Hard sealing integrated forged steel ball valve

Abstract

The application discloses a hard sealing integrated forged steel ball valve in the technical field of ball valves, which comprises a valve cavity, a valve seat, a flange seat, a ball, a valve rod and a sliding cavity; a hollow sleeve which is clamped in the sliding cavity and can freely slide, the end of the hollow sleeve towards the valve cavity is provided with a sealing cavity, and the sealing cavity is matched with the shape of the ball; and a driving mechanism for synchronously driving the hollow sleeve to slide in the sliding cavity when the ball rotates. When the ball is rotated to the state that the communication hole is disconnected with the flange seat, the hollow sleeve is driven by the driving mechanism to move towards the ball until the spherical surface of the ball is clamped with the sealing cavity, thereby sealing the inside of the valve seat; when the valve seat is fully opened, the hollow sleeve is driven by the driving mechanism to move away from the ball, so that the spherical surface of the ball is separated from the clamping state of the sealing cavity; in the process, the surface of the ball and the inner wall of the sealing cavity are not rubbed and worn, so that the wear of the surface of the ball is reduced, and the service life of the ball is improved.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, specifically a hard-seal integrated forged steel ball valve. Background Technology

[0002] A ball valve is a valve in which the opening and closing element (ball) is driven by the valve stem and rotates around the valve's axis. It can also be used for fluid regulation and control. Hard-seal V-type ball valves, with their V-shaped ball core and hard alloy-faced metal seat, possess strong shearing force, making them particularly suitable for media containing fibers or small solid particles. Multi-port ball valves in pipelines can flexibly control the merging, splitting, and switching of flow directions of media, and can also close any channel while connecting the other two. These valves should generally be installed horizontally in pipelines. Ball valves are classified according to their actuation method: pneumatic ball valves, electric ball valves, and manual ball valves.

[0003] A search revealed Chinese Patent Publication No. CN204900997U, which discloses a ball valve comprising a valve seat, a ball, and a valve stem. The ball is located within the valve seat, and its top is connected to the valve stem. A radial boss is provided on the outer edge of the valve seat end, with the side of the boss and the end face of the valve seat on the same plane. The boss increases the sealing area at the valve seat end, improving the sealing effect and preventing leakage. The boss also makes the valve seat end structure more stable, improving the product qualification rate.

[0004] Existing ball valves only have two operating modes: fully open and fully closed. In the aforementioned ball valves, the valve stem drives the ball to rotate during the fully open and fully closed process, causing the connecting hole on the ball to connect with or close the pipeline. During the rotation, the outer wall of the ball and the surface of the boss generate significant friction. As is known, when the ball valve is in the fully open state, the sealing degree between the ball and the boss surface does not affect the working state of the ball valve. Therefore, when switching from the fully closed state to the fully open state, the ball and the boss surface will generate two frictions, resulting in unnecessary friction and wear, which in turn causes severe wear of the ball and affects the service life of the ball valve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a hard-seal integrated forged steel ball valve. In order to solve the above-mentioned technical problem, the present invention provides the following technical solution:

[0006] This invention provides: a hard-seal integrated forged steel ball valve, comprising a valve seat with an internal valve cavity, flange seats being connected through both ends of the valve seat, a ball being movably connected within the valve cavity, a valve stem being fixedly connected to the ball, the valve stem passing through the valve seat and being able to rotate freely, and further comprising:

[0007] A sliding cavity is coaxially formed within the flange seat, and the sliding cavity communicates with the valve cavity;

[0008] A hollow sleeve that is fitted into the sliding cavity and can slide freely has a sealing cavity at one end facing the valve cavity, and the sealing cavity matches the shape of the sphere;

[0009] A drive mechanism for synchronously driving the hollow sleeve to slide within the sliding cavity as the sphere rotates.

[0010] Preferably, the valve seat is provided with an installation port, and an end cap for closing the installation port is detachably connected to the valve seat.

