WO2004073880A1

WO2004073880A1 - Nozzle to be used at high pressure

Info

Publication number: WO2004073880A1
Application number: PCT/SE2004/000225
Authority: WO
Inventors: Bertil Eliasson
Original assignee: Sinterkil Ab
Priority date: 2003-02-21
Filing date: 2004-02-20
Publication date: 2004-09-02
Also published as: SE0300489D0

Abstract

The present invention relates to a nozzle to be used at high pressure

Description

TITLE

NOZZLE TO BE USED AT HIGH PRESSURE DESCRIPTION

Technical field

The present invention relates to a nozzle to be used at high pressures.

Background og the invention At operations using high pressure media in order to clean , blast or for other purposes , e.g., decontaminate pests using particulate carbon dioxide (reference is hereby made to patent applications SE 9803630-6, SE 0004667-2 and SE 0201060-1, which are hereby incorporated as references) and one thereby uses liquids being transformed into solid particles at the nozzle, gas or mixtures of gases, liquid, and solid particles in different combinations, it is from an availability point of view, important to be able to vary the length of the equipment. In particular when the construction is such that one has a high pressure up to a closing valve or expansion valve in the form of a choke.

It is further of advantage to be able to place the valve controlling the outflow close to the nozzle. This because one, at increasing distances between valve and nozzle losses a certain amount of the medium one wants to let out using a high pressure through the nozzle. At each closure of the valve that amount of medium that exists between valve and nozzle to flow out under gradually decreasing pressure. The corresponding filling under increasing pressure will occur when the valve is opened. If a function by means of which a rapid off and on addition by means of a valve situated at a long distance from the outlet nozzle should be wanted, this cannot be achieved with the slow pressure increments and decreases which follows if the resistance and the volume of the line between valve and nozzle leads to said decrease of pressure. These repeated fillings and emptying/clearing of the line or lines joining the valve with the outlet nozzle means also that the medium to be sprayed out will be consumed in larger quantities than what should have been the case if these periods of lowered pressure could be avoided or be minimized by considerably reducing the distance between the valve and the outlet nozzle.

It is also so that known solutions of obtaining a telescopic extension of equipment intended for use at high pressure means a risk that parts are driven away by the high pressure. The problem occurs in particular e.g., when an ordinarily chosen construction comprising two tubes having different diameters slide against each other, sealed with e.g., O-rings or in any other way.

That force that strives to separate the tubes must be taken out e.g., using a counteracting spring force. This means difficulties from a construction point of view as a varying pressure in the equipment will request different spring force if one should be able to adjust the telescopic tubes to a desired length at the handling without requiring different operations to lock the tubes relative to each other, by means of any device. Springs arranged within the tubes claim space and increase the weight. So will also devices to lock the movement of the tubes relative to each other. Besides a higher weight such devices lead to other drawbacks to the operator, hygienic drawbacks, or many operations which will be required at the handling of the equipment.

If different devices should be arranged onto the outside of the equipment encapsulation of these springs, counter weights etc., will be required as they means a risk that one increases the risk at complex industrial environments, machineries etc., that the equipment will be stuck and will become clumsy to handle. This will also mean increased risks of hurting the operator and/or damaging the equipment.

Other solutions, than those shown below, to obtain an equipment the length of which can be varied, can be obtained. One way of doing this is toi apply a hose on a reel in the vicinity of the handle or otherwise. This, as well as having the hose running in other ways, leads to an insecure function and raises an requirement on the construction of the hose. The hose requirements can not be met simultaneously as the requirement for pressure durability reaching several hundreds Bar cannot be abandoned.

Further, a rolled hose means that contaminants will follow the hose into the reel. This means risks for contaminations when the equipment is moved between environments where high requirements are set with regard to hygiene and where one does not want any contamination of strange compounds.

Further, the outgoing medium should be able to direct in any desired direction to secure a good availability and an efficient operation. This adjustment of the direction of the outlet opening should be continuously variable. It should neither require extra operations to be maintained in a desired position.

