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Electrostatic nozzle and controllable jet minimal quantity lubrication grinding system

a technology of lubrication grinding system and controllable jet, which is applied in the direction of liquid supply arrangement, induction-charge spraying, manufacturing tools, etc., can solve the problems of droplet diffusion, uncontrollable movement paths of droplets, polluting the environment, etc., to improve the oleophilic performance of the inner surface, improve the movement resistance of mql liquid, and reduce the disturbance of the jet

Inactive Publication Date: 2020-09-10
QINGDAO TECHNOLOGICAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a new electrostatic nozzle that has tiny bumps on its inner surface to improve its ability to attract oil. This makes it easier for the nozzle to release oil in a controlled and consistent way.

Problems solved by technology

However, movement paths of the droplets are uncontrollable, and problems of droplet diffusion, drift and the like exist.
Droplets drift into the working environment, thereby not only polluting the environment, but also threatening health of operators and reducing an effective utilization rate of the grinding fluid at the same time, and causing waste of resources.
The inventors found that there are few technologies for lubrication with electrostatic atomization in the field of machining in currently published literatures and the technologies are not yet mature.
However, corona discharge has problems of small corona region and poor chargeability, which causes waste of energy while increasing use voltage.
Contact charge (direct contact of a high-voltage power supply with a nozzle) can effectively increase the charge quantity of the lubrication liquid, but has a risk of electricity leakage.
The liquid columns have extremely uneven diameters in such a process, so that the particle size distribution of the subsequently formed small droplets is relatively dispersed, which is not conducive to the controllability of droplet size.
Meanwhile, the small liquid columns at the nozzle outlet severely fluctuate under the action of turbulent flow formed by the compressed air, which is very unfavorable to the control of subsequent conveying routes of the droplets.
Besides the above problems, the inventors also found that noise will be made when the compressed air is sprayed out from the nozzle due to relatively high pressure of the compressed air, and the noise will affect hearing heath of the operators.
In addition, it was found in the grinding system using MQL that a pipeline for conveying nanofluids was often blocked due to strong adsorption performance of nanoparticles, which greatly affects use performance of the grinding system and is also a problem urgent to be solved in the electrostatic atomization MQL system.

Method used

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  • Electrostatic nozzle and controllable jet minimal quantity lubrication grinding system
  • Electrostatic nozzle and controllable jet minimal quantity lubrication grinding system
  • Electrostatic nozzle and controllable jet minimal quantity lubrication grinding system

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0061]As shown in FIGS. 1(a)-1(d), a current injection nozzle structure has a cylindrical nozzle as shown in FIG. 1(a), a conical nozzle as shown in FIG. 1(b), a conical column-shaped nozzle as shown in FIG. 1(c) and a conical column diverging nozzle as shown in FIG. 1(d). The nozzle has relatively high requirements for velocity distribution and turbulence intensity of jet. The design of the nozzle requires that the jet velocity is relatively uniform, a velocity gradient is not easy to be too large, the turbulence intensity of the jet is low, the jet is not easy to have relatively large fluctuations, the concentration distribution of droplets at a nozzle outlet is uniform, and a concentration gradient of the jet is not easy to be too large. According to research experience of relevant workers, under the same inlet and outlet conditions, in velocity distribution, the velocity distribution at an outlet of the cylindrical nozzle is the most uneven, the central velocity distribution is ...

embodiment 2

[0070]As shown in FIGS. 2-4, a two-stage composite micro-texture electrostatic nozzle according to the present embodiment comprises:

[0071]an upper nozzle body 42, a lower nozzle body 43, an insulation sealing ring 44, a nozzle core 45, an annular check ring 46, an MQL liquid conveying pipe interface 47, an air storage chamber 48, spiral air holes 49, a gas-liquid mixing chamber 50, an acceleration chamber 51, a nozzle outlet 52, a high-voltage wire interface 53, a high-voltage wire outlet through hole 54, a check ring placement groove 55, a V2O5 nanofiber sheet 56 and micro-bulges 57.

[0072]The upper nozzle body 42 is connected above the nozzle core through threads; the lower nozzle body 43 is connected below the nozzle core 45 through threads; and the insulation sealing ring 44 is arranged between the upper nozzle body 42 and the lower nozzle body 43 and can effectively prevent gas in the nozzle from leaking. The upper nozzle body 42 and the lower nozzle body 43 are made of insulati...

embodiment 3

[0077]As shown in FIGS. 2-4, a noise-reducing and resistance-increasing electrostatic nozzle according to the present embodiment specifically comprises an upper nozzle body 42, a lower nozzle body 43, an insulation sealing ring 44, a nozzle core 45, an annular check ring 46, an MQL liquid conveying pipe interface 47, an air storage chamber 48, spiral air holes 49, a gas-liquid mixing chamber 50, an acceleration chamber 51, a nozzle outlet 52, a high-voltage wire interface 53, a high-voltage wire outlet through hole 54, a check ring placement groove 55, a V2O5 nanofiber sheet 56 and micro-bulges 57.

[0078]The upper nozzle body 42 is connected above the nozzle core through threads; the lower nozzle body 43 is connected below the nozzle core 45 through threads; and the insulation sealing ring 44 is arranged between the upper nozzle body 42 and the lower nozzle body 43 and can effectively prevent gas in the nozzle from leaking. The upper nozzle body 42 and the lower nozzle body 43 are ma...

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PUM

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Abstract

The present disclosure provides an electrostatic nozzle and a controllable jet minimal quantity lubrication (MQL) grinding system. The electrostatic nozzle comprises a nozzle core; an upper nozzle body is connected above the nozzle core; a free space is formed between the upper nozzle body and the nozzle core for storing compressed air and reducing pressure; a lower nozzle body is connected below the nozzle core; a gas-liquid mixing chamber, an acceleration chamber and a nozzle outlet are sequentially arranged inside the nozzle core from top to bottom; and micro-bulges are uniformly distributed on an inner wall of the acceleration chamber.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Chinese Patent Application No. 201910164150.9 with a filing date of Mar. 5, 2019. The content of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference.TECHNICAL FIELD[0002]The present disclosure belongs to the field of grinding fluid supply devices in machining, and particularly relates to an electrostatic nozzle and a controllable jet minimal quantity lubrication (MQL) grinding system.BACKGROUND OF THE PRESENT INVENTION[0003]Statements in this part merely provide background information related to the present disclosure and do not necessarily constitute the prior art.[0004]Minimal quantity lubrication technology is also called MQL technology, which specifically means that a trace amount of grinding fluid and compressed air with certain pressure are mixed and atomized, and then are sprayed to a grinding region for effectively lubricating chips...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05B5/03B05B5/025B05B5/16
CPCB05B5/0533B05B5/1608B05B5/03B05B5/0255B24B55/02B05B15/65B05B7/0483B05B7/10B05B5/043B05B1/34Y02P70/10
Inventor LI, CHANGHEJIA, DONGZHOUCAO, HUAJUNXU, XUEFENGHAN, ZHIGUANGZHANG, NAIQINGZHAO, HUAYANGYANG, MINZHANG, YANBINWANG, XIAOMINGLI, RUNZEGAO, TENGWU, WENTAOCUI, XINHOU, YALI
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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