Linear motor and oil extraction equipment

Abstract

The utility model discloses a linear motor and oil extraction equipment. The linear motor comprises a stator module, a rotor module and a mounting sleeve, the stator module comprises a motor head, a motor connector and a plurality of stator assemblies, each stator assembly comprises an outer sleeve, a lining pipe and a coil winding, the coil windings and the lining pipes are arranged in the outer sleeves, the coil windings are arranged on the lining pipes in a sleeving mode and arranged between the outer sleeves and the lining pipes in a sealed mode, and the motor head is connected with the motor connector. Every two adjacent outer sleeves are connected together in a sealed mode. The plurality of stator assemblies are arranged between the motor head and the motor joint; the rotor module comprises a plurality of rotor assemblies, each rotor assembly comprises a rotor mandrel and a permanent magnet, the permanent magnets are arranged outside the rotor mandrels, oil liquid channels are formed in the rotor mandrels, every two adjacent rotor mandrels are connected together, and every two adjacent oil liquid channels are communicated with each other. The use reliability of the linear motor and the oil extraction equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical technical field, and particularly to a linear motor and oil extraction equipment. BACKGROUND

[0002] With the continuous improvement of oil exploitation technology and the increasing difficulty of exploitation, higher requirements are put forward for oil extraction devices in oil exploitation. At present, downhole oil extraction linear motor technology and oil pump technology are often developed to achieve the effect of downhole oil extraction and improve the service life of the oil extraction device.

[0003] The oil extraction method using a linear motor is to place an oil pump in an oil well, and a linear motor is used to drive the oil pump to operate to achieve oil extraction. For example, Chinese Patent Publication No. CN112283063A discloses a pump integrated oil extraction device and method, in which a linear motor is arranged above an oil pump. Under the action of the magnetic field of the motor stator, the motor rotor reciprocates to drive the pump plunger of the oil pump to reciprocate to achieve oil extraction. However, the pump plunger is integrated in the motor rotor and located in the stator of the motor. The pump plunger needs to cooperate with several ball valves built in the motor stator to achieve oil extraction. The overall structure is complex, and the oil extraction efficiency is low. Chinese Patent Publication No. CN 108880178 A discloses a multi-stage linear motor and an oil pump thereof. An independent linear motor and an oil pump are used. However, in the use process, the linear motor needs to apply a thrust force 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] Therefore, how to design a technology to improve the oil extraction efficiency is a technical problem to be solved by the present application. SUMMARY

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

[0006] The technical scheme provided by the present application is a linear motor, comprising:

[0007] A stator module, the stator module comprising a motor head, a motor joint, a plurality of stator assemblies, the stator assembly comprising an outer sleeve, an inner liner and a coil winding, the coil winding and the inner liner being arranged in the outer sleeve, the coil winding being sleeved on the inner liner and being sealingly arranged between the outer sleeve and the inner liner, and two adjacent outer sleeves being sealingly connected together; a plurality of stator assemblies are arranged between the motor head and the motor joint, an external connection terminal is arranged on the motor head, and the external connection terminal is connected with a cable of the coil winding;

[0008] The mover module comprises a plurality of mover assemblies, each of the mover assemblies comprises a mover shaft and a permanent magnet, the permanent magnet is arranged outside the mover shaft, the inside of the mover shaft forms an oil channel, and two adjacent mover shafts are connected together, and two adjacent oil channels are connected with each other;

[0009] The mounting sleeve is sleeved outside the stator assembly and is sealingly connected between the motor head and the motor joint, an auxiliary flow channel is formed between the stator assembly and the mounting sleeve, and the auxiliary flow channel is communicated with the oil channel;

[0010] The mounting sleeve is sleeved outside the stator assembly and is sealingly connected between the motor head and the motor joint, an auxiliary flow channel is formed between the stator assembly and the mounting sleeve, and the auxiliary flow channel is communicated with the oil channel;

[0011] The mover module is slidably arranged in the stator module, and the mover shaft is inserted into the inner liner tube.

[0012] In an embodiment of the present application, the oil channel is configured to flow upward in the oil channel when the mover shaft is in the downstroke movement;

[0013] The auxiliary flow channel is configured to flow downward in the auxiliary flow channel when the mover shaft is in the downstroke movement.

[0014] In an embodiment of the present application, the oil channel is configured to flow downward in the oil channel when the mover shaft is in the upstroke movement;

[0015] The auxiliary flow channel is configured to flow downward in the auxiliary flow channel when the mover shaft is in the upstroke movement.

[0016] In an embodiment of the present application, the mover module comprises a mover connecting sleeve, and a through hole is arranged in the side wall of the mover connecting sleeve;

[0017] Two adjacent mover shafts are connected together through the mover connecting sleeve, and two adjacent oil channels are communicated through the mover connecting sleeve;

[0018] The auxiliary flow channel is communicated with the oil channel through the through hole.

[0019] In an embodiment of the present application, the motor head is provided with a first connecting through hole extending along the axis direction of the mover shaft, the first connecting through hole is configured to pass through the mover shaft, the side wall of the motor head is further provided with a first communication hole, the first communication hole is communicated with the first connecting through hole, the first connecting through hole is communicated with the adjacent inner liner tube, the mounting sleeve is sleeved outside the first connecting through hole, and the auxiliary flow channel is communicated with the oil channel through the first connecting through hole and the through hole in sequence;

[0020] The motor head is provided with a second connecting through hole extending along the axis direction of the mover core shaft, and the second connecting through hole is configured to pass through the mover core shaft; the side wall of the motor head is further provided with a second communication hole in communication with the second connecting through hole, and the second connecting through hole is in communication with the adjacent inner liner tube; the installation sleeve is sleeved outside the second connecting through hole, and the auxiliary flow channel is in communication with the oil passage through the second connecting through hole and the through hole in sequence.

[0021] In an embodiment of the present application, the stator assembly further comprises two end seals, and the end seals are provided with first installation through holes;

[0022] The end seals are sealingly inserted into corresponding pipe mouths of the outer sleeve, and the end portions of the inner liner tubes are sealingly inserted into the first installation through holes;

[0023] The coil winding is located between the two end seals, and the mover core shaft passes through the first installation through holes.

