JP2019100563A - Heat exchanger and refrigeration system using the same - Google Patents

Abstract

To provide a heat exchanger improved in corrosion resistance in a joint portion between plate fins, and a refrigeration system using the same.SOLUTION: A plate fin 2a is formed by joining an annular protrusion part 16 for a header flow passage and a pair of plate-like members 6a, 6b including a recess groove for a heat transfer flow passage. The plate fin 2a forms a sacrificial anticorrosive layer 14 on the surface side, and a folding piece 16a is provided at a tip portion of the annular protrusion part 16, and by folding of the folding piece 16a, non-sacrificial anticorrosive faces which become the surface side are integrally joined while facing with each other. Thereby, the annular protrusion part which is integrally joined with the plate fins reduces the risk of corrosion as a joint of non-sacrificial anticorrosive surfaces with each other, while the surface on the surface side of the plate fin where condensate water generates maintains corrosion resistance as a surface with the sacrificial anticorrosive layer. Thus, corrosion resistance can be improved.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a heat exchanger and a refrigeration system using the same, and more particularly to a plate-fin stack type heat exchanger configured by laminating plate-like plate fins through which refrigerant flows, and a refrigeration system using the same.

  Generally, a refrigeration system such as an air conditioner or a refrigerator circulates the refrigerant compressed by the compressor to a heat exchanger such as a condenser or an evaporator and exchanges heat with the second fluid to perform cooling or heating. The heat exchange efficiency of the heat exchanger greatly affects the system performance and energy saving performance. Therefore, high efficiency is strongly required for heat exchangers.

  Under such circumstances, the heat exchanger of the refrigeration system generally uses a finned tube heat exchanger configured by allowing a fin group to penetrate a heat transfer pipe, and the diameter reduction of the heat transfer pipe In order to improve the heat exchange efficiency and to miniaturize the

  However, since the diameter reduction of the heat transfer tube is limited, improvement and miniaturization of heat exchange efficiency are approaching their limits.

  On the other hand, among heat exchangers used for exchanging heat energy, a plate fin laminated type heat exchanger is known in which plate fins having refrigerant channels are laminated.

  This plate fin laminated type heat exchanger performs heat exchange between the refrigerant flowing in the refrigerant flow path formed in the plate fins and the second fluid flowing between the laminated plate fins, and is used for vehicles. It is widely used in an air conditioner (see Patent Document 1).

  FIG. 12 and FIG. 13 show the plate-fin laminated type heat exchanger described in Patent Document 1 described above, and this heat exchanger 100 is a plate-fin laminated body 103 in which plate fins 102 having a flow path 101 for refrigerant flow are laminated. End plates 104 are stacked on both sides, and an inlet side header channel 105 and an outlet side header channel 106 are formed at both left and right ends of the channel 101.

  The plate fins 102 are constructed by joining a pair of plate-like members provided with a concave groove to be the flow channel 101 and an annular projecting portion 107 to be the inlet side header flow channel 105 and the outlet side header flow channel 106, The plate fins 102 are joined together by abutting their annular projections 107.

Utility model registration number 3192719 gazette

  In the plate fin laminated type heat exchanger described in Patent Document 1 described above, the recessed groove is press-formed in the plate-like member to be the plate fin 102 to form the flow path 101, so the cross-sectional area of the flow path 101 is finned. It can be made smaller than a tube type heat transfer tube, and heat exchange efficiency can be enhanced.

  However, in the plate fin laminated type heat exchanger of the above configuration, corrosion proceeds from the butt joint portion between the annular projecting portions 107 of the inlet side header channel 105 and the outlet side header channel 106 which join the plate fins 102 to each other. In the worst case, there was a problem that perforation occurred.

