JPH0315814Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This proposal is mainly used to clean particulate matter and water droplets contained in the air before the air cleaner for purifying the intake air of the engine mounted on the road vehicle such as a truck. Regarding the pre-cleaner, which separates and eliminates air cleaner clogging and extends the life of the air cleaner, more specifically, it includes a vertical duct with a raised air intake to suck in air with less airborne dust, and a The present invention relates to a precleaner that is integrated with a duct and is combined with a means for separating and removing particulate matter and water droplets contained in the air. [Prior Art] Most of the precleaners used in the past are of the centrifugal type, and there are those that are used in conjunction with the pre-air cleaner, and centrifugal air cleaners that have the precleaner built into the casing. There is. For road vehicles such as trucks, a centrifugal separation type with a built-in precleaner has been adopted because it has many advantages over a precleaner that is used in combination with an air cleaner, such as easier handling and a reduction in the number of parts. There are many things. In this case, the tower-mounted engine is usually located and mounted at a location lower than the driver's cab, so the accompanying air cleaner is also located at a lower location. The mainstream is one that extends upwards and is taken in from the top. [Problems to be solved by the invention] In vehicles such as trucks, the space occupied by the engine and air cleaner installed under the driver's cab is relatively large. will be affected and constrained by its size. Although a centrifugal air cleaner with a built-in precleaner has the above-mentioned advantages, it has a larger volume than an air cleaner that uses a separate precleaner, which is disadvantageous in limited spaces. If the volume of the air cleaner is smaller, the fuel tank can be made larger, which is advantageous for vehicle operation.Recently, air cleaners that use a separate pre-cleaner installed outside the space under the driver's cab have been reconsidered. I'm getting old. However, in order to minimize the distance between the driver's cab and the adjacent loading platform, the duct that rises behind the driver's cab often has a flat cross-sectional shape. In this case, since the duct is of a flat type in order to use a separate pre-cleaner together, it is difficult to use a centrifugal pre-cleaner due to the swirling flow due to its shape. Conventionally, there is an example of a cleaner that separates and removes particulate matter contained in intake air using an inertial separation type device using a louver, but it is relatively large and requires an air extraction means to remove the separated particulate matter. or,
There are many disadvantages such as an increase in the number of parts due to piping, etc., and therefore an increase in price, and the reality is that even if it can be applied to a flat type, it cannot be easily adopted as a precleaner. [Means, effects, and examples for solving the problem] The present invention utilizes a flat type of duct that stands up,
The purpose is to provide a new type of pre-cleaner suitable for practical use, which is a louver-type pre-cleaner with a louver inside, which eliminates many of the disadvantages mentioned in the example above, and is also effective in preventing water droplets. That is. A plurality of elongated air inlets are arranged at regular intervals vertically, extending across the slope to near both ends of the wall plate, which is tilted downward to narrow the passage for the intake air flow. An inverted louver is formed by installing a blade plate on the back side that extends upward from the lower edge and extends to about the height of the upper edge. The air enters in reverse along the plate, but the particulate matter mixed in with the air is separated by descending due to inertia, and the intake air is passed through a relatively small straight-flow type cyclone tube as a means of extracting it by extraction. The air purified by centrifugation is extracted as a tributary stream, and the air purified by centrifugation joins the main stream purified by the louvers.The centrifuged particulates reach the dust collection chamber through the introduction path, and are then collected under the dust collection chamber. The automatic discharge valve at the end of the cylinder is linearly blocked by the negative pressure caused by the bleed air, and the elastic body opening/closing valve part automatically closes when the bleed air is released due to the suction being stopped. The structure is such that it is opened and discharged. In addition, if fine water droplets are included in the clean (primary purified) air that has passed through the louver, they will ride the airflow and fall after colliding with the inner wall of the duct, but these will be removed by the circumferential groove formed by the vertical duct and the small duct. By installing a double duct structure for receiving and discharging to the outside, it is effective in separating and eliminating particulate matter contained in the intake air and also preventing the intrusion of water droplets. A more detailed explanation will be given below with reference to the drawings. FIG. 1 shows the