DE3303460A1 - SELF-PRIMING SIDE CHANNEL PUMP - Google Patents

Abstract

1. Self-priming lateral channel pump having a housing with an inlet opening (12), outlet opening (13) and incorporated lateral channels, having at least one impeller (32) with impeller cells which are arranged in at least two coaxial rings of cells or different diameters so that a flow medium reaches first the inner and then the outer impeller cells, while the lateral channel/channels directly connected to the outlet opening extend(s) completely over the impeller cells associated therewith and this/these lateral channel/channels (17, 17') is/are provided only over part of the circumference, whilst the inlet opening(s) of the lateral channel/channels associated with the inner impeller ring/rings is/are arranged in the near-axis portion and this/these lateral channel/channels (17, 17') is/are continued after (a) transitional opening(s) (19, 19') via (a) terminal secondary displacement channel/channels (20, 21'), characterized in that the lateral channel/channels (17, 17') connected to the inlet opening (12) of the housing extend(s) partially over the associated impeller cells (33, 33') in such a way that the portions of the impeller cells (33, 33') which are not overlapped, namely the near-axis portions, are sealed off by the the housing (16, 16'), whilst the transitional opening(s) (19, 19') of the lateral channel/channels (17, 17') associated with the inner ring/rings of impeller cells (33, 33') is/are arranged in the near-axis portion.

Description

PROF. DR. DR. J. REITSTOTtER.; * ORiWE'r ^ I? , KlNZEBACH DR. ING. WOLFRAM BUNTE * <ί _β " _β * _β -ι _β 7«)

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RIDER KILLER. KINZEBACH β. PARTNER POSTPACH 7βΟ. D-βΟΟΟ MUNICH 43 PATENT LAWYERS APPROVED REPRESENTATIVES AT THE EUROPEAN PATENT OFFICE EUROPEAN PATENT ATTORNEYS

SUBJECT: RE

TILEPON: (OBB) 2 71 OS 03 TELEX: 0621020 «ISAR D BAUERSTRASSE 22. D-βΟΟΟ MUNICH -4O

Munich, February 2, 1983

OUR FILES: OUR REP:

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Friedrich Schweinfurter

Bergstrasse 6 8541 Röttenbach

Self-priming side channel pump

JJUJ40U

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The invention relates to a self-priming side channel pump 5

pe, which is suitable for generating high pressures with a large suction lift at the same time.

Side channel pumps are suitable for achieving high pressures, their vane cells at least axially, in addition

are often also radially open and to which side channels are assigned, which completely open the vane cells cover. In this way there is an optimal energy transfer through the exchange of momentum from the faster circulating Shovel fluid possible at the slower volume flow in the side channel. Furthermore, one respects To achieve high pressures, ensure that the volume flow conveyed in the side channel when entering and exiting into or experiences as little change in direction as possible from the side channel. For this one leads the entrance and in particular

dere the outlet immediately at the beginning or end of the side channel in the circumferential direction to the outside. The sensitivity against contamination of the pumped medium and the loss of pressure due to the inward flow of the pumped medium

this can be reduced or avoided, others-25

on the one hand, however, this measure of direct connection makes the side channel pump self-priming lost, as no liquid ring displacing the sucked in air can form after the

Liquid-30 present in the pump from the initial filling

is immediately discharged when it is started up again.

There are special designs of side channel pumps known, where the direct connections of suction and

Pressure connection through lateral, i.e. axially arranged 35

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Connections are replaced to provide an immediate self-priming capability come close However, this arrangement significantly worsens the efficiency of the pump, the suction and venting times of such pumps are nevertheless very long.

From DE-OS 30 14 425 a special version of a side channel pump is known in which the vane cells are provided in an alternating length to the impeller hub, so that shorter and longer (in the radial direction seen) alternate blade cells. This age-

The long vane cells are faced by a side channel with a decreasing cross-section, which is at its beginning the long and the short, but at its end only covers the short blade cells. By Although this construction is the air conveyance of the side

The sewer pump has been improved, but the suction and venting times are still quite long. Furthermore lead the long suction times, especially with long suction lines, to a. Heating up the defects can. In addition, it is due to the warming

the vapor pressure of the liquid necessary for the self-priming process inside the pump increases, which is a This leads to a decrease in the suction height that can actually be achieved.

