Top-mounted ball valve

Abstract

The invention discloses a top-mounted ball valve, which relates to the technical field of valves, and comprises a valve body, a ball body, two valve seat assemblies and two driving assemblies, the valve body is provided with a valve cavity, and an upper opening, an upstream channel and a downstream channel are formed in the valve body; shelving grooves are formed in the two sides of the valve cavity; a valve seat assembly is arranged in each placing groove; each valve seat assembly corresponds to one driving assembly; the ball body is located in a valve cavity between the two valve seat assemblies. A conducting channel is formed in the ball body; the valve seat assembly can rotate around the axis of the valve seat assembly in the containing groove and can be close to or away from the ball body along the axis of the valve seat assembly in the containing groove. The driving assembly comprises a worm shaft and a worm gear; the worm shaft and the worm gear are respectively arranged in the valve body in a manner of rotating around own axes; one end of the worm shaft is positioned outside the valve body; the worm gear is sleeved on the valve seat assembly, internal threads are arranged on the inner side of the worm gear, external threads are arranged on the outer side of the valve seat assembly, and the internal threads are in threaded connection with the external threads. And the maintenance is simpler and more convenient.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a top-mounted ball valve. Background Art

[0002] Top-entry ball valves are widely used in oil and gas pipelines, as well as in oil production, refining, petrochemical, chemical, chemical fiber, metallurgy, electricity, nuclear power, food and papermaking. Top-entry ball valves are easy and quick to disassemble on the pipeline, and are easy and quick to repair. When a valve fails on the pipeline and needs to be repaired, it is not necessary to remove the entire valve from the pipeline. Just remove the nut of the valve cover, remove the combination of the valve cover and valve stem from the valve body, and then remove the ball and valve seat from the valve body. The ball and valve seat can be replaced or repaired online. The ball is wrapped by the valve seats on both sides. To install or remove the ball, the valve seats on both sides must be pushed to the left and right directions of the center plane of the ball, so that the distance between the two valve seats is greater than the length of the left and right sides when the ball is in the open position.

[0003] Usually, the distance between the two valve seats is adjusted by manually rotating the adjusting nut. Due to the small internal space of the valve, manually rotating the adjusting nut is time-consuming and laborious, and cannot meet the requirements of quick disassembly and assembly. Summary of the invention

[0004] The object of the present invention is to provide a top-mounted ball valve to solve the problems existing in the above-mentioned prior art and make repair and maintenance simpler and more convenient.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a top-mounted ball valve, comprising a valve body, a ball, two valve seat assemblies and two drive assemblies; the valve body has a valve cavity, and the valve body is provided with an upper opening, an upstream channel and a downstream channel connected to the valve cavity; the valve cavity is provided with a shelf groove on one side corresponding to the upstream channel and on one side of the downstream channel; each shelf groove is provided with a valve seat assembly; each valve seat assembly corresponds to a drive assembly; the ball is located in the valve cavity between the two valve seat assemblies; a conducting channel is provided on the ball, and the ball is rotated until the two ends of the conducting channel are respectively connected to the upstream channel , when the downstream channel is connected, the upstream channel is connected with the downstream channel; the valve seat assembly can rotate around its own axis in the shelf groove, and the valve seat assembly can approach or move away from the sphere along its own axis in the shelf groove; the driving assembly includes a worm shaft and a worm wheel cooperating with the worm shaft; the worm shaft and the worm wheel are respectively arranged in the valve body and rotate around their own axes, and one end of the worm shaft is located outside the valve body; the worm wheel is sleeved on the valve seat assembly, the inner side of the worm wheel is provided with an internal thread, and the outer side of the valve seat assembly is provided with an external thread, and the internal thread is threadedly connected with the external thread.

[0007] Preferably, the valve seat assembly includes a valve seat, a movable ring and a disc spring; the outer side of the movable ring is provided with the external thread; the movable ring is sleeved on the outer side of the valve seat, and the movable ring is coaxially arranged with the valve seat; a sealing surface is provided on the side of the valve seat close to the sphere; a first limiting surface is provided on the outer side of an end of the valve seat close to the sphere; a second limiting surface is provided on an end of the movable ring close to the limiting surface; the disc spring is sleeved on the outer side of the valve seat, and the disc spring is located between the first limiting surface and the second limiting surface.

