A silicon nitride ceramic ball valve with a ball core sealing surface convenient to replace
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
- Filing Date
- 2023-10-18
- Publication Date
- 2026-07-14
Smart Images
Figure CN117419179B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of silicon nitride ceramic ball valves, and particularly relates to a silicon nitride ceramic ball valve that facilitates the replacement of the ball core sealing surface. Background Technology
[0002] Silicon nitride ceramics are inorganic ceramic materials that do not shrink during sintering. Silicon nitride has very high strength, especially hot-pressed silicon nitride, which is one of the hardest substances in the world. It possesses properties such as high strength, low density, and high temperature resistance. Si3N4 ceramics are covalent compounds with the basic structural unit being the [SiN4] tetrahedron. A silicon atom is located at the center of the tetrahedron, surrounded by four nitrogen atoms at the four vertices. These atoms share a single atom across three tetrahedra, forming a continuous and robust network structure in three-dimensional space. Silicon nitride ceramics are hard, inherently lubricating, and wear-resistant, forming an atomic crystal. They are also oxidation-resistant at high temperatures. Furthermore, they can withstand thermal shock; heated to over 1000°C in air, followed by rapid cooling and then rapid heating, they will not shatter. Due to these excellent properties, silicon nitride ceramics are frequently used to manufacture mechanical components such as bearings, turbine blades, mechanical seal rings, permanent molds, and silicon nitride ceramic ball valves.
[0003] Ball valves are mainly used in pipelines for shut-off, distribution, and changing the flow direction of media. Ball valves are the most commonly used valves. Ball valves usually adopt a soft-seal structure. If a ball valve leaks, it can only be replaced as a whole, which is not only cumbersome but also costly. Although silicon nitride ceramic ball valves have high strength and are very hard, the sealing surface of the ball core will be damaged by long-term friction between the sealing surface of the ball core and the sealing surface of the valve seat, causing the ball valve to leak. Damaged ball valves will result in high equipment repair costs, and sometimes the entire ball valve needs to be replaced, resulting in wasteful replacement costs.
[0004] Therefore, providing a silicon nitride ceramic ball valve with a replaceable ball core sealing surface is a problem that needs to be solved. Summary of the Invention
[0005] The purpose of this invention is to provide a silicon nitride ceramic ball valve that facilitates the replacement of the ball core sealing surface, thereby solving at least one of the problems mentioned in the background art.
[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:
[0007] In some embodiments of this application, a silicon nitride ceramic ball valve that facilitates replacement of the ball core sealing surface is provided, comprising:
[0008] The valve body has a fluid passage for fluid flow.
[0009] A valve seat is disposed in the valve body and fixedly connected to the valve body, and a valve seat sealing surface is provided on the valve seat;
[0010] A ball core is rotatably disposed in the valve body, and has a through hole that can communicate with the fluid channel. The ball core has a ball core sealing surface that abuts against the valve seat sealing surface.
[0011] Replace the valve stem, which is mounted on the valve body and connected to the ball core, for replacing the sealing surface of the ball core;
[0012] A fixed valve stem is provided on the valve body after the replacement valve stem replaces the ball core sealing surface. The fixed valve stem is connected to the ball core. The fixed valve stem has an internal hollow structure and is used to rotate the ball core to determine whether fluid flows through the valve body and the ball core.
[0013] A fixing component is disposed on the fixing valve stem and is used to fix the fixing valve stem to the ball core;
[0014] A valve stem replacement assembly is mounted on the valve body and connected to the valve body by bolts. It is used to disassemble, replace, and fix the valve stem when replacing the fixed valve stem and the replacement valve stem.
[0015] Preferably, in the above-described preferred embodiment of a silicon nitride ceramic ball valve with a replaceable ball core sealing surface, the ball core is provided with a fixing hole and a rotating groove.
[0016] Two fixing holes are provided, and the two fixing holes are perpendicular to each other and have their opening direction pointing towards the center of the ball. The fixing holes are used to place the end of the fixing valve stem, and the end of the fixing valve stem is fixed to the ball core through the fixing component and the fixing holes.
