Motor speed-up tool with overload protection

Abstract

The application provides a motor speed-up tool with an overload protection device, which comprises a transmission shaft and a motor assembly, one end of the transmission shaft is provided with the motor assembly, the motor assembly is provided with a two-way valve assembly away from one end of the transmission shaft, an overload protection device is arranged between the two-way valve assembly and the motor assembly, the overload protection device comprises an intermediate shell assembly, a flow guide rod is arranged in the intermediate shell assembly, a moving valve is arranged in the motor assembly, and one end of the moving valve is fixedly connected with the flow guide rod; the overload protection device composed of the flow guide rod, an adjusting sleeve, the moving valve and a disc spring is arranged, so that the whole speed-up tool has an overload protection function, can be well used as a power equipment on the ground, has a simple overall structure, can well protect the tool in the well drilling speed-up, increases the tool life, and saves the economic cost.

Description

Technical Field

[0001] This application relates to the field of drilling engineering technology, and specifically to a motor speed-up tool with an overload protection device. Background Technology

[0002] Motor-driven drilling tools are currently the most widely used type of downhole power drilling tool, primarily used for directional and horizontal well drilling, including build-up and azimuth adjustment. They are also used in vertical and sidetracking operations. Utilizing the Moino principle, they convert drilling fluid pressure into mechanical energy, making them a volumetric downhole power drilling tool. The market for motor-driven drilling tools is very broad, enabling accurate sidetracking, build-up, directional drilling, and correction; they can drill directional wells, horizontal wells, branch wells, and cluster wells, significantly improving the economic efficiency of drilling. Currently, with the application of MWD, PDC drill bits, and high-efficiency directional screw drills, directional drilling technology has been greatly improved, leading to increasingly sophisticated directional drilling systems. In recent years, motor-driven drilling tools have developed rapidly and their market share is increasing daily.

[0003] In conceiving and formulating this application, the applicant discovered that existing wind-driven motor speed-up mechanisms on the market have a stator with forward and reverse rotation channels, a rotor inside the cavity, and a front and rear cover tightly pressed on the left and right sides of the stator. One side of the rear cover has a forward and reverse air inlet, which connect to the forward and reverse rotation channels on the stator. The forward and reverse rotation channels lead from both sides of the rotor into the cavity. Each of the forward and reverse rotation channels has a one-way valve at its inlet, controlled by a valve ball. This device changes the original one-way entry to two-way entry, placing the rotor in an intermediate state, reducing the frictional resistance between the two end faces of the rotor during rotation, maximizing the rotational speed, and improving the rotor's high-speed rotation capability.

[0004] However, the aforementioned devices and existing technologies still have the following problems during implementation: With the exploration and development of deep wells, ultra-deep wells, and geothermal wells, as well as the increasingly stringent requirements for screw drills in coiled tubing operations, the performance requirements for screw motors are becoming increasingly demanding, requiring large displacement and high torque. During drilling, increased drilling pressure leads to increased motor torque to overcome resistance torque, but simultaneously causes a corresponding decrease in rotational speed. When the motor pressure differential gradually increases to a critical value, the drill bit speed reaches zero, resulting in braking, at which point the torque reaches its maximum. When braking occurs, all the drilling fluid entering the motor leaks out through the gaps in the deformed stator rubber bushing. The braking condition subjectes the tool's rotor, universal joint, and drive shaft to maximum torque, posing a significant risk to the tool and greatly increasing the possibility of fish falling into the ground. Furthermore, the motor's speed-up and stabilization structure is generally complex, increasing the overall production cost of the device. Summary of the Invention

[0005] The purpose of this application is to provide a motor speed-up tool with an overload protection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A motor speed-up tool with overload protection includes a drive shaft and a motor assembly. The motor assembly is located at one end of the drive shaft, and a two-way valve assembly is located at the end of the motor assembly away from the drive shaft.

[0008] An overload protection device is provided between the bidirectional valve assembly and the motor assembly. The overload protection device includes an intermediate housing assembly, a flow guide rod is provided inside the intermediate housing assembly, and a moving valve is provided inside the motor assembly. The moving valve and one end of the flow guide rod are fixedly connected.

[0009] Preferably, the motor assembly includes a stator and a rotor. The stator is formed by pressing a rubber sleeve onto the inner wall of a steel pipe. The inner hole of the rubber sleeve is configured as a helical curved surface. The rotor is configured as a multi-start screw.

