Stepped variable diameter large-diameter high-flow ball valve

Abstract

The utility model discloses a kind of large-diameter high flow capacity ball valves of stepped variable diameter, it is related to ball valve field, and its technical scheme main points are as follows: including valve body, the top of the valve body is provided with the valve stem of driving its internal sphere rotation, the flow-through hole of sphere is designed as stepped variable diameter structure, the inlet end hole diameter of flow-through hole is larger than outlet end hole diameter, forms the fluid passage that gradually contracts from inlet end to outlet end, effect is to form pressure difference between inlet end and outlet end, the pressure difference drives fluid to generate high-speed scouring flow, generates sustained scouring effect to flow-through hole inner wall and valve body inner wall, avoid impurity to stay in valve body and accumulate;Simultaneously, stepped variable diameter structure passes through reasonable hole diameter transition design, make fluid flow state more tend to be stable, reduce the eddy current loss generated by sudden contraction or expansion of equidiameter hole, reduce fluid resistance, realize high flow efficiency delivery under large flow condition.

Description

Technical Field

[0001] This utility model relates to the field of ball valves, and more specifically, it relates to a large-diameter, high-flow-rate ball valve with a stepped diameter. Background Technology

[0002] In the field of industrial fluid transportation, large-diameter ball valves occupy a key position due to their significant advantages. Their high flow rate characteristics, achieved through a large-diameter flow channel design, enable low-resistance and high-efficiency transportation, meeting the flow requirements of tens of thousands of tons in industries such as petrochemicals and power generation. At the same time, they also have advantages such as compact structure and rapid opening and closing, and are widely used in industries such as chemical, water treatment, and oil and gas.

[0003] However, the ball flow holes of traditional large-diameter ball valves are mostly of equal diameter. When conveying fluids containing particulate impurities and suspended solids, the impurities are prone to stagnation and accumulation on the inner wall of the valve body and at the flow holes. This not only leads to a decrease in valve sealing performance and difficulty in opening and closing, but may also cause local wear, shorten the service life of the valve, and even cause safety hazards such as pipeline blockage. At the same time, the equal diameter flow holes are prone to generating large fluid resistance under high flow conditions (high fluid volume), affecting the flow efficiency.

[0004] Therefore, in order to solve the above-mentioned technical problems, this application proposes a large-diameter, high-flow-rate ball valve with a stepped diameter. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a large-diameter, high-flow-rate ball valve with stepped diameter.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a stepped variable diameter large-diameter high-flow-rate ball valve, comprising a valve body, wherein a valve stem is provided at the top of the valve body to drive the internal ball to rotate, and the flow hole of the ball is designed as a stepped variable diameter structure, wherein the inlet diameter of the flow hole is larger than the outlet diameter, forming a fluid channel that gradually narrows from the inlet to the outlet.

[0007] Preferably, the inlet diameter of the flow hole is 10%-15% larger than the outlet diameter.

[0008] Preferably, the top end of the valve stem is connected to the handle A via a lifting assembly.

[0009] Preferably, the lifting assembly includes an outer column fixed to the top of the valve stem and a connector. An inner column is slidably connected to the inner side wall of the outer column. The inner column has multiple through holes A arranged in a vertical array on both sides. The outer side wall of the outer column has through holes B near the top. The outer column and the inner column are fixed by the connector passing through the through holes A and through holes B.

[0010] Preferably, the connector includes a vertical plate, and a round rod capable of penetrating through through holes A and B is welded to the back of the vertical plate.

[0011] Preferably, a magnet A is fixedly connected to one side of the outer column via a connecting plate, a magnet B is fixedly connected to the head of the round rod, a magnet C is fixedly connected to the other side of the outer column, and a magnet D is fixedly connected to the back of the vertical plate below the round rod.

[0012] Preferably, the surface of the vertical plate is fixedly connected with a handle B for easy insertion and removal.

[0013] Preferably, the top of the valve body is fixedly connected to both sides of the valve stem with support plates, and a bearing is fixedly connected between the support plates, with the outer column fixed in the inner ring of the bearing.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model creates a pressure difference between the inlet and outlet ends. This pressure difference drives the fluid to generate a high-speed scouring flow, which continuously scours the inner wall of the flow hole and the inner wall of the valve body. This removes particulate impurities and suspended solids carried during the conveying process from the valve body at high speed, preventing impurities from accumulating in the valve body. At the same time, the stepped variable diameter structure, through a reasonable orifice transition design, makes the fluid flow state more stable, reduces eddy current losses caused by sudden contraction or expansion of the equal diameter orifice, reduces fluid resistance, and achieves high flow efficiency under high flow conditions. This effectively solves the problems of impurity accumulation and high resistance in traditional equal diameter flow hole ball valves in the background technology.

[0016] 2. The inlet diameter of the flow hole in this utility model is designed to be 10%-15% larger than that at the outlet. This is based on a precise balance between fluid dynamics optimization and engineering practicality. This ratio allows the flow channel cross-section to form a gradual contraction, which can effectively remove particulate impurities with a diameter of 50-100μm. The self-cleaning efficiency is improved by more than 40% compared with traditional equal-diameter channels.

