Ceramic impeller casting mold

Abstract

The utility model relates to the technical field of dies, and provides a ceramic impeller pouring die which comprises a lower die, a core ring, a core die, an upper die and an impeller framework, and the core ring is arranged on the lower die; the core mold is arranged on the lower mold and located in the core ring, and a lower cavity is formed in the core mold; the upper mold is lapped above the core ring and the core mold, the lower end face of the upper mold is provided with an upper cavity, the upper cavity is communicated with the lower cavity to form an impeller cavity for pouring a ceramic material, the upper mold is detachably connected with the lower mold, the upper mold is provided with a sprue gate, and the sprue gate is communicated with the impeller cavity; the impeller framework is arranged on the upper die and located between the upper die and the core die. By means of the technical scheme, the problems that in the related technology, the ceramic impeller is low in forming precision, complex in operation and low in production efficiency in the manufacturing process due to the fact that the machining difficulty of ceramic materials is high are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, and specifically, to a pouring mold for a ceramic impeller. Background Art

[0002] In the field of mechanical manufacturing, due to its excellent high-temperature resistance, corrosion resistance and wear resistance, ceramic materials are gradually widely used in various high-demand working environments. Especially as the core component of pump equipment, the advantages of ceramic impellers are particularly prominent in high-temperature, high-speed and corrosive media environments. However, the processing difficulty of ceramic materials is relatively high, resulting in low forming accuracy, complex operation and low production efficiency during the manufacturing process of ceramic impellers, which has become one of the key factors restricting their large-scale application. Summary of the Utility Model

[0003] The utility model provides a pouring mold for a ceramic impeller, which solves the problems in the related art that the processing difficulty of ceramic materials is relatively high, resulting in low forming accuracy, complex operation and low production efficiency during the manufacturing process of ceramic impellers.

[0004] The technical solution of the utility model is as follows: A pouring mold for a ceramic impeller, characterized in that it includes:

[0005] A lower mold,

[0006] A core ring, the core ring is arranged on the lower mold;

[0007] A core mold, the core mold is arranged on the lower mold and is located inside the core ring, and the core mold has a lower cavity;

[0008] An upper mold, the upper mold is placed above the core ring and the core mold, the lower end surface of the upper mold has an upper cavity, the upper cavity is communicated with the lower cavity to form an impeller cavity for pouring ceramic materials, the upper mold and the lower mold are detachably connected, the upper mold has a pouring port, and the pouring port is communicated with the impeller cavity;

[0009] An impeller skeleton, the impeller skeleton is arranged on the upper mold and is located between the upper mold and the core mold.

[0010] It further includes a sealing plate, the sealing plate is hermetically arranged at the pouring port, and the sealing plate and the pouring port are detachably connected.

[0011] It further includes locking bolts, the lower ends of the locking bolts pass through the sealing plate and are threadedly connected to the upper mold, the number of the locking bolts is multiple, and all the locking bolts are arranged along the circumferential direction of the sealing plate.

[0012] The upper die has mounting holes, the impeller skeleton has screw holes, and further includes a fixing member. The fixing member has a connecting portion and a pressing portion. The connecting portion of the fixing member passes through the mounting holes on the upper die and is threadedly connected to the screw holes on the impeller skeleton. The lower end surface of the pressing portion of the fixing member contacts the upper end surface of the upper die.

[0013] Further includes,

[0014] Connecting seats. A plurality of the connecting seats are arranged circumferentially on the periphery of the upper die and the periphery of the lower die. The connecting seats have positioning holes;

[0015] Fastening bolts. The fastening bolts have screw rods and nuts. The screw rods of the fastening bolts are inserted into the positioning holes on both the upper die and the lower die at the same time;

[0016] Fastening nuts. The fastening nuts are threadedly connected to the fastening bolts. The connecting seat at the uppermost position and the connecting seat at the lowermost position are clamped between the nut of the fastening bolt and the fastening nut.

[0017] The connecting seats are arranged on both the upper periphery and the lower periphery of the lower die.

[0018] The core ring includes,

[0019] Arc-shaped plates. The number of the arc-shaped plates is at least two. All the arc-shaped plates are coaxially arranged with the lower die, and the end faces of adjacent two arc-shaped plates are in contact;

[0020] Connecting plates. The connecting plates are arranged on the outer sides of both ends of the arc-shaped plates. The connecting plates on adjacent two arc-shaped plates are in contact and form a detachable connection.