[0024] In an embodiment of the present application, the stator module further comprises a stator connecting piece, and the stator connecting piece is provided with a second installation through hole;

[0025] Two adjacent stator assemblies are sealingly and fixedly connected together through the stator connecting piece, the stator connecting piece is sealingly connected with the end seals of the corresponding end portions of the stator assemblies, and the mover core shaft passes through the second installation through hole.

[0026] In an embodiment of the present application, the end seals are provided with first wire holes, and the stator connecting piece is provided with second wire holes;

[0027] For the end seals and the stator connecting piece connected together, the first wire holes are in communication with the second wire holes;

[0028] The cable connected to the coil winding passes through the first wire holes and the second wire holes;

[0029] The motor head is further provided with a wire channel, and the external connection terminal is sealingly arranged in the wire channel;

[0030] The cable connected to the coil winding further extends into the wire channel and is connected with the external connection terminal.

[0031] In an embodiment of the present application, the inner end surface of the end seal is further provided with a first key groove, the stator core of the coil winding is provided with a second key groove, the first key groove is in communication with the second key groove, and a positioning key is arranged in the second key groove, the end of the positioning key being inserted into the first key groove.

[0032] In an embodiment of the present application, the stator module further comprises:

[0033] The pressure balance assembly comprises an inner support tube and an oil pressure sensing component, and the oil pressure sensing component is arranged outside the inner support tube;

[0034] 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 electrically insulating oil; the oil pressure sensing component is configured to be deformed under external hydraulic action to adjust the pressure in the first pressure balance cavity;

[0035] A second pressure balance cavity is formed between the outer sleeve tube and the inner lining tube, and the second pressure balance cavity is configured to be filled with electrically insulating oil;

[0036] The first pressure balance cavity and the second pressure balance cavity are in communication.

[0037] In an embodiment of the present application, the pressure balance assembly is arranged between two adjacent stator assemblies, and the rotor shaft of at least one of the rotor assemblies is inserted into the outer sleeve tube;

[0038] Alternatively, the pressure balance assembly is arranged on the stator assembly at the lower end of the stator module, and the rotor shaft of at least one of the rotor assemblies is inserted into the outer sleeve tube.

[0039] In an embodiment of the present application, the first pressure balance cavity and the second pressure balance cavity are in communication with each other respectively;

[0040] Alternatively, two adjacent second pressure balance cavities are in communication with each other, and the first pressure balance cavity is in communication with the second pressure balance cavity in the bottom rotor assembly.

[0041] In an embodiment of the present application, the stator assembly further comprises two end seals, and the end seals are provided with first installation through holes;

[0042] The end seals are sealingly inserted into the corresponding pipe openings of the outer sleeve tube, and the end of the inner lining tube is sealingly inserted into the first installation through hole; the outer sleeve tube and the inner lining tube form the second pressure balance cavity between the two end seals, the coil winding is located between the two end seals, and the rotor shaft passes through the first installation through hole.

[0043] In an embodiment of the present application, a first pressure communication hole is further arranged on the end seal, and the first pressure communication hole is in communication with the second pressure balance cavity.

[0044] In the two connected stator assemblies, the first pressure communication hole in one stator assembly is in communication with the adjacent first pressure communication hole in the other stator assembly.

[0045] In an embodiment of the present application, the stator module further comprises a stator connecting piece, and the stator connecting piece is provided with a second mounting through hole, and a second pressure communication hole is further arranged on the stator connecting piece.

[0046] The two adjacent stator assemblies are sealingly and fixedly connected together through the stator connecting piece, the stator connecting piece is sealingly connected with the end seal at the corresponding end of the stator assembly, and the mover shaft passes through the second mounting through hole.

[0047] For the connected end seal and stator connecting piece, the first pressure communication hole is in communication with the second pressure communication hole.

[0048] In an embodiment of the present application, a wiring channel and an oil injection hole are further arranged on the motor head, the oil injection hole and the wiring channel are arranged outside the first connecting through hole, and the external terminal is sealingly arranged in the wiring channel.

[0049] The cable connected to the coil winding further extends into the wiring channel and is connected with the external terminal.

[0050] The oil injection hole is in communication with the adjacent second pressure balance cavity.

[0051] In an 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 be in communication with the mover shaft located at the upper portion, and the lower buffer oil pipe is configured to be in communication with the mover shaft located at the lower portion.

[0052] And / or, the mover module further comprises a lower buffer connecting assembly, the lower buffer connecting assembly comprises two lower mounting seats and a spring, the spring is connected between the two lower mounting seats, the upper lower mounting seat is connected with the mover shaft located at the bottom, and the lower lower mounting seat is configured to be connected with the oil pump.

[0053] The application also provides an oil extraction device, comprising an oil extraction pump and the linear motor.

[0054] The application also provides an oil extraction device, comprising an oil extraction pump and the linear motor.

[0055] Compared with the prior art, the application has the advantages and positive effects that:

[0056] By sealingly assembling the stator assembly into the mounting sleeve, an auxiliary flow channel is formed between the stator assembly and the mounting sleeve, and an oil liquid passage is formed in the mover core shaft of the mover module, the auxiliary flow channel and the oil liquid passage are in communication with each other, in use, the oil extraction pump is connected to the bottom of the mover module, and the mover core shaft provides a pulling force to the oil extraction pump to realize upward lifting of the oil liquid, thus, the requirement for the structural strength of the mover core shaft can be reduced, and the reciprocating movement stroke of the mover core shaft can be prolonged to meet the use requirement of the oil extraction pump of different strokes, the use range is expanded, the working state of the oil extraction pump is more reasonable and reliable, the oil extraction pump can be stably operated for a long time, the oil extraction amount and the oil extraction efficiency are improved, and the pump inspection period is prolonged.

[0057] In addition, the oil liquid passage formed in the mover core shaft and the auxiliary flow channel between the outer sleeve and the mounting sleeve can supply the oil liquid extracted by the oil extraction pump to flow upward, and the oil liquid can flow between the oil liquid passage and the auxiliary flow channel according to the pressure difference of the oil pressure, thus, the oil liquid can flow between the oil liquid passage and the auxiliary flow channel during the reciprocating operation of the mover assembly, on the one hand, the flowing oil liquid can play a role of heat absorption and cooling to improve the operation reliability of the linear motor, and on the other hand, the flowing oil liquid can reduce the resistance and pressure generated when the mover assembly moves upward, and can provide a certain damping force to the mover assembly when the mover assembly moves downward, to improve the stability and smoothness of operation.

