JP2001330341A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for keeping the temperature of engine water within a proper range and for inhibiting the decrease in capacity in heating operation in a defrosting mode. SOLUTION: In this air conditioner, a compressor 120 that is driven by an engine 110 is connected to the refrigerant pipeline of an indoor side heat exchanger 122 and an outdoor side heat exchanger 124 via a four-way valve 121, a refrigerant pipe 132, a bypass switching valve 137, a water heat exchanger 133 are provided at a bypass pipeline where one end side is connected to the high-pressure liquid pipe of the refrigerant pipeline and the other side is connected to a pipeline reaching the indoor side heat exchanger 122 from the four- way valve 121, and the water heat exchanger 133 and a radiator 111 are connected in parallel with the cooling water pipeline of the engine 110. In the air conditioner, the cooling water pipeline in the engine 110 is provided with an engine water temperature sensor 30 for detecting the temperature of the cooling water of the engine 110, and the cooling water pipeline at the output side of the engine 110 is provided with a first amount-of-water control valve 10 that is connected to the input side of the cooling water of the water heat exchanger 133.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas heat pump type air conditioner which solves the problems of effective recovery of engine exhaust heat and securing of engine water temperature.

[0002]

2. Description of the Related Art A technique for effectively recovering engine exhaust heat is disclosed in, for example, a gas heat pump refrigeration apparatus described in Japanese Patent Application Laid-Open No. 60-29559. A technique for performing a defrosting operation during heating is disclosed in, for example, a gas heat pump refrigeration apparatus described in Japanese Patent Application Laid-Open No. 3-105174.

A first conventional example is disclosed in Japanese Patent Application Laid-Open No. 60-295.
FIG. 7 shows a gas heat pump refrigeration apparatus (air conditioner) disclosed in Japanese Patent Publication No. 59-59. The compressor 120 driven by the engine 110 is connected to a use-side (indoor) heat exchanger 122, a pressure reducing element 123, and a heat-source-side (outdoor) heat exchanger 1.
In the heat pump refrigeration apparatus connected to the refrigerant line of No. 24 via the four-way valve 121, the high-pressure liquid pipe 131 of the refrigerant line
A refrigerant pump 132, a bypass on-off valve 137, and a water heat exchanger 133 of the engine 110
And the water heat exchanger 133 and the radiator 11
1 is connected in parallel to the cooling water pipe of the engine 110 via the three-way valve 136, and the three-way valve 136 is proportionally controlled based on the pressure of the refrigerant outlet of the water heat exchanger 133. On the refrigerant outlet side, a first refrigerant on-off valve 134 opened during the heating operation and a second refrigerant on-off valve 135 opened during the cooling operation are provided in parallel, and the first refrigerant on-off valve 134 is connected to the four-way valve 1.
The second refrigerant on-off valve 135 is connected between the four-way valve 121 and the heat source side (outdoor) heat exchanger 12 between the heat exchanger 21 and the use side heat exchanger 122.
4 are connected to each other to form a heat pump type refrigerating apparatus.

[0004] During a heating operation for heating or hot water supply, a part of the high-pressure liquid refrigerant condensed in the use-side heat exchanger 122 by opening the bypass on-off valve 137 is sent to the water heat exchanger 133 of the engine 110 by the refrigerant pump 132. Thus, the water heat exchanger 133 heats and gasifies the refrigerant, and the high-temperature and high-pressure refrigerant is combined with the refrigerant discharged from the compressor 120 and sent to the use-side heat exchanger 122 again to increase the heating capacity. It is like that. Further, the flow rate of the cooling water flowing through the water heat exchanger 133 and the radiator 111 in the cooling water pipe is adjusted by the three-way valve 136 so that the waste heat recovery of the water heat exchanger 133 is kept good and the heating capacity is further improved. It was made. During the cooling (cooling) operation, a part of the high-pressure liquid refrigerant condensed in the heat source side heat exchanger 124 is removed by the refrigerant pump 13.
The radiator 111 for the engine cooling water is made small or unnecessary by sending the water to the water heat exchanger 133 of the engine 110 to cool the high-temperature engine cooling water in step 2, and the gas is exchanged with the engine cooling water for gasification. The obtained refrigerant is combined with the refrigerant discharged from the compressor 120 and condensed again in the water heat exchanger 133.

