A double eccentric ball valve

Abstract

This utility model discloses a double eccentric ball valve, relating to the field of ball valve technology. It includes a valve body with a fluid channel and a valve stem channel perpendicular to each other. A valve seat and a valve core are disposed within the fluid channel, forming a sealing fit. The sealing surface of the valve core is hemispherical. A valve stem is disposed within the valve stem channel, which includes an upper shaft hole and a lower shaft hole. An upper shaft sleeve is disposed within the upper shaft hole, and a lower shaft sleeve is disposed within the lower shaft hole. A through hole is provided on the valve core. The valve stem passes sequentially through the upper shaft sleeve, the through hole, and the lower shaft sleeve. Rotating the valve stem causes the valve core to rotate around its axis, resulting in a tight fit between the valve core sealing surface and the valve seat sealing surface. The offset between the valve stem axis and the valve core sealing surface is A, and the offset between the valve stem axis and the fluid channel axis is B. This solves the problem of sealing failure between the valve core and the valve seat caused by long-term friction.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology, specifically relating to a double eccentric ball valve. Background Technology

[0002] Ball valves are widely used in pipelines because they have the functions of shutting off and regulating flow. After the ball valve is opened, there are no obstructions in its internal cavity, and it is a straight-through valve with the pipeline, without generating reverse impact force. Therefore, ball valves are widely used in pipelines. However, they still have some drawbacks. The valve core and valve seat rotate and move back and forth on the same axis. The valve core and valve seat achieve the opening and closing of the valve through long-term friction. Long-term friction can damage or shrink the ball and valve seat, and corrosive media can cause the spring to fail, which can lead to the ball valve losing its sealing function. Utility Model Content

[0003] The purpose of this invention is to provide a double eccentric ball valve to solve the problem of sealing failure caused by long-term friction between the valve core and valve seat in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A double eccentric ball valve includes a valve body with a fluid channel and a valve stem channel perpendicular to each other inside the valve body. A valve seat and a valve core are disposed in the fluid channel and are mutually sealingly fitted. The sealing surface of the valve core is hemispherical. A valve stem is disposed in the valve stem channel, which includes an upper shaft hole and a lower shaft hole. An upper shaft sleeve is disposed in the upper shaft hole, and a lower shaft sleeve is disposed in the lower shaft hole. A through hole is disposed on the valve core. The valve stem passes through the upper shaft sleeve, the through hole, and the lower shaft sleeve in sequence. Rotating the valve stem can drive the valve core to rotate around the valve stem axis.

[0006] The valve seat is provided with a boss, the valve seat is a tubular structure, and the valve seat is provided with an abutment platform, which abuts and engages with the boss. A mounting seat is provided on the outside of the valve seat, the valve seat is threadedly connected to the mounting seat, and the mounting seat is fixedly connected to the valve body.

[0007] The offset between the valve stem axis and the valve core sealing surface is A, and the offset between the valve stem axis and the fluid passage axis is B.

[0008] As an alternative or supplement to the aforementioned double eccentric ball valve, a second boss is provided in the upper shaft hole, and a first shoulder is provided on the upper shaft sleeve. The second boss and the first shoulder are engaged in a snap-fit ​​relationship.

[0009] As an alternative or supplement to the aforementioned double eccentric ball valve, a packing layer is provided above the upper bushing, and a gland is provided above the packing layer.

[0010] As an alternative or supplement to the aforementioned double eccentric ball valve, the packing layer includes an upper packing liner, packing, and a lower packing liner, with the packing located between the upper packing liner and the lower packing liner.

[0011] As an alternative or supplement to the aforementioned double eccentric ball valve, a sealing groove is provided on the inner side of the bottom of the upper bushing, and a sealing ring is provided in the sealing groove.

[0012] A boss three is provided in the lower shaft hole, and a shoulder two is provided on the lower shaft sleeve. The boss three and the shoulder two are engaged.

[0013] The beneficial effects of this utility model through the above technical solution are:

[0014] This invention solves the problem of sealing failure caused by long-term friction between the valve core and valve seat in the prior art. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the eccentric structure between the valve stem axis and the valve core sealing surface of this utility model;

[0017] Figure 3 This is a schematic diagram of the eccentric structure between the valve stem axis and the fluid channel axis of this utility model.

[0018] In the diagram: 1. Valve body; 100. Fluid passage; 200. Valve stem passage; 2. Valve seat; 3. Valve core; 4. Valve stem; 5. Upper shaft hole; 6. Lower shaft hole; 7. Upper shaft sleeve; 8. Lower shaft sleeve; 9. Through hole; 10. Boss 1; 11. Abutment platform; 12. Mounting seat; 13. Boss 2; 14. Shoulder 1; 15. Gland; 16. Upper packing gasket; 17. Packing; 18. Lower packing gasket; 19. Sealing groove; 20. Sealing ring; 21. Boss 3; 22. Shoulder 2. Detailed Implementation

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0020] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0021] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0022] Example

[0023] See Figures 1-3 This utility model discloses a double eccentric ball valve, including a valve body 1. The valve body 1 has a fluid channel 100 and a valve stem channel 200 that are perpendicular to each other. The fluid channel 100 is used for medium flow, and the valve stem channel 200 is used for mounting the valve stem 4.

