JP2024031697A - Indoor unit and air conditioner - Google Patents

Abstract

The present invention proposes an indoor unit that can suppress the occurrence of electrolytic corrosion in refrigerant piping, and an air conditioner equipped with the indoor unit. [Solution] The indoor unit (1) is connected to a casing (21), a heat exchanger (15) housed in a space (21a) in the casing (21), and a refrigerant. and a connecting pipe (31) through which the water flows. The connecting pipe (31) has one end connected to the heat exchanger (15), and a first refrigerant pipe (311) formed of a first metal, and the first refrigerant pipe (311) of the first refrigerant pipe (311). and a second refrigerant pipe (312) formed of a second metal that is potentially more noble than metals. One end of the second refrigerant pipe (312) is connected to the other end of the first refrigerant pipe (311) within the casing (21). In the space (21a) in the casing (21), the second refrigerant pipe (312) is arranged within the cylindrical member (61) so that the outer peripheral surface of the second refrigerant pipe (312) is covered with the cylindrical member (61). be done. [Selection diagram] Figure 7

Description

The present disclosure relates to an indoor unit and an air conditioner.

Conventionally, in an indoor unit, a connection part between a first refrigerant pipe made of aluminum or an aluminum alloy and a second refrigerant pipe made of copper or a copper alloy is connected to a falling part of the first refrigerant pipe. There is one in which the first refrigerant pipe is arranged and anti-corrosion treatment is applied to the first refrigerant pipe (see, for example, Japanese Patent Laid-Open No. 2013-155892 (Patent Document 1)).

Japanese Patent Application Publication No. 2013-155892

In the above indoor unit, since the dissimilar metals of the first and second refrigerant pipes are connected outside the casing, condensation is likely to occur in the first and second refrigerant pipes when exposed to indoor air. , a dew proof cylinder is provided to cover the second refrigerant pipe. Since the inside of this dew protection cylinder is difficult to dry, there is a problem in that the connecting portion of the first and second refrigerant pipes remains wet for a long time, resulting in electrolytic corrosion.

The present disclosure proposes an indoor unit that can suppress the occurrence of electrolytic corrosion in refrigerant piping, and an air conditioner equipped with the indoor unit.

The indoor unit according to the first aspect of the present disclosure includes a casing;
a heat exchanger housed in the space within the casing;
comprising a connecting pipe connected to the heat exchanger and through which a refrigerant flows, and a cylindrical member,
The above connection piping is
a first refrigerant pipe formed of metal and having one end connected to the heat exchanger;
and a second refrigerant pipe formed of a metal that is potentially nobler than the metal of the first refrigerant pipe,
One end of the second refrigerant pipe is connected to the other end of the first refrigerant pipe in the space within the casing,
In the space within the casing, the second refrigerant pipe is arranged within the cylindrical member such that the outer peripheral surface of the second refrigerant pipe is covered with the cylindrical member.

According to the above configuration, by arranging the connection point between the first refrigerant pipe and the second refrigerant pipe in the space accommodating the heat exchanger in the casing, and covering the outer peripheral surface of the second refrigerant pipe with the cylindrical member, It is possible to suppress the occurrence of electrolytic corrosion in the refrigerant piping.

The indoor unit according to the second aspect of the present disclosure includes:
In the indoor unit of the first aspect,
The first refrigerant pipe is arranged outside the cylindrical member so that the outer peripheral surface of the first refrigerant pipe is not covered with the cylindrical member.

According to the above configuration, by preventing the outer circumferential surface of the first refrigerant pipe from being covered with the cylindrical member, the first refrigerant pipe can easily dry. Therefore, the possibility of electrolytic corrosion occurring in the first refrigerant pipe can be reduced.

The indoor unit according to the third aspect of the present disclosure includes:
In the indoor unit of the first aspect or the second aspect,
The connection pipe includes a third refrigerant pipe that connects the other end of the first refrigerant pipe and one end of the second refrigerant pipe,
The third refrigerant pipe is arranged within the cylindrical member so that the outer peripheral surface of the third refrigerant pipe is covered with the cylindrical member.

According to the above configuration, by connecting the second refrigerant pipe to the first refrigerant pipe via the third refrigerant pipe and covering the outer circumferential surface of the third refrigerant pipe with the cylindrical member, the outer circumferential surface of the first refrigerant pipe is Continuation of condensed water from the first refrigerant pipe to the outer circumferential surface of the second refrigerant pipe can be suppressed.

The indoor unit according to the fourth aspect of the present disclosure includes:
In the indoor unit of the third aspect,
The third refrigerant pipe is made of stainless steel.

According to the above configuration, since the third refrigerant pipe is made of stainless steel, it is possible to reduce the possibility that electrolytic corrosion will occur in the first liquid refrigerant pipe.

The indoor unit according to the fifth aspect of the present disclosure includes:
In any one of the indoor units from the first aspect to the fourth aspect,
The second refrigerant pipe is arranged in the space within the casing and includes a bent portion that is bent so as to protrude downward.

According to the above configuration, by arranging the bent portion of the second refrigerant pipe that is bent so as to protrude downward in the space inside the casing, the condensed water generated at the bent portion and its surrounding area is transferred to the bent portion by gravity. It collects at the lower end of the bottle and drips. As a result, in the space within the casing, it is possible to suppress condensed water from flowing through the second refrigerant pipe and into the first refrigerant pipe.

The indoor unit according to the sixth aspect of the present disclosure includes:
In the indoor unit of the fifth aspect,
The above bent part is
a first slope portion extending obliquely upward toward the heat exchanger side;
a second slope portion extending diagonally upward toward the opposite side of the heat exchanger;
The cylindrical member covers from the outer circumferential surface of the first slope section to the outer circumferential surface of the second slope section.

According to the above configuration, by covering the outer peripheral surface of the first slope part to the outer peripheral surface of the second slope part with the cylindrical member, the condensed water on the outer peripheral surfaces of the first slope part and the second slope part is removed from the first slope part. Even if the refrigerant is separated from the slope portion and the second slope portion, it is possible to prevent the refrigerant from adhering to the first refrigerant pipe.

The indoor unit according to the seventh aspect of the present disclosure includes:
In any one of the indoor units from the first aspect to the sixth aspect,
a fixing member for fixing the cylindrical member to the connecting pipe;
The fixing member is wound around the outer peripheral surface of the cylindrical member so that the cylindrical member is pressed against the outer peripheral surface of the connecting pipe.

According to the above configuration, since the fixing member fixes the cylindrical member to the connecting pipe, it is possible to suppress the displacement of the cylindrical member with respect to the connecting pipe.

The indoor unit according to the eighth aspect of the present disclosure includes:
In the indoor unit of the seventh aspect,
The fixing member is wound around the outer circumferential surface of the cylindrical member so that the cylindrical member is pressed against the outer circumferential surface of the second refrigerant pipe.

According to the above configuration, by wrapping the fixing member around the outer circumferential surface of the cylindrical member, the cylindrical member is pressed against the outer circumferential surface of the second refrigerant pipe, so that the movement of condensed water along the second refrigerant pipe is suppressed by the cylindrical member. can do.

The indoor unit according to the ninth aspect of the present disclosure includes:
In the indoor unit of the third aspect,
a fixing member for fixing the cylindrical member to the connecting pipe;
The fixing member is wound around the outer peripheral surface of the cylindrical member so that the cylindrical member is pressed against the outer peripheral surface of the third refrigerant pipe.

