Wear-resistant screw drill bit

Abstract

This utility model discloses a wear-resistant screw drill bit, belonging to the technical field of screw drill bits. The wear-resistant screw drill bit includes a bypass valve, a hydraulic motor, a universal joint, a drive shaft, and a housing. The universal joint includes a connecting rod, with ball seats and short sections at both ends. A locking sleeve is provided between the ball seats and the short sections. A cavity is formed inside the ball seats, and a movable groove is formed on the outer side of the ball seats. A movable rod is slidably connected to the inner side of the movable groove, and a movable block is fixed to the outer side of the movable rod. Two sealing rings are embedded on the outer side of the movable block. This utility model can automatically filter metal debris from the lubricating oil, greatly extending the working life of the lubricating oil and reducing the frequency of lubricating oil replacement. To a certain extent, it solves the problem that universal joints are prone to wear in high-temperature and high-pressure environments, requiring regular lubricating oil replacement to prevent metal debris from further aggravating wear, which is time-consuming and labor-intensive.

Description

Technical Field

[0001] This utility model belongs to the field of screw drill technology, and more specifically, it relates to a wear-resistant screw drill. Background Technology

[0002] A screw drill is a volumetric downhole power drill powered by drilling fluid. Its main function is to utilize the pressure energy of the drilling fluid, which enters the motor through a bypass valve, thereby creating a pressure difference between the inlet and outlet. This pressure difference drives the rotor to rotate around the axis of the stator. The power and torque of this rotation are then transmitted through the universal joint and the drive shaft, ultimately acting on the drill bit to complete the drilling operation. Existing screw drills have core components including a bypass valve, a hydraulic motor, a universal joint, and a drive shaft. The universal joint is prone to wear in high-temperature and high-pressure environments, requiring regular lubrication oil changes to prevent metal debris from further aggravating wear, which is time-consuming and labor-intensive. Therefore, a wear-resistant screw drill is proposed. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a wear-resistant screw drill tool that can automatically filter metal debris from the lubricating oil, greatly extending the working life of the lubricating oil and reducing the frequency of lubricating oil replacement. This solves the problem mentioned in the background art that universal joints are prone to wear in high-temperature and high-pressure environments, requiring regular lubricating oil replacement to prevent metal debris from further aggravating wear, which is time-consuming and labor-intensive.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a wear-resistant screw drill bit, comprising a bypass valve, a hydraulic motor, a universal joint, a drive shaft, and a housing. The universal joint includes a connecting rod, with ball seats and short sections at both ends. A locking sleeve is provided between the ball seats and the short sections. A cavity is formed inside the ball seats, and a movable groove is formed on the outer side of the ball seats. A movable rod is slidably connected to the inner side of the movable groove. A movable block is fixed to the outer side of the movable rod, and two sealing rings are embedded on the outer side of the movable block. A filter block is fixed to the inner side of the cavity. The cavity is divided into an inlet area and a outlet area by the filter block. An inlet groove and an outlet groove are also formed inside the ball seats. An inlet check valve and an outlet check valve are respectively provided inside the inlet groove and the outlet groove. Two eccentric rings are fixed to the inner side of the housing. The inner circumference of the eccentric rings is eccentrically circular, and the inner circumference of the eccentric rings is in slidable contact with both ends of the movable rod.

[0005] As a preferred embodiment of this invention, the interior of the movable groove is connected to the interior of the cavity.

[0006] As a preferred embodiment of this utility model, the filter block has an annular cross-section, and the inner side of the filter block slides in contact with the outer side of the movable block.

[0007] As a preferred embodiment of this utility model, the interior of the liquid inlet tank is connected to the interior of the liquid inlet area.

[0008] As a preferred embodiment of this utility model, the interior of the drainage tank is connected to the interior of the drainage area.

[0009] As a preferred embodiment of this invention, the outer side of the sealing ring is slidably connected to the inner side of the cavity.

[0010] As a preferred embodiment of this invention, the short section is located inside the ball seat.