A water heat exchanger 13 for exchanging heat between a part of the high-pressure liquid refrigerant and the high-temperature cooling water of the engine 110 is provided to a heat pump type refrigeration system in which the compressor 120 is driven by the engine 110.
3, a dedicated water pipe for collecting exhaust heat of the engine 110 as a heat source for heating is not required, and the use-side heat exchanger 122 can heat the room strongly. The three-way valve 136 adjusts the flow rate of the cooling water to the water heat exchanger 133 and the radiator 111 based on the pressure at the refrigerant outlet of the water heat exchanger 133. Keep good heat recovery in 133
The heating capacity can be further improved. In addition, since the high-temperature cooling water of the engine 110 is cooled by the water heat exchanger 133 and the heat is radiated to the atmosphere by the heat source side heat exchanger 124 during cooling, the radiator 111 for cooling the engine cooling water has a small capacity. Or unnecessary,
The manufacturing cost can be reduced and the size of the device can be reduced.

As a second conventional example, Japanese Patent Application Laid-Open No.
FIG. 8 shows a gas heat pump refrigeration apparatus (air conditioner) disclosed in Japanese Patent No. 05174. Engine 2
10, the compressor 220, the four-way valve 221, the indoor heat exchangers 228 a, 228 b, 228 c, and the pressure reducing element 22.
7a, 227b, 227c and a refrigerant pipe formed by connecting the outdoor heat exchanger 222 with a refrigerant pipe;
A radiator 216 attached to the outdoor heat exchanger 222;
In a gas heat pump refrigeration apparatus including an auxiliary heat exchanger 213 for recovering exhaust heat of the engine 210 and a cooling water pipe formed by connecting a cooling water pump 214 with a cooling water pipe,
One end is connected to the high-pressure liquid pipe of the refrigerant pipe, and the other end is connected to a pipe extending from the four-way valve 221 to the indoor heat exchangers 228a, 228b, 228c. Pump 240 and bypass open / close valve 241
And an auxiliary heat exchanger 213, and a first cooling water on-off valve 212 in a cooling water pipe facing the auxiliary heat exchanger 213.
A second cooling water on-off valve 215 is provided in a cooling water pipe facing the radiator 216, and the first cooling water on-off valve 212
The first cooling water on / off valve 212 is closed and the second cooling water on / off valve 215 is opened when frost is formed on the outdoor heat exchanger 222 during the heating operation or during cooling.

During the heating operation, a part of the liquid refrigerant in the liquid pipe is supplied to the high-pressure gas pipe by the refrigerant pump 240 via the bypass valve 241, the auxiliary heat exchanger 213, and the refrigerant amount adjusting device 242, and the engine cooling water is supplied. During the heating, the cooling water brine (cooling water) flows through the discharge port of the cooling water pump 214, the engine 210, the water heat exchanger 211, the cooling water pipe, the auxiliary heat exchanger 213, and the suction port of the cooling water pump 214 in this order.
During heating defrosting and cooling, the cooling water brine is supplied to the discharge port of the cooling water pump 214, the engine 210, the water heat exchanger 211, the cooling water pipe, the outdoor heat exchanger 222, and the suction port of the cooling water pump 214. With the flow configuration, control is performed such that the bypass switching valve 241 and the first cooling water switching valve 212 are opened during heating, and the second cooling water switching valve 215 is opened during heating defrosting and cooling. Things.

[0008] A part of the liquid refrigerant in the liquid pipe is cooled by a refrigerant pump 240 through a bypass opening / closing valve 241, an auxiliary heat exchanger 213, and a refrigerant amount adjusting device 242 to a high-pressure gas pipe, and a cooling water brine. Opening / closing the outlet of the water pump 214, the engine 210, the water heat exchanger 211, the cooling water pipe, the outdoor heat exchanger 222, the cooling water pipe flowing to the suction port of the cooling water pump 214, and the second cooling water on / off valve 215. By providing a control device (not shown), the exhaust heat of the engine 210 is recovered at the time of heating, the liquid refrigerant pressurized by the refrigerant pump 240 is heat-exchanged by the auxiliary heat exchanger 213, and the compressor is connected by the high-pressure gas pipe. Merge with the high-pressure gas refrigerant discharged from 220, enter the indoor heat exchangers 228a, 228b, 228c, increase the cooled indoor heating capacity, and improve the heating coefficient of performance. Can. That is, the condensed liquid refrigerant is pressurized and heat-exchanged directly in the auxiliary heat exchanger 213 to recover the exhaust heat of the engine 210, and the indoor heat exchangers 228a and 228
8b and 228c, so that the exhaust heat of the engine at the time of heating is increased indirectly by the radiator built in the outdoor heat exchanger to increase the evaporation temperature of the refrigerant through the heat transfer of the plate fins. On the other hand, the ability is further increased. Moreover, the first cooling water on-off valve 212 of the cooling water pipe facing the auxiliary heat exchanger 213 and the radiator 21
6, the first cooling water on-off valve 212 is opened during the heating operation, and the first cooling water on-off valve 212 is opened when the outdoor heat exchanger 222 is frosted.
And the second cooling water on-off valve 215 is opened,
There is an effect that the heating operation can be performed even in the defrost mode.

