Rotary check valve

Abstract

The utility model relates to the technical field of check valves, and provides a rotary check valve which comprises an upper valve seat, a lower valve seat and a valve element, the upper valve seat is connected with the lower valve seat, and the valve element is arranged between the upper valve seat and the lower valve seat. A first flow channel is formed in the middle of the valve element, a second flow channel communicated with the first flow channel is formed in the outer edge of the top end of the valve element, a first step structure is arranged at the bottom of the valve element, and a through hole penetrating through the first step structure is formed in the valve element; a check block is arranged on the inner side of the upper valve seat and makes contact with the top end of the valve element. The lower valve seat is provided with a second step structure matched with the first step structure, a rotary cavity is reserved between the first step structure and the second step structure, and drilling fluid enters the rotary cavity to drive the valve element to rotate. According to the utility model, rotation dislocation is realized to prevent drilling fluid from flowing back, and collision and vibration wear are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, and more specifically, to a rotary check valve. Background Art

[0002] During the drilling operation on a drilling platform, high-pressure formation fluids are often encountered during the drilling process. A reliable blowout prevention system can ensure the safety and efficiency of the drilling operation. A check valve is a valve that allows only unidirectional flow. Usually, this valve operates automatically. Under the fluid pressure in one direction, the valve opens automatically, and when the fluid flows in the reverse direction, it drives the valve to close, thus achieving unidirectional flow.

[0003] The rotary check valve is a blowout prevention tool installed in the drill pipe. When encountering high-pressure oil and gas formation fluids pressing upwards, it can drive the valve core to rotate to close the flow channel and prevent blowout or well kick. However, the existing conventional ball check valve uses a combination of a ball and a spring, and this method has a large impact, which easily causes collisions or vibration wear between the ball, the spring, and the inner wall of the lower joint. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a rotary check valve to improve durability and eliminate elastic collisions and vibration wear of objects.

[0005] The embodiment of the utility model is realized by the following technical solutions: A rotary check valve includes an upper valve seat, a lower valve seat, and a valve core. The upper valve seat is connected to the lower valve seat, and the valve core is arranged between the upper valve seat and the lower valve seat. A first flow channel is provided in the middle of the valve core. A second flow channel communicating with the first flow channel is provided at the outer edge of the top end of the valve core. A first step structure is provided at the bottom of the valve core, and a through hole penetrating to the first step structure is provided on the valve core. A stop block is provided on the inner side of the upper valve seat, and the stop block is in contact with the top end of the valve core. The lower valve seat is provided with a second step structure adapted to the first step structure, and a rotary cavity is left between the first step structure and the second step structure. The drilling fluid entering the rotary cavity can drive the valve core to rotate.

[0006] Preferably, the first step structure includes a step side a and a step side b, and the step side a is adjacent to the through hole. The second step structure includes a step boss A, a step boss B, and a step boss C. A first liquid inlet cavity is formed between the step side a and the step boss A and the step boss B, and a second liquid inlet cavity is formed between the step side b and the step boss C.

[0007] Preferably, a protruding cylinder is provided at the top end of the valve core, the second flow channel extends radially along the protruding cylinder, and the protruding cylinder is correspondingly adapted to the stop block.

[0008] Preferably, both ends of the second flow channel penetrate through the protruding cylinder, and the second flow channel is perpendicular to the first flow channel.

[0009] Preferably, the outer diameters of the upper valve seat and the lower valve seat are equal; the upper valve seat and the lower valve seat are detachably connected by threads.

[0010] Preferably, two stoppers are arranged at equal intervals around the inner wall of the upper valve seat, and the stoppers are arc-shaped structures.

