JPH0776873A - Method and equipment for generating circulation in waste-water pump station - Google Patents

Abstract

PURPOSE: To cause automatic circulation in a waste water pump station. CONSTITUTION: A pump unit is provided on the high pressure side with a valve 6, and the valve 6 disconnects connection between a pump and a pump station during a specified time. Thus, circulation occurs in the pump station. The valve 6 is opened and closed by a valve ball 10, and the valve ball 10 is controlled by a pump pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for creating circulation in a pump station which is part of a public sewage system.

[0002]

PRIOR ART Swedish Patent Application No. 7908743
As described in No. -3, sludge build-up occurs when circulation is poor in pump stations and other tanks of sewage systems. Sludge accumulation is
It causes a lot of problems such as bad odor, danger of bursting, and corrosion problem.

[0003]

According to the above-mentioned patent application, these problems are solved by providing a valve at the pump outlet. That is, the valve is temporarily opened, thus causing circulation and flushing within the pump station (cleaning by fluid velocity and shock). Thus, the sludge deposit disappears and the fluid is homogenized.

So far, the adjustment of the valve has been controlled by an electrical device with the help of a linear motor acting on the slide in the valve. The disadvantages associated with this solution are that, in addition to being relatively costly, the pumped medium is usually stone or debris,
Alternatively, the valve is likely to become clogged because it contains a large amount of solids such as other substances. If a stone hits the valve slide, the electric motor would fail.

Another disadvantage is that the valve motor is electrically driven. This means an installation-specific problem that explosive gas is generated in the motor part of the valve.

To solve this problem, another method of controlling the valve with the help of the pressure of the pump is shown in Swedish patent No. 8900597-9.
Here, the negative pressure generated by the flow through the valve is used to move the valve element to the closed position after a certain period of time has elapsed. However, this solution also has disadvantages, since the negative pressure is not always sufficiently strong that the valve element cannot be moved to the closed position.

The present invention aims at providing a device for controlling a valve in a simple and reliable manner, independent of ambient pressure conditions. This is accomplished by utilizing the claimed method and apparatus. The present invention is described below with reference to the accompanying drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawings, reference numeral 1 designates a pump station, which has a submersible pump unit 2 connected to a pressure pipe 3. 4 shows a pump housing with an inlet 5, while 6 shows a mixing valve mounted on the pump housing 4. Reference numeral 7 indicates a valve housing, and 8 indicates an outlet provided with a curved portion 9. 10 shows the valve ball and 11 shows its valve seat. 12 and 13 are diaphragms, 14 and 15 are cups,
Reference numeral 16 denotes a conduit, 17 denotes a control device, and 18 denotes a shoulder portion of the outlet 8.

The device operates in the following manner. Normal,
The valve 6 is closed and the pumped medium is conveyed from the pump housing 4 to the pressure pipe 3. The direction of flow is indicated by arrow A.

The valve is opened for a certain period of time, for example when the pump is started. This means that a certain amount of pumped medium will flow through the valve in the direction of arrow B, and if there is a buildup of sludge there will be a strong stirring force in the pump station to break it up. Means to occur. After a certain amount of time, the valve is closed and pumping proceeds normally.

According to a preferred embodiment, the valve 6 comprises a valve housing 7 with an outlet 8 having a bend 9 at its end. A valve cup 14 is provided in the valve housing 7, and the valve cup 14 holds the diaphragm 12 together with the valve ball 10. When the valve ball 10 is seated on the valve seat 11,
It is configured to be able to block the passage through the valve housing 7.

FIG. 2 shows the valve in the open position, which means that circulation occurs in the pump station. The valve ball 10 occupies a position completely beside the flow and is out of the way of the flow. The flow through the valve creates a pressure differential which is used to control the operation of the valve. The pressure inside the discharge port 8 becomes higher than the pressure inside the valve housing 7 due to the fact that the cross-sectional area inside the discharge port 8 is smaller than the cross-sectional area inside the valve housing 7. The pressure difference also increases due to the shoulder 18 or the bend 9 at the outlet which further increases the pressure.

The above pressure difference is exploited by providing chambers in the valve housing 7 and the outlet 8, which chambers are defined by diaphragms 12 and 13, respectively. Furthermore, these two chambers are connected by a conduit 16.