[0017] The rotating groove connects the two fixing holes and is disposed on the surface of the ball core. An arc-shaped toothed plate is provided on one side of the rotating groove and an arc-shaped limiting block is provided on the other side. The rotating groove is used to place the end of the replacement valve stem.
[0018] Preferably, in the above-mentioned preferred embodiment of a silicon nitride ceramic ball valve that facilitates the replacement of the ball core sealing surface, the ball core is provided with two ball core sealing surfaces, and the two ball core sealing surfaces are respectively arranged opposite to the two fixing holes.
[0019] Preferably, in the above-mentioned preferred embodiment of a silicon nitride ceramic ball valve that facilitates the replacement of the ball core sealing surface, the outer surface of the end of the replacement valve stem is provided with rotating teeth, which mesh with the arc-shaped toothed plate to cause the ball core to rotate when the replacement valve stem is rotated, thereby replacing the sealing surface of the ball core.
[0020] Preferably, in the preferred embodiment of the silicon nitride ceramic ball valve described above, which facilitates the replacement of the ball core sealing surface, the fixing assembly includes:
[0021] A rotating rod passes through the fixed valve stem and is disposed inside the fixed valve stem. One end of the rotating rod extends to the outside of the fixed valve stem and is rotatably connected to the fixed valve stem, while the other end extends to the inside of the fixed valve stem and is provided with a drive bevel gear.
[0022] Multiple support rods are provided, which are evenly spaced inside the fixed valve rod and are vertically fixed to the inner bottom wall of the fixed valve rod.
[0023] Multiple threaded rods are provided, corresponding to the number of support rods, and are disposed inside the fixed valve stem, perpendicular to the support rods. One end of the threaded rod passes through the end of the support rod and is rotatably connected to the end of the support rod. A driven bevel gear is provided on the threaded rod, which meshes with the driving bevel gear. The other end passes through the side wall of the fixed valve stem, and its end face is located on the same arc surface as the outer surface of the fixed valve stem.
[0024] Multiple fixing blocks are provided, corresponding to the number of threaded rods. They are installed on the threaded rods through the side wall of the fixing valve rod and are threadedly connected to the threaded rods. The end face of the fixing block is an arc surface with the same arc as the inner wall of the fixing hole. The outer surface of the fixing block is slidably connected to the side wall of the fixing valve rod. The end face of the fixing block is provided with an anti-slip pad.
[0025] Preferably, in the above-mentioned preferred embodiment of a silicon nitride ceramic ball valve that facilitates the replacement of the ball core sealing surface, the outer surfaces of the fixed valve stem and the replacement valve stem are provided with grooves, which are used to limit the fixed valve stem and the replacement valve stem after they are connected to the valve stem replacement assembly, so that the end of the fixed valve stem is just set in the fixed hole, and the rotating teeth of the replacement valve stem are just engaged with the arc-shaped toothed plate.
[0026] Preferably, in the preferred embodiment of the silicon nitride ceramic ball valve described above, which facilitates the replacement of the ball core sealing surface, the valve stem replacement assembly includes:
[0027] A semi-circular valve stem fixing component is provided in two parts, which are disposed opposite to each other in the groove on the outer surface of the fixed valve stem or the replacement valve stem. The sides of the two semi-circular valve stem fixing components abut against each other and are rotatably connected to the outer surface of the fixed valve stem or the replacement valve stem. The upper and lower ends of the semi-circular valve stem fixing component are provided with protrusions, and the lower end is fixed to the valve body by the protrusions and bolts.
[0028] A sealing element is disposed between the fixed valve stem or the replacement valve stem and the semi-arc valve stem fixing element, with one side abutting against the outer surface of the fixed valve stem or the replacement valve stem, and the other side being fixedly connected to the inner surface of the semi-arc valve stem fixing element.
