Bypass valve structure of screw drill

Abstract

The utility model provides a screw drill by-pass valve structure, which belongs to the technical field of screw drills and comprises a by-pass valve body and a valve seat movably arranged at the liquid outlet end of the by-pass valve body, a valve core is slidably connected in the by-pass valve body and slides relative to the valve seat, a plurality of valve holes are arranged on the outer cambered surface of the valve core, and the valve holes are communicated with the valve body. Through holes are formed in the positions, close to the valve holes, of the outer arc face of the bypass valve body, filter sleeves are arranged in the through holes, a first spring is arranged between the valve seat and the valve element, a locking mechanism used for locking the valve seat is arranged in the bypass valve body and comprises a plurality of circular sliding grooves formed in the inner arc face of the bypass valve body, and limiting columns are slidably connected into the circular sliding grooves. A plurality of limiting grooves are formed in the outer arc face of the valve seat. According to the locking mechanism, the bypass valve of the screw drill can be quickly disassembled and assembled, the maintenance difficulty of the bypass valve of the screw drill is greatly reduced, the working efficiency is greatly improved, and the stable use of the bypass valve of the screw drill is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw drill tools, and in particular relates to a bypass valve structure of a screw drill tool. Background Art

[0002] The screw drill bypass valve is a key component used in drilling operations. Its main function is to control the flow of drilling fluid during the drilling process. It is usually installed on the top of the screw drill and controls the flow of drilling fluid through the internal valve core and valve seat structure.

[0003] In the existing screw drill bypass valve, the valve seat is fixed by means of compression. Compression bolts or compression nuts are used around the valve seat. By tightening these bolts or nuts, the valve seat is tightly pressed against the corresponding position of the valve body. Some valve seats are connected to the valve body by welding. Although the valve seat can be fixed, it is very inconvenient during inspection and maintenance. The screw drill bypass valve cannot be quickly disassembled and assembled, which increases the difficulty of inspection and maintenance and reduces work efficiency. Utility Model Content

[0004] In view of this, the utility model provides a screw drill bypass valve structure, which can realize the rapid disassembly and assembly of the screw drill bypass valve through the locking mechanism, greatly reducing the difficulty of maintenance of the screw drill bypass valve, greatly improving work efficiency, and realizing locking of the valve seat, which can prevent the valve seat from shaking, making the valve seat more firm, and ensuring the stable use of the screw drill bypass valve.

[0005] In order to solve the above technical problems, the utility model provides a screw drill bypass valve structure, including a bypass valve body and a valve seat movably arranged at the liquid outlet end of the bypass valve body, a valve core is slidably connected to the bypass valve body, the valve core and the valve seat slide relatively, the outer arc surface of the valve core is provided with a plurality of valve holes, the outer arc surface of the bypass valve body is provided with a through hole near each valve hole, the through holes are provided with a filter sleeve, a spring is provided between the valve seat and the valve core, and a locking mechanism for locking the valve seat is provided in the bypass valve body, the locking mechanism includes a There are multiple circular slides, and limiting columns are slidably connected in the circular slides. The outer arc surface of the valve seat is provided with multiple limiting grooves, and the limiting columns are respectively matched with the limiting grooves adjacent to the same side. The liquid outlet end of the bypass valve body is threadedly connected with a threaded top sleeve, and the threaded top sleeve is matched with the valve seat, which realizes the rapid disassembly and assembly of the screw drill bypass valve, greatly reduces the difficulty of maintenance of the screw drill bypass valve, greatly improves work efficiency, realizes locking of the valve seat, can prevent the valve seat from shaking, makes the valve seat more firm, and ensures the stable use of the screw drill bypass valve.

[0006] The locking mechanism also includes a sealing gasket arranged outside the valve seat near the spring. The sealing gasket fits tightly with the bypass valve body, thereby ensuring the sealing performance of the bypass valve body and preventing liquid leakage.

[0007] The locking mechanism also includes a spring 2 arranged between the limiting column and the circular sliding groove where it is located, namely.

[0008] A limit ring is movably provided at the liquid outlet end of the inner arc surface of the bypass valve body. The limit ring is located between the threaded top sleeve and the valve seat, thereby locking the valve seat and ensuring the stable use of the screw drill bypass valve.

