A Structure of a Large-diameter Hard-sealed Ball Valve and Its Usage Method

Abstract

The present invention relates to the technical field of ball valves, and particularly relates to a large-diameter hard-sealed ball valve structure and its usage method. An inlet passage is buried inside the top end of the valve body, and an outlet passage is buried inside the bottom end of the valve body. A scraper seat is arranged inside the valve body. A scraper part is arranged at one end of the scraper seat facing the ball. A secondary elastic member is connected between the scraper seat and the valve seat, which is used to push the scraper seat in a direction away from the ball, so that the scraper part is in a state of being separated from the ball. By opening the switching valve and introducing high-pressure fluid into the inlet passage, the high-pressure fluid flows out along the inlet passage, the spring seat, and the outlet passage in sequence, which is used to wash the main elastic member. At the same time, part of the high-pressure fluid is filled into the gap, which is used to push the scraper seat in the direction of the ball, so that the scraper part is in a state of tightly abutting against the outer side of the ball, which is beneficial to scraping the wall-hanging solid impurities on the outer side of the ball that are not in contact with the sealing surface, and avoiding affecting the hard-sealing effect or service life of the ball valve.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and particularly to a large-diameter hard-sealed ball valve structure and its usage method. Background Art

[0002] A large-diameter hard-sealed ball valve is a ball valve with a hard-sealed structure based on a large-diameter design. It generally includes a valve body. A flow channel is provided inside the valve body. A sphere is provided inside the flow channel. A hollow channel is provided inside the sphere. Valve seats are symmetrically provided at both ends of the sphere inside the valve body. Specifically, the top end of the sphere is connected to a valve stem for driving the sphere to axially rotate itself to achieve the on-off control of the ball valve. A spring element is generally provided at the side end of the valve seat so that one end of the valve seat abuts against the sphere to form a hard-sealed sealing surface, which is equivalent to a fixed scraper to achieve hard-sealed contact between the sphere and scraping off impurity particles outside the sphere. Even if the fixed scraper is worn after long-term use, the sphere will be pushed against by the spring element.

[0003] In the prior art, such as a hard-sealed ball valve disclosed in Chinese patent document CN107044546B, etc., basically adopts the above-mentioned conventional structural principle design. However, since the scraper is necessarily exposed, it is very difficult to completely seal the spring element connected thereto. After long-term use, the liquid medium in the flow channel of the ball valve may slowly penetrate into the spring element, exacerbating corrosion and aging. Moreover, the accumulation of fine impurity particles in the liquid medium is likely to cause the spring element to be blocked in its expansion and contraction, thereby affecting the sealing effect of pushing the scraper. In addition, the fixed scraper itself is worn after long-term use, which may also affect its hard-sealed use. And on the outer side surface of the sphere that does not contact the fixed scraper, solid impurities in the liquid medium will inevitably precipitate and adhere after long-term use, which may also affect the hard-sealed use of the fixed scraper. Therefore, further optimization and improvement are still needed. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a large-diameter hard-sealed ball valve structure to solve the problem that the protection ability of the existing large-diameter hard-sealed ball valve for the spring element and the hard seal between the fixed scraper and the sphere is insufficient under long-term use.

[0005] Based on the above purpose, the present invention provides a large-diameter hard-sealed ball valve structure, including a valve body. A flow channel is provided inside the valve body. A sphere is provided inside the flow channel. Cutouts are provided at both ends of the sphere. A hollow channel is provided inside the sphere, and both ends of the hollow channel penetrate towards the cutout. Valve seats are symmetrically provided at both ends of the sphere inside the valve body. One end of the valve seat abuts against the sphere to form a hard-sealed sealing surface:

[0006] A spring seat is provided inside the valve body. The spring seat is located at the end of the valve seat away from the sphere. A main elastic member is provided inside the spring seat for elastically pushing the spring seat towards the sphere so that one end of the valve seat tightly abuts against the sphere;

[0007] An inlet passage is buried inside the top end of the valve body, and an outlet passage is buried inside the bottom end of the valve body. The bottom end of the inlet passage is in communication with the inside of the top end of the spring seat, and the top end of the outlet passage is in communication with the inside of the bottom end of the spring seat;

[0008] A scraper seat is provided inside the valve body. The scraper seat is located at the inner ring of the valve seat and the spring seat. A scraper portion is provided at one end of the scraper seat facing the sphere. There is a gap between the scraper seat and the spring seat. A secondary elastic member is connected between the scraper seat and the valve seat, which is used to push the scraper seat in a direction away from the sphere, so that the scraper portion is in a state of being separated from the sphere. By introducing high-pressure fluid through the inlet passage, the high-pressure fluid flows out along the inlet passage, the spring seat, and the outlet passage in sequence, which is used to wash the main elastic member, and part of the high-pressure fluid is filled into the gap, which is used to push the scraper seat in the direction of the sphere, so that the scraper portion is in a state of tightly abutting against the outer side of the sphere.

