Nozzle

Abstract

A nozzle (20) is attached to a body part of a fluid discharge device. The nozzle (20) comprises: an inner nozzle (30) having an inner flow path (P2); and an outer nozzle (40) disposed in a state in which an outer flow path (P3) is formed outside the inner nozzle (30). A plurality of mountain-shaped pieces (411) having mountain sections (4111) and valley sections (4112) are formed along the circumferential direction at the downstream-side end of the outer nozzle (40).

Description

Nozzle

[0001] This disclosure relates to a nozzle.

[0002] Conventionally, as a nozzle, the one shown in Patent Document 1 below has been proposed. In this Patent Document 1, the flow path in the nozzle is divided into a plurality of divided flow paths across a virtual plane extending radially from the central axis of the nozzle. Then, the central region through which the central axis passes is made into a weak wind region where wind is not directly discharged from the nozzle, and a plurality of positions surrounding this central region are made into strong wind regions where wind is directly discharged from the nozzle. By doing so, even if the hair is wet, it can be effectively separated to increase the contact surface area, and the drying time can be easily and effectively shortened.

[0003] Japanese Patent Application Laid-Open No. 2008-264391

[0004] In such a nozzle, it is preferable to be able to suppress the hair from getting entangled when dispersing the hair.

[0005] This disclosure provides a nozzle capable of more surely suppressing the hair from getting entangled when dispersing the hair.

[0006] The nozzle according to one aspect of this disclosure is a nozzle attached to the main body of a fluid ejection device, and includes an inner nozzle having an inner flow path, and an outer nozzle disposed with an outer flow path formed outside the inner nozzle. A plurality of chevron pieces having peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle.

[0007] According to this disclosure, it is possible to provide a nozzle capable of more surely suppressing the hair from getting entangled when dispersing the hair.

[0008] A perspective view showing an example of a hair dryer A perspective view showing an example of a hair dryer with an example of a nozzle attached A side view showing an example of a hair dryer with an example of a nozzle attached A plan view showing an example of a hair dryer with an example of a nozzle attached A-A cross section of Figure 3 B-B cross section of Figure 4 A perspective view showing an example of a nozzle A side view showing an example of a nozzle A front view showing an example of a nozzle C-C cross section of Figure 9 D-D cross section of Figure 9 A perspective view showing the inner nozzle of an example of a nozzle A side view showing the inner nozzle of an example of a nozzle Front view showing the nozzle F-F cross-section of Figure 14 Cross-section of Figure 14 G-G cross-section of Figure 14 Enlarged view of section E of Figure 13 Enlarged view of section H of Figure 16 Perspective view showing an example of an outer nozzle Side view showing an example of an outer nozzle Front view showing an example of an outer nozzle Cross-section of Figure 21 I-I cross-section of Figure 22 Enlarged view of section J of Figure 22 Enlarged view of section K of Figure 22 Perspective view showing another example of an inner nozzle Side view showing another example of an inner nozzle Front view showing another example of an inner nozzle Cross-section of Figure 27 L-L cross-section of another example of an inner nozzle Side view showing another example of an outer nozzle Front view showing another example of an outer nozzle Cross-section of Figure 30 M-M cross-section

[0009] Hereinafter, an embodiment as an example of this disclosure will be described in detail with reference to the drawings. However, unnecessary details may be omitted. For example, detailed explanations of already well-known matters or redundant explanations of substantially identical configurations may be omitted.

[0010] The attached drawings and the following description are provided to enable a person skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims.

[0011] Furthermore, in the following, a nozzle attachment (hair dryer nozzle) that is detachably attached to a hair dryer (an example of a fluid discharge device) will be used as an example of a nozzle.

[0012] (Embodiment) The nozzle 20 according to this embodiment is used by being detachably attached to the main body 12 of the hair dryer 10, as shown in Figures 1 to 6.

[0013] As shown in Figure 1, the hair dryer 10 comprises a gripping portion 11 that the user holds in their hand, and a main body portion 12 connected in a direction intersecting the gripping portion 11. Although Figure 1 illustrates a gripping portion 11 that is not foldable and is connected to the main body portion 12, it is also possible to connect the gripping portion 11 to the main body portion 12 in a foldable manner. A power cord 13 is routed out from the protruding end of the gripping portion 11, and an operation switch 1921 is slidably mounted on the front of the gripping portion 11 so that it is exposed to the outside. Furthermore, a display portion 191 is formed on the side of the main body portion 12, which allows the user to visually check the power on / off status and other information.

[0014] The hair dryer 10 is equipped with a housing 14 that forms the outer casing, and this housing 14 is constructed by joining together multiple divided parts. A cavity is formed inside the housing 14, and various electrical components such as a switch unit 192 and a control unit 19 are housed within this cavity.

[0015] Furthermore, a wind tunnel (transmission path) P1 is formed inside the main body 12, extending from an inlet opening (suction port) P1a on one side (right side) in the longitudinal direction (left-right direction in Figure 5) to an outlet opening (discharge port) P1b, and the blower unit 15 is housed inside this wind tunnel P1. In this embodiment, as shown in Figures 5 and 6, the blower unit 15 includes a fan 15a and a motor 15b that rotates the fan 15a. By driving the motor 15b to rotate the fan 15a, an airflow W is formed. This airflow W flows into the wind tunnel P1 from the outside through the inlet opening P1a and is mainly discharged to the outside through the outlet opening P1b after passing through the wind tunnel P1. In this embodiment, the motor 15b is positioned in the wind tunnel (transmission path) P1 formed inside the housing 14 with its rotating shaft 15c extending in the direction normal to the outlet opening (discharge port) P1b. A fan 15a is attached to the rotating shaft 15c of the motor 15b. Thus, in this embodiment, the air blowing unit 15 is equipped with a fan 15a that rotates around the rotating shaft 15c of the motor 15b, and the direction of extension of the rotating shaft 15c is substantially the same as the normal to the outlet opening (discharge port) P1b. Furthermore, in this embodiment, the air blowing unit 15 is equipped with a filter 15d, which is located upstream of the fan 15a in the wind tunnel (airflow path) P1.

[0016] Furthermore, the housing 14 includes an outer cylinder 141 having an inlet opening (suction port) P1a and an outlet opening (discharge port) P1b, a rear cover 142 attached to the inlet opening (suction port) P1a side of the outer cylinder 141, and a front cover 143 attached to the outlet opening (discharge port) P1b side of the outer cylinder 141.

