JPH0331666A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To enable completion of defrosting in a short time by a method wherein a heat accumulating tank is arranged in a heat exchangeable state to the periphery of a compressor and connected to a first bypass circuit bypassing a pressure reducer and a piping running from the delivery side of the compressor to an indoor heat exchanger, and a second bypass circuit connected to a piping running to the suction side of the compressor is provided, and the first bypass circuit is connected in a heat-exchangeable state to the heat accumulating tank. CONSTITUTION:A heat accumulating tank 10 is disposed in a state to make heat exchangeable contact with the periphery of a compressor 1, and a heat exchanger 9 is disposed in a manner to be heat-exchangeable with a heat accumulating material 11 with which the interior of the heat accumulating tank is filled. A second bypass circuit 12 has the one end connected to a piping running from the delivery side of the compressor 1 through a four-way valve 2 to an indoor heat exchanger 3, and the other end connected to a piping running from an outdoor heat exchanger 5 through the four-way valve 2 to the suction side of the compressor 1. When, during defrosting operation, two-way valves 7 and 13 are opened, a part of a refrigerant delivered from the compressor 1 flows to the second bypass circuit 12, and most of the remaining refrigerant flows to the first bypass circuit 6 and a heat exchanger 9. The refrigerant derives heat from the heat accumulating material 11 and is joined with a refrigerant flowing through a capillary tube 4. The mixture flows to the outdoor heat exchanger 5, where defrosting is effected by utilizing heat which the refrigerant has.

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 being an AWI device and the indoor heat exchanger being an evaporator. At this time, the indoor fan was stopped to prevent cold drafts. With this method, the amount of refrigerant circulated during the refrigeration cycle is basically small and the electrical input to the compressor cannot be expected to increase much, so the defrosting time becomes longer and the indoor fan stops for several minutes during defrosting. This results in a lack of heating sensation, which impairs comfort.Furthermore, it takes time for the temperature of the indoor heat exchanger to rise after switching the four-way valve and returning to heating operation after the defrosting operation is completed, causing problems for the user. From that point of view, it was not satisfactory.

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

In the figure, 1 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, 25 is a bypass circuit that bypasses the capillary tube 4, and this bypass circuit 25 includes a two-way valve 2.
6, a check valve 27, and a heat exchanger 9 are provided. Also,
Reference numeral 10 denotes a heat storage tank, and this heat storage tank lO is arranged around the compressor l so as to be able to exchange heat, and is filled with a latent heat storage material (NaCHsC00.3H,0) 11. The heat exchanger 9 is configured to be able to exchange heat with the material 11.
is installed. Then, surround it with insulation material 2.
It is surrounded by 8. In this refrigeration cycle, the two-way valve 26 is closed during heating operation, and the refrigerant discharged from the compressor 1 is transferred to the four-way valve 2, the indoor heat exchanger 3, the capillary tube 4, the outdoor heat exchanger 5, and the four-way valve 26. It flows through valve 2 and is sucked into compressor 1. 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 10.

Next, the two-way valve 26 is opened during defrosting operation. As a result, the refrigerant discharged from the compressor 1 flows to the four-way valve 2 and the indoor heat exchanger 3, and after being used for heating, a small amount of refrigerant flows through the capillary tube 4 to the outdoor heat exchanger 5. ,
Most of the remaining refrigerant flows into the bypass circuit 25, passes through the two-way valve 26, flows to the heat exchanger 9, removes heat from the heat storage material 11, passes through the check valve 27, and then passes through the capillary tube 4. The refrigerant flows into 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 from the compressor to the outside air 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, during defrosting, most of the refrigerant flows from the indoor heat exchanger 3 to the bypass circuit 25, and is transferred to the heat exchanger 9 in the heat storage tank IO.
Since the gas absorbs heat from the heat storage material 11 and becomes a high-temperature superheated gas, the pressure loss within the heat exchanger 9 increases. In addition, in the case of a so-called separate type heat pump air conditioner in which the indoor unit and outdoor unit are installed separately and connected by connecting piping, the pressure in the connecting piping that connects the indoor heat exchanger 3 and the capillary tube 4 In addition to the loss, the refrigerant pressure at the inlet of the outdoor heat exchanger 5 became low, so the temperature difference between the frost and the refrigerant became small, and the defrosting ability was not very large.

