RU2506453C2 - Method and device for pump flushing - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention relates to hydraulic pump flushing. In compliance with proposed method, fluid is forced through pump housing to remove accumulated solids. For this, bleed pump 30 forced water suspension in flushing tank 31 to flush pump housing. Volume of suspension to be forced in equals at least the pump housing volume. Cleaner module comprises vessel and pump connected thereto and having outlet 34 to allows discharge of water suspension there through from said vessel. Bleed pump communicates with inlet 34 and outlet 40. Flushing tank 31 made of material ruling out the sticking of solids thereto has outlet 33 communicated with pump outlet 34 and water suspension discharge pipe 36. Volume of suspension to be forced into the tank 31 equals at least the pump housing volume.

EFFECT: regular flushing intervals, efficient removal of solids.

15 cl, 3 dwg

Description

FIELD OF THE INVENTION

The present invention relates to a method for cleaning a pump housing and, more specifically, a drain pump housing of a home batch water treatment module, corresponding to the restrictive part of claim 1.

According to the proposed method, liquid is passed through the pump housing to remove solid matter accumulating in it.

The invention also relates to a pumping device corresponding to the restrictive part of claim 8 of the formula.

State of the art

Pumps used in batch cleaning units operate in environments composed of liquid and solid. The specified substance easily accumulates, in particular, in the pump casing, which may interfere with the functioning of this module, and the movement of solids from the pump in the direction of flow is usually undesirable. This situation occurs when, for example, water treated in a batch cleaning unit is removed from it. When starting a pump in which a solid has accumulated, it also pumps out the specified sediment. If the volumes of liquid displaced in this way are small, this substance remaining in the internal volume of the pump significantly increases the amount of undesirable impurities.

To avoid these problems, technical solutions using compressed air have been developed for such pumps. They are presented, in particular, in the description of the patent document EP 1566498 and in the description of the German patent for utility model No. 201505661. According to the description of EP 1566498, solid matter accumulated in the pipe is removed from the pipe, pumping it back with compressed air back to the wastewater separation chamber.

In publications JP 2004351400 and JP 20001271782, pumps are described which can be used to continuously separate water from a sludge containing a solid. However, such technical solutions are expensive, and their use in cleaning modules of batch action is difficult.

Disclosure of invention

The problem to which the present invention is directed is to eliminate the problems inherent in known technologies, and to develop a completely new technical solution, which relates, in the first place, to the removal of solids from the drain pump of a batch-type cleaning module during the working periods of this block.

The principle underlying the invention is that the housing of the drain pump is washed, passing through it an aqueous suspension coming from the wash tank, and the specified tank acts as a buffer.

In this case, before washing, the washing tank is filled using a drain pump for pumping the aqueous suspension into the tank, in order to simultaneously remove at least a part of the solid substance inside the pump housing from the pump housing. In the most suitable mode, the volume of the aqueous suspension pumped into the tank is at least equal to the volume of the casing of the drain pump, and in a preferred embodiment exceeds it.

In addition, in the framework of the present invention, a special device is developed that uses a drain pump and is intended for use in a batch cleaning unit. The specified device contains a pump with an outlet pipe and is connected to the working capacity of the module. Thus, it is possible to remove the aqueous suspension formed in the working tank from the portioned-action cleaning module through the pump outlet pipe. According to the invention, the washing tank is displaced in the vertical direction relative to the pump (i.e., located above it) and contains an outlet and an inlet, the inlet being connected to the outlet of the pump. In relation to the discharge, the tank acts as a buffer, and its volume is at least equal to the volume of the drain pump. If this condition is met, it becomes possible to pump into the tank through the pump outlet and the tank inlet a volume of liquid equivalent to the total volume of the pump casing.

More specifically, the method according to the present invention is mainly characterized by the features of the characterizing part of claim 1 of the formula.

In turn, the pumping device according to the present invention is characterized by the features of the distinctive part of claim 8 of the formula.

The use of the invention provides significant advantages. So, the proposed technical solution allows you to flush the pump at the required intervals. The removal of the solid substance remaining inside the pump can be carried out in a rather efficient manner, while it is possible to prevent the migration of the substance into the purified water.

Brief Description of the Drawings

The invention will now be described in more detail through a detailed description with reference to the accompanying drawings.

Figure 1 in a side view illustrates the basic design of the wastewater treatment module, operating on a batch basis.

2A and 2B, respectively, in a perspective view and in a side view, in partial section, illustrate the construction of a pumping device equipped with a washing tank.

The implementation of the invention

As described above, in the technical solution according to the present invention, the housing of the drain pump of the batch cleaning unit is cleaned by regular countercurrent washing. Rinsing ensures that harmful amounts of solids do not accumulate in the pump and that when the pump is turned on, they can be removed together with the liquid.

It is possible to carry out the above procedure once or repeat several times until the pump is virtually clean of solid matter. After that, water can be removed from the batch-type cleaning module through a washing tank, without migrating any solid substance from the pump casing together with the substance to be removed.

