blower

Abstract

This invention provides a blower, and a technique that prevents the user's hand from reaching the fan while suppressing any degradation in the blower's usability. The blower may include: a fan; a prime mover that drives the fan; a housing that houses the fan and the prime mover; a ventilation path extending from the fan; and a top opening formed at the top of the ventilation path, connecting the interior and exterior of the ventilation path. When the fan is driven, air may be expelled from the interior to the exterior of the ventilation path via the top opening, or air may be drawn in from the exterior to the interior of the ventilation path via the top opening. There may be no obstructions within the ventilation path between the top opening and the fan. The diameter of the largest inscribed circle of the top opening may be 50 mm or less.

Description

Technical Field

[0001] The technology disclosed in this specification relates to blowers. Background Technology

[0002] Patent Document 1 discloses a blower comprising: a fan; a prime mover that drives the fan; a housing that houses the fan and the prime mover; a ventilation path extending from the fan; and a top opening formed at the top of the ventilation path, communicating between the interior and exterior of the ventilation path. When the fan is driven, air is either expelled from the interior to the exterior of the ventilation path via the top opening, or air is drawn from the exterior to the interior of the ventilation path via the top opening. Inside the ventilation path, there are no obstructions between the top opening and the fan.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-159924 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] When the ventilation path and the top opening are both wide, there is a possibility that a user's hand may enter the interior of the ventilation path through the top opening and subsequently reach the fan. To prevent this, sometimes a barrier is installed inside the ventilation path. However, when a barrier is installed inside the ventilation path, there is a possibility that an object (such as dust) may become caught on the barrier inside the ventilation path and remain inside. In this case, it becomes inconvenient to remove the object from inside the ventilation path, thus potentially reducing the ease of use of the blower. This specification provides a technique that can prevent the user's hand from reaching the fan while suppressing the reduction in the ease of use of the blower.

[0008] Solution for solving the problem

[0009] The blower disclosed in this specification may include: a fan; a prime mover that drives the fan; a housing that houses the fan and the prime mover; a ventilation path extending from the fan; and a top opening formed at the top of the ventilation path, allowing communication between the interior and exterior of the ventilation path. When the fan is driven, air may be expelled from the interior to the exterior of the ventilation path via the top opening, or air may be drawn from the exterior to the interior of the ventilation path via the top opening. There may be no obstructions within the ventilation path between the top opening and the fan. The diameter of the largest inscribed circle of the top opening may be 50 mm or less.

[0010] According to the above structure, the top opening is narrow enough that a user's palm (or arm) cannot pass through. This prevents the user's palm (or arm) from entering the ventilation path through the top opening, thus preventing the user's hand from reaching the fan. Furthermore, since there are no obstructions between the top opening and the fan inside the ventilation path, objects (such as dust) are prevented from remaining inside the ventilation path. This prevents the inconvenience of removing objects from inside the ventilation path, thus preventing a decrease in the ease of use of the blower. Therefore, according to the above structure, both a decrease in the ease of use of the blower and a prevention of the user's hand reaching the fan can be achieved.

[0011] Another blower disclosed in this specification may include: a fan; a prime mover that drives the fan; a housing that houses the fan and the prime mover; a ventilation path extending from the fan; and a top opening formed at the top of the ventilation path, allowing the interior of the ventilation path to communicate with the exterior. When the fan is driven, air may be expelled from the interior of the ventilation path to the exterior via the top opening, or air may be drawn from the exterior of the ventilation path to the interior via the top opening. There may be no obstructions within the ventilation path between the top opening and the fan. The diameter of the largest inscribed circle of the cross-section of at least one portion of the ventilation path may be 50 mm or less.

[0012] According to the above structure, at least one part of the ventilation path is narrow enough that a user's palm (or arm) cannot pass through. This prevents the user's hand from reaching the fan. Furthermore, since there are no obstructions inside the ventilation path from the top opening to the fan, objects (such as dust) are prevented from remaining inside the ventilation path. This prevents the inconvenience of removing objects from inside the ventilation path, thus reducing the deterioration of the blower's usability. Therefore, according to the above structure, the user's hand can be prevented from reaching the fan while simultaneously reducing the deterioration of the blower's usability.

[0013] In addition, the term "obstruction" as used in this specification refers to an object that prevents an object from passing through the ventilation path (e.g., a filter, mesh, baffle). Attached Figure Description

[0014] Figure 1 This is a diagram showing the blower 2 of Example 1 viewed from the upper left front.

[0015] Figure 2 This is a cross-sectional view of the internal structure of the blower 2 in Embodiment 1 as viewed from the left.

[0016] Figure 3 This is a cross-sectional view of the internal structure of the blower 2 in Embodiment 1 as viewed from the left.

[0017] Figure 4 This is a diagram showing the centrifugal fan 26 of the blower 2 in Embodiment 1 viewed from the upper left front.

[0018] Figure 5 This is a cross-sectional view of the air intake path 72 and air delivery path 76 of the blower 2 in Embodiment 1, viewed from the left.

[0019] Figure 6 This is a diagram showing the blower 2 of Example 1 viewed from the front.

[0020] Figure 7 This is a diagram showing the first top opening 70 and the second top opening 74 of the blower 2 in Embodiment 1 viewed from the front.

[0021] Figure 8 This is a diagram showing the air delivery pattern of the blower 102 in Example 2 from the upper left front.

[0022] Figure 9 This is a diagram showing the suction configuration of the blower 102 in Example 2 from the upper left front.

[0023] Figure 10 This is a cross-sectional view of the internal structure of the handle 120 and motor housing 122 of the blower 102 in Embodiment 2, viewed from the right.

[0024] Figure 11 This is a cross-sectional view of the internal structure of the motor housing 122 and fan housing 124 of the blower 102 in Embodiment 2, viewed from the front.

[0025] Figure 12 This is a cross-sectional view of the air delivery path 152 of the blower 102 in Embodiment 2, viewed from the left.

[0026] Figure 13 This is a view of the third top opening 150 of the blower 102 in Embodiment 2 from the front.

[0027] Figure 14 This is a cross-sectional view of the air intake path 156 of the blower 102 in Embodiment 2 as viewed from the rear. Detailed Implementation

[0028] Hereinafter, representative and non-limiting examples of the present invention will be described in detail with reference to the accompanying drawings. This detailed description is merely intended to present to those skilled in the art the details of preferred embodiments for carrying out the invention, and is not intended to limit the scope of the invention. Furthermore, in order to provide a further improved blower, the disclosed additional features and technical solutions can be used separately or in combination with other features and technical solutions.

[0029] Furthermore, the features and combinations of processes disclosed in the following detailed description are not essential for carrying out the invention in the broadest sense, but are described only to illustrate representative specific examples of the invention. Moreover, when providing additional and useful embodiments of the invention, the various features of the following representative specific examples and the various features of the technical solutions described in the claims are not necessarily combined as in the specific examples described herein or in the order listed.

