Fan impeller casting mold

Abstract

The utility model relates to the technical field of graphite type vacuum casting, in particular to a fan impeller casting mold which comprises an upper casting mold and a lower casting mold. Wherein the upper center of the upper casting mold is provided with a core hanging ring casting mold; wherein an impeller pouring cavity is formed between the upper casting mold and the lower casting mold, and a plurality of long and short blade core casting molds are arranged in the impeller pouring cavity; wherein the long and short blade core casting molds are annularly arrayed by taking the center of the core lifting ring casting mold as a circle center; the sprue gate is formed in the center of the upper part of the core hanging ring casting mold, and the bottom end is communicated with the impeller pouring cavity; wherein a plurality of lower mold exhaust holes are evenly distributed in the surface of the lower mold, a plurality of lower mold exhaust grooves are formed in the bottom face of the lower mold in an annular array mode, and the two ends of each lower mold exhaust hole communicate with the impeller pouring cavity and the corresponding lower mold exhaust groove correspondingly.

Description

Technical Field

[0001] The present application generally relates to the technical field of graphite vacuum casting, and in particular to a fan impeller casting mold. Background Art

[0002] Graphite molds are widely used in the casting field due to their excellent thermal conductivity, high temperature resistance and good processability, especially in the casting of non-ferrous metals such as aluminum and copper. However, during the casting process, graphite materials may release gas under the action of high-temperature molten metal, which has a significant impact on the quality of castings.

[0003] During the casting process, the temperature of the metal liquid is usually as high as 600℃ or above. In such a high temperature environment, the graphite material will undergo a certain degree of thermal decomposition, releasing volatile gases such as water vapor, CO, The release of these gases is inevitable to a certain extent. However, if the gases fail to be discharged from the mold in time, it is likely to cause defects in the casting, such as pores, bubbles and shrinkage. These problems seriously affect the strength, toughness and service life of the casting.

[0004] Traditional graphite mold designs often fail to adequately consider gas exhaust requirements. Many molds lack effective exhaust systems, leading to gas accumulation inside the mold. When the gas is subjected to the intense pressure of the liquid metal, high-pressure areas form, which in turn generate bubbles and ultimately lead to the formation of gas inclusions. These gas inclusions not only reduce the density of the casting but can also cause surface defects such as depressions and air pockets, seriously affecting the appearance and performance of the casting. Utility Model Content

[0005] In order to solve the problem that high temperature during casting of existing large fan impeller graphite molds causes a large amount of graphite to release gas, and the poor exhaust effect leads to a large number of shrinkage holes and surface microcracks in the casting, the present application provides a fan impeller casting mold, which improves the exhaust effect during casting and improves the quality of the casting.

[0006] According to one aspect of the present application, a fan impeller casting mold is provided, comprising: an upper mold and a lower mold; wherein a core hanging ring mold is provided at the upper center of the upper mold; wherein an impeller casting cavity is formed between the upper mold and the lower mold, and a plurality of long and short blade core molds are provided in the impeller casting cavity; wherein the plurality of long and short blade core molds are arranged in a circular array with the center of the core hanging ring mold as the center of the circle; and a pouring gate, which is arranged at the upper center of the core hanging ring mold, and the bottom end is connected to the impeller casting cavity; wherein a plurality of lower mold exhaust holes are evenly distributed on the surface of the lower mold, and a plurality of lower mold exhaust grooves are provided in a circular array on the bottom surface of the lower mold, and the two ends of the lower mold exhaust holes are respectively connected to the impeller casting cavity and the lower mold exhaust groove.

[0007] In some embodiments, the long and short blade core mold includes: a short blade mold and a long blade mold; wherein the short blade mold includes a first strip body, and a first wedge block and a second wedge block are respectively centrally provided on both end surfaces of the first strip body; wherein the second wedge block is connected to the lower mold, and the first wedge block is connected to the long blade mold.

[0008] In some embodiments, the long blade mold includes a second strip body, the second strip body is spaced apart on one side of the first strip body, and one end of the second strip body is provided with a third wedge block, and the third wedge block is connected to the lower mold; wherein the other end of the second strip body is provided with an assembly block, the assembly block is connected to the core hanging ring mold at one end away from the second strip body, and a first wedge groove is provided at one end close to the second strip body, and the first wedge groove and the second strip body are spaced apart in the horizontal direction at the end face of the assembly block; wherein each assembly block is annularly arrayed at the lower part of the pouring gate to form a diversion cavity, and the bottom end of the diversion cavity is connected to the space between the lower mold and the long and short blade core mold; a first short blade groove is provided on the end face of the assembly block located between the first wedge groove and the second strip body; wherein the gap between the first strip body and the second strip body forms a second short blade groove, and the first short blade groove is connected to the second short blade groove to form a short blade casting groove.

