JP2017008685A - Injection pipe for blower - Google Patents

Abstract

A jet tube capable of stably adjusting the blowing direction of an air flow, suppressing pressure loss of the air flow, and further improving durability.
An injection tube connected to a blower outlet of a blower, and includes a straight portion and an inclined portion connected to the straight portion. The inclined portion 30 includes an inner tube 40 and an outer tube 50 that is externally fitted to the inner tube 40. The inner tube 40 and the outer tube 50 each have a curved portion at least one thereof, and the inner tube 40 and the outer tube 50 are relatively slidable in the axial direction of the inclined portion 30. Depending on the sliding amount of the inner tube 40 and the outer tube 50, the blowing direction of the air flow changes. The outer tube 50 may be externally fitted to the tip side of the inner tube 40.
[Selection] Figure 2

Description

  The present invention relates to a blower tube.

A blower (power blower) for cleaning fallen leaves and dust using a high-speed air flow is connected to a jet tube for blowing the air flow to a desired position.
In the above-described blower, it is desired to blow an air flow along the ground in operations such as removing fallen leaves attached to the ground wet with rain or the like or cleaning an inclined surface.
Therefore, there is a blower that is configured to be tiltable at the tip of the jet tube and adjust the blowing direction of the air flow according to the work application (see, for example, Patent Document 1).

US Patent Application Publication No. 2013/0298351

In the above-described conventional jet tube, the tip portion can be set at a desired angle, but the tip portion bends at a steep angle, so that when the air flow hits the inner peripheral surface of the tip portion of the jet tube The bending angle of the air flow increases. Therefore, the above-described conventional jet tube has a problem that the tip of the jet tube is pushed down by the air flow and the pressure loss of the air flow becomes large.
Moreover, in the above-mentioned conventional jet tube, since the tip portion is configured to locally receive the pressure of the air flow, there is a problem that durability of the jet tube is lowered.

  The present invention solves the above-described problems, can stably adjust the blowing direction of the air flow, can suppress the pressure loss of the air flow, and can further enhance the durability. It is an issue to provide.

  In order to solve the above problems, the present invention is a jet tube connected to a blower outlet of a blower, and includes a straight portion and an inclined portion connected to the straight portion. The inclined portion includes an inner tube and an outer tube fitted on the inner tube. The inner tube and the outer tube each include a curved portion at least one thereof, and the inner tube and the outer tube are relatively slidable in the axial direction of the inclined portion. An air flow blowing direction is changed in accordance with the sliding amount of the inner pipe and the outer pipe.

  In the jet tube of the present invention, when the inner tube and the outer tube are slid relative to each other in the axial direction of the inclined portion and the inclined portion is expanded and contracted, the distal end portion of the jet tube moves in a curved line. As described above, in the injection tube of the present invention, the inner tube and the outer tube are relatively slid to adjust the blowing direction of the air flow according to the sliding amount, and the axial length of the injection tube. Can be adjusted.

  In the jet tube of the present invention, since the flow path in the inclined portion bends gently, the air flow smoothly flows in the inclined portion. Thereby, the pressure of the airflow which acts on the internal peripheral surface of an inclination part can be suppressed, and durability of a jet tube can be improved. Moreover, the pressure loss of the airflow when the airflow passes through the inclined portion can be suppressed.

  The inclined portion of the present invention has a double-pipe structure in which an inner tube and an outer tube are stacked on the inside and outside, and the structure of the inclined portion is a relatively simple structure, so that the manufacturing cost of the injection tube can be reduced. .

  In the above-described blower jet tube, when the outer tube is externally fitted to the distal end portion of the inner tube, the air flow flows from the smaller inner tube to the larger outer tube. The air flow can be smoothly passed through the boundary with the tube, and the pressure loss of the air flow can be suppressed.

  In the above-described blower jet tube, when the fitting portion of the inner tube and the outer tube is curved with the same curvature, the inner tube and the outer tube can be slid relatively smoothly. Moreover, in this structure, since an air flow passes smoothly through the inside of an inclined part, the pressure loss of an air flow can be suppressed.

