DE202023103491U1 - Arrangement of a mechanical seal on a motor/pump shaft - Google Patents

Abstract

Arrangement of a mechanical seal on a motor/pump shaft in a bearing cover (1), which includes the counter ring (5) of a mechanical seal within a lantern (10), the counter ring (5) of the mechanical seal being connected to a mechanical ring (6) of a mechanical seal of a spiral housing (11) of the pump works together in that they slide on top of each other as a pairing, and a liquid can be filled into the receiving space (7) of the bearing cover (1), which wets the surface between the seal ring-counter ring pairing (5,6) in a film-like manner.

Description

TECHNICAL FIELD

In the case of a vacuum pump, in particular a dirty water pump, the invention relates to the arrangement of a mechanical seal on a motor/pump shaft in a bearing cover, which includes the counter ring of a mechanical seal within a lantern, the counter ring of the mechanical seal interacting with a mechanical seal of a mechanical seal of a spiral housing of the pump, in that these slide as a pair lying on top of each other, and a liquid can be filled into the receiving space of the bearing cover, which wets the surface between the sliding ring-counter ring pairing in a film-like manner.

The invention therefore relates to an arrangement of a mechanical seal in a vacuum pump, which counteracts premature wear and thus pump failure. The arrangement is used in particular in vacuum pumps for feces and other wastewater (so-called dirty water pumps).

BACKGROUND

The actual pump, more precisely its volute casing, is connected to a motor, preferably an electric motor, via a lantern and is driven in the volute casing by a mounted motor shaft that is guided into the pump.

The connection of the motor shaft with the pump units and their bearings is sealed by a variety of seals so that the liquids to be pumped cannot get into the electric motor. The bearings and thus also the seals are closed by a bearing cover.

If the pump is not operated for a longer period of time and/or strong disinfectants have been used, cold welding processes can occur when the sealing surfaces of seals lie on top of each other, which can lead to the seals being destroyed when the pump is started up again.

This is particularly the case with a seal pairing consisting of a fixed counter ring and a rotating seal ring of a mechanical seal, as is often used in the transition from the spiral housing to the lantern and, for example, in the axial piston machine according to DE 32 33 579 will be shown.

DESCRIPTION OF THE INVENTION

One object of the invention is to propose an arrangement for such seal pairings that largely eliminates such wear without significantly changing the structure of the pump.

This task is solved with the features of claim 1; Advantageous refinements are the subject of the subclaims.

The arrangement of a mechanical seal on a motor/pump shaft in a bearing cover, which accommodates the counter ring of a mechanical seal within a lantern, whereby the counter ring of the mechanical seal interacts with a mechanical seal of a mechanical seal of the spiral housing of the pump, in that they lie on top of each other as a pair, that a liquid can be filled into the bearing cover, which wets the surface between the sliding ring and counter ring pairing in a film-like manner.

The liquid is introduced into the receiving space for liquid via a bore system embedded in the bearing cover, the bore system being closable to the outside. A screw plug with a seal is preferably used for this purpose.

In a preferred embodiment, the bearing cover has an offset rotating phase on the inside wall, so that a radial shaft seal can be arranged centrally here, which closes the bearing cover on the motor side. On the other side, the bearing cover rests on the lantern and is sealed by the seal ring-counter ring pairing. The liquid introduced cannot escape from the receiving space under normal operating conditions, but rather wets the seal ring-counter ring pairing in a film-like manner.

The preferred liquid is an oil or a water mixture. It will be clear to the person skilled in the art that other suitable film-like wetting liquids are also conceivable.

The radial shaft seal is preferably arranged in such a way that its sealing lip presses more heavily on the motor/pump shaft when pressure builds up through the pump as a result of wear on the seal ring-counter ring pairing due to lack of or poor maintenance. The pump can thus be operated for a very limited time, namely until the radial shaft seal is worn out and therefore permeable.

A control hole in the lantern indicates this dangerous condition by visibly leaking pump fluid.

In a further advantageous embodiment, the phase is used to arrange the outlet opening for the liquid from the bore system into the receiving space of the bearing cover.

In an advantageous embodiment, the drilling system consists of two holes brought together in the bearing cover, with the phase providing an optimal area for a drill attachment.

CHARACTERS

• 1 das Motor-Pumpengehäuse im Schnitt und
• 2 die Laterne mit Kontrollbohrung.

The invention will be explained with reference to the drawings. Show it:

• 1 the motor pump housing in section and
• 2 the lantern with inspection hole.

