JP2010270681A - Intake device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small intake device for an engine having high oxygen enrichment treatment capacity. <P>SOLUTION: As shown in Fig.(a), when compressed air is inputted into a pressure resistant container 23 from a compressed air guide pipe 22, the outer side of an oxygen enrichment apparatus 24 becomes a high pressure. The compressed air 41 is passed through an oxygen enrichment film 38 while moving the compressed air 41 to the inside of the oxygen enrichment apparatus 24 on a low pressure side. As shown in Fig.(b), air 42 with a high oxygen concentration having passed through the oxygen enrichment film 38 enters into a high concentration oxygen storage chamber 25 via a high concentration oxygen guide path 36, and sent to a high concentration oxygen pipe 26. On the other hand, air 43 with a low oxygen concentration not passing through the oxygen enrichment film 38 is sent over the surface of the oxygen enrichment film 38, and scavenged from a low concentration oxygen guide path 33. Since the density of oxygen is increased, and the pressure difference in fore and aft of the oxygen enrichment film of the oxygen enrichment apparatus is enlarged, the oxygen enrichment treatment capacity can be improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improvement of an intake device for an engine that supplies air having a high oxygen concentration to the engine.

The engine is powered by burning fuel with oxygen in the air. As a method for improving the engine output when the volume of the combustion chamber is constant, it has been put into practical use that more air is fed into the combustion chamber by a supercharger. Or if the oxygen concentration in air becomes high, the output of an engine can be raised.
As a method for increasing the oxygen concentration of air, a technique is known that uses an oxygen-enriched membrane that separates air into air having a high oxygen concentration and air having a low oxygen concentration (see, for example, Patent Document 1 (FIG.)). .)
The technique of this patent document 1 is demonstrated below based on drawing.
As shown in FIG. 7, in the engine intake device 101, the air purified by the air cleaner 102 partially flows into the passage 104 from the supercharger 103 as indicated by the arrow (1), and the remaining portion is indicated by the arrow (2). Go straight ahead. A part of the air is sent from the supercharger 103 through the passage 104 to the oxygen enricher 106 through the valve 105 as indicated by the arrow (1). The supplied air is separated by the oxygen enricher 106 into air having a high oxygen concentration and air having a low oxygen concentration.

  The air having a high oxygen concentration is sent again to the primary side of the supercharger 103 through the passage 107 as shown by the arrow (3). On the other hand, air with a low oxygen concentration is discharged from the passage 108 to the outside as indicated by an arrow (4). On the other hand, the air indicated by the arrow (2) is mixed with the air indicated by the arrow (3), and sent to the engine 109 as indicated by the arrow (5). Compared with normal air, air having a higher oxygen concentration is sent to the engine 109, so that the combustibility of the engine 109 is improved.

  However, once a part of the air with high oxygen concentration (arrow (3)) that has passed through the oxygen enricher 106 is returned to the oxygen enricher 106 and circulated as indicated by arrow (1), the oxygen enrichment is performed. Is inefficient.

  Further, in the supercharger 103, the pressure of the air sent out is not so high and the pressure difference before and after the oxygen-enriched film 110 in the oxygen enricher 106 is small, so the processing capacity for oxygen enrichment is low. In order to increase the processing capacity of oxygen enrichment, it is necessary to increase the area of the oxygen enriched film 110, and the oxygen enricher 106 becomes large. That is, there is a demand for an intake device for an engine that is small and has a high processing capacity for oxygen enrichment.

JP-A 64-29664

  It is an object of the present invention to provide an intake device for an engine that is small and has a high processing capacity for oxygen enrichment.

  According to a first aspect of the present invention, there is provided an engine intake device that supplies air having a high oxygen concentration to an engine. The engine intake device includes an air compressor that is provided near the engine and compresses air, A pressure vessel connected to a machine for taking in the compressed air, an oxygen enricher housed in the pressure vessel and separating the compressed air into air having a high oxygen concentration and air having a low oxygen concentration, and the oxygen A high-concentration oxygen storage chamber connected to the enricher and storing separated high-oxygen-concentration air, and the high-oxygen-concentration air is guided to the intake pipe of the engine by being compressed by the air compressor. The air having a low oxygen concentration is scavenged from the pressure vessel.

