Safety double check valve for well drilling

Abstract

The invention discloses a safety double check valve for well drilling, and relates to the technical field of check valves, the safety double check valve comprises a check valve body, an input end, an output end and an external equipment connecting end, the left end of the check valve body is connected with the output end, the right end of the check valve body is connected with the input end, the external equipment connecting end is arranged in the middle of the check valve body, and the safety double check valve further comprises a control assembly, a sealing assembly and a control rod; the check valve body is internally provided with a moving cavity and a conveying cavity, the control assembly is installed in the moving cavity, a control rod is installed in the moving cavity, the sealing assembly is installed in the conveying cavity, the control assembly achieves rotation of the control rod through changes of materials in the conveying cavity, and the sealing assembly seals the conveying cavity through rotation of the control rod when different paths of the materials are changed. The problems that when corrosive fluid is conveyed for a long time, due to the fact that the corrosive fluid affects the valve clack, the gap between the valve clack and the valve body is increased, the sealing performance is poor, and then the overflow phenomenon occurs are solved.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, and more particularly to a safety double check valve for drilling. Background Art

[0002] A check valve is a valve used to control the unidirectional flow of fluid. Its main function is to prevent the fluid from flowing back in the pipeline, that is, to prevent the fluid from flowing in the opposite direction. The check valve is usually installed in a vertical position in the pipeline system to ensure that it can operate normally. The existing check valve uses a circular valve disc to achieve the function of preventing backflow. When the fluid flows in the forward direction of the pipeline, the valve opens to allow the fluid to pass. However, when the fluid tries to flow in the opposite direction, the valve closes to prevent the fluid from flowing back.

[0003] In drilling operations, fluid control systems play a vital role. In drilling and well repair operations, in order to prevent the mud in the annulus from returning to the drill string and spraying onto the drilling platform when connecting a single root or tripping, and to prevent the bottom fluid from entering the drill bit under the action of formation pressure and causing overflow, well kick or blowout, a drill bit float valve is connected to the bottom of the drill string. Traditional mining fluid control systems mostly use a single check valve. This design has many limitations when dealing with complex fluid control requirements during drilling. In order to ensure the continuity and safety of drilling operations, a highly reliable and functionally integrated valve system is particularly necessary.

[0004] The integrated double check valve is a specially designed valve that combines the functions of two independent check valves into one, aiming to provide a more efficient and safer fluid control solution. The valve system is specially optimized for the drilling environment and operating conditions to adapt to the unique challenges of drilling.

[0005] When a check valve is used to transport fluid in a pipeline system, a circular valve disc is used to prevent the fluid from flowing back. Due to the gap between the valve disc and the inner wall of the check valve, the sealing effect of the check valve is poor, resulting in overflow. Especially when the check valve is used to transport corrosive fluids, long-term transportation will cause the gap to expand, thereby affecting the sealing effect, and causing the overflow of the check valve to become more serious.

[0006] The Chinese patent with authorization announcement number CN107429853B discloses a check valve and a valve core, wherein the valve core comprises: an outer frame portion; a sealing portion, which is arranged on the inner side of the outer frame portion and opens and closes the fluid flow path of the component on one side of the pair of components; a connecting portion, which allows the fluid to pass through in the thickness direction and connects the outer frame portion and the sealing portion, wherein the outer frame portion, the sealing portion and the connecting portion are formed by an elastomer, and the thickness of the outer frame portion is set to be larger than the surface dimension between the sandwiched surfaces of the pair of components in the engaged state. In the engaged state of the pair of components, the outer frame portion is clamped by the sandwiched surfaces of the pair of components so as to be elastically compressed and deformed in the thickness direction, thereby causing the sealing portion to displace to one side in its thickness direction. By using the check valve and the valve core of the present invention, the fluid flow path through which the fluid flows can be reliably closed without the need for high-precision processing.

[0007] Although this check valve can improve the sealing effect and avoid overflow, when facing corrosive fluids, it will still cause corrosion between the valve disc and the valve body, resulting in an increasingly larger gap, and then poor sealing, leading to overflow. In view of the above situation, in order to overcome the above technical problems, the present invention designs a safety double check valve for drilling, which solves the above technical problems. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a safety double check valve for drilling. The device solves the problem that when corrosive fluid is transported for a long time, the corrosive fluid will affect the valve disc, causing the gap between the valve disc and the valve body to increase, resulting in poor sealing performance and overflow.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A safety double check valve for drilling, comprising a check valve body, an input end, an output end and an external equipment connection end, wherein the left end of the check valve body is connected to the output end, the right end of the check valve body is connected to the input end, and the middle part of the check valve body is provided with an external equipment connection end, and also comprises a control component, a sealing component and a control rod, wherein the check valve body is used to be installed in a pipeline system, and a circular valve disc is provided inside to prevent fluid backflow, and a movement cavity and a conveying cavity are provided inside the check valve body, and the diameters at both ends of the conveying cavity are larger than the middle diameter, and the end with the larger middle diameter can be used to set the control component and the sealing component, so as to ensure that there is enough space for installation and the range of movement of the control component and the sealing component is ensured at the same time, the control component is installed in the movement cavity, and a control rod is installed in the movement cavity, and the sealing component is installed in the conveying cavity, and the control component realizes the rotation of the control rod by the change of the material in the conveying cavity, and the sealing component realizes the switching seal of the input end and the output end by the rotation of the control rod when the material changes different paths.

