Work machine

Abstract

The invention can improve the workability of a working machine. A blower (1) is provided with: a motor (10); a fan unit that operates by the driving force of the motor (10); a housing part (2) in which the motor (10) and the fan part are accommodated; and an attachment part attached to the housing part (2). The housing (2) includes a first housing member (2a) and a second housing member (2b) that are combined in the left-right direction, and a filter holder (16b) disposed so as to straddle the first housing member (2a) and the second housing member (2b). The filter holder (16b) has a first engagement section that engages with the attachment section.

Description

Technical Field

[0001] The present invention relates to an operating machine such as a blower. Background Art

[0002] As an example of a working machine, there is known an electric blower (air blower) comprising: a centrifugal fan that is rotated by the driving force of a motor; a casing (housing portion) that accommodates the motor and the centrifugal fan; and a nozzle portion that delivers air through the flow of air generated by the rotation of the centrifugal fan.

[0003] As an electric blower as described above, for example, Patent Document 1 discloses a structure having a housing, which is formed by assembling a set of housings that are split in half and can accommodate a centrifugal fan therein. A suction port is provided on one side of the set of housings that are split in half, and a dust collection hose or the like can be installed as an accessory at the suction port.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2007-332889 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the above-mentioned Patent Document 1, the suction port is provided on one side of a set of housings that are split in half, but if a different type of fan (for example, an axial flow fan that blows air along the rotation axis of the fan) is used and the overall layout of the product is different, the suction port is sometimes arranged to span both sides of the set of housings that are split in half. If accessories such as nozzles are to be detachably mounted on the air inlets that span both sides of the set of housings that are split in half, it is necessary to provide accessory holding portions on each of the split housings.

[0009] In this case, there is a tendency for the tolerance of the position and distance between the plurality of accessory holding portions respectively provided on the divided housing to become larger. Therefore, the accessory is easily dropped from the accessory holding portion during operation, or conversely, it is difficult to remove the accessory from the accessory holding portion, so the operability of the electric blower is deteriorated. Therefore, it is desired to improve the operability of the electric blower.

[0010] An object of the present invention is to provide a working machine with improved workability.

[0011] Solutions to Solve Problems

[0012] The working machine of the present invention comprises: a motor; a working part, which works by the driving force of the motor; a housing part, which accommodates the motor and the working part internally; and an accessory part, which is installed on the housing part, the housing part comprising: a first housing part and a second housing part combined in a first direction; and a third housing part, which is configured to span across the first housing part and the second housing part, the third housing part having a first engaging part that engages with the accessory part.

[0013] Effects of the Invention

[0014] According to the present invention, the operability of the working machine can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view showing the structure of the working machine according to the embodiment of the present invention.

[0016] Figure 2 Yes means Figure 1 A rear view of the structure of the back side of the working machine shown.

[0017] Figure 3 Yes means Figure 1 A side sectional view of the internal structure of the working machine shown.

[0018] Figure 4 It means in Figure 1 A perspective view of a structure in which a nozzle is mounted on the back of the working machine shown.

[0019] Figure 5 Yes means Figure 4 A side view of the structure of the working machine shown.

[0020] Figure 6 Yes means Figure 4 A top view of the structure of the working machine shown.

[0021] Figure 7 Yes means Figure 4 A top sectional view of the internal structure of the working machine shown.

[0022] Figure 8 It means assembled in Figure 4 A side view of the structure of the filter part, the attachment part and the nozzle of the working machine shown.

[0023] Fig. 9 Yes means Figure 4 An exploded perspective view of the structure of the working machine shown.

[0024] Fig.10 It means viewing from the back side Fig. 9 A rear view of the structure of the working machine shown.

[0025] Fig.11 It means along Fig.10 A cross-sectional view of the structure cut along line AA is shown.

[0026] Fig.12 It means to observe from the rear Figure 4 A perspective view of the structure of a filter portion of the working machine shown.

[0027] Fig.13 It means to observe from the front Fig.12 A three-dimensional diagram of the structure of the filter portion.

[0028] Fig.14 Observed from the rear Fig.12 A rear view of the structure of the filter section.

[0029] Fig.15 Yes means Fig.12 : A diagram showing the structure of a filter portion, wherein (a) is a front view viewed from the front, and (b) is a cross-sectional view taken along line AA of (a).

