Sand-proof wear-resistant sealing structure of water inlet ball valve

Abstract

The invention discloses a sand-proof wear-resistant sealing structure of a water inlet ball valve, and relates to the technical field of ball valves, the sand-proof wear-resistant sealing structure comprises a valve body, a valve seat, a ball body and a main valve rod, two sides of the valve body are respectively provided with a water inlet pipe and a water outlet pipe; two mounting grooves are formed in the middle of the valve body, and a first gland and a second gland are mounted in the two mounting grooves correspondingly; the main valve rod rotatably penetrates through the first gland, and the lower end of the main valve rod is in driving connection with the ball body and used for driving the ball body to rotate; an auxiliary valve rod is rotatably arranged on the second gland in a penetrating mode. By arranging the grinding block driven by the ball body and the fixed grinding table, in the opening and closing process of the valve, hard particles such as sand and stone invading a specific area of a valve cavity can be actively ground, the possibility that the particles serve as grinding materials to continuously abrade a main sealing face of the ball body and a valve seat is fundamentally eliminated, and the service life of the valve is prolonged. The conversion from passive defense to active treatment is realized; and a collecting cylinder is arranged for collecting the crushed silt, and continuous abrasion of the silt to the balls is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ball valves, in particular to a sand-proof and wear-resistant sealing structure of a water inlet ball valve. BACKGROUND

[0002] A ball valve is a valve that realizes opening and closing through rotation of a ball, has the advantages of small fluid resistance, reliable sealing and convenient operation, and is widely used in water inlet pipelines in the fields of water conservancy, municipal administration and industry, and the core of the sealing performance is a sealing pair formed by the ball and the valve seat.

[0003] Traditional ball valve sealing structures are mainly divided into two types of soft sealing (such as PTFE and rubber) and hard sealing (such as metal-to-metal), the soft sealing relies on elastic deformation of the material to realize tight fitting, has good initial sealing performance, but poor wear resistance; the hard sealing is more wear-resistant, but still faces the problem of sealing surface being scratched and causing leakage in a medium containing solid particles.

[0004] When the water inlet contains solid particles such as silt, these particles will enter the valve cavity with the medium, and the relative rotation between the ball and the valve seat during the opening and closing and adjustment of the ball valve will entrain the particles and cause continuous abrasive wear of the sealing surface, greatly shortening the service life of the valve, and more importantly, some particles may invade and stay at the sealing interface and be crushed under high pressure, directly scratching the sealing surface and causing sealing failure, the existing technologies mostly start from improving the hardness of the sealing surface material or optimizing the geometry of the sealing pair, but still cannot effectively deal with the particles that have invaded the valve cavity and participated in the wear process, resulting in continuous wear during the rotation of the ball in the use of the ball valve, which is a mere palliative and not a fundamental solution. SUMMARY

[0005] The purpose of the present application is to provide a sand-proof and wear-resistant sealing structure of a water inlet ball valve to solve the problems raised in the background.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows: A sand-proof and wear-resistant sealing structure of a water inlet ball valve, comprising a valve body, a valve seat, a ball and a main valve rod, the two sides of the valve body are respectively provided with a water inlet pipe and a water outlet pipe; a middle part of the valve body is provided with two installation grooves, the inner parts of the two installation grooves are respectively provided with a first gland and a second gland; the main valve rod is rotatably arranged on the first gland, the lower end of the main valve rod is drivingly connected with the ball to drive the ball to rotate; a secondary valve rod is rotatably arranged on the second gland and drivingly connected with the ball; a recess is formed on the inner wall of the side of the valve body close to the second gland, the recess is fixedly connected with a grinding table inside; a grinding block is fixedly connected to the outer wall of the side of the ball away from the main valve rod, the grinding block is used for crushing sand and stone in cooperation with the grinding table; the second gland is provided with a hollow structure, and the opening part is detachably connected with a collecting cylinder through threads, a sealing ring is arranged at the connecting part between the second gland and the collecting cylinder; a plurality of through grooves are formed in the side wall of the second gland.

[0007] By adopting the technical scheme, the hard particles such as sand invading a specific area of the valve cavity can be actively crushed in the valve opening and closing process, the possibility of the particles continuously wearing the ball main sealing surface and the valve seat as abrasive materials is fundamentally eliminated, and the change from passive defense to active treatment is realized.