[0008] Preferably, the worm shaft comprises a driving shaft, a worm tube and a flat key; the worm tube is sleeved on the driving shaft, and the flat key is provided between the worm tube and the driving shaft, and the flat key can enable the worm tube and the driving shaft to rotate synchronously.

[0009] Preferably, a locking nut is respectively provided at both ends of the worm gear tube, and a locking thread is provided at a position on the drive shaft corresponding to each locking nut; each locking nut is threadedly connected to the corresponding locking thread.

[0010] Preferably, the valve body is provided with a rotating hole and a through hole corresponding to the rotating hole; one end of the drive shaft is rotatably set in the rotating hole, and the other end of the drive shaft is passed through the through hole and extends out of the outside of the valve body, and the end of the drive shaft located on the outside of the valve body is set as a square head.

[0011] Preferably, a limiting groove is provided at the lower end of the sphere, a supporting shaft is passed through the limiting groove, and the supporting shaft is fixedly connected to the valve body; a valve stem is fixedly connected to the upper end of the sphere; a valve cover is fixedly provided on the valve body corresponding to the upper opening, and a through hole is provided on the valve cover; the valve stem seal is passed through the through hole, and one end of the valve stem away from the sphere extends out of the through hole; the valve stem can rotate around its own axis in the through hole.

[0012] Preferably, a sealing sleeve is provided on the driving shaft at a position corresponding to the through hole.

[0013] Preferably, a stuffing groove is provided at one end of the valve cover away from the valve body, and the stuffing groove is coaxially arranged with the through hole; the stuffing groove located in the circumference of the valve stem is filled with stuffing; and the upper opening of the stuffing groove is closed with a cover.

[0014] Preferably, a limiting portion is provided at one end of the movable ring close to the limiting surface, and the limiting portion can abut against the outer side of the lower end of the valve stem.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The top-mounted ball valve provided by the present invention only needs to rotate the worm shaft outside the valve body when adjusting the distance between the two valve seat assemblies. When the relative distance between the two valve seat assemblies is greater than the length of the left and right sides when the ball is in the open position, the ball, valve seat assembly and other parts can be lifted out of the valve body and sent to a maintenance workshop for maintenance. After the ball, valve seat assembly and other parts are repaired and installed in the valve body, it is only necessary to rotate the end of the worm shaft located on the outside of the valve body in the opposite direction to return the valve seat assembly to its designed original position, thereby making its maintenance and repair simpler and more convenient; and through the cooperation of the worm shaft and the worm wheel, it is possible to achieve high-precision control of the clearance between the valve seat assemblies on both sides of the ball. ; and it can allow clearance adjustment without stopping the machine or affecting the normal operation of the system, and its adjustment structure is simple and flexible; by accurately adjusting the gap between the valve seat assemblies on both sides of the ball, it can ensure that the sealing surfaces between the ball and the valve seat assembly are tightly fitted, effectively preventing medium leakage, and meeting the use requirements of high-sealing occasions; reasonable clearance adjustment can reduce friction and wear between the ball and the valve seat assembly, and extend service life; good sealing performance can also prevent the medium from corroding the valve seat assembly and the ball, and further protect their integrity; the worm gear has a self-locking function, which can keep the valve seat assembly fixed in the specified position without moving on its own.

[0017] Furthermore, a disc spring is arranged between the valve seat and the movable ring, one end of the disc spring is supported on the second limit surface corresponding to the movable ring, and the other end of the disc spring is supported on the first limit surface corresponding to the valve seat. The disc spring provides elastic force after being compressed, pushing the sealing surface of the valve seat to close to the spherical surface of the sphere to form a seal, thereby preventing the fluid in the flow channel from leaking into the cavity formed by the outer surface of the sphere and the inner surface of the valve body; the addition of the disc spring provides a continuous pre-tightening force for the valve seat, ensuring that a good sealing effect is maintained between the valve seat and the sphere under long-term operation or medium pressure fluctuations; the movable ring can push the valve seat to make fine adjustments to meet the sealing requirements under different working conditions; the elastic effect of the disc spring not only provides a pre-tightening force for the valve seat, but also plays a role in buffering and shock absorption during the flow of the medium, which helps to reduce the vibration and noise of the valve and improve the overall operation stability of the system; the replacement and maintenance of the valve seat assembly are relatively simple. When the valve seat needs to be inspected or replaced, the relevant components can be easily disassembled and installed, reducing the difficulty and cost of maintenance.

