Cable connecting device, submersible motor and submersible electric pump

Abstract

The utility model relates to the technical field of electric connecting devices of submersible motors, in particular to a cable connecting device, a submersible motor and an electric submersible pump. The cable connecting device comprises a cable joint and a motor joint, the cable joint comprises a cable shell and a cable connecting seat, a cable mounting hole is formed in the cable shell, the cable mounting hole is provided with a cable armoring hole for mounting an armoring section and a split-phase mounting hole for mounting a split-phase section, and the split-phase section is in sealing fit with the split-phase mounting hole through a sealing structure. The cable armoring hole is located at the top in the cable shell, the split-phase mounting hole is formed in the bottom of the cable armoring hole and penetrates through the cable shell and the cable connecting seat, the split-phase section extends into the split-phase mounting hole, penetrates out of the split-phase mounting hole and is connected with a stator lead in the motor connector, and the cable connecting seat is in sealing fit with the motor connector. According to the cable connecting device, the cable mounting hole is formed in the cable shell, so that the overall size of the cable connector is reduced, and the cable connector is suitable for a small-diameter submersible motor.

Description

Technical Field

[0001] The utility model relates to the technical field of electric connection devices for submersible motors, in particular to a cable connection device, a submersible motor and a submersible electric pump. Background Art

[0002] During oilfield development, submersible electric pumps are a crucial piece of equipment for oil production. They primarily transmit surface electricity to a submersible motor downhole via a cable connection, thereby driving the submersible pump. Specifically, the three-phase terminals extending from the cable connector are connected to the stator leads of the submersible motor, enabling power transmission. Currently, when manufacturing cable connection devices, the three-phase cores of the cable are typically designed in a "pin" shape. This "pin"-shaped cable connection is suitable for submersible motors with a minimum external dimension of 98mm, which are mostly used in casings 5 inches or larger. For casings smaller than 5 inches, the submersible motor's external dimensions must be even smaller, not exceeding 80mm. In these cases, there isn't enough space on the submersible motor to accommodate a "pin"-shaped cable connection.

[0003] For example, the Chinese invention patent with authorization announcement number CN118281622B discloses a cable sealing connection device for a small well submersible motor. Specifically, the cable sealing connection device includes a motor head and a cable housing plugged into a plug-in slot of the motor head. The cable housing adopts a two-part buckle installation structure, and a mechanical seal pressure adjustment mechanism is installed inside the housing by providing a sealing reinforcement sleeve. The sealing reinforcement sleeve (equivalent to the housing sealing structure) is located at the top of the cable housing. The bottom of the cable housing is provided with an anti-slip glue filling component, and a filling seal compensation mechanism is provided in the middle. The cable housing also includes a small flat cable disposed inside the cable housing. The small flat cable adopts an "I"-shaped structure and passes through the anti-slip glue filling component, the filling seal compensation mechanism, and the mechanical seal pressure adjustment mechanism in sequence. A conductive connector is plugged into the top of the small flat cable for electrical connection with the stator lead in the motor head. By designing the three-phase core of the cable as a small flat cable, that is, an "I"-shaped flat cable, the cable sealing connection device can ensure a small installation size. However, the cable housing's two-part snap-fit structure and the inclusion of a housing seal within it result in a relatively large housing size for the cable sealing connector, limiting the range of possible minimum installation dimensions. Furthermore, the integrated sealing and installation strength enhancements achieved through the use of a non-slip adhesive filler assembly, a mechanical seal force adjustment mechanism, and a filler seal compensation mechanism complicate the overall structure of the cable sealing connector, hindering further reduction in installation dimensions. Utility Model Content

[0004] The purpose of the utility model is to provide a cable connection device to solve the technical problem that the shell size of the cable connection device in the prior art is too large, resulting in a limited range of ensuring a smaller installation size.

[0005] The utility model also aims to provide a submersible motor, which solves the technical problem that there is not enough space on a small-diameter submersible motor to integrate a cable connection device.

[0006] The purpose of the utility model is also to provide a submersible electric pump, which solves the technical problem that the submersible electric pump cannot continuously and reliably extract underground crude oil or well fluid.

