JPH0295765A - Oxygen enriching air device for internal combustion engine - Google Patents

Abstract

PURPOSE:To make nitrogen enriching air dischargeable without installing any pump as well as to abate the extent of energy consumption by installing an exhaust port of the nitrogen enriching air residually generated by generating oxygen enriching air by an oxygen enriching air device in having it adjoined to an air current to be produced by drive of an internal combustion engine. CONSTITUTION:An oxygen enriching air device 4 is provided with an oxygen enricher 26 such as a gaseous selective transmitted film or the like, and it generates oxygen enriching air at the side of a takeout port 32 by the oxygen enricher 26 when a pressure differential is produced between the side of an inlet 28 and this takeout port 32 side of the oxygen enricher 26 by a suction pump 34. This generated oxygen enriching air is fed to the side of an intake passage 10. At time of generation of this oxygen enriching air, nitrogen enriching air enhanced of nitrogen density is residually generated at the intake 28 side of the oxygen enricher 26. Accordingly, there is provided with an exhaust port 42 being interconnected to the intake 28 side of the oxygen enricher 26 is installed there, this exhaust port 42 is made so as to be installed in adjoining it to a cooling air current 44a in a cooling air passage 44 where cooling air being produced by drive of a cooling fan 24 flows.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to an oxygen-enriched air system for an internal combustion engine, and particularly relates to an oxygen-enriched air system for an internal combustion engine, and more particularly, to an oxygen-enriched air system for an internal combustion engine. The present invention relates to an oxygen-enriched air system for an internal combustion engine that can discharge oxygenated air without providing a discharge pump.

[Conventional technology]

Air with a high oxygen concentration (
There is an internal combustion engine that is supplied with oxygen-enriched air by a device (hereinafter referred to as an "oxygen-enriched air device") that generates oxygen-enriched air (hereinafter referred to as "oxygen-enriched air"). As shown in FIG. 5, the conventional oxygen concentrator 201 has an air intake port 202 and an air intake port 20.
3 by a suction pump 204, and an oxygen concentrator 205 such as a gas-selective permeable membrane generates oxygen-enriched air with an increased oxygen concentration on the outlet 202 side.

In this way, while oxygen-enriched air with increased oxygen concentration is generated on the intake port 202 side, air with increased nitrogen concentration (hereinafter referred to as "nitrogen-enriched air") is generated on the intake port 203 side due to the reduction in oxygen concentration. ) will be residually generated. When this nitrogen-enriched air stays around the oxygen concentrator 201,
There is a disadvantage that oxygen-enriched air cannot be sufficiently generated due to saturation with nitrogen-enriched air and lower oxygen enrichment rate.

Therefore, conventionally, as shown in FIG.
07 was provided, and a fan 208 was used to exhaust nitrogen-enriched air.

[Problem that the invention seeks to solve]

However, providing a discharge pump in this way has the disadvantage of increasing weight and cost due to an increase in the number of parts.In addition, driving the discharge pump consumes energy generated by the internal combustion engine, which reduces operational efficiency. This resulted in an inconvenience that resulted in a decrease in performance.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to generate oxygen-enriched air using an oxygen-enriched air device, thereby discharging residual nitrogen-enriched air without providing a discharge pump.
As a result, the object of the present invention is to realize an oxygen enriched air system for an internal combustion engine that can achieve weight reduction and cost reduction due to a reduction in the number of parts, and can also achieve improvement in internal combustion engine operating efficiency due to a reduction in energy consumption.

[Means for solving problems]

In order to achieve this object, the present invention increases the oxygen concentration of the air taken in from the air intake and generates oxygen-enriched air. The present invention is characterized in that an exhaust port for nitrogen-enriched air that is residually generated by increasing the oxygen concentration is provided in communication with the airflow facing the airflow generated by the drive of the internal combustion engine.

[Effect]

According to the configuration of the present invention, the exhaust port for the nitrogen-enriched air that is residually generated by generating the oxygen-enriched air by the oxygen-enriched air device is provided facing the airflow generated by the drive of the internal combustion engine. The nitrogen-enriched air can be discharged by the suction force of the airflow generated by the drive of the internal combustion engine without providing a discharge pump, and the energy consumption can be reduced.
A large amount of air can be supplied to the intake port side by discharging nitrogen-enriched air using the suction force of the airflow generated by the drive of the internal combustion engine.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows a first embodiment of the invention. In the figure, 2 is an internal combustion engine, and 4 is an oxygen enriched air system.

Air taken in from the intake port 8 of the air cleaner 6 of the internal combustion engine 2 is mixed with fuel by the carburetor 12 provided in the intake passage 10 to produce an air-fuel mixture.

The air-fuel mixture is introduced into the combustion chamber 14 and is ignited and combusted by the spark plug 16 to cause the piston 18 to reciprocate.The reciprocating motion of the piston 18 is transmitted to the crankshaft 22 via the connecting rod 20, resulting in rotational driving force. Convert and extract.

