Electric submersible pump unit

Abstract

The invention relates to the technical field of electric submersible pumps, in particular to an electric submersible pump unit. Comprising a mounting frame; the shell is arranged on the mounting frame; the connecting pipe is fixedly connected to the upper side of the mounting frame; the connecting shaft is rotationally connected to the mounting frame, and the connecting shaft is fixedly connected with an output shaft of a submersible motor; the plurality of connecting shells are arranged in a linear array and are connected to the connecting shaft in a sliding and rotating manner; the number of the impellers is consistent with that of the connecting shells, and the impellers are rotationally connected to the connecting shaft; the number of the fixing rings and the number of the positioning rings are consistent with the number of the connecting shells, and the fixing rings and the positioning rings are fixedly connected to the mounting frame. After a certain impeller is clamped by sand, the connection mode of the corresponding connection shell and the connection shaft is changed, automatic separation of the clamped impeller is achieved, meanwhile, after the clamped impeller is separated, the submersible motor normally drives the other impellers, and therefore it is guaranteed that the other impellers can normally transmit well fluid, and meanwhile the probability that the motor is burnt down is reduced.

Description

Technical Field

[0001] This invention relates to the field of submersible electric pump technology, and more particularly to a submersible electric pump unit. Background Technology

[0002] As a core piece of equipment for efficient oilfield development, the submersible electric pump (SAEP) mainly consists of four core components: a multi-stage centrifugal pump, a protector, an oil-gas separator, and a submersible motor. (The protector is mainly used to compensate for changes in the volume of lubricating oil inside the submersible motor. Simultaneously, during the flow of the lubricating oil, the flowing lubricating oil carries away the heat generated during the movement of the submersible motor, thus maintaining the SAEP's normal operation at high temperatures.) During operation, the submersible motor drives the impeller of the multi-stage centrifugal pump to rotate at high speed. The centrifugal force generated by the impeller during rotation lifts the crude oil from the well to the surface. Therefore, the SAEP plays an irreplaceable role in oilfield extraction. However, during the extraction of sandy formations, formation sand particles continuously enter the pump body along with crude oil. Some of the sand particles entering the pump body move upwards synchronously with the crude oil, while others enter the gap between the impeller and the pump casing and become stuck in the gap. Simultaneously, with the continuous rotation of the impeller, the impeller drives the sand particles to rotate synchronously, which generates hard friction on the inner wall of the pump casing. This increases the rotational torque of the impeller and also damages the inner wall of the pump casing. After the inner wall of the pump casing is damaged, the shape of the gap between the impeller and the pump casing changes, making it easier for the sand particles that have entered the gap to "lock" in that position, ultimately leading to mechanical jamming. This increases the risk of motor overload, causing the motor to fail to operate normally and reducing the efficiency of crude oil extraction. Summary of the Invention

[0003] In order to overcome the shortcomings of existing submersible electric pumps during use, the present invention provides a submersible electric pump unit.

[0004] The technical solution is as follows: A submersible electric pump unit, comprising: The mounting frame has a separator, a protector, a submersible motor, and a stabilizer arranged sequentially from top to bottom on its lower side. A housing is disposed on the mounting frame, and the housing and the mounting frame together form a liquid storage cavity; A connecting pipe is fixed to the upper side of the mounting bracket and communicates with the liquid storage chamber of the outer shell; A connecting shaft is rotatably connected to the mounting bracket, and the connecting shaft is fixedly connected to the output shaft of the submersible motor; The connecting shell has multiple shells arranged in a linear array, all of which are slidably and rotatably connected to the connecting shaft; The number of impellers is the same as the number of connecting shells, and they are all rotatably connected to the connecting shaft. The impellers are slidably connected to the corresponding connecting shells. The number of fixed rings and positioning rings is the same as the number of connecting shells. Both are fixed to the mounting frame, and both the fixed rings and positioning rings are rotatably connected to the corresponding impellers. The number of connecting components is the same as the number of connecting shells, and they are all disposed on the connecting shaft. The connecting components are used to change the relative position of the corresponding connecting shell and the connecting shaft.

[0005] Preferably, the connection component includes: Two symmetrically distributed limiting pins are slidably connected to the connecting shaft. A first spring is fixed between the connecting shaft and the limiting pins. The connecting shell is provided with symmetrically distributed limiting slots. The limiting pins are located in adjacent limiting slots on the corresponding connecting shell. The second spring is fixed between the connecting shell and the corresponding impeller.

