Corrosion-resistant hard alloy valve core and valve seat for centrifugal machine

Abstract

According to the corrosion-resistant hard alloy valve element and valve seat for the centrifugal machine, a plugging block capable of moving in the radial direction is arranged in a valve element and extends out of a plugging flow channel in advance when the valve element is closed, so that a complete spherical sealing face is formed in the valve element, and in the rotating closing process of the valve element, corrosive media are effectively prevented from entering a valve cavity; compared with the prior art, through the operation of isolating the corrosive medium, the sealing reliability and durability are remarkably improved, a complex stuffing box does not need to be configured for the valve rod, and the maintenance cost is reduced; meanwhile, the indicating cylinder and the indicating ball which are communicated with the valve cavity are arranged, and early warning can be conducted in time when leakage happens to the sealing face; in addition, the modular design of the integral valve body, the detachable valve seat and the valve core is adopted, so that the manufacturing and maintenance difficulty is reduced; a drainage cylinder and a guide ring are additionally arranged in a valve seat flow channel, direct scouring of media to a sealing face can be effectively relieved, and the service life of the valve is further prolonged.

Description

Technical Field

[0001] This invention relates to the field of valves, and in particular to a corrosion-resistant hard alloy valve core and seat for centrifuges. Background Technology

[0002] When centrifuging to filter corrosive slurries containing solid particles, key process points such as feed, slag discharge, and filtrate outlet require sealing valves with excellent corrosion and wear resistance. Hard-seal ball valves are a typical choice to meet this requirement. Their valve core (ball) and seat are made of hard alloy (such as tungsten carbide or Stellite alloy), forming a "metal-to-metal" sealing pair. The valve is mainly composed of a valve body, hard alloy ball, valve seat, valve stem, and drive device. Its core function is to reliably cut off or connect highly corrosive and highly abrasive slurry media, ensure that the centrifugation process is carried out under closed conditions, effectively prevent leakage, withstand particle erosion, and ensure long-term stable operation of the system under harsh working conditions.

[0003] The existing patent with publication number CN118935010B discloses a high-pressure hard-seal ball valve. By adding a material guide shell pretreatment device containing a slidable first sliding shell and annular array rotating baffles upstream of the main valve (composed of a first shell, a second shell, a seal and a plug ball), the high-pressure fluid is throttled and buffered in advance, thereby significantly reducing the liquid pressure and direct impact force entering the ball valve body, and ultimately achieving the purpose of effectively protecting the sealing surface of the plug ball and extending the overall service life of the valve.

[0004] The existing patent with publication number CN116066594B discloses an alloy steel wear-resistant hard-seal ball valve. By setting symmetrically distributed air bladders on the ball valve and connecting them through a connecting pipe, and setting slidable extrusion plates in adjacent arc-shaped plates, the fluid pressure in the valve body impacts the extrusion plates, transferring kinetic energy to the air bladders. This causes the outer ring surface of the air bladders to expand under pressure and fit tightly against the inner wall of the valve body, thereby achieving the effect of dynamically enhancing the sealing contact area. This significantly improves the sealing reliability and service life of the ball valve under high pressure or pressure fluctuation conditions.

[0005] The aforementioned prior art discloses a technical solution for reducing fluid scouring pressure using a pretreatment device with a guide shell, and also discloses a technical solution for improving the sealing performance of the contact sealing surface using a squeezing plate linked to the airbag. However, the prior art still has shortcomings. In the existing ball valve structure, when the valve ball rotates to switch the opening and closing state, the conveying medium will inevitably seep into the valve cavity and come into contact with the valve stem (e.g., Figure 13 As shown in the figure, valves must be equipped with a dynamic sealing structure called a valve stem stuffing box to prevent media leakage. This structure not only increases the overall complexity of the valve, but also requires periodic tightening or replacement due to the easy wear of the stuffing, which significantly increases the maintenance difficulty and long-term operating cost of the valve. Summary of the Invention