1 shows the arrangement of a mechanical seal on a motor/pump shaft in a bearing cover 1, which includes the counter ring 5 of a mechanical seal within a lantern 10, the counter ring 5 of the mechanical seal interacting with a mechanical seal 6 of a mechanical seal of the spiral casing 11 of the pump by acting as a Mating lie on top of each other. The counter ring 5 is fixed and the sliding ring 6 can rotate.

In the bearing cover 1, i.e. H. the receiving space 7 of the bearing cover 1, a liquid is filled in, here oil, which wets the surface between the sliding ring-counter ring pairing 5.6 in a film-like manner.

The oil is introduced into the receiving space for liquid via a bore system embedded in the bearing cover 1, the bore system being closable to the outside. A screw plug 3 with a seal is preferably used for this purpose.

The bearing cover 1 has a separated rotating phase on the inside wall. The shoulder serves to centrally arrange a radial shaft seal 8, which closes the bearing cover 1 towards the engine side. On the other side, the bearing cover 1 rests on the lantern 10 and is sealed via the sliding ring-counter ring pairing 5.6.

The sealing lip of the radial shaft seal 8 is arranged in such a way that when pressure builds up through the pump as a result of wear on the seal ring-counter ring pairing 5.6 due to lack of or poor maintenance, it presses more heavily on the motor/pump shaft. The pump can thus be operated for a very limited time.

Furthermore, embedded in the phase is the outlet opening for the oil from the bore system into the receiving space 7 of the bearing cover 1 for the oil.

The phase also serves as a suitable attack surface for the drill, which is perpendicular to the drill.

The drilling system itself consists of two holes in the bearing cover 1 that merge into one another.

2 shows the lantern 10 with inspection hole 9. As described above, the sealing lip of the radial shaft seal 8 is arranged in such a way that when pressure builds up through the pump as a result of wear on the seal ring-counter ring pairing 5.6 due to lack of or poor maintenance, it is reinforced Motor/pump shaft presses. This prevents dirty water from leaving the receiving space 7 for a certain time; namely until the sealing lip of the radial shaft seal 8 is destroyed. The dirty water can then penetrate towards the engine via the angular contact ball bearing 2, which supports the motor shaft. This dangerous condition is indicated by the inspection hole 9, where dirty water emerges.

With the invention, a significantly longer service life of the vacuum pump is achieved through the special design of a bearing cover 1 for sealing purposes.

REFERENCE SYMBOL LIST

1

Bearing cap

2

double row angular contact ball bearing

3

Oil filler plug

4

O-ring of the mechanical seal

5

Mechanical seal mating ring (fixed)

6

Mechanical seal slide ring (rotating)

7

Storage space in the bearing cover for liquid

8th

Radial shaft seal

9

control hole

10

Lantern

11

Spiral casing

1. 1. Anordnung einer Gleitringdichtung auf einer Motor-/Pumpenwelle in einem Lagerdeckel (1), der innerhalb einer Laterne (10) den Gegenring (5) einer Gleitringdichtung umfasst, wobei der Gegenring (5) der Gleitringdichtung mit einem Gleitring (6) einer Gleitringdichtung eines Spiralgehäuses (11) der Pumpe zusammenwirkt, indem diese als Paarung aufeinander liegend gleiten, und eine Flüssigkeit in den Aufnahmeraum (7) des Lagerdeckels (1) einfüllbar ist, die die Fläche zwischen der Paarung Gleitring-Gegenring (5,6) filmartig benetzt.
2. 2. Anordnung nach Ausführungsform 1, dadurch gekennzeichnet, dass die Flüssigkeit über ein in den Lagerdeckel (1) eingelassenes Bohrungssystem in dessen Aufnahmeraum (7) für Flüssigkeit eingebracht ist und das Bohrungssystem nach außen hin verschließbar ist.
3. 3. Anordnung nach Ausführungsform 1 oder 2, dadurch gekennzeichnet, dass der Gegenring (5) der Gleitringdichtung fest und der Gleitring (6) rotierend angeordnet sind.
4. 4. Anordnung nach einer der Ausführungsformen 1 bis 3, dadurch gekennzeichnet, dass der Lagerdeckel (1) innenwandig eine abgesetzte umlaufende Phase aufweist, so dass hier eine Radialwellendichtung (8) zentrisch anordenbar ist.
5. 5. Anordnung nach Ausführungsform 4, dadurch gekennzeichnet, dass die Radialwellendichtung (8) den Lagerdeckel (1) zur Motorseite hin abschließt.
6. 6. Anordnung nach Ausführungsform 4 oder 5, dadurch gekennzeichnet, dass die Radialwellendichtung (8) derart angeordnet ist, dass deren Dichtlippe bei einem sich durch die Pumpe aufbauenden Druck verstärkt auf die Motor-/Pumpenwelle drückt.
7. 7. Anordnung nach einer der Ausführungsformen 4 bis 6, dadurch gekennzeichnet, dass sich in der Phase die Austrittsöffnung für die Flüssigkeit in den Aufnahmeraum (7) befindet.
8. 8. Anordnung nach Ausführungsform 2 oder 7, dadurch gekennzeichnet, dass das Bohrungssystem aus zwei im Lagerdeckel (1) zusammengeführten Bohrungen besteht.
9. 9. Anordnung nach einer der Ausführungsformen 1 bis 8, dadurch gekennzeichnet, dass die Flüssigkeit ein Öl oder Wassergemisch ist, insbesondere ein Maschinenöl ist.