[0006] Preferably, the limiting pin is composed of a hemisphere and a cylinder, and the height of the limiting groove on the connecting shell is less than the diameter of the limiting pin hemisphere.

[0007] Preferably, the spring constant of the first spring is greater than that of the second spring.

[0008] As a preferred option, it also includes: A braking assembly, the number of which is the same as the number of impellers, is disposed on the connecting shaft. The braking assembly is used to increase the resistance to the rotation of the impeller when the corresponding impeller is stuck. The braking assembly includes: The mounting housing is rotatably connected to the connecting shaft, and the mounting housing is fixedly connected to the corresponding retaining ring. The movable block is slidably connected within the mounting housing; A friction block is fixed to the lower side of the movable block, and the friction block is used to increase the resistance to the rotation of the impeller; A movable ring is rotatably connected to the upper side of the corresponding connecting shell. The movable ring is located inside the mounting shell, and the inner diameter of the movable ring is larger than the diameter of the connecting shaft. A movable rod is fixed to the movable ring on the side near the movable block. The movable block is provided with an inclined groove for the movable rod to slide. The lower side of the connecting shell is provided with an inclined ring surface for pressing the corresponding limiting pin.

[0009] Preferably, the friction block consists of a connecting part and a deformable part, the connecting part of the friction block is fixedly connected to the moving block, and the deformable part of the friction block is used to contact the impeller.

[0010] As a preferred option, it also includes: The number of extrusion blocks is the same as the number of mounting shells, and they are slidably connected to the corresponding mounting shells. The outer shell is slidably connected to the mounting bracket and the connecting pipe, and the outer shell and the connecting pipe together form a storage cavity. A third spring is provided between the extrusion block and the corresponding mounting shell, and the extrusion block is provided with a limit groove. The number of positioning blocks is the same as the number of mounting shells, and they are fixed to the corresponding moving rings. The positioning blocks slide within the limiting grooves.

[0011] Preferably, the limiting groove is composed of a horizontal part, a vertical part and an inclined part, and the three parts of the same limiting groove are connected in pairs.

[0012] Preferably, a first intercepting block and a second intercepting block are rotatably connected within the limiting groove. The first intercepting block is located at the junction of the inclined portion and the vertical portion of the limiting groove, and the second intercepting block is located at the junction of the inclined portion and the horizontal portion of the limiting groove. Both the first and second intercepting blocks are provided with torsion springs between themselves and the extrusion block.

[0013] Preferably, the positioning block is composed of a horizontal block and a cylinder, and the lengths of the first intercepting block and the second intercepting block are both greater than the radius of the cylinder on the positioning block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention achieves automatic disengagement of the stuck impeller by changing the connection method between the corresponding connecting shell and the connecting shaft after a certain impeller is stuck by sand. At the same time, after the stuck impeller is disengaged, the submersible motor drives the other impellers normally, thereby ensuring that the other impellers can transmit well fluid normally, and also reducing the probability of motor burnout.

[0015] By periodically lifting the outer casing, the well fluid impurities can be automatically refluxed and removed, the impeller can be fully exposed for sand removal, and the friction block pressure can be released. This reduces the probability of impeller jamming, improves the reliability and service life of the equipment, and has the outstanding advantages of simple operation, efficient maintenance, and strong adaptability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the outer casing of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the mounting bracket of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the impeller of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the connecting shell of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the extrusion block of the present invention; Figure 7 This is a three-dimensional structural diagram of the moving block and friction block of the present invention; Figure 8 This is an exploded three-dimensional view of the impeller and retaining ring of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of the 3D structure at point A.