[0009] In some embodiments, a first long blade groove is further provided on the side of the assembly block close to the second strip body, and a side of the second strip body away from the second short blade groove is adjacent to the first strip body of another group of long and short blade core casting molds, and a second long blade groove is formed between the side of the second strip body away from the second short blade groove and the other group of first strip bodies. The first long blade groove is connected with the second long blade groove and forms a long blade casting groove; wherein the first long blade groove is composed of a first side groove and a second side groove, and the first side groove and the second side groove form a U-shaped groove, and the U-shaped groove opens toward the second long blade groove, and the first side groove is arranged on the side of the assembly block close to the second strip body, and the second side groove is arranged on the side of the assembly block close to the first strip body; wherein the top surface and the bottom surface of the short blade casting groove and the long blade casting groove are both spaced apart from the upper casting mold and the lower casting mold.

[0010] In some embodiments, the core lifting ring mold includes: a lifting ring body, the upper part of the inner ring of the lifting ring body is connected to the pouring port; the bottom surface of the lifting ring body has a plurality of assembly grooves in an annular array, and the assembly block is arranged in the assembly groove at one end away from the first plate body and the second plate body; wherein the assembly block extends toward the pouring port at one end away from the first plate body and the second plate body; a threaded hole is provided on the surface of the lifting ring body, the threaded hole passes through the lifting ring body and the assembly block, and the lifting ring body and the assembly block are screw-connected; and the upper outer wall of the lifting ring body is provided with a convex ring, and the outer wall of the lifting ring body and the top of the assembly block is provided with an upper mold riser mold; wherein the top of the upper mold riser mold is connected to the bottom surface of the convex ring; the bottom surface of the upper mold riser mold has a plurality of shrinkage feeding grooves in an annular array with the center of the lifting ring body as the center, the side walls of the shrinkage feeding grooves are connected to the outer wall of the assembly block, and the bottom ends of the shrinkage feeding grooves are connected to the upper space of the long and short blade core mold; the top surface of the shrinkage feeding groove is provided with a plurality of upper mold riser exhaust holes, and the two ends of the upper mold riser exhaust holes are respectively connected to the shrinkage feeding groove and the external space of the upper mold riser mold.

[0011] In some embodiments, the upper mold is an annular plate, and a number of upper mold exhaust holes are evenly distributed on the surface of the upper mold; the inner ring of the upper mold extends toward the upper mold riser mold; the bottom surface of the upper mold riser mold is also provided with an annular groove, and the inner ring of the upper mold is arranged in the annular groove; the outer ring of the upper mold is connected to the lower mold.

[0012] In some embodiments, the lower casting mold includes a bottom plate and an annular side plate; wherein the bottom plate is arranged at the bottom end of the annular side plate; the lower mold exhaust holes are evenly distributed on the surface of the bottom plate, and the lower mold exhaust grooves are arranged in an annular array on the bottom surface of the bottom plate; the outer ring of the upper casting mold is arranged on the inner wall of the top end of the annular side plate; wherein the inner wall of the annular side plate has a plurality of second wedge grooves in an annular array with the center of the annular side plate as the center of the circle, and adjacent second wedge blocks and third wedge blocks are arranged in two adjacent second wedge grooves.

[0013] In some embodiments, a diverter column is provided at the lower part of the pouring port; a plurality of diverter channels are arranged in an annular array on the surface of the diverter column, the top of each diverter channel is connected to the pouring port, the lower end is connected to the bottom end of the diverter cavity, and the outer wall of the diverter column is connected to the inner wall of the diverter cavity; a hollow graphite core is provided at the bottom end of the diverter column, and the bottom end of the hollow graphite core is connected to the center of the bottom plate.

[0014] In some embodiments, the bottom plate extends along the bottom surface of the long and short blade core mold, the center of the bottom plate is sunken and provided with a slow flow cavity, and the bottom end of the hollow graphite core is connected to the center of the slow flow cavity; wherein each diversion channel is vertically projected within the slow flow cavity; the upper part of the slow flow cavity is connected to the diversion channel, and the side wall is connected to the gap between the long and short blade core mold and the bottom plate.

[0015] In some embodiments, a hollow graphite core exhaust groove is provided on the bottom surface of the bottom plate located at the lower part of the slow flow chamber, and the bottom surface of the hollow graphite core exhaust groove is open. One end of the hollow graphite core exhaust groove is connected to the inner wall of the hollow graphite core, and the other end passes through the bottom plate at the lower part of the outer wall of the slow flow chamber.

[0016] The embodiments of the present application have the following advantages.