[0018] Furthermore, the drive shaft drives the worm tube with a flat key to achieve synchronous rotation. The flat key, as a component connecting the drive shaft and the worm tube, can ensure the precise connection and synchronous rotation between the two. This design reduces the sliding and clearance during the transmission process, improves the accuracy and stability of the transmission; and when the teeth on the worm shaft that match the worm wheel are damaged, only the worm tube can be replaced, reducing the cost of component maintenance.

[0019] Furthermore, the locking nut can ensure that the worm tube will not loosen or fall off due to vibration or external force during operation, or move in the axial direction of the drive shaft, thereby improving the overall stability and safety of the ball valve; ensuring that the connection between the worm shaft and the drive shaft is always maintained in the best condition; by removing the locking nut, the worm tube and its related components can be easily removed, which is convenient for inspection, cleaning or replacement of damaged parts; the locking nut can limit the relative position of the worm tube on the drive shaft, so that it can cooperate with the worm wheel more reasonably and effectively, ensuring its stable cooperation with the worm wheel.

[0020] Furthermore, the square head design enables the outer end of the drive shaft to be easily adapted to various manual or electric tools, such as wrenches, etc. This design facilitates the operator to use appropriate tools to rotate the drive shaft, thereby achieving precise adjustment of the valve seat position.

[0021] Furthermore, the support shaft arranged at the lower end of the sphere provides stable support for the sphere, so that the sphere can maintain a stable position when subjected to medium pressure or operating force, reducing the risk of sealing failure caused by swaying of the sphere; precise control of the sphere can be achieved by rotating the valve stem. This design allows the operator to easily open, close or adjust the flow rate of the valve.

[0022] Furthermore, the sealing sleeve can effectively prevent the ingress of harmful objects such as external dust, moisture, foreign matter, etc. and the outflow of internal media.

[0023] Furthermore, by tightly wrapping the valve stem and forming an effective sealing interface with its surface, the packing can significantly reduce the risk of medium leakage and ensure the sealing performance of the ball valve.

[0024] Furthermore, when the limit portion on the movable ring contacts the outer side of the lower end of the valve stem, the movable ring can no longer move toward the center of the sphere, that is, the axial movement distance of the movable ring is controlled, the valve seat reaches the set position, and the valve seat sealing surface fits against the outer surface of the sphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the overall structure of the top-entry ball valve provided by the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of cross section at DD in the middle;

[0028] Figure 3 for Figure 1 A partial enlarged view of the middle A;

[0029] Figure 4 A schematic diagram of the structure of the worm shaft in the top-entry ball valve provided by the present invention;

[0030] Figure 5 This is a schematic diagram of the external structure of the top-entry ball valve provided by the present invention.

[0031] In the figure:

[0032] 100-Top entry ball valve;

[0033] 10-valve body; 11-valve cavity; 12-upper opening; 13-upstream channel; 14-downstream channel; 15-rotation hole; 16-perforation; 17-sealing sleeve;

[0034] 20-ball; 21-support shaft; 22-valve stem; 23-valve cover; 24-packing; 25-cover;

[0035] 30-valve seat assembly; 31-valve seat; 311-sealing surface; 312-first limiting surface; 32-moving ring; 321-second limiting surface; 322-limiting part; 33-disc spring;

[0036] 40-driving assembly; 41-driving shaft; 411-square head; 42-worm tube; 43-flat key; 44-locking nut; 45-worm wheel;

[0037] 50-Wrench. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The purpose of the present invention is to provide a top-mounted ball valve to solve the problems existing in the prior art and make repair and maintenance simpler and more convenient.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Embodiment 1

[0042] This embodiment provides a top-mounted ball valve 100, which is a type of worm gear 45 driving a valve seat 31, and is made of steel, such as Figure 1 to Figure 5As shown, the valve body 10, the ball 20, two valve seat assemblies 30 and two drive assemblies 40 are included; the valve body 10 has a valve cavity 11, and the valve body 10 is provided with an upper opening 12, an upstream channel 13 and a downstream channel 14 which are communicated with the valve cavity 11; the valve cavity 11 is provided with a shelf groove on one side corresponding to the upstream channel 13 and one side corresponding to the downstream channel 14; a valve seat assembly 30 is respectively arranged in each shelf groove; each valve seat assembly 30 corresponds to a drive assembly 40; the ball 20 is located in the valve cavity 11 between the two valve seat assemblies 30; a conducting channel is provided on the ball 20, and the ball 20 is rotated to the ends of the conducting channel respectively. When connected with the upstream channel 13 and the downstream channel 14, the upstream channel 13 and the downstream channel 14 are connected; the valve seat assembly 30 can rotate around its own axis in the shelf groove, and the valve seat assembly 30 can approach or move away from the ball 20 along its own axis in the shelf groove; the driving assembly 40 includes a worm shaft and a worm wheel 45 matched with the worm shaft; the worm shaft and the worm wheel 45 are respectively arranged in the valve body 10 to rotate around their own axes, and one end of the worm shaft is located outside the valve body 10; the worm wheel 45 is sleeved on the valve seat assembly 30, and an internal thread is arranged on the inner side of the worm wheel 45, and an external thread is arranged on the outer side of the valve seat assembly 30, and the internal thread is threadedly connected with the external thread.