[0030] Fig.16 It means to observe from the rear Figure 4 A perspective view of the structure of an accessory portion of the working machine shown.

[0031] Fig.17 It means to observe from the front Fig.16 A three-dimensional diagram of the structure of the accessory part.

[0032] Fig.18 Observed from the rear Fig.16 A rear view of the structure of the accessory part.

[0033] Fig.19 Yes means Fig.16 The figure shows the structure of the accessory part, (a) is a front view viewed from the front, and (b) is a sectional view cut along the AA line of (a).

[0034] Fig. 20 Observed from the rear Figure 4 The illustrated is a perspective view of a structure in which an attachment part is mounted on a filter part of a working machine.

[0035] Fig.21 Yes means Fig. 20 Side view of the structure.

[0036] Fig. 22 Yes means Fig. 20 Figure 2 shows a structure of the present invention, wherein (a) is a rear view as viewed from the rear, and (b) is a cross-sectional view taken along line AA of (a).

[0037] Fig.23It is a rear view showing the structure of a modified example of the working machine according to the embodiment of the present invention.

[0038] Fig.24 Yes means Fig.23 An exploded perspective view of the structure of the working machine shown.

[0039] Fig.25 It means viewing from the back side Fig.24 A rear view of the structure of the working machine shown. DETAILED DESCRIPTION

[0040] Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[0041] In this embodiment, the blower 1 is taken as an example of a working machine for description. Figure 1 to Figure 3 As shown, the blower 1 is a work machine that blows air to a work site or the like by discharging air sucked from the back side from a nozzle provided on the front side, and is also called an air dust collector or the like. The structure of the blower 1 is described, and includes: a motor 10; a fan unit (working unit) 10a that rotates by the driving force of the motor 10 and generates an air flow F1 in the axial direction C1 along the rotating shaft of the motor 10; a housing 2 that accommodates the motor 10 and the fan unit 10a inside and has an exhaust unit 12 on the front (one side) side of the axial direction C1; and a nozzle 6 that is formed in a cylindrical shape and can be detachably mounted on the exhaust unit 12. The housing 2 includes: a motor housing 3 that accommodates the motor 10 and the fan unit 10a inside and has an exhaust unit 12; a handle 4 that extends from the motor housing 3 in a direction intersecting the axial direction C1 (up and down direction); and a battery mounting unit 5 that is connected to the handle 4 in a manner that is located on the opposite side of the motor housing 3 with the handle 4 sandwiched therebetween. In other words, the motor housing 3 and the battery mounting portion 5 extend along the axial direction C1 in a manner substantially parallel to each other at both ends of the handle portion 4. That is, one end of the handle portion 4 is connected to the motor housing 3, and the other end of the handle portion 4 is connected to the battery mounting portion 5. The housing portion 2 has two housing halves (described later) formed of a synthetic resin such as nylon or polycarbonate. Figure 4 The housing portion 2 is assembled by docking the two housing halves, namely the first housing portion 2a and the second housing portion 2b.

[0042] In the blower 1 of the present embodiment, the direction along the rotation axis of the motor 10 is referred to as the axial direction C1, also referred to as the front-rear direction, and the direction (extension direction E1) intersecting the front-rear direction and extending the handle portion 4 is referred to as the up-down direction. In addition, the direction orthogonal to the front-rear direction and the up-down direction is referred to as the left-right direction.

[0043] like Figure 3As shown, a motor 10 and a fan unit 10a are housed in the motor housing 3. The motor 10 has a stator 10b, which is a coil, and a rotor 10c, which is a magnet, and is, for example, a brushless motor. The fan unit 10a is a centrifugal fan mounted on the rotating shaft of the rotor 10c, and sends the air sucked in from the air intake unit 11 at the rear of the motor housing 3 toward the nozzle 6 mounted on the front side of the motor housing 3. Specifically, in the motor housing 3, the motor 10 including the fan unit 10a is arranged in a cylindrical container. Then, by the rotation of the fan unit 10a, air is sucked in through a metal filter (filter) 16a provided in the air intake unit 11, and the sucked air is sent toward the nozzle 6 along the inner wall 10d of the cylindrical container. At this time, an air flow F1 flowing along the axial direction C1 is generated by the rotation of the fan unit 10a, and the air transported by the air flow F1 is discharged from the front end of the nozzle 6.

