Low-temperature ball valve with good sealing performance

Abstract

The utility model discloses a low-temperature ball valve with good sealing performance, which belongs to the field of ball valves and comprises a valve body, a ball body movably mounted in the valve body, a valve rod fixedly connected to the upper portion of the ball body, a lower bearing movably mounted at the lower portion of the ball body, and a third sealing ring fixedly connected to the ball body and positioned between the lower bearing and the ball body. First sealing rings arranged on the two sides of a ball body are used for sealing the ball body, a metal positioning ring is used for positioning the first sealing rings through a positioning rod and a limiting ring, so that the first sealing rings cannot move, the sealing effect is kept, a T-shaped silica gel ring and a movable metal block are arranged on a valve rod, and when the valve rod rotates, the movable metal block moves downwards; the T-shaped silica gel ring is extruded, so that the T-shaped silica gel ring deforms and is attached to more positions of the inner wall of the valve body, the sealing capacity is enhanced, the sealing capacity of the valve body is higher, and in a low-temperature environment, more gaps between the valve rod and the valve body are filled with the deformed T-shaped silica gel ring, so that water is not prone to overflowing.

Description

Technical Field

[0001] The utility model relates to the field of ball valves, in particular to a low-temperature ball valve with good sealing performance. Background Art

[0002] Ball valve, the opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. Among them, the hard-sealed V-type ball valve has a strong shear force between the V-type ball core and the metal valve seat with hard alloy surfacing, which is particularly suitable for media containing fibers, tiny solid particles, etc. In the prior art, the Chinese utility model patent with the public document number: CN209800777U and the patent name "A ball valve with good sealing performance" discloses a ball valve. The document is connected at the upper and lower ends of the gap between the valve body and the ball. A number of sealing ring grooves are evenly arranged at equal intervals, and a number of sealing rubber bodies are arranged on the upper and lower ends of the sphere corresponding to the sealing ring grooves. When the sphere rotates, the sealing rubber body will rotate and move simultaneously in the sealing ring groove, which will not affect the rotation of the sphere of the structural body, thereby playing a sealing role and preventing water from overflowing from the outside of the ball valve through the rotating gap between the sphere and the valve body. However, in this solution, the sealing rubber body rotates with the sphere, which aggravates the wear between the sealing rubber body and the inner wall of the valve body, and quickly reduces the sealing ability of the sealing rubber body. Therefore, it is not desirable and needs to be improved. Utility Model Content

[0003] The main purpose of the utility model is to provide a low-temperature ball valve with good sealing performance, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A low-temperature ball valve with good sealing performance comprises a valve body, wherein a sphere is movably installed in the valve body, a valve stem is fixedly connected to the upper position of the sphere, a lower bearing is movably installed in the lower position of the sphere, a No. 3 sealing ring is fixedly connected to the sphere between the lower bearing and the sphere, a connecting seat is fixedly connected to the left and right sides of the valve body, a limiting ring is fixedly connected to the inside of the valve body at both sides of the sphere, a No. 1 sealing ring is fixedly connected to the side position of the limiting ring, a metal positioning ring is fixedly connected to the side position of the No. 1 sealing ring, an upper bearing is movably installed on the valve stem, a No. 2 sealing ring is fixedly connected to the valve stem at a position above the upper bearing, a T-shaped silicone ring is movably installed on the valve stem at a position above the No. 2 sealing ring, a movable metal block is movably installed on the valve stem at a position above the T-shaped silicone ring, connecting plates are fixedly connected to the two sides of the upper part of the valve body, and a guide rod is fixedly connected to the connecting plate.

[0006] Preferably, one end of the connecting seat is fixedly connected to a No. 1 flange, the other end of the connecting seat is fixedly connected to a No. 2 flange, and both sides of the valve body are also fixedly connected to a No. 2 flange. The connecting seat and the No. 2 flange of the valve body are fixedly connected by connecting bolts and connecting nuts.

[0007] Preferably, a positioning hole is formed on the first sealing ring, and the positioning hole does not penetrate the first sealing ring.

[0008] Preferably, a positioning rod is fixedly connected to the side position of the metal positioning ring, and the positioning rod is movably installed in the positioning hole of the No. 1 sealing ring, and the No. 1 sealing ring and the metal positioning ring are movably installed in the valve body and the connecting seat.

[0009] Preferably, a screw hole is provided at the center position of the movable metal block, and the movable metal block is movably mounted on the valve stem through the screw hole, a thread is also engraved on the upper position of the valve stem, connecting grooves are provided on both sides of the movable metal block, and guide holes are also provided on both sides of the movable metal block, and the guide holes are fixedly connected to the connecting grooves.

