JP4389374B2 - Pump impeller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impeller of a pump provided with a driven magnet.
[0002]
[Prior art]
In recent years, pumps built into devices have been reduced in size by increasing the rotational speed of impellers in the trend of reducing the size and weight of devices. Conventionally, this type of pump is generally one in which a rare earth strong magnet typified by a neodymium magnet is integrally provided in an impeller as a driven magnet, and the rotational speed of the impeller is increased.
[0003]
Hereinafter, a conventional pump will be described with reference to FIG. FIG. 5 is a schematic sectional view of a conventional pump.
[0004]
As shown in FIG. 5, the impeller 1 in the conventional pump has a front shroud 1a and a rear shroud 1b welded, and has a blade 1c in a water passage formed between the front shroud 1a and the rear shroud 1b. The fixed shaft 2 that is inserted therethrough, the slide bearing 3 and the driven magnet 4 positioned outside thereof are integrally provided.
[0005]
In the figure, 5 is a casing that houses the impeller 1, 6 is a thrust bearing that receives the thrust load of the impeller 1, 7 is a stator formed on the outer periphery of the casing 5, and 8 is a fluid fed from the impeller 1. A volute casing for guiding, 9 is a suction port, and 10 is a water discharge port.
[0006]
In the pump configured as described above, when a control current is applied to the stator 7 for driving the impeller, the impeller 1 is driven and rotated by the magnetic field and the driven magnet 4 of the impeller, and the impeller 1 is rotated. By the rotation of the blade 1 c configured in the water passage, the fluid that has been filled is fed from the suction port 9 to the water discharge port 10 through the impeller 1 and the volute casing 8.
[0007]
And the rare earth strong magnets, such as a neodymium magnet, were employ | adopted for the driven magnet 4 of the impeller 1, and the improvement of pump efficiency was aimed at.
[0008]
[Problems to be solved by the invention]
However, the conventional pump configured as described above has a drawback that a rare earth strong magnet represented by a neodymium magnet is easily corroded. Further, the rear shroud 1b and the driven magnet 4 in the impeller 1 are connected to each other. Since it is integrally formed, the rear shroud 1b is formed with an opening 1d after the knockout pin, and in order to prevent corrosion of the driven magnet 4, the exposed opening 1d of the driven magnet 4 is formed. Further, there is a problem that rust prevention means such as expensive coating or addition of a dedicated member is necessary.
[0009]
There are pumps that use a ferrite-based plastic magnet that does not corrode for rust-prevention as a driven magnet, but the ferrite-based plastic magnet has a lower magnetic force than a rare earth strong magnet such as a neodymium magnet. Was disadvantageous.
[0010]
The present invention provides a pump impeller capable of adopting a rare earth strong magnet such as a neodymium magnet as a driven magnet and improving the pump efficiency by its strong magnetic force in consideration of the above-mentioned conventional problems. The purpose is to do.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is an impeller of a pump in which a driven magnet is integrally formed, and an opening that is structurally formed in the impeller by integrally forming the driven magnet is separated. The sealing means is configured to be blocked by mounting a shroud of the member, and prevent the intrusion of circulating water at the closed position.
[0012]
According to the present invention, even if a rare earth strong magnet typified by a neodymium magnet is used as a driven magnet, the opening generated in the structure of the impeller is closed by mounting a shroud as a separate member. Since the sealing means that prevents the intrusion of circulating water is configured at the location, a strong magnet of rare earth such as neodymium magnet can be adopted as the driven magnet, and the pump efficiency can be improved by its strong magnetic force .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 of the present invention is an impeller of a pump in which a driven magnet is integrally formed, and an opening that is structurally formed in the impeller by integral formation of a driven magnet, It is an impeller of a pump that is closed by installing a shroud of another member and has a sealing means for preventing the intrusion of circulating water at the closed position, and the sealing means for preventing the intrusion of circulating water is simple and inexpensive. In addition, it is possible to employ a corrosive rare earth strong magnet such as a neodymium magnet as the driven magnet and to achieve a highly efficient pump by its strong magnetic force.
[0014]
According to a second aspect of the present invention, in the pump impeller according to the first aspect, the sealing means for preventing the intrusion of the circulating water is configured by providing a sealing member at the closed portion of the opening. It has the effect | action that it can manufacture cheaply as a simple structure the sealing means which prevents permeation of circulating water.
[0015]
According to a third aspect of the present invention, in the pump impeller according to the first aspect, the sealing means for preventing the intrusion of circulating water is configured by press-fitting a convex portion of the shroud into the opening. Similarly, the sealing means for preventing the intrusion of circulating water can be manufactured at a low cost with a simple structure.
[0016]
According to a fourth aspect of the present invention, in the pump impeller according to the first aspect, the sealing means for preventing the intrusion of circulating water is configured by adhering and closing the shroud at the opening. Similarly, the sealing means for preventing the intrusion of circulating water can be manufactured at a low cost with a simple structure.
[0017]
According to a fifth aspect of the present invention, in the impeller of the pump according to the first aspect, the sealing means for preventing intrusion of circulating water is formed by welding and closing the shroud in the opening. Similarly, the sealing means for preventing the intrusion of circulating water can be manufactured at a low cost with a simple structure.
[0018]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
(Embodiment 1)
