1. Hydraulic foundation:

1、 Two important hydraulic parameters: pressure and flow Q.

Force on unit area Manufacturer of cycloidal hydraulic motor It's pressure. Mpa (international unit), bar (kg/cm2) is the pressure unit

1Mpa=10 pounds (kg/cm2)

The amount of flow per unit time. M3/s, l/min.

Hydraulic (W)=pressure (P)+flow (Q)

One KW=60 × 1Mpa × 1L/min

Equal work: the product of pressure and flow is a constant.

2、 Paska principle.

When the pressure acts on any point of the static liquid, it will transmit in all directions with the same size.

The pressure is a non directional scalar, and the direction of action is perpendicular to the surface of the object.

3、 Decompression.

When the fluid flows in the pipeline, it will be subject to liquid resistance in the opposite direction, Small hydraulic motor Energy consumption is reflected by pressure drop, so it is called pressure loss.

Pressure loss can be divided into frictional pressure loss and local pressure loss. The influence of length on pressure loss is mainly the pressure loss along the way, and the longer the length is, the greater the pressure loss is. The pressure loss caused by the change of flow direction or pipe section is called local pressure loss.

The pressure loss is proportional to the square of the flow rate. In order to reduce the pressure loss, it is necessary to control the velocity of the fluid in the flow channel.

4、 Hydraulic system pressure.

The pressure is related to the hydraulic system load. During the loading time, all the oil discharged from the pump is supplied to the load, and the system pressure is determined by the load; Micro hydraulic motor During the loading time, the oil discharged from the pump supplies the load, and the system pressure is determined by the regulating pressure of the overflow valve.

5、 Hydraulic oil.

Oil pressure is the working medium of hydraulic system. Corrosion resistance, oxidation resistance, good lubricity and good fluidity are the basic requirements of hydraulic oil. The viscosity is too large, the fluidity is poor, the pressure loss is large, the viscosity is too small, and the lubrication performance is poor, Hydraulic motor of snow sweeper The hydraulic components are worn fast, even making the hydraulic valve clamped, which is an important indicator of hydraulic oil. The viscosity of oil varies with temperature, high, low, temperature and viscosity. The hydraulic oil number (viscosity) is the kinematic viscosity at 40 ℃.