Backpack dust collector

Abstract

Backpack dust collector (1) with a housing (2) comprising a suction connection (3); a dust collection chamber (13) connected to the suction port (3) and designed to accommodate a dust collection bag (18); a motor chamber (15) connected to the dust collection chamber (13) and housing a fan (31) and a motor (32); and an outlet port (17) through which air is discharged from the motor chamber (15); a slotted portion (40) located in a flow path (16) between the motor chamber (15) and the outlet port (17) and comprising at least one slotted passage (41) through which air passes from the motor chamber (15); and a sound absorbing component (42) located in at least part of a flow path (16B) between the passage (41) and the outlet port (17), wherein the housing (2) comprises a base housing (20) and a plate (23) connected to the base housing (20), and the flow path (16B) between the passage (41) and the outlet connection (17) is defined between the base housing (20) and the plate (23), characterized in that the base housing (20) comprises a recessed portion (24) which is recessed towards the rear, the plate (23) is positioned so that it covers an opening of the recessed portion (24), the flow path (16B) is defined between an inner surface (24A) of the recessed portion (24) and a rear surface (23B) of the plate (23), and the sound absorbing member (42) is fixed to the inner surface (24A) of the recessed portion (24) and the rear surface (23B) of the plate (23).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

[0001] The invention relates to a backpack dust collector. 2. Description of related technology

[0002] A backpack dust collector includes a fan and a motor designed to generate motive power to rotate the fan. Rotating the fan draws air containing dust through a suction port of the backpack dust collector. The air drawn through the suction port flows through an interior of the backpack dust collector and is then discharged through an outlet port. An example of related art is described in JP 2017-018567 A.

[0003] Noise generated by the backpack dust collector causes a user of the backpack dust collector to experience discomfort. US 2007 / 0 174 992 A1 discloses a backpack dust collector with the features of the preamble of claim 1. US 2014 / 0 096 339 A1 and DE 14 03 623 A disclose other backpack dust collectors of the same type.

[0004] One object of the invention is to suppress the generation of sound. SUMMARY OF THE INVENTION

[0005] The aforementioned object is achieved by a backpack dust collector having the features of claim 1. Advantageous further developments are set forth in the subclaims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of a backpack dust collector according to a first embodiment; Fig. 2 is a side view of the backpack dust collector according to the first embodiment; Fig. 3 is a sectional view of the backpack dust collector according to the first embodiment; Fig. 4 is a front view of the backpack dust collector according to the first embodiment; Fig. 5 is a perspective view of the backpack dust collector according to the first embodiment; Fig. 6 is a sectional view of the vicinity of a drive unit according to the first embodiment; Fig. 7 is a diagram illustrating the vicinity of an exhaust port according to the first embodiment; Fig. 8 is a diagram illustrating the exhaust port according to the first embodiment as viewed from below; Fig. 9 is a sectional view of a dust collecting bag according to the first embodiment; Fig. 10 is a diagram for describing a movement of a vibration device according to the first embodiment; Fig. 11 is a diagram for describing a movement of an operating member according to the first embodiment; Fig. 12 is a plan view schematically illustrating a movement when batteries are attached to battery attachment portions according to the first embodiment; Fig. 13 is a diagram schematically illustrating a state in which a battery according to the first embodiment is attached to a battery attachment portion; Fig. 14 is a diagram schematically illustrating passages according to a second embodiment; Fig. 15 is a sectional view of the vicinity of a drive unit according to a third embodiment; and Fig. 16 is a perspective view of a dust collector according to a fourth embodiment not part of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] Embodiments of the invention will now be described with reference to the drawings. However, the invention is not limited to these embodiments. Components according to the respective embodiments can be combined as appropriate. Some components may be omitted.

[0007] In the following description, the terms "left," "right," "front," "back," "top," and "bottom" are used to describe the positional relationships of the respective components. These terms indicate relative positions or directions with respect to an operator WM. First embodiment

[0008] Fig. 1 is a side view of a backpack dust collector 1 according to the present embodiment. As shown in Fig. As shown in Figure 1, the backpack dust collector 1 is used while worn on the back of an operator WM. The backpack dust collector 1 comprises a housing 2, a hose 4 connected to a suction port 3 of the housing 2, a pipe 5 connected to the hose 4, a nozzle 6 connected to the pipe 5, one or more battery mounting sections 8, to each of which a universal battery 7 is attached, and an operating unit 9.

[0009] The universal battery 7 can be used as a power supply for various types of electrical machines and devices. The universal battery 7 can be used as a power supply for a power tool. The universal battery 7 can also be used as a power supply for electrical machines and devices other than the power tool. The universal battery 7 can also be used as a power supply for a dust collector other than the backpack dust collector 1 according to the present embodiment. In the following description, the universal battery 7 will be referred to as "battery 7" as appropriate.

