An online replaceable double-disc ball valve

Abstract

The present invention discloses an online replaceable double-disc ball valve. The key points of its technical solution include a ball valve body, a fixed bracket fixedly connected to the upper and lower ends of the ball valve body, and a lower end cover. A valve seat and a valve core assembly are arranged inside the ball valve body. A valve rod assembly is inserted through the ball valve body, and a driving device is arranged at the upper end of the valve rod assembly. The valve rod assembly includes a matching upper valve rod and a lower valve rod. A polygonal rod is arranged at the lower end of the upper valve rod. A ball valve upper cavity and a ball valve lower cavity are respectively arranged on the upper and lower sides of the ball valve body. A replacement sliding groove is opened on the inner wall of the ball valve upper cavity, and a replacement limiting rod is inserted through the replacement sliding groove. The valve core assembly includes an upper ball disc and a lower ball disc for replacement. The upper ball disc and the lower ball disc move up and down through the valve rod assembly and the replacement sliding groove to complete online replacement. The present invention has the effects of convenient use, online replaceable ball discs, and avoiding shutdown for maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to an on-line replaceable double-valve-disc ball valve. Background Art

[0002] A ball valve is a valve in which the closing member (ball) is driven by a valve stem and rotates around the axis of the ball valve. It can also be used for the regulation and control of fluids. Among them, the hard-sealed V-type ball valve has a strong shearing force between its V-type ball core and the metal valve seat surfacing with hard alloy, and is especially suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, shunt, and flow direction switching of the medium on the pipeline, but also close any channel to connect the other two channels. Ball valves are classified according to the driving method into: pneumatic ball valves, electric ball valves, and manual ball valves.

[0003] In the existing ball valves, especially the hard-sealed ball valves, during the use process, the surface of the valve disc is prone to wear, resulting in a gap between the sealing surface of the valve seat and leakage. Once leakage occurs, it is necessary to stop work to disassemble the valve for repair or replacement to avoid affecting subsequent production operations.

[0004] However, in some working conditions, it is very difficult to stop work to replace the equipment. If work is stopped, it will cause significant losses of materials and related products. Therefore, it is very necessary to design a valve with a spare valve disc and capable of replacing the valve disc on-line, which has extremely high market value. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the present invention provides an on-line replaceable double-valve-disc ball valve, which has the effects of convenient use, on-line replaceable valve disc, and avoiding shutdown for maintenance.

[0006] To achieve the above object, the present invention provides the following technical solution: An online replaceable double-disc ball valve, which includes a ball valve body, a fixed bracket and a lower end cover fixedly connected to the upper and lower ends of the ball valve body. Corresponding inlet and outlet ends are respectively arranged on the left and right sides of the ball valve body. A valve seat and a valve core assembly adapted to each other are arranged in the ball valve body. A valve rod assembly adapted to the valve core assembly is inserted through the ball valve body. A driving device connected to the fixed bracket is arranged at the upper end of the valve rod assembly. The valve rod assembly includes an upper valve rod and a lower valve rod adapted to each other. A multi-sided rod fixedly connected to the lower end of the upper valve rod is provided. The multi-sided rod is a regular polygon and has no less than three sides. The central lines of the upper valve rod, the lower valve rod and the multi-sided rod are on the same straight line. A ball valve upper cavity and a ball valve lower cavity are respectively arranged on the upper and lower sides of the ball valve body. A replacement sliding groove adapted to the valve core assembly is opened on the inner wall of the ball valve upper cavity. A replacement limiting rod adapted to the valve core assembly is inserted through the replacement sliding groove. The valve core assembly includes an upper ball flap and a lower ball flap for replacement. The upper ball flap and the lower ball flap are connected to each other through a connecting sleeve and a pin. The lower end of the lower ball flap is sleeved on the lower valve rod. The upper ball flap and the lower ball flap move up and down through the valve rod assembly and the replacement sliding groove to complete online replacement.

[0007] By adopting the above technical solution, the valve core assembly includes an upper ball flap and a lower ball flap for replacement. When the upper ball flap is worn after long-term use, the valve core assembly makes the upper ball flap and the lower ball flap move upward through the cooperation of the valve rod assembly and the replacement sliding groove until the lower ball flap moves up to the original position of the upper ball flap, so as to complete the effect of online replacement of the ball flap, avoiding shutdown for maintenance, affecting production operations and unnecessary loss of materials.

[0008] The present invention is further arranged as follows: An upper connecting part integrated with the upper ball flap is arranged at the upper end of the upper ball flap. A regular polygon upper connecting through hole is opened on the upper connecting part. An upper conversion sleeve movably connected to the upper connecting through hole is inserted through the upper connecting through hole. The upper conversion sleeve is arranged in a T-shaped structure. An upper multi-sided hole adapted to the multi-sided rod is opened on the upper conversion sleeve. A connecting rod integrated with the upper conversion sleeve is arranged on one side of the upper end of the upper conversion sleeve. The end of the connecting rod is slidably connected to the replacement sliding groove. An upper spring is also sleeved on the upper conversion sleeve. The upper and lower ends of the upper spring are respectively abutted and connected to the head of the upper conversion sleeve and the upper connecting part.

[0009] By adopting the above technical solution, the upper connecting through hole is set as a regular polygon, ensuring that when the multi-sided rod drives the upper conversion sleeve to rotate, the upper ball flap can be driven to rotate, so as to achieve the effect of controlling the opening and closing of the ball valve by controlling the rotation of the upper ball flap. The connecting rod ensures that when the valve flap is replaced online, the multi-sided rod drives the connecting rod to rotate and then drives the upper ball flap to move upward. The upper spring makes the upper conversion sleeve move upward relative to the upper ball flap when the ball flap is replaced online, ensuring that the upper ball flap will not rotate when the multi-sided rod rotates.

