High-sealing arrow-shaped check valve

Abstract

The utility model relates to the technical field of arrow-shaped check valves, in particular to a high-sealing arrow-shaped check valve. The multi-stage sealing valve has the advantages that the conical surface transition part, the annular sealing grooves in the surface of the first step part and the annular sealing ring on the outer wall of the arrow-shaped valve cover are arranged, so that after the outer wall of the arrow-shaped valve cover is pressed against the conical surface transition part on the arrow-shaped valve cover, the annular sealing ring compresses the annular sealing grooves, and therefore multi-stage sealing is achieved; a piston cylinder is arranged, and an air release hole is formed in the center of the top surface of the piston cylinder, so that an ejector rod at the top of the arrow-shaped valve cover can push a piston to the top of the piston cylinder under the pushing of pressure after a tightening bolt is loosened, and air at the top of the piston cylinder is slowly extruded out from the air release hole; therefore, the speed of pushing the arrow-shaped valve cover to cover is greatly reduced, the arrow-shaped valve cover is buffered, the damage of impact force to the arrow-shaped valve cover is reduced, the influence on the sealing effect is reduced, and the overall sealing performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of arrow-shaped check valves, in particular to a high-sealing arrow-shaped check valve. Background Art

[0002] If drilling overflow and well blowout occur during oil drilling, if timely measures are not taken to deal with it, the amount of well blowout will gradually increase, and the ejected material will spray more and more, and spray higher and higher, and finally a blowout will occur. In the past, when well blowout and well blowout occurred, it was impossible to rush to install the valve, and the only way was to force pressure to kill the well, which was not only expensive but also extremely dangerous. In the Chinese utility model CN203729947U, an arrow-shaped check valve is disclosed. The arrow-shaped check valve has the advantages of simple structure, economical and durable, corrosion resistance, erosion resistance, safety and reliability, and uses a pressure release rush installation device to solve the problem of being unable to rush to install the valve in the case of well blowout (overflow), which does solve the problems existing in the current oil drilling process. However, the arrow-shaped check valve still has the following problems in use:

[0003] The arrow valve cone surface of the high-sealing arrow-shaped check valve is in direct contact with the valve seat, with a small sealing area and poor sealing performance. Moreover, after the locking structure is released, the strong well pressure will quickly push the arrow valve to the valve seat, which is prone to impact, causing wear on the sealing surface and weakening the sealing effect. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the above technical deficiencies.

[0005] Therefore, one purpose of the utility model is to provide a high-sealing arrow-shaped check valve to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, an embodiment of one aspect of the utility model provides a high-sealing arrow-shaped check valve, including a valve body, a three-way pipe is fixedly connected to the top of the valve body, a piston cylinder is fixedly connected to the center of the top of the three-way pipe, an air leakage hole is provided at the center of the top surface of the piston cylinder, the inner wall of the valve body includes an input part and an output part, the diameter of the input part is larger than the diameter of the output part, a conical transition part is provided at the connection part between the input part and the output part, an arrow-shaped valve cover is provided on the inner wall of the valve body, a plurality of first step parts are provided on the inner wall of the conical transition part, a plurality of second step parts are provided on the conical surface of the arrow-shaped valve cover, an annular sealing groove is provided in the middle of the surface of the plurality of first step parts, and a plurality of second step parts are provided on the surface of the plurality of second step parts. An annular sealing ring is fixedly connected to the middle part, the positions of several second step parts respectively correspond to the positions of several first step parts, the positions of several annular sealing rings respectively correspond to the positions of several annular sealing grooves, the size of the annular sealing ring and the size of the inner wall of the annular sealing groove adopt interference fit, the conical surface of the outer wall of the arrow-shaped valve cover is completely fitted with the surface of the conical transition part, a push rod is fixedly connected to the center of the top of the arrow-shaped valve cover, a piston is fixedly connected to the top of the push rod, the piston is slidably connected to the inside of the piston cylinder, a threaded sleeve is fixedly connected to the bottom of one side of the piston cylinder, a tightening bolt is threadedly connected to the center of the threaded sleeve, the tightening bolt passes through the interior of the piston cylinder through the threaded sleeve and presses the push rod.

[0007] Preferably, any of the above schemes has a top opening of the three-way pipe connected to the interior of the piston cylinder, a bottom opening of the three-way pipe connected to the interior of the valve body, and a side opening of the three-way pipe connected to the outside.

[0008] The technical effect achieved by adopting the above solution is that the output crude oil can be output from the side opening of the three-way pipe through the valve body.

