Assembly type anti-falling regeneration screw drill

Abstract

The invention provides an assembly type anti-falling regeneration screw drill, and belongs to the field of drilling equipment. According to the assembly type anti-falling regeneration screw drilling tool, the overall assembly structure of the screw drilling tool is redesigned, and the screw motor, the bypass valve and the universal shaft are installed in the main barrel shell, so that disassembly difficulty caused by corrosion due to taper thread connection is avoided; the arrangement of the internal screw motor, the bypass valve and the universal shaft is not limited by taper thread connection of the shell any more, the axial length and position of each part can be freely designed, the bypass valve and the universal shaft can be designed more compactly, a larger space is reserved, the length of the screw motor is increased, and the efficiency is improved; the screw motor is positioned and sealed in the main barrel shell through the inner conical surface of the positioning ring, the bypass valve and the screw motor are positioned and sealed through the outer conical surface of the liquid inlet end of the stator shell, positioning and sealed connection are achieved at the same time, disassembly and assembly are more convenient, and recycling and regeneration of the screw drill are facilitated.

Description

Technical Field

[0001] The present application belongs to the technical field of drilling equipment, and more specifically, relates to an assembled anti-slip regeneration screw drilling tool. Background Art

[0002] Screw drilling tools are a type of volumetric downhole power drilling tools that use drilling fluid as a driving force to convert liquid pressure energy into mechanical energy. They are mainly composed of four major assemblies: bypass valve, screw motor, universal shaft and transmission shaft. After long-term use, various parts of screw drilling tools will experience varying degrees of wear and tear, eventually leading to product scrapping. These scrapped products will be shipped back to the factory for remanufacturing. By processing each part, the product will restore its performance and be put back into use.

[0003] The screw drill is mainly composed of four major assemblies, namely the bypass valve, screw motor, universal shaft and transmission shaft. The four assemblies are assembled separately and then connected together in turn through tapered threads. This structure is conducive to production and processing, and has been widely used. However, this kind of split-structure screw drill needs to process the connection structure of each part during production, and also needs to assemble each part, which increases the process flow and the production time of a single product; and after the screw drill has been used for a period of time, the tapered thread connection between the parts is easy to rust and difficult to disassemble, which increases the difficulty of regenerating the screw drill. Therefore, a new screw drill assembly structure is urgently needed. Summary of the invention

[0004] In view of this, an embodiment of the present application provides an assembled anti-slip regeneration screw drill to solve the technical problems in the prior art that the connection method between the bypass valve, the screw motor and the universal shaft is complicated in process flow, and the tapered thread connection is prone to rust after long-term use, making it difficult to disassemble and increasing the difficulty of regenerating the screw drill.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] On the one hand, an assembled anti-slip regeneration screw drill is provided, comprising:

[0007] A main barrel shell, with two ends respectively being a first connecting end and a second connecting end; a positioning ring is provided on the inner wall of the main barrel shell, and the positioning ring divides the inner cavity of the main barrel shell into a front cavity close to the first connecting end and a rear cavity close to the second connecting end; an end of the positioning ring facing the front cavity is provided with an inner conical surface;

[0008] A screw motor, suitable for being installed into the front section cavity from the first connecting end, comprises a stator housing and a rotor screw; the two ends of the stator housing are respectively a liquid inlet end and a liquid outlet end, and the outer peripheries of the liquid inlet end and the liquid outlet end are provided with outer conical surfaces; the rotor screw is arranged in the stator housing to form a motor structure, and one end of the rotor screw extends from the liquid outlet end to form an output end; after the screw motor is installed in the front section cavity, the outer conical surface of the liquid outlet end of the stator housing abuts against the inner conical surface of the positioning ring to form a sealing fit, and positions the output end of the screw motor;

[0009] A bypass valve is suitable for being installed into the front section cavity from the first connecting end, and the outlet end is provided with an inner conical surface, and the side surface is provided with a bypass port; after the bypass valve is installed into the front section cavity, the inner conical surface of the outlet end abuts against the outer conical surface of the liquid inlet end of the stator housing to form a sealing fit, and the bypass valve is axially positioned; the side wall of the main cylinder shell is provided with a side hole opposite to the bypass port of the bypass valve;

[0010] A universal shaft, adapted to be installed into the rear section cavity from the second connecting end, and having a first end connected to an output end of the screw motor through an inner hole of the positioning ring; and

[0011] The transmission shaft section comprises a transmission housing and a power shaft, wherein the transmission housing is connected to the second connecting end of the main cylinder shell, and the power shaft is connected to the second end of the universal shaft.

