Patent number: ZL 2024 2 0367990.1 Authorization announcement number: CN 221762700 U

Patent application date: February 28, 2024 Authorization announcement date: September 24, 2024

Mechanical equipment with an oil compensation system is usually equipped with a single plunger compensation pump to compensate for the leakage of lubricating oil. The compensation pump is driven by an eccentric cam on the rotating power spindle, and a check valve is installed at the inlet and outlet of the compensation pump. During each suction stroke of the compensating pump, the compensating pump draws hydraulic oil from the oil tank; During each oil discharge stroke of the compensating pump, the compensating pump replenishes excess hydraulic oil to the system, which can ensure sufficient oil supply for mechanical equipment.

In each oil discharge stroke, excessive hydraulic oil needs to be discharged from the equipment to avoid overpressure. This function is completed by the overflow valve, and excess hydraulic oil flows back into the open oil tank through the overflow valve. The back pressure of an overflow valve usually depends on the pressure of the working medium. The pressure reference port of the overflow valve needs to be connected to the working medium, which is not suitable for some working media that are not allowed to be contaminated. In order to meet this special need, a diaphragm is installed between the isolated working medium and the oil to solve this problem. In view of this, the present invention is proposed.