JP5448737B2 - Blower - Google Patents

Description

The present invention relates to a blower in which a motor and a fan that rotates by driving the motor are provided in a main body.

For example, as shown in Patent Document 1, a dust collector includes a suction port to which a hose is connected and a discharge port to which a dust bag is connected to a main body in which a motor and a fan that rotates by driving of the motor are provided. Thus, by sucking outside air from the suction port through the hose and exhausting it to the discharge port, the dust sucked together with the outside air can be captured by the dust bag and collected.
Also, in this dust collector, in order to eliminate the discomfort due to static electricity stored in the housing and the dust bag, one end is close to the fan spindle and the other end is outside the discharge cylinder. A ground plate that is exposed to the conductive resin positive cylinder of the dust bag is provided, and (+) charges generated on the suction side and (-) charges generated on the discharge side are passed through the ground plate. I try to combine them.

JP 2001-50196 A

  However, in the above dust collector, the ground plate is kept close to the spindle on the suction side, so static electricity generated in the housing at the suction port and its surroundings does not disappear, and discharge occurs when the hose is removed from the suction port. There was a risk of it occurring.

Accordingly, an object of the present invention is to provide a blower that can more effectively prevent the occurrence of discharge due to static electricity and can maintain a good feeling of use.

In order to achieve the above object, a first aspect of the present invention is directed to a motor disposed in the front-rear direction, a fan fixed to the output shaft of the motor, a housing for housing the motor and the fan, and a radial direction of the fan. A blower having an exhaust port provided on the outer surface of the housing and a suction port provided on the surface of the housing and capable of moving air from the suction port to the discharge port by a fan. A grounding portion is provided at the outlet, and a connecting portion for connecting the motor and the grounding portion is provided. The connecting portion extends in parallel with the output shaft, and is connected to the first connecting portion. And a second connecting portion extending in the direction orthogonal to the output shaft .

According to the present invention, it is possible to more effectively prevent the occurrence of discharge due to static electricity and maintain a good feeling of use.

It is a perspective view of a dust collector. It is a front view of a dust collector. It is a perspective view of a main part, (A) shows the state seen from the back side, (B) seen from the front side. It is explanatory drawing of a main body, (A) shows a plane and (B) shows a front, respectively. It is explanatory drawing of a main body, (A) shows a back surface, (B) shows a bottom face, respectively. It is AA sectional view (a battery pack is abbreviate | omitted). It is a BB sectional view (a battery pack is omitted). It is CC sectional view taken on the line (a battery pack is abbreviate | omitted). It is a disassembled perspective view of a main body. It is a longitudinal cross-sectional view of a bag main body. It is sectional explanatory drawing of a main body. It is a front view of the main body which removed the fan housing. It is explanatory drawing of a motor, (A) is the perspective from the front side, (B) is the perspective from the back side, (C) shows a side surface, respectively. In the expanded sectional view of a fan part, (A) shows a steady state and (B) shows the state where the internal pressure of the scroll chamber rose, respectively. It is a front view of the dust collector of the example of a change which removed the front cover. Cross sections in the straight direction are shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Overall configuration of dust collector]
A dust collector 1 shown in FIGS. 1 and 2 has a rectangular box-shaped main body 2 that accommodates a motor and a fan therein, and a suction port 3 is formed on the front surface of the main body 2 and a discharge port 4 is formed on the upper right side. A hose 5 is attached to the suction port 3 and a dust bag 6 is detachably attached to the discharge port 4. A battery pack 7 serving as a power source is detachably mounted on a mounting portion 8 provided on the left side surface of the main body 2. That is, here, the dust bag 6 is arranged on the right side and the battery pack 7 is arranged symmetrically on the left side with the main body 2 as the center.
Further, as shown in FIGS. 3 to 5, a handle 9 is formed in the left-right direction at the center of the upper surface of the main body 2, while a flat stationary surface 2 a is formed on the bottom surface of the main body 2. The caps 10, 10,... Are fitted at the four corners of the stationary surface 2a.

