Ball valve capable of releasing pressure in advance

Abstract

According to the technical scheme, the ball valve is characterized in that the ball valve comprises a valve body, a ball body, two valve seats and a valve rod, the ball body is provided with a rod groove allowing one end of the valve rod to be inserted therein, and the ball body is provided with two drainage holes which are inclined relative to the horizontal plane and communicated with the rod groove; the plane where the two drainage holes are located is perpendicular to the axis of an inner cavity, allowing media to pass, of the ball, and orifices, located in the surface of the ball, of the two drainage holes can communicate with channels, located on the two sides of the ball, of the valve body correspondingly. The connecting end can be partially inserted into the rod groove and is rotationally connected with the ball body, the rod body is coaxially connected with the connecting end, one end of the rod body penetrates out of the valve body, the connecting end is provided with a drainage channel which extends in the radial direction of the connecting end and can communicate with the two drainage holes, and a stress block is arranged at the groove bottom of the rod groove; an arc-shaped groove which is used for containing the stress block and is coaxial with the connecting end is formed in the end face, facing the rod groove, of the connecting end. The problems that in the prior art, opening is difficult, and sealing faces of the valve seat and the ball body are prone to abrasion are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, and more particularly to a ball valve capable of pre-relieving pressure. Background Art

[0002] A ball valve is a valve in which the ball is driven by the valve stem and rotates around the axis of the ball. It can be used for fluid regulation and control. A ball valve should generally be installed horizontally in a pipeline. When the ball valve is in a closed state, one side of the ball is pushed by the medium, causing the other side of the ball to fit tightly against the valve seat. The static friction between the ball and the valve seat increases, and the driving force required to open the ball valve increases, which will increase the difficulty of opening the ball valve. At the same time, it will also aggravate the wear between the ball surface and the valve seat, causing a sharp drop in the sealing effect between the ball and the valve seat, leading to leakage; furthermore, severe wear of the valve seat on one side of the ball will aggravate the degree of bending deformation of the valve stem driven by the ball, thereby further affecting the transmission efficiency between the valve stem and the ball, and ultimately affecting the opening and closing speed of the ball valve. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model aims to provide a ball valve which can slow down the wear of the ball and the valve seat, ensure the stability of the valve stem structure and is easy to open.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a ball valve capable of pre-relieving pressure, comprising a valve body, a ball limited in the valve body, two valve seats positioned in the valve body and respectively located on both sides of the ball, and a valve stem capable of driving the ball to rotate, the ball being provided with a rod groove for inserting one end of the valve stem, the ball being provided with two leakage holes inclined relative to a horizontal plane and connected to the rod groove, the planes where the two leakage holes are located being perpendicular to the axis of the inner cavity of the ball for medium to pass through, the orifices of the two leakage holes located on the surface of the ball being able to respectively connect with the valve The valve stem is connected to channels located on both sides of the spherical body, and the valve stem includes a connecting end that can be partially inserted into the rod groove and rotatably connected to the spherical body, and a rod body that is coaxially connected to the connecting end and one end of which passes through the valve body, and the connecting end is provided with a leakage channel that extends radially along the connecting end and can be connected to the two leakage holes, a force block is provided on the groove bottom of the rod groove, and an arc groove that is coaxial with the connecting end and is used to accommodate the force block is provided on the end surface of the connecting end facing the rod groove, and the force block is moved to one end of the arc groove by rotating the connecting end relative to the rod groove, and the leakage channel connects the two leakage holes.

[0005] As a further improvement of the utility model, the openings of the two leakage holes located on the inner wall of the rod groove are both provided with sealing rings which are coaxial with the corresponding openings and fit with the outer wall of the connecting end.

[0006] As a further improvement of the utility model, a sealing ring capable of fitting with the inner wall of the rod groove is sleeved on the outer wall of the connecting end, and the distance between the sealing ring and the end face of the connecting end is greater than the distance between the leakage channel and the end face of the connecting end.

[0007] As a further improvement of the present invention, the number of the arc-shaped grooves is two and they are centrally symmetrically arranged, and the number of the force-bearing blocks is two and they are respectively located in the two arc-shaped grooves.

[0008] As a further improvement of the present invention, soft stress-bearing layers are provided at both ends of at least one of the arc-shaped grooves.

