Submersible motor protector and submersible motor assembly

Abstract

The embodiment of the application relates to the technical field of submersible pumps, and particularly discloses a submersible motor protector and a submersible motor assembly, the submersible motor protector comprising a shell, a piston and a capsule, the shell being provided with a first cavity and a second cavity, the first cavity being used for communicating with a motor cavity of a motor, the piston being slidingly arranged in the shell, the first cavity and the second cavity being arranged on two sides of the piston respectively, the capsule being arranged in the shell, and the inside of the capsule communicating with the second cavity, and the inside of the capsule being used for storing fluid medium. In the above manner, the pressure change in the motor cavity is balanced by the cooperation of the piston and the capsule, and the first cavity and the second cavity are isolated by the piston, so that the risk of impurities entering the motor cavity through the protector is effectively reduced, and the reliability of the operation of the submersible motor is improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of submersible pump, in particular to a submersible motor protector and a submersible motor assembly. BACKGROUND

[0002] The submersible screw pump unit carries out crude oil exploitation in the oilfield underground environment, and its operation reliability is directly related to the production efficiency and economic benefit of the oilfield. Among them, the protector is an important part in the submersible screw pump, which is usually arranged at the upper end of the motor. The protector includes an upper protector, a high-thrust bearing set and a lower protector which are sequentially and communicatively arranged from top to bottom. The upper protector is connected with the pump body through a universal joint, and the lower protector is connected with the upper end of the motor.

[0003] The lower protector is used for balancing the pressure inside and outside the motor, preventing well fluid from entering the motor interior, and providing necessary buffer protection for the motor. The capsule in the lower protector is used for storing and supplementing the electric lubricating oil in the motor to cope with the volume change of the electric lubricating oil caused by factors such as temperature change and pressure fluctuation during the operation of the motor.

[0004] However, since the capsule of the lower protector is in communication with the interior of the motor, and the lower protector is connected with the high-thrust bearing set, when the high-thrust bearing set operates abnormally, metal debris and other impurities are easily generated. The metal debris and other impurities are easy to enter the interior of the motor through the lower protector, which reduces the insulation of the electric lubricating oil, thereby increasing the risk of motor failure. SUMMARY

[0005] In view of the above problems, the embodiment of the present application provides a submersible motor protector and a motor assembly, which overcomes the above problems or at least partially solves the above problems.

[0006] To solve the above technical problems, one technical scheme adopted by the present application is to provide a submersible motor protector, which comprises a shell, a piston and a capsule. The shell is provided with a first cavity and a second cavity. The first cavity is used for communication with a motor cavity of a motor. The piston is slidingly arranged in the shell. The first cavity and the second cavity are respectively arranged on both sides of the piston. The capsule is arranged in the shell, and the interior of the capsule is in communication with the second cavity. The interior of the capsule is used for storing fluid medium.

[0007] In some embodiments, the submersible motor protector further comprises an elastic member. The elastic member is located in the second cavity. One end of the elastic member is connected to the piston, and the other end of the elastic member away from the piston is connected to the shell.

[0008] In some embodiments, the submersible motor protector further comprises a connecting member fixed in the housing, and the connecting member is arranged at one end of the second cavity away from the first cavity, one end of the elastic member away from the piston is connected to one end of the connecting member, one end of the capsule is sleeved on one end of the connecting member away from the elastic member, and the connecting member is in communication with the interior of the second cavity and the interior of the capsule, respectively.

[0009] In some embodiments, the submersible motor protector further comprises a connecting pipe arranged in the interior of the capsule, one end of the connecting pipe is connected to the connecting member, and the other end of the connecting pipe away from the connecting member is connected to the housing, the connecting member is provided with a first channel, the connecting pipe is provided with a second channel, and the two ends of the first channel are in communication with the second cavity and the second channel, respectively, and the second channel is also in communication with the interior of the capsule.

[0010] In some embodiments, the housing is further provided with a third cavity arranged at one side of the second cavity away from the first cavity, the third cavity is in communication with the exterior of the housing, the connecting member is arranged between the second cavity and the third cavity, and the capsule is arranged in the third cavity.

