FR2791583A1 - Pipe for projecting high-pressure fluid comprises hose with one end attached to cleaning head, and other end attached to external pipe which is link to pipe supplying pressurized fluid - Google Patents

Abstract

Hose (6) has first end (6a) attached to cleaning head (3) through link (7). Second end of hose (6b) is attached to external pipe (8a), which is attached to pipe body (2). External pipe is placed into space (8) attached to pipe body, and has end (8d) of external pipe linked directly, or using additional link, to pipe supplying pressurized fluid.

Description

Lance for spraying fluids under pressure The present invention

  concerns a lance for projection

  fluids in a pressure range from 5 to 200 bar.

  Lances with telescopic bodies are well known in the field of spraying where the jet of the fluid to be sprayed is a jet of low pressure fluid. In this field, telescopic lances are known where the telescopic lance body, provided at one end with a washing head, directly constitutes the conduit through which the pressurized liquid circulates to be ejected by said washing head. Such a design of the lance body requires an embodiment of the lance body in particular materials to obtain a sealed connection between each of the elements of the lance body mounted with sliding interlocking. Such a design therefore only allows work with a single lance length which corresponds to the maximum extension length of the lance body. Furthermore, and because of the materials used to obtain the seal, such a lance cannot be used for the projection of liquids whose pressure is high and by

example of the order of 100 bars.

  2 telescopic lances are also known o the telescopic lance body, provided at one end with a washing head, comprises a flexible conduit external to said conduit and wound in a spiral around the latter to come to be connected to the washing head. Again, such a design is not applicable to the projection of high pressure fluids, on the one hand due to the creation of local overpressures due to the numerous curves of the flexible conduit which create tensions on the lance body and unbalance the latter. , which makes it difficult to manipulate the lance body, on the other hand because, at

  to date, the use of high pressures requires significant rigidity of the conduit that would not allow this spiral arrangement of the conduit. Finally, such an arrangement of the conduit generates numerous pressure drops.

  An object of the present invention is to propose a lance to

  telescopic body allowing the projection of a fluid20 in a large pressure range which can go up to pressures close to 200 bars without risk of leakage.

  Another object of the present invention is to provide a lance whose design allows positioning of the unprotected fittings at the proximal end of the lance body to allow monitoring by the operator and

  reduce the stresses on such fittings.

  Another object of the present invention is to provide a

  lance allowing work at different heights without having to act on the hose connections.

  Another object of the present invention is to propose a lance whose design makes it easier to handle it due to the balance which takes place between the weight of the lance and the pressure of the fluid leaving the lance. 3 To this end, the subject of the invention is a lance for spraying fluids under pressure, preferably under high pressure, in particular for cleaning work, this lance consisting of a telescopic body5 delimiting a longitudinal through duct, a washing head forming a spout fitted to fit at one end of said body and a flexible conduit for supplying cleaning fluid to the washing head, characterized in that the flexible conduit, connected at one end to the 10 washing head, is housed inside the lance body and projects at the so-called proximal end of the lance body, to be connected to one end of a conduit, formed in a part external to said lance body and integral with the latter, said conduit forming a loop at the proximal end of the lance body, the dimension of which is adjusted as a function of the relative nesting position of the elements constituting the co lance rps to allow work at different heights without disconnection of the flexible duct. 20 Thanks to this lance design, the fittings

  sensitive are positioned directly in the vicinity of the proximal end of the body and are due to their attachment to the body relatively little stress 25 so that the risk of leakage is reduced.

  According to a preferred embodiment of the invention, the washing head is a bent rigid pipe connected at one end to the flexible pipe housed in said body 30) lance and provided at its other end with a nozzle for expelling fluid under pressure, the median longitudinal axis of the nozzle duct forming an angle in the range [50 - 50] with the median longitudinal axis of the lance body so as to counterbalance, by means of

  the pressure of the fluid jet leaving the washing head, the weight of the lance body.

  4 Thanks to the design of this washing head, the

  handling of the lance is facilitated.

  The invention will be clearly understood on reading the

  following description of exemplary embodiments, with reference to the single figure which represents a view

  schematic sectional view of a lance according to the invention.

