JP2019085907A - Air cleaner with pre-cleaner - Google Patents

Abstract

To provide an air cleaner with pre-cleaner capable of improving the separation efficiency of foreign matters from a pre-cleaner.SOLUTION: An air cleaner with pre-cleaner 11 includes a housing 14 having an inlet 12 and an outlet 13, a filter element 15 arranged in the housing 14 for filtering intake air introduced from the inlet 12, and a pre-cleaner 17 arranged at a position in the housing 14 on the further upstream side in the flowing direction of the intake air than the filter element 15 for removing foreign matters 16 included in the intake air, the pre-cleaner 17 including a swirl part 27 for swirling the intake air introduced into the inlet 12, a collection part 28 for collecting the foreign matters 16 centrifugally separated from the intake air swirled by the swirl part 27, and a communication part 36 provided on the external of the collection part 28 for communicating the collection part 28 with a position in the housing 14 on the further downstream side in the flowing direction of the intake air than the collection part 28.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air cleaner with a precleaner disposed, for example, in an intake passage of a vehicle-mounted internal combustion engine.

  Conventionally, as an air cleaner with a precleaner of this type, for example, the one shown in Patent Document 1 is known. Such an air cleaner with a precleaner has a box-like lower case having an inlet, an upper case having an outlet to which a duct from the internal combustion engine side is connected, an opening of the lower case, and an upper case facing the opening. And a dust cup disposed in a dust cup accommodating portion provided at the lower end of the lower case.

  The inlet includes an outer cylinder and an inner cylinder disposed inside the outer cylinder. The tip of the outer cylinder is provided with a wing for generating a swirling flow in the intake air flowing into the inlet. The proximal end of the outer cylinder is attached to the middle portion of the inner cylinder via an annular partition wall. The partition wall is formed with a hole communicating the space portion between the inner cylinder and the outer cylinder and the dust cup accommodating portion.

  Then, when the intake pipe negative pressure is generated by the engine operation, the intake including the foreign matter (dust) flows toward the inside of the lower case while being swirled by the wing. At this time, a relatively large foreign substance is centrifugally separated by the swirling flow of the intake air, and is fed from the space portion between the inner cylinder and the outer cylinder into the dust cup disposed in the dust cup housing. The foreign matter fed into the dust cup is discharged to the outside of the air cleaner when the dust control valve provided at the bottom of the dust cup opens due to vehicle vibration or the like.

JP 2005-330826 A

  By the way, in the air cleaner with precleaner as described above, since the dust collection valve is normally closed, air does not flow earlier than the dust cup. For this reason, the strength of the air flow for sending the foreign matter into the dust cup is insufficient, and there is room for improvement in improving the separation efficiency of the foreign matter in the precleaner.

  The present invention has been made in view of the problems existing in such prior art. An object of the present invention is to provide an air cleaner with a precleaner which can improve the separation efficiency of foreign matter in the precleaner.

Hereinafter, the means for solving the above-mentioned subject and its operation effect are described.
An air cleaner with a precleaner that solves the above problems includes: a housing having an inlet and an outlet; a filter element disposed in the housing for filtering intake air introduced from the inlet; and an intake air from the filter element in the housing And an air cleaner provided with a precleaner including a precleaner disposed at an upstream position in the flow direction to remove foreign substances contained in the intake, the precleaner swirls the intake introduced into the inlet. A rotating portion, a collecting portion for collecting the foreign matter centrifugally separated from the intake air which is turned by the rotating portion, and an external portion of the collecting portion, wherein the collecting portion and the collecting portion in the housing receive air Providing a communicating portion communicating with the downstream position in the flow direction of And effect.

  According to this configuration, the collecting portion and the downstream position in the flow direction of the intake air in the housing are communicated with each other by the communicating portion, and therefore, the foreign matter centrifugally separated from the intake air swirled by the swirling portion The air feeding the air into the collecting section is sucked by the negative pressure in the housing. For this reason, since the flow (air flow) of the said air is strengthened, the separation efficiency of the foreign material in a pre-cleaner can be improved.

  According to the present invention, the separation efficiency of foreign matter in the precleaner can be improved.

The cross-sectional schematic diagram of the air cleaner with a precleaner in one Embodiment. The cross-sectional schematic diagram of the air cleaner with a precleaner of a modification.