[0011] This utility model provides a wear-resistant screw drill bit, which has the following beneficial effects: 1. This wear-resistant screw drill bit can automatically filter metal debris from the lubricating oil, greatly extending the working life of the lubricating oil and reducing the frequency of lubricating oil replacement. To a certain extent, it solves the problem that universal joints are prone to wear in high temperature and high pressure environments, requiring regular lubricating oil replacement to avoid further aggravation of wear by metal debris, which is time-consuming and labor-intensive.

[0012] 2. This wear-resistant screw drill has a reasonable and compact structural design and good performance. Attached Figure Description

[0013] Figure 1 This is a cross-sectional structural diagram of a wear-resistant screw drill tool according to the present invention.

[0014] Figure 2 This is a cross-sectional schematic diagram of the universal joint portion of a wear-resistant screw drill according to this utility model.

[0015] Figure 3 This utility model relates to a wear-resistant screw drill bit. Figure 2 Enlarged diagram of point A in the diagram.

[0016] Figure 4 This utility model relates to a wear-resistant screw drill bit. Figure 2 Enlarged diagram of point B in the image.

[0017] In the diagram: 1. Bypass valve; 2. Hydraulic motor; 3. Universal joint; 4. Drive shaft; 5. Housing; 31. Connecting rod; 32. Ball seat; 33. Short section; 34. Locking sleeve; 35. Cavity; 351. Liquid inlet area; 352. Liquid outlet area; 36. Movable rod; 37. Movable block; 38. Sealing ring; 39. Filter block; 310. Liquid inlet tank; 311. Liquid outlet tank; 312. Liquid inlet check valve; 313. Liquid outlet check valve; 314. Eccentric ring. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Please see Figures 1 to 4This utility model provides a technical solution: a wear-resistant screw drill, including a bypass valve 1, a hydraulic motor 2, a universal joint 3, a drive shaft 4, and a housing 5. The universal joint 3 includes a connecting rod 31, with ball seats 32 and short sections 33 at both ends. A locking sleeve 34 is provided between the ball seats 32 and the short sections 33. A cavity 35 is provided inside the ball seats 32, and a movable groove is provided on the outer side of the ball seats 32. A movable rod 36 is slidably connected to the inner side of the movable groove. A movable block 37 is fixed to the outer side of the movable rod 36, and two sealing rings 38 are embedded on the outer side of the movable block 37. A filter block 39 is fixed to the inner side of the cavity 35, and the interior of the cavity 35 is divided into an inlet area 351 and a drain area 352 by the filter block 39. An inlet groove 35 is also provided inside the ball seats 32. 10 and drain trough 311, the inside of the inlet trough 310 and the inside of the drain trough 311 are respectively provided with inlet check valve 312 and drain check valve 313, two eccentric rings 314 are fixed on the inner side of the outer shell 5, the inner circumference of the eccentric ring 314 is eccentric circle structure, the inner circumference of the eccentric ring 314 is in sliding contact with the two ends of the movable rod 36, the inside of the movable trough is connected to the inside of the cavity 35, the cross section of the filter block 39 is annular structure, the inner side of the filter block 39 is in sliding contact with the outer side of the movable block 37, the inside of the inlet trough 310 is connected to the inside of the inlet area 351, the inside of the drain trough 311 is connected to the inside of the drain area 352, the outer side of the sealing ring 38 is slidably connected to the inner side of the cavity 35, and the short section 33 is located inside the ball seat 32; When the hydraulic motor 2 drives the universal joint 3 to rotate, the ball seat 32 in the universal joint 3 rotates accordingly. During this process, the movable rod 36 on the ball seat 32 slides along the inner side of the eccentric ring 314. Because the inner circumference of the eccentric ring 314 is eccentrically circular, the distance between the contact point of the movable rod 36 and the eccentric ring 314 and the center of the outer shell 5 changes from maximum to minimum and then back to maximum, thereby driving the movable rod 36 to reciprocate along the movable groove. The movable rod 36 drives the movable block 37 to reciprocate along the cavity 35. When the movable block 37 moves away from the filter block 39, a negative pressure is generated inside the cavity 35, the inlet check valve 312 opens, the outlet check valve 313 closes, and the lubricating oil flows from the short... The lubricating oil enters the inlet channel 310 through the inlet channel 310 and then flows into the drain area 352 through the filter block 39. When the movable block 37 approaches the filter block 39, positive pressure is generated inside the cavity 35, the inlet check valve 312 closes, and the drain check valve 313 opens. The lubricating oil returns to the location of the short section 33 through the drain channel 311. Through the above process, metal debris in the lubricating oil can be automatically filtered, which greatly extends the working life of the lubricating oil and reduces the frequency of lubricating oil replacement. To a certain extent, this solves the problem that the universal joint is prone to wear in high temperature and high pressure environments, requiring regular lubricating oil replacement to avoid further wear caused by metal debris, which is time-consuming and labor-intensive.

