Pouring system and suction part forming system for large pump
By optimizing the flow channel structure of the gating system, the cold shut problem of castings with high height and thin wall thickness in gravity casting was solved, and high-quality forming of castings was achieved.
Patent Information
- Application Number
- CN202522273815.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-10-28
AI Technical Summary
During gravity casting, castings with high height and thin walls are prone to cold shuts, resulting in low yield and quality, which cannot meet the quality requirements of industrial production.
A gating system was designed, including a flow channel extending in the vertical direction and multiple gating channels. By optimizing the channel structure, the melt can be uniformly and quickly filled into the mold cavity, avoiding cold shut defects.
It improves the yield and quality of castings with greater height and thinner walls, reduces the possibility of cold shut defects, and meets the quality requirements of industrial production.
Smart Images
Figure CN223642728U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to foundry technology field especially relates to a pouring system and inhale piece forming system for large -scale pump. BACKGROUND
[0002] Gravity casting as a kind of widely used in metal forming field's casting process, with its simple equipment, convenient operation, relatively low production cost and other advantages, in aerospace, automobile manufacturing, mechanical engineering and many other industrial fields occupies an important position. With the continuous improvement of modern industry to the performance requirements of parts, the structure design of castings also puts forward more stringent requirements, and the castings with high height and thin wall thickness are more and more applied to various key equipment because they can meet the structural strength requirements while realizing lightweight.
[0003] However, when producing castings with high height and thin wall thickness by using gravity casting method, technicians generally face many challenges, and cold shut problem is particularly prominent. Cold shut problem specifically shows that there are unfilled cavities or gaps formed by insufficient fusion of melt in the castings, and the existence of such defects directly affects the quality and performance of the castings. The castings with cold shut defects often have obvious deficiencies in mechanical properties, such as reduced strength and poor toughness, which are difficult to meet the use requirements of design and application, greatly reduce the yield of castings, increase the production cost, and even may lead to the scrap of the whole batch of castings, causing great economic loss to the production enterprises.
[0004] The generation of cold shut problem is closely related to the structural characteristics of castings with high height and thin wall thickness. In the casting process, the melt needs to flow along the mold cavity and fill the entire mold cavity under the action of gravity. For castings with high height, the melt needs to overcome greater flow resistance during flow, and the flow path is longer. The structure with thin wall thickness makes the contact area between the melt and the mold cavity wall relatively large, and the heat loss speed is accelerated. The two factors work together, causing the melt to cool down too quickly during flow. When the temperature of the melt decreases to a certain extent, its flowability will decrease significantly, and it may even partially solidify before reaching some parts of the mold cavity, so that it cannot fully fill the entire mold cavity, and finally forms a cold shut defect.
[0005] In summary, when gravity casting castings with high height and thin wall thickness, the existence of cold shut problem seriously restricts the yield and quality of the castings, and cannot meet the urgent needs of industrial production for high-quality castings. Therefore, how to effectively overcome the cold shut problem has become an important technical problem to be solved by the technical personnel in the field. INVENTION CONTENTS
[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a casting system and a suction component forming system for large pumps, which can solve the problem of low casting yield and quality caused by cold shut when casting castings with high height and thin wall thickness.
[0007] The specific technical solution of this utility model embodiment is as follows:
[0008] A gating system, the gating system comprising:
[0009] A flow channel extending vertically;
[0010] The first gating channel has an inlet connected to a first position of the flow channel, and an outlet connected to the mold cavity.
[0011] The second gating channel has an inlet connected to a second position of the flow channel, and an outlet connected to the mold cavity. The inlet to outlet of the second gating channel tends to extend upwards, with the first position lower than the second position and the outlet of the second gating channel higher than the outlet of the first gating channel. The casting formed in the mold cavity has at least a partially annular thin-walled structure, with the first gating channel connected to the lower side of the thin-walled structure and the second gating channel connected to the upper side of the thin-walled structure.
[0012] Preferably, there are multiple second casting channels, and the multiple second casting channels are circumferentially distributed around the flow channel;
[0013] In the horizontal direction, the outlets of the multiple second gating channels extend spirally in the circumferential direction in either a counterclockwise or clockwise direction. At the same time, at the position where the second gating channel connects to the mold cavity, the second gating channel is tangent to the side wall of the mold cavity.