[0011] In some embodiments, the submersible motor protector further comprises a bottom joint at least partially arranged in the housing, and the bottom joint is arranged at one end of the third cavity away from the second cavity, one end of the capsule away from the connecting member is sleeved on the bottom joint, and one end of the connecting pipe away from the connecting member is connected to the bottom joint.

[0012] In some embodiments, the bottom joint is provided with a third channel in communication with the second channel, and the submersible motor protector further comprises a fluid valve arranged in the bottom joint and in communication with the third channel, and the fluid valve is used for flowing fluid medium into the interior of the capsule.

[0013] In some embodiments, the bottom joint and / or the housing are further provided with an air inlet channel in communication with the third cavity.

[0014] In some embodiments, the submersible motor protector further comprises a one-way valve in communication with the second cavity, and the one-way valve is used for exhausting air from the second cavity.

[0015] In some embodiments, the submersible motor protector further comprises a first limit ring fixed in the shell, the first limit ring is located on the side of the piston away from the capsule, the first limit ring is used for axially limiting the piston, and / or the submersible motor protector further comprises a second limit ring fixed in the shell, one end of the connecting piece away from the capsule abuts against the second limit ring.

[0016] To solve the above technical problems, another technical scheme adopted by the present application is to provide a submersible motor assembly comprising a motor and the above-mentioned submersible motor protector, the motor is provided with a motor cavity, and the motor cavity is communicated with the first cavity of the submersible motor protector.

[0017] The beneficial effects of the embodiments of the present application are that, different from the prior art, the embodiments of the present application provide a submersible motor protector and a submersible motor assembly, the submersible motor protector comprises a shell, a piston and a capsule, the shell is provided with a first cavity and a second cavity, the first cavity is used for being communicated with a motor cavity of a motor, the piston is slidingly arranged in the shell, the first cavity and the second cavity are arranged on two sides of the piston respectively, the capsule is arranged in the shell, the inside of the capsule is communicated with the second cavity, and the inside of the capsule is used for storing a fluid medium. In the above manner, the embodiments of the present application balance the pressure change in the motor cavity through cooperation of the piston and the capsule, and the piston isolates the first cavity and the second cavity, effectively reducing the risk of impurities entering the motor cavity through the protector, and improving the reliability of the operation of the submersible motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0019] Figure 1 is a perspective view of the submersible motor protector provided by the embodiments of the present application;

[0020] Figure 2 is an exploded view of the submersible motor protector provided by the embodiments of the present application;

[0021] Figure 3 is an enlarged sectional view of the submersible motor protector provided by the embodiments of the present application;

[0022] Figure 4 is a perspective view of the submersible motor assembly provided by the embodiments of the present application;

[0023] Figure 5FIG. 1 is a sectional view of a submersible motor assembly according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] For the purpose of facilitating the understanding of the present application, the present application will be described in more detail with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", and similar expressions used in the present specification are for the purpose of illustration only.

[0025] Unless otherwise defined, all technical and scientific terms used in the present specification are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present specification are merely used to describe specific embodiments of the present application and are not intended to limit the present application. The term "and / or" used in the present specification includes any and all combinations of one or more related items.

[0026] Referring to Figures 1 to 3 , the submersible motor protector 100 comprises a housing 1, a piston 2 and a capsule 3, the piston 2 is slidingly arranged in the housing 1, and the capsule 3 is arranged in the housing 1. The housing 1 is provided with a first cavity 11 and a second cavity 12 on both sides of the piston 2, the first cavity 11 is used to communicate with the motor cavity of the motor, and the second cavity 12 communicates with the inside of the capsule 3. The inside of the capsule 3 is used to store fluid medium.