[0006] The core of this invention lies in solving the problem in the prior art where the valve stem is easily corroded by the conveying medium entering the valve cavity due to the rotation of the valve ball by a sealing block set inside the valve core. At the same time, the indicator cylinder and indicator ball can detect internal leakage of the valve in a timely manner.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A corrosion-resistant hard alloy valve core and seat for a centrifuge includes a valve body, a valve core disposed within the valve body, a pair of valve seats slidably abutting against both sides of the valve core, both valve seats being installed inside the valve body, and a valve cavity being formed by the pair of valve seats, the valve core, and the valve body; the valve core includes an outer ball cylinder, the lower end of which is rotatably connected to the inner wall of the valve body, a valve stem being snapped onto the upper end of the outer ball cylinder, the valve stem extending to the top of the valve body and slidably fitted with a threaded cap, the threaded cap being threadedly connected to the outer wall of the valve body, and a gripping disc being fixedly connected to the upper end of the valve stem; An inner sphere is located inside an outer spherical cylinder. Both ends of the inner sphere are fixedly connected to the inner wall of the outer spherical cylinder via fixed columns. The inner sphere and the outer spherical cylinder enclose a flow channel cavity for the flow of the conveying medium. A pair of mirror-shaped flow channel holes are opened on the outer spherical cylinder, which communicate with the flow channel cavity. A pair of mirror-shaped sealing blocks are located inside the inner sphere. The sealing blocks are used to seal the flow channel holes. After the sealing blocks are inserted into the flow channel holes, the combination of the outer spherical cylinder and the pair of sealing blocks has a complete spherical outer contour. The sealing blocks are slidably connected to the inner wall of the inner sphere. A connecting rod is hinged to the inner wall of the pair of sealing blocks on opposite sides. The inner ends of the pair of connecting rods are hinged to the same drive rod. An operating rod is engaged at the center of the upper end of the drive rod. The operating rod extends above the valve stem and is fixedly connected to a wrench. A positioning pin moves through the wrench. A positioning hole one and a positioning hole two are opened on the grip plate to cooperate with the positioning pin.

[0009] Furthermore, the outer sphere is a hollow sphere structure, and the inner sphere has a radial hole that penetrates through it. The radial hole is coaxially arranged with the flow channel hole, and a pair of sealing blocks are slidably nested in the radial hole.

[0010] Furthermore, a rotating column is fixedly connected to the lower end of the outer ball cylinder, and a protruding column that is rotatably connected to the rotating column is fixedly connected to the inner wall of the valve body. A columnar cavity for the rotating column to be inserted is opened in the protruding column. A prismatic column is fixedly connected to the upper end of the outer ball cylinder, and a prismatic cavity for the prismatic column to be inserted is opened at the lower end of the valve stem.

[0011] Furthermore, a first sealing ring abutting against the upper end face of the prism-shaped column is provided in the prism cavity. A through hole for the valve stem to pass through movably is formed in the valve body shell wall. A first threaded cylinder fixedly connected to the valve body is communicated with the outside of the through hole. A limiting ring is fixedly connected to the upper part of the valve stem. The limiting ring is slidably connected to the inner wall of the first threaded cylinder. A second sealing ring abutting against the lower end of the limiting ring is provided in the first threaded cylinder. A central hole for the valve stem to pass through movably is formed in the threaded cover. An inner convex ring is provided on the part of the lower end face of the threaded cover outside the central hole. The lower end face of the inner convex ring abuts against the limiting ring.

[0012] Furthermore, the operating rod sequentially passes through the upper part of the inner sphere, the upper fixed column, the prism-shaped column, the first sealing ring and the valve stem from bottom to top. The cross section of the positioning pin is in the shape of a Chinese character 'tu', and its lower end is in a pointed shape. The first positioning hole and the second positioning hole are located within the same circumference and are both on the rotational movement track of the positioning pin.

[0013] Furthermore, the valve seat includes a metal sealing ring abutting against the outer wall of the outer spherical cylinder. A drainage cylinder is fixedly connected to one end of the metal sealing ring away from the outer spherical cylinder. An installation ring is slidably connected to the outside of the drainage cylinder. The installation ring is bolted to a convex ring, and the convex ring is integrally formed with the valve body. A plurality of disc springs are provided between the metal sealing ring and the installation ring. The disc springs are slidably sleeved on the drainage cylinder. A third sealing ring is fixedly connected to the axial side wall of the installation ring on the side away from the disc springs, and the third sealing ring covers the outside of the bolt. A fourth sealing ring is fixedly connected to the circumferential inner wall of the installation ring, and the inner wall of the fourth sealing ring abuts against the outer wall of the drainage cylinder.

