KR100613469B1 - Method for manufacturing water pump impeller assembly for automobile - Google Patents

Abstract

The disclosed method for manufacturing a vehicle water pump impeller assembly includes a disk having a boss having a through hole formed at the center thereof, and a plurality of vanes disposed radially with an inclination angle of 20 ° to 30 ° with respect to the boss on one side of the disk. Preparing an impeller having a; Preparing a shroud having a circular hole formed in a center thereof; And combining the impeller and shroud using an ultrasonic welding method. The manufacturing method of the impeller assembly of the water pump for a vehicle having such a configuration increases the bonding force between the vane and the shroud through the ultrasonic welding method, thereby preventing burrs, etc. generated during the adhesion, and improving the reliability of the impeller, and the post-bonding process. It can provide an effect that can minimize the

Ultrasonic Fusion, Impeller

Description

Method for manufacturing water pump impeller assembly {Method for manufacturing water pump impeller assembly for automobile}

1 is an exploded perspective view of a conventional water pump impeller,

2 and 3 are flow analysis results of the water pump impeller shown in Figure 1,

4 and 5 are a perspective view and a plan view of the water pump impeller assembly according to an embodiment of the present invention,

6 is an exploded perspective view of the impeller assembly manufactured by the method of manufacturing the water pump impeller assembly shown in FIG. 4;

7 and 8 are cross-sectional views showing the coupling form of the shroud and vanes in the water pump impeller assembly shown in FIG.

9 and 10 are flow analysis results of the water pump impeller assembly shown in FIG.

<Description of main parts of drawing>

100 ... Impeller 110 ... Disc

120 ... Bane 111 ... Boss

121 ... protrusion 122 ...

200 ... shroud 210 ... coolant inlet

211 ... slit 212 ... engagement hole

214 ... Jam 216 ... Cylindrical section

320 ... vane suction angle 330 ... vane outlet angle

430 ... near cooling water outlet 440 ... near cooling water inlet

500 ... Impeller Assembly

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for a vehicle, and more particularly to a method of manufacturing an impeller assembly for forcibly circulating cooling water.

In general, a water pump for a vehicle engine is a device for circulating coolant in an engine and is composed of an impeller, a mechanical seal, a driving bearing, and a body, and imparts rotational kinetic energy transmitted to the water pump by an engine crankshaft or an electric motor It is a device that forcibly circulates the cooling water in the engine by converting it into kinetic energy of the cooling water through the vane of.

As a water pump impeller used for forced circulation of such cooling water, a structure as shown in Fig. 1 has conventionally been employed.

Referring to the drawings, the water pump impeller 50 has a boss 12 having a through-hole formed in the center thereof, and an impeller upper member having a plurality of vanes 11 radially formed around the boss 12. 20) and a disk-shaped impeller lower member 30 having a circular hole 13 formed in the center thereof.

The upper and lower members 20 and 30 are manufactured by a cold rolling press method, respectively, and then integrally coupled. Here, as a coupling method of the upper member 20 of the impeller and the lower member 30 of the impeller, the impeller The center of the boss 12 of the upper member 20 and the center of the circular hole 13 of the impeller lower member 30 are matched to weld the upper member 20 and the lower member 30 of the impeller, respectively. do.

2 and 3 are views showing the results of flow analysis of the coolant in the impeller when the water pump impeller of this type is manufactured by a cold rolled sheet press working method.

2, it can be seen that the collision occurs due to the vane and the coolant flow in the vicinity of the coolant inlet 42. Then, it can be seen that the vortex is generated on the side of the vane near the cooling water outlet 41.

Similarly, looking directly at the flow analysis from the side shown in Figure 3, it can be seen that the vortex occurs in the vicinity of the coolant inlet 42a.

However, the conventional method of manufacturing a water pump impeller for a vehicle, which is used to manufacture a conventional cold rolled steel plate, is a loss of leakage between vanes of the impeller due to the constraints of vane design due to the structural limitation of the cold rolled sheet press. In addition, hydraulic losses occur due to the collision of coolant flow, vanes, and vortices, which has a problem of lowering the efficiency of the pump.

The present invention has been made to solve the above problems, by optimizing the shape of the vanes impeller assembly capable of reducing the hydraulic losses due to the flow of coolant, collision between vanes and the occurrence of vortex, and prevent the loss of leakage between vanes It is to provide a method of manufacturing.

Method for manufacturing a water pump impeller assembly for a vehicle of the present invention for achieving the above object is (a) a disk having a boss with a through hole formed in the center, and 20 ° to 30 on the one side of the disk centered around the boss Preparing an impeller having a plurality of vanes disposed radially with an inclination angle of °; (b) preparing a shroud in which a plurality of slits are formed spirally on a side surface of which a circular hole is formed at the center and the vanes; (c) combining the impeller and the shroud using an ultrasonic fusion method.

Here, a protrusion having a predetermined height and diameter may be provided at a vertical end of the vane, and a coupling hole corresponding to the protrusion may be formed in the slit of the shroud, and the protrusion and the coupling hole may be fused to each other through ultrasonic waves. .

In addition, one surface of the vane is provided with a conical protruding fusion acid, and the fusion mountain of the vane and the slit of the shroud may be fused and fused by ultrasonic waves.

In addition, the impeller and the shroud may be formed of an engineering plastic material.

In addition, the vanes may be continuously thinner from the inner side to the outer side.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 show a perspective view and a plan view of a water pump impeller assembly according to an embodiment of the present invention.

Referring to FIG. 4, the impeller assembly 500 is formed of an impeller 100 and a shroud 200, and the material is engineering plastic.

