A double-seal water inlet butterfly valve based on metal casting

Abstract

The utility model discloses a kind of double-seal water inlet butterfly valves based on metal casting, it is related to double-seal butterfly valve field, including valve body, the top of valve body is fixedly connected with protective box, the inner wall of protective box is provided with anti-misoperation mechanism, the right side of valve body is provided with sealing mechanism, sealing mechanism is used for sealing;Anti-misoperation mechanism includes handle, the outer wall of handle is rotatably connected with the inner wall of protective box, the outer wall of handle is fixedly connected with gear one, the outer wall of gear one is engagedly connected with gear two, the inner wall of gear two is provided with rotating assembly.In the utility model, handle drives gear one to rotate, since the number of teeth of gear one is less than gear two, so it can amplify torque, easily drive gear two and rotating assembly to rotate to target position, insert U-shaped plate, cause wedge-shaped block to compress the clamping block on both sides, when wedge-shaped block falls below clamping block, wedge-shaped block and clamping block realize clamping, to prevent the occurrence of misoperation condition in this way.

Description

Technical Field

[0001] This utility model relates to the field of double-seal butterfly valves, specifically a double-seal inlet butterfly valve based on metal casting. Background Technology

[0002] In the fields of hydropower, urban water supply and drainage, and petrochemicals, inlet butterfly valves are core control devices in fluid transport systems. Their sealing reliability directly determines the safe operation efficiency of the entire pipeline network. Traditional single-seal butterfly valves rely on only one sealing structure to cut off the medium. Under high pressure, impurities, or frequent opening and closing conditions, they are prone to seal wear and leakage. Moreover, maintenance requires emptying the entire pipeline network, resulting in high operation and maintenance costs and long cycles. Double-seal inlet butterfly valves were developed to solve this problem. By setting two or more sealing defenses in the same sealing area or different locations, they form a sealing logic of layered interception and collaborative protection, which not only greatly improves sealing reliability, but also enables online maintenance under pressure through division of labor design. It has become the mainstream choice for medium and low pressure head scenarios. As industrial equipment develops towards larger size and higher parameters, traditional welded multi-seal butterfly valves are no longer suitable for large-diameter and high-head conditions due to their defects of stress concentration and weak deformation resistance. Against this backdrop, the double-seal inlet butterfly valve based on metal casting has emerged. It adopts an integral metal casting process to form the core pressure-bearing components, takes multiple seals as the core design concept, and is equipped with mechanical anti-accidental contact and structural reinforcement technologies, becoming the current technological development direction of the industry.

[0003] Double-seal inlet butterfly valves refer to valve bodies and butterfly plates whose core pressure-bearing components are formed by integral metal casting. They are designed with multiple seals as their core concept, achieving layered protection by setting two or more sealing structures in the same sealing area or different locations. They are equipped with inlet control devices featuring mechanical anti-accidental contact and structural reinforcement units. Traditional multi-seal products have multiple sealing structures that increase the rotational resistance of the butterfly plate, and impurities easily accumulate in the sealing grooves, leading to seal jamming, accelerated wear, and shortened seal life. To address these drawbacks, existing technologies arrange the sealing structure in layers according to functions such as dustproofing, wear resistance, elastic sealing, and rigid support, with each layer working synergistically to improve sealing reliability. However, existing technologies cannot achieve anti-accidental contact functionality, leading to problems such as water hammer and media leakage caused by accidental opening and closing of the butterfly valve, resulting in low safety. Utility Model Content

[0004] This utility model provides a double-seal inlet butterfly valve based on metal casting, which solves the problem that the existing technology cannot achieve the function of preventing accidental contact, resulting in water impact and medium leakage caused by accidental opening and closing of the butterfly valve, and the problem of low safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A double-seal inlet butterfly valve based on metal casting includes a valve body, a protective box fixedly connected to the top of the valve body, an anti-accidental contact mechanism provided on the inner wall of the protective box, and a sealing mechanism provided on the right side of the valve body for sealing; the anti-accidental contact mechanism includes a handle, the outer wall of the handle is rotatably connected to the inner wall of the protective box, a gear one is fixedly connected to the outer wall of the handle, a gear two is meshed with the outer wall of gear one, a rotating component is provided on the inner wall of gear two, a locking component is provided on the outer wall of the handle, and an elastic component is provided on the right side of the protective box.