[0009]

In the gas heat pump type refrigeration system disclosed in the above-mentioned first conventional example, when the load changes, the exhaust heat recovery in the auxiliary heat exchanger is kept good. However, since the engine water temperature is not controlled, the amount of heat exhausted from the engine is low, and the water temperature drops at low speeds and during warm-up, causing the engine oil to deteriorate at low temperatures. Deterioration leaves room for improvement. Further, the gas heat pump refrigeration apparatus disclosed in the second conventional example is excellent in that in the defrost mode, heat is transferred from the radiator to the outdoor heat exchanger through the plate fin to perform defrost, thereby performing a heating operation. However, during cooling operation, condensing temperature rises due to heat transfer from the radiator to the outdoor heat exchanger, and the cooling capacity decreases, so there is room for improvement.

The present invention has been made in view of the above circumstances, and provides an air conditioner that ensures an engine water temperature in an appropriate range and suppresses a decrease in performance during a heating operation in a defrost mode. With the goal.

[0011]

According to the first aspect of the present invention,
The compressor driven by the engine is connected to a refrigerant pipe of the indoor heat exchanger and the outdoor heat exchanger via a four-way valve, and one end is connected to a high-pressure liquid pipe of the refrigerant pipe and the four-way valve A refrigerant pump, a bypass on-off valve, and a water heat exchanger for recovering engine exhaust heat are provided in a bypass pipe having the other end connected to a pipe extending from the water heat exchanger to the indoor heat exchanger; And an air conditioner connected in parallel to a cooling water pipe of the engine, wherein an engine water temperature sensor for detecting a temperature of cooling water of the engine is provided in a cooling water pipe in the engine.
The cooling water pipe on the engine outlet side is provided with a water amount control valve connected to the cooling water inlet side of the water heat exchanger, and the water amount control valve is proportionally controlled by an output from the engine water temperature sensor so that the water amount is controlled. The amount of cooling water introduced into the heat exchanger is controlled.

With such a configuration, the opening of the water amount control valve can be controlled in accordance with the water temperature of the engine, and the amount of cooling water introduced into the water heat exchanger and the radiator can be controlled. Therefore, according to the water temperature of the engine, it is possible to appropriately select the use of the engine exhaust heat for raising the temperature of the engine itself, the use of the heat as a heating heat source, or the release of heat from a radiator.

According to a second aspect of the present invention, a compressor driven by an engine is connected to a refrigerant pipe of an indoor heat exchanger and an outdoor heat exchanger via a four-way valve, and a high-pressure liquid of the refrigerant pipe is connected to the compressor. A refrigerant pump, a bypass on-off valve, and a water heat exchanger for recovering engine exhaust heat are connected to a bypass pipe having one end connected to a pipe and the other end connected to a pipe extending from the four-way valve to the indoor heat exchanger. In the air conditioner in which the water heat exchanger and the radiator are connected in parallel to the cooling water pipe of the engine, the refrigerant pipe at the outlet of the water heat exchanger is branched into two, and one of them is provided. Is connected to the indoor heat exchanger by a first on-off valve,
The other is connected to the refrigerant inlet side of the outdoor heat exchanger by a second on-off valve.

With such a configuration, in a system in which the outdoor heat exchanger and the radiator are not connected by plate fins in order to improve the performance of the cooling operation, the engine passing through the water heat exchanger in the defrosting mode is used. The refrigerant heated by the exhaust heat is introduced into the outdoor heat exchanger, so that the outdoor heat exchanger can be defrosted. At the same time, the refrigerant from the compressor can be introduced into the indoor heat exchanger to perform the heating operation.