[0014] Furthermore, the valve body is in a horizontal cylindrical structure. A guiding ring is fixedly connected to the inner wall of the drainage cylinder. The guiding ring is in the shape of a tapered cylinder with a wide outer part and a narrow inner part, and its narrow inner end faces the flow channel hole.

[0015] Furthermore, an indicating cylinder is threadedly connected to the lower end of the valve body. The indicating cylinder is communicated with the valve cavity. A second threaded cylinder threadedly cooperating with the indicating cylinder is fixedly communicated with the outer wall of the lower end of the valve body. A glass observation window is fixedly connected to the outer wall of the indicating cylinder. A fifth sealing ring is provided at the connection between the indicating cylinder and the second threaded cylinder. An indicating ball is provided in the indicating cylinder.

[0016] Compared with the prior art, the advantages of the present invention are as follows: (1) By providing a pair of plugging blocks that can move radially in the valve core, when the valve is closed, the plugging blocks first extend out to plug the flow port of the flow channel cavity, so that a complete spherical sealing surface is formed on the outer surface of the valve core, thereby completely isolating the corrosive medium in the main sealing area between the valve seat and the valve core and effectively preventing it from entering the valve cavity. This design isolates the transmission components such as the valve stem from the medium. Therefore, there is no need to configure a complex stuffing box sealing structure, which not only significantly improves the durability and sealing reliability of the valve under corrosive conditions, but also simplifies the structure, reduces the manufacturing cost and maintenance requirements.

[0017] (2) The present invention facilitates timely detection of leakage when leakage occurs on the valve seat and valve core sealing surfaces by means of an indicator cylinder connected to the valve cavity and an indicator ball set in the indicator cylinder, thereby improving the timeliness of early warning. At the same time, the valve body with an integral structure and detachable valve seat and valve core reduce the manufacturing difficulty and cost of the valve. In addition, by setting a diversion cylinder and a guide ring, the direct scouring of the conveying medium on the valve seat and valve core sealing surfaces is reduced, thereby improving the service life of the valve. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the valve body in this invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a cross-sectional view of the valve body in this invention; Figure 5 This is an exploded structural diagram of the valve core in this invention; Figure 6 This is a cross-sectional view of the outer spherical tube in this invention; Figure 7 This is a cross-sectional structural diagram of the valve core when it is open in this invention; Figure 8 This is a cross-sectional view of the valve core when the sealing block blocks it in this invention. Figure 9 This is a schematic diagram showing the contact between the sealing block and the metal sealing ring when the valve core rotates in this invention; Figure 10 This is a cross-sectional view of the valve core when it is fully closed in this invention. Figure 11 This is a schematic diagram of the exploded assembly structure of the valve seat in this invention; Figure 12 This is a three-dimensional structural diagram of the indicator cylinder and indicator ball in this invention; Figure 13 This is a cross-sectional view of an existing ball valve.

[0019] Explanation of the labels in the diagram: 1. Valve body; 101. Valve cavity; 102. Raised column; 103. Through hole; 104. Threaded cylinder one; 105. Raised ring; 106. Threaded cylinder two; 2. Valve seat; 3. Valve core; 4. Outer ball cylinder; 401. Flow channel hole; 402. Flow channel cavity; 5. Rotating column; 6. Prismatic column; 7. Valve stem; 701. Prismatic cavity; 702. Limiting ring; 8. Grip plate; 801. Positioning hole one; 802. Positioning hole two; 9. Threaded cap; 901. Inner raised ring; 10. Sealing ring one; 11. Sealing ring II; 12. Inner sphere; 1201. Radial hole; 13. Fixing post; 14. Sealing block; 15. Connecting rod; 16. Drive rod; 17. Operating rod; 18. Wrench; 19. Positioning pin; 20. Metal sealing ring; 21. Drainage tube; 2101. Guide ring; 22. Mounting ring; 23. Disc spring; 24. Bolt; 25. Sealing ring III; 26. Sealing ring IV; 27. Indicator tube; 2701. Glass observation window; 28. Indicator ball; 29. ​​Sealing ring V. Detailed Implementation

