Direct drive motor of oil pumping unit

Abstract

The invention relates to the technical field of direct-drive motors, in particular to a direct-drive motor of a pumping unit. The device comprises an electric drive assembly and a transmission assembly arranged at the bottom of the electric drive assembly. According to the invention, when the load is small, the two power transmission bodies are in rigid connection, and the electromagnetic coil structure can directly drive the input shaft of the screw pump of the oil pumping unit through the adapter shaft, the composite structure and the output shaft, so that the output loss of a direct drive motor is reduced, and the adjustment of the screw pump can be quickly responded; when the load is increased, the acting force on the power transmission bodies can drive the control body to move, and the two power transmission bodies are controlled to be switched from rigid connection to flexible connection, so that buffering can be carried out, and damage to the direct drive motor and the input shaft of the screw pump of the oil pumping unit is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of direct-drive motors, and in particular to a direct-drive motor for an oil pump. Background Art

[0002] A direct-drive motor is a motor that directly drives the machine to operate without any intermediate mechanical transmission link. Through direct drive, the efficiency and precision of the system are significantly improved, and mechanical transmission parts are reduced, thereby increasing the life of the equipment. Direct-drive motors can provide higher precision and efficiency and have a wide range of applications.

[0003] By directly connecting the reducer of the oil pumping unit through a direct-drive motor, the working efficiency of the oil pumping unit can be improved and the smooth operation of the oil pumping unit can be ensured. For example, CN113270952B involves a flexible drive semi-direct drive motor for an oil pumping unit, which is mainly composed of a housing, a stator, a magnetic steel, a rotor bracket, an elastic plate, a shaft sleeve and other parts. The inner circumference of the rotor bracket is evenly distributed with a plurality of radial connecting plates and tangential supporting plates, and the outer circumference of the shaft sleeve is evenly distributed with a plurality of radial connecting plates and tangential supporting plates. The elastic plate is respectively connected to the connecting plates on the rotor bracket and the shaft sleeve, and the magnetic steel is evenly distributed on the outer surface of the rotor bracket. The stator is relatively sleeved on the inner wall of the casing. The motor of the patent directly drives the reducer of the oil pumping unit, eliminating the original belt drive, and because the elastic plate has a certain deformation capacity, the gears of the reducer can be protected from impact loads when the oil pumping unit is running; The problem is that when the motor of this patent is used to drive the screw pump of the oil pump, when the load on the reducer is large, the elastic changes of the radial connecting plate and the elastic plate can protect the reducer from damage, but when the load on the reducer is small, the radial connecting plate and the elastic plate will still undergo elastic changes, which leads to a loss in the output efficiency of the direct-drive motor and a response delay problem when adjusting the operating speed of the screw pump of the oil pump.

[0004] In order to reduce the output loss of the direct-drive motor and to quickly respond to the adjustment of the screw pump, a direct-drive motor for an oil pump is proposed. Summary of the invention

[0005] The object of the present invention is to provide a direct-drive motor for an oil pump to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides a direct-drive motor for an oil pump, comprising an electric drive assembly and a transmission assembly arranged at the bottom of the electric drive assembly, wherein: The electric drive assembly includes an electromagnetic coil structure for providing power and a transfer shaft connected to the electromagnetic coil structure; The transmission component includes a second shell and a composite structure and an output shaft arranged in the second shell. The bottom of the second shell is connected to the bottom of the electromagnetic coil structure. The composite structure includes a movable control body and a pair of power transmission bodies connected to the control body. One of the power transmission bodies is connected to the adapter shaft, and the other power transmission body is connected to the output shaft. The output shaft is connected to the end of the input shaft of the oil pump screw pump. The force on the power transmission body will drive the control body to move in the second shell, and control the two power transmission bodies to switch from a rigid connection to a flexible connection, so as to avoid damage to the direct drive motor and the input shaft of the oil pump screw pump.

[0007] As a further improvement of the present technical solution, the electromagnetic coil structure includes a first shell, the bottom of the first shell is flange-connected to the top of the second shell, a stator is fixedly arranged at the inner edge of the first shell, a rotor is rotatably connected to the middle of the first shell, and the bottom of the rotor is connected to the adapter shaft.

[0008] As a further improvement of the present technical solution, the two power transmission bodies each include a middle plate and end plates arranged at the upper and lower ends of the middle plate, the outer walls of the middle plate and the end plates are connected to the inner wall of the control body, the top of the power transmission body located above is connected to the bottom of the adapter shaft, and the bottom of the middle plate of the power transmission body located below is connected to the top of the output shaft.