In the above-described blower tube, a guide groove extending in the axial direction of the inclined portion is formed on the outer peripheral surface of the inner tube, and inserted into the guide groove on the inner peripheral surface of the outer tube. It is desirable to form protrusions to be formed.
In this configuration, when the inner tube and the outer tube are relatively slid, the projection of the outer tube moves in the guide groove of the inner tube in the axial direction of the inclined portion. Can be prevented from rotating in the radial direction. That is, the guide groove functions as a detent for the inner tube and the outer tube.

In the above-described blower jet tube, it is desirable to form a retaining portion extending in the radial direction of the inner tube in the guide groove.
In this configuration, when the inner tube and the outer tube are slid relative to each other in the axial direction of the inclined portion, the protruding portion of the outer tube contacts the retaining portion of the guide groove. The inner tube and the outer tube can be prevented from accidentally falling off.

  In the above-described blower tube, when the plurality of recesses are arranged in the guide groove in the axial direction of the inclined portion so that the protrusion engages with the recess, the protrusion is the recess. By engaging with the inner tube and the outer tube, the inner tube and the outer tube can be positioned in the axial direction of the inclined portion, and the tip portion of the injection tube can be set at a desired angle.

In the above-described blower tube, a fixing ring that is externally fitted to the outer tube is provided, and the outer tube and the inner tube are fixed to a predetermined slide position by the fixing ring. Also good.
In this configuration, the outer tube and the inner tube are fixed at a predetermined slide position by the fixing ring, and the sliding amount of the outer tube and the inner tube is set so that the tip of the injection tube can be easily set to a desired angle. can do.

  In the above-described blower tube, the inner peripheral surface of the fixing ring is reduced in diameter at the other end rather than at one end, and the inner diameter at the other end of the fixing ring is smaller than the outer diameter of the outer tube. It may be formed.

  In this configuration, when the fixing ring is fitted to the outer tube from one end side, the outer wall of the outer tube is pushed in by the inner peripheral surface of the other end of the fixing ring, and the outer tube is reduced in diameter. . Thereby, since the outer peripheral surface of an inner tube and the inner peripheral surface of an outer tube are press-contacted, an inner tube and an outer tube can be fixed.

  In the above-described blower injection tube, when the inner peripheral surface of the fixing ring is screwed to the outer peripheral surface of the outer tube, the fixing ring is tightened with respect to the outer tube, The outer tube can be fixed.

  In the jet tube of the present invention, it is necessary to prepare a plurality of jet tubes having different air flow blowing directions because the blowing direction of the air flow can be stably adjusted according to the work application or the operator's request. Disappear. And in the jet tube of this invention, an operator can change the blowing direction of an airflow easily according to work environments, such as a wet ground and a mountainous area with a large topographic change. Moreover, in the injection tube of this invention, while being able to suppress the pressure loss of an airflow, manufacturing cost can be reduced.

It is the side view which showed the blower using the jet tube which concerns on embodiment of this invention. It is a side view of the state where the inclined part concerning the embodiment of the present invention was contracted. It is the figure which showed the inclination part which concerns on embodiment of this invention, (a) is a side view of an inner tube, (b) is a sectional side view of an inner tube. It is the figure which showed the inclination part which concerns on embodiment of this invention, (a) is a side view of an outer tube, (b) is a sectional side view of a fixing ring. It is a side view of the state where the inclined part concerning the embodiment of the present invention was extended. It is the figure which showed the procedure which removes an outer pipe | tube from an inner pipe | tube in the inclination part which concerns on embodiment of this invention, (a) is a side view in the state which the protrusion part contact | abutted to the retaining part, (b) is an outer pipe | tube. The side view of the state rotated, (c) is the side view of the state which removed the outer tube from the inner tube.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the injection tube 10 of the present embodiment is connected to a blower 1 (power blower). The blower 1 according to the present embodiment can be transported in a state in which the operator carries the back by being mounted on the back frame 2.

The blower 1 includes a fan case 3 in which a fan (not shown) is accommodated, and an engine 4 that rotates the fan. The blower 1 generates an air flow in the fan case 3 by rotating the fan in the fan case 3. In the blower 1, the air flow is discharged to the outside through the blower pipe 5 and the jet pipe 10 connected to the fan case 3.
The operator can blow off fallen leaves and dust by holding the operation lever 11 of the tube 10 while carrying the blower 1 and blowing a high-speed air flow from the tip of the tube 10 to the ground.