[0020] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] First implementation method Please see Figures 1-10 In one embodiment of the present invention, a corrosion-resistant hard alloy valve core and valve seat for a centrifuge includes a valve body 1, a valve core 3 is provided inside the valve body 1, a pair of valve seats 2 are slidably abutted on both sides of the valve core 3, the pair of valve seats 2 are both installed inside the valve body 1, and a valve cavity 101 is formed between the pair of valve seats 2, the valve core 3 and the valve body 1; the valve core 3 includes an outer ball cylinder 4, the lower end of the outer ball cylinder 4 is rotatably connected to the inner wall of the valve body 1, the upper end of the outer ball cylinder 4 is snapped with a valve stem 7, the valve stem 7 extends to the upper part of the valve body 1 and is slidably fitted with a threaded cover 9, the threaded cover 9 is threadedly connected to the outer wall of the valve body 1, and a gripping disc 8 is fixedly connected to the upper end of the valve stem 7; Please see Figure 3 , Figure 5 and Figure 6The outer sphere 4 contains an inner sphere 12, both ends of which are fixedly connected to the inner wall of the outer sphere 4 via fixing posts 13. The inner sphere 12 and the outer sphere 4 enclose a flow channel cavity 402 for the transport medium. The outer sphere 4 has a pair of mirror-image flow channel holes 401 communicating with the flow channel cavity 402. The inner sphere 12 contains a pair of mirror-image sealing blocks 14, which are used to seal the flow channel holes 401. After the sealing blocks 14 are inserted into the flow channel holes 401, the outer sphere 4 and the pair of sealing blocks... The assembly of block 14 has a complete spherical outer contour. The sealing block 14 is slidably connected to the inner wall of the inner sphere 12. A connecting rod 15 is hinged to the inner wall of each pair of sealing blocks 14 on opposite sides. The inner ends of the pair of connecting rods 15 are hinged to the same drive rod 16. An operating rod 17 is engaged at the center of the upper end of the drive rod 16. The operating rod 17 extends above the valve stem 7 and is fixedly connected to a wrench 18. A positioning pin 19 is movably passed through the wrench 18. A positioning hole 801 and a positioning hole 802 that cooperate with the positioning pin 19 are provided on the grip plate 8.

[0022] Please see Figure 7 When the valve is opened, the conveying medium in the upstream pipeline passes through the flow channel of the valve seat 2 on one side and enters the flow channel cavity 402 through the flow channel hole 401. The conveying medium flowing through the flow channel cavity 402 flows out of the valve core 3 through the flow channel hole 401 on the other side. The conveying medium flowing out of the valve core 3 enters the downstream pipeline through the flow channel of the valve seat 2 on the other side.

[0023] When it is necessary to close the centrifuge's outlet valve, the following steps are included: Step 1, sealing the flow channel hole 401: First, pull out the positioning pin 19 upwards so that the positioning pin 19 is disengaged from the positioning hole 801. Then, the operator holds the fixed grip plate 8 with one hand and turns the wrench 18 with the other hand. The wrench 18 drives the drive rod 16 to rotate through the operating rod 17. The drive rod 16 drives a pair of sealing blocks 14 to move in opposite directions through the connecting rod 15 to seal the flow channel hole 401. At this time, the positioning pin 19 moves above the positioning hole 802 and is inserted into the positioning hole 802 under the action of gravity, thus achieving relative fixation of the wrench 18 and the grip plate 8. After the blocking block 14 blocks the flow channel hole 401, the conveying medium cannot enter the valve core 3 (e.g. Figure 8 (as shown) Step 2, rotate valve core 3 (see...) Figure 8 , Figure 9 and Figure 10 Hold the wrench 18 and push it to rotate 90 degrees, and the outer ball cylinder 4 and a pair of sealing blocks 14 will rotate 90 degrees synchronously.