[0012] In some embodiments, the assembled anti-dropping regeneration screw drill also includes an anti-dropping structure, and the anti-dropping structure includes:

[0013] A connecting tube, one end of which is connected to the first connecting end of the main tube shell, and the other end of which is suitable for connecting to a drill rod; the connection strength between the connecting tube and the drill rod is greater than the connection strength between the connecting tube and the main tube shell;

[0014] The anti-drop disk is arranged in the connecting tube and connected to the connecting tube; the anti-drop disk is provided with a center hole and a first flow guide hole; the connecting tube is axially conducted through the first flow guide hole;

[0015] A connecting plate, adapted to be installed into the front section cavity from the first connecting end and to form a threaded connection with the inner wall of the front section cavity, and after the connecting plate is installed into the front section cavity, the bypass valve and the screw motor are pressed against the positioning ring in sequence by the screwing action of the threaded connection; the connecting plate is provided with a second guide hole; the main cylinder shell is axially conducted through the second guide hole; and

[0016] The anti-drop rod has a limiting head at one end and the other end passes through the anti-drop plate through the center hole and is connected to the connecting plate. The limiting head limits the anti-drop plate.

[0017] In certain embodiments, the bypass valve comprises:

[0018] A fixed valve core having an axial through hole at its center and one end forming an outlet of the bypass valve;

[0019] The movable valve core has an axial through hole at its center and the bypass port is provided on its side wall; the movable valve core is internally and externally coupled with the fixed valve core and is axially slidable, and the maximum coupling length of the movable valve core shaft is at least sufficient to allow the bypass port to be closed by the side wall of the fixed valve core;

[0020] a valve spring, disposed between the fixed valve core and the movable valve core, to push the fixed valve core and the movable valve core to separate axially so that the bypass port exits the fixed valve core; and

[0021] A compression sleeve, located at one end of the movable valve core away from the fixed valve core, and connected to the fixed valve core through a connecting column;

[0022] The connecting plate presses against the pressing sleeve so that the fixed valve core is pressed against the screw motor.

[0023] In some embodiments, a first shoulder ring is provided on the outer periphery of the fixed valve core, and a second shoulder ring is provided on the outer periphery of the movable valve core; the valve spring is sleeved outside the fixed valve core and the movable valve core, and two ends thereof are respectively against the first shoulder ring and the second outer shoulder ring;

[0024] The second outer shoulder ring is provided with a through hole along the axial direction, and the connecting column passes through the through hole to form a sliding fit.

[0025] In some embodiments, the minimum sleeve length between the movable valve core and the fixed valve core is less than 10 mm.

[0026] In some embodiments, a copper sleeve is provided on the outer conical surface of the liquid inlet end of the stator housing, and a copper sleeve is provided on the outer conical surface of the liquid outlet end of the stator housing; a disc spring is provided between the pressure sleeve and the connecting plate to maintain a clamping force between the bypass valve, the screw motor and the positioning ring.

[0027] In certain embodiments, the output end of the rotor screw is threadedly connected to the first end of the universal shaft, and a sealing ring is provided at the outer seam;

[0028] The side surface of the output end of the rotor screw is provided with a positioning plane, and the main cylinder shell is provided with a pre-sealed hole, and the position of the pre-sealed hole in the axial direction is radially opposite to the position of the positioning plane in the axial direction;

[0029] During operation, the pre-sealed hole is blocked by a blocking member, and during assembly and disassembly, the pre-sealed hole allows a positioning rod to be inserted, so that the positioning rod abuts against the positioning plane and limits the rotation of the output end of the rotor screw.

[0030] In some embodiments, the pre-sealed hole is a countersunk threaded hole, the blocking member is a countersunk bolt suitable for being threadedly connected to the pre-sealed hole, and the positioning rod is a long screw suitable for being threadedly connected to the pre-sealed hole.

