Water pump impeller pouring fired mold structure
By designing a water pump impeller casting investment structure, using the assembly method of straight die head, ring die head and horizontal die head wax mold, the problem of difficulty in setting up the shrinkage channel in the water pump impeller casting is solved, the casting quality and yield rate are improved, and the process difficulty is reduced.
Patent Information
- Application Number
- CN202421947627.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The multi-layer structure of the water pump impeller is complex and has high casting difficulty. It is impossible to set up gates at all independent heat joints for replenishment. The replenishment channel is not easy to set, and the process replenishment is difficult, which is easy to cause shrinkage defects.
A water pump impeller casting investment structure is designed, using a straight die head, annular die head and a horizontal die head wax mold, which is assembled through the wax mold assembly and welding process, and the first blade is used as a retraction channel, reducing the gate demand for the second layer second blade and the lower cover part.
The problem of setting up the retractable channel is solved, the casting quality and yield rate is improved, the difficulty of the casting process is reduced, and the occurrence of shrinkage defects is avoided.
Smart Images
Figure CN222957441U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of impeller casting, in particular to a pouring investment casting structure for a water pump impeller.
Background Art
[0002] Investment casting, also known as lost-wax casting, can produce castings with high dimensional accuracy, high surface finish and complex shapes.
[0003] The water pump impeller is the core component of the water pump and the main factor affecting the working efficiency. Its main function is to convert the mechanical energy of the prime mover into the static pressure energy and dynamic pressure energy of the working fluid. The water pump impeller is usually formed by casting.
[0004] For multi-layer water pump impellers 10 (such as Figure 1 , 2 shown), its structure is extremely complex, the casting difficulty is high, there are many independent hot spot positions, it is impossible to set risers at all independent hot spot positions according to the conventional design idea for feeding, and it is not easy to set the feeding channels, the process feeding difficulty is large, and shrinkage porosity defects are extremely likely to occur.
[0005] In view of the above problems, we need to redesign the pouring investment casting structure of the water pump impeller to improve the casting quality of the water pump impeller. For this, we provide a new technical solution.
Content of the Utility Model
[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a pouring investment casting structure for a water pump impeller, and the technical solution adopted is as follows:
[0007] A pouring investment casting structure for a water pump impeller includes an impeller wax pattern and a pouring mold head wax pattern; the impeller wax pattern includes a first layer of first blade parts, a middle disc part, a second layer of second blade parts, a lower cover part and a middle shaft part, the first layer of first blade parts includes a plurality of first blades, and the second layer of second blade parts includes a plurality of second blades; the pouring mold head wax pattern includes a straight mold head wax pattern, an annular mold head wax pattern and a transverse mold head wax pattern, the annular mold head wax pattern is arranged on the outer periphery of the straight mold head wax pattern, and at least a pair of transverse mold head wax patterns are connected between the straight mold head wax pattern and the annular mold head wax pattern; the straight mold head wax pattern is connected with the middle shaft part, and the bottom of the annular mold head wax pattern is connected with each first blade of the first layer of first blade parts.
[0008] According to an embodiment of the utility model, an ingate wax pattern is connected between the bottom of the annular mold head wax pattern and each first blade of the first layer of first blade parts.
[0009] According to an embodiment of the utility model, a sprue cup wax pattern is integrally formed on the top of the straight mold head wax pattern.
[0010] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, at least a pair of symmetrically arranged wax draining bars are connected between the straight mold head wax mold and the annular mold head wax mold.
[0011] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, a wax draining bar is connected between the straight mold head wax mold and each transverse mold head wax mold.
[0012] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, wax draining bars are connected between both sides of the transverse mold head wax mold and the annular mold head wax mold respectively.
[0013] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, the straight mold head wax mold and the central axis part are assembled together by a wax mold group welding process; the annular mold head wax mold and each first blade are assembled together by a wax mold group welding process.
[0014] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, the end part of the wax draining bar and the straight mold head wax mold, the annular mold head wax mold are assembled together by a wax mold group welding process.
[0015] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, the end part of the wax draining bar and the straight mold head wax mold, the transverse mold head wax mold are assembled together by a wax mold group welding process.
[0016] A pouring investment mold structure for a water pump impeller according to an embodiment of the present invention, the end part of the wax draining bar and the transverse mold head wax mold, the annular mold head wax mold are assembled together by a wax mold group welding process.
[0017] Compared with the prior art, the beneficial effects of the present invention are:
[0018] In the present invention, the straight mold head is connected to the central axis part to fill the cavity of the impeller. In addition, the molten alloy liquid in the straight mold head is shunted to the transverse mold head and then shunted into the annular mold head. The annular mold head is connected to each first blade of the first blade part of one layer to fill the mold. It uses the first blade as a feeding channel and fills the impeller cavity below it. There is no need to set gates in the second blade part of the second layer and the lower cover part for feeding. It not only solves the problem of setting the feeding channel, improves the casting quality and yield, but also reduces the casting process difficulty.
