Diy pump station ejector

An ejector is a device capable of transferring kinetic energy from one medium to another. An ejector for a pumping station promotes the rise of water from springs more than ten meters deep, is used to protect the engine when the water level drops sharply.

The device can be bought in a store or you can make an ejector for a pumping station with your own hands.

Principle of operation

The ejector works according to a fairly simple principle. The water is recirculated in the lower part of the pipeline, thus making up for the lack of pressure in the suction pipeline. The ejector pushes the water as high as the engine can suck it in.

Water coming out of the tapered T-piece is poured into the mixer at high speed from the suction chamber. In the diffuser, the normal flow of water mixes with the accelerated one and enters the pipeline.

The ejector solves the problem of low pressure

An ejector is installed in the part of the pipeline located between the well and the pump. Part of the water flow, rising upward, returns back to the well, and on the approach to the ejector forms a constant recirculation. An additional vacuum arises in the pipeline, and less pump energy is spent on lifting the liquid.

The operation of the system is adjusted using a valve. Part of the water is supplied to the house, the rest continues to be recirculated in the ejector. The start-up of the pumping station is faster, the energy consumption is reduced, and the installation of equipment of lower power is required.

The package includes: diffuser, mixer, suction chamber, nozzle.

Types of ejectors

Water supply pumping stations for a private house or cottage are manufactured with an ejector built-in or separately mounted into the pipeline.

Stations with a built-in ejector are used to pump water from shallow wells, storage tanks and other water sources. They are distinguished by the ability to capture water below the nozzle.

The built-in ejector is installed inside the pump. This solution makes it possible to significantly reduce the size of the station. In this case, the installation of a filter is not required, the pump with a built-in ejector is not sensitive to sand particles suspended in water. Such stations are mainly used for irrigation systems and with a well depth of up to ten meters; it is not recommended to install them for water supply of residential buildings - they work very noisy.

Pump station with built-in ejector

When installing the ejector as a separate unit, an additional tank is required for water and relieving the load from the engine. The ejector is connected between the well and the engine in the part of the pipeline located in the water. For trouble-free operation of the device, two pipes are laid, as well as a branch pipe with a coarse filter and a check valve. To prevent airing of the system, the pipes are installed strictly in a vertical position.

A station of this type works almost silently and supplies water from wells up to fifty meters deep (the optimal depth is 15 to 20 meters). Pumping stations require the installation of filters to protect against the ingress of sand, silt, and clay impurities in the water.

The efficiency of stations with a remote ejector is small in comparison with the built-in one, but this disadvantage is compensated for by the ability to supply water from considerable depths. The stations can be located several tens of meters from the source.

Self-made ejector

The cost of the ejector is quite high, and besides, they are not always available for sale. It is not difficult to make an ejector for a pumping station with your own hands.

Consider a step-by-step instruction on how to make a conventional ejector on your own, capable of facilitating the rise of water from wells up to 10 m deep, and used to take water from a greater depth.

Making an ejector is not a difficult task!

The following materials and tools will be required:

1. Half-inch tee with female thread - the main part;
2. The fitting is half an inch with a 12 mm or three-quarters 8-10 mm bend, we will insert it inside the tee. Serves as a conductor of high pressure water. To lengthen the fitting, you can use PVC tubing of the same diameter as the fitting;
3. Adapter 20x25 mm with the necessary angles for further attachment to a pipe or three-quarters with an external thread at one end, at the other end - with a thread for a 16 mm diameter metal-plastic pipe;
4. Fitting;
5. Angles 90 degrees for reinforced plastic pipes:

• ¾ with external thread x ½ with internal thread;
• ¾ with an external thread x 26 mm with an internal thread for a metal-plastic pipe;
• ½ with an external thread x 16 mm with an internal thread for a metal-plastic pipe;

1. Grinder, plumbing keys, adjustable wrench, sandpaper;
2. Coupling with a diameter of three quarters (or klupp, lerka) for straightening the thread on the fitting;
3. Vices, but you can do without them.

With a well depth exceeding 10 m, it will be necessary to install an ejector of a more complex design, used in pumps with a power of more than 1 kW.

Diagram of elements of a homemade ejector

To manufacture such an ejector, the following parts are required:

1. threaded squeegee with a diameter of half an inch;
2. ten millimeter nozzle;
3. E40 tee;
4. half-inch and three-quarter locknuts;
5. check valve with coarse filter;
6. plugs with holes and threads for squeegees;
7. squeeze half an inch and three quarters;
8. 90 degree bend half an inch;
9. nozzle or compressed copper tube with slotted holes and welded seams.

First of all, it is necessary to grind off the hexagon of the fitting before giving it the shape of a cone. The outer diameter of the union thread should be 2-3 mm larger than the lower base of the resulting cone. The thread should be four turns in length. Cut off the excess length.

Then you need to align the thread, which will be broken when turning the part. We cut the thread longer so that it goes into the cone and you can further screw it from any edge into the sleeve or tee.

Screw the fitting into the tee until it stops. It should enter 2 mm upwards into the side branch of the tee.

Four or more turns should remain on the internal thread of the tee to attach the branch to them. If there are fewer turns left, grind the threads on the union until the desired parameters are achieved. If the thread is short, you can add to the required size with a PVC tube. The nipple should not protrude more than 3 mm from the tee.

Installing the ejector

If the device is installed in close proximity to the pump, then a pumping station with a built-in ejector is obtained.

In order for the system to work on the principle of a water supply pumping station for a private house with a remote ejector, you need to place it directly in a well or another source of water supply.

In this case, several pipes will be needed for installation:

• a pipe with a coarse filter installed is connected to the tee on the side and lowered to the very bottom;
• a pipe connected from below, through which the emerging high-speed flow of water passes;
• the third pipe, connecting to the tee from above and leading to the water supply system, through which an accelerated flow of water passes under high pressure.

Ejector connection diagram

Screw in an adapter with an external thread from above to the tee. It should be located above the fitting. The second edge will serve as a connection to the pipe supplying water to the plumbing. It will be fastened with a fitting.

From the bottom to the tee (into which the fitting was previously inserted), we screw the corner elbow for further connection with the recirculation pipe. Fastening is done with a crimp nut.

On the side, screw a corner into the tee to connect to the water supply pipe. We fasten the pipe with a collet clamp.

We check the quality of fasteners and waterproofing.

All joints are sealed with tow or sealant.

We certainly install a check valve to the outlet. It will prevent liquid from flowing out of the suction pipe. If the water runs out, the system will not work.

How to extend the life of the ejector?

To extend the service life, pumping stations with an ejector must be operated in compliance with the following rules:

1. when installing the station, it is important to correctly calculate the ratio of the power of the device and the depth of the source from which the water is extracted.
2. constantly monitor the pressure in the pipeline. To measure the pressure in the system, you can use a pressure gauge used for car tires or purchase a station with a special built-in sensor;
3. for sources with great depth, it is necessary to purchase a powerful pump, which must be installed as close as possible to the water intake;
4. the use of a built-in ejector is justified only at high-power stations;
5. at a source depth of 15 to 40 meters, it is necessary to use a remote ejector installed inside the well and located in the water.
6. when using a surface type pump, it is important to correctly position the pipes coming from the surface of the ejector - strictly vertical. If the pipes are not properly positioned, air will enter the system, air plugs will form, which will negatively affect the operation of the system and reduce the duration of its operation.

Subject to all operating rules, ejector pumping stations operate smoothly and provide tap water for the house, watering and other equally important household needs.

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