scholarly journals Design and Optimization of Strength type Negative Pressure Suction Force Pluck Port based on Tesla Valve

2021 ◽  
Author(s):  
Zijie Niu ◽  
XU Shengming ◽  
JIANG jiangang ◽  
ZHANG Jun
Keyword(s):  
Negative Pressure ◽  
Simulation Analysis ◽  
Flow Speed ◽  
Air Pressure ◽  
Maximum Pressure ◽  
Structure Parameters ◽  
Strengthening Effect ◽  
Suction Force ◽  
Pressure Suction ◽  
Tesla Valve

Abstract An apple pluck port based on negative pressure suction force can realize contactless apple plucking and also reduce possible damage to the apple. Accordingly, in this study, a strength type pneumatic pluck port was designed on the basis of a Tesla valve. First, a low air pressure block for mechanization of the Tesla valve structure at the intersection between the main and curved air passageway was theoretically modelled and analyzed. Then, the air pressure and the flow speed distribution were analyzed for three different types of structure parameters under various distances of the Tesla pluck port from the apple; on the basis of a fluent simulation, the maximum pressure difference at both sides of the apple was also simulated. Finally, the structure parameters under an optimal negative pressure field according to the simulation analysis were proposed, and a manufactured experimental test was conducted to compare the results with the simulation. The simulation and experimental data prove that when the included angle between the main and curved air passageway of the Tesla pluck port is lower than 45°, the low air pressure block at the intersection between the main and curved air passageway of the Tesla valve affects the flow of the pluck port and extends the length of the low air pressure block. The Tesla pluck port guarantees a flow in the pipe when the pipe port diameter is 10–15 mm larger than the apple diameter, ensuring the negative strengthening effect of the Tesla pluck port. The experiment proves that the Tesla pluck port designed in this study exhibits a better negative pressure strengthening effect than that achieved via previously existing methods, which can strengthen the plucking effect.

Simulation Analysis and Optimization of Lubricating Oil System

2021 ◽  
Author(s):  
Qiongxiao Wu ◽  
Jianjun Wang ◽  
Jingming Chen ◽  
Pengzheng Li
Keyword(s):  
Simulation Model ◽  
Simulation Analysis ◽  
Sudden Change ◽  
Pressure Change ◽  
Lubricating Oil ◽  
Maximum Pressure ◽  
Closing Time ◽  
Original Design ◽  
Relief Valve ◽  
Simulation Results

Abstract Based on the one-dimensional simulation model of lubricating oil system is established and analyzed by using FLOWMASTER software, this paper proposes a new method of optimizing lubricating oil system by PID technology. Ensure that the configuration requirements and control strategies of the relevant accessories of the simulation model are satisfied with the design requirements. Firstly, by simulating lubricating oil pressure fluctuation and lubricating oil flow distribution under Open/Close Valve in different opening and closing time, the optimal opening/closing time of Open/Close Valve is determined to be 0.2 s and 0.5 s respectively. Secondly, by writing the controller script file combined with a controller to realize automatic unloading relief valve simulation, determine the relief valve pressure regulating range of 0∼0.38 MPa, For precision of constant pressure valve of oil spill, the simulation results show that the average 10 m3/h flow caused by pressure changes of about 0.06 MPa. Under the flow sudden change signal of about 40 m3/h, the maximum pressure change is less than 0.1 MPa. Through the simulation results, it is found that most of the lubrication parts in the original design have the phenomenon of flow redundancy, which causes unnecessary pump power loss. The system is optimized by PID technology. By comparing the simulation results before and after optimization, it is found that the speed of constant displacement pump could be changed in time by PID controller, and the flow redundancy could be improved significantly, so the lubricating oil system could be lower consumption and achieve the purpose of optimization.

scholarly journals Lung Injury Resulting from Fluted Silastic Soft Drain Extraction under Negative Pressure Suction*

2013 ◽  
Vol 03 (03) ◽  
pp. 73-75
Author(s):  
Susumu Isoda ◽  
Tamizo Kimura ◽  
Kenji Nishimura ◽  
Nozomu Yamanaka ◽  
Shingo Nakamura ◽  
...  
Keyword(s):  
Lung Injury ◽  
Negative Pressure ◽  
Pressure Suction

DEVELOPMENT OF NEGATIVE PRESSURE SUCTION MECHANISM IN OMNIDIRECTIONAL WALL-CLIMBING ROBOT FOR INSPECTION OF AIRPLANES

2016 ◽  
pp. 106-114 ◽  
Author(s):  
TOMOHIRO YAMAGUCHI ◽  
TAKAFUMI AMAKAWA TETSUHIDE GO ◽  
YASUYUKI YAMADA ◽  
TARO NAKAMURA
Keyword(s):  
Negative Pressure ◽  
Climbing Robot ◽  
Pressure Suction

Numerical simulation of airflow characteristics in the spinning zone at starting time of air-jet spinning machine

2018 ◽  
Vol 89 (12) ◽  
pp. 2342-2352
Author(s):  
Thi Viet Bac Phung ◽  
Akihiro Yoshida ◽  
Yoshiyuki Iemoto ◽  
Hideyuki Uematsu ◽  
Shuichi Tanoue
Keyword(s):  
Fiber Bundle ◽  
High Speed ◽  
Three Dimensional ◽  
Swirl Flow ◽  
Air Pressure ◽  
Suction Force ◽  
Starting Time ◽  
Air Jet ◽  
Spinning Process ◽  
Center Axis

