JP2014098320A - Blower blast pipe - Google Patents

Abstract

A blower blow pipe capable of improving the work efficiency of a blower is provided.
A blower pipe mounted on an air outlet portion of a blower body includes a first blower pipe member having a first blower passage and a second blower passage having a second blower passage. 2 blower pipe members 22. The opening / closing member 40 provided in the second blower pipe member 22 is provided with a communication hole 42 for adjusting the opening degree of the vent hole provided in the first blower pipe member 21, and the second blower pipe By rotating the member 22, the amount of air blown from the second air passage 36 changes.
[Selection] Figure 3

Description

  The present invention relates to a blower blow pipe that guides blown air discharged from an air outlet of a blower.

  Portable power tools that use an engine or an electric motor as a drive source include a blower, that is, a blower that blows air onto a work object. Used to do work. The blower has a blower case in which a power source and a fan that is rotationally driven by the power source, that is, a blower body, and a blower pipe for guiding air toward a work object at an air outlet portion of the blower body. Is installed.

  Due to the nature of the work, the blower leaves are cleaned with airflow-oriented work represented by blowing up a large amount of fallen leaves, and wind speed represented by removing wet fallen leaves attached to the ground. There is an important work. Conventional portable blowers include a type in which the blower tube is replaced in accordance with work that emphasizes air volume and work that emphasizes wind speed. Further, Patent Document 1 discloses a blower of a type in which a pressurized air adjusting mechanism that adjusts the air volume, air direction, and air pressure of air blown onto a work object is provided at the tip of a blower pipe.

Japanese Utility Model Publication No. 62-34198

  As described in Patent Document 1, when a pressurized air adjusting mechanism is incorporated at the tip of the air blowing tube, not only the structure of the air blowing tube becomes complicated, but also the pressure air at a position away from the blower body. Since the operator has to manually operate the adjustment mechanism, it is necessary to interrupt the operation when operating the air volume and operate the pressurized air adjustment mechanism, resulting in poor work efficiency.

  On the other hand, even in the type that replaces the air duct according to the work object, it is necessary to attach and detach the air duct in order to replace the air duct during the work, which not only lowers the work efficiency but also for replacement. It becomes a factor to lose the blast pipe.

  An object of the present invention is to provide a blower blower pipe capable of improving the work efficiency of the blower.

  The blower blast pipe of the present invention is a blower blast pipe that is mounted on a blower body that houses a fan that is rotationally driven by a power source and that is provided with an air outlet, and is connected to the air outlet. One air passage, a second air passage that communicates with the air outlet and is provided along the first air passage, and either the first air passage or the second air passage. And an air volume adjusting mechanism for changing the air flow rate from the blower body.

  The blower blow pipe of the present invention has a second blower that forms the second blower passage between the first blower pipe member that forms the first blower passage and the first blower pipe member. A pipe member, and the air volume adjusting mechanism changes an air volume of the second air passage. The blower pipe of the blower of the present invention is characterized in that the second blower pipe member is provided with an opening / closing member, and the opening degree of the vent hole provided in the first blower pipe member is changed by the opening / closing member. . The blower pipe of the blower of the present invention has the second blower pipe member mounted on the blower body so as to be rotatable with respect to the first blower pipe member, and an opening / closing provided on the second blower pipe member. The member is provided with a communication hole for changing the opening degree of the vent hole by the rotation of the second blower pipe member.

  The blower blow pipe of the present invention is provided on the second blow pipe member by mounting the second blow pipe member on the blower body so as to be movable in the axial direction along the first blow pipe member. The opening degree of the vent hole is changed by changing the interval between the open / close member and the vent hole. The blower pipe of the blower according to the present invention is characterized in that the vent hole is provided in a tapered portion provided in the first blower pipe member, and the opening / closing member is inclined corresponding to the tapered portion. The blower blow pipe of the present invention is provided with a tapered throttle portion having a small diameter toward the blow opening at the tip of the second blow pipe member, and the air blown from the second blow passage is It is biased toward the air ejected from the first air passage. The blower tube of the blower of the present invention is characterized in that the tip of the first blower tube member protrudes from the tip of the second blower tube member.

