JPH0611204A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To reduce the flow rate of refrigerant passing through a heat exchanger when frosting occurs, by a method wherein a check valve and a supercooling heat exchange are connected to a circuit in which constrictions for heating are arranged parallel, and a liquid infection circuit branches off from a point between the check valve and the surpercooling heat exchanger. CONSTITUTION:During heating operation, high-temperature, high-pressure liquid refrigerant containing gas refrigerant is divided into two streams at a point upstream a supercooling heat exchanger 17a. One refrigerant stream is led to an expansion device 12 to reduce the pressure and turn it into low pressure refrigerant, and the low pressure refrigerant flows into a distributor 15 and then through distribution pipes 16a, 16b and 16c into an outdoor heat exchanger 17 where it absorbs heat and evaporates, and is sent toward a four-way valve 2. On the other hand, after the other refrigerant stream releases heat to condense and is supercooled in the heat exchanger 17a, it is led into a flow regulating pipe 14 to reduce the pressure, and injected into a compressor 1 through a liquid injection pipe 14 to cool the compressor 1. Thereby, the temperature inside the supercooling heat exchanger 17a is kept within a range in which frosting does not occur and the heat dissipation is restrained to a minimum, so that a reduction in the heating capability cant be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner.

[0002]

2. Description of the Related Art FIG. 6 shows a refrigerant circuit diagram of a conventional air conditioner.

In the figure, a conventional air conditioner is shown as a compressor 1,
Four-way valve 2, pipe joint 3, indoor / outdoor connecting pipe 4, pipe joint 5, indoor heat exchanger 6, expansion mechanisms 7a, 7b, distributor 8, pipe joint 9, indoor / outdoor connecting pipe 10, pipe joint 1
1, check valve 13, capillary tube 14, liquid injection tube 1
4a, expansion mechanism 12b, distributor 15, distribution pipes 16a, 1
6b, 16c, a heat exchanger 17a, an outdoor heat exchanger 17, and an accumulator 18.

During the cooling operation, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 enters the outdoor heat exchanger 17 via the four-way valve 2. Here, heat is radiated and condensed to become a high-pressure liquid refrigerant, which flows through the distribution pipes 16a, 16b, and 16c in each circuit, merges in the distributor 15, passes through the check valve 13, and enters the heat exchanger 17a. Here, the heat is dissipated and the liquid refrigerant becomes a supercooled liquid, and passes through the pipe joint 11, the indoor / outdoor connection pipe 10, and the pipe joint 9,
The expansion mechanisms 7a and 7b enter through the distributor 8. Here, the pressure is reduced to form a low-pressure liquid gas two-phase refrigerant. The two-phase refrigerant enters the indoor heat exchanger 6, undergoes endothermic evaporation in each circuit, passes through the pipe joint 5, the indoor / outdoor connecting pipe 4, and the pipe joint 3,
The accumulator 18 is entered via the four-way valve 2. Here, the liquid non-evaporated refrigerant accumulates in the lower portion, and the separated gas refrigerant is sucked into the compressor 1 and compressed.

On the other hand, during the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2, the pipe joint part 3, the indoor / outdoor connecting pipe 4, and the pipe joint part 5 and the indoor heat exchanger 6 to go into. Here, heat is condensed to become a high-pressure liquid refrigerant, and enters the expansion mechanisms 7a and 7b for each circuit. Here, the pressure is reduced to become a two-phase refrigerant containing a partial gas refrigerant, and enters the heat exchanger 17a through the pipe joint 9, the indoor / outdoor connection pipe 10, and the pipe joint 11. Here, heat is dissipated to become a supercooled liquid refrigerant and enters the expansion mechanism 12b. Here, the pressure is reduced to form a low-pressure liquid gas refrigerant, which is distributed by the distributor 15 and distributed to the distribution pipe 1.
It enters the outdoor heat exchanger 17 via 6a, 16b and 16c. Here, it endothermically evaporates and enters the accumulator 18 via the four-way valve 2. Here, the non-evaporated refrigerant is separated, and the gas refrigerant is returned to the compressor 1 and compressed. On the other hand, under a wide range of operating conditions, a liquid injection pipe 14a for injecting a liquid refrigerant into the compressor 1 and cooling the liquid refrigerant is provided so that the temperature inside the compressor 1 does not rise abnormally. During the cooling operation, the high-pressure liquid refrigerant after the check valve 13 is decompressed by the capillary tube 14 and passes through the liquid injection tube 14a to the compressor 1
Is injected into. Further, during the heating operation, the liquid refrigerant close to the high pressure that has been radiatively condensed by the heat exchanger 17a is decompressed by the capillary tube 14 and injected into the compressor 1 through the liquid injection tube 14a to cool it.

