An ejector is a device that is designed to transfer kinetic energy from one medium moving at a higher speed to another. The operation of this device is based on the Bernoulli principle. This means that the unit is able to create reduced pressure in the tapering section of one medium, which, in turn, will cause leakage into the flow of another medium. Thus, it is transferred, and after that it is removed from the place of absorption of the first medium.
Fixture Overview
An ejector is a small but very effective device that works in conjunction with a pump. If we talk about water, then, naturally, a water pump is used, but it can also be paired with steam, steam and oil, and steam-mercury, and liquid-mercury.
The use of this equipment is advisable if the aquifer lies quite deep. In such situations, it most often happens that conventional pumping equipment can not cope with providing water at home or delivers too little pressure. The ejector will help to solve this problem.
Kinds
An ejector is a fairly common equipment, and therefore there are several different types of this device:
- The first is steam. It is intended for suction of gases and confined spaces, as well as for maintaining vacuum in these spaces. The use of these units is common in a variety of technical industries.
- The second is steam jet. This device uses the energy of a steam jet, with the help of which it is able to suck out a liquid, steam or gas from an enclosed space. Steam that exits the nozzle at high speed entails a displaced substance. Most often used on various ships and ships for quick suction of water.
- A gas ejector is a device whose operating principle is based on the fact that the overpressure of high-pressure gases is used to compress low-pressure gases.
Water suction ejector
If we talk about the extraction of water, then the ejector for the water pump is most often used here. The thing is that if after drilling a well the water is lower than seven meters, then a regular water pump will cope with great difficulty. Of course, you can immediately buy a submersible pump, the performance of which is much higher, but it is expensive. But with the help of an ejector, you can increase the power of an existing unit.
It is worth noting that the design of this device is quite simple. Making a homemade fixture also remains a very real challenge. But for this you have to work on drawings for the ejector. The basic principle of this simple apparatus is that it gives the water stream additional acceleration, which leads to an increase in the supply of fluid per unit time. In other words, the task of the unit is to increase the pressure of water.
Compound elements
Installation of an ejector will lead to the fact that the optimal level of water intake will greatly increase. Indicators will be approximately equal to 20 to 40 meters in depth. Another advantage of this particular device is that its operation requires much lower energy costs than, for example, a more efficient pump will require.
The pump ejector itself consists of such parts as:
- suction chamber;
- mixing unit ;
- diffuser;
- narrowed nozzle.
Principle of operation
The principle of operation of the ejector is completely based on the principle of Bernoulli. This statement says that if you increase the speed of a stream, a region with a low pressure will always form around it. Because of this, an effect such as discharge is achieved. The liquid itself will pass through the nozzle. The diameter of this part is always smaller than the dimensions of the rest of the structure.
It is important to understand that even a slight narrowing will significantly accelerate the flow of incoming water. Next, water will flow into the mixer chamber, where it will create a reduced pressure. Due to the occurrence of this process, it will happen so that through the suction chamber a liquid will fall into the mixer, the pressure of which will be much higher. This is the principle of the ejector, if described briefly.
It is important to note here that water should not enter the device from a direct source, but from the pump itself. In other words, the unit must be mounted so that some of the water that rises with the pump remains in the ejector itself, passing through the nozzle. This is necessary in order to be able to supply constant kinetic energy to the mass of liquid that needs to be raised.
Thanks to the work, in this way a constant acceleration of the flow of matter will be maintained. Among the advantages, it can be distinguished that the use of an ejector for a pump will save a large amount of electricity, since the station will not work at the limit.
Type of device for pump
Depending on the installation location , the unit can be built-in or remote type. There is no huge structural difference between the installation sites, however, some small differences will still make themselves felt, since the installation of the station itself and its performance will slightly change. Of course, it is clear from the name that the built-in ejectors are installed inside the station itself or in the immediate vicinity of it.
This type of unit is good in that you do not have to allocate additional space for its installation. The installation of the ejector itself also does not have to be carried out, since it is already built-in, it will only be necessary to install the station itself. Another advantage of such a device is that it will be very well protected from various kinds of pollution. The disadvantage is that this type of apparatus will create a lot of noise.
Model Comparison
Remote equipment will be more difficult to install and you will have to allocate a separate place for its location, however, the amount of noise, for example, will be significantly reduced. But there are other disadvantages. Remote models are able to provide effective work only at a depth of 10 meters. Built-in models are initially designed for not too deep sources, but the advantage is that they create a fairly powerful pressure, which leads to a more efficient use of fluid.
The created jet is quite enough not only for domestic needs, but also for operations such as watering, for example. The increased noise level from the built-in model is one of the most significant problems that will have to be taken care of. Most often, it is solved by the fact that the pumping station, together with the ejector, is installed in a separate building or in the well box. You will also have to attend to a more powerful electric motor for such stations.
Connection
If we talk about connecting a remote ejector, you will have to perform the following operations:
- Gasket additional pipe. This object is necessary in order to ensure the circulation of water from the pressure line to the water intake plant.
- The second step is to connect a special pipe to the suction port of the water intake station.
But the connection of the built-in unit will not differ from the usual installation process of the pumping station. All necessary procedures for connecting the necessary pipes or nozzles are carried out at the factory.