Novel sealing structure of small flat cable head

Abstract

The utility model relates to the technical field of petroleum machinery, in particular to a novel sealing structure of a small flat cable head, which comprises a small flat cable and a casing, the casing is fixedly connected to one side of an electric submersible pump, the small flat cable is mounted inside the casing, and a sealing assembly is arranged inside the casing. The shell and a motor head of the electric submersible pump are mutually fixed through a screw A, and a socket A is fixedly connected in the motor head; the sealing assembly comprises a sealing gasket A, a cushion block A and a cushion block B, the cushion block A and the cushion block B are fixedly connected to the interior of the shell, the cushion block B is arranged on one side of the cushion block A, and the sealing gasket A is arranged on the other side of the cushion block A. The sealing assembly can provide mechanical support for the small flat cable lead, a reliable sealing structure can be formed in the circumferential direction and the axial direction, well liquid and harmful gas can be prevented from entering the electric submersible pump through the small flat cable head, and the sealing effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum machinery, in particular to a novel sealing structure of a small flat cable head. Background Art

[0002] At present, submersible electric pumps are important equipment for oil extraction. Submersible electric pumps are responsible for pumping crude oil or other liquids underground to the surface through pumps. They are one of the key equipment in oil extraction. Submersible motors are installed at the bottom of submersible electric pumps. Their main function is to provide power support and convert electrical energy into mechanical energy to drive submersible electric pumps to lift and transport oil well liquids. A cable connection structure is required to connect the ground power supply to the submersible motor, convert electrical energy into mechanical energy, and provide power support for the submersible electric pump. Because the underground environment is harsh, there are very strict requirements for the mechanical structure and insulation structure of the cable connection structure. The mechanical structure must be easy to install and sealed to prevent well fluid and harmful gases from entering the submersible motor through the cable connection structure to ensure electrical safety.

[0003] However, the sealing connection structure between the existing small flat cable head and the submersible electric pump has poor sealing performance and cannot effectively prevent well fluid or harmful gas from entering the submersible electric pump through the cable connection structure, thereby affecting the normal operation and safety of the equipment. In addition, the flange of the traditional cable connection structure is round. For motors with relatively large outer diameters (>107mm), there is no problem with use and installation. However, for motors with relatively small outer diameters (≤107mm), the round flange will cause the submersible motor to be partially too large, which is not friendly to small-diameter oil wells with long mining time. With the advancement of technology, the power density of the motor is The power is increasing, and under the condition of voltage constraint, the greater the power, the greater the current required, and the current carrying capacity of the cable connection structure is also increasing. However, the external dimensions of the small flat cable head cannot be too large, otherwise it affects the projection size of the entire electric pump. However, the small flat cable head with a circular flange in the prior art has a large structural dimension. During the installation process, the small flat cable head is easily damaged by bumps, which damages the seal of the cable head, causing well fluid to penetrate into the motor, destroying the insulation, and shortening the service life of the electric pump unit. As long as well fluid penetrates into the motor, the motor will soon be damaged due to a short circuit caused by insulation failure, resulting in great economic losses.

[0004] Therefore, a new sealing structure of a small flat cable head is needed to solve the above technical problems. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provides a novel sealing structure for a small flat cable head. The sealing component in the utility model can provide mechanical support for the small flat cable lead and can form a reliable sealing structure from the circumferential and axial directions, thereby preventing well fluid and harmful gases from entering the interior of the submersible electric pump through the small flat cable head, and the sealing effect is good.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a new sealing structure of a small flat cable head, comprising a small flat cable and a shell, wherein the shell is fixedly connected to one side of a submersible electric pump, the small flat cable is installed inside the shell, and a sealing component is arranged inside the shell;

[0007] A flat flange is fixedly connected to one side of the housing, the flange and the motor head of the submersible electric pump are fixed to each other by screws A, and a socket A is fixedly connected inside the motor head;

[0008] The sealing assembly includes a sealing gasket A, a cushion block A and a cushion block B, wherein the cushion block A and the cushion block B are both fixedly connected inside the housing, the cushion block B is arranged on one side of the cushion block A, and the sealing gasket A is arranged on the other side of the cushion block A;

[0009] One end of the small flat cable passes through the sealing pad A, the cushion block A, and the cushion block B from left to right in sequence and is plugged into the socket A of the motor head;

[0010] The outer jacket of the small flat cable is provided with a sealing sleeve A, and the sealing sleeve A is arranged between the cushion block A and the small flat cable.