[0007] To achieve the above objectives, the present invention provides a technical solution for a cable connection device:

[0008] A cable connection device includes a cable joint and a motor joint. The cable joint includes a cable housing and a cable connection seat connected to the bottom of the cable housing. A cable installation hole is opened in the cable housing, and the cable is passed through the cable installation hole. The cable includes an armored section and three phase sections. The cable installation hole has a cable armor hole for installing the armored section and a phase installation hole for installing the three phase sections. The phase sections are sealed with the phase installation holes through a sealing structure. The cable armor hole is located at the top of the cable housing. The phase installation hole is opened at the bottom of the cable armor hole and passes through the cable housing and the cable connection seat. The phase section extends into the phase installation hole and passes through it to be connected to the stator lead in the motor joint. The cable connection seat is sealed with the motor joint.

[0009] Beneficial effect: Compared with the prior art, the utility model provides a new cable connection device, which directly sets a penetrating cable installation hole on the cable shell and the cable connection seat, and designs the cable installation hole as a cable armor hole that matches the cable armor section and a phase installation hole that matches the cable phase section. Through this structural design, the shell size of the cable connector can be designed to be minimized, so that there is enough space on the motor connector to install the cable connector, thereby achieving a wider range of smaller installation dimensions; at the same time, the phase section is sealed with the phase installation hole through the sealing structure, and the cable connection seat is sealed with the motor connector to ensure that oil will not enter the submersible motor through the cable connection device, so that the cable connection device has good sealing performance.

[0010] Furthermore, the three phase-separated mounting holes are arranged side by side and equidistantly at the bottom of the cable armor hole.

[0011] Furthermore, the diameter of the phase-splitting installation hole is larger than the diameter of the phase-splitting section of the cable.

[0012] Furthermore, the sealing structure includes a sealing pressure block and a lower stopper which are sequentially sleeved on the phase segment of the cable. The sealing pressure block and the lower stopper are sequentially pressed against and fixed into the phase mounting hole by locking top screws.

[0013] Furthermore, the sealing structure further includes an upper stopper, which is arranged above the sealing pressing block and contacts the bottom of the phase-splitting mounting hole.

[0014] Furthermore, epoxy resin is filled into the phase separation installation hole to fix the phase separation segment.

[0015] Furthermore, a sealing ring groove is provided on the outer peripheral surface of the locking top screw, and a sealing ring is provided in the groove to radially seal the phase separation section.

[0016] Furthermore, a groove is provided on the end surface of the bottom of the cable connection seat, and a sealing gasket is installed in the groove.

[0017] Furthermore, bolt mounting holes are provided on both sides of the cable connection seat, and the motor connector is connected to the cable connection seat by bolts.

[0018] Furthermore, the motor connector is a cylindrical structure, and its outer wall has a radial section along the radial direction and an axial oblique section along the axial direction. The radial section intersects with the axial oblique section and is arranged perpendicularly. The motor connector has a stator lead through-hole at the radial section, and the stator lead is located in the stator lead through-hole.

[0019] To achieve the above-mentioned purpose, the present invention provides a technical solution of a submersible motor:

[0020] A submersible motor includes a stator and a cable connection device, the cable connection device includes a cable joint and a motor joint, the cable joint includes a cable housing and a cable connection seat connected to the bottom of the cable housing, a cable installation hole is opened in the cable housing, a cable is passed through the cable installation hole, the cable includes an armored section and three phase sections, the cable installation hole has a cable armor hole for installing the armored section and a phase installation hole for installing the three phase sections, the phase sections and the phase installation holes are sealed and installed by a sealing structure, the cable armor hole is located at the top of the cable housing, the phase installation hole is opened at the bottom of the cable armor hole and passes through the cable housing and the cable connection seat, the phase section extends into the phase installation hole and passes through, and is connected to the stator lead in the motor joint, and the cable connection seat is sealed and installed with the motor joint.

[0021] Beneficial effect: The output shaft of the submersible motor is installed in conjunction with the motor connector of the cable connecting device. Since the cable connector of the cable connecting device is designed in the groove formed by the radial section and the axial oblique section of the outer wall of the motor connector, this design is conducive to better integration of the cable connecting device on a small-diameter submersible motor.

[0022] Furthermore, the three phase-separated mounting holes are arranged side by side and equidistantly at the bottom of the cable armor hole.

[0023] Furthermore, the diameter of the phase-splitting installation hole is larger than the diameter of the phase-splitting section of the cable.

