Liquid injection device

Abstract

To provide a liquid jet device configured to make a head part jet liquid for washing a material adhering to an object, which can enhance washing effect while suppressing jetting quantities.SOLUTION: A liquid jet device 1 comprises a head part 2 that jets liquid 3, and liquid carrying pipes 7 through which the liquid 3 is carried to the head part 2. The liquid 3 includes a solvent and a washing agent that is stronger in washing force for washing a material adhering to an object than the solvent, where the content of the washing agent contained in the liquid 3 is 1 weight% or larger. The liquid jet device makes the head part 2 jet the liquid 3 by continuous flow 3a and forms the continuous flow 3a into droplets to make the continuous flow formed into droplets 3b collide with the object.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a liquid ejecting apparatus. Background Art

[0002] Conventionally, various liquid ejecting apparatuses that eject liquid onto a target object have been used. Among such liquid ejecting apparatuses, there is a liquid ejecting apparatus that ejects, from a head section, a liquid for cleaning deposits adhering to a target object. For example, Patent Document 1 discloses a high-pressure cleaning system provided with a high-pressure pump for increasing the ejection pressure from a discharge unit of a cleaning liquid, which is a liquid for cleaning deposits adhering to a target object. Furthermore, Patent Documents 2 and 3 disclose a liquid injection device capable of continuously spraying liquid from a head and simultaneously atomizing the continuous flow into droplets which then impact an object. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese National Publication of International Patent Application No. 2017-533095 Patent Document 2 Japanese Unexamined Patent Publication No. 2021-147998 Patent Document 3 Japanese Unexamined Patent Publication No. 2021-120545 Summary of the Invention Problem to be Solved by the Invention

[0004] However, in a conventional liquid ejecting apparatus that ejects, from a head section, a liquid for cleaning deposits adhering to a target object as described in Patent Document 1, the ejection amount becomes excessively large, so that the places and applications where the apparatus can be used have been limited. On the other hand, in a conventional liquid ejecting apparatus that ejects a liquid such as water from a head section as a continuous flow, atomizes the continuous flow, and causes the liquid to collide with a target object in the form of droplets, although the ejection amount can be reduced, the cleaning power may not be sufficient when cleaning deposits adhering to the target object. Means for Solving the Problem

[0005] The present invention, which solves the above problems, comprises a head unit for spraying liquid and a liquid transport pipe for transporting the liquid to the head unit, wherein the liquid comprises a solvent and a detergent having a stronger cleaning power than the solvent for cleaning deposits attached to the object, the content of the detergent in the liquid is 1% by weight or more, and the liquid is sprayed from the head unit in a continuous flow and the continuous flow is atomized into droplets which then collide with the object. [Brief explanation of the drawing]

[0006] [Figure 1] A schematic diagram showing the liquid injection device of Example 1. [Figure 2] A graph showing the cleaning effect achieved using the liquid spray device of Example 1. [Figure 3] A graph showing the effect of adding a cleaning agent using the liquid spray device of Example 1. [Figure 4] A graph showing the correlation between the amount of detergent added and the cleaning effect when using the liquid spray device of Example 1. [Figure 5] A schematic diagram showing the liquid injection device of Example 2. [Modes for carrying out the invention]

[0007] First, the present invention will be described in general terms. A first embodiment of the present invention for solving the above problems comprises a head unit for spraying liquid and a liquid transport pipe for transporting the liquid to the head unit, wherein the liquid comprises a solvent and a detergent having a stronger cleaning power than the solvent for cleaning deposits attached to the object, the content of the detergent in the liquid is 1% by weight or more, and the liquid is sprayed from the head unit in a continuous flow and the continuous flow is atomized into droplets which then collide with the object.

[0008] According to this embodiment, a liquid is sprayed from the head in a continuous flow and the continuous flow is atomized into droplets which then collide with the target object. Furthermore, the liquid contains 1% by weight or more of a cleaning agent. As a result, the amount of spray can be suppressed, and the cleaning effect can be enhanced by including 1% by weight or more of a cleaning agent in the liquid.

[0009] A liquid spraying device according to a second aspect of the present invention is characterized in that, in the first aspect, the content of the cleaning agent in the liquid is 10% by weight or less.

