JP2008202489A - Air cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an air cleaner whole body with keeping pre-cleaner function. <P>SOLUTION: A filter element 2 is provided with a first cap 22 including a communication port 25 making a space part IS communicate to an outer part on both ends of a cylindrical main filter member 21 forming the space part IS in an inner circumference side, and a second cap 23 blocking the space part IS. A pre-filter member 101 is held in such a manner that the same can be detachably inserted from the communication port 25 to the space part IS. A case 3 is provided with a main body case 4 holding an oil element 2 attachably and detachably from an opening part OP with keeping an air gap ITS open from an outer circumference of the main filter 21, and a cover 5 opening and closing the opening part OP. A flow-in space (channel 37) of gas where the communication port 25 is positioned under a condition where the cover 5 is attached on the main body case 4, and a flow-out space (channel 35) of gas where the air gap is positioned are partitioned by a partition part (upper fitting part 36). A flow-in port 10 establishes communication between a flow-in space and the outer part, and a flow-out port 12 establishes communication between a flow-out space and the outer part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an air cleaner that filters gas.

  2. Description of the Related Art Conventionally, in an air cleaner used for an engine mounted on an automobile or a construction machine, a cylindrical filter medium has been widely used in order to increase the filtration capacity while reducing the size of the apparatus. Moreover, in an air cleaner, it is known that filtration performance will improve by providing a pre cleaner. Therefore, conventionally, an air cleaner in which a pre-cleaner and a cylindrical filter medium are combined has been proposed. For example, Patent Document 1 discloses a general-purpose engine air cleaner in which a precleaner and a cylindrical filter medium are unitized.

JP 2005-201193 A

  An air cleaner combining a pre-cleaner and a cylindrical filter medium is inevitably enlarged due to its structure. Even in a structure in which the precleaner and the cylindrical filter medium are unitized as described in Patent Document 1, the problem of increasing the size of the entire air cleaner cannot be solved.

  In addition, in an air cleaner that uses a cylindrical filter medium, dust, such as additional dust, adheres to the outer peripheral side of the filter medium because of the structure in which the filtration target gas is introduced from the outer peripheral side to the inner peripheral side of the filter medium for filtration. . The dust adhering to the outer peripheral side of the filter medium in this way may be detached from the filter medium and dropped into the area cleaner case when the filter element is removed for replacement or the like. Such falling off of the dust into the area cleaner case creates a risk of entering the engine or the like from the gas outlet. In order to prevent this, it is necessary to take measures such as installing an inner filter element at the gas outlet, for example. However, if such measures are taken, the structure becomes complicated.

  An object of the present invention is to downsize the entire air cleaner while providing a precleaner function.

  An object of the present invention is to prevent dust from entering the outlet of the case with a simple structure when removing the filter element from the case.

  An air cleaner according to the present invention includes a filter element that filters gas and a case that houses the filter element, and the filter element includes a cylindrical main filter medium that forms a space portion on an inner peripheral side, and the main filter medium. A first closing member having a communication port that is provided at one end portion of the main filter medium and communicates the space portion with the outside; a second closing member that is provided at the other end portion of the main filter medium and closes the space portion; A pre-filter medium accommodated in the space, and the case has an opening that allows insertion of the filter element from the second closing member, and a gap between the case and the outer periphery of the main filter medium A body case that detachably accommodates the filter element in a state where the filter element is opened, a lid that is detachably attached to the body case, and opens and closes the opening, A partition that partitions the gas inflow space where the communication port is located and the gas outflow space where the gap is located in a state where the lid is attached; and a gas inlet that communicates the inflow space with the outside; A gas outlet for communicating the outflow space with the outside.

  According to the present invention, since the pre-filter medium can be arranged in the space formed on the inner peripheral side of the main filter medium, the entire air cleaner can be reduced in size while having the pre-cleaner function.

  According to the present invention, since the gas to be filtered flows from the inner peripheral side to the outer peripheral side of the main filter medium, dust such as dust is captured on the inner peripheral side of the main filter medium, and the filter element is positioned on the side opposite to the pulling direction. Since the first closed portion that closes the space formed on the inner peripheral side of the main filter medium, when removing the filter element from the case, dust enters the outlet of the case without providing a special structure. Therefore, the structure can be simplified.

