JPH09178212A - Piping connection structure of room unit for air conditioning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping connection structure which achieves a remarkable simplification of piping connection work at a site and yet a small working space. SOLUTION: There are arranged a connection pipe 26 extending from a heat exchanger 23 and refrigerant piping in which a room unit side connection end part 5a to be connected to the connection pipe 26 is positioned and mounted on a wall surface W corresponding to a specified installing position of the room unit 2 for air conditioning and the connection end part 25a of a connection pipe 26 in the room unit 2 for air conditioning is linked to the room unit side connection end part 5a of a refrigerant piping 4. A metal plate member fixed on a proper member is provided and the connection end part 25a of the connection pipe 26 is fixed on the metal plate member. This allows the linking of a drain port to a water gathering pipe simply mounting a room unit for air conditioning at a specified position of the wall surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure for an indoor unit for an air conditioner, which is capable of easily connecting the indoor unit for an air conditioner to various pipes in a housing air conditioner system.

[0002]

2. Description of the Related Art As a housing air conditioner system, an outdoor unit equipped with a compressor is installed outdoors, and an indoor unit installed indoors and an outdoor unit are connected by piping. In this type of housing air conditioner system, a refrigerant pipe for the outward path for sending the refrigerant from the outdoor unit to the indoor unit and a refrigerant pipe for the return path for returning the refrigerant from the indoor unit to the outdoor unit are provided with the outdoor unit and the indoor unit. In addition to the need for connection with the indoor unit, in the case of an indoor unit, it is also necessary to connect a drain pipe for draining condensed water adhering to the heat exchanger surface of the indoor unit to the outside.

[0003]

By the way, in the conventional indoor unit, a short inlet / outlet pipe for connecting with these refrigerant pipes extends from the heat exchanger as a connecting pipe outside the main body, and the connecting pipe is a wall. Through, and is connected to a refrigerant pipe outdoors. For this reason, the refrigerant pipe connection work on site is complicated and the time required for the installation of the Akon system is long, and the appearance of the refrigerant pipe connection is not good because it is exposed outdoors. have.

Further, the connection between the connection pipe extending from the indoor unit and the refrigerant pipe is conventionally provided at the tip of the refrigerant pipe in a half union formed at the tip of the connection pipe from the indoor unit. It is done by screwing a flare nut. For this reason, the work of tightening the flare nut with a double spanner is required, not only a special tool is required, but also a wide working space must be secured for that, and this working space is secured depending on the site. In some cases, the connection work became even more difficult, resulting in a situation in which the connection work became even more difficult.

Regarding the connection of the drain pipe, on the other hand, as in the case of the refrigerant pipe, one end of the drain hose is connected to the short drain outlet pipe extending from the indoor unit, and the other end of the drain hose is extended to the outside through the wall. Work is required, and there are problems of complexity of work on site and securing work space.

Therefore, the object of the present invention is to solve the above-mentioned various problems in the prior art, to significantly simplify the pipe connection work in the field, and to reduce the work space. An object is to provide a pipe connection structure for an indoor unit.

[0007]

According to a first aspect of the present invention for solving the above-mentioned problems, a feature is provided between an indoor unit for air conditioning installed on a wall surface in a room and an outdoor unit for air conditioning installed outdoors. In a pipe connection structure of an air conditioning indoor unit for a housing air conditioner system which is connected by a refrigerant pipe, a refrigerant connection pipe extending from a heat exchanger provided in the air conditioning indoor unit, and the air conditioning indoor unit An indoor unit side connection end to be connected to the connection pipe is positioned and attached to the wall surface according to a predetermined installation position, and a refrigerant pipe is attached,
The connection end portion of the connection pipe is connected to the indoor unit side connection end portion of the refrigerant pipe in the air conditioning indoor unit.

In this structure, the indoor unit for air conditioning is attached to a predetermined installation position on the wall surface by hanging or embedding, so that the connecting end of the refrigerant pipe on the indoor unit side is regulated from the rear of the indoor unit for air conditioning to the regular inside thereof. The connection pipe can be easily connected to the required refrigerant pipe in the indoor unit for air conditioning by entering the position. Therefore, the required connection work for connection can be easily performed indoors, and the connection part is hidden inside the indoor unit for air conditioning, which is aesthetically pleasing and clean. Further, since the indoor unit side connection end of the refrigerant pipe is attached to the corresponding position on the wall surface, it is also useful for shortening the assembly time.

