A mold for sand casting of a large centrifugal pump body

Abstract

This utility model provides a sand casting mold for a large centrifugal pump body. The centrifugal pump body casting mold includes an upper outer mold, a lower outer mold, a pump foot core box, an upper and lower core box for the bearing frame, an upper and lower core box for the shaft hole, a lower and upper core box for the suction channel, and an upper and lower core box for the suction channel. This utility model relates to the field of casting mold technology. The upper and lower core boxes for the bearing frame, the upper and lower core boxes for the suction channel, and the lower and upper core boxes for the suction channel, as well as the core box for the discharge channel, are all equipped with hidden risers for feeding the open face. After the mold is closed, a top-down feeding system for the open face is formed, which avoids defects such as shrinkage cavities and porosity on the open face of the casting, improves the internal quality of the product, and increases the pass rate of the hydrostatic test.

Description

Technical Field

[0001] This utility model relates to the field of casting mold technology, and in particular to a mold for sand casting of a large centrifugal pump body. Background Technology

[0002] A centrifugal pump's function is to draw in fluid, compress it, and discharge it. When the impeller inside the pump body rotates, its curved surface draws in the fluid, compresses it as the impeller rotates, and finally discharges the compressed fluid through the pump outlet. The pump body is designed to maximize pump efficiency, reduce energy consumption, and also provides support and stability.

[0003] In recent years, pump body design has been increasingly moving towards larger size and lighter weight. The pump body outline dimensions have become larger, the wall thickness has become thinner, the dimensional accuracy requirements of hydraulic parts are high, the non-destructive testing standards have been greatly improved compared to the past, and the water pressure test pressure is high. Therefore, the casting process of the pump body has become significantly more difficult.

[0004] Currently, pump body products manufactured using molds made according to traditional sand casting methods often fail to simultaneously meet the requirements for dimensional accuracy, non-destructive testing, and hydrostatic testing. Utility Model Content

[0005] The purpose of this utility model is to provide a mold for sand casting of large centrifugal pump bodies. This mold can solve the problem that pump body products made by molds made according to traditional sand casting methods are difficult to meet the requirements of dimensional accuracy, non-destructive testing, and water pressure testing at the same time.

[0006] This utility model provides a sand casting mold for a large centrifugal pump body. The centrifugal pump body casting mold includes an upper outer mold, a lower outer mold, a pump foot core box, an upper and lower tile frame core box, an upper and lower shaft hole core box, a lower and upper suction channel core box, and an upper and lower discharge channel core box. The upper outer mold, lower outer mold, pump foot core box, upper and lower tile frame core box, upper and lower shaft hole core box, lower and upper suction channel core box, and upper and lower discharge channel core box, when combined, form a casting mold for casting a complete centrifugal pump body.

[0007] Preferably, the outer mold upper part includes an upper mold base plate, an upper mold sample, an upper mold suction channel inlet core head, an upper mold positioning circular concave platform, a tile frame movable block, an upper mold center-opening side core head, and an upper mold discharge channel outlet core head; the upper mold sample is fixedly mounted on the upper mold base plate, the upper mold center-opening side core head is fixedly mounted on the upper mold base plate, the upper mold suction channel inlet core head is fixedly mounted on the upper mold base plate in a trapezoidal structure, the upper mold discharge channel outlet core head is fixedly mounted on the upper mold base plate, the upper mold positioning circular concave platform is fixedly mounted on the upper mold base plate, and the tile frame movable block is movably connected to the upper mold base plate.

[0008] Preferably, the lower outer mold includes a lower mold base plate, a lower mold sample, a lower mold ejector outlet core head, a lower mold pump foot rib plate, a lower mold pump foot core head, a lower mold ejector outlet core head, a lower mold positioning round boss, and a lower mold center-opening side core head; the lower mold sample is fixedly mounted on the lower mold base plate, the lower mold ejector outlet core head is fixedly mounted on the lower mold base plate, the lower mold pump foot core head is fixedly mounted on the lower mold base plate, the lower mold pump foot rib plate is movably connected to the lower mold base plate, the lower mold ejector outlet core head is fixedly mounted on the lower mold base plate, the lower mold positioning round boss is fixedly mounted on the lower mold base plate, and the lower mold center-opening side core head is fixedly mounted on the lower mold base plate.

[0009] Preferably, the tile frame core box is further provided with an upper concealed riser, and the tile frame core box is further provided with a lower concealed riser.

[0010] Preferably, the pump foot core box has a split structure.

[0011] Preferably, the suction channel core box is further provided with a lower suction inlet core head, a lower center-opening core head, and a lower concealed riser, and the length of the lower center-opening core head is 400mm.

[0012] Preferably, the suction channel core box is further fixedly provided with a suction inlet core head, a concealed riser on the suction channel core box, and a center-opening side core head on the suction channel core box, the length of which is 400mm.