[0027] When the lubricating oil in the motor cavity expands in volume due to temperature rise caused by work or environment, since the first cavity 11 communicates with the motor cavity, the pressure in the first cavity 11 increases, which pushes the piston 2 to slide towards the second cavity 12. With the movement of the piston 2, the volume of the second cavity 12 gradually decreases, and since the second cavity 12 communicates with the inside of the capsule 3 used to store fluid medium, the fluid medium in the inside of the capsule 3 will be squeezed to make the capsule 3 elastically expand, thereby buffering the pressure change in the motor cavity caused by the temperature rise and the expansion of the lubricating oil, reducing the risk of damage to the motor caused by the over-high pressure in the motor cavity. Similarly, when the lubricating oil in the motor cavity shrinks in volume due to temperature drop, the pressure in the first cavity 11 decreases, and under the action of the pressure difference, the piston 2 slides towards the first cavity 11, the volume of the second cavity 12 increases, and the fluid medium in the inside of the capsule 3 flows to the second cavity 12 to make the capsule 3 compress, thereby maintaining the relative stability of the pressure in the motor cavity and reducing the risk of lubrication failure or loosening of motor parts caused by negative pressure due to the cavity in the motor cavity.

[0028] In some embodiments, referring to Figure 2 andFigure 3 The submersible motor protector further comprises a one-way valve 4, one end of which is in communication with the second cavity 12, and the one-way valve 4 is used for venting the second cavity 12. During the assembly of the submersible motor protector 100, when the interior of the capsule 3 and the second cavity 12 are filled with the fluid medium, the one-way valve 4 is used to discharge the excess gas so as to fill the interior of the capsule 3 and the second cavity 12 with the fluid medium.

[0029] In some embodiments, the one-way valve 4 is arranged on the piston 2, and the two ends of the one-way valve 4 are respectively directed towards the first cavity 11 and the second cavity 12. The one-way valve 4 is used for discharging the gas in the second cavity 12 into the first cavity 11 and then discharging the gas to the outside environment through the motor cavity, and preventing the lubricating oil in the first cavity 11 from flowing into the second cavity 12, so as to isolate the first cavity 11 and the second cavity 12.

[0030] The fluid medium is a liquid medium or a gas medium. In some embodiments, the fluid medium is a liquid medium which is the same as the composition of the lubricating oil in the motor cavity. In other embodiments, the fluid medium is an inert gas.

[0031] In some embodiments, the outside of the capsule 3 is in communication with the outside of the shell 1. On the one hand, due to the communication between the outside of the capsule 3 and the outside of the shell 1, the pressure of the outside environment acts on the capsule 3, which helps to limit the overexpansion of the capsule 3 and assist the compression of the capsule 3, thereby improving the reliability of the pressure adjustment of the capsule 3. On the other hand, when the pressure of the outside environment changes, the submersible motor protector 100 can quickly adjust the pressure in the motor cavity through the elastic deformation of the capsule 3 and the flow of the fluid medium in the interior, balance the pressure inside and outside the motor, and improve the reliability and service life of the motor under complex and variable oil well working conditions.

[0032] In some embodiments, referring to Figure 3 The shell 1 is further provided with a third cavity 13 which is arranged on the side of the second cavity 12 away from the first cavity 11, and the third cavity 13 is in communication with the outside of the shell 1. The shell 1 provides physical protection for the capsule 3, and reduces the risk of damage to the capsule 3 due to collision and friction.

[0033] In some embodiments, the shell 1 is provided with a through hole 14 which is in communication with the third cavity 13 and the outside of the shell 1, respectively. In some examples, the submersible motor protector 100 is arranged at the lower end of the motor. Compared with the protector arranged at the upper end of the motor, the through hole 14 for communicating the inside and outside of the submersible motor protector 100 is located at a lower position in the oil well, and the well fluid environment is more stable, thereby reducing the risk of well fluid impacting the through hole 14 and impurities entering the third cavity 13 to block the through hole 14, and further causing the imbalance of the pressure of the motor. Moreover, the through hole 14 can also be arranged to have a larger aperture, further reducing the risk of blocking the through hole 14.

[0034] In some embodiments, referring to Figure 2 and Figure 3The submersible motor protector 100 further comprises an elastic member 5 located in the second cavity 12. One end of the elastic member 5 is connected to the piston 2, and the other end of the elastic member 5 is connected to the shell 1, so as to disperse the pressure of the first cavity 11 on the piston 2 through the elastic member 5, facilitate the smooth movement of the piston 2, and enhance the stability.

