Submersible electric pumps and their protectors

Abstract

This application relates to the field of submersible electric pump technology, and provides a submersible electric pump and its protector. The protector includes a protector body having a connected transmission space and an oil storage space; the oil storage space includes a connected first space and a reserved space, with motor oil filling the first space; both ends of the protector body are connected to a motor and an impeller assembly, respectively; a transmission shaft is disposed in the transmission space, with both ends connected to the motor and the impeller assembly, respectively; one end of an immersion auxiliary structure is disposed on the bottom wall of the oil storage space, and the other end abuts against the power output end of the transmission shaft near the motor; the immersion auxiliary structure is used to drive the motor oil in the oil storage space to rotate; the transmission shaft is used to drive the motor oil in the oil storage space to rotate through the immersion auxiliary structure when the submersible electric pump is operating, thereby allowing the motor oil to immerse the transmission shaft. The submersible electric pump and its protector provided by this application can increase its service life in high-temperature environments.

Description

Technical Field

[0001] This application relates to the field of submersible electric pump technology, and in particular to a submersible electric pump and its protector. Background Technology

[0002] Electric Submersible Pumps (ESPs) are crucial downhole lifting equipment in oilfield development, widely used in medium- to high-yield oil wells. Their downhole units mainly consist of multi-stage impeller assemblies, submersible motors, protectors, and possibly gas separators. Among these, the protector is one of the core components ensuring the long-term, stable, and reliable operation of the entire system; its performance directly determines the ESP's lifespan and adaptability to various operating conditions.

[0003] The submersible pumps in related technologies mainly use two types of protectors: sedimentation protectors and bladder protectors. When the temperature of the motor oil rises, the bladder of the bladder will age faster, which will reduce the service life of the bladder. Sedimentation protectors separate the well fluid and motor oil by sedimentation. When they work in a high-temperature environment, they are filled with motor oil and a small amount of well fluid, which will cause excessive internal pressure, thus reducing the service life of the submersible pump protector. Summary of the Invention

[0004] This application provides a submersible electric pump and its protector, which can improve the technical problem in the related art of reduced service life of the submersible electric pump protector due to increased motor oil temperature.

[0005] In a first aspect, embodiments of this application provide a protector for a submersible electric pump, the submersible electric pump including a motor and an impeller assembly, one end of the protector being connected to the motor and the other end being connected to the impeller assembly; the protector includes:

[0006] The protector body has a transmission space and an oil storage space located around the transmission space, the oil storage space being connected to the transmission space; the oil storage space stores motor oil, the oil storage space including a first space and a reserved space, the first space being connected to the reserved space, the motor oil filling the first space; one end of the protector body is connected to the motor, and the other end is connected to the impeller assembly;

[0007] A drive shaft is rotatably disposed within the transmission space, and both ends of the drive shaft extend to the outside of the transmission space; one end of the drive shaft is connected to the power output end of the motor, and the other end is connected to the rotating shaft of the impeller assembly; and

[0008] An immersion auxiliary structure is provided, one end of which is disposed on the bottom wall of the oil storage space, and the other end of which abuts against the power output end of the drive shaft near the motor; the immersion auxiliary structure is used to drive the motor oil in the oil storage space to rotate when the drive shaft rotates;

[0009] The drive shaft is used to drive the immersion auxiliary structure to rotate when the submersible electric pump is operating, thereby rotating the motor oil in the oil storage space, allowing the motor oil to immerse the drive shaft, and thus enabling the protector to operate normally.

[0010] The technical solutions described in this application embodiment have at least the following technical effects:

[0011] The protector for the submersible electric pump provided in this application embodiment divides the oil storage space into a first space and a reserved space. By storing the motor oil in the first space and setting the reserved space to be empty, the motor oil can expand into the reserved space when the temperature rises, thereby preventing the motor oil from exerting excessive pressure on the side wall of the protector body and thus avoiding damage to the side wall of the protector body. Because the reserved space is idle when the motor oil temperature is normal, the motor oil cannot completely submerge the drive shaft. To solve this problem, the protector of the submersible pump of this application uses a submersion auxiliary structure to rotate the motor oil in the first space, causing the motor oil to form a vortex, thereby allowing the motor oil to submerge the drive shaft. The rotating motor oil also applies pressure to the side wall of the protector body, making the pressure inside the side wall of the protector body slightly greater than the pressure outside the side wall, thus preventing external well oil from entering the oil storage space through gaps or damage in the protector body. Connecting the submersion auxiliary structure to the drive shaft, and having the drive shaft drive the motor oil to rotate through the submersion auxiliary structure, simplifies the structure of the protector and reduces its production cost. The rotation of the motor oil also accelerates the heat dissipation of the motor oil.