[0010] According to this embodiment, the detergent content is 1% by weight or more and 10% by weight or less. Including 1% by weight or more of the detergent enhances the cleaning effect, but including more than 10% by weight of the detergent does not further improve the cleaning effect. On the other hand, by keeping the detergent content at 10% by weight or less, it is possible to suppress the decrease in workability and increase in liquid costs that occur when including more than 10% by weight of the detergent due to increased foaming.

[0011] A liquid injection device according to a third aspect of the present invention is characterized in that, in the first or second aspect, it comprises a liquid storage section for storing the liquid, and the liquid transport pipe transports the liquid from the liquid storage section to the head section.

[0012] According to this embodiment, the device is equipped with a liquid storage section for storing liquid, and a liquid transport pipe transports the liquid from the liquid storage section to the head section. This configuration simplifies the device structure and helps to suppress increases in the manufacturing costs of the device.

[0013] A liquid injection device according to a fourth aspect of the present invention, in the first or second aspect, comprises a solvent storage section for storing the solvent, a detergent storage section for storing the detergent, and a mixing section connected to the solvent storage section and the detergent storage section for mixing the solvent and the detergent, wherein the liquid transport pipe transports the liquid from the mixing section to the head section.

[0014] According to this aspect, the liquid ejecting apparatus includes a solvent storage section, a cleaning agent storage section, and a mixing section, and the liquid conveyance pipe conveys liquid from the mixing section to the head section. Such a configuration facilitates changing of the mixing ratio of the solvent and the cleaning agent, and the like. Further, for example, the cleaning agent can be mixed into the solvent immediately before being ejected from the head section, and residue of the cleaning agent in the apparatus can be reduced.

[0015] A liquid ejecting apparatus according to a fifth aspect of the present invention, in the fourth aspect, includes a control section that controls a mixing ratio of the solvent and the cleaning agent mixed in the mixing section, wherein the control section is capable of controlling an ejection amount of the liquid from the head section, and changes the mixing ratio in accordance with the ejection amount.

[0016] According to this aspect, the ejection amount of the liquid can be controlled, and the mixing ratio of the solvent and the cleaning agent is changed in accordance with the ejection amount. Therefore, a suitable mixing ratio can be automatically achieved in accordance with the ejection amount of the liquid.

[0017] A liquid ejecting apparatus according to a sixth aspect of the present invention, in the fourth aspect, includes a liquid supply section that supplies the solvent from the solvent storage section to the head section, between the solvent storage section and the head section, wherein the mixing section is provided between the liquid supply section and the head section.

[0018] According to this aspect, the mixing section is provided between the liquid supply section and the head section. Therefore, since the cleaning agent does not mix into the liquid supply section, residue of the cleaning agent in the liquid supply section can be reduced, and maintenance of the liquid supply section is facilitated.

[0019] A liquid ejecting apparatus according to a seventh aspect of the present invention, in the first or second aspect, is characterized in that the head section has at least one nozzle, and a hole diameter of the nozzle is not less than 0.01 mm and not more than 0.15 mm.

[0020] According to this aspect, the hole diameter of the nozzle is not less than 0.01 mm and not more than 0.15 mm. By setting such a hole diameter, the liquid can be suitably ejected when the liquid is ejected as a continuous flow from the head section, the continuous flow is formed into droplets, and the droplets are caused to collide with an object.

[0021] In the liquid ejecting apparatus according to the eighth aspect of the present invention, in the first or second aspect described above, an ejection amount of the liquid from the head section is not less than 1 ml / min and not more than 25 ml / min.

[0022] According to this aspect, the ejection amount of the liquid is not less than 1 ml / min and not more than 25 ml / min. By setting such an ejection amount of the liquid, the liquid can be suitably ejected when the liquid is ejected as a continuous flow from the head section, the continuous flow is formed into droplets, and the droplets are caused to collide with an object.

[0023] In the liquid ejecting apparatus according to the ninth aspect of the present invention, in the first or second aspect described above, an ejection pressure of the liquid from the head section is not less than 0.5 MPa and not more than 3.0 MPa.

[0024] According to this aspect, the ejection pressure of the liquid is not less than 0.5 MPa and not more than 3.0 MPa. By setting such an ejection pressure of the liquid, the liquid can be suitably ejected when the liquid is ejected as a continuous flow from the head section, the continuous flow is formed into droplets, and the droplets are caused to collide with an object.

