JP2015124983A - Air-conditioner indoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioner indoor unit that is a wall-mounted air-conditioner indoor unit, that can make inlet/outlet pipes less damaged even if a force is applied to the inlet/outlet pipes connected to a communication pipe between the air-conditioner indoor unit and an air-conditioner outdoor unit, and that can make simpler work such as installation work.SOLUTION: An air-conditioner indoor unit 10 is a wall-mounted air-conditioner indoor unit connected to an air-conditioner outdoor unit via a communication pipe. The air-conditioner indoor unit comprises an indoor heat exchanger 20 and a liquid-refrigerant indoor-refrigerant pipe assembly 60. The liquid-refrigerant indoor-refrigerant pipe assembly 60 includes a liquid-refrigerant large-diameter pipe 61 and a liquid-refrigerant small-diameter pipe 65. The liquid-refrigerant large-diameter pipe 61 is connected to the communication pipe. The liquid-refrigerant small-diameter pipe 65 is connected to the indoor heat exchanger 20 and communicates the indoor heat exchanger 20 with the liquid-refrigerant large-diameter pipe 61. The liquid-refrigerant large-diameter pipe 61 includes a trap 66 formed therein, the trap 66 including a first curved portion 66a curved into U-shape on a first flat surface; and a second curved portion 66b curved into a U-shape on a second flat surface crossing the first flat surface.

Description

  The present invention relates to an air conditioning indoor unit, and more particularly to a wall-mounted air conditioning indoor unit.

  Conventionally, in a wall-mounted air-conditioning indoor unit, the indoor heat exchanger of the air-conditioning indoor unit is connected to a communication pipe that connects the air-conditioning indoor unit and the air-conditioning outdoor unit via an entrance / exit pipe (for example, Patent Document 1 ( JP, 2004-163018, A)). The inlet / outlet pipe is designed to have the same pipe diameter as the heat transfer pipe at the connection with the heat exchanger.

  By the way, in recent years, in order to improve the heat exchange efficiency of the indoor heat exchanger, it is required to reduce the diameter of the heat transfer tube. In connection with this, the pipe diameter of the connection part of the inlet / outlet pipe with the indoor heat exchanger is also reduced. Therefore, when an operator applies force to the entrance / exit piping during work such as installation of an air conditioner, damage may occur particularly in the narrow diameter portion of the entrance / exit piping. Therefore, it is necessary for the worker to install the air conditioner etc. very carefully, which leads to an increase in the number of work steps.

  An object of the present invention is a wall-mounted air conditioning indoor unit, and even when a force is applied to an entrance / exit pipe connected to a communication pipe between the air conditioning indoor unit and the air conditioning outdoor unit, the entrance / exit pipe is hardly damaged. An object of the present invention is to provide an air conditioning indoor unit that is easy to install.

  The air-conditioning indoor unit according to the first aspect of the present invention is a wall-hanging air-conditioning indoor unit that is connected to an air-conditioning outdoor unit via a communication pipe. The air conditioning indoor unit includes an indoor heat exchanger and an indoor refrigerant pipe assembly. The indoor refrigerant piping assembly includes a large diameter pipe and a small diameter pipe. The large diameter pipe is connected to the communication pipe. The small diameter pipe is connected to the indoor heat exchanger, and communicates the indoor heat exchanger with the large diameter pipe. The large-diameter pipe includes a first bent portion that bends in a U shape on the first plane, and a second bent in a U shape on the second plane that is disposed in the vicinity of the first bent portion and intersects the first plane. A trap including a bent portion is formed.

  Here, the large-diameter pipe of the indoor refrigerant pipe assembly serving as the inlet / outlet pipe is provided with a first bent portion and a second bent portion that bends on a second plane that intersects the first plane where the first bent portion bends. It has been. For this reason, when the air-conditioning indoor unit is installed or the like, no matter which direction of force is applied to the indoor refrigerant piping assembly, the small diameter pipe of the indoor refrigerant piping assembly is formed by the first bent portion and the second bent portion. The force acting on the is easy to be reduced. As a result, the indoor refrigerant piping assembly is not easily damaged, and operations such as installation of the air conditioning indoor unit are likely to be facilitated.

  An air conditioning indoor unit according to a second aspect of the present invention is the air conditioning indoor unit according to the first aspect, wherein the large-diameter pipe has a first part extending in the horizontal direction and a second part extending upward from the first part. And a third part extending from the second part and connected to the small diameter tube. The trap is formed in the third part.

  Here, since the trap is formed in the third part of the large diameter pipe connected to the small diameter pipe, the force acting on the small diameter pipe of the indoor refrigerant piping assembly is likely to be reduced.

  The air conditioning indoor unit according to the third aspect of the present invention is the air conditioning indoor unit according to the first aspect or the second aspect, and the second plane is orthogonal to the first plane.

  Here, since the second plane where the second bent portion bends is orthogonal to the first plane where the first bent portion bends, any direction of force is applied to the indoor refrigerant piping assembly when the air conditioning indoor unit is installed or the like. Even if added, the force acting on the small-diameter pipe of the indoor refrigerant piping assembly is likely to be reduced by the first bent portion and the second bent portion.

  An air conditioning indoor unit according to a fourth aspect of the present invention is the air conditioning indoor unit according to any of the first to third aspects, and the large-diameter pipe is connected to a communication pipe for liquid refrigerant.