Description of the invention The problems referred to above are the basis for the present invention. According to the invention an equipment suitable for the purpose is obtained, which equipment lacks those unsuitable properties that previous device have had in connection with the desired use.

If one allows the connection between the inlet of the equipment and the valve to become a helical tube having a suitable elasticity all the problems mentioned will be eliminated. No forces will strive for separation of the outer tube from the inner one. The helix runs along the outer diameter of the front tube and will thereby leave the central parts of this tube free for the power transmission which makes it possible to turn the valve using the trigger. The construction is completely encapsulated and is thereby protected from damage and contaminations of undesired substances.

Such a helix can be made of e.g., a polymer material, such as PEEK, or another suitable material, such as a metal. Length and diameter can be varied as well.

Further, a valve in the vicinity of the nozzle, which is to be controlled mechanically using a trigger in the rear end of the equipment be controlled in a simple way by means of a rotational movement which is transferred from the trigger through a square tube in which a round bar runs by means of a square bushing, which locks the round bar against rotation relative the square tube. The valve can then be designed in different ways, e.g., such that two hole images are adapted to each other in such a way that the flow through the valve can be varied.

The outflowing medium can be directed in any desired direction to secure a good availability and an efficient operation, by means of the direction of the outlet openings being continuously variable. It requires no extra manual operation to remain in a desired position.

It is preferred having a flexible pliability of the nozzle. This solved by having one or more cannulae running through a flexible tube of polymer or metal. This tube is surrounded by a pliable tube having a suitable surface for easy cleansing. Short description of the drawing

FIG. 1 shows an embodying example of a nozzle according to the invention.

2 denotes a generally cylindrical tube for receiving details of the device according to the invention, whereby 1 denotes a rotaion creating cylindrical body arranged in the rear end of the device, which body 1 transfers a longitudinal movement to a rotational movement of a telescopic barlO connected to a valve 3 of the front end of the device. Immediately in front of the valve 3 there are cannulae 7 arranged to a multiple opening nozzle being part of the nozzle 4 having an outlet opening 14. The cannulae 7 are arranged in a pliable, flexible tube 5. The valve 3 is arranged in the fron end of a telescopic inner tube 8 in which a helical cannula 11 runs which has a connection 12 to the valve 3, which helical cannula 11 runs on the outside of the valve bar 10. In connection to the valve 3 a sliding bushing 9 is arranged.

At the rear end of the tube 2, in a casing 18, there is a handle grip 16 arranged to prevent involuntary pressing in of the trigger 15. In the rear end there will also be a connection nipple 13 for the medium to be distributed under high pressure. In connection to the body 1 a return spring 17 is arranged to return the valve rotation movement, which is achieved at the pressing in of the handle 15 and the transfer to a rotational movement.

The front part of the outer tube 2 can be telescopically arranged top facilitate an extension/prolongation of the tube to improva availability.

List of reference numbers

1. Rotation creating body which transforms a longitudinal movement into a rotation

2. Tube 3. Valve

4. Nozzle

5. Pliabale flexible tube

6. Handle casing

7. Cannulae 8. Inner tube, telescopic

9. Sliding bushing

10. Telescopic transmission of rotational movement to valve

11. Helical tube

12. Joint of helical cannula to valve 13. Medium joint

14. Outlet opening

15. Trigger

16. Security catch

17. Return spring 18. Casing

Claims

1. Nozzle provided with a valve to be used at high pressure, comprising a continuously variable, non-locking telescopic tube comprising an outer tube and connection connecting an inlet and a valve, whereby said connection is a helical elastic tube.

2. Nozzle according to claim 1, comprising the combination of telescop and proplaced valve.

3. Nozzle according to claims 1-2, wherein the helical elastic tube is a cannula.

4. Nozzle according to claims 1-3, wherein a connection between the valve and an outlet opening comprises cannulae.

5. High pressure spraying equipment comprising a valve according any of the aforegoing claims.