[0029] Two snap-fit components are provided, positioned between the semi-circular valve stem fixing component and the fixed valve stem or the replacement valve stem. They are located within a groove on the outer surface of the fixed valve stem or the replacement valve stem, with their sides abutting against each other. The snap-fit components are bolted to the protrusion at the upper end of the semi-circular valve stem fixing component. The inner surfaces of the two snap-fit components are rotatably connected to the outer surface of the fixed valve stem or the replacement valve stem, thereby ensuring more stable rotation of the fixed valve stem and the replacement valve stem within the semi-circular valve stem fixing component.
[0030] Preferably, in the above-mentioned preferred embodiment of a silicon nitride ceramic ball valve that facilitates replacement of the ball core sealing surface, a sealing gasket is provided at the abutting point of the sides of the two semi-arc valve stem fixing members, and a sealing gasket is provided at the abutting point of the sides of the two snap-fit members. The sealing gaskets ensure the sealing of the connection between the two semi-arc valve stem fixing members and the two snap-fit members.
[0031] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: The ball valve is made of silicon nitride ceramic, which increases its hardness and makes it wear-resistant. It includes a fixed valve stem, a replaceable valve stem, and a valve stem replacement assembly. The valve stem replacement assembly allows for the replacement of both the fixed and replaceable valve stems. The replaceable valve stem engages with the arc-shaped toothed plate of the ball core. Rotating the replaceable valve stem causes the ball core to rotate, thereby replacing the sealing surface of the ball core. After the sealing surface is replaced, the valve stem is replaced with the fixed valve stem to control the opening and closing of the ball valve. This invention can replace the sealing surface of the ball core, solving the problem of damage to the ball core sealing surface caused by long-term friction between the ball core sealing surface and the valve seat sealing surface, leading to leakage in the ball valve. It also reduces the maintenance costs of silicon nitride ball valves, extends their service life, and lowers replacement costs. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0033] Figure 1 This is a schematic diagram of the silicon nitride ball valve when the fixed valve stem is installed in an embodiment of the present invention;
[0034] Figure 2As described in the embodiments of the present invention Figure 1 A schematic diagram of the structure of the fixing component at point a;
[0035] Figure 3 This is a schematic diagram of the silicon nitride ball valve during the installation and replacement of the valve stem in an embodiment of the present invention;
[0036] Figure 4 As described in the embodiments of the present invention Figure 3 A magnified view of a section at point b in the middle;
[0037] Figure 5 This is a schematic diagram of the structure of the sphere core in an embodiment of the present invention;
[0038] Figure 6 This is a top view of the valve stem replacement assembly structure in an embodiment of the present invention. Detailed Implementation
[0039] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0040] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0043] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.
[0044] See Figure 1-6 As shown, a silicon nitride ceramic ball valve with an easily replaceable ball core sealing surface according to an embodiment of this application is described, comprising:
[0045] Valve body 1, wherein a fluid channel is provided inside the valve body 1 for fluid flow;
[0046] Valve seat 2 is disposed inside the valve body 1 and is fixedly connected to the valve body 1. Valve seat 2 is provided with a valve seat sealing surface.
[0047] The ball core 3 is rotatably disposed inside the valve body 1, and has a through hole that can communicate with the fluid channel. The ball core has a ball core sealing surface, and the ball core sealing surface abuts against the valve seat sealing surface.
[0048] Replace the valve stem 5, which is mounted on the valve body 1 and connected to the ball core 3, for replacing the sealing surface of the ball core;
[0049] The fixed valve stem 4 is installed on the valve body 1 after the replacement valve stem 5 replaces the ball core sealing surface. It is connected to the ball core 3. The fixed valve stem 4 has an internal hollow structure and is used to rotate the ball core 3 to determine whether the fluid flows through the valve body 1 and the ball core 3.
[0050] The fixing component 6 is disposed on the fixing valve stem 4 and is used to fix the fixing valve stem 4 to the ball core 3.
