JPH08219584A - Engine driven type air conditioning equipment - Google Patents

Abstract

PURPOSE: To shorten the time required for the start of an air conditioning equipment by shortening warmup operation time of an engine at the start of operating the air conditioning equipment. CONSTITUTION: A heater 23 is provided in a circulation circuit 27 of cooling water to an engine 1 while a bypass circuit 20 to let the cooling water be bypassed to a radiator 12. When the temperature of the cooling water falls below a specified value during the stoppage of the operation of the engine 1, a bypass valve 21 is opened and a cooling water circulation pump 13 is operated to circulate the cooling water via the heater 23, the engine 1 and the bypass circuit 20. Thus, the cooling water is heated by the heater 23 to be maintained above a specified temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven air conditioner having a compressor driven by a water-cooled engine.

[0002]

2. Description of the Related Art An example of a conventional air conditioner of this type is shown in FIG. When the compressor 2 is driven by the water-cooled engine 1 during the cooling operation, the gas refrigerant discharged from the compressor 2 enters the outdoor heat exchanger 4 via the four-way valve 3 as shown by the solid arrow. Here, heat is radiated to the outside air blown by the outdoor fan 5 to be condensed and liquefied.

This liquid refrigerant passes through a check valve 6 and a throttle 7 for cooling.
After being adiabatically expanded in the process of flowing through, the air enters the indoor heat exchanger 8 where the indoor air blown by the indoor fan 9 is cooled to be evaporated and vaporized. Then, the gas refrigerant returns to the compressor 2 via the four-way valve 3.

During the heating operation, the refrigerant discharged from the compressor 2 has a four-way valve 3, an indoor heat exchanger 8, a check valve 11, a heating throttle 10, an outdoor heat exchanger 4, and a four-way valve, as indicated by broken line arrows. It returns to the compressor 2 through the valve 3 in this order.

The cooling water of the engine 1 circulates through a cooling water circulation circuit 27, and the cooling water heated by cooling the engine 1 enters a radiator 12 where it radiates heat to the outside air blown by an outdoor fan 5. After the temperature is lowered, it returns to the engine 1 via the cooling water circulation pump 13.

[0006]

In the conventional air conditioner described above, the rotation speed of the compressor 2 is controlled by controlling the rotation speed of the engine 1. The engine 1 has a predetermined operating temperature (for example,
Since it is designed to exhibit the desired performance at (90 ° C), warm-up operation is performed until the temperature of the engine 1 rises from the ambient temperature to a predetermined temperature when the operation is started.

However, during this warm-up operation, the rotation speed of the engine 1 cannot be controlled, and therefore the rotation speed required for the compressor 2 cannot be adjusted, so that it takes time for the air conditioner to start up. There was a problem.

[0008]

The present invention has been invented to solve the above-mentioned problems, and the gist of the first invention is to be driven by a water-cooled engine that radiates heat through a radiator. In an engine-driven air conditioner having a refrigeration cycle including a compressor, an outdoor heat exchanger, a throttle, an indoor heat exchanger, etc., a cooling water circulation pump and a heater in a cooling water circulation circuit for the engine. And a bypass circuit for bypassing the cooling water to the radiator is provided, and when the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, the cooling water circulation pump is operated to cool the cooling water. The cooling water is heated by the heater to maintain it at a predetermined temperature or higher by circulating it through the heater, engine and bypass circuit. In which an engine driving type air conditioner.

The heater may be a gas combustion heater.

The heater can be composed of an electric heater.

The gist of the second invention is a refrigeration cycle constituted by a compressor driven by a water-cooled engine that radiates heat via a radiator, an outdoor heat exchanger, a throttle, an indoor heat exchanger and the like. In an engine-driven air conditioner provided with, a cooling water circulation pump and a heat storage tank for storing heat by circulation of cooling water are provided in a cooling water circulation circuit for the engine, and a bypass circuit for bypassing the cooling water to the radiator is provided. It is an engine-driven air conditioner characterized by being provided.

Another feature of the second invention is that when the temperature of the heat storage tank falls below a predetermined temperature while the operation of the engine is stopped, the engine is operated to supply cooling water to the engine. The heat storage tank and the bypass circuit are circulated to keep the heat storage tank at a predetermined temperature or higher.

Another feature of the second invention is that when the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, the cooling water circulation pump is operated to supply a predetermined amount of the cooling water. The cooling water is maintained at a predetermined temperature or higher by circulating the cooling water through the engine, the heat storage tank and the bypass circuit to heat the cooling water with the heat stored in the heat storage tank.

