Zero-friction hard-seal ball valve

Abstract

This invention relates to the field of valve technology and proposes a zero-friction hard-seal ball valve that is difficult for unauthorized personnel to open and close. The valve includes a valve body, a fluid passage within the valve body, a valve ball rotatably disposed within the valve body for sealing the fluid passage, a valve seat disposed within the valve body for cooperating with the valve ball to seal the fluid passage, and a valve stem rotatably disposed on the valve body with one end connected to the valve ball. A drive device is also provided between the valve body and the valve stem for driving the valve stem to rotate and preventing unauthorized personnel from driving the valve stem. The drive device includes: a protective shell disposed on the valve body, a worm gear disposed on the valve stem, and a worm rotatably disposed within the protective shell and meshing with the worm gear via a dense rotation device.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a zero-friction hard-seal ball valve. Background Technology

[0002] A ball valve is a valve in which the valve stem drives the valve to rotate around the valve axis. It can be used for fluid regulation and control. Ball valves are wear-resistant, especially hard-seal ball valves. Because their valve core and sealing ring are made of alloy steel, they have a longer service life than soft-seal ball valves. Moreover, the valve core and sealing ring undergo multiple manual grinding processes to reduce friction and improve sealing performance. Therefore, hard-seal ball valves are also called zero-friction hard-seal ball valves. However, most ball valves do not have a sealing function. If they are opened or closed arbitrarily by others, causing them to be opened or closed at inappropriate times or adjusted to inappropriate sizes (ball valves should be fully open; half-open ball valves are prone to wear), it is extremely easy to damage water pipelines and cause significant economic losses. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention proposes a zero-friction hard-seal ball valve that is not easily opened or closed by unauthorized personnel.

[0004] To achieve the above objectives, the technical solution of the present invention provides a zero-friction hard-seal ball valve, comprising a valve body, a fluid passage formed within the valve body, a valve ball rotatably disposed within the valve body for sealing the fluid passage, a valve seat disposed within the valve body for cooperating with the valve ball to seal the fluid passage, and a valve stem rotatably disposed on the valve body with one end connected to the valve ball. A driving device is further provided between the valve body and the valve stem for driving the valve stem to rotate and preventing unauthorized personnel from driving the valve stem to rotate. The driving device includes: a protective shell disposed on the valve body, a worm gear disposed on the valve stem, and a worm rotatably disposed within the protective shell and meshing with the worm gear via a re-rotation device.

[0005] A further improvement is that the encrypted rotating device includes: two first bearing seats disposed inside the protective shell and located on the same axis; the worm gear is disposed between the first bearing seats; an extension rod is connected to any end of the worm gear; and a rotating device for the user to drive the worm gear to rotate from the outside is disposed between the extension rod and the protective shell.

[0006] A further improvement is that the rotating device includes: a second bearing seat located on the same axis as the first bearing seat within the protective shell; a rotating rod located within the second bearing seat with one end located outside the protective shell; and a connecting sleeve located on the rotating rod. The connecting sleeve is engaged with the extension rod via a locking device.

[0007] A further improvement is that the engaging device includes: an insertion hole on the extension rod, an engaging groove on the connecting sleeve facing the extension rod, and an engaging block that can slide up and down on the extension rod via a sliding limiting device for engaging with the engaging groove.

[0008] A further improvement is that the sliding limiting device includes: a first magnetic block disposed in the insertion hole; a sliding hole disposed on the extension rod and connected to the insertion hole for allowing the locking block to slide up and down; a limiting block disposed on the locking block; a limiting groove disposed on the extension rod for preventing the locking block from sliding down excessively; an insertion channel disposed on the rotating rod and located on the same axis as the insertion hole; and an opening and closing rod that can be inserted into the insertion hole to lift the locking block, wherein the end of the opening and closing rod is also provided with a chamfer.

[0009] A further improvement is that the connecting sleeve is also equipped with a positioning device to prevent excessive rotation of the worm gear and to facilitate the determination of whether the valve ball has rotated to the correct position.

[0010] A further improvement is that the positioning device includes: a positioning sleeve threaded to the outside of the connecting sleeve; a positioning groove formed on the positioning sleeve; a positioning block that can be slidably disposed in the protective shell by a magnetic device for engaging with the positioning groove; a first positioning block disposed on the rotating rod; and a second positioning block disposed on the extension rod.

[0011] A further improvement is that the magnetic device includes at least two guide rods disposed within the protective shell, the positioning block being sleeved on the guide rods, and a second magnetic block being disposed on the side of the positioning block near the protective shell.

[0012] A further improvement is that a pressure bearing is also provided on the second positioning block near the positioning sleeve.

[0013] A further improvement is that the rotating rod is also equipped with a handwheel to facilitate the user's rotation of the rotating rod.