[0011] Preferably, the drive mechanism includes:

[0012] A rotating rod is vertically slidably inserted through the flange seat, the rotating rod penetrates the hollow sleeve and can rotate freely;

[0013] A cam is fixedly mounted on the rotating rod. The hollow sleeve has an installation groove on its outer wall for mounting the cam. The installation groove has a rectangular cross-section, and the farthest end of the outer edge of the cam contacts the inner wall of one side of the installation groove, so that when the cam rotates, it can drive the hollow sleeve to reciprocate along the flange seat axial direction.

[0014] A rotating unit used to synchronously drive the rotating rod to rotate when the valve stem rotates.

[0015] Preferably, the rotating unit comprises:

[0016] A mounting base fixed to the valve seat, the valve stem passing through the mounting base and being able to rotate freely, and a sliding groove being provided in the mounting base, the length direction of the sliding groove being parallel to the axial direction of the flange seat;

[0017] A rack column is engaged in the sliding groove and can slide freely horizontally; the valve stem has a gear part, and the rack column meshes with the gear part.

[0018] A rotating arm is fixedly fitted onto one end of the rotating rod that extends out of the flange seat;

[0019] A hinge rod with its two ends hinged to the rotating arm and the rack column, respectively.

[0020] Preferably, the valve seat has a communicating cavity extending into the mounting base, the interior of the communicating cavity is connected to the interior of the valve cavity, a floating plug that can slide freely up and down is engaged in the communicating cavity, the floating plug is slidably fitted on the valve stem and is keyed to the valve stem, the floating plug is provided with a floating rotation unit, the floating rotation unit is used to drive the valve stem to rotate when the floating plug moves up and down.

[0021] Preferably, the floating rotation unit includes:

[0022] A fixed post is attached to the upper end face of the floating plug;

[0023] A fixing sleeve horizontally fixed to the fixing column;

[0024] A mounting pin is horizontally connected to the fixed sleeve. A ball is rotatably fitted at one end of the mounting pin facing the radially outer side of the floating plug. A spiral rolling groove is provided on the inner wall of the communicating cavity for the ball to engage. The ball can roll freely in the spiral rolling groove.

[0025] Preferably, the fixing sleeve has a blind hole-shaped sliding hole, the mounting pin is telescopically inserted into the sliding hole, and a first spring is installed in the sliding hole, the first spring elastically abutting against the mounting pin.

[0026] Preferably, a stop pin is provided on the mounting pin, and a waist-shaped hole is provided on the fixing sleeve for the stop pin to be inserted, wherein the length direction of the waist-shaped hole is parallel to the sliding direction of the mounting pin.

[0027] Preferably, a second spring is installed inside the sliding cavity, and the second spring elastically abuts against the hollow sleeve.

[0028] Preferably, the surface of the sphere is provided with a chromium plating layer.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This invention features a hollow sleeve with a sealing cavity. When the ball rotates and engages with the sealing cavity, the contact surface between the inner wall of the sealing cavity and the outer wall of the ball can seal, providing a mechanical seal for the valve seat. Furthermore, when the ball rotates to the point where the connecting hole and flange seat are disconnected, a drive mechanism moves the hollow sleeve towards the ball until the spherical surface of the ball engages with the sealing cavity, thus sealing the inside of the valve seat. When the valve seat is fully open, the drive mechanism moves the hollow sleeve away from the ball, disengaging the spherical surface of the ball from the sealing cavity. During this process, no frictional wear occurs between the ball surface and the inner wall of the sealing cavity, thus reducing wear on the ball surface and extending the ball's service life.

[0031] This invention, by setting the valve stem to rotate, causes the gear section to drive the rack column to move, which in turn drives the hinge rod to swing. During the swinging process, the hinge rod drives the swing arm to rotate, which in turn drives the rotating rod to rotate, thereby driving the cam to rotate. The cam then drives the hollow sleeve to move, thus enabling the hollow sleeve to slide within the sliding cavity. Since the rotation of the valve stem is used to control the flow of fluid in the valve seat, the opening and closing state of the valve seat is adjusted synchronously, causing the hollow sleeve to move accordingly. This allows the movement of the hollow sleeve to match the opening and closing state of the valve seat.

