KR20180095189A - Weld zone oxidation prevention and welding equipment of water tank for water purifier including the same - Google Patents

Abstract

The present invention relates to a weld zone oxidation prevention device and a water purifier water tank welding apparatus including the same and, more specifically, to an objective of the present invention is to perform welding while an external surface weld part of a metal material used as a weld base material is covered and an inert gas is filled in a water tank during welding when manufacturing the water tank formed in a water treatment apparatus for edible water to store the edible water so as to prevent inflow of oxygen and impurities including air. In particular, even if an outer shape of the water tank closely adhered in a welding process is changed into a curve from a straight line or is changed into the straight line from the curve, a close adhesion part closely adhered to the water tank is opened/closed or varied in accordance with the outer shape of the water tank. Accordingly, the inert gas is continuously stagnated in the weld part and the inflow of the oxygen is prevented even if the outer shape of the water tank, thereby providing an advantage of preventing oxidation of the weld part. As such advantage, the device is applicable to welding in various fields besides the water treatment apparatus, such as a water purifier, for edible water. Accordingly, reliability and competitiveness are able to be improved in an edible water related field, in particular, a water tank welding field, an oxidation prevention welding field, and also a field related or similar thereto, in addition to a water purifier field and a water purifier water tank field.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus for welding water,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a welding apparatus for welding a water tank and a water tank for water purifier including the same, and more particularly, to a water tank for drinking water, It is possible to prevent the inclusion of oxygen and impurities including air by welding the outer surface welded portion of the metal material used as the welding base material and welding the inner surface of the welded portion with the inert gas filled therein.

In particular, the present invention minimizes the consumption of the inert gas used during welding by stagnating the inert gas filled in the welded portion, and protects the periphery of the welded portion or the welded portion from oxygen to prevent the oxidation caused by butt welding And to prevent the deterioration of the quality of the appearance of the manufactured product, and a welding apparatus for water tank for water purifier including the same.

The method of joining metal materials is largely a mechanical joining method and a metallurgical joining method. Generally speaking, welding refers to a metallurgical joining method. In particular, arc welding uses fusion welding using an arc as a heat source It is one of the most widely used methods.

TIG (Tungsten Inert Gas) welding, which is one of arc welding, is a method in which an electrode is used as a tungsten and an inert gas such as helium or argon is injected while welding, and there is a merit that metal oxides are generated or impurities are mixed little .

In particular, TIG welding has advantages such as arc stability and weld metal characteristics because arc and melted parts are protected by inert gas, and arc welding currently used means almost TIG welding.

On the other hand, inert gas refers to a monomolecular molecule that maintains a stable state with a single atom. Helium, neon, argon, krypton, xenon and radon correspond to this. In the case of nitrogen, it is not a monomolecular molecule, It can be included in an inert gas.

However, such arc welding has the following disadvantages.

Although arc welding is less susceptible to the generation of metal oxides or impurities than the other welding methods, there is a problem in that it requires excessive consumption of an inert gas which is sprayed and rapidly diffused into the air in order to effectively protect the welded portion.

In addition, since the inert gas is injected, a part of the welded portion or the periphery of the welded portion is not sufficiently protected and is exposed to oxygen, and a portion of the welded portion or the welded portion not protected by the inert gas is discolored due to high temperature heat and oxygen, Thereby deteriorating the quality of the appearance.

In order to remove the metal oxide, it is necessary to carry out an additional process. As a result, it takes a very long time to increase the production cost of the product. Even if the metal oxide is removed through the additional process, the metal material is whitened by oxidation , It is easily damaged due to corrosion, so oxidation must be prevented.

On the other hand, in the case of the metal material to be welded, a gap is generated in the welded portion due to a machining error that is necessarily generated in the process of machining, and the welded heat is transferred to the opposite side of the welded portion through the gap, .

In addition, irregular shape deformation occurs during press forming of the metal material, which may cause the same or similar problems as the above-mentioned problems.

In other words, in the process of joining the two metal materials, due to machining errors occurring in the machining process of the metal material, irregular deformations partially occurring in the pressing method such as press forming and roll forming, A gap is formed in the butt portion of the metal material, and an arc is formed on the opposite side of the welding side through the corresponding gap.

As a result, the arc welding known so far has a problem in that oxidation can be prevented to some extent due to injection of an inert gas, but oxidation on the opposite side can not be prevented.

Such a problem may be a very important problem in an apparatus for providing drinking water. For example, in the case of a water purifier, water supplied from the outside is purified and stored in a water tank, and then supplied to cold water or hot water according to a user's operation. In the water tank, When the oxidation occurs, the drinking water stored in the water tank is contaminated, which adversely affects the health of the user.

Korean Registered Patent No. 10-1361677 'Inert gas arc welding torch'

In order to solve the above-mentioned problems, the present invention provides a water tank for drinking water, which is constituted by a water treatment apparatus for drinking purposes, and surrounds an outer surface welded portion of a metal material used as a welding base material during arc welding The present invention also provides a welding apparatus for a water purifier for use in a water purifier, which can prevent contamination of oxygen and impurities including air by welding in an inert gas filled state.