[0008] Further improvement of the technical scheme of the present application is that one side of the valve body is fixedly connected with a piston cylinder, the top end of the piston cylinder is provided with an exhaust pipe, the inner wall of the piston cylinder is slidably connected with a piston plate, the top of the piston plate is fixedly connected with a return spring between the top of the inner wall of the piston cylinder, the piston cylinder is provided with an input pipe and an output pipe, the input pipe is communicated with the inside of the second gland, the inside of the input pipe and the output pipe are both provided with a check valve, the output pipe is communicated with the water outlet pipe of the valve body through a control assembly, and the control assembly is used for controlling the on-off between the output pipe and the water outlet pipe; the control assembly is linked with the main valve rod; the position of the second gland, where the input pipe is connected, is provided with a filter assembly.

[0009] By adopting the technical scheme, a self-powered particle removal system is constructed by setting the piston cylinder, the return spring, the input pipe and the output pipe with the check valve, and the control assembly linked with the main valve rod; when the ball rotates to the intermediate state, the fluid containing the crushed particles can be automatically pressed into the cavity of the second gland by the water inlet pressure, and the clean water enters the piston cylinder to store energy, and the silt is intercepted to the collecting cylinder; when the valve is completely closed, the linked control assembly automatically changes the passage, so that the piston cylinder stably discharges the temporarily stored clean water under the action of the return spring. This design intelligently binds the cleaning action and the valve operation state, not only greatly improves the initiative and reliability of the removal of particles in the grinding area, but also effectively prevents the silt from entering the downstream pipeline through the pre-filtering and post-discharging mode, and the whole process structure does not need external power.

[0010] Further improvement of the technical scheme of the present application is that the control assembly comprises an annular groove opened in the middle of the first gland, the outer wall of the main valve rod is fixedly connected with a valve block inside the annular groove, the valve block is matched with the shape of the annular groove, a through valve hole is opened in the valve block, and both sides of the first gland are both provided with a through hole communicated with the annular groove, one of the through holes is communicated with the output pipe, and the other through hole is communicated with the water outlet pipe through an adapter pipe.

[0011] The technical scheme has the advantages that the control assembly is specifically defined as a structure comprising a ring-shaped groove, a valve block, a valve hole and a through hole, thereby realizing highly reliable and accurate mechanical synchronization between fluid passage switching and valve spindle operation, the valve block of the control passage is directly fixed on the main valve rod, so that the rotation angle of the valve block is completely consistent with the rotation angle of the ball, when the valve is operated to make the ball completely closed, the valve hole on the valve block is rotated to the position of aligning the two through holes, thereby automatically establishing the discharge passage, and in any other position, the passage is reliably cut off, the mechanical integration design eliminates the need for independent sensors or actuators, the structure is compact and the action is accurate, thereby fundamentally ensuring that the working sequence of the system in the above scheme is absolutely accurate and does not need electric control, thereby improving the practicability of the device.

[0012] The further improvement of the technical scheme of the application is that the inner part of the second gland is fixedly connected with a flow guide hopper, the flow guide hopper is funnel-shaped, and the connection part of the input pipe with the second gland is between the top and bottom of the flow guide hopper.

[0013] The above technical scheme realizes efficient gathering and guiding of the inflowing fluid by setting a funnel-shaped flow guide hopper in the second gland and limiting the connection position of the input pipe, the funnel shape of the flow guide hopper forms a converging flow channel from the top opening to the bottom outlet, and can naturally guide and gather the particle-containing fluid entering the cavity of the second gland from the surrounding grooves to the center area at the bottom. Since the inlet of the input pipe is limited to be arranged between the top and bottom of the flow guide hopper and is located on the main path of the gathered fluid, the probability and efficiency of the fluid and the carried particles entering the input pipe are significantly increased. This improvement ensures that the ground particles can be transported to the subsequent filtering and collecting link more quickly and completely, reduces unnecessary residence and deposition of the particles in the second gland, and improves the cleaning efficiency and reliability of the whole system.

[0014] The further improvement of the technical scheme of the application is that the filtering assembly comprises an inner net frame and an outer net frame, the inner net frame and the outer net frame are fixedly connected through a connecting rod, a thread is arranged on the inner side wall of the inner net frame, the lower part of the flow guide hopper is provided with a thread, the inner net frame and the threaded part of the flow guide hopper are connected through thread cooperation, and a filter screen is arranged between the inner net frame and the outer net frame.

