JPH09112240A - Engine-driven air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an oil amount discharged from the crank case of a gas engine by being followed by blowby gas. SOLUTION: An oil separator 17 is arranged in a passage 16 for discharging blowby gas from the crank case 1A of a gas engine 1, oil separated in the oil separator 17 is returned to the crank case 1A through an oil return pipe 19, and blowby gas from which oil is separated is introduced to any one of atmosphere, the intake system or discharge system of the engine 1 by a gas passage 18.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air conditioner having a compressor driven by a gas engine.

[0002]

2. Description of the Related Art A system diagram of a conventional air conditioner of this type is shown in FIG.
Is shown in As shown in FIG. 3, the refrigeration cycle is configured by connecting the compressor 2, which is driven by the gas engine 1, the four-way valve 3, the outdoor heat exchanger 4, the expansion mechanism 5, and the indoor heat exchanger 6 with a refrigerant pipe. ing.

When the compressor 2 is driven by the gas engine 1 during the cooling operation, 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 arrow. Here, the heat is radiated to the outside air blown by the outdoor fan 9 to be 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 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 four-way valve 3 is switched in the opposite direction, and the refrigerant discharged from the compressor 2 has the four-way valve 3, the indoor heat exchanger 6, the throttling mechanism 5 and the outdoor as shown by the broken line arrow. After passing through the heat exchanger 4 and the four-way valve 3 in this order, the compressor 2
Return to

Combustion air enters a mixer 11 via an air supply pipe 9 and an air cleaner 10 and is mixed there with a fuel gas supplied through a fuel gas supply pipe 12 to form an air-fuel mixture. It is sucked into the gas engine 1 through the valve 13. Exhaust gas discharged from the gas engine 1 is discharged through an exhaust muffler 15 installed in an exhaust pipe 14.

During operation of the gas engine 1, a part of the combustion gas passes through a gap between the cylinder and the piston to form a crankcase.
It leaks to 1A. This combustion gas mixes with the mist of oil scattered in the crankcase 1A to become blow-by gas, and is discharged into the atmosphere through the blow-by gas discharge passage 16.

[0008]

In the above conventional air conditioner, the blow-by gas is discharged to the atmosphere as it is through the discharge passage 16, so that if the cumulative operating time of the air conditioner becomes long, the blow-by gas is accompanied by the blow-by gas. As a result, the amount of oil that is discharged to the atmosphere increases, and as a result, the amount of oil that is stored in the crankcase 1A decreases, which may cause poor lubrication of the gas engine 1 and abnormal wear and seizure due to this. .

[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 a gas engine, an outdoor heat exchanger, and a throttle mechanism. In an engine-driven air conditioner equipped with a refrigeration cycle consisting of an indoor heat exchanger, an oil separator for oil separation is provided in the blow-by gas discharge passage from the crankcase of the gas engine, and separated by this oil separator. An engine driven air provided with an oil return pipe for returning oil to the crankcase and a gas passage for introducing the blow-by gas in which the oil is separated into the atmosphere and either the intake system or the exhaust system of the gas engine. It is in a harmony machine.

Another feature is that a cyclone type oil separator is used as the oil separator.

The blow-by gas is guided from the crankcase of the gas engine through the blow-by gas discharge passage to the oil separator, where the oil is separated from the blow-by gas. The blow-by gas from which the oil has been separated is introduced into the atmosphere, either the intake system or the exhaust system of the gas engine through the gas passage. The separated oil returns to the crankcase of the gas engine through the oil return pipe.

[0012]

1 and 2 show an embodiment of the present invention.
Is shown in As shown in FIG. 1, a cyclone type oil separator 17 for oil separation is provided in the blow-by gas discharge passage 16 from the crankcase 1A of the engine 1.
An oil return pipe 19 for returning the oil separated by the oil separator 17 to the crankcase 1A and a gas passage 18 for guiding the blow-by gas from which the oil has been separated to the intake pipe 9 are provided.

