JP2004354026A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive air conditioner capable of reducing a refrigerant gas sound and a pipe vibration and improving the workability by reduction in the number of part items by simplifying a structure for a capillary tube and stabilizing the circulation of the refrigerant gas. <P>SOLUTION: This air conditioner comprises an indoor unit and an outdoor unit mutually connected through a gas pipe and a liquid pipe. The outdoor unit comprises a compressor for compressing the refrigerant gas, a four-way valve for switching the supplying destination of the refrigerant gas, a heat exchanger for heat-exchanging the refrigerant gas, and a pressure reducing device for reducing the pressure of the refrigerant gas circulating in a refrigeration cycle, which is constituted by use of an expansion valve and a capillary tube. The pressure reducing device includes a pressure reducing capillary tube part 16 corresponding to the capillary tube, and a conduit having a double-tapered pipe shape in which tapered parts 17 formed at both ends of the capillary tube part so as to extend the diameter of the tube and refrigerant gas circulating dissimilar diameter pipe parts 18 and 19 formed continuously to the taper parts are formed in an integrated manner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat pump type air conditioner including an indoor unit and an outdoor unit, and more particularly to an air conditioner in which a capillary tube and an expansion valve are applied to an outdoor unit as a pressure reducing device.
[0002]
[Prior art]
A refrigeration cycle in a conventional air conditioner has a basic configuration as shown in FIG. 3 as described in Patent Document 1, for example. In this configuration, the indoor unit 1 and the outdoor unit 2 are connected by a liquid pipe 3 and a gas pipe 4. The outdoor unit 2 includes a compressor 5 for compressing the refrigerant gas, a four-way valve 6 for switching the supply destination of the refrigerant gas, a heat exchanger 7 for exchanging heat of the refrigerant gas, and a decompression of the refrigerant gas circulating inside the refrigeration cycle. A decompression device in which an expansion valve 8 and a capillary tube 9 are combined.
[0003]
In the decompression device in which the expansion valve 8 and the capillary tube 9 are combined, the refrigerant gas is reduced to some extent by circulating the refrigerant gas through the capillary tube 9, and the flow rate of the refrigerant gas is controlled mainly by the opening degree of the expansion valve.
[0004]
The decompression device in which the expansion valve 8 and the capillary tube 9 are combined is connected by using refrigerant gas circulation pipes 11a, 11b, 11c, and 11d having different pipe diameters, and each connection part is joined by a brazing part 10. FIG. 4 shows the structure around the capillary tube 9 in detail. The capillary tube 9 is bent into a circular shape. One end thereof is connected to a pipe 11b connected to a pipe 11a drawn from the heat exchanger 7. The other end is connected to a pipe 11c connected to a pipe 11d drawn from the expansion valve 8. The capillary tube 9 and the pipes 11b and 11c are bound and fixed by a resin band 12. Further, the capillary tube 9 and the pipes 11b and 11c are sandwiched between col tapes 13 to cover the outer appearance.
[0005]
[Patent Document 1]
JP-A-6-294551
[Problems to be solved by the invention]
However, in the above-described conventional configuration, there are the following problems in the brazing portion 10 of the capillary tube 9 shown in FIG. 4 and the pipes 11b and 11c connecting both ends thereof.
[0007]
As shown in FIG. 5, a tapered portion 14 is formed at the tip of the pipe 11b (similarly, 11c). Thus, when the tip of the capillary tube 9 is inserted into the pipe 11b and brazed, a gap is generated between the outer peripheral surface of the tip of the capillary tube 9 and the inner wall of the tapered portion 14 of the pipe 11b. For this reason, when the refrigerant gas is circulated, the refrigerant gas stays in the gap, and the flow of the refrigerant gas is disturbed.
[0008]
Further, since the refrigeration cycle having the capillary tubes in front and behind is composed of a plurality of parts connected to the pipes 11b, 11c and 11d, the number of assembly steps such as brazing is large, and the workability is not good.
[0009]
Further, in order to prevent the above-described pipe vibration, a resin band 12 for fixing the capillary tube 9 and the pipes 11b and 11c and a coltape 13 for reducing the refrigerant gas noise from the pipe overlapping portion 15 are added. This has led to an increase in the number of parts and an increase in cost.
[0010]
SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and reduces the refrigerant gas noise and piping vibration by simplifying the configuration of the capillary tube and stabilizing the circulation of the refrigerant gas. Another object of the present invention is to provide an inexpensive air conditioner by improving workability by reducing the number of parts.