[0012] In some embodiments, the immersion aid structure includes:

[0013] A drive wheel is mounted on the drive shaft, and the drive wheel is located at the lower end of the drive shaft. The drive shaft is also used to drive the drive wheel to rotate.

[0014] An auxiliary component is movably disposed on the bottom wall of the oil storage space;

[0015] The driven wheel is rotatably fitted onto the auxiliary component;

[0016] A transmission belt is disposed on the driving pulley and the driven pulley; and

[0017] An impeller is rotatably mounted on the auxiliary component, and the driven wheel is connected to the impeller on the side facing away from the bottom wall of the oil storage space.

[0018] The driving wheel is used to drive the driven wheel to rotate via the transmission belt, so that the impeller can rotate within the oil storage space, thereby driving the motor oil within the oil storage space to rotate.

[0019] In some embodiments, the immersion auxiliary structure includes one driving wheel, two auxiliary components, two driven wheels, a transmission belt, and two impellers; both auxiliary components are disposed on the bottom wall of the oil storage space, and the two auxiliary components are symmetrical about the transmission shaft; the two driven wheels are rotatably sleeved on the two auxiliary components respectively, the diameter of the driving wheel is larger than the diameter of the two driven wheels, and the diameters of the two driven wheels are equal; the transmission belt presses against the two driven wheels and the driving wheel respectively; the driving wheel is used to drive the two driven wheels to rotate in the same direction through the transmission belt, so that the two driven wheels drive the two impellers to rotate in the same direction, thereby enabling the motor oil in the oil storage space to form two symmetrical vortices in the same direction, thus ensuring that the motor oil in the oil storage space can immerse the transmission shaft.

[0020] In some embodiments, the driven wheel is shaped like a frustum, and the height of the driven wheel is equal to the height of the driving wheel and greater than the height of the transmission belt; two adjustment through holes are provided on the side wall of the oil storage space, and the oil storage space is connected to the external space through the two adjustment through holes respectively; the adjustment through hole includes a first hole section and a second hole section, the first hole section is connected to the second hole section, the first hole section is connected to the external space, the second hole section is connected to the oil storage space, and the inner side wall of one side of the second hole section coincides with the inner bottom wall of the oil storage space, and the first hole section is set at an angle to the inner side wall of the oil storage space;

[0021] The immersion aid structure also includes:

[0022] Two first adjusting members are movably disposed within the two first hole sections, respectively;

[0023] Two second adjusting members are movably disposed within the two second orifice sections, respectively. Each second adjusting member is movable to partially enter the oil storage space. One end of the second adjusting member facing the oil storage space is configured as an inclined surface. The distance between the side of the second adjusting member that abuts against the bottom wall of the oil storage space and the drive shaft is less than the distance between the side of the second adjusting member that is away from the bottom wall of the oil storage space and the drive shaft. The inclined surface can be used to abut against the driven wheel.

[0024] A filling medium is disposed within the two adjustment through holes, and the filling medium is always located between the first adjustment member and the second adjustment member;

[0025] The first adjusting member is used to move towards the second orifice when the pressure in the external space is greater than the pressure of the filling medium, so that the filling medium pushes the second adjusting member towards the driven wheel, thereby causing the inclined plane to push the driven wheel away from the bottom wall of the oil storage space, thus reducing the transmission ratio between the driving wheel and the driven wheel, and ultimately increasing the rotational speed of the impeller; the first adjusting member is also used to move away from the second orifice when the pressure in the external space is less than the pressure of the filling medium, so that the filling medium pushes the second adjusting member away from the driven wheel, thereby causing the driven wheel to move away from the bottom wall of the oil storage space, thus increasing the transmission ratio between the driving wheel and the driven wheel, and ultimately slowing down the rotational speed of the impeller.

[0026] In some embodiments, the immersion aid structure further includes at least two sealing rings, one of which is disposed at the end of the first adjusting member away from the external space, and the other is disposed at the end of the second adjusting member away from the drive shaft, and both sealing rings are always located within the adjusting through hole.

[0027] In some embodiments, a mounting groove is provided at the point where the driven wheel abuts against the inclined surface; the immersion auxiliary structure further includes a plurality of steel balls, which are rotatably disposed in the mounting groove.