[0017] The markings in the diagram are as follows: 1-Mounting bracket, 2-Outer shell, 3-Connecting pipe, 4-Connecting shaft, 5-Connecting housing, 6-Impeller, 61-Fixing ring, 62-Positioning ring, 7-Limiting pin, 8-First spring, 9-Second spring, 10-Mounting housing, 11-Moving block, 12-Friction block, 13-Moving ring, 14-Moving rod, 15-Extrusion block, 151-Third spring, 16-Limiting groove, 17-Positioning block, 18-First intercepting block, 19-Second intercepting block. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0019] Example 1: A submersible electric pump unit, such as Figure 1-Figure 4 As shown, it includes: a mounting frame 1, on the lower side of which a separator, a protector, a submersible motor, and a stabilizer are arranged sequentially from top to bottom; a housing 2, disposed on the mounting frame 1, the housing 2 and the mounting frame 1 together forming a liquid storage chamber; a connecting pipe 3, fixedly connected to the upper side of the mounting frame 1 and communicating with the liquid storage chamber of the housing 2; a connecting shaft 4, rotatably connected to the mounting frame 1, and fixedly connected to the output shaft of the submersible motor; multiple connecting shells 5 in a linear array, all slidably and rotatably connected to the connecting shaft 4; impellers 6, the same number as the number of connecting shells 5, all rotatably connected to the connecting shaft 4, and the impellers 6 slidably connected to the corresponding connecting shells 5; a fixing ring 61 and a positioning ring 62, the same number as the number of connecting shells 5, both fixedly connected to the mounting frame 1, and the fixing ring 61 and the positioning ring 62 rotatably connected to the corresponding impellers 6; and a connecting assembly, the same number as the number of connecting shells 5, all disposed on the connecting shaft 4, the connecting assembly being used to change the relative position of the corresponding connecting shell 5 and the connecting shaft 4.

[0020] In the above scheme, the separator, protector, submersible motor, and centralizer are all existing devices and are not shown in the figure. The separator is used to separate gas from crude oil, the protector is used to protect the submersible motor to prevent overheating, and the centralizer is used to maintain the stability of the device's position. The mounting frame 1 consists of two upper and lower arc-shaped shells and several vertical rods evenly distributed around the circumference, and the lower arc-shaped shell of the mounting frame 1 is provided with multiple liquid inlet holes. In this embodiment, the outer shell 2 is fixedly connected to the mounting frame 1. The connecting pipe 3 is used to guide crude oil to a designated position. The specific number of connecting shells 5 is selected by the operator according to the specific needs of use. The connecting shell 5 consists of two inner and outer round tubes and an upper ring, wherein the lower side of the inner round tube of the connecting shell 5 is higher than the lower side of its outer round tube. The fixing ring 61 is located on the upper side of the corresponding impeller 6, and the fixing ring 61 is provided with several flow holes. The positioning ring 62 is located on the lower side of the corresponding impeller 6. The fixing ring 61 and the positioning ring 62 are used together to maintain the stability of the position of the corresponding impeller 6 and restrict the movement path of crude oil in the outer shell 2.

[0021] like Figures 4-6 As shown, the connecting assembly includes: two symmetrically distributed limiting pins 7, both slidably connected to the connecting shaft 4; a first spring 8 fixed between the connecting shaft 4 and the limiting pins 7; a connecting shell 5 with symmetrically distributed limiting slots; the limiting pins 7 being located in adjacent limiting slots on the corresponding connecting shell 5; and the limiting pins 7 being used to limit the connecting shell 5; and a second spring 9 fixed between the connecting shell 5 and the corresponding impeller 6.

[0022] In the above scheme, the connecting shaft 4 drives the corresponding connecting shell 5 to rotate synchronously through two adjacent limiting pins 7; the limiting groove on the connecting shell 5 is located on its inner circular tube, and the projection of the limiting groove on the horizontal plane of the connecting shell 5 is arc-shaped, and the central angle subtended by the arc is less than 180°; the first spring 8 is used to maintain the stability of the position of the limiting pin 7; the second spring 9 is located between the two circular tubes of the connecting shell 5, and the second spring 9 is fixedly connected to the circular ring on the connecting shell 5. Under normal conditions, the second spring 9 is in a charged state, which is used to drive the connecting shell 5 to move upward after the limiting pin 7 separates from the connecting shell 5.

[0023] like Figure 6 As shown, the limiting pin 7 is composed of a hemisphere and a cylinder, and the height of the upper limiting groove of the connecting shell 5 is less than the diameter of the hemisphere of the limiting pin 7.

[0024] In the above scheme, the size of the upper limit through groove of the connecting shell 5 is limited, so as to ensure that the limit pin 7 can be separated from the connecting shell 5 during the rotation of the connecting shaft 4.