[0011] As a further improvement of the present invention, the control component includes a No. 1 sealing ball, a moving ring, a No. 1 spring, a No. 1 stopper, a driving wheel and a rotating wheel. The No. 1 sealing ball is installed inside the conveying chamber and is close to the external device connection end. The moving ring is installed on the left side of the No. 1 sealing ball. The moving ring is fixedly connected to the No. 1 sealing ball to ensure that when the fluid movement pushes the No. 1 sealing ball, the No. 1 sealing ball and the moving ring move synchronously to improve the sealing of the conveying chamber. The moving ring is provided with a cylindrical protrusion on the side close to the control rod. A No. 1 spring is installed on the left side of the moving ring. The other end of the No. 1 spring is connected to the No. 1 stopper. The No. 1 sealing ball is reset by the No. 1 spring. Since the check valve is installed vertically In the pipeline system, when the fluid stops entering the delivery chamber, the fluid is prevented from entering the delivery chamber due to its own weight, and the No. 1 spring is fixed by the No. 1 stopper, so that when the external device connection end is extracted, the fluid can push the No. 1 sealing ball and compress the No. 1 spring, so that the No. 1 sealing ball no longer blocks the delivery chamber, and the fluid flows from the two ends of the delivery chamber to the middle of the delivery chamber and flows out through the external device connection end. A driving wheel is installed on the left side of the No. 1 stopper, and the driving wheel is coaxially installed with the control rod, and the driving wheel and the control rod are fixedly installed to ensure that the driving wheel is driven to rotate synchronously while the control rod rotates. A rotating wheel is installed on the left side of the driving wheel, and rotating grooves are equidistantly provided on the circumferential surface of the rotating wheel.

[0012] As a further improvement of the present invention, the sealing assembly includes a No. 2 stopper, a No. 2 spring, a No. 2 sealing ball, a left sealing mechanism and a right sealing mechanism, the No. 2 stopper is installed inside the conveying chamber and is installed opposite to the No. 1 stopper, a No. 2 spring is installed on the right side of the No. 2 stopper, one end of the No. 2 spring is connected to the No. 2 stopper, and the other end is connected to the No. 2 sealing ball, the installation method of the No. 2 sealing ball is opposite to that of the No. 1 sealing ball, when the external device pushes the fluid to the conveying chamber at the external device connection end, the fluid can push the No. 2 sealing ball to compress the No. 2 spring and flow out through the conveying chamber, and at the same time, because the installation methods are opposite, the middle diameter of the conveying chamber is larger than the diameters at both ends, and the fluid flows upward and cannot flow out from the upper end of the valve body through the No. 1 sealing ball, thereby realizing the reverse flow of the fluid, a left sealing mechanism is installed on the right side of the No. 2 sealing ball, a right sealing mechanism is installed on the right side of the left sealing mechanism, and the left sealing mechanism and the right sealing mechanism are installed coaxially, and the coaxiality can ensure that the left sealing mechanism and the right sealing mechanism move synchronously, thereby improving the sealing effect of the check valve.

[0013] As a further improvement of the present invention, the left sealing mechanism includes a fixed plate, a rotating blade, a rotating plate and a turbine blade, the fixed plate is installed in the middle of the conveying chamber and close to the No. 2 sealing ball, the rotating blade is installed on the right side of the fixed plate, the rotating plate is installed on the right side of the rotating blade, the rotating plate is in contact with the rotating wheel, the circumferential surface of the rotating plate is provided with a fixed groove, and a gear tooth is installed in the fixed groove, one side of the gear tooth is in contact with the fixed groove, and the middle part of the other side is connected to the fixed groove through a reset spring, so that when the rotating plate rotates forward, the rotating groove is in contact with the gear tooth, and the rotating wheel drives the rotating plate to rotate to realize the expansion of the rotating blade, thereby realizing the sealing of the lower end conveying chamber, the rotation of the rotating plate drives the rotating blade to expand and contract on the fixed plate, the side of the rotating plate away from the rotating blade is connected with the turbine blade, and the rotating plate and the turbine blade are coaxially installed to ensure that when the fluid passes through the turbine blade, the turbine blade is rotated accordingly by the thrust of the fluid, thereby ensuring synchronous rotation, controlling the closing of the rotating blade, and improving the sealing performance.

[0014] As a further improvement of the present invention, the shape of the gear teeth is teardrop-shaped, and when the rotating plate is reversed, the teardrop-shaped curved part fits with the rotating groove, and an inclined surface consistent with the inclination angle of the rotating groove is provided on the opposite side of the teardrop-shaped curved part. Through the curved part of the teardrop-shaped gear teeth fitting with the rotating groove, the curved part slides better along the rotating groove to avoid contact with the rotating groove, and the gear teeth drive the rotating wheel to rotate. The inclined surface can increase the contact area between the locking tooth and the rotating groove, and thus can better fit when the rotating wheel drives the rotating plate to rotate, avoiding the phenomenon of tooth disengagement of the rotating wheel.

