Screw for well drilling

Abstract

The utility model provides a screw for well drilling, and belongs to the field of drilling equipment. The screw for well drilling comprises a bypass valve section, an anti-disengaging section, a motor section, a universal shaft section and a transmission shaft section which are sequentially arranged. The anti-falling section comprises an anti-falling shell and an anti-falling rod. One end of the anti-shelling shell is connected with the bypass valve section, and the other end is connected with the motor section; a limiting ring is arranged on the inner circumferential wall of the anti-falling shell, and a plurality of notches distributed in the circumferential direction are formed in the inner wall of the limiting ring. One end of the anti-disengaging rod is connected with the motor section, the other end of the anti-disengaging rod penetrates through the limiting ring and is provided with a limiting head, the limiting head comprises a plurality of clamping jaws distributed in the circumferential direction, and a flow guide groove is formed between every two adjacent clamping jaws; the number of the clamping jaws is smaller than that of the notches, and the notches do not allow the clamping jaws to pass through. Fluid flows through the limiting head through the diversion trench; as the number of the clamping jaws is smaller than that of the notches, the clamping jaws cannot block all the notches, and fluid can flow through the notches which are not blocked; the resistance of the fluid passing through the anti-falling section is greatly reduced, the pressure loss is reduced, and the system efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of drilling equipment, and more specifically, to a drilling screw. Background Art

[0002] Screw drilling tools are commonly used in geotechnical engineering. During the drilling process, the screw may become loose or broken due to severe vibration, which may lead to a fall-off accident. Therefore, an anti-fall-off structure is usually designed in the screw.

[0003] The anti-dropping structure of the current screw usually consists of an anti-dropping rod and an anti-dropping shell. When the screw falls off, a section of the anti-dropping rod is limited in the anti-dropping shell to prevent the screw from falling. Although this structure can achieve the anti-dropping function, it has a large resistance to the fluid flowing through the anti-dropping structure, which reduces the drilling efficiency. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a drilling screw to solve the technical problem of fluid resistance of the anti-slip structure in the prior art and reduced drilling efficiency.

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

[0006] On the one hand, a drilling screw is provided, comprising: a bypass valve section, an anti-slip section, a motor section, a universal shaft section and a transmission shaft section arranged in sequence; wherein the anti-slip section comprises:

[0007] An anti-shell, one end of which is connected to the bypass valve section, and the other end is connected to the motor section; a limiting ring is provided on the inner peripheral wall of the anti-shell, a part of the inner cavity of the limiting ring protrudes radially outward to form a notch on the inner wall of the limiting ring, and a plurality of notches distributed along the circumferential direction are formed on the inner wall of the limiting ring, and each of the notches is connected in the axial direction;

[0008] An anti-drop rod, one end of which is connected to the motor section, and the other end of which passes through the limiting ring and is provided with a limiting head, wherein the limiting head includes a plurality of claws distributed along the circumferential direction, and a guide groove is formed between adjacent claws;

[0009] The number of the claws is less than the number of the slots, and the slots do not allow the claws to pass through.

[0010] In some embodiments, the circumferential thickness of the claw gradually increases in the axial direction from the anti-slip section to the motor section.

[0011] In some embodiments, the inner diameter of the limiting ring is less than or equal to one half of the inner diameter of the anti-shelling shell.

[0012] In certain embodiments, one end of the claw facing the bypass valve section is arc-shaped, and the side close to the central axis is the highest point closest to the bypass valve section.

[0013] In some embodiments, end surfaces of the claws facing one end of the bypass valve section are cospherical.

[0014] In some embodiments, the number of the claws is no more than five, and the number of the slots is one more than the number of the claws.

[0015] In some embodiments, the number of the claws is three, and the number of the slots is four.