[0025] like Figure 5 and Figure 6 As shown, the spring constant of the first spring 8 is greater than that of the second spring 9.

[0026] In the above scheme, the elastic coefficients of the first spring 8 and the second spring 9 are limited to ensure that, under normal conditions, the connecting shaft 4 can drive the corresponding connecting shell 5 to rotate through the limit pin 7.

[0027] The specific workflow of the above scheme is as follows: When oil extraction operations are required, the staff places the device in the predetermined position inside the oil well and then starts the submersible motor. The output shaft of the submersible motor drives the connecting shaft 4 to rotate. The connecting shaft 4 drives the separator to work on one hand, and drives all the connecting shells 5 to rotate through the limit pins 7 on it, thereby driving all the impellers 6 to rotate synchronously to extract well fluid. The well fluid moves upward along the oil well and enters the separator, where the separator separates the gas in the well fluid. The separated gas is discharged to a specific exhaust channel and collected by the staff.

[0028] After being processed by the separator, the well fluid enters the outer casing 2 through the inlet hole on the lower side of the mounting bracket 1. The well fluid entering the outer casing 2 flows along the middle of the bottommost impeller 6. Under the centrifugal force generated by the rotation of the bottommost impeller 6, the well fluid is thrown towards the position close to the inner wall of the outer casing 2, that is, into the gap between the outer casing 2 and the bottommost impeller 6. Subsequently, the well fluid flows upward along the flow hole on the bottommost fixing ring 61. Thus, all the impellers 6 together transport the well fluid upward to the connecting pipe 3, and finally flow along the connecting pipe 3 to the designated position.

[0029] During well fluid extraction, if sand particles enter the casing 2, they may accumulate in the gap between an impeller 6 and the casing 2, potentially causing the impeller 6 to seize. When the impeller 6 is seized, the torque required to drive it increases dramatically. If the seized impeller 6 remains rigidly connected to the connecting shaft 4, the submersible motor will be forced to output a huge torque to attempt to drive the impeller 6 to rotate, causing the submersible motor's operating current to surge and triggering the overload protection device to trip and stop the submersible motor. If the protection is not timely or fails, the submersible motor windings will burn out due to overheating. To address this problem, the present invention employs the following measures: After one of the impellers 6 is jammed by sand (e.g., the bottommost impeller 6), the impeller 6 no longer rotates with the connecting shaft 4. At this time, as the connecting shaft 4 drives the two limiting pins 7 to continue rotating, the two limiting pins 7 rotate relative to the connecting shell 5, causing the connecting shell 5 to squeeze the two limiting pins 7. The two limiting pins 7 are squeezed and move closer to each other, compressing the adjacent first spring 8. After both limiting pins 7 lose contact with the connecting shell 5, the connecting shell 5 is no longer limited by the limiting pins 7. Then, under the action of the second spring 9, the connecting shell 5 moves upward relative to the jammed impeller 6. When the connecting shell 5 moves upward to the limit position, the lower side of the inner tube of the connecting shell 5 is above the limiting pins 7, disconnecting the connecting shell 5 from the connecting shaft 4.

[0030] After the connecting shell 5 is disconnected from the connecting shaft 4, the two limiting pins 7 move to their initial positions under the action of the adjacent first springs 8. At this time, the connecting shaft 4 can no longer drive the connecting shell 5 at the bottom through the two limiting pins 7 at the bottom. The submersible motor only needs to drive the remaining unjammed impeller 6, which greatly reduces the required torque. The current of the submersible motor is kept within a safe range, reducing the risk of overload tripping and burning out the submersible motor.

[0031] After the designated time has elapsed, the staff will shut down the submersible motor and remove the device from the well for cleaning and maintenance in preparation for future use.

[0032] Example 2: Based on Example 1, as follows Figures 2-4 and Figures 6-8 As shown, it also includes: a braking assembly, the number of which is the same as the number of impellers 6. The braking assembly is set on the connecting shaft 4. The braking assembly is used to increase the resistance to the rotation of the corresponding impeller 6 when it is stuck. The braking assembly includes: a mounting shell 10, which is rotatably connected to the connecting shaft 4 and fixedly connected to the corresponding fixing ring 61; a moving block 11, which is slidably connected inside the mounting shell 10; a friction block 12, which is fixedly connected to the lower side of the moving block 11 and is used to increase the resistance to the rotation of the impeller 6; a moving ring 13, which is rotatably connected to the upper side of the corresponding connecting shell 5 and is located inside the mounting shell 10. The inner diameter of the moving ring 13 is larger than the diameter of the connecting shaft 4; and a moving rod 14, which is fixedly connected to the side of the moving ring 13 near the moving block 11. The moving block 11 is provided with an inclined groove for the moving rod 14 to slide. The lower side of the connecting shell 5 is provided with an inclined ring surface for pressing the corresponding limiting pin 7.

