Blower nozzle

Abstract

This invention provides a blower nozzle. The nozzle has a mounting portion and a main body, wherein the mounting portion is configured to be mounted on a blower, and the main body is connected to the mounting portion. The main body has an outlet and a passage connected to the outlet, through which air delivered by the blower passes. The main body includes a flexible tube. The flexible tube has a length of at least 15 cm and defines at least a portion of the passage. Because the nozzle is detachably mounted on an electric blower, the convenience of the blower is improved.

Description

Technical Field

[0001] This invention relates to a nozzle that can be installed in an electric blower. Background Technology

[0002] An electrically powered blower is known to disperse dust and other particles by discharging air from a nozzle. For example, Japanese Patent Publication No. 2011-117442 discloses a blower (so-called dust blower) in which compressed air is generated by a centrifugal fan rotated by an electric motor, and the generated compressed air is ejected from a nozzle. In this blower, nozzles of different diameters and lengths can be selectively installed as needed. Summary of the Invention

[0003] [The technical problem the invention aims to solve]

[0004] The purpose of this invention is to provide a nozzle that can be detachably installed on an electric blower, thereby improving the convenience of the blower.

[0005] [Methods for solving technical problems]

[0006] According to one aspect of the present invention, a nozzle capable of being installed on an electrically powered blower is provided. The nozzle has a mounting portion and a main body portion. The mounting portion is configured to be installed on the blower. The main body portion is connected to the mounting portion. The main body portion has an outlet and a passage connected to the outlet, through which air delivered by the blower passes. Additionally, the main body portion includes a flexible tube. The flexible tube has a length of at least 15 centimeters (cm) and defines at least a portion of the passage.

[0007] According to this method, the user can bend the flexible tube, thus allowing for relatively free changes to the position and orientation of the outlet relative to the blower. Furthermore, since the flexible tube has a length of at least 15 cm, the position and orientation of the outlet can be changed over a wide range. Therefore, when the nozzle of this method is installed on the blower, the user can change the position of the discharged air over a wide range by deforming the flexible tube without moving the blower. Thus, the nozzle of this method improves the convenience of using the blower.

[0008] According to one aspect of the present invention, a nozzle capable of being mounted on an electrically powered blower is provided. The nozzle has a mounting portion and a main body. The mounting portion is configured to be mounted on the blower. The main body is formed in a cylindrical shape and protrudes from the mounting portion. The main body has an outlet and at least one vent, wherein the outlet is located at the protruding end of the main body, and the at least one vent is located on a side portion of the main body. The outlet is configured to receive a cylindrical protrusion for injecting air provided on an object to which air is supplied. The at least one vent opens to the protruding end of the main body and communicates with the outlet.

[0009] According to this method, a nozzle is implemented that is installed on a blower and can supply air to other objects via a protrusion for air injection. The nozzle of this method can improve the convenience of the blower. In addition, in the nozzle of this method, even when the flow rate of air discharged from the protrusion inserted to the outlet (i.e., supplied to the object) is small, the possibility of surge can be reduced because air is discharged through at least one vent.

[0010] According to one aspect of the present invention, a nozzle capable of being installed on an electrically powered blower is provided. The nozzle has a mounting portion and a main body portion. The mounting portion is configured to be installed on the blower. The main body portion protrudes from the mounting portion. The main body portion has multiple discharge ports. According to this aspect, a nozzle capable of being installed on a blower and discharging air from multiple discharge ports to a large area is realized. The nozzle of this aspect improves the convenience of using a blower.

[0011] According to one aspect of the present invention, a nozzle capable of being installed in an electrically powered blower is provided. The nozzle comprises a plurality of cylindrical components detachably connected to each other. At least two of the cylindrical components are screwed together. According to this configuration, the length of the nozzle in the airflow direction can be shortened by disassembling at least one of the cylindrical components. Therefore, a nozzle whose length can be adjusted by the user according to actual usage is achieved. This nozzle improves the convenience of the blower. Furthermore, since at least two of the cylindrical components are connected by screwing, a nozzle that is less prone to air leakage from the connection points of the cylindrical components and whose positional relationship is less likely to change even when an external force is applied to the nozzle is present is achieved. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of a dust blower.

[0013] Figure 2 This is a 3D view of the nozzle.

[0014] Figure 3 This is a side view of the nozzle.

[0015] Figure 4 yes Figure 3 Sectional view IV-IV.

[0016] Figure 5 This is a sectional view of the base component.

[0017] Figure 6 yes Figure 5 Sectional view VI-VI.

[0018] Figure 7 This is a rear view of the base component.

[0019] Figure 8 yes Figure 4 A magnified view of a portion of the image.

[0020] Figure 9 This is a rear view of the nozzle.

[0021] Figure 10 yes Figure 3 XX sectional view.

[0022] Figure 11 This is a 3D exploded view of the nozzle.

[0023] Figure 12 This is a cross-sectional view of the front cover and locking mechanism.

[0024] Figure 13 This is a 3D view of the front cover and locking mechanism.

[0025] Figure 14 It is a 3D diagram of the locking sleeve.

[0026] Figure 15 This is a side view of the locking sleeve.

[0027] Figure 16 yes Figure 15 XVI-XVI sectional view.

[0028] Figure 17 It is a 3D diagram of the sliding sleeve.

[0029] Figure 18 This is an illustration of the locking mechanism's operation during the process of installing the nozzle onto the blower.

[0030] Figure 19 This is an illustration of the locking mechanism when the nozzle is positioned in the installation position.

[0031] Figure 20 This is a perspective view of the locking mechanism when the nozzle is positioned in the installation position.

[0032] Figure 21 This is a 3D view of the locking mechanism during the process of disassembling the nozzle from the main body of the blower.

[0033] Figure 22 This is an illustrative diagram of an example of a protrusion used for injecting air.

[0034] Figure 23 This is a 3D view of another nozzle.

[0035] Figure 24 This is a side view of the nozzle.

[0036] Figure 25 yes Figure 24 XXV-XXV sectional view.

[0037] Figure 26 yes Figure 25 XXVI-XXVI sectional views.

[0038] Figure 27 This is a 3D view of another nozzle.

[0039] Figure 28 This is a side view of the nozzle.

[0040] Figure 29 yes Figure 28 XXIX-XXIX sectional view.

[0041] Figure 30 yes Figure 29 XXX-XXX sectional view.

[0042] Figure 31 This is a partial cross-sectional view of another nozzle.

[0043] Figure 32 yes Figure 31 Sectional view of XXXII-XXXII.

[0044] Figure 33 This is a cross-sectional view of another nozzle.

[0045] Figure 34 This is a cross-sectional view of another nozzle.

[0046] Figure 35 yes Figure 34 A magnified view of a portion of the image.

[0047] Figure 36 yes Figure 34 Another enlarged view of a portion of the image.

[0048] Explanation of reference numerals in the attached figures

[0049] 1: Nozzle; 10: Base component; 11: Mounting part; 111: Locking piece; 112: Claw; 113: Front end face; 14: Rear end face; 115: Inclined surface; 117: Actuating protrusion; 118: Rear end face; 12: Holding part; 125: Ventilation resistance component; 13: Outer cylinder; 130: Ventilation passage; 131: Inlet; 132: Ventilation port; 134: Opening; 135: Recess; 137: Opening; 14: Inner cylinder; 141: Rib; 145: Locking protrusion; 146: Curved surface; 147: Orthogonal surface; 148: Inclined surface; 16: Flexible tube; 16 0: Passage; 161: Inlet; 162: Outlet; 165: Locking hole; 166: Locking hole; 17: Engaging component; 17A: First component; 171A: Protrusion; 17B: Second component; 171B: Protrusion; 174: Protrusion; 175: Rear end; 18: Cover; 185: Protrusion; 2: Nozzle; 22: Main body; 220: Passage; 221: Inlet; 222: Outlet; 225: Cylinder wall; 23: Stop; 231: Pin; 24: Vent; 28: Object; 280: Protrusion; 281: Passage; 282: Inlet; 283 1: Outlet; 285: Bolt; 287: Valve; 3: Nozzle; 32: Main body; 320: Passage; 321: Main passage; 322: Branch passage; 325: Inlet; 326: Outlet; 4: Nozzle; 5: Nozzle; 6: Nozzle; 600: Passage; 61: First component, retaining part; 612, 62: Second component; 621: Base end; 622: Top end; 625: Flexible area; 627: External thread; 63: Third component; 631: Base end (internal thread); 632: Top end; 635: Protrusion; 8: Dust blower; 81: Main body housing ; 810: Inlet; 811: Cylindrical part; 813: Front cover; 814: Shoulder; 82: Nozzle part; 820: Outlet; 83: Handle; 831: Trigger; 832: Switch; 835: Battery; 881: Motor; 882: Output shaft; 885: Centrifugal fan; 89: Nut; 9: Locking mechanism; 91: Locking sleeve; 913: Locking groove; 915: Guide part; 916: Inclined surface; 917: Open groove; 93: Sliding sleeve; 931: Spring bearing part; 935: Bearing recess; 936: Abutment surface; 938: Limiting part; 95: Force-applying spring. Detailed Implementation

[0050] In one or more embodiments of the present invention, the flexible tube may also be connected to the mounting portion in a manner that prevents it from detaching from the mounting portion in the direction of airflow. According to this method, it is possible to prevent the flexible tube from detaching from the mounting portion due to air discharge.

[0051] In one or more embodiments of the invention, the nozzle may further include a shroud that covers at least a portion of the flexible tube. The shroud may also be formed of a material with a higher hardness than the flexible tube. The shroud may also be detachably mounted on the flexible tube. According to this method, the user can mount the shroud on the flexible tube as needed and operate the flexible tube in a state where at least a portion is not bent, thus improving operability.

[0052] In one or more embodiments of the present invention, the main body may also have at least one vent, which is disposed radially outside the flexible tube. That is, the main body may also have at least one vent different from the outlet. According to this method, even when the flow rate of air discharged from the outlet alone is relatively small, the total flow rate of air discharged from the nozzle can be increased because air flows out through at least one vent. Therefore, the possibility of surge can be reduced.

[0053] In one or more embodiments of the invention, the nozzle may further include a ventilation resistance component disposed in a ventilation passage leading to at least one ventilation port. According to this method, the ventilation resistance component can reduce the velocity of the air passing through the ventilation passage. Accordingly, the pressure of the air flowing out of the ventilation port can be reduced, thereby preventing high-pressure air from being blown to a position different from the position aligned with the exhaust port.