[0010] The present invention is further configured such that: an upper limiting portion and an upper movable portion adapted to the upper connection through hole are provided on the up-conversion sleeve. The cross-section of the upper movable portion is circular and smaller than the diameter of the inscribed circle of the upper connection through hole. A limiting sleeve threadedly connected thereto is further sleeved on the lower end of the up-conversion sleeve. The limiting sleeve is in a T-shaped structure. The cross-section of the rod portion of the limiting sleeve is circular and smaller than the diameter of the inscribed circle of the upper connection through hole. The head of the limiting sleeve is larger than the diameter of the circumscribed circle of the upper connection hole.

[0011] By adopting the above technical solution, the upper limiting portion drives the upper ball valve flap to rotate through the multi-sided rod, realizing the control of the opening and closing of the ball valve by the upper ball valve flap. The upper movable portion and the limiting sleeve cooperate with each other so that the multi-sided rod will not drive the upper ball valve flap to rotate but only move it upward.

[0012] The present invention is further configured such that: a lower connection portion integrated with the lower ball valve flap is provided at the upper end of the lower ball valve flap. A regular polygon-shaped lower connection through hole is formed in the lower connection portion, and a lower conversion sleeve movably connected thereto is inserted into the lower connection through hole. A lower movable portion adapted to the upper ball valve flap is provided at the upper end of the lower conversion sleeve. The cross-section of the lower movable portion is circular. A lower limiting portion adapted to the lower connection through hole is provided on the lower side of the lower conversion sleeve. A lower limiting convex ring integrated with the lower limiting portion is further provided at the lower end of the lower conversion sleeve. A lower multi-sided hole and a guiding chamfer adapted to the multi-sided rod are further provided in the lower conversion sleeve. A positioning structure adapted to the multi-sided rod is further provided on one side of the lower conversion sleeve. A lower spring adapted to the positioning structure is further sleeved outside the lower conversion sleeve.

[0013] By adopting the above technical solution, the lower connection through hole is set as a regular polygon to ensure that when the multi-sided rod drives the lower rotating sleeve, it can drive the lower ball valve flap to rotate, thereby achieving the effect of controlling the opening and closing of the ball valve. The lower conversion sleeve completes the switching between the upward movement and the rotating state of the lower ball valve flap through the mutual cooperation of the multi-sided rod. The lower movable portion facilitates the rotation of the lower ball valve flap without driving the upper ball valve flap to rotate, reducing the power consumption required when the driving device drives the valve rod assembly to rotate. The guiding chamfer facilitates the insertion of the multi-sided rod into the lower multi-sided hole. The positioning structure positions the height of the lower conversion sleeve to ensure the reliability of the operation of replacing the ball valve flap online.

[0014] The present invention is further configured such that: a telescopic groove adapted to the positioning structure is formed in the connection sleeve. The positioning structure includes a side spring and a positioning block adapted to the lower conversion sleeve. A limiting groove adapted to the positioning block is formed in the lower conversion sleeve. Positioning card slots and positioning steps adapted to each other are respectively provided on the positioning block and the lower conversion sleeve. A positioning inclined surface adapted to the multi-sided rod is further provided at the end of the positioning block.

[0015] By adopting the above technical solution, when the multi-sided rod is inserted into the lower multi-sided hole, it squeezes the positioning inclined surface to move outward, so that the connecting multi-sided rod can drive the lower rotating sleeve to rotate and then drive the lower spherical valve flap to rotate. The positioning card slot and the positioning step cooperate with each other so that the lower conversion sleeve can move upward when the positioning block moves outward, so that the multi-sided rod can be inserted into the lower multi-sided hole, and then the variable rod can drive the lower spherical valve flap to rotate.

[0016] The present invention is further configured as: the replacement sliding groove includes a spiral groove, an upper horizontal groove and a vertical groove that are connected to the upper and lower ends of the spiral groove, and the lower end of the vertical groove is also connected to a lower horizontal groove parallel to the upper horizontal groove. The connections of the spiral groove, the upper horizontal groove, the vertical groove and the lower horizontal groove are all transitioned by arcs. A limit through hole adapted to the replacement limit rod is provided in the vertical groove, and the lowest point of the limit through hole and the highest point of the lower horizontal groove are in the same horizontal plane.

[0017] By adopting the above technical solution, when the connecting rod slides in the lower horizontal groove, the valve rod assembly drives the upper spherical valve flap to rotate to achieve the effect of controlling the opening and closing of the ball valve. When the connecting rod slides in the vertical groove, the upper conversion sleeve moves upward until the valve rod assembly cannot drive the upper spherical valve flap to rotate. When the connecting rod slides in the spiral groove, the valve rod assembly drives the connecting rod to rotate along the spiral groove and then drives the upper spherical valve flap and the lower spherical valve flap to move upward through the upper conversion sleeve. When the connecting rod slides on the upper horizontal groove, just the valve rod assembly drives the lower spherical valve flap to rotate to control the opening and closing of the ball valve. The lowest point of the limit through hole and the highest point of the lower horizontal groove being in the same horizontal plane can prevent the connecting rod from being clamped into the vertical groove under the action of the upper spring during the normal opening and closing of the upper spherical valve flap, affecting the opening and closing of the ball valve.