In addition, since inert gas filled inside is stagnated in the welded portion, consumption of the inert gas to be used during welding can be minimized, and oxidation of the welded portion or the welded portion by oxygen is prevented to prevent the oxidation caused by butt welding, And to provide a water tank welding apparatus for a water purifier including the same.

On the other hand, when the external shape of the water tank adhering to the welding process is changed from a straight line to a curved line or from a curved line to a straight line, a gap is formed in the close contact portion, so that the inert gas is not stagnated, And oxidation may occur.

In order to prevent this, according to the present invention, it is possible to make the inert gas closely contact with the water tank so that it can be opened or closed corresponding to the outer shape of the water tank or can be changed even if the outer shape of the water tank changes. And is capable of preventing oxygen from flowing into the inside thereof, and a water tank welding apparatus for water purifier including the same.

Also, the present invention provides a welded hot-dip galvanization zone and a water tank welding apparatus including the welded hot-dip galvanizing zone, which can prevent contamination of drinking water by preventing oxidation of the inner surface as well as the outer surface of the water tank during the welding process There is a purpose.

Particularly, in the process of welding a water tank by arc welding, the inside of the water tank is formed into a vacuum or filled with a filling inert gas to remove all the oxygen, and then the outside of the water tank is welded, Which can prevent the occurrence of oxidation, and a water tank welding apparatus for water purifier including the same.

On the other hand, when a clearance is formed in the welded portion due to the irregular shape deformation occurring in the water tank press forming, even if the inside of the water tank is filled with the inert gas, the inert gas is discharged in the gap in the course of welding, The air containing oxygen may be introduced into the chamber and oxidation may occur.

In order to prevent this, according to the present invention, a negative pressure is formed in the water tank to prevent the inactive gas from being discharged beforehand, thereby blocking the inflow of oxygen into the water tank. In the same way or similar manner, Which is capable of preventing oxygen from flowing into the welding part by removing all of the oxygen in the welding water tank, and a welding apparatus for water tank for water purifier including the same.

In order to accomplish the above object, the present invention provides an arc welded arc welding base including an oxidation preventing main body in which a welding torch for arc welding of a welding base material is inserted and an inert gas is filled therein during arc welding, And an isolation cover which is spatially connected to the oxidation preventing body and is configured to surround the welded portion by forming a corresponding external shape corresponding to the external shape of the welded base material.

In addition, the anti-oxidation body may include a welding torch for arc welding the welding portion. At least one gas supply portion to which the inert gas is supplied and at least one gas discharge portion through which at least a portion of the inert gas is discharged, and the isolation cover may be formed with a guide groove to correspond to the weld portion.

Further, it is preferable that the linear elastic contact cover further include a linear elastic cover that is movable to open and close the outer shape corresponding tight contact portion, and a first elastic body that applies an elastic force to the linear elastic cover so as to press the linear elastic cover to the outer shape corresponding tight contact portion. The linear contact cover is moved up to the anti-oxidation main body side while the linear contact cover is lifted, and the external shape corresponding adhesion portion of the isolation cover can be brought into close contact with the welding base material.

The linear contact cover may further include at least one contact cover guide for guiding movement of the linear contact cover, and the linear contact cover may be moved along the contact cover guide to the anti-oxidation body side or the outer shape corresponding contact portion side .

The outer cover has a second elastic body whose shape is varied by an elastic force. The outer cover has a shape corresponding to contour corresponding to the deformation of the second elastic body, When the outer shape of the welding base material is changed from a straight line portion to a curved portion at the time of arc welding, the outer shape correspondingly adhered portion may be deformed to the side of the anti-oxidation main body and adhered to the welding base material.

In addition, the isolation cover may further include a crack preventing portion that is in close contact with the welding base material during arc welding to prevent cracking by the second elastic body.

Next, a welding apparatus for a water purifier for a water purifier including a welding piping discharge zone according to the present invention comprises: a chamber configured to be able to seal an internal space; and an upper case and a lower case of a housing for a water tank, A movable module for moving the jig to move the welded portion of the upper case and the lower case into contact with each other, and an inert gas filling body for covering the welded portion, And a welding torch for arc welding a welded portion of the upper case and the lower case, which are inserted into the welded bushed earth and are closely contacted with each other.

The welding torch may further include a cooling nozzle for rapidly cooling a welded portion welded by the welding torch. The welding torch portion may include a nozzle insertion portion into which the cooling nozzle is inserted.

In addition, the welding and pressurizing strip may be closely contacted with the contour corresponding to the external shape corresponding to the curved surface or the planar shape of the water tank housing to isolate the welded portion.

The apparatus further includes a nitrogen supply module for supplying nitrogen to the inside of the water tank housing when the welded portions of the upper case and the lower case are in close contact with each other. And the outer side is formed into an inert gas atmosphere so that the welded portion of the housing can be welded.

According to the above-mentioned solution, the present invention is characterized in that, in the arc welding, the outer surface welded portion of the metal material used as the welding base material is wrapped and welded with the inert gas filled therein, There is an advantage that mixing can be prevented.

In addition, since the inert gas filled inside is stagnated at the welded portion, it is possible to minimize the consumption of the inert gas used at the time of welding.

In addition, there is an effect that the quality of the appearance of the product can be prevented from deteriorating by protecting the periphery of the welded portion or the welded portion from oxygen to prevent the occurrence of oxidation by butt welding.