Therefore, although defrosting can be performed while maintaining high heating capacity, it is difficult to shorten the defrosting time. In particular, when defrosting is performed when there is not much heat stored in the heat storage tank, or when there is a large amount of frost and the stored heat is used up during defrosting, complete defrosting may not be possible. There was a risk.

Furthermore, during defrosting, the refrigerant becomes a high-temperature superheated gas at the inlet of the outdoor heat exchanger 5, so there is a large pressure loss when passing through the outdoor heat exchanger 5, which also causes a reduction in defrosting performance. .

In view of the above problems, the present invention uses a refrigeration cycle with a simple configuration that utilizes heat storage to finish defrosting in a short time. The purpose is to improve the ability of the students.

In addition, the present invention can completely defrost even when defrosting is performed when there is not much heat stored in the heat storage tank, or when the amount of frost is large and the stored heat is used up during defrosting. The aim is to be able to do so.

Means for Solving 11 Problems In order to solve the above problems, the heat pump type air conditioner of the present invention has a refrigerant circuit that connects a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc. , a heat storage tank filled with a heat storage material therein is disposed around the compressor in a heat exchange manner with the compressor, and a first bypass circuit bypasses the pressure reducer and a discharge side of the compressor. a second bypass circuit having one end connected to a pipe leading to the indoor heat exchanger via the four-way valve and the other end connected to a pipe leading from the outdoor heat exchanger to the suction side of the compressor via the four-way valve; The refrigerant flow path between the first bypass circuit and the pressure reducer can be switched, or the refrigerant flow path of the first bypass circuit can be opened and closed, and the refrigerant flow path of the second bypass circuit can be opened and closed. The first bypass circuit and the heat storage tank are connected in a heat exchange manner.

In addition, another heat pump type air conditioner of the present invention has a refrigerant circuit configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc., and a heat storage medium filled with a heat storage material. A tank is arranged around the compressor for heat exchange with the compressor, one end is connected to a pipe leading from the indoor heat exchanger to the pressure reducer, and the other end is connected to a pipe from the pressure reducer to the outdoor heat exchanger. A third bypass circuit is provided which is branched and connected to a pipe leading to the outdoor heat exchanger and a pipe leading to the suction side of the compressor via the four-way valve, and the third bypass circuit and the pressure reducer are connected to each other. The third bypass circuit and the heat storage tank are connected in a heat exchange manner, and have a wave path control means that enables switching of the refrigerant flow path or opening and closing of the refrigerant flow path of the third bypass circuit. .

In addition, another heat pump type air conditioner of the present invention has a refrigerant circuit configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc., and a heat storage medium filled with a heat storage material. A tank is arranged around the compressor in a heat exchange manner with the compressor, and a first bypass circuit bypasses the pressure reducer and a discharge side of the compressor is connected to the indoor heat exchanger via the four-way valve. A fourth bypass circuit is provided, one end of which is connected to a pipe leading from the pressure reducer to the outdoor heat exchanger, and the other end is connected to a pipe leading from the pressure reducer to the outdoor heat exchanger, and the refrigerant flow path between the first bypass circuit and the pressure reducer can be switched. or a flow path control means for opening and closing the refrigerant flow path of the first bypass circuit and for opening and closing the refrigerant flow path of the fourth bypass circuit;
The bypass circuit and the heat storage tank are connected for heat exchange.

In addition, another heat pump type air conditioner of the present invention has a refrigerant circuit configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc., and a heat storage medium filled with a heat storage material. A tank is disposed around the compressor for heat exchange with the compressor, one end is connected to a pipe leading from the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the other end is connected to the pipe connected to the indoor heat exchanger. A fourth bypass circuit connected to piping from the pressure reducer to the outdoor heat exchanger is provided, and has wave path control means for opening and closing the refrigerant flow path of the fourth bypass circuit, and the fourth bypass circuit and the heat storage Tanks are connected for heat exchange.

In addition, another heat pump type air conditioner of the present invention has a refrigerant circuit configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc., and a heat storage medium filled with a heat storage material. A tank is disposed around the compressor for heat exchange with the compressor, one end is connected to a pipe leading from the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the other end is connected to the pipe connected to the indoor heat exchanger. A fifth bypass circuit is provided that is branched and connected to a pipe leading from the pressure reducer to the outdoor heat exchanger and a pipe leading from the outdoor heat exchanger to the suction side of the compressor via the four-way valve, and The fifth bypass circuit and the heat storage tank are connected in a heat exchange manner, including a flow path control means for opening and closing a refrigerant flow path of the circuit.