[0017] Furthermore, the rear cover 142 has a mesh-like frame 1421 formed thereon, with the opening having a honeycomb shape, so that the inlet opening (air intake) P1a is covered by the mesh-like frame 1421. In addition, a mesh 1422 with an opening ratio of about 55 to 90 percent and a mesh width of about 300 to 650 μm is integrally molded into the frame 1421. This mesh 1422 can be made of, for example, metal or flame-retardant resin such as polyester, and by integrally molding a mesh 1422 with such a fine mesh width, it is possible to more reliably suppress the entry of fine dust and hair into the air tunnel (air passage) P1.

[0018] Furthermore, a substantially cylindrical inner cylinder 16 is provided inside the outer cylinder 141 of the housing 14 in the main body 12, and the airflow W mainly flows inside the inner cylinder 16. A motor 15b that drives the fan 15a is located inside this inner cylinder 16, and a heater 17, which serves as a heating element, is located downstream of this motor 15b. When the heater 17 is activated, warm air is blown out from the outlet opening P1b.

[0019] In this embodiment, the wind tunnel (delivery path) P1 is divided into a main delivery path P10 formed inside the inner cylinder 16 and an ion delivery path P13 formed below the main delivery path P10 (on the gripping portion 11 side), that is, below the inner cylinder 16 (on the gripping portion 11 side). In this embodiment, the central part of the main delivery path P10 formed inside the inner cylinder 16 is an inner delivery path P11 that communicates with the inner flow path P2 of the nozzle 20, and the outer circumference of the main delivery path P10 is an outer delivery path P12 that communicates with the outer flow path P3 of the nozzle 20. In other words, the main body 12 has an inner delivery path P11 that communicates with the inner flow path P2 and an outer delivery path P12 that communicates with the outer flow path P3. With the nozzle 20 attached to the main body 12 of the hair dryer 10, the airflow W that flows into the wind tunnel P1 through the inlet opening P1a is branched into a main airflow W1, a secondary airflow W2, and a secondary airflow W3. The main airflow W1 passes through the inner supply passage P11 and is blown out from the center of the outlet opening (discharge port) P1b. The secondary airflow W2 passes through the outer supply passage P12 and is blown out from the periphery of the outlet opening (discharge port) P1b. The secondary airflow W3 passes through the ion supply passage P13 and is blown out from the bottom of the outlet opening (discharge port) P1b.

[0020] Furthermore, in this embodiment, an internal nozzle 144 is attached to the downstream end of the inner cylinder 16, and the main airflow W1 and the secondary airflow W2 are discharged to the outside after passing through this internal nozzle 144.

[0021] The internal assembly nozzle 144 comprises a substantially cylindrical main body portion 1441 and a crossbar portion 1442 that divides the internal space of the main body portion 1441 into two spaces. This crossbar portion 1442 is formed to extend vertically from the left-right center of the main body portion 1441. In this way, window portions 1443 are formed on the left and right sides of the internal assembly nozzle 144.

[0022] By using an internally assembled nozzle 144 with this configuration and discharging airflow from the two window sections 1443, the air can be directed more evenly onto the hair. By directing the air more evenly onto the hair, the hair can be loosened (separated) appropriately, thereby improving the drying performance of the hair.

[0023] Furthermore, the front cover 143 has an outer assembly nozzle 1434 formed on the outside of the inner assembly nozzle 144, which is spaced apart from the inner assembly nozzle 144.

[0024] Furthermore, the front cover 143 has ion outlets 1431, 1432, and 1433 formed therein, so that ions generated by the ion generator 18 located in the ion supply path P13 are released from the ion outlets 1431, 1432, and 1433 together with the auxiliary airflow W3.

[0025] The nozzle 20 is detachably attached to the main body 12 of the hair dryer 10, which has this configuration.

[0026] In this embodiment, as shown in Figures 7 to 11, the nozzle 20 includes an inner nozzle 30 having an inner flow path P2, and an outer nozzle 40 positioned outside the inner nozzle 30 with an outer flow path P3 formed thereon.

[0027] Thus, in this embodiment, the nozzle 20 has a double structure consisting of an inner nozzle 30 and an outer nozzle 40. This allows the air to pass through the inner flow path P2 and the outer flow path P3, so that multiple bundles of air are discharged from the nozzle 20. This makes it possible to divide the bundle of air that hits the hair into multiple bundles, thus enabling more reliable dispersion of the hair by the air.

[0028] In other words, the nozzle 20 according to this embodiment is a nozzle 20 that is attached to the main body 12 of a hair dryer (fluid discharge device) 10. The nozzle 20 according to this embodiment is a nozzle 20 that can dry a wide area while finely dispersing the hair, with a double nozzle air tunnel configuration consisting of an inner nozzle 30 having an inner flow path P2 and an outer nozzle 40 having an outer flow path P3.

[0029] Furthermore, in this embodiment, the inner nozzle 30 comprises a first cylindrical portion 31 positioned in the center and at least one second cylindrical portion 32 positioned outside the first cylindrical portion 31. The inner flow path P2 comprises a first inner flow path P21 formed inside the first cylindrical portion 31 and second inner flow paths P22 each formed inside the second cylindrical portion 32. In other words, the inner flow path P2 has a divided flow path (second inner flow path P22) that separates the space between the inner nozzle 30 and the outer nozzle 40.

[0030] This allows the airflow passing through the inner channel P2 to be divided into multiple streams, further dispersing the hair strands. This, in turn, shortens the hair drying time.

[0031] In this embodiment, as shown in Figures 12 to 16, four substantially trapezoidal second cylindrical portions 32 are arranged around a substantially cylindrical first cylindrical portion 31, spaced apart in the circumferential direction of the first cylindrical portion 31. That is, the inner nozzle 30 has an outer dividing flow path (second inner flow path P22) that surrounds a central dividing flow path (first inner flow path P21). At this time, the four second cylindrical portions 32 are arranged around the first cylindrical portion 31 such that the distance between adjacent second cylindrical portions 32 in the left-right direction is greater than the distance between adjacent second cylindrical portions 32 in the up-down direction. This ensures that when the inner nozzle 30 is attached to the outer nozzle 40, a wider outer flow path P3 is formed between adjacent second cylindrical portions 32. In this embodiment, the inner nozzle 30 comprises a first cylindrical portion 31 located in the center and four second cylindrical portions 32 located outside the first cylindrical portion 31. However, the number of second cylindrical portions 32 may be one or more, and may be two, three, or five or more.

[0032] Furthermore, in this embodiment, the first cylindrical portion 31 is configured to protrude downstream of the second cylindrical portion 32.

