Liquid pressure alternating pressure pump and pressure exchanging method thereof

Abstract

The invention discloses a liquid pressure alternating pressure pump which comprises a power cylinder block, a liquid pumping cylinder block, a partition plate, a guide sleeve sealing assembly, a piston rod, a power piston, a liquid pumping piston, a buffer device, a power upper liquid inlet valve, a power lower liquid inlet valve, a power liquid inlet manifold, a power upper drain valve, a power lower drain valve, a power drain manifold, a fluid pumping upper liquid inlet valve, a fluid pumping lower liquid inlet valve, a liquid pumping upper drain valve, a liquid pumping lower drain valve, aliquid pumping drain manifold, a check valve and a cut-off valve; and the power cylinder block and the liquid pumping cylinder block are integrally connected up and down into a whole, the partition plate is arranged between the two cylinder blocks, a guide sleeve sealing assembly is arranged in the center of the partition plate, the lower end of the piston rod is connected with the power piston, the upper end of the piston rod is connected with the liquid pumping piston, the liquid inlet valves and the drain valves are arranged at the upper and lower ends of the two cylinder blocks, and the buffer devices are arranged in the cylinder blocks. The liquid pressure alternating pressure pump is characterized in that the energy exchange method is novel and flexible, and the energy recovery efficiency is high; the application range is wide; and the structure is simple and practical, the power consumption is saved, and the production cost is saved.

Description

technical field [0001] The invention relates to a pressure exchange and variable pressure device of liquid flow, in particular to a liquid pressure alternating pressure pump, and also relates to a pressure exchange method of the liquid pressure alternating pressure pump. Background technique [0002] In the production process of the chemical industry, there will be many pressurization and decompression situations. For example, in the high-pressure washing and absorption process, high-power plunger pumps and high-power multi-stage centrifugal pumps are mainly used for high-pressure liquid transportation, and the return flow from the washing and absorption devices The potential energy of the high-pressure liquid is simply decompressed. In order to reuse the potential energy of the high-pressure liquid returned by the washing device, the current method is to use a multi-stage centrifugal pump to equip a hydraulic turbine device or a turbine power generation device. The device i...

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Problems solved by technology

[0002] In the production process of the chemical industry, there will be many pressurization and decompression situations. For example, in the high-pressure washing and absorption process, high-power plunger pumps and high-power multi-stage centrifugal pumps are mainly used for high-pressure liquid transportation, and the return flow from the washing and absorption devices The potential energy of the high-pressure liquid is simply decompressed. In order to reuse the potential energy of the high-pressure liquid returned by the washing device, the current method is to use a multi-stage centrifugal pump to equip a hydraulic turbine device or a turbine power generation device. The device is an energy-saving device that can partially recover the potential energy of liquid pressure and convert it into kinetic energy. The power jointly drives the multi-stage centrifugal pump to rotate and do work, thereby reducing the power output of the motor and achieving the purpose of saving energy. The advantage of this device is that the structure is simple, but the disadvantage is that the energy recovery efficiency is too low, and the recovery rate is the highest in practical applications. Only 30%, the energy saving effect is not obvious, the turbine power generation device is more complicated than the water conservancy turbine device and the energy recovery rate is low, and the general application is less

In order to overcome the above shortcomings, the inventor previously disclosed a "pressure exchange pump" with patent publication number CN203098431U and a "pressure exchange method for pressure exchange pump" with patent publication number CN104019065A, which can realize direct conversion of high-pressure liquid energy and It can be recycled efficiently, but this technical solution needs to use a low-power motor as supporting power to drive the crankshaft connecting rod, and then connect the crankshaft connecting rod with the piston rod to drive the piston movement in the exchange pump, so the cost input is relatively high ;The crankshaft and connecting rod structure is difficult to realize the large stroke movement of the piston from the volume to the manufacturing cost, which limits the unit recovery of high-pressure liquid energy; if the potential energy recovery is not the same liquid, or the liquid pressure is different, the above technology The program is also incapable of

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