Ceramic double-eccentric semi-ball valve sealing device

Abstract

The invention relates to the technical field of double-eccentric semi-ball valve sealing, and discloses a ceramic double-eccentric semi-ball valve sealing device which is arranged between a valve seat and a valve element of a double-eccentric semi-ball valve and used for sealing between the valve seat and the valve element and comprises a valve element sealing ring arranged on a valve body. An expansion joint is arranged between the valve element sealing ring and the valve seat and used for making the valve element sealing ring make contact with the valve element. An adjusting mechanism is arranged between the expansion joint and the valve body and used for adjusting the distance between the valve element sealing ring and the valve element. According to the ceramic double-eccentric half-ball valve sealing device, by arranging the expansion joint, the position of the valve element sealing ring can be automatically adjusted under the action of the adjusting mechanism, tight contact can be kept even if the sealing ring is slightly abraded, and the continuous and stable sealing performance is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of double eccentric hemispherical valve sealing, and in particular to a ceramic double eccentric hemispherical valve sealing device. Background Art

[0002] In modern industry, valves, as key components of fluid control systems, are widely used in many fields such as petrochemicals, electric power, metallurgy, water treatment, etc. With the development of industrial technology and the improvement of environmental protection requirements, the market demand for high-performance valves is growing. As an important fluid control equipment, double eccentric hemispherical valves are widely used in many fields such as petrochemicals, electric power, metallurgy, water treatment, etc. Its main function is to realize the opening, closing and flow regulation of the medium in the pipeline system.

[0003] In recent years, with the progress of material science and technology, ceramic materials have been gradually applied to valve manufacturing due to their excellent heat resistance, corrosion resistance and low friction coefficient. As a new type of valve, the ceramic double eccentric hemispherical valve combines the advantages of ceramic materials and unique structural design, becoming one of the effective ways to solve the above problems. However, even with the use of advanced ceramic materials, how to ensure the reliable sealing of the valve under various working conditions is still a problem to be solved.

[0004] The existing ceramic double eccentric hemispherical valve sealing device is shown in the attached figure of the specification. Figure 1 and Figure 2 As shown, the valve seat is in contact with one end of the valve core sealing ring through bolts, and a sealing ring is provided on the side of the valve core sealing ring in contact with the valve core to achieve the effect of sealing the valve core. The above sealing device achieves the sealing effect through the elastic material of the sealing ring. When used for a long time, the sealing ring will wear out, affecting the sealing effect and causing the phenomenon of loose sealing. A new sealing ring needs to be replaced, which affects the use effect of the sealing device. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above problems, the present application provides a ceramic double eccentric hemispherical valve sealing device.

[0007] (II) Technical solution

[0008] In order to solve the above problems, the present application provides the following technical solutions: a ceramic double eccentric hemispherical valve sealing device, the sealing device is arranged between the valve seat and the valve core of the double eccentric hemispherical valve, and is used for sealing between the valve seat and the valve core, the sealing device includes a valve core sealing ring, the valve core sealing ring is arranged on the valve body and slides in the valve body, and an expansion joint is arranged between the valve core sealing ring and the valve seat, and is used for making the valve core sealing ring contact with the valve core;

[0009] An adjusting mechanism is arranged between the expansion joint and the valve body, and is used for adjusting the distance between the valve core sealing ring and the valve core.

[0010] Preferably, a plurality of sealing grooves are provided on the side of the valve core sealing ring that contacts the inner wall of the valve body, and a sealing ring is provided in the sealing groove to seal the valve core sealing ring and the valve body;

[0011] A sealing ring groove is provided on the side of the valve core sealing ring that contacts the valve core, a sealing ring is fixedly installed in the sealing ring groove, the inner side of the sealing ring groove is arranged in a "V"-shaped surface, and the side of the sealing ring that contacts the sealing ring groove is arranged in a "V"-shaped mouth shape, so as to increase the sealing length of the contact surface;

[0012] The angle of the "V"-shaped surface inside the sealing ring groove is V1, and the opening angle of the "V"-shaped opening of the sealing ring is V2;

[0013] Among them, 45°≦V1 / V2≦135°, and 0°≦V2-V1≦5°;

[0014] The distance between the valve core sealing ring and the side of the valve body is H1, and the distance between the sealing ring and the sealing ring groove is H2;

[0015] Among them, 1mm≦H1 / H2≦5mm, and 0.5mm≦H2-H1≦2mm.

