JPS5916762Y2 - Separate air conditioner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a separate air conditioner having a dehumidifier function, and is particularly designed to reduce the refrigerant noise of an indoor unit during dehumidification operation.

FIG. 1 is a refrigeration cycle diagram during cooling operation, showing the configuration between an indoor unit and an outdoor unit in a conventional separate air conditioner.

In FIG. 1, A indicates an outdoor unit, and B indicates an indoor unit.

The outdoor unit A is composed of a compressor 1, an outdoor heat exchanger 2, a first capillary tube 3, and a first solenoid valve 4.

In addition, the indoor unit I-B is composed of an indoor heat exchanger 5, an indoor first heat exchanger 6, an indoor second heat exchanger 7, a second capillary tube 8, and a second solenoid valve 9. There is.

The indoor heat exchanger 5 includes a first indoor heat exchanger 6 and a second indoor heat exchanger 7.

The outdoor unit 1-A and the indoor unit 1-B are connected by a unit connecting pipe 10, and this unit connecting pipe 10 is covered with a heat insulating piping cover 11.

Thus, each member of the outdoor unit t-A, the indoor unit)-
A refrigerant circuit is constituted by each member B and the unit connecting pipe 1°.

In this Figure 1, during cooling operation, the outdoor unit)A
At the same time as closing the first solenoid valve 4 in the indoor unit)
The second solenoid valve 9 at H is opened to short-circuit the second capillary tube 8.

By doing so, the refrigerant compressed by the compressor 1 in the outdoor unit A flows in the direction shown by the arrow.

In other words, the outdoor heat exchanger 2 - the first capillary tube 8
- Unit connection piping 10 - Indoor unit 1 - Indoor first heat exchanger 6 in B - Second solenoid valve 9 - Indoor second heat exchanger 7 - Unit connection piping 10 - Outdoor unit 1) Compressor 1 in A A refrigerant circuit circulates the refrigerant to provide well-known cooling.

Further, during dehumidification operation, the refrigerant circuit becomes as shown in FIG. 2, the first solenoid valve 4 opens and the second solenoid valve 9 closes.

As a result, the refrigerant is transferred to the compressor 1 - outdoor heat exchanger 2 - solenoid valve 4 - unit connection piping 10 - indoor first heat exchanger 6 -
It is circulated through the path of the second capillary tube 8 - the indoor second heat exchanger 7 - the unit connection piping 10 - the compressor 1 to perform dehumidification.

That is, the indoor first heat exchanger 6 acts as a condenser, and the refrigerant is depressurized by the second capillary tube 8.
It reaches the indoor second heat exchanger 7, where it evaporates and absorbs heat.

Therefore, indoor air is passed through the second indoor heat exchanger 7 to be cooled and dehumidified at the same time, and then passed through the first indoor exchanger 6 to be returned to room temperature.

The conventional separated air conditioner having such a configuration has the following drawbacks.

That is, during dehumidification operation, when the refrigerant passes through the second capillary tube 8, a sudden pressure change is applied to the refrigerant, especially on the outlet side of the second capillary tube 8, due to a sudden increase in the tube diameter. Abnormal noise occurs.

Since the generating section of this abnormal sound is located inside the indoor unit (B), the abnormal noise may be heard in the living space from the indoor unit, which may cause operational problems.

As a countermeasure against this, in order to suppress sudden pressure changes at the outlet of the second capillary tube 8, the tube diameter is changed in stages and the refrigerant flow is guided to the indoor second heat exchanger 7. The second pipe has the function of a run-up pipe to stabilize the
It was provided between the output part of the capillary tube 8 and the inlet of the indoor heat exchanger 7.

However, this run-up pipe is not very effective unless it is long enough, and if you try to deal with this in indoor unit B, the capacity of indoor unit B will become large, and indoor unit B will be thin. , which was a major obstacle to downsizing.

This invention was developed in consideration of the above points, and it effectively suppresses the refrigerant noise generated from the outlet of the second capillary tube in the indoor unit without increasing the volume of the indoor unit. The purpose is to provide a separate air conditioner that can be improved.