According to a third aspect of the invention, a compressor driven by an engine is connected to a refrigerant pipe of an indoor heat exchanger and an outdoor heat exchanger via a four-way valve, and a high-pressure liquid in the refrigerant pipe is connected to the compressor. A refrigerant pump, a bypass on-off valve, and a water heat exchanger for recovering engine exhaust heat are connected to a bypass pipe having one end connected to a pipe and the other end connected to a pipe extending from the four-way valve to the indoor heat exchanger. In the air conditioner in which the water heat exchanger and the radiator are connected in parallel to the cooling water pipe of the engine, one end is connected between the outdoor heat exchanger and the receiver, and the four-way valve is A defrosting pipeline having the other end connected to the four-way valve side from a connection of the bypass pipeline of the pipeline leading to the indoor side heat exchanger is provided, and a defrosting on-off valve is provided in the defrosting pipeline. It is characterized by having.

With such a configuration, in a system in which the outdoor heat exchanger and the radiator are not connected by plate fins in order to improve the performance of the cooling operation, the compressor is heated to a high pressure and a high temperature in the defrosting mode. The introduced refrigerant can be introduced into the outdoor heat exchanger to defrost the outdoor heat exchanger. At the same time, the heating operation can be performed by simultaneously transferring the refrigerant that has passed through the water heat exchanger by the refrigerant pump and is heated by the exhaust heat of the engine to the indoor heat exchanger.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to third embodiments of the air conditioner according to the present invention will be described with reference to FIGS.

[First Embodiment] A first embodiment of an air conditioner according to the present invention will be described with reference to FIGS. In the present embodiment, only portions different from the heat pump refrigeration apparatus shown as the first conventional example will be described, and the same components will be denoted by the same reference numerals and detailed description thereof will be omitted. The difference is that an engine water temperature sensor, a first water flow control valve, and a second water flow control valve are provided in the cooling water pipe.

The first water quantity control valve 10 is a three-way valve, and is connected to the water heat exchanger 133 through a cooling water pipe of the engine 110.
One end is connected to the outlet side, the other end is connected to the inlet side of the cooling water pump 112, and the other end is connected to the inlet side of the second water quantity control valve 20. The second water flow control valve 20 is a three-way valve, and the first water flow control valve 1
One end is connected to the outlet side of the water heat exchanger 133, the other end is connected to the inlet side of the water heat exchanger 133, and the other end is connected to the radiator 111.
The engine water temperature sensor 30 is installed in a cooling water pipe in the engine 110.

When a plurality of indoor units are operated by one outdoor unit as in this air conditioner, that is, an air conditioner in which a plurality of indoor heat exchangers are connected to one outdoor heat exchanger. When operating, determine the number of rotations of the compressor based on the operating model and number of indoor units, and further correct the number of rotations of the compressor based on the difference between the required temperature of the indoor remote controller and the intake air temperature of the indoor unit to heat The ability is appropriate. Engine 110
When the water temperature of the engine 110 is as low as 60 degrees or less, such as when the engine is warmed up or when the outside air temperature is low, the entire amount of engine cooling water is controlled by the first water amount control valve 10 to the cooling water pump 112, the engine 110, and the first Control valve 10 and cooling water pump 1
Circulate with 12. The heat source for heating is the outdoor air heat exchanger 1
Heat is absorbed from the air of the engine 24 and the exhaust heat of the engine 110 is used to raise the temperature of the engine 110 itself. When the water temperature of the engine 110 rises and is higher than 60 degrees and equal to or lower than 65 degrees, a part of the engine cooling water branched by the first water amount control valve 10 is supplied to the cooling water pump 112 and the engine 1.
10, the first water flow control valve 10, and the cooling water pump 112
The remaining engine cooling water branched from the first water flow control valve 10 enters the second water flow control valve 20 and returns to the cooling water pump 112 through the water heat exchanger 133.
The heat source of the heating becomes a part of the heat absorption from the air and the exhaust heat of the engine 110, and the remainder of the exhaust heat of the engine 110 is used to raise the temperature of the engine 110 itself. Further engine 110
When the water temperature rises and is higher than 65 degrees and equal to or lower than 80 degrees, the total amount of engine cooling water is reduced by the first water amount control valve 10 to the cooling water pump 112, the engine 110, the first water amount control valve 10, and the second water amount. It circulates with the control valve 20, the water heat exchanger 133, and the cooling water pump 112. Heat sources for heating are heat absorption from the air and exhaust heat of the engine 110, and the engine 11
The entire amount of waste heat of 0 is used for heating. Further engine 11
When the water temperature of 0 is higher than 80 degrees and lower than 95 degrees, a part of the cooling water of the engine 110 branched by the second water quantity control valve 20 enters the radiator 111 and radiates heat. That is, the entire amount of the cooling water of the engine 110 circulates through the cooling water pump 112, the engine 110, the first water amount control valve 10, the second water amount control valve 20, the water heat exchanger 133, and the cooling water pump 112, and Part of the cooling water of the engine 110 branched by the water amount control valve 20 enters the water heat exchanger 133 and recovers exhaust heat. The remaining cooling water of engine 110 enters radiator 111 and is radiated. Thereafter, these engine cooling waters merge and return to the cooling water pump 112. A part of the exhaust heat of the engine 110 is used for heating, and the rest is radiated to the atmosphere. Further, the engine water temperature rose 95
When the temperature is higher than the temperature, the cooling water of the engine 110 that has passed through the second water flow control valve 20 enters the radiator 111,
No engine cooling water enters the water heat exchanger 133, and the exhaust heat of the engine 110 is not used for heating.