[0015] The technical scheme has the effects that the filter assembly is defined as a net rack structure comprising a threaded inner net rack, an outer net rack, a connecting rod and a filter screen, and is connected with the flow guide hopper in a threaded mode, so that the efficiency of the filtering function and the convenience of maintenance are unified.

[0016] The further improvement of the technical scheme is that the top of the grinding table is a central concave structure; the lower part of the grinding block is a conical structure, and the gap between the grinding table and the grinding block gradually decreases from top to bottom.

[0017] The technical scheme has the effects that the filter assembly is defined as a net rack structure comprising a threaded inner net rack, an outer net rack, a connecting rod and a filter screen, and is connected with the flow guide hopper in a threaded mode, so that the efficiency of the filtering function and the convenience of maintenance are unified.

[0018] The further improvement of the technical scheme is that the top of the grinding table is a central concave structure; the lower part of the grinding block is a conical structure, and the gap between the grinding table and the grinding block gradually decreases from top to bottom.

[0019] The technical scheme is characterized in that the working surface of the grinding table is designed as a radial strip-shaped grinding groove, and is combined with the hardened rough surface of the grinding block, thereby creating a high-efficiency dynamic grinding pair in the form of a stone mill, the radial strip-shaped grinding grooves form a clear flow channel from the grinding center area to the periphery, when the ball rotates, the sand particles captured in the converging gap are subjected to the rolling and scraping of the upper rough surface, and are forced to be guided and transported to the periphery by the radial grooves, the design significantly enhances the residence and processing time of the particles in the crushing area, and ensures multiple composite crushing effect; at the same time, the natural radial chip removal channel can quickly take away the crushed fine chips from the core sealing area by centrifugal force and water flow, effectively preventing the secondary accumulation and repeated wear of the chips, thereby improving the crushing efficiency and the self-cleaning ability and working continuity of the system.

[0020] The further improvement of the technical scheme of the present application is that the diameter of the output pipe is smaller than that of the input pipe.

[0021] The technical scheme is characterized in that the diameter of the output pipe is smaller than that of the input pipe, thereby effectively physically limiting the fluid discharge speed during the reset stage of the piston cylinder, when the reset spring pushes the piston plate to discharge the clean water in the cylinder to the water outlet pipe, the relatively smaller diameter of the output pipe increases the local resistance of fluid flow, so that the reset movement speed of the piston plate is regulated, thereby achieving slow and stable discharge. The benefits of slow reset are multifaceted: first, it eliminates the pressure impact and pipe vibration that may be caused by rapid drainage, thereby improving the stability and quietness of system operation; second, the slow flow rate ensures that the discharge process does not interfere with downstream pipelines or equipment.

[0022] The further improvement of the technical scheme of the present application is that the collecting cylinder is a transparent cylinder.

[0023] The technical scheme is characterized in that the collecting cylinder is specifically defined as a transparent cylinder, thereby adding a direct and reliable state observation window to the entire system, and enabling the operator or maintenance personnel to intuitively and real-timely understand the deposition height and accumulation of the sediment in the collecting cylinder through visual observation, thereby accurately determining when cleaning and maintenance is needed.

[0024] Due to the adoption of the above technical scheme, the present application has the following technical progress compared with the prior art: 1. The present application provides a sand-proof and wear-resistant sealing structure for a water inlet ball valve, which is characterized in that a grinding block driven by a ball and a fixed grinding table are arranged, thereby actively crushing the hard particles such as sand invading a specific area of the valve cavity during the opening and closing of the valve, fundamentally eliminating the possibility of these particles continuously wearing the main sealing surface of the ball and the valve seat as abrasive, and realizing the transformation from passive defense to active management.

[0025] 2. The application provides a sand-proof and wear-resistant sealing structure of a water inlet ball valve. A set of self-powered particle removal system is constructed by arranging a piston cylinder, a reset spring, an input pipe and an output pipe with a one-way valve, and a control assembly linked with a main valve rod. When the ball rotates to the intermediate state, the fluid containing broken particles can be automatically pressed into the second gland cavity by the water inlet pressure, and the clean water enters the piston cylinder to store energy, while the sand is intercepted to the collecting cylinder through the sand removal filter assembly.

