The hot oil pump is working

The radial force acting on the circumferential direction of the impeller changes when the hot oil pump is working, because the impeller is affected by the hydraulic pressure and the meshing force of the impeller, while the hydraulic pressure changes along the circumferential direction of the impeller.

Fluent can obtain the pump pressure at every moment. Due to the rotation of the impeller, the liquid oil in the oil suction chamber in the intertooth area is transported to the oil pressure area. The pressure in the oil suction area decreases due to the decrease of the oil, while the pressure in the oil pressure area increases as the oil increases.

The oil suction area will suck the oil from the cylinder into the oil suction area due to the decrease of the pressure, and the oil pressure area will output the oil out of the pump due to the increase of the pressure. The impeller will rotate continuously, and the hot oil pump can continuously convert the low pressure oil into high pressure oil output.

Formed between the two meshing tooth of relatively closed cavity, in hydraulic oil closed cavity caused by trapped oil, trapped oil may reduce or increase the volume, volume increased use of oil temperature increase, the pressure increases sharply, the impeller to the meshing impact, when trapped oil bigger, easy to produce cavitation and vibration, affecting the service life of impeller and a steady job,

Therefore, there should be corresponding measures in the design, such as the design of unloading groove.

After stable operation, the pressure in the pump at different times is different, which shows that the pressure in the pump changes with time.

In order to facilitate the comparison of the inflow and outflow of oil velocity, the outlet and inlet are designed to be the same width. The velocity of the fluid in the pump is:

Hot oil pump at the entrance and exit velocity of the basic equal, so you can know in the hot oil pump oil is certain, but the speed of the different times of hot oil pump of inward and outward is not the same, through the analysis can know, of inward and outward flow in the pump is a cyclical change, this is the pulsation of the flow, do your child at design time to reduce the pump flow pulsation.

The minimum position of the speed is next to the entrance and exit, and the wall of the pump body. The maximum speed is at the unloading place where the two impellers engage to produce the possible trapped oil area, and the velocity of the impeller's each tooth area is basically equal.

It can be known from the structure that the flow of the hot oil pump has a great relationship with the rotating speed of the impeller, the size of the intertooth area, the number of teeth, etc., so changing the flow rate of the impeller can be changed by changing the rotating speed of the impeller, and changing the number of teeth when the top height is determined.

When other parameters are not changed, the rotating speed of the impeller is transformed. When the rotating speed of the impeller is respectively 350r/min, 390r/min, 460r/min, and 490r/min, different impellers can be obtained and the rotating speed of the oil at the outlet position can be obtained at different rotating speeds. Although the rotating speed of the impeller is different,

The stability of the velocity at the outlet reaches a stable state at 0.015s, but after the stability, the average velocity increases with the increase of the speed. Finally, it is found that the speed of the hot oil pump is proportional to the average velocity of the pump. The faster the speed is, the faster the velocity at the outlet is.

Corresponding hot oil pump displacement is larger, so the need when the variables under the condition of hot oil pump can be implemented by changing the speed of the impeller, but also to pay attention to the speed of the impeller when change the impact of the mesh is too big, too fast lead to impeller impeller speed bottom leads to the leakage of the pump increases, the efficiency of the pump and the corresponding lower,

Therefore, the change of impeller speed needs to be limited within a certain range.

The above is about the introduction of "the radial force of the hot oil pump acting on the impeller circumferential direction is changing"