DE1528862A1 - Sewage pump or the like. - Google Patents

Description

Dr. K. R. EIKENBERG

Dipl.-Ing. S. LEINE

PATENT LAWYERS

3 HANNOV ER * c

Am Klageimarkt 10 / n 15.

STENBERG-PLYGT AB
SOLNA / Sweden

Waste water pump or the like.

The invention relates to a pump for waste water, pulp suspensions o _e the like .. In particular, in wastewater stations and pits are angesammalt the waste water of a large number of residential houses. Due to the location of the same, it may not be possible for the sewage to drain into the general sewer system, e.g. if the connection pipe of a residential building is below the level of the sewer system or if sewage is to pass through an elevated section of the site. In such cases, pumps are usually used that are specially designed for sewage. These have, among other things, a large channel cross-section in the pump wheel so that impurities can pass through freely

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The composition of the sewage is very different, and this is especially the case when an industry is connected to the sewage station. The most common contaminants are cleaning wool, nylon stockings, rags and the like. Under unfavorable conditions, these can cause malfunctions due to clogging of possibly existing narrow sections of the pumps. . '

In order to make the pumps cheap and light, it is important to reduce the size of the unit. There the pump unit has to be installed in a large space, to avoid the risk of clogging, it remains only to reduce the size of the motor part. Just this kind of pump which are mostly set up in damp rooms or sunk in water, the motor is completely encapsulated and has no ventilation, which is why the heat is lost through the walls of the motor housing to the surrounding air or the water has to be drained

About the size of the cooling surfaces and thus the motor To press down, the motor housing can with water or be cooled in other ways. This can be done by putting water on the motor housing using a Mantle, which encloses the same, or by submerging the pump in the water so that the latter reaches up to the motor housing.

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You can also use cooling water through the motor housing let trickle.

When pumping sewage with pumps submerged in it, sufficient cooling is obtained if the water level in the sewer shaft is regulated and the shutdown level of the pump is set so high that part of the motor housing is still under water. However, it is not always possible to keep the water level as high as is necessary for effective cooling of such pumps lowered in the water. This is the case, for example, with pools with a very large surface. Sufficient cooling is also not obtained if the pump is set up dry in a special room away from the sewer shaft.

The cooling of the LIo gate housing can also be done by sprinkling with water, if a separate well or the like. is available. A connection to the water supply network is generally not permitted unless special safety measures are taken which, however, do not guarantee reliable cooling , namely if, for example, the tap water is turned off or a separate cooling water pump goes on strike.

J) Le present invention aims at 00981 7/0571 above

to eliminate the disadvantages mentioned by the fact that the pumped Medium is used to cool the engine, which is passed into a separate cold room. The invention consists mainly in that between the upper peripheral edge of the pump wheel and the part of the pump housing adjoining this at the same height the edge of the impeller is formed with a sealing gap for filtering the wastewater to be used for cooling. The mentioned cooling water space - in the following "cooling water end space" called - is thus supplied cooling water free of impurities. When pumping sewage there is a high risk of narrow channels becoming muddy or blocked by solid objects. Through the invention However, the water is freed from major impurities and can then be stored in the cooling chamber circulate, which makes it possible to use the wastewater for cooling.

According to a further embodiment of the invention, the pump wheel is on its rear side in order to achieve it a certain back pressure on the cooling chamber side during start-up and for cooling water circulation with auxiliary shovels Mistake.

Another further development of the invention is characterized in that the motor housing of the pump has a cooling jacket surrounding the same and the cooling water jacket space formed between the motor housing

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and cooling jacket is provided with a cooling water inlet, .der to the arranged between the pump wheel and the pump cover Cooling water end space is connected in the vicinity of the pump impeller circumference. The cooling water outlet is in provided near the impeller hub.

The invention is now attached to the following Drawing in more detail "describes which one embodiment of the invention shows.

In the embodiment shown, the motor housing 1 is mounted on a pump housing. The engine. housing 1 is enclosed by a cooling jacket, which for example from a separate part with e.g. weak can exist conical shape and is attached to the outside of the motor housing 1. The cooling jacket 2 instead be cast in one piece with the motor housing.

The pump housing 5 has a large flow cross-section This also applies to the impeller 6, which is driven via the motor shaft 19. Above the Pump wheel 6 and between the same and the motor shield or pump housing cover 18 is a cooling water end space for cooling the cover or motor shield 18 and -des the pump wheel facing bearing of the motor arranged

To achieve a certain back pressure in the cooling water end space 17, the pump wheel 6 is provided with blades 8 on its rear side, thereby preventing that

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Impurities and solid objects or textiles through the between the upper edge of the pump wheel 6 and the adjoining, upwardly standing edge flange of the pump housing 5 formed sealing gap penetrate and clog it or care about the Be able to wind the impeller "

In the lower part of the motor housing 1 channels 3 are arranged, which are connected to channels 4 in the pump housing 5 are that the cooling water from the top of the impeller 5 through the cooling channel © 3 and to the cooling channels 7 circulates. This circulation takes place in that the pump wheel 6, as already mentioned, on its The back is provided with blades 8 »The cooling channels 7 are connected in series and run in such a way that the inlet of the same on the circumference of the impeller is where higher pressure prevails, and the outlet from the same in Center area 9 of the impeller is where lower There is pressure. There are several partition walls in the shell space 10, which, as already mentioned, form channels 7, which run vertically in the exemplary embodiment shown and through openings 11 in communication with the adjacent Canal stand.