[0054] In one or more embodiments of the present invention, the main body may have a stop member. The stop member may also be configured to be disposed inside the main body and abut against the protrusion for air injection when it is inserted from the outlet. Furthermore, the axial length of at least one vent in the main body may be greater than the axial distance from the outlet to the stop member in the main body. According to this method, even when the protrusion for air injection is inserted from the outlet, air can reliably flow out from at least one vent to the outside of the main body.

[0055] In one or more embodiments of the present invention, multiple discharge ports may be arranged on the same surface and facing different directions from each other. According to this method, a nozzle capable of suppressing dimensions in directions orthogonal to the aforementioned surface and discharging air over a relatively large area can be achieved.

[0056] In one or more embodiments of the present invention, the nozzle mounting portion may also be configured such that when the nozzle is moved in a first direction relative to the blower and positioned in a predetermined mounting position relative to the blower, the nozzle mounting portion is locked in the mounting position in a manner that prevents it from moving in a second direction opposite to the first direction. According to this method, the user can lock the blower mounting portion by moving the nozzle in only one direction. Therefore, a nozzle with excellent operability can be achieved.

[0057] In one or more embodiments of the invention, the plurality of cylindrical components may include at least: a first component configured to be mounted on a blower; and a second component detachably connected to the first component. The portion of the second component adjacent to the first component downstream of the first component in the airflow direction may also be configured to be more flexible than other portions of the nozzle. In this case, even when an external force is applied to the nozzle, the load on other portions can be reduced by flexing the portion of the second component adjacent to the first component, thus decreasing the likelihood of nozzle damage.

[0058] The first to sixth representative and non-limiting embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0059] [First Implementation Method]

[0060] The following reference Figures 1 to 21 The nozzle 1 according to the first embodiment will be described. The nozzle 1 is additionally mounted to the nozzle section 82 of the dust blower 8 and used with the dust blower 8. Various nozzles can be selectively mounted on the nozzle section 82 of the dust blower 8. The user can use the dust blower 8 with or without a nozzle, depending on the job requirements. The nozzle 1 of this embodiment is an example of a nozzle that can be mounted on the dust blower 8.

[0061] First, the general structure of the blower 8 will be explained.

[0062] The dust blower 8 is an example of an electrically powered blower. More specifically, the dust blower 8 is a type of blower capable of blowing away dust and other particles by discharging compressed air. Figure 1 As shown, the blower 8 has a main housing 81 and a handle 83. A motor 881 and a centrifugal fan 885 are housed within the main housing 81. The output shaft 882 of the motor 881 and the centrifugal fan 885 are integrally driven to rotate about a rotation axis A0. The main housing 81 extends along the rotation axis A0. An opening (inlet) 810 for drawing air into the main housing 81 is provided at one axial end of the main housing 81. A nozzle portion 82 is provided at the other axial end of the main housing 81. The nozzle portion 82 is formed as a cylinder about the rotation axis A0 and has an opening (outlet) 820 for discharging air from the main housing 81. The diameter of the outlet 820 is 13.0 mm. The handle 83 is the part held by the user, protruding from the main housing 81 and extending in a direction intersecting the rotation axis A0.

[0063] Furthermore, in the following description, for convenience, the extension direction of the rotation axis A0 is defined as the front-to-back direction of the blower 8. In the front-to-back direction, the direction from the suction port 810 to the discharge port 820 is defined as forward, and the opposite direction (from the discharge port 820 to the suction port 810) is defined as rearward. The direction orthogonal to the rotation axis A0 and corresponding to the extension direction of the handle 83 is defined as the up-down direction. In the up-down direction, the direction in which the handle 83 protrudes from the main body housing 81 (from the main body housing 81 to the protruding end of the handle 83) is defined as downward, and the opposite direction (from the protruding end of the handle 83 to the main body housing 81) is defined as upward. The direction orthogonal to both the front-to-back and up-down directions is defined as the left-to-right direction.

[0064] A trigger 831 is provided at the upper end of the handle 83. A switch 832 is housed inside the handle 83. A battery 835 for powering the motor 881 is detachably installed at the lower end of the handle 83. When the user presses the trigger 831, the switch 832 is activated, and the motor 881 is driven. Simultaneously, driven by the rotation of the centrifugal fan 885, air is drawn into the main housing 81 from the intake port 810, and the compressed air is discharged from the exhaust port 820. If a nozzle 1 is installed on the blower 8, the air discharged from the exhaust port 820 passes through the passage 160 of the nozzle 1 and exits from the exhaust port 162 (see reference 162). Figure 2 )discharge.

[0065] The detailed structure of nozzle 1 will be described below.

[0066] like Figure 2 As shown, the nozzle 1 has: a base component 10 which can be mounted on the blower 8; and a flexible tube 16 which is connected to the base component 10.

[0067] First, the base component 10 will be described. For example... Figures 1-4 As shown, the base component 10 is a long, cylindrical component extending along a predetermined axis A1. The base component 10 includes a mounting portion 11 and a retaining portion 12. In this embodiment, the mounting portion 11 and the retaining portion 12 are integrally formed from synthetic resin, but the mounting portion 11 and the retaining portion 12 may also be formed separately and connected to each other. The mounting portion 11 is configured to be mounted on the nozzle portion 82 of the blower 8 (more specifically, the locking mechanism 9, see reference 82). Figure 1 The retaining part 12 protrudes axially from one end of the mounting part 11. The retaining part 12 is the part that engages with the flexible tube 16 to retain the flexible tube 16. The retaining part 12 and the flexible tube 16 together constitute the main body of the nozzle 1.

[0068] Furthermore, in the following description, for convenience, the orientation of the nozzle 1 is defined based on the orientation in which the nozzle 1 is mounted on the dust blower 8. The nozzle 1 is mounted on the dust blower 8 such that the axis A1 of the base member 10 is aligned with the rotation axis A0. Therefore, the extension direction of the axis A1 (the axial direction of the base member 10) is defined as the front-rear direction. In the front-rear direction, the side of the mounting part 11 (the side connected to the dust blower 8) is the rear side of the nozzle 1, and the side of the holding part 12 is the front side of the nozzle 1.

[0069] like Figures 5-7 As shown, the mounting portion 11 is formed in a generally cylindrical shape. The mounting portion 11 has a locking mechanism 9 (see reference 9). Figure 1 A pair of locking tabs 111 engage. The pair of locking tabs 111 are symmetrically arranged across the axis A1 of the base member 10 and extend axially. The locking tabs 111 are the portion between the two slits extending forward from the rear end of the mounting portion 11. Therefore, the rear end of the locking tab 111 is a free end. With this structure, the locking tab 111 can elastically deform radially towards the nozzle 1 with its front end as a fulcrum.

[0070] The rear end of the locking piece 111 has a claw 112. The claw 112 protrudes radially inward from the rear end of the locking piece 111. The claw 112 has a front end face 113, a rear end face 114, and an inclined surface 115. The front end face 113 and the rear end face 114 are respectively surfaces that are approximately orthogonal to the axis of the nozzle 1. The inclined surface 115 is the surface that connects the radially inward end of the front end face 113 and the radially inward end of the rear end face 114, and it is inclined radially outward as it moves rearward.

[0071] Additionally, the rear end has an action protrusion 117. The action protrusion 117 protrudes radially outward from the outer surface of the rear end portion. The circumferential center of the action protrusion 117 is located at the same position as the circumferential center of the claw 112. Furthermore, the action protrusion 117 is positioned slightly forward of the claw 112, and its rear end is positioned slightly forward of the rear end of the rear end portion (the rear end face 114 of the claw 112). When viewed radially outward, the rear end face 118 of the action protrusion 117 is formed into a U-shape protruding rearward from the center. That is, the rear end face 118 of the action protrusion 117 is configured as a curved surface.

[0072] Furthermore, the detailed structure of the nozzle section 82 (locking mechanism 9) of the blower 8, as well as the installation and removal of the mounting section 11 relative to the nozzle section 82, will be described in detail later.

[0073] like Figures 5-7 As shown, the retaining part 12 is formed as a double-layered cylinder having an outer cylinder (cylinder wall) 13 and an inner cylinder (cylinder wall) 14 arranged coaxially.

[0074] The outer cylinder 13 is a cylindrical portion extending forward from the mounting portion 11. The outer cylinder 13 is formed as a stepped cylinder, with its outer diameter only larger at the rear end than the outer diameters of the other portions. The inner diameter of the outer cylinder 13 is uniform and slightly larger than the diameter of the outlet 820 of the blower 8. Four recesses 135 are provided at equal intervals in the circumferential direction on the inner circumferential surface of the rear end portion of the outer cylinder 13. The rear end of each recess 135 is open. Additionally, three rectangular openings 137 are provided at equal intervals in the circumferential direction at the front end portion of the outer cylinder 13. The openings 137 penetrate the outer cylinder 13 (cylinder wall) to connect the interior and exterior of the outer cylinder 13 and extend to the front end of the outer cylinder 13.

[0075] The inner cylinder 14 is a cylindrical portion having an inner diameter approximately the same as the outer diameter of the flexible tube 16. The inner cylinder 14 is arranged radially inside the outer cylinder 13, spaced apart from it. More specifically, the inner cylinder 14 is supported by three ribs 141 arranged circumferentially around axis A1, connected to the outer cylinder 13. Therefore, three spaces extending in the front-rear direction, divided circumferentially by the three ribs 141, are formed between the outer cylinder 13 and the inner cylinder 14 of the retaining portion 12. The rear end of the inner cylinder 14 is located forward of the rear end of the outer cylinder 13 (more specifically, forward of the recess 135) in the front-rear direction. The front end of the inner cylinder 14 is located rearward of the front end of the outer cylinder 13. Furthermore, the rear ends of the opening 137 of the outer cylinder 13 are located at the same positions as the front ends of the inner cylinder 14 in the front-rear direction.

[0076] The flexible tube 16 will be described below. For example... Figure 2 and Figure 4 As shown, the flexible tube 16 is a cylindrical component made of flexible synthetic resin. In this embodiment, the flexible tube 16 is formed of polyvinyl chloride (PVC) and has excellent flexibility. The flexible tube 16 is a cylindrical component with a circular cross-section, and has a uniform outer diameter and a uniform inner diameter when no external force is applied. In this embodiment, the inner diameter of the flexible tube 16 is 6 mm. In addition, the flexible tube 16 has a length of 70 cm.

