Three-eccentric bidirectional metal-sealed high-performance butterfly valve

Abstract

The present invention relates to the technical field of drilling tools, and provides a three-eccentric bidirectional metal-sealed high-performance butterfly valve, the butterfly valve comprising a valve body, a columnar channel for oil flow is formed in the valve body, an annular valve assembly is installed on the inner wall of the columnar channel, a sealing assembly is provided on the side of the annular valve assembly close to the expanded end of its tapered channel, and a clearance is provided between the valve plate and the annular valve assembly; the present invention is used in drilling operations, and through the setting of the sealing assembly, when the valve body is closed, the outer peripheral surface of the valve plate turns to the flow direction of the oil, and the conical surface of the outer edge of the connecting plate is pushed by the rack to close with the conical surface of the outer edge of the valve seat, thereby enhancing the sealing performance of the valve plate to the columnar channel inside the valve body, and when the valve body is opened, the conical surface of the outer edge of the connecting plate is pulled to separate from the conical surface of the outer edge of the valve seat, thereby increasing the opening and closing area of ​​the valve plate, and through the closure of the valve plate and the connecting plate, the oil flow rate is less affected when the seal is released.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to a valve device for an oil well, and in particular to a triple-eccentric bidirectional metal-sealed high-performance butterfly valve. Background Art

[0002] During drilling operations, valves should be installed at the upper and lower ends of the square drill pipe to prevent overflow and blowout.

[0003] The utility model patent with announcement number CN2764931Y provides a flap-type anti-blocking valve, and its classification number is: E21B34 / 02. It adopts a flap-type structure. Since the sealing surface is in hard contact, its sealing is not tight. Long-term erosion will further damage its sealing structure and cause the valve body to be scrapped prematurely.

[0004] The utility model patent with announcement number CN204002698U provides an arrow-type anti-blocking valve, whose classification number is: E21B34 / 06. It can achieve reliable sealing through two seals of the valve head and the skirt. Even if there are sand particles that have leaked through the filtration amount on the sealing surface, it can still achieve effective sealing under the wrapping of the sealing skirt. At the same time, it also overcomes the defect of the flap-type anti-blocking valve that the flap is easy to fall off. Although it achieves reliable sealing, the opening and closing area is small when the seal is released, which affects the oil flow rate. Summary of the invention

[0005] The object of the present invention is to provide a three-eccentric bidirectional metal-sealed high-performance butterfly valve to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a three-eccentric bidirectional metal-sealed high-performance butterfly valve, comprising a valve body, a columnar channel for oil circulation formed in the valve body, an annular valve assembly installed on the inner wall of the columnar channel, a conical channel on the inner side of the annular valve assembly, and the flared end of the conical channel faces the flow direction of the oil, a sealing assembly is provided on the side of the annular valve assembly close to the flared end of its conical channel, the sealing assembly comprises a valve plate adapted to be in the columnar channel, a valve stem radially arranged along the columnar channel and capable of driving the valve plate to rotate, and a sealing mechanism arranged on the side of the valve plate close to the upper annular valve assembly, a clearance is provided between the valve plate and the annular valve assembly, the sealing mechanism is installed on the valve plate through a position adjustment assembly in a sliding installation manner perpendicular to the valve plate, the sealing mechanism comprises a connecting plate, and the outer edge of the connecting plate is arranged on a conical surface adapted to the conical channel.

[0007] Furthermore, a sealing mechanism is provided on the side of the valve plate close to the oil flow direction, and the sealing mechanism includes a connecting plate, which is provided on the side of the valve plate close to the oil flow direction. The connecting plate is slidably matched with the valve plate through a connecting column and can only slide in a direction perpendicular to the valve plate. The connecting column is provided along a circumferential direction on the outer peripheral surface of the valve plate.