[0033] In this way, the first inner channel P21 located in the center becomes the main channel, and the second inner channel P22 located around the first inner channel P21 becomes a secondary channel. This allows the air passing through the second inner channel P22 to be directed at the hair strands that have been separated by the air passing through the first inner channel P21.

[0034] Furthermore, in this embodiment, as described above, four second inner channels P22 are formed around the first inner channel P21. Therefore, in the nozzle 20 according to this embodiment, four second inner channels P22 are formed around the first inner channel P21, which is the main channel. As a result, the hair bundles that are divided into two at the center and spread outwards by the air passing through the first inner channel P21 can be captured by the four bundles of air surrounding the center. As a result, the hair bundles can be dispersed radially starting from the center of the nozzle 20. Therefore, with the nozzle 20 according to this embodiment, it becomes possible to apply air to a wide area of ​​hair, and the drying time of the hair can be further shortened. Thus, in this embodiment, the inner nozzle 30 has cavities (second inner channels P22) that allow air to enter from all four sides to further divide the hair bundles that have been divided at the center into smaller sections.

[0035] Furthermore, in this embodiment, the first cylindrical portion 31 is provided with a dividing portion 311 that divides the first inner flow path P21 into a plurality of flow paths. Specifically, the first cylindrical portion 31 is provided with a partition wall 3111 that serves as the dividing portion 311.

[0036] This causes the air passing through the first inner channel P21 to be divided into multiple bundles. This reduces the cross-sectional area of ​​each bundle, making it less susceptible to friction and obstacles, thus minimizing airflow loss. Therefore, with the nozzle 20 according to this embodiment, high-velocity air can be discharged from the first inner channel P21, making it easier to separate hairs from each other.

[0037] Furthermore, in this embodiment, a diffusion section 312 is formed in the first cylindrical section 31 to diffuse the air passing through the first inner flow path P21. Specifically, a guide member 3121, which serves as the diffusion section 312, is positioned in the center of the first cylindrical section 31. This guide member 3121 is cone-shaped, gradually expanding in diameter towards the downstream side, and the guide member 3121 and the first cylindrical section 31 are connected by three partition walls 3111.

[0038] Thus, in this embodiment, the first inner flow path P21 is divided into three flow paths defined by the guide member 3121, the first cylindrical portion 31, and the three partition walls 3111. In this embodiment, the guide member 3121 and the first cylindrical portion 31 are formed concentrically, and the three partition walls 3111 are provided at 120-degree intervals. Therefore, the first inner flow path P21 is divided into three flow paths of the same shape and size.

[0039] In this way, a high-velocity diffusing fluid is discharged from each of the three channels of the first inner channel P21. Therefore, with the nozzle 20 according to this embodiment, a high-velocity diffusing air can be discharged from the first inner channel P21, allowing the hairs to be separated and spread apart. As a result, the dispersion of hair can be further improved. In this embodiment, the first cylindrical portion 31 has a partition wall 3111 which serves as a dividing portion 311 that divides the first inner channel P21 into three channels. However, the number of channels divided by the dividing portion 311 may be multiple, that is, two or four or more.

[0040] Furthermore, in this embodiment, a flow velocity reducing means 33 is provided between the first cylindrical portion 31 and the second cylindrical portion 32 to reduce the flow velocity. This ensures that a region with a low flow velocity is formed between the first inner flow path P21 and the second inner flow path P22.

[0041] In this embodiment, the inner nozzle 30 has grooves. Specifically, a groove portion 331 that opens to the downstream side is formed between each second cylindrical portion 32 and the first cylindrical portion 31 (see FIG. 15). By forming the groove portion 331, a part of the wind between the outer nozzle 40 and the inner nozzle 30 (the wind passing through the outer flow path P3) flows into the groove portion 331. By doing so, a weak wind region (a region where the flow velocity is low) is generated at the site where the groove portion 331 is formed. And the wind flowing through the first inner flow path P21 and the wind flowing through the second inner flow path P22 can be more clearly separated by the weak wind generated at the site where the groove portion 331 is formed.

[0042] By doing so, it becomes possible to more reliably suppress the interference between the wind discharged from the first inner flow path P21 and the wind discharged from the second inner flow path P22, so that the speed of the wind discharged from the first inner flow path P21 and the second inner flow path P22 can be made faster.

[0043] Therefore, in the nozzle 20 according to this embodiment, it becomes possible to form a weak wind region between the first inner flow path P21 and the second inner flow path P22, and the wind passing through the first inner flow path P21 and the wind passing through the second inner flow path P22 can be clearly separated by the weak wind region. As a result, the speed of the wind discharged from the first inner flow path P21 and the second inner flow path P22 can be made faster, and the dispersion of the hair can be further improved.

[0044] In this embodiment, as the flow velocity reducing means 33, an example is given in which the groove portion 331 is formed between the second cylindrical portion 32 and the first cylindrical portion 31. However, it is also possible to form a space with a small opening area between the second cylindrical portion 32 and the first cylindrical portion 31 and make this space function as the flow velocity reducing means 33.

[0045] Also, in this embodiment, the opening area of the first inner flow path P21 is gradually reduced from the upstream side to the downstream side. By doing so, the speed of the wind discharged from the first inner flow path P21 can be made faster.

[0046] Similarly, the opening area of the second inner flow path P22 is gradually decreased from the upstream side toward the downstream side. By doing so, the speed of the wind discharged from the second inner flow path P22 can be made faster.

[0047] Thus, in the present embodiment, the wind passing through the inner flow path P2 provided separately from the outer flow path P3 is converged. By doing so, while converging the wind passing through the inner flow path P2 located on the center side, the wind passing through the outer flow path P3 located on the outer peripheral side can be diffused. That is, the converging mechanism by the inner nozzle 30 and the diffusing mechanism by the outer nozzle 40 can be simultaneously reproduced.

[0048] By doing so, when drying the wet hair with wind (fluid), the fluid can be finely dispersed to such an extent that the hair bundles are not entangled and applied to a wider area, and the drying time of the hair can be further shortened.

[0049] Thus, if the wind passing through the inner flow path P2 is converged, the dispersibility of the hair can be further improved.

[0050] Further, in the present embodiment, as shown in FIG. 14, the inner flow path P2 is arranged to be line-symmetrical with respect to the straight line passing through the center point in a front view. That is, the inner nozzle 30 has a line-symmetrical shape.

[0051] By doing so, a uniform wind without a difference in wind speed or wind temperature between the left and right or up and down can be delivered. By doing so, since the difference in the way the hair bundles warm up and separate depending on the part is suppressed, uneven drying due to the part is less likely to occur, and the hair can be dried more uniformly. Also, even when the direction of the hair dryer 10 is changed during use, the aimed wind can always be discharged.

