MX2013006143A

MX2013006143A - Impeller for accelerating blasting abrasive.

Info

Publication number: MX2013006143A
Application number: MX2013006143A
Authority: MX
Inventors: Jost Wadephul
Original assignee: Jost Wadephul
Priority date: 2010-12-03
Filing date: 2011-11-23
Publication date: 2013-10-17
Also published as: WO2012072208A1; RU2013130106A; DE102010053172A1; EP2646196A1; CA2819421A1; DE102010053172B4; JP2013544194A; US20130337727A1; BR112013013686A2

Abstract

The invention relates to an impeller for feeding, into the shot-blasting wheel of a blasting installation, a blasting abrasive that is to be accelerated. Said impeller can be arranged in the central region of the shot-blasting wheel inside a distributor sleeve (12) with a discharge opening (22), and has, on at least one lateral disc (24), guiding elements (20a, 20b) for guiding the blasting abrasive towards the outside, each of said guiding elements (20a, 20b) having two lateral surfaces (26a, 26b) which, with guiding elements (20a, 20b) adjacent to the lateral surfaces (26a, 26b), form channels (18) through which the blasting abrasive can be discharged towards the outside. One or each of the guiding elements (20a, 20b) has an upper side (34a, 34b) that connects the outer ends (32a, 32b) of the two lateral surfaces (26a, 26b) of the guiding element (20a, 20b) to one another, and that has at least one section (38a, 38b, 40, 42 a-c) which is arranged in or above an imaginary, non-curved reference plane (36) connecting the lateral surfaces (26a, 26b) of the guiding element (20a, 20b) to one another, likewise at their outer ends.

Description

DRIVER TO ACCELERATE ABRASIVE FOR TREATMENT WITH JET DESCRIPTION OF THE INVENTION The invention relates to an impeller for feeding abrasive for jet treatment, to be accelerated in the centrifugal wheel of a jet treatment plant, the impeller can be placed in the central region of the centrifugal wheel within a distribution sleeve that has a dispensing opening and the impeller has, on at least one side disc, guiding members for guiding the jet treatment abrasive to the outside, wherein the guide members each have two side surfaces which form , with side surfaces of adjacent guide members channels through which the jet treatment abrasive is downwardly dischargeable. The invention also relates to a jet treatment facility having a centrifugal wheel, the jet treatment facility has this impeller.

Jet treatment facilities equipped with centrifugal wheels are used, for example, to free surfaces of metal products from scale and / or rust before the surface receives a protective coating, wherein the jet-treating abrasive generally comprises fine metal particles that are thrown against the surface. In such a jet treatment installation, all the particles of the jet-treating abrasive preferably move outwards tangentially and as parallel as possible to the blades of the rotating centrifugal wheel. However, this is often not the case. A considerable number of these particles impinge on the side discs and blades and bounce off of them, in a manner comparable to a ping-pong ball. This not only has a negative effect on the exit velocity of the blasting abrasive from the centrifugal wheel, but also results in a non-uniform distribution of the blasting abrasive on the surface to be cleaned. As a result of the blasting abrasive particles impacting against the parts of the centrifugal wheel, the latter also undergoes a high degree of wear.

In order to improve the abrasive distribution of jet treatment and also to reduce wear on the centrifugal wheel it is known to distribute what is known as an impeller at the center of this centrifugal wheel. The impeller is also subjected to a high degree of wear. As a rule, it is housed in a distributor sleeve which coaxially surrounds it and has a distribution or discharge opening. During the operation of the jet treatment plant, the jet treatment abrasive is guided in the axial direction to the center of the impeller. The impeller is placed in rapid rotation and guides the blasting abrasive radially outwardly along the drive channels formed by adjacent guide members. In the space between the distributor sleeve and the impeller the jet treatment abrasive enters a virtually circular path and circulates in this region along this circular path. Taking the rotation of the impeller into consideration, the jet treatment abrasive is finally transferred as tangentially as possible from the dispensing opening in the distributor sleeve into the operating region of the blades of the centrifugal wheel. This results in a smooth transition of the blasting abrasive in the vane region of the centrifugal wheel over the full width, with subsequent uniform acceleration to the exit from the vane. It is subsequently avoided that the jet treatment abrasive collides with the blades and side walls of the centrifugal wheel.

