How to make an ejector for a pumping station with your own hands: a detailed guide. DIY ejector drawings

Almost everyone who has ever been directly involved in organizing the arrangement of an autonomous-independent water supply has periodically encountered problems regarding the insufficient level of water supplied by the suction pump.

In the subject of physics, we definitely know and understand that such a factor as pressure is capable of supplying liquid from a maximum depth of nine meters, but in fact this figure is much less, which in reality is about seven and sometimes five meters of full supply.

A station that can increase the pressure of the water flow will solve the problem. Specialized equipment designed for such purposes is produced by modern industry, which is part of pumping stations.

Ejector for pumping station

From the article presented to your attention, you will learn in detail about the operating principles of such specialized equipment as a station with an ejector, as well as all the nuances and aspects regarding their use. Additionally, methods will be considered possible production such equipment independently with appropriate instructions and recommendations, thanks to which you can achieve this goal.

Water supply station with ejector

Device. Operating principle

An ejector is essentially a device that transfers energy from one more mobile medium to another, which is less mobile. In the tapering sections of the unit, a special zone of lower pressure is formed, which thus provokes the suction of additional medium. Thus, it is possible to move and move away from suction points, due to the interaction of the original environment.

Units equipped with an internal format ejector are intended directly for specialized pumping of liquids from relatively shallow wells, the depth of which does not exceed eight meters, as well as various specialized storage tanks or reservoirs.

Directly distinctive feature Such interaction is precisely to capture liquid that is located at a lower level from the pipe. Based on this, preliminary filling of the unit with water will be required. The working wheel will pump liquid, which will redirect it to the ejector, resulting in the formation of an ejection jet.

It will move through a specialized tube and accelerate. Naturally, the pressure will decrease. Thanks to this effect, it will also decrease inside the suction chamber.

One of the varieties of such surface installation units is a pumping station with an ejector. They differ in that the external element is immersed in the water supply source.

As a rule, the scope of application of such devices is similar to their analogues. The definite difference lies in the different depths of use and application.

Pumping station with remote ejector

Manufacturing

It is quite possible to produce a fairly simple device-unit independently. This will require some parts, such as a tee of a specialized diameter and a fitting that will be located inside it. The correct length ratio must be observed, which should not be more or less, which will not allow such a device to function normally. For fastening you will need a special adapter equipped with corners, which will allow you to create the desired rotation.

The creation process involves several specific points, which includes the process of preparing the required fitting itself. Part of a special 6-sided sample should be ground, which will allow it to be made into a special cone, having a base smaller than the external thread in diameter. After which the deformed part should be corrected with a specialized thread-cutting tool. The fitting must be screwed all the way into the tee piece. When connecting, be very careful to observe the length ratio, which is sufficient important factor

. Be sure to seal the connection with any available sealant.

Check the ratio of the parts being manufactured, and then from pre-prepared samples you should organize a specialized adapter, which is designed for installation on the pipe.

A well-assembled station will ensure fairly long and trouble-free operation due to its simple design, but, naturally, you must be extremely precise in manufacturing. If you don’t really want to engage in such production, then you can simply purchase it in specialized stores, where a pumping station is always available for free sale.

The station is used to increase the pressure, which will also eliminate the possibility of premature failure of the unit that provides the supply, since idling may occur. The presence of such an element in the system will exclude it, which is why it is recommended for mandatory integration into the system, regardless of the possible depth of the source.

Timely equipping a station with an ejector will save you from additional costs and possible stress in case of possible failure of more expensive system equipment, which it will simply prevent, ensuring full and uninterrupted functionality for a long time.

A deep aquifer is a common problem that is well known to many land owners. Conventional surface pumping equipment either cannot provide the house with water at all, or supplies it to the system too slowly and with low pressure.

This problem needs to be resolved as soon as possible. Agree, buying a new pump is an expensive undertaking and not always financially justified. A solution to this situation could be an ejector for pumping station water supply

We will tell you how to choose a suitable unit and install it without the help of specialists. We will also provide step-by-step instructions on how to make and connect a homemade ejector. All stages of work are accompanied by visual photographs.

The deeper the water is, the more difficult it is to bring it to the surface. In practice, if the well depth is more than seven meters, it has difficulty coping with its tasks.

