High-reliability flap float valve suitable for deep well drilling

Abstract

The utility model discloses a high-reliability flap float valve suitable for deep well drilling, which relates to the technical field of drilling tool float valves, and comprises a valve body, a flap and a reset mechanism, and the flap is attached in the valve body to block the communication of a valve cavity of the valve body; the reset mechanism comprises a connecting rod assembly, a compression spring with axial elasticity and a guide assembly with a limiting space. The utility model has the advantages that: the connecting rod component transmits the received fluid force to the left end of the compression spring, and under the stabilizing action of the guide component on the compression spring, the compression spring moves linearly in a stable reciprocating manner, namely the compression spring moves in the axial direction during elastic compression, so that the stress relative to the surrounding deformation of a torsion spring is more uniform, and the stability of the compression spring is improved. The stress concentration area is far smaller than spiral twisting of the torsional spring, higher cyclic load can be borne, under the same diameter, the fatigue life is better, the device is more reliable, and the fault frequency is greatly reduced; and the arranged anti-falling assembly is used for improving the stability of the pressing ball continuously attached to the left end of the compression spring.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drilling tool float valve, more specifically to a high reliability flap float valve suitable for deep well drilling. BACKGROUND

[0002] Drilling tool float valve (flap type) is the key internal blowout preventer device for preventing well kick and blowout in drilling engineering, is usually installed at the lower end of the drill string (close to the drill bit position), its core function is to keep the fluid pressure balance inside the drill string during drilling, when drilling fluid circulates normally, the float valve is in the open state to allow fluid to pass through, when the downhole pressure is abnormal (such as well kick), the float valve closes quickly to prevent high pressure fluid from upwelling;

[0003] At present, the mainstream design of flap type float valve relies on torsional spring reset mechanism to realize the opening and closing action of valve plate, and its typical structure includes valve body, valve plate, torsional spring, sealing element and transmission pin shaft and other components, and the structure form is shown in "application number: CN201020225303.0, large diameter combined drilling tool float valve";

[0004] When torsional spring is used as a reset component:

[0005] 1) due to the complex downhole environment and frequent pressure fluctuations (such as high pressure impact when drilling fluid circulates, bottom hole pressure changes), the torsional spring is subjected to alternating stress for a long time and frequently, and the spiral torsion of the torsional spring is prone to local stress concentration, especially in high temperature, high pressure and vibration environment, material fatigue is accelerated, which is prone to spring fracture or elastic failure, eventually leading to float valve failure or sealing failure;

[0006] 2) the torsional spring needs compact installation space, and the wire diameter and the number of turns are limited by the valve body structure, so it is difficult to improve the strength by increasing the size, and the reliability is low;

[0007] That is, the existing flap type float valve has the defect of frequent failure due to high fatigue failure rate of torsional spring, and therefore, it is urgent to provide a drilling tool float valve with high flap float life for frequent reset in deep well drilling application. INVENTION CONTENTS

[0008] The utility model discloses a high reliability flap float valve suitable for deep well drilling.

[0009] The utility model discloses a high reliability flap float valve suitable for deep well drilling.

[0010] The utility model discloses a high reliability flap float valve suitable for deep well drilling, including the valve body and the flap that rotates and is connected in the valve chamber thereof, the flap is attached to the valve body to cut off the communication of the valve chamber of the valve body;

[0011] The reset mechanism is fixed on the valve body;

[0012] The reset mechanism comprises;

[0013] The connecting rod assembly is movably mounted on one side of the flap;

[0014] The compression spring with axial elasticity is rotatably connected to one side of the connecting rod assembly;

[0015] The guiding assembly with a limiting space is fixed in the valve body, and the compression spring is arranged in the limiting space of the guiding assembly to stably support the compression spring, and the elastic force of the compression spring is transmitted to the connecting rod assembly to press the flap;

[0016] When the flap is rotated to open, the axial compression force of the compression spring is applied to the connecting rod assembly through the connecting rod assembly, and the compression activity of the compression spring is stably supported by the limiting space of the guiding assembly.

[0017] As a preferred technical scheme of the utility model, the axial elastic force of the compression spring is in the same direction as the fluid flow direction of the valve body.

[0018] As a preferred technical scheme of the utility model, the connecting rod assembly comprises a pressing ball stably attached to one end of the axial elastic force of the compression spring, and a rotating rod with one end fixed to the pressing ball, and a groove is arranged at the end of the axial elastic force of the compression spring for the pressing ball to partially extend and attach, the pressing ball rotates in the groove, and the other end of the rotating rod is rotatably connected to the flap.