[0015] As a further improvement of the present invention, spoiler blades are installed on the inner side of the moving ring, and the spoiler blades are installed in an array at equal intervals around the circumference. The array-mounted spoiler blades change the state of the fluid passing through the moving ring, reduce the turbulence of the fluid, and reduce the water hammer phenomenon. A pushing slope is provided at the bottom of the moving ring, and the moving ring is fitted with the inner wall of the conveying chamber. For impurities in the fluid, the reciprocating motion of the moving ring can reduce the accumulation of impurities and avoid slowing down the flow rate of the fluid.

[0016] As a further improvement of the present invention, an inclined surface is provided on the rotating blade, and a guide groove is provided on the inclined surface of the rotating blade. Multiple rotating blades are spliced ​​into a conical surface. The guide groove is provided on the inclined surface to allow the fluid to flow along its surface, thereby avoiding the fluid directly hitting the surface of the rotating blade to cause hydroplaning, reducing water flow impact, and avoiding gaps between the rotating blades. At the same time, the diameter of the conical surface is equal to the diameter of the left end of the conveying chamber, which can ensure the sealing performance and avoid fluid overflow, affecting the stability of the device.

[0017] As a further improvement of the present invention, the right sealing mechanism includes a left baffle, a right baffle, a rotating ring and a sealing blade. The left baffle is fixedly installed inside the conveying chamber and close to the No. 1 baffle. A rotating ring is installed on the right side of the left baffle. The inner circumferential surface of the rotating ring has an array of latch teeth at equal intervals, and the outer circumferential surface of the rotating ring is provided with the same latch teeth. The latch teeth are provided at intervals inside and outside the rotating ring to ensure that the sealing blades can be opened and closed while reducing the manufacturing cost of the mechanism. The latch teeth on the inner side of the rotating ring cooperate with the sealing blades, and the latch teeth on the outer side of the rotating ring cooperate with the gear teeth on the driving wheel, so as to achieve the effect of slowly opening and closing the sealing blades by rotating the control lever. The right side of the rotating blade is connected to the right baffle.

[0018] As a further improvement of the present invention, a spiral groove is provided on the circumferential surface of the control rod, and the spiral groove cooperates with the cylindrical protrusion, so that the rotating ring can be rotated by the moving ring. The length of the spiral groove on the control rod is equal to the distance from the No. 1 sealing ball to the No. 1 stopper. The equal distance ensures that when the fluid pushes the No. 1 sealing ball, the sealing blade opens accordingly, and when the No. 1 sealing ball contacts the No. 1 stopper, the sealing blade is fully opened, and when it is reset by the elastic force of the reset spring, it can be slowly closed, while ensuring the sealing performance, avoiding the phenomenon of excessive fluid impact force on the check valve.

[0019] As a further improvement of the present invention, the ends of the No. 1 sealing ball and the No. 2 sealing ball that are respectively away from the No. 1 stopper and the No. 2 stopper are concave-convex, and the concave-convex surface can increase the contact area between the fluid and the sealing ball, so that the fluid can better push the sealing ball to move, while slowing down the speed of the fluid passing through, avoiding excessive impact force, resulting in excessive gap between the sealing ball and the conveying cavity, and reducing the sealing effect. The No. 1 stopper and the No. 2 stopper are both truncated cone-shaped, and a flow port is opened at the bottom end of the truncated cone, so as to ensure the stability of the operation of the mechanism, and enable the fluid to flow through the flow port while ensuring the stability of the mechanism.

[0020] Beneficial effects of the present invention:

[0021] 1. The safety double check valve for drilling provided by the present invention has a control component and a sealing component, and the fluid flows unidirectionally inside the check valve body. When the external device extracts the fluid, the speed of the fluid passing through is slowed down, and the outlet on the other side is sealed at the same time to prevent the corrosive fluid from affecting the sealing ball on the other side. When the fluid stops flowing, the inlet and outlet of the conveying cavity are double-sealed to prevent the corrosive fluid from corroding the sealing balls on both sides. When the external device pushes the fluid, the state of the fluid passing through is changed to reduce the impact force of the fluid, and at the same time, the fluid is prevented from flowing to the other end of the conveying cavity, thereby improving the sealing performance of the check valve and avoiding overflow.

[0022] 2. The safety double check valve for drilling provided by the present invention, by setting a control component, slowly opens and closes the flow channel according to the speed of the fluid passing through, and at the same time seals the sealing mechanism on the other side of the conveying chamber to prevent the sealing ball from being affected by the fluid, thereby improving the sealing performance of the conveying chamber and avoiding overflow.