From US-PS 23 21 810 a self-priming centrifugal pump is known, the rotor of which has two impeller rings having. Opposite the outer bucket wheel rim is a self channel that completely covers the bucket cells, which is directly connected to the pressure port of the pump. This outer side channel is the same as with peripheral impeller pumps common knowledge, only about part of the

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Circumference out and has at its "inlet end on an overflow channel with an inner, the inner Blade cells associated housing space is connected.

Although this known pump has a certain ability to self-prime, the suction height that can be achieved with this arrangement is limited. In addition, is
the achievable pressure at the pump outlet is relatively low,
since the outer pressure stage is only subject to a low pressure

¹ ^ ben will.

Based on the above-mentioned prior art, it is the object of the present invention to design a directly self-priming side channel pump in such a way that ^ ® a high energy transfer coefficient (pressure figure) is achieved with good efficiency and self-priming behavior, i.e. short suction and venting times.

This object is achieved by a pump according to the main claim, further preferred embodiments result from the subclaims.

In the case of the present pump, the impeller is arranged in a structural unit with both a star-shaped one Blade cells, with long ones, starting from the impeller hub and extending in the circumferential direction Blade cells and with at least one larger diameter, preferably double-sided blade cell ring formed with axially or axially and radially open blade cells and short blades. Here are

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the star-shaped inner vane cells either in axially open continuously on both sides,

or separated from one another by a central wall 5

educated. Opposite the vane cells are side channels each with an interrupter, which form the long Only partially cover the blades in the direction of the hub and completely cover the short blade cells.

The inner blade ring with associated side channels, which acts as a liquid ring "precursor" is, in a further preferred embodiment, that according to the invention Pump several pumping stages connected in series from vane cells and completely covering them Side channels with interrupters upstream. The following blade rings are therefore gradual arranged in the impeller with increasing diameter, which results in a particularly compact design with a very large final delivery head and still good suction

cautious results.

The construction according to the invention has the advantage that by combining the. Conveying elements one immediately self-priming liquid ring side channel

pump is produced with the conveying elements of a considerably better in efficiency and pressure number, but not self-priming side-channel system in a construction unit, a particularly compact, material-saving high-pressure pump with good self-priming and good ^and efficiency. Since all pumping elements are arranged on only one impeller, the adjustment of the impeller in the housing is by far not as critical as in the case of the usual multi-stage pumps with an upstream suction stage to achieve the pressure figure achieved here. In addition, the

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inventive design of the pump an improvement in the efficiency compared to conventional pumps in particular achieved in that the inner side channel pump working as a liquid ring pump is multi-stage in this Designed as a feeder pump, the volume flow entering through the inlet opening in the housing at a relatively low flow rate is pre-accelerated promotes to the next stage rotating at greater peripheral speed. That way will the acceleration shock that would otherwise lead to considerable losses when the blade enters the "pressure stage" reduced to a minimum.

Further features of the pump according to the invention result can be derived from the following description, which is explained in more detail with reference to exemplary embodiments and drawings are. Here shows

Figure 1 is a longitudinal section through a preferred

Embodiment of the pump according to the invention along the line I-I from FIG. 2.

FIG. 2 shows a cross-section through the pump according to FIG. With the impeller and dash-dotted lines dashed overflow channel,

Figure 3 is a plan view of the impeller according to the figures 1 and 2,

FIG. 4 shows a section through the impeller according to FIG. 3 along the line II-II from FIG. 3,

^u Figure 5 is a plan view of one of the side channel parts of the pump according to Figures 1 and 2,

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FIG. 6 shows a section through the side channel part Figure 5 along the line III-III,

FIG. 7 shows a longitudinal section through a further preferred embodiment with an inner cell ring on one side and double-sided pressure stage,

FIG. 8 shows a longitudinal section through the impeller of the pump according to FIG. 7 along the line IV-IV Figure 9,

FIG. 9 shows a plan view of the impeller of the pump according to FIG. 8,

FIG. 10 shows a longitudinal section of a further preferred one Design of the pump with one-sided preliminary stage and double-sided pressure stage,

FIG. 11 shows a section through the impeller of the pump

according to FIG. 10 along the line VV
Figure 12,
FIG. 12 shows a plan view of the impeller of the pump

Figure 11,
25th

FIG. 13 shows a top view of a further preferred embodiment of an impeller with both sides open vane cells of the preliminary stage and double-sided, axially open vane cells

the pressure stage with dash-dotted side channels and inlet / outlet openings,

Figure m shows a section through the impeller
Figure 13 along the line VI-VI,

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Λ *.

