Global eccentric ball valve

Abstract

The invention provides a global eccentric ball valve which comprises a valve body, a connecting body, a valve ball, a first valve seat sealing ring, a second valve seat sealing ring and a valve rod, one end of the valve ball is connected with the valve rod, the valve ball comprises a first hemisphere, a second hemisphere and a cavity, the first valve seat sealing ring is arranged on the inner side wall of the valve body, and the second valve seat sealing ring is arranged on the inner side wall of the valve body. A second valve seat sealing ring is arranged on the inner side wall of the connecting body, the center line b where the center of the first hemisphere is located and the center line c where the center of the second hemisphere is located are located on the upper side and the lower side of the center line a of the valve runner respectively, the center line of the first valve seat sealing ring coincides with the center line b, and the center line of the second valve seat sealing ring coincides with the center line c. When a valve runner is completely closed, the first valve seat sealing ring is tightly attached to the first hemisphere, and the second valve seat sealing ring is tightly attached to the second hemisphere. The situation that the upper half part of the valve ball is tightly attached to the upper end face of the valve seat sealing ring, but the lower half part of the valve ball cannot be tightly attached to the lower end face of the valve seat sealing ring, or the lower half part of the valve ball is tightly attached to the lower end face of the valve seat, but the upper half part of the valve ball cannot be tightly attached to the upper end face of the valve seat sealing ring when the valve runner is in the closed position is avoided; and the sealing effect of the valve runner is fully ensured.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a global eccentric ball valve. Background Art

[0002] In pipeline fluid systems, ball valves are increasingly used due to the effects of flow resistance and flowability. The main function of a ball valve is to cut off or connect the fluid channel in a pipeline, and it is usually a closed-circuit valve. However, compared to globe valves, ball valves do not have the characteristics of forced sealing, and the ball of the ball valve is always in a friction state with the valve during the switching process, which affects the driving force.

[0003] The ball valves used in the existing industry are divided into non-eccentric ball valves and eccentric ball valves according to whether the rotation center of the ball component is eccentric. In general, in the design of ball valves, conventional ball valves are mostly non-eccentric structure ball valves, while eccentric structure ball valves are mostly hemispherical structures. Ball valves have the characteristics of small fluid resistance and large flow capacity, and can be used for fast closing conditions, but when using a hemispherical structure, the valve flow resistance will be significantly increased, and the design can only adopt a single valve seat structure. CN108167467A is a two-way sealed ball valve, the valve ball is installed in the valve body, one end of the transmission shaft is connected to the valve ball, the inlet and outlet ends of the valve body are provided with valve seats symmetrically centered on the valve ball, and the valve seat is pressed to a position sealed with the valve ball by a pressure ring; the valve ball includes two eccentric hemispheres, the flow channel hole of the valve seat is an eccentric hole, and the eccentric hemispheres on the same side are equal to the eccentric distance of the flow channel hole, and the eccentric direction is the same. This patent application has the characteristics of good sealing effect and low torque under the same flow capacity; at the same time, it reduces the wear of the valve ball and valve seat sealing surface and avoids the risk of valve ball getting stuck. Although it is a global eccentric ball valve, when the valve is fully closed, the upper part of the valve ball and the upper part of the valve seat may fit tightly, but the lower part of the valve ball and the lower part of the valve seat may not fit completely, affecting the sealing effect. Summary of the invention

[0004] In view of this, the present invention aims to provide a global eccentric ball valve for ensuring that when the valve flow channel is fully closed, the first valve seat sealing ring tightly fits the first hemisphere and the second valve seat sealing ring tightly fits the second hemisphere.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A global eccentric ball valve, comprising a valve body, a connecting body, a valve ball, a first seat sealing ring, a second seat sealing ring and a valve stem. The valve ball is arranged in a valve flow passage formed by the valve body and the connecting body. One end of the valve ball is connected to the valve stem. The valve ball includes a first hemispherical body, a second hemispherical body and a cavity. The inner side wall of the valve body is provided with the first seat sealing ring, which is located between the first hemispherical body and the valve body. The inner side wall of the connecting body is provided with the second seat sealing ring, which is located between the second hemispherical body and the connecting body. The center line b where the center of the first hemispherical body is located and the center line c where the center of the second hemispherical body is located are respectively on the upper and lower sides of the center line a of the valve flow passage. The center line of the first seat sealing ring coincides with the center line b, and the center line of the second seat sealing ring coincides with the center line c. When the valve flow passage is completely closed, the first seat sealing ring closely fits the first hemispherical body, and the second seat sealing ring closely fits the second hemispherical body, so as to avoid the situation that when the valve flow passage is in the closed position, the upper half of the valve ball closely fits the upper end face of the seat sealing ring, while the lower half of the valve ball cannot closely fit the lower end face of the seat sealing ring, or the lower half of the valve ball closely fits the lower end face of the seat, while the upper half of the valve ball cannot closely fit the upper end face of the seat sealing ring, thus fully ensuring the sealing effect of the valve flow passage.