[0028] In some embodiments, a movable groove is formed on the bottom wall of the oil storage space, the direction of the movable groove being consistent with the direction of one of the radii of the oil storage space, and the immersion auxiliary structure further includes:

[0029] A stabilizing component is movably disposed within the moving groove; the stabilizing component has an auxiliary hole, and the auxiliary component is disposed within the auxiliary hole; and

[0030] A return piece is located at one end of the moving groove, with one end of the return piece connected to the stabilizing member and the other end connected to the side wall of the moving groove;

[0031] The return member is used to push the stabilizer to move away from the drive shaft when the driven wheel moves toward the bottom wall of the oil storage space, so as to drive the driven wheel to move away from the drive shaft through the auxiliary member, thereby causing the driven wheel to abut against the drive belt, so that the driving wheel can drive the driven wheel to rotate through the drive belt.

[0032] In some embodiments, the cross-section of the stabilizer can completely cover the cross-section of the auxiliary component; a fixing groove is provided on the side wall of the moving groove along the radial direction, and the immersion auxiliary structure further includes a fixing component, one end of which is disposed on the fixing groove, and the fixing component is used to prevent the stabilizer from leaving the moving groove.

[0033] In some embodiments, the shape of the stabilizer is set as a cuboid or a cube.

[0034] Secondly, embodiments of this application provide a submersible pump, the submersible electric pump including a protector for the submersible electric pump as described in any of the embodiments of the first aspect above. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A three-dimensional structural schematic diagram of the submersible electric pump provided in the embodiments of this application;

[0037] Figure 2 A side view of the submersible electric pump provided in an embodiment of this application;

[0038] Figure 3 For along Figure 2 Cross-sectional view of line AA in the middle;

[0039] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle.

[0040] The following are the labeling elements in the figure:

[0041] 100. Submersible electric pump; 10. Motor; 20. Impeller assembly;

[0042] 30. Protector; 31. Protector body; 310. Transmission space; 311. Oil storage space; 312. First space; 313. Reserved space; 314. Adjustment through hole; 315. First hole section; 316. Second hole section; 317. Moving groove; 32. Transmission shaft;

[0043] 33. Immersion auxiliary structure; 331. Driving wheel; 332. Auxiliary component; 333. Driven wheel; 3331. Steel ball; 334. Transmission belt; 335. Impeller; 336. First adjusting component; 337. Second adjusting component; 338. Filling medium; 339. Sealing ring; 341. Stabilizing component; 342. Returning component; 343. Fixing component. Detailed Implementation

[0044] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0046] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0047] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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.

[0048] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "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.

[0049] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0050] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0051] Electric Submersible Pumps (ESPs) are crucial downhole lifting equipment in oilfield development, widely used in medium- to high-yield oil wells. Their downhole units mainly consist of multi-stage impeller assemblies, submersible motors, protectors, and possibly gas separators. Among these, the protector is one of the core components ensuring the long-term, stable, and reliable operation of the entire system; its performance directly determines the ESP's lifespan and adaptability to various operating conditions.

[0052] The submersible pumps in related technologies mainly use two types of protectors: sedimentation protectors and bladder protectors. When the temperature of the motor oil rises, the bladder of the bladder will age faster, which will reduce the service life of the bladder. Sedimentation protectors separate the well fluid and motor oil by sedimentation. When they work in a high-temperature environment, they are filled with motor oil and a small amount of well fluid, which will cause excessive internal pressure, thus reducing the service life of the submersible pump protector.

[0053] Based on this, in order to improve the problem of reduced service life of submersible pump protectors caused by increased motor oil temperature in related technologies, the embodiments of this application provide the following solutions.

[0054] Please refer to the following: Figures 1 to 4This application provides a protector 30 for a submersible electric pump 100. The submersible electric pump 100 includes a motor 10 and an impeller assembly 20. One end of the protector 30 is connected to the motor 10, and the other end is connected to the impeller assembly 20. The protector 30 includes a protector body 31, a drive shaft 32, and an immersion auxiliary structure 33, wherein:

[0055] The protector body 31 has a transmission space 310 and an oil storage space 311 located around the transmission space 310. The oil storage space 311 is connected to the transmission space 310. The oil storage space 311 stores motor oil. The oil storage space 311 includes a first space 312 and a reserved space 313. The first space 312 and the reserved space 313 are connected. Both the first space 312 and the reserved space 313 are connected to the transmission space 310. The motor oil fills the first space 312. One end of the protector body 31 is connected to the motor 10, and the other end is connected to the impeller assembly 20.

[0056] The drive shaft 32 is rotatably disposed within the transmission space 310, and both ends of the drive shaft 32 extend to the outside of the transmission space 310; one end of the drive shaft 32 is connected to the power output end of the motor 10, and the other end is connected to the rotating shaft of the impeller assembly 20.

