JP6387073B2 - HEAT EXCHANGER FOR AIR CONDITIONING EQUIPMENT AND METHOD FOR PRODUCING THE HEAT EXCHANGER - Google Patents

Description

  The present invention relates to a heat exchanger for an air conditioner and a method for manufacturing the heat exchanger, and more particularly to a heat exchanger for an air conditioner that is exposed to a corrosive environment containing an organic acid or ammonia and a method for manufacturing the heat exchanger.

  Generally, copper tubes are used as heat transfer tubes for heat exchangers installed in air-conditioning equipment. However, in crude oil storage warehouses and food factories such as natto, copper tubes corrode in a short period of time, such as water and refrigerant. There have been many reports of leaks of heat media. In fact, if you analyze air in these warehouses or factories or drain water from air conditioner coils, the main ingredients are acetic acid, formic acid at the crude drug warehouse, acetic acid, nitric acid, ammonia, and raw materials for salmon products at the natto manufacturing plant. Acetic acid and ammonia are detected in the storage, and it has been confirmed that this type of corrosion of copper tubes is caused by corrosive gases of organic acids such as acetic acid, carboxylic acid and formic acid, and ammonia.

  Therefore, in heat exchangers for air conditioning equipment installed in an environment containing such organic acids, stainless steel tubes with high corrosion resistance are often used as heat transfer tubes. However, when stainless steel pipes are used for heat transfer tubes, the heat conductivity is poor compared to copper tubes, so if the heat transfer area of the heat exchanger is not increased, the heat transfer equivalent to heat exchangers using copper tubes is required. There is a problem that the performance cannot be achieved and the heat exchanger is enlarged, and the initial cost at the time of introduction is increased.

  Therefore, in order to solve such problems, in recent years, heat exchangers for air conditioning equipment have been proposed in which a double pipe in which an inner pipe made of copper is covered with an outer pipe made of aluminum is used as a heat transfer pipe. In this heat exchanger for air conditioning equipment, after the exposed end of the inner pipe of the heat transfer pipe and the copper pipe of the joint pipe (U vent) are brazed and joined together, Corrosion-resistant treatment is applied by epoxy resin paint such as rust EP1000 and choice coat, and special coating such as powder resin coating (saponified EVA) (see Patent Document 1).

JP2015-49016A

  However, in the heat exchanger for air conditioning equipment described in Patent Document 1 described above, the copper tube itself may expand and contract due to the temperature difference of the fluid in the heat transfer tube generated during operation and the temperature of the air passing through the heat exchanger. Although it is expected, at this time, it is difficult for the paint with special coating to follow the expansion and contraction of the copper tube, and the possibility of peeling or cracking cannot be completely denied. In addition, since it takes time to perform corrosion resistance treatment by special coating on the outer surface of the joint pipe and the joint portion, there is a problem that it is difficult to improve workability.

  The present invention has been made to solve the above-described problems, and in an environment containing an organic acid or ammonia, the heat exchanger for an air conditioner and the heat exchanger of the heat exchanger capable of improving the corrosion resistance and workability of the coil are provided. The object is to provide a manufacturing method.

  In order to achieve the above-described object, a heat exchanger for an air conditioner according to the present invention includes a heat transfer tube configured by a double tube in which a copper inner tube is covered with an aluminum outer tube, and the inner tube of the heat transfer tube. A heat exchanger member connected to the end of the heat exchanger, a silicon covering material covering a connection portion between the exposed end portion of the inner pipe of the heat transfer tube and the heat exchanger member, and an outer periphery of the covering material It is provided with an aluminum sheath pipe provided.

  Further, in the heat exchanger for air conditioning equipment according to the present invention, the heat transfer tube is a straight tube, the heat exchanger member is a joint tube connecting adjacent straight tubes, and the joint tube is made of copper. The pipe is constituted by a double pipe in which an outer pipe made of aluminum is covered, and the covering material covers a connection portion between an exposed end of the inner pipe of the straight pipe and an exposed end of the inner pipe of the joint pipe. It is characterized by doing.

  Moreover, in the heat exchanger for an air conditioner according to the present invention, the heat transfer tube is a straight tube, the heat exchanger member is a stainless steel header tube connected to a header, and the covering material is the straight tube. A connecting portion between the exposed end portion of the inner pipe and the end portion of the header pipe is covered.