[0024] It should be noted that you should refer to [link / reference]. Figure 9During rotation, the combination of a pair of sealing blocks 14 and the outer ball cylinder 4 has a complete spherical surface. When the flow channel hole 401 blocked by the sealing block 14 slides past the edge of the valve seat 2, the conveying medium is always confined in the cavity between the valve seat 2 and the outer ball cylinder 4 and cannot enter the valve cavity 101. When the corrosive conveying medium discharged from the centrifuge flows through the outlet valve, the corrosive conveying medium will not enter the valve cavity 101, thereby avoiding corrosion of the inner wall of the valve body 1 and the outer wall of the valve stem 7. There is no need to perform complex packing seals on the valve stem 7 (a simple sealing ring seal can be used), thus eliminating the need for periodic inspection and maintenance of the stuffing box.

[0025] Compared to traditional hard-seal ball valves, this invention uses a pair of sealing blocks 14 located within the valve core 3 to seal the flow channel orifice 401 before the valve core 3 is rotated. Simultaneously, after sealing the outer ball cylinder 4, the sealing blocks 14 ensure the valve core 3 has a complete spherical outer contour, blocking the conveying medium between the valve core 3 and the valve seat 2, preventing corrosive conveying media from entering the valve cavity 101. This replaces the open-type spherical flow channel used in traditional ball valves (such as...). Figure 13 As shown, the existing open ball flow channel may cause corrosive conveying media to enter the valve cavity 101 during the closing process. Since the corrosive conveying media does not directly contact the valve stem 7, there is no need to configure a packing seal structure for the valve stem 7, thereby eliminating the need for periodic inspection and maintenance of the sealing packing gland, reducing the structural complexity, manufacturing cost, and maintenance cost of the valve, and improving the durability of the valve. In addition, there is no medium pressure fluctuation or impurity interference in the valve cavity 101, which further improves the sealing performance of the contact sealing surfaces of the valve seat 2 and the valve core 3.

[0026] Please see Figure 3 and Figure 6 The outer sphere 4 is a hollow sphere structure, and the inner sphere 12 has a radial hole 1201 that penetrates through it. The radial hole 1201 is coaxially arranged with the flow channel hole 401, and a pair of sealing blocks 14 are slidably nested in the radial hole 1201.

[0027] Specifically, when the valve is open, a pair of sealing blocks 14 are housed in the radial hole 1201, and when the valve is closed, the pair of sealing blocks 14 extend out of the radial hole 1201 and seal the flow channel hole 401.

[0028] Please see Figure 3 , Figure 4 and Figure 5 The lower end of the outer ball cylinder 4 is fixedly connected to a rotating column 5. The inner wall of the valve body 1 is fixedly connected to a protruding column 102 that is rotatably connected to the rotating column 5. A columnar cavity for the rotating column 5 to be inserted is opened in the protruding column 102. The upper end of the outer ball cylinder 4 is fixedly connected to a prismatic column 6. The lower end of the valve stem 7 is provided with a prismatic cavity 701 for the prismatic column 6 to be inserted.

[0029] Specifically, when the holding disk 8 is screwed, the valve stem 7 drives the rhombic column 6 to rotate, and the rhombic column 6 drives the outer spherical cylinder 4 to rotate.

[0030] Please refer to Figure 3 , Figure 4 and Figure 5 , a first sealing ring 10 that abuts against the upper end surface of the rhombic column 6 is provided in the prism cavity 701. A through hole 103 for the valve stem 7 to pass through movably is provided in the wall of the valve body 1. A first threaded cylinder 104 fixedly connected to the valve body 1 is connected to the outside of the through hole 103. A limiting ring 702 is fixedly connected to the upper part of the valve stem 7. The limiting ring 702 is slidably connected to the inner wall of the first threaded cylinder 104. A second sealing ring 11 that abuts against the lower end of the limiting ring 702 is provided in the first threaded cylinder 104. The threaded cover 9 is provided with a central hole for the valve stem 7 to pass through movably. A part of the lower end surface of the threaded cover 9 outside the central hole is provided with an inner convex ring 901. The lower end surface of the inner convex ring 901 abuts against the limiting ring 702.

[0031] Specifically, by screwing the threaded cover 9, the threaded cover 9 squeezes the limiting ring 702 at the upper end of the valve stem 7. The limiting ring 702 squeezes the second sealing ring 11. At the same time, the valve stem 7 squeezes the first sealing ring 10, causing the first sealing ring 10 and the second sealing ring 11 to expand radially, enhancing the sealing performance at the valve stem 7.

