Large-diameter hard sealing ball valve

Abstract

The invention relates to the technical field of ball valves, in particular to a large-diameter hard sealing ball valve which is characterized in that a valve seat is of an annular structure, a spring piece is arranged in the valve seat, one end of the spring piece is connected with a scraper, and the scraper extends out of the valve seat and abuts against the outer side end face of a ball body to be used for hard sealing of the ball body and scraping of impurity particles on the outer side of the ball body. A plurality of drainage holes are formed in the side, facing the flow channel, of the bottom end of the valve seat, protruding blocks are correspondingly connected to the two sides of the bottom end of the ball, a limiting mechanism is connected to the outer side of the sealing plate, and when the liquid level at the valve seat is higher than a preset value, the limiting mechanism prevents the sealing plate from moving away from the drainage holes, and the liquid level at the valve seat is lower than the preset value. And when the ball rotates to close the flow channel, the telescopic rod piece is pushed through the convex block to drive the sealing plate to move away from the liquid discharging hole, so that liquid and fine impurity particles permeating and accumulated in the valve seat are discharged through the liquid discharging hole, and the sealing protection and dustproof effects on the spring piece are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to a large-caliber hard-sealed ball valve. Background Art

[0002] The large-diameter hard-sealed ball valve is a hard-sealed structural ball valve based on a large-diameter design, which usually includes a valve body, a flow channel is arranged in the valve body, a valve seat is arranged in the valve body, a ball is arranged in the valve seat and is sealed with the ball, a hollow channel is opened in the ball, and cutouts connected to the hollow channel are arranged on both sides of the ball. The top of the ball is connected to a valve stem for driving the axial rotation of the ball. Specifically, a spring element is arranged in the valve seat for elastically connecting a scraper, which extends out of the valve seat and abuts against the periphery of the sealing cutout to achieve hard sealing of the ball and scrape off foreign particles on the outside of the ball. Even if the scraper is worn out due to long-term use, it will be pushed to abut the ball through the spring element. In the prior art, such as Chinese patent document CN107044546B discloses A hard-sealed ball valve, a hard-sealed high-temperature ball valve disclosed in CN104421452A, a hard-sealed ball valve disclosed in CN102537401A, etc. are all designed based on the above-mentioned basic structural principle. However, since the scraper is bound to be exposed, the spring compartment connected thereto is bound to be difficult to completely seal. When used for a long time, the liquid in the ball valve flow channel will inevitably slowly penetrate into the spring compartment. As a result, on the one hand, the spring element is in a liquid environment for a long time, and corrosion and aging are aggravated. On the other hand, the accumulation of fine impurity particles in the liquid can easily lead to obstruction of the expansion and contraction of the spring element, thereby affecting the sealing effect of the scraper. Therefore, sealing protection and dust prevention of the spring element are very important, and still need to be further optimized and improved. Summary of the invention

[0003] In view of this, the purpose of the present invention is to propose a large-diameter hard-sealed ball valve to solve the problem that the sealing protection and dust prevention of the spring element in the existing large-diameter hard-sealed ball valve need to be further optimized and improved.

[0004] Based on the above purpose, the present invention provides a large-caliber hard-sealed ball valve, including a valve body, a flow channel is arranged in the valve body, a valve seat is arranged in the valve body, a ball is arranged in the valve seat and is sealed with the ball, a hollow channel is opened in the ball, and cutouts connected to the hollow channel are arranged on both sides of the ball, and a valve stem is connected to the top of the ball to drive the ball to rotate axially:

[0005] The valve seat is designed as a circular ring structure, with a spring part inside the valve seat, one end of which is connected to a scraper, which extends out of the valve seat and abuts against the outer end surface of the ball, and is used for hard sealing the ball and scraping off foreign particles outside the ball;

[0006] A plurality of drainage holes are provided on the side of the bottom end of the valve seat facing the flow channel, and a telescopic rod is provided inside the bottom end of the valve seat along its axial direction, one end of the telescopic rod away from the flow channel passes through the outside of the valve seat, and the other end of the telescopic rod facing the flow channel passes through the outside of the valve seat and is connected to a sealing plate, and a first elastic member is connected between the other end of the telescopic rod and the inner side wall of the valve seat, which is used to drive the sealing plate to seal tightly against the outside of the drainage hole, and protrusions are correspondingly connected on both sides of the bottom end of the sphere, and a limiting mechanism is connected to the outside of the sealing plate. When the liquid level at the valve seat is higher than a preset value, the sealing plate is blocked from moving away from the drainage hole by the limiting mechanism. When the liquid level at the valve seat is lower than the preset value and the sphere rotates to close the flow channel, the telescopic rod is pushed by the protrusion to drive the sealing plate to move away from the drainage hole.