  The blower tube has a first blower passage and a second blower passage provided along the first blower passage, and is connected to either the first blower passage or the second blower passage. Since the air volume from the blower body is changed by the air volume adjustment mechanism, the air volume adjustment mechanism causes air to be ejected from the air outlet of one of the air passages, and air is ejected from the air outlets of both air passages. The operation can be switched to the state to be performed without interruption. Since the air volume adjusting mechanism can be operated at a position close to the air outlet of the blower body, the air volume adjusting operation can be easily performed. As described above, since the air volume adjustment operation of the blower can be easily performed, workability of the blower can be improved.

  When the first blower passage and the second blower passage are formed by two blower pipe members having an inner and outer double structure, the second blower passage is directed toward the air ejected from the blower opening of the first blower passage. Air blown out from the blower port is energized, so that the air blown out from both blower ports is prevented from being diffused and can be intensively blown to the work object. Can be improved.

It is a perspective view which shows the blower which has a blast pipe which is one embodiment. FIG. 2 is an enlarged front view of the air duct shown in FIG. 1. It is a longitudinal cross-sectional view of FIG. (A) is the 4A-4A line expanded sectional view of FIG. 3, (B) is the 4B-4B line expanded sectional view of FIG. 4 shows a state in which the air volume is adjusted from the wind speed emphasis position shown in FIG. 4 to the intermediate position, (A) is a sectional view of the same part as FIG. 4 (A), and (B) is FIG. 4 (B). It is sectional drawing of the same part. The state which adjusted the air volume to the air volume importance position is shown, (A) is sectional drawing of the same part as FIG. 4 (A), (B) is sectional drawing of the same part as FIG. 4 (B). is there. It is sectional drawing of the blast pipe front-end | tip part which shows the ventilation state from the blast pipe shown in FIG. It is sectional drawing which shows a part of ventilation tube of a modification. It is sectional drawing which shows the ventilation pipe of another modification. FIG. 10 is a cross-sectional view showing the air duct in a state where the air volume is adjusted from the wind speed emphasis position shown in FIG. 9 to the air volume emphasis position. (A) is the 11A-11A sectional view taken on the line of FIG. 9, (B) is the 11B-11B sectional view taken on the line of FIG. It is a perspective view which shows the blower provided with the conventional ventilation pipe. FIG. 13 is an enlarged front view of the air duct shown in FIG. 12. It is sectional drawing of FIG. It is sectional drawing of the blast pipe front-end | tip part which shows the ventilation state from the blast pipe shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the portable blower 10 has a blower case, that is, a blower main body 11 in which a fan (not shown) and an engine as a power source for rotationally driving the fan are accommodated. When a fan is driven by the engine, external air is sucked by the fan and an air flow, that is, blown air is generated. In order to discharge the generated air flow from the blower body 11, the blower body 11 is provided with an air outlet portion 12. The blower main body 11 is provided with an operation handle 13 held by an operator, and the worker holds the blower 10 at the portion of the operation handle 13 and performs an air blowing operation to the work object. The operation handle 13 is provided with an operation lever 14 for adjusting the engine speed.

  As shown in FIGS. 1 and 2, a blower pipe 20 is attached to the cylindrical joint portion 15 provided in the air outlet portion 12. As shown in FIG. 3, the air duct 20 has a first air duct member 21 as a main air duct and a second air duct member 22 as a sub-air duct having a diameter larger than that of the main air duct. Both of the air pipe members 21 and 22 are attached to the joint portion 15 along the same axis. The two air pipe members 21 and 22 are each formed by a tube or a cylindrical member having a circular cross section, and both ends are opened.

