WO2010077157A1

WO2010077157A1 - A tank for a sewage pumping station

Info

Publication number: WO2010077157A1
Application number: PCT/PL2009/000111
Authority: WO
Inventors: Marek Haas; Jan Haas; Zbigniew Stachowicz; Krzystof Wierzbicki
Original assignee: Inwap Sp. Z.O.O.
Priority date: 2008-12-30
Filing date: 2009-12-28
Publication date: 2010-07-08

Abstract

A tank has a jacket (1) made of plastic, it is situated along a vertical axis, whereas in its lower part it has a wet chamber (2), in its middle part above an inlet orifice (6) it has a reserve chamber (3) and a hatchway (4) in its upper part. The wet chamber (2) narrows conically downwards, and the reserve chamber (3) has form of a cylinder (5). The cylinder (5) has stabilizing ridges (7) shaped in planes perpendicular to the axis of the tank, while the surface of sewage in the wet chamber (2) finds itself in the lowermost ridge (7) of the cylinder (5) which is connected with a conical jacket (8) to a lower conical container (9) of the tank, whereas the container (9) has a stabilizing ridge (7') and a bottom (10) reinforced by a cross shaped head (11). Above the lowermost ridge (7) of the cylinder (5) in the jacket (1) there is formed a longitudinal bulge (13) perpendicular to the planes of the ridges (7), in which there is situated the inlet orifice (6). The ratio of a nominal diameter (D) of the cylinder (5) of the tank to the smallest diameter (d) of the wet chamber (2) around the bottom (10) fulfils the condition 1,5 ≤Dd≤ 2,5, whereas the ratio of the biggest diameter (d') of the conical container (9) to the diameter (d) around the bottom (10) fulfils the condition 1,1 ≤d'd≤< 1,3. The height (h) of the wet d chamber (2) is so arranged that the ratio of the nominal diameter (D) of the cylinder (5) of the tank to the height (h) fulfils the condition 1,3 ≤Dh≤1,7.

Description

A TANK FOR A SEWAGE PUMPING STATION

The object of the present utility model is a sewage tank for a sewage pumping station in a pressure sewage system.

Tanks used in pressure sewage systems up till now have form of a cylinder made of reinforced concrete, narrowing along its upper part, in which there is installed a flooding apparatus in form of a pump connected with a conduit to an outlet stub pipe through a system of a cut-off and a non return valve, while in an orifice in a wall of a tank there is situated an inlet conduit. Such construction of a tank is known for example from a description of Polish utility model No. 56600, while in Polish patent description No. 195590 there is shown a sewage tank consisting of concrete coils placed successively on one another and provided properly with orifices spaced radially. Next in a description of Polish utility model No. 48113 there is presented a cylindrical tank of a sewage pumping station made of steel and . in a description of Polish utility model No.56580 there was presented a tank made of plastic and its thin side wall is girdled with a strengthening spiral hoop, the bottom coil of which is immersed in concrete in order to protect a pumping station from buoyant force of underground water pushing the station upwards towards the surface. Also tanks for collecting sewage are known, while in a description of Polish utility model application No. W-115138 there was presented a cylindrical reinforced concrete tank of a vertical axis, narrowing along its upper part and in Polish utility model application No. W-114706 there was shown a four-segment plastic tank of a horizontal axis provided with reinforcing bulges, whereas neighbouring segments are provided with collars and joined with screws. A similar tank was presented in a description of Polish utility model No. 63205. Moreover in a description of Polish utility model No. 58780 there is presented a tank for collecting sewage, of a horizontal axis, made of plastic in form of two parts - an upper and a lower one, glued together along tongues situated in a plane of the horizontal axis of the tank along its entire perimeter. The tank has a shape of an ellipse in its cross-section, and its outer surface is covered with ridges in form of waves shaped as rounded off trapezoids. Next from Polish patent description No. 199556 it is known a device for storing liquids, for example sewage, in form of a plastic tank consisting of two similar parts each of them having horizontal ridges and ridges encircling lower and upper part and both parts are connected in excavation site during placing the tank.