  The base end portion of the blow-out pipe 5 is detachably connected to the blow-out port 3 a of the fan case 3, and the jet pipe 10 is connected to the tip end portion of the blow-out pipe 5. A bellows portion 5a that can be bent in the radial direction is formed at an intermediate portion of the blowing pipe 5.

The injection tube 10 includes a straight portion 20 connected to the distal end portion of the blowing tube 5 and an inclined portion 30 connected to the distal end portion of the straight portion 20.
The straight line part 20 is a cylindrical member extended in a straight line. The base end portion 22 of the straight line portion 20 is detachably connected to the distal end portion of the blowing pipe 5.

The inclination part 30 is a site | part for adjusting the blowing direction (blowing angle) of the airflow which blows off from the jet tube 10 (refer FIG. 1).
As shown in FIG. 2, the inclined portion 30 includes an inner tube 40, an outer tube 50 that is externally fitted to the inner tube 40, and a fixing ring 60 that is externally fitted to the outer tube 50.

The inner tube 40 is a cylindrical member as shown in FIG. A portion closer to the base end portion 42 than approximately half of the inner tube 40 in the axial direction is formed in a straight line. As shown in FIG. 2, the proximal end portion 42 of the inner tube 40 is externally fitted to the distal end portion 21 of the linear portion 20.
Further, as shown in FIG. 3A, a curved portion that is gently curved with a constant curvature is formed in a portion closer to the distal end portion 41 than approximately half of the inner tube 40 in the axial direction.

As shown in FIGS. 3A and 3B, left and right guide grooves 45, 45 are formed on the left and right sides of the outer peripheral surface of the inner tube 40.
In the guide groove 45, a guide portion 45a extending in the axial direction of the inner tube 40 (inclined portion 30) is formed. The guide groove 45 includes a retaining portion 45b extending in the radial direction of the inner tube 40 from the distal end portion of the guide portion 45a, and the inner tube 40 extending from the retaining portion 45b to the distal end opening portion 41a of the inner tube 40. An in / out portion 45c extending in the axial direction is formed.

The guide portion 45a is curved along the curvature of the portion of the inner tube 40 on the distal end portion 41 side. The distal end portion of the guide portion 45 a is disposed in the vicinity of the distal end opening portion 41 a of the inner tube 40, and the proximal end portion of the guide portion 45 a is disposed at a substantially central portion in the axial direction of the inner tube 40.
The guide portions 45a and 45a of the left and right guide grooves 45 and 45 are formed symmetrically and are formed in the center portion of the inner tube 40 in the height direction.

At the tip end portion of the guide groove 45, a retaining portion 45b and an entrance / exit portion 45c are formed continuously to the guide portion 45a.
In the right guide groove 45 shown in FIG. 3A, a retaining portion 45b extends downward from the tip portion of the guide portion 45a, and enters and exits from the lower end portion of the retaining portion 45b to the tip opening 41a. A portion 45c is formed. Thus, the tip of the guide groove 45 is bent in a crank shape.
Further, in the left guide groove 45 shown in FIG. 3B, a retaining portion 45b extends upward from the tip portion of the guide portion 45a, and extends from the upper end portion of the retaining portion 45b to the tip opening portion 41a. The entrance / exit part 45c is formed.

  On the bottom surface of the guide portion 45a, a plurality of concave portions 45d and 45e are arranged in parallel in the axial direction of the guide portion 45a (inclined portion 30) from the distal end portion to the proximal end portion. Of the plurality of recesses 45d and 45e, the recess 45e closest to the base end (left side in FIG. 3) is formed in an oval shape that is wide in the axial direction, and the other recesses 45d are formed in a circle.

As shown in FIG. 4A, the outer tube 50 is a cylindrical member that is gently curved with a constant curvature, and a curved portion is formed in the entire outer tube 50. As shown in FIG. 2, the outer tube 50 is curved with the same curvature as the portion of the inner tube 40 on the distal end 41 side.
The outer tube 50 is externally fitted to a portion of the inner tube 40 on the distal end 41 side. The length of the outer tube 50 in the axial direction is approximately half of the length of the inner tube 40 in the axial direction.
In a state where the outer tube 50 is covered to the most proximal side with respect to the inner tube 40 (the state shown in FIG. 2), the distal end portion 51 of the outer tube 50 is disposed on the distal end side with respect to the distal end portion 41 of the inner tube 40. . A distal end opening 51 a serving as an air outlet is opened at the distal end 51 of the outer tube 50.