[0010] Preferably, the moving valve is disposed inside the rotor, an adjusting sleeve is provided at the end of the moving valve near the guide rod, a sealing ring is provided between the moving valve and the rotor, and a disc spring is provided between the end of the moving valve away from the guide rod and the rotor.

[0011] Preferably, the bidirectional valve assembly includes a valve body, a valve core is hollowly disposed within the valve body, a valve sleeve is connected to one side of the valve core, a spring is disposed between the valve core and the valve sleeve, a sealing element is disposed between the valve core and the valve sleeve and the inner wall of the valve body, and a retaining ring for a hole is disposed within the valve body on one side of the valve core.

[0012] Preferably, the valve body has a through hole in its side wall, and a sieve plate is provided at the top of the through hole.

[0013] Preferably, the intermediate housing assembly includes an anti-drop connector and an anti-drop linkage disposed within the anti-drop connector, with one end of the anti-drop linkage fixedly installed within the anti-drop connector by an anti-drop nut.

[0014] Preferably, a universal joint assembly is provided at the end of the motor assembly away from the guide rod. The universal joint assembly includes a housing and a universal joint, with the universal joint being disposed through the housing.

[0015] Preferably, the motor speed-up tool includes a drive shaft housing, one end of which passes through the drive shaft housing, and a water cap is fixedly connected to the end of the drive shaft near the universal joint assembly to form a drive shaft assembly.

[0016] Preferably, an upper TC moving ring is fitted on the outer surface of one end of the drive shaft, and an upper TC stationary ring is provided between the upper TC moving ring and the inner wall of the drive shaft housing. A lower TC moving ring is fitted on the outer surface of the other end of the drive shaft, and a lower TC stationary ring is provided between the lower TC moving ring and the inner wall of the drive shaft housing.

[0017] Preferably, the lower TC stationary ring is fitted with a lower locking sleeve on one side inside the drive shaft housing, a shaft washer is provided between the lower locking sleeve and the inner wall of the drive shaft housing, and a thrust bearing assembly is installed between the lower locking sleeve and the upper TC moving ring on the surface of the drive shaft.

[0018] In summary, this application, by sequentially assembling a bidirectional valve assembly, an intermediate housing assembly, a motor assembly, a universal joint assembly, and a drive shaft assembly, with the drive shaft passing through the drive shaft housing and connected to an overload protection device via the universal joint, presents a simple overall structure. During drilling speed-up, it effectively protects the tool from downhole accidents caused by overload, saving economic costs. Furthermore, by incorporating an overload protection device consisting of a guide rod and a moving valve, this application provides overload protection for the entire speed-up tool, enabling it to function effectively as a power source on the surface. This ensures the motor-driven speed-up tool is always in optimal working condition, increasing its service life and significantly reducing drilling costs.

[0019] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This shows a schematic diagram of the front sectional view of the present application rotated 90°;

[0022] Figure 2 A cross-sectional structural schematic diagram of the overload protection device of this application is shown;

[0023] Figure 3 A cross-sectional view of the intermediate housing assembly of this application is shown;

[0024] Figure 4 This paper shows a schematic diagram of the release principle of the intermediate housing assembly of this application;

[0025] Figure 5 A schematic diagram of the mud flow direction of this application is shown;

[0026] Figure 6 A cross-sectional view of the bidirectional valve assembly of this application is shown;

[0027] Figure 7 This shows a schematic diagram of the cross-sectional structure of the drive shaft assembly of this application rotated 90°;

[0028] Figure 8 This application shows Figure 7 Enlarged structural diagram of section A.

[0029] In the diagram: 1. Two-way valve assembly; 101. Valve body; 102. Valve core; 103. Valve sleeve; 104. Spring; 105. Seal; 106. Retaining ring for the bore; 107. Through hole; 108. Screen plate; 2. Intermediate housing assembly; 201. Anti-drop connector; 202. Anti-drop connecting rod; 203. Anti-drop nut; 3. Motor assembly; 301. Stator; 302. Rotor; 4. Universal joint assembly; 401. 402. Housing; 5. Universal joint; 6. Drive shaft assembly; 7. Drive shaft housing; 8. Water cap; 9. Drive shaft; 10. Upper TC moving ring; 11. Upper TC stationary ring; 12. Lower TC moving ring; 13. Lower TC stationary ring; 14. Lower locking sleeve; 15. Shaft pad; 26. Thrust bearing assembly; 17. Drainage rod; 18. Adjusting sleeve; 19. Dynamic valve; 10. Sealing ring; 11. Disc spring. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Specifically, this application provides a motor speed-up tool with an overload protection device. Figure 1 A schematic diagram of the front sectional view of this application rotated 90° is shown.