According to the above configuration, since the fixing member fixes the cylindrical member to the connecting pipe, it is possible to suppress the displacement of the cylindrical member with respect to the connecting pipe.

The indoor unit according to the tenth aspect of the present disclosure is
In any one of the indoor units from the first aspect to the ninth aspect,
The connection pipe includes a first connection pipe and a second connection pipe,
The first connection pipe and the second connection pipe each include the first refrigerant pipe and the second refrigerant pipe,
The first connecting pipe is a liquid pipe, while the second connecting pipe is a gas pipe,
The first refrigerant pipe of the first connection pipe and the first refrigerant pipe of the second connection pipe are adjacent to each other in the horizontal direction, or the first refrigerant pipe of the first connection pipe is adjacent to the first refrigerant pipe of the second connection pipe. The connecting pipe is located above the first refrigerant pipe.

Here, the liquid pipe is a refrigerant pipe connected to the inlet of the evaporator (heat exchanger during cooling operation or dehumidification operation). Further, the gas pipe is a refrigerant pipe connected to the outlet of the evaporator (heat exchanger during cooling operation or dehumidification operation).

According to the above configuration, since the first connection pipe is a liquid pipe and the second connection pipe is a gas pipe, the amount of condensed water generated in the second connection pipe is greater than that generated in the first connection pipe. In this case, when the first refrigerant pipe of the first connection pipe and the first refrigerant pipe of the second connection pipe are adjacent to each other in the horizontal direction, the condensed water dripping from the first refrigerant pipe of the second connection pipe is The possibility of the refrigerant adhering to the first refrigerant pipe of the connection pipe can be reduced.

Furthermore, even when the first refrigerant pipe of the first connection pipe is located above the first refrigerant pipe of the second connection pipe, the condensed water dripping from the first refrigerant pipe of the second connection pipe is transferred to the first connection pipe. The possibility of the refrigerant adhering to the first refrigerant pipe can be reduced.

The indoor unit according to the eleventh aspect of the present disclosure is
In any one of the indoor units from the first aspect to the ninth aspect,
The connection pipe includes a first connection pipe and a second connection pipe,
The first connection pipe and the second connection pipe each include the first refrigerant pipe and the second refrigerant pipe,
The first refrigerant pipe of the first connection pipe is a liquid pipe that is inclined at a first angle with respect to the horizontal direction, while the first refrigerant pipe of the second connection pipe is a liquid pipe that is inclined at a first angle with respect to the horizontal direction. The gas pipe is inclined at a second angle different from the above angle.

Here, the liquid pipe is a refrigerant pipe connected to the inlet of the evaporator (heat exchanger during cooling operation or dehumidification operation). Further, the gas pipe is a refrigerant pipe connected to the outlet of the evaporator (heat exchanger during cooling operation or dehumidification operation).

According to the above configuration, the inclination angle (first angle) of the first refrigerant pipe of the first connection pipe with respect to the horizontal direction is the same as the inclination angle (second angle) of the second connection pipe with respect to the horizontal direction of the first refrigerant pipe. Since they are different, it is possible to reduce the possibility that condensed water will be retained between the first refrigerant pipe of the first connection pipe and the first refrigerant pipe of the second connection pipe.

The indoor unit according to the twelfth aspect of the present disclosure is
In any one of the indoor units from the first aspect to the sixth aspect,
a fixing member for fixing the cylindrical member to the connecting pipe;
The connection pipe includes a first connection pipe and a second connection pipe,
The fixing member is wound around the outer circumferential surface of the cylindrical member such that the cylindrical member is pressed against the outer circumferential surface of the first connecting pipe and the outer circumferential surface of the second connecting pipe,
The fixing member is arranged around a location where the first connection pipe and the second connection pipe intersect.

According to the above configuration, since the fixing member fixes the cylindrical member to the connecting pipe, it is possible to suppress the displacement of the cylindrical member with respect to the connecting pipe.

The indoor unit according to the thirteenth aspect of the present disclosure is
In any one of the indoor units from the first aspect to the fifth aspect,
a coating member or a coating film that closely contacts the outer peripheral surface of the connecting portion between the first refrigerant pipe and the second refrigerant pipe and covers the outer peripheral surface of the connecting portion;
The covering member or coating film is arranged within the cylindrical member so that the covering member or coating film is covered with the cylindrical member.

According to the above configuration, the coating member or the coating film covers the outer circumferential surface of the connecting portion between the first refrigerant pipe and the second refrigerant pipe, so it is possible to reduce the possibility that electrolytic corrosion will occur in the first liquid refrigerant pipe. .

The indoor unit according to the fourteenth aspect of the present disclosure is
The indoor unit according to the thirteenth aspect further includes a fixing member for fixing the cylindrical member to the connecting pipe,
The fixing member is wound around the outer peripheral surface of the cylindrical member so that the cylindrical member is pressed against the outer peripheral surface of the covering member or coating film.

According to the above configuration, since the fixing member fixes the cylindrical member to the connecting pipe, it is possible to suppress the displacement of the cylindrical member with respect to the connecting pipe.

The air conditioner according to the fifteenth aspect of the present disclosure includes:
The indoor unit includes any one of the first aspect to the fourteenth aspect.

According to the above configuration, since the indoor unit is provided, it is possible to suppress the occurrence of electrolytic corrosion in the refrigerant piping.

FIG. 1 is a refrigerant circuit diagram of an air conditioner including an indoor unit according to a first embodiment of the present disclosure. It is a perspective view of the indoor unit of the air conditioner of the said 1st Embodiment. It is a front view of the indoor unit of the air conditioner of the said 1st Embodiment. It is a back perspective view of the indoor unit of the air conditioner of the said 1st Embodiment. 4 is a sectional view taken along the line VV in FIG. 3. FIG. It is a figure which looked at the indoor heat exchanger of the indoor unit of the said 1st Embodiment, the connection piping for liquid refrigerant, and the connection piping for gas refrigerant from the front side. FIG. 2 is a schematic diagram of the main parts of the indoor heat exchanger of the indoor unit of the first embodiment, viewed from the front side. FIG. 2 is a schematic diagram of the main parts of the indoor heat exchanger of the indoor unit of the first embodiment, viewed from the front side. FIG. 2 is a side view of the indoor heat exchanger, liquid refrigerant connection pipes, and gas refrigerant connection pipes of the indoor unit of the first embodiment, viewed from the right side. FIG. 2 is a schematic diagram of main parts of an indoor unit according to a second embodiment of the present disclosure, viewed from the front side. FIG. 7 is a schematic diagram of main parts of a modified example of the indoor unit according to the second embodiment of the present disclosure, viewed from the front side. FIG. 7 is a schematic diagram of main parts of an indoor unit according to a third embodiment of the present disclosure, viewed from the front side. FIG. 7 is a schematic diagram of main parts of an indoor unit according to a fourth embodiment of the present disclosure, viewed from the front side. FIG. 7 is a schematic diagram of main parts of an indoor unit according to a fifth embodiment of the present disclosure, viewed from the front side. FIG. 7 is a schematic diagram of a main part of a modified example of the indoor unit according to the fifth embodiment of the present disclosure, viewed from the front side.