[0006] As a preferred technical solution of this utility model The sealing mechanism includes a limiting groove. A limiting groove is formed on the inner wall of the valve body. A labyrinth-type sealing groove is fixedly connected to the outer wall of the limiting groove. An anti-extrusion retaining ring is fixedly connected to the left side of the labyrinth-type sealing groove. Multiple sealing components are provided on the outer wall of the limiting groove. A protective component is provided on the outer wall of the limiting groove.

[0007] As a preferred technical solution of this utility model The rotating assembly includes a rotating disc, the inner wall of which is fixedly connected to the inner wall of gear two, and multiple reinforcing ribs are fixedly connected to both the front and rear sides of the rotating disc.

[0008] As a preferred technical solution of this utility model The engaging assembly includes a U-shaped plate, the outer wall of which is slidably connected to the outer wall of the handle, and a wedge block is fixedly connected to the bottom of the U-shaped plate.

[0009] As a preferred technical solution of this utility model The elastic component includes a U-shaped seat, an elastic column is fixedly connected to the inner wall of the U-shaped seat, and a locking block is fixedly connected to the rear side of the elastic column.

[0010] As a preferred technical solution of this utility model The multi-sealing assembly includes an O-ring, the outer wall of which is slidably connected to the outer wall of the limiting groove, and a metal baffle is fixedly connected to the outer wall of the limiting groove.

[0011] As a preferred technical solution of this utility model The protective component includes a wear-resistant rubber ring, the outer wall of which is fixedly connected to the outer wall of the limiting groove, and a dustproof ring is fixedly connected to the front side of the wear-resistant rubber ring.

[0012] This utility model has the following advantages: the handle drives the first gear to rotate. Since the first gear has fewer teeth than the second gear, the second gear rotates at a slower speed, but it can amplify the torque, so it can easily drive the second gear and the rotating assembly to the target position. Then, the U-shaped plate is inserted, causing the wedge block to compress the locking blocks on both sides, and the elastic column is also compressed. When the wedge block falls below the locking block, the wedge block and the locking block engage, thereby preventing accidental contact and avoiding water impact and media leakage caused by accidental opening or closing of the butterfly valve, thus enhancing safety. The O-ring, with its own elasticity, fits tightly against the outer wall of the rotating disc, filling tiny gaps to achieve a basic seal. A metal baffle covers its left side, enhancing the rigidity of the seal and preventing it from being scratched by sharp impurities in the medium. The anti-extrusion retaining ring prevents high-pressure medium from squeezing the seal out of the limiting groove, structurally eliminating the possibility of seal failure. If a tiny amount of medium leaks through the multiple sealing components, it will enter the labyrinth-shaped sealing groove. As it flows through the tortuous channel, the medium pressure is gradually consumed, and the residual medium in the groove forms a pressure buffer layer, preventing subsequent medium from continuing to penetrate, achieving a deep seal. The dust ring can intercept mud and impurities in the medium first, and the wear-resistant rubber ring can reduce friction loss and extend the service life of the seal. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the valve body structure of a double-seal inlet butterfly valve based on metal casting.

[0014] Figure 2 This is a schematic diagram of the handle in a double-seal inlet butterfly valve based on metal casting.

[0015] Figure 3 This is a schematic diagram of the locking assembly in a double-seal inlet butterfly valve based on metal casting.

[0016] Figure 4 This is a schematic diagram of the structure of an O-ring in a double-seal inlet butterfly valve based on metal casting.

