Large-diameter hard sealing ball valve structure and using method thereof

Abstract

The invention relates to the technical field of ball valves, in particular to a large-diameter hard sealing ball valve structure and a using method thereof.The large-diameter hard sealing ball valve structure is characterized in that an inlet channel is embedded in the top end of a valve body, an outlet channel is embedded in the bottom end of the valve body, a scraper seat is arranged in the valve body, a scraper part is arranged at the end, facing a ball, of the scraper seat, and a secondary elastic piece is connected between the scraper seat and a valve seat; the push mechanism is used for pushing the scraper base in the direction away from the ball body so that the scraper part can be in the state of being separated from the ball body, the switch valve is opened, high-pressure fluid is introduced into the inlet channel, the high-pressure fluid flows out sequentially along the inlet channel, the spring base and the outlet channel and is used for washing the main elastic piece, and meanwhile part of the high-pressure fluid is filled into the gap. And the scraper part is used for pushing the scraper seat towards the direction of the ball body, so that the scraper part is in a state of tightly abutting against the outer side of the ball body, wall-hanging solid impurities on the outer side face, not in contact with the sealing face, of the ball body are scraped, and the hard sealing effect or the service life of the ball valve is prevented from being affected.

Description

Technical Field

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

[0002] Large-diameter hard-sealed ball valve is a hard-sealed structure ball valve based on a large-diameter design, which usually includes a valve body, a flow channel is arranged in the valve body, a ball is arranged in the flow channel, a hollow channel is opened in the ball, and valve seats are symmetrically arranged at both ends of the ball in the valve body. Specifically, the top of the ball is connected to a valve stem, which is used to drive the axial rotation of the ball to achieve the on-off control of the ball valve. A spring element is generally arranged on the side end of the valve seat so that one end of the valve seat abuts against the ball to form a hard-sealed sealing surface, which is equivalent to a fixed scraper to achieve hard sealing of the ball and scrape off impurities and particles outside the ball. Even if the fixed scraper is worn out due to long-term use, it will be pushed to abut the ball through the spring element;

[0003] In the prior art, a hard-sealed ball valve, such as that disclosed in Chinese patent document CN107044546B, is basically designed using the above-mentioned conventional structural principle. However, since the scraper is bound to be exposed, it is difficult to achieve complete sealing of the spring element connected thereto. After long-term use, the liquid in the ball valve flow channel may slowly penetrate into the spring element, aggravating corrosion and aging, and the accumulation of fine impurity particles in the liquid may easily lead to obstruction of the expansion and contraction of the spring element, thereby affecting the sealing effect of the push scraper. In addition, the long-term wear of the fixed scraper itself may also affect its hard sealing use, and the solid impurities in the liquid will inevitably precipitate and adhere to the outer surface of the ball that is not in contact with the fixed scraper after long-term use, which may also affect the hard sealing 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 propose a large-diameter hard-sealed ball valve structure to solve the problem that the existing large-diameter hard-sealed ball valve has insufficient protection capability for the hard seal between the spring element and the fixed scraper and the ball after long-term use.

[0005] Based on the above purpose, the present invention provides a large-caliber hard-sealed ball valve structure, including a valve body, a flow channel is provided in the valve body, a sphere is provided in the flow channel, cutouts are provided at both ends of the sphere, a hollow channel is opened in the sphere, both ends of the hollow channel pass through the cutouts, valve seats are symmetrically provided at both ends of the sphere in 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 in the valve body, and the spring seat is located at one end of the valve seat away from the ball. A main elastic member is provided in the spring seat, and is used to elastically push the spring seat toward the ball, so that one end of the valve seat is closely abutted against the ball.

[0007] An inlet channel is buried inside the top end of the valve body, an outlet channel is buried inside the bottom end of the valve body, the bottom end of the inlet channel is connected to the top end of the spring seat, and the top end of the outlet channel is connected to the bottom end of the spring seat;

[0008] A scraper seat is provided in the valve body, and the scraper seat is located at the inner circle of the valve seat and the spring seat. A scraper part is provided at the end of the scraper seat facing the sphere, and 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, which is used to push the scraper seat in a direction away from the sphere so that the scraper part is in a state of being separated from the sphere. High-pressure fluid is introduced into the inlet channel, and the high-pressure fluid flows out along the inlet channel, the spring seat and the outlet channel in sequence to flush the main elastic member, and part of the high-pressure fluid is filled in the gap to push the scraper seat in the direction of the sphere so that the scraper part is in a state of closely abutting the outside of the sphere.

