Drilling pump

Abstract

The subject of this invention is a drilling pump comprising: an axially extending stator, an axially extending rotor arranged in and radially surrounded by the stator, and a plurality of coils, each having a first axial coil end and an opposing second axial coil end, wherein the stator is alternately provided with: a plurality of axially extending, rotor-facing teeth, each having a first axial tooth end and an opposing second axial tooth end; and radially recessed, axially extending, coil-receiving grooves between adjacent teeth, wherein the corresponding second axial coil ends are bent in the region of the second axial coil ends and thereby arranged to be radially offset relative to the first axial coil ends toward the rotor to radially surround at least one tooth, the corresponding first axial coil ends axially surrounding at least one first axial tooth end and the corresponding second axial coil ends axially surrounding at least one second axial tooth end.

Description

Technical Field

[0001] The present invention relates to a drilling pump having: an axially extending stator, an axially extending rotor arranged in and radially surrounded by the stator, and a plurality of coils, each of the plurality of coils having a first axial coil end and an opposing second axial coil end, wherein the stator is alternately provided with: a plurality of axially extending teeth facing the rotor, each of the teeth having a first axial tooth end and an opposing second axial tooth end; and radially recessed, axially extending grooves between adjacent teeth for receiving the coils.

[0002] The invention also relates to a method for applying a plurality of coils, each having a first axial coil end and an opposing second axial coil end, to an axially extending stator of a drilling pump having an axially extending rotor arranged in and radially surrounded by the stator, wherein the stator is alternately designed with: a plurality of axially extending, rotor-facing teeth, each having a first axial tooth end and an opposing second axial tooth end; and radially recessed, axially extending grooves for receiving the coils between adjacent teeth. Background Technology

[0003] A borehole pump is a type of pump known from existing technology and used to transport fluids such as water or, in particular, oil from underground deposits. Such a pump is typically placed in a borehole until it is immersed in the fluid or descends into the fluid-laden soil layer and remains there.

[0004] Manufacturing such a borehole pump, especially the coil of its motor, is complex and costly in this case, particularly due to the use of expensive insulated submarine cables for the coil winding. Because of the limited structural space for borehole pumps used in smaller diameter boreholes, manufacturing the pump coil can take up to 16 hours. Introducing the winding into the pump stator is complex and often leads to failures, as the insulated submarine cable becomes sticky at high temperatures. Repairing faulty windings or coils is typically impossible due to limited structural space. Similarly, maintenance during continuous operation is virtually impossible due to the equipment within the borehole. Summary of the Invention

[0005] Based on this situation, the object of the present invention is to provide a drilling pump and a corresponding manufacturing method, thereby enabling the drilling pump to be manufactured and maintained more simply and cost-effectively.

[0006] The object of this invention is achieved by the features of a drilling pump. Advantageous design options are given in the detailed description and claims.

[0007] Accordingly, this objective is achieved by a drilling pump having: an axially extending stator, an axially extending rotor arranged in and radially surrounded by the stator, and a plurality of coils, each coil having a first axial coil end and an opposing second axial coil end, wherein

[0008] The stator is alternately designed with: a plurality of axially extending teeth facing the rotor, each tooth having a first axial tooth tip and an opposing second axial tooth tip; and radially recessed, axially extending grooves between adjacent teeth for receiving the coil.

[0009] The corresponding second axial coil end is bent within the region of the second axial coil end and is thus arranged to be radially offset relative to the first axial coil end toward the rotor to radially surround at least one tooth, and

[0010] The corresponding first axial coil end axially surrounds at least one first axial tooth end and the corresponding second axial coil end axially surrounds at least one second axial tooth end.

[0011] In an alternative design, this objective is achieved by a motor, particularly for a pump having: an axially extending stator, an axially extending rotor arranged within and radially surrounded by the stator, and a plurality of coils, each coil having a first axial coil end and an opposing second axial coil end, wherein...

[0012] The stator is alternately designed with: a plurality of axially extending teeth facing the rotor, each tooth having a first axial tooth tip and an opposing second axial tooth tip; and radially recessed, axially extending grooves between adjacent teeth for receiving the coil.