  That is, generally, the heat exchanger is made of aluminum and the plate fins 102 are formed, and the plate fins 102 have a sacrificial anticorrosive layer formed on the side on which the condensed water is generated, ie, the surface side of the plate fins 102. is there. Therefore, as shown in an enlarged manner in FIG. 12A, bonding of the annular projecting portions 107 of the plate fins 102 is performed through the sacrificial anticorrosive layer 109, and particularly in the salt-affected area etc. Corrosion may progress from the joint portion between the portions 107 to cause perforation.

  The present invention was made in view of such a point, and it aims at offer of a heat exchanger which raised corrosion resistance in a joined part of plate fins, and improved corrosion resistance, and a refrigeration system using it. It is.

  In order to achieve the above object, the present invention joins a pair of plate-like members provided with an annular protrusion for a header channel and a concave groove for a heat transfer channel connected to the header channel to form a plate fin. The plate fins form a sacrificial anticorrosive layer on the surface side, and provide a folded piece at the tip of the annular protrusion, and fold the non-sacrificial anticorrosive surfaces that become the surface side by folding the folded piece. Plate fins are integrally laminated.

  Thereby, the surface on the surface side of the plate fin on which heat exchange is performed with the refrigerant flowing through the heat transfer channel to generate condensed water is maintained by the sacrificial anticorrosive layer while maintaining corrosion resistance, and joining of the annular projections joining the plate fins The portion can suppress corrosion as a joint between non-sacrificial anti-corrosion surfaces and can be a heat exchanger having high corrosion resistance.

  ADVANTAGE OF THE INVENTION this invention can be used as the heat exchanger with high corrosion resistance, and the highly durable refrigeration system using the same by said structure.

An external perspective view of a heat exchanger according to Embodiment 1 of the present invention An exploded perspective view showing the same heat exchanger in a separated state The perspective view which shows the fin laminated body of the same heat exchanger An enlarged perspective view showing an annular protrusion for forming a head flow passage provided on a fin plate of the same heat exchanger The enlarged perspective view which shows the joined part of the annular projection part for the same head channel formation The schematic cross section which shows the junctional part of the annular projection part for the same head channel formation An enlarged sectional view of a plate-like member which constitutes a plate fin of the same heat exchanger Plan view of plate fins that constitute the same heat exchanger An exploded view showing a partially enlarged view of the configuration of plate fins that constitute the heat exchanger Refrigeration cycle diagram of an air conditioner shown as an example of a refrigeration system in a second embodiment using the heat exchanger of the present invention Schematic cross section of the air conditioner Cross-sectional view of a conventional plate fin laminated type heat exchanger Plan view of plate fins in the plate fin laminated type heat exchanger of the related art

  According to a first aspect of the present invention, a plate fin is formed by joining a pair of plate-like members provided with an annular protrusion for a header flow channel and a concave groove for a heat transfer flow channel connected to the header flow channel. A sacrificial anticorrosive layer is formed on the surface side, and a folded piece is provided at the tip of the annular projection, and non-sacrificial anticorrosion surfaces that become the surface side are joined facing each other by folding the folded piece to laminate plate fins As an integrated structure.

  Thereby, the surface on the surface side of the plate fin on which heat exchange is performed with the refrigerant flowing through the heat transfer channel to generate condensed water is maintained by the sacrificial anticorrosive layer while maintaining corrosion resistance, and joining of the annular projections joining the plate fins The portion can suppress corrosion as a joint between non-sacrificial anti-corrosion surfaces and can be a heat exchanger having high corrosion resistance.

  In a second invention according to the first invention, the plate-like member forming the plate fins is coated with a brazing material on both sides including the surface on which the sacrificial anticorrosive layer is provided.

  Thereby, the brazing operation at the time of joining of a pair of plate-like members and joining of plate fins becomes easy, and the workability of brazing can be improved.

  A third invention is a refrigeration system, and the refrigeration system uses a heat exchanger constituting a refrigeration cycle as the heat exchanger according to any one of the first and second inventions.

  As a result, the corrosion resistance of the heat exchanger is high, so a refrigeration system with high durability can be obtained.