[0009] A plurality of rectangular slides are provided at the liquid outlet end of the inner arc surface of the bypass valve body, and a plurality of rectangular slides provided on the outer arc surface of the limit ring are respectively slidably connected with the adjacent rectangular slides on the same side, that is, the limit ring is limited so that it can only move axially.

[0010] The end of the limiting ring away from the threaded top sleeve is provided with multiple limiting protrusions, and the step surface of the valve seat close to the threaded top sleeve is provided with limiting grooves corresponding to the limiting protrusions one by one, so that the valve seat is more firm.

[0011] The step edge at one end of the valve seat away from the threaded top sleeve is tilted from inside to outside, which ensures smooth movement of each structure.

[0012] The beneficial effects of the above technical solution of the utility model are as follows:

[0013] 1. When inspecting the bypass valve, turn it counterclockwise and remove the threaded top sleeve. At this time, pull the valve seat outward, so that the limit post moves from the notch of the limit groove to its arc section. Then turn the valve seat clockwise to make the limit post move along the arc section of the limit groove to its axial section. At this time, the valve seat can be pulled out. During the pulling-out process, the limit post moves along the inclined surface of the axial section of the limit groove, so that the limit post overcomes the elastic force of spring 2 and retracts into the circular slide groove for avoidance. After the valve seat is pulled out, the limit post resets under the action of the rebound force of spring 2. Finally, take out spring 1, valve core and filter sleeve, which realizes the rapid disassembly and assembly of the screw drill bypass valve and greatly reduces the difficulty of repairing the screw drill bypass valve.

[0014] 2. After the inspection and maintenance is completed, reset the filter sleeve, valve core and spring 1 in turn, then match the limit groove on the valve seat with the limit post one by one, and then insert the valve seat into the bypass valve body. During this process, the limit post will contact the inclined surface of the valve seat, so that the limit post and the valve seat will slide relative to each other. At this time, the limit post will overcome the elastic force of spring 2 and retract into the circular slide groove. When the limit post moves to the limit groove, the limit post will immediately reset under the action of the rebound force of spring 2 and be inserted into the axial direction of the corresponding limit groove. The valve seat is in the inner section, and the limiting post moves to the arc section along the axial section of the limiting groove at this time. Then, the valve seat is rotated counterclockwise. After the limiting post moves to the notch of the limiting groove, it stops rotating. Then, the valve seat is pushed further, and the threaded top sleeve is finally reset. The valve seat is tightened during the tightening process of the threaded top sleeve. Then, the limiting ring cooperates with the limiting groove to lock the valve seat, ensuring the stable use of the screw drill bypass valve and greatly improving work efficiency.

[0015] 3. During the tightening process of the threaded top sleeve, the valve seat will be tightened by the limit ring, and then the limit boss on the limit ring will cooperate with the limit groove on the threaded top sleeve, and the limit ring will cooperate with the limit groove to further lock the valve seat, ensuring the stable use of the screw drill bypass valve, preventing the valve seat from shaking, and making the valve seat more firm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of a screw drill bypass valve structure of the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the utility model;

[0018] Figure 3 This is a schematic diagram of the valve seat and limit groove structure of the utility model;

[0019] Figure 4 This is an enlarged structural diagram of point A of the present invention.

[0020] Explanation of the accompanying reference numerals: 100, bypass valve body; 200, valve seat; 300, valve core; 400, valve hole; 500, through hole; 600, filter sleeve; 700, spring 1; 800, circular slide groove; 801, limiting column; 802, limiting groove; 803, threaded top sleeve; 804, spring 2; 805, sealing gasket; 900, limiting ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer, the following will be combined with the appended drawings of the embodiment of the present invention. Figure 1-4, clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention.

