Ejektoinzenjering d.o.o

  • Company for the production and sale of ejectors - injectors

  • Smaller size for more power

About Ejectors General Information

EJECTORS (INJECTORS) OR JET PUMPS belong to the group of jet machines.

Compared with other pumps they have a series of advantages:

  • simple construction,
  • small mass and dimension,
  • easy to handle and maintain,
  • no mobile parts,
  • do not require lubrication,
  • easily mounted in all positions,
  • do not require special bases,
  • stable, quiet and noiseless operation,
  • allow regime change in wide ranges,
  • cheep,
  • long lifetime.

One of their characteristics is that they do not require driving engines as they use the energy of input fluids for driving.

Based on the theory we developed, many experiments and great experience on many different types of installations optimization of current and geometric parameters was performed enabling operation with a high degree of utilization.

n = 0.25 – 0.75

Ejectors are widely applied in many fields. In the last few years several patents have been registered in the world and this country (our patents) that give new original solutions simplifying existing technological procedures.

Ejectors are suitable for automation with minimal occasional work control.

Ejectors consist of:

  • jets with a driving fluid attachment,
  • mixing chamber with an attachment for fluid intake,
  • diffuser with an emptying attachment.

Principle of ejector operation: All types of ejectors, regardless of their purpose and size, operate on the same principle. For operation they use energy of the input fluid. Fluid with a higher input pressure is called a driving fluid, while fluid with a lower input pressure is pumped in. Several different fluids can be pumped in at the same time.

All fluids can be used as driving or pumped: liquids (emulsions, suspensions), gasses, vapor and all other materials that can become liquid. All combinations are possible.

Ejector construction was performed so that the fluid pumped in is taken in, compressed and then driven with the energy of the driving fluid.

Main ejector operations are:

  • drive,
  • pumping in and mixing,
  • emptying.

Figure 1 - Ejector scheme

  sema_ejektora2Dr Ljubomir Petrovic, founder of this company defended his PhD thesis titled: “Theoretical determination of optimal current and geometric ejector parameters” at the Faculty of Mechanical Engineering in Belgrade in 1981.

Taking in with mixing

At the entrance to the mixing chamber particles of the driving fluid meet particles of the pumped fluid. They collide with each other, mix with them and take them along. Neighboring particles of the inlet port move into the space left by the removed pumped fluid thus forming a stream in the direction of the diffuser. On their path through the chamber particles of the driving fluid surrender part of their energy and slow down and particles of the pumped in fluid accept part of the energy and accelerate. In the ejector chamber due to different stream rates both fluids are broken into the smallest particles and large active interacting surfaces form. The large active surface enables formation of a completely homogeneous mixture with a fast interchange of energy (mechanical, heat and chemical).

Drive

Driving fluid (emulsion, suspension), gas or vapor passing through the nozzle transfers most of its thrusting energy into kinetic (speed) energy thus forming a stream jet that enters the mixing chamber at great speed (for gas and vapor above the speed of sound).

Material

Ejectors are made of metal, plastic, Teflon and other solid and hard materials.

Special requests

We can send more complete and detailed prospects with in depth explanation on ejector possibilities and their application. We provide help with ejector selection and solution of all other technical problems connected with their application.

We offer

Service of complete engineering of processing equipment and installations using the “key in hand” principle (projecting, construction, reconstruction, delivery, installation and operation).

Emptying

Entering the diffuser, due to expansion of the stream space, the mixture stream slows down, its rate decreases and the pressure increases (kinetic energy transforms into thrusting energy) all until the ejector output. The output pressure depends on the ratio between the pressure and flow of the taken in and driving fluid and is always higher than the pumped fluid pressure and lower than the driving pressure.

Working conditions and application

Ejectors can be used for taking in and pumping, compressing and thrusting all types of fluid and fluidized material. They can be used for low and high pressure, small and large flows, low and high temperatures.

Guarantee

A quality guarantee for delivered ejectors is up to 5 years. The agreed ejector characteristics are guaranteed. Quality certificates can be issued at purchaser request.
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