[0032] The present invention generates an elastic resisting force on the end face of the hollow sleeve by setting a second spring, so that the hollow sleeve tends to move towards the inside of the valve seat, thereby ensuring that the inner wall of the mounting groove on the hollow sleeve remains in contact with the outer edge of the cam during the rotation of the cam.

[0033] This invention, by setting a floating plug and a floating rotation unit, allows fluid to flow into the communicating cavity from the gap between the inner wall of the sealing cavity and the ball surface when the valve stem fails to rotate to the correct position, causing a gap between the ball surface and the inner wall of the hollow sleeve sealing cavity and reducing the sealing effect of the two surfaces. As the liquid level rises, the floating plug is driven to move upward. When the floating plug moves upward, the floating rotation unit drives the valve stem to rotate, which in turn drives the ball to rotate, ensuring that the valve stem rotates to the correct position.

[0034] This invention features a floating rotating unit consisting of a fixed sleeve, a mounting pin, balls, and a spiral rolling groove. When fluid enters the communicating cavity, the floating plug, under the action of buoyancy, will drive the fixed sleeve to move upward, while simultaneously causing the balls to roll within the spiral rolling groove. Since the spiral rolling groove is spiral-shaped, the balls roll within it. Furthermore, because the floating plug is keyed to the valve stem, it can drive the valve stem to rotate, thereby ensuring that the valve stem rotates to its designated position. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a schematic diagram of the structure of a hard-seal integrated forged steel ball valve according to the present invention;

[0037] Figure 2 for Figure 1 A schematic diagram of the structure viewed from below;

[0038] Figure 3 for Figure 1 A structural diagram omitting valve seats and flange seats;

[0039] Figure 4 for Figure 3 A top-view diagram of the mid-structure;

[0040] Figure 5 for Figure 1 Cross-sectional view of the middle structure;

[0041] Figure 6 This is a schematic diagram of the assembled structure of the valve seat, flange seat, and mounting base in this invention;

[0042] Figure 7 for Figure 6 A partial sectional view of the central structure;

[0043] Figure 8 This is a schematic diagram of the structure of the floating plug, fixed sleeve and mounting pin after assembly in this invention;

[0044] Figure 9 for Figure 8 Schematic diagram of the explosive decomposition of the medium structure;

[0045] Figure 10 This is a schematic diagram of the hollow sleeve in this invention;

[0046] Figure 11 for Figure 10 Cross-sectional view of the structure.

[0047] The labels in the figures are explained as follows:

[0048] 1-Valve seat; 2-End cover; 3-Flange seat; 4-Second spring; 5-Rotating rod; 6-Rotating arm; 7-Hinge rod; 8-Rack column; 9-Mounting seat; 10-Valve stem; 11-Sliding groove; 12-Cam; 13-Floating plug; 14-Gear part; 15-Ball; 16-Hollow sleeve; 17-Connecting hole; 18-Sliding cavity; 19-Valve cavity; 20-Helical rolling groove; 21-Fixing sleeve; 22-Mounting pin; 23-Fixing column; 24-Oval hole; 25-Stop pin; 26-Ball; 27-First spring; 28-Sealing cavity; 29-Mounting groove. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example

[0051] like Figure 1-11As shown, this embodiment provides a technical solution: a hard-seal integrated forged steel ball valve, including a valve seat 1 with an internal valve cavity 19, an installation port on the valve seat 1, and an end cap 2 for closing the installation port installed on the valve seat 1 by screw connection. This allows the valve cavity 19 inside the valve seat 1 to be opened when the end cap 2 is removed. Flange seats 3 are connected through both ends of the valve seat 1. A ball 15 is movably connected inside the valve cavity 19, and a valve stem 10 is fixedly connected to the ball 15. The valve stem 10 extends out of the valve seat 1 and can rotate freely. The rotation of the valve stem 10 drives the ball 15 to rotate, allowing the connecting hole 17 on the ball 15 to communicate with or close the interior of the flange seat 3, thereby controlling the fluid flow state inside the valve seat 1. Furthermore, the valve seat 1 and flange seat 3 are integrally formed structures and forged from steel, thus improving the mechanical strength of the valve seat 1 and flange seat 3. The ball valve also includes:

[0052] A sliding cavity 18 is coaxially formed inside the flange seat 3. The inner diameter of the sliding cavity 18 is larger than the diameter of the inner hole of the flange seat 3. The sliding cavity 18 is connected to the valve cavity 19.