The gist of the third invention is that it is constituted by a compressor driven by a water-cooled engine that radiates heat via a radiator, a four-way valve, an outdoor heat exchanger, a throttle, an indoor heat exchanger and the like. In an engine-driven air conditioner equipped with a heat pump cycle, a heat storage tank for storing heat by circulation of cooling water is provided in a cooling water circulation circuit for the engine, and a bypass circuit for bypassing the cooling water to the radiator is provided. An opening / closing valve is provided in the refrigerant pipe connecting the outdoor heat exchanger and the four-way valve, and an endothermic pipe passing through the heat storage tank is provided in parallel with the opening / closing valve, and the bypass valve is provided in the bypass circuit. It is an engine-driven air conditioner characterized in that

Still another feature of the third invention is that during normal cooling / heating operation, the opening / closing valve is opened to circulate the refrigerant through the refrigerant pipe and the opening / closing valve, and at the same time, the heat storage tank is circulated by cooling water. When the temperature of the cooling water drops below a predetermined temperature during the cooling operation, the bypass valve is controlled to reduce the amount of heat radiation in the radiator and the refrigerant is flowed to the heat absorbing pipe according to the temperature of the cooling water. This is to heat the cooling water in the heat storage tank, and to flow the refrigerant through the heat absorption pipe to absorb heat from the heat storage tank when the capacity decreases during the heating operation.

[0016]

According to the first aspect of the present invention, when the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, the cooling water circulation pump is operated to cool the cooling water discharged from the heater, the engine, and By circulating the water through the bypass circuit, the cooling water is heated by the heater to maintain its temperature above a predetermined temperature.

In the inventions according to claims 4 and 5, when the temperature of the heat storage tank falls below a predetermined temperature while the operation of the engine is stopped, the engine is operated and the high temperature cooling water flowing out from the engine is stored in the heat storage tank. The heat storage tank is maintained at a predetermined temperature or higher by circulating the heat storage tank through the bypass circuit.

In the inventions of claims 4 and 6, when the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, the cooling water circulation pump is operated to supply a predetermined amount of the cooling water discharged from the pump. The cooling water is maintained at a predetermined temperature or higher by circulating it through the engine, the heat storage tank and the bypass circuit and heating the cooling water with the heat stored in the heat storage tank.

According to the seventh and eighth aspects of the present invention, during normal cooling / heating operation, the opening / closing valve is opened to circulate the refrigerant through the refrigerant pipe and the opening / closing valve, and the high temperature cooling water flowing out from the engine is stored in the heat storage tank and The heat is stored in the heat storage tank by circulating it through the radiator. When the temperature of the cooling water drops below a predetermined temperature during cooling operation, the refrigerant flows through the heat absorption pipes according to the temperature of the cooling water to heat the cooling water in the heat storage tank and at the same time control the bypass valve to increase the amount of water passing through the radiator. By doing so, the heat radiation amount of the radiator is reduced. When the heating capacity is lowered during the heating operation, the heating capacity is increased by causing the refrigerant to flow through the heat absorption pipe to absorb heat in the heat storage tank.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. A compressor 2 driven by the engine 1, a four-way valve 3, an outdoor heat exchanger 4, throttles 7 and 10, check valves 6 and 11, an indoor heat exchanger 8 and the like constitute a heat pump cycle.

The cooling water of the engine 1 is cooled by the radiator 12, and then returns to the engine 1 through the cooling water circulation pump 13. In addition, 5 is an outdoor fan, 9 is an indoor fan, and 27 is a cooling water circulation circuit. The above is the same as the conventional one shown in FIG.

In the cooling water circulation circuit that connects the cooling water circulation pump 13 and the engine 1, a heater 23 composed of a gas combustor is provided. An electric heater may be used instead of the gas combustor. Then, a bypass circuit 20 for bypassing the cooling water to the radiator 12 is provided, and a bypass valve 21 is interposed in this bypass circuit 20.

A temperature sensor 22 for detecting the temperature of the cooling water flowing out from the engine 1 is provided, and the temperature detected by this sensor 22 is input to the controller 28. The controller 28 outputs to the bypass valve 21, the cooling water circulation pump 13, and the valve 25 provided in the gas supply pipe 26 of the gas combustor 23 to control them.

When the temperature of the cooling water detected by the sensor 22 falls below a predetermined temperature while the engine 1 is stopped, the controller 28 outputs the bypass valve 21 to fully open it and at the same time circulates the cooling water. The gas is sent to the gas combustor 23 and burned by outputting it to the pump 13 to start it and outputting it to the valve 25 to open it.

