Anti-fracture feeding structure for ball valve casting

Abstract

This application relates to the field of casting technology, and provides a fracture-resistant feeding structure for ball valve castings, including a riser body, which is a cylindrical cavity structure with an open top, and its bottom is connected to the valve body through a neck transition ring; the outer surface of the neck transition ring is provided with at least three radially extending anti-crack ribs; a heat insulation cover, which is detachably covered on the top of the riser body, has a fan-shaped pouring port on the heat insulation cover, and an inverted conical baffle column is provided on the bottom surface of the heat insulation cover, which is detachably connected to the heat insulation cover. This utility model optimizes the flow of molten metal by cooperating with the inverted conical baffle column and the fan-shaped pouring port, reducing turbulence and improving feeding efficiency; the triangular anti-crack ribs disperse neck stress, effectively reducing the risk of hot cracking; the magnetic heat insulation cover reduces heat loss and extends feeding time; the synergistic design of the spiral groove and the vent hole enables controllable flow of molten metal and reduces porosity defects.

Description

Technical Field

[0001] This application relates to the field of casting technology, and in particular to a fracture-preventing and feeding structure for ball valve castings. Background Technology

[0002] During the production of ball valve castings, feeding structures (such as risers) are typically used to reduce casting defects and ensure the density of the internal structure of the casting. The design of the anti-fracture feeding structure directly affects the quality and service life of the casting.

[0003] Currently, traditional ball valve casting feeding structures suffer from problems such as low feeding efficiency, susceptibility to hot cracking, and insufficient insulation performance, leading to a decrease in casting yield. Furthermore, the existing technology's simple connection between risers and insulation caps makes it difficult to effectively control the flow and solidification process of molten metal, further affecting the mechanical properties and reliability of the castings. Utility Model Content

[0004] This application provides a feeding structure for ball valve castings, which can improve the technical problems existing in related technologies, such as low feeding efficiency, easy generation of hot cracks, insufficient heat preservation performance, and poor control of molten metal flow and solidification process.

[0005] In a first aspect, embodiments of this application provide a feeding structure, comprising: a riser body, the riser body being a cylindrical cavity structure with an open top, the bottom of which is connected to the valve body side; the outer surface of the riser body near the valve body side connection is provided with at least three anti-crack ribs, the anti-crack ribs being integrally formed with the valve body and the riser; and a heat insulation cover, the heat insulation cover being detachably covered on the top of the riser body, the heat insulation cover having a fan-shaped pouring port, and the bottom surface of the heat insulation cover having an inverted conical turbulence column.

[0006] The technical solutions described in this application embodiment have at least the following technical effects: 1. Improved feeding efficiency: The combination of the inverted conical turbulence column and the fan-shaped pouring gate optimizes the flow path of the molten metal, reduces turbulence, and makes feeding more uniform and efficient. 2. Reduced risk of hot cracking: The combination of the anti-crack rib and the neck transition ring enhances structural strength, disperses stress concentration, and reduces the possibility of cracking during the cooling process of the casting. 3. Improved heat preservation performance: The detachable sealing combination of the heat preservation cover and the riser body reduces heat loss and prolongs the solidification time of the molten metal. 4. Optimized molten metal flow control: The progressively deeper design of the spiral groove guides the molten metal to form a stable vortex, and the micropore group of the ventilated structure discharges gas, reducing casting porosity defects.

[0007] In some embodiments, the inverted conical baffle column is connected to the bottom surface of the insulation cover by threads.

[0008] In some embodiments, the surface of the inverted conical spoiler column is provided with a spiral groove, the depth of which gradually increases from the top to the bottom.

[0009] In some embodiments, an annular magnet is embedded in the outer ring of the heat-insulating cover, and a magnetically conductive steel ring is provided at the top of the riser body, wherein the annular magnet and the magnetically conductive steel ring form a polarity matching attraction.

[0010] In some embodiments, a heat insulation layer is provided between the annular magnet and the fan-shaped pouring nozzle.

[0011] In some embodiments, the heat-insulating cover is further provided with a ventilating structure, wherein the ventilating structure is a through hole, and the through hole is radially and evenly distributed.