[0019] The included angle between the rotating rod and the fluid flow direction in the valve body is greater than 0 degrees and less than 90 degrees.

[0020] The flap is sequentially pressed by the elastic force of the rotating rod, the pressing ball and the compression spring.

[0021] As a preferred technical scheme of the utility model, the guiding assembly comprises a sleeve fixed in the valve body and a through hole arranged in the sleeve, the compression spring is arranged in the sleeve, the other end of the axial elastic force of the compression spring is fixed in the sleeve, and the pressing ball extends into the sleeve.

[0022] The through hole is away from the pressing ball, and the side of the sleeve facing the flap is provided with an inclined gap for the inclined rotating rod to place the pressing ball into the sleeve.

[0023] The compression spring is compressed in the sleeve, and the pressing ball and the rotating rod are movable in the sleeve.

[0024] As a preferred technical scheme of the utility model, the included angle between the rotating rod and the fluid flow direction in the valve body is greater than 0 degrees and less than 45 degrees.

[0025] A rotating seat is fixed in the valve body, the rotating seat is rotatably connected with the flap through a pin shaft, and the rotating seat and the flap form a valve clack assembly;

[0026] The utility model also comprises a sealing seat which is installed in the valve body;

[0027] The sealing seat comprises a pressing groove arranged in the valve cavity of the valve body, a ring groove arranged on the pressing groove, a sealing gasket which is attached to the ring groove, and a sealing sleeve which is attached to the pressing groove and is pressed tightly, the sealing sleeve is attached to and tightly presses the sealing gasket, and the sealing gasket is attached to the flap;

[0028] An annular groove is arranged on the periphery of the valve body, and a part of an outer sealing ring is attached to the annular groove.

[0029] According to the utility model, one side of the sealing gasket is in the shape of an outward convex arc.

[0030] According to the utility model, the anti-disengagement assembly is arranged on the pressing ball, and is used for limiting the movement range of the pressing ball between the compression springs to prevent the pressing ball from falling off the compression spring.

[0031] According to the utility model, the anti-disengagement assembly comprises a ring which surrounds the pressing ball and a connecting block which is fixed outside the ring, the connecting block is fixed to the compression spring, and the ring and the connecting block are movable in the sleeve, and the rod end of the rotating rod continuously faces the inner side of the ring.

[0032] When the pressing ball is attached to the compression spring, the pressing ball has a spacing between the ring and the connecting block, and the pressing ball cannot disengage from the ring.

[0033] According to the utility model, the connecting block is provided with multiple groups which are uniformly distributed between the ring and the compression spring.

[0034] The utility model has the following beneficial effects:

[0035] The movement position of the flap is transmitted through the rotation of the connecting rod assembly and the flap, the fluid force received by the connecting rod assembly is transmitted at the left end of the compression spring, under the stable action of the guide assembly on the compression spring, the compression spring is stably and linearly moved, that is, the compression spring is moved in the axial direction when being elastically compressed, the stress of the relative torsional deformation of the torsional spring is more uniform, the stress concentration area is much smaller than the helical torsion of the torsional spring, and the compression spring can bear higher cyclic load, the fatigue life is better under the same diameter, the compression spring is more reliable when being applied to deep well drilling, and the failure frequency is greatly reduced.

[0036] The anti-disengagement assembly is arranged to improve the stability of the pressing ball which is continuously attached to the left end of the compression spring. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a structural schematic view of the utility model;

[0038] Figure 2 is Figure 1 its one view of the section structure schematic diagram;

[0039] Figure 3 is Figure 2 active structure schematic diagram;

[0040] Figure 4 is Figure 1 the section structure schematic diagram of A-A among it;

[0041] Figure 5 the compression spring structure schematic view of the utility model;

[0042] Figure 6 is Figure 1 another view of the section structure schematic diagram;

[0043] Figure 7 is Figure 6 the structure schematic diagram of the part among it.