[0022] This embodiment provides a screw drill bypass valve structure, such as Figure 1-4 As shown: it includes a bypass valve body 100 and a valve seat 200 movably arranged at the liquid outlet end of the bypass valve body 100, a valve core 300 is slidably connected to the bypass valve body 100, the valve core 300 slides relatively with the valve seat 200, the outer arc surface of the valve core 300 is provided with a plurality of valve holes 400, the outer arc surface of the bypass valve body 100 is provided with a through hole 500 near each valve hole 400, and a filter sleeve 600 is provided in the through hole 500. A spring 700 is provided between the valve seat 200 and the valve core 300. When the drilling fluid pushes the valve core 300 to overcome the elastic force of the spring 700, the valve seat 200 and the valve core 300 slide relatively, thereby closing the valve hole 400 flowing outward, so that the thrust of the drilling fluid is concentrated on the screw drill, converting the pressure into mechanical rotational energy, driving the drill bit to drill, and when the drill is pulled out, the mud When the slurry pump stops working, the valve core 300 moves upward under the thrust of spring 1 700, opening an outward channel, so that the mud remaining in the drill tool enters the annular space through the valve hole 400 and the through hole 500, so that there is no drilling mud in the pulled-out drill tool, to avoid overflowing onto the drilling platform. A locking mechanism for locking the valve seat 200 is provided in the bypass valve body 100, and the locking mechanism includes a plurality of circular slide grooves 800 arranged on the inner arc surface of the bypass valve body 100, and the circular slide grooves 800 are all slidably connected to the limiting columns 801, and the outer arc surface of the valve seat 200 is provided with a plurality of limiting grooves 802, and the limiting columns 801 are respectively arranged in cooperation with the limiting grooves 802 adjacent to the same side. The liquid outlet end of the bypass valve body 100 is threadedly connected with a threaded top sleeve 803, and the threaded top sleeve 803 is arranged in cooperation with the valve seat 200.

[0023] When the bypass valve needs to be repaired, the threaded top sleeve 803 is rotated counterclockwise and removed. At this time, the valve seat 200 is pulled outward, so that the limiting post 801 moves out of the notch of the limiting groove 802 to its arc section. Then, the valve seat 200 is rotated clockwise to move the limiting post 801 along the arc section of the limiting groove 802 to its axial section. At this time, the valve seat 200 can be pulled out. During the pulling-out process, the limiting post 801 moves along the inclined surface of the axial section of the limiting groove 802, so that the limiting post 801 overcomes the elastic force of the spring 2 804 and retracts into the circular slide groove 800 for avoidance. After the valve seat 200 is pulled out, the limiting post 801 is reset under the action of the rebound force of the spring 2 804, and finally the spring 1 700, the valve core 300 and the filter sleeve 600 are taken out, thereby realizing the rapid disassembly and assembly of the screw drill bypass valve, greatly reducing the difficulty of repairing the screw drill bypass valve. After the repair and maintenance is completed, the filter sleeve 600, the valve core 300 and the spring 1 700 are reset in turn, and then the limiting groove 802 on the valve seat 200 is matched with the limiting post 801 one by one, and then the valve seat 200 is inserted into the bypass valve body 100. During this process, the limiting post 801 will be The inclined surface of the valve seat 200 contacts, so that the limiting post 801 slides relative to the valve seat 200. At this time, the limiting post 801 overcomes the elastic force of the spring 2 804 and retracts into the circular slide groove 800. When the limiting post 801 moves to the limiting groove 802, the limiting post 801 is immediately reset under the action of the rebound force of the spring 2 804 and inserted into the axial section of the corresponding limiting groove 802. At this time, the valve seat 200 is continued to be pushed. After the limiting post 801 moves along the axial section of the limiting groove 802 to its arc section, the valve seat 200 is rotated counterclockwise. When the limiting post 801 is moved to the arc section After moving to the notch of the limit groove 802, stop rotating, and then continue to push the valve seat 200, and finally move the limit column 801 into the notch of the limit groove 802. At this time, the threaded top sleeve 803 can be reset. During the tightening process of the threaded top sleeve 803, the valve seat 200 will be tightened by the limit ring 900, and then the limit boss on the limit ring 900 will cooperate with the limit groove on the threaded top sleeve 803 and the limit ring 900 will cooperate with the limit groove 802 to achieve locking of the valve seat 200, ensuring the stable use of the screw drill bypass valve and greatly improving work efficiency.

[0024] like Figure 2-4 As shown, the locking mechanism also includes a sealing gasket 805 arranged on the outside of the valve seat 200 near the spring 1 700. The sealing gasket 805 fits tightly with the bypass valve body 100. The use of the sealing gasket 805 ensures the sealing performance of the bypass valve body 100 and prevents liquid leakage.