Since the heat absorption source of the outdoor heat exchanger 17 is air during the heating operation, the outdoor heat exchanger 17 is operated at a low outdoor temperature.
Frosts. Since the heat absorption efficiency decreases due to frost formation, defrosting is periodically performed by switching to the cooling operation cycle. Since the high temperature refrigerant flows through the heat exchanger 17a, the frost 21 does not form as shown in FIG. This prevents melted drain water from freezing on the bottom plate 20 by the defrost operation and improves drainage water drainage.

FIG. 8 is a refrigerant circuit diagram of another conventional air conditioner, which corresponds to the configuration in which the capillary tube 14 and the liquid injection tube 14a of FIG. 6 are removed.

That is, FIGS. 6 and 8 have the same structure except for the liquid injection flow path provided for cooling when the compressor 1 is heated.

[0009]

The above conventional air conditioner has the following problems to be solved.

That is, in the conventional air conditioner, the heat absorbing portion during the heating operation is the outdoor heat exchanger 17, and the heat radiating portion is the indoor heat exchanger 6 and the heat exchanger 17a below the outdoor heat exchanger 17. is there. It is the heat radiation from the indoor heat exchanger 6 that is used for heating, and the heat radiation from the heat exchanger 17a is discarded to the outside air.

When the outside air temperature, which is the heat absorption source of the outdoor heat exchanger 17, decreases, the temperature difference with the high temperature heat exchanger 17a becomes relatively large, and the amount of heat radiation also increases. As a result, the amount of heat radiated in the indoor heat exchanger 6 used for heating is reduced, which causes a problem that the heating capacity is significantly reduced.

In order to solve the above problems, the present invention has little or no effect on the heating capacity because the amount of liquid refrigerant passing through the heat exchanger (for supercooling) is cut off or becomes extremely small during frost formation. It is an object of the present invention to provide a heat pump type air conditioner that only radiates heat.

[0013]

As a means for solving the above problems, the present invention is to provide a heat pump type air conditioner as described in (1) and (2) below. (1). A compressor, a four-way valve, an outdoor heat exchanger, a heating throttle, a cooling throttle, and an indoor heat exchanger constitute a heat pump cycle, and the outdoor heat exchanger is divided into a plurality of circuits for cooling. In a heat pump type air conditioner that has a distributor on the outlet side of
A subcooling heat exchanger is installed in the lower part of the outdoor heat exchanger, and a circuit is provided for circulating the liquid refrigerant from the distributor through the check valve during cooling to the subcooling heat exchanger. A circuit having the heating throttle is connected in parallel with the stop valve and the supercooling heat exchanger, and a liquid injection circuit is connected to the compressor from between the check valve and the supercooling heat exchanger. A heat pump type air conditioner. (2). A compressor, a four-way valve, an outdoor heat exchanger, a heating throttle, a cooling throttle, and an indoor heat exchanger constitute a heat pump cycle, and the outdoor heat exchanger is divided into a plurality of circuits for cooling. In a heat pump type air conditioner that has a distributor on the outlet side of
A subcooling heat exchanger is installed in the lower part of the outdoor heat exchanger, and a check valve and a heating throttle parallel circuit for flowing a liquid refrigerant during cooling between the distributor and the subcooling heat exchanger. Is provided, and an opening / closing valve that opens and closes according to the outside air temperature is provided at the inlet of the heating throttle, and a bypass circuit having a flow rate adjusting means is connected in parallel with the supercooling heat exchanger and the opening / closing valve. Heat pump type air conditioner.