[Detailed configuration of dust collector]
In the main body 2, as shown in FIGS. 6 to 8, the motor 11 is accommodated horizontally with the output shaft 12 facing the front, and the fan 14 is connected to the output shaft 12 via the extension shaft 13 by bolts 15. It is attached orthogonally. Here, the motor 11 is housed in a holding cylinder 17 erected forward on the rear inner surface of the motor housing 16 constituting the rear half of the main body 2, and the rear surface of the fan housing 18 assembled in front of the motor housing 16. The extension shaft 13 is pivotally supported by a ball bearing 19. A fan cover 20 as an inner housing is assembled in front of the fan housing 18 to form a scroll chamber 21 between the fan housing 18, and the extension shaft 13 penetrates the fan housing 18 to connect the fan 14. Arranged in the center of the scroll chamber 21. As shown also in FIG. 5, 22 is a recess that is recessed in the bottom surface of the main body 2 and exposes a part of the lower surface of the holding cylinder 17.

  As shown also in FIG. 9, the motor housing 16 and the fan housing 18 are combined with each other by a plurality of screws 23a, 23a,. A mounting portion 8 of the battery pack 7 and a half portion of the handle 9 are connected to the assembly surfaces of the housings 16 and 18 respectively. Further, a pair of protrusions 24, 24 are provided between the mounting portion 8 and the handle 9 so as to sandwich the assembly surfaces of the housings 16, 18, and a boss 25 provided on one protrusion 24 is screwed by a screw 23a. It is connected. A hook provided at the end of a suspension belt (not shown) can be locked to the boss 25. Similarly, on the right side surface of the main body 2, a pair of protrusions 26, 26 are erected with the assembly surfaces of the housings 16, 18 interposed therebetween, and a pin 27 is installed between the protrusions 26, 26. Also, the hook at the belt end can be locked.

The fan cover 20 is fixed to the fan housing 18 with screws 23b and 23b, and from the front, the fan cover 20 passes through the fan cover 20 and the fan housing 18 and is screwed into the motor housing 16 with long screws 23c, 23c. It is integrated.
The suction port 3 is integrally formed with the fan cover 20 coaxially with the output shaft 12 and the fan 14, and the discharge port 4 is a separate cylindrical body sandwiched between the assembly surfaces of the fan housing 18 and the fan cover 20. It is formed with. The discharge port 4 is coaxially connected to a lead-out portion 28 formed laterally in the tangential direction from the top of the scroll chamber 21. 29 and 29 are a pair of L-shaped grooves formed at the opening end of the discharge port 4. In addition, a sealing material 30 is sandwiched between the assembly surface of the fan housing 18 and the fan cover 20 from the entire circumference of the scroll chamber 21 to the opening of the discharge port 4.

  As shown in FIG. 10, the dust bag 6 is attached to the opening of the cloth bag main body 31 so that a pair of pins 33, 33 that are externally fitted to the discharge port 4 and penetrate the L-shaped groove 29 protrude to the inner surface. The cylinder 32 is connected, and the mounting cylinder 32 can be bayonet-coupled to the discharge port 4. At the upper part of the bag body 31, fasteners 34 are provided in a U-shape in plan view over three surfaces excluding the surface on the body 2 side, and the upper part can be arbitrarily opened and closed as a lid body 6a. Reference numeral 35 denotes a belt-like cover whose one end in the longitudinal direction is sewn along the lid body 6a. When the lid body 6a is closed by the fastener 34, the fastener 34 is covered with the cover 35 so as not to be exposed. Yes.

  In the fan cover 20, a plurality of ribs 36 to 38 are formed in the suction port 3. The ribs include a pair of upper ribs 36 and 36 projecting downward from the upper side in the opening surface of the suction port 3 and a pair of lower ribs 37 projecting upward from the lower side in the opening surface. , 37 and a pair of oblique ribs 38, 38 projecting in a diametrical direction passing through the center of the suction port 3 in a direction obliquely intersecting from the left and right sides of the upper and lower ribs 36, 37, Among them, the upper rib 36 and the lower rib 37 are provided so as to project close to each other in the vicinity of the center of the suction port 3 in the vertical direction, and are arranged in a staggered pattern alternately in the vertical direction. The oblique rib 38 protrudes with a shorter dimension than the upper and lower ribs 36 and 37. These ribs 36 to 38 are formed from the opening end to a position that is substantially half in the axial direction of the suction port 3, and the protruding end surface gradually decreases in the protruding amount toward the opening of the suction port 3. It is inclined.

