US-12618759-B2 - High-pressure liquid delivery system under high centrifugal acceleration condition on arm-centrifuge

US12618759B2US 12618759 B2US12618759 B2US 12618759B2US-12618759-B2

Abstract

A high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge, comprising a centrifuge main engine, a ground liquid source, a ground delivery conduit, a centrifuge bottom rotary joint, a centrifuge rotary arm delivery conduit, a rotary arm-basket pin roll, a basket rotary joint, a basket delivery conduit and a basket conduit outlet. According to the present disclosure, the basket rotary joint is introduced to adapt to the change of the basket-rotary arm angle before and after the arm-type basket centrifuge works, so that the demand for water, electricity, oil and gas transportation of the centrifuge is met. Therefore, the design for the conduit of the centrifuge-basket part is solidified, and compared with the traditional solution that a high-pressure hose is connected to the basket, the centrifugal acceleration load of the load can be increased to more than 500 g.

Inventors

Jinlong Li
Bingjing QIU
Yunmin Chen
Daosheng LING
Jianjing ZHENG
Yubing Wang
Yu Zhao
Chuang ZHAO
Lujun WANG
Jian Wang
Zizhuang YAN

Assignees

ZHEJIANG UNIVERSITY

Dates

Publication Date: 20260505
Application Date: 20240202

Claims (4)

