Center line-type butterfly valve

Abstract

A center line-type butterfly valve comprises a valve body (1), a valve rod (2) and a butterfly plate (3), connecting flanges (5) are arranged on the two sides of the valve body (1), an elastic sealing layer (6) is arranged in a cavity of the valve body (1), and the elastic sealing layer (6) extends outwards to the connecting sides of the connecting flanges (5). When the butterfly plate is connected with a pipeline, the two ends of the elastic rubber layer can be fixed, deformation of the elastic rubber layer is effectively prevented, meanwhile, supporting springs are arranged at the upper end and the lower end of the elastic rubber layer at the connecting position of the butterfly plate and the valve rod, and when the butterfly plate extrudes the elastic rubber layer in a sealed mode, the upper end and the lower end of the elastic rubber layer at the connecting position of the butterfly plate and the valve rod have certain elastic telescopic spaces. The sealing effect is improved.

Description

Technical Field

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

[0002] The centerline butterfly valve is a component used to achieve on-off and flow control of the pipeline system. Most of the existing seals are wrapped with an elastic rubber layer in the inner cavity of the valve body, and a metal sealing ring is welded to the outer ring of the butterfly plate. The sealing is achieved through the combination of flexibility and rigidity. However, both ends of the elastic rubber layer are located in the cavity of the valve body. When connected to the pipeline, the elastic rubber layer is easily deformed due to pressure, thereby affecting the sealing effect. At the same time, the structure of the connection between the elastic rubber layer and the valve stem is simple, and the sealing effect is poor, which also puts higher requirements on the sealing of the valve stem. Utility Model Content

[0003] The purpose of the utility model is to provide a center line butterfly valve in view of the above-mentioned shortcomings.

[0004] The utility model comprises a valve body, a valve stem and a butterfly plate. Both sides of the valve body are provided with connecting flanges. An elastic sealing layer is provided in the cavity of the valve body. The elastic sealing layer extends outward to the connecting side of the connecting flange.

[0005] The butterfly plate is installed in the cavity of the valve body through the valve stem and is sealed with the elastic sealing layer. The upper and lower ends of the valve body are provided with valve stem mounting seats, and a valve cover is provided on the valve stem mounting seats.

[0006] A sealing assembly is arranged in the valve stem mounting seat at the upper part, and a hand wheel for driving the valve stem to rotate is arranged on the valve cover at the upper part.

[0007] A group of annular protrusions are arranged on the connecting side of the connecting flange, and a group of annular positioning grooves matched with the annular protrusions are arranged on the elastic sealing layer.

[0008] The opening diameters at both sides of the elastic sealing layer are larger than the middle diameter thereof.

[0009] The upper and lower valve stem mounting seats are integrally cast with the valve body, and a tension spring that abuts against the elastic sealing layer is arranged in the upper and lower valve stem mounting seats;

[0010] A valve stem shaft bushing is provided in the upper valve stem mounting seat and on the lower valve cover.

[0011] Both upper and lower ends of the elastic sealing layer are provided with valve stem mounting holes, and spring positioning bosses are provided on the valve stem mounting holes.

[0012] The sealing assembly includes a first sealing ring and a second sealing ring which are distributed up and down. The connecting surfaces of the first sealing ring and the second sealing ring are both matching inclined surfaces. A circle of annular positioning blocks is arranged on the inner side wall of the first sealing ring, and a circle of annular positioning grooves matching the annular positioning blocks are arranged on the valve stem.

[0013] A spring compression ring is arranged between the tension spring located at the upper part and the second sealing ring.

[0014] The utility model has the advantages that both sides of the elastic rubber layer extend to the connecting side of the connecting flange, and the two ends of the elastic rubber layer can be fixed when connected with the pipeline, effectively preventing the elastic rubber layer from being deformed, and at the same time, tightening springs are provided at the upper and lower ends of the elastic rubber layer at the connection with the valve stem. When the butterfly plate squeezes the elastic rubber layer in a closed manner, the upper and lower ends of the elastic rubber layer at the connection with the valve stem have a certain elastic expansion and contraction space, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0017] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0018] Figure 4 It is a schematic diagram of water flow changes in the elastic sealing layer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", etc. appear in the description of the present utility model, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" 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 the present utility model can be understood according to specific circumstances.