[0007] Further, the distance between the center line b and the center line a is h1, and the distance between the center line c and the center line a is h2, and h1 and h2 are not equal. When h2 > h1, the compression amount between the second seat sealing ring and the second hemispherical body is larger. During the process from opening to closing, the valve ball will contact the second seat sealing ring earlier. At this time, the fluid medium entering from the left side of the valve flow passage will be sealed earlier, and it is not necessary to rotate the valve ball to the horizontal state to achieve the complete sealing effect. At the same time, when the valve ball moves towards the closed position, a larger compression compensation amount will be provided between the second hemispherical body and the sealing ring. When h2 < h1, the compression amount between the first seat sealing ring and the first hemispherical body is larger. During the process from opening to closing, the valve ball will contact the first seat sealing ring earlier. At this time, the fluid medium entering from the right side of the valve flow passage will be sealed earlier, and it is not necessary to rotate the valve ball to the horizontal state to achieve the complete sealing effect. At the same time, when the valve ball moves towards the closed position, a larger compression compensation amount will be provided between the first hemispherical body and the first seat sealing ring. After the seat is slightly worn, the compression compensation amount can provide a certain sealing effect and extend the service life.

[0008] Further, the first hemispherical body and the second hemispherical body are welded together, and a cavity is formed inside them for the fluid medium to flow through the cavity.

[0009] Furthermore, a first mounting groove is provided on the inner wall of the valve body, a first valve seat sealing ring is provided in the first mounting groove, a second mounting groove is provided on the inner wall of the connecting body, a second valve seat sealing ring is provided in the second mounting groove. The first mounting groove and the second mounting groove are used to position and install the first valve seat sealing ring and the second valve seat sealing ring.

[0010] Furthermore, the valve body and the connecting body are detachably connected, so that the two can be easily disassembled to clean the interior of the valve flow channel.

[0011] Furthermore, the global eccentric ball valve further comprises an adapter and a drive device, one end of the adapter is connected to the valve stem, and the other end is connected to the drive device. The drive device outputs a transmission force and transmits it to the valve stem through the adapter, so that the valve stem drives the valve ball to rotate, thereby realizing the control of the switch position.

[0012] Furthermore, a packing gland is arranged at the upper end of the spherical eccentric ball valve, the valve stem is arranged inside the packing gland, and the inside of the packing gland is filled with packing, and a packing sleeve is arranged at the upper end of the packing.

[0013] Compared with the prior art, the global eccentric ball valve of the present invention has the following advantages:

[0014] (1) The center of the first hemisphere does not coincide with the center of the second hemisphere, forming an eccentric structure. The center line of the first valve seat sealing ring coincides with the center line b, and the center line of the second valve seat sealing ring coincides with the center line c, which is used to ensure that when the valve flow channel is fully closed, the first valve seat sealing ring is tightly fitted to the first hemisphere, and the second valve seat sealing ring is tightly fitted to the second hemisphere.

[0015] (2) When the valve flow channel is gradually opened, the first hemisphere can be prevented from contacting the first valve seat sealing ring and the second hemisphere from contacting the second valve seat sealing ring during the opening process, which can not only reduce the wear of the valve ball but also effectively reduce the valve opening and closing torque during the opening process; when the valve flow channel is gradually closed, under the action of eccentricity, the first hemisphere gradually approaches the first valve seat sealing ring and presses the first valve seat sealing ring more and more tightly, and the second hemisphere gradually approaches the second valve seat sealing ring and presses the second valve seat sealing ring more and more tightly, thereby improving the sealing performance of the valve when it is closed.

[0016] (3) h1 and h2 are not equal, and there is a certain amount of compression compensation. Even if the valve seat is slightly worn, the compression compensation can provide a certain sealing effect and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of a global eccentric ball valve according to the present invention;

[0019] Figure 2 It is a structural schematic diagram of the global eccentric ball valve of the present invention when it is in a fully closed position;

[0020] Figure 3 It is a structural schematic diagram of the global eccentric ball valve of the present invention rotating counterclockwise from closed to open;

[0021] Figure 4 for Figure 3 A partial enlarged view of point A.