[0017] In the diagram: 1. Valve body; 2. Anti-accidental contact mechanism; 201. Handle; 202. Gear 1; 203. Gear 2; 204. Rotating assembly; 2041. Rotating disc; 2042. Reinforcing rib; 205. Engaging assembly; 2051. U-shaped plate; 2052. Wedge block; 206. Elastic assembly; 2061. U-shaped seat; 2062. Elastic column; 2063. Engaging block; 3. Sealing mechanism; 301. Limiting groove; 302. Labyrinth-type sealing groove; 303. Anti-extrusion retaining ring; 304. Multiple sealing assembly; 3041. O-ring; 3042. Metal baffle; 305. Protective assembly; 3051. Wear-resistant rubber ring; 3052. Dustproof ring; 4. Protective box. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model. Example 1

[0020] Please see Figure 1-3 A double-seal inlet butterfly valve based on metal casting includes a valve body 1, a protective box 4 fixedly connected to the top of the valve body 1, an anti-accidental contact mechanism 2 provided on the inner wall of the protective box 4, the anti-accidental contact mechanism 2 is used to prevent the valve body 1 from being accidentally opened or closed due to the handle 201 being operated by mistake, and a sealing mechanism 3 is provided on the right side of the valve body 1, the sealing mechanism 3 is used for sealing; the anti-accidental contact mechanism 2 includes a handle 201, the outer wall of the handle 201 is rotatably connected to the inner wall of the protective box 4, a gear 1 202 is fixedly connected to the outer wall of the handle 201, the gear 1 202 is used to transmit the rotational torque of the handle 201, a gear 203 is meshed on the outer wall of the gear 1 202, a rotating component 204 is provided on the inner wall of the gear 203, the rotating component 204 is used to directly control the opening and closing of the medium inside the valve body 1, a locking component 205 is provided on the outer wall of the handle 201, and an elastic component 206 is provided on the right side of the protective box 4; Specifically, the device includes a valve body 1, which serves as the core load-bearing component of the entire device. The valve body 1 accommodates the flow of media and provides a mounting base for various auxiliary mechanisms. A protective box 4 is fixedly connected to its top, encapsulating and protecting the internal anti-accidental contact mechanism 2 to prevent external impurities from entering or accidental contact with the core component. A sealing mechanism 3 is located on the right side of the valve body 1, used to seal the internal media and prevent leakage. The anti-accidental contact mechanism 2 includes a handle 201, which serves as the operating end for the operator to control the opening and closing of the valve body 1. A gear 203 is meshed with the outer wall of gear one 202, and the gear two 203 cooperates with gear one 202 to achieve a speed reduction and torque increase effect. A locking component 205 is located on the outer wall of the handle 201, used to lock the position of the handle 201. An elastic component 206 is located on the right side of the protective box 4, which cooperates with the locking component 205 to achieve a locking function.

[0021] In one instance of this embodiment, please refer to Figure 3 and Figure 4 The sealing mechanism 3 includes a limiting groove 301. The inner wall of the valve body 1 is provided with a limiting groove 301. A labyrinth-type sealing groove 302 is fixedly connected to the outer wall of the limiting groove 301. An anti-extrusion retaining ring 303 is fixedly connected to the left side of the labyrinth-type sealing groove 302. The anti-extrusion retaining ring 303 is used to prevent the sealing element from being squeezed out of the limiting groove 301 under the action of high pressure medium. Multiple sealing components 304 are provided on the outer wall of the limiting groove 301. A protective component 305 is provided on the outer wall of the limiting groove 301. The protective component 305 is used to protect the sealing element from wear by impurities and extend its service life. The rotating component 204 includes a rotating butterfly plate 2041. The inner wall of the rotating butterfly plate 2041 is fixedly connected to the inner wall of the gear 203. Multiple reinforcing ribs 2042 are fixedly connected to the front and rear sides of the rotating butterfly plate 2041. The reinforcing ribs 2042 are used to enhance the structural strength of the rotating butterfly plate 2041 and prevent it from deforming under the impact of high pressure medium. Specifically, the sealing mechanism 3 includes a limiting groove 301, which provides installation and positioning space for the sealing components to ensure the assembly accuracy of the sealing structure. The inner wall of the valve body 1 has a limiting groove 301, and the outer wall of the limiting groove 301 is fixedly connected to a labyrinth-type sealing groove 302. The labyrinth-type sealing groove 302 consumes the pressure of the leaking medium through a tortuous channel to achieve deep sealing. The outer wall of the limiting groove 301 is provided with a multi-seal assembly 304, which achieves basic sealing function and prevents direct leakage of the medium. The rotating assembly 204 includes a rotating butterfly plate 2041, which is the core component for opening and closing the valve body 1. The rotating butterfly plate 2041 realizes the flow or blockage of the medium through rotation. The inner wall of the rotating butterfly plate 2041 is fixedly connected to the inner wall of the gear 203 to ensure stable power transmission.