[0011] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: Compared with the prior art, when the present invention is in reflux, the drilling fluid will enter the rotary cavity to drive the valve core to rotate. The liquid inlet of the second flow channel turns to the stopper and is blocked, so that it cannot reflux. The normal flow direction of the drilling fluid can push the valve core to reset and rotate again through the through hole, realizing non-collision check, with less wear and longer service life. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0013] Figure 1 Structural schematic diagram of the rotary check valve provided for the embodiment of the present invention;

[0014] Figure 2 For Figure 1 Structural schematic diagram in the A direction of

[0015] Figure 3 For Figure 1 Cross-sectional view taken along line B-B of

[0016] Figure 4 Structural schematic diagram of the valve core in the present invention;

[0017] Figure 5 Bottom view of the valve core in the present invention;

[0018] Figure 6 Top view of the upper valve seat in the present invention;

[0019] Figure 7 Cross-sectional view of the upper valve seat;

[0020] Figure 8 Top view of the lower valve seat in the present invention;

[0021] Figure 9 The Figure 8 cross-sectional view at the C-C position in

[0022] Icon: 1 - upper valve seat, 11 - stopper, 2 - lower valve seat, 21 - second step structure, 211 - step boss A, 212 - step boss B, 213 - step boss C, 3 - valve core, 31 - first flow channel, 32 - protruding cylinder, 321 - second flow channel, 33 - through hole, 34 - first step structure, 341 - step side a, 342 - step side b. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] Embodiment

[0027] The following is further described in conjunction with specific embodiments. Refer to Figures 1-9As shown in the figure, this embodiment is a rotary check valve, which includes an upper valve seat 1, a lower valve seat 2 and a valve core 3. The upper valve seat 1 is connected to the lower valve seat 2, and the valve core 3 is arranged between the upper valve seat 1 and the lower valve seat 2. A first flow channel 31 is provided in the middle of the valve core 3, a second flow channel 321 communicating with the first flow channel 31 is provided on the outer edge of the top end of the valve core 3, a first step structure 34 is provided at the bottom of the valve core 3, and a through hole 33 penetrating through the first step structure 34 is provided on the valve core 3. A stopper 11 is provided on the inner side of the upper valve seat 1, and the stopper 11 is in contact with the top end of the valve core 3. The lower valve seat 2 is provided with a second step structure 21 adapted to the first step structure 34, and a rotary cavity is left between the first step structure 34 and the second step structure 21. The drilling fluid entering the rotary cavity can drive the valve core 3 to rotate. Specifically, when the check valve is working, the upper valve seat 1 communicates with the lower valve seat 2, and the valve core 3 is stuck between the upper valve seat 1 and the lower valve seat 2. The drilling fluid can normally flow in from the upper valve seat 1, flow out through the second flow channel 321 and the first flow channel 31, and then flow out from the lower valve seat 2. As Figure 2 and Figure 3 shown, when the drilling fluid flows back, the drilling fluid will enter the rotary cavity and drive the valve core 3 to rotate by a certain angle, so that the second flow channel 321 turns to be closely attached to the inner wall of the stopper 11, so that the drilling fluid cannot flow back from the second flow channel 321. When the backflow disappears, the drilling fluid can normally continue to input the drilling fluid from the through hole 33 into the rotary cavity to drive the valve core 3 to rotate back to its original position, so that the second flow channel 321 can pass the fluid normally. This method has no collision, less wear and long service life.

[0028] Referring to Figure 3 、 Figure 5 and Figure 8 shown, the first step structure 34 in this embodiment includes a step side a341 and a step side b342. The step side a341 is close to the through hole 33. The second step structure 21 includes a step boss A211, a step boss B212 and a step boss C213. A first liquid inlet cavity is formed between the step side a341 and the step bosses A211 and B212, and a second liquid inlet cavity is formed between the step side b342 and the step boss C213. Specifically, a part of the middle of the first step structure 34 is a disc, so that the valve core 3 can have a certain ability to rotate around the axis. When the drilling fluid flows back, the drilling fluid flows into the second liquid inlet cavity formed by the step boss C213 and the step side b342 of the valve core 3, driving the valve core 3 to rotate 90°. The stopper 11 blocks the inlet of the second flow channel 321, and the drilling fluid cannot flow back, while the through hole 33 moves out from below the stopper 11. When the backflow stops and the drilling fluid flows unidirectionally normally, the drilling fluid first flows from the through hole 33 to the bottom end of the valve core 3. The drilling fluid enters the first liquid inlet cavity to make the valve core 3 rotate back, the second flow channel 321 is reopened, and the through hole 33 returns below the stopper 11 again.