Description of the Drawings
[0019] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:
[0020] Figure 1 Is a three-dimensional schematic diagram of a multi-layer water pump impeller Figure 1 ;
[0021] Figure 2 Is a three-dimensional schematic of a multi-layer water pump impeller Figure 2 ;
[0022] Figure 3 Is a three-dimensional schematic of an embodiment of the present utility model Figure 1 ;
[0023] Figure 4 Is a three-dimensional schematic of an embodiment of the present utility model Figure 2 ;
[0024] Figure 5 Is a structural schematic of an embodiment of the present utility model Figure 1 ;
[0025] Figure 6 Is a structural schematic of an embodiment of the present utility model Figure 2 。
[0026] Description of main component symbols:
[0027] 10. Multi-layer water pump impeller; 20. First blade; 30. Second blade; 40. Middle disc part; 50. Lower cover part; 60. Middle shaft part; 70. Straight mold head wax pattern; 80. Ring mold head wax pattern; 90. Cross mold head wax pattern; 100. Inner gate wax pattern; 110. Gate cup wax pattern; 120. Wax draining strip; 130. Aluminum silicate fiber blanket; 140. Subsidized mold head.
Detailed implementation manners
[0028] The embodiments of the present utility model will be described in detail below. The described embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end.
[0029] The orientation shown in the drawings should not be construed as limiting the specific protection scope of the present utility model. It is only for reference and understanding of the preferred embodiments. The positions of the product components shown in the drawings can be changed, the quantity can be increased, or the structure can be simplified.
[0030] The "connection" described in the specification and the "connection" relationship between the components shown in the drawings can be understood as fixedly connected, detachably connected, or integrally formed connection; it can be directly connected or connected through an intermediate medium. Those of ordinary skill in the art can understand the connection relationship according to the specific situation and can obtain different implementation manners by appropriate means such as screwing, riveting, welding, clamping, or embedding.
[0031] The orientation terms such as upper, lower, left, right, top, bottom, etc. described in the specification and the orientations shown in the attached drawings. Each component can be in direct contact or in contact through other features between them. For example, "above" can be directly above or obliquely above, or it only means higher than other objects. Similar understandings can be made for other orientations.
[0032] The manufacturing materials of the components with solid shapes shown in the specification and the attached drawings can be metal materials, non-metal materials or other composite materials. The machining processes applicable to the components with solid shapes can be stamping, forging, wire cutting, laser cutting, casting, injection molding, numerical milling, 3D printing, machining, etc. Those of ordinary skill in the art can adaptively select or select in combination according to different processing conditions, costs and precisions, but are not limited to the above materials and manufacturing processes.
[0033] The present utility model provides a pouring investment mold structure for a water pump impeller, as Figures 3 to 6 shown, which includes an impeller wax mold and a pouring mold head wax mold. The impeller wax mold includes a first layer of first blade parts, a middle disk part 40, a second layer of second blade parts, a lower cover part 50 and a middle shaft part 60. The first layer of first blade parts includes a plurality of first blades 20, and the second layer of second blade parts includes a plurality of second blades 30. The pouring mold head wax mold includes a straight mold head wax mold 70, an annular mold head wax mold 80 and a transverse mold head wax mold 90. The annular mold head wax mold 80 is arranged on the outer periphery of the straight mold head wax mold 70, and at least a pair of transverse mold head wax molds 90 are connected between the straight mold head wax mold 70 and the annular mold head wax mold 80. The straight mold head wax mold 70 is connected to the middle shaft part 60, and the bottom of the annular mold head wax mold 80 is connected to each first blade 20 of the first layer of first blade parts.
[0034] During casting, first, the impeller wax mold, the straight mold head wax mold 70, the transverse mold head wax mold 90 and the annular mold head wax mold 80 are respectively manufactured. Then, through the wax module welding process, the straight mold head wax mold 70 and the transverse mold head wax mold 90 are assembled together, the transverse mold head wax mold 90 and the annular mold head wax mold 80 are assembled together, the straight mold head wax mold 70 and the middle shaft part 60 of the impeller wax mold are assembled together, and the annular mold head wax mold 80 and each first blade 20 of the first layer of first blade parts are assembled together. In this way, a wax module tree is formed. Then, shell making and dewaxing are carried out to form a shell mold for casting. Then, the shell mold is baked and poured to form a casting steel tree. Finally, the pouring mold head is cut to obtain a cast water pump impeller.
[0035] In the present utility model, the straight die head is connected to the central axis part 60 to fill the cavity of the impeller. In addition, the molten alloy liquid in the straight die head is diverted to the transverse die head and then to the annular die head. The annular die head is connected to each first blade 20 of the first blade part of the first layer to fill the mold. By means of the first blade 20 as a feeding channel, it fills the impeller cavity below it, and there is no need to set gates in the second blade part of the second layer and the lower cover part 50 for feeding, solving the problem of setting independent hot spots. The filling speed is fast, which can prevent defects caused by insufficient casting in the thin-wall positions of the first blade 20 and the second blade 30. It not only solves the problem of setting the feeding channel and the problem of independent hot spots, improving the casting quality and yield, but also reduces the difficulty of the casting process. In addition, before the shell mold is baked, a refractory fiber blanket is stuffed between adjacent first blades 20 for heat preservation, delaying the cooling speed of the first blade 20 and enhancing the feeding capacity with the first blade 20 as the feeding channel. This method is simple to operate, ensuring the operation stability of on-site employees and thus ensuring the quality of the castings.
