WO2015129076A1

WO2015129076A1 - Drying device

Info

Publication number: WO2015129076A1
Application number: PCT/JP2014/071452
Authority: WO
Inventors: 秋吉　雅夫; 誠谷島; 菊地　仁; 一輝岡本
Original assignee: 三菱電機株式会社
Priority date: 2014-02-27
Filing date: 2014-08-14
Publication date: 2015-09-03
Also published as: JP6270985B2; CN106028892B; JPWO2015129076A1; TW201544061A; CN106028892A; TWI593376B

Abstract

　The purpose of the present invention is to provide a drying device that can reduce noise while suppressing decreases in drying performance. The drying device is provided with a body in which a concave hand insertion part is formed, an airflow-generating part provided inside the body, and a nozzle part formed in the hand insertion part of the body, the nozzle part having a nozzle hole through which air fed in from the airflow-generating part is blown out; the nozzle part has an inflow surface extending along the direction in which the nozzle hole is formed, and an uneven part provided so as to protrude from the inflow surface, the top surface of the uneven part having a flat surface formed so as to extend from the side of the inflow surface to an outlet of the nozzle hole.

Description

Drying equipment

The present invention relates to a drying apparatus.

The drying device that dries wet hands by the air flow blown out from the nozzle holes is cheaper than paper towels and rental towels, and is hygienic and can be used without contact. There is.

However, the drying device blows out an air flow generated by a fan or the like from an air outlet (corresponding to the nozzle hole described below), and noise increases when the air flow speed is increased to improve the drying performance. There is a problem of doing.

In addition, as a drying apparatus that solves the above-described problem, for example, Patent Document 1 discloses a drying apparatus that includes a jet port in which stepped irregularities that are continuous in the air flow direction are formed inside a wall surface that forms the jet port. An apparatus is disclosed.

Japanese Patent Laying-Open No. 2003-180556 (for example, see FIG. 12)

However, in a drying apparatus such as Patent Document 1, since there are step-like irregularities that continue in the flow direction, the disturbance generated on the upstream side collides with the concave part (or convex part) on the downstream side, and the disturbance is further amplified. There is a case. By repeating such a flow a plurality of times until the outlet, the region where the turbulence exists becomes larger as it goes downstream, and the effective width that functions as the flow path becomes narrower. As a result, there is a problem that the flow resistance increases, the flow rate decreases, and the desired drying performance cannot be obtained.

The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a drying apparatus capable of reducing noise while suppressing a decrease in drying performance.

The drying apparatus according to the present invention has a main body in which a concave hand insertion part is formed, an air flow generation part provided in the main body, and a nozzle hole through which air fed from the air flow generation part is blown out, A nozzle portion formed in the manual insertion portion of the main body, the nozzle portion has an inflow surface extending along the forming direction of the nozzle hole, and a step portion provided to protrude from the inflow surface, The upper surface of the stepped portion has a flat surface formed so as to extend from the inflow surface side to the outlet of the nozzle hole.

Since the drying apparatus according to the present invention has the above-described configuration, it is possible to reduce noise while suppressing a decrease in drying performance.

It is sectional drawing which shows schematic structure of the drying apparatus which concerns on Embodiment 1 of this invention. It is an external appearance perspective view of the drying apparatus shown in FIG. It is a longitudinal cross-sectional view of the nozzle hole of the nozzle part of the drying apparatus which concerns on Embodiment 1 of this invention. It is a perspective view of the periphery of the nozzle hole shown in FIG. It is modification 1 of the drying apparatus which concerns on Embodiment 1 of this invention. It is the modification 2 of the drying apparatus which concerns on Embodiment 1 of this invention. It is a front view of the part of the nozzle hole of the nozzle of the drying apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing of A1, A2, and A3 of Fig.7 (a). It is a longitudinal cross-sectional view of the drying apparatus which concerns on Embodiment 3 of this invention. It is a front view of the rectangular nozzle arrange | positioned intermittently in a 1st direction. It is a front view of the wavy nozzle arrange | positioned intermittently in a 1st direction.

Hereinafter, embodiments of a drying apparatus according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a schematic configuration of a drying apparatus 200 according to the first embodiment. FIG. 2 is an external perspective view of the drying apparatus 200 shown in FIG. In the drawings described below, the Z direction corresponds to the vertical direction.

[Description of configuration]
As shown in FIG. 1, the drying apparatus 200 according to the first embodiment includes a main body 1 in which a hand insertion portion 2 into which a finger is inserted is formed, an air flow generation portion 6 provided in the main body 1, A hand detection sensor 30 that detects whether or not a finger has been inserted into the hand insertion unit 2 and a control device 31 that drives the airflow generation unit 6 based on the detection result of the hand detection sensor 30 are provided.

(Main unit 1)
The main body 1 has a hand insertion portion 2 formed in a concave shape for inserting a finger at the top, and a nozzle hole 5 from which air fed from the air flow generation portion 6 is blown out and extends in the first direction X. The nozzle portion 4a and the nozzle portion 4b formed in the hand insertion portion 2, the suction port 9 used for taking air into the main body 1, and the air passage member 32 provided in the main body 1 It is what. The first direction X corresponds to the longitudinal direction of the nozzle hole 5.