Since the outer tube 50 is curved with the same curvature as the portion of the inner tube 40 on the distal end portion 41 side, the outer tube 50 can be smoothly slid relative to the inner tube 40 in the axial direction of the inclined portion 30. And the inclination part 30 can be expanded-contracted to an axial direction by sliding the outer pipe | tube 50 with respect to the inner pipe | tube 40 (refer FIG. 2 and FIG. 5).
As shown in FIG. 2, when the inclined portion 30 is extended from the contracted state, the outer tube 50 is slid toward the distal end side of the jet tube 10 with respect to the inner tube 40 as shown in FIG. 5. . Further, when the inclined portion 30 is contracted from the extended state, the outer tube 50 is slid toward the proximal end side of the injection tube 10 with respect to the inner tube 40 as shown in FIG.

Left and right projections 53, 53 projecting in the radial direction are formed on the left and right side portions of the inner peripheral surface of the outer tube 50. The distal ends of the left and right protrusions 53 and 53 are inserted into the left and right guide grooves 45 and 45 of the inner tube 40, respectively.
The protrusion 53 is a cylindrical portion in which the peripheral wall of the outer tube 50 protrudes inward. The protrusion amount of the protrusion 53 is set so that the tip of the protrusion 53 is pressed against the bottom surface of the guide groove 45.

  When the outer tube 50 is slid in the axial direction with respect to the inner tube 40, the protrusion 53 moves in the guide groove 45 in the axial direction of the inclined portion 30 (see FIG. 5). When the protrusion 53 moves onto the recesses 45d and 45e, the tip of the protrusion 53 is inserted into the recesses 45d and 45e, and the protrusion 53 engages with the recesses 45d and 45e. Thereby, the outer tube 50 is positioned with respect to the inner tube 40.

  As shown in FIG. 6A, when the outer tube 50 is slid in the axial direction toward the distal end side with respect to the inner tube 40, the projection 53 moves to the corner between the guide portion 45a and the retaining portion 45b. The protrusion 53 abuts against the inner surface of the retaining portion 45b, and the movement of the outer tube 50 toward the distal end is restricted. Thereby, it is possible to prevent the outer tube 50 from inadvertently falling off from the distal end portion 41 of the inner tube 40.

When the outer tube 50 is removed from the inner tube 40, as shown in FIG. 6B, the protrusion 53 is moved to the corner between the guide portion 45a and the retaining portion 45b. In this state, the outer tube 50 is rotated with respect to the inner tube 40, and the protrusion 53 is moved toward the entrance / exit 45c in the retaining portion 45b.
And the protrusion part 53 is arrange | positioned at the corner | angular part of the retaining part 45b and the entrance / exit part 45c. Thereafter, as shown in FIG. 6 (c), the outer tube 50 is slid toward the distal end side with respect to the inner tube 40, and the protrusion 53 is moved toward the distal end within the entrance / exit portion 45c, thereby protruding from the guide groove 45. The part 53 is detached. In this way, the outer tube 50 is removed from the inner tube 40.

  As shown in FIG. 4A, a male thread portion 54 is formed on the outer peripheral surface of the base end portion 52 of the outer tube 50. In addition, slits 55 are formed in the left and right side portions of the base end portion 52 of the outer tube 50 so as to be cut in the axial direction from the opening edge portion on the base end portion 52 side of the outer tube 50.

As shown in FIG. 2, the fixing ring 60 is a cylindrical member that is externally fitted to the proximal end portion 52 of the outer tube 50. The fixing ring 60 is a member for fixing the outer tube 50 to the inner tube 40.
As shown in FIG. 4B, the inner peripheral surface 60 a of the fixing ring 60 is formed in a tapered shape that gradually decreases in diameter from the distal end portion 61 toward the proximal end portion 62.
The inner diameter of the distal end portion 61 of the fixing ring 60 is substantially the same as the outer diameter of the outer tube 50, and the inner diameter of the proximal end portion 62 of the fixing ring 60 is slightly smaller than the outer diameter of the outer tube 50. Has been.