[0014] The thin-walled structure of the casting is in the shape of an inverted trumpet, and the upper side of the thin-walled structure is connected to a first thick-walled structure that expands upward and outward in an at least partially annular shape. The second pouring channel is connected to the inner side of the first thick-walled structure formed in the mold cavity.
[0015] The lower side of the thin-walled structure is connected to an outward-facing, at least partially annular, second thick-walled structure, and the first casting channel is connected to the second thick-walled structure.
[0016] Preferably, the outlet of the second pouring channel is inclined upward and has a preset angle with the horizontal plane, the preset angle being between 10 degrees and 20 degrees.
[0017] Preferably, the gating system further includes: a horizontal flow channel, one end of which is connected to the flow channel;
[0018] An overflow channel extending vertically, the bottom end of which is connected to the horizontal channel, and the top end of which is connected to the atmosphere; the first casting channel is connected to the area between the through channel and the overflow channel of the horizontal channel.
[0019] The outlet of the first gating channel into the mold cavity is flat to increase the flow rate of the casting material into the mold cavity.
[0020] Preferably, the horizontal flow channel extends in a straight line so that fluid that just begins to flow into the horizontal flow channel from one end flows preferentially to the other end of the horizontal flow channel.
[0021] Preferably, the overflow channel has at least a sub-overflow channel and an exhaust channel located above the sub-overflow channel, the exhaust channel being in communication with the atmosphere, the radial cross-sectional area of the exhaust channel being smaller than the radial cross-sectional area of the sub-overflow channel, and the bottom end of the exhaust channel being lower than the highest point of the casting formed in the mold cavity;
[0022] The ratio of the radial cross-sectional area of the sub-overflow channel to the radial cross-sectional area of the exhaust channel ranges from 4 to 36.
[0023] Preferably, there are at least two horizontal flow channels, which are circumferentially distributed around the flow channel; there are multiple first casting channels, and each horizontal flow channel is connected to at least one first casting channel.
[0024] Preferably, each of the horizontal flow channels is connected to two second pouring flow channels, and the two second pouring flow channels are located on both sides of the same position of the horizontal flow channel.
[0025] A suction component forming system for a large pump, the suction component forming system for a large pump comprising:
[0026] Any of the gating systems described above;
[0027] A cavity forming assembly is provided, wherein a cavity shaped like the suction member is formed, the axis of the cavity is arranged vertically, the flow channel passes through the middle of the cavity vertically, the first gating channel is connected to the bottom of the cavity, and the second gating channel is connected to the middle of the cavity, which has a narrowing structure.
[0028] Preferably, the inhalation component is made of duplex stainless steel, specifically conforming to ASTM A890 / A890M standards;
[0029] The mold cavity forming assembly further includes: at least one heat-absorbing element disposed in the molding material between two adjacent regions corresponding to the outlet of the second gating channel; and at least one heating riser disposed in the molding material between two adjacent regions corresponding to the outlet of the second gating channel.
[0030] The technical solution of this utility model has the following significant beneficial effects:
[0031] During casting, the molten casting material is injected into the upper end of the flow channel. Since the first position is lower than the second position, the casting material first reaches the first casting channel through the flow channel, and then enters the mold cavity through the outlet of the first casting channel. As the casting material is continuously injected, it flows upward from the lower end of the mold cavity. When the casting material is about to reach the second position, at least a portion of the casting material in the flow channel enters the second casting channel. Subsequently, when the casting material in the mold cavity is about to reach the height where the outlet of the second casting channel connects to the mold cavity, the casting material entering the second casting channel flows upward from the outlet of the second casting channel into the mold cavity, thus flowing towards the upper part of the mold cavity. The casting material continuously flows into the mold cavity from the first and second casting channels until the mold cavity is completely filled. In this way, the casting material can fill the entire mold cavity smoothly, evenly and quickly. For castings with a relatively high height and thin wall thickness that have at least a partially annular structure, the possibility of cold shuts in the casting can be greatly reduced, thereby improving the quality of the casting. Attached Figure Description
[0032] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.
[0033] Figure 1 This is a schematic diagram of the casting system in an embodiment of the present invention;
[0034] Figure 2 This is a schematic diagram showing the positions of the gating system and the formed casting in an embodiment of this utility model;
[0035] Figure 3 This is a schematic diagram of the structure of the casting produced by the gating system in this embodiment of the present invention;
[0036] Figure 4 This is a cross-sectional view of the casting in an embodiment of this utility model.
