KR102398486B1 - Installation apparatus for purge dam using purge paper - Google Patents

Abstract

One objective of the present invention is to inject an inert gas during tube welding by installing purge dams on the front and rear of a welded portion and then seal the same. The present invention relates to a purge dam installation device which comprises: a guide tube having a cylinder inserted toward the inside of the tube and deformed to be in close contact with an inner surface of the tube, and having a tube body extending from one end of the cylinder; an attachment pad formed in a cylindrical ring shape and installed to surround and support an outer surface of the cylinder; and a connecting bar installed to be movable in both forward and backward directions inside the guide tube. The purge dam installation device deforms the purge paper mounted inside the tube to correspond to the shape of the inner surface of the tube.

Description

Purge dam installation device using purge paper {INSTALLATION APPARATUS FOR PURGE DAM USING PURGE PAPER}

The present invention relates to an apparatus for installing a purge dam used in tube welding.

The energy source of the turbine for driving the generator is generally supplied from the boiler. The boiler may include a tube (or pipe) for heat exchange such as a water cooling wall and a superheater in order to convert thermal energy supplied from fossil fuel or a heat source into steam energy.

Here, the heat exchange tube may be damaged by overheating by high-temperature and high-pressure steam, or may be worn or damaged by wear particles contained in combustion gas, and the damaged tube requires partial replacement or full replacement, and welding work is essential.

At this time, for the tube made of a metal material containing chromium (Cr), a purge dam is installed on the inner surface of the tube to prevent oxidation of chromium (Cr), and after filling inert gas (inert gas), welding operation It is possible to secure quality according to tube repair, etc.

The operation of installing a purge dam at the front and rear ends of the welding area and replacing the air containing oxygen with the injection of an inert gas is called purging. Purging is an operation in which a purge dam is installed at the front and rear ends of a welding area for welding a tube made of a corrosion-resistant material such as stainless steel or titanium, and then the area to be welded is sealed and the gas in the enclosed space is replaced with an inert gas. If a purge dam is not used during welding, there may be a problem in that the welding quality is deteriorated due to the mixing of foreign substances and poor penetration due to oxidation of the welding part.

The purge dam serves to prevent leakage of the purge gas supplied to the tube or tube, which is manufactured using purge paper. Purge paper is a special paper made of natural pulp material so that it is easily soluble in water, and the purge dam can be dissolved and removed naturally by supplying boiler water without a separate removal process after welding.

In the prior art, it was common to form a purge dam in such a way that an operator properly cuts the purge paper and then pushes it into the tube by hand. However, if the purge paper is pushed into the tube, it may be crumpled without a special shape and the purge paper may be clumped or used excessively. Doing so may cause problems such as poor water flow.

One object of the present invention is to seal the tube after injecting an inert gas during tube welding by installing a purge dam at the front and rear of the welding site.

Another object of the present invention is to secure operator convenience by more easily installing a purge dam inside a tube during tube welding.

Another object of the present invention is to minimize the use of purge paper for the formation of a purge dam to prevent a problem of obstructing the flow of fluid in a tube in advance, and to prevent economic degradation due to excessive use of purge paper.

In order to achieve one object of the present invention, a purge dam installation device according to an embodiment of the present invention includes a cylinder that is inserted toward the inside of a tube and deformed to be in close contact with the inner surface of the tube, and extends from one end of the cylinder. a guide tube having a tube body formed thereon; an attachment pad formed in a cylindrical ring shape and installed to surround and support the outer surface of the cylinder; and a connecting bar installed to be movable in both front and rear directions inside the guide tube, wherein the cylinder expands in a radial direction by manipulating the connecting bar, and removes the purge paper mounted in the tube inside the tube. deformed to correspond to the shape of the side surface, and the attachment pad is formed by being separated into a plurality of parts so as to be deformable corresponding to the radial extension of the cylinder, and the inner surface of the tube when the cylinder is radially unfolded It may be formed of a material having elasticity to form the purge paper in close contact with it.

According to an example of the present invention, a depression of a certain depth may be formed on the outer surface of the cylinder. In this case, the depression may be formed at a plurality of locations on the outer surface of the cylinder.

