Device for protection of wastewater pumps for wet accumulation chambers

Abstract

A device for protection of wastewater pumps for wet accumulation chambers has a separation chamber provided with a discharge pipe for discharging wastewater into a sewerage network. A supply pipe connected to the separation chamber supplies solid particles containing wastewater into the separation chamber. A reversing valve arranged between the supply pipe and the separation chamber prevents reverse flow of wastewater into the supply pipe. A bidirectional pipe connected to the separation chamber connects the separation chamber with a pump, where the bidirectional pipe serves to supply wastewater from the separation chamber into the pump positioned in the wet accumulation chamber and for reverse flow of wastewater from the pump into the separation chamber to a discharge pipe. A solid particles separator arranged between the separation chamber and the bidirectional pipe separates solid particles contained in wastewater in the separation chamber.

Claims

1. A device for protection of wastewater pumps for wet accumulation chambers, the device comprising: a separation chamber provided with a discharge pipe for discharge of wastewater into a sewerage network, a supply pipe, connected to the separation chamber, to supply wastewater containing solid particles into the separation chamber, a reversing valve arranged between the supply pipe and the separation chamber in order to prevent reverse flow of wastewater into the supply pipe, a bidirectional pipe, connected to the separation chamber, for connection of the separation chamber to a pump, to convey wastewater from the separation chamber through the pump into a wet accumulation chamber, and for reverse flow of wastewater from the wet accumulation chamber through the pump and the separation chamber into the discharge pipe, a first solid particles separator and a second solid particles separator, each arranged between the separation chamber and the bidirectional pipe, for retaining solid particles contained in wastewater in the separation chamber, wherein the bidirectional pipe and the discharge pipe are arranged such that they open into the separation chamber opposite to each other in a lower part of the separation chamber, wherein the bidirectional pipe is branched, where a first branch opens into the lower part of the separation chamber and a second branch opens into an upper part of the separation chamber, such that the first and second branches are connected to the separation chamber by the first solid particles separator and the second solid particles separators, respectively, and wherein the supply pipe is formed as a perforated inlet trough.

2. The device according to claim 1, wherein the supply pipe is connected to the separation chamber at a top of the separation chamber, above the upper part of the separation chamber.

3. The device according to claim 2, wherein the reversing valve consists of a seat and a float ball positioned in the separation chamber.

4. The device according to claim 1, wherein the discharge pipe extends from the separation chamber slantwise-upwards at an angle of 30° to 70° with respect to a bottom surface of the separation chamber.

5. The device according to claim 1, wherein each of the first solid particles separator and the second solid particles separators contains a frame, provided on its inner circumference with rods of at least two lengths, wherein the rods are on the frame arranged alternatively, long rod, short rod, wherein the long and short rods protrude radially at an angle from a frame plane on one side of the frame such that a surface that longitudinally intersects all rods forms a truncated cone or pyramid, and wherein the rods are arranged such that a space between any two neighboring rods and a space between free ends of any two long rods do not exceed a size for which a throughput rate of an impeller of the pump is dimensioned.

6. The device according to claim 5, wherein the frame is formed as a ring.

7. The device according to claim 4, wherein the angle is 50°.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a configuration of the device according to the present teaching in a wet accumulation chamber of a pumping station.

(2) FIG. 2 shows the device according to the present teaching with a branched bidirectional pipe.

(3) FIG. 3 illustrates a design of a rod solid particles separator.

(4) FIG. 4 shows a configuration of devices according to the present teaching in a wet accumulation chamber that contains two pumps and a supply pipe is in the form of an inlet trough.

DETAILED DESCRIPTION

Example 1

(5) FIG. 1 shows a device for protection of wastewater pumps comprising separation chamber 4 substantially in the form of a perpendicularly positioned cylinder. Said separation chamber is provided in its lower part with discharge pipe 9 of the chamber that is further connected by a dismountable coupling onto discharge pipe 9.1 of a pumping station, that is further connected to sewerage network 11. The device further comprises supply pipe 2, connected to inlet pipe 1. Supply pipe 2 is from another side connected from the top to separation chamber 4 to inlet wastewater into separation chamber 4. A reversing valve for preventing reverse flow of wastewater into supply pipe 2 is positioned between supply pipe 2 and separation chamber 4. Said valve consists of seat 3 arranged on supply pipe 2 and corresponding float ball 5 positioned in separation chamber 4. Bidirectional pipe 7 is connected on chamber 4 in the lower part of separation chamber 4 opposite the orifice of discharge pipe 9 of the chamber. Said bidirectional pipe 7 is connected to pump pipe 7.1 and connects the device with pump 10 positioned in wet accumulation chamber 8. Rod separator 6 of solid particles is arranged between separation chamber 4 and bidirectional pipe 7. The role of the rod separator 6 of solid particles is separating solid particles contained in wastewater in separation chamber 4.

(6) During operation of the device wastewater flows from separation chamber 4, through rod solid particles separator 6 via bidirectional pipe 7 into pump 10 and consequently to wet accumulation chamber 8. Solid particles contained in wastewater are filtrated by solid particles separator 6 and are accumulated at the bottom of separation chamber 4. When water surface in wet accumulation chamber 8 reaches a set switching level pump 10 is switched on. After pump 10 is switched on wastewater from wet accumulation chamber 8 is pumped back by pump 10 through bidirectional pipe 7 and rod solid particles separator 6 into separation chamber 4. An increasing level of pumped wastewater in separation chamber 4 presses float ball 5 onto seat 3, closing the inlet into supply pipe 2. Pumped waster continues further from separation chamber 4 into chamber discharge pipe 9 and further to pump station discharge pipe 9.1. Solid particles accumulated at the bottom of separation chamber 4 are also discharge from separation chamber 4 by pressure of pumped water into chamber discharge pipe 9 and through pump station discharge pipe 9.1 they are further transported into sewerage network 11.

Example 2

(7) FIG. 2 shows a preferred embodiment of the device for pump protection.

(8) The device comprises all parts of the device according to Example 1. The device differs from the device according to Example 1 in that bidirectional pipe 7 is branched. One branch opens into a lower part of separation chamber 4, as in Example 1, and another branch opens into an upper part of separation chamber 4. Both branches are connected to the separation chamber through a separate solid particles separator 6.1, 6.2.

Example 3

(9) FIG. 3 shows a rod solid particles separator consisting of frame 12 of annular shape, where said ring is about its inner circumference provided with rods 13 and 14 of at least two lengths. The rods are on the frame, they are arranged alternately (long, short, long, short). Simultaneously, the rods radially protrude from the frame plane into one side at an angle in a way a plane intersecting their surfaces forms a truncated cone (frustum). The rods are arranged so that a space between any two rods does not exceed the size the throughput rate of the pump impeller is dimensioned for. In practice the distance between the rods is in the range of 15 to 100 mm.

Example 4

(10) FIG. 4 shows connection of the devices according to the present teaching in a wet accumulation chamber containing two pumps. The devices are similar to the device described in Example 2. The devices differ from the device in Example 2 in that they comprise only one common supply pipe 2 in a form of a inlet trough. The inlet trough is connected to inlet pipe 1. From a certain height walls of the inlet trough are provided with filtration perforations. Size of the perforations is dimensioned according to the throughput rate of pump impeller 10 and 10′. Arrangement of perforations in the side walls of the inlet trough are determined by a value of the maximal critical inlet into the pumping station. Accordingly, the perforations are arranged in such height of the trough wall that an average daily flow is securely let in to separation chambers 4 and 4′ through the inlet trough and eventual critical flow is passed directly into wet accumulation chamber 8.