JP2007017061A - Gas cooler for carbon dioxide air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas cooler for a carbon dioxide air conditioner, capable of reducing the thickness in air flowing direction of the whole body of heat exchange cores arranged in two lines. <P>SOLUTION: This gas cooler comprises a core in which fins and flat tubes 2a and 2b are alternately laminated and arranged in two lines, an inlet header tank and an output header tank extending in the laminating direction of the flat tubes 2a and 2b and connected to the end side of the core, respectively, and a turn-side header tank extending in the laminating direction of the flat tubes 2a and 2b and connected to the turn side of the core, the second flat tube 2a located on the downstream side of cooling air and the second flat tube 2b located on the upstream side of cooling air being arranged in an offset state. According to such a structure, interference of the flat tubes 2a and 2b with the header tanks can be avoided, and if the gap G between the flat tubes 2a and 2b is set to about 1 mm, a pair of distribution parts 11 and 12 can be separated at a joint part 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas cooler for a carbon dioxide air conditioner having heat exchange cores arranged in two rows.

As a thing relevant to this kind of prior art, the multiflow type heat exchanger described in patent document 1 is mentioned, for example. As shown in FIGS. 22 and 23, the flat tubes 2 forming the fins 1 and the refrigerant passages are alternately stacked, and the cores 3a and 3b arranged in two rows and the stacking direction of the tubes 2 are extended. An inlet header tank 4 and an outlet header tank 5 connected to the end portions of 3a and 3b, respectively, and a turn-side header tank 6 extending in the stacking direction of the tubes 2 and connected to the turn side of the cores 3a and 3b. ing. A refrigerant inlet pipe 7 and a refrigerant outlet pipe 8 are connected to the inlet header tank 4 and the outlet header tank 5, respectively.
Japanese Patent Application Laid-Open No. 2004-225961 (paragraph numbers 0015 to 0017, FIGS. 1 and 2)

  However, in the above-described patent document 1, a considerable gap is formed between the cores 3a and 3b in order to avoid interference between the flat tube 2 of the core 3a located on the downstream side of the cooling air and the outlet header tank 5. Therefore, there is a problem that the thickness dimension in the air flow direction of the entire cores 3a and 3b is increased.

  The present invention has been made in consideration of the above-described prior art, and the object thereof is a gas cooler for a carbon dioxide air conditioner capable of reducing the thickness of the entire heat exchange core arranged in two rows in the air flow direction. Is to provide.

  In order to achieve the above-mentioned object, the present invention provides a flat tube forming fins and a refrigerant passage which are alternately stacked, cores arranged in two rows, and extending in the stacking direction of the flat tubes, on the end side of the core. A gas cooler for a carbon dioxide air conditioner having an inlet header tank and an outlet header tank connected to each other, and a turn-side header tank extending in the stacking direction of the flat tubes and connected to the turn side of the core, wherein the flat tubes Is a first flat tube located on the downstream side of the cooling air and a second flat tube located on the upstream side of the cooling air, and the first flat tube and the second flat tube are arranged offset. It is.

  In the present invention configured as described above, since the first flat tube and the second flat tube located on the downstream side and the upstream side of the cooling air are arranged in an offset state, the flat tube and the header tank Interference and interference between flat tubes can be avoided. Thereby, since the space | interval between these flat tubes can be decreased, the thickness dimension of the air flow direction of the heat exchange core arrange | positioned in two rows can be reduced. Moreover, since the 1st flat tube and the 2nd flat tube are offset with respect to the ventilation direction of cooling air, the heat transfer rate of these flat tube outer surfaces and air can be improved.

  According to the present invention, it is possible to reduce the thickness of the entire heat exchange cores arranged in two rows in the air flow direction, and thus it is possible to reduce the thickness of the gas cooler for a carbon dioxide air conditioner.

  Hereinafter, details of a gas cooler for a carbon dioxide air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 6 show a gas cooler for a carbon dioxide air conditioner according to a first embodiment of the present invention. 1 to FIG. 6, the same reference numerals are given to those equivalent to the prior art shown in FIG. 22 and FIG.

  Compared with the prior art shown in FIGS. 22 and 23 described above, the gas cooler 10 for a carbon dioxide air conditioner of the present embodiment has a first flat tube 2a positioned on the downstream side of the cooling air and the cooling as shown in FIG. The second flat tube 2b positioned on the upstream side of the air is disposed in an offset state in the vertical direction, and the inlet header tank 4 connected to the end side of each of the cores 3a and 3b as shown in FIG. The difference is that the outlet header tank 5 is integrally formed, and other configurations are basically the same.

