Liquid injection device

Abstract

This invention relates to a liquid jetting device, enabling efficient cleaning of skin, fibers, metals, etc. It comprises: a jetting nozzle (11) having at least one nozzle orifice (1) for jetting liquid; a pressurized liquid supply unit (27) for pressurizing the liquid to deliver it to the jetting nozzle; and a control unit (4) for controlling the operation of the pressurized liquid supply unit so that the liquid jetted from the nozzle orifice is ejected in a state of splitting from a continuous flow into droplets. The orifice diameter of the nozzle orifice (1) is 0.015 mm to 0.030 mm, and the liquid is a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s. The control unit controls the supply pressure of the pressurized liquid supply unit so that the velocity of the liquid jetted from the nozzle orifice (1) is 10 m / s to 80 m / s, and the number of droplets generated per second (droplets / s) from the continuous flow splitting into droplets is 0.8 × 10⁻⁶. 5 ~9.0×10 5 Within the range.

Description

Technical Field

[0001] This invention relates to a liquid spraying device suitable for spraying liquid toward objects such as the face, other skin, fibers, and metals for cleaning or other treatments. Background Technology

[0002] As an example of such a liquid spraying device, there is a skin cleanser described in Patent Document 1. This document discloses a skin cleanser that has a cup at the front end of the handheld part with the opening facing outward, and is used by pressing the spraying part against the skin, wherein the spraying part atomizes water supplied from the pump's outlet pressure and sprays it through the inside of the cup toward the opening.

[0003] Patent Document 1: Japanese Patent Application Publication No. 61-103443

[0004] However, the skin cleansing devices mentioned above suffer from a technical problem because they atomize the sprayed water to adhere to the skin, resulting in insufficient pressure to clean the skin, especially to effectively remove sebum and dirt from the sebaceous glands.

[0005] There is no record of treatments such as spraying liquids toward objects like fibers and metals for cleaning. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the liquid jetting device of the present invention is characterized by comprising: a jetting nozzle having at least one nozzle orifice for jetting liquid; a pressurized liquid supply unit for pressurizing the liquid to deliver the liquid to the jetting nozzle; and a control unit for controlling the operation of the pressurized liquid supply unit so that the liquid jetted from the nozzle orifice flies in a state of splitting from a continuous flow into droplets, wherein the orifice diameter is 0.015 mm to 0.030 mm, the liquid is a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s, and the control unit controls the supply pressure of the pressurized liquid supply unit so that the velocity of the liquid jetted from the nozzle orifice is 10 m / s to 80 m / s, and the number of droplets generated per second (droplets / s) as the number of droplets generated from the continuous flow splitting into droplets is 0.8 × 10⁻⁶. 5 ~9.0×10 5 Within the range.

[0007] Furthermore, to solve the aforementioned technical problems, the liquid jetting device of the present invention is characterized by comprising: a jetting nozzle having at least one nozzle orifice for jetting liquid; a pressurized liquid supply unit for pressurizing the liquid to deliver the liquid to the jetting nozzle; and a control unit for controlling the operation of the pressurized liquid supply unit so that the liquid jetted from the nozzle orifice flies in a state of splitting from a continuous flow into droplets, wherein the orifice diameter is 0.05 mm to 0.12 mm, the liquid is a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s, and the control unit controls the supply pressure of the pressurized liquid supply unit so that the velocity of the liquid jetted from the nozzle orifice is 10 m / s to 70 m / s, and the number of droplets generated per second (droplets / s) as the number of droplets generated from the continuous flow splitting into droplets is 0.3 × 10⁻⁶. 5 ~4.0×10 5 Within the range. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the liquid injection device according to Embodiment 1 of the present invention.

[0009] Figure 2 These are high-speed photographic images obtained by photographing the continuous flow and droplet movement when the liquid supply pressure is 0.4 MPa and 1.3 MPa in Embodiment 1.

[0010] Figure 3 (A) is a high-speed photographic image of the continuous flow at the nozzle orifice outlet, obtained by aligning the upper end face of the photographic viewpoint with the end face of the component housing the jet nozzle. Figure 3 Image (B) is a high-speed photographic image of a portion of the droplet transfer process in which continuous flow and droplets are mixed. Figure 3 (C) is a high-speed photographic image of a portion of a continuous flow that has completely split into droplets.

[0011] Figure 4 This is a high-speed photographic image used to illustrate the method for determining droplet velocity.

[0012] Figure 5 This is a high-speed photographic image used to illustrate the method for determining droplet frequency.

[0013] Figure 6 The graph shows the relationship between the measured droplet frequencies (measured droplet frequencies) obtained by measuring the droplet frequencies of liquids A to X and pure water at 20°C and 40°C under a nozzle with an orifice diameter of 0.015 mm, as shown in Table 1, and the calculated values ​​(calculated droplet frequencies) obtained by regression analysis of the measured values.

[0014] Figure 7The graph shows the relationship between the measured droplet frequencies (measured droplet frequencies) obtained by measuring the droplet frequencies of liquids A to Y and pure water at 20°C under a nozzle with an orifice diameter of 0.024 mm, as shown in Table 1, and the calculated values ​​(calculated droplet frequencies) obtained by regression analysis of the measured values.

[0015] Figure 8 The graph shows the relationship between the measured droplet frequencies (measured droplet frequencies) obtained by measuring the droplet frequencies of liquids A to E and pure water at 20°C under a nozzle with an orifice diameter of 0.03 mm, as shown in Table 1, and the calculated values ​​(calculated droplet frequencies) obtained by regression analysis of the measured values.

[0016] Figure 9 A graph is shown to illustrate the relationship between the measured droplet frequencies and the calculated droplet frequencies for liquids X and Y, and pure water at 20°C and 40°C, as recorded in Table 1 at various apertures.

[0017] Figure 10 The graph shows the relationship between the measured droplet frequency and the calculated / measured value for liquids A to X and pure water at 20°C and 40°C under a nozzle orifice with a diameter of 0.015 mm, as shown in Table 1.

[0018] Figure 11 The graph shows the relationship between the measured droplet frequency and the calculated / measured value for liquids A to Y and pure water at 20°C under a nozzle orifice with a diameter of 0.024 mm, as shown in Table 1.

[0019] Figure 12 The graph shows the relationship between the measured droplet frequency and the calculated / measured value for liquids A to E and pure water at 20°C under a nozzle orifice with a diameter of 0.03 mm, as shown in Table 1.

[0020] Figure 13 The graph shows the relationship between the measured droplet frequencies (measured droplet frequencies) obtained by measuring the droplet frequencies of liquids F to I and pure water at 20°C for a nozzle orifice with a diameter of 0.05 mm, as shown in Table 7, and the calculated values ​​(calculated droplet frequencies) obtained by regression analysis of the measured values.

[0021] Figure 14 The graph shows the relationship between the measured droplet frequencies (measured droplet frequencies) obtained by measuring the droplet frequencies of liquids F to I and pure water at 20°C for a nozzle orifice with an aperture of 0.08 mm, as shown in Table 7, and the calculated values ​​(calculated droplet frequencies) obtained by regression analysis of the measured values.

