In places where it is not possible to connect to centralized system water supply, use an ejector pump. The main purpose of such units is to lift water from wells of different depths, from wells and other recesses and create healthy competition with well-known well pumps that operate using the immersion method. Such powerful devices can lift water from a depression to a height of more than 8 meters from depths reaching 50 meters.
Many owners land plots could encounter such a problem as a deep aquifer. But, as you know, it is absolutely impossible to do without water, so people find a solution to this problem by installing an ejector pump on their site.
Unfortunately, surface equipment using pumps does not always bring positive results and cannot always provide water. Sometimes water is completely absent, and sometimes it enters the system, but very slowly and without pressure. It is in such cases that it is best to use an ejector water supply pumping station.
Types of ejector pumps and their application features
The injection pump can be presented in several varieties:
How the device works
The injection pump has quite simple basis work and many people are trying to create an ejector pump with their own hands. Moreover, before understanding the principle of operation, you need to know what such a unit consists of:
- A nozzle through which liquid flows, accelerating and leaving the unit at a higher speed. It is the high water speed that allows you to avoid unnecessary high pressure to the surrounding planes.
- A mixing device into which water flows from a nozzle. It is in the mixing device that the liquid is discharged throughout its entire volume.
- The suction chamber where water from the well enters.
- A diffuser that moves all the liquid further along the existing pipeline.
By and large, the operating principle of a water injection pump is the process of transferring kinetic energy from water to high speed to the aquatic environment at low speed.
Almost everyone who was involved in the arrangement autonomous water supply, was faced with the problem of insufficient water supply to the suction pump. From the physics course we know that Atmosphere pressure allows water to be supplied from a maximum depth of 9 meters. In practice, this figure decreases to 7 and even 5 m of confident delivery. An ejector for pumping station, allowing you to increase water pressure. The industry produces such equipment, which is part of pumping stations and pumps.
Design and principle of operation of the installation
An ejector is a device that transfers the energy of a medium moving at high speed to another, less mobile one. In the tapering section of the apparatus, a zone of low pressure of one of the media appears, provoking the suction of the second medium into its flow.
This allows it to move and move away from the suction point, using the energy of the first medium to move.
Internal structure of the ejector. This equipment is used to provide additional meters of water lift and insure the pump or station against unwanted dry running in the event of a sudden drop in the well level
Installations with an internal ejector are intended for pumping water from shallow, no more than 8 m, wells, storage tanks, wells or reservoirs. Distinctive feature devices - the ability of “self-priming”, which allows you to capture water located below the level of the inlet pipe. Therefore, for the device to operate correctly, it is necessary to first fill it with water. The impeller of the device pumps liquid and sends it to the entrance to the ejector, thereby creating an ejection jet.
She accelerates as she moves along the tapering tube. Accordingly, the pressure inside the jet decreases. Thus, the pressure inside the suction chamber also decreases significantly. If you connect a pipe to the inlet pipe and lower it into water, it will begin to be forcefully sucked into the device. Next, the liquid is sent to the suction chamber, slows down and is directed through the diffuser to the outlet, gradually increasing its pressure.
Pumping station with external (left) and internal (right) ejector. Equipment with a remote ejector can be installed at a considerable distance from the well or well
Another variety surface installations– pumping station with a remote ejector. They are distinguished by the presence of an external ejector immersed in the source of water supply. The design and scope of application of the installations are generally the same as those of analogues with an internal ejector. Significant difference– the possibility of using the device at depths of more than 10 m. In addition, such pumps are extremely demanding on the conditions for installing an external ejector. The pipes connecting it to the pump must be installed strictly vertically, otherwise the inlet line may become air-filled and become inoperable.
It is most optimal to use such a device to work at a depth of 15-20 m, although some manufacturers indicate a maximum depth of 45 m. It is clear that with increasing lifting height, the operating characteristics of the pump deteriorate. In general, devices with an external ejector have lower efficiency than those with an internal one.
It is only 30%. But they allow you to get rid of the noise created by the device, and make it possible to place the installation several tens of meters from the well.
Self-production of an ejector
It is quite possible to make the simplest device yourself. You will need a tee for this. required diameter and a fitting that should be located inside this tee. If the fitting is too long, it will need to be cut or ground. If, on the contrary, it is short, then add a vinyl chloride tube of the required length, matching the diameter of the fitting. Since the device will need to be mounted on the pump, you will also need an adapter with angles that form the necessary rotation with the transition to the pipe.
Ingredients for self-assembly ejector: 1- tee; 2 - fitting; 3 - vinyl chloride tube; 4 - adapter for metal-plastic pipe; 5 - NxMP angle; 6 - angle НхВ; 7 - NxMP angle
The ejector manufacturing process takes place in several stages:
- Preparing the fitting. The hexagonal element of the part must be ground to form a cone with a base slightly smaller than the diameter of the external thread of the fitting. The threaded part is shortened; no more than four threads can be left. Then, using a thread-cutting tool, we straighten the damaged thread and continue it by approaching the conical part, so that the fitting can be easily screwed into the tee.
