Butterfly Valve

Abstract

To provide a butterfly valve which withstands internal pressure occurring in a duct, has resistance against a medium, and is easily assembled.SOLUTION: A butterfly valve 1 is used to cut off or adjust a medium flowing in a duct and includes: a housing 2 integrally formed and made of a plastic preferably; a disc 3; and a shaft 11. The disc 3 can pivot along the shaft 11 between an open position and a closed position. The disc 3 has: a core 4 made of a plastic; and a peripheral wall 5 made of a plastic. The plastic of the core 4 and the plastic of the peripheral wall 5 are not the same.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a butterfly valve for blocking or regulating a medium flowing through a pipeline, the butterfly valve having a housing formed in one piece, preferably made of plastic, a disk and a shaft, the disk being pivotable along the shaft between an open position and a closed position. [Background technology]

[0002] Butterfly valves are used in pipeline construction to close or regulate the flow of lines conveying liquid or gaseous media, which requires that the valve body be able to withstand the pressure in the pipeline.

[0003] In the butterfly valve disclosed in JP 63-87493 A, the valve body has an internal metal disc to achieve high strength and is coated with a corrosion resistant layer to protect the valve body from corrosion.

[0004] Japanese Patent Application Laid-Open No. 3-123908 also discloses a valve body having a metal core surrounded by a plastic layer.

[0005] In the above-mentioned prior art, an outer layer is applied to the valve body made of metal to protect against corrosion, which has the disadvantages that not only does the butterfly valve become heavy, but also that when the plastic layer peels off, corrosion occurs and the butterfly valve can no longer withstand the demands. Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the invention is to provide a butterfly valve and a method for producing the same which can withstand the internal pressure occurring in a pipeline, are resistant to media, and are easy to assemble. [Means for solving the problem]

[0007] This problem is solved according to the invention in that the disk has a core made of plastic and a circumferential wall made of plastic, the plastic of the core and the plastic of the wall being not the same, and in the method for producing a butterfly valve according to the invention, the shaft is inserted into the disk as a plug shaft.

[0008] The butterfly valve according to the invention has a housing, which is formed in one piece. This has the advantage that no additional assembly steps are required and no additional sealing elements have to be integrated. Preferably, the housing is manufactured from plastic. The butterfly valve according to the invention has a disk, which serves to open and close the butterfly valve and thus regulate the flow rate of the medium in the pipeline. For opening and closing, the disk can be pivoted about an axis, which preferably extends horizontally or vertically. The butterfly valve preferably has a central or eccentric design, i.e. in the central design, the pivot point of the disk can be in the center of the disk along the pipeline axis when the butterfly valve is closed, and in the eccentric design, the pivot point of the disk can be offset from the center of the disk along the pipeline axis when the butterfly valve is closed. The disk has a core and a circumferential wall, which are each manufactured from different plastics. In order to meet the requirements for high strength and resistance to media, the core consists of a tough and high-strength plastic, the plastic of the periphery having good resistance to media. The disk is manufactured by a multi-component injection molding process. Of course, the disk can also be manufactured by an insert molding process, i.e. the core is injection molded separately and then surrounded by the plastic of the periphery by injection in a separate mold. The plastic of the core has a higher strength than the plastic of the periphery, which is injection molded around the core. The core and the periphery contain different plastics. Preferably, the core contains a reinforced plastic, and the periphery consists of a partially crystalline or amorphous plastic, which is preferably not reinforced.

[0009] It is advantageous if the jacket completely surrounds the outer surface of the core or the surface of the core that contacts the medium. This ensures good protection of the core from the medium. The plastic of the jacket preferably fills the recesses or cavities between the webs in the rib structure of the core. The jacket and the core have a mesh structure, since the core has a rib structure and the plastic of the jacket is arranged in the recesses and on the outer surface of the core, surrounding the ribs. This ensures that the jacket cannot be dislodged from the core. The jacket and the core are preferably connected to each other in a form-locking manner. There is preferably no material connection between the jacket and the core.

[0010] The disk has a through hole which serves to receive the plug-in shaft.

[0011] As already mentioned above, the disk is preferably formed as a multi-component injection-molded part, particularly preferably as a two-component injection-molded part, using one plastic for the core and another plastic for the periphery, in order to meet the corresponding requirements.

[0012] In order to ensure that the core is made tough and strong, it is preferably made from a reinforced plastic, preferably a fiber-reinforced or sphere-reinforced plastic, particularly preferably a plastic reinforced with glass fibers or carbon fibers.

[0013] Preferably, the peripheral wall is made from a medium-resistant plastic, preferably a non-reinforced partially crystalline or amorphous plastic.