  An embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a longitudinal front view showing an air cleaner. The air cleaner 1 includes a filter element 2 that filters gas and a case 3 that houses the filter element 2.

  The case 3 includes a main body case 4 having an opening OP that opens upward, and a lid 5 that is detachably attached to the main body case 4 so as to open and close the opening OP of the main body case 4. A plurality of hooks 6 (only one is shown in FIGS. 1 and 2) are provided at the lower part of the outer periphery of the lid 5 as a fixing mechanism for fixing the lid 5 to the main body case 4. The lid 5 is fixed to the main body case 4 by engaging these hooks 6 with an engaging portion 7 formed on the upper portion of the main body case 4. A packing 8 is fixed to the opening OP of the main body case 4 so as to be sandwiched between the main body case 4 and the lid 5. Thereby, the airtightness between the main body case 4 and the lid 5 is maintained.

  The upper wall 9 of the lid 5 is provided with an inlet 10 for allowing a gas such as air to be filtered to flow into the case 3. The bottom wall 11 of the main body case 4 is provided with an outlet 12 for allowing gas to flow out from the inside of the case 3. The inflow port 10, the outflow port 12, and the filter element 2 are arranged on the same axis.

  FIG. 2 is a longitudinal front view of the air cleaner showing a state where the lid is opened and the filter element is taken out from the main body case. As shown in FIG. 2, the lid 5 is opened by releasing the locking of the locking portion 7 by the hook 6. The filter element 2 can be inserted into and removed from the main body case 4 by opening the lid 5.

  Note that the fixing mechanism for fixing the lid 5 to the main body case 4 is not limited to locking by the hook 6, and may be screwed by a screw (not shown), for example.

  Here, the filter element 2 will be described. In the filter element 2, a pair of upper and lower first caps 22 and second caps 23, which are a first closing member and a second closing member, are fixed to both ends in the axial direction of a cylindrical main filter medium 21. It is formed in a hollow shape. Therefore, a space portion IS is formed on the inner peripheral side of the main filter medium 21. A plurality of, in the present embodiment, seven pre-filter media 101 are accommodated in the space IS formed on the inner peripheral side of the main filter media 21 (the pre-filter media 101 will be described later).

  A cylindrical metal mesh member 24 that covers the outer peripheral side of the main filter medium 21 is provided between the first cap 22 and the second cap 23. The metal mesh member 24 covers the outer side of the main filter medium 21 to prevent deformation of the main filter medium 21 toward the outer peripheral side. The metal mesh member 24 has a plurality of holes (not shown), and these holes are formed to have a larger diameter than the holes of the main filter medium 21.

  FIG. 3A is a perspective view of the first cap 22 as viewed from below. As shown in FIG. 3A, the first cap 22 is formed in a disc shape. A communication port 25 that communicates the inside and the outside of the filter element 2 is provided at a substantially central portion of the first cap 22.

  FIG. 3B is a perspective view of the second cap 23 as viewed from above. As shown in FIG. 3B, the second cap 23 is formed in a disk shape like the first cap 22. On the other hand, unlike the first cap 22, the second cap 23 is not formed with a hole corresponding to the communication port 25.

  In the first cap 22 and the second cap 23, gas flows into the space IS formed inside the main filter medium 21 from the communication port 25, and the gas flowing into the space IS passes through the main filter medium 21. Thus, the main filter medium 21 has a function of maintaining airtightness at both ends so that it flows outside the filter element 2. In the filter element 2, the inside and the outside of the filter element 2 communicate with each other through the communication port 25 and the main filter medium 21.

