Two-way multi-excentric hard sealing butterfly valve

Abstract

The utility model discloses a bidirectional multi eccentric hard sealing butterfly valve, including left valve body, right valve body, valve core, drive mechanism, sealing structure, valve core is connected with left valve body through sealing structure, and forms sealing pair when valve core and left valve body contact, the upper and lower sides of valve core are connected with upper valve shaft, lower valve shaft respectively, upper valve shaft, lower valve shaft all are rotatoryly connected with right valve body, and left valve body is installed on right valve body, the output of drive mechanism is connected with upper valve shaft, and the rotation center of valve core deviates from own geometric center. The hard sealing rotary ball valve structure of this application is compact, and the installation is light, and has fused the appearance structure of butterfly valve and the sealing principle of ball valve, has the advantages such as small size, light weight, has reduced the installation space demand and transportation and installation cost significantly.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a bidirectional multi-eccentric hard-seal butterfly valve. Background Technology

[0002] In current pipeline systems, valves are widely used as key components for controlling the flow and regulation of media. Traditional one-way sealing valves require two valves to work together in bidirectional pressure systems to achieve bidirectional sealing, which not only increases equipment costs and pipeline installation space, but also results in more connection points and a higher risk of leakage.

[0003] Existing hard-seal butterfly valves, ball valves, and eccentric hemispherical valves have many shortcomings. Some valves are large and heavy, making installation and maintenance inconvenient; some valves have unreasonable sealing structure designs, resulting in high sealing friction, easy wear, short service life, and difficulty in achieving reliable bidirectional sealing; some valves have internal components such as pressure plates and bolts, which are prone to bolt loosening and pressure plate corrosion after long-term use, leading to sealing failure, or even component detachment and damage to related equipment such as water pumps and fans, affecting the stable operation of the entire pipeline system.

[0004] Therefore, developing a valve that is small in size, light in weight, has reliable bidirectional sealing, is wear-resistant, durable, and highly safe has become an urgent technical problem to be solved in this field. Utility Model Content

[0005] In view of this, the present invention aims to propose a bidirectional multi-eccentric hard-seal butterfly valve to solve at least one technical problem in the background art.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A bidirectional, multi-eccentric hard-seal butterfly valve, comprising a left valve body, a right valve body, a valve core, a drive mechanism, and a sealing structure; The valve core is connected to the left valve body through a sealing structure, and a sealing pair is formed when the valve core contacts the left valve body. The upper and lower sides of the valve core are connected to the upper valve shaft and the lower valve shaft respectively; both the upper and lower valve shafts are rotatably connected to the right valve body, and the left valve body is installed on the right valve body; The output end of the drive structure is connected to the upper valve shaft, and the rotation center of the valve core is offset from its own geometric center.

[0007] Furthermore, the upper valve shaft and the right valve body are connected by a bearing.

[0008] Furthermore, a locking block is provided on one side of the right valve body, and a groove corresponding to the locking block is provided on the left valve body. The left and right valve bodies are connected by a locking block, which is equipped with a high-temperature gasket.

[0009] Furthermore, the sealing structure includes a sealing block; a sealing seat is provided on the valve core, and a sealing block is provided on the sealing seat, with the sealing block positioned at the connection between the valve core and the left valve body; a metal pressure plate is provided on the left valve body, with the metal pressure plate positioned at the connection between the valve core and the left valve body; the connection between the left valve body and the valve core is sealed by the sealing block.

[0010] Furthermore, the high-temperature gasket is an inclined plate, and the sealing block has an inclined surface corresponding to the inclined surface of the high-temperature gasket.

[0011] Furthermore, the bottom bolts of the right valve body are equipped with a bottom cover.

[0012] Furthermore, the extended end of the upper valve shaft is provided with a stuffing box structure, the stuffing box structure including a stuffing gland disposed between the upper valve shaft and the right valve body.

[0013] Furthermore, an upper bushing is provided between the upper valve shaft and the right valve body; A lower bushing is provided between the lower valve shaft and the right valve body.

[0014] Furthermore, the valve body has a disc-shaped structure.

