CN-117450059-B - Control valve for liquid-driven three-cylinder reciprocating pump

CN117450059BCN 117450059 BCN117450059 BCN 117450059BCN-117450059-B

Abstract

The invention relates to the field of hydraulic three-cylinder reciprocating pumps, and discloses a control valve for a liquid-driven three-cylinder reciprocating pump, which mainly comprises a valve core, a valve sleeve, a valve body, an end cover and an adjusting cover, wherein a valve port with a certain rule is arranged on the valve core, a groove with a certain rule is arranged on the valve sleeve, the valve core continuously rotates at a constant speed in the valve body, three groups of valve ports with 120-DEG phase difference are adopted for periodically supplying oil to three oil cylinders, the three oil cylinders are controlled to move according to a law of uniform acceleration-uniform speed-uniform deceleration, and the theoretical instantaneous flow of the liquid-driven three-cylinder reciprocating pump is free from pulsation.

Inventors

TAN PING
ZHANG QIANG
ZHANG SHUNPING
TIAN HUAIXIANG
HUO KAIZI
Pang Huangwei
SU AO

Assignees

重庆水泵厂有限责任公司

Dates

Publication Date: 20260508
Application Date: 20231025

Claims (10)

1. The control valve for the hydraulic three-cylinder reciprocating pump is characterized by comprising a cylindrical valve body, a valve sleeve and a shaft rod-shaped valve core, wherein the valve sleeve is fixed in the valve body, and the valve core is rotationally connected in the valve sleeve; the middle part of the valve body is provided with valve body oil inlet holes along the radial direction, six ring grooves are symmetrically distributed on the inner wall of the valve body left and right by taking the axis of the valve body oil inlet holes as the center, each ring groove is internally provided with valve body oil outlet holes communicated with the outside of the valve body, and the six valve body oil outlet holes are symmetrically distributed by taking the axis of the valve body oil inlet holes as the center; the middle part of the valve sleeve is provided with valve sleeve oil inlet holes along the radial direction, the valve sleeve oil inlet holes and the valve body oil inlet holes are coaxially arranged, six groups of valve sleeve oil outlet holes are symmetrically distributed on the valve sleeve left and right by taking the axis of the valve sleeve oil inlet holes as the center, each group of valve sleeve oil outlet holes are correspondingly communicated with one annular groove on the valve body, the phase difference between two adjacent groups of valve sleeve oil outlet holes on one side of the valve sleeve oil inlet holes is 90 degrees, and each group of valve sleeve oil outlet holes comprises two holes symmetrically distributed by taking the valve sleeve axis; The valve core is internally provided with an axial oil duct, the outer wall of the middle part of the valve core is radially provided with an oil inlet ring groove communicated with the oil inlet holes of the valve sleeve, the oil inlet ring groove is provided with valve core oil inlet holes communicated with the oil duct, six groups of valve core oil outlet holes are symmetrically distributed on the valve core left and right by taking the axis of the valve core oil inlet holes as the center, each group of valve core oil outlet holes corresponds to one group of valve sleeve oil outlet holes intermittently communicated with the valve sleeve, the phase difference between two adjacent groups of valve core oil outlet holes on one side of the valve core oil inlet holes is 30 degrees, and each group of valve core oil outlet holes comprises two holes symmetrically distributed by taking the axis of the valve core; sealing structures are arranged at two ends of the valve body, and axial channeling preventing structures are arranged at two ends of the valve core.
2. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 1, wherein the phase difference between the oil outlet holes of adjacent valve bodies on one side of the oil inlet hole of each valve body is 90 degrees.
3. The control valve for a liquid-driven three-cylinder reciprocating pump of claim 1, wherein the valve housing oil outlet is a square hole.
4. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 1, wherein the valve core oil outlet hole is a square hole.
5. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 1, wherein the valve sleeve and the valve body are in interference fit.
6. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 1, wherein the valve core comprises a valve core body and a valve core cover, a long blind hole is formed in the valve core body and used as an oil duct, and the valve core cover is fixedly connected to the end part of the valve core body to seal the long blind hole.
7. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 1, wherein a plurality of valve core oil inlet holes are uniformly formed along the circumferential direction of the valve core.
8. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 1, wherein the sealing structure comprises annular cover plates connected to two ends of the valve body, the annular cover plates are tightly pressed on the outer sides of the end faces of the valve body and the valve sleeve, and sealing rings positioned on two sides of the interface of the valve body and the valve sleeve are arranged on the annular cover plates.
9. The control valve for the liquid-driven three-cylinder reciprocating pump of claim 8, wherein the axial channeling-preventing structure comprises an adjusting cover plate connected to the annular cover plate, the adjusting cover plate is sleeved on the valve core, shaft shoulders are arranged at two ends of the valve core, a thrust bearing sleeved on the valve core is arranged between the shaft shoulders and the adjusting cover plate, and a sealing ring for sealing between the adjusting cover plate and the annular cover plate and between the adjusting cover plate and the valve core is further arranged on the adjusting cover plate.
10. A liquid-driven three-cylinder reciprocating pump is characterized in that a control valve for the liquid-driven three-cylinder reciprocating pump is used as an oil way control piece of three oil cylinders, a valve body oil inlet hole of the control valve is connected with an oil pump outlet, oil outlet holes of each two symmetrically distributed valve bodies are respectively connected with left and right oil ports of one oil cylinder, and a valve core is connected with a driving device capable of driving the valve core to rotate.

