JP2022170041A - Working machine and filter - Google Patents

Abstract

To achieve a working machine including a filter improved in dust collection performance and maintainability.SOLUTION: A dust collector includes: a head which has an electric motor and a fan; a tank on which the head is mounted; and a prefilter 31 which can collect dust contained in air flowing from the tank into the head. The prefilter 31 is formed into a bag-shape by a bottom face section 51 for closing one end side in an axial direction, an opening 52 provided on the other end side in the axial direction, and a side face section 53 extending from the bottom face section 51 toward the opening 52. A plurality of pleats 60 extending in the axial direction are provided along a circumferential direction in the side face section 53 of the prefilter 31. Each pleat 60 is folded back in the circumferential direction and is formed of a plurality of folded sections overlapping each other in a radial direction. Folds 71a, 72a of the folded sections are inclined in the circumferential direction with respect to the axial direction.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present invention relates to a filter that collects dust contained in the air and a working machine equipped with the same.

Patent Document 1 describes a dust collector that is an example of the above working machine. A dust collector described in Patent Document 1 includes a rotationally driven fan, a tank into which air is sucked by the suction force of the fan, and a filter arranged in the tank. In this dust collector, a filter collects dust contained in the air sucked into the tank. The dust collected by the filter adheres to the surface (external surface) of the filter, then falls off (exfoliates) from the external surface of the filter and is stored in the tank.

JP 2015-186780 A

In such work machines, it is desired to improve the dust collection performance and maintainability of the filter. More specifically, it is desirable to increase the surface area (filtering area) while maintaining the outer dimensions (volume) of the filter. In addition, it is desired to suppress deposition and accumulation of dust on the filter.

SUMMARY OF THE INVENTION An object of the present invention is to realize a work machine equipped with a filter with improved dust collection performance and maintainability.

A work machine according to one embodiment includes a drive source, a fan rotationally driven by the drive source, a head containing the drive source and the fan and having an air intake, and an air intake, and the head is mounted. and a filter connected to the head so as to cover the air inlet and capable of collecting dust contained in air sucked from the air inlet and flowing into the air inlet. The filter includes a bottom portion closing one end in the axial direction, an opening provided at the other end in the axial direction and connected to the intake port, and extending from the bottom portion toward the opening. It is formed in the shape of a bag by the side part which carries out. A plurality of pleats extending between the bottom surface portion and the opening are provided along the circumferential direction on the side surface portion of the filter. Each of the pleats is formed by a plurality of folded portions that are folded back in the circumferential direction and that overlap in the radial direction. At least one fold of the plurality of folded portions forming each of the pleats is inclined in the circumferential direction with respect to the axial direction.

A filter of one embodiment is connected to a work machine so as to cover an air intake of the work machine, and is capable of collecting dust contained in air flowing into the air intake. The filter includes a bottom portion closing one end in the axial direction, an opening provided at the other end in the axial direction and connected to the intake port, and extending from the bottom portion toward the opening. It is formed in the shape of a bag by the side part which carries out. The side portion is provided with a plurality of pleats extending between the bottom portion and the opening along the circumferential direction. Each of the pleats is formed by a plurality of folded portions that are folded back in the circumferential direction and that overlap in the radial direction. At least one fold of the plurality of folded portions forming each of the pleats is inclined in the circumferential direction with respect to the axial direction.

ADVANTAGE OF THE INVENTION According to this invention, the working machine provided with the filter improved in dust collection performance and maintainability is implement|achieved.