A second aspect of the present invention for solving the above-mentioned problem is that an indoor unit for air conditioning installed on a wall surface in a room and an outdoor unit for air conditioning installed outdoors are connected by a refrigerant pipe. In a piping connection structure for an indoor unit for air conditioning for a housing air conditioner system, the connecting pipe for a refrigerant extending from a heat exchanger for the indoor unit, and a metal plate member fixed to an appropriate member, wherein the connection The point is that the connecting end of the tube is fixed to the metal plate member.

In this structure, since the connecting end portion of the connecting pipe extending from the heat exchanger of the indoor unit for air conditioning is firmly fixed by the metal plate member, the connecting end portion of the connecting pipe is fastened to the refrigerant pipe with the flare nut. In the case of connection by means of, the force associated with tightening does not act on the heat exchanger main body, so that pipe connection work for connection can be performed without causing damage to the heat exchanger, which helps improve workability. In addition, since one side is fixed, a double spanner is not required for tightening the flare, so connection work becomes simple and the work space is small. The metal plate member can be fixed to the main body of the air conditioning indoor unit, an appropriate member of the wall body, or the like.

According to a third aspect of the present invention for solving the above-mentioned problems, the air conditioner indoor unit installed on the indoor wall surface and the air conditioner outdoor unit installed outdoors are connected by a refrigerant pipe. In a piping connection structure of an air conditioning indoor unit for a housing air conditioner system, a drain port for dew condensation water fixed to the main body of the air conditioning indoor unit and a predetermined installation position of the air conditioning indoor unit are provided. The drain port is fixed to the wall surface and has a water collecting pipe for receiving the drainage from the drain port and guiding it to the outside, and the drain port is installed by mounting the air conditioning indoor unit at a predetermined installation position on the wall surface. The drain port and the water collecting pipe are connected to each other by facing the inlet end of the water pipe.

According to this structure, the water collecting pipe is fixed to the wall surface, and the position of the inlet end of the water collecting pipe is fixed to the main body of the air conditioning indoor unit when the air conditioning indoor unit is mounted at a predetermined installation position on the wall surface. Since it is positioned in advance so as to face the drain port that is located and to receive the drainage water from the drain port, the assembly of the drain piping system inside the room can be completed simply by mounting the air conditioning indoor unit at a predetermined position on the wall surface. be able to. In addition, in the case of industrialized houses, if a drain hose is installed in advance on the outlet side of the water collection pipe, the assembly work of all drain piping systems will be completed simply by mounting the indoor unit for air conditioning at a predetermined position on the wall surface. It will be.
Therefore, in any case, the working time for the construction of the drain system can be significantly shortened. In addition, heat insulation of the drain hose is not required.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 are views showing a refrigerant pipe connection structure of an air conditioning indoor unit showing an example of the embodiment of the present invention. 1 is a housing air conditioner system as a whole, and the housing air conditioner system 1 includes an air conditioner indoor unit 2 mounted on a wall surface W in a room and an outdoor unit 3 usually installed outdoors. The indoor unit 2 for air conditioning and the outdoor unit 3 are connected by a refrigerant pipe 4. The refrigerant pipe 4 is composed of a forward-direction refrigerant pipe 5 for sending the refrigerant from the outdoor unit 3 to the air conditioning indoor unit 2 and a return-path refrigerant pipe 6 for returning the refrigerant from the air conditioning indoor unit 2 to the outdoor unit 3. One end of the refrigerant pipe 4 is connected to the air conditioning indoor unit 2 as described in detail below, and the other end of the refrigerant pipe 4 is connected to the outdoor unit 3 by a known means.

In the present embodiment, the air conditioning indoor unit 2 is constructed as a so-called wall-hanging type indoor unit which is hooked to the wall surface W by a pair of mounting brackets K1 and K2 fixed to the wall surface W. Referring to FIG. 2, a heat exchanger 23 is fixedly provided in the main body 21 of the air conditioning indoor unit 2 by a known means, and from the heat exchanger 23, a pair of short refrigerant pipes 24 and 25 are provided. The connecting pipe 26 extends, and a thread groove is formed on the outer circumference of each connection end portion, and a nut is attached to the thread groove. In FIG. 2, the connecting portion 25 of the refrigerant pipe 25
Only a and the nut 25b mounted therein are visible.