[0022] Figure 15The graph shows the relationship between the measured droplet frequencies (measured droplet frequencies) obtained by measuring the droplet frequencies of liquids F to I and pure water at 20°C for a nozzle orifice with a diameter of 0.12 mm, as shown in Table 7, and the calculated values ​​(calculated droplet frequencies) obtained by regression analysis of the measured values.

[0023] Figure 16 The graph shows the relationship between the measured droplet frequencies and the calculated droplet frequencies of pure water at 40°C and liquid Z at various apertures as recorded in Table 7.

[0024] Figure 17 The graph shows the relationship between the measured droplet frequency and the calculated / measured value for liquids F to I, pure water at 20°C and 40°C, and liquid Z in Table 7 for a nozzle orifice with an aperture of 0.05 mm.

[0025] Figure 18 The graph shows the relationship between the measured droplet frequency and the calculated / measured value for liquids F to I, pure water at 20°C, pure water at 40°C, and liquid Z in Table 7 for a nozzle orifice with an aperture of 0.08 mm.

[0026] Figure 19 The graph in Table 7 shows the relationship between the measured droplet frequency and the calculated / measured value for liquids F to I and pure water at 20°C and 40°C for a nozzle orifice with a diameter of 0.12 mm.

[0027] Explanation of reference numerals in the attached figures

[0028] 1: Nozzle orifice; 2: Spray section; 3: Liquid; 4: Control section; 5: Continuous flow; 6: Liquid tank; 7: Droplet; 9: Skin; 10: Flow path; 11: Spray nozzle; 12: Liquid suction tube; 14: Liquid delivery tube; 15: Center; 17: Central shaft; 25: Liquid spray device; 27: Pressurized liquid supply section; F: Liquid spray direction; b: Nozzle orifice diameter. Detailed Implementation

[0029] The present invention will first be briefly described below.

[0030] To solve the aforementioned technical problems, the first aspect of the liquid jetting device according to the present invention is a liquid jetting device, characterized in that it comprises: a jetting nozzle having at least one nozzle orifice for jetting liquid; a pressurized liquid supply unit for pressurizing the liquid to deliver the liquid to the jetting nozzle; and a control unit for controlling the operation of the pressurized liquid supply unit so that the liquid jetted from the nozzle orifice flies in a state of splitting from a continuous flow into droplets, the orifice diameter of the nozzle orifice being 0.015 mm to 0.030 mm, the liquid being a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s, the control unit controlling the supply pressure of the pressurized liquid supply unit so that the velocity of the liquid jetted from the nozzle orifice is 10 m / s to 80 m / s, and the number of droplets generated per second (droplets / s) as the number of droplets generated from the continuous flow splitting into droplets is 0.8 × 10⁻⁶. 5 ~9.0×10 5 Within the range.

[0031] It should be noted that the number of droplets generated per second from the splitting of the continuous flow into the droplets, i.e., the number of droplets (droplets / s), is sometimes referred to as the "droplet frequency".

[0032] The liquid jetting device of the present invention is a device that controls the supply pressure of the pressurized liquid supply unit through the control unit to jet liquid in a continuous flow from the nozzle orifice of the jetting nozzle, and then the continuous flow splits as it flies to generate droplets.

[0033] Regarding the size of the thus generated droplets, it is known, based on non-viscous linear theory, that it has a certain relationship with the orifice diameter b of the nozzle orifice. That is, regarding the size of the droplets, it is known, based on non-viscous linear theory, that it is independent of the magnitude of the supply pressure and is approximately 1.88 times the orifice diameter b of the nozzle orifice.

[0034] When the nozzle orifice diameter is set to 0.015mm to 0.030mm, the calculated value is 0.0282mm to 0.0564mm. If we further consider the slight variations due to the smoothness of the nozzle orifice, environmental conditions, etc., then the average droplet diameter is approximately 0.03mm to 0.1mm.

[0035] Next, regarding the jet velocity of the liquid ejected from the nozzle orifice, for a nozzle orifice with a determined diameter of 0.015 mm to 0.030 mm, it can be set by adjusting the supply pressure. Furthermore, if the jet velocity of the liquid is determined to be within the range of 10 m / s to 80 m / s, the velocity of the flying droplets is also determined. Since the droplet velocity is almost the same as the jet velocity, it is within the range of 10 m / s to 80 m / s.

[0036] Furthermore, the following relationship exists: if the liquid jet velocity increases, the flow rate (ml / min) of the liquid jetted from the nozzle orifice increases. Regarding the liquid jet velocity, it increases if the supply pressure increases and decreases if it decreases. Therefore, regarding the liquid flow rate (ml / min), the following relationship exists: since increasing the supply pressure increases the jet velocity, the liquid flow rate (ml / min) increases; since decreasing the supply pressure decreases the jet velocity, the liquid flow rate (ml / min) decreases. That is, regarding the "liquid flow rate (ml / min)," for a nozzle orifice with a defined diameter of 0.015 mm to 0.030 mm, it can be set by adjusting the supply pressure.

[0037] Furthermore, if the "liquid flow rate (ml / min)" is determined, then the number of droplets generated per second from the continuous flow splitting into droplets, i.e., the number of droplets (droplets / s), can be easily calculated by dividing the "droplet size" by the "liquid flow rate (ml / min)" as described above, since the "droplet size" is determined corresponding to the orifice diameter of 0.015mm to 0.030mm. In other words, if the "liquid flow rate (ml / min)" is determined, then the "droplet number (droplets / s)," i.e., the "droplet frequency," is also determined.

[0038] It should be noted that, regarding the "liquid flow rate (ml / min)," in the case of multiple rather than one spray nozzle orifice, it is a value obtained by multiplying by the number of orifices. This is also true in the following description.

[0039] Based on the above description, it can be understood that in the liquid injection device of the present invention, for injection nozzles with nozzle orifice diameters in the range of 0.015 mm to 0.030 mm, by adjusting the supply pressure of the pressurized liquid supply unit, the liquid injection velocity can be set to be in the range of 10 m / s to 80 m / s, and the droplet frequency to be in the range of 0.8 × 10⁻⁶ m / s. 5 ~9.0×10 5 Within the range.

[0040] That is, it is capable of discharging a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s at a velocity in the range of 10 m / s to 80 m / s and a droplet frequency of 0.8 × 10⁻⁶ m / s. 5 ~9.0×10 5 The flying droplets repeatedly adhere to objects such as skin within a certain range.

[0041] Based on this aspect, it can be understood from the above description that for a spray nozzle with an orifice diameter in the range of 0.015 mm to 0.030 mm, a liquid with a viscosity in the range of that range can be used to continuously apply the number of droplets (droplets / s) generated from the liquid to objects such as skin at that rate. This allows for effective cleaning of objects such as skin.

