DE1528889A1 - Arrangement for restoring the suction capability of a pump - Google Patents

Description

DIPL-GHEM. DR. WERNER KOCH 'DR.-ING. RICHARD GLAWE DIP L. -1N G. K L A U S DE LFS DIPL-PHYS. DR. WALTER MOLL HAMBURG MÖNCHEN

2000 Hamburg 52 · WallrttraBe 12 -Ruf 892255 8000 MOnch'en 22 · lltbh.rritrafle 20 · Kuf 225548

L. \ YOUR MESSAGE FROM ,8th -J YOUR SIGN Corporation OUR SIGN D / Bl. REGARDS: P 15 28 889. Worthington

HAMBURG

Arrangement for restoring the suction capacity of a pump

The invention relates to an arrangement for restoring the suction capacity of a pump, the suction opening of which is located in a recessed line part and the pressure side in a higher than this line part
Lying chamber opens into the outlet opening of which a normally closed, but automatically opening when liquid is pumping, first valve is provided and which is connected to the recessed line part via a return channel in which a normally open,
however, a closed second valve is provided when pumping liquid, a bypass line with a check valve for the gas leading from the suction side of the pump to the chamber.

p * 2 ■■

909885/0478

A known arrangement of this type (USA patent 3 O78 8O6) is prone to failure because the valves selected there are a very must have precisely coordinated functions · The operating · » properties of the valves can also change over time

The invention is therefore based on the object of creating an arrangement of the type mentioned at the outset in which both valves show absolutely uniform way of working.

The solution according to the invention is that the second valve is designed as a slide and that the first and the second valve are arranged essentially perpendicularly one above the other coaxially and their valve members are rigidly connected to one another by a rod, being returned to their normal position by gravity are crowded.

The chamber, the first and the second valve advantageously represent a component that belongs together outside the pump It is also useful if the mouth of the pressure port of a pump with a horizontally lying shaft in the chamber is so far above the bottom is that that is below the mouth The chamber volume located is sufficient for the amount of liquid to restore the suction capacity of the pump, if it is after Opening of the second valve flows back to the pump

The invention provides a pump arrangement through which automatically and at the same time the exchange of penetrated into the suction shaft Air takes place against pumped medium that is already

909865/0478

the pump has run through »loss of time due to pump ineffectiveness after loss of their absorbency does not occur · There is also no separate intervention by an operator required · The invention has the further advantage that the Device for restoring the suction capacity of the pump is not an integral part of the pump, but rather is separate from it and is therefore easily accessible for single-part work or repairs «

The invention is explained in more detail below with reference to Drawing explained, which represents advantageous exemplary embodiments of the invention · It show ι

Fig. 1 is a partially vertically sectioned side view of a Pump system with vertical pump in working position ι

Pig 2 a section along line H-II of Pig. If

Fig. 3 shows the devices for restoring the suction capability the arrangement according to FIG. 1 in the manner required for this Position; and

Fig. 4 is a partially vertically sectioned side view of a Pump system according to the present invention with a horizontally arranged pump «

By the present invention, liquid is in the suction. shaft and the gas is discharged in exchange for liquid coming from the pressure side of the pump.

909885/04

Ea it was found that functionally interconnected valves, those under the action of pressure loss related to a vent valve to remove the gas from the suction Well working on the pressure side of the pump can serve to achieve this goal «In this way pumps get steadily and automatically the absorbency immediately after their ' Loss so that the entire system works with high efficiency *

1, 2 and 3 show a pump system according to the invention with a vertical centrifugal pump 60, with a plurality of stages 61 and a vertical shaft 62 which is connected to a drive motor for the pump is connected

The pump 60 has a suction port 64, the liquid from a suction duct 65, which is surrounded by an outer housing 66 is formed, which is completely closed, apart from the connection points with the connecting line 67, which with the is in contact with the medium to be pumped by the system

Sucked into the suction opening 64 of the pump from the suction shaft 65. Liquid is passed through channels 68 in the individual stages from stage to stage and flows through the outlet opening of the pump and the connecting channel 70 to suitable lines which bring the liquid to a point intended for storage or consumption »

At its lower end, the pump has a nozzle 61 which up to the end of the empty container f

BATH ORIGINAL

or the suction shaft 65 protrudes "so that the pump its suction capacity does not lose until practically all the liquid has been sucked out of the suction shaft

This type of pumps and suction sumps is used for draining water Known to ships or containers * One of the main problems in the use of these and other types of pumps is that then, when larger amounts of air are sucked in from the connecting line 67 and discharged at the pump system, the supply is reduced by liquid »0 that the liquid in the Suction shaft 65 is sucked very quickly, whereby the liquid level drops below the suction opening 64 and the pump loses its suction capacityThe suction lift is no longer sufficient to initiate the liquid delivery again until the suction opening or the first stage is submerged again

