JP5913006B2 - Water leak repair method - Google Patents

Description

The present invention relates to a water leak repair method for coil piping as a heat exchanger for an air conditioner, for example.

If the air conditioner is used for a long time, the coil piping as a heat exchanger has a through hole due to corrosion or the like, and there is a problem that water leaks from there. Conventionally, in order to repair the through hole, the following (1) to ( Although the method of 3) was carried out, there was a problem in each method.
(1) A method in which a through-hole is closed and repaired by welding (brazing) a portion of a through-hole, which is a leaked portion of the coil pipe, from the outer surface of the coil pipe.
However, in this method, water leakage from the pipe extending to the surface portion of the coil can be repaired by removing the fins and closing the leaking portion by welding or the like. In the case of a leak, it is difficult to specify the location of the water leak, and the entire area of the pipe must be covered with welding or the like, resulting in a new concern that the air-conditioning capacity is significantly reduced, and has not led to a fundamental solution.

(2) A method of stopping leakage of coil piping by introducing a chemical containing a leakage preventing component into the circulating cold / hot water system of the air conditioner.
However, in this method, the chemical is introduced into the total amount of water in the circulating cold / hot water system, and the chemical is circulated at all times. In addition, since the drug flows through the entire circulating cold / hot water system, problems such as blockage of pipes, pump devices, etc. in other parts also occur. In addition, since the amount of circulating water is enormous, the amount of chemicals to be added becomes large and the cost burden increases. Furthermore, when the slow flow rate part or the air conditioner itself is stopped, there is a possibility that the leakage preventing component of the medicine settles and adheres to block a part of the circulation path. As described above, the method of constantly circulating the medicine has many problems and is practically difficult.

(3) A method of repairing a water leak by coating the entire area of the coil piping with resin or the like.
However, in this method, the heat exchange efficiency of the air conditioner is deteriorated, and the air conditioning capacity is significantly reduced.

  Further, Patent Document 1 describes a mixture of elastic particles having various particle sizes, such as side dishes, which are cured by contact with air, and after pouring a predetermined amount of the same aqueous solution into a drained radiator. The inside of the radiator is pressurized with air pressure, and the radiator is swung back and forth and left and right so that the aqueous solution adheres to the radiator without any corners, and clogs the particles at the water leakage points of the radiator and includes the same particles. A method for repairing a water leak in a radiator is disclosed in which the water leak location is repaired by covering the inner and outer surfaces of the water leak location with a cured film of a curing agent.

JP 63-021496 A

  However, in the invention of Patent Document 1, since the aqueous solution adheres to substantially the entire area of the inner surface of the radiator, the heat exchange efficiency is significantly lowered by reducing the pipe diameter of the radiator. In addition, there is a possibility of causing malfunction of each valve of the radiator, which is a problem.

This invention is made in view of this point, and it aims at providing the water leak repair method which can repair the water leak location of the coil piping as a heat exchanger, maintaining heat exchange efficiency. And

In order to solve the above-mentioned problem, a water leakage repair method of the present invention includes a water draining step for draining water in a coil pipe as a heat exchanger, and a water leak point closure in the coil pipe after the water draining step. by circulating agent comprising a special resin which is cured by moisture touched use powder and the air is evaporated to dryness, and the circulating step of filling the drug in water leakage position of the coil pipe, after the circulation step, an outer air pumping steps for pumping air toward the outer surface of the coil pipe, after the circulation step, excess drug was removed, water leakage position by pumping air into the coil the pipe of the coil in the pipe wherein the inner air pumping curing the special resin of the filled drug, and in the outer air pumping step, the equipment is the heat exchanger, it is arranged opposite to the coil pipe It is characterized by the use of a blower.
Thereby, it becomes possible to repair the water leak location of coil piping as a heat exchanger, maintaining heat exchange efficiency.

Various aspects of the water leak repair method of the present invention and their functions will be described in detail in the section of the following aspect of the invention.