[0022] The specific usage and function of this embodiment: In this utility model, the hydraulic motor 2 drives the universal shaft 3 to rotate, and the ball seat 32 in the universal shaft 3 rotates accordingly. During this process, the movable rod 36 on the ball seat 32 slides along the inner side of the eccentric ring 314. Since the inner circumference of the eccentric ring 314 is an eccentric circle structure, the distance between the contact position of the movable rod 36 and the eccentric ring 314 and the center of the outer shell 5 changes from the maximum to the minimum and then back to the maximum, thereby driving the movable rod 36 to move back and forth along the movable groove. The movable rod 36 drives the movable block 37 to move back and forth along the cavity 35. When the movable block 37 moves away from the filter block 39, a negative pressure is generated inside the cavity 35, the inlet check valve 312 opens, and the outlet check valve 313 closes. The lubricating oil enters the inlet groove 310 from the location of the short section 33 and enters the outlet area 352 through the filter block 39. When the movable block 37 moves closer to the filter block 39, a positive pressure is generated inside the cavity 35, the inlet check valve 312 closes, and the outlet check valve 313 opens. The lubricating oil returns to the location of the short section 33 through the outlet groove 311. Through the above process, metal debris in the lubricating oil can be automatically filtered, which greatly extends the working life of the lubricating oil and reduces the frequency of lubricating oil replacement.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A wear-resistant screw drill bit, comprising a bypass valve (1), a hydraulic motor (2), a universal joint (3), a drive shaft (4), and a housing (5), characterized in that: The universal joint (3) includes a connecting rod (31), with ball seats (32) and short sections (33) at both ends. A locking sleeve (34) is provided between the ball seats (32) and the short sections (33). A cavity (35) is provided inside the ball seats (32), and a movable groove is provided on the outer side of the ball seats (32). A movable rod (36) is slidably connected to the inner side of the movable groove. A movable block (37) is fixed on the outer side of the movable rod (36), and two sealing rings (38) are embedded on the outer side of the movable block (37). A filter block (39) is fixed on the inner side of the cavity (35). The cavity (35) is divided into an inlet area (351) and a drain area (352) by a filter block (39). The ball seat (32) is also provided with an inlet groove (310) and a drain groove (311). The inlet groove (310) and the drain groove (311) are respectively provided with an inlet check valve (312) and a drain check valve (313). Two eccentric rings (314) are fixed on the inner side of the outer shell (5). The inner circumference of the eccentric ring (314) is eccentrically circular. The inner circumference of the eccentric ring (314) is in sliding contact with the two ends of the movable rod (36).

2. The wear-resistant screw drill bit according to claim 1, characterized in that: The interior of the movable groove is connected to the interior of the cavity (35).

3. The wear-resistant screw drill bit according to claim 1, characterized in that: The filter block (39) has a ring-shaped cross-section, and the inner side of the filter block (39) slides in contact with the outer side of the movable block (37).

4. The wear-resistant screw drill bit according to claim 1, characterized in that: The interior of the liquid inlet tank (310) is connected to the interior of the liquid inlet area (351).

5. The wear-resistant screw drill bit according to claim 1, characterized in that: The interior of the drain tank (311) is connected to the interior of the drain area (352).

6. The wear-resistant screw drill bit according to claim 1, characterized in that: The outer side of the sealing ring (38) is slidably connected to the inner side of the cavity (35).

7. The wear-resistant screw drill bit according to claim 1, characterized in that: The short section (33) is located inside the ball seat (32).

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