Particularly, in the present invention, even when the external shape of the water tank adhering to the welding process is changed from a straight line to a curved line or from a straight line to a curved line, the close contact portion which is in close contact with the water tank is opened / closed corresponding to the external shape of the water tank, So that even if the outer shape of the water tank changes, inert gas can be continuously stagnated in the welded portion and oxygen can be prevented from flowing into the welded portion.

In addition, the present invention has an advantage that it is possible to prevent oxidation of the inner surface of the water tank as well as the outer surface of the water tank, thereby preventing the drinking water stored in the water tank from being contaminated.

In other words, there is an advantage that oxidation does not occur in the inside of the welded portion in the process of arc welding the outside of the metal material configured to be interrupted inside and outside.

By virtue of these advantages, the present invention can be applied not only to a water treatment apparatus for drinking water such as a water purifier but also to various devices, buildings and structures, thereby improving stability and reliability as well as oxidation, nitrification and corrosion prevention of objects.

In order to remove oxygen in the water tank, the present invention forms a negative pressure in the process of filling the inside of the water tank with the inert gas, thereby preventing the outflow of the inert gas in the water tank, There is an advantage that the inflow can be blocked.

In addition, by extending this concept to the chamber, there is an advantage that oxygen can be prevented from flowing into the welding part.

Therefore, it is possible to improve the reliability and competitiveness in the drinking water related field, particularly in the water purifier field and the water purifier water tank field, as well as in the water tank welding field and anti-oxidation welding field as well as similar or related fields.

FIG. 1 is a perspective view showing an embodiment of a welding piping inflation zone according to the present invention.
FIG. 2 is a bottom perspective view of the welded busbars shown in FIG. 1 and the flow of the inert gas. FIG.
3 is a bottom perspective view showing another embodiment of the welding piping discharge zone according to the present invention.
4 is a cross-sectional view illustrating movement of the linear close cover shown in Fig.
FIG. 5 is a partially enlarged cross-sectional view showing another embodiment of a welding piping discharge zone according to the present invention.
FIG. 6 is a partially enlarged cross-sectional view showing a state in which an elastic body is further included in the welding piping discharge earth shown in FIG.
FIG. 7 is a flowchart showing an embodiment of a welding method of a water tank welding apparatus for a water purifier including a welding piping earth zone according to the present invention.
FIG. 8 is a flowchart showing a specific embodiment of steps 'S200' and step 'S300' shown in FIG.
FIG. 9 is a graph for explaining the function of the process 'S330' shown in FIG.
FIG. 10 is a structural view showing an embodiment of a water tank welding apparatus for a water purifier including a welding piping discharge zone according to the present invention.
Figs. 11 to 14 are views for explaining a process of welding a water tank according to Fig. 10. Fig.

The welding apparatus of the present invention can be applied to various types of welding apparatuses for welding water tank for water purifier and a water purifier tank including the same, and the most preferred embodiments will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view illustrating an embodiment of a welding piping inflation zone according to the present invention, FIG. 2 is a bottom perspective view of the welding piping inflation zone shown in FIG. 1, and the flow of an inert gas.

Referring to FIG. 1, a welded pipe fuselage 100 according to the present invention includes an anti-oxidation body 110 and an isolation cover 120.

First, a space is formed in the oxidation preventing main body 110 so that an inert gas supplied to the gas supplying unit 112, which will be described later, is filled therein.

An inert gas is a monomolecular molecule that remains stable in a single atom as described above and may include one of helium, neon, argon, krypton, xenon, radon, and nitrogen.

As shown in FIG. 1, the oxidation-preventing main body 110 may be formed in a bent shape in which a bottom surface to which the inert gas is supplied is opposed. In order to allow the inert gas to be filled therein to move in a fluid manner while colliding with the curved bottom surface, the inert gas may be variously formed as long as the inert gas is allowed to move in the fluid .

In addition, the anti-oxidation main body 110 is provided with a torch inserting portion 111 for inserting a welding torch for welding a metallic material (hereinafter, referred to as 'welding base material') to be welded.

The torch inserting portion 111 is preferably formed on the upper portion of the oxidation preventing main body 110 and may be formed in a hole shape or a protruding tubular shape as shown in FIG.

In addition, the oxidation preventing main body 110 is formed with a gas discharging portion 113 for supplying an inert gas into the inside thereof.

The gas discharging unit 113 is formed on the upper portion of the oxidation preventing body 110, but may be formed on the side surface or the back surface (refer to FIG. 1) as required.

In the meantime, in the case where the welded bushed zone 100 according to the present invention is applied to a welding torch capable of injecting an inert gas, the oxidation preventive body 110 can open and close the gas supply passage of the gas discharge unit 113 And a torch inserting unit 111 may be formed.

The anti-oxidation body 110 may be formed with at least one gas discharging portion 113 through which at least a portion of the inert gas filled therein is discharged.

This is to prevent a problem that when the inert gas filled in the oxidation preventing main body 110 becomes excessive, the welding by-pressurizing strip 100 may exhibit an irregular movement in the welding process due to the excessive pressure.

Referring to FIGS. 1 and 2 (a), the isolation cover 120 is provided to close a welded portion of the welding base material so that the inert gas filled in the oxidation preventive body 110 is stuck to the welded portion. And may be integrally formed with the main body 110.

