A fixed ball valve with smooth opening and closing

Abstract

This utility model relates to a smooth-opening and closing fixed ball valve, comprising a valve body, a ball core, a valve cover, and a medium passage. The valve cover is connected to the valve body and forms a valve cavity. The ball core is disposed in the valve cavity, and the medium passage is connected to the valve cavity. A valve seat is also provided at the inner port of the medium passage. The ball core has an outer spherical surface, and the valve seat has a sealing mating surface that seals with the outer spherical surface. An anti-adsorption annular groove is also provided on the sealing mating surface of the valve seat, with the center line of the valve seat as its axis. At least one anti-adsorption annular groove is provided on the valve seat. This smooth-opening and closing fixed ball valve effectively avoids the ball core adsorbing onto the valve seat, thus preventing the valve from opening and closing normally and overcoming problems such as uneven valve opening and closing, jamming, and vibration caused by adsorption between the ball core and the valve seat. This also improves the service life of the valve. This smooth-opening and closing fixed ball valve structure can be widely used in high-frequency switching fixed ball valves or other types of fixed ball valves.

Description

Technical Field

[0001] This utility model relates to a fixed ball valve. Background Technology

[0002] Fixed ball valves are prone to seat and ball jamming during (e.g., high-frequency) switching, leading to valve jamming. This is especially true in low-pressure liquid conditions. While a wide seat seal can extend seat life, this high degree of fit between the seat and ball makes them more susceptible to jamming, causing switching problems. Furthermore, fixed ball valves are prone to valve cavity blockage during operation, which also affects normal valve use. Utility Model Content

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a fixed ball valve that can be opened and closed smoothly.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a fixed ball valve that opens and closes smoothly, comprising a valve body, a ball core, a valve cover, and a medium channel. The valve cover is connected to the valve body and forms a valve cavity. The ball core is disposed in the valve cavity. The medium channel is connected to the valve cavity. A valve seat is also provided at the inner port of the medium channel. The ball core has an outer spherical surface, and the valve seat has a sealing mating surface. The sealing mating surface and the outer spherical surface are mated for sealing. The valve seat is characterized in that: an anti-adsorption annular groove is also provided on the sealing mating surface of the valve seat. The anti-adsorption annular groove is centered on the center line of the valve seat, and at least one ring of the anti-adsorption annular groove is provided on the valve seat.

[0005] The following optimizations or supplementary explanations can be made to the above technical solutions.

[0006] The ball core is also connected to a valve stem; the ball core is also equipped with a medium flow channel.

[0007] In addition, the valve cavity is also equipped with an inner lining filling component, which is located outside the ball core and has a valve stem clearance opening.

[0008] For example, the lining cavity component includes a left liner and a right liner.

[0009] For example, the valve stem includes an upper rod and a lower rod, with the upper end of the ball core connected to the upper rod and the lower end of the ball core connected to the lower rod; or even, the valve stem and the ball core can be integrated into one structure, with the upper rod and the lower rod coaxially arranged.

[0010] The valve body is equipped with a valve stem seat on the upper part, which is located on the upper side of the valve cavity. The valve stem seat is provided with an upper bushing for cooperating with the valve stem. The valve body is also equipped with a lower bushing for cooperating with the valve stem.

[0011] In addition, the connection between the valve stem and the ball core is set as a bushing limiting boss. The bushing limiting boss is provided with a grinding avoidance annular groove for grinding the outer spherical surface of the ball core. The grinding avoidance annular groove is centered on the center line of the valve stem. The bushing limiting boss is set inside the valve cavity.

[0012] Further optimization involves providing a first recess on the lower side of the valve stem seat, with the upper bushing positioned within the first recess and a bushing limiting boss on the lower side of the upper bushing. A second recess is provided at the lower part of the valve body, with the lower bushing positioned within the second recess and a bushing limiting boss on the upper side of the lower bushing.

[0013] In addition, the valve cover includes a left cover and a right cover. The left cover is connected to the left side of the valve body, and the right cover is connected to the right side of the valve body. Medium channels are provided on the left cover and the right cover respectively. Valve seats are respectively disposed at the inner ports of the left cover and the right cover. The left cover and the valve body are locked together by fasteners.

