High-wear-resistance large-torque trenchless screw drill

Abstract

The utility model provides a high-wear-resistance large-torque trenchless screw drill, and belongs to the field of drilling equipment. A high-abrasion-resistance large-torque non-excavation type screw drill comprises a hydraulic motor assembly, a universal shaft assembly and a transmission shaft assembly which are sequentially connected. Wherein the hydraulic motor assembly comprises a stator and a rotor matched with the stator, the output end of the rotor comprises an extending section and a connecting section, the outer diameter of the connecting section is larger than that of the extending section, a protruding flow guide part is arranged on the periphery of the extending section, the outer side face of the flow guide part is a flow guide inclined face, and the flow guide inclined face is matched with the connecting section. According to the hydraulic motor, the flow guide part is arranged on the extension section of the output end of the rotor, drilling fluid from the hydraulic motor is buffered through the flow guide slope of the flow guide part, the part, close to the surface of the connecting section, of the drilling fluid forms a slow flow layer, and therefore abrasion of the drilling fluid to the connecting section is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling equipment, and more particularly relates to a high-wear-resistance large-torque trenchless screw drill. BACKGROUND

[0002] The screw drill is a volume type downhole power drill which converts liquid pressure energy into mechanical energy by using drilling fluid as power. The screw drill mainly consists of four assemblies, i.e. a bypass valve, a liquid motor, a universal shaft and a transmission shaft. When the screw drill is working, the drilling fluid mixed with sand flows through each assembly in turn, so that the wear of each assembly is extremely great. In order to solve the problem of wear, the surface of each part of the screw drill is usually hardened during production, such as carburizing and hard chromium plating, so as to increase the hardness and reduce the wear rate. However, there are still some positions with relatively large wear, for example, the output end of the liquid motor. The output end of the liquid motor is usually provided with a tapered thread structure for connecting with the universal shaft, so that the diameter of the output end of the liquid motor is usually large, which leads to that the drilling fluid flowing out of the liquid motor directly impacts the output end of the liquid motor, resulting in serious wear. When the screw drill is recycled and regenerated, a large amount of repair is required for this part, which greatly increases the difficulty of regeneration. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a high-wear-resistance large-torque trenchless screw drill to solve the technical problem of serious wear of the output end of the liquid motor of the screw drill caused by direct impact of the drilling fluid.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] The present application provides a high-wear-resistance large-torque trenchless screw drill, which comprises: liquid motor assembly, universal shaft assembly and transmission shaft assembly connected in sequence; wherein the liquid motor assembly comprises a stator and a rotor matched with the stator, the output end of the rotor comprises an extension section and a connecting section, and the outer diameter of the connecting section is larger than that of the extension section, the outer periphery of the extension section is provided with a protruding flow guide part, the outer side surface of the flow guide part is a flow guide inclined surface, and the flow guide inclined surface is inclined in the flow direction and deviates from the central axis of the rotor.

[0006] In some embodiments, the height of the flow guide part protruding from the extension section is not more than the radius difference between the connecting section and the extension section.

[0007] In some embodiments, the flow guide part forms a flow guide ring around the connecting section, and the outer side surface of the flow guide ring is a conical surface and forms the flow guide inclined surface.

[0008] In some embodiments, the flow guide ring is detachably connected with the connecting section.

[0009] In some embodiments, the extension section is provided with a mounting slot, and the flow guide ring is embedded in the mounting slot.

[0010] In some embodiments, in the countercurrent direction, the front side of the flow guide ring is a convex conical surface, and the front side of the mounting slot is a concave conical surface and is in contact with the front side of the flow guide ring.

[0011] In some embodiments, a positioning snap ring is also embedded in the mounting slot, and the positioning snap ring is supported between the rear side of the flow guide ring and the rear side wall of the mounting slot.

[0012] In some embodiments, the flow guide ring is made of alloy steel containing chromium, molybdenum and vanadium elements.