[0058] 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 oil extraction in the oil well, the oil extraction pump is installed at the lower part or the rear part of the linear motor, the linear motor can work in a submersible state or a state of being separated from the well liquid, when the well liquid is lifted to the ground, the mover of the motor and the plunger of the oil extraction pump bear tensile stress, the force mode is reasonable, the system is stable, and the linear motor works in a state of being separated from the well liquid, that is, the linear motor is installed in the oil well above the pump submergence level, so that the cable can be completely separated from the long-term immersion of the well liquid, thereby prolonging the service life of the cable.

[0059] In addition, the oil field currently widely used tube type oil pump or rod type oil pump, can be completely matched with the application. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0061] Figure 1 It is one of the structural schematic diagram of the linear motor and oil extraction equipment embodiment of the present application;

[0062] Figure 2 It is the second structural schematic diagram of the linear motor and oil extraction equipment embodiment of the present application;

[0063] Figure 3 It is Figure 2 the sectional view in A-A direction;

[0064] Figure 4 It is Figure 3 the local enlarged schematic view of the B area;

[0065] Figure 5 It is Figure 3 the local enlarged schematic view of the C area;

[0066] Figure 6 It is Figure 3 the local enlarged schematic view of the D area;

[0067] Figure 7 It is Figure 1 the structural schematic diagram of the stator module;

[0068] Figure 8 It is Figure 7 the sectional view of the stator assembly;

[0069] Figure 9 It is Figure 7 the structural schematic diagram of the stator assembly;

[0070] Figure 10 It is Figure 7 the structural schematic diagram of the end seal;

[0071] Figure 11 It is Figure 7 the structural schematic diagram of the stator connecting piece;

[0072] Figure 12 It is Figure 7 the structural schematic diagram of the motor head;

[0073] Figure 13 For Figure 7 Structure diagram of motor joint;

[0074] Figure 14 For Figure 3 Structure diagram of mover module;

[0075] Figure 15 For Figure 3 Sectional view of mover module;

[0076] Figure 16 For Figure 15 Structure diagram of mover connecting sleeve;

[0077] Figure 17 For Figure 3 Structure diagram of pressure balance assembly;

[0078] Figure 18 For Figure 3 Sectional view of pressure balance assembly.

[0079] Reference signs:

[0080] 1, stator module; 11, stator assembly; 12, stator connecting piece; 13, motor head; 14, external terminal; 15, pressure balance assembly; 16, motor joint; 10, auxiliary flow channel;

[0081] 111, outer sleeve; 112, inner liner; 113, coil winding; 114, end seal; 115, second pressure balance cavity; 1141, first mounting through hole; 1142, first wiring hole; 1143, first key groove; 1144, first pressure communication hole; 1131, second key groove; 121, second mounting through hole; 122, second wiring hole; 123, second pressure communication hole;

[0082] 131, wiring channel; 132, oil injection hole; 133, first connecting through hole; 134, first communication hole;

[0083] 151, outer protective tube; 152, oil pressure sensing part; 153, first pressure balance cavity; 154, inner support tube;

[0084] 161, second connecting through hole; 162, second communication hole;

[0085] 2, mover module; 21, mover assembly; 22, mover connecting sleeve; 23, lower buffer connecting assembly;

[0086] 211, mover core shaft; 212, permanent magnet; 213, oil passage; 221, through hole; 231, lower mounting seat; 232, spring;

[0087] 3. lower cache tubing;

[0088] 4. mounting sleeve. DETAILED DESCRIPTION

[0089] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0090] As shown in the drawings, Figures 1-18 An embodiment of the present application provides a linear motor, which comprises:

[0091] a stator module 1, the stator module 1 comprising a motor head 13, a motor joint 16, a plurality of stator assemblies 11, the stator assembly 11 comprising an outer sleeve 111, an inner sleeve 112 and a coil winding 113, the coil winding 113 and the inner sleeve 112 being arranged in the outer sleeve 111, the coil winding 113 being sleeved on the inner sleeve 112 and being sealingly arranged between the outer sleeve 111 and the inner sleeve 112, and two adjacent outer sleeves 111 being sealingly connected together;

[0092] a mover module 2, the mover module 2 comprising a plurality of mover assemblies 21, the mover assembly 21 comprising a mover shaft 211 and a permanent magnet 212, the permanent magnet 212 being arranged outside the mover shaft 211, an oil passage 213 being formed inside the mover shaft 211, two adjacent mover shafts 211 being connected together, and two adjacent oil passages 213 being in communication with each other;

[0093] a mounting sleeve 4;

[0094] The mounting sleeve 4 is sleeved outside the stator assembly 11 and sealingly connected between the motor head 13 and the motor joint 16, an auxiliary flow channel 10 is formed between the stator assembly 11 and the mounting sleeve 4, and the auxiliary flow channel 10 is in communication with the oil passage 213.

[0095] The mover module 2 is slidably arranged in the stator module 1, and the mover shaft 211 is inserted in the inner sleeve 112.

[0096] Specifically, the linear motor provided by the application is provided with a mover module 2 in a stator module 1, the coil winding 113 in the stator module 1 is electrified to cooperate with the permanent magnet 212 in the mover module 2, so as to realize the reciprocating movement of the permanent magnet 212 driving the mover shaft 211 in the stator module 1. In addition, the plurality of stator assemblies 11 in the stator module 1 are arranged in the mounting sleeve 4, the two ends of the mounting sleeve 4 are respectively connected with the motor head 13 and the motor joint 16, and the plurality of stator assemblies 11 are supported and arranged in the mounting sleeve 4 through the motor head 13 and the motor joint 16, so that a space is formed between the stator assembly 11 and the inner wall of the mounting sleeve 4 to form an auxiliary flow channel 10, the auxiliary flow channel 10 can be communicated with the oil channel 213 in the mover assembly 21, and then the oil flow on both sides of the stator assembly 11 is realized.

[0097] For the stator module 1, the inner liner tube 112 and the coil winding 113 are arranged in the outer sleeve tube 111, the coil winding 113 is arranged in the sealed space between the outer sleeve tube 111 and the inner liner tube 112, so that the coil winding 113 is insulated and separated from the oil. The inner liner 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.

[0098] For the mover module 2, the mover shaft 211 is used as a supporting and mounting component, and the permanent magnet 212 is sleeved and fixed outside the mover shaft 211. The mover shaft 211 is a hollow structure to form an oil channel 213, so that during the operation of the oil pump driven by the mover shaft 211, the oil pumped by the oil pump can be transported upward through the mover shaft 211 to realize the transportation to the ground.