[0009] As a further improvement of the present technical solution, a first disk groove is opened on the outer walls of the middle disk and the end disk, the control body includes a control cylinder located in the second shell, a fixed shaft is provided on the inner wall of the control cylinder, the fixed shaft is slidably connected to the first disk groove, an outer wall ring is symmetrically provided on the side of the middle disk, a plug-in baffle rod is provided on the outer wall ring, and the baffle rod is connected to the surface of the baffle rod through a second spring.

[0010] As a further improvement of the present technical solution, the first disk groove is an "X"-shaped groove.

[0011] As a further improvement of the present technical solution, the outer wall of the output shaft is rotatably connected to the inner wall of the second shell.

[0012] As a further improvement of the present technical solution, the outer wall of the control cylinder is rotatably connected to a control ring, the outer wall of the control ring is slidably connected to the inner wall of the second shell up and down, a plurality of first springs are symmetrically arranged on the upper and lower surfaces of the control ring, and the control ring is connected to the inner wall of the second shell through the arranged first springs.

[0013] As a further improvement of the present technical solution, the middle plate is provided with a second plate groove running through its upper and lower surfaces, the second plate groove is provided with a third spring, the end plate passes through the second plate groove, and the second plate groove is connected to the surface of the end plate through the third spring.

[0014] As a further improvement of the technical solution, a rotating shaft is provided at the bottom of the rotor, the top of the adapter shaft is located inside the rotating shaft, and the top end of the adapter shaft is snap-fitted with the inner wall of the rotating shaft.

[0015] As a further improvement of the technical solution, the length of the blocking rod is consistent with the distance between the upper and lower ends of the first disk slot.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the direct-drive motor of the oil pump, when the load is small, the two power transmission bodies are rigidly connected, and the electromagnetic coil structure can directly drive the input shaft of the oil pump screw pump through the adapter shaft, the composite structure and the output shaft, so as to reduce the output loss of the direct-drive motor and respond quickly to the adjustment of the screw pump; when the load becomes larger, the force on the power transmission body will drive the control body to move, and control the two power transmission bodies to switch from a rigid connection to a flexible connection, so as to be able to perform buffering and avoid damage to the direct-drive motor and the input shaft of the oil pump screw pump.

[0017] 2. In the direct-drive motor of the oil pump, after converting to a flexible connection, the control cylinder is pushed by the force to move vertically and horizontally. During the vertical movement, the control cylinder overcomes the elastic force of the first spring and slides up and down. During the horizontal movement, the control cylinder overcomes the elastic force of the second spring and the third spring to move, thereby improving the buffering effect of the impact load.

[0018] 3. In the direct-drive motor of the oil pump, when the load on the device is greater than the upper limit of the buffer, when the fixed axis moves to the highest point of the first disc groove, the middle disc just moves to the top of the adapter shaft to disengage from the rotating shaft and is not engaged with the rotating shaft, thereby disconnecting the transmission connection between the direct-drive motor and the oil pump screw pump, avoiding structural damage to the direct-drive motor and the oil pump screw pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is the overall cross-sectional structure diagram of the present invention; Figure 3 The electric drive assembly structure of the present invention Figure 1 ; Figure 4 The electric drive assembly structure of the present invention Figure 2 ; Figure 5 is a cross-sectional structural diagram of a transmission component of the present invention; Figure 6 is a cross-sectional view of the composite structure of the present invention; Figure 7 It is a cross-sectional structural diagram of the control body of the present invention; Figure 8 It is the overall structure diagram of the power transmission body of the present invention; Fig. 9 It is a cross-sectional structural diagram of the power transmission body of the present invention.