[0051] The valve stem replacement assembly 7 is mounted on the valve body 1 and is bolted to the valve body 1. It is used to disassemble and fix the valve stem 4 and the replacement valve stem 5 when replacing them.
[0052] Specifically, the fixed valve stem 4 and the replacement valve stem 5 can be replaced and fixed through the valve stem replacement assembly 7. When replacing the valve stem 5, the sealing surface of the ball core 3 can be replaced. After the replacement is completed, the fixed valve stem 4 is replaced. The fixed valve stem 4 is fixedly connected to the ball core 3 through the fixing assembly 6. After the connection is completed, the opening and closing of the ball valve is determined by rotating the fixed valve stem 4.
[0053] To further optimize the above technical solution, the ball core 3 is provided with a fixing hole 31 and a rotating groove 32.
[0054] Two fixing holes 31 are provided. The two fixing holes 31 are perpendicular to each other and have their opening direction pointing towards the center of the ball. The fixing holes 31 are used to place the end of the fixing valve stem 4. The end of the fixing valve stem 4 is fixed to the ball stem 3 through the fixing component 6 and the fixing holes 31.
[0055] The rotating groove 32 is connected to the two fixing holes 31 and is disposed on the surface of the ball core 3. An arc-shaped toothed plate 321 is provided on one side of the rotating groove 32 and an arc-shaped limiting block 322 is provided on the other side. The rotating groove 32 is used to place the end of the replacement valve stem 5.
[0056] To further optimize the above technical solution, two ball core sealing surfaces are provided on the ball core 3, and the two ball core sealing surfaces are respectively arranged opposite to the two fixing holes 31.
[0057] It should be noted that the two ball core sealing surfaces are respectively arranged opposite to the two fixing holes 31, and the rotating groove 32 connects the two fixing holes 31. When the ball core sealing surface is replaced, when the valve stem 5 is rotated to the other fixing hole 31, the ball core sealing surface can be replaced with the other ball core sealing surface.
[0058] To further optimize the above technical solution, the outer surface of the end of the replacement valve stem 5 is provided with rotating teeth, which mesh with the arc-shaped toothed plate 321 to make the ball core 3 rotate when the replacement valve stem 5 is rotated, thereby replacing the ball core sealing surface.
[0059] Specifically, the arc-shaped limiting block 322 on the rotating groove 32 allows the rotating teeth on the replacement valve stem 5 to better mesh with the arc-shaped toothed plate 321, ensuring the stability of the rotation of the ball core 3 when the replacement valve stem 5 rotates, preventing the replacement valve stem 5 from moving left or right, which would affect the replacement of the sealing surface of the ball core 3. The replacement of the sealing surface of the ball core can better protect the ball valve and extend its service life.
[0060] To further optimize the above technical solution, the fixing component 6 includes:
[0061] A rotating rod 61 passes through the fixed valve stem 4 and is disposed inside the fixed valve stem 4. One end of the rotating rod 61 extends to the outside of the fixed valve stem 4 and is rotatably connected to the fixed valve stem 4, and the other end extends to the inside of the fixed valve stem 4 and is provided with a drive bevel gear 611.
[0062] Multiple support rods 62 are provided and are evenly spaced inside the fixed valve rod 4, and are vertically and fixedly connected to the inner bottom wall of the fixed valve rod 4.
[0063] Multiple threaded rods 63 are provided, corresponding to the number of support rods 62. They are disposed inside the fixed valve stem 4 and perpendicular to the support rods 62. One end of the threaded rod 63 passes through the end of the support rod 62 and is rotatably connected to the end of the support rod 62. A driven bevel gear 631 is provided on the threaded rod 631, which meshes with the driving bevel gear 611. The other end of the threaded rod 63 passes through the side wall of the fixed valve stem 4, and its end face is located on the same arc surface as the outer surface of the fixed valve stem 4.