[0023] As shown in the accompanying drawings, the utility model comprises a valve body 1, a valve stem 2 and a butterfly plate 3. Both sides of the valve body 1 are provided with connecting flanges 5. An elastic sealing layer 6 is provided in the cavity of the valve body 1.

[0024] The elastic sealing layer 6 extends outward to the connecting side of the connecting flange 5. When connected to the pipeline, the elastic sealing layer 6 is clamped when the pipeline end and the connecting flange 5 are connected, which effectively prevents the elastic sealing layer 6 from being deformed due to high pressure.

[0025] The butterfly plate 3 is installed in the cavity of the valve body 1 through the valve stem 2, and is sealed with the elastic sealing layer 6. The elastic sealing layer 6 is a corrosion-resistant rubber lining material, that is, a soft seal. A stainless steel sealing layer is provided on the circumference of the butterfly plate 3, that is, a hard seal. The sealing effect is improved by the cooperation of the hard seal and the soft seal.

[0026] Both upper and lower ends of the valve body 1 are provided with valve stem mounting seats 7, and a valve cover 8 is provided on the valve stem mounting seats 7.

[0027] A sealing assembly 9 is arranged in the valve stem mounting seat 7 at the upper part, and a hand wheel 10 for driving the valve stem 2 to rotate is arranged on the valve cover 8 at the upper part.

[0028] Furthermore, a group of annular protrusions 12 are provided on the connecting side of the connecting flange 5 , and a group of annular positioning grooves matching with the annular protrusions 12 are provided on the elastic sealing layer 6 .

[0029] The annular protrusion 12 cooperates with the annular positioning groove to increase the friction between the edge of the elastic sealing layer 6 and the connecting flange 5 to prevent the elastic sealing layer 6 from loosening.

[0030] Preferably, the diameters of the openings on both sides of the elastic sealing layer 6 are larger than its middle diameter.

[0031] The middle part of the elastic sealing layer 6 is a sealing part that cooperates with the butterfly plate 3. When water flows from one side opening to the middle part of the elastic sealing layer 6, due to the narrowing of the diameter of the elastic sealing layer 6, the water flow direction changes from horizontal flow to centering, the water pressure increases, and the water flow is sprayed to the other side of the elastic sealing layer 6. After passing through the middle part of the elastic sealing layer 6, it expands and flows in a horizontal direction. That is, when the water flow passes through the middle part of the elastic sealing layer 6, it can reduce the scouring of the sealing part and reduce the wear of the sealing part ( Figure 4 as shown).

[0032] Furthermore, the upper and lower valve stem mounting seats 7 are integrally cast with the valve body 1, and a tension spring 15 is disposed in the upper and lower valve stem mounting seats 7 to abut against the elastic sealing layer 6;

[0033] The elastic sealing layer 6 is provided with valve stem 2 avoidance holes at both upper and lower ends, and the corresponding valve stem mounting seat 7 is provided with a tensioning spring mounting groove. The tensioning spring 15 is used to tighten the elastic sealing layer 6 at the mounting position of the valve stem 2. When the butterfly plate 3 is sealed, it will exert an outward supporting force on the elastic sealing layer 6. At this time, the tensioning spring 15 will exert a reverse thrust on the elastic sealing layer 6, applying pressure to the elastic sealing layer 6 from both sides, so that the valve stem 2 can be in close contact with the elastic sealing layer 6, thereby improving the sealing effect.

[0034] A valve stem shaft bushing 16 is provided in the upper valve stem mounting seat 7 and on the lower valve cover 8. The valve stem shaft bushing 16 keeps the axis of the valve stem 2 unchanged and stable when the valve stem 2 rotates.

[0035] Furthermore, valve stem mounting holes are provided at both upper and lower ends of the elastic sealing layer 6, and spring positioning bosses 26 are provided on the valve stem mounting holes.