[0018] The present invention is further configured as: a limit boss integrated with the ball valve body is provided on the outside of the ball valve body, and a limit screw hole communicating with the limit through hole is provided on the limit boss. The limit screw hole is movably connected to the replacement limit rod by a threaded manner. The replacement limit rod includes a limit screw rod, a limit plug and a screwing head fixedly connected to both ends of the limit screw rod. A limit sealing ring that is snap-fitted with the inner wall of the limit through hole is sleeved on the limit plug.

[0019] By adopting the above technical solution, rotating the screwing head drives the limit screw rod to perform a telescopic action, and then drives the limit plug to limit the position of the connecting rod. When the limit plug extends out of the limit through hole, the connecting rod can only slide in the lower horizontal groove. When the limit plug retracts into the limit through hole, the connecting rod can slide into the vertical groove and then slide into the spiral groove and the upper horizontal groove to complete the online replacement of the spherical valve flap.

[0020] The present invention is further configured as: a packing gland sleeved on the upper valve rod is further provided at the upper end of the ball valve body. The packing gland sleeve is fixedly connected to the ball valve body by gland screws. A suitable sealing packing, a sealing cushion block and a sealing spring are also filled at the connection between the packing gland and the ball valve body.

[0021] By adopting the above technical solution, wear will occur at the connection between the sealing packing and the upper valve stem after long-term use. By screwing the gland screw to compress the sealing packing, the sealing performance at the connection between the upper valve stem and the ball valve body can be ensured.

[0022] The present invention is further configured as: the driving device is fixedly connected to the fixed bracket by means of screws, and the driving device is set as any one of a worm gear head, an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder.

[0023] By adopting the above technical solution, the driving device drives the valve stem assembly to rotate, thereby realizing the rotation of the upper ball flap or the lower ball flap to control the opening and closing of the ball valve. At the same time, the driving device drives the valve stem assembly to move the upper ball flap and the lower ball flap upward to complete the effect of online replacement of the ball flap.

[0024] The present invention is further configured as: an adjusting assembly adapted to the valve core assembly is further provided in the lower cavity of the ball valve. The adjusting assembly includes a lower cross bar and a lower adjusting rod that are perpendicular to each other and are connected by gear engagement. The lower cross bar and the lower adjusting rod form a worm and worm gear transmission part. The lower cross bar is horizontally arranged in the lower cavity of the ball valve, and its end is movably connected to the inner wall of the lower cavity of the ball valve through a cross bar bearing. An adjusting hand wheel fixedly connected thereto is further provided at one end of the lower cross bar. The lower adjusting rod is sleeved on the lower valve stem, and its upper end abuts against the lower end of the lower ball flap.

[0025] By adopting the above technical solution, the adjusting assembly prevents the height of the lower ball flap from being insufficient after moving upward, so that it cannot form an effective seal with the valve seat. By driving the lower cross bar to rotate through the adjusting hand wheel, the lower adjusting rod is driven to move upward, thereby pushing the lower ball flap upward to a suitable position.

[0026] In summary, the present invention has the following beneficial effects:

[0027] 1. Since the valve core assembly includes an upper ball flap and a replaceable lower ball flap, when the upper ball flap is worn after long-term use, the valve core assembly makes the upper ball flap and the lower ball flap move upward until the lower ball flap moves up to the original position of the upper ball flap through the cooperation of the valve stem assembly and the replacement sliding groove, thereby completing the effect of online replacement of the ball flap, avoiding shutdown for maintenance, affecting production operations and unnecessary losses of materials.

[0028] 2. The upper connection through-hole is set as a regular polygon, ensuring that when the multi-sided rod drives the upper conversion sleeve to rotate, it can drive the upper spherical valve flap to rotate, thereby achieving the effect of controlling the opening and closing of the ball valve by controlling the rotation of the upper spherical valve flap. The connecting rod ensures that when the valve flap is replaced online, the multi-sided rod drives the connecting rod to rotate and then drives the upper spherical valve flap to move upward. The upper spring makes the upper conversion sleeve move upward relative to the upper spherical valve flap when the ball valve flap is replaced online, ensuring that the upper spherical valve flap does not rotate when the multi-sided rod rotates; the lower connection through-hole is set as a regular polygon to ensure that when the multi-sided rod drives the lower rotating sleeve, it can drive the lower spherical valve flap to rotate, thereby achieving the effect of controlling the opening and closing of the ball valve. The lower conversion sleeve completes the switching of the upward movement and rotation states of the lower spherical valve flap through the mutual cooperation of the multi-sided rods. The lower movable part facilitates the lower spherical valve flap to rotate without driving the upper spherical valve flap to rotate, reducing the power consumption required when the driving device drives the valve stem assembly to rotate. The guiding chamfer is convenient for the multi-sided rod to penetrate into the lower multi-sided hole, and the positioning structure positions the height of the lower conversion sleeve to ensure the reliability of the action of replacing the ball valve flap online. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention.

[0030] Figure 2 is Figure 1 a partial enlarged schematic view of I in [the figure].

[0031] Figure 3 is Figure 1 a partial enlarged schematic view of II in [the figure].

[0032] Figure 4 It is a partial sectional schematic view of the replacement limit rod of Embodiment 1 of the present invention.

[0033] Figure 5 It is a schematic structural diagram of Embodiment 2 of the present invention.