[0007] Preferably, the side of the bottom end of the valve seat away from the flow channel is designed as a concave structure, and the end of the telescopic rod away from the flow channel passes through the outside of the valve seat and is connected to the first sealing cloth.

[0008] Preferably, the limiting mechanism includes a fixed platform arranged on the bottom end of the inner ring of the valve seat, a groove is provided at the top of the fixed platform, a limiting block is provided in the groove, a second sealing cloth is sealedly connected between the top of the limiting block and the opening of the groove, a connecting rod is connected to the top of the limiting block, one end of the connecting rod is rotatably connected to the outside of the sealing plate, and a second elastic member is provided at the rotating connection, and a limiting step is provided on the side of the groove facing the flow channel. When the liquid level at the valve seat is higher than a preset value, the limiting block is pressurized and abuts against the side end of the limiting step. When the liquid level at the valve seat is lower than the preset value, the second elastic member pushes the connecting rod to rotate, driving the limiting block to rotate to the top of the limiting step, and the telescopic rod is pushed by the protrusion to drive the sealing plate to move away from the drainage hole.

[0009] Preferably, the top end of the limiting block passing through the groove is designed as an outwardly convex arc end surface.

[0010] Preferably, both sides of the fixing platform are designed to be gradually lowered in height from the inside to the outside.

[0011] Preferably, an interconnecting pipeline is connected between the valve seats located on both sides of the ball.

[0012] Preferably, a fixed core is passed through the interconnected pipe, and a movable core is telescopically connected to both ends of the fixed core. A connecting rope is connected between the movable core and the telescopic rod. When the telescopic rod drives the sealing plate to move away from the drainage hole, the movable core is pulled out through the connecting rope.

[0013] Preferably, an intermediate rope is passed through the fixed core, and the two ends of the intermediate rope are respectively connected to the movable cores on both sides. The bottom end of the interconnected pipe is rotatably connected to a turn pin, and the intermediate ropes on both sides are respectively fixedly connected to the side ends of the turn pin. By rotating the turn pin, the intermediate rope is tensioned and wrapped around the turn pin, so as to prevent the sealing plate from moving away from the drainage hole.

[0014] Preferably, a liquid discharge port is provided at the bottom end of the interconnecting pipe. The rotating pin is threadedly engaged at the liquid discharge port. A sealing gasket is provided outside the liquid discharge port. By rotating and tightening the rotating pin, the sealing gasket is pressed against to seal the liquid discharge port.

[0015] Advantages of the present invention: The valve seat is designed with an annular structure. A spring member is provided inside the valve seat. One end of the spring member is connected with a scraper. The scraper extends outside the valve seat and abuts against the outer side end face of the sphere for hard-sealing the sphere and scraping off impurity particles outside the sphere. A plurality of liquid discharge holes are provided on the bottom end surface of the valve seat facing the flow channel. Corresponding convex blocks are connected to both sides of the bottom end of the sphere. A limiting mechanism is connected to the outside of the sealing plate. When the liquid level at the valve seat is higher than the preset value, the limiting mechanism blocks the sealing plate from moving away from the liquid discharge holes. When the liquid level at the valve seat is lower than the preset value and the sphere rotates to a state of closing the flow channel, the convex block pushes the telescopic member to drive the sealing plate to move away from the liquid discharge holes. Thus, the accumulated liquid mass and its fine impurity particles inside the valve seat are discharged through the liquid discharge holes, achieving the sealing protection and dust-proof effect for the spring member. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic diagram of the overall structure of the valve body of the present invention;

[0018] Figure 2 It is a schematic side view structure of the valve seat and the scraper of the present invention;

[0019] Figure 3 It is a schematic front view structure of the scraper of the present invention;

[0020] Figure 4 It is a schematic front view structure of the valve seat of the present invention;

[0021] Figure 5 It is a schematic diagram of the structure of the limiting mechanism when the liquid level at the valve seat of the present invention is higher than the preset value;

[0022] Figure 6 It is a schematic diagram of the structure of the limiting mechanism when the liquid level at the valve seat of the present invention is lower than the preset value;

[0023] Figure 7 It is a schematic diagram of the structure when the sealing plate of the present invention moves away from the liquid discharge holes;

[0024] Figure 8 It is a schematic diagram of the structure when the telescopic member of the present invention elastically contracts by itself;

[0025] Fig. 9 It is a schematic diagram of the overall structure of the interconnected pipelines of the present invention;

[0026] Fig.10 It is a schematic diagram of the internal structure of the interconnected pipelines of the present invention.