Referring to FIG. 5, the vane suction angle 320 has an angle of inclination of the vane and a vane angle of 23 ° based on the point where the coolant inlet section 210 and the vane 120 meet each other, and the vane outlet of the impeller 100 is 23 °. The angle 330 has a tangent angle between the tangential line of the impeller disc 110 and the vane 120 based on a point where the outer circumferential surface of the impeller disc 110 meets the vane 120.

 In addition, the thickness of the vane 120 is formed to become thinner and thinner while going to the outer peripheral surface starting from the boss 111 side.

In this example, the suction angle of the vane and the exit angle of the vane are illustrated as 23 ° and 25 °, but the experiment showed the same effect within the range of 20 ° to 30 °.

Figure 6 shows an exploded perspective view of the vehicle water pump impeller assembly manufactured by the manufacturing method according to the embodiment of the present invention.

Referring to the drawings, the impeller 100 has a disc 110 formed with a boss 111 in the center and a plurality of vanes protruded radially at an angle with respect to the boss 111 direction on one surface of the disc 110. 120. And the protrusion 121 is formed in the thickness surface of each vane 120. As shown in FIG.

In addition, a circular hole 210 is formed at the center of the shroud 200, and a cylindrical portion 216 extending from the circular hole 210 by a predetermined length in one direction is formed. In addition, a vane slit 211 is formed on one surface of the shroud 200 so as to be coupled to the vane 120, and a coupling hole 212 is formed in the slit 211.

7 and 8 show the coupling form of the shroud and the vane in the impeller assembly shown in FIG.

Referring to FIG. 7, the protrusion 121 formed on the thickness surface of the vane 120 is inserted into the coupling hole 212 in the slit 211 formed on the side of the shroud.

Here, since the locking jaw 214 is formed in each of the vanes 120 and the coupling hole 212, when the protrusion 121 is inserted into the coupling hole 212 to a predetermined depth, the vanes 120 and the shroud 200 are formed. The position is fixed. In addition, the coupling holes 212 and the protrusions 121 serve to position and rigidly support the welded material by the shape thereof.

As shown in FIG. 6, the impeller and the shroud of the above configuration are manufactured by injection molding using a mold, and then integrally bonded by ultrasonic welding. First, vanes are joined to the coupling holes 212 of the shroud 200. After the protrusion 121 of 120 is inserted and bonded, the ultrasonic vibration energy is transmitted to the shroud 200 and the vane 120 through the horn. In the coupled coupling hole 212 and the protrusion 121 of the shroud 200 and the vane 120 received the ultrasonic vibration energy, instantaneous frictional heat is generated, and strong molecular bonds occur here, resulting in complete fusion. As a result, an integral impeller assembly 500 is manufactured.

And, referring to FIG. 8, which is another coupling form, the vane 120 is inserted into a slit 211 formed on one surface of the shroud, wherein the vane 120 protrudes from the thickness surface of the vane 120. 122) is formed, the melt acid 122 is a part of the instantaneous melting occurs when ultrasonic welding of engineering plastics also plays a role of a strong bonding force and burr generation after fusion.

9 and 10 are views showing the results of the flow analysis of the cooling water flowing in the impeller assembly of such a configuration.

Referring to FIG. 9, which shows a flow analysis result in the plan view of the impeller assembly, it is found that collision between the coolant flow and the vanes in the vicinity of the coolant inlet 440 is reduced, and the vortices in the vicinity of the coolant outlet 430 are greatly improved. Can be.

That is, since the impeller assembly including the vanes whose shape and angle are optimized can minimize the hydraulic loss in the impeller, the efficiency of the water pump can be increased.

Referring to FIG. 10 showing the results of flow analysis on the side view of the impeller assembly 500, since the shroud is installed on the front surface of the impeller, the leakage loss of the vane 120 is reduced.

Since the impeller assembly manufactured by the ultrasonic fusion method is optimized by using the engineering injection method, the shape of the impeller vane is reduced, thereby reducing the hydraulic loss caused by the collision between the vane and the coolant flow and the vortex in the flow. Since the protrusions and the fusion acid are formed on the vanes of the impeller, the shroud and the fusion are bonded through the ultrasonic fusion method, so that the adhesive force is strong and burr generation can be suppressed after fusion.

As described above, the impeller assembly manufacturing method of the vehicle water pump of the present invention provides the following effects.

First, by using the engineering plastic injection method to maximize the design freedom of the impeller vanes, the hydraulic loss of the coolant in the impeller assembly is reduced, thereby reducing the power consumption of the water engine for the vehicle engine, thereby increasing the efficiency of the water pump and the vehicle. You can increase the output.

Second, the ultrasonic fusion method can prevent the increase of the bonding strength of the vane and shroud and the burrs generated during the adhesion, and minimize the post-bonding process.

Third, the cost of the product can be reduced by strong adhesion without adhesive, and the surface of the product is clean without deformation or alteration.

Fourth, there is an advantage that can easily solve the difficult mold structure of the product.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings and that many more modifications and variations are possible within the scope of the following claims.

Claims (5)

(a) Preparing an impeller having a disk having a boss with a through hole formed in the center, and a plurality of vanes arranged radially on one side of the disk with an inclination angle of 20 ° to 30 ° about the boss. Doing; (b) preparing a shroud in which a plurality of slits are formed spirally on a side surface of which a circular hole is formed at the center and the vanes; (c) combining the impeller and the shroud using an ultrasonic fusion method; One side of the vane is provided with a fusion cone protruding conical, Method of manufacturing a water pump impeller assembly for the vehicle characterized in that the fusion of the vane and the slit of the shroud is fused with each other by ultrasonic. delete delete The method of claim 1, The impeller and the shroud manufacturing method of the vehicle water pump impeller assembly, characterized in that formed of an engineering plastic material. The method of claim 1, The vane is a method of manufacturing a water pump impeller assembly for the vehicle, characterized in that continuously thinner from the inner side to the outer side.

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