A screw pump ground device driven by an outer rotor of a wheel hub motor

Abstract

A kind of screw pump ground device of hub motor outer rotor drive, including wellhead device, sealing box, anti-reverse device, hub motor, square clamp and polish rod connected in sequence;The hub motor includes motor rotor, motor stator, motor upper end cover and motor lower end cover, motor stator lower end is connected and fixed with the brake chassis of anti-reverse device, motor stator is located in the inside of motor rotor, motor lower end cover is connected and fixed with brake disc, motor rotor is connected with motor lower end cover and motor upper end cover respectively, motor upper end cover is connected with the upper end of motor stator and square clamp;The present application uses hub motor to replace the power mechanism, transmission mechanism and anti-reverse mechanism of traditional driving device, using hub motor, not only can direct drive, speed change at any time to improve overall efficiency, and power mechanism, transmission mechanism, anti-reverse mechanism are integrated, to simplify the structure of driving device, reduce overall volume and quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screw pump oil production system, in particular to a wheel hub motor outer rotor driven screw pump ground device. BACKGROUND

[0002] Compared with other conventional rod pumping equipment and electric submersible centrifugal pumps, the screw pump shows greater advantages in the exploitation of heavy oil wells, high sand content wells and gas wells. At present, the driving device of most domestic oilfield ground driven screw pump oil production systems includes motor, reduction box, anti-reverse mechanism, sealing system, wellhead support system and safety protection system. Therefore, the whole driving device is large and complex in structure. Secondly, due to the use of belt and reduction box transmission, on the one hand, the speed cannot be adjusted at any time, and on the other hand, the transmission efficiency is relatively low. SUMMARY

[0003] In order to solve the above technical problems, the purpose of the present application is to provide a wheel hub motor outer rotor driven screw pump ground device, which uses a wheel hub motor instead of a traditional power mechanism, transmission mechanism and anti-reverse mechanism. The wheel hub motor can not only directly drive and adjust the speed at any time to improve the overall efficiency, but also integrate the power mechanism, transmission mechanism and anti-reverse mechanism to simplify the structure of the driving device and reduce the overall volume and mass.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0005] A wheel hub motor outer rotor driven screw pump ground device, comprising a wellhead device, a sealing box, an anti-reverse device, a wheel hub motor, a square clamp 15 and a polished rod 16.

[0006] The wellhead device comprises an oil pipe 1 buried in the soil, the upper end of the oil pipe 1 is connected with the lower end of an oil pipe cross 2, the upper end of the oil pipe cross 2 is connected with the lower end of a well packer 3, and the upper end of the well packer 3 is connected with the lower end cover 4 of the sealing box.

[0007] The sealing box comprises a sealing box lower end cover 4, a sealing box body 5 and a sealing box upper end cover 6, the two ends of the sealing box body 5 are connected with the sealing box lower end cover 4 and the sealing box upper end cover 6 respectively, and the sealing box upper end cover 6 is connected with the brake chassis 8 of the anti-reverse device.

[0008] The anti-reverse device comprises a brake chassis 8, a brake support 7 and a brake disc 10, the brake support 7 is fixed on the outer side of the brake chassis 8, the brake disc 10 is arranged in the clamping groove at the upper end of the brake support 7, and the brake disc 10 is connected with the wheel hub motor.

[0009] The hub motor comprises a motor rotor 13, a motor stator 9, a motor upper end cover 14 and a motor lower end cover 11, the lower end of the motor stator 9 is fixedly connected with the brake chassis 8, the motor stator 9 is located inside the motor rotor 13, the motor lower end cover 11 is fixedly connected with the brake disc 10, the two ends of the motor rotor 13 are respectively connected with the motor lower end cover 11 and the motor upper end cover 14, the motor upper end cover 14 is connected with the upper end of the motor stator 9 and the square clamp 15, the lower end of the square clamp 15 is connected with the motor upper end cover 14, the center of the square clamp 15 is fixedly connected with one end of the polished rod 16, the other end of the polished rod 16 is fixedly connected with the sucker rod in the oil well after being inserted into the inside of the shaft of the hub motor stator 9.

[0010] The upper end of the oil pipe 1 is connected with the lower end of the oil pipe cross 2, and a sealing ring is arranged at the connection position for sealing, and the connection is fixed by bolts.

[0011] The upper end of the oil pipe cross 2 is connected with the lower end of the well packer 3, and a sealing ring is arranged at the connection position for sealing, and the connection is fixed by bolts.

[0012] The upper end of the well packer 3 is connected with the lower end cover 4 of the sealing box, and a sealing ring is arranged at the connection position for sealing.