[0044] Furthermore, a motor substrate 10 e is attached to the motor 10 . The motor substrate 10 e is equipped with an inverter circuit of the motor 10 and a sensor for detecting the rotation position of the rotor 10 c . The motor substrate 10 e is also accommodated in the motor housing 3 .

[0045] In addition, the handle portion 4 has a switch portion, namely a trigger 9 and a trigger switch 13, which are provided on the motor housing 3 side in a manner protruding toward the front (one side) side of the axial direction C1. In addition, a control substrate 8 equipped with a microcomputer is provided inside the handle portion 4. In addition, a battery pack 7 for supplying power to the motor 10 is detachably installed in the battery mounting portion 5. Therefore, when the trigger 9 is operated, the fan portion 10a operated by the driving force of the motor 10 rotates, and an air flow F1 is generated in the axial direction C1 by the rotation of the fan portion 10a. As a result, the air sucked in from the rear air intake portion 11 is transported forward by the air flow F1 and discharged from the front end of the nozzle 6.

[0046] like Figure 3 As shown, a protrusion 3a protruding forward from the motor housing 3 is provided just below the exhaust portion 12 of the motor housing 3, and an LED 17 for illuminating the portion where air is blown is provided on the protrusion 3a. In this way, by providing the LED 17 on the protrusion 3a protruding forward from the motor housing 3, the working place can be brighter.

[0047] The nozzle 6 is formed in a cylindrical shape, and the diameter of the other end portion is larger than that of the one end portion. Specifically, the base end portion 6b attached to the exhaust portion 12 of the motor housing 3 has an air inlet 6d as the nozzle 6, and the front end portion 6a located on the side opposite to the base end portion 6b has an exhaust port 6e as the nozzle 6. In the nozzle 6, the base end portion 6b is thicker than the front end portion 6a, and has a tapered shape that becomes thinner toward the front end.

[0048] Next, other usages of the blower 1 of this embodiment will be described. Figures 4 to 6 As shown, in the blower 1, a suction nozzle 18 is mounted on the back side (rear side) of the motor housing 3 via the accessory portion 15, so that it can be used for air suction, for example, when air is extracted from a life buoy, a rubber boat, etc. Figure 4 In the blower 1 shown, the housing portion 2 including the motor housing 3 includes a first housing component 2a and a second housing component 2b combined in the left-right direction (first direction), and a third housing component arranged between the first housing component 2a and the second housing component 2b (in other words, arranged across the first housing component 2a and the second housing component 2b). Furthermore, the blower 1 has an accessory portion 15 mounted on the housing portion 2. Specifically, the third housing component is a filter holder 16b that holds a metal filter 16a, and the filter holder 16b is assembled by being sandwiched between the first housing component 2a and the second housing component 2b. The accessory portion 15 can be detachably mounted on the filter holder 16b. Furthermore, as Figure 7 as well as Figure 8 As shown, a nozzle 18 is mounted on the pipe portion 15 d of the fitting portion 15 .

[0049] In detail, Figures 9 to 11 As shown, the motor 10 is arranged in the space surrounded by the first housing member 2a, the second housing member 2b and the filter holder (third housing member) 16b. In addition, the trigger 9, the trigger switch 13, the control substrate 8 and the terminal unit 14 are arranged in the space surrounded by the first housing member 2a and the second housing member 2b.

[0050] Furthermore, when the first housing member 2a and the second housing member 2b are assembled by screws, the assembly is performed in a state where the convex portion 16d of the filter holder 16b is sandwiched by the groove portion 2d provided on the inner peripheral wall on the back side of the first housing member 2a and the groove portion 2e provided on the inner peripheral wall on the back side of the second housing member 2b. Thus, the filter holder 16b is also fixed to the first housing member 2a and the second housing member 2b. In addition, an opening 2c is formed at the end of the back side of the motor housing 3 composed of a part of each of the first housing member 2a and the second housing member 2b, and a mesh-shaped metal filter 16a and a resin filter holder 16b supporting the metal filter 16a are provided in the opening 2c. Therefore, a vent 16g for passing the air flow generated by the fan unit 10a is provided in the filter holder 16b, which becomes a passage for the air sucked through the nozzle 18. In addition, a mesh-shaped metal filter 16a is provided in a manner to close the vent 16g, but a plurality of fine holes are provided in the metal filter 16a, so that air can pass through.