Hereinafter, the indoor unit and air conditioner of the present disclosure will be described in detail with reference to illustrated embodiments. Note that common parts in each figure are given the same reference numerals, and redundant explanation will be omitted. In addition, the up, down, left, and right directions in the description correspond to the up, down, left, and right directions when the indoor unit is installed indoors.

[First embodiment]
FIG. 1 shows a refrigerant circuit RC included in an air conditioner including an indoor unit 1 according to a first embodiment of the present disclosure. The air conditioner of the first embodiment includes an indoor unit 1 and an outdoor unit 2 connected to the indoor unit 1 via a refrigerant circuit RC. The above-mentioned air conditioner is a pair-type air conditioner in which an indoor unit 1 and an outdoor unit 2 are one-to-one.

The refrigerant circuit RC includes a compressor 11 , a four-way switching valve 12 , an outdoor heat exchanger 13 , an electric expansion valve 14 , an indoor heat exchanger 15 , and an accumulator 16 . As the compressor 11 is driven, refrigerant (for example, HFC refrigerant such as R410A and R32) circulates through the refrigerant circuit RC. The indoor heat exchanger 15 is an example of a heat exchanger.

More specifically, one end of a four-way selector valve 12 is connected to the discharge side of the compressor 11. One end of an outdoor heat exchanger 13 is connected to the other end of the four-way switching valve 12 . One end of an electric expansion valve 14 is connected to the other end of the outdoor heat exchanger 13 . One end of an indoor heat exchanger 15 is connected to the other end of the electric expansion valve 14 via a closing valve V1 and a connecting pipe L1. One end of an accumulator 16 is connected to the other end of the indoor heat exchanger 15 via a connecting pipe L2, a closing valve V2, and a four-way switching valve 12. The other end of the accumulator 16 is connected to the suction side portion of the compressor 11.

Further, the indoor heat exchanger 15 and the indoor fan 18 are mounted on the indoor unit 1. This indoor fan 18 is, for example, a cross flow fan, and sucks indoor air through the indoor heat exchanger 15.

Further, the compressor 11 , the four-way switching valve 12 , the outdoor heat exchanger 13 , the electric expansion valve 14 , the accumulator 16 and the outdoor fan 17 are mounted on the outdoor unit 2 .

During cooling operation and dehumidification operation, the air conditioner switches the four-way switching valve 12 to the switching position indicated by the solid line to start the compressor 11, while during heating operation, the four-way switching valve 12 is switched to the switching position indicated by the dotted line. and starts the compressor 11. Note that the direction of the solid arrow in FIG. 1 indicates the direction in which the refrigerant flows during cooling operation and dehumidification operation. Further, the direction of the dotted arrow in FIG. 1 indicates the direction in which the refrigerant flows during heating operation.

FIG. 2 is a diagram of the indoor unit 1 viewed diagonally from above, and FIG. 3 is a diagram of the indoor unit 1 viewed from the front side.

As shown in FIGS. 2 and 3, the indoor unit 1 includes a casing 21, and an indoor heat exchanger 15 (shown in FIG. 1), an indoor fan 18 (shown in FIG. 1), etc. are housed in the casing 21. There is.

A suction port 22 for sucking indoor air is provided in the upper part of the casing 21. When the indoor fan 18 is driven, indoor air enters the casing 21 from the suction port 22 and heads toward the indoor fan 18 (cross flow fan). At this time, a filter (not shown) is attached to the suction port 22 to prevent dust and the like from entering the casing 21 together with the indoor air.

At the bottom of the casing 21, an air outlet 23 is provided that blows out air from the indoor fan 18 (indoor air that has exchanged heat with the indoor heat exchanger 15). A horizontal flap 24 is rotatably attached to the peripheral edge of the air outlet 23.

When a cooling operation or the like starts, the horizontal flap 24 shifts from a stopped position in which it closes the air outlet 23 to an operating position in which it opens the air outlet 23, and changes the vertical direction of the air blown out from the air outlet 23. Adjust.

4 is a rear perspective view of the indoor unit 1, and FIG. 5 is a sectional view taken along the line VV in FIG. 3. In FIG. 5, 28 is an electrical component section.

As shown in FIGS. 4 and 5, the casing 21 of the indoor unit 1 includes a bottom frame 25, a front grill 26 attached to the bottom frame 25, and having a substantially rectangular opening (not shown) on the front surface. The front panel 27 is attached to cover the opening of the front grill 26. The front grill 26 surrounds the front, top, bottom, and both sides of the bottom frame 25. The rear side of the bottom frame 25 is attached to an indoor wall via a mounting plate (not shown).

The inside of the casing is a space on the front side of the bottom frame 25 in the indoor unit, and is a space surrounded by the bottom frame 25, the front grill 26, and the front panel 27. The outside of the casing is the space on the back side of the bottom frame 25 in the indoor unit. The inside of the casing 21 and the outside of the casing 21 are partitioned by the bottom frame.

A first space 21a surrounded by a bottom frame 25, a front grill 26, and a front panel 27 is formed inside the casing 21. The first space 21a is the main area within the casing 21. The first space 21a accommodates an in-machine part of the liquid refrigerant connection pipe 31 and an in-machine part of the gas refrigerant connection pipe 32. The first space 21a is an example of a space.

Further, a second space 30a (piping upright portion) is formed on the right side of the bottom frame 25 along the vertical direction. A third space 30b continuous to the lower end of the second space 30a is formed at the rear of the lower part of the bottom frame 25 along the left-right direction.

The liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32 are arranged to extend from the indoor heat exchanger 15 housed in the first space 21a along the second space 30a and the third space 30b. A vertical portion of the liquid refrigerant connection pipe 31 and a vertical portion of the gas refrigerant connection pipe 32 are accommodated in the second space 30a. A horizontal portion of the liquid refrigerant connection pipe 31 and a horizontal portion of the gas refrigerant connection pipe 32 are accommodated in the third space 30b. The liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32 are inserted into an opening provided in a part of the bottom frame 25, and are inserted onto a drain pan 29 (shown in FIGS. 7 and 8) provided in the bottom frame 25. from the casing 21.

The second space 30a is not inside the casing 21 but outside the right side of the bottom frame 25. Further, the third space 30b is not inside the casing 21 but outside the rear of the bottom frame 25. That is, the second space 30a and the third space 30b are located outside the casing 21.

FIG. 6 is a diagram of the indoor heat exchanger 15, the liquid refrigerant connection pipe 31, and the gas refrigerant connection pipe 32 viewed from the front side.

As shown in FIG. 6, the indoor heat exchanger 15 includes a heat exchange section 151 and a plurality of heat transfer tubes 152 passing through the heat exchange section 151 in the left-right direction. This heat exchange section 151 and each heat exchanger tube 152 are each formed of aluminum or an aluminum alloy.

The indoor unit 1 also includes a liquid refrigerant connection pipe 31 fluidly connected to the heat exchanger tube 152 of the indoor heat exchanger 15 and a gas refrigerant connecting pipe 31 fluidly connected to the other heat exchanger tube 152 of the indoor heat exchanger 15 A refrigerant connection pipe 32 is provided. The liquid refrigerant connection pipe 31 is an example of a first connection pipe, and constitutes a part of the communication pipe L1 (shown in FIG. 1). The gas refrigerant connection pipe 32 is an example of a second connection pipe, and constitutes a part of the communication pipe L2 (shown in FIG. 1). The liquid refrigerant connection pipe 31 guides the liquid refrigerant from the electric expansion valve 14 to the indoor heat exchanger 15 during cooling operation and dehumidification operation. On the other hand, the gas refrigerant connection pipe 32 guides the gas refrigerant from the indoor heat exchanger 15 to the compressor 11 during cooling operation and dehumidification operation.

