Double-seal butterfly valve capable of preventing pressing ring screw from loosening

Abstract

The utility model relates to a double-seal butterfly valve capable of preventing a pressing ring screw from loosening, 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 fixed to the edges of the two sides of the butterfly plate respectively, pressing rings detachably and fixedly connected with the butterfly plate are arranged on the outer sides of the sealing rings, and the pressing rings are used for fixing the sealing rings to the butterfly plate. A plurality of fastening pieces and a plurality of supporting pieces are detachably fixed to the peripheral side of the pressing ring, the fastening pieces are used for detachably fixing the pressing ring to the butterfly plate, the supporting pieces are detachably fixed to the pressing ring, and one ends of the supporting pieces abut against the outer side of the butterfly plate. Deformation or looseness of the pressing ring caused by medium pressure or vibration is prevented, and the situation that the performance of the double-sealing butterfly plate is affected and safety accidents occur due to the fact that the screws are prone to loosening, falling off and falling into a pipeline is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing butterfly plates, in particular to a double-sealing butterfly valve which can prevent a pressure ring screw from loosening. Background Art

[0002] The butterfly plate, also known as the flap valve, is a control element used to regulate or cut off the medium in the fluid pipeline system. It has good wear resistance, corrosion resistance and safety. It is widely used in metallurgy, mining, electric power, petroleum, chemical industry, light industry, environmental protection, urban construction, shipbuilding, food, medicine and national defense research.

[0003] In the existing technology, such as the Chinese patent with publication number CN103574075A, it discloses a soft-sealed telescopic butterfly valve, including a valve body, a valve stem installed in the valve body, a packing gland between the valve stem and the valve body, a valve plate connected to the valve stem, a soft sealing gasket between the valve plate and the valve body, the soft sealing gasket fixed inside the valve body, valve body flanges on both sides of the valve body, a telescopic tube movably connected to an axially movable inner cavity of one side of the valve body, a telescopic tube flange is provided on the outer side of the telescopic tube away from the valve body along the circumferential direction, a pressure ring and a rubber ring are provided at the contact point between the outer side of the telescopic tube and the valve body, the pressure ring fixes the rubber ring between the telescopic tube and the valve body by fixing screws, the telescopic tube flange and the valve body flange are fixed by bolts, and the inner wall of one end of the telescopic tube located inside the valve body is an inclined surface. The soft-sealed telescopic butterfly valve of the present invention is convenient for loading and unloading and maintenance, has high interchangeability with ordinary butterfly valves, has a simple structure, a reasonable design, and is economical and practical.

[0004] The above-mentioned prior art solutions have the following defects: when the valve is switched at high frequency or subjected to a large medium pressure, the soft sealing gasket between the valve plate and the valve body will be subjected to a large extrusion force and shear force. If the design or material selection of the soft sealing gasket is improper, these forces may be indirectly transmitted through the valve plate to the components directly or indirectly connected to the valve plate, including the fixing screws. In particular, when there are design defects or wear at the connection between the valve plate and the valve stem, the transmission of this force may be more significant. Due to the existence of the above-mentioned force transmission path, the fixing screws may be subjected to additional alternating stresses. Under high-frequency switching or long-term operation, these alternating stresses may cause the screws to loosen. In addition, if the material, preload force or installation process of the fixing screws is improper, the risk of loosening will also increase. Once the fixing screws loosen and fall off, it will not only affect the sealing performance of the valve, but also the fallen screws may fall into the pipeline, causing blockage, wear and even more serious safety accidents to the pipeline system. In particular, this effect is more significant in high-pressure and high-speed flowing media. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a double-sealed butterfly valve that prevents the pressure ring and screws from loosening, which has the effect of tightening the sealing gasket and preventing the pressure ring and screws from loosening and falling off due to the impact of the medium.

[0006] The above utility model object of the utility model is achieved through the following technical solutions:

[0007] A double-sealed butterfly valve for preventing a pressure ring screw from loosening comprises a valve body and a valve stem, wherein the valve stem is rotatably arranged in the valve body, a butterfly plate is detachably fixedly connected to the valve stem, and the butterfly plate is arranged in the valve body and matched with the inner wall thereof;

[0008] As a further technical solution of the utility model: sealing rings are detachably fixed to the edges of both sides of the butterfly plate, and a pressure ring detachably fixedly connected to the butterfly plate is provided on the outer side of the sealing ring. The pressure ring is used to fix the sealing ring to the butterfly plate, and a plurality of fasteners and a plurality of supporting members are detachably fixed to the circumference of the pressure ring. The fasteners are used to detachably fix the pressure ring to the butterfly plate, and the supporting member is detachably fixed to the pressure ring and one end of the supporting member abuts against the outer side of the butterfly plate.