[0042] In addition, because the collision of droplets at the same frequency as ultrasound, i.e., the number of droplets per second, can physically stimulate the skin, it is expected to improve skin condition such as hydration and elasticity, i.e., skin care.

[0043] As will be described below, the inventors have confirmed that skin can be effectively cleansed by causing droplets generated from the liquid of the aforementioned viscosity and surface tension to fly at the aforementioned speed and number of droplets (droplets / s) and adhere to the skin.

[0044] The second aspect of the present invention relates to a liquid injection device characterized in that, in the first aspect, the liquid is a liquid with a viscosity of 0.65 mPa·s to 3.3 mPa·s, the velocity of the liquid injected from the nozzle orifice is in the range of 19 m / s to 63 m / s, and the number of droplets (droplets / s) is in the range of 1.3 × 10⁻⁶. 5 ~7.1×10 5 Within the range.

[0045] According to this aspect, the liquid is a liquid with a viscosity of 0.65 mPa·s to 3.3 mPa·s, the velocity of the liquid ejected from the nozzle orifice is in the range of 19 m / s to 63 m / s, and the number of droplets (droplets / s) is in the range of 1.3 × 10⁻⁶. 5 ~7.1×10 5 Within this range. Therefore, the first aspect of the effect can be achieved more effectively.

[0046] The third aspect of the present invention relates to a liquid jetting device characterized in that, in the first or second aspect, the dropletization distance of the continuous flow splitting into droplets is within 20 mm.

[0047] Here, "dropletization distance" refers to the distance from which the continuous flow of liquid ejected from one end face of the nozzle is split into droplets.

[0048] The droplet formation distance is related as follows: if the supply pressure increases, it becomes longer; if it decreases, it becomes shorter. By adjusting the supply pressure, the droplet formation distance can be kept within 20 mm.

[0049] According to this aspect, since the droplet distance is set to within 20mm, it is possible to obtain an effect that makes it easy for the droplet to adhere to the target position of an object such as skin.

[0050] A fourth aspect of the liquid jetting apparatus of the present invention is a liquid jetting apparatus characterized by comprising: a jetting nozzle having at least one nozzle orifice for jetting liquid; a pressurized liquid supply unit for pressurizing liquid to deliver the liquid to the jetting nozzle; and a control unit for controlling the operation of the pressurized liquid supply unit so that the liquid jetted from the nozzle orifice flies in a state of splitting from a continuous flow into droplets, the orifice having a diameter of 0.05 mm to 0.12 mm, the liquid being a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s, the control unit controlling the supply pressure of the pressurized liquid supply unit so that the velocity of the liquid jetted from the nozzle orifice is 10 m / s to 70 m / s, and the number of droplets generated per second (droplets / s) as the number of droplets generated from the continuous flow splitting into droplets is 0.3 × 10⁻⁶. 5 ~4.0×10 5 Within the range.

[0051] As can be understood from the above description regarding the first aspect, in the liquid injection device of the present invention, for injection nozzles with nozzle orifice diameters in the range of 0.05 mm to 0.12 mm, by adjusting the supply pressure of the pressurized liquid supply unit, the liquid injection velocity can be set to be in the range of 10 m / s to 70 m / s, and the droplet frequency to be in the range of 0.3 × 10⁻⁶ m / s. 5 ~4.0×10 5 Within the range.

[0052] That is, it is capable of discharging a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s at a velocity in the range of 10 m / s to 70 m / s and a droplet frequency of 0.3 × 10⁻⁶ m / s. 5 ~4.0×10 5 The flying droplets repeatedly adhere to objects such as skin, fibers, and metals within a certain range.

[0053] Based on this aspect, it can be understood from the above description that for a spray nozzle with an orifice diameter in the range of 0.05 mm to 0.12 mm, a liquid with a viscosity in the range of that range can be used to continuously adhere to objects such as skin, fibers, and metals by causing droplets generated from the liquid to fly at the specified rate. This enables effective cleaning and other treatments on the objects.

[0054] Furthermore, since the collision of droplets at a frequency equivalent to ultrasound (droplet count / s) can physically stimulate the skin, improvements in skin condition such as hydration and elasticity can be expected, i.e., skin care. For fibers and metals, the effect of softening or breaking down dirt and foreign matter adhering to the surface and interior of the substrate without damaging it can be expected to remove them.

[0055] As will be described below, the inventors have confirmed that by causing droplets generated from the liquid of the specified viscosity and surface tension to fly at the specified speed and number of droplets (droplets / s) and adhere to the object, the object can be effectively and appropriately cleaned or treated.

[0056] The fifth aspect of the present invention relates to a liquid injection device characterized in that, in the first aspect, the liquid is a liquid with a viscosity of 0.65 mPa·s to 3.3 mPa·s, the velocity of the liquid injected from the nozzle orifice is in the range of 14 m / s to 52 m / s, and the number of droplets (droplets / s) is in the range of 0.5 × 10⁻⁶. 5 ~2.4×10 5 Within the range.

[0057] According to this aspect, the liquid is a liquid with a viscosity of 0.65 mPa·s to 3.3 mPa·s, the velocity of the liquid ejected from the nozzle orifice is in the range of 14 m / s to 52 m / s, and the number of droplets (droplets / s) is in the range of 0.5 × 10⁻⁶. 5 ~2.4×10 5 Within this range. Therefore, the first aspect of the effect can be achieved more effectively.

[0058] The liquid jetting device according to the sixth aspect of the present invention is characterized in that, in the fourth or fifth aspect, the dropletization distance of the continuous flow splitting into droplets is 5 mm to 150 mm.

[0059] Here, "dropletization distance" refers to the distance from which the continuous flow of liquid ejected from one end face of the nozzle is split into droplets.

[0060] The droplet formation distance is related as follows: increasing the supply pressure increases it, while decreasing it decreases it. The droplet formation distance can be adjusted from 5mm to 150mm by adjusting the supply pressure.

[0061] According to this aspect, since the droplet distance is set to 5mm to 150mm, it can be used either by bringing the nozzle orifice of the jet nozzle close to the object, or by maintaining a sufficient distance from the object instead of bringing the nozzle orifice close to it. Therefore, by controlling the droplet velocity corresponding to the characteristics of the object, a suitable impact pressure can be applied to the object.

[0062] Furthermore, by adhering the droplets to fibers, metals, and resins, dirt adhering to the surface and interior of the object can be cleaned without damaging the substrate. Additionally, it allows for easy adhesion of the droplets to the target location on the object.

[0063] Implementation Method 1

[0064] The following is based on Figure 1 The liquid injection device according to Embodiment 1 of the present invention will be described in detail.

[0065] The liquid spraying device 25 of this embodiment is a liquid spraying device that uses a skin cleansing liquid suitable for cleaning the skin of the face, wrists, hands, feet, back, etc., and a hair liquid for the scalp and hair.

[0066] It should be noted that, of course, the liquid spray device 25 is not limited to devices for skin cleansing.