  Further, in the heat exchanger for an air conditioner according to the present invention, the heat transfer tube is a straight tube for a direct expansion coil, the heat exchanger member is a stainless capillary tube for the direct expansion coil, and the covering material Is characterized in that it covers a connecting portion between the exposed end portion of the inner tube of the straight tube and the end portion of the capillary tube.

  The present invention is a method of manufacturing a heat exchanger for an air conditioner that connects an exposed end portion of a heat transfer tube in which an outer tube made of aluminum is coated on a copper inner tube and a member for a heat exchanger, The exposed end portion of the inner tube of the heat transfer tube and the end portion of the heat exchanger member are joined in a state in which an aluminum sheath tube is loosely fitted to either one of the heat transfer tube and the heat exchanger member. A step of covering the connecting portion between the inner tube of the heat transfer tube and the heat exchanger member with a coating material made of silicon, and sliding the sheath tube along the heat transfer tube or the heat exchanger member. And a step of moving to the outer periphery of the covering material.

  The method for manufacturing a heat exchanger for an air conditioning equipment according to the present invention further includes a step of sealing both ends of the sheath tube after the sheath tube is moved to the outer periphery of the covering material. And

  According to the present invention, various excellent effects can be obtained, such as improvement of the corrosion resistance and workability of the coil in an environment containing an organic acid or ammonia.

It is a top view which shows the whole structure of the heat exchanger for air-conditioning equipment which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the heat exchanger for air-conditioning equipment which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the heat exchanger for air-conditioning equipment which concerns on the 1st Embodiment of this invention. It is a top view which shows the manufacturing method of the heat exchanger for air-conditioning equipment which concerns on the 1st Embodiment of this invention. It is a top view which shows the manufacturing method of the heat exchanger for air-conditioning equipment which concerns on the 1st Embodiment of this invention. It is a top view which shows the manufacturing method of the heat exchanger for air-conditioning equipment which concerns on the 1st Embodiment of this invention. It is a top view which shows the whole structure of the heat exchanger for air-conditioning equipment which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the principal part of the heat exchanger for air-conditioning equipment which concerns on the 2nd Embodiment of this invention.

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

  First, an air conditioner heat exchanger 10 according to a first embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a plan view showing the overall configuration of the heat exchanger 10 for air conditioning equipment according to the first embodiment of the present invention, and FIGS. 2 and 3 show the air conditioning according to the first embodiment of the present invention. Sectional drawing which shows the principal part of the heat exchanger 10 for facilities, FIGS. 4-6 is a top view which shows the manufacturing method of the heat exchanger 10 for air-conditioning equipment which concerns on the 1st Embodiment of this invention. In the following description, the vertical and horizontal directions will be described based on the direction shown in FIG. 1 for convenience.

  As shown in FIG. 1, the heat exchanger 10 for air conditioning equipment according to the first embodiment of the present invention includes a large number of heat transfer tubes 11 formed in a straight line and both end portions of each heat transfer tube 11. A water coil 14 composed of a joint tube 12 as a heat exchanger member connected to the heat exchanger member 11 and a large number of fins 13 arranged in parallel on the outer surface of the heat transfer tube 11, a casing 15 that supports the water coil 14, And a header 16 to which each heat transfer tube 11 of the water coil 14 is connected.

  2 and 3, the heat transfer tube 11 is constituted by a double tube (clad tube) in which a cylindrical copper inner tube 17 is covered with a cylindrical aluminum outer tube 18. ing. The tube diameter and the wall thickness of the heat transfer tube 11 are set so as to satisfy the conditions such as the passage flow rate and the tube pressure. For example, the tube diameter of the inner tube 17 of the heat transfer tube 11 is 15.88 mm, and the wall thickness of the inner tube 17. Is set in the range of 0.45 mm to 0.6 mm, and the thickness of the outer tube 18 is set in the range of 0.5 mm to 0.825 mm.

  As shown well in FIG. 2, the joint pipe 12 is a U-bent bent in a U-shape, in which a cylindrical copper inner pipe 19 is covered with a cylindrical aluminum outer pipe 20. It is composed of a double tube (clad tube). In the case of this embodiment, the pipe diameter of the inner pipe 19 of the joint pipe 12 is 15.88 mm, the thickness of the inner pipe 19 is in the range of 0.45 mm to 0.6 mm, and the thickness of the outer pipe 20 is 0.5 mm. Each is set. Since the thickness of the outer tube 20 of the joint tube 12 has a smaller influence on the heat exchange performance than the heat transfer tube 11, it is set to a thin thickness (0.5 mm) to the extent that no problem arises in corrosion resistance. And while improving workability, it can suppress that a wrinkle, a crack, etc. generate | occur | produce on the outer surface of the outer tube 20 at the time of the bending process of the joint pipe 12, and can improve corrosion resistance.