[0020] The meaning of each number in the figure is: 1. Electric drive assembly; 11. First housing; 12. Stator; 13. Rotor; 131. Rotating shaft; 14. Adapter shaft; 2. Transmission assembly; 21. Second shell; 22. Composite structure; 221. Control body; 2211. Control cylinder; 2212. Fixed axis; 2213. Control ring; 2214. First spring; 222. Power transmission body; 2221. Middle disk; 2222. End disk; 2223. First disk groove; 2224. Outer wall ring; 2225. Stop rod; 2226. Second spring; 2227. Second disk groove; 2228. Third spring; 23. Output shaft. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-2 As shown, the purpose of this embodiment is to provide a direct-drive motor for an oil pump, comprising an electric drive component 1 and a transmission component 2 arranged at the bottom of the electric drive component 1, wherein: The electric drive assembly 1 includes an electromagnetic coil structure for providing power and a transfer shaft 14 connected to the electromagnetic coil structure; The transmission component 2 includes a second shell 21 and a composite structure 22 and an output shaft 23 arranged in the second shell 21. The bottom of the second shell 21 is connected to the bottom of the electromagnetic coil structure. The composite structure 22 includes a movable control body 221 and a pair of power transmission bodies 222 connected to the control body 221. One power transmission body 222 is connected to the adapter shaft 14, and the other power transmission body 222 is connected to the output shaft 23. The output shaft 23 is connected to the end of the input shaft of the oil pumping unit. When adjusting the operating speed of the oil pumping unit, the load on the motor and the end of the input shaft of the oil pumping unit will change. When the load is small, the two power transmission bodies are connected. The power transmission body 222 is rigidly connected through the control body 221, and the electromagnetic coil structure can directly drive the input shaft of the oil pump screw pump through the adapter shaft 14, the composite structure 22 and the output shaft 23, so as to reduce the output loss of the direct-drive motor and quickly respond to the adjustment of the screw pump; when the load becomes large and approaches the limit that the direct-drive motor and the input shaft of the oil pump screw pump can withstand, the force on the power transmission body 222 will drive the control body 221 to move in the second shell 21, and control the two power transmission bodies 222 to switch from a rigid connection to a flexible connection, so as to be able to perform buffering and avoid damage to the direct-drive motor and the input shaft of the oil pump screw pump.

[0023] The above structure is disclosed as follows: like Figure 3 As shown, the electromagnetic coil structure includes a first shell 11, the bottom of the first shell 11 is flange-connected to the top of the second shell 21, a stator 12 is fixedly arranged at the inner edge of the first shell 11, a rotor 13 is rotatably connected to the middle of the first shell 11, and a transfer shaft 14 is connected to the bottom of the rotor 13. When the electromagnetic coil structure is energized, the stator 12 generates a magnetic field through electromagnetic induction, and then drives the rotor 13 under the force of the magnetic field, and then outputs power through the transfer shaft 14.

[0024] The adapter shaft 14 then directly drives the input shaft of the screw pump of the oil pumping unit through the composite structure 22 and the output shaft 23. Figure 5-8As shown, the two power transmission bodies 222 both include a middle plate 2221 and end plates 2222 arranged at the upper and lower ends of the middle plate 2221. The outer walls of the middle plate 2221 and the end plates 2222 are connected to the inner wall of the control body 221. In order to avoid confusion, when the structure of the upper power transmission body 222 is specifically referred to, the structure name is suffixed A, and when the structure of the lower power transmission body 222 is specifically referred to, the structure name is suffixed B. The top of the middle plate 2221A passes through the end plate 2222A to be connected to the bottom of the adapter shaft 14, and the bottom of the middle plate 2221B passes through the end plate 2222B to be connected to the top of the output shaft 23. At this time, the power transmission body 222A and the power transmission body 222B are rigidly connected through the control body 221. The adapter shaft 14 drives the output shaft 23 to directly drive the input shaft of the oil pump screw pump through the power transmission body 222A, the control body 221 and the power transmission body 222B, which has the effect of reducing the output loss of the direct-drive motor and being able to quickly respond to the adjustment of the screw pump.

[0025] When adjusting the speed of the screw pump, the load on the motor and the end of the input shaft of the screw pump will change. In order to avoid structural damage caused by increased load, such as Figure 5-8As shown, the outer walls of the middle plate 2221 and the end plate 2222 are provided with a first plate groove 2223, the control body 221 includes a control cylinder 2211 located in the second housing 21, the inner wall of the control cylinder 2211 is provided with a fixed shaft 2212, the fixed shaft 2212 is located in the first plate groove 2223, the fixed shaft 2212 is slidably connected with the first plate groove 2223, the side of the middle plate 2221 is symmetrically provided with an outer wall ring 2224, and the outer wall ring 2224 is provided with a plug-in matching stopper 222 5. The blocking rod 2225 is connected to the surface of the blocking rod 2225 through the second spring 2226. When the two power transmission bodies 222 are rigidly connected to the control body 221, the fixed shaft 2212 is stuck in the first disc groove 2223 by the blocking rods 2225 on both sides. At this time, the rotation of one power transmission body 222 can drive the rotation of the other power transmission body 222 through the control body 221. When the load increases to a value close to that of the direct drive motor and the output of the screw pump of the oil pumping unit, the fixed shaft 2212 is locked by the blocking rods 2225 on both sides in the first disc groove 2223. When the input shaft reaches the limit that it can withstand, the force on the two power transmission bodies 222 will drive the fixed shaft 2212 of the control body 221 to push the blocking rod 2225 to overcome the elastic force of the second spring 2226 and move. In addition, the first disc groove 2223 is an "X"-shaped groove, and the fixed shaft 2212 itself moves to the left or right along the first disc groove 2223, so that the two power transmission bodies 222 are no longer rigidly connected through the control body 221. During the movement of the fixed shaft 2212, the second spring 2226 absorbs energy for buffering, thereby avoiding structural damage to the direct-drive motor and the input shaft of the oil pumping unit due to excessive load. In this process, in order to ensure the stable operation of the composite structure 22 in the second shell 21, the outer wall of the output shaft 23 is rotatably connected to the inner wall of the second shell 21, so that the composite structure 22 can only rotate about the axis of the adapter shaft 14 and the output shaft 23, thereby ensuring the stable operation of the composite structure 22 in the second shell 21.