[0036] Further, in some embodiments of the present utility model application, such as Figures 3 to 6 shown, there is a sprue wax mold 100 connected between the bottom of the annular die head wax mold 80 and each first blade 20 of the first blade part of the first layer. The setting of the sprue facilitates the welding of wax parts, making it convenient to connect the annular die head wax mold 80 and the first blade 20. On the other hand, after casting into a steel tree, it is convenient to cut, preventing the first blade from being damaged during the cutting process and resulting in scrapping.
[0037] Further, in some embodiments of the present utility model application, such as Figures 3 to 6 shown, a pouring cup wax mold 110 is integrally formed on the top of the straight die head wax mold 70.
[0038] Further, in some embodiments of the present utility model application, such as Figures 3 to 6 shown, at least a pair of symmetrically arranged wax draining strips 120 are assembled between the straight die head wax mold 70 and the annular die head wax mold 80 by a wax mold welding process; a wax draining strip 120 is assembled between the straight die head wax mold 70 and each transverse die head wax mold 90 by a wax mold welding process; wax draining strips 120 are assembled between both sides of the transverse die head wax mold 90 and the annular die head wax mold 80 by a wax mold welding process. The setting of the wax draining strips 120 enhances the dewaxing and wax draining ability of the casting shell mold. The wax in the water pump impeller shell mold can be discharged through the wax draining strips 120, preventing the shell mold from cracking due to untimely wax draining. At the same time, it enhances the gas exhaust ability during pouring, improves the filling speed during pouring, and can also pour and form an auxiliary fork mold, further improving the casting quality. In addition, a subsidy die head is provided at the connection part between the straight die head and the wax draining strip 120, which can effectively enhance the feeding ability of the straight die head.
[0039] Although the present utility model has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art from this disclosure that various changes or modifications can be made to the present utility model without departing from the principles and spirit scope defined by the claims. Therefore, the detailed description of the embodiments of this disclosure is only for explanation and not for limiting the present utility model, but the scope of protection is defined by the content of the claims.
Claims
1. A water pump impeller casting investment mold structure, characterized in that: The invention comprises an impeller wax mold and a casting die head wax mold; the impeller wax mold comprises a first blade portion, a middle disk portion (40), two second blade portions, a lower cover portion (50) and a middle shaft portion (60); the first blade portion comprises a plurality of first blades (20), and the second second blade portion comprises a plurality of second blades (30); the casting die head wax mold comprises a straight die head wax mold (70), an annular die head wax mold (80) and a transverse die head wax mold (90); the annular die head wax mold (80) is arranged on the outer periphery of the straight die head wax mold (70), and at least one pair of transverse die head wax molds (90) are connected between the straight die head wax mold (70) and the annular die head wax mold (80); the straight die head wax mold (70) is connected to the middle shaft portion (60), and the bottom of the annular die head wax mold (80) is connected to each first blade (20) of the first blade portion.
2. A water pump impeller casting investment structure according to claim 1, characterized in that: An inner gate wax mold (100) is connected between the bottom of the annular die head wax mold (80) and each first blade (20) of a layer of first blade parts.
3. A water pump impeller casting investment structure according to claim 1, characterized in that: A pouring cup wax mold (110) is integrally formed on the top of the straight die head wax mold (70).
4. A water pump impeller casting investment structure according to claim 1, characterized in that: At least one pair of symmetrically arranged wax strips (120) is connected between the straight die head wax mold (70) and the annular die head wax mold (80).
5. A water pump impeller casting investment structure according to claim 1, characterized in that: A wax strip (120) is connected between the straight die head wax mold (70) and each transverse die head wax mold (90).
6. A water pump impeller casting investment structure according to claim 1, characterized in that: Wax strips (120) are connected between the two sides of the horizontal die head wax mold (90) and the annular die head wax mold (80).
7. A water pump impeller casting investment structure according to claim 1, characterized in that: The straight die head wax mold (70) and the central shaft portion (60) are assembled together through a wax mold welding process; and the annular die head wax mold (80) and each first blade (20) are assembled together through a wax mold welding process.
8. A water pump impeller casting investment structure according to claim 4, characterized in that: The end of the wax strip (120) is assembled with the straight die head wax mold (70) and the annular die head wax mold (80) through a wax mold assembly welding process.
9. A water pump impeller casting investment structure according to claim 5, characterized in that: The end of the wax strip (120) is assembled with the straight die head wax mold (70) and the horizontal die head wax mold (90) through a wax mold assembly welding process.
10. A water pump impeller casting investment structure according to claim 6, characterized in that: The end of the wax strip (120) is assembled with the transverse die head wax mold (90) and the annular die head wax mold (80) through a wax mold assembly welding process.