  Here, when the large-diameter pipe is connected to the liquid refrigerant communication pipe, that is, when the indoor refrigerant pipe assembly is an indoor refrigerant pipe assembly for liquid refrigerant, the small-diameter pipe of the indoor refrigerant pipe assembly is used. Damage can be suppressed.

  An air conditioning indoor unit according to a fifth aspect of the present invention is the air conditioning indoor unit according to the fourth aspect, wherein the indoor refrigerant pipe assembly includes a large-diameter pipe and an indoor heat exchanger by a single small-diameter pipe. Communicate.

  When the indoor refrigerant piping assembly for liquid refrigerant is connected to the indoor heat exchanger by a single small-diameter pipe, damage is particularly likely to occur in the small-diameter pipe. Here, since the trap is provided in the indoor refrigerant pipe assembly, it is possible to reduce the force acting on the small-diameter pipe, and it is possible to suppress the occurrence of damage occurring in the indoor refrigerant pipe assembly for liquid refrigerant.

  An air conditioning indoor unit according to a sixth aspect of the present invention is the air conditioning indoor unit according to the fourth aspect, wherein the indoor refrigerant pipe assembly splits the refrigerant flow path from a large diameter pipe into two small diameter pipes It further has a vessel.

  Even when the indoor refrigerant piping assembly for liquid refrigerant is connected to the indoor heat exchanger by two small diameter tubes, the small diameter tubes are likely to be damaged. Here, since the trap is provided in the indoor refrigerant pipe assembly, it is possible to reduce the force acting on the small-diameter pipe, and it is possible to suppress the occurrence of damage occurring in the indoor refrigerant pipe assembly for liquid refrigerant.

  An air conditioning indoor unit pertaining to a seventh aspect of the present invention is the air conditioning indoor unit pertaining to any of the fourth to sixth aspects, further comprising an indoor refrigerant piping assembly for gas refrigerant. The indoor refrigerant piping assembly for gas refrigerant has a large diameter pipe for gas refrigerant and a small diameter pipe for gas refrigerant. The large diameter pipe for gas refrigerant is connected to the connecting pipe for gas refrigerant. The small-diameter pipe for gas refrigerant is connected to the indoor heat exchanger, and communicates the indoor heat exchanger with the large-diameter pipe for gas refrigerant. A trap is formed only in a large diameter pipe among a large diameter pipe and a large diameter pipe for gas refrigerant. The indoor refrigerant piping assembly for gas refrigerant further includes a flow divider that branches the refrigerant flow path from the large diameter pipe for gas refrigerant to at least three small diameter pipes for gas refrigerant.

  Here, the trap is provided in the indoor refrigerant piping assembly for the liquid refrigerant. On the other hand, three or more small-diameter pipes for gas refrigerant are connected to the indoor heat exchanger, and no trap is provided in the indoor refrigerant pipe assembly for gas refrigerant that is relatively difficult to damage. . For this reason, about the indoor refrigerant | coolant piping assembly for gas refrigerant | coolants, the man-hour of the piping process for providing a trap can be reduced.

  An air conditioning indoor unit according to an eighth aspect of the present invention is the air conditioning indoor unit according to any one of the first to seventh aspects, and the outer diameter of the small diameter tube is 5 mm or less.

  When the outer diameter of the thin tube is as thin as 5 mm or less, the thin tube is easily damaged by a relatively small force. Here, even if it is a small diameter pipe | tube with an outer diameter of 5 mm or less by providing a trap in a large diameter pipe | tube, the damage can be suppressed. Therefore, the outer diameter of the small-diameter pipe of the indoor refrigerant pipe assembly can be reduced in accordance with the reduction in the diameter of the heat transfer pipe of the indoor heat exchanger.

  In the air conditioning indoor unit pertaining to the first aspect of the present invention, the large-diameter pipe of the indoor refrigerant pipe assembly serving as the inlet / outlet pipe is on the second plane intersecting the first plane where the first bend and the first bend are bent. And a second bend portion that bends at. For this reason, when the air-conditioning indoor unit is installed or the like, no matter which direction of force is applied to the indoor refrigerant piping assembly, the small diameter pipe of the indoor refrigerant piping assembly is formed by the first bent portion and the second bent portion. The force acting on the is easy to be reduced. As a result, the indoor refrigerant piping assembly is not easily damaged, and operations such as installation of the air conditioning indoor unit are likely to be facilitated.

  In the air conditioning indoor unit according to the second and third aspects of the present invention, the force acting on the small-diameter pipe of the indoor refrigerant pipe assembly is likely to be reduced.

  In the air conditioning indoor unit according to the fourth to sixth aspects of the present invention, it is possible to suppress damage to the small-diameter pipe of the liquid refrigerant indoor refrigerant pipe assembly.

  In the air conditioning indoor unit pertaining to the seventh aspect of the present invention, the number of man-hours for pipe processing for providing a trap can be reduced for the gas refrigerant indoor refrigerant pipe assembly in which the gas refrigerant small diameter pipe is less likely to be damaged.

  In the air conditioning indoor unit pertaining to the eighth aspect of the present invention, the outer diameter of the small-diameter pipe of the indoor refrigerant pipe assembly can be reduced in accordance with the reduction in the diameter of the heat transfer pipe of the indoor heat exchanger.

