Liquid injection nozzle and liquid injection device

Abstract

To inhibit a nozzle plate from being deformed by a pressure applied to the nozzle plate when a liquid is jetted from a nozzle hole.SOLUTION: A liquid jet nozzle 3 has a nozzle hole 321 and jets a liquid from the nozzle hole 321 in a jet direction D toward an object. The liquid jet nozzle 3 includes: a nozzle plate 32 provided with the nozzle hole 321; and a pressing member 33 which has a through hole 331 having a diameter L2 larger than a diameter L1 of the nozzle hole 321 at a position corresponding to the nozzle hole 321 in the jet direction D and presses the nozzle plate 32 from the downstream side as seen in the jet direction D.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a liquid ejection nozzle and a liquid ejection apparatus. [Background technology]

[0002] Conventionally, liquid injection nozzles that inject liquid from a nozzle hole toward a target object have been used. For example, Patent Document 1 discloses a handpiece capable of spraying a fluid jet from a nozzle element. The handpiece of Patent Document 1 is an example of a liquid injection nozzle that injects liquid from a nozzle hole toward a target object, but liquid injection nozzles that inject liquid from a nozzle hole toward a target object like this have various configurations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-103173 A Summary of the Invention [Problem to be solved by the invention]

[0004] A liquid injection nozzle that injects liquid from a nozzle hole toward a target object can be configured such that a nozzle hole is formed in a nozzle plate and liquid is injected from the nozzle hole of the nozzle plate toward the target object. With such a configuration, a highly accurate liquid injection nozzle can be easily manufactured. However, in a liquid injection nozzle configured in this way, there is a risk that the nozzle plate will be deformed by the pressure applied to the nozzle plate when liquid is injected from the nozzle hole. Therefore, an object of the present invention is to suppress deformation of the nozzle plate due to the pressure applied to the nozzle plate when liquid is injected from the nozzle hole. [Means for solving the problem]

[0005] The liquid injection nozzle of the present invention, which solves the above problem, is a liquid injection nozzle having a nozzle hole and ejecting liquid from the nozzle hole in a jet direction toward a target, and is characterized in that it comprises a nozzle plate in which the nozzle hole is provided, and a pressing member which has a through hole of a diameter larger than the diameter of the nozzle hole at a position corresponding to the nozzle hole in the jet direction and which presses the nozzle plate from the downstream side in the jet direction. [Brief description of the drawings]

[0006] [Figure 1] 1 is a schematic diagram of an entire liquid ejecting device having a liquid ejecting nozzle according to a first embodiment of the present invention. [Diagram 2] 2 is a schematic perspective view of the liquid supply device in the liquid ejecting apparatus of FIG. 1, seen from the front side, showing a state in which a lid portion is closed. FIG. [Diagram 3] 2 is a schematic perspective view of a liquid supply device in the liquid ejecting apparatus of FIG. 1, seen from the rear side. [Figure 4] FIG. 2 is a schematic perspective view of a liquid ejection nozzle in the liquid ejection device of FIG. [Diagram 5] 5 is a schematic perspective view of a liquid ejection nozzle in the liquid ejection device of FIG. 1, seen from a different direction than that of FIG. 4. [Figure 6] 2 is a perspective cross-sectional view of a tip portion of a liquid ejection nozzle in the liquid ejection device of FIG. 1. [Figure 7] FIG. 7 is a cross-sectional view of a nozzle unit of the liquid injection nozzle of FIG. 6. [Figure 8] FIG. 8 is an enlarged view of the nozzle plate and its periphery of the nozzle unit in FIG. 7. [Figure 9] 5A and 5B are schematic diagrams for explaining the arrangement relationship between nozzle holes of a nozzle plate and through holes of a pressing member. [Figure 10] 13 is a diagram showing a nozzle hole of a nozzle plate and a through hole of a pressing member of a liquid ejection nozzle according to a second embodiment of the present invention, as viewed from the ejection direction. [Figure 11] 6 is a cross-sectional view illustrating a nozzle hole of a nozzle plate and a through hole of a pressing member of a liquid ejecting nozzle according to a second embodiment of the present invention. [Figure 12]13 is a diagram showing a nozzle hole of a nozzle plate and a through hole of a pressing member of a liquid ejection nozzle according to a third embodiment of the present invention, as viewed from the ejection direction. [Figure 13] 11 is a cross-sectional view illustrating a nozzle hole of a nozzle plate and a through hole of a pressing member of a liquid ejecting nozzle according to a third embodiment of the present invention. [Figure 14] FIG. 11 is a schematic cross-sectional view of an entire liquid ejecting device having a liquid ejecting nozzle according to a fourth embodiment of the present invention. [Figure 15] FIG. 11 is a cross-sectional view of a valve applicable to a liquid injection nozzle according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] First, the present invention will be briefly described. In order to solve the above problem, a first aspect of the liquid injection nozzle of the present invention is a liquid injection nozzle having a nozzle hole and ejecting liquid from the nozzle hole in a jet direction toward a target object, characterized in that it comprises a nozzle plate in which the nozzle hole is provided, and a pressing member which has a through hole having a diameter larger than that of the nozzle hole at a position corresponding to the nozzle hole in the jet direction and which presses the nozzle plate from the downstream side in the jet direction.