[0014] The advantages and beneficial effects of this invention are as follows: 1. The structure is simple and easy to use. It has a high-security rotating device that prevents non-operators from opening and closing the ball valve, thus avoiding adverse consequences caused by improper opening and closing, extending the service life of the ball valve and avoiding waste of resources.

[0015] 2. Equipped with a positioning device, it allows operators to intuitively feel the opening and closing status of the valve when opening and closing it, avoiding the ball valve being half-open, extending the service life of the ball valve, and preventing waste of resources. Attached Figure Description

[0016] Figure 1This is a front cross-sectional view of a zero-friction hard-seal ball valve according to the present invention. Figure 1 ; Figure 2 This is a front cross-sectional view of a zero-friction hard-seal ball valve according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of a zero-friction hard-seal ball valve protective shell according to the present invention; Figure 4 This is an enlarged schematic diagram of part A of a zero-friction hard-seal ball valve according to the present invention; In the diagram: 1. Valve body; 2. Fluid passage; 3. Valve ball; 4. Valve seat; 5. Valve stem; 6. Protective shell; 7. Worm gear; 8. Worm; 9. First bearing seat; 10. Extension rod; 11. Second bearing seat; 12. Rotating rod; 13. Connecting sleeve; 14. Insertion hole; 15. Engaging groove; 16. Engaging block; 17. First magnetic block; 18. Sliding hole; 19. Limiting block; 20. Limiting groove; 21. Insertion channel; 22. Opening / closing rod; 23. Chamfer; 24. Positioning sleeve; 25. Positioning groove; 26. Positioning block; 27. First positioning block; 28. Second positioning block; 29. ​​Guide rod; 30. Second magnetic block; 31. Pressure bearing; 32. Handwheel. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0018] like Figures 1-4 As shown, a zero-friction hard-seal ball valve includes a valve body 1, a fluid passage 2 opened within the valve body 1, a valve ball 3 rotatably disposed within the valve body 1 for sealing the fluid passage 2, a valve seat 4 disposed within the valve body 1 for cooperating with the valve ball 3 to seal the fluid passage 2, and a valve stem 5 rotatably disposed on the valve body 1 with one end connected to the valve ball 3. A driving device is also provided between the valve body 1 and the valve stem 5 for driving the valve stem 5 to rotate and preventing unauthorized personnel from driving the valve stem 5 to rotate. The driving device includes: a protective shell 6 disposed on the valve body 1, a worm gear 7 disposed on the valve stem 5, and a worm 8 rotatably disposed within the protective shell 6 and meshing with the worm gear 7 via a dense rotation device.

[0019] To prevent unauthorized personnel from rotating the worm gear 8, the encrypted rotating device includes: two first bearing seats 9 disposed within the protective shell 6 and located on the same axis; the worm gear 8 is disposed between the first bearing seats 9; an extension rod 10 is connected to any end of the worm gear 8; a rotating device for externally driving the worm gear 8 is provided between the extension rod 10 and the protective shell 6; the rotating device includes: a second bearing seat 11 disposed within the protective shell 6 and located on the same axis as the first bearing seats 9; a rotating rod 12 disposed within the second bearing seat 11 and with one end located outside the protective shell 6; and a connecting sleeve 13 disposed on the rotating rod 12; the connecting sleeve 13 is engaged with the extension rod 10 via a locking device; the locking device includes: an insertion hole 14 opened on the extension rod 10; a locking groove 15 opened on the connecting sleeve 13 facing the extension rod 10; and a locking block 16 disposed on the extension rod 10, which can slide up and down via a sliding limiting device, for engaging with the locking groove 15.

[0020] To facilitate the engagement of the connecting sleeve 13 and the locking block 16 by the operator, thereby opening and closing the ball valve, the sliding limiting device includes: a first magnetic block 17 disposed in the insertion hole 14; a sliding hole 18 disposed on the extension rod 10 and connected to the insertion hole 14 for allowing the locking block 16 to slide up and down; a limiting block 19 disposed on the locking block 16; a limiting groove 20 disposed on the extension rod 10 for preventing the locking block 16 from sliding down excessively; an insertion channel 21 disposed on the rotating rod 12 and located on the same axis as the insertion hole 14; and an opening and closing rod 22 that can be inserted into the insertion hole 14 to push up the locking block 16, wherein the end of the opening and closing rod 22 is also provided with a chamfer 23.

[0021] To ensure that the operator can precisely turn the ball 3 to the fully open or fully closed position when opening and closing the ball valve, the connecting sleeve 13 is also equipped with a positioning device to prevent over-rotation of the worm gear 8 and to facilitate the determination of whether the ball 3 has rotated to the correct position. The positioning device includes: a positioning sleeve 24 threaded to the outside of the connecting sleeve 13; a positioning groove 25 formed on the positioning sleeve 24; a positioning block 26 that can be slidably disposed in the protective shell 6 by a magnetic device for engaging with the positioning groove 25; a first positioning block 27 disposed on the rotating rod 12; and a second positioning block 28 disposed on the extension rod 10.