Since the temperature expansion of the piston and cylinder of the engine 110 is designed between 60 ° C. and 100 ° C., if the temperature is outside the range, abnormal wear of the cylinder or the like occurs. If the temperature of the engine cooling water is low, the drain of the engine blow-by gas is mixed into the engine oil to cause oil deterioration. If the temperature of the engine cooling water is too high, the oxidation of the engine oil proceeds and the deterioration is accelerated. In the air-conditioning apparatus according to the present embodiment, when the engine cooling water temperature is low, the exhaust heat recovery is not performed until the water temperature rises to a predetermined temperature, so that the operation time when the engine 110 water temperature is low is shortened, and When the temperature of the cooling water of the engine 110 rises, heat is radiated by the radiator 111 and the water temperature does not rise above a predetermined value. Therefore, abnormal wear of the engine 110 and early deterioration of the engine oil are eliminated, and the life of the engine 110 can be extended.

In the above embodiment, the refrigerant pump 132 is provided as a liquid pump on the inlet side of the water heat exchanger 133. However, the present invention is not limited to this. For example, as shown in FIG. A gas pump may be provided on the outlet side of the water heat exchanger 133.

[Second Embodiment] A second embodiment of the air conditioner according to the present invention will be described with reference to FIGS. In the present embodiment, only the portions different from the heat pump type refrigeration apparatus shown as the second conventional example will be described, and the same components will be denoted by the same reference numerals and detailed description thereof will be omitted. The difference is that the refrigerant pipe on the outlet side of the water heat exchanger is branched into two,
This is a point that an on-off valve and a second on-off valve are provided.

The first on-off valve 40 has one end on the refrigerant outlet side of the water heat exchanger 213 branched into two, and the indoor heat exchanger 22.
The other end is connected to the entrance side of 8a, 228b, 228c. The second on-off valve 50 has one end connected to the refrigerant outlet side branched into two of the water heat exchanger 213 and the other end connected to the inlet side of the outdoor heat exchanger 222 during the heating operation.

In this air conditioner, the first on-off valve 40 is closed and the second on-off valve 50
Is opened, the high-pressure refrigerant of the water heat exchanger 213 heated by the exhaust heat of the engine 210 enters the outdoor heat exchanger 222, and the heat defrosts the outdoor heat exchanger 222. At this time, the refrigerant exiting the compressor 220 is supplied to the indoor heat exchanger 228
The normal heating operation is performed at a, 228b, and 228c. During the heating operation, the first on-off valve 40 is opened and the second on-off valve 50 is closed, so that the exhaust heat of the engine 210 can be used for heating. During the cooling operation, both the first on-off valve 40 and the second on-off valve 50 are closed, so that the operation is the same as the normal operation.

In the air conditioner according to the present embodiment, the heating operation can be performed even in the defrost mode, and the performance during the cooling operation can be prevented from being affected.