[0044] Reference signs: valve body-1, closed seat-2, valve clapper assembly-3, reset assembly-4, outer sealing ring-5, anti-dropping assembly-6, compression groove-21, ring groove-22, sealing washer-23, sealing sleeve-24, rotating seat-31, flap-32, sleeve-41, compression spring-42, compression ball-43, rotating rod-44, through opening-45, ring-61, connecting block-62. DETAILED DESCRIPTION

[0045] Example 1:

[0046] As Figures 1 to 5 shown, the embodiment proposes: a high-reliability flap float valve suitable for deep well drilling, including valve body 1, with left and right communication channels for fluid (such as mud) to flow through;

[0047] The flap 32 is rotatably connected in the valve cavity of the valve body 1, and the flap 32 is attached to the valve body 1 to cut off the communication of the valve cavity of the valve body 1. Figure 2 As

[0048] It also includes a reset mechanism 4 fixed to the valve body 1.

[0049] The reset mechanism 4 includes;

[0050] The connecting rod assembly is movably installed on one side of the flap 32, and the connecting rod assembly is disposed on the right side of the flap 32.

[0051] The compression spring 42 has axial elasticity, one end of which is connected to the outside of the connecting rod assembly in rotation; the compression spring 42 is a cylindrical spiral spring or a cylindrical corrugated spring, and the material thereof can be 304 stainless steel or 316H stainless steel or nickel-based alloy (such as Inconel 625), which is resistant to high temperature and corrosion; the cylindrical spiral spring is as shown in Figure 5 ;

[0052] The guide assembly has a limiting space, which is mounted in the valve body 1, and the compression spring 42 is arranged in the limiting space of the guide assembly to be stably supported, and the elastic force is transmitted from the compression spring 42 to the connecting rod assembly to press the flap 32;

[0053] As shown in Figure 2 , when the fluid moves to the right and pushes away the flap 32, the connecting rod assembly on the right side of the flap 32 moves synchronously through the flap 32, and the compression spring 42 connected to the right end of the connecting rod assembly is subjected to the right axial compression force, and the position of the compression spring 42 is stably compressed through the limiting space of the guide assembly, so as to limit the range of the compression spring 42;

[0054] According to the above, the reset assembly 4 is used to replace the torsion spring, and the effects are as follows:

[0055] By using the rotation of the connecting rod assembly and the flap 32 to transmit the position of the flap 32, the fluid force received by the connecting rod assembly is transmitted at the left end of the compression spring 42, and under the stable action of the guide assembly on the compression spring 42, the compression spring 42 performs stable reciprocating linear motion, that is, when the compression spring 42 is elastically compressed, it moves in the axial direction, the stress is relatively uniform, the stress concentration area is much smaller than that of the spiral torsion of the torsion spring, and the compression spring 42 can bear higher cyclic load, has better fatigue life under the same diameter, and is more reliable when used in deep well drilling, thereby greatly reducing the failure frequency.

[0056] Although the reset assembly 4 used in the present case has a relatively complex structure compared with the separate torsion spring, it is less likely to be damaged, especially in the case of deep well drilling, if the service life is not high and stable, it is easy to fail, and the cost is higher (such as taking out the drill rod again), therefore, the reset assembly 4 is extremely suitable for use in deep well drilling.

[0057] The axial elastic force of the compression spring 42 is directed in the same direction as the fluid flow direction of the valve body 1, as shown in the figure, that is, the axial elastic force of the compression spring 42 is left and right, which is easy to use with the structure of the valve body 1.

[0058] The valve body 1 has an annular groove around its periphery, and a partially exposed outer sealing ring 5 is fitted inside the annular groove; this is used to provide a seal when the valve body 1 is installed and used, by fitting it inside the drilling tool (such as a hollow drill pipe).

[0059] A rotating seat 31 is fixedly installed inside the valve body 1. The rotating seat 31 is rotatably connected to the flap plate 32 via a pin. The rotating seat 31 and the flap plate 32 constitute the valve disc assembly 3. Figure 2 As shown, a pin passes through both the upper side of the flap 32 and the rotating seat 31, thereby enabling the flap 32 to rotate and fit against the sealing surface of the sealing seat 2 to close the left and right communication of the valve chamber of the valve body 1.

[0060] It also includes a sealing seat 2 installed inside the valve body 1;

[0061] Specifically, the sealing seat 2 includes a pressing groove 21 in the valve cavity of the valve body 1, a ring groove 22 on the pressing groove 21, a sealing gasket 23 fitted in the ring groove 22, and a sealing sleeve 24 fitted in the pressing groove 21 and pressed. The sealing sleeve 24 fits and presses the sealing gasket 23, and the sealing gasket 23 is fitted with a flap 32.

