The method of cleaning the inner surface of blood vessels


(57) Abstract:

Applications: cleaning of tanks, operated in the interest of special equipment. The inventive method is the impact of pulse pressure on the inner surface of the vessel. At the same time as cleanup tool selected working fluid is liquid nitrogen, partially filled in the vessel after irrigation of its inner surface with liquid nitrogen and purging with gaseous nitrogen. After sealing the vessel, the pressure pulse creates inside it by raising the pressure to a predetermined value by evaporation of liquid nitrogen with subsequent release of pressure by the depressurization of the vessel. 1 C.p. f-crystals, 1 Il.

The invention relates to the purification of vessels operating on the objects of special equipment.

It is known device [1], used to clean tanks by dropping from the drive into the product of the air, forming a shock pulse pressure.

The device requires bulky equipment: compressor, filter your environment, the elements of complex automation for the process.

The closest in technical essence to the proposed method is the method [2] cleaning products soba is not enough quality cleaning cavities, great flow of the working fluid (agent), cumbersome equipment, and a large energy installation.

The aim of the invention is to obtain the required purity of the surface, i.e., improving the quality of cleaning of the vessel without removing the vessel from the object. This goal is achieved by the fact that the cleanup tool is selected liquid nitrogen, i.e., itself the working fluid used in the operation of the vessel, and the pressure in the vessel created by evaporation of liquid nitrogen.

Before the rise of pressure in the vessel to produce irrigation of its inner surface with liquid nitrogen. The surface is cooled, the flight of foreign bodies freezes and becomes solid, shrinks and pulls away from the surface of the vessel.

After irrigation produce blowing nitrogen gas. When this air is displaced from the vessel, more evenly cools the inner wall of the vessel. Part of the debris stream of nitrogen gas exhausted outside.

The vessel is partially filled with liquid nitrogen, pressurized. The evaporation of nitrogen and a pressure rise within him. If necessary, liquid nitrogen is heated.

After reaching a certain excess pressure, gaseous nitrogen dropping the ary wave, followed by a stream of nitrogen gas turbulent character.

The operation of pouring liquid nitrogen and discharge pressure of the vessel again, based on the requirements of the quality of cleaning. The vessels are contaminated in the manufacturing process and during operation they need to clean.

Dismantling titanium vessels with the object of special forces is very difficult, often impossible because it may be associated with the destruction of some unique elements. Therefore, the proposed method of cleaning a vessel without removing it from the object is actually the only way of cleaning it. And of operating conditions, namely titanium vessels entering acids into the internal cavity is unacceptable, and hence as they solvents (acids) is invalid.

The quality of cleaning vessels must be such that the foreign body with its inner surface must be no larger than 10-15 microns, such purity is required nitrogen for control systems of exploitation.

In addition, the proposed method is ideal for cleaning the vessels in the manufacturing process after welding works (welding two halves) and further machining of the inner surface, when inside isolate the proposed method.

The vessel 1 has two necks 2 and 3. Through one of them (or both) to produce irrigation internal surface of the vessel 1 with liquid nitrogen, for example, using a spray gun 4, and then produce the blowdown vessel 1 with gaseous nitrogen or evaporated (by gravity) or from an external source by opening the valves 5 and 6. After that fill part of the vessel with liquid nitrogen 7, overlapping the neck 2 and 3 valves 5 and 6. The evaporation of liquid nitrogen 7 and the rise of pressure inside the vessel 1. Control pressure gauge 8. Periodically opening the valve 6, dropping gaseous nitrogen from the vessel 1. Control the quality of cleaning produce according to the output of the filter 9, first opening the valve 10.

As shown by the experimental results, the use of alcohol by spraying them with the inner surface of the vessel 1 at the beginning and end of the treatment process reduces the consumption of liquid nitrogen is 7 and, consequently, reducing the number of cycles refills.

However, the use of alcohol at the facility operation requires additional measures to comply with the rules of fire and explosion safety.

In pilot plant tests were carried out using this method cleaning is substantial titanium vessels, operated on an aircraft is the impact of pulse pressure agent, characterized in that, to improve the quality of cleaning, as the operating agent use liquid nitrogen, before the rise of pressure in the vessel to produce irrigation of its inner surface with liquid nitrogen and venting of gaseous nitrogen, after which the vessel is partially filled with liquid nitrogen and sealed, and the pressure pulse generated by the pressure rise to a predetermined value by evaporation of liquid nitrogen inside the vessel with the subsequent release of pressure, and the amount of nitrogen when filling the cleaned vessel is chosen from the condition for creation of multiple pressure pulses.

2. The method according to p. 1, characterized in that, in order to reduce the number of cycles in liquid nitrogen, use of alcohol, by spraying them with the inner surface at the beginning and end of the treatment process.


Same patents:

FIELD: methods of explosion-proof cleaning of the acting gas-and-oil product pipelines.

