JPH0441969A - Air cleaning device for internal combustion engine - Google Patents

Abstract

PURPOSE:To allow air introduced from each inlet to flow in a spiral manner within a casing and hence to effectively utilize the filtration area of a cleaner element, by forming a plurality of inlets around the inner peripheral surface of a casing internally including a cleaner element along the tangential direction of the inner peripheral surface. CONSTITUTION:Within a cylindrical casing 21, there is provided a cylindrical cleaner element 22 in such a manner as to form a gap between the same and the inner peripheral surface and to be coaxial with the casing 21. Also, there are provided first and second inlets 231 and 232 at the positions near one end of the casing 21. The first and second inlets 231 and 232 are so arranged as to be located on the straight line symmetric to the axis of the casing 21. A flow of air introduced from the first 231 is shown in a spiral locus A and a flow of air introduced from the second inlet 232 is shown as spiral locus. In this case, the spiral locuses A and B are not allowed to be crossed to each other, to thereby form a double locus therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cyclone-type air cleaning device that cleans air taken into an engine.

[Prior Art] A cyclone type air cleaner is known as an air cleaner that cleans intake air that is supplied to an engine. FIG. 5 shows a conventional cyclone air cleaning device, which includes a cylindrical casing 11, and a cylindrical cleaner element 12 is arranged inside the casing 11 so that its axis coincides with that of the casing 11. ing. An inlet 13 that opens into the inside of the casing 11 is formed on the circumferential surface in the direction of one end of the casing 11, and intake air is introduced from this inlet 13 in a tangential direction to the inner circumferential surface of the casing 11. , air is delivered along the inner peripheral surface of the casing If. The air introduced into the casing 11 is outputted from an outlet 14 formed on the end face of the casing 11, and is supplied to an engine (not shown).

Here, the flow of air sent from the inlet 13 and formed within the casing 11 forms a single spiral as shown by A in the figure, and flows between the casing 11 and the cleaner element 12. flows. In this case, the air flow velocity is set in accordance with the intake air amount in the engine, but as this air flow velocity increases,
The flow of dust contained in this air also becomes a clear spiral flow. This makes it impossible for the dust to be dispersed throughout the airflow. Therefore, the dust sucked into the cleaner element 12 in such a state is trapped only in a very limited part of the element 12, that is, in the dust spiral trajectory part.

In such a state, the filtration area of the cleaner element I2 cannot be used effectively, and this element 12
This may cause premature clogging.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and it effectively utilizes the filtration area of the cleaner element installed in the casing, and particularly solves the problem of early clogging in the cleaner element. It is an object of the present invention to provide an air cleaning device for an internal combustion engine that can effectively suppress air pollution and extend its useful life.

[Means for Solving the Problems] An air purifying device for an internal combustion engine according to the present invention includes a cleaner element coaxially installed inside a cylindrical casing, and a cleaner element located near one end of the casing. A plurality of inlets are formed at positions symmetrical to the axis of the casing and oriented in a direction tangent to the inner circumferential surface of the casing. In addition, the plurality of inlets are appropriately provided with drift plates.

[According to the air purifying device for an internal combustion engine configured in this way,
Intake air is introduced into the casing from a plurality of inlets arranged axially symmetrically.

The air introduced from each inlet flows in a spiral trajectory within the casing, and the multiple inlets are positioned symmetrically with respect to the axis of the casing. Because they are installed at equal intervals in the circumferential direction, the position of the spiral trajectory of the airflow differs for each inlet, making it possible for dust to be concentrated and captured at specific points on the cleaner element. It disappears.

Therefore, the progress of clogging of the cleaner element is suppressed. In addition, as the engine speed increases, the airflow speed increases, and the number of inlets that can be used when the airflow speed is higher is increased by the deflection plate installed in each inlet. By doing so, it is possible to obtain an air purifying device that operates more efficiently.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows its configuration, with a cylindrical casing 2
1, a cylindrical cleaner element 22 is set coaxially with the casing 21, with a gap formed along the inner circumferential surface of the casing 21. Then, at a position close to one end portion of the casing 21,
First and second inlets 231 and 232 are provided, and the air introduction directions of these inlets 231 and 232 are set parallel to the tangent to the inner peripheral surface of the casing 21, and the air is introduced from the inlets 231 and 232. The airflow is rotated along the inner peripheral surface of the casing 21 to form a spiral trajectory. Here, the first and second inlets 231 and 2
32 is located on one diameter line that is symmetrical to the axis of the casing 21 .

That is, the intake air introduced from the inlets 231 and 232 flows along the inner peripheral surface of the casing 21 as shown by spirals A and B in the figure, and from the outlet 24 formed on the other end surface of the casing 2, The air is then guided to the engine's intake system, which is not shown in the diagram.

That is, in the air purifying device configured in this way, the first and second inlets 231 and 232 are
They are respectively set at positions symmetrical to the axis of the cylindrical casing 21. Therefore, with respect to the spiral trajectory A of the air flow introduced from the first inlet 231, the spiral trajectory B of the air introduced from the second inlet 232 is formed in the gap between the trajectory A. become,
Trajectories A and B come to form a double helix.

