Screw Spindle Pump

Abstract

The invention relates to a screw spindle pump, with a housing (2) which surrounds a delivery chamber (5), two spindles (7, 8), namely a drive spindle (7) and an opposed running spindle (8), a housing insert (6) which is arranged in the housing (2) and in which the spindles (7, 8) are accommodated, at least one bearing element (13, 13), which is connected to the housing insert (6) and on which bearings (12) of the spindles (7, 8) are arranged, and with at least one housing cover (14, 14), closing a housing opening. It is the object of the invention to provide a screw spindle pump at which maintenance and inspection work can be carried out more simply and cost-effectively. The invention achieves this object in that the bearing element (13, 13) together with the housing insert (6) and the spindles (7, 8) accommodated therein forms a unit (15) which, after the housing cover (14, 14) is taken off, is removable from the housing (2) through the housing opening.

Claims

1. A screw spindle pump, with a housing (2) which surrounds a delivery chamber (5), two spindles (7, 8), namely a drive spindle (7) and an opposed running spindle (8), a housing insert (6) which is arranged in the housing (2) and in which the spindles (7, 8) are accommodated, at least one bearing element (13, 13), which is connected to the housing insert (6) and on which bearings (12) of the spindles (7, 8) are arranged, and with at least one housing cover (14, 14), closing a housing opening, characterized in that the bearing element (13, 13) together with the housing insert (6) and the spindles (7, 8) accommodated therein forms a unit (15) which, after the housing cover (14, 14) is taken off, is removable from the housing (2) through the housing opening.

2. The screw spindle pump as claimed in claim 1, wherein the housing cover (14, 14) keeps the unit (15) in its axial position in the housing (2).

3. The screw spindle pump as claimed in claim 1, wherein the bearing element (13, 13) is designed as a bearing cover, the outside diameter of which is equal to the inside diameter of the housing opening.

4. The screw spindle pump as claimed in claim 1, characterized by a rotation lock which prevents an axial rotation of the unit.

5. The screw spindle pump as claimed in claim 1, characterized by lubricant channels (16, 16) formed in the bearing element (13, 13) for lubricating the bearings (12), wherein the lubricant channels (16, 16) open into at least one end-side lubricant opening in the bearing element (13, 13).

6. The screw spindle pump as claimed in claim 1, wherein the screw spindle pump has at least one removable guide rail arrangement (18) which has at least one guide rail (20, 28) which extends in the longitudinal direction of the screw spindle pump and on which the unit (15) is guided in the axial direction in the housing (2).

7. The screw spindle pump as claimed in claim 6, wherein the guide rail arrangement (18) has at least one support (22, 30) for holding or guiding the guide rail (20, 28).

8. The screw spindle pump as claimed in claim 6, wherein the support (22, 30) has an adjustment means (38, 42), in particular an adjustment screw, for orienting the unit (15) and/or the guide rail (20, 28).

9. The screw spindle pump as claimed in claim 6, wherein the guide rail arrangement (18) has two guide rails (20) which run parallel to each other and are arranged on the housing (2).

10. The screw spindle pump as claimed in claim 9, wherein the guide rails (20) each have a groove (36) which extends in the longitudinal direction of the guide rails (20).

11. The screw spindle pump as claimed in claim 9, wherein a supporting element (26) which runs horizontally is arranged on the housing insert (6), preferably on one of the base surfaces thereof, and at least partially rests on the guide rails (20).

12. The screw spindle pump as claimed in claim 11, wherein the supporting element (26) has rollers (34) which act on the guide rails (20).

13. The screw spindle pump as claimed in claim 10, wherein an adjustment means (38), in particular an adjustment screw, is arranged on the supporting element (26).

14. The screw spindle pump as claimed in claim 6, wherein the guide rail (28) is composed of a plurality of parts which are arranged one behind another and are detachable from one another.

15. The screw spindle pump as claimed in claim 6, wherein the guide rail arrangement (18) is arranged on the transmission side and/or drive side of the screw spindle pump.

Description

[0034] In the figures:

[0035] FIG. 1 shows a top view of a screw spindle pump according to the invention;

[0036] FIG. 2 shows a screw spindle pump according to FIG. 1 with front- and rear-side housing covers dismounted;

[0037] FIG. 3 shows the screw spindle pump according to FIGS. 1 and 2 with the unit consisting of bearing elements, housing insert and spindles removed;

[0038] FIG. 4 shows a screw spindle pump according to the invention in a sectioned side view;

[0039] FIG. 5 shows a schematic view of a screw spindle pump according to the invention with an embodiment of a rail guide arrangement,

[0040] FIG. 6 shows a schematic view of a screw spindle pump according to the invention with a further embodiment of a rail guide arrangement,

[0041] FIG. 7 shows a schematic view of an embodiment of a transmission-side rail guide arrangement according to the invention,

[0042] FIG. 8 shows a schematic view of an embodiment of a drive-side rail guide arrangement according to the invention.