1 . A high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge, comprising a centrifuge main engine, a ground liquid source, a ground delivery conduit, a centrifuge bottom rotary joint, a centrifuge rotary arm delivery conduit, a rotary arm-basket pin roll, a basket rotary joint, a basket delivery conduit and a basket conduit outlet; wherein the centrifuge bottom rotary joint is fixed at a bottom of the centrifuge main engine, and a stator end of the centrifuge bottom rotary joint is connected with the ground liquid source by the ground delivery conduit, so that the centrifuge remains motionless during rotation; a rotor end of the centrifuge bottom rotary joint is connected with one end of the centrifuge rotary arm delivery conduit and rotates with the rotation of the centrifuge during the rotation of the centrifuge; and one other end of the centrifuge rotary arm delivery conduit is connected with the basket rotary joint; wherein the basket rotary joint comprises a stator, a stator input interface, a rotor and a rotor output interface; wherein three arc-shaped launders as one group are uniformly arranged on one circumference of the rotor; a axial annular sealing component is arranged between each group of the launders, and a rounded rectangular sealing component is arranged around the three launders of each group; and a radian of the arc-shaped launder is θ, which can meet the following: 90 ⁢ ° + 360 ⁢ ° ⁢ d π ⁢ D < θ < 120 ⁢ ° - 360 ⁢ ° ⁢ f π ⁢ D where d is an inner diameter of an stator input interface, D is an outer diameter of the rotor, and f is a circumferential safety sealing distance between the launders; wherein the bottom of the each arc-shaped launder is communicated with the rotor output interface; the stator is sleeved outside the rotor; and the stator is provided with the stator input interface in an opening at a position corresponding to the each arc-shaped launder on the rotor; wherein the stator of the basket rotary joint is fixedly connected to the rotary arm-basket pin roll, and the stator remains motionless during the rotation of the basket; and the stator input interface is connected with the centrifuge rotary arm delivery conduit; and wherein the basket delivery conduit is fixed on the basket, and an interface thereof in the basket is the basket conduit outlet; the basket delivery conduit is rigidly connected with the rotor output interface of the basket rotary joint; and the basket delivery conduit drives the rotor of the basket rotary joint to rotate together during the rotation of the basket, and the stator input interface is always communicated with the arc-shaped launder on the corresponding rotor during the rotation of the rotor relative to the stator, thereby communicating with the rotor output interface.
2 . The high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge according to claim 1 , wherein the ground liquid source comprises a hydraulic oil source and a water source.
3 . The high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge according to claim 1 , wherein the ground delivery conduit is connected with the stator end of the centrifuge bottom rotary joint through a sealing threaded port.
4 . The high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge according to claim 1 , wherein the stator and the rotor are fitted by a ball bearing to rotate relatively by 90 degrees.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is a continuation of International Application No. PCT/CN2022/073802, filed on Jan. 25, 2022, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure belongs to the field of geotechnical engineering model tests, and in particular relates to a high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge. BACKGROUND An arm geotechnical centrifuge is a kind of test equipment used for physical simulation test of geotechnical engineering. The arm geotechnical centrifuge simulates self-weight stress via a centrifugal acceleration generated by high-speed rotation, so that a stress field in the scale model of rock and soil carried in a basket is similar to a large-scale prototype on site. Therefore, the arm geotechnical centrifuge can simulate the stress, deformation and damage of the prototype rock and soil structure, so as to verify the design solution, study the material parameters, verify the mathematical model and numerical analysis results, and explore new physical phenomena of geotechnical engineering. The arm geotechnical centrifuge has been widely used in the field of geotechnical engineering. At present, the related experiments involved include piping, dam-break experiment, offshore structure stability experiment, slope instability experiment, deformation and failure of underground cavern and the like. In the experiments involving water such as dam break and piping, it is necessary for the centrifuge to provide water supply to the geotechnical model in the basket. Moreover, as the increase of the depth of the studied rock and soil, in addition to the self-weight stress, it is necessary to apply multi-channel pressures such as axial pressure and confining pressure to the studied rock and soil model through multi-channel hydraulic pressure to simulate the stress state of prototype thereof, and put forward the demand for multi-channel oil supply in the centrifuge basket. The structure of the arm-centrifuge is two baskets hung at the two ends of the horizontal rotating arm perpendicular to the ground. The baskets are perpendicular to the ground/rotary arm before rotary to facilitate loading large-scale experimental devices. However, the baskets are gradually parallel to the ground/rotary arm with the increase of centrifugal acceleration, and the change of the angle brings certain difficulties to the water supply and oil supply in the baskets. In the traditional practice, the water supply and oil supply conduit of the centrifuge is provided with a rigid joint at the end of the rotary arm of the centrifuge connected to a flexible steel wire hose transporting water and oil into the baskets and using the flexibility of the steel wire hose to adapt to the angle difference of the baskets in two states. This hose is referred to “a basket transport hose”. It is difficult to properly reinforce the hose due to the position will change before and during the experiment, and the centrifugal acceleration of the whole hose depends almost entirely on the joint with the rotary arm. However, the existing high-pressure tubing and the matching joint are generally designed for internal pressure resistance, and there is no index and ability of tensile strength. On the centrifuge with a large capacity and a high centrifugal acceleration, the safety of the basket delivery hose and the joint cannot be guaranteed. As the improvement of the capacity of experimental device and the increase of centrifugal acceleration, there is a risk of sealing failure or even fracture due to the basket delivery hose and the joint cannot bear the ultra-high centrifugal load eventually. For example, on the proposed national major scientific and technological infrastructure “Super Gravity Centrifugal Simulation and Experiment Device”, the proposed model machine is configured with a maximum centrifugal acceleration of 300 times of the earth's gravity, an effective rotation radius of 6.4 m, a suspended section length of 2.8 m for the basket delivery hose, and a calculated stress of about 370 kg for a 13 mm inner diameter hose under a normal load. The configuration exceeds the design capacity requirements of the high-pressure hose, so it is urgent to propose a new centrifuge high-pressure liquid delivery solution. SUMMARY The present disclosure aims to provide a high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge in view of the shortcomings of the prior art. The object of the present disclosure is realized through the following technical solution: a high-pressure liquid delivery system under a high centrifugal acceleration condition on an arm-centrifuge includes a centrifuge main engine, a ground liquid source, a ground delivery conduit, a centrifuge bottom rotary joint, a centrifuge rotary arm delivery conduit, a rotary arm-basket pin roll,