  The lance for spraying pressurized fluid is represented by the general reference 1 in the single figure. This lance 1 is, due to its design, applicable in large pressure ranges and can be used either for spraying or for high pressure cleaning with fluids circulating inside this lance at pressures up to 200 bars . As shown in the single figure, this lance 1 consists of a telescopic body 2 delimiting a longitudinal through conduit, a washing head 3 forming a spout fitted with interlocking at one end of said body 2 and a flexible conduit 6 for the cleaning fluid supply to the washing head 3. Characteristically according to the invention, the flexible conduit 6, which is connected at its end 6A to the washing head 3 by a connector 7, is housed inside the body 2 and protrudes at the so-called proximal end 2C. of the lance body 2, in order to be connected to one end 8C of a conduit 8A formed in a part 8 external to said lance body 2 and integral with the latter by forming a loop at the proximal end 2C of the lance body 2 12, the dimension of which is adjusted as a function of the relative position of interlocking of the elements 2A, 2B constituting the body 2 of lance 1, each relative position of interlocking of the elements constituting of the lance body corresponding to a given length of the body of launch. It is thus possible to

  work at different heights without disconnecting the flexible conduit 6.

  In the example shown, the lance body consists of two elements, generally tubular, 2A, 2B telescopic, that is to say mounted with sliding interlocking. It is obvious that this number of elements could be increased. Furthermore and in a manner known per se, the immobilization in a given or relative nesting position of the elements 2A, 2B constituting the body 2 of the lance is obtained by means of a clamping ring shown at 5 in the figures. Indeed, each clamping ring 5 deforms, during its screwing on 1) the end of an element 2B receiving the other element 2A interlocking, fingers carried by the end of the element 2B of body 2 of lance receiving with sliding interlocking another element 2A of lance body. This deformation of the fingers generates an immobilization of the element 2A inside15 of the fitting assembly. The design of such clamping rings is perfectly known to those versed in this art

  and will therefore not be described in more detail below.

  The washing head 3 is a bent rigid conduit connected) by its end 3B to the flexible conduit 6 housed in the body 2 of the lance. This bent rigid conduit is provided at its other end 3A with a nozzle 4 for expelling pressurized fluid. As shown in the single figure, the median longitudinal axis of the nozzle duct 4 forms with the median longitudinal axis of the lance body 2 an angle a comprised in the range [5 - 50] so as to counterbalance, via of the pressure of the jet of fluid leaving the washing head 3, the weight of the lance body 2 1. In fact, under the effect of the pressure and due to the shape of the washing head 3, the lance tends to straighten while the self weight of the lance encourages him instead to lower. The bent rigid pipe of the washing head 3 comprises, between its end 3B for connection to the flexible pipe 6 housed in the lance body 2 and its bent portion, a straight pipe section of length L at least 6 equal to 30 cm for avoid deflection and / or deformation of the washing head 3 under the effect of pressure. This washing head 3 also has a length Li which fits into the lance body 2 at least 5 equal to 25 cm. It is also preferable, to ensure perfect maintenance of the washing head 3 in the lance body 2, to equip the rigid bent pipe constituting the washing head with reinforcing elements shown in it in the single figure. () As mentioned above, the other end of the hose 6, namely the end 6B, is in turn connected to a conduit 8A external to said body and integral with the body 2 of lance. This conduit 8A is formed in a part shown at 8 in the figures. This part 8 secured to the lance body 2 and providing the conduit 8A arranged to be connected at one end 8C to the hose 6 supplying the washing head 2 is connected, at its other end 8D to conduit 8A,

  directly or via an additional fitting20) to a pipe for the pressurized fluid supply pump. This pump hose has not been shown.

  In the figure, the additional connector is a handle 9 provided with a closable through conduit, this handle being connected at 9A to the supply pump pipe

fluid under pressure.

  In another embodiment not shown, it is also conceivable that the part 8, integral with the lance body 2 and providing the conduit 8A, constitutes directly

  the high pressure handle controlling a flow passage.

