Rotary check valve

Abstract

The utility model relates to the technical field of check valves, and provides a rotary check valve which comprises a valve body and a valve element, and the valve element is arranged in the valve body and rotationally connected with the valve body. A flow channel communicated with the lower end of the valve body is arranged on the inner wall of the valve element, and the flow channel is of an inclined hole structure. The locking sliding block and the spring are installed in the inner wall of the valve body in an embedded mode and correspondingly matched with the flow channel, and the locking sliding block and the spring are clamped between the valve element and the inner wall of the valve body in an extruded mode; the valve element rotates to drive the flow channel to move to the locking sliding block to be blocked. According to the utility model, the valve core is driven to rotate through drilling fluid backflushing to block the flow channel to realize backflushing prevention, the sealing effect is good, the possibility of washout failure is low, and the service life is long.

Description

Technical Field

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

[0002] During the drilling process, there may be reverse flow in the high-pressure oil and gas layer. This reverse flow will not only reduce work efficiency, but also may cause leakage, environmental pollution and accidents. The lack of a reliable blowout prevention system may lead to well kicks or blowouts, seriously affecting the safety and efficiency of drilling operations. The main function of the downhole check valve is to prevent the reverse flow of high-pressure oil and gas from the well, thereby protecting the safety of wellhead equipment and operators. Its working principle is based on the opening and closing mechanism of the valve. When a blowout occurs, the valve will be closed due to pressure difference, magnetic force and other reasons. Thereby preventing the occurrence of blowouts.

[0003] Existing check valves usually use steel balls to plug the orifices to achieve the anti-blowout effect. This causes the steel balls to be eroded by the high-speed flowing drilling fluid, causing the steel balls to be eroded and damaged, the plugging effect to deteriorate, and part of the drilling fluid will still flow out in the opposite direction, eventually causing the check valve to fail. Utility Model Content

[0004] The utility model aims to provide a rotary check valve which has a long-term liquid-proof recoil-proof effect and a long service life.

[0005] The embodiment of the utility model is realized through the following technical scheme: a rotary check valve, comprising a valve body and a valve core, wherein the valve core is arranged in the valve body and rotatably connected thereto; the inner wall of the valve core is provided with a flow channel communicating with the lower end of the valve body, and the flow channel is an inclined hole structure; a locking slider and a spring are embedded and installed in the inner wall of the valve body and cooperate with the flow channel, and the locking slider and the spring are squeezed and stuck between the valve core and the inner wall of the valve body; the rotation of the valve core drives the flow channel to move to the locking slider to block it.

[0006] Furthermore, it also includes an upper bearing seat and a lower bearing seat which are sequentially installed in the valve body, and the upper bearing seat and the lower bearing seat are respectively arranged at the upper and lower ends of the valve core.

[0007] Furthermore, it also includes a valve seat installed in the valve body, the valve seat is arranged at the lower end of the valve core and abuts against it, and the valve seat has at least one flow hole.

[0008] Furthermore, a sealing ring is sleeved on the outer surface of the valve seat.

[0009] Furthermore, it also includes a lower joint, which is detachably connected to the valve body, and the top end of the lower joint abuts against the lower end of the valve seat.

[0010] Furthermore, the flow channels are provided with at least two and are symmetrical around the center of the valve core.

[0011] Furthermore, a guide ring groove is provided on the outer surface of the valve core, and a limiting protrusion is provided in the guide ring groove; a pin is fixedly installed on the inner wall of the valve body, and one end of the pin is stuck in the guide ring groove.

[0012] Furthermore, the guide ring groove is arranged at the lower side of the flow channel.

[0013] Furthermore, the lower end of the valve core is a cone head structure.

[0014] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects: compared with the prior art, the utility model drives the valve core to rotate when the liquid passes through by setting the flow channel with an inclined hole structure, and when it turns to a certain position, the flow channel is blocked, thereby achieving the anti-spraying effect, and the required hydraulic pressure is relatively small;

[0015] The friction and wear during operation are relatively small, it is not easily eroded, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of the rotary check valve provided by the embodiment of the utility model in a flow state;

[0018] Figure 2 It is a schematic diagram of the position of the slider in the structure of the check valve of the utility model when it is in a flow state;

[0019] Figure 3 for Figure 2 A schematic cross-sectional view of the locking slider in FIG.

