SE540683C2

SE540683C2 - Hydraulically Driven Motor with a Rotating Output Shaft

Info

Publication number: SE540683C2
Application number: SE1650539A
Authority: SE
Inventors: Rydman Sven
Original assignee: Rydman Husbytorp Ab
Priority date: 2016-04-21
Filing date: 2016-04-21
Publication date: 2018-10-09
Also published as: SE1650539A1

Abstract

The invention relates to a hydraulically driven motor (2) with a rotating forward output shaft (4) for driving a pipe cleaning tool (200) inside a pipe (1), the motor (2) comprising at least one fluid inlet (6), at least one fluid outlet (8, 10, 84, 86), and a hydraulically driven impeller (12), where a fluid flow (v) from fluid inlet (6) to fluid outlet (8, 10) is arranged to force the impeller (12) to rotate together with the forward output shaft (4), where the motor (2) comprises at least two rear arms (16, 18, 88, 90) comprising at least one respective distal support means (20, 22, 92, 94), and means (28) arranged to force the distal support means (20, 22, 92, 94) apart and into abutment with the inner surface (30) of the pipe (1). The invention also relates to a device for cleaning of pipes.

Description

Hydraulically driven motor with a rotating output shaft Technical field The present invention relates to a hydraulically driven motor with a motor body and a rotating forward output shaft for driving a pipe cleaning tool inside a pipe, and to a device comprising a hydraulically driven motor and a pipe cleaning tool according the preamble of claims 1 and 11.

Background When pipes such as water pipes and sewage pipes etc. age, deposits etc. may accumulate on the bottom of the pipe interior, roots may penetrate into the pipe through the pipe wall, etc. A pipe can also be blocked by material such as concrete etc. introduced into the pipe during laying of the same.

One way of removing obstacles from the inside of a pipe is to clean the pipe by inserting a device with a rotating head into the pipe.

DE 2337519 A1 shows a channel cleaning device with a rotating head.

It is also known to use another kind of channel cleaning device having a motor with a rotating output shaft, the channel cleaning device further having a rotating head.

DE 2553940 A1 shows a channel cleaning device having a motor with a rotating output shaft, the channel cleaning device further having a rotating head.

Summary of the invention The problem of driving a pipe cleaning tool inside a pipe is solved by a hydraulically driven motor with a rotating forward output shaft for driving a pipe cleaning tool inside a pipe, and the problem of cleaning a pipe is solved by a device comprising a hydraulically driven motor and a pipe cleaning tool according to the characterizing portion of claims 1 and 11.

By that the hydraulically driven motor with a motor body and a rotating forward output shaft for driving a pipe cleaning tool inside a pipe comprises at least two rear arms comprising at least one respective distal support means where the rear arms extend in a backward direction from and are pivotally connected to a rear part of the motor body, the motor further comprising means arranged to force the distal support means apart and into abutment with the inner surface of the pipe, thus positioning the rear part of the motor radially in the pipe, is obtained the advantage of that the rear part of the motor is positioned radially in the pipe and is at the same time supported against the inner wall of the pipe via the pivotally connected rear arms, thus decreasing the risk for rotation of the motor in the pipe if the rotating pipe cleaning tool comes into contact with material which is difficult to remove.

By that a device for cleaning of pipes comprises a hydraulically driven motor and further comprises a pipe cleaning tool connected to the forward output shaft of the motor, is obtained the advantage of that the rear part of the motor is positioned radially in the pipe and is at the same time supported against the inner wall of the pipe via the pivotally connected rear arms, thus decreasing the risk for rotation of the motor in the pipe if the rotating pipe cleaning tool comes into contact with material which is difficult to remove.

According to one embodiment of the invention, the means arranged to force the distal support means apart comprise at least two fluid outlets and therefrom discharged fluid flows where the fluid flow discharged from the respective fluid outlet is arranged to force the distal end of the respective rear arm towards the inner surface of the pipe. Thus is obtained the advantage of that the fluid driving the pipe cleaning tool can also be used to position the rear part of the motor radially in the pipe.