[0026] 3. The application provides a sand-proof and wear-resistant sealing structure of a water inlet ball valve. The control assembly is specifically defined as a structure containing an annular groove, a valve block, a valve hole and a through hole, thereby realizing high reliability and precision mechanical synchronization between fluid passage switching and valve main shaft operation. The valve block of the control passage is directly fixed on the main valve rod, so that the rotation angle of the valve block is completely consistent with the rotation angle of the ball. When the valve operation makes the ball completely closed, the valve hole on the valve block is rotated to the position of aligning the two through holes, thereby automatically establishing the discharge passage. In any other position, the passage is reliably cut off, and the process does not need electric control, thereby improving the practicability of the device.

[0027] 4. The application provides a sand-proof and wear-resistant sealing structure of a water inlet ball valve. The grinding table is limited to a central concave structure, the lower part of the grinding block is limited to a conical structure, and the gap between the two is gradually reduced from top to bottom, thereby constructing a high-efficiency progressive crushing cavity. The geometric design enables the sand to more easily enter the crushing working area through the larger upper opening, thereby avoiding the problem that the sand is difficult to enter due to the small gap.

[0028] 5. The application provides a sand-proof and wear-resistant sealing structure of a water inlet ball valve. The working surface of the grinding table is designed to have a radial strip-shaped grinding groove, which is combined with the hardened rough surface of the grinding block to create a high-efficiency dynamic grinding pair similar to a stone mill. The radial strip-shaped grinding grooves form a clear flow channel from the grinding center area to the periphery. When the ball rotates, the sand and stone particles captured in the converging gap are forced to be guided and transported to the periphery by the radial grooves while being crushed and scraped by the rough surface above. This design significantly enhances the residence and processing time of particles in the crushing area, ensuring multiple composite crushing effects. BRIEF DESCRIPTION OF DRAWINGS

[0029] The application will be further described below in combination with the drawings.

[0030] Figure 1 It is a structural schematic diagram of the ball valve as a whole. Figure 2 It is a front view of the ball valve. Figure 3Fig. 1 is a schematic view of the exploded structure of the main valve rod, ball and second gland of the application; Figure 4 Fig. 2 is a schematic view of the exploded structure of the main valve rod, ball and second gland of the application; Figure 5 Fig. 3 is a schematic view of the structure of the flow guide and filter assembly of the application; Figure 6 Fig. 4 is a schematic view of the structure of the control assembly of the application in two different states; Figure 7 Fig. 5 is a schematic view of the right view of the application; Figure 8 Fig. 6 is a schematic view of the flow direction of the ball of the application in three twisted states; Figure 9 Fig. 7 is a schematic view of the main view of the valve body of the application; Figure 10 Fig. 8 is a schematic view of the structure of the control assembly of the application; Figure 7 Fig. 9 is an enlarged view of A in Fig. 8; Figure 11 Fig. 10 is a schematic view of the structure of the grinding table of the application.

[0031] In the figure: 1, valve body; 2, valve seat; 3, first gland; 4, second gland; 5, ball; 6, main valve rod; 7, grinding block; 8, grinding table; 9, collection cylinder; 10, through slot; 11, flow guide; 12, filter assembly; 1201, inner net frame; 1202, outer net frame; 1203, connecting rod; 1204, filter screen; 13, auxiliary valve rod; 14, piston cylinder; 15, input pipe; 16, output pipe; 17, exhaust pipe; 18, return spring; 19, piston plate; 20, annular groove; 21, water inlet pipe; 22, water outlet pipe; 23, valve block; 24, valve hole; 25, adapter pipe; 26, grinding groove. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to the examples.

[0033] Example 1 As Figures 1-11As shown, the application provides a sand-proof and wear-resistant sealing structure of a water inlet ball valve, which comprises a valve body 1, a valve seat 2, a ball 5 and a main valve rod 6, and the two sides of the valve body 1 are respectively provided with a water inlet pipe 21 and a water outlet pipe 22; the middle part of the valve body 1 is provided with two installation grooves, and the inner parts of the two installation grooves are respectively provided with a first gland 3 and a second gland 4; the main valve rod 6 is rotatably arranged on the first gland 3, and the lower end of the main valve rod 6 is drivingly connected with the ball 5 to drive the ball 5 to rotate; a secondary valve rod 13 is rotatably arranged on the second gland 4, and the secondary valve rod 13 is drivingly connected with the ball 5; a recess is arranged on the inner wall of the side of the valve body 1 close to the second gland 4, and a grinding table 8 is fixedly connected in the recess; a grinding block 7 is fixedly connected to the outer wall of the side of the ball 5 away from the main valve rod 6, and the grinding block 7 and the grinding table 8 are used for crushing sand and stone by cooperation; the second gland 4 is provided with a hollow structure, and a collecting cylinder 9 is detachably connected to the opening of the second gland 4 by threads; a sealing ring is arranged at the connecting part of the second gland 4 and the collecting cylinder 9; and a plurality of through grooves 10 are arranged on the side wall of the second gland 4.