In addition, another heat pump type air conditioner of the present invention has a refrigerant circuit configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer, an outdoor heat exchanger, etc., and a heat storage medium filled with a heat storage material. A tank is arranged around the compressor for heat exchange with the compressor, and one end is connected to a pipe leading from the indoor heat exchanger to the pressure reducer or a pipe leading from the pressure reducer to the outdoor heat exchanger. , a sixth bypass circuit is provided whose other end is connected to piping from the indoor heat exchanger to the suction side of the compressor via the four-way valve, and the refrigerant flow path of the sixth bypass circuit can be opened and closed. It has a control means, and connects the sixth range bypass circuit and the front metal heat storage tank in a heat exchange manner.

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

In other words, a heat storage tank filled with a heat storage material inside is arranged around the compressor for heat exchange with the compressor, and a first bypass circuit that bypasses the pressure reducer and a four-way valve are connected to the indoor air from the discharge side of the compressor. A second bypass circuit is provided in which one end is connected to the piping leading to the heat exchanger and the other end is connected to the outdoor heat exchanger via a four-way valve to the suction side of the compressor, and the first bypass circuit and the heat storage tank are connected. By connecting them for heat exchange, the pressure of the refrigerant flowing into the outdoor heat exchanger during defrosting can be kept higher than before, increasing the defrosting ability and completing defrosting in an extremely short time.

In addition, the - end is connected to the piping from the indoor heat exchanger to the pressure reducer, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger and from the outdoor heat exchanger to the suction side of the compressor via the four-way valve. By providing a third bypass circuit branched and connected to the piping and connecting the third bypass circuit and the heat storage tank for heat exchange, the pressure loss of the refrigerant passing through the outdoor heat exchanger during defrosting is reduced. This increases the defrosting ability and allows defrosting to be completed in an extremely short time.

In addition, one end is connected to the first bypass circuit that bypasses the pressure reducer and piping from the discharge side of the compressor to the indoor heat exchanger via a four-way valve, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger. By providing a fourth bypass circuit and connecting the first bypass circuit and the heat storage tank in a heat exchange manner, hot gas discharged from the compressor during defrosting is guided to the outdoor heat exchanger.
In addition, since the pressure of the refrigerant flowing into the outdoor heat exchanger can be maintained higher than before, the defrosting ability can be increased and defrosting can be completed in a short time.

In addition, a fourth bypass circuit is provided in which one end is connected to the pipe leading to the indoor heat exchanger via the compressor discharge J four-way valve, and the other end is connected to the pipe leading from the pressure reducer to the outdoor heat exchanger. By connecting the circuit and the heat storage tank in a heat exchange manner, hot gas discharged from the compressor during defrosting is guided to the outdoor heat exchanger via the heat storage tank, so hot gas that is always at high temperature is sent to the outdoor heat exchanger. Since the pressure of the refrigerant flowing into the outdoor heat exchanger can be kept higher than before, the defrosting ability can be increased and defrosting can be completed in a short time.

In addition, one end is connected to the piping from the discharge side of the compressor to the indoor heat exchanger via a four-way valve, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger and from the outdoor heat exchanger to the compressor via the four-way valve. By providing a fifth bypass circuit that branches off and connects to the piping leading to the machine suction side, and by connecting the fifth bypass circuit and the heat storage tank in a heat exchange manner, the hot gas discharged from the compressor during defrosting can be stored as heat. This allows hot gas at a constant temperature to flow into the outdoor heat exchanger, and also keeps the pressure of the refrigerant flowing into the outdoor heat exchanger higher than before. Since the pressure loss of the refrigerant passing through the exchanger can also be reduced, the defrosting ability can be increased and defrosting can be completed in an extremely short time.

Also, connect one end to the piping from the indoor heat exchanger to the pressure reducer or from the pressure reducer to the outdoor heat exchanger, and connect the other end to the piping from the indoor heat exchanger to the compressor suction side via the four-way valve. By providing a connected sixth bypass circuit and connecting the sixth bypass circuit and the heat storage tank for heat exchange, the stored heat can be taken out in a short time without impairing indoor comfort during defrosting. , you can finish defrosting in a short time.