[0030] All features recited in this specification and / or claims are intended to be disclosed separately and independently of the structure of the features recited in the embodiments and / or claims, as a disclosure of the original application and as a limitation of the specific matters recited in the claims. Furthermore, all numerical ranges and descriptions relating to groups or sets are intended to disclose their intermediate structures as a disclosure of the original application and as a limitation of the specific matters recited in the claims.

[0031] In one or more embodiments, the diameter of the largest inscribed circle may be 20 mm or more.

[0032] When the top opening and / or ventilation path is too narrow, the pressure loss generated in the top opening and / or ventilation path when air flows through it is significant, potentially reducing the blower's output airflow or the blower's suction airflow. According to the above structure, the narrowness of the top opening and / or ventilation path can be prevented, thus reducing the pressure loss generated in the top opening and / or ventilation path when air flows through it. This, in turn, increases the blower's output airflow or the blower's suction airflow. Furthermore, according to the above structure, the top opening and / or ventilation path is moderately wide, thus preventing objects to be sucked in (e.g., fallen leaves) from getting caught in the top opening and / or ventilation path when using a blower to perform air suction. This allows for smooth suction of the object using the blower.

[0033] In one or more embodiments, the length of the internal flow path from the top opening to the fan may be less than 850 mm.

[0034] Based on the above structure, the ventilation path is relatively compact, so users can easily move and operate the blower.

[0035] In one or more embodiments, the fan can be visually identified via the top opening when viewed from the outside of the ventilation path along its extension direction.

[0036] Based on the above structure, the airflow path from the top opening to the fan becomes straight, resulting in lower flow resistance. This allows for an increase in the blower's output airflow or its suction airflow.

[0037] In one or more embodiments, when the fan is driven, air is drawn from the outside to the inside of the ventilation path through the top opening.

[0038] According to the above structure, when air is drawn in using a blower, objects (such as dust) are actively drawn into the interior of the ventilation path. In this case, the effect of having no obstructions between the top opening and the fan inside the ventilation path can be significantly utilized (i.e., preventing objects from remaining inside the ventilation path).

[0039] In one or more embodiments, the fan may be a centrifugal fan.

[0040] Centrifugal fans, for example, are better suited to generating high-pressure airflow compared to axial fans. Therefore, based on the above structure, it is easy to realize a blower that generates high-pressure airflow, i.e., a blower with high suction force.

[0041] In one or more embodiments, the blower may further include a collection bag detachably mounted to the housing in a space disposed outside the housing, for collecting suction material drawn in along with air from the outside to the inside of the ventilation path via the top opening. Alternatively, when the direction of drawing air in from the outside to the inside of the ventilation path via the top opening is designated as a first direction, and the opposite direction is designated as a second direction, the end of the top opening in the second direction is offset in the second direction compared to the end of the collection bag mounted to the housing in the second direction.

[0042] When air is drawn in using a blower, the collection bag and air are sometimes sucked together towards the top opening, causing the collection bag to shake. When the collection bag shakes, the user may find it obstructive. According to the above structure, when air is drawn in using a blower, the suction of the collection bag and air towards the top opening can be prevented. This suppresses the shaking of the collection bag, thus preventing the user from finding it obstructive. Furthermore, according to the above structure, the blower is more compact, allowing the user to easily move and operate it.

[0043] (Example 1: Blower 2)

[0044] like Figure 1 As shown, the blower 2 includes a housing 4, a nozzle 6, a handle 8, a trigger lever 10, a cruise control lever 12, a switching lever 14, a pair of wheels 16, a connecting component 18, a collection bag 20, and an electric motor 22 (see reference). Figure 2 ), control device 24 (refer to) Figure 2 ) and centrifugal fan 26 (refer to Figure 2 A battery pack B is detachably mounted on the lower rear part of the housing 4. The battery pack B contains a rechargeable secondary battery unit (e.g., a lithium-ion battery unit). The blower 2 operates using power supplied from the battery pack B. In this embodiment, the direction along the length of the nozzle 6, from the housing 4 toward the nozzle 6, is defined as forward, and the opposite direction is defined as rearward. Furthermore, the direction perpendicular to the forward / backward direction, from the housing 4 toward the collection bag 20, is defined as downward, and the opposite direction is defined as upward. Additionally, the direction perpendicular to both the forward / backward and up / down directions, from the housing 4 toward the switching lever 14, is defined as left, and the opposite direction is defined as right.

[0045] The handle 8 has a base 28, a front grip 30, and a rear grip 32. The base 28 protrudes rearward and upward from the upper surface of the housing 4. The front grip 30 extends forward and upward from the front surface of the base 28, then branches and extends to the right and left. The rear grip 32 extends rearward and downward from the rear surface of the base 28, then bends and extends forward, connecting to the rear surface of the housing 4. The user can move the blower 2 by holding the front grip 30 with one hand and the rear grip 32 with the other hand.

[0046] A pair of wheels 16 are rotatably mounted on the lower part of the front end of the nozzle 6 (specifically, the air delivery nozzle 68). By driving the pair of wheels 16 on the ground with one hand holding the front handle 30 and the other hand holding the rear handle 32, the user can easily move the front end of the nozzle 6 along the ground.

[0047] The connecting member 18 includes a connecting part 34, a rod part 36, and a handle part 38. The connecting part 34 is detachably mounted to the lower end of the housing 4. The rod part 36 is located at the rear end of the connecting part 34. The handle part 38 extends rearward from the rear end of the connecting part 34. The user can detach the connecting member 18 from the housing 4 by pressing the rod part 36 downward with the other hand while holding the handle part 38 with one hand. Additionally, a collection bag 20 is mounted to the connecting part 34. The collection bag 20 is made of a mesh material. This allows air inside the collection bag 20 to pass through it. The collection bag 20 collects the waste sucked up by the blower 2.

[0048] like Figure 2 As shown, the housing 4 includes an intake chamber 40, a fan housing 42, an exhaust chamber 44, and a motor housing 46. The intake chamber 40 is connected to the front of the fan housing 42. The exhaust chamber 44 is connected to the lower part of the fan housing 42. The motor housing 46 is connected to the rear of the fan housing 42.

[0049] An electric motor 22 and a control device 24 are housed in a motor housing 46. A centrifugal fan 26 is housed in a fan housing 42. In the motor housing 46, the control device 24 is positioned behind the electric motor 22. The control device 24 supplies power to the electric motor 22 using power supplied from the battery pack B. The control device 24 controls the output of the electric motor 22 by adjusting the power supplied to it. The electric motor 22 is, for example, a brushless motor. The electric motor 22 rotates a shaft 48. The shaft 48 spans the fan housing 42 and the motor housing 46. The shaft 48 is connected to the centrifugal fan 26.