[0051] In addition, if Figure 7 as well as Figure 8 As shown, the fitting part 15 is bowl-shaped and is mounted on the filter holder 16 b from above the filter element (filter part) 16 including the filter holder 16 b.

[0052] Next, the engaging structure between the fitting part 15 and the filter holder 16b will be described. In this embodiment, a buckle is used as the engaging structure between the fitting part 15 and the filter holder 16b.

[0053] First, the structure of the filter element (filter portion) 16 including the filter holder 16b will be described. Figure 12 to Figure 15 As shown, the filter element 16 includes a mesh-shaped metal filter (filter) 16a through which air can pass and a resin filter holder (third shell component) 16b that supports the metal filter 16a. The filter holder 16b is a resin component formed by embedding the metal filter 16a by insert molding. In addition, a first engaging portion that engages with the accessory portion 15 is provided on the filter holder 16b, and the first engaging portion is a component on the filter holder 16b side of the snap. In addition, the constituent element (first engaging portion) of the snap on the filter holder 16b side is a hole portion 16c that is separately provided one each in the left and right directions. On the outer periphery of the filter holder 16b, convex portions 16d that are clamped and fixed by the first shell component 2a and the second shell component 2b are provided at four locations in the upper and lower and left and right directions.

[0054] On the other hand, Figure 16 to Figure 19 As shown, the accessory portion 15 includes a bowl-shaped accessory body 15a, a cylindrical tube portion 15d provided on the accessory body 15a, and claw portions 15b provided on the cut-in portions 15c on both sides of the accessory body 15a. The interior of the tube portion 15d serves as a passage for the air flow generated by the fan portion 10a to flow from the nozzle 18 to the vent 16g. The accessory portion 15 is also provided with a first snap-fit ​​portion that serves as a snap fit with the filter bracket 16b. In the present embodiment, the constituent element (first snap-fit ​​portion) of the snap fit on the side of the accessory portion 15 is a claw portion 15b that is separately provided one each in the left and right directions. These claw portions 15b protrude in the left and right directions, respectively. Therefore, as shown in FIG. Figure 20 to Figure 22 As shown in the figure, the filter holder 16b and the fitting part 15 are engaged by respectively inserting the left and right claws 15b of the fitting part 15 into the left and right holes 16c of the filter holder 16b. Since the claws 15b protrude in the left-right direction, it is not necessary to improve the setting accuracy and size accuracy of the two holes 16c provided in the filter holder 16b in the left-right direction. That is, by adopting the engagement of the claws 15b and the holes 16c, the fitting part 15 is moved in the front-to-back direction intersecting the left-right direction relative to the housing part 2, rather than in the rotation direction, so that it can be attached and detached relative to the filter holder 16b.

[0055] Among them, the components of the buckle, namely the two holes (first engaging portion) 16c, are provided on the filter holder 16b constituted by a single component. In other words, the filter holder 16b is a single component that is not divided in the left-right direction. Therefore, in the air blower 1 of the present embodiment, when the accessory part 15 is installed on the filter holder 16b, the claw part 15b of the buckle is embedded in the hole part 16c of the filter holder 16b constituted by a single component, so that the dimensional accuracy of the position and distance of the two left and right hole parts 16c provided in the filter holder 16b can be easily managed. As a result, the operability of the air blower 1 can be improved. That is, by providing the engaging structure of the accessory part 15 on the filter holder 16b constituted by a single component, the filter holder 16b is a component that is not divided, so the dimensional accuracy of the position and distance of the two hole parts 16c provided separately on the left and right can be easily managed.