[0009] Preferably, stepped grooves are symmetrically provided at both ends of the sphere inside the valve body. The stepped grooves sequentially have a first bottom groove wall, a first side groove wall, a second bottom groove wall, and a second side groove wall in a direction away from the sphere. The valve seat, the spring seat, and the scraper seat are all designed in an annular structure and are clamped in the stepped grooves.

[0010] Preferably, the outer ring of the valve seat abuts against the first bottom groove wall. The cross-section of the spring seat is designed in an L shape. One end of the L-shaped horizontal side of the spring seat abuts against the outside of the valve seat. One end of the L-shaped vertical side of the spring seat faces the first side groove wall and there is a first gap between it and the first side groove wall. The cross-section of the scraper seat is designed in a T shape. The T-shaped vertical side of the scraper seat is vertically connected to the outer ring of its T-shaped horizontal side. The outer end of the T-shaped vertical side of the scraper seat abuts against the L-shaped horizontal side of the spring seat. The inner ring of the T-shaped horizontal side of the scraper seat is flush with the opening of the stepped groove. The outer ring of the T-shaped horizontal side of the scraper seat abuts against the inner ring of the valve seat, the inner ring of the L-shaped vertical side of the spring seat, and the second bottom groove wall respectively. The secondary elastic member is located between the T-shaped vertical side of the scraper seat and the side end of the valve seat. The gap is located between the T-shaped vertical side of the scraper seat and the L-shaped vertical side of the spring seat. There is a second gap between the T-shaped horizontal side of the scraper seat and the second side groove wall.

[0011] Preferably, a first sealing ring is provided between the T-shaped horizontal side of the scraper seat and the inner ring of the valve seat, a second sealing ring is provided between the T-shaped horizontal side of the scraper seat and the second bottom groove wall, and a third sealing ring is provided between the T-shaped vertical side of the scraper seat and the L-shaped horizontal side of the spring seat.

[0012] Preferably, a fourth sealing ring is provided in the second gap, and a slot is provided on the second side groove wall. One end of the fourth sealing ring is connected to the T-shaped horizontal side of the scraper seat, and the other end is inserted into the slot.

[0013] Preferably, an outer tool seat is provided inside the valve body. The outer tool seat is located on the outer ring position of the valve seat and the spring seat. A fifth sealing ring is provided between the outer ring of the outer tool seat and the valve body. An outer scraping knife is connected to the side of the outer tool seat facing the sphere. Side channels are communicated and provided on the sides of the inlet channel and the outlet channel facing the outer tool seat. When high-pressure fluid is introduced into the inlet channel, part of the high-pressure fluid pushes the outer tool seat along the side channels, so that the outer scraping knife abuts against the outer side of the sphere.

[0014] Preferably, the edge of the sealing surface where the valve seat contacts the sphere is designed with an obtuse angle. The edge of the outer ring end of the contact surface between the scraping knife part and the sphere is designed with an acute angle. The edge of the inner ring end of the contact surface between the outer scraping knife and the sphere is designed with an acute angle.

[0015] Preferably, a vertical groove is provided at the bottom end of the sealing surface on the valve seat. The top end of the scraping knife part extends into the vertical groove. When the scraping knife part is in a state of being separated from the sphere, it abuts against the inner side wall of the vertical groove.

[0016] The present invention also provides a usage method of a large-diameter hard-sealed ball valve structure, including the following steps:

[0017] When the ball valve is in normal use, the scraping knife part moves and contracts along with the scraping knife seat and does not contact the sphere to avoid wear. When maintenance is required, open the on-off valves of the inlet channel and the outlet channel, introduce high-pressure fluid into the inlet channel, and the high-pressure fluid flows out along the inlet channel, the spring seat, and the outlet channel in sequence, which is used to wash the main elastic part in the spring seat. At the same time, part of the high-pressure fluid is filled into the gap, which is used to push the scraping knife seat towards the sphere, so that the scraping knife part is in a state of tightly abutting against the outer side of the sphere;

[0018] If it is necessary to improve the hard-sealing performance of the ball valve, open the on-off valve of the inlet channel and keep the on-off valve of the outlet channel closed at the same time. Utilize the high-pressure fluid filled into the inlet channel to keep the scraping knife part in a state of tightly abutting against the outer side of the sphere.