[0033] In the above scheme, the mounting shell 10 is located above the corresponding fixed ring 61, the moving block 11 is located on the left side of the mounting shell 10, and the friction block 12 is located on the lower left side of the moving block 11. In the initial state, the friction block 12 does not contact the adjacent impeller 6; the connecting shaft 4 is located inside the moving ring 13, and the connecting shaft 4 does not contact the moving ring 13 during rotation; the moving rod 14 is located on the left side of the moving ring 13, and the inclined groove on the moving block 11 is located on its right side, and the inclination angle of the inclined groove is 45°. The inclined groove on the moving block 11 is inclined from top to bottom to the right. In the normal state, the moving rod 14 is located at the lowermost side of the inclined groove on the adjacent moving block 11.

[0034] like Figure 8 As shown, the friction block 12 consists of a connecting part and a deformable part. The connecting part of the friction block 12 is fixedly connected to the moving block 11, and the deformable part of the friction block 12 is used to contact the impeller 6.

[0035] In the above scheme, the inclined part of the friction block 12 is inclined to the right from back to front, so as to Figure 6 Based on the top-to-bottom perspective, the impeller 6 rotates clockwise, so that after the inclined part of the friction block 12 comes into contact with the impeller 6, it can be compressed by the rotation of the impeller 6, thereby increasing the rotational resistance of the impeller 6.

[0036] The specific workflow of the above scheme is as follows: After disconnecting the jammed impeller 6 from the connecting shaft 4, if the sand particles stuck in the gap between the impeller 6 and the outer casing 2 are separated from the impeller 6 due to the flow of well fluid inside the outer casing 2, the impeller 6 will continue to rotate under the influence of the well fluid flow. However, the rotation speed of the impeller 6 is much lower than the rotation speed of the connecting shaft 4, thereby disrupting the normal flow of well fluid inside the outer casing 2 during the rotation of the impeller 6, resulting in a decrease in the efficiency of transporting well fluid. To address this problem, the present invention solves the above problem through the following measures: During the upward movement of the connecting shell 5 (taking the movement of the lowest connecting shell 5 as an example), the connecting shell 5 drives the moving ring 13 to move upward synchronously. The moving ring 13 drives the moving rod 14 to move upward, causing the moving rod 14 to move along the inclined groove of the moving block 11, thereby squeezing the moving block 11 and causing the moving block 11 to move to the right. The moving block 11 drives the arc-shaped part of the friction block 12 to move to the right synchronously. During the rightward movement, the arc-shaped part of the friction block 12 squeezes its inclined part, increasing the contact pressure between its inclined part and the impeller 6, thereby increasing the resistance to the rotation of the impeller 6, maintaining the stability of the impeller 6 position, reducing the impact of the impeller 6 on the flow of well fluid inside the outer shell 2, and ensuring that the device can efficiently transport well fluid.

[0037] After the designated period of use, the staff shall clean and maintain the device according to the above procedures, and reset the moved block 11 for subsequent use.

[0038] Example 3: Based on Example 2, such as Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, it also includes: extrusion blocks 15, the number of which is the same as the number of mounting shells 10, which are slidably connected to the corresponding mounting shells 10. The outer shell 2 is slidably connected to the mounting bracket 1 and the connecting pipe 3, and the outer shell 2 and the connecting pipe 3 together form a storage cavity. A third spring 151 is provided between the extrusion block 15 and the corresponding mounting shell 10. The extrusion block 15 is provided with a limiting groove 16. Positioning blocks 17, the number of which is the same as the number of mounting shells 10, are fixed to the corresponding moving rings 13. The positioning blocks 17 slide within the limiting grooves 16.