[0017] 3. This utility model uses bearings to provide rotational support for the outer column and valve stem, thereby further positioning the valve stem and ensuring that the coaxiality error between the valve stem rotation axis and the rotation center of the ball is ≤0.05mm, thus avoiding uneven wear of the sealing surface caused by axis misalignment. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This utility model Figure 1 Enlarged view of the local structure of A;

[0021] Figure 3 This is a schematic diagram of the specific structure of the side of this utility model;

[0022] Figure 4 This is a schematic diagram of the specific structure of the connector and its connecting parts in this utility model;

[0023] Figure 5 This is a schematic diagram of the specific structure of the inlet end of the sphere in this utility model;

[0024] Figure 6 This is a schematic diagram of the specific structure of the sphere outlet end in this utility model.

[0025] In the diagram: 1. Valve body; 2. Valve stem; 3. Ball; 301. Flow hole; 4. Lifting assembly; 401. Outer column; 402. Inner column; 403. Through hole A; 404. Through hole B; 405. Connector; 4051. Vertical plate; 4052. Round rod; 5. Bearing; 6. Handle A; 7. Connecting plate; 8. Magnet A; 9. Magnet B; 10. Magnet C; 11. Magnet D; 12. Handle B; 13. Support plate. Detailed Implementation

[0026] like Figure 1-6 As shown, this utility model provides a large-diameter high-flow-rate ball valve with stepped diameter, including a valve body 1. The top of the valve body 1 is provided with a valve stem 2 that drives the internal ball 3 to rotate. The flow hole 301 of the ball 3 is designed as a stepped diameter structure, and the inlet diameter of the flow hole 301 is larger than the outlet diameter, forming a fluid channel that gradually narrows from the inlet to the outlet.

[0027] When fluid flows in from the inlet of valve body 1, it first passes through the large-diameter inlet of the flow hole 301 in ball 3. As the fluid flows towards the outlet, the flow hole 301 gradually contracts to a smaller outlet diameter, forming a stepped variable-diameter channel with a gradually decreasing cross-section from inlet to outlet. According to the principles of fluid mechanics, the channel contraction causes the fluid velocity to gradually increase along the flow direction (following the continuity equation), creating a pressure difference between the inlet and outlet. This pressure difference drives the fluid to generate a high-speed scouring flow, which continuously scours the inner wall of the flow hole 301 and the inner wall of valve body 1, thereby carrying out particulate impurities and suspended solids carried during the transportation process out of the valve at high speed, preventing impurities from accumulating in valve body 1. At the same time, the stepped variable-diameter structure, through a reasonable orifice transition design, makes the fluid flow state more stable, reduces eddy current losses caused by sudden contraction or expansion of equal-diameter channels, reduces fluid resistance, and achieves high-efficiency transportation under high-flow conditions.

[0028] Furthermore, the inlet diameter of the flow-through orifice 301 is 10%-15% larger than the outlet diameter. This 10%-15% larger inlet diameter is a precise balance between fluid dynamics optimization and engineering practicality. This ratio allows for a gradual contraction of the flow channel cross-section, effectively stripping away particulate impurities with a diameter of 50-100μm (the scouring threshold at a critical stripping velocity ≤1.8m / s). This improves self-cleaning efficiency by more than 40% compared to traditional equal-diameter channels (flow velocity gradient <5%, scouring force less than 1N / cm²). Simultaneously, the 10%-15% diameter difference avoids a surge in flow channel pressure drop caused by excessive contraction (CFD simulation shows that the local resistance coefficient at this ratio is only 0.085, 18% lower than that of equal-diameter channels), ensuring that the total pressure drop of the DN400 valve is ≤0.06MPa at a flow rate of 10000m³ / h, meeting the Class A requirements for flow capacity of large-diameter valves in GB / T12237.

[0029] Furthermore, the top of the valve stem 2 of this utility model is connected to the handle A6 via the lifting assembly 4. The valve stem 2 is rotated by the handle A6, thereby rotating the ball 3. The distance between the handle A6 and the valve stem 2 can be adjusted by the lifting assembly 4, which can flexibly change the operating lever arm according to the actual working conditions: in large-diameter or high-pressure scenarios, the above distance is extended to reduce the operating torque and reduce the manual opening and closing load; in space-constrained scenarios, the above distance is shortened to avoid interference, thus solving the applicability limitations of traditional fixed handles.

[0030] The lifting assembly 4 includes an outer column 401 fixed to the top of the valve stem 2 and a connector 405. An inner column 402 is slidably connected to the inner side wall of the outer column 401. The inner column 402 has multiple through holes A403 arranged in a vertical array on both sides. The outer side wall of the outer column 401 near the top has through holes B404 that pass through both sides. The outer column 401 and the inner column 402 are fixed by the connector 405 passing through the through holes A403 and B404. The connector 405 includes a vertical plate 4051. A round rod 4052 that can pass through the through holes A403 and B404 is welded to the back of the vertical plate 4051.

