Pumping device

Abstract

The invention relates to a pumping device comprising a housing (6) and a progressive cavity pump, the housing (6) having an internal channel (11) connected to a first opening and a second opening, the progressive cavity pump comprising a stator and a rotor. The housing (6) includes a flange (25), a recess (26) arranged around the second opening and opening onto the internal channel (11), and a conical inner wall (28) opposite the recess. The stator (16) has a first end comprising a conical outer wall (36) and a first flange (38); the outer wall (36) of the stator bearing against the inner wall (28) of the housing; the first flange (38) of the stator being fixed to the flange (25) of the housing. Figure to be published with the abbreviation: Figure 2

Description

Title of the invention: Pumping device Technical field of the invention

[0001] The present invention relates to a pumping device comprising a progressive cavity pump. State of the prior art

[0002] Generally, the progressive cavity pump is fixed by axial longitudinal clamping between a casing and a discharge pipe. The clamping is implemented by rods provided with threaded ends usually called "tie rods". However, when the stator is formed by a profiled metal tube, these tie rods can cause axial deformation of the stator and cause deformation of the stator pitch. Deformations of the stator pitch generate friction between the rotor and the stator and a loss of hydraulic performance of the pump. This friction can cause premature wear of the rotor or the stator.

[0003] Furthermore, the tie rods transmit the forces experienced from one end of the pump to the other end of the pump. Presentation of the invention

[0004] An object of the present invention is to provide a pumping device in which the stator would not be deformed. Summary of the invention

[0005] The present invention relates to a pumping device comprising a casing and a progressive cavity pump, the casing comprising an inner channel connected to a first opening and to a second opening, a drive shaft capable of pivoting about an axis, the progressive cavity pump comprising a stator and a rotor connected to the drive shaft; a radial plane being perpendicular to the axis; characterized in that the casing further comprises a collar, a recess arranged around the second opening and opening onto the inner channel and an inner wall of conical shape opposite the recess, and in that the stator comprises a first end comprising an outer wall of conical shape and a first flange extending in the radial plane; the outer wall of the stator bearing against the inner wall of the casing; the first flange of the stator being fixed to and in contact with the collar of the casing.

[0006] Advantageously, the cooperation between the two conical walls forms a means of centering the stator relative to the casing. Advantageously, the cooperation between the two conical walls constitutes a friction surface capable of preventing rotation of the stator relative to the casing.

[0007] Advantageously, this pumping device does not require indexing of the stator on a stop to fix the position of the stator relative to the casing (also called pump body).

[0008] Advantageously, the assembly and disassembly of the stator is simplified. When assembling the stator, the stator is fitted around the rotor which is fixed to a drive shaft. The stator is centered by pivoting it around the rotor until it stops in one direction, pivoting it in the opposite direction until it stops and then pivoting it through an angle allowing centering with respect to the two stops.

[0009] Advantageously, the forces exerted at one end of the stator are not transmitted to the other end of the stator.

[0010] The features set out in the following paragraphs may optionally be implemented. They may be implemented independently of one another or in combination with one another: - the collar comprises at least two holes, and in which the pumping device comprises at least one clamping strap comprising at least two through holes and fixing screws; the fixing screws having threaded heads and rods, the heads bearing against said at least one clamping strap; the threaded rods passing through the through holes and being screwed into the tapped holes of the collar; the clamping strap being arranged bearing against a face of the first flange of the stator. - The collar extends beyond the first stator flange in a plane parallel to the radial plane, the threaded rods being arranged opposite an edge of the first stator flange. - It comprises at least two tightening straps, each tightening strap having the shape of an angular portion of a flat ring; said angular portion extending over an angular range of between 45° and 180°, and preferably between 80° and 100°.

[0011] - The casing has an internal shoulder opposite the recess. - It has a seal placed against the inner shoulder. Advantageously, this type of seal is considered a hygienic seal.

[0012] - The first end of the stator has a radial face bearing against the seal sealing. - The inner shoulder comprises a groove, said seal being arranged in said groove.

[0013] - The recess is formed in the collar.

[0014] - It comprises at least one foot fixed to the collar of the casing.

[0015] - It comprises a discharge conduit comprising a collar, an opening, a recess surrounding the opening and opening into an interior space, an interior wall of conical shape opposite the recess, and wherein the stator comprises a second end having a second conically shaped outer wall and a second flange extending in a second radial plane, the second outer wall of the stator bearing against the inner wall of the discharge pipe, the second flange of the stator being fixed to and in contact with the collar of the discharge pipe. Advantageously, the cooperation between the two conical walls forms a means of centering the stator relative to the discharge pipe. Advantageously, the cooperation between the two conical walls is carried out on a friction surface capable of preventing rotation of the stator relative to the discharge pipe. The stator comprises a tube profiled in a helical shape, the profiled tube being made of metal. Brief description of the figures

[0016] [Fig.l] is a side view along a vertical plane of a pumping device according to the invention;

[0017] [Fig.2] is a sectional view of a first end of the stator and the casing of the pumping device, according to a sectional plane illustrated in [Fig.3];

[0018] [Fig.3] is a perspective view of a first end of the stator and the casing;

[0019] [Fig.4] is a sectional view of a second end of the stator and the re conduit displacement of the pumping device, according to a section plane parallel to the section plane illustrated in [Fig.3]. Detailed description of the invention

[0020] With reference to [Fig.l], the pumping device 2 according to the invention comprises a rotation drive device 4, a casing 6, a progressive cavity pump 8 and a delivery conduit 10.