Then, a predetermined amount of cooling water discharged from the cooling water circulation pump 13 is heated by the gas combustor 23, and then circulates to the cooling water circulation pump 13 via the engine 1 and the bypass circuit 20. As a result, when the temperature of the cooling water rises above the predetermined temperature, the bypass valve 21 and the valve 25 are closed and the cooling water circulation pump 13 is stopped by the command from the controller 28. By repeating the above, the temperature of the cooling water is maintained at a predetermined temperature or higher while the engine 1 is stopped.

Thus, since the temperature of the cooling water is maintained at the predetermined temperature or higher at the start of the operation of the air conditioner, when the engine 1 is started, the temperature of the engine 1 quickly rises to the predetermined operating temperature. Therefore, the warm-up operation time is short, and the normal operation of the air conditioner can be swiftly changed.

A second embodiment of the invention is shown in FIG. In the second embodiment, a heat storage tank 29 is provided in a cooling water circulation circuit 27 from the engine 1 to the radiator 12, and a heat storage agent 32 and a temperature sensor 33 for detecting this temperature are provided in the heat storage tank 29. It is arranged. This temperature sensor
The detected value of 33 is input to the controller 35 and
35 outputs to the engine 1 and the bypass valve 21 to control them. The same members as those in the first embodiment shown in FIG. 1 are designated by the same reference numerals.

When the temperature of the heat storage tank 29 falls below a predetermined temperature while the operation of the engine 1 is stopped, the bypass valve 21 is fully opened at the same time when the engine 1 is operated so that the total amount of the cooling water flowing out from the engine 1 is reduced. The temperature of the heat storage tank 29 is maintained at a predetermined temperature or higher by circulating the heat storage tank 29, the bypass circuit 20, and the circulation pump 13 to the engine 1.

When the operation of the air conditioner is started, the bypass valve 21 is fully closed, and after the entire amount of the cooling water flowing out from the engine 1 is heated by the heat storage agent 32 in the process of flowing through the heat storage tank 29, It circulates to the engine 1 through the bypass circuit 20 and the cooling water circulation pump 13. Therefore, the cooling water is
Since it is heated by flowing through the heat storage tank 29 maintained at a predetermined temperature or higher, the temperature of the engine 1 and the cooling water can be quickly raised to a predetermined operating temperature. . As a result, the warming-up operation is completed in a short time, so that the normal cooling / heating operation can be immediately changed.

After shifting to the normal cooling / heating operation, the amount of water flowing through the bypass circuit 20 by opening and closing the bypass valve 21, that is, the amount of water flowing through the radiator 12 is adjusted to reduce the heat radiation amount of the radiator. The temperature of the cooling water is adjusted to maintain a predetermined operating temperature. Then, the heat storage agent 32 in the heat storage tank 29 is heated by the cooling water flowing through the heat storage tank 29.

A third embodiment of the invention is shown in FIG. In the third embodiment, the cooling water circulation pump 13
Is driven via an inverter 30.
Then, a temperature sensor 22 for detecting the temperature of the cooling water flowing out from the engine 1 is provided, and the detection value of the temperature sensor 22 is input to the controller 31, which outputs it to the bypass valve 21 and the inverter 30. It is designed to be controlled. The same members as those in the second embodiment shown in FIG. 2 are designated by the same reference numerals.

During operation of the engine 1, the high temperature cooling water flowing out of the engine 1 heats the heat storage agent 32 in the process of flowing through the heat storage tank 29 to store heat therein.
The cooling water flowing out from the heat storage tank 29 radiates heat in the radiator 12, and then returns to the engine 1 via the cooling water circulation pump 13.

When the temperature of the cooling water detected by the temperature sensor 22 drops below a predetermined temperature while the engine 1 is stopped, the controller 31 outputs it to the bypass valve 21 to fully open it and to the inverter 30 at the same time. Then, the cooling water circulation pump 13 is rotated at a predetermined rotation speed.

Then, a predetermined amount of cooling water discharged from the cooling water circulation pump 13 enters the heat storage tank 29 through the engine 1,
Here, after absorbing heat from the heat storage agent 32 and raising the temperature, the bypass circuit
It circulates to the cooling water circulation pump 13 via 20. As a result, when the temperature of the cooling water rises and reaches the predetermined temperature or higher, the bypass valve 21 is closed by a command from the controller 28, and the cooling water circulation pump 13 is stopped. By repeating the above, the temperature of the cooling water during the stop of the engine 1 is maintained at a predetermined temperature or higher.