[0077] One end of the flexible tube 16 is connected to the retaining portion 12. Hereinafter, the end of the flexible tube 16 connected to the retaining portion 12 will be referred to as the base end, and the opposite end will be referred to as the tip end. In this embodiment, when the nozzle 1 is installed on the dust blower 8, the centrifugal fan 885 of the dust blower 8 (see reference...) Figure 1 The air is delivered through the opening at the base of the flexible tube 16, passes through the passage 160 extending inside the flexible tube 16, and is discharged from the opening at the top. Hereinafter, the opening at the base of the flexible tube 16 (the inlet at the rear end of the passage 160) will be referred to as the inlet 161, and the opening at the top (the outlet at the front end of the passage 160) will be referred to as the outlet 162.

[0078] A cover 18 is mounted on a portion of the flexible tube 16, including its top end. The cover 18 is formed of a material with a higher hardness than the flexible tube 16 (e.g., a synthetic resin that is non-flexible or has much lower flexibility than the flexible tube 16). The cover 18 is a cylindrical component with an inner diameter that is approximately the same as the outer diameter of the flexible tube 16, which fits over the outer periphery of the flexible tube 16. Furthermore, anti-slip portions for preventing the flexible tube 16 from shifting are machined on the inner circumferential surface of the cover 18, but the user can properly pull the cover 18 out of the flexible tube 16 to remove it, or place the cover 18 in other positions on the flexible tube 16.

[0079] The connection structure between the flexible tube 16 and the retaining part 12 will be described below.

[0080] like Figure 4 , Figures 8-11 As shown, the flexible tube 16 is inserted into the inner cylinder 14. The base end of the flexible tube 16 protrudes rearward beyond the rear end of the outer cylinder 13. A locking member 17 is installed on one end of the flexible tube 16. The locking member 17 is a cylindrical component with an inner diameter slightly smaller than the outer diameter of the flexible tube 16. In this embodiment, the locking member 17 is composed of a first component 17A and a second component 17B. The first component 17A and the second component 17B are each a semi-cylindrical component, assembled in such a way that they abut against each other in a plane containing the axis of the locking member 17. Most of the first component 17A and the second component 17B have the same structure. The common structure of the first component 17A and the second component 17B will be described below with the same reference numerals.

[0081] The first component 17A has two protrusions 171A respectively disposed on the inner circumferential surfaces of its two ends in the axial direction. The protrusions 171A extend circumferentially and have a generally triangular cross-section. Conversely, the second component 17B has a protrusion 171B disposed on the inner circumferential surface of its central portion in the front-rear direction. The protrusion 171B extends circumferentially and has a generally triangular cross-section. A flexible tube 16 is disposed between the first component 17A and the second component 17B. When the first component 17A and the second component 17B are combined in an abutting manner, the first component 17A and the second component 17B press the flexible tube 16 radially inward, and the protrusions 171A and 171B engage with the outer circumferential surface of the flexible tube 16. Accordingly, the first component 17A and the second component 17B restrict the movement of the flexible tube 16 along the axial direction of the engaging component 17 and retain the flexible tube 16.

[0082] Furthermore, the protrusions 171A of the first component 17A and 171B of the second component 17B are positioned at different locations in the axial direction of the engaging component 17 in order to reduce the possibility of the flexible tube 16 breaking due to the application of load at the same location in the axial direction when the flexible tube 16 is stretched axially. However, the first component 17A and the second component 17B may also have the same structure.

[0083] Furthermore, the first component 17A and the second component 17B each have two protrusions 174 projecting radially outward from their outer circumferential surfaces. When the first component 17A and the second component 17B are combined, the four protrusions 174 are arranged at equal intervals in the circumferential direction. The rear end 175 of each protrusion 174 projects radially outward more than the other portions, such as... Figure 8 and Figure 9 As shown, it can fit into the recess 135 of the outer cylinder 13. On the other hand, as... Figure 8 and Figure 10 As shown, the portion of the protrusion 174 other than its rear end 175 can be fitted into the outer cylinder 13. The length of the protrusion 174 in the front-rear direction is approximately equal to the length from the rear end of the inner cylinder 14 to the rear end of the outer cylinder 13. With one end of the flexible tube 16 clamped, the first component 17A and the second component 17B are positioned circumferentially such that the rear end 175 of the protrusion 174 corresponds to the recess 135, and are embedded within the rear end of the outer cylinder 13. The first component 17A and the second component 17B are arranged in the front-rear direction at a position where the front end of the protrusion 174 abuts against the rear end of the inner cylinder 14. That is, the inner cylinder 14 restricts the forward movement of the engaging component 17.

[0084] With the connection structure described above, the flexible tube 16 is connected to the retaining part 12 via the engaging member 17 in a manner that prevents it from falling forward from the retaining part 12. Therefore, when the nozzle 1 is installed on the blower 8 for use, it is possible to prevent the flexible tube 16 from falling off the retaining part 12 (base member 10) due to air discharge.

[0085] In addition, such as Figure 8 As shown, when the nozzle 1 is installed on the blower 8, the front end of the nozzle portion 82 of the blower 8, which is adjacent to the rear of the engaging member 17, restricts the rearward movement of the engaging member 17. On the other hand, as Figure 4 As shown, when the nozzle 1 is removed from the blower 8, the user can pull the flexible tube 16, with the cover 18 removed, along with the engaging member 17 from the retaining part 12 to the rear to remove the flexible tube 16. Therefore, the user can install a flexible tube with a different length and / or inner diameter than the flexible tube 16 into the retaining part 12 via the engaging member 17 as needed.

[0086] As explained above, the nozzle 1 of this embodiment has a flexible tube 16 with an outlet 162 and a passage 160 connected to the outlet 162. Since the user can bend the flexible tube 16, the position and orientation of the outlet 162 relative to the blower 8 can be changed relatively freely. In particular, since the flexible tube 16 has a length of 70 cm, the user can change the position and orientation of the outlet 162, i.e., the position and direction of the air, within a very wide range, even without moving the blower 8. For example, the user can insert the flexible tube 16 into a space that is too narrow for inserting the blower 8 and blow air to the desired position. Thus, the nozzle 1 improves the convenience of the blower 8.

[0087] Additionally, a non-flexible cover 18 can be installed on the flexible tube 16. Therefore, the user can install the cover 18 in the desired position on the flexible tube 16 as needed. The user can operate the flexible tube 16 without bending the part covered by the cover 18 (e.g., the top end), thus the cover 18 improves the operability of the flexible tube 16.

[0088] Furthermore, the nozzle 1 of this embodiment has a structure for preventing surge. Specifically, in addition to the outlet 162, the nozzle 1 is provided with an air vent 132 for increasing the flow rate of air discharged from the nozzle 1.

[0089] Surge refers to the periodic vibration of pressure and flow rate within a pipe caused when a blower, compressor, or similar device is connected to a pipeline and the flow rate of the discharged gas is throttled below normal. The characteristics of a blower are typically represented by characteristic curves (also called performance curves, pressure curves, etc.) on the horizontal and vertical axes, respectively, showing the flow rate and static pressure of the air discharged from the blower. It is known that surge occurs when the blower operates in the region where the characteristic curve rises to the right (the region where static pressure decreases as flow rate decreases; hereinafter referred to as the surge region). Furthermore, in the aforementioned curves, the surge region is the area to the left of the boundary (also called the surge line) determined according to the blower's specifications.

[0090] In this embodiment, the diameter of the outlet 820 of the blower 8 is 13.0 mm, while the inner diameter of the flexible tube 16, i.e., the diameter of the outlet 162, is 6.0 mm. The surge region is determined according to the specifications of the blower 8 (e.g., the specifications of the main housing 81, motor 881, centrifugal fan 885, etc.). Moreover, it is known that the flow rate when the blower 8 is connected to a pipe with an outlet diameter of 6.0 mm is in the surge region in the above-described curve. Therefore, surge occurs when the nozzle 1 is installed on the blower 8 and air is discharged only from the outlet 162.

[0091] Therefore, in this embodiment, as Figure 4 and Figure 8 As shown, in the nozzle 1, in addition to the outlet 162, a vent 132 is provided radially outside the flexible tube 16. The vent 132 additionally discharges air, increasing the total airflow from the nozzle 1 and thus preventing surge. The increased flow rate (i.e., the flow rate of air flowing out of the vent 132) required to prevent surge can be determined based on the characteristic curve of the blower 8 and the surge region (surge line). Furthermore, the required increase in flow rate can be achieved by appropriately setting (increasing) the area of ​​the vent 132. In this embodiment, the vent 132 is configured to prevent surge by increasing the total airflow from the nozzle 1 beyond the surge region.

[0092] More specifically, such as Figure 4 , Figure 8 , Figure 10 As shown, a ventilation passage 130 connected to the vent 132 is provided on the radially outer side of the flexible tube 16. The ventilation passage 130 is a passage extending in the front-rear direction inside the outer cylinder 13, and is formed by the following spaces: a space formed behind the rear end of the inner cylinder 14 between the outer cylinder 13 and the engaging member 17; a space formed between the outer cylinder 13 and the inner cylinder 14; and an annular space formed in front of the front end of the inner cylinder 14 between the front end of the outer cylinder 13 and the flexible tube 16. In this embodiment, when the nozzle 1 is installed on the dust blower 8, air delivered by the centrifugal fan 885 of the dust blower 8 flows in through the opening at the rear end of the ventilation passage 130 (hereinafter referred to as the inlet 131), flows out through the ventilation passage 130, and exits from the vent 132. Furthermore, in this embodiment, the vent 132 is formed by the opening 134 at the front end of the outer cylinder 13 and the three openings 137 mentioned above.

[0093] In this embodiment, a ventilation resistance member 125 is disposed at the front end of the ventilation passage 130 (the annular space between the front end of the outer cylinder 13 and the flexible tube 16). The ventilation resistance member 125 is configured to allow air to pass through its interior and to act as a resistance, thus reducing the flow rate. In this embodiment, a continuous bubble structure made of synthetic resin (e.g., a sponge made of polyurethane resin) is used as the ventilation resistance member 125. The ventilation resistance member 125 is formed in a cylindrical shape. The ventilation resistance member 125 is inserted into the front end of the outer cylinder 13 while the flexible tube 16 is inserted through it. The ventilation resistance member 125 is held in a slightly compressed state between the flexible tube 16 and the outer cylinder 13. The axial length of the ventilation resistance member 125 is approximately the same as the length in the longitudinal direction of the opening 137 provided on the cylinder wall of the outer cylinder 13.