[0019] Advantages of the present invention: Valve seats are symmetrically arranged at both ends of the sphere inside the valve body. One end of the valve seat abuts against the sphere to form a hard-sealed sealing surface. A spring seat is arranged inside the valve body, and the spring seat is located at the end of the valve seat away from the sphere. A main elastic member is arranged inside the spring seat and is used to elastically push the spring seat towards the sphere, so that one end of the valve seat tightly abuts against the sphere. An inlet channel is buried inside the top end of the valve body, and an outlet channel is buried inside the bottom end of the valve body. The bottom end of the inlet channel is communicated with the inside of the top end of the spring seat, and the top end of the outlet channel is communicated with the inside of the bottom end of the spring seat. A scraper seat is arranged inside the valve body, and the scraper seat is located inside the inner circles of the valve seat and the spring seat. A scraper part is arranged at one end of the scraper seat facing the sphere. A gap is left between the scraper seat and the spring seat. A secondary elastic member is connected between the scraper seat and the valve seat and is used to push the scraper seat away from the sphere, so that the scraper part is in a state of being separated from the sphere. By opening the on-off valve and introducing high-pressure fluid into the inlet channel, the high-pressure fluid flows out successively along the inlet channel, the spring seat, and the outlet channel, which is used to wash the main elastic member, carry out the infiltrated liquid, the fine impurity particles in the liquid, the slag falling off due to the aging of the spring element itself, etc. And part of the high-pressure fluid is filled into the gap, and by using the high-pressure effect, it is used to push the scraper seat towards the sphere, so that the scraper part is in a state of tightly abutting against the outer side of the sphere, which is beneficial to scraping the wall-hanging solid impurities on the outer side of the sphere that are not in contact with the sealing surface, avoiding the infiltration of the wall-hanging solid impurities into the sealing surface, causing additional wear to the sphere or the sealing surface, and affecting the hard-sealing effect or service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the valve body of the present invention;

[0022] Figure 2 For the present invention Figure 1 The enlarged schematic diagram at position A;

[0023] Figure 3 For the present invention Figure 1 The enlarged schematic diagram at position B;

[0024] Figure 4 It is a schematic diagram of the structure when high-pressure fluid is filled into the valve body of the present invention;

[0025] Figure 5 For the present invention Figure 4 The enlarged schematic diagram at position C;

[0026] Figure 6 For the present invention Figure 4 Enlarged schematic view at position D in

[0027] Figure 7 Overall structural schematic view of a ball valve with a fourth sealing ring and an extended scraper part in the present invention;

[0028] Figure 8 For the present invention Figure 7 Enlarged schematic view at position E in

[0029] Figure 9 Overall structural schematic view of a ball valve with an outer tool holder, an outer scraper, and a fifth sealing ring in the present invention;

[0030] Figure 10 For the present invention Figure 9 Enlarged schematic view at position F in

[0031] Figure 11 For the present invention Figure 9 Enlarged schematic view at position G in

[0032] Figure 12 Structural schematic view of the inlet channel when the outer tool holder of the present invention extends;

[0033] Figure 13 Structural schematic view of the outlet channel when the outer tool holder of the present invention extends.

[0034] The markings in the figure are:

[0035] 100, valve body; 101, inlet channel; 102, outlet channel; 103, on-off valve; 200, flow channel; 300, sphere; 301, notch; 302, hollow channel; 400, sealing surface; 401, vertical groove; 500, valve stem; 1, valve seat; 2, spring seat; 3, scraper seat; 4, scraper part; 5, gap; 6, secondary elastic member; 7, stepped groove; 71, first bottom groove wall; 72, first side groove wall; 73, second bottom groove wall; 74, second side groove wall; 75, slot; 8, first gap; 9, second gap; 10, first sealing ring; 11, second sealing ring; 12, third sealing ring; 13, fourth sealing ring; 14, outer tool holder; 141, outer scraper; 15, fifth sealing ring; 16, one-way permeable membrane. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0037] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those with ordinary skills in the field to which the present invention pertains. The "first", "second" and similar words used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown in, a large-diameter hard-sealed ball valve structure includes a valve body 100. A flow passage 200 is provided inside the valve body 100. A sphere 300 is provided inside the flow passage 200. Cuts 301 are provided at both ends of the sphere 300. A hollow passage 302 is formed inside the sphere 300. Both ends of the hollow passage 302 penetrate to the cuts 301. Seats 1 are symmetrically provided at both ends of the sphere 300 inside the valve body 100. One end of the seat 1 abuts against the sphere 300 to form a hard-sealed sealing surface 400. A spring seat 2 is provided inside the valve body 100. The spring seat 2 is located at the end of the seat 1 away from the sphere 300. A main elastic member is provided inside the spring seat 2 for elastically pushing the spring seat 2 towards the sphere 300 so that one end of the seat 1 tightly abuts against the sphere 300. An inlet passage 101 is buried inside the top end of the valve body 100. An outlet passage 102 is buried inside the bottom end of the valve body 100. The bottom end of the inlet passage 101 communicates with the inside of the top end of the spring seat 2. The top end of the outlet passage 102 communicates with the inside of the bottom end of the spring seat 2. A scraper seat 3 is provided inside the valve body 100. The scraper seat 3 is located inside the inner circles of the seat 1 and the spring seat 2. A scraper portion 4 is provided at one end of the scraper seat 3 facing the sphere 300. A gap 5 is left between the scraper seat 3 and the spring seat 2. A secondary elastic member 6 is connected between the scraper seat 3 and the seat 1 for pushing the scraper seat 3 in a direction away from the sphere 300 so that the scraper portion 4 is in a state of being separated from the sphere 300. By introducing high-pressure fluid into the inlet passage 101, the high-pressure fluid flows out successively along the inlet passage 101, the spring seat 2, and the outlet passage 102 for flushing the main elastic member, and part of the high-pressure fluid fills into the gap 5 for pushing the scraper seat 3 towards the sphere 300 so that the scraper portion 4 is in a state of tightly abutting against the outer side of the sphere 300.