[0014] Further optimizations include an outer conical surface on the outer ring of the valve seat, located at the inner end of the valve seat; through holes on the left and right liner for the ball core to protrude and contact the valve seat; an inner contact surface on the inner side of the through hole, which fits against the outer spherical surface of the ball core; and an inner conical surface on the outer side of the through hole, which fits against the outer conical surface of the valve seat.

[0015] The beneficial effects of this utility model are that the smooth-opening and closing fixed ball valve can effectively avoid the ball core adhering to the valve seat, thus preventing the valve from opening and closing normally. It overcomes problems such as uneven valve opening and closing, jamming, and vibration caused by the adhering of the ball core to the valve seat, ensuring smooth valve opening and closing and thereby extending the valve's service life. This smooth-opening and closing fixed ball valve structure can be widely used in high-frequency switching fixed ball valves or other types of fixed ball valves. Attached Figure Description

[0016] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 The diagram shows the structure of the device, which includes an actuator and an inner lining cavity component.

[0019] Figure 3 for Figure 1 A schematic diagram of the structure of the ball core and valve stem.

[0020] Figure 4 for Figure 1 A schematic diagram of the structure of the valve seat on one side.

[0021] Figure 5 for Figure 4 Enlarged view of the middle part of the structure.

[0022] Figure 6 for Figure 2 Schematic diagram of the middle section.

[0023] Figure 7 for Figure 2 A schematic diagram of the structure of the inner lining cavity component.

[0024] Figure 8 for Figure 7 Top view.

[0025] Figure 9 This is a schematic diagram of the structure in which the valve seat and the ball core are mutually fitted and ground in this utility model.

[0026] In the picture: 1. Valve body; 10. Actuator; 13. Second notch; 2. Core; 20. Outer spherical surface; 3. Valve cover; 31. Left cover; 32. Right cover; 33. Pressure spring; 4. Medium channel; 5. Valve cavity; 6. Valve seat; 60. Sealing mating surface; 61. Anti-adsorption annular groove; 7. Valve stem; 71. Upper rod; 72. Lower rod; 73. Bushing limiting boss; 74. Grinding clearance annular groove; 8. Inner lining cavity components; 80. Valve stem clearance opening; 81. Left lining; 82. Right lining; 9. Valve stem seat; 91. Upper bushing; 92. Lower bushing; 93. First notch. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] Referring to the accompanying drawings, a smooth-opening and closing fixed ball valve in this embodiment includes a valve body 1, a ball core 2, a valve cover 3, and a medium passage 4. The valve cover 3 is connected to the valve body 1 and forms a valve cavity 5. The ball core 2 is disposed in the valve cavity 5. The medium passage 4 is connected to the valve cavity 5 and provides a valve for normal medium flow. A valve seat 6 is also provided at the inner port of the medium passage 4. The valve seat 6 has a sealing mating surface 60. The ball core 2 has an outer spherical surface 20. The outer spherical surface 20 of the ball core 2 and the sealing mating surface 60 of the valve seat 6 (usually an annular mating surface, such as an annular spherical curved surface) are mutually sealed to allow the ball core 2 to cooperate with the valve opening and closing and / or flow regulation during operation in the valve cavity 5. The sealing mating method between the outer spherical surface 20 and the sealing mating surface 60 of the valve seat 6 is a conventional and mature technology.

[0029] In this type of fixed ball valve that allows for smooth opening and closing, to prevent the valve seat 6 from seizing up with the ball core 2, the following optimizations are made: an anti-adsorption annular groove 61 is provided on the sealing mating surface 60 of the valve seat 6. The anti-adsorption annular groove 61 is centered on the center line of the valve seat 6. The valve seat 6 is usually an annular structure, and the center line (or axis) of the valve seat 6 is the axis (or axis) of the anti-adsorption annular groove 61. The anti-adsorption annular groove 61 on the valve seat 6 is provided at least once, usually one circle is sufficient, but two, three or more circles can be provided as needed.

[0030] Its working principle is as follows: the ball core 2 (or valve core, ball, etc.) is configured in the valve cavity 5 and cooperates with the valve seat 6 to control the valve. During the operation, the outer spherical surface 20 of the ball core 2 and the sealing mating surface 60 of the valve seat 6 are in a close and sealed state. An anti-adsorption annular groove 61 is provided on the sealing mating surface 60 of the valve seat 6 to effectively avoid problems such as irregular opening and closing, jamming, and shaking caused by the outer spherical surface 20 and the sealing mating surface 60 adsorbing and seizing between the ball core 2 and the valve seat 6.