[0022] Description of reference numerals:

[0023] 1. Valve body; 2. Connector; 3. Valve ball; 31. First hemisphere; 32. Second hemisphere; 4. First valve seat sealing ring; 5. Second valve seat sealing ring; 6. Valve stem; 7. Packing; 8. Packing gland; 9. Packing gland; 10. Adapter; 11. Drive device; 12. Fasteners. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The embodiments described in the present invention are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] like Figure 1As shown, a global eccentric ball valve comprises a valve body 1, a connector 2, a valve ball 3, a first valve seat sealing ring 4, a second valve seat sealing ring 5 and a valve stem 6. The valve ball 3 is arranged in a valve flow channel formed by the valve body 1 and the connector 2. One end of the valve ball 3 is connected to the valve stem 6. The valve ball 3 comprises a first hemisphere 31, a second hemisphere 32 and a cavity. The inner side wall of the valve body 1 is provided with a first valve seat sealing ring 4, and the first valve seat sealing ring 4 is located between the first hemisphere 31 and the valve body 1. The inner side wall of the connector 2 is provided with a second valve seat sealing ring 5. Seat seal ring 5, the second valve seat seal ring 5 is located between the second hemisphere 32 and the connector 2, the center line b of the first hemisphere 31 and the center line c of the second hemisphere 32 are located on the upper and lower sides of the center line a of the valve flow channel respectively, the center line of the first valve seat seal ring 4 coincides with the center line b, and the center line of the second valve seat seal ring 5 coincides with the center line c, which is used to ensure that when the valve flow channel is completely closed, the first valve seat seal ring 4 is tightly fitted to the first hemisphere 31, and the second valve seat seal ring 5 is tightly fitted to the second hemisphere 32. It avoids the situation that when the valve flow channel is in the closed position, the upper half of the valve ball 3 is tightly fitted to the upper end face of the valve seat seal ring, while the lower half of the valve ball 3 cannot be tightly fitted to the lower end face of the valve seat seal ring, or the lower half of the valve ball 3 is tightly fitted to the lower end face of the valve seat, while the upper half of the valve ball 3 cannot be tightly fitted to the upper end face of the valve seat seal ring, and the sealing effect of the valve flow channel is fully guaranteed.

[0027] Through this arrangement of the present application, the center of the first hemisphere 31 and the center of the second hemisphere 32 do not coincide, forming an eccentric structure. Since the center line of the first valve seat sealing ring 4 deviates from the center line a, and the center line of the second valve seat sealing ring 5 deviates from the center line b, the first valve seat sealing ring 4 forms a valve seat sealing surface with different radii relative to the midpoint O of the valve flow channel, and the second valve seat sealing ring 5 forms a valve seat sealing surface with different radii relative to the midpoint O of the valve flow channel. The distance from the midpoint O to the upper end surface of the first valve seat sealing ring 4 is recorded as the eccentric radius H, the distance from the midpoint O to the lower end surface of the first valve seat sealing ring 4 is recorded as the eccentric radius G, the distance from the midpoint O to the upper end surface of the second valve seat sealing ring 5 is recorded as the eccentric radius E, and the distance from the midpoint O to the lower end surface of the second valve seat sealing ring 5 is recorded as the eccentric radius F. Eccentric radius G < eccentric radius H, eccentric radius E < eccentric radius F. The fluid medium flows in the valve flow channel.

[0028] like Figure 2 As shown, the global eccentric ball valve is in a fully closed state, the first valve seat sealing ring 4 is sleeved on the outside of the first hemisphere 31, the first hemisphere 31 squeezes the first valve seat sealing ring 4, the first hemisphere 31 and the first valve seat sealing ring 4 form a good seal and cut off the valve body 1. The second valve seat sealing ring 5 is sleeved on the outside of the second hemisphere 32, the second hemisphere 32 squeezes the second valve seat sealing ring 5, the second hemisphere 32 and the second valve seat sealing ring 5 form a good seal and cut off the connector 2.