According to a further embodiment fluid outlets in the means arranged to force the distal support means apart are connected to an upstreams arranged pressure chamber for equalisation of fluid outlet pressures in the fluid outlets. Thus is obtained the advantage of that the the rear part of the motor is centered radially in the pipe.

According to a further embodiment respective distal support means are integrated in the respective arm. Thus is obtained the advantage of that no separate support means are required.

According to a further embodiment the respective distal support means are of wheel type and are arranged rotatably connected to the respective rear arm. Thus is obtained the advantage of decreased friction between the motor and the inside of the pipe.

According to a further embodiment the respective distal support means have sharp edges. Thus is obtained the advantage of increased resistance against rotation of the motor in the pipe.

According to a further embodiment the impeller is a radial impeller, the impeller cavity comprises at least one impeller cavity fluid inlet arranged at the side of the impeller cavity and at least one respective impeller cavity fluid outlet angularly displaced in the direction of impeller rotation from the respective impeller cavity fluid inlet by an angle of rotation enabling at least one impeller wing to be positioned between an impeller cavity fluid inlet and a respective impeller cavity fluid outlet at all possible impeller rotational angles. Thus is obtained the advantage of minimising the amount of fluid flow that does not contribute to the rotation of the impeller.

According to a further embodiment the impeller comprises impeller wings with substantially radially arranged trailing sides and at an acute angle thereto connected leading sides. Thus is obtained the advantage of a way for the fluid entering the impeller cavity to power the impeller.

According to a further embodiment the motor comprises at least one forward cooling fluid outlet arranged connected to at least one fluid inlet for cooling of a rotating pipe cleaning tool by fluid. Thus is obtained the advantage of decreasing the risk of overheating of the pipe cleaning tool.

According to a further embodiment the respective arm and/or distal support means is removably mounted for adaptation of the hydraulically driven motor to various pipe inner diameters. Thus is obtained the advantage of decreasing the number of motor sizes required for pipes of different inner diameters.

According to a further embodiment the hydraulically driven motor comprises a removable arm for positioning of the motor in the pipe before starting of the motor. Thus is obtained the advantage of being able to position a motor when the pipe opens to a cramped space difficult to access.

According to a further embodiment of the the device for cleaning of pipes, the forward end of the motor is arranged to be radially positioned in the pipe by the pipe cleaning tool. Thus is obtained the advantage of that no additional forward radial positioning means are required.

According to a further embodiment of the the device for cleaning of pipes, the forward end of the motor is arranged to be radially positioned in the pipe by at least two on the motor arranged forward support means. Thus is obtained the advantage of an optional way of positioning the forward part of the device radially in the pipe.

Brief description of drawings The invention will be decribed more in detail referring to the attached drawings, where: Figure 1 shows schematically a partial cross section of a pipe and a hydraulically driven motor with a rotating output shaft, seen from the side, Figure 2 shows schematically a side view of a hydraulically driven motor, Figure 3 shows schematically a partial cross section of a hydraulically driven motor according to Figure 1 seen from the front, and Figures 4-6 shows a further embodiment of a motor with four rear arms having a respective distal support means.

Description of preferred embodiments Figure 1 shows schematically a partial cross section of a pipe 1 and a hydraulically driven motor 2 with a motor body 3 and a rotating forward output shaft 4 for driving a pipe cleaning tool 200 inside a pipe 1 according to a first embodiment of the invention, seen from the side. The rotating pipe cleaning tool 200 is here shown in dashed lines as the motor 2 can be connected to various types of pipe cleaning tools 200. Some types of pipe cleaning tools are tools with a combination of radially moving cleaning parts and fixed cleaning parts such as shown in e.g. WO 2014/098754 Al, other types are tools with fixed but possibly flexible cleaning parts of e.g. the steel brush type, still further tools are of a type with moving cleaning parts only. The hydraulically driven motor 2 comprises at least one fluid inlet 6, at least one fluid outlet 8, 10, and a hydraulically driven impeller 12 arranged in an impeller cavity 14 in the motor 2, where a fluid flow v from the at least one fluid inlet 6 via the impeller cavity 14 to the at least one fluid outlet 8, 10 is arranged to force the impeller 12 to rotate together with the thereto connected forward output shaft 4 on which the pipe cleaning tool 200 is arranged to be mounted, e.g. using a bayonet type or other type of coupling. The rotation movement of the impeller 12 and the forward output shaft 4 can be locked to each other using e.g. splines and grooves.