[0010] Preferably, the connecting plate and the guide rod are movably mounted in the connecting groove, a spring is movably mounted on the guide rod, and the spring is located above the connecting plate and in the connecting groove.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] In the utility model, the sphere is sealed by a No. 1 sealing ring provided at both sides of the sphere, and the metal positioning ring positions the No. 1 sealing ring through a positioning rod and a limiting ring, so that the No. 1 sealing ring will not shift and the sealing effect is maintained; a T-shaped silicone ring and a movable metal block are provided on the valve stem; when the valve stem rotates, the movable metal block moves downward to squeeze the T-shaped silicone ring, so that the T-shaped silicone ring is deformed and fits more positions of the inner wall of the valve body to enhance the sealing ability; when the valve stem is reset, the movable metal block and the T-shaped silicone ring are reset synchronously to avoid long-term squeezing of the T-shaped silicone ring, which may cause its complete deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic cross-sectional structure diagram of the connection seat and the valve body of the utility model;

[0015] Figure 3 This is a structural schematic diagram of a No. 1 sealing ring and a metal positioning ring of the utility model;

[0016] Figure 4 It is a structural schematic diagram of the movable metal block and the T-shaped silicone ring of the utility model.

[0017] In the figure: 1. valve body; 2. connecting seat; 3. ball; 4. No. 1 flange; 5. No. 2 flange; 6. connecting bolts; 7. connecting nuts; 8. limiting ring; 9. No. 1 sealing ring; 10. positioning hole; 11. positioning rod; 12. metal positioning ring; 13. valve stem; 14. upper bearing; 15. No. 2 sealing ring; 16. T-shaped silicone ring; 17. moving metal block; 18. connecting groove; 19. connecting plate; 20. guide rod; 21. spring; 22. guide hole; 23. lower bearing; 24. No. 3 sealing ring. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] like Figure 1-3 As shown, a low-temperature ball valve with good sealing performance includes a valve body 1, a ball 3 is movably installed in the valve body 1, a valve stem 13 is fixedly connected to the upper position of the ball 3, a lower bearing 23 is movably installed to the lower position of the ball 3, a No. 3 sealing ring 24 is fixedly connected to the ball 3 between the lower bearing 23 and the ball 3, a connecting seat 2 is fixedly connected to the left and right sides of the valve body 1, a limiting ring 8 is fixedly connected to the two sides of the ball 3 in the valve body 1, a No. 1 sealing ring 9 is fixedly connected to the side position of the limiting ring 8, a metal positioning ring 12 is fixedly connected to the side position of the No. 1 sealing ring 9, one end of the connecting seat 2 is fixedly connected to the No. 1 flange 4, the other end of the connecting seat 2 is fixedly connected to the No. 2 flange 5, and the two sides of the valve body 1 are also fixedly connected A No. 2 flange 5 is connected, and the No. 2 flange 5 of the connecting seat 2 and the valve body 1 is fixedly connected by connecting bolts 6 and connecting nuts 7. A positioning hole 10 is opened on the No. 1 sealing ring 9, and the positioning hole 10 does not penetrate the No. 1 sealing ring 9. A positioning rod 11 is fixedly connected to the side position of the metal positioning ring 12, and the positioning rod 11 is movably installed in the positioning hole 10 of the No. 1 sealing ring 9. The No. 1 sealing ring 9 and the metal positioning ring 12 are movably installed in the valve body 1 and the connecting seat 2. The side position of the restriction ring 8 is filled through the metal positioning ring 12 and the No. 1 sealing ring 9. A positioning rod 11 is provided on the metal positioning ring 12 and inserted into the No. 1 sealing ring 9, thereby positioning the No. 1 sealing ring 9 at the side position of the restriction ring 8, so that the No. 1 sealing ring 9 can better maintain sealing on the ball 3.

[0020] like Figure 1 , Figure 2 and Figure 4As shown, an upper bearing 14 is movably mounted on the valve stem 13, a No. 2 sealing ring 15 is fixedly connected to the valve stem 13 at a position above the upper bearing 14, a T-shaped silicone ring 16 is movably mounted on the valve stem 13 at a position above the No. 2 sealing ring 15, a movable metal block 17 is movably mounted on the valve stem 13 at a position above the T-shaped silicone ring 16, connecting plates 19 are fixedly connected to both sides of the upper part of the valve body 1, a guide rod 20 is fixedly connected to the connecting plate 19, a screw hole is opened at the center of the movable metal block 17, and the movable metal block 17 is movably mounted with the valve stem 13 through the screw hole, and a thread is also engraved on the upper part of the valve stem 13, and both sides of the movable metal block 17 are fixedly connected to the connecting plate 19. A connecting groove 18 is provided, and guide holes 22 are also provided on both sides of the movable metal block 17, and the guide holes 22 are fixedly connected with the connecting groove 18. The connecting plate 19 and the guide rod 20 are movably installed in the connecting groove 18. A spring 21 is movably installed on the guide rod 20. The spring 21 is located above the connecting plate 19 and in the connecting groove 18. The movable metal block 17 moves downward on the valve stem 13 through the screw hole, and the guide rod 20 passes upward in the guide hole 22. The spring 21 is compressed, and the T-shaped silicone ring 16 is squeezed by the movable metal block 17, so that the T-shaped silicone ring 16 is deformed downward, so that the T-shaped silicone ring 16 is more in contact with the inner wall of the valve body 1, thereby enhancing the sealing ability of the valve body 1.