[0057] The immersion auxiliary structure 33 has one end disposed on the bottom wall of the oil storage space 311, and the other end abuts against the power output end of the drive shaft 32 near the motor 10; the immersion auxiliary structure 33 is used to drive the motor oil in the oil storage space 311 to rotate when the drive shaft 32 rotates.

[0058] The drive shaft 32 is used to drive the submersion auxiliary structure 33 to rotate when the submersible electric pump 100 is working, so as to drive the motor oil in the oil storage space 311 to rotate, thereby allowing the motor oil to submerge the drive shaft 32, so that the protector 30 can work normally.

[0059] It is understood that the protector body 31 is a component for housing the drive shaft 32 and the immersion auxiliary structure 33; for example, the protector body 31 can be a metal cylinder or a metal square cylinder, etc. (the metal cylinder has a removable metal cover; the metal square cylinder has a removable metal cover). The drive shaft 32 is a component for transmitting the output power of the motor 10 to the impeller assembly 20; for example, the drive shaft 32 can be a metal rod or a metal column, etc. The immersion auxiliary structure 33 is a component for driving the motor oil to rotate; for example, the immersion auxiliary structure 33 includes a drive wheel 331, an auxiliary component 332, a driven wheel 333, a drive belt, and an impeller 335, etc.

[0060] As can be seen from the above, the protector 30 of the submersible electric pump 100 provided in this application embodiment divides the oil storage space 311 into a first space 312 and a reserved space 313. By storing the motor oil in the first space 312 and setting the reserved space to be empty, the motor oil can expand into the reserved space 313 when the temperature rises, thereby preventing the motor oil from putting too much pressure on the side wall of the protector body 31, thus avoiding damage to the side wall of the protector body 31. Since the reserved space 313 is idle when the motor oil temperature is normal, the motor oil fails to completely submerge the drive shaft 32. To solve this problem, the protector 30 of the submersible pump 100 of this application uses a submersion auxiliary structure 33 to rotate the motor oil in the first space 312, causing the motor oil to form a vortex, thereby allowing the motor oil to submerge the drive shaft 32. The rotating motor oil also applies pressure to the side wall of the protector body 31, making the pressure inside the side wall of the protector body 31 slightly greater than the pressure outside the side wall, thus preventing external well oil from entering the oil storage space 311 through gaps or damage in the protector body 31. By connecting the submersion auxiliary structure 33 to the drive shaft 32, and having the drive shaft 32 rotate the motor oil via the submersion auxiliary structure 33, the structure of the protector 30 can be simplified, and the production cost of the protector 30 can be reduced. The rotation of the motor oil can also accelerate the heat dissipation of the motor oil.

[0061] In some embodiments, please refer to the following: Figures 1 to 4 The immersion auxiliary structure 33 includes a driving wheel 331, an auxiliary component 332, a driven wheel 333, a transmission belt 334, and an impeller 335, wherein:

[0062] A drive wheel 331 is mounted on a drive shaft 32, and is located at the lower end of the drive shaft 32. The drive shaft 32 also drives the drive wheel 331 to rotate. An auxiliary component 332 is movably mounted on the bottom wall of the oil storage space 311. A driven wheel 333 is rotatably mounted on the auxiliary component 332, and is located on the same plane as the drive wheel 331. A transmission belt 334 is mounted on the drive wheel 331 and the driven wheel 333. An impeller 335 is rotatably mounted on the auxiliary component 332, and the side of the driven wheel 333 facing away from the bottom wall of the oil storage space 311 is connected to the impeller 335.

[0063] The driving wheel 331 is used to drive the driven wheel 333 to rotate via the transmission belt 334, so that the impeller 335 can rotate in the oil storage space 311, thereby driving the motor oil in the oil storage space 311 to rotate.

[0064] It can be understood that the structure consisting of the driving wheel 331, the driven wheel 333, and the transmission belt is used to transmit power from the drive shaft 32 to the impeller 335. The auxiliary component 332 is a member used to fix the driven wheel 333 and the impeller 335 to the bottom wall of the oil storage space 311; for example, the auxiliary component 332 includes a metal rod or metal column. The impeller 335 is a member used to drive the motor oil to rotate.

[0065] With this configuration, the drive shaft 32 drives the drive wheel 331 to rotate, which in turn drives the drive belt 334 to rotate, which in turn drives the driven wheel 333 to rotate, thereby driving the impeller 335 to rotate, and finally driving the motor oil to rotate in the oil storage space 311. By setting the drive wheel 331, the driven wheel 333 and the drive belt to form a structure that transmits the drive shaft 32, the above structure can be more cost-effective than the structure that uses gear transmission.