[0067] like Figure 1 As shown, the liquid jetting device 25 according to this embodiment includes: a jetting nozzle 11 having at least one nozzle hole 1 for jetting liquid 3; a pressurized liquid supply unit 27 for pressurizing the liquid 3 to deliver the liquid 3 to the jetting nozzle 11; and a control unit 4 for controlling the operation of the pressurized liquid supply unit 27 so that the liquid 3 jetted from the nozzle hole 1 flies in a state of splitting from the continuous flow 5 into droplets 7.

[0068] Furthermore, in the liquid injection device 25 according to this embodiment, the orifice diameter b of the nozzle orifice 1 is 0.015 mm to 0.030 mm, and the injected liquid 3 is a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s.

[0069] Furthermore, the control unit 4 is configured to control the supply pressure of the pressurized liquid supply unit 27, so that the jet velocity of the liquid 3 ejected from the jet nozzle 11 is in the range of 10 m / s to 80 m / s, and the number of droplets 7 generated per second by splitting from the continuous flow 5 into droplets 7, i.e., the number of droplets (droplets / s), is within 0.8 × 10⁻⁶. 5 ~9.0×10 5 Within the range.

[0070] Specifically, the liquid injection device 25 includes: an injection section 2 with an injection nozzle 11 for injecting liquid 3; a liquid tank 6 for storing the injected liquid 3; a pump unit serving as a pressurized liquid supply section 27; a liquid suction pipe 12 forming a flow path 10 connecting the liquid tank 6 and the pressurized liquid supply section 27 for the liquid 3; and a liquid delivery pipe 14, similarly forming a flow path 10 connecting the pressurized liquid supply section 27 and the injection section 2. In this embodiment, the liquid suction pipe 12 and the liquid delivery pipe 14 are made of a soft resin material, but are not limited to this material.

[0071] The pressurized liquid supply unit 27 controls the pump operation, such as the pressure of the liquid 3 delivered to the injection unit 2 through the liquid delivery pipe 14, via the control unit 4. That is, it controls the supply pressure.

[0072] Properties of the sprayed liquid

[0073] As described above, in the liquid injection device 25 of this embodiment, the injected liquid 3 is a liquid with a viscosity in the range of 0.6 mPa·s to 4.0 mPa·s.

[0074] The viscosity range of the liquid 3 is set under the assumption that the ambient temperature of the liquid injection device 25 is in the range of 5°C to 45°C.

[0075] For example, the viscosity of water (mPa·s) is 1.519 at 5°C, 1.307 at 10°C, 1.138 at 15°C, 1.002 at 20°C, 0.890 at 25°C, 0.798 at 30°C, and 0.720 at 35°C.

[0076] By setting the viscosity of the liquid 3 used to a range of 0.6 mPa·s to 4.0 mPa·s, when cleaning the object with the droplets, the desired number of droplets can be ensured whether an aqueous liquid is used or a liquid with a higher viscosity than the aqueous liquid (e.g., a liquid containing hydrocarbon components or synthetic compounds) is used, and the effect of improving cleaning efficiency through appropriate and sufficient impact can be expected.

[0077] jet nozzle

[0078] Regarding the injection nozzle 11, in this embodiment, for ease of understanding, an injection nozzle having a nozzle orifice 1 and injecting liquid 3 directly from the nozzle orifice 1 will be described. Figure 1 In the enlarged view, reference numeral F indicates the direction of liquid injection. Nozzle orifice 1 is configured as a cylindrical shape with a circular outlet in the direction of liquid injection F.

[0079] The liquid 3 ejected from nozzle orifice 1 initially flows continuously 5, but immediately breaks into droplets 7 due to the surface tension of the liquid 3. These droplets 7 are arranged in a straight line and fly in the liquid ejection direction F. The object is cleaned by continuously contacting these flying droplets 7 with an object 9 such as skin.

[0080] It should be noted that, for Figure 1 The enlarged view in the figure shows that, in order to make the figure easier to understand, the size of the droplet 7 and the continuous flow 5 has been greatly enlarged relative to other components, and the relative size relationship has been ignored.

[0081] The diameter of the nozzle orifice and the size of the droplet

[0082] The liquid jetting device 25 of this embodiment jets liquid 3 from the nozzle hole 1 of the jetting nozzle 11 as a continuous flow 5 at a predetermined supply pressure. The continuous flow 5 then splits as it flies to generate droplets 7.

[0083] Regarding the size of the thus generated droplet 7 (hereinafter also referred to as the "droplet diameter"), although this is a partially repetitive explanation, it is known, based on non-viscous linear theory, that it has a certain relationship with the orifice diameter b of the nozzle orifice 1. That is, based on non-viscous linear theory, it is known that the droplet 7, independent of the magnitude of the supply pressure, is approximately 1.88 times the orifice diameter b of the nozzle orifice 1. In other words, as long as the orifice diameter b of the nozzle orifice 1 is specifically determined, the size of the generated droplet 7 will be determined.

[0084] When the orifice diameter b of nozzle orifice 1 is set to 0.015mm to 0.030mm, the calculated value is 0.0282mm to 0.0564mm. Further considering the slight variations due to the smoothness of nozzle orifice 1 and environmental conditions, the average droplet diameter is approximately 0.03mm to 0.1mm.

[0085] Since most of the multiple droplets 7 are not actually perfectly spherical but deformed into elliptical shapes, the "average droplet diameter" is calculated as the average of the longest and shortest diameter portions.

[0086] Supply pressure and injection speed

[0087] The following relationship exists: if the supply pressure of the pressurized liquid supply unit is increased, the injection speed of the liquid 3 ejected from the nozzle orifice 1 increases; if the supply pressure is decreased, the injection speed of the liquid 3 ejected from the nozzle orifice 1 decreases.

[0088] If the orifice diameter b of the nozzle orifice 1 is determined, the injection velocity of the liquid 3 ejected from the nozzle orifice 1 can be set within the range of 10 m / s to 80 m / s by adjusting the supply pressure in conjunction with the orifice diameter b.

[0089] If the jet velocity of liquid 3 is determined, then the velocity of the flying droplet 7 will also be determined. Since the velocity of droplet 7 is almost the same as the jet velocity, it is between 10 m / s and 80 m / s.

[0090] Supply pressure, injection velocity, liquid flow rate, and droplet number

[0091] Increasing the supply pressure increases the jet velocity of the liquid 3 ejected from nozzle orifice 1, thus increasing the flow rate (ml / min) of the liquid ejected from nozzle orifice 1. Conversely, decreasing the supply pressure decreases the jet velocity of the liquid 3 ejected from nozzle orifice 1, thus decreasing the flow rate (ml / min) of the liquid ejected from nozzle orifice 1. This relationship exists between the supply pressure and the flow rate (ml / min) of the liquid.

[0092] Therefore, if the orifice diameter b of nozzle orifice 1 is determined, the flow rate (ml / min) of the liquid ejected from nozzle orifice 1 can be set to a determined flow rate by adjusting the supply pressure in conjunction with the orifice diameter b.