[0021] The drive device 4 comprises a motor and geared motor type device. The drive device 4 has been shown schematically in [Fig.l]. It has an output shaft 12. The output shaft is coupled to a drive shaft 14 which is housed in the housing. The output shaft 12 is rotated about an axis of rotation AA. In the present patent application, the axial direction is a direction parallel to the axis of rotation AA. A radial plane is any plane perpendicular to the axis of rotation AA.

[0022] The casing 6, generally called the pump body, comprises an internal channel 11 connected to a first opening 13 and to a second opening 15 shown in [Fig.2],

[0023] The progressive cavity pump 8 comprises a stator 16 and a helical rotor 18 housed in the stator. The stator 16 comprises a tube profiled in a helical shape. The profiled tube is made of metal. The stator delimits a helical interior cavity. The stator comprises a first end 20 connected to the second opening 15 of the casing and a second end 22 connected to an opening of the discharge duct 10. The rotor 18 is coupled to the drive shaft 14. The rotor 18 is rotated by the drive shaft 14.

[0024] The pumping device further comprises feet 24 fixed to the casing 6 and to the discharge conduit 10.

[0025] With reference to Figures 2 and 3, the casing 6 comprises a collar 25. Advantageously, the collar 25 is located at an outlet end 27 of the casing. The collar 25 comprises four holes. Preferably, the holes 29 are tapped. Advantageously, the tapped holes 29 are distributed angularly in a regular manner.

[0026] Alternatively, the collar 25 has two holes. Alternatively, the collar 25 has more than two holes.

[0027] The foot 24 is fixed to the collar 25 by screws.

[0028] The casing 6 further comprises a recess 26 opening onto the internal channel 11. The recess 26 is arranged around the second opening 15. The recess is preferably formed in the collar.

[0029] The casing 6 comprises an inner wall 28 of conical shape and an inner shoulder 30. The inner wall 28 and the inner shoulder 30 delimit the recess 26. The inner wall 28 and the inner shoulder 30 are opposite the recess 26.

[0030] The casing further comprises a seal 32 disposed against the inner shoulder 30.

[0031] The first end 20 of the stator comprises a first opening 34 fixed to the second opening of the casing.

[0032] The first end 20 of the stator further comprises an outer wall 36 of conical shape suitable for cooperating with the inner wall 28 of the casing. In particular, the outer wall 36 of the stator bears against the inner wall 28 of the casing, when the stator 16 is fixed to the casing.

[0033] The first end 20 of the stator further comprises a radial face 37. Preferably, the radial face 37 bears against the seal 32.

[0034] The first end 20 of the stator comprises a first flange 38 extending in a first radial plane.

[0035] In the embodiment shown but in no way limiting, the outer wall 36 is an outer wall of the first flange 38.

[0036] With reference to [Fig. 3], the pumping device 2 comprises two clamping straps 40 and fixing screws 42 adapted to fix the first flange to the collar of the stator.

[0037] The clamping straps 40, also called clamping flanges, are arranged to bear against a face 44 of the first flange 38 of the stator. They press the first flange of the stator against the collar of the casing. Each clamping strap 40 has the shape of an angular portion of a flat ring. This angular portion extends over an angle of 90° in the embodiment illustrated in the figures.

[0038] Alternatively, the tightening straps 40 may extend over an angular range of between 45° and 180° and, preferably, between 80° and 100°.

[0039] The clamping straps 40 each comprise a through hole 46 at one of their ends.

[0040] The fixing screws 42 have heads 48 bearing against a clamping strap and threaded rods 50 passing through the holes 46 of the clamping straps. The threaded rods 50 are screwed into the tapped holes 29 of the casing collar.

[0041] The collar 25 extends in a radial direction R beyond the first flange 38 of the stator. The threaded rods 50 are arranged opposite an edge 52 of the first flange of the stator.

[0042] Alternatively, the pumping device 2 comprises a single clamping strap 40.

[0043] Alternatively, the pumping device 2 comprises three or four clamping straps. 40.

[0044] According to a variant not shown, the inner shoulder 30 comprises a groove and the sealing gasket 32 ​​is housed in the groove. Alternatively, the pumping device 2 does not include a seal 32.

[0045] The attachment between the second end 22 of the stator and the discharge duct 10 is identical to the attachment between the first end 20 of the stator and the casing.

[0046] In particular, the second end 22 of the stator is identical to the first end 20 of the stator.

[0047] Thus, with reference to [Fig.4], the second end 22 of the stator comprises a second opening 51 fixed to an opening 56 of the discharge duct.

