Submersible motor protector and submersible motor assembly

Abstract

The embodiment of the invention relates to the technical field of oil-submerged pumps, and particularly discloses 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 arranged in the shell in a sliding mode, and the capsule is arranged in the shell; the first cavity and the second cavity are formed in the two sides of the piston respectively, the capsule is arranged on the shell, the interior of the capsule is communicated with the second cavity, and the interior of the capsule is used for storing a fluid medium. Through the above mode, the pressure change in the motor cavity is balanced through the cooperation of the piston and the capsule, and the piston separates the first cavity from the second cavity, so that the risk that impurities enter the motor cavity through the protector is effectively reduced, and the operation reliability of the submersible motor is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of submersible pumps, and in particular to a submersible motor protector and a submersible motor assembly. Background Art

[0002] Submersible screw pump units are used for crude oil extraction in the underground environment of oil fields, and their operating reliability is directly related to the production efficiency and economic benefits of the oil fields. Among them, the protector, as an important component of the submersible screw pump, is usually set at the upper end of the motor. The protector includes an upper protector, a high thrust bearing group and a lower protector that are connected in sequence from top to bottom. The upper protector is connected to the pump body through a universal joint, and the lower protector is connected to the upper end of the motor.

[0003] The lower protector is used to balance the pressure inside and outside the motor, prevent well fluid from invading the motor, and provide necessary buffer protection for the motor. The electric lubricant in the motor is stored and replenished through the expansion and contraction of the capsule in the lower protector to cope with the volume change of the electric lubricant caused by temperature changes, pressure fluctuations and other factors during the operation of the motor.

[0004] However, since the capsule of the lower protector is connected to the inside of the motor and the lower protector is connected to the high thrust bearing group, when the high thrust bearing group operates abnormally, impurities such as metal debris are generated. The metal debris and other impurities can easily enter the inside of the motor through the lower protector, reducing the insulation of the electrical lubricant and increasing the risk of motor failure. Summary of the invention

[0005] In view of the above problems, the embodiments of the present application provide a submersible motor protector and a motor assembly, which overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a submersible motor protector, including a shell, a piston and a capsule, the shell is provided with a first cavity and a second cavity, the first cavity is used to communicate with the motor cavity of the motor, the piston is slidably 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 communicated with the second cavity, and the interior of the capsule is used to store fluid medium.

[0007] In some embodiments, the submersible motor protector further comprises an elastic member, wherein the elastic member is located in the second chamber, one end of the elastic member is connected to the piston, and the end of the elastic member facing away from the piston is connected to the housing.

[0008] In some embodiments, the submersible motor protector further includes a connecting member, the connecting member is fixed inside the housing, and the connecting member is disposed at one end of the second cavity facing away from the first cavity. One end of the elastic member facing away from the piston is connected to one end of the connecting member, one end of the capsule is sleeved on the end of the connecting member facing away from the elastic member, and the connecting member communicates with the inside of the second cavity and the capsule respectively.

[0009] In some embodiments, the submersible motor protector further includes a connecting pipe, the connecting pipe is disposed inside the capsule, one end of the connecting pipe is connected to the connecting member, the end of the connecting pipe facing 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 both ends of the first channel communicate with the second cavity and the second channel respectively, and the second channel also communicates with the inside of the capsule.

[0010] In some embodiments, the housing is further provided with a third cavity, the third cavity is disposed on a side of the second cavity facing away from the first cavity, the third cavity communicates with the outside of the housing, the connecting member is disposed between the second cavity and the third cavity, and the capsule is disposed inside the third cavity.

[0011] In some embodiments, the submersible motor protector further includes a bottom joint, at least a part of the bottom joint penetrates inside the housing, and the bottom joint is disposed at one end of the third cavity facing away from the second cavity, one end of the capsule facing away from the connecting member is sleeved on the bottom joint, and the end of the connecting pipe facing away from the connecting member is connected to the bottom joint.

[0012] In some embodiments, the bottom joint is provided with a third channel, the third channel communicates with the second channel, the submersible motor protector further includes a fluid valve, the fluid valve is disposed on the bottom joint and communicates with the third channel, and the fluid valve is used for allowing a fluid medium to flow into the inside of the capsule.