It is a perspective view which shows the external appearance of a dust collector. It is sectional drawing which shows the structure of a dust collector. It is an expanded view which shows the structure of a dust collector. FIG. 4 is a plan view of a pre-filter; It is a bottom view of a pre-filter. FIG. 4 is a side view of a pre-filter; FIG. 7 is an overall cross-sectional view of the pre-filter taken along line aa in FIG. 6; FIG. 7 is an overall cross-sectional view of the pre-filter along line bb in FIG. 6; FIG. 7 is a partially enlarged cross-sectional view of the pre-filter taken along line aa in FIG. 6; FIG. 7 is a partially enlarged cross-sectional view of the pre-filter taken along line bb in FIG. 6; FIG. 7 is a partially enlarged cross-sectional view of the pre-filter taken along line mm in FIG. 6; FIG. 10 is a side view of a replaceable pre-filter; 12 is a partially enlarged cross-sectional view of the pre-filter taken along line cc in FIG. 11; FIG. FIG. 12 is a partially enlarged cross-sectional view of the pre-filter taken along line dd in FIG. 11; FIG. 12 is a partially enlarged cross-sectional view of the pre-filter taken along line nn in FIG. 11; FIG. 11 is a side view of another replaceable pre-filter; 15 is a partially enlarged cross-sectional view of the pre-filter taken along line ee in FIG. 14; FIG. 15 is a partially enlarged cross-sectional view of the pre-filter taken along line ff in FIG. 14; FIG.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. In addition, in all the drawings for describing the embodiments, the same reference numerals are used for the same or substantially the same configurations and elements, and as a general rule, repeated descriptions will not be performed.

<Overall composition>
FIG. 1 is a perspective view showing the appearance of a working machine (dust collector) 1 according to this embodiment. FIG. 2 is a cross-sectional view showing the structure of the dust collector 1 shown in FIG. FIG. 3 is an exploded view showing the structure of the dust collector 1 shown in FIG.

The dust collector 1 shown in FIGS. 1 to 3 includes a tank 10, a head 20 arranged over the tank 10, a plurality of filters 30 arranged between the tank 10 and the head 20, and a restoring member 40 disposed inside the filter 30 .

<Filter and restoration member>
The filter 30 includes a primary filter 31 arranged inside the tank 10, a secondary filter 32 arranged inside the primary filter 31, and a tertiary filter 33 arranged inside the secondary filter 32. be

From another point of view, the primary filter 31 is provided outside the secondary filter 32 and the tertiary filter 33 is provided inside the secondary filter 32 . That is, the filter 30 has a three-layer structure. In other words, primary filter 31 is an outer filter, tertiary filter 33 is an inner filter, and secondary filter 32 is an intermediate filter.

The primary filter 31 is formed in a bag-like shape with cloth made of synthetic fibers, chemical fibers, or the like. The secondary filter 32 is cylindrically formed of a non-woven fabric made of synthetic fibers, chemical fibers, or the like. The tertiary filter 33 is formed in a cylindrical shape by pleated filter paper or the like. The pore diameter of the secondary filter 32 is smaller than that of the primary filter 31 , and the pore diameter of the tertiary filter 33 is smaller than that of the secondary filter 32 .

The secondary filter 32 surrounds the tertiary filter 33 and is integrated with the tertiary filter 33 . However, the secondary filter 32 and the tertiary filter 33 can also be separated if desired.

The restoring member 40 is a cylindrical elastic body made of a foaming resin material such as polyurethane foam. The molded body density of the restoring member 40 is set according to the hardness required for the restoring member 40 . The molded body density of the restoring member 40 is set to 30 Kg/m ³ , for example.

In the following description, the primary filter 31 may be called "pre-filter 31", the secondary filter 32 may be called "cross filter 32", and the tertiary filter 33 may be called "dust filter 33". Also, the restoring member 40 may be called a "filter damper 40".

<Tank>
The tank 10 is a bottomed container provided with a suction port 11 on the side and a substantially square opening 12 on the top. From another point of view, the tank 10 is a bottomed container having a substantially square planar shape. A hose (not shown) is connected to the suction port 11 of the tank 10 . For example, a connection plug provided at one end of the hose is inserted into the suction port 11 and locked. A cleaner head, a nozzle, and the like are connected to the other end of the hose.

Four casters 13 are provided at the bottom of the tank 10 . The four casters 13 are arranged one by one at the four corners of the tank 10 and are rotatably supported. It should be noted that in some embodiments one or more casters 13 are provided with stops.

Two opposing sides of the tank 10 are provided with clamps 14 respectively. One end (base end) of each clamp 14 is rotatably connected to the tank 10, and the other end (tip end) of each clamp 14 is formed with a claw-shaped locking portion.

<Head>
The head 20 has a head cover 21 , an electric motor 22 housed inside the head cover 21 and fixed, and a fan 23 rotationally driven by the electric motor 22 . That is, the electric motor 22 is the driving source of the fan 23 .