[0008] According to this aspect, the nozzle plate has a through hole having a diameter larger than that of the nozzle hole at a position corresponding to the nozzle hole in the ejection direction, and is provided with a pressing member that presses the nozzle plate from the downstream side in the ejection direction, so that when liquid is ejected from the nozzle hole, the pressing member can suppress deformation of the nozzle plate due to pressure applied to the nozzle plate without interfering with the ejection of liquid from the nozzle hole.

[0009] The liquid jet nozzle of a second aspect of the present invention is the liquid jet nozzle of the first aspect, characterized in that the nozzle plate is provided with a plurality of the nozzle holes.

[0010] According to this aspect, the nozzle plate is provided with a plurality of nozzle holes, which allows the diameter of each nozzle hole to be small without reducing the amount of liquid ejected, making it possible to eject a sufficient amount of liquid at high speed.

[0011] The liquid jet nozzle of a third aspect of the present invention is the liquid jet nozzle of the second aspect, characterized in that the through holes are provided one for each of the nozzle holes.

[0012] If the through holes are too large, there is a risk that the effect of the pressing member in pressing the nozzle plate will decrease. However, according to this embodiment, one through hole is provided corresponding to each nozzle hole. Therefore, it is possible to prevent each through hole from becoming too large, and to prevent a decrease in the effect of the pressing member in pressing the nozzle plate.

[0013] The liquid jet nozzle of a fourth aspect of the present invention is the liquid jet nozzle of the second aspect, characterized in that one through hole is provided corresponding to the plurality of nozzle holes.

[0014] According to this aspect, one through hole is provided corresponding to a plurality of nozzle holes, so that the number of through holes can be reduced and the pressing member having the through holes can be easily manufactured.

[0015] The liquid ejecting nozzle of a fifth aspect of the present invention is any one of the first to fourth aspects, characterized in that the pressing member is configured to be detachable from the nozzle plate.

[0016] According to this aspect, the pressing member is configured to be detachable from the nozzle plate, which makes it easy to replace or clean the pressing member.

[0017] The liquid jet nozzle of a sixth aspect of the present invention is the liquid jet nozzle of any one of the first to fifth aspects, characterized in that the pressing member is formed to contain a resin.

[0018] According to this aspect, the pressing member is configured to contain resin. Since resin can be easily changed in shape, the pressing member having the through hole can be easily manufactured using resin.

[0019] The liquid ejecting nozzle of a seventh aspect of the present invention is the liquid ejecting nozzle of any one of the first to sixth aspects, characterized in that the pressing member has a through hole subjected to a liquid repellent treatment with respect to the liquid.

[0020] According to this aspect, the through holes of the pressing member are treated to be liquid repellent, which makes it possible to suppress a decrease in ejection accuracy due to the liquid wetting and spreading in the through holes and receiving a force from the through holes when ejecting the liquid.