[0034] In the embodiment, the grinding block 7 driven by the ball 5 and the fixed grinding table 8 are arranged, so that the hard particles such as sand and stone invading a specific area of the valve cavity can be actively crushed during the opening and closing of the valve, and the possibility of the particles continuously wearing the main sealing surface of the ball 5 and the valve seat 2 as abrasive materials is fundamentally eliminated, and the change from passive defense to active treatment is realized. Further, the hollow second gland 4 provided with the through grooves 10 and the detachable collecting cylinder 9 are arranged, so that the crushed or separated small particles can enter the collecting cylinder 9 through the through grooves 10 under the action of water flow and be concentrated and stored, and the crushed particles are effectively prevented from re-entering the main flow channel or the sealing area to cause secondary wear or blockage. Further, the ball 5 is supported at both ends by the main valve rod 6 and the secondary valve rod 13, and the operation is more stable; the collecting cylinder 9 is connected by threads and provided with a sealing ring, so that the sealing property of the collecting cavity is ensured, and the regular cleaning of the deposits becomes very convenient, and the maintenance difficulty and cost are reduced.

[0035] The non-contact cooperation is formed between the surfaces of the grinding block 7 and the grinding table 8, the gap between the two gradually decreases from top to bottom, the upper end gap ranges from 1.0mm to 3.0mm, and the lower end gap ranges from 0.2mm to 0.8mm, and the two will not hinder the normal use when the particles are not ground.

[0036] When the driving device (such as a hand wheel or an actuator) drives the main valve rod 6 to rotate, the main valve rod 6 transmits the torque to the ball 5, so that the ball 5 rotates in the valve cavity to open or close the ball valve, and the grinding block 7 fixed on the bottom surface of the ball 5 rotates with the ball 5; when the sand and stone particles in the medium move to the groove area on one side of the valve body 1 with the water flow, the relative motion and gap change between the rotating grinding block 7 and the grinding table 8 fixed in the groove produce the crushing and shearing effect on the particles located therebetween, so that the particles are crushed; the crushed fine particles and other impurities in the valve cavity are driven by the water flow in the valve cavity to enter the cavity through the through groove 10 on the side wall of the second gland 4, and finally settle in the lower collecting cylinder 9 connected by threads. The sealing ring ensures the sealing of the connecting part of the collecting cylinder 9, prevents the medium from leaking, and when cleaning is needed, the collecting cylinder 9 can be rotated down to remove the accumulated sand and mud therein after the valve is closed and the pressure is released.

[0037] Referring to Figure 8 , it is shown that the ball 5 is in three different states, wherein the left side shows the closed state of the ball valve, at this time the solid part of the ball 5 blocks inside the valve body 1, so that the water on the inlet pipe 21 side cannot flow into the outlet pipe 22 side; the middle state shows the schematic diagram of the ball 5 in the intermediate state, at this state, the water entering from the inlet pipe 21 not only passes through the channel on the ball 5 to the outlet pipe 22, but also diffuses into the valve body 1; the right side is the completely open state of the ball valve, at this state, the water flow on the inlet pipe 21 side directly enters the outlet pipe 22 through the ball 5. As can be seen, when the ball 5 rotates to the intermediate state (which is between the completely open and completely closed states), the inlet pipe 21 and the outlet pipe 22 are communicated with the chamber in the valve body 1, and the sand can penetrate into the valve cavity; As Figure 3 and Figure 4 shown, the driving connection is the cooperation of the square rod and the square groove, the square rod can be quickly inserted into the square groove, and the rotation of the square rod can drive the main body with the square groove to rotate, such as rotating the main valve rod 6, which can make the ball 5 rotate with the cooperation of the square rod at the end of the main valve rod 6 and the square groove on the ball 5.

