EP0718530B1 - Pump unit - Google Patents

Abstract

The pump unit has a pump propeller in a housing (15) with inlet and rear outlet branches. The propeller shaft (11) is sealed w.r.t. the housing by a sliding ring seal cartridge (20). Beyond the seal, the pump shaft is supported in a bearing unit and belt driven from a motor. The pump end of the seal housing (21) has an outer groove (23) in which a two or more section support ring (24) seats. The seal housing is supported against the pump housing by the support ring and held in place by a bolted tension ring (25, 26).

Description

The invention relates to a pump unit, in particular with a propeller pump, comprising a delivery pipe with a Pump propeller receiving suction nozzle and one behind it outgoing pressure connection as well as the propeller shaft their bearing supports, the Delivery pipe between the two nozzles on the pump shaft has concentrically surrounding seal housing, the one Mechanical seal in cartridge design for sealing the Record shaft passage, as well as with one on one Motor console arranged motor and a belt drive for Propeller pump drive.

Pump units of the type mentioned are known. You are suitable is particularly committed to promoting large production volumes comparatively low delivery heights. They are suitable preferred for drainage, drainage at construction pits and generally for lowering water, for example in civil engineering, Open-cast mining areas or as circulation pumps in evaporation or Crystallization plants.

Due to its design, a propeller pump is outside of it Conveyor tube a bearing bracket in the manner of a lantern with Spaced roller bearings for the propeller shaft.

A mechanical seal is located between these and the delivery pipe, which the pressure chamber of the pump opposite the bearing bracket and its rolling bearings seals. The sealing effect of this mechanical seal is known in the Way caused by slip rings, both against the medium and also seal against the atmosphere, leaving the space between the sealing rings of a barrier medium is applied, which lubricates and cools the Slip rings takes over. Nevertheless, this mechanical seal is a Wear part, which according to its stress in certain Intervals must be expanded and replaced with a new part.

Up to now, the replacement of the mechanical seal required a laborious, time-consuming and therefore considerably costly. To do this had to first remove the propeller to the front, then the engine in brought a relaxation position for the belt drive and this of the The pulley of the pump shaft. Then the Bearing bracket together with the pump shaft and the Mechanical seal pulled out of the seal insert, only then the actual removal of the mechanical seal and installation of a new one Mechanical seal could be made.

In FR-A-1.329.338 is a rotating union of a stationary Liquid line described in a rotating shaft. The Rotary union is sealed by axial mechanical seals, which are in a cylindrical mechanical seal housing are arranged rotatably. The Mechanical seal housing sits in a bore of the shaft and is from Clamping screws over a clamping ring and one in an external groove of the Mechanical seal seated support ring against a shoulder of the Drilled hole. In this way, the rotating union is simple to be replaced if the mechanical seals are worn.

The invention has for its object the type of a pump unit to improve with a propeller pump while avoiding the aforementioned difficulties when changing a mechanical seal this especially replace without dismantling the pump shaft and its drive to, by removing the mechanical seal housing in Direction of the propeller to be removed.

This object is achieved with the Features of claim 1 solved.

With great advantage, the design of the invention enables Removal of the complete mechanical seal including your Housing and the shaft sleeve after removing the propeller in Direction to the free end of the pump shaft. To do this first the clamping screws loosened and at least partially removed, so that the support ring from the circumferential groove can be pulled out, after which at least part of the Screwed in again and as a removal aid in the Senses are used that by unscrewing the Clamping rings with the help of the clamping screw nuts Mechanical seal housing together with the shaft sleeve pushed out of the centering collar of the pump housing at the front become. Now the mechanical seal can be removed from its housing removed and replaced with a new mechanical seal, after which the housing in the opposite direction through the sleeve is pushed through until the circumferential groove with the Centering collar is flush, after which the two-part or multi-part Support ring inserted into the circumferential groove and then the Clamping screws in the flange formed on the sleeve screwed in, then from above the clamping ring on the Mechanical seal housing placed on and after screwing on the nuts on the tensioning screws and tightened them the housing is clamped between the support ring and the clamping ring. The order the shoulders on the shaft sleeve, on which support rings for supporting Gaskets abut, allows easy removal of the removed Mechanical seals.

Further refinements are provided in accordance with the subclaims. The invention is selected in drawings based on a Embodiment shown, from which further essential details are recognizable.

Fig. 1

im Schnitt das vollständige Pumpenaggregat,

Fig. 2

im Schnitt eine Gleitringdichtung mit Gehäuse in eingebautem Zustand,

Fig. 3

im Schnitt eine Gleitringdichtung.

Show it:

Fig. 1

on average the complete pump set,

Fig. 2

on average a mechanical seal with housing when installed,

Fig. 3

a mechanical seal on average.

Figure 1 shows a pump unit with a propeller pump. This includes a Delivery pipe (1) with a suction nozzle that receives the pump propeller (10) (2) and a outgoing pressure connection (3) and a die Propeller shaft (11) with its bearings (12, 13) receiving bearing supports (14). The delivery pipe (1) has a between the two connecting pieces (2, 3) Propeller shaft (11) concentrically surrounding sleeve (15) in one Centering collar (16) together with a mechanical seal housing (21, 21 ') a shaft sleeve (22) arranged on the shaft (11). This is sealed against the shaft (11) by means of a sealing element (29, Fig. 2). With The advantage is the installation and removal of the mechanical seal housing (21, 21 ') facilitated by the fact that the installation space (40) surrounding the housing for example by a removable drip pan (41) for holding and Removal of any leaks that may occur can be.