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

[0010] Preferably, the outer ring of the valve seat is abutted 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 is abutted against the outer side of the valve seat, one end of the L-shaped vertical side of the spring seat faces the first side groove wall, and a first gap is left between 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 perpendicularly connected to the outer ring of its T-shaped horizontal side, the outer end of the T-shaped vertical side of the scraper seat is abutted 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 is respectively abutted 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, 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, and a second gap is left 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, a slot is provided on the second side groove wall, one end of the fourth sealing ring is connected to the T-shaped horizontal edge of the scraper seat, and the other end is inserted into the slot.

[0013] Preferably, an external knife seat is provided in the valve body, and the external knife seat is located at the outer ring position of the valve seat and the spring seat. A fifth sealing ring is provided between the outer ring of the external knife seat and the valve body. An external scraper is connected to the side of the external knife seat facing the sphere. A side channel is provided on the side of the inlet channel and the outlet channel facing the external knife seat. When high-pressure fluid is introduced into the inlet channel, part of the high-pressure fluid pushes the external knife seat along the side channel to make the external scraper abut against the outside of the sphere.

[0014] Preferably, the edge of the sealing surface where the valve seat contacts the ball is designed with an obtuse angle, the edge of the outer circle end of the scraper contact surface with the ball is designed with an acute angle, and the edge of the inner circle end of the outer scraper contact surface with the ball 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, and the top end of the scraper portion extends into the vertical groove. When the scraper portion is separated from the sphere, it abuts against the inner wall of the vertical groove.

[0016] The present invention also provides a method for using a large-caliber hard-sealed ball valve structure, comprising the following steps:

[0017] When the ball valve is in normal use, the scraper part shrinks with the scraper seat and does not contact the ball to avoid wear. When maintenance is required, the switch valves of the inlet channel and the outlet channel are opened to introduce high-pressure fluid into the inlet channel. The high-pressure fluid flows out along the inlet channel, the spring seat, and the outlet channel in sequence to flush the main elastic member in the spring seat. At the same time, part of the high-pressure fluid is filled into the gap to push the scraper seat toward the ball, so that the scraper part is in a state of close contact with the outside of the ball.

[0018] If the hard sealing performance of the ball valve needs to be improved, the switch valve of the inlet channel is opened while the switch valve of the outlet channel is kept closed. The high-pressure fluid filled into the inlet channel is used to keep the scraper part in close contact with the outside of the ball.

[0019] The beneficial effects of the present invention are as follows: valve seats are symmetrically arranged at both ends of the spherical body in the valve body, one end of the valve seat abuts against the spherical body to form a hard-sealed sealing surface, a spring seat is arranged in the valve body, the spring seat is located at the end of the valve seat away from the spherical body, a main elastic member is arranged in the spring seat, which is used to elastically push the spring seat in the direction of the spherical body so that one end of the valve seat closely abuts against the spherical body, an inlet channel is buried in the top end of the valve body, an outlet channel is buried in the bottom end of the valve body, the bottom end of the inlet channel is connected with the top end of the spring seat, and the top end of the outlet channel is connected with the bottom end of the spring seat, a scraper seat is arranged in the valve body, the scraper seat is located at the inner circle of the valve seat and the spring seat, a scraper portion is arranged on the end of the scraper seat facing the spherical body, a gap is left between the scraper seat and the spring seat, and a gap is left between the scraper seat and the valve seat A secondary elastic part is connected to push the scraper seat in the direction away from the sphere so that the scraper part is in a state of separation from the sphere. By opening the switch valve and introducing high-pressure fluid into the inlet channel, the high-pressure fluid flows out along the inlet channel, the spring seat, and the outlet channel in sequence to flush the main elastic part, bringing out the infiltrated liquid, fine impurity particles in the liquid, and aging residue of the spring element itself, and part of the high-pressure fluid is filled into the gap. The high pressure is used to push the scraper seat in the direction of the sphere, so that the scraper part is in a state of close contact with the outside of the sphere, which is beneficial to scrape off the wall solid impurities on the outer side of the sphere that are not in contact with the sealing surface, and prevent the wall solid impurities from penetrating 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[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 of point A in the middle;

[0023] Figure 3 For the present invention Figure 1 The enlarged schematic diagram of point B in the middle;

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

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

[0026] Figure 6 For the present invention Figure 4 The enlarged schematic diagram of point D in the middle;

[0027] Figure 7 It is a schematic diagram of the overall structure of the ball valve with a fourth sealing ring and an extended scraper portion in the present invention;

[0028] Figure 8 For the present invention Figure 7 The enlarged schematic diagram of point E in the middle;

[0029] Fig. 9 It is a schematic diagram of the overall structure of the ball valve with an external knife seat, an external scraper and a fifth sealing ring in the present invention;

[0030] Fig.10 For the present invention Fig. 9 The enlarged schematic diagram of F in the middle;

[0031] Fig.11 For the present invention Fig. 9 The enlarged schematic diagram of G in the middle;

[0032] Fig.12 It is a structural schematic diagram of the passage when the outer knife holder of the present invention is extended;

[0033] Fig.13 It is a schematic structural diagram of the outlet channel when the outer tool holder of the present invention is extended.