[0056] In addition, the blower 1 of this embodiment corresponds to miniaturization. However, in order to ensure the air volume, it is preferable to enlarge the vent 16g. Therefore, in order to reduce the left-right direction and increase the air passage, the shape of the motor housing 3 is a longitudinally long rectangular shape (not circular). As a result, the filter bracket 16b assembled by sandwiching the first housing member 2a and the second housing member 2b also becomes a longitudinally long rectangular shape (not circular). Specifically, as Fig.15 As shown in (a), the shape of the joint portion 16f where the filter holder 16b is joined to the first shell member 2a and the second shell member 2b is a substantially rectangular (non-circular) shape in which the length L1 in the left-right direction is shorter than the length L2 in the up-down direction (third direction) intersecting the left-right direction (L1<L2). In addition, the overall configuration area of ​​the vents 16g divided into a plurality of parts is also a substantially rectangular (non-circular) shape in which the length L3 in the left-right direction is shorter than the length L4 in the up-down direction (third direction) intersecting the left-right direction (L3<L4). Therefore, the left-right dimension of the shell part 2 can be reduced, and the opening area of ​​the vents 16g can be ensured, thereby ensuring the air volume. In addition, since the shape of the filter holder 16b is substantially rectangular, it is difficult to form a snap-fit ​​structure for rotating and mounting the accessory part 15. Therefore, by adopting a buckle in the snap-fit ​​structure of the accessory part 15, the accessory part 15 can be installed by moving in the front-back direction instead of rotating, and the dimensional accuracy of the position and distance between the plurality of first snap-fit ​​parts provided on the filter holder 16b can be easily managed.

[0057] In addition, if Fig.12As shown, the shape of the end face 16e of the filter holder 16b of the filter element 16 in the front-back direction (second direction) intersecting the left-right direction thereof is a non-flat shape. Specifically, by setting the filter holder 16b to be a substantially rectangular (non-circular) shape that is long in the longitudinal direction, the shape of the end face 16e of the filter holder 16b can be set to a cubic curved surface, which can increase the degree of freedom in the design of the blower 1. Furthermore, since the filter can also be bent, the area of ​​the filter can be expanded and the filter function can be improved.

[0058] In addition, if Fig.14 as well as Fig.15 As shown, in the filter holder 16b, the components of the buckle, i.e., the left and right holes (first engaging parts) 16c, are provided in the area where the metal filter 16a is arranged. That is, even if the area of ​​the filter is reduced, by providing the left and right holes 16c on the filter holder 16b formed of a single component and forming the filter holder 16b into a substantially rectangular (non-circular) shape, the tolerance of the relative position of the left and right holes 16c can be reduced, and the installation accuracy of the accessory part 15 relative to the filter holder 16b can be ensured.

[0059] In addition, the filter is a metal filter 16a, and the metal filter 16a is insert-molded in the filter bracket 16b, thereby reducing the number of parts in the assembly of the blower 1. Moreover, since the filter bracket 16b is fixed to the housing portion 2 without a gap, the airtightness of the filter can be improved and the filter function can be improved. In addition, by insert-molding the metal filter 16a in the filter bracket 16b, the surface of the filter can be easily cleaned. Moreover, since the accessory portion 15 is engaged with the filter bracket 16b when the metal filter 16a is supported by the filter bracket 16b, when a structure in which the metal filter 16a needs to be removed when installing the accessory portion 15 is adopted as a comparative example, the man-hours for disassembling and assembling the accessory portion 15 can be reduced, and the strength of the filter bracket 16b can be improved. The fitting 15 is engaged with the filter holder 16 b so as to cover the vent 16 g , so that the air flowing through the fitting 15 passes through the metal filter 16 a and the vent 16 g . Therefore, the metal filter 16 a can capture dust included in the air passing through the fitting 15 .

[0060] Next, Figure 23 to Figure 25 The fan 1 of the modified example shown in FIG. Fig.24As shown, the air blower 1 of the modified example has a structure having a resin battery retaining portion 19 as a third shell component. In the battery retaining portion 19, guide rails (first engaging portions) 19a that serve as guides when removing and assembling the battery pack 7 are provided on the left and right, and are clamped and fixed by the first shell component 2a and the second shell component 2b. By also regarding the battery pack 7 as an example of an accessory, in this structure, a plurality of first engaging portions can be provided in the battery retaining portion 19 composed of a single component, and the dimensional accuracy of the positions and distances of the plurality of first engaging portions provided in the battery retaining portion 19 can be easily managed. As a result, the air blower 1 of the modified example can also improve its operability.

[0061] The present invention is not limited to the above-mentioned embodiment, and various changes can be made without departing from the scope of the present invention. For example, in the above-mentioned embodiment, the accessory part 15 and the nozzle 18 can also be an integral part. In addition, the third shell member can be arranged to at least partially cover the outer surfaces of both the first shell member and the second shell member in a manner spanning the first shell member and the second shell member.