[0022] In one instance of this embodiment, please refer to Figure 2 and Figure 3 The engaging component 205 includes a U-shaped plate 2051, the outer wall of which is slidably connected to the outer wall of the handle 201. A wedge block 2052 is fixedly connected to the bottom of the U-shaped plate 2051. The wedge block 2052 uses a wedge structure to facilitate the compression of the elastic component 206 and achieve stable engagement. The elastic component 206 includes a U-shaped seat 2061, the inner wall of which is fixedly connected to an elastic post 2062. The elastic post 2062 has an elastic reset function and can drive the engaging block 2063 to reset and engage. The engaging block 2063 is fixedly connected to the rear side of the elastic post 2062. Specifically, the engaging component 205 includes a U-shaped plate 2051, which serves as the actuating component for the engaging operation. The outer wall of the U-shaped plate 2051 is slidably connected to the outer wall of the handle 201, ensuring that the U-shaped plate 2051 can move up and down along the handle 201. The elastic component 206 includes a U-shaped seat 2061, which provides mounting support for the elastic column 2062. The rear side of the elastic column 2062 is fixedly connected to an engaging block 2063, which cooperates with the wedge block 2052 to lock the position of the handle 201.

[0023] In one instance of this embodiment, please refer to Figure 2 and Figure 3 The multi-seal assembly 304 includes an O-ring rubber ring 3041, the outer wall of which is slidably connected to the outer wall of the limiting groove 301. A metal baffle 3042 is fixedly connected to the outer wall of the limiting groove 301. The metal baffle 3042 is used to enhance the rigidity of the sealing structure and protect the O-ring rubber ring 3041. The protective assembly 305 includes a wear-resistant rubber ring 3051, the outer wall of which is fixedly connected to the outer wall of the limiting groove 301. A dustproof ring 3052 is fixedly connected to the front side of the wear-resistant rubber ring 3051. The dustproof ring 3052 is used to intercept mud and impurities in the medium and prevent impurities from entering the sealing surface. Specifically, the multi-seal assembly 304 includes an O-ring 3041, which achieves basic sealing through its own elasticity. The outer wall of the O-ring 3041 is slidably connected to the outer wall of the limiting groove 301 for easy assembly and replacement. The protective assembly 305 includes a wear-resistant rubber ring 3051, which is used to reduce frictional wear between the rotating disc 2041 and the sealing structure. The outer wall of the wear-resistant rubber ring 3051 is fixedly connected to the outer wall of the limiting groove 301 to ensure secure installation.