FIG. 15 shows a plan view of the impeller of a further preferred embodiment of the pump with double-sided paddle cells of the preliminary stage and separated by a central wall several subsequent, double-sided pressure stages with axially and radially open vane cells and side channels indicated by dash-dotted lines with inlet / outlet openings,

FIG. 16 shows a section through the impeller
Figure 15 along the line VII-VII,

FIG. 17 shows a plan view of an impeller of a further preferred embodiment of the pump Double-sided vane cells of the preliminary stage, separated from one another by a central wall and several subsequent, double-sided pressure stages with axial and axial / radial open blade cells and side channels indicated by dash-dotted lines with inlet / outlet openings, and

FIG. 18 shows a section through the impeller
Figure 17 along the line VIII-VIII.

The preferred embodiment shown in FIGS the pump according to the invention shows a double-flow side channel pump with a liquid ring preliminary stage and consists of a housing 10 and an impeller 32. The housing 10 is constructed in several parts and consists of a housing ring 11 with inlet opening 12 and outlet opening 13, one at the end Gohäusedeckel 14, a drive-side bearing cover. 15 and the two side channel parts 16 and 16 '.

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In the side channel parts 16 and 16 'are the precursors 5

Side channels 17 and 17 ', the preliminary stage inlet openings 18 and 18', the preliminary stage outlet openings 19 and
19 ', post-displacement channels 20 and 20' with vent holes "21 and 21 ', transfer channels 22 and 22', pressure level side channels 23 and 23 ', pressure level inlet openings 24 and 24', pressure level outlet openings 25 and 25 ', as well as interrupters 26 and 26' arranged.

The housing cover 14 and the bearing cover 15 are sealed in the housing ring 11 by round cord rings 27

and screwed to the housing ring 11 with housing screws 42.

In the bearing cap 15 of the housing 10 is one over

Packing rings 29 sealed shaft 30 mounted which

by a drive motor (not shown), for example an electric motor, in the direction of the arrow
(Figure 2) is set in rotation. The impeller is on the free end of the shaft 30 by means of a feather key 31

32 attached.
25th

The two-stage impeller 32 consists of star-shaped arranged blade cells 33, the blades 34 for reinforcement have a roof-shaped back and form the impeller preliminary stage, as well as from the axial and radial

open blade rings 35 and 35 ', which form the impeller pressure stage.

The rotating vane cells 33 of the impeller preliminary stage form one from the liquid content in the housing Liquid ring which fills the annular precursor side channel 17 and at the same time the vane cells 3 3

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to the impeller circumference. When the encircling

Blade cells in the area of the start of the side channel 5

reach, a part of the vane cell contents belonging to the liquid ring is caused by the centrifugal force pushed into the side channel 17. "The liquid ring thus moves away from the impeller hub and sucks in air through the precursor inlet opening 18. Through the

steady increase in pressure in the side channel 17, caused by the exchange of momentum between the liquid content of the vane cells 33 and the volume flow in the side channel 17, liquid from the side channel 17 is in the vane cells 33 pushed back. This will make the

Air trapped in the hub area of the blade cells 33 is compressed. At the end of the side channel 17 is through a post-displacer 20 tapering flat in the axial direction, the liquid inevitably enters the vane cells 33 pushed back, causing the compressed air

is pressed through the vent hole 21.

The air delivery, i.e. the self-priming process, continues until the suction line and the inside of the pump are vented. In the immediately following The liquid is conveyed through the inlet opening 12 in the housing 10 and the preliminary stage inlet opening 18 in the preliminary stage side channel 17 entering volume flow through an energy transfer Momentum exchange between the blade cells

33 circulation flow formed by centrifugal force has a higher energy state and the volume flow is lower Energy state in the side channel 17- The conveying medium flows through the side channel 17 from the start of the side channel up to its outlet opening 19 and passes through the transfer channel 22 into the inlet opening 24

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and thus into the pressure stage side channel 23. When flowing through the pressure stage side channel 23, a occurs further energy supply or pressure increase through the exchange of impulses between the vane cells 38 and the volume flow in side channel 23. At the end of the side channel 23 goes directly into the connected outlet opening 25 in the housing 10, so that the volume flow does not experience an abrupt change of direction.

Another preferred embodiment is shown in FIGS the pump according to the invention shown. In this pump, the preliminary stage pumping cells are 33

of the impeller 32 on one side, that is, single-flow, and 15th

arranged open in the axial direction. The pressure equalization between both sides of the impeller 32 takes place through Pressure equalization bores 40 which are only made in a part of the vane cells 33. At this

Embodiment are the inner blades 34 with the 20th

Impeller end face arranged in alignment or flush, as is also the case with the embodiments according to the figures 1 to 6 has been shown.