  In the invention according to claim 2, the low-concentration oxygen induction path is extended from the pressure vessel, and the outlet of the low-concentration oxygen induction path is connected to the suction port of the engine fan cover, thereby sucking and exhausting air having a low oxygen concentration. It is characterized by.

In the invention according to claim 1, the intake device of the engine guides the air having a high oxygen concentration generated by the oxygen enricher to the intake pipe of the engine.
Since all the air is sent to the intake pipe of the engine without circulating high oxygen concentration air, the efficiency of oxygen enrichment is good.
In addition, the intake device of the engine sends out high-pressure air with an air compressor. Since the oxygen density is increased and the pressure difference is increased before and after the oxygen-enriched film of the oxygen enricher, the processing capacity for oxygen enrichment can be increased.
Furthermore, even if the treatment capacity for oxygen enrichment is increased, the area of the oxygen enriched film can be reduced if the pressure is high, and the engine intake device can be made smaller.

  In addition, in comparison with an intake device that supplies high oxygen concentration air and scavenges low oxygen concentration air, a pump is provided on each of the primary and secondary sides of the oxygen enricher. In the present invention, since only an air compressor is required, the configuration of the apparatus can be simplified.

  In the invention according to claim 2, the low-concentration oxygen induction path is extended from the pressure vessel, and the outlet of the low-concentration oxygen induction path is connected to the suction port of the engine fan cover so that the low oxygen concentration air is sucked and exhausted. I made it. Since air with a low oxygen concentration can be quickly discharged from the pressure vessel and new air can be sent to the pressure vessel, the efficiency of oxygen enrichment can be further improved.

It is a perspective view showing the whole engine. It is a top view which shows the intake device of an engine. It is a figure explaining the state through which oxygen passes an oxygen enriched film. It is a figure explaining the principle of oxygen enrichment in an oxygen enrichment apparatus. It is a figure explaining the effect | action of the intake device of the engine which concerns on this invention. It is a figure explaining the effect of the intake device of the engine concerning the present invention. It is a figure explaining the engine intake device which concerns on the prior art.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the engine 10 is sucked into a base 11, an engine main body 12 provided on the base 11, a fuel tank 13 provided on the upper portion of the engine main body 12. An air cleaner 14 that removes foreign matter from the air, an intake pipe 15 that guides the sucked air to the engine body 11, a carburetor 16 that vaporizes and mixes the fuel supplied to the engine body 11, and the engine body 11. A muffler 17 for reducing exhaust noise, an engine fan cover 18 serving as a cooling air intake for cooling the engine body 11, a recoil starter 19 for starting the engine 10, and air having a high oxygen concentration in the intake pipe 15. An engine intake device 20 (details will be described later).

Next, the engine intake device 20 will be described.
As shown in FIG. 2, an engine intake device 20 includes an air compressor 21 that is provided near the engine 10 and compresses air, and a compressed air induction pipe that is connected to the air compressor 21 and guides compressed air. 22, a pressure vessel 23 connected to the compressed air guide pipe 22 and taking in compressed air, and the compressed air stored in the pressure vessel 23 is separated into air having a high oxygen concentration and air having a low oxygen concentration. An oxygen enricher 24, a high-concentration oxygen storage chamber 25 for storing air with a high oxygen concentration connected to and separated from the oxygen enricher 24, and an air with a high oxygen concentration connected to the high-concentration oxygen storage chamber 25 And a high-concentration oxygen pipe 26 for guiding the gas to an intake pipe (FIG. 1, reference numeral 15).