[0011] Furthermore, a cavity is provided inside the shell, and the cavity is filled with sealant, and the root of the small flat cable is bonded to the shell through the sealant.

[0012] Furthermore, one end of the small flat cable close to the submersible electric pump is fixedly connected with a cable connector, and the cable connector is inserted into the housing and plugged into the motor head of the submersible electric pump.

[0013] Furthermore, the sealing gasket A is any one of a silicone sealing gasket, a sealing lead gasket or a fluororubber sealing gasket.

[0014] Furthermore, the pad A and the pad B are made of the same material, and the pad A and the pad B are both made of any one of polyoxymethylene resin pads or polytetrafluoroethylene pads.

[0015] Furthermore, the sealing sleeve A is any one of a rubber sealing sleeve or a polyurethane sealing sleeve.

[0016] The advantages of the utility model are: the utility model provides a new sealing structure of a small flat cable head, which has the following technical effects:

[0017] 1. The small flat cable in the utility model is installed inside the shell, and a sealing assembly is arranged inside the shell. The sealing assembly includes a sealing gasket A, a cushion block A and a cushion block B. The sealing assembly can provide mechanical support for the small flat cable lead and can form a reliable sealing structure from the circumferential and axial directions, which can prevent well fluid and harmful gases from entering the submersible electric pump through the small flat cable head, and the sealing effect is good.

[0018] 2. Compared with the conventional small flat cable head structure, the utility model is more suitable for use in small well diameters. The flange in the utility model is a flat structure. The small flat cable head is not easily damaged by bumps during installation. At present, the projection size of the conventional small flat cable head structure is about 115mm, and the projection size of the new cable connection structure is only 107mm. For small-diameter oil wells buried thousands of meters underground, especially inclined wells, the larger the projection size, the greater the installation difficulty. Taking the well diameter of 5.5 inches as an example, when installing a motor with an outer diameter of 107mm, the conventional small flat cable head structure has a larger size. During installation, the small flat cable head is easily damaged by bumps, which damages the seal of the cable head, causes well fluid to penetrate into the motor, destroys insulation, and shortens the service life of the electric pump unit. As long as well fluid penetrates into the motor, the motor will soon be damaged due to short circuit caused by insulation failure, causing great economic losses. The new cable connection structure of the utility model solves this problem well, so that the unit can achieve a reasonable service life and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the small flat cable and the submersible electric pump in the connected state;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 3 This is a schematic diagram of the assembly structure of the small flat cable in the transportation state;

[0023] Figure 4 for Figure 3 A schematic cross-sectional structure diagram of ;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the submersible electric pump in the transportation state;

[0025] Figure 6 It is a structural schematic diagram of the flange in the utility model;

[0026] in:

[0027] 1. Small flat cable; 101. Cable connector; 2. Housing;

[0028] 201, cavity; 3, submersible electric pump; 301, motor head;

[0029] 302. Socket A; 4. Screw A; 5. Sealing gasket A;

[0030] 6. Pad A; 7. Sealing sleeve A; 8. Pad B;

[0031] 9. Flange; 10. Transport cap; 11. Screw B;

[0032] 12. Nut A; 13. Sealing gasket B; 14. Spacer C;

[0033] 15. Sealing sleeve B; 16. Socket B; 17. Sealing gasket C;

[0034] 18. Pad D; 19. Transport cover; 20. Sealing ring. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. The terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] Embodiment 1:

[0038] Figure 1 This is a cross-sectional view of the small flat cable connected to the submersible electric pump. Figure 2 for Figure 1 The enlarged structural diagram at A in the middle, Figure 6 It is a schematic diagram of the structure of the flange in the utility model, such as Figure 1 , Figure 2 and Figure 6 A new sealing structure of a small flat cable head is shown, comprising a small flat cable 1 and a shell 2, wherein the shell 2 is fixedly connected to one side of a submersible electric pump 3, and the small flat cable 1 is installed inside the shell 2, wherein a sealing assembly is arranged inside the shell 2, and the sealing assembly in the utility model comprises a sealing gasket A5, a pad A6 and a pad B8, and the sealing gasket A5 adopts a sealing lead gasket, which can fill and compensate for the uneven surface between the seals to a certain extent, provide a better sealing effect, and reduce the possibility of well fluid infiltration, and the sealing lead gasket has good plasticity and deformation ability, and can withstand a large pressure to a certain extent, thereby ensuring the stability of the seal under high pressure environment.