It is possible to flush the pump regularly during its operation. In this case, the acceptable intervals between washes are selected in accordance with the utilization rate. In practice, it is enough to flush the pump of the cleaning module with a portioned action 1-5 times in 24 hours or less.

The flushing tank, which is most conveniently placed above the pump, is filled in a pulsed mode until it is almost full, so that the solid substance inside the pump housing also passes into the flushing tank. After this, the liquid / solid mixture is given the opportunity under the action of gravity to return back through the pump, thereby washing its body.

Rinsing is carried out as necessary. Typically, the duration of the injection pulses is about 0.1-20 s, preferably about 0.5-10 s, and even more preferably 1-3 s. The indicated duration depends on the capacity and capacity of the tank. The duration of the washing period between injection pulses is at least 10 seconds, preferably about 15 seconds to 5 minutes, and even more suitable, at least 1 minute. It is important that the flushing period is sufficient to ensure that solids are removed from the pump.

The lower part of the flushing tank has the shape of a cone, or its surface narrows in some other way. The specified part is connected to the outlet of the pump. In a more preferred embodiment, the neck of the conical lower part is connected to the outlet of the drain pump. Then the aqueous suspension pumped into the wash tank, under the action of gravity, easily flows back into the pump and can wash its body.

The dimensions of the washing tank are selected, for example, so that its volume is 1-3 times larger than the volume of the pump. With this volume ratio, the solid can be effectively washed out of the internal cavity of the pump. On the other hand, the advantage of the system is the fact that the volume of the tank is not so large that its filling and countercurrent washing can agitate the sludge in the working tank. In accordance with these recommendations, the rinse tank volume refers to the pump volume approximately 1-10: 1, particularly preferably 1-5: 1.

During operation of the batch-type cleaning module, purified water is regularly removed from the working tank through the outlet pipe. The ability to implement the flushing function described above is ensured by the fact that the outlet pipe in the flushing tank is preferably located on the upper edge of the tank below the level to which the aqueous suspension rises during the pump pulses, pumped to flush the pump.

The conical lower part can be made of the same material from which the remaining parts of the wash tank are made. It is preferable to choose a material to the surface of which the solid does not adhere. Suitable materials include various thermoplastics, as well as structural materials with a thermoplastic coating. To improve the adhesion resistance, their surface can be subjected to a separate additional treatment. Suitable plastics are, for example, polyethylene, polypropylene and other polyolefins.

A preferred embodiment of the present invention is presented in the accompanying drawings. Figure 1, which shows the basic design of a cleaning module of batch action, the following numerical designations are used:

1. cumulative capacity

1a. power unit compartment

2. working capacity

3. connection between containers

4. inlet pipe

5. transfer pump

6. transfer pump pipe

7. control center

8. level controller for the transfer pump

9. aerator plate

10. aerator pipe

11. compressor

12. measuring device

13. control unit for the chemical pump

14. chemical supply pump

15. flex

16. outlet pump

17. outlet pipe

18. sludge pump

19. sludge pumping pipe

20. hopper for excess sludge

21. base of the power unit compartment

22. flushing tank

The cleaning module shown in the drawing is intended for the treatment of domestic wastewater. It contains two main parts, namely the storage tank 1, into which the waste water to be treated is fed through the inlet pipe 4, and the working tank 2, in which real cleaning is carried out using activated sludge. In fact, tanks 1 and 2 are separate units communicating with each other via connection 3. Wastewater is pumped from the storage tank 1 into the working tank 2 by means of a transfer pump 5 controlled by a level 8 controller. The specified controller includes a transfer pump when the level of wastewater supplied to the storage tank exceeds a predetermined limit value. As a result, the wastewater is pumped through the connection 3 through the conveying pipe 6 into the working tank 2.

The control center 7, by means of which the operation of the entire device is regulated, is placed in the compartment 1a of the power unit integrated in the storage tank. The base 21 of the specified compartment divides the storage tank into two parts. Due to the placement of the control center 7 and the power unit compartment 1a inside the storage tank 1, this center is reliably separated and isolated from the surrounding space. In the compartment 1a there is also a compressor 11, which produces compressed air with the ability to pump it into the wastewater to be treated in a working tank. The injection is carried out using a pipe 10 and aerator plates 9 located at its end below the surface of the liquid. In addition, in the compartment 1a there is a chemical supply pump 14, as well as a flexible supply pipe 15 for these preparations and a control unit 13 for this pump. The specified pump 14 is used to pump chemicals into the storage tank 1.

Obviously, the power unit compartment can be placed not inside the storage tank, but in some other place, i.e. the described option is only one of the possible technical solutions.

In addition to the pipe and aerator plates, the working tank contains a pump 18 for pumping sludge. By means of this pump, sludge accumulating in the lower part of the tank can be removed. To collect sludge, a container (for example, hopper 20) is placed in the storage tank for excess sludge connected to the pump 18 through a pipe 19 of the appropriate purpose.