[0031] This type of fixed ball valve with smooth opening and closing can effectively avoid the ball core 2 and valve seat 6 adhering to each other, thus preventing the normal opening and closing of the valve. It overcomes problems such as valve opening and closing not being smooth, jamming, and shaking caused by the adhering between the ball core and valve seat 6, thereby also improving the service life of the valve.

[0032] This type of smooth-opening and closing fixed ball valve structure can be widely used in high-frequency switching fixed ball valves or other types of fixed ball valves.

[0033] Based on the above embodiments, the following optimizations or further explanations can be made.

[0034] The ball core 2 is also connected to a valve stem 7, which is driven by an actuator (such as actuator 10). The valve stem 7 is operated to drive the ball core 2 to rotate in the valve cavity 5, and the valve stem 7 can also support the ball core 2 to rotate in the valve cavity 5. The ball core 2 is also provided with a medium flow channel 21, so that the medium can pass through the ball core 2 when the valve is opened during the operation of the ball core 2. This is a conventional and mature technology.

[0035] In this design, the two walls of the anti-adsorption annular groove 61 of the valve seat 6 can be perpendicular to each other. One wall forms a radial annular groove with the valve seat axis as the center, while the other wall forms an axial annular groove with the valve seat axis as the center. This structure is relatively easy to manufacture. Furthermore, the included angle of the groove walls can be rounded. The anti-adsorption annular groove 61 divides the sealing mating surface 60 of the valve seat 6 into two, forming two seals and improving the sealing performance between the valve seat and the ball core. Secondly, during the ball core switching process, the medium enters the anti-adsorption annular groove 61, effectively solving the problem of valve seat and ball core adsorption caused by grinding and mating. This avoids additional torque generated during valve switching (especially under low-pressure conditions) and prevents valve vibration and jamming.

[0036] Furthermore, the valve cavity 5 is further optimized by including an inner lining packing component 8. This component 8 is positioned outside the ball core 2 and includes a stem clearance opening 80. This opening allows the valve stem 7 to pass smoothly without affecting its connection to the ball core 2. The inner lining packing component 8 fills the area outside (outer periphery) of the ball core 2 within the valve cavity 5, reducing the risk of media accumulation in this area and effectively preventing media blockage. This prevents blockage from affecting the normal operation of the ball core 2, ensuring smooth valve opening and closing. The inner lining packing component also provides additional support to the outside (outer periphery) of the ball core 2 within the valve cavity 5, providing additional auxiliary support and making the ball core 2 operate more stably. This also improves the valve's service life. For example, a spherical surface design on the inner side of the inner lining packing component near the ball core 2 provides better support.

[0037] For example, the inner lining cavity component 8 includes a left liner 81 and a right liner 82. The left-right structure facilitates its assembly in the valve. For instance, the left liner 81 and the right liner 82 can be arranged in a left-right split configuration. The inner lining cavity component 8 can be made of engineering plastics (such as polytetrafluoroethylene PTFE), which has a relatively low coefficient of friction; of course, other materials can also be selected according to requirements.

[0038] Furthermore, the valve stem 7 includes an upper stem 71 and a lower stem 72, with the upper end of the ball core 2 connected to the upper stem 71 and the lower end of the ball core 2 connected to the lower stem 72. In fact, the valve stem 7 and the ball core 2 are integrated into a single structure, resulting in better structural stability. The upper stem 71 and the lower stem 72 are coaxially (i.e., on the same axis).

[0039] The valve body 1 is equipped with a valve stem seat 9 on its upper part. The valve stem seat 9 is located on the upper side of the valve cavity 5. The valve stem seat 9 is used to assemble with the valve stem (such as its upper stem 71) (corresponding packing structures can be set, which is a mature technology). In addition, the valve stem seat 9 is provided with an upper bushing 91 for cooperating with the operation of the valve stem 7. For example, the upper bushing 91 can be passed through to support the operation of the upper stem 71. The lower part of the valve body 1 is provided with a lower bushing 92 for cooperating with the operation of the valve stem. For example, the lower bushing 92 can be passed through to support the operation of the lower stem 72.