[0039] The pad A6 and the pad B8 in the present invention are both fixedly connected to the inside of the housing 2, and the pad B8 is arranged on one side of the pad A6. The pad A6 and the pad B8 are made of the same material. The pad A6 and the pad B8 are both polyoxymethylene resin pads. The main function of the pad A6 and the pad B8 is to provide a stable mechanical support for the lead of the small flat cable 1 to prevent the cable from shaking or loosening during installation and use. In addition, the arrangement of the pad A6 and the pad B8 can fill the gap between the inside of the housing 2 and the small flat cable 1, ensuring that the sealing component is tightly fixed in a suitable position as a whole, which helps to form a reliable sealing structure. The sealing pad A5 in the present invention is arranged on the other side of the pad A6, and one end of the small flat cable 1 is from left to right. It passes through the sealing pad A5, the cushion block A6, the cushion block B8 in sequence and is plugged into the socket A302 of the motor head 301. The utility model provides a sealing sleeve A7 on the outer sleeve of the small flat cable 1. The sealing sleeve A7 is arranged between the cushion block A6 and the small flat cable 1. The sealing sleeve A7 adopts a rubber sealing sleeve, and its main function is to provide effective sealing protection for the small flat cable 1 to prevent liquid, gas or other impurities from entering the sealing structure and maintain the sealing performance. At the same time, the rubber sealing sleeve has certain elasticity and softness, which can play a role of buffering and shock absorption, reduce the influence of external vibration on the sealing structure, and the rubber sealing sleeve can also play a certain insulating role to protect the small flat cable 1 from electrical interference from the external environment, thereby improving safety and stability.

[0040] The utility model has a cavity 201 opened inside the shell 2, and the cavity 201 is filled with sealant. The root of the small flat cable 1 is bonded to the shell 2 through the sealant; the sealing component can provide mechanical support for the lead of the small flat cable 1, and can form a reliable sealing structure from the circumferential and axial directions, which can prevent well fluid and harmful gases from entering the submersible electric pump 3 through the head of the small flat cable 1.

[0041] In the utility model, a flat flange 9 is fixedly connected to one side of the housing 2, and the flange 9 and the motor head 301 of the submersible electric pump 3 are fixed to each other by screws A4. The flange 9 is designed as a flat structure, and compared with the traditional round flange 9, the installation size of the small flat cable 1 can be reduced, and the head of the small flat cable 1 is not easily damaged by bumps during the installation process. Figure 5 As shown, when the submersible electric pump 3 is in the transport state, the socket A302 is sealed by the transport cover 19.

[0042] The utility model is provided with a cable connector 101 fixedly connected to one end of the small flat cable 1 close to the submersible electric pump 3. The cable connector 101 is inserted into the housing 2 and plugged into the motor head 301 of the submersible electric pump 3. The cable connector 101 can realize a reliable connection between the small flat cable 1 and the lead-out line of the submersible motor, thereby providing an energy channel for the submersible motor.

[0043] Embodiment 2:

[0044] Figure 3 is a schematic diagram of the assembly structure of the small flat cable 1 in the transportation state, Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure, Figure 6 It is a schematic diagram of the structure of the flange 9 in the utility model, as shown in FIG. Figure 3 , Figure 4 and Figure 6 A novel sealing structure of a small flat cable head is shown, comprising a small flat cable 1 and a shell 2, wherein a cavity 201 is opened inside the shell 2, and the cavity 201 is filled with sealant, and the root of the small flat cable 1 is bonded to the shell 2 by the sealant, and a flange 9 is fixedly connected to one side of the shell 2, and a transport cap 10 is arranged on one side of the flange 9 to provide protection for the small flat cable 1 during transportation, and a plurality of sockets B16 are fixedly connected to the inner wall of the transport cap 10, and the flange 9 and the transport cap 10 are connected to each other by screws B11, and the screws B11 are fastened by nuts A12, and the small flat cable 1 is installed inside the shell 2.

[0045] The utility model is provided with a sealing component inside the housing 2. The sealing component in Example 2 of the utility model includes a sealing pad B13, a sealing pad C17, a sealing ring 20, a pad C14 and a pad D18. The sealing pad B13 and the sealing pad C17 are both made of fluororubber sealing pads. The functions of the sealing pad C17 and the sealing ring 20 are to ensure that the small flat cable 1 can provide effective sealing during transportation. The pad C14 and the pad D18 are both fixedly connected to the inside of the housing 2. The pad D18 is arranged on one side of the pad C14. The material of the pad C14 and the pad D18 is the same. The pad C14 and the pad D18 are both made of polytetrafluoroethylene pads, which can enhance the structural stability and play a positioning role for the small flat cable 1.