[0048] The second end 22 of the stator comprises a second outer wall 53 of conical shape suitable for cooperating with an inner wall 60 of the discharge duct. The second outer wall 53 bears against the inner wall 60 of the discharge duct, when the discharge duct is fixed to the stator.

[0049] The second end 22 of the stator comprises a second flange 55 extending in a second radial plane.

[0050] In the embodiment shown, the second outer wall 53 is formed on the second flange.

[0051] The discharge duct 10 comprises a collar 54. Advantageously, the collar 54 is located at an inlet end of the discharge duct. The collar 54 comprises four holes 57. Preferably, the holes are tapped. Advantageously, the holes 57 are distributed angularly in a regular manner around the discharge duct.

[0052] Alternatively, the collar 54 has two or more holes.

[0053] A foot 24 is fixed to the collar 54.

[0054] The discharge duct 10 comprises a recess 58 open onto the interior space of the discharge duct and arranged around the opening 56. The recess 58 is preferably formed in the collar 54.

[0055] The discharge conduit 10 comprises an inner wall 60 of conical shape and a shoulder 62. The inner wall 60 and the shoulder 62 delimit the recess 58.

[0056] The discharge duct 10 further comprises a seal 64 arranged against the shoulder 62. The second end of the stator comprises a radial face 63 bearing against the seal 64.

[0057] The pumping device further comprises two clamping straps 40 and fixing screws 42 shaped to fix the second flange 55 to the collar 54 of the discharge conduit.

[0058] The fixing of the second end of the stator 22 to the discharge duct 10 using the clamping straps 40 and the fixing screws 42 is identical to the fixing of the first end 20 of the stator to the casing 6. It will not be described a second time. Alternatively, the stator is made using a metal tube with an elastomer lining. The elastomer lining has a helical internal shape.

Claims

Claims

1. Pumping device (2) comprising a casing (6) and a progressive cavity pump (8), the casing (6) comprising an inner channel (11) connected to a first opening (13) and to a second opening (15), a drive shaft (14) capable of pivoting about an axis (AA), the progressive cavity pump comprising a stator (16) and a rotor (18) connected to the drive shaft; a radial plane (P) being perpendicular to the axis (AA); characterized in that the casing (6) further comprises a collar (25), a recess (26) arranged around the second opening (15) and opening onto the inner channel (11) and an inner wall (28) of conical shape opposite the recess, and in that the stator (16) comprises a first end (20) comprising an outer wall (36) of conical shape and a first flange (38) extending in the radial plane (P); the outer wall (36) of the stator bearing against the inner wall (28) of the casing;the first flange (38) of the stator being fixed to and in contact with the collar (25) of the casing.;

2. Pumping device (2) according to claim 1, wherein the collar (25) comprises at least two holes (29), and wherein the pumping device (2) comprises at least one clamping strap (40) comprising at least two through holes (46) and fixing screws (42); the fixing screws (42) having heads (48) and threaded rods (50), the heads (48) bearing against said at least one clamping strap; the threaded rods (50) passing through the through holes (46) and being screwed into the tapped holes (29) of the collar; the clamping strap being arranged bearing against a face (44) of the first flange (38) of the stator.

3. Pumping device (2) according to claim 2, in which the collar (25) extends beyond the first flange (38) of the stator in a plane parallel to the radial plane (P), the threaded rods (50) being arranged opposite an edge (52) of the first flange of the stator.

4. Pumping device (2) according to any one of claims 2 and 3, which comprises at least two clamping straps (40), each clamping strap (40) has the shape of an angular portion of a flat ring; said angular portion extending over an angular range of between 45° and 180°, and preferably between 80° and 100°.

5. Pumping device (2) according to any one of claims 1 to 4, in which the casing (6) has an internal shoulder (30) opposite the recess (26).

6. A pumping device (2) according to claim 5, which comprises a seal (32) disposed against the inner shoulder (30).

7. Pumping device (2) according to claim 6, in which the first end of the stator (20) comprises a radial face (37) bearing against the seal (32).

8. A pumping device (2) according to claim 6, wherein the inner shoulder (30) comprises a groove, said seal being arranged in said groove.

9. A pumping device (2) according to any one of claims 1 to 8, wherein the recess (26) is formed in the collar (25).

10. Pumping device according to any one of claims 1 to 9, which comprises at least one foot (24) fixed to the collar (25) of the casing.

11. Pumping device (2) according to any one of claims 1 to 10, which comprises a discharge conduit (10) comprising a collar (54), an opening (56), a recess (58) surrounding the opening and opening into an interior space, an interior wall (60) of conical shape opposite the recess, and in which the stator (16) comprises a second end (22) having a second exterior wall (53) of conical shape and a second flange (55) extending in a second radial plane, the second exterior wall (53) of the stator bearing against the interior wall (60) of the discharge conduit, the second flange (55) of the stator being fixed to and in contact with the collar (54) of the discharge conduit.

12. Pumping device (2) according to any one of claims 1 to 11, wherein the stator (16) comprises a tube profiled in a helical shape, the profiled tube being made of metal.

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