[0023] 3. The safety double check valve for drilling provided by the present invention has a sealing component. When an external device extracts fluid, the sealing effect of the check valve is ensured to make the fluid move in one direction. When the external device pushes the fluid, the one-way movement of the fluid is ensured. The fluid inside the check valve can be completely discharged by the dead weight of the fluid, so that the fluid can be prevented from remaining inside the check valve and corroding the valve core, thereby ensuring the sealing effect and improving the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0026] Figure 3 This is a partial enlargement of the left sealing mechanism of the present invention. Figure 1 ;

[0027] Figure 4 It is a partial enlarged view of the right sealing mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the control component and the sealing component of the present invention from left to right;

[0029] Figure 6 This is a partial enlargement of the left sealing mechanism of the present invention. Figure 2 ;

[0030] Figure 7 It is a schematic diagram of the control component and the sealing component of the present invention from right to left;

[0031] Figure 8 It is a schematic diagram of the overall structure of the left sealing mechanism of the present invention;

[0032] Fig. 9 It is an exploded view of the left sealing mechanism of the present invention;

[0033] Fig.10 It is a schematic diagram of the overall structure of the mobile ring of the present invention;

[0034] Fig.11 It is an exploded view of the right sealing mechanism of the present invention.

[0035] Figure numerals: 1, check valve body; 11, moving chamber; 12, conveying chamber; 2, input end; 3, output end; 4, external device connection end; 5, control assembly; 51, No. 1 sealing ball; 52, moving ring; 521, spoiler blade; 522, cylindrical protrusion; 53, No. 1 spring; 54, No. 1 stopper; 541, flow port; 55, driving wheel; 56, rotating wheel; 561, rotating groove; 6, sealing assembly; 61, No. 2 stopper; 62, No. 2 No. 1 spring; 63, No. 2 sealing ball; 64, left sealing mechanism; 641, fixed plate; 642, rotating blade; 6421, guide groove; 643, rotating plate; 6431, fixed groove; 6432, gear; 6433, return spring; 644, turbine blade; 65, right sealing mechanism; 651, left baffle; 652, right baffle; 653, rotating ring; 6531, latch tooth; 654, sealing blade; 7, control rod; 71, spiral groove. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] refer to Figures 1 to 11 As shown, the safety double check valve for drilling includes a check valve body 1, an input end 2, an output end 3 and an external equipment connection end 4. The left end of the check valve body 1 is connected to the output end 3, the right end of the check valve body 1 is connected to the input end 2, and the middle of the check valve body 1 is provided with an external equipment connection end 4. The check valve body 1 is divided into a front and a rear part and connected by screws. Such a configuration is convenient for installation and also easy for later maintenance. The check valve body 1 also includes a control component 5, a sealing component 6 and a control rod 7. The check valve body 1 is used to be installed in a pipeline system, and a circular valve disc is provided inside to prevent fluid backflow. A movement cavity 1 is provided inside the check valve body 1. 1 and a conveying cavity 12, the diameters of both ends of the conveying cavity 12 are larger than the middle diameter, and the end with the larger middle diameter can be used to set the control component 5 and the sealing component 6, ensuring that there is enough space for installation and the range of movement of the control component 5 and the sealing component 6. The control component 5 is installed in the motion cavity 11, and a control rod 7 is installed in the motion cavity 11. The sealing component 6 is installed in the conveying cavity 12. The control component 5 realizes the rotation of the control rod 7 through the change of the material in the conveying cavity 12. The sealing component 6 realizes the switching sealing of the input end 2 and the output end 3 through the rotation of the control rod 7 when the material changes different paths.

[0038] The control assembly 5 includes a No. 1 sealing ball 51, a moving ring 52, a No. 1 spring 53, a No. 1 stopper 54, a driving wheel 55 and a rotating wheel 56. The No. 1 sealing ball 51 is installed inside the conveying chamber 12 and is close to the external device connection end 4. The moving ring 52 is installed on the left side of the No. 1 sealing ball 51. The moving ring 52 is fixedly connected to the No. 1 sealing ball 51 to ensure that when the fluid movement pushes the No. 1 sealing ball 51, the No. 1 sealing ball 51 and the moving ring 52 move synchronously to improve the sealing performance of the conveying chamber 12. A cylindrical protrusion 522 is provided on the side of the moving ring 52 close to the control rod 7. A No. 1 spring 53 is installed on the left side of the moving ring 52. The other end of the No. 1 spring 53 is connected to the No. 1 stopper 54. The No. 1 sealing ball 51 is reset by the No. 1 spring 53. Since the check valve is vertically installed in the pipeline system When the fluid stops entering the delivery chamber 12, the fluid is prevented from entering the delivery chamber 12 due to its own weight. The No. 1 spring 53 is fixed by the No. 1 stopper 54, so that when the external device connection end 4 is extracted, the fluid can push the No. 1 sealing ball 51 and compress the No. 1 spring 53, so that the No. 1 sealing ball 51 no longer blocks the delivery chamber 12, so that the fluid flows from both ends of the delivery chamber 12 to the middle of the delivery chamber 12 and flows out through the external device connection end 4. A driving wheel 55 is installed on the left side of the No. 1 stopper 54. The driving wheel 55 is coaxially installed with the control rod 7, and the driving wheel 55 is fixedly installed with the control rod 7 to ensure that the driving wheel 55 is driven to rotate synchronously while the control rod 7 rotates. A rotating wheel 56 is installed on the left side of the driving wheel 55, and rotating grooves 561 are equidistantly provided on the circumferential surface of the rotating wheel 56.

