A two-way sealed and self-relieving ultra-low temperature ball valve for natural gas pipelines

Abstract

The present invention relates to the technical field of ball valves, and provides a two-way sealed self-relieving ultra-low temperature ball valve for natural gas pipelines, which includes a valve body. Openings are provided on both the front and rear sides of the valve body. A ball is installed in the middle of the valve body. A valve stem is fixedly connected above the ball. A first bevel gear is fixedly connected above the valve stem. A second bevel gear is meshed and connected to the side of the first bevel gear. A connecting column is fixedly connected to the second bevel gear. A fixing rod is welded above the valve body. A fixing sleeve is welded on the fixing rod. A connecting shell is fixedly connected to the surface of the fixing sleeve. A ring is rotatably installed on the connecting shell, and a clamping component is installed in the ring. Through the above technical solution, the problem that the existing ball valve cannot automatically discharge and relieve the pressure of the fluid in the ball passage when closing the valve, and the long-term retention of high-pressure fluid in the passage will cause the performance of the sealing member to decrease is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and specifically, to a two-way sealed self-relieving cryogenic ball valve for natural gas pipelines. Background Art

[0002] A ball valve is a commonly used fluid control valve that controls the on-off and regulation of fluid through a sphere within a framework. A ball valve typically consists of components such as a valve body, a valve cover, a sphere with a central passage, valve seats, and a valve stem. Ball valves are suitable for a variety of different types of media, including liquids, gases, and steam, and can be used in various industrial and commercial applications. However, there are still some deficiencies in the existing ball valves during use.

[0003] For example, Chinese Patent No. CN110242770B discloses a three-way ball valve. When a working position conversion is required, first control the driving mechanism to drive each through-hole ball flap to retract into its corresponding first circular groove, and at the same time drive the sealing ball flap to retract into the second circular groove. Then, rotate the sphere through the valve stem to the required working position. Finally, control the driving mechanism to act in the reverse direction to drive each through-hole ball flap to extend out of its corresponding first circular groove and press tightly in the mounting hole or through-hole, and at the same time drive the sealing ball flap to extend out of the mounting hole or through-hole in the second circular groove; although this ball valve can avoid wear during rotation, it cannot automatically discharge and relieve the fluid in the sphere passage when the valve is closed. The long-term retention of high-pressure fluid in the passage will reduce the performance of the sealing components, thereby increasing the maintenance cost of the ball valve. Summary of the Invention

[0004] The present invention provides a two-way sealed self-relieving cryogenic ball valve for natural gas pipelines, which solves the problem that the existing ball valve cannot automatically discharge and relieve the fluid in the sphere passage when the valve is closed. The long-term retention of high-pressure fluid in the passage will reduce the performance of the sealing components, thereby increasing the maintenance cost of the ball valve.

[0005] The technical solution of the present invention is as follows:

[0006] A two-way sealed self-relieving ultra-low temperature ball valve for natural gas pipelines, comprising a valve body. Openings are provided on both the front and rear sides of the valve body. A sphere is installed in the middle of the valve body. A valve stem is fixedly connected above the sphere. A first bevel gear is fixedly connected above the valve stem. A second bevel gear is meshed and connected to the side of the first bevel gear. A connecting column is fixedly connected to the second bevel gear. A fixing rod is welded above the valve body. A fixing sleeve is welded on the fixing rod. A connecting shell is fixedly connected to the surface of the fixing sleeve. A circular ring is rotatably installed on the connecting shell. A clamping component is installed in the circular ring. Connecting rods are fixedly arranged around the circular ring. A connecting disc is installed at the front end of the connecting rod. A handwheel is installed on the connecting disc. An energy storage spring is connected between the handwheel and the connecting column. An opening opening and closing component is installed on the outer side of the valve body. A first guide ring is installed inside the sphere. Docking blocks that cooperate with the first guide ring to position the first guide ring are slidably installed on both the upper and lower sides of the sphere. A compression spring is fixedly connected between the docking block and the sphere; the handwheel is adapted to be rotated to open or close the opening through the opening opening and closing component.