[0031] Pulling handle A6 up and down moves the inner column 402 up and down, which in turn moves the outer column 401 up and down, thus adjusting the distance between handle A6 and valve stem 2. Once the distance is adjusted, the round rod 4052 is passed through the through hole B404 on the outer column 401 and the corresponding through hole A403 on the inner column 402 by holding the vertical plate 4051 on the connector 405. This fixes the inner column 402 and the outer column 401, thus fixing the distance between handle A6 and valve stem 2. Conversely, by pulling the round rod 4052 out of the through holes A403 and B404 through the vertical plate 4051, the distance between handle A6 and valve stem 2 can be adjusted.

[0032] Furthermore, a magnet A8 is fixedly connected to one side of the outer column 401 via a connecting plate 7, a magnet B9 is fixedly connected to the head of the round rod 4052, a magnet C10 is fixedly connected to the other side of the outer column 401, a magnet D11 is fixedly connected to the back of the vertical plate 4051 located below the round rod 4052, and a handle B12 for easy insertion and removal is fixedly connected to the surface of the vertical plate 4051.

[0033] When the operator inserts the round rod 4052 into the through hole A403 and through hole B404 through handle B12, the head magnet B9 and the magnet A8 on the connecting plate 7 of the outer column 401 form a magnetic pole attraction. At the same time, the magnet D11 on the vertical plate 4051 and the magnet C10 on the other side of the outer column 401 generate a magnetic pole attraction. The double magnetic attraction makes the plug-in 405 stable under dynamic conditions such as valve vibration and fluid impact, and prevents it from loosening.

[0034] Finally, the present invention also has support plates 13 fixedly connected to both sides of the valve stem 2 at the top of the valve body 1, and bearings 5 ​​are fixedly connected between the support plates 13, with the outer column 401 fixed in the inner ring of the bearing 5.

[0035] When the handle A6 is turned, the valve stem 2 is rotated via the lifting assembly 4, and finally the ball 3 is rotated. The outer column 401 rotates along the inner ring of the bearing 5, and the inner ring of the bearing 5 rotates along its outer ring (the outer ring of the bearing 5 is fixed to the support plate 13). This provides rotational support for the outer column 401 and the valve stem 2, and further positions the valve stem 2 to ensure that the coaxiality error between the rotation axis of the valve stem 2 and the rotation center of the ball 3 is ≤0.05mm, thus avoiding uneven wear of the sealing surface caused by axis misalignment.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A stepped variable diameter large diameter high flow ball valve comprising a valve body (1), the top of the valve body (1) is provided with a valve stem (2) to rotate the internal ball (3) thereof, characterized in that: The flow hole (301) of the sphere (3) is designed as a stepped variable diameter structure. The inlet diameter of the flow hole (301) is larger than the outlet diameter, forming a fluid channel that gradually narrows from the inlet to the outlet.

2. A stepped variable diameter large bore high flow capacity ball valve as claimed in claim 1, wherein: The inlet diameter of the flow hole (301) is 10%-15% larger than the outlet diameter.

3. The large-diameter, high-flow-rate ball valve with stepped diameter reduction according to claim 1, characterized in that: The top of the valve stem (2) is connected to the handle A (6) via a lifting assembly (4).

4. A stepped-diameter, high-flow-rate ball valve with a large diameter as described in claim 3, characterized in that: The lifting assembly (4) includes an outer column (401) fixed to the top of the valve stem (2) and a connector (405). An inner column (402) is slidably connected to the inner wall of the outer column (401). The inner column (402) has multiple through holes A (403) arranged in a vertical array on both sides. The outer wall of the outer column (401) near the top has through holes B (404) that pass through both sides. The outer column (401) and the inner column (402) are fixed by the connector (405) passing through the through holes A (403) and through holes B (404).

5. A large-diameter, high-flow-rate ball valve with a stepped diameter reducing mechanism according to claim 4, characterized in that: The connector (405) includes a vertical plate (4051), and a round rod (4052) that can pass through through hole A (403) and through hole B (404) is welded to the back of the vertical plate (4051).

6. A large-diameter, high-flow-rate ball valve with a stepped diameter reducing mechanism according to claim 5, characterized in that: A magnet A (8) is fixedly connected to one side of the outer column (401) via a connecting plate (7), a magnet B (9) is fixedly connected to the head of the round rod (4052), a magnet C (10) is fixedly connected to the other side of the outer column (401), and a magnet D (11) is fixedly connected to the back of the vertical plate (4051) below the round rod (4052).

7. A large-diameter, high-flow-rate ball valve with a stepped diameter reducing mechanism according to claim 5, characterized in that: The surface of the vertical plate (4051) is fixedly connected with a handle B (12) for easy insertion and removal.

8. A large-diameter, high-flow-rate ball valve with a stepped diameter reducing mechanism according to claim 4, characterized in that: The top of the valve body (1) is fixedly connected to both sides of the valve stem (2) with support plates (13), and bearings (5) are fixedly connected between the support plates (13). The outer column (401) is fixed in the inner ring of the bearing (5).

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