[0014]

Since the present invention is constructed as described above, it has the following actions.

(1). In the above configuration (1), during the heating operation, one of the liquid refrigerant containing the high-temperature and high-pressure gas refrigerant branched in front of the subcooling heat exchanger is decompressed by the heating throttle to become a low-pressure refrigerant. It flows to the outdoor heat exchanger. on the other hand,
The other liquid refrigerant containing the high-temperature and high-pressure gas refrigerant that branched off into the supercooling heat exchanger radiates heat and is supercooled, and is injected into the compressor through the liquid injection circuit to cool it. To do. As a result, the minimum amount of refrigerant required for liquid injection flows inside the heat exchanger for supercooling, heat dissipation to the outside air can be minimized, and heat exchange for supercooling located at the bottom of the outdoor heat exchanger Frost can be prevented because the vessel is kept at high temperature.

(2). In the above configuration (2), during heating operation, heat is radiated by the supercooling heat exchanger, and the supercooled liquid refrigerant passes through the open / close valve opened by the outside air temperature and is decompressed by the heating throttle. It becomes a low-pressure refrigerant and flows to the outdoor heat exchanger. When the outdoor heat exchanger is frosted and the heat dissipation to the outside air in the heat exchanger for supercooling becomes large, that is, when the outside air temperature drops significantly, the on-off valve closes to the closed state. The flow rate of the liquid refrigerant passing through the heating heat exchanger is significantly reduced and joins the inlet of the heating throttle. As a result, heat dissipation in the supercooling heat exchanger is minimized. On the other hand, the liquid refrigerant containing the gas refrigerant before the supercooling heat exchanger is decompressed by the flow rate adjusting means and further decompressed by the heating throttle to become a low pressure refrigerant and flows to the outdoor heat exchanger.

[0017]

Embodiments First to fifth embodiments of the present invention will be described with reference to FIGS. The same components as those in the conventional example or the previous example are designated by the same reference numerals, and the description thereof will be omitted except when necessary.

(First Embodiment) The first aspect of the invention of claim 1
An embodiment will be described with reference to FIG.

FIG. 1 is a refrigerant circuit diagram of this embodiment. Reference numeral 12 is an expansion mechanism (a heating throttle) provided in parallel with a check valve 13 and a supercooling heat exchanger 17a. Other configurations are the same as the configurations in which the expansion mechanism 12b is removed from the conventional example of FIG. That is, also in the present embodiment, the liquid injection pipe 14a having the flow rate adjusting pipe 14 is connected to the compressor 1 between the check valve 13 and the heat exchanger 17a, and the liquid refrigerant is flowed during operation. It is configured to prevent the temperature of the compressor from rising.

Next, the operation of the above configuration will be described.

In FIG. 1, the flow of the refrigerant is such that during the cooling operation, the liquid refrigerant condensed by heat dissipation in the outdoor heat exchanger 17 is the distribution pipe 16
Check valve 1 through a, 16b, 16c and distributor 15
Via 3 into the heat exchanger 17a. Here, heat is dissipated and becomes supercooled liquid, which flows to the pipe joint 11. The subsequent steps are the same as in the conventional example. Next, during the heating operation, the high-temperature / high-pressure liquid refrigerant containing the gas refrigerant in front of the supercooling heat exchanger 17a is branched into two, one of which enters the expansion mechanism 12 and is depressurized to become a low-pressure refrigerant, which is distributed. Enter the container 15 and the distribution pipe 16
It enters the outdoor heat exchanger 17 via a, 16b, and 16c.
Then, it is endothermicly evaporated here and flows to the four-way valve 2. The subsequent steps are the same as the conventional example. On the other hand, the other branched liquid refrigerant is radiatively condensed and supercooled in the heat exchanger 17a, is decompressed by the flow rate adjusting pipe 14, is liquid-injected into the compressor 1 through the liquid injection pipe 14a, and cools it. To do.