[0024] Furthermore, the sealing structure includes a sealing pressure block and a lower stopper which are sequentially sleeved on the phase segment of the cable. The sealing pressure block and the lower stopper are sequentially pressed against and fixed into the phase mounting hole by locking top screws.

[0025] Furthermore, the sealing structure further includes an upper stopper, which is arranged above the sealing pressing block and contacts the bottom of the phase-splitting mounting hole.

[0026] Furthermore, epoxy resin is filled into the phase separation installation hole to fix the phase separation segment.

[0027] Furthermore, a sealing ring groove is provided on the outer peripheral surface of the locking top screw, and a sealing ring is provided in the groove to radially seal the phase separation section.

[0028] Furthermore, a groove is provided on the end surface of the bottom of the cable connection seat, and a sealing gasket is installed in the groove.

[0029] Furthermore, bolt mounting holes are provided on both sides of the cable connection seat, and the motor connector is connected to the cable connection seat by bolts.

[0030] Furthermore, the motor connector is a cylindrical structure, and its outer wall has a radial section along the radial direction and an axial oblique section along the axial direction. The radial section intersects with the axial oblique section and is arranged perpendicularly. The motor connector has a stator lead through-hole at the radial section, and the stator lead is located in the stator lead through-hole.

[0031] To achieve the above-mentioned purpose, the present invention provides a technical solution of a submersible electric pump:

[0032] A submersible electric pump comprises a pump body and a submersible motor, the submersible motor comprises a stator and a cable connecting device, the cable connecting device comprises a cable joint and a motor joint, the cable joint comprises a cable housing and a cable connecting seat connected to the bottom of the cable housing, a cable installation hole is opened in the cable housing, a cable is passed through the cable installation hole, the cable comprises an armored section and three phase sections, the cable installation hole has a cable armored hole for installing the armored section and a phase installation hole for installing the three phase sections, the phase sections and the phase installation holes are sealed and fitted together by a sealing structure, the cable armored hole is located at the top of the cable housing, the phase installation hole is opened at the bottom of the cable armored hole and passes through the cable housing and the cable connecting seat, the phase section extends into the phase installation hole and passes through, and is connected to the stator lead in the motor joint, and the cable connecting seat is sealed and fitted to the motor joint.

[0033] Beneficial effect: By integrating the cable connection device on the small-diameter submersible motor, the small-diameter submersible motor and the multi-stage centrifugal pump together form a submersible electric pump, which can dive into oil wells hundreds to thousands of meters deep and continuously and reliably extract underground crude oil or well fluid.

[0034] Furthermore, the three phase-separated mounting holes are arranged side by side and equidistantly at the bottom of the cable armor hole.

[0035] Furthermore, the diameter of the phase-splitting installation hole is larger than the diameter of the phase-splitting section of the cable.

[0036] Furthermore, the sealing structure includes a sealing pressure block and a lower stopper which are sequentially sleeved on the phase segment of the cable. The sealing pressure block and the lower stopper are sequentially pressed against and fixed into the phase mounting hole by locking top screws.

[0037] Furthermore, the sealing structure further includes an upper stopper, which is arranged above the sealing pressing block and contacts the bottom of the phase-splitting mounting hole.

[0038] Furthermore, epoxy resin is filled into the phase separation installation hole to fix the phase separation segment.

[0039] Furthermore, a sealing ring groove is provided on the outer peripheral surface of the locking top screw, and a sealing ring is provided in the groove to radially seal the phase separation section.

[0040] Furthermore, a groove is provided on the end surface of the bottom of the cable connection seat, and a sealing gasket is installed in the groove.

[0041] Furthermore, bolt mounting holes are provided on both sides of the cable connection seat, and the motor connector is connected to the cable connection seat by bolts.

[0042] Furthermore, the motor connector is a cylindrical structure, and its outer wall has a radial section along the radial direction and an axial oblique section along the axial direction. The radial section intersects with the axial oblique section and is arranged perpendicularly. The motor connector has a stator lead through-hole at the radial section, and the stator lead is located in the stator lead through-hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural schematic diagram of a cable connection device of the utility model;

[0044] Figure 2 for Figure 1 Cross-sectional view of the cable connector;

[0045] Figure 3 for Figure 2 Left view of;

[0046] Figure 4 for Figure 1 Cross-sectional view of the motor connector;

[0047] Figure 5 for Figure 4 Schematic diagram of the structure of the mid-radial section;

[0048] Figure 6 for Figure 1 Partial cross-sectional view.