[0021] The liquid jet nozzle of an eighth aspect of the present invention is the liquid jet nozzle of any one of the first to seventh aspects, characterized in that a diameter of the through hole is equal to or smaller than a thickness of the pressing member in the jetting direction.

[0022] According to this aspect, the diameter of the through hole is equal to or smaller than the thickness of the pressing member in the ejection direction, which makes it possible to suppress a decrease in the effect of the pressing member in pressing the nozzle plate, which would otherwise be caused by the diameter of the through hole becoming too large or the thickness of the pressing member becoming too small.

[0023] A liquid ejection device according to a ninth aspect of the present invention is characterized by comprising: a liquid ejection nozzle according to any one of the first to eighth aspects; and a liquid supply device that supplies the liquid to the liquid ejection nozzle.

[0024] According to this aspect, when liquid is ejected from the nozzle holes, it is possible to suppress deformation of the nozzle plate due to pressure applied to the nozzle plate without impeding ejection of liquid from the nozzle holes.

[0025] The liquid ejecting apparatus of a tenth aspect of the present invention is the liquid ejecting apparatus of the ninth aspect, characterized in that the liquid supplying device sends the liquid to the liquid ejecting nozzle by using gas pressure.

[0026] According to this aspect, the liquid can be easily sent to the liquid ejection nozzle by using gas pressure.

[0027] [Example 1] Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. Here, the liquid ejection device 1 will be described as a liquid ejection device for facial skin. It is needless to say that the liquid ejection device 1 is not limited to being used for facial skin, and can be applied to, for example, washing the skin of arms, hands, feet, back, etc., and can also be applied to washing objects other than living bodies.

[0028] First, an overview of a liquid injection device 1 of this embodiment will be described with reference to Figures 1 to 5. The liquid injection device 1 of this embodiment cleanses the skin of the face, etc. with liquid injected from a liquid injection nozzle 3. Specifically, the liquid injection device 1 of this embodiment includes a liquid injection nozzle 3 that injects liquid, and a liquid supply device 2.

[0029] 1, the liquid supplying device 2 includes a lid portion 4, an operation portion 5, a liquid storage portion 6 that stores the liquid to be sprayed, and a liquid supply path 10 that connects the liquid storage portion 6 and the liquid ejection nozzle 3. The lid portion 4 can be displaced between an open state as shown in Fig. 1 and a closed state as shown in Figs. 2 and 3 by rotating about a rotation shaft portion 4a. A pump (not shown) is provided inside the liquid supplying device 2, and the liquid can be supplied from the liquid storage portion 6 to the liquid ejection nozzle 3 via the liquid supply path 10 by the pressure of the pump.

[0030] 1, 4 and 5, the liquid injection nozzle 3 includes a handpiece unit 13 and a nozzle unit 23. The handpiece unit 13 is provided with a switch 13a, and when the user turns on the switch 13a, liquid is injected from the nozzle unit 23, and when the user turns off the switch 13a, injection of liquid from the nozzle unit 23 stops.

[0031] Next, the nozzle unit 23 of the liquid ejection device 1 of this embodiment will be described in detail with reference to Figs. 6 to 9. As shown in Fig. 6, the nozzle unit 23 is attached to the tip of the handpiece unit 13. Specifically, as shown in Fig. 6, the tip of the handpiece unit 13 is provided with a male screw portion 131 having a liquid flow path 131a formed therein. As shown in Figs. 6 and 7, a male screw portion attachment portion 311 having a female screw portion 311a is formed inside a base portion 31 of the nozzle unit 23, and the nozzle unit 23 is attached to the tip of the handpiece unit 13 by fitting the male screw portion 131 into the female screw portion 311a. Here, the tip means the tip in the ejection direction D of the liquid shown in Fig. 7. In this embodiment, the nozzle unit 23 is attached to the handpiece unit 13 by fitting the male screw portion 131 into the female screw portion 311a, but the present invention is not limited to this configuration, and for example, a convex portion and a concave portion may be provided on the nozzle unit 23 and the handpiece unit 13, and a snap fit may be used in which the convex portion is hooked onto the concave portion. Note that the nozzle hole 321 and the through hole 331 are too small to be visible to the naked eye, and therefore are not shown in FIG. 4.