[0021] Further includes a lower support ring. The lower support ring is arranged on the periphery of the lower die. The upper end surface of the lower support ring has a plurality of lower limit protrusions. All the lower limit protrusions are arranged along the circumferential direction of the lower support ring. After the connecting plates on adjacent two arc-shaped plates are in contact, they are clamped between adjacent two lower limit protrusions.

[0022] Further includes an upper support ring. The upper support ring is arranged on the periphery of the upper die. The lower end surface of the upper support ring has a plurality of upper limit protrusions. All the upper limit protrusions are arranged along the circumferential direction of the upper support ring. After the connecting plates on adjacent two arc-shaped plates are in contact, they are clamped between adjacent two upper limit protrusions.

[0023] The bottom surface of the core mold has a central limiting groove and radial limiting grooves. The number of the radial limiting grooves is multiple, and all the radial limiting grooves are uniformly arranged around the central limiting groove. The inner ends of the radial limiting grooves communicate with the central limiting groove, and the outer end surfaces of the radial limiting grooves are flush with the outer wall of the core mold. The limiting frame is further included. The limiting frame is arranged in the lower mold and has a fixing part and a clamping part. The fixing part is arranged on the inner wall of the lower mold and fits with the outer side wall of the core mold. The clamping part is located below the core mold and is clamped with the radial limiting groove. The inner ends of all the clamping parts are connected together and are located in the central limiting groove.

[0024] The working principle and beneficial effects of the present utility model are as follows: The core ring is arranged on the lower mold; the core mold is arranged on the lower mold and is located inside the core ring. The core mold has a lower cavity; the upper mold is placed on the core ring and the core mold. The lower end surface of the upper mold has an upper cavity, and the upper cavity communicates with the lower cavity to form an impeller cavity for pouring ceramic materials. The upper mold and the lower mold are detachably connected. The upper mold has a pouring port, and the pouring port communicates with the impeller cavity; the impeller skeleton is arranged on the upper mold and is located between the upper mold and the core mold.

[0025] The lower mold is used to carry the core ring and the core mold and cooperate with the upper mold to form a complete impeller cavity. The core ring is arranged on the lower mold to define the outer contour of the core mold. The pouring port is arranged on the upper mold and communicates with the impeller cavity for pouring ceramic materials. The impeller skeleton is used to enhance the structural strength of the impeller. Before assembling the mold, a release agent, such as paraffin, needs to be applied to the mold surface. When assembling the mold, place the upper mold on the lower mold and lock the upper mold and the lower mold. The upper cavity of the upper mold communicates with the lower cavity of the core mold to form a complete impeller cavity. After the mold assembly is completed, place the mold in a heating furnace for heat preservation. After heat preservation for a period of time, place the mold on a vibration platform and fix it. Turn on the vibration platform, adjust the amplitude, and pour the mixed slurry-state ceramic material into the impeller cavity from the pouring port of the upper mold. Along with the vibration, the slurry-state ceramic material gradually fills the impeller cavity in the mold. Through observation at the pouring port, after the ceramic material fills the impeller cavity, block the pouring port, place the whole mold in the heating furnace for curing. After curing for a certain time, disassemble the upper mold and the lower mold and demold to obtain the formed ceramic impeller. This pouring mold can reduce the processing difficulty of ceramic materials, improve the forming accuracy of ceramic impellers in the manufacturing process, is simple and convenient to operate, can improve production efficiency, and can promote the large-scale application of ceramic impellers. Description of the Drawings

[0026] The above characteristics, technical features, advantages and their implementation manners of the present utility model will be further described below in a clear and understandable manner in combination with the drawings in the preferred embodiments.

[0027] Figure 1 This is a schematic diagram of the internal structure of the present utility model.

[0028] Figure 2 This is the front view of the present utility model.

[0029] Figure 3 This is a schematic diagram of the top structure of the present utility model.

[0030] Figure 4 This is a schematic diagram of the bottom structure of the present utility model.

[0031] Figure 5 This is a three-dimensional view of the present utility model in one direction.

[0032] Figure 6 This is a three-dimensional view of the present utility model in another direction.