[0050] The trigger lever 10 is located at the front of the lower surface of the rear grip 32. The user can operate the trigger lever 10 with the index finger of the hand holding the rear grip 32. When the user presses the trigger lever 10 in, power is supplied from the battery pack B to the electric motor 22, which is driven, causing the centrifugal fan 26 to rotate. This allows the blower 2 to perform air suction or air delivery. At this time, the output of the electric motor 22 (i.e., the rotational speed of the centrifugal fan 26) is adjusted according to the amount the trigger lever 10 is pressed. When the user removes their hand from the trigger lever 10 and it is no longer pressed, the power supply from the battery pack B to the electric motor 22 is cut off, and the air suction or air delivery performed by the blower 2 stops. Additionally, the cruise control lever 12 is located near the connection between the base 28 and the rear grip 32. By moving and fixing the cruise control lever 12 to the desired position, the user can maintain the trigger lever 10 in a state where it is pressed in to the desired amount. Therefore, even when the user removes their hand from the trigger lever 10, the trigger lever 10 can still be kept in the depressed state.

[0051] like Figure 2 , Figure 3As shown, a partition plate 50 is provided in the exhaust chamber 44, which is rotatable relative to the housing 4 about an axis extending in the left-right direction. The partition plate 50 divides the exhaust chamber 44 into a first exhaust chamber 52 extending downward when viewed from the fan housing 42 and a second exhaust chamber 54 extending forward when viewed from the fan housing 42. Furthermore, the partition plate 50 and the switching lever 14 (see reference) disposed on the outer surface of the housing 4... Figure 1 (Linkage). The user can operate the switching lever 14 to adjust the position of the separator 50. Figure 2 The collection location shown is the same as Figure 3 Move between the non-collection locations shown. For example... Figure 2 As shown, when the separator 50 is in the collection position, the internal space of the first exhaust chamber 52 is connected to the internal space of the fan housing chamber 42, while the internal space of the second exhaust chamber 54 is not connected to the internal space of the fan housing chamber 42. Figure 3 As shown, when the partition 50 is in the non-collection position, the internal space of the first exhaust chamber 52 is not connected to the internal space of the fan housing chamber 42, while the internal space of the second exhaust chamber 54 is connected to the internal space of the fan housing chamber 42. Therefore, the partition 50 is in a state where the internal space of the fan housing chamber 42 is connected to the internal space of the first exhaust chamber 52 (i.e., Figure 2 The state shown) and the state in which the internal space of the fan housing 42 is connected to the internal space of the second exhaust chamber 54 (i.e., Figure 3 Selectively switch between the states shown.

[0052] like Figure 4 As shown, the centrifugal fan 26 includes a shaft portion 56, a circular plate portion 58, a front blade portion 60, and a rear blade portion 62. The circular plate portion 58 extends radially outward from the outer peripheral surface of the shaft portion 56. The front blade portion 60 protrudes forward from the front surface of the circular plate portion 58. The rear blade portion 62 protrudes rearward from the rear surface of the circular plate portion 58. The shaft portion 56 is fixed to the front part of the shaft 48. Therefore, the centrifugal fan 26 rotates integrally with the shaft 48. The front blade portion 60 of the centrifugal fan 26, by rotating, draws in air located in front of the centrifugal fan 26 and delivers the air radially outward from the centrifugal fan 26. Similarly, the rear blade portion 62 of the centrifugal fan 26, by rotating, draws in air located behind the centrifugal fan 26 and delivers the air radially outward from the centrifugal fan 26. In addition, a crushing cutter 64 is fixed to the front end of the shaft portion 56. The crushing cutter 64 rotates integrally with the shaft 48. The crushing cutter 64 is made of a metal material (e.g., an iron alloy). The crushing blade 64 crushes the waste by rotating.

[0053] like Figure 5As shown, nozzle 6 is mounted on the front of housing 4. Nozzle 6 is retractable in the longitudinal direction (i.e., the front-to-back direction). The user can change the length of nozzle 6 by retracting or extending it. Nozzle 6 includes an intake nozzle 66 and an exhaust nozzle 68. Intake nozzle 66 is positioned above exhaust nozzle 68. A first top opening 70 is formed at the top of intake nozzle 66, communicating between the internal space of intake nozzle 66 and the external space of blower 2. The internal space of intake nozzle 66 communicates with the internal space of intake chamber 40. In this embodiment, the passage from the first top opening 70 through intake nozzle 66 and intake chamber 40 to fan housing 42 is called "intake path 72". Intake path 72 extends in the front-to-back direction. In addition, a second top opening 74 is formed at the top of exhaust nozzle 68, communicating between the internal space of exhaust nozzle 68 and the external space of blower 2. The internal space of exhaust nozzle 68 communicates with the internal space of second exhaust chamber 54. In this embodiment, the passage from the fan housing 42 through the second exhaust chamber 54 and the air supply nozzle 68 to the second top opening 74 is called the "air supply path 76". The air supply path 76 extends in the front-to-back direction.

[0054] Air drawn from the outside of the suction path 72 through the first top opening 70 flows rearward. If the front end of the first top opening 70 is offset rearward compared to the front end of the collection bag 20, there is a possibility that the collection bag 20 and air may be drawn towards the first top opening 70 together, causing the collection bag 20 to shake. In contrast, in this embodiment, the front end of the first top opening 70 is offset forward compared to the front end of the collection bag 20. Therefore, when air is drawn through the first top opening 70, it is possible to prevent the collection bag 20 and air from being drawn towards the first top opening 70 together, thereby suppressing shaking of the collection bag 20.

[0055] Air delivered from inside the air supply path 76 through the second top opening 74 flows forward. If the front end of the second top opening 74 is offset rearward compared to the front end of the collection bag 20, there is a possibility that the air delivered through the second top opening 74 might hit the collection bag 20, causing the collection bag 20 to shake. In contrast, in this embodiment, the front end of the second top opening 74 is offset forward compared to the front end of the collection bag 20. Therefore, when air is delivered through the second top opening 74, it is possible to prevent the air delivered through the second top opening 74 from hitting the collection bag 20, thereby suppressing shaking of the collection bag 20.

[0056] Inside the intake path 72, there are no obstructions between the first top opening 70 and the centrifugal fan 26. In addition, the shortest flow path length from the first top opening 70 to the centrifugal fan 26 when the nozzle 6 is extended to its longest state, i.e., the first flow path length L1, is in the range of 50 mm or more and 850 mm or less, for example, 470 mm.

[0057] Inside the air delivery path 76, there are no obstructions between the second top opening 74 and the centrifugal fan 26. In addition, the shortest flow path length from the second top opening 74 to the centrifugal fan 26 when the nozzle 6 is extended to its longest state, i.e., the second flow path length L2, is in the range of 50 mm or more and 850 mm or less, for example, 470 mm.

[0058] like Figure 6 As shown, the first top opening 70 has a generally elliptical shape. Correspondingly, the cross-sectional shape of the intake path 72 is also generally elliptical. When the first top opening 70 is viewed along the front-to-back direction (i.e., the direction in which the intake path 72 extends), the centrifugal fan 26 can be visually identified through the first top opening 70. Therefore, the airflow path from the first top opening 70 to the centrifugal fan 26 becomes straight, resulting in lower flow resistance. This increases the airflow rate drawn by the blower 2.