[0034] The markings in the figure are:

[0035] 100, valve body; 101, inlet channel; 102, outlet channel; 103, switch valve; 200, flow channel; 300, sphere; 301, incision; 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 knife seat; 141, outer scraper; 15, fifth sealing ring; 16, unidirectional permeation membrane. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a large-caliber hard-sealed ball valve structure includes a valve body 100, a flow channel 200 is provided in the valve body 100, a ball 300 is provided in the flow channel 200, cutouts 301 are provided at both ends of the ball 300, a hollow channel 302 is opened in the ball 300, both ends of the hollow channel 302 pass through the cutout 301, valve seats 1 are symmetrically provided at both ends of the ball 300 in the valve body 100, one end of the valve seat 1 abuts on the ball 300 to form a hard-sealed sealing surface 400, a spring seat 2 is provided in the valve body 100, the spring seat 2 is located at the end of the valve seat 1 away from the ball 300, a main elastic member is provided in the spring seat 2 for elastically pushing the spring seat 2 toward the direction of the ball 300 so that one end of the valve seat 1 is closely abutted against the ball 300, an inlet channel 101 is buried in the top end of the valve body 100, and an outlet channel 102 is buried in the bottom end of the valve body 100 The bottom end of the inlet channel 101 is connected with the top end of the spring seat 2, and the top end of the outlet channel 102 is connected with 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 the end of the scraper seat 3 facing the ball 300, and 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, which is used to push the scraper seat 3 in a direction away from the ball 300 so that the scraper portion 4 is in a state of being separated from the ball 300, and a high-pressure fluid is introduced into the inlet channel 101, and the high-pressure fluid flows out along the inlet channel 101, the spring seat 2, and the outlet channel 102 in turn, which is used to flush the main elastic member, and part of the high-pressure fluid is filled in the gap 5, which is used to push the scraper seat 3 in the direction of the ball 300, so that the scraper portion 4 is in a state of tightly abutting the outer side of the ball 300.

[0039] The present invention is based on the basic structural principle of existing large-diameter hard-sealed ball valves, such as Figure 1 As shown, it includes a valve body 100, a flow channel 200 is provided in the valve body 100, a ball 300 is provided in the flow channel 200, and cutouts 301 are provided at both ends of the ball 300, which is equivalent to a sphere being cut at both sides thereof, a hollow channel 302 is opened in the ball 300, and both ends of the hollow channel 302 are connected to the cutout 301. Specifically, a valve stem 500 is connected to the top of the ball 300, which is used to drive the ball 300 to rotate axially. For example, when the cutout 301 is facing the flow channel 200, the liquid in the valve body 100 flows through the flow channel 200 and the hollow channel 302. When the ball 300 rotates axially by 90°, the cutout 301 is away from the flow channel 200, and the flow channel 200 is blocked by the ball 300, thereby realizing the on-off control of the ball valve;

[0040] like Figure 1 , Figure 2 As shown, valve seats 1 are symmetrically arranged at both ends of the ball 300 in the valve body 100, one end of the valve seat 1 abuts against the ball 300 to form a hard-sealed sealing surface 400, and a spring seat 2 is arranged in the valve body 100, which is located at one end of the valve seat 1 away from the ball 300, and a main elastic member is arranged in the spring seat 2, which is equivalent to the spring element in the existing conventional large-caliber hard-sealed ball valve, and is used to elastically push the spring seat 2 toward the ball 300, so that one end of the valve seat 1 is tightly abutted against the ball 300, thereby, the sealing surface 400 is equivalent to the fixed scraper of the existing conventional hard-sealed ball valve, and during the rotation and use of the ball 300, the sealing surface 400 always abuts closely against the outer ring of the cutout 301, so as to achieve the hard sealing of the ball 300 and the scraping of impurity particles outside the ball 300;

