Water inlet ball valve sand-proof and wear-resistant sealing structure

Abstract

This invention discloses a sand-proof and wear-resistant sealing structure for an inlet ball valve, relating to the field of ball valve technology. It includes a valve body, valve seat, ball, and main valve stem. An inlet pipe and an outlet pipe are respectively provided on both sides of the valve body. Two mounting slots are formed in the middle of the valve body, with a first pressure cap and a second pressure cap installed inside each slot. The main valve stem is rotatably mounted on the first pressure cap, and its lower end is driven to the ball to rotate it. A secondary valve stem is rotatably mounted on the second pressure cap. This invention, by setting up a grinding block driven by the ball and a fixed grinding table, can actively crush hard particles such as sand and gravel that intrude into a specific area of ​​the valve cavity during valve opening and closing. This fundamentally eliminates the possibility of these particles continuously abrading the main sealing surface of the ball and the valve seat, achieving a shift from passive defense to active control. Furthermore, a collection cylinder is used to collect the crushed sand and mud, reducing the continuous wear of the ball by sand and mud.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and specifically to a sand-proof and wear-resistant sealing structure for an inlet ball valve. Background Technology

[0002] A ball valve is a type of valve that opens and closes by rotating a ball. It has the advantages of low fluid resistance, reliable sealing, and convenient operation, and is widely used in water inlet pipelines in water conservancy, municipal, and industrial fields. The core of its sealing performance lies in the sealing pair formed by the ball and the valve seat.

[0003] Traditional ball valve sealing structures are mainly divided into two categories: soft seals (such as PTFE and rubber) and hard seals (such as metal-to-metal). Soft seals rely on the elastic deformation of materials to achieve a tight fit, with good initial sealing performance, but poor wear resistance. Although hard seals are more wear-resistant, they still face the problem of leakage caused by scratches on the sealing surface in media containing solid particles.

[0004] When the influent contains solid particles such as silt, these particles will enter the valve cavity along with the medium. During the opening, closing, and adjustment of the ball valve, the relative rotation between the ball and the valve seat will carry these particles, causing continuous abrasive wear on the sealing surface and greatly shortening the service life of the valve. More importantly, some particles may invade and remain at the sealing interface, and be crushed under high pressure, directly scratching the sealing surface and causing sealing failure. Most existing technologies address this by increasing the hardness of the sealing surface material or optimizing the geometry of the sealing pair, but they still cannot effectively deal with particles that have invaded the valve cavity and participated in the wear process. This results in continuous wear during the use of the ball valve as the ball rotates, which is only a temporary solution. Summary of the Invention

[0005] The purpose of this invention is to provide a sand-proof and wear-resistant sealing structure for a water inlet ball valve, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A sand-proof and wear-resistant sealing structure for an inlet ball valve includes a valve body, a valve seat, a ball, and a main valve stem. An inlet pipe and an outlet pipe are respectively provided on both sides of the valve body. Two mounting slots are formed in the middle of the valve body, and a first pressure cap and a second pressure cap are respectively installed inside the two mounting slots. The main valve stem is rotatably mounted on the first pressure cap, and its lower end is driven to the ball to rotate it. A secondary valve stem is rotatably mounted on the second pressure cap and is driven to the ball. A groove is formed on the inner wall of the valve body near the second pressure cap, and a grinding table is fixedly connected inside the groove. A grinding block is fixedly connected to the outer wall of the ball away from the main valve stem, and the grinding block cooperates with the grinding table to crush sand and gravel. The second pressure cap is a hollow structure, and its opening is detachably connected to a collection cylinder via threads. A sealing ring is provided at the connection between the second pressure cap and the collection cylinder. Several through grooves are formed on the side wall of the second pressure cap.

[0008] By adopting the above technical solution, and by setting up a grinding block driven by the ball and a fixed grinding table, hard particles such as sand and gravel that have entered a specific area of ​​the valve cavity can be actively crushed during the valve opening and closing process. This fundamentally eliminates the possibility that these particles will continue to wear down the main sealing surface of the ball and the valve seat as abrasives, and realizes the transformation from passive defense to active management.

[0009] A further improvement of the technical solution of the present invention is as follows: a piston cylinder is fixedly connected to one side of the valve body, an exhaust pipe is provided at the top of the piston cylinder, a piston plate is slidably connected between the inner walls of the piston cylinder, a return spring is fixedly connected between the top of the piston plate and the top of the inner wall of the piston cylinder, an input pipe and an output pipe are provided on the piston cylinder, the input pipe communicates with the interior of the second pressure cover, a one-way valve is provided inside both the input pipe and the output pipe, the output pipe is connected to the water outlet pipe of the valve body through a control component, the control component is used to control the opening and closing between the output pipe and the water outlet pipe; the control component is linked with the main valve stem; a filter component is provided at the position where the input pipe is connected inside the second pressure cover.