[0040] In addition, a bushing limiting boss 73 is set at the connection between the valve stem 7 and the ball core 2. The bushing limiting boss 73 is set in the valve cavity 5. The bushing limiting boss 73 can cooperate to limit the position of the corresponding bushing, cooperate with the corresponding bearing installation and stable operation. Moreover, the bushing limiting boss 73 can separate the ball core 2 from the corresponding bushing (i.e., the upper bushing 91 and the lower bushing 92) to avoid collision and scratches on the outer spherical surface 20 during the assembly and operation of the ball core 2. In addition, the bushing limiting boss 73 is provided with a grinding avoidance annular groove 74. The grinding avoidance annular groove 74 is centered on the center line of the valve stem 7. The grinding avoidance annular groove 74 facilitates the grinding operation of the outer spherical surface 20 of the ball core 2. The valve seat 6 can better perform the grinding operation on the outer spherical surface 20. It has a spatial position avoidance valve seat 6, reduces the difficulty of the valve seat 6 and the ball core 2 to cooperate and grind, and can significantly improve the stability and position accuracy of the ball core.

[0041] For example, the lower side of the valve stem seat 9 is provided with a first recess 93, that is, the lower end of the valve stem hole of the valve stem seat 9 is additionally provided with a first recess 93 (forming a stepped hole structure). The upper bushing 91 is provided in the first recess 93 to facilitate the installation of the upper bushing 91. The lower side of the upper bushing 91 is a bushing limiting boss 73 to limit the upper bushing 91 in the first recess 93. The lower part of the valve body 1 is provided with a second recess 13, and the lower bushing 92 is provided in the second recess 13. The upper side of the lower bushing 92 is a bushing limiting boss 73 to limit the lower bushing 92 in the second recess 13.

[0042] For example, the valve cover 3 includes a left cover 31 and a right cover 32. The left cover 31 is connected to the left side of the valve body 1, and the right cover 32 is connected to the right side of the valve body 1. They are usually locked together by fasteners such as bolts. The medium channel 4 is provided on the left cover 31 and the right cover 32 respectively, and the valve seat 6 is respectively disposed at the inner port of the left cover 31 and the right cover 32.

[0043] The valve seat 6 has an outer conical surface 62 on its outer ring, located at the inner end of the valve seat 6 (i.e., towards the inner end of the central valve cavity 5). Referring to the attached diagram, the outer ring of the outer conical surface 62 at the inner end is located on the outer ring, while the sealing mating surface 60 is located at the inner ring of the valve seat 6 at the inner end. The left liner 81 and right liner 82 each have through holes 84 for the ball core 2 to protrude and contact the valve seat 6. These through holes 84 allow the ball core 2 to protrude and contact the valve seat 6 for sealing and valve opening and closing, and also facilitate the flow of medium through the ball core 2 (its medium flow channel 21) when the valve is open. Furthermore, the inner side of the through holes 84 in the left liner 81 and right liner 82 has an internal connection... The inner contact surface 85 (which can be configured as an inner spherical surface) mates and abuts against the outer spherical surface 20 of the ball core 2. The left and right liners 81 and 82 provide good support for the ball core 2, improving its operational stability. Furthermore, the outer sides of the through holes 84 of the left and right liners 81 and 82 have inner conical surfaces 86, which mate and abut against the outer conical surface 62 of the valve seat 6. When the valve seat is pressed against the lining cavity component (such as the left or right lining 81), the inner contact surfaces 85 of the left and right liners 81 and 82 can make tight contact with the outer spherical surface 20 of the ball core 2, effectively preventing media accumulation on the outer surface of the ball core and significantly extending the valve's service life. In this structure, the lining cavity component (including the left and right liners 81 and 82), the valve seat 6, and the ball core 2 cooperate with each other. In this structure, the inner end of the valve seat extends into the valve cavity (relatively protruding).

[0044] Typically, the valve seat 6 is equipped with a pressure spring 33 that applies pressure toward the ball core so that the valve seat compresses the corresponding lining cavity component (such as the left lining 81 or the right lining 82). Of course, when the left cover 31 is locked to the valve body 1 by fasteners, the valve seat can also compress the corresponding lining cavity component (such as the left lining 81 or the right lining 82).