The head cover 21 is provided with an intake port 21 a and an exhaust port 21 b that communicate with the inside and outside of the head 20 . The intake port 21a communicates with the tank 10 through the filter 30, and the exhaust port 21b communicates with the outside.

The head 20 is mounted in the opening 12 of the tank 10 so as to close the opening 12 . After mounting the head 20 on the opening 12 of the tank 10 , the head 20 is fixed to the tank 10 by locking the locking portion of the clamp 14 provided on the tank 10 to the head cover 21 . That is, the head 20 can be attached to and detached from the tank 10 .

When the head 20 is fixed to the tank 10 as described above, the pre-filter 31 and the dust filter 33 are sandwiched between the head 20 and the tank 10 . As a result, the pre-filter 31, the cross filter 32 and the dust filter 33 are interposed between the tank 10 and the head 20 in this order. From another point of view, the tank 10 and the head 20 are partitioned by a plurality of filters 30 (pre-filter 31, cross filter 32, dust filter 33) capable of collecting dust.

<Basic operation>
When the fan 23 is driven to rotate by the electric motor 22 incorporated in the head 20 , air is sucked into the tank 10 through the hose connected to the suction port 11 of the tank 10 . When a power button provided on the upper surface of the head cover 21 is operated, the electric motor 22 is operated to rotate the fan 23 . Further, the number of revolutions of the electric motor 22 can be changed stepwise by an operation panel provided on the upper surface of the head cover 21 .

The air sucked into the tank 10 by the suction force of the fan 23 passes through the pre-filter 31, the cross filter 32 and the dust filter 33 in this order, and then flows into the head 20 through the intake port 21a. Dust in the air is collected by these filters 31 , 32 and 33 while the air passes through the pre-filter 31 , cross filter 32 and dust filter 33 . Specifically, the dust contained in the air is first collected by the pre-filter 31 . Next, the dust that has passed through the prefilter 31 is collected by the cross filter 32 . Finally, the fine dust that has passed through the cloth filter 32 is collected by the dust filter 33 . The air that has flowed into the head 20 through all the filters 31, 32, 33 is exhausted to the outside of the head 20 through the exhaust port 21b.

<Pre-filter>
Details of the pre-filter 31 shown in FIGS. 2 and 3 will now be described. 4 is a plan view of the pre-filter 31, FIG. 5 is a bottom view of the pre-filter 31, and FIG. 6 is a side view of the pre-filter 31. As shown in FIG. A straight line X indicated by a one-dot chain line in FIG. 6 indicates the axis of the pre-filter 31 . That is, the extending direction of the straight line X matches the axial direction of the pre-filter 31 .

FIG. 7 is an overall cross-sectional view of the prefilter 31 taken along line aa in FIG. FIG. 8 is an overall cross-sectional view of the prefilter 31 taken along line bb in FIG. However, the cross section of the pre-filter 31 shown in FIGS. 7 and 8 is simplified for drawing convenience reasons.

9A is a partially enlarged cross-sectional view of the pre-filter 31 taken along line aa in FIG. 6. FIG. More specifically, FIG. 9A is an enlarged cross-sectional view showing part A in FIG. 9B is a partially enlarged cross-sectional view of the pre-filter 31 taken along line bb in FIG. More specifically, FIG. 9B is an enlarged cross-sectional view showing part B in FIG. 10 is a partially enlarged cross-sectional view of the pre-filter 31 taken along line mm in FIG.

As can be seen from these drawings, the pre-filter 31 is in the shape of a bottomed bag that is closed at one axial end (lower side) and opened at the other axial end (upper side). More specifically, one axial end side of the pre-filter 31 is closed by the bottom surface portion 51 . On the other hand, an opening 52 is provided on the other end side of the pre-filter 31 in the axial direction. Further, a side surface portion 53 extending from the bottom surface portion 51 toward the opening portion 52 is provided between the bottom surface portion 51 and the opening portion 52 .

