JPS6226465A - Air conditioner - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heat pump type air conditioner, and particularly to an air conditioner that combines reduction of compressor noise and improvement of defrosting performance.

[Technical background of the invention and its problems]

Conventionally, this type of air conditioner is configured as shown in the refrigeration cycle diagram in FIG. They are connected sequentially and annularly through piping 6 to form a closed refrigeration cycle in which refrigerant is circulated, and the room is heated and cooled by switching the four-way valve 2. That is, when the four-way valve 2 is switched to circulate the refrigerant in the direction of the solid line arrow in the figure, heating operation is performed, and when the refrigerant is not circulated in the direction of the broken line arrow, cooling operation or reverse defrosting operation is performed. This reverse defrosting operation defrosts the frost that has formed on the outdoor heat exchanger 5 by radiating heat from the high temperature refrigerant discharged from the compressor 1 at the outdoor heat exchanger 5.

That is, since this circulates the refrigerant in the same direction as the cooling operation, the driving of the indoor fan of the indoor heat exchanger 3 is stopped during this reverse defrosting operation. However, since the room is still air-conditioned at this time, the room temperature drops, causing discomfort.

Further, in conventional air conditioners, a sound insulating material is wrapped around the outer periphery of the compressor 11 to reduce noise.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an air conditioner that reduces noise and improves defrosting performance.

[Summary of the invention]

The present invention was made by focusing on the heat generation of the compressor,
The feature is that the compressor is housed in a heat storage tank filled with heat storage material.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows a refrigeration cycle according to an embodiment of the present invention, in which a compressor 10, a four-way valve 11, an indoor heat exchanger 12, an expansion valve 13, and an outdoor heat exchanger 14 are connected in order through a refrigerant pipe 15. They are connected in a ring to form a closed refrigeration cycle in which refrigerant is circulated, and a hot gas bypass pipe 16 is attached.

The hot gas bypass piping 16 connects the discharge side of the compressor 10 to
Refrigerant pipe 15 connecting expansion valve 13 and outdoor heat exchanger 14
The high temperature refrigerant discharged from the compressor 10 is guided to the outdoor heat exchanger 14. A bypass solenoid valve 17 and a capillary tube 18 are interposed in the middle of the hot gas bypass pipe 16 from upstream to downstream in the flow direction of the refrigerant.

The compressor 10 is substantially entirely housed in a heat storage tank 20 with fins 19 provided on its outer periphery. fin 19
As shown in FIGS. 1 and 2, rectangular fin pieces 19a are stacked radially and axially in multiple layers around the outer periphery of the compressor 10, and the heat storage tank 20 is filled with paraffin, etc. The heat storage material 21 is filled to store the heat generated by the compression 110. Therefore, the high temperature gaseous refrigerant discharged from the compressor IIO can be heated to an even higher temperature, and the refrigerant returning to the suction side can be heated to promote evaporation.

In addition, in FIG. 2, reference numeral 22 indicates a discharge pipe of the compressor 10, and 23
is the suction pipe.

Next, the operation of this embodiment will be described.

When the air conditioner is operated, the electric motor section (not shown) of the compressor 10 generates heat, and this heat is stored in the heat storage material 21 in the heat storage tank 20 via the outer periphery of the compressor 10 and the fins 19. Ru.

By the way, when frost is detected on the outdoor heat exchanger 14 during heating operation of the air conditioner, the bypass solenoid valve 17 opens based on the detection signal. As a result, the high-temperature gas refrigerant discharged from the compressor 10 is further heated to a high temperature by the heat storage material 21 in the heat storage tank 20 before being discharged from the discharge pipe 22. The gas is divided into a gas bypass pipe 16. The high temperature gaseous refrigerant that has flowed into the hot gas bypass pipe 16 is depressurized by the capillary tube 18 and flows into the outdoor heat exchanger 14 .

On the other hand, the refrigerant that has been diverted to the refrigerant pipe 15 passes through the four-way valve 11, radiates heat in the indoor heat exchanger 12 to heat the room, and is depressurized in the expansion valve 13 before being connected to the hot gas bypass pipe 16. It joins with the high-temperature gaseous refrigerant that has bypassed the indoor heat exchanger 12 at the T section, and flows into the T-outside heat exchanger 14 .

Here, the high temperature gaseous refrigerant radiates heat to defrost the frost and liquefy it. This liquid refrigerant passes through the heat storage tank 20 via the suction pipe 23 and is sucked into the suction side of the compressor [10]. At this point, the heat storage material 21 in the heat storage tank 20 has already risen to a high temperature, so the liquid refrigerant is heated and evaporated as it passes through the heat storage tank 20, becoming gaseous and compressed! 110 is returned to the suction side.