- Fitting ejector parts. Screw the fitting into the tee until it stops with the narrow part. In this case, the outlet hole should not extend beyond the middle hole of the tee by more than 1-2 mm. In addition, the internal thread of the tee must be left with no less than 4 threads. If it turns out that the thread of the tee is missing, we grind down the thread of the fitting a little more. If the outlet hole of the fitting is short, we put a vinyl chloride tube on it, if it is long, we grind it off.
Assembling the device
- . We check the compliance of the parts and finally screw in the fitting, making sure to seal the threads with any suitable sealant. Next, we assemble the necessary adapter from the prepared elements for mounting on the pipe.
Scheme for connecting our homemade ejector to the pumping station line
An ejector is an indispensable device for increasing water pressure and providing protection against unwanted dry running of the supply unit. It can be purchased complete with a pumping station, or you can assemble it yourself. In any case, it will work for a long time and efficiently, ensuring an uninterrupted supply of water even from a deep well.
Ejector - what is it and how does it work? Any hydraulic engineer who understands the essence of converting the energy of a mixed jet into pressure in a pipeline knows the exact answer to this question. For consumers of water from a well who are uninitiated in the intricacies of engineering, it is enough to understand the fact that this unit of pressure equipment allows the pump to pump water from depths of more than 15-20 meters. But if you want to assemble an ejector with your own hands, improving your pump, then you will need to understand the essence of this device practically at an engineering level. And this article will help you understand what an ejector is, how it works and how to assemble such a unit on your own.
What is an ejector and how does it work?
From the point of view of the physics of the process, an ejector is a typical ejector that pumps up pressure in a pipeline channel. It works in tandem with a suction pump that draws water from a well or well.
The essence of the operation of this unit is to throw a jet of liquid accelerated to high speed into the pipeline or working chamber of the pump. Moreover, acceleration is carried out by passing through a smoothly tapering section. Due to the difference in the speed of movement of the main flow and the mixed jet, a vacuum region is created in the chamber of the unit, which increases the suction force in the pipeline.
The air ejector, the liquid ejector, and the gas-liquid unit operate on this principle. In physics, the mechanics of the operation of such units is described by Bernoulli’s law, formulated in the 18th century. However, the first working ejector was assembled only in the 19th century, or more precisely in 1858.
Ejector pump - operating principle and expected benefits
Modern ejectors accelerate the pressure in the pipeline, consuming about 12 percent of the volume of the pumped flow. That is, if 1000 liters per hour flow through the pipe, then for efficient work the ejector will require an output of 120 l/h.
The pump supports next principle ejector operation:
- An outlet is cut into the pipe behind the pump.
- Water from this outlet is supplied to the circulation pipe of the ejector.
- The suction pipe of the ejector is connected to a pipe lowered into the well, and the pressure pipe is connected to the entrance to the working chamber of the pump.
- The pipe must be mounted on a pipe lowered into the well. check valve, blocking the downward movement of water.
- The flow supplied to the circulation pipe moves at high speed, creating a vacuum in the suction zone of the ejector. Under the influence of this vacuum, the suction force (water lift) and the pressure in the pipeline connected to the pump increase.
A pump equipped with an ejector begins to draw water from a well more than 7-8 meters deep. Without an ejector, this process is impossible in principle. Without this unit, a suction-type unit is capable of lifting water only to depths of 5-7 meters. And the ejector pump pumps water even from a depth of 45 meters. Moreover, the operating efficiency of such pressure equipment depends on the types of ejectors used.
Types of ejectors - classification by location
The ejector, the operating principle of which we described above, is mounted only on surface pumps. Moreover, there are two installation schemes:
- Internal placement is where the ejector is built into the pump casing or somewhere nearby.
- External placement - in this case, the ejector is mounted in a well, where, in addition to the main pipeline, a circulation branch is also installed.
The internal ejector for the pump provides a 100% guarantee of safe operation of the ejector. In this case, it is protected from silting and mechanical damage. Besides, internal installation reduces the length of the circulation pipeline. The biggest drawback of this scheme is the slight increase in suction depth. An internal ejector - what it is and what benefits it provides, we have already explained above - allows a surface pump to pump water only from a depth of 9-10 meters. You can’t even dream of 15-40 meters here. You will also be haunted by the sound of water beating, propagated by the housing of the built-in equipment.
An external ejector promises benefits such as virtually silent operation (the source of the beating is located in the well) and the generation of significant vacuum, sufficient to lift water from a well up to 45 meters deep. The annoying disadvantages of this scheme include, firstly, a drop in the efficiency of pressure equipment by about a third, and secondly, the need to install primary filters that regulate the flow frequency (such a unit is afraid of silting).