  The first air duct member 21 includes a cylindrical main air passage, that is, a straight portion 24 having a first air passage 23, and a base end portion 26 integrated with the straight portion 24 via a taper portion 25. The first air outlet 27 as a main air outlet is provided at the tip of the straight portion 24, and the base end portion 26 communicates with the air outlet portion 12 of the blower body 11. The base end portion 26 is fitted to the inner surface of the joint portion 15, and as shown in FIGS. 3 and 4B, the base end portion 26 is provided with a claw portion 28 that protrudes radially outward. The inner surface of the joint portion 15 is provided with a concave portion 29 with which the claw portion 28 is engaged. As shown in FIG. 4B, two claw portions 28 are provided with a phase shift of about 180 degrees in the circumferential direction, and two concave portions 29 are also provided corresponding to the claw portions 28. Yes. By engaging the respective claw portions 28 with the recesses 29, the first blower pipe member 21 is fitted and fixed to the inner surface of the joint portion 15. The straight portion 24 has a smaller diameter than the base end portion 26, and the tapered portion 25 is inclined so as to have a smaller diameter from the base end portion 26 toward the straight portion 24.

  The second blower pipe member 22 has substantially the same diameter as a whole, and has a base end portion 31 that is rotatably fitted to the outer surface of the joint portion 15. As shown in FIG. 3, an annular projecting portion 32 is provided on the outer peripheral surface of the joint portion 15, and an annular recessed portion 33 that enters the projecting portion 32 is provided on the base end portion 31. As a result, when a rotational force is applied to the second blower tube member 22, the second blower tube member 22 is guided by the protrusion 32 and reciprocates in a swinging motion, that is, in a fixed rotation range. In order to restrict the rotation range, a claw portion 34 is provided on the inner peripheral surface of the base end portion 31 so as to protrude radially inward as shown in FIG. A groove portion 35 into which is inserted extends in the circumferential direction on the outer peripheral surface of the joint portion 15. Two claw portions 34 are provided with a phase shift of about 180 degrees in the circumferential direction, and two groove portions 35 are also provided corresponding to the claw portions 34. Each groove portion 35 has a length in the circumferential direction corresponding to the rotation angle θ of the second blower tube member 22, and the rotation angle θ of the second blower tube member 22 is about 45 degrees. ing. Stopper surfaces 35a and 35b are provided at both ends of each groove portion 35, and the second blower pipe member 22 is rotatable between both stopper surfaces 35a and 35b.

  As shown in FIG. 3, a cylindrical sub air passage, that is, a second air passage 36 is formed between the second air duct member 22 and the straight portion 24 of the first air duct member 21. The distal end portion of the second blower pipe member 22 is provided with a tapered throttle portion 37 inclined so as to have a small diameter toward the distal end surface, and the distal end of the throttle portion 37 is a second blower port serving as a sub blower port. It becomes the ventilation opening 38. The tip of the first blower tube member 21 protrudes from the tip of the second blower tube member 22, and the second blower port 38 recedes from the first blower port 27, and the second blower port Reference numeral 38 denotes an annular air outlet. Thus, the 2nd ventilation pipe member 22 arrange | positioned on the outer side of the 1st ventilation pipe member 21 is arrange | positioned so that at least one part may be covered, without covering the whole 1st ventilation pipe member 21. .

  As shown in FIG. 3, a tapered opening / closing member 40 that contacts the front surface of the tapered portion 25 of the first blower pipe member 21 protrudes radially inward on the inner surface of the second blower pipe member 22. The opening / closing member 40 is provided integrally with the air blowing tube member 21 in an inclined state. As shown by a broken line in FIG. 4A, the tapered portion 25 is provided with four vent holes 41 with a phase shift of 90 degrees in the circumferential direction. Each vent hole 41 extends in an arc shape in the range of an angle α in the circumferential direction, and the angle α is about 45 degrees. In FIG. 4A, the opening and closing member 40 is provided with four communication holes 42 with a phase shift of about 45 degrees. Each communication hole 42 extends in an arc shape in the circumferential direction in the range of substantially the same angle α as the air hole 41. However, the number of the vent holes 41 and the communication holes 42 is not limited to the illustrated form, and can be an arbitrary number.