According to an example of the present invention, a coupling portion is formed to protrude from the inner surface of the attachment pad, and may be fitted to the recessed portion to be coupled thereto.

According to an example of the present invention, the recessed portion may have a cross section of a tapered shape toward the outside of the radius, and the coupling portion may have a tapered shape to correspond to the shape of the recessed portion.

According to an example of the present invention, a receiving portion recessed to a predetermined depth in a radial direction may be formed on the outer surface of the attachment pad.

According to an example of the present invention, a ring-shaped spring is mounted on the receiving part, and the spring may be configured to provide an elastic force to resist the shape deformation of the cylinder.

According to an embodiment of the present invention, the connecting bar is made of a shape tapered in one direction, the wedge portion is installed to be in contact with the inner surface of the cylinder to form an external force in the radial direction to the cylinder; a support portion formed in the shape of a bar extending in one direction; And it may be made to include a grip portion formed in a ring shape at one end of the support portion.

According to an example of the present invention, an inclined surface is formed on the inner surface of the cylinder to be inclined in the extending direction of the tube, and the wedge portion may be slid along the inclined surface. In this case, the cylinder may be deformed to spread in a radial direction while moving relative to the wedge portion.

According to an example of the present invention, the cylinder is made of a plurality of parts by a cutout cut in the extension direction of the tube, and each of the parts can be deformed away from each other along the cutout in response to the movement of the wedge. there is.

In the purge dam installation device having the above structure, the purge dam can be conveniently installed inside the front and rear tubes of the welding site, thereby preventing the outflow of the inert gas injected during tube welding.

In addition, by using the purge dam installation device, the purge paper located at the inlet side of the tube is pushed into the tube and the cylinder is deformed to spread toward the inner surface of the tube using a connecting bar, thereby simplifying the purging operation for tube welding. It is possible to secure the work convenience of the operator.

In addition, unlike the conventional method, it is possible to seal the inert gas injected into the tube while minimizing the use of purge paper for the formation of the purge dam, so that the passage of the tube may not be disturbed, and economic feasibility due to the minimization of the use of the purge paper will be able to promote

1 is a conceptual diagram illustrating a state in which a purge dam is installed inside a tube.
2 is a conceptual diagram illustrating a state in which a purge dam is installed inside a tube using a purge dam installation device.
3 is a conceptual diagram showing a state of the purge dam installation apparatus according to the present embodiment.
4 is a side view of the purge dam installation device of FIG. 3 .
5 is a conceptual diagram showing a state of a guide tube constituting a purge dam installation device.
6 is an enlarged view showing the rear portion of the purge dam installation device when the purge dam is installed.
7A is a view showing a purge dam manufactured through purge paper.
7B is a view showing a state of a purge dam installed inside the tube.

Hereinafter, the purge dam installation device according to the present invention will be described in more detail with reference to the drawings.

In the present specification, the same and similar reference numerals are assigned to the same and similar components in different embodiments, and a redundant description thereof will be omitted.

Also, a structure applied to one embodiment may be equally applied to another embodiment as long as there is no structural and functional contradiction in the different embodiments.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted.

The accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

In the following detailed description of the invention, it can be understood that the front or front part means the right side in the drawing, and the rear or rear part means the left side in the drawing. In addition, upper or upper side may be understood to mean an upper side in a vertical direction in the drawing, and a lower or lower side may be understood to mean a lower side in the vertical direction in the drawing.

1 shows a state in which the purge dam 12 is installed inside the tube 10 .

The tube 10 of the boiler may be damaged due to overheating operation or by foreign substances contained in the exhaust gas. In this case, the operator replaces the damaged part by replacing the single tube. In particular, in the welding process for partially replacing the tube 10 made of a metal material containing chromium (Cr), the purge dam 12 made of the purge paper 11 so that the oxidation of chromium (Cr) can be prevented. is mounted on the inside of the tube 10, and the inert gas is injected to remove the oxidizing gas inside the space divided by the purge dam 12 in the tube 10 is performed after the purging operation is performed. A pipe other than the tube 10 may be a target of installation of the purge dam 12 by the purge dam installation apparatus 100 according to an embodiment of the present invention, and may be a target of welding.

