KR101891444B1 - Bundle type heat exchanger module with high corrosion resistance by nickel plating and Method of manufacturing - Google Patents

Abstract

The present invention relates to a bundle type plate-shaped heat exchanger module having a high corrosion resistance through nickel plating, which is suitable for seawater due to an excellent corrosion resistance through electroplating, and a method for manufacturing the same, and the present invention suggests a bundle type plate-shaped heat exchanger module having a high corrosion resistance through nickel plating, and a method for manufacturing a bundle type plate-shaped heat exchanger module, the method including: a first step of forming a heating or heated heat conduction passage on a surface of a metal plate having a specific unit area and forming a port hole at a periphery of the heat conduction passage to make a heat conduction plate; and a second step of introducing a filler metal between the heat conduction plates and blazing the heat conduction plates to make an integral plate-shaped heat exchanger module. The plate-shaped heat exchanger module is formed thorough a fourth step of connecting a negative (-) electrode to the plate-shaped heat exchanger module, immersing the plate-shaped heat exchanger module in an electrolyte of a plating vessel such that the electrolyte penetrates into the plate-shaped heat exchanger uniformly, and applying a voltage to the plating vessel in a state in which a nickel (Ni) anode, to which a positive (+) electrode is connected, is introduced into the plating vessel to electroplate the entire plate-shaped heat exchanger module; and extracting the plate-shaped heat exchanger module from the plating vessel and washing and drying the plate-shaped heat exchanger module.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bundle type heat exchanger module having high corrosion resistance by nickel plating and a method of manufacturing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bundle type heat exchange module having high corrosion resistance by nickel plating and more particularly to a manufacturing method of a bundle type plate heat exchange module having excellent corrosion resistance by electrolytic plating and high corrosion resistance by nickel plating suitable for seawater , And a bundle type plate heat exchange module having high corrosion resistance by the nickel plating produced thereby.

Typically, a plate-type heat exchanger is formed by laminating thin metal plates in a plurality of stages, and a contact surface between the plates is adhered by a joining agent. The metal plate forms a wave-shaped herringbone in a predetermined pattern, And a port hole through which the heating or heating heating medium flows or flows out is provided at the edge. As a conventional technology related to such a plate type heat exchanger, there are a domestic utility model No. 0409691 (2006.02.20) proposed by the same inventor as the present invention, a domestic registration patent No. 1157711 (2012.06.12) Patent Publication No. 1094469 (Dec. 2011), and the like, and a detailed description thereof will be omitted.

Here, in the case of a seawater processing apparatus using a lot of seawater such as a ship or a seawater treatment plant, most of the piping is made of stainless steel material (SUS304, SUS316). Oxidation reaction and corrosion phenomenon occurs due to the influence of seawater, Damage is caused. The pipe can be designed to have a sufficiently thick thickness (schedule) in consideration of corrosion, can be periodically replaced, and is easy to maintain. However, the plate heat exchanger applied to sea water is mainly made of stainless steel SUS304 or SUS316L because the thickness of the metal plate is as thin as 0.5-1.0 mm, so it is vulnerable to corrosion and high risk of leakage. However, considering that the stainless steel metal plate has an annual corrosion rate of about 0.7 mm, there is a high risk that it will be damaged and broken from a vulnerable area after about one year of use.

In recent years, a plate type heat exchanger made of a titanium material strong in seawater has been used, which is very expensive and requires a high cost. In addition, the titanium metal plate needs to use nickel (Ni) as a bonding agent. In order to braze with nickel, the surface of the metal plate is required to be pretreated or post-treated, and the process is complicated and difficult. It is inefficient and uneconomical. In addition, since the bonding strength is low, there is a high risk of occurrence of fatigue crack due to high operating pressure or pulsation.