[0039] During operation, the external device is connected to the check valve body 1 via the external device connection end 4. When the external device starts to extract fluid, the fluid enters from the input end 2, pushing the No. 1 sealing ball 51 to move, and the moving ring 52 moves synchronously with it, compressing the No. 1 spring 53. The No. 1 moving ring 52 drives the control rod 7 to rotate. When the No. 1 sealing ball 51 moves to the position of the No. 1 stopper 54, the control rod 7 rotates one circle, and the driving wheel 55 and the rotating wheel 56 on the control rod 7 rotate one circle with it.

[0040] The sealing assembly 6 includes a No. 2 stopper 61, a No. 2 spring 62, a No. 2 sealing ball 63, a left sealing mechanism 64 and a right sealing mechanism 65. The No. 2 stopper 61 is installed inside the conveying chamber 12 and is installed opposite to the No. 1 stopper 54. The No. 2 spring 62 is installed on the right side of the No. 2 stopper 61. One end of the No. 2 spring 62 is connected to the No. 2 stopper 61, and the other end is connected to the No. 2 sealing ball 63. The installation method of the No. 2 sealing ball 63 is opposite to that of the No. 1 sealing ball 51. When the external device pushes the fluid to the conveying chamber 12 at the external device connection end 4, the fluid can push The No. 2 sealing ball 63 compresses the No. 2 spring 62 to flow out through the conveying chamber 12. At the same time, because the installation method is opposite, the middle diameter of the conveying chamber 12 is larger than the diameter at both ends. When the fluid flows upward, it cannot flow out through the upper end of the valve body of the No. 1 sealing ball 51, causing the fluid to flow back. A left sealing mechanism 64 is installed on the right side of the No. 2 sealing ball 63, and a right sealing mechanism 65 is installed on the right side of the left sealing mechanism 64. The left sealing mechanism 64 and the right sealing mechanism 65 are installed coaxially. The coaxiality can ensure that the left sealing mechanism 64 and the right sealing mechanism 65 move synchronously, thereby improving the sealing effect of the check valve.

[0041] During operation, the control rod 7 pushes the No. 1 sealing ball 51 through the fluid entering the conveying chamber 12 to obtain a stable rotational power, and the control rod 7 drives the left sealing mechanism 64 and the right sealing mechanism 65 to rotate coaxially and at the same frequency. When the external device is conveying the fluid, the left sealing mechanism 64 is pushed to open by the flow of the fluid, and the right sealing mechanism 65 is in a closed state, so that the fluid flows along the conveying chamber 12 to the output end 3, pushing the No. 2 sealing ball 63 to move toward the No. 2 stopper 61, and the No. 2 stopper 61 is pushed by the No. 2 spring 62; when the external device stops conveying the fluid, the No. 2 sealing ball 63 is reset due to the elastic pressure of the No. 2 spring 62, and the residual fluid in the check valve is discharged to the output end 3 through the gap between the No. 2 sealing ball 63 and the conveying chamber 12 by its own gravity, and the right sealing mechanism 65 is always in a closed state. When the external device pushes the fluid to flow to the output end 3, the fluid is prevented from flowing to the input end 2, thereby improving the sealing performance of the check valve.

[0042] The left sealing mechanism 64 includes a fixed plate 641, a rotating blade 642, a rotating plate 643 and a turbine blade 644. The fixed plate 641 is installed in the middle of the conveying chamber 12 and close to the No. 2 sealing ball 63. The rotating blade 642 is installed on the right side of the fixed plate 641. The rotating plate 643 is installed on the right side of the rotating blade 642. The rotating plate 643 is in contact with the rotating wheel 56. A fixed groove 6431 is opened on the circumferential surface of the rotating plate 643. A gear 6432 is installed in the fixed groove 6431. One side of the gear 6432 is in contact with the fixed groove 6431, and the middle part of the other side is connected to the fixed groove 6431 through a return spring 6433, thereby realizing rotation. When the plate 643 rotates forward, the rotating groove 561 fits with the gear teeth 6432, and the rotating wheel 56 drives the rotating plate 643 to rotate to realize the expansion of the rotating blades 642, thereby realizing the sealing of the lower end conveying chamber 12. The rotation of the rotating plate 643 drives the rotating blades 642 to expand and contract on the fixed plate 641. The side of the rotating plate 643 away from the rotating blades 642 is connected to the turbine blades 644, and the rotating plate 643 and the turbine blades 644 are coaxially installed to ensure that when the fluid passes through the turbine blades 644, the turbine blades 644 are rotated by the thrust of the fluid, thereby ensuring synchronous rotation, controlling the closing of the rotating blades 642, and improving the sealing performance.