  As shown in FIG. 2, the connection between the heat transfer tube 11 and the joint tube 12 is performed by inserting the end portion 19 a of the inner tube 19 of the joint tube 12 into the end portion 17 a of the inner tube 17 of the heat transfer tube 11. It is done in the state. The connecting portion 21 is covered with a covering material 22 made of silicon, and a sheath 23 made of aluminum and having a cylindrical short tube shape is provided on the outer periphery of the covering material 22. In the present embodiment, the diameter of the sheath tube 23 is 22.00 mm, and the length L1 of the sheath tube 23 is longer by 10 mm to the left and right than the total length L2 of the end portion 17a and the end portion 19a. Formed and set to 58 mm. The covering material 22 has a viscosity of 900 to 1500 Pa · m, the covering thickness in the sheath tube 23 is set to 0.71 to 2.06 mm, and the sealing material 30 ( The coating thickness (see FIG. 6) is set to 3.00 mm or more.

  The fin 13 is made of an elongated rectangular thin plate made of aluminum, and the fin 13 has a large number of holes (not shown) through which the heat transfer tubes 11 can pass.

  The casing 15 is made of stainless steel (SUS) and has a rectangular frame shape. The casing 15 connects the left and right plates 24 and 25 through which the heat transfer tubes 11 pass, and the upper and lower ends of the left and right side plates 24 and 25. And a bottom plate 27.

  The header 16 is made of stainless steel (SUS) and has a cylindrical shape, and is disposed outside the casing 15 so as to be parallel to the right side plate 25. A header tube 28 made of stainless steel (SUS) and having a cylindrical short tube shape is connected to the outer peripheral wall of the header 16 from the left side, and the heat transfer tube 11 is connected to the header 16 via the header tube 28. .

  As shown in FIG. 3, the heat transfer tube 11 and the header tube 28 are connected in a state where the tip end portion of the end portion 17 a of the inner tube 17 of the heat transfer tube 11 is inserted into the header tube 28. . The connecting portion 29 is covered with a covering material 22 made of silicon, and a sheath 23 made of aluminum and having a cylindrical short tube shape is provided on the outer periphery of the covering material 22.

  Next, a method for manufacturing the heat exchanger 10 for air conditioning equipment according to the first embodiment of the present invention will be described.

  First, the heat transfer tubes 11 are inserted into the holes of the fins 13 by a conventional well-known pipe expansion and press-fitting method, and a large number of fins 13 are arranged on the outer surface of the heat transfer tubes 11 so that the heat transfer tubes 11 are supported by the casing 15.

  Next, the connection work between the heat transfer pipe 11 and the joint pipe 12 is performed. In this connection work, first, as shown in FIG. 4, the outer tubes 18 at both ends of each adjacent heat transfer tube 11 are removed to widen the tip portions, and the outer tubes 20 at both ends of the joint tube 12. Remove. Then, as shown by the arrow in FIG. 4, the sheath tube 23 is inserted into the heat transfer tube 11.

  Next, as shown in FIG. 5, the end portion of the inner tube 19 of the joint tube 12 is fitted to the tip portion of the end portion 17 a of the inner tube 17 of the heat transfer tube 11 with the sheath tube 23 being loosely fitted to the heat transfer tube 11. 19a is inserted and the front-end | tip part of the inner tube | pipe 17 of the heat exchanger tube 11 and the outer peripheral surface of the inner tube | pipe 19 of the joint pipe 12 are brazed and joined (refer FIG. 2). Thereafter, a connecting portion 21 between the inner pipe 17 of the heat transfer pipe 11 and the inner pipe 19 of the joint pipe 12 is covered with a covering material 22.

  Furthermore, as shown by the arrows in FIG. 6, the sheath tube 23 is slid along the heat transfer tube 11 and moved to the outer periphery of the covering material 22, and the excess covering material 22 protruding from the sheath tube 23 is removed. Thereafter, both ends of the sheath tube 23 are sealed with the same silicon sealing material 30 as the covering material 22. Thereby, as shown in FIG. 2, the connection work of the heat exchanger tube 11 and the joint pipe 12 is completed.