Korean Utility Model Publication No. 0409691 (Feb. 20, 2006, invented by the present inventor) Korean Patent Registration No. 1157711 (Jun. 12, 2012, the same invention by the present inventors and inventors) Korean Patent Registration No. 1094469 (Dec. 20, 2011, invented by the present inventor)

An object of the present invention is to provide a plate type heat exchange module in which a bundle type heat exchange module is formed by brazing with heat transfer plates and electrolytically plating the plate type heat exchange module as a whole to completely form a plating layer on the outside and inside of the plate heat exchange module, And a manufacturing method of the plate-type heat exchange module and a method of manufacturing the plate-type heat exchange module having a strong corrosion resistance by nickel plating.

Conventional conventional shell and tube type heat exchangers and quadrangular sealed plate type heat exchangers have a large volume, so that the volume of the product that can be used in the plating bath is limited. When the inside is completely sealed And the outlet is not included), the plating solution can not penetrate into the heat exchanger, so that the electrolytic plating is impossible. However, in the present invention, since it is constituted by a bundle type compact plate heat exchanger module which is strongly bonded by copper brazing, the plate can be immersed in the plating bath at one time and the work is easy. As a result, if the product is immersed in the plating bath, the plating solution quickly penetrates into the heat exchanger (heat transfer plate) in the immersed state, and the electrolytic plating is uniformly performed evenly.

In order to accomplish the above object, the present invention provides a method of manufacturing a bundle type heat exchange module having a strong corrosion resistance by nickel plating, comprising the steps of: (1) heating or heating a heat- A first step (S1) of forming a bending portion and a heat transfer plate having a porthole formed at an edge thereof; A second step (S2) of adding a filler of a material selected from the group consisting of copper (Cu) and copper alloy between the heat transfer plates and brazing to form a plate heat exchange module integrated with the heat transfer plates; The plate heat exchanger module is immersed in the corrosion electrolytic cell in the state that positive (+) poles are connected to penetrate the corrosion electrolytic solution into the inside of the corrosion electrolytic cell, and a steel plate to which negative (- A third step (S3) of pre-treating the surface of the plating by applying a current pulse for 60 to 120 seconds by a pulse rectifier at a temperature of the corrosion electrolyte of 15 to 22 ° C, ; The plate type heat exchange module connects negative (-) poles and immerses the plate in an electrolytic solution of a plating bath to uniformly infiltrate the electrolytic solution into the plating bath, and a nickel anode is connected to the positive A fourth step (S4) of subjecting the plate type heat exchange module to electrolytic plating by applying a current pulse for 60 to 120 minutes by a pulse rectifier at a temperature of the electrolyte of 50 to 80 ° C. A fifth step (S5) of withdrawing the plate heat exchange module from the plating bath and washing and drying the plate heat exchange module; Type plate heat exchanger module having high corrosion resistance by nickel plating, and a plate heat exchanger module of a bundle type having high corrosion resistance by nickel plating, which is produced by the method.

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According to the present invention, the plate type heat exchange module is characterized in that guide portions are formed on both sides of the heat transfer plate.

According to the present invention, the plate-type heat exchange module is integrated by brazing in a state in which the reinforcing plate closely contacts the lower and upper surfaces of the heat transfer plate.

In the present invention, a plate-type heat exchange module having a bundle-type copper-brazed joint is put into a plating bath and electrolytic plating is performed on the entire outer and inner parts, thereby facilitating the plating operation, excellent workability and productivity, It is possible to supply excellent quality products at low prices. The plate heat exchanger module thus formed has a uniform plating layer on the inner surface, which is excellent in strength, durability, and corrosion resistance, especially in seawater, and has excellent quality, long service life, and low maintenance cost.

The present invention is advantageous in that the plate heat exchange module is made of stainless steel (STS) and is robust, has high reliability for quality, has good tensile strength and elongation, and has excellent mechanical workability such as a press. Further, the reinforcing plate is provided on the upper surface and the lower surface of the heat transfer plate, so that the plate heat exchange module becomes more rigid and the allowable pressure is increased.