[0039] The present invention is based on the basic structural principle of existing large-diameter hard-sealed ball valves, such as Figure 1 shown, including a valve body 100. A flow channel 200 is provided inside the valve body 100. A sphere 300 is provided inside the flow channel 200. Cuts 301 are provided at both ends of the sphere 300, which is equivalent to a spherical ball being cut on both sides. A hollow channel 302 is provided inside the sphere 300, and both ends of the hollow channel 302 penetrate through to the cuts 301. Specifically, a valve stem 500 is connected to the top end of the sphere 300 for driving the sphere 300 to rotate axially. For example, when the cuts 301 are facing the flow channel 200, the liquid medium inside the valve body 100 flows through the flow channel 200 and the hollow channel 302. By rotating the sphere 300 axially by 90°, when the cuts 301 are away from the flow channel 200, the flow channel 200 is blocked by the sphere 300, realizing the on-off control of the ball valve;

[0040] As Figure 1 , Figure 2 shown, valve seats 1 are symmetrically provided at both ends of the sphere 300 inside the valve body 100. One end of the valve seat 1 abuts against the sphere 300, forming a hard-sealed sealing surface 400. A spring seat 2 is provided inside the valve body 100, and the spring seat 2 is located at the end of the valve seat 1 away from the sphere 300. A main elastic member is provided inside the spring seat 2. The main elastic member is equivalent to the spring element in existing conventional large-diameter hard-sealed ball valves, and is used to elastically push the spring seat 2 towards the sphere 300, so that one end of the valve seat 1 tightly abuts against the sphere 300. Thus, the sealing surface 400 is equivalent to the fixed scraper of existing conventional hard-sealed ball valves. During the rotation of the sphere 300, the sealing surface 400 always tightly abuts against the outer ring of the cuts 301, realizing the hard sealing of the sphere 300 and the function of scraping off the impurity particles outside the sphere 300;

[0041] Particularly, an inlet channel 101 is buried inside the top end of the valve body 100, and an outlet channel 102 is buried inside the bottom end of the valve body 100. The bottom end of the inlet channel 101 is in communication with the inside of the top end of the spring seat 2, and the top end of the outlet channel 102 is in communication with the inside of the bottom end of the spring seat 2. The top end of the inlet channel 101 and the bottom end of the outlet channel 102 respectively penetrate through the valve body 100 and are connected with a switching valve 103 for controlling the on-off of the channel. A scraper seat 3 is provided inside the valve body 100, and the scraper seat 3 is located inside the inner rings of the valve seat 1 and the spring seat 2. A scraper portion 4 is provided at the end of the scraper seat 3 facing the sphere 300. A gap 5 is left between the scraper seat 3 and the spring seat 2. A secondary elastic member 6 is connected between the scraper seat 3 and the valve seat 1. The secondary elastic member 6 can adopt existing conventional elastic components such as disc springs, and is used to push the scraper seat 3 in the direction away from the sphere 300, such as Figure 1 , Figure 2 , Figure 3As shown, to keep the scraper part 4 separated from the sphere 300. After long-term use, the main elastic member in the spring seat 2 may be affected by the corrosion of the liquid medium flowing through the ball valve, the accumulation of fine impurity particles in the liquid medium, or the aging of the spring element itself, etc., thus affecting the hard sealing effect. By opening the switching valve 103 and introducing high-pressure fluid into the inlet passage 101. Among them, the high-pressure fluid can be clean compressed air, high-pressure pure water, etc. For example, Figure 4 , Figure 5 , Figure 6 As shown, the high-pressure fluid flows out successively along the inlet passage 101, the spring seat 2, and the outlet passage 102, for flushing the main elastic member, taking out the infiltrated liquid medium, the fine impurity particles in the liquid medium, the slag falling off due to the aging of the spring element itself, etc., and part of the high-pressure fluid is filled into the gap 5. Using the high-pressure effect, it is used to push the scraper seat 3 towards the direction of the sphere 300, so that the scraper part 4 is in a state of tightly abutting against the outer side of the sphere 300. The scraper part 4 is equivalent to a movable scraper arranged in the valve body 100 independent of the sealing surface 400 (fixed scraper). During normal use, the scraper part 4 moves and contracts with the scraper seat 3 and does not contact the sphere 300, avoiding wear. After a certain service life, or when it is sensed that the hard sealing ability of the ball valve decreases, or when it is sensed that there is a small amount of infiltration in the spring seat 2, the switching valve 103 can be opened to perform the flushing of the high-pressure fluid. At the same time, the scraper part 4 is driven to move and extend with the scraper seat 3, and the scraper part 4 tightly abuts against the outer side of the sphere 300, which is beneficial to scraping the wall-hanging solid impurities on the outer side of the sphere 300 that are not in contact with the sealing surface 400, avoiding the infiltration of the wall-hanging solid impurities into the sealing surface 400, causing additional wear to the sphere 300 or the sealing surface 400, and affecting the hard sealing effect or service life. Considering that the sealing surface 400 cannot cover the entire outer side of the sphere 300, the conventional fixed scraper basically coincides with the position of the sealing surface 400 in the present invention. Therefore, the scraper part 4 plays a role in removing wall-hanging impurities and a role of standby auxiliary hard sealing. During normal use, the scraper part 4 moves and contracts to avoid wear of the scraper part 4.