[0010] By employing the above technical solution, a self-powered particle removal system is constructed by setting up a piston cylinder, a return spring, and input and output pipes with one-way valves, and a control component linked to the main valve stem. When the ball rotates to the intermediate state, it automatically uses the inlet water pressure to force the fluid containing broken particles into the second pressure cap cavity. After passing through the filtration component that removes silt, clean water enters the piston cylinder to store energy, while silt is trapped in the collection cylinder. When the valve is fully closed, the linked control component automatically changes the passage, allowing the piston cylinder to smoothly discharge the temporarily stored clean water under the action of the return spring. This design intelligently binds the cleaning action with the valve operation status, which not only significantly improves the initiative and reliability of particle removal in the grinding area, but also effectively prevents silt from entering the downstream pipeline through the method of filtering before discharging. The entire process structure requires no external power.

[0011] A further improvement of the technical solution of the present invention is that: the control component includes an annular groove opened in the middle of the first pressure cover, a valve block is fixedly connected to the outer wall of the main valve stem inside the annular groove, the valve block matches the shape of the annular groove, a through valve hole is opened on the valve block, and a through hole connected to the annular groove is opened on both sides of the first pressure cover, one of the through holes is connected to the output pipe, and the other through hole is connected to the water outlet pipe through a transfer pipe.

[0012] By employing the above technical solution, and specifically defining the control component as a structure including an annular groove, valve block, valve orifice, and guide hole, highly reliable and precise mechanical synchronization between fluid passage switching and valve spindle operation is achieved. This design directly fixes the valve block of the control passage to the main valve stem, ensuring that the rotation angle of the valve block perfectly matches the rotation angle of the ball. When the valve operation causes the ball to be fully closed, the valve orifice on the valve block rotates precisely to align with the two guide holes, thus automatically establishing a discharge passage; in any other position, the passage is reliably cut off. This integrated mechanical design eliminates the need for independent sensors or actuators, resulting in a compact structure and error-free operation. It fundamentally guarantees the absolute precision of the system's operating timing and eliminates the need for electrical control, thereby improving the device's practicality.

[0013] A further improvement of the technical solution of the present invention is that: a guide bucket is fixedly connected inside the second pressure cap, the guide bucket is funnel-shaped, and the connection part between the input pipe and the second pressure cap is located between the top and bottom of the guide bucket.

[0014] By employing the above technical solution, and by setting a funnel-shaped guide bucket inside the second pressure cap and limiting the connection position of the inlet pipe, efficient convergence and guidance of the inflowing fluid are achieved. The funnel shape of the guide bucket forms a converging flow channel from the top opening to the bottom outlet, which can naturally guide and converge the particulate-containing fluid entering the cavity of the second pressure cap from the surrounding channels to its bottom center area. Since the inlet of the inlet pipe is limited to the top and bottom of the guide bucket, it is located precisely on the main path of the converged fluid, which significantly increases the probability and efficiency of the fluid and its carried particles entering the inlet pipe. This improvement ensures that the ground and crushed particles can be transported to the subsequent filtration and collection stage more quickly and thoroughly, reducing unnecessary residence and deposition of particles inside the second pressure cap, thereby improving the cleaning efficiency and reliability of the entire system.

[0015] A further improvement of the technical solution of the present invention is that: the filter assembly includes an inner mesh frame and an outer mesh frame, the inner mesh frame and the outer mesh frame are fixedly connected by a connecting rod, the inner side wall of the inner mesh frame is provided with threads, the lower part of the guide bucket is provided with threads, the inner mesh frame and the threaded part of the guide bucket are connected by threaded engagement, and a filter screen is provided between the inner mesh frame and the outer mesh frame.

[0016] By adopting the above technical solution, and specifically defining the filter assembly as a mesh frame structure comprising a threaded inner mesh frame, an outer mesh frame, a connecting rod, and a filter screen, and connecting it to the flow guide bucket via a threaded connection, a balance between high filtration efficiency and ease of maintenance is achieved. The effect is that this structure can effectively intercept solid particles through the filter screen before the fluid enters the inlet pipe, protecting downstream precision components; simultaneously, the threaded connection makes the entire filter assembly an independent, detachable functional module. When the filter screen becomes clogged or requires cleaning, there is no need to disassemble the valve body or use complex tools; maintenance or replacement can be performed simply by unscrewing the entire mesh frame, simplifying the maintenance process, reducing long-term maintenance costs, and ensuring the reliability of continuous system operation.

[0017] A further improvement of the technical solution of the present invention is that: the top of the grinding table has a centrally concave structure; the lower part of the grinding block has a conical structure, and the gap between the grinding table and the grinding block gradually decreases from top to bottom.

[0018] By adopting the above technical solution, a highly efficient progressive crushing chamber is constructed by defining the grinding table as a centrally concave structure and the lower part of the grinding block as a conical structure, and ensuring that the gap between the two gradually decreases from top to bottom. This geometric design allows the sand and mud to enter the crushing working area more easily through the larger opening at the top, avoiding the problem of sand and mud not being able to enter due to too small gaps. Secondly, the gradually changing gap facilitates the capture of particles of different sizes. Subsequently, as the particles move downward with the water flow or gravity into the grinding area, the continuously converging gap between the conical block and the concave surface generates gradually increasing compressive and shear forces on the particles until they are completely crushed. This structure overcomes the problems of particle escape or being subjected to single-point compression that may occur with parallel gaps, greatly improving the crushing efficiency and reliability per unit action, and ensuring that the particle size entering the subsequent collection stage is smaller and less prone to clogging or wear.

