Motor outgoing line and cable connecting structure of submersible linear motor

Abstract

The utility model discloses a motor outgoing line and cable connecting structure of a submersible linear motor. The motor outgoing line and cable connecting structure comprises a motor outgoing line, a cable and a cable fixing clamp, the motor leading-out wire comprises a cable and a metal shell arranged outside the cable in a sleeving mode, and a conical surface is arranged in the middle of the metal shell and is in taper fit with the end of the motor. The motor outgoing line is fixedly connected with the cable, a fluorinated ethylene propylene strip is fixedly wound at the joint of the copper wires, a polytetrafluoroethylene strip is wound between the motor outgoing line and the cable, and the wound part of the polytetrafluoroethylene strip is heated; the cable fixing clamp comprises a split-phase cable fixing clamp and a submersible cable fixing clamp, and the split-phase cable fixing clamp and the submersible cable fixing clamp are of a Haver type structure. According to the connecting structure, the sealing performance and the stability of the motor outgoing line and the cable of the submersible linear motor are improved, and the radial size of the whole motor is also reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor wire fixing technology, and more specifically, to a connection structure between the motor lead wire and cable of a submersible linear motor. Background Technology

[0002] Submersible motors operate in high-temperature, high-pressure, and highly corrosive downhole environments, presenting severe challenges to the robustness, sealing, and weather resistance of the motor leads and cables. During well entry and exit and operation, the cable joints are subjected to external impacts, all of which challenge the stable operation of the submersible pump. Furthermore, due to the limited projected diameter of the tubing and motor, the dimensions of the cable joints must be strictly controlled. As a critical component connecting the submersible motor and cable, the submersible cable joint is the weakest point in the electrical and mechanical structure of the entire submersible pump system; its insulation, sealing, and robustness directly affect the reliability of the submersible pump.

[0003] Currently, it is difficult to balance the requirements of insulation, sealing, and mechanical strength in the motor leads and cables of submersible pumps. Most submersible cables are connected by manual crimping and wrapping. The cable sheath used outside the insulation layer has limited sealing performance and poor resistance to external impact. After long-term operation downhole, well fluid will seep into the gap between the sheath and the joint insulation, affecting the cable insulation quality and reducing the service life of the submersible pump.

[0004] Utility model CN205304204U discloses a submersible cable connection device, comprising: a cable connector, which is hollow and cylindrical, for fitting onto the outside of a set of submersible cable cores to be connected; a sealing sleeve, which is hollow and cylindrical, fitted onto the outside of the cable connector, the length of the sealing sleeve being greater than the length of the cable connector; a crimping member, comprising a first crimping block and a second crimping block, the first crimping block and the second crimping block mating to form at least one first hole, the first hole being for engaging with the submersible cable core, the cross-sectional area of ​​the first hole being smaller than the cross-sectional area of ​​the submersible cable core; and a limiting pressure block, comprising a first pressure block and a second pressure block, the first pressure block and the second pressure block mating to form at least one second hole, the second hole being for engaging with the insulation layer of the submersible cable. The device has a certain sealing and tensile strength, but it has high requirements for the processing accuracy and assembly ability of the cable joint and sealing sleeve. At the same time, the sealing performance of the cable joint is achieved by interference fit between mechanical parts, and the sealing effect will drop rapidly after long-term operation in the well and subjected to various impacts. The cable joint solution seals three-phase cables at the same time, which takes up too much volume and can easily affect the normal operation of other components in the well. Moreover, it is not suitable for connecting and fixing cables and motor leads. Summary of the Invention

[0005] To address the problems of the prior art, this invention provides a connection structure for the motor lead wire and cable of a submersible linear motor.

[0006] The technical solution adopted in this utility model is:

[0007] This utility model provides a connection structure for the motor lead wire and cable of a submersible linear motor, including a motor lead wire, a cable, and a cable fixing clamp. The motor lead wire includes a cable and a metal shell sleeved over the cable. The metal shell has a tapered surface in the middle, which matches the tapered end of the motor. The motor lead wire is fixedly connected to the cable. Fluoroplastic tape is fixedly wrapped around the copper wire connection, and polytetrafluoroethylene tape is wrapped between the motor lead wire and the cable. The wrapping of the polytetrafluoroethylene tape is heat-treated. The cable fixing clamp includes a phase cable fixing clamp and a submersible cable fixing clamp, and the phase cable fixing clamp and the submersible cable fixing clamp are of the Haver type structure.

[0008] Furthermore, the phase cable fixing clamp includes a cable fixing outer clamp, a cable fixing inner clamp fixed on the cable fixing outer clamp, and a locking inner clamp. The cable fixing outer clamp is provided with an outer clamping arc, and the cable fixing inner clamp is provided with an inner clamping arc. Anti-slip pads are provided on the outer clamping arc and the inner clamping arc.

