JP2005147488A - Heat exchanging device and air conditioner provided with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanging device and an air conditioner provided with the same, of which wiring connection operation of a heat exchanger is easily conducted. <P>SOLUTION: When a first heat exchanger 12 and a second heat exchanger 13 arranged proximately by facing with each other are connected by a connection pipe 28 laterally, the second heat exchanger 13 is stepped back from a side part of the first heat exchanger 12 and is unevenly arranged. A pipe end of the connection pipe 12 is welded and fixed on a refrigerant inlet and outlet parts 17, 25, 26 of side surfaces of the respective heat exchangers 12, 13. Thereby, mounting operation can be easily conducted without being interfered by other connection part of the connection pipe 28 or a side surface U-shaped pipe 16 of the heat exchanger. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchange device and an air conditioner in which the heat exchange device is built in an indoor unit or the like.

  In recent years, in air conditioners, there is a desire to improve the heat exchange efficiency while downsizing the casing of the indoor unit. If a plurality of heat exchangers are provided in order to improve the heat exchange efficiency and the casing is made compact, the piping space for the refrigerant piping is inevitably reduced and the shape becomes complicated. For this reason, the workability of assembling such as brazing work of the connecting pipe connecting the heat exchangers is deteriorated. In particular, as the number of rows of refrigerant tubes in the heat exchanger increases, the U-tubes protruding from the side and the other pipe ends of the connection pipes become obstructive, and the brazing workability of the connection parts is further deteriorated. Become.

  In FIG. 7, the auxiliary heat exchanger 104 is disposed close to the back side of the back side heat exchanger 103 having the same effective length among the three divided heat exchange units 101, 102, and 103, and both the heat exchangers 103, 104 are arranged. The operation | work process which brazes and connects the connecting piping 105 between is shown. FIG. 4A is a side view of the heat exchanging portion, and FIG. 4B is a front view of the heat exchanging portion with a part omitted.

  In this assembly work process, first, the auxiliary heat exchanger 104 is attached to the back side of the back side heat exchanger 103, and then the pipe ends 105a and 105b of the connecting pipe 105 are connected to the inlets and outlets 103a of the respective heat exchangers 103 and 104. , 104a, and braze the plug.

  However, when the back side heat exchanger 103 and the auxiliary heat exchanger 104 have the same effective length, when the pipe end of the connection pipe 105 is brazed to the inlet / outlet portion, it protrudes from the other connection part 105b or the side surface of the heat exchanger. The U-shaped tube 106 that gets in the way makes it difficult to braze.

  The brazed portion of the back side heat exchanger 103 shown in FIG. 7 is approximately in the facing direction A between the brazed portion 104a of the auxiliary heat exchanger 104, the U-shaped tube 106 of the auxiliary heat exchanger, and both the heat exchangers 103 and 104. This is because they are arranged in a straight line, that is, overlapped. In such a case, the assembling work becomes difficult.

  By the way, in Patent Document 1, in order to secure the space of the pipe rising part and the pipe distribution processing part for connecting the refrigerant communication pipe to the front heat exchanging part and the rear heat exchanging part in the side part of the casing, An indoor unit of an air conditioner is disclosed in which the effective length of the section is shortened to form a piping processing space on the side of the rear heat exchange section.

  Patent Document 2 discloses a hairpin that optimizes the wind speed distribution by placing a sub heat exchanger with a shorter longitudinal dimension inside the main heat exchanger and communicates with the refrigerant pipe of the heat exchanger. An air conditioner has been disclosed in which the heat exchange capability by heat dissipation and heat absorption from the U vent is improved, the heat exchanger layout is facilitated, and the size is further reduced.

In Patent Document 3, of the first heat exchanger to the third heat exchanger, the lateral width of the third heat exchanger on the back side is formed shorter than that of the other heat exchangers, and the dehumidification decompression is formed in a space formed there. The technique which compensates for the capability fall by arrange | positioning an apparatus and shortening a 3rd heat exchanger with the 2nd heat exchanger arrange | positioned inside the 1st heat exchanger is disclosed.
Japanese Patent Laid-Open No. 2001-82795 (see paragraph 0005 of the specification) JP 2000-337652 A (see paragraphs 0031 to 0035 of the specification) Japanese Patent No. 3276918 (see paragraph 0023 of the specification)

  However, in any of the above-described Patent Documents 1 to 3, in the piping structure in which the back side heat exchanger and the auxiliary heat exchanger as shown in FIG. Therefore, it cannot be said that the technique which eliminates the difficulty of the brazing operation | work of the connection piping of both heat exchangers as shown in FIG. 7 is disclosed.

