Energy storage device for hybrid excavator

Abstract

The invention provides an energy storage device for a hybrid excavator. An oil piston is in sealed slide connection with an oil cylinder body and divides the oil cylinder body into two independent cavities B2 and A2; a gas piston is in sealed slide connection with a cylinder block and divides the cylinder block into two independent cavities A1 and B1; the left end of a piston rod penetrates through the right side wall of the cylinder block and is fixedly connected with the right side wall of the gas piston; the right end of the piston rod penetrates through the left side wall of the oil cylinder body and is fixedly connected with the left side wall of the oil piston; the gas piston pressurizes gas in the cavity A1 when moving leftwards, when a movable arm ascends or rotates at constant speed, gas in the cavity A1 produces rightward pressure on the gas piston and pushes the oil piston to move to the right side, an action control device communicates with an energy control device, and theenergy control device communicates with the cavity A2. According to the energy storage device for the hybrid excavator, the gas piston is pushed through energy conversion between hydraulic oil and nitrogen, and energy is saved; the device effectively prevents mutual permeation of oil and gas and prevents nitrogen from permeating into a hydraulic system, and the service life of the device is prolonged.

Description

technical field [0001] The invention relates to an energy storage device for a hybrid excavator, which belongs to the technical field of excavators. Background technique [0002] With the rapid development of social economy, the problem of energy shortage and environmental pollution is becoming more and more serious. All countries have put the reduction of energy consumption and environmental protection on the agenda. Therefore, hybrid excavators will be the main trend of excavator development in the future. [0003] At present, the main factor affecting the rapid development of hybrid excavators is the reliability of energy storage devices. The energy storage devices commonly used on hybrid excavators are piston accumulators, which cannot effectively prevent oil and gas interpenetration due to their structural characteristics. This will cause nitrogen to seep into the hydraulic system, damage hydraulic components, and hydraulic oil to penetrate into the nitrogen storage cha...

AI Technical Summary

Problems solved by technology

[0003] At present, the main factor affecting the rapid development of hybrid excavators is the reliability of energy storage devices. The energy storage devices commonly used on hybrid excavators are piston accumulators, which cannot effectively prevent oil and gas interpenetration due to their structural characteristics. Cause nitrogen to seep into the hydraulic system, damage the hydraulic components, hydraulic oil penetrates into the nitrogen storage cavity, and reduce the fuel-saving efficiency of the system

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