[0052] And the inner nozzle 30 having such a shape is fixed to the outer nozzle 40 to form the nozzle 20.

[0053] In this embodiment, as shown in Figures 19 to 22, the outer nozzle 40 has a cylindrical portion 41 that is substantially circular in front view. At the downstream end of the cylindrical portion 41 (i.e., the downstream end of the outer nozzle 40), a plurality of mountain-shaped pieces 411, each having peaks 4111 and valleys 4112, are formed along the circumferential direction. Specifically, eight mountain-shaped pieces 411 are formed at the downstream end of the cylindrical portion 41 so as to be arranged in the circumferential direction of the outer nozzle 40. In other words, eight mountain-shaped pieces 411 are formed along the inner circumference of the outer nozzle 40. That is, the downstream end of the cylindrical portion 41 has a wave shape in which peaks 4111 and valleys 4112 alternate along the circumferential direction. In this embodiment, a wave shape formed by curved lines is illustrated, but it is also possible to form a wave shape formed by straight lines. The circumferential direction of the outer nozzle 40 refers to the circumferential direction of the outer nozzle 40 as viewed from its cross-section. The cross-sectional shape of the outer nozzle 40 may be approximately circular, or it may be elliptical or square, for example.

[0054] As described above, in this embodiment, a plurality of mountain-shaped pieces 411 having peaks 4111 and valleys 4112 are formed along the circumferential direction at the downstream end of the outer nozzle 40. That is, a plurality of peaks 4111 and a plurality of valleys 4112 are formed alternately and circumferentially at the downstream end of the outer nozzle 40. This makes it possible to further improve the diffusion of air passing through the outer flow path P3. Furthermore, if a plurality of mountain-shaped pieces 411 having peaks 4111 and valleys 4112 are formed along the circumferential direction, the contact area between the air passing through the outer flow path P3 and the outer nozzle 40 becomes smaller at the valleys 4112, so that the generation of turbulence can be suppressed more reliably. Therefore, by using the outer nozzle 40 according to this embodiment, it is possible to increase the diffusion of air passing through the outer flow path P3 while suppressing the generation of turbulence. As a result, it becomes possible to more reliably suppress the dispersed hair bundles from becoming unruly and tangling.

[0055] Furthermore, in this embodiment, the contour shape of the outer nozzle 40 is made to be a smooth curved line. Specifically, as shown in Figure 21, the contour shape of the outer nozzle 40 is made to be circular. In this disclosure, "outer nozzle contour" refers to the inside (inner circumference) of the outer nozzle.

[0056] This prevents edges from forming on the contour of the outer nozzle 40, thus preventing fluid vortices and flow disturbances at the edges. This allows for smoother discharge of air from the outer flow path P3. Furthermore, by preventing edge formation, air loss can be suppressed, allowing the air to be delivered to the target object, such as hair, while maintaining its energy.

[0057] Furthermore, by making the contour shape of the outer nozzle 40 circular, it becomes possible to make the contour shape of the outer nozzle 40 convex (a shape in which there is no recessed part towards the center), thereby making it possible to suppress wind loss more reliably.

[0058] Furthermore, if the contour shape of the outer nozzle 40 is circular, the pressure is distributed uniformly from the center outwards, resulting in a uniform airflow, which allows the air to be applied uniformly to the hair. Thus, with the nozzle 20 according to this embodiment, the air can be applied uniformly to the hair, making it possible to more reliably suppress variations in drying conditions depending on the area. Note that the contour shape of the outer nozzle 40 does not have to be circular; for example, the contour shape of the outer nozzle 40 can be elliptical. It is also possible to make the contour shape of the outer nozzle 40 a figure-eight shape (for example, a shape in which two circles are connected so that an S-shaped curve is formed in the center). By doing so, edges are not formed on the contour of the outer nozzle 40, preventing the fluid from swirling or the flow from becoming turbulent at the edges.

[0059] Furthermore, in this embodiment, the portion of the outer nozzle 40 where the V-shaped piece 411 is formed has an opening area that increases from the upstream side to the downstream side. This allows diffused air (air with increased airflow and decreased airflow velocity) to be discharged from the outer flow path P3. This makes it possible to apply the airflow uniformly to the hair, thus allowing the area to be heated more uniformly.

[0060] Furthermore, in this embodiment, the outer flow path P3 is formed over almost the entire circumference between the inner nozzle 30 and the outer nozzle 40. Specifically, the inner nozzle 30 and the outer nozzle 40 are attached only at the portions where the engaging portion 321 and the engaging projection 412, described later, are formed. The portion between the inner nozzle 30 and the outer nozzle 40, excluding the portions where the engaging portion 321 and the engaging projection 412 are formed, constitutes the outer flow path P3.

[0061] This prevents sudden changes in the airflow discharged from the nozzle 20. This helps to suppress the unruly movement of the hair bundles and more effectively prevent them from getting tangled.

[0062] Furthermore, in this embodiment, the inner nozzle 30 is attached to the outer nozzle 40 by engaging an engaging projection 412 formed on the inner surface of the cylindrical portion 41 with an engaging portion 321 formed on the outer surface of the second cylindrical portion 32. At this time, the engaging projection 412 engages with the engaging portion 321 by moving the inner nozzle 30 relative to the outer nozzle 40 in the axial direction (the extending direction of the rotation axis 15c of the motor 15b). The inner nozzle 30 is then fixed to the outer nozzle 40 so as not to rotate relative to it. This prevents the inner nozzle 30 from moving relative to the outer nozzle 40. This also more reliably prevents changes in the shape of the inner flow path P2 and the outer flow path P3. This makes it possible to align the positional relationship between the peaks 4111 and valleys 4112 of the outer nozzle 40 and the inner nozzle 30 to a predetermined state. Thus, in this embodiment, the inner nozzle 30 and the outer nozzle 40 are fixed by a plurality of ribs (engaging projections 412).

[0063] Furthermore, in this embodiment, when viewed from the front, an engaging projection 412 is formed in the area where the peak portion 4111 is formed. This makes the connection portion between the inner nozzle 30 and the outer nozzle 40 less visible from the outside. When viewed from the front, the outer flow path P3, which is wide and formed between adjacent second cylindrical portions 32, is located in the area where the valley portion 4112 is formed. This reduces the contact area between the airflow beam, which has a relatively large cross-sectional area, and the outer nozzle 40, making it less susceptible to friction and obstacles, and thus more reliably suppressing airflow loss.