[0013] The high-wear-resistance large-torque trenchless screw drill provided by the embodiments of the present application has the beneficial effects that, compared with the prior art, the high-wear-resistance large-torque trenchless screw drill of the embodiments of the present application buffers the drilling fluid from the hydraulic motor through the flow guide slope of the flow guide part arranged on the extension section of the rotor output end, so that the part of the drilling fluid close to the surface of the connecting section forms a buffer flow layer, thereby reducing the wear of the connecting section by the drilling fluid. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 A perspective view of the high-wear-resistance large-torque trenchless screw drill provided by the embodiments of the present application is shown in the drawings.

[0016] Figure 2 A perspective view of the high-wear-resistance large-torque trenchless screw drill provided by the embodiments of the present application is shown in the drawings. Figure 1 A sectional view of the medium-high-wear-resistance large-torque trenchless screw drill is shown in the drawings.

[0017] Figure 3 A sectional view of the medium-high-wear-resistance large-torque trenchless screw drill is shown in the drawings. Figure 2 A local enlarged view of position A in the drawings.

[0018] Figure 4 A local enlarged view of position A in the drawings. Figure 3 A local sectional view of the flow guide ring and the positioning snap ring is shown in the drawings.

[0019] In the drawings, various reference signs are used:

[0020] 1 - hydraulic motor assembly; 11 - stator; 12 - rotor; 13 - extension section; 14 - connecting section; 15 - mounting slot; 2 - universal shaft assembly; 3 - transmission shaft assembly; 4 - flow guide ring; 41 - flow guide inclined surface; 5 - positioning snap ring. DETAILED DESCRIPTION

[0021] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" 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.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly and specifically limited.

[0025] Please refer to Figures 1 to 4 , now the high-wear-resistance large-torque trenchless screw drill provided by the embodiments of the present application will be described. A high-wear-resistance large-torque trenchless screw drill, comprising: a hydraulic motor assembly, a universal shaft assembly and a transmission shaft assembly connected in sequence; wherein the hydraulic motor assembly comprises a stator and a rotor matched with the stator, the output end of the rotor comprises an extension section and a connecting section, and the outer diameter of the connecting section is greater than the outer diameter of the extension section, the outer periphery of the extension section is provided with a protruding flow guide part, the outer side surface of the flow guide part is a flow guide inclined surface, and the flow guide inclined surface is inclined away from the central axis of the rotor in the flow direction.

[0026] Compared with the prior art, the high-wear-resistance large-torque trenchless screw drill of the embodiment of the application has a flow guide part arranged at the extension section of the rotor output end, and a flow guide slope of the flow guide part buffers the drilling fluid from the hydraulic motor, so that the part of the drilling fluid close to the surface of the connecting section forms a slow flow layer, thereby reducing the wear of the connecting section by the drilling fluid.

[0027] The specific structure of the hydraulic motor assembly, the universal shaft assembly and the transmission shaft assembly in the embodiment can refer to the structure of the screw drill in the prior art. The hydraulic motor assembly includes a stator and a rotor, the stator is a rubber bushing with a helical line type inner cavity vulcanized and formed in a metal shell, and the rotor is a screw-shaped metal shaft matched with the inner cavity of the stator. The cooperation of the stator and the rotor can refer to the prior art. The universal shaft assembly includes a shell and a universal shaft arranged inside the shell, and the annular gap between the universal shaft and the shell allows the drilling fluid to pass through. The output end of the rotor of the hydraulic motor assembly includes an extension section and a connecting section, the extension section is arranged to make the connecting section protrude out of the stator, so that the connecting section can be connected with the end of the universal shaft of the universal shaft assembly through the tapered thread.

[0028] In use, generally, the front end of the hydraulic motor assembly is connected with the bypass valve assembly, and the drilling fluid flows through the bypass valve assembly, the hydraulic motor assembly, the universal shaft assembly and the transmission shaft assembly in sequence. Specifically, after the drilling fluid flows out of the hydraulic motor assembly, it enters the annular gap between the universal shaft and the shell from the annular gap on the outer periphery of the rotor output end. During this process, the outer diameter of the connecting section of the rotor output end increases, causing the drilling fluid flowing through to impact the outer surface of the connecting section.