[0017] The independent long and short blade core molds are installed in a circular array on the outer wall of the core hanging ring mold with the center of the core hanging ring mold as the center of the circle. After the long and short blade core molds are installed, the core hanging ring mold will be lifted and placed above the lower mold. The upper mold will be moved from the top of the core hanging ring mold to the lower mold, and finally the upper mold and the lower mold buckle will be positioned. The upper mold, the long and short blade core mold, and the lower mold are respectively spaced apart to form an impeller casting cavity. The grooves on the surface of the long and short blade core molds form the blades of the impeller after the casting is completed. After the casting process, the molten metal is injected into the pouring port. The molten metal flows downward along the center of the core hanging ring mold, diffuses to the surrounding areas along the surface of the lower mold after encountering the lower mold, and finally moves upward through the edge of the lower mold and the grooves of the long and short blade core molds. Since the graphite mold will produce a large amount of gas when pouring high-temperature molten metal, when the molten metal moves on the surface of the lower mold, the gas generated by the graphite mold is exhausted downward through a large number of lower mold exhaust holes. The lower mold exhaust groove runs through the lower mold horizontally, so that the gas discharged from the lower mold exhaust hole is discharged from the lower mold exhaust groove from the bottom surface of the lower mold to the outside of the mold, thereby realizing unimpeded exhaust of the mold and no gas gathering on the bottom surface of the mold.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0019] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 A schematic diagram of the appearance of a fan impeller mold according to an embodiment of the present application is shown.

[0022] Figure 2 A schematic diagram of the lower casting mold structure according to an embodiment of the present application is shown.

[0023] Figure 3 A schematic diagram of pouring nozzle installation according to an embodiment of the present application is shown.

[0024] Figure 4 Show Figure 3 Cross-sectional view in the AA direction.

[0025] Figure 5 A schematic diagram of the installation of long and short blade core casting molds according to an embodiment of the present application is shown.

[0026] Figure 6 A schematic diagram of a long blade casting structure according to an embodiment of the present application is shown.

[0027] Figure 7 A schematic diagram of a short blade casting structure according to an embodiment of the present application is shown.

[0028] Figure 8 A schematic diagram of assembly block installation according to an embodiment of the present application is shown.

[0029] Figure 9 Show Figure 8 Magnified view of area A in center.

[0030] Figure 10 A schematic diagram of the installation of an upper mold riser mold according to an embodiment of the present application is shown.

[0031] Figure 11 Show Figure 10 Cross-sectional view in the BB direction.

[0032] Figure 12 A schematic diagram of the base plate structure according to an embodiment of the present application is shown.

[0033] Figure 13 A schematic diagram of a core hanging ring casting structure according to an embodiment of the present application is shown.

[0034] Figure 14 A schematic diagram of the core hanging ring casting mold installation according to an embodiment of the present application is shown.

[0035] Reference numerals

[0036] 1-upper mold; 11-upper mold exhaust hole; 12-annular groove;

[0037] 2-lower casting mold; 21-bottom plate; 22-annular side plate; 23-lower mold exhaust hole; 24-lower mold exhaust groove; 25-second wedge groove; 26-slow flow cavity; 27-hollow graphite core exhaust groove;

[0038] 3-core lifting ring casting mold; 31-lifting ring body; 32-assembly groove; 33-threaded hole; 34-convex ring;

[0039] 4-long and short blade core mold; 41-short blade mold; 42-long blade mold;

[0040] 411 - first strip body; 412 - first wedge block; 413 - second wedge block; 414 - first short blade slot; 415 - second short blade slot;

[0041] 421 - second strip body; 422 - third wedge block; 423 - assembly block; 424 - first wedge groove; 425 - first long blade groove; 426 - second long blade groove; 427 - first side groove; 428 - second side groove;

[0042] 5- pouring gate; 51- diverter column; 52- diverter channel; 53- diverter cavity; 54- hollow graphite core;

[0043] 6-upper mold riser; 61-feeding groove; 62-upper mold riser vent;

[0044] 7-Impeller; 8-Hub; 9-Front cover; 10-Rear cover; 11-Short blades; 12-Long blades; 13-Mouth ring. DETAILED DESCRIPTION

[0045] In order to make the purpose, scheme and advantages of the technical solution of this application clearer, the following will be combined with the drawings of the specific embodiments of this application to clearly and completely describe the technical solution of the embodiment of this application. Unless otherwise specified, the terms used in this article have the common meanings in the art. The same reference numerals in the drawings represent the same components.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0047] As described above, during the casting process of traditional graphite impeller molds, since the graphite mold releases gas when heated, the traditional mold structure has poor exhaust effect, and pores and bubbles may form in the metal liquid. These pores and bubbles will reduce the density of the casting and affect its mechanical properties and corrosion resistance.

[0048] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an example embodiment of the present application provides a fan impeller casting mold, which includes: an upper mold and a lower mold; wherein a core hanging ring mold is provided at the upper center of the upper mold; wherein an impeller casting cavity is formed between the upper mold and the lower mold, and a plurality of long and short blade core molds are provided in the impeller casting cavity; wherein the plurality of long and short blade core molds are arranged in a circular array with the center of the core hanging ring mold as the center of the circle; and a pouring gate, which is arranged at the upper center of the core hanging ring mold, and the bottom end is connected to the impeller casting cavity; wherein a plurality of lower mold exhaust holes are evenly distributed on the surface of the lower mold, and a plurality of lower mold exhaust grooves are provided in a circular array on the bottom surface of the lower mold, and the two ends of the lower mold exhaust holes are respectively connected to the impeller casting cavity and the lower mold exhaust groove, thereby improving the mold exhaust effect and improving the casting quality.