[0016] Preferably, the adjustment mechanism is composed of an elastic component, the elastic component includes a spring and a slide rod, the number of the slide rods is two, the two slide rods are located between the expansion joint and the inner wall of the valve body, and the two slide rods are respectively fixedly installed between the valve core sealing ring and the valve seat;

[0017] The spring is arranged on the two sliding rods, and the two ends of the spring are fixedly connected to the valve core sealing ring and the valve seat respectively. The distance between the two sliding rods is H3, wherein H3>H2.

[0018] Preferably, the adjusting mechanism is composed of a pushing assembly, which includes a threaded rod, a threaded sleeve is threaded on the threaded rod, connecting rods are respectively connected to both sides of the threaded sleeve, and the ends of the connecting rods are respectively connected to connecting blocks, and the two connecting blocks are respectively fixedly connected to the sealing ring and the valve seat, one end of the threaded rod is connected to the connecting rod, and the other end of the connecting rod passes through the outside of the valve body and is connected to the transmission box.

[0019] Preferably, a worm is rotatably connected in the transmission box, a turbine is fixedly mounted on the connecting rod in the transmission box, the turbine is meshed with the worm, and the worm is connected to a handle for driving the worm to rotate so as to rotate the turbine.

[0020] Preferably, the regulating mechanism is composed of a hydraulic mechanism, which includes an oil cylinder, a partition is arranged in the oil cylinder, one end of the oil cylinder is fixedly installed on the valve seat, and the other end is slidably connected with a slide rod, one end of the slide rod sliding in the oil cylinder is fixedly connected to the partition, and the other end of the slide rod is fixedly connected to the sealing ring for pushing the sealing ring to move;

[0021] The partition is used to divide the oil cylinder into an oil inlet chamber or an oil outlet chamber, and is respectively provided with an oil inlet or an oil outlet, the oil inlet or the oil outlet is respectively connected to a first oil pipe and a second oil pipe, and the ends of the first oil pipe and the second oil pipe are connected to an electromagnetic reversing valve.

[0022] Preferably, the electromagnetic reversing valve is installed in a fixed frame, an oil tank is also fixedly installed in the fixed frame, the oil tank is connected to an oil pump, the oil outlet of the oil pump is connected to an oil pipeline, and the oil pipeline is connected to the reversing electromagnetic valve.

[0023] Preferably, a ceramic double eccentric hemispherical valve further comprises a valve body, a valve seat and a valve core, wherein the valve core is arranged in a hemispherical shape, and the upper and lower ends of the valve core are respectively connected to an upper valve core bearing and a lower valve core bearing, wherein the upper valve core bearing is connected to a valve stem for driving the valve core to rotate between the upper valve core bearing and the lower valve core bearing, and the lower valve core bearing is fixedly installed at the bottom of the valve body by a screw or a screw;

[0024] A first connecting flange is provided at the inlet and outlet on both sides of the valve body. The first connecting flange is connected to the pipeline under the action of bolts. The valve stem is connected to the driving mechanism through a second flange. The driving mechanism is driven by a motor or a worm gear to drive the valve stem to rotate.

[0025] Preferably, the inner wall of the valve body is fixedly mounted with a valve body core by bolts or screws, and a sealing pressure plate is installed at the arc-shaped end of the valve core, and the sealing pressure plate is fixedly mounted on the valve core by a first bolt;

[0026] The valve seat is fixedly installed on one side of the valve body, and the valve seat is fixedly installed on the valve seat by a second bolt.

[0027] Preferably, the inner core of the valve body and the valve core are both made of ceramic material.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present application provides a ceramic double eccentric hemispherical valve sealing device, which has the following beneficial effects:

[0030] 1. The ceramic double eccentric hemispherical valve sealing device, by setting an expansion joint, enables the valve core sealing ring to automatically adjust its position under the action of the adjustment mechanism, and can maintain close contact even when the sealing ring is slightly worn, ensuring continuous and stable sealing performance.

