This standard specifies the test methods for hydraulic gear pumps. This standard applies to hydraulic gear pumps that use hydraulic oil or other mineral oils with equivalent performance as the working medium. JB/T 7042-1993 Test methods for hydraulic gear pumps JB/T7042-1993 Standard download decompression password: www.bzxz.net
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Machinery Industry Standard of the People's Republic of China JB/T7042-93 Hydraulic gear pump Published on September 23, 1993 Test method Implementation on July 1, 1994 Ministry of Machinery Industry of the People's Republic of China Mechanical Industry Standard of the People's Republic of China Hydraulic gear pump 1 Subject content and scope of application This standard specifies the test method for hydraulic gear pumps. Test method JB/T 7042-93 This standard is not applicable to the test of hydraulic gear pumps with hydraulic oil or other mineral oils of equivalent performance as the working medium. 2 Reference standards GB2346 GB2347 GB3767 GB7935 GB7936 3 Terms and symbols 3.1 Terms Hydraulic and pneumatic graphic symbols Hydraulic and pneumatic systems and components Nominal pressure series Hydraulic tickets and motor nominal displacement series Determination of sound power level of noise source Engineering method and quasi-engineering method General technical conditions for wave pressure components Hydraulic tickets, motor no-load displacement determination method 3.1.1 Rated pressure Continuous operation within the specified speed range and the highest output pressure that can ensure the design life. 3.1.2 No-load pressure Output pressure not exceeding 5% of the rated pressure or 0.5MPa, 3.1.3 Maximum pressure The maximum output pressure allowed for short-term operation. 3.1.4 Nominal speed The highest nominal speed that can guarantee the design life under rated pressure and specified oil inlet conditions. 3.1.5 Minimum speed The minimum speed allowed to maintain a stable output rated pressure. 3.1.6 Displacement The volume of liquid discharged per revolution of the pump shaft. 3.1.7 Nominal displacement The nominal displacement of the product. 3.1.8 No-load displacement The displacement measured at no-load pressure. 3.1.9 Rated operating conditions The operating conditions at rated pressure and nominal speed. 3.2 Symbols and units See Table 1 for symbols and units. Approved by the Ministry of Machinery Industry on September 23, 1993 Implemented on July 1, 1994 Parameter name Delivery sugar content Passenger volume efficiency Total efficiency Vacuum degree Test apparatus and test conditions Test circuit JB/T7042-93 See Appendix A (reference) for the schematic diagram of the test circuit. 4.2 Measurement point location Unit name Liter per minute Liter per revolution Revolution per minute Newton meter Degree Celsius Quadratic meter per secondWww.bzxZ.net 4.2.1 Pressure measurement point: Set at (2~4)d (d is the pipe diameter) from the inlet and outlet of the test pump. During steady-state test, the measurement point can be moved farther away from the test pump, but the pressure loss of the pipeline must be considered. 4.2.2 Temperature measurement point: Set at (2~4)d from the pressure measurement point, farther away from the test pump than the pressure measurement point. Noise measurement point: The location and number of measurement points shall comply with the provisions of Article 6.5 of GB3767. 4.2.3 4.3 Test oil Viscosity: The kinematic viscosity at 40°C is 4274mm*/s (special requirements shall be specified separately). 4.3.2 Moisture: Unless otherwise specified, type tests shall be carried out at 50±2°C; factory tests shall be carried out at 50±4°C. Clearness: The solid particle contamination level code of the test oil shall not be higher than 19/16.4.4 Steady-state condition The steady-state condition is when the variation range of the average displayed value of each parameter meets the requirements of Table 2. Under steady-state conditions, each parameter (pressure, flow, torque, speed, etc.) of each set point shall be measured simultaneously. Table 2 Pressure (gauge pressure p Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.