[0025] [Example 1] Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. First, an outline of a liquid ejecting apparatus 1 according to Example 1 of the present invention will be described with reference to FIG. 1. The liquid ejecting apparatus 1 shown in FIG. 1 includes: a head section 2 having a nozzle 27; a liquid storage section 8 that stores a liquid 3 to be ejected; a liquid conveying pipe 7 that connects the head section 2 and the liquid storage section 8; a liquid supply section 6 having a pump or the like; and a control section 5 having a control signal line 52 for the liquid supply section 6.

[0026] The user can use a liquid spraying device 1 with this configuration to spray liquid 3 from a nozzle 27 on a head unit 2 and cause the liquid 3 to collide with the desired object, thereby cleaning off any deposits attached to the object. The liquid spraying device 1 in this embodiment is a liquid spraying device in which a continuous flow 3a of liquid 3 sprayed in a continuous state in direction b from a plurality of nozzles 27 provided on a head unit 2 becomes liquid droplets 3b, and these droplets 3b collide with the target object.

[0027] As described above, the liquid injection device 1 of this embodiment consists of a liquid storage unit 8 for storing the liquid 3 to be injected, a liquid supply unit 6 for delivering the liquid 3, a control unit 5 for controlling the operation of the liquid supply unit 6, and a head unit 2. Furthermore, by using a flexible resin material or the like for the liquid transport pipe 7, which serves as a liquid delivery channel connecting the liquid storage unit 8 to the head unit 2, handling can be improved.

[0028] Furthermore, the diameter of each nozzle 27 on the head unit 2 is in the range of 0.01 mm to 0.15 mm. By narrowing the diameter of the nozzles 27, it is not necessary to supply a huge amount of liquid, and it becomes possible to wash household items such as kitchenware and sanitary products with a small amount of liquid. The liquid supply unit 6 is driven by the control unit 5 and supplies liquid 3 at a predetermined pressure or predetermined flow rate. The pressure or flow rate can be arbitrarily changed by the user by inputting instructions to the control unit 5.

[0029] Here, liquid 3 contains water as a solvent and a detergent at a predetermined concentration. Water can be preferably used as the solvent, and a surfactant can be preferably used as the detergent. The concentration of the detergent is preferably 1% by weight or more, and more preferably 1% by weight or more and 10% by weight or less. Liquid 3 in this embodiment also contains a detergent at a predetermined concentration of 1% by weight or more and 10% by weight or less. Furthermore, it is preferable that the detergent contains one or more of the following, for example, carboxylates, sulfonates, sulfate esters, amine oxides, phosphate esters, alkyl glycosides, alkylglycerols, alkylhydroxysulfobetaine and sodium dialkylsulfosuccinate, which are representative examples of amphoteric surfactants, and polyoxyethylene alkyl ethers, which are representative examples of nonionic surfactants.

[0030] However, there are no particular limitations on the solvent and the cleaning agent; the cleaning agent should be a substance that has a higher cleaning power than the solvent in removing deposits attached to the object. Whether or not the cleaning agent has a higher cleaning power than the solvent in removing deposits attached to the object can be determined by comparing the cleaning effect when liquid 3 containing the cleaning agent in the solvent is sprayed under the same spraying conditions with the cleaning effect when only the solvent is sprayed.

[0031] As described above, the liquid spraying device 1 of this embodiment comprises a head unit 2 for spraying liquid 3 and a liquid transport pipe 7 for transporting liquid 3 to the head unit 2. Liquid 3 contains water, which is an example of a solvent, and a detergent that has a stronger cleaning power than the solvent for cleaning off deposits attached to the target object. Here, the content of the detergent in liquid 3 is 1% by weight or more. Furthermore, the liquid spraying device 1 of this embodiment is a liquid spraying device that sprays liquid 3 from the head unit 2 in a continuous flow 3a and simultaneously atomizes the continuous flow 3a into droplets 3b which then collide with the target object.

[0032] As described above, the liquid spraying device 1 of this embodiment sprays liquid 3 from the head unit 2 in a continuous flow 3a and simultaneously atomizes the continuous flow 3a into droplets 3b which then collide with the target object. Furthermore, the liquid 3 contains 1% by weight or more of a cleaning agent. By employing such a liquid spraying device 1, the amount of liquid 3 sprayed can be suppressed, and by including 1% by weight or more of a cleaning agent in the liquid 3, the cleaning effect can be enhanced.