[0064] Multiple fixing blocks 64 are provided, corresponding to the number of threaded rods 63. They are installed on the threaded rods 63 through the side wall of the fixing valve stem 4 and are threadedly connected to the threaded rods 63. The end face of the fixing block 64 is an arc surface with the same arc as the inner wall of the fixing hole 31. The outer surface of the fixing block 64 is slidably connected to the side wall of the fixing valve stem 4. The end face of the fixing block 64 is provided with an anti-slip pad 641.
[0065] It should be noted that multiple fixing blocks 64 and threaded rods 63 are evenly spaced and arranged in pairs opposite each other within the fixed valve stem 4 with the central axis of the fixed valve stem 4 as the center. This allows the resistance forces of the fixing blocks 64 on the ball core 3 to interact, thus better fixing the ball core 3. The fixing blocks 64 have a cuboid structure. When fixing the ball core 3, firstly, the rotating rod 61 is rotated to make the driving bevel gear 611 drive the driven bevel gear 631 to rotate, causing the threaded rod 63 to rotate. The fixing blocks 64 slide out and exert resistance forces on the ball core 3. When the rotating rod 61 cannot be easily rotated, the fixing of the ball core 3 by the fixed valve stem 4 is completed. The fixing blocks 64 are provided with anti-slip pads 641. When the ball valve is opened or closed by rotating the fixed valve stem 4, the anti-slip pads 641 play an anti-slip role, preventing the fixing blocks 64 from sliding relative to the ball core 3 and ensuring the normal operation of the ball valve.
[0066] To further optimize the above technical solution, the outer surfaces of the fixed valve stem 4 and the replacement valve stem 5 are provided with grooves, which are used to limit the fixed valve stem 4 and the replacement valve stem 5 after they are connected to the valve stem replacement assembly 7, so that the end of the fixed valve stem 4 is just set in the fixed hole 31, and the rotating teeth of the replacement valve stem 5 are just engaged with the arc-shaped toothed plate 321.
[0067] Specifically, grooves are provided on the outer surfaces of the fixed valve stem 4 and the replacement valve stem 5, so that the valve stem replacement assembly 7 is placed in the groove to fix the fixed valve stem 4 or the replacement valve stem 5. The valve stem replacement assembly 7 is set in the groove so that the groove plays a limiting role, so that the position where the valve stem extends to the valve core is exactly its working position. This ensures that the rotating teeth of the replacement valve stem 5 are engaged with the arc-shaped toothed plate 321, and that the end of the replacement valve stem 5 does not extend into the fixing hole 31 and miss the engagement with the arc-shaped toothed plate 321.
[0068] To further optimize the above technical solution, the valve stem replacement assembly 7 includes:
[0069] A semi-circular valve stem fixing component 71 is provided in two parts, which are respectively disposed in the grooves on the outer surface of the fixed valve stem 4 or the replacement valve stem 5. The sides of the two semi-circular valve stem fixing components 71 abut against each other and are rotatably connected to the outer surface of the fixed valve stem 4 or the replacement valve stem 5. The upper and lower ends of the semi-circular valve stem fixing component 71 are provided with protrusions, and its lower end is fixed to the valve body 1 by the protrusions and bolts.
[0070] A sealing element 72 is disposed between the fixed valve stem 4 or the replacement valve stem 5 and the semi-arc valve stem fixing element 71. One side of the sealing element 72 abuts against the outer surface of the fixed valve stem 4 or the replacement valve stem 5, and the other side is fixedly connected to the inner surface of the semi-arc valve stem fixing element 71.
[0071] Two snap-fit pieces 73 are provided, disposed between the semi-circular valve stem fixing piece 71 and the fixed valve stem 4 or the replacement valve stem 5. They are disposed in the groove on the outer surface of the fixed valve stem 4 or the replacement valve stem 5. The sides of the two snap-fit pieces 73 abut against each other and are fixedly connected to the protrusion at the upper end of the semi-circular valve stem fixing piece 71 by bolts. The inner surfaces of the two snap-fit pieces 73 are rotatably connected to the outer surface of the fixed valve stem 4 or the replacement valve stem 5, so as to make the fixed valve stem 4 and the replacement valve stem 5 rotate more stably within the semi-circular valve stem fixing piece 71.