It is preferable that the isolation cover 120 is formed at the opposite portion of the torch inserting portion 111 and connected to the inner space of the oxidation preventing body 110 so that the inert gas filled in the oxidation preventing body 110 flows.

As shown in FIG. 2 (a), the isolation cover 120 is formed in a rectangular shape in close contact with the welding base material to surround and surround the welding portion. However, the isolation cover 120 is not limited thereto, And may be variously formed as long as it can be in close contact with the welding base material.

On the other hand, it is preferable that the lower portion of the isolation cover 120, that is, the outer shape correspondingly adhering portion 121 which is in close contact with the welding base material, is formed so as to be in contact with the outer shape of the welding base material.

The outer shape correspondingly adhering portion is formed in an arc shape so that it can be closely contacted when the outer shape of the welding base material to be welded is a cylindrical shape. However, if the welding base material is formed into a linear shape, it can be provided linearly so as to be closely contacted thereto.

In addition, the welded busbars 100 may be configured such that the isolation cover 120 corresponds to a welding base material including an arc shape (hereinafter referred to as a "curve") and a linear shape (hereinafter referred to as a "straight line" And description thereof will be described in detail in another embodiment and another embodiment which will be described later.

As described above, the welded busbars 100 having the isolation cover 120 can be welded to the welded base material to cover the welded portion, and the inert gas filled in the oxidation-resistant body 110 can be stuck to the welded portion .

1 and 2 (a) and 2 (b), in order to prevent the isolation cover 120 from interfering with the weld when the welding base material rotates or the welding torch moves in a state of being closely attached to the welding base material, The guide groove 122 may be formed on both sides of the isolation cover 120 so as to correspond to the welded portion of the welding base material.

2 (b), the inert gas is filled and stagnated in a state where the welded portion is wrapped, and the welded base material or welding Therefore, it is possible to effectively prevent mixing of oxygen and impurities including air in the process of arc welding, to minimize the consumption of the inert gas because the inert gas is not diffused, By preventing the occurrence of oxidation, it is possible to prevent the deterioration of the appearance of the manufactured product beforehand.

Hereinafter, even when the outer shape of the welding base material changes from a curved line or a curved line to a straight line in the process of arc welding, the outer shape correspondingly-fitting portion 121 may be in contact with the outer surface of the welding base material, (100) will be described.

FIG. 3 is a bottom perspective view showing another embodiment of the welding piping discharge zone according to the present invention, and FIG. 4 is a cross-sectional view illustrating movement of the linear close cover shown in FIG.

3 and FIG. 4, the welded busbars 100 according to the present invention include a linear contact cover 131 and a linear contact cover 130 so as to be able to closely contact with the shape of the welding base material including both straight and curved outlines And includes a first elastic body 132.

3, the linear close cover 131 is in close contact with the welding base material instead of the outer shape corresponding tight contact portion 121 formed in an arc shape. As shown in FIG.

The linear close cover 131 according to the present invention is formed in a rectangular shape, but is not limited thereto. The linear close cover 131 may be variously provided as long as it is in a straight line contact with a welded base material having a straight outer shape .

In addition, a welding cover guide 133 for guiding the movement of the linear closing cover 131 from the inside may be formed in the welding flux drawing zone 100, and the welding cover guide 133 is formed of at least one, Thereby guiding the movement of the cover 131.

Although not shown in the drawing, the welding piping 100 may be fixed in position in a state in which the linear close cover 131 is moved toward the anti-oxidation main body 110 or in a state of being moved toward the isolation cover 120, And may include a cover fixing portion.

The welded bushed earth 100 is fixed to the anti-oxidation main body 110 side by welding the welding base material having the curved outline only through the cover fixing portion, The linear close cover 131 may be fixed to the outer cover corresponding to the outer cover corresponding to the outer cover 120 and may be brought into close contact with the welding base material when the welding base material having only a linear outer shape is welded. can do.

Accordingly, it is possible to closely adhere to the welding base material formed by the outer shape of the straight line and the curved line.

Meanwhile, the welding piping zone 100 may include a first elastic body 132 for providing an elastic force to the linear close cover 131 to change the position of the linear close cover 131.

The first elastic body 132 of the present invention is formed of a compression coil spring having a force against a compression force. However, the present invention is not limited thereto. For example, the elastic force may be applied to the linear close- It can be applied variously as long as it is an elastic body that can be provided.

The first elastic body 132 may be disposed on one side of the linear close cover 131 and on the other side of the first elastic body 132 to be connected to the inside of the anti- have.

When the first and second elastic members 132 and 132 are pressed against the welding base material of the straight line during normal or arc welding by the pressing of the first elastic body 132, As shown in FIG. 4, when the outer shape of the welding base material changes from the straight portion to the curved portion, the linear close cover 131 is raised toward the anti-oxidation main body 110, 121 may be in close contact with the curved welding base material.

Therefore, even if the external shape of the welding base material changes from a straight line to a curved line or from a curved line to a straight line in the course of arc welding, the inert gas can be continuously stuck to the welded portion, Can be blocked.

In addition, the welding piping system 100 may be formed to correspond to the external shape of the welding base material according to another embodiment, and will be described in detail.