[0024] The fluid channel 100 is provided with a valve seat 2 and a valve core 3 that are mutually sealed and fitted. The sealing surface of the valve core 3 is hemispherical. The valve stem channel 200 is provided with a valve stem 4. The valve stem channel 200 includes an upper shaft hole 5 and a lower shaft hole 6, which are located on both sides of the fluid channel 100. The upper shaft hole 5 is open at both ends, and the lower shaft hole 6 is open only on one side close to the fluid channel 100. An upper shaft sleeve 7 is provided in the upper shaft hole 5, and a lower shaft sleeve 8 is provided in the lower shaft hole 6. The valve core 3 is provided with a through hole 9. The valve stem 4 passes through the upper shaft sleeve 7, the through hole 9, and the lower shaft sleeve 8 in sequence. Rotating the valve stem 4 can drive the valve core 3 to rotate around the axis of the valve stem 4.

[0025] See Figure 2 and Figure 3 The offset between the axis of the valve stem 4 and the sealing surface of the valve core 3 is A, and the offset between the axis of the valve stem 4 and the axis of the fluid channel 100 is B.

[0026] The valve core 3 detaches from the valve seat 2 at the moment of opening, rotates about 85° without contact, and only wedges and presses in the last 5° return stroke. The sliding friction is reduced from 90° to 5°, the friction work is reduced by more than 90%, the sealing surface morphology remains intact for a long time, and the leakage rate remains stable at zero level for a long time.

[0027] Specifically, the valve seat 2 is provided with a boss 10, the valve seat 2 has an L-shaped cross section, and the valve seat 2 is provided with an abutment platform 11, which abuts against the boss 10. The valve seat 2 is provided with a mounting seat 12 on its outer side, and the valve seat 2 is threadedly connected to the mounting seat 12. After installation, the valve seat 2 is fixed between the boss 10 and the mounting seat 12.

[0028] In some embodiments, a second boss 13 is provided in the upper shaft hole 5, and a first shoulder 14 is provided on the upper shaft sleeve 7. The second boss 13 and the first shoulder 14 are engaged. The upper shaft sleeve 7 is fixed, and after fixing, the upper end of the upper shaft sleeve 7 is located in the upper shaft hole 5, and the lower end of the upper shaft sleeve 7 extends into the fluid channel 100. Similarly, a third boss 21 is provided in the lower shaft hole 6, and a second shoulder 22 is provided on the lower shaft sleeve 8. The third boss 21 and the second shoulder 22 are engaged. The fixing method of the lower shaft sleeve 8 is the same as that of the upper shaft sleeve 7, and will not be described in detail here. The valve stem 4 is guided and limited by the setting of the upper shaft sleeve 7 and the lower shaft sleeve 8.

[0029] To prevent media leakage, a packing layer is provided above the upper bushing 7, and a pressure cap 15 is provided above the packing layer; specifically, the packing layer 17 includes an upper packing liner 16, a packing 17, and a lower packing liner 18, with the packing 17 located between the upper packing liner 16 and the lower packing liner 18; in this embodiment, the packing layer is provided in two layers, and the two packing layers are separated by a spacer.

[0030] Furthermore, a sealing groove 19 is provided on the inner side of the bottom of the upper bushing 7, and a sealing ring 20 is provided in the sealing groove 19; similarly, a sealing groove 19 is also provided on the inner side of the top of the lower bushing 8, and a sealing ring 20 is also provided in the sealing groove 19, which further improves the sealing performance.

[0031] The double eccentric ball valve of this invention solves the problem of sealing failure caused by long-term friction between valve core 3 and valve seat 2 in the prior art through its double eccentric design.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A double eccentric ball valve, characterized in that, The valve includes a valve body (1), which has a fluid channel (100) and a valve stem channel (200) that are perpendicular to each other. The fluid channel (100) has a valve seat (2) and a valve core (3) that are sealed to each other. The sealing surface of the valve core (3) is hemispherical. The valve stem channel (200) has a valve stem (4) and includes an upper shaft hole (5) and a lower shaft hole (6). The upper shaft hole (5) has an upper shaft sleeve (7) and the lower shaft hole (6) has a lower shaft sleeve (8). The valve core (3) has a through hole (9). The valve stem (4) passes through the upper shaft sleeve (7), the through hole (9) and the lower shaft sleeve (8) in sequence. Rotating the valve stem (4) can drive the valve core (3) to rotate around the axis of the valve stem (4). The valve seat (2) is provided with a boss (10), the valve seat (2) is a tubular structure, the valve seat (2) is provided with an abutment (11), the abutment (11) and the boss (10) abut against each other, the valve seat (2) is provided with an mounting seat (12) on the outside, the valve seat (2) and the mounting seat (12) are threadedly connected, and the mounting seat (12) is fixedly connected to the valve body (1); The offset between the valve stem (4) axis and the valve core (3) sealing surface is A, and the offset between the valve stem (4) axis and the fluid passage (100) axis is B.

2. A double eccentric ball valve according to claim 1, characterized in that The upper shaft hole (5) is provided with a second boss (13), and the upper shaft sleeve (7) is provided with a first shoulder (14). The second boss (13) and the first shoulder (14) are engaged.

3. A double eccentric ball valve according to claim 2, characterized in that A packing layer is provided above the upper bushing (7), and a pressure cap (15) is provided above the packing layer.

4. A double eccentric ball valve according to claim 3, characterized in that The packing layer includes an upper packing liner (16), a packing (17), and a lower packing liner (18), with the packing (17) located between the upper packing liner (16) and the lower packing liner (18).

5. A double eccentric ball valve according to claim 1, characterized in that A sealing groove (19) is provided on the inner side of the bottom of the upper bushing (7), and a sealing ring (20) is provided in the sealing groove (19).

6. A double eccentric ball valve according to claim 1, characterized in that A boss three (21) is provided in the lower shaft hole (6), and a shoulder two (22) is provided on the lower shaft sleeve (8). The boss three (21) and the shoulder two (22) are engaged.

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