[0072] It should be noted that when installing and fixing the fixed valve stem 4 and the replacement valve stem 5, the bolts between the snap-fit part 73 and the semi-arc valve stem fixing part 71 are removed, the snap-fit part 73 is taken off, and the bolts between the semi-arc valve stem fixing part 71 and the valve body 1 are removed, thereby removing the fixed valve stem 4. The replacement valve stem 5 is then installed. The two semi-arc valve stem fixing parts 71 are positioned opposite each other on the outer surface of the replacement valve stem 5. The snap-fit part 73 is placed in the groove, and the snap-fit part 73 is connected to the semi-arc valve stem fixing part 71 with bolts. Then, the end of the replacement valve stem 5 is inserted into the valve body 1, and the semi-arc valve stem fixing part 71 is fixed to the valve body 1 with bolts, thus completing the fixing of the replacement valve stem 5. Similarly, the fixing steps for the fixed valve stem 4 and the installation and disassembly steps for the replacement valve stem 5 are the same as above. By providing the sealing part 72, it is ensured that no leakage will occur after the valve stem is replaced, thus achieving a sealing effect between the valve body 1 and the valve stem.
[0073] To further optimize the above technical solution, a sealing gasket 711 is provided at the abutting point of the sides of the two semi-arc valve stem fixing members 71, and a sealing gasket 711 is provided at the abutting point of the sides of the two snap-fit members 73. The sealing gasket 711 ensures the sealing of the connection between the two semi-arc valve stem fixing members 71 and the two snap-fit members 73.
[0074] Specifically, when the two semi-circular valve stem fixing parts 71 and the two snap-fit parts 73 abut against each other, they are abutted by the sealing gasket 711 to prevent fluid leakage if the sealing part 72 is damaged or other situations occur during fluid passage. It can also increase the friction between the two semi-circular valve stem fixing parts 71 and the two snap-fit parts 73, so that the two semi-circular valve stem fixing parts 71 and the two snap-fit parts 73 abut against each other better.
[0075] Working Principle: When the ball valve has been used for a long time and the sealing surface of the ball core 3 is worn, the sealing surface of the ball core 3 needs to be replaced. First, rotate the rotating rod 61, causing the driving bevel gear 611 to drive the driven bevel gear 631 to rotate, thereby rotating the threaded rod 63. The fixing block 64 on the threaded rod 63 retracts into the fixed valve stem 4 as the threaded rod 63 rotates, thus releasing the fixed connection between the fixed assembly 6 and the fixed valve stem 4 and the ball core 3. Remove the bolts between the snap-fit part 73 and the semi-arc valve stem fixing part 71, remove the snap-fit part 73, and remove the bolts between the semi-arc valve stem fixing part 71 and the valve body 1, thereby removing the fixed valve stem 4. Install and replace the valve stem 5. Place the two semi-arc valve stem fixing parts 71 opposite each other on the outer surface of the replacement valve stem 5, place the snap-fit part 73 in the groove, and fix the snap-fit part 73 to the semi-arc valve stem with bolts. Connect component 71, then insert the end of the replacement valve stem 5 into the valve body 1, and fix the semi-arc valve stem fixing component 71 to the valve body 1 with bolts to complete the fixing of the replacement valve stem 5. At this time, the rotating teeth at the end of the replacement valve stem 5 mesh with the arc-shaped toothed plate 321 on the ball core 3. By rotating the replacement valve stem 5, the ball core 3 will rotate accordingly. When the ball core 3 is rotated to the position of the replacement valve stem 5 above another fixing hole 31, the replacement valve stem 5 cannot rotate, thus completing the replacement of the ball core sealing surface. Through the above disassembly and assembly steps, the replacement valve stem 5 is replaced with the fixed valve stem 4. Rotate the rotating rod 61 to make the driving bevel gear 611 of the rotating rod 61 drive the driven bevel gear 631 to rotate, causing the fixing block 64 to slide out. Multiple fixing blocks 64 apply force to the ball core 3, which serves to fix the ball core 3. After the ball core sealing surface is replaced, the opening and closing direction of the ball valve will be opposite to that before replacement.