[0008] Furthermore, the position adjustment component includes a gear, a rack and a push block, a gear is provided at one end of the valve stem close to the center of the valve plate, a rack adapted to the gear is provided on the surface of the valve plate, and a push block is provided on the side of the rack close to the oil flow direction, the push block cooperates with the gear through the rack transmission and can only slide in the direction perpendicular to the valve plate, and a support block adapted to the rack is provided on the side of the valve plate close to the valve stem.

[0009] Furthermore, the valve stem includes an inner rod and an outer rod, the outer rod is covered on the outer side of the inner rod near the bottom end of the valve plate, and is rotatably connected to the inner rod, the position adjustment assembly also includes a connecting groove, a trapezoidal block and a fixing groove, a connecting groove is opened on the outer wall of the bottom end of the inner rod, a pressing spring adapted to the trapezoidal block is arranged inside the connecting groove, a bearing seat adapted to the outer rod is arranged at the bottom end of the valve body, a fixing groove adapted to the trapezoidal block is arranged on the inner wall of the bearing seat, and a support spring is fixedly connected inside the fixing groove.

[0010] Furthermore, the valve plate is hollow inside to form a chamber, a limit rod is slidably provided on the outer surface of the valve plate in a circumferential direction, a limit groove adapted to the limit rod is provided inside the columnar channel, the limit rod is radially arranged along the valve plate, a sealing air bag is provided on the side of the valve plate close to the oil flow direction, a ventilation groove adapted to the sealing air bag is provided inside the valve plate, and one end of the ventilation groove is connected to the hollow chamber inside the valve plate.

[0011] Furthermore, a packing is provided at the connection between the valve body and the cylinder, a shaft sleeve is connected to the outer wall of one end of the valve stem, and a thrust ring is fixedly connected to the outer wall of one end of the valve stem.

[0012] Furthermore, the annular valve assembly includes a circular ring, which is installed inside the valve body. A limiting ring is fixedly connected to the inner wall of the valve body. An adjusting bolt is threadedly connected to the surface of the limiting ring, and a valve seat is threadedly connected to the outer wall of one end of the adjusting bolt.

[0013] Furthermore, a rubber ring is arranged on the outer wall of the valve seat.

[0014] Furthermore, the outer edge of the valve seat is provided with a second conical surface adapted to the connecting plate.

[0015] The difference from the prior art is that the beneficial effects of this application are:

[0016] (1) The present invention is used in drilling operations. The three-eccentric bidirectional metal-sealed high-performance butterfly valve has a plugging component. When the valve body is closed, the outer peripheral surface of the valve plate is turned to the direction of oil flow, and the rack pushes the conical surface of the outer edge of the connecting plate and the conical surface of the outer edge of the valve seat to close, thereby enhancing the sealing performance of the valve plate on the columnar channel inside the valve body. When the valve body is opened, the conical surface of the outer edge of the connecting plate is pulled apart from the conical surface of the outer edge of the valve seat, thereby increasing the opening and closing area of ​​the valve plate. The closure of the valve plate and the connecting plate reduces the influence on the oil flow rate when the seal is released.

[0017] (2) The present invention is used in drilling operations. The three-eccentric bidirectional metal-sealed high-performance butterfly valve achieves valve sealing effect by relying on the contact surface pressure of the valve seat through the setting of the annular valve assembly, thereby solving the problem that the traditional soft sealing method is not suitable for high temperature and high pressure environments and is not wear-resistant, and solving the problem that the hard sealing valve plate has poor sealing effect.

[0018] (3) The present invention is used in drilling operations. The three-eccentric bidirectional metal-sealed high-performance butterfly valve can prevent the valve plate from being deformed under fluid pressure and temperature and prevent the valve stem from being misaligned by setting thrust rings on both sides of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the side cross-sectional structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the side appearance structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the valve stem and the outer sleeve cooperating with each other in the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the connection groove and the pressing spring cooperating with each other in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure in which the fixing groove and the supporting spring cooperate with each other in the present invention.

