KR101144108B1 - Vibration welding method for manufacturing manifold for fuel cell - Google Patents

Abstract

The present invention relates to a vibration welding method for manufacturing a fuel cell manifold for forming the inlet and outflow passages of fuel, oxidant, etc. required for the operation of a fuel cell, the neighboring individual manifold of a plurality of injection-molded individual manifolds When the vibration fusion is performed in contact with each other, the position of the dependent deformation due to the vibration fusion in the individual manifold is predicted in advance, and the individual manifolds are pushed on the upper and lower sides of the individual manifolds corresponding to the predicted positions. It is characterized by performing vibration fusion while giving.

Accordingly, the present invention can prevent the dependent deformation caused after the adhesion of the individual manifold during vibration welding by performing the vibration welding in the state of pressing the upper and lower sides of the individual manifold to generate the dependent deformation when the vibration welding for the manufacture of the fuel cell manifold. have.

As a result, the durability of the fuel cell manifold can be improved, and it is possible to prevent leakage due to separation of the adhesive portions between the individual manifolds.

Fuel Cell, Manifold, Vibration Fusion, Dependent Deformation, Jig Core

Description

Vibration welding method for manufacturing fuel cell manifold {Vibration welding method for manufacturing manifold for fuel cell}

The present invention relates to a vibration welding method for manufacturing a fuel cell manifold, and more particularly, to a vibration welding method for manufacturing a fuel cell manifold for forming inlet and outlet passages of fuel, oxidant, etc. required for operation of the fuel cell. It is about.

In general, a fuel cell is a device that generates electricity and heat through an electrochemical reaction between hydrogen and oxygen. A fuel cell is a fuel electrode in which hydrogen, a fuel, reacts to be decomposed into cations and electrons, and a reaction between a cation and oxygen that has moved through an electrolyte. It has a basic structure including an oxygen electrode for making water, and an electrolyte to move the cation generated in the fuel electrode.

Such a fuel cell includes a manifold having a plurality of ports through which fuel, hydrogen, oxygen, and generated water flow in and out.

7 is a perspective view illustrating a manifold manufactured according to a conventional fuel cell manifold manufacturing method.

The plurality of ports 12 formed inside the manifold 10 generally have a layered structure in the vertical direction.

As described above, the manifold 10 having a plurality of ports 12 arranged in an upper and lower layers therein is manufactured of a plurality of layered structures, that is, individual manifolds 11 made of glass fiber, and then bonded to each other by a separate adhesive agent. A manifold 10 having a plurality of ports 12 is formed.

At this time, the individual manifolds 11 arranged vertically adjacent to each other may include a groove 11a for forming a specific port 12, and a combination of the grooves 11a of the individual manifolds 11 bonded up and down. The specific port 12 is formed by.

However, when a single layer of individual manifolds 11 are formed of glass fibers and bonded to each other with an adhesive to form a fuel cell manifold, when manufacturing the individual manifolds 11 from glass fibers, Not only is it difficult to manufacture an accurate individual manifold 11 due to a setting error of a processing tool, but also the adhesive property is disorderedly distributed by pressing when the adhesive is applied and pressed, and the adhesive property may be deteriorated.

In addition, when exposed to high temperature for a long time due to the relationship between the glass fiber which is a material of the individual manifold 11 and the adhesive for bonding are heterogeneous materials, differential deformation may occur, and thus the durability of the manifold 10 This can be degraded.

The present invention has been invented to solve the above problems, in manufacturing the fuel cell manifold in advance by predicting the point at which the dependent strain occurs during vibration fusion, pressing the upper and lower sides of the individual manifold to generate the dependent strain It is an object of the present invention to provide a vibration welding method for manufacturing a fuel cell manifold that can prevent the dependent deformation caused after adhesion of individual manifolds during vibration welding by performing vibration welding in a quasi state.

In order to achieve the above object, the present invention provides a dependent deformation caused by vibration welding in the individual manifolds when vibration welding is performed while neighboring individual manifolds of the plurality of injection molded individual manifolds are in contact with each other. It provides a vibration fusion method for manufacturing a fuel cell manifold by predicting the position in advance, and performing vibration fusion while pressing the individual manifold above and below the individual manifold corresponding to the predicted position.

According to the present invention, vibration welding may be performed while pressing up and down the individual manifolds in which the dependent deformation will occur during vibration welding for the manufacture of a fuel cell manifold, thereby preventing dependent deformation caused after adhesion of the individual manifolds during vibration welding. .

As a result, the durability of the fuel cell manifold can be improved, and it is possible to prevent leakage due to separation of the adhesive portions between the individual manifolds.

There may be a plurality of embodiments of the present invention, and overlapping descriptions of the same parts as in the prior art may be omitted.