[0034] Reference numerals: 1, ball valve body; 11, fixed bracket; 12, lower end cover; 13, inlet end; 14, outlet end; 15, valve seat; 16, upper cavity of ball valve; 161, spiral groove; 162, upper horizontal groove; 163, vertical groove; 164, lower horizontal groove; 17, lower cavity of ball valve; 18, limit boss; 181, limit screw hole; 19, packing gland; 191, gland screw; 192, sealing packing; 193, sealing cushion block; 194, sealing spring; 2, replaceable limit rod; 21, limit screw rod; 22, limit plug; 23, screwing head; 24, limit sealing ring; 3, valve core assembly; 31, upper ball flap; 311, upper connecting through hole; 32, lower ball flap; 33, upper conversion sleeve; 331, upper multi-sided hole; 332, connecting rod; 333, upper spring; 334, upper limit part; 335, upper movable part; 336, limit sleeve; 34, lower conversion sleeve; 341, lower movable part; 342, lower limit part; 343, lower limit convex ring; 344, lower multi-variable hole; 345, guiding chamfer; 346, lower spring; 347, limit groove; 348, positioning step; 35, positioning structure; 351, side spring; 352, positioning block; 353, positioning card slot; 354, positioning inclined surface; 4, valve rod assembly; 41, upper valve rod; 42, lower valve rod; 43, multi-sided rod; 5, driving device; 6, connecting sleeve; 61, retaining pin; 62, telescopic groove; 7, adjusting assembly; 71, lower cross bar; 711, cross bar bearing; 712, adjusting hand wheel; 72, lower adjusting rod. Detailed implementation mode

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1. This embodiment discloses an online replaceable double-ball-flap ball valve, as Figures 1 to 4As shown in the figure, it includes a ball valve body 1, a fixed bracket 11 and a lower end cover 12 fixedly connected to the upper and lower ends of the ball valve body 1 respectively. An inlet end 13 and an outlet end 14 are respectively arranged on the left and right sides of the ball valve body 1. A valve seat 15 and a valve core assembly 3 are arranged in the ball valve body 1 in a matching manner. A valve rod assembly 4 matching the valve core assembly 3 is inserted through the ball valve body 1. A driving device 5 connected to the fixed bracket 11 is arranged at the upper end of the valve rod assembly 4. The valve rod assembly 4 includes a matching upper valve rod 41 and a lower valve rod 42. A polygonal rod 43 fixedly connected to the lower end of the upper valve rod 41 is arranged at the lower end of the upper valve rod 41. The polygonal rod 43 is a regular polygon and has no less than three sides. The central lines of the upper valve rod 41, the lower valve rod 42 and the polygonal rod 43 are on the same straight line. A ball valve upper cavity 16 and a ball valve lower cavity 17 are respectively arranged on the upper and lower sides of the ball valve body 1. A replacement sliding groove matching the valve core assembly 3 is opened on the inner wall of the ball valve upper cavity 16. A replacement limiting rod 2 matching the valve core assembly 3 is inserted through the replacement sliding groove. The valve core assembly 3 includes an upper ball flap 31 and a lower ball flap 32 for replacement. The upper ball flap 31 and the lower ball flap 32 are connected to each other through a connecting sleeve 6 and a pin 61. The lower end of the lower ball flap 32 is sleeved on the lower valve rod 42. The upper ball flap 31 and the lower ball flap 32 move up and down through the valve rod assembly 4 and the replacement sliding groove to complete the online replacement; the valve core assembly 3 includes an upper ball flap 31 and a lower ball flap 32 for replacement. When the upper ball flap 31 is worn after long-term use, the valve core assembly 3 makes the upper ball flap 31 and the lower ball flap 32 move upward through the cooperation of the valve rod assembly 4 and the replacement sliding groove until the lower ball flap 32 moves up to the original position of the upper ball flap 31, so as to complete the effect of online replacement of the ball flap, avoid shutdown for maintenance, and affect production operations and unnecessary loss of materials.

[0037] The upper end of the upper ball valve flap 31 is provided with an upper connecting part integrated with it. A regular polygon-shaped upper connecting through hole 311 is formed in the upper connecting part. An upper conversion sleeve 33 movably connected to it is inserted in the upper connecting through hole 311. The upper conversion sleeve 33 is arranged in a T-shaped structure. An upper multi-sided hole 331 adapted to the multi-sided rod 43 is formed in the upper conversion sleeve 33. One side of the upper end of the upper conversion sleeve 33 is provided with a connecting rod 332 integrated with it. The end of the connecting rod 332 is slidably connected to the replacement sliding groove. An upper spring 333 is also sleeved on the upper conversion sleeve 33. The upper and lower ends of the upper spring 333 are respectively abutted and connected to the head of the upper conversion sleeve 33 and the upper connecting part. The upper connecting through hole 311 is set as a regular polygon, ensuring that when the multi-sided rod 43 drives the upper conversion sleeve 33 to rotate, it can drive the upper ball valve flap 31 to rotate, so as to achieve the effect of controlling the opening and closing of the ball valve by controlling the rotation of the upper ball valve flap 31. The connecting rod 332 ensures that when the valve flap is replaced online, the multi-sided rod 43 drives the connecting rod 332 to rotate and then drives the upper ball valve flap 31 to move upward. The upper spring 333 makes the upper conversion sleeve 33 move upward relative to the upper ball valve flap 31 when the ball valve flap is replaced online, ensuring that the upper ball valve flap 31 will not rotate when the multi-sided rod 43 rotates.