The hydraulically driven motor 2 further comprises at least two rear arms 16, 18 comprising at least one respective distal support means 20, 22, which rear arms 16, 18 extend in a backward direction from and are pivotally connected to a rear part of the motor body 3, preferably at the respective proximal ends 24, 26, of the rear arms 16, 18, the motor 2 further comprising means 28 arranged to force the distal support means 20, 22 apart and into abutment with the inner surface 30 of the pipe 1, thus positioning the rear part R of the motor 2 radially r in the pipe 1.

The hydraulically driven impeller 12 and the impeller cavity 14 and a part of the forward output shaft 4 are preferably arranged in the motor body 3 of the motor 2, e.g. in a motor housing, and the at least one fluid inlet 6 and the at least one fluid outlet 8, 10 are preferably arranged in the motor body 3 of the motor 2 or a therewith connected part of the motor 2.

According to the embodiment shown in Figure 1, the means 28 arranged to force the distal support means 20, 22 apart comprise at least two fluid outlets 8, 10 and therefrom discharged fluid flows 32, 34 where the fluid flow 32, 34 discharged from the respective fluid outlet 8, 10 is arranged to force the distal end of the respective rear arm, 16, 18, towards the inner surface 30 of the pipe 1, e.g. by that the respective fluid flow 32, 34 is arranged to come into contact with the inner side of the respective arm 16, 18 thus forcing it outwards in the radial direction r.

The means 28 arranged to force the distal support means 20, 22 apart may optionally comprise a single fluid outlet 8 directing a respective fluid flow towards at least two rear arms 16, 18 using a e.g. a dual nozzle (not shown).

According to the embodiment shown in Figure 1, the respective distal support means 20, 22 is of wheel type and are arranged rotatably connected to the respective rear arm 16, 18 as can be seen in Figure 1.

In this embodiment, high pressurized fluid f is used when cleaning the pipe 1 by that fluid f is fed to the motor 2 from a pump 36, preferably located outside the pipe 1, via a high pressure hose 38 in order to drive the forward output shaft 4 on which the pipe cleaning tool 200 is arranged to be mounted, whereafter the fluid f is ejected from the motor 2 via at least one fluid outlet 8, 10 towards a respective arm 16, 18 and into the inner cavity of the pipe 1.

The pressure of the fluid f discharged from the at least one fluid outlet 8, 10 can be very high, e.g. be about 200 bar. This has the further advantage of that the discharged fluid f, when discharged backwards bwd in the pipe 1 from the motor 2 as shown in the figure, simultaneously is able to force the motor 2 in the forward direction fwd within the pipe 1. The fluid thus drives both the rotation of the pipe cleaning tool 200 and the forward movement of the motor 2 and the pipe cleaning tool 200 in the pipe 1.

The hose can be more than 100 meters long and attached to a jetting truck (not shown) having a large fluid tank 38, e.g. for holding about 12m<3>of fluid, and a pump 36.

The impeller 12 is preferably a radial impeller, and also preferably the impeller cavity 14 comprises at least one impeller cavity fluid inlet 40, 42 arranged at the side of the impeller cavity 14 and at least one respective impeller cavity fluid outlet 44, 46 angularly displaced in the direction of impeller rotation from the respective impeller cavity fluid inlet 40, 42 by an angle of rotation enabling at least one impeller wing 50, 52 to be positioned between an impeller cavity fluid inlet 40, 42 and a respective impeller cavity fluid outlet 44, 46 at all possible impeller rotational angles.