  Next, connection work between the heat transfer tube 11 and the header tube 28 is performed. In this connection operation, first, the outer tubes 18 at both ends of the heat transfer tube 11 are removed, and the sheath tube 23 is inserted into the heat transfer tube 11 and is loosely fitted to the heat transfer tube 11. In this state, the distal end portion of the end portion 17a of the inner tube 17 of the heat transfer tube 11 is inserted into the header tube 28, and the distal end portion of the header tube 28 and the outer peripheral surface of the inner tube 17 of the heat transfer tube 11 are brazed and joined. To do. Thereafter, the connecting portion 29 between the inner tube 17 and the header tube 28 of the heat transfer tube 11 is covered with the covering material 22. Furthermore, after the sheath tube 23 is slid along the heat transfer tube 11 and moved to the outer periphery of the covering material 22, the excess covering material 22 protruding from the sheath tube 23 is removed, and then both ends of the sheath tube 23 are covered with the covering material 22. Seal with the same silicon sealing material. Thereby, as shown in FIG. 3, the connection work of the heat exchanger tube 11 and the header tube 28 is completed.

  Next, a heat exchanger 20 for an air conditioning facility according to a second embodiment of the present invention will be described with reference to FIGS. Here, FIG. 7 is a plan view showing the overall configuration of the heat exchanger 40 for air conditioning equipment according to the second embodiment of the present invention, and FIG. 8 shows the heat for air conditioning equipment according to the second embodiment of the present invention. 4 is a cross-sectional view showing a main part of the exchanger 40. FIG. In the following description, the vertical and horizontal directions will be described based on the direction shown in FIG. 7 for convenience.

  As shown in FIG. 7, the heat exchanger 40 for air conditioning equipment according to the second embodiment of the present invention includes a large number of heat transfer tubes 41 formed in a straight line and both end portions of each heat transfer tube 41. A direct expansion coil 44 constituted by a joint pipe 42 as a heat exchanger member connected to each other and a large number of fins 43 arranged in parallel on the outer surface of the heat transfer pipe 41, and a casing 45 that supports the direct expansion coil 44. And a header 46 to which each heat transfer tube 41 is connected, and a distributor 48 to which each heat transfer tube 41 is connected via a capillary tube 47.

  The heat transfer tube 41 is configured by a double tube (clad tube) in which an inner tube 49 made of copper is covered with an outer tube 50 made of aluminum. The joint pipe 42 is a U-bent bent in a U-shape, and is constituted by a double pipe (clad pipe) in which an inner pipe made of copper (not shown) is covered with an outer pipe 51 made of aluminum.

  In addition, the heat transfer tube 41, the joint pipe 42, the fin 43, the casing 45, and the header 46 in the present embodiment are the heat transfer tubes 11 in the heat exchanger 10 for air conditioning equipment according to the first embodiment of the present invention described above. , The joint pipe 12, the fins 13, the casing 15, and the header 16, the detailed description thereof is omitted.

  The capillary tube 47 is made of stainless steel (SUS) and has a cylindrical shape that is narrower than the inner tube 49 of the heat transfer tube 41. The distributor 48 is made of stainless steel (SUS).

  As shown in FIG. 8, the capillary tube 47 is connected to the inner tube 49 of the heat transfer tube 41 through a copper reducer tube 53, and the connecting portion 54 is covered with a coating material 55 made of silicon. A sheath 56 made of aluminum and having a cylindrical short tube shape is provided on the outer periphery of the covering material 55.

  Next, a method for manufacturing the heat exchanger 40 for air-conditioning equipment according to the second embodiment of the present invention will be described.

  First, the heat transfer tubes 41 are inserted into the holes of the fins 43 by a conventional well-known pipe expansion and press-fitting method.

  Next, the connection work between the heat transfer pipe 41 and the joint pipe 42 and the connection work between the heat transfer pipe 41 and the header 46 are performed. These connection work are the air conditioning equipment according to the first embodiment of the present invention described above. Since it is the same as that of the case of the heat exchanger 10 for an operation, description is abbreviate | omitted.

