JPH0331630A - Heat pump type 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 Field of Industrial Application The present invention relates to a heat pump type air conditioner that utilizes heat storage.

Conventional technology Conventionally, most defrosting methods for outdoor heat exchangers in air source heat pump air conditioners have been to switch a four-way valve to create a cooling cycle, with the outdoor heat exchanger serving as a condenser and the indoor heat exchanger serving as an evaporator. At this time, the indoor fan was stopped to prevent cold drafts. In this method,
Basically, the amount of refrigerant circulating during the refrigeration cycle is small, and the amount of refrigerant circulating during the electric refrigeration cycle of the compressor is small, so it is not possible to expect an increase in the electrical input to the compressor. The indoor fan stops for several minutes during frost, resulting in a lack of heating sensation and loss of comfort.Furthermore, after the defrosting operation is complete, the four-way valve is switched to return to heating operation, and the indoor heat exchanger is turned off. Users were not satisfied with the fact that it took a long time for the temperature to rise.

In recent years, instead of the reverse cycle defrosting system which has such drawbacks, a heat storage tank filled with heat storage material has been installed around the compressor, and compressor waste heat is stored in this heat storage tank during heating, and this heat is used during defrosting. Defrosting methods have been proposed (for example, in JP-A No. 6
3-169457).

The conventional heat pump air conditioner will be described below with reference to the drawings.

FIG. 4 is a refrigeration cycle diagram in a conventional heat pump type air conditioner.

In the figure, l is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a capillary tube, and 5 is an outdoor heat exchanger. Further, 6 is a bypass circuit that bypasses the capillary tube 4, and this bypass circuit 6 is equipped with a two-way valve 7, a check valve 8, and a heat exchanger 9. Further, IO is a heat storage tank, which is disposed around the compressor 1 in contact with it so as to be able to exchange heat, and has a latent heat storage material (Na
CH.

C00.3HgO) 11 is filled, and the heat exchanger 9 is disposed so as to be able to exchange heat with this heat storage material 11. Further, it is further surrounded by a heat insulating material 12. In this refrigeration cycle, the two-way valve 7 is closed during heating operation, and the refrigerant discharged from the compressor 1 is
It flows through the four-way valve 2, the indoor heat exchanger 3, the capillary tube 4, the outdoor heat exchanger 5, and the four-way valve 2, and 1g of it is sucked into the compressor. At this time, with the above-described structure, it is possible to store heat, which was conventionally radiated from the compressor 1 to the outside air, in the heat storage tank IO.

Next, the two-way valve 7 is opened during defrosting operation. This results in
The refrigerant discharged from the compressor 1 flows to the four-way valve 2 and the indoor heat exchanger 3. After being used for heating, a small amount of the refrigerant flows through the capillary tube 4 to the outdoor heat exchanger 5, and the remaining Most of the refrigerant flows into the bypass circuit 6 and the two-way valve 7
The refrigerant flows through the heat exchanger 9 to remove heat from the heat storage material 11, passes through the check valve 8, merges with the refrigerant that has passed through the capillary tube 4, and flows to the outdoor heat exchanger 5. Here, the refrigerant defrosts using the heat it has, and then passes through the four-way valve 2 and is sucked into the compressor 1.

In this way, the heat that was conventionally radiated to the outside air from the pressure mm can be recovered and used for defrosting, increasing energy efficiency and defrosting while maintaining high heating capacity. .

Problems to be Solved by the Invention However, the above-mentioned conventional heat pump type air conditioner had the following problems.

That is, in severe winters when the outside temperature is low or in areas with heavy snowfall, the amount of frost increases, resulting in an increase in the number of times defrosting is required and a longer defrosting time. In such a case, the amount of heat stored in the heat storage tank will be completely used up, and the next time the heat is stored,
There were problems in that heat could not be completely stored, resulting in a decrease in defrosting ability and a longer defrosting time.

The present invention addresses the above-mentioned problems, and aims to store heat in a heat storage tank in a short time using a simple configuration refrigeration cycle that utilizes heat storage so that defrosting can be completed in a short time. There is.

Means for Solving the Problems In order to solve the above problems, the heat pump type air conditioner of the present invention connects a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc. to form a refrigerant circuit. A heat storage tank filled with a heat storage material is arranged around the compressor to exchange heat with the compressor, and a heat exchanger for exchanging heat with the heat storage material is arranged inside the heat storage tank. and providing a bypass circuit having one end connected to the discharge piping from the discharge side of the compressor to the four-way valve and the other end connected to the four-way valve side of the discharge piping,
The refrigerant flow path of the bypass circuit is provided with flow path control means for opening and closing the refrigerant flow path, and the bypass circuit and the heat storage tank are connected in a heat exchange manner.

action The present invention has the following effects through the above means.

That is, a heat storage tank filled with a heat storage material inside is arranged around the compressor for heat exchange with the compressor, one end is connected to the discharge pipe leading from the discharge side of the compressor to the four-way valve, and the other end is connected to the discharge pipe leading from the discharge side of the compressor to the four-way valve. By providing a bypass circuit connected to the four-way valve side of the discharge piping and connecting the bypass circuit and the heat storage tank for heat exchange, heat can be stored in the heat storage tank in a short time, increasing the defrosting ability. can.

Embodiment Hereinafter, FIGS. 1 to 2 of the accompanying drawings showing an embodiment of the present invention will be described.
The explanation will be explained with reference to the figure. In explaining this embodiment, parts having the same functions as the conventional one shown in FIG. 4 are given the same numbers and their explanation will be omitted.

FIG. 1 is a refrigeration cycle diagram of a heat pump air conditioner according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the area around the compressor l shown in FIG. 1.