Of course, for very deep wells it is more appropriate to purchase a high-performance submersible pump. But with the help of an ejector, it is possible to improve the performance of a surface pump to an acceptable level and at significantly lower cost.

The ejector is a small but very effective device. This node has relatively simple design, you can even make it yourself from scrap materials. The operating principle is based on giving the water flow additional acceleration, which will increase the amount of water coming from the source per unit of time.

Image gallery

The same article shows a sketch of this ejector. But how exactly to do it turned out to be unclear to many.

Let me make a reservation right away that in the process of writing this article I did not make this ejector. IN this moment I don’t need it, but I can do it at any time, spending an hour and a half on it.

And yet I will start a little from afar so that there are as few questions as possible.

Names and symbols.

Having visited my wife’s parents in the Ulyanovsk region, I was surprised to find that salespeople in plumbing stores do not always understand what I am asking them for, although I did not experience such problems in St. Petersburg. Therefore, I would really like you and I to speak the same language and understand each other, especially in terms of names and designations related to plumbing.

In plumbing, it is customary to designate parts and threads on them symbols, understandable, however, to anyone who speaks and writes in Russian. The size or diameter of the thread is most often indicated in inches: ½, ¾, 1½. This also indicates that the threads on the parts are not metric, but conical - pipe. The letters next to the thread designation indicate what kind of thread it is: internal ( IN) or external ( N).

For example, a short notation: angle ¾ N x ½ V - means a reducer (or corner adapter) having one end with a ¾ inch or 20 mm diameter male pipe thread and the other with a ½ inch or 15 mm diameter internal pipe thread. Let me clarify again, the letter “ IN " in this designation does not mean external thread ( external no thread, yes external ), but only and only internal .

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Reviews (50) on “Homemade ejector for a pumping station.”

Hello, please tell me I have a 16m well on my street. There is a 5m column of water in it. A well with pipe 110, if I drive pipe 32 to the same level, will the water column in it be larger?

Hello, Valentin.
Well, it will be... a couple of centimeters... due to surface tension forces. What's the point in this? If you can lower a pump into the 110th pipe, at least a “Malysh”, if funds are tight. You can’t even fit a check valve into the 32nd pipe. The larger the diameter of the “well”, the easier it is to get water from it. I think so.

I'm sorry, of course, but from the pump to raise the water, make another one Vacuum pump to raise the same water…. this is complete nonsense, what is 2-3 meters of water? This is 0.002 bar of pressure. Such a station should provide 2 Bar of pressure in the water supply.

I forgive you, Sergey :) Although you wrote complete nonsense. Combining several types of pumps in one housing, not to mention combining several pumps of the same type in one housing (multi-disc, poly-impeller) is not nonsense, but a reality and commonplace of our days.
And 2-3 meters of water column is not 0.002 Bar, but 0.2-0.3 Bar, i.e. 100 times more than you think. So repeat the physics course from the school curriculum and don’t show anyone your lack of education. No need…

Please tell me. My well depth is 32 m, the water surface is about 5 m from the station. Polish station JET-100A(a) with a 24 liter tank. When starting, it maintains good water pressure for about 30 seconds. Then the pressure drops sharply, and as a result, the tank fills the cubic capacity in about 6 hours. Experts say that the well yield is low. If so, is it possible to raise it? The neighbors at a distance of 50 m from my well maintain good pressure.

Hello Andrei.
Yes, the low flow rate of the well may be to blame. However, this can be easily checked by measuring the water level (distance to the water surface) before turning on the pump and immediately after. Key moment here is how quickly after a pressure drop you can measure this level, because, usually, in a well, even with a low flow rate, the level is restored quite quickly.
Unfortunately, as a rule, the flow rate of a well is its characteristic, which is almost unchanged throughout its operation, and can only fall over time if the “operation rules” and some other natural circumstances are not followed. The flow rate increases slightly only in the off-season, when the amount groundwater increases. But this leads to their worse filtration in soils.
However, the flow rate of a well also depends on the depth from which water is drawn. This determines the so-called dynamic water level in the well, which depends on the flow rate of the well (naturally), the amount of water extracted by the pump and the depth from which this water is extracted. The last moment is determined by the pressure difference between the water column in the well and the pressure in the aquifer from which water enters the well. Thus, it turns out that the lower the level drops (the water column decreases), the greater the well’s flow rate will be. Because the water pressure in the aquifer can be considered constant.
So the only solution to the problem in your case would be to install a submersible pump instead of a surface pump, which has a limitation on the depth of water it can extract. You can add an external ejector to the surface pump to increase the depth, if its power allows this and it is enough to lift water from a greater depth.
In both cases, it is desirable to find this very balance between the amount of incoming and extracted water, that is, to find that same dynamic level experimentally. If this does not work when the pump is at full load, you can try to reduce the water flow through the pump by, for example, closing the tap at its pressure.

