Double-seal butterfly valve

Abstract

The utility model relates to a double-seal butterfly valve, which comprises a valve body and a valve rod, the valve rod is rotatably arranged in the valve body, the valve rod is detachably and fixedly connected with a butterfly plate, and the butterfly plate is arranged in the valve body and is matched with the inner wall of the valve body; sealing rings are detachably and fixedly connected to the edges of the two sides of the butterfly plate respectively, when the butterfly plate is closed, the sealing rings abut against the inner wall of the opening of the valve body, the gas and water working conditions meeting the high-reliability sealing requirement are achieved, the service life of the butterfly valve is prolonged, and the use cost of the valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealed butterfly valves, in particular to a double-sealed butterfly valve. Background Art

[0002] Single-seal butterfly valves are control elements used to regulate or cut off media in fluid pipeline systems. They are widely used in metallurgy, mining, electric power, petroleum, chemical industry, textile, environmental protection, urban construction, shipbuilding, food, medicine, and national defense research.

[0003] However, single-seal butterfly valves have the following major drawbacks when used in gas and water working conditions that require high-reliability sealing: Although single-seal butterfly valves can meet general sealing requirements, their sealing performance is often difficult to meet standards in situations where high-reliability sealing is required, which may cause gas or water leakage and affect the stability and efficiency of the system. Due to the limitations of sealing performance, single-seal butterfly valves may require more frequent maintenance and replacement under high-requirement working conditions, which not only increases maintenance costs, but also shortens the service life of the valve, thereby increasing the overall cost of use. In order to address the shortcomings of single-seal butterfly valves under high sealing requirements, ball valves are usually selected as an alternative. However, compared with butterfly valves, ball valves have larger dimensions and weight, which not only increases the demand for installation space, but also may bring additional cost burdens, such as transportation and installation costs. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a double-seal butterfly valve that meets the gas and water working conditions with high reliability sealing requirements, extends the service life of the butterfly valve, and reduces the cost of using the valve.

[0005] The above-mentioned utility model object of the present invention is achieved through the following technical solutions:

[0006] A double-seal butterfly valve comprises a valve body and a valve stem, wherein the valve stem is rotatably disposed in the valve body, a butterfly plate is detachably fixedly connected to the valve stem, and the butterfly plate is disposed in the valve body and cooperates with the inner wall thereof;

[0007] The edges of both sides of the butterfly plate are respectively detachably and fixedly connected with sealing rings. When the butterfly plate is closed, the sealing rings are pressed against the inner wall of the opening of the valve body.

[0008] As a further technical solution of the present invention: the left edge of the butterfly plate is detachably fixedly connected with a left sealing ring, and the right edge of the butterfly plate is detachably fixedly connected with a right sealing ring, and the left sealing ring and the right sealing ring are symmetrical about the center line axis of the valve body.

[0009] As a further technical solution of the present invention: pressure rings are detachably fixed to the edges of both sides of the butterfly plate, and the pressure rings are used to fix the sealing ring on the butterfly plate.

[0010] As a further technical solution of the present invention: a fastener is provided on the pressure ring, and the fastener fastens the pressure ring to the butterfly plate.

[0011] As a further technical solution of the present invention: the fastener is a screw, the screw is threadedly connected to the pressure ring, and one end of the screw passes through the pressure ring and is threadedly connected to the butterfly plate.

[0012] As a further technical solution of the present invention: a first groove is provided on the edge of the pressure ring close to the sealing ring, and second grooves opposite to the first groove are provided on the edges of both sides of the butterfly plate. The first groove and the second groove form a limiting ring groove, and a limiting block matching the limiting ring groove is integrally formed and fixedly connected to the sealing ring.

[0013] As a further technical solution of the present invention: the edge of the sealing ring gradually shrinks toward the center to form a protrusion, and the protrusion is pressed against the inner wall of the valve body.