[0013] The corresponding second axial coil end is bent within the region of the second axial coil end and is thus arranged to be radially offset relative to the first axial coil end toward the rotor to radially surround at least one tooth, and

[0014] The corresponding first axial coil end axially surrounds at least one first axial tooth end and the corresponding second axial coil end axially surrounds at least one second axial tooth end.

[0015] An important aspect of the proposed borehole pump is that the coil is axially pushed onto the stator and correspondingly can also be pushed off the stator again for axial removal. In this regard, it is possible to manufacture the coil outside the stator and apply it to the stator only after the winding has been subsequently manufactured. This significantly reduces the manufacturing time of the borehole pump and allows for replacement of faulty coils during operation. Because the end of the second axial coil is arranged radially offset to surround at least one tooth, the wound coil can be first pushed into the two grooves with the end of the second axial coil until the end of the first axial coil abuts against the end of the first axial tooth, and correspondingly can be removed from the stator again.

[0016] A borehole pump, also known as a water-powered pump or vertical pump, can be inserted into narrow boreholes or wells with a small inner diameter. For this purpose, the borehole pump preferably has a cylindrical housing or is in the form of a column that can be inserted into the borehole. Correspondingly, the stator is also preferably designed in the form of a column. The rotor preferably drives an impeller to transport fluid. In principle, borehole pumps can be used to transport various fluids, such as water, wastewater, or oil. The coils preferably have multiple windings and / or, when viewed from above, have a rectangular shape that extends between the ends of a first axial coil and in the ends of a second axial coil. The stator or borehole pump can preferably have a circular inner diameter and / or an inner diameter of 10 cm, 20 cm, 30 cm, 40 cm, or 50 cm. Correspondingly, these teeth can preferably be formed in a circular diameter within the stator. The borehole pump can be designed as a rotary pump.

[0017] The teeth preferably extend completely between the ends of two opposing axial teeth. Two coils are preferably wound in the grooves. These grooves are preferably radially recessed relative to the rotor. Preferably, the grooves are almost completely, preferably completely, filled with the windings. The end of the second coil is preferably bent toward the rotor in such a way that the bending can surround at least one tooth when the coil is arranged in the groove. In other words, this bending preferably has a die with at least one tooth. When such a bent or angled coil is pushed onto the at least one tooth, the at least one tooth does not interfere with the coil. The windings are preferably designed from insulated metal wire and / or submarine cable. These windings can have circular, cubic, or square cross-sections. The coils and / or windings are preferably made of metal wire, especially insulated metal wire (e.g., enameled wire), and / or bent, especially L-shaped. More preferably, the windings are not made using casting techniques, for example, not cast, and / or made in a non-casting manner, especially without castings. The motor is preferably used for pumps, especially rotary pumps, and particularly preferably for drilling pumps.

[0018] According to a preferred improvement, the corresponding first axial coil end and / or the corresponding second axial coil end are arranged axially outside the groove and / or teeth, and / or the corresponding second axial coil end is arranged radially outside the groove and / or teeth. When the coil is fully pushed into the groove, the second axial coil end is preferably close to these teeth in an axial planar view. The axial exterior of the groove and / or teeth specifically refers to the area around which the coil is surrounded when viewed axially from above.

[0019] According to another preferred design, the corresponding second axial coil end is orthogonally bent toward the rotor within the region of the second axial coil end. Preferably, the coil has a longitudinal extension between its axial coil ends, which is larger than the longitudinal extension of the groove or tooth. The coil may include multiple windings arranged vertically and / or side-by-side with each other. Correspondingly, individual windings can be arranged with radially offset lengths within the region of the second axial coil end. For example, the windings arranged closer to the rotor in the region of the second axial coil end can be designed with significantly less radial offset, while the windings arranged farther from the rotor are designed with more radial offset relative to this, so that the two types of windings of the coil can “slide” on the at least one tooth with their radially offset second axial coil ends when axially introduced into the groove. In an axial side view, the coil may have an L-shaped form.

[0020] According to a preferred improvement, the first axial coil end and / or the second axial coil end axially contact and surround the at least one first axial tooth end and / or the at least one axial second tooth end, and / or the corresponding second axial coil end is arranged to radially contact and surround at least one tooth. In this regard, "contact" can also mean that the coil is as close to the tooth as possible.