[0032] Please see Figure 1 The motor speed-up tool specifically includes a drive shaft 6 and a motor assembly 3.

[0033] Among them, a motor assembly 3 is provided at one end of the drive shaft 6, and a two-way valve assembly 1 is provided at the end of the motor assembly 3 away from the drive shaft 6.

[0034] Figure 2A cross-sectional structural schematic diagram of the overload protection device of this application is shown.

[0035] Please also refer to Figure 1 and Figure 2 An overload protection device is provided between the two-way valve assembly 1 and the motor assembly 3.

[0036] Optionally, the overload protection device includes an intermediate housing assembly 2, a diversion rod 7 is provided inside the intermediate housing assembly 2, and a moving valve 9 is provided inside the motor assembly 3. The moving valve 9 and one end of the diversion rod 7 are fixedly connected.

[0037] During drilling, the friction between the drill bit and the corresponding wellbore is a crucial factor affecting the drilling speed, especially in horizontal and highly deviated wells. Due to gravity, a large portion of the drill string's weight is used to overcome friction with the wellbore, resulting in a low mechanical drilling speed and slow drilling progress, severely impacting the well construction schedule. Optionally, the two-way valve assembly 1 has two positions: bypass and closed. For example, the fixing plate fixedly connected to the inner wall of the drill sleeve can have multiple sets of fluid passage holes. Understandably, when the mud flow rate and pressure reach a certain value (i.e., when the pump is started), the valve core moves downward, closing the bypass valve's bypass hole. At this time, the mud flows through the motor to perform work. For example, as the drilling mud passes through the drill sleeve, it drives the motor's helical rotor to rotate. The higher the flow rate, the faster the rotation speed, thereby increasing the drill bit's drilling speed and improving work efficiency.

[0038] On the other hand, the overload protection device, through the installation of a movable valve 9, allows the mud flowing through the motor to accumulate pressure at the top of the motor when the drive shaft is overloaded. As the pressure increases, when it reaches the predetermined pressure of the overload protection device, the mud pushes the movable valve 9 through the guide rod 7, causing the valve 9 to move downwards. The mud accumulated at the top of the motor can then flow into the annulus of the movable valve 9 through the hole in the motor screw. The annulus of the movable valve 9 has holes through which the mud flows into the inner hole of the motor screw, thus relieving pressure and providing overload protection. For example, during tripping operations, a spring can lift the valve core, placing the bypass valve in the bypass position. This allows the mud in the drill string to enter the annular space between the wellbore and the drill string, preventing mud from overflowing onto the drill platform during tripping operations.

[0039] Optionally, the motor assembly 3 includes a stator 301 and a rotor 302.

[0040] For example, the stator 301 may be formed by pressing a rubber sleeve onto the inner wall of a steel pipe, and the inner hole of the rubber sleeve is set as a helical surface with certain geometric parameters.

[0041] Optionally, the stator 301 consists of two semi-cylindrical high-strength alloy steel anti-wear body pieces, with two semi-cylindrical rubber sleeves embedded inside. Rubber bushing ribs can be provided on the outer side of the rubber sleeves, their positions corresponding to the internal grooves of the anti-wear body, thus increasing stability. The helical surface can be considered as a line segment sweeping across the surface as it spirals upwards at a constant speed along a straight line perpendicular to its midpoint. It can be seen as a three-dimensional version of a helix, the third known minimal surface after the planar and catenary surfaces. Through the stator 301 body, composed of an external high-strength alloy steel body and internal rubber bushings, during drilling operations, the rubber bushings act as a "sacrifice" at the contact point with the rotating rod, thus converting the high-friction relative rotation between the rotating rod joint and the casing inner wall into a smooth relative rotation between the rotating rod and the rubber bushings. This effectively protects the casing and plays a positive role in preventing wear and reducing torque. Meanwhile, depending on the actual drilling conditions, drill string assembly, and downhole environment, a high-strength alloy body and an internal rubber bushing with appropriate material properties can be selected for the wear-resistant device. The rubber bushing is replaceable, which extends the service life of the wear-resistant device and reduces drilling costs.