[0043] When adjusting the distance between the two valve seat assemblies 30, it is only necessary to rotate the worm shaft outside the valve body 10. When the relative distance between the two valve seat assemblies 30 is greater than the length of the left and right sides of the ball 20 when it is in the open position, the ball 20, the valve seat assembly 30 and other parts can be lifted out of the valve body 10 and sent to a maintenance workshop for repair. After the ball 20, the valve seat assembly 30 and other parts are repaired and installed in the valve body 10, it is only necessary to reversely rotate the end of the worm shaft located on the outside of the valve body 10 to return the valve seat assembly 30 to its designed original position, thereby making its repair and maintenance simpler and more convenient; and through the cooperation of the worm shaft and the worm wheel 45, it is possible to achieve high-precision control of the gap between the valve seat assemblies 30 on both sides of the ball 20; and It can allow clearance adjustment without stopping the machine or affecting the normal operation of the system, and its adjustment structure is simple and flexible. By accurately adjusting the clearance between the valve seat assemblies 30 on both sides of the ball 20, it can ensure that the sealing surface 311 between the ball 20 and the valve seat assembly 30 fits tightly, effectively preventing medium leakage, and meeting the use requirements of high sealing occasions. Reasonable clearance adjustment can reduce the friction and wear between the ball 20 and the valve seat assembly 30, and extend the service life. Good sealing performance can also prevent the medium from corroding the valve seat assembly 30 and the ball 20, and further protect their integrity. The worm gear 45 has a self-locking function, which can keep the valve seat assembly 30 fixed in the specified position without moving on its own.

[0044] Specifically, a ball 20, a valve seat 31, a moving ring 32, a turbine, a worm, etc. are arranged in the inner cavity of the valve body 10; a valve cover 23, a valve stem 22, a shaft sleeve, a packing 24, a gland, etc. are arranged on the upper part of the valve body 10, and these parts are combined into a whole. It is designed as an integral structure, which has few leakage points and is firm and reliable.

[0045] Specifically, when it is necessary to inspect or replace the ball 20, valve seat 31 and other parts, it is not necessary to remove the valve from the pipeline. Only the nut of the valve cover 23 needs to be removed, the valve cover 23 assembly is removed, the ball 20 is lifted out, and the valve seat 31 and other parts of the inner cavity of the valve body 10 can be removed. This greatly facilitates the maintenance of underground pipelines, especially ball valves for the atomic energy industry.

[0046] Among them, the relevant structural description of the valve seat assembly 30 is as follows:

[0047] Among the optional solutions of this embodiment, it is more preferred that Figure 1 to Figure 3 As shown, the valve seat assembly 30 includes a valve seat 31, a movable ring 32 and a disc spring 33; an external thread is provided on the outer side of the movable ring 32; the movable ring 32 is sleeved on the outer side of the valve seat 31, and the movable ring 32 and the valve seat 31 are coaxially arranged; a sealing surface 311 is provided on the side of the valve seat 31 close to the sphere 20; a first limiting surface 312 is provided on the outer side of one end of the valve seat 31 close to the sphere 20; a second limiting surface 321 is provided on the end of the movable ring 32 close to the limiting surface; the disc spring 33 is sleeved on the outer side of the valve seat 31, and the disc spring 33 is located between the first limiting surface 312 and the second limiting surface 321. A disc spring 33 is arranged between the valve seat 31 and the movable ring 32. One end of the disc spring 33 is supported on the second limiting surface 321 corresponding to the movable ring 32, and the other end of the disc spring 33 is supported on the first limiting surface 312 corresponding to the valve seat 31. The disc spring 33 provides elastic force after being compressed, pushing the sealing surface 311 of the valve seat 31 to closely adhere to the spherical surface of the ball 20 to form a seal, thereby preventing the fluid in the flow channel from leaking into the cavity formed by the outer surface of the ball 20 and the inner surface of the valve body 10. The addition of the disc spring 33 provides a continuous pre-tightening force for the valve seat 31, ensuring that the valve seat 31 is in a state of being ... Under such circumstances, a good sealing effect can still be maintained between the valve seat 31 and the ball 20; the movable ring 32 can push the valve seat 31 for fine-tuning to adapt to the sealing requirements under different working conditions; the elastic effect of the disc spring 33 not only provides a pre-tightening force for the valve seat 31, but also plays a role in buffering and shock absorption during the flow of the medium, which helps to reduce the vibration and noise of the valve and improve the overall operation stability of the system; the replacement and maintenance of the valve seat assembly 30 is relatively simple. When the valve seat 31 needs to be inspected or replaced, the relevant components can be easily disassembled and installed, reducing the difficulty and cost of maintenance.

[0048] The relevant structure description of the driving assembly 40 is as follows:

[0049] Among the optional solutions of this embodiment, it is more preferred that Figure 1 , Figure 2 and Figure 4 As shown, the worm shaft includes a driving shaft 41, a worm tube 42 and a flat key 43; the worm tube 42 is sleeved on the driving shaft 41, and a flat key 43 is provided between the worm tube 42 and the driving shaft 41, and the flat key 43 can keep the worm tube 42 and the driving shaft 41 in synchronous rotation. The driving shaft 41 drives the worm tube 42 with the flat key 43 to achieve synchronous rotation. The flat key 43, as a component connecting the driving shaft 41 and the worm tube 42, can ensure the precise connection and synchronous rotation between the two. This design reduces the sliding and clearance during the transmission process, improves the accuracy and stability of the transmission; and after the teeth on the worm shaft that cooperate with the worm wheel 45 are damaged, only the worm tube 42 can be replaced, thereby reducing the cost of component maintenance.

[0050] Among the optional solutions of this embodiment, it is more preferred that Figure 4 As shown, a locking nut 44 is provided at each end of the worm tube 42, and a locking thread is provided at the position corresponding to each locking nut 44 on the drive shaft 41; each locking nut 44 is threadedly connected with the corresponding locking thread. Through the locking nut 44, it can be ensured that the worm tube 42 will not loosen or fall off due to vibration or external force during operation, or move in the axial direction of the drive shaft 41, thereby improving the overall stability and safety of the ball valve; ensuring that the connection between the worm shaft and the drive shaft 41 is always maintained in the best state; by removing the locking nut 44, the worm tube 42 and its related components can be easily removed, which is convenient for inspection, cleaning or replacement of damaged parts of each component; the locking nut 44 can limit the relative position of the worm tube 42 on the drive shaft 41, so that it can cooperate with the worm wheel 45 more reasonably and effectively, and ensure its stable cooperation with the worm wheel 45.

[0051] Among the optional solutions of this embodiment, it is more preferred that Figure 2 As shown, the valve body 10 is provided with a rotation hole 15 and a through hole 16 corresponding to the rotation hole 15; one end of the drive shaft 41 is rotatably arranged in the rotation hole 15, and the other end of the drive shaft 41 is penetrated through the through hole 16 and extends out of the outside of the valve body 10, and the end of the drive shaft 41 located outside the valve body 10 is provided with a square head 411. The square head 411 design enables the outer end of the drive shaft 41 to be easily adapted to various manual or electric tools, such as a wrench 50, etc. This design facilitates the operator to use a suitable tool to rotate the drive shaft 41, thereby realizing precise adjustment of the position of the valve seat 31.

[0052] Among the optional solutions of this embodiment, it is more preferred that Figure 2As shown, a sealing sleeve 17 is sleeved on the driving shaft 41 at a position corresponding to the through hole 16. The sealing sleeve 17 can effectively prevent the entry of harmful objects such as external dust, moisture, foreign matter, etc. and the outflow of internal medium.