[0029] like Figure 3 As shown in FIG. 1 , the valve ball 3 rotates counterclockwise under the action of the valve stem 6, gradually opening the valve flow channel. Under the eccentric action, since the eccentric radius of the first valve seat sealing ring 4 increases from the eccentric radius G to the eccentric radius H, the distance between the first hemisphere 31 and the first valve seat sealing ring 4 increases during the eccentric counterclockwise rotation process, and gradually separates from the first valve seat sealing ring 4, as shown in FIG. Figure 4 As shown, the first hemisphere 31 is prevented from contacting with the first valve seat seal ring 4 during the opening process; since the eccentric radius of the second valve seat seal ring 5 increases from the eccentric radius E to the eccentric radius F, the distance between the second hemisphere 32 and the second valve seat seal ring 5 during the eccentric counterclockwise rotation is increasing, and the second hemisphere 32 gradually separates from the second valve seat seal ring 5, avoiding the contact between the second hemisphere 32 and the second valve seat seal ring 5 during the opening process, which can not only reduce the wear of the valve ball 3 but also effectively reduce the valve opening and closing torque during the opening process. It should be noted that Figure 3 In the embodiment, there is a gap between the first hemisphere 31 and the first valve seat sealing ring 4, and there is a gap between the second hemisphere 32 and the second valve seat sealing ring 5. Figure 4 A partial enlarged view can better illustrate this.

[0030] When the valve ball 3 rotates to a vertical state, the valve flow channel is fully opened. At this time, the valve ball 3 rotates clockwise under the action of the valve stem 6, gradually closing the valve flow channel. Under the action of eccentricity, the first hemisphere 31 gradually approaches the first valve seat sealing ring 4 and presses the first valve seat sealing ring 4 more and more tightly, and the second hemisphere 32 gradually approaches the second valve seat sealing ring 5 and presses the second valve seat sealing ring 5 more and more tightly, thereby improving the sealing performance when the valve is closed.

[0031] Specifically in the present application, the center line b of the center of the first hemisphere 31 refers to the center line of the first hemisphere 31 in the horizontal direction, and the center line c of the center of the second hemisphere 32 refers to the center line of the second hemisphere 32 in the horizontal direction. The eccentric radius of the first valve seat sealing ring 4 refers to the distance from the midpoint O to the end face of the first valve seat sealing ring 4. The eccentric radius of the second valve seat sealing ring 5 refers to the distance from the midpoint O to the end face of the second valve seat sealing ring 5.

[0032] The first hemisphere 31 and the second hemisphere 32 are welded and connected, and a cavity is formed inside the two to allow the fluid medium to flow through the cavity. The valve ball 3 is rotatably arranged in the valve flow channel through the valve stem 6, so that the valve ball 3 can be driven to rotate by operating the valve stem 6 to open or close the valve flow channel. When the valve flow channel is open, the cavity and the valve flow channel are connected, and when the valve flow channel is closed, the cavity and the valve flow channel are not connected. The valve ball 3 formed by the first hemisphere 31 and the second hemisphere 32 is a global shape, which avoids the problem of large flow resistance of the hemispherical valve and relying only on a single valve seat for sealing.

[0033] As a preferred example of the present invention, the distance between the center line b and the center line a is h1, the distance between the center line c and the center line a is h2, and h1 and h2 are not equal. One of the end of the valve body 1 deviating from the connecting body 2 and the end of the connecting body 2 deviating from the valve body 1 is the inlet end, and the other is the outlet end. When h1 and h2 are not equal, when the valve ball 3 rotates counterclockwise to gradually close the valve flow passage, the extrusion degrees of the first hemispherical body 31 on the first valve seat sealing ring 4 and the second hemispherical body 32 on the second valve seat sealing ring 5 are different, so that the sealing effects of the inlet end and the outlet end are different, and it can adapt to valve bodies 1 and connecting bodies 2 with different material strengths to meet different usage requirements. In addition, when h2>h1, the compression amount between the second valve seat sealing ring 5 and the second hemispherical body 32 is larger. During the process from opening to closing, the valve ball 3 will contact the second valve seat sealing ring 5 earlier. At this time, the fluid medium entering from the left side of the valve flow passage will be sealed earlier, and it is not necessary to rotate the valve ball 3 to the horizontal state to achieve a completely sealed effect. At the same time, when the valve ball 3 moves towards the closed position, it will provide a larger compression compensation amount between the second hemispherical body 32 and the second valve seat sealing ring 5; when h2<h1, the compression amount between the first valve seat sealing ring 4 and the first hemispherical body 31 is larger. During the process from opening to closing, the valve ball 3 will contact the first valve seat sealing ring 4 earlier. At this time, the fluid medium entering from the right side of the valve flow passage will be sealed earlier, and it is not necessary to rotate the valve ball 3 to the horizontal state to achieve a completely sealed effect. At the same time, when the valve ball 3 moves towards the closed position, it will provide a larger compression compensation amount between the first hemispherical body 31 and the first valve seat sealing ring 4. Even if the valve seat is slightly worn, the compression compensation amount can provide a certain sealing effect and will not affect normal use, thus extending the service life. Here, the valve ball 3 rotating to the horizontal state means that the first hemispherical body 31 and the second hemispherical body 32 are in the horizontal state.