[0066] Optionally, in some embodiments, please refer to Figures 1 to 4 The immersion auxiliary structure 33 includes a drive wheel 331, two auxiliary components 332, two driven wheels 333, a transmission belt, and two impellers 335. The two auxiliary components 332 are both disposed on the bottom wall of the oil storage space 311, and the two auxiliary components 332 are symmetrical about the transmission shaft 32. The two driven wheels 333 are rotatably sleeved on the two auxiliary components 332 respectively. The diameter of the drive wheel 331 is larger than the diameter of the two driven wheels 333, and the diameters of the two driven wheels 333 are equal. The transmission wheel presses against the two driven wheels 333 and the drive wheel 331 respectively. The drive wheel 331 is used to drive the two driven wheels 333 to rotate in the same direction through the transmission belt, so that the two driven wheels 333 drive the two impellers 335 to rotate in the same direction, thereby enabling the motor oil in the oil storage space 311 to form two symmetrical vortices in the same direction, thus ensuring that the motor oil in the oil storage space 311 can immerse the transmission shaft 32.

[0067] Compared to a scheme with only one driving wheel 331, one driven wheel 333, one auxiliary component 332, one transmission belt, and one impeller 335, this configuration allows the motor oil in the oil storage space 311 to form two symmetrical vortices, so that the intersection of the two turbines is located at the transmission shaft 32, thereby enabling the motor oil to submerge the transmission shaft 32. Furthermore, by setting the two impellers 335 to rotate in the same direction, the two vortices also rotate in the same direction, increasing the pressure at the intersection of the two vortices. Consequently, the pressure on the inner wall of the oil storage space 311 is greater than the pressure on the outer wall of the oil storage space 311.

[0068] Optionally, please refer to Figures 1 to 4The driven wheel 333 is shaped like a frustum, and its height is equal to or greater than that of the driving wheel 331. Two adjustment holes 314 are provided on the side wall of the oil storage space 311, connecting the oil storage space 311 to the external space. Each adjustment hole 314 includes a first section 315 and a second section 316. The first section 315 is connected to the external space, and the second section 316 is connected to the oil storage space 311. The inner sidewall of one side of the second section 316 coincides with the inner bottom wall of the oil storage space 311, while the first section 315 is angled to the inner sidewall of the oil storage space 311.

[0069] The immersion auxiliary structure 33 also includes two first adjusting members 336, two second adjusting members 337, and a filling medium 338, wherein:

[0070] Two first adjusting members 336 are respectively movably disposed within the first hole section 315.

[0071] Two second adjusting members 337 are movably disposed within the second hole section 316. The second adjusting members 337 can be moved to a portion of the oil storage space 311. The end of the second adjusting member 337 facing into the oil storage space 311 is set as an inclined surface. The distance between the side of the second adjusting member 337 that abuts against the bottom wall of the oil storage space 311 and the drive shaft 32 is less than the distance between the side of the second adjusting member 337 that is away from the bottom wall of the oil storage space 311 and the drive shaft 32. The inclined surface can be used to abut against the driven wheel 333.

[0072] The filling medium 338 is disposed in the two adjustment through holes 314, and the filling medium 338 is always located between the first adjustment member 336 and the second adjustment member 337.

[0073] The first adjusting member 336 is used to move towards the second orifice section 316 when the pressure in the external space is greater than the pressure of the filling medium 338, so that the filling medium 338 pushes the second adjusting member 337 towards the driven wheel 333, thereby causing the inclined plane to push the driven wheel 333 to move away from the inner bottom wall of the oil storage space 311, thereby reducing the transmission ratio between the driving wheel 331 and the driven wheel 333, and ultimately increasing the rotational speed of the impeller 335; the first adjusting member 336 is used to move away from the second orifice section 316 when the pressure in the external space is less than the pressure of the filling medium 338, so that the filling medium 338 pushes the second adjusting member 337 to move away from the driven wheel 333, thereby causing the driven wheel 333 to move away from the inner bottom wall of the oil storage space 311, thereby increasing the transmission ratio between the driving wheel 331 and the driven wheel 333, and ultimately slowing down the rotational speed of the impeller 335.

[0074] It can be understood that the structure consisting of the first adjusting member 336, the second adjusting member 337, and the filling medium 338 is a component used to adjust the distance between the driven wheel 333 and the bottom wall of the oil storage space 311; for example, the first adjusting member 336 can be a metal rod or a metal block, etc. For example, the second adjusting member 337 can be a metal rod or a metal block, etc. For example, the filling medium 338 can be tap water or alcohol, etc.