[0007] As a preferred solution of the present invention, the valve body includes a heat insulation layer fixedly installed on the outer side of the pipe body. A protective layer is fixedly arranged on the outer side of the heat insulation layer. The material of the heat insulation layer is fluororubber, and the material of the protective layer is galvanized stainless steel.

[0008] As a preferred solution of the present invention, the outer wall of the sphere fits with the inner wall of the valve body, and the central axes of the sphere, the valve stem, and the first bevel gear are collinear.

[0009] As a preferred solution of the present invention, the fixing rod, the fixing sleeve, the connecting shell, and the valve body are an integral whole, and the valve stem and the fixing sleeve are rotatably connected.

[0010] As a preferred solution of the present invention, the circular ring, the connecting rod, the connecting disc, and the handwheel are fixedly connected into an integral structure.

[0011] As a preferred solution of the present invention, the clamping component includes a fixing disc fixedly installed on the connecting shell. A clamping block is slidably installed inside the fixing disc. The connecting column is provided with clamping grooves along the circumferential direction. A spring is connected between the clamping block and the fixing disc. A pulling rope is fixedly connected to the clamping block. A damping rotating ring is fixedly connected to the side of the pulling rope away from the connecting column.

[0012] As a preferred solution of the present invention, the damping rotating ring and the connecting shell are rotatably connected. The damping rotating ring and the circular ring are in frictional contact with each other and have a damping force therebetween. The connecting column forms a rotating structure with the fixing disc through the handwheel and the energy storage spring.

[0013] As a preferred solution of the present invention, the opening and closing assembly includes fixing brackets fixedly installed on the front and rear sides of the valve body. A first sealing plate is slidably installed on the fixing bracket on the front side, and a second sealing plate is slidably installed on the fixing bracket on the rear side. A first traction steel cable is bolted to the first sealing plate, and the upper part of the first traction steel cable is wound and installed on the handwheel. A second traction steel cable is fixedly connected to the second sealing plate, and an extension plate is fixedly connected to the first sealing plate. The front end of the second traction steel cable is connected to the extension plate. A guide wheel for guiding the second traction steel cable is rotatably installed on the valve body. One end of the second traction steel cable is connected to the upper part of the second sealing plate, and the other end of the second traction steel cable is connected to the extension plate after passing around the guide wheel. Fixed blocks are fixedly installed on both the first sealing plate and the second sealing plate. Through holes adapted to communicate with the corresponding openings are respectively formed in the first sealing plate and the fixed block thereon, and the second sealing plate and the fixed block thereon. Bellows communicating with the corresponding through holes are installed on the fixed blocks.

[0014] As a preferred solution of the present invention, a tension spring is connected between the first sealing plate and the second sealing plate, and the widths of both the first sealing plate and the second sealing plate are greater than the width of the opening.

[0015] As a preferred solution of the present invention, a first guide ring is installed inside the sphere. Docking blocks that cooperate with the first guide ring to position the first guide ring are slidably installed on both the upper and lower sides of the sphere. Compression springs are fixedly connected between the docking blocks and the sphere.

[0016] As a preferred solution of the present invention, the first guide ring includes an adapter ring fitted to the inner wall of the sphere. Docking grooves for docking with the docking blocks are formed on both the upper and lower sides of the adapter ring. A sliding rod is slidably installed inside the adapter ring. One end of the sliding rod is adapted to extend into the corresponding docking groove and contact the corresponding docking block. A pushing part is provided between the sliding rod and the docking block. The sliding rod is adapted to be pushed through the pushing part so that the corresponding docking block disengages from the corresponding docking groove. The thickness of the adapter ring decreases from the middle to both sides in the axial direction.

[0017] Furthermore, an inner tube for pushing the sliding rod is provided on the left side of the first guide ring.