[0039] In the above scheme, the extrusion block 15 is located on the right side of the mounting shell 10. Under normal conditions, the interior of the outer shell 2 is in contact with the extrusion block 15, and the extrusion block 15 is limited by the outer shell 2. An inclined surface is provided on the right side of the extrusion block 15. The upper part of the outer shell 2 forms a storage cavity with the connecting pipe 3, and the outer shell 2 is connected to the hydraulic conveying device through a hose. Under normal conditions, the third spring 151 is in a compressed state. The positioning block 17 is composed of a horizontal block and a cylinder. The moving ring 13 drives the positioning block 17 to move synchronously, so that the cylinder of the positioning block 17 moves along the limiting groove 16.

[0040] like Figure 9 As shown, the limiting groove 16 is composed of a horizontal part, a vertical part and an inclined part, and the three parts of the same limiting groove 16 are connected in pairs.

[0041] In the above scheme, the distance between the inclined part of the limiting groove 16 and the connecting shaft 4 gradually decreases from bottom to top, and in the initial state, the cylinder of the positioning block 17 is located at the junction of the vertical part and the inclined part of the adjacent limiting groove 16.

[0042] like Figure 9 As shown, a first intercepting block 18 and a second intercepting block 19 are rotatably connected inside the limiting groove 16. The first intercepting block 18 is located at the junction of the inclined part and the vertical part of the limiting groove 16, and the second intercepting block 19 is located at the junction of the inclined part and the horizontal part of the limiting groove 16. Both the first intercepting block 18 and the second intercepting block 19 are provided with torsion springs between them and the pressing block 15.

[0043] In the above scheme, in the initial state, the first intercepting block 18 and the second intercepting block 19 can only rotate counterclockwise in the limiting groove 16 (to... Figure 9 (Using the reference viewpoint), the lengths of the first intercepting block 18 and the second intercepting block 19 are both greater than the radius of the cylinder on the positioning block 17, ensuring that the first intercepting block 18 and the second intercepting block 19 can normally limit and intercept the positioning block 17.

[0044] The specific workflow of the above solution is as follows (this embodiment still uses the example of the bottommost impeller 6 being stuck as an example for description): During the process of the connecting shell 5 driving the moving ring 13 to move upward, the moving ring 13 drives the positioning block 17 to move upward synchronously, so that the positioning block 17 moves upward along the vertical part of the limiting groove 16. When the connecting shell 5 moves upward to the limit position, the cylinder on the positioning block 17 is located at the junction of the vertical part and the horizontal part of the limiting groove 16. At this time, the pressing block 15 is limited by the outer shell 2 and cannot move to the right.

[0045] After the device has been used for a specified period of time, the operator uses the hydraulic delivery device to deliver hydraulic oil into the storage chamber of the outer casing 2, causing the outer casing 2 to move upwards. This releases the mounting bracket 1, allowing the well fluid that was originally located inside the outer casing 2 to flow back into the well. It also brings back impurities from the outer casing 2 to the well, cleaning them and reducing the probability of the impeller 6 getting stuck. As the distance the outer casing 2 moves upwards gradually increases, the number of exposed impellers 6 also gradually increases, allowing the sand particles that were originally stuck in the gap between the impeller 6 and the outer casing 2 to fall back into the well.

[0046] During the upward movement of the outer casing 2, when the lower side of the outer casing 2 moves upward to be flush with the lower side of the lowest pressing block 15, as the outer casing 2 continues to move upward, the lowest pressing block 15 moves to the right under the action of the third spring 151 (changing the contact position between the outer casing 2 and the lowest pressing block 15 from the side wall to the lower side, and at the same time, the contact position between the lowest pressing block 15 and the outer casing 2 also shifts to its inclined surface). During this process, the cylinder on the positioning block 17 moves to the left relative to the pressing block 15 along the horizontal part of the limiting groove 16 until the cylinder on the positioning block 17 aligns with the second intercepting block 19. After contact, during the continued movement, the cylinder on the positioning block 17 presses against the second intercepting block 19, causing the second intercepting block 19 to rotate under pressure. During the rotation, the second intercepting block 19 drives the adjacent torsion spring to twist and store force until the outer shell 2 completely loses contact with the lowermost pressing block 15. Under the action of the third spring 151, the pressing block 15 moves to the right to the limit position. At this time, the cylinder on the positioning block 17 is located at the junction of the inclined part and the horizontal part of the limiting groove 16, and the cylinder on the positioning block 17 separates from the second intercepting block 19. The second intercepting block 19 resets itself under the action of the adjacent torsion spring.