However, if you are planning to construct an ejector with your own hands, then the most affordable option there will be an external node. This is what we will consider below in the text.
Self-production: step-by-step instructions
If you decide to make an ejector with your own hands, you will not need drawings, since a simplified model of the external unit can be assembled from standard tees, fittings and fittings and angles for water supply. Moreover, only two adjustable wrenches can be used as working tools, and the only consumables you will need are FUM tape.
The complete list of parts for a homemade ejector is as follows:
- A fitting with an external thread and a brush for installing hoses. It will act as a nozzle from which a high-speed stream of water is ejected.
- Tee with internal thread, the diameter of which must coincide with the external thread of the fitting. This element will be used as a housing.
- Three angles with threaded and collet ends. With their help, you can streamline the laying of circulation, suction and pressure pipelines.
- Two or three collet or crimp fittings, which are used to connect pipelines. Moreover, the last option requires using additional tool– crimp wrench
The assembly process itself begins with preparing the fitting. A hexagon protruding above the threaded end is ground off from it. Next, the treated fitting is screwed into the tee from the side of the through channel, obtaining the basis for the circulation pipe. In this case, the end with the brush (fitting) should not extend beyond the boundaries of the tee. If this happens, it will have to be cut down.
To complete the installation of the circulation pipe, a corner bend with threaded ends is screwed into the tee, following the fitting, and then onto the free part of this element screw on another corner, getting a U-shaped loop with a fitting end. It is to this fitting that the circulation pipe from the pump will be attached.
The next step is preparing the pressure end. To do this, a fitting with an external threaded end and a collet is screwed into the free through end of the tee (it is located above the equipped circulation outlet). The pipe from the ejector to the pump will be attached to this collet.
The last stage is the arrangement of the suction end. In this case, we simply screw a fitting angle with an external thread and a collet clamp at the other end into the side outlet of the tee. Moreover, the collet should look down, towards the circulation pipe. And a suction pipe laid to the bottom of the well will be attached to this fitting.
Secrets of success - how to increase the efficiency of a homemade design
Firstly, the diameter of the circulation pipe must be half the size of the pressure and suction lines. Thanks to this, the flow will receive a high speed even as it approaches the fitting that replaces the nozzle.
Secondly, it is better not to lower the suction pipe to the very bottom of the well - it should be located at least a meter away. And even better - at a distance of 1.5 meters from the bottom. This way you can avoid silting.
Thirdly, you need to screw a check valve onto the end of the suction pipe, cutting off the flow of water downwards, and it would be a good idea to place a coarse strainer behind the valve. This increases the efficiency of the ejectors and reduces the risk of silting of the structure.
An ejector is a device capable of transferring kinetic energy from one medium to another. An ejector for a pumping station helps lift water from sources more than ten meters deep and is used to protect the engine during a sharp drop in water level.
You can buy the device in a store or make an ejector for a pumping station with your own hands.
Principle of operation
The ejector works sufficiently simple principle. The water is recirculated at the bottom of the pipeline, thereby filling the lack of pressure in the suction pipeline. The ejector pushes the water to the height from which the engine can draw it.
The water coming out of the tapering T-shaped pipe is poured into the mixer at high speed from the suction chamber. In the diffuser, the normal flow of water is mixed 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 that rises returns back to the well, and forms a constant recirculation on the way to the ejector. Additional vacuum occurs 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 pumping station starts up faster, energy consumption is reduced, and the installation of lower power equipment 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 for pumping water from shallow wells, storage tanks and other water sources. They are distinguished by their ability to capture water located below the pipe.
The built-in ejector is installed inside the pump. This solution makes it possible to significantly reduce the size of the station. IN in this case installation of a filter is not required; the pump with a built-in ejector is not sensitive to sand particles suspended in the water. Such stations are primarily used for irrigation systems and with wells up to ten meters deep; it is not recommended to install them for water supply to residential buildings - they operate very noisily.
Pumping station with built-in ejector
When installing the ejector as a separate unit, it is required additional tank for water and removing load from the engine. The ejector is connected between the well and the engine to the part of the pipeline located in the water. For trouble-free operation of the device, two pipes are laid, as well as a pipe with a coarse filter and a check valve. To prevent airing of the system, pipes are installed strictly in a vertical position.
A station of this type operates almost silently and supplies water from wells up to fifty meters deep (optimal depth is from 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 low compared to a built-in one, but this disadvantage is compensated by the ability to supply water from considerable depths. Stations can be located several tens of meters from the source.
Self-production of an ejector
The cost of the ejector is quite high, and they are not always on sale. It is not difficult to make an ejector for a pumping station with your own hands.