[0018] The working principle and beneficial effects of the present invention are as follows:

[0019] Through the provided opening and closing component, during the process of rotating the handwheel, the device can pull the first sealing plate upward through the first traction steel cable, and pull the second traction steel cable through the extension plate, causing the second traction steel cable to pull the second sealing plate upward. As a result, during the process of rotating the sphere, the duct in the middle of the sphere can be interconnected with the outside of the device through the opening. Furthermore, when the device is sealed, the fluid in the sphere duct can be discharged, thereby achieving the function of pressure reduction. This solves the defect that the existing ball valves cannot automatically discharge the fluid in the sphere duct and relieve pressure when closing the valve. The device can prevent the situation where the long-term retention of high-pressure fluid in the sphere duct leads to a reduction in the performance of the sealing components, and has the advantage of lower maintenance requirements.

[0020] Through the engaging component on the device, during the process of rotating the handwheel, the pull rope will first pull the clamping block out of the internal card slot, and then under the pulling force of the spring, the clamping block will be stuck into the corresponding card slot, enabling the device to adjust and fix the rotation angle of the connecting column. Thus, the device can accurately adjust the rotation angle of the sphere duct in the ball valve, enhancing the adjustable degree of the device.

[0021] Through the provided first guiding ring with a thickness decreasing from the middle to both sides, when the duct in the sphere of the ball valve corresponds to the position of the opening, the fluid in the sphere can flow out along the conical surface in the first guiding ring, solving the defect that the fluid in the duct of the existing ball valve is prone to residue. Brief Description of the Drawings

[0022] The following further elaborates on the present invention in detail in conjunction with the drawings and specific embodiments.

[0023] Figure 1 is the overall structural schematic diagram of a two-way sealing self-relieving ultra-low temperature ball valve for a natural gas pipeline in the present invention;

[0024] Figure 2 is the split structural schematic diagram of the valve body and the opening and closing component of the present invention;

[0025] Figure 3 is the connection structural schematic diagram of the valve body and the opening and closing component of the present invention;

[0026] Figure 4 is the connection structural schematic diagram of the first bevel gear and the second bevel gear of the present invention;

[0027] Figure 5 is the connection structural schematic diagram of the fixed sleeve and the connection shell of the present invention;

[0028] Figure 6 is Figure 5 the structural schematic diagram at position A in

[0029] Figure 7It is a schematic diagram of the internal structure of the valve body of the present invention;

[0030] Figure 8 is Figure 7 a schematic diagram of the structure at position B in

[0031] Figure 9 It is a schematic diagram of the split structure of the connection disk and the first guide ring of the present invention;

[0032] Figure 10 It is a schematic diagram of the connection structure between the circular ring and the connecting rod of the present invention.