[0049] In the figure: 1. Cable connector; 2. Motor connector; 3. Cable housing; 4. Cable connection socket; 5. Cable armor hole; 6. Phase mounting hole; 7. Cable; 8. Armor section; 9. Phase section; 10. Upper block; 11. Sealing block; 12. Lower block; 13. Locking screw; 14. Bolt mounting hole; 15. Sealing ring; 16. Sealing gasket; 17. Radial section; 18. Axial oblique section; 19. Stator lead hole; 20. Bolt; 21. Stator lead. DETAILED DESCRIPTION

[0050] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0051] The cable connection device of the utility model is primarily designed for small-diameter submersible motors operating within casings in oil fields. The external dimensions of such small-diameter submersible motors generally cannot exceed 80 mm. When working downhole, it is necessary to connect the surface power supply to the submersible motor via the cable connection device. To accommodate small-diameter submersible motors, existing cable sealing connection devices design the "pin"-shaped three-phase core into a "straight"-shaped three-phase core, ensuring a smaller installation size. However, because the cable connector uses a double-layer shell structure for cable installation, the shell size is relatively large, and the range of smaller installation sizes that can be guaranteed is relatively limited.

[0052] The utility model discloses a cable connection device, the main idea of which is to open a through cable installation hole on the cable housing and the cable connection seat, and divide the cable installation hole into two parts: a cable armor hole and a phase installation hole according to the structure of the cable, thereby making great use of the space of the housing, reducing the size structure of the cable connector, and adopting a straight-line structure to install the cable to ensure a large range of smaller installation dimensions.

[0053] Based on the above conception, the basic scheme of the present utility model is: the cable joint includes a cable housing and a cable connection seat connected to the bottom of the cable housing, a cable installation hole is opened in the cable housing, the cable installation hole is passed through the cable installation hole, the cable installation hole has a cable armor hole for installing the cable armor segment and a phase installation hole for installing three phase segments of the cable, the phase segment is sealed with the phase installation hole through a sealing structure, the cable armor hole is located at the top of the cable housing, and the phase installation hole is opened at the bottom of the cable armor hole and passes through the cable housing and the cable connection seat.

[0054] The following is explained through different embodiments:

[0055] A cable connection device suitable for small diameter submersible motors, such as Figure 1 and Figure 2 As shown, it includes a cable connector 1 and a motor connector 2. The motor connector 2 is cylindrical and has an axial through hole at its center for avoiding the output shaft of the submersible motor. The cable connector 2 includes a cable housing 3 and a cable connection seat 4 connected to the bottom of the cable housing 3. The cable housing 3 and the cable connection seat 4 are an integral stamping structure. The cable connector 2 has good sealing performance due to the integral stamping process. A cable mounting hole is provided in the cable housing 3. The cable mounting hole has a cable armor hole 5 at the top and a phase mounting hole 6 at the bottom of the cable armor hole 5. The phase mounting hole 6 passes through the cable housing 3 and the cable connection seat 4. The cable armor hole 5 is located at the top of the cable housing 3. A through hole is provided at the bottom of the cable armor hole 5 toward the cable connection seat 4. The through hole extends and passes through the cable housing 3 and the cable connection seat 4 to form a phase mounting hole 6. The armored section 8 of the cable is installed in the cable armor hole 5, and the phase section 9 extends into the phase mounting hole 6 and passes through the phase mounting hole 6 to be connected to the stator lead 21 in the motor connector 2. Bolt mounting holes 14 are provided on both sides of the cable connection seat 4 and are connected to the motor connector 2 by bolts 20. By directly designing the cable installation hole on the cable housing to install the cable, the size of the cable connector can be greatly reduced, ensuring a wider range of smaller installation sizes.

[0056] The present invention provides a better embodiment. Figure 3 As shown, the three phase-splitting mounting holes 6 are arranged side by side and equidistantly at the bottom of the cable armor hole 5. That is, the phase-splitting mounting holes are arranged equidistantly in a straight line at the bottom of the cable armor hole 5. In other words, the three phase-splitting segments are arranged in a straight line flat head structure in the cable connector. This flat structure is more space-saving than a round "pin"-shaped structure, which ensures sufficient space on the motor connector to install the cable connector.