The diaphragm 13 is pressed inward by the pressure difference between the inside of the valve housing 7 and the inside of the outlet 8 when there is a flow through the valve. This means that the medium, or oil, in the chamber defined by diaphragm 13 will squeeze through conduit 16 into the chamber defined by diaphragm 12. Thus, the diaphragm 12 is pushed outward (upward in the figure), acting to direct the valve ball 10 towards the closed position (see FIG. 3). After the valve ball 10 has moved upward a certain distance, the valve ball 10 is subjected to the action of the flow and is in sealing alignment with the valve seat 11.

The time it takes for the oil to travel from the chamber defined by diaphragm 13 to the chamber defined by diaphragm 12 is controlled in any suitable manner, such as with the help of throttling in conduit 16.

FIG. 4 shows that the valve is in the closed state, which is the case after the scheduled time has elapsed from the state of FIG. Pump pressure exists in the valve housing as long as the pump is running. This means that the diaphragm 12 is pushed downwards back to its original position and the oil is pushed back towards the diaphragm 13,
At this time, the diaphragm 13 is not affected by the pump pressure, and thus returns to the original bent shape. When the pump is stopped, the pump pressure drops and the valve ball 10 moves to its original position due to gravity. Thus the valve is opened and then waits for the pump to start.

In the above description, a freely movable valve ball is used to bring the valve seat into contact with the valve seat for sealing in order to close the valve. Movable rotatable elements are also available as means for closing the valve and are also within the scope of the invention.

In the detailed description and particularly in the drawings, the valve ball is actuated by a diaphragm 12, which diaphragm 12 is located in the outlet 8 and a corresponding diaphragm 13.
Is described. The two chambers defined by these two diaphragms are
Through. It is emphasized that the drawings show only preferred embodiments. The diaphragm design and the chamber design can be modified within the scope of the invention as long as they take advantage of the pressure differential that occurs between the two parts within the valve.

[Brief description of drawings]

FIG. 1 shows a pump station having a pump unit and associated valves.

FIG. 2 is a cross-sectional view when the valve is in an open state.

FIG. 3 is a sectional view immediately before the valve is closed.

FIG. 4 is a cross-sectional view when the valve is in a closed state.

[Explanation of symbols]

 1 Pump Station 2 Pump Unit 3 Pressure Pipe 4 Pump Housing 5 Inlet 6 Valve 7 Valve Housing 8 Outlet 9 Curved Part 10 Valve Ball 11 Valve Seat 12 Diaphragm 13 Diaphragm 14 Cup 15 Cup 16 Conduit 17 Controller 18 Shoulder

Claims (6)

[Claims] 1. One or more pump units, preferably centrifugal pumps of the submersible type, together with a mixing valve, said mixing valve automatically switching the high pressure side of the pump for a certain limited time. A circulation of the pumped medium, which results in the circulation of the pumped medium, in which the return connections to the pump station are alternated by the action of valves, which valves are connected to the high-pressure side of the pump And a discharge nozzle, the control of the valve is carried out by the action of a movable valve element (10), the valve element (10) being in one rest position irrespective of the pressure situation in the valve ( 7) valve seat in (1)
The valve housing (7) is closed by sealing 1) so that the valve element (10) is retained in the diaphragm (12) located outside the flow through the valve in the other rest position. In a method for controlling a valve for causing circulation in a wastewater pumping station, the valve element (10) comprises a first
From its rest position to a second rest position by gravity, and further from the second rest position due to the pressure difference between the outlet (8) and the inside of said valve housing (7) caused by the flow through the valve. A method of controlling a valve for causing circulation in a wastewater pump station, characterized by moving to a first rest position. 2. A pressure differential between the outlet (8) and the interior of the valve housing (7) acts on diaphragms (12) and (13) defining two chambers in communication. The method of claim 1, wherein the method is utilized. 3. A device for carrying out the method according to claim 1, comprising a valve housing (7) having a discharge part (8), the interior of the housing (7) and the discharge part (7). The diaphragm (12) and (1
3) respectively, defining respective chambers (14) and (15) in which said respective diaphragms (12), (13) communicate via a conduit (16), and said diaphragms A control characterized in that (12) moves the valve element (10) in a valve closing direction towards a valve seat (11) in the valve housing (7), interrupting the flow through the valve housing. apparatus. 4. A controller (17) is configured to control the flow through said conduit (16) and said conduit (1).
Device according to claim 3, characterized in that 6) determines the valve closing time. 5. The discharge part (8) has a shoulder part (18) inside.
Device according to claim 3, characterized in that the shoulder (18) bears an increase in pressure inside the outlet (8). 6. The discharge (8) has a bend (9) at its distal end, which bend (9) directs the flow from the valve and increases the pressure in the discharge (8). The device according to claim 3, wherein the device is carried by a ship.