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

[0014] In some embodiments, the submersible motor protector further includes a check valve, the check valve communicates with the second cavity, and the check valve is used for exhausting air from the second cavity.

[0015] In some embodiments, the submersible motor protector also includes a first limiting ring, which is fixed in the shell, and the first limiting ring is located on the side of the piston away from the capsule, and the first limiting ring is used to limit the axial position of the piston, and / or the submersible motor protector also includes a second limiting ring, which is fixed in the shell, and the end of the connecting member away from the capsule abuts against the second limiting ring.

[0016] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a submersible motor assembly, including a motor and the above submersible motor protector, wherein the motor is provided with a motor cavity, and the motor cavity is connected to the first cavity of the submersible motor protector.

[0017] The beneficial effect of the embodiment of the present application is as follows: Different from the prior art, the embodiment of the present application provides a submersible motor protector and a submersible motor assembly, the submersible motor protector includes a shell, a piston and a capsule, the shell is provided with a first cavity and a second cavity, the first cavity is used to communicate with the motor cavity of the motor, the piston is slidably 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 communicated with the second cavity, and the interior of the capsule is used to store fluid medium. In the above manner, the embodiment of the present application balances the pressure change in the motor cavity through the cooperation of the piston and the capsule, and the piston isolates the first cavity and the second cavity, which effectively reduces the risk of impurities entering the motor cavity through the protector and improves the reliability of the operation of the submersible motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use 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. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0019] Figure 1 is a three-dimensional diagram of a submersible motor protector provided in an embodiment of the present application; Figure 2 is an exploded view of a submersible motor protector provided in an embodiment of the present application; Figure 3 is an enlarged cross-sectional view of a submersible motor protector provided in an embodiment of the present application; Figure 4 is a stereoscopic diagram of a submersible motor assembly provided in an embodiment of the present application; Figure 5 It is a cross-sectional view of a submersible motor assembly provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] To facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are only for illustrative purposes.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in this specification in the description of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0022] Please refer to Figures 1 to 3 , the submersible motor protector 100 includes a housing 1, a piston 2 and a capsule 3. The piston 2 is slidably disposed in the housing 1, and the capsule 3 is disposed in the housing 1. A first chamber 11 and a second chamber 12 are respectively disposed on both sides of the piston 2 in the housing 1. The first chamber 11 is used to communicate with the motor chamber of the motor, and the second chamber 12 communicates with the inside of the capsule 3. The inside of the capsule 3 is used to store a fluid medium.

[0023] When the lubricating oil in the motor chamber expands in volume due to the increase in temperature caused by work or the environment, since the first chamber 11 communicates with the motor chamber, the pressure in the first chamber 11 increases accordingly, pushing the piston 2 to slide in the direction of the second chamber 12. As the piston 2 moves, the volume of the second chamber 12 gradually decreases. Since the second chamber 12 communicates with the inside of the capsule 3 for storing the fluid medium, the fluid medium inside the capsule 3 will be squeezed, causing the capsule 3 to expand elastically, thereby buffering the pressure change brought about by the increase in temperature and the expansion of the lubricating oil in the motor chamber, and reducing the risk of damage to the motor caused by excessive pressure in the motor chamber. Similarly, when the lubricating oil in the motor chamber contracts in volume due to the decrease in temperature, the pressure in the first chamber 11 decreases. Under the action of the pressure difference, the piston 2 slides in the direction of the first chamber 11, the volume of the second chamber 12 increases, and the fluid medium inside the capsule 3 flows into the second chamber 12, causing the capsule 3 to compress, thereby maintaining the relative stability of the pressure in the motor chamber and reducing the risk of the motor chamber having a cavity resulting in insufficient lubrication or the motor parts becoming loose due to negative pressure.

[0024] In some embodiments, please refer to Figure 2 and Figure 3The submersible motor protector further includes a one-way valve 4, one end of which is connected to the second chamber 12, and the one-way valve 4 is used to exhaust the second chamber 12. During the assembly process of the submersible motor protector 100, when the fluid medium is filled into the interior of the capsule 3 and the second chamber 12, the excess gas is exhausted through the one-way valve 4 so that the fluid medium fills the interior of the capsule 3 and the second chamber 12.