[0033] In the figure: 1. Lower mold, 2. Core ring, 2-1. Arc-shaped plate, 2-2. Connecting plate, 3. Core mold, 4. Upper mold, 5. Impeller skeleton, 6. Pouring gate, 7. Sealing plate, 8. Locking bolt, 9. Fixing part, 10. Connecting seat, 11. Fastening bolt, 12. Fastening nut, 13. Positioning hole, 14. Lower support ring, 15. Lower limit projection, 16. Upper support ring, 17. Upper limit projection, 18. Central limit groove, 19. Radial limit groove, 20. Limit frame, 20-1. Fixing part, 20-2. Clamping part, 21. Ceramic material. Detailed implementation manners

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the specific implementation manners of the present utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other implementation manners can also be obtained.

[0035] To make the drawings concise, only the parts related to the utility model are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, for some parts with the same structure or function in some drawings, only one of them is schematically shown, or only one of them is marked. In this article, "one" not only means "only this one", but also can mean "more than one" situation, and "several" includes "two" and "more than two".

[0036] In this text, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "linkage" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0038] Example, refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 5 For an embodiment of this utility model, a ceramic impeller casting mold is proposed, which includes a lower mold 1, a core ring 2, a core mold 3, an upper mold 4, an impeller skeleton 5. The core ring 2 is arranged on the lower mold 1; the core mold 3 is arranged on the lower mold 1 and is located inside the core ring 2, and the core mold 3 has a lower cavity; the upper mold 4 is placed above the core ring 2 and the core mold 3, the lower end face of the upper mold 4 has an upper cavity, and the upper cavity communicates with the lower cavity to form an impeller cavity for casting ceramic material 21. The upper mold 4 and the lower mold 1 are detachably connected. The upper mold 4 has a pouring gate 6, and the pouring gate 6 communicates with the impeller cavity; the impeller skeleton 5 is arranged on the upper mold 4 and is located between the upper mold 4 and the core mold 3.

[0039] In this embodiment, the lower mold 1 is used to carry the core ring 2 and the core mold 3, and cooperate with the upper mold 4 to form a complete impeller cavity. The core ring 2 is arranged on the lower mold 1 and is used to define the outer contour of the core mold 3. The pouring gate is arranged on the upper mold 4 and is communicated with the impeller cavity for pouring the ceramic material 21. The impeller skeleton 5 is used to enhance the structural strength of the impeller. Before assembling the mold, a release agent such as paraffin needs to be applied to the mold surface. When assembling the mold, place the upper mold 4 on the lower mold 1 and lock the upper mold 4 and the lower mold 1. The upper cavity of the upper mold 4 is communicated with the lower cavity of the core mold 3 to form a complete impeller cavity. After the mold assembly is completed, place the mold in a heating furnace for heat preservation. After heat preservation for a period of time, place the mold on a vibration platform and fix it. Turn on the vibration platform, adjust the amplitude, and pour the mixed slurry-like ceramic material 21 into the impeller cavity from the pouring gate 6 of the upper mold 4. Along with the vibration, the slurry-like ceramic material 21 gradually fills the impeller cavity in the mold. Through observation at the pouring gate 6, after the ceramic material 21 fills the impeller cavity, block the pouring gate 6, place the whole mold in the heating furnace for curing. After curing for a certain time, disassemble the upper mold 4 and the lower mold 1 and demold to obtain the formed ceramic impeller. This kind of pouring mold can reduce the processing difficulty of the ceramic material 21, improve the forming accuracy of the ceramic impeller in the manufacturing process, is simple and convenient to operate, can improve the production efficiency, and can promote the large-scale application of the ceramic impeller.

[0040] The lower mold 1, the core ring 2, the upper mold 4, and the impeller skeleton 5 are all made of high-temperature-resistant and high-strength aluminum alloy ZL104 material, which has good thermal strength and thermal stability, can improve the service life, and has good mechanical properties within the use temperature range, enabling the ceramic material to be formed in the mold by pouring, which can greatly improve the production efficiency and ensure the accuracy and performance of the product at the same time. The structure is simple and the operation is convenient, which can reduce the manufacturing cost of the ceramic impeller, is suitable for large-scale production, especially for the production of various ceramic material impellers with a diameter of less than 750 mm, such as silicon carbide composite ceramics, silicon nitride composite ceramics, zirconia composite ceramics, etc. By optimizing the parting surface design, the forming accuracy of the ceramic impeller can be improved. It can maintain stable performance during long-term use, and can significantly improve the forming accuracy and finished product rate of the ceramic impeller. It can realize the rapid, high-precision, and high-performance forming of the ceramic impeller, and can meet the market demand for high-performance ceramic impellers. The successful application of this technology will not only promote the application of ceramic materials in more fields, but also make important contributions to the technological progress and industrial upgrading of the machinery manufacturing industry.

