FR2526768A1 - ARCHIMEDE SCREW PUMP WITH SCREW MOUNTED IN A BEARING OF TWO SIDES - Google Patents

Abstract

PUMP CHARACTERIZED IN THAT THE OUTLET SAS 2 IS MADE IN THE SHAPE OF A SPIRAL 4 ON THE CROSS SECTION OF THE PUMP. THE INVENTION APPLIES TO ARCHIMED SCREW PUMPS FROM WHICH THE MATERIALS EXIT TOWARDS THE CENTER OF THE SCREW, WITH A CHECK VALVE AND AID OF COMPRESSED AIR.

Description

1.- "Archimedes screw pump whose screw is mounted in a bearing of

two ctés "

  The invention relates to a screw pump of Ar-

  chimed having a screw fixed by a bearing of both c 8 tees and a check valve in the exit chamber of

  bulk materials to be transported pneumatically

  intended to bring the material in bulk

a transport pipe.

  Screw pumps are usually used to

  introduction of bulk materials which must be

  transported in pneumatic conveying

  that it is necessary here to make the airlock tight with respect to the difference in pressure between the transport pipe and the environment is known flying screw pumps and others in which the screw

  conveyor is fixed on both sides.

  In a pump where the shaft of the screw is fixed at both ends, it is necessary to separate the material

  see the exhaust pipe Comm Z it is the most

  part of the difficult time of drifting bulk materials to

  the compressed state, a significant energy expenditure is

  This expense is lower with a fixed screw of only one side. The pumps where the screw is fixed at both ends, such as those of patent DE 24 56 476, have the advantage that the screw 2.- is m-them fixed and gives more security The invention has

  consequently, to remove the resistance

  additional bulk material that manifests itself

  when you have to push out pump materials where the screw is fixed at both ends. For this purpose, the invention proposes that the airlock is made in the form of a spiral, if we look in the direction of the cross section of the pump.

  Under these conditions, the outlet temperature of the pump is very small.

  However, the closure member of the airlock is also very small, and as a result, the frictional losses that occur during the exit remain limited to a minimum. The outlet opening of the spiral airlock is rectangular and is closed by a check valve placed obliquely to the direction of transport, as tight as possible around the circumference of the screw. A particular advantage is that a rectangular check valve closes the outlet opening

  spiral, and is, when it is open,

  parallel to the axis of the connection of the transmission line.

  port and fold, to reach the position of iron-

  meture, on an angle that is less than 90.

  After the check valve in the direction

  of transport, is connected according to a particular characteristic

  of the invention, at the exit chamber, a chamber of

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  permeable material to which they are subjected

  In this way, the carrier gas can be sent on the material transported from all sides of the rectangular outlet of the pump, so that the material arriving from the box of the screw is sufficiently loosened Due to the shape

  of the pump outlet, one can call upon, as

3.-

  loosening rooms at rectangular sintered

or to tissues.

  If the transport length is short,

  can pass all the air used for trans-

  Porous walls can be used Both sintered plates and fabrics with different air permeabilities can be manufactured, so that it is possible to adapt to the amount of air required for transport. In case it is necessary to have a

  more air for transport, additional air

  necessary for this purpose may be brought by means of an

  The annular nozzle placed between the airlock and the transport pipe An annular nozzle of this kind can be both polygonal and round. If necessary, it is also possible to use an annular nozzle whose air slot

be variable.

  To further improve the output of the material

  re to transport the box of the screw by the spiral-shaped outlet airlock, it is possible to mount on the shaft of the target, in the area of the outlet orifice, at least one curved wing There may be advantage, depending on the size and the capacity of the screw, to provide here a wing as well as several These wings will be advantageously put in particular in the screw pumps with two screw entries and in the screws in rotation in opposite directions The airlock of exit

  can be set up both in a position-out

  only in any other direction of trans-

  port, therefore, even vertically upwards, or under a

  whatever the case, so that according to the circumstances,

  in these circumstances, it is possible to economize

of the transport pipe.

  It is particularly advantageous to

  the outlet airlock, in its upper zone, as a negative form of the check valve, so that this 4.-

  Lapet disappears when it is open The flapper itself

  same shape when it is open the upper wall of the airlock

  The two fasteners of the flap lever pin-

  the check valve will be advantageously placed eccentrically, and thus facilitate the adjustment of the clutch.

  pet compared to a good quality sealing surface

  between the check valve and the airlock.