[0094] With this configuration, air flowing into the ventilation passage 130 from the inlet 131 at the rear end of the outer cylinder 13, accompanying the operation of the blower 8, passes through the ventilation passage 130 and the ventilation resistance component 125, and flows out from the vent 132 towards the front of the outer cylinder 13 and radially outward of the outer cylinder 13. Since the total flow rate of air discharged from the outlet 162 and air flowing out from the vent 132 through the ventilation resistance component 125 is set to deviate from the surge region, surge does not occur at this time.

[0095] Furthermore, in this embodiment, the air velocity flowing out of the vent 132 decreases as it passes through the ventilation resistance member 125. Therefore, the air pressure flowing out of the vent 132 decreases compared to the case without the ventilation resistance member 125. This prevents high-pressure air from blowing from the vent 132 to unwanted locations. On the other hand, the air flow rate flowing out of the vent 132 decreases compared to the case without the ventilation resistance member 125. Therefore, in this embodiment, the area of ​​the vent 132 is set to be larger than the area required without the ventilation resistance member 125. Specifically, without the ventilation resistance member 125, even if the vent 132 consists only of the opening 134 at the front end of the outer cylinder 13, the total flow rate away from the surge region can be ensured. However, in this embodiment, because the ventilation resistance member 125 is provided, three openings 137 are provided in addition to the opening 134, thereby increasing the area of ​​the vent 132 and achieving the required increase in flow rate.

[0096] The structure of the nozzle section 82 and the locking mechanism 9 of the blower 8 will be described below.

[0097] like Figure 1 As shown, the main body housing 81 of the blower 8 includes a cylindrical portion 811 and a front cover 813 connected to the front end of the cylindrical portion 811. In this embodiment, the front cover 813 is a separate component from the cylindrical portion 811. The front cover 813 is screwed onto the front end of the cylindrical portion 811, covering the opening at the front end of the cylindrical portion 811. The front cover 813 is integrally formed in a funnel shape (conical shape) with a narrow tip. The nozzle portion 82 is the cylindrical front end of the front cover 813. A locking mechanism 9 is installed on the nozzle portion 82. The nozzle 1 is attached to and detached from the nozzle portion 82 via the locking mechanism 9.

[0098] The locking mechanism 9 is described below. The locking mechanism 9 is configured to lock the nozzle 1 in a predetermined installation position onto the blower 8. For example... Figure 12 As shown, the locking mechanism 9 includes: a locking sleeve 91, which is fixed to the blower 8; a sliding sleeve 93, which is configured to move only in the front-back direction relative to the locking sleeve 91; and a force-applying spring 95, which applies a force to the sliding sleeve 93 in the forward direction relative to the locking sleeve 91.

[0099] like Figures 12-16 As shown, the locking sleeve 91 is a cylindrical component. The locking sleeve 91 is coaxially fitted onto the nozzle portion 82 of the front cover 813 and is fixed to the front cover 813 by a nut 89.

[0100] Furthermore, the locking sleeve 91 is configured to engage with the nozzle 1. More specifically, the locking sleeve 91 has a mounting portion 11 for engaging with the nozzle 1 (see reference). Figure 5 The inner diameter (excluding the inner diameter of the claw 112) of the locking sleeve 91 is approximately equal to the outer diameter of the locking sleeve 91. A pair of locking grooves 913 are formed on the outer peripheral surface of the locking sleeve 91. The pair of locking grooves 913 are symmetrically arranged across the axis of the locking sleeve 91. The locking groove 913 is a recess that is radially inward from the outer peripheral surface of the locking sleeve 91 and extends circumferentially around the axis. The locking groove 913 is configured to engage with the claw 112 of the locking piece 111 of the nozzle 1.

[0101] A guide portion 915 is provided on the front side of each locking groove 913 to smoothly guide the claw 112 of the locking piece 111 into the locking groove 913. The guide portion 915 is a recess that is radially inward from the outer peripheral surface of the locking sleeve 91 and extends from the front end of the locking sleeve 91 to near the front end of the locking groove 913. The guide portion 915 has an inclined surface 916 that slopes gently outward as it moves rearward.

[0102] Furthermore, an open groove 917 is connected to one end of each locking groove 913 in the circumferential direction. More specifically, the open groove 917 is connected to one of the two ends of the locking groove 913 in the circumferential direction, which is located on the clockwise side when the locking sleeve 91 is viewed from the front. The open groove 917 is a recess having approximately the same depth as the locking groove 913, which extends forward in a straight line to the front end of the locking sleeve 91. That is, the front end of the open groove 917 is open. The open groove 917 is provided to allow the claw 112 of the locking piece 111 to disengage from the locking groove 913 (i.e., to allow the nozzle 1 to move forward), and the circumferential width of the open groove 917 is slightly larger than the width of the claw 112 of the locking piece 111.

[0103] like Figure 12 , Figure 13 , Figure 17 As shown, the sliding sleeve 93 is a cylindrical component. The sliding sleeve 93 is disposed radially outside the locking sleeve 91 and is held so that it can only move axially (i.e., in the front-to-back direction) relative to the locking sleeve 91.

[0104] Additionally, the sliding sleeve 93 has an actuating protrusion 117 that can engage with the mounting portion 11 provided on the nozzle 1 (see reference). Figure 2A pair of receiving recesses 935 engage. The pair of receiving recesses 935 are symmetrically arranged across the axis of the slide sleeve 93. The receiving recess 935 is a recess that extends rearward from the front end of the slide sleeve 93, and when viewed from the radial outside, it is formed in a U-shape that is approximately adapted to the actuating protrusion 117 of the nozzle 1. The surface of the receiving recess 935 is defined as an abutment surface 936 that can abut against the rear end surface 118 of the actuating protrusion 117, and is configured as a curved surface.

[0105] like Figure 12 As shown, the force-applying spring 95 is radially disposed between the locking sleeve 91 and the sliding sleeve 93. Furthermore, the force-applying spring 95 in this embodiment is a compression coil spring. The force-applying spring 95 is disposed in a compressed state between the spring receiving portion 931 and the shoulder portion 814 in the front-to-back direction, wherein the spring receiving portion 931 is disposed inside the sliding sleeve 93, and the shoulder portion 814 is disposed on the front cover 813 behind the nozzle portion 82. The force-applying spring 95 always applies force to the sliding sleeve 93 in the forward direction. Therefore, the sliding sleeve 93 is held in the foremost position in the initial state when the nozzle 1 is not installed in the locking mechanism 9. Additionally, the receiving recess 935 of the sliding sleeve 93 is disposed radially outside the guide portion 915 of the locking sleeve 91.

[0106] The operation of locking mechanism 9 will be explained below.

[0107] First, the operation of the locking mechanism 9 when the nozzle 1 is installed on the blower 8 will be explained.

[0108] When installing nozzle 1 onto the blower 8, the user performs an operation that moves nozzle 1 in a straight line toward the blower 8 in a rearward direction (hereinafter also referred to as the installation operation). More specifically, with the circumferential position of nozzle 1 properly adjusted relative to locking mechanism 9, the user presses nozzle 1 into locking mechanism 9 from the front along rotation axis A0. Furthermore, markings for position adjustment can be provided on nozzle 1 (see reference 8). Figure 5 The action protrusion 117 on the outer surface of the locking piece 111 and the sliding sleeve 93 (see reference) Figure 17 The bearing recess 935. Aligning the position of the action protrusion 117 with the bearing recess 935 in the circumferential direction is equivalent to aligning the position of the claw 112 with the guide 915, and even the claw 112 with the locking groove 913.

[0109] When the user presses the nozzle 1 into the locking mechanism 9, the claws 112 of a pair of locking plates 111 engage with the locking sleeve 91 (see reference). Figure 15 The pair of guide portions 915 abut against each other. More specifically, the inclined surface 115 of the claw 112 abuts against the inclined surface 916 of the guide portion 915. In this state, as the nozzle 1 moves rearward, the locking piece 111 elastically deforms by moving its rear end radially outward. Figure 18As shown, when the user further presses (moves) the nozzle 1 backward, the rear end face 114 of the claw 112 abuts against the contact surface 936 of the receiving recess 935 of the sliding sleeve 93, resisting the force of the force-applying spring 95, causing the sliding sleeve 93 to move backward relative to the locking sleeve 91. The portion of the nozzle 1 mounting portion 11 other than the locking piece 111 enters the gap between the locking sleeve 91 and the sliding sleeve 93.

[0110] When the claw 112 crosses the inclined surface 916 of the guide portion 915 and reaches the locking groove 913, as Figure 19 As shown, under the restoring force of the locking piece 111, the claw 112 moves radially inward and returns to its initial position, engaging with the locking groove 913. At this time, the rear end face 114 of the claw 112 disengages from the abutment face 936 of the receiving recess 935, and the rearward pressing on the slide sleeve 93 is released. Therefore, the slide sleeve 93 moves forward due to the force of the force spring 95, and the abutment face 936 of the receiving recess 935 is held in a position abutting against the rear end face 118 of the actuating protrusion 117 of the nozzle 1 (hereinafter also referred to as the locked position). That is, the actuating protrusion 117 is held in a state of being engaged with the receiving recess 935.

[0111] like Figure 19 As shown, when the sliding sleeve 93 is positioned in the locked position, the portion (wall portion) of the sliding sleeve 93 located between the rear end (deepest part of the recess) of the receiving recess 935 and the front end of the spring receiving portion 931 is positioned radially outward from the rear end (pawl 112) of the locking piece 111. This wall portion functions as a limiting portion 938, which maintains the engagement of the pawl 112 with the locking groove 913 by limiting the elastic deformation of the locking piece 111 in the direction in which the pawl 112 disengages from the locking groove 913. Additionally, as... Figure 20 As shown, when the sliding sleeve 93 is subjected to a forward force, the nozzle 1 is restricted from rotating around the rotation axis A0 by the engagement of the recess 935 and the action protrusion 117.

[0112] Thus, the locking mechanism 9 locks the nozzle 1 in the position where the claw 112 engages with the locking groove 913 (hereinafter, the position of the nozzle 1 at this time is also referred to as the mounting position), preventing it from moving forward. In addition, the locking mechanism 9 restricts the rotation of the nozzle 1 configured in the mounting position.