[0053] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 3 As shown, a limiting portion 322 is provided at one end of the movable ring 32 close to the limiting surface, and the limiting portion 322 can abut against the outer side of the lower end of the valve stem 22. When the limiting portion 322 on the movable ring 32 contacts the outer side of the lower end of the valve stem 22, the movable ring 32 can no longer move toward the center direction of the sphere 20, that is, the axial movement distance of the movable ring 32 is controlled, the valve seat 31 reaches the set position, and the sealing surface 311 of the valve seat 31 fits against the outer surface of the sphere 20.

[0054] Among them, regarding other related instructions:

[0055] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, a limit groove is provided at the lower end of the ball 20, and a support shaft 21 is inserted into the limit groove, and the support shaft 21 is fixedly connected to the valve body 10; a valve stem 22 is fixedly connected to the upper end of the ball 20; a valve cover 23 is fixedly provided at the valve body 10 corresponding to the upper opening 12, and a through hole 16 is provided on the valve cover 23; the valve stem 22 is sealed and inserted into the through hole 16, and the end of the valve stem 22 away from the ball 20 extends out of the through hole 16; the valve stem 22 can rotate around its own axis in the through hole 16. The support shaft 21 provided at the lower end of the ball 20 provides a stable support for the ball 20, so that the ball 20 can maintain a stable position when subjected to medium pressure or operating force, reducing the risk of sealing failure caused by the shaking of the ball 20; the ball 20 can be precisely controlled by rotating the valve stem 22, and this design allows the operator to easily open, close or adjust the flow rate of the valve.

[0056] Specifically, a shaft sleeve is provided at the lower end of the valve stem 22 .

[0057] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, a packing 24 groove is provided at one end of the valve cover 23 away from the valve body 10, and the packing 24 groove is coaxially arranged with the through hole 16; the packing 24 groove located in the circumference of the valve stem 22 is filled with the packing 24; and the upper opening of the packing 24 groove is closed with a cover 25. The packing 24 can significantly reduce the risk of medium leakage and ensure the sealing performance of the ball valve by tightly wrapping the valve stem 22 and forming an effective sealing interface with its surface.

[0058] Specifically, the ball 20 is located in the center of the valve body 10 and is installed from top to bottom. The bottom of the ball 20 is supported by the support shaft 21, and the cylindrical structure at the upper end of the support shaft 21 is installed in the cylindrical hole (i.e., the limit groove) corresponding to the ball 20; the left and right sides of the ball 20 cooperate with the valve seat 31, and the sealing surface 311 of the valve seat 31 fits with the outer surface of the ball 20; the valve seat 31 and the movable ring 32 are coaxially sleeved; a disc spring 33 (such as Figure 3 As shown in the figure, the left end of the disc spring 33 is supported on the plane corresponding to the moving ring 32 (i.e., the second limiting surface 321), and the right end of the disc spring 33 is supported on the plane corresponding to the valve seat 31 ring (i.e., the first limiting surface 312). After being compressed, the disc spring 33 provides elastic force to push the sealing surface 311 of the valve seat 31 to form a seal tightly against the spherical surface, thereby preventing the fluid in the flow channel from leaking into the cavity formed by the outer surface of the sphere 20 and the inner surface of the valve body 10; the moving ring 32 and the turbine are matched, and the inner hole of the turbine is provided with a thread (i.e., an internal thread), and the outer cylindrical surface of the moving ring 32 that fits therewith is provided with a thread of the same specification (i.e., an external thread); the turbine is stuck in the slot of the valve body 10, and the turbine can rotate in the slot, but cannot move axially (i.e., the worm gear 45 is arranged in the valve body 10 around its own axis), so when the turbine rotates, the thread force drives the moving ring 32 to move axially.

[0059] Specifically, the relevant description of the drive assembly 40 is as follows: the worm tube 42 is fitted with the drive shaft 41, the drive shaft 41 drives the worm tube 42 with a flat key 43, the local length of the worm tube 42 and the drive shaft 41 is provided with a thread (i.e., a locking thread), and locking nuts 44 are provided at both ends of the worm. When the worm and the turbine are aligned, the locking nuts 44 at both ends are locked; one end of the drive shaft 41 is inserted into the cylindrical hole (i.e., the rotating hole 15) corresponding to the valve body 10, and the other end extends out of the valve body 10, and a sealing sleeve 17 is provided in the cylindrical space (i.e., the through hole 16) between the valve body 10 and the drive shaft 41, and the sealing sleeve 17 supports the drive shaft 41, and sealing rings are provided on the inner and outer cylindrical surfaces of the sealing sleeve 17 to prevent the fluid from leaking out of the valve body 10. The extended end of the drive shaft 41 is provided with a square head 411, and the square head 411 is matched with the square hole of the wrench 50.

