JP2020109272A - Fluid pump - Google Patents

Abstract

To provide a fluid pump having high pump efficiency.SOLUTION: A fluid pump comprises a pump shaft 1, and a plurality of impellers 2 and 3 supported by the pump shaft 1. The respective impellers 2 and 3 comprise base plates 2a and 3a, and a plurality of blades 2b and 3b provided so as to keep predetermined intervals in a circumferential direction of the base plates 2a and 3a. The respective impellers 2 and 3 are arranged so as to overlap in a longitudinal direction of the pump shaft 1. When viewed in a direction parallel to the pump shaft 1, each of the blades 3b of the one impeller 3 out of the plurality of impellers 2 and 3 is preferably arranged at a position overlapping with a gap between each pair of the blades 2b and 2b adjacent to each other in the circumferential direction of the base plate 2a of the other impeller 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fluid pump, and more particularly to a fluid pump having high pump efficiency.

Conventionally, there is a fluid 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> Pump efficiency may decrease.
In the fluid pump of Patent Document 1, the impeller may not sufficiently capture the fluid, and the pump efficiency may be low.

An object of the present invention is to provide a fluid pump having high pump efficiency.

The configuration of the present invention is as follows.
As illustrated in FIGS. 1(A) and 1(B), a pump shaft (1) and a plurality of impellers (2) and (3) supported by the pump shaft (1) are provided,
As illustrated in FIG. 1(B), the impellers (2) and (3) are provided at predetermined intervals in the circumferential direction of the substrates (2a) and (3a) and the substrates (2a) and (3a). With multiple blades (2b) (3b),
A fluid pump characterized in that the impellers (2) and (3) are arranged so as to overlap each other in the axial direction of the pump shaft (1).

In the present invention, the fluid overflowing from the blade (2b) of the one impeller (2) to the other impeller (3) is captured by the other impeller (3), so that the pump efficiency is increased.

FIG. 1 is a diagram illustrating a fluid pump according to an embodiment of the present invention. FIG. 1(A) is a vertical cross-sectional view of a main part, FIG. 1(B) is a front view of overlapping impellers, and FIG. 1(C) is low wear resistance. It is explanatory drawing of a film. 2(A) is a front view of the fluid pump of FIG. 1, and FIG. 2(B) is a sectional view taken along line BB of FIG. 2(A).

1 and 2 are diagrams illustrating a fluid pump according to an embodiment of the present invention. In this embodiment, a water pump of 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 fluid overflowing from the blade (2b) of the one impeller (2) to the other impeller (3) is captured by the other impeller (3), so that 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, the fluid overflowing from the gap between the pair of adjacent blades (2b) (2b) of one impeller (2) overlaps with the gap of the blade (2) of the other impeller (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 the fluid 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) in which the frictional resistance of the fluid is reduced are reduced in vibration and 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 pump contains a pump housing (5) shown in FIG. 2(A) for containing the impellers (2) and (3) and a bearing (6) for the pump shaft (1) as shown in FIG. 1(A). 2), and as shown in FIG. 2B, the radiating fins (9) protruding along the corners (8) formed between the pump housing (5) and the boss (7). Equipped with.
For this reason, the cooling efficiency of the fluid and the bearing (6) can be improved 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, fluid leaking from the bearings (6) and the like is radially dispersed by the guide of the plurality of heat radiation fins (9) shown in FIG. 2(A) to avoid concentrated contamination around the pump due to the leaked fluid. 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), the fluid flows in the intermembrane groove (10) as indicated by the arrow.

(1)... Pump shaft, (2)... Main impeller, (2a)... Substrate, (2b)... Blade, (3)... Sub impeller, (3a)... Substrate, (3b)... Blade, (5)... Pump housing , (6)... Bearing, (7)... Boss, (8)... Corner, (9)... Radiating fin.

Claims (7)

A pump shaft (1) and a plurality of impellers (2) (3) supported by the pump shaft (1),
Each impeller (2) (3) comprises a substrate (2a) (3a) and a plurality of blades (2b) (3b) provided at predetermined intervals in the circumferential direction of the substrate (2a) (3a). ,
A fluid pump characterized in that the impellers (2) and (3) are arranged so as to overlap each other in the axial direction of the pump shaft (1). The fluid pump according to claim 1,
When viewed in a direction parallel to the pump shaft (1), a pair of blades (2b) (2b) adjacent to each other in the circumferential direction of the substrate (2a) of one impeller (2) of the plurality of impellers (2) (3). ), the blade (3b) of the other impeller (3) is arranged at a position overlapping with the gap. In the fluid pump according to claim 1 or 2,
A fluid pump, wherein one of the plurality of impellers (2) and (3) is fixed to the other impeller (3). The fluid pump according to any one of claims 1 to 3,
A water-repellent coating is formed on the surface of each impeller (2) (3). The fluid pump according to any one of claims 1 to 4,
A fluid pump characterized in that the surfaces of the impellers (2) and (3) are low friction surfaces. The fluid pump according to any one of claims 1 to 5,
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 fluid pump, characterized in that it is provided with radiating fins (9) protruding along the formed corners (8). The fluid pump according to claim 6,
A fluid pump characterized in that 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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