Is it possible to create a vacuum in the tank with one(!) ejector pump (so that the water boils at 45 degrees) and mix the water in the same tank?
Thank you.

Hello, Alexander. Hm, interest Ask 🙂 .
Purely theoretically this is possible. However, in practice, this is almost impossible to do for two reasons:
1. For water to start boiling at 45 degrees Celsius, you need to create a vacuum (vacuum) of minus 0.9 atm, i.e. so that the actual pressure in this tank is 0.1 atm. This is at the limit of the capabilities of ejector pumps, which, let me remind you, can lift water from a depth of 9.0 meters, which corresponds to just such a vacuum. But as the water temperature rises, its density decreases. As a result, the pump, yes, will be able to create such a vacuum, but with a water temperature of no more than 7 degrees Celsius. As the water temperature increases, the vacuum created by the pump will decrease.
In addition, at the slightest flow of water through the pump in order to organize its mixing in the tank, the vacuum will also decrease both due to a decrease in the pressure drop in the pump itself and due to the volume of water entering the tank. However, this point can be taken into account in advance and adjustments can be made.
2. The second reason is again related to the temperature and density of water in a vacuum. Even if you somehow manage to create an installation in which the pump creates the vacuum necessary for boiling and ensures mixing of the water, for example, at a lower vacuum and a higher temperature, then as soon as the water boils, the pump will immediately stop working normally. Because when water boils, its density drops sharply. And a pump designed for one density of the working medium simply cannot pump a medium (water) with a lower density.
In industry, this problem is solved by separating the tank and the pump in height, and the difference in height is considerable, about 10 meters, in order to ensure, due to the height of the water column, a density of “boiling” water acceptable for pump operation. True, the vacuum in the tank is created there in other ways.

Why do you need a “Vacuum Deaeration Installation”? Or is the question purely “academic”? 🙂

I'm a turner. For a number of reasons, I want to make an ejector vacuum pump that provides a vacuum of 0.1 atmospheres in order to see how water boils at 46 degrees.
I have car coolant pumps driven by a drill and an air turbocharger from a truck.
The search engine offers many drawings when asked: “Ejector pump drawings.” Help me choose the most correct ones.
Productivity is the lowest. The main thing is the vacuum.
Thank you in advance.

Hello, Alexander.
In general, a rather strange desire 😉 . In addition, there are more simple ways see how water boils at 45 degrees (by the way, nothing unusual, it boils and boils, just a little less steam). And the ejector pump is not the best for such a task. the best choice due to the difficulty of maintaining clearances during its manufacture, namely, the ability of the pump to create its maximum vacuum depends on them.
For such purposes, it is better to use a compressor or piston pump. The first one will easily pump out excess air from the “inspection” container, and nothing will happen to it, its job is to pump out air. The second one easily creates maximum vacuum with minimum productivity, which is what you need. At the same time, everyone who is familiar with internal combustion engines first-hand, namely increasing their compression, has “eaten the dog” in ensuring its density. By the way, you can make such a pump from an internal combustion engine.
And a little stupid question, how are you going to see it? After all, then you need a tank with a sealed viewing window that will withstand this pressure difference.
A car pump won't fit, the gaps aren't right. And its task is different: maximum productivity with sufficient pressure, and most importantly, it works with suction pressure, and not vacuum.
Air compressor- May be. It all depends on the pressure drop across it during operation (there are turbochargers that create only 3.0 atm, they don’t need more), and again, clearances. I don’t want to remember the other nuances of ensuring its operation (for example, lubrication), there are a lot of “interesting” things there...
Well, returning to the ejector pump, i.e. Let me clarify, for a pump with a built-in ejector... The ejector itself is not a part with axial symmetry, and making it yourself, for example, from metal, is quite problematic. Most often, in production, it is made of plastic, i.e. stamped and cast from several parts. That's why he doesn't tolerate it well high temperature water inside the pump. But the vacuum itself in the pump is created not by it, but by the impeller, which also has a rather complex design. The ejector only “helps” to level out possible cavitation due to some loss of pump efficiency. The greater the vacuum at the pump suction, the better (higher quality) the required gaps between the impeller, pump housing and built-in ejector are maintained. So, I don't know...

