JPH0589893U - Centrifugal pump - Google Patents

Abstract

(57) [Summary] [Object] To provide a low-cost centrifugal pump capable of easily forming an impeller having blades having a two-dimensional portion and a three-dimensional portion. In a centrifugal pump in which a blade 8 of an impeller 5 has a two-dimensional portion 9 and a three-dimensional portion 10 and is arranged between side plates 6 and 7, a two-dimensional portion integrally formed with one of the side plates 6 Engagement state 9 between the three-dimensional part 10 and the separately molded three-dimensional part 10
1 and 12 are used to bond 13 to the opposing side plates 6 and 7, respectively. The two-dimensional portion is integrally molded with one side plate, and the three-dimensional portion and the other side plate are individually molded, so that the molding operation is easy, and the two-dimensional portion and the three-dimensional portion are in the engaged state. Since it is adhered, the adhesion work is easy and the adhesion strength is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal pump used in, for example, an automatic water supply device, and more particularly to a centrifugal pump having impeller blades having a two-dimensional portion and a three-dimensional portion.

[0002]

[Prior Art]

 In a general centrifugal pump impeller having a two-dimensional blade whose cross-sectional shape orthogonal to the axis is constant in the axial direction, a blade integrally formed with one side plate a as illustrated in FIG. 4 (A). b and another side plate c separately molded are adhered to each other and are made of a resin material. However, in the case of a blade having a three-dimensional portion whose cross-sectional shape orthogonal to the axis changes in the axial direction, there is a portion f which is a shadow of the three-dimensional portion e as illustrated in FIG. 4B. Die cutting is not possible, and the usual manufacturing method as described above cannot be applied as it is. Therefore, it was necessary to use a core like a universal metal casting, or use a rotary mold.

[0003]

[Problems to be solved by the device]

 In the case of casting using the core as described above, an example shown in FIG. 5 (A) is used to form the blade cores interposed between the upper and lower molds corresponding to both side plates. As shown, a plurality of blade models g molded beforehand from a low melting point alloy (such as tin + bismuth) or water-soluble resin are used. If the blade models g are not melted and removed from the formed sand mold, the core is obtained. I can't. Alternatively, as illustrated in FIG. 5B, a plurality of flow path models h molded from the same material may be put together to form a core. In this case, the flow path model h is melted and removed after the impeller molding. Must. Therefore, in any case, the required man-hours are large and the cost is high.

The present invention has been made based on the above circumstances, and it is an object of the present invention to provide a low-cost centrifugal pump capable of easily forming an impeller having blades having a two-dimensional portion and a three-dimensional portion. To aim.

[0005]

[Means for Solving the Problems]

 The present invention relates to a centrifugal pump in which impeller blades have a two-dimensional portion and a three-dimensional portion and are arranged between a pair of side plates, and a two-dimensional portion integrally molded with one of the side plates and a single molded member. It is characterized in that the three-dimensional parts are adhered to each other while being engaged with each other.

[0006]

[Action]

 In the above structure, the two-dimensional portion is integrally molded with one side plate, and the other side plate and the three-dimensional portion are individually molded, so that the molding operation is easy, and after that, they are bonded in the engaged state. Therefore, the bonding work is easy and the bonding strength is improved.

[0007]

【Example】

 The present invention will be described below with reference to an embodiment shown in FIGS. In FIG. 1, an impeller 5 supported by a main shaft 4 of an electric motor 3 is rotatably mounted inside a casing 1 and a casing cover 2 of a centrifugal pump. The impeller 5 includes a pair of side plates 6 and 7 axially opposed to each other as shown in FIG. 2, and a plurality of side plates 6 and 7 arranged in the circumferential direction between the side plates 6 and 7 (see FIG. 6). Spiral blades 8 (in the case of one sheet). The blade 8 has a two-dimensional portion 9 located outside and a three-dimensional portion 10 located inside.

The two-dimensional portion 9 and the three-dimensional portion 10 of the blade 8 are provided with a concave engagement portion 11 and a convex engagement portion 12 formed in mutually opposing portions, respectively. The two-dimensional portion 9 is integrally molded with one side plate (in the case of FIG. 6) from a suitable resin material, and the other side plate 7 and the three-dimensional portion 10 are individually molded from a suitable resin material. . Then, with the concave engaging portion 11 and the convex engaging portion 12 engaged with each other, the free end of the two-dimensional portion 9 is the other side plate 7, and the free end of the three-dimensional portion 10 is both side plates 6, 7. The impeller 5 is formed by being bonded 13 with each other. The three-dimensional portion 10 and the side plate 6 on one side are aligned with each other by fitting the positioning projection 15 provided on one side to the positioning recess 16 provided on the other side. .

In the above embodiment, as described above, the two-dimensional portion 9 is integrally molded with the one side plate 6, and the other side plate 7 and the three-dimensional portion 10 are individually molded, which facilitates the molding work. Is. Further, since the two-dimensional portion 9 is adhered to the other side plate 7 and the three-dimensional portion 10 is adhered to the both side plates 6 and 7 in a state where the concave engagement portion 11 and the convex engagement portion 12 are engaged, the two-dimensional portion 9 is adhered. The work is easy and the adhesive strength is improved, and it is also effective for power transmission from one side plate 6 to the other side plate 7 via the blade 8.

It should be noted that the present invention is not limited to the above-described embodiment, and, for example, the concave engaging portion 11 and the convex engaging portion 12 are provided in the three-dimensional portion 10 and the two-dimensional portion 9 contrary to the above. You may provide each. Further, the shape of the engaging portion can be set appropriately as illustrated in FIG. Besides, various modifications and applications are possible within the scope of the gist of the present invention.

[0011]

[Effect of the device]

 As described above, according to the present invention, it is possible to easily form the impeller 5 including the wing 8 having the two-dimensional portion 9 and the three-dimensional portion 9, and thus to provide a low-cost centrifugal pump.

[Brief description of drawings]

FIG. 1 is a cutaway side view showing an embodiment of the present invention.

2A and 2B are a cutaway front view and a cutaway side view of an impeller according to the embodiment.

3A and 3B are front views showing different modified examples of the blade in the present invention.

4A and 4B show a relationship between blades and side plates in a conventional impeller, FIG. 4A is a partial sectional view of a two-dimensional portion, and FIG. 4B is a partial sectional view of a three-dimensional portion.

5A and 5B exemplify a conventional core for forming an impeller, FIG. 5A is a cross-sectional view of a core using a blade model, and FIG. 5B is a perspective view of a core using a flow path model.

[Explanation of symbols]

5 ... Impeller, 6, 7 ... Side plate, 8 ... Blade, 9 ... Two-dimensional part, 10 ... Three-dimensional part, 11 ... Concave engaging part, 12 ... Convex engaging part, 13 ... Adhesive part, 15 ... Positioning Protrusions, 16 ... Recesses for positioning.

Claims (1)

[Scope of utility model registration request] 1. A centrifugal pump in which impeller blades have a two-dimensional portion and a three-dimensional portion and are arranged between a pair of side plates, and a two-dimensional portion integrally formed with one of the side plates,
In the state where the three-dimensional part molded independently is engaged with each other,
A centrifugal pump characterized by being adhered to each opposite side plate.