  The inlet header tank 4 and the outlet header tank 5 are composed of a tank portion 13 in which a pair of flow portions 11 and 12 through which a refrigerant flows is formed, and a plate portion 14 into which both end portions of the flat tubes 2a and 2b are inserted. The tank portion 13 and the plate portion 14 are joined to each other by brazing the joining portion 15 or the like.

  As shown in FIG. 6, the fin 1a is joined on the 1st flat tube 2a, and the fin 1b is joined on the 2nd flat tube 2b.

  In this first embodiment, when high-temperature carbon dioxide gas flows into the circulation part 11 of the inlet header tank 4 from the refrigerant inlet pipe 7, it passes through the first flat tube 2a (outward path) and moves to the right in FIG. 1 and flows into the turn side header tank 6 and flows into the second flat tube 2b (return path) via the communication path 16, and then flows in the second flat tube 2b to the left in FIG. The refrigerant flows out from the refrigerant outlet pipe 8 through the circulation part 12 of the outlet header tank 5. At this time, as shown in FIG. 5, since the cooling air passes through the cores 3b and 3a, the high-temperature carbon dioxide gas is cooled while passing through the second flat tube 2b and the first flat tube 2a.

  In the first embodiment configured as described above, the first flat tube 2a and the second flat tube 2b located on the downstream side and the upstream side of the cooling air are arranged in an offset state. Interference between the tubes 2a and 2b and the header tanks 4 and 5 and between the flat tubes 2a and 2b can be avoided. Even if the interval G between the flat tubes 2a and 2b is set to around 1 mm, the joint 15 Since the pair of circulation portions 11 and 12 can be separated, the thickness dimension D in the air flow direction of the entire heat exchange cores 2a and 2b arranged in two rows can be reduced.

  Moreover, in this 1st Embodiment, since the 1st flat tube 2a and the 2nd flat tube 2b are offset with respect to the ventilation direction of cooling air, these flat tubes 2a and 2b outer surface and air The heat transfer rate is improved and the cooling performance can be improved.

[Second Embodiment]
7 and 8 show a gas cooler for a carbon dioxide air conditioner according to the second embodiment of the present invention. 7 and FIG. 8, the same components as those shown in FIG. 1 to FIG. 6, FIG. 22 and FIG.

  As shown in FIGS. 7 and 8, in the gas cooler 17 for the carbon dioxide air conditioner of the present embodiment, compared with the first embodiment shown in FIGS. The difference is that the notch 18 is provided in the joint 15, and other configurations are basically the same.

  Even in the second embodiment configured as described above, the same effects as those of the first embodiment shown in FIGS. 1 to 6 can be obtained. Further, in the second embodiment, the area of the joint portion 15 is reduced by the notch hole 18, so that the outlet header tank 5 in which the low-temperature carbon dioxide gas flows from the circulation portion 11 of the inlet header tank 4 in which the high-temperature carbon dioxide gas flows. When heat conduction is performed to the circulation part 12 through the joint part 15, heat is hardly transmitted in the joint part 15, and the cooling performance of carbon dioxide gas can be further improved.

[Third Embodiment]
Moreover, the gas cooler for carbon dioxide air conditioners which concerns on the 3rd Embodiment of this invention is shown in FIGS. 9 to 14, the same components as those shown in FIGS. 1 to 8, 22 and 23 described above are denoted by the same reference numerals.

  As shown in FIGS. 9-14, in the gas cooler 20 for carbon dioxide air conditioners of this Embodiment, compared with 1st Embodiment shown in FIGS. 1-6 mentioned above, the 1st located in the upstream of cooling air. The bent portions 21 are formed by bending both ends of the flat tube 2b 2 (both ends of the tubes connected to the header tanks 5 and 6) by a half pitch of the tube pitch in the axial direction of the header tanks 5 and 6, respectively. The other configurations are basically the same.

  As shown in FIG. 12, the intermediate portions of the first flat tube 2a and the second flat tube 2b are arranged side by side. However, as shown in FIG. 13, the second flat shape with respect to the end of the first flat tube 2a. The end of the tube 2b is disposed in an offset state. Moreover, as shown in FIG. 14, the wide fin 1c is joined to the intermediate part of the 1st flat tube 2a and the 2nd flat tube 2b. The fin 1a is joined on the end of the first flat tube 2a, and the fin 1b is joined on the end of the second flat tube 2b.

  In the third embodiment, since the end portion of the second flat tube 2b is arranged in an offset state with respect to the end portion of the first flat tube 2a, the above-described FIGS. The same effects as those of the first embodiment shown in FIG.