[0014] According to a preferred embodiment, the core has a rib structure, with recesses opening between the webs from one core top surface to the other. This rib structure entails the advantage that the plastic of the wall is arranged in the recesses and surrounding the ribs. This results in a crossing of both plastics and an optimal fixation of the wall to the core. The plastic is also arranged surrounding the top surface of the core and thus forms a closed wall surrounding the core, preferably with a crossing located inside the wall plastic and the core. This ensures that the wall cannot be detached from the core. The core and the wall preferably have a form connection. It is advantageous if both plastics do not have a material connection.

[0015] Preferably, the shaft is designed as a plug shaft, which is designed as a separate part and passes through the disk or a hole in the disk, the plug shaft being supported in the housing. This design with the plug shaft protruding through the completed disk entails the advantages of simple assembly and of being able to easily replace the disk in the event of a defect. The plug shaft is preferably manufactured from a metallic material, preferably steel.

[0016] It has been found to be a preferred embodiment that the plug-in shaft is connected to the disk in a form-locking manner, which makes it possible to introduce a pivoting movement of the disk via the plug-in shaft, which then causes the disk to rotate accordingly. For this purpose, the plug-in shaft preferably has at least one straight surface which corresponds to a straight surface in the hole of the disk. This ensures that the disk rotates with it simply by inserting the plug-in shaft.

[0017] The method according to the invention for manufacturing a butterfly valve comprises the steps of: manufacturing a one-piece housing, preferably by injection molding; Producing a disk produced by a two-component injection molding process; a step of assembling the disk in the housing, inserting a plug-in shaft through the housing and the disk, supporting an end of the plug-in shaft in the housing, and forming a rotation axis of the disk by the plug-in shaft; It has.

[0018] An embodiment of the present invention will be described with reference to the drawings, however, the present invention is not limited to this embodiment. [Brief description of the drawings]

[0019] [Figure 1] 1 is a vertical cross-sectional view of a butterfly valve according to the present invention. [Diagram 2] FIG. 2 is a three-dimensional partial cutaway view of a disk. [Diagram 3] FIG. [Figure 4] FIG. 2 is an exploded view of the butterfly valve according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] FIG. 1 shows a longitudinal section of a butterfly valve 1 according to the invention. The butterfly valve 1 serves to block and regulate the flow of a medium through a line. The butterfly valve 1 has a housing 2, which is made in one piece. This has the advantage that no additional sealing elements are required, and the assembly of the butterfly valve 1 is simple and economical. The housing 2 is preferably made of plastic. Other materials are also possible, for example metal or composite materials. For optimal sealing of the butterfly valve 1, a sealing element 16 is arranged on the inside of the housing 2. For blocking or regulating the flow of the medium, the butterfly valve 1 has a disk 3, which can be pivoted along an axis 11. In the illustrated embodiment, a central butterfly valve 1 is shown. It should be noted that an eccentric design is also possible, in which the axis does not run through the center of the disk in relation to the thickness of the disk, but is offset with respect to the center of the disk. The disk 3 has a core 4 and a peripheral wall 5. The peripheral wall 5 and the core 4 are not made of the same plastic. The core 4 comprises a plastic having a strength equal to or greater than that of the plastic of the peripheral wall 5. Preferably, this is achieved in that the plastic of the core 4 comprises reinforcing bodies, for example spheres or fibres or other reinforcing elements known in the art.

[0021] FIG. 2 shows the disk 3 of the butterfly valve 1 according to the invention in a partially cutaway view. The rib structure 8 of the core 4 can be clearly seen in the cut-out half of the peripheral wall 5. Between the webs 10, notches 9 extend. These notches 9 extend all the way from one upper surface 7 of the core 4 to the other upper surface 7 of the core 4. This entails the advantage that the plastic of the peripheral wall 5 is placed in or fills the notches 9 and thus connects the one outer layer 12 of the peripheral wall 5 with the other outer layer 12 of the peripheral wall 5 to one another through the core 4. This cross structure of the disk 3 made of at least two plastics and formed as a multi-component injection-molded part forms a positive connection and prevents the peripheral wall 5 from being disengaged from the core 4. It can also be clearly seen that the peripheral wall 5 completely surrounds the outer surface 6 of the core 4. This ensures that the core 4 does not come into contact with the medium, which comes into contact exclusively with the peripheral wall 5 of the disk 3. The outer layer 12 of the peripheral wall 5 forms a flat surface so that it has no additional resistance in the open position and no undercuts or edges where bacteria or other impurities may accumulate.