As mentioned above, the fluid pressure in the motor 2 can be very high. Thus, the forward output shaft 4 is preferably suspended by at least two bearings 54, 56 arranged in the motor 2, preferably one on each side of the impeller 12.

According to the embodiment shown in Figure 1, the impeller 12 is a radial impeller. In order to minimise the radial forces on the forward outlet shaft 4, at least two impeller cavity fluid inlets 40, 42 are arranged at substantially opposing sides of the impeller cavity 14. It is also possible to arrange more than two impeller cavity fluid inlets 40, 42 equally distributed along the periphery of the impeller cavity 14. The fluid flows from the respective impeller cavity fluid inlets 40, 42 thus centering the forward output shaft 4 in the bearings 54, 56. The respective impeller cavity fluid outlets 44, 46 are preferably angularly displaced in the direction of impeller rotation from the respective impeller cavity fluid inlets 40, 42 by an angle of rotation enabling at least one impeller wing to be positioned between an impeller cavity fluid inlet 40, 42 and a respective impeller cavity fluid outlet 44, 46 at all possible impeller rotational angles. The respective impeller cavity fluid inlets 40, 42 and the respective impeller cavity fluid outlets 44, 46 are preferably arranged in the side wall of the impeller cavity 14.

In order to receive substantially the same amount of fluid flow 32, 34 on the respective arm 16, 18 from the respective fluid outlet 8, 10, the at least two fluid outlets 8, 10 are connected to an upstreams arranged pressure chamber 58 for equalisation of fluid outlet pressures in the fluid outlets 8, 10, thus radially r positioning the rear part R of the motor 2 substantially at the center axis X of the pipe 1, i.e. centering the rear part R of the motor 2 in within the pipe 1. By adapting the size and shape of the pressure chamber 58, and further the number, shape and size of the fluid outlets 8, 10, and by mounting possible nozzles in them in order to define the shape, direction and force of the respective fluid flow 32, 34, it is possible to also set both the rotational speed of the forward output shaft 4, to e.g. 5000-6000 rpm, and the size of the reaction force from the fluid outlets 8, 10 driving the motor forward fwd along the pipe 1.

Figure 2 shows schematically a side view of a hydraulically driven motor 2. The motor shown in figure 2 differs from the one shown in Figure 1 in that the at least one fluid outlet 8 is connected to a hose 60 which preferably conveys the fluid discharged from the motor 2 all the way out of the pipe 1 (the pipe 1 shown in cross section). A further difference is how the means 28 arranged to force the distal support means 20, 22 apart are realised.

This motor is especially preferred in situations where it would be a problem to let out fluid into the environment as the pump 36 can feed a large volume of fluid into the motor 2, e.g. about 12 m<3>in about 40 minutes if a jetting truck is used, in operation which fluid also leaves the motor 2. For example, if the open rear pipe end 61 is placed in a building, e.g. in a cellar below ground level, the fluid leaving the motor 2 could flood the cellar if the fluid is not led or pumped out from the building altogether.

According to the motor shown in Figure 2, this problem of possible flooding is solved by connecting both the hose 38 for the fluid entering the motor 2 and the hose 60 for fluid leaving the motor 2 to the pump 36 thereby creating a substantially closed loop for the main part of the fluid. This has the further advantage that the cleaning of the pipe 1 does not have to be interrupted due to lack of fluid f if a jetting truck with a tank containing a limited amount of fluid f is used.