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

Embodiment 1
FIG. 1 is an external perspective view of a heat exchanger according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view showing the heat exchanger in a separated state, and FIG. 3 is a perspective view showing a fin laminate of the heat exchanger. FIG. 4 is an enlarged perspective view showing a head channel forming annular projection provided on a fin plate of the same heat exchanger, and FIG. 5 (a) is an enlarged view showing a joint portion of the head channel forming annular projection FIG. 8 is an enlarged schematic cross-sectional view showing a joint portion of the annular projection for forming the head channel, FIG. 7 is an enlarged cross-sectional view of a plate-like member which constitutes a plate fin of the heat exchanger, FIG. The top view of the plate fin which comprises the same heat exchanger, FIG. 9 is an exploded view which expands and shows a part of structure of the plate fin which comprises the same heat exchanger.

  1 to 9, the heat exchanger 1 of the present embodiment is disposed on both sides (upper and lower sides in FIG. 1) of the plurality of plate fins 2a having a rectangular plate shape and the plate fins 2a. Provided with the end plates 3a and 3b, and the end plates 3a and 3b on both sides are connected and fixed by fastening means 7 such as bolts, and when used as an evaporator, they function as an inlet and when used as a condenser It has a tube A4 to be an outlet and a tube B5 to be the opposite.

  As described later, the plate fins 2a have a plurality of parallel heat transfer flow paths in which the refrigerant, which is the first fluid, flows, as described later, and the heat transfer flow paths are formed in a substantially U shape. The tubes A4 and B5 connected thereto are collectively disposed on one end side of the end plate 3a on one side (left side in FIG. 2) of the plate fin laminate 2.

More specifically, as shown in FIG. 8, the plate fins 2a form a plurality of parallel heat transfer channels (hereinafter referred to as refrigerant channels) 11 and a header channel A8 and a header channel B10 connected thereto. A plurality of refrigerant channels 11 are formed substantially in a U-shape and connected to each other to form a header channel A8. The plurality of refrigerant channels 11 are formed by brazing so as to face each other with the pair of plate members 6a and 6b (see FIG. 9) facing each other. And the header channel B10 are gathered at one end side.

  And as shown in FIG. 3, many plate fins 2a of the said structure are laminated | stacked, and the plate fin laminated body 2 which makes the main body of a heat exchanger is comprised, The said plate fin is comprised between each plate fins 2a. A plurality of protrusions 12 (see FIG. 8) appropriately provided between the long side end portions 2a and the refrigerant flow path 11 form a gap through which air as the second fluid flows.

  As shown in FIG. 7, the pair of plate members 6a and 6b that constitute the plate fins 2a of the plate fin laminate 2 configured in this way is the surface side of the plate members 6a and 6b that constitute the plate fins 2a. While providing the sacrificial anticorrosive layer 14 on one side which becomes, it is set as the clad board which covered the both sides including the field which gave the sacrificial anticorrosive layer 14 with the brazing material 15.

  The pair of plate members 6a and 6b are for header flow channels A8 and B10 from the non-sacrificial anti-corrosion surface side opposite to the surface on the sacrificial anti-corrosion layer 14 side toward the surface on the sacrificial anti-corrosion layer 14 side. When the plate fin 2a is configured by providing the annular protrusion 16 and joining the pair of plate members 6a and 6b, the outer surface, that is, the surface on which the air flows is the sacrificial anticorrosive layer 14 It is a face.

  Further, as shown in FIGS. 4 to 6, the pair of plate-like members 6a and 6b is provided with a turn-up piece 16a at the tip of the annular projecting portion 16, and the turn-up toward the front side by the turn-up. The plate fins 2a are laminated and integrated by joining the non-sacrificial anti-corrosion faces of the pieces 16a so as to face each other.

  Among the refrigerant channels 11, heat is generated between the header channel A side refrigerant channel 11a connected to the header channel A8 and the header channel B side refrigerant channel 11b connected to the header channel B10. Slit grooves 18 (see FIG. 9) are formed to prevent movement.