[0024] In the figure: 1. valve body; 2. cylinder; 3. valve stem; 301. inner rod; 302. outer rod; 4. packing; 5. bushing; 6. thrust ring; 7. plugging assembly; 701. gear; 702. connecting groove; 703. pressing spring; 704. valve plate; 705. connecting column; 706. connecting plate; 707. rack; 708. limiting rod; 709. limiting groove; 710. ventilation groove; 711. sealing airbag; 712. supporting block; 713. trapezoidal block; 714. bearing seat; 715. fixing groove; 716. supporting spring; 717. push block; 8. annular valve assembly; 801. circular ring; 802. limiting ring; 803. adjusting bolt; 804. valve seat; 805. rubber ring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1

[0027] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention provides a technical solution: a three-eccentric bidirectional metal-sealed high-performance butterfly valve, comprising a valve body 1, wherein a columnar channel for oil flow is formed in the valve body 1, an annular valve assembly 8 is installed on the inner wall of the columnar channel, the inner side of the annular valve assembly 8 has a conical channel, and the flared end of the conical channel faces the flow direction of the oil, and a plugging assembly 7 is provided on the side of the annular valve assembly 8 close to the flared end of its conical channel, the plugging assembly 7 comprises a valve plate 704 adapted in the columnar channel, a valve stem 3 radially arranged along the columnar channel and capable of driving the valve plate 704 to rotate, and a sealing mechanism arranged on the side of the valve plate 704 close to the upper annular valve assembly 8, a clearance is provided between the valve plate 704 and the annular valve assembly 8, the sealing mechanism is installed on the valve plate 704 through a position adjustment assembly in a sliding installation manner in a direction perpendicular to the valve plate 704, the sealing mechanism comprises a connecting plate 706, and the outer edge of the connecting plate 706 is arranged on a conical surface adapted to the conical channel.

[0028] When in use, the cylinder 2 is started to drive the valve stem 3 to drive the sealing assembly 7 to rotate inside the columnar channel of the valve body 1 for oil circulation, so that the surface of the sealing assembly 7 is closed with the surface of the annular valve assembly 8, thereby sealing the columnar channel. The cylinder 2 drives the valve stem 3 to rotate in the opposite direction to separate the outer periphery of the sealing assembly 7 from the annular valve assembly 8 to release the blockage of the columnar channel.

[0029] See also Figure 3 As shown in the figure, a sealing mechanism is provided on the side of the valve plate 704 close to the oil flow direction, and the sealing mechanism includes a connecting plate 706, which is provided on the side of the valve plate 704 close to the oil flow direction. The connecting plate 706 is slidably matched with the valve plate 704 through a connecting column 705 and can only slide in a direction perpendicular to the valve plate 704. The connecting column 705 is provided on the outer peripheral surface of the valve plate 704 along the circumferential direction.

[0030] When in use, when closing the valve body 1, the cylinder 2 is started to first drive the valve stem 3 to rotate clockwise to push the valve plate 704 to rotate, so that the outer peripheral surface of the valve plate 704 rotates on the side facing the oil flow direction, and then through the rotation of the inner rod 301 and the meshing of the gear 701 and the rack 707, the push block 717 and the connecting plate 706 are pushed to slide on the surface of the connecting column 705 in the direction of oil flow, so that the conical surface of the outer edge of the connecting plate 706 is closed with the conical surface of the outer edge of the valve seat 804, thereby enhancing the sealing performance of the valve plate 704 to the columnar channel inside the valve body 1. When opening the valve body 1, the cylinder 2 The inner rod 301 is driven to rotate counterclockwise, and the connecting plate 706 is pulled to slide on the surface of the connecting column 705 toward the surface of the valve plate 704, so that the conical surface of the outer edge of the connecting plate 706 is separated from the conical surface of the outer edge of the valve seat 804, thereby increasing the opening and closing area of ​​the valve plate 704. Then, the outer rod 302 is driven to rotate counterclockwise by the inner rod 301, and the valve plate 704 and the connecting plate 706 are driven to rotate in a closed state, thereby opening the columnar channel inside the valve body 1. At the same time, through the closure of the valve plate 704 and the connecting plate 706, the oil flow rate is less affected when the seal is released.