7 is a schematic diagram of the main parts of the indoor heat exchanger 15 seen from the front side, FIG. 8 is a schematic diagram of the main parts of the indoor heat exchanger 15 seen from the front side, and FIG. 9 is a schematic diagram of the main parts of the indoor heat exchanger 15 seen from the front side. It is a side view of the exchanger 15, the liquid refrigerant connection pipe 31, and the gas refrigerant connection pipe 32, viewed from the right side. In FIGS. 7 and 8, 29 is a drain pan disposed within the casing 21 and below the indoor heat exchanger 15.

<Configuration of liquid refrigerant connection pipe 31>
As shown in FIGS. 7 to 9, the liquid refrigerant connection pipe 31 includes a first liquid refrigerant pipe 311 made of aluminum or aluminum alloy and connected to the indoor heat exchanger 15 at one end, and a first liquid refrigerant pipe 311 made of copper or copper alloy. The connecting pipe 313 is formed of stainless steel and connects the other end of the first liquid refrigerant pipe 311 and one end of the second liquid refrigerant pipe 312. The first liquid refrigerant pipe 311 is an example of a first refrigerant pipe. The second liquid refrigerant pipe 312 is an example of a second refrigerant pipe. Aluminum and aluminum alloy are each examples of first metals. Copper and copper alloy are each examples of second metals. The connecting pipe 313 is an example of a third refrigerant pipe.

One end of the second liquid refrigerant pipe 312 is fixed to one end of the connecting pipe 313 (the end opposite to the indoor heat exchanger 15), for example, by brazing, and is arranged in the first space 21a in the casing 21. . The other end of the connecting pipe 313 (the end on the indoor heat exchanger 15 side) is fixed to the other end of the first liquid refrigerant pipe 311, for example, by brazing. At this time, the other end of the first liquid refrigerant pipe 311 is also arranged in the first space 21a within the casing 21, similarly to one end of the second liquid refrigerant pipe 312.

On the other hand, the other end of the second liquid refrigerant pipe 312 is fixed to the liquid refrigerant flare union 41 by brazing, and is arranged outside the first space 21a within the casing 21.

<Configuration of gas refrigerant connection pipe 32>
The gas refrigerant connection pipe 32 includes a first gas refrigerant pipe 321 made of aluminum or an aluminum alloy and connected to the indoor heat exchanger 15 at one end, and a second gas refrigerant pipe 322 made of copper or a copper alloy. , a connecting pipe 323 formed of stainless steel and connecting the other end of the first gas refrigerant pipe 321 and one end of the second gas refrigerant pipe 322. To put it simply, the gas refrigerant connection pipe 32 is configured similarly to the liquid refrigerant connection pipe 31. The first gas refrigerant pipe 321 is an example of a first refrigerant pipe. The second gas refrigerant pipe 322 is an example of a second refrigerant pipe. Aluminum and aluminum alloy are each examples of first metals. Copper and copper alloy are each examples of second metals. The connecting pipe 323 is an example of a third refrigerant pipe.

One end of the second gas refrigerant pipe 322 is fixed to one end of the connecting pipe 323 (the end opposite to the indoor heat exchanger 15), for example, by brazing, and is arranged in the first space 21a within the casing 21. The other end of the connecting pipe 323 (the end on the indoor heat exchanger 15 side) is fixed to the other end of the first gas refrigerant pipe 321, for example, by brazing. At this time, the other end of the first gas refrigerant pipe 321 is also arranged in the first space 21a within the casing 21, similarly to one end of the second gas refrigerant pipe 322.

On the other hand, the other end of the second gas refrigerant pipe 322 is fixed to the gas refrigerant flare union 42 by brazing, and is disposed outside the first space 21a within the casing 21.

<Configuration of the second liquid refrigerant pipe 312 on the side opposite to the indoor heat exchanger 15>
As shown in FIG. 7, the second liquid refrigerant pipe 312 has a first portion 312a extending substantially vertically. The above-mentioned substantially vertical direction means a vertical direction or a direction inclined at an angle of, for example, 20 degrees or less with respect to the vertical direction. Further, the second liquid refrigerant pipe 312 has a second portion 312b closer to the liquid refrigerant flare union 41 than the first portion 312a. The second portion 312b is connected to the lower end of the first portion 312a (the end opposite to the first liquid refrigerant pipe 311), and is bent from the lower end toward the liquid refrigerant flare union 41 side. ing.

Further, the second liquid refrigerant pipe 312 has a third portion 312c closer to the liquid refrigerant flare union 41 than the second portion 312b. This third portion 312c extends substantially horizontally. The above-mentioned substantially horizontal direction means the horizontal direction or a direction inclined at an angle of, for example, 20 degrees or less with respect to the horizontal direction.

<Configuration of the second liquid refrigerant pipe 312 on the indoor heat exchanger 15 side>
The second liquid refrigerant pipe 312 has a fourth portion 312d closer to the indoor heat exchanger 15 than the first portion 312a. The fourth portion 312d is bent downward in a U-turn from the upper end of the first portion 312a (the end opposite to the first liquid refrigerant pipe 311).

Further, the second liquid refrigerant pipe 312 has a fifth portion 312e closer to the indoor heat exchanger 15 than the fourth portion 312d. The fifth portion 312e is an example of a bent portion and is disposed in the first space 21a within the casing 21. Further, the fifth portion 312e extends downward from the end of the fourth portion 312d on the indoor heat exchanger 15 side, then makes a U-turn and is bent upward. In other words, the fifth portion 312e is bent in the first space 21a within the casing 21 so as to protrude downward. Thereby, the fifth portion 312e includes a first slope portion 312e-1 extending diagonally upward toward the heat exchanger side 15, and a second slope portion 312e extending diagonally upward toward the side opposite to the heat exchanger 15. -2. The end of the first slope portion 312e-1 on the indoor heat exchanger 15 side is connected to one end of the connecting pipe 313.

In the first embodiment, as shown in FIGS. 8 and 9, the gas refrigerant connection pipe 32 also has the same shape as the liquid refrigerant connection pipe 31. In other words, the gas refrigerant connection pipe 32 also has a portion corresponding to the first portion 312a to the fifth portion 312e of the liquid refrigerant connection pipe 31. Thereby, the gas refrigerant connection pipe 32 is disposed in the first space 21a within the casing 21 and has a bent portion that is bent so as to protrude downward.

Further, as shown in FIG. 7, in the first space 21a in the casing 21, the second liquid refrigerant pipe 312 is inserted into the cylindrical member 61 so that the outer peripheral surface of the second liquid refrigerant pipe 312 is covered with the cylindrical member 61. It is located. In other words, the portion of the second liquid refrigerant pipe 312 disposed in the first space 21a is inserted into the space inside the cylindrical member 61 in the radial direction. At this time, the outer circumferential surface of the above portion faces the inner circumferential surface of the cylindrical member 61. The cylindrical member 61 is made of a heat insulating material (for example, expanded polyethylene foam).

