JP2007093084A - Air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioner capable of using non-fluorocarbon refrigerant, and well installable without restricting the installation site of an indoor unit. <P>SOLUTION: In the air-conditioner, a connection pipe 4 for connecting an indoor unit side pipe 14 to an outdoor unit side pipe 15 consists of a first connection pipe 16a and a second connection pipe 16b, a connection means is used for connecting the second connection pipe 16b to the outdoor unit side pipe 15, a connection part 17 between the indoor unit side connection pipe 15 and the first connection pipe 16a exists on the indoor side to form a non-redetachable connection structure, and connection parts 18, 19 between the first connection pipe 16a and the second connection pipe 16b and between the second connection pipe 16b and the outdoor unit side pipe 15 exist on the outdoor side to form a redetachable connection structure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner having an improved refrigerant piping structure.

  In air conditioners equipped with indoor units and outdoor units, the use of natural refrigerants such as hydrocarbon-based refrigerants and carbon dioxide has been studied, but because it is higher pressure or flammable than chlorofluorocarbon refrigerants, It is necessary to prevent the refrigerant from leaking into the room. Therefore, the piping structure of the air conditioner is composed of indoor unit side piping, connection piping, and outdoor unit side piping, but the indoor unit side piping is extended to connect the indoor unit side piping and connection piping outdoors. A flare joint is used to prevent leakage of refrigerant from the joint portion indoors (Patent Document 1).

However, in such a piping structure, the installation location of the indoor unit may be limited due to the piping length of the indoor unit side piping, and because the indoor unit side piping is long, the piping is poor. There is a problem that installation is bad.
JP-A-9-280589

  The present invention has been made in consideration of the above-described circumstances, and can use a natural refrigerant such as a hydrocarbon-based refrigerant or carbon dioxide. The purpose is to provide.

  In order to achieve the above-described object, an air conditioner according to the present invention includes an outdoor unit installed on the outdoor side, an indoor unit installed on the indoor side, and a connection for connecting the indoor unit and the outdoor unit. In the air conditioner having a pipe, the connection pipe connects the indoor unit side pipe extending from the indoor unit, the outdoor unit side pipe extending from the outdoor unit, and the indoor unit side pipe and the outdoor unit side pipe. The connection pipe is composed of a first connection pipe and a second connection pipe, the indoor unit side pipe, the first connection pipe, the first connection pipe, and the second connection. A pipe, the second connection pipe, and the outdoor unit side pipe are respectively connected using connection means, and a connection portion between the indoor unit side connection pipe and the first connection pipe exists indoors, and is re-detached A connection structure that is impossible, and the first connection pipe Serial second connecting pipe, the connecting portion of the second connecting pipe between the outdoor unit side connecting pipe is present outdoors, and re-desorption characterized by forming a connection structure capable.

  According to the air conditioner according to the present invention, it is possible to use a natural refrigerant such as a hydrocarbon-based refrigerant or carbon dioxide, and there is no limitation on the installation location of the indoor unit. it can.

  Hereinafter, an embodiment of an air conditioner according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a conceptual diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a refrigeration cycle diagram thereof.

  As shown in FIG.1 and FIG.2, the air conditioner 1 which concerns on this invention is isolate | separated into the indoor unit 2 arrange | positioned at the indoor side of the wall part 20 which separates indoors and outdoors, and the outdoor unit 3 arrange | positioned at the outdoor side. The indoor unit 2 and the outdoor unit 3 are separate types connected by a connection pipe 4 and have a refrigeration cycle 5. The refrigeration cycle 5 is housed in the indoor unit 2 and includes a cross-flow fan 6. The refrigeration cycle 5 is housed in the indoor heat exchanger 7 and the outdoor unit 3 that act as an evaporator during cooling operation and as a condenser during heating operation. A four-way valve 8 for switching the refrigerant flow, a compressor 9 for compressing refrigerant gas, and a propeller fan 10. An outdoor heat exchanger 11, a capillary tube 12, an electromagnetic that acts as a condenser during cooling operation and an evaporator during heating operation It is formed by sequentially connecting the control valves 13. In addition, the dotted line arrow in a figure shows the flow of the refrigerant | coolant at the time of heating, and a solid line arrow at the time of air_conditionaing | cooling operation.

  Further, the connection pipe 4 is composed of an indoor unit side pipe 14 connected to the indoor unit 2 side, an outdoor unit side pipe 15 connected to the outdoor unit 2 side, and a connection pipe 16 connecting both the pipes 14 and 15. Is done.

  Further, the connection pipe 16 is connected to the indoor unit side pipe 14 side to form two first connection pipes 16a that form a refrigerant reciprocation path, and two outdoor connection side pipes 15 that are connected to the outdoor unit side pipe 15 to form a refrigerant reciprocation path. It consists of two connection piping 16b.

  Here, the 1st connection part 17 which connects the indoor unit side piping 14 and the 1st connection piping 16a is arrange | positioned indoors, In this 1st connection part 17, re-desorption, such as a lock ring, brazing, welding, adhesion | attachment, etc. Is connected by an impossible connection means. On the other hand, the 2nd connection part 18 which connects the 1st connection piping 16a and the 2nd connection piping 16b, and the 3rd connection part 19 which connects the 2nd connection piping 16b and the outdoor unit side connection piping 15 are arranged outdoors, respectively. The second connecting portion 18 and the third connecting portion 19 are connected by a connecting means that can be reattached, such as a flare joint.