<pleats>
As mainly shown in FIGS. 6 to 8 , the side portion 53 is provided with a plurality of pleats 60 extending between the bottom portion 51 and the opening portion 52 . That is, each pleat 60 extends in the axial direction of the pre-filter 31 . In other words, each pleat 60 extends vertically. Moreover, the plurality of pleats 60 are arranged at predetermined intervals along the circumferential direction of the pre-filter 31 . These pleats 60 increase the surface area (filtering area) of the pre-filter 31 without increasing the outer dimensions (volume) of the pre-filter 31 .

Please refer to FIGS. 9A and 9B. Each pleat 60 is formed by a plurality of folded portions 70 provided on the side portion 53 . Specifically, each pleat 60 is formed by two folded portions 71 and 72 that overlap each other.

The folded portions 71 and 72 are part of the side surface portion 53 folded (folded) in the circumferential direction of the pre-filter 31 . The two folded portions 71 and 72 overlap each other in the radial direction of the pre-filter 31, thereby folding the pre-filter 31 into three layers. More specifically, the folded portion 71 is located below (inside) the folded portion 72 . From another point of view, the folded portion 72 covers the top (outside) of the folded portion 71 . Therefore, in the following description, the folded portion 71 may be called the "inner folded portion 71" and the folded portion 72 may be called the "outer folded portion 72".

Incidentally, the folded portions 71 and 72 have a common portion. That is, part of the inner folded part 71 is also part of the outer folded part 72 , and part of the outer folded part 72 is also part of the inner folded part 71 .

As described above, FIG. 9A is a partially enlarged cross-sectional view of the prefilter 31 taken along line aa in FIG. Therefore, FIG. 9A shows the ends of the folded portions 71 and 72 forming the pleat 60 on the side of the bottom portion 51 . That is, FIG. 9A shows a cross section of the lower ends of the folded portions 71 and 72 .

On the other hand, FIG. 9B is a partially enlarged sectional view of the pre-filter 31 taken along line bb in FIG. Therefore, FIG. 9B shows the ends of the folded portions 71 and 72 forming the pleat 60 on the side of the opening 52 . That is, FIG. 9B shows a cross section of the upper ends of the folded portions 71 and 72 .

In the following description, the lower end portions of the folded portions 71 and 72 shown in FIG. 9A may be called "first overlapping portions 81" to distinguish them from other portions of the folded portions 71 and 72 in some cases. Also, the upper end portions of the folded portions 71 and 72 shown in FIG. 9B may be called "second overlapping portions 82" to distinguish them from other portions of the folded portions 71 and 72 in some cases.

Each first overlapping portion 81 is sewn to the periphery of the bottom portion 51 of the pre-filter 31 shown in FIG. On the other hand, each second overlapping portion 82 is sewn to the frame member 54 shown in FIG.

From another point of view, the upper end of each pleat 60 is sewn to the frame member 54 so that the two folded portions 71 and 72 are restrained in an overlapping state, and the lower end of each pleat 60 is sewn to the bottom portion 51. The two folded-back portions 71 and 72 are restrained in an overlapping state. On the other hand, other portions of the pleats 60, except for the top and bottom ends, are unconstrained. Thus, over most of the length of the pleat 60, the two folds 71, 72 are spaced apart, or at least can be spaced apart. For example, in the longitudinal central region of the pleat 60 shown in FIG. 10, the two turn-up portions 71, 72 are most widely separated. Alternatively, in the longitudinal central region of the pleat 60 shown in FIG. 10, the two folded portions 71 and 72 are most likely to be spaced apart.

<Frame member>
As shown in FIG. 4 , the frame member 54 is made of synthetic resin and has a substantially rectangular shape, and can hold the shape of the opening 52 of the pre-filter 31 . As shown in FIG. 3, the frame member 54 is integrally formed with a flange portion 54a that can be locked to the edge of the opening 12 of the tank 10. As shown in FIG. As shown in FIG. 2, when the flange portion 54a of the frame member 54 is engaged with the edge of the opening 12 of the tank 10, the pre-filter 31 is suspended inside the tank 10. As shown in FIG.