  As described above, the air flow adjusting mechanism 39 is configured by the opening / closing member 40 as the air flow adjusting member provided with the communication hole 42 and the tapered portion 25 of the first air duct member 21 provided with the vent hole 41. .

  As shown in FIG. 3, the first air duct member 21 is provided with a tapered portion 25 between the straight portion 24 and the base end portion 26, and a vent hole 41 is provided in the tapered portion 25. The taper portion 25 may be a radial step portion extending in the radial direction, and the vent hole 41 may be provided in the radial step portion. In that case, the opening / closing member 40 is provided on the second air blowing member 22 in the radial direction.

  As shown in FIG. 4, the circumferential position of the second blower pipe member 22 is set so that the vent hole 41 of the taper portion 25 and the communication hole 42 of the opening / closing member 40 are separated in the circumferential direction. When set, the vent hole 41 is closed by the opening / closing member 40, so that the air duct 20 is in the wind speed emphasis position, that is, the wind speed emphasis mode. At this position, since the claw portion 34 is in contact with one stopper surface 35a of the groove portion 35, the air blown into the base end portion 26 from the air outlet portion 12 is as shown by an arrow G in FIG. Then, only the first air passage 23 flows as shown by the arrow M and is ejected from the first air outlet 27. At this time, since the passage area of the first air passage 23 is narrowed through the taper portion 25 rather than the base end portion 26, the air indicated by the arrow M flowing through the first air passage 23 is increased due to an increase in ventilation resistance. Although the air volume decreases, the wind speed increases. By increasing the wind speed, it is possible to perform an operation focusing on the wind speed at a large wind speed.

  On the other hand, when the second air duct member 22 is rotated counterclockwise in FIG. 4A, the air volume adjusting member, that is, the communication hole 42 of the opening / closing member 40 gradually overlaps the vent hole 41 of the taper portion 25. Thus, the opening degree of the vent hole 41 is increased. When the vent hole 41 and the communication hole 42 are overlapped to increase the opening degree of the vent hole 41, a part of the air blown from the air outlet portion 12 becomes the second as shown by the broken line arrow S in FIG. The amount of air flowing into the air passage 36 increases. Thus, when the vent hole 41 is opened, a flow of air that flows through the second air passage 36 and is discharged from the second air outlet 38 is generated, and the air duct 20 is in the air amount emphasis position, that is, the air amount emphasis mode. It becomes.

  FIG. 5A shows a state in which the second blower pipe member 22 has been turned to the middle position of the maximum turning range, and FIG. 6A shows that the second blower pipe member 22 has been turned to the maximum turning range. Indicates the state of movement. When the amount of air flowing through the second air passage 36 increases, the suppression of the passage area by the taper portion 25 is alleviated and the airflow resistance is reduced. Therefore, although the wind speed is reduced, the total air volume ejected from the air duct 20 is increased. In addition, it is possible to perform work with an emphasis on air volume at a large air volume. FIG. 6 (A) shows a state in which the vent hole 41 and the communication hole 42 coincide with each other and the claw portion 34 is in contact with the stopper surface 35b. At this time, the vent hole 41 is fully opened and the total air volume becomes the maximum value. Become.