[0075] This configuration, by setting the driven wheel 333 to a frustum shape and ensuring its height is equal to the height of the driving wheel 331 and greater than the height of the transmission belt, changes the distance between the driven wheel 333 and the inner bottom wall of the oil reservoir 311. This, in turn, changes the position of the transmission belt on the driven wheel 333, thereby altering the transmission ratio between the driving wheel 331 and the driven wheel 333, and ultimately changing the rotational speed of the motor oil within the reservoir. This process adjusts the rotational speed of the motor oil within the reservoir, thereby changing the centripetal force required by the motor oil within the reservoir 311 (the centripetal force of the motor oil is provided by the sidewall of the reservoir, and since forces are mutual, the force exerted by the motor oil on the sidewall of the reservoir 311 is equal to the centripetal force of the motor oil), and thus changing the pressure of the motor oil on the inner sidewall of the reservoir. An adjustment trigger structure is formed by setting up a first adjusting member 336, a filling medium 338, and a second adjusting member 337. The first adjusting member 336 is connected to the external space, and the second adjusting member 337 is connected to the liquid storage space. The inclined surface of the second adjusting member 337 abuts against the driven wheel 333, thereby changing the distance between the driven wheel 333 and the bottom wall of the liquid storage space, thus changing the transmission ratio between the driving wheel 331 and the driven wheel 333, and thus changing the rotation speed of the motor oil in the liquid storage space. Furthermore, the first adjusting member 336, the filling medium 338, and the second adjusting member 337 link the external pressure with the pressure inside the liquid storage space. Based on the pressure difference between the inside and outside of the side wall, the positional relationship between the second adjusting member 337 and the driven wheel 333 is adjusted, thereby changing the distance between the driven wheel 333 and the bottom wall of the liquid storage space. By filling the space between the first regulating member 336 and the second regulating member 337 with a filling medium 338 (which is neither soluble in external liquids nor in motor oil), external well fluid can be prevented from entering the storage space through the regulating through hole 314.

[0076] For example, please refer to Figures 1 to 4 The immersion auxiliary structure 33 also includes at least two sealing rings 339, one of which is located at the end of the first adjusting member 336 away from the external space, and the other is located at the end of the second adjusting member 337 away from the drive shaft 32. The two sealing rings 339 are always located within the adjusting through hole 314.

[0077] It is understood that the sealing ring 339 is a component used to prevent the external space from being connected to the liquid storage space through the adjustment through hole 314; for example, the sealing ring 339 can be a rubber sealing ring 339, etc.

[0078] With this configuration, sealing rings 339 are respectively provided on the first adjusting member 336 and the second adjusting member 337 to ensure that the external space is isolated from the liquid storage space.

[0079] In some embodiments, please refer to Figures 1 to 4 An installation groove is provided at the point where the driven wheel 333 abuts against the inclined surface; the immersion auxiliary structure 33 also includes a plurality of steel balls 3331, which are rotatably disposed in the installation groove.

[0080] It is understandable that the steel ball 3331 is a mechanism used to reduce the friction between the driven wheel 333 and the inclined plane.

[0081] This configuration, by placing the steel ball 3331 in the mounting groove, reduces the friction between the inclined surface and the driven wheel 333, thereby allowing the second adjusting member 337 to easily push the driven wheel 333 (i.e., preventing jamming between the second adjusting member 337 and the driven wheel 333).

[0082] Optionally, in some embodiments, please refer to Figures 1 to 4 A movable groove 317 is provided on the bottom wall of the oil storage space 311. The direction of the movable groove 317 is consistent with the direction of one of the radii of the oil storage space 311. The immersion auxiliary structure 33 also includes:

[0083] Stabilizer 341 is movably disposed within moving groove 317; stabilizer 341 has an auxiliary hole, and auxiliary component 332 is rotatably disposed within the auxiliary hole; and

[0084] The return piece 342 is located at one end of the moving groove 317. One end of the return piece 342 is connected to the stabilizer 341, and the other end is connected to the side wall of the moving groove 317.

[0085] The return member 342 is used to push the stabilizer 341 to move away from the drive shaft 32 when the driven wheel 333 moves toward the bottom wall of the oil storage space 311, so that the driven wheel 333 can move away from the drive shaft 32 through the auxiliary member 332, thereby causing the driven wheel 333 to abut against the drive belt 334, so that the drive wheel 331 can drive the driven wheel 333 to rotate through the drive belt.

[0086] It can be understood that the stabilizer 341 is a component used to help the auxiliary component 332 move along the direction of the moving groove 317; for example, the stabilizer 341 can be a metal block or a metal plate, etc. The return component 342 is a component used to help the stabilizer 341 return to its original position; for example, the return component 342 can be a metal spring or a cylinder, etc.