As shown in FIG. 3, the dust filter 33 is provided with a flange portion 33a similar to the flange portion 54a of the prefilter 31. As shown in FIG. As shown in FIG. 2, the flange portion 33a of the dust filter 33 is overlapped with the flange portion 54a of the pre-filter 31 that is engaged with the edge of the opening 12 of the tank 10, and the flange portion 54a and the opening portion 12 are aligned. locked to the rim. Furthermore, the flange portion 54a and the flange portion 33a locked to the edge of the opening 12 are sandwiched between the tank 10 and the head 20 (head cover 21).

<Width of overlapping part>
Please refer to FIGS. 9A and 9B again. The width W1 of the first overlapped portion 81 is narrower than the width W2 of the second overlapped portion 82 . The width W1 of the first overlapping portion 81 corresponds to the length of the first overlapping portion 81 along the circumferential direction. Also, the width W2 of the second overlapping portion 82 corresponds to the length of the second overlapping portion 82 along the circumferential direction.

Viewed another way, the width of the lower side of each pleat 60 is narrower than the width of the upper side. More specifically, the width of each pleat 60 gradually narrows from the upper side (the opening side of the pre-filter 31) toward the lower side (the bottom side of the pre-filter 31) (see FIG. 6).

When the width W1 of the first overlapped portion 81 is narrower than the width W2 of the second overlapped portion 82, the crease of the folded portion 70 is inclined in the circumferential direction with respect to the axial direction. In this embodiment, as shown in FIG. 6, both the fold line 71a of the folded portion 71 and the fold line 72a of the folded portion 72 are inclined in the circumferential direction with respect to the axial direction. More specifically, the fold line 71a and the fold line 72a are slanted in opposite directions with respect to the axial direction, and approach each other as the bottom surface portion 51 is approached.

Here, when the fan 23 shown in FIG. 2 operates, the pre-filter 31 and the filter damper 40 are deformed (contracted) by the suction force of the fan 23 . On the other hand, when the fan 23 stops, the pre-filter 31 and the filter damper 40 are restored (expanded). In this embodiment, the width of the lower side and the width of the upper side of each pleat 60 provided in the pre-filter 31 are different. Specifically, the width W1 of the first overlapping portion 81 and the width W2 of the second overlapping portion 82 of the folded portions 71 and 72 forming each pleat 60 are different. Therefore, when the pre-filter 31 is deformed (contracted) by the suction force of the fan 23 , many fine wrinkles are likely to be formed on the outer surface of the pre-filter 31 . The fine wrinkles formed on the outer surface of the pre-filter 31 stretch as the pre-filter 31 restores (expands). As a result, dust adhering to the outer surface of the pre-filter 31 is likely to drop (strip off). That is, dust is less likely to deposit or accumulate on the outer surface of the pre-filter 31 . Therefore, the dust collection performance of the pre-filter 31 is maintained for a long period of time, and the frequency of cleaning and replacement of the pre-filter 31 is reduced. The dust that has fallen (flaked off) from the outer surface of the pre-filter 31 is stored in the tank 10 .

Furthermore, in the present embodiment, since the width W1 of the first overlapping portion 81 is narrower than the width W2 of the second overlapping portion 82, the dust that has fallen (flaked off) from the outer surface of the pre-filter 31 will reach the inside of the first overlapping portion 81. It is difficult to deposit or accumulate. More specifically, dust falling from above is less likely to be caught by the first overlapping portion 81 . Therefore, the frequency of cleaning and replacement of the pre-filter 31 is further reduced.

From the viewpoint of improving the dust collection performance and maintainability as described above, in the longitudinal central region of the pleat 60 shown in FIG. It is preferable that the (filtration area) can be enlarged. Specifically, the width W1 of the first overlapping portion 81 shown in FIG. 9A is preferably 10% or less of the total length L of the side portion 53 shown in FIG. Here, the total length L of the side portion 53 corresponds to the length of the side portion 53 along the axial direction. Incidentally, the total length L of the side surface portion 53 in this embodiment is 210 mm, and the width W1 of the first overlapping portion 81 is 12 mm.

<Modification 1 of pre-filter>
FIG. 11 is a side view of another pre-filter 31a that can replace the pre-filter 31. FIG. 12A is a partially enlarged sectional view of the pre-filter 31a along line cc in FIG. 11, and FIG. 12B is a partially enlarged sectional view of pre-filter 31a along line dd in FIG. 13 is a partially enlarged cross-sectional view of the pre-filter 31a taken along line nn in FIG.