[0025] In some embodiments, a one-way valve 4 is disposed on the piston 2, with both ends of the one-way valve 4 facing the first chamber 11 and the second chamber 12 respectively. The one-way valve 4 is used to discharge the gas in the second chamber 12 into the first chamber 11 and then discharge it to the external environment through the motor chamber, and prevent the lubricating oil in the first chamber 11 from flowing into the second chamber 12, thereby isolating the first chamber 11 from the second chamber 12.

[0026] The fluid medium is a liquid medium or a gas medium. In some embodiments, the fluid medium is a liquid medium having the same composition as the lubricating oil in the motor cavity. In other embodiments, the fluid medium is an inert gas.

[0027] In some embodiments, the outer side of the capsule 3 is connected to the outer side of the shell 1. Since the outer side of the capsule 3 is connected to the outer side of the shell 1, on the one hand, the external environmental pressure acts on the capsule 3, which helps to limit the excessive expansion of the capsule 3 and assists the compression of the capsule 3, thereby improving the reliability of the pressure regulation of the capsule 3; on the other hand, when the external environmental pressure 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 internal fluid medium, balance the internal and external pressures of the motor, and improve the reliability and service life of the motor under complex and changeable oil well conditions.

[0028] In some embodiments, see Figure 3 The shell 1 is also 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 connected with the outside of the shell 1. The shell 1 provides physical protection for the capsule 3 and reduces the risk of the capsule 3 being damaged due to collision and friction.

[0029] In some embodiments, the housing 1 is provided with a through hole 14, which respectively connects the third chamber 13 and the outside of the housing 1. In some examples, the submersible motor protector 100 is provided at the lower end of the motor. Compared with the protector provided at the upper end of the motor, the through hole 14 for connecting 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 chamber 13 to block the through hole 14, thereby causing the motor pressure imbalance. In addition, the through hole 14 can also be set to a larger aperture to further reduce the risk of blocking the through hole 14.

[0030] In some embodiments, see Figure 2 and Figure 3The submersible motor protector 100 further includes an elastic member 5, which is located in the second chamber 12. One end of the elastic member 5 is connected to the piston 2, and the end of the elastic member 5 away from the piston 2 is connected to the housing 1, so that the pressure of the first chamber 11 on the piston 2 is dispersed through the elastic member 5, and the piston 2 is helped to move smoothly and enhance stability.

[0031] In some embodiments, the submersible motor protector 100 further includes a connector 6, which is fixed in the housing 1 and disposed at an end of the second chamber 12 away from the first chamber 11. An end of the elastic member 5 away from the piston 2 is connected to an end of the connector 6, and one end of the capsule 3 is sleeved on an end of the connector 6 away from the elastic member 5. The connector 6 communicates with the interior of the second chamber 12 and the capsule 3, respectively. The connector 6 is located between the elastic member 5 and the capsule 3 to limit the axial position of the elastic member 5 and provide structural support for the capsule 3.

[0032] In some embodiments, the connector 6 is provided with a first channel 61, and both ends of the first channel 61 are respectively connected to the second cavity 12 and the interior of the capsule 3. The connector 6 is located between the elastic member 5 and the capsule 3 to limit the axial position of the elastic member 5 and provide structural support for the capsule 3.

[0033] In some embodiments, one end of the capsule 3 is sleeved with a first fixing member 31, and the first fixing member 31 is used to fix one end of the capsule 3 to the connecting member 6. In some examples, the first fixing member 31 is a single-ear stepless clamp.

[0034] In some embodiments, the elastic member 5 is a spring or a spring. 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 chamber 11 , and the other end of the elastic member 5 is sleeved on one end of the connecting member 6 .

[0035] In some embodiments, the submersible motor protector 100 further includes a first limiting ring 21, which is fixed in the housing 1, and is located on the side of the piston 2 away from the capsule 3, and is used to limit the axial position of the piston 2. The first limiting ring 21 is used to limit the maximum stroke of the piston 2 away from the second chamber 12 by abutment.

[0036] 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 , thereby reducing the risk of the elastic member 5 being detached from the piston 2 and enabling the elastic member 5 to exert a stable force on the piston 2 .