[0042] For example, the rotor 302 may be a plated multi-start screw. The rotor 302 may mesh with the stator 301, forming a helical sealing line using the lead difference between the two, thus forming a sealing cavity.

[0043] Threads can be classified not only by cross-sectional shape but also by the number of helical grooves. Threads with two or more helical grooves are called multi-start screws. The distance between two adjacent helical grooves on the thread is called the pitch. The distance advanced in one revolution along the helical groove is called the lead. Multi-start screws are also called multi-start lead screws, multi-start threaded rods, or multi-start lead screws. A spiral seal is a radial non-contact rotating shaft sealing device that utilizes fluid dynamic pressure for backflow. A non-contact dynamic seal that uses threads to prevent liquid leakage is also called a threaded seal. Typically, threads are machined on the rotating shaft at the sealing location. During operation, leaked liquid fills the space enclosed by the threads and the housing, forming a "liquid nut." The direction of the threads on the shaft causes the "liquid nut" to move axially when the shaft rotates, prompting the liquid to continuously return to the high-pressure end. Spiral seals are suitable for applications with high liquid viscosity, small pressure differentials, and medium rotational speeds. They are largely unaffected by liquid temperature. Spiral seals are divided into two main categories: ordinary spiral seals and spiral labyrinth seals. Ordinary spiral seals have spiral grooves machined into the surface of either the shaft or the hole at the sealing location. Spiral labyrinth seals have spiral grooves machined into the surfaces of both the shaft and the hole at the sealing location, with opposite spiral directions. Ordinary spiral seals are often simply referred to as spiral seals. Spiral labyrinth seals are also known as "composite spiral seals." In essence, drilling fluid enters the motor and drives the rotor 302 to rotate within the stator 301. As the rotor 302 rotates within the stator 301, the sealing cavity moves axially, continuously forming and disappearing, completing its energy conversion. At this time, the motor speed-up tool can convert the pressure energy of the liquid into mechanical energy. The principle is that the input to the screw motor is a liquid with a certain pressure; the screw motor consumes the pressure of the liquid (pressure energy) and outputs torque and speed (mechanical energy).

[0044] Figure 3 A cross-sectional view of the intermediate housing assembly of this application is shown; Figure 4 A schematic diagram of the release principle of the intermediate housing assembly of this application is shown.

[0045] Please also refer to Figure 3 and Figure 4 In one embodiment, the moving valve 9 is disposed inside the rotor 302; an adjusting sleeve 8 is disposed at one end of the moving valve 9 near the guide rod 7, and a sealing ring 10 is disposed between the moving valve 9 and the rotor 302.

[0046] Optionally, a disc spring 11 is provided between the end of the actuator 9 away from the flow rod 7 and the rotor 302.

[0047] Disc springs, also known as Belleville spring washers, are conical discs that can be used individually, in series, or in parallel. They withstand axial static or dynamic loads at their upper inner and lower outer edges, deforming upon compression until flattened, storing energy as a live load. When necessary, they automatically convert into the additional compressive load required for sealing, reducing the continuous tightening requirements of gaskets and packings. Disc springs can provide sufficient elastic extension through a considerable number of stacked springs, thus fulfilling their function. In this embodiment, drilling mud flows through the inner bore into the motor assembly 3, where the motor provides hydraulic power, which is then transmitted to the drill bit via the drive shaft 6, thereby enabling rock breaking and drilling.

[0048] Figure 5 A schematic diagram of the mud flow direction of this application is shown.

[0049] Please refer to Figure 5 Understandably, when the drive shaft is overloaded, the slurry flowing through the motor accumulates pressure at the top of the motor, causing the pressure to continuously increase. When the predetermined pressure of the overload protection device is reached, the slurry passes through the guide rod 7, pushing the moving valve 9 to compress the disc spring 11. This causes the moving valve 9 to move downwards, allowing the slurry accumulated at the top of the motor to flow into the annulus of the moving valve 9 through the hole on the motor screw. The annulus of the moving valve 9 has a hole, through which the slurry can flow into the inner hole of the motor screw, thus relieving pressure and providing overload protection.

[0050] Figure 6 A cross-sectional structural schematic diagram of the bidirectional valve assembly of this application is shown.