[0062] like Figure 2 As shown, a compression groove 21 is formed by annular expansion at the inner side of the valve cavity of valve body 1. A ring groove 22 is formed by annular expansion at the inner side near the right end of the compression groove 21. First, the sealing gasket 23 is placed into the ring groove 22 and pressed tightly. Then, the sealing sleeve 24 is pressed into the compression groove 21. At this time, the sealing gasket 23 is pressed tightly on the outside of the sealing sleeve 24, thus forming an annular sealing surface facing to the right. The right end of the sealing gasket 23 is sealed by the left end of the flap 32.

[0063] The outer sealing ring 5 and sealing gasket 23 mentioned above are made of fluororubber, which has excellent high temperature resistance, chemical corrosion resistance and oil resistance.

[0064] like Figure 3 As shown, the cross-section of the groove 22 is L-shaped, and the cross-section of the sealing gasket 23 is also L-shaped, which can better secure the sealing gasket 23 (not shown in the figure, the cross-sections of the groove 22 and the sealing gasket 23 can also be rectangular or other shapes).

[0065] Among them, the sealing gasket 23 has an outwardly convex arc shape on one side of the flap 32, such as... Figure 3 As shown, the right end of the sealing gasket 23 is arc-shaped and fits against the left end of the flap 32. When the phases are pressed together, the phase contact stress is higher than the contact force between the planes, resulting in good sealing performance. Furthermore, impurities are less likely to accumulate at the phase contact surface, thereby improving sealing reliability.

[0066] Specifically, the linkage assembly includes a compression ball 43 stably attached to one end of the compression spring 42 with axial elastic force, and a rotating rod 44 with one end fixed to the compression ball 43. The compression spring 42 with axial elastic force attached to the compression ball 43 is provided with a groove for the compression ball 43 to partially extend into and fit. The compression ball 43 rotates in the groove, and the other end of the rotating rod 44 is rotatably connected to the flap 32.

[0067] The flap 32 is pressed tightly by the rotating rod 44, the pressing ball 43 and the compression spring 42 in sequence;

[0068] This groove is the spring opening at the left end of the aforementioned cylindrical helical spring or cylindrical corrugated spring;

[0069] Specifically, the guide assembly includes a sleeve 41 fixed inside the valve body 1 and a port 45 provided inside the sleeve 41. A compression spring 42 is provided inside the sleeve 41 and the other end of the compression spring 42 with axial elastic force is fixed inside the sleeve 41. A pressure ball 43 extends into the sleeve 41. The inside of the sleeve 41 is the limiting space.

[0070] The compression spring 42 moves within the sleeve 41 under compression, and the clamping ball 43 and the rotating rod 44 move within the sleeve 41.

[0071] like Figure 2 As shown, the sleeve 41 is fixed to the top of the valve body 1, with the opening of the sleeve 41 facing left. The left end of the sleeve 41 is closed and a centrally located through-hole 45 is provided to allow fluid to flow and drain when it enters the sleeve 41. The compression spring 42 is inserted into the sleeve 41, with its right end fixed against the right end of the sleeve 41. The arc-shaped part of the pressure ball 43 is inserted into the groove at the left end of the compression spring 42 and fits against it to provide stable support. The right end of the flap 32 is provided with... The mounting groove is provided by a rotating rod 44 fixed to the outside of the pressure ball 43, which extends into the mounting groove and is simultaneously passed through the rotating rod 44 and the flap 32 by a pin (not shown in the figure; the mounting groove can also be replaced by a connecting plate fixed to the right end of the flap 32, which can then be rotated by a pin). This provides rotation of the rotating rod 44 relative to the flap 32. The compression spring 42 provides elastic pressure to the pressure ball 43 and the rotating rod 44 to stabilize the flap 32 in contact with the right end of the sealing gasket 23.

[0072] The sleeve 41 has an inclined notch on the side facing the flap 32, which allows the tilting rod 44 to insert the clamping ball 43 into the sleeve 41; such as Figure 2As shown, the inclined gap is inclined to the lower right of the left end of the sleeve 41, so that the compression spring 42 can better form an elastic pressure on the pressing flap 32 under the premise that the pressing ball 43 is limited at the top end of the inner wall of the sleeve 41 to ensure the left and right displacement of the pressing ball 43; and the inclined gap can serve as a space for the movement of the rotating rod 44, reducing the jamming interference of the overall structure during reciprocating movement; at the same time, as shown, it can serve as an increased insertion space after the flap 32 is turned over to improve the flow rate of the opened fluid flow; Figure 3