[0076] The ball valve is made of silicon nitride ceramic, which gives it high hardness and wear resistance. It features a fixed valve stem 4, a replaceable valve stem 5, and a valve stem replacement assembly 7. The valve stem replacement assembly 7 allows for the replacement of both the fixed and replaceable valve stems. The replaceable valve stem 5 engages with the arc-shaped toothed plate 321 of the ball core 3. Rotating the replaceable valve stem 5 causes the ball core 3 to rotate, thus replacing the sealing surface of the ball core. After the sealing surface is replaced, the valve stem is replaced with the fixed valve stem 4 to control the opening and closing of the ball valve. This invention allows for the replacement of the ball core's sealing surface, solving the problem of damage to the ball core's sealing surface caused by prolonged friction between the ball core's sealing surface and the valve seat's sealing surface, leading to leakage. This reduces maintenance costs for silicon nitride ball valves, extends their service life, and lowers replacement costs.
[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0078] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A silicon nitride ceramic ball valve with easily replaceable ball core sealing surface, characterized in that, include: Valve body (1), wherein a fluid channel is provided inside the valve body (1) for fluid flow; A valve seat (2) is disposed inside the valve body (1) and is fixedly connected to the valve body (1). A valve seat sealing surface is provided on the valve seat (2). The ball core (3) is rotatably disposed inside the valve body (1), and has a through hole that can communicate with the fluid channel. The ball core (3) has a ball core sealing surface, and the ball core sealing surface abuts against the valve seat sealing surface. Replace the valve stem (5), which is set on the valve body (1) and connected to the ball core (3) for replacing the sealing surface of the ball core; The fixed valve stem (4) is installed on the valve body (1) after the replacement valve stem (5) replaces the sealing surface of the ball core. It is connected to the ball core (3). The fixed valve stem (4) has an internal hollow structure and is used to rotate the ball core (3) to determine whether the fluid flows through the valve body (1) and the ball core (3). A fixing component (6) is disposed on the fixing valve stem (4) for fixing the fixing valve stem (4) to the ball core (3); The valve stem replacement assembly (7) is mounted on the valve body (1) and is bolted to the valve body (1). It is used to disassemble, replace and fix the fixed valve stem (4) and the replacement valve stem (5) when replacing them. The ball core (3) is provided with a fixing hole (31) and a rotating groove (32); The fixing component (6) includes: A rotating rod (61) passes through the fixed valve stem (4) and is disposed inside the fixed valve stem (4). One end of the rotating rod (61) extends to the outside of the fixed valve stem (4) and is rotatably connected to the fixed valve stem (4). The other end extends into the fixed valve stem (4) and is provided with an active bevel gear (611). Multiple support rods (62) are provided and are evenly spaced inside the fixed valve rod (4) and are vertically fixed to the inner bottom wall of the fixed valve rod (4); Multiple threaded rods (63) are provided, corresponding to the number of support rods (62). They are located inside the fixed valve stem (4) and are perpendicular to the support rods (62). One end of the threaded rod passes through the end of the support rod (62) and is rotatably connected to the end of the support rod (62). A driven bevel gear (631) is provided on the threaded rod. The driven bevel gear (631) meshes with the driving bevel gear (611). The other end passes through the side wall of the fixed valve stem (4), and its end face is located on the same arc surface as the outer surface of the fixed valve stem (4). Multiple fixing blocks (64) are provided, corresponding to the number of threaded rods (63). They pass through the side wall of the fixing valve rod (4) and are threaded onto the threaded rod (63). Their end faces are arc surfaces with the same curvature as the inner wall of the fixing hole (31). The outer surface of the fixing block (64) is slidably connected to the side wall of the fixing valve rod (4). The end face of the fixing block (64) is provided with an anti-slip pad (641). The