[0031] 2. The ceramic double eccentric hemispherical valve sealing device adopts a "V"-shaped surface setting on the side where the valve core sealing ring contacts the valve core. Combined with the "V"-shaped mouth design of the sealing ring, the effective length of the sealing surface is greatly increased, and the sealing performance is improved, especially in high-pressure environments, ensuring that the sealing material is evenly distributed when under stress and extending the service life.

[0032] 3. The ceramic double eccentric hemispherical valve sealing device has a variety of adjustment schemes including elastic components, push components or oil pressure groups. Users can choose the most appropriate adjustment method according to the specific application scenario.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 This is one of the structural schematic diagrams of the double eccentric hemispherical valve of this application;

[0036] Figure 2 This is a schematic diagram of the structure of the existing sealing device of this application;

[0037] Figure 3 This is the second structural diagram of the double eccentric hemispherical valve of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the elastic sealing device of this application;

[0039] Figure 5 This is a schematic diagram of the structure of the valve core sealing ring of this application;

[0040] Figure 6 This is a schematic diagram of the structure of the expansion joint for this application;

[0041] Figure 7 This is the third structural diagram of the double eccentric hemispherical valve of this application;

[0042] Figure 8 This is one of the structural schematic diagrams of the sealing device of the push assembly of this application;

[0043] Fig. 9 This is the second structural schematic diagram of the sealing device of the driving assembly of the present application;

[0044] Fig.10 This is a schematic diagram of the structure of the connecting rod mechanism of this application;

[0045] Fig.11This is a schematic diagram of the structure of the turbine transmission mechanism of this application;

[0046] Fig.12 This is the fourth structural diagram of the double eccentric hemispherical valve of this application;

[0047] Fig.13 This is one of the structural schematic diagrams of the oil pressure component sealing device of this application;

[0048] Fig.14 This is the second structural schematic diagram of the oil pressure component sealing device of the present application;

[0049] Fig.15 This is a structural schematic diagram of the oil pressure delivery mechanism of this application.

[0050] Figure numerals: 1, valve body; 2, lower valve core bearing; 21, upper valve core bearing; 22, valve stem; 3, valve body core; 4, first flange; 41, second flange; 5, valve core; 6, sealing plate; 61, first bolt; 7, valve core sealing ring; 71, sealing ring; 72, sealing ring groove; 73, sealing groove; 74, sealing ring; 8, valve seat; 81, second bolt; 9, expansion joint; 91, spring; 92, slide rod; 101. threaded sleeve; 102. threaded rod; 103. connecting rod; 104. connecting block; 11. transmission box; 111. turbine; 112. worm; 113. handle; 114. connecting rod; 12. fixed frame; 121. oil tank; 122. oil pump; 123. oil pipeline; 124. reversing solenoid valve; 125. first oil pipeline; 126. second oil pipeline; 13. oil cylinder; 131. sliding rod; 132. partition. DETAILED DESCRIPTION

[0051] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0052] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] See also Figure 3-Figure 4 The present application provides a new technical solution: a ceramic double eccentric hemispherical valve sealing device, the sealing device is arranged between the double eccentric hemispherical valve seat 8 and the valve core 5, and is used for sealing between the valve seat 8 and the valve core 5, the sealing device includes a valve core sealing ring 7, the valve core sealing ring 7 is arranged on the valve body 1, and slides in the valve body 1, an expansion joint 9 is arranged between the valve core sealing ring 7 and the valve seat 8, and is used for making the valve core sealing ring 7 contact with the valve core 5;

[0056] An adjustment mechanism is provided between the expansion joint 9 and the valve body 1 for adjusting the distance between the valve core sealing ring 7 and the valve core 5. Through the action of the expansion joint 9, the valve core sealing ring 7 can maintain close contact with the valve core 5. In the event of wear of the sealing ring 7, it can automatically compensate to ensure the sealing performance. At the same time, the expansion joint 9 can increase the adaptability of the device, compensate for dimensional changes caused by manufacturing tolerances or thermal expansion, and enhance the sealing reliability.