[0029] In the embodiment, the forward flow direction refers to the direction of the drilling fluid flowing through the entire high-wear-resistance large-torque trenchless screw drill. The connecting section is provided with a flow guide part, and the flow guide slope of the flow guide part is inclined in the forward flow direction and deviates from the central axis of the rotor, so that when the drilling fluid flows through the rotor output end, the flow guide part blocks the drilling fluid, and the flow guide slope guides the drilling fluid to deviate from the connecting section. On the one hand, it can directly avoid the impact of the drilling fluid on the connecting section, and on the other hand, the part of the drilling fluid slowed down by the flow guide part continues to flow forward to form a slow flow layer along the surface of the connecting section, thereby avoiding the wear of the connecting section by other high-speed drilling fluid.

[0030] In specific implementation, the bypass valve assembly, the hydraulic motor assembly, the universal shaft assembly and the transmission shaft assembly are preferably made of wear-resistant alloy material and special rubber formula, and the wear resistance of each component is strengthened through heat treatment and surface hardening process. The flow channel design is optimized to reduce mud scouring, reduce local wear, greatly prolong the service life of the entire drill, and reduce the replacement frequency and maintenance cost.

[0031] Please refer to Figure 4As a specific embodiment of the high-wear-resistance large-torque non-excavation type screw drill provided in the present application, the height of the flow guide part protruding from the extension section is not more than the radius difference between the connecting section and the extension section.

[0032] In the present embodiment, the height of the flow guide part is not more than the radius difference between the connecting section and the extension section, which can avoid forming too large flow resistance to the drilling fluid and reduce the pressure of the drilling fluid.

[0033] In the specific implementation, generally, the height of the flow guide part is about 1 / 2-1 / 3 of the radius difference between the connecting section and the extension section. Specifically, it needs to be determined through experiments according to the flow speed of the drilling fluid near the output end of the rotor, so as to ensure that the effect of reducing wear can be achieved and too large flow resistance can be avoided.

[0034] Please refer to Figure 3 and Figure 4 As a specific embodiment of the high-wear-resistance large-torque non-excavation type screw drill provided in the present application, the flow guide part forms a flow guide ring around the connecting section, and the outer side of the flow guide ring is a conical surface and forms a flow guide inclined surface.

[0035] In the present embodiment, the flow guide ring can reduce the flow speed of all the drilling fluid around and better protect the connecting section. Moreover, the flow guide ring and the outer side conical surface are easier to process. In the specific implementation, the flow guide ring and the outer side conical surface can be processed on the outer periphery of the connecting section through turning.

[0036] Please refer to Figure 4 As a specific embodiment of the high-wear-resistance large-torque non-excavation type screw drill provided in the present application, the flow guide ring and the connecting section are detachably connected.

[0037] In the present embodiment, since the flow guide ring replaces the connecting section to bear the direct impact of the drilling fluid, the flow guide ring is more likely to wear. When the flow guide ring is worn to a certain extent, the flow guide ring can be replaced to restore its function.

[0038] Please refer to Figures 1 to 4 As a specific embodiment of the high-wear-resistance large-torque non-excavation type screw drill provided in the present application, the outer periphery of the extension section is provided with a mounting clamping groove, and the flow guide ring is embedded in the mounting clamping groove.

[0039] In the present embodiment, the embedded mode is adopted, and the installation and replacement are more convenient.

[0040] Please refer to Figures 1 to 4 As a specific embodiment of the high-wear-resistance large-torque non-excavation type screw drill provided in the present application, in the countercurrent direction, the front side of the flow guide ring is an outward convex conical surface, the front side of the mounting clamping groove is an inward recessed conical surface, and the front side of the flow guide ring is in contact with the front side of the mounting clamping groove.

[0041] Since the flow guide ring directly bears the direct impact of the drilling fluid, the stress is large. If the conventional rectangular clamping groove is used, the front side surface of the flow guide ring and the front side surface of the clamping groove are easy to form a gap when the flow guide ring is impacted by the drilling fluid, and the drilling fluid continues to flow into the gap and is easy to make the flow guide ring fall out.