[0047] When the outer casing 2 moves upward to its limit position, all impellers 6 are exposed (the pressing blocks 15 corresponding to the impellers 6 that are not disconnected from the connecting shaft 4 do not move relative to each other). After a specified time, the operator controls the hydraulic conveying device to extract the hydraulic oil in the storage cavity of the outer casing 2, causing the outer casing 2 to move downward. During this process, the speed of the submersible motor is reduced (to reduce the resistance of the outer casing 2 moving downward).

[0048] After the outer shell 2 moves downward to contact the lowest pressing block 15, the inclined surface on the pressing block 15 is pressed as the outer shell 2 continues to move downward, causing the lowest pressing block 15 to move to the left. The pressing block 15 drives the first intercepting block 18 and the second intercepting block 19 to move to the left synchronously. During the movement, the second intercepting block 19 limits the positioning block 17, causing the cylinder on the positioning block 17 to move along the inclined part of the limiting groove 16 (the positioning block 17 moves downward under the pressure). At the same time, the positioning block 17 drives the connecting shell 5 to move downward synchronously through the moving ring 13.

[0049] As the positioning block 17 moves downward along the inclined portion of the limiting groove 16, when the cylinder of the positioning block 17 moves to contact the first intercepting block 18, the positioning block 17 continues to move and squeezes the first intercepting block 18, causing the first intercepting block 18 to rotate under pressure. During the rotation of the first intercepting block 18, the adjacent torsion spring is twisted and stores force until the squeezing block 15 moves to the left to the limit position (that is, when the right side of the squeezing block 15 contacts the inner wall of the outer shell 2). The positioning block 17 then drives the connecting shell 5 to move downward to the initial position. At this time, the cylinder on the positioning block 17 is located at the junction of the inclined portion and the vertical portion of the limiting groove 16, and the cylinder on the positioning block 17 no longer contacts the first intercepting block 18 (the first intercepting block 18 is reset under the action of the adjacent torsion spring).

[0050] As the moving ring 13 moves downward, it drives the moving rod 14 to move downward synchronously, causing the moving rod 14 to press against the inclined groove of the moving block 11. This causes the moving block 11 to move away from the connecting shaft 4. The moving block 11 drives the friction block 12 to move synchronously, thereby reducing the pressing force between the friction block 12 and the impeller 6 and reducing the friction between them. At the same time, the inclined annular surface on the lower side of the connecting shell 5 presses against the hemispherical part of the limiting pin 7 during the movement, causing the two limiting pins 7 to move closer to each other (compressing the two first springs 8). During the downward movement of the connecting shell 5, the two limiting pins 7 enter the two limiting through grooves on the connecting shell 5 respectively. When the connecting shell 5 moves downward to its limit position, the limiting through grooves on the connecting shell 5 are aligned with the limiting pins 7. At the same time, the two limiting pins 7 are located in different limiting through grooves on the connecting shell 5, and the two first springs 8 return to their uncompressed state, allowing the connecting shaft 4 to drive the connecting shell 5 to rotate again through the two limiting pins 7.

[0051] After the outer casing 2 moves downward to its limit position, the operator shuts off the hydraulic delivery device and restores the speed of the submersible motor to continue transporting well fluid. After the designated time of use, the operator cleans and maintains the device according to the above operation in preparation for subsequent use.

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A submersible electric pump unit, characterized in that, include: Mounting frame (1), the lower side of which is provided with a separator, a protector, a submersible motor and a stabilizer from top to bottom; The outer casing (2) is disposed on the mounting frame (1), and the outer casing (2) and the mounting frame (1) together form a liquid storage cavity; The connecting pipe (3) is fixed to the upper side of the mounting bracket (1) and communicates with the liquid storage chamber of the outer shell (2); The connecting shaft (4) is rotatably connected to the mounting bracket (1), and the connecting shaft (4) is fixedly connected to the output shaft of the submersible motor; The connecting shell (5) has multiple shells arranged in a linear array, all of which are slidably and rotatably connected to the connecting shaft (4). Impellers (6) are numbered the same as the connecting shells (5), and are rotatably connected to the connecting shaft (4). The impellers (6) are slidably connected to the corresponding connecting shells (5). The number of fixed rings (61) and positioning rings (62) is the same as the number of connecting shells (5). Both are fixed to the mounting frame (1). The fixed rings (61) and positioning rings (62) are rotatably connected to the corresponding impellers (6). The number of connecting components is the same as the number of connecting shells (5), and they are all set on the connecting shaft (4). The connecting components are used to change the relative position of the connecting shells (5) and the connecting shaft (4).