[0046] In the utility model, the sealing gasket B13 is arranged on the other side of the cushion block C14, and the sealing gasket C17 and the sealing ring 20 are both installed between the flange 9 and the transport cap 10. The sealing ring 20 can provide additional sealing support to help ensure the sealing performance of the entire sealing assembly. One end of the small flat cable 1 passes through the sealing gasket B13, the cushion block C14, the cushion block D18, the flange 9 from left to right in sequence and is plugged into the socket B16 of the transport cap 10. Specifically, in the utility model, the small flat cable 1 is fixedly connected with a cable connector 101 at one end close to the transport cap 10. The cable connector 101 is inserted into the shell 2 and is plugged into the socket B16. In the utility model, a sealing sleeve B15 is provided on the outer sleeve of the small flat cable 1. The sealing sleeve B15 is arranged between the cushion block C14 and the small flat cable 1. The sealing sleeve B15 adopts a polyurethane sealing sleeve, which can provide additional sealing support and can effectively prevent moisture, dust or other impurities from entering during the transportation of the small flat cable 1.

[0047] To sum up, the new small-well diameter cable connection structure provided by the utility model is compact and has good sealing performance. The research and development of this structure provides a reliable connection between smaller outer diameter submersible motors and ground power supplies. The connection method is plug-in, and the installation is convenient and quick. Moreover, the small-well diameter cable connection structure provided by the utility model can shrink the size of the smaller outer diameter series submersible motors within the outer diameter of the motor, which is more friendly to oil wells with smaller well diameters. The new small-well diameter cable connection structure suitable for submersible motors with an outer diameter of about 107mm can meet the requirements of 13 square cables, and the new small-well diameter cable connection structure suitable for submersible motors with an outer diameter of 86mm can meet the requirements of 10 square cables, laying a foundation for improving the power density of small outer diameter series submersible motors, and has a relatively broad application prospect.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A novel sealing structure of a small flat cable head, comprising a small flat cable (1) and a housing (2), wherein the housing (2) is fixedly connected to one side of a submersible electric pump (3), the small flat cable (1) is installed inside the housing (2), and a sealing component is arranged inside the housing (2); It is characterized in that A flat flange (9) is fixedly connected to one side of the housing (2); the flange (9) and the motor head (301) of the submersible electric pump (3) are fixed to each other via screws A (4); and a socket A (302) is fixedly connected inside the motor head (301); The sealing assembly comprises a sealing gasket A (5), a cushion block A (6) and a cushion block B (8), wherein the cushion block A (6) and the cushion block B (8) are both fixedly connected to the inside of the housing (2), the cushion block B (8) is arranged on one side of the cushion block A (6), and the sealing gasket A (5) is arranged on the other side of the cushion block A (6); One end of the small flat cable (1) passes through the sealing pad A (5), the cushion block A (6), and the cushion block B (8) from left to right in sequence and is plugged into the socket A (302) of the motor head (301); The outer jacket of the small flat cable (1) is provided with a sealing sleeve A (7), and the sealing sleeve A (7) is arranged between the cushion block A (6) and the small flat cable (1).

2. A new sealing structure for a small flat cable head according to claim 1, characterized in that: The shell (2) has a cavity (201) formed inside, the cavity (201) is filled with sealant, and the root of the small flat cable (1) is bonded to the shell (2) by the sealant.

3. A new sealing structure for a small flat cable head according to claim 1, characterized in that: One end of the small flat cable (1) close to the submersible electric pump (3) is fixedly connected to a cable connector (101), and the cable connector (101) is inserted into the housing (2) and plugged into the motor head (301) of the submersible electric pump (3).

4. A new sealing structure for a small flat cable head according to claim 1, characterized in that: The sealing gasket A (5) is any one of a silicone sealing gasket, a sealing lead gasket or a fluororubber sealing gasket.

5. The novel sealing structure of a small flat cable head according to claim 1 is characterized in that: The cushion block A (6) and the cushion block B (8) are made of the same material. The cushion block A (6) and the cushion block B (8) are both made of either a polyoxymethylene resin cushion block or a polytetrafluoroethylene cushion block.

6. A new sealing structure for a small flat cable head according to claim 1, characterized in that: The sealing sleeve A (7) is a rubber sealing sleeve or a polyurethane sealing sleeve.

Images