FIG. 5 is a partially enlarged cross-sectional view showing another embodiment of a welded bushed earth according to the present invention, and FIG. 6 is a partially enlarged sectional view showing a state in which an elastic body is further included in the welded bushed earth shown in FIG.

Referring to FIG. 5, the welding piping system 100 according to the present invention is configured such that the external shape correspondingly fastening portions 121 are deformed in shape so as to be close to each other in correspondence with the shape of the welding base material including both straight and curved external shapes. A second elastic body 123 having an elastic force so as to be able to be rotated.

The second elastic body 123 may be formed of an elastic body such as a leaf spring including an elastic force that is deformed at the time of pressing and restored to its original shape when the pressing is stopped.

5, the second elastic body 123 may be provided parallel to one end of the isolation cover 120, but may be formed by forming a curved portion in a side close to the welding base material, May be variously provided so long as it is in a shape that does not generate a clearance when it is brought into close contact with the straight welding base material.

Both sides of the second elastic body 123 can be fixed to the elastic cover 124 provided inside the welding piping 100. The second elastic body 123 can be fixed to the isolation cover 120 on both sides.

5, when the second elastic body 123 is deformed toward the anti-oxidation main body 110, the isolation cover 120 is shrunk to the anti-oxidation main body 110 side in response to the deformation of the second elastic body 123 It is preferable that the portion where the guide groove 122 is not formed is formed to be soft and the contraction corresponding to the contour is formed.

Although not shown in the drawing, the contraction portion of the isolation cover 120 may be formed in the form of a wrinkle or a bellows, but the present invention is not limited thereto. .

As described above, when the outer shape corresponding fastening portion 121 is provided with the second elastic body 123 whose shape is changed by pressing, the outer shape corresponding fastening portion 121 is formed such that even if the outer shape of the welding base material changes from a straight portion to a curved portion The separating cover 120 is partially contracted toward the anti-oxidation main body 110 and the outer shape correspondingly fastening part 121 can be closely attached to the curved welding base material .

5, even if the outer shape of the welding base material changes from a straight line portion to a curved portion as shown in FIG. 5, the outer shape corresponding contact portion 121 is pressed against the oxidation preventing main body 110 So that the isolation cover 120 is partially contracted and can be also brought into close contact with the curved welding base material.

Meanwhile, the welding piping 100 may further include a third elastic body 125 to provide an elastic force to the second elastic body 123. This is because the adhesion of the outer shape corresponding fastening portion 121 to the external fastener corresponding to the external shape corresponding tightening portion 121 formed by the second elastic body 123 is made to be close to the external shape corresponding to the external shape of the linear fastening base material through the elastic force of the third elastic body 125 So as to prevent a gap through which oxygen can flow, and in the opposite case, it is possible to quickly deform the external-shape corresponding fastening portion 121, which is deformed by bending, to a normal state.

In addition, the cracking preventing portion 126 may be formed on the second elastic body 123 of the welding piping covering region 100.

The crack preventing portion 126 prevents cracks that may occur in the outer surface of the welded base material by the second elastic body 123 when the second elastic body 123 is in close contact with the welded base material.

Therefore, even if the external shape of the welding base material changes from a straight line to a curved line or from a curved line to a straight line in the course of arc welding, the inert gas can be continuously stuck to the welded portion, Can be blocked.

Hereinafter, a welding apparatus for a water tank for a water purifier including the welding piping discharge zone according to the present invention described with reference to FIGS. 1 to 6 will be described in detail.

FIG. 7 is a flowchart showing an embodiment of a welding method of a water tank welding apparatus for a water purifier including a welding piping earth zone according to the present invention.

7 shows a water tank for a water purifier. The water tank for a water purifier is composed of a housing in which the inside of the water purifier is hermetically sealed. The housing can be manufactured by welding the upper case and the lower case.

Of course, the design structure may be changed depending on the shape and configuration of the water purifier water tank, the size and the use of the product, and thus, a plurality of cases may be welded to be deformed as a single housing or the like. Since the welding method has its technical features, the following description will be made with reference to an example in which a housing for a water tank is manufactured by welding an upper case and a lower case as described above.

Referring to FIG. 7, the method for welding water purifier water tank for preventing oxidation of the inside of the welded portion includes a case butting step S100, an inert gas filling step S200, and an arc welding step S300.

The case butting step (S100) is a process of closely adhering the welded portion of the metal material to be welded, and the welded portions of the upper case and the lower case constituting the housing to be used as the water tank are closely contacted.

In the inert gas filling step (S200), an inert gas is filled in the upper case and the lower case with which the welded portions are closely contacted. When the inert gas is filled in the housing composed of the upper case and the lower case , The oxygen existing inside the housing can be discharged to the outside of the housing. Herein, the inert gas may include monomolecular molecules such as helium, neon, argon, krypton, xenon, and radon, and the molecule may include nitrogen.

Here, inert gas is also applied to the inside of the welded busbars, which are tightly attached to the housing through a welding torch or a separate inert gas supply device and surround the welds.

This is to prevent the oxygen present in the chamber from flowing into the interior of the welding piping.

The arc welding step (S300) is a process of welding the outside of the welded portion of the housing in an inert gas atmosphere in a state in which all the oxygen inside the housing is discharged.