[0029] As described above, both the first liquid inlet cavity and the second liquid inlet cavity are rotary cavities.

[0030] As Figure 4 shown, a protruding cylinder 32 is provided at the top of the valve core 3 in this embodiment. The second flow channel 321 extends radially along the protruding cylinder 32, and the protruding cylinder 32 is correspondingly adapted to the stopper 11. Specifically, the stopper 11 surrounds the protruding cylinder 32.

[0031] In addition, in order to ensure the smoothness of the second flow channel 321, both ends of the second flow channel 321 penetrate through the protruding cylinder 32, and the second flow channel 321 is perpendicular to the first flow channel 31.

[0032] For the convenience of assembly and to facilitate the placement of the upper valve seat 1 and the lower valve seat 2 into the well, the outer diameters of the upper valve seat 1 and the lower valve seat 2 are equal. The upper valve seat 1 and the lower valve seat 2 are connected in a threaded detachable manner. The lower end of the upper valve seat 1 uses a tapered thread, and the upper end of the lower valve seat 2 is an internal tapered hole thread.

[0033] As Figure 6 shown, two stoppers 11 in this embodiment are arranged evenly spaced around the inner wall of the upper valve seat 1, and the stopper 11 is an arc-shaped structure. Specifically, since both ends of the second flow channel 321 are communicated, in order to block both ends of the second flow channel 321 to avoid backflow, this symmetrical structure is set.

[0034] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary check valve, characterized in that: It comprises an upper valve seat (1), a lower valve seat (2) and a valve core (3), wherein the upper valve seat (1) is connected to the lower valve seat (2), and the valve core (3) is arranged between the upper valve seat (1) and the lower valve seat (2); A first flow channel (31) is provided in the middle of the valve core (3), a second flow channel (321) communicating with the first flow channel (31) is provided at the outer edge of the top end of the valve core (3), a first step structure (34) is provided at the bottom of the valve core (3), and a through hole (33) penetrating to the first step structure (34) is provided on the valve core (3); A stopper (11) is provided on the inner side of the upper valve seat (1), and the stopper (11) is in contact with the top end of the valve core (3); The lower valve seat (2) is provided with a second step structure (21) adapted to the first step structure (34), and a rotation cavity is reserved between the first step structure (34) and the second step structure (21), and drilling fluid entering the rotation cavity can drive the valve core (3) to rotate.

2. The rotary check valve according to claim 1, characterized in that: The first step structure (34) comprises a step side surface a (341) and a step side surface b (342), wherein the step side surface a (341) is adjacent to the through hole (33); The second step structure (21) includes a step boss A (211), a step boss B (212) and a step boss C (213); a first liquid inlet cavity is formed between the step side a (341) and the step boss A (211) and the step boss B (212); and a second liquid inlet cavity is formed between the step side b (342) and the step boss C (213).

3. The rotary check valve according to claim 1, characterized in that: A protruding column (32) is provided at the top end of the valve core (3), the second flow channel (321) extends radially along the protruding column (32), and the protruding column (32) is adapted to correspond to the stopper (11).

4. The rotary check valve according to claim 3, characterized in that: Both ends of the second flow channel (321) pass through the protruding column (32), and the second flow channel (321) and the first flow channel (31) remain perpendicular.

5. The rotary check valve according to claim 1, characterized in that: The outer diameters of the upper valve seat (1) and the lower valve seat (2) are equal.

6. The rotary check valve according to claim 5, characterized in that: The upper valve seat (1) and the lower valve seat (2) are connected in a threaded detachable manner.

7. The rotary check valve according to claim 1, characterized in that: The stopper (11) is provided with two inner walls surrounding the upper valve seat (1) and arranged evenly at intervals, and the stopper (11) is an arc-shaped structure.

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