In the above embodiment, the high temperature gaseous refrigerant discharged from the compressor 10 is transferred to the hot gas bypass pipe 16 and the refrigerant pipe 1.
Although the case has been described in which the heating operation and the defrosting operation are performed in parallel by dividing the flow into the air and air flow areas 5 and 5, the driving of the indoor fan (not shown) attached to the indoor heat exchanger 12 may be stopped.

According to this, the loss of heat of the refrigerant flowing in the indoor heat exchanger 12 can be reduced, so that heat can be used for defrosting the outdoor heat exchanger 14, and the defrosting performance can be improved. can be achieved.

In this embodiment, since the compressor 10 is almost entirely surrounded by the liquid heat storage material 21, the noise of the compressor 10 can be avoided by being absorbed by the heat storage material, thereby reducing the noise.

Note that the present invention can also be applied to an air conditioner that employs a defrosting method that does not include the hot gas bypass piping 16. For example, as shown in FIG. 3, the expansion valve 13
It can also be applied to a structure in which bypass piping 30 is connected in parallel.

The bypass pipe 30 has a bypass valve 31 and a capillary tube 32 sequentially interposed in the middle thereof from upstream to downstream in the flow direction of the refrigerant. When the bypass valve 31 is opened, the high-temperature gaseous refrigerant is discharged. Defrosting operation is performed by passing the air through the outdoor heat exchanger 14. According to this, similar to the embodiment shown in FIG. 1, defrosting operation can be performed in parallel with heating operation, and the heat is radiated in the outdoor heat exchanger 14 to defrost the liquefied refrigerant. can be heated and evaporated in the heat storage tank 20.

Furthermore, as shown in FIG. 4, when the capillary tube 32 is omitted from the bypass piping 30, the four-way valve 11
Performs reverse defrosting operation in which the refrigerant is circulated in the direction of the dashed arrow. In other words, the bypass valve 3 is closed during reverse defrosting operation.
1 is opened, heat is radiated and defrosted in the outdoor heat exchanger 14, and the liquefied refrigerant is guided by the bypass valve 31 and flows into the indoor heat exchanger 12 via the bypass pipe 30. Compress it! If there is a liquid component in the refrigerant returned to the suction side of the refrigerant 110, this liquid component can be heated and evaporated by the heat storage material 21 in the heat storage tank 20.

〔Effect of the invention〕

As explained above, the present invention provides an air conditioner in which a compressor, a four-way valve, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, etc. are sequentially connected via refrigerant piping to form a refrigeration cycle. The machine was housed in a heat storage tank filled with heat storage material.

Therefore, according to the present invention, since the outer periphery of the compressor is surrounded by the heat storage material, the noise of the compressor can be absorbed by the heat storage material, thereby reducing the noise.

Further, in the present invention, heat generated during operation of the compressor is stored in the heat storage material in the heat storage tank, so that the high temperature gas refrigerant discharged from the compressor can be heated to an even higher temperature. Therefore, by radiating heat from this high-temperature gaseous refrigerant in the outdoor heat exchanger, the defrosting performance can be improved.

Furthermore, the refrigerant returned to the suction side of the compressor can also be heated as it passes through the heat storage tank, so if the returned refrigerant is liquid or has a liquid component, it can be evaporated by heating. can.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle diagram of an embodiment of the air conditioner according to the present invention, FIG. 2 is a vertical sectional view of a heat storage tank housing the compressor shown in FIG. 1, and FIGS. 3 and 4. 5 is a refrigeration cycle diagram showing other embodiments of the present invention, and FIG. 5 is a refrigeration cycle diagram of a conventional example. DESCRIPTION OF SYMBOLS 10... Compressor, 11... Four-way valve, 12... Indoor heat exchanger, 14... Outdoor heat exchanger, 15... Refrigerant piping, 16... Hora l-gas bypass Piping, 17.
...Bypass solenoid valve, 18.32...Capillary tube, 19...Fin, 19a...Fin piece, 20
... Heat storage tank, 21... Heat storage material.

Claims (1)

[Claims] 1. In an air conditioner in which a refrigeration cycle is formed by sequentially connecting a compressor, a four-way valve, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, etc. with refrigerant piping, the compressor An air conditioner characterized in that the is housed in a heat storage tank filled with a heat storage material. 2. The air conditioner according to claim 1, wherein the compressor has fins on its outer periphery.