Further, in the first space 21a inside the casing 21, the first refrigerant pipe 311 is arranged outside the cylindrical member 61, but the connecting pipe 313 is arranged inside the cylindrical member 61. Thereby, the cylindrical member 61 does not cover the outer peripheral surface of the first refrigerant pipe 311 but covers the outer peripheral surface of the connecting pipe 313.

Further, the cylindrical member 61 covers from the outer peripheral surface of the first slope portion 312e-1 to the outer peripheral surface of the second slope portion 312e-2.

Also, outside the first space 21a in the casing 21, the cylindrical member 61 covers each part of the second liquid refrigerant pipe 312, except for the outer peripheral surface of the end of the third portion 312c on the liquid refrigerant flare union 41 side. Covers all outer surfaces.

In addition, in this 1st Embodiment, as shown in FIG. 8, FIG. 9, the outer peripheral surface of the gas refrigerant connection pipe 32 is covered with the cylindrical member 61 similarly to the liquid refrigerant connection pipe 31. In other words, most of the gas refrigerant connection pipe 32 is inserted into the radially inner space of the cylindrical member 61 together with most of the liquid refrigerant connection pipe 31. Thereby, in the first space 21 a in the casing 21 , the second gas refrigerant pipe 322 is arranged within the cylindrical member 61 such that the outer peripheral surface of the second gas refrigerant pipe 322 is covered with the cylindrical member 61 .

Further, the inner diameter of the cylindrical member 61 is set to be larger than the sum of the outer diameter of the liquid refrigerant connection pipe 31 and the outer diameter of the gas refrigerant connection pipe 32.

Moreover, in the first space 21a in the casing 21, the first liquid refrigerant pipe 311 of the liquid refrigerant connection pipe 31 is arranged above the first gas refrigerant pipe 321 of the gas refrigerant connection pipe 32. In other words, the first gas refrigerant pipe 321 of the gas refrigerant connection pipe 32 is arranged below the first liquid refrigerant pipe 311 of the liquid refrigerant connection pipe 31.

In the indoor unit 1 having the above configuration, the indoor heat exchanger 15 is housed in the first space 21a within the casing 21, as shown in FIGS. 7 to 9. Since this indoor heat exchanger 15 functions as an evaporator during cooling operation or dehumidification operation, it is possible to suppress high humidity indoor air from filling the first space 21a in the casing 21.

In the first space 21a in the casing 21, one end of the second liquid refrigerant pipe 312 (second refrigerant pipe) formed of a relatively noble metal (copper or copper alloy in this embodiment) is made of a relatively base metal. It is connected to the other end of a first liquid refrigerant pipe 311 (first refrigerant pipe) formed of aluminum or aluminum alloy in this embodiment. As a result, the connection point between the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312 is located in the first space 21a within the casing 21, so that the possibility of condensation occurring at the connection point is reduced. Therefore, occurrence of electrolytic corrosion in the first liquid refrigerant pipe 311 can be suppressed.

In the first space 21a in the casing 21, one end of the second gas refrigerant pipe 322 (second refrigerant pipe) formed of a relatively noble metal (copper or copper alloy in this embodiment) is made of a relatively base metal. It is connected to the other end of a first gas refrigerant pipe 321 (first refrigerant pipe) made of aluminum or aluminum alloy in this embodiment. As a result, the connection point between the first gas refrigerant pipe 321 and the second gas refrigerant pipe 322 is located in the first space 21a within the casing 21, so that the possibility of dew condensation occurring at the connection point is reduced. Therefore, occurrence of electrolytic corrosion in the first gas refrigerant pipe 321 can be suppressed.

In the first space 21a inside the casing 21, the cylindrical member 61 covers the outer peripheral surface of the second liquid refrigerant pipe 312 made of a relatively noble metal. This makes it difficult for the second liquid refrigerant pipe 312 to come into contact with the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321, which are formed of a relatively base metal. Therefore, the effect of suppressing the occurrence of electrolytic corrosion in the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 can be enhanced.

In the first space 21a inside the casing 21, the cylindrical member 61 covers the outer peripheral surface of the second gas refrigerant pipe 322 made of a relatively noble metal. This makes it difficult for the second gas refrigerant pipe 322 to come into contact with the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321, which are made of a relatively base metal. Therefore, the effect of suppressing the occurrence of electrolytic corrosion in the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 can be enhanced.

Moreover, since the cylindrical member 61 does not cover the outer peripheral surfaces of the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321, the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 tend to dry out. Therefore, the possibility that electrolytic corrosion will occur in the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 can be reduced.

Moreover, since the first liquid refrigerant pipe 311 of the liquid refrigerant connection pipe 31 is connected to the second liquid refrigerant pipe 312 via the connecting pipe 313 (third refrigerant pipe), the first liquid refrigerant pipe 311 and the second The distance between the liquid refrigerant pipe 312 and the liquid refrigerant pipe 312 can be increased. Therefore, it is possible to suppress condensed water from continuing from the outer peripheral surface of the first liquid refrigerant pipe 311 to the outer peripheral surface of the second liquid refrigerant pipe 312.

Since the cylindrical member 61 covers the outer circumferential surface of the connecting pipe 313, even if dew condensation occurs in the second liquid refrigerant pipe 312 inside the cylindrical member 61, the condensed water can be prevented from coming out of the cylindrical member 61. .

Furthermore, even if condensed water continues from the outer peripheral surface of the first liquid refrigerant pipe 311 to the outer peripheral surface of the connecting pipe 313, since the connecting pipe 313 is made of stainless steel, the first liquid refrigerant pipe 311 can reduce the possibility of electrolytic corrosion occurring.

Since the gas refrigerant connection pipe 32 also has the connecting pipe 323 (third refrigerant pipe), it has the same effect as the liquid refrigerant connection pipe 31.

Further, in the first space 21a in the casing 21, a fifth portion 312e (bending portion) that is bent so as to protrude downward in the second liquid refrigerant pipe 312 is arranged, so that The dew condensation water collects at the lower end of the fifth portion 312e due to gravity and drips. As a result, in the first space 21a in the casing 21, it is possible to suppress condensed water from flowing through the second liquid refrigerant pipe 312 and into the first liquid refrigerant pipe 311.

Since the second gas refrigerant pipe 322 also has a bent portion that is bent so as to project downward, it has the same effect as the second liquid refrigerant pipe 312.

In addition, since the first slope portion 312e-1 of the fifth portion 312e extends diagonally upward toward the indoor heat exchanger 15 side, the second slope portion 312e-1 of the second liquid refrigerant pipe 312 It is possible to reliably suppress the condensed water from moving through the second liquid refrigerant pipe 312 to the first liquid refrigerant pipe 311.

Further, since the second slope portion 312e-2 of the fifth portion 312e extends diagonally upward toward the side opposite to the indoor heat exchanger 15, the portion of the second liquid refrigerant pipe 312 on the second slope portion 312e-2 side It becomes easier to collect the condensed water generated in the fifth portion 312e.

The fifth portion 312e of the second gas refrigerant pipe 322 also includes a first inclined portion extending diagonally upward toward the indoor heat exchanger 15 side, and a second inclined portion extending diagonally upward toward the side opposite to the indoor heat exchanger 15. Since the second liquid refrigerant pipe 312 has an inclined portion, it has the same effect as the second liquid refrigerant pipe 312.