[0051] Please see Figure 6 Optionally, the two-way valve assembly 1 includes a valve body 101, and a valve core 102 may be provided in the hollow position inside the valve body 101.

[0052] Optionally, a valve sleeve 103 is connected to one side of the valve core 102, and a spring 104 can be provided between the valve core 102 and the valve sleeve 103. Sealing elements 105 can be provided between the valve core 102 and the valve sleeve 103 and the inner wall of the valve body 101, respectively. A retaining ring 106 for the hole can be provided inside the valve body 101 on one side of the valve core 102. Optionally, a through hole 107 is provided through the side wall of the valve body 101, and a sieve plate 108 can be provided at the top of the through hole 107.

[0053] Please see Figure 4 For example, the intermediate housing assembly 2 includes a fall arrestor 201 and a fall arrestor linkage 202 disposed within the fall arrestor 201.

[0054] Optionally, one end of the anti-drop connecting rod 202 is fixedly installed inside the anti-drop joint 201 by an anti-drop nut 203. Understandably, if the housing of the screw drill below the anti-drop assembly breaks or disengages due to abnormal reasons, the anti-drop nut 203 can be fixed on the inner step of the anti-drop joint 201 to pull out the lower part of the rotor, so as to prevent objects from falling downhole.

[0055] Please refer to it again. Figure 1 Optionally, a universal joint assembly 4 may be provided at the end of the motor assembly 3 away from the guide rod 7.

[0056] Optionally, the universal joint assembly 4 may include a housing 401 and a universal joint 402, with the universal joint 402 extending through the housing 401. The function of the universal joint is to convert the planetary motion of the motor into the fixed-axis rotation of the drive shaft, transmitting the torque and speed generated by the motor to the drive shaft and ultimately to the drill bit.

[0057] Figure 7 A schematic diagram of the cross-sectional structure of the drive shaft assembly of this application, rotated 90°, is shown.

[0058] Please see Figure 7 Optionally, the drive shaft assembly 5 includes a drive shaft housing 501.

[0059] For example, one end of the drive shaft 6 extends through the drive shaft housing 501, and a water cap 502 can be fixedly connected to the end of the drive shaft 6 near the universal joint assembly 4.

[0060] Understandably, thrust bearings are used to withstand the axial forces generated by the drill bit under various operating conditions. Radial bearing assemblies, on the other hand, are used to straighten the drive shaft to ensure its normal operating position.

[0061] Please continue reading. Figure 7 For example, an upper TC moving ring 601 may be provided on the outer surface of one end of the drive shaft 6. An upper TC stationary ring 602 may be provided between the upper TC moving ring 601 and the inner wall of the drive shaft housing 501.

[0062] Figure 8 This application shows Figure 6 Enlarged structural diagram of section A;

[0063] Please also refer to Figure 7 and Figure 8 For example, the outer surface of the other end of the drive shaft 6 may be provided with a lower TC moving ring 603. A lower TC stationary ring 604 may be provided between the lower TC moving ring 603 and the inner wall of the drive shaft housing 501.

[0064] Optionally, a lower locking sleeve 605 may be provided on one side of the lower TC stationary ring 604 located inside the drive shaft housing 501. A shaft washer 606 may be provided between the lower locking sleeve 605 and the inner wall of the drive shaft housing 501. A thrust bearing assembly 607 may be installed between the lower locking sleeve 605 and the upper TC moving ring 601 on the surface of the drive shaft 6. In this embodiment, the thrust bearing assembly 607 is provided to withstand the axial force generated by the drill bit under various working conditions, thereby improving the service life of the drill bit.

[0065] It should be noted that the universal joint 402 converts the planetary motion of the motor into the fixed-axis rotation of the drive shaft 6, transmitting the torque and speed generated by the motor to the drive shaft and ultimately to the drill bit. Optionally, the universal joint 402 can be configured as any one of three types: petal type, ball joint type, or flexible shaft (flexible shaft).

[0066] This application features a series of interconnected components: a two-way valve assembly, an intermediate housing assembly, a motor assembly, a universal joint assembly, and a drive shaft assembly. The drive shaft is housed within the drive shaft housing and connected to an overload protection device via the universal joint. The overall structure is simple and effectively protects the drilling speed-up tool from downhole accidents caused by overload, thus saving economic costs. Furthermore, the overload protection device, consisting of a guide rod and a moving valve, provides overload protection for the entire speed-up tool, enabling it to function effectively as a surface power source. This ensures the motor-driven speed-up tool is always in optimal working condition, increasing its lifespan and significantly reducing drilling costs.