[0019] A further improvement of the technical solution of the present invention is that: multiple strip-shaped grinding grooves radiating outward from the center of the concave structure are opened on the concave structure working surface of the grinding table; the conical structure working surface of the grinding block is a rough surface formed by hardening treatment.

[0020] By adopting the above technical solution, a highly efficient dynamic grinding pair, similar to a stone mill, is created by designing the working surface of the grinding table with radially distributed strip grinding grooves and combining them with the hardened rough surface of the grinding block. The radially distributed strip grinding grooves form a clear flow channel from the grinding center area to the periphery. When the ball rotates, the sand and gravel particles trapped in the convergence gap are crushed and scraped by the rough surface above, while being forcibly guided and transported to the periphery by these radial grooves. This design significantly enhances the retention and processing time of particles in the crushing area, ensuring multiple compound crushing effects. At the same time, its natural radial chip removal channel can use centrifugal force and water flow to quickly carry the crushed fine chips away from the core sealing area, effectively preventing secondary accumulation and repeated wear of chips. Thus, while improving crushing efficiency, it greatly improves the system's self-cleaning ability and working continuity.

[0021] A further improvement of the technical solution of the present invention is that the diameter of the output tube is smaller than that of the input tube.

[0022] By adopting the above technical solution, and setting the diameter of the output pipe to be smaller than that of the input pipe, effective physical flow restriction is achieved on the fluid discharge velocity during the piston cylinder reset phase. When the reset spring pushes the piston plate to discharge the clean water in the cylinder to the outlet pipe, the relatively smaller diameter of the output pipe increases the local resistance to fluid flow, thus controlling the reset speed of the piston plate and achieving slow and stable discharge. This slow reset offers several advantages: First, it eliminates the pressure shock and pipe vibration that may occur with rapid drainage, improving the stability and quietness of the system operation; second, the gentle flow rate ensures that the discharge process does not interfere with downstream pipelines or equipment.

[0023] A further improvement to the technical solution of the present invention is that the collecting cylinder is set as a transparent cylinder.

[0024] By adopting the above technical solution, and by specifically defining the collection cylinder as a transparent cylinder, a direct and reliable status observation window is added to the entire system. Operators or maintenance personnel do not need to use any special tools or disassemble parts; they can intuitively and in real time understand the sedimentation height and accumulation of silt inside the collection cylinder simply by visual observation, thereby accurately determining when cleaning and maintenance are needed.

[0025] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0026] 1. This invention provides a sand-proof and wear-resistant sealing structure for an inlet ball valve. By setting a grinding block driven by the ball and a fixed grinding table, hard particles such as sand and gravel that have entered a specific area of ​​the valve cavity can be actively crushed during the valve opening and closing process. This fundamentally eliminates the possibility of these particles continuously abrading the main sealing surface of the ball and the valve seat as abrasives, and realizes the transformation from passive defense to active management.

[0027] 2. This invention provides a sand-proof and wear-resistant sealing structure for an inlet ball valve. By setting a piston cylinder, a return spring, and an input and output pipe with a one-way valve, and a control component linked with the main valve stem, a self-powered particle removal system is constructed. When the ball rotates to the intermediate state, it can automatically use the inlet water pressure to force the fluid containing broken particles into the second pressure cover cavity, and after passing through the filtration component for removing mud and sand, clean water enters the piston cylinder to store energy, while mud and sand are intercepted in the collection cylinder.

[0028] 3. This invention provides a sand-proof and wear-resistant sealing structure for an inlet ball valve. By specifically defining the control component as a structure including an annular groove, a valve block, a valve orifice, and a guide hole, highly reliable and precise mechanical synchronization between fluid passage switching and valve spindle operation is achieved. This design directly fixes the valve block of the control passage to the main valve stem, so that the rotation angle of the valve block is completely consistent with the rotation angle of the ball. When the valve operation causes the ball to be fully closed, the valve orifice on the valve block rotates precisely to the position aligned with the two guide holes, thereby automatically establishing a discharge passage. In any other position, the passage is reliably cut off. The process does not require electrical control, thus improving the practicality of the device.

[0029] 4. This invention provides a sand-proof and wear-resistant sealing structure for a water inlet ball valve. By defining the grinding table as a centrally recessed structure and the lower part of the grinding block as a conical structure, and ensuring that the gap between the two gradually decreases from top to bottom, an efficient progressive crushing chamber is constructed. This geometric design allows sand and mud to enter the crushing working area more easily through a larger opening at the top, avoiding the problem of sand and mud being unable to enter due to too small a gap.