On the other hand, on the wall surface W, the refrigerant pipe 4 is provided with a metal fitting K3.
Installed by. This installation is performed by connecting the refrigerant pipe 4 to the wall surface W corresponding to the predetermined installation position of the air conditioning indoor unit 2.
The indoor unit side connection end portion 5a of the outward passage refrigerant pipe 5 and the indoor unit side connection end portion 6a of the return passage refrigerant pipe 6 constituting the above are attached so as to be positioned. In the present embodiment, when the air conditioning indoor unit 2 is hung on a predetermined position of the wall surface W, the outward connection refrigerant pipe 5 is connected to the refrigerant pipes 24 and 25 at such positions as to face the tips of the refrigerant pipes 24 and 25. The forward passage refrigerant pipe 5 and the return passage refrigerant pipe 6 are attached so that the indoor unit side connection end portion 6a of the end portion 5a and the return passage refrigerant pipe 6 are located.

Therefore, the air conditioner indoor unit 2 is attached to the mounting bracket K.
In the state where the refrigerant pipes 24 and 25 are installed so as to be hung on the wall surface W by 1, K2, the connection end portions 24a and 25a of the refrigerant pipes 24 and 25 are fixed to the wall surface W in advance and the indoor unit side connection end portion of the outward refrigerant pipe 5 Indoor unit side connection end 6 of the refrigerant pipe 6 for the return path 5a
It faces a. Therefore, using the flare nuts 5b and 6b provided in advance on the indoor unit side connection end 5a and the indoor unit side connection end 6a, the indoor unit side connection end 5a, the connection end 25a, and the indoor unit side connection end are used. Portion 6a and connecting end portion 24a
And can be easily connected.

FIGS. 3 and 4 show another embodiment of the invention of claim 1. This embodiment differs from the embodiments shown in FIGS. 1 and 2 in that the air conditioning indoor unit 2 is of a wall-embedded type. Therefore, the refrigerant pipe 4 is disposed on the inner side surface of the outer wall W1, and the refrigerant pipe 4 can be hidden between the outer wall W1 and the inner wall W2 so as to be invisible from the room. The air conditioning indoor unit 2 has an outer wall W1.
L-shaped metal fitting K on the wooden cross M provided between the inner wall W2 and the inner wall W2.
It is the structure fixed using 4, K5, and K6.

Also in the case of the embodiment shown in FIGS. 3 and 4,
By installing the air conditioning indoor unit 2 at a predetermined position,
The front end portions 24a and 25a of the refrigerant tubes 24 and 25 have outer walls W1.
Since it is opposed to the indoor unit side connection ends 5a and 6a of the forward path refrigerant pipe 5 and the return path refrigerant pipe 6 attached to the refrigerant pipe 4, the refrigerant pipe 4 can be easily connected to the connection pipe 26 in the main body of the air conditioning indoor unit 2. Can be connected to.

In the configuration shown in FIGS. 1 to 4, the indoor unit for air conditioning is attached to a predetermined installation position on the wall surface by hooking or embedding so that the connecting end of the refrigerant pipe on the indoor unit side is the indoor unit for air conditioning. The connection pipe can be easily connected to a required refrigerant pipe in the air conditioning indoor unit by entering the regular position inside the rear portion. Therefore, the required connection work for connection can be easily performed indoors, and the connection part is hidden inside the indoor unit for air conditioning, which is aesthetically pleasing and clean. Further, since the indoor unit side connection end of the refrigerant pipe is attached to the corresponding position on the wall surface, it is also useful for shortening the assembly time.

FIG. 5 shows a piping connection structure of an air conditioning indoor unit showing an embodiment of the invention of claim 2. In the air conditioning indoor unit 30 shown in FIG. 5, a heat exchanger 32 is fixed to the main body 31 of the body 31 by an appropriate known means, and a blower 33 is provided below the heat exchanger 32. From the heat exchanger 32, a pair of short refrigerant tubes 34, 35
A connecting pipe 36 consisting of The refrigerant pipe 34 is used as an inlet pipe for sending the refrigerant from the air conditioning outdoor unit (not shown) to the heat exchanger 32, while the refrigerant pipe 35 is
It is used as an outlet pipe for returning the refrigerant from the heat exchanger 32 to the outdoor unit for air conditioning. The respective connection ends 34a, 35a of the refrigerant pipes 34, 35 are screwed by nuts 34b, 35b to a mounting plate 37 having a metallic rigidity fixed to the main body 31 by an appropriate means such as screwing. Is fixed and each of the connection ends 34 of the refrigerant pipes 34, 35 is fixed.
The a and 35a are exposed to the outside of the main body 31. It should be noted that thread grooves are formed on the outer circumferences of the connection end portions 34a and 35a, as in the case of the previous embodiment.