[0059] like Figure 7 As shown, the largest diameter of the inscribed circles that are internally tangent to the first tip opening 70 when viewed along the front-back direction (i.e., the extension direction of the air intake path 72) is defined as the first largest inscribed circle C1. The diameter of the first largest inscribed circle C1 is in the range of 20 mm to 50 mm, for example, 45 mm. By making the diameter of the first largest inscribed circle C1 within this range, the first tip opening 70 is wide enough to not cause excessive pressure loss, wide enough to prevent debris (fallen leaves, etc.) from getting caught, and narrow enough to prevent the user's palm (or arm) from passing through. In addition, the air intake path 72 (refer to...) Figure 6 The diameter of the largest inscribed circle of the cross-section of the intake path 72 increases as it moves away from the first top opening 70 (i.e., as it moves toward the rear). The diameter of the largest inscribed circle of the cross-section of the intake path 72 is less than 50 mm in the portion near the first top opening 70.

[0060] The second top opening 74 has a generally rectangular shape. Correspondingly, the cross-sectional shape of the air delivery path 76 is also generally rectangular. The largest diameter of the inscribed circles that are internally tangent to the second top opening 74 when viewed along the front-back direction (i.e., the direction of extension of the air delivery path 76) is defined as the second largest inscribed circle C2. The diameter of the second largest inscribed circle C2 is in the range of 20 mm to 50 mm, for example, 45 mm. By making the diameter of the second largest inscribed circle C2 within this range, the second top opening 74 is wide enough to avoid excessive pressure loss, and narrow enough that a user's palm (or arm) cannot pass through it. Additionally, the air delivery path 76 (refer to...) Figure 6 The diameter of the largest inscribed circle of the cross-section of the air supply path 76 increases as it moves away from the second top opening 74 (i.e., as it moves rearward). The diameter of the largest inscribed circle of the cross-section of the air supply path 76 is less than 50 mm in the portion near the second top opening 74.

[0061] like Figure 2 As shown, if the electric motor 22 is driven and the centrifugal fan 26 rotates when the switching lever 14 is in the collection position, the blower 2 performs the suction operation. At this time, the front blades 60 of the centrifugal fan 26 draw in air from the suction chamber 40 (i.e., the suction path 72) by rotation and send the air out to the first exhaust chamber 52. Thus, air from outside the blower 2 passes through the first top opening 70 (see reference 1). Figure 5 The airflow enters the intake path 72, passes through the intake path 72, the fan housing chamber 42, and the first exhaust chamber 52, and then enters the collection bag 20. The blower 2 utilizes this airflow to collect the garbage into the collection bag 20. For example, when the user directs the first top opening 70 of the intake nozzle 66 towards the ground, the garbage falling on the ground is sucked into the first top opening 70 along with the air. The garbage sucked into the first top opening 70 passes through the intake path 72 and reaches the fan housing chamber 42, where it is crushed by the rotating centrifugal fan 26 and the crushing blades 64. The crushed garbage is then sent out to the first exhaust chamber 52 along with the air and collected into the collection bag 20. In addition, the rear blades 62 of the centrifugal fan 26, by rotating, draws in air from the motor housing chamber 46 and sends this air out to the first exhaust chamber 52 of the exhaust chamber 44. The air sent out to the first exhaust chamber 52 flows into the collection bag 20. Thus, external air from the blower 2 enters through multiple vents 78 formed on the side wall of the housing 4 (see reference). Figure 1 The airflow flows into the motor housing 46, passes through the motor housing 46, the fan housing 42, and the first exhaust chamber 52, and then flows into the collection bag 20. The blower 2 can use this airflow to cool the electric motor 22 and control device 24 housed in the motor housing 46.

[0062] like Figure 3 As shown, if the electric motor 22 is driven and the centrifugal fan 26 rotates when the switching lever 14 is in the non-collecting position, the blower 2 performs the air delivery operation. At this time, the front blades 60 of the centrifugal fan 26 draw in air from the intake chamber 40 (i.e., intake path 72) by rotation and deliver the air to the second exhaust chamber 54 (i.e., air delivery path 76). Thus, air from outside the blower 2 is delivered through the first top opening 70 (see reference 1). Figure 5 The air flows into the interior of the intake path 72, passes through the intake path 72, the fan housing 42 and the air supply path 76, and then through the second top opening 74 (see reference). Figure 5 The air flows out to the outside of the blower 2. In this way, the blower 2 can perform air delivery forward from the second top opening 74. The user can use the air delivered from the second top opening 74 to blow away, for example, garbage that has fallen to the ground. In addition, similarly to when performing a suction operation, the rear blades 62 of the centrifugal fan 26 generate airflow for cooling the electric motor 22 and the control device 24.

[0063] (Variation example)

[0064] (Reference Figure 2 The blower 2 may also be a prime mover other than the electric motor 22 (e.g., an internal combustion engine). In addition, the electric motor 22 may also be a motor other than a brushless motor (e.g., a brushed motor).

[0065] (Reference Figure 7 The diameter of the first largest inscribed circle C1 can also be less than 20 mm. Similarly, the diameter of the second largest inscribed circle C2 can also be less than 20 mm.

[0066] (Reference Figure 5 The length of the first flow path L1 can also exceed 850mm. Similarly, the length of the second flow path L2 can also exceed 850mm.

[0067] (Reference Figure 5 Blower 2 may also lack air delivery path 76 (i.e., air delivery nozzle 68 and second exhaust chamber 54), partition plate 50, and switching lever 14 (see reference). Figure 1 Therefore, blower 2 can also be configured not to deliver air (except for delivering air to collection bag 20).

[0068] (Reference Figure 6Alternatively, when viewing the first top opening 70 in the front-to-back direction (i.e., the direction of extension of the intake path 72), the centrifugal fan 26 may not be visually identifiable through the first top opening 70. On the other hand, when viewing the second top opening 74 in the front-to-back direction (i.e., the direction of extension of the air supply path 76), the centrifugal fan 26 may be visually identifiable through the second top opening 74.

[0069] (Reference Figure 6 The shape of the first top opening 70 (and the cross-sectional shape of the intake path 72) may also have a shape other than a generally elliptical shape (e.g., a polygonal shape). The shape of the second top opening 74 (and the cross-sectional shape of the air delivery path 76) may also have a shape other than a generally rectangular shape (e.g., a circular shape).

[0070] (Reference Figure 2 Blower 2 may also have a fan other than centrifugal fan 26 (e.g., axial fan).

[0071] (Reference Figure 5 The front end of the first top opening 70 may also be offset backward from the front end of the collection bag 20. The front end of the second top opening 74 may also be offset backward from the front end of the collection bag 20.