[0032] 7 and 8, a nozzle plate 32 is fixed to the tip side of the base 31. There is no particular limitation on the method of fixing the nozzle plate 32 to the base 31. The nozzle plate 32 is provided with a nozzle hole 321. A groove 312 is formed in the base 31 in an annular shape as viewed from the jetting direction D, and an O-ring 34 is disposed in the groove 312 as a sealing member. This configuration prevents liquid from leaking out of the O-ring 34 through a gap between the base 31 and the nozzle plate 32 in a direction intersecting with the jetting direction D. This embodiment uses the O-ring 34 to avoid the use of an adhesive and to prevent the elution of the adhesive, but is not limited to this configuration. The O-ring 34 can be made of fluororubber, silicone rubber, or EPDM to prevent the elution from the O-ring 34.

[0033] 7 and 8, a pressing member 33 is fixed to the tip side of the nozzle plate 32. In this embodiment, the pressing member 33 is engaged with the base 31 by an engagement portion (not shown) to fix the pressing member 33 to the tip side of the nozzle plate 32, but there is no particular limitation on the method of fixing the pressing member 33 to the base 31 or the nozzle plate 32. As shown in FIGS. 6 to 9, a through hole 331 is formed at a position corresponding to the nozzle hole 321 in the pressing member 33, that is, at a position on an extension line downstream of the nozzle hole 321 in the injection direction D. Since the liquid injection nozzle 3 is configured in this way, the liquid supplied to the liquid injection nozzle 3 from the liquid supply device 2 is injected toward the injection direction D in FIG. 7 through the liquid flow path inside the handpiece unit 13, the liquid flow path 131a, the space portion of the male screw portion attachment portion 311, the nozzle hole 321, and the through hole 331.

[0034] As shown in FIG. 8, the diameter L2 of the through hole 331 is sufficiently larger than the diameter L1 of the nozzle hole 321, so that the liquid ejected from the nozzle hole 321 does not come into contact with the through hole 331. As shown in FIG. 8, the thickness T2 of the pressing member 33 in the ejection direction D is sufficiently larger than the thickness T1 of the nozzle plate 32, so that the pressing member 33 has high rigidity. Here, "the thickness T2 of the pressing member 33 is sufficiently larger than the thickness T1 of the nozzle plate 32" can be, for example, 10 times or more the thickness T1 of the nozzle plate 32. Therefore, when ejecting liquid from the nozzle hole 321, a force is applied to the nozzle plate 32 in the ejection direction D, but the pressing member 33 can firmly press the nozzle plate 32.

[0035] As described above, the liquid injection nozzle 3 of this embodiment is a liquid injection nozzle that has a nozzle hole 321 and injects liquid from the nozzle hole 321 in an injection direction D toward a target such as the skin. The liquid injection nozzle 3 of this embodiment is equipped with a nozzle plate 32 in which the nozzle hole 321 is provided, and a pressing member 33 that has a through hole 331 with a diameter larger than the diameter of the nozzle hole 321 at a position corresponding to the nozzle hole 321 in the injection direction D and that presses the nozzle plate 32 from the downstream side in the injection direction D.

[0036] As described above, the liquid jet nozzle 3 of this embodiment includes the pressing member 33 that presses the nozzle plate 32 from the downstream side in the jetting direction D. This makes it possible to suppress deformation of the nozzle plate 32 due to pressure applied to the nozzle plate 32. Furthermore, the diameter L2 of the through hole 331 of the pressing member 33 is larger than the diameter L1 of the nozzle hole 321. Therefore, the liquid jet nozzle 3 of this embodiment can suppress the pressing member 33 from interfering with the jetting of liquid from the nozzle hole 321 when jetting liquid from the nozzle hole 321.

[0037] Here, a preferred range of diameter L2 of through hole 331 will be described with reference to Fig. 9. The diagram on the left side of Fig. 9 shows an example in which diameter L2 of through hole 331 is in the preferred range of diameter L2a, and the diagram on the right side of Fig. 9 shows an example in which diameter L2 of through hole 331 is in the preferred range of diameter L2b. Note that diameter L1 of nozzle hole 321 corresponds to the diameter of the liquid to be ejected, and can be set appropriately depending on the application.