[0027] The markings in the figure are:

[0028] 100, valve body; 200, flow channel; 300, valve seat; 301, scraper; 400, sphere; 401, hollow channel; 402, incision; 500, valve stem; 1, drainage hole; 2, telescopic rod; 3, sealing plate; 4, first elastic member; 5, protrusion; 6, limiting mechanism; 61, fixed platform; 62, groove; 63, limiting block; 64, second sealing cloth; 65, connecting rod; 66, limiting step; 7, first sealing cloth; 8, interconnecting pipeline; 81, drainage port; 82, sealing pad; 9, fixed core; 10, movable core; 11, connecting rope; 12, intermediate rope; 13, turn pin. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, a large-caliber hard-sealed ball valve includes a valve body 100, a flow channel 200 is arranged in the valve body 100, a valve seat 300 is arranged in the valve body 100, a ball 400 is arranged in the valve seat 300 and is sealed with the ball 400, a hollow channel 401 is opened in the ball 400, and cutouts 402 connected to the hollow channel 401 are arranged on both sides of the ball 400, a valve stem 500 is connected to the top of the ball 400 for driving the ball 400 to rotate axially, the valve seat 300 is designed as a circular ring structure, a spring member is arranged in the valve seat 300, one end of the spring member is connected to a scraper 301, the scraper 301 extends out of the valve seat 300 and abuts against the outer end surface of the ball 400, and is used for hard sealing the ball 400 and scraping off foreign particles outside the ball 400, and a plurality of rows are opened on the side of the bottom end of the valve seat 300 facing the flow channel 200 Liquid hole 1, a telescopic rod 2 is provided inside the bottom end of the valve seat 300 along its axial direction, one end of the telescopic rod 2 away from the flow channel 200 passes through the outside of the valve seat 300, and the other end of the telescopic rod 2 facing the flow channel 200 passes through the outside of the valve seat 300 and is connected with a sealing plate 3, a first elastic member 4 is connected between the other end of the telescopic rod 2 and the inner side wall of the valve seat 300, which is used to drive the sealing plate 3 to seal tightly against the outer side of the drainage hole 1, and bumps 5 are correspondingly connected on both sides of the bottom end of the sphere 400, and a limiting mechanism 6 is connected to the outer side of the sealing plate 3. When the liquid level at the valve seat 300 is higher than a preset value, the limiting mechanism 6 is used to prevent the sealing plate 3 from moving away from the drainage hole 1. When the liquid level at the valve seat 300 is lower than the preset value and the sphere 400 rotates to close the flow channel 200, the telescopic rod 2 is pushed by the bump 5 to drive the sealing plate 3 to move away from the drainage hole 1.

[0032] The present invention is based on the basic structural principle of the existing large-caliber hard-sealed ball valve, including a valve body 100, a flow channel 200 is arranged in the valve body 100, a valve seat 300 is arranged in the valve body 100, a ball 400 is arranged in the valve seat 300, and the ball 400 is sealed and matched with the ball 400. Figure 1 As shown, a hollow channel 401 is provided in the sphere 400, and cutouts 402 connected to the hollow channel 401 are provided on both sides of the sphere 400, which is equivalent to a sphere being cut on both sides. A valve stem 500 is connected to the top of the sphere 400 to drive the sphere 400 to rotate axially. The sphere 400 rotates to Figure 1 In the state shown, the cutout 402 faces the flow channel 200, and the liquid in the valve body 100 flows through the flow channel 200 and the hollow channel 401. The ball 400 rotates 90 degrees axially, and the cutout 402 is away from the flow channel 200, and the flow channel 200 is blocked by the ball 400. In particular, the valve seat 300 is designed as a circular ring structure, and a spring member is provided in the valve seat 300. One end of the spring member is connected to a scraper 301, and the scraper 301 extends out of the valve seat 300 and abuts against the outer end surface of the ball 400. Specifically, as shown in FIG. Figure 2 , Figure 3As shown, the scraper 301 may be in a circular ring shape coaxially designed along the inner outer ring of the valve seat 300. The scraper 301 partially penetrates into the valve seat 300 and is connected to the valve seat 300 by a spring member. A plurality of spring members may be evenly spaced along the inner circumference of the valve seat 300 to elastically push the scraper 301 outward. Thus, during the rotation and use of the ball 400, the scraper 301 always closely abuts against the periphery of the cutout 402, thereby hard sealing the ball 400 and scraping off foreign particles outside the ball 400.