[0093] Furthermore, if the "liquid flow rate (ml / min)" is determined, then the number of droplets 7 generated per unit time (droplets / s) by splitting from the continuous flow 5 into droplets 7 can be easily calculated by dividing the "droplet size" by the "liquid flow rate (ml / min)" as described above, since the "droplet size" is approximately in the range of 0.03 mm to 0.1 mm. That is, if the "liquid flow rate (ml / min)" is determined, then the "droplet frequency" will also be determined.

[0094] It should be noted that the liquid flow rate (ml / min) is the value obtained by multiplying by the number of nozzle orifices 1 if there is not one orifice 1. This is also true in the following explanation.

[0095] Based on the above explanation, it can be understood that in this liquid injection device 25, for a nozzle orifice diameter b within the range of 0.015 mm to 0.030 mm, by adjusting the supply pressure of the pressurized liquid supply unit 27, the injection speed of the liquid 3 can be set to be within the range of 10 m / s to 80 m / s, and the droplet frequency to be within 0.8 × 10⁻⁶ m / s. 5 ~9.0×10 5 Within the range.

[0096] That is, it is capable of discharging a liquid with a viscosity of 0.6 mPa·s to 4.0 mPa·s at a velocity in the range of 10 m / s to 80 m / s and a droplet frequency of 0.8 × 10⁻⁶ m / s. 5 ~9.0×105 7. Flying droplets within a certain range repeatedly adhere to objects such as skin. 9.

[0097] Specifically, when the orifice diameter b of nozzle orifice 1 is set to, for example, 0.024 mm, based on the non-viscous linear theory, the size of the generated droplet 7 is approximately 1.88 times the orifice diameter b of nozzle orifice 1, becoming 0.045 mm. That is, the droplet diameter of droplet 7 is approximately 0.05 mm.

[0098] Furthermore, when the supply pressure is adjusted to make the jet velocity of liquid 3, i.e. the velocity of the flying droplets 7, 10 m / s, the flow rate (ml / min) of liquid supplied to each orifice of nozzle 1 is approximately 0.3, and the number of droplets generated per second (droplets / s) is approximately 1.0 × 10⁻⁶. 5 .

[0099] When the supply pressure is adjusted so that the jet velocity of liquid 3, i.e. the velocity of the flying droplets 7, is 19 m / s, the flow rate (ml / min) of the liquid supplied to each orifice of nozzle 1 is approximately 0.51, and the number of droplets generated per second (droplets / s) is approximately 1.8 × 10⁻⁶. 5 .

[0100] When the supply pressure is adjusted to make the jet velocity of liquid 3, i.e. the velocity of the flying droplets 7, 63 m / s, the flow rate (ml / min) of the liquid supplied to each orifice of nozzle 1 is approximately 1.7, and the number of droplets generated per second (droplets / s) is approximately 5.9 × 10⁻⁶. 5 .

[0101] When the supply pressure is adjusted to make the jet velocity of liquid 3, i.e. the velocity of the flying droplets 7, 80 m / s, the flow rate (ml / min) of the liquid supplied to each orifice of nozzle 1 is approximately 2.2, and the number of droplets generated per second (droplets / s) is approximately 7.6 × 10⁻⁶. 5 .

[0102] Furthermore, in the liquid injection device 25 according to this embodiment, the pressurized liquid supply unit 27 is configured to supply liquid 3 at a supply pressure of 0.3MPa to 3.2MPa for the liquid 3 injected from the nozzle orifice 1.

[0103] The control unit 4 controls the supply pressure of the pressurized liquid supply unit 27 to ensure that the jet velocity V of the liquid 3 ejected from the nozzle orifice 1 is 10 m / s to 80 m / s. When the supply pressure is in the range of 0.3 MPa to 3.2 MPa, it is easy to achieve a jet velocity V of 10 m / s to 80 m / s for the liquid 3. It should be noted that since it is sufficient for the jet velocity V of the liquid 3 to be 10 m / s to 80 m / s, the supply pressure is not limited to the range of 0.3 MPa to 3.2 MPa.

[0104] The supply pressure is correlated with the injection velocity V. When the supply pressure is 2.4 MPa, the injection velocity V is almost 60 m / s, and when the supply pressure is 3.2 MPa, the injection velocity V is almost 80 m / s.

[0105] In this embodiment, since it is a liquid jetting device 25 for skin cleansing, the supply pressure is set in conjunction with the orifice diameter b of the nozzle orifice 1 so that the droplet distance is within 20 mm. "Droplet distance" refers to the distance from which the continuous flow 5, which is sprayed as a continuous flow 5 from the end face 13 of the jetting nozzle 11, splits into droplets 7.

[0106] It should be noted that, alternatively, a structure for excitating the continuous jet flow 5 can be pre-configured within the jet nozzle 11, which, in addition to controlling the supply pressure, allows adjustment of the droplet distance through the excitation.

[0107] In this embodiment, liquid 3 is a facial cleanser containing glycerin, a hair liquid (e.g., hair conditioner and hair product), but it may also be a cosmetic lotion, water containing anti-inflammatory ingredients, or a formulated water containing antibacterial ingredients.

[0108] It should be noted that the liquid 3 may also contain vitamin B2 and B6 to inhibit skin inflammation, ibuprofen pyridine methanol and dipotassium glycyrrhizate as anti-inflammatory components, and resorcinol, isopropyl methylphenol and ethanol as bactericidal components.

[0109] Detailed explanation

[0110] Figure 2 The images are high-speed photographic images obtained by taking pictures of the jetting state, i.e. the flight trajectory of the droplet 7, when the nozzle orifice diameter b of 1 is 0.024 mm and the liquid supply pressure of 3 is 0.4 MPa (top image) and 1.3 MPa (bottom image) using a high-speed camera.

[0111] Even when the supply pressure of liquid 3 is 1.3 MPa, the droplet distance is undoubtedly within 20 mm, and it is known to be within 15 mm.

[0112] Parsing value

[0113] Figure 3 In order to be based on and Figure 2 Similarly, high-speed photography of droplet images obtained from representative jetting states of liquids is used to evaluate jetting and droplet characteristics, and image processing is performed to obtain analytical images through binarization.

[0114] The free software ImageJ was used in the image processing. In the image processing, the photographic image was binarized, and the dropletized area was selected as the analytical region. The region number of each droplet 7 within the analytical region and the coordinates of the center 15 of each droplet 7 were calculated.

[0115] Dropletization distance

[0116] exist Figure 3 In the image, (A) is a high-speed photographic image of the continuous flow 5 at the outlet of the nozzle orifice 1, obtained by aligning the upper end face of the photographic viewpoint with the end face of the component housing the jet nozzle 11; (B) is a high-speed photographic image of a portion of the continuous flow 5 and droplets 7 in a dropletization transfer process; and (C) is a high-speed photographic image of a portion of the continuous flow 5 completely split into droplets 7.