  A front cover 39 as an outer housing is mounted in front of the fan cover 20. The front cover 39 is fixed to the fan cover 20 with screws 23d, 23d,... From the front, covers the front surface of the fan cover 20 including the scroll chamber 21 and the lead-out portion 28. A connecting cylinder 40 is provided that is coaxially arranged on the outside. As shown in FIG. 11, the connecting tube 40 is long enough to cover the end 5 a of the hose 5 fitted to the suction port 3 from the outside and protrudes forward from the suction port 3. The pair of protrusions 41, 41 that engage with the pair of protrusions 5b provided on the end portion 5a are protruded at point-symmetrical positions. That is, the end 5a is externally mounted on the suction port 3 with the protrusions 5b, 5b out of phase with the protrusions 41, 41, and the connection cylinder 40 until the flange 5c provided on the outer periphery of the end 5a abuts the connection cylinder 40. If the projections 5b and 5b are rotated until they are in phase with the protrusions 41 and 41, the end 5a of the hose 5 is connected to the connection tube 40 in a state of being prevented from coming off, and the suction port 3 is inserted. It is connected with.

  Further, on the inner surface of the front cover 39, as shown in FIG. 9, a metal first ground plate 43 that electrically connects the opening of the connection tube 40 and the protruding end portion 42 covering the front surface of the lead-out portion 28. A second earth plate 44 is provided. The first ground plate 43 is formed in an L-shape, and one end side protrudes forward along the inner surface of the connection tube 40, and the front end portion 45 bent in a hook shape is locked to the opening of the connection tube 40. . The other end projects in the upper right direction along the inner surface of the front cover 39. On the other hand, the second ground plate 44 is formed in a T-shape composed of a horizontal bar portion 46 in the left-right direction and a vertical bar portion 47 in the vertical direction, and the left end of the horizontal bar portion 46 contacts the right end of the first ground plate 43. On the other hand, the right end portion 48 bent in a hook shape is engaged with the protruding end portion 42 of the front cover 39.

49 is a metal ground pin that penetrates the fan cover 20 and the fan housing 18 in the front-rear direction at a tongue portion 21a (FIG. 7) that contacts the root of the lead-out portion 28 outside the scroll chamber 21, and the front end of the second ground plate 44 is at the front end. While contacting the lower end of the vertical bar portion 47, the rear end is positioned in contact with the front surface of a screw boss 50 protruding from the rear surface of the motor housing 16, and is used as an electrical component by a ground wire (not shown). The motor 11 is electrically connected. The ground wire and the ground pin 49 serve as a grounding means.
Here, the end portion 5a of the hose 5 serving as the connection portion and the mounting tube 32 of the dust bag 6 are formed of a conductive resin such as carbon-filled polypropylene, for example, and when the hose 5 is connected to the connection tube 40, the end When the portion 5 a contacts the front end 45 of the first ground plate 43 and the dust bag 6 is connected to the discharge port 4, the mounting cylinder 32 contacts the right end 48 of the second ground plate 44.

On the other hand, the mounting portion 8 of the battery pack 7 has a pair of terminal plates 52, 52 protruding in parallel in the vertical direction in a ridge 51 erected in a U-shape on the left side surface of the main body 2. 11, when the fitting portion 7a provided on the upper surface of the fitting 7 is fitted into the ridge 51 from above and is slid downward until the stopper 7b provided on the fitting portion 7a contacts the upper end of the ridge 51. 12, the fitting portion 7 a is coupled to the protrusion 51, and the terminals 7 c and 7 c are electrically connected to the terminal plates 52 and 52. In this mounted state, the center of gravity of the battery pack 7 is located below the center of gravity of the main body 2. To remove the battery pack 7, the fitting portion 7a is slid upward from the protrusion 51.
Reference numeral 53 denotes a switch unit provided at the left end of the handle 9, and is provided with a switch plate 54 on the upper surface of the handle 9 so as to expose the ON / OFF operation unit. The switch unit 53 is electrically connected to the controller 55 in the main body 2 together with the terminal plate 52 of the mounting portion 8.