In a further preferred embodiment of the invention Pump stand, as shown in Figure 10, the inner blades 34 from the impeller 32, with which they are integrally connected, protrude and are open in both the axial and radial directions. Of them

The side channel assigned to gQ accordingly comprises the inner vane cells in the radial direction partially, in the axial direction completely. This way is another Increase in the efficiency of the pump can be achieved. In the present case, the inner stage is only single-stream formed, but a two-stream design is also possible.

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Further details of the impeller emerge from Figures 11 and 12, in which the roof-shaped stiffeners of the inner vanes 34 are shown.

In Figures 13 and 14, the impeller of a further preferred embodiment of the pump according to the invention is shown. Here, the inner vane cells 33 are designed to be open on both sides, with side channels lying opposite them on both sides. The subsequent pressure stage is formed by the vane cells 38 and 38 'with associated side channels, these outer vane cells 38 and 38' only in the axial direction
are open.

Further preferred embodiments are shown in FIGS. 15 to 18 the pump according to the invention is shown by means of its impellers. The impeller according to Figures 15 and

16 has inner walls separated by a central wall 36

Blade cells 33 and 33 ',' which are flush with the impeller 32. The inner vane cells 33 and 33 'are followed by two further pressure stages 38a, 38b and 38'a, 38'b, which are also connected in series.

The vane cells of the pressure stages are designed to be radially and axially open, opposite them are the appropriately shaped, the vane cells completely overlapping side channels arranged. In the embodiment of the pump according to FIGS. 17 and 18,

The previously described embodiment was different from the first pressure stage with only axially open vane cells 38a, 38'a formed.

The depth and arrangement of the vane cells of the various vane cell rings will be as required Funding conditions selected accordingly, as well

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the one or two-stream training of the various Pressure levels.

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Claims (7)

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M / 24 008 Claims (1.) Self-priming side channel pump with a housing with inlet opening, outlet opening and incorporated side channels, with at least one impeller Blade cells that are coaxial in at least two
10 Blade cell rings of different diameters are arranged so that a pumped medium is first to the inner, then to the outer vane cells, the / which is directly connected to the outlet opening (n) side channel (s) completely covers / cover the vane cells assigned to it / them, characterized in that
the side channel (s) (17, 17 ') connected to the inlet opening (12) and assigned to it / them th vane cells (33,33 ') partially covered / covered in such a way, that the not covered, namely near-axis sections of the blade cells (33,33 ') from Housing (16,16 ') are sealed, and this / these Side channel (s) (17, 17 ') only over part of 25 of the circumference is / are provided, the inlet opening (s) (18, 18 ') and the outlet opening (s)
(19,19 ') of the inner vane cell ring
- wreaths (33.33 ') associated side channel / side channel- nails (17, 17 ') are arranged in the section near the axis 30th and this / these side channel / side channels (17,17 ') after the outlet opening (s) (19, 19 ') via (a) expiring post-displacement channel (s) (20, 20')
associated, axially close outlet opening (21,21 ') is / are continued.
35 Μ / 24 007 J2 - ** · * ·· - · - · 2. Side channel pump according to claim 1, characterized in that the axially close vane cells (33) in the axial Direction through the impeller (32).
5 3. Side channel pump according to claim 1, characterized in that the axially close vane cells (33,33 ') through a wall (36,37) of the impeller (32) are closed on one side in the axial direction, the wall (36,37) is preferably perforated by some pressure compensation bores (40). 4. Side channel pump according to one of the preceding claims, characterized in that the near-axis viewing cell (33,33 ') with the impeller (32) in the axial Finish flush with direction. 5. side channel pump according to one of claims 1 to 3, characterized in that the axially len (33) in the axial direction from the impeller (32) step-shaped arranged protruding and are open in the axial and radial directions. 6. Side channel pump according to one of the preceding claims before, characterized in that the axially close vane cells (33,33 ') with side channels (17,17') several gradually increasing in diameter, preferably double-sided pressure stages with vane cells 38a, 38'a, 38b, 38'b) with the corresponding them entirely overlapping side channels (23a, 23b, 23'a, 23'b) are connected in series. 7. side channel pump according to one of the preceding claims, characterized in that the outer
Vane cells (38,38 ', 38a, 38b, 38'a, 38'b) radial,
are optionally also axially open.