Linear motor and oil extraction equipment

Abstract

The invention discloses a linear motor and oil extraction equipment, the linear motor comprises a stator module and a mover module, the stator module comprises a plurality of stator assemblies, each stator assembly comprises an outer sleeve, a lining pipe and a coil winding, and the coil windings and the lining pipes are arranged in the outer sleeves; the coil winding is sleeved on the lining pipe and is arranged between the outer sleeve and the lining pipe in a sealing manner; the mover module comprises a plurality of mover assemblies and a mover connecting sleeve, each mover assembly comprises a mover mandrel and a permanent magnet, the permanent magnets are arranged outside the mover mandrels, and oil liquid channels are formed in the mover mandrels; a through opening is formed in the side wall of each rotor connecting sleeve, every two adjacent rotor mandrels are connected together through the corresponding rotor connecting sleeve, and every two adjacent oil liquid channels are communicated through the corresponding rotor connecting sleeve. The rotor module is arranged in the stator module, the rotor mandrel can slide in the lining pipe, and an oil way gap is formed between the rotor module and the lining pipe. The use reliability of the linear motor and the oil extraction equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of mechanical technology, and in particular to a linear motor and oil production equipment. Background Art

[0002] With the continuous improvement of oil extraction technology and the increasing difficulty of extraction, higher requirements are placed on the oil extraction equipment used in oil extraction. At present, the effect of underground oil extraction is often achieved and the service life of the oil extraction equipment is improved by developing downhole submersible linear motor technology and oil pump technology.

[0003] The method of using linear motors for oil extraction is to place the oil pump in the oil well, and the linear motor drives the oil pump to operate to realize the oil extraction operation. For example: Chinese patent publication number CN112283063A discloses a machine-pump integrated oil extraction device and method, in which the stator part of the linear motor is assembled in the pump barrel, and the mover is used as a plunger. Under the action of the excitation magnetic field of the motor stator, the pump plunger moves back and forth to realize oil extraction. However, the pump barrel requires a certain strength, the wall thickness is thick, and the motor air gap is large, which affects the motor efficiency. In addition, the pump plunger is integrated in the motor mover and located in the motor stator. The pump plunger needs to cooperate with several ball valves built into the motor stator to realize oil extraction. The overall structure is complex and the oil extraction efficiency is low. Chinese patent publication number CN108880178 A discloses a multi-stage linear motor and its oil pump, which uses an independent linear motor and an oil pump. However, during use, the linear motor needs to apply thrust to the oil pump. Due to the limitation of the structural strength of the linear motor, the stroke of the linear motor is small and the oil extraction efficiency is low.

[0004] In view of this, how to design a technology to improve oil extraction efficiency is the technical problem to be solved by this application. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a linear motor and oil production equipment to improve the reliability of the oil production equipment and the oil extraction efficiency.

[0006] The technical solution provided by the present application is a linear motor, comprising: The stator module includes a plurality of stator components, the stator components include an outer sleeve, an inner sleeve and a coil winding, the coil winding and the inner sleeve are arranged in the outer sleeve, the coil winding is sleeved on the inner sleeve and sealed between the outer sleeve and the inner sleeve, and two adjacent outer sleeves are sealed and connected together; A mover module, the mover module includes a plurality of mover components and a mover connecting sleeve, the mover component includes a mover core shaft and a permanent magnet, the permanent magnet is arranged outside the mover core shaft, and an oil channel is formed inside the mover core shaft; a through hole is arranged on the side wall of the mover connecting sleeve, two adjacent mover core shafts are connected together through the mover connecting sleeve, and two adjacent oil channels are connected through the mover connecting sleeve; Among them, the mover module is arranged in the stator module, the mover core shaft can slide in the inner lining tube, and an oil path gap is formed between the mover module and the inner lining tube.

[0007] In one embodiment of the present application, the oil circuit gap is communicated with the oil channel.

[0008] In one embodiment of the present application, the oil channel is configured so that when the mover core shaft is in the downstroke movement, the oil flows upward in the oil channel; The oil passage gap is configured so that when the mover core shaft is in a downward stroke movement, oil flows upward in the oil passage gap.

[0009] In one embodiment of the present application, the oil channel is configured so that when the mover core shaft is in the upward stroke movement, the oil flows downward in the oil channel; The oil passage gap is configured so that when the mover core shaft is in an upward stroke movement, oil flows downward in the oil passage gap.

[0010] In one embodiment of the present application, the stator assembly further includes two end seals, and the end seals are provided with first mounting through holes; The end seal is inserted into the corresponding pipe opening of the outer sleeve in a sealing manner, and the end of the liner pipe is inserted into the first installation through hole in a sealing manner; The coil winding is located between the two end seals, and the mover core shaft passes through the first installation through hole.

[0011] In one embodiment of the present application, the stator module further includes a stator connector, and the stator connector is provided with a second mounting through hole; Two adjacent stator assemblies are sealed and fixedly connected together through a stator connector, the stator connector is sealed and connected to the end seals at the corresponding ends of the stator assembly, and the mover core shaft passes through the second installation through hole.

[0012] In one embodiment of the present application, a first wiring hole is provided on the end sealing member, and a second wiring hole is provided on the stator connecting member; For the end seal and the stator connector connected together, the first wiring hole is communicated with the second wiring hole; The cables connected to the coil winding pass through the first wiring hole and the second wiring hole; The stator module also includes a motor head and an external terminal. The motor head is also provided with a third installation through hole. The motor head is also provided with a wiring channel, and the external terminal is sealed and arranged in the wiring channel. The motor head is connected to the stator assembly at the top, and the third installation through hole is configured to allow the mover core shaft to pass through. The cables connected to the coil windings also extend into the wiring channel and are connected to external wiring terminals.