[0011]
[Means for Solving the Problems]
The air conditioner of the present invention includes an indoor unit and an outdoor unit connected to each other by a gas pipe and a liquid pipe, wherein the outdoor unit is a compressor that compresses a refrigerant gas, and a four-way valve that switches a supply destination of the refrigerant gas. A heat exchanger for exchanging heat of the refrigerant gas, and a decompression device constituted by using an expansion valve and a capillary tube for decompressing the refrigerant gas circulating in the refrigeration cycle. In order to solve the above-mentioned problems, the decompression device includes a decompression thin tube portion corresponding to the capillary tube, a tapered portion formed at both ends of the decompression thin tube portion so as to increase a pipe diameter, The taper section includes a double-sided tape-pipe-shaped pipe formed integrally with a refrigerant gas circulating pipe having a different diameter for circulating the refrigerant gas.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the air conditioner of the present invention having the above-described structure, a double-sided tapered pipe is formed by integrating a conventional capillary tube and a pipe having a different diameter for circulating refrigerant gas through a tapered portion. This eliminates the need for brazing the ends of the capillary tube and the different diameter pipe. As a result, the circulation of the refrigerant gas becomes smooth, the noise of the refrigerant gas and the vibration of the piping are reduced, and the configuration of the refrigeration cycle can be simplified.
[0013]
Preferably, a tapered portion is provided at the expansion valve side end of the different-diameter pipe portion forming the double-sided tapered pipe line, and the expansion valve is integrally formed.
[0014]
Further, a configuration in which the depressurizing thin tube portions in the tapered pipe line on both sides are linearly arranged may be employed. This further reduces the pipe resistance in the pressure reducing narrow tube portion, smoothes the flow of the refrigerant gas, and can reduce the size of the refrigeration cycle space of the outdoor unit.
[0015]
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0016]
(Embodiment 1)
FIG. 1 is a diagram illustrating a double-sided tape-pipe-shaped conduit constituting a decompression device of an air conditioner according to Embodiment 1. The air conditioner of the present embodiment has the same basic configuration as the conventional example shown in FIG. The difference between the present embodiment and the conventional example is that the capillary tube in the conventional example forms a part of a double-sided tapered pipe as the depressurizing thin tube portion 16 in the present embodiment. That is.
[0017]
The depressurized thin tube portion 16 bent into a circular shape shown in FIG. 1 has the same function as a capillary tube. Taper portions 17 for increasing the diameter are formed at both ends of the depressurizing thin tube portion 16. Continuing with the tapered portion 17, different-diameter piping portions 18 and 19 for circulating refrigerant gas are formed integrally.
[0018]
The different diameter pipe section 19 is connected to the pipe 11a drawn from the heat exchanger 7 shown in FIG. The expansion valve 8 shown in FIG. 3 is connected to the side of the different diameter pipe portion 18. Therefore, a tapered portion 20 is provided in the different diameter pipe portion 18, and a large-diameter connection pipe portion 21 is formed integrally with the tapered portion 20. Therefore, on the side of the different-diameter pipe portion 18, the pipe 11c shown in FIG. 4 and the pipe 11d drawn directly from the expansion valve 8 have a structure formed continuously and integrally.
[0019]
As described above, a double-sided tape-pipe-shaped pipe including the depressurizing narrow tube portion 16, the taper portions 17 at both ends thereof, the different-diameter pipe portions 18, 19, the taper portion 20, and the connection pipe portion 21. Is configured. The length and diameter of the depressurizing capillary 16 can be freely adjusted.
[0020]
According to the structure of the present embodiment, the capillary tube 16 for decompression, the taper portion 17 at both ends thereof, and the different-diameter piping portions 18 and 19 are integrated, so that the conventional capillary tube and both ends thereof are connected. A brazing portion for connecting different diameter pipes is not required. Therefore, no gap is formed between the both ends of the capillary tube and the connecting portion between the different diameter pipes, and the circulation of the refrigerant gas is smooth. As a result, refrigerant gas noise and piping vibration are reduced, and workability is improved and cost is reduced by reducing the number of parts.
[0021]
Even when the tapered portion 20 and the connecting pipe portion 21 are not integrally formed, only the depressurizing narrow tube portion 16, the taper portions 17 at both ends thereof, and the different-diameter pipe portions 18 and 19 are integrally formed. In practice, the above-mentioned effects can be sufficiently obtained.