[0035] In some embodiments, the submersible motor protector 100 further comprises a connecting member 6 fixed in the shell 1 and arranged at the end of the second cavity 12 away from the first cavity 11. The other end of the elastic member 5 is connected to one end of the connecting member 6, and one end of the capsule 3 is sleeved on the other end of the connecting member 6 away from the elastic member 5. The connecting member 6 respectively communicates the inside of the second cavity 12 and the inside of the capsule 3. The connecting member 6 is located between the elastic member 5 and the capsule 3 to axially limit the elastic member 5 and provide structural support for the capsule 3.

[0036] In some embodiments, the connecting member 6 is provided with a first channel 61, and the two ends of the first channel 61 respectively communicate the inside of the second cavity 12 and the inside of the capsule 3. The connecting member 6 is located between the elastic member 5 and the capsule 3 to axially limit the elastic member 5 and provide structural support for the capsule 3.

[0037] In some embodiments, one end of the capsule 3 is sleeved with a first fixing member 31 for fixing the one end of the capsule 3 to the connecting member 6. In some examples, the first fixing member 31 is a single-ear endless clamp.

[0038] In some embodiments, the elastic member 5 is a spring or a spring piece. In some examples, referring to Figure 2 , the elastic member 5 is a cylindrical spring, one end of the elastic member 5 is sleeved on the end of the piston 2 away from the first cavity 11, and the other end of the elastic member 5 is sleeved on one end of the connecting member 6.

[0039] In some embodiments, the submersible motor protector 100 further comprises a first limiting ring 21 fixed in the shell 1, the first limiting ring 21 is located on the side of the piston 2 away from the capsule 3, and the first limiting ring 21 is used to axially limit the piston 2. The first limiting ring 21 is used to limit the maximum stroke of the piston 2 away from the second cavity 12 by abutting.

[0040] In some embodiments, the axial distance between the first limiting ring 21 and the connecting member 6 is less than or equal to the natural length of the elastic member 5, so as to reduce the risk of the elastic member 5 being separated from the piston 2 and enable the elastic member 5 to exert a stable force on the piston 2.

[0041] In some embodiments, the shell 1 is provided with a first annular groove 15 on the inner surface of the first cavity 11, and the first limiting ring 21 is partially arranged in the first annular groove 15 to fix the first limiting ring 21 in the first annular groove 15.

[0042] In some embodiments, referring to Figure 2 and Figure 3 , the submersible motor protector 100 further comprises a connecting pipe 7 arranged inside the capsule 3. One end of the connecting pipe 7 is connected to the connecting member 6, and the other end of the connecting pipe 7 away from the connecting member 6 is connected to the shell 1. In some examples, the connecting pipe 7 is fixed to the end of the shell 1 away from the first cavity 11. The connecting pipe 7 is provided with a second channel 71, one end of the second channel 71 is communicated with one end of the first channel 61 away from the second cavity 12, and the second channel 71 is communicated with the inside of the capsule 3. The connecting pipe 7 provides certain structural support for the capsule 3, and axially limits one end of the connecting member 6, thereby axially limiting one end of the elastic member 5 away from the piston 2.

[0043] In some embodiments, the connecting pipe 7 is provided with a connecting hole 72, which is respectively communicated with the second channel 71 and the inside of the capsule 3.

[0044] In some embodiments, the submersible motor protector 100 further comprises a second limiting ring 62 fixed in the shell 1, and one end of the connecting member 6 away from the capsule 3 abuts against the second limiting ring 62, so that the second limiting ring 62 axially limits one end of the connecting member 6 away from the capsule 3. The second limiting ring 62 and the connecting pipe 7 respectively axially constrain the connecting member 6 from both ends, thereby enhancing the installation stability of the connecting member 6 in the shell 1.