  A female screw portion 64 is formed on the inner peripheral surface 60 a of the fixing ring 60. The female thread portion 64 of the fixing ring 60 is screwed into the male thread portion 54 (see FIG. 4A) of the outer tube 50.

When the outer tube 50 is fixed to the inner tube 40 by the fixing ring 60, as shown in FIG. 2, the outer tube 50 is externally fitted to the inner tube 40 and the base end 52 of the outer tube 50 is fitted. On the other hand, the distal end portion 61 of the fixing ring 60 is fitted from the proximal end side of the outer tube 50.
Then, the internal thread portion 64 (see FIG. 4B) of the fixing ring 60 is screwed into the external thread portion 54 (see FIG. 4A) of the outer tube 50, and the external thread portion 54 is tightened into the internal thread portion 64. Then, the fixing ring 60 is moved toward the tip side.
At this time, since the inner peripheral surface 60a (see FIG. 4B) of the fixing ring 60 is reduced in diameter from the distal end portion 61 toward the proximal end portion 62, the fixing ring 60 advances toward the distal end side. The peripheral wall of the outer tube 50 is pushed inward by the inner peripheral surface 60 a of the fixing ring 60.
As a result, the base end portion 52 of the outer tube 50 is reduced in diameter, the inner peripheral surface of the outer tube 50 is in pressure contact with the outer peripheral surface of the inner tube 40, and the outer tube 50 is fixed to the inner tube 40.

  In the above-described jet tube 10, as shown in FIG. 2, the inner tube 40 is slid relative to the axial direction of the inclined portion 30, and the inclined portion 30 is expanded and contracted to thereby base the tip portion of the jet tube 10. The curve can be moved with respect to the end (see FIG. 5).

  In the injection tube 10 of the present embodiment, as shown in FIG. 2, in the state where the inclined portion 30 is most contracted, the axis B of the outer tube 50 is inclined upward by 8 degrees with respect to the axis A of the straight portion 20. ing. That is, the opening direction of the distal end opening 51a of the outer tube 50 is inclined 8 degrees obliquely upward with respect to the axial direction of the straight portion 20.

  Further, in the injection tube 10 of the present embodiment, as shown in FIG. 5, in the state where the inclined portion 30 is most extended, the axis B of the outer tube 50 is 14 degrees obliquely upward with respect to the axis A of the straight portion 20. Inclined. That is, the opening direction of the distal end opening 51a of the outer tube 50 is inclined 14 degrees obliquely upward with respect to the axial direction of the straight line portion 20.

As described above, in the injection tube 10, as shown in FIG. 2, the inner tube 40 and the outer tube 50 are relatively slid to adjust the blowing direction (blowing angle) of the air flow according to the sliding amount. In addition, the axial length of the injection tube 10 can be adjusted.
Therefore, in the injection tube 10 of this embodiment, since the blowing direction of an air flow can be stably adjusted according to a work use or an operator's request, a plurality of injection tubes having different blowing directions of the air flow are provided. No need to prepare. And in the jet tube 10 of this embodiment, an operator can change the blowing direction of an airflow easily according to work environments, such as a wet ground or a mountainous area with a large terrain change.

The guide groove 45 of the inner tube 40 is provided with recesses 45d and 45e at a predetermined pitch. The recesses 45d and 45e serve as a guide for the amount of change in the air flow blowing direction. In the present embodiment, in the state in which the protrusion 53 is engaged with the recess 45e on the most proximal side, the air flow blowing angle is a minimum of 8 degrees. Further, as shown in FIG. 5, in the state where the protrusion 53 is engaged with the recess 45 d on the most distal side, the air flow blowing angle is a maximum of 14 degrees.
In the present embodiment, as shown in FIG. 2, six recesses 45d and 45e are provided in the guide groove 45 at a predetermined pitch, and each time the protrusion 53 moves in the adjacent recesses 45d and 45e, The blowing angle of the air flow is configured to change by about 1 degree.