The present invention provides an effect of further enhancing the electrodepositability and plating efficiency in the succeeding electroplating process and uniformizing the plating layer and improving the quality through a pretreatment for finely corroding the plating surface of the plate type heat exchange module.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing a manufacturing method of a bundle type plate heat exchange module having high corrosion resistance by nickel plating according to a preferred embodiment of the present invention. FIG.
2 is an exploded perspective view of a bundle type plate heat exchange module according to a manufacturing method of the present invention.
3 is a view illustrating a plating process of the bundle type plate heat exchange module.
FIG. 4 is a photograph of a product showing the internal state by partially cutting the plate-type heat exchange module through the plating process as described above. FIG.
FIG. 5 is a view showing a state of use of a nickel-plated bundle type heat exchanger module according to a manufacturing method of the present invention. FIG.

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

According to the above drawings, the present invention provides a method of manufacturing a bundle type heat exchange module having a strong corrosion resistance by nickel plating, comprising the steps of: heating or heating a heat transfer channel (14) to a metal plate made of stainless steel (STS) A first step (S1) of forming a bending portion (16) and a heat transfer plate (12) having a port hole (15) formed at its edge; A second step (S2) of adding a filler between the heat transfer plates (12) and brazing and joining them to form an integrated plate heat exchange module (10); The plate type heat exchange module 10 is immersed in the corrosion electrolytic cell in the state that positive (+) poles are connected to penetrate the corrosion electrolytic solution into the inside of the corrosion electrolytic cell, and an iron plate to which a negative A third step (S3) of pre-treating the plating surface of the plate-type heat exchange module (10) by applying a power source to increase the plating efficiency of the subsequent electrolytic plating step; The plate type heat exchange module 10 is connected to a negative electrode and immersed in the electrolyte solution 32 of the plating tank 30 so that the electrolytic solution 32 is uniformly penetrated into the plating solution 30, A fourth step (S4) of applying electrolytic plating to the plate heat exchange module (10) as a whole by applying a power in a state in which a nickel (Ni) anode (34; A fifth step (S5) of withdrawing the plate heat exchange module (10) from the plating tank (30) and washing and drying the plate heat exchange module (10); .

The above is explained in more detail as follows.

A method of manufacturing a bundle type plate heat exchange module having high corrosion resistance by nickel plating according to the present invention includes a first step S1 of processing a heating or heating heat transfer path 14 and a porthole 15 to a heat transfer plate 12, A second step S2 of brazing the heat transfer plates 12 to form a plate heat exchanging module 10, a third step S3 of pretreating the plating surface, a step of transferring the plate heat exchanging module 10 as a whole A fourth step S4 of plating, and a fifth step S5 of washing and drying the plate-type heat exchange module 10.

Step 1: Heat transfer plate forming step (S1)

The heat transfer plate 12 is made of a roll-shaped plate material in which a thin metal plate having a constant width is continuously wound, is cut into a cutter, and cut to a predetermined length to produce a heat transfer plate material having a predetermined unit area. As shown in FIG. 2, the heat transfer plate material is preferably a disc-shaped circular plate, or may have a square, rectangular, hexagonal, polygonal, or other shapes that are applied to a rectangular plate heat exchanger. And design specifications.

Next, the heat transfer plate material is put into a mold (press mold) of the press to make the heat transfer plate 12. The heat transfer plate 12 is formed with a heating or heating heat transfer path 14 having a predetermined pattern on its surface and a port hole 15 communicating with the heat transfer path is formed at the edge of the heat transfer plate 12. The heat transfer medium or the heat transfer medium is heat- . The bending portion 16 is formed in a corrugated or trapezoidal shape on the rim of the heat transfer plate 12 so that the outer peripheral surface 17 of the plate heat exchange module 10 is brazed when the heat transfer plates 12 are brazed, Is formed firmly by the honeycomb structure.