[0009] As a further technical solution of the utility model: 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.

[0010] As a further technical solution of the utility model: the support member is a bolt, the bolt is threadedly connected to the pressure ring, and one end of the bolt passes through the pressure ring and abuts against the surface of the butterfly plate.

[0011] As a further technical solution of the utility model: a plurality of the fasteners and the support members are evenly spaced and distributed around the pressure ring.

[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 two side edges 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 utility model: 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] As a further technical solution of the utility model: a bottom cover is provided at the bottom of the valve body, and the bottom cover and the valve body are detachably fixedly connected.

[0015] In summary, the utility model includes at least one of the following beneficial technical effects:

[0016] 1. The utility model relates to a double-sealed butterfly valve which prevents the screws of the pressing ring from loosening. A plurality of fasteners and a plurality of supporting members are detachably fixed on the peripheral side of the pressing ring, which effectively presses the sealing gasket in the annular groove, so that the butterfly plate rotates in the valve body through the valve stem to realize the opening and closing of the valve. The butterfly plate cooperates with the inner wall of the valve body to ensure the sealing of the valve when it is closed.

[0017] 2. The utility model relates to a double-sealed butterfly valve which prevents the screws of a pressure ring from loosening. The valve is threadedly connected to the pressure ring by bolts. One end of the bolt passes through the pressure ring and abuts against the surface of the butterfly plate. A plurality of fasteners and support members are evenly spaced and distributed around the pressure ring. When the screws and bolts are tightened, they interact with each other, which not only prevents the screws from loosening and falling off due to the impact of the medium, but also provides additional supporting force for the pressure ring, preventing the pressure ring from deforming or loosening due to the pressure or vibration of the medium, and preventing the screws from loosening, falling off, and falling into the pipeline, affecting the performance of the double-sealed butterfly plate and causing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the fastening device of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the support member of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the fastening device and the supporting members of the utility model that are evenly spaced and distributed.

[0022] Figure numerals: 1, bottom cover; 2, valve body; 3, sealing ring; 31, limit block; 32, protrusion; 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; 7, support; 71, bolt. DETAILED DESCRIPTION

[0023] 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; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0024] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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.

[0026] Embodiment 1:

[0027] like Figure 1 A double-sealed butterfly valve for preventing a pressing ring screw from loosening comprises a valve body 2 and a valve stem 6, wherein the valve stem 6 is rotatably arranged in the valve body 2, and a butterfly plate 4 is detachably fixedly connected to the valve stem 6, and the butterfly plate 4 is arranged in the valve body 2 and matched with the inner wall thereof, and sealing rings 3 are detachably fixedly arranged on the edges on both sides of the butterfly plate 4, and a pressing ring 5 detachably fixedly connected to the butterfly plate 4 is arranged on the outer side of the sealing ring 3, and the pressing ring 5 is used to fix the sealing ring 3 on the butterfly plate 4, and a plurality of fasteners 51 and a plurality of supporting members 7 are detachably fixed on the circumferential side of the pressing ring 5, and the fastener 51 is used to detachably fix the pressing ring 5 on the butterfly plate 4, and the supporting member 7 is detachably fixed on the pressing ring 5 and one end of the supporting member 7 abuts against the outer side of the butterfly plate 4. The pressure ring 5 is detachably fixed to the butterfly plate 4 by the fastener 51, and one end of the support member 7 is abutted against the outer side of the butterfly plate 4. The setting of the support member 7 provides additional supporting force and forms a pair of balancing forces with the tightening force of the fastener. This double fixing method greatly enhances the stability of the pressure ring 5, effectively prevents the loosening of the pressure ring and the screw, makes the whole structure more stable, and reduces loosening or damage caused by uneven force.