[0010] The housing 2 is worn on the back of the operator WM. The housing 2 is attached to the back of the operator WM with shoulder straps 10A and a lap belt 10B. The shoulder straps 10A are attached to the shoulders of the operator WM. The lap belt 10B is attached to the pelvis of the operator WM.

[0011] The housing 2 has an interior space. The housing 2 has a front surface 2A facing the front, a rear surface 2B facing the rear, an upper surface 2C facing the upper direction, a lower surface 2D facing the lower direction, a left side surface 2E facing the left direction, and a right side surface 2F facing the right direction. In a state where the housing 2 is worn on the back of the operator WM, the front surface 2A of the housing 2 faces the back of the operator WM.

[0012] The suction port 3 is located in an upper section of the housing 2. The hose 4 is flexible. One end of the hose 4 is connected to the suction port 3. The other end of the hose 4 is connected to one end of the pipe 5. The nozzle 6 is connected to the other end of the pipe 5. The nozzle 6 has a suction opening.

[0013] The housing 2 includes battery openings 11 through which the corresponding batteries 7 can pass, and battery receiving portions 12, each connected to the battery openings 11. Each battery 7 is received by the corresponding battery receiving portion 12. Each battery opening 11 is formed at a lower portion of the housing 2. Each battery mounting portion 8 is arranged in the corresponding battery receiving portion 12.

[0014] The control unit 9 is operated by the operator WM. The control unit 9 includes a switch for starting the backpack dust collector 1. The control unit 9 can be attached to the lap belt 10B.

[0015] Fig. 2 is a side view of the backpack dust collector 1 according to the present embodiment. Fig. 3 is a sectional view of the backpack dust collector 1 according to the present embodiment taken along a line AA in Fig. 2. Fig. 4 is a front view of the backpack dust collector 1 according to the present embodiment. Fig. 5 is a perspective view of the backpack dust collector 1 according to the present embodiment.

[0016] The housing 2 comprises a base housing 20 having an interior space and a plate 23 connected to the base housing 20. The base housing 20 comprises a front housing 21 and a rear housing 22. The front housing 21 and the rear housing 22 are connected to each other. The plate 23 is connected to the front housing 21. The plate 23 is fixed to the front housing 21 with a plurality of threaded projections 25. In Fig. 4 and Fig. 5, plate 23 is indicated by an imaginary line.

[0017] The front housing 21 includes a part of the upper surface 2C, a part of the lower surface 2D, a part of the left side surface 2E, and a part of the right side surface 2F. The rear housing 22 includes the rear surface 2B, a part of the upper surface 2C, a part of the lower surface 2D, a part of the left side surface 2E, and a part of the right side surface 2F. A rear end portion of the front housing 21 and a front end portion of the rear housing 22 are connected to each other, thereby defining the interior of the main housing 20.

[0018] The front housing 21 has a recessed portion 24 formed therein. The recessed portion 24 is recessed rearwardly in a lower portion of the front housing 21. The plate 23 is positioned to cover the opening of the recessed portion 24. The plate 23 encompasses the front surface 2A. In a state where the housing 2 is worn on the back of the operator WM, the plate 23 faces toward the back of the operator WM.

[0019] The housing 2 comprises the suction port 3, a dust collection chamber 13 connected to the suction port 3, a motor chamber 15 connected to the dust collection chamber 13 with a flow path 14 interposed therebetween, and an outlet port 17 connected to the motor chamber 15 with a flow path 16 interposed therebetween.

[0020] The dust collection chamber 13, the flow path 14, the motor chamber 15, and a portion of the flow path 16 are defined in the interior of the base housing 20. A portion of the flow path 16 is defined between the recessed portion 24 of the front housing 21 and the plate 23.

[0021] The dust collection chamber 13 is located in an upper portion of the interior of the main housing 20. The dust collection chamber 13 is defined by a partition wall 13W arranged in at least part of the periphery of the dust collection chamber 13. The dust collection chamber 13 houses a dust collection bag 18. The dust collection bag 18 is connected to the suction port 3. The dust collection bag 18 is, for example, a paper bag. The dust collection bag 18 is designed to capture and collect dust.

[0022] The motor chamber 15 is located below the dust collection chamber 13 in the interior of the base housing 20. The motor chamber 15 is defined by a partition wall 15W disposed in at least a portion of the periphery of the motor chamber 15. The motor chamber 15 houses a drive unit 30 comprising a fan 31 and a motor 32.

[0023] The flow path 14 is located in a right-hand portion of the interior of the base housing 20. The flow path 14 is defined by a partition wall 14W arranged in at least a portion of the circumference of the flow path 14. The flow path 14 extends in an up-down direction. The flow path 14 connects a right-hand portion of the dust collection chamber 13 and a right-hand portion of the motor chamber 15.