  When air is ejected from both of the air blowing ports 27 and 38, the air inside the air blown out from the air blowing port 27 in the form of a cylinder is surrounded by the air outside the air blown out from the air blowing port 38 in a cylindrical shape. Since the air is biased so as to cover the air inside, the air ejected from both the air blowing ports 27 and 38 is rectified to prevent the air from diffusing. In particular, when air is ejected from both the air outlets 27 and 38, as shown in FIG. 7, the air ejected from the second air outlet 38 by the throttle 37 becomes a swirl flow V that is engulfed inside. The air ejected in a columnar shape from the air outlet 27 is energized so as to surround the swirl flow V, and the diffusion of the air ejected from both the air outlets 27 and 38 is surely prevented, and the air velocity at a large air volume is obtained. When performing important work, air can be intensively blown toward the work object.

  Since the opening / closing member 40 for adjusting the opening degree of the vent hole 41 of the taper portion 25 is provided on the second blower pipe member 22 arranged outside the first blower pipe member 21, the operator can use the blower body. By operating the base end portion 31 disposed in a portion close to 11, the second blower pipe member 22 can be rotated. As a result, the second blower pipe member 22 can be rotated with the other hand while holding the blower 10 while holding the operation handle 13 with one hand, and the air to the work object Therefore, it is possible to switch between the air speed-oriented work and the air volume-oriented work without interrupting the air blowing work, thereby improving workability.

  As described above, the blower 10 having the blower pipe 20 allows the opening degree of the vent hole 41 to be continuously adjusted by the rotation operation of the second blower pipe member 22 without the operator performing replacement or removal operation of the blower pipe. By adjusting to, the work can be performed while adjusting the air volume and the wind speed steplessly according to the work content. Further, as shown in FIG. 7, during the large air volume work, the air blown from the second blower port 38 is urged by the throttle unit 37 to the air blown from the first blower port 27, and the diffusion of the blown air is prevented. Therefore, the diffusion of the work object can be suppressed, and the work efficiency is dramatically improved.

  FIG. 8 is a cross-sectional view showing a part of a blower tube 20 of a modification. The structure of the first blower pipe member 21 of the blower pipe 20 is the same as that of the blower pipe member 21 described above, and a vent hole 41 (not shown) is provided in the tapered portion 25. The second air duct member 22 is not provided with the opening / closing member 40, and the second air duct member 22 is fixed to the joint portion 15. The opening / closing member 40 is provided at the distal end portion of a cylindrical member 43 that is rotatably mounted inside the proximal end portion 26 of the first air duct member 21, and the opening / closing member 40 is provided on the inner surface of the tapered portion 25. In contact. The opening / closing member 40 is provided with a communication hole 42 as in the case of the opening / closing member 40 shown in FIG. An operation knob 44 is provided at the proximal end portion of the cylindrical member 43 so as to protrude outward in the radial direction of the air outlet portion 12, and the opening / closing member 40 is rotated by the operation knob 44 within a range of about 45 degrees. The

  As described above, even when the opening / closing member 40 is separated from the second blower pipe member 22, it is possible to switch between the air speed-oriented work and the air volume-oriented work by operating the operation knob 44, as described above.

  FIG. 9 is a cross-sectional view showing a blower pipe of another modification, and FIG. 10 is a cross-sectional view showing the blower pipe in a state where the air volume is adjusted from the wind speed priority position shown in FIG. 9 to the air volume priority position. The structure of the first blower pipe member 21 in the blower pipe 20 shown in FIGS. 9 and 10 is the same as that of the blower pipe member 21 shown in FIG. On the other hand, the second blower pipe member 22 is attached to the joint portion 15 of the blower main body 11 so as to be linearly reciprocally movable, that is, translationally movable. To reciprocate the second air duct member 22 in the axial direction, as shown in FIG. 9, the joint portion 15 is provided with a groove portion 45 extending in the axial direction, and a claw portion that engages with the groove portion 45. 46 is provided at the proximal end portion 31 of the second blower pipe member 22. As shown in FIG. 11 (B), two groove portions 45 are provided in the joint portion 15 with a phase shift of 180 degrees in the circumferential direction, and the claw portions 46 correspond to the groove portions 45 in the second direction. Two are provided at the base end portion 31 of the blow pipe member 22. As shown in FIG. 9, when the second blower tube member 22 is moved to the retreat limit position, the claw portion 46 contacts the stopper surface 45 a of the groove portion 45. On the other hand, when the second blower tube member 22 is moved to the forward limit position, the claw portion 46 comes into contact with the stopper surface 45 b of the groove portion 45.