Since the outer circumferential surface of the first slope part 312e-1 to the outer circumferential surface of the second slope part 312e-2 is covered with the cylindrical member 61, the outer peripheral surface of the first slope part 312e-1 and the second slope part 312e-2 is Even if the condensed water leaves the first slope section 312e-1 and the second slope section 312e-2, it is possible to prevent the condensed water from adhering to the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321.

Since the first inclined part and the second inclined part of the second gas refrigerant pipe 322 are also covered with the cylindrical member 61, the same effects as those of the first inclined part 312e-1 and the second inclined part 312e-2 are achieved.

Further, the first gas refrigerant pipe 321 generates a larger amount of condensed water than the first liquid refrigerant pipe 311 . At this time, since the first liquid refrigerant pipe 311 is located above the first gas refrigerant pipe 321, the possibility that condensed water dripping from the first gas refrigerant pipe 321 will adhere to the first liquid refrigerant pipe 311 is reduced. be able to.

In the first embodiment, the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312 are fluidly connected to each other via the connecting pipe 313, but they are now fluidly connected to each other directly. Good too. In other words, one end of the second liquid refrigerant pipe 312 may be fluidly connected to the other end of the first liquid refrigerant pipe 311 without using the connecting pipe 313.

In the first embodiment, the cylindrical member 61 covers the outer peripheral surfaces of the connecting pipes 313, 323, but does not cover the outer peripheral surfaces of the connecting pipes 313, 323, and does not cover the outer peripheral surfaces of the connecting pipes 313, 323, and is used for the second liquid refrigerant pipe 312 and the second gas refrigerant pipe. It is also possible to cover only the outer peripheral surface of the pipe 322. In this case, the entire outer peripheral surface of the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322 may be covered with the cylindrical member 61, or the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322 may be covered with the cylindrical member 61. You may make it cover only a part of the outer peripheral surface with the cylinder member 61.

In the first embodiment, the fifth portion 312e of the second liquid refrigerant pipe 312 is arranged inside the cylindrical member 61, but the fifth portion 312e of the second liquid refrigerant pipe 312 is arranged outside the cylindrical member 61. 312e may not be covered with the cylindrical member 61. Similar changes may be made to the second gas refrigerant pipe 322.

In addition, when the fifth portion 312e of the second liquid refrigerant pipe 312 is not covered with the cylindrical member 61, the drain pan 29 receives the condensed water dripping from the fifth portion 312e, and the drain water flows through the drain pipe 33. It may also be drained together with the water.

In the first embodiment, the first liquid refrigerant pipe 311 of the liquid refrigerant connection pipe 31 is arranged above the first gas refrigerant pipe 321 of the gas refrigerant connection pipe 32, but the liquid refrigerant connection pipe The first liquid refrigerant pipes 311 of 31 and the first gas refrigerant pipes 321 of gas refrigerant connection pipes 32 may be arranged adjacent to each other in the horizontal direction.

[Second embodiment]
FIG. 10 is a schematic diagram of the main parts of the indoor unit according to the second embodiment of the present disclosure, viewed from the front side.

The indoor unit is the same as the indoor unit 1 of the first embodiment, except that it includes a resin fixing band 71 that fixes the cylindrical member 61 to the liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32. are configured similarly.

The fixing band 71 is an example of a fixing member, and has the same configuration as a binding band for bundling cables. This fixing band 71 is wound around the outer peripheral surface of the cylindrical member 61 so that the cylindrical member 61 is pressed against the outer peripheral surfaces of the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322. The fixing band 71, like the indoor heat exchanger 15, is accommodated in the first space 21a within the casing 21 (see FIGS. 7 and 8).

The indoor unit having the above configuration has the same effects as the indoor unit 1 of the first embodiment.

Moreover, since the cylindrical member 61 is fixed to the liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32 with the fixing band 71, the cylindrical member 61 is fixed to the refrigerant connection pipe 31 and the gas refrigerant connection pipe 32. Misalignment can be suppressed.

Furthermore, by wrapping the fixing band 71 around the outer peripheral surface of the cylindrical member 61, the cylindrical member 61 is pressed against the outer peripheral surfaces of the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322, so that the second liquid refrigerant pipe 312 and Movement of condensed water along the second gas refrigerant pipe 322 can be suppressed by the cylinder member 61.

Further, by wrapping the fixing band 71 around the outer peripheral surface of the cylindrical member 61, the cylindrical member 61 is pressed against the outer peripheral surfaces of the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322, so that the indoor heat exchange of the cylindrical member 61 is Air can be prevented from flowing into the cylindrical member 61 from the opening on the side of the container 15. Therefore, the occurrence of dew condensation within the cylindrical member 61 can be suppressed.

In the second embodiment, the fixing band 71 is wound around the outer peripheral surface of the cylindrical member 61 so that the cylindrical member 61 is pressed against the outer peripheral surfaces of the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322. As shown in FIG. 11, the cylindrical member 61 may be wound around the outer circumferential surface of the cylindrical member 61 so as to be pressed against the outer periphery of the connecting pipes 313, 323. In this case as well, the same effects as the indoor unit of the second embodiment described above are achieved.

When the fixing band 71 is wrapped around the outer peripheral surface of the cylindrical member 61 so that the cylindrical member 61 is pressed against the outer periphery of the connecting pipes 313, 323, the portion of the outer periphery of the connecting pipes 313, 323 where the cylindrical member 61 contacts. Condensation water tends to accumulate in the vicinity. At this time, since the connecting pipes 313 and 323 are made of stainless steel, the possibility of electrolytic corrosion occurring near these parts is reduced.

In addition, in that case, the fixing band 71 is wrapped around the outer circumferential surface of the cylindrical member 61, so that the cylindrical member 61 is pressed against the outer circumferential surface of the connecting pipes 313, 323. The cylindrical member 61 can suppress movement of condensed water along the line.

In the second embodiment, the resin fixing band 71 is made of resin, but may be made of another material (for example, metal).

[Third embodiment]
FIG. 12 is a schematic diagram of the main parts of the indoor unit according to the third embodiment of the present disclosure, viewed from the front side.

The above-mentioned indoor unit has the above-mentioned indoor unit except that the angle at which the first liquid refrigerant pipe 311 is inclined with respect to the horizontal direction and the angle at which the first gas refrigerant pipe 321 is inclined with respect to the horizontal direction are different from each other. It is configured similarly to the indoor unit of the second embodiment.

For example, when the first liquid refrigerant pipe 311 is inclined at an angle of 50 degrees with respect to the horizontal direction, the first gas refrigerant pipe 321 is inclined at an angle of 70 degrees with respect to the horizontal direction.

The indoor unit with the above configuration has the same effects as the indoor unit of the second embodiment.

Further, since the angle at which the first liquid refrigerant pipe 311 is inclined with respect to the horizontal direction is different from the angle at which the first gas refrigerant pipe 321 is inclined with respect to the horizontal direction, the first gas refrigerant pipe is connected to the first liquid refrigerant pipe 311. Even if the arrangement in which the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 are arranged close to each other is adopted, it is possible to reduce the possibility that condensed water will be retained in the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321.

[Fourth embodiment]
FIG. 13 is a schematic diagram of the main parts of the indoor unit according to the fourth embodiment of the present disclosure, viewed from the front side.

