Ejector - what is it? Description, device, types and features

2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16

An ejector is a device that is designed to transfer kinetic energy from one medium moving at a higher speed to another. This device is based on the Bernoulli principle. This means that the unit is able to create a reduced pressure in the narrowing section of one medium, which, in turn, will cause suction into the flow of another medium. Thus, it is transferred, and then removed from the place of absorption of the first medium.

General information about fixture

Ejector is a small but very effective device that works in tandem with a pump. If we talk about water, then, of course, a water pump is used, but it can also work in tandem with steam, steam-oil, steam-mercury, and liquid-mercury pumps.

The use of this equipment is advisable if the aquifer lies quite deep. In such situations, it most often happens that conventional pumping equipment cannot cope with providing water to the house or it supplies too little pressure. The ejector will help solve this problem.

Views

Ejector is a fairly common equipment, and therefore there are several different types of this device:

• The first one is steam. It is intended for exhausting gases and confined spaces, as well as for maintaining vacuum in these spaces. The use of these units is common in various technical industries.
• The second one is steam jet. This apparatus uses the energy of a steam jet, with the help of which it is able to suck liquid, steam or gas from an enclosed space. The steam that exits the nozzle at high speed entails the substance being moved. Most often used on various ships and ships for quick suction of water.
• A gas ejector is a device whose principle of operation is based on the fact that the excess pressure of high-pressure gases is used to compress low-pressure gases.

Ejector for water suction

If we talk about water production, then the ejector for the water pump is most often used. The thing is that if, after drilling a well, the water is lower than seven meters, then an ordinary 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. The production of a makeshift device also remainsquite a real challenge. But for this you will have to work hard on the drawings for the ejector. The basic principle of operation of this simple apparatus is that it gives the flow of water an additional acceleration, which leads to an increase in the supply of liquid per unit of time. In other words, the task of the unit is to increase the pressure of the water.

Composition elements

Installation of an ejector will lead to the fact that the optimal level of water intake will greatly increase. The indicators will be approximately equal from 20 to 40 meters in depth. Another advantage of this particular device is that its operation requires much less electricity than, for example, a more efficient pump would require.

The pump ejector itself consists of parts such as:

• suction chamber;
• mixing unit;
• diffuser;
• narrowed nozzle.

Working principle

The principle of operation of the ejector is completely based on the Bernoulli principle. This statement says that if you increase the speed of any flow, then an area with low pressure will always form around it. Because of this, such an effect 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 here that even a slight narrowing will significantly speed up the flow of incoming water. Next, the water will enter the mixer chamber, where it will create a reduced pressure. because ofthe occurrence of this process will occur in such a way that a liquid will enter the mixer through the suction chamber, the pressure of which will be much higher. This is the ejector principle in a nutshell.

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 in such a way 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 lifted.

Thanks to the work in this way, a constant acceleration of the flow of matter will be maintained. Of the advantages, it can be distinguished that the use of an ejector for the pump will save a large amount of electricity, since the station will not work at its limit.

Pump device type

Depending on the installation location of the unit, it 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 will change slightly, as well as its performance. Of course, it is clear from the name that the built-in ejectors are installed inside the station itself or in its immediate vicinity.

This type of unit is good because 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, sinceas it is already installed, only the station itself will need to be installed. 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 quite a lot of noise.

Comparison of models

Remote equipment will be somewhat more difficult to install and you will have to allocate a separate place for its location, but the amount of noise, for example, will decrease significantly. But there are other shortcomings here. Remote models are able to provide effective operation only at a depth of up to 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 more efficient use of the liquid.

The generated 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 installing a pumping station together with an ejector in a separate building or in a well caisson. You will also have to take care of 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:

• Laying an additional pipe. This object is necessary in order to ensure the circulation of water from the pressure line to the water intake.
• The second step is to connect to the suction port of the water intakespecial nozzle station.

But connecting the built-in unit will not differ in any way from the usual process of installing a pumping station. All necessary procedures for connecting the necessary pipes or nozzles are carried out at the factory.