In the above embodiment, the refrigerant pump 240 is provided as a liquid pump on the inlet side of the water heat exchanger 213. However, the present invention is not limited to this. For example, as shown in FIG. A gas pump may be provided on the outlet side of the water heat exchanger 213.

Third Embodiment An air conditioner according to a third embodiment of the present invention will be described with reference to FIGS. In the present embodiment, only the portions different from the heat pump type refrigeration apparatus shown as the second conventional example will be described, and the same components will be denoted by the same reference numerals and detailed description thereof will be omitted. The difference is that a defrosting pipeline and a defrosting on-off valve are provided.

The third on-off valve 60 has one end connected to the refrigerant outlet side of the outdoor heat exchanger 222 during the cooling operation and the other end connected to the receiver tank (receiver) 223 side. The fourth on-off valve (defrosting on-off valve) 70 has one end on the outdoor heat exchanger 222 side of the third on-off valve 60 and the indoor heat exchanger 22.
The other end is connected between 8a, 228b, 228c and the four-way valve 221. The fifth on-off valve 80 is a pipe line between the indoor heat exchangers 228 a, 228 b, 228 c and the four-way valve 221, and is connected from one end of the fourth on-off valve 70 to the indoor heat exchanger 228.
a, 228b, 228c.

In the heating defrosting mode, the third on-off valve 60,
Since the fifth on-off valve 80 is closed, the fourth on-off valve 70 is open, and the four-way valve 221 is in the cooling operation position, the compressor 2
The high-pressure refrigerant that has exited 20 is a four-way valve 221, an outdoor heat exchanger 2
22, the fourth on-off valve 70, the four-way valve 221 and the compressor 2
Returning to 20, the outdoor heat exchanger 222 is defrosted. The refrigerant pump 240 sends the high-pressure refrigerant heated by the exhaust heat of the engine 210 by the water heat exchanger 213 to the indoor heat exchangers 228a, 228b, 228c, and heats the room with the heat. During the heating operation, the third on-off valve 60 and the fifth on-off valve 80 are opened, the fourth on-off valve 70 is closed, and the four-way valve 221 is returned to the heating position.
Zero waste heat can be used for heating. During the cooling operation, the third opening / closing valve 60 and the fifth opening / closing valve 80 are opened, the fourth opening / closing valve 70 is closed, and the four-way valve 221 is set to the cooling position, which is the same as the normal operation.

In the air conditioner according to this embodiment, the heating operation can be performed even in the defrost mode, and the performance during the cooling operation can be prevented from being affected.

In the above embodiment, the refrigerant pump 240 is provided as a liquid pump on the inlet side of the water heat exchanger 213. However, the present invention is not limited to this. For example, as shown in FIG. A gas pump may be provided on the outlet side of the water heat exchanger 213.

[0033]

As described above, the air conditioner according to the present invention has the following effects. That is, according to the air conditioner of the first aspect, when the engine coolant temperature is low, the exhaust heat recovery is not performed until the coolant temperature rises to a predetermined temperature, so that the operation time when the engine coolant temperature is low is shortened. be able to. In addition, when the temperature of the engine cooling water increases, heat can be radiated by the radiator to prevent the water temperature from rising above a predetermined value. In general, pistons and cylinders of engines have a temperature expansion of 60 degrees to 1 degree.
Since the temperature is designed between 00 degrees, abnormal wear of the cylinder occurs when the temperature is out of the range. If the temperature of the engine cooling water is low, the drain of the engine blow-by gas mixes into the engine oil, causing oil deterioration. Conversely, if the temperature of the engine cooling water is too high, the oxidation of the engine oil proceeds and the deterioration is accelerated. Therefore, according to the present invention, abnormal wear of the engine and early deterioration of the engine oil can be eliminated, and the life of the engine can be extended. According to the air conditioner of the second aspect, the heating operation can be performed even in the defrost mode, and the performance during the cooling operation can be prevented from being affected. Furthermore, according to the air conditioner of the third aspect, the heating operation can be performed even in the defrost mode, and the performance during the cooling operation can be prevented from being affected.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an example of a first embodiment of an air conditioner according to the present invention.

FIG. 2 is a schematic configuration diagram illustrating an example of a second embodiment of an air conditioner according to the present invention.

FIG. 3 is a schematic configuration diagram illustrating an example of a third embodiment of the air-conditioning apparatus according to the present invention.