[0030] 5. This invention provides a sand-proof and wear-resistant sealing structure for an inlet ball valve. By designing the working surface of the grinding table to have radially shaped grinding grooves and combining it with the hardened rough surface of the grinding block, a highly efficient dynamic grinding pair similar to a stone mill is created. The radially distributed strip-shaped grinding grooves form a clear flow channel from the grinding center area to the periphery. When the ball rotates, the sand and gravel particles trapped in the convergence gap are crushed and scraped by the rough surface above, while being forcibly guided and transported to the periphery by these radial grooves. This design significantly enhances the retention and processing time of particles in the crushing area, ensuring multiple compound crushing effects. Attached Figure Description

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the overall structure of the ball valve of the present invention;

[0033] Figure 2 This is a schematic diagram of the main cross-sectional structure of the ball valve of the present invention;

[0034] Figure 3 This is one of the schematic diagrams showing the disassembled structure of the main valve stem, ball, and second pressure cap of the present invention;

[0035] Figure 4 This is a second schematic diagram showing the disassembled structure of the main valve stem, ball, and second pressure cap of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the flow guide bucket and filter assembly of the present invention;

[0037] Figure 6 This is a schematic diagram of the control component of the present invention in two different states;

[0038] Figure 7 This is a schematic diagram of the right-side cross-sectional structure of the present invention;

[0039] Figure 8 This is a schematic diagram showing the direction of water flow when the sphere of the present invention is in three torsional states;

[0040] Figure 9 This is a schematic diagram of the main cross-sectional structure of the valve body of the present invention;

[0041] Figure 10 For the present invention Figure 7 Enlarged view of point A in the middle;

[0042] Figure 11 This is a schematic diagram of the grinding table of the present invention.

[0043] In the diagram: 1. Valve body; 2. Valve seat; 3. First gland; 4. Second gland; 5. Ball; 6. Main valve stem; 7. Grinding block; 8. Grinding table; 9. Collection cylinder; 10. Through groove; 11. Guide bucket; 12. Filter assembly; 1201. Inner mesh frame; 1202. Outer mesh frame; 1203. Connecting rod; 1204. Filter screen; 13. Secondary valve stem; 14. Piston cylinder; 15. Inlet pipe; 16. Outlet pipe; 17. Exhaust pipe; 18. Return spring; 19. Piston plate; 20. Annular groove; 21. Inlet pipe; 22. Outlet pipe; 23. Valve block; 24. Valve hole; 25. Adaptor pipe; 26. Grinding groove. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to the embodiments.

[0045] Example 1

[0046] like Figures 1-11As shown, this invention provides a sand-proof and wear-resistant sealing structure for an inlet ball valve, including a valve body 1, a valve seat 2, a ball 5, and a main valve stem 6. An inlet pipe 21 and an outlet pipe 22 are respectively provided on both sides of the valve body 1. Two mounting slots are formed in the middle of the valve body 1, and a first pressure cover 3 and a second pressure cover 4 are respectively installed inside the two mounting slots. The main valve stem 6 is rotatably mounted on the first pressure cover 3, and its lower end is driven to connect to the ball 5 to drive the ball 5 to rotate. A secondary valve stem is rotatably mounted on the second pressure cover 4. 13. The auxiliary valve stem 13 is driven to connect with the ball 5; a groove is provided on the inner wall of the valve body 1 near the second pressure cover 4, and a grinding table 8 is fixedly connected inside the groove; a grinding block 7 is fixedly connected on the outer wall of the ball 5 away from the main valve stem 6, and the grinding block 7 cooperates with the grinding table 8 to crush sand and gravel; the second pressure cover 4 is set as a hollow structure, and the opening is detachably connected to the collection cylinder 9 by a thread; a sealing ring is provided at the connection between the second pressure cover 4 and the collection cylinder 9; several through grooves 10 are provided on the side wall of the second pressure cover 4.

[0047] In this embodiment, by setting a grinding block 7 driven by the ball 5 and a fixed grinding table 8, hard particles such as sand and gravel that have entered a specific area of ​​the valve cavity can be actively crushed during the opening and closing of the valve. This fundamentally eliminates the possibility that these particles will continuously wear down the main sealing surface of the ball 5 and the valve seat 2 as abrasives, and realizes the transformation from passive defense to active management.

[0048] Furthermore, by setting a hollow second pressure cap 4 with a through groove 10 and a detachable collection cylinder 9, the crushed or free fine particles can enter the collection cylinder 9 through the through groove 10 under the action of water flow and be collected in a concentrated manner, effectively preventing the crushed particles from re-entering the main channel or sealed area and causing secondary wear or blockage.

[0049] Furthermore, the ball 5 is supported at both ends by the main valve stem 6 and the auxiliary valve stem 13, making its operation more stable. The collection cylinder 9 adopts a threaded connection and is equipped with a sealing ring, which not only ensures the sealing of the collection chamber, but also makes it very convenient to clean the sediment regularly, reducing the difficulty and cost of maintenance.

[0050] The grinding block 7 and the surface of the grinding table 8 form a non-contact fit. The gap between the two gradually decreases from top to bottom, with the upper gap ranging from 1.0mm to 3.0mm and the lower gap ranging from 0.2mm to 0.8mm. The two will not hinder normal use when not grinding mud and sand.