[0012] In some embodiments, the anti-crack rib extends toward the riser body at a climbing angle of 15°-25° relative to the upper surface of the valve body, and the cross-sectional area of ​​the rib decreases linearly along the extension direction.

[0013] In some embodiments, the cross-section of the anti-crack reinforcement is an isosceles triangle with its apex facing the riser axis. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an exploded structural diagram of the feeding structure provided in the embodiments of this application;

[0016] Figure 2 This is an assembly diagram of the feeding structure provided in an embodiment of this application;

[0017] Figure 3 A cross-sectional view of the feeding structure provided in the embodiments of this application;

[0018] Figure 4 A front view of the insulation cover provided in an embodiment of this application;

[0019] The following are the labeling elements in the figure:

[0020] 1. Riser body; 11. Anti-breakage rib; 12. Magnetic steel ring; 2. Insulation cover; 21. Fan-shaped pouring gate; 22. Turbulence column; 221. Spiral groove; 23. Ring magnet; 24. Heat insulation layer; 25. Breathable structure; 3. Valve body side. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0027] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] Ball valve castings refer to ball valve components formed through a casting process, typically used to control the flow or regulation of fluids. During the casting process, due to the cooling and shrinkage of the molten metal, defects such as shrinkage cavities and porosity can easily form inside the casting, affecting its mechanical properties and sealing performance.

[0029] Feeding refers to the process of adding molten metal to a casting through risers or other structures during the casting process to compensate for solidification shrinkage and reduce internal defects.

[0030] Based on this, in order to improve the problems of low feeding efficiency, easy hot cracking, insufficient heat preservation performance and poor control of molten metal flow and solidification process in related technologies, the embodiments of this application provide the following solutions.

[0031] Please refer to the following: Figures 1 to 4 This application provides a riser including a riser body 1, which is a cylindrical cavity structure with an open top and its bottom connected to the valve body side 3; the outer surface of the riser body 1 near the connection with the valve body side 3 is provided with at least three anti-crack ribs 11, which are integrally formed with the valve body and the riser; and a heat insulation cover 2, which is detachably covered on the top of the riser body 1. The heat insulation cover 2 has a fan-shaped pouring port 21 and an inverted conical baffle column 22 on the bottom surface of the heat insulation cover 2, which is detachably connected to the heat insulation cover 2.

[0032] The anti-crack rib 11 is integrally cast. Its spatial oblique structure requires a three-part mold with a retractable slider. The draft angle of the mold is matched with the rise angle of the anti-crack rib. Using the anti-crack rib 11 can improve the structural rigidity and disperse the cooling shrinkage stress.

[0033] The annular pouring nozzle 21 allows the molten metal to flow in evenly, reducing turbulence.

[0034] The inverted conical turbulence column 22 guides the molten metal to form a stable flow, reducing porosity and inclusions.

[0035] In some embodiments, please refer to Figure 1 and Figure 3 The inverted conical baffle column 22 is connected to the bottom surface of the insulation cover 2 by a thread;

[0036] The threaded connection facilitates disassembly and assembly, and different sizes or shapes of baffles can be replaced according to the needs of different castings. Baffles can also be replaced individually after wear, reducing costs.

[0037] Preferably, a quick-release clip structure can also be used to further improve replacement efficiency.

[0038] In some embodiments, please refer to the following: Figure 1 and Figure 3 The surface of the inverted conical spoiler column 22 is provided with a spiral groove 221, and the depth of the spiral groove 221 gradually increases from the top to the bottom;

[0039] The spiral groove 221 guides the molten metal to form vortices, reducing turbulence. The gradually increasing depth design enhances the driving force for the downward flow of the molten metal.

[0040] Preferably, the groove can adopt a variable pitch design to further optimize the flow.

[0041] In some embodiments, please refer to the following: Figure 3 and Figure 4 The outer ring of the heat preservation cover 2 is embedded with a ring magnet 23, and the top of the riser body 1 is provided with a magnetic steel ring 12. The ring magnet 23 and the magnetic steel ring 13 form a polarity matching adsorption.