[0033] Furthermore, as described above, in the liquid spraying device 1 of this embodiment, the detergent content in liquid 3 is 10% by weight or less. That is, the detergent content of liquid 3 in this embodiment is 1% by weight or more and 10% by weight or less. Including 1% by weight or more of detergent enhances the cleaning effect, but including more than 10% by weight of detergent does not further improve the cleaning effect. On the other hand, by keeping the detergent content at 10% by weight or less, it is possible to suppress the decrease in workability due to the tendency to foam, which occurs when including more than 10% by weight of detergent, and the increase in the cost of liquid 3.

[0034] Furthermore, as described above, the liquid injection device 1 of this embodiment includes a liquid storage section 8 for storing liquid 3, and the liquid transport pipe 7 transports the liquid 3 from the liquid storage section 8 to the head section 2. By adopting this configuration, the device configuration of the liquid injection device 1 can be simplified, and an increase in the manufacturing cost of the liquid injection device 1 can be suppressed.

[0035] Furthermore, as described above, the liquid injection device 1 of this embodiment includes a head unit 2 having a plurality of nozzles 27. The head unit 2 has a plurality of nozzles 27, and the hole diameter of each nozzle 27 is 0.024 mm. Here, it is preferable that the hole diameter of the nozzles 27 is 0.01 mm or more and 0.15 mm or less. This is because such a hole diameter allows for suitable injection of the liquid 3 when the liquid 3 is injected from the head unit 2 in a continuous flow 3a and the continuous flow 3a is droplet-shaped to collide with the target object in the form of droplets 3b. Although the head unit 2 of this embodiment has a plurality of nozzles 27, there is no particular limit to the number of nozzles 27, and the number of nozzles 27 may be one.

[0036] The following describes, with reference to Figure 2, the results of verifying the effect of adding a cleaning agent to water by spraying a liquid 3 (water with a cleaning agent added) onto an object using a liquid spraying device 1. For this verification, a liquid spraying device 1 was used, which had a nozzle 27 with a hole diameter of 0.024 mm and a head 2 capable of spraying liquid 3. As the liquid 3 to be sprayed, a mixture of pure water and a commercially available cleaning solution at 10% by weight was used, and the cleaning performance was compared between spraying only pure water and spraying the mixture with 10% by weight of the commercially available cleaning solution.

[0037] Specifically, a 5cm square area on a commercially available wooden cutting board coated with commercially available peanut butter was used as the cleaning target for evaluation. In detail, the spray pressure conditions were varied to 0.5 MPa, 0.7 MPa, 1 MPa, and 3 MPa, and the liquid was sprayed for 60 seconds using liquid sprayer 1. After that, the degree of dirt removal was evaluated from the relative light unit (RLU) measurement value using a Kikkoman Biochemifa Lumitester Smart. The commercially available cleaning solution was applied to the target area according to the product's instructions, left for 60 seconds, and then rinsed with running water.

[0038] The graph in Figure 2 shows the evaluation results of the above assessment, with the horizontal axis representing the cleaning conditions and the vertical axis representing the luminescence (hereinafter referred to as Lumitester luminescence) measured using the Kikkoman Biochemifa Lumitester Smart. Figure 2 shows the relative luminescence for each of the above conditions. In Figure 2, a higher luminescence indicates that the peanut butter has not been removed from the cutting board and that it is dirty. The average Lumitester luminescence, which shows the dirt on the cutting board before applying peanut butter (the leftmost result in Figure 2), is approximately 6000 RLU. In Figure 2, the comparison of the peanut butter removal effect for each test condition is shown, using this value of approximately 6000 RLU as a baseline.

[0039] As shown in the second result from the left in Figure 2, the luminescence output of the luminometer after applying peanut butter is high at approximately 400,000 RLU. If the product is then cleaned using a commercially available cleaning solution according to the product's instructions, the luminescence output of the luminometer decreases to approximately 130,000 RLU, as shown in the third result from the left in Figure 2, but it does not return to the state before application.

