JP3546102B2 - Engine driven air conditioner - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air conditioner having a compressor driven by a water-cooled engine.
[0002]
[Prior art]
System diagram this type of conventional air conditioner is shown in FIG.
A refrigeration cycle is configured by connecting a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an expansion mechanism 5, and an indoor heat exchanger 6 driven by a water-cooled engine 1 by a refrigerant pipe.
[0003]
During the cooling operation, when the compressor 2 is driven by the engine 1, the gas refrigerant discharged from the compressor 2 enters the outdoor heat exchanger 4 through the four-way valve 3 as shown by the solid line arrow, where It is condensed and liquefied by radiating heat to the outside air blown by the fan 7.
[0004]
The liquid refrigerant adiabatically expands in the process of flowing through the throttle mechanism 5 and then enters the indoor heat exchanger 6 where it evaporates and vaporizes by cooling the indoor air blown by the indoor fan 8. Thereafter, the gas refrigerant returns to the compressor 2 via the four-way valve 3.
[0005]
At the time of the heating operation, the four-way valve 3 is switched in the opposite direction to the above, and the refrigerant discharged from the compressor 2 has the four-way valve 3, the indoor heat exchanger 6, the throttle mechanism 5, the outdoor heat exchanger 4. Return to the compressor 2 via the four-way valve 3 in this order.
[0006]
The cooling water that has been heated by cooling the engine 1 enters the radiator 9, where it cools by radiating heat to the outside air blown by the radiator fan 10, and is energized by the cooling water circulation pump 11 to return to the engine 1. .
[0007]
[Problems to be solved by the invention]
In the above-mentioned conventional air conditioner, when the outside air temperature decreases during the cooling operation, the amount of heat radiated from the outdoor heat exchanger 4 increases, so that the condensation capacity increases. There was a problem that the liquid refrigerant returned to the compressor 1 and the compressor 1 was damaged.
[0010]
[Means for Solving the Problems]
The present invention was invented to solve the above problems, it is an Abstract of their a compressor driven by a water-cooled engine, an outdoor heat exchanger, throttle mechanism, consisting of the indoor heat exchanger In a refrigeration cycle and an engine-driven air conditioner including a radiator for radiating cooling water of the water-cooled engine, a sub-radiator connected in parallel with the radiator is installed so as to be able to exchange heat with the outdoor heat exchanger, A flow regulating valve for adjusting the amount of cooling water circulating to the sub-radiator, an outside air temperature sensor for detecting the outside air temperature, a condensing pressure sensor for detecting the condensing pressure of the outdoor heat exchanger, the outside air temperature sensor and the condensing pressure sensor A controller that controls the condensation capacity of the outdoor heat exchanger by adjusting the opening of the flow control valve in accordance with the detected value of In an engine driving type air conditioner according to claim.
[0011]
During the cooling operation, the controller controls the opening degree of the flow control valve according to the outside air temperature and the condensing pressure to control the condensing capacity of the outdoor heat exchanger.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention is shown in FIGS.
As shown in FIG. 1, a sub radiator 12 is connected in parallel with the radiator 9, and the sub radiator 12 is installed so as to be able to exchange heat with the outdoor heat exchanger 4.
At the cooling water inlet of the sub radiator 12, a flow regulating valve 13 for adjusting the cooling water circulation amount is provided, and the opening of the flow regulating valve 13 is controlled by a controller 14.
[0018]
The outside air temperature detected by the outside air temperature sensor 15 and the refrigerant pressure at the outlet of the outdoor heat exchanger 4 detected by the pressure sensor 16 are input to the controller 14A.
The other configuration is the same as that of the conventional one shown in FIG.
[0019]
Control flowchart of the controller 14A is shown in FIG.
When the operation of the air conditioner is started, the outside air temperature is detected by the outside air temperature sensor 15. When the detected outside air temperature is equal to or lower than the set temperature, the condensing pressure of the outdoor heat exchanger 4 is detected by the pressure sensor 16, and PID calculation and fuzzy calculation are performed based on the condensing pressure to determine the opening of the flow control valve 13. Is done.
The determined opening is output to the flow control valve 13, and this opening is set as the determined opening.
[0020]
Thus, since the opening of the flow control valve 13 is determined according to the outside air temperature and the condensation pressure, the condensation capacity of the outdoor heat exchanger 4 can be accurately controlled.
[0021]
【The invention's effect】
In the present invention, the condensing capacity of the outdoor heat exchanger is controlled by adjusting the opening of the flow control valve in accordance with the detection values of the outside air temperature sensor and the condensing pressure sensor. , The reliability of the compressor can be improved, and the condensation capacity of the outdoor heat exchanger can be accurately controlled.
[Brief description of the drawings]
1 is a system diagram showing a implementation form of the present invention.
2 is a flow chart of the implementation forms.
FIG. 3 is a system diagram of a conventional engine-driven air conditioner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Compressor 4 Outdoor heat exchanger 5 Throttle mechanism 6 Indoor heat exchanger 9 Radiator 12 Sub-radiator 13 Flow control valve 15 Outside temperature sensor 14 Controller

Claims (1)

In a compressor driven by a water-cooled engine, an outdoor heat exchanger, a throttle mechanism, a refrigeration cycle including an indoor heat exchanger, and an engine-driven air conditioner including a radiator for radiating cooling water of the water-cooled engine,
A sub-radiator connected in parallel with the radiator is installed so as to be capable of exchanging heat with the outdoor heat exchanger, and a flow control valve for adjusting a cooling water circulation amount to the sub-radiator, and an outside air temperature sensor for detecting an outside air temperature. A condensing pressure sensor for detecting the condensing pressure of the outdoor heat exchanger, and a condensing pressure of the outdoor heat exchanger by adjusting an opening degree of the flow control valve in accordance with detection values of the outside air temperature sensor and the condensing pressure sensor. An engine-driven air conditioner comprising a controller for controlling the capacity.

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