[0033] But the same problem is that, since the scraper 301 is telescopically connected to the inner side of the valve seat 300, that is, the side close to the ball 400, the ball 400 always maintains a hard seal, but the spring member connected to the scraper 301 is bound to be difficult to be completely sealed, so that after long-term use, the liquid and the impurity particles in the liquid are bound to cause irreversible effects on the spring member. In particular, the valve seat 300 is designed with a hollow annular structure, and the spring member is arranged evenly spaced in the circumferential direction of the valve seat 300, and avoids the bottom end position of the valve seat 300. A plurality of drainage holes 1 are opened on the side of the bottom end of the valve seat 300 facing the flow channel 200, and a telescopic rod 2 is provided inside the bottom end of the valve seat 300 along its axial direction. The end of the telescopic rod 2 away from the flow channel 200 passes through the outside of the valve seat 300. Specifically, the telescopic rod 2 can adopt an existing conventional elastic telescopic rod structure or a multi-section telescopic rod structure, for example Figure 5As shown, the telescopic rod 2 is connected to an elastic component such as a spring at the telescopic joint, and one end of the telescopic rod 2 that passes through the outside of the valve seat 300 is located at the inner circle of the scraper 301, which does not affect the movement of the scraper 301. The other end of the telescopic rod 2 facing the flow channel 200 passes through the outside of the valve seat 300 and is connected to a sealing plate 3. The sealing plate 3 adopts a cardboard structure, and a sealing cushion can be attached to the inner side of the sealing plate 3. A first elastic member 4 is connected between the other end of the telescopic rod 2 and the inner side wall of the valve seat 300. Specifically, a fixing plate can be fixedly connected to the other end of the telescopic rod 2, and a first elastic member 4 is connected between the fixing plate and the inner side wall of the valve seat 300. The first elastic member 4 can adopt existing There are conventional elastic components such as springs, which are used to push the telescopic rod 2 inward, that is, drive the sealing plate 3 to seal tightly against the outside of the drainage hole 1. At the same time, the bottom ends of the sphere 400 are correspondingly connected with bumps 5 on both sides, and the outer side of the sealing plate 3 is connected to a limiting mechanism 6. When the liquid level at the valve seat 300 is lower than the preset value and the sphere 400 rotates to close the flow channel 200, at this time, the bump 5 rotates to the end of the telescopic rod 2 that passes through the outside of the valve seat 300, and the telescopic rod 2 is pushed by the bump 5, driving the sealing plate 3 to move away from the drainage hole 1, so that the liquid and fine impurity particles that have infiltrated and accumulated in the valve seat 300 are discharged along the drainage hole 1. Therefore, although it is impossible to achieve 100% sealing in the valve seat 300, that is, The liquid inevitably penetrates slowly into the valve seat 300, but the ball 400 is used to rotate and close the valve seat 300, so that the accumulated liquid and its fine impurity particles in the valve seat 300 can be discharged to avoid affecting the spring member in the valve seat 300. In another case, when the liquid level at the valve seat 300 is higher than the preset value, the limiting mechanism 6 blocks the sealing plate 3 from moving away from the drainage hole 1, so that even if the ball 400 rotates to close the flow channel 200, the protrusion 5 pushes the telescopic rod 2, and it can only push the telescopic rod 2 to elastically contract, and the sealing plate 3 still maintains the state of sealing the drainage hole 1. Therefore, when the ball 400 rotates to close the flow channel 200, the valve seat 300 on one side may be located at the upstream liquid end. , when the liquid level therein is higher than the preset value, the sealing plate 3 still maintains the state of sealing the drainage hole 1 to prevent a large amount of liquid from entering the valve seat 300. The valve seat 300 on the other side is located at the downstream liquid end. When the liquid therein is drained downward, that is, when the liquid level at the valve seat 300 on this side is lower than the preset value, the drainage hole 1 is triggered to drain the liquid. Therefore, the daily switching action of the valve body 100, or the intentional active switching action, is utilized to realize the sealing protection and dustproof effect of the spring component through the autonomous drainage of the hollow valve seat 300. Even if the liquid level at the valve seat 300 is lower than the preset value, that is, it has not been completely drained in time, the sealing plate 3 is used to push outward to push out the remaining undrained liquid to prevent it from flowing back into the drainage hole 1.