[0099] During the operation of the oil pump driven by the mover shaft 211, the mover shaft 211 provides a pulling force to the oil pump to pump the oil into the oil channel 213. The mover shaft 211 can provide a large pulling force, thereby meeting the use requirements of high-power oil pumps.

[0100] The upper part and the lower part of the auxiliary flow channel 10 are communicated with the oil channel 213 of the mover shaft 211 at the corresponding position through the motor head 13 and the motor joint 16. During use, the oil can flow between the auxiliary flow channel 10 and the oil channel 213, which can improve the smooth operation of the mover assembly 21 and effectively reduce the internal pressure.

[0101] During use, the oil in the auxiliary flow channel 10 can also exchange heat with the stator assembly 11 to take away the heat generated by the coil winding 113 at the corresponding position, thereby improving the use reliability of the linear motor.

[0102] Wherein, in the mover core shaft 211 is in the downstroke movement, the mover assembly 21 drives the oil well pump plunger to go down, the oil liquid in the oil well pump cylinder is extruded into the pump cylinder in the upper part of the plunger, and the next oil pumping preparation work is done, at this time, the oil liquid in the lower buffer oil pipe 3 flows upward in the oil liquid channel 213 relative to the mover core shaft 211; the oil liquid flows upward in the auxiliary flow channel 10 relative to the inner liner pipe 112, and the flow direction of the oil liquid conforms to the thermodynamic principle, the upward flowing oil liquid fully absorbs the heat generated during the operation of the linear motor, and the heat is brought to the front oil pipe of the motor head 13, and is continuously pushed to the wellhead direction in the next oil pumping process.

[0103] In addition, in the mover core shaft 211 is in the upstroke movement, the mover assembly 21 drives the oil well pump plunger to go up, the oil liquid in the upper part of the oil well pump plunger and the pump cylinder is lifted into the lower buffer oil pipe 3, and the front part of the upward moving mover assembly 21 pushes the oil liquid in the oil pipe space in front of the motor head 13 to flow to the wellhead direction when entering the oil pipe space, because the diameter of the mover assembly 21 is slightly larger than the diameter of the oil well pump plunger, at this time, a small amount of oil liquid flows downward in the oil liquid channel 213 relative to the mover core shaft 211; a small amount of oil liquid flows downward in the auxiliary flow channel 10 relative to the inner liner pipe 112 and flows into the lower buffer oil pipe 3. The volume of the part of the oil liquid flowing downward offsets the volume difference between the mover assembly 21 and the oil well pump plunger in the same stroke, so that in the upstroke movement, the force on the mover assembly 21 is only the resistance of the oil well pump plunger going up.

[0104] As described above, the mover assembly 21 of the linear motor drives the lower oil well pump plunger to move up and down in a regular and reciprocating motion, and continuously pumps the oil liquid in the oil well from the deep oil layer to the wellhead on the ground, so that the complete and efficient oil extraction process is realized. Because the pumped oil liquid fully absorbs the heat of the linear motor, the oil liquid temperature is higher compared with the conventional oil extraction method, and wax precipitation and freezing blockage do not occur in the oil pipe.

[0105] In an embodiment of the present application, in order to facilitate the communication between the auxiliary flow channel 10 and the oil liquid channel 213, the mover module 2 comprises a mover connecting sleeve 22, and the side wall of the mover connecting sleeve 22 is provided with a through hole 221;

[0106] The adjacent two mover core shafts 211 are connected together through the mover connecting sleeve 22, and the adjacent two oil liquid channels 213 are communicated through the mover connecting sleeve 22;

[0107] The auxiliary flow channel 10 is communicated with the oil liquid channel 213 through the through hole 221.

[0108] Specifically, for the two adjacent mover assemblies 21, the two adjacent mover shafts 211 are connected through the mover connecting sleeve 22, and the oil flows between the two oil channels 213 through the mover connecting sleeve 22. At the same time, the oil flowing in the oil channel 213 in the mover shaft 211 can also enter and exit through the through hole 221. In use, the oil can flow between the auxiliary flow channel 10 and the oil channel 213 through the through hole 221.

[0109] Further, in order to facilitate the communication between the auxiliary flow channel 10 and the oil channel 213 in the mover shaft 211 in the mover module 2, the motor head 13 is provided with a first connecting through hole 133 extending along the axis direction of the mover shaft 211, and the first connecting through hole 133 is configured to pass through the mover shaft 211; the side wall of the motor head 13 is further provided with a first communication hole 134, the first communication hole 134 communicates with the first connecting through hole 133, and the first connecting through hole 133 communicates with the adjacent inner liner tube 112; the mounting sleeve 4 is sleeved outside the first connecting through hole 133, and the auxiliary flow channel 10 communicates with the oil channel 213 through the first connecting through hole 133 and the through hole 221 in turn;

[0110] The motor joint 16 is provided with a second connecting through hole 161 extending along the axis direction of the mover shaft 211, and the second connecting through hole 161 is configured to pass through the mover shaft 211; the side wall of the motor head 13 is further provided with a second communication hole 162, the second communication hole 162 communicates with the second connecting through hole 161, and the second connecting through hole 161 communicates with the adjacent inner liner tube 112; the mounting sleeve 4 is sleeved outside the second connecting through hole 161, and the auxiliary flow channel 10 communicates with the oil channel 213 through the second connecting through hole 161 and the through hole 221 in turn.

[0111] Specifically, the mounting sleeve 4 is connected between the motor head 13 and the motor joint 16, so that the mover assembly 21 between the motor head 13 and the motor joint 16 can be suspended in the mounting sleeve 4 and at the same time form the auxiliary flow channel 10.

[0112] The first connecting through hole 133 provided on the motor head 13 can supply the mover shaft 211 to reciprocate therein, and the first communication hole 134 provided on the motor head 13 can communicate with the through hole 221 on the mover connecting sleeve 22 at the adjacent position. In this way, the upper end of the auxiliary flow channel 10 can communicate with the oil channel 213 through the first communication hole 134 provided on the motor head 13, and the corresponding through hole 221.