[0013] In one embodiment of the present application, a first key slot is further provided on the inner end surface of the end seal, a second key slot is provided on the stator core of the coil winding, the first key slot is connected to the second key slot, and the cables connected to the coil winding are also arranged in the first key slot and the second key slot.

[0014] In one embodiment of the present application, the stator module further includes: A pressure balancing assembly, the pressure balancing assembly comprises an outer protective tube and an oil pressure sensing component, and the oil pressure sensing component is arranged in the outer protective tube; A first pressure balance cavity is formed in the oil pressure sensing component, and the first pressure balance cavity is configured to be filled with electrical insulating oil; the oil pressure sensing component is configured to be deformed by the hydraulic pressure in the outer protective tube to adjust the pressure in the first pressure balance cavity; A second pressure balance chamber is formed between the outer sleeve and the inner liner, and the second pressure balance chamber is configured to be filled with electrical insulating oil; Wherein, the first pressure balance chamber and the second pressure balance chamber are communicated.

[0015] In one embodiment of the present application, the pressure balance assembly is disposed between two adjacent stator assemblies, and the mover core shaft of at least one mover assembly is inserted into the outer sleeve; Alternatively, the pressure balancing component is arranged on the stator component at the lower end of the stator module, and the mover core shaft of at least one mover component is inserted into the outer sleeve.

[0016] In one embodiment of the present application, the first pressure balance chamber is communicated with the second pressure balance chamber respectively; Alternatively, two adjacent second pressure-balancing chambers are communicated with each other, and the first pressure-balancing chamber is communicated with the second pressure-balancing chamber in the bottom movable subassembly.

[0017] In one embodiment of the present application, the stator assembly further includes two end seals, and the end seals are provided with first mounting through holes; The end seal is inserted into the corresponding pipe opening of the outer sleeve, and the end seal of the inner liner is inserted into the first installation through hole; the outer sleeve and the inner liner form a second pressure balance cavity between the two end seals, the coil winding is located between the two end seals, and the mover core shaft passes through the first installation through hole; In one embodiment of the present application, a first pressure communication hole is further provided on the end seal, and the first pressure communication hole is connected to the second pressure balance cavity; In two stator assemblies connected together, a first pressure communication hole in one stator assembly is communicated with an adjacent first pressure communication hole in another stator assembly.

[0018] In one embodiment of the present application, the stator module further includes a stator connector, the stator connector is provided with a second installation through hole, and the stator connector is also provided with a second pressure communication hole; Two adjacent stator assemblies are sealed and fixedly connected together through a stator connector, the stator connector is sealed and connected to the end seals of the corresponding ends of the stator assembly, and the mover core shaft passes through the second installation through hole; With the end seal and the stator connection member connected together, the first pressure communication hole is communicated with the second pressure communication hole.

[0019] In one embodiment of the present application, the stator module further includes a motor head and an external terminal, and the motor head is further provided with a third mounting through hole, a wiring channel and an oil injection hole, the oil injection hole and the wiring channel are arranged on the outside of the third mounting through hole, and the external terminal is sealed and arranged in the wiring channel; the motor head is connected to the stator assembly at the top, and the third mounting through hole is configured to allow the mover core shaft to pass through; The cables connected to the coil windings also extend into the wiring channel and are connected to the external wiring terminals; The oil filling hole is connected to the adjacent second pressure balance cavity.

[0020] In one embodiment of the present application, the linear motor further comprises an upper buffer oil pipe and / or a lower buffer oil pipe; the upper buffer oil pipe is arranged at the top of the stator module, and the lower buffer oil pipe is arranged at the bottom of the stator module; the upper buffer oil pipe is configured to communicate with the upper mover core shaft, and the lower buffer oil pipe is configured to communicate with the lower mover core shaft; And / or, the mover module also includes a lower buffer connection assembly, which includes two lower mounting seats and a lower spring, the lower spring is connected between the two lower mounting seats, the upper lower mounting seat is connected to the mover core shaft at the bottom, and the lower mounting seat at the bottom is configured to be connected to the oil pump.

[0021] The present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, the oil pump is arranged below the linear motor, the linear motor is arranged vertically, and the mover core shaft of the mover assembly located at the bottom of the linear motor is connected to the oil pump.

[0022] The present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, wherein the linear motor is arranged horizontally, the oil pump is arranged at the rear end of the linear motor, and the rotor core shaft of the rotor assembly located at the rear end of the linear motor is connected to the oil pump.

[0023] Compared with the prior art, the advantages and positive effects of the present application are: by sealing the stator assembly into the mounting sleeve, an auxiliary flow channel is formed between the stator assembly and the mounting sleeve, and an oil channel is formed in the movable core shaft of the movable module, and the auxiliary flow channel and the oil channel are interconnected. During use, the oil pump is connected to the bottom of the movable core shaft of the movable module, and the movable core shaft will provide pulling force to the oil pump to lift the oil upward. In this way, the requirements for the structural strength of the movable core shaft can be reduced, and the reciprocating stroke of the movable core shaft can be extended to meet the use requirements of oil pumps with different strokes, expand the scope of use, make the working state of the oil pump more reasonable and reliable, can operate stably for a long time, improve the oil pumping volume and oil pumping efficiency, and extend the pump inspection cycle.