[0051] When the drive device (such as a handwheel or actuator) drives the main valve stem 6 to rotate, the main valve stem 6 transmits torque to the ball 5, causing the ball 5 to rotate within the valve cavity, thus opening or closing the ball valve. The grinding block 7, fixed to the bottom surface of the ball 5, rotates along with the ball 5. When sand and gravel particles in the medium move with the water flow to the groove area on one side of the valve body 1, the rotating grinding block 7 and the grinding table 8 fixed in the groove form relative motion and gap changes, generating crushing and shearing action on the particles located therein, breaking them up. The crushed fine particles and other impurities in the valve cavity, driven by the water flow within the valve cavity, enter its cavity through the through groove 10 on the side wall of the second pressure cover 4, and finally settle in the collection cylinder 9 connected by threads at the bottom. The sealing ring ensures the seal at the connection of the collection cylinder 9, preventing medium leakage. When cleaning is required, simply close the valve and depressurize to unscrew the collection cylinder 9 and remove the accumulated mud and sand.

[0052] Reference Figure 8 The diagram illustrates three different states of the ball 5. The left side shows the ball valve closed, where the solid part of the ball 5 blocks the interior of the valve body 1, preventing water from the inlet pipe 21 from flowing into the outlet pipe 22. The middle state shows the ball 5 in its intermediate position, where water entering from the inlet pipe 21 not only flows through the channel on the ball 5 to the outlet pipe 22 but also diffuses into the interior of the valve body 1. The right side shows the ball valve fully open, where water from the inlet pipe 21 flows directly into the outlet pipe 22 through the ball 5. Therefore, when the ball 5 rotates to the middle state (between fully open and fully closed), both the inlet pipe 21 and the outlet pipe 22 are connected to the chamber inside the valve body 1, allowing sediment to seep into the valve cavity.

[0053] like Figure 3 and Figure 4 As shown, the drive connection specifically involves a square rod engaging with a square slot. The square rod can be quickly inserted into the square slot, and the rotation of the square rod can drive the main body with the square slot to rotate. For example, by rotating the main valve rod 6, the ball 5 can rotate due to the interaction between the square rod at its end and the square slot on the ball 5.

[0054] Example 2

[0055] like Figure 7 and Figure 10As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, a piston cylinder 14 is fixedly connected to one side of the valve body 1, an exhaust pipe 17 is provided at the top of the piston cylinder 14, a piston plate 19 is slidably connected between the inner walls of the piston cylinder 14, a return spring 18 is fixedly connected between the top of the piston plate 19 and the top of the inner wall of the piston cylinder 14, an input pipe 15 and an output pipe 16 are provided on the piston cylinder 14, the input pipe 15 communicates with the interior of the second pressure cover 4, a one-way valve is provided inside both the input pipe 15 and the output pipe 16, the output pipe 16 is connected to the water outlet pipe 22 of the valve body 1 through a control component, the control component is used to control the opening and closing between the output pipe 16 and the water outlet pipe 22; the control component is linked with the main valve stem 6; a filter component 12 is provided at the position where the input pipe 15 is connected inside the second pressure cover 4.

[0056] The crushed particles mainly rely on the natural flow of water in the valve cavity to enter the collection cylinder 9 through the through groove 10. This method is inefficient when the flow rate is low or the particles settle quickly, which may result in some particles remaining near the grinding area.

[0057] In this embodiment, a self-powered particle removal system is constructed by setting up a piston cylinder 14, a return spring 18, and an input pipe 15 and an output pipe 16 with one-way valves, and a control component linked to the main valve stem 6. When the ball 5 rotates to the intermediate state, it can automatically use the inlet water pressure to force the fluid containing broken particles into the cavity of the second pressure cover 4, and after passing through the filtration component 12 to remove silt, clean water enters the piston cylinder 14 to store energy, while silt is intercepted in the collection cylinder 9. When the valve is completely closed, the linked control component automatically changes the passage, so that the piston cylinder 14 smoothly discharges the temporarily stored clean water under the action of the return spring 18. This design intelligently binds the cleaning action with the valve operation state, which not only greatly improves the initiative and reliability of particle removal in the grinding area, but also effectively prevents silt from entering the downstream pipeline by filtering first and then discharging. The entire process structure does not require external power.

[0058] Secondly, in the above scheme, since the process of pressurizing water into the piston cylinder 14 occurs when the valve body 1 is just opened, this design can also function as a breather valve to avoid the system being damaged by sudden changes in water pressure.