[0043] The figures show an exemplary embodiment of a screw spindle pump according to the invention that is denoted overall by the reference number 1.

[0044] The latter has a housing 2 with an integrally formed inlet 3 and outlet 4. The housing 2 surrounds a delivery chamber 5 of the pump, in which a housing insert 6 is located. The housing insert 6 accommodates a drive spindle 7 and an opposed running spindle 8 therein. Two profile assemblies 7, 7 line of the drive spindle 7 are indicated schematically in FIG. 4. The profile assemblies of the drive spindle 7 and of the running spindle 8 mesh with each other and, together with pressure chambers 6 and 6 of the housing insert 6 that surround the profile assemblies with a small gap, form positive displacement chambers through which a fluid to be conveyed is conveyed axially from inlet chambers 9, which are connected to the inlet 3, into an outlet chamber 10 which is connected to the outlet 4. Partitions 11 of the housing insert 6 that are sealed in relation to the inner wall of the housing 2 seal the inlet chambers 9 in relation to the outlet chamber 10.

[0045] Bearings 12 of the spindles 7, 8 are formed on front- and rear-side bearing elements 13 and 13 in the form of bearing covers. The bearings 12 are rolling bearings.

[0046] A housing cover 14, 14 which closes a front-side or a rear-side opening in the housing 2 is arranged in each case on the front side and on the rear side of the housing 2. As illustrated in the figures, the housing covers 14, 14 have screw connection collars, via which the housing covers 14, 14 can be screwed to the housing 2.

[0047] According to the invention, it is provided that the bearing elements 13, 13 together with the housing insert 6 and the spindles 7, 8 accommodated in the latter form a unit which is denoted overall in FIG. 3 by the reference number 15. As shown in FIG. 3, the unit 15 is removable from the housing 2, through to the front opening therein, in the direction of the arrow after the housing cover 14 has been taken off.

[0048] It can be seen in FIGS. 2 and 4 that the housing covers 14, 14 keep the unit 15 consisting of bearing elements 13, 13, housing insert 6 and spindles 7, 8 in its axial position. The outside diameter of the bearing elements 13, 13, which is designed as bearing covers, is equal here to the inside diameter of the front-and rear-side housing openings, wherein the bearing elements 13, 13 each end flush in the axial direction on the end side of the housing 2 with the edge of the housing opening, and therefore the housing covers 14, 14 which are connected to the housing 2 lie flat against the bearing elements 13, 13 and thus keep the entire unit 15 in the axial position shown in FIGS. 2 and 4.

[0049] As FIG. 4 shows, lubricant channels 16 and 16 which serve to lubricate the bearings 12 are respectively formed in the bearing elements 13, 13. The lubricant channels 16, 16 open into end-side openings in the bearing elements 13 and 13, respectively, wherein said openings correspond to openings in lubricant channels 17, 17 formed in the housing covers 14, 14, and therefore lubricant can be supplied and removed via the housing covers 14, 14.

[0050] A transmission housing which accommodates a toothed transmission (not illustrated) which connects the drive spindle 7 to the running spindle 8 is formed in the housing cover 14.

[0051] FIG. 5 shows a schematic view of an embodiment of a screw spindle pump 1 according to the invention. The screw spindle pump 1 comprises a housing 2 which surrounds a delivery chamber, two spindles, a drive spindle 7 and an opposed running spindle 8, a housing insert 6 which is arranged in the housing 2 and in which the spindles 7, 8 are accommodated, and at least one bearing element 13 which is connected to the housing insert 2 and on which bearings 12 of the spindles 7, 8 are arranged. Furthermore, the screw spindle pump 1 has at least one removable guide rail arrangement 18, 18 which has at least one guide rail 20, 28 extending in the longitudinal direction of the screw spindle pump 1. In FIG. 1, the screw spindle pump 1 has both a transmission-side guide rail arrangement 18 and a drive-side guide rail arrangement 18.

[0052] The transmission-side guide rail arrangement 18 has two guide rails 20, 20 which run parallel to each other. By means of the two rails 20, 20 running parallel, it can be ensured that the unit 15 is oriented precisely parallel to the floor and can be introduced in the correct orientation into the housing 2. The guide rails 20, 20 are arranged on the housing 2. The guide rails 20, 20 are connected to each other by means of a transverse strut 24. By this means, the guide rail arrangement 18 is mechanically reinforced, as a result of which it can reliably absorb the high weight of the unit 15 without breaking in the process.