[0038] The upper conversion sleeve 33 is provided with an upper limiting part 334 and an upper movable part 335 adapted to the upper connecting through hole 311. The cross-section of the upper movable part 335 is arranged in a circular structure and is smaller than the diameter of the inscribed circle of the upper connecting through hole 311. A limiting sleeve 336 threadedly connected to it is also sleeved on the lower end of the upper conversion sleeve 33. The limiting sleeve 336 is arranged in a T-shaped structure. The cross-section of the rod part of the limiting sleeve 336 is arranged in a circular structure and is smaller than the diameter of the inscribed circle of the upper connecting through hole 311. The head of the limiting sleeve 336 is larger than the diameter of the circumscribed circle of the upper connecting hole. The upper limiting part 334 drives the upper ball valve flap 31 to rotate through the multi-sided rod 43, realizing the control of the opening and closing of the ball valve by the upper ball valve flap 31. The cooperation between the upper movable part 335 and the limiting sleeve 336 makes the multi-sided rod 43 not drive the upper ball valve flap 31 to rotate but only move it upward.

[0039] The upper end of the lower spherical valve flap 32 is provided with an integrally formed lower connecting part. A regular polygon-shaped lower connecting through hole is formed in the lower connecting part, and a lower conversion sleeve 34 movably connected thereto is inserted through the lower connecting through hole. The upper end of the lower conversion sleeve 34 is provided with a lower movable part 341 adapted to the upper spherical valve flap 31. The cross-section of the lower movable part 341 is circular. The lower side of the lower conversion sleeve 34 is provided with a lower limiting part 342 adapted to the lower connecting through hole. The lower end of the lower limiting part 342 is further provided with an integrally formed lower limiting convex ring 343. The lower conversion sleeve 34 is further provided with a lower multi-sided hole 344 and a guiding chamfer 345 adapted to the multi-sided rod 43. One side of the lower conversion sleeve 34 is further provided with a positioning structure 35 adapted to the multi-sided rod 43. A lower spring 346 adapted to the positioning structure 35 is sleeved outside the lower conversion sleeve 34. The lower connecting through hole is set as a regular polygon to ensure that when the multi-sided rod 43 drives the lower rotating sleeve, it can drive the lower spherical valve flap 32 to rotate, thereby achieving the effect of controlling the opening and closing of the ball valve. The lower conversion sleeve 34 completes the switching between the upward movement and the rotating state of the lower spherical valve flap 32 through the mutual cooperation of the multi-sided rod 43. The lower movable part 341 facilitates the rotation of the lower spherical valve flap 32 without driving the upper spherical valve flap 31 to rotate, reducing the power consumption required when the driving device 5 drives the valve rod assembly 4 to rotate. The guiding chamfer 345 facilitates the insertion of the multi-sided rod 43 into the lower multi-sided hole. The positioning structure 35 positions the height of the lower conversion sleeve 34 to ensure the reliability of the operation of replacing the spherical valve flap online.

[0040] The connecting sleeve 6 is provided with a telescopic groove 62 adapted to the positioning structure 35. The positioning structure 35 includes a side spring 351 and a positioning block 352 adapted to the lower conversion sleeve 34. The lower conversion sleeve 34 is provided with a limiting groove 347 adapted to the positioning block 352. The positioning block 352 and the lower conversion sleeve 34 are respectively provided with a mutually adapted positioning card slot 353 and a positioning step 348. The end of the positioning block 352 is further provided with a positioning inclined surface 354 adapted to the multi-sided rod 43. When the multi-sided rod 43 is inserted into the lower multi-sided hole, it squeezes the positioning inclined surface 354 to move outward, so that the connecting multi-sided rod 43 can drive the lower rotating sleeve to rotate and then drive the lower spherical valve flap 32 to rotate. The cooperation of the positioning card slot 353 and the positioning step 348 enables the lower conversion sleeve 34 to move upward when moving outward relative to the positioning block 352, so that the multi-sided rod 43 can be inserted into the lower multi-sided hole, and then the multi-sided rod can drive the lower spherical valve flap 32 to rotate.

[0041] The replacement sliding groove includes a spiral groove 161, an upper horizontal groove 162 and a vertical groove 163 that are connected to the upper and lower ends of the spiral groove 161. The lower end of the vertical groove 163 is also connected to a lower horizontal groove 164 that is parallel to the upper horizontal groove 162. The connections of the spiral groove 161, the upper horizontal groove 162, the vertical groove 163, and the lower horizontal groove 164 all adopt arc transitions. A limit through hole adapted to the replacement limit rod 2 is provided in the vertical groove 163, and the lowest point of the limit through hole and the highest point of the lower horizontal groove 164 are in the same horizontal plane. When the connecting rod 332 slides in the lower horizontal groove 164, the valve rod assembly 4 drives the upper ball valve flap 31 to rotate to achieve the effect of controlling the opening and closing of the ball valve. When the connecting rod 332 slides in the vertical groove 163, the upper conversion sleeve 33 moves upward until the valve rod assembly 4 cannot drive the upper ball valve flap 31 to rotate. When the connecting rod 332 slides in the spiral groove 161, the valve rod assembly 4 drives the connecting rod 332 to rotate along the spiral groove 161, and then drives the upper ball valve flap 31 and the lower ball valve flap 32 to move upward through the upper conversion sleeve 33. When the connecting rod 332 slides in the upper horizontal groove 162, just the valve rod assembly 4 drives the lower ball valve flap 32 to rotate to control the opening and closing of the ball valve. The lowest point of the limit through hole and the highest point of the lower horizontal groove 164 being in the same horizontal plane can prevent the connecting rod 332 from being clamped into the vertical groove 163 under the action of the upper spring 333 during the normal opening and closing of the upper ball valve flap 31, affecting the opening and closing of the ball valve. When the connecting rod 332 slides in the lower horizontal groove 164 or the upper horizontal groove 162, the opening or closing of the upper ball valve flap 31 or the lower ball valve flap 32 is restricted by 90 degrees.