[0024] A filter 19 is located at a boundary between the dust collection chamber 13 and the flow path 14. The filter 19 is, for example, a high-efficiency particulate air (HEPA) filter. The filter 19 is located on one side of the dust collection chamber 13. In the present embodiment, the filter 19 is located on the right side of the dust collection chamber 13. The filter 19 extends in the up-down direction. The filter 19 is positioned so that it faces the dust collection chamber 13.

[0025] The flow path 16 connects the motor chamber 15 and the outlet port 17. Air from the motor chamber 15 is discharged to a space outside the housing 2 through the outlet port 17.

[0026] Fig. 6 is a sectional view of the vicinity of the drive unit 30 according to the present embodiment. As shown in Fig. As shown in Figure 6, the drive unit 30 includes the blower 31, the motor 32 configured to generate motive power to rotate the blower 31, a blower cover 33 that houses the blower 31, a motor shell 34 that supports the motor 32, a damper 36 that surrounds the motor shell 34, a motor support 37 that supports the motor shell 34, and a support ring 38 that surrounds the blower cover 33. The drive unit 30 is housed in the motor chamber 15.

[0027] The fan 31 is rotatable about a rotation axis AX. The fan 31 is located in the motor chamber 15 below the dust collection chamber 13, so that the rotation axis AX is perpendicular to the up-down direction. The rotation axis AX of the fan 31 extends in a right-left direction. An output shaft 32S of the motor 32 is coupled to the fan 31. The rotation axis of the motor 32 corresponds to the rotation axis AX of the fan 31. By driving the motor 32, the fan 31 is rotated about the rotation axis AX.

[0028] The motor shell 34 surrounds the motor 32. The damper 36 absorbs the sound generated by the motor 32. In other words, the damper 36 has a sound-absorbing function. Examples of the damper 36 include a sponge.

[0029] The motor support 37 and the support ring 38 are both elastic components, such as rubber. The motor shell 34 is fixed to the housing 2 with the motor support 37 and the support ring 38 sandwiched between them.

[0030] The backpack dust collector 1 includes a control board 35 located in the motor chamber 15. In the present embodiment, the control board 35 serves as a partition wall defining the motor chamber 15. The control board 35 is located on the left side of the motor 32. The control board is located downstream of the motor 32, so that a surface of the control board 35 is perpendicular to the rotation axis AX of the fan 31.

[0031] Fig. 7 is a diagram illustrating the vicinity of the exhaust port 17 according to the present embodiment. Fig. Fig. 8 is a diagram illustrating the outlet port 17 according to the present embodiment as viewed from below. In Fig. 7, plate 23 is indicated by an imaginary line.

[0032] The backpack dust collector 1 comprises a slotted section 40 located in the flow path 16 between the motor chamber 15 and the outlet port 17 and having one or more slotted passages 41 through which air from the motor chamber 15 passes.

[0033] The slot portion 40 is provided on at least a part of the housing 2. In the present embodiment, the slot portion 40 is provided on the front housing 21. In other words, the passages 41 are formed in a part of the front housing 21.

[0034] The passage 41 is narrow and long in the right-left direction. The longitudinal direction of the passage 41 corresponds to the right-left direction, and the width direction of the passage 41 corresponds to the up-down direction. The passages 41 are aligned in the up-down direction. A rib 43 is provided between the adjacent passages 41.

[0035] The slotted portion 40 is located in the flow path 16 between the motor chamber 15 and the outlet port 17. The ribs 43 of the slotted portion 40 divide the flow path 16 into a flow path 16A near the motor chamber 15 and a flow path 16B near the outlet port 17. The flow path 16A between the motor chamber 15 and the slotted portion 40 is defined in the interior of the base housing 20. As shown in Fig. 3 and Fig. 6, the flow path 16A is defined by a partition wall 16W disposed in at least a portion of the circumference of the flow path 16A. The flow path 16B between the slot portion 40 and the outlet port 17 is defined between the recessed portion 24 of the front housing 21 and the plate 23.

[0036] The width-direction dimension of each passage 41 is small. The width-direction dimension of the passage 41 is so small that foreign matter in a space outside the housing 2 is prevented from entering the interior (flow path 16A) of the housing 2.

[0037] The flow path 16B extends in the up-down direction. The flow path 16B is defined between an inner surface 24A of the recessed portion 24 of the front housing 21 and a rear surface 23B of the plate 23. The outlet port 17 is defined in a lower end portion of the flow path 16B. In other words, the outlet port 17 is defined by a lower end portion of the inner surface 24A of the recessed portion 24 and a lower end portion of the rear surface 23B of the plate 23.

[0038] In a state where the housing 2 is worn on the back of the operator WM, the ports 41 face in a lateral direction. In the present embodiment, the ports 41 face toward the right. In the state where the housing 2 is worn on the back of the operator WM, the outlet port 17 faces downward.