[0015] Compared with the prior art, the bidirectional multi-eccentric hard-seal butterfly valve of this utility model has the following advantages: 1. Under forward pressure, the medium pressure pushes the valve core forward, causing its sealing surface to tightly adhere to the inclined surface of the valve seat, forming a reliable seal. Under reverse pressure, the medium pressure pushes the valve seat to move, causing its sealing surface to tightly adhere to the valve core, achieving the same effective seal. A single valve can meet the needs of a bidirectional pressure system and can replace two ordinary one-way sealing valves.

[0016] 2. The bidirectional flow hard-seal rotary ball valve of this application has a compact structure and is easy to install. It combines the shape and structure of a butterfly valve with the sealing principle of a ball valve, and has the advantages of small size and light weight, which significantly reduces the installation space requirements and transportation and installation costs.

[0017] 3. The bidirectional flow hard seal rotary ball valve of this application is wear-resistant, durable, and has a long service life. The sealing pair formed by the valve core and the valve seat is precisely matched and has a high degree of fit. There is little friction between the sealing surfaces, and it has self-adaptive center positioning and wear compensation functions, thereby effectively extending its service life.

[0018] 4. The bidirectional flow hard-seal rotary ball valve of this application is safe to operate and has stable performance. There are no pressure plates, bolts or other easily damaged connecting parts inside the valve, which effectively avoids the sealing failure caused by loose or corroded internal parts. At the same time, it also eliminates the risk of parts falling off and damaging related equipment, and ensures the long-term stable operation of the pipeline system.

[0019] 5. The bidirectional flow hard-seal rotary ball valve of this application is comprehensive in function and cost-effective, and its overall performance surpasses that of traditional hard-seal butterfly valves, ball valves, and eccentric hemispherical valves. It has a wide range of applications, combines shut-off and regulation functions, and has low flow resistance, easy opening and closing, and extremely high overall cost-effectiveness. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the bidirectional multi-eccentric hard-seal butterfly valve proposed in this utility model; Figure 2 The present utility model proposes Figure 1 A magnified view of part B in the image; Figure 3 The present utility model proposes Figure 1 Schematic diagram of section AA.

[0021] Explanation of reference numerals in the attached figures: 1. Left valve body; 2. Right valve body; 3. Valve core; 4. Drive mechanism; 5. Upper valve shaft; 6. Lower valve shaft; 7. Clamping block; 8. Groove; 9. High-temperature gasket; 10. Sealing block; 11. Metal pressure plate; 12. Bottom cover; 14. Packing gland; 15. Upper bushing; 16. Lower bushing; 17. Sealing seat. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1 A bidirectional, multi-eccentric hard-seal butterfly valve includes a left valve body 1, a right valve body 2, a valve core 3, a drive mechanism 4, and a sealing structure. The valve core 3 is connected to the left valve body 1 through the sealing structure, and a sealing pair is formed when the valve core 3 contacts the left valve body 1. The upper and lower sides of the valve core 3 are respectively connected to the upper valve shaft 5 and the lower valve shaft 6. Both the upper valve shaft 5 and the lower valve shaft 6 are rotatably connected to the right valve body 2, and the left valve body 1 is mounted on the right valve body 2. The output end of the drive structure is connected to the upper valve shaft 5, and the rotation center of the valve core 3 is offset from its own geometric center.

[0027] The upper valve shaft 5 and the right valve body 2 are connected by a bearing.

[0028] A locking block 7 is provided on one side of the right valve body 2, and a groove 8 corresponding to the locking block 7 is provided on the left valve body 1. The left valve body 1 and the right valve body 2 are connected by the locking block 7, and a high-temperature gasket 9 is provided on the locking block 7.

[0029] The sealing structure includes a sealing block 10; a sealing seat 17 is provided on the valve core 3, and a sealing block 10 is provided on the sealing seat 17. The sealing block 10 is located at the connection between the valve core 3 and the left valve body 1; a metal pressure plate 11 is provided on the left valve body 1, and the metal pressure plate 11 is located at the connection between the valve core 3 and the left valve body 1; the connection between the left valve body 1 and the valve core 3 is sealed by the sealing block 10. The pressure gasket is an inclined plate, and the sealing block 10 has an inclined surface corresponding to the inclined surface of the high-temperature gasket 9.