SUBSTANCE: the invention is dealt with the methods of explosion-proof cleaning of the acting long distance pipe lines, in particular, gas-and-oil product pipelines and may be can be used also for cleaning of pipelines of other destination. The method ensures prevention of ignition of a mixture of a compressed air with hydrocarbons, detonation of a conflagrant mixture in the event of inevitable its fire and cleaning of a pipeline with large efficiency at significant saving of time, means and materials. The method provides for a mechanical action on a surface subjected to cleaning by a cleaning device with a following flushing by a foaming agent. The cleaning device passing first is realized for the given distance by feeding a mix of a noble gas and a frothing agent, then by a stream of compressed air. The stream in run is divided into equal length sections by separators, which are formed by delivery of batches of a noble gas blended with a frothing agent in a cavity of the pipeline and after the cleaning device exit out of the pipeline the cleaning is going on by feeding batches of a noble gas. The distance between separators is determined with a magnitude less than a pre-detonation distance.

EFFECT: the invention ensures prevention of ignition of mixture of a compressed air with hydrocarbons in a pipeline, detonation of a conflagrant mixtures in the event of inevitable fire, efficient cleaning of a pipeline at significant saving of time, means and materials.

1 dwg

FIELD: mechanical engineering; civil engineering.

SUBSTANCE: invention can be used in designing new types of street and track sweepers, machines for removing chips in shops, ventilation of working places with hazardous atmosphere, etc. According to proposed method, surface under treatment is exposed to remote action of circular gaseous jet directed square to surface. Distance from surface under treatment and beginning of jet is set equal to 2-10-fold thickness of jet at nozzle output.

EFFECT: simplified design, reduced service expenses, enlarged sphere of application.

1 dwg

FIELD: cleaning of oil and gas pipes from asphaltene-resin-paraffin deposits; oil-producing and chemical industries.

SUBSTANCE: proposed method includes pulse action of air flow of deposits moving along pipe. Air flow is formed by pneumatic pulse generator connected to one end of pipe. Air flow is generated at velocity head of from 0.05 to 0.25 Mpa in form of pulse at duration not exceeding 0.1 s.

EFFECT: enhanced efficiency of cleaning; increased productivity.

2 cl, 2 dwg

FIELD: cleaning internal surfaces of heating systems and hot water supply systems of single-storey and multi-storey buildings from solid, mainly silt deposits; cleaning of heating radiators and water supply equipment.

SUBSTANCE: proposed method includes generation of shock waves in system filled preliminarily with water by means of compressed air pulses for breaking deposits and removing them by flow of water. Shock waves are generated by action of vacuum and pulses of compressed air of exponential shape at considerable steepness of leading edge. Pressure of compressed air for generation of shock wave is selected not above rated working pressure in system to be cleaned and water in system is accelerated during action of pulse to velocity causing cavitation effect by portion of air fed to system. Device for realization of this method includes system to be cleaned, pipe lines, hydraulic unit and shut-off fittings. It is additionally provided with receiver and pulse valve which are structurally combined in single unit with commutator connected to it; commutator is so mounted that system to be cleaned may be connected with pulse valve and with drain main.

EFFECT: improved quality of cleaning components of systems; reduced labor input; enhanced safety in servicing equipment.

3 cl, 2 dwg

FIELD: apparatuses for breaking down and loosening caked loose materials in hoppers, possibly in metallurgical, building, mining, food making and other branches of national economy.

SUBSTANCE: apparatus includes accumulation chamber communicated with pneumatic main line for feeding compressed air, exhaust branch pipe and air release mechanism. Apparatus includes in addition unit for increasing pressure in accumulation chamber. Said unit is in the form of three annular flanges arranged along the same axis; upper and lower flanges are provided with rigid bottoms. Elastic diaphragms are fastened between said flanges for restricting together with flange bottoms two chambers. One of said chambers is provided with inlet and outlet non-return valves communicated respectively with pneumatic main line and with accumulation chamber. Second chamber is communicated with pneumatic main line and with atmosphere through control mechanism having valve device and communicated with chamber by flow-through ducts. Said valve device is in the form of freely moving cylinder with rod. Diaphragm of second chamber is provided with pressure member turned to side of diaphragm of first chamber and joined with rod of cylinder of valve device. Surface area of diaphragm of second chamber consists of 1.3 - 3 surface areas of diaphragm of first chamber.

EFFECT: enhanced effectiveness of breaking down and loosening caked materials.

2 dwg

FIELD: heat supply systems.

SUBSTANCE: method comprises supplying pulses of pressurized air and discharging contaminated liquid. The heating apparatus to be cleaned is connected with the air hydraulic pulse unit through flexible hose. The compressed air pulses are generated in the air receiver by means of gradual opening of the valve that is spring-loaded and has varying area of the cross-section. As a result, the expanding air is intensively mixed with water thus removing contaminations from the surface of heating apparatus.