  Even in the third embodiment, as in the second embodiment, if a notch is formed in the joint portion 15 between the tank portion 13 and the plate portion 14, the joint portion 15. Since heat becomes difficult to be transmitted from the circulation part 11 of the inlet header tank 4 to the circulation part 12 of the outlet header tank 5 through the carbon dioxide, the cooling performance of carbon dioxide gas can be further improved.

  Moreover, in the said 3rd Embodiment, although the case where the both ends of the 2nd flat tube 2b located in the upstream of cooling air were bent was illustrated, instead of the 2nd flat tube 2b, The same applies to the case of bending both ends of one flat tube 2a.

[Fourth Embodiment]
15 to 19 show a gas cooler for a carbon dioxide air conditioner according to the fourth embodiment of the present invention. 15 to FIG. 19, the same components as those shown in FIG. 1 to FIG. 14, FIG. 22 and FIG.

  As shown in FIGS. 15-19, in the gas cooler 22 for carbon dioxide air conditioners of this Embodiment, both ends of the 1st flat tube 2a compared with 1st Embodiment shown in FIGS. 1-6 mentioned above. (Both ends of the tubes connected to the header tanks 4 and 6) and both ends of the second flat tube 2b (both ends of the tubes connected to the header tanks 5 and 6) are arranged at intervals of two pitches. The first flat tube 2a and the second flat tube 2b are formed by bending one half of the tube pitch in the direction and bringing them to the ends of the adjacent flat tubes 2a and 2b to form bent portions 23 and 24. The other ends are basically the same, except that the end portions are offset.

  As shown in FIG. 18, the intermediate portions of the first flat tube 2a and the second flat tube 2b are arranged side by side. However, as shown in FIG. 17, the end of the first flat tube 2a and the second flat tube 2b are arranged. Are arranged in an offset state. Further, as shown in FIG. 19, wide fins 1c are joined to the first flat tube 2a and the second flat tube 2b.

  In this 4th Embodiment, since the edge part of the 1st flat tube 2a and the edge part of the 2nd flat tube 2b are arrange | positioned in the offset state, it shows in FIGS. 1-6 mentioned above. The same effect as the first embodiment can be obtained. Moreover, the shortest heat conduction distance 25 of the joint part 15 between the tank part 13 and the plate part 14 can be increased, and the heat conduction between the circulation part 11 of the inlet header tank 4 and the circulation part 12 of the outlet header tank 5 is suppressed. Therefore, the cooling performance can be improved.

[Fifth Embodiment]
20 and 21 show a gas cooler for a carbon dioxide air conditioner according to a fifth embodiment of the present invention. 20 and 21, the same components as those shown in FIGS. 1 to 19, 22 and 23 described above are denoted by the same reference numerals.

  As shown in FIGS. 20 and 21, in the gas cooler 26 for the carbon dioxide air conditioner of the present embodiment, the tank portion 13 and the plate portion 14 are compared with the fourth embodiment shown in FIGS. The difference is that the notch hole 18 and the slit 27 are provided in the joint portion 15, and other configurations are basically the same.

  The notch 18 is interposed between the adjacent first flat tubes 2a and the second flat tube 2b, and the slit 27 is provided between the adjacent first flat tubes 2a and 2b. Is interposed.

  Even in the fifth embodiment configured as described above, the same effects as those of the fourth embodiment shown in FIGS. 15 to 19 can be obtained. Further, in the fifth embodiment, the area of the joint portion 15 is reduced by the notch hole 18 and the slit 27, so that the flow of the outlet header tank 5 from the circulation portion 11 of the inlet header tank 4 via the joint portion 15 is reduced. When heat conduction is performed to the circulation part 12, heat is hardly transmitted and the cooling performance of carbon dioxide gas can be further improved.

Since the present invention has an effect that a gas cooler for a carbon dioxide air conditioner can be made thin, it can be applied to a carbon dioxide air conditioner using carbon dioxide (CO ₂ ) as a refrigerant.