[0033] Reference numerals: 1. Valve body; 101. Pipe body; 102. Heat preservation layer; 103. Protective layer; 2. Inner pipe; 3. Opening; 4. Sphere; 5. Valve rod; 6. First bevel gear; 7. Second bevel gear; 8. Connecting column; 9. Fixed rod; 10. Fixed sleeve; 11. Connecting shell; 12. Circular ring; 13. Connecting rod; 14. Connection disk; 15. Handwheel; 16. Energy storage spring; 17. Clamping component; 1701. Fixed disk; 1702. Clamping block; 1703. Card slot; 1704. Spring; 1705. Pulling rope; 1706. Damping rotating ring; 18. Opening and closing component; 1801. Fixed frame; 1802. First sealing plate; 1803. Second sealing plate; 1804. First traction steel rope; 1805. Second traction steel rope; 1806. Extension plate; 1807. Tightening spring; 1808. Fixed block; 1809. Through hole; 1810. Bellows; 19. First guide ring; 1901. Connecting ring; 1902. Docking groove; 1903. Slide bar; 20. Second guide ring; 21. Docking block; 22. Compression spring; 23. Guide wheel. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0035] Embodiment 1: As Figures 1 - 10As shown in the figure, this embodiment proposes a two-way sealed self-relieving ultra-low temperature ball valve for natural gas pipelines, which includes a valve body 1. Openings 3 are provided on both the front and rear sides of the valve body 1. A sphere 4 is installed in the middle of the valve body 1. When the hole of the sphere 4 rotates to correspond to the position of the opening 3, the ball valve as a whole can remain closed, and at the same time, the residual fluid in the sphere 4 can be discharged through the opening 3. A valve stem 5 is fixedly connected above the sphere 4, a first bevel gear 6 is fixedly connected above the valve stem 5, a second bevel gear 7 is meshed and connected to the side of the first bevel gear 6, a connecting column 8 is fixedly connected to the second bevel gear 7, a fixed rod 9 is welded above the valve body 1, a fixed sleeve 10 is welded on the fixed rod 9, a connecting shell 11 is fixedly connected to the surface of the fixed sleeve 10, a ring 12 is rotatably installed on the connecting shell 11, a clamping component 17 is installed in the ring 12, connecting rods 13 are fixedly arranged around the ring 12, a connecting plate 14 is installed at the front end of the connecting rod 13, a handwheel 15 is installed on the connecting plate 14, and an energy storage spring 16 is connected between the handwheel 15 and the connecting column 8. An opening opening and closing component 18 is installed outside the valve body 1. During the process of rotating the handwheel 15, it can act on the opening opening and closing component 18, so that the originally blocked opening 3 is automatically opened, thus realizing the function of automatically opening the opening 3 during the process of closing the ball valve, enabling the ball valve to automatically discharge the fluid in the hole of the sphere 4 when closing, and thus realizing the function of automatically reducing the air pressure in the internal hole of the sphere 4 after closing the valve. When adjusting the angle of the sphere 4, the second bevel gear 7 is driven to rotate by the connecting column 8, and the second bevel gear 7 rotates to drive the first bevel gear 6 to rotate, so that the valve stem 5 and the sphere 4 rotate. During the adjustment process, the handwheel 15 rotates and first pulls the energy storage spring 16, and the ring 12 at the rear side of the connecting rod 13 acts on the clamping component 17, so that the connecting column 8 is disengaged from the clamping state of the clamping component 17. At this time, under the pulling force of the energy storage spring 16, the connecting column 8 rotates until the connecting column 8 is engaged with the clamping component 17 again, realizing the function of precisely adjusting the angle of the sphere 4.

[0036] A first guide ring 19 is installed inside the sphere 4. Docking blocks 21 that cooperate with the first guide ring 19 to position the first guide ring 19 are slidably installed on both the upper and lower sides of the sphere 4. A compression spring 22 is fixedly connected between the docking block 21 and the sphere 4. When discharging the residual fluid, the first guide ring 19 can guide the fluid, making the fluid discharge more convenient.

[0037] Embodiment 2: As Figures 1 - 9 shown, this embodiment also proposes a two-way sealed self-relieving ultra-low temperature ball valve for natural gas pipelines, and has the following structure on the basis of Embodiment 1:

[0038] In this embodiment, the valve body 1 includes a heat-insulating layer 102 fixedly installed outside the pipe body 101. A protective layer 103 is fixedly arranged outside the heat-insulating layer 102. The heat-insulating layer 102 is made of fluororubber, and the protective layer 103 is made of galvanized stainless steel. The protective layer 103 made of galvanized stainless steel can improve the overall anti-corrosion performance of the device, and fluororubber can improve the heat-insulating performance of the device, which is suitable for use in a low-temperature state.

[0039] In this embodiment, the outer wall of the sphere 4 is in mutual contact with the inner wall of the valve body 1. The central axes of the sphere 4, the valve stem 5, and the first bevel gear 6 are collinear, ensuring the overall stability of the device. The mutually contacting sphere 4 and valve body 1 enable the front and rear sides of the valve body 1 to be in a closed state when the hole in the sphere 4 is perpendicular to the cross-section of the valve body 1.

[0040] In this embodiment, the fixing rod 9, the fixing sleeve 10, the connecting shell 11, and the valve body 1 are an integral whole. The valve stem 5 and the fixing sleeve 10 are rotatably connected, and the valve stem 5 can rotate smoothly inside the fixing sleeve 10. The fixing sleeve 10 can stably support the valve stem 5 through the fixing rod 9, ensuring the smoothness of the device during operation.

[0041] In this embodiment, the ring 12, the connecting rod 13, the connecting disk 14, and the handwheel 15 are fixedly connected into an integral structure. The energy storage spring 16 enables the handwheel 15 to accumulate torque on the connecting column 8 when rotating, so as to make the connecting column 8 rotate after the connecting column 8 is disengaged from the engaged state.