[0022] FIG. 3 shows a plan view of the disk 3 of the butterfly valve 1 according to the invention. The disk 3 is also shown in FIG. 3 in a partially cutaway view, with the peripheral wall 5 removed in one half in order to show the core 4 of the disk 3. The disk 3 in the illustrated embodiment has a lens shape. However, other shapes of the disk are also possible, as well as an eccentric arrangement of the shaft. A hole 14 serves to receive a shaft 11 or plug shaft which is inserted through the disk 3 in order to arrange the disk 3 in the housing 2. A form-locking feature 13 in the hole 14, which allows the disk 3 to pivot via the shaft 11, can be clearly seen. This form-locking feature 13 can be formed via at least one straight surface, as shown in FIG. 3, or via a square or polygonal shape, or via other form-locking connection possibilities which can preferably be realized by simple plugging in of a plug shaft.

[0023] In Fig. 4, the butterfly valve 1 according to the invention is shown in an exploded view. It can be clearly seen in Fig. 4 that the disk 3 is mounted in the housing 2 by a simple plugging of a shaft or plug-in shaft 11. A form-fitting 15 on the shaft 11 corresponds to a form-fitting 13 in the hole 14 of the disk 3. Although in Fig. 4 a surface is shown to achieve the form-fitting 13 / 15 between the disk 3 and the shaft 11, as already mentioned this can also be achieved by another form-fitting.

[0024] The butterfly valve 1 according to the invention is manufactured by producing the integral housing 2, preferably from a plastic, by an injection molding process, producing the disc 3 by a two-component injection molding process, and assembling the butterfly valve 1 by simply inserting the plug-in shaft 11 through the disc 3, the disc 3 being located in the housing 2 during the insertion and the plug-in shaft 11 being supported in the housing. [Explanation of symbols]

[0025] 1. Butterfly valve 2. Housing 3 Disc 4 cores 5 Peripheral wall 6 Core Outer Surface 7 Top of the core 8 Rib structure 9 Notch 10. Web 11 axes / insertion axes 12 Outer layer of the perimeter wall 13 Hole shape connection 14 holes 15 Shaft shape connection part 16 Sealing material

Claims

1. A butterfly valve (1) for blocking or regulating a medium flowing through a pipeline, the butterfly valve (1) having an integrally formed housing (2), a disk (3) and a shaft (11), the disk (3) being pivotable along the shaft (11) between an open position and a closed position, the disk (3) has a core (4) made of plastic and a peripheral wall (5) made of plastic, the plastic of the core (4) and the plastic of the peripheral wall (5) being not the same, the core (4) has a rib structure (8) between a number of webs (10) in which are provided parallel recesses, each of which is penetrated by a notch (9), the positions of the notches (9) in adjacent recesses being at least partially offset relative to one another in the longitudinal and transverse directions, the shaft (11) being formed as a plug shaft and as a separate element, projecting completely through the disk, the disk (3) and the core (4) having a lens shape, Butterfly valve (1).

2. 2. The butterfly valve (1) according to claim 1, characterized in that the peripheral wall (5) completely surrounds the outer surface (6) of the core (4) or the surface of the core (4) that contacts the medium, whereby the core (4) does not come into contact with the medium.

3. 3. The butterfly valve (1) according to claim 1 or 2, characterized in that the disk (3) is formed as a multi-component injection molded part.

4. 4. The butterfly valve (1) according to any one of claims 1 to 3, characterized in that the core (4) is made from reinforced plastic.

5. 5. The butterfly valve (1) according to claim 4, characterized in that the core (4) is made from fiber-reinforced or sphere-reinforced plastic.

6. 6. A butterfly valve (1) according to claim 4 or 5, characterized in that the core (4) is made from plastic reinforced with glass fibre or carbon fibre.

7. 4. The butterfly valve (1) according to claim 1, wherein the peripheral wall (5) is made from a medium-resistant plastic.

8. 8. The butterfly valve (1) according to claim 7, characterized in that the peripheral wall (5) is made from an unreinforced partially crystalline or amorphous plastic.

9. 2. The butterfly valve (1) according to claim 1, characterized in that the plug shaft (11) is supported in the housing.

10. 9. The butterfly valve (1) according to claim 7 or 8, characterized in that the plug-in shaft (11) is connected to the disk (3) in a form-locking manner.

11. A method for manufacturing a butterfly valve (1) according to any one of claims 1 to 9, comprising the steps of: Manufacturing an integral housing (2), - manufacturing a disk (3) produced by a two-component injection molding or insert molding process; a step of assembling the disk (3) in the housing (2), inserting a shaft (11) through the housing (2) and the disk (3), supporting an end of the shaft (11) in the housing (2), and forming a rotation axis of the disk (3) by the shaft (11); The method comprising:

12. 12. Method according to claim 11, characterized in that the integral housing (2) is manufactured by an injection molding process.

13. 13. The method according to claim 11 or 12, characterized in that the shaft (11) is designed as a plug shaft (11).

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