[0113] Similarly, the second connection through hole 161 provided on the motor joint 16 can supply the reciprocating movement of the mover core shaft 211 therein, and the second communication hole 162 provided on the motor joint 16 can be in communication with the through hole 221 on the mover connecting sleeve 22 at the adjacent position. In this way, the lower end of the auxiliary flow channel 10 can be in communication with the oil passage 213 via the second communication hole 162 provided on the motor joint 16, the corresponding through hole 221.

[0114] In an embodiment of the present application, the stator assembly 11 further comprises two end seals 114, and the end seals 114 are provided with first installation through holes 1141;

[0115] The end seals 114 are sealingly inserted into the corresponding pipe openings of the outer sleeve 111, and the ends of the inner liner 112 are sealingly inserted into the first installation through holes 1141;

[0116] The coil winding 113 is located between the two end seals 114, and the mover core shaft 211 passes through the first installation through holes 1141.

[0117] Specifically, in order to facilitate the sealing 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 sealingly connect the outer sleeve 111 and the inner liner 112 at the corresponding end positions, so that the coil winding 113 can be sealingly assembled between the outer sleeve 111 and the inner liner 112.

[0118] The sealing mode between the end seals 114 and the outer sleeve 111 and the inner liner 112 can be welding or adding a sealing ring, which is not limited here.

[0119] Further, the stator module 1 further comprises a stator connecting piece 12, and the stator connecting piece 12 is provided with a second installation through hole 121;

[0120] The two adjacent stator assemblies 11 are sealingly and fixedly connected together through the stator connecting piece 12, the stator connecting piece 12 is sealingly connected with 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.

[0121] Specifically, for the two adjacent stator assemblies 11, in order to facilitate the connection, the two adjacent stator assemblies 11 are connected and fixed through the stator connecting piece 12, and the stator connecting piece 12 can be connected together with the end seals 114 at the corresponding ends of the stator assemblies 11 by bolts or the like.

[0122] Further, in order to facilitate the power supply of the coil winding 113 through the cable, the end seal 114 is provided with a first wire hole 1142, and the stator connecting piece 12 is provided with a second wire hole 122;

[0123] For the end seal 114 and the stator connecting piece 12 connected together, the first wire hole 1142 is in communication with the second wire hole 122;

[0124] The cable connected to the coil winding 113 passes through the first wire hole 1142 and the second wire hole 122;

[0125] The stator module 1 further comprises a motor head 13 and an external wire terminal 14, the motor head 13 is further provided with a first connecting through hole 133, the motor head 13 is further provided with a wire channel 131, and the external wire terminal 14 is sealingly arranged in the wire channel 131; the motor head 13 is connected to the top stator assembly 11, and the first connecting through hole 133 is configured to pass through the mover shaft 211;

[0126] The cable connected to the coil winding 113 further extends into the wire channel 131 and is connected to the external wire terminal 14.

[0127] Specifically, in order to supply power to the coil winding 113 in the stator module 1, an external power supply is connected to the coil winding 113 in different stator assemblies 11 through a cable to achieve power supply. Since the overall length of the stator module 1 is relatively long, in order to facilitate the arrangement of the cable, the motor head 13 is arranged on the topmost stator assembly 11, the external wire terminal 14 is arranged on the motor head 13, and the external wire terminal 14 is connected to the external power supply. As for the inside of the stator module 1, the cable extends into the wire channel 131 and is connected to the external wire terminal 14.

[0128] In this way, for two adjacent stator assemblies 11, the cable can be routed through the first wire hole 1142 and the second wire hole 122, and the top motor head 13 can be powered through the external wire terminal 14 and electrically connected to the cable in the wire channel 131.

[0129] In an embodiment, in order to facilitate the positioning of the coil winding 113 in the stator assembly 11, facilitating the wiring inside the stator assembly 11, the inner end face of the end seal 114 is further provided with a first key groove 1143, the stator core of the coil winding 113 is provided with a second key groove 1131, the first key groove 1143 is in communication with the second key groove 1131, and the second key groove 1131 is provided with a positioning key (not shown), and the end of the positioning key is inserted into the first key groove 1143.

[0130] Specifically, inside the stator assembly 11, since the cable is led through the first wire hole 1142 of the end seal 114, and the cable needs to be accurately connected with the coil windings 113 arranged in sequence. Therefore, the coil windings 113 arranged in sequence need to be accurately positioned, and the second key groove 1131 is arranged on the stator core of the coil winding 113, and the plurality of coil windings 113 are accurately positioned by the positioning key, and the end of the positioning key is also inserted into the first key groove 1143 of the end seal 114, so that the relative position of the end seal 114 and the coil winding 113 is kept high precision, thereby facilitating the accurate wiring of the cable during assembly.

[0131] In another embodiment of the present application, the stator module 1 further comprises:

[0132] The pressure balance assembly 15 comprises an inner support tube 154 and an oil pressure sensing component 152, and the oil pressure sensing component 152 is arranged on the inner support tube 154;

[0133] The oil pressure sensing component 152 is formed with a first pressure balance cavity 153, and the first pressure balance cavity 153 is configured to be filled with electrically insulating oil; the oil pressure sensing component 152 is configured to be deformed under the action of external oil pressure to adjust the pressure in the first pressure balance cavity 153;

[0134] The outer sleeve tube 111 and the inner liner tube 112 form a second pressure balance cavity 115, and the second pressure balance cavity 115 is configured to be filled with electrically insulating oil;

[0135] The first pressure balance cavity 153 and the second pressure balance cavity 115 are in communication.

[0136] Specifically, since the oil pressure in the mounting sleeve 4 and the oil passage 213 is large, and there is also a gap between the mover assembly 21 and the inner liner tube 112 to meet the requirement of reciprocating motion, the oil pressure flowing out of the through hole 221 of the mover connecting sleeve 22 will also flow into the space between the mover assembly 21 and the inner liner tube 112.

[0137] In this way, the oil liquid generates hydraulic pressure inside and outside the stator assembly 11. In order to improve the pressure resistance of the stator assembly 11, without increasing the wall thickness of the outer sleeve tube 111 and the inner liner tube 112, the pressure balance assembly 15 is arranged to balance the pressure difference inside and outside the stator assembly 11. In order to effectively reduce the wall thickness of the outer sleeve tube 111 and the inner liner tube 112, thereby reducing the overall outer diameter of the linear motor.