[0037] In some embodiments, the housing 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 provided in the first annular groove 15 to fix the first limiting ring 21 in the first annular groove 15 .

[0038] In some embodiments, referring to Figure 2 and Figure 3 , the submersible motor protector 100 further includes a connecting pipe 7 disposed inside the capsule 3. One end of the connecting pipe 7 is connected to the connecting member 6, and the end of the connecting pipe 7 facing away from the connecting member 6 is connected to the housing 1. In some examples, the connecting pipe 7 is fixed to the end of the housing 1 facing away from the first chamber 11. The connecting pipe 7 is provided with a second channel 71, one end of the second channel 71 communicates with the end of the first channel 61 facing away from the second chamber 12, and the second channel 71 communicates 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 facing away from the piston 2.

[0039] In some embodiments, the connecting pipe 7 is provided with a connecting hole 72, and the connecting hole 72 communicates with the second channel 71 and the inside of the capsule 3 respectively.

[0040] In some embodiments, the submersible motor protector 100 further includes a second limiting ring 62 fixed inside the housing 1. One end of the connecting member 6 facing 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 facing away from the capsule 3. The second limiting ring 62 and the connecting pipe 7 axially constrain the connecting member 6 from both ends thereof, enhancing the installation stability of the connecting member 6 inside the housing 1.

[0041] In some embodiments, the inner surface of the housing 1 in the second chamber 12 is provided with a second annular groove 16, and a part of the second limiting ring 62 is disposed in the second annular groove 16 to fix the second limiting ring 62 in the second annular groove 16.

[0042] In some embodiments, the submersible motor protector 100 further includes a fluid valve 8, and the fluid valve 8 communicates with the second channel 71 or the inside of the capsule 3. The fluid valve 8 is used for allowing a fluid medium to flow into the second channel 71 or the inside of the capsule 3.

[0043] In some embodiments, a first sealing plug 81 is disposed at one end of the fluid valve 8 facing the outside of the housing 1, and the first sealing plug 81 is detachably disposed.

[0044] In some embodiments, the submersible motor protector 100 further includes a bottom joint 9, and at least a part of the bottom joint 9 penetrates into the housing 1, and the bottom joint 9 is disposed at the end of the third chamber 13 facing away from the second chamber 12. One end of the capsule 3 facing 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 and axially limit the capsule 3, and also improve the maintainability of the capsule 3. One end of the connecting pipe 7 facing away from the connecting member 6 is connected to the bottom joint 9 so that the bottom joint 9 supports the connecting pipe 7.

[0045] In some embodiments, the bottom joint 9 is detachably connected to the housing 1 to facilitate installation of components in the housing 1 .

[0046] In some embodiments, the bottom joint 9 is provided with a third channel 91 , the fluid valve 8 is provided at the bottom joint 9 , and the third channel 91 is connected to the second channel 71 and the fluid valve 8 , respectively.

[0047] In some embodiments, at least parts of the first channel 61 , the second channel 71 , and the third channel 91 extend along the axial direction of the housing 1 and are connected in sequence.

[0048] In some embodiments, a second fixing member 32 is sleeved on one end of the capsule 3 away from the connector 6, and the second fixing member 32 is used to fix the capsule 3 to the bottom connector 9. In some examples, the second fixing member 32 is a single-ear stepless clamp.

[0049] In some embodiments, see Figure 3 The bottom joint 9 is also provided with an air inlet passage 92, which is connected to the third chamber 13. During the assembly process of the submersible motor protector 100, when the fluid medium is filled into the capsule 3, pressurized gas is filled into the third chamber 13 through the air inlet passage 92 to balance the pressure inside and outside the capsule 3, so as to reduce the risk of excessive deformation of the capsule 3.

[0050] In some other embodiments, the air inlet passage 92 is disposed in the housing 1 . In some further embodiments, a portion of the air inlet passage 92 is disposed in the housing 1 , and another portion of the air inlet passage 92 is disposed in the bottom joint 9 .

[0051] In some embodiments, a second sealing plug 93 is provided at one end of the air inlet passage 92 away from the third chamber 13 , and the second sealing plug 93 is detachable.

