JP2020109273A - Water pump - Google Patents

Abstract

To provide a water pump having high pump efficiency.SOLUTION: A water pump includes a pump shaft 1 and impellers 2, 3 supported by the pump shaft 1, and a water repellent coat is formed on surfaces of the impellers 2, 3. Alternately, the surfaces of the impellers 2, 3 may be formed as low friction surfaces. The water pump includes: a pump housing 5 which houses the impellers 2, 3; a boss 7 which houses a bearing 6 of the pump shaft 1; and heat radiation fins 9 protruding along a corner part 8 formed between the pump housing 5 and the boss 7. The heat radiation fins 9 are radially formed from a peripheral surface of the boss 7 along a surface of the pump housing 5.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a water pump, and more particularly to a water pump having high pump efficiency.

Conventionally, there is a water pump including a pump shaft and an impeller supported by the pump shaft (see, for example, Patent Document 1).

JP 2004-92495 A (see FIG. 1)

"problem"
In the water pump of Patent Document 1, the flow resistance to the impeller is large, and the pump efficiency may be low.

An object of the present invention is to provide a water pump with high pump efficiency.

(Matters specifying the invention of claim 1)
As illustrated in FIGS. 1A and 1B, a pump shaft (1) and an impeller (2) (3) supported by the pump shaft (1) are provided,
A water pump characterized in that a water-repellent coating is formed on the surfaces of the impellers (2) and (3).
(Matters specifying the invention of claim 2)
As illustrated in FIGS. 1A and 1B, a pump shaft (1) and an impeller (2) (3) supported by the pump shaft (1) are provided,
A water pump characterized in that the surfaces of the impellers (2) and (3) are low friction surfaces.

<<Effect>> Pump efficiency is increased.
According to the present invention, the water-repellent film or the low-friction surface reduces the flow resistance to the impellers (2) and (3) and improves the pump efficiency.
<Effect> Pump noise is reduced.
The impellers (2) and (3) with reduced running water resistance have reduced vibration and reduced pump noise.

It is a figure explaining the water pump which concerns on embodiment of this invention, FIG.1(A) is the elevation sectional view of a principal part, FIG.1(B) is the front view of the impeller which overlapped, FIG.1(C) is a low abrasion. It is explanatory drawing of a film. 2(A) is a front view of the pump of FIG. 1, and FIG. 2(B) is a sectional view taken along line BB of FIG. 2(A).

1 and 2 are views for explaining a water pump according to an embodiment of the present invention. In this embodiment, a water pump for an engine will be described.

As shown in FIGS. 1A and 1B, this water pump includes a pump shaft (1) and a plurality of impellers (2) (3) supported by the pump shaft (1).
As shown in FIG. 1(B), each of the impellers (2) and (3) includes a plurality of substrates (2a) and (3a) and a plurality of substrates (2a) and (3a) that are provided at a predetermined interval in the circumferential direction. Blades (2b) and (3b).
The impellers (2) and (3) are arranged so as to overlap each other in the axial direction of the pump shaft (1).
In this water pump, the water that overflows from the blade (2b) of one impeller (2) to the other impeller (3) is captured by the other impeller (3), so the pump efficiency is increased.

In this embodiment, as the impellers (2) and (3), two main impellers (2) and sub-impellers (3) are used.
These impellers (2) and (3) are formed by pressing cold-rolled steel sheets.

As shown in FIG. 1(B), when viewed in a direction parallel to the pump shaft (1), one of the plurality of impellers (2) and (3) is in the circumferential direction of the substrate (2a) of one impeller (2). The blade (3b) of the other impeller (3) is arranged at a position overlapping the gap between the pair of adjacent blades (2b) (2b).
In this water pump, water overflowing from a gap between a pair of adjacent blades (2b) (2b) of one impeller (2) is overlapped with the gap of the other impeller (3) blade (3). Since it is captured in 3b), the pump efficiency is high.
In the case of this embodiment, one impeller (2) is the main impeller and the other impeller (3) is the sub impeller.