[0037] The reference numerals in the above figures are as follows:
[0038] 1. Flow channel; 2. Second gating channel; 3. First gating channel; 4. Horizontal channel; 5. Overflow channel; 51. Sub-overflow channel; 52. Exhaust channel; 6. Heat-absorbing component; 7. Heat-generating riser; 100. Casting; 101. Thin-walled structure; 102. First thick-walled structure; 103. Second thick-walled structure. Detailed Implementation
[0039] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.
[0040] To address the problem of low casting yield and quality caused by cold shuts when casting high-height, thin-walled parts, this application proposes a gating system. Figure 1 This is a schematic diagram of the casting system in an embodiment of the present invention. Figure 2 This is a schematic diagram showing the positions of the gating system and the formed casting in an embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of the casting produced by the gating system in an embodiment of this utility model. Figure 4 This is a cross-sectional view of the casting in an embodiment of this utility model, such as... Figures 1 to 4 As shown, the gating system may include: a vertically extending flow channel 1; a first gating channel 3, the inlet of which is connected to a first position of the flow channel 1, and the outlet of which is connected to a mold cavity; a second gating channel 2, the inlet of which is connected to a second position of the flow channel 1, and the outlet of which is connected to a mold cavity, wherein the inlet to outlet of the second gating channel 2 tends to extend upward, the first position being lower than the second position, and the outlet of the second gating channel 2 being higher than the outlet of the first gating channel 3; the casting formed in the mold cavity has at least a partially annular thin-walled structure, the first gating channel 3 is connected to the lower side of the thin-walled structure 101, and the second gating channel 2 is connected to the upper side of the thin-walled structure 101.
[0041] During casting, the molten casting material is injected into the upper end of the flow channel 1. Since the first position is lower than the second position, the casting material first reaches the first casting channel 3 through the flow channel 1, and then enters the mold cavity through the outlet of the first casting channel 3. As the casting material is continuously injected, it flows upward from the lower end of the mold cavity, passing through the thin-walled structure 101. When the casting material is about to reach the first position, at least a portion of the casting material in the flow channel 1 enters the second casting channel 2. Then, when the casting material in the mold cavity is about to reach the height where the outlet of the second casting channel 2 connects to the mold cavity, the casting material entering the second casting channel 2 flows upward from the outlet of the second casting channel 2 into the mold cavity, thus flowing directly to the upper part of the mold cavity without passing through the thin-walled structure 101. The casting material continuously flows into the mold cavity from the second casting channel 2 and the first casting channel 3 until the mold cavity is completely filled. In this way, the casting material can fill the entire mold cavity smoothly, evenly and quickly. For castings 100 with high height and thin wall thickness, the possibility of cold shuts in castings 100 can be greatly reduced, thereby improving the quality of castings 100.
[0042] like Figures 1 to 4 As shown, the flow channel 1 extends vertically. The upper end of the flow channel 1 is the inlet for the casting material. For the casting 100 formed in the mold cavity, which has at least a partially annular thin-walled structure, the flow channel 1 can pass through the middle of the mold cavity, allowing the casting material in the flow channel 1 to flow relatively evenly to various positions within the mold cavity. The inlet of the second pouring channel 2 communicates with the second position of the flow channel 1. The outlet of the second pouring channel 2 is used to connect with the mold cavity to inject the casting material flowing from the flow channel 1 into the second pouring channel 2 into the mold cavity. The second pouring channel 2 is connected to the upper side of the thin-walled structure 101. The second pouring channel 2 is connected to the side wall of the flow channel 1. The inlet to outlet of the second gating runner 2 has an upward trend. On the one hand, it is necessary to ensure that the casting material in the flow channel 1 continues to flow downward first, preventing the casting material in the mold cavity from entering the second gating runner 2 and being injected into the mold cavity from the second gating runner 2 before reaching the first position height. On the other hand, it is necessary to ensure that the casting material flowing out of the outlet of the second gating runner 2 has an upward trend to avoid impact with the casting material entering the mold cavity from the first gating runner 3 and flowing upward.
[0043] As a feasible option, such as Figure 1As shown, there can be one second gating channel 2. Alternatively, there can be multiple second gating channels 2, which are distributed circumferentially around the gating channel 1. This allows the casting material to fill the mold cavity more evenly and quickly at various positions in the circumferential direction. The arrangement of multiple second gating channels 2 is particularly suitable for castings 100 formed in the mold cavity that have at least a partially annular thin-walled structure.