  FIG. 4 is a horizontal sectional view showing the filter element 2. The main filter medium 21 is formed in a cylindrical shape as described above, and is formed so that a plurality of ridges 26 are generated in the circumferential direction. In the main filter medium 21, these ridges 26 are located on the outer peripheral side and bent toward the inner peripheral side, and the inner bent portion 28 positioned closer to the inner peripheral side than the outer bent portion 27 and bent toward the outer peripheral side. Are alternately provided in the circumferential direction. Such a main filter medium 21 is formed by bending a sheet-shaped filter medium into a bellows shape so that a mountain fold portion and a valley fold portion are alternately positioned, and joining both ends into a cylindrical shape. . A plurality of pores (not shown) are formed in the main filter medium 21, and the main filter medium 21 filters gas by this structure. Examples of the material of the main filter medium 21 include paper and metal.

  In the filter element 2, the diameter of an imaginary circle passing through the inner bent portion 28 forming the space portion IS is set so as not to be smaller than the diameter of the communication port 25 formed in the first cap 22. The virtual circle passing through the inner bent portion 28 is positioned so as not to protrude inward from the inner periphery of the communication port 25.

  As shown in FIG. 1, the diameter of the filter element 2 is set to such a dimension that a gap ITS is formed between the filter element 2 and the inner peripheral surface of the main body case 4 in a state where the filter element 2 is accommodated in the main body case 4. .

  The inner surface 29 of the main filter medium 21 is provided with a protrusion 30 that is a restricting portion that restricts the interval between the inner bent portions 28 from being reduced. The protrusion 30 is formed in a shape protruding from the inner surface 29 to the inside of the flange 26, and more specifically, one of the opposing surfaces 29a and 29b facing each other on the inner side of the flange 26 for each flange 26. Are provided in a straight line in the vertical direction. Such a protrusion 30 can be provided, for example, by adhering a resin hot melt to the main filter medium 21.

  FIG. 5 is a perspective view of a part of the main filter medium 21 showing another example of the restricting portion as seen from the inner peripheral side. As the restricting portion, each inner bent portion 28 may be provided with a protruding portion 31 formed by projecting a part of the inner bent portion 28 of the main filter medium 21 on both sides, that is, inside the flange 26. When such a protrusion 31 is used to form a fold line in the sheet-like filter medium in order to form the inner bent part 28 of the main filter medium 21, the fold line is not attached to the part where the protrusion 31 is formed. The main filter medium 21 is bent along the fold line to form the inner bent portion 28.

  The restricting portion is not limited to the one described so far, and any restricting portion may be used as long as the interval between the inner bent portions 28 is restricted. For example, the regulating portion may be realized by increasing the rigidity of the filter medium by attaching a long reinforcing material to the inner bent portion 28 in the vertical direction.

  FIG. 6 is a perspective view showing the pre-filter medium 101. As shown in FIG. 6, the pre-filter medium 101 is formed of a cylindrical member. Such a tubular pre-filter medium 101 is formed, for example, by holding a sheet-shaped filter medium in a cylindrical shape. The filter medium in this case has a structure in which the grain is coarser than that of the main filter medium 21, and is formed of, for example, a metal net or a collection of fibers such as metal and paper. Moreover, the pre filter medium 101 should just be formed with the filter medium which has the grain of the grade which can exhibit not only the relative relationship with the main filter medium 21, but the performance as a pre cleaner. The roughness of the grain of the pre-filter medium 101 is set so that the ventilation resistance is not significantly increased by providing the pre-filter medium 101, and preferably, the ventilation resistance is hardly changed regardless of the presence or absence of the pre-filter medium 101. It is desirable that

Here, the filtration performance range of the main filter medium 21 and the pre-filter medium 101 is illustrated. The main filter medium 21 preferably has a pore size (MEAN) of about 35 to 45 μm. As the prefilter medium 101, it is preferable that the opening area is 3.0mm ² ~10.0mm ² about.

  Moreover, although not shown in figure, the cylindrical pre filter medium 101 has the upper part opened, and the bottom part has obstruct | occluded. Therefore, in a state where the pre-filter medium 101 is accommodated in the space portion IS formed on the inner peripheral side of the main filter medium 21 shown in FIGS. 1 and 2, the upper part where the pre-filter medium 101 is opened covers the first cap 22 side. The closed bottom portion of the pre-filter medium 101 is positioned on the second cap 23 side.