[0034] The head end of the protrusion 5 may be designed as an arc end face or an inclined end face, which is conducive to efficiently pushing the telescopic rod 2 to pass through one end outside the valve seat 300.

[0035] In an embodiment of the present invention, Figure 5 As shown, optionally, the bottom end of the valve seat 300 is designed with a concave structure on the side away from the flow channel 200, and the end of the telescopic rod 2 away from the flow channel 200 passes through the outside of the valve seat 300 and is connected to a first sealing cloth 7. The first sealing cloth 7 is made of a flexible material to maintain the seal of the end of the telescopic rod 2 passing through the outside of the valve seat 300.

[0036] In an embodiment of the present invention, Figure 4 , Figure 5 As shown, the limiting mechanism 6 includes a fixing platform 61 disposed on the bottom end of the inner ring of the valve seat 300. Preferably, as shown in FIG. Figure 5 As shown, the height of both sides of the fixing platform 61 is gradually reduced from the inside to the outside, which is conducive to the flow of liquid. A groove 62 is provided at the top of the fixing platform 61, and a limit block 63 is provided in the groove 62. Preferably, as shown in FIG. Figure 5 As shown, the top of the limit block 63 passing through the groove 62 is designed with an outwardly convex arc-shaped end face, which is conducive to the flow of liquid. A second sealing cloth 64 is sealed between the top of the limit block 63 and the opening of the groove 62. The second sealing cloth 64 is made of a flexible material to maintain the seal in the groove 62. A connecting rod 65 is fixedly connected to the top of the limit block 63. One end of the connecting rod 65 is rotatably connected to the outside of the sealing plate 3, and a second elastic member is provided at the rotatable connection. Specifically, the second elastic member can adopt existing conventional elastic members such as springs, elastic blocks, torsion springs, etc. A limit step 66 is provided on the side of the groove 62 facing the flow channel 200;

[0037] Therefore, when the liquid level at the valve seat 300 is higher than the preset value, Figure 5 As shown, the limit block 63 is compressed and abuts against the side end of the limit step 66, and the top of the limit block 63 passing through the groove 62 is designed to be a convex arc end face. When the liquid flows quickly, it will also press the limit block 63 downward to keep it abutting against the side end of the limit step 66. When the liquid level at the valve seat 300 is lower than the preset value, as shown in FIG. Figure 6 As shown, the second elastic member pushes the connecting rod 65 to rotate, driving the limit block 63 to rotate to the top of the limit step 66. At this time, the telescopic rod 2 is pushed by the protrusion 5, as shown in FIG. Figure 7 As shown, the sealing plate 3 can be driven to move away from the drainage hole 1 and start to actively drain the liquid until the ball 400 rotates to move the protrusion 5 away from the telescopic rod 2, and the sealing plate 3 moves to reset and close the drainage hole 1. If the liquid level at the valve seat 300 is higher than the preset value, even if the protrusion 5 pushes the telescopic rod 2, it can only push the telescopic rod 2 to elastically contract. Figure 8 As shown, the sealing plate 3 still keeps sealing the drain hole 1.

[0038] As another embodiment of the present invention, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, an interconnecting pipe 8 is connected between the valve seats 300 on both sides of the sphere 400, so that the valve seats 300 on both sides are connected, so that when discharging liquid, the valve seats 300 on both sides can be connected to discharge liquid together.