[0030] The bottom bolts of the right valve body 2 are fitted with a bottom cover 12. The extended end of the upper valve shaft 5 is provided with a stuffing box structure, which includes a stuffing gland 14 disposed between the upper valve shaft 5 and the right valve body 2. An upper sleeve 15 is provided between the upper valve shaft 5 and the right valve body 2; a lower sleeve 16 is provided between the lower valve shaft 6 and the right valve body 2. The valve body has a disc structure.

[0031] Example 2 For valve body assembly and sealing, firstly, the right valve body 2 is fixed onto the assembly fixture. A retaining block 7 is cast on one side of the valve body, and a high-temperature gasket 9 (preferably an inclined plate structure) is pre-placed on the retaining block 7.

[0032] Subsequently, the left valve body 1 is precisely aligned and engaged with the locking block 7 of the right valve body 2 via its groove 8. Utilizing the inclined surface fit between the locking block 7 and the groove 8, along with the elastic deformation of the high-temperature gasket 9, a pre-tight seal is achieved between the left and right valve bodies 2, forming the first reliable middle flange seal.

[0033] The valve core 3 assembly is mounted with the bearing. During the machining of the valve core 3, a metal pressure plate 11 is machined and fixed to the upper valve shaft 5 and the lower valve shaft 6 to form the valve core 3 assembly. The rotation center of the valve core 3 is offset from its own geometric center, forming an eccentric structure, which is the key to reducing friction when the valve is opened and closed.

[0034] The valve core 3 assembly is inserted into the cavity of the right valve body 2 from top to bottom. The upper valve shaft 5 and the lower valve shaft 6 form rotational supports with the right valve body 2 through the upper bushing 15 and the lower bushing 16, respectively. This ensures that the valve core 3 can rotate freely within the cavity without radial movement.

[0035] A sealing seat 17 and a sealing block 10 are installed on the sealing surface of the valve core 3. The sealing block 10 is preferably made of a wear-resistant and corrosion-resistant flexible material (such as reinforced polytetrafluoroethylene or metal composite material), and it can be machined with a beveled surface that matches the high-temperature gasket 9 to form a coordinated sealing force.

[0036] A metal pressure plate 11 is installed at the contact position between the left valve body 1 and the valve core 3 to protect and position the sealing contact surface. When the left and right valve bodies 2 are closed, the sealing surface of the valve core 3 is precisely aligned with the sealing structure (sealing block 10, metal pressure plate 11) on the left valve body 1, forming the aforementioned sealing pair that can achieve bidirectional sealing.

[0037] The drive mechanism 4 (such as a worm gear, electric or pneumatic actuator, the drive mechanism 4 adopts existing technology) is fixed to the upper end of the right valve body 2 by a flange or bracket, and its output end is connected to the extended end of the upper valve shaft 5 by a key or tenon to transmit torque.

[0038] A stuffing box structure is installed between the protruding end of the upper valve shaft 5 and the right valve body 2. This structure includes the inserted sealing packing (such as graphite packing) and a packing gland 14 that compresses the packing. By evenly tightening the bolts of the packing gland 14, a dynamic seal can be achieved at the valve stem to prevent media leakage.

[0039] Finally, the bottom cover 12 is bolted to the bottom of the right valve body 2. The bottom cover 12 serves both to support and protect the lower valve shaft 6, and also facilitates daily maintenance and internal cleaning.

[0040] After valve assembly, the following tests must be performed sequentially: Strength test: Tests the pressure-bearing capacity of the valve body and the middle flange seal. Bidirectional sealing test: Apply a specified pressure of medium to both the valve inlet (left valve body 1 side) and outlet (right valve body 2 side) to verify its sealing performance under forward and reverse pressure, ensuring zero leakage. Opening and closing torque test: Verifies whether the opening and closing torque of the drive mechanism 4 is smooth and easy under rated pressure.

[0041] When under forward pressure (the medium flows in from the left valve body 1), the medium pressure pushes the entire valve core 3 to move towards the left valve body 1, causing the sealing surface on the valve core 3 to press tightly against the sealing slope of the left valve body 1, thus achieving a seal. At this time, the sealing slope of the left valve body 1 acts as a valve seat.