To prevent contaminants from entering the cold rooms get is between the impeller 6 and the

^: ■■ "■■■" ■ "■ ■■" / ■ "'■""■" 1 & ■. "■■ Pump housing 5 a gap seal' arranged. The same is shaped so that the sides 13 of the channel openings

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at the pump wheel 6 protrude over the inner wall 14 of the pump housing by expediently making an annular attaches annular flange protruding from said wall 14, wherein the solid particles are thrown past the gap opening and washed out with the water from the pump housing 5- will. The cooling jacket 2 is above and below with warts 15 respectively. 16 with threads and screwed in Provide plugs · The latter can be used for rinsing, for example of the cooling system can be unscrewed, for example when an overhaul of the pump or a repair necessary is·

By dividing the luantel cold room into one A number of meandering cooling channels are obtained a relatively high water flow rate and clogging of the cooling channels by sludge deposits is prevented, .

The flow rate of the cooling water can by directing the cooling water inflow in the sense of a Spiral line around the cooling jacket can be further increased

Possibly between the underside of the impeller and the bottom of the pump housing are also blades be attached to the pump wheel and connecting lines between the cooling water space thus formed and the inlet and drain channels of the Kantel Kühlraumes be arranged, as indicated with dashed lines,

The arrangement works in the following way: 009817/0571

When the pump is started, the water comes above the pump wheel 6 through the inlet of the paddle The back of the pump wheel rotates and is fed into the cooling channels 4, 3 and 7, further through openings 11 pumped to the next cooling channel, etc., to then through the Outlet 17 to get back to the center 9 of the pump wheel. The cooling water brushes on the back of the cooled impeller 6 along and flows back into the cooling channels 4, 3 and 7 β In addition, an exchange takes place of cooling water at the gap 12 acting as a filter, by forming several channels with a relatively small cross section a high cooling water flow rate is obtained and prevents particles from settling in the channels and entrains the air that is initially in the Upper part of the cooling ducts is enclosed * Practical studies have shown that any air can pass through the gap 12 is pumped out into the pump housing and that the entire cold room fills quickly with water.

If, for example, when pumping pulp or the like. If sufficient separation of the particles is not achieved, the cooling water jacket space can instead be used for an additional Forced cooling can be used by replacing the cover 18 with a cover without duct openings · Man can also move the cover so that the duct openings hidden by the detail above or below will. The duct openings can also be made with plugs

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close with any elastic material so that a additional cooling can be achieved in that lines for coolant are connected to the warts 15 and 16 «This version can also be used when pumping warm liquids.

If the pumped medium can be diluted, additional cooling can also be used, whereby Cooling liquid is connected to the warts 15 or 16 then flows through the gap seal to the pumped medium. This version is also useful if the dilution is to be mixed well into the medium to be pumped.

In the embodiment described, the pumping continuously without the engine getting too warm, regardless of whether the pump is submerged in the water or not",

Although the invention has been described in connection with an embodiment thereof, the same can also refer to can be modified in any way within the scope of the following claims. ...........

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Claims (1)

Patent applica sp rüche Waste water pump ο, the like · with a connection to the Pump cover or the wall between the pump and the drive motor arranged cooling water end space, thereby characterized in that between the upper peripheral edge of the impeller and which is attached to the same adjoining part of the pump housing in the amount of Impeller edge a sealing gap for the supply of all impurities, mainly free cooling water is formed for the said cooling water end space. 2,) Sewage pump according to claim 1, characterized in that that the pump wheel to achieve a certain counter pressure in the sealing gap on its upper side is provided with auxiliary blades 3 ·) Sewage pump according to claim 1 or 2, characterized in that the motor housing with a same surrounding cooling jacket is provided and that the thereby formed cooling water jacket space between the Motor housing and the cooling jacket with a cooling water inlet is provided, which is in the vicinity of the impeller circumference between the pump wheel and the pump cover arranged cooling water end space is connected, as well as with a cooling water outlet near the Pump wheel hub 00981770571 4 ·) Sewage pump according to one or more of the preceding Claims / characterized in that the cooling water end space by a with the pump cover mainly parallel wall with an annular opening around the drive shaft of the pump in one, close of the impeller lying upper cooling water end space part with higher pressure and a lower part of the cooling water end space near the cover with lower pressure Pressure is split, 5.) Waste water pump according to claim .4-, characterized in that that the water inlet to the cooling water jacket space on the lower cooling water end space part and the water outlet is connected to the upper cooling water frontal part, 6.) Waste water pump according to claim 3, 4 or 5 _t, characterized in that the outlet of the cooling water jacket space is arranged in its upper part. 7 ·) Sewage pump according to one or more of the preceding Claims, characterized in that the cooling water jacket space in order to achieve a high Cooling water flow speed through vertical bars in a series-connected, meandering shape running cooling channels is divided " 00 96 l 7 / 0S7 8 ·) Sewage pump according to one or more of the claims 3 -7, characterized by #ass the cooling water inlet is directed in the sense of a spiral line running around the cooling jacket 9 ») Sewage pump according to one or more of the preceding claims, characterized) that also the lower edge of the impeller β with a gap seal is provided 10 ·) Sewage pump according to one or more of the preceding Claims, characterized in that also the underside of the impeller with auxiliary blade is provided 11.) Sewage pump according to one or more of the claims 3 - 10, characterized in that an between the underside of the pump wheel and the bottom of the pump housing formed cooling water space with the cooling water inlet of the cooling water jacket and its cooling water outlet is connected to lines, of which the line connected to said inlet starts from a point in the sewing of the periphery of the pump wheel8, while the one connected to the outlet Line opens out in the area of the pump end 00 98 1 7/0571