[0038] In FIG. 9, the maximum jetting direction deviation from the predetermined jetting direction D in the liquid jet nozzle 3 of this embodiment is the inclination angle Θ. The inclination angle Θ is preferably 0°, but may be, for example, about 2° due to manufacturing tolerances. In the left diagram of FIG. 9, the diameter L2 of the through hole 331 is the diameter L2a. The diameter L2a is a size such that the liquid does not come into contact with the through hole 331 even when the liquid jetted from the nozzle hole 321 is jetted at the inclination angle Θ that causes the maximum jetting direction deviation. For this reason, in the case of the diameter L2 as shown in the left diagram of FIG. 9, even when the liquid jetted from the nozzle hole 321 is jetted at the inclination angle Θ that causes the maximum jetting direction deviation, the liquid is jetted without interfering with the through hole 331. Note that the relational expression for preventing the liquid from coming into contact with the through hole 331 can be expressed as the following Equation 1 using the inclination angle Θ, the diameter L1 of the nozzle hole 321, the diameter L2 of the through hole 331, and the thickness T2 of the pressing member 33. (Formula 1) Θ <tan -1 (((L2-L1) / 2) / T2)

[0039] On the other hand, in the diagram on the right side of Fig. 9, the diameter L2 of the through hole 331 is set to a diameter L2b. The diameter L2b is set to a size such that when the liquid jetted from the nozzle hole 321 is jetted at an inclination angle Θ causing the maximum jetting direction deviation, the liquid comes into contact with the tip portion 331a of the through hole 331. In the case of the diameter L2 as shown in the diagram on the right side of Fig. 9, when the liquid jetted from the nozzle hole 321 is jetted at an inclination angle Θ causing the maximum jetting direction deviation, the liquid is jetted due to interference with the through hole 331. When the liquid is jetted due to interference with the through hole 331, this may cause jetting failure and may cause the through hole 331 to become wet, making it easier for foreign matter to adhere to the through hole 331.

[0040] For this reason, it is preferable that the diameter L2 of the through hole 331 is large enough that even when the liquid ejected from the nozzle hole 321 is ejected at an inclination angle Θ causing the maximum ejection direction deviation, the liquid does not come into contact with the through hole 331. Note that the size at which the liquid does not come into contact with the through hole 331 varies depending on the thickness T2 of the pressing member 33, and therefore the preferable lower limit of the diameter L2 of the through hole 331 also varies depending on the thickness T2 of the pressing member 33.

[0041] Furthermore, a preferred upper limit of the diameter L2 of the through hole 331 is equal to or less than the thickness T2 of the pressing member 33 in the ejection direction D. If the diameter of the through hole 331 becomes too large, or if the thickness T2 of the pressing member 33 becomes too small, the effect of the pressing member 33 in pressing the nozzle plate 32 decreases. However, by setting the diameter L2 of the through hole 331 to be equal to or less than the thickness T2 of the pressing member 33 in the ejection direction D, it is possible to suppress a decrease in the effect of the pressing member 33 in pressing the nozzle plate 32.

[0042] In this embodiment, the inclination angle Θ, which is a deviation from the predetermined ejection direction D, is allowed up to 2°. In this way, it is particularly preferable to set the inclination angle Θ to 2° or less. At least, it is preferable that the allowed inclination angle Θ is 45° or less, and correspondingly, the diameter of the through hole is preferably a diameter that does not allow the through hole 331 to come into contact with the liquid even if the inclination angle Θ deviates from the predetermined ejection direction D by 45°. Note that the upper limit of the diameter L2 of the through hole 331 when the allowed inclination angle is 45° and the diameter that does not allow the through hole 331 to come into contact with the liquid is the same length as the thickness T2 of the pressing member 33.