[0053] A hollow sleeve 16, which is engaged within the sliding cavity 18 and can slide freely, has an annular structure. A sealing cavity 28 is provided at one end of the hollow sleeve 16 facing the valve cavity 19. The sealing cavity 28 matches the shape of the ball 15, so that when the inner wall of the sealing cavity 28 engages with the spherical surface of the ball 15, the contact surface between the sealing cavity 28 and the ball 15 can be sealed.

[0054] A drive mechanism for synchronously driving the hollow sleeve 16 to slide within the sliding cavity 18 when the ball 15 rotates.

[0055] Specifically, when valve seat 1 needs to be opened to connect the two flange seats 3 with the interior of valve seat 1, the valve stem 10 is first rotated. The valve stem 10 drives the ball 15 to rotate, thereby causing the connecting hole 17 on the ball 15 to rotate to connect the two flange seats 3. At this time, valve seat 1 is in the fully open state. In the fully open state, the drive mechanism drives the hollow sleeve 16 away from valve seat 1, causing the inner wall of the sealing cavity 28 to disengage from the contact state with the spherical surface of the ball 15. This allows the spherical surface of the ball 15 to remain in the fully open state of valve seat 1. In the process, the ball 15 will not be subjected to significant mechanical wear, thus extending its service life. When the valve seat 1 is in a fully closed state, the ball 15 will rotate. During the rotation, the drive mechanism will drive the hollow sleeve 16 to move towards the inside of the valve seat 1 until the connecting hole 17 on the ball 15 connects with the two flange seats 3. At the same time, the inner wall of the sealing cavity 28 on the hollow sleeve 16 will contact the spherical surface of the ball 15 until it is completely pressed together, thereby creating a sealing state between the inner wall of the sealing cavity 28 and the spherical surface of the ball 15.

[0056] like Figure 3 , 4As shown in Figure 5, the drive mechanism includes:

[0057] A rotating rod 5 is vertically slidably installed on the flange seat 3. The flange seat 3 has a first through hole for the rotating rod 5 to be inserted. Furthermore, a dynamic sealing ring can be installed in the first through hole. The rotating rod 5 is inserted into the dynamic sealing ring, so that the rotating rod 5 and the flange seat 3 are sealed to prevent fluid from flowing out from the inner wall of the rotating rod 5 and the first through hole. The rotating rod 5 penetrates the hollow sleeve 16 and can rotate freely.

[0058] The cam 12 is fixedly mounted on the rotating rod 5. Furthermore, the cam 12 can be installed on the rotating rod 5 by a tight fit. In addition, the hollow sleeve 16 has an installation groove 29 on its outer wall for mounting the cam 12. The installation groove 29 has a rectangular cross-section, and the farthest point of the outer edge of the cam 12 contacts the inner wall of one side of the installation groove 29. This allows the cam 12 to drive the hollow sleeve 16 to reciprocate along the flange seat 3 axis when it rotates. The cam 12 and the installation groove form a cam structure, so that when the cam 12 rotates, the farthest point of the outer edge of the cam 12 will continuously contact the inner wall of the installation groove 29, thereby enabling the cam 12 to drive the hollow sleeve 16 to move.