  The driven pulley 32 is rotated via a belt or chain hung on a drive pulley 31 provided on the drive shaft 27 of the engine body 12 to operate the air compressor 21. By compressing air with the air compressor 21, air having a high oxygen concentration is guided to the intake pipe 15 of the engine 10, and air having a low oxygen concentration is scavenged from the pressure vessel 23.

  Further, the low-concentration oxygen induction path 33 is extended from the pressure vessel 23, and the outlet 34 of the low-concentration oxygen induction path 33 is connected to the suction port 35 of the engine fan cover 18, thereby sucking and exhausting air having a low oxygen concentration.

The oxygen enricher 24 is an oxygen enriched film (described later in detail) that allows oxygen to pass faster than nitrogen, and high-concentration oxygen that guides the oxygen-rich air that has passed through the oxygen-enriched film to the high-concentration oxygen storage chamber 25 And a guide path 36.
Reference numeral 37 denotes an air intake port for taking outside air into the air compressor 21.

Next, the principle of the oxygen-enriched film will be described.
As shown in FIG. 3, the air on the left side of the figure is compressed to a high pressure and the right side of the figure is set to a low pressure with the oxygen-enriched film 38 as a boundary. When a pressure difference is provided across the oxygen-enriched film 38, part of the air passes through the oxygen-enriched film 38 and moves from the high pressure side to the low pressure side.

  The component composition of the compressed air 41 on the left side of the figure is approximately 79% nitrogen and 21% oxygen. When this compressed air 41 passes through the oxygen-enriched membrane 38, oxygen passes faster than nitrogen. The component composition of the air 42 having a high oxygen concentration that has passed through the oxygen-enriched film 38 is approximately 70% nitrogen and 30% oxygen.

On the other hand, the remaining air that has not passed through the oxygen-enriched film 38 flows on the surface of the oxygen-enriched film 38. And it becomes the air 43 and 43 with a low oxygen concentration comprised by a large amount of nitrogen and a small amount of oxygen.
In the embodiment, the pressure difference between the high pressure side and the low pressure side is about 60 kPa, but other values may be used as long as there is a pressure difference such as 50 kPa or 70 kPa. The oxygen-enriched film 38 is preferably a thin film made of silicon, but other materials can be used as long as the material is oxygen-enriched.

Next, the basic principle of the oxygen enricher 24 will be described.
As shown in FIG. 4A, when compressed air is put into the pressure vessel 23 from the compressed air induction tube 22, the outside of the oxygen enricher 24 becomes high pressure. The compressed air 41 tries to move inside the oxygen enricher 24 on the low pressure side, and passes through the oxygen enriched film 38.

Then, as shown in (b), the high-oxygen air 42 that has passed through the oxygen-enriched film 38 enters the high-concentration oxygen storage chamber 25 via the high-concentration oxygen guide path 36 and enters the high-concentration oxygen pipe 26. Sent.
On the other hand, the low-oxygen air 43 that does not pass through the oxygen-enriched film 38 flows over the surface of the oxygen-enriched film 38 and is scavenged from the low-concentration oxygen induction path 33.

  For convenience of explanation, the oxygen enricher 24 has one chamber 44 surrounded by the oxygen enriched film 38, but a plurality of chambers 44 may be stacked. By stacking a plurality of chambers 44, the area of the oxygen-enriched film 38 is increased, and the efficiency of oxygen enrichment can be improved.

The operation of the engine intake device 20 described above will be described next.
In FIG. 5, the compressed air is sent from the air compressor 21 to the pressure vessel 23 as shown by the arrow (5). The compressed air passes through the oxygen enricher 24 as indicated by arrow (6). Air having a high oxygen concentration is sent to the high-concentration oxygen storage chamber 25 as indicated by an arrow (7), and is supplied to the intake pipe (FIG. 1, reference numeral 15) of the engine 10 through the high-concentration oxygen pipe.

  On the other hand, the air having a low oxygen concentration passes through the oxygen enricher 24 and exits the pressure vessel 23 as indicated by the arrow (9). The air with a low oxygen concentration discharged from the pressure vessel 23 passes through the low-concentration oxygen guide path 33 as indicated by an arrow (10), and is guided and sucked into the engine fan cover 18 as indicated by an arrow (11).