The object of the invention is to optimize this impeller, in particular with respect to its service life.

This objective is obtained by an impeller having the features of claim 1.

Correspondingly one or each guide member of an impeller according to the invention in each case has an upper side which is directed radially outwards and connected to outer ends of the two lateral surfaces of the guide member by joining them and which it has at least one section which is distributed either within or above an imaginary non-curved reference plane connecting the mentioned lateral surfaces (channel delimiters) of the guide member together, in a manner similar to the outer ends.

According to the first alternative mentioned in the foregoing of the invention, a section of the upper side, placed above the imaginary reference plane, consequently projects radially outwards, surpassing the reference plane. In the second alternative according to the invention, this section is located precisely within the imaginary reference plane.

Both modes QS result in a particular shape of the space between the upper side of the respective guide member and that section of the distributor sleeve surrounding the impeller which is opposite the upper side.

Tests by the applicant have shown that this structural shape of the impeller guide members, during the operation of the jet treatment installation, results in particularly low wear of the impeller and also of the centrifugal wheel, in the center of the which the impeller is housed in a state installed in the jet treatment installation. In addition, the jet treatment abrasive distribution and the jet treatment pattern of the jet treatment installation are particularly uniform.

Generally, according to the invention, all of the sections on the upper side or the regions on the upper side forming the upper side are distributed at and / or above the imaginary reference line. Accordingly, according to the invention, in a variant all the upper side sections or regions can be distributed above the reference plane. In another variant, all of the upper side sections can be located in the reference plane. Finally, in a third variant, at least one section of the upper side can be located in the reference plane and at the same time at least one section of the upper side can be located above the reference plane.

With respect to at least one section of the upper side which is positioned above the reference plane, the upper side can generally be extended in a curved or non-curved manner or in an inclined or non-inclined manner with respect to the plane of reference.

Preferably, the guide member is symmetrically formed to a longitudinal central plane that extends in a particularly axial manner of the guide member. In addition, each guide member in this case is preferably distributed over the impeller so that each of the respective longitudinal center planes extends substantially radially.

In a preferred embodiment of the invention, the upper side of the guide member has, on both sides of the longitudinal center plane, in each case at least one section positioned above the reference plane, the section extending inclined with with respect to the imaginary reference plane. Each of the two sections in this case extends, in each case, in an inclined manner with respect to the imaginary reference plane so that the respective section has a positive inclination, in each case as seen from the lateral surface adjacent to the respective section in the direction of the longitudinal central plane and with respect to the reference plane. In other words, the height of the respective section increases with respect to the reference plane in each case in the notional progress event in the direction of the longitudinal center plane. Preferably, each of these two sections is also directly adjacent to the lateral surface of the guide member that is adjacent thereto.

The two inclined sections mentioned before the surface extending on both sides of the longitudinal central plane can be connected together directly or by at least one connection section, extending at least regionally in a curved manner, on the upper side.

In a further embodiment of the invention, on both sides of the longitudinal central plane in each case at least one section of the non-curved upper side is located which is adjacent in particular to the respective lateral surface and which is distributed within the reference plane imaginary. In this case, the two sections naturally extend in this mode, in a non-inclined manner with respect to the reference plane.

These sections of the upper side that extend into the reference plane are also preferably connected together by a connecting section.

In a further configuration of this embodiment, the connection section preferably has sections of connection parts which in each case are adjacent to the section of the respective upper side and which in each case extend perpendicularly or approximately perpendicular to it and which are distributed above the reference plane and also a section of a connecting part connecting the sections of the perpendicular connection section mentioned before joining them and extending in a parallel or approximately parallel to the upper side and equal sections. way they are above the reference plane.