[0117] The dropletization distance is calculated based on the distance the continuous flow 5 moves from state (A) to state (C).

[0118] When the orifice diameter b of nozzle orifice 1 is 0.024 mm, the droplet 7 has good directness, and the droplet distance can be set to within 20 mm by adjusting the supply pressure.

[0119] Furthermore, the maximum axial offset of the droplet center 15 of the flying droplet 7 relative to the central axis 17 of the jet nozzle 1 is 0.2 mm. Therefore, the droplet 7 can be irradiated to the target position.

[0120] droplet speed

[0121] like Figure 4 As shown, two images are selected from the images obtained by photographing the continuous flow 5 completely split into droplets 7 in flight using a high-speed camera. The velocity of the droplet is calculated by dividing the time interval between the two images by the distance d that the droplet 7 of interest has traveled.

[0122] It should be noted that the moving distance d is calculated based on the length of each pixel, which is determined by the viewing angle of the photographed image, and the shooting time interval is calculated based on the shooting speed (frame rate).

[0123] When the orifice diameter b of nozzle orifice 1 is 0.024 mm, the droplet velocity can be kept below approximately 60 m / s while maintaining the supply pressure below 2.4 MPa. This ensures that the impact pressure of the droplet 7 is not too strong, allowing for safe application to areas such as skin and scalp.

[0124] Droplet frequency (number of droplets / s)

[0125] like Figure 5As shown, to find the average number of droplets within the field of view of a photographic image, divide the number of droplets by the size (length) of the field of view to obtain the average distance between the droplets. Divide the average distance between the droplets by the droplet velocity to obtain the droplet frequency (number of droplets per second). Regarding the average number, for example in... Figure 5 In the middle, there are seven droplets formed by the nozzle orifice 1 corresponding to the droplet 7 in the rectangular frame 18. Most of the other nozzle orifices 1 are the same, also seven.

[0126] It should be noted that the average distance is calculated based on the length of each pixel, which is determined according to the viewing angle of the photographic image.

[0127] The droplet frequency increases with the droplet velocity. Therefore, by changing the droplet velocity, a greater impact force can be achieved, leading to more efficient cleaning.

[0128] As described above, for dirt, such as dirt accumulated on the skin, scalp, and especially the roots of hair, and lipids, at the irradiation location of the target object 9, droplets 7 are brought into contact with the target object 9 at the aforementioned droplet speed and frequency (droplet count (droplets / s)). This impact emulsifies and softens the dirt, making it easier to remove. If shampoos, lotions, hair conditioners, etc., are used as liquid 3, then the droplets 7 of these liquids 3 can be efficiently delivered to the stratum corneum, pores / hair roots, etc., providing skin care or scalp care benefits. This helps maintain good skin elasticity and hydration.

[0129] Table 1 shows the physical properties of various liquids being evaluated and their viscosities. Table 2 shows the measured values ​​of droplet frequency and droplet velocity for liquids A to E recorded in Table 1, evaluated using a jet nozzle 11 with nozzle orifice diameter b (hereinafter also referred to as "nozzle diameter b") of 0.015 mm, 0.024 mm, and 0.03 mm. Table 3 shows the measured values ​​of supply pressure (hereinafter sometimes referred to as "jet pressure") and droplet distance for liquids A to E also recorded in Table 1, using a jet nozzle 11 with nozzle diameter b of 0.015 mm, 0.024 mm, and 0.03 mm.

[0130] Table 2 corresponds to Table 3. That is, the droplet frequency and droplet velocity in Table 2 are the measured values ​​of each supply pressure in Table 3.

[0131] It should be noted that the viscosity was measured using a viscoelasticity meter AR-G2 (TA Instruments, manufactured in Japan, temperature 20°C).

[0132] Table 1

[0133] Evaluation liquid Viscosity [mPa·s] A 3.27 B 2.50 C 0.97 D 1.20 E 1.47 X 3.18 Y 2.67 Pure water at 20℃ 1.00 Pure water at 40℃ 0.65

[0134] Table 2

[0135]

[0136] Table 3

[0137]

[0138] Regression analysis was performed on the measured droplet frequency and droplet velocity values ​​for liquids A to E in Table 2. The droplet frequency drop was calculated using nozzle diameter b (mm), droplet velocity V (m / s), and viscosity η (mPa·s) as parameters. freq The relation (1) is (number / s).

[0139] Drop freq =2.0×10 5 -9.2×10 6 b+1.0×10 4 V-1.5×10 4 η (1)

[0140] Figure 6 A graph showing the relationship between the measured droplet frequencies (horizontal axis) of liquids A to X and pure water at 20°C and 40°C, obtained from the regression analysis performed on a jet nozzle 11 with a nozzle diameter b of 0.015 mm, and the calculated droplet frequencies (vertical axis) obtained by equation (1). The two show a very good linear correlation.

[0141] Figure 7 A graph showing the relationship between the measured droplet frequencies (horizontal axis) of liquids A to Y and pure water at 20°C obtained from the regression analysis performed on a jet nozzle 11 with a nozzle diameter b of 0.024 mm and the calculated droplet frequencies (vertical axis) obtained by equation (1). The two show a very good linear correlation.

[0142] Figure 8 A graph showing the relationship between the measured droplet frequencies (horizontal axis) of liquids A to E and pure water at 20°C obtained from the regression analysis performed on a jet nozzle 11 with a nozzle diameter b of 0.03 mm and the calculated droplet frequencies (vertical axis) obtained by equation (1). The two show a very good linear correlation.

[0143] Next, for other liquids with known physical properties that were not subjected to the regression analysis, namely liquid X, liquid Y, pure water at 20°C, and pure water at 40°C, the droplet frequency is calculated using equation (1).

[0144] Figure 9This graph illustrates the relationship between the measured droplet frequencies (horizontal axis) and the calculated droplet frequencies (vertical axis) for liquid X, liquid Y, pure water at 20°C, and pure water at 40°C under each nozzle diameter b, as shown in the figure. Figure 9 The dashed line in the diagram represents two values ​​that are exactly the same. Figure 9 It can be seen that the calculated droplet frequency is the same as or slightly lower than the measured droplet frequency, confirming a good linear correlation.

[0145] Table 4 shows the measured values, calculated values, and the ratio of the two values ​​(calculated value / measured value) of droplet frequencies for liquids A to X and pure water at 20°C and 40°C under a spray nozzle 11 with a nozzle diameter b of 0.015 mm.

[0146] Figure 10 The relationship between the measured droplet frequencies (horizontal axis) and the calculated / measured values ​​(vertical axis) of liquids A to X and pure water at 20°C and 40°C under a spray nozzle 11 with a nozzle diameter b of 0.015 mm is shown.

[0147] Table 4

[0148]

[0149] Table 5 shows the measured values, calculated values, and the ratio of the two values ​​(calculated value / measured value) of droplet frequencies for liquids A to Y and pure water at 20°C under a spray nozzle 11 with a nozzle diameter b of 0.024 mm.