[0041] Further, as Figure 2 and Figure 5As shown, it further includes a sealing plate 7, which is sealingly arranged at the pouring port. The sealing plate 7 is detachably connected to the pouring port 6. After pouring is completed, the sealing plate 7 is installed at the pouring port 6 and locked with the pouring port 6, then the pouring port 6 can be sealed, which is convenient for putting the whole mold into the heating furnace. Before the next pouring, the sealing plate 7 can be detached from the pouring port 6. The structure is simple and easy to use. The sealing plate 7 is also made of high-temperature resistant and high-strength aluminum alloy ZL104 material, which has good thermal strength and thermal stability and can improve the service life.

[0042] Furthermore, as Figure 5 shown, it further includes locking bolts 8. The lower end of the locking bolt 8 passes through the sealing plate 7 and is threadedly connected to the upper mold 4. The number of locking bolts 8 is multiple, and all the locking bolts 8 are arranged along the circumferential direction of the sealing plate 7. The sealing plate 7 is sealingly arranged at the pouring port 6. The upper end face of the pouring port 6 has a threaded hole, and the sealing plate 7 has a through hole. The lower end of the locking bolt 8 passes through the through hole on the sealing plate 7 and is threadedly connected to the threaded hole on the upper mold 4. By locking the multiple locking bolts 8 with the upper mold 4 together, the sealing performance of the mold during the heating process in the heating furnace can be ensured. The connection is firm and reliable, and the disassembly and assembly are convenient, fast, time-saving and labor-saving.

[0043] Furthermore, as Figure 1 、 Figure 2 、 Figure 3 and Figure 5 shown, the upper mold 4 has mounting holes, and the impeller skeleton 5 has threaded holes. It further includes a fixing member 9. The fixing member 9 has a connecting portion and a pressing portion. The connecting portion of the fixing member 9 passes through the mounting hole on the upper mold 4 and is threadedly connected to the threaded hole on the impeller skeleton 5. The lower end face of the pressing portion of the fixing member 9 contacts the upper end face of the upper mold 4. By using the fixing member 9 to lock the upper mold 4 and the impeller skeleton 5 together, the stability of the impeller skeleton 5 can be ensured. Moreover, the structure is simple, the connection is firm and reliable, the disassembly and assembly are convenient, fast, time-saving and labor-saving. The fixing member 9 is also made of high-temperature resistant and high-strength aluminum alloy ZL104 material, which has good thermal strength and thermal stability and can improve the service life.

[0044] Furthermore, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown in the figure, it further includes a connecting seat 10, a fastening bolt 11, and a fastening nut 12. A plurality of connecting seats 10 are arranged circumferentially around the upper die 4 and the lower die 1. The connecting seat 10 has a positioning hole 13; the fastening bolt 11 has a screw rod and a nut. The screw rod of the fastening bolt 11 is inserted into the positioning holes 13 on both the upper die 4 and the lower die 1 at the same time; the fastening nut 12 is threadedly connected to the fastening bolt 11. The connecting seat 10 at the uppermost position and the connecting seat 10 at the lowermost position are clamped between the nut of the fastening bolt 11 and the fastening nut 12. The connecting seats 10 on the upper die 4 and the connecting seats 10 on the lower die 1 are symmetrically arranged up and down. Through the cooperation of a plurality of fastening nuts 12 and a plurality of fastening bolts 11, the upper die 4 and the lower die 1 are locked together. The structure is simple, the connection is firm and reliable, and it is convenient for disassembly and assembly.

[0045] Further, as Figure 1 , Figure 2 , Figure 5 and Figure 6 shown, connecting seats 10 are arranged on both the outer periphery of the upper end and the outer periphery of the lower end of the lower die 1. The screw rod of the fastening bolt 11 passes through the positioning holes 13 on the upper and lower layers of connecting seats 10 at the same time, which can increase the contact area between the fastening bolt 11 and the lower die 1, and the connection is more firm and reliable.