On a pump housing (46) receiving the delivery pipe (1) is the bearing bracket (14) and next to or below on one Support unit (47) a motor console (43) with the motor (44) and a belt drive (45) for driving the propeller pump arranged.

As FIG. 2 shows in an enlarged partial representation, points the mechanical seal housing (21, 21 ') in the front or lower region (21) on a circumferential groove (23) into which a two-part or multi-part support ring (24) can be inserted with the the housing (21, 21 ') is supported axially, whereas it is from the other side by means of a clamping ring (25) for example four clamping screws (26) against the support ring (24) can be braced.

It can be seen that according to the above described removal of the mechanical seal housing (21, 21 ') this after loosening the clamping screws (26) and removing the Support ring (24) from the centering collar (16) to the front or removed below and stripped from the shaft (11) can. When pushing the housing part (21) out of a suitably tolerated fit in the centering collar (16) the clamping screws (26) can be used as an assembly aid. In front the housing parts (21, 21 ') are preferred for the support ring (24) only trained with a sliding fit, which is why the further expansion - and vice versa reinstallation - can be carried out easily.

An arrangement sees in the interest of a problem-free Remove the shaft sleeve (22) from the mechanical seal housing (21) propose that these end with Shoulders (30-32) is formed. Furthermore, the Shaft sleeve (22) from one into a circumferential groove (36) on it upper end clip-in securing element (37) like for example a snap ring or another Known specialist securing element, held axially and after its removal can be easily removed.

To facilitate the removal or reinstallation of the The mechanical seal can be taken so that the Mechanical seal (20) in two parts in the axial direction formed and each part (21, 21 ') with a connection hole (18, 19) is provided for rinsing liquid. One sees further Appropriate embodiment of the invention that the Tensioning screws (26) in one on the inside of the sleeve (15) formed flange (17), spaced apart in the circumferential direction, screwable and on the outer circumference of the parts of the support ring (24) are arranged adjacent. In this way they serve Clamping screws (26) at the same time for a secure hold in the Circumferential groove (23) used support ring (24) so that it No more seat and hold in the groove (23) Securing elements are more required.

In Figure 3, the mechanical seal (20) is in section shown. It comprises the housing (21), which on a End in the centering collar (16) of the sleeve (15) fitted and between the support ring (24) and the clamping ring (25) through the Screws (26) is clamped. Furthermore, the Mechanical seal (20) rotating with the shaft (11) Shaft sleeve (22) opposite the shaft (11) with the Sealing ring (29) is sealed at a snug fit. Between there are two pairs of slide rings in a two-stage arrangement (50, 51) and (52, 53), each as a pair of sealing rings interact with each other. Support the rings (50) and (52) each on support rings (54, 55), which in turn on Shoulders (60, 61) of the shaft sleeve (22) are held axially. The sealing rings (50, 52) rotate with the shaft (11), while the sealing rings (51, 52) in the housing (21) are non-rotatable are held. Between each pair of slide rings (50, 51) or (52, 53) are elastic sealing lips (56) and (57) arranged. The mechanical seal (20) thus consists of functionally well-proven individual parts and is as a result their two-tier arrangement compared to both Pumped medium from one side, as well as opposite The atmosphere from the other side is reliably tight.

With the design according to the invention, the replacement of the Wear part existing mechanical seal (20) essential facilitates and simplifies, reducing downtime and costs avoided or reduced.

Claims (4)

1. Pump unit, in particular with an axial-flow pump, comprising a delivery pipe (1) with an intake connection (2), which accommodates the pump propeller (10), with a pressure connection (3), which extends behind the connection (2), and with a bearing support (14), which accommodates the propeller shaft (11) with its mountings (12, 13), wherein the delivery pipe (1) comprises between the two connections (2, 3) a slide ring seal housing (21, 21') concentrically surrounding the propeller shaft (11) and accommodating a slide ring seal (20) in cartridge construction to seal off the shaft passage, and with a motor (44), which is disposed at a motor bracket (43), and a belt drive (45) for driving the axial-flow pump, characterised in that the slide ring seal housing (21, 21') of the slide ring seal (20) comprises in the region near the propeller a circumferential groove (23) in which a two- or multi-part support ring (24) can be inserted, which ring serves to axially support the slide ring seal housing (21, 21'), which can be clamped against the support ring (24) via a clamping ring (25) by means of clamping screws (26) from the side remote from the propeller, and that a shaft bush (22), which is disposed on the propeller shaft (11), is formed with shoulders (60, 61) rising from its end on the propeller side, against which shoulders engage support rings (54, 55) for supporting sealing rings (50, 52).
2. Pump unit according to claim 1, characterised in that the shaft bush (22) comprises at its end remote from the propeller a circumferential groove (36) for a securing element (37), e.g. for a retaining ring.
3. Pump unit according to claim 1 or 2, characterised in that the slide ring seal housing (21, 21') of the slide ring seal (20) is formed in two parts in the axial direction and each part (21, 21') is provided with a connecting bore (18, 19) for flushing liquid.
4. Pump unit according to one or more of claims 1 to 3, characterised in that the clamping screws (26) can be screwed into a flange (17) on the side of a sleeve (15) surrounding the propeller shaft (11) which is remote from the propeller so that they are distributed over the circumference of the sleeve and lie against the outer circumference of the parts of the support ring (24).

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