[0031] See also Figure 3 As shown in the figure, the position adjustment component includes a gear 701, a rack 707 and a push block 717. The gear 701 is arranged at one end of the valve stem 3 close to the center of the valve plate 704, and the surface of the valve plate 704 is provided with a rack 707 adapted to the gear 701, and a push block 717 is arranged on the side of the rack 707 close to the oil flow direction. The push block 717 is slidably matched with the gear 701 through the rack 707 and can only slide in the direction perpendicular to the valve plate 704, and a support block 712 adapted to the rack 707 is arranged on the side of the valve plate 704 close to the valve stem 3.

[0032] When in use, through the mutual engagement of the gear 701 and the rack 707, the positive and negative rotation of the inner rod 301 can push or pull the rack 707 to slide on the surface of the valve plate 704, and cooperate with the push block 717 to drive the connecting plate 706 to slide on the surface of the connecting column 705. At the same time, the support block 712 supports the sliding of the rack 707, ensures the stability of the rack 707 when sliding, and ensures the engagement of the rack 707 with the gear 701.

[0033] See also Figure 4 and Figure 5As shown in the figure, the valve stem 3 includes an inner rod 301 and an outer rod 302. The outer rod 302 is covered on the outer side of the inner rod 301 near the bottom end of the valve plate 704 and is rotatably connected to the inner rod 301. The position adjustment component also includes a connecting groove 702, a trapezoidal block 713 and a fixing groove 715. A connecting groove 702 is provided on the outer wall of the bottom end of the inner rod 301, and a pressing spring 703 adapted to the trapezoidal block 713 is arranged inside the connecting groove 702. A bearing seat 714 adapted to the outer rod 302 is provided at the bottom end of the valve body 1, and a fixing groove 715 adapted to the trapezoidal block 713 is provided on the inner wall of the bearing seat 714, and a support spring 716 is fixedly connected inside the fixing groove 715.

[0034] When in use, the starting cylinder 2 drives the inner rod 301 to rotate clockwise, and the trapezoidal block 713 is engaged between the connecting groove 702 and the outer rod 302, so that the inner rod 301 can drive the outer rod 302 to rotate synchronously, thereby pushing the outer peripheral surface of the valve plate 704 to rotate on the side facing the oil flow direction. When the outer peripheral surface of the valve plate 704 is facing the oil flow direction, the connecting groove 702 at the bottom of the inner rod 301 and the fixed groove 715 inside the bearing seat 714 are in a mutually perpendicular state. At this time, the pressing spring 703 is subjected to force to push the trapezoidal block 713 to slide downward, so that one end of the trapezoidal block 713 enters the interior of the fixed groove 715, and then the inner rod 3 01 continues to rotate clockwise, and cooperates with the connecting groove 702 to squeeze the inclined surface of the trapezoidal block 713, so that the trapezoidal block 713 is pushed out of the interior of the connecting groove 702, enters the interior of the fixed groove 715 and squeezes the supporting spring 716, thereby releasing the limit of the inner rod 301 and the outer rod 302 and limiting the outer rod 302 and the bearing seat 714, so that the inner rod 301 can rotate independently, and push the connecting plate 706 to slide through the gear 701 and the rack 707, so that the conical surface of the outer edge of the connecting plate 706 is closed with the conical surface of the outer edge of the valve seat 804, and the butterfly valve is closed. When opening the butterfly valve, rotate the valve stem 3 counterclockwise and repeat the above steps.