[0057] See also Figure 5 In some embodiments, a plurality of sealing grooves 73 are provided on the side of the valve core sealing ring 7 that contacts the inner wall of the valve body 1, and a sealing ring 74 is provided in the sealing groove 73. The sealing ring 74 is tightly filled in the sealing groove 73 to seal the valve core sealing ring 7 and the valve body 1;

[0058] The side of the valve core sealing ring 7 in contact with the valve core 5 is provided with a sealing ring groove 72, in which a sealing ring 71 is fixedly installed, and the inner side of the sealing ring groove 72 is arranged in a "V"-shaped surface, and the side of the sealing ring 71 in contact with the sealing ring groove 72 is arranged in a "V"-shaped mouth shape, so as to increase the sealing length of the contact surface;

[0059] The inner side "V"-shaped surface angle of the sealing ring groove 72 is V1, and the opening angle of the "V"-shaped opening of the sealing ring 71 is V2;

[0060] Among them, 45°≦V1 / V2≦135°, and 0°≦V2-V1≦5°;

[0061] The distance between the valve core sealing ring 7 and the side surface of the valve body 1 is H1, and the distance between the sealing ring 71 and the sealing ring groove 72 is H2;

[0062] Among them, 1mm≦H1 / H2≦5mm, and 0.5mm≦H2-H1≦2mm.

[0063] When in use, the effective length of the sealing surface is increased by the "V"-shaped sealing ring 71 and the sealing ring groove 72, thereby improving the sealing performance. When the valve core 5 is in a sealed state, the solution in the double eccentric hemispherical valve seal increases the pressure between the valve core 5 and the sealing ring 71, thereby helping to reduce the risk of leakage and improving the sealing performance of the double eccentric hemispherical valve.

[0064] By specifying the specific parameter ranges of the "V" angle (V1 / V2) and the extension distance (H1 / H2), these parameters are better adapted to the pressure requirements under different working conditions, ensuring that the sealing material is evenly distributed when subjected to force, thereby extending its service life.

[0065] See also Figure 6 In some embodiments, the regulating mechanism is composed of an elastic component, and the elastic component includes a spring 91 and a slide rod 92. The number of the slide rods 92 is two, and the two slide rods 92 are located between the expansion joint 9 and the inner wall of the valve body 1, and the two slide rods 92 are fixedly installed between the valve core sealing ring 7 and the valve seat 8 respectively;

[0066] The spring 91 is arranged on the two slide bars 92 , and the two ends of the spring 91 are fixedly connected to the valve core sealing ring 7 and the valve seat 8 respectively. The distance between the two slide bars 92 is H3 , wherein H3>H2 .

[0067] During use, when the valve is closed, the valve core 5 pushes the valve core sealing ring 7 and compresses the spring 91. The spring 91 is compressed to generate a pre-tightening force, so that the valve core 5 and the valve core sealing ring 7 can be tightly fitted. The continuous pre-tightening force provided by the spring 91 can effectively overcome the sealing failure problem caused by temperature changes, medium pressure fluctuations and other factors, and ensure long-term stable operation. The combined design of the spring 91 and the slide rod 92 simplifies the structure, reduces maintenance costs, and at the same time improves the response speed and operation convenience of the system.

[0068] In this embodiment, the elastic component can also be composed of spring discs, and multiple spring discs (91') are used to replace the original spring 91. These discs are usually disc-shaped, have good elasticity and fatigue resistance, can withstand large axial forces, and provide uniform pressure distribution. The spring discs 91' are also installed between the two slide bars 92, but unlike traditional springs, they are placed in a stacked manner, and the number of discs can be adjusted as needed to change the preload size. One end of each disc is fixed to the valve core sealing ring 7, and the other end is fixed to the valve seat 8.

[0069] Compared with springs, spring discs can provide greater compression force in a smaller space, and are particularly suitable for high-pressure working conditions. In addition, the disc design reduces the risk of deformation and ensures long-term stability and reliability. The spring disc can provide a more uniform pressure distribution during the compression process, which not only improves the fit between the sealing surfaces, but also extends the service life of the sealing material. By increasing or decreasing the number of discs or selecting discs of different specifications, the size of the preload can be easily adjusted to adapt to different working conditions and sealing requirements.