As shown in FIG. 1(A), of the plurality of impellers (2) and (3), one impeller (2) is fixed to the other impeller (3).
In this water pump, vibration is reduced and pump noise is reduced due to the rigidity of the plurality of impellers (2) and (3) that are integrated.

A water-repellent coating is formed on the surface of each impeller (2) (3).
Therefore, the water-repellent coating reduces the flow resistance to the impellers (2) and (3) and improves the pump efficiency as a water pump.
In addition, the impellers (2) and (3) having reduced running water resistance have reduced vibration and reduced pump noise.
A fluororesin film can be used as the water-repellent film.

The surface of each impeller (2) (3) may be a low friction surface.
Also in this case, like the water-repellent coating, the frictional resistance of water to the impellers (2) and (3) is reduced on the low friction surface, and the pump efficiency is increased.
Further, the impellers (2) and (3) with reduced frictional resistance of water have reduced vibration and reduced pump noise.

Specific examples of the low friction surface include a glass coat, a mirror-finished surface of metal, and a low friction film (4) shown in FIG. 1(C).
The low friction film (4) will be described later.

This water pump has a pump housing (5) shown in FIG. 2(A) for accommodating the impellers (2)(3) and a bearing (6) for the pump shaft (1) as shown in FIG. 1(A). As shown in FIG. 2(B), the boss (7) to be housed and the heat dissipation fin (9) protruding along the corner (8) formed between the pump housing (5) and the boss (7). ) Is provided.
Therefore, the cooling efficiency of water and water and the bearing (6) can be enhanced by the heat radiation by the radiation fin (9).

As shown in FIG. 2(B), a plurality of heat radiation fins (9) are radially formed from the peripheral surface of the boss (7) along the surface of the pump housing (5) as shown in FIG. 2(A). Has been done.
Therefore, the rigidity of the pump housing (5) is increased by the plurality of heat radiation fins (9), vibration is reduced, and pump noise is reduced.
Also, water leaking from the bearings (6), etc. is radially dispersed by the guide of the plurality of radiating fins (9) shown in FIG. 2(A) to avoid concentrated pollution around the pump due to leaked water. You can

The low friction film (4) shown in FIG. 1(C) is formed by a film of a material selected from a resin containing a solid lubricant, fluororesin, diamond-like carbon, molybdenum disulfide, graphite, manganese phosphate and chromium. Has been done.
Therefore, the low friction coating (4) can be easily formed by the surface treatment.

Examples of the solid lubricant include inorganic solid lubricants such as transition metal oxides and graphite.
Examples of the resin include polyamide resin, epoxy resin, phenol resin, silicone resin, and polyimide resin.

As shown in FIG. 1(C), a plurality of low-friction coatings (4) (4) are dispersed and arranged in spots, and inter-coating grooves (10) are formed in a mesh shape.
Each of the plurality of low friction coatings (4) and (4) is formed in a regular hexagonal shape.
The plurality of low-friction coatings (4) (4) are not limited to regular hexagonal shapes, but may be various polygonal shapes or circular shapes.
When the blades (2b) and (3b) of the impellers (2) and (3) rotate in the direction of the arrow on the left side of FIG. 1(C), water flows in the intermembrane groove (10) as shown by the arrow.

(1)... Pump shaft, (2)... Main impeller, (5)... Pump housing, (6)... Bearing, (7)... Boss, (8)... Corner, (9)... Radiating fin.

Claims (4)

A pump shaft (1) and an impeller (2) (3) supported by the pump shaft (1),
A water pump characterized in that a water-repellent coating is formed on the surfaces of the impellers (2) and (3). A pump shaft (1) and an impeller (2) (3) supported by the pump shaft (1),
A water pump characterized in that the surfaces of the impellers (2) and (3) are low friction surfaces. In the water pump according to claim 1 or 2,
Between the pump housing (5) that houses the impellers (2) and (3), the boss (7) that houses the bearing (6) of the pump shaft (1), and between the pump housing (5) and the boss (7). A water pump, characterized in that it is provided with radiating fins (9) protruding along the formed corners (8). In the water pump according to claim 3,
A plurality of heat radiation fins (9) are radially formed from the peripheral surface of the boss (7) along the surface of the pump housing (5).

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