  As shown in FIGS. 1 and 2, the length of the pre-filter medium 101 is shorter than the length of the main filter medium 21 in the axial direction. Therefore, the bottom of the pre-filter medium 101 is supported by the second cap 23, and in this state, the upper portion is held in a state where it does not reach the first cap 22.

  Next, the attachment structure of the filter element 2 to the case 3 will be described.

  First, the lower mounting structure will be described. As shown in FIGS. 1 to 3, a plurality of step-shaped fitting pieces 32 (three in this embodiment) are radially formed on the outer peripheral portion of the second cap 23 on the lower side of the filter element 2. It is positioned and fixed. These fitting pieces 32 constitute a fitting portion 33 on the filter element 2 side. On the other hand, an annular lower fitting portion 34 having a step shape in which the fitting portion 33 of the filter element 2 is detachably fitted inside is provided in the lower portion inside the main body case 4. As described above, in a state where the filter element 2 is accommodated in the main body case 4, the gap ITS is formed between the outer peripheral side of the filter element 2 and the inner peripheral surface of the main body case 4 (see FIG. 1). Therefore, in a state where the fitting portion 33 of the filter element 2 is fitted to the lower fitting portion 34, the flow path 35 that communicates the outer peripheral side of the main filter medium 21 and the outlet 12 of the main body case 4 is formed inside the case 3. It is formed.

  As an upper mounting structure, an annular upper fitting portion 36 having a stepped shape with which the first cap 22 on the upper side of the filter element 2 is fitted is provided inside the lid 5. The upper cap 36 is fitted with the first cap 22 on the upper side of the filter element 2 with the lid 5 attached to the main body case 4. When the first cap 22 on the upper side of the filter element 2 is fitted to the upper fitting portion 36, a flow path 37 that communicates the inlet 10 of the lid 5 and the communication port 25 of the filter element 2 is formed inside the case 3. Formed. At this time, the inflow port 10 communicates only with the communication port 25 of the filter element 2 through the flow path 37 inside the case 3.

  In this structure, the lid 5 is closed with the fitting portion 33 of the filter element 2 fitted to the lower fitting portion 34 of the body case 4, and the lid 5 is fixed to the body case 4 by the hook 6. Thus, the first cap 22 on the upper side of the filter element 2 is fitted into the upper fitting portion 36 of the lid 5, and the filter element 2 is sandwiched between the main body case 4 and the lid 5 and fixed to the case 3. This fixing is released by opening the lid 5, whereby the filter element 2 can be taken out from the case 3.

  The function of the upper fitting portion 36 will be further described. A flow path 37 that connects the inlet 10 of the lid 5 and the communication port 25 of the filter element 2 constitutes a gas inflow space where the communication port 25 is located. The flow path 35 that connects the outer peripheral side of the main filter medium 21 and the outlet 12 of the main body case 4 constitutes a gas outflow space in which the gap ITS is located. As clearly shown in FIG. 1, the upper fitting portion 36 functions to partition a flow path 37 that constitutes a gas inflow space and a flow path 35 that constitutes a gas outflow space. Therefore, the upper fitting part 36 functions as a partition part that partitions the gas inflow space (flow path 37) and the gas outflow space (flow path 35) in a state where the lid 5 is attached to the main body case 4.

  In such a configuration, the flow of the gas to be filtered flowing into the case 3 from the inlet 10 is indicated by arrows in FIG. The gas that flows into the case 3 from the inlet 10 flows along the flow path 37 and flows into the filter element 2 from the communication port 25. The gas that has flowed into the filter element 2 passes through the pre-filter medium 101 through the main filter medium 21 and the remaining part directly through the main filter medium 21 from the flow path 37 serving as the gas inflow space. It passes through the metal mesh member 24 and flows out of the filter element 2. Then, it flows along the flow path 35 which becomes an outflow space, reaches the outflow port 12 of the case 3, and flows out of the air cleaner 1.

  In such a gas flow to be filtered, dust such as dust or dust contained in the gas moves together with the gas, and is captured by the pre-filter medium 101 and the main filter medium 21 in the process. Removed. That is, of the dust contained in the gas to be filtered, relatively large dust is captured in advance by the pre-filter medium 101 and does not reach the main filter medium 21. For this reason, it is possible to improve the filtration performance, extend the life of the main filter medium 21, and the like.