(Aspect of the Invention)
In the following, some aspects of the invention that can be claimed in the present application (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. In addition, each aspect is divided into a term like a claim, it attaches | subjects a number to each term, and is described in the format which quotes another term as needed. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description, embodiments, etc. accompanying each section, and as long as the interpretation is followed, there may be embodiments in which other constituent elements are added to the aspects of each section. In addition, an aspect in which the constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

(1) A method for repairing water leakage in a coil pipe as a heat exchanger, a draining step for draining water in the coil pipe, and a powder for closing a water leak point in the coil pipe after the draining step. and by circulating agent comprising a special resin which is cured by moisture touches the air is evaporated to dryness, and the circulating step of filling the drug in water leakage position of the coil pipe, after the circulation stearyl-up, the After the outer air pumping step for pumping air toward the outer surface of the coil pipe, and after the circulation step , excess chemicals in the coil pipe are removed, and air is pumped into the coil pipe to fill the water leak location. includes an inner air pumping curing the drug of special resin, and blowing in the outer air pumping step, the equipment is the heat exchanger, which is disposed opposite to the coil pipe Leak repair method characterized by the use of (corresponding to claim 1).
In the water leakage repair method of (1), after draining the water in the coil piping at the draining step, the water is evaporated and dried by touching the powder for closing the leakage site and air at the circulation step. When the medicine containing the special resin to be circulated is circulated in the coil pipe, the water leakage spot closing powder is filled together with the special resin in the through holes, which are the water leak spots of the coil pipe. Subsequently, in the inner air pressure feeding step, excess chemicals in the coil piping are removed, and air is pressure fed into the coil piping so that the air touches the special resin on the inner surface side of the coil piping in the through hole. The special resin at the position is cured to form a cured film, and the through hole is closed.
In addition, the special resin of the medicine has a property that it does not dissolve in water once it is cured by contact with air.
In order to shorten the curing time of the special resin for the medicine, it is preferable to circulate the medicine at a high temperature and to use hot air for the air in the inner air pressure feeding step.
Further, after the circulating step, it is provided with the step feeding outside air pressure for pumping air toward the outer surface of the coil pipe, located outside surface side of the coil pipe in the through-hole is a water leakage portion of the coil pipe special By contacting the resin with air, the special resin at that position is cured to form a cured film , and the through hole is closed.
Again, the use of warm air to the air, as possible out is possible to shorten the curing time of the drug special resin.

( 2 ) The water leakage repair method according to ( 1 ), wherein the outer air pressure feeding step is performed between the circulation step and the inner air pressure feeding step.
( 3 ) The water leakage repair method according to ( 1 ), wherein the inner air pressure feeding step and the outer air pressure feeding step are simultaneously performed after the circulation step.
In the water leakage repair method according to the items ( 2 ) and ( 3 ), the special resin filled in the through holes, which are the water leakage portions of the coil piping, can be cured efficiently or quickly to form a cured film. .

( 4 ) The water leakage repair according to any one of (1) to ( 3 ), wherein the powder for closing a water leakage portion is a vegetable fine powder having a particle diameter of 0.04 mm to 1 mm. Method.
In the water leakage repair method of ( 4 ), the most suitable particle diameter is used to close the through hole, which is the water leakage location of the coil piping.

( 5 ) The draining step, the circulation step, and the inner air pressure feeding step use the draining port and the venting port already provided in the coil pipe. The water leak repair method according to any one of to ( 4 ) (corresponding to claim 2 ).
In the water leakage repair method of ( 5 ), since the drain port and the air vent port that are already installed in the coil pipe are used, it is versatile and efficient.

( 6 ) The air vent port portion is already provided at the upper end of the coil pipe, and the water drain port portion is already provided at the lower end of the coil pipe. In the circulation step, the medicine is supplied to the coil pipe. The water leakage repair method according to ( 5 ) (corresponding to claim 3 ), characterized in that the inside is circulated from the drain port to the vent port.
In the water leakage repair method of ( 6 ), the drug is circulated in the coil pipe from the drain port located at the lower end of the coil pipe toward the air vent port located at the upper end of the coil pipe. Thus, the medicine can be spread over almost the entire area of the coil piping.

( 7 ) Item ( 5 ) or ( 6 ), wherein in the inner air pressure feeding step, air is pressure-fed in the coil pipe from the air vent port to the water drain port. The water leak repair method according to claim 4 (corresponding to claim 4 ).
In the water leakage repair method of ( 7 ), since the wet air has a large specific gravity, the water outlet is located at the lower end of the coil pipe from the air outlet located at the upper end of the coil pipe in the air feeding direction. It is preferable to set in the direction toward.

According to the present invention, a physical restoration means (adhesive, cutting or modification, etc.) while maintaining the heat exchange efficiency without any, water leakage can be repaired water leakage portion of the coil pipe as a heat exchanger complement We can provide a repair method .