It is an external view of the air conditioner which has an air-conditioning indoor unit which concerns on one Embodiment of this invention. It is the figure which looked at the piping connection condition to an indoor heat exchanger from the front of an air-conditioning indoor unit in the state which removed the casing of the air-conditioning indoor unit of FIG. It is the figure which looked at the piping connection condition to an indoor heat exchanger from the right side of an air-conditioning indoor unit in the state which removed the casing of the air-conditioning indoor unit of FIG. It is the figure which looked at the indoor refrigerant | coolant piping assembly for liquid refrigerants of the air conditioning indoor unit of FIG. 2 from the front of the air conditioning indoor unit. It is the figure which looked at the indoor refrigerant | coolant piping assembly for liquid refrigerants of the air conditioning indoor unit of FIG. 2 from the upper direction of the air conditioning indoor unit. It is the figure which looked at the indoor refrigerant | coolant piping assembly for liquid refrigerants of the air conditioning indoor unit of FIG. 2 from the left side of the air conditioning indoor unit. It is the figure which looked at the indoor refrigerant piping assembly for liquid refrigerants of the air-conditioning indoor unit concerning modification A from the upper part of the air-conditioning indoor unit. It is the figure which looked at the indoor refrigerant piping assembly for liquid refrigerants of the air-conditioning indoor unit concerning modification B from the front of the air-conditioning indoor unit.

  Hereinafter, an air conditioning indoor unit 10 according to an embodiment of the air conditioning indoor unit of the present invention will be described with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention. The following embodiments can be appropriately changed without departing from the gist of the present invention.

(1) Overall configuration of air conditioner The air conditioner indoor unit 10 is a device that constitutes a part of the air conditioner 100. The air conditioner 100 includes an air conditioner indoor unit 10, an air conditioner outdoor unit 50, and a communication pipe 40. The air conditioning indoor unit 10 is connected to the air conditioning outdoor unit 50 via a communication pipe 40. The connection pipe 40 connects the indoor heat exchanger 20 accommodated in the air conditioning indoor unit 10 and the compressor, outdoor heat exchanger, expansion valve, etc. (not shown) accommodated in the air conditioning outdoor unit 50 to constitute a refrigerant circuit. To do. The air conditioner 100 cools and heats the space in which the air conditioning indoor unit 10 is installed by circulating the refrigerant in the refrigerant circuit.

  In addition, although the air conditioner 100 can implement air conditioning here, it is not limited to this, The air conditioner only for cooling or for heating may be sufficient.

(2) Detailed Configuration of Air Conditioning Indoor Unit The air conditioning indoor unit 10 will be described. In the following, in order to explain the positional relationship and the like, expressions such as “front (front)” and “rear (front)” may be used. However, unless otherwise specified, a casing described later is used. 11 is the front (front) side of the front panel 11a (see FIG. 1). In addition, expressions such as “front (front)”, “rear (front)”, “front”, “back”, “left”, “right”, etc., used for explaining the positional relationship and the like are not particularly noted. As long as it follows the directions indicated by the arrows in FIGS.

  Further, in the following, in order to represent directions, in the state where the air conditioning indoor unit 10 is viewed from the front (front panel 11a side), the left-right direction is the X-axis direction, the front-rear direction is the Y-axis direction, and the up-down direction is the Z-axis direction Sometimes called. Furthermore, in the following, in order to explain the plane, planes extending in the left-right direction and the up-down direction when the air-conditioning indoor unit 10 is viewed from the front side (front panel 11a side) The spreading plane may be called an XY plane Pxy, and the plane spreading in the front-rear direction and the vertical direction may be called a YZ plane Pyz.

  The air conditioning indoor unit 10 is a wall-hanging type, and is attached to the wall of the space where the air conditioning indoor unit 10 is installed. The air conditioning indoor unit 10 includes a casing 11 (see FIG. 1), an indoor heat exchanger 20 (see FIG. 2), a liquid refrigerant indoor refrigerant pipe assembly 60 and a gas refrigerant indoor refrigerant pipe assembly 70 (see FIG. 2). ) And a fan and a filter (not shown). Inside the casing 11, the indoor heat exchanger 20, a fan, and a filter are accommodated. The liquid refrigerant indoor refrigerant pipe assembly 60 and the gas refrigerant indoor refrigerant pipe assembly 70 are connected to the liquid refrigerant communication pipe 40 and the gas refrigerant communication pipe 40, respectively.

  The indoor heat exchanger 20 has a plurality of heat transfer tubes 21 (see FIG. 2). The heat transfer pipe 21 is connected to the heat transfer pipes 21 so that the refrigerant flows through the indoor heat exchanger 20, the liquid refrigerant indoor refrigerant pipe assembly 60, and the gas refrigerant indoor refrigerant pipe assembly 70. Is connected.

  When a fan (not shown) is driven, air in the air-conditioning target space of the air conditioner 100 is taken in from an inlet 12 (see FIG. 1) formed in the upper part of the casing 11. The air taken in from the inlet 12 by the fan passes through a filter (not shown) and is supplied to the indoor heat exchanger 20. When air passes through the filter, dust contained in the air is removed. When the air supplied to the indoor heat exchanger 20 passes through a plurality of fins (not shown) through which the heat transfer tubes 21 of the indoor heat exchanger 20 are inserted, the air flows between the air flowing through the heat transfer tubes 21. Perform heat exchange. The air that has passed through the fins of the indoor heat exchanger 20 is blown out from the air outlet 13 (see FIG. 1) formed in the lower portion of the casing 11 to the air-conditioning target space.