To clarify the formation mechanism of a source of yarn and to discuss the effects of supplied air pressure and exhaust air pressure on the fiber suction force and twist torque at the starting time of the spinning process in an air-jet spinning machine, we simulated, numerically, the three-dimensional airflow pattern without fibers in the spinning zone. Results obtained are as follows: High-speed air jetted through the starting nozzles into the yarn duct in the circumferential direction causes a swirl flow in the yarn duct and a negative pressure region near the center axis of the yarn duct. Hence, air and fibers at the fiber inlet are sucked through the processing duct into the yarn duct. A fiber bundle sucked into the yarn duct rotates, owing to the action of the swirl airflow, and twists the fiber bundle in the processing duct, hence generating a source of yarn. The fiber suction force takes a distribution with a peak against the supplied air pressure and is independent of the exhaust air pressure. The fiber twist torque increases monotonously with supplied air pressure.

EUS-guided fine needle tissue acquisition by using high negative pressure suction for the evaluation of solid masses: a pilot study

2005 ◽  
Vol 62 (5) ◽  
pp. 768-774 ◽  
Author(s):  
Alberto Larghi ◽  
Amy Noffsinger ◽  
Charles E. Dye ◽  
John Hart ◽  
Irving Waxman
Keyword(s):  
Pilot Study ◽  
Negative Pressure ◽  
Fine Needle ◽  
Tissue Acquisition ◽  
Pressure Suction ◽  
High Negative Pressure

scholarly journals Cardiac Arrest after Connecting Negative Pressure to the Subgaleal Drain during Craniotomy Closure

2014 ◽  
Vol 2014 ◽  
pp. 1-3 ◽  
Author(s):  
Monu Yadav ◽  
Sapna A. Nikhar ◽  
Dilip Kumar Kulkarni ◽  
R. Gopinath
Keyword(s):  
Cardiac Arrest ◽  
Negative Pressure ◽  
Surgical Procedure ◽  
Vacuum System ◽  
Suction Drain ◽  
Pressure Application ◽  
Neurosurgical Patients ◽  
One Year ◽  
Pressure Suction ◽  
Subgaleal Space

A one-year-old child operated on for arachnoid cyst in right frontoparietotemporal region had sudden bradycardia followed by cardiac arrest leading to death after connecting negative pressure to the subgaleal drain during craniotomy closure. The surgical procedure was uneventful. It is a common practice to place epidural or subgaleal drains connected to a vacuum system towards the end of craniotomy to prevent accumulation of intracranial and extracranial blood. The phenomenon of bradycardia with hypotension is known to occur following negative pressure application to the epidural, epicranial, or subgaleal space after craniotomy closure. However cardiac arrest as a complication of negative pressure suction drain in neurosurgical patients is not described in the literature.

Numerical Simulation Analysis of Centrifugal Pump Floating Ring Seal

2011 ◽  
Vol 317-319 ◽  
pp. 2148-2151
Author(s):  
Jian Yong Han ◽  
Guo Jing Chen
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Centrifugal Pump ◽  
Simulation Analysis ◽  
Maximum Pressure ◽  
Force Analysis ◽  
Sealing Ring ◽  
Fluent Software ◽  
Ring Seal ◽  
Liquid Flows

According to the studying on the force analysis of floating ring of centrifugal pump, the paper think that floating ring stress will change with the change of centrifugal pump’ s condition. Using fluent software, the floating ring seal was simulated and analyzed. Results show that the liquid force acted on the floating ring is nonuniform and asymmetrical as wedging effect, and that section maximum pressure is not lies in the smallest clearance place, but in the wedge area where liquid flows to the minimum clearance, because the effect of Leak resistance is better in high pressure than low pressure. The leakage decreases and liquid resistance increases with the increases of RPM. The leakage increases with the increases of differential pressure in sealing ring sides and eccentricity. Pressure distribution within the seal clearance is not uniform with the increases of eccentricity.

Structure Design of the ANSYS-Based SLC9-2-Type Direct Reading Current Meter

2014 ◽  
Vol 926-930 ◽  
pp. 1412-1416
Author(s):  
Shi Ming Wang ◽  
Zhen Wang ◽  
Qing Yi He ◽  
Jie Zhang ◽  
Yu Qing Zhang
Keyword(s):  
Water Flow ◽  
Flow Measurement ◽  
Simulation Analysis ◽  
Flow Speed ◽  
Structure Design ◽  
Measurement Instruments ◽  
Ansys Software ◽  
Direct Reading ◽  
Simulation Results ◽  
The Impact

SLC9-2-type direct reading; current meter is a lightweight, reliable, affordable, low consumption of the new flow measurement instruments, available for measuring the different depth of water flow speed and direction in the ocean, bays, rivers, lakes, reservoirs, estuaries . By improving its structure, using the simulation analysis of ANSYS software, it analyzes the new structure on the impact of lowing start. Simulation results for the actual SLC9-2-type direct reading current meter provide guidance for new design.

Sign in / Sign up

Export Citation Format

Share Document