As regards the opposite side surfaces mentioned before the adjacent guide members, the lateral surfaces laterally delimit the channels between the guide members, these side surfaces preferably extend in a parallel or approximately parallel manner to each other and are spaced apart from each other. yes.

With regard to the guide members themselves, these may be, for example, in the form of a solid block or, for example, they may be constructed from individual profiled pieces or profiled strips. Here different variants are conceivable.

Additional features of the invention can be obtained from the appended claims, the following description of a preferred exemplary embodiment and the accompanying figures, in which: Figure 1 shows a schematic sectional view of an impeller according to the invention.

Figure 1 shows an impeller 10 which is distributed inside a sleeve 12 distributors of a jet treatment plant (which is not illustrated in greater detail). In this jet treatment plant, the surfaces of the components are subjected to accelerated abrasive jet treatment by the jet treatment installation. As a result, the surfaces of the component can be cleaned or freed from layers of disruptive surfaces, for example rust and scale or the like.

The impeller 10 is housed, together with the sleeve 12 that surrounds it in the center of a centrifugal wheel (not shown) of the jet treatment installation. The structure of the jet treatment installation is in principle known from the prior art. A centrifugal wheel inserted in a jet-driven and engine-driven installation has a plurality of centrifugal wheel blades disposed in a distributed manner in the circumferential direction along a side disc to accelerate the blasting abrasive. First, the jet treatment abrasive to be accelerated is supplied to the impeller 10 through a feed line (not shown). More precisely, the jet treatment abrasive is directed away from an abrasive jet treatment source or a jet treatment abrasive tank to the center 14 of the impeller. During the operation of the jet treatment installation, the impeller 10 is placed in rotation about the rotational axis 16 by an impeller (not shown). The jet treatment abrasive supplied centrally thereto is guided along the channels 18 towards the exterior of the impeller 10. The channels 18 in this case are formed by pairs of lateral surfaces 26a, 26b of adjacent guide members 20a, in the first modality or 20b, in the second modality.

Through the channels 18, the jet treatment abrasive passes from radially forward to radially further forward and is accelerated in the direction of rotation of the impeller 10 on a circular path between the guide members 20a or 20b and the sleeve. 12. By means of the discharge opening 22 in the sleeve 12, the jet treatment abrasive finally exits in the angular region of the blades of the centrifugal wheel (not shown). Here, the jet treatment abrasive exits substantially tangentially from the discharge opening 22. This results in a smooth transition of the jet treatment abrasive in the blade region, radially further outwardly from the centrifugal wheel (not shown) over the entire width, with subsequent uniform acceleration until the blades exit. The jet treatment abrasive is substantially prevented from impacting the blades and the side walls of the centrifugal wheel. The impact-free transition of the jet treatment abrasive from the impeller 10 acts as a central accelerator in the centrifugal wheel (not shown) by carrying out a uniform guide of the blasting abrasive on the centrifugal wheel. As a result, a uniform distribution of the jet treatment abrasive is obtained on the surface to be treated. In addition, the wear on the centrifugal wheel is reduced and also the energy applied to accelerate the blasting abrasive.

The impeller 10 illustrated has, as already indicated above, two different embodiments, 20a and 20b of guide members. The different modalities are illustrated together in figure 1 only for the sake of simplicity. In fact, during operation, an impeller 10 according to the invention generally has only one type of guide members, i.e. either the guide members 20a or the guide members 20b. In the text that follows, all the identical features of the two modalities, 20a and 20b, are first described together. Then the differences between the modalities 20a and 20b are illustrated.

The guide members 20a and 20b are distributed on an end side of a first side disk 24. A second side disc (not shown) is placed opposite and parallel, and spaced apart from the first side disc 24 in the axial direction so that the guide members 20a and 20b are positioned between the two side discs. In this regard it is noted that in the context of the invention, the guide members 20a and 20b can in principle be manufactured as separate components but can of course also be connected in one piece to the side of the respective end of the side discs.

The guide members 20a and 20b are raised with respect to the plane of the end side of the side disk 24, ie they form elevations with respect to this plane. In principle, it is also conceivable to supply with a second side disc and use only a side disc.