[0039] As another embodiment of the present invention, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, a fixed core 9 is inserted into the interconnection pipe 8, and the two ends of the fixed core 9 are telescopically connected with a movable core 10. The fixed core 9 and the movable core 10 are designed to be an arc shape matching the interconnection pipe 8. A connecting rope 11 is connected between the movable core 10 and the telescopic rod 2, so that when the telescopic rod 2 drives the sealing plate 3 to move away from the drainage hole 1, as shown in FIG. Figure 7 As shown, the movable core 10 is pulled outward by the connecting rope 11, and the pulled out movable core 10 will further occupy the space in the interconnected pipe 8, so that the stored liquid in the interconnected pipe 8 will partially enter the valve seat 300, which is conducive to the discharge of more stored liquid, until the ball 400 rotates to move the protrusion 5 away from the telescopic rod 2, and the sealing plate 3 moves to reset and close the drainage hole 1.

[0040] As another embodiment of the present invention, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, optionally, the fixed core 9 and the movable core 10 can be designed to have a hollow structure, and a through hole can be opened on the movable core 10 to communicate with each other on both sides of the interconnected pipe 8. At the same time, an intermediate rope 12 is passed through the fixed core 9, and the two ends of the intermediate rope 12 are respectively connected to the movable cores 10 on both sides. The bottom end of the interconnected pipe 8 is rotatably connected with a turn pin 13, and the intermediate ropes 12 on both sides are respectively fixedly connected to the side ends of the turn pin 13. The connection structure between the turn pin 13 and the interconnected pipe 8 can adopt an existing structure similar to a rotary joint, which can be rotated arbitrarily while maintaining the sealing of the channel. Therefore, if the autonomous drainage function is not needed, the turn pin 13 can be rotated to tighten the intermediate rope 12 around the turn pin 13, so that the movable core 10 cannot be pulled outward, thereby preventing the sealing plate 3 from moving away from the drainage hole 1.

[0041] As another embodiment of the present invention, Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, optionally, a drain port 81 is provided at the bottom end of the interconnected pipe 8. Although the drain port 81 is not used, it is difficult to use it as a conventional drainage method. In particular, for toxic, harmful, and highly corrosive liquids, it is not suitable to discharge directly through the drain port 81. If an additional liquid storage container is connected to the drain port 81, for long-term use or when the amount of liquid penetration is large, the liquid storage container with a fixed liquid storage volume will still be limited, and the ball valve itself is externally mounted with an overly large liquid storage container, which is also very inconvenient in both preparation and use. Therefore, the drain port 81 is connected by a threaded engagement with the turn pin 13, and a sealing gasket 82 is provided on the outside of the drain port 81. The turn pin 13 is rotated and tightened to press against the sealing gasket 82 to seal the drain port. 81. Compared with the sealed rotary joint, it sacrifices a certain degree of sealing, but the advantage is that the turn pin 13 can be detached and unscrewed, which is more convenient for maintenance. Optionally, the fixed core 9 and the movable core 10 can be elastically connected. During maintenance, the turn pin 13 is unscrewed to discharge the stored liquid, and the turn pin 13 is pulled up and down to make the movable core 10 reciprocate and retract, which is conducive to oscillating and emptying the stored liquid and agglomerated impurities. When the turn pin 13 is reinstalled, if the autonomous drainage function is not needed, the turn pin 13 can be rotated in the same way to make the middle rope 12 tightened and connected to the turn pin 13, so that the movable core 10 cannot be pulled outward, which is used to prevent the sealing plate 3 from moving away from the drainage hole 1. Among them, the middle rope 12 can adopt the existing conventional elastic rope structure.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

Claims

1. A large-caliber hard-sealed ball valve, comprising a valve body (100), wherein a flow channel (200) is arranged in the valve body (100), wherein a valve seat (300) is arranged in the valve body (100), wherein a ball (400) is arranged in the valve seat (300) and is sealed with the ball (400), wherein a hollow channel (401) is provided in the ball (400), wherein two sides of the ball (400) are provided with cutouts (402) connected to the hollow channel (401), wherein a valve stem (500) is connected to the top end of the ball (400) for driving the ball (400) to rotate axially, and wherein the valve stem (500) is characterized in that: The valve seat (300) is designed as a circular ring structure. A spring member is arranged inside the valve seat (300). One end of the spring member is connected to a scraper (301). The scraper (301) extends out of the valve seat (300) and abuts against the outer end surface of the ball (400) to hard-seal the ball (400) and scrape off foreign particles on the outer side of the ball (400). A plurality of drainage holes (1) are provided on a side of the bottom end of the valve seat (300) facing the flow channel (200), a telescopic rod (2) is provided inside the bottom end of the valve seat (300) along its axial direction, one end of the telescopic rod (2) away from the flow channel (200) passes through the outside of the valve seat (300), and the other end of the telescopic rod (2) facing the flow channel (200) passes through the outside of the valve seat (300) and is connected to a sealing plate (3), and a first elastic member (4) is connected between the other end of the telescopic rod (2) and the inner side wall of the valve seat (300) for driving the sealing plate (3) to tighten The spherical body (400) is attached to the outer side of the drainage hole (1) for sealing. Both sides of the bottom end of the spherical body (400) are correspondingly connected with protrusions (5). The outer side of the sealing plate (3) is connected with a limiting mechanism (6). When the liquid level at the valve seat (300) is higher than a preset value, the limiting mechanism (6) blocks the sealing plate (3) from moving away from the drainage hole (1). When the liquid level at the valve seat (300) is lower than the preset value and the spherical body (400) rotates to a state of closing the flow channel (200), the protrusions (5) push the telescopic rod (2) to drive the sealing plate (3) to move away from the drainage hole (1).