As described above, according to the first embodiment, during the heating operation, the liquid refrigerant passing through the supercooling heat exchanger 17a is provided only for cooling the compressor 1 unlike the prior art. Since the flow rate is small, the amount of heat released by the heat exchanger 17a is very small, and there is an advantage that the heating capacity of the air conditioner is hardly affected.

(Second Embodiment) Second embodiment according to the invention of claim 1
An embodiment will be described with reference to FIG.

FIG. 2 is a refrigerant circuit diagram of a main part of this embodiment, in which a check valve 13 and a heat exchanger 17a for supercooling are provided in a flow path having an expansion mechanism (heating throttle) 12 provided in parallel. On the upstream side of the expansion mechanism 12 as viewed from the flow of the liquid refrigerant during heating, an on-off valve 19 and a flow rate adjusting pipe 12a having a required flow rate resistance value are provided in parallel. The on-off valve 19 is controlled to be opened / closed by the temperatures detected by the heat exchange temperature sensor 19a and the outside air temperature sensor 19b which are separately provided. The other structure is similar to that of the first embodiment.

Next, the operation of the above configuration will be described.

In FIG. 2, during the cooling operation, the liquid refrigerant radiatively condensed by the outdoor heat exchanger 17 is distributed to the distribution pipes 16a, 16b, 1
6c, through the distributor 15, through the check valve 13, into the heat exchanger 17a. Here, heat is dissipated and becomes supercooled liquid, which flows to the pipe joint 11. The subsequent steps are the same as the conventional example. Next, during heating operation, one of the high-temperature and high-pressure liquid refrigerant containing the gas refrigerant branched in two in front of the subcooling heat exchanger 17a passes through the on-off valve 19, is decompressed by the expansion mechanism 12, and is at low pressure. It becomes the refrigerant and enters the distributor 15, and the distribution pipes 16a, 16
Enter the outdoor heat exchanger 17 via b and 16c. Then, it is endothermicly evaporated and flows into the four-way valve 2. The subsequent steps are the same as the conventional example.

On the other hand, the other branched liquid refrigerant is radiatively condensed and supercooled in the heat exchanger 17a, decompressed by the flow rate adjusting pipe 14, and then the compressor 1 is passed through the liquid injection pipe 14a.
Liquid is sprayed on and cooled.

The outdoor heat exchanger 17 is frosted and the expansion mechanism 12
When the operating point becomes improper due to excessive flow rate, the temperature is detected by the heat exchange temperature sensor 19a or the outside air temperature sensor 19b, the on-off valve 19 is closed, and the liquid refrigerant including the gas refrigerant is decompressed by the flow rate adjusting pipe 12a. Then, the pressure is reduced by the expansion mechanism 12 to become a low-pressure refrigerant, which flows to the distributor 15 and the distribution pipe 1
It enters the outdoor heat exchanger 17 via 6a, 16b and 16c. Endothermic evaporation occurs here. The subsequent steps are the same as the conventional example.
As described above, also in the case of the second embodiment, since only the liquid injection flow rate required for cooling the compressor 1 flows through the heat exchanger 17a, there is an advantage that the amount of heat radiated to the outside air is minimized and the heating capacity is less deteriorated. .

(Third Embodiment) A third embodiment according to the invention of claim 1.
An embodiment will be described with reference to FIG.