Thus, since the temperature of the cooling water is maintained at the predetermined temperature or higher at the start of the operation of the air conditioner, the temperature of the engine 1 quickly rises to the predetermined operating temperature when the engine is started. Therefore, the warm-up operation time becomes shorter,
Can quickly shift to normal operation.

A fourth embodiment of the invention is shown in FIG. In the fourth embodiment, an on-off valve 38 is provided in a refrigerant circuit 39 that connects the outdoor heat exchanger 4 and the four-way valve 3, and an endothermic pipe 36 is provided in parallel with the on-off valve 38. A heat transfer pipe 37 interposed in the pipe 36 is incorporated in the heat storage tank 29.

The detected value of the temperature sensor 33 provided in the heat storage tank 29 is input to the controller 40, and the controller 40
Outputs to the engine 1, the bypass valve 21, and the opening / closing valve 38 to control them. The other structure is the same as that of the second embodiment shown in FIG. 2, and corresponding members are designated by the same reference numerals and the description thereof is omitted.

On the other hand, the opening / closing valve during normal cooling / heating operation
Since 38 is opened, the refrigerant circulates through the refrigerant circuit 39 and the on-off valve 38. Since the bypass valve 21 is closed, the high temperature cooling water flowing out from the engine 1 is stored in the heat storage tank 29,
The heat is circulated through the radiator 12 and the cooling water circulation pump 13, and heat is stored in the heat storage tank 29 in this process.

When the temperature of the cooling water drops below a predetermined temperature during the cooling operation, the opening of the on-off valve 38 is controlled in accordance with this temperature to allow the refrigerant to flow through the heat absorption pipe 36 and the heat transfer coil 37 to store heat. The cooling water is heated in the tank 29. At the same time, the opening amount of the bypass valve 21 is controlled to reduce the amount of cooling water bypassed through the bypass circuit 20 and increase the amount of water passing through the radiator 12, thereby reducing the heat radiation amount of the radiator 12.

Thus, the cooling water is heated in the heat storage tank 29,
And since the amount of heat dissipated in the radiator 12 is reduced,
Immediately rises to the specified operating temperature.

When the heating capacity decreases during heating operation,
The opening / closing valve 38 is closed to allow the refrigerant to flow through the heat absorption pipe 36 and the heat transfer coil 37 to absorb heat in the heat storage tank 29, thereby increasing the heating capacity.

[0042]

According to the first aspect of the invention, when the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, the cooling water circulation pump is operated to heat the cooling water by a heater.
Since the temperature of the cooling water is maintained above the predetermined temperature by circulating it through the engine and the bypass circuit, the warm-up time of the engine is shortened at the start of the operation of the air conditioner,
Therefore, the start-up time of the air conditioner can be shortened and the normal cooling / heating operation can be promptly started.

According to the fourth and fifth aspects of the invention, when the temperature of the heat storage tank is stopped below a predetermined temperature while the operation of the engine is stopped, the engine is operated to circulate the cooling water through the heat storage tank and the bypass circuit. As a result, the heat storage tank is maintained at a predetermined temperature or higher, so that the warm-up time of the engine can be shortened.

According to the fourth and sixth aspects of the invention, when the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, the cooling water circulation pump is operated to supply a predetermined amount of cooling water to the engine and the heat storage tank. Also, since the cooling water is heated by the heat stored in the heat storage tank by circulating through the bypass circuit and is maintained at a predetermined temperature or higher, the warm-up time of the engine can be shortened and the exhaust of the engine stored in the heat storage tank can be shortened. Since the cooling water can be heated by utilizing the heat, it is possible to contribute to energy saving.

In the seventh and eighth aspects of the invention, during normal cooling / heating operation, the on-off valve is opened to circulate the refrigerant through the refrigerant pipe, and the high temperature cooling water flowing out from the engine is passed through the heat storage tank and the radiator. Since the heat can be stored in the heat storage tank by circulating it, the warm-up operation time at the start of operation of the air conditioner can be shortened. When the temperature of the cooling water drops below a predetermined temperature during cooling operation, the refrigerant flows through the heat absorption pipes according to the temperature of the cooling water to heat the cooling water in the heat storage tank and at the same time control the bypass valve to increase the amount of water passing through the radiator. By doing so, the amount of heat dissipated by the radiator is reduced, so that the temperature of the cooling water can be quickly raised to a predetermined operating temperature. When the heating capacity is lowered during the heating operation, the heating capacity can be increased by causing the refrigerant to flow through the heat absorption pipe to absorb heat in the heat storage tank.