  Hereinafter, the indoor heat exchanger 20, the liquid refrigerant indoor refrigerant pipe assembly 60, and the gas refrigerant indoor refrigerant pipe assembly 70 will be described in particular.

(2-1) Indoor Heat Exchanger In the indoor heat exchanger 20 (see FIGS. 2 and 3), heat exchange between the air taken in from the inlet 12 by the fan and the refrigerant flowing through the heat transfer tube 21 is performed.

  The indoor heat exchanger 20 is arranged such that a first heat exchange unit 20a located on the front side of the air conditioning indoor unit 10 and a second heat exchange unit 20b located on the back side are connected in an inverted V shape in a side view. (See FIG. 3). The indoor heat exchanger 20 is attached so as to surround the front, upper, and rear of a fan (not shown). The second heat exchanging part 20b is arranged so that the upper end is inclined forward and the rear upper part is covered from above the fan. The first heat exchange unit 20a is disposed so that the upper end is inclined rearward and covers the upper and front sides of the fan.

  The indoor heat exchanger 20 includes a plurality of heat transfer tubes 21 (see FIG. 2) and a plurality of fins (not shown) through which the heat transfer tubes are inserted. The heat transfer tube 21 is a tube having an outer diameter of 5 mm. Each heat transfer tube 21 extends linearly in the horizontal direction (left-right direction) and has insertion portions 22 for inserting pipes at both ends. Connected to the insertion portion 22 is a connection pipe 23 (see FIG. 2) for connecting the heat transfer tubes 21 to each other, a liquid refrigerant indoor refrigerant pipe assembly 60 and a gas refrigerant indoor refrigerant pipe assembly 70. The insertion portion 22 is connected to the connecting pipe 23, the liquid refrigerant small-diameter pipe 65 (see FIG. 3) of the liquid refrigerant indoor refrigerant pipe assembly 60 described later, and the gas of the gas refrigerant indoor refrigerant pipe assembly 70 described later. The pipe is expanded so that a small-diameter pipe for refrigerant 75 (see FIG. 3) can be inserted. The connection pipe 23, the liquid refrigerant thin pipe 65, and the gas refrigerant thin pipe 75 inserted into the insertion portion 22 are fixed to the heat transfer pipe 21 by brazing.

(2-2) Liquid refrigerant indoor refrigerant piping assembly The liquid refrigerant indoor refrigerant piping assembly 60 is an example of an indoor refrigerant piping assembly.

  The liquid refrigerant indoor refrigerant pipe assembly 60 is connected to the liquid refrigerant communication pipe 40. In the liquid refrigerant indoor refrigerant pipe assembly 60, the liquid refrigerant flows from the air conditioner outdoor unit 50 toward the indoor heat exchanger 20 during the cooling operation of the air conditioner 100. Further, the liquid refrigerant flows into the liquid refrigerant indoor refrigerant pipe assembly 60 from the indoor heat exchanger 20 toward the air conditioner outdoor unit 50 during the heating operation of the air conditioner 100.

  The liquid refrigerant indoor refrigerant pipe assembly 60 includes a liquid refrigerant large-diameter pipe 61 and a liquid refrigerant thin-diameter pipe 65 (see FIG. 4). The large-diameter pipe 61 for liquid refrigerant is connected to the connection pipe 40 for liquid refrigerant. The small-diameter pipe 65 for liquid refrigerant is connected to the indoor heat exchanger 20 and communicates the indoor heat exchanger 20 and the large-diameter pipe 61 for liquid refrigerant. The large-diameter pipe 61 for liquid refrigerant is a pipe having an outer diameter of 6.35 mm. The liquid refrigerant small-diameter pipe 65 is a pipe having an outer diameter of 5 mm. The indoor refrigerant piping assembly 60 for liquid refrigerant is mainly composed of a large diameter pipe 61 for liquid refrigerant. The pipe diameter of the liquid refrigerant large-diameter pipe 61 is reduced in the vicinity of the indoor heat exchanger 20 and is connected to the liquid refrigerant small-diameter pipe 65. The liquid refrigerant large-diameter pipe 61 is connected to the liquid refrigerant thin-diameter pipe 65 without branching. The end of the liquid refrigerant small-diameter tube 65 is connected to the heat transfer tube 21 of the indoor heat exchanger 20. The large-diameter pipe 61 for liquid refrigerant and the indoor heat exchanger 20 communicate with each other through a single small-diameter pipe 65 for liquid refrigerant (see FIG. 3).

  The liquid refrigerant large-diameter pipe 61 includes a first part 62, a second part 63, and a third part 64 (see FIG. 2). In the state where the air conditioning indoor unit 10 is viewed from the front, the first portion 62 extends horizontally in the right direction from the connection portion 62a connected to the liquid refrigerant communication pipe 40. The second part 63 extends upward from the right end of the first part 62. The first part 62 and the second part 63 form an angle of 90 °. The third part 64 extends from the upper end of the second part 63 and is connected to the liquid refrigerant small-diameter pipe 65. In the third part 64, when a force is applied to the liquid refrigerant indoor refrigerant pipe assembly 60 when the air conditioning indoor unit 10 is installed, the force applied to the liquid refrigerant small diameter pipe 65 is reduced. A trap 66 is formed (see FIGS. 3 to 6). The trap 66 includes both a first bent portion 66a and a second bent portion 66b (see FIGS. 3 to 6).