[0041] In particular, 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. The top end of the inlet channel 101 and the bottom end of the outlet channel 102 respectively pass through the valve body 100 and are connected to a switch valve 103 for controlling the on-off of the channel. A scraper seat 3 is provided in the valve body 100. 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 the 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. The secondary elastic member 6 can adopt existing conventional elastic components such as disc springs to push the scraper seat 3 in a direction away from the ball 300. Figure 1 , Figure 2 , Figure 3As shown, the scraper portion 4 is in a state of being separated from the ball 300. After long-term use, the main elastic member in the spring seat 2 may be corroded by the liquid flowing in the ball valve, the accumulation of fine impurity particles in the liquid, or the aging of the spring element itself, thereby affecting the hard sealing effect. By opening the switch valve 103 and passing high-pressure fluid into the inlet channel 101, the high-pressure fluid can be clean compressed air, high-pressure pure water, etc. Figure 4 , Figure 5 , Figure 6 As shown, the high-pressure fluid flows out along the inlet channel 101, the spring seat 2, and the outlet channel 102 in sequence, which is used to flush the main elastic member, bring out the infiltrated liquid, fine impurity particles in the liquid, aging residue of the spring element itself, etc., and part of the high-pressure fluid is filled into the gap 5, and the high pressure effect is used to push the scraper seat 3 toward the direction of the ball 300, so that the scraper part 4 is in a state of tightly abutting the outside of the ball 300. The scraper part 4 is equivalent to a movable scraper independent of the sealing surface 400 (fixed scraper) provided in the valve body 100. During normal use, the scraper part 4 shrinks with the scraper seat 3 and does not contact the ball 300 to avoid wear. After a certain period of use, or it is sensed that the hard sealing ability of the ball valve decreases, or it is sensed that there is a small amount of infiltration in the spring seat 2. When the sealing surface 400 is in contact with the outer surface of the sphere 300, the scraper portion 4 is moved outward to remove the wall-hanging solid impurities on the outer surface of the sphere 300 that is not in contact with the sealing surface 400, thereby preventing the wall-hanging solid impurities from penetrating into the sealing surface 400 and causing additional wear on the sphere 300 or the sealing surface 400, thereby 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 portion 4 plays a protective role in removing wall-hanging impurities and a role as a standby auxiliary hard seal. During normal use, the scraper portion 4 is movably retracted to avoid wear on the scraper portion 4.

[0042] Among them, if the hard sealing performance of the sealing surface 400 decreases, the switch valve 103 of the inlet channel 101 can also be opened, while the switch valve 103 of the outlet channel 102 is kept closed. By utilizing the high-pressure fluid filled in, the scraper part 4 can be kept in close contact with the outside of the ball 300, thereby playing a role in auxiliary hard sealing.

[0043] Among them, considering that in actual use, the probability of large-scale penetration in the valve seat 1, the spring seat 2, and the scraper seat 3 is extremely low, so when a small amount of penetration occurs, the small amount of penetrated liquid can be flushed away by the high-pressure fluid, thereby playing a role in protecting the spring element. After flushing, the switch valve 103 of the inlet channel 101 is closed first, and after the outlet channel 102 is emptied, the switch valve 103 of the outlet channel 102 is closed.

[0044] In an embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, stepped grooves 7 are symmetrically provided at both ends of the sphere 300 in the valve body 100, 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 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 groove 7, and the valve seat 1, the spring seat 2, the scraper seat 3 and between them and the stepped groove 7 are all movably arranged.

[0045] The outer ring of the valve seat 1 is 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 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 is set as an opening, and a first gap 8 is left between the first side groove wall 72, and the main elastic member can be arranged along the inner circumference of the spring seat 2. Multiple, and the position of the arrangement avoids the bottom end of the spring seat 2, and one end of the main elastic member The scraper seat 3 is connected to the inner wall of the spring seat 2, and the other end passes through the first gap 8 along the opening and is connected to the first side groove wall 72, so as to elastically push the spring seat 2 toward the direction of the ball 300. 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 circle of its T-shaped horizontal side. The outer end of the T-shaped vertical side of the scraper seat 3 is against the L-shaped horizontal side of the spring seat 2. The inner circle 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 edge of the blade seat 3 is respectively pressed against the inner ring of the valve seat 1, the inner ring 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 to provide space for the scraper seat 3 to move laterally. When high-pressure fluid is filled into the spring seat 2, on the one hand, it has a tendency to push the spring seat 2 toward the direction of the ball 300, but because the sealing surface 400 maintains a hard sealing 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 is filled 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 laterally and extend out, and compress the secondary elastic member 6.