[0024] In addition, the oil channel formed in the core shaft of the mover and the auxiliary flow channel between the outer sleeve and the mounting sleeve can allow the oil extracted by the oil pump to flow upward. At the same time, the oil can flow between the oil channel and the auxiliary flow channel according to the pressure difference of the oil pressure. In this way, during the reciprocating operation of the mover assembly, the oil can flow between the oil channel and the auxiliary flow channel. On the one hand, the flowing oil can absorb heat and cool down to improve the operating reliability of the linear motor. On the other hand, the flowing oil can reduce the resistance and pressure generated during the upward stroke of the mover assembly, and can also provide a certain damping force to the mover assembly when the mover assembly is descending, so as to improve the stability and smoothness of the operation.

[0025] In addition, the linear motor has the ability to withstand high pressure in terms of structural design, mechanical strength and sealing performance, and can meet the high-pressure working environment of pumping oil in oil wells. The oil pump is installed at the bottom or rear of the linear motor. The linear motor can work both in the submerged state and in the state of being separated from the well fluid. When the well fluid is lifted to the ground, the motor rotor and the oil pump plunger are subjected to tensile stress. The force bearing method is reasonable and the system is stable. The linear motor works in the state of being separated from the well fluid, which means that the linear motor is installed in the oil well and the pump is submerged above the liquid surface. This can also ensure that the cable is completely separated from the long-term immersion in the well fluid, thereby extending the service life of the cable.

[0026] In addition, the tubular oil pump or rod oil pump currently widely used in oil fields can be used in conjunction with the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 This is a schematic diagram of the structure of a linear motor embodiment of the present application; Figure 2 A cross-sectional view of an embodiment of a linear motor of the present application; Figure 3 for Figure 2 A partial enlarged schematic diagram of the middle A area; Figure 4 for Figure 2 A partial enlarged schematic diagram of the middle B area; Figure 5 for Figure 1 Assembly drawing of the stator assembly, stator connector and motor head; Figure 6 for Figure 1 A cross-sectional view of the stator assembly; Figure 7 for Figure 1 A schematic diagram of the partial structure of the stator assembly and the stator connector; Figure 8 for Figure 7 A schematic diagram of the structure of the middle end seal; Fig. 9 for Figure 1 A schematic diagram of the structure of the stator connector; Fig.10 It is a schematic diagram of the assembly of the mover assembly and the mover connector; Fig.11 for Fig.10 An assembly cross-sectional view of the middle mover assembly and the mover connector; Fig.12 for Fig.10 Structural schematic diagram of the middle mover connection; Fig.13 for Figure 1 A schematic diagram of the structure of the pressure balance assembly; Fig.14 for Figure 1 Cross-sectional view of the pressure balance assembly.

[0029] Reference numerals: 1. Stator module; 11. Stator assembly; 12. Stator connector; 13. Motor head; 14. External terminal; 15. Pressure balance assembly; 10. Oil circuit clearance; 111, outer sleeve; 112, inner liner; 113, coil winding; 114, end seal; 115, second pressure balance chamber; 1141, first installation through hole; 1142, first wiring hole; 1143, first keyway; 1144, first pressure communication hole; 1131, second keyway; 121, second installation through hole; 122, second wiring hole; 123, second pressure communication hole; 131. Wiring channel; 132. Oil filling hole; 151. outer protective tube; 152. oil pressure sensing component; 153. first pressure balance chamber; 2. mover module; 21. mover assembly; 22. mover connecting sleeve; 23. lower buffer connecting assembly; 211, mover core shaft; 212, permanent magnet; 213, oil channel; 221, through-mouth; 231, lower mounting seat; 232, lower spring; 3. Lower the cache oil pipe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] like Figure 1-Figure 14 As shown, an embodiment of the present application provides a linear motor, comprising: A stator module 1, the stator module 1 comprises a plurality of stator assemblies 11, the stator assembly 11 comprises an outer sleeve 111, an inner sleeve 112 and a coil winding 113, the coil winding 113 and the inner sleeve 112 are arranged in the outer sleeve 111, the coil winding 113 is sleeved on the inner sleeve 112 and is sealed between the outer sleeve 111 and the inner sleeve 112, and two adjacent outer sleeves 111 are sealed and connected together; The mover module 2 includes a plurality of mover components 21 and a mover connecting sleeve 22. The mover component 21 includes a mover core shaft 211 and a permanent magnet 212. The permanent magnet 212 is arranged outside the mover core shaft 211, and an oil channel 213 is formed inside the mover core shaft 211. A through hole 221 is arranged on the side wall of the mover connecting sleeve 22. Two adjacent mover core shafts 211 are connected together through the mover connecting sleeve 22, and two adjacent oil channels 213 are connected through the mover connecting sleeve 22. The mover module 2 is disposed in the stator module 1 , the mover core shaft 211 can slide in the inner liner tube 112 , and an oil path gap 10 is formed between the mover module 2 and the inner liner tube 112 .

[0032] Specifically, the linear motor provided in the present application is equipped with a mover module 2 in a stator module 1, and the coil winding 113 in the stator module 1 is energized to cooperate with the permanent magnet 212 in the mover module 2 to enable the permanent magnet 212 to drive the mover core shaft 211 to move back and forth in the stator module 1.