[0009] The beneficial effects of the utility model are as follows: the force block is moved to one end of the arc groove by rotating the connecting end relative to the rod groove and the leakage channel connects the two leakage holes. The medium on one side of the sphere flows through the leakage hole, the leakage channel and the other leakage hole in turn to reach the other side of the sphere. Compared with the prior art, such a design can release pressure in advance when opening, thereby reducing the friction between the ball and the valve seat, improving the efficiency of opening the ball, and at the same time slowing down the wear between the ball and the valve seat, ensuring the structural stability of the sealing surfaces of the ball and the valve seat, thereby further slowing down the degree of local bending of the valve stem caused by wear, and indirectly improving the structural stability of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model when it is in a circuit-breaking state and the leakage channel is not connected with the leakage hole;

[0011] Figure 2 It is a structural schematic diagram of the utility model when it is in a circuit-breaking state and the leakage channel is connected with the leakage hole;

[0012] Figure 3 It is a structural schematic diagram of the utility model when it is in a passage state and the leakage channel is connected with the leakage hole;

[0013] Figure 4 for Figure 1 The enlarged view of point A in the middle;

[0014] Figure 5 for Figure 2 The enlarged view of point B in the middle;

[0015] Figure 6 for Figure 3 Enlarged view of point C in the middle;

[0016] Figure 7 for Figure 4 Cross-sectional view at DD in the middle;

[0017] Figure 8 for Figure 5 Cross-section at EE;

[0018] Fig. 9 for Figure 6 Cross-sectional view at FF.

[0019] Figure numerals: 1, valve body; 2, sphere; 21, rod groove; 22, leakage hole; 23, force block; 24, sealing ring; 3, valve seat; 4, valve stem; 41, connecting end; 42, rod body; 43, leakage channel; 44, arc groove; 45, sealing ring; 46, force layer. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.

[0021] Reference Figures 1 to 9 As shown, a ball valve capable of pre-relieving pressure in this embodiment comprises a valve body 1, a ball 2 limited in the valve body 1, two valve seats 3 positioned in the valve body 1 and respectively located on both sides of the ball 2, and a valve stem 4 capable of driving the ball 2 to rotate. The ball 2 is provided with a stem groove 21 for inserting one end of the valve stem 4, and the valve body 1 is side-mounted;

[0022] Based on the above-mentioned prior art, a vertical plane perpendicular to the axis of the inner cavity of the sphere 2 is selected. If the size of the sphere 2 is small, two drainage holes 22 inclined relative to the horizontal plane are drilled inward from the surface of the sphere 2. The two drainage holes 22 are respectively located on both sides of the axis of the inner cavity of the sphere 2 and one end of each extends to the inner wall of the rod groove 21. If the size of the sphere 2 is large, the sphere 2 is cut in half based on the vertical plane, and then grooves that can be assembled with the drainage holes 22 are machined on both cut surfaces, and then the two cut surfaces are assembled and welded together;

[0023] The valve stem 4 includes a connecting end 41 and a rod body 42 which are integrally formed and coaxially arranged. The connecting end 41 is a cylinder. The inner cavity of the rod groove 21 matches the connecting end 41. An arc groove 44 is processed on the end face of the connecting end 41. The arc profile of the arc groove 44 is coaxial with the center of the end face of the connecting end 41. The arc groove 44 is arranged at the edge of the end face. The arc length of the arc groove 44 is one-fourth of a circular arc. A leakage channel 43 extending radially along the connecting end 41 and penetrating the connecting end 41 is provided on the connecting end 41. A force bearing block 23 is integrally formed at the junction of the bottom surface of the rod groove 21 and the peripheral wall. An annular groove coaxial with the connecting end 41 is also provided on the peripheral wall of the connecting end 41. A plurality of threaded holes for bolt thread connection and capable of communicating with the annular groove are provided on the sphere 2. The plurality of threads are distributed circumferentially. The distance between the annular groove and the end face of the connecting end 41 is greater than the distance between the leakage channel 43 and the end face of the connecting end 41.