valve stem replacement assembly (7) includes: A semi-arc valve stem fixing component (71) is provided in two parts, which are respectively disposed in the groove on the outer surface of the fixed valve stem (4) or the replacement valve stem (5). The sides of the two semi-arc valve stem fixing components (71) abut against each other and are rotatably connected to the outer surface of the fixed valve stem (4) or the replacement valve stem (5). The upper and lower ends of the semi-arc valve stem fixing component (71) are provided with protrusions, and its lower end is fixed to the valve body (1) by the protrusions and bolts. A sealing element (72) is disposed between the fixed valve stem (4) or the replacement valve stem (5) and the semi-arc valve stem fixing element (71). One side of the sealing element is in contact with the outer surface of the fixed valve stem (4) or the replacement valve stem (5), and the other side is fixedly connected to the inner surface of the semi-arc valve stem fixing element (71). Two snap-fit pieces (73) are provided, which are disposed between the semi-arc valve stem fixing piece (71) and the fixed valve stem (4) or the replacement valve stem (5). They are disposed in the groove on the outer surface of the fixed valve stem (4) or the replacement valve stem (5). The sides of the two snap-fit pieces (73) abut against each other and are fixedly connected to the protrusion at the upper end of the semi-arc valve stem fixing piece (71) by bolts. The inner surfaces of the two snap-fit pieces (73) are rotatably connected to the outer surface of the fixed valve stem (4) or the replacement valve stem (5) to make the fixed valve stem (4) and the replacement valve stem (5) rotate more stably in the semi-arc valve stem fixing piece (71).
2. The silicon nitride ceramic ball valve with easily replaceable ball core sealing surface according to claim 1, characterized in that, There are two fixing holes (31). The two fixing holes (31) are set on the ball core (3) with their opening direction pointing to the center of the ball and perpendicular to each other. The fixing holes (31) are used to place the end of the fixing valve stem (4). The end of the fixing valve stem (4) is fixed to the ball core (3) through the fixing component (6) and the fixing holes (31). The rotating groove (32) is connected to the two fixing holes (31) and is set on the surface of the ball core (3). An arc-shaped toothed plate (321) is provided on one side of the rotating groove (32) and an arc-shaped limiting block (322) is provided on the other side. The rotating groove (32) is used to place the end of the replacement valve stem (5).
3. A silicon nitride ceramic ball valve with easily replaceable ball core sealing surface according to claim 2, characterized in that, The ball core (3) is provided with two ball core sealing surfaces, and the two ball core sealing surfaces are respectively arranged opposite to the two fixing holes (31).
4. A silicon nitride ceramic ball valve with easily replaceable ball core sealing surface according to claim 2, characterized in that, The outer surface of the end of the replacement valve stem (5) is provided with rotating teeth, which mesh with the arc-shaped toothed plate (321) to make the ball core (3) rotate when the replacement valve stem (5) is rotated, thereby replacing the ball core sealing surface.
5. A silicon nitride ceramic ball valve with easily replaceable ball core sealing surface according to claim 4, characterized in that, The outer surfaces of the fixed valve stem (4) and the replacement valve stem (5) are provided with grooves, which are used to limit the fixed valve stem (4) and the replacement valve stem (5) after they are connected to the valve stem replacement assembly (7), so that the end of the fixed valve stem (4) is just set in the fixed hole (31), and the rotating teeth of the replacement valve stem (5) are just engaged with the arc-shaped toothed plate (321).
6. A silicon nitride ceramic ball valve with easily replaceable ball core sealing surface according to claim 1, characterized in that, A sealing gasket (711) is provided at the abutting point of the two semi-circular valve stem fixing parts (71), and a sealing gasket (711) is provided at the abutting point of the two snap-fit parts (73). The sealing gasket (711) ensures the sealing of the connection between the two semi-circular valve stem fixing parts (71) and the two snap-fit parts (73).