It is to be noted that if a motor 2 according to the one shown in Figure 2 is used, no fluid will be available for neither forcing the distal support means 20, 22 apart nor to force the motor 2 in the forward direction fwd in the pipe 1 as in the Figure 1 embodiment. This is solved by the motor in Figure 2 in that the means 28 arranged to force the distal support means 20, 22 apart and into abutment with the inner surface 30 of the pipe 1 comprise springs 62, 64 arranged to force apart the distal ends of the respective rear arms 16, 18. The force the motor 2 in the forward direction fwd in the pipe 1 can e.g. be solved by a device feeding the respective hose 38, 60 into the pipe 1 thereby also pushing the motor 2 along the pipe 1 with the hoses 38, 60.

When the pipe cleaning tool 200 during rotation abuts against the inner surface 30 of the pipe 1 and/or against some solid material located within in the pipe, the friction therebetween heats up the tool 200. In order to cool the pipe cleaning tool 200 during operation of the motor 2, the motor 2 can further comprise at least one forward cooling fluid outlet 66, 68 arranged connected to at least one fluid inlet 6 in order to be able to cool the rotating pipe cleaning tool 200 by fluid ejected from the at least one forward cooling fluid outlet 66, 68 towards the cleaning tool 200. The amount of fluid discharged by the at least one forward cooling fluid outlet 66, 68 is much smaller than that from the at least one fluid outlet 8, and will thus not lead to the above mentioned flooding problems even if the open end 61 of the pipe 1 is located in e.g. a cellar.

In the motor shown in Figure 2, the respective distal support means 20, 22 are integrated in the respective arm 16, 18, preferably the distal end of the distal part of the respective arm 16, 18 form the respective distal support means 20, 22. Here, the distal ends of the rear arms 16, 18 are thus arranged to slide along the inner surface 30 of the pipe 1. It is also possible to attach wheel type distal support means - see the embodiment shown in Figure 1 - or other types of distal support means such as runners (not shown) to the rear arms 16, 18. Similarly, the distal support means shown in the Figure 2 motor can replace the wheels in the Figure 1 embodiment.

Distal support means 20, 22 of rotating wheel type are preferred as this decreases the friction between the distal support means 20, 22 and the inner wall 30 of the pipe 1, thus facilitating easier forward fwd and backward bwd movement of the motor 2 within the pipe 1. The wheel type distal support means preferably have a substantially circular outer periphery, which optionally can be serrated. The outer periphery of the wheels may further be sharpened to form a sharp edge in order for the wheels to be somewhat forced into the inner surface 30 of the pipe 1, thus further increasing the resistance against rotation of the motor 2 in case the rotation of the pipe cleaning tool 200 is slowed down by solid material inside the pipe.

The respective arm 16, 18 and/or distal support means 20, 22 is preferably removably mounted for adaption of the hydraulically driven motor 2 to various pipe inner diameters D, e.g. by replacing the arm 16, 18 with one of different length or by replacing the distal support means 20, 22 e.g. a wheel, with one of different diameter.

Figure 3 shows schematically a partial cross section of a hydraulically driven motor 2 seen from the front according to the embodiment shown in Figure 1. As can be seen in Figure 3, the impeller 12 comprises impeller wings 50, 52 with substantially radially r arranged trailing sides 70 and at an acute angle thereto connected leading sides 72. The shapes of the wings can be adjusted.

The respective impeller fluid cavity inlet 40, 42 is preferably arranged to direct fluid into the impeller cavity 14 angularly displaced from the radial direction r and preferably close to the direction of rotation of the impeller 12 thus enabling the incoming fluid to hit the trailing side 70 of the respective impeller wing 50, 52. Further, the respective impeller fluid cavity outlet 44, 46 is preferably arranged to direct fluid out from the impeller cavity 14 angularly displaced from the radial direction r and preferably close to the direction of rotation ? of the impeller 12.

The respective impeller cavity fluid outlets 44, 46 are preferably angularly displaced in the direction of impeller rotation from the respective impeller cavity fluid inlets 40, 42 by an angle ?,? of rotation enabling at least one impeller wing 50, 52 to be positioned between an impeller cavity fluid inlet 40, 42 and a respective impeller cavity fluid outlet 44, 46 at all possible impeller rotational angles.