The purge dam 12 is manufactured by molding the purge paper 11, and after the purge operation is performed, the purge dam 12 is a welding portion 10a formed at a predetermined position not to be damaged by the welding heat of the tube 10. ) can be located adjacent to When the operator performs a welding operation for replacing a portion of the tube 10 (single tube replacement), the front and rear portions of the welding required portion 10a of the tube (meaning the left and right sides in the drawing in FIG. 1 ). A plurality of purge dams 12 are installed there.

The purge dam 12 may be respectively installed inside the boundary portion (not shown) of the existing tube except for a portion requiring replacement of a single tube. As shown in FIG. 1, the purge dam 12 may be disposed in a shape opposite to each other by being installed inside the existing tubes located on both sides of the part where the single pipe replacement is required, and through this, the purge gas composed of an inert gas It will be possible to secure the quality of welding by injecting into the inside of the tube 10 and performing a welding operation in a sealed state.

In addition, at least one or more purge dams 12 manufactured using the purge paper 11 may be installed inside the tube 10 , and each purge dam 12 purifies the inside of the tube 10 . Accordingly, they may be disposed to be spaced apart from each other by a predetermined interval.

2 shows a state in which the purge dam 12 is installed in the tube 10 using the purge dam installation device 100 .

The purge dam 12 is manufactured by molding the purge paper 11 , and the purge dam 12 can be easily installed inside the tube 10 through the purge dam installation device 100 according to this embodiment. do. The purge dam installation device 100 not only enables sealing of the inert gas injected during the welding process without using the purge paper 11 excessively, but also easily puts the molded purge paper 11 inside the tube 10 . can be installed. In addition, it is possible to prevent overuse of the expensive purge paper 11 and prevent the tube 10 from being damaged by overheating due to poor water flow due to the remaining purge dam 12 during operation of the boiler.

The purge dam installation apparatus 100 may include a guide tube 110 , an attachment pad 120 , and a connection bar 130 as a configuration to install the purge dam 12 inside the tube 10 .

In order to install the purge dam 12 on the inside of the tube 10 , first, the operator removes the part to be replaced with a single pipe that needs replacement because the tube 10 is damaged and faces the inside of the remaining existing tube 10 . The purge paper 11 cut into a circular shape is positioned. In this case, the purge paper 11 will be spanned toward the inlet end of the opened tube 10 .

When the purge paper 11 is positioned at the inlet of the tube 10 , the operator uses the purge dam installation device 100 to purge the purge paper 11 by pushing the purge paper 11 toward the inside of the tube 10 . The dam 12 can be formed inside the tube 10 .

When the purge paper 11 is pushed toward the inside of the tube 10 , the purge paper 11 is naturally formed while being pushed into the tube 10 by the purge dam installation device 100 to form the purge dam 12 . By manipulating the connecting bar 130 to form the movement of the cylinder 111 , the purge dam 12 is easily formed to seal the inside of the tube 10 .

3 and 4 show the appearance of the purge dam installation apparatus 100 according to the present embodiment. In addition, FIG. 5 shows a state of the guide tube 110 constituting the purge dam installation apparatus 100 .

The purge dam installation device 100 is to simplify the installation of the purge dam 12 inside the tube 10 , and may include a guide tube 110 , an attachment pad 120 , and a connection bar 130 .

After the operator pushes the purge paper 11 positioned at the inlet of the tube 10 that is opened while holding the guide tube 110 and the connecting bar 130 together toward the inside of the tube, the connecting bar 130 ) to change the shape of the cylinder 111 , the purge paper 11 mounted on the inside of the tube 10 can be brought into close contact with the inner surface of the tube 10 .

When the operator pulls toward the front (right side in FIG. 3) while holding the connection bar 130 positioned inside the guide tube 110, the cylinder 111 moves toward the inner surface of the tube 10. Its shape can be deformed so as to be unfolded. In this case, the purge paper 11 mounted on the inside of the tube 10 is in close contact with the inner surface of the tube 10 and the periphery is on the inner surface of the tube 10 . It is possible to seal the inside of the tube 10 while being folded to fit.

