All-welded ball valve

Abstract

According to the technical scheme, the all-welded ball valve is characterized in that the all-welded ball valve comprises a ball core, valve seats located on the two sides of the ball core, a flow channel barrel used for locating the valve seats and allowing media to circulate, and a spring located between the valve seats and the flow channel barrel; the valve body is used for welding the two flow channel cylinders together, the valve rod penetrates through the valve body and drives the ball core to rotate, the driving piece is used for driving the valve rod to rotate, an annular groove coaxial with the valve rod is formed in the outer wall of the ball core, and anti-falling rods with one ends capable of being inserted into the annular groove and providing dragging force for the ball core are arranged on the opposite end faces of the two flow channel cylinders. And one ends of the two anti-falling rods are inserted into the annular groove, so that the position of the ball core in the vertical direction is fixed, and the problem of poor sealing performance in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, and more specifically, to a fully welded ball valve. Background Art

[0002] At present, standard-diameter welded ball valves have been widely used in various fields. Their superior quality and high-performance stability are unattainable by ordinary cast steel ball valves. The service life of fully welded ball valves is much longer than that of cast steel ball valves. Fully welded ball valves are widely used in various pipeline equipment such as urban gas, urban heating, petrochemical industry, shipbuilding, steel, pressure regulating stations, and power plants.

[0003] As Figure 1 shown, the existing fully welded ball valve includes a ball core, valve seats positioned on both sides of the ball core, a flow channel cylinder for fixing the valve seats and allowing the medium to flow through, a valve body for welding the two flow channel cylinders together, a valve stem passing through the valve body and driving the ball core to rotate, and a driving member for driving the valve stem to rotate. During the assembly process, the ball core is connected to one end of the valve stem and is located inside the valve body. The two flow channel cylinders with valve seats are moved towards each other and clamp the ball core. Finally, the valve seats are welded to the flow channel cylinders. Since the two valve seats jointly clamp the ball core, it will result in a large static friction force between the ball core and the valve seats and cause the phenomenon of seizure. To solve this problem, springs are often added between the valve seats and the flow channel cylinders in the prior art, thus solving the seizure phenomenon between the valve seats and the ball core and facilitating the rotation of the ball core. However, there are still defects. Compared with conventional ball valves, the prior art only uses one valve stem, and the lower part of the ball core is in a suspended state. During the assembly process, the ball core will move downward under the action of gravity. The part below the center of the ball core will push the two valve seats away from each other and the springs will be compressed. The part above the center of the ball core will have a gap with the valve seats. In this way, even if the valve stem is externally connected to a driving member later, the ball valve cannot be completely closed and there will be a leakage phenomenon. At the same time, during long-term use, the connection structure between the valve stem and the ball core or the connection structure between the valve stem and the driving member will age, which will also cause the ball core to move downward under the action of gravity, resulting in a gap between the ball core and the valve seats and leakage. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a fully welded ball valve with a stable position of the ball core and good sealing performance between the ball core and the valve seats.

[0005] To achieve the above object, the present utility model provides the following technical solutions: a fully welded ball valve, including a ball core, valve seats positioned on both sides of the ball core, a flow channel cylinder for positioning the valve seats and allowing the medium to flow through, a spring located between the valve seats and the flow channel cylinder, a valve body for welding the two flow channel cylinders together, a valve stem passing through the valve body and driving the ball core to rotate, and a driving member for driving the valve stem to rotate. An annular groove coaxial with the valve stem is provided on the outer wall of the ball core. Anti-falling rods capable of inserting one end into the annular groove and providing a pulling force to the ball core are provided on the opposite end faces of the two flow channel cylinders. The position of the ball core in the vertical direction is fixed by inserting one end of each of the two anti-falling rods into the annular groove.

[0006] As a further improvement of the present utility model, a number of hemispheres are provided on the surfaces of the two anti-falling rods for holding the ball core.

[0007] As a further improvement of the present utility model, rib plates located outside the annular groove are provided on the surfaces of the two anti-falling rods away from the hemispheres.

[0008] As a further improvement of the present utility model, the opposite ends of the two anti-falling rods are rounded.

[0009] The beneficial effects of the present utility model: The position of the ball core in the vertical direction is fixed by inserting one end of each of the two anti-falling rods into the annular groove. Such a design can generate a pulling force on the ball core through the anti-falling rods and limit the ball core in the vertical plane, avoiding the situation where the valve seats move away from each other due to the downward movement of the ball core under the action of gravity, ensuring full contact between the valve seats and the outer surface of the ball core, and indirectly improving the sealing performance. At the same time, the anti-falling rods applying a supporting force to the ball core can help the valve stem or the driving member share the gravity of the ball core, thereby slowing down the aging speed of the connection structure between the valve stem and the ball core and the connection structure between the driving member and the valve stem, and extending the service life of the present utility model. Description of the Drawings

[0010] Figure 1 is a structural schematic diagram of the prior art;

[0011] Figure 2 is a structural schematic diagram of the present utility model;

[0012] Figure 3 is Figure 2 the enlarged view of part A in

[0013] Figure 4 is the three-dimensional view of the flow cylinder in the present utility model.

[0014] Reference numerals: 1, ball core; 2, valve seat; 3, flow channel cylinder; 4, spring; 5, valve body; 6, valve stem; 7, driving member; 8, annular groove; 9, anti-falling rod; 10, hemisphere; 11, rib plate. Detailed Embodiment

[0015] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. Among them, the same components are denoted by the same reference numerals.