[0026] Furthermore, after the two power transmission bodies 222 are changed from rigid connection to flexible connection, in order to improve the buffering effect of the impact load, Figure 5 , Figure 7 As shown, the outer wall of the control cylinder 2211 is rotatably connected to the control ring 2213, the outer wall of the control ring 2213 is slidably connected to the inner wall of the second shell 21, and a plurality of first springs 2214 are symmetrically arranged on the upper and lower surfaces of the control ring 2213. The control ring 2213 is connected to the inner wall of the second shell 21 through the arranged first springs 2214. In addition, as shown in FIG. Fig. 9As shown, the middle plate 2221 is provided with a second plate groove 2227 that runs through its upper and lower surfaces, the second plate groove 2227 is provided with a third spring 2228, the end plate 2222 passes through the second plate groove 2227, and the second plate groove 2227 is connected to the surface of the end plate 2222 by the third spring 2228. After the flexible connection is converted, the control cylinder 2211 is pushed by the force so that the fixed axis 2212 moves in the first plate groove 2223. During the control cylinder 2211 itself moves vertically and horizontally. During the vertical movement, the control cylinder 2211 will drive the control ring 2213 to overcome the elastic force of the first spring 2214 and move up and down along the inner wall of the second shell 21 During the lateral movement, when the control cylinder 2211 drives the fixed shaft 2212 to move along the first disk groove 2223 and is located on the surface section of the middle disk 2221, it overcomes the elastic force of the second spring 2226. As the control cylinder 2211 continues to move with the fixed shaft 2212, the fixed shaft 2212 enters the first disk groove 2223 and is located on the surface end of the end disk 2222. At this time, because the end disk 2222 overcomes the elastic force of the third spring 2228 in the second disk groove 2227, it rotates relative to the middle disk 2221, that is, the fixed shaft 2212 overcomes the elastic force of the second spring 2226 and the third spring 2228 and moves, thereby improving the buffering effect of the impact load.

[0027] Considering that the buffering capacity of the device is limited, when the load on the device is greater than the buffering upper limit, it is necessary to disconnect the transmission connection between the direct drive motor and the screw pump of the oil pumping unit, such as Figure 4 As shown, a rotating shaft 131 is provided at the bottom of the rotor 13, and the top of the adapter shaft 14 is located in the rotating shaft 131, and the top of the adapter shaft 14 is engaged with the inner wall of the rotating shaft 131. During buffering, when the control cylinder 2211 moves vertically, the fixed shaft 2212 moves in the first disc groove 2223 and also drives the middle disc 2221 to move vertically. When the fixed shaft 2212 moves to the highest point of the first disc groove 2223, the middle disc 2221 just moves to the position where the top of the adapter shaft 14 is separated from the rotating shaft 131 and is not engaged with the rotating shaft 131, thereby disconnecting the direct drive motor from the oil pumping. The transmission connection of the screw pump of the oil pumping unit is realized until the screw pump of the oil pumping unit stops completely, and the top of the adapter shaft 14 is re-inserted into the rotating shaft 131 to realize the transmission connection between the direct-drive motor and the screw pump of the oil pumping unit. In this process, it is necessary to ensure that the baffle rod 2225 can push the fixed shaft 2212 back to its original position along the first disc groove 2223. Therefore, the length of the baffle rod 2225 is consistent with the distance between the upper and lower ends of the first disc groove 2223, which can avoid the problem of the fixed shaft 2212 detaching from the two ends of the baffle rod 2225 due to the length of the baffle rod 2225 being shorter than the distance between the upper and lower ends of the first disc groove 2223.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The direct drive motor of the oil pump is characterized by: It comprises an electric drive component (1) and a transmission component (2) arranged at the bottom of the electric drive component (1), wherein: The electric drive assembly (1) comprises an electromagnetic coil structure for providing power and a transfer shaft (14) connected to the electromagnetic coil structure; The transmission component (2) comprises a second housing (21), a composite structure (22) and an output shaft (23) arranged in the second housing (21); the bottom of the second housing (21) is connected to the bottom of the electromagnetic coil structure; the composite structure (22) comprises a movable control body (221) and a pair of power transmission bodies (222) connected to the control body (221); one of the power transmission bodies (222) is connected to the adapter shaft (14); the other of the power transmission bodies (222) is connected to the output shaft (23); the output shaft (23) is connected to the end of the input shaft of the oil pumping unit screw pump; the force acting on the power transmission body (222) drives the control body (221) to move in the second housing (21), controls the two power transmission bodies (222) to switch from a rigid connection to a flexible connection, and avoids damage to the direct drive motor and the input shaft of the oil pumping unit screw pump.