[0113] The following describes the operation of the locking mechanism 9 when the nozzle 1 is removed from the blower 8.

[0114] The user disassembles the blower 8 as follows Figure 20When the nozzle 1 is locked in the installation position as shown, firstly, in order to release the lock of the locking mechanism 9, an operation is performed to rotate the nozzle 1 relative to the blower 8 about the axis (hereinafter also referred to as the lock release operation). More specifically, the user pinches the nozzle 1 and rotates it clockwise about the rotation axis A0 when viewed from the front. As described above, the slide sleeve 93 is forced forward in a non-rotating state, and the actuating protrusion 117 is engaged in the receiving recess 935. When the user rotates the nozzle 1 against the force of the force spring 95, the circumferential force is converted into an axial force and acts on the slide sleeve 93 through the cooperative action of the end of the rear end face 118 (bent surface) of the actuating protrusion 117 in the rotation direction side (clockwise direction side when viewed from the front) and the end of the abutment surface 936 (bent surface) of the receiving recess 935 in the rotation direction side, causing the slide sleeve 93 to move backward.

[0115] like Figure 21 As shown, after the actuating protrusion 117 disengages from the receiving recess 935, the claw 112 engages in the locking groove 913 (see reference). Figure 14 , Figure 15 During circumferential movement along the inner edge, nozzle 1 rotates with the rear end face 118 of the actuating protrusion 117 abutting against the front end face of the sliding sleeve 93. When the user continues to rotate nozzle 1, the claw 112 enters the open groove 917 (see reference). Figure 14 , Figure 15 When the claw 112 is fully positioned within the open slot 917 (the position of the nozzle 1 at this time is also referred to as the disassembled position), the locking of the claw 112 relative to the locking slot 913 is released, allowing the claw 112 to move forward along the open slot 917. That is, the locking mechanism 9 is released.

[0116] After rotating nozzle 1 to the disassembly position, the user moves nozzle 1 forward in a straight line relative to the blower 8 to separate it from the blower 8 (hereinafter also referred to as the separation operation). More specifically, the user pulls nozzle 1 forward from locking mechanism 9 along rotation axis A0. As described above, open groove 917 has approximately the same depth as locking groove 913. Therefore, when nozzle 1 moves forward in response to the separation operation, locking piece 111 does not elastically deform, and claw 112 can move forward within open groove 917. In addition, along with the forward movement of nozzle 1 and separation from blower, sliding sleeve 93 is moved to its foremost position by force applied by force spring 95 (see reference). Figure 12 When nozzle 1 separates from blower 8 (locking mechanism 9), nozzle 1 is disassembled.

[0117] As explained above, in response to the nozzle 1 moving rearward relative to the blower 8 and being positioned in a predetermined mounting position relative to the blower 8, the locking mechanism 9 is activated, locking the mounting portion 11 of the nozzle 1 in a position where it cannot move forward. Therefore, the user can lock the mounting portion 11 by simply moving the nozzle 1 in one direction (rearward). Thus, the mounting portion 11 provides excellent operability for the nozzle 1. Because the nozzle 1 is locked in a position where it cannot move forward, the nozzle 1 will not detach from the blower 8, whether the user pulls the nozzle 1 forward or air is expelled from the outlet 820 of the blower 8 into the nozzle 1.

[0118] [Second Implementation]

[0119] The following is for reference Figures 22-26 The nozzle 2 according to the second embodiment will be described. The nozzle 2 is another example of a nozzle that can be installed on the dust blower 8. Furthermore, a portion of the nozzle 2 in this embodiment has a structure substantially the same as that of the nozzle 1 in the first embodiment. Therefore, hereafter, for structures in the nozzle 2 that are substantially the same as those in the nozzle 1, the same reference numerals will be used and descriptions will be omitted or simplified, and the different structures will be described mainly. This will also be the case in the subsequent embodiments.

[0120] The nozzle 2 of this embodiment has a structure suitable for injecting air into a protrusion (also called an air plug) provided on an object for air supply. The object for air supply refers to an article that is used to inflate it with air (e.g., a swimming ring, a beach ball, an air cushion, etc.). Figure 22 This represents an example of a protrusion 280 with a known structure typically used for air injection. For example... Figure 22 As shown, the protrusion 280 is formed in a cylindrical shape. The protrusion 280 defines a passage 281 that connects the interior and exterior of the bag-shaped object 28. The outer diameter and inner diameter of the protrusion 280 are approximately 9.5 mm and 6.5 mm, respectively.

[0121] A protrusion 280 protrudes outward from the outer surface of the object 28. A plug 285 for blocking the opening (hereinafter referred to as inlet 282) of the passage 281 is connected to the outer end (protruding end) of the protrusion 280 located on the object 28. Additionally, a valve 287 is connected to the inner end of the protrusion 280 located on the object 28. The valve 287 is configured to block the opening (hereinafter referred to as outlet 283) of the passage 281 on the inner side of the object 28 using air pressure inside the object 28. Furthermore, the protrusion 280, plug 285, and valve 287 are integrally formed from a flexible synthetic resin (e.g., PVC).

[0122] like Figures 23-26As shown, the nozzle 2 has: a mounting portion 11 configured to be mounted on the nozzle portion 82 of the blower 8 (more specifically, the locking mechanism 9); and a main body portion 22 connected to the mounting portion 11. The mounting portion 11 and the main body portion 22 are integrally formed of synthetic resin.

[0123] The main body 22 protrudes forward from the front end of the mounting part 11 along the axis A2 of the nozzle 2. The main body 22 has a cylindrical wall 225. The wall 225 defines a passage 220 extending in the front-rear direction along the axis A2. Although detailed drawings are omitted, when the nozzle 2 is mounted on the blower 8, air delivered by the centrifugal fan 885 of the blower 8 flows in through the opening at the rear end of the wall 225 (the inlet at the rear end of the passage 220), passes through the passage 220, and is discharged from the opening at the front end of the wall 225 (the outlet at the front end of the passage 220). Hereinafter, the opening at the rear end of the wall 225 will be referred to as the inlet 221, and the opening at the front end of the wall 225 will be referred to as the outlet 222. The diameter of the front end of the passage 220 and the outlet 222 is 10.0 mm.

[0124] Additionally, a stop 23 is provided inside the cylinder wall 225. This stop 23 is used to define the position of the tip of the protrusion 280 (i.e., the insertion depth of the protrusion 280) when the protrusion 280 is inserted. More specifically, the stop 23 is a wall portion including the axis A2, which traverses the passage 220 and connects to the inner circumferential surface of the cylinder wall 225. The front end of the stop 23 is located rearward than the front end of the cylinder wall 225. Therefore, as... Figure 22 As shown, the protrusion 280 can be inserted into the passage 220 via the outlet 222 until the protruding end of the protrusion 280 abuts against the stop member 23. Furthermore, a pin 231 is mounted on the stop member 23. The pin 231 is configured to protrude forward from the outlet 222, and when the protrusion 280 is inserted into the passage 220, the pin 231 abuts against the valve 287 of the protrusion 280, thereby opening the valve 287. However, the pin 231 may be omitted.

[0125] like Figures 22-26 As shown, a vent 24 is provided on the cylinder wall 225. The vent 24 is an opening that penetrates the cylinder wall 225 and connects the interior (passage 220) of the cylinder wall 225 to the outside. The vent 24 opens axially from a position slightly rearward of the front end of the stop member 23 (i.e., close to the mounting portion 11) to the front end of the cylinder wall 225 and communicates with the discharge port 222. Alternatively, the vent 24 can be described as an opening that extends rearward from the front end of the cylinder wall 225 to a position slightly rearward of the front end of the stop member 23.

[0126] With this structure, when the protrusion 280 is inserted into the passage 220 via the outlet 222, the portion of the vent 24 from the front end of the cylinder wall 225 to the same position as the front end of the stop member 23 is blocked by the side of the protrusion 280. On the other hand, the passage 220 is connected to the outside of the cylinder wall 225 through the portion of the vent 24 that is rearward than the same position as the front end of the stop member 23.

[0127] In this embodiment, air is supplied to the object 28 with the protrusion 280 embedded in the front end of the passage 220. The diameter of the passage 220 and the outlet 222 of the nozzle 2 is 10.0 mm. However, the inner diameter of the protrusion 280 (the diameter of the outlet 283 of the passage 281) is 6.5 mm smaller. Moreover, it is known that when the blower 8 is connected to a pipe with an outlet diameter of 6.5 mm and operated, the flow rate is within the surge region determined by the specifications of the blower 8. Therefore, when the nozzle 2 is installed on the blower 8 and air is only discharged to the protrusion 280, surge may occur.

[0128] Therefore, in this embodiment, similar to the embodiment described above, the vent 24 is configured to prevent surge. The vent 24 is configured to prevent surge by increasing the total flow rate of air discharged from the outlet 283 of the passage 281 of the protrusion 280 and the air discharged from the vent 24 to outside the surge region. Specifically, the total air flow rate is set to deviate from the surge region by appropriately setting the area of ​​the portion of the vent 24 not blocked by the protrusion 280 (i.e., the portion further rearward than the stop member 23).

[0129] As the blower 8 operates, the air flowing into the passage 220 of the nozzle 2 is supplied to the object 28 through the protrusion 280 inserted into the outlet 222, and flows out from the vent 24. No surge occurs at this time.

[0130] As explained above, in this embodiment, a nozzle 2 is installed on the blower 8 and is capable of supplying air to other items via a protrusion for air injection. The nozzle 2 improves the convenience of the blower 8. Furthermore, in addition to having an outlet 222 that can receive the protrusion 280, the nozzle 2 also has a vent 24, thus reducing the possibility of surge. Additionally, in the nozzle 2, the insertion amount of the protrusion 280 into the insertion passage 220 is defined by a stop member 23, preventing the protrusion 280 from completely blocking the vent 24, thus reliably preventing surge. Moreover, the stop member 23 can be a simple protrusion or it can be omitted.

[0131] [Third Implementation Method]

[0132] The following reference Figures 27-30The nozzle 3 according to the third embodiment will now be described. The nozzle 3 is another example of a nozzle that can be installed on the dust blower 8. Furthermore, the nozzle 3 of this embodiment has a structure suitable for blowing air over a wide area.