[0031] The beneficial effect of the assembled anti-slipping regeneration screw drill provided in the embodiment of the present application is that: compared with the prior art, the assembled anti-slipping regeneration screw drill in the embodiment of the present application redesigns the overall assembly structure of the screw drill, and by installing the screw motor, bypass valve and universal shaft in the main barrel shell, the tapered thread connection exposed to the outside is reduced, and the difficulty of disassembly caused by rust is avoided;

[0032] At the same time, since the number of tapered thread connections on the screw drill housing is reduced, the settings of the internal screw motor, bypass valve and universal shaft are no longer restricted by the tapered thread connections of the housing, and the axial length and position of each part can be freely designed. The bypass valve and universal shaft can be designed to be more compact, leaving more space to increase the length of the screw motor and improve efficiency.

[0033] The screw motor is positioned and sealed in the main barrel shell by the inner cone surface of the positioning ring, and the bypass valve and the screw motor are positioned and sealed by the outer cone surface of the liquid inlet end of the stator shell, realizing positioning and sealing connection at the same time, making disassembly and assembly more convenient and facilitating the recycling of screw drilling tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 A schematic diagram of the internal structure of an assembled anti-slip regeneration screw drill provided in an embodiment of the present application;

[0036] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0037] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0038] Figure 4 for Figure 1 Schematic diagram of the internal structure of the mid-screw motor.

[0039] Among them, the reference numerals in the figure are:

[0040] 1-main cylinder shell; 11-positioning ring; 12-side hole; 13-pre-sealed hole; 14-front section cavity; 15-rear section cavity; 2-screw motor; 21-stator housing; 211-copper sleeve; 22-rotor screw; 221-sealing ring; 222-positioning plane; 3-bypass valve; 31-fixed valve core; 311-first shoulder ring; 32-movable valve core; 321-second shoulder ring; 322-bypass port; 33-valve spring; 34-pressing sleeve; 341-connecting column; 4-universal shaft; 5-drive shaft section; 6-anti-drop structure; 61-connecting cylinder; 62-anti-drop disc; 621-first guide hole; 63-connecting disc; 631-second guide hole; 632-disc spring; 64-anti-drop rod; 641-limiting head. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0045] Please also read Figures 1 to 4 The assembled anti-slipping regeneration screw drill provided by the embodiment of the present application is now described. An assembled anti-slipping regeneration screw drill comprises: a main barrel shell, a screw motor, a bypass valve, a universal shaft and a transmission shaft section.

[0046] The two ends of the main cylinder shell are respectively the first connecting end and the second connecting end; a positioning ring is provided on the inner wall of the main cylinder shell, and the positioning ring divides the inner cavity of the main cylinder shell into a front cavity close to the first connecting end and a rear cavity close to the second connecting end; an inner conical surface is provided on one end of the positioning ring facing the front cavity.

[0047] The screw motor is suitable for being installed into the front section cavity from the first connecting end, and comprises a stator housing and a rotor screw; the two ends of the stator housing are respectively a liquid inlet end and a liquid outlet end, and the outer peripheries of the liquid inlet end and the liquid outlet end are provided with outer conical surfaces; the rotor screw is arranged in the stator housing to form a motor structure, and one end of the rotor screw extends from the liquid outlet end to form an output end; after the screw motor is installed in the front section cavity, the outer conical surface of the liquid outlet end of the stator housing abuts against the inner conical surface of the positioning ring to form a sealing fit, and positions the output end of the screw motor.

[0048] The bypass valve is suitable for being installed into the front section cavity from the first connecting end, and the outlet end is provided with an inner conical surface, and the side surface is provided with a bypass port; after the bypass valve is installed into the front section cavity, the inner conical surface of the outlet end abuts against the outer conical surface of the liquid inlet end of the stator housing to form a sealing fit and axially position the bypass valve; the side wall of the main cylinder shell is provided with a side hole opposite to the bypass port of the bypass valve.

[0049] The universal shaft is suitable for being installed into the rear section cavity from the second connecting end, and the first end is connected with the output end of the screw motor through the inner hole of the positioning ring.

[0050] The transmission shaft section comprises a transmission housing and a power shaft. The transmission housing is connected to the second connecting end of the main cylinder housing, and the power shaft is connected to the second end of the universal shaft.