[0013] The lower end cover 4 of the sealing box, the sealing box body 5 and the upper end cover 6 of the sealing box are all connected with sealing rings for sealing.

[0014] The motor lower end cover 11, the motor rotor 13 and the motor upper end cover 14 are fixedly connected by bolts, and sealing rings are arranged at the connection positions for sealing.

[0015] The upper end of the well packer 3, the lower end cover 4 of the sealing box and the sealing box body 5 are fixedly connected by bolts.

[0016] The upper end cover 6 of the sealing box is fixedly connected with the brake chassis 8 by bolts.

[0017] The brake disc 10 is fixedly connected with the lower end cover 11 of the hub motor by bolts, and the brake disc 10 is just located in the position between the clamping grooves arranged at the upper end of the brake support 7.

[0018] The brake support 7 is fixedly connected with the circumference of the brake chassis 8 by bolts, and the clamping grooves at the upper end of the brake support 7 are also provided with telescopic electromagnetic brake heads.

[0019] The motor upper end cover 14 is connected with the square clamp 15 by a mortise and tenon structure.

[0020] The lifting ring 12 arranged outside the hub motor rotor 13.

[0021] The lower end of the hub motor stator 9 is installed in the hole arranged on the brake chassis 8 and is fixedly connected by screws.

[0022] The wheel hub motor stator 9 is combined with the wheel hub motor lower end cover 11, and a thrust ball bearing 17 and a tapered roller bearing 18 are installed from bottom to top.

[0023] The wheel hub motor stator 9 is combined with the wheel hub motor upper end cover 14, and a tapered roller bearing 18 and a thrust ball bearing 17 are installed from bottom to top.

[0024] The beneficial effects of the present application are:

[0025] (1) The present application uses a wheel hub motor to drive oil production, instead of the speed change mechanism and transmission mechanism of the traditional driving device, which not only simplifies the structure, but also improves the efficiency and reduces the overall volume and mass.

[0026] (2) By utilizing the characteristics of the wheel hub motor, the speed can be adjusted in real time according to the oil well production, and remote speed control can also be realized.

[0027] (3) The wheel hub motor outer rotor drive has the characteristics of low speed and large torque, so the wheel hub motor outer rotor drive screw pump does not need to be equipped with a reducer.

[0028] (4) The driving device is equipped with a new type of anti-reverse device, which not only can automatically release torque, but also has simple structure, safety and reliability.

[0029] (5) Compared with other driving devices in the past, the wheel hub motor driving device has small vibration and low noise, which is more conducive to oil well ground fault detection and diagnosis work. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure front view of the assembly body of the present application.

[0031] Figure 2 It is a structure sectional view of the assembly body of the present application. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in combination with the drawings:

[0033] Referring to Figure 1 A wheel hub motor outer rotor driven screw pump ground device, comprising a wellhead device, a sealing box, an anti-reverse device, a wheel hub motor, a square clamp 15 and a polished rod 16.

[0034] The wellhead device comprises an oil pipe 1 buried in the soil, the upper end of the oil pipe 1 is connected with the lower end of an oil pipe cross 2, the upper end of the oil pipe cross 2 is connected with the lower end of a well packer 3, and the upper end of the well packer 3 is connected with the lower end cover 4 of the sealing box.

[0035] The sealing box comprises a sealing box lower end cover 4, a sealing box body 5 and a sealing box upper end cover 6, the sealing box body 5 is connected with the sealing box lower end cover 4 and the sealing box upper end cover 6 at both ends respectively, and the sealing box upper end cover 6 is connected with the brake chassis 8 of the anti-reverse device;

[0036] The anti-reverse device comprises the brake chassis 8, the brake support 7 and the brake disc 10, the brake support 7 is fixed outside the brake chassis 8, the brake disc 10 is arranged in the clamping groove at the upper end of the brake support 7, and the brake disc 10 is connected with the wheel hub motor;

[0037] The wheel hub motor comprises a motor rotor 13, a motor stator 9, a motor upper end cover 14 and a motor lower end cover 11, the motor stator 9 is fixedly connected with the brake chassis 8 at the lower end, the motor stator 9 is located inside the motor rotor 13, the electric wire is connected with the motor stator coil through the hole in the motor stator 9, the motor lower end cover 11 is fixedly connected with the brake disc 10, the two ends of the motor rotor 13 are connected with the motor lower end cover 11 and the motor upper end cover 14 respectively, the motor upper end cover 14 is connected with the upper end of the motor stator 9 and the square clamp 15, the lower end of the square clamp 15 is connected with the motor upper end cover 14, the center of the square clamp 15 is fixedly connected with one end of the polished rod 16, the other end of the polished rod 16 is inserted into the axis of the wheel hub motor stator 9 and then fixedly connected with the sucker rod in the oil well.

