All-metal screw motor

Abstract

The invention relates to the technical field of drilling equipment, in particular to an all-metal screw motor which comprises a stator shell, a motor stator and a motor rotor, the motor rotor is rotatably installed in the motor stator, the motor rotor is of a hollow structure, a liquid inlet is fixedly connected to the motor rotor, and a liquid outlet hole is formed in the motor rotor; a bypass valve structure is arranged at the top end of the stator shell, a connecting pipe is fixedly installed on a valve element of the bypass valve structure, the connecting pipe is connected into the liquid inlet, an upper connector is arranged on the bypass valve structure, a fixed turbine is arranged in a cavity of the motor rotor, a pushing structure is arranged on the motor stator, and a movable turbine is arranged in a cavity of the motor rotor. A ferromagnetic insertion rod is arranged at the bottom of the movable turbine, a bottom support is fixedly arranged in the cavity of the motor rotor, an insertion hole is formed in the bottom support, and a magnetic control structure is movably arranged on the stator shell; the screw motor is high in response speed, long in service life and high in adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to an all-metal screw motor. Background Art

[0002] Screw drilling tools are a type of drilling equipment used for oil well drilling, and they play an important role in the field of oil exploration. Screw drilling tools deliver the drill bit into the formation by rotating the screw, and at the same time transport rock debris and drilling fluid from the bottom of the well to the wellhead, thus achieving the purpose of oil well drilling. In screw drilling, the screw motor is one of the core components of the screw drilling tool, and plays an important role in rotating the drill bit and transporting materials.

[0003] The stators of existing screw motors are all made of metal shells and rubber linings, with low pressure bearing capacity, poor wear resistance, and poor high temperature resistance. Only the internal structure and technical parameters are different. Even some all-metal screw motors have stators without rubber linings and spiral surfaces inside the stators, which are a step up from ordinary screw drilling tools. However, with the emergence of a large number of horizontal wells, radial wells, and branch horizontal wells, especially high-temperature wells and geothermal wells, conventional screw drilling tools can no longer meet production needs. At the same time, due to the inertia of the rotor, its weight will reduce the response speed of the screw motor and deteriorate the performance of the screw motor. Summary of the invention

[0004] The object of the present invention is to provide an all-metal screw motor to achieve the purpose of providing a screw motor with high response speed, long service life and strong adaptability, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an all-metal screw motor, comprising a stator housing, a motor stator and a motor rotor, wherein the motor stator is fixedly installed in the stator housing, and the motor rotor is rotatably installed in the motor stator, the motor rotor adopts a hollow structure, and a liquid inlet is fixedly connected to the motor rotor, and a liquid outlet is provided on the motor rotor, a bypass valve structure is provided at the top end of the stator housing, and a connecting pipe is fixedly installed on the valve core of the bypass valve structure, and the connecting pipe is connected to the liquid inlet, an upper joint is provided on the bypass valve structure, and a fixed turbine is provided in the cavity of the motor rotor, A driving structure is provided on the motor stator, and the driving structure is connected to the liquid inlet. When the screw motor is started, the driving liquid can make the bypass valve structure close the bypass hole thereon, and drive the driving structure through the bypass valve structure, so that the driving structure drives the liquid inlet and the motor rotor to rotate. A movable turbine is provided in the cavity of the motor rotor, and a ferromagnetic plug rod is provided at the bottom of the movable turbine. A bottom bracket is fixedly provided in the cavity of the motor rotor, and a socket is provided on the bottom bracket. A magnetic control structure is movably provided on the stator housing, and the magnetic control structure can be fixed at a high position or a low position to control the position of the movable turbine.

[0006] Preferably, the motor stator adopts a seamless tube structure, and the stator shell is sleeved on the outside of the motor stator. The motor stator is provided with an inner groove, and the motor rotor is provided with an outer groove. A core shaft is provided in the inner groove and the outer groove.

[0007] Preferably, the liquid inlet is arranged at the top of the motor rotor, and the liquid inlet is arranged to rotate and penetrate the top of the motor stator, the liquid outlet is arranged at the bottom of the motor rotor, and a transmission shaft is arranged at the bottom end of the motor rotor, and the transmission shaft is connected to the universal shaft.