The guide tube 110 is inserted toward the inside of the tube 10 , and it is inserted toward the tube 10 opened for replacement of a single tube and serves to push the purge paper 11 mounted on the inside of the tube 10 . do

The connecting bar 130 may be accommodated inside the guide tube 110 , and the guide tube 110 is inserted toward the inside of the tube 10 , and the cylinder 111 is deformed in close contact with the inner surface of the tube 10 . ) and may include a tube body 112 extending in one direction from the end of the cylinder 111 .

The tube body 112 is connected to the cylinder 111, so that there is no restriction when expanding in the radial direction (outer diameter) of the cylinder 111, in the same manner as the cylinder 111, along the cutout 111c to a predetermined position. It may consist of a plurality of cut-out parts. For example, the tube body 112 may be divided into three along the longitudinal direction at intervals of 120 degrees so that the cylinder 111 is the same as the divided number, and the tube body 112 in consideration of the production process or manufacturing cost. It will also be possible to divide into 4 or 5.

The gripping part accommodating part 113 is connected to the tube body 112 , and the gripping part accommodating part 113 may be formed in the front part of the tube body 112 . The gripping part 131 may be positioned inside the gripping part accommodating part 113 , and may be formed to have a certain curvature so that an operator can hold the gripper 131 and facilitate operation. In addition, a groove (not shown) for limiting movement may be formed on the inside of the gripper receiving portion 113 to limit equipment damage due to excessive movement of the wedge portion 133 .

The cylinder 111 is formed in the rear portion of the guide tube 110 and may be connected to the tube body 112 . The cylinder 111 may be deformed to spread toward the inner surface of the tube 10 by manipulation of the connecting bar 130 . The cylinder 111 serves to provide an external force so that the purge paper 11 positioned inside the tube 10 is molded while being deformed to expand radially inside the tube 10 .

The attachment pad 120 is installed on the outer surface of the cylinder 111 , and the cylinder 111 serves to provide an expanding force so that the purge dam 12 can be seated on the inner surface of the tube 10 . The cylinder 111 may be composed of a plurality of parts cut by the cutout 111c formed along the extension direction of the tube 10 , and each part corresponds to the movement of the connecting bar 130 to the tube 10 . It can be spread out in the direction away from each other with respect to the center of the .

The cylinder 111 may be made of a metal material (eg, aluminum) or plastic, and may be formed of a plurality of parts cut by the cutout 111c to be deformed in a radial direction. For example, the cylinder 111 may be made to be equally divided at intervals of 120 degrees in the same way as the tube body 112, and may be divided in the longitudinal direction. Through this, the cylinder 111 may be radially expanded as the tapered wedge portion 133 of the connecting bar 130 equally divided at intervals of 120 degrees moves toward the front portion, and the elastic force by the spring ring can be restored by

In addition, an inclined surface is formed on the inner surface of the cylinder 111 to be inclined in the extending direction of the tube 10 , and the wedge 133 formed on the connecting bar 130 slides along the inclined surface to the radius of the cylinder 111 . It is possible to form a deformation in the direction.

A depression 111a of a certain depth may be formed on the outer surface of the cylinder 111, and the coupling portion 121 formed on the attachment pad 120 is fitted into the depression 111a, so that the cylinder 111 and the attachment pad ( 120) to form a bonding force. The recessed part 111a may have a cross section of a tapered shape going outward, and the coupling part 121 inserted therein also has a tapered shape, after the coupling part 121 is inserted into the recessed part 111a. It can not easily come out to the outside.

The attachment pad 120 may have a cylindrical ring shape and may be installed to surround and support the outer surface of the cylinder 111 . The attachment pad 120 is in close contact with the inner surface of the tube 10 to form the purge paper 11 to form the side surface 12b of the purge dam 12 .

The attachment pad 120 may be manufactured using a urethane or rubber material having elasticity so that the purge dam 12 can be easily installed inside the tube 10 , and the cylinder 111 expands and deforms in the radial direction. It may be separated into a plurality of parts and seated on the cylinder 111 so as to be deformed correspondingly.

The attachment pad 120 may be manufactured in various thicknesses so as to be installed on the outer surface of the cylinder 111 in consideration of the inner diameter of the tube 10 on which the purge dam 12 is installed. The attachment pad 120 may be formed of a plurality of parts corresponding to the parts constituting the cylinder 111 . For example, when the cylinder 111 is composed of three parts, the attachment pad 120 is also thereto. Correspondingly, it may consist of three parts.