[0009] Preferably, any of the above schemes is that a connecting ring is fixedly connected at the center of the bottom of the valve body, the size of the outer wall of the connecting ring is smaller than the diameter of the inner wall of the input part, a reset spring is provided at the bottom of the inner wall of the input part, the reset spring is located between the arrow-shaped valve cover and the inner wall of the input part, and the length of the reset spring after reset is not less than the length of the inner wall of the input part.

[0010] The technical effect achieved by adopting the above solution is: the wellhead is conveniently connected through the connecting ring, and the position between the connecting ring and the inner wall of the input part can support the reset spring, thereby fixing the position of the reset spring.

[0011] Preferably, according to any of the above schemes, the diameter of the bottom of the arrow-shaped valve cover is smaller than the diameter of the inner wall of the input part, and the diameter of the bottom of the arrow-shaped valve cover is larger than the diameter of the output part.

[0012] The technical effect achieved by adopting the above scheme is: when the arrow-shaped valve cover presses the conical transition part, the output part can be completely closed to achieve closure. At the same time, when the arrow-shaped valve cover is pushed open, a gap can be left between the edge of the input part and the arrow-shaped valve cover to achieve drainage.

[0013] Preferably, in any of the above schemes, the length of the push rod is greater than the length of the piston cylinder, and the length of the push rod is greater than the sum of the lengths of the valve body and the tee pipe.

[0014] The technical effect achieved by adopting the above solution is: preventing the piston from being separated from the piston cylinder after the arrow-shaped valve cover is fully pressed down.

[0015] Preferably, any of the above schemes has one end outside the tightening bolt fixedly connected to a rotating handle, and one end of the tightening bolt away from the rotating handle fixedly connected to a damping head.

[0016] The technical effect achieved by adopting the above scheme is: the tightening bolt can be easily turned for tightening by rotating the handle, and the damping force of the tightening bolt pressing the push rod can be increased by the damping head, thereby improving the fixing effect.

[0017] Compared with the prior art, the advantages and beneficial effects of the utility model are:

[0018] 1. The high-sealing arrow-shaped check valve is provided with a conical transition portion, a plurality of annular sealing grooves on the surface of the first step portion and an annular sealing ring on the outer wall of the arrow-shaped valve cover. After the outer wall of the arrow-shaped valve cover is pressed tightly against the conical transition portion by pressure, the annular sealing ring presses the annular sealing groove, thereby realizing multi-stage sealing and improving the sealing effect of the arrow-shaped valve cover.

[0019] 2. The high-sealing arrow-shaped check valve is provided with a piston cylinder and an air bleed hole at the center of the top surface of the piston cylinder. After the tightening bolts are loosened, the push rod on the top of the arrow-shaped valve cover pushes the piston toward the top of the piston cylinder under the push of pressure, so that the air on the top of the piston cylinder is slowly squeezed out from the air bleed hole, thereby greatly slowing down the speed at which the arrow-shaped valve cover is pushed on, obtaining a buffer, reducing the damage to the arrow-shaped valve cover caused by the impact force, reducing the impact on the sealing effect, and improving the overall sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0022] Figure 3 For this utility model Figure 2 A schematic diagram of the enlarged structure at point A in the middle.

[0023] In the figure: 1-valve body, 2-tee pipe, 3-piston cylinder, 4-air venting hole, 5-threaded sleeve, 6-tightening bolt, 7-conical transition part, 8-arrow-shaped valve cover, 9-top rod, 10-piston, 13-return spring, 14-connecting ring, 15-first step part, 16-second step part, 17-annular sealing groove, 18-annular sealing ring. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0025] Embodiment 1: Figures 1 to 3 As shown, a high-sealing arrow-shaped check valve comprises a valve body 1, a tee pipe 2 is fixedly connected to the top of the valve body 1, a piston cylinder 3 is fixedly connected at the center of the top of the tee pipe 2, an air leakage hole 4 is provided at the center of the top surface of the piston cylinder 3, the inner wall of the valve body 1 comprises an input part 101 and an output part 102, the diameter of the input part 101 is larger than the diameter of the output part 102, a conical transition part 7 is provided at the connecting part between the input part 101 and the output part 102, an arrow-shaped valve cover 8 is provided on the inner wall of the valve body 1, a plurality of first step parts 15 are provided on the inner wall of the conical transition part 7, a plurality of second step parts 16 are provided on the conical surface of the arrow-shaped valve cover 8, an annular sealing groove 17 is provided in the middle of the surface of the plurality of first step parts 15, and a plurality of second step parts 16 are fixed in the middle of the surface An annular sealing ring 18 is connected, the positions of the several second step portions 16 respectively correspond to the positions of the several first step portions 15, the positions of the several annular sealing rings 18 respectively correspond to the positions of the several annular sealing grooves 17, the size of the annular sealing ring 18 and the size of the inner wall of the annular sealing groove 17 adopt interference fit, the conical surface of the outer wall of the arrow-shaped valve cover 8 is completely fitted with the surface of the conical transition portion 7, a push rod 9 is fixedly connected to the center of the top of the arrow-shaped valve cover 8, a piston 10 is fixedly connected to the top of the push rod 9, the piston 10 is slidably connected to the inside of the piston cylinder 3, a threaded sleeve 5 is fixedly connected to the bottom of one side of the piston cylinder 3, a tightening bolt 6 is threadedly connected to the center of the threaded sleeve 5, the tightening bolt 6 passes through the threaded sleeve 5 into the interior of the piston cylinder 3 and presses the push rod 9.