[0038] Example 2 As Figure 7 and Figure 10As shown, on the basis of embodiment 1, the application provides a technical scheme: preferably, one side of the valve body 1 is fixedly connected with a piston cylinder 14, the top end of the piston cylinder 14 is provided with an exhaust pipe 17, the inner wall of the piston cylinder 14 is slidably connected with a piston plate 19, the top of the piston plate 19 is fixedly connected with a return spring 18 between the top of the inner wall of the piston cylinder 14, the piston cylinder 14 is provided with an input pipe 15 and an output pipe 16, the input pipe 15 is communicated with the inside of the second gland 4, the inside of the input pipe 15 and the output pipe 16 is provided with a one-way valve, the output pipe 16 is communicated with the water outlet pipe 22 of the valve body 1 through a control assembly, the control assembly is used for controlling the on-off between the output pipe 16 and the water outlet pipe 22; the control assembly is linked with the main valve rod 6; the position of the second gland 4, where the input pipe 15 is connected, is provided with a filter assembly 12.

[0039] The ground particles mainly rely on the natural flow of the water flow in the valve cavity to enter the collecting cylinder 9 through the through slot 10, and this mode has limited efficiency when the flow rate is low or the particle sedimentation is fast, and some particles may still remain near the grinding area; In the embodiment, by setting the piston cylinder 14, the return spring 18, the input pipe 15 and the output pipe 16 with the one-way valve, and the control assembly linked with the main valve rod 6, a self-powered particle removal system is constructed; when the ball 5 rotates to the intermediate state, the water pressure can be used to press the fluid containing broken particles into the cavity of the second gland 4, and the clean water enters the piston cylinder 14 to store energy, and the silt is intercepted into the collecting cylinder 9; when the valve is completely closed, the linked control assembly automatically changes the passage, so that the piston cylinder 14 stably discharges the temporarily stored clean water under the action of the return spring 18. This design intelligently binds the cleaning action and the valve operation state, not only greatly improves the initiative and reliability of the particle removal in the grinding area, but also effectively prevents the silt from entering the downstream pipeline through the pre-filtering and post-discharging mode, and the whole process does not need external power.

[0040] Secondly, in the above scheme, since the process of pressing water into the piston cylinder 14 occurs when the valve body 1 is just opened, this design can also serve as a breather valve to avoid damage to the system caused by sudden changes in water pressure.

[0041] Specifically, when the main valve rod 6 drives the ball 5 to rotate from the fully open or fully closed position to the intermediate state, the channel on the ball 5 is temporarily connected with the water inlet pipe 21 and the valve cavity, the high-pressure medium enters the valve cavity and flows through the grinding area, carries the broken particles through the through slot 10 of the second gland 4 into the cavity thereof; at this time, the control assembly linked with the main valve rod 6 makes the outlet pipe 16 and the water outlet pipe 22 in a closed state; when the particle-containing fluid flows to the inlet of the input pipe 15, it first passes through the filter assembly 12, in which the sediment particles are intercepted and fall into the collection cylinder 9 below, and the filtered clean water enters the bottom of the piston cylinder 14 through the input pipe 15 (the internal one-way valve allows the medium to flow into the piston cylinder 14) to push the piston plate 19 to compress the return spring 18 to move upward, completing the energy storage. When the main valve rod 6 continues to rotate to make the ball 5 reach the fully closed position, the valve cavity is cut off from the water inlet pipe 21, and the linked control assembly opens the passage between the outlet pipe 16 and the water outlet pipe 22 at this time. At this time, the pressure at the bottom of the piston cylinder 14 is released, the return spring 18 pushes the piston plate 19 to reset downward, and the clean water temporarily stored in the piston cylinder 14 is discharged to the water outlet pipe 22 through the outlet pipe 16 (the internal one-way valve allows the fluid to flow out of the piston cylinder 14), and the system returns to the standby state.

[0042] As shown in Figure 6 , Figure 7 and Figure 9 , preferably, the control assembly comprises an annular groove 20 opened in the middle of the first gland 3, the outer wall of the main valve rod 6 is fixedly connected with a valve block 23 inside the annular groove 20, the valve block 23 is matched with the shape of the annular groove 20, a through valve hole 24 is opened in the valve block 23, and both sides of the first gland 3 are provided with guide holes communicated with the annular groove 20, one of the guide holes is communicated with the outlet pipe 16, and the other guide hole is communicated with the water outlet pipe 22 through an adapter pipe 25.