[0138] Specifically, after the pressure balancing assembly 15 is added, the first pressure balancing cavity 153 formed by the pressure balancing assembly 15 is in communication with the adjacent second pressure balancing cavities 115, and the adjacent two second pressure balancing cavities 115 are also in communication with each other. Under the action of the internal electrically insulating oil, the pressure of the first pressure balancing cavity 153 can be substantially the same as the pressure of the different second pressure balancing cavities 115.

[0139] In use, the oil pressure sensing component 152 is deformed under the pressure of the oil in the mounting sleeve 4, and the electrically insulating oil in the first pressure balancing cavity 153 is deformed to be substantially the same as the pressure of the external oil. In this way, the electrically insulating oil in the different second pressure balancing cavities 115 can be substantially the same as the pressure of the external oil, so that the structural strength of the thin outer sleeve 111 and the inner liner 112 can meet the use requirements of the pressure difference on both sides, improve the safety and reliability of the linear motor, and meet the design requirements of the small size of the outer circumference of the linear motor.

[0140] Among them, for the oil pressure sensing component 152, it can be a pressure capsule containing electrically insulating oil, and the pressure capsule is installed on the inner support pipe 154. Alternatively, the oil pressure sensing component 152 includes an elastic sleeve, which is sleeved on the inner support pipe 154, and the two ends of the elastic sleeve are sealingly connected to the inner support pipe 154 to form the first pressure balancing cavity 153. The elastic sleeve is deformed under the pressure of the oil outside to achieve that the pressure difference between the second pressure balancing cavity 115 and the oil outside is within a small range. The specific structure of the oil pressure sensing component 152 is not limited and described here.

[0141] In addition, in order to protect the oil pressure sensing component 152, the pressure balancing assembly 15 includes an outer protective pipe 151, which wraps the outside of the oil pressure sensing component 152 to protect the oil pressure sensing component 152. In order to accurately detect the pressure of the oil, the pipe wall of the outer protective pipe 151 is provided with a through hole, so that the oil can flow into the inside of the outer protective pipe 151 to generate pressure on the oil pressure sensing component 152.

[0142] In an embodiment, the pressure balancing assembly 15 is arranged between the two adjacent stator assemblies 11, and the mover core shaft 211 of at least one of the mover assemblies 21 is inserted into the outer sleeve 111. In this case, the two adjacent second pressure balancing cavities 115 are in communication with each other, and the first pressure balancing cavities 153 are in communication with the second pressure balancing cavities 115, respectively.

[0143] Alternatively, the pressure balance assembly 15 is arranged on the stator assembly 11 at the lower end of the stator module 1, and the mover shaft 211 of at least one of the mover assemblies 21 is inserted into the outer sleeve 111. In this case, the inner support tube 154 is connected between the motor joint 16 and the bottom stator assembly 11, and the second pressure balance cavities 115 of adjacent two stator assemblies 11 are in communication with each other, and the first pressure balance cavity 153 is in communication with the second pressure balance cavity 115 of the bottom mover assembly 21.

[0144] Specifically, in order to facilitate the wiring installation of the cable, the pressure balance assembly 15 is arranged on the bottom stator assembly 11 as an example.

[0145] In use, after the linear motor is placed in the oil well, the pressure balance assembly 15 is arranged above the adjacent bottom pump. The oil pumped by the pump flows into the pressure balance assembly 15 through the motor joint 16 and then flows through each stator assembly 11 in turn. The oil pressure sensing part 152 adjusts the internal electrical insulation oil pressure according to the external oil pressure to ensure the reliable operation of the linear motor.

[0146] Further, the stator assembly 11 further comprises two end seals 114, and the end seal 114 is provided with a first installation through hole 1141.

[0147] The end seal 114 is sealingly inserted into the corresponding pipe opening of the outer sleeve 111, and the end of the inner liner 112 is sealingly inserted into the first installation through hole 1141. The outer sleeve 111 and the inner liner 112 form the second pressure balance cavity 115 between the two end seals 114, and the coil winding 113 is located between the two end seals 114, and the mover shaft 211 passes through the first installation through hole 1141.

[0148] Specifically, the outer sleeve 111 and the inner liner 112 in the stator assembly 11 are sealingly connected by the end seal 114 to form the second pressure balance cavity 115. In order to realize the mutual communication between the second pressure balance cavities 115, the first pressure communication hole 1144 is arranged on the end seal part, and the first pressure communication hole 1144 is in communication with the second pressure balance cavity 115.

[0149] Specifically, the electrical insulation oil in the second pressure balance cavity 115 can enter and exit through the first pressure communication hole 1144, so that the electrical insulation oil can be used to balance the pressure in the second pressure balance cavities 115 at different positions.

[0150] In the two stator assemblies 11 connected together, the first pressure communication hole 1144 in one stator assembly 11 communicates 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 communicates with the first pressure balance cavity 153 of the pressure balance assembly 15 through the first pressure communication hole 1144.

[0151] In addition, for the first key groove 1143 arranged on the end seal 114, the first key groove 1143 extends on the end face of the end seal 114, one end of the first key groove 1143 extends to and communicates with the first mounting through hole 1141, and the other end of the first key groove 1143 extends to the outer side wall of the end seal 114, and the first pressure communication hole 1144 is located in the first key groove 1143.

[0152] In this way, after assembly, the electrical insulation oil in the first pressure balance cavity 153 can enter and exit the first pressure communication hole 1144 through the transversely arranged first key groove 1143, so as to ensure smooth flow of the internal electrical insulation oil between different pressure balance cavities.

[0153] Further, the stator module 1 further comprises a stator connecting piece 12, the stator connecting piece 12 is provided with a second mounting through hole 121, and the stator connecting piece 12 is further provided with a second pressure communication hole 123;

[0154] The two adjacent stator assemblies 11 are sealingly and fixedly connected together through the stator connecting piece 12, the stator connecting piece 12 is sealingly connected with the end seal 114 at the corresponding end of the stator assembly 11, and the mover core shaft 211 passes through the second mounting through hole 121;

[0155] For the connected end seal 114 and stator connecting piece 12, the first pressure communication hole 1144 communicates with the second pressure communication hole 123.

[0156] Specifically, the two adjacent stator assemblies 11 are connected and fixed together through the stator connecting piece 12, and specific description of the stator connecting piece 12 connecting the two stator assemblies 11 together is not repeated here.