As described above, when the arc welding is completed through the inert gas filling step (S200), the inside and the outside of the housing can be welded so as to prevent oxidation.

Hereinafter, each step will be described in more detail.

FIG. 8 is a flowchart showing a specific embodiment of steps 'S200' and step 'S300' shown in FIG.

Referring to FIG. 8, the inert gas filling step (S200) may include a vacuum forming step (S210) and an inert gas filling step (S220).

First, as shown in FIG. 7, when the inert gas is filled in the housing, the oxygen contained in the air may not be smoothly discharged depending on the internal structure of the housing. For example, oxygen present in parts such as internal components or corners inside the housing can remain in the housing without being spilled out even if an inert gas is supplied from the outside, The inside of the housing can be oxidized.

The vacuum forming process (S210) is a process of removing the oxygen present inside the housing by sucking the inside air of the housing. When the internal pressure of the housing is lowered, the air inside the housing is discharged regardless of the internal structure of the housing. It is possible to prevent the problem that oxygen remains.

On the other hand, if welding is performed with the vacuum formed inside the housing, the air can be re-introduced through the gap formed in the close portion (welded portion) of the upper case and the lower case as described above.

Therefore. After the inside of the housing is formed in a vacuum, the oxygen contained in the air can be prevented from being re-introduced into the housing by the pressure difference by filling the inside of the housing with inert gas (S220).

At this time, when the pressure inside the housing filled with the inert gas is equal to the external pressure, the inert gas filled in the housing can be discharged to the outside through the gap of the welded portion described above, and the amount of the inert gas As air is introduced into the housing, oxidation may occur inside the housing during welding.

Accordingly, the inert gas filling step (S200) of the present invention may further include a housing internal sound pressure forming step (S230) for generating a negative pressure inside the housing by the inert gas.

Referring to FIG. 8, the arc welding step S300 may include a chamber internal sound pressure forming step S310 and a welding part welding step S320.

As described above, the reason why the inside of the housing is evacuated and then the inert gas is filled is to prevent the oxygen outside the housing, that is, the oxygen existing inside the chamber of the welding apparatus, from flowing into the inside of the housing.

Therefore, if oxygen present in the interior of the housing, the periphery of the weld, as well as the inside of the chamber of the welding apparatus is removed, oxidation of the weld in the arc welding can be fundamentally blocked.

If a negative pressure is formed in the inside of the housing in the inert gas filling step (S200), negative pressure is formed using the inert gas inside the chamber (S310) in the arc welding step S300 (S310) Arc welding to the welded portion can be performed (S320).

At this time, when the pressure inside the chamber is lower than the pressure inside the housing, the inert gas inside the housing is discharged to the chamber. As described above, a small amount of oxygen remaining in the chamber can not be discharged to the outside due to the internal structure or shape of the chamber There is a possibility that the inert gas is introduced into the exhausted housing.

Therefore, in the present invention, it is preferable that the pressure inside the chamber is adjusted between the atmospheric pressure and the pressure inside the housing in the process of forming the negative pressure inside the arc welding chamber in the arc welding step (S300).

Of course, in the case where the negative pressure formed inside the housing and the chamber is large, air including oxygen may be introduced from the outside although the inert gas is filled therein, so that the negative pressure in each step is such that the gas is moved by the pressure difference It is natural that it is formed as a minimum pressure difference.

On the other hand, the temperature at which oxidation is activated in the arc welding in an inert gas atmosphere is about 500 ° C to 600 ° C, and the welding temperature in arc welding is about 1000 ° C.

Therefore, oxidation by arc welding can occur during the process of lowering the temperature after welding.

Referring to FIG. 9, when the welding is started, the temperature of the welding portion rises above the minimum welding temperature T1, and is lowered (solid line in FIG. 9) when welding is completed.

In the arc welding step S300 of the present invention, as shown in FIG. 8, in order to pass through the zones T2 to T3 during which oxidation is actively generated in the shortest time, (S330).

As a result, it is possible to minimize the occurrence of oxidation by significantly reducing the passage time of the oxidation-occurring sections T2 to T3 from? T2 to? T1.

Therefore, according to the present invention, it is possible to prevent oxygen from remaining in the interior of the housing and the chamber and around the welded portion by each step and processes shown in FIG. 8, and at the same time, In addition, by minimizing the amount of water, it is possible to prevent contamination of the drinking water due to oxidation occurring in the manufacturing process of the water tank for storing the drinking water.

Hereinafter, a welding apparatus capable of manufacturing a water tank for a water purifier by the above-described method will be described.

FIG. 10 is a configuration view showing an embodiment of a water tank welding apparatus for a water purifier including a welding piping earth zone according to the present invention.

Referring to FIG. 10, a water purifier tank welding apparatus 200 including a welding piping discharge zone includes a chamber 210, a first jig 220, a second jig 230, a moving module 240, An arc furnace region 100 and a welding torch 260.

The chamber 210 is for sealing the water tank for the water purifier and has an internal space configured to be hermetically sealed. On one side of the chamber 210, a control unit 211 for controlling the devices in the chamber 210 and a door 212 for welding Lt; / RTI >

The first jig 220 is formed inside the chamber 210 to support the upper case 310 of the housing 300 for the water tank and is provided with a fixing pad 221, and a rotation motor 222 for rotating the upper case 310 during welding.