The individual guide members 20a and 20b are positioned in a distributed manner in the circumferential direction along an annular surface on the end side of the side disc 24. In the present case, the annular surface at the same time forms the peripheral region of the end side of the side disc 24.

Each guide members 20a and 20b are separated in the circumferential direction of the two guide members 20a and 20b which in each case are immediately adjacent to it on both sides.

The lateral surfaces 26a and 26b of the guide members 20a and 20b extend, first, perpendicularly to the plane of the figure and therefore perpendicular to the end side of the side disc 24 in the axial direction. In addition, the illustrated side surfaces 26a and 26b are directed towards the distribution sleeve 12 in the cross-sectional view in Figure 1. Accordingly, they extend radially inwardly radially outwardly, substantially radially or in a manner not inclined with respect to the radial direction.

At their ends 28a and 28b, which are directed towards the center 14 of the impeller or towards the rotational axis 16 of the impeller or at its radially inner ends 28a and 28b, the side surfaces 26a and 26b are connected together by means of a lower side 30. The lower side forms a uniform connection plane, that is, without curves.

At their two radially outer, upper ends 32a and 32b, the side surfaces 26a and 26b are connected together by means of an upper side 34a (guide member 20a) or 34b (guide member 20b). Similarly, the upper sides 34a and 34b extend perpendicularly to the end side of the side disc 24, ie, in the axial direction.

The contour of the respective upper side 34a and 34b is particularly important. In the text that follows, the entire outline 34a of the guide member 20a is first described.

The entire upper side 34a extends above an imaginary reference plane 36, illustrated by dashed lines in Figure 1, ie, radially outwardly as the reference plane 36. The imaginary reference plane 36 is a non-curved connecting plane which connects the two upper lateral ends 32a and 32b of the side surfaces 26a and 26b joining them by the shortest path.

Like the entire guide member 20a, the upper side 34a is symmetrically formed to a longitudinal central plane 21 extending axially. On both sides of the longitudinal center plane 21 it has two (non-curved) sections 38a and 38b, each of which is adjacent the lateral surface ends 32a, 32b. These non-curved sections 38a and 38b extend above the imaginary reference plane 36. In addition, the non-curved sections are inclined at an angle OI with respect to the reference plane 36. In this case the inclination is extended so that the passage, for example of the non-curved section 38a increases with respect to the reference plane 36, that is, it is positive. In this case, the direction of observation is defined as the starting direction from the lateral surface end 32a adjacent to the section 38a not curved towards the longitudinal central plane 21. In other words, the height of the non-curved section 38a increases with respect to the reference plane 36, specifically when viewed in that direction. In a similar manner, the passage of the section 38 increases, specifically in a similar manner with respect to the reference plane 36, but observed in the opposite direction, i.e., starting from the side surface end 32b adjacent the unbent section 38b towards the longitudinal central plane 21.

The two non-curved sections 38a and 38b are additionally connected by joining by a connecting section 40. The latter is formed in a convex manner.

In general, the result of the outline of the illustrated upper side of the guide member 20a is that the space between the upper side 34a and the sleeve section opposite the upper side 34a, in each case starting forward - depending on the direction of rotation of the impeller - of the outer side surface end 38a or 38b, first narrows to the smallest spatial volume in the connecting section 40 and subsequently widens again towards the rear side surface end.

The second embodiment of a guide member 20b differs from the guide member 20a by the contour of the upper side 34b. Unlike the case of the non-curved sections 38a and 38b of the guide member 20a, the non-curved sections 38a and 38b of the guide member 20b are not inclined with respect to the reference plane 36 but are located exactly within the plane 36 of reference.

In addition, the connecting section 40 connecting the two non-curved sections 38a and 38b is in the form of a projection type: The two upper side sections 38a and 38b located in the reference plane 36 are adjacent by sections of part 42a and 42b of connection section 40, the part sections 42a and 42b each extend perpendicularly to the upper side sections 38a and 38b but are located above the reference plane 36. A section of connecting portion 42c in turn is similarly positioned above the reference plane 36 and extends perpendicularly to the sections of connecting portion 42a and 42b and also parallel to sections 38a and 38b which in turn connect the connecting part sections 42a and 42b joining them.