[0014] In summary, the present invention has at least one of the following beneficial technical effects:

[0015] 1. The utility model relates to a double-seal butterfly valve, which forms a double sealing structure by detachably fixing and connecting sealing rings on the edges of both sides of the butterfly plate, thereby increasing the contact area and pressure distribution of the sealing surface, thereby improving the sealing effect and the sealing performance of the butterfly valve in the closed state, ensuring that gas or liquid will not leak from the valve body opening, meeting the gas and water working conditions with high reliability sealing requirements, extending the service life of the valve, reducing the cost caused by frequent maintenance and replacement, and making it suitable for more occasions with high sealing requirements.

[0016] 2. The utility model relates to a double-seal butterfly valve, in which a first groove is provided on the edge of the pressure ring close to the sealing ring, and second grooves opposite to the first groove are provided on the edges of both sides of the butterfly plate. The first groove and the second groove form a limiting ring groove, and a limiting block matching the limiting ring groove is integrally formed and fixedly connected to the sealing ring. When the sealing ring is installed in place, the limiting block is clamped by the limiting ring groove, thereby achieving stable fixation and sealing of the sealing ring, ensuring that the sealing ring can be accurately positioned during installation, and preventing leakage caused by misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2This is a schematic structural diagram of the fastener of the present utility model;

[0019] Figure numerals: 1, bottom cover; 2, valve body; 3, sealing ring; 31, limit block; 32, protrusion; 33, left sealing ring; 34, right sealing ring; 4, butterfly plate; 41, first groove; 42, second groove; 43, limit ring groove; 5, pressure ring; 51, fastener; 52, mounting hole; 53, screw; 6, valve stem. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0021] Example 1:

[0022] like Figure 1 A double-seal butterfly valve includes a valve body 2, a valve stem 6 and a bottom cover 1. The valve stem 6 is rotatably arranged in the valve body 2. The valve stem 6 is detachably fixedly connected to a butterfly plate 4. The butterfly plate 4 is arranged in the valve body 2 and cooperates with its inner wall. The edges on both sides of the butterfly plate 4 are detachably fixedly connected with sealing rings 3. When the butterfly plate 4 is closed, the sealing ring 3 is tightly pressed against the inner wall of the opening of the valve body 2.

[0023] By detachably fixing the sealing ring 3 on the edges of both sides of the butterfly plate 4, when the butterfly plate 4 closes the opening of the valve body 2, the sealing ring 3 is tightly pressed against the inner wall of the valve body 2 to form a double sealing structure, which increases the contact area and pressure distribution of the sealing surface, thereby improving the sealing effect and the sealing performance of the butterfly valve in the closed state, ensuring that gas or liquid will not leak from the opening of the valve body 2, meeting the gas and water working conditions with high reliability sealing requirements, extending the service life of the valve, and reducing the cost caused by frequent maintenance and replacement, so that it can adapt to more occasions with high sealing requirements.

[0024] A left sealing ring 33 is detachably fixedly connected to the left edge of the butterfly disc 4, and a right sealing ring 34 is detachably fixedly connected to the right edge of the butterfly disc 4. The left and right sealing rings 33 and 34 are symmetrical about the centerline of the valve body 2. The symmetrical design of the left and right sealing rings 33 and 34 about the centerline of the valve body 2 ensures that the sealing rings 3 on both sides are subjected to the same force during the rotation of the butterfly disc 4, thereby ensuring a uniform sealing effect and preventing leakage caused by uneven force.

[0025] The edges of both sides of the butterfly plate 4 are detachably fixed with pressure rings 5, which are used to fix the sealing ring 3 to the butterfly plate 4. The pressure ring 5 presses the sealing ring 3 tightly against the butterfly plate 4, and uses the physical pressure of the pressure ring 5 to fix the sealing ring 3, so that the sealing ring 3 can maintain a stable position and shape during use, preventing it from falling off or shifting during use and causing leakage, thereby improving the reliability and durability of the entire valve.