[0034] Further, a first installation groove is provided on the inner side wall of the valve body 1, and the first valve seat sealing ring 4 is arranged in the first installation groove. A second installation groove is provided on the inner side wall of the connecting body 2, and the second valve seat sealing ring 5 is arranged in the second installation groove. The first installation groove and the second installation groove play a role in positioning and installing the first valve seat sealing ring 4 and the second valve seat sealing ring 5.

[0035] The valve body 1 and the connecting body 2 are detachably connected, which is convenient for disassembling the two to clean the inside of the valve flow passage. Specifically in the figure of this application, the valve body 1 and the connecting body 2 are connected by a fastener 12. The fastener 12 is a bolt.

[0036] The global eccentric ball valve further includes a adapter 10 and a driving device 11. One end of the adapter 10 is connected to the valve stem 6, and the other end is connected to the driving device 11. The driving device 11 outputs a driving force and transmits it to the valve stem 6 through the adapter 10, so that the valve stem 6 drives the valve ball 3 to rotate to realize the control of the opening and closing positions.

[0037] A packing gland 9 is arranged at the upper end of the global eccentric ball valve, a valve stem 6 is arranged inside the packing gland 9, and a packing 7 is filled inside the packing gland 9, the valve stem 6 is clamped by the packing 7, and the sealing performance of the valve stem 6 and the packing gland 9 is improved. A packing gland 8 is arranged at the upper end of the packing 7, and the packing gland 9 compresses the packing gland 8 by the tightening action of the bolts, thereby compressing the packing 7, and further improving the sealing performance at the valve stem 6.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A global eccentric ball valve, characterized in that: The invention comprises a valve body (1), a connecting body (2), a valve ball (3), a first valve seat sealing ring (4), a second valve seat sealing ring (5) and a valve stem (6); the valve ball (3) is arranged in a valve flow channel formed by the valve body (1) and the connecting body (2); one end of the valve ball (3) is connected to the valve stem (6); the valve ball (3) comprises a first hemisphere (31), a second hemisphere (32) and a cavity; the inner side wall of the valve body (1) is provided with a first valve seat sealing ring (4); the first valve seat sealing ring (4) is located in the first hemisphere A second valve seat sealing ring (5) is disposed on the inner wall of the connecting body (2) between the second hemisphere (32) and the connecting body (2); a center line b at the center of the first hemisphere (31) and a center line c at the center of the second hemisphere (32) are located on the upper and lower sides of a center line a of a valve flow channel, respectively; a center line of the first valve seat sealing ring (4) coincides with a center line b; and a center line of the second valve seat sealing ring (5) coincides with a center line c.

2. The full-spherical eccentric ball valve according to claim 1, characterized in that: The distance between the center line b and the center line a is h1, and the distance between the center line c and the center line a is h2, and h1 and h2 are not equal.

3. The full-spherical eccentric ball valve according to claim 1, characterized in that: The first hemisphere (31) and the second hemisphere (32) are welded together, and a cavity is formed inside the two.

4. The full-spherical eccentric ball valve according to claim 1, characterized in that: A first mounting groove is provided on the inner wall of the valve body (1), a first valve seat sealing ring (4) is provided in the first mounting groove, and a second mounting groove is provided on the inner wall of the connecting body (2), a second valve seat sealing ring (5) is provided in the second mounting groove.

5. The full-spherical eccentric ball valve according to claim 1, characterized in that: The valve body (1) and the connecting body (2) are detachably connected.

6. The full-spherical eccentric ball valve according to claim 1, characterized in that: The global eccentric ball valve further comprises an adapter (10) and a drive device (11); one end of the adapter (10) is connected to the valve stem (6), and the other end is connected to the drive device (11).

7. The full-spherical eccentric ball valve according to claim 1, characterized in that: A packing gland (9) is arranged at the upper end of the global eccentric ball valve, a valve stem (6) is arranged inside the packing gland (9), and the inside of the packing gland (9) is filled with packing (7), and a packing sleeve (8) is arranged at the upper end of the packing (7).

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