[0044] As a feasible solution, to allow the casting material to fill the mold cavity more quickly at various positions in the circumferential direction, the outlets of multiple second gating channels 2 extend spirally in the circumferential direction in both a counterclockwise and clockwise direction. Furthermore, to reduce the resistance of the casting material flowing into the mold cavity from the outlets of the second gating channels 2, and to make the flow rate of the casting material in the mold cavity faster and more stable, at the location where the second gating channel 2 connects to the mold cavity, the second gating channel 2 is tangential to the sidewall of the mold cavity. Additionally, as... Figure 3 and Figure 4 As shown, the thin-walled structure 101 of the casting 100 is in the shape of an inverted trumpet, and the upper side of the thin-walled structure 101 is connected to the first thick-walled structure 102, which expands upward and outward and is at least partially annular. The second gating channel 2 is connected to the inner side of the first thick-walled structure 102 formed in the mold cavity. In this way, the mold cavity above the thin-walled part can be mainly filled by the casting material input by the second gating channel 2, so as to avoid the casting material input by the first gating channel 3 from failing to fill the entire mold cavity.
[0045] Since the mold cavity below the outlet of the second gating channel 2 is already essentially filled with the casting material flowing out when the casting material exits from the outlet of the second gating channel 2, the outlet of the second gating channel 2 is inclined upwards at a preset angle to the horizontal plane, between 10 and 20 degrees, in order to allow the casting material flowing out from the outlet of the second gating channel 2 to flow upwards more effectively and fill the upper part of the mold cavity more quickly and efficiently. Furthermore, the height difference between the inlet and outlet of the second gating channel 2 can be between 60 mm and 80 mm. To ensure the flow rate of the casting material in the second gating channel 2, the cross-section of the second gating channel 2 can be circular with a diameter between 60 mm and 100 mm.
[0046] like Figures 1 to 4As shown, the inlet of the first gating channel 3 is connected to the first position of the flow channel 1, and the outlet of the first gating channel 3 is used to connect to the mold cavity. The first position is lower than the second position. The outlet of the first gating channel 3 is used to connect to the mold cavity. The first gating channel 3 is connected to the lower side of the thin-walled structure 101. For example, the lower side of the thin-walled structure 101 is connected to an outwardly facing, at least partially annular, second thick-walled structure 103, and the first gating channel 3 is connected to the second thick-walled structure 103. Generally, the outlet of the first gating channel 3 is connected to the bottom of the mold cavity, and the cross-section of the first gating channel 3 is circular. The outlet of the first gating channel 3 can be oriented upward to facilitate the flow of casting material into the mold cavity from bottom to top. The outlet of the second gating channel 2 is higher than the outlet of the first gating channel 3, so that the casting material preferentially flows into the mold cavity from the outlet of the first gating channel 3.
[0047] In order to increase the flow rate of the casting material from the outlet of the first casting channel 3 into the mold cavity, it is feasible to make the outlet of the first casting channel 3 flat.
[0048] As a feasible option, such as Figures 1 to 4 As shown, there can be one first gating channel 3. Alternatively, there can be multiple first gating channels 3, which are distributed circumferentially around the gating channel 1. This allows the casting material to fill the mold cavity more evenly and quickly at various positions in the circumferential direction. The arrangement of multiple first gating channels 3 is particularly suitable for castings 100 formed in the mold cavity that have at least a partially annular thin-walled structure.
[0049] As a feasible option, such as Figure 1 and Figure 2 As shown, the gating system also includes a horizontal runner 4. One end of the horizontal runner 4 is connected to the flow channel 1. The first gating runner 3 is connected to the flow channel 1 through the horizontal runner 4.
[0050] As a feasible option, such as Figure 1 and Figure 2As shown, the gating system may include an overflow channel 5 extending vertically. The bottom end of the overflow channel 5 is connected to the horizontal channel 4, and the top end of the overflow channel 5 is open to the atmosphere. The first gating channel 3 is connected in the area between the through channel 1 of the horizontal channel 4 and the overflow channel 5. When the casting material is injected from the through channel 1, it first flows downward into the horizontal channel 4. Under the action of inertia, the casting material preferentially flows in the horizontal channel 4 to the other end of the horizontal channel 4, until it reaches the overflow channel 5. At this time, impurities and slag in the casting material will enter the overflow channel 5. Afterward, the casting material in the horizontal channel 4 will enter the mold cavity through the first gating channel 3. In this way, on the one hand, it can play a role in slag collection, reducing the possibility of impurities and slag in the casting material entering the mold cavity, thereby improving the casting quality. On the other hand, it can ensure that the fluid can flow stably into the mold cavity, avoiding eddies and turbulence.