Therefore, in any of the above embodiments, waste heat from the compressor is stored during heating, and this stored heat is used during defrosting to finish defrosting in a short time and perform heating again. Therefore, it is possible to improve the cumulative heating capacity.

In addition, in any of the above embodiments, even when defrosting is performed when there is not much heat stored in the heat storage tank, or when the amount of frost is large and the stored heat is used up during defrosting, , can be completely defrosted.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. In explaining this embodiment, parts having the same functions as the conventional one shown in FIG. 8 are given the same numbers, and the explanation will be omitted.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a refrigeration cycle diagram in a first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the area around the compressor in FIG. 1. In the figure, 6 is a first bypass circuit that bypasses the capillary tube 4, and this first bypass circuit 6 is equipped with a two-way valve 7, a check valve 8, and a heat exchanger 9. In addition, 1O is a heat storage tank, and this heat storage tank 1O is arranged around the compressor 1 so as to be able to exchange heat, and contains a latent heat storage material (N a CHs Coo ・3 Hg
O) 11 is filled, and the heat exchanger 9 is arranged so as to be able to exchange heat with this heat storage material 11. Also,
12 has one end connected to a pipe leading from the discharge side of the compressor 1 to the indoor heat exchanger 3 via the four-way valve 2, and the other end connected to the outdoor heat exchanger 5.
This is a second bypass circuit connected to piping from the compressor 1 to the suction side of the compressor 1 via a four-way valve 2, and this second bypass circuit 12 is equipped with a two-way valve 13.

In this refrigeration cycle, the two-way valve 7 and the two-way valve 13 are closed during heating operation, and the refrigerant discharged from the compressor l is transferred to the four-way valve 2, the indoor heat exchanger 3, the capillary tube 4, and the outdoor heat It flows through the exchanger 5 and the four-way valve 2, and is sucked into the compressor 1. 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 10.

Next, during defrosting operation, the two-way valve 7 and the two-way valve 13 are opened. As a result, a part of the refrigerant discharged from the compressor 1 flows into the second bypass circuit 12, and the remaining refrigerant flows through the four-way valve 2,
After flowing into the indoor heat exchanger 3 and being used for heating, a small amount of the refrigerant flows through the capillary tube 4 to the outdoor heat exchanger 5, and most of the remaining refrigerant flows into the first bypass circuit 6. The heat storage material 1 flows through the two-way valve 7 to the heat exchanger 9.
The refrigerant absorbs heat from the refrigerant 1, passes through the check valve 8, joins with the refrigerant that has passed through the capillary tube 4, and flows to the outdoor heat exchanger 5. Here, defrosting is performed using the heat of the refrigerant, and after passing through the four-way valve 2, the second bypass circuit 12
It joins with the refrigerant that has passed through and is sucked into the compressor 1.

In this way, the heat that was conventionally radiated from the compressor l to the outside air can be recovered and used for defrosting, increasing energy efficiency.Furthermore, by providing the second bypass circuit 12, the defrosting Since the pressure of the refrigerant flowing into the outdoor heat exchanger 5 can be kept higher than before, the difference between the saturation temperature of the refrigerant and the frost temperature increases, increasing the defrosting ability.
You can finish defrosting in a short period of time.

In addition, even when defrosting is performed when there is not much heat stored in the heat storage tank, or when the amount of frost is large and the stored heat is used up during defrosting, the heat flows into the outdoor heat exchanger 5. Since the saturation temperature of the refrigerant can be kept higher than the frost temperature, complete defrosting can be achieved.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a refrigeration cycle diagram in a second embodiment of the present invention. In the figure, 14 connects one end to the piping from the indoor heat exchanger 3 to the capillary tube 4, and the other end connects the piping from the capillary tube 4 to the outdoor heat exchanger 5 and the four-way valve 2 from the outdoor heat exchanger 5. This is a third bypass circuit that is branched and connected to the piping that reaches the suction side of the compressor 1 through the
6. A heat exchanger 9 is provided, and the heat exchanger 9 is arranged so as to be able to exchange heat with the heat storage material 11.