This driving force causes a vehicle or the like to travel. This crankshaft 22 is provided with a cooling fan 24 for forced cooling.

That is, this internal combustion engine 2 is a forced air-cooled internal combustion engine 2.

The oxygen-enriched air device 4 includes an oxygen concentrator 26 such as a gas-selective permeable membrane, and a filter 30 on the air intake port 28 side.
A suction pump 3 is provided on the oxygen-enriched air outlet 32 side.
There are 4. This suction pump 34 includes, for example, a crankshaft pulley 36a, a pump pulley 36b, and a belt 3.
The internal combustion engine 2 is driven by the driving force transmission mechanism 36 consisting of 6C. This suction pump 34 creates a pressure difference between the intake port 28 side and the outlet port 32 side of the oxygen concentrator 26, and the oxygen enriched air is generated on the outlet port 32 side by the oxygen concentrator 26. The suction pump 34 is provided with a communication passage 38 that communicates with the air cleaner 6 at the upstream end of the intake passage 10, and the generated oxygen-enriched air is transferred to the intake passage 10.
feed on the side.

In addition, the code|symbol 40 is a check valve provided in the air cleaner 6. This check valve 40 allows oxygen-enriched air to flow into the intake port 8.
This prevents the air from flowing out into the atmosphere, and allows the air to flow into the intake passage 10 as necessary.

When the oxygen concentration on the intake port 32 side of the oxygen concentrator 26 is increased to generate oxygen-enriched air by the oxygen enriched air device 2, the nitrogen concentration on the intake port 28 side of the oxygen concentrator 26 is reduced due to the reduction in oxygen concentration. A residual amount of increased nitrogen-enriched air is produced. Therefore, an exhaust port 42 is provided that communicates with the intake port 28 side of the oxygen concentrator 26, and this exhaust port 42 is provided facing the airflow generated by the drive of the internal combustion engine 2.

In this first embodiment, the crankshaft 2 of the internal combustion engine 2
A nitrogen-enriched air outlet 38 is provided facing the cooling air flow 44a of the cooling air passage 44 through which the cooling air generated by the driving of the cooling fan 24 provided in the cooling fan 24 flows.

Next, the operation of the first embodiment will be explained.

When the internal combustion engine 2 is driven, the oxygen concentrator 26 of the oxygen enriched air device 4 generates oxygen enriched air with an increased oxygen concentration on the outlet 32 side. This oxygen-enriched air is transferred to the communication path 3
8 to the intake passage 10. As a result, oxygen-enriched air is supplied to the internal combustion engine 4 and combustion efficiency is increased, so that output, fuel consumption rate, etc. can be improved.

At this time, by increasing the oxygen concentration on the intake port 32 side of the oxygen concentrator 26 to generate oxygen-enriched air, the nitrogen concentration is increased on the intake port 28 side of the oxygen concentrator 26 by reducing the oxygen concentration. A residual nitrogen-enriched air is produced. This nitrogen-enriched air is supplied to the cooling fan 24 by the suction force of the cooling air flow 44a generated by the drive of the cooling fan 24 provided on the crankshaft 22 of the internal combustion engine 2 from the exhaust port 38 provided facing the cooling air flow 44a. direction, the internal combustion engine 2
is discharged together with cooling air. Thereby, nitrogen-enriched air can be discharged without providing a conventional discharge pump.

Therefore, it is possible to achieve weight reduction and cost reduction due to a reduction in the number of parts, and it is also possible to achieve an improvement in internal combustion engine operating efficiency due to a decrease in energy consumption. In addition, a cooling fan 24 provided on the crankshaft 22 of the internal combustion engine 2
A large amount of air can be supplied to the intake port 28 side by discharging nitrogen-enriched air by the suction force of the cooling air flow generated by the drive of The oxygen enrichment rate can be improved without saturation with air.

2 and 3 show a second embodiment of the invention. The feature of this second embodiment is that the exhaust port for the nitrogen-enriched air is provided in the exhaust gas flow 46a of the exhaust passage 46 through which the exhaust gas generated by the driving of the internal combustion engine 2 flows.

That is, as shown in FIG. 2, the flow rate of the main gas flow in the main gas passage 101 is G1, the pressure is Pl, the temperature is T1, and the main gas passage 1
The area of the main gas outlet 102 of 01 is Fl, the outlet 102
The flow rate of the main gas flow ejected from the secondary gas passage 103 is set to Wl, the flow rate of the secondary gas flow of the secondary gas passage 103 is set to 02, the pressure is set to P2,
The temperature is T2, the flow velocity of the secondary gas flow sucked from the mixing chamber 104 by the main gas flow ejected from the main gas outlet 102 is Wl, and the constriction part 105 provided in front of the main gas outlet 102 of the main gas passage 101 Let F be the area of the outlet 106 at the tip.