[0150] Figure 11 The relationship between the measured droplet frequencies (horizontal axis) and the calculated / measured values ​​(vertical axis) of liquids A to Y and pure water at 20°C under a jet nozzle 11 with a nozzle diameter b of 0.024 mm is shown.

[0151] Table 5

[0152]

[0153] Table 6 shows the measured values, calculated values, and the ratio of the two values ​​(calculated value / measured value) of the droplet frequencies of liquids A to E and pure water at 20°C under a spray nozzle 11 with a nozzle diameter b of 0.03 mm.

[0154] Figure 12 The relationship between the measured droplet frequencies (horizontal axis) and the calculated / measured values ​​(vertical axis) of liquids A to E and pure water at 20°C under a jet nozzle 11 with a nozzle diameter b of 0.03 mm is shown.

[0155] Table 6

[0156]

[0157] When the measured droplet frequency is 1.3 × 10⁻⁶ 5 ~7.1×10 5 When the droplet frequency is within the range of droplets / s, the droplet frequency of any evaluation liquid calculated according to the relationship (1) is consistent within ±30% error (Note: more than 90% of all data have an error within ±20%), indicating that the relationship derived by regression analysis is reasonable.

[0158] Based on the above, this liquid injection device 25 can transform a liquid 3 with a viscosity in the range of 0.6 mPa·s to 4.0 mPa·s from a continuous flow into droplets when the orifice diameter b of the injection nozzle 11 is 0.015 mm to 0.03 mm, and the droplet velocity is in the range of 10 m / s to 80 m / s with a droplet frequency of 0.8 × 10⁻⁶ m / s. 5 ~9.0×10 5 It is periodically sprayed out within a certain range.

[0159] Explanation of the effects of Implementation Method 1

[0160] (1) According to this embodiment, as can be understood from the above description, for a spray nozzle with an orifice diameter b of the nozzle orifice 1 in the range of 0.015 mm to 0.030 mm, a liquid 3 with a viscosity in the range of that range can be used to continuously adhere to the object 9 such as skin by sending the number of droplets 7 generated from the liquid 3 (droplets / s) flying at the specified rate. Thus, the object 9 such as skin can be effectively cleaned.

[0161] In addition, because the collision of droplets 7 at a frequency equivalent to ultrasound, i.e., the number of droplets (droplets / s), can physically stimulate the skin, it is expected to improve skin condition such as hydration and elasticity, i.e., skin care.

[0162] (2) In addition, according to this embodiment, since the droplet distance is set to within 20 mm, it is possible to obtain the effect that the droplet 7 can easily adhere to the target position of the object 9 such as skin.

[0163] Implementation Method 2

[0164] The liquid injection device according to Embodiment 2 of the present invention will be described in detail below.

[0165] The liquid spraying device 25 of this embodiment is a liquid spraying device that can effectively clean and treat materials such as fibers, metals and resins, and is not limited to cleaning skin.

[0166] The basic structure of the liquid injection device 25 involved in this embodiment is mostly the same as that of the liquid injection device in Embodiment 1, except that the orifice diameter b of the nozzle orifice 1 is different. Therefore, in the following description, the description of the parts common to Embodiment 1 will be omitted.

[0167] Table 7 shows the physical properties of various liquids and their viscosities for evaluation. Table 8 shows the measured droplet frequency and droplet velocity of liquids F to I and pure water at 20°C recorded in Table 7, obtained by using a jet nozzle 11 with nozzle orifice diameter b (hereinafter also referred to as "nozzle diameter b") of 0.05 mm, 0.08 mm, and 0.12 mm. Table 9 shows the measured supply pressure (hereinafter sometimes referred to as "jet pressure") and droplet distance of liquids F to I and pure water at 20°C, also recorded in Table 7, using a jet nozzle 11 with nozzle diameter b of 0.05 mm, 0.08 mm, and 0.12 mm.

[0168] Table 8 corresponds to Table 9. That is, the droplet frequency and droplet velocity in Table 8 are the measured values ​​of each supply pressure in Table 9.

[0169] It should be noted that the viscosity was measured using a viscoelasticity meter AR-G2 (TA Instruments, manufactured in Japan, temperature 20°C).

[0170] Table 7

[0171] Evaluation liquid Viscosity [mPa·s] F 2.50 G 0.97 H 1.47 | 1.20 Pure water at 20℃ 1.00 Pure water at 40℃ 0.65 Z 3.27

[0172] Table 8

[0173]

[0174] Table 9

[0175]

[0176] Regression analysis was performed on the measured droplet frequency and droplet velocity values ​​for liquids F to I and pure water at 20°C in Table 8. The nozzle diameter b (mm), droplet velocity V (m / s), and viscosity η (mPa·s) were used as parameters to calculate the droplet frequency drop. freq The relation (2) is (number / s).

[0177] Drop freq =9.0×10 4 -1.1×10 6 b+3.6×10 3 V-1.3×10 4 η (2)

[0178] Figure 13A graph showing the relationship between the measured droplet frequencies (horizontal axis) of liquids F to I and pure water at 20°C obtained from the regression analysis performed on a jet nozzle 11 with a nozzle diameter b of 0.05 mm and the calculated droplet frequencies (vertical axis) obtained by equation (2). The two show a very good linear correlation.

[0179] Figure 14 A graph showing the relationship between the measured droplet frequencies (horizontal axis) of liquids F to I and pure water at 20°C obtained from the regression analysis performed on a jet nozzle 11 with a nozzle diameter b of 0.08 mm and the calculated droplet frequencies (vertical axis) obtained by equation (2). The two show a very good linear correlation.

[0180] Figure 15 A graph showing the relationship between the measured droplet frequencies (horizontal axis) of liquids F to I and pure water at 20°C obtained from the regression analysis performed on a jet nozzle 11 with a nozzle diameter b of 0.12 mm and the calculated droplet frequencies (vertical axis) obtained by equation (2). The two show a very good linear correlation.

[0181] Next, for other liquids with known physical properties that were not subjected to the regression analysis, namely pure water at 40°C and liquid Z, the droplet frequency is calculated using equation (2).

[0182] Figure 16 This graph illustrates the relationship between the measured droplet frequencies (horizontal axis) and the calculated droplet frequencies (vertical axis) of pure water at 40°C and liquid Z at various nozzle diameters b, as recorded in the figure. Figure 16 The dashed line in the diagram represents two values ​​that are exactly the same. Figure 16 It can be seen that the calculated droplet frequency is the same as or slightly lower than the measured droplet frequency, confirming a good linear correlation.

[0183] Table 10 shows the measured values, calculated values, and the ratio of the two values ​​(calculated value / measured value) for liquids F to I, pure water at 20°C, pure water at 40°C, and liquid Z under a spray nozzle 11 with a nozzle diameter b of 0.05 mm.

[0184] Figure 17 The relationship between the measured droplet frequencies (horizontal axis) and the calculated / measured values ​​(vertical axis) of liquids F to I, pure water at 20°C, pure water at 40°C, and liquid Z under a spray nozzle 11 with a nozzle diameter b of 0.05 mm is shown.