[0042] A limit boss 18 integrated with the ball valve body 1 is provided on the outer side of the ball valve body 1. A limit screw hole 181 communicating with the limit through hole is provided on the limit boss 18. The limit screw hole 181 is movably connected to the replacement limit rod 2 in a threaded manner. The replacement limit rod 2 includes a limit screw 21, a limit plug 22 and a screwing head 23 fixedly connected to both ends of the limit screw 21. A limit sealing ring 24 that is snap-fitted to the inner wall of the limit through hole is sleeved on the limit plug 22. The screwing head 23 can be any one of an internal hexagon, a cross slot, and an external hexagon. Rotating the screwing head 23 drives the limit screw 21 to perform a telescopic action, and then drives the limit plug 22 to limit the position of the connecting rod 332. When the limit plug 22 extends out of the limit through hole, the connecting rod 332 can only slide in the lower horizontal groove 164. When the limit plug 22 retracts into the limit through hole, the connecting rod 332 can slide into the vertical groove 163 and then slide into the spiral groove 161 and the upper horizontal groove 162 to complete the on-line replacement of the ball valve flap.

[0043] The upper end of the ball valve body 1 is also provided with a packing gland 19 which is sleeved on the upper valve stem 41. The packing gland 19 is fixedly connected to the ball valve body 1 by a gland screw 191. The connection between the packing gland 19 and the ball valve body 1 is also filled with a matching sealing packing 192, a sealing gasket 193 and a sealing spring 194. The sealing packing 192 will wear out at the connection with the upper valve stem 41 after long-term use. The sealing packing 192 is tightened by screwing the gland screw 191, thereby ensuring the sealing of the connection between the upper valve stem 41 and the ball valve body 1.

[0044] The driving device 5 is fixedly connected to the fixed bracket 11 by means of screws, and the driving device 5 is configured as any one of a worm gear head, an electric cylinder, a pneumatic cylinder and a hydraulic cylinder; the driving device 5 drives the valve stem assembly 4 to rotate and thereby realizes the rotation of the upper ball flap 31 or the lower ball flap 32 to realize the opening and closing control of the ball valve, and at the same time drives the valve stem assembly 4 to realize the upper ball flap 31 and the lower ball flap 32 to move upward to complete the effect of online replacement of the ball flap. The actuator can be selected according to the actual working conditions to ensure the applicability of the product.

[0045] The working process is as follows:

[0046] 1) Before the ball flap is replaced, the drive device 5 drives the upper valve stem 41 to rotate, and then drives the polygonal rod 43 to rotate. The polygonal rod 43 drives the upper ball flap 31 to rotate through the upper polygonal hole 331 in the upper conversion sleeve 33, thereby realizing the opening and closing control of the ball valve;

[0047] 2) When replacing the ball flap of the ball valve online, rotate the replacement limit rod 2 to make it withdraw from the limit through hole, and the driving device 5 drives the upper valve stem 41, the polygonal rod 43, the upper conversion sleeve 33 and the upper ball flap 31 to rotate until the connecting rod 332 moves to the bottom of the vertical groove 163, and the upper conversion sleeve 33 moves upward under the action of the upper spring 333, so that the upper part of the upper conversion sleeve 33, i.e., the upper limit portion 334, is separated from the upper connecting through hole 311, and the connecting rod 332 passes through the vertical groove 163 and enters the lower end of the spiral groove 161. At this time, the polygonal rod 43 cannot drive the upper ball flap 31 to rotate; Continue to use the driving device 5 to drive the upper valve stem 41, the polygonal rod 43, and the upper conversion sleeve 33 to rotate. Since the connecting rod 332 enters the spiral groove 161, the upper conversion sleeve 33 rotates and moves upward, thereby driving the upper ball flap 31 and the lower ball flap 32 to move upward together; when the positioning inclined surface 354 on the positioning structure 35 contacts the lower end of the polygonal rod 43 and continues to move upward, the positioning block 352 moves into the telescopic groove 62 under the push of the polygonal rod 43, and finally causes the lower conversion sleeve 34 to move upward relative to the lower ball flap 32 under the action of the lower spring 346, and the polygonal rod 43 extends into the lower polygonal hole through the guide chamfer 345. The polygonal rod 43 cooperates with the lower polygonal hole to drive the lower ball flap 32 to rotate. At this time, the connecting rod 332 enters the upper transverse groove 162 along the spiral groove 161, and the driving device 5 drives the lower ball flap 32 to rotate;

[0048] 3) After replacing the ball valve flap, for the opening and closing of the ball valve, the driving device 5 drives the upper valve stem 41 to rotate, and then drives the multi-sided rod 43 to rotate. The multi-sided rod 43 drives the lower ball valve flap 32 to rotate through the lower multi-sided hole in the lower conversion sleeve 34, realizing the opening and closing control of the ball valve.

[0049] Embodiment 2. On the basis of Embodiment 1, as Figure 5 shown, an adjusting component 7 adapted to the valve core component 3 is further provided in the lower cavity 17 of the ball valve. The adjusting component 7 includes a lower cross bar 71 and a lower adjusting rod 72 that are perpendicular to each other and connected by gear engagement. The lower cross bar 71 and the lower adjusting rod 72 form a worm and worm gear transmission part. The lower cross bar 71 is horizontally arranged in the lower cavity 17 of the ball valve, and its end is movably connected to the inner wall of the lower cavity 17 of the ball valve through a cross bar bearing 711. An adjusting handwheel 712 fixedly connected thereto is further provided at one end of the lower cross bar 71. The lower adjusting rod 72 is sleeved on the lower valve stem 42, and its upper end abuts against the lower end of the lower ball valve flap 32. The adjusting component 7 prevents the height of the lower ball valve flap 32 from being insufficient after moving upward and being unable to form an effective seal with the valve seat 15. By driving the lower cross bar 71 to rotate through the adjusting handwheel 712, the lower adjusting rod 72 is driven to move upward, thereby pushing the lower ball valve flap 32 upward to a suitable position.