  In view of the above problems, an object of the present invention is to provide an air conditioner that can easily perform a connecting and assembling operation such as brazing in a heat exchange apparatus that pipe-connects both heat exchangers that face each other and are arranged close to each other. .

  In order to achieve the above object, in the present invention, in the heat exchange apparatus in which the first heat exchanger and the second heat exchanger, which are arranged close to each other so as to face each other, are connected to each other by a connecting pipe, The heat exchangers of 2 are arranged in a step backward from the side of the first heat exchanger, and the pipe ends of the connecting pipes are fixed by welding to the refrigerant inlet / outlet on the side of each heat exchanger. It is said.

  In the above configuration, since the second heat exchanger is arranged in a different level from the first heat exchanger, when connecting the pipe end of the connection pipe to the refrigerant inlet / outlet portion of each heat exchanger, Alternatively, the side U-shaped tube of the heat exchanger does not get in the way, and the assembly work can be easily performed.

  In particular, the inlet / outlet portion formed in both heat exchangers and the pipe end connecting part of the connecting pipe are arranged in a substantially straight line in the facing direction of the other connecting parts or the side U-tubes of the heat exchanger and the two heat exchangers. This is effective for assembly work.

  Here, as an example of a configuration in which the second heat exchanger moves backward from the first heat exchanger and is arranged in a different stage, the effective length of the second heat exchanger is shorter than that of the first heat exchanger. The case where it forms is mentioned.

  Further, as an example of welding of the connecting pipe, brazing that is optimal for connecting the refrigerant pipe using a copper pipe or the like can be mentioned.

  Further, the connecting pipe is not limited to a single pipe configuration that connects one inlet / outlet of both heat exchangers, but branches from the inlet / outlet of the second heat exchanger to two or more locations of the first heat exchanger. A branch pipe portion that is branched and connected is included. In the case of a connecting pipe having such a branch pipe portion, the number of refrigerant inlets and outlets of each heat exchanger is increased, and the connecting portion is easily hidden by a U-shaped pipe or the like. The arrangement is particularly effective.

  In the heat exchanger, the refrigerant tubes are usually arranged in a plurality of stages, and in particular, the first heat exchanger is composed of a large number of radiating fins and a refrigerant tube penetrating the fins. When the tubes are arranged in a plurality of rows and in a plurality of rows with respect to the radiating fins and there are a plurality of refrigerant inlets / outlets, the inlet / outlet portion easily overlaps with the other pipe ends of the U-shaped pipe and the connecting pipe. A configuration in which the heat exchangers are arranged in a different manner with respect to the first heat exchanger and the connection pipe is fixed by welding is effective. In particular, when the refrigerant tubes are arranged in three rows, if the first heat exchanger is made compact, the row pitch becomes smaller and the brazing operation becomes more difficult, which is particularly effective.

  In addition, the structure provided with another heat exchanger other than the 1st heat exchanger and the 2nd heat exchanger may be sufficient as the heat exchange apparatus. In addition, when a heat exchange device is incorporated in an air conditioner, there is a possibility that the connection piping becomes complicated due to the compactness of the casing of the indoor unit. In such a case, the first heat exchanger and the second heat exchange The structure which arrange | positions a container in a step and forms the welding fixing | fixed part of connection piping in a step becomes effective.

  In this case, if the second heat exchanger is arranged on the back side of the first heat exchanger, the second heat exchanger is arranged using the space between the first heat exchanger and the casing effectively. Therefore, the indoor unit can be made compact.

  As described above, according to the present invention, since the second heat exchangers are arranged in stages with respect to the first heat exchanger, it is possible to easily perform a connecting and assembling operation such as brazing.