[0026] As an optional technical solution of the utility model, the top opening of the three-way pipe 2 is connected to the interior of the piston cylinder 3, the bottom opening of the three-way pipe 2 is connected to the interior of the valve body 1, and the side opening of the three-way pipe 2 is connected to the outside, so that the output crude oil can be output from the side opening of the three-way pipe 2 through the valve body 1.

[0027] As an optional technical solution of the present invention, a connecting ring 14 is fixedly connected at the center of the bottom of the valve body 1, and the size of the outer wall of the connecting ring 14 is smaller than the diameter of the inner wall of the input part 101. A reset spring 13 is arranged at the bottom of the inner wall of the input part 101, and the reset spring 13 is located between the arrow-shaped valve cover 8 and the inner wall of the input part 101. The length of the reset spring 13 after reset is not less than the length of the inner wall of the input part 101. The wellhead is conveniently connected through the connecting ring 14. At the same time, the position between the connecting ring 14 and the inner wall of the input part 101 can support the reset spring 13, thereby fixing the position of the reset spring 13.

[0028] As an optional technical solution of the present invention, the diameter of the bottom of the arrow-shaped valve cover 8 is smaller than the diameter of the inner wall of the input part 101, and the diameter of the bottom of the arrow-shaped valve cover 8 is larger than the diameter of the output part 102, so that when the arrow-shaped valve cover 8 presses the conical transition part 7, the output part 102 can be completely closed to achieve closure. At the same time, when the arrow-shaped valve cover 8 is pushed open, a gap can be left between the edge of the input part 101 and the arrow-shaped valve cover 8 to achieve drainage.

[0029] As an optional technical solution of the present invention, the length of the push rod 9 is greater than the length of the piston cylinder 3, and the length of the push rod 9 is greater than the sum of the lengths of the valve body 1 and the tee pipe 2, thereby preventing the piston 10 from detaching from the piston cylinder 3 after the arrow-shaped valve cover 8 is fully pressed down.

[0030] As an optional technical solution of the utility model, one end of the outside of the tightening bolt 6 is fixedly connected to a rotating handle, and the end of the tightening bolt 6 away from the rotating handle is fixedly connected to a damping head. The rotating handle can be used to facilitate the tightening of the tightening bolt 6. The damping force of the tightening bolt 6 pressing the push rod 9 can be increased by the damping head, thereby improving the fixing effect.

[0031] A high sealing arrow-shaped check valve, the working principle is as follows:

[0032] 1) First, inject air through the air vent 4 to push the arrow-shaped valve cover 8 downward, so that the arrow-shaped valve cover 8 is separated from the conical transition portion 7, so that the input portion 101 is connected to the output portion 102, and then tighten the push rod 9 with the tightening bolt 6 to fix the position of the arrow-shaped valve cover 8;

[0033] 2) Then connect it to the wellhead through the connecting ring 14. When connected, the crude oil is output through the valve body 1 to release the pressure, which is convenient for installation;

[0034] 3) After the valve body 1 is installed, loosen the tightening bolt 6, and the arrow-shaped valve cover 8 is pushed back to the compression cone transition part 7 by the reset spring 13 and pressure to achieve compression sealing;

[0035] 4) When the arrow-shaped valve cover 8 is reset, the top push rod 9 pushes the piston 10 toward the top of the piston cylinder 3, so that the air at the top of the piston cylinder 3 is slowly squeezed out from the vent hole, thereby greatly slowing down the speed at which the arrow-shaped valve cover 8 is pushed on, providing a buffer and reducing the damage to the arrow-shaped valve cover 8 caused by the impact force.

