JPH0741260U - Heat exchanger - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] When used as an evaporator, it achieves greater cooling capacity with an evaporator of the same size, and when used as a condenser, it does not prevent ventilation of the radiator. A structure heat exchanger is provided. [Structure] In a heat exchanger having a serpentine-bent flat tube 1 and a corrugated fin 2 inserted between the straight tube portions 1a of the flat tube 1, the refrigerant exits an inlet header pipe 3 and a large amount of evaporation causes supercooling. While increasing the bending pitch P1 of the flat tube 1 in the portion that tends to become thick, the pitch of the corrugated fins 2 was also widened to prevent frost from forming. Also, when using this heat exchanger as a condenser, if there is a portion that overlaps with the radiator due to the installation space, etc., increase the bending pitch of the flat tube 1 at that portion to reduce the ventilation volume to the radiator. To prevent the radiator water temperature from rising.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger, and more particularly, to a flat tube bending structure of a serpentine heat exchanger for automobile air conditioning.

[0002]

[Prior art]

 Conventionally, heat exchangers have been used for air conditioning of automobiles. FIG. 4 is a perspective view showing a conventional heat exchanger. As shown in this figure, a serpentine type heat exchanger 50 includes an inlet header 53 and an outlet header 54, and a meandering heat transfer tube 51 connecting the inlet header 53 and the outlet header 54. The heat transfer tube 51 is constituted by heat radiating corrugated fins 60 interposed in respective portions. The heat exchanger 50 is forcibly ventilated rearward from the front in FIG. 2 by a cooling fan or the like not shown. The refrigerant flows from the inlet header 53 to the outlet header 54 through the heat transfer tube 51. At that time, the heat of the heat medium is radiated from the wall of the heat transfer tube 51 through the radiating corrugated fins 60. The bending pitch of the heat transfer tube 51 used in the heat exchanger 50 for air conditioning of an automobile having such a structure is unified in terms of processing.

[0003]

[Problems to be solved by the device]

 However, conventionally, when it is used as an evaporator, the fin pitch is widened in the region where frost is easily formed on the refrigerant inlet side, and when it is used as a condenser, it overlaps with a radiator (not shown). This was dealt with by increasing the fin pitch to reduce the wind loss of the. However, this is not a sufficient countermeasure, and there is a problem that the radiator water temperature rises due to partial frosting of the evaporator and windage of the condenser.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional technology and to use it as a condenser without causing frost formation during operation to concentrate on the refrigerant inlet side of the evaporator. Is to provide a heat exchanger that is less likely to cause windage damage to the radiator.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention reduces the bending pitch of a flat tube used in a heat exchanger to a portion to be cooled more when used as an evaporator, and a refrigerant which is easily frosted. I made it bigger near the entrance. In addition, when used as a condenser, the flat pipe has a large bending pitch so that the ventilation volume does not decrease in the part that overlaps with the radiator.

[0006]

[Action]

 According to the present invention, since the flat tubes used in the heat exchanger are configured with a plurality of bending pitches, when used as an evaporator, the frosting limit is improved and the same size evaporator has a larger cooling capacity. Can be pulled out. Also, when used as a condenser, the bending pitch of the portion that overlaps with the radiator is increased, so the ventilation volume does not decrease, and the rise in radiator water temperature can be suppressed.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an example in which the heat exchanger according to the present invention is used as an evaporator, in which 1 denotes a serpentine bent flat tube, and the straight tube portions 1a, 1a ... A corrugated fin 2 is brazed to 1a. This type of heat exchanger is manufactured by bending the tube 1 serpentine so that the straight pipe portion 1a and the curved pipe portion 1b are continuous, and brazing the corrugated fins 2 to the straight pipe portion 1a. Due to the characteristics of the serpentine evaporator, the vicinity of the refrigerant inlet is well cooled, and because of this structure, frost easily forms in places where it is difficult for the wind to pass. Therefore, in this embodiment, the refrigerant flows through the inlet header pipe 3. In addition to increasing the bending pitch P1 of the flat tube 1 in the portion where a large amount of vapor is emitted and is likely to be supercooled, the pitch of the corrugated fins 2 is also widened to prevent frost formation. In this embodiment, the flat tube 1 has two bending pitches P1 and P2. However, if there is a portion to be cooled further, the bending pitch of the flat tube 1 at that portion may be set to P3 (P2> P3). . When the heat exchanger according to the present invention is used as a condenser, if there is a portion that overlaps with the radiator due to the installation space, etc., the bending pitch of the flat tube 1 at that portion may be increased. As a result, it is possible to prevent a decrease in the air flow to the radiator and prevent an increase in radiator water temperature.

[0008]

[Effect of device]

 As described above, according to the present invention, since the bend pitch of the serpentine bent flat tube used in the heat exchanger is composed of a plurality of bend pitches, when the flat tube is used as an evaporator, Also, since it is difficult for frost to form on the surface of the corrugated fins, a larger cooling capacity can be obtained with the same size evaporator. Further, when the flat tube is used as a condenser, the bending pitch of the portion overlapping with the radiator can be increased, so that the amount of air that hits the surface of the radiator does not decrease, and the rise in the radiator water temperature can be suppressed.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a heat exchanger according to the present invention.

FIG. 2 is a front view showing an embodiment of a heat exchanger according to the present invention.

FIG. 3 is an embodiment showing the end portion of the flat pipe according to the present invention from the insertion portion side into the header pipe.

FIG. 4 is a perspective view showing a conventional heat exchanger.

FIG. 5 is a perspective view showing a conventional corrugated fin.

[Explanation of symbols]

 1 Flat pipe 1a Straight pipe portion 1b Curved pipe portion 2 Corrugated fin 3 Inlet header pipe 4 Outlet header pipe P1 Flat pipe bending pitch (large) P2 Flat pipe bending pitch (medium) P3 Flat pipe bending pitch (small) NX Number of bending pitches of flat tubes 5 Refrigerant inlet pipe 6 Refrigerant outlet pipe 50 Heat exchanger 51 Heat transfer tube 53 Inlet header 54 Outlet header 60 Corrugated fin

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger having a serpentine-bent flat tube, header pipes connected to both ends of the flat tube, and corrugated fins inserted between straight tube portions of the flat tube, wherein A heat exchanger having a plurality of bending pitches.