Hello. A very informative article from a practical person who understands physics well. Thank you. You would help me a lot by dispelling doubts in my particular case. Will the length of the “ejector suction” pipe such that there are 5-6 meters from the ejector to the “mirror” affect the operation of the system?

Hello Dmitry.
Of course it will. An external ejector is still not a pump, but a passive device for increasing pressure in the suction line of the pump by reducing its (pump) performance. Accordingly, between the ejector and the pump, i.e. within the range of the device, its effectiveness is maximum. And the further the raised water is from the ejector, the worse it works.
Purely theoretically, with the help of an ejector it is possible to raise water if there is 5-6 meters between it and the water, if a vacuum is created at the ejector suction at least a little more than this 0.5-0.6 atm. But you need to take into account that minus 0.5-0.6 atm is almost all that the pump can produce (minus 0.8-0.9 atm). But he still needs to raise the water from the ejector to himself, for which a measly 0.3 atm remains. And even if the pump can do this, its performance will be practically zero. All pump energy will be spent on circulating water through the ejector to maintain the above vacuum values plus overcoming the hydraulic resistance of the system.
So, practically, such a system configuration will be of no use. Most likely, the pump will not be able to lift water under such conditions. That is why the external ejector, for its greatest efficiency, should be located in the water or very close to it. If this is impossible for some reason, then the problem will have to be solved in some other way.
However, I still don’t understand what the problem is. If there was more information, perhaps I could help...

Thank you very much for your detailed answer. I'm going to drill a well. About 10 meters to the water. Therefore, I had a small question, why not save on labor intensity and casing pipes. That is, to break through the “Abyssinian” with an expansion in the upper part of the well to introduce the ejector unit to a small but sufficient height. I don't need a lot of water. The attached picture shows my train of thought.

Greetings, Dmitry.
Your train of thought is correct. And at this depth of water everything should work. True, there is a classic way to solve this problem. This is a caisson over a well. Two meters of depth will be enough for a surface pump installed in it to easily extract water from a small diameter well. It is desirable, of course, that the check valve should still be located on the suction pipe of the pump, and not on the well casing. In this case, a positive result is guaranteed. This option is also good because it immediately provides a non-freezing place for the pump.
By the way, when implementing your option, the conditions with the check valve are the same. Which imposes some restrictions on the internal diameter of the well.

Hello, I have the same problem: I connect the pump to a well with a hand pump, pump water into the system manually, pour water into the pump, turn off the tap from the hand pump, there is water in the system, turn it on centrifugal pump I open the tap on it, but the water goes back and even sucks it out of the pump, the reason is in the pump or in the connection diagram, the water surface is 6.5 m, the suction depth of the pump according to the characteristic is 9 m.

The operating principle of the ejector is quite simple

Very often in suburban areas there is no centralized water supply. Therefore, owners of private houses have to drill wells and organize a water supply system themselves. However, pressure waters are often located at great depths. In this case, water extraction is complicated by the fact that a conventional pump for transporting water becomes insufficient. Therefore, very often an ejector is installed in such systems.

The deeper the well, the more difficult it is to draw water from it. Therefore, a pump is used to move fluid through the pipeline. However, with a well depth of more than 7 meters, a conventional such device will not be enough. In this case, you can purchase a more powerful submersible device or supplement the system with an ejector, which will completely solve this problem.

The principle of operation of the ejector can be understood by studying the illustration presented.

An ejector pump is a device that moves the energy of one medium to another. Its operating principle is based on increasing the water pressure in the pipeline due to the rapid movement of liquid along a special branch.

This operating principle allows you to increase the capacity of an existing surface pumping station. Thanks to this, it is possible to extract water from a well up to 40 meters deep. To better understand how this device works, it is necessary to monitor its operation.