[0064] Furthermore, by attaching the inner nozzle 30 to the outer nozzle 40, the inner nozzle 30 and the outer nozzle 40 can be treated as a single unit, making it easier to attach and detach the nozzle 20 to the main body 12.

[0065] In this embodiment, the inner nozzle 30 is fixed to the main body 12 in a way that prevents relative rotation. Specifically, the fixing portion 313 formed at the upstream end of the first cylindrical portion 31 of the inner nozzle 30 is fixed to the fixed portion 1444 formed at the downstream end of the inner assembly nozzle 144, thereby fixing the inner nozzle 30 to the inner assembly nozzle 144 in a way that prevents relative rotation.

[0066] This prevents the nozzle 20 from moving relative to the main body 12. This makes it possible to align the positional relationship between the inner flow path P2 and the outer flow path P3 and the air tunnel (delivery path) P1 inside the main body 12 to a predetermined state. In other words, simply by attaching the nozzle 20 to the main body 12 (inner assembled nozzle 144), the positional relationship between the inner flow path P2 and the outer flow path P3 and the air tunnel (delivery path) P1 inside the main body 12 can be set to a predetermined state. As a result, the user does not need to perform any positioning, making the nozzle 20 more user-friendly.

[0067] In this embodiment, when the nozzle 20 is attached to the main body 12 (internal assembled nozzle 144), the inner flow path P2 communicates with the inner supply path P11 formed in the center of the main body 12, and the outer flow path P3 communicates with the outer supply path P12 formed on the outer circumference of the inner supply path P11.

[0068] In this embodiment, as described above, the air passing through the inner passage P11 becomes the main airflow W1, and the air passing through the outer passage P12 becomes the secondary airflow W2. Therefore, when the nozzle 20 is attached to the main body 12 of the hair dryer 10 shown in this embodiment, a large volume of air is discharged from the inner passage P2, and a small volume of air is discharged from the outer passage P3. In other words, a strong wind is discharged from the inner passage P2, and a weak wind is discharged from the outer passage P3.

[0069] Thus, in this embodiment, when using the hair dryer 10 with the nozzle 20 attached, air is blown out from the nozzle 20 in such a way that a strong airflow area in the center is surrounded by a weaker airflow area at the periphery.

[0070] Furthermore, by ensuring that the airflow from the nozzle 20 is such that a strong central airflow area is surrounded by a weaker peripheral airflow area, the airflow can be gradually directed from the center towards the outer periphery, approaching a windless area. This prevents the hair strands, dispersed by the airflow discharged from the nozzle 20, from suddenly moving to the windless area. Additionally, by gradually directing the airflow from the center towards the outer periphery, turbulence can be more effectively suppressed. Consequently, while enhancing the dispersion of hair with multiple airflow strands, turbulence can be suppressed to prevent hair strands from becoming unruly and to more effectively prevent tangling. As a result, hair can be dried completely without leaving any damp spots.

[0071] Furthermore, in this embodiment, the main body 12 is equipped with a heater 17 as a heating unit that warms the air passing through the inner air passage P11 and the outer air passage P12.

[0072] This ensures that the air discharged from the nozzle 20 is heated more effectively.

[0073] Specifically, the heater 17 is arranged in a ring shape inside the main body 12 (inside the air tunnel P1), with an inner air passage P11 formed inside the heater 17 and an outer air passage P12 formed outside the heater 17. This allows the air passing through the inner air passage P11 and the outer air passage P12 to be heated more efficiently, enabling the heat from the heater 17 to be delivered to the hair more efficiently. This makes it possible to more reliably suppress the occurrence of locally hot spots, and to deliver heat uniformly to the entire air passing through the nozzle 20. As a result, it becomes possible to reduce differences in the drying state depending on the part of the hair.

[0074] As described above, by attaching the nozzle 20 to the main body 12 of the hair dryer 10 according to this embodiment, it becomes possible to apply heated air, such as hot air, to the hair, thus enabling the hair to be dried in a shorter time.

[0075] As described above, in this embodiment, the nozzle 20 uses a double nozzle system consisting of an inner nozzle 30 and an outer nozzle 40, resulting in a double wind tunnel configuration. This allows for a distribution of wind, with the wind speed being maximum in the central strong wind region and gradually decreasing towards the outside. Furthermore, it is possible to simultaneously reproduce the convergence mechanism of the inner nozzle 30 and the diffusion mechanism of the outer nozzle 40 while gradually reducing the displacement of the wind speed.

[0076] In this way, by attaching the nozzle 20 to the main body 12 of the hair dryer 10 according to this embodiment, it is possible to achieve both finely dispersing the hair and drying a wide area.

[0077] Furthermore, by attaching such a nozzle 20 to the main body 12 of the hair dryer 10, it becomes possible to reduce hair tangling, prevent incomplete drying, and achieve a manageable feel immediately after use.

[0078] The inner nozzle 30 can also be configured as shown in Figures 25 to 28.

[0079] In the inner nozzle 30 shown in Figures 25 to 28, the inner flow path P2 is divided into left and right spaces by a roughly V-shaped partition wall 3111 that extends vertically and is wider on the downstream side. By using such an inner nozzle 30, the air flowing into the inner flow path P2 is compressed by the roughly V-shaped partition wall 3111, making it possible to discharge air at an even faster wind speed.

[0080] Furthermore, in the inner nozzle 30 shown in Figures 25 to 28, the inner flow path P2 is not only symmetrical with respect to a straight line passing through the center point when viewed from the front, but is also arranged to be point-symmetrical with respect to the center point. In other words, the inner nozzle 30 is designed to have a point-symmetrical shape.

[0081] This allows for the delivery of a uniform airflow without differences in wind speed or temperature from side to side or up and down, suppressing differences in how hair strands are heated and separated depending on the area. As a result, uneven drying is less likely to occur in different areas, allowing for more uniform drying of the hair. Furthermore, even if the direction of the hair dryer 10 is changed during use, the intended airflow can always be delivered.

[0082] Furthermore, the outer nozzle 40 can also be configured as shown in Figures 29 to 31.

[0083] The outer nozzle 40 shown in Figures 29 to 31 is designed to change the position from which the air is released by the uneven shape of the inner and outer surfaces. Specifically, the mountain-shaped piece 411 having peaks 4111 and valleys 4112 extends in the radial direction of the cylindrical portion 41. The functions and effects shown in the above embodiment can also be achieved by using such an outer nozzle 40.

[0084] (Note) The above description of embodiments discloses the following technology.