[0025] like Figure 2-4 As shown, the locking mechanism also includes a second spring 804 provided between the limiting column 801 and the circular sliding groove 800 in which it is located, and the elastic characteristics of the second spring 804 are used to provide elastic support for the limiting column 801.

[0026] like Figure 1-4 As shown, a limit ring 900 is movably provided at the liquid outlet end of the inner arc surface of the bypass valve body 100. The limit ring 900 is located between the threaded top sleeve 803 and the valve seat 200. During the tightening process of the threaded top sleeve 803, the valve seat 200 is pressed tightly by the limit ring 900, thereby locking the valve seat 200 and ensuring the stable use of the screw drilling tool bypass valve.

[0027] like Figure 1-4 As shown, a plurality of rectangular grooves are provided at the liquid outlet end of the inner arc surface of the bypass valve body 100, and a plurality of rectangular slides provided on the outer arc surface of the limit ring 900 are respectively slidably connected with the adjacent rectangular slides on the same side. The sliding effect of the rectangular slides and the rectangular slides is utilized to limit the limit ring 900 so that it can only move axially.

[0028] like Figure 2-4 As shown, the end of the limiting ring 900 away from the threaded top sleeve 803 is provided with multiple limiting protrusions, and the step surface of the valve seat 200 close to the threaded top sleeve 803 is provided with limiting grooves corresponding to the limiting protrusions one by one. The limiting bosses on the limiting ring 900 fit into the limiting grooves on the threaded top sleeve 803 one by one, thereby limiting the valve seat 200, preventing the valve seat 200 from shaking, and making the valve seat 200 more secure.

[0029] like Figure 2-4 As shown, the step edge at one end of the valve seat 200 away from the threaded top sleeve 803 is tilted from the inside to the outside. During the process of inserting the valve seat 200 into the bypass valve body 100, the limit post 801 will contact the inclined surface of the valve seat 200, so that the limit post 801 and the valve seat 200 slide relative to each other. At this time, the limit post 801 overcomes the elastic force of the spring 2 804 and retracts into the circular slide groove 800, ensuring smooth movement of each structure.