[0059] A rotating unit is used to synchronously drive the rotating rod 5 to rotate when the valve stem 10 rotates. This rotating unit causes the valve stem 10 to rotate when it operates, which in turn causes the rotating rod 5 to rotate the cam 12. When the cam 12 rotates, the farthest edge of the cam 12 contacts the inner wall of the mounting groove 29 (one of the two inner walls corresponding to the flange seat 3 axially), thereby driving the hollow sleeve 16 to move. Specifically, when the valve stem 10 rotates, causing the connecting hole 17 on the ball 15 to connect with the inside of the flange seat 3, the cam 12 contacts the inner wall of the mounting groove 29 on the side away from the valve seat 1, thus driving the hollow sleeve 16 to move away from the valve seat 1. This movement causes the inner wall of the sealing cavity 28 to disengage from the spherical surface of the ball 15, resulting in less wear on the spherical surface of the ball 15 when the valve seat 1 is fully open, thereby increasing the service life of the ball 15.

[0060] like Figure 3 , 4 As shown in Figure 5, the rotating unit includes:

[0061] Mounting seat 9 is fixed to valve seat 1. Mounting seat 9 can be connected to valve seat 1 by welding or integrally formed with valve seat 1. In addition, valve stem 10 passes through mounting seat 9 and can rotate freely. Of course, a second through hole can also be opened on mounting seat 9. A dynamic sealing ring is installed in the second through hole, and valve stem 10 is inserted into the dynamic sealing ring, so that there is a good sealing effect between valve stem 19 and the hole wall of the second through hole. In addition, a sliding groove 11 is opened in mounting seat 9. The length direction of sliding groove 11 is parallel to the axial direction of flange seat 3.

[0062] The rack column 8 is engaged in the sliding groove 11 and can slide freely horizontally. The longitudinal cross-sectional dimensions of the rack column 8 match the longitudinal cross-sectional dimensions of the sliding groove 11, so that the rack column 8 and the sliding groove 11 form a sliding fit. In addition, the valve stem 10 is provided with a gear part 14, and the rack column 8 meshes with the gear part 14. When the valve stem 10 rotates, the gear part 14 will rotate, and the rack column 8 will mesh with the gear part 14, thereby driving the rack column 8 to slide in the sliding groove 11.

[0063] A rotating arm 6 is fixedly fitted onto one end of the rotating rod 5 that protrudes from the flange seat 3. Of course, the rotating arm 6 can be installed on the rotating rod 5 by welding.

[0064] The hinge rod 7 is hinged to the rotating arm 6 and the rack column 8 at both ends respectively. By setting the hinge rod 7, when the rack column 8 moves horizontally, the hinge rod 7 can pull the rotating arm 6 to rotate, so that the movement of the rack column 8 is converted into driving the rotation of the rotating rod 5.

[0065] Specifically, when operating the valve stem 10, the rotation of the valve stem 10 will drive the gear part 14 to rotate. When the gear part 14 rotates, it will drive the gear part 14 to mesh with the rack column 8. During the meshing transmission, the rack column 8 will drive the hinge rod 7 to swing. The swing of the hinge rod 7 will drive the rotating arm 6 to rotate. When the rotating arm 6 rotates, it will synchronously drive the rotating rod to rotate, thereby driving the cam 12 to rotate.

[0066] like Figure 7 , 8 As shown in Figure 9, the valve seat 1 has a communicating cavity extending into the mounting base 9, which communicates with the valve cavity 19. A floating plug 13, capable of sliding freely up and down, is engaged within the communicating cavity. The floating plug 13 is slidably fitted onto the valve stem 10 and is keyed to the valve stem 10. The floating plug 13 is equipped with a floating rotation unit, which drives the valve stem 10 to rotate as the floating plug 13 moves up and down. Specifically, the floating rotation unit includes:

[0067] A fixing post 23 is fixed to the upper end face of the floating plug 13. The fixing post 23 can be fixedly connected to the upper end face of the floating plug 13 by welding.

[0068] A fixing sleeve 21 is horizontally fixed to the fixing column 23, and the axial direction of the fixing sleeve 21 is perpendicular to the axial direction of the fixing column 23.