[0085] (Technology 1) The nozzle described in Technology 1 is a nozzle attached to the main body of a fluid discharge device, and comprises an inner nozzle having an inner flow path and an outer nozzle arranged outside the inner nozzle with an outer flow path formed thereon. Multiple V-shaped pieces having peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle.

[0086] Thus, the nozzle described in Technology 1 has a double structure consisting of an inner nozzle and an outer nozzle, through which a fluid such as air passes. This allows the fluid bundle that comes into contact with the hair to be divided into multiple parts, thus enabling more reliable dispersion of the hair by the fluid.

[0087] Furthermore, if multiple mountain-shaped pieces with peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle, the diffusivity of the fluid passing through the outer channel can be further improved. In this case, the contact area between the fluid passing through the outer channel and the outer nozzle becomes smaller in the valleys, so the generation of turbulence can be suppressed more reliably. Therefore, if multiple mountain-shaped pieces with peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle, the diffusivity of the fluid passing through the outer channel can be increased while suppressing the generation of turbulence. As a result, the dispersion of hair bundles can be more reliably prevented from becoming tangled.

[0088] In this configuration, it is possible to concentrate the fluid passing through the inner channel, which is separate from the outer channel. This allows for the convergence of the fluid passing through the inner channel located towards the center, while simultaneously diffusing the fluid passing through the outer channel located towards the outer periphery. In other words, it becomes possible to simultaneously reproduce the convergence mechanism by the inner nozzle and the diffusion mechanism by the outer nozzle. As a result, the fluid can be dispersed finely enough to avoid entanglement, allowing it to cover a wider area.

[0089] Thus, by using the nozzle described in Technology 1, it becomes possible to more reliably suppress hair entanglement when dispersing the hair.

[0090] Furthermore, by attaching such a nozzle to a hair dryer, which acts as a fluid discharge device, when drying wet hair by blowing air (fluid) onto it, the wet hair can be effectively dispersed by the air passing through the inner and outer channels. By effectively dispersing the wet hair, the surface area of ​​the hair exposed to air increases, thus shortening the drying time.

[0091] Furthermore, if multiple mountain-shaped pieces with peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle, the diffusivity of the air passing through the outer channel can be further improved. In this case, the contact area between the air passing through the outer channel and the outer nozzle becomes smaller in the valleys, so the generation of turbulence can be suppressed more reliably. Therefore, if multiple mountain-shaped pieces with peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle, the diffusivity of the air passing through the outer channel can be increased while suppressing the generation of turbulence. As a result, the dispersion of hair bundles can be more reliably prevented from becoming tangled.

[0092] In this case, by converging the airflow passing through an inner channel, which is separate from the outer channel, even wet hair can be more effectively dispersed by the airflow passing through the inner channel.

[0093] Therefore, if the nozzle for the hair dryer is configured as described in Technology 1, it becomes possible to concentrate the airflow passing through the inner channel located on the central side while diffusing the airflow passing through the outer channel located on the outer side. In other words, it becomes possible to simultaneously reproduce the convergence mechanism by the inner nozzle and the diffusion mechanism by the outer nozzle. As a result, it becomes possible to dry the hair by applying airflow to a wide area of ​​hair while dispersing the hair strands finely enough so as not to tangle.

[0094] (Technology 2) In the nozzle described in Technology 2, the inner nozzle comprises a first cylindrical portion located in the center and at least one second cylindrical portion located outside the first cylindrical portion. The inner flow path comprises a first inner flow path formed inside the first cylindrical portion and second inner flow paths each formed inside the second cylindrical portion.

[0095] This allows the fluid, such as air passing through the inner channel, to be divided into multiple parts, enabling the hair, or other strands of hair, to be dispersed even more finely. Therefore, if the nozzle for a hair dryer is configured as described in Technology 2, the hair drying time can be further reduced.

[0096] (Technology 3) In the nozzle described in Technology 3, the first cylindrical portion protrudes downstream of the second cylindrical portion, compared to the nozzle described in Technology 2.

[0097] In this way, the first inner channel located in the center becomes the main channel, and the second inner channel located around the first inner channel becomes a secondary channel. As a result, the fluid passing through the second inner channel can be directed to the hair bundles that have been divided by the fluid passing through the first inner channel.

[0098] In this case, if multiple second inner channels are formed around the first inner channel, multiple second inner channels will be formed around the first inner channel, which will be the main channel. As a result, the hair bundle that splits into two at the center and spreads outwards can be captured by multiple flow fluxes surrounding the center. Consequently, the hair bundle can be dispersed radially starting from the center of the nozzle.

[0099] Therefore, if the nozzle for the hair dryer is configured as described in Technology 3, it becomes possible to apply air to a wide area of ​​the hair, thereby further shortening the hair drying time.

[0100] (Technical 4) In the nozzle described in Technical 4, the nozzle described in Technical 2 or Technical 3 has a division portion formed in the first cylindrical portion that divides the first inner flow path into a plurality of flow paths.

[0101] This process divides the fluid passing through the first inner channel into multiple bundles. As a result, the cross-sectional area of ​​each bundle becomes smaller, making it less susceptible to friction and obstacles, thus reducing losses in fluid discharge volume, such as airflow.

[0102] Therefore, if the nozzle for the hair dryer is configured as described in Technology 4, it will be possible to discharge a high-velocity airflow, making it easier to separate the hair strands from each other.

[0103] (Technology 5) In the nozzle described in Technology 5, in the nozzle described in any one of Technology 2 to Technology 4, a diffusion section is formed in the first cylindrical section to diffuse the air passing through the first inner flow path.

[0104] This allows a high-velocity diffusing fluid to be discharged from the first inner channel.

[0105] Therefore, if the nozzle for the hair dryer is configured as described in Technology 5, a high-velocity diffused airflow can be discharged from the first inner flow path, allowing the hairs to be separated and spread apart. As a result, the dispersion of the hair can be further improved.

[0106] (Technology 6) In the nozzle described in Technology 6, a flow velocity reducing means for reducing the flow velocity is provided between the first cylindrical portion and the second cylindrical portion, in the nozzle described in any one of the technologies from Technology 2 to Technology 5.

[0107] This makes it possible to create a low-velocity region between the first inner channel and the second inner channel, clearly separating the fluid passing through the first inner channel from the fluid passing through the second inner channel by this low-velocity region. As a result, it becomes possible to increase the velocity of the fluid discharged from both the first and second inner channels.