[0045] In some embodiments, the shell 1 is provided with a second annular groove 16 on the inner surface of the second cavity 12, and the second limiting ring 62 is partially arranged in the second annular groove 16 to fix the second limiting ring 62 in the second annular groove 16.

[0046] In some embodiments, the submersible motor protector 100 further comprises a fluid valve 8 communicated with the second channel 71 or the inside of the capsule 3, and the fluid valve 8 is used for flowing fluid medium into the second channel 71 or the inside of the capsule 3.

[0047] In some embodiments, one end of the fluid valve 8 away from the outside of the shell 1 is provided with a first sealing plug 81, and the first sealing plug 81 is detachably arranged.

[0048] In some embodiments, the submersible motor protector 100 further comprises a bottom joint 9 at least partially arranged in the shell 1, and the bottom joint 9 is arranged at one end of the third cavity 13 away from the second cavity 12. One end of the capsule 3 away from the connecting member 6 is sleeved on the bottom joint 9, and both ends of the capsule 3 are respectively sleeved on the connecting member 6 and the bottom joint 9 to form a relatively closed internal space of the capsule 3, axially limit the capsule 3, and improve the maintainability of the capsule 3. One end of the connecting pipe 7 away from the connecting member 6 is connected to the bottom joint 9, so that the bottom joint 9 supports the connecting pipe 7.

[0049] In some embodiments, the bottom joint 9 is detachably connected with the shell 1, so as to facilitate installation of components inside the shell 1.

[0050] In some embodiments, the bottom joint 9 is provided with a third channel 91, and the fluid valve 8 is arranged in the bottom joint 9, and the third channel 91 respectively communicates with the second channel 71 and the fluid valve 8.

[0051] In some embodiments, at least part of the first channel 61, the second channel 71 and the third channel 91 extend along the axial direction of the shell 1 and are sequentially communicated.

[0052] In some embodiments, the capsule 3 is sleeved with a second fixing member 32 at an end away from the connecting member 6, and the second fixing member 32 is used for fixing the capsule 3 with the bottom joint 9. In some examples, the second fixing member 32 is a single-ear endless clamp.

[0053] In some embodiments, referring to Figure 3 , the bottom joint 9 is further provided with an air inlet channel 92, and the air inlet channel 92 is communicated with the third cavity 13. In the assembly process of the submersible motor protector 100, when filling the fluid medium into the inside of the capsule 3, the pressurized gas is filled into the third cavity 13 through the air inlet channel 92, so as to balance the pressure inside and outside the capsule 3, and reduce the risk of excessive deformation of the capsule 3.

[0054] In other embodiments, the air inlet channel 92 is arranged in the shell 1. In yet other embodiments, part of the air inlet channel 92 is arranged in the shell 1, and another part of the air inlet channel 92 is arranged in the bottom joint 9.

[0055] In some embodiments, an end of the air inlet channel 92 away from the third cavity 13 is provided with a second sealing plug 93, and the second sealing plug 93 is detachably arranged.

[0056] In some embodiments, the submersible motor protector 100 further comprises a first sealing ring 22. Along the circumference of the piston 2, the piston 2 is provided with a first sealing groove 23. The first sealing ring 22 is arranged in the first sealing groove 23, and the first sealing ring 22 is used for sealing the gap between the piston 2 and the inner surface of the shell 1.

[0057] In some embodiments, the submersible motor protector 100 further comprises a guide belt 24, and the guide belt 24 is annularly arranged on the outer circumference of the piston 2. The first sealing ring 22 is respectively provided with the guide belt 24 on both sides in the axial direction, and the guide belt 24 is used for improving the stability of the axial movement of the piston 2, so that the piston 2 can make more accurate and stable linear reciprocating motion. At the same time, the guide belt 24 bears the radial load, and reduces the risk of wear or jamming caused by direct contact between the piston 2 and the shell 1.

[0058] In some embodiments, the submersible motor protector 100 further comprises a second sealing ring 63. The connecting member 6 is provided with a second sealing groove 64 along the circumference of the connecting member 6. The second sealing ring 63 is arranged in the second sealing groove 64, and the second sealing ring 63 is used to seal the gap between the connecting member 6 and the inner surface of the shell 1.