  In addition, in the injection tube 10 of this embodiment, since the fitting part of the inner tube 40 and the outer tube 50 is curved with the same curvature, the inner tube 40 and the outer tube 50 can be slid relatively smoothly. .

In the injection tube 10 of the present embodiment, the inner tube 40 and the outer tube 50 are gently curved, and the flow path in the inclined portion 30 is gently curved, so that the air flow smoothly in the inclined portion 30. Circulate.
Further, in the jet tube 10 of the present embodiment, since the air flow flows from the small diameter inner tube 40 to the large diameter outer tube 50, the air flow is smoothly passed through the boundary portion between the inner tube 40 and the outer tube 50. Can do.
Therefore, in the jet tube 10 of this embodiment, the pressure of the airflow which acts on the internal peripheral surface (especially inflection point) of the inclination part 30 can be suppressed, and durability of the jet tube 10 can be improved. . Moreover, the pressure loss of an air flow when an air flow passes the inclination part 30 can be suppressed.

  In the injection tube 10 of the present embodiment, the inclined portion 30 has a double tube structure in which the inner tube 40 and the outer tube 50 are stacked on the inside and the outside, and the structure of the inclined portion 30 is a relatively simple structure. 10 manufacturing costs can be reduced.

  In the injection tube 10 of the present embodiment, as shown in FIGS. 2 and 5, when the outer tube 50 is slid with respect to the inner tube 40, the protruding portion 53 of the outer tube 50 has the guide groove 45 of the inner tube 40. The inside moves in the axial direction of the inclined portion 30. Accordingly, the outer tube 50 can be prevented from rotating in the radial direction with respect to the inner tube 40, and the outer tube 50 can be smoothly slid with respect to the inner tube 40. That is, the guide groove 45 has a function as a detent for the inner tube 40 and the outer tube 50.

  Further, when the outer tube 50 is slid with respect to the inner tube 40, the protrusion 53 of the outer tube 50 engages with the recesses 45d and 45e of the guide groove 45 as shown in FIG. The outer tube 50 is axially positioned with respect to 40. Thus, by fixing the slide position of the outer tube 50 with respect to the inner tube 40, the tip opening 51a of the injection tube 10 can be set to a desired angle.

  Further, when the outer tube 50 is slid with respect to the inner tube 40, the protrusion 53 of the outer tube 50 comes into contact with the inner surface of the retaining portion 45b of the guide groove 45 as shown in FIG. Thus, the sliding amount of the outer tube 50 with respect to the inner tube 40 is limited. Thereby, it is possible to prevent the outer tube 50 from being accidentally dropped from the inner tube 40.

  In the injection tube 10 of the present embodiment, as shown in FIG. 2, when the fixing ring 60 is tightened into the proximal end portion 52 of the outer tube 50, the inner peripheral surface 60a of the fixing ring 60 (FIG. 4B). )), The peripheral wall of the outer tube 50 is pushed inward, and the proximal end portion 52 of the outer tube 50 is reduced in diameter. Thereby, since the inner peripheral surface of the outer tube 50 is pressed against the outer peripheral surface of the inner tube 40, the outer tube 50 can be fixed to the inner tube 40.

  In the inclined portion 30 of the present embodiment, a slit 55 (see FIG. 4A) is formed in the proximal end portion 52 of the outer tube 50, and the peripheral wall of the proximal end portion 52 of the outer tube 50 is in the radial direction. It is easy to bend. Therefore, when the fixing ring 60 is attached to the outer tube 50, the proximal end portion 52 of the outer tube 50 can be reliably reduced in diameter.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning, it can change suitably.
In the inclined portion 30 of the present embodiment, as shown in FIG. 2, the inner tube 40 and the outer tube 50 are formed with curved portions having the same curvature, but the inner tube 40 and the outer tube 50 have different curvatures. You may form the curved part curved by. Further, the curvature of the curved portions of the inner tube 40 and the outer tube 50 may be changed in the middle of the inclined portion 30 in the axial direction. Further, a curved portion may be formed in one of the inner tube 40 and the outer tube 50, and the other of the inner tube 40 and the outer tube 50 may be formed in a shape bent at an inflection point.