[0009] Furthermore, the submersible cable fixing clamp includes an upper clamping cuff and a lower clamping cuff, which are fixedly connected. The upper clamping cuff has a submersible cable fixing groove, and an anti-slip pad is adhered to the fixing groove.

[0010] Furthermore, the anti-slip pad is made of rubber.

[0011] Furthermore, the cable and its outer metal casing are interference-fitted using a cold-drawing process.

[0012] Furthermore, the metal casing is made of stainless steel and is connected to the motor end by welding.

[0013] Furthermore, the fluoroplastic tape is a perfluoroethylene propylene tape; the heat treatment temperature is 180-210℃, and the heating time is 8-10 minutes.

[0014] Furthermore, the motor lead wire and the cable are fixedly connected by induction welding or crimping of copper sleeves or copper core plugs.

[0015] Furthermore, multiple sets of the cable fixing clamps can be provided.

[0016] Furthermore, the angle of the tapered fit is 30 to 60°.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention enhances the sealing performance of the motor leads by welding and pressure sealing them to the motor end through a tapered surface fit, and also reduces the radial dimension of the entire motor.

[0019] This invention uses a special insulating tape and a high-temperature fusion process at the connection between the motor lead wire and the cable, so that the insulating wrapping layer on the wire core can simultaneously achieve the effects of insulation and sealing. The structure is simple, reliable, and highly stable, and is convenient for assembly and repair in the harsh field environment of oil fields.

[0020] This utility model uses a Haval-style cable clamp to simultaneously position and fix the three-phase cable and the submersible motor cable, reducing the impact of axial vibration during submersible motor operation on the cable connection and reducing the projected outer diameter of the submersible motor cable. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure for connecting the motor leads and cable of a submersible linear motor.

[0022] Figure 2 This is a schematic diagram of a submersible linear motor structure;

[0023] Figure 3 This is a schematic diagram of the phase-separation cable fixing clamp structure;

[0024] Figure 4 Schematic diagram of the submersible cable fixing clamp structure;

[0025] Figure 5 This is a schematic diagram of the connection between the motor lead wire and the cable.

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the motor end;

[0027] Figure 7 This is a schematic diagram of the cross-section of the motor end;

[0028] Figure 8 A schematic diagram of the motor lead wire structure;

[0029] Figure 9 This is a schematic diagram of the connection structure between the motor lead wires and the motor end.

[0030] The components include: 1. Motor end; 101. Motor end conical surface; 2. Motor connecting sleeve; 3. Motor connecting pipe; 4. Motor lead wire; 401. Stainless steel outer shell conical surface; 402. Stainless steel outer shell; 403. Cable; 5. Phase cable fixing clamp; 6. Submersible cable fixing clamp; 7. Cable; 8. Cable fixing outer clamp; 801. Outer clamp arc; 9. Cable fixing inner clamp; 901. Inner clamp arc; 10. Locking inner clamp; 11. Upper lobe of cable fixing clamp; 111. Submersible cable fixing slot; 12. Lower lobe of cable fixing clamp; 13. Poly(fluoroethylene) propylene strip; 14. Polytetrafluoroethylene strip. Detailed Implementation

[0031] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, "on" or "below" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0032] Example 1

[0033] Please see Figures 1 to 9This utility model provides an embodiment of a connection structure between a submersible linear motor lead wire 4 and a cable 7, comprising a motor lead wire 4, a cable 7, and a cable fixing clamp; the motor lead wire 7 includes a cable 403 and a stainless steel outer shell 402 sleeved on the cable, the stainless steel outer shell 402 having a stainless steel outer shell conical surface 401 in the middle, which matches the taper of the motor end; the motor lead wire 4 and the cable 7 are fixedly connected, with fluoropolymer tape fixedly wound at the copper wire connection point, and polytetrafluoroethylene tape wound between the motor lead wire and the cable, the PTFE tape wound point being heat-treated; the cable fixing clamp includes a phase cable fixing clamp 5 and a submersible cable fixing clamp 6, the phase cable fixing clamp 5 and the submersible cable fixing clamp 6 being a Haver-type structure.