Operating principle of the ejector pump:

Water flows through the nozzle into the ejector. In this case, the cross-sectional diameter of the nozzle is less than the diameter of the entrance to the ejector system.
By passing through a narrow nozzle into a chamber with a larger diameter, the liquid is significantly accelerated. Thus, its pressure increases. An area of lower pressure is formed in the mixer chamber.
Thanks to the rarefied atmosphere, liquid, which is under higher pressure, begins to be sucked into the chamber at tremendous speed.

This device is very useful for deep wells. After all, it allows you to quickly pump out water from the deepest holes.

Types of ejector pumps

An ejection pump is a useful thing on the farm, especially if there are deep wells on the site. To make it convenient to use them, you need to choose the option that suits you. pumping equipment.

Ejectors have a fairly simple design. That is why they are easy to make with your own hands.

There are several types of ejector pumps, they are divided according to their operating principle and design:

A steam ejector pump pumps out gaseous media from confined spaces. Thanks to this, a rarefied environment is maintained. Such ejectors are used quite often.
A jet steam ejector sucks gases or water out of a confined space using the energy of steam jets. In this case, jets of steam exit the nozzle and force water to move, which exits the annular channel through the nozzle.
A gas (or air) ejector compresses gases that are already in a rarefied environment using highly directed gases. This process occurs in a mixer, from which water flows into a diffuser, where it is slowed down and the voltage increases.

Ejector pumps have excellent performance properties

Ejectors also differ in their installation location:

The built-in water ejector is installed inside or next to the pump. Thanks to this arrangement, the device takes up minimal space and is not afraid of dirt. In addition, such devices do not require the installation of additional filters. They are used for wells whose depth is no more than 10 meters. In addition, built-in ejectors make a lot of noise during operation and require a powerful pump.
The device, which is called remote (or external), can be installed at a certain distance from the pump, but not more than 5 meters. They are often placed in the well itself.

All types of ejectors are suitable for use in a private home. They help to quickly pump water out of a well, despite its depth.

DIY making

It is quite possible to make ejectors with your own hands. Of course, such work requires a certain responsibility and care, but it is still quite doable.

The vacuum pump is especially popular. The drawings and diagram of such a device are extremely clear.

The ejector, of course, can be easily purchased ready-made. However, if you want to save a lot, it is better to do it yourself.

Making an ejector with your own hands:

It is necessary to take the tee and attach the fitting to it so that the fitting pipe fits inside the tee and does not protrude from it. If the pipe is too long or short, this can be corrected. In the first case, it can be ground off, and in the second, a polymer tube can be extended.
Now you need to work with the part that will be connected to the pump. To do this, an adapter is screwed at the top of the tee.
At the bottom of the tee, in the part where the fitting is located, a bend in the shape of an angle is screwed on. It will connect to the recirculation part of the ejector.
An angle-type adapter is also screwed into the side of the tee. It is attached to the pipe using a collet clamp.

All connections must be sealed with special tape.

Installation rules and first launch

After you assemble the ejector, it must be installed correctly. If you follow the instructions, it will be easy to do. After all, the product itself has a very simple design. There are three outputs on the ejector. Each of these outputs must have its own pipe connected.

First of all, the pipe is attached to the outlet that will draw water from the well. It is located on the side of the device. A filter and check valve are mounted at the end of such a pipe. The pipe used for sampling should be long, but it does not need to reach the very bottom of the well.

Before installing the pump, you should watch the training video

A pipe with a narrowed fitting is connected to the bottom of the ejector. This is the main line for water circulation. The second end of the pipe is connected to the container. Water will be drawn from it to create a reverse flow. A third pipe is connected to the top of the ejector. The other end is mounted on the pump.

How to start the station for the first time:

Pour water into the ejector hole and turn off the valve that allows water to move from the pump through the water supply.
Next, you need to turn off the pump for half a minute and then turn it on. Open the tap and release some of the air from the system.
Repeat these steps until the water line fills the pipes with water.
Turn on the pump, wait until the system is filled with water, and the pump will automatically turn off. Open the tap and wait until the pipes are empty and the pump turns on again.

If water does not flow, the system is not assembled correctly. In this case, you will have to find the problem and fix it. That is why the first launch must be carried out in the described way.

