Elastic ball core compensation ball valve

Abstract

The utility model discloses an elastic ball core compensation ball valve, relates to the technical field of ball valves, and solves the problems of unreliable sealing performance, large torque and the like. A section notch is formed in the top of the ball core and extends to the outer surface of the ball core along the inner wall of the runner; an opening mechanism is arranged between the ball core and the valve rod and comprises an opening block and two pin shafts, the pin shafts are horizontally and fixedly inserted into the opening block in a penetrating mode, inclined guide holes are formed in the positions, on the two sides of the section notch, of the ball core respectively, and the distance between the two inclined guide holes is gradually increased from bottom to top. The two ends of the pin shaft respectively penetrate into the corresponding inclined guide holes and move according to the guide directions of the inclined guide holes so as to enlarge or reduce the size of a section notch; the opening block and the pin shaft in the opening mechanism are matched with the inclined guide hole, so that the size of a section notch at the top of the ball core can be enlarged according to needs, and the ball core is slightly expanded outwards to deform, so that the ball core is tightly attached to the valve seat, reliable sealing is realized, and the operation torque is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a ball valve with an elastic spherical core and compensation. Background Art

[0002] In industrial production and fluid transportation, ball valves are a common control valve used in various pipeline systems. Traditional ball valves typically utilize a fixed ball structure, which presents limitations in terms of sealing performance and operating torque. Sealing reliability is a key performance indicator for ball valves. Many important industrial applications, such as those in the petroleum, chemical, and natural gas industries, require ball valves to achieve zero or very low leakage to ensure production safety and environmental protection. Furthermore, reducing operating torque can improve ball valve operation convenience and efficiency, reducing operator workload.

[0003] While ball valves currently on the market are continuously improving, they still struggle to fully meet actual needs. Some ball valves lack sealing performance and are prone to leakage. Others, to improve sealing, set extremely high preloads between the valve seat and the ball. This inevitably increases opening and closing torque, leading to jamming during opening and closing or severe wear on the sealing surface, causing significant operational inconvenience. Consequently, achieving a balanced balance between sealing and torque is difficult. Summary of the Invention

[0004] The purpose of the utility model is to overcome the defects of the prior art, provide a ball valve with elastic spherical core and solve the problems of unreliable sealing and large torque of the existing ball valve.

[0005] The technical solution of the utility model comprises a valve stem, a valve seat, a bracket, a middle body, valve covers on both sides of the middle body and a ball core with elasticity, the valve seat is installed in the valve cover, a driving member is installed on the top of the valve stem, the valve stem passes through the bracket and penetrates into the middle body to be connected with the ball core, a flow channel is provided in the ball core, a cross-sectional cut is provided on the top of the ball core, the cross-sectional cut extends along the inner wall of the flow channel to the outer surface of the ball core; an opening mechanism is provided between the ball core and the valve stem, the opening mechanism comprises an opening block and two pins, the pins are fixed horizontally and inserted into the opening block, oblique guide holes are respectively provided in the ball core on both sides of the cross-sectional cut, and the two oblique guide holes are gradually expanded from bottom to top. They respectively form an angle with the central axis of the valve stem, and the two ends of the pin shaft are respectively inserted into the oblique guide holes and move according to the guiding direction of the oblique guide holes to expand or reduce the size of the cross-sectional incision; a rotating mechanism is provided between the bracket and the valve stem, and the rotating mechanism includes a handle, a mounting hole opened in the radial direction of the valve stem, and a right-angled track hole opened on the bracket. The handle is inserted into the track hole to form a fixed connection with the mounting hole. The track hole includes a vertical section and a horizontal section extending horizontally from the top of the vertical section. When the handle is located in the horizontal section, it can drive the valve stem to rotate to rotate the ball core. When the handle is located in the vertical section, the valve stem is driven to rise and fall through the driving member to raise or press down the support block.