[0051] Compared with the prior art, the assembled anti-dropping regeneration screw drill of the embodiment of the present application redesigns the overall assembly structure of the screw drill. By installing the screw motor, bypass valve and universal shaft in the main barrel shell, the tapered thread connection exposed to the outside is reduced, and the difficulty of disassembly caused by rust is avoided.

[0052] At the same time, since the number of tapered thread connections on the screw drill housing is reduced, the settings of the internal screw motor, bypass valve and universal shaft are no longer restricted by the tapered thread connections of the housing, and the axial length and position of each part can be freely designed. The bypass valve and universal shaft can be designed to be more compact, leaving more space to increase the length of the screw motor and improve efficiency.

[0053] The screw motor is positioned and sealed in the main barrel shell by the inner cone surface of the positioning ring, and the bypass valve and the screw motor are positioned and sealed by the outer cone surface of the liquid inlet end of the stator shell, realizing positioning and sealing connection at the same time, making disassembly and assembly more convenient and facilitating the recycling of screw drilling tools.

[0054] It should be noted that: for the convenience of description, unless otherwise specified, the axial direction refers to the axis direction of the main cylinder shell, and the radial direction refers to the diameter direction of the main cylinder shell.

[0055] In this embodiment, the main barrel shell is a long round tube, and its length is based on being able to accommodate the screw motor, the bypass valve and the universal shaft in sequence. The first connecting end and the second connecting end of the main barrel shell can be respectively provided with internal tapered threads, the first connecting end is used to connect with the drill rod, and the second connecting end is used to connect with the transmission housing of the transmission shaft section. The positioning ring can be an integral structure with the main barrel shell, or it can be fixed on the inner wall of the middle part of the main barrel shell near the second connecting end by bolt connection or the like.

[0056] In this embodiment, the motor structure formed by the stator housing and the rotor screw of the screw motor can refer to the screw drilling tools on the market. The output end formed by the rotor screw can be set longer to pass through the positioning ring to facilitate the connection of the universal shaft. In addition, one of the obvious differences is that the outer conical surface is set on the outer periphery of the liquid outlet and liquid inlet of the stator housing in this embodiment. During assembly, the screw motor is installed into the main barrel shell from the first connection end, and the liquid outlet end of the stator housing is abutted against the inner conical surface of the positioning ring through the outer conical surface, so as to achieve a sealed connection between the liquid outlet end of the stator housing and the positioning ring, so that the drilling fluid flowing out of the screw motor enters the rear section of the main barrel shell to avoid backflow to the front section; at the same time, the liquid outlet end of the stator housing can also achieve axial and radial positioning through the positioning effect of the two conical surfaces, thereby positioning the output end of the screw motor in the axial and radial directions.

[0057] In this embodiment, the structure of the bypass valve can refer to the screw drill tools on the market. The side hole is set on the side wall of the main barrel shell to ensure that the bypass port of the bypass valve can discharge liquid to the outside. In addition, one of the obvious differences is that the outlet end of the bypass valve is provided with an inner cone. During assembly, after the screw motor is installed into the main barrel shell from the first connection end, the bypass valve is installed into the main barrel shell from the first connection end, so that the inner cone surface of the outlet end of the bypass valve is against the outer cone surface of the liquid inlet end of the stator shell, thereby realizing the sealed connection between the outlet end of the bypass valve and the liquid inlet end of the stator shell, so that the drilling fluid passing through the bypass valve directly enters the screw motor; at the same time, the liquid inlet end of the stator shell can also achieve axial and radial positioning through the positioning effect of the two cone surfaces.

[0058] In this embodiment, the structure of the universal shaft can refer to the screw drill tools on the market. During installation, the universal shaft is installed into the rear section cavity from the second connection end of the main barrel shell, so that the first end of the universal shaft is connected to the output end of the screw motor through the inner hole of the positioning ring, and specifically, a threaded connection can be adopted.

[0059] In this embodiment, the transmission housing and power shaft structure of the transmission shaft section can refer to the screw drilling tools on the market. The transmission housing can be connected to the second connecting end of the main barrel shell through a tapered thread, and the internal power shaft is connected to the second end of the universal shaft.

[0060] See also Figure 1 and Figure 3As a specific embodiment of the assembled anti-dropping regeneration screw drill provided in the present application, the assembled anti-dropping regeneration screw drill also includes an anti-dropping structure, and the anti-dropping structure includes: a connecting tube, an anti-dropping disk, a connecting disk and an anti-dropping rod.