[0059] Specifically, when the main valve stem 6 drives the ball 5 to rotate from the fully open or fully closed position to the middle state, the channel on the ball 5 forms a brief connection with the inlet pipe 21 and the valve cavity. The high-pressure medium enters the valve cavity and flows through the grinding area, carrying the crushed particles through the through groove 10 of the second pressure cover 4 into its cavity. At this time, the control component linked with the main valve stem 6 keeps the passage between the output pipe 16 and the outlet pipe 22 closed. When the fluid containing particles flows to the inlet of the input pipe 15, it first passes through the filter component 12, where the mud and sand particles are intercepted and fall into the collection cylinder 9 below. The filtered clean water enters the bottom of the piston cylinder 14 through the input pipe 15 (whose internal one-way valve allows the medium to flow into the piston cylinder 14), pushing the piston plate 19 to compress the return spring 18 and move upward to complete the energy storage. When the main valve stem 6 continues to rotate and the ball 5 reaches the fully closed position, the passage between the valve chamber and the inlet pipe 21 is cut off. At the same time, the linked control components act to open the passage between the output pipe 16 and the outlet pipe 22. At this time, the pressure at the bottom of the piston cylinder 14 is released, and the return spring 18 pushes the piston plate 19 downward to reset, so that the clean water temporarily stored in the piston cylinder 14 is discharged through the output pipe 16 (whose internal one-way valve allows fluid to flow out of the piston cylinder 14) to the outlet pipe 22, and the system returns to the standby state.

[0060] like Figure 6 , Figure 7 and Figure 9 As shown, preferably, the control component includes an annular groove 20 formed in the middle of the first pressure cover 3. A valve block 23 is fixedly connected to the outer wall of the main valve stem 6 inside the annular groove 20. The valve block 23 matches the shape of the annular groove 20. A through valve hole 24 is formed on the valve block 23. A through hole connected to the annular groove 20 is formed on both sides of the first pressure cover 3. One through hole is connected to the output pipe 16, and the other through hole is connected to the water outlet pipe 22 through the adapter pipe 25.

[0061] The above solution requires the control component to be linked with the on / off state of ball 5. If it is controlled electronically, it will increase the cost and limitations of implementation.

[0062] In this embodiment, by specifically defining the control component as a structure including an annular groove 20, a valve block 23, a valve orifice 24, and a through hole, highly reliable and precise mechanical synchronization between fluid passage switching and valve spindle operation is achieved. This design directly fixes the valve block 23 of the control passage to the main valve stem 6, ensuring that the rotation angle of the valve block 23 is completely consistent with the rotation angle of the ball 5. When the valve operation causes the ball 5 to be fully closed, the valve orifice 24 on the valve block 23 rotates precisely to align with the two through holes, thereby automatically establishing a discharge passage; in any other position, the passage is reliably cut off. This integrated mechanical design eliminates the need for independent sensors or actuators, resulting in a compact structure and error-free operation. It fundamentally guarantees the absolute precision of the system's operating timing in the above scheme and eliminates the need for electrical control, thus improving the practicality of the device.

[0063] like Figure 6 As shown, when the external drive device rotates the main valve stem 6, the valve block 23 fixed on the outer wall of the main valve stem 6 rotates synchronously in the annular groove 20. The valve block 23 divides the annular groove 20 into two independent chambers: when the ball 5 (and the valve block 23 that rotates synchronously with it) is at any angle other than the fully closed position, the solid wall of the valve block 23 will block the two through holes, so that the fluid passage between the output pipe 16 and the water outlet pipe 22 is completely blocked. At this time, the control component is in the off state. When the main valve stem 6 rotates to the ball 5 reaching the fully closed position, the valve block 23 also rotates to a specific angle, so that the through valve hole 24 opened on it is exactly aligned with the two through holes on both sides of the first pressure plate 3. At this time, the valve hole 24, the annular groove 20 and the two through holes together form a continuous fluid passage, connecting the output pipe 16 and the water outlet pipe 22. The control component switches to the open state, allowing the fluid in the piston cylinder 14 to be discharged through this passage. The water finally flows into the water outlet pipe 22 from the adapter pipe 25.

[0064] like Figure 2 , Figure 7 and Figure 10 As shown, preferably, a flow guide 11 is fixedly connected inside the second pressure cap 4. The flow guide 11 is funnel-shaped, and the connection between the input pipe 15 and the second pressure cap 4 is located between the top and bottom of the flow guide 11.

[0065] The particulate fluid entering the inner cavity of the second gland 4 from the grinding area flows in a divergent direction, which easily causes the particles to escape in all directions, rather than all of them effectively flowing to the inlet of the input pipe 15 and being filtered and collected.

[0066] In this embodiment, by fixing a funnel-shaped guide hopper 11 inside and defining the connection position of the inlet pipe 15, efficient convergence and guidance of the inflowing fluid are achieved. The funnel shape of the guide hopper 11 forms a converging flow channel from the top opening to the bottom outlet, which can naturally guide and converge the particulate fluid entering the cavity of the second pressure cap 4 from the surrounding through-slots 10 to its bottom center region. Since the inlet of the inlet pipe 15 is defined between the top and bottom of the guide hopper 11, it is located precisely on the main path after the fluid is converged, which significantly increases the probability and efficiency of the fluid and its carried particles entering the inlet pipe 15. This improvement ensures that the ground and crushed particles can be transported to the subsequent filtration and collection stage more quickly and thoroughly, reducing unnecessary residence and deposition of particles inside the second pressure cap 4, thereby improving the cleaning efficiency and reliability of the entire system.