[0042] Among them, if the hard sealing performance of the sealing surface 400 decreases, the switching valve 103 of the inlet passage 101 can also be opened, and at the same time, the switching valve 103 of the outlet passage 102 is kept closed. Using the high-pressure fluid filled in, the scraper part 4 is kept in a state of tightly abutting against the outer side of the sphere 300, playing a role of auxiliary hard sealing.

[0043] Among them, considering that in actual use, the probability of a large amount of infiltration occurring in the valve seat 1, the spring seat 2, and the scraper seat 3 is extremely low. Therefore, when there is a small amount of infiltration, the infiltrated liquid medium can be taken away by the flushing of the high-pressure fluid, playing a role in protecting the spring element. After flushing, first close the switching valve 103 of the inlet passage 101, and then close the switching valve 103 of the outlet passage 102 after the outlet passage 102 is emptied.

[0044] In an embodiment of the present invention, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 shown, stepped grooves 7 are symmetrically provided at both ends of the sphere 300 inside the valve body 100. The stepped grooves 7 sequentially have a first bottom groove wall 71, a first side groove wall 72, a second bottom groove wall 73, and a second side groove wall 74 along the direction away from the sphere 300. The valve seat 1, the spring seat 2, and the scraper seat 3 are all designed as an integral annular structure and are clamped in the stepped grooves 7. And the valve seat 1, the spring seat 2, and the scraper seat 3 are movably arranged between them and with the stepped grooves 7.

[0045] Among them, the outer ring of the valve seat 1 abuts against the first bottom groove wall 71. The cross-section of the spring seat 2 is designed in an L shape. One end of the L-shaped horizontal side of the spring seat 2 abuts against the outside of the valve seat 1. One end of the L-shaped vertical side of the spring seat 2 faces the first side groove wall 72 and is open, and there is a first gap 8 between it and the first side groove wall 72. A plurality of main elastic members can be arranged at intervals along the inner circumference of the spring seat 2, and the set positions avoid the position at the bottommost end inside the spring seat 2. One end of the main elastic member is connected to the inner wall of the spring seat 2, and the other end passes through the opening into the first gap 8 and is connected to the first side groove wall 72, so as to elastically push the spring seat 2 in the direction towards the sphere 300. The cross-section of the scraper seat 3 is designed in a T shape. The T-shaped vertical side of the scraper seat 3 is vertically connected to the outer ring of its T-shaped horizontal side. The outer end of the T-shaped vertical side of the scraper seat 3 abuts against the L-shaped horizontal side of the spring seat 2. The inner ring of the T-shaped horizontal side of the scraper seat 3 is flush with the opening of the stepped groove 7. The outer ring of the T-shaped horizontal side of the scraper seat 3 abuts against the inner ring of the valve seat 1, the inner ring of the L-shaped vertical side of the spring seat 2, and the second bottom groove wall 73 respectively. The secondary elastic member 6 is located between the T-shaped vertical side of the scraper seat 3 and the side end of the valve seat 1. The gap 5 is located between the T-shaped vertical side of the scraper seat 3 and the L-shaped vertical side of the spring seat 2. There is a second gap 9 between the T-shaped horizontal side of the scraper seat 3 and the second side groove wall 74, which is used to provide a space for the lateral movement of the scraper seat 3. When high-pressure fluid is filled into the spring seat 2, on the one hand, there is a tendency to push the spring seat 2 in the direction towards the sphere 300. However, since the sealing surface 400 maintains a hard seal state, the valve seat 1 and the spring seat 2 will not shift, but will only further press against the sealing surface 400. On the other hand, the high-pressure fluid fills into the gap 5 along the first gap 8 and the joint between the spring seat 2 and the scraper seat 3. The high-pressure fluid in the gap 5 obtains a sufficient pushing surface to push the scraper seat 3 and the scraper part 4 to move horizontally and extend out, and compress the secondary elastic member 6.