Wastewater entering the working tank is subjected to aeration, directing air through the aerator plates into the water directly or using sparging. At the same time, sludge (in particular, activated sludge) containing microorganisms begins to form in the tank. Under the influence of these microorganisms / microbes, the nutrients in the wastewater decompose, followed by the formation of gas and decomposition products that dissolve in the liquid. These products settle in the sludge, thereby forming a layer of activated sludge, while purified water remains on top of such a layer. This water is regularly removed from the tank using the outlet pump 16. The operation of this pump is controlled using a measuring device 12. The pump is connected to a flushing tank 22 connected to the outlet pipe 17 of the tank.

On figa and 2 In the pumping device according to the present invention, shown in figure 1, is presented in more detail. Numbers 30 and 31 refer respectively to the drain pump and to the flushing tank placed above it. The lower part 32 of the tank is cone-shaped, and the inlet pipe with an inlet 33 provided with a flange is connected to the outlet 34 of the pump 30. The pump control unit and its inlet communicating with the working capacity are indicated as 35 and 40, respectively. As shown in the drawings, the outlet pipe 36 of the washing tank is located on the upper edge of its upper cylindrical part 37 directly below the upper wall 38. An air bleed valve 39 is placed in the upper cover of the tank, allowing air to be displaced, displacing water pumped out of the tank (as shown by the arrows). Accordingly, by means of said valve, so-called compensation air can be introduced into the tank when the tank is emptied through its conical lower part.

As can be seen from the previous text, according to a preferred embodiment of the invention, the flushing tank 31 is in direct hydraulic contact with the pump 30: there is no valve between the inlet 33 of said tank and the outlet 34 of the drain pump. With this technical solution, when the pump is turned off, the flushing tank is emptied automatically under the influence of gravity. During this process, fluid flow from the tank flushes the pump casing.

Claims (14)

1. A method of washing a pumping device connected to the working capacity of a batch-type cleaning module, comprising passing an aqueous suspension through said device, characterized in that
- as a pumping device using a drain pump,
- the aqueous suspension is pumped into the washing tank (31), which is in hydraulic contact with the drain pump (30),
- use an aqueous suspension pumped into the wash tank to flush the drain pump housing to remove solid matter accumulated in its housing,
wherein the volume of the aqueous suspension pumped into the wash tank is at least equal to the volume of the casing of the drain pump. 2. The method according to claim 1, characterized in that the aqueous suspension is pumped from the drain pump (30) into the wash tank (31), which is placed above the pump, with the possibility of returning the aqueous suspension from the tank to the drain pump housing by gravity. 3. The method according to claim 1 or 2, characterized in that the washing tank (31) functions as a buffer, which prevents the release of solids from the cleaning module batch action. 4. The method according to claim 1 or 2, characterized in that the aqueous suspension is pumped by a drain pump (30) into the washing tank (31) in a pulsed mode. 5. The method according to claim 4, characterized in that the duration of a single injection pulse is approximately 0.1-20 s. 6. The method according to claim 1 or 2, characterized in that the duration of the washing period is at least 10 s. 7. The method according to claim 1 or 2, characterized in that after the washing period, the liquid is removed from the cleaning module of batch action through the outlet pipe (36) of the washing tank. 8. A batch-type cleaning module containing a working tank and a bleeding device that is connected to a working tank and has an outlet (34) configured to remove an aqueous suspension through the working tank, characterized in that the pumping device contains a drain pump (30 ) connected to the outlet (34) and the inlet (40), and a washing tank (31) placed above the pump, made of a material to which the solid substance does not adhere substantially and having an inlet s (33) connected to the outlet (34) of the pump; and an outlet pipe (36) for the aqueous suspension; at the same time, to ensure the possibility of pumping the full volume of the pump into the tank during one cycle, the volume of the tank (31) is at least equal to the volume of the pump casing. 9. A cleaning module according to claim 8, characterized in that the volume of the flushing tank (31) is approximately 1-10 times greater than the volume of the pump. 10. A cleaning module according to claim 8 or 9, characterized in that the lower part of the washing tank (31) has a conical shape and is connected to the pump outlet (34). 11. A cleaning module according to claim 8 or 9, characterized in that the washing tank (31) is made of plastic, preferably a polyolefin, such as polyethylene or polypropylene, or a structural material that is coated with plastic. 12. A cleaning module according to claim 8 or 9, characterized in that an air bleed valve (39) is installed on the flushing tank (31). 13. A cleaning module according to claim 8 or 9, characterized in that the outlet pipe (36) of the washing tank is placed on its upper edge. 14. A cleaning module according to claim 8 or 9, characterized in that the washing tank is in direct hydraulic contact with the pump, with the possibility of automatically removing from the tank the liquid that is supplied to the pump by gravity when the pump is stopped.

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