[0157] The stator connecting piece 12 is provided with a second pressure communication hole 123, for the two adjacent stator assemblies 11, the stator connecting piece 12 is connected with the corresponding end seal 114, and the first pressure communication hole 1144 of the two end seals 114 is connected through the second pressure communication hole 123 of the stator connecting piece 12.

[0158] Further, the stator module 1 further comprises an external wiring terminal 14, the motor head 13 is provided with an oil injection hole 132 and a wiring channel 131, the oil injection hole 132 and the wiring channel 131 are arranged outside the first connecting through hole 133, and the external wiring terminal 14 is sealingly arranged in the wiring channel 131;

[0159] The motor head 13 is connected to the top stator assembly 11, and the first connecting through hole 133 is configured to pass through the mover shaft 211;

[0160] The cable connected to the coil winding 113 further extends into the wiring channel 131 and is connected to the external wiring terminal 14;

[0161] The oil injection hole 132 is in communication with the adjacent second pressure balance cavity 115.

[0162] Specifically, the motor head 13 is fixedly installed on the top stator assembly 11, and the stator assembly 11 can be sealingly and fixedly connected to the motor head 13 through the stator connecting piece 12. For specific modes of the motor head 13 and the external wiring terminal 14 to realize the cable connection of the coil winding 113, reference can be made to the above description, and details are not repeated here.

[0163] The motor head 13 is provided with an oil injection hole 132, and during assembly, electrical insulating oil can be injected into the second pressure balance cavity 115 through the oil injection hole 132, so that the second pressure balance cavity 115 and the first pressure balance cavity 153 are filled with electrical insulating oil.

[0164] In another embodiment of the present application, the linear motor further comprises an upper oil buffer pipe and / or a lower oil buffer pipe 3.

[0165] The upper oil buffer pipe is arranged at the top of the stator module 1, and the lower oil buffer pipe is arranged at the bottom of the stator module 1; the upper oil buffer pipe is configured to be in communication with the mover shaft 211 located at the upper portion, and the lower oil buffer pipe 3 is configured to be in communication with the mover shaft 211 located at the lower portion.

[0166] Specifically, for the lower oil buffer pipe 3, during use, on the one hand, it can continue to be protected through the lower oil buffer pipe after the plurality of mover assemblies 21 at the bottom are moved out of the bottom stator assembly 11, and on the other hand, during the upward movement of the mover assembly 21, the oil pumped by the oil pump enters the lower oil buffer pipe, so as to ensure that the oil can be smoothly and efficiently pumped out.

[0167] Similarly, for the upper buffer oil pipe, in use, on the one hand, after the plurality of mover assemblies 21 at the top are moved out of the stator assembly 11 at the top, the upper buffer oil pipe continues to protect, and on the other hand, during the up-and-down movement of the mover assemblies 21, the upper buffer oil pipe buffers the oil.

[0168] In another embodiment of the present application, in order to improve the connection reliability of the mover assembly 21 and the bottom oil well pump, the mover module 2 further comprises a lower buffer connection assembly 23.

[0169] The lower buffer connection assembly 23 comprises two lower mounting seats 231 and a spring 232, the spring 232 is connected between the two lower mounting seats 231, the upper lower mounting seat 231 is connected with the mover shaft 211 at the bottom, and the lower lower mounting seat 231 is configured to be connected with the oil well pump.

[0170] Specifically, the mover shaft 211 of the mover assembly 21 at the bottom needs to be connected with the oil well pump, and the mover shaft 211 and the oil well pump are connected and fixed through the lower buffer connection assembly 23. During use, the spring 232 can be elastically deformed according to the force condition, thereby buffering the impact force generated by the mover assembly 21 on the oil well pump during up-and-down stroke switching, so as to improve the use reliability.

[0171] In another embodiment of the present application, the present application further provides an oil extraction equipment, comprising an oil well pump and the above-mentioned linear motor, the linear motor is vertically arranged, the oil well pump is arranged below the linear motor, and the mover shaft 211 of the mover assembly 21 at the bottom in the linear motor is connected with the oil well pump.

[0172] Specifically, the oil extraction equipment comprises an oil well pump and the linear motor in the above-mentioned embodiment, and the linear motor is vertically arranged and located above the oil well pump in the use state, so that the linear motor exerts a pulling force on the plunger of the oil well pump to drive the oil well pump to pump oil.

[0173] Since the linear motor is arranged above the oil well pump, during actual use, only the submergence depth of the oil well pump needs to be ensured to meet the oil extraction requirements, the linear motor can be partially located below the liquid surface, or the linear motor can be arranged above the liquid surface.

[0174] During oil extraction, the oil pressure sensing part 152 is immersed in the well fluid pumped out by the oil well pump, and through the transmission of the electrically insulating oil, the internal pressure of the linear motor can be dynamically balanced with the pressure in the well fluid channel of the oil pumping machine in real time, the pressure difference is small or no pressure difference, the sealing effect of each sealing part is safe and reliable, the linear motor is not affected by the well fluid pressure, and long-term stable operation is achieved.

[0175] In yet another embodiment of the present application, the present application further provides an oil pumping device, comprising an oil pumping pump, and the above linear motor, the linear motor is arranged horizontally, the oil pumping pump is arranged at the rear end of the linear motor, and the mover core shaft 211 of the mover assembly 21 at the rear end of the linear motor is connected with the oil pumping pump.

[0176] Specifically, the oil pumping device comprises the oil pumping pump and the linear motor in the above embodiment, the linear motor is arranged horizontally in the oil well in the use state, so that the oil pumping pump can be arranged behind the linear motor, so that the plunger of the oil pumping pump is driven to run by the linear motor to pump the oil.

[0177] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A linear motor, characterized by, The motor comprises: a stator module, the stator module comprising a motor head, a motor joint, a plurality of stator assemblies, the stator assembly comprising an outer sleeve, an inner liner and a coil winding, the coil winding and the inner liner being arranged in the outer sleeve, the coil winding being sleeved on the inner liner and being sealingly arranged between the outer sleeve and the inner liner, two adjacent outer sleeves being sealingly connected together; a plurality of stator assemblies are arranged between the motor head and the motor joint, the motor head being provided with an external wire terminal, the external wire terminal being connected with a cable of the coil winding; a rotor module, the rotor module comprising a plurality of rotor assemblies, the rotor assembly comprising a rotor shaft and a permanent magnet, the permanent magnet being arranged outside the rotor shaft, an oil passage being formed inside the rotor shaft, two adjacent rotor shafts being connected together, two adjacent oil passages being communicated with each other; a mounting sleeve; wherein the mounting sleeve is sleeved outside the stator assembly and sealingly connected between the motor head and the motor joint, an auxiliary flow channel being formed between the stator assembly and the mounting sleeve, the auxiliary flow channel being communicated with the oil passage; the rotor module is slidably arranged in the stator module, the rotor shaft being inserted in the inner liner.