[0043] Here, the pressing member 33 is configured to be detachable from the nozzle plate 32. Therefore, the pressing member can be easily replaced or cleaned. In this embodiment, the liquid ejecting device 1 can be used even in a state where the pressing member 33 is detached from the nozzle plate 32. However, this is not limited to such a configuration. For example, the pressing member 33 and the nozzle plate may be molded integrally, such as by insert molding.

[0044] Moreover, in the liquid injection nozzle 3 of this embodiment, the pressing member 33 is entirely made of resin. In this way, it is preferable that the pressing member 33 is made of resin. This is because the shape of resin can be easily changed, and therefore the pressing member 33 having the through hole 331 can be easily manufactured using resin. In addition, resin has the advantage of being less susceptible to corrosion.

[0045] Furthermore, in the liquid jet nozzle 3 of this embodiment, the through hole 331 of the pressing member 33 is treated to be liquid repellent against liquid. Therefore, when the liquid is jetted, it is possible to suppress a decrease in jetting accuracy due to the liquid spreading in the through hole 331 and receiving a force from the through hole 331. Note that there is no particular limitation on the method of the liquid repellent treatment, but examples include coating the through hole 331 with a fluorine compound.

[0046] 8, in the liquid ejection nozzle 3 of this embodiment, the pressing member 33 has a chamfered tip portion 331a of the through hole 331. By chamfering the tip portion 331a of the through hole 331 in this manner, when the user uses the liquid ejection device 1 of this embodiment, sebum and the like are less likely to adhere to the through hole 331. However, this is not limited to such a configuration.

[0047] [Example 2] Next, the liquid injection device 1 of the second embodiment will be described with reference to Figures 10 and 11. In Figures 10 and 11, components common to the first embodiment are indicated by the same reference numerals, and detailed description will be omitted. The liquid injection device 1 of the second embodiment has the same features as the liquid injection device 1 of the first embodiment described above, and has the same configuration as the liquid injection device 1 of the first embodiment except for the points described below. Specifically, except for having a plurality of nozzle holes 321 and through holes 331, it has the same configuration as the liquid injection device 1 of the first embodiment.

[0048] 10 and 11, in the liquid injection nozzle 3 of the liquid injection device 1 of this embodiment, a plurality of nozzle holes 321 are provided in the nozzle plate 32. Therefore, the diameter of each nozzle hole 321 can be made small without reducing the injection amount of liquid, and a sufficient amount of liquid can be injected at high speed. This is because, when the liquid is injected with the same pressure, the liquid can be injected at a higher speed by making the diameter of the nozzle hole 321 smaller.

[0049] 10 and 11, in the liquid injection nozzle 3 of the liquid injection device 1 of this embodiment, one through hole 331 is provided corresponding to each nozzle hole 321. If the diameter L2 of the through hole 331 becomes too large, there is a risk that the effect of the pressing member 33 in pressing the nozzle plate 32 will decrease. However, as described above, in the liquid injection nozzle 3 of this embodiment, one through hole 331 is provided corresponding to each nozzle hole 321. Therefore, it is possible to prevent each through hole 331 from becoming too large, and to prevent a decrease in the effect of the pressing member 33 in pressing the nozzle plate 32.

[0050] [Example 3] Next, the liquid injection device 1 of the third embodiment will be described with reference to Figs. 12 and 13. Figs. 12 and 13 correspond to Figs. 10 and 11 of the liquid injection device 1 of the second embodiment. In Figs. 12 and 13, components common to the first and second embodiments are indicated by the same reference numerals, and detailed description will be omitted. The liquid injection device 1 of the present embodiment has the same features as the liquid injection device 1 of the first and second embodiments described above, and has the same configuration as the liquid injection device 1 of the first and second embodiments except for the points described below. Specifically, it has the same configuration as the liquid injection device 1 of the first embodiment except for the shape of the through hole 331 and the fact that it has a plurality of nozzle holes 321.

[0051] 12 and 13, in the liquid jet nozzle 3 of this embodiment, similar to the liquid jet nozzle 3 of embodiment 2, a plurality of nozzle holes 321 are provided in the nozzle plate 32. Therefore, the diameter of each nozzle hole 321 can be reduced without reducing the amount of liquid jetted, and a sufficient amount of liquid can be jetted at high speed.