[0070] See also Figure 7-Figure 11 In some embodiments, the adjusting mechanism is composed of a pushing component, which includes a threaded rod 102, a threaded sleeve 101 is threadedly connected to the threaded rod 102, and connecting rods 103 are respectively connected to the two sides of the threaded sleeve 101, and the ends of the connecting rods 103 are respectively connected to connecting blocks 104, and the two connecting blocks 104 are respectively fixedly connected to the sealing ring 7 and the valve seat 8, one end of the threaded rod 102 is connected to a connecting rod 114, and the other end of the connecting rod 114 penetrates to the outside of the valve body 1 and is connected to the transmission box 11; when in use, the threaded rod 102 is driven to rotate by the connecting rod 114, and then the threaded sleeve 101 is driven to move on the threaded rod 102, which can drive the two connecting rods 103 to change their positions, thereby adjusting the relative distance between the valve core sealing ring 7 and the valve seat 8, and the connecting rod 114 extends the threaded rod 102 to the outside of the valve body and connects it to the turbine worm mechanism in the transmission box 11.

[0071] In this embodiment, a worm 112 is rotatably connected in the transmission box 11, and a turbine 111 is fixedly installed in the transmission box 11 on the connecting rod 114. The turbine 111 is meshed with the worm 112, and the worm 112 is connected to a handle 113 for driving the worm 112 to rotate and thus causing the turbine 114 to rotate. When in use, rotating the handle 113 will drive the worm 112 to rotate, thereby causing the turbine 111 and the connecting rod 114 to rotate together, and finally driving the threaded rod 102 to rotate, thereby completing the adjustment of the sealing device. The worm transmission method is adopted, which has a self-locking feature, prevents accidental loosening, and ensures stability after adjustment.

[0072] In this embodiment, the worm gear mechanism is replaced by an electric actuator (motor), which is directly mounted on the connecting rod 114. The internal motor drives the gears or other transmission components to realize the rotation of the threaded rod 102, thereby completing the adjustment of the sealing device. The electric actuator is also equipped with a built-in controller or an external PLC programming logic controller. The user can send instructions through a touch screen, a remote terminal, etc. for precise adjustment. Compared with the mechanical transmission method, the electric actuator can complete the start and stop actions in an instant, greatly improving the operating efficiency of the valve.

[0073] See also Figure 12-Figure 15 In some embodiments, the regulating mechanism is composed of a hydraulic mechanism, which includes a cylinder 13, a partition 132 is provided in the cylinder 13, one end of the cylinder 13 is fixedly mounted on the valve seat 8, and the other end is slidably connected with a slide rod 131, one end of the slide rod 131 sliding in the cylinder 13 is fixedly connected to the partition 132, and the other end of the slide rod 131 is fixedly connected to the sealing ring 7 for pushing the sealing ring 7 to move;

[0074] The partition 132 is used to divide the oil cylinder 13 into an oil inlet chamber or an oil outlet chamber, and is respectively provided with an oil inlet or an oil outlet, and the oil inlet or the oil outlet is respectively connected to the first oil pipe 125 and the second oil pipe 126, and the ends of the first oil pipe 125 and the second oil pipe 126 are connected to the electromagnetic reversing valve 124, and the electromagnetic reversing valve 124 is used to control the oil flow direction and drive the slide rod 131 to move axially, thereby changing the position of the valve core sealing ring 7. The hydraulic drive provides a strong driving force and can achieve a large stroke change in a short time, which is particularly suitable for large-caliber or high-pressure working conditions.

[0075] In this embodiment, the electromagnetic reversing valve 124 is installed in the fixed frame 12, and the fixed frame 12 is also fixedly installed with an oil tank 121. The oil tank 121 is connected to an oil pump 122, and the oil outlet of the oil pump 122 is connected to an oil pipe 123. The oil pipe 123 is connected to the reversing electromagnetic valve 124. The oil pump 122 draws hydraulic oil from the oil tank 121 and transports it to the electromagnetic reversing valve 124 through the oil pipe 123, and the latter distributes it to different oil circuits according to instructions to drive the oil pressure mechanism to work. The closed oil circuit design reduces the possibility of external pollution and ensures the cleanliness and reliability of the system.

