RU2456521C2 - Unit of sealing furnace worm shaft with granular materials - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: unit of sealing furnace worm shaft with granular materials contains screw 1, sealing bushing 2, whereby in the sealing area the shaft is equipped with sleeve 4 made of a high strength material and it has spiral grooves 6 with a polished surface and slopes 7 with angles of over 10 degrees on outer surface 5 in order to avoid self-blocking in the grooves of the granular material. The said sealing bushing 2 has grooves 10 with polished surface on internal surface 9 that are made capable of rotating in the direction opposite to the one of the shaft and slopes 11 with angles excluding a possibility of material self-blocking in the grooves whereby the shaft rotating direction ensures squirting of granular material 8 back into furnace 12.

EFFECT: reliable sealing of the shaft in the furnace hot area is ensured and low maintenance cost.

1 dwg

Description

The device is designed for sealing shafts in high temperature furnaces and can be used in compaction of pyrolysis, cement and other calcining furnaces working with bulk materials in the building materials industry.

A known device "SEALING A ROTATING FURNACE". Patent No. 2047827, RU, C1, IPC6 F27B 7/24. Application: 5044150/33, 05.26.1992. Published: November 10, 1995.

The seal of the rotary kiln contains coaxial rotating and stationary cylindrical shells with rings, on which telescopic split shells with leashes are located, pressed to the rings and to each other by spring-loaded cables.

The disadvantage is the low reliability due to the use of cables and springs. A device is known “SEAL BETWEEN THE FIXED CAMERA AND A ROTATING FURNACE”. Application: 96112038/03, 09/27/1998 RU, A, IPC6 F27B 7/24.

1. The seal between the fixed chamber and the rotary kiln, comprising a fixed and movable cylindrical shells and a sealing element between them from a coil spring with a filler, characterized in that the coil spring is screwed into the holes at the end of the movable or fixed shell.

2. The seal according to claim 1, characterized in that the cylindrical spring is equipped with a short pressure shell secured to it.

The disadvantage is the low reliability due to the use of a spring.

A device is known "SCREW FOR MOVING SOLID MATERIAL WITH SEALING STRUCTURE AND METHOD FOR PRODUCING RESTORED METAL WITH ITS USE". RU. Patent No. 2299389, C2, IPC F27B 7/24 (2006.01), F27D 3/08 (2006.01). Application: 2005127625/02, 12/25/2003.

The invention relates to a sealing structure of a screw for supplying a solid substance, in particular, a screw for leveling the starting material and a screw for unloading products installed in a heating furnace, capable of lifting a screw for feeding a solid substance with guaranteed ensuring the tightness of the heating furnace even during operation. The drive shaft of the auger for supplying solid material passes through the through holes formed in both side walls of the heating furnace and is supported on lifting support devices mounted on both external sides of the furnace. The design provides for sealing blocks mounted outside the furnace at the outer edges of the through holes that surround the through holes from the outside on the periphery, and movable flaps having holes for sliding the drive shaft of the screw. The movable shields are brought into contact with the sealing blocks through the sealing elements while maintaining the possibility of movement in the vertical direction. (Prototype).

The disadvantage is complexity and insecurity.

The technical result is the creation of a reliable simple shaft seal when working with bulk materials using feed augers in the working hot zone of the furnace.

The technical result is achieved in that the "Device for sealing the shaft of the screw of the furnace with bulk materials" consists of a screw shaft, a fixed sleeve and in the area of the seal the shaft is made with a sleeve of high strength material and has spiral grooves on the outer surface with a polished surface and ramps with angles that exclude self-jamming of the material in the grooves, namely less than 10 degrees, while the stationary sleeve has on the inner surface of the grooves with the direction of rotation in the opposite direction of the shaft direction, and these grooves also have a polished surface, and the slopes of the grooves have angles that preclude self-jamming of the material, and the direction of rotation of the shaft ensures that these two grooves extrude the material back into the furnace.

The drawing shows a "Device for sealing the shaft of the screw of the furnace with bulk materials."

The sealing device of the shaft of the screw of the furnace with bulk materials is made of the shaft of the screw (1), the fixed sleeve (2), characterized in that in the area of the seal (3) the shaft (1) is made with a sleeve (4) of high strength material and has on the outer surface (5) spiral grooves (6) with a polished surface and slopes (7) with angles that preclude self-jamming of the material (8) in the grooves (6), namely less than 10 degrees, while the stationary sleeve (2) has on the inner surface (9 ) grooves (10) with the direction of rotation in the opposite direction of the shaft direction a (1), and these grooves (10) also have a polished surface, and the slopes (11) of the grooves (10) have angles that prevent self-jamming of the material, and the direction of rotation of the shaft (1) ensures that these two grooves (6/10) extrude the material (8) back to the oven (12).

Material (8) moves with the screw shaft (1). Material (8) enters the cavity (13) between the shaft (1) with the sleeve (4) and the stationary sleeve (2). Partially fills the grooves (6/10) on the sleeve (4) and in the sleeve (2). The direction of rotation of the grooves (6/10) is the opposite. When the shaft (1) rotates, both grooves (6/10) try to squeeze the material (8) that has fallen into the cavity (13) back. With this oncoming movement of the material (8), the supply and extrusion pressures are equalized. The material (8) does not advance further into the cavity (13); a sealing plug (14) is created. This device will work as long as grooves (6/10) remain on the shaft (1) on the sleeve (4) and in the sleeve (2). When fully worn, replace the bushings (2/4). Thus, the ingress of air into the furnace (12) and precipitation of material (8) from the furnace (12) are excluded.

Technical and economic indicators are significantly higher than the prototype, because very high seal reliability and low maintenance cost.

Claims (1)

A device for sealing the shaft of the auger of a furnace with bulk materials, comprising a sealing sleeve, characterized in that in the sealing zone the shaft is equipped with a sleeve of high-strength material and has spiral grooves on the outer surface with a polished surface and slopes with angles of more than 10 ° to prevent self-jamming in the grooves of bulk material wherein said sealing sleeve has grooves with a polished surface on the inner surface, made with a direction of rotation opposite to that of the shaft thoron and ramps with angles, excluding the possibility of self-jamming of bulk material in the grooves, wherein the direction of rotation provides the squeezing particulate material back to the furnace.