[0073] The included angle between the rotating rod 44 and the fluid flow direction in the valve body 1 is >0 degrees and <90 degrees (preferably, the included angle is >0 degrees and <45 degrees); as shown, Figure 2 As shown, the included angle is the included angle θ (the included angle is the angle of counterclockwise rotation of the rotating rod 44 and the horizontal direction of the fluid flow direction with the rotating position of the rotating rod 44 and the rotating end of the flap 32 as the rotation position), according to the above, since the flap 32 drives the rotating rod 44 to rotate, although 45 degrees < θ < 90 degrees can also be turned over, but a larger force is generated to inhibit the right movement of the pressing ball 43, so that the overall structure has a large jamming and the flap 32 needs a large force to open, and when the included angle is in the range of >0 degrees and <45 degrees, the pulling force of the rotating rod 44 pushing the pressing ball 43 to the right can better ensure the stability of the overall structure during movement;

[0074] When the flap 32 is turned over, the rotating rod 44 rotates with the flap 32 and the pressing ball 43 is attached to the compression spring 42, so as to compress the compression spring 42 to make the pressing ball 43 and the rotating rod 44 extend into the sleeve 41; when the fluid flows from left to right to press the flap 32, the change in the operation process is as shown, Figures 2 to 3 The reciprocating movement is carried out.

[0075] Example 2:

[0076] As shown in Figure 1 , 4 ~7, the difference from example 1 is that:

[0077] In the deep well drilling environment, the valve body 1 may be affected by mud flow, pressure fluctuation or external vibration, etc., which may cause the opening and closing action of the flap 32 to become irregular, and an additional impact force is generated on the pressing ball 43 (for example, the compression spring 42 is in a compressed state, and the pressing ball 43 is not attached to the compression spring 42, at this time, due to the vertical rotation of the rotating rod 44, the pressing ball 43 may be automatically displaced), which may cause the risk of the pressing ball 43 being separated from the compression spring 42;

[0078] ​To address the aforementioned risks, an anti-detachment component 6 is also provided on the compression ball 43, which limits the range of movement of the compression ball 43 away from the contact between the compression ball 43 and the compression spring 42 to prevent the compression ball 43 from falling off the compression spring 42, thereby improving the stability of the compression ball 43 in maintaining its contact with the left end of the compression spring 42.

[0079] The specific structure of the anti-hair loss component 6 is shown below:

[0080] The anti-detachment component 6 includes a retaining ring 61 surrounding the pressure ball 43 and a connecting block 62 fixed to the outside of the retaining ring 61. The connecting block 62 is fixed to the outside of the compression spring 42. Both the retaining ring 61 and the connecting block 62 move within the sleeve 41. The rod end of the rotating rod 44 continuously faces the inside of the retaining ring 61.

[0081] When the compression ball 43 is in contact with the compression spring 42, there is a gap between the compression ball 43 and the retaining ring 61 and the connecting block 62, and the compression ball 43 cannot be dislodged through the retaining ring 61;

[0082] like Figures 6 to 7 As shown, a circular ring 61 is fitted on the left side of the center of the compression ball 43. The inner diameter of the ring 61 is smaller than the circumference of the compression ball 43. The compression ball 43 rests against the left end of the compression spring 42. After the ring 61 and the compression spring 42 are connected by the connecting block 62, it can be ensured that the compression ball 43 remains stable between the ring 61 and the compression spring 42. Before the anti-detachment component 6 breaks, the compression ball 43 will not fall off at the compression spring 42.

[0083] The spacing is designed to ensure that the pressure ball 43 can move, and the end of the lever 44 when the pressure ball 43 moves is always facing the inside of the wrapping ring 61, so as to ensure that the lever 44 is not blocked by the wrapping ring 61.

[0084] The connecting blocks 62 are provided in multiple sets and are evenly distributed between the retaining ring 61 and the compression spring 42. As shown in the figure, multiple sets of connecting blocks 62 are fixed between the left end of the retaining ring 61 and the outer periphery of the right end of the compression spring 42 to improve the overall connection strength.