[0033] For the stator module 1, the outer sleeve 111 is used as an external support and protection component. The thickness of the outer sleeve 111 needs to meet the requirements of pressure resistance and structural strength. The inner liner 112 and the coil winding 113 are installed in the outer sleeve 111. The coil winding 113 will be located in the sealed space formed between the outer sleeve 111 and the inner liner 112, so that the coil winding 113 is insulated and isolated from the oil. Among them, the inner protective tube is made of non-magnetic material to ensure that sufficient magnetic force is generated between the coil winding 113 and the permanent magnet 212.

[0034] For the mover module 2, the mover core shaft 211 is used as a support and mounting component, and the permanent magnet 212 is mounted and fixed on the outside of the mover core shaft 211. The inside of the mover core shaft 211 is a hollow structure to form an oil channel 213, so that when the mover core shaft 211 drives the oil pump at the bottom to work, the oil pumped by the oil pump can be transported upward through the mover core shaft 211 to achieve the transportation of the oil to the ground.

[0035] When the mover core shaft 211 drives the oil pump to work, the mover core shaft 211 will provide a pulling force to the oil pump so that the oil pump pumps oil into the oil channel 213. The mover core shaft 211 can provide a large pulling force, thereby meeting the use requirements of a high-power oil pump.

[0036] The oil flowing in the oil channel 213 in the mover core shaft 211 can also flow into the oil path gap 10 through the through-hole 221 , and during use, the oil can flow between the oil path gap 10 and the oil channel 213 .

[0037] During use, the oil in the oil gap 10 can also carry away the heat generated by the coil winding 113 at the corresponding position by heat exchange with the inner lining tube 112, thereby improving the reliability of the linear motor.

[0038] The flow cross-sectional area of ​​the oil channel 213 is much larger than the flow cross-sectional area of ​​the oil gap 10. During use, the oil flows between the oil gap 10 and the oil channel 213, which can improve the smooth operation of the mover assembly 21 and effectively reduce the internal pressure.

[0039] Among them, when the movable core shaft 211 is in the downward stroke movement, the movable component 21 drives the plunger of the oil pump used in conjunction with the present application to move downward, and the oil that enters the oil pump barrel and is located at the lower part of the plunger is squeezed into the pump barrel above the plunger to prepare for the next oil pumping. At this time, the oil in the lower buffer oil pipe 3 flows upward in the oil channel 213 relative to the movable core shaft 211; the oil flows upward in the oil circuit gap 10 relative to the inner liner pipe 112, and the flow direction of the oil conforms to the principles of thermodynamics. The upward flowing oil fully absorbs the heat generated by the linear motor when it is working in the process of flowing through the linear motor, and brings the heat to the front oil pipe of the motor head 13, and is continued to be pushed toward the wellhead during the next oil pumping process.

[0040] In addition, when the movable core shaft 211 is in the upward stroke movement, the movable assembly 21 drives the oil pump plunger upward, and lifts the oil in the pump barrel above the oil pump plunger to the lower buffer oil pipe 3. At the same time, when the front part of the movable assembly 21 that is moving upward enters the oil pipe space in front of the motor head 13, it pushes the oil in the oil pipe space to flow toward the wellhead. Because the diameter of the movable assembly 21 is slightly larger than the diameter of the oil pump plunger, a small amount of oil flows downward relative to the movable core shaft 211 in the oil channel 213; a small amount of oil flows downward relative to the inner liner 112 in the oil path gap 10 and flows into the lower buffer oil pipe 3. The volume of this part of the oil flowing downward offsets the volume difference between the movable assembly 21 and the oil pump plunger of the same stroke. Therefore, in the upward stroke movement, the force on the movable assembly 21 is only the resistance of the oil pump plunger moving upward.

[0041] As described above, the linear motor rotor assembly 21 drives the lower oil pump plunger to continuously pump the oil in the oil well from the deep oil layer to the surface wellhead in a regular upward and downward reciprocating motion, thereby realizing a complete and efficient oil production process. Since the pumped oil fully absorbs the heat of the linear motor, the oil temperature is higher than that of conventional oil production methods, and wax deposition and freezing will not occur in the oil pipe.

[0042] In one embodiment of the present application, the stator assembly 11 further includes two end seals 114 , and the end seals 114 are provided with first mounting through holes 1141 ; The end seal 114 is sealably inserted into the corresponding pipe opening of the outer sleeve 111, and the end of the liner pipe 112 is sealably inserted into the first installation through hole 1141; The coil winding 113 is located between the two end seals 114 , and the mover core shaft 211 passes through the first installation through hole 1141 .

[0043] Specifically, in order to facilitate the sealed installation of the coil winding 113 in the stator assembly 11, end seals 114 are correspondingly provided at both ends of the stator assembly 11. The end seals 114 can seal and connect the outer sleeve 111 and the inner liner 112 at the corresponding end positions, thereby enabling the coil winding 113 to be sealed and assembled between the outer sleeve 111 and the inner liner 112.

[0044] The sealing method between the end seal 114 and the outer sleeve 111 and the inner liner 112 can be welding or adding a sealing ring, etc., which is not limited here.

[0045] Furthermore, the stator module 1 further includes a stator connector 12, and the stator connector 12 is provided with a second mounting through hole 121; Two adjacent stator assemblies 11 are sealed and fixedly connected together via a stator connector 12 . The stator connector 12 is sealed and connected to the end seals 114 at the corresponding ends of the stator assemblies 11 . The mover core shaft 211 passes through the second installation through hole 121 .