[0057] Since the cable connection device of the present application is in a harsh underground environment when in use, it is very important to ensure its sealing so that well fluid and harmful gases cannot enter the submersible motor through the cable connection device to ensure electrical safety. To this end, the present application provides a better embodiment, such as Figure 2As shown, the aperture of the phase-splitting mounting hole 6 is designed to be larger than the diameter of the phase segment of the cable 7. The phase segment is sealed with the phase-splitting mounting hole 6 via a sealing structure. In one embodiment, the sealing structure includes a sealing block 11 and a lower stopper 12, which are sequentially mounted on the phase segment of the cable. The sealing block 11 and the lower stopper 12 are sequentially pressed into the phase-splitting mounting hole via a locking screw 14 and fixed. In this embodiment, the bottom of the phase-splitting mounting hole can be regarded as the upper stopper, so only one stopper and the sealing block are used to seal the gap between the cable and the housing. In another embodiment, the sealing structure also includes an upper stopper 10, which is arranged above the sealing pressure block 11 and contacts the bottom of the phase-splitting mounting hole. That is to say, the sealing structure includes an upper stopper 10, a sealing pressure block 11 and a lower stopper 12 which are sequentially mounted on the phase segment of the cable. The lower stopper 12 is pressed against the axial force by a locking top screw 13 at the outer end of the lower stopper 12. The sealing pressure block 11 is gradually deformed under the action of the axial force to seal the gap between the phase segment and the phase-splitting mounting hole. In this embodiment, the sealing and fixing structure of the cable is designed as a simple sealing pressure block and two stops, which are axially pressed against the gap between the sealed cable and the shell by the locking top screw. The structure is simple and compact, and can ensure good sealing.

[0058] The present invention provides a more optimal embodiment, wherein epoxy resin is poured into the phase-splitting mounting hole 6 to secure the phase segment. The cable mounting hole is sealed and secured by an upper block 10, a sealing block 11, and a lower block 12. There are gaps between these components, which can easily loosen during underground operations. Furthermore, epoxy resin is poured into the phase-splitting mounting hole 6. After solidification, the epoxy resin better secures the cable, preventing it from falling off during operation.

[0059] The present invention provides a better embodiment. Figure 2 As shown, the outer circumference of the locking screw 13 is provided with a sealing ring groove, within which a sealing ring 15 is positioned to radially seal the phase segment. Because the cable connection device of this application is mounted on a submersible motor and operates in the harsh underground environment, its sealing performance is extremely important. Therefore, a radial seal is further provided between the outer circumference of the locking screw 13 and the cable connection base 4 to protect the phase segment of the cable from corrosion by underground oil, thereby extending the service life of the cable connection device.

[0060] The present invention provides a better embodiment. Figure 6As shown, a groove is formed on the bottom end surface of the cable connection base 4, and a sealing gasket 16 is installed in the groove. When the cable connector 1 is installed on the motor connector 2, the cable connector base is installed on the motor connector 2 by bolts. Since the working environment of the cable connection device of this application is relatively harsh, it is very necessary to ensure the overall sealing of the cable connection device of this application when achieving the corresponding function. For this reason, a sealing gasket 16 is provided on the bottom end surface of the cable connection base. When the installed cable connector 1 is fixed to the motor connector 2 by bolts 20, it plays the role of sealing the contact surface between the cable connector 1 and the motor connector 2.

[0061] The present invention provides a better embodiment. Figure 4 and Figure 5 As shown, the motor connector 2 is a cylindrical structure, and its outer wall is provided with a radial section 17 in the radial direction and an axial oblique section 18 in the axial direction. The radial section 17 intersects and is perpendicular to the axial oblique section 18. The motor connector 2 is provided with a stator lead through-hole 19 on the radial section 17, and the stator lead 21 is located in the stator lead through-hole 19. By providing two mutually perpendicular oblique sections on the motor connector and providing a stator lead through-hole 19 on the radial section 17 for installing the stator lead 21, the phase segment on the cable connector 1 is connected to the stator lead 21, and the connection part is wrapped and fixed with insulating tape. The connected cable phase segment and the stator lead are inserted into the stator lead through-hole on the radial section 17 together. At the same time, screw holes are provided on the radial section 17, and the cable connector 1 is fixed to the motor connector 2 by bolts 20 on both sides of the cable connector, thereby achieving communication between the cable and the submersible motor. The cable connector is arranged inside the beveled surface opened by the motor connector, which saves space and helps the cable connection device of the present application to be better suitable for submersible motors with an overall size of less than 80 mm.