[0020] Figure 4 for Figure 2 A local enlarged view of point A in FIG.

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the valve core in the utility model;

[0022] Figure 6 for Figure 1 Schematic diagram of the position of the pins in .

[0023] Icon: 1-valve body, 2-upper bearing seat, 3-valve core, 31-flow channel, 32-guide ring groove, 321-limiting protrusion, 4-lower bearing seat, 5-valve seat, 52-flow hole, 51-sealing ring, 6-lower joint, 7-locking slider, 8-spring, 9-pin. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] Example

[0028] The following is further described in conjunction with specific embodiments. Figure 1-Figure 6 As shown, this embodiment is a rotary check valve, including a valve body 1 and a valve core 3, the valve core 3 is arranged in the valve body 1 and is rotatably connected thereto; the inner wall of the valve core 3 is provided with a flow channel 31 which is communicated with the lower end of the valve body 1, and the flow channel 31 is an inclined hole structure; a locking slider 7 and a spring 8 are embedded and installed in the inner wall of the valve body 1 and are matched with the flow channel 31, and the locking slider 7 and the spring 8 are squeezed and stuck between the valve core 3 and the inner wall of the valve body 1; the rotation of the valve core 3 drives the flow channel 31 to move to the locking slider 7 to block it; specifically, during normal drilling circulation, the drilling fluid enters the valve core 3 through the valve body 1, and passes through the The only flow channel 31 flows out of the valve core 3 and flows out from the lower end of the valve body 1. When the drilling fluid flows out through the flow channel 31, the valve core 3 will rotate to a certain position and stop due to the inclined hole structure of the flow channel 31 and the impact of the hydraulic pressure. When a blowout occurs, the drilling fluid passes through the flow channel 31. At this time, the drilling fluid flows from the outside of the valve core 3 to the inside. Due to the effect of the hydraulic pressure, the valve core 3 rotates counterclockwise. When the valve core 3 rotates counterclockwise, when the only flow channel 31 turns to the same line as the locking slider 7, the locking slider 7 blocks the only flow channel 31 due to the elastic force of the spring 8, thereby achieving the effect of non-return and anti-blowout.

[0029] Compared with the traditional check valve, the check valve can rotate the valve core 3 with less hydraulic pressure, thereby achieving the effect of preventing blowout. It adopts the principle of rotation to achieve blowout prevention. Compared with the traditional check valve with the valve core 3 moving up and down, the friction and wear of the rotating check valve during operation are relatively small, so it has a longer service life.

[0030] like Figure 1 As described, in order to ensure that the valve core 3 rotates normally and smoothly to block the flow channel 31, the present embodiment also includes an upper bearing seat 2 and a lower bearing seat 4 which are sequentially installed in the valve body 1, and the upper bearing seat 2 and the lower bearing seat 4 are respectively arranged at the upper and lower ends of the valve core 3; specifically, the upper and lower ends of the valve core 3 are provided with steps for inserting bearings for use.

[0031] like Figure 1 and Figure 2 As shown, this embodiment also includes a valve seat 5 installed in the valve body 1. The valve seat 5 is arranged at the lower end of the valve core 3 and abuts against it. The valve seat 5 has at least one flow hole 52. Specifically, after the drilling fluid flows out of the flow channel 31 of the valve core 3, it flows to the flow hole 52 of the valve seat 5 and is discharged from the valve body 1.

[0032] In order to improve the sealing performance between the valve seat 5 and the inner wall of the valve body 1 and prevent the drilling fluid from leaking along the wall, a sealing ring 51 is sleeved on the outer surface of the valve seat 5 .

[0033] like Figure 2 As shown, the present embodiment further includes a lower joint 6, which is detachably connected to the valve body 1, and the top end of the lower joint 6 abuts against the lower end of the valve seat 5; specifically, in order to facilitate assembly, the upper bearing seat 2, the lower bearing seat 4, the locking slider 7, the spring 8, the valve seat 5 and the valve core 3 are first installed into the valve body 1, and then the lower end of the valve body 1 is sealed using the lower joint 6.