[0024] During the assembly process, the ball 2 is first placed in the valve body 1, and then the valve stem 4 is inserted into the valve body 1 until the connecting end 41 is inserted into the rod groove 21 and in place. The annular groove of the connecting end 41 and the threaded hole of the ball 2 are in the same horizontal plane and are connected to each other. Multiple bolts are screwed into the threaded holes of the ball 2 one by one and one end of the multiple bolts are extended into the annular groove. Then, the connecting end 41 is limited in the rod groove 21 and can rotate relative to the rod groove 21. The opening of the drain hole 22 on the inner wall of the rod groove 21 is at the same height as the drain channel 43. The force block 23 is located in the arc groove 44. Finally, the side cover of the valve body 1 is installed, the ball 2 is limited in the valve body 1, and then the end of the valve stem 4 exposed outside the valve body 1 is connected to an external handle or a driver.

[0025] In the initial state, the ball 2 blocks the flow of the medium inside the valve body 1, the force block 23 contacts the inner wall of one end of the arc groove 44, and the two ends of the leakage channel 43 are staggered with the openings of the two leakage holes 22 located on the inner wall of the rod groove 21. The openings of the two leakage holes 22 located on the surface of the ball 2 are respectively connected with the channels of the valve body 1 located on both sides of the ball 2. During the opening process, the valve stem 4 rotates first relative to the ball 2, and the force block 23 moves along the contour direction of the arc groove 44 until the force block 23 moves to contact the other end of the arc groove 44, and the two ends of the leakage channel 43 are respectively connected with the two leakage holes 22. The medium on one side of the ball 2 flows through the leakage hole 22, the leakage channel 43 and the other leakage hole 22 in turn and flows to the other side of the ball 2. At this time, the medium on one side of the ball 2 The medium pressure drops, and the static friction between the ball 2 and the valve seat 3 on one side decreases. As the valve stem 4 continues to be driven, the force block 23 is pushed to drive the ball 2 to rotate relative to the valve seat 3 as a whole, until the valve stem 4 drives the ball 2 to rotate 90 degrees, the valve stem 4 stops rotating, and the medium is in a flowing state; in the closing process, the valve stem 4 first rotates in the opposite direction relative to the ball 2, until the force block 23 returns to the initial state and contacts the inner wall of one end of the arc groove 44, and the two ends of the leakage channel 43 are disconnected from the two leakage holes 22 respectively, so that the two leakage holes 22 cannot be connected. As the valve stem 4 continues to rotate, the force block 23 is pushed to drive the ball 2 to rotate in the opposite direction as a whole. After the valve stem 4 drives the ball 2 to rotate to the initial state, the medium fills one side of the ball 2;

[0026] Compared with the prior art, such a design can release pressure in advance when opening, thereby reducing the friction between the ball 2 and the valve seat 3, improving the opening efficiency of the ball 2, and at the same time slowing down the wear between the ball 2 and the valve seat 3, ensuring the structural stability of the sealing surfaces of the ball 2 and the valve seat 3, thereby further slowing down the degree of local bending of the valve stem 4 caused by wear, and indirectly improving the structural stability of the valve stem 4.

[0027] As a specific implementation method of the improvement, refer to Figures 4 to 6As shown, the leakage hole 22 is located on the inner wall of the rod groove 21, and a soft sealing ring 24 coaxial with the corresponding hole is fixedly adhered thereto. When the connecting end 41 rotates relative to the rod groove 21, the outer wall of the connecting end 41 slides relative to the sealing ring 24 while always fitting with the sealing ring 24. Such a design can improve the sealing between the connecting end 41 and the leakage hole 22, ensure that the medium can only flow to the other side of the ball 2 for pressure relief, reduce the medium thrust on the packing gland, and at the same time increase the tightness between the connecting end 41 and the ball 2, avoiding the phenomenon of arbitrary shaking of the ball 2 relative to the valve stem 4.

[0028] As a specific implementation method of the improvement, refer to Figures 4 to 6 As shown, a sealing ring 45 is sleeved on the outer wall of the connecting end 41 and can fit with the inner wall of the rod groove 21. The distance between the sealing ring 45 and the end face of the connecting end 41 is greater than the distance between the leakage channel 43 and the end face of the connecting end 41. The sealing ring 45 can prevent the medium overflowing to the top of the sphere 2 from entering the gap between the connecting end 41 and the rod groove 21. The combined use of the sealing ring 45 and the sealing ring 24 can ensure that the medium cannot enter between the connecting end 41 and the rod groove 21. Such a design can prevent impurities from stagnating in the gap and causing rotation difficulties, thereby ensuring the smoothness of the movement of the force block 23 in the arc groove 44.

