CN213838707U

CN213838707U - Ventilation system of gas engine

Info

Publication number: CN213838707U
Application number: CN202022832995.1U
Authority: CN
Inventors: 李湘华
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-30
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a gas engine ventilation system, which comprises an air filter, a turbocharger, an intercooler, a throttle valve, an engine combustion chamber, an engine crankcase and an oil-gas separator; the pneumatic diaphragm three-way regulating valve is also included; the air filter is connected with a compressor of the turbocharger through a first air inlet pipe; the other end of the compressor of the turbocharger is connected with the intercooler; the other end of the intercooler is connected with the throttle valve; the other end of the throttle valve is connected with the engine combustion chamber through a second air inlet pipe; the oil-gas separator is connected with the engine crankcase; the oil-gas separator is communicated with the first air inlet pipe and the second air inlet pipe through the pneumatic film three-way regulating valve. Adopt the utility model discloses can reduce the machine oil by a wide margin and consume, improve engine emission level, improve engine reliability.

Description

Ventilation system of gas engine

Technical Field

The utility model relates to a six engine ventilation technical field in state, concretely relates to gas engine ventilation system.

Background

In the existing ventilation system of the national six-gas engine, fresh air (hereinafter referred to as new gas) is subjected to air filtration and then is changed into high-temperature and high-pressure gas by entering a supercharger compressor, the temperature of the gas is reduced after passing through an intercooler, the pressure in an air inlet pipe is reduced to a required level by adjusting the opening degree of a rear throttle valve, then the temperature and pressure adjusted new gas enters a combustion chamber of an engine, the new gas and fuel are subjected to combustion reaction in the combustion chamber, most of gas (hereinafter referred to as waste gas) generated after combustion reaches a supercharger turbine through an exhaust pipe, a turbine is driven to rotate to apply work to the compressor, and finally the gas is exhausted into the atmosphere through a post-processor; and the other small part (about 0.7-1%) of waste gas leaks into a crankcase of the engine through gaps among the piston, the piston ring and the cylinder sleeve, and enters an air inlet pipe in front of a supercharger compressor after passing through an oil-gas separator. This leads to several problems: 1. the oil consumption is greatly increased; 2. the combustion of the oil entering the combustion chamber results in poor emissions; 3. some engine oil stored in the air inlet pipe enters the combustion chamber in a large amount when the working condition is changed, which may cause knocking or fire phenomena and influence the reliability and safe operation of the engine. The six engines in China have higher requirements on indexes such as emission, environmental protection and performance, and therefore the technical problem is that the six engines in China need to be optimized in a key mode at present.

The above background disclosure is only provided to aid in understanding the concepts and technical solutions of the present invention, and it does not necessarily belong to the prior art of the present patent application, and it should not be used to assess the novelty and inventive step of the present application without explicit evidence that the above content has been disclosed at the filing date of the present patent application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to above-mentioned technical problem provide a can reduce the machine oil by a wide margin and consume, improve the engine and discharge the level, improve the gas engine ventilation system of engine reliability.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a gas engine ventilation system comprises an air filter, a turbocharger, an intercooler, a throttle valve, an engine combustion chamber, an engine crankcase and an oil-gas separator; the pneumatic diaphragm three-way regulating valve is also included; the air filter is connected with a compressor of the turbocharger through a first air inlet pipe; the other end of the compressor of the turbocharger is connected with the intercooler; the other end of the intercooler is connected with the throttle valve; the other end of the throttle valve is connected with the engine combustion chamber through a second air inlet pipe; the oil-gas separator is connected with the engine crankcase; the oil-gas separator is communicated with the first air inlet pipe and the second air inlet pipe through the pneumatic film three-way regulating valve; the exhaust gas outlet of the engine combustion chamber is connected to the turbine of the turbocharger.

The control mode of the pneumatic film three-way regulating valve is that when the relative pressure P connected with the end of the second air inlet pipe is less than-5 kPa, the pneumatic film three-way regulating valve controls the valve core to communicate the oil-gas separator with the second air inlet pipe and close the channel between the oil-gas separator and the first air inlet pipe; when the relative pressure P connected with the end of the second air inlet pipe is larger than-1 kPa, the pneumatic film three-way regulating valve controls the valve core to communicate the oil-gas separator with the two interfaces of the first air inlet pipe and close the channels of the oil-gas separator and the second air inlet pipe.