[0034] like Figure 2 As shown, a certain submersible linear motor includes a motor end 1, a motor connecting sleeve 2, a motor connecting pipe 3, and a motor lead wire 4; the motor end 1 is as follows: Figure 6 , Figure 7 As shown, the overall structure is a hollow tube, with the center hollowed out to accommodate the mover of the submersible linear motor. Therefore, the space on both sides is very limited. To enhance the sealing effect with the motor lead wire 4 within the limited volume, a conical surface 101 is designed at the motor end. The structure of the motor lead wire is as follows: Figure 8 As shown, the cable 43 is encased in a stainless steel shell 402. The stainless steel shell 402 is tightly fitted onto the cable 403 by a cold drawing process. The stainless steel shell 402 is also designed with a corresponding stainless steel shell conical surface 401. The 30° taper angle facilitates a sealing effect with the motor end.

[0035] The phase-separated cable fixing clamp 6 includes an outer cable fixing clamp 8, an inner cable fixing clamp 9 fixed on the outer cable fixing clamp 8, and a locking inner clamp 10. The outer cable fixing clamp 8 has an outer clamping arc 801, and the inner cable fixing clamp 9 has an inner clamping arc 901. Anti-slip pads are provided on the outer clamping arc 801 and the inner clamping arc 901. The submerged cable fixing clamp 6 includes an upper cable fixing clamp 11 and a lower cable fixing clamp 12, which are fixedly connected. The upper cable fixing clamp 11 has a submerged cable fixing groove 111, and an anti-slip pad is adhered to the fixing groove. The anti-slip pad can enhance friction and enhance the cable clamping effect.

[0036] The structure at the connection between motor lead 4 and cable 7 is as follows: Figure 5As shown, the copper cores of the motor lead wire 4 and the cable 7 are first welded together by induction welding. Then, a ring of insulation is wrapped around the exposed copper core using polytetrafluoroethylene tape 13 with special adhesive backing. After that, a polytetrafluoroethylene tape 14 with special adhesive backing is used to seal the outer layer. After wrapping, the heat treatment temperature is 180°C and the heating time is 8 minutes to make the tape integrally formed, which enhances the insulation, sealing and mechanical properties.

[0037] The structure of motor end 1 is as follows Figure 6 Figure 7 As shown, the overall structure is a hollow tube, with the center hollowed out to accommodate the mover of the submersible linear motor. Therefore, the space on both sides is very limited. To enhance the sealing effect with the motor lead wires within the limited volume, a conical surface 101 was designed. The structure of the motor lead wire 4 is as follows... Figure 8 As shown, the cable is encased in a stainless steel shell 402. The stainless steel shell 402 is tightly fitted onto the cable using a cold-drawing process. A corresponding stainless steel conical surface 401 is also designed on the stainless steel shell 402, achieving a sealed fit through a 30° taper angle. The overall installation structure of the motor lead wire is as follows. Figure 9 As shown, during installation, the motor lead wire 4 is pushed into one side of the large hole at the motor end 1. While continuously applying pressure, the stainless steel shell 402 of the motor lead wire 4 is welded to both ends of the motor end 1 to ensure the sealing of the lead wire structure and reduce the radial dimension of the entire motor.

[0038] Example 2

[0039] Please see Figures 1 to 9 This utility model provides an embodiment of a connection structure between a submersible linear motor lead wire 4 and a cable 7, comprising a motor lead wire 4, a cable 7, and a cable fixing clamp; the motor lead wire 7 includes a cable 403 and a stainless steel outer shell 402 sleeved on the cable, the stainless steel outer shell 402 having a stainless steel outer shell conical surface 401 in the middle, which matches the taper of the motor end; the motor lead wire 4 and the cable 7 are fixedly connected, with fluoropolymer tape fixedly wound at the copper wire connection point, and polytetrafluoroethylene tape wound between the motor lead wire and the cable, the PTFE tape wound point being heat-treated; the cable fixing clamp includes a phase cable fixing clamp 5 and a submersible cable fixing clamp 6, the phase cable fixing clamp 5 and the submersible cable fixing clamp 6 being a Haver-type structure.

[0040] like Figure 2 As shown, a certain submersible linear motor includes a motor end 1, a motor connecting sleeve 2, a motor connecting pipe 3, and a motor lead wire 4; the motor end 1 is as follows: Figure 6 , Figure 7As shown, the overall structure is a hollow tube, with the center hollowed out to accommodate the mover of the submersible linear motor. Therefore, the space on both sides is very limited. To enhance the sealing effect with the motor lead wire 4 within the limited volume, a conical surface 101 is designed at the motor end. The structure of the motor lead wire is as follows: Figure 8 As shown, the cable 43 is encased in a stainless steel shell 402. The stainless steel shell 402 is tightly fitted onto the cable 403 by a cold drawing process. The stainless steel shell 402 is also designed with a corresponding stainless steel shell conical surface 401. The 30° taper angle facilitates a sealing effect with the motor end.