[0042] In this embodiment, the engaging component 17 includes a fixing disk 1701 fixedly installed on the connecting shell 11. A clamping block 1702 is slidably installed inside the fixing disk 1701. The connecting column 8 is circumferentially provided with a clamping groove 1703. A spring 1704 is connected between the clamping block 1702 and the fixing disk 1701. A pulling rope 1705 is fixedly connected to the clamping block 1702. One side of the pulling rope 1705 away from the connecting column 8 is fixedly connected to a damping rotating ring 1706. When the damping rotating ring 1706 rotates, it can pull the pulling rope 1705, and the pulling rope 1705 pulls the clamping block 1702 to disengage the clamping block 1702 from the inside of the clamping groove 1703, and the spring 1704 is compressed. At this time, the connecting column 8 and the fixing disk 1701 are disengaged from the engaged state. At this time, the connecting column 8 rotates again until the connecting column 8 is engaged again, so that the device can adjust and fix the angle of the connecting column 8.

[0043] In this embodiment, the damping swivel ring 1706 and the connecting shell 11 are rotatably connected. The damping swivel ring 1706 is in frictional contact with the circular ring 12 and there is a damping force therebetween. The connecting column 8 forms a rotating structure with the fixed disk 1701 through the handwheel 15 and the energy storage spring 16. The energy storage spring 16 can accumulate torque first when the handwheel 15 is rotated, so as to automatically rotate the connecting column 8 after the connecting column 8 disengages from the engagement. The damping swivel ring 1706 can rotate synchronously when the circular ring 12 rotates. After the damping swivel ring 1706 rotates, as the rotational resistance gradually increases, the circular ring 12 will slip and rotate on the outside of the damping swivel ring 1706, thereby precisely adjusting the angle of the connecting column 8.

[0044] In this embodiment, the opening and closing assembly 18 includes fixed frames 1801 fixedly installed on the front and rear sides of the valve body 1. A first sealing plate 1802 is slidably installed on the front fixed frame 1801, and a second sealing plate 1803 is slidably installed on the rear fixed frame 1801. A first traction steel cable 1804 is bolted to the first sealing plate 1802. The upper part of the first traction steel cable 1804 is wound and installed on the handwheel 15. A second traction steel cable 1805 is fixedly connected to the second sealing plate 1803. An extension plate 1806 is fixedly connected to the upper part of the first sealing plate 1802. A guide wheel 23 for guiding the second traction steel cable 1805 is rotatably installed on the valve body 1. One end of the second traction steel cable 1805 is connected to the upper part of the second sealing plate 1803, and the other end of the second traction steel cable 1805 bypasses the guide wheel 23 and is connected to the extension plate 1806. When the handwheel 15 rotates, it will pull the first traction steel cable 1804, and the first traction steel cable 1804 will pull the first sealing plate 1802 to move upward with the axis of the valve body 1 as the center of the circle. The extension plate 1806 pulls the second traction steel cable 1805. The guide wheel 23 can reduce the wear of the second traction steel cable 1805 when the second traction steel cable 1805 is pulled, thereby ensuring the durability of the device. The second traction steel cable 1805 pulls the second sealing plate 1803, and the second sealing plate 1803 also moves upward with the axis of the valve body 1 as the center of the circle, so that the device can open the opening 3 to discharge the fluid, realizing the function of automatically discharging the remaining fluid after the ball valve is closed. Fixed blocks 1808 are fixedly installed on both the first sealing plate 1802 and the second sealing plate 1803. Through holes 1809 adapted to communicate with the corresponding opening 3 are respectively formed on the first sealing plate 1802 and the fixed block 1808 thereon and on the second sealing plate 1803 and the fixed block 1808 thereon. Bellows 1810 communicating with the corresponding through holes 1809 are installed on the fixed blocks 1808. During the process of discharging the remaining fluid, a sealing structure can be externally connected to the bellows 1810, so that the device can discharge the fluid in a closed state to ensure the safety of the device during use.