According to this structure, it is possible to extremely easily connect the air conditioner indoor unit 30 with the refrigerant pipe 40 for circulating the refrigerant between the air conditioner indoor unit 30 and the air conditioner outdoor unit (not shown). . That is, the connecting end portion 41 a of the outward-direction refrigerant pipe 41 that constitutes the refrigerant pipe 40 has the flare nut 41 b provided therein and the connecting end portion 3 of the refrigerant pipe 34.
By screwing into the thread groove of 4a, it is possible to tighten and connect without a double spanner. Further, the connection end portion 42a of the refrigerant pipe 42 for the return path which constitutes the refrigerant pipe 40 is provided with the flare nut 42b provided therein.
By screwing into the thread groove of the connection end portion 35a, it is possible to tighten and connect without a double spanner. In this case, the connection ends 34a and 35a of the refrigerant pipes 34 and 35, respectively.
Is firmly fixed to the mounting plate 37, so that the refrigerant pipes 34 and 35 do not move during the work of connecting the outward passage refrigerant pipe 41 and the return passage refrigerant pipe 42 thereto, so that it is possible to perform the pipe connection work. It does not damage the heat exchanger 32.

FIG. 6 is a diagram showing another embodiment of the invention of claim 2. In FIG. In the configuration shown in FIG. 6, the mounting plate 37 is not fixed to the main body 31 but is fixed to the wooden crosspiece M near the air conditioning indoor unit 30 with the wooden screws 37a and 37b, and is thus fixed to the wooden crosspiece M. The mounting plate 37 has a refrigerant pipe 35 and a connection pipe 36.
5 is different from the case of FIG. 5 in that the respective connection end portions 35a, 36a are fixed by screwing. The embodiment shown in FIG. 6 is effective when there is no space for mounting the mounting plate 37 in the main body 31.

FIG. 7 is a diagram showing still another embodiment of the invention of claim 2. In FIG. In this embodiment, the wall body WB
The long-term refrigerant pipes 44 and 45 are provided in the air conditioning indoor unit 30 attached to the indoor side of the
Mounting plate 37 in which a and 45a are firmly provided on the outside of the wall body WB
The refrigerant pipes 41 and 42 that are fixed to the air conditioner outdoor unit 46 by fixing the nuts 44b and 45b to the refrigerant pipes 41 and 42 by the flare nuts 41b and 42b. It is intended to connect to.

As described above, according to the configurations of FIGS. 5 to 7, the connection end of the connection pipe extending from the heat exchanger of the air conditioning indoor unit is firmly fixed by the mounting plate having rigidity such as metal. Therefore, when connecting the connecting end of the connecting pipe to the refrigerant pipe by tightening the flare nut, the force due to the tightening does not act on the heat exchanger body, so the pipe for connecting without causing damage to the heat exchanger. Connection work can be performed, which helps improve workability. In addition, since one side is fixed, a double spanner is not required for tightening the flare, so connection work becomes simple and the work space is small. The mounting plate 37 does not necessarily have to be mounted on the main body 31 of the air conditioning indoor unit 30, but can be fixed to an appropriate member such as a machine rail or a wall.

FIG. 8 is a diagram showing a drain pipe connection structure of an air conditioning indoor unit showing an example of an embodiment of the invention of claim 3. The air conditioning indoor unit 50 is provided with a drain port 52 on a bottom surface 51 a of a main body 51 thereof. The drain port 52 is the main body 5
It is for discharging the dew condensation water, which is formed by the moisture in the air adhering to the heat exchanger (not shown) provided inside 1, to the outside of the main body 51, and in this embodiment, it protrudes from the bottom surface 51a. It is formed in the shape of a pipe extending downward. 9 is a perspective view showing the appearance of the air conditioning indoor unit 50 shown in FIG. 8, and it can be seen that the drain port 52 extends downward from the lower portion of the main body 51 of the air conditioning indoor unit 50.

The air conditioning indoor unit 50 is of a wall-mounted type, and has a hook 53 fixed to the back surface 51b of the main body 51.
A and 53b are mounting brackets K fixed to the wall surface W in the room
7 by hanging it on the wall surface W
Can be positioned and attached at a predetermined position.
FIG. 8B shows a state in which the air conditioning indoor unit 50 is correctly hooked at a predetermined position on the wall surface W.