front side of a truck 10 equipped with a precleaner 20 of the present invention. In order to raise the suction chamber air intake 15 for the engine and air cleaner (both not shown) installed below the driver's cab 11, the duct 13 is routed through the conduit 12 to the ceiling 16 along the back of the driver's cab 11. It extends to the vicinity and is supported by a pair of clamps 18 and 19 in order to securely hold it on the rear wall 17, and a rain protection cap 14 fitted at the tip is equipped with a coarse mesh. There is a covered downward air intake 15. The duct 13 has a flat cross-sectional shape in order to reduce the distance between it and the rear adjacent loading platform (not shown), but the present invention takes advantage of the fact that it has a sufficient height in addition to this flat shape. Thus, a special precleaner 20 integrated with the duct 13 is constructed. FIG. 2 shows an embodiment of the present invention, showing a longitudinal cross-sectional view, and FIG. 3 shows a perspective view of the longitudinal cross-section. A thin plate inclined wall 22 having the same width as the inner wall is provided downward from near the upper end of one long side 13-1 of the inner wall of the flat duct 13 which also serves as the casing of the breech cleaner 20, and the lower end thereof forms an elongated open gap 23. There is. Particulate matter is separated from the inclined wall 22 by a louver 24 made of a plurality of blades configured to reverse the descending airflow until it almost becomes a reverse flow, and the purified air that has passed through the louver 24 is It descends inside the duct 13. When the vehicle is traveling during rain, the purified air that has passed through the louver 24 is likely to be mixed with the mist-like fine water droplets 25 . If this enters the air cleaner, it causes various damage such as moisture absorption and deformation of the element paper, early clogging due to adhesion of dust, and rusting of the constituent metal parts. This invention not only separates and eliminates particulate matter, but also removes fine water droplets that are mixed into the purified air that has passed through the louver.
5, a partition wall 2 is installed at a position lower than twice the depth to the end of the inclined wall 22.
A circumferential groove 27 is formed by providing an inner duct 13-3 that rises up from the partition wall 26 to some extent and has a gap between it and the inner wall of the duct 13 to maintain uniformity all around, thereby forming a circumferential groove 27. A small hole 2 is placed at an arbitrary position on the outside to communicate with the outside of the duct 13.
8 will be provided. The fine water droplets 25 mixed into the purified air passing through the louver 24 collide with the inner wall of the duct 13 - 1 , collect, gradually grow into larger droplets, descend along the inner wall, and reach the circumferential groove 27 . The water droplets thus caught are discharged to the outside of the duct 13 through the small holes 28. On the other hand, the particulate matter separated by inertia without passing through the louvers 24 is discharged by bleed air, which is separated from the purified air flow by the louvers at the bottom of the intermediate chamber 30 separated by the partition wall 29. By inhaling the air as a tributary of the intake air through a relatively small straight-flow type cyclone tube 31 fitted therein, the air flows through the open gap 23 to the intermediate chamber 30, and after being centrifugally separated again, it enters the introduction path 32. The cylindrical body 3 is guided and connected to the dust collection chamber 33 and its lower side.
However, when the suction negative pressure is released by stopping the engine operation, the automatic discharge valve 35 opens due to its elasticity and is automatically discharged. FIG. 4 shows a longitudinal cross-sectional view of a modified embodiment of the present invention, and FIG. 5 shows a perspective view of the longitudinal cross-section. The differences from those shown in Figures 2 and 3 are as follows:
This outer configuration is achieved by adopting a louver configuration made of two plates, in which thin plate inclined walls 42 having a flat cross-sectional shape and the same width as the inner wall on the short side are attached facing each other downward from near the upper ends of both sides of the short side.・The effect is the same as 1 above.
This is the same as the structure using a single plate. [Effects of the invention] (1) The present invention uses a pre-cleaner combination type for the air cleaner normally placed below the driver's cab 11 in vehicles such as the truck 10 shown in Fig. Since the size can be made smaller even if the excess area is the same, the fuel tank 21 can be made larger by that amount when disposed in the same space, and the volume increases, which is advantageous for running the vehicle. (2) Utilizing the shape of the duct 13, which has a flat cross-sectional shape and extends vertically upward, the precleaner 20 is integrated with it, so a separate precleaner is installed at the entrance of the duct 13 along with the cap 14. The equipment is simpler than if you do it. (3) The air containing particles that has been inertially separated by the louver 24 is transferred to the straight flow type cyclone tube 3.