  Hereinafter, an embodiment of an air conditioner according to the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of an indoor unit of an air conditioner, FIG. 2 is a perspective view showing an assembled state of a heat exchanger built in the indoor unit, FIG. 3 is an enlarged perspective view of a connecting pipe assembly portion, and FIG. FIG. 5 is a refrigerant flow diagram of a plurality of heat exchangers.

  The air conditioner of this embodiment illustrates a separate type separated into an indoor unit 1 and an outdoor unit (not shown). As shown in FIG. 1, the indoor unit 1 has a suction port 3 formed in the front and upper surfaces of the casing 2, and a blowout port 5 provided with a louver unit 4 in the lower front surface. A heat exchange unit 6 and an indoor fan 7 are built in the casing 2 from the inlet 3 to the outlet 5.

  The heat exchange unit 6 includes a front side heat exchanger 10, a top side heat exchanger 11, a back side heat exchanger 12, and a back side heat exchanger that are divided into three along the inside of the suction port 3 in order to reduce the size. 12 and an auxiliary heat exchanger 13 disposed in a space between the rear surface side of the casing 12 and the rear surface portion of the casing 2. The back side heat exchanger constitutes the first heat exchanger 12 and the auxiliary heat exchanger constitutes the second heat exchanger 13.

  The indoor fan 7 is a cross-flow fan, and is disposed closer to the outlet 5 than the heat exchange unit 6. The indoor fan 7 sucks room air from the inlet 3 and exchanges heat with the heat exchanger 6. Hot air or cold air is blown out from.

  The heat exchangers 10 to 12 divided into three are provided with multistage plural rows of refrigerant tubes 15 provided so as to penetrate a large number of heat radiation fins 14, and the ends of the refrigerant tubes are connected by U-shaped tubes 16. Thus, a meandering refrigerant flow path is formed.

  As shown in FIG. 1, the refrigerant tubes 15 in the present embodiment are formed in three rows (for example, 6 to 8 steps) in three rows in each of the heat exchangers 10 to 12, and as shown in FIG. In the heat exchangers 10 and 11 on the upper surface side, two rows of refrigerant flow paths are formed.

  In addition, in the first heat exchanger 12 on the back side, four rows of refrigerant flow paths are formed. Therefore, the side refrigerant of the first heat exchanger 12 on the back side has a refrigerant on the back side. Four inlets / outlets 17 are provided in the tube row, and four inlets / outlets 18 are provided in the refrigerant tube row on the front surface side (indoor fan side).

  The second heat exchanger 13 is disposed facing the back surface of the first heat exchanger 12 on the back surface side, and the effective length thereof is the other heat exchangers 10 to 10 as shown in FIGS. 2 and 3. Compared to 12, it is formed shorter. Then, the second heat exchanger 13 is stepped back to a position retracted by one step from the side surface of the first heat exchanger 12 via the mounting plate 20 fixed to the side surface of the first heat exchanger 12 on the back side. Is attached.

  In this case, the stepped dimensions of the heat exchangers 12 and 13 are not particularly limited, and are appropriately selected according to the protruding height of the U-tube 16 of the connecting pipe 28 and the heat exchangers 12 and 13. It is sufficient to set the dimensions so that the brazing operation is not disturbed by the members.

  As shown in FIG. 6, the mounting plate 20 is an L-shaped plate material that bends from the side surface of the first heat exchanger 12 to the back surface side, and a pair of engagement holes 21 are formed in the back surface portion. . By engaging the engaging claw 24 of the L-shaped mounting plate 23 on the side surface of the second heat exchanger 13 in the engaging hole 21 of the mounting plate 20, the first heat exchanger 12 is fixed. The second heat exchanger 13 is positioned. As a result, the second heat exchanger 13 is disposed in close proximity to the back side of the first heat exchanger 12.

  The second heat exchanger 13 includes a multi-stage (for example, four-stage) refrigerant tube 15 provided so as to penetrate a large number of heat radiation fins 14, and the end of the refrigerant pipe is formed by a U-shaped tube 16. By being connected, a meandering refrigerant flow path is formed. Then, one of the refrigerant pipe inlets 25 and 26 on the side surface of the second heat exchanger 13 is connected to four inlets 17 on the back side of the first heat exchanger 12 by connecting pipes 28. The other inlet / outlet 26 is connected by piping to a compressor or heat exchanger (both not shown) on the outdoor unit side.