[0043] During operation, the control rod 7 is rotated to drive the rotating wheel 56 to rotate, and the rotating groove 561 on the rotating wheel 56 contacts the gear 6432 in the fixed groove 6431. When the external device extracts fluid, the fluid enters from the input end 2, and the fluid pushes the No. 1 sealing ball 51 to move, so that the control rod 7 rotates at the same frequency as the rotating wheel 56, and the rotating groove 561 fits the inclined surface of the gear 6432, driving the rotating plate 643 to rotate. The rotation of the rotating plate 643 drives the rotating blade 642 to close on the fixed plate 641, thereby achieving the sealing of the output end 3 to prevent the fluid from flowing to the output end 3. When the external device is driven to push the fluid, the fluid is connected by the external device. The fluid flows from end 4 to output end 3. Since the turbine blade 644 is fixedly connected to the rotating plate 643 and the turbine blade 644 fits against the inner wall of the conveying chamber 12, the fluid passes through the turbine blade 644, causing the turbine blade 644 to rotate. The rotation of the turbine blade 644 drives the rotating plate 643 to rotate, and then the rotating blade 642 opens, and the fluid flows to the output end 3. At the same time, the gear teeth 6432 on the rotating plate 643 slide along the rotating groove 561, compressing the reset spring 6433, and then the control rod 7 is not driven to reverse. At this time, the right sealing mechanism 65 is in a closed state. When the fluid flows to the output end 3, it is prevented from flowing to the input end 2, thereby improving the sealing performance and reducing overflow.

[0044] The gear tooth 6432 is in the shape of a teardrop. When the rotating plate 643 is reversed, the teardrop-shaped curved portion fits with the rotating groove 561. An inclined surface consistent with the inclination angle of the rotating groove 561 is provided on the opposite side of the teardrop-shaped curved portion. The curved portion of the teardrop-shaped gear tooth 6432 fits with the rotating groove 561, and the curved portion slides better along the rotating groove 561 to avoid contact with the rotating groove 561. The gear tooth 6432 drives the rotating wheel 56 to rotate. The inclined surface can increase the contact area between the latch tooth 6531 and the rotating groove 561, so that when the rotating wheel 56 drives the rotating plate 643 to rotate, they can fit better and avoid the phenomenon of tooth disengagement of the rotating wheel 56.

[0045] A spoiler blade 521 is installed on the inner side of the moving ring 52, and the spoiler blades 521 are installed in an array at equal intervals around the circumference. The array-mounted spoiler blades 521 change the state of the fluid passing through the moving ring 52, reduce the turbulence of the fluid, and reduce the water hammer phenomenon. A pushing slope is opened at the bottom of the moving ring 52, and the moving ring 52 fits the inner wall of the conveying chamber 12. For impurities in the fluid, the reciprocating motion of the moving ring 52 can reduce the accumulation of impurities and avoid slowing down the flow rate of the fluid.

[0046] An inclined surface is provided on the rotating blade 642, and a guide groove 6421 is provided on the inclined surface of the rotating blade 642. Multiple rotating blades 642 are spliced ​​into a conical surface. The guide groove 6421 is provided on the inclined surface to allow the fluid to flow along its surface, thereby avoiding the fluid directly hitting the surface of the rotating blade 642 to cause hydroplaning, reducing water flow impact, and avoiding gaps between the rotating blades 642. At the same time, the diameter of the conical surface is equal to the diameter of the left end of the conveying chamber 12, which can ensure the sealing performance and avoid fluid overflow, affecting the stability of the device.

[0047] The right sealing mechanism 65 includes a left baffle plate 651, a right baffle plate 652, a rotating ring 653 and a sealing blade 654. The left baffle plate 651 is fixedly installed inside the conveying chamber 12 and is close to the No. 1 baffle block 54. A rotating ring 653 is installed on the right side of the left baffle plate 651. The inner circumferential surface of the rotating ring 653 is provided with an array of latch teeth 6531 at equal intervals, and the outer circumferential surface of the rotating ring 653 is provided with the same latch teeth 6531. The latch teeth 6531 are provided at intervals between the inner and outer sides of the rotating ring 653 to ensure that the sealing blade 654 can be opened and closed while reducing the manufacturing cost of the mechanism. The latch teeth 6531 on the inner side of the rotating ring 653 cooperate with the sealing blade 654, and the latch teeth 6531 on the outer side of the rotating ring 653 cooperate with the gear teeth 6432 on the driving wheel 55, thereby achieving the effect of slowly opening and closing the sealing blade 654 by rotating the control rod 7. The right side of the rotating blade 642 is connected to the right baffle plate 652.

[0048] During operation, the control rod 7 rotates to drive the driving wheel 55 to rotate, and the driving wheel 55 opens the sealing blade 654 through the mutually cooperating latch teeth 6531. When the No. 1 spring 53 is reset to drive the movable ring 52 and the No. 1 sealing ball 51 to move, the control rod 7 is driven to rotate in the opposite direction through the cylindrical protrusion 522, so that the driving wheel 55 rotates in the opposite direction, thereby driving the sealing blade 654 to close, thereby realizing double sealing to improve the sealing effect and avoid overflow.