[Brief description of drawings]

FIG. 1 is a system diagram showing a first embodiment of the present invention.

FIG. 2 is a system diagram showing a second embodiment of the present invention.

FIG. 3 is a system diagram showing a third embodiment of the present invention.

FIG. 4 is a system diagram showing a fourth embodiment of the present invention.

FIG. 5 is a system diagram of a conventional engine-driven air conditioner.

[Explanation of symbols]

 12 radiator 1 engine 2 compressor 4 outdoor heat exchanger 7, 10 throttle 8 indoor heat exchanger 27 cooling water circulation circuit 13 cooling water circulation pump 23 heater 20 bypass circuit 21 bypass valve 22 temperature sensor 28 controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Hanai No. 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Michio Yoneda No. 1 Takamichi, Iwatsuka-machi, Nakamura-ku, Nagoya (72) Inventor Tadahiro Kato, Asahi-cho 3-chome, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd.

Claims (8)

[Claims] 1. An engine-driven air conditioner having a refrigeration cycle including a compressor driven by a water-cooled engine that radiates heat via a radiator, an outdoor heat exchanger, a throttle, an indoor heat exchanger, etc. A cooling water circulation pump and a heater are provided in a cooling water circulation circuit for the engine, and a bypass circuit for bypassing the cooling water to the radiator is provided, and the temperature of the cooling water is equal to or lower than a predetermined temperature while the engine is stopped. When the temperature drops to, the cooling water circulation pump is operated to circulate the cooling water through the heater, the engine and the bypass circuit to heat the cooling water by the heater to maintain the temperature at or above a predetermined temperature. Engine driven air conditioner. 2. The engine-driven air conditioner according to claim 1, wherein the heater is a gas combustion heater. 3. The engine-driven air conditioner according to claim 1, wherein the heater is an electric heater. 4. An engine-driven air conditioner having a refrigeration cycle including a compressor driven by a water-cooled engine that radiates heat through a radiator, an outdoor heat exchanger, a throttle, an indoor heat exchanger, and the like. An engine drive characterized in that a cooling water circulation pump for the engine is provided with a cooling water circulation pump and a heat storage tank for heating and storing heat by circulation of the cooling water, and a bypass circuit for bypassing the cooling water with respect to the radiator is provided. Type air conditioner. 5. When the temperature of the heat storage tank drops below a predetermined temperature while the engine is stopped, the engine is operated to circulate cooling water through the engine, the heat storage tank and a bypass circuit. 5. The heat storage tank is maintained at a predetermined temperature or higher.
A method for operating the engine-driven air conditioner described. 6. When the temperature of the cooling water drops below a predetermined temperature while the engine is stopped, a cooling water circulation pump is operated to circulate a predetermined amount of cooling water through the engine, a heat storage tank and a bypass circuit. The method for operating an engine-driven air conditioner according to claim 4, wherein the cooling water is maintained at a predetermined temperature or higher by heating the cooling water with the heat stored in the heat storage tank. 7. An engine-driven air having a heat pump cycle composed of a compressor driven by a water-cooled engine that radiates heat via a radiator, a four-way valve, an outdoor heat exchanger, a throttle, an indoor heat exchanger, etc. In the harmony machine, a heat storage tank for heating and storing heat by circulation of cooling water is provided in the cooling water circulation circuit for the engine, and a bypass circuit for bypassing the cooling water for the radiator is provided, and the outdoor heat exchanger and the four sides are provided. A refrigerant pipe connecting to the valve is provided with an opening / closing valve, and a heat absorbing pipe passing through the heat storage tank is provided in parallel with the opening / closing valve, and a bypass valve is provided in the bypass circuit. Engine driven air conditioner. 8. During normal cooling / heating operation, the on-off valve is opened to circulate the refrigerant through the refrigerant pipe and the on-off valve, and the cooling water is circulated to store heat in the heat storage tank. When the temperature falls below a predetermined temperature, the bypass valve is controlled to reduce the amount of heat radiation in the radiator, and the refrigerant is flown into the heat absorption pipe according to the temperature of the cooling water to heat the cooling water in the heat storage tank, and during the heating operation. The method for operating an engine-driven air conditioner according to claim 7, wherein when the capacity is lowered, the refrigerant is caused to flow through the heat absorption pipe to absorb heat from the heat storage tank.