[0076] See also Figure 1-Figure 2 In some embodiments, the sealing device is arranged in a ceramic double eccentric hemispherical valve, which also includes a valve body 1, a valve seat 8 and a valve core 5. The valve core 5 is arranged in a hemispherical shape. The upper and lower ends of the valve core 5 are respectively connected to an upper valve core bearing 21 and a lower valve core bearing 2. The upper valve core bearing 21 is connected with a valve stem 22 for driving the valve core 5 to rotate between the upper valve core bearing 21 and the lower valve core bearing 2. The lower valve core bearing 2 is fixedly installed at the bottom of the valve body 1 by screws or screws;

[0077] The inlet and outlet on both sides of the valve body 1 are provided with a first connecting flange 4, which is connected to the pipeline by bolts. The valve stem 22 is connected to the driving mechanism through a second flange 41, and the driving mechanism is driven by a motor or a worm gear to drive the valve stem 22 to rotate.

[0078] In this embodiment, the inner wall of the valve body 1 is fixedly mounted with a valve body core 3 by bolts or screws, and the arc-shaped end of the valve core 5 is mounted with a sealing pressure plate 6, and the sealing pressure plate 6 is fixedly mounted on the valve core 5 by a first bolt 61;

[0079] The valve seat 8 is fixedly installed on one side of the valve body 1 , and the valve seat 8 is fixedly installed on the valve seat 1 by a second bolt 81 .

[0080] In this embodiment, the valve body inner core 3 and the valve core 5 are both made of ceramic material. The application of ceramic material not only improves the durability and corrosion resistance of the valve, but also reduces the resistance during the flow of the medium, improves the fluid transmission efficiency, performs well under high temperature and high pressure conditions, reduces the deformation or damage problems that may occur in traditional metal materials, and ensures long-term stable operation.

[0081] When a ceramic double eccentric hemispherical valve is in use, the valve stem 22 is rotated by operating a motor, a worm gear or other forms of driving mechanism, thereby driving the valve core 5 to rotate along its axis. As the valve core 5 rotates, the valve core sealing ring 7 can move accordingly in the valve body due to its sliding design to adapt to the position change of the valve core 5 and maintain contact with the valve core 5. The double eccentric design makes the contact angle between the valve core sealing ring 7 and the valve core 5 smaller than the friction angle, which helps to achieve a self-locking function and maintain the sealing in the closed state even without an external power source.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0083] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A ceramic double eccentric hemispherical valve sealing device, which is arranged between the valve seat and the valve core of the double eccentric hemispherical valve and is used for sealing between the valve seat and the valve core, characterized in that: The sealing device comprises a valve core sealing ring, which is arranged on the valve body and slides in the valve body, and an expansion joint is arranged between the valve core sealing ring and the valve seat to make the valve core sealing ring contact with the valve core; An adjusting mechanism is arranged between the expansion joint and the valve body, and is used for adjusting the distance between the valve core sealing ring and the valve core.

2. A ceramic double eccentric hemispherical valve sealing device according to claim 1, characterized in that: A plurality of sealing grooves are provided on the side of the valve core sealing ring that contacts the inner wall of the valve body, and a sealing ring is provided in the sealing groove to seal the valve core sealing ring and the valve body; A sealing ring groove is provided on the side of the valve core sealing ring that contacts the valve core, a sealing ring is fixedly installed in the sealing ring groove, the inner side of the sealing ring groove is arranged in a "V"-shaped surface, and the side of the sealing ring that contacts the sealing ring groove is arranged in a "V"-shaped mouth shape, so as to increase the sealing length of the contact surface; The "V"-shaped surface angle inside the sealing ring groove is V1, and the "V"-shaped opening angle of the sealing ring is V2; Among them, 45°≦V1 / V2≦135°, and 0°≦V2-V1≦5°; The distance between the valve core sealing ring and the side of the valve body is H1, and the distance between the sealing ring and the sealing ring groove is H2; Among them, 1mm≦H1 / H2≦5mm, and 0.5mm≦H2-H1≦2mm.