That is, FIG. 12A shows a cross-section of the lower ends of the folded portions 71 and 72 forming the pleats 60 . On the other hand, FIG. 12B shows a cross section of the upper ends of the folded portions 71 and 72 forming the pleats 60 . FIG. 13 also shows a cross section of the central region in the longitudinal direction of the folded portions 71 and 72 forming the pleat 60. As shown in FIG.

As shown in FIGS. 12A and 12B, the folded portions 70 forming the pleats 60 of the pre-filter 31a are folded in opposite directions. Specifically, the folding direction of the lower ends of the folded portions 71 and 72 forming the first overlapping portion 81 (FIG. 12A) and the folding portion forming the second overlapping portion 82 (FIG. 12B) The folding direction of the upper ends of 71 and 72 is opposite.

As a result, as shown in FIG. 11, the folding line 72a of the folded portion 72 is inclined in the circumferential direction with respect to the axial direction. On the other hand, the folding line 71a of the folded portion 71 is parallel to the axial direction. That is, among the plurality of folded portions 70 forming the pleats 60, the fold of at least one folded portion 70 is inclined in the circumferential direction with respect to the axial direction.

In addition, in the central region in the longitudinal direction of the folded portions 71 and 72 (pleats 60) shown in FIG. is solved.

The width W3 of the first overlapping portion 81 shown in FIG. 12A and the width W4 of the second overlapping portion 82 shown in FIG. 12B are the same.

As described above, the pre-filter 31a is provided with a plurality of pleats 60 whose folding directions are reversed vertically. Therefore, like the pre-filter 31, many fine wrinkles are likely to be formed on the outer surface when deformed (shrinked).

<Modification 2 of pre-filter>
FIG. 14 is a side view of another pre-filter 31b that can replace the pre-filter 31. FIG. 15A is a partially enlarged sectional view of the pre-filter 31b along line ee in FIG. 14, and FIG. 15B is a partially enlarged sectional view of pre-filter 31b along line ff in FIG. 15A shows a cross section of the lower ends of the folded portions 71, 72 forming the pleat 60. FIG. On the other hand, FIG. 15B shows a cross section of the upper ends of the folded portions 71 and 72 forming the pleat 60. As shown in FIG.

The width W5 of the first overlapping portion 81 and the width W6 of the second overlapping portion 82 of the folded portions 71 and 72 shown in FIGS. 15A and 15B are the same. The folding directions of the first overlapping portion 81 and the second overlapping portion 82 are the same. That is, the folded portions 71 and 72 forming each pleat 60 of the pre-filter 31b have the same folded width and direction.

However, as shown in FIG. 14, the first overlapping portions 81 and the second overlapping portions 82 of the folded portions 71 and 72 forming the pleats 60 of the pre-filter 31b are located at different positions in the circumferential direction. . More specifically, the position of the first overlapping portion 81 and the position of the second overlapping portion 82 are shifted in the circumferential direction.

As a result, both the fold line 71a of the folded portion 71 and the fold line 72a of the folded portion 72 are inclined in the circumferential direction with respect to the axial direction. However, the folds 71a and 72a are parallel to each other.

As described above, the pre-filter 31b is provided with a plurality of pleats 60 whose upper end positions and lower end positions are displaced in the circumferential direction. Therefore, like the pre-filter 31, many fine wrinkles are likely to be formed on the outer surface when deformed (shrinked). In addition, the probability that dust falling from above is caught on the lower ends of the pleats 60 (the first overlapping portions 81) is low.

The present invention is not limited to the above embodiments, and can be modified in various ways without departing from the scope of the invention. For example, the width W1 of the first overlapping portion 81 and the width W2 of the second overlapping portion 82 can be changed arbitrarily. Also, the ratio between the width W1 of the first overlapping portion 81 shown in FIG. 9A and the width W2 of the second overlapping portion 82 shown in FIG. 9B can be changed arbitrarily.

The inclination angles of the folds 71a and 72a with respect to the axial direction can be arbitrarily changed. For example, if the positions of the first overlapped portion 81 and the second overlapped portion 82 shown in FIG. 14 are further shifted, the inclination angle of the folds 71a and 72a with respect to the axial direction increases.