  As shown in FIG. 5, the first bent portion 66 a is a first inclined portion that is inclined by an angle θ with respect to the XZ plane Pxz that spreads in a direction perpendicular to the paper surface when the liquid refrigerant indoor refrigerant pipe assembly 60 is viewed from above. It is bent in a U shape (see FIG. 4) on the plane P1. In the first bent portion 66a, the large-diameter pipe 61 for liquid refrigerant extends from the upper end portion of the second portion 63 to the left obliquely upward in an arc shape, then is bent downward, and extends obliquely downward to the left (see FIG. 4). ). In the first bent portion 66a, the liquid refrigerant large-diameter pipe 61 is bent in a U shape so as to be folded back.

  As shown in FIG. 6, the second bent portion 66b is arranged in the vicinity of the first bent portion 66a. More specifically, the second bent portion 66b is arranged on the third portion 64 on the liquid refrigerant small diameter pipe 65 side of the first bent portion 66a so as to be continuous with the first bent portion 66a. As shown in FIG. 5, the second bent portion 66 b is U-shaped on the second plane P <b> 2 that extends in a direction perpendicular to the paper surface when the liquid refrigerant indoor refrigerant pipe assembly 60 is viewed from above (see FIG. 4). ) Is bent. The second plane P2 is the same plane as the YZ plane Pyz. The second plane P2 is a plane that intersects the first plane P1, as shown in FIG.

  The second bent portion 66b extends substantially horizontally forward from the end of the first bent portion 66a on the second bent portion 66b side, then is bent to the back side, and extends obliquely downward rearward (see FIG. 6). . In the second bent portion 66b, the large-diameter pipe 61 for liquid refrigerant is bent in a U shape so as to be folded back.

  An effect of providing the trap 66, that is, both the first bent portion 66a and the second bent portion 66b will be described.

  First, it is assumed that the trap 66 is not provided and only the first bent portion 66a is provided. And when connecting the indoor refrigerant | coolant piping assembly 60 for liquid refrigerants, and the connection piping 40 etc., the indoor refrigerant | coolant indoor piping assembly 60 for liquid refrigerants was pulled, and force acted in the direction along the 1st plane P1. To do. In this case, the force acting on the liquid refrigerant small-diameter tube 65 is reduced by the liquid refrigerant large-diameter tube 61 bent in the U-shape of the first bent portion 66a on the first plane P1. However, if the liquid refrigerant indoor refrigerant pipe assembly 60 is pulled, and a force is applied in a direction orthogonal to the first plane P1, the liquid refrigerant small-diameter pipe formed by the first bent portion 66a is in this direction. The effect of reducing the force acting on 65 cannot be obtained. Therefore, there is a possibility that the liquid refrigerant small-diameter pipe 65 connected to the indoor heat exchanger 20 may be damaged.

  On the other hand, in the air conditioning indoor unit 10, the trap 66 is provided in the liquid refrigerant indoor refrigerant pipe assembly 60, and in addition to the first bent portion 66a, on the second plane P2 that intersects the first plane P1. A bent second bent portion 66b is provided. Therefore, when a force acts in a direction perpendicular to the first plane P1, the force acting on the liquid refrigerant small-diameter pipe 65 is reduced by the second bent portion 66b. Therefore, damage to the liquid refrigerant small-diameter pipe 65 is easily suppressed regardless of the direction of the force acting on the liquid refrigerant indoor refrigerant pipe assembly 60.

(2-3) Gas Refrigerant Indoor Refrigerant Pipe Assembly The gas refrigerant indoor refrigerant pipe assembly 70 is connected to the gas refrigerant communication pipe 40. Gas refrigerant flows through the indoor refrigerant pipe assembly 70 for gas refrigerant from the indoor heat exchanger 20 toward the air conditioner outdoor unit 50 during the cooling operation of the air conditioner 100. In the refrigerant refrigerant assembly 70 for gas refrigerant, gas refrigerant flows from the air conditioner outdoor unit 50 toward the indoor heat exchanger 20 during the heating operation of the air conditioner 100.

  The indoor refrigerant pipe assembly 70 for gas refrigerant is connected to the large diameter pipe 71 for gas refrigerant connected to the communication pipe 40 for gas refrigerant and the indoor heat exchanger 20, and the indoor heat exchanger 20 and the large gas refrigerant pipe are connected. A gas refrigerant small diameter pipe 75 communicating with the diameter pipe 71 (see FIG. 2). The gas refrigerant large-diameter pipe 71 is a pipe having an outer diameter of 9.52 mm, and the gas refrigerant small-diameter pipe 75 is a pipe having an outer diameter of 5 mm. Most of the indoor refrigerant piping assembly 70 for gas refrigerant includes a large diameter pipe 71 for gas refrigerant. The indoor refrigerant piping assembly 70 for gas refrigerant has a flow divider 77 disposed in the vicinity of the indoor heat exchanger 20. The flow divider 77 branches the refrigerant flow path from the large diameter gas pipe 71 for gas refrigerant into three small diameter pipes 75 for gas refrigerant (see FIG. 3). Each of the gas refrigerant thin tubes 75 branched by the flow divider 77 is connected to the heat transfer tube 21 of the indoor heat exchanger 20.