[0059] In the embodiments of the present application, the submersible motor protector 100 cooperates with the capsule 3 and the slidingly arranged piston 2 to effectively balance the pressure change of the motor cavity, and the piston 2 separates the first cavity 11 and the second cavity 12, thereby reducing the risk of impurities entering the motor cavity through the protector 100 and improving the reliability and stability of the operation of the submersible motor.

[0060] The present application also provides an embodiment of a submersible motor assembly 200, please refer to Figure 4 and Figure 5 , the submersible motor assembly 200 comprises a motor 300 and the above-mentioned submersible motor protector 100, the motor 300 is provided with a motor cavity 301, and the motor cavity 301 is communicated with the first cavity 11 of the submersible motor protector 100. For the structure and function of the submersible motor protector 100, please refer to the above-mentioned embodiments, which will not be repeated here.

[0061] In some embodiments, one end of the motor 300 is provided with an output shaft, and the submersible motor protector 100 is arranged at the other end of the motor 300 away from the output shaft.

[0062] In some embodiments, the second cavity 12 in the shell 1 and the inside of the capsule 3 are used to store liquid medium, and the one-way valve 4 is arranged in the piston 2. In the assembly process of the submersible motor assembly 200, first, the end of the shell 1 provided with the first cavity 11 is connected with the motor 300, the first cavity 11 is communicated with the motor cavity 301, then the first limiting ring 21, the piston 2, the elastic member 5, the second limiting ring 62, the connecting member 6, the connecting pipe 7, the capsule 3 and the bottom joint 9 are sequentially installed in the shell 1, and then the lubricating oil is injected into the motor cavity 301, the lubricating oil flows downward into the first cavity 11, the piston 2 moves downward under the gravity of the lubricating oil, the elastic member 5 is compressed to provide upward pre-tightening force, and when the first cavity 11 and the motor cavity 301 are filled with lubricating oil, the oil injection of the motor 300 is stopped.

[0063] Then, the through hole 14 of the shell 1 is blocked by a blocking tool, the pressurized gas is injected into the gas inlet channel 92 of the bottom joint 9 by an external gas source, the pressurized gas flows into the third cavity 13, at the same time, the liquid medium is injected into the inside of the capsule 3 by the fluid valve 8, and the air pressure of the third cavity 13 is adjusted in real time, so that the inside and outside of the capsule 3 are balanced, and the risk of excessive deformation of the capsule 3 is reduced. The fluid medium gradually fills the inside of the capsule 3 from bottom to top and the second cavity 12, and then the gas in the second cavity 12 is discharged outward through the one-way valve 4. When the second cavity 12 is filled with the fluid medium, the injection of the liquid medium is stopped, the blocking tool is removed, the fluid valve 8 is closed by the first sealing plug 81, and the gas inlet channel 92 is closed by the second sealing plug 93.

[0064] In some embodiments, when the one-way valve 4 overflows the liquid medium into the first cavity 11, it is judged that the second cavity 12 is filled with the liquid medium, the overflowed liquid medium enhances the pressure at the upper end of the piston 2, and then the pressure is rebalanced through the elastic member 5 and the deformation of the capsule 3. The preset opening pressure value of the one-way valve 4 is greater than the maximum pressure of the liquid medium in the second cavity 12 on the piston 2 in the oil well, so that the one-way valve 4 is not opened in the oil well, and the piston 2 separates the first cavity 11 and the second cavity 12.

[0065] In other embodiments, the second cavity 12 and the inside of the capsule 3 are used to store gas medium, and the piston 2 bidirectionally separates the first cavity 11 and the second cavity 12. In the assembly process of the submersible motor assembly 200, the gas medium is injected into the inside of the capsule 3 through the fluid valve 8 at the same time, the through hole 14 of the shell 1 is blocked by the blocking tool, and the pressurized gas of the external gas source flows into the third cavity 13 through the gas inlet channel 92, so as to reduce the risk of excessive deformation of the capsule 3.