[0087] With this configuration, the auxiliary component 332 is fixed to the stabilizing component 341, allowing the auxiliary component 332 to be stably positioned on the inner bottom wall of the oil storage space 311. The return component 342 is positioned between the stabilizing component 341 and the side wall of the moving groove 317. This allows the return component 342 to push the stabilizing component 341 away from the drive shaft 32 when the driven wheel 333 moves away from the inner bottom wall of the oil storage space 311 (i.e., when the drive belt 334 is slack), thereby keeping the drive belt 334 taut. This structure allows the transmission ratio between the driving wheel 331 and the driven wheel 333 to be changed while the drive belt remains taut, thus changing the rotational speed of the impeller 335 without altering the rotational speed of the drive shaft 32.

[0088] Optionally, please refer to Figures 1 to 4 The cross-section of the stabilizer 341 can completely cover the cross-section of the auxiliary component 332; the moving groove 317 has a fixing groove on its side wall along the radial direction, and the immersion auxiliary structure 33 also includes a fixing component 343, one end of which is set on the fixing groove, and the fixing component 343 is used to prevent the stabilizer 341 from leaving the moving groove 317.

[0089] It can be understood that the fastener 343 is a component used to prevent the stabilizer 341 from moving out of the moving slot 317; for example, the fastener 343 can be a metal plate or a metal block, etc.

[0090] With this configuration, the force exerted by the transmission belt 334 on the driven pulley 333 is opposite in direction to the force exerted by the return member 342 on the stabilizer 341. Therefore, both ends of the auxiliary member 332 will be subjected to forces in opposite directions (i.e., forming a torque), which will cause the auxiliary member 332 to rotate, thus preventing the immersion auxiliary structure 33 from functioning properly. Therefore, this application provides a fixing groove, and the fixing member 343 is detachably disposed within the fixing groove, thereby preventing the stabilizer 341 from disengaging from the moving groove 317, and thus preventing the auxiliary member 332 from rotating.

[0091] In some embodiments, please refer to Figures 1 to 4 The shape of the stabilizer 341 is set as a cuboid.

[0092] By setting the stabilizer 341 as a cuboid, it is possible to prevent the stabilizer 341 from rotating within the moving groove 317, thereby preventing the driven wheel 333 from rotating and causing the stabilizer 341 to rotate via the auxiliary component 332, thus preventing the return component 342 from being damaged.

[0093] This application also provides a submersible electric pump 100, which includes a protector 30 for the submersible electric pump of any of the above embodiments.

[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protector for a submersible electric pump, characterized in that The submersible electric pump comprises a motor and an impeller assembly, one end of the protector is connected to the motor and the other end is connected to the impeller assembly; the protector comprises: a protector body having a transmission space and an oil storage space located at the periphery of the transmission space, the oil storage space being in communication with the transmission space; the oil storage space stores motor oil, the oil storage space comprises a first space and a reserved space, the first space is in communication with the reserved space, the first space and the reserved space are both in communication with the transmission space, the motor oil fills the first space; one end of the protector body is connected to the motor and the other end is connected to the impeller assembly; a transmission shaft rotatably arranged in the transmission space and extending to the outside of the transmission space at both ends; one end of the transmission shaft is connected to the power output end of the motor and the other end is connected to the rotating shaft of the impeller assembly; and a submersion auxiliary structure, one end of the submersion auxiliary structure is arranged on the bottom wall of the oil storage space and the other end abuts against the transmission shaft near the power output end of the motor; the submersion auxiliary structure is used to rotate the motor oil in the oil storage space when the transmission shaft rotates; wherein the transmission shaft is used to rotate the submersion auxiliary structure to rotate the motor oil in the oil storage space when the submersible electric pump is working, so that the motor oil can immerse the transmission shaft when the motor is working, thereby enabling the protector to work normally; the submersion auxiliary structure comprises: a driving wheel arranged on the transmission shaft and located at the lower end of the transmission shaft, the transmission shaft is also used to rotate the driving wheel; an auxiliary member movably arranged on the bottom wall of the oil storage space; a driven wheel rotatably sleeved on the auxiliary member; a transmission belt arranged on the driving wheel and the driven wheel; and an impeller rotatably sleeved on the auxiliary member and connected to the side of the driven wheel away from the bottom wall of the oil storage space; wherein the driving wheel is used to rotate the driven wheel through the transmission belt to enable the impeller to rotate in the oil storage space, thereby rotating the motor oil in the oil storage space.