[0053] The transmission-side guide rails 20, 20 each have a support 22 at the end opposite the housing 2, as a result of which they can be oriented parallel to the floor. The supports 22 run perpendicularly to the floor and are preferably of telescopic design. The supports 22 are connected to the transverse strut 24.

[0054] A supporting element 26 is arranged on the housing insert 6 or on the unit 15. The supporting element 26 runs in particular horizontally and can at least partially rest on the guide rails 20, 20. By means of the supporting element 26, the unit 15 can be held by the rails 20, 20 and introduced into the housing 2 along the guide rails 20, 20. The supporting element 26 is preferably arranged on a base surface of the housing insert 6.

[0055] Furthermore, the screw spindle pump 1 has a drive-side guide rail arrangement 18. The guide rail arrangement 19 comprises a support 30 arranged on the housing 2 and a guide rail 28 arranged on the housing insert 6 or on the unit 15.

[0056] FIG. 6 shows a schematic view of a further embodiment of a screw spindle pump 1 according to the invention. In this embodiment, the guide rail 28 is of multi-part design. It is composed of more than one, and at least two, parts 28, 28 which are arranged one behind another and are detachable from one another. In the event of confined space conditions between motor and the housing 2, that part 28 of the guide rail 28 which protrudes on the drive side will therefore be removed. The guide rail 28 therefore does not stand in the way of the unit 15 being pushed into the housing 2. The individual parts 28, 28 of the guide rail 28 are preferably connected to one another with a force fit and/or form fit, ideally by means of a screw connection 32. By this means, the parts 28, 28 can be rapidly mounted together and dismounted from one another again.

[0057] FIG. 7 shows a schematic view of an embodiment of a transmission-side guide rail arrangement 18 according to the invention. The guide rails 20, 20 each have a groove 36. Particularly reliable guidance of the element which is to be guided is ensured by the groove 36. The groove 36 extends in the longitudinal direction of the guide rails 20, 20. The groove 36 ideally extends over the entire longitudinal extent of the guide rails 20, 20.

[0058] The supporting element 26 has roller-shaped bodies 34, preferably rollers. The rollers 34 are arranged on the supporting element 26 in such a manner that they can each come into contact with a guide rail 20, 20. The use of rollers 34 makes it possible for the unit 15 to be displaced with little friction. The rollers 34 are ideally arranged at the ends of the supporting element 26 and can thus roll along the two rails 20, 20 running parallel to each other, in particular in the grooves 36 thereof.

[0059] The supporting element 26 has at least one adjustment means 38, 38, in particular an adjustment screw. By means of the adjustment means 38, 38, the unit can be oriented both in the vertical and in the horizontal direction.

[0060] FIG. 8 shows a schematic view of an embodiment of a drive-side rail guide arrangement 18 according to the invention. The support 30 has an opening 44 through which the guide rail 28 can be conducted. The cross section of the opening 44 ideally corresponds precisely to the overall dimension of the guide rail 28. The opening 44 is advantageously of tetragonal design. The opening 44 can be designed to be variable in size. For this purpose, the support 30 can have an adjustment element 40 which can restrict that part of the opening 44 which receives the guide rail 28 in different ways and thereby adapts the size of the opening 44 to the dimensions of the guide rail 28. This has the result that the support 30 can be used for guide rails 28 of different size.

[0061] Furthermore, the support 30 also has adjustment screws 42, 42 in order to be able to orient the unit 15 both in the vertical direction and in the horizontal direction.

LIST OF REFERENCE SIGNS

[0062] 1 Screw spindle pump [0063] 2 Housing [0064] 3 Inlet [0065] 4 Outlet [0066] 5 Housing insert [0067] 6 Drive spindle [0068] 7 Running spindle [0069] 9 Inlet chamber [0070] 10 Outlet chamber [0071] 11 Partitions [0072] 13 Bearing [0073] 14 Housing cover [0074] 15 Unit [0075] 16 Lubricant channels [0076] 18 Guide rail arrangement [0077] 20, 20 Guide rail (on the transmission side) [0078] 22 Support (on the transmission side) [0079] 24 Transverse strut [0080] 26 Support of unit [0081] 28 Guide rail (on the drive side) [0082] 28, 28 Dividable guide rail (on the drive side) [0083] 30 Support (on the drive side) [0084] 32 Connecting element of guide rail [0085] 34 Rollers [0086] 36 Groove [0087] 38 Adjustment means (support of unit) [0088] 40 Adjustment element of opening [0089] 42 Adjustment means (support (on the drive side)) [0090] 44 Opening