[0030] The working principle of a screw drill bypass valve structure provided by the present invention is as follows: when the bypass valve needs to be inspected and repaired, the relevant staff rotates counterclockwise and removes the threaded top sleeve 803, and then removes the limit ring 900. At this time, the valve seat 200 is pulled out, so that the limit column 801 moves from the recess of the limit groove 802 to its arc section, and then the valve seat 200 is rotated clockwise to make the limit column 801 move along the arc section of the limit groove 802 to its axial section. At this time, the valve seat 200 can be pulled out. During the pulling-out process, the limit column 801 moves along the inclined surface of the axial section of the limit groove 802, so that the limit column 801 overcomes the elastic force of the spring 2 804 and retracts into the circular slide groove 800 for avoidance. After the valve seat 200 is pulled out, the limit column 801 is in After the inspection and maintenance is completed, the filter sleeve 600, the valve core 300 and the spring 1 700 are reset in sequence, and then the limiting groove 802 on the valve seat 200 is matched with the limiting post 801 one by one, and then the valve seat 200 is inserted into the bypass valve body 100. During this process, the limiting post 801 will contact the inclined surface of the valve seat 200, so that the limiting post 801 and the valve seat 200 slide relative to each other. At this time, the limiting post 801 overcomes the elastic force of the spring 2 804 and retracts into the circular slide groove 800. When the limiting post 801 moves to the limiting groove 80 2, the limiting post 801 is immediately reset under the action of the rebound force of the spring 2 804 and inserted into the axial section of the corresponding limiting groove 802. At this time, the valve seat 200 is continued to be pushed. After the limiting post 801 moves along the axial section of the limiting groove 802 to its arc section, the valve seat 200 is rotated counterclockwise. After the limiting post 801 moves to the notch of the limiting groove 802, it stops rotating, and then the valve seat 200 is continued to be pushed, and finally the limiting post 801 is moved to the notch of the limiting groove 802. At this time, the rectangular slide on the limiting ring 900 is matched with the rectangular slide, and then the limiting ring 900 is pushed into the bypass valve body 100. The limiting boss on the limiting ring 900 is matched with the limiting groove on the threaded top sleeve 803 one by one. At this time, the threaded top sleeve 803 can be reset. When the threaded top sleeve 803 is tightened, the valve seat 200 will be pressed by the limiting ring 900, and then the limiting boss on the limiting ring 900 cooperates with the limiting groove on the threaded top sleeve 803, and the limiting ring 900 cooperates with the limiting groove 802 to lock the valve seat 200, ensuring the stable use of the screw drill bypass valve and greatly improving the working efficiency. When the drilling fluid pushes the valve core 300 to overcome the elastic force of the spring 700, the valve seat 200 and the valve core 300 slide relative to each other, thereby closing the valve hole 400 flowing outward, so that the thrust of the drilling fluid is concentrated on the screw drill, converting the pressure into mechanical rotational energy, and driving the drill bit to drill. When drilling, the mud pump stops working, and the valve core 300 moves upward under the thrust of the spring 700, opening the outward channel.The mud remaining in the drill string is allowed to enter the annular space through the valve hole 400 and the through hole 500, so that there is no drilling mud in the drill string after it is pulled out, thus preventing it from overflowing onto the drilling platform. The filter sleeve 600 plays a filtering role, and the use of the sealing gasket 805 ensures the sealing performance of the bypass valve body 100 and prevents liquid leakage.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A screw drill bypass valve structure, characterized by: The invention comprises a bypass valve body (100) and a valve seat (200) movably arranged at the liquid outlet end of the bypass valve body (100), wherein a valve core (300) is slidably connected in the bypass valve body (100), wherein the valve core (300) and the valve seat (200) slide relative to each other, wherein the outer arc surface of the valve core (300) is provided with a plurality of valve holes (400), wherein the outer arc surface of the bypass valve body (100) is provided with a through hole (500) near each valve hole (400), wherein a filter sleeve (600) is provided in each through hole (500), wherein a spring (700) is provided between the valve seat (200) and the valve core (300), wherein the bypass valve body (100) is provided with a plurality of valve holes (400), wherein the outer arc surface of the bypass valve body (100) is provided with a through hole (500) near each valve hole (400), wherein the filter sleeve (600) is provided in each through hole (500), wherein the ... A locking mechanism for locking the valve seat (200) is provided in the valve body (100), and the locking mechanism includes a plurality of circular slide grooves (800) provided on the inner arc surface of the bypass valve body (100), and the circular slide grooves (800) are all slidably connected with limiting columns (801), and the outer arc surface of the valve seat (200) is provided with a plurality of limiting grooves (802), and the limiting columns (801) are respectively arranged in cooperation with the limiting grooves (802) adjacent to the same side. The liquid outlet end of the bypass valve body (100) is threadedly connected with a threaded top sleeve (803), and the threaded top sleeve (803) is arranged in cooperation with the valve seat (200).

2. A screw drill bypass valve structure according to claim 1, characterized in that: The locking mechanism further includes a sealing gasket (805) arranged outside the valve seat (200) near the spring 1 (700), and the sealing gasket (805) is tightly fitted with the bypass valve body (100).

3. The screw drill bypass valve structure according to claim 1, characterized in that: The locking mechanism also includes a second spring (804) arranged between the limiting column (801) and the circular sliding groove (800) in which it is located.

4. The screw drill bypass valve structure according to claim 1, characterized in that: A limit ring (900) is movably provided at the liquid outlet end of the inner arc surface of the bypass valve body (100), and the limit ring (900) is located between the threaded top sleeve (803) and the valve seat (200).

5. The screw drill bypass valve structure according to claim 4, characterized in that: A plurality of rectangular slides are provided at the liquid outlet end of the inner arc surface of the bypass valve body (100), and a plurality of rectangular slides provided on the outer arc surface of the limit ring (900) are respectively slidably connected to the adjacent rectangular slides on the same side.

6. The screw drill bypass valve structure according to claim 4, characterized in that: The limiting ring (900) is provided with a plurality of limiting protrusions at one end away from the threaded top sleeve (803), and the valve seat (200) is provided with limiting grooves corresponding to the limiting protrusions on a step surface at one end close to the threaded top sleeve (803).

7. The screw drill bypass valve structure according to claim 1, characterized in that: The step edge of one end of the valve seat (200) away from the threaded top sleeve (803) is tilted from the inside to the outside.

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