Created on:2021-04-27 10:02

Experimental method of hydraulic gear pump experimental method

Experimental method of hydraulic gear pump experimental method

① Test device

a. The gear pump test shall be equipped with a test bench in accordance with the test circuit shown in Figure e or figure F.

E.jpg

F.jpg

b. Position of pressure measuring point. The pressure measuring point should be set at (2-4) d from the oil inlet and outlet of the tested pump (D is the inner diameter of the pipeline). In the steady-state test, it is allowed to move the measuring point further away from the tested pump, but the pressure loss of the pipeline should be considered.

c. The position of the temperature measuring point. The temperature measurement point should be set (2-4) d away from the pressure measurement point, and further away from the pump than the pressure measurement point.

d. The position of the noise measurement point. The location and number of noise measurement points shall be in accordance with GB / T 17483.

② Test conditions

a. Test medium. The test medium shall be the working medium suitable for the tested pump. Temperature of test medium: unless otherwise specified, type test shall be conducted at (50 ± 2) ℃ and factory test shall be conducted at (50 ± 4) ℃. Viscosity of test medium: the kinematic viscosity at 40 ℃ is 42-74mm2gs (special requirements are specified separately). Pollution degree of test medium: the solid particle pollution level of test system oil shall not be higher than - / 19 / 16 specified in GB / T 14039-2002.

b. Steady state condition. Under the steady-state condition, the variation range of the average display value of the controlled parameter shall comply with the following table. The measured values of the test parameters were recorded under steady-state conditions.

 

Allowable variation range of average display value of controlled parameters of gear pump

Measurement parameters

各测量准确度等级对应的被控参量平均显示值允许变化范围

A

B

C

压力(表压力p<0.2MPa时)/kPa

±1.0

±3.0

±5.0

压力(表压力p<0.2MPa时)/%

±0.5

±1.5

±2.5

流量/%

±0.5

±1.5

±2.5

转矩/%

±0.5

±1.0

±2.0

转速/%

±0.5

±1.0

±2.0

 

c. Measurement accuracy. The measurement accuracy is divided into a, B and C. the type test shall not be lower than B and the factory test shall not be lower than C. The allowable system error of each grade of measurement system shall comply with the provisions of schedule 12.

 

Allowable system error of measurement system

测量参量

测量准确等级

A

B

C

压力(表压力p<0.2MPa时)/kPa

±1.0

±3.0

±5.0

压力(表压力p≥0.2MPa时)/%

±0.5

±1.5

±2.5

流量/%

±0.5

±1.5

±2.5

转矩/%

±0.5

±1.0

±2.0

转速/%

±0.5

±1.0

±2.0

温度/℃

±0.5

±1.0

±2.0

 

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