CN201271724Y

CN201271724Y - Large-sized middle open type centrifugal pump body cast

Info

Publication number: CN201271724Y
Application number: CNU2008201663011U
Authority: CN
Inventors: 吴文钤
Original assignee: ZHEJIANG JIALI WIND POWER TECHNOLOGY Co Ltd
Current assignee: ZHEJIANG JIALI WIND POWER TECHNOLOGY Co Ltd
Priority date: 2008-10-17
Filing date: 2008-10-17
Publication date: 2009-07-15
Anticipated expiration: 2018-10-17

Abstract

The utility model discloses a pump body casting mould of a large split type centrifugal pump, belonging to casting technique. Since the existing sand core of the casting mould needs to be supported by a chaplet, and the surrounding of the poured chaplet easily generates air hole, so that cast parts are scraped. The pump body casting mould is characterized in that only the inner end and the outer end of an inlet sand core and an outlet sand core are fixed, so that the inlet sand core and the outlet sand core can be vertically arranged in a die cavity; and a clearance is kept between the surfaces of the inlet sand core and the outlet sand core and the wall of the die cavity. The torque relative to the connecting line of the two ends of the sand cores caused because the gravity centers of the sand cores shifts deviate from the connecting line of the two ends can be eliminated, so that the sand cores can be stably upright in the die cavity and not supported by the chaplet, and continuous clearances are maintained between the surfaces of the inlet sand core and the outlet sand core and the wall of the die cavity, thus forming the inlet and the outlet of the cast part without damage, fundamentally eliminating the phenomenon of water seepage of the pump body cast parts, and improving the quality of the cast parts.

Description

Large-scale middle open type centrifugal pump body casting mold

Technical field

The utility model belongs to foundry engieering, especially a kind of large-scale middle open type centrifugal pump body casting mold.

Background technology

By the large-scale middle open type centrifugal pump that the pump housing and pump cover are formed, have the blade wheel chamber of an installation centrifugal impeller that forms by the pump housing and pump cover and water, wet goods medium are discharged with certain pressure from the outlet that the import on the pump housing sucks from the pump housing again so that centrifugal impeller rotates around it the center rotation in blade wheel chamber.The pump of this spline structure, its pump housing and pump cover are individual casts, are assembled together through processing after the pump housing and the pump cover moulding again.Owing to have import and outlet on the pump housing, therefore must in the die cavity of casting mold, core be set so that form the passage of import and outlet.The mode that existing casting mold is provided with core is with die cavity 5 accumbency (accumbency is promptly with respect to the pump housing is fallen to an inclination from user mode), make the core accumbency in die cavity, form the position of import, outlet, and die joint A-A is the centre setting along the corresponding pump housing, by die joint A-A die cavity 5 is divided into up and down two parts and be formed on mo(u)ld top half 81 and mo(u)ld bottom half 61 on, when cast, be accumbency state (referring to Fig. 1,2).

Yet; because import and outlet are because of being communicated with blade wheel chamber; how in the shape of a spiral its shape shape; the line of its two end supports position (being called core print) mid point of core centre-of gravity shift causes the torque of its two ends line relatively for fear of because of accumbency the time; and when cast core be subjected to of the torque (existence of this torque be cause import core and outlet core unsettled principal element) of molten metal buoyancy to this line; must be thereon when therefore import core 3 is with 4 accumbency of outlet core; supporting stud 9 between following two sides and the die cavity wall is used for its location; further; because the large centrifugal pump housing is bulky; therefore for fear of the damage that causes core and sand mold, usually a plurality of studs can be set.And the existence of stud, watering the foundry goods that outpours has a lot of shortcomings: one easily produces pore around stud, they are two years old, at the stud place, molten metal and stud are merged not exclusively, make and often find the infiltration phenomenon when pump housing carries out the water pressure test after machined is finished and scrap.

The utility model content

The technical assignment of the technical problems to be solved in the utility model and proposition is that the core that overcomes existing casting mold need support the defective of being brought that easy generation pore, foundry goods are easily scrapped around stud with stud, and a kind of new large-scale middle open type centrifugal pump body casting mold is provided.For this reason, the utility model adopts following technical proposals:

Large-scale middle-opening pump pump housing casting mold, it comprises sandbox, molding sand, import core, outlet core, molding sand is filled in and constitutes the die cavity that pours into the middle-opening pump pump housing in the sandbox, import core, outlet core lay respectively at the import that forms the middle-opening pump pump housing in the die cavity, the position of outlet, it is characterized in that: only the inner, the outer end to described import core, outlet core fixedly makes the import core, the outlet core is perpendicular puts in die cavity, keeps forming the gap of import wall thickness, outlet wall thickness between the surface of import core, outlet core and the die cavity wall.

As to further the improving and replenishing of technique scheme, the utility model also comprises following additional technical feature, so that be applied to technique scheme when stating technical scheme on the implementation:

The fixed position (being core print) of the center of gravity of described import core, outlet core and its inner, outer end is positioned on the same vertical plane.

The upper end of the corresponding pump housing of described molding sand, the position at place, lower end are provided with two horizontal parting faces, thereby constitute mo(u)ld bottom half, medium-sized, mo(u)ld top half.