  Further, in this example, the number of the header flow passage B side refrigerant flow passage 11b is increased, and as shown in FIG. 9, the portion facing the communication flow passage 19 of the header flow passage B10 is a non-porous portion 20 without a refrigerant flow passage. The refrigerant flowing from the header flow passage B10 on the inlet side to the header flow passage B side refrigerant flow passage 11b when using the condensing condition collides with the wall portion of the non-porous portion 20 and is sent to the header flow passage B side refrigerant flow passage 11b It is configured to flow evenly.

  The effects of the air conditioner configured as described above will be described below.

  In the plate fin laminated type heat exchanger according to the present embodiment, the refrigerant flows U-turn in parallel in the longitudinal direction of the refrigerant flow paths 11 in each of the plate fins 2 a of the plate fin laminated body 2 to return the header flow path A 8 or It is discharged from the header channel B10 through the pipe A4 or the pipe B5.

  On the other hand, the air passes through the gap formed between the laminations of the plate fins 2 a constituting the plate fin laminated body 2. Thereby, heat exchange between the refrigerant as the first fluid and the air as the second fluid is performed.

  Here, since the surface of the plate fins 2a on the sacrificial anticorrosion layer 14 side is located on the surface side on which the air flows, it is a salt-damaged place etc. and exchanges heat with the refrigerant flowing in the refrigerant channel 11 on its surface. Even if condensed water may be generated, corrosion by this condensed water can be prevented.

Further, since the plate fins 2a are formed by folding the end portions of the annular projecting portion 16 and joining the non-sacrificial anti-corrosion faces of the folded pieces 16a to each other and joining them together, the sacrificial anticorrosive layer It is possible to prevent the progress of corrosion caused by the presence of H. It is possible to reliably prevent corrosion over a long period of time.

  That is, the surface on the surface side of the plate fin 2a where heat exchange is performed with the refrigerant flowing through the refrigerant channel 11 to generate condensed water, while maintaining the corrosion resistance by the sacrificial anticorrosive layer 14, the annular projection obtained by joining and integrating the plate fins 2a The joint portion 16 can suppress corrosion as a joint between non-sacrificial anti-corrosion surfaces to improve corrosion resistance.

  Further, since the plate-like members 6a and 6b constituting the plate fins 2a are covered with the brazing material 15 on both sides including the surface to which the sacrificial anticorrosive layer 14 is applied, bonding of the pair of plate-like members 6a and 6b and The brazing operation at the time of joining the plate fins 2a becomes easy, and the workability of brazing can be improved.

Second Embodiment
The second embodiment is a refrigeration system configured using the heat exchanger according to the first embodiment described above.

  FIG. 10 is a refrigeration cycle diagram of an air conditioner shown as an example of a refrigeration system, and FIG. 11 is a schematic cross-sectional view showing an indoor unit of the air conditioner.

  In FIG. 10 and FIG. 11, the air conditioner is composed of an outdoor unit 51 and an indoor unit 52 connected to the outdoor unit 51. The outdoor unit 51 includes a compressor 53 for compressing the refrigerant, a four-way valve 54 for switching the refrigerant circuit during the cooling and heating operation, an outdoor heat exchanger 55 for exchanging heat between the refrigerant and the outside air, a decompressor 56 for decompressing the refrigerant, and the outdoor A blower 59 is provided. Further, the indoor unit 52 is provided with an indoor heat exchanger 57 for exchanging heat between the refrigerant and the indoor air, and an indoor blower 58. The compressor 53, the four-way valve 54, the indoor heat exchanger 57, the decompressor 56, and the outdoor heat exchanger 55 are connected by a refrigerant circuit to form a heat pump type refrigeration cycle.

  In the refrigerant circuit according to the present embodiment, a refrigerant in which tetrafluoropropene or trifluoropropene, difluoromethane or pentafluoroethane or tetrafluoroethane is used singly or in combination of two components or three components is used.

