Dispensing – With discharge assistant – Movable or conveyer-type trap chamber
Patent
1997-04-24
1999-06-22
Nguyen, Dean T.
Dispensing
With discharge assistant
Movable or conveyer-type trap chamber
162246, F16K 508, F16K 2500
Patent
active
059134585
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an apparatus for adjusting the axial position of a rotatable feeder in a charger housing relative to the charger housing in a charger for sluicing lignocellulose material and, if appropriate, cooking liquid or other treatment fluid from a first space, in which there is a first pressure, to a second space, in which there is a pressure different from the first pressure, which feeder has at least one outer surface of rotation which has the shape of a truncated cone which is intended essentially to bear against a surface of substantially corresponding conical shape in the charger housing, which apparatus comprises an adjustment housing which is connected immovably to the charger housing, an adjustment shaft which is connected to the feeder and is arranged so that it can be displaced in the adjustment housing in order thereby to move the feeder in an axial direction, and also means for executing the axial displacement of the adjustment shaft.
BACKGROUND TO THE INVENTION
In pulp mills, it is necessary to be able to sluice chips or other lignocellulose material, as well as cooking liquids or other treatment fluids, between lines or vessels which have different pressures. Thus, chips are sluiced via a so-called low-pressure feeder into a steaming vessel where a certain steam pressure is maintained, for example about 150 to 200 kPa. After the steaming, the chips and cooking liquid are sluiced via a high-pressure feeder into the high-pressure system of the digester, in which system a considerably higher pressure is maintained. A high-pressure feeder -- i.e. a sluice charger intended to be able to operate at high pressure differences -- of a conventional type is shown in FIG. 1 and FIG. 2. It consists of a charger housing 1 and a rotor or so-called feeder 2. The latter is divided into a number of compartments 3 for sluicing chips via an inlet opening 4 and cooking liquid through an inlet opening 5 to the pulp digester via an outlet opening 6. The shaft of the feeder is designated by 7. The feeder 2 has the general shape of a truncated cone, the circumferential surface of which is designated by 8. The latter is pressed against a correspondingly shaped surface 9 in the charger housing 1. As a result of the friction between the surfaces 8 and 9 upon rotation of the feeder 2 (the members for executing this rotation are not shown in the figures), the surfaces 8 and 9 become worn. The setting of the feeder 2 therefore has to be gradually adjusted by means of its being displaced axially relative to the charger housing 1. For decades now, various screw arrangements in adjustment apparatuses connected to one end of the feeder shaft 7 have been used for this adjustment. A common feature of these apparatuses is that they required relatively great force for manoeuvring them, and at the same time they provided only limited adjustment precision in many cases. Systems have also been developed for automatically regulating the position of the feeder. For example, Swedish published patent application 9300219-4 describes such an arrangement, but it does not touch upon the abovementioned problems.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to afford improvements to an apparatus of the type mentioned in the introduction. The invention aims in particular to afford an apparatus which does not require great manoeuvring force. Another aim of the invention is to afford an apparatus by means of which the feeder in a charger housing can be adjusted with very great precision. These and other aims can be achieved by virtue of the fact that a worm wheel is arranged on the adjustment shaft, inside the adjustment housing, and is coaxial with respect to the said adjustment shaft, that a shaft for a worm extends through the adjustment housing wall, that the worm is in engagement with the worm wheel in the adjustment housing, that turning members are arranged outside the adjustment housing in order to turn the worm and thus also to turn the worm wheel, and that means are arranged fo
Fasth Rolf
Kvaerner Pulping AB
Nguyen Dean T.
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