[0046] Specifically, for two adjacent stator assemblies 11, in order to facilitate and quickly connect, the two adjacent stator assemblies 11 are connected and fixed by a stator connector 12. The stator connector 12 can be connected to the end seals 114 at the corresponding ends of the stator assembly 11 by bolts or the like.

[0047] Furthermore, in order to facilitate the power supply of each coil winding 113 through a cable, a first wiring hole 1142 is provided on the end seal 114, and a second wiring hole 122 is provided on the stator connector 12; For the end seal 114 and the stator connector 12 connected together, the first wiring hole 1142 is connected with the second wiring hole 122; The cables connected to the coil winding 113 pass through the first wiring hole 1142 and the second wiring hole 122; The stator module 1 further includes a motor head 13 and an external terminal 14. The motor head 13 is further provided with a third mounting through hole. The motor head 13 is further provided with a wiring channel 131. The external terminal 14 is sealed and arranged in the wiring channel 131. The motor head 13 is connected to the stator assembly 11 at the top. The third mounting through hole is configured to allow the mover core shaft 211 to pass through. The cables connected to the coil winding 113 also extend into the wiring channel 131 and are connected to the external connection terminal 14 .

[0048] Specifically, in order to power the coil windings 113 in the stator module 1, the external power source is connected to the coil windings 113 in different stator components 11 through cables to realize power supply. Among them, since the overall length of the stator module 1 is relatively long, in order to facilitate the arrangement of cables, a motor head 13 is provided on the top stator component 11, and an external connection terminal 14 is provided on the motor head 13, which is connected to the external power supply through the external connection terminal 14. For the inside of the stator module 1, the cable extends into the wiring channel 131 and is connected to the external connection terminal 14.

[0049] In this way, between two adjacent stator assemblies 11 , cables can be routed through the first wiring hole 1142 and the second wiring hole 122 , and the motor head 13 at the top can be powered by the external terminal 14 and electrically connected to the cables in the wiring channel 131 .

[0050] In one embodiment, in order to facilitate the positioning of the coil winding 113 in the stator assembly 11 and to facilitate the wiring inside the stator assembly 11, a first keyway 1143 is further provided on the inner end surface of the end seal 114, and a second keyway 1131 is provided on the stator core of the coil winding 113. The first keyway 1143 is connected to the second keyway 1131, and a positioning key (not shown) is provided in the second keyway 1131, and the end of the positioning key is inserted into the first keyway 1143.

[0051] Specifically, inside the stator assembly 11, the cable is led through the first wiring hole 1142 of the end seal 114, and the cable needs to be accurately connected with the coil windings 113 stacked in sequence. To this end, the coil windings 113 stacked in sequence need to be accurately positioned, and a second keyway 1131 is provided on the stator core of the coil winding 113, and a positioning key is used to accurately position the multiple coil windings 113. At the same time, the end of the positioning key is also inserted into the first keyway 1143 of the end seal 114, so as to achieve high-precision relative positions between the end seal 114 and the coil winding 113, thereby facilitating accurate cable routing during assembly.

[0052] In another embodiment of the present application, the stator module 1 further includes: The pressure balancing assembly 15 includes an outer protective tube 151 and an oil pressure sensing component 152. The oil pressure sensing component 152 is disposed in the outer protective tube 151; A first pressure balance cavity 153 is formed in the oil pressure sensing component 152, and the first pressure balance cavity 153 is configured to be filled with electrical insulating oil; the oil pressure sensing component 152 is configured to be deformed by the hydraulic pressure in the outer protective tube 151 to adjust the pressure in the first pressure balance cavity 153; A second pressure balance chamber 115 is formed between the outer sleeve 111 and the inner liner 112 , and the second pressure balance chamber 115 is configured to be filled with electrical insulating oil; The first pressure balance chamber 153 and the second pressure balance chamber 115 are in communication.

[0053] Specifically, in order to reduce the overall peripheral size of the linear motor, the outer sleeve 111 needs to be made of thicker material to meet the structural strength requirements, while the inner liner tube 112 is as thin as possible to reduce the overall peripheral size.

[0054] However, due to the on-site working conditions of oil production, the linear motor needs to dive to a deeper stratum. Affected by the bottom oil pressure, the inner liner 112 needs to withstand the oil pressure in the oil gap 10. The thinner inner liner 112 will be damaged due to the low structural strength. After adding the pressure balance component 15, the first pressure balance cavity 153 formed by the pressure balance component 15 is connected to the adjacent second pressure balance cavity 115, and the two adjacent second pressure balance cavities 115 are also connected to each other. Under the action of the internal electrical insulating oil, the pressure of the first pressure balance cavity 153 can be basically the same as the pressure of different second pressure balance cavities 115.

[0055] In this way, during use, the oil pressure sensing component 152 will produce corresponding deformation due to the pressure of the oil in the outer protective tube 151, so that the pressure of the electrical insulating oil in the first pressure balance cavity 153 is basically the same as the pressure of the oil in the outer sheath. In this way, the pressure of the electrical insulating oil in the different second pressure balance cavity 115 can be close to the oil pressure in the oil circuit gap 10, so that the structural strength of the thinner inner lining tube 112 itself can meet the use requirements of the pressure difference on both sides, thereby improving the safety and reliability of the linear motor and meeting the design requirements of miniaturization of the outer peripheral size of the linear motor.