[0038] The sealing ring is arranged at the connection between the upper end of the oil pipe 1 and the lower end of the oil pipe cross 2, and is fixed by bolts.

[0039] The sealing ring is arranged at the connection between the upper end of the oil pipe cross 2 and the lower end of the well packer 3, and is fixed by bolts.

[0040] The sealing ring is arranged at the connection between the upper end of the well packer 3 and the sealing box lower end cover 4.

[0041] The sealing ring is arranged at the connection between the sealing box lower end cover 4, the sealing box body 5 and the sealing box upper end cover 6.

[0042] The sealing box lower end cover 4, the sealing box body 5 and the sealing box upper end cover 6 are fixed by bolts.

[0043] The sealing box upper end cover 6 and the brake chassis 8 are fixed by bolts.

[0044] The telescopic electromagnetic brake head is further arranged in the clamping groove of the brake disc 10 at the upper end of the brake support 7, the electromagnetic brake head is connected with the electric wire and realizes the telescopic function by power supply, and the electromagnetic brake head blocks the brake disc 10; and the brake support 7 is fixed on the circumference of the brake chassis 8 by two bolts.

[0045] The brake disc 10 is fixed to the lower end cover of the wheel hub motor by bolt connection, and is just in the appropriate position between the clamping slots set on the upper end of the brake support 7.

[0046] The lower end cover of the motor 11, the motor rotor 13 and the upper end cover of the motor 14 are fixed by bolt connection, and a sealing ring is arranged at the connection for sealing.

[0047] The upper end cover of the motor 14 is connected with the square clamp 15 by mortise and tenon structure.

[0048] The lifting ring 12 arranged on the outer side of the wheel hub motor rotor 13 is used for the installation, maintenance and hoisting of the wheel hub motor during well repair operation.

[0049] The wheel hub motor stator 9 is internally bored at the axial center, and the polished rod 16 is installed in the inside.

[0050] The lower end of the wheel hub motor stator 9 is installed in the hole arranged on the brake chassis 8, and is fixed by screw connection.

[0051] Referring to Figure 2 , the wheel hub motor stator 9 is combined with the lower end cover of the wheel hub motor 11, and the thrust ball bearing 17 and the tapered roller bearing 18 are respectively installed from bottom to top.

[0052] The wheel hub motor stator 9 is combined with the upper end cover of the wheel hub motor 14, and the tapered roller bearing 18 and the thrust ball bearing 17 are respectively installed from bottom to top.

[0053] The working principle of the present application is as follows:

[0054] When the wheel hub motor stator 9 is powered by the wire, the wheel hub motor rotor 13 starts to rotate forward rapidly under the action of the magnetic field, and the brake disc 10 connected with the lower end cover of the wheel hub motor 11 also rotates, and the square clamp 15 connected with the upper end cover of the wheel hub motor 14 also rotates, and the polished rod 16 fixed in the middle of the square clamp 15 also starts to rotate forward, and the polished rod 16 transmits power to the sucker rod connected therewith, and finally transmits power to the downhole screw pump connected with the sucker rod, so that the downhole screw pump starts to rotate forward. The wellhead device on the ground plays a role in fixing and supporting the driving device, the sealing box installed on the upper end of the well packer 3 is used to prevent the oil in the oil pipe from flowing out along the polished rod, and the brake chassis 8 and the brake support 7 located on the upper end of the sealing box are in a static state. The lower end of the wheel hub motor stator 9 is fixedly connected with the brake chassis 8, which on the one hand keeps static with the brake chassis 8, the sealing box and the wellhead device, and on the other hand supports the pressure brought by the wheel hub motor, the square clamp 15 and the polished rod 16.

[0055] When the power is suddenly cut off, due to the screw pump in operation, the sucker rod column accumulates a part of the deformation energy, plus the liquid level depth and the height difference of the liquid in the tubing, so the sucker rod will be high-speed reverse rotation with the polished rod 16. Using the feature of reverse rotation of the wheel hub motor will generate induced current, the current generated is transmitted to the voltage stabilizer connected by the wire, and then preferentially transmitted to the electromagnetic brake head of the brake support 7, and the rest of the current is consumed by the external resistance. During reverse rotation, the electromagnetic brake head configured on the upper end of the brake support 7 will automatically extend and retract under the control of the current, and will be in different degrees of friction contact with the brake disc 10, which can force the brake disc 10 to rotate slowly in the opposite direction, thereby achieving the effect of automatically releasing the torque.