[0185] Table 10

[0186]

[0187] Table 11 shows the measured values, calculated values, and the ratio of the two values ​​(calculated value / measured value) of droplet frequencies for liquids F to I, pure water at 20°C, pure water at 40°C, and liquid Z under a spray nozzle 11 with a nozzle diameter b of 0.08 mm.

[0188] Figure 18 The relationship between the measured droplet frequency (horizontal axis) and the calculated / measured value (vertical axis) of liquids F to I, pure water at 20°C, pure water at 40°C, and liquid Z under a spray nozzle 11 with a nozzle diameter b of 0.08 mm is shown.

[0189] Table 11

[0190]

[0191] Table 12 shows the measured values, calculated values, and the ratio of the two values ​​(calculated value / measured value) of the droplet frequencies of liquids F to I, pure water at 20°C, and pure water at 40°C under a spray nozzle 11 with a nozzle diameter b of 0.12 mm.

[0192] Figure 19 The relationship between the measured droplet frequencies (horizontal axis) and the calculated / measured values ​​(vertical axis) of liquids F to I, pure water at 20°C and 40°C under a jet nozzle 11 with a nozzle diameter b of 0.12 mm is shown.

[0193] Table 12

[0194]

[0195] When the measured droplet frequency is 0.5 × 10 5 ~2.4×10 5 When the droplet frequency is within the range of droplets / s, the droplet frequency calculated by any evaluation liquid according to the relationship (2) is consistent within ±30% error (Note: more than 95% of all data are within ±20% error), indicating that the relationship derived by regression analysis is reasonable.

[0196] Based on the above, when the orifice diameter b of the injection nozzle 11 is 0.05 mm to 0.12 mm, this liquid injection device 25 can transform a liquid 3 with a viscosity in the range of 0.6 mPa·s to 4.0 mPa·s from a continuous flow into droplets, with a droplet velocity in the range of 10 m / s to 70 m / s and a droplet frequency of 0.3 × 10⁻⁶ m / s. 5 ~4.0×10 5 It is periodically sprayed out within a certain range.

[0197] Explanation of the effects of Implementation Method 2

[0198] (1) According to this embodiment, as can be understood from the above description, for a spray nozzle with an orifice diameter of 0.05 mm to 0.12 mm, a liquid 3 with a viscosity within the aforementioned range can be used to continuously adhere to an object 9 such as skin, fiber, or metal, by causing droplets 7 generated from the liquid 3 to fly at the aforementioned rate. This allows for effective cleaning or other treatment of the object 9.

[0199] (2) Furthermore, according to this embodiment, since the droplet distance is set to 5mm to 150mm, it can be used either by bringing the nozzle orifice 1 of the spray nozzle 11 close to the object 9, or by keeping a sufficient distance between the nozzle orifice 1 and the object 9. Thus, by controlling the droplet velocity corresponding to the characteristics of the object 9, an appropriate impact pressure can be applied to the object 9.

[0200] Furthermore, by attaching the droplet 7 of this embodiment to fibers, metals, resins, etc., dirt adhering to the surface and interior of the object 9 can be cleaned without damaging the substrate of the object 9. Additionally, it is possible to easily attach the droplet 7 to the target location of the object 9.

[0201] Other implementation methods

[0202] The liquid injection device 25 according to the embodiments of the present invention basically has the configuration described above, but of course, some configuration changes or omissions can be made without departing from the spirit of the present invention.

[0203] In the description of the above embodiment, it was explained that the spray nozzle 11 has one nozzle orifice 1. If it is configured to have multiple nozzle orifices 1, the cleaning area can be easily expanded. In this case, it is preferable to determine the number of nozzle orifices 1 based on the orifice diameter b of the nozzle orifice 1, the appropriate flow rate in use, and the desired supply pressure.

[0204] Furthermore, by setting nozzle holes 1 with different orifice diameters, it is possible to spray droplets 7 with different droplet diameters at the same droplet velocity. Although the droplet diameter does not affect the impact pressure, the kinetic energy increases with the number of droplets, thus increasing the force applied to the impacted part. As a result, the massage effect can be improved while maintaining a constant cleaning force.

Claims

1. A liquid ejecting apparatus characterized by comprising: Possessing: an ejection nozzle having at least one nozzle hole that ejects a liquid; a pressurized liquid supply that pressurizes a liquid to send the liquid to the ejection nozzle; and a control section that controls the operation of the pressurized liquid supply to cause the liquid ejected from the nozzle hole to fly in a state in which a continuous flow is split into droplets, the nozzle hole has a hole diameter of 0.015 mm to 0.030 mm, the liquid is a liquid having a viscosity of 0.6 mPa・s to 4.0 mPa・s, 2. The liquid ejection apparatus according to claim 1, wherein The control section controls the supply pressure of the pressurized liquid supply section so that the speed of the liquid jetted from the nozzle hole is 10 m / s to 80 m / s, and so that the number of droplets per second (pieces / s) as the number of droplets generated by the splitting of the continuous flow into the droplets is Drop freq , 。 the liquid is a liquid having a viscosity of 0.65 mPa・s to 3.3 mPa・s, a velocity of the liquid ejected from the nozzle hole is in a range of 19 m / s to 63 m / s, 3. The liquid ejection apparatus according to claim 1 or 2, wherein The number of droplets (pieces / s) is in the range of 1.3 x 10 5 ~ 7.1 x 10 5 ~ 7.1 x 10 a dropletization distance at which the continuous flow is split into droplets is within 20 mm. Possessing:

4. A liquid ejecting apparatus characterized by comprising: an ejection nozzle having at least one nozzle hole that ejects a liquid; a pressurized liquid supply that pressurizes a liquid to send the liquid to the ejection nozzle; and a control section that controls the operation of the pressurized liquid supply to cause the liquid ejected from the nozzle hole to fly in a state in which a continuous flow is split into droplets, the nozzle hole has a hole diameter of 0.05 mm to 0.12 mm, the liquid is a liquid having a viscosity of 0.6 mPa・s to 4.0 mPa・s, 5. The liquid ejection apparatus according to claim 4, wherein the liquid is a liquid having a viscosity of 0.65 mPa・s to 3.3 mPa・s, The control section controls the supply pressure of the pressurized liquid supply section so that the speed of the liquid jetted from the nozzle hole is 10 m / s to 70 m / s, and so that the number of droplets per second (pieces / s) as the number of droplets generated by the splitting of the continuous flow into the droplets is Drop freq , 。 a velocity of the liquid ejected from the nozzle hole is in a range of 14 m / s to 52 m / s, 6. The liquid ejection apparatus according to claim 4 or 5, wherein a dropletization distance at which the continuous flow is split into droplets is 5 mm to 150 mm. The number of droplets (pieces / s) is in the range of 0.5 x 10 5 ~ 2.4 x 10 5 ~ 2.4 x 10 ​ ​

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