  The gas refrigerant large-diameter pipe 71 includes a first part 72, a second part 73, and a third part 74 (see FIG. 2). In the state where the air conditioning indoor unit 10 is viewed from the front, the first portion 72 extends horizontally in the right direction from the connection portion 72a with the connecting pipe 40 for gas refrigerant. The second portion 73 extends upward from the right end portion of the first portion 72. The first part 72 and the second part 73 form an angle of 90 °. The third portion 74 extends from the upper end portion of the second portion 73 and is connected to the gas refrigerant small-diameter pipe 75 via the flow divider 77. The third portion 74 is provided with a bent portion 76a having the same structure as the first bent portion 66a of the liquid refrigerant indoor refrigerant pipe assembly 60. However, the third bent portion 71 of the gas refrigerant large-diameter pipe 71 does not have the second bent portion like the third portion 64 of the liquid refrigerant indoor refrigerant pipe assembly 60, and the first bent portion and the second bent portion. A trap composed of a bent portion is not formed. That is, the trap 66 is formed only in the liquid refrigerant large-diameter pipe 61 out of the liquid refrigerant large-diameter pipe 61 and the gas refrigerant large-diameter pipe 71.

  Since the indoor refrigerant pipe assembly 70 for gas refrigerant is connected to the indoor heat exchanger 20 by three small diameter pipes 75 for gas refrigerant, each of the small diameter pipes 75 for gas refrigerant can be provided without providing a trap. The force acting on the surface tends to be small. Further, since each gas refrigerant small-diameter pipe 75 extends in different directions as shown in FIG. 3 and is connected to the indoor heat exchanger 20, a force acts on the gas refrigerant indoor refrigerant pipe assembly 70. However, the small-diameter pipe 75 for gas refrigerant is not easily damaged.

(3) Features (3-1)
The air-conditioning indoor unit 10 according to the embodiment is a wall-hanging air-conditioning indoor unit 10 connected to the air-conditioning outdoor unit 50 via a communication pipe 40. The air conditioning indoor unit 10 includes an indoor heat exchanger 20 and a liquid refrigerant indoor refrigerant pipe assembly 60 as an example of an indoor refrigerant pipe assembly. The liquid refrigerant indoor refrigerant pipe assembly 60 includes a liquid refrigerant large-diameter pipe 61 and a liquid refrigerant thin-diameter pipe 65. The liquid refrigerant large-diameter pipe 61 is connected to the communication pipe 40. The small-diameter pipe 65 for liquid refrigerant is connected to the indoor heat exchanger 20 and communicates the indoor heat exchanger 20 and the large-diameter pipe 61 for liquid refrigerant. The large-diameter pipe 61 for liquid refrigerant has a first bent portion 66a that bends in a U shape on the first plane P1, and a second plane P2 that is disposed in the vicinity of the first bent portion 66a and intersects the first plane P1. A trap 66 including a second bent portion 66b that bends in a U shape is formed.

  Here, in the liquid refrigerant large-diameter pipe 61 of the liquid refrigerant indoor refrigerant pipe assembly 60 serving as the inlet / outlet pipe, the first bent portion 66a and the second plane P1 where the first bent portion 66a bends are intersected. A second bent portion 66b that bends on the plane P2. Therefore, when the air-conditioning indoor unit 10 is installed or the like, no matter which direction of force is applied to the liquid refrigerant indoor refrigerant piping assembly 60, the first bent portion 66a and the second bent portion 66b cause the liquid refrigerant. The force acting on the liquid refrigerant small-diameter pipe 65 of the indoor refrigerant pipe assembly 60 for use is easily reduced. As a result, the indoor refrigerant piping assembly 60 for liquid refrigerant is unlikely to be damaged, and operations such as installation of the air conditioning indoor unit 10 are likely to be facilitated.

(3-2)
In the air conditioning indoor unit 10 according to the embodiment, the large-diameter pipe 61 for liquid refrigerant extends from the first part 62 extending in the horizontal direction, the second part 63 extending upward from the first part 62, and the second part 63. And a third portion 64 connected to the liquid refrigerant small-diameter tube 65. The trap 66 is formed in the third portion 64.

  Here, since the trap 66 is formed in the third portion 64 of the liquid refrigerant large-diameter pipe 61 connected to the liquid refrigerant thin-diameter pipe 65, the liquid refrigerant thin refrigerant pipe assembly 60 of the liquid refrigerant thin refrigerant pipe assembly 60 is formed. The force acting on the diameter pipe 65 is easily reduced.

(3-3)
In the air conditioning indoor unit 10 according to the embodiment, the liquid refrigerant large-diameter pipe 61 is connected to the liquid refrigerant communication pipe 40.

  Here, damage to the liquid refrigerant small-diameter pipe 65 of the liquid refrigerant indoor refrigerant pipe assembly 60 can be suppressed.

  In general, the liquid refrigerant indoor refrigerant pipe assembly 60 is often connected to the indoor heat exchanger 20 by a relatively small number of liquid refrigerant small diameter pipes 65. Also in the air conditioning indoor unit 10, the liquid refrigerant indoor refrigerant pipe assembly 60 communicates the liquid refrigerant large-diameter pipe 61 and the indoor heat exchanger 20 with a single liquid refrigerant small-diameter pipe 65.