  Next, connection work between the heat transfer tube 41 and the capillary tube 47 is performed. In this connection work, first, the outer tubes 50 at both ends of the heat transfer tube 41 are removed, the tip portions thereof are widened, and the sheath tube 56 is inserted into the heat transfer tube 41.

  Next, in a state where the sheath tube 56 is loosely fitted to the heat transfer tube 41, the large diameter portion 53 a of the reducer tube 53 is inserted into the distal end portion of the end portion 49 a of the inner tube 49 of the heat transfer tube 41, and the reducer tube 53 The tip portion of the capillary tube 47 is inserted into the small diameter portion 53b. Then, the distal end portion of the inner tube 49 of the heat transfer tube 41 and the outer peripheral surface of the reducer tube 53, and the distal end portion of the small diameter portion 53b of the reducer tube 53 and the outer peripheral surface of the capillary tube 47 are joined by brazing. Thereafter, the inner tube 49 of the heat transfer tube 41 and the reducer tube 53 and the connecting portion 54 of the reducer tube 53 and the capillary tube 47 are covered with a covering material 55.

  Further, the sheath tube 56 is slid along the heat transfer tube 41 and moved to the outer periphery of the covering material 55, and the excess covering material 55 protruding from the sheath tube 56 is removed. Thereafter, both ends of the sheath tube 56 are sealed with the same silicon sealing material (not shown) as the covering material 55. Thereby, as shown in FIG. 8, the connection operation of the heat transfer tube 41 and the capillary tube 47 is completed.

  As described above, according to the heat exchangers 10 and 40 for air conditioning equipment according to the first and second embodiments of the present invention, the outer pipes 20 and 51 made of aluminum are connected to the joint pipes 12 and 42 (U vent). By using the coated double pipe (clad pipe), the corrosion resistance of the joint pipes 12 and 42 can be improved.

  Further, the connecting portions 21, 29, 54 of the inner pipes 17, 49 of the heat transfer pipes 11, 41 and the heat exchanger members such as the inner pipe 19 of the joint pipes 12, 42, the header pipe 28 and the reducer pipe 53 are made of silicon. Since it covers with the coating materials 22 and 55 made from, the corrosion resistance of the connection parts 21, 29, and 54 can be improved.

  Furthermore, by providing the sheaths 23 and 56 made of aluminum on the outer periphery of the covering materials 22 and 55, the possibility that the connecting portions 21, 29, and 54 are exposed to the corrosive environment is limited to the end portions of the sheaths 23 and 56. Therefore, the corrosion resistance of the connection portions 21, 29, and 54 can be reliably increased by sealing both ends of the sheath tubes 23 and 56.

  Furthermore, there is a concern that the organic acid gas permeates into the silicon resin by about several microns. As shown in FIG. 2, the double pipe (clad pipe) outer pipes 18 and 20 and the sheath pipe 23 By providing the overlap length L3 of about 10 mm and ensuring the thickness of the covering material 22, the risk of corrosion of the connecting portion 21 can be reliably avoided. In addition, the silicone resin is excellent in stretchability, so that the service life of the water coil 14 and the direct expansion coil 44 can be extended to 15 years or more, and the durability can be improved.

Further, for example, as shown in Table 1, when compared with a directly expanded coil (air volume: 16,200 m ³ / h, heat amount: 24.5 kW) having the same cooling capacity, the second embodiment of the present invention is used. The air conditioner heat exchanger 40 has an excellent organic acid resistance performance compared to the conventional heat exchanger adopting a copper tube and an aluminum fin, and the coil volume increases by about 5%, but is almost equivalent. Coils can be manufactured in size. Further, the heat exchanger 40 for air conditioning equipment according to the second embodiment of the present invention has the same level of resistance as a conventional heat exchanger that employs stainless steel (SUS304, SUS316) tubes and aluminum fins. A significant reduction in coil volume and coil weight can be achieved while having organic acid performance.

  Moreover, since the coating materials 22 and 55 made of silicon have fluidity, it has been difficult to form a uniform coating thickness by dripping during construction and fixing until now. As described above, according to the method for manufacturing the heat exchangers 10 and 40 for the air conditioning equipment according to the first and second embodiments of the present invention, the sheaths 23 and 56 can be used to easily and uniformly cover the air. Thickness can be secured and workability can be improved.

  In the first and second embodiments described above, the case where the present invention is applied to a plate fin coil has been described. However, this is merely an example, and the present invention is a heat for air conditioning equipment other than the plate fin coil. Needless to say, the present invention can also be applied to an exchange.