[0042] When reverse pressure is applied (the medium flows in from the right valve body 2), the medium pressure pushes the "valve seat" to move. Here, "valve seat" refers to the sealing part that mates with the valve core 3. Since the left valve body 1 is fixedly installed on the pipeline, it cannot be moved. Therefore, what can be moved and is called the "valve seat" is only the sealing structure assembly (i.e., the integral part consisting of the sealing seat 17 and the sealing block 10) installed on the valve core 3.

[0043] The valve body is made of materials such as carbon steel (e.g., WCB) and stainless steel (e.g., CF8, CF8M). These materials have good strength and corrosion resistance, ensuring the stability of the valve body during long-term use. The valve body is manufactured using integral casting or forging processes to ensure its strength and sealing performance. To avoid using standard parts, all connection points and mounting holes of the valve body require special design.

[0044] The valve shaft is made of high-strength, corrosion-resistant materials, such as stainless steel or alloy steel. Advanced machining processes ensure the precision and surface quality of the valve shaft. A special fixing method is used to connect the valve shaft to the valve body, avoiding the use of standard cylindrical pins and other connecting parts.

[0045] The shape and size of the valve core's disc need to be designed according to the valve body's flow path and sealing requirements. To ensure good sealing performance, the surface of the valve core's disc needs to be machined with high precision to ensure a perfect fit with the valve seat's sealing surface. Simultaneously, the thickness and strength of the valve core's disc also need to be rationally designed based on the valve's working pressure and media characteristics to ensure that it will not deform or be damaged during use.

[0046] The material of the butterfly plate should have good wear resistance, corrosion resistance, and strength. Common materials include stainless steel and alloy steel. Under some special working conditions, the surface of the butterfly plate is sprayed or overlaid with alloy materials to improve its surface hardness and wear resistance.

[0047] When the valve is closed, the valve core presses directly against the valve seat through the action of multiple eccentricities, achieving a seal. At the same time, the valve plate has no pressure plate, movable valve seat, or standard parts, which allows the valve to achieve zero leakage even under harsh operating conditions such as high pressure and high temperature.

[0048] Appropriate surface treatments are applied to valve bodies, valve shafts, valve cores, and other components to improve their corrosion resistance and wear resistance. Common surface treatment methods include galvanizing, chrome plating, and spraying. For the metal surfaces of sealing components, alloy materials are sprayed onto them to improve their hardness and wear resistance, thereby extending the service life of the sealing components.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bidirectional multi-eccentric hard-seal butterfly valve, characterized in that: Includes left valve body, right valve body, valve core, drive mechanism, and sealing structure; The valve core is connected to the left valve body through a sealing structure, and a sealing pair is formed when the valve core contacts the left valve body. The upper and lower sides of the valve core are connected to the upper valve shaft and the lower valve shaft respectively; both the upper and lower valve shafts are rotatably connected to the right valve body, and the left valve body is installed on the right valve body; The output end of the drive structure is connected to the upper valve shaft, and the rotation center of the valve core is offset from its own geometric center.

2. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: The upper valve shaft is connected to the right valve body via a bearing.

3. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: A locking block is provided on one side of the right valve body, and a corresponding groove is provided on the left valve body. The left and right valve bodies are connected by a locking block, which is equipped with a high-temperature gasket.

4. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: The sealing structure includes a sealing block; The valve core is provided with a sealing seat, and the sealing seat is provided with a sealing block. The sealing block is located at the connection between the valve core and the left valve body. A metal pressure plate is provided on the left valve body, and the metal pressure plate is located at the connection between the valve core and the left valve body; The connection between the left valve body and the valve core is sealed by a sealing block.

5. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 4, characterized in that: The high-temperature gasket is an inclined plate; The sealing block has a bevel that corresponds to the bevel of the high-temperature gasket.

6. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: The bottom bolts of the right valve body are fitted with a bottom cover.

7. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: The extended end of the upper valve shaft is provided with a stuffing box structure, which includes a stuffing gland disposed between the upper valve shaft and the right valve body.

8. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: An upper shaft sleeve is provided between the upper valve shaft and the right valve body; A lower bushing is provided between the lower valve shaft and the right valve body.

9. The bidirectional multi-eccentric hard-seal butterfly valve according to claim 1, characterized in that: The valve body has a disc-shaped structure.

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