[0066] In the embodiments of the present application, the motor cavity 301 of the submersible motor assembly 200 is separated from the inside of the capsule 3 of the submersible motor protector 100 by the piston 2, which reduces the risk of impurities entering the motor cavity 301 through the protector 100 and improves the reliability of the submersible motor 300.

[0067] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but the present application can be implemented in many different forms, and is not limited to the embodiments described in the specification. These embodiments are not additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Furthermore, each of the above technical features continues to be combined, forming various embodiments not listed above, which are considered to be within the scope of the present application. Furthermore, those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes shall fall within the scope of the claims of the present application.

Claims

1. A submersible motor protector characterized by, The application relates to a submersible motor protector. The submersible motor protector comprises a shell, a piston, a capsule and an elastic member. The shell is provided with a first cavity and a second cavity, the first cavity is used for communicating with a motor cavity of a motor; The piston is slidably arranged in the shell, and the first cavity and the second cavity are arranged on two sides of the piston respectively; The capsule is arranged in the shell, and an inner part of the capsule communicates with the second cavity, and the inner part of the capsule is used for storing a fluid medium; The elastic member is arranged in the second cavity, and one end of the elastic member is connected to the piston; A connecting member is fixed in the shell, and the connecting member is arranged at one end of the second cavity away from the first cavity, one end of the connecting member connected to the elastic member away from the piston, one end of the capsule is sleeved on the connecting member away from the elastic member, and the connecting member respectively communicates with the second cavity and the inner part of the capsule.

2. The submersible motor protector according to claim 1, wherein the submersible motor protector further comprises a connecting pipe, the connecting pipe is arranged in the inner part of the capsule, one end of the connecting pipe is connected to the connecting member, and the other end of the connecting pipe away from the connecting member is connected to the shell; The connecting member is provided with a first channel, the connecting pipe is provided with a second channel, and the two ends of the first channel respectively communicate with the second cavity and the second channel, and the second channel further communicates with the inner part of the capsule.

3. The submersible motor protector according to claim 2, wherein the shell is further provided with a third cavity, the third cavity is arranged on the side of the second cavity away from the first cavity, and the third cavity communicates with the outside of the shell; The connecting member is arranged between the second cavity and the third cavity, and the capsule is arranged in the third cavity. The submersible motor protector further comprises a bottom joint, the bottom joint is at least partially arranged in the shell, and the bottom joint is arranged at one end of the third cavity away from the second cavity; 4. The electrical submersible motor protector of claim 3, wherein , One end of the capsule away from the connecting member is sleeved on the bottom joint, and one end of the connecting pipe away from the connecting member is connected to the bottom joint. The bottom joint is provided with a third channel, and the third channel communicates with the second channel; 5. The electrical submersible motor protector of claim 4, wherein , The submersible motor protector further comprises a fluid valve, the fluid valve is arranged in the bottom joint and communicates with the third channel, and the fluid valve is used for allowing the fluid medium to flow into the inner part of the capsule.

6. The submersible motor protector according to claim 4 or 5, wherein the bottom joint and / or the shell is further provided with an air inlet channel, and the air inlet channel communicates with the third cavity.

7. The submersible motor protector according to any one of claims 1-5, wherein the submersible motor protector further comprises a one-way valve, the one-way valve communicates with the second cavity, and the one-way valve is used for exhausting air from the second cavity.

8. The submersible motor protector according to any one of claims 1-5, wherein the submersible motor protector further comprises a first limiting ring, the first limiting ring is fixed in the shell, the first limiting ring is arranged on the side of the piston away from the capsule, and the first limiting ring is used for axially limiting the piston; and / or, ​ ​ ​ ​ The submersible motor protector further comprises a second limiting ring fixed in the shell, and an end of the connecting piece away from the capsule abuts against the second limiting ring.

9. A submersible motor assembly characterized by, including a motor and a submersible motor protector as claimed in any one of claims 1-8, The motor is provided with a motor cavity, and the motor cavity communicates with the first cavity of the submersible motor protector.

Images