[0108] Therefore, if the nozzle for the hair dryer is configured as described in Technology 6, it becomes possible to form a weak airflow region between the first inner flow path and the second inner flow path, and it becomes possible to clearly separate the air passing through the first inner flow path from the air passing through the second inner flow path by the weak airflow region. As a result, it becomes possible to increase the speed of the air discharged from the first inner flow path and the second inner flow path, thereby improving the dispersion of hair.

[0109] (Technology 7) In the nozzle described in Technology 7, the first inner flow path is formed such that the opening area decreases from the upstream side to the downstream side, in the nozzle described in any one of the technologies from Technology 2 to Technology 6.

[0110] This makes it possible to increase the velocity of the fluid discharged from the first inner channel, thereby improving the dispersion of the hairs.

[0111] Therefore, if the nozzle for the hair dryer is configured as described in Technology 7, it becomes possible to increase the speed of the air discharged from the first inner flow path, thereby further improving the dispersion of hair.

[0112] (Technology 8) In the nozzle described in Technology 8, the second inner flow path is formed such that the opening area decreases from the upstream side to the downstream side, in the nozzle described in any one of the technologies from Technology 2 to Technology 7.

[0113] This allows for a higher velocity of the fluid discharged from the second inner channel, thereby improving the dispersion of the hairs.

[0114] Therefore, if the nozzle for the hair dryer is configured as described in Technology 8, it becomes possible to increase the speed of the air discharged from the second inner flow path, thereby further improving the dispersion of hair.

[0115] (Technology 9) In the nozzle described in Technology 9, the inner flow path is arranged to be point-symmetric with respect to the center point, as in the nozzle described in any one of Technology 1 to Technology 8.

[0116] This allows for the discharge of a uniform fluid with no differences in flow velocity or fluid temperature between the left and right, or between the top and bottom. Furthermore, even if the direction of the fluid discharge device is changed during use, the desired fluid can always be discharged.

[0117] Therefore, by using the configuration described in Technology 9 for the hair dryer nozzle, it becomes possible to deliver a uniform airflow without differences in air velocity or temperature between left and right, and up and down. As a result, differences in how hair strands are heated and separated depending on the area are suppressed, making it less likely for hair to dry unevenly and allowing for more uniform drying. In addition, even if the direction of the hair dryer is changed during use, the intended airflow can always be delivered.

[0118] (Technology 10) In the nozzle described in Technology 10, the inner flow path is arranged to be symmetric with respect to a straight line passing through the center point, as in the nozzle described in any one of the technologies from Technology 1 to Technology 9.

[0119] This allows for the discharge of a uniform fluid with no differences in flow velocity or fluid temperature between the left and right or up and down. Furthermore, even if the direction of the fluid discharge device is changed during use, the desired fluid can always be discharged.

[0120] Therefore, by using the configuration described in Technology 10 for the hair dryer nozzle, it becomes possible to deliver a uniform airflow without differences in air velocity or temperature between left and right or up and down. As a result, differences in how hair strands are heated and separated depending on the area are suppressed, making it less likely for hair to dry unevenly and allowing for more uniform drying. In addition, even if the direction of the hair dryer is changed during use, the intended airflow can always be delivered.

[0121] (Technology 11) In the nozzle described in Technology 11, the outline shape of the outer nozzle is a smooth curved line, as described in any one of the technologies from Technology 1 to Technology 10.

[0122] This prevents the formation of edges on the outer nozzle's contour, eliminating fluid vortices and flow disturbances at the edges. As a result, the fluid can be discharged more smoothly from the outer channel. Furthermore, by preventing edge formation, fluid energy loss can be suppressed, allowing the fluid to be delivered to targets such as hair while maintaining its energy.

[0123] Therefore, if the nozzle for the hair dryer is configured as described in Technology 11, the airflow will not swirl or become turbulent at the edge, allowing the air to be discharged more smoothly from the outer flow path. In addition, by preventing the formation of an edge, air loss can be suppressed, allowing the air to be delivered to the target object, such as hair, while maintaining its energy.

[0124] (Technical 12) In the nozzle described in Technical 12, the outline shape of the outer nozzle is circular or elliptical, as in the nozzle described in Technical 11.

[0125] Thus, by making the contour shape of the outer nozzle a circle or an ellipse, it becomes possible to make the contour shape of the outer nozzle a convex shape (a shape in which there is no concave part towards the center), thereby making it possible to suppress fluid energy loss more reliably.

[0126] Furthermore, if the outer nozzle's contour shape is circular, the pressure is distributed uniformly from the center outwards, resulting in a uniform fluid flow. As a result, the fluid can be applied evenly to the hair.

[0127] Therefore, if the nozzle for the hair dryer is configured as described in Technology 12, the contour shape of the outer nozzle can be made convex (a shape in which there is no recessed part towards the center), which makes it possible to more reliably suppress airflow loss. Also, if the contour shape of the outer nozzle is circular, the pressure is distributed uniformly from the center outwards, resulting in a uniform airflow. As a result, the air can be applied uniformly to the hair, which makes it possible to more reliably suppress variations in drying conditions depending on the area.

[0128] (Technical 13) In the nozzle described in Technical 13, in the nozzle described in any one of the technicals from Technical 1 to Technical 12, the portion of the outer nozzle where the V-shaped piece is formed is formed such that the opening area increases from the upstream side to the downstream side.

[0129] This allows the diffused fluid (fluid whose flow rate has increased and whose flow velocity has decreased) to be discharged from the outer channel.

[0130] Therefore, if the nozzle for the hair dryer is configured as described in Technology 13, diffused air (air with increased volume and decreased velocity) can be discharged from the outer flow path. This allows the air with volume to be applied uniformly to the hair, thus enabling more uniform heating of the area to which the air is applied.

[0131] (Technical 14) In the nozzle described in Technical 14, the outer flow path is formed over almost the entire circumference between the inner nozzle and the outer nozzle, in the nozzle described in any one of the technical 1 to 13.

[0132] This prevents sudden changes in the fluid discharged from the nozzle, which in turn suppresses hair tangling and more effectively prevents hair from becoming unruly.

[0133] Therefore, by using the configuration described in Technology 14 for the hair dryer nozzle, it is possible to suppress sudden changes in the speed of the air discharged from the nozzle, thereby suppressing the unruly movement of hair strands and more reliably preventing hair from getting tangled.

[0134] (Technical 15) In the nozzle described in Technical 15, the inner nozzle is fixed to the outer nozzle so as not to rotate relative to it, as in the nozzle described in any one of the technical 1 to 14.