The utility model has the advantages of compared with the prior art:

1. compared with other gas machines, the national six gas machine has obvious difference in air intake control, namely the national six gas machine carries out accurate calculation according to the gas quantity and controls the air intake quantity to ensure that the air intake quantity is neither too much nor too little, so that the air of an air inlet pipe of the national six gas machine is relatively thin when the national six gas machine runs at low load, and the national six gas machine is always in a negative pressure state compared with the air pressure of a crankcase; therefore, the engine oil of the traditional ventilation system can be easily sucked into the air inlet pipe and the combustion chamber, the engine oil burning condition is easy to occur, and the ventilation system and the control method can greatly reduce the probability that the engine oil is sucked into the combustion chamber and greatly reduce the engine oil consumption; particularly, the engine oil entering the second air inlet pipe and remaining basically disappears, and the probability of engine fire or detonation is reduced because the remaining engine oil suddenly enters the combustion chamber, so that the reliability and the safe operation of the engine are improved;

2. the amount of engine oil entering the combustion chamber is reduced, and the emission level of the engine is obviously improved;

3. when the engine is under a small load, the pressure of a crankcase is reduced, namely the back pressure of a piston is reduced, the friction work of the engine is reduced, and the gas consumption is obviously improved.

Drawings

Fig. 1 is a schematic view of a connection structure of each component of the present invention.

Detailed Description

As shown in fig. 1, a ventilation system of a gas engine comprises an air filter 1, a turbocharger, an intercooler 11, a throttle valve 5, an engine combustion chamber 7, an engine crankcase 8 and an oil-gas separator 9; the pneumatic diaphragm three-way regulating valve 10 is also included; the air filter is connected with a compressor 12 of the turbocharger through a first air inlet pipe 2; the other end of the compressor 12 of the turbocharger is connected with the intercooler 11; the other end of the intercooler is connected with the throttle valve 5; the other end of the throttle valve 5 is connected with the engine combustion chamber 7 through a second air inlet pipe 6; the oil-gas separator 9 is connected with the engine crankcase; the oil-gas separator 9 is communicated with the first air inlet pipe 2 and the second air inlet pipe 6 through the pneumatic film three-way regulating valve 10. Of course, the exhaust gas outlet of the engine combustion chamber 7 is connected to the turbine 3 of the turbocharger.

The pneumatic membrane three-way regulating valve is in the prior art, the control standard of the regulating valve is adjustable, and the control standard of the pneumatic membrane three-way regulating valve of the embodiment is as follows: when the relative pressure P connected with the end of the second air inlet pipe is less than-5 kPa, the pneumatic film three-way regulating valve controls the valve core to communicate the oil-gas separator with the second air inlet pipe and close the channel between the oil-gas separator and the first air inlet pipe; when the relative pressure P connected with the end of the second air inlet pipe is larger than-1 kPa, the pneumatic film three-way regulating valve controls the valve core to communicate the oil-gas separator with the two interfaces of the first air inlet pipe and close the channels of the oil-gas separator and the second air inlet pipe.

Claims

1. A gas engine ventilation system characterized by: the engine comprises an air filter, a turbocharger, an intercooler, a throttle valve, an engine combustion chamber, an engine crankcase and an oil-gas separator; the pneumatic diaphragm three-way regulating valve is also included; the air filter is connected with a compressor of the turbocharger through a first air inlet pipe; the other end of the compressor of the turbocharger is connected with the intercooler; the other end of the intercooler is connected with the throttle valve; the other end of the throttle valve is connected with the engine combustion chamber through a second air inlet pipe; the oil-gas separator is connected with the engine crankcase; the oil-gas separator is communicated with the first air inlet pipe and the second air inlet pipe through the pneumatic film three-way regulating valve; the exhaust gas outlet of the engine combustion chamber is connected to the turbine of the turbocharger.

2. A gas engine ventilation system as claimed in claim 1, wherein: the control mode of the pneumatic film three-way regulating valve is that when the relative pressure P connected with the end of the second air inlet pipe is less than-5 kPa, the pneumatic film three-way regulating valve controls the valve core to communicate the oil-gas separator with the second air inlet pipe and close the channel between the oil-gas separator and the first air inlet pipe; when the relative pressure P connected with the end of the second air inlet pipe is larger than-1 kPa, the pneumatic film three-way regulating valve controls the valve core to communicate the oil-gas separator with the two interfaces of the first air inlet pipe and close the channels of the oil-gas separator and the second air inlet pipe.