[0021] According to a preferred design, the grooves receive the coils in a precisely fitting manner, and / or the grooves have a triangular and / or V-shaped cross-section in the radial direction. Preferably, multiple windings from two coils are arranged in each groove, each winding being arranged over the entire axial extension within the groove. Preferably, the coils within the stator region are only disposed within the grooves and do not extend radially toward the rotor beyond the teeth. The multiple windings are preferably arranged vertically to each other in the axial direction, especially in the case of a triangular and / or V-shaped cross-section of the groove, which also appears triangular and / or V-shaped in the side view.

[0022] According to a preferred improvement, the coils are arranged to overlap and / or stagger in the regions of the first axial coil ends and / or the second axial coil ends, particularly outside the stator; and / or these coils have a rectangular shape. The drilling pump is preferably designed as a three-phase pump, such that the windings of each phase can be sequentially introduced into the grooves at intervals and arranged to overlap and / or stagger, particularly outside the stator, in the regions of the first axial coil ends and / or the second axial coil ends. Preferably, the stator has 6, 9, 12, or 15 grooves and a corresponding number of teeth or windings. The stator may be enclosed by a housing or designed as the housing of the drilling pump.

[0023] The object of the invention is also achieved by a method for applying a plurality of coils, each having a first axial coil end and an opposing second axial coil end, to an axially extending stator of a drilling pump having an axially extending rotor arranged in and radially surrounded by the stator, wherein

[0024] The stator is alternately designed with: a plurality of axially extending teeth facing the rotor, each tooth having a first axial tooth tip and an opposing second axial tooth tip; and radially recessed, axially extending grooves between adjacent teeth for receiving coils. The method includes the following steps:

[0025] Within the region of the second axial coil end, the corresponding second axial coil end is bent until the second axial coil end is arranged to be radially offset relative to the first axial coil end toward the rotor, so as to radially surround at least one tooth; and

[0026] In the axial direction, the corresponding coil is first pushed into at least two grooves with a bent second axial coil end until the corresponding first axial coil end axially surrounds at least one first axial tooth end and the corresponding second axial coil end axially surrounds at least one second axial tooth end.

[0027] In an alternative design, this objective is achieved by applying a plurality of coils, each having a first axial coil end and an opposing second axial coil end, to an axially extending stator, particularly for a pump, which has an axially extending rotor arranged in and radially surrounded by the stator.

[0028] The stator is alternately designed with: a plurality of axially extending teeth facing the rotor, each tooth having a first axial tooth tip and an opposing second axial tooth tip; and radially recessed, axially extending grooves between adjacent teeth for receiving coils. The method includes the following steps:

[0029] Within the region of the second axial coil end, the corresponding second axial coil end is bent until the second axial coil end is arranged to be radially offset relative to the first axial coil end toward the rotor, so as to radially surround at least one tooth; and

[0030] In the axial direction, the corresponding coil is first pushed into at least two grooves with a bent second axial coil end until the corresponding first axial coil end axially surrounds at least one first axial tooth end and the corresponding second axial coil end axially surrounds at least one second axial tooth end.

[0031] The proposed method allows individual coils or all coils together to be introduced into the stator from the transverse side in a particularly simple manner, i.e., pushed into at least two grooves, especially in the axial direction. Compared to coils known in the prior art (i.e., coils that are either already wound in the grooves or first introduced into the free area of ​​the stator and then radially outwardly squeezed into the grooves), the proposed method allows the coils to be directly inserted into the grooves from the transverse side of the stator. For this reason, even with a drilling pump arranged in the borehole, faulty coils or all coils together can be removed from the stator by axial pushing. This is not possible in designs known in the prior art. During pushing, the bent second axial coil end preferably slides on at least one tooth, while the unbent portion of the coil slides through at least two grooves.

[0032] According to a preferred improvement, the method includes the following steps:

[0033] The winding is used to obtain a bent coil in such a way that, after being pushed, the corresponding first axial coil end can axially surround at least one first axial tooth end, the corresponding second axial coil end can axially surround at least one second axial tooth end, and the corresponding second axial coil end can radially surround at least one tooth in the region of the corresponding second axial tooth end toward the rotor.