[0034] like Figure 3 As shown, in this embodiment, at least two flow channels 31 are provided and are symmetrical around the center of the valve core 3; specifically, when the drilling fluid enters and exits the flow channel 31, the two sides symmetrically and evenly generate power to drive the valve core 3 to rotate.

[0035] like Figure 5 and Figure 6As shown, a guide ring groove 32 is provided on the outer surface of the valve core 3, and a limiting protrusion 321 is provided in the guide ring groove 32; a pin 9 is fixedly installed on the inner wall of the valve body 1, and one end of the pin 9 is stuck in the guide ring groove 32; the guide ring groove 32 is arranged on the lower side of the flow channel 31; specifically, when the drilling fluid flows out of the flow channel 31 in the positive direction, it will drive the valve core 3 to rotate clockwise, and when the pin 9 rotates to the limiting protrusion 321, it is stuck, the valve core 3 no longer rotates, and the flow channel 31 can pass the fluid normally. At this time, the locking slider 7 and the flow channel 31 are in circumferential dislocation; and when the blowout recoil occurs, the liquid enters the flow channel 31 from the outside, causing the valve core 3 to rotate counterclockwise, and when the valve core 3 rotates to the corresponding position of the locking slider 7, the elastic force of the spring 8 pushes the locking slider 7 to block the flow channel 31, thereby achieving the purpose of preventing backflow.

[0036] Reference Figure 2 and Figure 5 As shown, the lower end of the valve core 3 is a cone head structure, which can guide the liquid toward the gap between the flow channel 31 and the valve body 1 and reduce the frontal impact force on the valve core 3 when a blowout backflow occurs.

[0037] In addition, when the drilling fluid circulates normally, the locking slider 7 placed in the groove will not move laterally under the action of the valve core 3, so even if the drilling fluid pressure is not constant, the spring 8 will not stretch and contract repeatedly, thereby improving the service life of the spring 8.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. 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 a valve body (1) and a valve core (3), wherein the valve core (3) is arranged in the valve body (1) and is rotatably connected thereto; The inner wall of the valve core (3) is provided with a flow channel (31) communicating with the lower end of the valve body (1), and the flow channel (31) is an inclined hole structure; A locking slider (7) and a spring (8) are embedded in the inner wall of the valve body (1) and are matched with the flow channel (31). The locking slider (7) and the spring (8) are squeezed and clamped between the valve core (3) and the inner wall of the valve body (1); The valve core (3) rotates to drive the flow channel (31) to move to the locking slider (7) to block it.

2. The rotary check valve according to claim 1, characterized in that: It also includes an upper bearing seat (2) and a lower bearing seat (4) which are sequentially installed in the valve body (1), and the upper bearing seat (2) and the lower bearing seat (4) are respectively arranged at the upper and lower ends of the valve core (3).

3. The rotary check valve according to claim 2, characterized in that: It also comprises a valve seat (5) installed in the valve body (1), wherein the valve seat (5) is arranged at the lower end of the valve core (3) and abuts against it, and the valve seat (5) has at least one flow hole (52) at the beginning.

4. The rotary check valve according to claim 3, characterized in that: The outer surface of the valve seat (5) is covered with a sealing ring (51).

5. The rotary check valve according to claim 3, characterized in that: It also comprises a lower joint (6), which is detachably connected to the valve body (1), and the top end of the lower joint (6) abuts against the lower end of the valve seat (5).

6. The rotary check valve according to claim 1, characterized in that: The flow channels (31) are provided with at least two and are symmetrical around the center of the valve core (3).

7. The rotary check valve according to any one of claims 1 to 6, characterized in that: The outer surface of the valve core (3) is provided with a guide ring groove (32), and a limiting protrusion (321) is provided in the guide ring groove (32); A pin (9) is fixedly mounted on the inner wall of the valve body (1), and one end of the pin (9) is inserted into the guide ring groove (32).

8. The rotary check valve according to claim 7, characterized in that: The guide ring groove (32) is arranged on the lower side of the flow channel (31).

9. The rotary check valve according to claim 1, characterized in that: The lower end of the valve core (3) is a cone head structure.

Images