JPH09100708A - Engine driving type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the seizure and abnormal wearing of a lubricated spot by starting an engine for driving a compressor with no lubricating oil in its lubricated spot at the time of starting the running of an air conditioner. SOLUTION: A shut-off valve 18 is provided in the fuel supply system 12 of an engine 1 and by driving a starter motor 13 for a fixed period T at the time of starting the engine 1 in a state where the shut-off valve 8 is closed by a starting operation control means 21 and then cranking the motor, lubricating oil is supplied to a spot to be lubricated by a pump incorporated in the engine 1 and then the engine 1 is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an engine-driven air conditioner.

[0002]

2. Description of the Related Art A system diagram of a conventional engine-driven air conditioner is shown in FIG. As shown in FIG. 4, the compressor 2, which is driven by the engine 1 with the starter motor 11, the four-way valve 3, the outdoor heat exchanger 4, the throttle mechanism 5, and the indoor heat exchanger 6 are connected by a refrigerant pipe to perform refrigeration. The cycle is made up.

During cooling operation, the compressor 2 is driven by the engine 1.
When is driven, the gas refrigerant discharged from the compressor 2 enters the outdoor heat exchanger 4 via the four-way valve 3 and radiates heat to the outside air blown by the outdoor fan 7 as shown by the solid arrow. It is condensed and liquefied.

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 sent 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 risen by cooling the engine 1 enters the radiator 9 where it radiates heat to the outside air sent by the outdoor fan 7 to lower the temperature.
It is energized by the cooling water circulation pump 10 and returns to the engine 1.

The fuel gas supplied through the fuel gas supply pipe 12 enters the carburetor 14, where it is mixed with the fuel air supplied through the air supply pipe 13 to form an air-fuel mixture and is supplied to the engine 1 through the throttle valve 15. To be done.

[0008]

In the above conventional air conditioner, when this is stopped for a long time, the lubricating oil of the engine 1 gradually returns from each lubrication point to the oil pan 1A. When the operation of the air conditioner is restarted in this state, there is a problem that lubrication points of the engine 1 are abnormally worn or seized due to poor lubrication.

[0009]

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 an engine with a starter motor and an outdoor heat exchanger. In an engine-driven air conditioner in which a refrigeration cycle is configured by connecting a throttle mechanism, an indoor heat exchanger, etc. with a refrigerant pipe, a shutoff valve is provided in the fuel supply system of the engine and the air conditioner is started. The engine-driven air conditioner is provided with a start control means for cranking by driving the starter motor for a certain period of time with the shutoff valve shut off.

Another feature of the present invention is that a time measuring means is provided for operating the start control means only when the air conditioner is started after being stopped for a predetermined time or longer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 to 3, FIG. 1 is a system diagram, FIG. 2 is a time chart, and FIG. 3 is a control flow chart. As shown in FIG. 1, a shutoff valve 18 is provided in the fuel supply system 12 of the engine 1, and the shutoff valve 18 and the starter motor 11 are controlled by a control device 200.

The control device 200 comprises a start control means 21, a time measuring means 22 for measuring the stop time of the engine 1, and a timer 23 for setting the drive time of the starter motor 11. When the operation switch 20 is turned on, the signal from this is input to the start control means 21 and the timekeeping means 22 of the control device 200.

Then, the starting control means 21 is the starter motor.
Output to 11 to start this. Then, the stop time of the air conditioner clocked by the timing means 22 is a predetermined time, for example,
If it is within 2 hours, it is immediately output to the shutoff valve 18 to open it, but if the predetermined time has elapsed, the timer 23
Shut-off valve after a fixed time T set to, for example, 2 minutes
Output to 18 and open this.

When the engine 1 is started in this way, the starter motor 11 is stopped and the clock means 22 is cleared.

When the operation switch 20 is turned off during the operation of the air conditioner, this signal is input to the start control means 21, and the shutoff valve 18 is closed by a command from this, and the engine 1
Is stopped. At the same time, the timing means 22 starts counting the stop time.

Thus, when the air conditioner is stopped after the air conditioner has stopped for a predetermined time or longer, the engine 1 is cranked by the starter motor 11 for a predetermined time T, and during this time, the engine 1 is lubricated by a lubricating oil pump. Since the engine 1 is started after the lubricating oil is supplied to the lubrication points, it is possible to prevent seizure or abnormal wear of the lubrication points due to poor lubrication.

[0017]

According to the present invention, when the air conditioner is started, the engine is cranked for a certain period of time with the fuel cut off, and the engine is started with the lubricating oil supplied to each lubricating point. Therefore, it is possible to prevent seizure and abnormal wear of the lubricated parts of the engine at the time of starting the engine due to poor lubrication, so that the durability and reliability of the engine can be improved.

If the time control means for activating the start control means only at the time of starting after the air conditioner has been stopped for a predetermined time or longer is provided, the engine can be immediately started except when the air conditioner has been stopped for a predetermined time or longer. it can.

[Brief description of the drawings]

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

FIG. 2 is a time chart in the above embodiment.

FIG. 3 is a flowchart in the above embodiment.

FIG. 4 is a system diagram of a conventional engine-driven air conditioner.

[Explanation of symbols]

 1 engine 11 starter motor 2 compressor 4 outdoor heat exchanger 5 throttling mechanism 6 indoor heat exchanger 12 fuel supply system 18 shutoff valve 200 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 (2)

[Claims] 1. An engine-driven air conditioner in which a refrigeration cycle is configured by connecting a compressor driven by an engine with a starter motor, an outdoor heat exchanger, a throttle mechanism, an indoor heat exchanger, etc. with a refrigerant pipe. In the engine, a shutoff valve is provided in the fuel supply system of the engine, and start control means for driving the starter motor for a certain period of time and cranking the shutoff valve when the air conditioner is started are provided. Engine driven air conditioner. 2. The engine-driven air conditioner according to claim 1, further comprising a timing means for activating the start control means only when the air conditioner is started after being stopped for a predetermined time or longer.