Figures 4-6 show schematically a further embodiment of a hydraulically driven motor 2 with a motor body 3 and a rotating forward output shaft 4, which motor 2 according to this embodiment comprises a removable arm 74 for positioning of the motor 2 in the pipe before starting of the motor 2 in case the open end of the pipe opens into a small narrow space. The arm 74 is thus connected to the motor 2, whereafter the pipe cleaning tool (not shown) together with the front part F of the motor 2 is inserted into the pipe via the open pipe end using the arm 74. When the motor 2 together with the pipe cleaning tool (not shown) is positioned in the pipe, the removable arm 74 is removed from the motor 2. Thereafter, the motor 2 is pushed forward all the way into the pipe. The arm 74 can have a threaded end 75 which in use is connected to a threaded hole 77 in the motor 2. Possible forward cooling fluid outlets 66, 68 are also shown.

In order to be able to retract the motor 2 and the pipe cleaning tool from the pipe in case of a hose gets separated from the motor 2 during operation, a mount 76 can be arranged at the rearmost part of the motor body 3. A wire 78 can then be attached between the mount 76 and a point on the hose at some distance from the motor 2. In case the hose somehow is disconnected from the motor 2 when the motor 2 is in the pipe, it is possible to pull out the motor 2 from the pipe by pulling on the hose.

The figures 4-6 show embodiments of a motor with four rear arms 16, 18, 88, 90 having a respective distal support means 20, 22, 92, 94. To achieve a stabile yet economical positioning of the rear part R of the motor in the pipe, preferably three or four rear arms are arranged equally spaced along the periphery of the motor 2. As mentioned above at least two rear arms are required. More than four rear arms are also possible but not necessary.

The motor body may comprise detachable rear and front end plates 96, 98 facilitating service and adjustment of the inner parts of the motor 2.

The motor is preferably used in pipes having a substantially circular cross section, but could also be used in e.g. pipes having a square or elliptic cross section depending on to which type of pipe cross section the pipe cleaning tool is adapted.

Water can preferably be used as fluid as water does not pollute the environment when discharged to the surroundings. Other non-toxic and environmentally friendly fluids, possibly containing water, are also possible to use. Other fluids such as oil could be used in the motor shown in Figure 2 if no forward cooling fluid outlet are arranged , the system for the fluid thus being a completely closed loop.

When arranging more than one fluid outlet on the motor 2, it is preferred to arrange the fluid outlets 8, 10, 84, 86 equally distributed along the periphery of the motor 2 as shown in Figures 4-6. If e.g. beween eight to sixteen fluid outlets are arranged in the motor 2, e.g four fluid outlets 8, 10, 84, 86 are directed towards a respective arm and the remaining fluid outlets, e.g. 100, 102, 104, 106, etc., are directed in other directions.

The invention also relates to a device for cleaning of pipes comprising a hydraulically driven motor 2 according to any one of the embodiments described above, where the device further comprises a pipe cleaning tool 200 connected to the forward output shaft 4 of the motor 2. The forward end F of the motor 2 is arranged to be radially positioned in the pipe 1 either by the pipe cleaning tool 200 or by at least two optionally on the motor 2 arranged forward support means 80, 82 (shown in dashed lines in the Figure 2).