[0016] Referring to Figures 1 to 4 As shown, a fully welded ball valve in this embodiment includes a ball core 1, valve seats 2 positioned on both sides of the ball core 1, a flow channel cylinder 3 for positioning the valve seats 2 and allowing the medium to flow through, a spring 4 located between the valve seats 2 and the flow channel cylinder 3, a valve body 5 that welds the two flow channel cylinders 3 together, a valve stem 6 that penetrates the valve body 5 and drives the ball core 1 to rotate, and a driving member 7 for driving the valve stem 6 to rotate.

[0017] Based on the aforementioned prior art, an annular groove 8 coaxial with the valve stem 6 is formed on the outer wall of the ball core 1. On the end faces of the two flow channel cylinders 3 facing each other, anti-falling rods 9 are integrally formed at one end, which can be inserted into the annular groove 8 and provide a pulling force to the ball core 1. The height of the annular groove 8 in the vertical direction is greater than the thickness of the anti-falling rod 9. During the assembly process, the ball core 1 is placed in the inner cavity of the valve body 5 and externally connected to the valve stem 6. Subsequently, the flow channel cylinders 3 equipped with the valve seats 2 and the spring 4 are inserted into the valve body 5 facing each other. As the valve seat 2 approaches the ball core 1, the anti-falling rods 9 at the ends of the flow channel cylinders 3 first insert into the annular groove 8 and generate a pulling force on the ball core 1 until the valve seat 2 is in contact with the ball core 1 in place. Then, the valve body 5 is welded to the flow channel cylinder 3 and the valve stem 6 is externally connected to the driving member 7. Further, when the valve seat 2 is in contact with the ball core 1 in place and the spring 4 is deformed in place, the end of the anti-falling rod 9 entering the annular groove 8 does not touch the inner wall of the annular groove 8. In this way, it can avoid the phenomenon that the anti-falling rod 9 applies a horizontal force to the ball core 1 and causes the valve stem 6 to bend.

[0018] Such a design can generate a pulling force on the ball core 1 through the anti-falling rod 9 and limit the ball core 1 in the vertical plane, avoiding the situation where the valve seats 2 are forced to move away from each other due to the downward movement of the ball core 1 under the action of gravity, ensuring that the valve seats 2 are fully attached to the outer surface of the ball core 1, and indirectly improving the sealing performance. At the same time, the anti-falling rod 9 applying a supporting force to the ball core 1 can help the valve stem 6 or the driving member 7 share the gravity of the ball core 1, thereby slowing down the aging speed of the connection structure between the valve stem 6 and the ball core 1 and the connection structure between the driving member 7 and the valve stem 6, and extending the service life of the present utility model.

[0019] As a specific improvement embodiment, referring to Figure 3 and Figure 4 As shown, a number of hemispheres 10 are provided on the surfaces of the two anti-falling rods 9 for holding the ball core 1. The number of hemispheres 10 protrude relative to the surface of the anti-falling rod 9 and can touch the groove wall of the annular groove 8. Such a design can reduce the contact area between the anti-falling rod 9 and the annular groove 8, thereby reducing the friction force generated by the anti-falling rod 9 on the ball core 1, facilitating the rotation of the ball core 1, and at the same time slowing down the wear between the ball core 1 and the anti-falling rod 9, and indirectly ensuring the stable structural strength of the anti-falling rod 9.

[0020] As a specific implementation of the improvement, refer to Figure 3 and Figure 4 As shown, on the surfaces of the two anti-falling rods 9 away from the hemispheres 10, rib plates 11 located outside the annular groove 8 are provided. The design of the rib plates 11 can improve the structural strength and bending resistance of the anti-falling rods 9, thereby ensuring the stable position of the ball core 1.

[0021] As a specific implementation of the improvement, refer to Figure 3 and Figure 4 As shown, the opposite ends of the two anti-falling rods 9 are rounded. Such a design can facilitate the insertion of the anti-falling rods 9 into the annular groove 8 and improve the assembly efficiency.

[0022] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A fully welded ball valve, comprising a ball core (1), valve seats (2) positioned on both sides of the ball core (1), a flow channel cylinder (3) for positioning the valve seats (2) and allowing the medium to flow through, a spring (4) located between the valve seats (2) and the flow channel cylinder (3), a valve body (5) that welds the two flow channel cylinders (3) together, a valve stem (6) that penetrates the valve body (5) and drives the ball core (1) to rotate, and a driving member (7) for driving the valve stem (6) to rotate, characterized in that: An annular groove (8) coaxial with the valve stem (6) is provided on the outer wall of the ball core (1). Anti-falling rods (9) capable of inserting one end into the annular groove (8) and providing a pulling force to the ball core (1) are provided on the end faces of the two flow channel cylinders (3) facing each other. By inserting one end of each of the two anti-falling rods (9) into the annular groove (8), the position of the ball core (1) in the vertical direction is fixed.

2. The all-welded ball valve according to claim 1, characterized in that: A number of hemispheres (10) are provided on the surfaces of the two anti-falling rods (9) for holding the ball core (1).

3. The full-welded ball valve according to claim 2, characterized in that: Reinforcing ribs (11) located outside the annular groove (8) are provided on the surfaces of the two anti-falling rods (9) away from the hemispheres (10).

4. A fully welded ball valve according to claim 1 or 2 or 3, characterized in that: The opposite ends of the two anti-falling rods (9) are rounded.

Images