[0056] Among them, for the oil pressure sensing component 152, it can be a pressure capsule filled with electrical insulating oil, which is attached to the inner wall of the outer protective tube 151 and located on the outside of the movable subassembly 21. Alternatively, the oil pressure sensing component 152 includes a support tube and an elastic tube, the two ends of the support tube and the elastic tube are sealed and connected together to form a first pressure balance cavity 153, and the oil pressure sensing component 152 is sleeved on the outside of the movable subassembly 21, and the elastic tube is deformed by the oil pressure on the outside to achieve a smaller difference between the second pressure balance cavity 115 and the oil pressure on the outside. The specific structural form of the oil pressure sensing component 152 is not limited or elaborated here.

[0057] In one embodiment, the pressure balance assembly 15 is disposed between two adjacent stator assemblies 11, and the mover core shaft 211 of at least one mover assembly 21 is inserted into the outer sleeve 111. In this case, the two adjacent second pressure balance chambers 115 are interconnected, and the first pressure balance chamber 153 is respectively interconnected with the second pressure balance chamber 115.

[0058] Alternatively, the pressure balancing assembly 15 is disposed on the stator assembly 11 at the lower end of the stator module 1, and the mover core shaft 211 of at least one mover assembly 21 is inserted into the outer sleeve 111. In this case, two adjacent second pressure balancing cavities 115 are connected to each other, and the first pressure balancing cavity 153 is connected to the second pressure balancing cavity 115 in the mover assembly 21 at the bottom.

[0059] Specifically, in order to facilitate the wiring and installation of cables, an example is given in which the pressure balancing assembly 15 is arranged on the stator assembly 11 at the bottom.

[0060] During use, after the linear motor is placed in the oil well, the pressure balance component 15 is arranged next to the oil pump at the bottom. The oil pumped by the oil pump will first flow into the pressure balance component 15 and then flow through each stator component 11 in turn. The oil pressure sensing component 152 adjusts the internal electrical insulating oil pressure according to the external oil pressure to ensure the reliable operation of the linear motor.

[0061] Furthermore, the stator assembly 11 further includes two end seals 114 , and the end seals 114 are provided with first mounting through holes 1141 ; The end seal 114 is sealably inserted into the corresponding pipe opening of the outer sleeve 111, and the end seal of the inner liner tube 112 is sealably inserted into the first mounting through hole 1141; the outer sleeve 111 and the inner liner tube 112 form a second pressure balance cavity 115 between the two end seals 114, the coil winding 113 is located between the two end seals 114, and the rotor core shaft 211 passes through the first mounting through hole 1141.

[0062] Specifically, the outer sleeve 111 and the inner sleeve 112 in the stator assembly 11 are sealed and connected by the end seal 114 to form a second pressure balance cavity 115. In order to achieve mutual communication between the second pressure balance cavities 115, a first pressure communication hole 1144 is provided on the end seal component, and the first pressure communication hole 1144 is communicated with the second pressure balance cavity 115.

[0063] Specifically, the electrical insulating oil in the second pressure balancing cavity 115 can enter and exit through the first pressure connecting hole 1144 , so that the electrical insulating oil can be used to balance the pressure in the second pressure balancing cavity 115 at different positions.

[0064] Among the two stator assemblies 11 connected together, the first pressure communication hole 1144 in one stator assembly 11 is connected with the adjacent first pressure communication hole 1144 in the other stator assembly 11. In addition, for the stator assembly 11 adjacent to the pressure balance assembly 15, the stator assembly 11 is connected with the first pressure balance cavity 153 of the pressure balance assembly 15 through the first pressure communication hole 1144.

[0065] In addition, for the first keyway 1143 arranged on the end seal 114, the first keyway 1143 extends on the end face of the end seal 114, one end of the first keyway 1143 extends to the first mounting through hole 1141 and is connected to the first mounting through hole 1141, and the other end of the first keyway 1143 extends to the outer wall of the end seal 114, and at the same time, the first pressure connecting hole 1144 is located in the first keyway 1143.

[0066] In this way, after assembly, the electrical insulating oil in the first pressure balance cavity can enter and exit the first pressure communication hole 1144 via the transversely arranged first key slot 1143 to ensure smooth flow of the internal electrical insulating oil between different pressure balance cavities.

[0067] Furthermore, the stator module 1 further includes a stator connector 12, the stator connector 12 is provided with a second installation through hole 121, and the stator connector 12 is also provided with a second pressure communication hole 123; Two adjacent stator assemblies 11 are sealed and fixedly connected together through a stator connector 12, the stator connector 12 is sealed and connected to the end seals 114 at the corresponding ends of the stator assemblies 11, and the mover core shaft 211 passes through the second installation through hole 121; With the end seal 114 and the stator connector 12 connected together, the first pressure communication hole 1144 communicates with the second pressure communication hole 123 .

[0068] Specifically, two adjacent stator assemblies 11 are connected and fixed together via a stator connector 12 , and the specific description of how the stator connector 12 connects the two stator assemblies 11 together is not repeated here.

[0069] A second pressure connecting hole 123 is provided on the stator connecting piece 12. For two adjacent stator assemblies 11, the stator connecting piece 12 is connected to the corresponding end seals 114, and the first pressure connecting holes 1144 of the two end seals 114 are connected through the second pressure connecting hole 123 of the stator connecting piece 12.