[0072] (Features of Example 1)

[0073] In one or more embodiments, the blower 2 includes: a centrifugal fan 26; an electric motor 22 (an example of a prime mover) that drives the centrifugal fan 26; a housing 4 that houses the centrifugal fan 26 and the electric motor 22; an intake path 72 (or an air supply path 76) (an example of a ventilation path) extending from the centrifugal fan 26; and a first top opening 70 (or a second top opening 74) (an example of a top opening) formed at the top of the intake path 72 (or air supply path 76), communicating between the interior and exterior of the intake path 72 (or air supply path 76). When the centrifugal fan 26 is driven, air is drawn from the exterior to the interior of the intake path 72 via the first top opening 70 (or air is expelled from the interior to the exterior of the air supply path 76 via the second top opening 74). Inside the intake path 72 (or air supply path 76), there are no obstructions between the first top opening 70 (or the second top opening 74) and the centrifugal fan 26. The diameter of the first maximum inscribed circle C1 (or the second maximum inscribed circle C2) of the first apical opening 70 (or the second apical opening 74) is 50 mm or less.

[0074] According to the above structure, the first top opening 70 (or the second top opening 74) is narrow enough that a user's palm (or arm) cannot pass through. This prevents the user's palm (or arm) from entering the air intake path 72 (or air delivery path 76) through the first top opening 70 (or the second top opening 74), thus preventing the user's hand from reaching the centrifugal fan 26. Furthermore, since there are no obstructions between the first top opening 70 (or the second top opening 74) and the centrifugal fan 26 inside the air intake path 72 (or air delivery path 76), objects (such as dust) are prevented from remaining inside the air intake path 72 (or air delivery path 76). This prevents the inconvenience of removing objects from inside the air intake path 72 (or air delivery path 76), thus preventing a decrease in the ease of use of the blower 2. Therefore, according to the above structure, while preventing a decrease in the ease of use of the blower 2, it is possible to prevent the user's hand from reaching the centrifugal fan 26.

[0075] In one or more embodiments, the blower 2 includes: a centrifugal fan 26; an electric motor 22 (an example of a prime mover) that drives the centrifugal fan 26; a housing 4 that houses the centrifugal fan 26 and the electric motor 22; an intake path 72 (or an air supply path 76) (an example of a ventilation path) extending from the centrifugal fan 26; and a first top opening 70 (or a second top opening 74) (an example of a top opening) formed at the top of the intake path 72 (or air supply path 76), communicating between the interior and exterior of the intake path 72 (or air supply path 76). When the centrifugal fan 26 is driven, air is drawn from the exterior to the interior of the intake path 72 via the first top opening 70 (or air is expelled from the interior to the exterior of the air supply path 76 via the second top opening 74). Inside the intake path 72 (or air supply path 76), there are no obstructions between the first top opening 70 (or the second top opening 74) and the centrifugal fan 26. The diameter of the largest inscribed circle of the cross-section of the portion near the first top opening 70 (or the second top opening 74) in the intake path 72 (or the supply path 76) (an example of at least one portion of the ventilation path) is 50 mm or less.

[0076] According to the above structure, the portion near the first top opening 70 (or the second top opening 74) in the air intake path 72 (or air supply path 76) is so narrow that a user's palm (or arm) cannot pass through. This prevents the user's hand from reaching the centrifugal fan 26. Furthermore, since there are no obstructions inside the air intake path 72 (or air supply path 76) between the first top opening 70 (or the second top opening 74) and the centrifugal fan 26, objects (e.g., dust) can be prevented from remaining inside the air intake path 72 (or air supply path 76). This prevents the inconvenience of removing objects from inside the air intake path 72 (or air supply path 76), thus preventing a decrease in the ease of use of the blower 2. Therefore, according to the above structure, while preventing a decrease in the ease of use of the blower 2, it is possible to prevent the user's hand from reaching the centrifugal fan 26.

[0077] In one or more embodiments, the diameter of the first maximum inscribed circle C1 (or the second maximum inscribed circle C2) of the first top opening 70 (or the second top opening 74) is 20 mm or more.

[0078] When the first top opening 70 (or the second top opening 74) is too narrow, the pressure loss generated in the first top opening 70 (or the second top opening 74) when air flows through it is relatively large, and the output flow rate of the blower 2 or the suction flow rate of the blower 2 may decrease. According to the above structure, the excessive narrowness of the first top opening 70 (or the second top opening 74) can be prevented, thus reducing the pressure loss generated in the first top opening 70 (or the second top opening 74) when air flows through it. Therefore, the output flow rate of the blower 2 or the suction flow rate of the blower 2 can be increased. Furthermore, according to the above structure, since the first top opening 70 is moderately wide, when the blower 2 is used to perform air suction, it is possible to prevent the suction object (such as fallen leaves) that should be suctioned along with the air from getting caught in the first top opening 70. As a result, the blower 2 can be used to smoothly suction the suction object.

[0079] In one or more embodiments, the flow path length inside the intake path 72 (or delivery path 76) from the first top opening 70 (or the second top opening 74) to the centrifugal fan 26 is 850 mm or less.

[0080] Based on the above structure, the intake path 72 (or the delivery path 76) is relatively compact, so the user can easily move and operate the blower 2.

[0081] In one or more embodiments, when the first top opening 70 is viewed from the outside of the air intake path 72 along the extension direction of the air intake path 72, the centrifugal fan 26 can be visually identified through the first top opening 70.

[0082] According to the above structure, the airflow path from the first top opening 70 to the centrifugal fan 26 becomes straight, thus reducing flow resistance. This increases the airflow rate drawn by the blower 2.

[0083] In one or more embodiments, when the centrifugal fan 26 is driven, air is drawn from the outside to the inside of the intake path 72 via the first top opening 70.

[0084] According to the above structure, when the blower 2 performs air suction, objects (such as dust) are actively drawn into the interior of the suction path 72. In this case, the effect of having no obstructions between the first top opening 70 and the centrifugal fan 26 inside the suction path 72 can be significantly utilized (i.e., preventing objects from remaining inside the suction path 72).

[0085] In one or more embodiments, a centrifugal fan 26 is used.

[0086] Centrifugal fan 26, for example, is suitable for generating high-pressure airflow compared to axial fan. Therefore, based on the above structure, a blower 2 that generates high-pressure airflow, i.e., a blower 2 with high suction force, can be easily realized.

[0087] In one or more embodiments, the blower 2 further includes a collection bag 20, which is detachably mounted to the housing 4 in a space disposed outside the housing 4, and collects the suction material that is drawn in from the outside of the suction path 72 along with air through the first top opening 70. When the direction of drawing air in from the outside of the suction path 72 through the first top opening 70 (i.e., rearward) is designated as the first direction, and the opposite direction of the first direction (i.e., front) is designated as the second direction, the end of the first top opening 70 in the second direction (i.e., the front end of the first top opening 70) is offset in the second direction (i.e., front) compared to the end of the collection bag 20 mounted to the housing 4 in the second direction (i.e., the front end of the collection bag 20).

[0088] When the blower 2 is used to draw air, the collection bag 20 may sometimes be drawn towards the first top opening 70 along with the air, causing the collection bag 20 to shake. When the collection bag 20 shakes, the user may find it obstructive. According to the above structure, when the blower 2 is used to draw air, the drawing of the collection bag 20 towards the first top opening 70 along with the air can be prevented. Therefore, the shaking of the collection bag 20 can be suppressed, thus preventing the user from finding the collection bag 20 obstructive. Furthermore, according to the above structure, the blower 2 is more compact, allowing the user to easily move and operate the blower 2.