[0049] A spiral groove 71 is provided on the circumferential surface of the control rod 7, and the spiral groove 71 cooperates with the cylindrical protrusion 522, and drives the moving ring 653 to rotate through the moving ring 52. The length of the spiral groove 71 on the control rod 7 is equal to the distance from the No. 1 sealing ball 51 to the No. 1 stopper 54. The equal distance ensures that when the fluid pushes the No. 1 sealing ball 51, the sealing blade 654 opens accordingly. When the No. 1 sealing ball 51 contacts the No. 1 stopper 54, the sealing blade 654 is fully opened, and at the same time, when it is reset by the elastic force of the reset spring 6433, it can be slowly closed, while ensuring the sealing performance, avoiding the phenomenon of excessive fluid impact force on the check valve.

[0050] The ends of the No. 1 sealing ball 51 and the No. 2 sealing ball 63 that are away from the No. 1 stopper 54 and the No. 2 stopper 61 are respectively concave-convex. The concave-convex surface can increase the contact area between the fluid and the sealing ball, so that the fluid can better push the sealing ball to move, while slowing down the speed of the fluid passing through, avoiding excessive impact force, resulting in excessive gap between the sealing ball and the conveying chamber 12, and reducing the sealing effect. The No. 1 stopper 54 and the No. 2 stopper 61 are both truncated cones, and a flow port 541 is opened at the bottom of the truncated cone, so as to ensure the stability of the operation of the mechanism, and at the same time allow the fluid to flow through the flow port 541 while ensuring the stability of the mechanism.

[0051] Working principle and effect: The staff installs the present application in a vertical pipeline system and connects the external device to the external device connection end 4. When the external device starts to extract fluid, the fluid flows from the input end 2 along the delivery cavity 12 to the inside of the check valve body 1. The fluid pushes the No. 1 sealing ball 51 to move, thereby causing the No. 1 sealing ball 51 and the moving ring 52 to move synchronously toward the No. 1 stopper 54 to compress the No. 1 spring 53. While the moving ring 52 moves, the cylindrical protrusion 522 cooperates with the spiral groove 71 to cause the control rod 7 to rotate. The control rod 7 rotates to drive the driving wheel 55 and the rotating wheel 56 to rotate synchronously on the same axis. The driving wheel 55 rotates to drive the rotating ring 653 to rotate. The rotating ring 653 rotates to open the sealing blade 654, and the fluid can flow normally. The rotating wheel 56 rotates, and the rotating groove 561 cooperates with the gear 6432, thereby driving the rotating plate 643 to rotate, and at the same time, the rotating plate 643 is closed, so that the fluid can flow from the input end 2 to the external device connection end 4, and will not overflow to the output end 3. When the external device starts to push the fluid, the fluid The fluid flows from the external device connection end 4 to the output end 3. At this time, the sealing blade 654 is closed due to the reset of the No. 1 spring 53, which drives the control rod 7 to rotate, so as to realize double sealing of the output end 3 of the check valve body 1. Therefore, the fluid will not flow to the input end 2. When the fluid passes through the turbine blade 644, it drives the turbine blade 644 to rotate. Since the turbine blade 644 is fixedly connected to the rotating plate 643, the rotating plate 643 rotates accordingly. However, when the rotating plate 643 rotates, the latch tooth 6531 is compressed in the rotating groove 561. This rotating wheel 56 will not be driven to rotate. At this time, the sealing blade 654 is in a sealed state, and the rotating blade 642 is driven to open by the rotating plate 643. The fluid pushes the No. 2 sealing ball 63 to compress the No. 2 spring 62 toward the No. 2 block 61, and the fluid flows out through the output end 3. At this time, since the check valve is installed vertically, the fluid inside the check valve body 1 flows toward the output end 3 due to its own gravity. When the external device is extracted again, the rotating blade 642 is closed to seal the fluid on the side close to the output end 3, thereby ensuring its sealing.

[0052] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A safety double check valve for drilling, comprising a check valve body (1), an input end (2), an output end (3) and an external equipment connection end (4), wherein the output end (3) is connected to the left end of the check valve body (1), the input end (2) is connected to the right end of the check valve body (1), and the external equipment connection end (4) is provided in the middle of the check valve body (1), characterized in that: The invention also comprises a control component (5), a sealing component (6) and a control rod (7). The check valve body (1) is used for being installed in a pipeline system, and a circular valve disc is provided inside to prevent fluid backflow. A movement chamber (11) and a conveying chamber (12) are provided inside the check valve body. The diameters of the two ends of the conveying chamber (12) are larger than the middle diameter. The control component (5) is installed in the movement chamber (11), and a control rod (7) is installed in the movement chamber (11). The sealing component (6) is installed in the conveying chamber (12). The control component (5) realizes the rotation of the control rod (7) according to the change of the material in the conveying chamber (12). The sealing component (6) realizes the switching sealing of the input end (2) and the output end (3) when the material changes different paths through the rotation of the control rod (7).

