JPS6012957Y2 - volute pump impeller - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to an impeller for a centrifugal pump.

2. Description of the Related Art Conventionally, as shown in FIGS. 1 and 2, the impeller of a typical centrifugal pump has four blades 3 arranged in a straight line outward from the center between the front shroud and the rear shroud 2. As shown in FIGS. 3 and 4, the blades 3 are provided in a curved shape.

The impeller of the first conventional centrifugal pump shown in Figs. 1 and 2 has four blades 3, and each blade 3 extends radially in a straight line outward from the center. Because of its shape, it is easy to remove the side mold when molding with synthetic resin material, which is advantageous in manufacturing, but it has the problem of poor pump efficiency as an impeller. In the impeller shown in FIG. 4, the blades 3' are curved, which increases the pump efficiency, but it is not possible to integrally form the blades 3' with the rear shroud 2, for example. However, it has to be joined or welded to the front shroud 1 afterwards, resulting in a problem of increased manufacturing cost.

The present invention was developed in view of the above problems, and it has been developed to improve pump efficiency by providing curved surfaces on the blades, and to create an impeller for a centrifugal pump that can be easily formed integrally with synthetic resin. The purpose is to provide.

Hand Ribbon to Solve the Problem In order to achieve the above-mentioned purpose in a distant manner, this invention uses four blades for the centrifugal pump, and the rear surface of each blade in the direction of travel is formed into a radial rectangular plane facing outward from the center. In contrast, the front shroud in the direction of travel has a curved surface so that the wall thickness of the blade monotonically decreases as it goes outward from the center, and the front shroud, rear shroud, and each blade are fried as one piece. It is.

Effects With the above configuration, the side mold can be removed and integral formation is possible, so manufacturing is easy, and the pump efficiency is considerably improved compared to the impeller having linear blades.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 5 and 6.

In FIGS. 5 and 6, four blades 6 are provided between the front shroud 4 and the rear shroud 5, and the rear surface 6b is a straight plane facing the direction of movement of each blade 6, and the direction of movement of each blade 6 is The front surface 6a is a curved surface such that the wall thickness of each blade decreases monotonically from the center toward the outside, and
The front shroud 4, the rear shroud 5, and the blades 6 are integrally formed of synthetic resin.

Since the blade 6 is configured as described above and has a shape having a curved surface and a straight surface, the side cores forming the right half and left half shown in FIG. The shrouds 4, 5 and the blades 6 can be integrally molded, making their manufacture easy.

It should be noted that experiments have shown that the impeller of this example, the conventional first impeller shown in FIGS. 1 and 2, and the impeller shown in FIGS.
When the water amount-head characteristics (Q-H characteristics) and input characteristics were examined for each of the conventional second impeller shown in the figure, the results shown in FIG. 7 were obtained.

In FIG. 7, a9'' indicates the case of the conventional first impeller, and b and b' indicate the case of the conventional second impeller.1.
c and C' show the case of this embodiment.

As is clear from FIG. 7, in the case of this embodiment, Q
-H characteristics and input characteristics are intermediate between those of the conventional first impeller and the conventional second impeller.

As described above, the invention has four blades for the centrifugal pump,
By making the rear surface of each blade in the direction of travel a radial tabletop shape facing outward from the center, and making the front surface in the direction of travel a curved surface such that the wall thickness of the blade monotonically decreases as it goes outward from the center, It is possible to form one piece by resin molding, and the pump efficiency can be increased, which has excellent practical effects.

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[Brief explanation of the drawing]

Figure 1 is a partially cutaway plan view of a conventional pump impeller, Figure 2 is a cross-sectional view of the same, and Figure 3 is a partially cutaway plan view of another conventional pump impeller. 5 is a partially cutaway plan view of an impeller according to an embodiment of the present invention, FIG. 6 is a sectional view thereof, and FIG. 7 is a diagram showing the water amount-head characteristics and input characteristics. 4...Front shroud, 5...Rear shroud, 6...Blade, 6a...Front in the direction of travel, 6b...Rear.

Claims (1)

[Scope of utility model registration request] There are four blades between the front shroud and the rear shroud, the rear surface of each blade in the direction of travel is a straight radial plane facing outward from the center, and the front surface of each blade in the direction of travel is directed outward from the center. An impeller for a centrifugal pump, wherein the shroud, the rear shroud, and each of the blades are integrally formed of synthetic resin, the blade having a curved surface so that the wall thickness of each blade monotonically decreases toward the other side.