[0062] Explanation of symbols

[0063] 1—blower (operating machine); 2—housing; 2a—first housing member; 2b—second housing member; 2c—opening; 2d, 2e—grooves; 3—motor housing; 3a—protrusion; 4—handle; 5—battery mounting portion; 6—nozzle; 6a—front end portion; 6b—base end portion; 6d—intake port; 6e—exhaust port; 7—battery pack; 8—control board; 9—trigger; 10—motor; 10a—fan portion (working portion); 10b—stator; 10c—rotor; 10d—inner wall; 10e—motor substrate; 11—intake portion; 12—exhaust portion; 13—trigger Machine switch; 14—terminal unit; 15—accessory part; 15a—accessory body; 15b—claw part (first engaging part); 15c—cut-in part; 15d—tube part; 16—filter element (filter part); 16a—metal filter (filter); 16b—filter holder (third shell part); 16c—hole part (first engaging part); 16d—convex part; 16e—end face; 16f—joining part; 16g—vent; 17—LED; 18—nozzle; 19—battery holding part (third shell part); 19a—guide rail (first engaging part); L1, L2—length.

Claims

1. A working machine, characterized in that: have: motor; a working part that works by the driving force of the motor; a housing portion, which accommodates the motor and the working portion therein; as well as an accessory part, which is mounted on the housing part, The housing portion comprises: A first housing component and a second housing component combined in a first direction; as well as a third housing component configured to span across the first housing component and the second housing component, The third housing member includes a first engaging portion engaged with the fitting portion.

2. The working machine according to claim 1, characterized in that: The working part is a fan part that is rotated by the driving force of the motor. The third housing member has an air vent through which the air flow generated by the fan unit passes.

3. The working machine according to claim 1, characterized in that: The first engaging portion includes a claw portion protruding in the first direction, The third housing member is engaged with the fitting portion by the claw portion.

4. The working machine according to claim 1, characterized in that: A plurality of the first engaging portions are provided separately in the first direction.

5. The working machine according to claim 4, characterized in that: The third housing component is a single body component that is clamped and fixed by the first housing component and the second housing component. The plurality of first engaging portions are provided on the third housing member formed of the single member.

6. The working machine according to claim 2, characterized in that: A filter portion including the third housing member and through which air can pass is provided, The filter portion has an end surface in a second direction intersecting the first direction having a non-flat shape.

7. The working machine according to claim 1, characterized in that: The fitting portion is attached to and detached from the third case member by moving in a second direction intersecting the first direction.

8. The working machine according to claim 6, characterized in that: The filter unit includes a filter through which air can pass, and a filter holder that supports the filter and is provided as the third housing member. The shape of the joint portion of the filter holder that is joined to the first case member and the second case member is a non-circular shape in which the length in the first direction is shorter than the length in a third direction intersecting the first direction.

9. The working machine according to claim 8, characterized in that: The first engaging parts are provided in plurality separately in the first direction. The plurality of first engaging portions are provided in a region where the filter is arranged.

10. The working machine according to claim 8, characterized in that: The filter is a mesh metal filter. The filter holder is a resin component in which the metal filter is embedded by insert molding.

11. The working machine according to claim 1, characterized in that: The nozzle is detachably mounted on the attachment portion.

12. The working machine according to claim 6, characterized in that: The vent has a non-circular shape in which the length in the first direction is shorter than the length in a third direction intersecting the first direction.

13. A working machine, characterized in that: have: motor; a fan unit that is rotated by a driving force of the motor; a housing portion that accommodates the motor and the fan portion therein; and an accessory part, which is mounted on the housing part, The housing portion includes a filter holder having an air vent through which the air flow generated by the fan portion can pass, and supporting a filter that closes the air vent and through which the air flow can pass. The filter holder includes a first engaging portion that engages with the fitting portion in a state of supporting the filter.

14. The working machine according to claim 13, characterized in that: The accessory portion enables the air flow generated by the fan portion to pass through the interior, The filter holder is engaged with the fitting portion in a state of supporting the filter so that air flowing inside the fitting portion passes through the filter and the vent.

Images