The indoor unit has the following points: the gas refrigerant connection pipe 32 is formed so that the connection pipe 323 intersects the connection pipe 313, and the fixing band 71 is arranged around the connection pipes 313, 323. Except for this, the indoor unit is configured similarly to the indoor unit of the third embodiment.

The fixing band 71 is wound around the outer circumferential surface of the cylindrical member 61 so that the cylindrical member 61 is pressed against the outer circumferential surface of the connecting pipes 313 and 323.

The indoor unit with the above configuration has the same effects as the indoor unit of the third embodiment.

In addition, by arranging the fixing band 71 around the connecting pipes 313 and 323, which are the points where the liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 32 intersect, the liquid refrigerant connection pipe 31 and the gas refrigerant connection pipe 31 can The cylindrical member 61 can be firmly fixed to the connecting pipe 32.

In the fourth embodiment, the connecting pipe 313 and the connecting pipe 323 intersect with each other, and the fixing band 71 is arranged around the intersecting part, but the second liquid refrigerant pipe 312 and the second gas The refrigerant pipes 322 may be intersected with each other, and the fixing band 71 may be arranged around the intersecting portion.
[Fifth embodiment]
FIG. 14 is a schematic diagram of the main parts of the indoor unit according to the fifth embodiment of the present disclosure, viewed from the front side.

The indoor unit has the same structure as the indoor unit of the second embodiment, except that it does not include the connecting pipes 313 and 323 and includes waterproof tubes 81 and 82.

The other end of the first liquid refrigerant pipe 311 (the end opposite to the indoor heat exchanger 15) is directly connected to one end of the second liquid refrigerant pipe 312 (the end on the indoor heat exchanger 15 side), for example, by brazing. ing. The waterproof tube 81 is in close contact with the connection between the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312, and covers the connection. This connection part is connected to the other end of the first liquid refrigerant pipe 311 (the end on the second liquid refrigerant pipe 312 side) and one end of the second liquid refrigerant pipe 312 (the end on the first liquid refrigerant pipe 311 side). including. The waterproof tube 81 is an example of a covering member.

The other end of the first gas refrigerant pipe 321 (the end opposite to the indoor heat exchanger 15) is directly connected to one end of the second gas refrigerant pipe 322 (the end on the indoor heat exchanger 15 side), for example, by brazing. ing. The waterproof tube 82 is in close contact with the outer peripheral surface of the connecting portion between the first gas refrigerant pipe 321 and the second gas refrigerant pipe 322, and covers the outer peripheral surface of the connecting portion. This connection part is connected to the other end of the first gas refrigerant pipe 321 (end on the second gas refrigerant pipe 322 side) and one end of the second gas refrigerant pipe 322 (end on the first gas refrigerant pipe 321 side). including. The waterproof tube 82 is an example of a covering member.

The waterproof tubes 81 and 82 are arranged within the cylindrical member 61 so as to be covered by the cylindrical member 61. The waterproof tubes 81 and 82 may be formed by heating and shrinking tubes made of a waterproof material (eg, vinyl chloride, silicone rubber, fluorine-based polymer, etc.).

The indoor unit with the above configuration has the same effects as the indoor unit of the second embodiment.

Further, since the waterproof tube 81 covers the outer circumferential surface of the connecting portion between the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312, the possibility of electrolytic corrosion occurring in the first liquid refrigerant pipe 311 can be reduced.

Since the waterproof tube 82 covers the outer peripheral surface of the connecting portion between the first gas refrigerant pipe 321 and the second gas refrigerant pipe 322, the possibility that electrolytic corrosion will occur in the first gas refrigerant pipe 321 can be reduced.

In the fifth embodiment, the outer peripheral surface of the connection between the first liquid refrigerant pipe 311 and the second liquid refrigerant pipe 312 is covered with the waterproof tube 81, but the outer peripheral surface of the connection is covered with a coating film. You can do it like this. This coating film is made of a waterproof material (eg, fluororesin, FRP (fiber reinforced plastic), acrylic rubber, etc.). Moreover, the above-mentioned material may have heat resistance or elasticity.

In addition, similarly to the outer circumferential surface of the connecting portion between the first liquid refrigerant piping 311 and the second liquid refrigerant piping 312, the outer peripheral surface of the connecting portion between the first gas refrigerant piping 321 and the second gas refrigerant piping 322 is coated with a coating film. It may be covered with

Although the fifth embodiment does not use the fixing band 71 described in the second to fourth embodiments, the fixing band 71 may be used. In this case, the fixing band 71 may be wrapped around the outer peripheral surface of the cylindrical member 61 so that the cylindrical member 61 is pressed against the outer peripheral surface of the waterproof tubes 81 and 82, as shown in FIG.
When the cylindrical member 61 is pressed against the outer periphery of the waterproof tube 81 by wrapping it around the outer periphery of the cylindrical member 61, the same effects as in the modification shown in FIG. 11 can be obtained.
When the cylindrical member 61 is pressed against the outer circumferential surface of the waterproof tube 81, condensed water tends to accumulate near the portions of the outer circumferential surfaces of the waterproof tubes 81, 82 where the cylindrical member 61 contacts. At this time, since the waterproof tubes 81 and 82 have waterproof properties, it is possible to reduce the possibility that electrolytic corrosion will occur in the first refrigerant pipe.

In the air conditioners of the first to fourth embodiments described above, one indoor unit 1 is connected to one outdoor unit 2, but a plurality of indoor units 1 may be connected. In other words, although the above air conditioners are of a pair type, they may be of a multi-type.

In the first to fourth embodiments described above, the first liquid refrigerant pipe 311 and the first gas refrigerant pipe 321 as the first refrigerant pipe are made of aluminum or an aluminum alloy, but they are made of a metal other than aluminum or an aluminum alloy. may be formed.

In the first to fourth embodiments described above, the second liquid refrigerant pipe 312 and the second gas refrigerant pipe 322 as the second refrigerant pipe are made of copper or a copper alloy, but they are made of a metal other than copper or a copper alloy. It is sufficient that the first refrigerant pipe is made of a metal that is noble in potential with respect to the metal of the first refrigerant pipe.

In the first to fourth embodiments described above, the connecting pipes 313 and 323 are made of stainless steel, but may be made of a highly corrosion-resistant material other than stainless steel, for example.

In the first to fourth embodiments described above, a waterproof tube or a coating film that closely contacts the outer circumferential surface of the connecting pipes 313, 323 and their surrounding areas may be used. This waterproof tube may be formed by heating and shrinking a tube made of a waterproof material (eg, vinyl chloride, silicone rubber, fluorine-based polymer, etc.). Further, the coating film is made of a waterproof material (eg, fluororesin, FRP (fiber reinforced plastic), acrylic rubber, etc.). Moreover, the above-mentioned material may have heat resistance or elasticity.

In the first to fourth embodiments described above, the indoor heat exchanger 15 and the first liquid refrigerant pipe 311 were connected in the liquid refrigerant connection pipe 31, but the connection between the indoor heat exchanger 15 and the first liquid refrigerant pipe 311 was A plurality of first liquid refrigerant pipes 311 may be connected to the indoor heat exchanger 15 with a flow divider interposed therebetween.In the first to fourth embodiments described above, in the gas refrigerant connection pipe 32, the indoor heat exchange However, a flow divider is interposed between the indoor heat exchanger 15 and the first gas refrigerant pipe 321, and a plurality of first gas refrigerants are connected to the indoor heat exchanger 15. A pipe 311 may be connected.