[0052] 12 and 13, in the liquid jet nozzle 3 of this embodiment, one through hole 331 is provided corresponding to the plurality of nozzle holes 321. In this way, by reducing the number of through holes 331, the pressing member 33 having the through hole 331 can be easily manufactured. In addition, it is also possible to narrow the interval between the nozzle holes 321.

[0053] 12, the through hole 331 in this embodiment is configured such that the wall portion 331b protrudes toward the center so as to make the opening area as small as possible while ensuring a predetermined distance from the nozzle hole 321 when viewed from the ejection direction D. This configuration prevents the through hole 331 from becoming too large, and prevents a decrease in the effect of the pressing member 33 in pressing the nozzle plate 32. However, this is not limited to the configuration, and for example, the wall portion 331b of the through hole 331 may be configured in a circular shape when viewed from the ejection direction D.

[0054] In the configuration of this embodiment, it is preferable to prevent the liquids ejected from adjacent nozzle holes 321 from interfering with each other even if they deviate from the predetermined ejection direction D. As described above, there are cases in which the liquid is ejected deviating from the predetermined ejection direction D due to manufacturing tolerances, etc., but the interval between adjacent nozzle holes 321 that can suppress interference between the liquids ejected from adjacent nozzle holes 321 varies depending on the thickness T2 of the pressing member 33. For example, if the thickness T2 of the pressing member 33 is 10 mm, and the inclination angle Θ from the predetermined ejection direction D is 1.4° or more, it is preferable that the interval between adjacent nozzle holes 321 be 0.25 mm or more.

[0055] Conversely, when the thickness T2 of the pressing member 33 is 10 mm, and the interval between adjacent nozzle holes 321 is 0.25 mm, it is preferable to keep the inclination angle Θ from the predetermined jetting direction D to 1.4° or less. Similarly, when the thickness T2 of the pressing member 33 is 10 mm, and the interval between adjacent nozzle holes 321 is 0.5 mm, it is preferable to keep the inclination angle Θ from the predetermined jetting direction D to 2.9° or less, and when the interval between adjacent nozzle holes 321 is 1.0 mm, it is preferable to keep the inclination angle Θ from the predetermined jetting direction D to 3.8° or less, and when the interval between adjacent nozzle holes 321 is 1.5 mm, it is preferable to keep the inclination angle Θ from the predetermined jetting direction D to 5.7° or less.

[0056] [Example 4] Next, the liquid injection device 1 of the fourth embodiment will be described with reference to Figures 14 and 15. In Figures 14 and 15, components common to the first to third embodiments are indicated by the same reference numerals, and detailed description will be omitted. Here, the liquid injection device 1 of this embodiment is configured to deliver the liquid sealed inside a container by gas pressure.

[0057] 14, the liquid supplying device 2 of this embodiment is an aerosol canister, and is filled with highly compressed nitrogen gas N and liquid L. The liquid L is supplied to the liquid injection nozzle 3, which is an actuator, via a liquid supply path D and a valve B by the pressure of the nitrogen gas N inside the liquid supplying device 2. The gas filled in the aerosol canister is not limited to compressed gas such as nitrogen or carbon dioxide, and may be a liquefied gas such as dimethyl ether or liquefied natural gas.

[0058] When the user presses down on the liquid ejection nozzle 3, which is an actuator, the valve B opens and the liquid L is ejected from the nozzle hole 321. When the user releases the liquid ejection nozzle 3, which is an actuator, the valve B blocks the flow path of the liquid L and the ejection of the liquid L from the nozzle hole 321 stops.

[0059] Here, in the liquid supply device 2 of this embodiment, the nozzle unit 23 is attached to the valve B by press-fitting. However, in order to prevent disassembly or modification of the nozzle unit 23, the nozzle unit 23 may be bonded to the valve B. Also, the liquid injection nozzle 3 of this embodiment has a structure having a nozzle plate 32, and is structured such that the pressing member 33 can be removed and the nozzle plate 32 can be assembled and replaced. However, this is not limited to such a structure, and may be structured such that the nozzle plate 32 is integrally molded with the liquid injection nozzle 3 which is an actuator, or structured such that the nozzle plate 32 and the pressing member 33 are integrally molded with the liquid injection nozzle 3 which is an actuator, or structured such that a part formed by unitizing the nozzle plate 32 is press-fitted or fitted into the actuator, or the like.

