The pumping pump of the diesel engine is a low pressure fuel pump (VALVES). The main task of this device is the function of fuel supply to the high-pressure fuel pump. Usually, the pumping pump is mounted on the "box" of the pump or in the immediate vicinity of the high pressure pump.
Both pumps are connected by fuel pipes, on which diesel fuel is supplied from the VALVE to PNVT. In parallel, the purification of diesel fuel was implemented, which provides a pass through special fuel filters for coarse and fine cleaning. Next we will consider the device, as well as the principle of operation of the fuel pump pumping in more detail.
The pumping pump of the diesel engine for TNVD
so, low pressure fuel pump (VALVES) needed for that, to pass diesel fuel under filters under low pressure and then to supply fuel to the fuel pump. There are two modes of operation of the device. The first mode is the so-called preparatory, while the second operating mode.
As for the preparatory regime, at this point the piston in the pump moves up, the influence of the eccentric is noted in parallel, which compresses the spring. As a result, the fuel begins to move in the chambers, and passes between the filters. The operating mode of the VALVE is the return movement of the piston (piston moving cart).
It is worth noting, pumping a low pressure pump a little more fuel, than the engine needs for smooth operation. This pumping "with a margin" allows you to maintain optimal pressure in the supply system, avoiding increasing loads.
Pumping device and different types of VALVE
If we talk about the design, the low pressure fuel pump has the following components:
- Drive shaft
- Rotor with blades
- Stator
- Partition disk
- I will drive the gear-regulator
- Couplings
The principle of operation is, that the rotor first begins to move, as a result, its blades approach the stator. As a result, under the influence of centrifugal force, "chambers" and a certain voltage are created. Then from the chambers the fuel enters the PNVT. Distribution channels are made for fuel supply in a disk. If the pressure exceeds the norm, part of the fuel is redirected to the pressure reducing valve.
With that in mind, that the booster pump and the high pressure pump are connected, for, to maintain the necessary conditions, there is a fuel drain. The specified choke is a nozzle, which is screwed into the pump.
This solution allows you to maintain the desired conditions in the cells, this takes into account the dependence on that speed, with which the drive shaft moves. This scheme is well suited for diesel engines, there are other types of booster pumps.
Varieties of low pressure fuel pumps
Let's start with that, that a low pressure fuel pump is installed on any car, petrol (carburetor, injector), and on many diesels, but not at all. This device "pulls" fuel from the tank, after which the fuel passes through filters, enters the dosing system and is fed to the engine.
Thus pumping pumps happen mechanical and electric. On gasoline (carburetor internal combustion engine is a mechanical pump, on injector motors the pumping fuel pump is electric. However, if in gasoline analogues, regardless of engine type, such a pump is the main one, in diesel engines, the booster pump supplies fuel to the pump.
- Mechanical booster pump, usually, is placed on the cylinder block. Such a device is actuated by the engine itself. If simple, while the motor is rotating, a special pump cam is pressed, as a result, the device begins to inject fuel into the carburetor. The mechanical pump also has a special lever, which allows you to manually pump gasoline before starting the engine.
We also recommend reading the article about it, how the diesel injector is arranged and works. In this article you will learn about the design and principles of operation, as well as features of the device of diesel injectors.
- An electric booster pump became a necessity after that, how injector engines came into being. The point is, that for normal operation of the injector fuel should be supplied to the injectors under higher pressure compared to carburetor engines.
Naturally, weak in performance mechanical pump is not able to cope with this task. He was replaced by an electric fuel pump. Such a pump is actually an electric motor and a pump chamber, which are united in the general case. The supercharger is located directly in the gas tank and immersed in fuel. Also in the case of the pump the sensor of level of fuel and the special grid filter for cleaning of fuel is integrated.
This solution has a number of advantages, since the device is more productive, and does not overheat from excess heat in the hood space. There is also no need to pump fuel manually before starting the engine, since after turning the ignition key the booster pump starts working immediately, raising the pressure in the supply system.
It should also be noted, that in the scheme with the electric pump fuel constantly moves on highways, which allows you to maintain a normal fuel temperature and avoid overheating.
Advantages of installation of the pumping pump on diesel
If we return to the main topic, the diesel pump is in many cases electric. Such a pump becomes an important element in the power system, as it allows not only to quickly and efficiently supply diesel fuel to PNVT, but also to pass diesel fuel through filters.
Also presence of the pumping pump allows to reach stable work of the diesel engine at all modes and at any turns., that is, the lack of fuel under load is excluded. We will note still, that many diesel car owners, which do not have an additional pump, decide to install it yourself.
This need can be due to various reasons, starting with a slight airing of the power supply system after parking and ending with the desire to facilitate the start of the diesel engine. The pump can be placed as in a fuel tank, and to integrate diesel fuel supply lines on certain sections of the fuel lines after the tank.
We also recommend reading the article about it, what is PNVT (high pressure fuel pump). In this article you will learn about the purpose, principles of operation, as well as design features of pumps of this type.
Usually, after installation, the owners note, that the diesel is easier to start (you need to make less speed with the starter). There is also a more stable operation of the internal combustion engine in different modes (transient modes, XX, work under load). In some cases, an increase in power is possible, as fuel is stably supplied to PNVT even at high turns.