[0070] Furthermore, the stator module 1 further includes a motor head 13 and an external terminal 14, the motor head 13 is provided with a third mounting through hole, an oil injection hole 132 and a wiring channel 131, the oil injection hole 132 and the wiring channel 131 are arranged outside the third mounting through hole, and the external terminal 14 is sealed and arranged in the wiring channel 131; The motor head 13 is connected to the stator assembly 11 at the top, and the third mounting through hole is configured to allow the mover core shaft 211 to pass through; The cables connected to the coil winding 113 also extend into the wiring channel 131 and are connected to the external connection terminal 14; The oil filling hole 132 is connected to the adjacent second pressure balance chamber 115 .

[0071] Specifically, the motor head 13 is fixedly mounted on the top stator assembly 11, and the stator assembly 11 can be sealed and fixedly connected to the motor head 13 through the stator connector 12. For the specific method of connecting the motor head 13 and the external terminal 14 to the cable of the coil winding 113, refer to the above description and will not be repeated here.

[0072] The motor head 13 is provided with an oil filling hole 132 , and during the assembly process, electrical insulating oil can be injected into the second pressure balance cavity 115 through the oil filling hole 132 , so that the second pressure balance cavity 115 and the first pressure balance cavity 153 are filled with electrical insulating oil.

[0073] In another embodiment of the present application, the linear motor further includes an upper cache oil pipe and / or a lower cache oil pipe 3 .

[0074] The upper cache oil pipe is arranged at the top of the stator module 1, and the lower cache oil pipe is arranged at the bottom of the stator module 1; the upper cache oil pipe is configured to communicate with the upper movable core shaft 211, and the lower cache oil pipe 3 is configured to communicate with the lower movable core shaft 211.

[0075] Specifically, with regard to the lower cache oil pipe 3, during use, on the one hand, after the multiple movable components 21 at the bottom are moved out from the bottom stator component 11, they can continue to be protected by the lower cache oil pipe; on the other hand, during the upward stroke movement of the movable component 21, the oil pumped by the oil pump enters the lower cache oil pipe to ensure that the oil can be pumped out smoothly and efficiently.

[0076] Similarly, for the upper cache oil pipe, during use, on the one hand, after the multiple mover assemblies 21 at the top are moved out from the top stator assembly 11, they can continue to be protected by the upper cache oil pipe; on the other hand, during the up and down movement of the mover assembly 21, the oil can be cached by the upper cache oil pipe.

[0077] In another embodiment of the present application, in order to improve the connection reliability between the mover assembly 21 and the bottom oil pump, the mover module 2 further includes a lower buffer connection assembly 23 .

[0078] The lower buffer connection assembly 23 includes two lower mounting seats 231 and a lower spring 232. The lower spring 232 is connected between the two lower mounting seats 231. The upper lower mounting seat 231 is connected to the mover core shaft 211 at the bottom, and the lower lower mounting seat 231 is configured to be connected to the oil pump.

[0079] Specifically, the movable core shaft 211 of the movable subassembly 21 located at the bottom needs to be connected to the oil pump. The movable core shaft 211 and the oil pump are connected and fixed via the lower buffer connection assembly 23. During use, the lower spring 232 can undergo elastic deformation according to the force conditions, thereby buffering the impact force of the movable subassembly 21 on the oil pump during the up and down stroke switching process, so as to improve the reliability of use.

[0080] In another embodiment of the present application, the present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, the linear motor is arranged vertically, the oil pump is arranged below the linear motor, and the rotor core shaft 211 of the rotor assembly 21 located at the bottom of the linear motor is connected to the oil pump.

[0081] Specifically, the oil production equipment includes an oil pump and the linear motor in the above embodiment. The linear motor is arranged vertically and located above the oil pump when in use. In this way, the linear motor applies tension to the plunger of the oil pump to drive the oil pump to pump oil.

[0082] Since the linear motor is arranged above the oil pump, in actual use, it is only necessary to ensure that the submersion depth of the oil pump meets the oil extraction requirements. The linear motor can be partially located below the liquid surface, or it can be arranged above the liquid surface.

[0083] During the oil pumping process, the oil pressure sensing component 152 is immersed in the well fluid pumped out by the oil pump. Through the transmission of electrical insulating oil, the internal pressure of the linear motor can be dynamically balanced with the pressure in the well fluid channel of the oil pump in real time. The pressure difference is small or there is no pressure difference. The sealing effect of each seal is safe and reliable. The linear motor is not affected by the well fluid pressure, and long-term stable operation can be achieved.

[0084] In another embodiment of the present application, the present application also provides an oil production equipment, including an oil pump and the above-mentioned linear motor, the linear motor is arranged horizontally, the oil pump is arranged at the rear end of the linear motor, and the rotor core shaft 211 of the rotor assembly 21 located at the rear end of the linear motor is connected to the oil pump.

[0085] Specifically, the oil production equipment includes an oil pump and the linear motor in the above embodiment. The linear motor is arranged horizontally in the oil well when in use, so that the oil pump can be arranged behind the linear motor. In this way, the plunger of the oil pump is driven by the linear motor to pump oil.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A linear motor, characterized in that: include: A stator module, the stator module comprises a plurality of stator components, the stator components comprise an outer sleeve, an inner liner and a coil winding, the coil winding and the inner liner are arranged in the outer sleeve, the coil winding is sleeved on the inner liner and is sealed between the outer sleeve and the inner liner, and two adjacent outer sleeves are sealed and connected together; A mover module, the mover module comprising a plurality of mover components and a mover connecting sleeve, the mover component comprising a mover core shaft and a permanent magnet, the permanent magnet being arranged outside the mover core shaft, and an oil channel being formed inside the mover core shaft; a through opening is arranged on the side wall of the mover connecting sleeve, two adjacent mover core shafts are connected together through the mover connecting sleeve, and two adjacent oil channels are connected through the mover connecting sleeve; Wherein, the movable module is slidably arranged in the stator module, and the movable module is inserted into the inner lining tube.