[0067] like Figure 5 , Figure 7 and Figure 10 As shown, preferably, the filter assembly 12 includes an inner mesh frame 1201 and an outer mesh frame 1202. The inner mesh frame 1201 and the outer mesh frame 1202 are fixedly connected by a connecting rod 1203. The inner sidewall of the inner mesh frame 1201 is provided with threads, and the lower part of the guide bucket 11 is also provided with threads. The inner mesh frame 1201 and the threaded part of the guide bucket 11 are connected by threaded engagement. A filter screen 1204 is provided between the inner mesh frame 1201 and the outer mesh frame 1202.

[0068] In this embodiment, the filter assembly 12 is specifically defined as a mesh frame structure comprising a threaded inner mesh frame 1201, an outer mesh frame 1202, a connecting rod 1203, and a filter screen 1204, and is connected to the guide bucket 11 by threads, achieving a balance between high filtration efficiency and ease of maintenance. The effect is that this structure can effectively intercept solid particles through the filter screen 1204 before the fluid enters the inlet pipe 15, protecting downstream precision components; simultaneously, the threaded connection makes the entire filter assembly 12 an independent, detachable functional module. When the filter screen 1204 becomes clogged or needs cleaning, there is no need to disassemble the valve body or use complex tools; maintenance or replacement can be performed simply by unscrewing the entire mesh frame, simplifying the maintenance process, reducing long-term maintenance costs, and ensuring the reliability of continuous system operation.

[0069] Example 3

[0070] like Figure 7 and Figure 10 As shown, based on Embodiment 1, the present invention provides a technical solution: preferably, the top of the grinding table 8 has a centrally concave structure; the lower part of the grinding block 7 has a conical structure, and the gap between the grinding table 8 and the grinding block 7 gradually decreases from top to bottom.

[0071] Ordinary planar or simple arc-shaped combinations may have problems with constant or irregular gaps, resulting in low capture efficiency of sand and gravel particles, non-concentrated crushing force, and some particles may only be pushed rather than effectively crushed.

[0072] In this embodiment, by defining the grinding table 8 as a centrally recessed structure and the lower part of the grinding block 7 as a conical structure, and ensuring that the gap between the two gradually decreases from top to bottom, a highly efficient progressive crushing chamber is constructed. This geometric design allows the larger opening at the top to make it easier for mud and sand to enter the crushing working area, avoiding the problem of mud and sand being unable to enter due to too small gaps. Secondly, by setting a gradually changing gap, it is easy to capture particles of different sizes. Subsequently, when the particles move downward with the water flow or gravity into the grinding area, the continuously converging gap between the conical block and the concave surface generates gradually increasing compressive and shear forces on the particles until they are completely crushed. This structure overcomes the problems of particle escape or being subjected to single-point compression that may occur with parallel gaps, greatly improving the crushing efficiency and reliability per unit action, ensuring that the particle size entering the subsequent collection stage is smaller and less prone to clogging or wear.

[0073] like Figure 9 and Figure 11 As shown, preferably, the concave working surface of the grinding table 8 has multiple strip-shaped grinding grooves 26 radiating outward from the center of the concave structure; the conical working surface of the grinding block 7 is a rough surface formed by hardening treatment.

[0074] In this embodiment, by designing the working surface of the grinding table 8 with radially distributed strip-shaped grinding grooves 26 and combining them with the hardened rough surface of the grinding block 7, a highly efficient dynamic grinding pair similar to a stone mill is created. The radially distributed strip-shaped grinding grooves 26 form a clear flow channel from the grinding center area to the periphery. When the ball 5 rotates, the sand and gravel particles trapped in the convergence gap are crushed and scraped by the rough surface above, while being forcibly guided and transported to the periphery by these radial grooves. This design significantly enhances the retention and processing time of particles in the crushing area, ensuring multiple compound crushing effects. At the same time, its natural radial chip removal channel can use centrifugal force and water flow to quickly carry the crushed fine chips away from the core sealing area, effectively preventing secondary accumulation and repeated wear of chips. Thus, while improving crushing efficiency, it greatly improves the system's self-cleaning ability and working continuity.

[0075] Example 4

[0076] Based on Embodiment 2, the present invention provides a technical solution: preferably, the diameter of the output tube 16 is smaller than that of the input tube 15.

[0077] In the above system, if the reset discharge speed of the piston cylinder 14 is not controlled, it may be completed quickly under the action of the reset spring 18. This rapid discharge will result in a large instantaneous flow rate and high flow velocity, which may cause pressure fluctuations or water hammer phenomena inside the outlet pipe 22. This will not only generate noise and vibration, but may also interfere with the stable operation of the downstream system. At the same time, it is not conducive to the stable settling of fine particles intercepted on the filter screen 1204.

[0078] In this embodiment, by setting the diameter of the output pipe 16 to be smaller than that of the input pipe 15, effective physical flow restriction is achieved on the fluid discharge rate during the reset phase of the piston cylinder 14. When the reset spring 18 pushes the piston plate 19 to discharge the clean water in the cylinder to the outlet pipe 22, the relatively smaller diameter of the output pipe 16 increases the local resistance to fluid flow, thereby controlling the reset speed of the piston plate 19 and achieving slow and stable discharge. This slow reset has several advantages: First, it eliminates the pressure shock and pipe vibration that may be caused by rapid drainage, improving the stability and quietness of the system operation; second, the gentle flow rate ensures that the discharge process will not interfere with downstream pipes or equipment.