[0045] In this embodiment, a tension spring 1807 is connected between the first sealing plate 1802 and the second sealing plate 1803. The widths of the first sealing plate 1802 and the second sealing plate 1803 are both greater than the width of the opening 3. After the first sealing plate 1802 and the second sealing plate 1803 are pulled upward, the tension spring 1807 can maintain a stretched state to facilitate the subsequent reset of the first sealing plate 1802 and the second sealing plate 1803.

[0046] In this embodiment, the first guide ring 19 includes an adapter ring 1901 fitted and installed on the inner wall of the sphere 4. Docking grooves 1902 for docking with corresponding docking blocks 21 are formed on both the upper and lower sides of the adapter ring 1901. A sliding rod 1903 is slidably installed inside the adapter ring 1901. One end of the sliding rod 1903 is adapted to extend into the corresponding docking groove 1902 and contact the corresponding docking block 21. A pushing portion is provided between the sliding rod 1903 and the docking block 21. The sliding rod 1903 is adapted to be pushed through the pushing portion so that the corresponding docking block 21 disengages from the corresponding docking groove 1902. The thickness of the adapter ring 1901 decreases gradually from the middle to both sides in the axial direction.

[0047] Further, an inner tube 2 for pushing the sliding rod 1903 is provided on the left side of the first guide ring 19. As Figure 9 shown, when the device is in use, a second guide ring 20 with different middle thicknesses can also be used to replace the first guide ring 19, so that the device can use guide rings with different middle thicknesses for fluid guiding work for different fluid media during the working process. When replacing, by pushing the inner tube 2, the inner tube 2 abuts against the sliding rod 1903, and the sliding rod 1903 will abut against the docking block 21, so that the adapter ring 1901 can be disengaged from the engaged state, thus realizing the function of convenient disassembly and assembly of the first guide ring 19.

[0048] Specifically, first, as Figures 1 - 8 shown, when the device is working, by rotating the handwheel 15, the first traction steel cable 1804 will be wound around the surface of the handwheel 15 when the handwheel 15 rotates. The first traction steel cable 1804 pulls the first sealing plate 1802 to drive the first sealing plate 1802 to move upward. At the same time, the extension plate 1806 will pull the second sealing plate 1803 to move upward through the second traction steel cable 1805, so that the first sealing plate 1802 and the second sealing plate 1803 move upward simultaneously, and at this time the opening 3 is opened.

[0049] As Figures 4 - 10As shown, since the circular ring 12, the connecting rod 13, the connecting plate 14 and the handwheel 15 are fixedly connected as an integral structure, when the handwheel 15 rotates, the circular ring 12, the connecting rod 13 and the connecting plate 14 rotate synchronously, and the energy storage spring 16 is stretched. Due to the resistance between the circular ring 12 and the damping rotating ring 1706, the rotation of the circular ring 12 will drive the damping rotating ring 1706 to rotate. When the damping rotating ring 1706 rotates, it will pull the latch 1702 through the pull rope 1705, causing the latch 1702 to slide towards the outside of the corresponding card slot 1703, and the spring 1704 is compressed. The resistance for the damping rotating ring 1706 to continue rotating increases, so that the resistance between the circular ring 12 and the damping rotating ring 1706 is insufficient to drive the damping rotating ring 1706 to continue rotating. After the latch 1702 disengages from the inside of the card slot 1703, the connecting column 8 and the fixed disk 1701 are disengaged from the engaged state. The connecting column 8 rotates under the pulling force of the energy storage spring 16 until the card slot 1703 corresponds to the next latch 1702, enabling the device to adjust and fix the angle of the connecting column 8. When the connecting column 8 rotates, it will drive the first bevel gear 6 to rotate through the second bevel gear 7, thereby causing the sphere 4 and the valve stem 5 to rotate. After the sphere 4 rotates 90°, the passage in the sphere 4 is perpendicular to the axis of the valve body 1 and is connected to the opening 3. At this time, the left and right sides of the inner tube 101 in the valve body 1 are in a closed state, realizing the function of reducing the high pressure in the sphere 4, enabling the device to automatically reduce the air pressure inside the sphere 4 after closing the valve. Therefore, when the handwheel 15 rotates, the connecting column 8 will rotate with a delay until the passage in the connecting ring 1901 on the sphere 4 corresponds to the opening 3, and the through hole 1809 on the fixed block 1808 exactly corresponds to the opening 3. At this time, automatic pressure relief can be achieved. Subsequently, by rotating the handwheel 15 in the reverse direction, the sphere 4 can be automatically reset to Figure 2 the state in, and the first sealing plate 1802 and the second sealing plate 1803 will automatically reset to Figure 2 the state in under the action of the tension spring 1807 for the next use.