Step 2: Plate Heat Exchanger Module Manufacturing Process (S2)

The heat transfer plate 12 and the filler material (not shown) are alternately stacked, stacked in multiple stages, fixed in close contact with each other, placed in a heating furnace, and then heat-treated at a high temperature by a brazing- (10). In the plate type heat exchange module 10, the heating heat medium flowing into the one-side port hole 15 flows into the heat transfer channel of the respective channels. The heating heat medium flows through one side passage of the outer peripheral surface 17 opened to the outside, exchanges heat with the heating medium of the other channel, and then flows out to the outside through the other side passage. The plate-type heat exchange module 10 is formed in a honeycomb structure by the bent portions 16 at the side surfaces thereof, and the strength is reinforced and firmly reinforced.

The plate heat exchanger module 10 is a 'disc bundle type plate heat exchanger' of Korean Patent Publication No. 1733934 (registered on July 27, 2008), which is proposed and registered by the same inventor as the present invention A disk type heat exchanger having a honeycomb-shaped rim 'of U.S. Patent No. 1632,954 (Jun. 26, 176, registration) will be made more understandable.

In addition, according to the present invention, the heat transfer plate 12 is made of stainless steel (STS), and the excipient is selected from copper (Cu) and copper alloy. The plate heat exchanger module 10 is made of stainless steel (STS) as the material of the heat transfer plate 12 and has excellent strength and durability, excellent reliability against quality, long life, excellent tensile strength and elongation, Do. And as the filler material, it is bonded by copper brazing using copper or copper alloy material, so it has excellent bonding strength, excellent product quality and reliability, and low risk of leakage.

According to the present invention, the plate-type heat exchange module (10) is integrated by brazing in a state in which the reinforcing plate (20) is in close contact with the lower and upper surfaces of the heat transfer plate (12). That is, as shown in FIG. 2, the plate type heat exchange module 10 is reinforced by joining the reinforcing plate 20 to the uppermost surface and the lower surface of the heat transfer plate 12, and the strength and durability of the plate heat exchange module 10 are greatly improved. The reinforcing plate 20 is formed in the same shape as the heat transfer plate 12 and is completely integrated by brazing together with the heat transfer plate 12. The material of the reinforcing plate 20 is preferably made of stainless steel (STS) like the heat transfer plate, (CS) or a common metal in consideration of corrosion resistance and corrosion resistance.

The plate heat exchanger module 10 manufactured as described above is introduced into the cell housing 40 of the heat exchanger so that the heat medium and the heat medium to be heated exchange heat with each other.

According to the present invention, the plate type heat exchange module (10) is characterized in that guide portions (18) are formed on both sides of the heat transfer plate (12). The heat transfer plate 12 has a guide portion 18 protruding from one side or both sides of the edge of the heat transfer plate 12. The guide portion 18 slides while contacting the inner surface of the cell housing 42 of the heat exchanger 40 . The chamber 44 is divided into upper and lower chambers by the guide portion 18. For example, the heating medium (heated or heated) flowing into the upper chamber completely passes through the heat exchange module and flows out to the lower chamber, thereby improving heat exchange efficiency.

The plate type heat exchange module 10 is formed such that the guide portions 18 are formed on both sides of the heat transfer plate 12 so that the guide portions 18 slide in contact with the inner surface of the cell housing 42 of the heat exchanger 40 The chamber 44 is divided into upper and lower parts. The plate type heat exchange module 10 guides or guides the entry and exit of the plate heat exchange module 10 while sliding on the inner surface of the cell housing 42 and guiding portions 18 protruding from both sides of the heat transfer plate 12 and the reinforcing plate 20, Or separation is easy. The chamber 44 in the inner space of the cell housing 42 is divided into upper and lower parts by the guide part 18. For example, the heating medium flowing into the inlet-side upper chamber of the cell housing 40 is sufficiently heat-exchanged while completely passing through the plate-type heat exchange module 10, and then discharged to the lower chamber on the outlet side.

Step 3: Plating surface preprocessing step (S3)

The present invention minutely corrodes the surface of the plating of the plate-type heat exchange module 10, thereby further enhancing the plating electrodepositability and efficiency.