EFFECT: enhanced efficiency and reliability.

3 dwg

FIELD: chemical industry; petrochemical industry; other industries; production of the pneumoimpulse generators used for the pulse action on the gaseous, liquid and solid mediums.

SUBSTANCE: the invention is pertaining to the pneumoimpulse techniques and may be used in the various branches of the national economy for the pulse actions on the gaseous, liquid and solid mediums. The pneumoimpulse generator contains the body with the cavity connected by means of the inlet fitting pipe with the source of the compressed air, and by means of the outlet fitting pipe supplied with the spring-loaded cut-off gate having the rod - with the aerosphere. In the body cavity opposite to the outlet fitting pipe there is the piston, one of the butt wall of which from outer side is spring-loaded concerning the body. The second butt wall is connected to the cut-off gate by means of the rod, which is spring-loaded from its inner side. The pneumoimpulse generator has the heightened power of the pneumoimpulse and the high reliability.

EFFECT: the invention ensures, that the pneumoimpulse generator has the heightened power of the pneumoimpulse and the high reliability.

1 dwg

FIELD: chemical industry; oil-producing industry; other industries; methods and devices for the pipelines cleaning.

SUBSTANCE: the invention is pertaining to the pipeline transportation may be used at cleaning of the interior surfaces of the pipelines from the organic and inorganic settlings, including as well as for cleaning from impurities of the of the technological pipelines, sewer pipes, the shower systems and other interior surfaces of the different engineering structures made out of the metallic and non-metallic materials. The pneumogear is introduced in the pipeline, feed in it the compressed gas under pressure of 40-600 atm., which is passing through the groove in the piston from the inlet chamber into the accumulating chamber, and cyclically at the piston motion the compressed air enters in the pressure dropping holes executed in the body and disposed at the angle of 30-89° concerning the longitudinal axis, of the body towards the inlet chamber. The number of the air discharges from the accumulating chamber makes from 0.2 up to 12 discharges per a second, that ensures the effective cleaning of the pipeline by the pneumopulses at the pneumogear movement in it and increases efficiency of the pneumogear cleaning operation.

EFFECT: the invention ensures the effective cleaning of the pipelines and the increase efficiency of the pneumogear cleaning operation.

6 cl, 1 dwg

FIELD: technological processes.

SUBSTANCE: group of inventions is related to generation of gas phase pulses and may be used in device for cleaning of dust deposits. In method that comprises combustion chamber combined with amplifying flare, combustible gas and oxygen are supplied to prepare mixture into combustion chamber of substantially elongated shape with two opposite ends, mixture is ignited by means of symmetrically installed ignition facilities in ignition zone located near one end of combustion chamber, with provision of initial blasting that results in a pressure wave reflecting from internal walls of combustion chamber end with formation of collision zone, in which initial blasting is at least partially converted into detonation, and pressure pulse is released from combustion chamber and transferred to amplifying flare to create amplified pulse. Besides, wave of mixture combustion is exposed to self-compression due to collision of combustion front in point that is substantially located on central axis of combustion chamber, due to reflection of combustion front from chamber end, where gas and air are supplied, and due to compression of combustion front at the other end of chamber, from which pressure is released into amplifying flare. Device for method realisation comprises combustion chamber of extended shape with two opposite ends, the first of which is arranged with the possibility of combustible gas mixture supply, and the second is made with possibility to release gas pulse generated as a result of gas mixture combustion. Combustion chamber is combined with amplifying flare connected to outlet end of chamber. Chamber also comprises ignition zone located near the first end and equipped with symmetrically installed ignition facilities, and reflection zone created by internal walls of the first end that provides for reflection of gas pressure waves generated as a result of gas mixture ignition. Besides, chamber additionally comprises compression zone located near the second end for compression of gas waves. Method is also presented to cleaning of industrial equipment surfaces having deposits of soot and particles, in which device is used according to invention.

EFFECT: provision of reduced fuel consumption as sound pressure reaches around 160 dB.

9 cl, 2 dwg

FIELD: mechanics.

SUBSTANCE: device for sophisticated intervention into closed cavity comprises a pipe with its first end designed to be introduced into the chamber. The said pipe is additionally connected with appliances intended for reducing pressure inside the cavity and with outlet pipe to withdraw sucked-off material. It is also connected with the pipe coupled with the device designed to abruptly reduce pressure and communicating with the hole to receive the pipe end in contact with atmospheric air, when air pressure inside the cavity reaches the magnitude below certain threshold level. Method of sophisticated intervention into closed cavity, except for surgery intervention, comprises reducing pressure at the pipe end connected with the cavity via the pipe other end, and at pressure inside the cavity below threshold value, and connecting the pipe via pipe and hole with atmospheric pressure to abruptly increase pressure inside the cavity.

EFFECT: simple device and method to be used in various fields, higher quality of cleaning and filling.

13 cl, 6 dwg