Method for the positioning of a cover disk of a pump and pump

Abstract

A method for the positioning of a cover disk with respect to an open impeller of a pump arranged in a pump housing. An adjustment bolt is first screwed so far into a threaded bore of the cover disk until it comes into contact with the pump housing. An identifier is subsequently applied which indicates a position of a first marking of the adjustment bolt. The adjustment bolt is then screwed in further until a second marking reaches the identifier. The described steps are repeated for at least one further adjustment bolt.

Claims

1. A method for the positioning of a cover disk with respect to an open impeller of a pump arranged in a pump housing, the method comprising: positioning the cover disk and the pump housing with respect to one another such that the cover disk comes into contact with the pump housing at the impeller and such that a predetermined spacing only has to be set in an axial direction between the cover disk and the impeller for reaching an end position of the cover disk; screwing a first adjustment bolt into a first threaded bore of the cover disk until a bolt end of the first adjustment bolt comes into contact with a contact surface of the pump housing, with the cover disk continuing to contact the impeller; applying an identifier at the cover disk or at the pump housing, the identifier identifying a position of a first marking of the first adjustment bolt; screwing in the first adjustment bolt until a second marking of the first adjustment bolt reaches the identifier such that the predetermined spacing between the cover disk and the impeller is thereby set; screwing a second adjustment bolt into a second threaded bore of the cover disk until a bolt end of the second adjustment bolt comes into contact with the contact surface of the pump housing, with the cover disk continuing to contact the impeller; applying a second identifier at the cover disk or at the pump housing, the second identifier identifying a position of a first marking of the second adjustment bolt; and screwing in the second adjustment bolt until a second marking of the second adjustment bolt reaches the second identifier such that the predetermined spacing between the cover disk and the impeller is thereby set, the first and second adjustment bolts having like threads comprising first and second markings made as notches at a periphery of the respective adjustment bolt and have different shapes and wherein the first and second adjustment bolts being arranged in a similar manner with respect to one another at the first and second adjustment bolts.

2. A method in accordance with claim 1, wherein the positioning the cover disk is carried out manually.

3. A method in accordance with claim 1, wherein the applying the first and second identifiers includes applying the first and second identifiers with a pen.

4. A method in accordance with claim 1, wherein the first and second markings at the periphery of the respective adjustment bolt have different colors.

5. A method in accordance with claim 1, wherein each of the first and second adjustment bolts has a third marking and a fourth marking, with the third marking being made in a manner corresponding to the first marking and the fourth marking being made in a manner corresponding to the second marking and the arrangement of the fourth marking with respect to the third marking corresponding to the arrangement of the second marking with respect to the first marking.

6. A method in accordance with claim 1, wherein at least four adjustment bolts are used.

7. A method in accordance with claim 1, wherein the pump is a rotary pump.

8. A method in accordance with claim 1, wherein the adjustment bolts are sleeves in which fastening elements are configured to be arranged by which the cover disk is fastened to the pump housing.

9. A method in accordance with claim 1, wherein positioning the cover disk includes positioning the cover disk such that the predetermined spacing is between 0.1 and 0.3 mm.

10. A method in accordance with claim 1, further comprising securing the position of the adjustment bolts at the predetermined spacing between the cover disk and the impeller.

11. A method in accordance with claim 10, wherein the securing of the position of the adjustment bolts is by locking nuts.

12. A pump comprising: a pump housing having an open impeller arranged therein and having a cover disk for the impeller, the cover disk having at least two threaded bores in which a respective adjustment bolt is arranged by which, starting from a contact of the cover disk at the impeller, a predetermined spacing between the cover disk and the impeller is set, with bolt ends of the adjustment bolts only contacting contact surfaces of the pump housing on contact of the cover disk at the impeller and with the cover disk or the pump housing having identifiers at least during the setting of the predetermined spacing between the cover disk and the impeller, the identifiers identifying a position of a first marking of the adjustment bolts on contact of the cover disk at the impeller and identifying a position of a second marking of the adjustment bolts with the predetermined spacing between the cover disk and the impeller, with the adjustment bolts having like threads, the adjustment bolts furthermore comprising first and second makings made as notches at a periphery of a respective adjustment bolt and have different shapes, and the first and second markings being arranged in a similar manner with respect to one another at the adjustment bolts.

13. A method in accordance with claim 1, wherein positioning the cover disk includes positioning the cover disk such that the predetermined spacing is between 0.15 and 0.25 mm.

14. A method in accordance with claim 2, wherein the applying the first and second identifiers includes applying the first and second identifiers with a pen.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be explained in more detail hereinafter with reference to the drawings.

(2) FIG. 1 is a rotary pump in a sectional representation;

(3) FIG. 2 is a detail of FIG. 1; and

(4) FIG. 3 is an adjustment bolt with a part of a cover disk of a rotary pump in a plan view.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(5) In accordance with FIG. 1, a pump 10 in the form of a rotary or centrifugal pump has a pump housing 11 in which an open impeller 12 is arranged. The impeller 12 can rotate about an axis of rotation, which is aligned along an axial direction 13, and can be driven by a drive machine not shown, for example by an electric motor. A conveying medium, for example in the form of water, is supplied in the axial direction via an inlet 14 and is radially led off at elevated pressure via an outlet 15. A so-called cover disk 16 is arranged at a side of the impeller 12 remote from the inlet 14 and is fastened to the pump housing 11. The cover disk 16 has a predominantly ring-shaped basic shape with a total of four fastening eyelets 17a, 17b offset by 90, of which two are shown in FIG. 1. The number of adjustment bolts is in this respect selected in dependence on the size of the pump 10 and on the pressure at the outlet 15. More or fewer adjustment bolts can in this way also be used. An inner surface 18 of the cover disk 16 aligned in the direction of the impeller 12 is in this respect designed inclined such that it is adapted to the contour of the impeller 12. The cover disk 16 forms a conveying passage 19 of the pump 10 together with the pump housing 11.