[0039] The backpack dust collector 1 comprises a sound absorbing component 42 which is located in at least a part of the flow path 16B between the passages 41 and the outlet port 17.

[0040] As in Fig. 7 and Fig. As shown in Figure 8, the sound absorbing member 42 is positioned facing the apertures 41. The sound absorbing member 42 faces the direction of each aperture 41. At least a portion of the sound absorbing member 42 is fixed to the inner surface 24A of the recessed portion 24. At least a portion of the sound absorbing member 42 is fixed to the rear surface 23B of the plate 23.

[0041] The sound-absorbing member 42 comprises a porous member. The sound-absorbing member 42 absorbs sound transmitted through air to suppress noise generation. Examples of sound generated by the backpack dust collector 1 include wind noise generated when air passes through the vents 41 and NZ noise generated by the rotation of the fan 31.

[0042] The sound-absorbing component 42 is an open-cell porous component. The sound-absorbing component 42 has numerous very small cells. Open-cell means that the cells are interconnected. Examples of open-cell porous components include at least one of soft urethane foam, glass wool, rock wool, and fur.

[0043] The open cell has a sound-absorbing function. Sound impacts the cells on one surface of the sound-absorbing component 42. The sound impacting the cells on the surface of the sound-absorbing component 42 spreads to neighboring cells. The sound impacts the inner surfaces of the cells. The cells are interconnected. The sound spreads to other cells while reflecting off the inner surfaces of the cells. The energy of the sound is attenuated by repeatedly impacting the inner surfaces of the cells. Thus, the sound is reduced.

[0044] As in Fig. As shown in Figure 7, the distance D1 between each aperture 41 and the sound-absorbing member 42 is shorter than the distance D2 between the aperture 41 and the outlet port 17. The distance D2 is at least twice as long as the distance D1. The distance D1 is a distance between the center of the aperture 41 in the longitudinal direction of the aperture 41 and the sound-absorbing member 42.

[0045] The fan 31 rotates around the rotation axis AX, thereby generating a suction force at the suction port 3. Air containing dust, which has been sucked through the suction opening of the nozzle 6 by generating the suction force at the suction port 3, passes through the pipe 5 and the hose 4.

[0046] As if by arrows in Fig. 3, Fig. 6 and Fig. 7, the air that has passed through the pipe 5 and the hose 4 is introduced into the dust collection chamber 13 through the suction port 3. The dust collection bag 18 is connected to the suction port 3. Dust contained in the air is trapped and collected by the dust collection bag 18. The air passes through the dust collection bag 18. The air that has passed through the dust collection bag 18 passes through the filter 19. The filter 19 traps and collects fine dust that cannot be trapped by the dust collection bag 18. The air that has passed through the filter 19 passes through the flow path 14 and then flows into the motor chamber 15. The air that has flowed into the motor chamber 15 passes through the fan 31 and the motor 32, comes into contact with the control board 35, and then flows into the flow path 16A. The air that has flowed through the flow path 16A passes through the passages 41 and flows into the flow path 16B.The air that has flowed through the flow path 16B is discharged through the outlet port 17.

[0047] The slit-shaped passages 41 prevent foreign matter from entering the flow path 16A. Air flowing through the passages 41 can generate noise, such as wind noise. In the present embodiment, the sound-absorbing member 42 is located downstream of the passages 41. The sound-absorbing member 42 suppresses the generation of such noise.

[0048] Fig. 9 is a sectional view of the dust collecting bag 18 according to the present embodiment. As shown in Fig. As shown in Fig. 9, when dust has accumulated in the dust collection bag 18, a load due to the weight of the dust is applied to the bottom surface of the dust collection chamber 13 from the dust collection bag 18. In the present embodiment, the filter 19 is located on one side of the dust collection chamber 13 so as to face the dust collection chamber 13 in a state where the casing 2 is worn on the back of the operator WM. In the present embodiment, the filter 19 is located on the right side of the dust collection chamber 13. This prevents the filter 19 from being clogged by the dust collection bag 18 even when dust has accumulated in the dust collection bag 18. Since the filter 19 is prevented from being clogged, a reduction in the suction force of the backpack dust collector 1 is suppressed.

[0049] The backpack dust collector 1 comprises a vibration device 50 designed to vibrate the dust collection bag 18. As shown in Fig. As shown in Fig. 9, at least some dust may adhere to an upper portion of the inner surface of the dust collection bag 18. When dust adheres to the upper portion of the inner surface of the dust collection bag 18, the flow rate of air passing through the dust collection bag 18 decreases, whereby the suction power of the backpack dust collector 1 may be reduced. When the vibration device 50 vibrates the dust collection bag 18, the dust adhering to the upper portion of the inner surface of the dust collection bag 18 is shaken off and accumulates in a lower portion of the dust collection bag 18. Thus, a reduction in the suction power of the backpack dust collector 1 is suppressed.