[0035] See also Figure 3 As shown in the figure, the valve plate 704 is hollow inside to form a cabin, a limit rod 708 is slidably provided on the outer surface of the valve plate 704 along the circumferential direction, a limit groove 709 adapted to the limit rod 708 is provided inside the columnar channel, the limit rod 708 is radially arranged along the valve plate 704, a sealing air bag 711 is provided on the side of the valve plate 704 close to the oil flow direction, a ventilation groove 710 adapted to the sealing air bag 711 is provided inside the valve plate 704, and one end of the ventilation groove 710 is connected to the hollow cabin inside the valve plate 704.

[0036] During use, when the valve plate 704 is opened, the connecting plate 706 slides toward the surface of the valve plate 704 and the push block 717, so that the push block 717 pulls the limiting rod 708 to slide toward the center of the valve plate 704, thereby pulling one end of the limiting rod 708 out from the inside of the limiting groove 709, and releasing the limit on the valve plate 704. At the same time, through the sliding of the push block 717 in the internal chamber of the valve plate 704, the air inside the sealing airbag 711 can be sucked into the interior of the chamber through the ventilation groove 710, causing the sealing airbag 711 to shrink. When closing the valve plate 704, the above steps can be repeated in reverse.

[0037] See also Figure 1 As shown in the figure, a packing 4 is provided at the connection between the valve body 1 and the cylinder 2, a shaft sleeve 5 is connected to the outer wall of one end of the valve stem 3, and a thrust ring 6 is fixedly connected to the outer wall of one end of the valve stem 3.

[0038] When in use, sealing rings are provided between the thrust ring 6 and the valve stem 3, between the shaft sleeve 5 and the valve plate 704, and between the packing 4 and the valve stem 3 to prevent particulate oil from entering the valve stem 3 and the valve plate 704 and causing jamming. The thrust ring 6 can also prevent the valve plate 704 from deforming under fluid pressure and temperature and prevent the valve stem 3 from being misplaced.

[0039] See also Figure 1 and Figure 2 As shown in the figure, the annular valve assembly 8 includes a circular ring 801, which is installed inside the valve body 1. A limiting ring 802 is fixedly connected to the inner wall of the valve body 1. An adjusting bolt 803 is threadedly connected to the surface of the limiting ring 802, and a valve seat 804 is threadedly connected to the outer wall of one end of the adjusting bolt 803.

[0040] When in use, the circular ring 801 can limit the limit ring 802 to ensure the stability of the limit ring 802. The valve seat 804 can be adjusted by rotating the adjusting bolt 803. The valve sealing effect is achieved by relying on the contact surface pressure of the valve seat 804, which solves the problem that the traditional soft sealing method is not suitable for high temperature and high pressure environment and is not wear-resistant. It also solves the problem that the hard sealing valve plate 704 has poor sealing effect.

[0041] See also Figure 1 As shown in the figure, a rubber ring 805 is provided on the outer wall of the valve seat 804.

[0042] The outer edge of the valve seat (804) is provided with a second conical surface to which the connecting plate (706) is adapted.

[0043] When in use, the sealing between the valve seat 804 and the valve body 1 can be ensured by the provision of the rubber ring 805 .