[0133] like Figures 27-30 As shown, the nozzle 3 has: a mounting portion 11 configured to be mounted on the nozzle portion 82 (more specifically, the locking mechanism 9) of the blower 8; and a main body portion 32 connected to the mounting portion 11.

[0134] The main body 32 protrudes forward from the front end of the mounting portion 11 along the axis A3 of the nozzle 3. Most of the main body 32, including its rear end, is cylindrical, while the front end is fan-shaped with thickness. Furthermore, in this embodiment, the rear half of the main body 32 is integrally formed of synthetic resin with the mounting portion 11. Conversely, the front half of the main body 32, formed of synthetic resin independently of the rear half, is pressed into and connected to the rear half. However, the front and rear halves of the main body 32 may also be integrally formed and connected to the mounting portion 11, or the mounting portion 11 and the main body 32 may be integrally formed.

[0135] The main body 32 has a single inlet 325 and five outlets 326. The inlet 325 is located at the rear end of the main body 32 and is positioned on axis A3. The inlet 325 is a circular opening. The five outlets 326 are respectively and separately located at the fan-shaped front end of the main body 32. Each outlet 326 is a circular opening.

[0136] The passage 320 connecting the inlet 325 and the five outlets 326 includes a main passage 321 and five branch passages 322. The main passage 321 extends forward from the inlet 325 along the axis A3 of the nozzle 3. The main passage 321 is a passage with a circular cross-section and a uniform diameter. The branch passages 322 are also circular cross-sections and have a uniform diameter smaller than that of the main passage 321. The five branch passages 322 branch off from the front end of the main passage 321 and connect to the five outlets 326 respectively. All branch passages 322 have the same diameter. All axes of the branch passages 322 lie on the same plane containing the axis A3 of the nozzle 3. The central branch passage 322 extends along axis A3. Furthermore, on the plane containing the axis A3 of the nozzle 3, the angle between the axes of the two branch passages 322 at both ends is 120 degrees.

[0137] Furthermore, all five outlets 326 have the same diameter. The center of each outlet 326 is located on the plane containing the nozzle 3 along axis A3. The center of the central outlet 326 is located on axis A3. The centers of the five outlets 326 are arranged at approximately equal intervals.

[0138] The diameter of each outlet 326 is smaller than the diameter of the outlet 820 of the blower 8. However, the total area of ​​the five outlets 326 is smaller than that of the outlet 820 of the blower 8 (see reference). Figure 1 The area of ​​the nozzle 3 is relatively high, and the total flow from all outlets 326 is located outside the surge region. Therefore, there is no special vent in the nozzle 3 to prevent surge.

[0139] As the blower 8 operates, air flowing into the nozzle 3 from the inlet 325 passes through the main passage 321 and five branch passages 322, and exits from the five outlets 326. Therefore, the nozzle 3 can deliver air over a large area. In particular, the five outlets 326 are arranged on the same surface and face different directions. Thus, a nozzle 3 is realized that can deliver air over a large area along the surface while suppressing its size in directions orthogonal to the surface.

[0140] [Fourth Implementation Method]

[0141] The following reference Figure 31 and Figure 32 The nozzle 4 according to the fourth embodiment will be described. The nozzle 4 is another example of a nozzle that can be installed on the blower 8. The nozzle 4 of this embodiment is similar to the nozzle 1 of the first embodiment (see reference 10) in the connection structure between the flexible tube 16 and the base member 10. Figure 7 and Figure 8 The structure of nozzle 4 is essentially the same as that of nozzle 1, except for the connection structure.

[0142] like Figure 31 and Figure 32 As shown, nozzle 4, like nozzle 1, includes: a base component 10 comprising a mounting portion 11 and a retaining portion 12; and a flexible tube 16 connected to the base component 10. The retaining portion 12 includes an outer cylinder 13 and an inner cylinder 14 connected to the outer cylinder 13 via ribs 141. In this embodiment, a locking protrusion 145 protruding radially inward from the inner circumferential surface of the inner cylinder 14 is provided at the rear end of the inner cylinder 14. The locking protrusion 145 is formed in a generally rectangular shape and is configured parallel to the axis A4 of nozzle 4. The front end face of the locking protrusion 145 is formed as a gently curved curved surface 146. On the other hand, the rear end face of the locking protrusion 145 is formed as an orthogonal surface 147 substantially orthogonal to the axis A4. Furthermore, in this embodiment, only one locking protrusion 145 is provided at the same position as one of the three ribs 141 in the circumferential direction around the axis A4.

[0143] In this embodiment, a locking hole 165 is provided on the flexible tube 16 instead of a mounting engagement member 17. The locking hole 165 is a through hole that allows the locking protrusion 145 to engage. More specifically, the locking hole 165 is formed in a rectangular shape. The circumferential width of the locking hole 165 is approximately equal to that of the locking protrusion 145, and the length of the locking hole 165 in the front-rear direction is slightly larger than that of the locking protrusion 145.

[0144] When assembling the nozzle 4, with the locking hole 165 and the locking protrusion 145 aligned in a circumferential manner, the flexible tube 16 is inserted into the inner cylinder 14 from the front side of the base member 10. Since the front end face of the locking protrusion 145 is a curved surface 146, the rear end of the flexible tube 16 abuts against the curved surface 146 and elastically deforms, allowing it to move smoothly behind the locking protrusion 145. When the flexible tube 16 is positioned with the locking hole 165 facing the locking protrusion 145, the locking protrusion 145 is inserted into the locking hole 165, and the flexible tube 16 is connected to the base member 10 (retaining part 12). Furthermore, the position of the locking hole 165 in the longitudinal direction of the flexible tube 16 is set such that, when the flexible tube 16 is connected to the base member 10, the base end of the flexible tube 16 protrudes rearward beyond the rear end of the outer cylinder 13.

[0145] As explained above, the nozzle 4 of this embodiment, like the nozzle 1 of the first embodiment, allows for relatively free changes in the position and orientation of the outlet 162 relative to the blower 8. Furthermore, since the nozzle 4 has fewer parts than the nozzle 1, it is less expensive and easier to assemble. Moreover, because the rear end face of the locking protrusion 145 is an orthogonal plane 147, the possibility of the flexible tube 16 dislodging forward from the retaining part 12 (base member 10) due to air discharge can be effectively reduced.

[0146] [Fifth Implementation Method]

[0147] The following reference Figure 33 The nozzle 5 according to the fifth embodiment will be described. The nozzle 5 is another example of a nozzle that can be mounted on the blower 8. The nozzle 5 is related to the nozzle 1 of the first embodiment (see reference 1) in part of the structure of the base member 10 and in the connection structure between the flexible tube 16 and the base member 10. Figure 4 Furthermore, the nozzle 5 differs from the nozzle 4 of the fourth embodiment (see reference 10) in the connection structure between the flexible tube 16 and the base component 10. Figure 31 There are some differences. Apart from these differences, nozzle 5 is essentially the same as nozzle 1 or nozzle 4.

[0148] like Figure 33As shown, the nozzle 5 includes: a base component 10, which includes a mounting portion 11 and a retaining portion 12; and a flexible tube 16 connected to the base component 10. However, in this embodiment, in order to suppress surge, an air resistance component 125 is not provided in the air passage 130 formed between the outer cylinder 13 and the inner cylinder 14 of the retaining portion 12 (see reference). Figure 4 Air flows forward through ventilation passage 130 from opening 134.

[0149] In this embodiment, the base component 10 and the flexible tube 16 are connected in a detachable manner, similar to the fourth embodiment, by engaging the locking protrusion 145 with the locking hole 165. However, the front end face of the locking protrusion 145 is formed as an inclined surface 148 that gently slopes radially inward as it moves toward the rear.

[0150] Furthermore, in this embodiment, the cover 18 and the flexible tube 16 are detachably connected via the same connection structure as the base member 10 and the flexible tube 16. More specifically, a locking protrusion 185 protruding radially inward from the inner circumference is provided on the elongated cylindrical cover 18. The rear end face (the surface on the side of the base member 10) of the locking protrusion 185 is an inclined surface that gently slopes radially inward toward the rear (in the direction close to the base member 10). On the other hand, the front end face of the locking protrusion 185 is an orthogonal surface that is approximately orthogonal to the long axis of the cover 18. Therefore, the cover 18 can also be connected to the flexible tube 16 in the same way as the base member 10.

[0151] Furthermore, in this embodiment, the outlet 162 of the flexible tube 16 is disposed inside the cover 18, and the air discharged from the blower 8 passes through the flexible tube 16 and the inside of the cover 18 and is discharged from the opening (outlet) 182 at the top of the cover 18.

[0152] As explained above, in this embodiment, a nozzle 5 is provided that facilitates the connection between the flexible tube 16 and the base component 10, as well as the connection between the flexible tube 16 and the cover 18.

[0153] [Sixth Implementation Method]

[0154] The following reference Figures 34-36 The nozzle 6 according to the sixth embodiment will be described. The nozzle 6 is another example of a nozzle that can be installed on the blower 8. The nozzle 6 is configured to include a plurality of cylindrical components that are detachably connected to each other. The user can remove at least one of the plurality of cylindrical components according to the usage method, thereby adjusting the length of the nozzle 6.

[0155] like Figure 34As shown, the nozzle 6 has: a first component 61 that can be mounted on the blower 8; a second component 62 that is detachably connected to the first component 61; and a third component 63 that is detachably connected to the second component 62. Although detailed illustrations are omitted, inside the nozzle 6, a passage 600 is formed from the first component 61 through the second component 62 to the top of the third component 63, through which air discharged from the blower 8 passes when the nozzle 6 is mounted on the blower 8.

[0156] like Figure 34 and Figure 35 As shown, the first component 61 is a cylindrical component extending along a predetermined axis A6. The first component 61 includes a mounting portion 11, which is capable of being mounted on the nozzle portion 82 of the blower 8 (more specifically, a locking mechanism 9, see reference 1). Figure 1 The first component 61 has a retaining portion 612 that protrudes axially from one end of the mounting portion 11. The retaining portion 612 is formed in a conical shape, and its inner and outer diameters decrease towards the top of the retaining portion 612 (the end opposite to the mounting portion 11). The axial length of the first component 61 is, for example, in the range of 10 cm to 15 cm.

[0157] The first component 61 is formed of a synthetic resin and has rigidity to the extent that it will not substantially flex even when an external force is applied to it. That is, the first component 61 is substantially non-flexible. The first component 61 is, for example, formed of fiber-reinforced polyamide resin.