2. The linear motor of claim 1, wherein The rotor module comprises a rotor connecting sleeve, a through hole being arranged in the side wall of the rotor connecting sleeve; two adjacent rotor shafts are connected together through the rotor connecting sleeve, two adjacent oil passages are communicated through the rotor connecting sleeve; the auxiliary flow channel is communicated with the oil passage through the through hole.

3. The linear motor of claim 2, wherein The motor head is provided with a first connecting through hole, the first connecting through hole extending along the axial direction of the rotor shaft, the first connecting through hole being configured to pass through the rotor shaft; the side wall of the motor head is further provided with a first communicating hole, the first communicating hole being communicated with the first connecting through hole, the first connecting through hole being communicated with the adjacent inner liner; the mounting sleeve is sleeved outside the first connecting through hole, the auxiliary flow channel being communicated with the oil passage in sequence through the first connecting through hole and the through hole; The motor joint is provided with a second connecting through hole, the second connecting through hole extending along the axial direction of the rotor shaft, the second connecting through hole being configured to pass through the rotor shaft; the side wall of the motor head is further provided with a second communicating hole, the second communicating hole being communicated with the second connecting through hole, the second connecting through hole being communicated with the adjacent inner liner; the mounting sleeve is sleeved outside the second connecting through hole, the auxiliary flow channel being communicated with the oil passage in sequence through the second connecting through hole and the through hole.

4. The linear motor of claim 1, wherein The stator assembly further comprises two end seals, the end seal being provided with a first mounting through hole; the end seal is sealingly inserted into the corresponding pipe opening of the outer sleeve, the end of the inner liner is sealingly inserted into the first mounting through hole; the coil winding is located between the two end seals, the rotor shaft passes through the first mounting through hole.

5. The linear motor of claim 4, wherein The stator module further comprises a stator connecting piece provided with a second installation through hole; Two adjacent stator assemblies are sealingly and fixedly connected together through the stator connecting piece, the stator connecting piece is sealingly connected with the end seal of the corresponding end portion in the stator assembly, and the mover core shaft passes through the second installation through hole.

6. The linear motor of claim 5, wherein, The end seal is provided with a first wire hole, and the stator connecting piece is provided with a second wire hole; The first wire hole and the second wire hole are in communication for the end seal and the stator connecting piece connected together; The cable connected on the coil winding passes through the first wire hole and the second wire hole; The motor head is further provided with a wire channel, and the external wire terminal is sealingly arranged in the wire channel; The cable connected on the coil winding further extends into the wire channel and is connected with the external wire terminal.

7. The linear motor of claim 1, wherein The stator module further comprises: A pressure balance assembly, the pressure balance assembly comprises an inner support pipe and an oil pressure sensing part, the oil pressure sensing part is arranged on the inner support pipe; A first pressure balance cavity is formed in the oil pressure sensing part, the first pressure balance cavity is configured to be filled with electrically insulating oil; the oil pressure sensing part is configured to be deformed under the action of external oil pressure to adjust the pressure in the first pressure balance cavity; A second pressure balance cavity is formed between the outer sleeve and the inner lining tube, and the second pressure balance cavity is configured to be filled with electrically insulating oil; The first pressure balance cavity and the second pressure balance cavity are in communication.

8. The linear motor of claim 7, wherein, The stator assembly further comprises two end seals provided with first installation through holes; The end seals are sealingly inserted into the corresponding pipe openings of the outer sleeve, and the end seals of the inner lining tube are sealingly inserted into the first installation through holes; The outer sleeve and the inner lining tube form the second pressure balance cavity between the two end seals, and 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 of claim 8, wherein, The end seal is further provided with a first pressure communication hole, and the first pressure communication hole is in communication with the second pressure balance cavity; In the two stator assemblies connected together, the first pressure communication hole in one stator assembly is in communication with the adjacent first pressure communication hole in the other stator assembly.

10. The linear motor of claim 9, wherein, The stator module further comprises a stator connecting piece provided with a second installation through hole, and the stator connecting piece is further provided with a second pressure communication hole; Two adjacent stator assemblies are sealingly and fixedly connected together through the stator connecting piece, the stator connecting piece is sealingly connected with the end seal of the corresponding end portion in the stator assembly, and the mover core shaft passes through the second installation through hole; For the end seal and the stator connecting piece connected together, the first pressure communication hole and the second pressure communication hole are in communication.

11. The linear motor of claim 10, wherein, The motor head is provided with an oil injection hole and a wire channel, the oil injection hole and the wire channel are arranged outside the first connecting through hole, and the external wire terminal is sealingly arranged in the wire channel; The motor head is connected to the stator assembly on the top; The cable connected to the coil winding also extends into the wire channel and is connected to the external wire terminal; The oil injection hole is in communication with the adjacent second pressure balance cavity.

12. Linear motor according to any of claims 1-7, characterized in that The linear motor further comprises an upper buffer oil pipe and / or a lower buffer oil pipe; the upper buffer oil pipe is arranged on the top of the stator module, and the lower buffer oil pipe is arranged on the bottom of the stator module; the upper buffer oil pipe is configured to be in communication with the mover shaft located on the upper portion, and the lower buffer oil pipe is configured to be in communication with the mover shaft located on the lower portion; And / or, the mover module further comprises a lower buffer connecting assembly, the lower buffer connecting assembly comprises two lower mounting seats and a spring, the spring is connected between the two lower mounting seats, the upper lower mounting seat is connected with the mover shaft located on the bottom, and the lower lower mounting seat is configured to be connected with the oil pump.

13. An oil production apparatus comprising a pump, characterised in that, Further comprising the linear motor according to any one of claims 1-12, the linear motor is arranged vertically, the oil pump is arranged below the linear motor, and the mover shaft of the mover assembly located on the bottom in the linear motor is connected with the oil pump; Or, the linear motor is arranged horizontally, the oil pump is arranged at the rear end of the linear motor, and the mover shaft of the mover assembly located at the rear end in the linear motor is connected with the oil pump.

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