  Moreover, the pre-filter medium 101 is accommodated in a space part IS formed by the main filter medium 21. Even if such a structure is adopted, a flow structure in which the gas to be filtered flowing from the communication port 25 of the filter element 2 moves from the inside to the outside of the main filter medium 21 is adopted. And main filtration by the main filter medium 21 can be realized. Since the pre-filter medium 101 is accommodated in the space IS formed by the main filter medium 21, the entire air cleaner 1 can be reduced in size while providing the pre-cleaner function.

  Further, the gas to be filtered flows in from the communication port 25 of the filter element 2 and moves from the inside to the outside of the main filter medium 21 and passes through the pre-filter medium 101 and the main filter medium 21 in the process. The inside of 101 and the inside of the tub 26 of the main filter medium 21 function as a dust reservoir, and the dust trapped by the pre-filter medium 101 and the main filter medium 21 is accumulated inside the pre-filter medium 101 and the main filter medium 21. Thereby, the dust trapped by the pre-filter medium 101 and the main filter medium 21 exists inside the filter element 2 and does not exist on the outer peripheral side of the filter element 2. Therefore, when the filter element 2 is removed from the case 3 for replacement or cleaning, the filter element 2 even if dust captured by the pre-filter medium 101 and the main filter medium 21 due to vibration or the like is separated from the pre-filter medium 101 and the main filter medium 21. Is prevented from falling outside the filter element 2. Therefore, the dust trapped by the pre-filter medium 101 and the main filter medium 21 is prevented from falling into the case 3, and the dust is prevented from entering the outlet 12.

  In the conventional air cleaner, in order to increase the filtration capacity of the filter medium, the outside of the basket functions as a dust reservoir as a structure that allows gas to pass through the filter medium from the outside to the inside. In contrast, in the air cleaner 1 according to the present embodiment, the structure for preventing dust from entering the outlet 12 of the case 3 when the filter element 2 is removed from the case 3 is reduced and simplified. Therefore, as described above, the communication port 25 of the filter element 2 is communicated with the inlet 10 of the case 3, and the outer peripheral side of the main filter medium 21 is communicated with the outlet 12, so that the filter element 2 can be removed. It prevents dust from entering the outlet 12. Therefore, in the air cleaner 1 of the present embodiment, it is possible to prevent dust from entering the outlet 12 when removing the filter element 2 without providing a special structure. Therefore, it is possible to simplify the structure and reduce the manufacturing cost.

  Further, conventionally, since gas flows from the outside to the inside of the filter medium, it is provided inside the metal core member filter medium for preventing the filter medium from being deformed inward by the gas flow. In the embodiment, since the gas is allowed to flow from the inside to the outside of the main filter medium 21, such a core member is not necessary.

  Further, in the filtration process as described above, a force that moves the adjacent inner bent portions 28 of the main filter medium 21 in close contact with each other due to the gas flow from the inside to the outside of the main filter medium 21. 21 may be added. In this case, the main filter medium 21 having a low rigidity such as paper is easily affected by the force. In the present embodiment, for example, a protrusion is used as a restricting portion that restricts the interval between the inner bent portions 28 from being reduced. Since 30 is provided in the main filter medium 21, it is regulated that the interval between the main filter elements 21 is reduced, so that the adjacent inner bent portions 28 in the main filter medium 21 are completely in close contact with each other, and the trough 26 is closed. It is prevented. Therefore, it is possible to prevent the filtration capacity of the main filter medium 21 from being reduced due to the closure of the trough 26.

  Moreover, in this Embodiment, a control part can be made into a simple structure because the control part is the protrusion 30 or 31 which was provided in the main filter medium 21 and protruded inside the collar 26. FIG.

  In the present embodiment, the main filter medium 21 has an outer bent portion 27 located on the outer peripheral side and bent toward the inner peripheral side, and an inner bent portion positioned closer to the inner peripheral side than the outer bent portion 27 and bent toward the outer peripheral side. Since the flanges 26 are formed by alternately providing the portions 28 in the circumferential direction, the flanges 26 are realized with a simple structure.