[0006] By adopting the above technical solution, through the cooperation of the expansion block and the pin shaft with the oblique guide hole in the expansion mechanism, the size of the cross-sectional cutout at the top of the ball core can be expanded as needed, so that the ball core slightly expands outward and deforms, so that the ball core and the valve seat fit tightly, achieving reliable sealing, and effectively solving the problems of insufficient sealing performance and prone to leakage of existing ball valves; and, while ensuring the sealing performance, no excessive pre-tightening force is required. When needed, the handle is operated to move the pin shaft in the oblique guide hole, reducing the cross-sectional cutout, and the ball core is disengaged from the valve seat, thereby reducing the operating torque, improving the operating convenience and efficiency of the ball valve, reducing the wear of the sealing surface, and extending the service life of the ball valve.

[0007] In one possible design, a shaft portion is integrally extended from the bottom end of the ball core, and the bottom end of the shaft portion forms a ball head portion. The shaft portion passes through the middle body, and an end cover is fixedly mounted on the middle body. The end cover covers and wraps the ball head portion, and a thrust bearing is mounted inside the end cover. The thrust bearing is outermostly mounted on the shaft portion and presses against the top surface of the ball head portion.

[0008] With the above design, the ball head and the shaft further enhance the support and positioning of the ball core, reduce the shaking and deviation of the ball core during operation, ensure the normal operation of the ball valve, and provide a more stable support structure for the ball core. At the same time, the use of the thrust bearing can reduce the friction coefficient, withstand a certain axial force, share the axial load on the ball core, and further reduce the wear between the shaft and the end cover.

[0009] In a possible design, a spherical groove is provided in the end cover, and the spherical groove fits the shape of the ball head and forms a sliding contact.

[0010] The above design has a good limiting effect on the ball core, which can effectively limit the freedom of the ball core in multiple directions so that it can only rotate within a specific range, thereby reducing the shaking and deviation of the ball core during operation. It can also adapt to the possible deformation or position change of the ball core to a certain extent, always maintain a good contact state, ensure that the sealing effect is not affected by changes in working conditions, and maintain stable sealing performance.

[0011] In a possible design, the handle is connected to the mounting hole via a threaded connection, a telescopic sleeve is mounted on the handle, and the telescopic sleeve and the handle are telescopically matched.

[0012] With the above design, when the ball valve needs to be maintained in a certain state for a long time, the handle can be removed to facilitate maintenance and replacement operations. Moreover, the length of the handle can be adjusted according to the operator's needs through the telescopic sleeve, so that the handle can adapt to narrow environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the utility model in a closed state;

[0014] Figure 2 This is a schematic diagram of the structure of the ball core, valve stem and other components of the utility model Figure 1 ;

[0015] Figure 3 This is a schematic diagram of the partial structure of the utility model after the valve stem rises;

[0016] Figure 4 This is a schematic diagram of the structure of the ball core, valve stem and other components of the utility model Figure 2 ;

[0017] Figure 5 This is a partial structural diagram of the bracket position of the utility model;

[0018] Among them, 1. valve stem; 2. valve seat; 3. bracket; 4. middle body; 41. end cover; 411. spherical groove; 42. thrust bearing; 5. valve cover; 6. handwheel; 7. ball core; 71. flow channel; 72. cross-section cut; 73. ball rod; 74. ball head; 8. expansion mechanism; 81. expansion block; 82. pin; 83. oblique guide hole; 9. rotating mechanism; 91. handle; 92. mounting hole; 93. track hole; 931. vertical section; 932. horizontal section; 94. telescopic sleeve. DETAILED DESCRIPTION