An ejector is needed for those who live in a private house and have a very deep well. Such a system will allow you to use a not very powerful pump as efficiently as possible.

Ejector - what is it? This question often arises among owners country houses and dachas in the process of arrangement autonomous system water supply The source of water entering such a system, as a rule, is a pre-drilled well or well, the liquid from which must not only be raised to the surface, but also transported through a pipeline. To solve such problems, a whole technical complex, consisting of a pump, a set of sensors, filters and a water ejector, installed if liquid from the source needs to be pumped out from a depth of more than ten meters.

In what cases is an ejector needed?

Before dealing with the question of what an ejector is, you should find out why a pumping station equipped with it is needed. Essentially, an ejector (or ejector pump) is a device in which the energy of motion of one medium moving at high speed is transferred to another medium. Thus, the operating principle of an ejector pumping station is based on Bernoulli’s law: if a reduced pressure of one medium is created in a narrowing section of the pipeline, this will cause suction into the formed flow of another medium and its transfer from the suction point.

Everyone knows well: the greater the depth of the source, the harder it is to raise water from it to the surface. As a rule, if the depth of the source is more than seven meters, then a conventional surface pump has difficulty performing its functions. Of course, to solve this problem, you can use a more productive submersible pump, but it is better to go the other way and purchase an ejector for a surface-type pumping station, significantly improving the characteristics of the equipment used.

By using a pumping station with an ejector, the liquid pressure in the main pipeline increases, while the energy of the fast flow of the liquid medium flowing through its separate branch is used. Ejectors, as a rule, work in conjunction with jet-type pumps - water-jet, liquid-mercury, steam-mercury and steam-oil.

An ejector for a pumping station is especially relevant if it is necessary to increase the power of an already installed or planned installation of a station with a surface pump. In such cases, the ejector installation allows you to increase the depth of water intake from the reservoir to 20–40 meters.

Overview and operation of a pumping station with an external ejector

Types of ejector devices

According to their design and operating principle, ejector pumps can belong to one of the following categories.

Steam

With the help of such ejector devices, gaseous media are pumped out of confined spaces and a rarefied state of air is maintained. Devices operating on this principle have a wide range of applications.

Steam jet

In such devices, the energy of a steam jet is used to suck gaseous or liquid media from a confined space. The operating principle of this type of ejector is that steam escaping from the nozzle of the installation at high speed carries with it the transported medium exiting through an annular channel located around the nozzle. Ejector pumping stations of this type are used primarily for rapid pumping of water from the premises of ships for various purposes.

Gas

Stations with an ejector of this type, the operating principle of which is based on the fact that the compression of a gas medium, initially under low pressure, occurs due to high-pressure gases, are used in the gas industry. The described process takes place in the mixing chamber, from where the flow of the pumped medium is directed to the diffuser, where it is slowed down, and hence the pressure increases.

Design features and principle of operation

The design elements of the remote ejector for the pump are:

a chamber into which the pumped medium is sucked;
mixing unit;
diffuser;
nozzle, cross section which narrows.

How does any ejector work? As mentioned above, such a device operates according to the Bernoulli principle: if the speed of the flow of a liquid or gaseous medium increases, then an area characterized by low pressure is formed around it, which contributes to the rarefaction effect.

So, the operating principle of a pumping station equipped with an ejector device is as follows:

The liquid medium pumped by the ejector unit enters the latter through a nozzle, the cross-section of which is smaller than the diameter of the inlet line.
Passing into the mixer chamber through a nozzle with a decreasing diameter, the flow of the liquid medium acquires a noticeable acceleration, which contributes to the formation of an area with reduced pressure in such a chamber.
Due to the occurrence of a vacuum effect in the ejector mixer, a liquid medium under higher pressure is sucked into the chamber.

If you decide to equip a pumping station with a device such as an ejector, keep in mind that the pumped liquid medium does not enter it from a well or well, but from the pump. The ejector itself is positioned in such a way that part of the liquid that was pumped out of the well or well by means of a pump is returned to the mixer chamber through a tapering nozzle. The kinetic energy of the liquid flow entering the ejector mixer chamber through its nozzle is transferred to the mass of the liquid medium sucked by the pump from the well or well, thereby ensuring constant acceleration of its movement along the inlet line. Part of the liquid flow, which is pumped out by a pumping station with an ejector, enters the recirculation pipe, and the rest goes into the water supply system served by such a station.