[0046] In an embodiment of the present invention, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 ,Figure 6 As shown, a first sealing ring 10 is provided between the T-shaped horizontal side of the scraper seat 3 and the inner ring of the valve seat 1, a second sealing ring 11 is provided between the T-shaped horizontal side of the scraper seat 3 and the second bottom groove wall 73, and a third sealing ring 12 is provided between the T-shaped vertical side of the scraper seat 3 and the L-shaped horizontal side of the spring seat 2, thereby maintaining the position of the secondary elastic member 6 and the seal inside the spring seat 2.

[0047] As another embodiment of the present invention, as Figure 7 、 Figure 8 shown, a fourth sealing ring 13 is provided in the second gap 9, a slot 75 is opened on the second side groove wall 74, one end of the fourth sealing ring 13 is connected to the T-shaped horizontal side of the scraper seat 3, and the other end is inserted into the slot 75. During normal use, the scraper part 4 moves and contracts with the scraper seat 3, so that the end of the fourth sealing ring 13 tightly abuts against the slot 75, playing a role in further improving the seal. Moreover, using the pressure of the liquid quality in the flow channel 200 to press the fourth sealing ring 13 vertically can also further improve the sealing effect. Preferably, a toothed structure is also provided between the inner wall of the slot 75 and the fourth sealing ring 13. When the scraper seat 3 moves and contracts or extends, the toothed structure meshes, playing a role in further improving the seal.

[0048] As another embodiment of the present invention, as Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 shown, an outer knife seat 14 is provided inside the valve body 100. The outer knife seat 14 is located outside the valve seat 1 and the spring seat 2, and is also designed as an integral annular structure and is clamped inside the valve body 100. A fifth sealing ring 15 is provided between the outer circle of the outer knife seat 14 and the valve body 100. An outer scraper 141 is connected to the side of the outer knife seat 14 facing the sphere 300. Side channels are communicated on the sides of the inlet channel 101 and the outlet channel 102 facing the outer knife seat 14. Thus, when high-pressure liquid quality is introduced into the inlet channel 101, as Figure 12 、 Figure 13 shown, part of the high-pressure liquid quality pushes the outer knife seat 14 along the side channel, so that the outer scraper 141 abuts against the outside of the sphere 300. Thus, the outer scraper 141 and the scraper part 4 cooperate to achieve the effect of a double-acting scraper. The outer scraper 141 is conducive to removing the accumulated dust and impurities at the outer circle of the cut 301. The removed dust and impurities gradually penetrate into the flow channel 200 and flow away during the rotation of the sphere 300, thereby avoiding the accumulated dust and impurities from being mixed into the sealing surface 400. This not only protects the sealing surface 400 from being worn by these particles, but also ensures the stability of the valve opening and closing torque.

[0049] Specifically, when no high-pressure fluid is introduced into the inlet channel 101, the outer tool holder 14 can be pushed to retract by the pressure of the fluid seeping into the outer circle of the incision 301 during the rotation of the sphere 300. Of course, a disc spring can also be connected between the outer tool holder 14 and the inside of the valve body 100 to drive the outer tool holder 14 to retract, so that the outer scraper 141 moves away from the sphere 300.

[0050] In the embodiments of the present invention, as Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 shown, the edge of the sealing surface 400 where the valve seat 1 contacts the sphere 300 is designed with an obtuse angle, the edge of the outer circle end of the contact surface between the scraper part 4 and the sphere 300 is designed with an acute angle, and the edge of the inner circle end of the contact surface between the outer scraper 141 and the sphere 300 is designed with an acute angle, so as to achieve the purpose of efficiently removing the particulate matter attached to the surface of the sphere 300, protecting the sealing surface 400 from being worn by these particulate matters, and ensuring the stability of the valve opening and closing torque.