[0013] Preferably, the discharge channel core box is further provided with discharge channel core box sand tamping holes, discharge channel core box ribs, discharge channel core box outlet core head, discharge channel core box concealed riser and discharge channel core box open side core head respectively. The length of the discharge channel core box open side core head is 400mm and the number of discharge channel core box sand tamping holes is seven.

[0014] Preferably, the upper hidden riser of the suction channel core box, the lower hidden riser of the suction channel core box, the lower hidden riser of the discharge channel core box, the upper hidden riser of the tile frame core box, and the lower hidden riser of the tile frame core box, after the box is closed, form an integral hidden riser from top to bottom, thus forming a complete side shrinkage channel.

[0015] This utility model provides an improved sand casting mold for a large centrifugal pump body. Compared with the prior art, it has the following improvements and advantages: The mold is equipped with hidden risers for feeding the open face of the core box, the bottom of the core box, the top of the suction channel core box, the bottom of the suction channel core box, and the inside of the discharge channel core box. After the mold is closed, a top-to-bottom feeding system is formed, which avoids defects such as shrinkage cavities and porosity on the open face of the casting, improves the internal quality of the product, and increases the pass rate of the hydrostatic test. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the isometric structure of the outer mold of this utility model.

[0018] Figure 2 This is a schematic diagram of the isometric structure of the lower outer mold of this utility model.

[0019] Figure 3 This is an isometric structural diagram of the pump foot core box of this utility model.

[0020] Figure 4 This is an isometric structural diagram of the tile frame core box of this utility model.

[0021] Figure 5 This is a schematic diagram of the isometric structure under the core box of the tile frame of this utility model.

[0022] Figure 6 This is a schematic diagram of the isometric structure on the shaft hole core box of this utility model.

[0023] Figure 7 This is a schematic diagram of the isometric structure under the shaft hole core box of this utility model.

[0024] Figure 8 This is an isometric structural diagram of the inhalation flow channel core box of this utility model.

[0025] Figure 9 This is an isometric structural diagram of the inhalation flow channel core box of this utility model; Figure 10 This is an isometric structural diagram of the ejector core box of this utility model.

[0026] Explanation of reference numerals in the attached figures: 1. Upper mold base plate; 2. Upper mold sample; 3. Upper mold suction channel inlet core head; 4. Upper mold positioning round concave platform; 5. Brick frame movable block; 6. Upper mold center-opening side core head; 7. Upper mold riser; 8. Upper mold discharge channel outlet core head; 9. Outer mold upper mold; 10. Lower mold discharge channel core head; 11. Lower mold base plate; 12. Lower mold sample; 13. Lower mold pump foot rib plate; 14. Lower mold pump foot core head; 15. Lower mold discharge channel core head; 16. Lower mold positioning round boss; 17. Lower mold center-opening side core head; 18. Lower outer mold; 19. Pump foot core box; 20. Upper part of the bearing frame core box; 21. Upper concealed riser of the bearing frame core box; 22. Lower part of the bearing frame core box; 23. Lower concealed riser of the bearing frame core box; 24. Upper part of the shaft hole core box; 25. Lower part of the shaft hole core box; 26. Lower suction inlet core head of the suction channel core box; 27. Lower part of the suction channel core box; 28. Lower part of the suction channel core box. 29. Lower hidden riser of suction flow channel core box; 30. Upper inlet core head of suction flow channel core box; 31. Upper suction flow channel core box; 32. Upper hidden riser of suction flow channel core box; 33. Upper center-opening side core head of suction flow channel core box; 34. Sanding hole of discharge flow channel core box; 35. Rib plate of discharge flow channel core box; 36. Outlet core head of discharge flow channel core box; 37. Discharge flow channel core box; 38. Hidden riser of discharge flow channel core box; 39. Center-opening side core head of discharge flow channel core box. Detailed Implementation

[0027] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figure 1-10 This utility model provides a technical solution: a sand casting mold for a large centrifugal pump body. The centrifugal pump body casting mold includes an upper outer mold 9, a lower outer mold 18, a pump foot core box 19, an upper tile frame core box 20, a lower tile frame core box 22, an upper shaft hole core box 24, a lower shaft hole core box 25, a lower suction channel core box 27, an upper suction channel core box 31, and a lower discharge channel core box 37. The upper outer mold 9, the lower outer mold 18, the pump foot core box 19, the upper tile frame core box 20, the lower tile frame core box 22, the upper shaft hole core box 24, the lower shaft hole core box 25, the lower suction channel core box 27, the upper suction channel core box 31, and the lower discharge channel core box 37, when combined, form a casting mold for casting a complete centrifugal pump body. The upper shaft hole core box 24 and the lower shaft hole core box 25 are of the split type.

