JPH08247572A - Engine-drive type air conditioner - Google Patents

Abstract

PURPOSE: To prevent the damage to a compressor at the time of restarting the operation of an air conditioner due to liquid compression by the storage of liquid refrigerant in the compressor during stopping of the conditioner for a long period. CONSTITUTION: A heat accumulator 20 is provided on the way of a cooling water circuit 11 between an engine 1 and a radiator 9. A heating medium circulating circuit for connecting the heat exchange coil 21 provided in the accumulator 20 to the heat exchanging coil 22 provided on the outer periphery of a compressor 2 via a tube 26 is formed, and a pump 23 is provided in the circuit. When the temperature of the compressor 2 detected by a sensor 25 is lowered, the pump 23 is operated by a command from a controller 24 to circulate the medium to feed the heat stored in the accumulator 20 to the compressor 2 to heat it.

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 When the operation of a conventional air conditioner of this kind is stopped for a long time, a so-called refrigerant stagnation state occurs in which the refrigerant in the refrigerant circuit accumulates inside the compressor having a low temperature. If the operation of the air conditioner is restarted in this state, the compressor may damage the liquid refrigerant accumulated inside the compressor.

[0003]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a compressor driven by a water-cooled engine that radiates heat through a radiator. , Outdoor heat exchanger, throttling mechanism,
In an engine-driven air conditioner having a refrigeration cycle including an indoor heat exchanger, etc., a heat storage tank is provided in the middle of a cooling water circuit between the engine and the radiator, and the heat storage tank is used when the temperature of the compressor drops. An engine-driven air conditioner is provided with a heat transfer device for transferring the heat stored in the compressor to the compressor.

Another feature is that the heat transfer device is provided from a heat exchange coil provided in the heat storage tank, a heat exchange coil provided on the outer periphery of the compressor, and a pipe connecting these heat exchange coils. The heat medium circulating system passage in which the following heat medium is enclosed, and the pump provided in the heat medium circulating system passage.

Another feature is that a sensor for detecting the temperature of the compressor and a controller for turning on / off the pump according to the temperature detected by the sensor are provided.

[0006]

In the present invention, heat is stored in the heat storage tank by radiating heat during the operation of the air conditioner by the cooling water whose temperature has been raised by cooling the engine as it flows through the heat storage tank. When the temperature of the compressor decreases while the air conditioner is stopped, the heat stored in the heat storage tank is transferred to the compressor by the heat transfer device to heat it.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. In FIG. 1 (A), when the compressor 2 is driven by the engine 1 during the cooling operation, the gas refrigerant discharged from the compressor 2 passes through the four-way valve 3 to the outdoor heat exchanger 4 as indicated by a solid arrow. It enters and is condensed and liquefied by radiating heat to the outside air sent by the outdoor fan 7.

This liquid refrigerant is adiabatically expanded in the process of passing through the throttling mechanism 5, and then enters the indoor heat exchanger 6, where the indoor air blown by the indoor fan 8 is cooled 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 passes through the four-way valve 3, the indoor heat exchanger 6, the throttle mechanism 5, the outdoor heat exchanger 4, and the four-way valve 3 in this order as shown by the broken line arrow. Return to compressor 2.

The cooling water whose temperature has been raised by cooling the engine 1 enters the radiator 9, where it is cooled by radiating heat to the outside air blown by the outdoor fan 7, and then urged by the cooling water circulation pump 10 to urge the engine. 1
Return to The above is the same as the conventional one.

A heat storage tank 20 is provided in the cooling water circuit 11 from the engine 1 to the radiator 9, and the heat storage tank 2 is provided.
A heat exchange coil 21 is arranged in the zero. The heat exchange coil 21 is connected to the heat exchange coil 22 provided on the outer periphery of the compressor 2 via a pipe 26 to form a heat medium circulation system path, and a heat medium is sealed inside. .

A pump 23 is provided in this heat medium circulation system path, and this pump is on / off controlled by a command from a controller 24. The controller 24 detects a temperature sensor 25 for detecting the temperature of the compressor 2. The value is entered.

Thus, the cooling water heated by cooling the engine 1 during the operation of the air conditioner receives the heat storage tank 20.
And heat is stored in the heat storage tank 20 in this process.

When the temperature of the compressor 2 is lowered by stopping the air conditioner for a long time and reaches the temperature a as shown in FIG. 1 (B), a signal from the temperature sensor 25 which detects this is received. Then, the controller 24 outputs an ON command to the pump 23. Then, the pump 23 is activated and the heat medium circulates in the heat medium circulation system path. In this process, the heat stored in the heat storage tank 20 is absorbed by the heat medium via the heat exchange coil 21 and the pipe 26 is passed. Is transferred to the compressor 2 via the heat exchange coil 22, and the compressor 2 is heated via the heat exchange coil 22.

As a result, the temperature of the compressor 2 is reduced to that shown in FIG.
When the temperature b shown in (B) rises, the pump 23 stops. By repeating this, the compressor 2 becomes the temperatures a and b.
Maintained between.

As a result, even if the air conditioner is stopped for a long period of time, the temperature of the compressor 2 does not drop, so that the refrigerant does not accumulate inside the compressor, so that when the operation of the air conditioner is restarted It is possible to prevent damage due to compression.

[0017]

According to the present invention, when the temperature of the compressor is lowered, the heat stored in the heat storage tank is transferred to the compressor by the heat transfer device to heat it, so that the air conditioner is stopped for a long time. However, the refrigerant does not accumulate inside the compressor 2, and therefore the compressor can be prevented from being damaged by liquid compression when the operation of the air conditioner is restarted.

[Brief description of drawings]

FIG. 1 shows one embodiment of the present invention, (A) is a system diagram,
(B) is a diagram showing the relationship between the temperature of the compressor and ON / OFF of the pump.

[Explanation of symbols]

 9 radiator 1 engine 2 compressor 4 outdoor heat exchanger 5 throttling mechanism 6 indoor heat exchanger 11 cooling water circuit 20 heat storage tank 21, 22 heat exchange coil 26 pipe 23 pump 25 temperature sensor 24 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 (3)

[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 mechanism, an indoor heat exchanger, etc. A heat transfer tank is provided in the middle of the cooling water circuit between the engine and the radiator, and a heat transfer device that transfers the heat stored in the heat storage tank to the compressor when the temperature of the compressor is lowered is provided. A characteristic engine-driven air conditioner. 2. A heat transfer medium comprising a heat exchange coil provided in the heat storage tank of the heat transfer device, a heat exchange coil provided on the outer periphery of the compressor, and a pipe connecting the heat exchange coils. The engine-driven air conditioner according to claim 1, comprising a heat medium circulation system passage and a pump provided in the heat medium circulation system passage. 3. A sensor for detecting the temperature of the compressor,
The engine-driven air conditioner according to claim 2, further comprising a controller for turning on / off the pump according to a temperature detected by the sensor.