FIG. 3 is a refrigerant circuit diagram of an essential part of this embodiment, and a flow path having an opening / closing valve 19A between the heat exchanger 17a and the check valve 13 and between the expansion mechanism 12 and the flow rate adjusting pipe 12a. The structure is the same as that of the second embodiment except that the on-off valve 19 is removed, except that the above-mentioned is connected. The on-off valve 19A is the heat exchange temperature sensor 1
Opening / closing control is performed by 9a and the outside air temperature sensor 19b.

Next, the operation of the above configuration will be described.

In FIG. 3, the on-off valve 19A is used during the heating operation.
Opens. The flow of the refrigerant at this time is the same as that of the conventional example.

The outdoor heat exchanger 17 is frosted and the expansion mechanism 12
When the operating point becomes improper due to excessive flow rate, the temperature is detected by the heat exchange temperature sensor 19a or the outside air temperature sensor 19b, the on-off valve 19A is closed, and the gas refrigerant passing through the pipe joint 11 is included. The liquid refrigerant is decompressed by the flow rate adjusting pipe 12a and further decompressed by the expansion mechanism 12 to have an appropriate flow rate,
It flows to the distributor 15. The subsequent steps are the same as the conventional example.

On the other hand, as for the liquid injection amount necessary for cooling the compressor 1, the liquid refrigerant radiatively cooled by the heat exchanger 17a is injected into the compressor 1 through the flow rate adjusting pipe 14 and the liquid injection pipe 14a.

As described above, according to the third embodiment, when the difference between the heat exchanger 17a for supercooling and the outside air temperature is within the predetermined value, the on-off valve 19A is open, and therefore the heat exchanger 17a is passed through. Since a part of the liquid refrigerant that has been supercooled in advance is decompressed by the expansion mechanism 12 and enters the outdoor heat exchanger 17 through the distributor 15, there is an advantage that the heat absorption efficiency in the outdoor heat exchanger 17 is high.

Further, the outdoor air temperature decreases, and the outdoor heat exchanger 17
When the frost forms, the on-off valve 19A is closed and only the liquid refrigerant for liquid injection passes through the heat exchanger 17a.
There is an advantage that the amount of heat radiation is small and the heating capacity is hardly affected.

(Fourth Embodiment) The fourth invention according to claim 2
An embodiment will be described with reference to FIG.

FIG. 4 is a refrigerant circuit diagram of this embodiment, and 12 is a check valve 1 between the heat exchanger 17a for supercooling and the distributor 15.
Expansion mechanism (heating diaphragm) provided in parallel with 3; 19c
Is an on-off valve interposed at the inlet of the expansion mechanism 12 as seen from the flow of the liquid refrigerant during heating, 12b is a flow rate adjusting pipe provided in parallel with the heat exchanger 17a and the on-off valve 19c, and 14b is an on-off valve 19c. It is a flow control tube provided in parallel. It should be noted that the flow rate adjusting tube 12b and the flow rate controlling tube 14b are each given a predetermined resistance value. Other configurations are the same as the configurations in which the expansion mechanism 12b is removed from the conventional example of FIG. In addition,
The heat exchange temperature sensor 19a and the outside air temperature sensor 19b are the on-off valve 1.
9c is controlled.

Next, the operation of the above configuration will be described.

In FIG. 4, the flow of the refrigerant is such that during the cooling operation, the liquid refrigerant condensed by heat dissipation in the outdoor heat exchanger 17 is the distribution pipe 16
Check valve 1 through a, 16b, 16c and distributor 15
Via 3 into the heat exchanger 17a. Here, heat is dissipated and becomes supercooled liquid, which flows to the pipe joint 11. The subsequent steps are the same as the conventional example. During the heating operation, normally, the opening / closing valve 19c is opened, and the liquid refrigerant that radiates heat and is supercooled by the heat exchanger 17a passes through the opening / closing valve 19c, is decompressed by the expansion mechanism 12, becomes low-pressure refrigerant, and passes through the distributor 15. Then, enter the outdoor heat exchanger 17.
The outdoor heat exchanger 17 is frosted and supercooling heat exchanger 17a
In the case where the heat radiation to the outside air becomes large, the temperature is detected by the heat exchange temperature sensor 19a or the outside air temperature sensor 19b, and the on-off valve 19c is closed.