[0008] Preferably, the bypass valve structure comprises a bypass valve body, and a valve sleeve is arranged in the bypass valve body, a conical valve core is slidably mounted above the valve sleeve, and a spring is fixedly connected between the valve core and the valve sleeve.

[0009] Preferably, the upper joint is installed on the top of the bypass valve body, and the bypass hole is arranged on the side wall of the bypass valve body, the connecting pipe is installed on the bottom end of the valve core, and the connecting pipe is inserted into the liquid inlet.

[0010] Preferably, the pushing structure includes a friction wheel rotatably arranged on the motor stator, and also includes a spring guide rod fixedly mounted on the motor stator, a slide seat is movably mounted on the spring guide rod, and a friction push rod is arranged on the slide seat, and the friction wheel is connected between the outer wall of the liquid inlet and the friction push rod.

[0011] Preferably, a force-bearing rod is provided on the slide seat, and an external connecting rod is provided on the outer wall of the connecting tube, an inclined guide groove is provided on the external connecting rod, and the force-bearing rod is located in the inclined guide groove, so that the slide seat can be driven to move when the connecting tube moves downward.

[0012] Preferably, the movable turbine is arranged below the fixed turbine, and the ferromagnetic plug rod is arranged in an annular shape below the movable turbine, the base is located below the movable turbine, a through hole is arranged in the middle of the base, and the jack is arranged in an annular shape on the outer ring of the base.

[0013] Preferably, the magnetic control structure comprises a control ring sleeved on the stator housing, and a magnetic block is arranged on the control ring, a lower fixing part and an upper fixing part are arranged on the stator housing, and a positioning screw is installed on the control ring.

[0014] Preferably, the control ring is provided with symmetrically arranged upward and downward positioning screws, and the lower fixing member and the upper fixing member are both provided with through grooves, and the positioning screws are fixed to the lower fixing member and the upper fixing member by nuts.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The all-metal screw motor provided by the present invention has the characteristics of long life and high temperature resistance. It can be used to drill special process wells, such as high-temperature wells, geothermal wells, multi-branch wells, etc., and can adapt to the use of wells with complex well conditions. The motor stator and the motor rotor adopt circular motion, and there is no spiral surface inside the motor stator and outside the motor rotor, which greatly improves the sealing performance of the motor.

[0017] 2. The motor stator and motor rotor of the present invention are respectively provided with inner grooves and outer grooves that cooperate with each other, and are connected by a core shaft to ensure that the motor rotor can rotate concentrically in the motor stator. The screw motor is driven by liquid pressure. When the driving liquid enters the motor, it enters the interior of the motor rotor from the liquid inlet, and acts on the turbine structure therein, so that the motor rotor rotates in the motor stator, generating torque acting on the transmission shaft, and finally driving the drill to work through the universal shaft. The motor rotor is set as a hollow structure. On the one hand, the turbine structure is set therein, and on the other hand, its inertia can be reduced by reducing its weight, so that the difficulty of starting the motor is reduced.

[0018] 3. The present invention sets a bypass valve structure at the top of the motor, and the driving liquid enters the motor rotor after passing through the bypass valve structure. When the motor is started, the driving liquid can push the valve core downward to overcome the elastic force of the spring, and the bypass hole is closed through the valve core, forming a closed chamber in the motor, so that the liquid entering the motor rotor from the liquid inlet has enough pressure to drive the motor rotor to rotate. When the motor is closed, the bypass hole is in an open state, so that the drilling tool and the annulus are connected.

[0019] 4. The present invention can also use the downward movement of the valve core. When the motor rotor is initially stationary, a certain initial rotational force can be applied to the motor rotor using a propulsion structure, so that it can overcome inertia and have a certain initial velocity. After the liquid enters the motor rotor, it can rotate faster, thereby improving the response speed of the motor.

