escape of vaporous material;
- b. and means for supplying a gas under pressure to said duct to balance the pressure in said duct with the gaseous pressure in said vessel and inhibit the migration of material from said vessel.
A method of preventing the migration of vaporous material from a batch mixer vessel with a cover clamped to the open end of the vessel comprising the steps of:
- a. sealably securing a flexible duct which peri-metrally surrounds said cover and the portion of said vessel adjacent the cover, and has an expansion fold around its perimeter, to the sides of the vessel, and to said cover, in a manner to prevent the escape of vaporous material;
- b. and supplying a gas to said duct under a pressure to balance the pressure in said duct with the gaseous pressure in said vessel and inhibit the migration of material from said vessel.
An expansible duct seal construction for a batch mixer vessel with a cover having a lateral flange clamped to the open end of the vessel by securing members permitting temperature caused, differential expansion of the flange and cover comprising a flexible, corrosion resistant, vapor-impermeable, sheet metal-like duct, perimetrally surrounding said cover and the end portion of said vessel adjacent the cover, said duct having a perimetral wall extending generally parallel to the sides of the vessel and secured to the sides of the vessel around the perimeter thereof in a manner to prevent the escape of vaporous material;
- said duct including an integral expansion fold extending around said perimeter wall, and a wall extending generally radially inwardly above said securing members which is secured to said cover in a manner to prevent the escape of vaporous material.
A method of preventing the migration of vaporous material from a batch mixer vessel, with a cover clamped to the open end of the vessel, to the room in which the mixer vessel is located comprising the steps of:
- a. sealably securing a flexible duct which perimetrally surrounds said cover and the portion of said vessel adjacent the cover and has an expansion fold around its perimeter, to the sides of the vessel, and to said cover, in a manner to prevent the escape of vaporous material;
- b. and communicating with said duct to egress any noxious materials therein and remove them for treatment and venting to the outside atomsphere.
Dependencies are inferred from the claim text.