[0032] Please refer to Figure 3 , Figure 4 and Figure 5 , the operating rod 17 passes through the upper part of the inner sphere 12, the upper fixed column 13, the rhombic column 6, the first sealing ring 10 and the valve stem 7 from bottom to top in sequence. The cross section of the positioning pin 19 is in the shape of a Chinese character 'tu' with a pointed lower end. The first positioning hole 801 and the second positioning hole 802 are located on the same circumference and are both on the rotational movement track of the positioning pin 19.

[0033] Specifically, through the cooperation of the positioning pin 19, the first positioning hole 801 and the second positioning hole 802, the locking and detachment of the wrench 18 and the holding disk 8 are realized. It should be noted that the holding disk 8 is a horizontal disk-shaped structure. The first positioning hole 801 and the second positioning hole 802 are both columnar concave holes opened on the upper end surface of the holding disk 8. When the positioning pin 19 is inserted into the second positioning hole 802, the flow channel hole 401 is blocked by the blocking block 14. When the positioning pin 19 is inserted into the first positioning hole 801, the blocking block 14 is disengaged from the flow channel hole 401 and is received in the radial hole 1201.

[0034] The second implementation mode On the basis of the first implementation mode, please refer to Figure 3 , Figure 11 and Figure 12The valve seat 2 includes a metal sealing ring 20 that abuts against the outer wall of the outer ball cylinder 4. A diversion tube 21 is fixedly connected to the end of the metal sealing ring 20 away from the outer ball cylinder 4. An installation ring 22 is slidably connected to the outer side of the diversion tube 21. A raised ring 105 is connected to the installation ring 22 by bolts 24. The raised ring 105 is integrally formed with the valve body 1. A plurality of disc springs 23 are provided between the metal sealing ring 20 and the installation ring 22. The disc springs 23 are slidably sleeved on the diversion tube 21. A sealing ring 3 25 is fixedly connected to the axial side wall of the installation ring 22 away from the disc springs 23. The sealing ring 3 25 covers the outer side of the bolts 24. A sealing ring 4 26 is fixedly connected to the circumferential inner wall of the installation ring 22. The inner wall of the sealing ring 4 26 abuts against the outer wall of the diversion tube 21.

[0035] Specifically, the transport medium in the upstream pipeline enters the flow channel hole 401 of the valve core 3 through the diversion tube 21 and the metal sealing ring 20. The pre-tightening force generated by the disc spring 23 makes the metal sealing ring 20 stick tightly to the outer ball cylinder 4. The installation ring 22 and the raised ring 105 facilitate the quick disassembly and installation of the valve seats 2 on both sides. It should be noted that when the combination of the plugging block 14 and the outer ball cylinder 4 rotates, the transport medium (corrosive slurry containing solid particles) adhering to its spherical outer contour is scraped off by the metal sealing ring 20 and remains in the valve seat 2, and will not enter the valve cavity 101. The metal sealing ring 20, the plugging block 14, the outer ball cylinder 4 and the inner ball 12 are all made of hard alloy material (carbide-based hard alloy), which has good corrosion resistance.

[0036] Please see Figure 3 and Figure 11 The valve body 1 has a horizontal cylindrical structure. A guide ring 2101 is fixedly connected to the inner wall of the flow tube 21. The guide ring 2101 has a tapered cylindrical structure that is wider on the outside and narrower on the inside, with its narrow inner end facing the flow channel hole 401.

[0037] Specifically, by providing a guide ring 2101, the direct scouring of the conveying medium on the contact sealing surface between the metal sealing ring 20 and the outer ball cylinder 4 is reduced, improving the sealing effect and extending the service life of the metal sealing ring 20. In addition, the valve body 1 with a horizontal cylindrical structure is used instead of the traditional split structure valve body, which not only reduces the manufacturing difficulty and cost of the valve, but also overcomes the problem of a large number of interfaces in the split valve body structure, improving the sealing performance. Furthermore, it facilitates the disassembly and assembly of the valve seat 2 and the overall valve.