[0085] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0086] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A high-reliability flap float valve for deep well drilling, comprising a valve body (1) and a flap (32) rotatably connected in the valve cavity of the valve body (1), the flap (32) being attached to the valve body (1) to cut off the communication of the valve cavity of the valve body (1); further comprising a reset mechanism (4) fixed to the valve body (1); the reset mechanism (4) comprises: a connecting rod assembly movably mounted on one side of the flap (32); a compression spring (42) having axial elasticity, one end of the axial elasticity of the compression spring (42) being rotatably connected to the outside of the connecting rod assembly; a guide assembly having a limiting space, the compression spring (42) being arranged in the limiting space of the guide assembly to be stably supported, and the elastic force of the compression spring (42) being transmitted to the connecting rod assembly to press the flap (32); when the flap (32) is rotated to open, the connecting rod assembly moves to exert an axial compression force on the compression spring (42) and the limiting space of the guide assembly stably supports the compression activity of the compression spring (42). The axial elastic force of the compression spring (42) is directed in the same direction as the fluid flow direction of the valve body (1). characterized in that The connecting rod assembly comprises a pressing ball (43) stably attached to one end of the axial elastic force of the compression spring (42), and a rotating rod (44) with one end fixed to the pressing ball (43), and a groove is arranged at the end of the axial elastic force of the compression spring (42) attached to the pressing ball (43) for the partial insertion of the pressing ball (43), the pressing ball (43) rotates in the groove, and the other end of the rotating rod (44) is rotatably connected to the flap (32). The angle between the rotating rod (44) and the fluid flow direction in the valve body (1) is greater than 0 degrees and less than 90 degrees. The flap (32) is sequentially pressed by the elastic force of the rotating rod (44), the pressing ball (43) and the compression spring (42). The angle between the rotating rod (44) and the fluid flow direction in the valve body (1) is greater than 0 degrees and less than 45 degrees. The guide assembly comprises a sleeve (41) fixed in the valve body (1) and a through hole (45) arranged in the sleeve (41), the compression spring (42) is arranged in the sleeve (41) and the other end of the axial elastic force of the compression spring (42) is fixed in the sleeve (41), and the pressing ball (43) is inserted into the sleeve (41) at the end of the sleeve (41).

2. The high-reliability float valve according to claim 1, wherein The through hole (45) is away from the pressing ball (43), and one side of the sleeve (41) facing the flap (32) is provided with an inclined gap for the rotating rod (44) to put the pressing ball (43) into the sleeve (41).

3. The high-reliability float valve according to claim 1, wherein The compression spring (42) is compressed in the sleeve (41), and the pressing ball (43) and the rotating rod (44) move in the sleeve (41). A rotating seat (31) is fixed in the valve body (1), the rotating seat (31) is rotatably connected to the flap (32) through a pin, and the rotating seat (31) and the flap (32) form a valve disc assembly (3). Further comprising a sealing seat (2) mounted in the valve body (1).

4. The high-reliability float valve according to claim 3, wherein ​ 5. The high-reliability flashboard float valve for deep well drilling according to claim 4, characterized in that, ​ ​ ​ 6. A high-reliability flashboard float valve for deep well drilling according to claim 5, wherein ​ ​ The closed seat (2) comprises a pressing groove (21) arranged in the valve cavity of the valve body (1), a ring groove (22) arranged on the pressing groove (21), a sealing gasket (23) fitted in the ring groove (22), and a sealing sleeve (24) fitted in the pressing groove (21) and pressing the sealing gasket (23); the sealing gasket (23) is externally fitted with a flap (32); The valve body (1) is externally provided with an annular groove, and the annular groove is internally fitted with an outer sealing ring (5) partially exposed.

7. A high-reliability flashboard float valve for deep well drilling according to claim 6, wherein The sealing gasket (23) is externally fitted with the flap (32) on one side in an outwardly convex arc shape.

8. The high-reliability float valve according to claim 3, wherein The anti-disengagement assembly (6) is arranged on the pressing ball (43) and is used for limiting the movement range of the pressing ball (43) from the compression spring (42) to prevent the pressing ball (43) from falling off the compression spring (42).

9. A high-reliability flashboard float valve for deep well drilling according to claim 8, wherein The anti-disengagement assembly (6) comprises a ring (61) arranged around the pressing ball (43) and a connecting block (62) fixed outside the ring (61); the connecting block (62) is fixed outside the compression spring (42); the ring (61) and the connecting block (62) are movable in the sleeve (41); the rod end of the rotating rod (44) continuously faces the inner side of the ring (61); When the pressing ball (43) is fitted with the compression spring (42), the pressing ball (43) has a spacing between the ring (61) and the connecting block (62), and the pressing ball (43) cannot be disengaged through the ring (61).

10. The high-reliability flashboard float valve for deep well drilling according to claim 9, wherein The connecting block (62) is provided with multiple groups and is uniformly distributed between the ring (61) and the compression spring (42).

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