FIG. 1 is a schematic diagram showing a water leakage repair device and an air conditioner according to an embodiment of the present invention. FIG. 2 is a front view of coil piping as a heat exchanger. FIG. 3 is a front view of the apparatus main body of the water leak repair apparatus according to the embodiment of the present invention. FIG. 4 is a diagram showing a state where a through hole, which is a water leaking portion of a coil pipe, is blocked by a fiber and a special resin.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
As shown in FIG.1 and FIG.4, the water leak repair apparatus 1 which concerns on embodiment of this invention is a fiber for the through-hole 3a which is the water leak location of the coil piping 3 as a heat exchanger for the air conditioners 2, for example. 14 and the special resin 15 are used for repairing.
As shown in FIG. 1, the air conditioner 2 is roughly configured by a coil pipe 3 that is a heat exchanger and a blower 4 that blows air toward the coil pipe 3. Reference numeral 5 shown in FIG. 1 is a duct.
As shown in FIG. 2, an air vent port 6 is provided at the upper end of the coil pipe 3, and a circulating cold / hot water outlet 8 connected to the circulating cold / hot water system so as to be adjacent to the air vent port 6. Is provided. Further, a drain port 7 is provided at the lower end of the coil pipe 3, and a circulating cold / hot water inlet 9 connected to the circulating cold / hot water system is provided adjacent to the drain port 7.

  As shown in FIG. 1, the water leakage repair apparatus 1 is configured such that the apparatus main body 10 including the tank 12 and the fibers 14 and the air filled in the tank 12 of the apparatus main body 10 are in contact with the air and the water is evaporated and dried. A circulating hose 18 for circulating the chemical 13 in the tank 12 of the apparatus main body 10 into the coil pipe 3 and the chemical 13 in the tank 12 of the apparatus main body 10. A pressure feed pump 21 that feeds pressure into the coil pipe 3 via 18 and an air supply device 22 that communicates with the circulation hose 18 and feeds air into the coil pipe 3 are provided.

  The chemical | medical agent 13 is comprised by adding predetermined amount of water to the thing (stock solution) with which the fiber 14 and the special resin 15 were already mix | blended (refer FIG. 4). However, antiseptics and rust inhibitors are added as necessary. The weight ratio (example) of the undiluted solution when these preservatives and rust inhibitors are added is 1% to 10% for the fiber 14, 5 to 30% for the special resin 15, 0.1% for the preservative, and rust prevention. The agent is 0.1% and the rest is water. The fiber 14 is desirably a vegetable fine powder having a particle diameter of 0.04 mm to 1 mm, and this particle diameter is most suitable for closing the through hole 3 a which is a water leaking portion of the coil pipe 3. The special resin 15 has a property that it hardens when touched with air and does not dissolve in water once hardened when touched with air. The special resin 15 is, for example, an acrylic resin, a urethane resin, an olefin resin, or the like.

  As shown in FIG. 3, the apparatus body 10 includes a tank 12 filled with a medicine 13 (see FIG. 4), a feed pipe 16 that communicates with the pressure feed pump 21, and a return pipe 17 that communicates with the tank 12. I have. An air supply device 22 is connected to the return pipe 17 via an on-off valve 24. A gate valve 26 is connected to the return pipe 17 below the connection with the air supply device 22.

A pressure pump 21 is disposed on the apparatus main body 10. The feed pipe 16 of the apparatus main body 10 and the pressure feed pump 21 are communicated with each other. The pressure-feed pump 21 pressure-feeds the medicine 13 in the tank 12 into the coil pipe 3 via a feed pipe 16 and a feed circulation hose 19 described later. A circulation pressure regulating valve 27 is disposed in the feed pipe 16 at a position on the pressure feed pump 21 side. The circulating pressure of the medicine 13 can be adjusted by changing the opening degree of the circulating pressure adjusting valve 27. In the feed pipe 16, a backflow prevention valve 28 is disposed at a position closer to the coil pipe 3 than the circulation pressure adjustment valve 27. The backflow prevention valve 28 restricts the backflow of the medicine 13 toward the pressure feed pump 21 when the pressure feed pump 21 is stopped. A pressure sensor 35 is connected to the feed pipe 16 at a position closer to the coil pipe 3 than the backflow prevention valve 28. A temperature sensor 36 is connected to the feed pipe 16 at a position closer to the pressure feed pump 21 than the circulation pressure adjustment valve 27. A branch pipe 16 a extends from the position between the pressure sensor 35 and the backflow prevention valve 28 to the feed pipe 16, and the branch pipe 16 a is connected to the tank 12. An on-off valve 40 is disposed in the middle of the branch pipe 16a.
Reference numeral 30 denotes a supply port communicating with the tank 12, and the medicine 13 flows into the tank 12 from the supply port 30. On the other hand, reference numeral 31 denotes a discharge port communicating with the tank 12, and the medicine 13 is discharged from the discharge port 31 to the outside of the apparatus body 10 and collected. Reference numeral 32 denotes a pump operation control panel.