  By positioning the part 8 and the handle 9 in the vicinity of the proximal end 2C of the body 2, the operator can at any time check the state of the fittings. Furthermore, the fact that the duct 8 and the part 9 are integral with the lance body 2 limits the stress on the fittings. In the example shown, the part 8 secured to the body 2 of the lance comprises a sleeve 8B extending substantially parallel and contiguously to the conduit 8A of said part 8 to allow, by fitting the proximal end 2C of the body 2 to launches in the sleeve 8B, the securing of the part 85 to the body 2 of the lance 1. This securing is secured by riveting the element 8B to the body 2 of the lance. Thanks to the design of the part 8 and of the handle 9, whether these elements are formed in one piece or by means of two parts, a safe positioning of L is also obtained (the handle 9, this handle being precisely placed in the axis of the washing head so as to obtain for

  operator in the most ergonomic position possible.

  The design of this lance allows working heights close to 8 meters to be reached without the need for a ladder or scaffolding, despite a pressure of around 150 bars. Such a lance is adaptable to all high pressure pumps currently on the market or to be marketed. It should be noted that this lance body 2 is still equipped with an insulating grip handle facilitating handling.

  of the lance body and shown at 10 in the figures. The lance body 2 is generally made of aluminum.

Claims (8)

  1. Lance (1) for spraying pressurized fluid, preferably under high pressure, in particular for cleaning work, this lance (1) consisting of a telescopic body (2) delimiting a longitudinal through conduit, d '' a washing head (3) forming a spout mounted to interlock at one end of said body (2) and of a flexible conduit (6) for supplying cleaning fluid to) the washing head (3), characterized in that the flexible conduit (6), connected at one end (6A) to the washing head (3), is housed inside the body (2) and protrudes at the end (2C) called proximal of the body (2) of lance, to be connected to one end (8C) of a conduit (8A) formed in a part (8) external to said body (2) of lance and integral with the latter, said conduit (6) forming at the proximal end (2C) of the body (2) launches a loop (12) the dimension of which is adjusted as a function of the relative position) ement of elements (2A, 2B) constituting the body (2) of lance (1) to allow work to   different heights without disconnecting the flexible conduit (6).   2. Lance (1) according to claim 1, characterized in that the part (8), integral with the body (2) of lance and providing a conduit (8A) arranged to be connected at one end (8C) to the hose (6 ) supplying the washing head (2), is connected, at its other end (8D) of conduit, directly or by means of an additional connection to a fluid supply pump pipe under pressure.   3. Lance (1) according to claim 2,   characterized in that the additional connector is a handle (9) provided with a closable through conduit.   4. Lance (1) according to one of claims 1 to 3,   9 characterized in that the part (8) integral with the body (2) of lance comprises a sleeve (8B) extending substantially parallel and contiguously to the conduit (8A) of said part (8) to allow, by fitting de5 the proximal end (2C) of the lance body (2) in the sleeve (8B), the attachment of the part (8) to the body (2) of lance (1).   5. Lance (1) according to one of claims 1 to 4,   characterized in that the washing head (3) is a bent rigid conduit connected at one end (3B) to the flexible conduit (6) housed in said lance body (2) and provided at its other end (3A) with a nozzle (4) for expelling pressurized fluid, the median longitudinal axis of the nozzle duct15 forming with the median longitudinal axis of the lance body an angle (a) lying in the range [5 - 50 '] so to counterbalance, by means of the pressure of the jet of fluid at the outlet of the washing head (3), the weight of the body (2) of lance (1) .2) 6. Lance (1) according to claim 5, characterized in that the bent rigid conduit of the washing head (3) comprises, between its end (3B) for connection to the flexible conduit (6) housed in the body (2) lance and its bent portion, a straight pipe section of length (L) at least equal to 30 cm to avoid   bending and / or deformation of the washing head (3) under the effect of pressure.   7. Lance (1) according to one of claims 5 and 6, characterized in that the washing head (3) has a   length (L1) of nesting in the body (2) of lance at least equal to 25 cm.   8. Lance (1) according to one of claims 1 to 7, characterized in that the telescopic lance body is   consisting of interlocking tubular elements, these element I () being, in a relative nesting position, immobilized by deforming clamping rings, during their screwing on the end of the tube receiving the other element with interlocking, fingers carried by the end of the lance body element receiving at   sliding fitting another element of lance body.