The manual insertion portion 2 is a concave portion formed so as to open the upper side of the main body 1 and the opposite side surfaces. The manual insertion portion 2 includes an upper opening 2A formed on the upper side, and a side opening 2B and a side opening 2C formed on the side. Therefore, fingers can be inserted into the hand insertion portion 2 not only from the upper opening 2A side of the main body 1 but also from the side opening 2B and the side opening 2C. The hand insertion portion 2 is formed with an inner wall 2D on the side where fingers are inserted. The inner wall 2D is impregnated with a water-repellent coating such as silicon or fluorine, a hydrophilic coating such as titanium oxide, or an antibacterial agent. Thereby, it can reduce that dirt adheres to inner wall 2D of hand insertion part 2, and it can control that bacteria breed. The inner wall 2D has a first inner wall 2D1 in which the nozzle portion 4a is formed, and a second inner wall 2D2 in which the nozzle portion 4b is formed and faces the first inner wall 2D1. That is, the nozzle part 4a is provided in the 1st inner wall 2D1 which is a front wall surface among the mutually opposing inner walls 2D of the manual insertion part 2, and the 2nd inner wall 2D2 which is a wall surface on the back side is provided. The nozzle part 4b is provided.
The first inner wall 2D1 is formed, for example, so as to extend in the Z direction, and an upper portion provided with the nozzle portion 4a is, for example, a vertical surface, and a lower side of the vertical surface is an inclined surface. The second inner wall 2D2 is formed so as to extend in the Z direction, for example. For example, the upper portion where the nozzle portion 4b is provided is an inclined surface, and the lower side of the inclined surface is a vertical surface. .

In addition, a drain port (not shown) for draining water scattered from the hand is provided on the bottom surface of the hand insertion portion 2, and a drain pipe (not shown) is connected to the drain port. A drain tank (not shown) for collecting drain water flowing out from the tank is connected.

As shown in FIG. 1, the nozzle portion 4 a and the nozzle portion 4 b are provided at positions facing each other, and are provided on both the back side and the palm side of the hand (not shown) inserted into the hand insertion portion 2. Wind can be applied simultaneously, and fingers can be dried with high efficiency. In the nozzle part 4a and the nozzle part 4b, an elongated nozzle hole 5 opened in a slit shape is formed. Then, the air flow formed by the operation of the air flow generation unit 6 passes through the nozzle hole 5 and is discharged to the hand insertion unit 2 so that the hand can be dried.
The nozzle part 4a is formed below the nozzle part 4b. The nozzle portion 4a is provided on the first inner wall 2D1 so as to face in the horizontal direction. On the other hand, the nozzle portion 4b is formed on the inclined surface portion of the second inner wall 2D2, and the nozzle portion 4b is provided so that the air flow flowing out from the nozzle portion 4b is directed toward the inside of the manual insertion portion 2. It has been. For this reason, in the drying apparatus 200, the traveling direction of the air blown from the nozzle portion 4a and the traveling direction of the air blown from the nozzle portion 4b intersect each other.

(Suction port 9)
The suction port 9 is formed on the bottom side of the main body 1. The suction port 9 communicates with the air path A formed in the main body 1. For this reason, when the air flow generating unit 6 is driven, air is taken into the air passage A of the main body 1 through the suction port 9, and the taken-in air is manually inserted through the nozzle part 4a and the nozzle part 4b. 2 is released. The formation position of the suction port 9 is not limited to the bottom side of the main body 1, but if it is formed on the bottom portion, it is difficult for dust and the like to be taken into the main body 1, and the user accidentally puts a finger on the suction port 9. It is possible to prevent the insertion and the like, and it is possible to suppress the reduction in design properties.

(Airway member 32)
The air passage member 32 constitutes a part of the air passage A formed in the main body 1. The air passage member 32 includes an upstream air passage member 32A, a midstream air passage member 32B, and a downstream air passage member 32C. The upstream air passage member 32A, the middle air passage member 32B, and the downstream air passage member 32C are provided in the main body 1 so as to be parallel to the horizontal direction, for example. Note that the upstream air passage member 32A, the middle air passage member 32B, and the downstream air passage member 32C are arranged in the main body 1 in order from the bottom. In addition, an air flow generation unit 6 is disposed between the midstream air passage member 32B and the downstream air passage member 32C. On the upstream side of the air flow generation unit 6 in the air path A, a curved flow path is formed. Thereby, although it becomes a little resistance with respect to the air which flows in from the suction inlet 9, it has the effect that the noise which generate | occur | produced in the airflow generation part 6 becomes difficult to be radiated | emitted to the circumference | surroundings. Here, on the downstream side of the air flow generation unit 6 in the air path A, the air flow branches off into the nozzle part 4 a side inside the main body 1 and the nozzle part 4 b side inside the main body 1.

(Air flow generator 6)
The airflow generation unit 6 generates an airflow and discharges air from the nozzle hole 5 to the manual insertion unit 2. The main body 1 is provided with

nozzle portions

4 a and 4 b at the air flow outlet portion, and the pressure on the inlet side of the nozzle hole 5 is increased by the action of the air flow generation portion 6. That is, the airflow generation part 6 is installed inside the main body 1 as a pressurizing device as shown in FIG.

The airflow generator 6 is composed of, for example, a motor and a fan attached to the motor shaft. The airflow generator 6 can be constituted by, for example, a drive circuit (not shown) for driving a DC brushless motor, a turbo fan (not shown) rotated by the DC brushless motor, and the like.

Inside the main body 1, it is partitioned into a space 8 upstream of the air flow generator 6 and a space 7 downstream of the air flow generator 6, and has a suction port 9 that leads to the space 8. The air flow generator 6 sucks air into the main body 1 from the suction port 9 and outputs a high-pressure air flow to the space 8. The air flow discharged from the air flow generation unit 6 branches into two paths in the downstream space 7 and is discharged to the outside of the main body 1 from the nozzle hole 5 of the nozzle unit 4a and the nozzle hole 5 of the nozzle unit 4b. Is done. In addition, it is good to set the space | interval of the nozzle part 4a and the nozzle part 4b, the rotation speed of the airflow generation part 6, etc. so that hand drying time can be shortened more.

(Hand detection sensor 30)
The hand detection sensor 30 detects a finger and is provided on the inner wall 2D of the hand insertion portion 2. As shown in FIG. 1, the hand detection sensor 30 is provided, for example, at the upper part and the lower part of the first inner wall 2D1, and is provided at the upper part of the second inner wall 2D2. The hand detection sensor 30 is electrically connected to the control device 31, and the detection result is output to the control device 31.

(Control device 31)
The control device 31 controls the air flow generator 6 based on the detection result of the hand detection sensor 30. The control device 31 processes a signal from the hand detection sensor 30 and appropriately controls the operation of the airflow generation unit 6 based on the processing result. For example, the control device 31 drives the air flow generation unit 6 when the hand detection sensor 30 detects a finger, and stops the air flow generation unit 6 when the hand detection sensor 30 stops detecting the finger. In addition, although the installation position of the control apparatus 31 is not specifically limited, In this Embodiment 1, the example installed in the lower part side in the main body 1 is shown, as shown in FIG.

[Description of operation]
Next, the operation of the drying apparatus 200 according to the first embodiment will be described. For example, when a wet hand is inserted into the hand insertion unit 2 and the hand detection sensor 30 detects the hand, a hand detection signal is sent to the control device 31. And the control apparatus 31 starts the air flow generation part 6, and the turbo fan of the air flow generation part 6 rotates.

The air flow sucked from the suction port 9 passes through the space 8 of the air passage A and flows into the air flow generation unit 6, and becomes a high-pressure air flow by the air flow generation unit 6. The high-pressure air flow branches into two in the space 7 of the air passage A and is discharged from the nozzle holes 5 provided in the nozzle portion 4a and the nozzle portion 4b.

The discharged air flow hits both the back side and the palm side of the hand inserted into the hand insertion part 2, and the water attached to the hand is scattered and vaporized. When the user's hand comes out of the hand insertion unit 2, the air flow generation unit 6 is stopped by the control device 31 when the hand detection signal from the hand detection sensor 30 disappears.

In the drying apparatus 200 described above, noise generating elements include the nozzle hole 5 in which a high-speed air flow flows in the vicinity of a stationary wall surface, and the high-speed air flow discharged from the nozzle holes 5 of the nozzle portion 4a and the nozzle portion 4b. Are the hand insertion part 2 that collides with the air flow generation part 6 having a high-speed rotating body.

Since the air flow generation unit 6 is housed inside the main body 1, the influence on the overall noise value is smaller than the other two. The drying device 200 has a configuration that suppresses noise in the nozzle hole 5 and the manual insertion portion 2. Here, the noise caused by the noise in the nozzle hole 5 and the collision of the high-speed air flow emitted from the nozzle hole 5 at the manual insertion portion 2 is greatly influenced by the shape of the nozzle hole 5.

[Detailed Description of Nozzle Portion 4a and Nozzle Hole 5 of Nozzle Portion 4b]
FIG. 3 is a longitudinal cross-sectional view of the nozzle part 4a and the nozzle hole 5 of the nozzle part 4b of the drying apparatus 200 according to the first embodiment. FIG. 4 is a perspective view of the periphery of the nozzle hole 5 shown in FIG. The shape of the opening of the nozzle hole 5 of the nozzle portion 4a and the nozzle portion 4b (the shape of the outlet 10) is a linear slit shape extending in the first direction X. And the shape of the nozzle hole 5 of the nozzle part 4a and the nozzle part 4b is formed so that the upper surface side and the lower surface side facing an upper surface side may become symmetrical.
Below, the nozzle part 4a and the nozzle part 4b are named generically, and are demonstrated.

The nozzle portion 4 includes a curved surface portion 13 formed on the inflow side, an inflow surface 17 extending along the forming direction of the nozzle hole 5, and a step portion 40 formed to protrude from the inflow surface 17. Yes. That is, the inflow surface 17 is a flat surface extending from the side connected to the curved surface portion 13 to the side connected to the stepped portion 40, and the stepped portion 40 protrudes upward with respect to the height position of the inflow surface 17. It is a part. Here, the formation direction of the nozzle hole 5 corresponds to the Y direction shown in FIGS. 3 and 4.

(Curved surface portion 13)
The curved surface portion 13 is formed on the inlet side of the nozzle portion 4. In the curved surface portion 13, air flowing from the air flow generation unit 6 through the air path A flows. The upper and lower curved surface portions 13 are formed so as to face each other in the nozzle hole 5. The curved surface portions 13 are formed so that the interval between the curved surface portions 13 becomes narrower toward the downstream side.
That is, on the upstream side of the nozzle hole 5 of the nozzle portion 4, the facing distance between the upper surface and the lower surface is gradually reduced from the upstream side to the downstream side so that air smoothly flows into the nozzle hole 5. It is the formed R part.

If the nozzle hole does not have the curved surface portion 13, it is difficult for air to smoothly flow into the nozzle hole 5, so that an area that reduces the flow area of the main flow 15 passing through the nozzle hole 5 is formed on the upstream side. It becomes easy to be done. Thereby, a pressure loss becomes large, a flow rate falls, and it becomes difficult to obtain desired drying performance. On the other hand, in the drying apparatus 200 according to the first embodiment, since the curved surface portions 13 are formed on both the upper and lower surfaces, the air smoothly flows into the nozzle hole 5 and the pressure loss is suppressed from increasing. Can be suppressed, and desired drying performance can be obtained.

(Inflow surface 17)
The inflow surface 17 has one end connected to the curved surface portion 13 and the other end connected to the stepped portion 40. The inflow surface 17 is a portion through which air flowing through the curved surface portion 13 flows. The inflow surface 17 has a flat surface formed so as to extend in the second direction Y. That is, the nozzle portion 4 has an inflow surface 17 that is opposed to the top and bottom and is a flat surface in the slit-like longitudinal direction (width direction) of the nozzle hole 5.

(Step 40)
The step portion 40 is formed so as to protrude from the inflow surface 17, and a flat surface is formed on the step portion upper surface 41. 3 and FIG. 4, the stepped portion 40 is connected to the inflow surface 17 and extends from the inflow surface 17 side to the outlet 10 side of the nozzle hole 5. One end side of the stepped portion 40 is connected to the inflow surface 17. Further, the stepped portion 40 has a projecting surface 44 orthogonal to the inflow surface 17 and a stepped portion upper surface 41 extending to the outlet 10 side of the nozzle hole 5. Further, the step portion 40 is formed so as to extend in the first direction X as shown in FIG. That is, the stepped portion 40 is provided so as to extend in the slit-like longitudinal direction of the nozzle hole 5.

The stepped portion upper surface 41 is a flat surface formed so as to extend in the second direction Y from the inlet surface 17 side to the outlet 10 (tip 16) side of the nozzle hole 5. That is, the nozzle portion 4 is formed such that the stepped portion upper surface 41 which is a flat surface is opposed to the upper and lower sides. The stepped portion upper surface 41 is formed in parallel with the inflow surface 17.

In the portion of the stepped portion upper surface 41 in the nozzle portion 4, the opposing upper and lower surfaces in the nozzle hole 5 are parallel, and the height between the upper and lower surfaces in the nozzle hole 5 is kept constant up to the tip 16. That is, the air flow path passing through the step portion 40 to the tip 16 has a fixed shape.

(About air flow)
Next, the flow of air near the wall surface of the nozzle hole 5 involved in noise generation will be described.
A curved surface portion 13 is provided at the inlet of the nozzle hole 5, and the air gradually increased by the curved surface portion 13 reaches the inflow surface 17. Between the end of the curved surface portion 13 and the bottom portion 40b of the stepped portion 40 is an inflow surface 17 that is linear and parallel to the main flow 15, and the air flow 50 in the vicinity of the wall surface of the inflow surface 17 faces the main flow 15. .

At the end of the inflow surface 17 on the outlet 10 side (the bottom 40b of the step 40), there is a step 40 that narrows the flow path of the air. On the inflow surface 17 side of the stepped portion 40, an inclined flow 52 having an angle with the main flow 15 is generated in order to get over the stepped portion 40. A first peeling region 51 is formed at the bottom 40 b of the stepped portion 40. Between the top 40 a of the stepped portion 40 and the tip 16 of the outlet 10 of the nozzle hole 5, there is a stepped portion upper surface 41 that is linear and parallel to the main flow 15.

The inclined flow 52 having an angle with respect to the direction of the main flow 15 cannot flow along the shape of the stepped portion 40, and a second separation region 53 is formed in the vicinity of the wall surface on the top 40 a side of the stepped portion 40. Then, the flow 54 is parallel to the main flow 15 outside the second separation region 53. The second peeling region 53 disappears before the reattachment point 56 in the middle of the stepped portion upper surface 41. Then, the parallel flow 54 on the second peeling region 53 side approaches the wall surface of the nozzle hole 5 at the reattachment point 56.

Between the reattachment point 56 and the tip 16 of the nozzle hole 5, the air flow in the vicinity of the wall surface increases in speed. Here, the pressure in the second peeling region 53 is lower than the surroundings, and the pressure between the reattachment point 56 and the tip 16 is higher than the surroundings. Therefore, the vicinity of the reattachment point 56 has a pressure gradient against the flow, and an increase in the velocity of air near the wall surface from the reattachment point 56 to the tip 16 is suppressed.

[Effects of drying apparatus 200 according to Embodiment 1]
The drying apparatus 200 according to the first embodiment divides the flat portion to form the inflow surface 17 and the stepped portion upper surface 41, and the stepped portion upper surface 41 protrudes toward the center side of the nozzle hole 5 from the inflow surface 17. By doing so, the flow increasing from the curved surface portion 13 toward the outlet (tip 16) of the nozzle hole 5 in the vicinity of the wall surface of the nozzle portion 4 can be decelerated between the inflow surface 17 and the stepped portion upper surface 41. As a result, although the speed is increased again toward the outlet of the nozzle hole 5 on the stepped portion upper surface 41, an increase in speed in the vicinity of the wall surface of the outlet of the nozzle hole 5 is suppressed, and the wall surface of the nozzle hole 5 serving as a noise source and the vicinity of the wall surface are suppressed. The turbulence caused by the difference in speed from the flow of the water can be reduced. Thereby, the drying apparatus 200 which concerns on this Embodiment 1 can aim at reduction of a noise, suppressing the fall of drying performance.

In the noise generated from the nozzle hole, shear force acts on the air flow near the tip of the nozzle hole due to the difference in velocity between the stationary wall surface of the nozzle hole and the air flow having a velocity near the wall surface. Vortex (disturbance) is generated by the shearing force in the inside, and (1) boundary layer noise generated by deformation of the vortex and those vortices generated by being discharged from the downstream outlet of the nozzle hole (2) vortex (3) Jet generated from noise and shear flow in the turbulent diffusion layer caused by the difference in velocity between the main flow of the potential core that is not affected by stirring and the surrounding static air. There is noise.

The drying apparatus 200 according to the first embodiment includes the inflow surface 17 extending along the forming direction of the nozzle hole 5 and the step portion 40 formed so as to protrude from the inflow surface 17. Has a flat surface formed so as to extend from the inflow surface 17 side to the outlet 10 side of the nozzle hole 5. Here, the top 40a of the step and the tip 16 of the nozzle hole 5 are located on the same plane (on the upper surface 41 of the step).
That is, the drying apparatus 200 according to the first embodiment can suppress the speed of the air 55 flowing through the nozzle unit 4 from the reattachment point 56 to the tip 16, thereby generating vortices (turbulence) that are noise sources. Since the strength can be reduced, boundary layer noise and eddy noise generated from the nozzle hole 5 can be suppressed. Therefore, the drying apparatus 200 according to the first embodiment can reduce noise while suppressing a decrease in drying performance.

In addition, the drying apparatus 200 according to the first embodiment can suppress the speed of the air 55 flowing through the nozzle portion 4 from the reattachment point 56 to the tip 16 and release the high pressure in the nozzle hole 5 to the atmosphere. It is possible to suppress fluctuations in the pressure of the air in the vicinity of the tip 16 that generates the largest noise, and noise can be suppressed.

It should be noted that the length of the top 40a and the bottom 40b of the step 40 is preferably 40% or less of the width T1 through which the main flow 15 of the nozzle hole 5 passes. That is, the step portion 40 is formed such that the length between the top portion 40a and the bottom portion 40b, which is the connection portion of the inflow surface 17, is 40% or less of the opposing width T1 of the opposing step portion upper surface 41. It is desirable that When the distance between the top 40a and the bottom 40b of the step 40 is 40% or more of the width T1 through which the main flow passes, the air flow 50 between the top 40a and the bottom 40b of the step 40 on the inflow surface 17 The air volume increases, the speed of the inclined flow 52 increases, and the air hardly flows along the shape of the stepped portion 40. The reattachment point 56 approaches the tip 16 of the nozzle hole 5 as the thickness of the second peeling region 53 increases. The reattachment point 56 has a large pressure fluctuation, and when the pressure fluctuation comes close to the tip 16 of the nozzle hole 5, it becomes a factor that generates a large noise.

Further, it is desirable that the length of the stepped portion upper surface 41 is 20% or more of the length T2 in the main flow 15 direction in which the inflow surface 17 and the stepped portion upper surface 41 are combined. That is, the width in the formation direction of the nozzle hole 5 on the stepped portion upper surface 41 is a width T2 of 20 which is the sum of the width in the nozzle hole 5 forming direction on the stepped portion upper surface 41 and the width of the inflow surface 17 in the nozzle hole forming direction It is desirable that it is formed to be not more than%. When the upper surface 41 of the stepped portion is smaller than 20%, the reattachment point 56 having a large pressure fluctuation approaches the tip 16 of the nozzle hole 5, and when the pressure fluctuation approaches the tip 16 of the nozzle hole 5, a factor that generates a large noise It becomes.

In addition, conventionally, a method of suppressing noise by providing a protrusion on the straight line portion from the inlet of the nozzle hole is disclosed. Since the protrusion and the tip of the nozzle are not on the same plane, a region corresponding to the second separation region of the first embodiment is increased, and noise is suppressed, but a large pressure loss occurs in the flow. Therefore, conventionally, it is necessary to increase the rotational speed (input) of the blower in order to secure a necessary air volume for efficiently drying the hands. As the rotational speed of the blower increases, the noise of the blower increases and the noise of the nozzle hole is suppressed, but the noise reduction effect as a drying device may be reduced.

In the first embodiment, the step portion 40 is described as being formed over the entire width in the first direction X in the nozzle hole 5 of the nozzle portion 4, but is not limited thereto. Absent. It is possible to obtain a noise reduction effect when the stepped portion 40 is formed over the entire width in the first direction X in the nozzle hole 5 of the nozzle portion 4. A part may be interrupted, for example, the level | step-difference part 40 does not need to be formed in the both ends of the nozzle part 4. FIG. Furthermore, even when the nozzles are intermittently arranged in the first direction X as shown in FIG. 10, the same noise reduction effect can be obtained by providing the stepped portion 40.

Moreover, although the nozzle part 4 demonstrated as an example the case where the level | step-difference part 40 was formed in both the inner wall surfaces which oppose in the nozzle hole 5, it is not limited to it. For example, the drying device 200 may be configured such that the stepped portion 40 is formed only on the lower surface shown in FIGS. 3 and 4. However, it is possible to reduce the noise while suppressing the deterioration of the drying performance when formed on both the upper and lower surfaces.

Furthermore, the overall configuration of the drying apparatus 200 according to the first embodiment is not limited to the above, and any configuration that can dry a wet hand by ejecting an air flow from the nozzle hole 5 may be used. . For example, the main body 1 has been described as having the opening 2a and the opening 2b, but these may be closed. Even in the closed mode, it is possible to obtain a drying performance equivalent to that in the case of being opened.

In addition, although the drying apparatus 200 which concerns on this Embodiment 1 demonstrated as the thing in which the inflow surface 17 and the level | step-difference part 40 were integrally formed, a different body may be sufficient. For example, the inflow surface 17 may be formed to extend to the tip 16 side, and the stepped portion 40 may be provided in the extended portion.

[Variation 1 of the drying apparatus 200 according to Embodiment 1]
FIG. 5 shows a first modification of the drying apparatus 200 according to the first embodiment. In the first embodiment, only the case where the shapes of the opposed nozzle holes 5 are symmetrical has been described. However, the present invention is not limited to this. As shown in FIG. 5, the position of the stepped portion 40 B 1 of the lower nozzle portion 4 and the stepped portion 40 B 2 of the upper nozzle portion 4 is located from the inflow surface 17 side to the outlet 10 side of the nozzle hole 5. You may form so that it may shift | deviate to the direction to go.

That is, one inflow surface 17B1 is longer in the Y direction than the other inflow surface 17B2, and accordingly, one stepped portion upper surface 41B1 is more in the Y direction than the other stepped portion upper surface 41B2. The length at may be shorter. Thus, the nozzle part 4B is formed so that the position of the top part 40a is shifted in the direction from the stepped part 40B1 and the stepped part 40B2 side toward the tip 16 side of the nozzle hole 5.

As a result, the flow velocity in the vicinity of the tip 16 can be reduced as described above, and further, a difference occurs in the flow velocity between the tip 16B1 and the tip 16B2 facing each other, so that a shift occurs in the pressure fluctuation period, and the tips 16B1 and 16B2 Since the noise generated in is no longer strengthened, the noise can be further suppressed.

[Modification 2 of drying apparatus 200 according to Embodiment 1]
FIG. 6 is a second modification of the drying apparatus 200 according to the first embodiment. In the first embodiment, the case where the inflow surface 17 and the stepped portion upper surface 41 and the stepped portion 40 are orthogonal to each other has been described. However, the present invention is not limited to this.
As shown in FIG. 6, the stepped portion 40 C of the nozzle portion 4 C has a protruding surface 44 that is connected to the inflow surface 17 at one end and connected to the upper surface 41 at the other end and inclined with respect to the inflow surface 17. It is what. The protruding surface 44C, which is an inclined surface, forms a preset angle between the direction connecting the top 40a and the bottom 40b and the direction of the main flow 15. Thereby, the area | region of the 1st peeling area 51 can be shrunk | reduced and a pressure loss can be suppressed. If the pressure loss can be reduced, the air flow necessary for hand drying can be secured, so that the input and the rotational speed of the air flow generator 6 can be reduced, and noise can be suppressed as the rotational speed decreases.

Embodiment 2. FIG.
FIG. 7 is a front view of a portion of the nozzle hole 5D of the nozzle of the drying apparatus according to the second embodiment. The nozzle hole 5D has a wave shape when viewed from the front. That is, in the first embodiment, the nozzle hole 5 has a straight slit shape, but in the second embodiment, the case where the shape of the opening viewed from the outlet side of the nozzle hole 5D is wavy is described. To do. In the second embodiment, parts similar to those in the first embodiment are denoted by the same reference numerals, and differences will be mainly described.

7A, the nozzle hole 5D is a wavy (substantially sinusoidal) slit having a plurality of peaks and valleys in the left-right direction. Then, as shown in FIG. 7 (b), which is an enlarged view of part A of FIG. 7 (a), the valley portion of the nozzle hole 5D is composed of an upper outline 60a and a lower outline 60b, and is surrounded by the outline 60a. There is a space 61 formed. The crest portion of the nozzle hole 5D is composed of an upper outline 62a and a lower outline 62b, and there is a space 63 surrounded by the outline 62b.

Next, the noise reduction effect by the wavy nozzle hole 5D will be described.
As described above, there are three main sources of noise generated when a high-speed air flow is emitted from the nozzle hole 5D. The first is boundary layer noise generated from the boundary layer formed on the surface of the nozzle hole 5D. The second is vortex noise generated by vortex shedding from the downstream outlet of the nozzle hole 5D. The third is a jet generated from the shear flow of the turbulent diffusion layer generated by the velocity difference between the main flow of the potential core that is not affected by the stirring and the surrounding static air among the air flow discharged from the nozzle hole 5D. Noise.

Here, paying attention to jet noise, the noise can be reduced by reducing the difference in speed between the surrounding stationary air and the high-speed air flow. That is, in the drying apparatus according to the second embodiment, the front view shape of the nozzle hole 5D is wavy, so that the speed difference between the discharged air flow and the surrounding stationary air can be reduced. It has become.

As described above, the nozzle hole 5D in the second embodiment has a wave shape, and includes a space 61 between adjacent mountain portions and a space 63 between adjacent valley portions. For example, in the space 61, energy is supplied by the air flow discharged from the gap between the outer shell 60a and the outer shell 60b of the nozzle hole 5D, and air is induced.

In this case, the velocity of the air flow induced in the space 61 is larger than the velocity of the surrounding space in the case of the linear nozzle hole. As a result, the speed difference between the high-speed air flow directly discharged from the nozzle hole 5D and the air flow in the surrounding space is smaller than in the case of the straight nozzle hole, and the generated jet noise can be suppressed. . Similarly, the air flow in the space 63 has a small speed difference from the air flow directly discharged from the nozzle hole 5D, so that the generated jet noise can be suppressed.

However, since the space around the space 64 below the outer shell 60b is not surrounded by the nozzle hole 5D, the air flow directly discharged from the nozzle hole 5D and the surrounding air flow are the same as in the case of the linear nozzle hole. The speed difference becomes large and noise is not reduced.
However, since the space 61 in which noise is reduced and the space 64 in which noise is not reduced are formed in the vertical direction of the nozzle hole 5D, the phase of the flow change (pressure fluctuation) serving as a noise source is Does not match the direction.
Therefore, the correlation area of sound becomes small and noise can be suppressed. On the other hand, in the case of a linear nozzle hole, the phase of the air flow is the same in both the vertical direction and the width direction of the nozzle hole, and noise increases due to the phase match. Note that the noise state of the space 65 above the outer shell 62a is the same as that of the space 64 described above.

FIG. 8 is a cross-sectional view of A1, A2, and A3 of FIG. Here, A1 is a line passing through the center of the peak portion of the nozzle hole 5D, A2 is a line passing through the boundary between the peak portion and the valley portion, and A3 is a line passing through the center of the valley portion. As shown in FIG. 8, the length (length in the depth direction) of the stepped portion upper surface 41D of the nozzle hole 5D is longer in the order of A1, A2, and A3, and is different in the mainstream 15 direction. That is, the stepped portion upper surface 41D extends from the portion corresponding to the wavy crest of the nozzle hole 5D to the portion facing the wavy trough of the nozzle hole 5D from the inflow surface 17D side to the outlet 10 side (tip) of the nozzle hole 5D. The width in the direction toward (16 side) is increased.

Thereby, the development state of the flow to the tip 16 of the nozzle hole 5D is different, and the velocity distribution in the nozzle hole 5D can be changed in the longitudinal direction of the nozzle hole 5D. As a result, the phase of pressure fluctuation that becomes a sound source of vortex noise generated in the nozzle hole 5D can be shifted in the longitudinal direction of the nozzle hole 5D, the sound correlation area can be reduced, and noise can be suppressed.

[Effects of the drying apparatus according to the second embodiment]
The drying apparatus according to the second embodiment has the following effects in addition to the same effects as the drying apparatus 200 according to the first embodiment. That is, the nozzle hole 5 of the nozzle of the drying apparatus according to the second embodiment has a wave shape when viewed from the front (see FIG. 7). For this reason, the speed difference between the high-speed air flow directly discharged from the nozzle hole 5D and the air flow in the surrounding space is reduced, and the generated jet noise can be suppressed.

Further, in the drying apparatus according to the second embodiment, the length (length in the depth direction) of the stepped portion upper surface 41D of the nozzle hole 5D becomes longer in the order of A1, A2, and A3. For this reason, the development state of the flow up to the tip 16 of the nozzle hole 5D is different, the velocity distribution in the nozzle hole 5D can be changed in the longitudinal direction of the nozzle hole 5D, and the correlation area of sound can be reduced. And noise can be suppressed. As shown in FIG. 11, the same noise reduction effect can be obtained by providing the stepped portion 40 even when the wave-like nozzles are intermittently arranged in the first direction X.

Embodiment 3 FIG.
FIG. 9 is a longitudinal sectional view of the drying device 203 according to the third embodiment. As shown in FIG. 9, the main body 101 forming the outer shell has a hand insertion port 102 on the front surface, and is provided with a hand insertion part 103 as a processing space following the hand insertion port 102 so that a hand can be inserted and removed. .

The manual insertion portion 103 is formed as an open sink-like recess with the front and both sides open at the lower front of the main body 101, and the water receiving portion 104 forming the lower portion and the back side have a curved surface configuration A barrier structure 105 is provided to prevent water from splashing sideways or forward. The bottom of the water receiving portion 104 is inclined downward toward the front, and a drain port 106 is provided at the lower end of the inclination.

A drain container 107 for storing water dripping from the drain port 106 is provided below the water receiving portion 104 so as to be freely inserted and removed. Note that the inner surface of the manual insertion portion 103 is impregnated with a water-repellent coating such as silicon or fluorine, a hydrophilic coating such as titanium oxide, or an antibacterial agent. Thereby, it is possible to reduce the adhesion of dirt to the inner surface of the manual insertion portion 103 and to suppress the growth of bacteria.

An air flow generation unit 108 is incorporated in the main body 101, and includes a DC brushless motor, a drive circuit that drives the DC brushless motor, a turbo fan that is rotated by the DC brushless motor, and the like. Is attached. Here, the case where a DC brushless motor is adopted as the airflow generator 108 has been described as an example, but the present invention is not limited to this, and may be a commutator motor, an induction motor, or the like.

The intake side of the air flow generation unit 108 faces the intake passage 110 having an open lower end provided in the vertical direction on the back side of the main body 101 and in the vicinity of the back side of the hand insertion unit 103. Air can be sucked in through a removable air filter 111 from the lower end of 110.

A plurality of air outlets of the air flow generation unit 108 are opened in the radial direction at intervals in the circumferential direction on the outer periphery of the circular cup-shaped fan casing. The outside of the fan casing is covered by a circular cup-shaped casing 109 provided with a guide path in a direction along the rotational direction of the turbofan, and is sent from the air flow generator 108 to the end of the guide path of the casing 109. A nozzle that converts high-pressure air into a high-speed air flow and blows it out to the manual insertion portion 103 is connected.

The nozzle part 112 is attached to the upper part of the hand insertion part 103 near the hand insertion port so that the nozzle hole 115 faces downward. From the nozzle hole 115 formed in the nozzle portion 112, a high-speed airflow that blows off moisture adhering to the hand inserted into the hand insertion portion 103 is released, and for example, water droplets can be handed without having to slide the hands together. Can be peeled off and blown away from the surface. A hand detection sensor 114 that detects insertion / extraction of the hand is provided behind the nozzle portion 112 so as to face the hand insertion portion 103.

The nozzle holes 115 formed in the nozzle portion 112 are arranged in the X direction of the main body 101 (direction perpendicular to the paper surface of FIG. 9). For example, the nozzle part 112 may use the nozzle part 4 having a rectangular shape in front view described in the first embodiment, or may use the nozzle part 4D having a wavy shape in front view described in the second embodiment. You can also.

The nozzle holes 115 are provided in a plurality of rows in the front-rear direction of the main body 101 (Y direction in FIG. 9). In the third embodiment, a case where two rows of nozzle holes 115 are provided is shown as an example. That is, the nozzle hole 115 has a first nozzle hole 113a and a second nozzle hole 113b. The nozzle holes 115 may be in one row or in three or more rows.

The noise of the drying apparatus 203 having such a configuration is dominated by vortex noise and jet noise generated from the nozzle hole 115 and collision sound generated when the jet collides with the hand insertion portion 103. Therefore, although not shown in FIG. 9, the nozzle portion 4 having the rectangular shape in front view described in the first embodiment is adopted as the nozzle hole 115, or the shape in front view described in the second embodiment is used. By adopting the wavy nozzle portion 4D, it is possible to reduce boundary layer noise, vortex noise, and jet noise generated from the nozzle hole 115. Thereby, the drying apparatus 203 according to the third embodiment can reduce noise while suppressing a decrease in flow rate and a decrease in drying performance.

[Effects of the drying apparatus according to the third embodiment]
The drying apparatus according to the third embodiment has the same effects as the drying apparatus 200 according to the first embodiment and the drying apparatus according to the second embodiment.

1 Main body, 2 Manual insertion part, 2A upper opening part, 2B side opening part, 2C side opening part, 2D inner wall, 2D1 first inner wall, 2D2, second inner wall, 2a opening part, 2b opening part, 4 nozzle part, 4B nozzle part, 4C nozzle part, 4D nozzle part, 4a nozzle part, 4b nozzle part, 5 nozzle hole, 5D nozzle hole, 6 air flow generating part, 7 space, 8 space, 9 suction port, 10 outlet, 13 curved surface part 15 mainstream, 16 tip, 16B1 tip, 16B2 tip, 17 inflow surface, 17B1 inflow surface, 17B2 inflow surface, 17D inflow surface, 30 hand detection sensor, 31 control device, 32 airway member, 32A upstream airway member, 32B Midstream airway member, 32C downstream airway member, 40 stepped portion, 40B1 stepped portion, 40B2 stepped portion, 40C stepped portion, 0a top, 40b bottom, 41 step top surface, 41B1 step top surface, 41B2 step top surface, 41D step top surface, 44 projecting surface, 44C projecting surface, 51 first stripping zone, 53 second stripping zone, 55 air 56, Reattachment point, 60a shell, 60b shell, 61 space, 62a shell, 62b shell, 63 space, 64 space, 65 space, 101 body, 102 hand insertion port, 103 hand insertion portion, 104 water receiving portion, 105 barrier Structure, 106 drain port, 107 drain container, 108 air flow generation part, 109 casing, 110 intake passage, 111 air filter, 112 nozzle part, 113a first nozzle hole, 113b second nozzle hole, 114 hand detection sensor, 115 nozzle hole, 200 drying device, 203 drying device A air passage.

Claims

A body formed with a concave hand insertion portion;
An air flow generator provided in the main body;
Having a nozzle hole through which air fed from the air flow generating part is blown, and a nozzle part formed in the manual insertion part of the main body;
With
The nozzle part is
An inflow surface extending along the forming direction of the nozzle hole;
A step portion provided so as to protrude from the inflow surface,
The upper surface of the stepped portion is
A drying apparatus having a flat surface formed so as to extend from the inflow surface side to the outlet of the nozzle hole.
The inflow surface and the upper surface of the stepped portion are formed in parallel,
The step portion is
2. The drying apparatus according to claim 1, wherein one end side is connected to the inflow surface, the other end side is connected to an upper surface of the stepped portion, and a protruding surface orthogonal to the inflow surface is provided.
The inflow surface and the upper surface of the stepped portion are formed in parallel to each other,
The step portion is
The drying apparatus according to claim 1, wherein one end side is connected to the inflow surface, the other end side is connected to an upper surface of the stepped portion, and a protruding surface is inclined with respect to the inflow surface.
The nozzle part is
The drying apparatus according to any one of claims 1 to 3, wherein the stepped portions are formed on both opposing inner wall surfaces of the nozzle hole.
The stepped portions facing each other are
The drying apparatus according to claim 4, wherein a position of the top portion is formed so as to be shifted in a direction from the inflow surface side toward the outlet side of the nozzle hole.
The step portion is
The length between the top part and the bottom part which is a connection part of the said inflow surface is formed so that it may become 40% or less of the opposing width of the upper surface of the said level | step difference part which opposes. The drying apparatus according to 4 or 5.
The step portion is
The width in the nozzle formation direction on the upper surface of the stepped portion is 20% or less of the total width of the nozzle formation direction on the upper surface of the stepped portion and the width in the nozzle forming direction on the inflow surface. The drying apparatus according to any one of claims 4 to 6, wherein the drying apparatus is formed.
The nozzle hole is
The drying apparatus according to any one of claims 1 to 7, wherein the opening is formed in a wave shape.
The upper surface of the stepped portion is
Formed such that the width in the direction from the inflow surface side toward the outlet side of the nozzle hole increases from the portion corresponding to the wavy crest of the nozzle hole toward the portion facing the wavy trough of the nozzle hole. The drying apparatus according to claim 8, wherein:
The nozzle hole is formed in a long shape,
The drying device according to any one of claims 1 to 9, wherein the stepped portion is formed over the entire width of the nozzle hole in the longitudinal direction.