[0020] 5. The present invention uses a turbine structure in the motor rotor to withstand the pressure of the driving liquid, so that the motor rotor can rotate in the motor stator. The turbine structure is composed of a fixed turbine and a movable turbine. When both turbines are used, if the pressure of the driving liquid is increased, the motor rotor can rotate at a higher speed, thereby achieving the effect of increasing the upper limit of the motor power. If the motor only needs to rotate at a low speed, in order to ensure that the drive can be completed by a low flow rate of liquid, only the fixed turbine can be used, and the movable turbine can be adjusted to a failure state to reduce its influence on the liquid pressure. The use of the movable turbine is controlled by a magnetic control structure, which is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the motor stator and bypass valve structure of the present invention.

[0023] Figure 3 Schematic diagram of the stator housing structure of the present invention.

[0024] Figure 4 It is a cross-sectional view of the stator and rotor structure of the present invention.

[0025] Figure 5 Schematic diagram of the motor stator structure of the present invention.

[0026] Figure 6 Schematic diagram of the motor rotor structure of the present invention.

[0027] Figure 7 It is a first schematic diagram of the bypass valve structure of the present invention.

[0028] Figure 8 It is a second schematic diagram of the bypass valve structure of the present invention.

[0029] Fig. 9 It is a schematic diagram of the power assist structure of the present invention.

[0030] Fig.10 It is a schematic diagram of the movable turbine structure of the present invention.

[0031] In the figure: 1. stator housing; 2. motor stator; 3. motor rotor; 4. inner groove; 5. outer groove; 6. core shaft; 7. liquid inlet; 8. liquid outlet; 9. bypass valve body; 10. upper joint; 11. valve sleeve; 12. valve core; 13. spring; 14. connecting pipe; 15. bypass hole; 16. fixed turbine; 17. friction wheel; 18. spring guide rod; 19. slide seat; 20. friction push rod; 21. force rod; 22. external rod; 23. inclined guide groove; 24. movable turbine; 25. ferromagnetic plug rod; 26. bottom bracket; 27. socket; 28. control circle; 29. ​​magnetic block; 30. positioning screw; 31. lower fixing piece; 32. upper fixing piece; 33. transmission shaft; 34. universal shaft. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment. It should be noted that 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 making creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 10The present invention provides a technical solution: an all-metal screw motor, comprising a stator housing 1, a motor stator 2 and a motor rotor 3, wherein the motor stator 2 is fixedly installed in the stator housing 1, the motor rotor 3 is rotatably installed in the motor stator 2, the motor rotor 3 adopts a hollow structure, a liquid inlet 7 is fixedly connected to the motor rotor 3, a liquid outlet 8 is arranged on the motor rotor 3, a bypass valve structure is arranged at the top of the stator housing 1, a connecting pipe 14 is fixedly installed on the valve core 12 of the bypass valve structure, the connecting pipe 14 is connected to the liquid inlet 7, an upper joint 10 is arranged on the bypass valve structure, a fixed turbine 16 is arranged in the cavity of the motor rotor 3, and the motor stator 2 is provided with a pushing structure, which is connected to the liquid inlet 7. When the screw motor is started, the driving liquid can make the bypass valve structure close the bypass hole 15 thereon, and drive the pushing structure through the bypass valve structure, so that the pushing structure drives the liquid inlet 7 and the motor rotor 3 to rotate. A movable turbine 24 is provided in the cavity of the motor rotor 3, and a ferromagnetic plug rod 25 is provided at the bottom of the movable turbine 24. A bottom bracket 26 is fixedly provided in the cavity of the motor rotor 3, and a socket 27 is provided on the bottom bracket 26. A magnetic control structure is movably provided on the stator housing 1, and the magnetic control structure can be fixed at a high position or a low position to control the position of the movable turbine 24.

[0034] The motor stator 2 adopts a seamless tube structure. The stator housing 1 is sleeved on the outside of the motor stator 2. The motor stator 2 is provided with an inner groove 4. The motor rotor 3 is provided with an outer groove 5. A core shaft 6 is provided in the inner groove 4 and the outer groove 5.

[0035] The all-metal screw motor provided by the present invention has a motor stator 2 and a motor rotor 3 as its core, and has the characteristics of long life and high temperature resistance. It can be used to drill special process wells, such as high-temperature wells, geothermal wells, multi-branch wells, etc., and can adapt to the use of wells with complex well conditions. The motor stator 2 and the motor rotor 3 adopt circular motion, and there is no spiral surface inside the motor stator 2 and outside the motor rotor 3, which greatly improves the sealing performance of the motor. The motor stator 2 and the motor rotor 3 are respectively provided with inner grooves 4 and outer grooves 5 that cooperate with each other, and are connected by a core shaft 6 to ensure that the motor rotor 3 can rotate concentrically in the motor stator 2.