[0158] like Figures 34-36 As shown, the second component 62 is a long, cylindrical component. The length of the second component 62 is, for example, in the range of 30 to 40 cm. The second component 62 is integrally molded from synthetic resin (e.g., polyethylene resin). One end of the second component 62 in the long axis direction is detachably connected to the first component 61 (specifically, the retaining portion 612). Hereinafter, the end connected to the first component 61 will be referred to as the base end 621, and the end opposite to the base end 621 will be referred to as the top end 622. The base end 621 of the second component 62 is formed into a conical cylindrical shape, and the inner and outer diameters of the base end 621 decrease towards the top end 622. The base end 621 has a shape adapted to fit the retaining portion 612.

[0159] The second component 62 is connected to the first component 61 by fitting its base end portion 621 into the retaining portion 612. The portion of the second component 62, excluding the base end portion 621, protrudes forward from the first component 61. As described above, since the retaining portion 612 and the base end portion 621 are conical, the base end portion 621 cannot move forward relative to the first component 61 to a predetermined position. When the base end portion 621 is in the predetermined position, its rear end (i.e., the rear end of the second component 62) is positioned within the rear end of the retaining portion 612. Although detailed illustrations are omitted, when the nozzle 6 is installed onto the blower 8, the front end of the nozzle portion 82 of the blower 8 abuts against the rear end of the base end portion 621 located in the predetermined position, thereby restricting the second component 62 from moving rearward relative to the first component 61 (i.e., in the direction of disengagement from the first component 61).

[0160] The region (partial) adjacent to the base end 621 in the second component 62 is configured as a flexible region 625. This region (partial) adjacent to the base end 621 can also be described as the region (partial) adjacent to the first component 61 on the front side of the first component 61 (downstream side in the airflow direction within the nozzle 6) when the second component 62 is connected to the first component 61. The flexible region 625 is configured to be more flexible than other regions of the second component 62 (easily bendable). In this embodiment, a flexible bellows is formed in the flexible region 625.

[0161] In addition, such as Figure 34 and Figure 36 As shown, the second component 62 has an external thread portion 627. The external thread portion 627 is located forward of the central portion in the major axis direction of the second component 62. The external thread portion 627 has a protrusion that extends spirally along the circumference of the second component 62.

[0162] like Figure 34 and Figure 36 As shown, the third component 63 is a long, cylindrical component. In this embodiment, the length of the third component 63 is, for example, in the range of 30 to 40 cm. The third component 63 is integrally molded from synthetic resin (e.g., polyethylene resin). One end of the third component 63 in the long axis direction is detachably connected to the second component 62. Hereinafter, the end connected to the second component 62 will be referred to as the base end 631, and the end opposite to the base end 631 will be referred to as the top end 632. The base end 631 of the third component 63 is formed as an internally threaded portion, having a recess that extends spirally along the circumference of the third component 63. The base end (internal threaded portion) 631 can engage (screw) with the external threaded portion 627 of the second component 62. The third component 63 is connected to the second component 62 by engaging the base end (internal threaded portion) 631 with the external threaded portion 627.

[0163] When the third component 63 is connected to the second component 62, the portion of the second component 62 that is forward of the external thread portion 627 is positioned within the rear portion of the third component 63. The outer diameter of the portion of the second component 62 that is forward of the external thread portion 627 is smaller than the inner diameter of the rear portion of the third component 63. An annular protrusion 635 protruding radially inward is provided at the rear portion of the third component 63. The protruding end of the protrusion 635 abuts against the outer peripheral surface of the second component 62. Accordingly, the second component 62 is held in a position forward of the engagement portion of the base end (internal thread portion) 631 and the external thread portion 627, and its radial movement relative to the third component 63 is restricted. Therefore, the positional relationship between the second component 62 and the third component 63 is stably maintained.

[0164] The length of the nozzle 6 in the direction of axis A6 (i.e., the length in the direction of air flow) configured as described above can be changed by removing the third component 63 from the second component 62, or by removing the second component 62 and the third component 63 from the first component 61. Therefore, the user can adjust the length of the nozzle 6 according to the actual usage.

[0165] Specifically, for example, when wanting to blow away dust from holes in the floor, the user can use the nozzle 6 with the first component 61, the second component 62, and the third component 63 connected. In this case, the total length of the nozzle 6 is at its maximum, for example, about 70 cm. Therefore, the user can blow air to the desired location with almost no bending over. On the other hand, when wanting to blow air closer to the user, the user can shorten the total length of the nozzle 6 to, for example, about 35 cm by removing only the third component 63. When wanting to blow air even closer to the user, the user can shorten the total length of the nozzle 6 to, for example, about 10 cm by removing both the second component 62 and the third component 63. In this way, the nozzle 6 improves the convenience of the dust blower 8.

[0166] Furthermore, the second component 62 and the third component 63 of the nozzle 6 are connected by screwing. Therefore, air is less likely to leak from the connection between the second component 62 and the third component 63. In addition, even if an external force is applied to the nozzle 6 (especially an axial force that pushes the third component 63 into the second component 62), the positional relationship between the second component 62 and the third component 63 is not easily changed. Therefore, the user can use the nozzle 6 in a stable state.

[0167] Furthermore, the second component 62 is provided with a flexible region 625 (bellows), which is adjacent to the downstream side of the first component 61 in the airflow direction. In this embodiment, the portion of the second component 62 other than the flexible region 625 and the third component 63 have lower rigidity than the first component 61, allowing for slight bending. However, since the flexible region 625 is more prone to bending than other parts of the nozzle 6, even when an external force is applied to the nozzle 6 (especially a force in the direction intersecting axis A6), the bending of the flexible region 625 can reduce the load on other parts. In particular, without the flexible region 625, the second component 62 could potentially break at the boundary between the top of the first component 61 mounted on the blower 8 and the second component 62. The addition of the flexible region 625 effectively reduces this possibility.

[0168] The following shows the correspondence between the constituent elements of the above embodiments and the constituent elements of the present invention. However, the constituent elements of the embodiments are merely examples and do not limit the constituent elements of the present invention.

[0169] The blower 8 is an example of a "blower". Nozzles 1, 4, and 5 are examples of "nozzles". Mounting part 11 is an example of a "mounting part". Holding part 12 and flexible tube 16 are examples of a "body part". Discharge port 162 is an example of a "discharge port". Passage 160 is an example of a "passage". Flexible tube 16 is an example of a "flexible tube". Cover 18 is an example of a "cover". Vent 132 is an example of a "vent". Vent resistance component 125 is an example of a "vent resistance component".

[0170] Nozzle 2 is an example of a "nozzle". Body part 22 is an example of a "body part". Exhaust port 222 is an example of an "exhaust port". Vent 24 is an example of a "vent". Protrusion 280 is an example of a "protrusion". Stop 23 is an example of a "stop".

[0171] Nozzle 3 is an example of a "nozzle". Body part 32 is an example of a "body part". Discharge port 326 is an example of a "discharge port".

[0172] Nozzle 6 is an example of a "nozzle". First component 61, second component 62, and third component 63 are examples of "cylindrical components". First component 61 and second component 62 are examples of "first component" and "second component", respectively. Flexible region 625 is an example of "the portion of the second component that is adjacent to the first component downstream of the first component in the flow direction".

[0173] Furthermore, the above embodiments are merely examples, and the nozzles involved in this invention are not limited to the illustrated nozzles 1 to 6. For example, the following illustrated modifications can be made. In addition, at least one of these modifications can be combined with any of the illustrated nozzles 1 to 6 and any of the inventions described in the various technical solutions.

[0174] For example, in nozzle 1 of the first embodiment, nozzle 4 of the fourth embodiment, and nozzle 5 of the fifth embodiment, the length of the flexible tube 16 does not need to be 70 cm; it can be shortened or lengthened. However, considering the freedom to change the position and orientation of the outlet 162, it is preferable that the length of the flexible tube 16 is at least 15 cm. Furthermore, the diameter of the flexible tube 16 can also be arbitrarily changed. In this case, when the airflow discharged from the outlet 162 of the flexible tube 16 is outside the surge region, it is not necessary to provide a vent 132. The flexible tube 16 can also be formed of a flexible material different from PVC.

[0175] The connection structure between the flexible tube 16 and the base component 10 is not limited to the examples of the above embodiments. For example, the shape, number, and position of the protrusion 174 of the engaging component 17 and the recess 135 of the base component 10 can be appropriately changed. In addition, the number and position of the locking hole 165 of the flexible tube 16 and the locking protrusion 145 of the base component 10 can be appropriately changed. For example, the flexible tube 16 can also be fixed to the mounting portion 11 in a non-removable manner. Furthermore, it is not necessary for the entire passage 160 to be defined (defined) by the flexible tube 16. For example, only a portion of the passage 160 can be defined by the flexible tube 16, while another portion (e.g., the portion near the outlet) can be defined by a component that is not flexible (or has much lower flexibility than the flexible tube 16).

[0176] When vents 132 are provided, their position, number, shape, and area are not limited to the examples of the embodiments described above, and can be arbitrarily determined according to their relationship with the surge region, as mentioned above. For example, the shapes of the multiple vents 132 may also be different from each other. In addition, when the rotational speed of the motor 881 of the blower 8 (the rotational speed of the centrifugal fan 885) is adjustable, there are characteristic curves that differ depending on the rotational speed of the motor 881. Therefore, it is preferable to set the area of ​​the outlet 162 and at least one vent 132 in a way that ensures the total flow outside the surge region regardless of which motor 881 rotational speed is selected within a settable range.

[0177] The ventilation resistance component 125 can be omitted, or its position, number, and shape can be changed. In this case, corresponding to the change of the ventilation resistance component 125, the structure of the ventilation port 132 can be changed according to its relationship with the surge region.

[0178] The position, number, shape, and area of ​​the vent 24 of the nozzle 2 in the second embodiment can also be changed in the same way. However, the vent 24 is configured such that at least a portion of the vent 24 is not blocked by the protrusion 280 when the protrusion 280 is embedded in the passage 220 via the outlet 222. In addition, the nozzle 2 may also have a ventilation resistance component.