[0051] In order to ensure that the fluid that initially flows into the horizontal channel 4 from one end to the other end of the horizontal channel 4 preferentially flows to the other end of the horizontal channel 4, it is feasible to extend the horizontal channel 4 in a straight line.
[0052] Furthermore, such as Figure 1 As shown, the overflow channel 5 has at least a sub-overflow channel 51 and an venting channel 52 located above the sub-overflow channel 51. The radial cross-sectional area of the venting channel 52 is smaller than that of the sub-overflow channel 51, and the bottom end of the venting channel 52 is lower than the highest point of the casting 100 formed in the mold cavity. By means of the above method, the amount of casting material entering the venting channel 52 in the later stages of pouring can be effectively reduced, thus helping to reduce waste of casting material. In a preferred embodiment, the ratio of the radial cross-sectional area of the sub-overflow channel 51 to the radial cross-sectional area of the venting channel 52 is between 4 and 36.
[0053] To ensure that the casting material in the horizontal runner 4 flows relatively evenly into the first runner 3 and then into the mold cavity, a feasible approach is as follows: Figure 1 and Figure 2 As shown, there are at least two horizontal runners 4, which are circumferentially distributed around the runner 1. Each horizontal runner 4 is connected to at least one first gating runner 3. Furthermore, to reduce the number of horizontal runners 4, each horizontal runner 4 is connected to two first gating runners 3, with the two first gating runners 3 located on opposite sides of the same position on the horizontal runner 4. This ensures that the casting material in each horizontal runner 4 flows evenly into the two first gating runners 3, thus entering the mold cavity evenly.
[0054] The gating system in this application is applicable to castings 100 that are relatively tall and thin-walled, and is particularly suitable for castings 100 that have a thin-walled structure that is at least partially annular. Preferably,Figure 3 This is a schematic diagram of the structure of the casting produced by the gating system in an embodiment of this utility model, as shown below. Figure 3 As shown, the gating system of this application is particularly suitable for castings 100 with flared openings at both ends and a narrowed middle section, such as suction components for large pumps. The outlet of the second gating channel 2 can communicate with the narrowed middle section of the casting 100.
[0055] This application also proposes a suction component molding system for a large pump, which may include: a gating system as described above; a cavity forming assembly capable of forming a cavity in the shape of the suction component, the axis of the cavity being arranged vertically, the flow channel 1 passing through the middle of the cavity vertically, the first gating channel 3 communicating with the bottom of the cavity, and the second gating channel 2 communicating with the middle of the cavity having a narrowed diameter structure. The narrowed diameter structure of the cavity may be located near the thin wall of the cavity in the vertical direction or above the thin wall.
[0056] As a viable option, the casting material used for the suction component can preferably be duplex stainless steel, specifically conforming to ASTM A890 / A890M. This material is a ferritic-austenitic stainless steel that combines the most beneficial properties of many ferritic and austenitic steels. Due to its high chromium and molybdenum content, it exhibits excellent resistance to pitting corrosion, crevice corrosion, and uniform corrosion. The duplex microstructure ensures that the material has high resistance to stress corrosion cracking and also high mechanical strength.
[0057] As a feasible option, such as Figure 2 As shown, the mold cavity forming assembly may further include at least one heat-absorbing element. To allow the casting material between two adjacent areas in the mold cavity corresponding to the outlet of the second gating channel 2 to cool and solidify first, a heat-absorbing element 6, such as a chill, is provided in the molding material within the casting mold. The heat-absorbing element 6 is in contact with the mold cavity to absorb heat from the casting material in the mold cavity. The heat-absorbing element 6 is positioned between two adjacent areas corresponding to the outlet of the second gating channel 2. There may be one or more heat-absorbing elements 6, depending on actual needs. The purpose is to prevent the molten metal flowing from the lower first gating channel 3 from impacting the molten metal in the second gating channel, thus achieving a bottom-up pouring sequence and sequential cooling.