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

1 is a perspective view showing an embodiment of a fuel cell manifold manufactured by a vibration welding method for manufacturing a fuel cell manifold according to the present invention, Figure 2 is a separate manifold constituting the manifold of Figure 1 3 is a perspective view illustrating a state in which some of the individual manifolds of FIG. 2 are bonded to each other by vibration welding.

4 and 5 are schematic diagrams showing a vibration fusion process by a vibration fusion method for manufacturing a fuel cell manifold according to the present invention, and FIG. 6A illustrates vibration fusion in an individual manifold when manufacturing a manifold according to the present invention. FIG. 6B is an exemplary view illustrating a normal vibration welding state and a vibration welding distortion occurrence state in manufacturing a manifold.

As illustrated in FIG. 1, the fuel cell manifold 100 includes a plurality of ports 120 into which fuel, hydrogen, air, water, or the like is introduced or discharged.

The number, shape, arrangement, etc. of the ports 120 may be variously changed as necessary and are not limited to those shown in the drawings.

First, the manifold 100 is formed by adhering a plurality of individual manifolds 110 to constitute the manifold 100 by the vibration fusion method for manufacturing the fuel cell manifold according to the present invention.

For example, as shown in FIG. 2, the individual manifolds 110 that will make up the manifold 100 may be formed of four members to be bonded up and down adjacent to each other.

The plurality of individual manifolds 110 are in close contact with each other to form grooves 110c at positions corresponding to each other to form a port 120 of the manifold 100.

The plurality of individual manifolds 110 may be formed by injection molding using a plastic material.

The plurality of individual manifolds 110 formed as described above are bonded to each other by vibration welding to form the fuel cell manifold 100.

2 and 3, a fusion protrusion 110a is formed in one of the neighboring individual manifolds 110, and a fusion groove 110b is formed in the other one.

The fusion protrusion 110a and the fusion groove 110b are formed at a portion where vibration fusion is performed. That is, the fusion protrusion 110a is formed on one of the faces facing each other of the individual manifolds to be bonded to each other, and the fusion groove 110b is formed on the other.

According to an embodiment of the present invention, when the adjacent manifolds 110 adjacent to each other are bonded to each other by vibrating fusion, the fusion protrusion 110a is inserted into the fusion groove 110b as shown on the left side of FIG. 4. Vibration fusion is achieved in the state.

Accordingly, the fusion protrusion 110a and the circumference of the fusion groove 110b are melted to be integrally coupled to each other so as to be in the state shown in the right figure of FIG. 4.

In this manner, the individual manifolds 110 constituting the manifold 100 are coupled to each other by vibrating welding to manufacture the fuel cell manifold 100.

In this case, as shown in FIG. 3, when there are four individual manifolds 110 constituting the manifold 100, two separate manifolds 113 and 114 to be configured below and two separate manifolds to be configured above After the folds 111 and 112 are coupled to each other by vibrating fusion, the manifold 100 is performed by vibrating fusion between the individual manifolds 112 and 113 facing each other at the center of the two manifolds 111, 112, 113, and 114 joined together. Can be prepared.

As shown in FIGS. 4 and 5, one of the individual manifolds 110 adhering to each other when vibration fusion is performed is pressed toward the other 111 and the other 111 is transverse. Can be vibrated.

Accordingly, vibration welding is performed in a state in which two individual manifolds 110 to be bonded are pressed to closely contact each other, thereby enabling more effective welding.

Meanwhile, as shown in FIG. 5, when the individual manifolds 110 are bonded by vibration welding, the present invention predicts the position where the dependent strains will occur in the individual manifolds 110 in advance, and the individual manifolds in which the dependent strains will occur. Press the individual manifolds 110 in the up and down positions of the folds 110.

To this end, vibration welding of the individual manifolds 110 is performed in a state in which the jig core 210 is installed in the jig 200 used for vibration welding of the individual manifolds 110. The jig core 210 is provided to press the point of the individual manifold 110 in which the dependent deformation will occur when the vibration fusion of the individual manifold 110 in the vertical position.

In vibrating fusion of the individual manifolds 110, the dependent deformation caused by the adhesion of the two individual manifolds 110 occurs due to manufacturing errors of the individual manifolds 110 formed by injection molding.

That is, the individual manifolds 110 manufactured by the first injection molding may be slightly different from the designed dimensions and shapes due to errors in the injection molding process. As the part (for example, lack of fusion depth or excessive generation of fusion depth at the time of vibration welding) is adhered, deformation due to an error is transferred to another part, and in the present invention, adhesion between individual manifolds 110 is thus performed. The deformation caused by the displacement caused by the error to another position is called a dependent deformation.