[0089] (Example 2: Blower 102)

[0090] like Figure 8 , Figure 9 As shown, the blower 102 includes a housing 104, a nozzle 106, a trigger lever 108, an output adjustment lever 110, a collection bag 112, and an electric motor 114 (see reference). Figure 11 ), control device 116 (refer to) Figure 10 ) and centrifugal fan 118 (refer to Figure 11 A battery pack B is detachably mounted on the lower rear part of the housing 104. The battery pack B contains a rechargeable secondary battery unit (e.g., a lithium-ion battery unit). The blower 102 operates using electricity supplied from the battery pack B. The blower 102 is in an air delivery mode for performing air delivery operations via nozzle 106. Figure 8 The configuration shown is the same as the suction configuration used to perform the suction operation of drawing air through nozzle 106. Figure 9 The blower 102 is selectively switched between the shown modes. In this embodiment, the blower 102 is set to the air delivery mode (shown in the diagram). Figure 8 In the configuration shown, the direction along the length of the nozzle 106 and from the housing 104 toward the nozzle 106 is designated as forward, and the opposite direction is designated as rearward. Additionally, the blower 102 is in a suction configuration (…). Figure 9 In the configuration shown, the direction along the length of the nozzle 106, and the direction from the housing 104 toward the nozzle 106, is designated as left, and the opposite direction is designated as right. The front-back direction is orthogonal to the left-right direction. In addition, the direction orthogonal to the front-back and left-right directions, and the direction from the housing 104 toward the battery pack B, is designated as downward, and the opposite direction is designated as upward.

[0091] like Figure 10 As shown, housing 104 includes a handle 120 that can be held by a user, a motor housing 122 that houses an electric motor 114, and a centrifugal fan 118 (see reference). Figure 11The fan housing 124 is located to the left of the motor housing 122. The internal space of the fan housing 124 communicates with the internal space of the motor housing 122. The internal space of the motor housing 122 communicates with the internal space of the handle 120. The handle 120 includes: a first connecting portion 126 extending upward from the upper surface of the motor housing 122 and then bending backward; a grip portion 128 extending downward from the rear end of the first connecting portion 126; and a second connecting portion 130 extending forward and upward from the lower end of the grip portion 128. The user can move the blower 102 by gripping the grip portion 128 with one hand. A control device 116 is housed in the lower part of the grip portion 128. The control device 116 supplies power to the electric motor 114 using power supplied from the battery pack B. The control device 116 controls the output of the electric motor 114 by adjusting the power supplied to the electric motor 114. The electric motor 114 is, for example, a brushless motor. The electric motor 114 rotates the shaft 132. The shaft 132 spans the motor housing 122 and the fan housing 124. The shaft 132 is connected to the centrifugal fan 118.

[0092] The trigger lever 108 is disposed on the front surface of the grip 128. The user can operate the trigger lever 108 with the index finger of the hand holding the grip 128. When the user presses the trigger lever 108 in, power is supplied from the battery pack B to the electric motor 114, which is driven, causing the centrifugal fan 118 to rotate. This allows the blower 102 to perform air suction or air delivery. When the user removes their hand from the trigger lever 108 and it is no longer pressed in, the power supply from the battery pack B to the electric motor 114 is cut off, and the air suction or air delivery performed by the blower 102 ceases.

[0093] like Figure 8 As shown, the output adjustment lever 110 is disposed on the outer surface of the grip portion 128. By moving the output adjustment lever 110, the user can switch the output of the electric motor 114 (i.e., the speed of the centrifugal fan 118) when the trigger lever 108 is pressed at multiple speeds.

[0094] The fan housing 124 includes a volute portion 134, an exhaust pipe 136 extending forward from the upper part of the volute portion 134, and an intake pipe 138 extending to the left from the left surface of the volute portion 134. The nozzle 106 can be selectively attached to or detached from either the exhaust pipe 136 or the intake pipe 138. The nozzle 106 is in air delivery mode when the blower 102 is in air delivery mode. Figure 8 When installed in the form shown, it is mounted on the exhaust pipe 136, and when the blower 102 is in the suction mode (as shown). Figure 9 (As shown in the diagram) it is installed in the suction tube 138. For example... Figure 9 As shown, the collection bag 112 is installed on the exhaust pipe 136 when the blower 102 is in suction mode.

[0095] like Figure 11 As shown, the centrifugal fan 118 includes a shaft portion 140, a circular plate portion 142, a left blade portion 144, and a right blade portion 146. The circular plate portion 142 extends radially outward from the outer peripheral surface of the shaft portion 140. The left blade portion 144 protrudes to the left from the left surface of the circular plate portion 142. The right blade portion 146 protrudes to the right from the right surface of the circular plate portion 142. The shaft portion 140 is fixed to the left side of the shaft 132. Therefore, the centrifugal fan 118 rotates integrally with the shaft 132. In addition, a filter portion 148 is formed inside the intake pipe 138 to prevent foreign objects from entering the fan housing 124 from the intake pipe 138.

[0096] like Figure 12 As shown, when the nozzle 106 is installed on the exhaust pipe 136, the internal space of the nozzle 106 communicates with the internal space of the exhaust pipe 136. A third top opening 150 is formed at the top of the nozzle 106, which communicates the internal space of the nozzle 106 with the external space of the blower 102. In this embodiment, the passage from the volute portion 134 through the exhaust pipe 136 and the nozzle 106 to the third top opening 150 is called the "air delivery path 152". The air delivery path 152 extends in the front-rear direction.

[0097] Inside the air supply path 152, there are no obstructions between the third top opening 150 and the centrifugal fan 118. In addition, the shortest flow path length from the third top opening 150 to the centrifugal fan 118, i.e., the third flow path length L3, is in the range of 50 mm or more and 850 mm or less, for example, 135 mm.

[0098] like Figure 13 As shown, the third tip opening 150 has a substantially circular shape. Correspondingly, the cross-sectional shape of the nozzle 106 is also substantially circular. The largest diameter of the inscribed circles tangent to the third tip opening 150 when viewed along the front-to-back direction (i.e., the extension direction of the air delivery path 152) is defined as the third largest inscribed circle C3. The diameter of the third largest inscribed circle C3 is in the range of 20 mm to 50 mm, for example, 42 mm. By making the diameter of the third largest inscribed circle C3 within this range, the third tip opening 150 is wide enough to avoid excessive pressure loss and narrow enough that a user's palm (or arm) cannot pass through it. Furthermore, since the third tip opening 150 in this embodiment has a substantially circular shape, the diameter of the third largest inscribed circle C3 is equivalent to the inner diameter of the third tip opening 150. Furthermore, the diameter of the maximum inscribed circle of the nozzle 106's cross-section increases as it moves away from the third tip opening 150 (i.e., as it moves rearward). The diameter of the maximum inscribed circle of the nozzle 106's cross-section is less than 50 mm in the portion near the third tip opening 150.