In this refrigeration cycle, the two-way valve 15 is opened during defrosting operation. As a result, the cold 1 discharged from the compressor 1 flows to the four-way valve 2 and the indoor heat exchanger 3, and after being used for heating, a small amount of refrigerant flows through the capillary tube 4 to the outdoor heat exchanger 5. Most of the remaining refrigerant flows into the third bypass circuit 14 and passes through the two-way valve 15 to the heat exchanger 9 to remove heat from the heat storage material 11.
After passing through the refrigerant 6, it joins with the refrigerant that has passed through the capillary tube 4 and flows to the outdoor heat exchanger 5. Here, defrosting is performed using the heat of the refrigerant, and after passing through the four-way valve 2, it joins with the remaining refrigerant that bypassed the outdoor heat exchanger 5 and is sucked into the compressor 1.

In this embodiment, by providing the third bypass circuit 14, the pressure loss of the refrigerant passing through the outdoor heat exchanger 5 can be kept lower than before, thereby increasing the defrosting ability and defrosting in an extremely short time. I can finish it.

Next, a third embodiment of the present invention will be described with reference to FIG.

FIG. 4 is a refrigeration cycle diagram in a third embodiment of the present invention. In the figure, reference numeral 17 has one end connected to the pipe leading from the discharge side of the compressor to the indoor heat exchanger 3 via the four-way valve 2, and the other end connected to the pipe leading from the capillary tube 4 to the outdoor heat exchanger 5. This fourth bypass circuit 17 is equipped with a two-way valve 18 and a check valve 19.

In this refrigeration cycle, the two-way valve 7 and the two-way valve 18 are opened during defrosting operation. As a result, a part of the refrigerant discharged from the compressor 1 flows to the fourth bypass circuit 17,
The remaining refrigerant 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 most of the remaining refrigerant flows to the outdoor heat exchanger 5. 1 flows into the bypass circuit 6, passes through the two-way valve 7, flows to the heat exchanger 9, removes heat from the heat storage material 11, passes through the check valve 8, and joins with the refrigerant that has passed through the capillary tube 4. It flows to the outdoor heat exchanger 5. After joining the refrigerant flowing through the fourth bypass circuit 17 at the entrance of the outdoor heat exchanger 5, defrosting is performed using the heat of the refrigerant, and after passing through the four-way valve 2, the compressor 1 is inhaled.

In this embodiment, by providing the fourth bypass circuit 17, hot gas discharged from the compressor 1 during defrosting is guided to the outdoor heat exchanger 5, and the pressure of the refrigerant flowing into the outdoor heat exchanger 5 is controlled. Since the temperature can be maintained higher than before, the defrosting ability can be increased and defrosting can be completed in an extremely short time.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a refrigeration cycle diagram in a fourth embodiment of the present invention. In the figure, reference numeral 17 has one end connected to the pipe leading from the discharge side of the compressor to the indoor heat exchanger 3 via the four-way valve 2, and the other end connected to the pipe leading from the capillary tube 4 to the outdoor heat exchanger 5. This fourth bypass circuit 17 includes a two-way valve 18, a heat exchanger 9, and a check valve 19.
The heat exchanger 9 is arranged so as to be able to exchange heat with the heat storage material 11.

In this refrigeration cycle, the two-way valve 18 is
Let's open. As a result, a part of the refrigerant discharged from the compressor l flows into the fourth bypass circuit 17, passes through the two-way valve 18, flows to the heat exchanger 9, and removes heat from the heat storage material 11.
After passing through the check valve 19, it flows to the outdoor heat exchanger 5. The remaining refrigerant flows to the four-way valve 2 and the indoor heat exchanger 3, and after being used for heating, it flows through the capillary tube 4 to the outdoor heat exchanger 5, and is connected to the fourth bypass circuit at the inlet of the outdoor heat exchanger 5. After joining with the refrigerant flowing through the refrigerant 17, the refrigerant defrosts using the heat of the refrigerant, and after passing through the four-way valve 2, it is sucked into the compressor.

