CN104384122A - Structure for cleaning cavitation device by utilizing hyperventilation cavitating jet - Google Patents

Abstract

The invention provides a structure for cleaning a cavitation device by utilizing hyperventilation cavitating jet. The cavitation device comprises a cavitation device wall surface, wherein a cavitation device chamber is formed in the inner part of the cavitation device wall surface, the cavitation device chamber comprises a cavitation device inner part contraction section, a cavitation device inner part advection section and a cavitation device inner part diffusion section which are sequentially communicated, the end part of the cavitation device inner part diffusion section is positioned at one end of the cavitation device wall surface, a cavitation device spray nozzle inlet is formed in the other end of the cavitation device wall surface, the cavitation device spray nozzle inlet is connected with a pump, a ventilation inlet is formed in the cavitation device wall surface between the cavitation device spray nozzle inlet and the cavitation device inner part contraction section, and the ventilation inlet is communicated with the cavitation device spray nozzle inlet and the cavitation device inner part contraction section. According to the cavitation device provided by the invention, the number of gas nucleus in water can be effectively increased, the collapsing and perishing number of cavitation bubbles can be increased, high pressure which is obtained through collapsing and perishing of the cavitation bubbles is used for cleaning, the pumping pressure needed for cleaning can be effectively reduced, and the energy consumption can be reduced.

Description

Ventilation strengthens cavitation jet cleaning cavitation device structure

Technical field

What the present invention relates to is a kind of cleaning device.

Background technology

World's Development for Cleaning Technique is rapid, and new cleaning method, cleaning technique constantly occurs.It should be noted that especially: from world's cleaning technique patent statistics, Chemical cleaning only accounts for 1/4, and major part is physical cleaning method.In addition, because countries in the world are to environmental protection pay attention to day by day.Also the development of Chemical cleaning is made to be restricted.Such as: the U.S. does not use acidic cleaner, american petroleum chemical enterprise heat transmission equipment cleaning in, except 10% do not need cleaning except, adopt Cleaning by High Pressure Water Jet account for 80%.And adopt Chemical cleaning only account for 5%.In recent years, domestic have many units also using based on the Chemical cleaning of sour agent.Chemical cleaning discharges a large amount of acid, salt severe contamination surrounding enviroment every year, and underground hardness of water is increased.In addition, Chemical cleaning can only be applicable to limited cleaning object.Cleaning by High Pressure Water Jet is the important new technology of in physical cleaning method.Domestic-developed applying high voltage cleaning by high pressure water jet technology, just achieves more successful experience in early 1980s.And be successfully applied to the end cast cleaning strip rolling dephosphorization of boats and ships, station boiler and heat exchanger cleaning mine car knot.The cleaning in the fields such as cleaning Urban Underground blow-off line.Through facts have proved for many years, this technology is that a ripe cleaning technique creates significant economic benefit in national economy.In recent years, the Technolgy of High Pressure Water jet Cleaning is also in more deep, field expansion widely, extension.The aspects such as Cleaning by High Pressure Water Jet rocket engine, cleaning airport runways, cleaning 500,000 volts of supertension lines, cleaning cannon barrel also all achieve certain progress, and table 1 gives the force value of some applicable cases and use.Clean with traditional manual, mechanical system, compared with chemical mode cleans.Cleaning by High Pressure Water Jet tool has the following advantages:

1, select suitable pressure rating, Cleaning by High Pressure Water Jet can not be damaged by cleaning body;

2, the parts after cleaned do not need to carry out cleaning process;

3, shape and baroque parts can be cleaned, can complicated in narrow space and that bad environments is harmful occasion clean;

4, be easy to realize mechanization, modernization is convenient to realize digital program controlled;

5, economize on water, energy-conservation, cleaning performance is good, efficiency is high, cost is low, simultaneously free from environmental pollution.