The tests performed by the applicant have shown that the guide members have a basic structure as illustrated and claimed within the scope of this application result, for example, in particularly long service life of the respective driver, particularly prolonged service durations of the centrifugal wheels and a particularly uniform abrasive treatment pattern.

LIST OF REFERENCE NUMBERS 10 Impeller 12 Distributor sleeve 14 Driving Center 16 Rotational axis 18 Channel 20th Guide member 20b Guide member 21 Longitudinal central plane 22 Discharge opening 24 Side disc 26a Lateral surface 26b Side surface 28a Lateral surface end 28b Side surface end 30 Bottom side 32a Lateral surface end 32b Side surface end 34th Top side 34b Upper side 36 Reference plane 38th Section 38b Section 40 Connection section 42nd Part Section 42b Part section 42c Part section

Claims

1. Impeller for feeding jet treatment abrasive, to be accelerated in the centrifugal wheel of a jet treatment plant, the impeller is placeable in the central region of the centrifugal wheel inside a distribution sleeve having a discharge opening and the The impeller has, on at least one side disc, guiding members for guiding the jet treatment abrasive to the outside, wherein the guiding members each have two side surfaces which they form, with the lateral surfaces of the guards. adjacent guide members channels through which the blasting abrasive is discharged to the outside, characterized in that one or each of the guide members has, in each case, an upper side which connects the outer ends of the guides. two lateral surfaces of the guide member together and which has at least one section which is distributed at or above a plane d The imaginary non-curved reference that connects the lateral surfaces of the guide member together in the same manner as its outer ends.

2. Impeller as described in claim 1, characterized in that the guide member is symmetrically formed to a longitudinal central plane of the guide member.

3. An impeller as described in claim 2, characterized in that the upper side of the guide member has, on both sides of the longitudinal central plane, in each case at least one non-curved section placed above the imaginary reference plane.

4. Impeller as described in claim 2 or 3, characterized in that the upper side of the guide member has, on both sides of the longitudinal central plane, in each case at least one section which is adjacent in particular to the respective lateral surface and is it extends in an inclined manner with respect to the imaginary reference plane, wherein the inclination is configured such that the passage with respect to the reference plane of the section increases in each case as seen in the direction of the longitudinal central plane.

5. Impeller as described in claim 4, characterized in that the two upper side sections extending on both sides of the longitudinal central plane are connected by directly joining by at least one connection section extending at least regionally in a curved manner of the top side.

6. Impeller as described in claim 4 or 5, characterized in that the two inclined sections are not curved.

7. An impeller as described in one of the preceding claims 2 to 6, characterized in that on each side of the longitudinal central plane there is placed in each case at least one section of the non-curved upper side which is adjacent in particular to the respective lateral surface and which is placed in the imaginary reference plane.

8. Impeller as described in claim 7, characterized in that the upper side sections placed in the imaginary reference plane on both sides of the longitudinal central plane are connected together by at least one connection section.

9. Impeller as described in claim 8, characterized in that the two sections of the upper side are connected together by two connecting sections extending on both sides of the longitudinal central plane, adjacent to the respective upper side section and extending perpendicularly or approximately perpendicular to the latter and a connection section connecting the perpendicular connection sections mentioned above together and extending in a manner parallel or approximately parallel to the upper side sections.

10. Impeller as described in one or more of the preceding claims, characterized in that the lateral delimiting channel surfaces of the adjacent guide members extend in a parallel or approximately parallel manner with each other and are separated from each other.

11. Impeller as described in one or more of the preceding claims, characterized in that all of the upper side sections are distributed and / or above the imaginary reference plane connecting the side surfaces.

12. Jet treatment installation having a centrifugal wheel, a distributor sleeve which is placed in the central region of the centrifugal wheel and which has a discharge opening and an impeller placed inside the distributor sleeve having the features of the claim 1.