[0061] One end of the connecting tube is connected to the first connecting end of the main tube shell, and the other end is suitable for connecting to the drill rod; the connection strength between the connecting tube and the drill rod is greater than the connection strength between the connecting tube and the main tube shell.

[0062] The anti-drop disc is arranged in the connecting tube and connected with the connecting tube; the anti-drop disc is provided with a central hole and a first flow guide hole; the connecting tube is axially conducted through the first flow guide hole.

[0063] The connecting disk is suitable for being installed into the front section cavity from the first connecting end and forming a threaded connection with the inner wall of the front section cavity. After the connecting disk is installed into the front section cavity, the bypass valve and the screw motor are pressed against the positioning ring in sequence through the screwing action of the threaded connection; the connecting disk is provided with a second guide hole; the main cylinder shell is axially guided through the second guide hole.

[0064] A limiting head is arranged at one end of the anti-drop rod, and the other end is connected with the connecting plate after passing through the anti-drop plate through the center hole, and the limiting head is limited by the anti-drop plate.

[0065] In this embodiment, a connecting tube is added to the first connecting end of the main cylinder shell to connect with the drill rod, and the connection strength between the connecting tube and the drill rod is greater than the connection strength between the connecting tube and the main cylinder shell, so that when the main cylinder shell falls off from the drill rod due to vibration, pressure and other factors, the main cylinder shell is first separated from the connecting tube. At this time, one end of the anti-drop rod is fixed to the main cylinder shell through the connecting plate, and the other end is limited by the anti-drop plate of the connecting tube, thereby preventing the main cylinder shell from falling.

[0066] In a specific implementation, the connecting tube is cylindrical in shape as a whole. One end of the connecting tube is connected to the drill rod through a tapered thread, and the other end is connected to the first connecting end of the main tube shell through a tapered thread. By increasing the number of threads connecting the connecting tube and the drill rod, the connection strength between the connecting tube and the drill rod is greater than the connection strength between the connecting tube and the main tube shell.

[0067] In a specific implementation, the anti-drop disc is in the shape of a disc and is fixed in the connecting tube. The diameter of the center hole of the anti-drop disc is larger than the diameter of the anti-drop rod, so that the anti-drop rod can flexibly pass through the anti-drop disc, and the gap between the anti-drop rod and the inner wall of the center hole of the anti-drop disc can also flow through the drilling fluid. The anti-drop disc is evenly distributed with a plurality of first guide holes, so that the drilling fluid in the drill rod can pass through the anti-drop disc from the first guide holes.

[0068] In a specific implementation, the connecting disk is in the shape of a disk, and its outer circumference is an external thread. The connecting disk is installed in the first connecting end of the main barrel shell by rotating the thread, and the bypass valve and the screw motor are pressed against the positioning ring in sequence by the screwing action of the thread, so that each part is fixed. A plurality of second guide holes are evenly arranged on the connecting disk, so that the drilling fluid in the main barrel shell can flow through the connecting disk through the second guide holes.

[0069] In a specific implementation, one end of the anti-drop rod is connected to the connecting plate through a thread, and the other end and the limit head can be an integral structure or can be connected through a thread.

[0070] See also Figure 1 and Figure 3 As a specific implementation of the assembled anti-slip regeneration screw drill provided in the present application, the bypass valve includes: a fixed valve core, a movable valve core, a valve spring and a compression sleeve.

[0071] The center of the fixed valve core is provided with an axial through hole, and one end forms an outlet end of the bypass valve.

[0072] The movable valve core has an axial through hole in the center and a bypass port on the side wall; the movable valve core is internally and externally coupled with the fixed valve core and can slide axially, and the maximum coupling length of the movable valve core shaft can at least allow the bypass port to be closed by the side wall of the fixed valve core.

[0073] The valve spring is arranged between the fixed valve core and the movable valve core, and pushes the fixed valve core and the movable valve core to separate axially, so that the bypass port exits the fixed valve core.

[0074] The compression sleeve is located at one end of the movable valve core away from the fixed valve core, and is connected to the fixed valve core through a connecting column.

[0075] The connecting plate presses against the pressing sleeve to make the fixed valve core press against the screw motor.