  The air conditioner switches the four-way valve 54 such that the discharge side of the compressor 53 and the outdoor heat exchanger 55 communicate with each other during the cooling operation. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature and high-pressure refrigerant, and is sent to the outdoor heat exchanger 55 through the four-way valve 54. Then, it exchanges heat with the outside air, dissipates heat, becomes a high pressure liquid refrigerant, and is sent to the decompressor 56. The decompressor 56 is decompressed to be a low temperature and low pressure two-phase refrigerant, and is sent to the indoor unit 52. In the indoor unit 52, the refrigerant enters the indoor heat exchanger 57, exchanges heat with indoor air, absorbs heat, evaporates and evaporates, and becomes a low temperature gas refrigerant. At this time, the room air is cooled to cool the room. Further, the refrigerant is returned to the outdoor unit 51 and returned to the compressor 53 via the four-way valve 54.

  During the heating operation, the four-way valve 54 is switched so that the discharge side of the compressor 53 and the indoor unit 52 communicate with each other. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature and high-pressure refrigerant, passes through the four-way valve 54, and is sent to the indoor unit 52. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 57, exchanges heat with the indoor air, dissipates heat, is cooled, and becomes a high-pressure liquid refrigerant. At this time, the room air is heated to heat the room. Thereafter, the refrigerant is sent to the pressure reducer 56 and decompressed in the pressure reducer 56 to become a low temperature low pressure two phase refrigerant, sent to the outdoor heat exchanger 55, heat exchanged with the outside air, evaporated and vaporized, via the four-way valve 54 Then, it is returned to the compressor 53.

The air conditioner configured as described above is highly durable by using the highly corrosion resistant heat exchanger shown in the above embodiment for one or both of the outdoor heat exchanger 55 and the indoor heat exchanger 57. Can be a sex air conditioner.

  As mentioned above, although the heat exchange which concerns on this invention, and the refrigeration system using it were demonstrated using the said embodiment, this invention is not limited to this. That is, the embodiments disclosed herein are illustrative and non-restrictive in every respect, and the scope of the present invention includes all modifications within the meaning and scope equivalent to the claims. Intended.

  According to the present invention, the surface on the surface side where the condensed water is generated maintains corrosion resistance by the sacrificial anticorrosive layer, and the joint portion of the annular projecting portion joining and integrating the plate fins suppresses the corrosion as joining non-sacrificial anticorrosion surfaces It is possible to provide a highly corrosion resistant heat exchanger and a highly durable refrigeration system using the same. Therefore, it can be widely used for heat exchangers and various refrigeration devices used for household and commercial air conditioners, etc., and its industrial value is great.

DESCRIPTION OF SYMBOLS 1 heat exchanger 2 plate fin laminated body 2a plate fin 3a, 3b end plate 4 tube A
5 tube B
6a plate member 6b plate member 7 fastening means 8 header channel A
10 Header channel B
11 Refrigerant channel (first fluid channel)
11a header flow path A side refrigerant flow path 11b header flow path B side refrigerant flow path 12 protrusion (cut and raised projection)
14 sacrificial corrosion resistant layer 15 brazing material 16 annular protrusion 16a folded piece 17 concave groove 18 slit groove 19 connecting flow passage 20 non-porous portion

Claims (3)

A pair of plate-like members provided with an annular protrusion for the header flow channel and a concave groove for the heat transfer flow channel connected to the header flow channel are joined to form a plate fin, and the plate fin is a sacrificial anticorrosive layer on its surface side A heat exchanger comprising a plate fin and a non-sacrificial anti-corrosion surface facing each other facing each other by providing a folded back piece at the tip of the annular projection and folding back the folded back piece . The heat exchanger according to claim 1, wherein the plate-like member forming the plate fins is coated with a brazing material on both sides including the surface to which the sacrificial anticorrosive layer is applied. The refrigeration system which made the heat exchanger which comprises a refrigerating cycle the heat exchanger in any one of the said Claim 1 or 2.

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