1 is a perspective view showing a gas cooler for a carbon dioxide air conditioner according to a first embodiment of the present invention. It is sectional drawing of the gas cooler of FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing of the flat tube provided in the gas cooler of FIG. It is explanatory drawing which shows the flow of the cooling air in the core provided in the gas cooler of FIG. It is a disassembled perspective view of the flat tube and fin provided in the gas cooler of FIG. It is sectional drawing which shows the gas cooler for carbon dioxide gas air-conditioners which concerns on the 2nd Embodiment of this invention. It is sectional drawing which follows the BB line of FIG. It is a perspective view which shows the gas cooler for carbon dioxide gas air-conditioners which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the gas cooler of FIG. It is sectional drawing which follows the CC line of FIG. It is explanatory drawing of the intermediate part and fin of a flat tube provided in the gas cooler of FIG. It is explanatory drawing of the edge part and fin of a flat tube provided in the gas cooler of FIG. It is a disassembled perspective view of the flat tube and fin provided in the gas cooler of FIG. It is a perspective view which shows the gas cooler for carbon dioxide gas air-conditioners which concerns on the 4th Embodiment of this invention. It is sectional drawing of the gas cooler of FIG. It is sectional drawing which follows the DD line | wire of FIG. It is explanatory drawing of the intermediate part and fin of a flat tube provided in the gas cooler of FIG. It is a disassembled perspective view of the flat tube and fin provided in the gas cooler of FIG. It is sectional drawing which shows the gas cooler for carbon dioxide gas air conditioners which concerns on the 5th Embodiment of this invention. It is sectional drawing which follows the EE line | wire of FIG. It is a perspective view which shows the conventional heat exchanger. It is a top view of the heat exchanger of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b, 1c Fin 2a 1st flat tube 2b 2nd flat tube 3a, 3b Core 4 Inlet header tank 5 Outlet header tank 6 Turn side header tank 10 Gas cooler for carbon dioxide air conditioners 11, 12 Distribution part 13 Tank part 14 Plate part 15 Joint part 16 Communication path 17 Gas cooler for carbon dioxide air conditioner 18 Notch hole 20 Gas cooler for carbon dioxide gas air conditioner 21 Folded part 22 Gas cooler for carbon dioxide air conditioner 23, 24 Folded part,
26 Gas cooler for carbon dioxide air conditioner 27 Slit

Claims (4)

Fins (1a, 1b) and flat tubes (2a, 2b) forming a refrigerant passage are alternately stacked, and the cores (3a, 3b) arranged in two rows and the stacking direction of the flat tubes (2a, 2b) The inlet header tank (4) and the outlet header tank (5) connected to the end side of the core (3a, 3b), respectively, and the flat tube (2a, 2b) are stacked in the stacking direction. A gas cooler (10) for a carbon dioxide air conditioner having a turn side header tank (6) connected to the turn side of (3a, 3b),
The flat tubes (2a, 2b) are a first flat tube (2a) located on the downstream side of the cooling air and a second flat tube (2b) located on the upstream side of the cooling air. A gas cooler (10) for a carbon dioxide air conditioner, wherein the flat tube (2a) and the second flat tube (2b) are offset. The fins (1a, 1b, 1c) and the flat tubes (2a, 2b) forming the refrigerant passage are alternately stacked, and the cores (3a, 3b) arranged in two rows and the flat tubes (2a, 2b) Extending in the laminating direction, extending in the laminating direction of the flat tubes (2a, 2b), and the inlet header tank (4) and outlet header tank (5) connected to the end side of the core (3a, 3b), respectively. A gas cooler (20) for a carbon dioxide air conditioner having a turn side header tank (6) connected to a turn side of the core (3a, 3b),
The flat tubes (2a, 2b) are a first flat tube (2a) located on the downstream side of the cooling air and a second flat tube (2b) located on the upstream side of the cooling air. One of the flat tube (2a) and the second flat tube (2b) is bent at half the tube pitch in the axial direction of the header tank at both ends of the tube connected to the header tank. A gas cooler for carbon dioxide air conditioner (20). The fins (1c) and the flat tubes (2a, 2b) forming the refrigerant passage are alternately stacked, and extend in the stacking direction of the cores (3a, 3b) arranged in two rows and the flat tubes (2a, 2b). The inlet header tank (4) and the outlet header tank (5) respectively connected to the end side of the core (3a, 3b) and the flat tube (2a, 2b) are extended in the stacking direction, and the core (3a A gas cooler (22) for a carbon dioxide air conditioner having a turn side header tank (6) connected to the turn side of 3b),
The flat tubes (2a, 2b) are a first flat tube (2a) located on the downstream side of the cooling air and a second flat tube (2b) located on the upstream side of the cooling air. The flat tube (2a) and the second flat tube (2b) are bent at every two pitches at both ends of the tube connected to the header tank, and the first flat tube (2a) and the second flat tube adjacent to each other are bent. A gas cooler for a carbon dioxide air conditioner, wherein the ends of the first flat tube (2a) and the second flat tube (2b) are offset by being brought close to the end of the flat tube (2b) ( 22). A gas cooler (17, 26) for a carbon dioxide air conditioner according to any one of claims 1 to 3,
A tank part (13) in which a circulation part (11, 12) through which a refrigerant circulates is formed in the inlet header tank (4) and the outlet header tank (5), and both ends of the flat tube are inserted. And a plate portion (14) integrally formed, and a notch hole (18) is provided in a joint portion (15) between the tank portion (13) and the plate portion (14). Gas cooler for gas air conditioners (17, 26).

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