A coupling portion 121 is formed to protrude from an inner surface of the attachment pad 120 in an inner direction, and may be installed to be fitted on the outer surface of the cylinder 111 . The coupling part 121 may be positioned to fit into the recessed part 111a formed on the outer surface of the cylinder 111 . The coupling part 121 serves to limit the detachment of the attachment pad 120 into the tube 10 when the purge dam 12 is installed, and may be formed of at least one or more.

In addition, a receiving portion 122 that is recessed to a predetermined depth in a radial direction may be formed on the outer surface of the attachment pad 120 . The receiving portion 122 may be formed in a round groove shape, and a ring-shaped spring 140 may be mounted on the receiving portion 122 to provide an elastic force to resist shape deformation of the cylinder 111 . The spring 140 is made of a metal material, and serves to restore the cylinder 111 expanded by the movement of the wedge 133 to its original state, and the operator will be able to select various tensions and specifications.

At least one or more accommodating portions 122 may be formed along the outer surface of the attachment pad 120 .

The connecting bar 130 is installed inside the guide tube 110 , and may be positioned to penetrate the center of the cylinder 111 . The connecting bar 130 is movable in both front and rear directions (left or right in the drawing), and may include a holding part 131 , a wedge part 133 , and a support part 132 .

The wedge 133 may have a tapered shape in one direction, and may be installed to be in contact with the inner surface of the cylinder 111 . The wedge 133 may have a diameter that decreases from the rear portion toward the front portion.

On the outer surface of the wedge 133 , a wedge contacting surface 133a may be formed to be inclined forward to correspond to the inclined surface 111b of the cylinder 111 . When the operator forms the movement of the connecting bar 130 , the wedge contact surface 133a slides along the inclined surface 111b of the cylinder 111 to provide an external force in the radial direction to the cylinder 111 . . The wedge 133 and the cylinder 111 may move relative to each other along the inclined surface 111b.

Since an inclined surface is formed on the inner surface of the cylinder 111 so as to be inclined in the extending direction of the tube 10, the wedge 133 can be slid along the inclined surface to form a radial deformation of the cylinder 111. .

The support part 132 may be formed in the shape of a bar extending in one direction, and may be located inside the tube body 112 .

In addition, a separate spring (not shown) is installed inside the support part 132 to smoothly move the wedge part 133 to the outside of the tube 10 after the purge dam 12 is installed inside the tube 10 . There will be.

The grip part 131 may be connected to one end of the support part 132 and be formed in a ring shape so that an operator can grip it.

6 is an enlarged view showing a rear portion of the purge dam installation device 100 when the purge dam 12 is installed.

As described above, the cylinder 111 may be made of a plurality of parts cut along the cutout 111c, and each part moves away from each other with respect to the center of the tube in response to the movement of the wedge 133. can move

That is, the cylinder 111 may be deformed to unfold toward the inner surface of the tube 10 by manipulation of the connecting bar 130 . The cylinder 111 is deformed to expand radially inside the tube 10 , so that the purge paper 11 mounted on the inside of the tube 10 can be deformed to correspond to the shape of the inner surface of the tube 10 . do.

When the operator pulls toward the front (right direction in FIG. 6) while holding the connection bar 130 positioned inside the guide tube 110, the cylinder 111 is directed toward the inner surface of the tube 10. direction, and in this case, the purge paper 11 mounted on the inside of the tube 10 is in close contact with the inner surface of the tube 10 and the periphery is deformed to be folded to fit the inner surface of the tube. The inside of the tube 10 may be sealed. In addition, in order to increase the adhesion of the molded purge paper 11 to the inner surface of the tube 10, an adhesive such as solid glue may be used.

FIG. 7A is a diagram showing the purge dam 12 manufactured through the purge paper 11, and FIG. 7B shows the inside of the tube 10 in which the purge dam 12 is installed.