[0050] The working process is as follows: Rotating the adjusting handwheel 712 drives the lower cross bar 71 to rotate, and the lower cross bar 71 drives the lower adjusting rod 72 connected by gear engagement to move upward. The lower adjusting rod 72 moves upward along the lower valve stem 42 and pushes the lower ball valve flap 32 upward to adjust the height of the lower ball valve flap 32.

[0051] In summary, the present invention has the following beneficial effects:

[0052] 1. Since the valve core component includes an upper ball valve flap 31 and a replaceable lower ball valve flap 32, when the upper ball valve flap 31 is worn after long-term use, the valve core component 3 makes the upper ball valve flap 31 and the lower ball valve flap 32 move upward through the cooperation of the valve stem component 4 and the replacement sliding groove until the lower ball valve flap 32 moves up to the original position of the upper ball valve flap 31, thus achieving the effect of online replacement of the ball valve flap, avoiding shutdown for maintenance, affecting production operations and unnecessary loss of materials;

[0053] 2. The upper connecting through hole 311 is set as a regular polygon, ensuring that when the multi-sided rod 43 drives the upper conversion sleeve 33 to rotate, it can drive the upper spherical valve flap 31 to rotate, so as to achieve the effect of controlling the opening and closing of the ball valve by controlling the rotation of the upper spherical valve flap 31. The connecting rod 332 ensures that when the valve flap is replaced online, the multi-sided rod 43 drives the connecting rod 332 to rotate and then drives the upper spherical valve flap 31 to move upward. The upper spring 333 makes the upper conversion sleeve 33 move upward relative to the upper spherical valve flap 31 when the ball valve flap is replaced online, ensuring that the upper spherical valve flap 31 does not rotate when the multi-sided rod 43 rotates; setting the lower connecting through hole as a regular polygon ensures that when the multi-sided rod 43 drives the lower rotating sleeve, it can drive the lower spherical valve flap 32 to rotate, so as to achieve the effect of controlling the opening and closing of the ball valve. The lower conversion sleeve 34 completes the switching between the upward movement and the rotating state of the lower spherical valve flap 32 through the mutual cooperation of the multi-sided rod 43. The lower movable part 341 facilitates the rotation of the lower spherical valve flap 32 without driving the upper spherical valve flap 31 to rotate, reducing the power consumption required when the driving device 5 drives the valve rod assembly 4 to rotate. The guiding chamfer 345 facilitates the insertion of the multi-sided rod 43 into the lower multi-sided hole. The positioning structure 35 positions the height of the lower conversion sleeve 34 to ensure the reliability of the operation of replacing the ball valve flap online.

[0054] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention shall be included within the protection scope of the present invention.

Claims

1. An online replaceable double-disc ball valve, comprising a ball valve body (1), a fixed bracket (11) fixedly connected to the upper and lower ends of the ball valve body (1), and a lower end cover (12). The left and right sides of the ball valve body (1) are respectively provided with corresponding inlet ends (13) and outlet ends (14). A valve seat (15) and a valve core assembly (3) adapted to each other are arranged inside the ball valve body (1). A valve rod assembly (4) adapted to the valve core assembly (3) is inserted through the ball valve body (1). The upper end of the valve rod assembly (4) is provided with a driving device (5) connected to the fixed bracket (11), and is characterized in that: The valve stem assembly (4) includes a matching upper valve stem (41) and a lower valve stem (42). The lower end of the upper valve stem (41) is provided with a polygonal rod (43) fixedly connected thereto. The polygonal rod (43) is a regular polygon with no less than three sides. The central axes of the upper valve stem (41), the lower valve stem (42), and the polygonal rod (43) are on the same straight line. On the upper and lower sides of the ball valve body (1), a ball valve upper cavity (16) and a ball valve lower cavity (17) are respectively provided. A replacement sliding groove adapted to the valve core assembly (3) is formed on the inner wall of the ball valve upper cavity (16). A replacement limiting rod (2) adapted to the valve core assembly (3) is inserted into the replacement sliding groove. The valve core assembly (3) includes an upper ball flap (31) and a lower ball flap (32) for replacement. The upper ball flap (31) and the lower ball flap (32) are connected to each other through a connecting sleeve (6) and a retaining pin (61). The lower end of the lower ball flap (32) is sleeved on the lower valve stem (42). The upper ball flap (31) and the lower ball flap (32) move up and down through the valve stem assembly (4) and the replacement sliding groove to complete on-line replacement. An upper connecting part integrated with the upper ball flap (31) is provided at the upper end of the upper ball flap (31). A regular polygonal upper connecting through hole (311) is formed in the upper connecting part. An upper conversion sleeve (33) movably connected thereto is inserted into the upper connecting through hole (311). The upper conversion sleeve (33) is arranged in a T-shaped structure. An upper polygonal hole (331) adapted to the polygonal rod (43) is formed in the upper conversion sleeve (33). A connecting rod (332) integrated with the upper conversion sleeve (33) is provided on one side of the upper end of the upper conversion sleeve (33). The end of the connecting rod (332) is slidably connected to the replacement sliding groove. An upper spring (333) is also sleeved on the upper conversion sleeve (33). The upper and lower ends of the upper spring (333) are respectively abutted and connected to the head of the upper conversion sleeve (33) and the upper connecting part.

