Hydraulic transmission system for fracturing truck and fracturing truck

Abstract

The invention discloses a hydraulic transmission system for a fracturing truck and the fracturing truck. The hydraulic transmission system comprises an engine unit, a hydraulic transmission oil path, a fracturing executing mechanism and a hydraulic oil tank. The engine unit comprises at least one engine. The engines are in drive connection with at least one set of hydraulic drive unit. Each hydraulic drive unit comprises an oil pump and a gear pump. The hydraulic transmission oil path comprises a first oil path, a second oil path and a third oil path. The fracturing executing mechanism is provided with a plurality of hydraulic drivers. A closed oil path is formed by the oil pumps, the first oil path, the hydraulic drivers and the second oil path. Air cooling motors are arranged between the second oil path and the third oil path. The input ends of the gear pumps are communicated with the hydraulic oil tank, and the output ends of the gear pumps are collected through the third oil path and then communicated with the second oil path through the air cooling motors. The hydraulic transmission system has the beneficial effects that the oil supply capability is large, the drive capacity is high, the highest output pressure is high, and the maximum output delivery is large; and hydraulic pipelines are simple and easier to arrange, the weight is low, the size is small, using is flexible and convenient, and the oil tank is small in size.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a hydraulic transmission system for a fracturing vehicle and the fracturing vehicle. Background technique [0002] Fracturing is an important technical means for increasing reserves and production in oil and gas fields. It is necessary to use high-pressure fluid to first open formation fractures, and then fill the fractures with fracturing sand to enhance formation permeability and oil and gas production. The traditional fracturing vehicle and its fracturing actuator vehicle all adopt the transmission scheme of "diesel engine-hydraulic torque converter-transmission shaft-fracturing actuator". This arrangement is based on the power scheme of the engine as the prime mover. The main problems are: 1. The transmission route can only be "diesel engine-hydraulic torque converter-transmission shaft-fracturing actuator", which cannot be split; 2. This kind of transmission scheme can o...

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Problems solved by technology

The main problems are: 1. The transmission route can only be "diesel engine-hydraulic torque converter-transmission shaft-fracturing actuator", which cannot be split; 2. This kind of transmission scheme can only choose to meet the maximum power engine, When the single machine exceeds 1500KW, the cost rises rapidly and the selection is difficult; 3. The matching torque converter and other components have a narrow selection range and high price, and important components (torque converter, transfer case, fracturing actuator, etc.) need to be imported , which not only leads to high cost of the whole machine, but also the development is limited by the cycle of imported parts and the supply of goods

In addition, on the basis of the above structure, the diesel engine and fracturing actuators are also replaced by hydraulic transmission instead of mechanical transmission, and hydraulic oil is used to drive the fracturing actuators. However, the disadvantage of this method is that there are many control valve groups. The mass is large, the hydraulic pipeline layout is difficult, and the fracturing actuators of the hydraulic transmission system of the existing fracturing vehicles are all open pumps. Low, the rated speed of open pumps is lower than that of closed pumps, and the output flow of open pumps with the same quantity and displacement is lower, resulting in lower displacement of large pumps

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