  If at least the part of the outlet airlock realized as a form is made permeable to air

  negative pressure of the check valve, it will be avoided during

  thanks to a partial amount of air that passes through

  In this zone, this space receives material in the form of dust, and hinders the mobility of the check valve. In screw pumps where the screw is fixed at both ends and has only one inlet

  screw, it is possible to mount in the outlet

  mentally, on the shaft of the screw, a disc whose

  meter corresponds to the passage of the screw and which presents on

  its back side, an extra wing narrow, curved.

  The result is that the cable gland in front

  the terminal fixation of the screw is not directly

  the total pressure of the transported material.

  This wing, the disk and the wing of the ar-

  can also be firmly connected with the latest

  re turn of the screw, that is to say to the end turn of the screw, and can therefore be quickly changed,

  wear parts and to be mechanically installed on the

the screw.

  The invention will be better understood with regard to

  the following description and the accompanying drawings represent

  as an exemplary embodiment of the invention, drawings in which: FIG. 1 represents the exit lock in cross-section,

  Figure 2 shows the screw and the airlock

  section in longitudinal section, Figure 3 shows the airlock with

  the curved wings, in cross section.

  The bulk material is pushed, with the aid of the screw 1, into the airlock 2 until it is formed in the airlock 2, a leakproof cap of material to be transported, the valve of hold 3 emp 9 gives the shock in return of the air used for transportation from the

  transport line on the conveyor screw to the

delivery of material to be transported.

  In the exit lock 2, the material to be trans-

  The spiral-shaped wall 4 and the curved wing 5 facilitate this work of deflection. Under the outlet orifice 2 of the shaft of the screw 1, it is additionally mounted. a disk 11 having the diameter of the passage of the screw and which bears on its

  rear side an additional wing 5, narrow, curved.

  In FIG. 1, it is also possible to see the check valve 3 in the open state and it clearly appears that the surface 6

  of the check valve 3 in the open state is identical to that

  The air arrives through the upper porous wall 7 both in the space behind the check valve and in the space.

  intended for transport Transport air comes exclusively

  by the other walls 8 and 9, permeable to air, in

  the transport pipe If the air requirements for trans-

  port are particularly large one can send under pres-

  additional air in the transport line

by the annular nozzle 10.

6.-

Claims (7)

  1. Archimedean screw pump having a screw (1), fixed at both ends and a check valve   (3) in the airlock of bulk material transporta-   pneumatically, intended to send the material in bulk in a transport pipe, pump characterized in   the airlock (2) is designed in the form of spira-   (4) on the cross section of the pump.   Screw pump according to Claim 1,   characterized in that the exit orifice of the air lock chamber rale (4) is rectangular.   3. Screw pump according to claim 2,   characterized in that a check valve (3), rectangular,   close the exit port of the lock chamber (2) in a spiral (4),   when it is open parallel to the axis of the   rope of the transport pipe, and folds   the closing position on an angle which is less than at 90.   4. Screw pump according to claim 1, characterized in that it connects, at the airlock (4), a ventilation chamber whose inner walls (7, 8, 9)   are made of a material that is permeable to air,   to which at least some of the air is blown on the transport.   Screw pump according to Claim 4, characterized in that between the airlock and the pipe   of transport, an annular nozzle (f 0) is placed.   b. 1 ompe vs buivan the reveraicatlon, characterized in that, in the area of the L (2) spell hole, is mounted on the shaft of the screw, at least one wing curve (5).   7. Screw pump according to claim 3, characterized in that the airlock (2) outlet, in its upper zone, a negative form of the check valve (3), so that it melts in this form 7.- when he is open.   8. Screw pump according to Claim 7, characterized in that the axis of the lever of the valve (3) is placed eccentrically.   9 screw pump according to claim 7, characterized in that at least a portion (7) of the negative form for the valve (3) retaining in the airlock outlet is permeable to air.   Screw pump according to Claim 6, characterized in that a disc (11) having the diameter of the passage is additionally mounted in the outlet opening (2) of the screw shaft (1). of the screw, and which carries on its rear surface (5) an additional wing, narrow, curved.