When the operator pulls the connecting bar 130 positioned inside the guide tube 110 to the front (the right direction in FIG. 6 ) in a state of gripping it, the cylinder 111 is directed toward the inner surface of the tube 10 . It can be deformed to be spread out, and through this, the purge paper 11 is molded to form the first surface 12a forming the side surface of the purge dam 12 and the second surface 12b forming the front surface, respectively. do.

The operator can form the purge dam 12 inside the tube 10 by simply pushing the purge paper 11 toward the inside of the tube 10 by using the purge dam installation device 100, By forming the purge dam 12 by the movement of the cylinder 111, it is possible to seal the inside of the tube 10. In this case, it is possible to minimize overlapping or aggregation of the first surface 12a of the purge dam 12 .

Through this, it is possible not to use the purge paper 11 excessively to block the leakage of the purge gas, so that the purge paper 11 does not dissolve in water after welding maintenance, thereby preventing the boiler tube from being damaged by overheating. In addition, it is possible to easily and quickly install a plurality of purge dams 12 inside the tube 10, thereby reducing the work required.

What has been described above is merely embodiments for implementing the purge dam installation device according to the present invention, and the present invention is not limited to the above embodiments, and does not depart from the gist of the present invention as claimed in the claims below. It will be said that the technical spirit of the present invention exists to the extent that various modifications can be made by anyone with ordinary knowledge in the field to which the invention pertains within the scope not included.

10: tube
10a: weld
11: Purge Paper
12: purge dam
100: purge dam installation device
110: guide tube
111: cylinder
112: tube body
113: grip portion receiving unit
120: attachment pad
121: coupling part
122: receptacle
130: connection bar
131: grip part
132: support
133: wedge
140: ring-shaped spring

Claims (11)

a guide tube having a cylinder inserted toward the inside of the tube and deformed to be in close contact with the inner surface of the tube, and a tube body extending from one end of the cylinder;
an attachment pad formed in a cylindrical ring shape and installed to surround and support the outer surface of the cylinder; and
and a connecting bar installed to be movable in both front and rear directions inside the guide tube,
The cylinder is expanded in a radial direction by manipulation of the connecting bar, and the purge paper mounted on the inside of the tube is deformed to correspond to the shape of the inner surface of the tube,
The attachment pad is formed by being separated into a plurality of parts so as to be deformable in response to radial expansion of the cylinder, and is in close contact with the inner surface of the tube when the cylinder is radially expanded to form the purge paper A purge dam installation device, characterized in that it is formed of a material having elasticity to do so.
According to claim 1,
A purge dam installation device, characterized in that a depression is formed on the outer surface of the cylinder
3. The method of claim 2,
The purge dam installation device, characterized in that the depression is formed in a plurality of places on the outer surface of the cylinder.
3. The method of claim 2,
A purge dam installation device, characterized in that a coupling portion is formed to protrude from the inner surface of the attachment pad, and is fitted and coupled to the recessed portion.
5. The method of claim 4,
The recessed portion has a cross section of a tapered shape toward the outside of the radius,
The coupling portion, the purge dam installation device having a tapered shape to correspond to the shape of the recessed portion.
5. The method of claim 4,
A purge dam installation device, characterized in that a receiving portion recessed in a radial direction is formed on the outer surface of the attachment pad.
7. The method of claim 6,
A ring-shaped spring is mounted on the accommodating part, and the spring is a purge dam installation device, characterized in that it provides an elastic force to resist the shape deformation of the cylinder.
The method of claim 1,
The connecting bar is
a wedge portion tapered in one direction and installed to be in contact with an inner surface of the cylinder to form an external force in a radial direction on the cylinder;
a support portion formed in the shape of a bar extending in one direction; and
A purge dam installation device comprising a grip portion formed in a ring shape at one end of the support portion.
9. The method of claim 8,
An inclined surface is formed on the inner surface of the cylinder to be inclined in an extension direction of the tube, and the wedge portion is slid along the inclined surface.
10. The method of claim 9,
The cylinder is a purge dam installation device, characterized in that it is deformed to expand in a radial direction while moving relative to the wedge.
10. The method of claim 9,
The cylinder is made of a plurality of parts by an incision cut in the extension direction of the tube,
The purge dam installation device, characterized in that the respective parts are deformed away from each other along the cutout in response to the movement of the wedge.

Images