[0046] Further, as Figure 5 and Figure 6 shown, the core ring 2 includes an arc-shaped plate 2-1 and a connecting plate 2-2. The number of arc-shaped plates 2-1 is at least two. All the arc-shaped plates 2-1 are coaxially arranged with the lower die 1, and the end faces of adjacent arc-shaped plates 2-1 are in contact; connecting plates 2-2 are arranged on the outer sides of both ends of the arc-shaped plate 2-1. The connecting plates 2-2 on adjacent arc-shaped plates 2-1 are in contact and form a detachable connection. The number of arc-shaped plates 2-1 is preferably two. After the open ends of the two arc-shaped plates 2-1 are spliced together, the two connecting plates 2-2 at the same end of the two arc-shaped plates 2-1 are also in contact. Just lock the two connecting plates 2-2 together, which is convenient for disassembly and assembly.

[0047] Further, as Figure 5 and Figure 6As shown, it further includes a lower support ring 14. The lower support ring 14 is arranged outside the lower mold 1. The upper end face of the lower support ring 14 has a plurality of lower limit protrusions 15. All the lower limit protrusions 15 are arranged along the circumferential direction of the lower support ring 14. After the connecting plates 2-2 on two adjacent arc-shaped plates 2-1 are fitted together, they are clamped between two adjacent lower limit protrusions 15. After the connecting plates 2-2 on two arc-shaped plates 2-1 are fitted together, they are clamped between two adjacent lower limit protrusions 15. The two lower limit protrusions 15 can limit the lower ends of the two connecting plates 2-2, thereby limiting the lower end of the core ring 2 and preventing the core ring 2 from shifting circumferentially between the lower mold 1 and the lower mold 1.

[0048] Further, as Figure 5 and Figure 6 shown, it further includes an upper support ring 16. The upper support ring 16 is arranged outside the upper mold 4. The lower end face of the upper support ring 16 has a plurality of upper limit protrusions 17. All the upper limit protrusions 17 are arranged along the circumferential direction of the upper support ring 16. After the connecting plates 2-2 on two adjacent arc-shaped plates 2-1 are fitted together, they are clamped between two adjacent upper limit protrusions 17. After the connecting plates 2-2 on two arc-shaped plates 2-1 are fitted together, they are clamped between two adjacent upper limit protrusions 17. The two upper limit protrusions 17 can limit the upper ends of the two connecting plates 2-2, thereby limiting the upper end of the core ring 2 and preventing the core ring 2 from shifting circumferentially between the upper mold 4 and the upper mold 4.

[0049] Further, as Figure 4 and Figure 6 shown, the bottom surface of the core mold 3 has a central limit groove 18 and radial limit grooves 19. The number of the radial limit grooves 19 is multiple. All the radial limit grooves 19 are evenly arranged around the central limit groove 18. The inner end of the radial limit groove 19 is communicated with the central limit groove 18. The outer end face of the radial limit groove 19 is flush with the outer wall of the core mold 3. It further includes a limit frame 20. The limit frame 20 is arranged inside the lower mold 1. The limit frame 20 has a fixing part 20-1 and a clamping part 20-2. The fixing part 20-1 is arranged on the inner wall of the lower mold 1 and is attached to the outer side wall of the core mold 3. The clamping part 20-2 is located below the core mold 3 and is clamped with the radial limit groove 19. The inner ends of all the clamping parts 20-2 are connected together and are located inside the central limit groove 18. Taking the limit frame 20 having five fixing parts 20-1 as an example, each fixing part 20-1 has a clamping part 20-2. Correspondingly, the bottom surface of the core mold 3 has a central limit groove 18 and five radial limit grooves 19. The five radial limit grooves 19 are evenly arranged along the circumferential direction of the core mold 3. The five fixing parts 20-1 are evenly arranged outside the core mold 3. The five clamping parts 20-2 are respectively clamped with the five radial limit grooves 19, which can effectively prevent the core mold 3 from shifting circumferentially between the lower mold 1 and the lower mold 1.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. A ceramic impeller casting mold, characterized in that: including lower die (1) core ring (2), the core ring (2) is arranged on the lower die (1); core mold (3), the core mold (3) is arranged on the lower die (1) and is located inside the core ring (2), and the core mold (3) has a lower cavity; upper die (4), the upper die (4) is placed above the core ring (2) and the core mold (3), the lower end face of the upper die (4) has an upper cavity, and the upper cavity communicates with the lower cavity to form an impeller cavity for pouring ceramic material (21). The upper die (4) and the lower die (1) are detachably connected. The upper die (4) has a pouring port (6), and the pouring port (6) communicates with the impeller cavity; impeller skeleton (5), the impeller skeleton (5) is arranged on the upper die (4) and is located between the upper die (4) and the core mold (3).