[0024] In the implementation of this utility model, the handle 201 drives the gear 1 202 to rotate. The number of teeth of the gear 1 202 is less than that of the gear 2 203, so the gear 2 203 rotates slowly, but it can amplify the torque and easily drive the gear 2 203 and the rotating component 204 to rotate to the target position. Then, the U-shaped plate 2051 is inserted, so that the wedge block 2052 compresses the locking blocks 2063 on both sides. The elastic column 2062 is compressed. When the wedge block 2052 falls below the locking block 2063, it locks the wedge block 2052 and the locking block 2063 to prevent accidental contact and avoid water impact and media leakage caused by accidental opening and closing of the butterfly valve, thus enhancing safety. The O-ring 3041 elastically adheres to the outer wall of the rotating disc 2041, filling tiny gaps to achieve a basic seal. The metal baffle 3042 covers the left side of the metal baffle 3042, enhancing the rigidity of the seal and preventing it from being scratched by sharp impurities in the medium. The anti-extrusion retaining ring 303 prevents the high-pressure medium from squeezing the seal out of the limiting groove 301, structurally eliminating seal failure. If a very small amount of medium leaks through the multiple sealing components 304, it will enter the labyrinth-type sealing groove 302. As it flows around through the tortuous channel, the medium pressure is gradually consumed, and the residual medium in the groove forms a pressure buffer layer, preventing subsequent medium from continuing to penetrate, achieving a deep seal. The dust ring 3052 first intercepts mud and impurities in the medium, and the wear-resistant rubber ring 3051 reduces friction loss and extends the service life of the seal.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A double-seal inlet butterfly valve based on metal casting, comprising a valve body (1), characterized in that, A protective box (4) is fixedly connected to the top of the valve body (1). An anti-accidental contact mechanism (2) is provided on the inner wall of the protective box (4). A sealing mechanism (3) is provided on the right side of the valve body (1). The sealing mechanism (3) is used for sealing. The anti-accidental contact mechanism (2) includes a handle (201). The outer wall of the handle (201) is rotatably connected to the inner wall of the protective box (4). A gear one (202) is fixedly connected to the outer wall of the handle (201). A gear two (203) is meshed with the outer wall of the gear one (202). A rotating component (204) is provided on the inner wall of the gear two (203). A locking component (205) is provided on the outer wall of the handle (201). An elastic component (206) is provided on the right side of the protective box (4).

2. The double-seal inlet butterfly valve based on metal casting according to claim 1, characterized in that, The sealing mechanism (3) includes a limiting groove (301). The inner wall of the valve body (1) is provided with a limiting groove (301). A labyrinth-type sealing groove (302) is fixedly connected to the outer wall of the limiting groove (301). An anti-extrusion retaining ring (303) is fixedly connected to the left side of the labyrinth-type sealing groove (302). A multi-seal assembly (304) is provided on the outer wall of the limiting groove (301). A protective assembly (305) is provided on the outer wall of the limiting groove (301).

3. The double-seal inlet butterfly valve based on metal casting according to claim 1, characterized in that, The rotating assembly (204) includes a rotating butterfly plate (2041), the inner wall of which is fixedly connected to the inner wall of the gear two (203), and multiple reinforcing ribs (2042) are fixedly connected to the front and rear sides of the rotating butterfly plate (2041).

4. The double-seal inlet butterfly valve based on metal casting according to claim 1, characterized in that, The engaging assembly (205) includes a U-shaped plate (2051), the outer wall of which is slidably connected to the outer wall of the handle (201), and a wedge block (2052) is fixedly connected to the bottom of the U-shaped plate (2051).

5. A double-seal inlet butterfly valve based on metal casting according to claim 1, characterized in that, The elastic component (206) includes a U-shaped seat (2061), an elastic column (2062) is fixedly connected to the inner wall of the U-shaped seat (2061), and a locking block (2063) is fixedly connected to the rear side of the elastic column (2062).

6. A double-seal inlet butterfly valve based on metal casting according to claim 2, characterized in that, The multi-sealing assembly (304) includes an O-ring (3041), the outer wall of which is slidably connected to the outer wall of the limiting groove (301), and a metal baffle (3042) is fixedly connected to the outer wall of the limiting groove (301).

7. A double-seal inlet butterfly valve based on metal casting according to claim 2, characterized in that, The protective component (305) includes a wear-resistant rubber ring (3051), the outer wall of the wear-resistant rubber ring (3051) is fixedly connected to the outer wall of the limiting groove (301), and a dustproof ring (3052) is fixedly connected to the front side of the wear-resistant rubber ring (3051).

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