[0076] In a specific implementation, the fixed valve core and the movable valve core are roughly cylindrical, and the two are arranged inside and outside, usually the fixed valve core is outside and the movable valve core is inside. A sealing ring is arranged on the outer periphery of the fixed valve core to seal with the inner wall of the main barrel shell. A bypass port is arranged on the side wall in the middle of the movable valve core. When the movable valve core is inserted into the fixed valve core to a certain depth, the bypass port can enter the fixed valve core and be closed by the side wall of the fixed valve core. At this time, the drilling fluid can only enter the fixed valve core from the movable valve core; when the movable valve core is withdrawn from the fixed valve core to the outside by a certain distance, the bypass port is withdrawn from the fixed valve core. At this time, the drilling fluid can flow from the bypass port on the side wall of the movable valve core through the side hole on the side wall of the main barrel shell to the outside of the screw drilling tool.

[0077] In a specific implementation, the valve spring is supported between the fixed valve core and the movable valve core, so that the bypass port exits the fixed valve core without being affected by external forces, thereby opening.

[0078] The compression sleeve is used to transfer the pressure of the connecting plate to the fixed valve core through the connecting column, so that the fixed valve core and the screw motor are against each other. The compression sleeve is annular, and the center hole is used to avoid the through hole in the center of the movable valve core, so that the drilling fluid can enter the movable valve core through the compression sleeve.

[0079] See also Figure 3 As a specific implementation of the assembled anti-slip regeneration screw drill provided in the present application, a first shoulder ring is provided on the outer periphery of the fixed valve core, and a second shoulder ring is provided on the outer periphery of the movable valve core; the valve spring is sleeved outside the fixed valve core and the movable valve core, and the two ends are respectively against the first shoulder ring and the second outer shoulder ring.

[0080] The second outer shoulder ring is provided with a through hole along the axial direction, and the connecting column passes through the through hole to form a sliding fit.

[0081] In a specific implementation, the valve spring sleeve is arranged outside the fixed valve core and the movable valve core, and the two ends are respectively against the first shoulder ring and the second outer shoulder ring. One end of the connecting column is fixed to the end of the fixed valve core, and the other end is fixed to the pressing sleeve after passing through the through hole of the second outer shoulder, so that the fixed valve core, the movable valve core, the valve spring and the pressing sleeve form a whole, which is convenient for being assembled externally and then installed in the main cylinder shell as a whole.

[0082] In the bypass valve structure of the traditional screw drill, in order to ensure that the movable valve core and the fixed valve core form a stable axial sliding fit, the sleeve length of the movable valve core and the fixed valve core is usually not less than 30cm, which greatly increases the overall length of the bypass valve. In this embodiment, the sliding fit between the connecting column and the through hole of the second outer shoulder can guide the movable valve core, thereby shortening the minimum sleeve length of the movable valve core and the fixed valve core, thereby shortening the overall length of the bypass valve, reducing the space occupied in the axial direction, and the freed space can increase the length of the screw motor and improve efficiency. In practice, the minimum sleeve length of the movable valve core and the fixed valve core can be less than 10mm.

[0083] More specifically, there are a plurality of connecting columns, which are evenly distributed along the fixed valve core and are located inside the valve spring.

[0084] See also Figure 3 As a specific embodiment of the assembled anti-dropout regeneration screw drill provided by the present application, the minimum sleeve length of the movable valve core and the fixed valve core is less than 10 mm. The space occupied by the bypass valve in the axial direction is reduced, and the freed space can increase the length of the screw motor and improve efficiency.

[0085] See also Figure 4As a specific embodiment of the assembled anti-slip regeneration screw drill provided in the present application, a copper sleeve is provided on the outer conical surface of the liquid inlet end of the stator housing, and a copper sleeve is provided on the outer conical surface of the liquid outlet end of the stator housing; a disc spring is provided between the pressure sleeve and the connecting plate to maintain the clamping force between the bypass valve, the screw motor and the positioning ring.

[0086] In this embodiment, the deformation of the copper sleeve can make the sealing between the liquid inlet end of the stator housing and the outlet end of the bypass valve fixed valve core, and the liquid outlet end of the stator housing and the positioning ring more tight. The elastic force of the disc spring is used to keep the bypass valve, the screw motor and the positioning ring tightly pressed. Even if the screw drill is vibrated or impacted during later use, causing slight movement or deformation of the two ends of the stator housing, the pressure of the disc spring and the deformation of the copper sleeve can restore the sealing of the two ends of the stator housing.