[0060] 15 is an example of the valve B in the liquid injection device 1 of FIG. 14. As shown in FIG. 15, the valve B of this embodiment has a housing 300 having a housing hole 301 and a spring S therein. It also has a stem 302 pressed by the spring S and a stem gasket 303 that presses the stem 302. When the user presses down on the liquid injection nozzle 3, the stem 302 moves down, creating a gap between the stem gasket 303 and the stem 302, and the liquid supply path D opens. When the user opens the liquid injection nozzle 3, the stem 302 is pressed upward by the spring S, eliminating the gap between the stem gasket 303 and the stem 302, and the liquid supply path D is closed.

[0061] The present invention is not limited to the above-mentioned embodiments, and can be realized in various configurations without departing from the spirit of the present invention. The technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0062] 1...liquid ejection device, 2...liquid supply device, 3...liquid ejection nozzle, 4...lid portion, 4a...rotating shaft portion, 5...operation portion, 6...liquid storage portion, 10...liquid supply path, 13...handpiece unit, 113a...switch, 23...nozzle unit, 31...base portion, 32...nozzle plate, 33...pressing member, 34...O-ring, 131...male thread portion, 131a...liquid flow path, 300...housing, 301...housing hole, 302...stem, 303...stem gasket, 311...male thread mounting portion, 311a...female thread portion, 312...groove portion, 321...nozzle hole, 331...through hole, 331a...tip portion, 331b...wall portion, D...liquid supply path, L...liquid, L1...diameter, L2...diameter, L2a...diameter, L2b...diameter, N...nitrogen gas, T1...thickness, T2...thickness, S...spring, Θ...tilt angle

Claims

1. A liquid injection nozzle having a nozzle hole and injecting liquid from the nozzle hole in an injection direction toward a target, a nozzle plate in which the nozzle holes are provided; a pressing member having a through hole having a diameter larger than a diameter of the nozzle hole at a position corresponding to the nozzle hole in the ejection direction, the pressing member pressing the nozzle plate from a downstream side in the ejection direction; Equipped with The diameter of the through hole is equal to or smaller than the thickness of the pressing member in the ejection direction, A liquid injection nozzle characterized in that the following formula (1) is satisfied, where Θ is an inclination angle of the injected liquid from the injection direction, L1 is a diameter of the nozzle hole, L2 is a diameter of the through hole, and T2 is a thickness of the pressing member. Θ<tan -1 (((L2-L1) / 2) / T2) (1)

2. The liquid injection nozzle according to claim 1, The nozzle plate is provided with a plurality of the nozzle holes.

3. The liquid injection nozzle according to claim 2, The liquid injection nozzle is characterized in that the through holes are provided one for each of the nozzle holes.

4. The liquid injection nozzle according to claim 2, The liquid ejection nozzle is characterized in that one through hole is provided corresponding to a plurality of the nozzle holes.

5. The liquid injection nozzle according to any one of claims 1 to 4, The liquid ejection nozzle according to claim 1, wherein the pressing member is configured to be detachable from the nozzle plate.

6. The liquid injection nozzle according to any one of claims 1 to 5, The liquid ejection nozzle is characterized in that the pressing member is made of a material containing resin.

7. The liquid injection nozzle according to any one of claims 1 to 6, The liquid ejection nozzle is characterized in that the through hole of the pressing member is treated to be liquid repellent with respect to the liquid.

8. The liquid injection nozzle according to any one of claims 1 to 7, a liquid supplying device for supplying the liquid to the liquid ejection nozzle; A liquid ejection apparatus comprising:

9. 9. The liquid ejection apparatus according to claim 8, The liquid ejection apparatus, wherein the liquid supply device uses gas pressure to send the liquid to the liquid ejection nozzle.

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