JPS5922316Y2 - pump impeller - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pump impeller such as a centrifugal pump.

In this type of pump impeller, the discharge port provided on the outer periphery is discontinuous due to the tip surface of the blade, so there is a break in the water flow discharged from the discharge port due to centrifugal force, and the number of blades is reduced by the impeller. There is a disadvantage that pressure pulsations occur at a frequency corresponding to the value multiplied by the number of rotations, causing vibrations or noise.

This pressure pulsation can be reduced, for example, by reducing the wall thickness of the impeller to reduce the width of the water flow, but the pump design is based on the given pump characteristics, such as castability, etc. Because this is done comprehensively and takes into consideration many factors, it is often difficult to reduce the thickness of the blade just for the purpose of reducing pressure pulsations; There are cases where you have no choice but to make it extremely large.

The present invention was developed in light of these circumstances, and uses a simple configuration in which a specific wedge-shaped water guide groove is provided at the tip of the vane to eliminate the above-mentioned pressure pulsations without causing fluctuations in pump characteristics. It is an object of the present invention to provide a pump impeller that can reduce the amount of water.

In order to achieve the above object, the present invention is characterized by the following configuration.

That is, the present invention is a pump impeller in which the discharge port provided on the outer periphery is discontinuous at the tip surface of the blade, and the water guide groove extending from the rotation leading surface of the blade to the tip surface extends to the vicinity of the rotation lag surface of the blade. This was done to alleviate the discontinuity of the discharged water flow.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is the pump impeller.

This pump impeller 1 has a suction port 2 at its axial center and has a plurality of blades 3 inside.
A discharge port 4 is formed between the tips of the discharge ports 4.

Reference numeral 5 denotes a water guide groove provided at the tip of each of the blades 3.

This water guide groove 5 is a groove extending from the rotation leading surface 3a to the tip end surface 3b of the blade 3, and is wedge-shaped, and the depth and opening width gradually decrease in the rotation lag direction. It is located near the rotation delay surface 3C.

The present invention has the above-mentioned configuration, and a part of the water to be discharged from the discharge port 4 is discharged to the outer circumference through the water guide groove 5, so that the discontinuity of the discharged water flow is alleviated and pressure pulsation is reduced. This eliminates the cause of vibration or noise.

That is, in the conventional type without the water guide groove 5, as shown in FIG. As shown in FIG. 6, the distribution of the discharged water amount Q is averaged over the entire circumference of the impeller 1, so that the above-mentioned pressure pulsation can be greatly reduced.

Moreover, the water guide groove 5 is a small groove provided at the tip of each blade 3 and does not have a large effect on the overall shape of the blade 3, so the provision of the water guide groove 5 may cause fluctuations in pump characteristics. Therefore, it is very easy to implement without the hassle of having to change the design of the entire impeller in order to reduce pressure pulsations.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention;
Fig. 2 is a front sectional view showing the main parts of the same embodiment, Fig. 3 is a plan view thereof, Fig. 4 is a perspective view thereof, and Figs. 5 and 6 are action explanatory diagrams showing the distribution of the amount of water discharged. be. 1... Pump impeller, 3... Vane, 3
a...Rotation advance surface, 3b...Tip surface,
3C... Rotation delay surface, 5... Water guide groove.

Claims (1)

[Scope of utility model registration request] In a pump impeller in which a discharge port provided on the outer periphery is discontinuous at the tip surface of the blade, a wedge-shaped water guide groove that extends from the rotation advance surface of the blade to the tip surface and whose depth and opening width gradually decrease in the rotation delay direction. A pump impeller characterized in that the impeller is formed even near the rotation delay surface of the blade.