[0016] The beneficial effect of the drilling screw provided in the embodiment of the present application is that compared with the prior art, in the drilling screw in the embodiment of the present application, when the fluid passes through the anti-slip section, the fluid flows through the guide groove between the claws when flowing through the limit head; when the fluid flows through the limit ring, since the number of claws is less than the number of slots, the claws will not block all the slots, so the fluid can flow through the unblocked slots; through the above, the resistance of the fluid passing through the anti-slip section is greatly reduced, the pressure loss is reduced, and the system efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A partial cross-sectional view of a drilling screw provided in an embodiment of the present application;

[0019] Figure 2 for Figure 1 Top view of the middle jaw;

[0020] Figure 3 for Figure 1 A top view of the middle limit ring;

[0021] Figure 4 for Figure 2 The claws and Figure 3 A top view of the mating state of the limit ring.

[0022] Among them, the reference numerals in the figure are:

[0023] 1-Bypass valve section; 2-Anti-slip section; 21-Anti-shell slip; 22-Limiting ring; 221-Notch; 23-Anti-slip rod; 24-Claw; 25-Guide groove; 3-Motor section; 4-Universal shaft section; 5-Transmission shaft section. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] Please also read Figures 1 to 4 The drilling screw provided by the embodiment of the present application is now described. A drilling screw comprises: a bypass valve section, an anti-slip section, a motor section, a universal shaft section and a transmission shaft section arranged in sequence; wherein the anti-slip section comprises: an anti-slip shell and an anti-slip rod.

[0029] One end of the anti-shell is connected to the bypass valve section, and the other end is connected to the motor section; a limiting ring is provided on the inner circumferential wall of the anti-shell, and a part of the inner cavity of the limiting ring protrudes radially outward to form a groove on the inner wall of the limiting ring. The inner wall of the limiting ring is formed with multiple grooves distributed along the circumferential direction, and each groove is connected in the axial direction.

[0030] One end of the anti-drop rod is connected to the motor section, and the other end passes through the limit ring and is provided with a limit head. The limit head includes a plurality of claws distributed along the circumferential direction, and a guide groove is formed between adjacent claws.

[0031] The number of the claws is less than the number of the slots, and the slots do not allow the claws to pass through.

[0032] Compared with the prior art, in the drilling screw of the embodiment of the present application, when the fluid passes through the anti-slip section, the fluid flows through the guide groove between the claws when flowing through the limit head; when the fluid flows through the limit ring, since the number of claws is less than the number of slots, the claws will not block all the slots, and the fluid can flow through the unblocked slots; the above greatly reduces the resistance of the fluid passing through the anti-slip section, reduces the pressure loss, and improves the system efficiency.

[0033] In this embodiment, during normal operation, mud flows into the bypass valve section. When the mud pressure reaches the set value, the bypass valve section opens, allowing the mud to enter the subsequent anti-slip section; when the mud pressure is less than the set value (such as when drilling), the bypass valve section discharges the mud to the surroundings. The motor section is a screw motor. After the mud flowing through the anti-slip section enters the motor section, the single screw rotor in the motor section converts the pressure of the mud into rotational power. The power of the single screw rotor in the motor section is transmitted to the transmission shaft section through the universal shaft section, and the transmission shaft section then transmits the power to the drill bit; wherein the universal shaft section converts the planetary motion of the motor section into the fixed-axis rotation of the transmission shaft section. The bypass valve section, motor section, universal shaft section and transmission shaft section can all adopt conventional structures on the market, which will not be emphasized here.

[0034] In a specific implementation, the anti-stripping shell is a cylindrical shell, one end of which is connected to the outer shell of the bypass valve section, and the other end is connected to the outer shell of the motor section. A limit ring is fixed to the inner wall of the anti-stripping shell, and a limit head is arranged after one end of the anti-stripping rod passes through the limit ring. When the motor section is disconnected from the anti-stripping shell, the anti-stripping rod is clamped in the limit ring through the limit head, thereby preventing the motor section from falling directly.

[0035] The limit head is composed of claws distributed along the circumference and fixed to each other, and the guide grooves between adjacent claws can facilitate the mud to flow through the limit head along the axial direction. A plurality of notches are set on the inner wall of the limit ring. By designing the shape, size and other parameters of the notches, the claws cannot pass through the notches, so that even if the claws are opposite to the notches, the claws can be limited by the limit ring to avoid the anti-slip rod and the anti-slip shell from separating after the motor section falls off, and failing to play the anti-slip effect. The number of claws is less than the number of notches, so that at least one notch will not be blocked by the claws, and the mud can pass through the notch.