[0079] Preferably, the collecting cylinder 9 is a transparent cylinder.

[0080] In this embodiment, by specifically defining the collection cylinder 9 as a transparent cylinder, a direct and reliable status observation window is added to the entire system. Operators or maintenance personnel do not need to use any special tools or disassemble parts. They can intuitively and in real time understand the sedimentation height and accumulation of mud and sand in the collection cylinder 9 by simply visual observation, so as to accurately determine when cleaning and maintenance are needed.

[0081] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A sand-proof and wear-resistant sealing structure for a water inlet ball valve, comprising a valve body (1), a valve seat (2), a ball (5), and a main valve stem (6), wherein an inlet pipe (21) and an outlet pipe (22) are respectively provided on both sides of the valve body (1); characterized in that: The valve body (1) has two mounting slots in the middle, and a first pressure cap (3) and a second pressure cap (4) are respectively installed inside the two mounting slots; the main valve stem (6) is rotatably mounted on the first pressure cap (3), and the lower end of the main valve stem (6) is driven to connect with the ball (5) to drive the ball (5) to rotate; a secondary valve stem (13) is rotatably mounted on the second pressure cap (4), and the secondary valve stem (13) is driven to connect with the ball (5); the valve body (1) is close to the second pressure cap (4). A groove is provided on the inner wall of one side, and a grinding table (8) is fixedly connected inside the groove. A grinding block (7) is fixedly connected on the outer wall of the ball (5) away from the main valve stem (6). The grinding block (7) cooperates with the grinding table (8) to crush sand and gravel. The second pressure cover (4) is set as a hollow structure, and the opening is detachably connected to the collection cylinder (9) by a thread. A sealing ring is provided at the part where the second pressure cover (4) is connected to the collection cylinder (9). Several through grooves (10) are provided on the side wall of the second pressure cover (4).

2. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 1, characterized in that: A piston cylinder (14) is fixedly connected to one side of the valve body (1). An exhaust pipe (17) is provided at the top of the piston cylinder (14). A piston plate (19) is slidably connected between the inner walls of the piston cylinder (14). A return spring (18) is fixedly connected between the top of the piston plate (19) and the top of the inner wall of the piston cylinder (14). An input pipe (15) and an output pipe (16) are provided on the piston cylinder (14). The input pipe (15) communicates with the interior of the second pressure cover (4). A one-way valve is provided inside both the input pipe (15) and the output pipe (16). The output pipe (16) is connected to the water outlet pipe (22) of the valve body (1) through a control component. The control component is used to control the connection and disconnection between the output pipe (16) and the water outlet pipe (22). The control component is linked with the main valve stem (6). A filter component (12) is provided at the position where the input pipe (15) is connected inside the second pressure cover (4).

3. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 2, characterized in that: The control component includes an annular groove (20) in the middle of the first pressure cap (3). A valve block (23) is fixedly connected to the outer wall of the main valve stem (6) inside the annular groove (20). The valve block (23) matches the shape of the annular groove (20). A through valve hole (24) is opened on the valve block (23). A through hole connected to the annular groove (20) is opened on both sides of the first pressure cap (3). One of the through holes is connected to the output pipe (16), and the other through hole is connected to the water outlet pipe (22) through the adapter pipe (25).

4. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 3, characterized in that: The second pressure cap (4) has a flow guide (11) fixedly connected inside. The flow guide (11) is funnel-shaped, and the connection between the input pipe (15) and the second pressure cap (4) is located between the top and bottom of the flow guide (11).

5. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 4, characterized in that: The filter assembly (12) includes an inner mesh frame (1201) and an outer mesh frame (1202). The inner mesh frame (1201) and the outer mesh frame (1202) are fixedly connected by a connecting rod (1203). The inner sidewall of the inner mesh frame (1201) is provided with threads. The lower part of the guide bucket (11) is threaded. The inner mesh frame (1201) and the threaded part of the guide bucket (11) are connected by threaded engagement. A filter screen (1204) is provided between the inner mesh frame (1201) and the outer mesh frame (1202).

6. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 1, characterized in that: The top of the grinding table (8) has a centrally concave structure; the lower part of the grinding block (7) has a conical structure, and the gap between the grinding table (8) and the grinding block (7) gradually decreases from top to bottom.

7. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 6, characterized in that: The concave working surface of the grinding table (8) has multiple strip-shaped grinding grooves (26) radiating outward from the center of the concave structure; the conical working surface of the grinding block (7) is a rough surface formed by hardening treatment.

8. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 3, characterized in that: The diameter of the output tube (16) is smaller than that of the input tube (15).

9. The sand-proof and wear-resistant sealing structure for an inlet ball valve according to claim 1, characterized in that: The collection tube (9) is configured as a transparent tube.

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