[0022] To prevent the extension rod 10 from rotating when the positioning sleeve 24 presses against the second positioning block 28, the magnetic device includes at least two guide rods 29 disposed inside the protective shell 6, the positioning block 26 being sleeved on the guide rods 29, and a second magnetic block 30 being disposed on the side of the positioning block 26 near the protective shell 6.

[0023] To further prevent the extension rod 10 from rotating when the positioning sleeve 24 presses against the second positioning block 28, a pressure bearing 31 is also provided on the end of the second positioning block 28 near the positioning sleeve 24.

[0024] The rotating rod 12 is also equipped with a handwheel 32 to facilitate the user's rotation of the rotating rod 12.

[0025] Working principle: When in use, insert the opening and closing rod 22 into the insertion channel 21, and lift the locking block 16 by the chamfer 23 to complete the connection between the connecting sleeve 13 and the extension rod 10.

[0026] Then, place the magnetic block that is magnetically repelled by the second magnetic block 30 on the protective shell 6 at the position corresponding to the second magnetic block 30, so that the positioning block 26 engages with the positioning groove 25.

[0027] At this time, turning the handwheel 32 will drive the extension rod 10 and the worm gear 8 to rotate together, thereby driving the worm wheel 7 to rotate and open or close the valve. At the same time, since the positioning sleeve 24 is threadedly connected to the connecting sleeve 13 and its direction of movement is fixed by the positioning block 26 and the positioning groove 25, the positioning sleeve 24 will slide back and forth along the direction of the positioning groove 25. When it slides to the second positioning block 28, the valve is in the fully open or fully closed state. When it slides to the first positioning block 27, the opposite is true. This allows the operator to clearly adjust the valve to the fully open or fully closed state, extending the service life of the valve.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A zero-friction hard-seal ball valve, comprising a valve body, a fluid passage formed within the valve body, a valve ball rotatably disposed within the valve body for sealing the fluid passage, a valve seat disposed within the valve body for cooperating with the valve ball to seal the fluid passage, and a valve stem rotatably disposed on the valve body and connected at one end to the valve ball, characterized in that: A drive device for driving the valve stem to rotate and preventing unauthorized personnel from driving the valve stem to rotate is also provided between the valve body and the valve stem. The drive device includes: a protective shell provided on the valve body, a worm gear provided on the valve stem, and a worm that is rotatably provided in the protective shell and meshes with the worm gear through a dense rotation device. The encryption rotating device includes: two first bearing seats disposed inside the protective shell and located on the same axis; a worm gear disposed between the first bearing seats; an extension rod connected to any end of the worm gear; and a rotating device for the user to drive the worm gear to rotate from the outside between the extension rod and the protective shell. The rotating device includes: a second bearing seat disposed inside the protective shell and located on the same axis as the first bearing seat; a rotating rod disposed inside the second bearing seat and with one end located outside the protective shell; and a connecting sleeve disposed on the rotating rod, wherein the connecting sleeve is engaged with the extension rod by a locking device. The engaging device includes: an insertion hole on the extension rod, an engaging groove on the connecting sleeve facing the extension rod, and an engaging block that can slide up and down on the extension rod via a sliding limiting device for engaging with the engaging groove. The sliding limiting device includes: a first magnetic block disposed in the insertion hole; a sliding hole opened on the extension rod and connected to the insertion hole for allowing the locking block to slide up and down; a limiting block disposed on the locking block; a limiting groove opened on the extension rod for preventing the locking block from sliding down excessively; an insertion channel opened on the rotating rod and located on the same axis as the insertion hole; and an opening and closing rod that can be inserted into the insertion hole to push up the locking block, wherein the end of the opening and closing rod is also provided with a chamfer. The connecting sleeve is also equipped with a positioning device to prevent excessive rotation of the worm gear and to facilitate the determination of whether the valve ball has rotated to the correct position. The positioning device includes: a positioning sleeve threaded to the outside of the connecting sleeve; a positioning groove formed on the positioning sleeve; a positioning block that can be slidably disposed in the protective shell by a magnetic device for engaging with the positioning groove; a first positioning block disposed on the rotating rod; and a second positioning block disposed on the extension rod.

2. The zero-friction hard-seal ball valve according to claim 1, characterized in that: The magnetic device includes: at least two guide rods disposed inside the protective shell, the positioning block sleeved on the guide rods, and a second magnetic block disposed on the side of the positioning block near the protective shell.

3. The zero-friction hard-seal ball valve according to claim 1, characterized in that: A pressure bearing is also provided on the end of the second positioning block near the positioning sleeve.

4. The zero-friction hard-seal ball valve according to claim 1, characterized in that: The rotating rod is also equipped with a handwheel to facilitate the user's rotation of the rotating rod.

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