The flow rate of the liquid refrigerant discharged from the heat exchanger 17a is reduced by the flow rate control pipe 14b and merged with the inlet of the expansion mechanism 12. The flow resistance value of the flow control pipe 14b is set to a value such that the heat exchanger 17a has a temperature at which frost does not occur. As a result, the heat radiation amount of the heat exchanger 17a can be minimized. On the other hand, the liquid refrigerant containing the gas refrigerant in front of the heat exchanger 17a splits into the flow rate adjusting pipe 12b, and is decompressed there,
Further, the pressure is reduced by the expansion mechanism 12 and becomes low-pressure refrigerant, which flows to the distributor 15. The subsequent steps are the same as the conventional example.

As described above, according to the fourth embodiment, during normal heating operation, the liquid refrigerant supercooled through the supercooling heat exchanger 17a expands through the open on-off valve 19c. Since it enters the outdoor heat exchanger 17 through the mechanism 12 and the like, the heat absorption efficiency is high, and therefore the heating effect is also large, whereas in the case of frost, the on-off valve 19c is closed and the flow control pipe 14b is required to pass the narrowed minimum. Since only a limited amount of liquid refrigerant passes through the heat exchanger 17a, there is an advantage that the amount of heat radiation is small and the heating capacity is hardly affected.

(Fifth Embodiment) The fifth invention according to claim 2
An example will be described with reference to FIG.

FIG. 5 is a refrigerant circuit diagram of an essential part of this embodiment, which is the fourth embodiment except that the flow control pipe 14c is provided in parallel with the check valve 13.
This is the same as the configuration in which the flow rate control pipe 14b is removed from the embodiment.

Next, the operation of the above configuration will be described.

In FIG. 5, the opening / closing valve 19c is operated during the heating operation.
One of the liquid refrigerant that is opened and is radiated by the heat exchanger 17a and supercooled is decompressed through the flow rate control pipe 14c, becomes a low pressure refrigerant, and flows to the distributor 15. The other of the liquid refrigerants is decompressed through the on-off valve 19c and the expansion mechanism 12, becomes a low-pressure refrigerant, merges with the above, and flows to the distributor 15.

When the outdoor heat exchanger 17 is frosted and the heat dissipation to the outside air in the heat exchanger 17a for supercooling becomes large, the temperature is detected by the heat exchange temperature sensor 19a or the outside air temperature sensor 19b, The on-off valve 19c is closed. The liquid refrigerant exiting the heat exchanger 17a passes through the flow rate control pipe 14c and is reduced in pressure to become a low pressure refrigerant, which then flows to the distributor 15. The flow resistance value of the flow control pipe 14c is set to a value that allows the heat exchanger 17a to flow at a minimum flow rate at which the temperature does not frost. As a result, the heat radiation amount in the heat exchanger 17a can be minimized.

On the other hand, the liquid refrigerant containing the gas refrigerant in front of the heat exchanger 17a splits into the flow rate adjusting pipe 12b, is depressurized there, and is further depressurized by the expansion mechanism 12 to become a low pressure refrigerant, and flows to the distributor 15. . The subsequent steps are the same as the conventional example.

As described above, according to the fifth embodiment, during the normal heating operation, a part of the liquid refrigerant supercooled through the supercooling heat exchanger 17a is located upstream of the open / close valve 19c. Since it enters the flow rate control pipe 14c and the rest enters the expansion mechanism 12 through the on-off valve 19c, and joins in the vicinity of the outlet thereof and enters the outdoor heat exchanger 17 through the distributor 15, the endothermic effect is large. On the other hand, since the on-off valve 19c is closed during frosting, only the amount of liquid passing through the flow rate control pipe 14c passes through the heat exchanger 17a, so that the amount of heat radiation is significantly reduced and heating capacity is hardly impaired. There is.