[0179] In the third embodiment, the number of outlets 326 of the nozzle 3 can be any number greater than two. Furthermore, the position, shape, and area of ​​the outlets 326 can be appropriately changed. The same applies to the passage 320. For example, the multiple outlets 326 can be arranged circumferentially separated from each other with respect to axis A3. Additionally, the multiple outlets 326 can be connected to multiple separate passages extending from multiple inlets. Furthermore, when the total flow rate of air discharged from the modified multiple outlets 326 is within the surge region, an additional vent can be provided.

[0180] The number of cylindrical components constituting the nozzle 6 in the sixth embodiment can be two or more. The shape, length, and thickness of the first component 61, the second component 62, and the third component 63 can be appropriately varied. Furthermore, for example, the first component 61 and the second component 62 can be connected in a detachable manner by screwing them together. The flexible region 625 does not have to be a bellows, but can be formed of a material (e.g., an elastomer) that is more elastically deformable than other parts of the nozzle 6. Furthermore, if the entire nozzle 6 has a certain degree of flexibility, it is not necessary to provide the flexible region 625.

[0181] The connection structure between nozzles 1-6 and dust blower 8 is not limited to the connection structure consisting of mounting part 11 and locking mechanism 9. For example, nozzles 1-6 and dust blower 8 can also be configured to be able to screw into each other.

[0182] Furthermore, the electrically powered blower capable of mounting nozzles 1 to 6 is not limited to the illustrated dust blower 8. For example, the blower may also be a multi-stage centrifugal blower with multiple centrifugal fans. An axial fan may also be used instead of the centrifugal fan 885. Additionally, the power source for the blower may be a disposable battery or an external AC power source. The motor 881 may be an AC motor or a motor with brushes.

[0183] Furthermore, in view of the spirit of the above embodiments and their variations, the present invention is constructed in the following ways. At least one of the following ways can be used in combination with the above embodiments and their variations, as well as any of the inventions described in the various technical solutions.

[0184] [Method 1] The passage connects the inlet and the outlet, wherein air delivered by the blower flows into the inlet.

[0185] [Method 2] The flexible tube is connected to the mounting part in a state in which it can be pulled out from the mounting part in the opposite direction to the flow direction.

[0186] According to this method, the user can replace the flexible tube as appropriate.

[0187] [Method 3] also includes a locking component mounted on the flexible tube.

[0188] The mounting portion or the main body portion has a recess or a protrusion, wherein the recess is recessed in the flow direction and the protrusion protrudes in the opposite direction of the flow direction, and the engaging member engages with the recess or the protrusion of the mounting portion or the main body portion.

[0189] According to this method, a simple connection structure can be achieved that prevents the flexible tube from detaching in the direction of airflow. The engaging component 17 is an example of an engaging component.

[0190] [Method 4] The engaging component is a cylindrical component with an inner diameter slightly smaller than that of the flexible tube, comprising a first component and a second component joined together in an abutting manner, the first component and the second component engaging with the recess or the protrusion in a clamping state of the flexible tube.

[0191] According to this method, a flexible tube connection structure with excellent assemblability can be achieved. The first component 17A and the second component 17B are examples of "first component" and "second component," respectively. The recess 135 is an example of a "recess."

[0192] [Method 5] The engaging component has at least one protrusion that protrudes radially inward.

[0193] According to this method, the engaging component can more reliably hold the flexible tube. Protrusions 171A and 171B are examples of "protrusions".

[0194] [Method 6] The at least one vent is an opening used to suppress surge.

[0195] According to this method, the diameter of the discharge port can be made smaller according to the desired application.

[0196] [Method 7] The flow rate of the air discharged from the outlet is within the surge region determined by the specifications of the blower, and the flow rate obtained by adding the flow rate of the air discharged from the at least one vent to the flow rate of the air discharged from the outlet is outside the surge region.

[0197] This method can prevent surge.

[0198] [Method 8] The area of ​​the outlet is the area where the flow rate of air discharged from the outlet is within the surge region determined by the specifications of the blower, and the area obtained by adding the area of ​​the at least one vent and the area of ​​the outlet is the area where the total flow rate of air discharged from the outlet and the at least one vent is outside the surge region.

[0199] [Method 9] The main body has at least one ventilation passage connected to the at least one vent.

[0200] Ventilation pathway 130 is an example of a "ventilation pathway".

[0201] [Method 10] The main body includes a first cylindrical portion disposed radially outside the flexible tube, and the at least one ventilation passage is formed between the first cylindrical portion and the flexible tube.

[0202] According to this method, at least one ventilation passage can be reasonably configured. The outer cylinder 13 is an example of a "first cylindrical section".

[0203] [Method 11] The at least one vent includes: an annular first opening formed between one axial end of the first cylindrical portion and the flexible tube; and at least one second opening formed on the side portion of the first cylindrical portion and connected to the annular opening.

[0204] According to this method, a reasonable structure is provided that increases the flow rate of air discharged from at least one vent by increasing the area of ​​at least one vent. Opening 134 is an example of a "first opening". Opening 137 is an example of a "second opening".

[0205] [Method 12] The main body includes a second cylindrical portion, which is disposed radially inside the first cylindrical portion, and the flexible tube is inserted through the second cylindrical portion.

[0206] According to this method, the flexible tube can be stably maintained, and at least one ventilation passage is provided between the flexible tube and the second cylindrical section. The inner tube 14 is an example of the "second cylindrical section".

[0207] [Method 13] The ventilation resistance component is configured to reduce the speed of the air while allowing air to pass through the ventilation resistance component.

[0208] [Method 14] The ventilation resistance component is formed from a continuous bubble structure made of synthetic resin.

[0209] [Method 15] The main body has a passage connected to the inlet and the outlet, and air delivered by the blower flows into the inlet. When the protrusion is inserted into the passage from the outlet, a portion of the at least one vent is not blocked by the protrusion, thereby allowing the interior of the passage to communicate with the exterior.

[0210] According to this method, a structure in which air can reliably flow out from at least one vent can be achieved.

[0211] Pathway 220 and inlet 221 are examples of “pathway” and “inlet”, respectively.

[0212] [Method 16] The flow rate of air discharged from the protrusion to the interior of the object to be supplied via the outlet is within a surge region determined by the specifications of the blower, and the flow rate obtained by adding the flow rate of air discharged from a portion of the at least one vent to the outside of the passage to the flow rate of air discharged from the protrusion to the interior of the object to be supplied via the outlet is outside the surge region.

[0213] [Method 17] The main body has a passage connecting the inlet and the outlet, through which air supplied by the blower flows into the inlet, and a portion of the at least one vent is located on the same side as the mounting portion in the axial direction of the main body relative to the top of the protrusion when the protrusion is inserted into the passage from the outlet.

[0214] [Method 18] The main body has at least one inlet and at least one passage, wherein air delivered by the blower flows into the at least one inlet, and the at least one passage connects the at least one inlet and the plurality of outlets.

[0215] Inlet 325 and passage 320 are examples of “inlet” and “passage”.

[0216] [Method 19] The at least one flow inlet is a single flow inlet.

[0217] The at least one pathway includes: a main pathway connected to the single inlet; and multiple branch pathways branching off from the main pathway and respectively connected to the multiple outlets.

[0218] According to this method, a reasonable path configuration for guiding air to multiple outlets can be achieved. Inlet 325, main path 321, and branch path 322 are examples of “inlet”, “main path”, and “branch path”, respectively.

[0219] [Method 20] The mounting part has a locking piece that can elastically deform.

[0220] It is configured such that, corresponding to the movement of the blower in the first direction, the locking piece abuts against the blower and moves while elastically deforming, and when it reaches a position facing the locking recess provided on the blower, it engages with the locking recess by a restoring force.

[0221] According to this method, the nozzle can be locked through a simple structure.

[0222] [Method 21] The flexible tube has a through hole.

[0223] The mounting portion or the main body portion has a protrusion that protrudes radially inward toward the nozzle and engages with the through hole of the flexible tube.

[0224] According to this method, a connection structure that is easy to assemble without increasing the number of parts can be achieved. The locking hole 165 and the locking protrusion 145 are examples of a "through hole" and a "protrusion," respectively.

[0225] [Method 22] The surface of the protrusion located upstream in the air flow direction is an orthogonal surface that is approximately orthogonal to the axis of the nozzle, and the surface of the protrusion located downstream in the flow direction is a curved surface or an inclined surface.

[0226] According to this method, a simple connection structure can be achieved that makes the flexible tube less likely to detach in the direction of airflow and is easy to assemble.

Claims

1. A nozzle that can be mounted on an electric blower, characterized in that, It has an installation section and a main body section, wherein, The mounting part is configured to be installed on the blower; The main body is connected to the mounting part and has an outlet and a passage, wherein the passage is connected to the outlet, and air delivered by the blower passes through the passage. The main body includes a flexible tube having a length of at least 15 cm and defining at least a portion of the passage. The flexible tube has a through hole. The mounting portion or the main body portion has a protrusion that protrudes radially inward toward the nozzle and engages with the through hole of the flexible tube.

2. The nozzle according to claim 1, characterized in that, The flexible tube is connected to the mounting part in a manner that prevents it from detaching from the mounting part in the direction of airflow.

3. The nozzle according to claim 1 or 2, characterized in that, The nozzle also has a cover that covers at least a portion of the flexible tube. The cover is formed of a material with a higher hardness than the flexible tube and is detachably mounted on the flexible tube.

4. The nozzle according to claim 1 or 2, characterized in that, The main body has at least one vent, which is located radially outside the flexible tube.

5. The nozzle according to claim 4, characterized in that, The airflow rate discharged from the outlet is within the surge region defined by the specifications of the blower. The flow rate obtained by adding the flow rate of air discharged from the at least one vent to the flow rate of air discharged from the outlet is outside the surge region.

6. The nozzle according to claim 4, characterized in that, It also has a ventilation resistance component, which is configured in the ventilation passage leading to the at least one ventilation port.

7. The nozzle according to claim 4, characterized in that, The main body includes a first cylindrical portion disposed radially outside the flexible tube. A ventilation passage leading to the at least one vent is formed between the first cylindrical portion and the flexible tube.

8. The nozzle according to claim 7, characterized in that, The main body includes a second cylindrical portion disposed radially inside the first cylindrical portion, and the flexible tube is inserted through the second cylindrical portion.

9. The nozzle according to claim 1, characterized in that, The mounting part is configured such that when the nozzle moves in a first direction relative to the blower and is positioned in a predetermined mounting position relative to the blower, the nozzle is locked in the mounting position in a manner that prevents it from moving in a second direction opposite to the first direction.

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