[0040] On the other hand, in cleaning with pure water at spray pressures of 0.5 MPa, 1 MPa, 3 MPa, and 5 MPa, dirt can be removed to the state before application when the spray pressure is approximately 3 MPa or higher. Furthermore, in cleaning with a mixed solution containing a cleaning agent at spray pressures of 0.5 MPa, 0.7 MPa, 1 MPa, and 3 MPa, dirt can be removed to the state before application when the spray pressure is 0.7 MPa or higher, and dirt can be removed to a state close to the state before application even at a spray pressure of 0.5 MPa. In addition, even at a spray pressure of 0.5 MPa, the cleaning effect is significantly higher than when cleaning with commercially available cleaning agents according to the product's instructions. From the above, it can be considered that by spraying liquid 3 containing the cleaning agent in droplet form onto the target object, the impact pressure and shear force of the droplet 3b activate the cleaning action of the cleaning agent, promote the emulsification of the target object, and improve cleaning efficiency.

[0041] Furthermore, Figure 3 shows another evaluation result regarding the cleaning effect on the target object when a cleaning agent is added to pure water as the spraying liquid. In Figure 3, the horizontal axis represents the jet irradiation time, which is the time the spraying liquid is sprayed onto the target object in droplet form, and the vertical axis represents the luminescence output of a luminometer. The figure shows the results of comparing the luminescence output corresponding to peanut butter stains on a cutting board for each jet irradiation time, when pure water is used as the spraying liquid and when a mixed solution containing 10% by weight of the cleaning agent is used. As shown in Figure 3, when liquid 3 is sprayed for 30 seconds, the luminescence output of the mixed solution becomes approximately 1 / 10 of the luminescence output of pure water when the spraying pressure is 0.5 MPa or 1.0 MPa, indicating that the cleaning effect is significantly enhanced by adding a cleaning agent to pure water.

[0042] Furthermore, Figure 4 illustrates the optimal concentration of the cleaning agent for achieving particularly high cleaning effectiveness. In Figure 4, the horizontal axis represents the concentration of the cleaning agent, and the vertical axis represents the luminescence of a luminometer. As shown in Figure 4, even when the cleaning agent concentration is reduced to 2.0% by weight, the cleaning performance does not decrease compared to when the concentration is 10.0% by weight. It can also be seen that the cleaning performance remains high even at a concentration of 1.0% by weight. Note that when spraying at a concentration of 2.0% by weight, at a spray pressure of 1 MPa, for 60 seconds, the amount of cleaning agent used is 0.25 ml in terms of undiluted solution, which is approximately 1 / 4 of the normal amount of cleaning agent used according to the product's instructions (0.90 ml).

[0043] Furthermore, it is preferable to adjust the amount of liquid 3 sprayed from the head unit 2 to be between 1 ml / min and 25 ml / min. This is because, as a result of diligent research by the inventors, it was found that by setting the amount of liquid 3 sprayed to this extent, the liquid 3 can be suitably sprayed when the liquid 3 is sprayed from the head unit 2 in a continuous flow 3a and the continuous flow 3a is atomized into droplets 3b which then collide with the target object.

[0044] Furthermore, it is preferable to adjust the injection pressure of the liquid 3 from the head unit 2 to be between 0.5 MPa and 3.0 MPa. This is because, as a result of diligent research by the inventors, it was found that by setting the injection pressure of the liquid 3 to this extent, the liquid 3 can be suitably injected when the liquid 3 is injected from the head unit 2 in a continuous flow 3a and the continuous flow 3a is converted into droplets 3b which then collide with the target object.

[0045] [Example 2] The liquid injection device 1 of Example 2 will be described below with reference to Figure 5. Figure 5 is a diagram corresponding to Figure 1 of the liquid injection device 1 of Example 1. The liquid injection device 1 of this example is the same as the liquid injection device 1 of Example 1, except for the configuration described below. Therefore, the liquid injection device 1 of this example has the same characteristics as the liquid injection device 1 of Example 1, except for the parts described below, such as the configuration of the head part 2 and the amount and pressure of liquid 3. Accordingly, in Figure 5, components common to Example 1 are indicated by the same reference numerals, and detailed explanations are omitted.