1 is a schematic cross-sectional view of an impeller of a pump according to Embodiment 1 of the present invention.
[0020]
The reference numerals used in the description of the conventional technique and the operating principle of the pump are basically the same as those of the conventional technique, so that the detailed description is omitted according to the conventional technique, and the impeller is different from the conventional technique. Therefore, only the structure of the impeller different from the prior art will be described below.
[0021]
As shown in FIG. 1, the impeller 101 of the pump according to Embodiment 1 of the present invention is integrally formed with the front shroud 101a, the rear shroud 101b, the blades 101c formed on the front shroud 101a, and the rear shroud 101b. The driven magnet 104 is a main constituent member.
[0022]
The blades 101c formed on the rear surface shroud 101b and the front surface shroud 101a are fixed by ultrasonic welding, and the opening 101d that is structurally formed to integrally form the driven magnet 4 in the rear surface shroud 101b has a blade. A convex portion 101e formed on the bottom surface of 101c is fitted with a seal member 110 such as an O-ring interposed, that is, the opening 101d is closed by the convex portion 101e. Further, in order to make the distance between the stator 7 and the driven magnet 4 as small as possible, the thickness on the stator side of the rear shroud 101b formed integrally with the driven magnet 104 is as thin as 0.8 mm to 1.0 mm. It is configured.
[0023]
In the impeller 101 of the pump according to the first embodiment of the present invention configured as described above, the opening 101d of the rear shroud 101b is closed by the convex portion 101e on the blade bottom surface of the front shroud 101a, and further, the opening 101d Since the sealing member 110 is provided as a sealing means for sealing between the convex portions 101e, the circulating water does not enter the driven magnet 104 inside the rear surface shroud 101b. Therefore, a corrosive rare earth strong magnet such as a neodymium magnet can be adopted as the driven magnet 104, and a high-efficiency pump can be provided by its strong magnetic force.
[0024]
(Embodiment 2)
FIG. 2 is a schematic sectional view of the impeller of the pump according to the second embodiment of the present invention.
[0025]
As shown in FIG. 2, the pump impeller 201 of the second embodiment is characterized in that the projection 201e of the front shroud 201a is press-fitted into the opening 201d of the rear shroud 201b to close the opening 201d and circulate. This is a sealing means for preventing water from entering.
[0026]
With this configuration, a corrosive rare earth strong magnet such as a neodymium magnet can be used as the driven magnet 204, and a high-efficiency pump can be provided by its strong magnetic force.
[0027]
(Embodiment 3)
FIG. 3 is a schematic cross-sectional view of an impeller of a pump according to Embodiment 3 of the present invention.
[0028]
As shown in FIG. 3, the pump impeller 301 according to the third embodiment is characterized in that the opening 301d is closed by adhering the projection 301e of the front shroud 301a to the opening 301d of the rear shroud 301b. This is a sealing means for preventing the intrusion of water.
[0029]
With this configuration, a corrosive rare earth strong magnet such as a neodymium magnet can be employed as the driven magnet 304, and a high-efficiency pump can be provided by its strong magnetic force.
[0030]
(Embodiment 4)
FIG. 4 is a schematic sectional view of an impeller of a pump according to Embodiment 4 of the present invention.
[0031]
As shown in FIG. 4, the pump impeller 401 of the fourth embodiment is characterized in that the opening 401d of the front shroud 401a is welded to the opening 401d of the rear shroud 401b to close the opening 401d and circulate water. This is a sealing means for preventing the intrusion of water.
[0032]
With this configuration, a corrosive rare earth strong magnet such as a neodymium magnet can be employed as the driven magnet 404, and a high-efficiency pump can be provided by its strong magnetic force.
[0033]
【The invention's effect】
As described above, according to the present invention, in a pump impeller having a structure in which a driven magnet is integrally formed, an opening that is structurally formed in the impeller is closed by attaching a shroud as a separate member, and Since the sealing means to prevent the intrusion of circulating water at the closed location, it can be manufactured at a low cost with a simple structure, and a strong magnet of corrosive rare earth such as a neodymium magnet can be used as the driven magnet. A highly efficient pump can be provided by magnetic force.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a pump impeller according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view of a pump impeller according to Embodiment 2 of the present invention. Fig. 4 is a schematic cross-sectional view of a pump impeller of Fig. 3. Fig. 4 is a schematic cross-sectional view of a pump impeller of Embodiment 4 of the present invention. Fig. 5 is a schematic cross-sectional view of a conventional pump.
101 impeller 101a front shroud 101b rear shroud 101c blade 101d opening 101e convex 104 driven magnet 110 seal member

Claims (5)

An impeller of a pump in which a driven magnet is integrally formed, and an opening that is structurally formed in the impeller by integrally forming a driven magnet is closed by attaching a shroud as a separate member. An impeller for a pump, characterized in that a sealing means for preventing intrusion of circulating water is provided at a closed portion. 2. The impeller for a pump according to claim 1, wherein the sealing means for preventing intrusion of circulating water is configured by providing a sealing member at a closed portion of the opening. 2. The impeller for a pump according to claim 1, wherein the sealing means for preventing intrusion of circulating water is configured by press-fitting a convex portion of the shroud into the opening. 2. The impeller of a pump according to claim 1, wherein the sealing means for preventing intrusion of circulating water is constituted by adhering and closing the shroud at the opening. 2. The impeller of a pump according to claim 1, wherein the sealing means for preventing intrusion of circulating water is configured by welding and closing a shroud in the opening.

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