[0051] Among them, as Figure 12 , Figure 13 shown, a conical graphite ring for multi-surface sealing can be arranged in the trapezoidal area between the valve seat 1 and the spring seat 2. A check valve structure such as a one-way permeable membrane 16 can also be provided on one side surface or in the side channel of the conical graphite ring. After long-term use, if there is a small amount of liquid accumulation seeping into the space of the secondary elastic member 6, the liquid accumulation is stored at the bottom of the annular space of the secondary elastic member 6 and seeps into the outlet channel 102 unidirectionally along the joint, the one-way permeable membrane 16 and the side channel, avoiding cumulative corrosion of the secondary elastic member 6. When the high-pressure fluid is filled into the outlet channel 102 and discharged, the liquid accumulation can be taken away together, and at the same time, the reverse filling of the high-pressure fluid into the annular space of the secondary elastic member 6 is avoided. Refer to Figure 12 , Figure 13 , even without a check valve structure such as the one-way permeable membrane 16, when the high-pressure fluid is quickly discharged along the outlet channel 102, it is very difficult to reverse seep into the secondary elastic member 6.

[0052] In the embodiments of the present invention, as Figure 7 , Figure 8 shown, a vertical groove 401 is provided at the bottom end of the valve seat 1 where the sealing surface 400 is located, and the top end of the scraper part 4 extends into the vertical groove 401. The design of the lengthened scraper part 4, on the one hand, is conducive to more efficiently removing the particulate matter attached to the surface of the sphere 300, and on the other hand, when the scraper part 4 is in a separated state from the sphere 300, it abuts against the inner side wall of the vertical groove 401, which is conducive to further enhancing the sealing effect.

[0053] The present invention also provides a usage method of a large-diameter hard-sealed ball valve structure, including the following steps:

[0054] When the ball valve is in normal use, the scraping part 4 moves and contracts along with the scraping seat 3 and does not contact the sphere 300, so as to avoid abrasion. When maintenance is required, the on-off valves 103 of the inlet channel 101 and the outlet channel 102 are opened, and high-pressure fluid is introduced into the inlet channel 101. The high-pressure fluid flows out successively along the inlet channel 101, the spring seat 2, and the outlet channel 102, and is used to wash the main elastic member in the spring seat 2. At the same time, part of the high-pressure fluid is filled into the gap 5 and is used to push the scraping seat 3 in the direction of the sphere 300, so that the scraping part 4 is in a state of tightly abutting against the outer side of the sphere 300;

[0055] If it is necessary to improve the hard sealing performance of the ball valve, the on-off valve 103 of the inlet channel 101 can be opened, and at the same time, the on-off valve 103 of the outlet channel 102 is kept closed. By using the high-pressure fluid filled into the inlet channel 101, the scraping part 4 is kept in a state of tightly abutting against the outer side of the sphere 300.

[0056] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary 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 can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.

Claims

1. A large-caliber hard-sealed ball valve structure, comprising a valve body (100), wherein a flow channel (200) is provided in the valve body (100), wherein a ball (300) is provided in the flow channel (200), wherein cutouts (301) are provided at both ends of the ball (300), wherein a hollow channel (302) is provided in the ball (300), wherein both ends of the hollow channel (302) are connected to the cutout (301), wherein valve seats (1) are symmetrically provided at both ends of the ball (300) in the valve body (100), wherein one end of the valve seat (1) abuts against the ball (300) to form a hard-sealed sealing surface (400), wherein the valve body (100) comprises: A spring seat (2) is provided in the valve body (100), and the spring seat (2) is located at one end of the valve seat (1) away from the sphere (300). A main elastic member is provided in the spring seat (2) for elastically pushing the spring seat (2) toward the sphere (300) so that one end of the valve seat (1) is tightly abutted against the sphere (300); An inlet channel (101) is buried inside the top end of the valve body (100), and an outlet channel (102) is buried inside the bottom end of the valve body (100); the bottom end of the inlet channel (101) is connected to the top end of the spring seat (2), and the top end of the outlet channel (102) is connected to the bottom end of the spring seat (2); A scraper seat (3) is provided in the valve body (100), and the scraper seat (3) is located at the inner circle of the valve seat (1) and the spring seat (2). A scraper portion (4) is provided at one end of the scraper seat (3) facing the ball (300). A gap (5) is left between the scraper seat (3) and the spring seat (2). A secondary elastic member (6) is connected between the scraper seat (3) and the valve seat (1) for pushing the scraper seat (3) in a direction away from the ball (300) so that the scraper The scraper portion (4) is in a state of being separated from the sphere (300), and a high-pressure fluid is introduced into the inlet channel (101). The high-pressure fluid flows out along the inlet channel (101), the spring seat (2), and the outlet channel (102) in sequence to flush the main elastic member, and part of the high-pressure fluid is filled into the gap (5) to push the scraper seat (3) toward the sphere (300), so that the scraper portion (4) is in a state of being closely abutted against the outer side of the sphere (300); The valve body (100) is symmetrically provided with stepped grooves (7) at both ends of the sphere (300), and the stepped groove (7) has a first bottom groove wall (71), a first side groove wall (72), a second bottom groove wall (73), and a second side groove wall (74) in sequence in a direction away from the sphere (300). The valve seat (1), the spring seat (2), and the scraper seat (3) are all designed as annular structures and are clamped in the stepped groove (7); The outer ring of the valve seat (1) is in abutment against the first bottom groove wall (71); the cross section of the spring seat (2) is designed in an L-shaped shape; one end of the L-shaped horizontal side of the spring seat (2) is in abutment against the outer side of the valve seat (1); one end of the L-shaped vertical side of the spring seat (2) faces the first side groove wall (72) and a first gap (8) is left between the first side groove wall (72); the cross section of the scraper seat (3) is designed in a T-shaped shape; the T-shaped vertical side of the scraper seat (3) is vertically connected to the outer ring of its T-shaped horizontal side; the outer end of the T-shaped vertical side of the scraper seat (3) is in abutment against the outer ring of the spring seat (2); On the L-shaped horizontal edge, the inner circle of the T-shaped horizontal edge of the scraper seat (3) is flush with the opening of the stepped groove (7), and the outer circle of the T-shaped horizontal edge of the scraper seat (3) is respectively abutted against the inner circle of the valve seat (1), the inner circle of the L-shaped vertical edge of the spring seat (2), and the second bottom groove wall (73). The secondary elastic member (6) is located between the T-shaped vertical edge of the scraper seat (3) and the side end of the valve seat (1). The gap (5) is located between the T-shaped vertical edge of the scraper seat (3) and the L-shaped vertical edge of the spring seat (2). A second gap (9) is left between the T-shaped horizontal edge of the scraper seat (3) and the second side groove wall (74).