  Moreover, in the manufacturing method of the heat exchangers 10 and 40 for air conditioning equipment described above, when joining the heat transfer tubes 11 and 41 and the heat exchanger members, the sheath tubes 23 and 56 are loosely fitted to the heat transfer tubes 11 and 41 side. However, this is merely an example, and at this time, the sheath tubes 23 and 56 may be loosely fitted to the heat exchanger member side.

  Moreover, since description of embodiment of this invention mentioned above has demonstrated the preferred embodiment in the heat exchanger for air-conditioning equipment which concerns on this invention, when the technically preferable various restrictions are attached | subjected However, the technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. That is, the above-described components in the embodiment of the present invention can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention described above does not limit the contents of the invention described in the claims.

10 Heat Exchanger for Air Conditioning Equipment 11 Heat Transfer Tube 12 Joint Tube (Heat Exchanger Member)
16 Header 17 Inner pipe (of heat transfer pipe) 18 Outer pipe (of heat transfer pipe) 19 Inner pipe (of joint pipe) 20 Outer pipe of (joint pipe) 21 Connection portion 22 Cover material 23 Sheath pipe 28 Header pipe (for heat exchanger) Element)
29 Connection Portion 40 Heat Exchanger for Air Conditioning Equipment 41 Heat Transfer Tube 42 Joint Tube (Heat Exchanger Member)
47 Capillary tube (heat exchanger component)
49 Inner pipe (of the heat transfer pipe) 50 Outer pipe (of the heat transfer pipe) 51 Outer pipe (of the joint pipe) 54 Connection portion 55 Covering material 56 Sheath pipe

Claims (5)

A heat transfer pipe constituted by a double pipe in which an inner pipe made of copper is coated with an outer pipe made of aluminum;
A heat exchanger member connected to an end of the inner tube of the heat transfer tube;
A coating material made of silicon that covers a connection portion between the exposed end portion of the inner tube of the heat transfer tube and the heat exchanger member;
An aluminum sheath tube provided on the outer periphery of the covering material;
Prepared ,
The heat transfer tube is a straight tube,
The heat exchanger member is a joint pipe connecting adjacent straight pipes,
The joint pipe is constituted by a double pipe in which an inner pipe made of copper is coated with an outer pipe made of aluminum,
The coating material exposed end and air conditioning heat exchanger, characterized that you cover the connection portion between the exposed end of the inner tube of the joint pipe of the inner tube of the straight pipe. Before Stories heat exchanger member further comprises a stainless steel header pipe connected to the header,
The air conditioner heat exchanger according to claim 1, wherein the covering material covers a connection portion between the exposed end portion of the inner pipe of the straight pipe and the end portion of the header pipe. A heat transfer pipe constituted by a double pipe in which an inner pipe made of copper is coated with an outer pipe made of aluminum;
A heat exchanger member connected to an end of the inner tube of the heat transfer tube;
A coating material made of silicon that covers a connection portion between the exposed end portion of the inner tube of the heat transfer tube and the heat exchanger member;
An aluminum sheath tube provided on the outer periphery of the covering material;
Prepared,
The heat transfer tube is a straight tube for a direct expansion coil,
The heat exchanger member is a stainless steel capillary tube for a direct expansion coil,
The dressing air conditioning heat exchanger equipment you characterized by covering the connecting portion between the end portion of the capillary tube and the end portion exposed in the inner tube of the straight pipe. A method of manufacturing a heat exchanger for an air conditioner that connects an exposed end portion of a heat transfer tube in which an outer tube made of aluminum is covered with a copper inner tube and a member for a heat exchanger,
The exposed end portion of the inner tube of the heat transfer tube and the end portion of the heat exchanger member are joined in a state in which an aluminum sheath tube is loosely fitted to either one of the heat transfer tube and the heat exchanger member. A process of
Coating the connecting portion between the inner tube of the heat transfer tube and the heat exchanger member with a coating material made of silicon;
Sliding the sheath tube along the heat transfer tube or the heat exchanger member and moving it to the outer periphery of the covering material;
The manufacturing method of the heat exchanger for air-conditioning equipment characterized by having.   The method for manufacturing a heat exchanger for an air conditioner according to claim 4, further comprising a step of sealing both ends of the sheath tube after the sheath tube is moved to the outer periphery of the covering material. .

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