According to the present invention, the electrolytic plating process in the fourth step (S4) may be performed in a state where positive (+) poles are connected to the plate heat exchange module (10) before electrolytic plating of the plate heat exchange module , The corrosion surface of the plate heat exchange module (10) is corroded by applying a power source in a state of immersing the corrosion electrolytic solution in the corrosion electrolytic bath, A third step (S3) of pretreating the surface of the plating to increase the plating efficiency of the plating step; And a control unit. In other words, the plate heat exchanger module 10 manufactured as described above is charged into the corrosion electrolyzer to connect the positive (+) electrode and the negative (-) electrode to the charged steel plate The heat exchange plate 10, that is, the heat transfer plate 12, the reinforcing plate 20, and the brazed joint portion, is corroded evenly by supplying external power.

According to the present invention, in the plating surface pretreatment step of the third step (S3), the temperature of the corrosion electrolytic solution is 15 to 22 占 폚 and the current pulse is applied for 60 to 120 seconds by the pulse rectifier . In other words, the temperature of the corrosion electrolytic solution is within the range of 15 to 22 ° C, and the voltage of the pulse rectifier is applied at about 5 to 7 V to perform surface corrosion. In this case, it is preferable to perform the surface erosion treatment time of about 60 to 120 seconds, and when the treatment time is less than 60 seconds, the corrosion surface becomes stained or cloudy, and the adhesion of the plating becomes poor or the surface of the plating becomes uneven. Conversely, if the treatment time exceeds 120 seconds, excessive corrosion may occur and the copper brazing joint portion may be damaged. In particular, the heat transfer plate is preferably treated so as not to be vulnerable to local portions where the thickness is likely to be thinned by mechanical processing Time should not exceed 120 seconds.

The plate-type heat exchange module 10, which has been subjected to the plating surface pretreatment process as described above, is put into a water tank containing clean water to thoroughly clean the electrolytic solution and other residues, and then sufficiently dry to remove moisture.

Step 4: Electrolytic plating step (S4)

The plate type heat exchange module 10 is inserted into a plating bath 30 to be immersed in an electrolytic solution and a negative electrode is connected to the plating bath 30. A nickel anode 34 is disposed on one side of the plating bath 30, And positive (+) poles are connected. Then, power is supplied to both electrodes to perform electrolytic plating of the plate heat exchange module 10. The anode is an electrode on the side from which a current flows to the electrolyte when a current flows between the two electrodes with an electrolyte therebetween, that is, a positive electrode at which an oxidation reaction occurs, and means a portion where the metal dissolves . Nickel (Ni) is most preferable for the anode (34). The nickel plating is hard and has excellent strength and corrosion resistance, has a long life, has good surface gloss and is beautiful, and the performance of the plate heat exchanger is further improved. Or the anode 34 can be chromium or nickel-chromium-plated using conventional chromium (Cr), nickel-chromium alloy materials.

According to the present invention, the temperature of the electrolytic solution 32 is 50 to 80 DEG C and the pulse is applied for 60 to 120 minutes in the range of 15 to 20 A and 2.5 to 7.5 V by the pulse rectifier 36 . More specifically, the temperature of the electrolytic solution contained in the plating bath is suitably in the range of 50 to 80 ° C, and electroplating is performed by applying a pulse for 60 to 120 minutes within a range of 15 to 20 A and a voltage of 2.5 to 7.5 V with a pulse rectifier do. If the voltage is out of the range of 2.5 to 7.5 V, it is not preferable because the thickness variation of the plating layer becomes worse or the adhesion of the plating layer is lowered. It is also preferable to maintain the plating quality constantly while maintaining the temperature of the electrolyte at 50 to 80 ° C , And the thickness of the subsequent plating layer is uniformly formed to about 80 to 300 mu m.