[0052] In some embodiments, the submersible motor protector 100 further includes 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 provided in the first sealing groove 23, and the first sealing ring 22 is used to close the gap between the piston 2 and the inner surface of the housing 1.

[0053] In some embodiments, the submersible motor protector 100 also includes a guide belt 24, which is arranged on the outer periphery of the piston 2. The first sealing ring 22 is provided with guide belts 24 on both sides of the axial direction. The guide belt 24 is used to improve the stability of the axial movement of the piston 2 so that the piston 2 can perform linear reciprocating motion more accurately and smoothly. At the same time, the guide belt 24 bears radial loads to reduce the risk of wear or jamming caused by direct contact between the piston 2 and the housing 1.

[0054] In some embodiments, the submersible motor protector 100 further includes a second sealing ring 63. Along the circumference of the connecting member 6, a second sealing groove 64 is provided on the connecting member 6. The second sealing ring 63 is disposed 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 housing 1.

[0055] In the embodiments of the present application, the submersible motor protector 100 effectively balances the pressure change in the motor chamber through the cooperation of the capsule 3 and the slidably arranged piston 2, and the piston 2 isolates the first chamber 11 and the second chamber 12, reducing the risk of impurities entering the motor chamber through the protector 100 and improving the reliability and stability of the operation of the submersible motor.

[0056] 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 includes a motor 300 and the above-mentioned submersible motor protector 100. The motor 300 is provided with a motor chamber 301, and the motor chamber 301 communicates with the first chamber 11 of the submersible motor protector 100. For the structure and function of the submersible motor protector 100, reference can be made to the above embodiments, and details will not be described herein one by one.

[0057] In some embodiments, an output shaft is provided at one end of the motor 300, and the submersible motor protector 100 is disposed at the other end of the motor 300 away from the output shaft.

[0058] In some embodiments, the second chamber 12 inside the housing 1 and the inside of the capsule 3 are used to store a liquid medium, and the one-way valve 4 is disposed on the piston 2. During the assembly process of the submersible motor assembly 200, first, the end of the housing 1 provided with the first chamber 11 is connected to the motor 300, and the first chamber 11 communicates with the motor chamber 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 inside the housing 1. Then, lubricating oil is injected into the motor chamber 301, and the lubricating oil flows downward into the first chamber 11. The piston 2 moves downward under the gravity of the lubricating oil, and the elastic member 5 is compressed to provide an upward pre-tightening force. When the first chamber 11 and the motor chamber 301 are filled with lubricating oil, the oil injection into the motor 300 is stopped.

[0059] Then, block the through hole 14 of the housing 1 with a hole-blocking tool, inject pressurized gas into the air inlet passage 92 of the bottom joint 9 through an external air source. The pressurized gas flows into the third chamber 13. At the same time, inject a liquid medium into the interior of the capsule 3 through the fluid valve 8, and adjust the air pressure in the third chamber 13 in real time to balance the internal and external pressures of the capsule 3 and reduce the risk of excessive deformation of the capsule 3. The liquid medium gradually fills the interior of the capsule 3 and the second chamber 12 from bottom to top, and then the gas in the second chamber 12 is discharged outward through the one-way valve 4. When the second chamber 12 is filled with the liquid medium, stop injecting the liquid medium, remove the hole-blocking tool, seal the fluid valve 8 with the first sealing plug 81, and seal the air inlet passage 92 with the second sealing plug 93.

[0060] In some embodiments, when the liquid medium overflows from the one-way valve 4 into the first chamber 11, it is determined that the second chamber 12 is filled with the liquid medium. The overflowing liquid medium increases 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 chamber 12 on the piston 2 in the oil well, so that the one-way valve 4 does not open in the oil well, and the piston 2 isolates the first chamber 11 and the second chamber 12.

[0061] In other embodiments, the interior of the second chamber 12 and the capsule 3 are used to store the gas medium, and the piston 2 isolates the first chamber 11 and the second chamber 12 bidirectionally. During the assembly of the submersible motor assembly 200, while injecting the gas medium into the inner cavity of the capsule 3 through the fluid valve 8, block the through hole 14 of the housing 1 with a hole-blocking tool, and the pressurized gas from the external air source flows into the third chamber 13 after passing through the air inlet passage 92 to reduce the risk of excessive deformation of the capsule 3.