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-eccentric bidirectional metal-sealed high-performance butterfly valve, comprising a valve body (1), characterized in that: The valve body (1) has a columnar channel for oil flow formed therein, an annular valve assembly (8) is installed on the inner wall of the columnar channel, the inner side of the annular valve assembly (8) has a conical channel, and the expanded end of the conical channel faces the flow direction of the oil, the annular valve assembly (8) is provided with a sealing assembly (7) on the side close to the expanded end of the conical channel, the sealing assembly (7) comprises a valve plate (704) adapted in the columnar channel, a valve stem (3) arranged along the radial direction of the columnar channel and capable of driving the valve plate (704) to rotate, and a sealing mechanism arranged on the side of the valve plate (704) close to the annular valve assembly (8), a clearance is provided between the valve plate (704) and the annular valve assembly (8), the sealing mechanism is installed on the valve plate (704) by means of a position adjustment assembly in a sliding installation manner in a direction perpendicular to the valve plate (704), the sealing mechanism comprises a connecting plate (706), the outer edge of the connecting plate (706) is arranged on a conical surface adapted to the conical channel; The connecting plate (706) is arranged on a side of the valve plate (704) close to the oil flow direction, the connecting plate (706) is slidably matched with the valve plate (704) via the connecting column (705) and can only slide in a direction perpendicular to the valve plate (704), and the connecting column (705) is arranged on the outer peripheral surface of the valve plate (704) along the circumferential direction; The position adjustment component comprises a gear (701), a rack (707) and a push block (717); a gear (701) is arranged at one end of the valve stem (3) close to the center of the valve plate (704); a rack (707) adapted to the gear (701) is arranged on the surface of the valve plate (704); a push block (717) is arranged on the side of the rack (707) close to the oil flow direction; the push block (717) is slidably matched with the gear (701) through the rack (707) and can only slide in a direction perpendicular to the valve plate (704); a support block (712) adapted to the rack (707) is arranged on the side of the valve plate (704) close to the valve stem (3); The valve stem (3) comprises an inner rod (301) and an outer rod (302); the outer rod (302) is wrapped around the outer side of the inner rod (301) near the bottom end of the valve plate (704) and is rotatably connected to the inner rod (301); the position adjustment component further comprises a connecting groove (702), a trapezoidal block (713) and a fixing groove (715); a connecting groove (702) is provided on the outer wall at the bottom end of the inner rod (301); a pressing spring (703) adapted to the trapezoidal block (713) is provided inside the connecting groove (702).

2. The triple-eccentric bidirectional metal-sealed high-performance butterfly valve according to claim 1 is characterized in that: A bearing seat (714) adapted to the outer rod (302) is provided at the bottom end of the valve body (1), a fixing groove (715) adapted to the trapezoidal block (713) is provided on the inner wall of the bearing seat (714), and a support spring (716) is fixedly connected inside the fixing groove (715).

3. The triple-eccentric bidirectional metal-sealed high-performance butterfly valve according to claim 2 is characterized in that: The valve plate (704) is hollow inside to form a chamber, a limit rod (708) is slidably arranged on the outer circumferential surface of the valve plate (704) in a circumferential direction, a limit groove (709) adapted to the limit rod (708) is arranged inside the columnar channel, the limit rod (708) is arranged radially along the valve plate (704), a sealing air bag (711) is arranged on the side of the valve plate (704) close to the oil flow direction, a ventilation groove (710) adapted to the sealing air bag (711) is arranged inside the valve plate (704), and one end of the ventilation groove (710) is connected to the hollow chamber inside the valve plate (704).

4. The triple-eccentric bidirectional metal-sealed high-performance butterfly valve according to claim 3 is characterized by: A packing (4) is provided at the connection between the valve body (1) and the cylinder (2), a shaft sleeve (5) is connected to the outer wall of one end of the valve stem (3), and a thrust ring (6) is fixedly connected to the outer wall of one end of the valve stem (3).

5. The triple-eccentric bidirectional metal-sealed high-performance butterfly valve according to claim 4 is characterized in that: The annular valve assembly (8) comprises a circular ring (801), wherein the circular ring (801) is installed inside the valve body (1), a limit ring (802) is fixedly connected to the inner wall of the valve body (1), an adjusting bolt (803) is threadedly connected to the surface of the limit ring (802), and a valve seat (804) is threadedly connected to the outer wall of one end of the adjusting bolt (803).

6. The triple-eccentric bidirectional metal-sealed high-performance butterfly valve according to claim 5 is characterized in that: A rubber ring (805) is provided on the outer wall of the valve seat (804), and a second conical surface adapted to the connecting plate (706) is provided on the outer edge of the valve seat (804).

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