[0049] The fan impeller casting mold according to the embodiment of the present application is exemplarily described below with reference to the accompanying drawings.

[0050] See also Figures 1-10 A fan impeller casting mold comprises: an upper casting mold 1 and a lower casting mold 2; wherein a core hanging ring casting mold 3 is provided at the upper center of the upper casting mold 1; wherein an impeller pouring cavity is formed between the upper casting mold 1 and the lower casting mold 2, and a plurality of long and short blade core casting molds 4 are provided in the impeller pouring cavity; wherein the plurality of long and short blade core casting molds 4 are arranged in a circular array with the center of the core hanging ring casting mold 3 as the center; and a pouring gate 5, which is arranged at the upper center of the core hanging ring casting mold 3, and the bottom end is connected with the impeller pouring cavity; wherein a plurality of lower mold exhaust holes 23 are uniformly distributed on the surface of the lower casting mold 2, and a plurality of lower mold exhaust grooves 24 are provided in a circular array on the bottom surface of the lower casting mold 2, and the two ends of the lower mold exhaust holes 23 are respectively connected to the impeller pouring cavity and the lower mold exhaust grooves 24.

[0051] In use, each independent long and short blade core mold 4 is installed in a circular array on the outer wall of the core hanging ring mold 3 with the center of the core hanging ring mold 3 as the center of the circle. After the long and short blade core mold 4 is installed, the core hanging ring mold 3 is lifted and placed above the lower mold 2. The upper mold 1 is moved from above the core hanging ring mold 3 to the lower mold 2, and finally the upper mold 1 and the lower mold 2 are locked and positioned. The upper mold 1, the long and short blade core mold 4, and the lower mold 2 are respectively arranged at intervals to form an impeller casting cavity. The grooves on the surface of the long and short blade core mold 4 form the blades of the impeller 7 after the casting is completed. During the pouring process, metal is injected into the pouring port 5. The molten metal flows downward along the center of the core hanging ring mold 3, and diffuses to the surrounding areas along the surface of the lower mold 2 after meeting the lower mold 2, and finally moves upward through the edge of the lower mold 2 and the groove of the long and short blade core mold 4. Since the graphite mold will produce a large amount of gas when pouring high-temperature molten metal, when the molten metal moves on the surface of the lower mold 2, the gas generated by the graphite mold is exhausted downward through a large number of lower mold exhaust holes 23. The lower mold exhaust groove 24 passes through the lower mold 2 horizontally, so that the gas discharged from the lower mold exhaust hole 23 is discharged from the lower mold exhaust groove 24 from the bottom surface of the lower mold 2 to the outside of the mold, thereby realizing smooth exhaust of the mold and no gas gathering on the bottom surface of the mold.

[0052] It is worth noting that one end of the long and short blade core mold 4 near the pouring gate 5 extends toward the pouring gate 5, and the area surrounded by one end of the long and short blade core mold 4 near the pouring gate 5 forms the hub 8 of the impeller 7 after casting, and the area between the upper mold 1 and the long and short blade core mold 4 forms the front cover plate 9 of the impeller 7 after casting, the grooves on the surface of the long and short blade core mold 4 form the long blades and short blades, and the area between the long and short blade core mold 4 and the lower mold 2 forms the rear cover plate 10 of the impeller 7 after casting.

[0053] See also Figures 1-10 In some embodiments, the long and short blade core mold 4 includes: a short blade mold 41 and a long blade mold 42; wherein the short blade mold 41 includes a first strip body 411, and a first wedge block 412 and a second wedge block 413 are respectively centrally provided on both end surfaces of the first strip body 411; wherein the second wedge block 413 is connected to the lower mold 2, and the first wedge block 412 is connected to the long blade mold 42.

[0054] During use, one end of the short blade mold 41 is clamped and connected to the lower mold 2 through the second wedge block 413, and the other end is clamped and connected to one side of the long blade mold 42, and finally the long blade mold 42 is connected to the core ring mold 3. The short blade mold 41 and the long blade mold 42 are grouped in pairs, and the side of the short blade mold 41 adjacent to the long blade mold 42 is cast to form the short blade 11 of the impeller 7, while the side of the long blade mold 42 away from the short blade mold 41 is cast between the short blade mold 41 of another group of long and short blade core molds 4 to form a long blade, and the formed short blade is located between the two spaced long blades.

