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Constant power adjusting system for duplex axial plunger pump and application of constant power adjusting system

A technology for regulating systems and plunger pumps, applied in pump control, liquid variable displacement machinery, machines/engines, etc., can solve the problems of reduced system stability, increased design difficulty and cost of variable mechanisms, etc., to improve service life, Avoid working in an overloaded state, the effect of a high degree of fitting

Active Publication Date: 2015-12-23
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too many springs will increase the design difficulty and cost of the variable mechanism, and the complex structure will lead to a decrease in system stability, which is counterproductive.

Method used

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  • Constant power adjusting system for duplex axial plunger pump and application of constant power adjusting system
  • Constant power adjusting system for duplex axial plunger pump and application of constant power adjusting system
  • Constant power adjusting system for duplex axial plunger pump and application of constant power adjusting system

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Experimental program
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Effect test

Embodiment 1

[0044] This embodiment provides a double-connected axial piston pump constant power regulation system, the constant power regulation system is a constant power regulation system in the regulator on the plunger pump, and its specific structure is as follows image 3 As shown, the main valve body 001 is mainly composed of a spring force compensation mechanism 7 and a hydraulic pressure compensation mechanism 8, wherein the spring force compensation mechanism 7 is composed of an inner spring adjustment screw 701, an inner spring adjustment nut 702, an outer spring adjustment screw 703, Outer spring adjusting nut 704, spring side cover 705, outer spring 706, inner spring converter 707, inner spring 708, outer spring converter 709, spring seat 710 and sealing ring and other accessories constitute. The hydraulic pressure compensation mechanism 8 is composed of compensation rod 801, compensation valve core 802, compensation valve sleeve 803, compensation plug 804, compensation piston ...

Embodiment 2

[0056] This embodiment provides a regulator used on a double-connected axial piston pump, the regulator includes the double-connected axial piston pump constant power adjustment system described in Embodiment 1 (by the spring force compensation mechanism 7, the hydraulic pressure Compensation mechanism 8), a negative flow feedback adjustment system (composed of negative flow feedback cylinder 6) and a set of valve control cylinder position follower system (mainly composed of differential cylinder 5, servo valve 10, feedback rod 11, servo plunger 12 composition). The negative flow feedback oil cylinder 6 is connected with the servo valve 10 in the valve control cylinder position follower system, and is used to control the spool movement of the servo valve 10. The constant power adjustment system communicates with the valve control cylinder through the compensation rod 801 of its hydraulic compensation mechanism 8. The servo valve 10 in the position follower system is connected,...

Embodiment 3

[0058] This embodiment provides a double-connected axial piston pump, the structure of which is as follows figure 2 Shown, it comprises pilot pump 1, main pump (front pump 3 and back pump 2), electromagnetic proportional pressure reducing valve 9, each installs a regulator as described in embodiment 2 on front pump 3 and back pump 2.

[0059] In the actual hydraulic power system, the double-connected axial piston pump is usually connected with the prime mover. In this embodiment, the prime mover is selected as a diesel engine, and the prime mover 4 drives two series-connected plunger through-shaft rear pumps 2 through the input shaft. , the front pump 3 and the pilot pump 1 installed at the rear, wherein the plunger pump provides high-pressure power oil for the working actuators, and the pilot gear pump provides high-pressure oil for the control oil circuit. The front pump 3 and the rear pump 2 are respectively equipped with the regulator 1 and the regulator 2 as described in...

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Abstract

The invention relates to a constant power adjusting system for a duplex axial plunger pump and an application of the constant power adjusting system. The constant power adjusting system comprises a main valve body, an outer spring adjusting screw, an inner spring adjusting screw, an outer spring adjusting nut and an inner spring adjusting nut. The main valve body comprises an outer spring, an inner spring, a compensation rod, a compensation valve element and a compensation piston. A brand-new spring assembling mechanism, namely a series-parallel connection converter (including an inner spring converter and an outer spring converter) is designed at the position of an inner spring and the position of an outer spring of an existing constant power adjusting system, the two springs can show up four sorts of spring stiffness characteristics in the compression process through the series-parallel connection converter, and the fitting degree of the characteristic curve of the four shown comprehensive stiffness coefficients and a theoretical constant power hyperbolic curve is higher in the constant power adjusting process. By the adoption of the mechanism, the energy utilization rate of the plunger pump can be greatly increased when the plunger pump works within the pressure load range of 15-25 MPa; the phenomenon that the plunger pump and a prime mover work in an overload state is effectively avoided, and the service life of hardware is prolonged.

Description

technical field [0001] The invention relates to a double-connected axial piston pump constant power adjustment system and its application, belonging to the technical field of hydraulic transmission components. Background technique [0002] As the main member of the hydraulic power components, the plunger pump is mainly used in the working conditions of high pressure, large flow, and high power; in the hydraulic system applied to construction machinery (such as hydraulic excavators), due to the The required flow rate changes greatly. In order to achieve the purpose of convenient control, energy saving, reduction of fluctuations and coordinated action, more and more multi-connected pumps are selected, among which the double-connected axial piston pump is the most widely used one. [0003] Duplex axial piston pumps are usually used in conjunction with a prime mover (such as a diesel engine). Common brand models in the market today, such as the K3V series piston pumps designed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/22
CPCF04B49/22
Inventor 万丽荣逯振国曾庆良张鑫钟佩思王亮王成龙江守波孟昭胜李伟民许德山王认辉
Owner SHANDONG UNIV OF SCI & TECH
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