In other words, the secondary gas is sucked in by the negative pressure generated in the mixing chamber 104 by the main gas flow ejected from the main gas outlet 102 and the viscosity of the ejected main gas flow, thereby generating a secondary gas flow. become.

Therefore, as shown in FIG. 3, the exhaust passage 46 of the internal combustion engine 2
An exhaust gas outlet 48 is provided by constricting the middle of the exhaust gas outlet 48, a mixing chamber 5o surrounding this exhaust gas outlet 48 is provided, and a constriction part 52 is provided in the exhaust passage 46 in front of the exhaust gas outlet 48 to form an ejector 54. The exhaust port 32 of the oxygen enriched air device 4 is provided at Qp in the mixing chamber 50.

As a result, the nitrogen-enriched air is sucked in by the exhaust gas flow ejected from the exhaust gas outlet 48, so that it can be discharged together with the exhaust gas.

For this reason, there is no need to install a discharge pump like in the past.
Nitrogen-enriched air can be discharged, which can reduce weight and cost by reducing the number of parts and improve internal combustion engine operating efficiency by reducing energy consumption. In addition, by discharging nitrogen-enriched air by the suction force of the exhaust gas flow generated by the drive of the internal combustion engine 2, a large amount of air can be supplied to the intake port 28 side. The oxygen enrichment rate can be improved without saturating the air with nitrogen-enriched air.

Furthermore, according to this second embodiment, the air-cooled internal combustion engine 2
In addition, the present invention can be applied to general internal combustion engines 2 including liquid-cooled and water-cooled engines, so it is possible to achieve the effect of increasing versatility.

In addition, when ram pressure is obtained by opposing airflow during running, such as in a car or two-wheeled vehicle, the nitrogen-enriched air can be discharged by the opposing airflow without the need for a discharge pump.

In this case, as shown in FIG. 4, the artificial part 56 surrounds the oxygen concentrator 20 and expands toward the front in the traveling direction A of the vehicle (not shown) on which the internal combustion engine 2 is mounted. It is also possible to provide a diaphragm body 62 having an intermediate constricted portion 58 and an outlet portion 60 having a diameter smaller than that of the artificial portion 56 and expanding toward the rear in the traveling direction A of the vehicle. This throttle body 62 can further increase the ram pressure caused by the opposing airflow 62a, so nitrogen-enriched air can be discharged by the opposing airflow 62a, and a large amount of increased pressure air can be supplied to the intake port 28 side. Thereby, the oxygen enrichment rate can be improved without saturating the area around the oxygen enriched air device with nitrogen enriched air.

Furthermore, the simple configuration can further reduce weight and cost.

〔Effect of the invention〕

As described above, according to the present invention, the exhaust port of the nitrogen-enriched air that is residually generated by generating the oxygen-enriched air by the oxygen-enriched air device is made to face the airflow generated by the drive of the internal combustion engine. As a result, the nitrogen-enriched air can be discharged by the suction force of the airflow generated by the internal combustion engine without the need for a discharge pump, thereby reducing weight and cost by reducing the number of parts. It also improves the operating efficiency of the internal combustion engine by reducing energy consumption, and also supplies a large amount of air to the intake side by discharging nitrogen-enriched air using the suction force of the airflow generated by the internal combustion engine. As a result, the oxygen enrichment rate can be improved without saturating the area around the oxygen enriched air device with nitrogen enriched air.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an oxygen enriched air system for an internal combustion engine showing a first embodiment of the present invention. 2 and 3 show a second embodiment of the present invention, FIG. 2 is a theoretical explanatory diagram, and FIG. 3 is a schematic configuration diagram of an oxygen enriched air device. FIG. 4 is a schematic configuration diagram of an oxygen enriched air device showing another embodiment. FIG. 5 is a schematic diagram of a conventional oxygen-enriched air device. In the figure, 2 is an internal combustion engine, 4 is an oxygen enriched air system, 2
4 is a cooling fan, 26 is an oxygen concentrator, 28 is an intake port, 3
2 is an outlet, 34 is a suction pump, 38 is a communication path, 42
is an exhaust port, 44 is a cooling air passage, 46 is an exhaust passage, 54
is an ejector, and 62 is an aperture body.

Claims (1)

[Claims] 1. Providing the oxygen-enriched air intake port of the oxygen-enriched air device that increases the oxygen concentration of the air taken in from the air intake port to generate oxygen-enriched air and communicates with the internal combustion engine intake system, and increases the oxygen concentration. 1. An oxygen-enriched air system for an internal combustion engine, characterized in that an exhaust port for nitrogen-enriched air remaining as a result of the nitrogen-enriched air is provided facing an airflow generated by driving the internal combustion engine.