[0055] See also Figures 1-10 In some embodiments, the long blade mold 42 includes a second strip body 421, which is spaced apart from one side of the first strip body 411. One end of the second strip body 421 is provided with a third wedge block 422, which is connected to the lower mold 2; the other end of the second strip body 421 is provided with an assembly block 423, and the end of the assembly block 423 away from the second strip body 421 is connected to the core ring mold 3, and the end close to the second strip body 421 is provided with a first wedge groove 424, and the first wedge groove 424 is connected to the second strip body 4 21 are arranged at intervals in the horizontal direction on the end face of the assembly block 423; wherein the assembly blocks 423 are arranged in a circular array at the lower part of the pouring gate 5 to form a diversion cavity 53, and the bottom end of the diversion cavity 53 is connected to the space between the lower casting mold 2 and the long and short blade core casting mold 4; the end face of the assembly block 423 located between the first wedge groove 424 and the second strip plate body 421 is provided with a first short blade groove 414; wherein the gap between the first strip plate body 411 and the second strip plate body 421 forms a second short blade groove 415, and the first short blade groove 414 is connected to the second short blade groove 415 to form a short blade casting groove.

[0056] During use, the long blade mold 42 consists of a second strip body 421 and an assembly block 423. The third wedge block 422 is used to clamp one end of the long blade mold 42 to connect to the lower mold 2, while the assembly block 423 at the other end is clamped and connected to the first wedge block 412 of the short blade mold 41. After the long blade mold 42 and the short blade mold 41 are assembled, the assembly block 423 is connected to the core hanging ring mold 3. One assembly block 423, one short blade mold 41 and one long blade mold 42 form a group of long and short blade core molds 4.

[0057] See also Figures 1-10In some embodiments, a first long blade groove 425 is further provided on the side of the assembly block 423 close to the second strip body 421. A side of the second strip body 421 away from the second short blade groove 415 is adjacent to the first strip body 411 of another set of long and short blade core molds 4. A second long blade groove 426 is formed between the side of the second strip body 421 away from the second short blade groove 415 and the other set of first strip body 411. The first long blade groove 425 is connected to the second long blade groove 426 to form a long blade groove. Blade casting trough; wherein the first long blade casting trough 425 is composed of a first side groove 427 and a second side groove 428, the first side groove 427 and the second side groove 428 form a U-shaped groove, the U-shaped groove opens toward the second long blade casting trough 426, the first side groove 427 is arranged on the side of the assembly block 423 close to the second strip body 421, and the second side groove 428 is arranged on the side of the assembly block 423 close to the first strip body 411; wherein the top and bottom surfaces of the short blade casting trough and the long blade casting trough are both spaced apart from the upper casting mold 1 and the lower casting mold 2.

[0058] During use, the molten metal enters the first long blade groove 425 and the second long blade groove 426, and the long blades 12 of the impeller 7 are formed after the casting is completed. The first long blade groove 425 consists of two parts. The first side groove 427 is located on one side of the assembly block 423, and the second side groove 428 is located on the side of the adjacent other assembly block 423 close to the second strip body 421. The U-shaped groove is composed of the first side groove 427 and the second side groove 428 on the side walls of the two adjacent assembly blocks 423.

[0059] See also Figures 1-10 In some embodiments, the core hanging ring mold 3 includes: a hanging ring body 31, the upper portion of the inner ring of which is connected to the pouring gate 5; a plurality of assembly grooves 32 are arranged in an annular array on the bottom surface of the hanging ring body 31, and an end of the assembly block 423 away from the first strip body 411 and the second strip body 421 is arranged in the assembly groove 32; wherein the end of the assembly block 423 away from the first strip body 411 and the second strip body 421 extends toward the pouring gate 5; a threaded hole 33 is provided on the surface of the hanging ring body 31, and the threaded hole 33 passes through the hanging ring body 31 and the assembly block 423, and the hanging ring body 31 and the assembly block 423 are screw-connected; and A convex ring 34 is provided on the upper outer wall of the lifting ring body 31, and an upper mold riser mold 6 is provided on the outer wall of the lifting ring body 31 and the top of the assembly block 423; the top of the upper mold riser mold 6 is connected to the bottom surface of the convex ring 34; the bottom surface of the upper mold riser mold 6 has a plurality of feeding grooves 61 in a circular array with the center of the lifting ring body 31 as the center, the side walls of the feeding grooves 61 are connected to the outer wall of the assembly block 423, and the bottom ends of the feeding grooves 61 are connected to the upper space of the long and short blade core mold 4; a plurality of upper mold riser exhaust holes 62 are provided on the inner top surface of the feeding grooves 61, and the two ends of the upper mold riser exhaust holes 62 are respectively connected to the feeding grooves 61 and the external space of the upper mold riser mold 6.