  Moreover, in this Embodiment, the bottom part of the pre filter medium 101 is obstruct | occluded. That is, the pre-filter medium 101 is closed on the second cap 23 side while being accommodated in the space IS formed by the main filter medium 21. Thereby, the dust dropped from the inner surface of the pre-filter medium 101 stays inside the pre-filter medium 101 and does not drop into the space IS between the main filter medium 21 and the pre-filter medium 101. Therefore, in the filter element 2 having a structure in which the main filter medium 21 is cleaned and reused, dust that has fallen from the inside of the pre-filter medium 101 does not enter the space IS, and the main filter medium 21 can be easily cleaned.

  In the present embodiment, since a plurality of pre-filter media 101 are provided, the filtration volume of the pre-filter media 101 can be increased, and the pre-filtration efficiency can be improved.

  In addition, in the present embodiment, since the pre-filter medium 101 is formed shorter than the axial length of the main filter medium 21, the space IS between the upper part of the pre-filter medium 101 and the first cap 22 is a gap. Maintained in a state. Thereby, the ventilation resistance of the gas flowing into the filter element 2 from the communication port 25 can be reduced.

  FIG. 7 is a horizontal sectional view showing another example of the main filter medium 21. The air cleaner 1 has a structure that reduces the cost and simplifies the structure for preventing dust from entering the outlet 12 when the filter element 2 is removed. Since it functions as a reservoir, the filtration capacity becomes smaller than that of a conventional air cleaner. Therefore, an example of a method for increasing the filtration capacity of the air cleaner 1 will be described below.

  The main filter medium 21 shown in FIG. 7 is formed in an M-fold shape. In other words, there are two types of inner bent portions 28: an inner bent portion 28a located near the central axis 21a of the main filter medium 21, and an inner bent portion 28b positioned far from the central axis 21a of the main filter medium 21. The bent portions 28a and the inner bent portions 28b are alternately provided in the circumferential direction with the outer bent portion 27 interposed therebetween. Thereby, when viewed from above, the main filter medium 21 has a shape in which a plurality of “M” characters are arranged in the circumferential direction.

  With such a configuration, the inner filter part 21 is an inner bent part that is an inner bent part located on the innermost peripheral side under the condition that the same filter area as that of the main filter medium 21 of the above-described form that is not M-folded is obtained. The interval of 28 b can be made wider than the interval of the inner bent portions 28 in the main filter medium 21. Thereby, the capacity | capacitance inside the eaves 26, ie, a dust storage capacity, becomes large, and it can enlarge a filtration capacity.

  FIG. 8 is a horizontal sectional view of a filter element showing another example of the pre-filter medium 101. In the present embodiment, a pre-filter medium 101 formed by a cylindrical member is introduced. On the other hand, as another example, the pre-filter medium 101 may be formed by a mass of a plurality of fibrous members 102. The fibrous member 102 is formed of, for example, metal fiber or paper fiber.

  FIG. 9 is a horizontal sectional view of a filter element showing still another example of the pre-filter medium 101. As yet another example of the pre-filter medium 101, the pre-filter medium 101 may be formed of a sponge-like member.

  The inventors of the present invention actually manufactured the air cleaner 1 as described in the embodiment, and confirmed the effect of the pre-filter medium 101 by experiments. That is, the relationship between the air resistance and the flow rate of the air cleaner 1 and the relationship between the dust holding capacity of the air cleaner 1 and the air flow resistance were verified by experiments.

  The actual machine used in the experiment is an actual machine using the pipe-shaped material illustrated in FIG. The pre-filter medium 101 used in the experiment has a structure in which a strip-shaped member having a plurality of openings of about 1.0 mm × 5.0 mm is spirally wound to form a pipe shape.

The filtration performance of the main filter medium 21 and the pre-filter medium 101 used in the experiment is
Main filter medium 21 [pore size (MEAN)] = 43 μm
Pre-filter medium 101 [opening area, opening ratio] = 5.0 mm ² , about 20%
It is.