  As shown in FIG. 13, the motor 11 includes a cooling fan 61 in the casing 60 near the rear of the output shaft 12, and is a middle window that is a long hole in the circumferential direction formed in the casing 60. The cooling fan 61 is exposed to the outside from 62, 62,. .. Are formed on the front surface of the casing 60 in the circumferential direction, and terminals 64, 64 project from the rear surface of the casing 60 and are elongated in the circumferential direction. Rear windows 65, 65,... Are formed.

  Further, rubber covers 66 and 67 are attached to the casing 60 from the front and rear. Among these, the front rubber cover 66 covers the front side of the middle window 62, and the front center portion projects forward of the casing 60 to form a holding ring 68 that holds the ball bearing 19. As shown in FIG. 14A, the holding ring 68 is fitted into a ring-shaped inner holding wall 18a projecting from the rear surface of the fan housing 18, and the front surface of the holding ring 68 and the fan housing 18 are fitted. A communication portion 18b including a through hole through which the extension shaft 13 and the fan 14 pass is formed between the rear surface and the rear surface. Reference numeral 18c denotes a ring-shaped outer holding wall that protrudes from the rear surface of the fan housing 18 outside the inner holding wall 18a and is fitted with the front end of the holding cylinder 17. The outer holding wall 18c and the holding cylinder 17 serve as a motor. A motor chamber 17 a that houses the motor 11 is formed in the housing 16.

Further, a ring-shaped groove 69 is coaxially recessed in the front surface of the holding ring 68 to form a thin seal portion 70 on the outer periphery of the front end. The outer peripheral surface of the holding ring 68 including the seal portion 70 is close to the inner peripheral surface of the inner holding wall 18a, and allows the motor chamber 17a and the scroll chamber 21 to communicate with each other.
In addition, a front flange 71 whose outer peripheral surface is in contact with the inner surface of the holding cylinder 17 is provided in the vicinity of the front end of the casing 60 in the rubber cover 66, and on the outer peripheral surface of the rubber cover 66 behind the front flange 71, A plurality of axial protrusions 72, 72... Having the same height as the front flange 71 are provided in the circumferential direction of the rubber cover 66. 73 is an opening provided in front of the front flange 71 in the holding ring 68 to allow the front window 63 to communicate with the outside.

On the other hand, the rubber cover 67 on the rear side has a sleeve shape that covers the rear side of the middle window 62 except for the terminal 64 and the rear window 65 of the casing 60, and the rear end of the rubber cover 67 contacts the inner surface of the holding cylinder 17 at the front end. A flange 74 is provided around the rear surface of the rubber cover 67 at the rear side of the rear flange 74, and axial ridges 75, 75... Which are the same height as the rear flange 74 are in phase with the ridge 72. Are projecting.
Therefore, the motor chamber 17a communicates with the middle space 76 that communicates with the middle window 62, the front space 77 that communicates with the front window 63, and the rear window 65 by the front and rear flanges 71 and 74 provided on the rubber covers 66 and 67. The rear spaces 78 are formed as partitions.

  In the motor housing 16, an air outlet 81 that opens into the recess 22 is formed in the lower portion of the holding cylinder 17, while the output shaft 12 is disposed on the rear side of the motor 11, as shown in FIG. And a plurality of air inlets 83, 83,... Are formed adjacent to the periphery of the circular protrusion 82 and open in an oval shape. Therefore, the middle space 76 in the motor chamber 17 a communicates with the outside of the main body 2 through the air outlet 81, and the rear space 78 communicates with the outside of the main body 2 through the intake port 83. .. Are formed on the lower side of the front end of the holding cylinder 17 so that the front space 77 communicates with the recess 22 as shown in FIG.

[Operation of dust collector]
As shown in FIG. 1, the dust collector 1 configured as described above is attached to the floor or the like with the hose 5 attached to the suction port 3, the dust bag 6 attached to the discharge port 4, and the battery pack 7 attached to the attachment portion 8. When the switch plate 54 is turned on and the switch plate 54 is turned on, the motor 11 is driven to rotate the fan 14 together with the output shaft 12. Therefore, outside air is sucked from the hose 5 through the suction port 3, circulates inside the scroll chamber 21, and is discharged from the discharge port 4 through the lead-out portion 28. When the hose 5 is connected to an electric tool or the like and dust is sucked together with the outside air, it is discharged from the discharge port 4 and captured by the dust bag 6 and collected.
On the other hand, if the hose 5 is removed from the suction port 3 and a nozzle (not shown) is connected to the discharge port 4, it can be used as a blower. In this case, the handle 9 can be gripped, or the belt can be locked to the boss 25 and the pin 27 and carried on the shoulder. The use as a blower is not limited to being carried. For example, if a hose is connected to the discharge port 4, even if the main body 2 is placed on the ground or the like, air can be blown in any direction by operating only the hose.

