FI82854B - SAENKPUMP. - Google Patents

Abstract

The submerged pump has a motor fixed by flange (2) to its housing (3), which contains a rotary impeller (4). The shaft works in mechanical slipring-type seals, the lower one of which (7) is in contact with the liquid handled, while the upper one seals the housing off from the stator chamber. A guide (1) between flange and housing delivers barrier fluid to the lower seal, owing the seal housing end face as far as the impeller hub. USE/ADVANTAGE - Submerged pump can handle liquid presenting problems from the sealing point of view.

Description

82854

SUBMERSIBLE PUMP - STACK PUMP

The present invention relates to a submersible pump comprising a motor 5 mounted via a flange to a pump housing in which an impeller is rotatably arranged, the shaft bushing of which is sealed by mechanical O-ring seals, one of which, the lower one, is in direct or indirect contact with the pumped liquid and the second, upper 10, seals the bushing between the oil-filled seal housing and the static grate.

The lower seal is lubricated and cooled in part by the oil in the seal housing and in part by the fluid to be pumped. If the fluid to be pumped is abrasive, adhesive, thick or otherwise such that the fluid does not fulfill its lubrication / cooling function, these functions must be provided by an external seal sealing fluid.

20 The use of a sealing liquid is not in itself new in dry-mounted pumps, which, due to their design, have no problem in directing the sealing liquid into the sealing space.

In submersible pumps, it is difficult to direct the sealing fluid to the sealing seal because the fluid must be led to the lower seal through an oil-filled seal housing. This will increase the potential for leaks in the engine, which must be absolutely tight. Another disadvantage is that the motor has to be built differently from the standard motor. Often, the space in the seal housing is also limited and, consequently, the pipe required to conduct the sealing fluid cannot be led through the seal housing.

The object of the present invention is to provide a device for guiding a sealing liquid to a lower seal, by means of which device the range of use of submersible pumps can also be extended to pump liquids which are problematic for 2 82854 seals. The submersible pump according to the invention is characterized in that a partition wall is arranged between the motor flange and the pump housing for conducting the sealing fluid to the lower seal, which partition tiivistysraoksi.

10

An advantage of the invention is that certain types of submersible pumps can be equipped with a seal sealing system without making changes to the standard motor that compromise its reliability, as well as allowing the sealing fluid to be used when the pipe required for the sealing fluid cannot be built due to space constraints.

In the following, the invention will be explained in detail by means of a preferred exemplary embodiment with reference to the accompanying drawing, in which the figure shows a part of the vertical section of a submersible pump according to the invention.

The shut-off fluid device 1 according to the invention is fastened between the motor flange 2 and the pump housing 3. The device extends to the hub of the impeller 4, following the shape of the end face of the sealing cover. The hole in the center of the device 1 and the cylindrical surface machined on the hub of the impeller 4 are fitted as a cylindrical sealing gap. From the outer circumference of the device through the opening 5 and through the gap between the seal housing and the device 1 the sealing liquid 6 is pumped out.

By arranging the dimensioning of the cylindrical sealing gap and the amount of sealing fluid to suit, a pressure is higher in the sealing space 6 of the lower seal 7 which is higher than in the liquid to be pumped on the outside of the space. Thus, the sealing liquid prevents the pumped liquid harmful to the seal from entering its seal.

It will be clear to a person skilled in the art that the invention is not limited to the above-mentioned exemplary embodiments, but can be varied within the scope of the appended claims.

Claims (1)

4,8854 CLAIMS Submersible pump comprising a motor mounted via a flange (2) to a pump housing (3) rotatably arranged with an impeller (4), the shaft bushing of which is sealed by mechanical mechanical seals, one of which, 7, lower , is in direct or indirect contact with the pumped liquid and the second, upper, sealing passage between the oil-filled seal housing and the stator chamber, characterized in that a partition (1) is arranged between the motor flange (2) and the pump housing (3) for conducting sealing fluid to the lower seal (7), which partition wall (1) extends from the outer circumference of the pump to the hub of the impeller (4), following the shape of the end face of the seal housing, and that the hole in the center of the partition wall (1) and the cylindrical surface machined to the impeller hub (4) are cylindrical. i 5 82854 Sänkpump försedd med en motor, som med hjälp av en fläns (2) 5 är fast vid pumphuset (3) fi vilket finns ett roterande löp-hjul (4), rod axelgenomforing är tätad med Mekaniska Glid-ringstätningar, varav en , in which case (7), directly or indirectly in contact with the scattering of the wood and the other, Övre, this genome-forming Melian is oil-filled and 10-fold and stator drum, turns to the flange (2) and pump (3) ) finns en mellanvägg (1) som leder spärrvätskan account den nedre tätningen (7) och feljer tätningshusets ändyta ta attellanväggen (1) när frän pumpens periphereri account löphjulets (4) nav, och att coalit 15 i mellanväggens (1) Centrum och bearbetade cylindriska ytan pä löphjulets (4) nav har anpassats sä att de bildar en cylindrisk tätningsspalt.