[0036] To sum up, the high-sealing arrow-shaped check valve, by providing the conical transition portion 7 and the annular sealing grooves 17 on the surfaces of the first step portions 15 and the annular sealing ring 18 on the outer wall of the arrow-shaped valve cover 8, can make the outer wall of the arrow-shaped valve cover 8 be pressed tightly against the conical transition portion 7 by pressure, so that the annular sealing ring 18 presses the annular sealing groove 17, thereby realizing multi-stage sealing and improving the sealing effect of the arrow-shaped valve cover 8. Furthermore, by providing the piston cylinder 3 and opening the vent hole 4 at the center of the top surface of the piston cylinder 3, after the tightening bolt 6 is loosened, the push rod 9 on the top of the arrow-shaped valve cover 8 can push the piston 10 toward the top of the piston cylinder 3 under the push of pressure, so that the air on the top of the piston cylinder 3 is slowly squeezed out from the vent hole, thereby greatly slowing down the speed at which the arrow-shaped valve cover 8 is pushed to cover, obtaining a buffer, reducing the damage to the arrow-shaped valve cover 8 caused by the impact force, reducing the influence on the sealing effect, and improving the overall sealing.

[0037] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high sealing arrow-shaped check valve, characterized in that: The invention comprises a valve body (1), the top of the valve body (1) is fixedly connected to a three-way pipe (2), the center of the top of the three-way pipe (2) is fixedly connected to a piston cylinder (3), the center of the top surface of the piston cylinder (3) is provided with an air leakage hole (4), the inner wall of the valve body (1) comprises an input part (101) and an output part (102), the diameter of the input part (101) is larger than the diameter of the output part (102), and the input part (101) and the output part (102) are connected to each other. ) is provided with a conical transition portion (7), the inner wall of the valve body (1) is provided with an arrow-shaped valve cover (8), the inner wall of the conical transition portion (7) is provided with a plurality of first step portions (15), the conical surface of the arrow-shaped valve cover (8) is provided with a plurality of second step portions (16), the middle parts of the surfaces of the plurality of first step portions (15) are provided with an annular sealing groove (17), the middle parts of the surfaces of the plurality of second step portions (16) are fixedly connected with an annular sealing groove (17). The invention relates to a sealing ring (18), the positions of the plurality of second step portions (16) respectively correspond to the positions of the plurality of first step portions (15), the positions of the plurality of annular sealing rings (18) respectively correspond to the positions of the plurality of annular sealing grooves (17), the size of the annular sealing ring (18) and the size of the inner wall of the annular sealing groove (17) are interference fit, the conical surface of the outer wall of the arrow-shaped valve cover (8) is completely in contact with the surface of the conical transition portion (7), a push rod (9) is fixedly connected at the center of the top of the arrow-shaped valve cover (8), a piston (10) is fixedly connected at the top of the push rod (9), the piston (10) is slidably connected to the inside of the piston cylinder (3), a threaded sleeve (5) is fixedly connected to the bottom of one side of the piston cylinder (3), a tightening bolt (6) is threadedly connected at the center of the threaded sleeve (5), and the tightening bolt (6) passes through the threaded sleeve (5) into the inside of the piston cylinder (3) and presses the push rod (9).

2. A high sealing arrow-shaped check valve according to claim 1, characterized in that: The top opening of the three-way pipe (2) is connected to the interior of the piston cylinder (3), the bottom opening of the three-way pipe (2) is connected to the interior of the valve body (1), and the side opening of the three-way pipe (2) is connected to the outside.

3. A high sealing arrow-shaped check valve according to claim 2, characterized in that: A connecting ring (14) is fixedly connected at the center of the bottom of the valve body (1), and the size of the outer wall of the connecting ring (14) is smaller than the diameter of the inner wall of the input part (101). A reset spring (13) is provided at the bottom of the inner wall of the input part (101), and the reset spring (13) is located between the arrow-shaped valve cover (8) and the inner wall of the input part (101). The length of the reset spring (13) after reset is not less than the length of the inner wall of the input part (101).

4. A high sealing arrow-shaped check valve according to claim 3, characterized in that: The diameter of the bottom of the arrow-shaped valve cover (8) is smaller than the diameter of the inner wall of the input part (101), and the diameter of the bottom of the arrow-shaped valve cover (8) is larger than the diameter of the output part (102).

5. A high sealing arrow-shaped check valve according to claim 4, characterized in that: The length of the push rod (9) is greater than the length of the piston cylinder (3), and the length of the push rod (9) is greater than the sum of the lengths of the valve body (1) and the three-way pipe (2).

6. A high sealing arrow-shaped check valve according to claim 5, characterized in that: One end of the tightening bolt (6) outside is fixedly connected to a rotating handle, and one end of the tightening bolt (6) away from the rotating handle is fixedly connected to a damping head.

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