[0036] See also Figure 1 As a specific embodiment of the drilling screw provided in the present application, the circumferential thickness of the claw gradually increases in the axial direction from the anti-slip section to the motor section.

[0037] In this embodiment, the strength of the claws is ensured and mud can pass smoothly.

[0038] In a specific implementation, in the axial direction from the anti-slip section to the motor section, the circumferential thickness of the claw gradually decreases and increases, so that the circumferential thickness of the formed guide groove gradually decreases.

[0039] See also Figure 3 As a specific implementation of the drilling screw provided in the present application, the inner diameter of the limiting ring is less than or equal to half of the inner diameter of the anti-shelling.

[0040] In this embodiment, since part of the mud flows through the notch, the inner diameter of the limit ring can be set smaller to improve the strength of the limit ring, without worrying about the annular gap between the anti-slip rod and the inner wall of the limit ring being too small. More specifically, the difference between the outer diameter of the anti-slip rod and the inner diameter of the limit ring is less than 4 cm, and the depth of the notch in the radial direction toward the limit ring is greater than 4 cm.

[0041] See also Figure 1 As a specific embodiment of the drilling screw provided by the present application, the end of the claw facing the bypass valve section is arc-shaped, and the side close to the central axis is the highest point closest to the bypass valve section, further reducing the resistance of the claw to the mud coming from the bypass valve section.

[0042] See also Figure 1 As a specific embodiment of the drilling screw provided in the present application, the end faces of each claw facing one end of the bypass valve section are cospherical.

[0043] In a specific implementation, each claw is an integrated structure, and one end of a cylindrical steel material is processed into a spherical surface, and then a plurality of guide grooves are processed to form a limit head.

[0044] See also Figures 2 to 4 As a specific embodiment of the drilling screw provided in the present application, the number of the claws is no more than five, and the number of the slots is one more than the number of the claws.

[0045] See also Figures 2 to 4 As a specific embodiment of the drilling screw provided by the present application, the number of the claws is three and the number of the slots is four. It is easy to process and can also reduce the resistance of the mud.

[0046] 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. A drilling screw, characterized in that: include: A bypass valve section, an anti-slip section, a motor section, a universal shaft section and a transmission shaft section are arranged in sequence; wherein the anti-slip section includes: An anti-shell, one end of which is connected to the bypass valve section, and the other end is connected to the motor section; a limiting ring is provided on the inner peripheral wall of the anti-shell, a part of the inner cavity of the limiting ring protrudes radially outward to form a notch on the inner wall of the limiting ring, and a plurality of notches distributed along the circumferential direction are formed on the inner wall of the limiting ring, and each of the notches is connected in the axial direction; An anti-drop rod, one end of which is connected to the motor section, and the other end of which passes through the limiting ring and is provided with a limiting head, wherein the limiting head includes a plurality of claws distributed along the circumferential direction, and a guide groove is formed between adjacent claws; The number of the claws is less than the number of the slots, and the slots do not allow the claws to pass through.

2. The drilling screw according to claim 1, characterized in that: In the axial direction from the anti-slip section to the motor section, the circumferential thickness of the claw gradually increases.

3. The drilling screw according to claim 1, characterized in that: The inner diameter of the limiting ring is less than or equal to one half of the inner diameter of the anti-shelling.

4. The drilling screw according to claim 1, characterized in that: One end of the claw facing the bypass valve section is arc-shaped, and the side close to the central axis is the highest point closest to the bypass valve section.

5. The drilling screw according to claim 4, characterized in that: The end surfaces of the claws facing one end of the bypass valve section are cospherical.

6. The drilling screw according to claim 1, characterized in that: The number of the claws is no more than five, and the number of the slots is one more than the number of the claws.

7. The drilling screw according to claim 6, characterized in that: The number of the claws is three, and the number of the slots is four.

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