JPS6346352A - Air conditioner - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an air conditioner, and particularly to a separate air conditioner.

[Conventional technology]

In the conventional apparatus, as described in Utility Model Application Publication No. 48-46452, two connecting pipes are used, and the two connecting pipes are brought together and wrapped with a heat insulating material.

[Problem that the invention seeks to solve]

When installing the above-mentioned conventional device on the wall of a building, the two connecting pipes are combined into one, so the two connecting pipes must be bent together, which requires a large amount of force. However, the installation workability could not be said to be good.

An object of the present invention is to provide an air conditioner with good installation workability of connection piping that connects an outdoor unit and an indoor unit.

[Means for solving problems]

The above object is achieved by providing the outdoor unit of the separate air conditioner with a throttling mechanism such as an expansion valve, and by making the connecting pipe a double pipe.

[Effect]

By providing the outdoor unit with an expansion valve, the refrigerant pressure in the two connecting pipes connecting the outdoor unit and the indoor unit becomes almost equal. Since the refrigerant pressure in the two connecting pipes is almost equal, the outer diameter of one pipe can be made thinner, and the outer diameter and inner diameter of the other pipe can be reduced to a minimum. Even if the pipe is not large in size, it is possible to use a double-pipe connection piping in which the thin-walled pipe is built into the other pipe. By using such a double-pipe connection piping, installation This makes pipe bending work easier.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows
1 is a refrigeration cycle system diagram of an air conditioner implementing the present invention.

In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is an expansion valve or capillary tube, and more recently, a throttle section where electric expansion is used. In addition, the outdoor unit includes a service valve 6 (coupling), a blower (not shown), and the like. On the other hand, 5 is an indoor heat exchanger, which forms an indoor unit together with a service valve 7, a blower (not shown), and the like. Moreover, 8.9 is a connection pipe that connects the outdoor unit and the indoor unit.

FIG. 2 is a sectional view showing a double pipe as a specific example of the connecting pipe. 10 is an outer pipe, and 11 is an inner pipe forming a double pipe connection pipe. Further, 12 is fixed at a portion A at the outlet portion by brazing or adhesive. Further, the inner tube 11 and the outlet portion 12 are fixed together with an adhesive or the like.

In Fig. 1, since there is no refrigerant throttling device between the four-way valve 2, the connection pipe 8, the indoor heat exchanger 5, the connection pipe 9, and the expansion valve 4, the connection pipe 8 and the connection pipe 9 are basically have the same pressure. Therefore, in the present invention, the two connecting pipes are double pipes consisting of an inner pipe 11 and an outer pipe 10. This means that even if an extremely thin steel pipe is used for the inner pipe 11,
Since the pressure inside the outer tube 10 and the pressure inside the inner tube 11 are the same, the inner tube 11 will not expand due to the pressure inside the inner tube 11.
Furthermore, the inner tube 11 is protected by the outer tube 10 and will not be deformed by external force. Therefore, even if the inner diameter of the inner tube 11 is the same,
Since the outer diameter can be made thinner by the thinner wall thickness, it is possible to provide double-pipe connection piping without increasing the outer diameter without increasing the internal resistance of the outer tube. .

in this way.

Since it is possible to use double pipes to form a single connecting pipe and to reduce the thickness of the inner pipe, it does not require much force to bend the connecting pipe during installation, making installation work easier.

In the past, synthetic resin pipes and rubber pipes could not be used as connecting pipes due to the slight leakage caused by the material, but according to the present invention, the pressure in the inner pipe and outer pipe is the same, and Even if a small amount of leakage occurs from the inner tube to the outer tube, it will not leak outside the machine, so the performance of the air conditioner will be maintained.

Furthermore, in the present invention, it is desirable that the connecting pipe 8 in FIG. 1 be an outer pipe and the connecting pipe 9 be an inner pipe. This is because the connecting pipe 9 for both cooling and heating is a liquid flow, so the required pipe cross-sectional area is small.

〔Effect of the invention〕

According to the present invention, since the two connecting pipes are made into one double pipe, the bending work of the pipes can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle system diagram of an air conditioner to which the present invention is applied, and FIG. 2 is a sectional view of connecting piping. 1... Compressor, 2... Four-way valve, 3... Outdoor heat exchanger. 4... Expansion valve, 5... Indoor heat exchanger, 6.7...
Service pulp, 8, 9...Connecting pipe, 10...Outer pipe, 12...Outlet portion, 11...Inner pipe. (、゛

Claims (1)

[Claims] 1. An outdoor unit with a built-in compressor, an outdoor heat exchanger, and a throttle mechanism, and an indoor unit with a built-in indoor heat exchanger, and an outer tube and an inner tube are connected between the outdoor unit and the indoor unit. An air conditioner connected by a double-pipe connection piping consisting of pipes.