[0058] The mold cavity forming assembly may further include at least one heating riser 7. In order to delay the cooling time of the casting material between two adjacent regions in the mold cavity that are opposite to the outlet of the first gating channel 3, and to prevent the casting material from cooling too quickly and hindering its upward flow to the thin wall of the mold cavity, the heating riser 7 may be provided in the molding material between two adjacent regions that are opposite to the outlet of the first gating channel 3.
[0059] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.
[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A casting system, characterized in that, The gating system includes: A flow channel extending vertically; The first gating channel has an inlet connected to a first position of the flow channel, and an outlet connected to the mold cavity. The second gating channel has an inlet connected to a second position of the flow channel, and an outlet connected to the mold cavity. The inlet to outlet of the second gating channel tends to extend upwards, with the first position lower than the second position and the outlet of the second gating channel higher than the outlet of the first gating channel. The casting formed in the mold cavity has at least a partially annular thin-walled structure, with the first gating channel connected to the lower side of the thin-walled structure and the second gating channel connected to the upper side of the thin-walled structure.
2. The casting system according to claim 1, characterized in that, There are multiple second casting channels, and the multiple second casting channels are circumferentially distributed around the flow channel; In the horizontal direction, the outlets of the multiple second gating channels extend spirally in the circumferential direction in either a counterclockwise or clockwise direction. At the same time, at the position where the second gating channel connects to the mold cavity, the second gating channel is tangent to the side wall of the mold cavity. The thin-walled structure of the casting is in the shape of an inverted trumpet, and the upper side of the thin-walled structure is connected to a first thick-walled structure that expands upward and outward in an at least partially annular shape. The second pouring channel is connected to the inner side of the first thick-walled structure formed in the mold cavity. The lower side of the thin-walled structure is connected to an outward-facing, at least partially annular, second thick-walled structure, and the first casting channel is connected to the second thick-walled structure.
3. The casting system according to claim 1, characterized in that, The outlet of the second pouring channel is inclined upward and has a preset angle with the horizontal plane, the preset angle being between 10 degrees and 20 degrees.
4. The casting system according to claim 1, characterized in that, The gating system further includes: a horizontal flow channel, one end of which is connected to the flow channel; An overflow channel extending vertically, the bottom end of which is connected to the horizontal channel, and the top end of which is connected to the atmosphere; the first casting channel is connected to the area between the through channel and the overflow channel of the horizontal channel. The outlet of the first gating channel into the mold cavity is flat to increase the flow rate of the casting material into the mold cavity.
5. The casting system according to claim 4, characterized in that, The horizontal flow channel extends in a straight line so that fluid that just begins to flow into the horizontal flow channel from one end flows preferentially to the other end of the horizontal flow channel.
6. The casting system according to claim 4, characterized in that, The overflow channel has at least a sub-overflow channel and an exhaust channel located above the sub-overflow channel. The exhaust channel is in communication with the atmosphere. The radial cross-sectional area of the exhaust channel is smaller than the radial cross-sectional area of the sub-overflow channel. The bottom end of the exhaust channel is lower than the highest point of the casting formed in the mold cavity. The ratio of the radial cross-sectional area of the sub-overflow channel to the radial cross-sectional area of the exhaust channel ranges from 4 to 36.
7. The gating system according to claim 4, characterized in that, There are at least two horizontal flow channels, and the at least two horizontal flow channels are circumferentially distributed around the flow channel; there are multiple first casting channels, and each of the horizontal flow channels is connected to at least one first casting channel.
8. The gating system according to claim 7, characterized in that, Each of the horizontal runners is connected to two second gating runners, which are located on opposite sides of the same position of the horizontal runners.
9. A suction component molding system for a large pump, characterized in that, The suction component forming system for the large pump includes: The gating system as described in any one of claims 1 to 8; A cavity forming assembly is provided, wherein a cavity shaped like the suction member is formed, the axis of the cavity is arranged vertically, the flow channel passes through the middle of the cavity vertically, the first gating channel is connected to the bottom of the cavity, and the second gating channel is connected to the middle of the cavity, which has a narrowing structure.
10. The suction component forming system for a large pump according to claim 9, characterized in that, The suction component is made of duplex stainless steel, specifically conforming to ASTM A890 / A890M standards. The mold cavity forming assembly further includes: at least one heat-absorbing element disposed in the molding material between two adjacent regions corresponding to the outlet of the second gating channel; and at least one heating riser disposed in the molding material between two adjacent regions corresponding to the outlet of the first gating channel.