2. The direct drive motor for an oil pump according to claim 1, characterized in that: The electromagnetic coil structure comprises a first shell (11), the bottom of the first shell (11) is flange-connected to the top of the second shell (21), a stator (12) is fixedly arranged at the inner edge of the first shell (11), a rotor (13) is rotatably connected to the middle of the first shell (11), and the bottom of the rotor (13) is connected to the adapter shaft (14).

3. The direct drive motor for an oil pump according to claim 1, characterized in that: The two power transmission bodies (222) each comprise a middle plate (2221) and end plates (2222) arranged at the upper and lower ends of the middle plate (2221); the outer walls of the middle plate (2221) and the end plates (2222) are both connected to the inner wall of the control body (221); the top of the power transmission body (222) located at the upper end is connected to the bottom of the adapter shaft (14); and the bottom of the middle plate (2221) of the power transmission body (222) located at the lower end is connected to the top of the output shaft (23).

4. The direct drive motor for an oil pump according to claim 3, characterized in that: The outer walls of the middle plate (2221) and the end plate (2222) are provided with a first plate groove (2223); the control body (221) comprises a control cylinder (2211) located in the second shell (21); the inner wall of the control cylinder (2211) is provided with a fixed shaft (2212); the fixed shaft (2212) is slidably connected to the first plate groove (2223); the side of the middle plate (2221) is symmetrically provided with an outer wall ring (2224); the outer wall ring (2224) is provided with a plug-in blocking rod (2225); the blocking rod (2225) is connected to the surface of the blocking rod (2225) via a second spring (2226).

5. The direct drive motor for an oil pump according to claim 4, characterized in that: The first disk groove (2223) is an "X"-shaped groove.

6. The direct drive motor for an oil pump according to claim 1, characterized in that: The outer wall of the output shaft (23) is rotatably connected to the inner wall of the second housing (21).

7. The direct drive motor for an oil pump according to claim 5, characterized in that: The outer wall of the control cylinder (2211) is rotatably connected to a control ring (2213); the outer wall of the control ring (2213) is slidably connected to the inner wall of the second shell (21) in an up-and-down manner; a plurality of first springs (2214) are symmetrically arranged on the upper and lower surfaces of the control ring (2213); and the control ring (2213) is connected to the inner wall of the second shell (21) via the arranged first springs (2214).

8. The direct drive motor for an oil pump according to claim 7, characterized in that: The middle plate (2221) is provided with a second plate groove (2227) penetrating the upper and lower surfaces thereof, the second plate groove (2227) is provided with a third spring (2228), the end plate (2222) passes through the second plate groove (2227), and the second plate groove (2227) is connected to the surface of the end plate (2222) via the third spring (2228).

9. The direct drive motor for an oil pump according to claim 2, characterized in that: A rotating shaft (131) is provided at the bottom of the rotor (13), the top of the transfer shaft (14) is located inside the rotating shaft (131), and the top of the transfer shaft (14) is snap-fitted with the inner wall of the rotating shaft (131).

10. The direct drive motor for an oil pump according to claim 4, characterized in that: The length of the blocking rod (2225) is consistent with the distance between the upper and lower ends of the first disk slot (2223).

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