Single-path pressure spray pump head and dual-path spra […]
Single-path pressure spray pump head and dual-path spray pump head
First, the working principle of single and double pressure of spray pump head
The single-channel pressure spray pump head is also called a simple centrifugal nozzle. As the name implies, it uses the swirling member in the nozzle to generate liquid rotation, and accelerates the spraying of FFJ death heart diffusion cone-shaped oil film in the convergence channel, using the high-speed difference between the liquid and the outside air And broken and atomized. The centrifugal force of the swirling flow is used, so the swirler is the key piece. The swirl chamber and nozzle connected to the swirler (piece) are equally important. They can be combined into one body (collectively called the atomizer), or they can be separated into a single piece.
The dual oil pressure spray pump head has two oil paths (main, auxiliary oil paths or primary and secondary oil paths) for oil supply. When the fuel supply in the combustion chamber is low, that is, under low operating conditions (such as the engine is slow), only the auxiliary oil path (one way) is supplied. As the fuel supply increases, the fuel pressure rises to a certain value. The oil separation valve (spring-type valve) inside or outside the nozzle is opened, and the main and auxiliary oil paths supply oil at the same time. The dual channel is an improvement of the single-channel pressure spray pump head. Its outstanding advantage is that the oil volume can be adjusted in a wide range, and it can ensure low operating conditions (low oil supply). Due to the small diameter of the auxiliary oil nozzle, the oil pressure can still be Higher, can obtain better atomization quality (especially for nozzles with two-way dual-chamber and dual-nozzle, and can be obtained by reliably increasing the swirling speed with two-way single-nozzle nozzles), which can meet different working conditions of aviation gas turbine at high and low altitude Requirements for stable combustion and complete combustion. Therefore, two-way nozzles have been widely used in aviation gas turbines, and they have also been widely used in ground gas turbines.
Second and double pressure structure characteristics of spray pump head
Single-path pressure spray pump head has simple structure and good atomization quality, and is widely used in various types of combustion devices. Although the oil volume adjustment ratio is small, it has been widely used in aircraft afterburner. Currently in the main combustion chamber The upper is still used as the starting nozzle and the working nozzle, and the combined atomizing device in the high-performance aviation gas turbine is used as the towel heart nozzle. In addition, in non-combustion equipment, such as spray drying equipment, the pressure atomization method also uses a single-channel pressure spray pump head. It is also used by burners (or burners) on industrial furnaces and boilers.
There are many types of dual-path pressure spray pump heads. Here we introduce three-phase spray pump heads with two structures: single-channel single-chamber single-nozzle, dual-channel double-chamber single-nozzle, and dual-channel dual-chamber double-nozzle nozzles.
In order to accurately design and calculate the single-path pressure spray pump head and the dual-path spray pump head, the design methods currently used are based on the maximum flow principle method and the momentum equation method. In addition to this, we have created or improved many methods for designing juice.