Let's consider step by step instructions self-made a conventional ejector, capable of facilitating the rise of water from wells up to 10 m deep, and used to draw water from greater depths.
Making an ejector is not a difficult task!
Will be required following materials and tools:
- A half-inch tee with internal thread is the main part;
- A half-inch fitting with a 12 mm or three-quarters 8-10 mm outlet, we will insert it inside the tee. Serves as a conductor of water under high pressure. To extend the fitting, you can use a vinyl chloride tube of the same diameter as the fitting;
- Adapter 20x25 mm with the necessary angles for further mounting on a pipe or three-quarters with an external thread at one end, and with a thread at the other end metal-plastic pipe diameter 16 mm;
- Fitting;
- 90 degree corners for metal-plastic pipes:
- ¾ with external thread x ½ with internal thread;
- ¾ with external thread x 26 mm with internal thread for a metal-plastic pipe;
- ½ with external thread x 16 mm with internal thread for a metal-plastic pipe;
- Grinder, plumbing keys, adjustable wrench, sandpaper;
- A coupling with a three-quarter diameter (or clamp, screw) for straightening the threads on the fitting;
- A vice, but you can do without them.
If the well depth exceeds 10 m, it will be necessary to install an ejector of more than 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 you will need the following parts:
- threaded pipe with a diameter of half an inch;
- ten-millimeter nozzle;
- tee E40;
- half-inch and three-quarter locknuts;
- check valve with coarse filter;
- plugs with holes and threads for fittings;
- half inch and three quarters cut;
- 90 degree bend half inch;
- nozzle or compressed copper tube with longitudinal holes and sealed seams.
First of all, it is necessary to grind off the hexagon of the fitting until it is shaped like a cone. The outer diameter of the fitting thread should be 2-3 mm larger than the lower base of the resulting cone. The length of the thread should be four turns. We cut off the excess length.
Then you need to align the threads, which will be disrupted when turning the part. We cut the thread longer so that it fits onto the cone and you can later screw it from any edge into the coupling or tee.
Screw the fitting into the tee until it stops. It should fit 2 mm upward into the tee outlet from the side.
There should be four or more turns left on the internal thread of the tee for attaching the outlet to them. If there are fewer turns left, grind the threads on the fitting until it reaches required parameters. If the thread is short, you can add it to the required size using a vinyl chloride tube. The fitting should not protrude from the tee by more than 3 mm.
Ejector installation
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 into a well or other source of water supply.
In this case, several pipes will be needed for installation:
- pipe with installed filter coarse cleaning is connected to the tee on the side and goes down to the very bottom;
- a pipe connected from below through which the emerging high-speed flow of water passes;
- a third pipe that connects to the tee from above and is discharged into the water supply system, through which an accelerated flow of water passes under high pressure.
Ejector connection diagram
We screw an adapter with an external thread onto the tee from above. It should be located above the fitting. The second edge will serve as a connection to the pipe supplying water to the water supply. It will be secured with a fitting.
From below, we screw the corner elbow to the tee (into which the fitting was previously inserted) for further connection with the recirculation pipe. Fastening is done with a crimp nut.
We screw a corner into the tee on the side to connect it to the water supply pipe. We secure the pipe with a collet clamp.
We check the quality of fastenings and waterproofing.
All joints are sealed with tow or sealant.
We must install a check valve at the outlet. It will prevent liquid from flowing out of the suction pipe. If the water leaves, the system will not be able to work.
How to extend the service life of the ejector?
To extend their service life, pumping stations with an ejector must be operated in compliance with the following rules:
- When installing a station, it is important to correctly calculate the ratio of the power of the device and the depth of the source from which water is extracted.
- 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;
- 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;
- the use of a built-in ejector is justified only at high-power stations;
- when the source depth is from 15 to 40 meters, it is necessary to use a remote ejector installed inside the well and located in the water.
- When using a surface-type pump, it is important to correctly install the pipes coming from the surface of the ejector - strictly vertically. If the pipes are positioned incorrectly, air will enter the system and form air jams, which will negatively affect the operation of the system and reduce its service life.
If all operating rules are observed, ejector pumping stations operate smoothly and provide tap water house, watering and other equally important household needs.
Video
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 is used, 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
In my own way design and operating principle, ejector pumps can fall into 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 type ejectors can be placed in inner part pump housing, or be 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 kept in mind that high efficiency built-in ejectors are demonstrated 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 emit quite a lot of noise during their operation, so it is recommended to place them in separate room or in the 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 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 will 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.
- A fitting is screwed into the lower part of the tee, and this is done so that the narrow branch pipe of the latter is inside the tee, but does not protrude from it. 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. As 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 from both metal-plastic and polyethylene. In the second option, installation does not require collet clamps, but special crimping elements.