[0060] During use, when assembling the long and short blade core molds 4, the threaded holes 33 of the assembly block 423 are aligned with the threaded holes 33 on the surface of the lifting ring body 31, and the assembly block 423 is placed in the assembly groove 32 of the lifting ring body 31. The two threaded holes 33 are connected by bolts to complete the assembly of the assembly block 423 and the lifting ring body 31. The lower surface of the convex ring 34 abuts against the top of the upper mold riser mold 6. When the molten metal is poured, the molten metal undergoes cooling and solidification, which may cause defects such as shrinkage cavities and shrinkage. The shrinkage feeding groove 61 ensures that the casting is full and reduces internal defects by providing additional metal supply liquid. The top of the shrinkage feeding groove 61 is connected to the upper mold riser exhaust hole 62, and the gas generated in the shrinkage feeding groove 61 is discharged through the upper mold riser exhaust hole 62.

[0061] See also Figures 1-10 In some embodiments, the upper mold 1 is an annular plate, and a plurality of upper mold exhaust holes 11 are evenly distributed on the surface of the upper mold 1; the inner ring of the upper mold 1 extends toward the upper mold riser mold 6; the bottom surface of the upper mold riser mold 6 is also provided with an annular groove 12, and the inner ring of the upper mold 1 is arranged in the annular groove 12; the outer ring of the upper mold 1 is connected to the lower mold 2.

[0062] During use, the upper mold 1 is an annular plate, and the inner ring of the annular plate extends toward the upper mold riser mold 6, which can be understood as the inner ring is upwardly tilted. The upper mold 1 is cast below the inner ring to form the mouth ring 13 of the impeller 7. The inner ring is arranged in the annular groove 12 on the bottom surface of the upper mold riser mold 6. The surface of the upper mold 1 is centered on the center of the annular plate, and there are several upper mold exhaust holes 11 in an annular array. The gas formed under the upper mold 1 is discharged from the upper mold exhaust hole 11.

[0063] See also Figures 1-10 In some embodiments, the lower mold 2 includes a bottom plate 21 and an annular side plate 22; the bottom plate 21 is arranged at the bottom end of the annular side plate 22; the lower mold exhaust holes 23 are evenly distributed on the surface of the bottom plate 21, and the lower mold exhaust grooves 24 are arranged in an annular array on the bottom surface of the bottom plate 21; the outer ring of the upper mold 1 is arranged on the inner wall of the top end of the annular side plate 22; the inner wall of the annular side plate 22 has a plurality of second wedge grooves 25 in an annular array with the center of the annular side plate 22 as the center of the circle, and adjacent second wedge blocks 413 and third wedge blocks 422 are arranged in two adjacent second wedge grooves 25.

[0064] During use, the bottom inner ring of the annular side plate 22 is connected to the outer circle of the bottom plate 21, and the top inner ring is used to connect to the outer ring of the upper casting mold 1. The second wedge block 413 and the third wedge block 422 of the long and short blade core casting mold 4 are clamped into the second wedge groove 25 and assembled with the long and short blade core casting mold 4 through the second wedge groove 25.

[0065] See also Figures 1-10In some embodiments, a diverter column 51 is provided at the lower part of the pouring port 5; a plurality of diverter channels 52 are arranged in a ring array on the surface of the diverter column 51, the top of each diverter channel 52 is connected to the pouring port 5, and the lower end is connected to the bottom end of the diverter cavity 53, and the outer wall of the diverter column 51 is connected to the inner wall of the diverter cavity 53; a hollow graphite core 54 is provided at the bottom end of the diverter column 51, and the bottom end of the hollow graphite core 54 is connected to the center of the bottom plate 21.

[0066] The diverter column 51 is disposed in the diverter cavity 53 . The molten metal enters from the pouring port 5 , flows evenly through the diverter cavity 53 to the hollow graphite core 54 , and then moves to the surrounding areas from the hollow graphite core 54 .

[0067] See also Figures 1-10 In some embodiments, the bottom plate 21 extends along the bottom surface of the long and short blade core mold 4, the center of the bottom plate 21 is sunken and provided with a slow flow cavity 26, and the bottom end of the hollow graphite core 54 is connected to the center of the slow flow cavity 26; wherein each diversion channel 52 is vertically projected within the slow flow cavity 26; the upper part of the slow flow cavity 26 is connected to the diversion channel 52, and the side wall is connected to the gap between the long and short blade core mold 4 and the bottom plate 21.

[0068] During use, the slow flow chamber 26 is located at the center of the bottom plate 21. The bottom plate 21 is a horizontal flat plate structure near the outer circle. The bottom plate 21 located below one end of the long and short blade core mold 4 near the core hanging ring mold 3 has the same extension direction as the long and short blade core mold 4. It can be understood that the bottom plate 21 protrudes upward near the slow flow chamber 26, and the slow flow chamber 26 is concave, so that the molten metal first enters the slow flow chamber 26 when flowing downward along the hollow graphite core 54. After the slow flow chamber 26 is filled with molten metal, the molten metal diffuses to the surroundings, ensuring that the molten metal can flow smoothly and be evenly distributed, reducing turbulence when the molten metal enters the cavity, and helping the molten metal to smoothly enter every corner of the cavity, ensuring the integrity and consistency of the casting.