2. The linear motor according to claim 1, characterized in that The stator assembly further comprises two end seals, each of which is provided with a first mounting through hole; The end seal is sealably inserted into the corresponding pipe opening of the outer sleeve, and the end of the liner pipe is sealably inserted into the first installation through hole; The coil winding is located between the two end seals, and the mover core shaft passes through the first mounting through hole.

3. The linear motor according to claim 2, characterized in that The stator module further includes a stator connector, and the stator connector is provided with a second mounting through hole; Two adjacent stator assemblies are sealed and fixedly connected together via the stator connector, the stator connector is sealed and connected to the end seals at the corresponding ends of the stator assembly, and the mover core shaft passes through the second mounting through hole.

4. The linear motor according to claim 3, characterized in that The end seal is provided with a first wiring hole, and the stator connector is provided with a second wiring hole; For the end seal and the stator connector connected together, the first wiring hole is communicated with the second wiring hole; The cables connected to the coil winding pass through the first wiring hole and the second wiring hole.

5. The linear motor according to claim 1, characterized in that The stator module also includes: A pressure balancing assembly, the pressure balancing assembly comprising an outer protective tube and an oil pressure sensing component, the oil pressure sensing component being disposed in the outer protective tube; A first pressure balancing cavity is formed in the oil pressure sensing component, and the first pressure balancing cavity is configured to be filled with electrical insulating oil; the oil pressure sensing component is configured to be deformed by the hydraulic pressure in the outer protective tube to adjust the pressure in the first pressure balancing cavity; A second pressure balance cavity is formed between the outer sleeve and the inner liner, and the second pressure balance cavity is configured to be filled with electrical insulating oil; Wherein, the first pressure balance chamber and the second pressure balance chamber are communicated.

6. The linear motor according to claim 5, characterized in that The pressure balance assembly is arranged between two adjacent stator assemblies, and the mover core shaft of at least one mover assembly is inserted into the outer sleeve; Alternatively, the pressure balancing component is arranged on the stator component at the lower end of the stator module, and the mover core shaft of at least one mover component is inserted into the outer sleeve.

7. The linear motor according to claim 5, characterized in that: The first pressure balance chamber is communicated with the second pressure balance chamber respectively; Alternatively, two adjacent second pressure-balancing chambers are communicated with each other, and the first pressure-balancing chamber is communicated with the second pressure-balancing chamber in the movable subassembly at the bottom.

8. The linear motor according to any one of claims 5 to 7, characterized in that: The stator assembly further comprises two end seals, each of which is provided with a first mounting through hole; The end seal is sealably inserted into the corresponding pipe opening of the outer sleeve, and the end of the liner pipe is sealably inserted into the first installation through hole; The outer sleeve and the inner liner form the second pressure balance chamber between the two end seals, the coil winding is located between the two end seals, and the mover core shaft passes through the first installation through hole.

9. The linear motor according to claim 8, characterized in that: The end seal is also provided with a first pressure communication hole, and the first pressure communication hole is connected with the second pressure balance cavity; In the two stator assemblies connected together, the first pressure communication hole in one stator assembly is communicated with the adjacent first pressure communication hole in the other stator assembly.

10. The linear motor according to claim 9, characterized in that: The stator module further comprises a stator connector, the stator connector is provided with a second mounting through hole, and the stator connector is also provided with a second pressure communication hole; Two adjacent stator assemblies are sealed and fixedly connected together through the stator connector, the stator connector is sealed and connected to the end seals at the corresponding ends of the stator assembly, and the mover core shaft passes through the second mounting through hole; With the end seal and the stator connection member connected together, the first pressure communication hole is communicated with the second pressure communication hole.

11. The linear motor according to any one of claims 1 to 7, characterized in that: The linear motor further comprises an upper cache oil pipe and / or a lower cache oil pipe; the upper cache oil pipe is arranged at the top of the stator module, and the lower cache oil pipe is arranged at the bottom of the stator module; the upper cache oil pipe is configured to communicate with the mover core shaft located at the upper part, and the lower cache oil pipe is configured to communicate with the mover core shaft located at the lower part; And / or, the mover module also includes a lower buffer connection assembly, which includes two lower mounting seats and a lower spring, the lower spring is connected between the two lower mounting seats, the upper lower mounting seat is connected to the mover core shaft at the bottom, and the lower mounting seat at the bottom is configured to be connected to the oil pump.

12. An oil production equipment, comprising an oil pump, characterized in that: Also includes a linear motor according to any one of claims 1 to 11, characterized in that the linear motor is arranged vertically, the oil pump is arranged below the linear motor, and the mover core shaft of the mover assembly located at the bottom of the linear motor is connected to the oil pump; Alternatively, the linear motor is arranged transversely, the oil pump is arranged at the rear end of the linear motor, and the mover core shaft of the mover assembly located at the rear end of the linear motor is connected to the oil pump.

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