  With such a pipe connection structure, as shown in FIG. 5, the second heat exchanger 13 passes through the first heat exchanger 13 and branches to the upper surface side and front surface side heat exchangers 10 and 11, and both heats are generated. A refrigerant flow path is formed from the inlet / outlet of the exchanger to the compressor or heat exchanger (both not shown) on the outdoor unit side. 2 and 3 show the pipes 29 and 30 connected to the outdoor unit side.

  As shown in FIG. 4, the connecting pipe 28 includes a meandering main pipe portion 28 a connected to the inlet / outlet of the second heat exchanger 13, a T-shaped pipe portion 28 b joined to the other end, and a T-shaped pipe portion. 28b, and U-shaped branch pipe portions 28c and 28d that are joined to both ends of 28b and brazed to the inlet / outlet port 17 of the first heat exchanger 12, respectively, and these pipe portions are integrally formed by welding such as brazing. It is formed. The total four pipe ends of one pipe end of the main pipe portion 28a and the branch pipe portions 28b and 28c have the same pipe direction, and each of the four inlet / outlet ports 17 of the first heat exchanger 12 has the same direction. And it inserts in the one entrance 25 of the 2nd heat exchanger 13, and the perimeter of the insertion part is welded by brazing.

  A pipe processing unit 32 including a throttle mechanism 31 is provided between the pipe 2 and the casing 2 on the side of the first heat exchanger 12 and further to the side of the first heat exchanger 12. The pipes 29 and 30 are extended to the outdoor unit side. The throttling mechanism 31 is not particularly limited as long as it has the same function such as a capillary tube, an expansion valve, and an electromagnetic valve having a throttling function for the entire valve.

  6A and 6B show the brazing and assembling work process of the connecting pipe in this embodiment. FIG. 6A is a side view of the heat exchanging portion, and FIG. 6B is a front view of the heat exchanging portion with a part omitted. is there. The assembly work of the connecting pipe 28 in the heat exchanging unit 6 will be described based on this figure. First, the front side heat exchanger 10, the top side heat exchanger 11 and the flat side formed from the heat exchanger in three parts are described. The first heat exchanger 12 on the back side is connected to each other by a mounting plate 20 attached to the side surface thereof, and is fixed in an inverted U shape in side view surrounding the indoor fan 7.

  In addition, before each heat exchanger 10-12 connects and attaches attachment plates 20 mutually, the brazing operation | work of the refrigerant | coolant pipe | tube and U-shaped pipe which is not directly related to an assembly | attachment operation | work is performed beforehand.

  The second heat exchanger 13 prepared separately from this state faces the back side of the first heat exchanger 12, and the second heat exchanger 13 is attached to the engagement hole 21 of the mounting plate 20 on the first heat exchanger 12 side. The locking claw 24 of the exchanger 13 is locked, and the second heat exchanger 13 is positioned. In this state, the second heat exchanger 13 is positioned in a stepped state retracted from the side with respect to the first heat exchanger 12.

  Next, the connecting pipe 28 is inserted into the respective inlets 17 and 25 of the first heat exchanger 12 and the second heat exchanger 13, and the plugs are brazed. At this time, the entrances 17 and 25 formed in both the heat exchangers 12 and 13 are arranged substantially linearly in the facing direction of the other pipe end 28a or the U-shaped pipe 16 and both the heat exchangers 12 and 13. However, since the second heat exchanger 13 is installed in a step with respect to the first heat exchanger 12, the other pipe end 28a or the U-shaped pipe 16 is not disturbed when brazing. Attaching work can be easily performed. In particular, the first heat exchanger 12 has a pipe structure with eight stages and three rows of refrigerant pipes, and both the stage pitch and the row pitch are small, so that the second heat exchanger 13 is installed in a different stage. This is particularly effective in eliminating the difficulty of brazing work.