Hereinafter, an embodiment of an air cleaner with a precleaner disposed in an intake passage of a vehicle-mounted internal combustion engine will be described with reference to the drawings.
As shown in FIG. 1, the air cleaner 11 with precleaner has a housing 14 having an inlet 12 and an outlet 13, a filter element 15 disposed in the housing 14 for filtering intake air introduced from the inlet 12, and And a precleaner 17 for removing foreign matter 16 contained therein.

  The housing 14 is made of synthetic resin and includes a box-like case 18 having an inlet 12 and a box-like cap 19 having an outlet 13. A filter element 15 is disposed between the case opening 20 formed in the upper part of the case 18 and the cap opening 21 formed in the lower part of the cap 19 facing the case opening 20.

  The filter element 15 has a filter portion 22 formed by folding a filter medium sheet such as non-woven fabric or filter paper, and an annular seal portion 23 provided on the periphery of the filter portion 22. The seal portion 23 is formed of an elastic member such as polyurethane of closed cell. The filter element 15 is sandwiched between the case 18 and the cap 19 at the seal portion 23.

  The case 18 is fixed in the engine room of the vehicle. The case 18 and the cap 19 are connected by a clamp or the like (not shown) while holding the seal portion 23 of the filter element 15. A cylindrical outlet 13 to which a duct (not shown) from the engine side is connected is integrally formed on the side of the cap 19. An inlet 12 is integrally formed on the side of the case 18 opposite to the outlet 13 side.

  The inlet 12 includes an outer cylinder 25 and an inner cylinder 26 disposed inside the outer cylinder 25 so as to have the same axis as the axis of the outer cylinder 25. The length of the outer cylinder 25 in the present embodiment is set to be about twice as large as the length of the inner cylinder 26. At the tip of the outer cylinder 25 is provided a pivoting portion 27 for pivoting the intake air introduced into the outer cylinder 25 (inlet 12). At a position corresponding to the tip of the inner cylinder 26 at the lower side of the peripheral wall of the outer cylinder 25, a collecting unit 28 is provided for collecting the foreign matter 16 which is centrifugally separated from the suctioned air by the turning unit 27.

  The collecting portion 28 includes a cylindrical collecting case 29 made of a hard synthetic resin in communication with the inside of the outer cylinder 25, and a dust collecting valve 30 formed of an elastic body such as rubber attached to the lower end of the collecting case 29. Is equipped. The dust collection valve 30 has a bellows part 31 whose upper part is formed in a bellows shape, and a lip part 32 whose lower part is formed in a taper shape. At the tip of the lip portion 32, a slit 33 for discharging the foreign matter 16 is formed. The dust control valve 30 is adjusted in rigidity such that the slit 33 is opened by elastic deformation due to vibration of the vehicle or the like, and the foreign substance 16 inside is discharged to the outside.

  A cylindrical first connection portion 34 communicating the inside and the outside of the collection case 29 is provided on the side portion of the collection case 29 so as to protrude to the outside. A cylindrical second connection portion 35 communicating the inside and the outside of the cap 19 is provided at a position adjacent to the lower side of the outlet 13 on the side portion of the cap 19 so as to protrude to the outside. The first connection portion 34 and the second connection portion 35 communicate with each other by a flexible tubular communication portion 36.

  In this case, one end side of the communication portion 36 is connected to the first connection portion 34, and the other end side is connected to the second connection portion 35. That is, the communication unit 36 is provided outside the collection unit 28 and outside the housing 14, and the inside of the collection unit 28 and the downstream position of the suction unit in the housing 14 in the flow direction of the intake It is in communication. The communication portion 36 of the present embodiment is formed of a rubber hose, and is located at a position downstream of the filter element 15 in the collection portion 28 and in the housing 14 in the flow direction of the intake air and along the mainstream of the intake air in the housing 14. It communicates with the position.

  At a midway position of the communication portion 36, a separation portion 37 for separating the foreign matter 16 from the intake air flowing in the communication portion 36 is provided. The separation unit 37 includes a rectangular parallelepiped separation case 38 and a separation filter element 39 provided in the separation case 38 so as to divide the space in the separation case 38 into two.

  On the both side walls of the separation case 38 sandwiching the separation filter element 39, cylindrical separation connection parts 40 communicating the inside and outside of the separation case 38 are respectively provided so as to protrude to the outside. In this case, one of the two separation connections 40 is located upstream of the separation filter element 39 in the flow direction of intake air in the communication portion 36, and the other is separation in the flow direction of intake air in the communication portion 36 It is located downstream of the filter element 39.