Claims

1. A ground device of a screw pump driven by an outer rotor of a wheel hub motor, characterized in that, It comprises a wellhead device, a sealing box, an anti-reverse device, a wheel hub motor, a square clamp (15) and a polished rod (16). The wellhead device comprises a buried oil pipe (1) in the soil, the upper end of the oil pipe (1) is connected with the lower end of the oil pipe cross (2), the upper end of the oil pipe cross (2) is connected with the lower end of the well packer (3), and the upper end of the well packer (3) is connected with the lower end cover (4) of the sealing box. The sealing box comprises a lower end cover (4), a sealing box body (5) and an upper end cover (6), the two ends of the sealing box body (5) are connected with the lower end cover (4) and the upper end cover (6) respectively, and the upper end cover (6) is connected with the brake chassis (8) of the anti-reverse device. The anti-reverse device comprises a brake chassis (8), a brake support (7) and a brake disc (10), the brake support (7) is fixed on the outer side of the brake chassis (8), the brake disc (10) is arranged in the clamping groove at the upper end of the brake support (7), and the brake disc (10) is connected with the wheel hub motor. The wheel hub motor comprises a motor rotor (13), a motor stator (9), a motor upper end cover (14) and a motor lower end cover (11), the lower end of the motor stator (9) is connected and fixed with the brake chassis (8), the motor stator (9) is located in the motor rotor (13), the motor lower end cover (11) is connected and fixed with the brake disc (10), the two ends of the motor rotor (13) are connected with the motor lower end cover (11) and the motor upper end cover (14) respectively, the motor upper end cover (14) is connected with the upper end of the motor stator (9) and the square clamp (15), the lower end of the square clamp (15) is connected with the motor upper end cover (14), the center of the square clamp (15) is fixedly connected with one end of the polished rod (16), the other end of the polished rod (16) is inserted into the shaft center of the wheel hub motor stator (9) and then connected and fixed with the sucker rod in the oil well. A sealing ring is arranged at the connection between the upper end of the oil pipe (1) and the lower end of the oil pipe cross (2) for sealing, and the connection is fixed by bolts. A sealing ring is arranged at the connection between the upper end of the oil pipe cross (2) and the lower end of the well packer (3) for sealing, and the connection is fixed by bolts. A sealing ring is arranged at the connection between the upper end of the well packer (3) and the lower end cover (4) of the sealing box for sealing. Sealing rings are arranged at the connections between the lower end cover (4), the sealing box body (5) and the upper end cover (6) of the sealing box for sealing. The motor lower end cover (11), the motor rotor (13) and the motor upper end cover (14) are fixed by bolts, and sealing rings are arranged at the connections for sealing. The clamping groove of the brake support (7) at the upper end of which the brake disc (10) is installed is further provided with a telescopic electromagnetic brake head, and the brake support (7) is fixed on the circumference of the brake chassis (8) by bolts. The wheel hub motor stator (9) and the wheel hub motor lower end cover (11) are respectively provided with a thrust ball bearing (17) and a tapered roller bearing (18) from bottom to top. The wheel hub motor stator (9) and the wheel hub motor upper end cover (14) are respectively provided with a tapered roller bearing (18) and a thrust ball bearing (17) from bottom to top.

2. A screw pump ground engaging device driven by an outer rotor of an in-wheel motor according to claim 1, characterized in that, The upper end of the well packer (3), the lower end cover (4) of the sealing box and the sealing box body (5) are fixed by bolts. The upper end cover (6) of the sealed box is fixed to the brake chassis (8) by bolt connection.

3. A screw pump ground engaging device driven by an outer rotor of an in-wheel motor according to claim 1, characterized in that, The brake disc (10) is fixed to the lower end cover (11) of the wheel hub motor by bolt connection, and the brake disc (10) is just positioned between the clamping grooves arranged at the upper end of the brake support (7).

4. A screw pump ground engaging device driven by an outer rotor of an in-wheel motor according to claim 1, characterized in that, The upper end cover (14) of the motor is connected with the square clamping piece (15) by mortise and tenon structure.

5. A screw pump ground engaging device driven by an outer rotor of an in-wheel motor according to claim 1, characterized in that, The lifting ring (12) arranged outside the rotor (13) of the wheel hub motor.

6. A wheel-hub-motor outer rotor driven screw-pump ground device according to claim 1, characterized in that The lower end of the stator (9) of the wheel hub motor is installed in the hole arranged on the brake chassis (8), and is fixed by screw connection.

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