In the state of FIG. 8B, a water collecting member 60 is attached to the wall body WB so that the drainage from the drain port 52 of the air conditioning indoor unit 50 is guided to the outside. The water collecting member 60 is fixed to the wall surface W corresponding to a predetermined installation position of the air conditioning indoor unit 50, and when the air conditioning indoor unit 50 is locked at a predetermined position of the wall surface W, the drain port 52 is provided.
The closing portion 52a of the above is configured to enter into the water collecting port 60a of the water collecting member 60.

The drainage port 60b of the water collecting member 60 is previously attached to the wall body WB so as to be exposed to the outside of the wall body WB, and the water collecting port 60a and the drainage port 60b are formed in the water collecting member 60. The passages 60c communicate with each other. Therefore, in the state of FIG. 8B, when the dew condensation water generated in the air conditioning indoor unit 50 is discharged from the drain port 52, the dew condensation water enters the water collecting port 60a and the passage inside the water collecting member 60. It is discharged from the drainage port 60b through 60c, and the drainage port 60
A drain hose 61 connected to b leads to an outdoor drainage channel (not shown). That is, the water collecting member 60 shown in the present embodiment is configured as a water collecting pipe for receiving the drainage from the drain port 52 and guiding it to the outside.

According to this structure, the water collecting member 60 is fixed to the wall surface, and the position of the water collecting port 60a, which is the inlet end, is
When the indoor unit for air conditioning is installed at a predetermined installation position on the wall surface, it is prepositioned so as to face the drain port 52 fixed to the main body 51 of the indoor unit 50 for air conditioning and receive the drainage from the drain port 52. Therefore, the assembly of the drain piping system on the indoor side can be completed only by attaching the air conditioning indoor unit 50 to a predetermined position on the wall surface. In the case of an industrialized house, if the drain hose 61 is attached to the outlet side of the water collecting member 60 in advance, the air conditioning indoor unit 50 can be attached to a predetermined position on the wall surface to assemble all the drain piping systems. The work will be completed. Therefore, in any case, the working time for the construction of the drain system can be significantly shortened. In addition, heat insulation of the drain hose is not required.

FIG. 10 shows another embodiment of the invention of claim 3. In the embodiment shown in FIG. 10, the air-conditioning indoor unit 50 is of an embedded type, and the L-shaped metal fittings K8 to K10 (see FIG. 11) fixed to the main body 51 thereof are embedded in the wall. Can be installed. Then, the water collecting member 60 is attached to the inner surface of the outer wall W3 in the same manner as shown in FIG. 8, and the water collecting member 60 is located at the back of the inner wall W4 so as to be invisible or difficult to see from the room. be able to. Since other configurations are the same as those of the embodiment shown in FIG. 8, the same parts as those in FIG. 8 are denoted by the same reference numerals in FIG. 10 and their description is omitted.

Also in the case of the embodiment shown in FIG. 10, the assembly of the drain piping system on the indoor side can be completed only by embedding and mounting the air conditioning indoor unit 50 at a predetermined position.

[0033]

According to the first aspect of the present invention, the indoor unit for air conditioning is attached to a predetermined installation position on the wall surface by hanging or embedding so that the connecting end portion of the refrigerant pipe on the indoor unit side becomes the indoor unit for air conditioning. The connection pipe can be easily connected to a required refrigerant pipe in the air conditioning indoor unit by entering the regular position inside the rear portion. Therefore, the required connection work for connection can be easily performed indoors, and the connection part is hidden inside the indoor unit for air conditioning, which is aesthetically pleasing and clean. Further, since the indoor unit side connection end of the refrigerant pipe is attached to the corresponding position on the wall surface, it is also useful for shortening the assembly time.

According to the second aspect of the present invention, since the connecting end portion of the connecting pipe extending from the heat exchanger of the indoor unit for air conditioning is firmly fixed by the metal plate member, the connecting end portion of the connecting pipe is used as the refrigerant pipe. When the flare nut is connected by tightening, the force due to the tightening does not act on the heat exchanger body, so that the pipe connecting work for the connection can be performed without causing damage to the heat exchanger, which is useful for improving workability. In addition, since one side is fixed, a double spanner is not required for tightening the flare, so connection work becomes simple and the work space is small.