FIG. 4 is a schematic configuration diagram showing another example of the first embodiment of the air-conditioning apparatus according to the present invention.

FIG. 5 is a schematic configuration diagram showing another example of the second embodiment of the air-conditioning apparatus according to the present invention.

FIG. 6 is a schematic configuration diagram showing another example of the third embodiment of the air-conditioning apparatus according to the present invention.

FIG. 7 is a schematic configuration diagram of a gas heat pump refrigeration apparatus shown as a first conventional example.

FIG. 8 is a schematic configuration diagram of a gas heat pump refrigeration apparatus shown as a second conventional example.

[Explanation of symbols]

Reference Signs List 10 first water amount control valve 20 second water amount control valve 30 engine water temperature sensor 40 first on-off valve 50 second on-off valve 60 third on-off valve 70 fourth on-off valve (defrosting on-off valve) 80 fifth on-off valve 110 210 engine 111, 216 radiator 112, 214 cooling water pump 120, 220 compressor 121, 221 four-way valve 122, 228a, 228b, 228c indoor side (use side) heat exchanger 124, 222 outdoor side (heat source side) heat exchanger 132,240 Refrigerant pump 133,213 Water heat exchanger 137,241 Bypass on-off valve 223 Receiver tank (receiver)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeki Ozeki 1 Nagoya Research Laboratories, Mitsubishi Heavy Industries, Ltd. 3-1-1, Mitsubishi Heavy Industries, Ltd. Air Conditioner Works (72) Inventor Takeshi Yokoyama 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Inventor Yutaka Yoshida 1-5-5 Kaigan, Minato-ku, Tokyo 20 Tokyo Gas Co., Ltd. (72) Inventor Taku Nakamura 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd.

Claims (3)

[Claims] 1. A compressor driven by an engine is connected to a refrigerant pipe of an indoor heat exchanger and an outdoor heat exchanger via a four-way valve, and one end is connected to a high-pressure liquid pipe of the refrigerant pipe. A refrigerant pump, a bypass on-off valve, and a water heat exchanger for recovering engine exhaust heat are provided in a bypass pipe having the other end connected to a pipe from the four-way valve to the indoor heat exchanger; In an air conditioner in which a heat exchanger and a radiator are connected in parallel to a cooling water pipe of the engine, an engine water temperature sensor for detecting a cooling water temperature of the engine is provided in a cooling water pipe in the engine, and the engine outlet side is provided. The cooling water pipe is provided with a water amount control valve connected to the cooling water inlet side of the water heat exchanger, and the water amount control valve is proportionally controlled by an output from the engine water temperature sensor, so that the water heat exchanger is Controls the amount of cooling water introduced An air conditioning apparatus characterized in that it is. 2. A compressor driven by an engine is connected to a refrigerant pipe of an indoor heat exchanger and an outdoor heat exchanger via a four-way valve, and one end is connected to a high-pressure liquid pipe of the refrigerant pipe. A refrigerant pump, a bypass on-off valve, and a water heat exchanger for recovering engine exhaust heat are provided in a bypass pipe having the other end connected to a pipe from the four-way valve to the indoor heat exchanger; In an air conditioner in which a heat exchanger and a radiator are connected in parallel to a cooling water pipe of the engine, the refrigerant pipe on the outlet side of the water heat exchanger is branched into two, one of which is a first on-off valve. The air conditioner is connected to the indoor heat exchanger, the other of which is connected to a refrigerant inlet side of the outdoor heat exchanger by a second on-off valve. 3. A compressor driven by an engine is connected to a refrigerant pipe of an indoor heat exchanger and an outdoor heat exchanger via a four-way valve, and one end is connected to a high-pressure liquid pipe of the refrigerant pipe. A refrigerant pump, a bypass on-off valve, and a water heat exchanger for recovering engine exhaust heat are provided in a bypass pipe having the other end connected to a pipe from the four-way valve to the indoor heat exchanger; In an air conditioner in which a heat exchanger and a radiator are connected in parallel to a cooling water pipe of the engine, one end is connected between the outdoor heat exchanger and a receiver, and the indoor heat exchanger is connected from the four-way valve. A defrosting pipe line having the other end connected to the four-way valve side of the connection section of the bypass pipe line to the pipeline, and a defrosting on-off valve provided in the defrosting pipe line. Air conditioner.