The position of the corresponding pump housing of described die cavity upper end places the molding sand bottom, and the position of the corresponding centrifugal pump body of described die cavity lower end places molding sand top, and the inner face of import core, outlet core is supported by molding sand.

The beneficial effects of the utility model are:

Put in die cavity by only the inner, the outer end to import core, outlet core fixedly makes the import core, the outlet core is perpendicular, its two ends line of elimination core centre-of gravity shift as far as possible and cause the torque of its two ends line relatively, can make that core can firm standing in the die cavity, do not re-use stud, keep continuous gap between the surface of import core, outlet core and the die cavity wall, thereby form harmless foundry goods import and outlet, fundamentally eliminate pump housing foundry goods infiltration phenomenon, improve casting quality.

Description of drawings

Fig. 1 is the structural representation (be shown as and do not have die joint this moment) of the casting mold of prior art.

Fig. 2 is the schematic diagram (demonstrate die cavity accumbency and the horizontal parting face of this moment) of the casting mold of structure shown in Figure 1 at casting condition.

Fig. 3 is the structural representation (demonstrate die cavity inversion and the horizontal parting face of this moment) of casting mold of the present utility model at casting condition.

Fig. 4 for the K-K of Fig. 3 to cutaway view (demonstrate die cavity is inverted and the horizontal parting face of this moment).

Among the figure:

1-sandbox, 2-molding sand, 3-import core, 4-outlet core, 5-die cavity, 61/62-mo(u)ld bottom half, 7-medium-sized, 81/82-mo(u)ld top half, 9-stud, A-A/B-B/C-C-die joint.

The specific embodiment

The technical solution of the utility model is described further with preferred embodiment below in conjunction with accompanying drawing.

As Fig. 3, shown in 4, this large centrifugal pump housing casting mold comprises sandbox 1, molding sand 2, import core 3 (profile of the double dot dash line that indicates by " # " among the figure), outlet core 4 (profile of the double dot dash line that indicates by " 0 " among the figure), molding sand 2 is filled in and constitutes the die cavity 5 that pours into centrifugal pump body in the sandbox 1, import core 3, outlet core 4 lays respectively at the import that forms centrifugal pump body in the die cavity, the position of outlet, be characterized in: only to import core 3, the inner of outlet core 4, the core print of outer end fixedly makes import core 3, outlet core 4 erects puts in die cavity 5 import core 3, keep forming the import wall thickness between the surface of outlet core 4 and the die cavity wall, the gap of outlet wall thickness; The inner of so-called core is the end that core closes on blade wheel chamber respectively, and the outer end of so-called core is a be close to the exit end of outer end of core.

Concrete,

The fixed position of the center of gravity of import core 3, outlet core 4 and its inner, outer end is positioned on the same vertical plane, can eliminate its two ends line of core centre-of gravity shift thus fully and cause the torque of its two ends line relatively, can make and firm the standing in the die cavity of core energy not re-use stud.

The upper end of the corresponding centrifugal pump body of molding sand, the position at place, lower end are provided with two horizontal parting face B-B/C-C, thereby constitute mo(u)ld bottom half 62, medium-sized by 7, mo(u)ld top half 82; So that the knockout after moulding and the cast.

The position of die cavity 5 corresponding centrifugal pump body upper ends places the molding sand bottom, the position of the corresponding centrifugal pump body of die cavity lower end places molding sand top, and the inner face of import core 3, outlet core 4 is supported by molding sand 2, be that die cavity is inverted, the actual service orientation that die cavity is upside down in the relative centrifugal pump body of direction of the die cavity that is interpreted as forming the centrifugal pump body foundry goods in the patent specification is inverted, and the advantage of She Zhiing is to be convenient to fixing, the casting pouring of core and the center of gravity that reduces cast like this.

Claims

1, large-scale middle open type centrifugal pump body casting mold, it comprises sandbox (1), molding sand (2), import core (3), outlet core (4), molding sand (2) is filled in and constitutes the die cavity (5) that pours into the middle-opening pump pump housing in the sandbox (1), import core (3), outlet core (4) lays respectively at the import that forms the middle-opening pump pump housing in the die cavity (5), the position of outlet, it is characterized in that: only to described import core (3), the inner of outlet core (4), the outer end fixedly makes import core (3), outlet core (4) is perpendicular puts in die cavity (5) import core (3), keep forming the import wall thickness between the surface of outlet core (4) and the die cavity wall, the gap of outlet wall thickness.

2, large-scale middle open type centrifugal pump body casting mold according to claim 1 is characterized in that the fixed position of described import core (3), the center of gravity that exports core (4) and its inner, outer end is positioned on the same vertical plane.

3, large-scale middle open type centrifugal pump body casting mold according to claim 1 and 2, it is characterized in that the upper end of the corresponding middle-opening pump pump housing of described molding sand (2), the position at place, lower end are provided with two horizontal parting faces (B-B, C-C), thereby constitute mo(u)ld bottom half (62), medium-sized (7), mo(u)ld top half (82).

4, large-scale middle open type centrifugal pump body casting mold according to claim 3, the position that it is characterized in that the corresponding middle-opening pump pump housing of described die cavity (5) upper end places the molding sand bottom, the position of the corresponding middle-opening pump pump housing of described die cavity (5) lower end places molding sand top, and the import core, the outlet core inner face supported by molding sand.