[0031] Specifically, the outer mold upper part 9 includes an upper part shaping base plate 1, an upper part sample 2, an upper part suction flow channel inlet core head 3, an upper part positioning round concave platform 4, a tile frame movable block 5, an upper part center open side core head 6, an upper part riser 7, and an upper part discharge flow channel outlet core head 8; The upper mold sample 2 is fixedly set on the upper mold base plate 1. The upper mold center-opening side core head 6 is fixedly set on the upper mold base plate 1 with a trapezoidal structure with a length of 400mm. The upper mold suction channel inlet core head 3 is fixedly set on the upper mold base plate 1 with a trapezoidal structure. The upper mold discharge channel outlet core head 8 is fixedly set on the upper mold base plate 1 with a composite shape of rectangle and circle. The upper mold riser 7 is fixedly set on the upper mold base plate 1. The upper mold positioning circular concave platform 4 is fixedly set on the mold base plate. The tile frame movable block 5 is movably connected to the upper mold base plate 1. The tile frame movable block 5 is made of aluminum alloy.

[0032] Specifically, the outer mold lower mold 18 includes a lower mold base plate 11, a lower mold sample 12, a lower mold ejector outlet core head 10, a lower mold pump foot rib plate 13, a lower mold pump foot core head 14, a lower mold ejector outlet core head 15, a lower mold positioning round boss 16, and a lower mold center-opening side core head 17. The lower mold sample 12 is fixedly mounted on the lower mold base plate 11. The lower mold discharge outlet core head 10 is fixedly mounted on the lower mold base plate 11 in a composite shape of rectangle and circle. The lower mold pump foot core head 14 is fixedly mounted on the lower mold base plate 11 in a trapezoidal structure. The lower mold pump foot rib plate 13 is movably connected to the lower mold base plate 11. The lower mold pump foot rib plate 13 is made of aluminum alloy. The lower mold discharge outlet core head 15 is fixedly mounted on the lower mold base plate 11 in a trapezoidal structure. The lower mold positioning round bosses 16 are fixedly mounted on the lower mold base plate 11. The lower mold center-opening side core head 17 is fixedly mounted on the lower mold base plate 11 in a trapezoidal structure with a length of 400mm.

[0033] There are three lower positioning round bosses 16 and three upper positioning round concave tables 4. These mutually positioning lower positioning round bosses 16 and upper positioning round concave tables 4 allow the upper outer mold 9 and lower outer mold 18 to perform molding operations simultaneously, improving molding production efficiency. The mutually positioning lower positioning round bosses 16 and upper positioning round concave tables 4 also improve the accuracy of mold assembly. Specifically, the upper part of the tile frame core box 20 is also provided with a concealed riser, and the lower part of the tile frame core box 22 is also provided with a concealed riser.

[0034] Specifically, the pump foot core box 19 has a split structure.

[0035] Specifically, the lower part 27 of the suction channel core box is also fixedly provided with a lower suction port core head 26, a lower center opening side core head 28, and a lower concealed riser 29. The length of the lower center opening side core head 28 is 400mm.

[0036] Specifically, the suction channel core box 31 is also fixedly provided with a suction inlet core head 30, a hidden riser 32, and a center-opening side core head 33, the length of which is 400mm.

[0037] Specifically, the ejector core box 37 is also fixedly provided with ejector core box 37 sand tamping hole 34, ejector core box rib plate 35, ejector core box outlet core head 36, ejector core box concealed riser 38, and ejector core box center-opening side core head 39. The length of ejector core box center-opening side core head 39 is 400mm. The number of ejector core box 37 sand tamping hole 34 is seven. The ejector core box rib plate 35 is made of aluminum alloy.

[0038] The length of the core head 33 on the upper center-open side of the suction flow channel core box 31, the core head 28 on the lower center-open side of the suction flow channel core box 27, and the core head 39 on the center-open side of the discharge flow channel core box 37 are all 400mm. The shape of the core head is consistent with the shape of the upper center-open side core head 6 in the upper mold 9 and the lower center-open side core head 17 in the lower mold 18. The shape is trapezoidal, with a gap of 1mm on one side, which increases the contact area between the sand core and the outer mold core head. The sand core is accurately positioned and stable when the box is closed.

[0039] Specifically, after the boxes are closed, the hidden riser 32 on the suction flow channel core box 31, the hidden riser 29 on the suction flow channel core box 27, the hidden riser 38 on the discharge flow channel core box 37, the hidden riser 21 on the tile frame core box 20, and the hidden riser 23 on the tile frame core box 22 form an integral hidden riser from top to bottom, thus forming a complete side shrinkage channel.

[0040] Working principle: Step 1: Select a suitable sand box and place it on the upper outer mold 9 and the lower outer mold 18 to obtain the upper and lower outer shapes of the sand mold.