[0038] Please see Figure 11 and Figure 12The lower end of the valve body 1 is threadedly connected to an indicator cylinder 27, which is connected to the valve cavity 101. The lower outer wall of the valve body 1 is fixedly connected to a threaded cylinder 2 106 that is threadedly engaged with the indicator cylinder 27. A glass observation window 2701 is fixedly connected to the outer wall of the indicator cylinder 27. A sealing ring 29 is provided at the connection between the indicator cylinder 27 and the threaded cylinder 2 106. An indicator ball 28 is provided inside the indicator cylinder 27.

[0039] Specifically, when leakage occurs at the metal sealing surfaces of the metal sealing ring 20 and the outer ball cylinder 4, the conveying medium enters the valve cavity 101. Under the action of gravity, the conveying medium enters the indicator cylinder 27, and the indicator ball 28 floats up under the buoyancy of the conveying medium. This facilitates timely detection of internal leaks by maintenance personnel for maintenance. Compared with the traditional observation method (which can only detect leaks when the conveying medium overflows onto the outer wall of the valve body), this method improves the timeliness of internal leak detection. It should be noted that the diameter of the indicator ball 28 is larger than the diameter of the opening at the upper end of the indicator cylinder 27 to prevent the indicator ball 28 from entering the valve cavity 101 and to ensure the indication effect.

[0040] Compared to traditional hard-seal valves, this invention, through the indicator cylinder 27 communicating with the valve cavity 101 and the indicator ball 28 disposed within the indicator cylinder 27, facilitates timely detection of leaks when leaks occur at the sealing surfaces of the valve seat 2 and valve core 3, improving the timeliness of early warning. At the same time, the integral structure of the valve body 1 and the detachable valve seat 2 and valve core 3 reduce the difficulty and cost of valve manufacturing. Furthermore, by setting the diversion cylinder 21 and guide ring 2101, the direct scouring of the conveying medium on the sealing surfaces of the valve seat 2 and valve core 3 is reduced, thereby improving the service life of the valve.

[0041] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A corrosion-resistant hard alloy valve core and seat for a centrifuge, characterized in that, The valve body (1) includes a valve core (3) inside the valve body (1). A pair of valve seats (2) slide against each other on both sides of the valve core (3). The pair of valve seats (2) are installed inside the valve body (1). A valve cavity (101) is formed between the pair of valve seats (2), the valve core (3) and the valve body (1). The valve core (3) includes an outer ball cylinder (4). The lower end of the outer ball cylinder (4) is rotatably connected to the inner wall of the valve body (1). A valve stem (7) is snapped onto the upper end of the outer ball cylinder (4). The valve stem (7) extends to the top of the valve body (1) and is slidably fitted with a threaded cover (9). The threaded cover (9) is threadedly connected to the outer wall of the valve body (1). A gripping disc (8) is fixedly connected to the upper end of the valve stem (7). The outer sphere (4) contains an inner sphere (12), the upper and lower ends of which are fixedly connected to the inner wall of the outer sphere (4) via fixed posts (13). The inner sphere (12) and the outer sphere (4) enclose a flow channel cavity (402) for the flow of the transport medium. The outer sphere (4) has a pair of mirror-image flow channel holes (401) that communicate with the flow channel cavity (402). The inner sphere (12) contains a pair of mirror-image sealing blocks (14) that are used to seal the flow channel holes (401). After the sealing blocks (14) are inserted into the flow channel holes (401), the outer sphere (4) and the pair of sealing blocks (14) are closed. The assembly of the sealing block (14) has a complete spherical outer contour. The sealing block (14) is slidably connected to the inner wall of the inner sphere (12). A connecting rod (15) is hinged on the inner wall of the opposite side of the pair of sealing blocks (14). The inner ends of the pair of connecting rods (15) are hinged to the same drive rod (16). An operating rod (17) is snapped into the center of the upper end of the drive rod (16). The operating rod (17) extends to the valve stem (7) and is fixedly connected to a wrench (18). A positioning pin (19) is movably passed through the wrench (18). A positioning hole one (801) and a positioning hole two (802) are provided on the grip plate (8) to cooperate with the positioning pin (19).