As a result, the distribution of the dust sucked into the cleaner element 22 becomes wide, and therefore, the unused portion of the filtration area is inevitably reduced, and this filtration area is effectively utilized. That is, cleaner element 2
2, the premature clogging can be effectively suppressed, and the lifespan of the air purifier can be effectively extended.

In particular, the inlets 231 and 232 are
Since the cleaner element 22 is installed at a symmetrical position with respect to the axis of the cleaner element 22, and in particular is set at a point-symmetrical position, the filtration area of the cleaner element 22 can be used evenly and efficiently.

Figure 2 shows the case a when there is one inlet as shown in Figure 5;
The results of an experiment to determine the degree of dust clogging in the case where two inlets are set as shown in FIG. 1 are shown. This experiment was conducted according to JIS D 1612.
As an example of the test termination condition, the time point when the increased resistance reached 600 mmAq was taken as an example. As a result of this experiment, it was confirmed that the life span in case b, in which there were two inlets, was approximately 1.2 times longer than in case a, in which inlet was in one place.

In the above embodiment, two inlets 231 and 232 are provided for the casing 21, but the number of inlets can be increased arbitrarily. For example, as shown in FIG. 3, first to third inlets 231 to 233 may be formed at positions symmetrical to the axis of the casing 21. In this case as well, since the intervals between the first to third inlets 231 to 233 are equal, the flow of air containing dust forms three spiral trajectories, and the interval between each spiral is are considered to be in an equal state.

Therefore, the filtration area of the cleaner element 22 can be used more effectively.

FIG. 4 shows yet another embodiment, in which the first and second two
Inlets 231 and 232 are provided. In this case, the first inlet 231 and the second inlet 232 are provided with flow deflection plates 30 and 31, respectively, and each is attached to be rotatable about the junction between the inlet and the casing 21 as a fulcrum. In this case, the deflection plate 30 corresponding to the first inlet 231 is set to be always open, whereas the deflection plate 31 of the second inlet 232 is selectively closed by the actuator 33 and is kept open. I'm trying to keep it under control.

That is, a rotation sensor 35 is installed corresponding to the rotation axis of the engine 34 to which air is supplied from the outlet 24 of this air purifying device, the rotation speed of the engine 34 is detected by the detection circuit 36, and the detection signal is used to activate the solenoid valve. Controls the opening and closing of 37. This solenoid valve 37 has a vacuum tank 38.
The vacuum pressure set in the actuator 33 is controlled by opening and closing the solenoid valve 37. For example, when it is detected that the rotation speed of the engine 34 has risen above a predetermined value, the second The deflection plate 31 of the inlet 232 is opened so that air from this second inlet 232 is introduced into the inside of the casing 21.

The second inlet 232 is opened in accordance with the rotation speed of the engine 34, and when the amount of intake air is low, specifically when the engine 34 is in a low rotation range, the second inlet 232 is opened in accordance with the rotation speed of the engine 34. Only the inlet 231 is opened. By doing so, the flow rate of the intake air can be increased, and the cyclone effect in this air cleaning device is improved.

In addition, when the rotational speed of the engine 34 increases and the amount of intake air is high, the second inlet as well as the first inlet 231
The inlet 232 of the cleaner element 2 is also opened to reduce pressure loss and disperse the dust flow.
The filtration area of 2 can be used more effectively, and its life can be effectively extended.

The control of the drift plate 31 installed in the second inlet 232 is not limited to the one in which the rotational speed of the engine 34 is detected and performed in response to the detection result as shown in the embodiment, for example. It is also possible to configure the intake air amount or the negative pressure in the intake pipe to be detected and controlled.

[Effects of the Invention] As described above, according to the cyclone air cleaning device for an internal combustion engine according to the present invention, the passage for intake air containing dust is formed in a state where it is evenly distributed with respect to the cleaner element. This makes it possible to use the filtration area of this element more effectively, effectively extending its life.

In addition, by controlling the number of inlets according to the engine operating conditions, the cyclone effect is improved in low intake air flow conditions, and the air purification function is also stabilized and set. Become so.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the configuration of an air cleaning device according to an embodiment of the present invention, FIG. 2 is a diagram showing the state of clogging in the cleaner element in comparison with a conventional example, and FIG. FIG. 4 is a diagram showing the second embodiment, FIG. 4 is a diagram similarly explaining the third embodiment, and FIG. 5 is a diagram showing a conventional air cleaning device. 21...Casing, 22...Cleaner element, 231-233...Inlet, 24...Outlet, 30.31...Blank plate applicant's representative Patent attorney Takehiko Suzue Figure 4, Figure 3 Figure 5

Claims (2)

[Claims] (1) a cylindrical casing; a cleaner element disposed inside the casing so that the same central axis as that of the casing; and a plurality of inlets for introducing intake air between the casing and the cleaner element, and the plurality of inlets are axially symmetrical and arranged at equal intervals with respect to the axis of the casing. An air purifying device for an internal combustion engine characterized by: (2) The plurality of inlets are selectively provided with drift plates that open and close the air passages, and these drift plates are selectively controlled to open and close in accordance with the amount of air taken into the engine. The air cleaning device for an internal combustion engine according to claim 1.