[0036] The liquid inlet 7 is arranged at the top of the motor rotor 3 , and the liquid inlet 7 is arranged to rotate and penetrate the top of the motor stator 2 . The liquid outlet 8 is arranged at the bottom of the motor rotor 3 . A transmission shaft 33 is arranged at the bottom end of the motor rotor 3 , and the transmission shaft 33 is connected to the universal shaft 34 .

[0037] The screw motor is driven by liquid pressure. When the driving liquid enters the motor, it enters the motor rotor 3 from the liquid inlet 7, and acts on the turbine structure therein, so that the motor rotor 3 rotates in the motor stator 2, generating torque acting on the transmission shaft 33, and finally driving the drill to work through the universal joint 34. The motor rotor 3 is set to a hollow structure. On the one hand, the turbine structure is set therein, and on the other hand, its inertia can be reduced by reducing its weight, thereby reducing the difficulty of starting the motor.

[0038] The bypass valve structure includes a bypass valve body 9, a valve sleeve 11 is arranged in the bypass valve body 9, a conical valve core 12 is slidably mounted above the valve sleeve 11, and a spring 13 is fixedly connected between the valve core 12 and the valve sleeve 11. An upper joint 10 is mounted on the top of the bypass valve body 9, a bypass hole 15 is arranged on the side wall of the bypass valve body 9, a connecting pipe 14 is mounted on the bottom end of the valve core 12, and the connecting pipe 14 is inserted into the liquid inlet 7.

[0039] The present invention sets a bypass valve structure at the top of the motor, and the driving liquid enters the motor rotor 3 after passing through the bypass valve structure. When the motor is started, the driving liquid first enters the valve core 12 from the upper joint 10. Due to the conical structure of the valve core 12, the pressure of the liquid can push the valve core 12 downward to overcome the elastic force of the spring 13, and the bypass hole 15 is closed by the valve core 12, forming a closed chamber in the motor, so that the liquid entering the motor rotor 3 from the liquid inlet 7 has enough pressure to drive the motor rotor 3 to rotate, and when the motor is closed, the bypass hole 15 is in an open state, so that the drilling tool and the annulus are connected.

[0040] The pushing structure includes a friction wheel 17 rotatably arranged on the motor stator 2, and also includes a spring guide rod 18 fixedly installed on the motor stator 2, a slide seat 19 movably installed on the spring guide rod 18, a friction push rod 20 is arranged on the slide seat 19, and the friction wheel 17 is connected between the outer wall of the liquid inlet 7 and the friction push rod 20. A force rod 21 is arranged on the slide seat 19, an external connecting rod 22 is arranged on the outer wall of the connecting tube 14, and an inclined guide groove 23 is arranged on the external connecting rod 22. The force rod 21 is in the inclined guide groove 23, and the connecting tube 14 can drive the slide seat 19 to move when it moves downward.

[0041] The present invention can also use the downward movement of the valve core 12. When the motor rotor 3 is initially stationary, a certain initial rotational force can be applied to the motor rotor 3 using a pushing structure, so that it can overcome inertia and have a certain initial velocity. After the liquid enters the motor rotor 3, it can rotate faster, thereby improving the response speed of the motor.

[0042] When the valve core 12 drives the connecting pipe 14 to move downward, the inclined guide groove 23 installed on the connecting pipe 14 can move downward accordingly, and the inclined pressure generated by the inner wall of the inclined guide groove 23 pushes the force-bearing rod 21 and even the slide 19. Since the slide 19 is horizontally guided by the spring guide rod 18, the slide 19 moves horizontally, and the friction push rod 20 thereon can drive the friction wheel 17 to rotate, and then the friction wheel 17 drives the liquid inlet 7 and the motor rotor 3 to overcome the static inertia and start to rotate.