1, the air is extracted within the duct 13 as a tributary of the intake air, which is extremely simple, and the number of piping, joint parts, etc. can be reduced compared to conventional air extraction means such as the case where air is extracted using an engine exhaust system. (4) Table 1 shows the values obtained by comparing the performance of the precleaner according to the present invention shown in FIG. 2 and the precleaner built into a conventional centrifugal air cleaner under the same conditions. Looking at this, it can be seen that the product of the present invention is slightly inferior in dust separation efficiency and ventilation resistance compared to the conventional product, but the water separation efficiency is much better, and it has an excellent effect on water droplet control. The various problems caused by water intrusion mentioned above can be eliminated, and in a comprehensive comparison, it can be said that the invention according to the invention is suitable for practical use in the case of moving vehicles such as trucks.

[Table] Note: The inventive type is based on the embodiment shown in Figure 2.
As explained above, the present invention has been described in detail based on examples as a new precleaner that exhibits many effects in terms of structure and performance. It goes without saying that it can be done.

[Brief explanation of the drawing]

FIG. 1 is a front side view of a truck equipped with the precleaner of the present invention, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. FIG. 3 is a vertical cross-sectional perspective view thereof. FIG. 4 is a longitudinal sectional view of a modified embodiment of the present invention. FIG. 5 shows a vertical cross-sectional perspective view thereof. 10... Truck, 11... Cab, 13...
Duct, 14...cap, 15...air intake, 17...rear wall, 20...precleaner,
21... fuel tank, 22... inclined wall, 24...
Louver, 26... Partition wall, 27... Peripheral groove, 2
8... Small hole, 29... Partition wall, 30... Intermediate chamber, 3
1... Cyclone Yub, 33... Dust collection room, 34
... Cylindrical body, 35 ... Automatic discharge valve, 42 ... Inclined wall.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A vertical duct for raising the air intake of an air cleaner, the cross-sectional shape of which is rectangular and flat, adjacent to the upper end of the inner wall on one of the long sides. A thin sloped wall with the same width as the inner wall on the long side is installed downward from this position, and the flow path is narrowed so that the lower end becomes a slightly elongated open gap. An inverted louver is formed by arranging a plurality of air inlets at regular intervals vertically, and providing a blade on the back side of each inlet that slopes upward from the lower edge and extends to about the height of the upper edge. However, the air that enters from the intake port and descends is suctioned and enters from each inlet port along the blade plate, but the particulate matter mixed in the air is separated by descending due to inertia. (b) A small louver with a cross-sectional shape that is relatively smaller than that of the vertical duct and a height that is about the same as the short side of the vertical duct, at a position lower than the lower end of the louver to a predetermined depth. The duct is different from a vertical duct in that the outer circumference of the lower end of the small duct is connected to the inner circumference of the vertical duct by a horizontal partition wall so as to maintain a uniform gap all around the circumference, and the uniform gap and partition wall are connected to the bottom of the duct. (c) a water removal means configured by providing small holes at arbitrary positions around the vertical duct so that the deepest part of the circumferential groove formed as a groove communicates with the outside air; The passage of the air flow containing particulate matter descending through the open gap is separated from the purified intake air flow that has passed through the louver by a partition wall. A straight flow type cyclone tube is opened and installed so that air can be extracted by the intake airflow; The small duct is opened at the upper part of the small duct to extract air to the intake airflow, while the particulate matter after reseparation passes through the tube outer shell, passes through the introduction path connected to the outer shell, and is collected adjacent to the outer wall of the vertical diameter duct. The elastic opening/closing valve part, which is fitted to the end of the cylinder that leads to the dust chamber and continues to the bottom of the dust collection chamber, was linearly blocked by the negative pressure caused by the bleed air, but when the bleed air was released by stopping the suction, the valve part A precleaner integrated with a flat duct, comprising an automatic discharge valve that automatically opens to discharge accumulated particulate matter.