[0050] In the present embodiment, the vibration device 50 comprises a support member 51 supported by elastic members 52 and having a support surface 51S that can be brought into contact with the dust collecting bag 18.

[0051] The support component 51 is a plate-like component. As shown in Fig. 9, the support member 51 is located below the dust collection bag 18 in the dust collection chamber 13. The support surface 51S includes an upper surface of the support member 51 that can be brought into contact with a lower portion of the dust collection bag 18.

[0052] The elastic members 52 are, for example, coil springs. The elastic members 52 support a lower surface of the support member 51. In the present embodiment, the elastic members 52 are supported by the partition wall 15W and the partition wall 16W, which are located below the support member 51. The support member 51 is supported by the partition wall 15W and the partition wall 16W with the elastic members 52 interposed therebetween. The elastic members 52 support the support member 51 in a pivotable manner.

[0053] The backpack dust collector 1 includes an operating member 53 for moving the support member 51. The operating member 53 is operated by the operator WM. An upper end portion of the operating member 53 is arranged to face toward a lower surface of the support member 51. A lower end portion of the operating member 53 is arranged outside the housing 2. An intermediate portion of the operating member 53 is coupled to at least a part of the housing 2 by a hinge 54.

[0054] Fig. 10 is a diagram for describing a movement of the vibration device 50 according to the present embodiment. When the operator WM moves or walks while carrying the case 2 on his back, the case 2 moves accordingly. When the case 2 moves, the support member 51 supported by the elastic members 52 vibrates with an amplitude greater than the amplitude of the case 2. When the case 2 moves, vibrations of the case 2 are transmitted to the support member 51 in an amplified manner due to the action of the elastic members 52. When the support member 51 vibrates strongly, the dust collection bag 18 supported by the support member 51 vibrates strongly accordingly. When the dust collection bag 18 vibrates strongly, dust adhering to an upper portion of the inner surface of the dust collection bag 18 is shaken off and accumulates in a lower portion of the dust collection bag 18, as shown in Fig. 10. This suppresses a reduction in the suction power of the backpack dust collector 1.

[0055] Fig. 11 is a diagram for describing a movement of the operating member 53 according to the present embodiment. As shown in Fig. As shown in Figure 11, the operator WM can operate the operating member 53 so that the operating member 53 rotates about the rotation axis of the joint 54. When the operating member 53 is operated, the upper end portion of the operating member 53 moves up and down while in contact with the support member 51. Thus, the support member 51 strongly vibrates up and down. When the support member 51 strongly moves up and down, the dust collection bag 18 supported by the support member 51 strongly moves. When the dust collection bag 18 strongly vibrates, dust adhering to an upper portion of the inner surface of the dust collection bag 18 is shaken off and accumulates in a lower portion of the dust collection bag 18, as shown in Figure 11. Fig. 11. This suppresses a reduction in the suction power of the backpack dust collector 1.

[0056] As in Fig. 2, Fig. 3, Fig. 5 and Fig. As shown in Fig. 6, the battery openings 11 are formed on the left side surface 2E and the right side surface 2F of the housing 2, respectively. The battery openings 11 and the battery receiving portions 12 are formed at lower portions of the housing 2.

[0057] Each battery mounting portion 8 is arranged on an upper surface of the corresponding battery receiving portion 12. The battery mounting portion 8 has guide rails 81 configured to guide the corresponding battery 7, and a connection terminal 82 configured to be connected to a battery terminal 72 of the battery 7. The guide rails 81 extend in the right-left direction. The pair of guide rails 81 are arranged in the front-rear direction. The pair of guide rails 81 are arranged in parallel. The connection terminal 82 is arranged between the pair of guide rails 81.

[0058] Battery 7 is a universal battery. Battery 7 may be a battery for a power tool. In the present embodiment, battery 7 may be used as a DC power supply for a power tool. Battery 7 includes a plurality of lithium-ion battery cells. Battery 7 may be charged by a battery charger. Battery 7 is portable. Battery 7 supplies power to at least motor 32.

[0059] The battery 7 has a pair of slide rails 71 to be guided through the guide rails 81, the battery connector 72 to be connected to the connection connector 82 of the battery fixing portion 8, and a release button 73.

[0060] The slide rails 71 are guided by the guide rails 81 of the battery mounting portion 8. The pair of slide rails 71 are arranged in parallel. The battery connector 72 is arranged between the pair of slide rails 71. In a state where the battery 7 is attached to the battery mounting portion 8, the battery connector 72 is connected to the connecting connector 82.