2. The submersible electric pump unit according to claim 1, characterized in that, The connection component includes: There are two symmetrically distributed limit pins (7), both of which are slidably connected to the connecting shaft (4). A first spring (8) is fixed between the connecting shaft (4) and the limit pins (7). The connecting shell (5) is provided with symmetrically distributed limit slots. The limit pins (7) are located in adjacent limit slots on the corresponding connecting shell (5). The second spring (9) is fixed between the connecting shell (5) and the corresponding impeller (6).

3. A submersible electric pump unit according to claim 2, characterized in that, The limiting pin (7) is composed of a hemisphere and a cylinder, and the height of the upper limiting groove of the connecting shell (5) is less than the diameter of the hemisphere of the limiting pin (7).

4. A submersible electric pump unit according to claim 2, characterized in that, The elastic coefficient of the first spring (8) is greater than that of the second spring (9).

5. A submersible electric pump unit according to claim 1, characterized in that, Also includes: The number of braking components is the same as the number of impellers (6). The braking components are disposed on the connecting shaft (4). The braking components are used to increase the resistance to the rotation of the impeller (6) when the corresponding impeller (6) is stuck. The braking components include: Mounting housing (10) is rotatably connected to the connecting shaft (4), and the mounting housing (10) is fixedly connected to the corresponding fixing ring (61); The movable block (11) is slidably connected to the mounting shell (10); Friction block (12) is fixed to the lower side of the moving block (11), and the friction block (12) is used to increase the resistance to the rotation of the impeller (6); The movable ring (13) is rotatably connected to the upper side of the corresponding connecting shell (5). The movable ring (13) is located inside the mounting shell (10). The inner diameter of the movable ring (13) is larger than the diameter of the connecting shaft (4). The moving rod (14) is fixed to the side of the moving ring (13) near the moving block (11). The moving block (11) is provided with an inclined groove for the moving rod (14) to slide. The lower side of the connecting shell (5) is provided with an inclined ring surface for pressing the corresponding limiting pin (7).

6. A submersible electric pump unit according to claim 5, characterized in that, The friction block (12) is composed of a connecting part and a deformable part. The connecting part of the friction block (12) is fixedly connected to the moving block (11), and the deformable part of the friction block (12) is used to contact the impeller (6).

7. A submersible electric pump unit according to claim 5, characterized in that, Also includes: The number of extrusion blocks (15) is the same as the number of mounting shells (10), and they are slidably connected to the corresponding mounting shells (10). The outer shell (2) is slidably connected to the mounting bracket (1) and the connecting pipe (3), and the outer shell (2) and the connecting pipe (3) together form a storage cavity. A third spring (151) is provided between the extrusion block (15) and the corresponding mounting shell (10). The extrusion block (15) is provided with a limit groove (16). The number of positioning blocks (17) is the same as the number of mounting shells (10), and they are fixed to the corresponding moving rings (13). The positioning blocks (17) slide in the limiting grooves (16).

8. A submersible electric pump unit according to claim 7, characterized in that, The limiting groove (16) is composed of a horizontal part, a vertical part and an inclined part, and the three parts of the same limiting groove (16) are connected in pairs.

9. A submersible electric pump unit according to claim 8, characterized in that, The limiting groove (16) is rotatably connected to a first intercepting block (18) and a second intercepting block (19). The first intercepting block (18) is located at the junction of the inclined part and the vertical part of the limiting groove (16), and the second intercepting block (19) is located at the junction of the inclined part and the horizontal part of the limiting groove (16). Both the first intercepting block (18) and the second intercepting block (19) are provided with torsion springs between them and the pressing block (15).

10. A submersible electric pump unit according to claim 9, characterized in that, The positioning block (17) is composed of a horizontal block and a cylinder. The lengths of the first intercepting block (18) and the second intercepting block (19) are both greater than the radius of the cylinder on the positioning block (17).

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