CN-122014592-A - High-pressure fluid delivery pump

CN122014592ACN 122014592 ACN122014592 ACN 122014592ACN-122014592-A

Abstract

A high-pressure fluid delivery pump relates to the technical field of fluid delivery equipment and comprises a plurality of machine bodies, wherein each machine body comprises a first end cover, a hydraulic cylinder barrel, a second end cover, a first working cylinder, a third end cover, a second working cylinder and a fourth end cover which are sequentially connected, a piston assembly is arranged in each machine body and comprises a first piston, a second piston and a third piston which are coaxially and alternately arranged, the first piston is in sealing and sliding connection with the hydraulic cylinder barrel, the second piston is in sliding and sealing connection with the first working cylinder, the third piston is in sliding and sealing connection with the second working cylinder, a plurality of reversing valves are in one-to-one correspondence connection with the machine bodies and used for controlling the piston assemblies in the machine bodies to reciprocate, and a timing unit comprises a servo motor, a crankshaft, a plurality of connecting rods and a plurality of sliding blocks and controls the piston assemblies of each machine body to regularly move through the timing unit so as to avoid instant pressure fluctuation of fluid generated by simultaneous reversing of the piston rods of each machine body.

Inventors

QI SHIPENG
XUE ZHIHANG
ZHAO JIWEI

Assignees

青岛创普百斯特装备制造有限公司

Dates

Publication Date: 20260512
Application Date: 20240108

Claims (10)