3. A ceramic double eccentric hemispherical valve sealing device according to claim 2, characterized in that: The regulating mechanism is composed of an elastic component, which includes a spring and a slide rod. There are two slide rods, which are located between the expansion joint and the inner wall of the valve body, and are fixedly installed between the valve core sealing ring and the valve seat respectively. The spring is arranged on the two sliding rods, and the two ends of the spring are fixedly connected to the valve core sealing ring and the valve seat respectively. The distance between the two sliding rods is H3, wherein H3>H2.

4. A ceramic double eccentric hemispherical valve sealing device according to claim 1, characterized in that: The adjusting mechanism is composed of a pushing assembly, which includes a threaded rod, a threaded sleeve is threadedly connected to the threaded rod, connecting rods are respectively connected to both sides of the threaded sleeve, and the ends of the connecting rods are respectively connected to connecting blocks, and the two connecting blocks are respectively fixedly connected to the sealing ring and the valve seat, one end of the threaded rod is connected to the connecting rod, and the other end of the connecting rod passes through the outside of the valve body and is connected to the transmission box.

5. A ceramic double eccentric hemispherical valve sealing device according to claim 4, characterized in that: A worm is rotatably connected in the transmission box, a turbine is fixedly installed on the connecting rod in the transmission box, the turbine is meshed with the worm, and the worm is connected to a handle for driving the worm to rotate so as to rotate the turbine.

6. A ceramic double eccentric hemispherical valve sealing device according to claim 1, characterized in that: The regulating mechanism is composed of a hydraulic mechanism, which includes an oil cylinder, a partition is arranged in the oil cylinder, one end of the oil cylinder is fixedly installed on the valve seat, and the other end is slidably connected with a slide rod, one end of the slide rod sliding in the oil cylinder is fixedly connected to the partition, and the other end of the slide rod is fixedly connected to the sealing ring for pushing the sealing ring to move; The partition is used to divide the oil cylinder into an oil inlet chamber or an oil outlet chamber, and is respectively provided with an oil inlet or an oil outlet, the oil inlet or the oil outlet is respectively connected to a first oil pipe and a second oil pipe, and the ends of the first oil pipe and the second oil pipe are connected to an electromagnetic reversing valve.

7. A ceramic double eccentric hemispherical valve sealing device according to claim 6, characterized in that: The electromagnetic reversing valve is installed in a fixed frame, and an oil tank is also fixedly installed in the fixed frame. The oil tank is connected to an oil pump, and the oil outlet of the oil pump is connected to an oil pipeline, and the oil pipeline is connected to the reversing electromagnetic valve.

8. A ceramic double eccentric hemispherical valve, comprising the ceramic double eccentric hemispherical valve sealing device according to any one of claims 1 to 7, characterized in that: It also includes a valve body, a valve seat and a valve core, the valve core is arranged in a hemispherical shape, the upper and lower ends of the valve core are respectively connected to an upper valve core bearing and a lower valve core bearing, the upper valve core bearing is connected to a valve stem for driving the valve core to rotate between the upper valve core bearing and the lower valve core bearing, and the lower valve core bearing is fixedly installed at the bottom of the valve body by a screw or a screw; A first connecting flange is provided at the inlet and outlet on both sides of the valve body. The first connecting flange is connected to the pipeline under the action of bolts. The valve stem is connected to the driving mechanism through a second flange. The driving mechanism is driven by a motor or a worm gear to drive the valve stem to rotate.

9. A ceramic double eccentric hemispherical valve according to claim 8, characterized in that: The inner wall of the valve body is fixedly mounted with a valve body inner core by bolts or screws, and the arc-shaped end of the valve core is mounted with a sealing pressure plate, and the sealing pressure plate is fixedly mounted on the valve core by a first bolt; The valve seat is fixedly installed on one side of the valve body, and the valve seat is fixedly installed on the valve seat by a second bolt.

10. A ceramic double eccentric hemispherical valve according to claim 9, characterized in that: The inner core of the valve body and the valve core are both made of ceramic material.

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