[0050]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, during heating operation, particularly during frost formation, a small amount of refrigerant, which is the minimum amount necessary for liquid injection for compressor cooling, flows in the subcooling heat exchanger.
The temperature in the subcooling heat exchanger is in a range where frost does not occur, the amount of heat released to the outside air is minimized, and the decrease in heating capacity can be reduced.

According to the second aspect of the present invention, when the outdoor heat exchanger is frosted during the heating operation and the amount of heat radiated in the supercooling heat exchanger is large, the open / close valve is opened / closed by the outside air temperature. Since the flow rate is switched to the minimum flow rate at which the subcooling heat exchanger does not frost, the amount of heat radiated to the outside air is minimized, and the decrease in heating capacity in the indoor heat exchanger can be minimized.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of a first embodiment of the present invention,

FIG. 2 is a refrigerant circuit diagram of a main part of a second embodiment of the present invention,

FIG. 3 is a refrigerant circuit diagram of a main part of a third embodiment of the present invention,

FIG. 4 is a refrigerant circuit diagram of a fourth embodiment of the present invention,

FIG. 5 is a refrigerant circuit diagram of a main part of a fifth embodiment of the present invention,

FIG. 6 is a refrigerant circuit diagram of a conventional example,

FIG. 7 is a partial perspective view of an outdoor heat exchanger or the like of a conventional example,

FIG. 8 is a refrigerant circuit diagram of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 4-way valve 12 Expansion mechanism (throttle for heating) 12a, 12b Flow rate control pipe 13 Check valve 14 Flow rate control pipe 14a Liquid injection pipe 14b, 14c Flow control pipe 15 Distributor 17 Outdoor heat exchanger 17a Heat exchanger (For supercooling) 19,19A Open / close valve 19a Heat exchange temperature sensor 19b Outside air temperature sensor 19c Open / close valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiko Sakura, Masahiko Sasaki, Asahi-cho, 3-chome, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air-conditioner manufacturing plant (72) Takashi Ogawa Iwatsuka-cho, Nakamura-ku, Nagoya-shi, Aichi 1 at 60 Kujitanko Nakaryo Engineering Co., Ltd.

Claims (2)

[Claims] 1. A heat pump cycle is constituted by a compressor, a four-way valve, an outdoor heat exchanger, a heating throttle, a cooling throttle, and an indoor heat exchanger, and the outdoor heat exchanger is divided into a plurality of circuits. However, in the heat pump type air conditioner in which a distributor is arranged on the outlet side during cooling, a subcooling heat exchanger is installed under the outdoor heat exchanger, and the liquid from the distributor during cooling is installed. A circuit for circulating the refrigerant through the check valve to the subcooling heat exchanger is provided, and the check valve and the supercooling heat exchanger are connected in parallel to the circuit having the heating throttle and the check valve. A heat pump type air conditioner characterized in that a liquid injection circuit is connected to the compressor from between the heat exchanger and the supercooling heat exchanger. 2. A heat pump cycle is constituted by a compressor, a four-way valve, an outdoor heat exchanger, a heating throttle, a cooling throttle, and an indoor heat exchanger, and the outdoor heat exchanger is divided into a plurality of circuits. In a heat pump type air conditioner having a distributor on the outlet side during cooling, a subcooling heat exchanger is installed below the outdoor heat exchanger, and the distributor and the subcooling heat exchanger are installed. A parallel circuit of the check valve and the heating throttle provided between the exchanger and the liquid refrigerant during cooling is provided,
A heat pump type air characterized in that an opening / closing valve that opens and closes according to the outside air temperature is provided at the inlet of the heating throttle, and a bypass circuit having a flow rate adjusting means is connected in parallel with the supercooling heat exchanger and the opening / closing valve. Harmony machine.