According to the present invention works with the pump and the Suction shaft a device together that the absorbency the pump automatically restores the flow of liquid can be reinstated »

This device comprises the one shown in FIGS. 1, 2 and 3 Example of a housing 72 which is marked with the upper end of the outer housing 66 is connected and which forms a chamber 73 which is connected to the end of the connecting channel 70 dea pressure port the pump communicates

The chamber 73 provides a reservoir for the pumped liquid and is at the same time a passage channel to an Aualaft-

Ö018S5 / 0478

opening? 4, which is connected to the outlet pipe 75, which The housing 72 via the outlet opening 74 according to FIGS. 1 and 3 the drawing is attached

The flow through outlet port 74 is from the outlet port valve 77 controls how. is described in more detail below: The liquid then reaches the outlet line 75 and on to a further supply or consumption point

The chamber 73 is also provided with a return opening 78, which is substantially aligned with the outlet opening 74. One Return line 79ι with one end through the opening 78 with the housing 72 and connected at the other end to the upper end of the outer housing 66 via the return outlet 80 is - is able to return liquid from the chamber 73, when the return valve generally designated 81 opens.

The recirculation valve or second valve 81 comprises a cylindrical one Valve housing and a valve holder 82 which are in the housing are arranged and are connected via the return opening 78 0 «· The valve body and the bracket 82 have a number of circumferentially arranged valve openings 83, the liquid flow from the chamber 73 ia housing 72 to the return opening? 8 allow when they are open · The openings 83 are kept open or closed by means of a valve head 84, the is arranged to slide along the inner wall of the cylindrical valve housing and the bracket 82 for the valve stem.

909885/0478

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ORIGINAL INSPECTED

As can be seen from FIG. 3, the valve head 84 has a Ring part 85 «of the connection hub 86 via struts 87 is connected so that when the valve head is in the lower open position moves the liquid out of the chamber through the openings 83 and the valve head 84 to the return opening 78 can flow

Bas valve 84 is opposite the return line -78 under the Outlet opening? 4 arranged so that it bit these openings and the first or exhaust valve 77 is substantially in line. As a result, these valves can use a common valve stem 88, the one end to the first valve 77 and * b the other end to the part 86 of the second Valve 81 is connected. The valve stem 88 is supported by the supports 89, 90 which are arranged at a distance from one another are.

If the pump system does not work or if the pump is running Loses suction, the valves automatically take the position shown in Fig, 3 of the drawing due to gravity one, i.e. the first valve 77 is closed and the second Valve 81 is open.

If the pump delivers enough, the pumped liquid will hold the valve 77 open · Because the valves are isolated on one The valve stem is seated, the valve stem pushes it "Waiters valve B1 upwards, so dcß <aie Yenii! Openings 83 be completed. ·

SÖ9885 / CH78

The beneficial results sought by the invention are achieved in that the accumulated air or gas from the suction duct 65 with in the reservoir or the chamber contained liquid is exchanged

This is achieved by means of a vent line 91, <the between the upper end of the outer housing 66, which is the suction duct 65 forms, and the upper part of the housing 72 is provided is. A pressure-dependent check valve 92, which is shown schematically indicated in line 91 allows gas flow from the suction port 65 to the upper part of the chamber 73. The chamber has sufficient capacity so that the liquid contained therein is sufficient to produce the pumping speed of the pump 60, if it takes the place of the gas in the suction shaft, as described in more detail below

How the pump system works with a vertical pump »

When the pump is not operating, see the first valve 77 and the second valve S1 in that shown in FIG Location.

A sufficient amount of liquid is supplied to the suction shaft 65 supplied so that when the motor 63 is turned on, the pump 60 with the liquid delivery through the outlet port 69 to chamber 73, which is connected to it via channel 70 is, begins as described above «

When the liquid in the suction shaft is drawn down, the pressure in it decreases, removing liquid from the tank

BATH ORIGINAL

or the reservoir is drawn in through the connecting line 67, so that the liquid level in the suction shaft is maintained and the pumping process can continue

The liquid flows out of the chamber 73 when the pressure is high enough to open the first valve 77. This will the second valve 8l automatically closed and closed held until the pressure of the pumped liquid drops to

This latter circumstance occurs when a large air or Amount of gas accumulates or is conveyed from the transition line 67.

Such an accumulation of gas causes the pump to work in the Suction nozzle 65 to quickly suck off remaining liquid) the Pump no longer submerges in liquid and runs empty As a result, the fluid pressure drops and is no longer sufficient to keep the first valve 77 open. Gravity closes the first valve 77 automatically and at the same time opens the second valve 81. "? ..