[0043] The movable turbine 24 is arranged below the fixed turbine 16 , the ferromagnetic plug rod 25 is arranged in an annular manner below the movable turbine 24 , the bottom bracket 26 is located below the movable turbine 24 , a through hole is arranged in the middle of the bottom bracket 26 , and the plug hole 27 is arranged in an annular manner on the outer ring of the bottom bracket 26 .

[0044] The present invention uses the turbine structure in the motor rotor 3 to withstand the pressure of the driving liquid, so that the motor rotor 3 can rotate in the motor stator 2. The turbine structure is composed of a fixed turbine 16 and a movable turbine 24. When both turbines are used, if the pressure of the driving liquid is increased, the motor rotor 3 can rotate at a higher speed, thereby achieving the effect of increasing the upper limit of the motor power. If the motor only needs to rotate at a low speed, in order to ensure that the drive can be completed with a low flow rate of liquid, only the fixed turbine 16 can be used, and the movable turbine 24 can be adjusted to a failed state to reduce its impact on the liquid pressure.

[0045] The magnetic control structure includes a control ring 28 sleeved on the stator housing 1, a magnetic block 29 is arranged on the control ring 28, a lower fixing member 31 and an upper fixing member 32 are arranged on the stator housing 1, and a positioning screw 30 is installed on the control ring 28. The control ring 28 is provided with symmetrically arranged upward and downward positioning screws 30, the lower fixing member 31 and the upper fixing member 32 are both arranged in through grooves, and the positioning screw 30 is fixed to the lower fixing member 31 and the upper fixing member 32 by nuts.

[0046] When the movable turbine 24 falls on the base 26, the ferromagnetic rod 25 thereon enters the through hole, and the movable turbine 24, the base 26 and the motor rotor 3 form an integrated structure, the liquid pressure can be converted by the movable turbine 24 to form a rotational force acting on the motor rotor 3. At this time, the movable turbine 24 is in use. On the contrary, when the movable turbine 24 is separated from the base 26, the state of the movable turbine 24 does not affect the base 26, and it is in a non-use state. The resistance to its rotation is also small, which will not have much impact on the low-speed requirement of the motor rotor 3.

[0047] Whether the active turbine 24 is used or not is controlled by a magnetic control structure. When the control circle 28 is fixed to the lower fixing member 31 by the positioning screw 30, the active turbine 24 is driven downward by the magnetic force. Under the impact of the driving liquid, the active turbine 24 will eventually be fully connected to the base 26 to be in use. When the control circle 28 is adjusted to a high position and fixed to the upper fixing member 32 by the positioning screw 30, the magnetic force it generates will act on the active turbine 24 to suspend it. Even under the pressure of the liquid, it will not completely fall on the base 26. It is in an active non-use state in the motor rotor 3 and is subject to very little rotational resistance, which will not affect the rotation of the motor rotor 3.