2. A large-caliber hard-sealed ball valve structure according to claim 1, characterized in that: A first sealing ring (10) is provided between the T-shaped horizontal side of the scraper seat (3) and the inner ring of the valve seat (1), a second sealing ring (11) is provided between the T-shaped horizontal side of the scraper seat (3) and the second bottom groove wall (73), and a third sealing ring (12) is provided between the T-shaped vertical side of the scraper seat (3) and the L-shaped horizontal side of the spring seat (2).

3. A large-caliber hard-sealed ball valve structure according to claim 1, characterized in that: A fourth sealing ring (13) is provided in the second gap (9), a slot (75) is provided on the second side groove wall (74), one end of the fourth sealing ring (13) is connected to the T-shaped horizontal side of the scraper seat (3), and the other end is inserted into the slot (75).

4. A large-caliber hard-sealed ball valve structure according to claim 1, characterized in that: An outer knife seat (14) is provided inside the valve body (100), and the outer knife seat (14) is located at the outer ring position of the valve seat (1) and the spring seat (2). A fifth sealing ring (15) is provided between the outer ring of the outer knife seat (14) and the valve body (100). An outer scraper (141) is connected to the side of the outer knife seat (14) facing the sphere (300). A side channel is provided to connect the side of the inlet channel (101) and the outlet channel (102) facing the outer knife seat (14). When high-pressure fluid is introduced into the inlet channel (101), part of the high-pressure fluid pushes the outer knife seat (14) along the side channel so that the outer scraper (141) abuts against the outer side of the sphere (300).

5. A large-caliber hard-sealed ball valve structure according to claim 4, characterized in that: The edge of the sealing surface (400) where the valve seat (1) contacts the ball (300) is designed to be obtuse-angled, the edge of the outer circle end of the contact surface between the scraper portion (4) and the ball (300) is designed to be acute-angled, and the edge of the inner circle end of the contact surface between the outer scraper (141) and the ball (300) is designed to be acute-angled.

6. A large-caliber hard-sealed ball valve structure according to claim 1, characterized in that: A vertical groove (401) is provided on the valve seat (1) at the bottom end of the sealing surface (400), and the top end of the scraper portion (4) extends into the vertical groove (401). When the scraper portion (4) is in a state of being separated from the ball (300), it abuts against the inner wall of the vertical groove (401).

7. A method of using the large-diameter hard-sealed ball valve structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: When the ball valve is in normal use, the scraper portion (4) moves and shrinks with the scraper seat (3) and does not contact the ball (300) to avoid wear. When maintenance is required, the switch valves (103) of the inlet channel (101) and the outlet channel (102) are opened, and high-pressure fluid is introduced into the inlet channel (101). The high-pressure fluid flows out along the inlet channel (101), the spring seat (2), and the outlet channel (102) in sequence to flush the main elastic member in the spring seat (2). At the same time, part of the high-pressure fluid is filled into the gap (5) to push the scraper seat (3) toward the ball (300), so that the scraper portion (4) is in a state of tightly contacting the outer side of the ball (300); If the hard sealing performance of the ball valve needs to be improved, the switch valve (103) of the inlet channel (101) is opened, while the switch valve (103) of the outlet channel (102) is kept closed, and the scraper portion (4) is kept in close contact with the outer side of the ball (300) by using the high-pressure fluid filled into the inlet channel (101).

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