  In the inclined portion 30 of the present embodiment, as shown in FIG. 1, the inner tube 40 is disposed on the proximal end side of the injection tube 10 and the outer tube 50 is disposed on the distal end side of the injection tube 10. The outer tube 50 may be disposed on the proximal end side of the tenth, and the inner tube 40 may be disposed on the distal end side of the jet tube 10.

  In the present embodiment, as shown in FIG. 2, the inclined portion 30 is configured by two cylindrical bodies of the inner tube 40 and the outer tube 50, but the inclined portion is configured by fitting three or more cylindrical bodies together. May be.

  In the present embodiment, as shown in FIG. 1, the inclined portion 30 is provided at the distal end portion of the injection tube 10, but the inclined portion 30 may be provided at an intermediate portion or a proximal end portion of the injection tube 10. Furthermore, you may comprise so that the blowing direction of an airflow may be changed in steps by providing the inclined part 30 in the jet tube 10, and extending each inclined part 30, respectively.

In this embodiment, as shown in FIGS. 3A and 3B, a pair of left and right guide grooves 45, 45 are formed in the inner tube 40, but a pair of upper and lower guide grooves 45, 45 are formed in the inner tube 40. May be formed.
The number of guide grooves 45 formed in the inner tube 40 is not limited, and one or three or more guide grooves 45 may be formed in the inner tube 40.
Further, the shape of the guide groove 45 is not limited, and may be, for example, a straight line, a curved line, or a curved line meandering into an S shape.

In the present embodiment, as shown in FIG. 1, the case where the jet tube of the present invention is applied to a shoulder-type blower 1 has been described, but the jet tube of the present invention can also be applied to a hand-held blower.
Moreover, the structure of the blower which can apply the jet tube of this invention is not limited. For example, the jet tube of the present invention can be applied to various blowers (power blowers) such as a mist blower for spraying a chemical solution and a spreader for spraying particulate matter.

DESCRIPTION OF SYMBOLS 1 Blower 3 Fan case 3a Outlet 4 Engine 5 Outlet pipe 10 Injector pipe 20 Straight line part 30 Inclined part 40 Inner pipe | tube 41a Tip opening part 45 Guide groove 45a Guide part 45b Detachment part 45c Outlet part 45d, 45e Concave part 50 Outer pipe 51a Tip opening 53 Projection 54 Male thread 55 Slit 60 Fixing ring 60a Inner peripheral surface 64 Female thread

Claims (9)

A jet tube connected to the blower outlet,
A straight portion and an inclined portion connected to the straight portion;
The inclined portion includes an inner tube and an outer tube fitted on the inner tube,
The inner tube and the outer tube each include a curved portion on at least one of the inner tube and the outer tube;
The inner tube and the outer tube are relatively slidable in the axial direction of the inclined portion,
A blower jet tube, wherein a blow direction of an air flow changes according to a sliding amount of the inner tube and the outer tube.   The blower jet tube according to claim 1, wherein the outer tube is externally fitted to a distal end side portion of the inner tube.   The blow tube for a blower according to claim 1 or 2, wherein a fitting portion of the inner tube and the outer tube is curved with the same curvature. A guide groove extending in the axial direction of the inclined portion is formed on the outer peripheral surface of the inner tube,
The blower jet tube according to any one of claims 1 to 3, wherein a projection portion to be inserted into the guide groove is formed on an inner peripheral surface of the outer tube. .   The blower jet tube according to any one of claims 1 to 4, wherein a retaining portion extending in a radial direction of the inner tube is formed in the guide groove. In the guide groove, a plurality of concave portions are arranged in parallel in the axial direction of the inclined portion,
The blower jet tube according to any one of claims 1 to 5, wherein the protrusion is engaged with the recess. A fixing ring that is externally fitted to the outer tube;
The blower jet tube according to any one of claims 1 to 6, wherein the outer tube and the inner tube are fixed at a predetermined slide position by the fixing ring. The inner peripheral surface of the fixing ring has a smaller diameter at the other end than at one end,
The blower jet tube according to claim 7, wherein an inner diameter of the other end of the fixing ring is smaller than an outer diameter of the outer tube.   The blower jet tube according to claim 7 or 8, wherein an inner peripheral surface of the fixing ring is screwed to an outer peripheral surface of the outer tube.

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