[0099] like Figure 12 As shown, when the blower 102 is in the air delivery mode (i.e., the mode in which the nozzle 106 is installed on the exhaust pipe 136), the electric motor 114 (refer to...) Figure 11 Driven by the centrifugal fan 118, the blower 102 performs the air delivery operation. At this time, the left blade portion 144 of the centrifugal fan 118 rotates and passes through the suction pipe 138 (see reference). Figure 11 The blower 102 draws in air from outside and directs it radially outward toward the centrifugal fan 118. The air directed radially outward toward the centrifugal fan 118 flows along the inner surface of the volute 134 toward the exhaust pipe 136. The air flowing into the exhaust pipe 136 passes through the exhaust pipe 136 and the nozzle 106, and exits from the third top opening 150 toward the outside of the blower 102. Thus, the blower 102 can perform forward air delivery from the third top opening 150. Furthermore, Figure 11 The right-side blade portion 146 of the centrifugal fan 118, as shown, draws air into the motor housing 122 by rotation. Simultaneously, external air to the blower 102 is drawn in via an air vent (not shown) formed in the motor housing 122 and an air vent 154 formed at the lower part of the handle 120 (see reference). Figure 8 Air flows into the motor housing 122 and the handle 120 respectively. Air flowing into the handle 120 passes through the second connection 130 (see reference). Figure 10 The air drawn in from the motor housing 122 flows into the motor housing 122. Additionally, the right-side blade portion 146 directs the air drawn into the motor housing 122 radially outward toward the centrifugal fan 118. The air directed radially outward toward the centrifugal fan 118 flows along the inner surface of the volute portion 134 toward the exhaust pipe 136 (see reference). Figure 12 ) flows in, passing through exhaust pipe 136 and nozzle 106 (see reference) Figure 12 ), from the third top opening 150 (refer to) Figure 12 The air flows out to the outside of the blower 102. The blower 102 in the air delivery mode can use the air flow to cool the electric motor 114 housed in the motor housing 122 and the control device 116 housed in the handle 120.

[0100] like Figure 14 As shown, when the nozzle 106 is installed on the suction pipe 138, the internal space of the nozzle 106 is in communication with the internal space of the suction pipe 138. In this embodiment, the passage from the third top opening 150 through the nozzle 106 and the suction pipe 138 to the volute portion 134 is called the "suction path 156". The suction path 156 extends in the left-right direction.

[0101] Inside the intake path 156, there is an obstruction (specifically, a filter section 148) between the third top opening 150 and the centrifugal fan 118. However, in another example, the intake path 156 may not have an obstruction (specifically, a filter section 148). Furthermore, the shortest flow path length from the third top opening 150 to the centrifugal fan 118, i.e., the fourth flow path length L4, is in the range of 50 mm or more and 850 mm or less, for example, 50 mm.

[0102] When the blower 102 is in suction mode (i.e., the centrifugal fan 118 is rotated by the electric motor 114, with the collection bag 112 installed in the exhaust pipe 136 and the nozzle 106 installed in the intake pipe 138), the blower 102 performs the suction operation. At this time, the airflow generated by the centrifugal fan 118 is the same as the air delivery operation described above. The blower 102 in suction mode can use this airflow to collect garbage into the collection bag 112. For example, if the user directs the third tip opening 150 of the nozzle 106 towards the ground, garbage falling on the ground is sucked into the third tip opening 150 along with air. The garbage sucked into the third tip opening 150 passes through the intake path 156 and reaches the fan housing 124, where it is broken up by the rotating centrifugal fan 118. The broken garbage, along with air, is sent out to the exhaust pipe 136 and collected into the collection bag 112.

[0103] Air drawn from the outside of the suction path 156 through the third top opening 150 flows to the right. If the left end of the third top opening 150 is offset to the right compared to the left end of the collection bag 112, there is a possibility that the collection bag 112, along with the air, might be drawn towards the third top opening 150 during air suction, causing it to sway. In contrast, in this embodiment, the left end of the third top opening 150 is offset to the left compared to the left end of the collection bag 112. Therefore, during air suction through the third top opening 150, it is possible to prevent the collection bag 112 from being drawn towards the third top opening 150 along with the air, thereby suppressing swaying of the collection bag 112.

[0104] (Variation example)

[0105] (Reference Figure 11 The blower 102 may also be a prime mover other than the electric motor 114 (e.g., an internal combustion engine). In addition, the electric motor 114 may also be a motor other than a brushless motor (e.g., a brushed motor).

[0106] (Reference Figure 13 The diameter of the third largest inscribed circle C3 can also be less than 20mm.

[0107] (Reference Figure 13 The shape of the third top opening 150 (and the cross-sectional shape of the nozzle 106) may also have a shape other than a roughly circular shape (e.g., a polygonal shape).

[0108] (Reference Figure 12 , Figure 14 The length of the third flow path, L3, can also exceed 850 mm. Similarly, the length of the fourth flow path, L4, can also exceed 850 mm.

[0109] (Reference Figure 11 Blower 102 may also have a fan other than centrifugal fan 118 (e.g., axial fan).

[0110] (Reference Figure 14 The left end of the third top opening 150 may also be offset to the right from the left end of the collection bag 112.

[0111] (Features of Example 2)

[0112] In one or more embodiments, the blower 102 includes: a centrifugal fan 118; an electric motor 114 (an example of a prime mover) driving the centrifugal fan 118; a housing 104 housing the centrifugal fan 118 and the electric motor 114; an air supply path 152 (or an air intake path 156) (an example of an air passage) extending from the centrifugal fan 118; and a third top opening 150 (an example of a top opening) formed at the top of the air supply path 152 (or air intake path 156), communicating between the interior and exterior of the air supply path 152 (or air intake path 156). When the centrifugal fan 118 is driven, air is delivered from the interior of the air supply path 152 to the exterior via the third top opening 150 (or air is drawn from the exterior of the air intake path 156 to the interior via the third top opening 150). Inside the air supply path 152 (or air intake path 156), there are no obstructions between the third top opening 150 and the centrifugal fan 118. The diameter of the third largest inscribed circle C3 of the third top opening 150 is less than 50 mm.

[0113] According to the above structure, the third top opening 150 is narrow enough that a user's palm (or arm) cannot pass through. This prevents the user's palm (or arm) from entering the air supply path 152 (or intake path 156) through the third top opening 150, thus preventing the user's hand from reaching the centrifugal fan 118. Furthermore, since there are no obstructions between the third top opening 150 and the centrifugal fan 118 inside the air supply path 152 (or intake path 156), objects (such as dust) are prevented from remaining inside the air supply path 152 (or intake path 156). This prevents the inconvenience of removing objects from inside the air supply path 152 (or intake path 156), thus preventing a decrease in the ease of use of the blower 102. Therefore, according to the above structure, while preventing a decrease in the ease of use of the blower 102, it is possible to prevent the user's hand from reaching the centrifugal fan 118.