2. The safety double check valve for drilling according to claim 1, characterized in that: The control assembly (5) comprises a No. 1 sealing ball (51), a moving ring (52), a No. 1 spring (53), a No. 1 stopper (54), a driving wheel (55) and a rotating wheel (56). The No. 1 sealing ball (51) is installed inside the conveying chamber (12) and is close to the external device connection end (4). The moving ring (52) is installed on the left side of the No. 1 sealing ball (51). A cylindrical protrusion (522) is provided on the side of the moving ring (52) close to the control rod (7). A No. 1 spring (53) is installed on the left side of the moving ring (52). The other end of the No. 1 spring (53) is connected to the No. 1 stopper (54). A driving wheel (55) is installed on the left side of the No. 1 stopper (54). The driving wheel (55) is installed coaxially with the control rod (7). A rotating wheel (56) is installed on the left side of the driving wheel (55). Rotating grooves (561) are equidistantly provided on the circumferential surface of the rotating wheel (56).

3. The safety double check valve for drilling according to claim 2, characterized in that: The sealing assembly (6) comprises a No. 2 stopper (61), a No. 2 spring (62), a No. 2 sealing ball (63), a left sealing mechanism (64) and a right sealing mechanism (65). The No. 2 stopper (61) is installed inside the conveying chamber (12) and is installed opposite to the No. 1 stopper (54). The No. 2 spring (62) is installed on the right side of the No. 2 stopper (61). One end of the No. 2 spring (62) is connected to the No. 2 stopper (61), and the other end is connected to the No. 2 sealing ball (63). The left sealing mechanism (64) is installed on the right side of the No. 2 sealing ball (63). The right sealing mechanism (65) is installed on the right side of the left sealing mechanism (64), and the left sealing mechanism (64) and the right sealing mechanism (65) are installed coaxially.

4. The safety double check valve for drilling according to claim 3 is characterized in that: The left sealing mechanism (64) comprises a fixed plate (641), a rotating blade (642), a rotating plate (643) and a turbine blade (644). The fixed plate (641) is installed in the middle of the conveying chamber (12) and close to the second sealing ball (63). The right side of the fixed plate (641) is installed with a rotating blade (642). The right side of the rotating blade (642) is installed with a rotating plate (643). The rotating plate (643) is in contact with the rotating wheel (56). The circumferential surface of the rotating plate (643) is provided with a fixed groove (644). 31), a gear (6432) is installed in the fixed groove (6431), one side of the gear (6432) is in contact with the fixed groove (6431), and the middle part of the other side is connected to the fixed groove (6431) through a return spring (6433), the rotating plate (643) rotates to drive the rotating blade (642) to expand and contract on the fixed plate (641), and the side of the rotating plate (643) away from the rotating blade (642) is connected to the turbine blade (644), and the rotating plate (643) and the turbine blade (644) are coaxially installed.

5. The safety double check valve for drilling according to claim 4, characterized in that: The gear teeth (6432) are in the shape of a water drop, and when the rotating plate (643) is reversed, the water drop-shaped curved portion fits into the rotating groove (561), and an inclined surface having the same inclination angle as the rotating groove (561) is provided on the opposite side of the water drop-shaped curved portion.

6. The safety double check valve for drilling according to claim 4, characterized in that: The inner side of the moving ring (52) is provided with spoiler blades (521), and the spoiler blades (521) are arranged in a row and equidistantly around the circumference. A pushing inclined surface is provided below the moving ring (52), and the moving ring (52) is in contact with the inner wall of the conveying chamber (12).

7. The safety double check valve for drilling according to claim 6, characterized in that: The rotating blade (642) is provided with an inclined surface, and a guide groove (6421) is provided on the inclined surface of the rotating blade (642). A plurality of rotating blades (642) are spliced ​​into a conical surface, and the diameter of the conical surface is equal to the diameter of the left end of the conveying cavity (12).

8. The safety double check valve for drilling according to claim 4, characterized in that: The right sealing mechanism (65) comprises a left baffle (651), a right baffle (652), a rotating ring (653) and a sealing blade (654). The left baffle (651) is fixedly installed inside the conveying chamber (12) and close to the No. 1 baffle (54). The rotating ring (653) is installed on the right side of the left baffle (651). The inner circumferential surface of the rotating ring (653) is provided with a uniformly spaced array of latch teeth (6531). The outer circumferential surface of the rotating ring (653) is provided with the same latch teeth (6531). The inner latch teeth (6531) of the rotating ring (653) cooperate with the sealing blade (654). The outer latch teeth (6531) of the rotating ring (653) cooperate with the gear teeth (6432) on the driving wheel (55). The right side of the rotating blade (642) is connected to the right baffle (652).

9. The safety double check valve for drilling according to claim 8, characterized in that: The control rod (7) is provided with a spiral groove (71) on its circumferential surface. The spiral groove (71) matches the cylindrical protrusion (522). The length of the spiral groove (71) on the control rod (7) is equal to the distance from the first sealing ball (51) to the first stopper (54).

10. The safety double check valve for drilling according to claim 9, characterized in that: The ends of the No. 1 sealing ball (51) and the No. 2 sealing ball (63) which are respectively away from the No. 1 stopper (54) and the No. 2 stopper (61) are concave-convex; the No. 1 stopper (54) and the No. 2 stopper (61) are both truncated cone-shaped, and the bottom ends of the truncated cones are provided with flow openings (541).

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