[0050] As Figure 5 , Figure 6 and Figure 10As shown, when the device closes the orifice of the sphere 4, since the thickness of the first guide ring 19 and the second guide ring 20 decreases from the middle to both sides, the device can conveniently discharge the medium in the orifice of the sphere 4, and the first guide ring 19 and the second guide ring 20 with different middle thicknesses can be used as needed. The device can push the inner tube 2, and through the inner tube 2, the sliding rod 1903 is pushed. The sliding rod 1903 pushes the docking block 21, and the docking block 21 is compressed into the interior of the sphere 4, and the compression spring 22 is compressed. When the sliding rod 1903 is pushed to the limit position, only the hemispherical structure of the docking block 21 is located inside the docking groove 1902, and the cylindrical part of the docking block 21 is completely located in the sphere 4. At this time, continuing to push the inner tube 2 will push the connection ring 1901, so that the inner wall of the docking groove 1902 squeezes the docking block 21, and the docking block 21 is compressed into the interior of the sphere 4, thereby realizing the function of pushing out the connection ring 1901, enabling the device to conveniently replace the first guide ring 19 or the second guide ring 20 with different thicknesses.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A two-way sealed self-relieving cryogenic ball valve for natural gas pipelines, comprising a valve body (1), characterized in that: Both the front and rear sides of the valve body (1) are provided with openings (3). A sphere (4) is installed in the middle of the valve body (1). A valve stem (5) is fixedly connected above the sphere (4). A first bevel gear (6) is fixedly connected above the valve stem (5). A second bevel gear (7) is meshed and connected to the side of the first bevel gear (6). A connecting column (8) is fixedly connected to the second bevel gear (7). A fixing rod (9) is welded above the valve body (1). A fixing sleeve (10) is welded to the fixing rod (9). A connecting shell (11) is fixedly connected to the surface of the fixing sleeve (10). A ring (12) is rotatably installed on the connecting shell (11). A clamping component (17) is installed in the ring (12). Connecting rods (13) are fixedly arranged around the ring (12). A connecting disc (14) is installed at the front end of the connecting rod (13). A handwheel (15) is installed on the connecting disc (14). An energy storage spring (16) is connected between the handwheel (15) and the connecting column (8). An opening opening and closing component (18) is installed outside the valve body (1). A first guide ring (19) is installed inside the sphere (4). Docking blocks (21) that cooperate with the first guide ring (19) to position the first guide ring (19) are slidably installed on both the upper and lower sides of the sphere (4). A compression spring (22) is fixedly connected between the docking block (21) and the sphere (4). The handwheel (15) is adapted to be rotated to open or close the opening (3) through the opening opening and closing component (18); wherein, during the process of rotating the handwheel (15), an action is exerted on the opening opening and closing component (18) to automatically open the blocked opening (3), so as to automatically open the opening (3) during the process of closing the ball valve.

2. The two-way sealed self-relieving cryogenic ball valve for natural gas pipelines according to claim 1, characterized in that, The valve body (1) includes a heat insulation layer (102) fixedly installed on the outer side of the pipe body (101). A protective layer (103) is fixedly arranged on the outer side of the heat insulation layer (102). The heat insulation layer (102) is made of fluororubber, and the protective layer (103) is made of galvanized stainless steel.

3. The bi-directional sealing and self-pressure-relieving cryogenic ball valve for natural gas pipelines according to claim 1, wherein The outer wall of the sphere (4) is mutually attached to the inner wall of the valve body (1). The central axes of the sphere (4), the valve stem (5) and the first bevel gear (6) are collinear.