[0034] In other words, the winding is preferably carried out in such a way that the curved end of the second axial coil surrounds at least one tooth in a U-shape in the side view. The winding is further preferably carried out in such a way that the axial extension of the coil is greater than, equal to, or almost equal to the radial extension of the tooth or groove.

[0035] According to another preferred improvement, the method includes the following steps:

[0036] Arrange the corresponding first axial coil end and / or the corresponding second axial coil end in such a way that the first axial coil end and / or the second axial coil end are located axially outside the groove and / or the tooth; and / or arrange the corresponding second axial coil end in such a way that the second axial coil end is located radially outside the groove and / or the tooth.

[0037] According to a preferred improvement, the method includes the following steps:

[0038] The corresponding second axial coil ends are bent orthogonally toward the direction of the rotor.

[0039] The bending is preferably performed such that the end of the second axial coil is arranged orthogonally to the end of the first axial coil. Preferably, only a small portion of the coil is bent, such that the coil extends primarily in the axial direction and only in the radial direction relative to the at least one tooth.

[0040] According to another preferred improvement, the method includes the following steps:

[0041] These coils are arranged to overlap and / or stagger, and / or in a rectangular shape, within the region of the first axial coil end and / or within the region of the second axial coil end.

[0042] According to a preferred improvement, the method includes the following steps:

[0043] The bent coil is laminated in a mold used to obtain the bent coil.

[0044] Further design options and / or advantages of this method have been derived by those skilled in the art in a manner similar to that of the borehole pump described above. The same principle applies to motors as to borehole pump implementations. Attached Figure Description

[0045] The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

[0046] In the attached diagram:

[0047] Figure 1 A perspective view of the stator of a drilling pump having multiple teeth, each with a coil applied to one of the teeth, is shown for a preferred embodiment.

[0048] Figure 2 A perspective view showing the relationship between the two ends of the second axial coil is provided. Figure 1 The stator of the drilling pump,

[0049] Figure 3 The side views of the first and second axial coil ends are shown respectively. Figure 1and Figure 2 The stator, and

[0050] Figure 4 A three-dimensional diagram is shown based on Figures 1 to 3 The coil. Detailed Implementation

[0051] Figure 1 A perspective view of the first axial coil end 4 of a preferred embodiment shows the stator 1 of a drilling pump having a plurality of teeth 2, each with a coil 3 applied to these teeth. Figure 2 A perspective view of the opposite second axial coil end 5 is shown according to Figure 1 The stator. Figure 3 The stator 1 is shown below in a side view with respect to the first axial coil end 4 and above in a side view with respect to the second axial coil end 5. Finally Figure 4 Coil 3 is shown in a 3D diagram.

[0052] Figures 1 to 3 The borehole pump shown is used to deliver fluid in a borehole (not shown) in which the pump is lowered. Typically, the inner diameter of the borehole is only slightly larger than or equal to the outer diameter of the borehole pump or stator 1. Inside the borehole pump, the columnar stator 1 extends axially. A rotor 6, also axially extended, is arranged radially around and in this case within the stator 1; this rotor is not shown in the figure, but rather... Figure 1 Through line 6 and in Figure 3 The middle section is shown through circle 6.

[0053] Multiple teeth 2 extend from the surface of the stator 1 toward the rotor 6. Each tooth 2 has a cubic shape, and between these teeth are grooves 7 that are triangular in side view, such as those that can be particularly well seen from... Figure 3 This can be seen from the diagram. Two adjacent coils 3 are wound in each groove 7, for which the groove 7 or the windings are each sized in a precisely fitting manner. Similarly, the axially extending groove 7, radially recessed between two adjacent teeth 2, can have a cubic shape, while the teeth 2 are designed as triangles in the side view.

[0054] Each tooth 2 has a first axial tooth end 8 and an opposing second axial tooth end 9. The corresponding first axial coil end 4 surrounds the corresponding first axial tooth end 8 and is guided to axially surround the corresponding tooth 2 or the corresponding groove 7, as if from... Figure 1 and Figure 3 This can be seen from the lower part. In other words, the corresponding first axial coil end 4 does not extend radially toward the rotor 6 beyond the corresponding tooth 2, but extends axially beyond the groove 7.