The cyclone type oil separator 17 is shown in FIG.
And a cylindrical portion 20 installed substantially vertically, as shown in FIG.
The taper portion 21 is tapered downward from the lower end thereof, and the lid portion 22 covers the upper end of the cylindrical portion 20.

The upper portion of the cylindrical portion 20 penetrates through the cylindrical portion.
A blow-by gas discharge passage 16 is connected so as to extend in the tangential direction in the vicinity of the inner surface of 20, a gas passage 18 is connected so as to extend downward through the center of the lid portion 22, and the taper portion 21 An oil return pipe 19 is connected to the lower end. The other configuration is the same as that of the conventional one shown in FIG. 3, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

However, during operation of the gas engine 1, the blow-by gas discharged from the crankcase 1A enters the oil separator 17 through the discharge passage 16 and its cylindrical portion.
During the process of swirling along the inner surface of 20, the oil mist contained in the blow-by gas is separated by the centrifugal force and adheres to the inner surface of the cylindrical portion 20 and the tapered portion 21. The oil 23 gradually descends due to gravity and enters the oil return pipe 19, and returns to the crankcase 1A through the oil return pipe 19.

On the other hand, the gas from which the oil has been separated rises while swirling, enters the gas passage 18, and enters the air supply pipe 9 through the gas passage 18. Then, it is sucked into the gas engine 1 through the mixer 11 and the throttle valve 13 along with the combustion air passing through the air supply pipe 9.

Thus, the oil mist contained in the blow-by gas is separated from the blow-by gas in the oil separator 17 and returned to the crankcase 1A through the oil return pipe 19, so that the oil consumption is much larger than that of the conventional one. Less.

In the above embodiment, the gas passage
Although 18 is connected to the air supply pipe 9, it can be connected to any position of the air supply system of the engine 1, and the exhaust pipe 14,
It can be discharged into the atmosphere together with the exhaust gas by connecting to an exhaust system including an exhaust muffler 15 and the like, and can also be directly discharged into the atmosphere.

[0019]

According to the present invention, the blow-by gas is guided to the oil separator, and the oil separated from the blow-by gas returns to the crankcase of the engine through the oil return pipe. Compared with other things, it can be drastically reduced, so the inspection and maintenance cycle of the engine can be extended.

If a cyclone type oil separator is used as the oil separator, the oil can be efficiently separated from the blow-by gas and the oil separator can be inspected.
No need for maintenance.

[Brief description of the drawings]

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

2A and 2B show the cyclone type oil separator according to the above embodiment, wherein FIG. 2A is a vertical sectional view, and FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 2 is a system diagram showing a conventional engine-driven air conditioner.

[Explanation of symbols]

 1 Gas engine 1A Crankcase 2 Compressor 4 Outdoor heat exchanger 5 Throttling mechanism 6 Indoor heat exchanger 16 Blow-by gas discharge passage 17 Oil separator 19 Oil return pipe 18 Gas passage

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[Procedure amendment]

[Submission date] February 23, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

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

2A and 2B show a cyclone type oil separator according to the above embodiment, where FIG. 2A is a longitudinal sectional view and FIG. 2B is B of FIG.
It is sectional drawing which follows the -B line.

FIG. 3 is a system diagram showing a conventional engine-driven air conditioner.

[Explanation of Codes] 1 gas engine 1A crankcase 2 compressor 4 outdoor heat exchanger 5 throttling mechanism 6 indoor heat exchanger 16 blow-by gas discharge passage 17 oil separator 19 oil return pipe 18 gas passage

 ─────────────────────────────────────────────────── ─── 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 having a refrigeration cycle including a compressor driven by a gas engine, an outdoor heat exchanger, a throttle mechanism, and an indoor heat exchanger, wherein a blow-by from a crankcase of the gas engine. Provide an oil separator for oil separation in the gas discharge path,
An oil return pipe for returning the oil separated by the oil separator to the crankcase is provided, and a gas passage for guiding the blowby gas from which the oil has been separated to the atmosphere, either the intake system or the exhaust system of the gas engine is provided. An engine driven air conditioner. 2. A cyclone type oil separator is used as the oil separator.
The engine-driven air conditioner described.