[0048] When the present invention is in use: First, the all-metal screw motor provided by the present invention takes the motor stator 2 and the motor rotor 3 as the core, has the characteristics of long life and high temperature resistance, can be used to drill special process wells, such as high-temperature wells, geothermal wells, multi-branch wells, etc., and can adapt to the use of wells with complex well conditions. The motor stator 2 and the motor rotor 3 adopt circular motion, and there is no spiral surface inside the motor stator 2 and outside the motor rotor 3, which greatly improves the sealing performance of the motor. The motor stator 2 and the motor rotor 3 are respectively provided with inner grooves 4 and outer grooves 5 that cooperate with each other, and are connected by a core shaft 6 to ensure that the motor rotor 3 can rotate concentrically in the motor stator 2. The screw motor is driven by liquid pressure. When the driving liquid enters the motor, it enters from the liquid inlet 7. The motor rotor 3 is inserted into the interior of the motor rotor 3, and acts on the turbine structure therein, so that the motor rotor 3 rotates in the motor stator 2, generates torque acting on the transmission shaft 33, and finally drives the drill to work through the universal shaft 34. The motor rotor 3 is set as a hollow structure. On the one hand, the turbine structure is set therein, and on the other hand, its inertia can be reduced by reducing the weight, so that the difficulty of starting the motor is reduced. The present invention sets a bypass valve structure at the top of the motor, and the driving liquid enters the motor rotor 3 after passing through the bypass valve structure. When the motor is started, the driving liquid first enters the valve core 12 from the upper joint 10. Due to the conical structure of the valve core 12, the pressure of the liquid can push the valve core 12 downward to overcome the elastic force of the spring 13, and the valve core 12 is used to push the valve core 12 downward. The bypass hole 15 is closed, forming a closed chamber in the motor, so that the liquid entering the motor rotor 3 from the liquid inlet 7 has enough pressure to drive the motor rotor 3 to rotate. When the motor is closed, the bypass hole 15 is in an open state, so that the drilling tool and the annulus are connected. The present invention can also use the downward movement of the valve core 12. When the motor rotor 3 is initially stationary, a certain initial rotational force is applied to the motor rotor 3 using a pushing structure, so that it can overcome inertia and have a certain initial velocity. After the liquid enters the motor rotor 3, it can be rotated faster, thereby improving the response speed of the motor. When the valve core 12 drives the connecting pipe 14 to move downward, the inclined guide groove 23 installed on the connecting pipe 14 can move downward accordingly, and the inclined pressure generated by the inner wall of the inclined guide groove 23 is applied to the motor rotor 3. The force rod 21 and even the slide 19 are pushed. Since the slide 19 is horizontally guided by the spring guide rod 18, the slide 19 moves horizontally, and the friction push rod 20 thereon can drive the friction wheel 17 to rotate, and then the friction wheel 17 drives the liquid inlet 7 and the motor rotor 3 to overcome the static inertia and start to rotate. The present invention uses the turbine structure in the motor rotor 3 to withstand the pressure of the driving liquid, so that the motor rotor 3 can rotate in the motor stator 2. The turbine structure is composed of a fixed turbine 16 and a movable turbine 24. When both turbines are used, if the pressure of the driving liquid is increased, the motor rotor 3 can rotate at a higher speed, thereby achieving the effect of increasing the upper limit of the motor power. If the motor only needs to rotate at a low speed,In order to ensure that the driving can be completed by the liquid with a low flow rate, only the fixed turbine 16 can be used, and the movable turbine 24 can be adjusted to a failure state to reduce its influence on the liquid pressure. When the movable turbine 24 falls on the base 26, the ferromagnetic plug rod 25 thereon enters the through hole, and the movable turbine 24, the base 26, and the motor rotor 3 form an integrated structure, the liquid pressure can be converted by the movable turbine 24 to form a rotational force acting on the motor rotor 3. At this time, the movable turbine 24 is in use. On the contrary, when the movable turbine 24 is separated from the base 26, the state of the movable turbine 24 does not affect the base 26, and it is in a non-use state. The resistance to its rotation is also small, which will not have much impact on the low-speed demand of the motor rotor 3. Whether the active turbine 24 is used or not is controlled by a magnetic control structure. When the control ring 28 is fixed to the lower fixing member 31 through the positioning screw 30, it drives the active turbine 24 downward through the magnetic force. Under the impact of the driving liquid, the active turbine 24 will eventually be fully connected to the bottom bracket 26, making it in use. When the control ring 28 is adjusted to a high position and fixed to the upper fixing member 32 through the positioning screw 30, the magnetic force it generates will act on the active turbine 24, making it suspended. Even under the pressure of the liquid, it will not completely fall on the bottom bracket 26, and it is in an active non-use state in the motor rotor 3. The rotation resistance it encounters is very small, and it will not affect the rotation of the motor rotor 3.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An all-metal screw motor, comprising a stator housing (1), a motor stator (2) and a motor rotor (3), characterized in that: The motor stator (2) is fixedly mounted in the stator housing (1), and the motor rotor (3) is rotatably mounted in the motor stator (2); the motor rotor (3) is of a hollow structure, and a liquid inlet (7) is fixedly connected to the motor rotor (3), and a liquid outlet (8) is provided on the motor rotor (3); a bypass valve structure is provided at the top of the stator housing (1), and a connecting pipe (14) is fixedly mounted on a valve core (12) of the bypass valve structure, and the connecting pipe (14) is connected to the liquid inlet (7); an upper joint (10) is provided on the bypass valve structure; a fixed turbine (16) is provided in the cavity of the motor rotor (3); a propulsion structure is provided on the motor stator (2), and a propulsion structure is provided on the motor stator (2); The structure is connected to the liquid inlet (7). When the screw motor is started, the driving liquid can cause the bypass valve structure to close the bypass hole (15) thereon, and drive the driving structure through the bypass valve structure, so that the driving structure drives the liquid inlet (7) and the motor rotor (3) to rotate. A movable turbine (24) is arranged in the cavity of the motor rotor (3), and a ferromagnetic plug rod (25) is arranged at the bottom of the movable turbine (24). A base (26) is fixedly arranged in the cavity of the motor rotor (3), and a plug hole (27) is arranged on the base (26). A magnetic control structure is movably arranged on the stator housing (1), and the magnetic control structure can be fixed in a high position or a low position to control the position of the movable turbine (24).