[0069] See also Figures 1-10 In some embodiments, a hollow graphite core exhaust groove 27 is provided on the bottom surface of the bottom plate 21 located at the lower part of the slow flow chamber 26. The bottom surface of the hollow graphite core exhaust groove 27 is open. One end of the hollow graphite core exhaust groove 27 is connected to the inner wall of the hollow graphite core 54, and the other end passes through the bottom plate 21 at the lower part of the outer wall of the slow flow chamber 26.

[0070] During use, the hollow graphite core exhaust groove 27 is located directly below the hollow graphite core 54. When the molten metal moves in the slow flow chamber 26, the hollow graphite core 54 is heated to release gas, and the gas in the hollow graphite core 54 enters the hollow graphite core exhaust groove 27. Since the other end of the hollow graphite core exhaust groove 27 passes through the bottom plate 21 of the outer wall of the slow flow chamber 26, the gas can be discharged horizontally, avoiding the vertically arranged hollow graphite core exhaust groove 27 being blocked by the bottom plate 21.

[0071] While various embodiments of the present application have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0072] The terms used in this document are selected to best explain the principles of the embodiments, practical applications or technical improvements in the market, or to enable other ordinary technicians in this technical field to understand the embodiments disclosed in this document.

[0073] The above are merely optional embodiments of the present application and are not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A fan impeller casting mold, characterized in that: include: Upper casting mold (1), lower casting mold (2); in The upper center of the upper mold (1) is provided with a core ring mold (3); wherein An impeller casting cavity is formed between the upper casting mold (1) and the lower casting mold (2), and a plurality of long and short blade core casting molds (4) are provided in the impeller casting cavity; in A plurality of long and short blade core molds (4) are arranged in a circular array with the center of the core hanging ring mold (3) as the center; and The pouring port (5) is arranged at the center of the upper portion of the core hanging ring casting mold (3), and the bottom end is connected to the impeller pouring cavity; wherein The surface of the lower mold (2) is uniformly distributed with a plurality of lower mold exhaust holes (23), the bottom surface of the lower mold (2) is provided with a plurality of lower mold exhaust grooves (24) in an annular array, and the two ends of the lower mold exhaust holes (23) are respectively connected to the impeller casting cavity and the lower mold exhaust grooves (24).

2. The fan impeller casting mold according to claim 1, characterized in that: The long and short blade core casting mold (4) includes: Short blade casting (41), long blade casting (42); wherein The short blade casting mold (41) comprises a first strip plate body (411), and a first wedge block (412) and a second wedge block (413) are respectively centrally arranged on the end surfaces of both ends of the first strip plate body (411); The second wedge block (413) is connected to the lower casting mold (2), and the first wedge block (412) is connected to the long blade casting mold (42).

3. The fan impeller casting mold according to claim 2, characterized in that: The long blade casting mold (42) includes a second strip plate body (421), the second strip plate body (421) is spaced apart and arranged on one side of the first strip plate body (411), one end of the second strip plate body (421) is provided with a third wedge block (422), and the third wedge block (422) is connected to the lower casting mold (2); wherein The other end of the second strip plate body (421) is provided with an assembly block (423), the end of the assembly block (423) away from the second strip plate body (421) is connected to the core ring casting mold (3), and the end close to the second strip plate body (421) is provided with a first wedge groove (424), and the first wedge groove (424) is arranged at a distance from the second strip plate body (421) in the horizontal direction on the end surface of the assembly block (423); in The assembly blocks (423) are arranged in a circular array at the lower portion of the pouring gate (5) to form a diversion cavity (53), the bottom end of the diversion cavity (53) being connected to the space between the lower casting mold (2) and the long and short blade core casting mold (4); A first short blade groove (414) is formed on the end surface of the assembly block (423) located between the first wedge groove (424) and the second strip plate body (421); The gap between the first strip plate body (411) and the second strip plate body (421) forms a second short blade groove (415), and the first short blade groove (414) is connected to the second short blade groove (415) to form a short blade casting groove.

4. The fan impeller casting mold according to claim 3, characterized in that: A first long blade groove (425) is further provided on a side of the assembly block (423) close to the second strip plate body (421); a side of the second strip plate body (421) away from the second short blade groove (415) is adjacent to the first strip plate body (411) of another set of long and short blade core casting molds (4); a second long blade groove (426) is formed between a side of the second strip plate body (421) away from the second short blade groove (415) and another set of first strip plate bodies (411); the first long blade groove (425) and the second long blade groove (426) are connected to form a long blade casting groove; in The first long blade groove (425) is composed of a first side groove (427) and a second side groove (428). The first side groove (427) and the second side groove (428) form a U-shaped groove, and the U-shaped groove opens toward the second long blade groove (426). The first side groove (427) is provided on a side of the assembly block (423) close to the second strip plate body (421), and the second side groove (428) is provided on a side of the assembly block (423) close to the first strip plate body (411); wherein The top surfaces and bottom surfaces of the short blade casting trough and the long blade casting trough are spaced apart from the upper casting mold (1) and the lower casting mold (2).