[0043] In the above scheme, the control assembly needs to be linked with the on-off state of the ball 5, and if it is controlled by electricity, the cost and limitations of implementation are increased; In this embodiment, by specifically defining the control assembly as a structure comprising the annular groove 20, the valve block 23, the valve hole 24 and the guide hole, the mechanical synchronization between the fluid passage switching and the valve main shaft operation is realized, which is highly reliable and accurate. The valve block 23 of the control passage is directly fixed on the main valve rod 6, so that the rotation angle of the valve block 23 is completely consistent with the rotation angle of the ball 5. When the valve is operated to make the ball 5 fully closed, the valve hole 24 on the valve block 23 is just rotated to the position aligned with the two guide holes, thereby automatically establishing the discharge passage. In any other position, the passage is reliably cut off. This mechanical integrated design eliminates the need for independent sensors or actuators, has a compact structure and accurate action, fundamentally ensures the absolute accuracy of the working sequence of the system in the above scheme, and does not need electric control, thereby improving the practicability of the device.

[0044] As Figure 6 shown, when the external driving device drives the main valve rod 6 to rotate, the valve block 23 fixed on the outer wall of the main valve rod 6 rotates synchronously in the annular groove 20, and the valve block 23 divides the annular groove 20 into two independent chambers. When the ball 5 (and the valve block 23 synchronously) is at any angle except the fully closed position, the solid wall surface 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, and the control assembly is in the off state. When the main valve rod 6 rotates to the fully closed position of the ball 5, the valve block 23 also rotates to a certain angle, so that the through valve hole 24 opened on the valve block 23 is completely aligned with the two through holes on both sides of the first pressure cover 3. At this time, the valve hole 24, the annular groove 20 and the two through holes form a continuous fluid passage, which connects the output pipe 16 and the water outlet pipe 22, and the control assembly switches to the on state, allowing the fluid in the piston cylinder 14 to flow out through the passage, and the water finally flows into the water outlet pipe 22 from the adapter pipe 25.

[0045] As Figure 2 , Figure 7 and Figure 10 shown, preferably, the second pressure cover 4 is fixedly connected with a flow guide hopper 11 inside, the flow guide hopper 11 is funnel-shaped, and the connection part of the input pipe 15 with the second pressure cover 4 is between the top and bottom of the flow guide hopper 11.

[0046] The particle-containing fluid entering the internal cavity of the second pressure cover 4 from the grinding area has a divergent flow direction, which is easy to cause the particles to escape everywhere instead of flowing effectively to the inlet of the input pipe 15 and being filtered and collected; In this embodiment, by fixing a funnel-shaped flow guide hopper 11 inside and limiting the connection position of the input pipe 15, efficient gathering and guiding of the inflowing fluid are realized. The funnel shape of the flow guide hopper 11 forms a convergent flow passage from the top opening to the bottom outlet, which can naturally guide and gather the particle-containing fluid entering the cavity of the second pressure cover 4 from the surrounding through grooves 10 to the central area at the bottom. Since the inlet of the input pipe 15 is limited to be arranged between the top and bottom of the flow guide hopper 11, it is located on the main path of the gathered fluid, which significantly increases the probability and efficiency of the fluid and the particles carried thereby entering the input pipe 15. This improvement ensures that the ground and broken particles can be transported to the subsequent filtering and collecting link more quickly and completely, reduces unnecessary residence and deposition of the particles in the second pressure cover 4, and thus improves the cleaning efficiency and reliability of the whole system.

[0047] As Figure 5 , Figure 7 and Figure 10As shown, preferably, the filter assembly 12 comprises an inner frame 1201 and an outer frame 1202, the inner frame 1201 and the outer frame 1202 are fixedly connected through a connecting rod 1203, the inner side wall of the inner frame 1201 is provided with a thread, the lower part of the flow guide hopper 11 is provided with a thread, and the inner frame 1201 and the threaded part of the flow guide hopper 11 are connected through thread cooperation. The inner frame 1201 and the outer frame 1202 are provided with a filter screen 1204.

[0048] In this embodiment, by specifically defining the filter assembly 12 as a frame structure comprising a threaded inner frame 1201, an outer frame 1202, a connecting rod 1203 and a filter screen 1204, and connecting it with the flow guide hopper 11 in a threaded manner, the efficiency of the filtering function and the convenience of maintenance are unified. Its effect lies in that this structure can effectively intercept solid particles through the filter screen 1204 before the fluid enters the input pipe 15, protecting the downstream precision components; at the same time, the threaded connection makes the entire filter assembly 12 become an independent detachable functional module. When the filter screen 1204 is clogged or needs to be cleaned, it is not necessary to disassemble the valve body or use complex tools, but only to rotate the entire frame to maintain or replace it, which simplifies the maintenance process, reduces the long-term maintenance cost, and ensures the reliability of the system's continuous operation.