Step 5: Cleaning and drying step (S5)

After the electrolytic plating is completed, the plate-like heat exchange module 10 is put into a water tank containing water, and the inside and the outside are thoroughly cleaned to completely remove the electrolytic solution and the residue. Thereafter, the plate is sufficiently dried at a temperature of 100 ° C or higher in the dryer to remove moisture, and thus a bundle type plate heat exchange module 10 having high corrosion resistance is completed by nickel plating.

As shown in FIG. 4, the plate heat exchanger module 10 of the present invention manufactured as described above has an excellent durability and corrosion resistance because a plating layer is completely formed on the inner surface of the heat transfer plate and the brazed joint including the outer surface of the heat exchange module It can be seen that the quality is greatly improved.

The bundle type plate heat exchange module 10 having high corrosion resistance by nickel plating as described above is inserted into the inner chamber 42 of the cell housing 40 of the plate heat exchanger as shown in FIG. 5, and the heat heat medium and the heat medium to be heated are heat- . For example, the heating heat medium flowing into the first inlet of the upper part and the heat medium to be heated flowing into the second inlet of the side are heated along the heating or heating heat transfer channels of the respective channels (layers) provided in the plate heat exchange module 10 And then discharged to the first and second outflow ports on the other side. In addition, the plate type heat exchange module 10 divides the channel 42 into an upper channel and a lower channel in a state where the guide portion 18 is in sliding contact with both sides of the cell housing and contacts the guide rail, The heat exchange efficiency is improved.

10: plate type heat exchange module 12: heat transfer plate 14:
15: Port hole 16: Bent portion 17:
18: guide portion 20: reinforcing plate 30: plating tank
32: electrolyte solution 34: anode 40: cell housing
42: chamber

Claims (8)

A manufacturing method of a bundle type plate heat exchange module having high corrosion resistance by nickel plating,
A first step of forming a heat transfer plate 12 in which a heating or heating heat transfer path 14 and a bent portion 16 are formed on a metal plate made of stainless steel (STS) having a certain unit area and a porthole 15 is formed on the edge, S1);
A second step (S2) of adding a filler of a material selected from the group consisting of copper (Cu) and copper alloy between the heat transfer plates (12) and brazing and brazing to form an integrated plate heat exchange module (10);
The plate type heat exchange module 10 is immersed in the corrosion electrolytic cell in the state that positive (+) poles are connected to penetrate the corrosion electrolytic solution into the inside of the corrosion electrolytic cell, and an iron plate to which a negative The plating surface of the plate type heat exchange module 10 is corroded by applying a power source and a current pulse is applied for 60 to 120 seconds by the pulse rectifier at a temperature of the corrosive electrolytic solution of 15 to 22 ° C to pre- A third step S3;
The plate type heat exchange module 10 is connected to a negative electrode and immersed in the electrolyte solution 32 of the plating tank 30 so that the electrolytic solution 32 is uniformly penetrated into the plating solution 30, The temperature of the electrolytic solution 32 is 50 to 80 占 폚 and the voltage is 60 to 120 占 폚 by the pulse rectifier 36. In this case, A fourth step (S4) of electroplating the plate heat exchange module (10) as a whole by applying a current pulse for 5 minutes;
A fifth step (S5) of withdrawing the plate heat exchange module (10) from the plating tank (30) and washing and drying the plate heat exchange module (10); Wherein the plate-shaped heat exchanger module is made of nickel and has high corrosion resistance.
delete delete delete delete The method according to claim 1,
The plate-type heat exchange module 10 is integrally brazed with the reinforcing plate 20 in close contact with the lower and upper surfaces of the heat transfer plate 12. The plate heat exchanging module 10 is made of a nickel- ≪ / RTI >
The method according to claim 1,
Wherein the plate type heat exchange module (10) is formed with guide portions (18) on both sides of the heat transfer plate (12).
A nickel-plated heat exchanger module according to any one of claims 1, 6, and 7, which is manufactured by a method of manufacturing a heat exchanger module of a bundle type having high corrosion resistance by a nickel plating. Plate Heat Exchanger Module.

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