In this embodiment, by providing the fourth bypass circuit 17 and the heat exchanger 9, the hot gas discharged from the compressor 1 during defrosting is guided to the outdoor heat exchanger 5 via the heat storage tank 10, so that the heat exchanger 9 is always provided. High-temperature hot gas can flow into the outdoor heat exchanger 5, and the pressure of the refrigerant flowing into the outdoor heat exchanger 5 can be maintained higher than before, increasing the defrosting ability and defrosting in an extremely short time. can finish.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a refrigeration cycle diagram in a fifth embodiment of the present invention. In the figure, 20 connects one end to a pipe leading from the discharge side of the compressor 1 to the indoor heat exchanger 3 via the four-way valve 2, and connects the other end to the pipe leading from the capillary tube 4 to the outdoor heat exchanger 5 and the outdoor heat exchanger 5. From the exchanger 5 to the compressor l via the four-way valve 2
The fifth bypass circuit is branched and connected to the piping leading to the suction side of the
1, a heat exchanger 9 and a check valve 22 are provided, and the heat exchanger 9 is arranged so as to be able to exchange heat with the heat storage material 11.

In this refrigeration cycle, the two-way valve 21 is
Let's open. As a result, a part of the refrigerant discharged from the compressor 1 flows into the fifth bypass circuit 20, passes through the two-way valve 21, flows to the heat exchanger 9, and removes heat from the heat storage material 11.
After passing through the check valve 22, a part of the refrigerant flows to the outdoor heat exchanger 5, and the remaining refrigerant bypasses the outdoor heat exchanger 5 and flows to the suction side of the compressor 1.

In this embodiment, by providing the heat exchanger 9 in the fifth bypass circuit 20, hot gas discharged from the compressor 1 during defrosting is guided to the outdoor heat exchanger 5 via the heat storage tank 10, so that the heat exchanger 9 is always provided in the fifth bypass circuit 20. Since high-temperature hot gas can be made to flow into the outdoor heat exchanger 5 and the pressure of the refrigerant flowing into the outdoor heat exchanger 5 can be maintained higher than before, the defrosting ability can be enhanced. In addition, some refrigerant is transferred to the outdoor heat exchanger 5.
Since the pressure loss of the refrigerant passing through the outdoor heat exchanger 5 can be reduced by bypassing the refrigerant, the defrosting ability can be further increased and defrosting can be completed in an extremely short time.

Next, a sixth embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a refrigeration cycle diagram in a sixth embodiment of the present invention. In the figure, 23 has one end connected to a pipe leading from the capillary tube 4 to the outdoor heat exchanger 5, and the other end connected to the pipe leading from the indoor heat exchanger 3 to the suction side of the compressor 1 via the four-way valve 2. This is the sixth bypass circuit.
The bypass circuit 23 is equipped with a two-way valve 24 and a heat exchanger 9, and the heat exchanger 9 is arranged so as to be able to exchange heat with the heat storage material 11.

In this refrigeration cycle, during defrosting operation, the four-way valve 2 is switched to the cooling cycle, and the two-way valve 24 is opened. As a result, the refrigerant discharged from the compressor 1 flows from the four-way valve 2 to the outdoor heat exchanger 5, and defrosts using the heat of the refrigerant. The heat storage material 11 flows into the heat exchanger 9 through the two-way valve 24.
It absorbs more heat and flows to the suction side of the compressor 1.

In this embodiment, a sixth bypass circuit 23 is provided,
By disposing the heat exchanger 9 in this, almost no refrigerant flows into the indoor heat exchanger 3, so the stored heat can be taken out in a short time without impairing indoor comfort during defrosting. Defrosting can be completed in an extremely short time.

The compressor 1 shown in the first to sixth embodiments may be of a fixed capacity, but it may be of a variable capacity type, such as a variable frequency compressor using an inverter. In this case, by performing high-capacity operation during defrosting, the defrosting time can be further shortened.

Further, in the above embodiment, the heat storage tank 10 is attached around the compressor 1, but the heat storage tank 10 is filled with a heat storage material 11,
It may be a closed container housing the heat exchanger 9 and the compressor 1, or a part of the outer peripheral surface of the compressor 1 may be a part of the heat storage tank.

Further, instead of the capillary tube 4 shown in the first to sixth embodiments, a variable throttle such as an electric expansion valve driven by a stepping motor or the like may be used. In this case, for example, in the first embodiment, by fully opening the electric expansion valve during defrosting, all the refrigerant that has passed through the indoor heat exchanger 3 flows to the first bypass circuit 6, so that the heat exchange capacity of the heat exchanger 9 is reduced. This increases the defrosting time and further shortens the defrosting time. Further, in the case of the fourth and fifth embodiments, by fully opening the electric expansion valve during defrosting, there is no refrigerant accumulation in the indoor heat exchanger 3, and the defrosting time can be shortened.