It is to be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that modifications and changes can be made within the scope of the present invention. For example, in the above embodiment, the first heat exchanger is shown in which three rows of refrigerant tubes are arranged. However, the first heat exchanger is not limited to this, and may be two rows or four rows or more. The number of heat exchangers is not limited to the above-described embodiment, and any structure that includes at least a first heat exchanger and a second heat exchanger may be used. Further, the second heat exchanger is not limited to being disposed on the back side of the first heat exchanger as in the above embodiment, but may be disposed on the front side.

Side surface sectional drawing of the indoor unit which shows embodiment of the air conditioner which concerns on this invention The perspective view which shows the assembly | attachment state of the heat exchanger of FIG. FIG. 2 is an enlarged perspective view of the connecting pipe assembly portion of FIG. 3 is a perspective view of the connecting pipe in FIG. The figure which shows the flow of the refrigerant | coolant of the heat exchanger group of FIG. The connection piping brazing assembly work process in this embodiment is shown, The figure (a) is a side view of a heat exchange part, (b) is the front view of the heat exchange part which abbreviate | omitted one part The work process which brazes and attaches connection piping between heat exchangers with the same effective length is shown, The figure (a) is a side view of a heat exchange part, (b) is a heat exchange part which omitted a part. Front view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Casing 3 Intake port 4 Louver unit 5 Outlet 6 Heat exchange part 7 Indoor fan 10 Front surface side heat exchanger 11 Upper surface side heat exchanger 12 Rear surface side heat exchanger (1st heat exchanger)
13 Second heat exchanger 14 Radiation fin 15 Refrigerant pipe 16 U-shaped pipes 17, 18 Entrance / exit 20 Mounting plate 21 Engaging hole 23 Mounting plate 24 Locking claws 25, 26 Refrigerating pipe entrance / exit 28 Connection piping 29, 30 Piping 31 Restriction Mechanism 32 Piping processing section

Claims (9)

In a heat exchange apparatus in which a first heat exchanger and a second heat exchanger, which are arranged close to each other so as to face each other, are connected to each other by a connecting pipe, the second heat exchanger is a first heat exchanger. A heat exchange apparatus, wherein the pipe ends of the connecting pipes are arranged in a stepped manner with respect to the side portions of the heat exchangers, and the pipe ends of the connection pipes are welded and fixed to the refrigerant inlet / outlet portions on the side surfaces of the heat exchangers. Refrigerant inlet / outlet portions that are formed in the first heat exchanger and the second heat exchanger, respectively, and are welded and fixed to the pipe ends of the connection pipes are connected to other pipe end connection parts of the connection pipes or the side surfaces U of the heat exchangers. The heat exchanger according to claim 1, wherein the heat exchanger is arranged substantially linearly in a facing direction between the character tube and the heat exchangers. The effective length of the second heat exchanger is formed shorter than that of the first heat exchanger, and the second heat exchanger is disposed in a step backward from the side portion of the first heat exchanger. The heat exchange device according to claim 1, wherein: The heat exchange device according to claim 1, wherein a pipe end of the connection pipe is brazed to a refrigerant inlet / outlet portion of each heat exchanger. The said connection piping contains the branch pipe part branched from the entrance-and-exit part of a 2nd heat exchanger, and being branched and connected to two or more places of a 1st heat exchanger. The heat exchange apparatus as described. The first heat exchanger includes a plurality of radiating fins and a refrigerant pipe penetrating the fins, the refrigerant pipes are arranged in a plurality of rows and in a plurality of rows with respect to the radiating fins, and refrigerant inlet / outlet portions are provided. The heat exchange device according to claim 1, wherein a plurality of heat exchange devices are formed. The heat exchange device according to claim 6, wherein the refrigerant tubes are arranged in multiple rows and three rows with respect to the radiation fins. An air conditioner in which the heat exchange device according to claim 1 is incorporated. Three heat exchangers are arranged along the inside of the air inlet of the indoor unit, and the back side heat exchanger of these is the first heat exchanger, and the second heat exchanger is connected to the back side of the first heat exchanger. The air conditioner according to claim 8, wherein the heat exchangers are arranged in close proximity to each other, and the first heat exchanger and the second heat exchanger are connected to each other by a connecting pipe. Machine.

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