[0019] like Figure 1-Figure 5The illustrated embodiment of a ball valve with an elastic core and a compensation ball valve comprises a valve stem 1, a valve seat 2, a bracket 3, a middle body 4, valve covers 5 on either side of the middle body 4, and a resilient ball core 7. The valve seat 2 is mounted within the valve cover 5 and seals with the ball core 7. A driver is mounted on the top of the valve stem 1, which penetrates the bracket 3, enters the middle body 4, and connects to the ball core 7. The ball core 7 has a flow channel 71 for the medium to pass through. A cross-sectional cutout 72 is formed at the top of the ball core 7. The cross-sectional cutout 72 extends along the inner wall of the flow channel 71 to the outer surface of the ball core 7. The cross-sectional cutout 72 is essentially a cutout formed outwardly along the inner wall of the flow channel 71. The sidewalls formed by the cross-sectional cutout 72 have a certain spacing when unstressed. A spreading mechanism 8 is provided between the ball core 7 and the valve stem 1. The spreading mechanism 8 includes a spreading block 81 and two pins 82. The pins 82 are fixed horizontally and inserted into the spreading block 81. A cavity for accommodating the spreading block 81 is provided on the ball core 7. Oblique guide holes 83 are respectively provided in the ball core 7 on both sides of the cross-sectional cut 72. The distance between the two oblique guide holes 83 gradually increases from bottom to top, and the main guiding directions of the oblique guide holes 83 form an angle of 1° to 6° with the central axis of the valve stem 1. The two ends of the pin 82 are respectively inserted into the oblique guide holes 83 and move according to the guiding direction of the oblique guide holes 83 to expand or reduce the size of the cross-sectional cut 72. A rotating mechanism 9 is provided between the bracket 3 and the valve stem 1. The rotating mechanism 9 includes a handle 91, a mounting hole 92 radially disposed in the valve stem 1, and a right-angled track hole 93 disposed in the bracket 3. The handle 91 passes through the track hole 93 and is fixedly connected to the mounting hole 92. The track hole 93 includes a vertical section 931 and a horizontal section 932 extending horizontally from the top of the vertical section 931. When the handle 91 is within the horizontal section 932, it drives the valve stem 1 to rotate, thereby rotating the ball core 7. When the handle 91 is within the vertical section 931, the driving member drives the valve stem 1 to rise and fall, thereby raising or lowering the support block 81. The ball core 7 is made of a metal material with elastic deformation capability. The driving member can be a handwheel 6 or a valve actuator to control the raising and lowering of the valve stem 1.

[0020] When the ball valve needs to be opened, the operator drives the valve stem 1 up through the drive member, and the handle 91 rises along the vertical section 931. At this time, the valve stem 1 drives the expansion block 81 to move upward. Due to the inclined structure of the oblique guide hole 83, the pin shaft 82 will move along the guide direction in the oblique guide hole 83, so that the side wall spacing of the cross-sectional cut 72 is reduced, and the ball core 7 is deformed inward, thereby creating a certain gap between the ball core 7 and the valve seat 2; then, the operating handle 91 moves the handle 91 in the horizontal section 932, driving the valve stem 1 to rotate 90°, and the flow channel 71 in the ball core 7 is connected to the flow channel 71 in the valve cover 5. The fluid can circulate through the flow channel 71 in the ball core 7, thereby realizing the opening of the ball valve.

[0021] To close the ball valve, first operate handle 91, moving it from horizontal section 932 into vertical section 931. Ball core 7 is then forced to rotate back into position. The driver then lowers valve stem 1, pushing expansion block 81 downward. Pin 82 moves within oblique guide hole 83, along the guide direction, toward the inside of oblique guide hole 83. This opens cross-sectional cutout 72 at the top of ball core 7, widening the distance between the sidewalls of cutout 72. This causes ball core 7 to expand outward, allowing it to fit tightly against valve seat 2. This outward expansion ensures sufficient contact pressure between ball core 7 and valve seat 2, achieving a good seal and blocking the flow of fluid, thus completing the ball valve's closing operation.

[0022] During the opening and closing process, the elastic properties of ball core 7 play a significant role, enabling it to deform appropriately under the action of expansion block 81 and pin 82, ensuring smooth sealing and opening operations. This ensures the ball valve's sealing performance while reducing operating torque during opening, improving its ease of operation and overall performance.