That is, as shown in FIGS. 6A and 6B, when there is an error in the vibration welded portion of the individual manifold 110, the dependent deformation may occur at another position away from the vibration welded point.

If such dependent deformation remains in the individual manifold 110, the force acts in a direction opposite to the adhesion of the bonded portion by vibrating fusion to cause the bonded individual manifold 110 to fall back, thereby Therefore, leakage may occur, and thus, the dependent deformation may act as a factor of lowering the durability of the manifold 100.

Vibration fusion method according to an embodiment of the present invention is to install the jig core 210 in the jig 200 for performing the vibration fusion of the individual manifold 110 in order to prevent this dependent deformation occurs.

That is, the jig core 210 is installed to press the individual manifolds 110 at the up and down positions of the individual manifolds 110 in which the dependent deformation is expected to occur, and thus the individual manifolds 110 through the jig cores 210. Vibration fusion is carried out while pressing the part where the dependent deformation is expected to occur) to regulate the occurrence of the dependent deformation so that the dependent deformation can be prevented by making constant without lack or excessive depth of fusion during vibration welding. The airtightness of the port 120 of the manifold 100 is ensured.

Hereinafter, a method of predicting the position at which the dependent deformation is expected to occur in the individual manifolds 110 during the vibration welding of the manifold 100 will be described.

The position where the dependent deformation will occur in the manufacture of the manifold 100 through vibration welding is to implement a virtual model of the individual manifold 110 formed by injection molding, and use it to deform after vibration fusion of the individual manifold 110. Can be predicted by simulation through structural analysis.

For example, an analysis of plastic injection molding forming the individual manifolds 110 may be performed by a flow analysis program such as a mold flow, and the equivalent of the individual manifolds 110 formed based thereon. The model can be modeled by a program such as catia, and the position of the dependent displacement can be identified through structural analysis using a program such as Nastran using the obtained equivalent model.

As described above, the jig core 210 that predicts the dependent deformation due to the vibration fusion of the individual manifolds 110 by a structural analysis program using a virtual equivalent model and presses the top and bottom of the individual manifolds 110 corresponding to the predicted points. ) By additionally installing the jig to press the individual manifold 110, it is possible to prevent the dependent deformation during vibration fusion of the individual manifold 110 for manufacturing the manifold 100.

Accordingly, the fuel cell manifold can be manufactured more precisely, and leakage can be prevented, thereby increasing the durability of the manifold.

While the invention has been shown and described with respect to certain preferred embodiments thereof, the invention is not limited to these embodiments, and has been claimed by those of ordinary skill in the art to which the invention pertains. It includes all the various forms of embodiments that can be implemented without departing from the spirit.

1 is a perspective view showing one embodiment of a fuel cell manifold manufactured by a vibration welding method for manufacturing a fuel cell manifold according to the present invention;

2 is a perspective view of an individual manifold constituting the manifold of FIG.

3 is a perspective view illustrating a state in which some of the individual manifolds of FIG. 2 are bonded to each other by vibrating welding.

4 and 5 is a schematic diagram showing a vibration welding process by the vibration welding method for manufacturing a fuel cell manifold according to the present invention.

FIG. 6A is a perspective view illustratively illustrating the locations where vibrationally fused portions of individual manifolds and locations where dependent deformation may occur after bonding in the manufacture of manifolds in accordance with the present invention;

Figure 6b is an illustration showing a normal vibration fusion state and vibration fusion distortion generation state in the manifold manufacturing

7 is a perspective view showing a manifold manufactured according to a conventional method for manufacturing a fuel cell manifold;

<Description of the symbols for the main parts of the drawings>

100: manifold

110: individual manifold

110a: fusion process

110b: fusion groove

110c: groove (home of the individual manifold)

120: port

200: jig

210: Jig Core

Claims (3)

When vibration fusion is performed in a state where neighboring individual manifolds 110 are in contact with each other among a plurality of injection molded individual manifolds 110, a position where dependent deformation occurs due to vibration welding in the individual manifolds 110. To predict in advance, while performing vibration fusion while pressing the individual manifold 110 above and below the individual manifold 110 corresponding to the predicted position, The position where the dependent deformation will occur in the individual manifolds 110 is implemented by the virtual model of the individual manifolds 110, and using the same to simulate the deformation after the vibration fusion for fuel cell manifold manufacturing, characterized in that Vibration welding method. delete The method according to claim 1, In one of the neighboring individual manifolds 110, a fusion protrusion 110a is formed at a portion where vibration fusion is performed, and a fusion groove 110b is formed at a portion where vibration fusion is performed. Vibration welding method for manufacturing a fuel cell manifold, characterized in that the vibration welding is made in the state in which the fusion projection (110a) is inserted into the fusion groove (110b).

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