[0062] The present invention provides a better embodiment, wherein the outer end surface of the locking screw 13 is provided with a cross groove for easy tool operation. The cross groove is designed on the outer end surface of the locking screw 13, and the locking screw is installed by a corresponding tool, which makes the operation more convenient.

[0063] The present invention provides another technical solution, which is to apply the above cable connection device to a submersible motor. Figure 4 As shown, the submersible motor includes an output shaft, the cable connecting device cooperates with the output shaft through the through hole of the motor connector, and the stator lead passes through the stator lead through-hole on the motor connector and is connected to the phase segment of the cable, thereby realizing the connection between the cable and the submersible motor, so that the power supply on the ground and the submersible motor are connected.

[0064] The present utility model provides another technical solution, which applies the above-mentioned submersible motor to a submersible electric pump. The submersible electric pump includes the above-mentioned submersible motor and a pump body. The submersible motor drives the pump body to operate, so that the submersible electric pump can continuously and reliably extract underground crude oil or well fluid.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A cable connection device, characterized in that: It includes a cable connector and a motor connector. The cable connector includes a cable housing and a cable connection seat connected to the bottom of the cable housing. A cable installation hole is opened in the cable housing, and the cable is passed through the cable installation hole. The cable includes an armored section and three phase sections. The cable installation hole has a cable armor hole for installing the armored section and a phase installation hole for installing the three phase sections. The phase section is sealed with the phase installation hole through a sealing structure. The cable armor hole is located at the top of the cable housing. The phase installation hole is opened at the bottom of the cable armor hole and passes through the cable housing and the cable connection seat. The phase section extends into the phase installation hole and passes through it to be connected to the stator lead in the motor connector. The cable connection seat is sealed with the motor connector.

2. The cable connection device according to claim 1, wherein: The three phase-separation installation holes are arranged side by side and equidistantly at the bottom of the cable armor hole.

3. The cable connection device according to claim 2, wherein: The diameter of the phase-splitting installation hole is larger than the diameter of the phase-splitting section of the cable.

4. The cable connection device according to claim 1, wherein: The sealing structure comprises a sealing pressing block and a lower stopper which are sequentially sleeved on the phase segment of the cable. The sealing pressing block and the lower stopper are sequentially pressed against and pressed into the phase mounting hole by locking top screws for fixation.

5. The cable connection device according to claim 4, wherein: The sealing structure further comprises an upper stopper, which is arranged above the sealing pressing block and contacts the bottom of the phase-splitting mounting hole.

6. The cable connection device according to claim 5, wherein: The phase separation installation hole is filled with epoxy resin to fix the phase separation segment.

7. The cable connection device according to claim 4, wherein: A sealing ring groove is provided on the outer peripheral surface of the locking top screw, and a sealing ring is arranged in the groove to radially seal the phase separation section.

8. The cable connection device according to claim 1, wherein: A groove is provided on the end surface of the bottom of the cable connection seat, and a sealing gasket is installed in the groove.

9. The cable connection device according to claim 8, wherein: Bolt mounting holes are provided on both sides of the cable connection seat, and the motor connector is connected to the cable connection seat by bolts.

10. The cable connection device according to any one of claims 1 to 9, characterized in that: The motor connector is a cylindrical structure, and its outer wall has a radial section along the radial direction and an axial oblique section along the axial direction. The radial section intersects with the axial oblique section and is arranged perpendicularly. The motor connector has a stator lead through-hole at the radial section, and the stator lead is located in the stator lead through-hole.

11. A submersible motor comprising a stator and a cable connection device, characterized in that: The cable connecting device is the cable connecting device according to any one of claims 1 to 10.

12. A submersible electric pump, comprising a pump body and a submersible motor, characterized in that: The submersible motor is the submersible motor according to claim 11.

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