5. The fan impeller casting mold according to claim 4, characterized in that: The core ring casting mold (3) includes: A lifting ring body (31), wherein the upper portion of the inner ring of the lifting ring body (31) is connected to the pouring port (5); The bottom surface of the ring body (31) has a plurality of assembly grooves (32) in an annular array, and one end of the assembly block (423) away from the first strip body (411) and the second strip body (421) is arranged in the assembly groove (32); wherein One end of the assembly block (423) away from the first strip plate body (411) and the second strip plate body (421) extends toward the pouring gate (5); A threaded hole (33) is provided on the surface of the lifting ring body (31), the threaded hole (33) passes through the lifting ring body (31) and the assembly block (423), and the lifting ring body (31) and the assembly block (423) are connected by a screw; and The upper outer wall of the lifting ring body (31) is provided with a convex ring (34), and the upper outer wall of the lifting ring body (31) and the assembly block (423) is provided with an upper riser casting mold (6); The top of the upper riser mold (6) is connected to the bottom surface of the convex ring (34); The bottom surface of the upper riser mold (6) has a plurality of shrinkage feeding grooves (61) in a circular array with the center of the ring body (31) as the center of the circle, the side walls of the shrinkage feeding grooves (61) are connected to the outer wall of the assembly block (423), and the bottom ends of the shrinkage feeding grooves (61) are connected to the upper space of the long and short blade core mold (4); A plurality of upper riser exhaust holes (62) are provided on the inner top surface of the feeding groove (61), and both ends of the upper riser exhaust holes (62) are respectively connected to the feeding groove (61) and the external space of the upper riser casting mold (6).

6. The fan impeller casting mold according to claim 5, characterized in that: The upper mold (1) is an annular plate, and a plurality of upper mold exhaust holes (11) are evenly distributed on the surface of the upper mold (1); wherein The inner ring of the upper mold (1) extends toward the upward riser mold (6); The bottom surface of the upper riser mold (6) is further provided with an annular groove (12), and the inner ring of the upper mold (1) is arranged in the annular groove (12); The outer ring of the upper casting mold (1) is connected to the lower casting mold (2).

7. The fan impeller casting mold according to claim 6, characterized in that: The lower casting mold (2) includes a bottom plate (21) and an annular side plate (22); wherein The bottom plate (21) is arranged at the bottom end of the annular side plate (22); The lower exhaust holes (23) are evenly distributed on the surface of the bottom plate (21), and the lower exhaust grooves (24) are annularly arrayed on the bottom surface of the bottom plate (21); The outer ring of the upper casting mold (1) is arranged on the inner wall of the top end of the annular side plate (22); in The inner wall of the annular side plate (22) has a plurality of second wedge grooves (25) in an annular array with the center of the annular side plate (22) as the center of the circle, and adjacent second wedge blocks (413) and third wedge blocks (422) are arranged in two adjacent second wedge grooves (25).

8. The fan impeller casting mold according to claim 7, characterized in that: A diverter column (51) is provided at the lower portion of the pouring port (5); The surface of the diverter column (51) is provided with a plurality of diverter channels (52) in an annular array. The top end of each diverter channel (52) is connected to the pouring port (5), and the bottom end is connected to the bottom end of the diverter cavity (53). The outer wall of the diverter column (51) is connected to the inner wall of the diverter cavity (53). A hollow graphite core (54) is provided at the bottom end of the diverter column (51), and the bottom end of the hollow graphite core (54) is connected to the center of the bottom plate (21).

9. The fan impeller casting mold according to claim 8, characterized in that: The bottom plate (21) extends along the bottom surface of the long and short blade core casting mold (4), the center of the bottom plate (21) is sunken and provided with a slow flow cavity (26), and the bottom end of the hollow graphite core (54) is connected to the center of the slow flow cavity (26); The vertical projection of each diversion channel (52) is located in the slow flow cavity (26); The upper portion of the slow flow cavity (26) is connected to the diversion channel (52), and the side wall is connected to the gap between the long and short blade core casting mold (4) and the bottom plate (21).

10. The fan impeller casting mold according to claim 9, characterized in that: A hollow graphite core exhaust groove (27) is provided on the bottom surface of the bottom plate (21) located at the lower part of the slow flow cavity (26). The bottom surface of the hollow graphite core exhaust groove (27) is open. One end of the hollow graphite core exhaust groove (27) is connected to the inner wall of the hollow graphite core (54), and the other end passes through the bottom plate (21) at the lower part of the outer wall of the slow flow cavity (26).

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