[0028] like Figure 3 The support member 7 is preferably a bolt 72, which is threadedly connected to the pressure ring 5, and one end of the bolt 72 passes through the pressure ring 5 and abuts against the surface of the butterfly plate 4. Figure 4, multiple fasteners 51 and support members 7 are evenly spaced and distributed around the pressing ring 5. When the screws 53 and bolts 71 are tightened, they interact with each other, which can not only prevent the screws 53 from loosening and falling off due to the impact of the medium, but also provide additional supporting force for the pressing ring 5, preventing the pressing ring 5 from being deformed or loosened due to the pressure or vibration of the medium, and preventing the screws 53 from being easily loosened, falling off, and falling into the pipeline, affecting the performance of the double-sealing butterfly plate 4, and causing safety accidents.

[0029] like Figure 2 The fastener 51 is preferably a screw 53, one end of the screw 53 passes through the pressing ring 5 and is threadedly connected to the butterfly plate 4. The peripheral edge of the pressing ring 5 is provided with a plurality of mounting holes 52 matching the screws, and 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 on the butterfly plate 4 to ensure that the sealing ring 3 can maintain stable sealing performance under extreme working conditions and prevent it from loosening under high pressure or vibration environment.

[0030] A first groove 41 is provided on the edge of the pressure ring 5 close to the sealing ring 3, and second grooves 42 opposite to the first groove 41 are 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.

[0031] The edge of the sealing ring 3 gradually shrinks toward the center to form a protrusion 32, and the protrusion 32 presses 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.

[0032] like Figure 1 , a bottom cover 1 is provided at the bottom of the valve body 2, and the bottom cover 1 and the valve body 2 are detachably fixedly connected. Good sealing needs to be ensured between the bottom cover 1 and the valve body 2 to prevent leakage of the medium. Therefore, a sealing gasket is usually provided at the connection or a sealing material such as a sealant is used to ensure the sealing effect of the connection. Fasteners such as bolts 71, nuts, screws 53 can be used to tightly connect the bottom cover 1 and the valve body 2 together through the screwing action of the thread. This connection method is simple and reliable, and is easy to disassemble and maintain.

[0033] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A double-sealed butterfly valve for preventing a compression ring screw from loosening, comprising a valve body (2) and a valve stem (6), wherein the valve stem (6) is rotatably arranged in the valve body (2), a butterfly plate (4) is detachably fixedly connected to the valve stem (6), and the butterfly plate (4) is arranged in the valve body (2) and matched with the inner wall thereof; The edges of both sides of the butterfly plate (4) are respectively detachably fixed with sealing rings (3), and the outer side of the sealing ring (3) is provided with a pressing ring (5) which is detachably fixedly connected to the butterfly plate (4), and the pressing ring (5) is used to fix the sealing ring (3) on the butterfly plate (4). It is characterized by: A plurality of fasteners (51) and a plurality of support members (7) are detachably fixed on the circumferential side of the pressure ring (5); the fasteners (51) are used to detachably fix the pressure ring (5) to the butterfly plate (4); the support member (7) is detachably fixed to the pressure ring (5) and one end of the support member (7) abuts against the outer side of the butterfly plate (4).

2. A double-sealed butterfly valve for preventing the screw of the pressing ring from loosening according to claim 1, 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).

3. A double-sealed butterfly valve for preventing the screw of the pressing ring from loosening according to claim 1, characterized in that: The support member (7) is a bolt (72), and the bolt (72) is threadedly connected to the pressure ring (5). One end of the bolt (72) passes through the pressure ring (5) and then abuts against the surface of the butterfly plate (4).

4. A double-sealed butterfly valve for preventing the screw of the pressing ring from loosening according to claim 3, characterized in that: The plurality of fasteners (51) and the support member (7) are evenly spaced and distributed around the pressure ring (5).

5. A double-sealed butterfly valve for preventing the screw of the pressing ring from loosening according to claim 4, characterized in that: A first groove (41) is formed on the edge of the pressure ring (5) close to the sealing ring (3), and second grooves (42) opposite to the first groove (41) are formed 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).

6. A double-sealed butterfly valve for preventing the screw of the pressing ring from loosening according to claim 5, characterized in that: The edge of the sealing ring (3) gradually shrinks towards the center to form a protrusion (32), and the protrusion (32) is tightly pressed against the inner wall of the valve body (2).

7. A double-sealed butterfly valve for preventing the screw of the pressing ring from loosening according to claim 6, characterized in that: A bottom cover (1) is provided at the bottom of the valve body (2), and the bottom cover (1) and the valve body (2) are detachably fixedly connected.

Images