[0062] In the embodiment of the present application, in the submersible motor assembly 200, the motor cavity 301 and the interior of the capsule 3 of the submersible motor protector 100 are isolated by the piston 2, reducing the risk of impurities entering the motor cavity 301 through the protector 100 and improving the reliability of the submersible motor 300.

[0063] It should be noted that the description and drawings of the present application give preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not additional limitations to the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Furthermore, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as within the scope described in the specification of the present application; further, for those of ordinary skill in the art, modifications or changes can be made according to the above description, and all such modifications and changes should fall within the protection scope of the appended claims of the present application.

Claims

1. A submersible motor protector, characterized in that, Comprising: A housing, the housing is provided with a first chamber and a second chamber, and the first chamber is used to communicate with the motor chamber of the motor. A piston, slidably disposed within the housing, and the first chamber and the second chamber are respectively disposed on both sides of the piston. A capsule, disposed within the housing, and the interior of the capsule communicates with the second chamber, and the interior of the capsule is used to store a fluid medium.

2. The submersible motor protector according to claim 1, wherein The submersible motor protector further includes an elastic member, the elastic member is located in the second chamber, one end of the elastic member is connected to the piston, and the end of the elastic member facing away from the piston is connected to the housing.

3. The submersible motor protector according to claim 2, wherein The submersible motor protector further includes a connecting member, the connecting member is fixed within the housing, and the connecting member is disposed at one end of the second chamber facing away from the first chamber; One end of the elastic member facing away from the piston is connected to one end of the connecting member, one end of the capsule is sleeved on the end of the connecting member facing away from the elastic member, and the connecting member respectively communicates the second chamber and the interior of the capsule.

4. The submersible motor protector according to claim 3, wherein The submersible motor protector further includes a connecting pipe, the connecting pipe is disposed within the capsule, one end of the connecting pipe is connected to the connecting member, and the end of the connecting pipe facing 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, both ends of the first channel respectively communicate with the second chamber and the second channel, and the second channel also communicates with the interior of the capsule.

5. The submersible motor protector according to claim 4, wherein The housing is further provided with a third chamber, the third chamber is disposed on a side of the second chamber facing away from the first chamber, and the third chamber communicates with the outside of the housing; The connecting member is disposed between the second chamber and the third chamber, and the capsule is disposed within the third chamber.

6. The submersible motor protector according to claim 5, characterized in that , The submersible motor protector further includes a bottom joint, at least a part of the bottom joint penetrates into the housing, and the bottom joint is disposed at one end of the third chamber facing away from the second chamber; One end of the capsule facing away from the connecting member is sleeved on the bottom joint, and the end of the connecting pipe facing away from the connecting member is connected to the bottom joint.

7. The submersible motor protector according to claim 6, characterized in that , The bottom joint is provided with a third channel, and the third channel communicates with the second channel; The submersible motor protector further includes a fluid valve, the fluid valve is disposed on the bottom joint and communicates with the third channel, and the fluid valve is used to supply the fluid medium to flow into the interior of the capsule.

8. The submersible motor protector according to claim 6 or 7, wherein The bottom joint and / or the housing are further provided with an air inlet channel, and the air inlet channel communicates with the third chamber.

9. The submersible motor protector according to any one of claims 1-7, wherein The submersible motor protector further includes a check valve, the check valve communicates with the second chamber, and the check valve is used to exhaust air from the second chamber.

10. The submersible motor protector according to any one of claims 3 to 7, characterized in that: The submersible motor protector further comprises a first limiting ring, which is fixed in the housing, is located on a side of the piston away from the capsule, and is used to limit the axial position of the piston; and / or, The submersible motor protector further comprises a second limiting ring, which is fixed in the shell, and one end of the connecting member facing away from the capsule abuts against the second limiting ring.

11. A submersible motor assembly, characterized in that, It comprises a motor and a submersible motor protector as claimed in any one of claims 1 to 10, The motor is provided with a motor cavity, and the motor cavity is connected to the first cavity of the submersible motor protector.

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