  Therefore, in the case of a new installation of the air conditioner 1, the indoor unit side pipe 14 and the first connection pipe 16a are positioned in the room in advance, and are connected by the first connection part 17 that cannot be re-removed. The 2nd connection part 18 and the 3rd connection part 19 which can perform are located in the outdoor, and the 1st connection piping 16a and the 2nd connection piping 16b, the 2nd connection piping 16b, and the outdoor unit side connection piping 15 are connected. Further, when the air conditioner 1 is removed, the first connection pipe 17a and the second connection pipe 16b are removed by the second connection section 18 and the third connection section 19 without being removed by the first connection section 17. Do. Thereby, at the time of re-installation, connection is not performed at the first connection unit 17, but connection at the second connection unit 18 and the third connection unit 19 is performed. When the air conditioner is used, even if the refrigerant leaks from the second connection part 18 and the third connection part 19 where the desorption is performed, it is safe without flowing out into the room. Furthermore, in the case of a new installation, the indoor unit side pipe 14 and the first connection pipe 16a are connected by the first connection pipe 16a, and therefore the indoor unit side pipe 14 can be shortened. And is relatively easy to install.

  Moreover, it is preferable to comprise the indoor unit side piping 14, the 1st connection piping 16a, the 2nd connection piping 16b, and the outdoor unit side piping 15 by the combination of a different pipe diameter. For example, when the diameter of the entire pipe is reduced by configuring the liquid side pipe by a combination of the outdoor unit side pipe 15, the second connection pipe 16 b, the first connection pipe 16 a, and the indoor unit side pipe 14, in order. In comparison, it is possible to avoid a great increase in pressure loss in the connection pipe and to reduce the amount of refrigerant in the connection pipe as compared with the case where the diameter of the entire pipe is increased. As a result, the refrigerant amount in the connection pipe and the pressure loss in the pipe can be adjusted to some extent, and the performance deterioration of the air conditioner can be improved by avoiding the decrease in performance due to the decrease in the refrigerant filling amount.

In addition, this air conditioner has a low global warming potential as a refrigerant compared to chlorofluorocarbon refrigerants, but has a hydrocarbon-based combustible refrigerant typified by flammable propane and isobutane or a global warming potential. For example, CO ₂ having a low operating pressure is used. By using a piping structure such as the main connection pipe described above, leakage to the indoor side can be avoided, and propane and isobutane can be used. In addition, the conventional piping structure has a high risk of refrigerant leakage. The airtightness of the joint portion between the pipe and the connection pipe can be improved, and refrigerant leakage to the indoor side can be avoided, and CO ₂ can be used.

  According to the air conditioner of the present embodiment, the first connection part that connects the indoor unit side pipe and the first connection pipe is connected by connection means that cannot be removed again. There is no desorption, and it is possible to prevent refrigerant leakage on the indoor side due to deterioration of the connection pipe joint due to re-desorption of the indoor unit side pipe and the connection pipe accompanying the relocation of the air conditioner, and By separating the first connection pipe and the second connection pipe from the second connection portions of both pipes, the relocation of the air conditioner becomes relatively easy.

  In addition, when newly installed, the indoor unit side piping can be shortened by placing the first connection part connecting the indoor unit side piping and the first connection pipe indoors, so the piping is good. Thus, installation is relatively easy.

The conceptual diagram of the air conditioner of one Embodiment of this invention. The refrigeration cycle figure of the air conditioner of one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 2 ... Indoor unit, 3 ... Outdoor unit, 4 ... Connection piping, 5 ... Refrigerating cycle, 7 ... Indoor heat exchanger, 9 ... Compressor, 11 ... Outdoor heat exchanger, 14 ... Indoor unit side Piping, 15 ... Outdoor unit side piping, 16 ... Connection piping, 16a ... First connection piping, 16b ... Second connection piping, 17 ... First connection, 18 ... Second connection, 19 ... Third connection, 20 ... the wall.

Claims (3)

In an air conditioner including an outdoor unit installed on the outdoor side, an indoor unit installed on the indoor side, and a connection pipe connecting the indoor unit and the outdoor unit, the connection pipe is connected to the indoor unit. An indoor unit side pipe extending from the outdoor unit, an outdoor unit side pipe extending from the outdoor unit, and a connection pipe connecting the indoor unit side pipe and the outdoor unit side pipe. The connection pipe is a first connection pipe. And the second connection pipe, and the indoor unit side pipe and the first connection pipe, the first connection pipe and the second connection pipe, and the second connection pipe and the outdoor unit side pipe, respectively. And a connection structure between the indoor unit side connection pipe and the first connection pipe exists indoors and cannot be detached again, and the first connection pipe and the second connection pipe are connected to each other. Connecting pipe, the second connecting pipe and the outdoor unit side connecting pipe Air conditioner, wherein a connection part is present outdoors, and provides connection structure reusable desorption. The air conditioner according to claim 1, wherein the indoor unit side piping, the first connection piping, the second connection piping, and the outdoor unit side piping are configured by a combination of different pipe diameters. The air conditioner according to claim 1 or 2, wherein a combustible refrigerant or a high-pressure refrigerant is used as the refrigerant of the air conditioner.

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