[0046] In an embodiment of the present invention, 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, Figure 7 , Figure 8 As shown, a fourth sealing ring 13 is provided in the second gap 9, and 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. During normal use, the scraper portion 4 moves and contracts with the scraper seat 3 so that the end of the fourth sealing ring 13 is tightly against the slot 75, which further enhances the sealing effect. The pressure of the liquid in the flow channel 200 is used to press the fourth sealing ring 13 vertically, which can also further enhance the sealing effect. Preferably, a toothed structure is further provided between the inner wall of the slot 75 and the fourth sealing ring 13. When the scraper seat 3 is in a state of active contraction or extension, the toothed structure engages, which further enhances the sealing effect.

[0048] As another embodiment of the present invention, Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 As shown, an outer knife seat 14 is provided in 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, and is also designed as an integral annular structure and is clamped in the valve body 100. A fifth sealing ring 15 is provided between the outer ring of the outer knife seat 14 and the valve body 100, and an outer scraper 141 is connected to the side of the outer knife seat 14 facing the ball 300, and a side channel is provided on the side of the inlet channel 101 and the outlet channel 102 facing the outer knife seat 14, so that when a high-pressure fluid is introduced into the inlet channel 101, as shown in FIG. Fig.12 , Fig.13 As shown, part of the high-pressure fluid pushes the outer blade seat 14 along the side channel so that the outer scraper 141 abuts against the outer side of the sphere 300. As a result, the outer scraper 141 cooperates with the scraper part 4 to achieve the effect of a double-active scraper. The outer scraper 141 is conducive to removing dust and impurities accumulated at the outer circle of the incision 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, which not only protects the sealing surface 400 from being worn by these particles, but also ensures the stability of the valve switching torque.

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

[0050] In an embodiment of the present invention, Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 As shown, 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 of the contact surface of the scraper portion 4 and the ball 300 is designed to be acute-angled, and the edge of the inner circle of the contact surface of the outer scraper 141 and the ball 300 is designed to be acute-angled, so as to achieve the purpose of efficiently removing particulate matter attached to the surface of the ball 300, thereby protecting the sealing surface 400 from being worn by these particulate matter and ensuring the stability of the valve switching torque.

[0051] Among them, Fig.12 , Fig.13 As shown, the trapezoidal area between the valve seat 1 and the spring seat 2 can be set as a conical graphite ring for multi-faceted sealing, and a non-return structure such as a one-way permeable membrane 16 can also be set at one of the side surfaces of the conical graphite ring or in the side channel. After long-term use, if a small amount of liquid is stored in the space of the secondary elastic member 6, the liquid is stored at the bottom of the annular space of the secondary elastic member 6, and penetrates into the outlet channel 102 along the seam and the one-way permeable membrane 16 and the side channel in one direction, 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 can be taken away together, and at the same time, the high-pressure fluid is prevented from reversely filling the annular space of the secondary elastic member 6. Refer to Fig.12 , Fig.13 Even without a non-return structure such as the one-way permeable membrane 16 , the high-pressure fluid is quickly discharged along the outlet channel 102 and it is difficult to reversely penetrate into the secondary elastic member 6 .

[0052] In an embodiment of the present invention, Figure 7 , Figure 8 As shown, a vertical groove 401 is provided at the bottom end of the sealing surface 400 on the valve seat 1, and the top end of the scraper portion 4 extends into the vertical groove 401. The design of the extended scraper portion 4, on the one hand, is conducive to more efficient removal of particulate matter attached to the surface of the sphere 300, and on the other hand, when the scraper portion 4 is in a state separated from the sphere 300, it abuts against the inner wall of the vertical groove 401, which is conducive to further enhancing the sealing effect.

[0053] The present invention also provides a method for using a large-caliber hard-sealed ball valve structure, comprising the following steps:

[0054] 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 direction of the ball 300, so that the scraper portion 4 is in a state of tightly abutting the outer side of the ball 300.

[0055] If the hard sealing performance of the ball valve needs to be improved, the switch valve 103 of the inlet channel 101 can be opened, while the switch valve 103 of the outlet channel 102 is kept closed, and the high-pressure fluid filled into the inlet channel 101 is used to keep the scraper part 4 in close contact with the outside of the ball 300.

[0056] 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 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 a 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 outside of the sphere (300).

2. A large-caliber hard-sealed ball valve structure according to claim 1, characterized in that: 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).

3. A large-caliber hard-sealed ball valve structure according to claim 2, characterized in that: 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).

4. A large-caliber hard-sealed ball valve structure according to claim 3, 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).

5. A large-caliber hard-sealed ball valve structure according to claim 3, 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).

6. A large-caliber hard-sealed ball valve structure according to claim 3, 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).

7. A large-caliber hard-sealed ball valve structure according to claim 6, 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.

8. 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).

9. A method of using the large-diameter hard-sealed ball valve structure according to any one of claims 1 to 8, 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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