Next, the effect of the engine intake device according to the present invention will be described.
In FIG. 6, the engine intake device 120 according to the comparative example of FIG. 6A includes a pump 121 that sends air, an oxygen enricher 122, and a storage case 123 that stores the oxygen enricher 122. Yes.

The air sent out from the pump 121 enters the storage case 123 as indicated by an arrow (12). The high oxygen concentration air that has passed through the oxygen enrichment film 124 of the oxygen enricher 122 is sent to the intake pipe 126 of the engine 125 as indicated by an arrow (13).
On the other hand, the low oxygen concentration air that does not pass through the oxygen-enriched membrane 124 is discharged from the outlet of the storage case 123 as indicated by an arrow (14).

In the engine intake device 120 according to the comparative example, the air passes through the oxygen-enriched film 124, so that air having a certain high oxygen concentration can be supplied to the engine 125.
However, since the pump 121 only sends out air, the pressure difference between the outside and the inside of the oxygen-enriched membrane 124 is small. In order to send a large amount of oxygen-rich air to the engine 125, the area of the oxygen-enriched film 124 must be increased. As a result, the engine intake device 120 becomes large.

  In the engine intake device 20 according to the embodiment (b), the air compressed by the air compressor 21 is sent out as indicated by an arrow (15). The pressure difference between the outer side and the inner side of the oxygen-enriched film 38 becomes larger, and oxygen in the air that has become dense becomes easier to pass through the oxygen-enriched film 38. Air having a high oxygen concentration is supplied to the engine as indicated by an arrow (16).

On the other hand, air with a low oxygen concentration that does not pass through the oxygen-enriched film 38 is discharged from the pressure vessel 23 as indicated by an arrow (17). Since the pressure vessel 23 has a high pressure, air having a low oxygen concentration is easily discharged to the outside. Since it becomes easy to send new air from the air compressor 21, the efficiency of oxygen enrichment is improved.
Even if high-pressure air is sent from the air compressor 21, the pressure vessel 23 can maintain high pressure.
As described above, the engine intake device 20 can be reduced in size.

  Although the engine intake device according to the present invention is applied to a general-purpose engine, it can be applied to an engine of an automobile or a special vehicle, and may be used for another engine.

  The engine intake device according to the present invention is suitable for a general-purpose engine.

  DESCRIPTION OF SYMBOLS 10 ... Engine, 15 ... Intake pipe, 18 ... Engine fan cover, 20 ... Engine intake device, 21 ... Air compressor, 23 ... Pressure vessel, 24 ... Oxygen enricher, 25 ... High concentration oxygen storage chamber, 33 ... Low concentration oxygen induction path, 34 ... outlet of low concentration oxygen induction path, 35 ... inlet of fan cover, 36 ... high concentration oxygen induction path, 38 ... oxygen enriched film, 41 ... compressed air, 42 ... oxygen concentration High air, 43 ... air with low oxygen concentration.

Claims (2)

In the engine intake system that supplies air with high oxygen concentration to the engine,
The engine intake system includes an air compressor provided near the engine for compressing air, a pressure vessel connected to the air compressor for taking in the compressed air, and housed in the pressure vessel and compressed. An oxygen enricher that separates the separated air into air having a high oxygen concentration and air having a low oxygen concentration, a high concentration oxygen storage chamber that is connected to the oxygen enricher and stores the separated air having a high oxygen concentration, Consists of
An air intake apparatus for an engine, wherein the air having a high oxygen concentration is guided to an intake pipe of the engine by being compressed by the air compressor, and the air having a low oxygen concentration is scavenged from the pressure vessel.   2. A low-concentration oxygen induction path is extended from the pressure vessel, and an outlet of the low-concentration oxygen induction path is connected to an intake port of an engine fan cover, whereby air having a low oxygen concentration is sucked and exhausted. The engine intake system described.

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