[0022]
(Embodiment 2)
Fig. 2 shows a double-sided tape-pipe-shaped pipe constituting a decompression device of an air conditioner according to the second embodiment. The air conditioner of the present embodiment has the same basic configuration as that of the conventional example shown in FIG. 3, and similarly to the first embodiment, the capillary tube 9 of the conventional example includes And form a part of a tapered pipe line on both sides.
[0023]
This embodiment is different from the first embodiment in that the depressurizing narrow tube portion 16 of the tapered double-sided pipe is linearly arranged. The taper portions 17 at both ends of the depressurizing thin tube portion 16 and the different-diameter piping portions 18 and 19 are also arranged linearly.
[0024]
According to this configuration, the refrigerant gas flows from the different-diameter pipe section 19 along the tapered section 17 to the depressurizing narrow pipe section 16, and further smoothly circulates along the tapered section 17 to the different-diameter pipe section 18, and has a different diameter. The stagnation and turbulence of the refrigerant gas generated between the pipes can be prevented, and the pipe vibration and the refrigerant gas noise can be reduced. Therefore, it is not necessary to use parts for noise and vibration countermeasures, and cost can be reduced.
[0025]
Further, by adjusting the length of the depressurizing thin tube section 16 and the pipe diameter at the same time, it is possible to perform effective depressurizing control.
[0026]
Further, by integrally forming the expansion pipe and the pipe having a tapered pipe shape on both sides, the refrigeration cycle configuration can be simplified, the number of work steps during assembly can be reduced, and workability can be improved.
[0027]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the air conditioner of this invention, the double-sided taper pipe which formed the capillary tube into the narrow tube for decompression provided with the taper part at both ends, and formed the different diameter piping part for refrigerant gas circulation continuously to the taper part By configuring the pressure reducing device including the shape of the pipeline, the configuration of the refrigeration cycle can be simplified. Thereby, the circulation of the refrigerant gas is stabilized, the refrigerant gas noise and the piping vibration are reduced, and the workability of the assembly is improved by reducing the number of parts, so that an inexpensive air conditioner can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view showing a double-sided tapered pipe forming a pressure reducing device of an air conditioner according to a first embodiment; FIG. 2 is a plan view showing both sides forming a pressure reducing device of an air conditioner according to a second embodiment; FIG. 3 is a plan view of a refrigeration cycle of a conventional air conditioner. FIG. 4 is an enlarged plan view of a pressure reducing device equipped with a capillary tube in a conventional air conditioner. FIG. 5 is a cross-sectional view showing a connecting portion between the capillary tube and the refrigerant gas circulating pipe of different diameter in FIG.
DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 3 Liquid piping 4 Gas piping 5 Compressor 6 Four-way valve 7 Heat exchanger 8 Expansion valve 9 Capillary tube 10 Brazing parts 11a, 11b, 11c, 11d Refrigerant gas circulation piping 12 Band 13 Corte -Step 14 Taper part 15 Pipe overlap part 16 Depressurizing narrow pipe part 17 Taper parts 18 and 19 Different diameter pipe part 20 Taper part 21 Connection pipe part

Claims (3)

An indoor unit and an outdoor unit connected to each other by a gas pipe and a liquid pipe, wherein the outdoor unit includes a compressor that compresses a refrigerant gas, a four-way valve that switches a supply destination of the refrigerant gas, and a heat exchanger that exchanges heat of the refrigerant gas. An air conditioner including an exchanger, a decompression device configured using an expansion valve and a capillary tube for decompressing a refrigerant gas circulating in the refrigeration cycle,
The decompression device is formed continuously with the depressurized thin tube portion corresponding to the capillary tube, a tapered portion formed at both ends of the depressurized thin tube portion so as to increase the diameter of the tube, and the tapered portion. An air conditioner comprising a double-sided tape-pipe-shaped pipe formed integrally with a different-diameter pipe section for circulating refrigerant gas. 2. The air conditioner according to claim 1, wherein a tapered portion is provided at an end on the expansion valve side of the different-diameter pipe portion forming the double-sided tapered pipe line, and the expansion valve is formed integrally. 3. Machine. The air conditioner according to claim 1 or 2, wherein the reduced-pressure narrow tube portion forming the double-sided tape-shaped pipe is linearly arranged.

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