[0029] As a specific implementation method of the improvement, refer to Figures 7 to 9 As shown, there are two arc grooves 44 which are centrally symmetrically arranged, and there are two force blocks 23 which are respectively located in two arc grooves 44. Compared with the design in which both the force block 23 and the arc groove 44 are one, such a design can increase the force points between the sphere 2 and the connecting end 41. The sphere 2 and the connecting end 41 are evenly stressed and not easily damaged, thereby extending the service life of the sphere 2 and the connecting end 41.

[0030] As a specific implementation of the improvement, there is a situation where when one of the force-bearing blocks 23 contacts one end of the corresponding arc groove 44, the other force-bearing block 23 does not contact the arc groove 44. This will still cause the connection end 41 and the ball 2 to be unevenly stressed and easily damaged. To solve the above problem, refer to Figures 7 to 9 As shown, soft stress-bearing layers 46 are provided at both ends of at least one arc groove 44. When the arc groove 44 where the stress-bearing layer 46 is located contacts the stress-bearing block 23, as the stress-bearing block 23 squeezes the stress-bearing layer 46 so that the stress-bearing layer 46 undergoes elastic deformation, another stress-bearing block 23 contacts one end of the arc groove 44 where it is located. Finally, both stress-bearing blocks 23 are driven by the force to drive the sphere 2 to rotate. This design ensures that the sphere 2 and the connecting end 41 are evenly stressed.

[0031] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A ball valve capable of pre-relieving pressure, comprising a valve body (1), a ball (2) limited in the valve body (1), two valve seats (3) positioned in the valve body (1) and respectively located on both sides of the ball (2), and a valve stem (4) capable of driving the ball (2) to rotate, wherein the ball (2) is provided with a stem groove (21) for inserting one end of the valve stem (4), and characterized in that: The sphere (2) is provided with two leakage holes (22) which are inclined relative to a horizontal plane and communicated with the rod groove (21); the planes where the two leakage holes (22) are located are perpendicular to the axis of the inner cavity of the sphere (2) for medium to pass through; the openings of the two leakage holes (22) located on the surface of the sphere (2) can be respectively communicated with the channels of the valve body (1) located on both sides of the sphere (2); the valve stem (4) comprises a connecting end (41) which can be partially inserted into the rod groove (21) and rotatably connected to the sphere (2); and a rod body (41) which is coaxially connected to the connecting end (41) and has one end extending out of the valve body (1). 42), the connecting end (41) is provided with a leakage channel (43) extending radially along the connecting end (41) and being communicated with the two leakage holes (22), a force block (23) is arranged on the groove bottom of the rod groove (21), and an arc groove (44) for accommodating the force block (23) and coaxial with the connecting end (41) is arranged on the end surface of the connecting end (41) facing the rod groove (21), and the force block (23) is moved to one end of the arc groove (44) by rotating the connecting end (41) relative to the rod groove (21), and the leakage channel (43) connects the two leakage holes (22).

2. A ball valve capable of pre-relieving pressure according to claim 1, characterized in that: The two leakage holes (22) are both provided with sealing rings (24) coaxial with the corresponding holes and in contact with the outer wall of the connection end (41) at their openings on the inner wall of the rod groove (21).

3. A ball valve capable of pre-relieving pressure according to claim 1 or 2, characterized in that: A sealing ring (45) is sleeved on the outer wall of the connecting end (41) and can fit the inner wall of the rod groove (21). The distance between the sealing ring (45) and the end surface of the connecting end (41) is greater than the distance between the leakage channel (43) and the end surface of the connecting end (41).

4. A ball valve capable of pre-relieving pressure according to claim 1 or 2, characterized in that: The number of the arc-shaped grooves (44) is two and they are centrally symmetrically arranged, and the number of the force-bearing blocks (23) is two and they are respectively located in the two arc-shaped grooves (44).

5. A ball valve capable of pre-relieving pressure according to claim 4, characterized in that: Soft stress-bearing layers (46) are provided at both ends of at least one of the arc-shaped grooves (44).

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