[0060] Specifically, the assembly process of the top-entry ball valve 100 with the worm gear driven valve seat 31 is as follows:

[0061] 1. Install the support shaft 21 into the circular hole at the bottom of the valve body 10;

[0062] 2. Place the worm gear 45 (2 pieces, one symmetrical on each side) into the valve body 10. The valve body 10 has a groove (i.e., the installation position of the worm gear 45). The turbine is inserted into the groove. The turbine can rotate in the groove, but cannot move axially.

[0063] 3. Install the disc spring 33, the moving ring 32 and the valve seat 31 sealing ring on the valve seat 31 in sequence (an annular groove is provided on the outer side of the valve seat 31, and the valve seat 31 sealing ring is provided inside the annular groove);

[0064] 4. The valve seat 31, disc spring 33, movable ring 32 and valve seat 31 sealing ring are assembled and the external thread of movable ring 32 is screwed into the internal thread hole of the turbine. At this time, the valve seat 31 assembly is pulled apart to both sides of the valve body 10, so that there is enough axial distance between the two valve seats 31 for the ball 20 to be installed from top to bottom.

[0065] 5. Hang the ball 20 from top to bottom and place it into the valve body 10. The round hole at the bottom of the ball 20 is fitted onto the support shaft 21.

[0066] 6. Insert the drive shaft 41 from the outside of the valve body 10 into the valve body 10, and sequentially insert the lock nut 44, flat key 43, worm tube 42, and lock nut 44 into the drive shaft 41 that enters the valve body 10. Align the flat key 43 on the drive shaft 41 with the keyway of the worm tube 42 and insert it. When the worm tube 42 is aligned with the installed turbine tooth shape, tighten the lock nuts 44 at both ends of the worm.

[0067] 7. Install a sealing ring on the outer cylindrical surface and the inner hole of the sealing sleeve 17, and fit the sealing sleeve 17 with the sealing ring installed on the drive shaft 41 and the valve body 10, and fasten it with a screw;

[0068] 8. Put a wrench 50 on the square head 411 of the extended end of the drive shaft 41, rotate the wrench 50, and the drive shaft 41 drives the worm tube 42, the worm tube 42 drives the worm wheel 45, and the worm wheel 45 is threadedly connected with the moving ring 32;

[0069] 9. Install the shaft sleeve, valve stem 22 (install from bottom to top), packing 24, and gland into the valve cover 23 in sequence, fasten the gland with a screw, embed the valve body 10 and valve cover 23 gasket on the upper part of the valve body 10, and then hoist the valve cover 23 to combine with the valve body 10, and align the valve stem 22 with the corresponding matching hole of the ball 20;

[0070] 10. Lock the threaded parts of the valve body 10 and the valve cover 23. At this point, the overall assembly of the top-entry ball valve 100 is completed.

[0071] Specifically, the two drive assemblies 40 (specifically, the drive shafts 41 in the two drive assemblies 40) can also be linked through transmission teeth, and the synchronous movement of the two drive shafts 41 can be achieved by rotating the drive shaft 41 of one of the drive assemblies 40. At this time, the two drive shafts 41 move synchronously in opposite directions, such as the drive shafts 41 on both sides respectively drive the corresponding valve seats 31 to move toward the direction closer to the sphere 20 or away from the sphere 20.

[0072] Specifically, the principle is explained as follows: by using the worm gear structure to drive the moving ring 32, the two symmetrically arranged moving rings 32 and the valve seat 31 can be quickly moved axially. When the axial length between the two symmetrically arranged moving rings 32 and the valve seat 31 is greater than the required axial distance when the ball 20 is installed from the bottom, the ball 20 can be lifted in or lifted out of the valve body 10. After the ball 20 is lifted out of the valve body 10, the valve seat 31, the disc spring 33, and the moving ring 32 can be taken out of the valve body 10 for maintenance or replacement.

[0073] When the valve seat 31, disc spring 33 and movable ring 32 are repaired or replaced, the ball 20 is hoisted and the drive shaft 41 is rotated. When the upper edge of the movable ring 32 contacts the outer cylindrical surface of the cylinder extending from the lower part of the valve stem 22, the movable ring 32 can no longer move toward the center of the ball 20, that is, the axial movement distance of the movable ring 32 is controlled, and the valve seat 31 reaches the set position, and the sealing surface 311 of the valve seat 31 fits with the outer surface of the ball 20.