The second jig 230 is configured to face the first jig 220 and supports the lower case 320 of the housing 300 for the water tank. 231 and a rotation motor 232. [

The moving module 240 is provided to abut the welded portions of the upper case 310 and the lower case 320 supported by the first and second jigs 220 and 230. The first and second jigs 220 and 230, Two or more of the two jigs 230 can be moved. In FIGS. 10 and 14, the movement of the second jig 230 will be described as an example.

The welding piping earth 100 is configured to surround a welded portion to be welded in a state in which the upper case 310 and the lower case 320 are in close contact with each other and is filled with an inert gas and the upper case 310 and the lower case 320 320 corresponding to the outer shape of the housing 300.

1 to 6, in the case where the cooling nozzle 210 to be described later is provided in the welding apparatus 200 And a nozzle inserting portion is further formed in the welding flux drawing zone 100 so that the cooling nozzle 210 is inserted. Hereinafter, a detailed description of the welding piping drawing zone 100 will be omitted.

The welding torch 260 is inserted into the welding piping 100 in a state in which the upper case 310 and the lower case 320 are in close contact with each other and arc welded to the welding part. Argon), pipes for supplying the tanks, and the like can be applied variously according to the requirements of those skilled in the art, so that the present invention is not limited thereto.

In addition, since the present invention has a technical feature in a method of operating the apparatus instead of the detailed configuration of each apparatus, it goes without saying that the conditions such as the constraint of the configuration such as the welding torch 260 are the same or similar to other configurations.

8, the welding apparatus 200 of the present invention includes a cooling nozzle 210, a nitrogen supply module 250, a housing vacuum pump 280, and a chamber (not shown) so as to prevent oxidation from occurring, The vacuum pump 290 can be further configured.

The cooling nozzles 210 are for rapid cooling of hot welds welded by the welding torch 260 and may be inserted into the welding torch arc 100 described above and configured adjacent to the welding torch 260 . For example, when the upper case 310 and the lower case 320 are welded while being pivoted by the pivotal motors 222 and 232 in one direction, the cooling nozzle 210 is moved to the other side with respect to the welding torch 260 Lt; / RTI >

The nitrogen supply module 250 supplies nitrogen as an inert gas to the interior of the housing 300 constituted by the upper case 310 and the lower case 320. The nitrogen supplying module 250 includes a first jig 220 or a second jig 230 To supply nitrogen through the upper case 310 or the lower case 320 to the inside.

The vacuum pump 280 for housing may be formed separately from the nitrogen supply module 250 as shown in FIG. 10, but it is not limited thereto and may be formed in accordance with the needs of a person skilled in the art It is a matter of course that vacuum formation and nitrogen supply are possible by using one apparatus.

The chamber vacuum pump 290 is used to vacuum the interior of the chamber 210 when the internal space of the chamber 210 is sealed to weld the housing 300. In Figure 10, However, it is possible to vacuumize the inside of both the housing 300 and the chamber 210 by using a single vacuum pump according to the needs of a person skilled in the art, and the position thereof is not limited to the inside of the chamber 210 as well.

Finally, the control unit 211 configured in the chamber 210 includes rotation motors 222 and 232, a moving module 240, a nitrogen supply unit 250, a welding torch 260, a cooling nozzle (not shown) The vacuum pump for housing 280 and the vacuum pump for chamber 290 are electrically connected to each other (thin solid line in FIG. 10) so as to control the operation of each of the components. Thus, by the welding method shown in FIG. 7 or 8, 10, welding may be performed on the welded portion of the case 310 and the lower case 320, and may be formed as a panel on one side of the chamber 210 as shown in FIG. 10, Lt; / RTI >

11 to 14 are views for explaining the process of welding a water tank according to FIG.

The upper case 310 and the lower case 320 of the housing 300 to be welded are connected to the first jig 220 and the second jig 230 through the door 212 of the chamber 210, And the door 212 is closed so that the inside of the chamber 210 can be sealed.

12, when the second jig 230 is moved by the movement module 240, the welds of the upper case 310 and the lower case 320 may be in close contact with each other.

When the welded portions of the upper case 310 and the lower case 320 come into close contact with each other, the inside of the upper case 310 and the lower case 320 is evacuated by the vacuum pump 280 for housing, Lt; RTI ID = 0.0 > nitrogen. ≪ / RTI >

The control unit 211 may control the nitrogen supply module 250 so that the inside of the upper case 310 and the lower case 320 may receive a negative pressure and the inside of the upper case 310 and the lower case 320, Since the pressure sensor and the measuring method for measuring the pressure can be variously applied to the needs of those skilled in the art, it is of course not limited to a specific one.

The control unit 210 controls the chamber vacuum pump 290 so that a negative pressure is formed on the basis of the atmospheric pressure inside the chamber 210 and controls the vacuum pump 280 for housing to control the inside of the housing 300 A negative pressure may be formed on the basis of the atmospheric pressure inside the chamber 210.

13, the welding torch 260 approaches the welded portion and the first jig 220 and the second jig 230 are rotated by the rotation motors 222 and 232 so that the upper case 310 And the welding of the lower case 320 can be performed.