2. A large-caliber hard-sealed ball valve according to claim 1, characterized in that: The side of the bottom end of the valve seat (300) away from the flow channel (200) is designed as a concave structure, and the end of the telescopic rod (2) away from the flow channel (200) passes through the outside of the valve seat (300) and is connected to a first sealing cloth (7).

3. A large-caliber hard-sealed ball valve according to claim 1, characterized in that: The limiting mechanism (6) comprises a fixing platform (61) arranged on the bottom end of the inner ring of the valve seat (300), a groove (62) is arranged at the top of the fixing platform (61), a limiting block (63) is arranged in the groove (62), a second sealing cloth (64) is sealed between the top of the limiting block (63) and the opening of the groove (62), a connecting rod (65) is connected to the top of the limiting block (63), one end of the connecting rod (65) is rotatably connected to the outer side of the sealing plate (3), and a second elastic member is arranged at the rotatable connection, the groove A limiting step (66) is provided on the side of the inner portion (62) facing the flow channel (200). When the liquid level at the valve seat (300) is higher than a preset value, the limiting block (63) is compressed and abuts against the side end of the limiting step (66). When the liquid level at the valve seat (300) is lower than the preset value, the second elastic member pushes the connecting rod (65) to rotate, driving the limiting block (63) to rotate to the top of the limiting step (66), and the protrusion (5) pushes the telescopic rod (2), driving the sealing plate (3) to move away from the drainage hole (1).

4. A large-caliber hard-sealed ball valve according to claim 3, characterized in that: The top end of the limit block (63) passing through the groove (62) is designed to be an outwardly convex arc end surface.

5. A large-caliber hard-sealed ball valve according to claim 3, characterized in that: Both sides of the fixing platform (61) are designed to be gradually lowered in height from the inside to the outside.

6. A large-caliber hard-sealed ball valve according to claim 1, characterized in that: An interconnecting pipeline (8) is connected between the valve seats (300) located on both sides of the spherical body (400).

7. A large-caliber hard-sealed ball valve according to claim 6, characterized in that: A fixed core (9) is inserted into the interconnected pipe (8), and movable cores (10) are telescopically connected to both ends of the fixed core (9). A connecting rope (11) is connected between the movable core (10) and the telescopic rod (2). When the telescopic rod (2) drives the sealing plate (3) to move away from the drainage hole (1), the movable core (10) is pulled outwards through the connecting rope (11).

8. A large-diameter hard-sealed ball valve according to claim 7, characterized in that: An intermediate rope (12) is passed through the fixed core (9), and the two ends of the intermediate rope (12) are respectively connected to the movable cores (10) on both sides. The bottom end of the interconnected pipe (8) is rotatably connected to a rotating pin (13), and the intermediate ropes (12) on both sides are respectively fixedly connected to the side ends of the rotating pin (13). By rotating the rotating pin (13), the intermediate rope (12) is tensioned and wound around the rotating pin (13), so as to prevent the sealing plate (3) from moving away from the drainage hole (1).

9. A large-caliber hard-sealed ball valve according to claim 8, characterized in that: A liquid discharge port (81) is provided at the bottom end of the interconnected pipe (8), and the rotating pin (13) is threadedly engaged with the liquid discharge port (81). A sealing gasket (82) is provided on the outside of the liquid discharge port (81), and the liquid discharge port (81) is sealed by rotating and tightening the rotating pin (13) and pressing the sealing gasket (82).

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