  Unlike the air duct member 22 shown in FIG. 3, the opening / closing member 40 provided in the second air duct member 22 is provided with the communication hole 42 described above, as shown in FIG. Not. As a result, as shown in FIG. 9, when the opening / closing member 40 is moved to the retreat limit position, the opening / closing member 40 contacts the tapered portion 25 and the vent hole 41 is closed. On the other hand, as shown in FIG. 10, when the opening / closing member 40 is moved to the forward limit position, the interval between the opening / closing member 40 and the tapered portion 25 is increased by a predetermined value or more, and the vent hole 41 is fully opened. By adjusting the interval between the second air blowing tube member 22 between FIG. 9 and FIG. 10, the vent hole 41 is adjusted to an arbitrary opening degree between the fully open and fully closed states.

  In this way, also in the embodiment in which the opening / closing member 40 is reciprocated in the axial direction by the second air duct member 22 to adjust the opening degree of the air vent 41, the opening / closing member 40 is moved to the second position as shown in FIG. You may make it isolate | separate from this air duct member 22. In that case, the cylindrical member 43 shown in FIG. 8 is reciprocated in the axial direction, and the opening / closing member 40 is provided on the cylindrical member 43.

  FIG. 12 is a perspective view showing a blower provided with a conventional blower tube. 13 is an enlarged front view of the blower pipe shown in FIG. 12, and FIG. 14 is a cross-sectional view of FIG. FIG. 15 is a cross-sectional view of the front end portion of the air pipe showing the air blowing state from the air vent of the air pipe shown in FIG.

  The conventional blower pipe 50 has a proximal blower pipe 51 fixed to the air outlet portion 12 of the blower body 11 and a distal blower pipe 52 detachably attached to the distal end. It has a connected structure. The distal end portion of the distal air blower tube 52 has a tapered shape with a diameter that decreases toward the air blowing port 53, and the diameter of the air blowing port 53 is smaller than the diameter of the air blowing port 54 of the proximal air blower tube 51. It has become. When performing work with an emphasis on the air volume, the operator removes the front-end side blower pipe 52 from the proximal-end side blower pipe 51 and causes air to be ejected from the blower opening 54 having a larger area than the blower opening 53. On the other hand, when working with an emphasis on wind speed, the front-end side blower tube 52 is attached and air is blown out from the blower port 53. At this time, since the area of the air blowing port 53 is smaller than that of the air blowing port 54, the wind speed increases as compared with the case where the air volume is emphasized.

  However, as shown in FIGS. 12 to 14, if the blower pipe has a two-stage connection structure, the work is interrupted and the blower pipe is attached / detached in order to switch between the air volume-oriented work and the wind speed-oriented work during the work. Not only cannot increase the work efficiency, but also cause a loss of the front-end air blower tube 52. Further, since there is one air passage, as shown in FIG. 15, the air ejected from the air outlet 54 is diffused by the surrounding air resistance. For this reason, work objects such as fallen leaves are blown away in a direction in which the work object is diffused, and this is a factor that lowers work efficiency particularly when working with a large air volume. In addition, the tip-side blast pipe 52 is away from the blower body 11 and cannot be easily attached or detached.

  On the other hand, in the air duct 20 of each form mentioned above, the opening degree of the air vent 41 by the rotation operation of the second air duct member 22 or the like without the operator performing replacement or removal operation of the air duct. By adjusting steplessly, the work can be performed while adjusting the air volume and the wind speed steplessly according to the work content. This adjustment work can be performed without interrupting the air blowing work on the work object under the state where the blower 10 is gripped, and the workability can be improved. In addition, when working with a large amount of air blown from both the air blowing ports 27 and 38, the air blown from the air blowing port 27 is urged so as to surround the air blown from the air blowing port 38, so that the diffusion of the blown air is prevented. Thus, air can be sprayed intensively on the work object. Thereby, spreading | diffusion of a work target object can be suppressed and work efficiency can be improved greatly.