Further, although not shown in this embodiment, an auxiliary pressure reducer such as a capillary tube may be provided in the first to sixth bypass circuits to adjust the refrigerant circulation amount.

Effects of the Invention As is clear from the above embodiments, the present invention provides a first bypass circuit in which a heat storage tank filled with a heat storage material is disposed around a compressor in a heat exchange manner with the compressor, thereby bypassing a pressure reducer. and a second pipe having one end connected to the pipe leading from the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the other end connected to the pipe leading from the outdoor heat exchanger to the suction side of the compressor via the four-way valve. By providing a bypass circuit and connecting the first bypass circuit and the heat storage tank for heat exchange, the pressure of the refrigerant flowing into the outdoor heat exchanger during defrosting can be maintained higher than before, increasing the defrosting ability. Defrosting can be completed in an extremely short time.

In addition, one end is connected to the piping from the indoor heat exchanger to the pressure reducer, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger, and the piping from the outdoor heat exchanger to the suction side of the compressor via a four-way valve. By providing a third bypass circuit that is branched and connected to the third bypass circuit and connecting the third bypass circuit and the heat storage tank for heat exchange, it is possible to reduce the pressure loss of the refrigerant passing through the outdoor heat exchanger during defrosting. This increases the defrosting ability and allows defrosting to be completed in an extremely short time.

In addition, one end is connected to the first bypass circuit that bypasses the pressure reducer and piping from the discharge side of the compressor to the indoor heat exchanger via a four-way valve, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger. By providing a fourth bypass circuit and connecting the first bypass circuit and the heat storage tank in a heat exchange manner, hot gas discharged from the compressor during defrosting can be guided to the outdoor heat exchanger, and can also be routed to the outdoor heat exchanger. Since the pressure of the inflowing refrigerant can be maintained higher than before, the defrosting ability is increased and defrosting can be completed in an extremely short time.

In addition, a fourth bypass circuit is provided, in which one end is connected to the pipe leading from the discharge side of the compressor to the indoor heat exchanger via a four-way valve, and the other end is connected to the pipe leading from the pressure reducer to the outdoor heat exchanger.
By connecting the bypass circuit and the heat storage tank in a heat exchange manner, the hot gas discharged from the compressor during defrosting is guided to the outdoor heat exchanger via the heat storage tank, so the high temperature hot gas is always transferred to the outdoor heat exchanger. Since the pressure of the refrigerant flowing into the outdoor heat exchanger can be maintained higher than before, the defrosting ability can be increased and defrosting can be completed in an extremely short time.

In addition, one end is connected to the piping from the discharge side of the compressor to the indoor heat exchanger via a four-way valve, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger and from the outdoor heat exchanger to the compressor via the four-way valve. By providing a fifth bypass circuit that branches off and connects to the piping leading to the machine suction side, and by connecting the fifth bypass circuit and the heat storage tank in a heat exchange manner, the hot gas discharged from the compressor during defrosting can be stored as heat. Since it is led to the outdoor heat exchanger through the tank, the hot gas can always flow into the outdoor heat exchanger, and the pressure of the refrigerant flowing into the outdoor heat exchanger can be kept higher than before, and the outdoor heat exchanger Since the pressure loss of the refrigerant passing through the container can also be reduced, the defrosting ability can be increased and defrosting can be completed in an extremely short time.

Also, connect one end to the piping from the indoor heat exchanger to the pressure reducer or from the pressure reducer to the outdoor heat exchanger, and connect the other end to the piping from the indoor heat exchanger to the compressor suction side via the four-way valve. By providing a connected sixth bypass circuit and connecting the sixth bypass circuit and the heat storage tank for heat exchange, the stored heat can be taken out in a short time without impairing indoor comfort during defrosting. , defrosting can be completed in an extremely short time.

As is clear from the above, the present invention stores the waste heat of the compressor during heating, and uses this stored heat during defrosting to finish defrosting in an extremely short time and perform heating again. Therefore, it is possible to improve the cumulative heating capacity.

In addition, even when defrosting is performed when there is not much heat stored in the heat storage tank, or when there is a large amount of frost and the stored heat is used up during defrosting, it is possible to completely defrost. .