  When the liquid refrigerant indoor refrigerant pipe assembly 60 is connected to the indoor heat exchanger 20 by a single liquid refrigerant small-diameter pipe 65, the liquid refrigerant small-diameter pipe 65 is likely to be damaged. Here, since the trap 66 is provided in the liquid refrigerant indoor refrigerant pipe assembly 60, it is possible to reduce the force acting on the liquid refrigerant small-diameter pipe 65, and the liquid refrigerant indoor refrigerant pipe assembly 60. Can prevent the occurrence of damage.

(3-4)
The air conditioning indoor unit 10 according to the embodiment further includes an indoor refrigerant piping assembly 70 for gas refrigerant. The gas refrigerant indoor refrigerant piping assembly 70 includes a gas refrigerant large-diameter pipe 71 and a gas refrigerant small-diameter pipe 75. The large-diameter pipe 71 for gas refrigerant is connected to the connecting pipe 40 for gas refrigerant. The small-diameter pipe 75 for gas refrigerant is connected to the indoor heat exchanger 20 and communicates the indoor heat exchanger 20 and the large-diameter pipe 71 for gas refrigerant. Of the large-diameter pipe 61 for liquid refrigerant and the large-diameter pipe 71 for gas refrigerant, the trap 66 is formed only in the large-diameter pipe 61 for liquid refrigerant. The indoor refrigerant piping assembly 70 for gas refrigerant has a flow divider 77 for branching the refrigerant flow path from the large diameter pipe 71 for gas refrigerant to three small diameter pipes 75 for gas refrigerant.

  Here, a trap 66 is provided in the liquid refrigerant indoor refrigerant pipe assembly 60. On the other hand, three small-diameter pipes for gas refrigerant 75 are connected to the indoor heat exchanger 20, and the small-diameter pipe for gas refrigerant 75 is relatively resistant to damage, and the indoor refrigerant pipe assembly 70 for gas refrigerant has a trap. It is not provided. For this reason, about the indoor refrigerant | coolant piping assembly 70 for gas refrigerants, the man-hour of piping processing for providing the trap 66 can be reduced.

(3-5)
In the air conditioning indoor unit 10 according to the above embodiment, the outer diameter of the liquid refrigerant small-diameter pipe 65 is 5 mm.

  Since the outer diameter of the liquid refrigerant thin tube 65 is as thin as 5 mm, the liquid refrigerant thin tube 65 is easily damaged by a relatively small force. Here, by providing the trap 66 in the large-diameter pipe 61 for liquid refrigerant, the damage can be suppressed even for the thin-diameter pipe 65 for liquid refrigerant having an outer diameter of 5 mm. Therefore, according to the diameter reduction of the heat transfer tube 21 of the indoor heat exchanger 20, the outer diameter of the liquid refrigerant small diameter pipe 65 of the liquid refrigerant indoor refrigerant pipe assembly 60 can also be reduced.

(4) Modifications Modifications of the above embodiment are shown below. In addition, a part or all of the configuration of each modification may be combined with a part or all of the configuration of another modification as long as they do not contradict each other.

(4-1) Modification A
In the said embodiment, although the 2nd plane P2 in which the 2nd bending part 66b bends, and the 1st plane P1 in which the 1st bending part 66a bends are not orthogonal, it is not limited to this. As shown in FIG. 7, when the second plane P2 is orthogonal to the first plane P1 ′, the force acting on the liquid refrigerant small-diameter pipe 65 of the liquid refrigerant indoor refrigerant pipe assembly 60 is particularly easily reduced.

  On the other hand, in consideration of space saving of the liquid refrigerant indoor refrigerant piping assembly 60, suppression of pipe resistance in the liquid refrigerant indoor refrigerant piping assembly 60, and the like, the second plane P2 and the first plane P1 are used. And do not have to be orthogonal as in the above embodiment. However, as the second plane P2 and the first plane P1 approach in parallel, the force in the direction orthogonal to the first plane P1 is likely to act on the liquid refrigerant small-diameter pipe 65, so that the second plane P2 The angle with the first plane P1 is preferably as close to 90 ° as possible.

(4-2) Modification B
In the above embodiment, the liquid refrigerant large-diameter pipe 61 and the indoor heat exchanger 20 are communicated with each other by a single liquid refrigerant small-diameter pipe 65, but the present invention is not limited to this. For example, as shown in FIG. 8, the liquid refrigerant indoor refrigerant pipe assembly 60 includes a flow divider 67 that branches the refrigerant flow path from the liquid refrigerant large-diameter pipe 61 to the two liquid refrigerant small-diameter pipes 65. May be. The liquid refrigerant large-diameter pipe 61 and the indoor heat exchanger 20 may be communicated with each other by two liquid refrigerant small-diameter pipes 65.

  When the indoor refrigerant piping assembly 60 for liquid refrigerant is connected to the indoor heat exchanger 20 by two small-diameter pipes 65 for liquid refrigerant, the indoor heat exchanger 20 is connected by the single small-diameter pipe 65 for liquid refrigerant. Damage is more likely to be suppressed than when connected. However, particularly when the outer diameter of the liquid refrigerant small diameter pipe 65 is 5 mm or less, the liquid refrigerant indoor refrigerant pipe assembly 60 is connected to the indoor heat exchanger 20 by the two liquid refrigerant small diameter pipes 65. Even in this case, the liquid refrigerant small-diameter pipe 65 is likely to be damaged. On the other hand, by providing the trap 66 in the liquid refrigerant indoor refrigerant pipe assembly 60, the force acting on the liquid refrigerant small-diameter pipe 65 can be reduced, and damage to the liquid refrigerant indoor refrigerant pipe assembly 60 can be reduced. Generation can be suppressed.