4. A two-way sealed self-relieving cryogenic ball valve for natural gas pipelines according to claim 1, characterized in that, The clamping component (17) includes a fixed disc (1701) fixedly installed on the connecting shell (11). A clamping block (1702) is slidably installed inside the fixed disc (1701). The connecting column (8) is provided with clamping grooves (1703) along the circumferential direction. A spring (1704) is connected between the clamping block (1702) and the fixed disc (1701). A pull rope (1705) is fixedly connected to the clamping block (1702). A damping rotating ring (1706) is fixedly connected to the side of the pull rope (1705) away from the connecting column (8).

5. The two-way sealing and self-relieving cryogenic ball valve for natural gas pipelines according to claim 4, characterized in that, A rotational connection is provided between the damping swivel ring (1706) and the connection housing (11). Frictional contact exists between the damping swivel ring (1706) and the circular ring (12), with a damping force therebetween. A rotational structure is formed between the connecting column (8), the handwheel (15), the energy storage spring (16), and the fixed disk (1701).

6. The bi-directional sealing and self-pressure-relieving cryogenic ball valve for natural gas pipelines according to claim 1, wherein, The opening and closing assembly (18) includes fixed brackets (1801) fixedly installed on the front and rear sides of the valve body (1). A first sealing plate (1802) is slidably installed on the front-side fixed bracket (1801), and a second sealing plate (1803) is slidably installed on the rear-side fixed bracket (1801). A first towing steel cable (1804) is bolted to the first sealing plate (1802). The upper part of the first towing steel cable (1804) is wound and installed on the handwheel (15). A second towing steel cable (1805) is fixedly connected to the second sealing plate (1803). An extension plate (1806) is fixedly connected to the first sealing plate (1802). A guide wheel (23) for guiding the second towing steel cable (1805) is rotatably installed on the valve body (1). One end of the second towing steel cable (1805) is connected to the upper part of the second sealing plate (1803), and the other end of the second towing steel cable (1805) bypasses the guide wheel (23) and is connected to the extension plate (1806).

7. A two-way sealed self-relieving cryogenic ball valve for natural gas pipelines according to claim 6, characterized in that, Fixed blocks (1808) are fixedly installed on both the first sealing plate (1802) and the second sealing plate (1803). Through holes (1809) adapted to communicate with the corresponding openings (3) are respectively formed in the first sealing plate (1802) and the fixed block (1808) thereon, and in the second sealing plate (1803) and the fixed block (1808) thereon. Bellows (1810) communicating with the corresponding through holes (1809) are installed on the fixed blocks (1808).

8. A two-way sealed self-relieving cryogenic ball valve for natural gas pipelines according to claim 7, characterized in that, A tension spring (1807) is connected between the first sealing plate (1802) and the second sealing plate (1803). The widths of both the first sealing plate (1802) and the second sealing plate (1803) are greater than the width of the opening (3).

9. A two-way sealed self-relieving cryogenic ball valve for natural gas pipelines according to claim 1, characterized in that, A first guide ring (19) is installed inside the sphere (4). Docking blocks (21) that cooperate with the first guide ring (19) to position the first guide ring (19) are slidably installed on both the upper and lower sides of the sphere (4). Compression springs (22) are fixedly connected between the docking blocks (21) and the sphere (4).

10. A two-way sealed self-relieving cryogenic ball valve for natural gas pipelines according to claim 9, characterized in that, The first guiding ring (19) includes an adapter ring (1901) fittingly mounted on the inner wall of the sphere (4). Docking grooves (1902) for docking with the docking blocks (21) are formed on both the upper and lower sides of the adapter ring (1901). A sliding rod (1903) is slidably mounted inside the adapter ring (1901). One end of the sliding rod (1903) is adapted to extend into the corresponding docking groove (1902) and contact the corresponding docking block (21). A pushing portion is provided between the sliding rod (1903) and the docking block (21). The sliding rod (1903) is adapted to be pushed through the pushing portion so that the corresponding docking block (21) disengages from the corresponding docking groove (1902). The thickness of the adapter ring (1901) decreases gradually from the middle to both sides in the axial direction.

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