[0042] The attraction force between the ring magnet 23 and the magnetic steel ring 13 should be greater than the weight of the insulation cover to ensure automatic alignment and sealing when the mold is closed.

[0043] The magnetic structure ensures that the insulation cover 2 and the riser body 1 fit tightly together, reducing heat loss and thus extending the compression time.

[0044] In some embodiments, please refer to the following: Figure 3 and Figure 4 A heat insulation layer 24 is provided between the annular magnet 23 and the fan-shaped pouring nozzle 21;

[0045] The heat insulation layer 24 can be made of ceramic fiber or high-temperature resistant foam material to prevent the high-temperature molten metal from affecting the magnet and causing high-temperature demagnetization.

[0046] In some embodiments, please refer to Figure 4 The heat insulation cover 2 is also provided with a ventilated structure 25, which is a through hole, and the through holes are evenly distributed radially.

[0047] Through holes allow gas to escape, but molten metal cannot pass through. Radial uniform distribution ensures uniform venting, thereby optimizing the internal quality of the casting by reducing porosity defects.

[0048] In some embodiments, please refer to the following: Figure 1 and Figure 2 The anti-crack rib 11 extends toward the riser body 1 at a climbing angle of 15°-25° relative to the upper surface of the valve body, and the cross-sectional area of ​​the rib decreases linearly along the extension direction.

[0049] The rise angle is mainly used to balance stress transmission and casting demolding.

[0050] Preferably, the cross-sectional area of ​​the rib decreases linearly along the extension direction, with a reduction rate of 20-30% / cm, which can accurately match the solidification shrinkage curve of the ball valve casting. At the same time, compared with the uniform cross-section design, the temperature of the riser neck hot spot can be reduced.

[0051] In some embodiments, please refer to the following: Figure 1 and Figure 2 The cross-section of the anti-crack reinforcement 11 is an isosceles triangle with its apex facing the riser axis.

[0052] A triangular cross-section can provide better stress dispersion and reduce the risk of hot cracking.

[0053] The working principle of this embodiment is as follows: during pouring, the molten metal flows in through the fan-shaped pouring port 21 and is guided by the turbulence column 22 to form a rotating flow. The gas is discharged through the venting structure 25, and the magnetic sealing structure prevents heat loss.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fracture-prevention and feeding structure for ball valve castings, characterized in that, include: Riser body (1), the riser body (1) is a cylindrical cavity structure with an open top, and its bottom is connected to the valve body side (3). The outer surface of the riser body (1) near the valve body side (3) is provided with at least three anti-crack ribs (11), and the anti-crack ribs (11) are integrally formed with the valve body and the riser; The heat insulation cover (2) is detachably covered on the top of the riser body (1). The heat insulation cover (2) has a fan-shaped pouring port (21) and an inverted cone-shaped turbulence column (22) on the bottom surface of the heat insulation cover (2).

2. The feeding structure of claim 1, wherein: The inverted conical turbulence column (22) is connected to the bottom surface of the heat insulation cover (2) by a thread.

3. The feeding structure of claim 2, wherein: The surface of the inverted conical turbulence column (22) is provided with a spiral groove (221), and the depth of the spiral groove (221) gradually increases from the top to the bottom.

4. The feeding structure of claim 1, wherein: The outer ring of the heat-insulating cover (2) is embedded with a ring magnet (23), and the top of the riser body (1) is provided with a magnetic steel ring (12).

5. The feeding structure of claim 4, wherein: A heat insulation layer (24) is provided between the annular magnet (23) and the fan-shaped pouring nozzle (21).

6. The feeding structure of claim 1, wherein: The heat insulation cover (2) is also provided with a breathable structure (25), which is a through hole and the through hole is radially evenly distributed.

7. The feeding structure of claim 1, wherein: The anti-crack rib (11) extends toward the riser body (1) at a climbing angle of 15°-25° relative to the upper surface of the valve body, and the cross-sectional area of ​​the rib decreases linearly along the extension direction.

8. The feeding structure of claim 1, wherein: The cross-section of the anti-crack reinforcement (11) is an isosceles triangle with its apex facing the riser axis.

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