The object of the present utility model is a construction of a tank for a pumping station, especially in a pressure sewage system, the jacket of which is made of plastic. The tank is situated along a vertical axis and it has a wet chamber in its lower part, a reserve chamber in its middle part above an inlet orifice and a hatchway in its upper part. The wet chamber narrows conically downwards, and the reserve chamber has form of a cylinder which has stabilizing ridges shaped in planes perpendicular to the axis of the tank, while the surface of sewage in the wet chamber finds itself in the lowermost ridge of the cylinder which is connected with a conical jacket to a lower conical container of the tank, whereas the container has a stabilizing ridge situated in a plane perpendicular to the axis of the tank and a bottom reinforced by a cross shaped head. A nominal diameter of the cylinder of the tank is at least one and a half times bigger than the smallest diameter of the chamber around the bottom of the conical container, at the most two and a half times bigger, whereas the height of the wet chamber is so arranged that the ratio of the nominal diameter of the cylinder of the tank to the said height takes the value of one and three tenths up to one and seven tenths, whereas the ratio of the biggest diameter of the conical container to the diameter of the container around its bottom oscillates between values of one and one tenth and one and three tenths. In the jacket of the tank above the wet chamber there is formed a longitudinal bulge, perpendicular to the planes of the ridges, in which there is an inlet orifice. A tank of such construction is characterized by lasting, stability and resistance against outer pressure of underground water over the bottom and the jacket. Dimensional dependences of particular parts of the tank enable obtaining a volume of the wet chamber corresponding to one operating cycle of a pump mounted on the reinforced bottom of the conical container, thanks to which there is no retention of sewage awaiting for pumping out, and as a result there is eliminated sewage putrefaction by which unpleasant and harmful odours are emitted. Moreover the shape of the conically narrowing wet chamber prevents from sedimentation of sludge on the bottom of the tank. The bulge in the jacket of the tank reinforces the area of the inlet orifice. A substantial diameter of the cylinder of the tank in the reserve chamber enables convenient installing of fittings of a pumping station and carrying out repairs, whereas small diameter of the hatchway does not require a big cover of a pumping station, and the conical jacket connecting a cylindrical hatchway to a cylinder of the reserve chamber additionally stabilizes the tank in the ground.

The object of the utility model is shown in the drawing, in which fig. 1 presents a tank in a perspective view, and fig. 2 - a tank in a section along its axis.

A tank situated along a vertical axis has a jacket 1_ made of plastic according to a known method. In the lower part of the tank there is a wet chamber 2, in the middle part a reserve chamber 3_., and in the top part a hatchway 4, whereas the wet chamber 2 narrows conically downwards, while the reserve chamber 3_ has form of a cylinder 5, in the lower part of which there is an inlet orifice 6. A hatchway 4 has a similar cylindrical form of a smaller diameter. The cylinder 5_. has stabilizing ridges 7 shaped in planes perpendicular to the axis of the tank, whereas the surface of the wet chamber 2 finds itself in the lowermost ridge 7 of the cylinder 5, which is connected with a conical jacket 8_to a lower conical container 9 having a bottom K) reinforced by a cross shaped head H. The container 9 has a stabilizing ridge T_ situated in a plane perpendicular to the axis of the tank. The uppermost ridge 7 of the cylinder 5_. is connected with a conical jacket 12 to the cylindrical hatchway 4. Above the lowermost ridge 7 of the cylinder 5 there is provided in the jacket I a longitudinal bulge 13 perpendicular to the planes of the ridges 7, in which there is an inlet orifice 6. The ratio of a nominal diameter D of the cylinder 5 to the smallest diameter d of the wet chamber 2 around the bottom JJ)

of the conical container 9 fulfils the condition 1,5 < — < 2,5, whereas the ratio of the d biggest diameter d_l of the conical container 9 and the diameter d around its bottom K)

fulfils the condition 1,1 < — < 1,3. The ratio of the height h of the wet chamber 2 d to the nominal diameter D of the cylinder 5_ of the container fulfils the condition 1 ,3 <

— ≤ 1,7. The outlet orifice is made in the jacket 1_ of the tank by fitters of a pumping h station during installation.

Claims

Protective claims

1. A tank for a pumping station, a jacket of which is made of plastic, situated along a vertical axis, whereas in its lower part it has a wet chamber, in its middle part it has a reserve chamber, and in its upper part it has a hatchway, characterized in that a wet chamber (2) narrows conically downwards and a reserve chamber (3) has form of a cylinder (5).

2. A tank as in claim 1, characterized in that the cylinder (5) has stabilizing ridges (T) shaped in planes perpendicular to the axis of the tank, whereas sewage surface in the wet chamber (T) finds itself in the lowermost ridge (T) of the cylinder (5), which is connected with a conical jacket (8) to a lower conical container (9) of the tank, whereas the container (9) has a stabilizing ridge (7!) situated in a plane perpendicular to the axis of the tank and a bottom (10) reinforced by a cross shaped head (11).

3. A tank as in claim 1, characterized in that the ratio of a nominal diameter (D) of the cylinder (5) to the smallest diameter (d) of the wet chamber (2) around the bot¬

tom (10) of the conical container (9) fulfils the condition 1,5 < — < 2,5, whereas d height (h) of the wet chamber (2) is so arranged that the ratio of the nominal di¬

ameter (D) of the cylinder (5) to the height (h) fulfils the condition 1,3 < — < 1,7. h

4. A tank as in claim 2 or 3, characterized in that the ratio of the biggest diameter (d_l) of the conical container (9) and the diameter (d) around its bottom (K)) fulfils the

condition 1,1 < — < 1,3. d

5. A tank as in claim 2, characterized in that above the wet chamber Q) in the jacket (1) of the cylinder (5) there is formed a longitudinal bulge QS), perpendicular to the planes of the ridges (T), in which there is an inlet orifice (6).