[0061] The release button 73 is operated to release the battery 7 fixed to the battery mounting portion 8. The release button 73 is provided on one end surface 7A of the battery 7. The battery 7 is fixed to the battery mounting portion 8 such that the release button 73 faces outward in the right-left direction relative to the center of the housing 2. In the state where the battery 7 is fixed to the battery mounting portion 8, the release button 73 faces toward the battery opening 11.

[0062] In the present embodiment, the battery mounting portion 8 in the battery receiving portion 12 is inclined downwardly with increasing distance from the battery opening 11. In other words, the battery mounting portion 8 is inclined downwardly toward a lower position in the battery receiving portion 12. The guide rails 81 are inclined downwardly in the battery receiving portion 12 with increasing distance from the battery opening 11.

[0063] The front housing 21 and the rear housing 22 have respective bottom plates 26 that define bottom surfaces 2P of the battery receiving portions 12. Each of the bottom surfaces 2P faces toward a portion of the lower surface of the battery 7 attached to the corresponding battery mounting portion 8. The bottom surfaces 2P are inclined downward in the battery receiving portion 12 with increasing distance from the battery opening 11. The bottom plate 26 of the front housing 21 is fixed to at least a portion of the front housing 21 with a rib interposed therebetween. The bottom plate 26 of the rear housing 22 is fixed to at least a portion of the rear housing 22 with a rib interposed therebetween. An opening 12K is formed in a lower portion of the battery receiving portion 12. The opening 12K is located between the bottom plate 26 of the front housing 21 and the bottom plate 26 of the rear housing 22.

[0064] The front housing 21 and the rear housing 22 include inner side plates 27 defining inner side surfaces 2Q connected to the battery openings 11. Each of the inner side surfaces 2Q faces toward a part of a side surface of the battery 7 passing through the battery opening 11. The inner side surfaces 2Q of the front housing 21 are inclined rearward in the battery receiving portion 12 as they become farther away from the respective battery openings 11. The inner side surfaces 2Q of the rear housing 22 are inclined forward in the respective battery receiving portions 12 as they become farther away from the respective battery openings 11. In other words, the width of a passage in the front-rear direction through which the battery 7 passes in the battery receiving portion 12 is smaller in the battery receiving portion 12 at a position farther away from the battery opening 11.

[0065] Fig. 12 is a top view schematically illustrating a movement when attaching the batteries 7 to the battery attachment portions 8 according to the present embodiment. When attaching the batteries 7 to the battery attachment portions 8, the operator WM inserts the batteries 7 into the battery receiving portions 12 through the battery openings 11 formed in the left side surface 2E and the right side surface 2F, respectively, thereby being able to attach the batteries 7 to the battery attachment portions 8.

[0066] When the operator WM attaches a battery 7 to the left battery attachment portion 8, the operator WM inserts the battery 7 into the battery opening 11 formed on the left side surface 2E. The operator WM slides the battery 7 to the right while causing the guide rails 81 of the battery attachment portion 8 to guide the slide rails 71 of the battery 7. When the battery 7 is slid to the right, the battery 7 is fixed to the battery attachment portion 8, and the battery terminal 72 of the battery 7 is connected to the connecting terminal 82 of the battery attachment portion 8. Thus, the battery 7 is attached to the battery attachment portion 8.

[0067] When the operator attaches a battery 7 to the right battery attachment portion 8, the operator inserts the battery 7 into the battery opening 11 formed on the right side surface 2F and then slides the battery to the left, thereby being able to attach the battery 7 to the battery attachment portion 8.

[0068] As in Fig. 2 and Fig. 12, in the present embodiment, the dimension W11 of each battery opening 11 in the front-to-rear direction is larger than the dimension W12 of the corresponding battery receiving portion 12 in the front-to-rear direction where the corresponding guide rails 81 are arranged. The dimension W11 corresponds to the distance between end portions of the pair of inner side surfaces 2Q closest to the battery opening 11. The dimension W12 corresponds to the distance between end portions of the pair of inner side surfaces 2Q closest to the guide rails 81. Since the dimension W11 of the battery opening 11 is large, the operator WM can smoothly insert the corresponding battery 7 into the battery opening 11. The operator WM can insert the battery 7 into the battery opening 11 while holding, for example, side surfaces of the battery 7.Since the dimension W12 of the battery receiving portion 12 is small, the battery 7 can be moved in the battery receiving portion 12 while being guided by the inner side surfaces of the battery receiving portion 12, which are located lower than the corresponding inner side plates 27, and also by the guide rails 81 in the battery receiving portion 12.

[0069] Moreover, since the corresponding bottom plate 26 is provided, the battery 7 can be prevented from falling out of the battery receiving portion 12 when the battery 7 is attached to the battery fixing portion 8 or when the battery 7 is pulled out from the battery fixing portion 8.