Once you understand how a pumping station equipped with an ejector works, you will understand that it requires less energy to raise water to the surface and transport it through a pipeline. Thus, not only does the efficiency of using pumping equipment increase, but also the depth from which the liquid medium can be pumped out increases. In addition, when using an ejector that sucks up liquid on its own, the pump is protected from running dry.

The design of a pumping station with an ejector includes a tap installed on the recirculation pipe. Using such a valve, which regulates the flow of liquid flowing to the ejector nozzle, you can control the operation of this device.

Types of ejectors at installation site

When purchasing an ejector to equip a pumping station, keep in mind that such a device can be built-in or external. The design and principle of operation of these two types of ejectors are practically no different; the differences are only in the location of their installation. Built-in ejectors can be placed inside the pump housing or mounted in close proximity to it. The built-in ejection pump has a number of advantages, which include:

minimum space required for installation;
good protection of the ejector from contamination;
there is no need to install additional filters that protect the ejector from insoluble inclusions contained in the pumped liquid.

Meanwhile, it should be borne in mind that built-in ejectors demonstrate high efficiency if they are used to pump water from sources of shallow depth - up to 10 meters. Another significant disadvantage of pumping stations with built-in ejectors is that they produce quite a lot of noise during their operation, so it is recommended to locate them in a separate room or in a caisson of a water-bearing well. It should also be borne in mind that the design of an ejector of this type involves the use of a more powerful electric motor, which drives the pumping unit itself.

A remote (or external) ejector, as its name suggests, is installed at a certain distance from the pump, and it can be quite large and reach up to fifty meters. Remote-type ejectors, as a rule, are placed directly in the well and connected to the system via a recirculation pipe. A pumping station with a remote ejector also requires the use of a separate storage tank. This tank is necessary to ensure that water is always available for recirculation. The presence of such a tank, in addition, makes it possible to reduce the load on the pump with a remote ejector and reduce the amount of energy required for its operation.

The use of remote-type ejectors, the efficiency of which is slightly lower than that of built-in devices, makes it possible to pump out a liquid medium from wells of considerable depth. In addition, if you make a pumping station with an external ejector, then it can not be placed in the immediate vicinity of the well, but can be mounted at a distance from the water intake source, which can be from 20 to 40 meters. It is important that the location of pumping equipment at such a significant distance from the well will not affect the efficiency of its operation.

Manufacturing an ejector and its connection to pumping equipment

Having understood what an ejector is and having studied the principle of its operation, you will understand that you can make this simple device with your own hands. Why make an ejector with your own hands if you can purchase one without any problems? It's all about saving. Finding drawings from which you can make such a device yourself does not present any particular problems, and to make it you do not need expensive consumables and complex equipment.

How to make an ejector and connect it to the pump? For this purpose you need to prepare the following components:

female tee;
union;
couplings, elbows and other fitting elements.

The ejector is manufactured according to the following algorithm.

IN bottom part The fitting is screwed into the tee, and this is done so that the narrow pipe of the latter is inside the tee, but does not protrude from its reverse side. The distance from the end of the narrow branch pipe of the fitting to the upper end of the tee should be about two to three millimeters. If the fitting is too long, then the end of its narrow pipe is ground off; if it is short, then it is extended using a polymer tube.
An adapter with an external thread is screwed into the upper part of the tee, which will connect to the suction line of the pump.
A bend in the form of an angle is screwed into the lower part of the tee with the fitting already installed, which will connect to the recirculation pipe of the ejector.
A bend in the form of an angle is also screwed into the side branch pipe of the tee, to which a pipe supplying water from the well is connected using a collet clamp.

All threaded connections, carried out in the manufacture of a homemade ejector, must be sealed, which is ensured by the use of FUM tape. On the pipe through which water will be drawn from the source, a check valve and a mesh filter should be placed, which will protect the ejector from clogging. For the pipes with which the ejector will be connected to the pump and storage tank, which ensures water recirculation in the system, you can choose products made from both metal-plastic and polyethylene. In the second option, installation does not require collet clamps, but special crimping elements.