According to the third aspect of the present invention, the water collecting pipe is fixed to the wall surface, and the inlet end of the water collecting pipe is attached to the main body of the air conditioning indoor unit when the air conditioning indoor unit is mounted at a predetermined installation position on the wall surface. Since it is prepositioned so as to face the fixed drain port and to receive the drainage water from the drain port, it is possible to assemble the drain piping system on the indoor side simply by mounting the indoor unit for air conditioning at a predetermined position on the wall surface. Can be completed. In addition, in the case of industrialized houses, if a drain hose is installed in advance on the outlet side of the water collection pipe, the assembly work of all drain piping systems will be completed simply by mounting the indoor unit for air conditioning at a predetermined position on the wall surface. It will be. Therefore, in any case, the working time for the construction of the drain system can be significantly shortened. In addition, heat insulation of the drain hose is not required.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the invention of claim 1. FIG.

FIG. 2 is a cross-sectional view showing a refrigerant pipe connection portion of the air conditioning indoor unit shown in FIG.

FIG. 3 is an exploded perspective view showing another embodiment of the invention of claim 1.

FIG. 4 is a cross-sectional view showing a refrigerant pipe connection portion of the indoor unit for air conditioning shown in FIG.

FIG. 5 is a sectional view showing an embodiment of the invention of claim 2;

FIG. 6 is a sectional view showing another embodiment of the invention of claim 2;

FIG. 7 is a sectional view showing still another embodiment of the invention of claim 2;

FIG. 8A is a partially sectional side view showing a state before the indoor unit for air conditioning showing the embodiment of the invention of claim 3 is attached to a wall, and FIG. 8B is the embodiment of the invention of claim 3; The side view which carried out the partial cross section which shows the state after attaching the indoor unit for air conditioning which shows this form to the wall.

9 is a perspective view showing the appearance of the indoor unit for air conditioning shown in FIG.

FIG. 10 (a) is a partially sectional side view showing a state before the indoor unit for air conditioning showing another embodiment of the invention of claim 3 is attached to a wall, and FIG. 10 (b) is the invention of claim 3 FIG. 3 is a side view with a partial cross section showing a state after the indoor unit for air conditioning showing the embodiment of FIG.

11 is a perspective view showing the appearance of the air conditioning indoor unit shown in FIG.

[Explanation of symbols]

 1 Housing Air Conditioner System 2, 30, 50 Air Conditioning Indoor Unit 3 Outdoor Unit 4, 40 Refrigerant Pipe 5, 41 Forward Refrigerant Pipe 6, 42 Return Pass Refrigerant Pipe W Wall 21, 31, 51 Main Body 23, 32 Heat Exchanger 24, 25, 34, 35 Refrigerant pipe 26, 36 Connection pipe 24a, 25a, 34a, 35a Connection end W2 Inner wall W1 Outer wall 37 Mounting plate 52 Drain port 60 Water collecting member 60a Water collecting port WB Wall body

Claims (3)

[Claims] 1. A piping connection of an air conditioning indoor unit for a housing air conditioning system, wherein a refrigerant pipe is connected between an indoor unit for air conditioning installed on a wall surface in the room and an outdoor unit for air conditioning installed outdoors. In the structure, a connection pipe for a refrigerant extending from a heat exchanger provided in the air conditioning indoor unit, and an indoor unit to be connected to the connection pipe on the wall surface corresponding to a predetermined installation position of the air conditioning indoor unit A side connection end is positioned and attached to the refrigerant pipe, and the connection end of the connection pipe in the air conditioning indoor unit is connected to the indoor unit side connection end of the refrigerant pipe. Characteristic air conditioner indoor unit piping connection structure. 2. A piping connection of an air conditioning indoor unit for a housing air conditioning system in which a refrigerant pipe is connected between an indoor unit for air conditioning installed on the wall surface of the room and an outdoor unit for air conditioning installed outdoors. In the structure, a refrigerant connection pipe extending from the indoor unit heat exchanger, and a metal plate member fixed to an appropriate member, the connection end portion of the connection pipe is fixed to the metal plate member A piping connection structure for an air conditioning indoor unit. 3. A piping connection of an air conditioning indoor unit for a housing air conditioning system in which a refrigerant pipe is connected between an air conditioning indoor unit installed on the wall surface of the room and an outdoor air conditioning unit installed outdoors. In the structure, a drain port for dew condensation water drainage fixed to the main body of the air conditioning indoor unit and a drain port fixed to the wall surface corresponding to a predetermined installation position of the air conditioning indoor unit to receive drainage from the drain port. A drainage pipe for guiding outdoors, the drainage port and the drainage port by the indoor unit for air conditioning being installed at a predetermined installation position on the wall surface so that the drain port faces the inlet end of the water collection pipe. A pipe connection structure for an air conditioning indoor unit, characterized in that the water collection pipe is connected.