CN103521719A

CN103521719A - Narrow-runner impeller casting

Info

Publication number: CN103521719A
Application number: CN201310459874.9A
Authority: CN
Inventors: 沈玉坤; 黄德海
Original assignee: Machinery Manufacturing Co Ltd Of Huzhou Nanfeng County
Current assignee: Machinery Manufacturing Co Ltd Of Huzhou Nanfeng County
Priority date: 2013-09-29
Filing date: 2013-09-29
Publication date: 2014-01-22
Anticipated expiration: 2033-09-29
Also published as: CN103521719B

Abstract

The invention relates to a narrow-runner impeller casting. The impeller casting includes an upper cover plate, a lower cover plate and multiple narrow runners positioned between the upper cover plate and the lower cover plate; the narrow runner width and height gently decrements from inside to outside; a position, positioned at the center of the upside of each narrow runner, on the upper cover plate of the impeller casting is provided with a small hole with a step, and the small holes each are of a square shape. The narrow-runner impeller casting is simple in structure, moreover, can effectively improve the quality of an impeller, reduces the rejection rate of the products, and reduces the cost.

Description

A kind of narrow path impeller foundry goods

Technical field

The present invention relates to a kind of narrow path impeller foundry goods.

Background technology

Hot investment casting leaf castings of wheels, because the larger runner of such impeller diameter is narrower, (impeller maximum gauge φ is more than 200, width of flow path 5-7mm and 5mm thereof are following), generally making this type of impeller is first to go up two to three layers of sand and then remaining small space in runner is tamped and seal (being called stifled sand) with fine sand.Generally directly to do like this, as long as slurry is stained with in assurance and upper sand puts in place, every layer of dry putting in place, stifled sand puts in place.But during sand, particularly when doing the two or three layer of shell, cause three problems on shell processed: 1. while going up sand, because runner is too narrow, can't see the slurry of the inside and sand and whether operate and put in place, if operation does not put in place, the later stage pours and is easy to bleed-out water generates knot iron; 2. even if upper sand operation puts in place, because plane is large, runner is narrow, and runner inside cannot be dried (ventilating not smooth); 3. narrow path impeller is all blocking up sand at present, but light is stifled from water inlet and runner exit, and inside is stifled unreal, and cast also can cause bleed-out water like this, forms knot iron.Because blade and runner are all curvature of space, these knot iron cannot clear in the later stage, directly caused foundry goods to scrap.

Summary of the invention

In order to solve above-mentioned technical problem, the object of this invention is to provide a kind of narrow path impeller foundry goods, this impeller casting is stained with slurry and upper sand puts in place more, and drying effect is better, and stifled sand is more solid.

In order to realize above-mentioned object, the present invention has adopted following technical scheme:

A kind of narrow path impeller foundry goods, described impeller casting comprises upper cover plate, lower cover and a plurality of narrow runner between upper cover plate and lower cover, the width of described narrow runner and highly all successively decreasing gently from inside to outside, the position that is positioned at each narrow runner top center on the upper cover plate of described impeller casting offers the aperture with a step, and described aperture is square.

As preferred version: described aperture is fan-shaped, be more applicable to the impeller casting of all size.

The present invention, owing to having adopted above-mentioned technical scheme, by offer aperture on upper cover plate, makes slurry and sand can enter from aperture the every nook and cranny of runner; In the time of dry, there is mobile air to enter aperture, make which floor shell before stifled sand can be fully dry; When later stage sand removal is processed, from aperture cleaning and the sand that falls, convenient and swift.The present invention is simple in structure, and can effectively improve Impeller Mass, reduces the scrappage of product, reduces costs.

Accompanying drawing explanation

Fig. 1 is that the present invention finishes the structural representation after two or three stratotype shell.

Fig. 2 is the A-A cutaway view of Fig. 1.

Fig. 3 is the sectional structure schematic diagram that the present invention finishes the stifled sand after two or three stratotype shell.

The specific embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is made a detailed explanation.

A kind of narrow path impeller foundry goods as shown in Figure 1, Figure 2 and Figure 3, described impeller casting comprises upper cover plate 1, lower cover and a plurality of narrow runner 3 between upper cover plate 1 and lower cover, the width of described narrow runner 3 and highly all successively decreasing gently from inside to outside, the position that is positioned at each narrow runner 3 top center on the upper cover plate 1 of described impeller casting offers the aperture 2 with a step, and described aperture 2 is square.

After casting cleaning is complete in aperture 2 upper cover upper cover plates welding, although the later stage can produce certain work program, compared with scrap products, still proper way.The benefit that is provided with aperture 2 is: when operation starching and upper sand, starching sand 4 can enter from aperture 2, and therefore some corner operates and put in place, is also convenient to artificially observe operating result, remedies in time; Moving air enters from aperture 2, accelerates drying time and effect, is conducive to the making of later process.When stifled sand, also sand 5 can be poured into from aperture 2 to plug real, make upper cover plate 1 powerful support, reduce the bleed-out water of later stage cast.While clearing up in the later stage, also can be from these aperture 2 cleaning antiquated sands, easily and effectively.

Claims

1. a narrow path impeller foundry goods, it is characterized in that: described impeller casting comprises upper cover plate (1), lower cover and is positioned at a plurality of narrow runner (3) between upper cover plate (1) and lower cover, the width of described narrow runner (3) and highly all successively decreasing gently from inside to outside, the position that is positioned at each narrow runner (3) top center on the upper cover plate of described impeller casting (1) offers the aperture (2) with a step, and described aperture (2) is square.

2. a kind of narrow path impeller cover plate casting according to claim 1, is characterized in that: described aperture (2) is for fan-shaped.