1. A high pressure fluid transfer pump, comprising: The hydraulic cylinder comprises a plurality of engine bodies, wherein each engine body comprises a first end cover, a hydraulic cylinder barrel, a second end cover, a first working cylinder, a third end cover, a second working cylinder and a fourth end cover which are sequentially connected, a piston assembly is arranged in each engine body, each piston assembly comprises a first piston, a second piston and a third piston which are coaxially and alternately arranged, each first piston is in sealing and sliding connection with the hydraulic cylinder barrel, each second piston is in sliding and sealing connection with the first working cylinder, and each third piston is in sliding and sealing connection with the second working cylinder; The reversing valves are connected with the machine body in a one-to-one correspondence manner and are used for controlling the piston assemblies in the machine body to reciprocate; the device comprises a plurality of frequency converters, a plurality of motors and a plurality of oil pumps, wherein the output ends of the motors are in transmission connection with the oil pumps, the oil inlets of the oil pumps are connected with an oil tank, and the oil outlets of the oil pumps are connected with a reversing valve; The displacement sensors are arranged on the first end cover, and the detection ends of the displacement sensors penetrate through the first end cover and are connected with the piston assembly; the displacement sensor is in signal connection with the control element and is used for sending displacement information of the piston assembly to the control element; The timing unit comprises a servo motor, a crankshaft, a plurality of connecting rods and a plurality of sliding blocks, wherein the crankshaft comprises a plurality of crank necks, the connecting rods and the sliding blocks are in one-to-one correspondence connection, one end of each connecting rod is pivoted with the crank neck, the other end of each connecting rod is pivoted with the sliding block, the sliding blocks are arranged to be capable of horizontally reciprocating, the timing unit also comprises a plurality of sliding rods which are arranged to be capable of horizontally reciprocating, and one end of each sliding rod is provided with a first touching part, and the other end of each sliding rod is provided with a second touching part; The sliding block can contact the first touching part when the sliding block is about to move to a first limit position and push the sliding rod to move towards a first direction for a set distance; The sliding rods are connected with valve cores of the reversing valves in a one-to-one correspondence manner and are used for pushing the reversing valves to reverse; the device also comprises a plurality of timing displacement sensors, wherein the detection ends of the timing displacement sensors are connected with the sliding blocks in a one-to-one correspondence manner, and the timing displacement sensors are used for sending displacement signals of the sliding blocks to the control element; The control element is in signal connection with the displacement sensor and is used for receiving the position information sent by the displacement sensor, the control element is in signal connection with the frequency converter and is used for controlling the starting, stopping and rotating speed of the motor through the frequency converter, the control element is in signal connection with the timing displacement sensor and is in signal connection with the servo motor and is used for controlling the rotating speed of the crankshaft through the servo motor, and the control element is set to control the rotating speed of the servo motor according to the displacement information of one of the sliding blocks detected by the timing displacement sensor so that the position of the sliding block corresponds to the position of the piston assembly in the engine body one by one.
2. The high pressure fluid transfer pump of claim 1, wherein the set distance is the same as a slip distance when a spool of the reversing valve is reversed.
3. The high pressure fluid transfer pump of claim 1, wherein said displacement sensor comprises a magnetic ring mounted to said piston assembly.
4. The high pressure fluid transfer pump of claim 1, wherein said crank necks are equally spaced along said crankshaft axis and are evenly distributed along a circumferential direction.
5. The high pressure fluid transfer pump of claim 1, wherein, The first piston is connected with one end of the second piston through a piston rod, and the other end of the second piston is connected with the third piston through a piston rod.
6. The high-pressure fluid transfer pump according to claim 5, wherein, The inner hole diameter of the first working cylinder is larger than that of the second working cylinder.
7. The high-pressure fluid transfer pump according to claim 6, wherein, The hydraulic system further comprises an inflow pipeline, an intermediate pipeline and an outflow pipeline, wherein the inflow pipeline is connected with the first working cylinder and used for inputting fluid into the first working cylinder, the first working cylinder is connected with the second working cylinder through the intermediate pipeline, and the second working cylinder is connected with the outflow pipeline.
8. The high-pressure fluid transfer pump according to claim 7, A first cavity is formed on one side of the second piston in the first working cylinder, and a second cavity is formed on the other side of the second piston; the device also comprises a first one-way valve and a second one-way valve, wherein an outlet of the first one-way valve is communicated with the first cavity and is used for limiting one-way flow of fluid from the inflow pipeline to the first cavity; an outlet of the second one-way valve is in communication with the second chamber for defining a one-way flow of fluid from the inflow conduit to the second chamber.
9. The high-pressure fluid transfer pump according to claim 7, A third cavity is formed on one side of the third piston in the second working cylinder, and a fourth cavity is formed on the other side of the third piston; the valve further comprises a third one-way valve, a fourth one-way valve, a fifth one-way valve and a sixth one-way valve; The input end of the intermediate pipeline is communicated with the first cavity through a third one-way valve, and the third one-way valve is used for limiting the one-way flow of fluid from the first cavity to the intermediate pipeline; The inflow end of the intermediate pipeline is communicated with the second cavity through a fourth one-way valve, and the fourth one-way valve is used for limiting one-way flow of fluid from the second cavity to the intermediate pipeline; The outflow end of the intermediate pipeline is communicated with the third cavity through a fifth one-way valve, and the fifth one-way valve is used for limiting one-way flow of fluid from the intermediate pipeline to the third cavity; the outflow end of the intermediate pipe is communicated with the fourth cavity through a sixth one-way valve, and the sixth one-way valve is used for limiting one-way flow of fluid from the intermediate pipe to the fourth cavity.
10. The high pressure fluid transfer pump of claim 9, Also comprises a seventh one-way valve and an eighth one-way valve, The inflow end of the outflow pipeline is communicated with the third cavity through a seventh one-way valve, and the seventh one-way valve is used for limiting the one-way flow of fluid from the third cavity to the outflow pipeline; The inflow end of the outflow pipeline is communicated with the fourth cavity through an eighth one-way valve, and the eighth one-way valve is used for limiting one-way flow of fluid from the fourth cavity to the outflow pipeline.