The developing rapidly and apply of water-jet technology is not only because it is an advanced new technology, and because it is applicable to the every field of national economy, can produce significant economic benefit simultaneously.According to the data of nineteen ninety-five, the annual turnover of U.S.'s water jet industry has reached 1,000,000,000 dollars and has developed the sophisticated industry becoming and have numerous major company rapidly.Britain's water jet turnover in 2000 also reaches 1,000,000,000 dollars.Not only the manufacturer of Water jet equipment has grown up, and large-scale industry cleaning link contractor have also been developed, and all achieves good economic benefit.Teach said " water jet cleaning industry is the industry of billionaire " as international front water jet association president holt mound two.Oil pipeline Conventional cleaning methods be oil pipe is put into acid, alkali lye great Chi boils and boils the cleaning of this method thoroughly oil pipe scrappage is high, energy consumption is high simultaneously, contaminated environment.Working condition is severe.Adopt water jet new technology cleaning tool effective good, efficiency is high, cost is low, do not damage and corrode cleaned material matrix, the advantage such as free from environmental pollution.Serious according to the Zhongyuan Oil Field three factories flow string fouling of recovering the oil of " Zhongyuan Oil Field report " report.All to process more than 1000 ton of pipe every year.After using the high pressure water-jet cleaner of University of Science & Technology, Beijing to carry out cleaning and descaling, come into operation again, saved a large amount of funds.Calculate according to this factory, only this item can be country every year and economizes on the use of funds nearly ten million yuan.The oil pipe of national down-hole has 1,680 ten thousand according to relevant statistics, as wherein there being 5% oil pipe to scrap because of fouling, then and discard pipeline 840,000.Import oil pipe (about 1O root) per ton is worth 8000 yuan, 6000 yuan per ton of domestic oil pipe, and 840,000 oil pipes that the every root price of waste oil tube 250 yuan is so scrapped then lose 2.94 hundred million yuan.If just can be national saving fund 2.94 hundred million yuan by continuing to use only one, oil pipe after these cleaning oil pipe scale removal.

According to Yanshan Petro-Chemical Industry Corporation's statistics, during Beijing Yanshan Petrochemical Company's general overhaul, cleaned the equipment of one of them factory with high pressure water jet, only having used 20 day time to clean heat exchanger, storage tank, reactor and pipeline is that petro-chemical corporation saves fund 1,660,000 yuan.Set up over 3 years according to the statistics cleaning company of water jet cleaning company profile belonging to Baotou Iron and Steel Company and create nearly 4,000,000 yuan of direct economic benefit.Meanwhile, also for unit in charge of construction of institute creates great economic benefit.

Summary of the invention

The ventilation utilizing cavitation bubble to crumble and fall in the narrow regions of material surface to produce high pressure to reach the object of cleaning facility surface attachments and schmutzband is the object of the present invention is to provide to strengthen cavitation jet cleaning cavitation device structure.

The object of the present invention is achieved like this:

The present invention ventilates and strengthens cavitation jet cleaning cavitation device structure, it is characterized in that: comprise cavitation device wall, cavitation device wall inside forms cavitation device chamber, the shape of cavitation device chamber is the cavitation device internal contraction section communicated successively, the inner advection section of cavitation device and cavitation device diffusion inside section, the end of cavitation device diffusion inside section is positioned at one end of cavitation device wall, the other end of cavitation device wall arranges cavitation device nozzle entrance, cavitation device nozzle entrance connects pump, cavitation device wall between cavitation device nozzle entrance and cavitation device internal contraction section arranges vent entrance openings, vent entrance openings is communicated with cavitation device nozzle entrance and cavitation device internal contraction section.

The present invention can also comprise:

1, described pump is horizontal three-plunger reciprocating Pumpp.

Advantage of the present invention is:

1, crumbling and fall the high pressure that reaches for cleaning object by cavitation bubble, effectively can reduce the pump pressure needed for cleaning, reduce energy consumption;

2, compared with cleaning cavitation device with alternate manner, this cavitation device increases passage in cleaning cavitation device front end, effectively improves gas nuclear volume in water, increases the quantity of bubble collapse, realizes increasing cleaning efficiency.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Detailed description of the invention

Below in conjunction with accompanying drawing citing, the present invention is described in more detail:

Composition graphs 1, the present invention includes cavitation device nozzle entrance 1, cavitation device wall 2, vent entrance openings 3, cavitation device internal contraction section 4, the inner advection section 5 of cavitation device, cavitation device diffusion inside section 6, bubble 7 of crumbling and fall, cleaned material body 8.This structure mainly increases passage in cavitation jet cavitation device front end, in water jet, add cavitation nucleus.Realize at nozzle upstream ginseng gas, the cavitating nozzle version increased after ginseng gas system is shown in Fig. 1.Its operation principle is increase the interface connecting air in the upstream of nozzle, and current, through air-breathing cavity, can join gas core content in the method increase water of gas by boundary layer.Will effectively improve cavitation efficiency in the downstream of nozzle like this, thus improve cleaning efficiency.

Horizontal three-plunger reciprocating Pumpp selected by high-pressure pump, if output pressure is 20Mpa, flow is 31.4L/min, and power is 14KW.The surge that can obtain cavitation jet according to the relational expression between solid jet and cavitation jet pressure is according to gas check figure relation, can obtain

p＝(8.6～124)p _s

＝(172～248)Mpa

Nozzle diameter calculates, and according to reciprocating pump and flow optimum Match, can calculate nozzle diameter is

$d=0.69\sqrt{\frac{9}{\mathrm{\μ}\sqrt{p}}}=0.69\sqrt{\frac{31.4}{0.6\sqrt{20}}}=1.85\mathrm{mm}$

Consider that nozzle diameter will reduce 0.1-0.3mm as well, so actual nozzle diameter along stroke pressure loss

d＝＝1.85-0.3≈1.5mm

The speed simplified expression at nozzle place is

$V_t=44.77\sqrt{p}=202.2m/s$

Theoretical jet flow is

$Q_t={2.1d}^2\sqrt{p}=21.13L/\min$

Because theoretical jet is larger than reality, thus rule of thumb and experiment, reality be theory about 0.6 times, so

Q _t＝0.6×21.13＝12.7L/min

According to jet pressure and flow, the power that just can calculate acquisition work is

P＝16.67PQ＝16.67×20×12.7＝4234.2W

Best range is

l＝99.7×(p/100) ^-0.88×d ^0.9＝99.7×(20/100)- ^0.88×1.5 ^0.9

＝592mm

Maximum hitting power is

F＝120×(p/100) ^1.15×d ^1.75＝120×(20/100) ^1.15×1.5 ^1.75

＝38.32N

As can be seen from above-mentioned calculating, come, for cleaning, effectively to lower the pump pressure of cleaning by the crumble and fall high pressure that reaches of cavitation bubble.

The invention process step:

1) water jet by high pressure repeatedly pump conveying arrive cleaning cavitation device front end inlet 1;

2) water jet is when blow vent 3, can join gas core content in the method increase water of gas by boundary layer;

3) water jet having a large amount of gas core at the inner contraction section 4 through different phase of cavitation device, can reach the object improving effluxvelocity;

4) water jet having a large amount of gas core, after speed-raising, flows through the expansion segment 6 of cavitation device, is injected in the body surface 8 needing cleaning subsequently;

5) cavitation bubble 7 is crumbled and fall at body surface 8, forms high speed, the cavitation of high pressure crumbles and fall jet, reaches the object to body surface cleaning.

Claims (2)

1. ventilation strengthens cavitation jet cleaning cavitation device structure, it is characterized in that: comprise cavitation device wall, cavitation device wall inside forms cavitation device chamber, the shape of cavitation device chamber is the cavitation device internal contraction section communicated successively, the inner advection section of cavitation device and cavitation device diffusion inside section, the end of cavitation device diffusion inside section is positioned at one end of cavitation device wall, the other end of cavitation device wall arranges cavitation device nozzle entrance, cavitation device nozzle entrance connects pump, cavitation device wall between cavitation device nozzle entrance and cavitation device internal contraction section arranges vent entrance openings, vent entrance openings is communicated with cavitation device nozzle entrance and cavitation device internal contraction section.

2. ventilation according to claim 1 strengthens cavitation jet cleaning cavitation device structure, it is characterized in that: described pump is horizontal three-plunger reciprocating Pumpp.