[0074] The worm gear 45 has a self-locking function, which can keep the valve seat 31 fixed at the design specified position without moving automatically. The wrench 50 is only used when the worm gear 45 needs to be rotated. After the valve seat 31 is placed in the set position, the wrench 50 should be removed to avoid misoperation of the rotating wrench 50.

[0075] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A top-entry ball valve, characterized in that: It includes a valve body, a ball, two valve seat assemblies and two drive assemblies; The valve body has a valve cavity, and an upper opening, an upstream channel and a downstream channel communicating with the valve cavity are provided on the valve body; a side of the valve cavity corresponding to the upstream channel and a side of the downstream channel are both provided with a shelf groove; a valve seat assembly is respectively provided in each of the shelf grooves; and each of the valve seat assemblies corresponds to a drive assembly; The ball is located in the valve cavity between the two valve seat assemblies; a conducting channel is provided on the ball, and when the ball is rotated until both ends of the conducting channel are connected to the upstream channel and the downstream channel respectively, the upstream channel and the downstream channel are connected; The valve seat assembly can rotate around its own axis in the shelf groove, and the valve seat assembly can move closer to or farther from the ball along its own axis in the shelf groove; The driving assembly includes a worm shaft and a worm wheel matched with the worm shaft; the worm shaft and the worm wheel are respectively arranged in the valve body and rotate around their own axes, and one end of the worm shaft is located outside the valve body; the worm wheel is sleeved on the valve seat assembly, the inner side of the worm wheel is provided with an internal thread, and the outer side of the valve seat assembly is provided with an external thread, and the internal thread is threadedly connected with the external thread.

2. The top entry ball valve according to claim 1, characterized in that: The valve seat assembly comprises a valve seat, a moving ring and a disc spring; the outer side of the moving ring is provided with the external thread; The movable ring is sleeved on the outer side of the valve seat, and the movable ring and the valve seat are coaxially arranged; A sealing surface is provided on one side of the valve seat close to the sphere; The valve seat has a first limiting surface on the outer side of one end close to the sphere; the movable ring has a second limiting surface on one end close to the limiting surface; The disc spring is sleeved on the outer side of the valve seat, and the disc spring is located between the first limiting surface and the second limiting surface.

3. The top entry ball valve according to claim 1, characterized in that: The worm shaft comprises a driving shaft, a worm tube and a flat key; The worm tube is sleeved on the driving shaft, and the flat key is arranged between the worm tube and the driving shaft, and the flat key can enable the worm tube and the driving shaft to keep synchronous rotation.

4. The top entry ball valve according to claim 3, characterized in that: A locking nut is respectively arranged at both ends of the worm tube, and locking threads are arranged at positions corresponding to the locking nuts on the drive shaft; and each locking nut is threadedly connected with the corresponding locking thread.

5. The top entry ball valve according to claim 3, characterized in that: The valve body is provided with a rotation hole and a through hole corresponding to the rotation hole; One end of the drive shaft is rotatably disposed in the rotating hole, and the other end of the drive shaft is penetrated through the through hole and extends out of the valve body, and one end of the drive shaft located outside the valve body is configured as a square head.

6. The top entry ball valve according to claim 2, characterized in that: A limiting groove is provided at the lower end of the sphere, a support shaft is passed through the limiting groove, and the support shaft is fixedly connected to the valve body; The upper end of the sphere is fixedly connected with a valve stem; A valve cover is fixedly arranged at the valve body corresponding to the upper opening, and a through hole is arranged on the valve cover; The valve stem is sealably disposed in the through hole, and one end of the valve stem away from the sphere extends out of the through hole; the valve stem can rotate around its own axis in the through hole.

7. The top entry ball valve according to claim 5, characterized in that: A sealing sleeve is sleeved on the driving shaft at a position corresponding to the through hole.

8. The top entry ball valve according to claim 6, characterized in that: A packing groove is provided at one end of the valve cover away from the valve body, and the packing groove is coaxially arranged with the through hole; The packing groove located in the circumference of the valve stem is filled with packing; The upper opening of the filling slot is sealed with a cover.

9. The top entry ball valve according to claim 6, characterized in that: A limiting portion is provided at one end of the movable ring close to the limiting surface, and the limiting portion can abut against the outer side of the lower end of the valve stem.

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