[0069] A mounting pin 22 is horizontally connected to the fixed sleeve 21. A ball 26 is rotatably fitted at one end of the mounting pin 22 facing the radially outer side of the floating plug 13. Specifically, a spherical groove is opened at the end of the mounting pin 22. The ball 26 is fitted into the spherical groove and can rotate freely, so that the ball 26 is rolled and fitted into the mounting pin 22. In addition, a spiral rolling groove 20 is provided on the inner wall of the communicating cavity for the ball 26 to engage. The inner diameter of the spiral rolling groove 20 matches the ball diameter of the ball 26, so that the ball 26 can roll freely in the spiral rolling groove 20. In addition, when the floating plug 13 moves upward, the ball 26 will roll in the spiral rolling groove 20 and will move upward along the spiral direction of the spiral rolling groove 20. During the movement, the ball 26 will drive the floating plug 13 to rotate.

[0070] Specifically, when the operator rotates the valve stem 10 but it is not fully in place, there is a certain gap between the inner wall of the sealing cavity 28 and the spherical surface of the ball 15. After the fluid flows into the connecting cavity through this gap, the liquid level in the connecting cavity will gradually rise as the fluid continues to flow in. After the liquid level rises, it will generate buoyancy on the floating plug 13, thereby driving the floating plug 13 to move upward. During the upward movement, the ball 26 will roll in the spiral rolling groove 20, and as the floating plug 13 moves upward, it can drive the floating plug 13 to rotate. Since the floating plug 13 and the valve stem 10 are keyed, the rotation of the floating plug 13 will drive the valve stem 10 to rotate, so that the valve stem 10 can rotate to the full position. This can minimize the gap between the inner wall of the sealing cavity 28 and the surface of the ball 15. In this way, when the valve seat 1 is fully closed and the valve stem 10 is not fully rotated, it can actively drive the valve stem 10 to rotate, thereby maximizing the sealing effect of the valve seat 1.

[0071] like Figure 8 , 9 As shown, the fixed sleeve 21 has a blind hole-shaped sliding hole. The mounting pin 22 is inserted into the sliding hole. A first spring 27 is installed in the sliding hole. The first spring 27 elastically abuts against the mounting pin 22. By setting the first spring 27, the first spring 27 generates an elastic preload on the mounting pin 22. This allows the ball 26 to avoid the obstructed position and roll smoothly when it is obstructed in the spiral rolling groove 20.

[0072] like Figure 8 , 9As shown, a stop pin 25 is provided on the mounting pin 22, and a waist-shaped hole 24 is provided on the fixing sleeve 21 for the stop pin 25 to be inserted. The length direction of the waist-shaped hole 24 is parallel to the sliding direction of the mounting pin 22. By sliding the stop pin 25 in the waist-shaped hole 24, the mounting pin 22 can be limited. In addition, since the stop pin 25 can only slide along the length direction of the waist-shaped hole 24 in the waist-shaped hole 24, the circumferential rotation of the mounting pin 22 can be limited. At the same time, it can prevent the mounting pin 22 from sliding out of the sliding hole of the fixing sleeve 21, thereby causing the mounting pin 22 to disengage from the sliding hole.

[0073] As shown in Figures 3 and 4, a second spring 4 is installed in the sliding cavity 18. The second spring 4 elastically abuts against the hollow sleeve 16. The axis of the second spring 4 is parallel to the sliding direction of the hollow sleeve 16 in the sliding cavity 18. In the initial state, the second spring 4 elastically abuts against the end face of the hollow sleeve 16, thereby generating a pre-pressure on the hollow sleeve 16. This keeps the inner wall of the mounting groove 29 on the hollow sleeve 16 in contact with the outer edge of the cam 12, so that the rotation of the cam 12 can better drive the hollow sleeve 16 to move.

[0074] like Figure 3 , 4 As shown, the surface of the sphere 15 is provided with a chrome plating layer (not shown in the figure). By setting the chrome plating layer, the surface of the sphere 15 has a better sealing effect and the wear is also reduced.