[0041] Step 2: Using the pump foot core box 19, the upper core box of the bearing frame 20, the lower core box of the bearing frame 22, the upper core box of the shaft hole 24, the lower core box of the shaft hole 25, the lower core box of the suction flow channel 27, the upper core box of the suction flow channel 31, and the discharge flow channel core box 37, the core making operation is carried out to obtain the required sand core.

[0042] Step 3: Apply coating to the upper and lower shapes and the sand core.

[0043] Step 4: Assemble the prepared sand cores into the lower outer shape according to the core head positioning method.

[0044] Step 5: Position the upper outer mold according to the three upper positioning concave platforms 4 and the lower positioning convex platforms 16, and close the upper outer mold to form a complete casting cavity.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mold for sand casting of a large centrifugal pump body, characterized in that, The centrifugal pump body casting mold includes an upper outer mold (9), a lower outer mold (18), a pump foot core box (19), an upper (20) and a lower (22) core box for the bearing frame, an upper (24) and a lower (25) core box for the shaft hole, a lower (27) core box for the suction channel, an upper (31) core box for the suction channel, and a core box for the discharge channel. The upper outer mold (9), the lower outer mold (18), the pump foot core box (19), the upper (20) and the lower (22) core box for the bearing frame, the upper (24) and the lower (25) core box for the shaft hole, the lower (27) core box for the suction channel, the upper (31) core box for the suction channel, and the core box for the discharge channel are combined to form a casting mold for casting a complete centrifugal pump body.

2. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The outer mold upper part (9) includes an upper mold base plate (1), an upper mold sample (2), an upper mold suction channel inlet core head (3), an upper mold positioning round concave platform (4), a tile frame movable block (5), an upper mold center-opening side core head (6), and an upper mold discharge channel outlet core head (8); the upper mold sample (2) is fixedly set on the upper mold base plate (1), the upper mold center-opening side core head (6) is fixedly set on the upper mold base plate (1), the upper mold suction channel inlet core head (3) is fixedly set on the upper mold base plate (1) in a trapezoidal structure, the upper mold discharge channel outlet core head (8) is fixedly set on the upper mold base plate (1), the upper mold positioning round concave platform (4) is fixedly set on the upper mold base plate (1), and the tile frame movable block (5) is movably connected to the upper mold base plate (1).

3. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The lower outer mold (18) includes a lower mold base plate (11), a lower mold sample (12), a lower mold ejector outlet core head (10), a lower mold pump foot rib plate (13), a lower mold pump foot core head (14), a lower mold ejector outlet core head (15), a lower mold positioning round boss (16), and a lower mold center-opening side core head (17); the lower mold sample (12) is fixedly set on the lower mold base plate (11), the lower mold ejector outlet core head (10) is fixedly set on the lower mold base plate (11), and the lower mold pump foot core head (17) is fixedly set on the lower mold base plate (11). 14) Fixedly installed on the lower molding base plate (11), the lower molding pump foot rib plate (13) is movably connected to the lower molding base plate (11), the lower molding discharge channel core head (15) is fixedly installed on the lower molding base plate (11), the lower molding positioning round boss (16) is fixedly installed on the lower molding base plate (11), and the lower molding center-opening side core head (17) is fixedly installed on the lower molding base plate (11).

4. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The upper (20) of the tile frame core box is also provided with an upper hidden riser (21), and the lower (22) of the tile frame core box is also provided with a lower hidden riser (23).

5. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The pump foot core box (19) has a split structure.

6. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The lower part (27) of the suction channel core box is also fixedly provided with a lower suction port core head (26), a lower center opening side core head (28) of the suction channel core box, and a lower dark riser (29) of the suction channel core box. The length of the lower center opening side core head (28) of the suction channel core box is 400mm.

7. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The suction channel core box (31) is also fixedly provided with a suction inlet core head (30), a hidden riser (32) on the suction channel core box, and a center-opening side core head (33) on the suction channel core box. The length of the center-opening side core head (33) on the suction channel core box is 400mm.

8. A mold for sand casting a large centrifugal pump body according to claim 1, wherein The ejector core box (37) is also fixedly provided with ejector core box sand tamping holes (34), ejector core box rib plate (35), ejector core box outlet core head (36), ejector core box hidden riser (38), and ejector core box open side core head (39). The length of the ejector core box open side core head (39) is 400mm, and the number of ejector core box sand tamping holes (34) is seven.

9. A mold for sand casting a large centrifugal pump body according to claim 8, wherein After the box is closed, the hidden riser (32) on the suction flow channel core box (31), the hidden riser (29) on the suction flow channel core box (27), the hidden riser (38) on the discharge flow channel core box (37), the hidden riser (21) on the tile frame core box (20), and the hidden riser (23) on the tile frame core box (22) form an integral hidden riser from top to bottom, forming a complete side shrinkage channel.

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