Description

Control valve for liquid-driven three-cylinder reciprocating pump Technical Field The invention relates to the field of hydraulic three-cylinder reciprocating pumps, in particular to a control valve for a hydraulic three-cylinder reciprocating pump. Background The reciprocating pump on the market at present takes a crankshaft cross head structure as a main stream, the stroke is limited by the size of a crankshaft, the reciprocating pump is generally smaller, and in order to realize the output of large outflow, the reciprocating times are faster, so that the failure of a hydraulic end inlet and outlet one-way valve is fast and the vibration of a pump group pipeline is large. The high reciprocation times also result in poor suction performance and inability to deliver higher viscosity media. The motion characteristic of the crank block structure determines that the instantaneous flow delivered is pulsating, the flow pulsation limits the application of the crank block structure under the working condition requiring the flow pulsation, and the pump set pipeline can vibrate greatly. Currently, the hydraulic drive reciprocating pump in the market is commonly two-cylinder, three-cylinder and five-cylinder reciprocating pumps, and is mainly used for conveying concrete, paste and the like. The cylinder piston moves back and forth respectively, when the suction and discharge of the cylinders are switched, the instantaneous flow is small, and the flow pulsation at the moment is large. The oil cylinder is only in one movement direction for discharging travel, and the structure size is large when the same flow output is realized. Disclosure of Invention The invention aims to provide a control valve for a liquid-driven three-cylinder reciprocating pump, which is used for solving the problems of small instantaneous flow and large flow pulsation when a plurality of cylinder bodies are switched in suction and discharge of the hydraulic three-cylinder reciprocating pump in the prior art. The control valve for the liquid-driven three-cylinder reciprocating pump comprises a cylindrical valve body, a valve sleeve and a shaft-shaped valve core, wherein the valve sleeve is fixed in the valve body, and the valve core is rotationally connected in the valve sleeve; the middle part of the valve body is provided with valve body oil inlet holes along the radial direction, six ring grooves are symmetrically distributed on the inner wall of the valve body left and right by taking the axis of the valve body oil inlet holes as the center, each ring groove is internally provided with valve body oil outlet holes communicated with the outside of the valve body, and the six valve body oil outlet holes are symmetrically distributed by taking the axis of the valve body oil inlet holes as the center, so that the integral size of the valve body can be reduced; the middle part of the valve sleeve is provided with valve sleeve oil inlet holes along the radial direction, the valve sleeve oil inlet holes and the valve body oil inlet holes are coaxially arranged, six groups of valve sleeve oil outlet holes are symmetrically distributed on the valve sleeve left and right by taking the axis of the valve sleeve oil inlet holes as the center, each group of valve sleeve oil outlet holes are correspondingly communicated with one annular groove on the valve body, the phase difference between two adjacent groups of valve sleeve oil outlet holes on one side of the valve sleeve oil inlet holes is 90 degrees, and each group of valve sleeve oil outlet holes comprises two holes symmetrically distributed by taking the valve sleeve axis; The valve core is internally provided with an axial oil duct, the outer wall of the middle part of the valve core is radially provided with an oil inlet ring groove communicated with the oil inlet holes of the valve sleeve, the oil inlet ring groove is provided with valve core oil inlet holes communicated with the oil duct, six groups of valve core oil outlet holes are symmetrically distributed on the valve core left and right by taking the axis of the valve core oil inlet holes as the center, each group of valve core oil outlet holes corresponds to one group of valve sleeve oil outlet holes intermittently communicated with the valve sleeve, the phase difference between two adjacent groups of valve core oil outlet holes on one side of the valve core oil inlet holes is 30 degrees, and each group of valve core oil outlet holes comprises two holes symmetrically distributed by taking the axis of the valve core; sealing structures are arranged at two ends of the valve body, and axial channeling preventing structures are arranged at two ends of the valve core. Preferably, as an improvement, the phase difference between the oil outlet holes of adjacent valve bodies on one side of the oil inlet hole of the valve body is 90 degrees. Preferably, as a modification, the oil outlet hole of the valve sleeve is a square hole. Preferably, as a modif