(6) A first fastening eyelet 17a of the cover disk 16, which is shown enlarged in FIG. 2, has a first axially extending threaded bore 20 in the form of a through-hole having an inner thread not shown in detail. A first adjustment bolt 21 in the form of a sleeve having an outer thread not shown in detail is screwed into this threaded bore 20 such that a bolt end 22 of the adjustment bolt 21 contacts a contact surface 23 of the pump housing 11. The threaded bore 20 of the fastening eyelet 17a is in this respect flush with a threaded bore 24 in the form of a blind hole in the pump housing 11. A fastening bolt 25 projects through the adjustment bolt 21 and is screwed into the threaded bore 24 in the pump housing 11. A fixing of the cover disk 16 at the pump housing 11 is realized by means of the adjustment bolt 25. Furthermore, a locking nut 26 is arranged at the side of the cover disk 16 remote from the pump housing 11 at the adjustment bolt 21, with the locking nut tensioning the adjustment bolt 21 toward the fastening eyelet 17a of the cover disk 16 via the outer thread of the adjustment bolt 21. The design of the three other fastening eyelets and in particular of the used adjustment bolts, locking nuts and fastening bolts is identical.

(7) In its end position, the cover disk 16 should be arranged at a fixed desired spacing from the pump wheel 12 of approximately between 0.1 and 0.3 mm, in particular between 0.15 and 0.25 mm. If the spacing is too small, a contact between the pump wheel 12 and the cover disk 16 may occur and in this way result in damage. If the spacing is too large or non-uniform, the degree of efficiency of the pump 10 is not ideal.

(8) The desired spacing between the cover disk 16 and the pump wheel 12 has to be set on the assembly of the pump 10. For this purpose, the cover disk 16 is first positioned with respect to the pump housing 11 in a first step such that the threaded bores 20 of the fastening eyelets 17a, 17b are flush with the threaded bores 24 of the pump housing 11 and such that the cover disk 16 furthermore contacts the impeller 12. The impeller 12 could not rotate in this position of the cover disk 16 such that an axial displacement of the cover disk 16 is necessary. A suitable apparatus, not shown, can be used for the positioning of the cover disk 16.

(9) In a subsequent second step, the total of four adjustment bolts 21 are manually screwed in so far into the threaded bores 20 of the fastening eyelets 17a, 17b that the bolt ends 22 of the adjustment bolts 21 come into contact with the contact surfaces 23 of the pump housing 11. The adjustment bolts 21 are in this respect only screwed in so far that the cover disk 16 continues to contact the impeller 12 and does not yet lift off.

(10) In a subsequent third step, an identifier 27 which identifies a position of a first marking 28 at the periphery of the adjustment bolt 21 (see FIG. 3) is applied at the fastening eyelet 17a of the cover disk 12 using a pen. The first marking 28 has an outwardly open V-shaped contour and is marked in red, with the marking in red also being able to be dispensed with. It extends in the axial direction over the total length of the outer thread of the adjustment bolt 21. This is repeated for the three other adjustment bolts.

(11) In a subsequent fourth step, the adjustment bolt 21 is screwed in further using a wrench until a second marking 29 at the periphery of the adjustment bolt 21 reaches the identifier 27 at the fastening eyelet 17a of the cover disk 12 (not shown). The desired spacing between the cover disk 16 and the impeller 12 is in this way set at this fastening eyelet 17a. The second marking 29 has an outwardly open rectangular contour and is marked in green. It extends in the axial direction over the total length of the outer thread of the adjustment bolt 21. This is repeated for the three other adjustment bolts.

(12) The second marking 29 is in this respect arranged offset to the first marking 28 by 70 with respect to the direction of screwing in 30. The second marking can also be offset with respect to the first marking to a lesser or greater degree. The adjustment bolt 21 furthermore has a third marking 31 disposed diametrically opposite the first marking 28 and has a fourth marking 32 disposed diametrically opposite the second marking 29. The third marking 31 has an identical V-shaped design and an identical color identifier as the first marking 28. The fourth marking 32 has an identical rectangular design and an identical color identifier as the second marking 29. In this way, the identifier at the cover disk 16 can also be effected at the third marking 31 in the third step and, in the fourth step, the adjustment bolt 21 can subsequently be screwed in until the fourth marking is reached. The set spacing between the cover disk 16 and the pump wheel 12 is then the same as in the procedure described above.

(13) The locking nuts 26 are subsequently screwed onto the adjustment bolts 21 and tensioned with respect to the fastening eyelets 17a, 17b. In a fifth step, the fastening bolts 24 are finally screwed into the threaded bores 24 of the pump housing 11 such that the adjustment bolts 21 are pressed against the pump housing 11. The cover disk 16 is in this way connected to the pump housing 11 and the same desired spacing between the cover disk 16 and the pump wheel 12 is set and maintained everywhere by the adjustment bolts 21.

(14) The pump 10 has the identifier 27 at least during the setting of the desired spacing between the cover disk 16 and the impeller 12. The identifier 27 can be removed after the cover disk 16 has been fixedly connected to the pump housing 11.