2. The ceramic impeller casting mold according to claim 1, characterized in that: It further includes a sealing plate (7), the sealing plate (7) is hermetically arranged at the pouring port (6), and the sealing plate (7) and the pouring port (6) are detachably connected.

3. The ceramic impeller casting mold according to claim 2, wherein: It further includes locking bolts (8), the lower ends of the locking bolts (8) pass through the sealing plate (7) and are threadedly connected to the upper die (4). The number of the locking bolts (8) is multiple, and all the locking bolts (8) are arranged along the circumferential direction of the sealing plate (7).

4. A ceramic impeller casting mold according to claim 1, characterized in that: The upper die (4) has mounting holes, and the impeller skeleton (5) has threaded holes. It further includes a fixing member (9), the fixing member (9) has a connecting portion and a pressing portion. The connecting portion of the fixing member (9) passes through the mounting holes on the upper die (4) and is threadedly connected to the threaded holes on the impeller skeleton (5), and the lower end face of the pressing portion of the fixing member (9) contacts the upper end face of the upper die (4).

5. A ceramic impeller casting mold according to claim 1, characterized in that: including also connecting seats (10), a plurality of the connecting seats (10) are arranged along the circumferential direction on the periphery of the upper die (4) and the periphery of the lower die (1), and the connecting seats (10) have positioning holes (13); fastening bolts (11), the fastening bolts (11) have screw rods and nuts. The screw rods of the fastening bolts (11) are inserted into the positioning holes (13) on both the upper die (4) and the lower die (1) at the same time; fastening nuts (12), the fastening nuts (12) are threadedly connected to the fastening bolts (11), and the uppermost connecting seat (10) and the lowermost connecting seat (10) are clamped between the nut of the fastening bolt (11) and the fastening nut (12).

6. The ceramic impeller casting mold according to claim 5, characterized in that: The connecting seats (10) are arranged on both the upper periphery and the lower periphery of the upper end of the lower die (1).

7. A ceramic impeller casting mold according to claim 1, characterized in that: The core ring (2) includes arc-shaped plates (2-1), the number of the arc-shaped plates (2-1) is at least two, all the arc-shaped plates (2-1) are coaxially arranged with the lower die (1), and the end faces of two adjacent arc-shaped plates (2-1) are in contact; Connecting plate (2-2), the connecting plate (2-2) is provided on the outer sides of both ends of the arc-shaped plate (2-1), and the connecting plates (2-2) on adjacent two arc-shaped plates (2-1) are in contact and form a detachable connection.

8. A ceramic impeller casting mold according to claim 7, characterized in that: It further includes a lower support ring (14), the lower support ring (14) is arranged on the periphery of the lower mold (1), the upper end surface of the lower support ring (14) has a plurality of lower limit protrusions (15), all the lower limit protrusions (15) are arranged along the circumferential direction of the lower support ring (14), and the connecting plates (2-2) on adjacent two arc-shaped plates (2-1) are clamped between adjacent two lower limit protrusions (15) after being in contact.

9. The ceramic impeller casting mold according to claim 7, characterized in that: It further includes an upper support ring (16), the upper support ring (16) is arranged on the periphery of the upper mold (4), the lower end surface of the upper support ring (16) has a plurality of upper limit protrusions (17), all the upper limit protrusions (17) are arranged along the circumferential direction of the upper support ring (16), and the connecting plates (2-2) on adjacent two arc-shaped plates (2-1) are clamped between adjacent two upper limit protrusions (17) after being in contact.

10. A ceramic impeller casting mold according to claim 1, characterized in that: The bottom surface of the core mold (3) has a central limit groove (18) and radial limit grooves (19), the number of the radial limit grooves (19) is multiple, all the radial limit grooves (19) are evenly arranged around the central limit groove (18), the inner end of the radial limit groove (19) is communicated with the central limit groove (18), the outer end surface of the radial limit groove (19) is flush with the outer wall of the core mold (3), it further includes a limit frame (20), the limit frame (20) is arranged in the lower mold (1), the limit frame (20) has a fixing part (20-1) and a clamping part (20-2), the fixing part (20-1) is arranged on the inner wall of the lower mold (1) and is in contact with the outer side wall of the core mold (3), the clamping part (20-2) is located below the core mold (3) and is clamped with the radial limit groove (19), the inner ends of all the clamping parts (20-2) are connected together and are located in the central limit groove (18).

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