(4-3) Modification C
In the above embodiment, the trap 66 is not provided in the indoor refrigerant piping assembly 70 for gas refrigerant. However, the present invention is not limited to this, and a trap may also be provided in the indoor refrigerant piping assembly 70 for gas refrigerant. In particular, when the gas refrigerant indoor refrigerant pipe assembly 70 is connected to the indoor heat exchanger 20 by two or less small diameter gas refrigerant pipes 75, the gas refrigerant indoor refrigerant pipe assembly 70 is also trapped. It is desirable to be provided.

(4-4) Modification D
In the above embodiment, the outer diameter of the liquid refrigerant small-diameter tube 65 is 5 mm, but the outer diameter is not limited to 5 mm. The outer diameter of the liquid refrigerant small-diameter tube 65 may be larger than 5 mm or smaller than 5 mm. However, the thinner the outer diameter, the easier the liquid refrigerant thin tube 65 is damaged. Therefore, when the outer diameter of the liquid refrigerant thin tube 65 is 5 mm or less, a particularly great effect is likely to be obtained.

(4-5) Modification E
In the above embodiment, the flow divider 77 branches the refrigerant flow path from the gas refrigerant large-diameter pipe 71 to the three gas refrigerant small-diameter pipes 75, but the present invention is not limited to this. Alternatively, the refrigerant flow path may be branched from the gas refrigerant large-diameter pipe 71 to more than three gas refrigerant small-diameter pipes 75. The greater the number of branching gas refrigerant small diameter pipes 75, the smaller the force acting on each gas refrigerant small diameter pipe 75, and the gas refrigerant without providing the trap 66 in the gas refrigerant indoor refrigerant pipe assembly 70. The thin refrigerant pipe 75 is not easily damaged.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a wall-mounted air conditioning indoor unit, and even when a force is applied to an entrance / exit pipe connected to a communication pipe between the air conditioning indoor unit and the air conditioning outdoor unit, the entrance / exit pipe is hardly damaged. Therefore, it is possible to facilitate the operation such as installation, which is useful.

DESCRIPTION OF SYMBOLS 10 Air-conditioning indoor unit 20 Indoor heat exchanger 40 Connection piping 50 Air-conditioning outdoor unit 60 Indoor refrigerant piping assembly for liquid refrigerant (indoor refrigerant piping assembly)
61 Large diameter pipe for liquid refrigerant (large diameter pipe)
62 1st part 63 2nd part 64 3rd part 65 Thin diameter pipe for liquid refrigerant (thin diameter pipe)
66 Trap 66a First bent portion 66b Second bent portion 67 Shunt 70 Gas refrigerant indoor refrigerant piping assembly 71 Gas refrigerant large diameter pipe 75 Gas refrigerant small diameter pipe 77 Shunt

Japanese Patent Laid-Open No. 2004-163018

Claims (8)

A wall-mounted air conditioning indoor unit (10) connected to the air conditioning outdoor unit (50) via a communication pipe (40),
An indoor heat exchanger (20);
An indoor refrigerant having a large diameter pipe (61) connected to the communication pipe and a small diameter pipe (65) connected to the indoor heat exchanger and communicating the indoor heat exchanger and the large diameter pipe. A pipe assembly (60),
The large-diameter pipe includes a first bent portion (66a) that bends in a U-shape on the first plane, and a U-shaped portion that is disposed in the vicinity of the first bent portion and intersects the first plane. A trap (66) including a second bent portion (66b) that bends in a letter shape,
Air conditioning indoor unit (10). The large-diameter pipe includes a first part (62) extending in the horizontal direction, a second part (63) extending upward from the first part, and a second part extending from the second part and connected to the small-diameter pipe. 3 parts (64)
The trap is formed in the third part,
The air conditioning indoor unit according to claim 1. The second plane is orthogonal to the first plane.
The air conditioning indoor unit according to claim 1 or 2. The large diameter pipe is connected to the communication pipe for liquid refrigerant,
The air conditioning indoor unit according to any one of claims 1 to 3. The indoor refrigerant pipe assembly communicates the large-diameter pipe and the indoor heat exchanger with a single small-diameter pipe.
The air conditioning indoor unit according to claim 4. The indoor refrigerant pipe assembly further includes a flow divider (67) for branching a refrigerant flow path from the large diameter pipe to the two small diameter pipes.
The air conditioning indoor unit according to claim 4. A gas refrigerant large-diameter pipe (71) connected to the communication pipe for gas refrigerant, and a gas connected to the indoor heat exchanger and communicating the indoor heat exchanger and the gas refrigerant large-diameter pipe An indoor refrigerant pipe assembly (70) for gas refrigerant having a small-diameter pipe (75) for refrigerant,
Of the large diameter pipe and the large diameter pipe for gas refrigerant, the trap is formed only in the large diameter pipe,
The indoor refrigerant pipe assembly for gas refrigerant further includes a flow divider (77) for branching a refrigerant flow path from the large diameter pipe for gas refrigerant to at least three small diameter pipes for gas refrigerant.
The air conditioning indoor unit according to any one of claims 4 to 6. The outer diameter of the small diameter tube is 5 mm or less,
The air conditioning indoor unit according to any one of claims 1 to 7.

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