2. The all-metal screw motor according to claim 1, characterized in that: The motor stator (2) adopts a seamless tube structure, and the stator shell (1) is sleeved on the outside of the motor stator (2). The motor stator (2) is provided with an inner groove (4), and the motor rotor (3) is provided with an outer groove (5). A core shaft (6) is provided in the inner groove (4) and the outer groove (5).

3. The all-metal screw motor according to claim 1, characterized in that: The liquid inlet (7) is arranged at the top of the motor rotor (3), and the liquid inlet (7) is arranged to rotate and penetrate the top of the motor stator (2). The liquid outlet (8) is arranged at the bottom of the motor rotor (3). A transmission shaft (33) is arranged at the bottom end of the motor rotor (3), and the transmission shaft (33) is connected to the universal shaft (34).

4. The all-metal screw motor according to claim 1, characterized in that: The bypass valve structure comprises a bypass valve body (9), wherein a valve sleeve (11) is arranged in the bypass valve body (9), a conical valve core (12) is slidably mounted above the valve sleeve (11), and a spring (13) is fixedly connected between the valve core (12) and the valve sleeve (11).

5. The all-metal screw motor according to claim 4, characterized in that: The upper joint (10) is installed on the top of the bypass valve body (9), and the bypass hole (15) is arranged on the side wall of the bypass valve body (9). The connecting pipe (14) is installed on the bottom end of the valve core (12), and the connecting pipe (14) is inserted into the liquid inlet (7).

6. The all-metal screw motor according to claim 1, characterized in that: The pushing structure comprises a friction wheel (17) rotatably mounted on the motor stator (2), and also comprises a spring guide rod (18) fixedly mounted on the motor stator (2), a slide seat (19) being movably mounted on the spring guide rod (18), and a friction push rod (20) being arranged on the slide seat (19), and the friction wheel (17) is connected between the outer wall of the liquid inlet (7) and the friction push rod (20).

7. The all-metal screw motor according to claim 6, characterized in that: The slide seat (19) is provided with a force-bearing rod (21), and the outer wall of the connecting tube (14) is provided with an external connecting rod (22), an inclined guide groove (23) is provided on the external connecting rod (22), and the force-bearing rod (21) is located in the inclined guide groove (23), so that the slide seat (19) can be driven to move when the connecting tube (14) moves downward.

8. The all-metal screw motor according to claim 1, characterized in that: The movable turbine (24) is arranged below the fixed turbine (16), and the ferromagnetic plug rod (25) is arranged in an annular shape below the movable turbine (24). The base (26) is located below the movable turbine (24), and a through hole is arranged in the middle of the base (26), and the plug hole (27) is arranged in an annular shape on the outer ring of the base (26).

9. The all-metal screw motor according to claim 1, characterized in that: The magnetic control structure comprises a control ring (28) sleeved on a stator housing (1), and a magnetic block (29) is arranged on the control ring (28); a lower fixing part (31) and an upper fixing part (32) are arranged on the stator housing (1), and a positioning screw (30) is installed on the control ring (28).

10. The all-metal screw motor according to claim 9, characterized in that: The control ring (28) is provided with symmetrically arranged upward and downward positioning screws (30), and the lower fixing member (31) and the upper fixing member (32) are both provided with through grooves, and the positioning screws (30) are fixed to the lower fixing member (31) and the upper fixing member (32) by nuts.

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