[0041] The phase-separated cable fixing clamp 6 includes an outer cable fixing clamp 8, an inner cable fixing clamp 9 fixed on the outer cable fixing clamp 8, and a locking inner clamp 10; the outer cable fixing clamp 8 has an outer clamping arc 801, and the inner cable fixing clamp 9 has an inner clamping arc 901; the submerged cable fixing clamp 6 includes an upper cable fixing clamp 11 and a lower cable fixing clamp 12, which are fixedly connected; the upper cable fixing clamp 11 has a submerged cable fixing slot 111, and the phase-separated cable is fixed in the phase-separated cable fixing clamp 6 to prevent the cable from vibrating and shifting.

[0042] Furthermore, the outer clamping arc 801 and the inner clamping arc 901 are provided with anti-slip pads, and the fixing groove 111 is bonded with anti-slip pads. These anti-slip pads can enhance friction and improve the cable clamping effect.

[0043] The structure at the connection between motor lead 4 and cable 7 is as follows: Figure 5 As shown, the copper cores of the motor lead wire 4 and the cable 7 are first connected by crimping copper sleeves. Then, a ring of insulation is wrapped around the exposed copper core using polytetrafluoroethylene tape 13 with special adhesive backing. After that, a polytetrafluoroethylene tape 14 with special adhesive backing is used for sealing wrapping on the outer layer. After wrapping, the heat treatment temperature is 210°C and the heating time is 10 minutes to make the tape integrally formed, enhancing the insulation, sealing and mechanical properties.

[0044] The structure of motor end 1 is as follows Figure 6 Figure 7 As shown, the overall structure is a hollow tube, with the center hollowed out to accommodate the mover of the submersible linear motor. Therefore, the space on both sides is very limited. To enhance the sealing effect with the motor lead wires within the limited volume, a conical surface 101 was designed. The structure of the motor lead wire 4 is as follows... Figure 8 As shown, the cable is encased in a stainless steel shell 402. The stainless steel shell 402 is tightly fitted onto the cable using a cold-drawing process. A corresponding stainless steel conical surface 401 is also designed on the stainless steel shell 402, achieving a sealed fit through a 60° taper angle. The overall installation structure of the motor lead wire is as follows. Figure 9As shown, during installation, the motor lead wire 4 is pushed into one side of the large hole at the motor end 1. While continuously applying pressure, the stainless steel shell 402 of the motor lead wire 4 is welded to both ends of the motor end 1 to ensure the sealing of the lead wire structure and reduce the radial dimension of the entire motor.

[0045] Example 3

[0046] Unlike Embodiment 2, in this embodiment, the copper cores of the motor lead 4 and the cable 7 are fixedly connected by a copper core plug. Furthermore, considering the relatively long length of the submersible linear motor, resulting in a long cable path on the motor body, multiple sets of cable clamps can be used to secure the cable.

[0047] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A connection structure between the motor lead wire and cable of a submersible linear motor, characterized in that: The system includes a motor lead wire, a cable, and a cable clamp. The motor lead wire includes a cable and a metal outer shell. The metal outer shell has a tapered surface in the middle, which matches the tapered end of the motor. The motor lead wire is fixedly connected to the cable. Fluoroplastic tape is fixedly wrapped around the copper wire connection. Polytetrafluoroethylene (PTFE) tape is then wrapped between the motor lead wire and the cable. The PTFE tape wrapping is heat-treated. The cable clamp includes a phase cable clamp and a submersible cable clamp, both of which are Haver-type structures.

2. The connection structure between the lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The phase-separated cable fixing clamp includes an outer cable fixing clamp, an inner cable fixing clamp fixed on the outer cable fixing clamp, and a locking inner clamp. The outer cable fixing clamp has an outer clamping arc, and the inner cable fixing clamp has an inner clamping arc. Anti-slip pads are provided on the outer clamping arc and the inner clamping arc.

3. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The submersible cable fixing clamp includes an upper clamp and a lower clamp, which are fixedly connected. The upper clamp has a submersible cable fixing groove, and an anti-slip pad is glued to the fixing groove.

4. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 3, characterized in that: The anti-slip pad is made of rubber.

5. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The cable and its outer metal casing are interference-fitted by a cold-drawing process.

6. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The metal casing is made of stainless steel and is connected to the motor end by welding.

7. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The fluoroplastic tape is a perfluoroethylene propylene tape; the heat treatment temperature is 180-210℃, and the heating time is 8-10 minutes.

8. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The motor lead wires and cables are fixedly connected by induction welding or crimping copper sleeves or copper core plugs.

9. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: Multiple sets of the cable clamps can be installed.

10. The connection structure between the motor lead wire and cable of a submersible linear motor according to claim 1, characterized in that: The angle of the taper fit is 30 to 60°.

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