Description

High-pressure fluid delivery pump Technical Field The invention relates to the technical field of fluid conveying equipment, in particular to a high-pressure fluid conveying pump which can be used for pressurizing and conveying high-pressure liquid and compressing and conveying gas. Background The Chinese patent application with publication number CN116335913A discloses a low-pressurization hydraulic piston type hydrogen compressor, which consists of a cylinder, a first hydraulic cylinder, a second hydraulic cylinder, a hydrogen gas inlet and exhaust pipeline, a nitrogen seal and diffusion pipeline system, a hydraulic oil leakage monitoring pipeline system and a hydraulic driving system. The cylinder, the first hydraulic cylinder and the second hydraulic cylinder are horizontally and coaxially arranged, the cylinder is positioned in the middle, and the first hydraulic cylinder and the second hydraulic cylinder are positioned on the left side and the right side of the cylinder. A piston and a piston rod are arranged in the cylinder, the piston in the cylinder divides the cylinder cavity into a left cylinder cavity and a right cylinder cavity, and the left cylinder cavity and the right cylinder cavity are connected with a hydrogen gas inlet pipeline and a hydrogen gas exhaust pipeline. A piston rod in the cylinder penetrates through cylinder covers at two ends of the cylinder to extend into the first hydraulic cylinder and the second hydraulic cylinder, and is fixedly connected with a hydraulic piston in the hydraulic cylinder. In order to realize a working mode with low pressurization and large displacement, the inner diameter of a cylinder is 3-5 times that of a first hydraulic cylinder and a second hydraulic cylinder, and the piston in the middle large-diameter cylinder is pushed to reciprocate at a low speed by the reciprocating motion of the pistons in the small-diameter cylinders at the left side and the right side. However, in the above patent application, the flow rate of the hydrogen compressors is low, and if a plurality of hydrogen compressors are connected in parallel, two hydrogen compressors are simultaneously commutated, which is easy to generate pressure fluctuation problem of the compressed or transported fluid. Disclosure of Invention The invention provides a high-pressure fluid delivery pump aiming at the technical problems in the prior art, wherein a piston assembly of each machine body is controlled to regularly move through a timing unit, so that instantaneous pressure fluctuation of fluid generated by simultaneous reversing of piston rods of the machine bodies is avoided. To achieve the above technical object, an embodiment of the present invention provides a high-pressure fluid transfer pump, including: The hydraulic cylinder comprises a plurality of engine bodies, wherein each engine body comprises a first end cover, a hydraulic cylinder barrel, a second end cover, a first working cylinder, a third end cover, a second working cylinder and a fourth end cover which are sequentially connected, a piston assembly is arranged in each engine body, each piston assembly comprises a first piston, a second piston and a third piston which are coaxially and alternately arranged, each first piston is in sealing and sliding connection with the hydraulic cylinder barrel, each second piston is in sliding and sealing connection with the first working cylinder, and each third piston is in sliding and sealing connection with the second working cylinder; The reversing valves are connected with the machine body in a one-to-one correspondence manner and are used for controlling the piston assemblies in the machine body to reciprocate; the device comprises a plurality of frequency converters, a plurality of motors and a plurality of oil pumps, wherein the output ends of the motors are in transmission connection with the oil pumps, the oil inlets of the oil pumps are connected with an oil tank, and the oil outlets of the oil pumps are connected with a reversing valve; The displacement sensors are arranged on the first end cover, and the detection ends of the displacement sensors penetrate through the first end cover and are connected with the piston assembly; the displacement sensor is in signal connection with the control element and is used for sending displacement information of the piston assembly to the control element; The timing unit comprises a servo motor, a crankshaft, a plurality of connecting rods and a plurality of sliding blocks, wherein the crankshaft comprises a plurality of crank necks, the connecting rods and the sliding blocks are in one-to-one correspondence connection, one end of each connecting rod is pivoted with the crank neck, the other end of each connecting rod is pivoted with the sliding block, the sliding blocks are arranged to be capable of horizontally reciprocating, the timing unit also comprises a plurality of sliding rods which are arranged to be capable of horizontally recip