[0070] As in Fig. 3 and Fig. As shown in Figure 6, the backpack dust collector 1 includes moving mechanisms 74, each located in the corresponding battery receiving portion 12 and configured to generate a force for moving the corresponding battery 7 toward the corresponding battery opening 11. Each moving mechanism 74 is located at a position where it can be in contact with the corresponding battery 7.

[0071] The movement mechanism 74 includes an elastic member 74E. Examples of the elastic member 74E include a leaf spring. The elastic member 74E may include a coil spring.

[0072] The elastic member 74E is positioned so as to face the outer end surface 7B of the battery 7 in a state where the battery 7 is attached to the battery attachment portion 8. The elastic member 74E is positioned on the opposite surface 12A of the battery receiving portion 12. In the state where the battery 7 is attached to the battery attachment portion 8, the other end surface 7B of the battery 7 faces the opposite surface 12A. In the state where the battery 7 is attached to the battery attachment portion 8, the other end surface 7B of the battery 7 is in contact with the elastic member 74E.

[0073] Fig. 13 is a diagram schematically illustrating a state in which a battery 7 according to the present embodiment is attached to a battery attachment portion 8. The guide rails 81 of the battery attachment portion 8 are inclined downward in the corresponding battery receiving portion 12 as the distance from the battery opening 11 increases. In the state in which the battery 7 is attached to the battery attachment portion 8, the other end surface 7B of the battery 7 is in contact with the corresponding elastic member 74E. In the state in which the battery 7 is attached to the battery attachment portion 8, the elastic member 74E is elastically deformed by the battery 7. The thus elastically deformed elastic member 74E generates an elastic force for moving the battery 7 toward the battery opening 11.

[0074] When the operator WM removes the battery 7 from the battery mounting portion 8, he or she operates the corresponding release button 73. When the release button 73 is operated, the battery 7 fixed to the battery mounting portion 8 is released. When the battery 7 fixed to the battery mounting portion 8 is released, the battery 7 is moved toward the battery opening 11 by the elastic force generated by the elastic member 74E. By the elastic force generated by the elastic member 74E, at least a part of the battery 7, including one end surface 7A, is ejected from the battery receiving portion 12 through the battery opening 11. This allows the operator WM to easily hold the battery 7. While holding the battery 7 pulled out from the battery mounting portion 8, the operator WM can remove the battery from the battery receiving portion 12.

[0075] As described above, according to the present embodiment, the sound-absorbing member 42 is located in at least a portion of the flow path 16 between the passages 41 and the exhaust port 17. This suppresses the generation of sound. Furthermore, the slit portion 40 prevents foreign matter from entering the interior of the housing 2.

[0076] The sound-absorbing component 42 is positioned so that it faces the direction of the apertures 41. Thus, the sound-absorbing component 42 can effectively reduce wind noise generated when air passes through the apertures 41.

[0077] The distance D1 between the passage 41 and the sound absorbing member 42 is shorter than the distance D2 between the passage 41 and the outlet port 17. Thus, wind noise generated when air passes through the passages 41 can be effectively prevented from escaping to an exterior of the housing 2 through the outlet port 17.

[0078] The housing 2 comprises the base housing 20 and the plate 23, which is connected to the base housing 20. The flow path 16B between the slot portion 40 and the outlet port 17 is defined between the base housing 20 and the plate 23. This allows the base housing 20 and the plate 23 to be connected after the sound absorbing component 42 is provided in the flow path 16B.

[0079] In a state where the housing 2 is worn on the back of the operator WM, the vents 41 face in a lateral direction, and the exhaust port 17 faces downward. Thus, air that has passed through the vents 41 is discharged downward from the exhaust port 17.

[0080] The sound-absorbing component 42 includes the porous component. Thus, the sound-absorbing component 42 can effectively absorb sound. Second embodiment

[0081] In the following description, components that are the same as or equivalent to those in the above-described embodiment are denoted by the same reference numerals, and a description thereof is simplified or omitted.

[0082] In the embodiment described above, the slotted portion 40 is provided on at least a portion of the housing 2. Specifically, the passages 41 are formed in a portion of the front housing 21. The front housing 21 and the slotted portion 40 may be separate components.

[0083] Fig. 14 is a diagram schematically illustrating passages 41 according to the present embodiment. As shown in Fig. As shown in Figure 14, the slot portion 40 is provided on a slot member 40A that is attachable to and detachable from the base housing 20. The slot member 40A includes the passages 41. The slot member 40A is detachably fitted into an opening formed in the front housing 21. Third embodiment

[0084] Fig. 15 is a sectional view of the vicinity of a drive unit 30 according to the present embodiment. As shown in Fig. As shown in Figure 15, a slotted member 40C having passages 41 may be located in the flow path 16A of the base housing 20. Furthermore, a sound absorbing member 42C may be located in the flow path 16A. Fourth embodiment (not part of the invention)

[0085] In the embodiments described above, the sound-absorbing member 42 is provided in the backpack dust collector. The sound-absorbing member 42 may be provided in a dust collector that includes rollers.

