CN101700570B - Grid-shaped airflow guiding device used for cooling large-sized annular cast - Google Patents

Abstract

A grid-shaped airflow guiding device for cooling large annular castings, comprising a first annular connecting plate and an annular second connecting plate arranged in parallel, the first connecting plate and the second connecting plate are connected by at least one evenly distributed vane connect. The airflow guiding device of the present invention can quickly and uniformly cool large annular castings, and avoid deformation, stress concentration and cracks of the castings caused by uneven cooling.

Description

A grid-shaped airflow guide for cooling large annular castings

technical field

The invention belongs to the technical field of casting heat treatment equipment, and in particular relates to a grid-shaped airflow guiding device for cooling large annular castings.

Background technique

When a large casting is forced to be cooled by a fan, the size and angle of the airflow acting on the casting play a key role in the cooling of the casting. At present, only a fan is used to directly blow the airflow to the casting for forced cooling of the casting. The cooling of the casting is not uniform, resulting in deformation of the casting, or the formation of stress concentration and cracks, and the cooling efficiency is low.

Contents of the invention

The object of the present invention is to provide a grid-shaped airflow guiding device for cooling large annular castings, which can quickly and uniformly cool large annular castings, and avoid deformation, stress concentration and cracks of castings caused by uneven cooling.

The technical scheme adopted in the present invention is a grid-shaped airflow guide device for cooling large annular castings, comprising a first annular connecting plate 1 and an annular second connecting plate 3 arranged in parallel, the first connecting plate 1 and the annular second connecting plate 3 The second connecting plate 3 is connected by at least one uniformly distributed vane 2 .

Both ends of the blade 2 are respectively connected to the first connecting plate 1 and the second connecting plate 3 by screws.

The blade 2 has a width of 200mm-800mm and a height of at least 500mm.

The first connecting plate 1 is composed of at least four arc plates.

The second connecting plate 2 is composed of at least four circular arc plates, and the number of the circular arc plates is the same as that of the first connecting plate 1 .

The airflow guiding device of the present invention adopts grid-shaped blades to control the separation of airflow and the angle of blowing in, so that the airflow blown out by the fan can evenly act on the casting, ensuring rapid and uniform cooling of the casting, and avoiding deformation, stress concentration and cracks of the casting , which saves remedial procedures such as repair welding and orthopedics caused by defects such as cracks and deformations in castings, and reduces costs.

Description of drawings

Fig. 1 is a schematic structural view of the airflow guiding device of the present invention.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a schematic diagram of cooling a casting by using the airflow guiding device of the present invention.

FIG. 4 is a top view of FIG. 3 .

In the figure, 1. first connecting plate, 2. blade, 3. second connecting plate, 4. casting, 5. fan.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the airflow guiding device provided by the present invention can make the airflow evenly act on the casting, so that the casting can be cooled evenly and rapidly. The structure of the device includes a first annular connecting plate 1 and an annular second connecting plate 3 arranged in parallel, the structural dimensions of the first connecting plate 1 and the second connecting plate 3 are the same, and the first connecting plate 1 and the second connecting plate 1 The plates 3 are connected by at least one blade 2, and the two ends of the blade 2 are respectively connected with the first connecting plate 1 and the second connecting plate 3 by screws, and the blades 2 are evenly distributed along the circumference of the connecting plate, and the width of the blades 2 is 200mm~ 800mm, 500mm≤the height of the blade 2<the height of the casting.

The number of blades 2 is set according to the actual size of the cooled annular casting, and the inner diameters of the first connecting plate 1 and the second connecting plate 3 are equal to the diameter of the casting 4 plus 300-1000 mm.

In order to facilitate processing, manufacturing and transportation, the first connecting plate 1 and the second connecting plate 3 can be made into circular arc plates, and the two circular arc plates are connected by blades 2 to form a grid-shaped piece. When in use, according to the actual casting Dimensions Assemble 4, 6 or 8 grille pieces into a single airflow guide.

As shown in Figure 3 and Figure 4, the annular casting 4 to be heat treated is put into the airflow guide device, and the screws connecting the blade 2 and the first connecting plate 1 and the connecting blade 2 and the second connecting plate 3 are placed according to the needs of the site. Loosen the screws, and adjust the included angle Φ between the blade 2 and the normal direction of the casting 4 within the range of 0° to 60°. Four groups of fans 5 are evenly distributed on the periphery of the airflow guide device, so that the air outlet of the fan 5 parallel to blade 2. Turn on the fan 5, the cold wind generated by the fan 5 is blown into the airflow guiding device in parallel along the blade 2, reaches the surface of the casting 4, and cools the casting 4, and the cold wind blown in forms a stable spiral upward air flow on the outer surface of the casting 4 , can effectively improve the cooling atmosphere of the casting 4, realize rapid and uniform cooling of the casting 4, and reduce the deformation and residual stress concentration of the casting 4.

During use, according to the size of the casting 4, 2, 3, 4, 6, 8, 9, 10 or 12 sets of fans can be arranged on the periphery of the airflow guiding device.

In the process of forced air cooling, the heat dissipation on the surface of the casting is mainly composed of heat radiation and heat exchange between the casting and the air. Under the same temperature conditions, thermal radiation reduces the temperature of the casting at approximately the same rate. According to the Fourier temperature function, whether the casting can be cooled uniformly depends mainly on the heat transfer between the casting and the air, that is, the heat transfer coefficient between the casting and the air. , and the heat transfer coefficient between castings and air depends on factors such as air temperature, airflow velocity and airflow direction. The airflow guiding device of the invention can effectively realize uniform air velocity on the surface of the casting during the cooling process of the casting, thereby realizing uniform cooling of the casting.

Claims (5)

1. a grid-shaped airflow guiding device for cooling large-scale annular castings, is characterized in that, comprises the annular first connecting plate (1) of parallel setting and the annular second connecting plate (3), the first connecting plate ( 1) and the second connecting plate (3) are connected by at least one evenly distributed vane (2). 2. The airflow guiding device according to claim 1, characterized in that, the two ends of the blade (2) are respectively connected to the first connecting plate (1) and the second connecting plate (3) by screws. 3. The airflow guiding device according to claim 2, characterized in that, the blade (2) has a width of 200 mm to 800 mm and a height of at least 500 mm. 4. The airflow guiding device according to claim 1, characterized in that, the first connecting plate (1) is composed of at least four arc plates. 5. according to the described airflow guiding device of claim 4, it is characterized in that, described second connecting plate (2) is made up of at least four circular arc plates, and the quantity of this circular arc plate and constitutes first connecting plate ( 1) The number of arc plates is the same.

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