[0055] In contrast, the corresponding second axial coil end 5 is orthogonally bent within the region of the second axial coil end 5 and extends radially toward the rotor 6 such that the bent second axial coil end 5 extends radially beyond the corresponding tooth 2 (as shown in the side view). Figure 3 (As shown above), however, it is thus arranged axially close to the end of the second axial tooth 9 and the end of the second axial tooth 9 is axially outside the corresponding tooth 2 or the corresponding groove 7 (to... Figure 2 (As shown in the perspective view). In other words, the corresponding second axial coil end 5 is bent in the region of the second axial coil end 5 and is thus arranged to be radially offset relative to the first axial coil end 4 toward the rotor 6 to radially surround at least one tooth 2.

[0056] To manufacture the drilling pump, the corresponding second axial coil end 5 is orthogonally bent within its region until it is arranged radially offset relative to the first axial coil end 4 toward the rotor 6, radially surrounding at least one tooth 2. Thus, in the axial direction, the corresponding coil 3 is first axially pushed into at least two grooves 7 with the bent second axial coil end 5, until the corresponding first axial coil end 4 axially surrounds at least one first axial tooth end 8 and the corresponding second axial coil end 5 axially surrounds at least one second axial tooth end 9. Correspondingly, the coil 3 thus pushed onto the stator 1 can be axially pushed out of the stator 1 or groove 7 again in the opposite direction, for example, to replace a faulty coil 3.

[0057] In order to create such a Figure 4 The coil 3 shown is wound with multiple strands that can be axially pushed into the stator 1, such that after being pushed, the corresponding first axial coil end 4 can axially surround at least one first axial tooth end 8, the corresponding second axial coil end 5 can axially surround at least one second axial tooth end 9, and the corresponding second axial coil end 5 can surround at least one tooth 2 in the region of the corresponding second axial tooth end 9 toward the rotor 6. In other words, these strands are wound into a rectangular shape, wherein the U-shaped ends are orthogonally bent relative to the rest of the rectangle.

[0058] The winding can be fixed using molding theory and enameled wire. A needle-type winding machine can also be used to fix the winding. The thus bent coil 3 is then laminated in a mold (not shown). This method is repeated for each coil 3. To ensure uniform insulation, spacing retainers made of casting material and / or by bandages in the form of adhesive tape can be used. Although not shown in the figures, the coils 3 can be arranged in an overlapping and / or staggered manner within the region of the first axial coil end 4 and within the region of the second axial coil end 5, each coil having multiple windings.

[0059] The above-described embodiments of drilling pumps are similarly applicable to motors. The described embodiments are merely examples, and these examples can be modified and / or supplemented in various ways within the scope of the claims. Each feature used to illustrate a particular embodiment can be used independently or in combination with other features in any other embodiment. Each feature used to illustrate an embodiment of a certain category can also be applied accordingly to embodiments of another category.

[0060] List of reference numerals

[0061] Stator 1;

[0062] Tooth 2;

[0063] Coil 3;

[0064] First axial coil end 4;

[0065] Second axial coil end 5;

[0066] Rotor 6;

[0067] Groove 7;

[0068] First axial tooth end 8;

[0069] Second axial tooth tip 9.

Claims

1. A drilling pump comprising: an axially extending stator (1), an axially extending rotor (6) disposed in and radially surrounded by the stator (1), and a plurality of coils (3), each of the plurality of coils having a first axial coil end (4) and an opposing second axial coil end (5), wherein The stator (1) is alternately designed with: a plurality of axially extending teeth (2) facing the rotor (6), each tooth having a first axial tooth tip (8) and an opposing second axial tooth tip (9); and radially recessed, axially extending grooves (7) between adjacent teeth (2) for receiving the coil (3). The corresponding second axial coil end (5) is bent in the region of the second axial coil end (5) and thus arranged to be radially offset relative to the first axial coil end (4) toward the rotor (6) to radially surround at least one tooth (2), and The corresponding first axial coil end (4) axially surrounds at least one first axial tooth end (8) and the corresponding second axial coil end (5) axially surrounds at least one second axial tooth end (9).