[0086] Fig.16 is a perspective view of a dust collector 1G according to an embodiment not belonging to the invention, which is intended to serve as an explanatory example. The dust collector 1G includes one or more batteries, a casing 2G that houses a drive unit including a fan and a motor, and rollers 101 that movably support the casing 2G. The motor is driven by power supplied from the batteries. An outlet port 17 is formed in the casing 2G. In an interior of the casing 2G, a slit portion having slit-shaped passages is provided. The sound absorbing member 42 is located in at least a part of a flow path between the passages and the outlet port 17 in the interior of the casing 2G. Further embodiments

[0087] In the above-described embodiments, a plurality of constricted sections may be formed in the flow path 16. A baffle may be provided in at least a portion of the flow path 16. The sound absorbing member 42 may be located on the front surface 2A facing the back of the operator WM.

[0088] According to one aspect of the invention, generation of sound can be suppressed.

Claims

[1] Backpack dust collector (1) with a housing (2) comprising a suction connection (3); a dust collection chamber (13) connected to the suction port (3) and designed to accommodate a dust collection bag (18); a motor chamber (15) connected to the dust collection chamber (13) and housing a fan (31) and a motor (32); and an outlet port (17) through which air is discharged from the motor chamber (15); a slotted portion (40) located in a flow path (16) between the motor chamber (15) and the outlet port (17) and comprising at least one slotted passage (41) through which air passes from the motor chamber (15); and a sound absorbing component (42) located in at least part of a flow path (16B) between the passage (41) and the outlet port (17), wherein the housing (2) comprises a base housing (20) and a plate (23) connected to the base housing (20), and the flow path (16B) between the passage (41) and the outlet connection (17) is defined between the base housing (20) and the plate (23), characterized by , that the base housing (20) comprises a recessed portion (24) which is recessed towards the rear, the plate (23) is positioned so that it covers an opening of the recessed portion (24), the flow path (16B) is defined between an inner surface (24A) of the recessed portion (24) and a rear surface (23B) of the plate (23), and the sound absorbing member (42) is fixed to the inner surface (24A) of the recessed portion (24) and the rear surface (23B) of the plate (23). [2] Backpack dust collector (1) according to claim 1, wherein the sound absorbing member (42) points in the direction of the passage (41). [3] Backpack dust collector (1) according to claim 1, wherein the passage (41) is provided several times, and the sound absorbing component (42) points in the direction of each passage (41). [4] Backpack dust collector (1) according to claim 3, wherein a longitudinal direction of each passage (41) corresponds to a right-left direction of the backpack dust collector (1) and a width direction of each passage (41) corresponds to an up-down direction of the backpack dust collector (1), and the passages (41) are aligned in the top-bottom direction. [5] Backpack dust collector (1) according to one of claims 1 to 4, wherein a distance (D1) between the passage (41) and the sound absorbing member (42) is shorter than a distance (D2) between the passage (41) and the outlet port (17). [6] Backpack dust collector (1) according to claim 5, wherein the distance (D2) between the passage (41) and the outlet port (17) is at least twice longer than the distance (D1) between the passage (41) and the sound absorbing member (42). [7] Backpack dust collector (1) according to one of claims 1 to 6, wherein the passage (41) is formed in at least a part of the housing (2). [8] Backpack dust collector (1) according to claim 1, wherein the plate (23) points toward the back of the operator (WM) in a state where the housing (2) is worn on the back of an operator (WM). [9] Backpack dust collector (1) according to claim 1, wherein the passage (41) is located in the base housing (20), and the sound absorbing component (42) points in the direction of the passage (41). [10] Backpack dust collector (1) according to claim 1, wherein the flow path (16B) extends in an up-down direction of the backpack dust collector (1), and the outlet port (17) is defined by a lower end portion of the inner surface (24A) of the recessed portion (24) and a lower end portion of the rear surface (23B) of the plate (23). [11] Backpack dust collector (1) according to claim 1, wherein the slot portion (40) is provided on the base housing (20). [12] A backpack dust collector (1) according to claim 11, wherein, in a state where the casing (2) is worn on the back of an operator (WM), the plate (23) faces toward the back of the operator (WM), the passage (41) faces in a lateral direction, and the outlet port (17) faces downward. [13] Backpack dust collector (1) according to claim 1, wherein the slot portion (40) is provided on a slot member (40A) attachable to and detachable from the base case (20). [14] Backpack dust collector (1) according to one of claims 1 to 13, wherein the sound absorbing member (42) comprises a porous member. [15] Backpack dust collector (1) according to claim 14, wherein the sound absorbing member (42) comprises an open-cell porous member.

Images