Claims

1. Hydraulically driven motor (2) with a motor body (3) and a rotating forward output shaft (4) for driving a pipe cleaning tool (200) inside a pipe (1), the hydraulically driven motor (2) comprising at least one fluid inlet (6), at least one fluid outlet (8, 10, 84, 86), and a hydraulically driven impeller (12) arranged in an impeller cavity (14) in the motor (2), where a fluid flow (v) from the at least one fluid inlet (6) via the impeller cavity (14) to the at least one fluid outlet (8, 10) is arranged to force the impeller (12) to rotate together with the thereto connected forward output shaft (4) on which the pipe cleaning tool (200) is arranged to be mounted, where the hydraulically driven motor (2) comprises at least two rear arms (16, 18, 88, 90) comprising at least one respective distal support means (20, 22, 92, 94) which rear arms (16, 18, 88, 90) extend in a backward direction from and are pivotally connected to a rear part of the motor body (3), characterised in, that the motor (2) further comprises means (28) arranged to force the distal support means (20, 22, 92, 94) apart and into abutment with the inner surface (30) of the pipe (1), thus positioning the rear part (R) of the motor (2) radially (r) in the pipe (1), where the means (28) arranged to force the distal support means (20, 22, 92, 94) apart comprise at least two fluid outlets (8, 10, 84, 86) and therefrom discharged fluid flows (32, 34, 96, 98) where the fluid flow (32, 34, 96, 98) discharged from the respective fluid outlet (8, 10, 84, 86) is arranged to force the distal end of the respective rear arm (16, 18, 88, 90) towards the inner surface (30) of the pipe (1).

2. Hydraulically driven motor (2) according to claim 1, characterised in, that fluid outlets (8, 10, 84, 86) in the means (28) arranged to force the distal support means (20, 22, 92, 94) apart are connected to an upstreams arranged pressure chamber (58) for equalisation of fluid outlet pressures in the fluid outlets (8, 10, 84, 86).

3. Hydraulically driven motor (2) according to any one of the above claims, characterised in, that respective distal support means (20, 22, 92, 94) are integrated in the respective arm (16, 18, 88, 90).

4. Hydraulically driven motor (2) according to any one of the claims 1-3, characterised in, that the respective distal support means (20, 22, 92, 94) are of wheel type and are arranged rotatably connected to the respective rear arm (16, 18, 88, 90).

5. Hydraulically driven motor (2) according to any one of the above claims, characterised in, that the respective distal support means (20, 22, 92, 94) have sharp edges.

6. Hydraulically driven motor (2) according to any one of the above claims, characterised in, that the impeller (12) is a radial impeller, that the impeller cavity (14) comprises at least one impeller cavity fluid inlet (40, 42) arranged at the side of the impeller cavity (14) and at least one respective impeller cavity fluid outlet (44, 46) angularly displaced in the direction of impeller rotation from the respective impeller cavity fluid inlet (40, 42) by an angle (?, ?) of rotation enabling at least one impeller wing (50, 52) to be positioned between an impeller cavity fluid inlet (40, 42) and a respective impeller cavity fluid outlet (44, 46) at all possible impeller rotational angles.

7. Hydraulically driven motor (2) according to claim 6, characterised in, that the impeller (12) comprises impeller wings (50, 52) with substantially radially (r) arranged trailing sides (70) and at an acute angle thereto connected leading sides (72).

8. Hydraulically driven motor (2) according to any one of the above claims, characterised in, that the motor (2) comprises at least one forward cooling fluid outlet (66, 68) arranged connected to at least one fluid inlet (6) for cooling of the pipe cleaning tool (200) by fluid (f).

9. Hydraulically driven motor according to any one of the above claims, characterised in, that the respective arm (16, 18, 88, 90) and/or distal support means (20, 22, 92, 94) is removably mounted for adaptation of the hydraulically driven motor (2) to various pipe inner diameters (D).

10. Hydraulically driven motor according to any one of the above claims, characterised in, that the hydraulically driven motor (2) comprises a removable arm (74) for positioning of the motor (2) in the pipe (1) before starting of the motor (2).

11. Device for cleaning of pipes, the device comprising a hydraulically driven motor according to any one of claims 1-10, characterised in, that the device further comprises a pipe cleaning tool (200) connected to the forward output shaft (4) of the motor (2).

12. Device according to claim 11, characterised in, that the forward end (F) of the motor (2) is arranged to be radially (r) positioned in the pipe (1) by the pipe cleaning tool (200).

13. Device according to claim 11, characterised in, that the forward end (F) of the motor (2) is arranged to be radially (r) positioned in the pipe (1) by at least two on the motor (2) arranged forward support means (80, 82).