DESCRIPTION OF SYMBOLS 1... Working machine (dust collector) 10... Tank 11... Suction port 12... Opening part 13... Caster 14... Clamp 20... Head 21... Head cover 21a... Intake port 21b... Exhaust port 22... Electric motor 23 Fan 30 Filter 31, 31a, 31b Primary filter (pre-filter) 32 Secondary filter (cross filter) 33 Tertiary filter (dust filter) 33a Flange 40 Restoration Member (filter damper) 51 Bottom portion 52 Opening 53 Side portion 54 Frame member 54a Flange portion 60 Pleats 70, 71, 72 Folded portion 71a, 72a Folds 81... First overlapping portion, 82... Second overlapping portion, L... Overall length, W1, W2, W3, W4, W5, W6... Width, X... Straight line

Claims (9)

a driving source;
a fan rotationally driven by the drive source;
a head containing the drive source and the fan and having an air inlet;
a tank having a suction port and on which the head is mounted;
a filter connected to the head so as to cover the air inlet and capable of collecting dust contained in air sucked from the air inlet and flowing into the air inlet;
The filter includes a bottom portion closing one end in the axial direction, an opening provided at the other end in the axial direction and connected to the intake port, and extending from the bottom portion toward the opening. formed in a bag shape by a side portion that
A plurality of pleats extending between the bottom surface portion and the opening portion are provided along the circumferential direction on the side surface portion of the filter,
Each of the pleats is formed by a plurality of folded portions folded back in the circumferential direction and overlapping in the radial direction,
The working machine, wherein at least one fold line of the plurality of folded portions forming each of the pleats is inclined in the circumferential direction with respect to the axial direction. Each of the pleats includes a first overlapping portion formed by ends of the plurality of folded portions on the bottom portion side, and a second overlapping portion formed by ends of the plurality of folded portions on the opening portion side. a superimposed portion;
The working machine according to claim 1, wherein the width of the first overlapping portion is narrower than the width of the second overlapping portion. Each of the pleats includes a first overlapping portion formed by ends of the plurality of folded portions on the bottom portion side, and a second overlapping portion formed by ends of the plurality of folded portions on the opening portion side. a superimposed portion;
The folding direction of the end portion of the folded portion forming the first overlapping portion is opposite to the folding direction of the end portion of the folded portion forming the second overlapping portion. The working machine according to claim 1. Each of the pleats includes a first overlapping portion formed by ends of the plurality of folded portions on the bottom portion side, and a second overlapping portion formed by ends of the plurality of folded portions on the opening portion side. a superimposed portion;
The working machine according to claim 1, wherein a position of said first overlapping portion and a position of said second overlapping portion are shifted in said circumferential direction. The filter includes a frame member capable of holding the shape of the opening and engaging with the edge of the tank,
each of the first overlapping portions is sewn to the bottom portion;
The work machine according to any one of claims 2 to 4, wherein each of said second overlapping portions is sewn to said frame member. The working machine according to any one of claims 2 to 5, wherein the width of the first overlapping portion is 10% or less of the total length of the side portion. Having a restoring member disposed inside the filter,
The working machine according to any one of claims 1 to 6, wherein the restoring member restores the filter deformed by the suction force of the fan when the fan is stopped. The working machine according to any one of claims 1 to 7, further comprising another filter arranged inside said filter and capable of collecting dust contained in the air that has passed through said filter. A filter connected to a work machine so as to cover an air intake of the work machine and capable of collecting dust contained in air flowing into the air intake,
a bottom portion that closes one end in the axial direction; an opening that is provided at the other end in the axial direction and is connected to the intake port; and side portions that extend from the bottom portion toward the opening. , formed into a bag shape by
A plurality of pleats extending between the bottom surface portion and the opening portion are provided along the circumferential direction on the side surface portion,
Each of the pleats is formed by a plurality of folded portions folded back in the circumferential direction and overlapping in the radial direction,
A filter, wherein at least one fold of the plurality of folded portions forming each of the pleats is inclined in the circumferential direction with respect to the axial direction.

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