Here, in the main body 2, when the motor 11 is driven to rotate the cooling fan 61, first, outside air is first sucked into the motor chamber 17 a from the air inlet 83 on the rear side of the motor 11, and the casing 60 from the rear window 65. Then, it moves forward in the casing 60, is discharged from the middle window 62 into the middle space 76, and is discharged from the outlet 81 to the recess 22, that is, outside the main body 2.
In addition, on the front side of the motor 11, the air sucked from the recess 22 through the notch 79 is guided into the casing 60 from the front window 63 through the front space 77 and the opening 73, and moves backward in the casing 60. Then, the air is discharged from the middle window 62 into the space 76, and exhausted from the air outlet 81 to the recess 22. The motor 11 is cooled by these ventilation paths.

  At this time, the middle space 76 from which the motor-cooled air is discharged is partitioned by the front and rear flanges 71 and 74 and the front and rear spaces 77 and 78 into which the air before cooling is sucked, so that the motor cooling is performed in the motor chamber 17a. The latter air is not sucked into the casing 60 again and circulated. Therefore, the motor 11 can be cooled with fresh air.

  On the other hand, when dust accumulates in the dust bag 6 and the exhaust resistance increases, the pressure in the scroll chamber 21 increases, and the pressure also increases in the communication portion 18 b communicating with the scroll chamber 21. Then, as shown in FIG. 14B, the holding ring 68 is pushed from the front and expands in the radial direction, and the seal portion 70 is pushed against the inner peripheral surface of the inner holding wall 18a, so that the communication portion 18b is sealed. The Therefore, even if dust stays in the scroll chamber 21, it becomes difficult to enter the front space 77 in the motor chamber 17 a, and the dustproof property of the motor 11 is maintained.

Also, since the suction port 3 is provided with ribs 36 to 38, the filter function is exhibited and large pieces of wood and dust are blocked here, and are not sucked into the scroll chamber 21.
Furthermore, if the dust sucked from the suction port 3 during dust collection is a material that is easily charged to (−) such as wood chips, static electricity that is charged to (−) due to friction with the end 5a and the suction port 3. And the opposite end 5a and suction port 3 are charged to (+). Thereafter, when the charged dust passes through the scroll chamber 21 and is discharged from the discharge port 4, the (−) charge is dropped to the discharge port 4 or the mounting tube 32 by contacting the discharge port 4 or the mounting tube 32. . Here, since the end 5a of the hose 5 and the mounting cylinder 32 are electrically connected by the first and second ground plates 43 and 44, the (+) charge on the suction side and the (-) charge on the discharge side Are connected via the first and second ground plates 43 and 44 and disappear. Similarly, even if the fan 14 is charged to (+) due to friction with dust, it is combined with the (−) charge dropped from the ground pin 49 to the motor 11 and disappears.

[Effect of dust collector]
Thus, according to the dust collector 1 of the said form, each end part 5a and the dust bag 6 are connected in the main body 2 between the suction port 3 side and the discharge port 4 side. First and second ground plates 43 and 44 that contact the mounting cylinder 32 and electrically connect them are installed, and the first and second ground plates 43 and 44 are electrically connected to the motor 11 in the main body 2. By providing the earth pin 49 and the lead wire, static electricity generated on the suction port 3 side and static electricity generated on the discharge port 4 side can be suitably eliminated. Therefore, it is possible to more effectively prevent the occurrence of discharge due to static electricity and maintain a good feeling of use.