In the figure, 13 is a second bypass circuit of the discharge pipe 15 extending from the discharge side to the four-way valve 2, and this second bypass circuit 13 is equipped with a second two-way valve 14, and is arranged inside the heat storage tank IO. The flow path of the heat exchanger 9 to be installed is divided into two parts, and the refrigerant flows through a part of the heat exchanger 9.
It is arranged so as to be able to exchange heat with the heat storage material 11.

In the above configuration, during heating operation, the second two-way valve 14 is opened, and one side of the refrigerant discharged from the compressor l flows to the four-way valve 2 through the discharge pipe 15. And other refrigerants are
It flows into the second bypass circuit 13 , passes through the second two-way valve 14 , flows to a part of the heat exchanger 9 disposed inside the heat storage tank 10 , gives heat to the heat storage material 11 , and connects the pipe 15 . It merges with the refrigerant that has passed and flows to the four-way valve 2. Further, in the first bypass circuit 6, the two-way valve 7 is closed to prevent refrigerant from flowing, as in the conventional example.

During defrosting operation, the second two-way valve 14 is closed, and the two-way valve 7 is opened as in the conventional example, and the refrigerant flows through the first bypass, flows to a part of the heat exchanger 9 inside the heat storage tank 10, and stores heat. The refrigerant absorbs heat from the material 11, passes through the check valve 8, joins with the refrigerant that has passed through the pressure reducer 4, and flows to the outdoor heat exchanger 5. After being used for defrosting, the air passes through the four-way valve 2 and is sucked into the compressor 1.

In this way, the heat that was conventionally radiated from the compressor l to the outside air and the discharge pipe 15 are bypassed, and the heat is transferred to the second bypass circuit 13.
By recovering heat from the high-temperature refrigerant heat at the same time, heat can be stored in the heat storage tank 10 in a short time, and a sufficient amount of heat required for defrosting can be secured.

Further, FIG. 3 will be described as another embodiment of the present invention.

In the same figure, similarly to the first embodiment in FIG. 1, when storing heat in the heat storage tank 10, the four-way valve 2 is
A second bypass circuit is provided in the discharge pipe 15 leading to the heat storage tank 10 , and the second bypass circuit 13 is equipped with a second two-way valve 14 . The refrigerant is divided into parts, and the refrigerant flows through a portion of the heat exchanger 9, and the heat exchanger 9 is arranged so as to be able to exchange heat with the heat storage material 11.

Further, reference numeral 16 has one end connected to a pipe leading from the pressure reducer 4 to the outdoor heat exchanger 5, and the other end connected to a pipe leading from the indoor heat exchanger 3 to the suction side of the compressor 1 via the four-way valve 2. The third bypass circuit 16 is equipped with a third two-way valve and the heat exchanger 9, and the heat exchanger 9 is arranged so that the heat storage material 11 can exchange heat. ing.

In the above configuration, the heating operation is the same as that in the first embodiment, so a description thereof will be omitted. During defrosting operation, the four-way valve 2 is switched to the cooling cycle, the second two-way valve 14 is closed, and the third
Let us open the two-way valve 17. As a result, the refrigerant discharged from the compressor 1 flows from the four-way valve 2 to the outdoor heat exchanger 5,
Defrosting is performed using the heat of the refrigerant, and most of the refrigerant flows into the third bypass circuit 16, passes through the third two-way valve 17, flows to the heat exchanger 9, and is absorbed by the heat storage material 11. is taken away and sucked into the compressor l.

In this embodiment as well, when storing heat in the heat storage tank lo,
The heat radiated from the conventional compressor 1 to the outside air and the heat from the high-temperature refrigerant heat in the second bypass circuit can be recovered simultaneously by bypassing the discharge pipe 15, and in any other refrigeration cycle. A similar effect can be obtained.

Effects of the Invention As is clear from the above embodiments, the present invention provides a heat storage tank filled with a heat storage material inside the compressor, which is disposed around the compressor in a heat exchange manner with the compressor, and from the discharge side of the compressor to the four-way valve. By installing a bypass circuit with one end connected to the discharge piping and the other end connected to the four-way valve side of the discharge piping, and by connecting the bypass circuit and the heat storage tank in a heat exchange manner, the amount of heat required for defrosting can be achieved in a short time. is obtained, and the required capacity during defrosting can be sufficiently obtained.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram of a heat pump type air conditioner showing a first embodiment of the present invention, Fig. 2 is a schematic cross-sectional view of the area around the compressor of the heat pump type air conditioner, and Fig. 3 is a diagram of the present invention. Fig. 4 is a refrigeration cycle diagram of a conventional heat pump type air conditioner showing another embodiment of the present invention. 1... Compressor, 2... Four-way valve, 3...
...Indoor heat exchanger, 4...Capillary tube (pressure reducer), 5...Outdoor heat exchanger, 6.
...First bypass circuit, 7... Two-way valve,
9... Heat exchanger, 10... Heat storage tank, 1
1... Heat storage material, 13... Second bypass circuit, 14... Second two-way valve, 15...
Discharge piping, 16...Third bypass circuit, 17.
...Third two-way valve.

Claims (1)

[Claims] A refrigerant circuit is constructed by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc., and a heat storage tank filled with a heat storage material is placed around the compressor to connect the compressor and the heat exchanger. A bypass circuit is provided which is arranged in an exchange manner and has one end connected to the discharge pipe leading from the discharge side of the compressor to the four-way valve and the other end connected to the four-way valve side of the discharge pipe, and the bypass circuit A heat pump type air conditioner, which has a flow path control means that can open and close a refrigerant flow path, and connects the bypass circuit and the heat storage tank in a heat exchange manner.