  The circulation hose 18 is connected to the feed pipe 16 of the apparatus main body 10, and the feed hose 19 connected to the drain port 7 already provided at the lower end of the coil pipe 3 and the apparatus main body 10. A return circulation hose 20 is connected to the return pipe 17 and connected to the air vent port 6 already provided at the upper end of the coil pipe 3. The feed circulation hose 19 is for feeding the medicine 13 from the feed pipe 16 of the apparatus main body 10 to the coil pipe 3. The return circulation hose 20 is for returning the medicine 13 from the coil pipe 3 to the return pipe 17 of the apparatus main body 10. An air vent valve 25 is connected to the return circulation hose 20 at a position close to the connection portion with the air vent port 6 of the coil pipe 3. By this air vent valve 25, the circulation of the medicine 13 in the coil pipe 3 can be made smooth.

  Moreover, the apparatus main body 10 of this water leak repair apparatus 1 is each provided with the driven wheel 33 at the four corners of the lower surface, and is comprised so that a movement is possible.

Next, the water leak repair method using the water leak repair apparatus 1 which concerns on embodiment of this invention is demonstrated.
First, in the water draining step, water is drained from the coil pipe 3.
Specifically, the circulating cold / hot water inlet 9 and the circulating cold / hot water outlet 8 of the coil pipe 3 are closed, and the air vent port 6 and the drain port 7 of the coil pipe 3 are opened. Drain the water. When the state of the drained water is confirmed and it is determined that the inside of the coil pipe 3 needs to be cleaned, only the drain port 7 is closed and the circulating cold / hot water inlet 9 and the circulating cold / hot water outlet are closed. 8 is opened, and the coil pipe 3 is washed by flowing water into the coil pipe 3. In addition, when draining the water in the coil pipe 3, the air supply device 22 is connected to the air vent port 6 at the upper end of the coil pipe 3 and the water is pumped by pumping air into the coil pipe 3. You may make it do.

Next, in a circulation step, a chemical agent 13 containing a special resin 15 that cures when the moisture is evaporated and dried by touching the fiber 14 and the air in the coil pipe 3 is circulated, and the through hole 3a that is a water leaking portion The medicine 13 is filled inside.
Specifically, first, a medicine 13 is manufactured by adding a predetermined amount of water to a material (stock solution) in which the fiber 14 and the special resin 15 are already blended. Then, the chemical | medical agent 13 is filled in the tank 12 from the supply port 30 of the apparatus main body 10 of the water leak repair apparatus 1. FIG. Subsequently, the feed circulation hose 19 is connected to the feed pipe 16 of the apparatus body 10 and to the drain port 7 at the lower end of the coil pipe 3. The return circulation hose 20 is connected to the return pipe 17 of the apparatus main body 10 and to the air vent port 6 at the upper end of the coil pipe 3. At this time, the air vent valve 25 connected to the return circulation hose 20 is opened. Further, the on-off valve 24 between the return pipe 17 and the air supply device 22 is in a closed state, and the gate valve 26 is in an open state. Furthermore, the on-off valve 40 provided in the branch pipe 16a is in a closed state. The opening of the circulation pressure adjusting valve 27 is adjusted so that the medicine 13 circulates in the coil pipe 3 at a predetermined pressure. Then, the pumping pump 21 is driven. Then, the medicine 13 is pumped from the tank 12 of the apparatus main body 10 into the coil pipe 3 through the feed pipe 16 and the feed circulation hose 19 at a predetermined pressure. In the coil pipe 3, the medicine 13 is pumped from the drain port 7 toward the air vent 6 (pumped from the lower end of the coil pipe 3 toward the upper end). Finally, the medicine 13 is returned from the air vent port 6 of the coil pipe 3 into the tank 12 via the return circulation hose 20 and the return pipe 17 of the apparatus body 10. As a result, the medicine 13 spreads over substantially the entire area in the coil pipe 3, and the fibers 14 in the medicine 13 overlap each other in the through hole 3a that is a water leaking portion of the coil pipe 3 (the state shown in FIG. 4A). ) And filled with the special resin 15.
In this circulation step, it is preferable to circulate the drug 13 in a state where the liquid temperature is increased in order to accelerate the curing of the special resin 15 of the drug 13.