[0087] See also Figure 1 and Figure 2 , as a specific embodiment of the assembled anti-slip regeneration screw drill provided by the present application, the output end of the rotor screw is threadedly connected to the first end of the universal shaft, and a sealing ring is provided at the outer joint;

[0088] The side surface of the output end of the rotor screw is provided with a positioning plane, and the main cylinder shell is provided with a pre-sealing hole, and the position of the pre-sealing hole in the axial direction is radially opposite to the position of the positioning plane in the axial direction;

[0089] During operation, the pre-sealed hole is blocked by a blocking piece, and during disassembly and assembly, the pre-sealed hole allows a positioning rod to be inserted, so that the positioning rod abuts against the positioning plane and limits the rotation of the output end of the rotor screw.

[0090] In this embodiment, when the assembled anti-slipping regeneration screw drill tool is working normally, the plugging piece is used to plug the pre-sealed hole to prevent the external drilling fluid from entering the pre-sealed hole. When the assembled anti-slipping regeneration screw drill tool is produced or regenerated, the plugging piece is removed from the pre-sealed hole, and the positioning rod is inserted from the pre-sealed hole and abutted against the positioning plane of the rotor screw output end, so that the rotor screw output end cannot rotate. At this time, the universal shaft can be easily assembled or separated from the rotor screw output end by rotating.

[0091] In addition, in this embodiment, the sealing ring is used to seal the threaded joint between the output end of the rotor screw and the first end of the universal shaft to prevent drilling fluid from entering the threaded joint and prevent thread corrosion from causing difficulty in disassembly. In a specific implementation, the output end of the rotor screw and the first end of the universal shaft can be connected by a tapered thread, and the tapered thread connection can further prevent drilling fluid from entering the threaded joint.

[0092] See also Figure 1 and Figure 2As a specific embodiment of the assembled anti-slip regeneration screw drilling tool provided in the present application, the pre-sealed hole is a countersunk threaded hole, the sealing piece is a countersunk bolt suitable for threaded connection with the pre-sealed hole, and the positioning rod is a long screw suitable for threaded connection with the pre-sealed hole.

[0093] In this embodiment, during disassembly and assembly, the sealing member is withdrawn from the pre-sealed hole, and then the positioning rod is screwed into the pre-sealed hole until the end of the positioning rod abuts against the positioning plane of the output end of the rotor screw, thereby fixing the output end of the rotor screw, and the universal joint can be easily disassembled and assembled.

[0094] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. Assembled anti-dropping regeneration screw drill, characterized in that: include: A main barrel shell, with two ends respectively being a first connecting end and a second connecting end; a positioning ring is provided on the inner wall of the main barrel shell, and the positioning ring divides the inner cavity of the main barrel shell into a front cavity close to the first connecting end and a rear cavity close to the second connecting end; an end of the positioning ring facing the front cavity is provided with an inner conical surface; A screw motor, suitable for being installed into the front section cavity from the first connecting end, comprises a stator housing and a rotor screw; the two ends of the stator housing are respectively a liquid inlet end and a liquid outlet end, and the outer peripheries of the liquid inlet end and the liquid outlet end are provided with outer conical surfaces; the rotor screw is arranged in the stator housing to form a motor structure, and one end of the rotor screw extends from the liquid outlet end to form an output end; after the screw motor is installed in the front section cavity, the outer conical surface of the liquid outlet end of the stator housing abuts against the inner conical surface of the positioning ring to form a sealing fit, and positions the output end of the screw motor; A bypass valve is suitable for being installed into the front section cavity from the first connecting end, and the outlet end is provided with an inner conical surface, and the side surface is provided with a bypass port; after the bypass valve is installed into the front section cavity, the inner conical surface of the outlet end abuts against the outer conical surface of the liquid inlet end of the stator housing to form a sealing fit, and the bypass valve is axially positioned; the side wall of the main cylinder shell is provided with a side hole opposite to the bypass port of the bypass valve; A universal shaft, adapted to be installed into the rear section cavity from the second connecting end, and having a first end connected to an output end of the screw motor through an inner hole of the positioning ring; and The transmission shaft section comprises a transmission housing and a power shaft, wherein the transmission housing is connected to the second connecting end of the main cylinder shell, and the power shaft is connected to the second end of the universal shaft.