Therefore, it is possible to significantly improve comfort especially when performing heating at low outside temperatures.

[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 heat pump air conditioner showing the second embodiment of the present invention, and Fig. 5 is a refrigeration cycle diagram of a heat pump air conditioner without showing the third embodiment of the present invention. A refrigeration cycle diagram of a heat pump type air conditioner showing a fourth embodiment, and FIG. 6 is a refrigeration cycle diagram of an air conditioner according to a fifth 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 (flow path control means), 9... Heat exchanger, 10...
...Thermal storage tank, 11...Thermal storage material, 12...
・Second bypass circuit, 13... Two-way valve (flow path control means), 14... Third bypass circuit, 15...
...Two-way valve (flow path control means), 17...
Fourth bypass circuit, 18... Two-way valve (flow path control means), 20... Fifth bypass circuit, 21...
... Two-way valve (flow path control means), 23 ... Sixth bypass circuit, 24 ... Two-way valve (flow path control means).

Claims (6)

[Claims] (1) 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 compress the a first bypass circuit arranged to exchange heat with the compressor and bypassing the pressure reducer; one end connected to a pipe leading from the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the other end and a second bypass circuit connected to piping from the outdoor heat exchanger to the suction side of the compressor via the four-way valve, and the refrigerant flow path between the first bypass circuit and the pressure reducer can be switched. or a flow path control means for opening and closing the refrigerant flow path of the first bypass circuit and for opening and closing the refrigerant flow path of the second bypass circuit, and the first bypass circuit and the heat storage tank. A heat pump air conditioner connected for heat exchange. (2) 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 compress the one end is connected to the piping from the indoor heat exchanger to the pressure reducer, and the other end is connected to the piping from the pressure reducer to the outdoor heat exchanger and from the outdoor heat exchanger. A third bypass circuit branched and connected to the piping leading to the suction side of the compressor via the four-way valve is provided, and the refrigerant flow path between the third bypass circuit and the pressure reducer can be switched. A heat pump type air conditioner including a flow path control means for opening and closing a refrigerant flow path of the third bypass circuit, and in which the third bypass circuit and the heat storage tank are connected in a heat exchange manner. (3) 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 compress the A first bypass circuit is arranged to exchange heat with the compressor, and the other end is connected to a first bypass circuit that bypasses the pressure reducer, and a pipe leading from the discharge side of the compressor to the indoor heat exchanger via the four-way valve. A fourth bypass circuit connected to piping from the pressure reducer to the outdoor heat exchanger is provided, and the refrigerant flow path between the first bypass circuit and the pressure reducer can be switched, or the refrigerant in the first bypass circuit is A heat pump type air conditioner comprising a flow path control means for opening and closing a flow path and for opening and closing a refrigerant flow path of the fourth bypass circuit, and connecting the first bypass circuit and the heat storage tank in a heat exchange manner. Machine. (4) 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 compress the one end is connected to a pipe that runs from the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the other end runs from the pressure reducer to the outdoor heat exchanger. A heat pump that is provided with a fourth bypass circuit connected to piping, has flow path control means for opening and closing a refrigerant flow path of the fourth bypass circuit, and connects the fourth bypass circuit and the heat storage tank in a heat exchange manner. type air conditioner. (5) 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 compress the one end is connected to a pipe that runs from the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the other end runs from the pressure reducer to the outdoor heat exchanger. a fifth bypass circuit branched and connected to the piping and the piping leading from the outdoor heat exchanger to the compressor suction side via the four-way valve;
A heat pump type air conditioner including a flow path control means for opening and closing a refrigerant flow path of the fifth bypass circuit, and in which the fifth bypass circuit and the heat storage tank are connected in a heat exchange manner. (6) 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 compress the one end is connected to a pipe from the indoor heat exchanger to the pressure reducer or from the pressure reducer to the outdoor heat exchanger, and the other end is connected to the pipe from the indoor heat exchanger to the outdoor heat exchanger. A sixth bypass circuit is provided which is connected to the piping leading to the compressor suction side via the four-way valve, and includes flow path control means for opening and closing the refrigerant flow path of the sixth bypass circuit, A heat pump type air conditioner in which a circuit and the heat storage tank are connected in a heat exchange manner.