[0023] A shaft portion 73 integrally extends downward from the bottom end of the ball core 7. The bottom end of the shaft portion 73 forms a ball head 74. The shaft portion 73 extends through the middle body 4. An end cap 41 is fixedly mounted on the middle body 4, covering and enveloping the ball head 74. A thrust bearing 42 is mounted within the end cap 41. The thrust bearing 42 is positioned over the shaft portion 73 and abuts against the top surface of the ball head 74. The thrust bearing 42 prevents the ball core 7 from shifting upward under load, ensuring that the ball core 7 can deform at the predetermined position. The high precision and low friction of the thrust bearing 42 help improve the rotational accuracy of the ball core 7 and reduce operational errors caused by friction and shaking.

[0024] A spherical groove 411 is provided in the end cap 41. The spherical groove 411 fits the shape of the ball head 74 and forms a sliding contact. The sliding contact between the two has good sliding characteristics, which can reduce the friction resistance of the ball core 7 during the movement, making the rotation of the ball core 7 smoother, reducing the operating torque, and improving the operational flexibility and efficiency of the ball valve.

[0025] The handle 91 is threadedly connected to the mounting hole 92. A telescopic sleeve 94 is mounted on the handle 91, and the telescopic sleeve 94 is adapted to extend and retract with the handle 91. The telescopic nature of the telescopic sleeve 94 allows the length of the handle 91 to be adjusted according to the operator's needs. In confined operating environments, the handle 91 can be shortened for easier operation. In situations where greater operating force is required, the handle 91 can be extended to increase the torque, making operation easier.

Claims

1. A ball valve with an elastic core and compensation structure, comprising a valve stem, a valve seat, a bracket, a middle body, and valve covers on both sides of the middle body, wherein the valve seat is installed in the valve cover, and a driving member is installed at the top of the valve stem, characterized in that: The valve stem also includes a ball core with elasticity, wherein the valve stem passes through the bracket and enters the middle body to be connected to the ball core, wherein a flow channel is formed in the ball core, and a cross-section cut is formed on the top of the ball core, wherein the cross-section cut extends along the inner wall of the flow channel to the outer surface of the ball core; A spreading mechanism is provided between the ball core and the valve stem, and the spreading mechanism includes a spreading block and two pins, the pins being fixed horizontally and inserted into the spreading block, and oblique guide holes are respectively opened in the ball core on both sides of the cross-sectional cut, and the two oblique guide holes are gradually widened from bottom to top to form an angle with the central axis of the valve stem, respectively. The two ends of the pin are respectively inserted into the corresponding oblique guide holes and move according to the guiding direction of the oblique guide holes to expand or reduce the size of the cross-sectional cut; A rotating mechanism is provided between the bracket and the valve stem, and the rotating mechanism includes a handle, a mounting hole provided in the radial direction of the valve stem, and a right-angled track hole provided on the bracket. The handle is inserted into the track hole to form a fixed connection with the mounting hole. The track hole includes a vertical section and a horizontal section extending horizontally from the top of the vertical section. When the handle is located in the horizontal section, it can drive the valve stem to rotate to rotate the ball core. When the handle is located in the vertical section, the valve stem is driven to rise and fall by the driving member to raise or press down the support block.

2. The elastic ball-core compensating ball valve according to claim 1, characterized in that: A shaft portion is integrally extended from the bottom end of the ball core, and the bottom end of the shaft portion forms a ball head portion. The shaft portion passes through the middle body, and an end cover is fixedly mounted on the middle body. The end cover covers and wraps the ball head portion, and a thrust bearing is mounted inside the end cover. The thrust bearing is outer-circuited on the shaft portion and abuts against the top surface of the ball head portion.

3. The elastic ball-core compensating ball valve according to claim 2, characterized in that: A spherical groove is provided in the end cover, and the spherical groove fits the shape of the ball head and forms a sliding contact.

4. The elastic ball-core compensating ball valve according to claim 1 or 2, characterized in that: The handle is connected to the mounting hole via a thread, a telescopic sleeve is mounted on the handle, and the telescopic sleeve and the handle are telescopically matched.

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