Claims

1. A fixed ball valve that opens and closes smoothly, comprising a valve body (1), a ball core (2), a valve cover (3), and a medium passage (4). The valve cover (3) is connected to the valve body (1) and forms a valve cavity (5). The ball core (2) is disposed in the valve cavity (5). The ball core (2) is also connected to the valve stem (7). The valve stem (7) includes an upper rod (71) and a lower rod (72). The medium channel (4) is connected to the valve cavity (5). The inner port of the medium channel (4) is also equipped with a valve seat (6). The ball core (2) has an outer spherical surface (20). The valve seat (6) has a sealing mating surface (60). The sealing mating surface (60) and the outer spherical surface (20) are sealed together. The feature is that: The valve seat (6) also has an anti-adsorption annular groove (61) on the sealing mating surface (60). The anti-adsorption annular groove (61) is centered on the center line of the valve seat (6). At least one ring of anti-adsorption annular groove (61) is provided on the valve seat (6).

2. The fixed ball valve with smooth opening and closing as described in claim 1, characterized in that: The ball core (2) is also provided with a medium flow channel (21), and the valve stem is connected to an actuator.

3. The fixed ball valve with smooth opening and closing as described in claim 1, characterized in that: The valve cavity (5) is also equipped with an inner lining filling component (8), which is located outside the ball core (2) and has a valve stem clearance opening (80).

4. A fixed ball valve for smooth opening and closing as described in claim 3, characterized in that: The lining cavity component (8) includes a left liner (81) and a right liner (82).

5. A fixed ball valve for smooth opening and closing as described in claim 1, characterized in that: The upper end of the ball core (2) is connected to the upper rod (71). The lower end of the ball core (2) is connected to the lower rod (72). The valve stem (7) and the ball core (2) are integrated into one structure, and the upper rod (71) and the lower rod (72) are coaxially arranged.

6. A fixed ball valve for smooth opening and closing as described in claim 1 or 5, characterized in that: A valve stem seat (9) is also installed on the upper part of the valve body (1). The valve stem seat (9) is located on the upper side of the valve cavity (5). An upper bushing (91) is provided on the valve stem seat (9) to cooperate with the operation of the valve stem (7). The lower part of the valve body (1) is provided with a lower bushing (92) for cooperating with the valve stem (7).

7. A fixed ball valve for smooth opening and closing as described in claim 6, characterized in that: The connection between the valve stem (7) and the ball core (2) is provided as a bushing limiting boss (73). The bushing limiting boss (73) is provided with a grinding avoidance annular groove (74) for grinding the outer spherical surface (20) of the ball core (2). The grinding avoidance annular groove (74) is centered on the center line of the valve stem (7). The bushing limiting boss (73) is set inside the valve cavity (5).

8. A fixed ball valve for smooth opening and closing as described in claim 7, characterized in that: The lower side of the valve stem seat (9) is provided with a first notch (93), and the upper bushing (91) is provided in the first notch (93). The lower side of the upper bushing (91) is a bushing limiting boss (73). The lower part of the valve body (1) is provided with a second recess (13), and the lower bushing (92) is provided in the second recess (13). The upper side of the lower bushing (92) is a bushing limiting boss (73).

9. A fixed ball valve for smooth opening and closing as described in claim 1, characterized in that: The valve cover (3) includes a left cover (31) and a right cover (32). The left cover (31) is connected to the left side of the valve body (1), and the right cover (32) is connected to the right side of the valve body (1). Medium channels (4) are respectively provided on the left cover (31) and the right cover (32). The valve seat (6) is respectively located at the inner port of the left cover (31) and the right cover (32). The left cover (31) and the valve body (1) are locked together by fasteners.

10. A smooth-opening and closing fixed ball valve as described in claim 4 or 9, characterized in that: The outer ring of the valve seat (6) is provided with an outer conical surface (62), which is located at the inner end of the valve seat (6). The left liner (81) and the right liner (82) are respectively provided with through holes (84) for the ball core (2) to be exposed and contact the valve seat (6). The inner side of the through hole (84) has an inner contact surface (85), which fits against the outer spherical surface (20) of the ball core (2). The outer side of the through hole (84) has an inner conical surface (86), which fits against the outer conical surface (62) of the valve seat (6).

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