Although specific embodiments of the present disclosure have been described, the present disclosure is not limited to the first to fourth embodiments described above, and can be implemented with various changes within the scope of the present disclosure. For example, one embodiment of the present disclosure may be obtained by applying a modification of the first embodiment to the second to fourth embodiments.

1 Indoor unit 15 Indoor heat exchanger 21 Casing 21a First space 22 Suction port 23 Air outlet 24 Horizontal flap 25 Bottom frame 26 Front grill 27 Front panel 28 Electrical components 29 Drain pan 30a Second space 30b Third space 31 For liquid refrigerant Connection piping (first connection piping)
32 Gas refrigerant connection pipe (second connection pipe)
33 Drain pipe 41 Flare union for liquid refrigerant 42 Flare union for gas refrigerant 61 Cylindrical member 71 Fixing band 81 Waterproof tube 82 Waterproof tube 151 Heat exchange section 152 Heat transfer tube 311 First liquid refrigerant pipe (first refrigerant pipe)
312 Second liquid refrigerant pipe (second refrigerant pipe)
312a First part 312b Second part 312c Third part 312d Fourth part 312e Fifth part 313 Connecting pipe (third refrigerant pipe)
321 First gas refrigerant pipe (first refrigerant pipe)
322 Second gas refrigerant pipe (second refrigerant pipe)
323 Connecting pipe (third refrigerant pipe)

Claims (15)

a casing (21);
a heat exchanger (15) housed in a space (21a) within the casing (21);
It includes connecting pipes (31, 32) connected to the heat exchanger (15) and through which a refrigerant flows, and a cylindrical member (61),
The above connection piping (31, 32) is
a first refrigerant pipe (311, 321) formed of metal and having one end connected to the heat exchanger (15);
a second refrigerant pipe (312, 322) formed of a metal that is potentially nobler than the metal of the first refrigerant pipe (311, 321);
One end of the second refrigerant pipe (312, 322) is connected to the other end of the first refrigerant pipe (311, 321) in the space (21a) in the casing (21),
In the space (21a) in the casing (21), the second refrigerant pipe (312, 322) is arranged such that the outer peripheral surface of the second refrigerant pipe (312, 322) is covered with the cylindrical member (61). An indoor unit (1) disposed within the cylindrical member (61). In the indoor unit (1) according to claim 1,
The first refrigerant pipe (311, 321) is arranged outside the cylindrical member (61) so that the outer peripheral surface of the first refrigerant pipe (311, 321) is not covered by the cylindrical member (61). Indoor unit (1). In the indoor unit (1) according to claim 1 or 2,
The connection pipes (31, 32) connect a third refrigerant pipe (313, 323) that connects the other end of the first refrigerant pipe (311, 321) and one end of the second refrigerant pipe (312, 322). Prepare,
The third refrigerant pipe (313, 323) is arranged inside the cylindrical member (61) so that the outer peripheral surface of the third refrigerant pipe (313, 323) is covered with the cylindrical member (61). Machine (1). In the indoor unit (1) according to claim 3,
The third refrigerant pipe (313, 323) of the indoor unit (1) is made of stainless steel. In the indoor unit (1) according to claim 1 or 2,
The second refrigerant pipe (312, 322) is arranged in the space (21a) in the casing (21), and includes a bent portion (312e) that is bent so as to protrude downward. In the indoor unit (1) according to claim 5,
The bent portion (312e) is
a first slope portion (312e-1) extending obliquely upward toward the heat exchanger (15);
a second slope portion (312e-2) extending diagonally upward toward the opposite side of the heat exchanger (15);
The cylindrical member (61) is an indoor unit (1) that covers from the outer peripheral surface of the first slope part (312e-1) to the outer peripheral surface of the second slope part (312e-2). In the indoor unit (1) according to claim 1 or 2,
a fixing member (71) for fixing the cylindrical member (61) to the connecting pipe (31, 32);
An indoor unit (1) in which the fixing member (71) is wrapped around the outer peripheral surface of the cylindrical member (61) so that the cylindrical member (61) is pressed against the outer peripheral surface of the connecting pipes (31, 32). In the indoor unit (1) according to claim 7,
The indoor unit ( 1 ). In the indoor unit (1) according to claim 3,
a fixing member (71) for fixing the cylindrical member (61) to the connecting pipe (31, 32);
The fixing member (71) is wrapped around the outer peripheral surface of the cylindrical member (61) so that the cylindrical member (61) is pressed against the outer peripheral surface of the third refrigerant pipe (313, 323). . In the indoor unit (1) according to claim 1 or 2,
The connection pipes (31, 32) include a first connection pipe (31) and a second connection pipe (32),
The first connection pipe (31) and the second connection pipe (32) each include the first refrigerant pipe (311, 321) and the second refrigerant pipe (312, 322),
The first connecting pipe (31) is a liquid pipe, while the second connecting pipe (32) is a gas pipe,
The first refrigerant pipe (311) of the first connection pipe (31) and the first refrigerant pipe (321) of the second connection pipe (32) are adjacent to each other in the horizontal direction, or The first refrigerant pipe (311) of the connection pipe (31) is located above the first refrigerant pipe (321) of the second connection pipe (32) of the indoor unit (1). In the indoor unit (1) according to claim 1 or 2,
The connection pipes (31, 32) include a first connection pipe (31) and a second connection pipe (32),
The first connection pipe (31) and the second connection pipe (32) each include the first refrigerant pipe (311, 321) and the second refrigerant pipe (312, 322),
The first refrigerant pipe (311) of the first connection pipe (31) is a liquid pipe inclined at a first angle with respect to the horizontal direction, while the first refrigerant pipe of the second connection pipe (32) (321) is an indoor unit (1) which is a gas pipe that is inclined at a second angle different from the first angle with respect to the horizontal direction. In the indoor unit (1) according to claim 1 or 2,
a fixing member (71) for fixing the cylindrical member (61) to the connecting pipe (31, 32);
The connection pipes (31, 32) include a first connection pipe (31) and a second connection pipe (32),
The fixing member (71) is attached to the cylindrical member (61) so that the cylindrical member (61) is pressed against the outer peripheral surface of the first connecting pipe (31) and the outer peripheral surface of the second connecting pipe (32). wrapped around the outer circumferential surface of
The fixing member (71) is an indoor unit (1) arranged around a location where the first connection pipe (31) and the second connection pipe (32) intersect. In the indoor unit (1) according to claim 1 or 2,
A coating member (51) or a coating film is provided, which closely contacts the connection portion between the first refrigerant pipe (311, 321) and the second refrigerant pipe (312, 322), and covers the connection portion;
The indoor unit (1), wherein the covering member (51) or coating film is disposed within the cylindrical member (61) so that the covering member (51) or the coating film is covered with the cylindrical member (61). In the indoor unit (1) according to claim 13,
A fixing member (71) for fixing the cylindrical member (61) to the connecting pipe (31, 32),
An indoor unit (1) in which the fixing member (71) is wrapped around the outer peripheral surface of the cylindrical member (61) so that the cylindrical member (61) is pressed against the outer peripheral surface of the covering member (51) or the coating film. . An air conditioner comprising the indoor unit (1) according to claim 1 or 2.

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