[0036] The spring positioning boss 26 is used to position the installation position of the tension spring 15 to prevent the tension spring 15 from deviating, so that the pressure applied by the tension spring 15 to the elastic sealing layer 6 is balanced.

[0037] Preferably, the sealing assembly 9 includes a first sealing ring 18 and a second sealing ring 19 which are arranged vertically, and the connecting surfaces of the first sealing ring 18 and the second sealing ring 19 are both matching inclined surfaces.

[0038] The two inclined surfaces cooperate to form opposite thrusts on the connecting surfaces of the first sealing ring 18 or the second sealing ring 19 when the first sealing ring 18 or the second sealing ring 19 is squeezed, so that the first sealing ring 18 and the second sealing ring 19 can fit the valve stem mounting seat 7 and the valve stem 2 more closely.

[0039] A circle of annular positioning blocks 20 are arranged on the inner side wall of the first sealing ring 18 , and a circle of annular positioning grooves matching with the annular positioning blocks 20 are arranged on the valve stem 2 .

[0040] The first sealing ring 18 is located at the top and is positioned by the annular positioning block 20 after installation to form a relatively fixed seal, while the second sealing ring 19 acts as a relatively movable seal. When squeezed by the tensioning spring 15, it transfers the pressure to the first sealing ring 18, so that the two cooperate to make the valve stem mounting seat 7 and the valve stem 2 fit more tightly.

[0041] Furthermore, a spring compression ring 25 is provided between the tension spring 15 at the upper part and the second sealing ring 19. The spring compression ring 25 enables the tension of the tension spring 15 to be transmitted to the second sealing ring 19 more evenly.

Claims

1. A midline butterfly valve, characterized in that The valve body (1) comprises a valve body (1), a valve stem (2) and a butterfly plate (3), wherein connecting flanges (5) are provided on both sides of the valve body (1), an elastic sealing layer (6) is provided in the cavity of the valve body (1), and the elastic sealing layer (6) extends outward to the connecting side of the connecting flange (5). The butterfly plate (3) is installed in the cavity of the valve body (1) through the valve stem (2) and cooperates with the elastic sealing layer (6) to be sealed. The valve body (1) is provided with valve stem mounting seats (7) at both upper and lower ends, and a valve cover (8) is provided on the valve stem mounting seat (7). A sealing assembly (9) is provided in the valve stem mounting seat (7) located at the upper part, and a hand wheel (10) for driving the valve stem (2) to rotate is provided on the valve cover (8) located at the upper part. The upper and lower valve stem mounting seats (7) are integrally cast with the valve body (1), and a tensioning spring (15) abutting against the elastic sealing layer (6) is provided in the upper and lower valve stem mounting seats (7); a valve stem shaft bushing (16) is provided in the upper valve stem mounting seat (7) and on the lower valve cover (8).

2. A centerline butterfly valve according to claim 1, characterized in that A group of annular protrusions (12) are provided on the connecting side of the connecting flange (5), and a group of annular positioning grooves matching the annular protrusions (12) are provided on the elastic sealing layer (6).

3. A centerline butterfly valve according to claim 1, characterized in that The diameters of the openings on both sides of the elastic sealing layer (6) are larger than the diameter in the middle.

4. A centerline butterfly valve according to claim 1, characterized in that The upper and lower ends of the elastic sealing layer (6) are both provided with valve stem mounting holes, and a spring positioning boss (26) is provided on the valve stem mounting hole.

5. A centerline butterfly valve according to claim 1, characterized in that The sealing assembly (9) comprises a first sealing ring (18) and a second sealing ring (19) which are arranged in an upper and lower manner, the connecting surfaces of the first sealing ring (18) and the second sealing ring (19) are both matching inclined surfaces, a circle of annular positioning blocks (20) are provided on the inner side wall of the first sealing ring (18), and a circle of annular positioning grooves matching the annular positioning blocks (20) are provided on the valve stem (2).

6. A centerline butterfly valve according to claim 5, characterized in that A spring clamping ring (25) is provided between the upper tensioning spring (15) and the second sealing ring (19).

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