At this time, as shown in FIG. 8, the welded portion that has been welded may be cooled by the cooling nozzle 210, and the coolant for cooling the welded portion may be a low temperature (higher temperature than the liquefying temperature) inert gas (for example, -5 Deg.] C to -20 [deg.] C), and it is preferable to avoid the use of a cryogenic inert gas in order to prevent cracks or the like from occurring in the welded portion due to a rapid temperature change.

When the welding of the upper case 310 and the lower case 320 is completed by the above process, the moving module 240 moves the second jig 230 to its original position, and the user moves the door 212 The housing 300 can be recovered.

At this time, the rotation motors 222 and 232 can rotate the first jig 220 and the second jig 230 in an opposite direction to the rotating direction during welding, return to the original position, and the welding torch 260 and the cooling nozzle 210) It is also possible to move to the original position.

Therefore, in the process of welding the water tank for drinking water storing water for drinking water, oxidation is not generated on the outside as well as the inside of the housing 300, so that users can drink drinking water safely when using the water purifier .

The welding method and the welding apparatus according to the present invention can be applied not only to a water tank in which various structural changes are possible but also to various electronic products, It can also be used in buildings, etc.

The method and apparatus for water tank for water purifier for preventing oxidation of the inside of the welded portion according to the present invention have been described. It will be understood by those skilled in the art that the technical features of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is to be understood, therefore, that the embodiments described above are in all respects illustrative and not restrictive.

100: Welding Busan Hwabang District
110: anti-oxidation body 111:
112: gas supply unit 113: gas discharge unit
120: Isolation cover 121:
122: guide groove 123: second elastic member
124: elastic support member 125: third elastic member
126:
131: linear close cover 132: first elastic member
133: close cover guide
200: welding device
210: Chamber 211:
220: first jig 230: second jig
240: transfer module 250: nitrogen supply module
260: welding torch 270: cooling nozzle
280: Vacuum pump for housing 290: Vacuum pump for chamber
300: housing
310: upper case 320: lower case

Claims (10)

An anti-oxidation body in which a welding torch for arc welding of a welding base material is inserted and an inert gas is filled in the arc welding; And
And an isolation cover which is spatially connected to the oxidation preventing body and is formed to have a corresponding outer shape corresponding to the outer shape of the welding base material so as to surround the welding portion.
The method according to claim 1,
The anti-
A torch inserting portion for inserting a welding torch for arc welding the welding portion;
At least one gas supply unit to which the inert gas is supplied; And
And at least one gas discharging portion through which at least a part of the inert gas is discharged,
Wherein the isolation cover
Wherein a guide groove is formed to correspond to the welded portion.
3. The method according to claim 1 or 2,
A linear close cover moved so as to be able to open and close the outer shape correspondingly adhering portion; And
And a first elastic body for applying an elastic force to the linear close cover to press the linear close cover toward the outer shape corresponding tight contact portion,
When the outer shape of the welding base material is changed from a straight line portion to a curved portion at the time of arc welding, the linear close cover is moved upward to the anti-oxidation main body side, and the external shape corresponding portion of the isolation cover is brought into close contact with the welding base material Welding Busan Hwajeon District.
The method of claim 3,
And at least one close cover guide for guiding movement of the linear close cover,
The linearly-
And is moved toward the anti-oxidation main body side or the outer shape corresponding tight contact side along the close cover guide.
3. The method according to claim 1 or 2,
The outer shape correspondingly-
And a second elastic body whose shape is changed by an elastic force,
Wherein the isolation cover
And a contour corresponding shrinkage portion formed to be contractible to the anti-oxidation main body side in response to deformation of the second elastic body,
Wherein when the outer shape of the welding base material is changed from a straight line portion to a curved portion at the time of arc welding, the outer shape correspondingly adhered portion is bent to the side of the oxidation preventing main body and is brought into close contact with the welding base material.
6. The method of claim 5,
Wherein the isolation cover
Further comprising a crack preventing portion which is brought into close contact with the welding base material during arc welding to prevent a crack caused by the second elastic body.
A chamber configured to seal the internal space;
A jig provided inside the chamber for supporting the upper case and the lower case of the housing for the water tank;
A moving module for moving the jig to bring the welded portions of the upper case and the lower case into contact with each other;
A welding piping surrounding the welding portion and filled with an inert gas and having an external shape corresponding to the external shape of the water tank housing; And
And a welding torch for arc-welding a welded portion of the upper case and the lower case, which are inserted into the welded busbars and are in close contact with each other.
8. The method of claim 7,
And a cooling nozzle for rapidly cooling the welded portion welded by the welding torch,
Wherein the welded bushed zone comprises:
And a nozzle insertion portion into which the cooling nozzle is inserted.
8. The method of claim 7,
Wherein the welded bushed zone comprises:
Wherein the outer shape corresponding adhering portion is closely contacted with the curved surface or the planar shape of the water tank housing to isolate the welded portion.
10. The method according to any one of claims 7 to 9,
And a nitrogen supply module for supplying nitrogen to the inside of the water tank housing when the welded portions of the upper case and the lower case come into close contact with each other,
Wherein the inside of the housing and the outside of the housing are formed in an inert gas atmosphere through the nitrogen multiplying module and the welding oxidation resistant region to weld the welding portion of the housing to the water tank for water purifier .

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