  The separation unit 37 according to the present embodiment disconnects the communication unit 36 into two at an intermediate position, and connects and disconnects the two separation connection units 40 to the two cut-off units in the communication unit 36, respectively. It is attached freely. In the present embodiment, the precleaner 17 is configured by the turning portion 27, the collecting portion 28, the communicating portion 36, and the separating portion 37.

Next, the operation of the air cleaner 11 with precleaner will be described.
When a negative pressure is generated on the engine side due to the start of the engine, the intake air including the foreign matter 16 is introduced into the outer cylinder 25 while being swirled by the swirling portion 27. The intake air including the foreign matter 16 introduced into the outer cylinder 25 goes into the case 18 while being swirled along the inner peripheral surface of the outer cylinder 25. At this time, relatively large foreign matter 16 contained in the intake air is centrifugally separated by the swirling flow of intake air, and enters between the inner cylinder 26 and the outer cylinder 25.

  The foreign material 16 that has entered between the inner cylinder 26 and the outer cylinder 25 is fed into the collection unit 28 by the air flowing from the inside of the outer cylinder 25 toward the inside of the collection unit 28. At this time, since the communication unit 36 communicates the inside of the collection unit 28 and the relatively low pressure position near the outlet 13 in the cap 19, the air flowing from the inside of the outer cylinder 25 toward the inside of the collection unit 28 is a cap It is sucked by the negative pressure in 19. For this reason, the flow of air (air flow) from the inside of the outer cylinder 25 toward the inside of the collection unit 28 is strengthened, so that a relatively large foreign object 16 is efficiently separated from the intake including the foreign object 16 into the collection unit 28.

  In this case, the relatively large foreign matter 16 may collect in the dust collection valve 30 in the collection unit 28, but may enter the communication unit 36. The relatively large foreign matter 16 entering the communicating portion 36 is filtered and separated by the separation filter element 39 of the separation portion 37. For this reason, the separation portion 37 effectively suppresses the entry of the relatively large foreign matter 16 into the cap 19 from the inside of the communication portion 36.

  The relatively large foreign material 16 collected in the dust collection valve 30 in the collection unit 28 is slit by opening and closing the slit 33 of the lip portion 32 due to the elastic deformation of the dust collection valve 30 due to the vibration during traveling of the vehicle or the mass of the foreign material 16 It is automatically discharged from 33.

  Further, the intake air containing relatively small foreign matter 16 after centrifugally separated relatively large foreign matter 16 in outer cylinder 25 is filtered by filter element 15 in the process from inside case 18 to inside of cap 19, and then the outlet. It is supplied from 13 to the engine side.

According to the embodiment described above, the following effects are exhibited.
(1) In the air cleaner 11 with precleaner, the precleaner 17 includes a pivoting portion 27, a collecting portion 28 which collects foreign matter 16 centrifuged off from the intake air which is swirled by the pivoting portion 27, a collecting portion 28 and a housing 14. And a communication portion 36 communicating with a position downstream of the filter element 15 in the flow direction of the intake air. Generally, the pressure in the housing 14 is lower toward the downstream side in the flow direction of the intake air. In this respect, according to the above configuration, the communicating portion 36 communicates with the inside of the collecting portion 28 and the relatively low pressure position in the housing 14 (the position near the outlet 13 in the cap 19). The negative pressure in the housing 14 efficiently sucks in the air that feeds the foreign matter 16 centrifugally separated from the intake air swirled into the collection unit 28. Therefore, the flow of air (air flow) for sending the foreign matter 16 in the inlet 12 into the collection unit 28 can be intensified, so that the separation efficiency of the foreign matter 16 in the precleaner 17 can be improved.

  (2) In the air cleaner 11 with precleaner, the communicating portion 36 is provided with the separating portion 37 for separating the foreign matter 16 from the intake air flowing in the communicating portion 36. Therefore, the separating unit 37 can suppress the foreign matter 16 in the collecting unit 28 from entering the inside of the cap 19 (the inside of the housing 14) through the communication unit 36.

  (3) In the air cleaner 11 with precleaner, the separation unit 37 includes the separation filter element 39. Therefore, the separation filter element 39 can effectively suppress the foreign matter 16 from entering the inside of the cap 19 (the inside of the housing 14) through the communication portion 36. In this case, since the foreign matter 16 which is going to enter the inside of the cap 19 (the inside of the housing 14) through the communication part 36 is relatively large, a coarser one is adopted as compared with the filter element 15 in the housing 14. be able to.