  In the embodiment described above, the air flow rate of the outer second air passage 36 is changed, but the air flow rate of the inner first air passage 23 may be changed. Moreover, in embodiment mentioned above, the 1st ventilation pipe member 21 and the 2nd ventilation pipe member 22 are made into the inside-and-outside double pipe structure, and the 2nd ventilation path 36 is outside the 1st ventilation path 23. Although formed, two air pipe members having a semicircular cross section may be arranged in parallel.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, an engine as a drive source is incorporated in the blower body 11 shown in FIG. 1, but a blower having an electric motor mounted as a drive source may be used.

DESCRIPTION OF SYMBOLS 10 ... Blower, 11 ... Blower main body, 12 ... Air outlet part, 13 ... Operation handle, 14 ... Operation lever, 15 ... Joint part, 20 ... Blower pipe, 21 ... 1st ventilation pipe member, 22 ... 2nd ventilation Tube member, 23 ... first air passage, 24 ... straight portion, 25 ... tapered portion, 26 ... base end portion, 27 ... first air outlet, 28 ... claw portion, 29 ... concave portion, 31 ... base end portion, 32 ... Projection part, 33 ... Recessed part, 34 ... Claw part, 35 ... Groove part, 36 ... Second air passage, 37 ... Throttle part, 38 ... Second air outlet, 39 ... Air volume adjusting mechanism, 40 ... Opening / closing member, 41 ... vent hole, 42 ... communication hole, 43 ... cylindrical member, 44 ... operation knob, 45 ... groove part, 46 ... claw part.

Claims (8)

A blower blower tube that houses a fan that is rotationally driven by a power source and is attached to a blower body provided with an air outlet,
A first air passage communicating with the air outlet portion;
A second air passage that communicates with the air outlet and is provided along the first air passage;
A blower blower tube, comprising: an air volume adjusting mechanism that changes an air flow rate from the blower body to one of the first blower passage and the second blower passage.   A first air duct member that forms the first air passage, and a second air duct member that forms the second air passage between the first air duct member and the air volume. The blower blower pipe according to claim 1, wherein the adjustment mechanism changes an air volume of the second blower passage.   The blower blow pipe according to claim 2, wherein an opening / closing member is provided in the second blow pipe member, and an opening degree of a vent hole provided in the first blow pipe member is changed by the opening / closing member. .   The second blower pipe member is mounted on the blower main body so as to be rotatable with respect to the first blower pipe member, and the second blower pipe is attached to an opening / closing member provided on the second blower pipe member. The blower blow pipe according to claim 2 or 3, wherein a communication hole is provided for changing an opening degree of the vent hole by rotation of a member.   The second blower pipe member is attached to the blower body so as to be axially movable along the first blower pipe member, and an opening / closing member provided on the second blower pipe member and the vent hole The blower blower pipe according to claim 2 or 3, wherein the opening of the vent hole is changed by changing the interval.   The said ventilation hole is provided in the taper part provided in the said 1st ventilation pipe member, The said opening-and-closing member is made to incline corresponding to the said taper part, The any one of Claims 2-5 characterized by the above-mentioned. Blower air duct.   A tapered throttle portion having a small diameter toward the blower opening is provided at the tip of the second blower pipe member, and the air blown from the second blower passage is blown from the first blower passage. The blower blow pipe according to any one of claims 2 to 6, wherein the blower is urged toward the fan.   The blower blow pipe according to any one of claims 2 to 7, wherein a tip of the first blow pipe member is protruded from a tip of the second blow pipe member.

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