Next, air is pumped toward the outer surface of the coil pipe 3 in the outer air pumping step.
Specifically, air is pumped toward the outer surface of the coil pipe 3 using the blower 4 that is the equipment of the air conditioner 2. As a result, in particular, in the through hole 3a, which is a water leaking portion of the coil pipe 3, when the air touches the special resin 15 located on the outer surface side of the coil pipe 3 to evaporate and dry the moisture, the special resin at that position 15 is cured to form a cured film, and the through hole 3a is closed.
Also in this outer air pressure feeding step, it is preferable that the air from the blower 4 is warm air in that the curing of the special resin 15 of the medicine 13 is accelerated.

Next, in the inner air pressure feeding step, the medicine 13 in the coil pipe 3 is removed, the air is pumped into the coil pipe 3 and the special resin 15 of the medicine 13 filled in the through hole 3a which is a water leaking portion. Is cured.
Specifically, first, the gate valve 26 is closed immediately before the pumping pump 21 is stopped, and the on-off valve 40 provided in the branch pipe 16a is immediately closed. Next, after stopping the pumping pump 21, the air vent valve 25 connected to the return circulation hose 20 is gradually fully opened. Then, the valves are opened in the order of the on-off valve 40 and the gate valve 26. Then, the medicine 13 is returned and collected in the tank 12 of the apparatus body 10 via the feed circulation hose 19 and the return circulation hose 20, respectively. Next, the gate valve 26 is closed to block communication between the return pipe 17 and the tank 12. Further, the air vent valve 25 connected to the return circulation hose 20 is closed. Then, the on-off valve 24 between the return pipe 17 and the air supply device 22 is opened, the communication between the return pipe 17 and the air supply device 22 is established, and the air supply device 22 is driven. Then, air is pumped from the return pipe 17 of the apparatus body 10 into the coil pipe 3 via the return circulation hose 20. In the coil pipe 3, air is pumped from the air vent port 6 toward the water drain port 7 (pumped from the upper end to the lower end of the coil pipe 3). Finally, the air is released into the tank 12 from the drain port 7 of the coil pipe 3 through the feed circulation hose 19, the feed pipe 16 and the branch pipe 16a of the apparatus body 10. As a result, in the through hole 3a which is a water leaking portion of the coil pipe 3, air touches the special resin 15 located on the inner surface side of the coil pipe 3 to evaporate and dry the moisture, so that the special resin 15 at that position is cured. Thus, a cured film is formed and the through hole 3a is closed. At this point, as shown in FIG. 4B, all the special resin 15 filled in the through hole 3a is cured, and the through hole 3a is closed together with the fiber 14 by the cured coating. Therefore, as can be seen from FIG. 4B, after repairing the through-hole 3 a, the repaired portion is in a state where the hardened coating of the special resin 15 slightly bulges outward from the outer surface of the coil pipe 3. The inner surface of 3 is flat.
Also in this inner air pumping step, it is preferable that the air pumping is warm air in that the curing of the special resin 15 of the medicine 13 is accelerated.

Next, in the leakage inspection step, a leakage inspection is performed to determine whether or not the through hole 3a which is a water leakage portion of the coil pipe 3 is sufficiently closed.
Specifically, in the state where the air vent port 6 is opened and the water vent port 7 is closed, the circulating cold / hot water inlet 9 and the circulating cold / hot water outlet 8 of the coil piping 3 are opened, respectively. Water is allowed to flow inside, and water leakage to the outside of the coil pipe 3 is visually inspected. If this inspection passes, the water leak repair work is completed. On the other hand, if this inspection fails, the above-described water draining step, circulation step, outside air pressure feeding step and inside air pressure feeding step are repeated.

In the water leak repair method according to the present embodiment, the circulation step → the outer air pressure feeding step → the inner air pressure feeding step is performed in this order, but after the circulation step, the outer air pressure feeding step and the inner air pressure feeding step are performed. You may make it carry out substantially simultaneously. These may be appropriately selected according to the curing efficiency of the special resin 15 in the through hole 3a which is a water leaking portion.
In addition, it is certain that the embodiment including the outer air pumping step is the best embodiment in consideration of the curing time of the special resin 15, but even in the embodiment omitting the outer air pumping step, If the air pressure feeding step is provided, it is possible to close the through hole 3a, which is a water leak point, with a hardened film of the fiber 14 and the special resin 15.

  As described above, in the embodiment of the present invention, as a water leakage repair method, a water draining step for draining water in the coil pipe 3 as a heat exchanger for the air conditioner 2, and a fiber in the coil pipe 3 14 and a circulation step of circulating the chemical 13 containing the special resin 15 that is cured by evaporating and drying the moisture by contact with air, and filling the through-hole 3a at the water leakage location with the chemical 13; An external air pumping step for curing the special resin 15 of the medicine 13 filled in the through-hole 3a at the water leaking portion from the outer surface side of the coil pipe 3 and an extra medicine 13 in the coil pipe 3 An inner air pressure feeding step for curing and specially curing the special resin 15 of the medicine 13 filled in the through hole 3a in the water leaking portion from the inner surface side of the coil piping 3 . Thereby, the through-hole 3a which is a water leak location of the coil pipe 3 can be closed, and the extra special resin 15 and the fiber 14 in the coil pipe 3 are removed. Since the special resin 15 is not cured and deposited, the heat exchange efficiency can be maintained.

  Moreover, in the water leak repair method according to the present embodiment, since the air vent port 6 and the water drain port portion 7 that are already provided in the coil pipe 3 are used in the circulation step and the inner air pressure feeding step, it is practical. is there.

  Further, in the embodiment of the present invention, as the water leakage repair device 1, the medicine 13 containing the special resin 15 that is filled in the tank 12 and hardens when the moisture is evaporated and dried by touching the air with the fiber 14 and the air. A circulation hose 18 that circulates the drug 13 in the tank 12 to the coil pipe 3, a pressure feed pump 21 that pumps the drug 13 in the tank 12 into the coil pipe 3 via the circulation hose 18, and a circulation hose 18 ( Since the air supply device 22 that communicates with the return circulation hose 20) and pumps air into the coil pipe 3 is provided, the circulation step and the inner air pressure feed step described above can be performed. Can be obtained. In the water leak repair device 1 according to the present embodiment, the air supply device 22 is communicated with the return circulation hose 20 and the air is pumped into the coil pipe 3. However, the air is pumped into the coil pipe 3. Other methods may be employed if they can be made.

  DESCRIPTION OF SYMBOLS 1 Water leak repair apparatus, 2 Air conditioner, 3 Coil piping (heat exchanger), 3a Through-hole (water leak location), 4 Blower, 6 Air venting port, 7 Water venting port, 8 Circulating cold / hot water outlet , 9 Circulating low-temperature water inlet, 10 Device body, 13 Chemicals, 14 Fiber, 15 Special resin (cured coating), 16 Feeding pipe, 17 Returning pipe, 18 Circulating hose, 19 Feeding circulation hose, 20 Returning circulation hose , 21 Pressure pump, 22 Air supply device

Claims (4)

A method for repairing water leakage of coil piping as a heat exchanger,
A water draining step for draining water in the coil pipe;
After the water draining step , circulating the chemical containing a special resin that is cured by evaporating and drying the moisture by touching the water leakage point closing powder and the air in the coil piping, to the water leakage location of the coil piping A circulation step for filling the medicine;
After the circulation step, the outer air pressure feed step of pumping air against the outer surface of the coil pipe,
After the circulation step, an inner air pressure feeding step of removing excess medicine in the coil piping and pressure feeding air into the coil piping to cure the special resin of the medicine filled in the water leaking portion. ,
In the outer air pressure feeding step, a water leak repairing method using a blower disposed opposite to the coil pipe, which is an equipment of the heat exchanger . 2. The water according to claim 1 , wherein in the water draining step, the circulation step, and the inner air pressure feeding step, a water draining port and an air venting port already provided in the coil pipe are used. Leak repair method. The air vent port is already installed at the upper end of the coil pipe, and the water vent port is already installed at the lower end of the coil pipe,
3. The water leak repair method according to claim 2 , wherein in the circulation step, the medicine is circulated in the coil pipe from the drain port to the air vent port. The water leak repair method according to claim 2 or 3 , wherein, in the inner air pressure feeding step, air is pressure-fed in the coil pipe from the air vent port toward the water drain port. .

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