[0135] This prevents the inner nozzle from moving relative to the outer nozzle, thus more reliably preventing changes in the shape of the inner and outer flow paths. As a result, the positional relationship between the peaks and valleys of the outer nozzle and the inner nozzle can be set to a predetermined state. Furthermore, since the inner and outer nozzles can be treated as a single unit, attaching and detaching the nozzles to the main body becomes easier.

[0136] (Technical 16) In the nozzle described in Technical 16, the inner nozzle is fixed to the main body so as not to rotate relative to it, as in the nozzle described in any one of the technicals from Technical 1 to Technical 15.

[0137] This prevents the nozzle from moving relative to the main body, allowing the positional relationship between the inner and outer flow paths and the internal circulation path within the main body to be set to a predetermined state. In other words, simply by attaching the nozzle to the main body, the positional relationship between the inner and outer flow paths and the internal circulation path within the main body can be set to a predetermined state. As a result, the need for the user to perform positional adjustments is eliminated, making the nozzle more user-friendly.

[0138] (Technical 17) In the nozzle described in Technical 17, in the nozzle described in any one of Technical 1 to Technical 16, the main body has an inner passage communicating with an inner flow path and an outer passage communicating with an outer flow path. The main body is equipped with a heating section that heats the air passing through the inner passage and the outer passage.

[0139] This allows for more reliable heating of the fluid being discharged from the nozzle.

[0140] Therefore, by attaching a nozzle to the main body as described in Technology 17, a heated fluid such as hot air can be applied to hair, allowing the hair to be dried in a shorter time.

[0141] [Other] The details of the nozzle described herein have been explained above, but it will be obvious to those skilled in the art that various modifications and improvements are possible, and that the invention is not limited to these descriptions.

[0142] For example, this disclosure can be applied to embodiments in which the configuration shown in the above embodiments has been modified, replaced, added, or omitted. Furthermore, it is possible to combine the components described in the above embodiments to create new embodiments.

[0143] Furthermore, in the above embodiments and their modifications, a hair dryer (air blower) that blows air was used as an example of a fluid discharge device. However, the fluid discharge device of this disclosure can be any of the household and commercial devices that discharge fluid, such as other hair care devices that blow air or devices that blow dye to dye fibrous objects.

[0144] Furthermore, the specifications of the inner nozzle, outer nozzle, and other details (shape, size, layout, etc.) can be changed as needed.

[0145] The nozzle described herein can be applied to various types of nozzles, including those for household and commercial use. For example, it can be applied to nozzles in hair care devices such as hair dryers, and to devices used for dyeing fibrous materials.

[0146] 10 Hair dryer (fluid discharge device) 11 Gripping part 12 Main body 13 Power cord 14 Housing 141 Outer cylinder 142 Rear cover 1421 Frame 1422 Mesh 143 Front cover 1431 Ion outlet 1432 Ion outlet 1433 Ion outlet 1434 Outer assembled nozzle 144 Inner assembled nozzle 1441 Main body 1442 Rivet part 1443 Window part 1444 Fixed part 15 Blower part 15a Fan 15b Motor 15c Rotating shaft 15d Filter 16 Inner cylinder 17 Heater (heating part) 18 Ion generator 19 Control unit 191 Display unit 192 Switch unit 1921 Operation switch 20 Nozzle 30 Inner nozzle 31 P1 Cylinder section 311 Divided section 3111 Partition wall 312 Diffusion section 3121 Guiding member 313 Fixing section 32 Second cylinder section 321 Engaging section 33 Flow velocity reduction means 331 Groove section 40 Outer nozzle 41 Cylinder section 411 V-shaped section 4111 Peak section 4112 Valley section 412 Engaging projection P1 Wind tunnel P10 Main passage P11 Inner passage P12 Outer passage P13 Ion passage P1a Inlet opening P1b Outlet opening P2 Inner passage P21 First inner passage P22 Second inner passage P3 Outer passage W Airflow W1 Main airflow W2 Secondary airflow W3 Secondary airflow

Claims

1. A nozzle to be attached to the main body of a fluid discharge device, comprising: an inner nozzle having an inner flow path; and an outer nozzle positioned outside the inner nozzle with an outer flow path formed thereon, wherein a plurality of V-shaped pieces having peaks and valleys are formed along the circumferential direction at the downstream end of the outer nozzle.

2. The nozzle according to claim 1, wherein the inner nozzle comprises a first cylindrical portion located in the center and at least one second cylindrical portion located outside the first cylindrical portion, and the inner flow path comprises a first inner flow path formed inside the first cylindrical portion and second inner flow paths each formed inside the second cylindrical portion.

3. The nozzle according to claim 2, wherein the first cylindrical portion protrudes downstream of the second cylindrical portion.

4. The nozzle according to claim 2, wherein the first cylindrical portion has a dividing portion formed therein that divides the first inner flow path into a plurality of flow paths.

5. The nozzle according to claim 2, wherein the first cylindrical portion has a diffusion portion formed therein for diffusing the air passing through the first inner flow path.

6. The nozzle according to claim 2, wherein a flow velocity reducing means for reducing the flow velocity is provided between the first cylindrical portion and the second cylindrical portion.

7. The nozzle according to claim 2, wherein the first inner flow path is formed such that the opening area decreases from the upstream side to the downstream side.

8. The nozzle according to claim 2, wherein the second inner channel is formed such that its opening area decreases from the upstream side to the downstream side.

9. The nozzle according to any one of claims 1 to 8, wherein the inner flow path is arranged to be point-symmetric with respect to a central point.

10. The nozzle according to any one of claims 1 to 8, wherein the inner flow path is arranged to be symmetric with respect to a straight line passing through the center point.

11. The nozzle according to any one of claims 1 to 8, wherein the contour shape of the outer nozzle is a smooth curved line.

12. The nozzle according to claim 11, wherein the contour shape of the outer nozzle is a circle or an ellipse.

13. The nozzle according to any one of claims 1 to 8, wherein the portion of the outer nozzle on which the V-shaped piece is formed is formed such that the opening area increases from the upstream side to the downstream side.

14. The nozzle according to any one of claims 1 to 8, wherein the outer flow path is formed over substantially the entire circumference between the inner nozzle and the outer nozzle.

15. The nozzle according to any one of claims 1 to 8, wherein the inner nozzle is fixed to the outer nozzle in a manner that prevents relative rotation.

16. The nozzle according to any one of claims 1 to 8, wherein the inner nozzle is fixed to the main body so as not to rotate relative to it.

17. The nozzle according to any one of claims 1 to 8, wherein the main body has an inner passage that communicates with the inner flow path and an outer passage that communicates with the outer flow path, and the main body is equipped with a heating section that heats the air passing through the inner passage and the outer passage.

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