In light of the aforementioned disclosure, the invention further includes the embodiments numbered below:

1. 1. Arrangement of a mechanical seal on a motor/pump shaft in a bearing cover (1), which includes the counter ring (5) of a mechanical seal within a lantern (10), the counter ring (5) of the mechanical seal being connected to a mechanical ring (6) of a mechanical seal a spiral casing (11) of the pump works together, in that these slide as a pair lying on top of each other, and a liquid can be filled into the receiving space (7) of the bearing cover (1), which wets the surface between the sliding ring-counter ring pairing (5,6) in a film-like manner.
2. 2. Arrangement according to embodiment 1, characterized in that the liquid is introduced into the receiving space (7) for liquid via a bore system embedded in the bearing cover (1) and the bore system can be closed to the outside.
3. 3. Arrangement according to embodiment 1 or 2, characterized in that the counter ring (5) of the mechanical seal is fixed and the sliding ring (6) is arranged rotating.
4. 4. Arrangement according to one of embodiments 1 to 3, characterized in that the bearing cover (1) has a stepped circumferential phase on the inside wall, so that a radial shaft seal (8) can be arranged centrally here.
5. 5. Arrangement according to embodiment 4, characterized in that the radial shaft seal (8) closes the bearing cover (1) towards the motor side.
6. 6. Arrangement according to embodiment 4 or 5, characterized in that the radial shaft seal (8) is arranged such that its sealing lip presses increasingly on the motor/pump shaft when the pressure builds up through the pump.
7. 7. Arrangement according to one of embodiments 4 to 6, characterized in that the outlet opening for the liquid into the receiving space (7) is in the phase.
8. 8. Arrangement according to embodiment 2 or 7, characterized in that the bore system consists of two bores brought together in the bearing cover (1).
9. 9. Arrangement according to one of embodiments 1 to 8, characterized in that the liquid is an oil or water mixture, in particular a machine oil.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3233579 [0006]

Claims (9)

Arrangement of a mechanical seal on a motor/pump shaft in a bearing cover (1), which includes the counter ring (5) of a mechanical seal within a lantern (10), the counter ring (5) of the mechanical seal being connected to a mechanical ring (6) of a mechanical seal of a spiral housing (11) of the pump works together in that they slide on top of each other as a pairing, and a liquid can be filled into the receiving space (7) of the bearing cover (1), which wets the surface between the seal ring-counter ring pairing (5,6) in a film-like manner. Arrangement according to Claim 1 , characterized in that the liquid is introduced into the receiving space (7) for liquid via a bore system embedded in the bearing cover (1) and the bore system can be closed to the outside. Arrangement according to Claim 1 or 2 , characterized in that the counter ring (5) of the mechanical seal is fixed and the sliding ring (6) is arranged rotating. Arrangement according to one of the Claims 1 until 3 , characterized in that the bearing cover (1) has a stepped circumferential phase on the inside wall, so that a radial shaft seal (8) can be arranged centrally here. Arrangement according to Claim 4 , characterized in that the radial shaft seal (8) closes the bearing cover (1) on the motor side. Arrangement according to Claim 4 or 5 , characterized in that the radial shaft seal (8) is arranged in such a way that its sealing lip presses increasingly on the motor/pump shaft when pressure builds up from the pump. Arrangement according to one of the Claims 4 until 6 , characterized in that in the phase the outlet opening for the liquid is located in the receiving space (7). Arrangement according to Claim 2 or 7 , characterized in that the bore system consists of two bores brought together in the bearing cover (1). Arrangement according to one of the Claims 1 until 8th , characterized in that the liquid is an oil or water mixture.

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