When the valve 8l opens, the liquid collected in the chamber 73 flows through the port 83, the return port 78 and the Return line 79 through the return port 80 into the suction shaft back, where it replaces the gas filling this suction shaft. It displaces the accumulated air and gases through the vent line 9I and the valve 92, which is at a opens a predetermined pressure difference. ,

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152888a

Air and gas are in the upper part of the chamber 73 in the: *; Space previously occupied by the liquid in it · Thus, the gas in the. Suction shaft 65 against the Liquid in the chamber 73 exchanged.

If there is a sufficient amount of liquid, the pump system automatically restores its suction capacity " This lowers the liquid level in the suction shaft 65 again * This increases the pressure - just as at the start of the pumping lowered in the suction shaft and liquid is drawn in from the storage container (not shown) through the connecting line 77.

As long as only a little liquid is supplied from the connecting line 67, the pumping processes and the processes of the alternate between self-restoring absorbency until all liquid is removed from the tank or the vehicle is withdrawn.

Another embodiment of the invention;

Fig. 4 shows a pump system according to the invention with a horizontal one Centrifugal Pump · A housing defining a chamber 11 is connected to the pump outlet 12. The connecting line extends into the chamber 11 by such a length that the capacity the chamber below the level of the mouth of the line 13 for sohriel liquid is sufficient that the absorbency the pump can be restored when this fluid flows back to the suction port channel 10 of the pump. To this

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909885 / Ö478; Ws

Purpose is the tip 14 of the line 13 above the calibrated Bottom 15 of the chamber 11. A first valve 17 is between the first line 16 and the chamber 11 arranged. The first valve 17 is normally closed when the pump is not operating is, and opens when pumping. If the pump fails » power closes the valve 17. A second line 18 extends from the bottom of the chamber 11 to the suction chamber 10 and. forms a return line for pumped medium from the Chamber 11. Between the chamber 11 and the second line 18 there is a second valve. This valve 20 is normally closed · It is operational via a pole 21 or other suitable means are connected to the first valve 17. When the first valve 17 as a result of the lack of pump performance closes, the second valve 20 is simultaneously and, 'Opened automatically via the connecting rod 21. On the other hand, if the pump pressure, the first valve 17 due to the in the Line 16 of the printed medium opens, the second valve opens caused by the lifting of the valve 17 over the rod 21, to close the wide line 18.

If enough gas _f accumulated on the suction side of the pump (intake chamber 10) so that the jPumpenleistung fails, the mere recirculation of liquid from the chamber to the suction chamber 10 Ii must be accompanied by the venting of the pump. For this purpose a third line 23 leads from the pump 22 to the upper part of the chamber 11 * In this line there is a third valve. The third valve 24 is normally closed when the pumped medium flows through the chamber. This valve opens

/ Ml Q

depending on the gas pressure · The air that has penetrated the pump escapes into the chamber 11 from the pump 22 _f while the liquid in the chamber 11 returns to the suction opening IO of the pump 22 «The coupled function of the first and second valve in the return of the pumped medium to the suction inlet chamber 10 together with the end ventilation via the valve have thus automatically restored the suction capacity of the pump due to the failure of the pump output.The coupled valves 17 and 20 are essentially coaxial and are jointly due to the pump output or gravity via the connecting rod 21 actuated.

The above description is only illustrative of embodiments of the invention · changes in construction, selection and arrangement of the elements can be used without deviating from the inventive concept in

Within the scope of the following claims

909885/0478 ι

Claims (3)

PATENT CLAIMS l \ arrangement for restoring the absorptive capacity of a pump, the suction opening is located in a recessed disposed conduit portion and the pressure side opens into a raised against this line section lying chamber, in whose outlet opening for the flow, a normally closed, but automatically opening in fluid delivery, first valve is provided 'and which is connected to the recessed line part' via 'a' return channel in which a normally open, but closed second Vetttil- is provided when pumping liquid, whereby from the suction side the pump leads to the chamber a bypass line with a non-return valve for the gas, characterized in that the second valve (81) is designed as a slide and that the first (77) and the second valve are arranged essentially perpendicularly one above the other and their valve members by a Rod (88) are rigidly connected to each other, whereby they are heavy force are forced into their normal position. 2. Arrangement according to claim 1, characterized in that the Chamber, the first and the second valve represent an associated component outside of the pump. - 14 - ; ■ - ■ -..-. * i .; pr: ί 909885/0470 3. Arrangement according to claim 1 or 2, characterized in that that the mouth of the pressure port (13) of a pump with a horizontally lying shaft in the chamber (11) so far above the bottom is that that is below the The chamber volume located at the mouth is sufficient for an amount of liquid to restore the suction capacity of the pump, if this after opening the second valve (20) flows back to the pump 909885/0478 Blank if e