[0021] It should be noted that the utility model is a low-temperature ball valve with good sealing performance. In a low-temperature environment, the rubber ring is easily cold and shrinks, resulting in incomplete gap filling and reduced sealing performance. The two sides of the ball 3 are movably installed in the limiting ring 8, and pass through the limiting ring 8 to contact the No. 1 sealing ring 9, so as to seal the ball 3. A positioning rod 11 is provided on the metal positioning ring 12 and inserted into the No. 1 sealing ring 9, so that the No. 1 sealing ring 9 is positioned at the side position of the limiting ring 8. In the space formed by the valve body 1 and the connecting seat 2, the side position of the limiting ring 8 is filled through the metal positioning ring 12 and the No. 1 sealing ring 9, so that the No. 1 sealing ring 9 is positioned at the side position of the limiting ring 8 and is not easy to move, thereby sealing the ball 3. To maintain a better sealing effect, when the valve stem 13 rotates, the movable metal block 17 moves downward on the valve stem 13 through the screw hole, the guide rod 20 passes upward in the guide hole 22, the spring 21 is compressed, and the T-shaped silicone ring 16 is squeezed by the movable metal block 17, so that the T-shaped silicone ring 16 is deformed downward, so that the T-shaped silicone ring 16 is more in contact with the inner wall of the valve body 1, thereby enhancing the sealing ability of the valve body 1; when the valve stem 13 is reset, the valve stem 13 rotates in the opposite direction, the movable metal block 17 is reset upward, the spring 21 resumes to open, and the movable metal block 17 is bonded to the T-shaped silicone ring 16, thereby resetting the T-shaped silicone ring 16 to avoid long-term squeezing of the T-shaped silicone ring 16, which causes the T-shaped silicone ring 16 to be completely deformed.

[0022] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. It is only a preferred embodiment of the utility model, and its description is more specific and detailed, but it cannot be understood as limiting the scope of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The embodiments can be changed, modified, replaced and deformed without departing from the principle and purpose of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A cryogenic ball valve with good sealing performance, comprising a valve body (1), a ball (3) movably mounted in the valve body (1), a valve stem (13) fixedly connected to the upper part of the ball (3), a lower bearing (23) movably mounted to the lower part of the ball (3), a No. 3 sealing ring (24) fixedly connected to the ball (3) between the lower bearing (23) and the ball (3), characterized in that: The valve body (1) is fixedly connected to a connecting seat (2) at the left and right sides thereof; the valve body (1) is fixedly connected to a limiting ring (8) at the two sides thereof located on the sphere (3); the limiting ring (8) is fixedly connected to the side of the limiting ring (8); the first sealing ring (9) is fixedly connected to the side of the first sealing ring (9); a metal positioning ring (12) is fixedly connected to the side of the first sealing ring (9); an upper bearing (14) is movably mounted on the valve stem (13); a second sealing ring (15) is fixedly connected to the valve stem (13) at a position above the upper bearing (14); a T-shaped silicone ring (16) is movably mounted on the valve stem (13) at a position above the second sealing ring (15); a movable metal block (17) is movably mounted on the valve stem (13) at a position above the T-shaped silicone ring (16); connecting plates (19) are fixedly connected to the two sides of the upper portion of the valve body (1); and a guide rod (20) is fixedly connected to the connecting plate (19).

2. A cryogenic ball valve with good sealing performance according to claim 1, characterized in that: One end of the connection seat (2) is fixedly connected to a No. 1 flange (4), the other end of the connection seat (2) is fixedly connected to a No. 2 flange (5), and both sides of the valve body (1) are also fixedly connected to the No. 2 flange (5). The connection seat (2) and the No. 2 flange (5) of the valve body (1) are fixedly connected via connecting bolts (6) and connecting nuts (7).

3. A cryogenic ball valve with good sealing performance according to claim 2, characterized in that: The first sealing ring (9) is provided with a positioning hole (10), and the positioning hole (10) does not penetrate the first sealing ring (9).

4. A cryogenic ball valve with good sealing performance according to claim 3, characterized in that: A positioning rod (11) is fixedly connected to the side of the metal positioning ring (12), and the positioning rod (11) is movably mounted in the positioning hole (10) of the No. 1 sealing ring (9). The No. 1 sealing ring (9) and the metal positioning ring (12) are movably mounted in the valve body (1) and the connecting seat (2).

5. A cryogenic ball valve with good sealing performance according to claim 4, characterized in that: A screw hole is provided at the center of the movable metal block (17), and the movable metal block (17) is movably mounted on the valve stem (13) through the screw hole. The upper portion of the valve stem (13) is also engraved with a thread. Connecting grooves (18) are provided at both sides of the movable metal block (17). Guide holes (22) are also provided at both sides of the movable metal block (17), and the guide holes (22) are fixedly connected to the connecting grooves (18).

6. A cryogenic ball valve with good sealing performance according to claim 5, characterized in that: The connecting plate (19) and the guide rod (20) are movably mounted in the connecting groove (18); a spring (21) is movably mounted on the guide rod (20); the spring (21) is located above the connecting plate (19) and in the connecting groove (18).

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