2. The corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 1, characterized in that, The outer sphere (4) is a hollow sphere structure. The inner sphere (12) has a radial hole (1201) that penetrates itself. The radial hole (1201) is coaxially arranged with the flow channel hole (401). A pair of sealing blocks (14) are slidably nested in the radial hole (1201).

3. A corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 1, characterized in that, The lower end of the outer ball cylinder (4) is fixedly connected to a rotating column (5), and the inner wall of the valve body (1) is fixedly connected to a protruding column (102) that is rotatably connected to the rotating column (5). The protruding column (102) has a columnar cavity for the rotating column (5) to be inserted. The upper end of the outer ball cylinder (4) is fixedly connected to a prismatic column (6), and the lower end of the valve stem (7) has a prismatic cavity (701) for the prismatic column (6) to be inserted.

4. A corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 3, characterized in that, A sealing ring one (10) that abuts against the upper end surface of the rhombic prism (6) is arranged inside the prism cavity (701). A through hole (103) for the valve rod (7) to movably penetrate is formed in the shell wall of the valve body (1). A first threaded cylinder (104) fixedly connected to the valve body (1) is communicated with the outside of the through hole (103). A limiting ring (702) is fixedly connected to the upper part of the valve rod (7). The limiting ring (702) is slidably connected to the inner wall of the first threaded cylinder (104). A sealing ring two (11) that abuts against the lower end of the limiting ring (702) is arranged inside the first threaded cylinder (104). The threaded cover (9) is provided with a central hole for the valve rod (7) to movably penetrate. A inner convex ring (901) is arranged on the part of the lower end surface of the threaded cover (9) outside the central hole. The lower end surface of the inner convex ring (901) abuts against the limiting ring (702).

5. A corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 4, characterized in that, The operating rod (17) sequentially penetrates through the upper part of the inner sphere (12), the upper fixed column (1)3, the rhombic prism (6), the sealing ring one (10) and the valve rod (7) from bottom to top. The cross section of the positioning pin (19) is in the shape of a Chinese character 'tu', and its lower end is in a pointed shape. The first positioning hole (801) and the second positioning hole (802) are located within the same circumference and are both on the rotational movement track of the positioning pin (19).

6. A corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 1, characterized in that, The valve seat (2) includes a metal sealing ring (20) that abuts against the outer wall of the outer spherical cylinder (4). A drainage cylinder (21) is fixedly connected to one end of the metal sealing ring (20) away from the outer spherical cylinder (4). An installation ring (22) is slidably connected to the outside of the drainage cylinder (21). The installation ring (22) is connected to a convex ring (105) through a bolt (24). The convex ring (105) is integrally formed with the valve body (1). A plurality of disc springs (23) are arranged between the metal sealing ring (20) and the installation ring (22). The disc springs (23) are slidably sleeved on the drainage cylinder (21). A sealing ring three (25) is fixedly connected to the axial side wall of the installation ring (22) on the side away from the disc springs (23). The sealing ring three (25) covers the outside of the bolt (24). A sealing ring four (26) is fixedly connected to the circumferential inner wall of the installation ring (22). The inner wall of the sealing ring four (26) abuts against the outer wall of the drainage cylinder (21).

7. A corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 6, characterized in that, The valve body (1) is in a horizontal cylindrical structure. A guiding ring (2101) is fixedly connected to the inner wall of the drainage cylinder (21). The guiding ring (2101) is in a conical cylinder structure with a wide outer part and a narrow inner part, and its inner end narrow opening faces the flow channel hole (401).

8. A corrosion-resistant hard alloy valve core and seat for a centrifuge according to claim 1, characterized in that, The lower end of the valve body (1) is threadedly connected with an indicating cylinder (27). The indicating cylinder (27) is communicated with the valve cavity (101). A second threaded cylinder (106) that is threadedly matched with the indicating cylinder (27) is fixedly communicated with the outer wall of the lower end of the valve body (1). A glass observation window (2701) is fixedly connected to the outer wall of the indicating cylinder (27). A sealing ring five (29) is arranged at the connection between the indicating cylinder (27) and the second threaded cylinder (106). An indicating ball (A:28) is arranged inside the indicating cylinder (27).

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