[0075] The working principle of this invention: When the valve seat 1 is fully open, the valve stem 10 needs to be rotated so that the connecting hole 17 on the ball 15 is connected to the two flange seats 3. At this time, the valve stem 10 is operated first, and the valve stem 10 rotates. The rotation of the valve stem 10 will drive the gear part 14 to rotate. When the gear part 14 rotates, it will drive the gear part 14 to mesh with the rack column 8. During the meshing transmission, the rack column 8 will drive the hinge rod 7 to swing. The swing of the hinge rod 7 will drive the rotating arm 6 to rotate. When the rotating arm 6 rotates, it will synchronously drive the rotating rod 5 to rotate, thereby driving the cam 12 to rotate. This will cause the farthest end of the outer edge of the cam 12 to continuously contact the inner wall of the mounting groove 29, thereby enabling the cam 12 to drive the hollow sleeve 16 to move away from the valve seat 1. This will cause the inner wall of the sealing cavity 28 on the hollow sleeve 16 to separate from the contact state with the outer wall of the ball 15, thus making the ball... During rotation, the mechanical wear of the inner wall of the sealing cavity 28 on the spherical surface of the ball 15 is reduced. Conversely, when the valve seat 1 is fully closed, the valve stem 10 needs to be rotated to disengage the connecting hole 17 on the ball 15 from the flange seat 3. At this time, rotating the valve stem 10 causes the spherical surface of the ball 15 to rotate to correspond with the flange seat 3, thereby causing the gear part 14 to mesh with the rack column 8 and drive the hinge rod 7 to swing, thereby driving the rotating rod 5 to rotate, which in turn drives the cam 12 to rotate in the opposite direction, so that the farthest end of the outer edge of the cam 12 contacts an inner wall of the mounting groove 29 near the valve seat 1. During the contact process, the driving hollow sleeve 16 moves towards the ball 15, so that the inner wall of the sealing cavity 28 contacts and abuts the spherical surface of the ball 17, thereby creating a sealing state between the inner wall of the sealing cavity 28 and the spherical surface of the ball 17. This gives the valve seat 1 a better sealing effect in the fully closed state.

[0076] As is known, when the valve seat 1 needs to be fully closed, the valve stem 10 is rotated manually. This can lead to the valve stem 10 not rotating to its full position. When the operator fails to rotate the valve stem 10 to its full position, a gap exists between the inner wall of the sealing cavity 28 and the spherical surface of the ball 15. Fluid flows into the connecting cavity through this gap, and as the fluid continues to flow in, the liquid level in the connecting cavity gradually rises. This rise in liquid level generates buoyancy on the floating plug 13, driving it to move upwards. During this upward movement, the ball 26 rolls within the spiral rolling groove 20, and as the floating plug 13 moves upwards, it rotates. Since the floating plug 13 and the valve stem 10 are keyed, the rotation of the floating plug 13 will drive the valve stem 10 to rotate, ensuring that the valve stem 10 rotates to its full position. This minimizes the impact between the inner wall of the sealing cavity 28 and the spherical surface of the ball 15. The gap between the 15 surfaces is such that when the valve seat 1 is fully closed and the valve stem 10 is not fully rotated, the valve stem 10 can be actively rotated to maximize the sealing effect of the valve seat 1. In addition, the first spring 27 generates elastic preload on the mounting pin 22, so that when the ball 26 is obstructed in the spiral rolling groove 20, the ball 26 can avoid the obstructed position and roll smoothly through the contraction of the first spring 27. Furthermore, the mounting pin 22 can be limited by the stop pin 25 sliding in the oblong hole 24. In addition, since the stop pin 25 can only slide along the length of the oblong hole 24, the circumferential rotation of the mounting pin 22 can be restricted, and the mounting pin 22 can be prevented from sliding out of the sliding hole of the fixed sleeve 21, thereby causing the mounting pin 22 to detach from the sliding hole.