[0049] Embodiment 3 As shown in Figure 7 and Figure 10 As shown in the embodiment 1, the present application provides a technical solution: preferably, the top of the grinding table 8 is a centrally concave structure; the lower part of the grinding block 7 is a conical structure, and the gap between the grinding table 8 and the grinding block 7 gradually decreases from top to bottom.

[0050] The ordinary plane or simple arc matching may have the problem of constant or irregularly changing gap, resulting in low capture efficiency of sand and stone particles, uncentralized breaking force, and part of the particles may be only pushed and not effectively crushed; In this embodiment, by defining the grinding table 8 as a centrally concave structure and the lower part of the grinding block 7 as a conical structure, and ensuring that the gap between them gradually decreases from top to bottom, an efficient progressive crushing cavity is constructed. The geometric design allows the sediment to more easily enter the crushing work area through the larger opening at the top, avoiding the problem of sediment being difficult to enter due to a too small gap. Secondly, by setting a gradually changing gap, particles of different sizes can be easily captured. Then, when the particles move downward into the grinding area along with the water flow or gravity, the continuously converging gap between the conical block and the concave surface generates gradually increasing extrusion force and shear force on the particles, until they are completely crushed. This structure overcomes the problem of particle escape or single-point extrusion that may occur with parallel gaps, greatly improving the crushing efficiency and reliability per action, and ensuring that the particles entering the subsequent collection link are smaller in size and less likely to cause blockage or wear.

[0051] As Figure 9 and Figure 11 Preferably, as shown in the drawings, the lower concave working surface of the grinding table 8 is provided with a plurality of 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 roughened surface formed by hardening treatment.

[0052] In this embodiment, by designing the working surface of the grinding table 8 with radiating strip-shaped grinding grooves 26 and combining it with the hardened roughened surface of the grinding block 7, a high-efficiency dynamic grinding pair resembling a stone mill is created. The radiating strip-shaped grinding grooves 26 form clear flow channels from the grinding center area to the periphery. When the ball 5 rotates, the sand and stone particles trapped in the converging gap are not only crushed and scraped by the roughened surface above, but are also forced to be guided and transported outward by these radiating grooves. This design significantly enhances the residence and processing time of particles in the crushing area, ensuring multiple composite crushing effects. At the same time, its natural radial chip removal channel can quickly remove the crushed fines from the core sealing area with the help of centrifugal force and water flow, effectively preventing the secondary accumulation and repeated wear of the chips, thereby improving the crushing efficiency and the self-cleaning ability and working persistence of the system.

[0053] Embodiment 4 On the basis of Embodiment 2, the present application provides a technical solution: preferably, the pipe diameter of the output pipe 16 is smaller than that of the input pipe 15.

[0054] 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 can cause large instantaneous flow and high flow rate, which can cause internal pressure fluctuations or water hammer phenomenon in the water outlet pipe 22, not only producing noise and vibration, but also possibly interfering with the stable operation of the downstream system, and being not conducive to the stable sedimentation of small particles intercepted on the filter screen 1204. In this embodiment, by setting the pipe diameter of the output pipe 16 to be smaller than that of the input pipe 15, the fluid discharge speed during the reset stage of the piston cylinder 14 is effectively physically limited. When the piston plate 19 is pushed by the reset spring 18 to discharge the clean water in the cylinder to the water outlet pipe 22, the relatively smaller pipe diameter of the output pipe 16 increases the local resistance of fluid flow, so that the reset movement speed of the piston plate 19 is regulated, thereby achieving slow and smooth discharge. The benefits of this slow reset are multifaceted: first, it eliminates the pressure impact and pipe vibration that can be caused by rapid drainage, improving the stability and quietness of system operation; second, the gentle flow rate ensures that the discharge process does not interfere with downstream pipelines or equipment.

[0055] Preferably, the collection cylinder 9 is provided as a transparent cylinder.

[0056] In the embodiment, by specifically defining the collecting cylinder 9 as a transparent cylinder body, a direct and reliable state observation window is added to the whole system, and an operator or a maintenance personnel can intuitively and real-timely understand the deposition height and accumulation of the silt in the collecting cylinder 9 through visual observation without the aid of any special tool or disassembly of components, so as to accurately determine when cleaning and maintenance is needed.

[0057] The above has made a detailed description of the application in general, but some modifications or improvements can be made on the basis of the application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the application are within the protection scope of the application.

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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