[0067] It is understood that the above scenarios are merely examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of this application. The technical solutions of this application can also be applied to other scenarios. For example, as those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0068] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0069] The technical features in the embodiments of this application can be adjusted, merged, or deleted in order according to actual needs.

[0070] In this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions are generally described in detail only when they appear for the first time. When they appear again, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions that are not described in detail later can be referred to their previous relevant detailed descriptions.

[0071] In this application, the descriptions of the various embodiments have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0072] The technical features of the present application can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0073] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A motor speed-up tool with overload protection device, characterized in that, It includes a drive shaft (6) and a motor assembly (3). The motor assembly (3) is provided at one end of the drive shaft (6), and a two-way valve assembly (1) is provided at the end of the motor assembly (3) away from the drive shaft (6). An overload protection device is provided between the two-way valve assembly (1) and the motor assembly (3). The overload protection device includes an intermediate housing assembly (2), and a flow guide rod (7) is provided inside the intermediate housing assembly (2). The motor assembly (3) is provided with a moving valve (9), and the moving valve (9) is fixedly connected to one end of the diversion rod (7); the motor assembly (3) includes a stator (301) and a rotor (302), the stator (301) is formed by pressing a rubber sleeve on the inner wall of a steel pipe, the inner hole of the rubber sleeve is set as a helical curved surface, and the rotor (302) is set as a multi-head screw; The moving valve (9) is disposed inside the rotor (302). An adjusting sleeve (8) is provided at the end of the moving valve (9) near the guide rod (7), and a sealing ring (10) is provided between the moving valve (9) and the rotor (302). A disc spring (11) is provided between the end of the moving valve (9) away from the guide rod (7) and the rotor (302). A universal joint assembly (4) is provided at the end of the motor assembly (3) away from the guide rod (7). The universal joint assembly (4) includes a housing (401) and a universal joint (402). The universal joint (402) is disposed through the housing (401).

2. The motor speed-up tool with overload protection device according to claim 1, characterized in that, The bidirectional valve assembly (1) includes a valve body (101), a valve core (102) is provided in a hollow position inside the valve body (101), a valve sleeve (103) is provided on one side of the valve core (102), a spring (104) is provided between the valve core (102) and the valve sleeve (103), a sealing element (105) is provided between the valve core (102) and the valve sleeve (103) and the inner wall of the valve body (101), and a retaining ring (106) for the hole is provided inside the valve body (101) on one side of the valve core (102).

3. The motor speed-up tool with overload protection device according to claim 2, characterized in that, The valve body (101) has a through hole (107) through the side wall, and a sieve plate (108) is provided on the top of the through hole (107).

4. The motor speed-up tool with overload protection device according to claim 1, characterized in that, The intermediate housing assembly (2) includes an anti-drop connector (201) and an anti-drop link (202) disposed in the anti-drop connector (201). One end of the anti-drop link (202) is fixedly installed in the anti-drop connector (201) by an anti-drop nut (203).

5. The motor speed-up tool with overload protection device according to any one of claims 1-4, characterized in that, It also includes a drive shaft housing (501), one end of the drive shaft (6) passes through the drive shaft housing (501), and a water cap (502) is fixedly connected to the end of the drive shaft (6) near the universal joint assembly (4).

6. The motor speed-up tool with overload protection device according to claim 5, characterized in that, An upper TC moving ring (601) is fitted on the outer surface of one end of the drive shaft (6), and an upper TC stationary ring (602) is provided between the upper TC moving ring (601) and the inner wall of the drive shaft housing (501). A lower TC moving ring (603) is fitted on the outer surface of the other end of the drive shaft (6), and a lower TC stationary ring (604) is provided between the lower TC moving ring (603) and the inner wall of the drive shaft housing (501).

7. The motor speed-up tool with overload protection device according to claim 6, characterized in that, The lower TC stationary ring (604) is fitted with a lower locking sleeve (605) on one side inside the transmission shaft housing (501). A shaft washer (606) is provided between the lower locking sleeve (605) and the inner wall of the transmission shaft housing (501). A thrust bearing assembly (607) is installed between the lower locking sleeve (605) and the upper TC moving ring (601) on the surface of the transmission shaft (6).

Images