[0077] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hard-seal integrated forged steel ball valve, comprising a valve seat (1) with an internal valve cavity (19), wherein flange seats (3) are connected through both ends of the valve seat (1), a ball (15) is movably connected inside the valve cavity (19), and a valve stem (10) is fixedly connected to the ball (15), wherein the valve stem (10) extends through the valve seat (1) and can rotate freely, characterized in that, Also includes: A sliding cavity (18) is coaxially formed in the flange seat (3), and the sliding cavity (18) is connected to the valve cavity (19); A hollow sleeve (16) that is fitted into the sliding cavity (18) and can slide freely has a sealing cavity (28) at one end facing the valve cavity (19), and the sealing cavity (28) matches the shape of the ball (15). A drive mechanism for synchronously driving the hollow sleeve (16) to slide within the sliding cavity (18) when the sphere (15) rotates; The driving mechanism includes a rotating rod (5) that slides vertically through the flange seat (3), the rotating rod (5) penetrating the hollow sleeve (16) and being able to rotate freely; A cam (12) is fixedly mounted on the rotating rod (5). The hollow sleeve (16) has an installation groove (29) on its outer wall for mounting the cam (12). The installation groove (29) has a rectangular cross-section, and the farthest edge of the outer edge of the cam (12) contacts the inner wall of one side of the installation groove (29), so that when the cam (12) rotates, it can drive the hollow sleeve (16) to reciprocate along the flange seat (3) axially. A rotating unit used to synchronously drive the rotating rod (5) to rotate when the valve stem (10) rotates; The rotating unit includes: a mounting base (9) fixed to the valve seat (1), the valve stem (10) passing through the mounting base (9) and being able to rotate freely, and a sliding groove (11) provided in the mounting base (9), the length direction of the sliding groove (11) being parallel to the axial direction of the flange seat (3); A rack column (8) is engaged in the sliding groove (11) and can slide freely horizontally. A gear part (14) is provided on the valve stem (10). The rack column (8) meshes with the gear part (14). A rotating arm (6) is fixedly mounted on one end of the rotating rod (5) that extends out of the flange seat (3). A hinge rod (7) is hinged at both ends to the rotating arm (6) and the rack column (8), respectively. The valve seat (1) has a communicating cavity extending into the mounting base (9), and the interior of the communicating cavity is connected to the interior of the valve cavity (19). A floating plug (13) that can slide freely up and down is engaged in the communicating cavity. The floating plug (13) is slidably fitted onto the valve stem (10) and is keyed to the valve stem (10). The floating plug (13) is provided with a floating rotation unit, which is used to drive the valve stem (10) to rotate when the floating plug (13) moves up and down. The floating rotation unit includes: a fixed post (23) fixed to the upper end face of the floating plug (13); A fixing sleeve (21) is horizontally fixed to the fixing column (23); A mounting pin (22) is horizontally connected to the fixed sleeve (21). The mounting pin (22) is rotatably fitted with a ball (26) at one end facing the radially outer side of the floating plug (13). A spiral rolling groove (20) is provided on the inner wall of the communicating cavity for the ball (26) to engage. The ball (26) can roll freely in the spiral rolling groove (20).

2. The hard-seal integrated forged steel ball valve as described in claim 1, characterized in that, The valve seat (1) is provided with an installation port, and an end cap (2) for closing the installation port is detachably connected to the valve seat (1).

3. The hard-seal integrated forged steel ball valve as described in claim 1, characterized in that, The fixed sleeve (21) has a blind hole-shaped sliding hole. The mounting pin (22) is inserted into the sliding hole. A first spring (27) is installed in the sliding hole. The first spring (27) elastically abuts against the mounting pin (22).

4. The hard-seal integrated forged steel ball valve as described in claim 3, characterized in that, The mounting pin (22) is provided with a stop pin (25), and the fixing sleeve (21) is provided with a waist-shaped hole (24) for the stop pin (25) to be inserted. The length direction of the waist-shaped hole (24) is parallel to the sliding direction of the mounting pin (22).

5. The hard-seal integrated forged steel ball valve as described in claim 1, characterized in that, A second spring (4) is installed inside the sliding cavity (18), and the second spring (4) elastically abuts against the hollow sleeve (16).

6. The hard-seal integrated forged steel ball valve as described in claim 1, characterized in that, The surface of the sphere (15) is provided with a chrome plating layer.

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