  (4) In the air cleaner 11 with precleaner, the separation unit 37 is detachably attached to the communication unit 36. Therefore, the separation unit 37 can be easily replaced.

(Modification example)
The above embodiment may be modified as follows.
As shown in FIG. 2, the second connection portion 35 may be provided on the side portion of the case 18 and the separation portion 37 may be omitted. That is, the communication portion 36 may communicate the inside of the collection portion 28 with the position (in the case 18) upstream of the filter element 15 in the flow direction of intake air in the housing 14. In this way, even when the foreign matter 16 enters the case 18 from the inside of the collection unit 28 through the communication unit 36, the foreign matter 16 is captured by the filter element 15. For this reason, since it is not necessary to provide the separation part 37 for separating the foreign material 16 in the communication part 36, the configuration of the communication part 36 can be simplified. The second connection portion 35 communicates with a position (a position with as low a pressure as possible) as close as possible to the outlet 13 on the upstream side in the flow direction of intake air than the filter element 15 in the case 18 and the inside of the communication portion 36 It is preferable to arrange as follows.

In the separating portion 37, a mesh member (grid member), non-woven fabric, cotton or the like may be used instead of the separation filter element 39.
The separation unit 37 may be provided at a plurality of locations in the communication unit 36.

The separating unit 37 may be omitted.
The separation unit 37 may be configured such that the separation case 38 can be divided into two so that only the separation filter element 39 can be replaced.

  In place of the separation unit 37, a filter or a baffle may be provided in the collection unit 28, and the filter or the baffle may suppress the entry of the foreign matter 16 from the inside of the collection unit 28 into the communication unit 36.

The inlet 12 may be partially disposed in the case 18 and the collecting unit 28 may be provided in the case 18.
The communicating portion 36 does not have to be flexible, and may be made of, for example, a hard synthetic resin.

The thickness of the wall of the housing 14 may be increased, and a part of the communication portion 36 may be provided on the wall of the housing 14.
The inlet 12 may be integrally formed on the same side as the outlet 13 side of the case 18.

  The air cleaner 11 with the precleaner does not necessarily have to be an air cleaner with the precleaner of the on-vehicle internal combustion engine mounted in the engine room of the automobile. That is, the air cleaner 11 with precleaner may be used for devices other than a vehicle-mounted internal combustion engine.

  11: Air cleaner with precleaner, 12: inlet, 13: outlet, 14: housing, 15: filter element, 16: foreign matter, 17: precleaner, 18: case, 19: cap, 20: case opening, 21: cap opening , 22: filtration part, 23: seal part, 25: outer cylinder, 26: inner cylinder, 27: swivel part, 28: collection part, 29: collection case, 30: dust valve, 31: bellows, 32: lip Part, 33 ... Slit, 34 ... first connection part, 35 ... second connection part, 36 ... communication part, 37 ... separation part, 38 ... separation case, 39 ... separation filter element, 40 ... separation connection part.

Claims (5)

A housing having an inlet and an outlet;
A filter element disposed in the housing for filtering intake air introduced from the inlet;
A precleaner disposed at a position upstream of the filter element in the flow direction of intake air in the housing to remove foreign matter contained in the intake air;
An air cleaner with a precleaner equipped with
The precleaner is
A turning portion for turning intake air introduced into the inlet;
A collecting unit for collecting the foreign matter centrifugally separated from the intake air swirled by the swirling portion;
A communication part provided outside the collection part and communicating the collection part with a position downstream of the collection part in the flow direction of the intake air in the housing;
An air cleaner with a precleaner characterized by comprising:   The air cleaner with a precleaner according to claim 1, wherein the communication portion communicates the collection portion with a position downstream of the filter element in the flow direction of intake air in the housing.   The air cleaner with a precleaner according to claim 2, wherein the communicating portion is provided with a separating portion for separating foreign matter from intake air flowing in the communicating portion.   The air cleaner with a precleaner according to claim 3, wherein the separation portion includes a separation filter element.   The air cleaner with a precleaner according to claim 1, wherein the communication portion communicates the collection portion with a position on the upstream side in the flow direction of intake air in the housing with respect to the filter element.