[0026] like Figure 2 The pressing ring 5 is provided with a fastener 51, which fastens the pressing ring 5 to the butterfly plate 4. The fastener 51 is preferably a screw 53. One end of the screw 53 passes through the pressing ring 5 and is threaded into the butterfly plate 4. The circumferential edge of the pressing ring 5 is provided with a plurality of mounting holes 52 that match the screws. One end of the screw 53 is screwed into the butterfly plate 4 through the mounting holes 52. The pressing ring 5 is firmly fixed to the butterfly plate 4 to ensure that the sealing ring 3 maintains stable sealing performance even under extreme working conditions and prevents it from loosening under high pressure or vibration environments.

[0027] A first groove 41 is provided on the edge of the pressure ring 5 close to the sealing ring 3, and a second groove 42 opposite to the first groove 41 is provided on the edges of both sides of the butterfly plate 4. The first groove 41 and the second groove 42 form a limiting ring groove 43. A limiting block 31 matching the limiting ring groove 43 is integrally formed and fixedly connected to the sealing ring 3. When the sealing ring 3 is installed in place, the limiting block 31 is clamped by the limiting ring groove 43, thereby achieving stable fixation and sealing of the sealing ring 3, ensuring that the sealing ring 3 can be accurately positioned during the installation process to prevent leakage caused by misalignment.

[0028] The edge of the sealing ring 3 gradually shrinks toward the center to form a protrusion 32, which presses tightly against the inner wall of the valve body 2. When the butterfly plate 4 is closed, these protrusions 32 can press more tightly against the inner wall of the valve body 2, thereby increasing the contact pressure between the sealing ring 3 and the inner wall of the valve body 2 and improving the sealing effect, reducing the risk of leakage, and forming a more effective sealing structure.

[0029] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A double-sealed butterfly valve, comprising a valve body (2) and a valve stem (6), wherein the valve stem (6) is rotatably disposed within the valve body (2), a butterfly plate (4) is detachably fixedly connected to the valve stem (6), and the butterfly plate (4) is disposed within the valve body (2) and engages with the inner wall thereof; It is characterized by: The edges of both sides of the butterfly plate (4) are respectively detachably fixedly connected with sealing rings (3); when the butterfly plate (4) is closed, the sealing rings (3) press against the inner wall of the opening of the valve body (2).

2. A double-seal butterfly valve according to claim 1, characterized in that: The left edge of the butterfly plate (4) is detachably fixedly connected to a left sealing ring (33), and the right edge of the butterfly plate (4) is detachably fixedly connected to a right sealing ring (34), wherein the left sealing ring (33) and the right sealing ring (34) are symmetrical about the center line of the valve body (2).

3. A double-seal butterfly valve according to claim 2, characterized in that: The edges of both sides of the butterfly plate (4) are respectively detachably fixed with pressure rings (5), and the pressure rings (5) are used to fix the sealing ring (3) on the butterfly plate (4).

4. A double-seal butterfly valve according to claim 3, characterized in that: The pressing ring (5) is provided with a plurality of fasteners (51), and the plurality of fasteners (51) fasten the pressing ring (5) to the butterfly plate (4).

5. A double-seal butterfly valve according to claim 4, characterized in that: The fastener (51) is a screw (53), and the screw (53) is threadedly connected to the pressure ring (5). One end of the screw (53) passes through the pressure ring (5) and is threadedly connected to the butterfly plate (4).

6. A double-seal butterfly valve according to claim 5, characterized in that: A first groove (41) is provided on the edge of the pressure ring (5) close to the sealing ring (3), and a second groove (42) opposite to the first groove (41) is provided on the edges of both sides of the butterfly plate (4). The first groove (41) and the second groove (42) form a limiting ring groove (43), and a limiting block (31) matching the limiting ring groove (43) is integrally formed and fixedly connected to the sealing ring (3).

7. A double-seal butterfly valve according to claim 6, characterized in that: The edge of the sealing ring (3) gradually shrinks toward the center to form a protrusion (32), and the protrusion (32) is pressed against the inner wall of the valve body (2).

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