Hereinafter, embodiments of the separated air conditioner of this invention will be described based on the drawings.

FIG. 3 shows the configuration of one embodiment, and shows a refrigerant circuit of a refrigeration cycle.

In FIG. 3, the same parts as in FIGS. 1 and 2 will be described with the same reference numerals.

As is clear from comparing FIG. 3 with FIG. 1, the refrigeration cycle operation is the same as the conventional one, but the constituent piping is different.

First, in the outdoor unit) A, the configuration is exactly the same as in Fig. 1, but in the indoor unit) B, the second capillary tube 8 used during dehumidification operation is placed in the indoor unit) B. It is arranged inside the heat insulating piping cover 11.

And, inside this heat insulating piping cover 11, as in the conventional case,
A pair of unit connection pipes 10 connecting the outdoor unit) A and the indoor unit) B are housed.

The above-mentioned second capillano tube 8 and piping 12 are arranged along this pair of unit connecting piping 10.

This piping 12 serves as a run-up pipe that stabilizes the flow of refrigerant from the outlet side of the second capillary tube 8 to the inlet of the indoor second heat exchanger 7.

This piping 12 is connected in series with the second capillary tube 8, and the piping 12 and the capillary tube 8 are connected to the second solenoid valve 9.
The piping 12 is connected to the unit connecting piping 1.
0, and is exposed to the outside of the indoor unit) B.

With this configuration, when the indoor unit B is installed, most of the second capillary tube 8 and the piping 12 as a run-up pipe are taken out to the outside and installed outside the living space.

Therefore, the indoor unit (H) can be made more compact.

In addition, even if the refrigerant passes through the second capillary tube 8 during dehumidification operation, a run-up tube with a sufficient length is effectively used at the exit of the second capillary tube 8, which is the source of abnormal refrigerant noise. Since the piping 12 is provided, rapid pressure changes of the refrigerant can be suppressed, and abnormal refrigerant noise can be effectively reduced.

In addition, even if sound is generated at the exit of the second capillary tube 8, since the sound source is installed outside the living space, no abnormal sound will be generated in the living space. .

In addition, the piping 12 as a run-up pipe has not only a length, but also a length.
By changing the pipe diameter in stages, changes in the pressure of the refrigerant at the outlet of the second capillary tube 8 can be suppressed more effectively.

As mentioned above, according to the separated air conditioner of this invention,
A second capillary tube located between the indoor first heat exchanger and the indoor second heat exchanger in the indoor unit used during dehumidification operation, and a second indoor heat exchanger from the outlet of the second capillary tube. Connect piping as a run-up pipe up to the inlet of the heat exchanger, run this second capillary tube and the piping along the unit connecting piping that connects the indoor unit and the outdoor unit, and store it inside the heat insulating piping cover. Therefore, the indoor unit can be made more compact and the noise generated from the refrigerant passing through the second capillary tube during dehumidification operation can be effectively suppressed.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram during cooling operation showing the configuration between the indoor unit and outdoor unit in a conventional separation type air conditioner, and Fig. 2 is a refrigeration cycle diagram during dehumidification operation in a conventional separation type air conditioner. FIG. 3 is a refrigeration cycle diagram showing the configuration between the outdoor unit and the indoor unit of an embodiment of the separate air conditioner of this invention. 1...Compressor, 2...Outdoor heat exchanger, 3...
...First capillary tube, 4...First solenoid valve, 6...First indoor heat exchanger, 7...
Second heat exchanger on the inside of the curved chamber, 8... Second capillary tube, 9... Second solenoid valve, 10... Unit connection piping, 11... Curved insulation piping cover, 12...
...Piping, A...Indoor/outdoor unit, B...Indoor unit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The second capillary tube located between the indoor first heat exchanger and the indoor second heat exchanger in the indoor unit used during dehumidification operation is brought out to the outside of the indoor unit to connect the indoor unit and the outdoor unit. The pipe is housed in a heat insulating pipe cover along the unit connecting pipe to be connected, and the pipe diameter of the pipe connected between the outlet of the second capillary tube and the second heat exchanger on the indoor side is changed in stages. A separate air conditioner characterized by: