JP5941665B2 - nozzle - Google Patents

Description

  The present invention relates to a nozzle used in a liquid dispenser that supplies a foam-like liquid.

  As a device for supplying an appropriate amount of liquid from a nozzle that opens downward, a liquid dispenser used for supplying liquid soap in public facilities such as public toilets, hospitals, and restaurants is known (for example, Patent Document 1). reference). Such a liquid dispenser that supplies soap is discharged from the nozzle as a foam by mixing gas with soap in order to improve the convenience of cleaning the soap to be supplied and reducing the amount of soap used. Techniques for doing this are also known.

  However, in a liquid dispenser that supplies soap in the form of foam, after discharging the foamed soap from the nozzle, the foamed soap remains at the tip of the nozzle, and so-called liquid dripping, in which the remaining soap drops over time. There was a problem that it occurred. Therefore, as a device for preventing liquid sag, a technique is known in which a liquid sag prevention device for increasing the inner area of the communication hole through which the soap of the nozzle passes is provided in the communication hole of the nozzle (see, for example, Patent Document 2). ).

JP 2007-098145 A Special table 2011-521755 gazette

  The nozzle used for the liquid dispenser described above has the following problems. That is, in the liquid dispenser described above, a liquid dripping prevention device is provided in the nozzle in order to prevent liquid dripping, and a process of assembling the liquid dripping prevention device in the communication hole of the nozzle is required. Moreover, the structure of the liquid dripping prevention device is complicated. The liquid dripping prevention device has a problem that the structure is complicated and a process for assembling the communication hole is required, so that the manufacturing cost of the liquid dispenser increases.

  Accordingly, an object of the present invention is to provide a nozzle capable of preventing liquid dripping with a simple configuration.

  In order to solve the above problems and achieve the object, the nozzle of the present invention is configured as follows.

As one aspect of the present invention, in a liquid dispenser that supplies liquid in the form of foam, and in the nozzle that discharges the foam-like liquid, a body portion in which a communication hole through which the liquid passes is formed, Formed at the end of the body portion, the flat portion where the communication hole opens, and the surface of the flat portion, provided around the communication hole, and the discharged foam-like liquid is A protruding portion that is inclined at an inclination angle that is movable at a part of the flat portion, and the protruding portion is formed of a curved surface .

  According to the present invention, it is possible to provide a nozzle capable of preventing liquid dripping with a simple configuration.

Explanatory drawing which shows typically the structure of the liquid dispenser which concerns on the 1st Embodiment of this invention. Sectional drawing which shows the structure of the supply apparatus used for the liquid dispenser. The top view which expands and shows the structure of the nozzle used for the supply apparatus. Sectional drawing which expands and shows the structure of the nozzle. Sectional drawing which expands and shows the structure of the nozzle used for the liquid dispenser which concerns on the 2nd Embodiment of this invention.

(First embodiment)
Hereinafter, the configuration of the liquid dispenser 1 using the nozzle 23 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  FIG. 1 is an explanatory view schematically showing a configuration of a liquid dispenser 1 according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a configuration of a supply device 11 used in the liquid dispenser 1, and FIG. FIG. 4 is an enlarged plan view showing the configuration of the nozzle 23 used in the supply device 11, and FIG. 4 is an enlarged sectional view showing the configuration of the nozzle 23.

  As shown in FIG. 1, the liquid dispenser 1 includes an outer member 10, a supply device 11, a drive mechanism 12, a sensor 13, a control unit 14, and a power supply unit 15. The liquid dispenser 1 is provided, for example, in a restroom of a public facility, and is formed so that an appropriate amount of liquid such as foam soap can be supplied. For example, the liquid has a viscosity of 1 to 80 mPa · s at 30 ° C.

  The outer member 10 houses the supply device 11, the drive mechanism 12, the sensor 13, the control unit 14, and the power supply unit 15, and is formed so that a user's hand can be inserted below the supply device 11. The outer member 10 is formed so as to be fixable to a place where the liquid dispenser 1 is installed, for example, a washstand or a wall surface.

  As shown in FIGS. 1 and 2, the supply device 11 is a so-called cartridge formed so as to be detachable from the outer member 10 and capable of supplying a liquid. The supply device 11 includes a tank 21, a supply unit 22, and a nozzle 23. The tank 21 is formed so as to be able to store a liquid liquid therein. The tank 21 is fixed to the supply means 22.

  The supply unit 22 includes a fixed body 31, a movable body 32, a pump unit 33, and a mixing unit 34. The supply means 22 is a pump formed so that the liquid in the tank 21 can be discharged from the nozzle 23 as a foam-like liquid.

  The fixed body 31 is connected to the tank 21. The fixed body 31 is formed so that the pump part 33 and the mixing part 34 can be accommodated therein.

  The movable body 32 has a nozzle 23 formed at the tip thereof. The movable body 32 is formed so as to be detachable from the fixed body 31. Specifically, the movable body 32 is formed so as to be able to reciprocate in a direction away from and in contact with the fixed body 31. The movable body 32 is formed so that the pump part 33 can be driven. The movable body 32 is driven in the direction approaching the fixed body 31 by the drive mechanism 12. The movable body 32 is configured to be movable in a direction away from the fixed body 31 by an urging member described later in the pump unit 33 after being driven toward the fixed body 31 by the drive mechanism 12.

  The pump part 33 is formed so that liquid can be pumped by the reciprocating motion of the movable body 32. The pump unit 33 includes, for example, two valve bodies therein, a pump chamber that temporarily stores liquid from the tank, and an urging member that urges the valve body and the movable body 32. Yes.

  When the supply unit 22 is in a standby state, the pump unit 33 is restricted from moving liquid by the two valve bodies. The pump unit 33 is formed so that when the movable body 32 moves in a direction away from the fixed body 31, one valve body is opened, and a predetermined amount of liquid in the tank 21 is movable in the pump chamber. . The pump unit 33 opens the other valve body when the movable body 32 moves in the direction approaching the fixed body 31, and the liquid in the pump chamber can be mixed with air by the mixing unit 34. The liquid mixed with air is formed so as to be capable of being pumped to the nozzle 23.

  The mixing unit 34 is formed so that air can be mixed with the liquid in the pump chamber when the other valve body of the pump unit 33 is in the open state. The mixing unit 34 mixes air with the liquid to form a foamy liquid.

  The nozzle 23 is formed of, for example, a resin material. The nozzle 23 is formed on the movable body 32. As shown in FIGS. 1 to 4, the nozzle 23 has a cylindrical body portion 41 having a communication hole 42 continuous with the pump portion 33 therein, and a flat surface portion formed at the tip of the body portion 41. 43 and a projecting portion 44 formed on the surface of the flat portion 43 and having the communication hole 42 at the center thereof.

  The nozzle 23 is formed integrally with a body portion 41, a flat surface portion 43, and a protruding portion 44. The nozzle 23 forms a foam-like liquid flow path from the pump part 33 to the outside and a foam-like liquid discharge port by the communication hole 42 of the body part 41.

  The body 41 is formed integrally with the movable body 32. The communication holes 42 are arranged with the same axis, and are formed with different diameters on the pump chamber side and the end. For example, the communication hole 42 is continuously formed by a truncated cone-shaped hole having a large diameter on the fixed body 31 side, a small diameter opening on the tip side at the center of the protruding portion 44, and gradually reducing the diameter. .

  The flat surface portion 43 and the projecting portion 44 constitute an end surface of the body portion 41. The planar portion 43 and the projecting portion 44 are formed so that their surface areas are wider than the opening at the end of the communication hole 42, that is, the opening area that opens to the projecting portion 44 of the communication hole 42. The surface area of the flat portion 43 and the projecting portion 44 is preferably 5 times or more the opening area of the end portion of the communication hole 42, and more preferably 10 times or more.

  The projecting portion 44 is formed with a predetermined inclination angle smaller than 90 degrees with respect to the flat surface portion 43 from the outer peripheral side toward the center side, preferably with an inclination angle of 0 degree or more and 60 degrees or less. That is, the protrusion 44 is an angle that can hold the liquid by the surface tension of the liquid when the liquid adheres to the surface, and does not move as much as possible along the surface in the gravity direction, The liquid is formed at an angle that allows the liquid to move from the protruding portion 44 to the flat portion 43. Here, the inclination angle of 0 degree indicates a configuration including a flat surface without the protruding portion 44.

  Specifically, the protruding portion 44 is a curved surface that is formed by a part of a spherical surface, whose outer surface is within a predetermined inclination angle, and whose height from the flat surface portion 43 is smaller than its radius. The outer surface of the protrusion 44 is a curved surface. Therefore, the predetermined inclination angle means that the curved surface is approximated to an inclined surface at each position, and the approximated inclined surface (so-called tangential plane). And the flat portion 43.

  The protrusion 44 is formed, for example, such that the height t from the flat portion 43 to the crest of the communication hole 42 and the protrusion 44 is equal to or less than ½ of the radius of the spherical surface forming the curved surface. The protrusion 44 has a radius of 4 mm, for example, and a height t from the flat portion 43 to the crest of the communication hole 42 and the protrusion 44 is 1.7 mm.

  The drive mechanism 12 is disposed in the outer member 10 and is connected to the control unit 14 via the signal line S. The drive mechanism 12 moves the movable body 32 in a direction approaching the fixed body 31 based on an instruction from the control unit 14. For example, the drive mechanism 12 is formed so as to be able to press the end surface of the movable body 32, and is configured to be able to release the pressure after moving the movable body 32 to the fixed body 31 in the proximity direction by a predetermined distance. .

  The sensor 13 is provided on the outer member 10 and is connected to the control unit 14 via the signal line S. The sensor 13 is configured to be able to detect that the user's hand is positioned below the nozzle 23 and to transmit the detected information to the control unit 14.

  The control unit 14 is connected to the drive mechanism 12, the sensor 13, and the power supply unit 15 through the signal line S. The control unit 14 supplies the power supplied from the power supply unit 15 to the drive mechanism 12 and the sensor 13. The control unit 14 is configured to be able to drive the drive mechanism 12 after receiving information detected by the sensor 13.

  The power supply unit 15 includes, for example, a dry battery holder and a dry battery provided in the outer member 10. The power supply unit 15 may be a power cable connected to an external power source such as a commercial power source or a household power source.

  In the liquid dispenser 1 configured as described above, when power is supplied from the power supply unit 15 to the control unit 14, first, power is supplied to the sensor 13, and the sensor 13 can always detect the user's hand. Become. When the user's hand is located below the nozzle 23, the sensor 13 detects that the hand is located and transmits detection information to the control unit 14. Upon receiving the detection information from the sensor 13, the control unit 14 supplies power to the drive mechanism 12 to drive based on the information, and moves the movable body 32 by pressing the movable body 32 toward the fixed body 31 by a predetermined distance. Let

  With the movement of the movable body 32, the pump unit 33 pumps the liquid in the pump chamber. At this time, the pumped liquid is mixed with air by the mixing unit 34 to become a foam. An appropriate amount of the foamy liquid passes through the communication hole 42 in the nozzle 23 and is discharged from the tip of the nozzle 23.

  The drive mechanism 12 that has moved the movable body 32 by a predetermined distance releases the pressure on the movable body 32. In addition, the movable body 32 whose pressure is released moves in a direction away from the fixed body 31 by the urging member of the pump unit 33. At this time, in the pump unit 33, a predetermined amount of liquid is sucked into the pump chamber. As a result, the supply device 11 enters a standby state in which it waits until the next drive mechanism 12 is driven. As described above, in the liquid dispenser 1, when the hand is detected by the sensor 13, the control unit 14 drives the supply unit 22 of the supply device 11 with the drive mechanism 12 to supply the bubble-like liquid from the nozzle 23. .

  Next, the liquid in which an appropriate amount is discharged from the tip of the nozzle 23 will be described. When the foam-like liquid is discharged from the communication hole 42 of the nozzle 23 to the external space, it expands slightly due to the difference between the pressure inside the nozzle 23 and the pressure.

  In addition, the foamed liquid discharged in this way generates an adsorption force due to the surface tension due to the intermolecular force (Van der Waals force) that attracts the molecules of the foamy liquid to gather together, and multiple bubbles adsorb to each other. To do. In addition, the foam-like liquid is continued by a plurality of bubbles.

  The foam-like liquid discharged from the communication hole 42 contacts the surface of the protrusion 44 around the end of the communication hole 42 of the nozzle 23 and continuously moves in the direction of gravity. Further, the foam-like liquid is pushed by the foam-like liquid continuously discharged from the communication hole 42, further diffuses from the surface of the protruding portion 44 around the communication hole 42 to the outer peripheral side of the nozzle 23, and the plane portion While contacting a part of 43, it moves continuously in the direction of gravity.

  When an appropriate amount of the foam-like liquid is discharged from the communication hole 42, most of the weight that cannot be supported by the suction force falls in the direction of gravity, and the foam that has not dropped falls on the flat portion 43 by the suction force. And remain on the surface of the protrusion 44.

  The remaining foam-like liquid is freed from the tensile force in the gravitational direction received from the dropped foam due to the falling of the continuous foam, and the surface tension of the nozzle 23 of the flat surface portion 43 is released. It further gradually moves to the outer peripheral side and comes into contact with the flat portion 43 in a wider range than when discharging from the communication hole 42. The remaining foam-like liquid is held by the nozzle 23 in a state where a plurality of bubbles are continuously connected to each other by the mutual adsorption force and are in contact with the flat portion 43 and the protruding portion 44. As a result, the remaining foamy liquid contacts the tip of the nozzle 23 over a wide area, so that it does not drip from the flat portion 43 and the protruding portion 44 due to its own weight, and is held by the flat portion 43 and the protruding portion 44. .

  In addition, the remaining foam-like liquid is in contact with the flat portion 43 and the protruding portion 44 even when the bubbles disappear and becomes liquid as time passes. 44 and is prevented from moving to the tip side of the protrusion 44 as much as possible.

  According to the liquid dispenser 1 configured as described above, the flat portion 43 that forms the end surface of the nozzle 23 and the protruding portion 44 that is formed with a curved surface having a predetermined inclination angle are provided, and the remaining structure is simple. It is possible to prevent the liquid from sagging.

  More specifically, the nozzle 23 is formed in a shape that forms a part of a spherical surface within the range of the inclination angle of the protrusion 44 with respect to the plane portion 43. For this reason, when the bubble-like liquid is discharged from the communication hole 42, the nozzle 23 has a resistance as the protrusion 44, and the area where the bubble-like liquid contacts the flat portion 43 beyond the protrusion 44 is minimized. It becomes possible to do. For this reason, the discharged bubble-like liquid drops with a small amount remaining at the tip of the nozzle 23, and the bubble is well-out, and the amount of liquid remaining in the nozzle 23 can be reduced.

  Further, the nozzle 23 moves the flat portion 43 by the surface tension of the liquid remaining after the discharge, thereby allowing the foam-like liquid to be brought into contact with a larger area than that during the discharge. Since the bubble-like liquid is held by the nozzle 23 in a larger area than that during ejection, the nozzle 23 can prevent the remaining foam-like liquid from dripping, that is, liquid sag.

  The nozzle 23 has a sufficient surface area for holding the liquid by making the surface area of the flat part 43 and the projecting part 44 5 times or more, more preferably 10 times or more the opening area at the projecting part 44 of the communication hole 42. It is possible to secure the liquid, and it is possible to prevent dripping of the liquid as much as possible.

  By making the protruding portion 44 a curved surface, it is possible to reduce the resistance to movement of the foam-like form, and it becomes possible to hold the liquid as much as possible by increasing the surface area. Further, by setting the protrusion 44 to be ½ or less of the radius of the spherical surface, the inclination angle formed by the curved surface can be reduced, and movement due to surface tension is possible as much as possible.

  Further, the protruding portion 44 has a configuration in which the inclination angle gradually decreases from the flat portion 43 side toward the tip thereof (the communication hole 42 and the crest portion of the protruding portion 44). For this reason, even if the liquid liquid adhering to the flat part 43 and the protrusion part 44 moves to the gravitational direction along the surface of the protrusion part 44, the nozzle 23 can hold | maintain the said liquid by the spherical surface below as much as possible. It becomes possible. In addition, the moving speed of the liquid liquid can be reduced. By these things, it becomes possible to reduce the quantity of the liquid which moves to the front-end | tip of the protrusion part 44, and the dripping of the liquid which moved to the said front-end | tip.

  Furthermore, since the nozzle 23 is formed in a cylindrical shape having a communication hole 42 in the inside thereof, and the protruding portion 44 is integrally formed on the flat surface portion 43 of the end surface, the nozzle 23 may have a simple shape. For this reason, even when the nozzle 23 is formed of a resin material, the shape of the mold may be simple, and the manufacturing cost can be reduced. As described above, the nozzle 23 has a configuration in which the flat portion 43 and the protruding portion 44 are provided, so that the nozzle 23 has a simple shape and can prevent dripping without increasing the manufacturing cost.

  As described above, according to the liquid dispenser 1 according to the first embodiment of the present invention, the front end of the nozzle 23 is provided with the flat portion 43 and the protruding portion 44 formed with a curved surface with a predetermined angle. Thus, dripping can be prevented with a simple configuration.

(Second Embodiment)
Next, the configuration of the nozzle 23A used in the liquid dispenser 1 according to the second embodiment of the present invention will be described with reference to FIG.

  FIG. 5 is an enlarged cross-sectional view showing the configuration of the nozzle 23A used in the liquid dispenser 1 according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the structure similar to the nozzle 23 of the liquid dispenser 1 which concerns on 1st Embodiment mentioned above among the structures of the nozzle 23A of the liquid dispenser 1 which concerns on 2nd Embodiment, The detailed Description is omitted. Moreover, since the liquid dispenser 1 which concerns on 2nd Embodiment is the liquid dispenser 1 which concerns on 1st Embodiment mentioned above, and is the structure same except the structure of the nozzle 23A, the detailed description is abbreviate | omitted.

  As shown in FIG. 5, the nozzle 23A is integrally formed with the movable body 32 by, for example, a resin material. The nozzle 23 </ b> A includes a body portion 41 having a communication hole 42 that is continuous with the pump chamber, and a flat surface portion 43 formed at the tip of the body portion 41. That is, the nozzle 23 </ b> A has a configuration in which the protruding portion 44 of the nozzle 23 is 0 degrees, in other words, does not have the protruding portion 44.

  The plane portion 43 is formed so that its surface area is larger than the opening area that opens to the plane portion 43 of the communication hole 42. The surface area of the flat portion 43 is preferably 5 times or more the opening area of the communication hole 42, and more preferably 10 times or more.

  The liquid dispenser 1 configured as described above contacts and adheres to the surface of the flat portion 43 around the communication hole 42 when the foam-like liquid is discharged from the nozzle 23A to the external space. Further, the foam-like liquid is pushed by the foam-like liquid continuously discharged from the communication hole 42, diffuses to the outer peripheral side of the nozzle 23 </ b> A on the surface of the flat portion 43 around the communication hole 42, and in the gravitational direction. Move continuously.

  The foamed liquid thus discharged is continuous with a plurality of bubbles adsorbed to each other, and when a predetermined amount is discharged from the communication hole 42, most of the foamed liquid falls in the direction of gravity. The bubbles that did not fall remain attached to the surface of the flat portion 43 by the adsorption force.

  Further, when the foam-like liquid is discharged from the communication hole 42, it spreads toward the outer peripheral side of the nozzle 23 </ b> A and contacts the flat portion 43. Thereby, a plurality of bubbles are held in the flat portion 43 by the mutual adsorption force of the remaining foam-like liquid.

  Further, the nozzle 23 </ b> A is formed such that the surface area of the flat portion 43, which is the end face thereof, is wider than the flow path area of the communication hole 42. For this reason, the nozzle 23 </ b> A can hold the foamy liquid and the liquid changed from the foamy state to the liquid state in a wide area. Further, since the nozzle 23 </ b> A has a configuration in which the flat portion 43 does not have the protruding portion 44 that protrudes in the direction of gravity, the liquid adhering to the tip of the nozzle 23 </ b> A is positioned on the flat portion 43. In other words, the liquid adhering to the flat part 43 in contact with the flat part 43 does not concentrate on a part of the liquid but is dispersed and positioned on the flat part 43 on average by the surface tension of the liquid. For this reason, it becomes possible to prevent dripping as much as possible.

  According to the liquid dispenser 1 configured as described above, the nozzle 23A has the flat surface portion 43 on the end surface thereof, thereby preventing the liquid from dripping with a simple configuration similar to the nozzle 23 described above. It becomes possible to do.

  Further, since the nozzle 23A is configured not to have the protruding portion 44, the bubble-like liquid can move in the circumferential direction of the nozzle 23A more easily than the nozzle 23, and in the gravity direction of the liquid. Can be prevented from moving.

  In other words, in the nozzle 23 </ b> A, the bubble-like liquid discharged from the communication hole 42 moves to the outer peripheral side of the nozzle 23 having the protrusion 44 described above. For this reason, in the nozzle 23 </ b> A, a foam-like liquid comes into contact with the flat portion 43 with a surface area larger than that of the nozzle 23. As a result, the nozzle 23A is less foamable than the nozzle 23, but the retention power of the remaining foamy liquid is increased.

  In addition, since the liquid in contact with the flat surface can be held, the liquid can be held substantially uniformly on the flat surface portion 43, and dripping of the liquid can be prevented from the nozzle 23. As a result, the nozzle 23 </ b> A can obtain the same effect as the nozzle 23.

  The present invention is not limited to the above embodiment. In the example described above, the liquid used in the liquid dispenser 1 has been described as being soap. However, the present invention is not limited to this, and other liquids may be used as long as the liquid is discharged in the form of bubbles. Moreover, the liquid dispenser 1 mentioned above is not limited to the above-mentioned structure. For example, the liquid dispenser 1 may have a configuration in which the supply device 11 itself does not have the outer member 10 and has the sensor 13 and the control unit 14, and is integrated into a device for supplying tap water. It may be a configuration. That is, the form of the liquid dispenser 1 can be set as appropriate as long as the nozzle 23, 23A or a nozzle having the same configuration as the nozzles 22, 23A is provided at the tip of the supply means 22 that discharges foamy liquid. is there.

Further, in the above-described example, the protruding portion 44 has been described with the configuration in which the communication hole 42 is opened at the tip thereof. The structure which provides the chamfering part to comprise may be sufficient. By providing the chamfered portion, even if a liquid liquid accumulates at the tip of the projecting portion 44, the liquid liquid can be held in a wide area as much as possible, and liquid dripping can be prevented as much as possible. In addition, various modifications can be made without departing from the scope of the present invention.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] A nozzle that is provided in a liquid dispenser that supplies liquid in the form of foam, and that discharges the foam-like liquid,
A body portion formed with a communication hole through which the liquid passes;
A flat surface portion that is formed at an end portion of the body portion and in which the communication hole is opened,
A nozzle comprising:
[2] The nozzle according to [1], wherein the planar portion has a surface area wider than an opening area of the communication hole.
[3] A protrusion that is provided on the surface of the flat portion and is provided around the communication hole and is inclined at an inclination angle at which the discharged bubble-like liquid can move to a part of the flat portion. The nozzle according to [1], further comprising:
[4] The nozzle according to [3], wherein the planar portion and the projecting portion are formed to have a surface area larger than an opening area of the communication hole.
[5] The nozzle according to [4], wherein the protrusion is formed of a curved surface.
[6] The nozzle according to [5], wherein the protrusion is configured by a part of a spherical surface having a predetermined radius.
[7] The nozzle according to [6], wherein the protrusion has a height from the flat portion that is ½ or less of a radius thereof.
[8] The nozzle according to [3], wherein the inclination angle is an angle of 0 degrees to 60 degrees with respect to the planar portion.

  DESCRIPTION OF SYMBOLS 1 ... Liquid dispenser, 10 ... Outer member, 11 ... Supply apparatus, 12 ... Drive mechanism, 13 ... Sensor, 14 ... Control part, 15 ... Electric power supply part, 21 ... Tank, 22 ... Supply means, 23 ... Nozzle, 31 ... Fixed body, 32 ... movable body, 33 ... pump part, 34 ... mixing part, 41 ... trunk part, 42 ... communication hole, 43 ... flat part, 44 ... projecting part, S ... signal line.

Claims (6)

Provided in a liquid dispenser that supplies liquid in the form of foam, in the nozzle for discharging the foam-like liquid,
A body portion formed with a communication hole through which the liquid passes;
A flat surface portion that is formed at an end portion of the body portion and in which the communication hole is opened,
A protrusion that is a surface of the flat part and is provided around the communication hole and is inclined at an inclination angle at which the discharged foamy liquid can move to a part of the flat part;
With
The nozzle is characterized in that the protrusion is formed of a curved surface .   2. The nozzle according to claim 1, wherein the planar portion has a surface area wider than an opening area of the communication hole. 2. The nozzle according to claim 1 , wherein the planar portion and the protruding portion have a surface area wider than an opening area of the communication hole. The nozzle according to claim 1 , wherein the protruding portion is configured by a part of a spherical surface having a predetermined radius. The nozzle according to claim 4 , wherein the protrusion has a height from the flat portion that is ½ or less of a radius thereof. The nozzle according to claim 1 , wherein the inclination angle is an angle of not less than 0 degrees and not more than 60 degrees with respect to the planar portion.

Images