2. The assembled anti-dropping regeneration screw drill according to claim 1, characterized in that: The assembled anti-dropping regeneration screw drill also includes an anti-dropping structure, which includes: A connecting tube, one end of which is connected to the first connecting end of the main tube shell, and the other end of which is suitable for connecting to a drill rod; the connection strength between the connecting tube and the drill rod is greater than the connection strength between the connecting tube and the main tube shell; The anti-drop disk is arranged in the connecting tube and connected to the connecting tube; the anti-drop disk is provided with a center hole and a first flow guide hole; the connecting tube is axially conducted through the first flow guide hole; A connecting plate, adapted to be installed into the front section cavity from the first connecting end and to form a threaded connection with the inner wall of the front section cavity, and after the connecting plate is installed into the front section cavity, the bypass valve and the screw motor are pressed against the positioning ring in sequence by the screwing action of the threaded connection; the connecting plate is provided with a second guide hole; the main cylinder shell is axially conducted through the second guide hole; and The anti-drop rod has a limiting head at one end and the other end passes through the anti-drop plate through the center hole and is connected to the connecting plate. The limiting head limits the anti-drop plate.

3. The assembled anti-dropping regeneration screw drill according to claim 2, characterized in that: The bypass valve comprises: A fixed valve core having an axial through hole at its center and one end forming an outlet of the bypass valve; The movable valve core has an axial through hole at its center and the bypass port is provided on its side wall; the movable valve core is internally and externally coupled with the fixed valve core and is axially slidable, and the maximum coupling length of the movable valve core shaft is at least sufficient to allow the bypass port to be closed by the side wall of the fixed valve core; a valve spring, disposed between the fixed valve core and the movable valve core, to push the fixed valve core and the movable valve core to separate axially so that the bypass port exits the fixed valve core; and A compression sleeve, located at one end of the movable valve core away from the fixed valve core, and connected to the fixed valve core through a connecting column; The connecting plate presses against the pressing sleeve so that the fixed valve core is pressed against the screw motor.

4. The assembled anti-dropping regeneration screw drill according to claim 3, characterized in that: A first shoulder ring is provided on the outer periphery of the fixed valve core, and a second shoulder ring is provided on the outer periphery of the movable valve core; the valve spring is sleeved outside the fixed valve core and the movable valve core, and two ends thereof are respectively against the first shoulder ring and the second outer shoulder ring; The second outer shoulder ring is provided with a through hole along the axial direction, and the connecting column passes through the through hole to form a sliding fit.

5. The assembled anti-dropping regeneration screw drill according to claim 4, characterized in that: The minimum sleeve length between the movable valve core and the fixed valve core is less than 10 mm.

6. The assembled anti-dropping regeneration screw drill according to claim 5, characterized in that: The outer conical surface of the liquid inlet end of the stator housing is provided with a copper sleeve, and the outer conical surface of the liquid outlet end of the stator housing is provided with a copper sleeve; a disc spring is provided between the compression sleeve and the connecting plate to maintain a pressing force between the bypass valve, the screw motor and the positioning ring.

7. The assembled anti-dropping regeneration screw drill according to claim 1, characterized in that: The output end of the rotor screw is threadedly connected to the first end of the universal shaft, and a sealing ring is provided at the outer joint; The side surface of the output end of the rotor screw is provided with a positioning plane, and the main cylinder shell is provided with a pre-sealed hole, and the position of the pre-sealed hole in the axial direction is radially opposite to the position of the positioning plane in the axial direction; During operation, the pre-sealed hole is blocked by a blocking member, and during assembly and disassembly, the pre-sealed hole allows a positioning rod to be inserted, so that the positioning rod abuts against the positioning plane and limits the rotation of the output end of the rotor screw.

8. The assembled anti-dropping regeneration screw drill according to claim 7, characterized in that: The pre-sealed hole is a countersunk threaded hole, the blocking piece is a countersunk bolt suitable for being threadedly connected to the pre-sealed hole, and the positioning rod is a long screw suitable for being threadedly connected to the pre-sealed hole.

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