[0042] In the embodiment, the front side surface of the flow guide ring is a convex conical surface. Even under the impact of the drilling fluid, a gap is formed between the front side surface of the flow guide ring and the front side surface of the clamping groove. After the drilling fluid enters the gap, the pressure on the front side surface of the flow guide ring will make the flow guide ring hold the extended section more tightly, and the flow guide ring will not fall out.

[0043] In the specific implementation, the front side surface of the flow guide ring is machined into a coaxial conical surface by turning. Generally, the taper of the front side surface of the flow guide ring is set to be larger to facilitate the machining of the corresponding front side surface of the flow guide ring.

[0044] Please refer to Figure 4 , as a specific embodiment of the high-wear-resistance large-torque trenchless screw drill provided by the present application, a positioning clasp is also embedded in the mounting clamping groove, which is supported between the rear side surface of the flow guide ring and the rear side wall of the mounting clamping groove.

[0045] In the embodiment, the flow guide ring can be first installed in the mounting clamping groove, and then the positioning clasp is installed in the mounting clamping groove, so that the positioning clasp is supported between the rear side surface of the flow guide ring and the rear side wall of the mounting clamping groove, thereby fixing the flow guide ring. The flow guide ring can shield the rear positioning clasp to avoid the positioning clasp from falling out due to the impact of the drilling fluid. In the specific implementation, the flow guide ring and the positioning clasp are both disconnected at a certain position and then clamped into the mounting clamping groove by being spread apart.

[0046] As a specific embodiment of the high-wear-resistance large-torque trenchless screw drill provided by the present application, the flow guide ring is made of alloy steel containing chromium, molybdenum, and vanadium elements.

[0047] In the embodiment, the wear resistance of the flow guide ring can be improved, the service life can be improved, and the replacement period can be prolonged.

[0048] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high abrasion resistance, high torque, non- excavating type of screw drill, characterized by, The application relates to a liquid motor assembly, universal shaft assembly and transmission shaft assembly connected in sequence. The liquid motor assembly comprises a stator and a rotor matched with the stator, the output end of the rotor comprises an extension section and a connecting section, the outer diameter of the connecting section is larger than that of the extension section, the outer periphery of the extension section is provided with a protruding flow guide part, the outer side surface of the flow guide part is a flow guide inclined surface, and the flow guide inclined surface is inclined to deviate from the central axis of the rotor in the flow direction.

2. The high abrasion resistance, high torque, non-hoie, screw drill string of claim 1, wherein, The height of the flow guide part protruding from the extension section is not more than the radius difference between the connecting section and the extension section.

3. The high abrasion resistance, high torque, non-hoie, screw drill string of claim 2, wherein, The flow guide part surrounds the connecting section to form a flow guide ring, the outer side surface of the flow guide ring is a conical surface and forms the flow guide inclined surface.

4. The high abrasion resistance, high torque, non-hoie, screw drill string of claim 3, wherein, The flow guide ring is detachably connected with the connecting section.

5. The high abrasion resistance, high torque, non-hoie, screw drill string of claim 4, wherein, The outer periphery of the extension section is provided with a mounting clamping groove, and the flow guide ring is embedded in the mounting clamping groove.

6. The high abrasion resistance, high torque, non-hoie-out-of-groove screw-in drill tool of claim 5, wherein, In the reverse flow direction, the front side surface of the flow guide ring is an outwardly convex conical surface, the front side surface of the mounting clamping groove is an inwardly concave conical surface, and the front side surface of the flow guide ring is in close contact with the front side surface of the mounting clamping groove.

7. The high abrasion resistance, high torque, non-hoie, screw drill string of claim 6, wherein, A positioning clamping ring is also embedded in the mounting clamping groove, and the positioning clamping ring is supported between the rear side surface of the flow guide ring and the rear side wall of the mounting clamping groove.

8. The high abrasion resistance, high torque, non-hoie, screw drill string of claim 3, wherein, The flow guide ring is made of alloy steel containing chromium, molybdenum and vanadium elements.

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