2. The online replaceable double-disc ball valve according to claim 1, wherein: An upper limiting part (334) and an upper movable part (335) adapted to the upper connecting through hole (311) are provided on the upper conversion sleeve (33). The cross-section of the upper movable part (335) is circular and smaller than the diameter of the inscribed circle of the upper connecting through hole (311). A limiting sleeve (336) threadedly connected thereto is also sleeved on the lower end of the upper conversion sleeve (33). The limiting sleeve (336) is arranged in a T-shaped structure. The cross-section of the rod part of the limiting sleeve (336) is circular and smaller than the diameter of the inscribed circle of the upper connecting through hole (311). The head of the limiting sleeve (336) is larger than the diameter of the circumscribed circle of the upper connecting hole.

3. The on-line replaceable double-disc ball valve according to claim 2, characterized in that: The upper end of the lower spherical valve flap (32) is provided with an integrally formed lower connecting part. A regular polygon-shaped lower connecting through hole is formed in the lower connecting part, and a lower conversion sleeve (34) movably connected thereto is inserted into the lower connecting through hole. The upper end of the lower conversion sleeve (34) is provided with a lower movable part (341) adapted to the upper spherical valve flap (31). The cross-section of the lower movable part (341) is circular. A lower limiting part (342) adapted to the lower connecting through hole is provided on the lower side of the lower conversion sleeve (34). A lower limiting convex ring (343) integrally formed therewith is further provided at the lower end of the lower limiting part (342). A lower variable hole (344) and a guiding chamfer (345) adapted to the multi-sided rod (43) are further provided in the lower conversion sleeve (34). A positioning structure (35) adapted to the multi-sided rod (43) is provided on one side of the lower conversion sleeve (34). A lower spring (346) adapted to the positioning structure (35) is sleeved outside the lower conversion sleeve (34).

4. The on-line replaceable double-disc ball valve according to claim 3, characterized in that: A telescopic groove (62) adapted to the positioning structure (35) is formed in the connecting sleeve (6). The positioning structure (35) includes a side spring (351) and a positioning block (352) adapted to the lower conversion sleeve (34). A limiting groove (347) adapted to the positioning block (352) is formed in the lower conversion sleeve (34). Adapted positioning card slots (353) and positioning steps (348) are respectively provided on the positioning block (352) and the lower conversion sleeve (34). A positioning inclined surface (354) adapted to the multi-sided rod (43) is further provided at the end of the positioning block (352).

5. An on-line replaceable double-disc ball valve according to claim 4, characterized in that: The replacement sliding groove includes a spiral groove (161), an upper horizontal groove (162) and a vertical groove (163) communicating with the upper and lower ends of the spiral groove (161). The lower end of the vertical groove (163) is further communicated with a lower horizontal groove (164) parallel to the upper horizontal groove (162). The joints of the spiral groove (161), the upper horizontal groove (162), the vertical groove (163) and the lower horizontal groove (164) are all transitioned by arcs. A limiting through hole adapted to the replacement limiting rod (2) is formed in the vertical groove (163), and the lowest point of the limiting through hole and the highest point of the lower horizontal groove (164) are in the same horizontal plane.

6. The on-line replaceable double-disc ball valve according to claim 5, characterized in that: A limiting boss (18) integrally formed therewith is provided outside the ball valve body (1). A limiting screw hole (181) communicating with the limiting through hole is formed in the limiting boss (18). The limiting screw hole (181) is movably connected to the replacement limiting rod (2) by means of threads. The replacement limiting rod (2) includes a limiting screw (21), a limiting plug (22) and a screwing head (23) fixedly connected to both ends of the limiting screw (21). A limiting sealing ring (24) engaged with the inner wall of the limiting through hole is sleeved on the limiting plug (22).

7. An on-line replaceable double-disc ball valve according to claim 6, characterized in that: A packing gland (19) sleeving on the upper valve stem (41) is further arranged at the upper end of the ball valve body (1). The packing gland (19) is fixedly connected with the ball valve body (1) through gland screws (191). A suitable sealing packing (192), a sealing spacer block (193) and a sealing spring (194) are also filled at the joint of the packing gland (19) and the ball valve body (1).

8. An on-line replaceable double-disc ball valve according to claim 7, characterized in that: The driving device (5) is fixedly connected with the fixed bracket (11) in a screw manner. The driving device (5) is set as any one of a worm gear head, an electric cylinder, a pneumatic cylinder and a hydraulic cylinder.

9. An on-line replaceable double-disc ball valve according to any one of claims 1 to 8, characterized in that: An adjusting assembly (7) adapted to the valve core assembly (3) is further arranged in the lower cavity (17) of the ball valve. The adjusting assembly (7) comprises a lower cross bar (71) and a lower adjusting rod (72) which are perpendicular to each other and connected by gear engagement. The lower cross bar (71) and the lower adjusting rod (72) form a worm and worm gear transmission part. The lower cross bar (71) is horizontally arranged in the lower cavity (17) of the ball valve and its end is movably connected with the inner wall of the lower cavity (17) of the ball valve through a cross bar bearing (711). An adjusting hand wheel (712) fixedly connected therewith is further arranged at one end of the lower cross bar (71). The lower adjusting rod (72) sleeving on the lower valve stem (42) has its upper end abutted against the lower end of the lower ball flap (32).

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