  FIG. 10 is a graph showing the relationship between the air flow resistance of the air cleaner 1 and the flow rate. In FIG. 10, a line connecting black circle plots is an experimental result in an actual machine corresponding to the present embodiment, and a line connecting x plots is an experimental result in an actual machine without the pre-filter medium 101. As shown in the graph of FIG. 10, it was verified that there was no significant change in the ventilation resistance in any case.

  FIG. 11 is a graph showing the relationship between the dust holding capacity of the air cleaner 1 and the ventilation resistance. In FIG. 10, the solid line is the experimental result of the actual machine corresponding to the present embodiment, and the dotted line is the experimental result of the actual machine not provided with the pre-filter medium 101. As shown in FIG. 11, it was verified that the dust holding capacity when the pre-filter medium 101 is accommodated in the space portion IS formed by the main filter medium 21 is significantly improved when the ventilation resistance value is the same. .

It is a vertical front view which shows an air cleaner as one Embodiment of this invention. It is a vertical front view of an air cleaner showing a state where a lid is opened and a filter element is taken out from a main body case. (A) is the perspective view which looked at the 1st cap (1st closure member) from the lower part, (b) is the perspective view which looked at the 2nd cap (2nd closure member) from the upper part. It is a horizontal sectional view showing a filter element. It is the perspective view which looked at a part of main filter medium which shows another example of a control part from the inner peripheral side. It is a perspective view which shows a pre filter medium. It is a horizontal sectional view showing another example of the main filter medium. It is a horizontal sectional view of the filter element which shows another example of a pre filter medium. It is a horizontal sectional view of the filter element which shows another example of a pre filter medium. It is a graph which shows the relationship between the ventilation resistance and flow volume of an air cleaner. It is a graph which shows the relationship between the dust holding capacity | capacitance of an air cleaner, and ventilation resistance.

Explanation of symbols

2 Filter element 3 Case 4 Body case 5 Lid 10 Inlet 12 Outlet 21 Main filter medium 22 First cap (first closing member)
23 Second cap (second closing member)
25 Communication port 35 Channel (outflow space)
36 Upper fitting part (partition part)
37 Flow path (inflow space)
101 Pre-filter media IS space ITS gap OP opening

Claims (9)

A filter element for filtering gas;
A case for accommodating the filter element;
With
The filter element is
A cylindrical main filter medium forming a space on the inner peripheral side;
A first closing member provided at one end of the main filter medium and having a communication port for communicating the space with the outside;
A second closing member that is provided at the other end of the main filter medium and closes the space;
A pre-filter medium housed in the space,
With
The case is
A main body case that has an opening that allows insertion of the filter element from the second closing member, and that detachably accommodates the filter element in a state where a gap is opened between the outer periphery of the main filter medium;
A lid that opens and closes the opening by being detachably attached to the body case;
A partition for partitioning a gas inflow space where the communication port is located and a gas outflow space where the gap is located in a state where the lid is attached to the main body case;
A gas inlet for communicating the inflow space with the outside;
A gas outlet for communicating the outflow space with the outside;
Comprising
Air cleaner.   2. The air cleaner according to claim 1, wherein the filter element is capable of accommodating the pre-filter medium in the space portion so as to be detachable from the communication port.   The air cleaner according to claim 1 or 2, wherein the pre-filter medium is formed by a cylindrical member that opens in the same direction as the communication port in a state of being accommodated in the space portion.   The air cleaner according to claim 3, wherein the pre-filter medium is closed on a side of the second closing member while being accommodated in the space.   The air cleaner according to claim 2, wherein a plurality of the pre-filter media are provided.   The air cleaner according to claim 1, wherein the pre-filter medium is formed by a plurality of fibrous members.   The air cleaner according to claim 1, wherein the pre-filter medium is formed of a sponge-like member.   The air cleaner according to any one of claims 1 to 7, wherein the pre-filter medium is formed shorter than an axial length of the main filter medium.   The air cleaner according to any one of claims 1 to 8, wherein the inflow port is provided in the lid with a central axis thereof positioned at a position coinciding with a central axis of the filter element accommodated in the case.

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