In particular, the first and second ground plates 43 and 44 are disposed outside the scroll chamber 21 that houses the fan 14 and communicates with the suction port 3 and the discharge port 4. 44 prevents the flow of air or dust in the scroll chamber 21 from being obstructed or causing turbulence. Therefore, even if the first and second ground plates 43 and 44 are provided, there is no possibility of affecting the dust collection performance.
Further, the front surface of the main body 2 has a double structure of a fan cover 20 in which the scroll chamber 21 is provided and a front cover 39 that covers the outer surface of the fan cover 20, and the first and second ground plates 43 and 44 are provided as fan fans. By arranging the cover 20 between the cover 20 and the front cover 39, the first and second ground plates 43 and 44 can be easily disposed at appropriate positions, and can be easily replaced by removing the front cover 39.

[Dust collector change example]
The dust collector is not limited to the above-mentioned form, for example, the discharge port and the mounting part are provided in the left and right direction so that the arrangement of the dust bag and the battery pack is reversed, the mounting of the battery pack is the sliding coupling from the front or the rear, or the sliding coupling Instead, it is possible to change the design as appropriate, such as a plug-in connection for inserting the battery pack or changing the direction of the handle.

In particular, the conductive member is not limited to using two ground plates as in the above embodiment, but may be three or more, or conversely, may be a single ground plate. FIG. 15 shows an example in which one earth plate is provided. In this dust collector 1a, the L-shaped earth plate 56 has a straight portion 57 excluding the front and rear portions protruding into the connecting tube 40, and the tongue portion 21a. Is arranged so as to connect the suction port 3 side and the discharge port 4 in a straight line across the front of the wire, and a ground pin 49 that protrudes forward through the tongue 21a is inserted and connected to an intermediate portion of the straight portion 57 It has become a form.
According to this modified example, the suction port 3 side and the discharge port 4 side can be electrically connected by the single ground plate 56, and in addition to obtaining the same antistatic effect as that of the above embodiment, the configuration is simplified. There is also an advantage that leads to cost reduction.

  In addition, the conductive member is not limited to the plate, and it is possible to change the design such as connecting the conductive plates with lead wires only using the conductive plate at the contact portion between the end portion of the hose and the mounting cylinder of the dust bag, Also in the grounding means, the ground pin can be omitted and the lead wire can be directly connected to the conductive member. As the electrical component, other components other than the motor may be used.

  1, 1a ... Dust collector 2. Main unit 2a ... Stationary surface 3 .... Suction port 4 .... Discharge port 5 .... Hose, 6 .... Dust bag, 7 .... Battery pack, ... Mounting part, 9 ... Handle, 11 ... Motor, 12 ... Output shaft, 14 ... Fan, 16 ... Motor housing, 17 ... Holding cylinder, 17a ... Motor chamber, 18 ... Fan housing, 18a ... · Communication part, 19 · · Ball bearing, 20 · · Fan cover, 21 · · Scroll chamber, 21a · · tongue, 22 · · recess, 23a ~ 23d · · screw, 25 · · boss, 27 · · pin, 28 .. Lead-out part, 31 .. Bag body, 34 .. Fastener, 35 .. Cover, 36 .. Upper rib, 37 .. Lower rib, 38 .. Diagonal rib, 39 .. Front cover, 40. Cylinder, 43 ··· First earth plate, 44 · 2nd earth plate, 49 ... ground pin, 51 ... projection, 56 ... earth plate, 57 ... extension part, 60 ... casing, 61 ... cooling fan, 62 ... middle window, 63 ... Front window, 65 ·· Rear window, 66, 67 ·· Rubber cover, 68 ·· Retaining ring, 70 ·· Seal part, 71 ·· Front flange, 74 ·· Rear flange, 76 ·· Medium space, 77 ·· Front space, 78 ... Rear space, 81 ... Air outlet, 82 ... Circular projection, 83 ... Air inlet.

Claims (1)

A motor arranged in the front-rear direction ;
A fan fixed to the output shaft of the motor;
A housing for housing the motor and the fan;
A discharge port provided on a surface of the housing on a radially outer side of the fan;
A suction port provided on the surface of the housing,
A blower capable of moving air from the suction port to the discharge port by the fan,
While providing a grounding part at the outlet,
Providing a connecting portion for connecting the motor and the ground portion;
The connection portion includes a first connection portion that extends in parallel with the output shaft and is grounded to the motor, and a second connection portion that is connected to the first connection portion and extends in a direction orthogonal to the output shaft. Blower characterized by.

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