2. The drilling pump according to claim 1, wherein the corresponding first axial coil end (4) and / or the corresponding second axial coil end (5) are arranged axially outside the groove (7) and / or the tooth (2), and / or the corresponding second axial coil end (5) is arranged radially outside the groove (7) and / or the tooth (2).

3. The drilling pump according to claim 1, wherein the corresponding second axial coil end (5) is bent orthogonally toward the rotor (6) relative to the corresponding first axial coil end (4) in the region of the second axial coil end (5).

4. The drilling pump according to any one of claims 1 to 3, wherein the first axial coil end (4) and / or the second axial coil end (5) axially contacts at least one first axial tooth end (8) and / or at least one second axial tooth end (9), and / or the corresponding second axial coil end (5) is arranged to radially contact at least one tooth (2).

5. The drilling pump according to any one of claims 1 to 3, wherein the groove (7) receives the coil (3) in a precisely fitting manner.

6. The drilling pump according to claim 5, wherein the groove (7) has a triangular cross section in the radial direction.

7. The drilling pump according to any one of claims 1 to 3, wherein the groove (7) has a triangular cross section in the radial direction.

8. The drilling pump according to any one of claims 1 to 3, wherein the coil (3) is arranged to overlap and / or stagger in the region of the first axial coil end (4) and / or in the region of the second axial coil end (5).

9. The drilling pump according to claim 8, wherein the coil (3) has a rectangular shape.

10. The drilling pump according to any one of claims 1 to 3, wherein the coil (3) has a rectangular shape.

11. A method for applying a plurality of coils (3), each having a first axial coil end (4) and an opposing second axial coil end (5), to an axially extending stator (1) of a borehole pump having an axially extending rotor (6) arranged in and radially surrounded by the stator (1), wherein The stator (1) is alternately designed with: a plurality of axially extending teeth (2) facing the rotor (6), each tooth having a first axial tooth tip (8) and an opposing second axial tooth tip (9); and radially recessed, axially extending grooves (7) for receiving the coil (3) between adjacent teeth (2), the method comprising the following steps: Within the region of the second axial coil end (5), the corresponding second axial coil end (5) is bent until the second axial coil end (5) is arranged to be radially offset relative to the first axial coil end (4) toward the rotor (6) to radially surround at least one tooth (2); and In the axial direction, the corresponding coil (3) is first pushed into at least two grooves (7) with the curved second axial coil end (5) until the corresponding first axial coil end (4) axially surrounds at least one first axial tooth end (8) and the corresponding second axial coil end (5) axially surrounds at least one second axial tooth end (9).

12. The method according to claim 11, wherein the method comprises the following steps: The winding is used to obtain a curved coil (3) in such a way that after the coil (3) is pushed, the corresponding first axial coil end (4) is able to axially surround at least one first axial tooth end (8), the corresponding second axial coil end (5) is able to axially surround at least one second axial tooth end (9), and the second axial coil end (5) is able to surround at least one tooth (2) radially toward the rotor (6) in the region of the corresponding second axial tooth end (9).

13. The method according to claim 11, comprising the following steps: Arrange the corresponding first axial coil end (4) and / or the corresponding second axial coil end (5) in such a way that the first axial coil end (4) and / or the second axial coil end (5) are located axially outside the groove (7) and / or the tooth (2); and / or arrange the corresponding second axial coil end (5) in such a way that the second axial coil end (5) is located radially outside the groove (7) and / or the tooth (2).

14. The method according to any one of claims 11 to 13, comprising the following steps: The corresponding second axial coil end (5) is bent orthogonally toward the rotor (6) relative to the corresponding first axial coil end (4).

15. The method according to any one of claims 11 to 13, comprising the following steps: The coils (3) are arranged to overlap and / or interleave within the region of the first axial coil end (4) and / or within the region of the second axial coil end (5).

16. The method of claim 15, comprising the following steps: The coil (3) is arranged in a rectangular shape.

17. The method according to any one of claims 11 to 13, comprising the following steps: The coil (3) is arranged in a rectangular shape.

18. The method according to any one of claims 11 to 13, comprising the following steps: The bent coil (3) is laminated in a mold used to obtain the bent coil (3).

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