2. The protector of claim 1, wherein: The immersion auxiliary structure comprises one driving wheel, two auxiliary members, two driven wheels, one transmission belt and two impellers; the two auxiliary members are arranged on the bottom wall of the oil storage space, and the two auxiliary members are symmetrical about the transmission shaft; the two driven wheels are rotatably sleeved on the two auxiliary members respectively, the diameter of the driving wheel is greater than the diameters of the two driven wheels, and the diameters of the two driven wheels are equal; the transmission belt is pressed against the two driven wheels and the driving wheel respectively; the driving wheel is used to drive the two driven wheels to rotate in the same direction through the transmission belt, so that the two driven wheels drive the two impellers to rotate in the same direction, and then the motor oil in the oil storage space can form two symmetrical and same-direction vortexes, thereby ensuring that the motor oil in the oil storage space can immerse the transmission shaft.

3. The protector of claim 1, wherein: The shape of the driven wheel is arranged in a circular truncated cone, the height of the driven wheel is equal to the height of the driving wheel, and the height of the transmission belt; two adjusting through holes are formed in the side wall of the oil storage space, and the oil storage space is connected with the external space through the two adjusting through holes respectively; the adjusting through hole comprises a first hole section and a second hole section, the first hole section is connected with the second hole section, the first hole section is connected with the external space, the second hole section is connected with the oil storage space, and the inner side wall of one side of the second hole section is coincided with the inner bottom wall of the oil storage space, and the first hole section and the inner side wall of the oil storage space are arranged at an angle; The immersion auxiliary structure further comprises: Two first adjusting members movably arranged in the two first hole sections respectively; Two second adjusting members movably arranged in the two second hole sections respectively, the second adjusting member can move into a part of the oil storage space; the end of the second adjusting member towards the oil storage space is arranged as an inclined surface, the distance between the side of the second adjusting member abutting against the inner bottom wall of the oil storage space and the transmission shaft is less than the distance between the side of the second adjusting member away from the inner bottom wall of the oil storage space and the transmission shaft, and the inclined surface can be used to abut against the driven wheel; and A filling medium arranged in the two adjusting through holes, and the filling medium is always located between the first adjusting member and the second adjusting member; The first adjusting member is used to move towards the second hole section when the pressure of the external space is greater than the pressure of the filling medium, so that the filling medium pushes the second adjusting member to move towards the driven wheel, and then the inclined surface pushes the driven wheel to move away from the inner bottom wall of the oil storage space, thereby reducing the transmission ratio between the driving wheel and the driven wheel, and finally speeding up the rotation speed of the impeller; the first adjusting member is used to move away from the second hole section when the pressure of the external space is less than the pressure of the filling medium, so that the filling medium pushes the second adjusting member to move away from the driven wheel, and then the driven wheel moves away from the inner bottom wall of the oil storage space, thereby increasing the transmission ratio between the driving wheel and the driven wheel, and finally slowing down the rotation speed of the impeller.

4. The protector of claim 3, wherein: The immersion auxiliary structure further comprises at least two sealing rings, one of which is arranged at one end of the first adjusting member away from the external space, and the other is arranged at one end of the second adjusting member away from the transmission shaft, and the two sealing rings are always located in the adjusting through hole.

5. The protector of claim 4, wherein: The driven wheel is provided with a mounting groove at the abutting position with the inclined surface; the immersion auxiliary structure further comprises a plurality of steel balls, which are rotatably arranged in the mounting groove.

6. The protector of claim 1, wherein, The inner bottom wall of the oil storage space is provided with a moving groove, the direction of the moving groove is consistent with the direction of one of the radii of the oil storage space, and the immersion auxiliary structure further comprises: a stabilizing member movably arranged in the moving groove; the stabilizing member is provided with an auxiliary hole, and the auxiliary member is arranged in the auxiliary hole; and a restoring member located at one end of the moving groove, one end of the restoring member is connected to the stabilizing member, and the other end is connected to the side wall of the moving groove; The restoring member is used to push the stabilizing member to move away from the transmission shaft when the driven wheel moves towards the inner bottom wall of the oil storage space, so as to drive the driven wheel to move away from the transmission shaft through the auxiliary member, and then the driven wheel abuts against the transmission belt, so that the driving wheel can drive the driven wheel to rotate through the transmission belt.

7. The protector of claim 6, wherein: The cross section of the stabilizing member can completely cover the cross section of the auxiliary member; the moving groove is provided with a fixing groove on the side wall in the radial direction, and the immersion auxiliary structure further comprises a fixing member, one end of the fixing member is arranged on the fixing groove, and the fixing member is used to prevent the stabilizing member from being separated from the moving groove.

8. The protector of claim 6, wherein: The shape of the stabilizing member is set as a cuboid or a square.

9. A submersible electric pump characterized by The submersible electric pump comprises the protector of the submersible electric pump according to any one of claims 1 to 8.

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