[0114] In one or more embodiments, the blower 102 includes: a centrifugal fan 118; an electric motor 114 (an example of a prime mover) driving the centrifugal fan 118; a housing 104 housing the centrifugal fan 118 and the electric motor 114; an air supply path 152 (or an air intake path 156) (an example of an air passage) extending from the centrifugal fan 118; and a third top opening 150 (an example of a top opening) formed at the top of the air supply path 152 (or air intake path 156), communicating between the interior and exterior of the air supply path 152 (or air intake path 156). When the centrifugal fan 118 is driven, air is delivered from the interior of the air supply path 152 to the exterior via the third top opening 150 (or air is drawn from the exterior of the air intake path 156 to the interior via the third top opening 150). Inside the air supply path 152 (or air intake path 156), there are no obstructions between the third top opening 150 and the centrifugal fan 118. The diameter of the largest inscribed circle of the cross-section of the portion near the third top opening 150 in the air supply path 152 (or the intake path 156) (an example of at least one portion of the ventilation path) is 50 mm or less.

[0115] According to the above structure, the portion near the third top opening 150 in the air supply path 152 (or intake path 156) (an example of at least one portion of the air passage) is narrow enough that a user's palm (or arm) cannot pass through. This prevents the user's hand from reaching the centrifugal fan 118. Furthermore, since there are no obstructions inside the air supply path 152 (or intake path 156) between the third top opening 150 and the centrifugal fan 118, it prevents objects (e.g., dust) from remaining inside the air supply path 152 (or intake path 156). This prevents the inconvenience of removing objects from inside the air supply path 152 (or intake path 156), thus preventing a decrease in the ease of use of the blower 102. Therefore, according to the above structure, it is possible to prevent a decrease in the ease of use of the blower 102 while simultaneously preventing the user's hand from reaching the centrifugal fan 118.

[0116] In one or more embodiments, the diameter of the third largest inscribed circle C3 of the third top opening 150 is 20 mm or more.

[0117] When the third top opening 150 is too narrow, the pressure loss generated at the third top opening 150 when air flows through it is significant, potentially reducing the air delivery flow rate of the blower 102 or the air suction flow rate of the blower 102. According to the above structure, the narrowness of the third top opening 150 can be prevented, thus reducing the pressure loss generated at the third top opening 150 when air flows through it. This increases the air delivery flow rate of the blower 102 or the air suction flow rate of the blower 102. Furthermore, according to the above structure, since the third top opening 150 is moderately wide, when the blower 102 performs air suction, it prevents objects to be suctioned (e.g., fallen leaves) from getting caught in the third top opening 150. This allows the blower 102 to smoothly suction objects.

[0118] In one or more embodiments, the flow path length inside the air supply path 152 (or air intake path 156) from the third top opening 150 to the centrifugal fan 118 is 850 mm or less.

[0119] According to the above structure, the air supply path 152 (or air intake path 156) is relatively compact, so the user can easily move and operate the blower 102.

[0120] In one or more embodiments, when the centrifugal fan 118 is driven, air is drawn from the outside to the inside of the intake path 156 via the third top opening 150.

[0121] According to the above structure, when the blower 102 performs air suction, objects (such as dust) are actively drawn into the interior of the suction path 156. In this case, the effect of having no obstructions between the third top opening 150 and the centrifugal fan 118 in the interior of the suction path 156 can be significantly utilized (i.e., preventing objects from remaining inside the suction path 156).

[0122] In one or more embodiments, a centrifugal fan 118 is used.

[0123] Centrifugal fan 118, for example, is suitable for generating high-pressure airflow compared to axial fan. Therefore, based on the above structure, a blower 102 that generates high-pressure airflow, i.e., a blower 102 with high suction force, can be easily realized.

[0124] In one or more embodiments, the blower 102 further includes a collection bag 112, which is detachably mounted to the housing 104 in a space disposed outside the housing 104, and collects the suction material drawn in from the outside of the suction path 156 along with air via the third top opening 150. When the direction of drawing air in from the outside of the suction path 156 via the third top opening 150 (i.e., to the right) is designated as the first direction, and the opposite direction of the first direction (i.e., to the left) is designated as the second direction, the end of the third top opening 150 in the second direction (i.e., the left end of the third top opening 150) is offset in the second direction (i.e., to the left) from the end of the collection bag 112 mounted on the housing 104 in the second direction (i.e., the left end of the collection bag 112).

[0125] When the blower 102 is used to draw air in, the collection bag 112 may sometimes be drawn towards the third top opening 150 along with the air, causing the collection bag 112 to shake. When the collection bag 112 shakes, the user may find it obstructive. According to the above structure, when the blower 102 is used to draw air in, the drawing of the collection bag 112 towards the third top opening 150 along with the air can be prevented. Therefore, shaking of the collection bag 112 can be suppressed, thus preventing the user from finding the collection bag 112 obstructive. Furthermore, according to the above structure, the blower 102 is more compact, allowing the user to easily move and operate the blower 102.

Claims

1. A blower, wherein, This blower has the following features: fan; Prime mover, which drives the fan; A housing that houses the fan and the prime mover; A ventilation path extends from the fan; as well as A top opening, formed at the top of the ventilation path, connects the interior and exterior of the ventilation path. When the fan is driven, it performs the following actions: either air is expelled from the inside of the ventilation path to the outside through the top opening, or air is drawn in from the outside of the ventilation path to the inside through the top opening. Inside the ventilation path, there are no obstructions between the top opening and the fan. The diameter of the largest inscribed circle of the top opening is less than 50 mm.

2. A blower, wherein, This blower has the following features: fan; Prime mover, which drives the fan; A housing that houses the fan and the prime mover; A ventilation path extends from the fan; as well as A top opening, formed at the top of the ventilation path, connects the interior and exterior of the ventilation path. When the fan is driven, it performs the following actions: either air is expelled from the inside of the ventilation path to the outside through the top opening, or air is drawn in from the outside of the ventilation path to the inside through the top opening. Inside the ventilation path, there are no obstructions between the top opening and the fan. The diameter of the largest inscribed circle of the cross-section of at least one part of the ventilation path is less than 50 mm.

3. The blower according to claim 1 or 2, wherein, The diameter of the largest inscribed circle is 20 mm or more.

4. The blower according to any one of claims 1 to 3, wherein, The internal flow path length from the top opening to the fan in the ventilation path is less than 850 mm.

5. The blower according to any one of claims 1 to 4, wherein, When the top opening is viewed from the outside of the ventilation path along its extension direction, the fan can be visually identified through the top opening.

6. The blower according to any one of claims 1 to 5, wherein, When the fan is driven, air is drawn from the outside to the inside of the ventilation path through the top opening.

7. The blower according to claim 6, wherein, The fan is a centrifugal fan.

8. The blower according to claim 6 or 7, wherein, The blower also includes a collection bag, which is detachably mounted to the housing in a space outside the housing to collect the suction material drawn in along with the air from the outside to the inside of the ventilation path through the top opening. When the direction of drawing air from the outside to the inside of the ventilation path via the top opening is designated as the first direction, and the opposite direction of the first direction is designated as the second direction, the end of the top opening in the second direction is offset in the second direction from the end of the collection bag mounted on the housing in the second direction.

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