Pressure self-adaptive hydraulic reversing system

Abstract

The invention provides a pressure self-adaptive hydraulic reversing system. The pressure self-adaptive hydraulic reversing system is used for piston reserving in a fluid compressing and delivering double-acting compressor and comprises a power drive hydraulic system, wherein the power drive hydraulic system is connected to two hydraulic oil ports formed in the double-acting compressor and used for driving a piston to perform reciprocating motion to form a power drive hydraulic loop, a hydraulic pump and a reversing device are arranged in the power drive hydraulic loop, and the reversing device is correlated with a reversing control device. The reversing control device comprises a pressure detection control device, wherein the pressure detection control device can detect pressure in the power drive hydraulic loop and / or delivery pressure of a fluid compressing delivery pipeline and is correlated with the reversing device so as to achieve the purpose of achieving piston reversing when the pressure of the fluid compressing delivery pipeline and / or the power drive hydraulic system reaches set pressure. The pressure self-adaptive hydraulic reversing system can perform hydraulic reversing according to the pressure of a delivered medium and / or the power drive hydraulic system.

Description

technical field [0001] The invention relates to a reversing system of a hydraulic piston type natural gas compressor, in particular, provides an energy-saving and high-efficiency pressure adaptive hydraulic reversing system of a hydraulic piston type natural gas compressor. Background technique [0002] At present, in the reversing control system of the hydraulic piston type natural gas compressor, the position sensor is generally used to detect the position of the piston in the compression cylinder, so as to judge whether a compression stroke is over, and the signal sent by the position sensor The hydraulic system cycle direction is switched to start the next compression process. [0003] Such as figure 1 It is a schematic diagram of the compression cylinder of the existing hydraulic piston compressor. The compression cylinder 01 is provided with a two-way piston 02, and the hydraulic oil port marked with the arrow "hydraulic oil flow" is connected to the power-driven hydr...

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Problems solved by technology

[0006] One is that if the excessive compression is considered in the design process, a gas decompression device will be installed at the outlet of the compressed natural gas to reduce the pressure exceeding the process requirements. ) → meet the use requirements" method will undoubtedly waste energy;

[0007] The second is that if the above-mentioned excessive compression is not considered in the design, the safety protection system in the gas vehicle inflation system will be activated, and the safety valve and rupture disc will start to release the excessive pressure, which will not only waste electric energy, At the same time, it is also wasting natural gas resources; in addition, if the safety protection system happens to fail, the excessively high air pressure may directly cause the compression cylinder, natural gas vehicle filling equipment, natural gas vehicle gas storage cylinder...the equipment to explode due to overpressure. Bigger security risk

[0008] 2. The sensor is fragile and increases the cost

[0009] like figure 1 As shown, the parts that are most prone to fatigue and wear in the whole system, except for the sealing parts, are the sensors. If it is a mechanical position control part, such as a travel switch, it repeatedly collides with the piston in a high-pressure environment, which greatly shortens the life of the travel switch. Service life; even if you choose a non-contact sensor, such as: electromagnetic induction, photoelectric... sensor, due to the high working pressure, and once the sensor fails, it will collide with the piston... the service life of the sensor will be greatly shortened

[0010] Since most sensor travel switches do not have particularly high mechanical strength, the manufacturing cost of sensors (travel switches) that can withstand a relatively large installation torque (pretightening force) in a high-pressure environment is relatively high.

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