[0046] As described above, the liquid spray device 1 of Example 1 was configured to store and use a liquid 3, which is a mixture of water (solvent) and a detergent agent, in a liquid storage unit 8 as the spray liquid. On the other hand, as shown in Figure 5, the liquid spray device 1 of this embodiment includes a solvent storage unit 81 for storing water (solvent 31) and a detergent storage unit 82 for storing detergent 32. Furthermore, the liquid spray device 1 of this embodiment includes a mixing unit 4 connected to the solvent storage unit 81 and the detergent storage unit 82 via a liquid transport pipe 7 between the liquid supply unit 6 and the head unit 2, which mixes the water (solvent 31) and the detergent 32 to produce liquid 3. The liquid transport pipe 7 is configured to transport liquid 3 from the mixing unit 4 to the head unit 2. With this configuration, the liquid spray device 1 of this embodiment makes it easy to change the mixing ratio of solvent 31 and detergent 32. Also, for example, the detergent 32 can be mixed with the solvent 31 just before spraying from the head unit 2, which can reduce detergent residue in the device.

[0047] Furthermore, in the liquid spray device 1 of this embodiment, the control unit 5 is connected to the mixing unit 4 by a control signal line 53. The control unit 5 is configured to control the mixing ratio of the solvent and detergent mixed in the mixing unit 4, control the amount of liquid 3 sprayed from the head unit 2, and change the mixing ratio of the solvent 31 and detergent 32 according to the amount of liquid 3 sprayed. Therefore, the liquid spray device 1 of this embodiment can automatically achieve a suitable mixing ratio according to the amount of liquid 3 sprayed.

[0048] In detail, the control unit 5 can supply and stop the detergent 32 to the mixing unit 4 via the liquid transport pipe 7, and can also change the supply amount. For example, the control unit 5 can control the supply of the detergent 32 to the mixing unit 4 by opening and closing a solenoid valve (not shown) or by driving a linear switch (not shown) based on a signal to the liquid supply unit 6, thereby adjusting the supply amount of detergent 32 according to the amount of solvent 31 delivered so that the detergent concentration is set to a preferred level according to the degree of soiling of the object to be cleaned. In this embodiment, one control unit 5 serves both to control the liquid supply unit 6 and to control the mixing unit 4, but separate control units may be provided for controlling the liquid supply unit 6 and the mixing unit 4.

[0049] While water can be primarily used as the solvent stored in the solvent storage unit 81, a dedicated cleaning solution or a liquid 3 pre-mixed with the cleaning agent 32 may also be used as the liquid stored in the solvent storage unit 81, depending on the type of dirt on the object to be cleaned and the area to be cleaned. In this case, the supply of the cleaning agent 32 from the cleaning agent storage unit 82 can be kept constantly stopped. With this configuration, by changing the liquid stored in the solvent storage unit 81, once the object to be cleaned has been emulsified by the spraying of the liquid 3 containing the cleaning agent 32, the spraying can be switched to water only, which does not contain the cleaning agent 32. This allows the object to be washed away with the water stream, thus preventing residue of the cleaning agent from remaining on the spray surface due to drying and increasing the water-saving effect.

[0050] Furthermore, in this embodiment, the liquid injection device 1 is equipped with a liquid supply unit 6 between the solvent storage unit 81 and the head unit 2 to supply the solvent 31 from the solvent storage unit 81 to the head unit 2, but the mixing unit 4 is provided between the liquid supply unit 6 and the head unit 2. As a result, the cleaning agent 32 does not get mixed into the liquid supply unit 6, so the residue of the cleaning agent 32 in the liquid supply unit 6 can be reduced, and maintenance of the liquid supply unit 6 becomes easier.

[0051] In other words, in this embodiment, the liquid spray device 1 places the detergent storage section 82 between the liquid supply section 6 and the head section 2, preventing the detergent components 32 from adhering to the liquid supply section 6. Furthermore, it eliminates the need to flush the liquid supply section 6 with a large amount of water for internal cleaning, thus avoiding malfunctions and failures of the liquid supply section 6, facilitating maintenance and storage in proper condition, and also achieving water conservation.

[0052] In this embodiment, as with the liquid spraying device 1 of the embodiment, when the liquid 3 mixed with the cleaning agent 32 is sprayed onto the target object, when peanut butter spread on a 5cm square area on a cutting board is used as the target object, the dirt can be removed to its pre-application state at a spraying pressure of 0.7 MPa, and even at a spraying pressure of 0.5 MPa, the cleaning effect was higher than that of commercially available cleaning solutions. These spraying pressures of 0.5 MPa to 0.7 MPa are within the range of tap water pressure, and by connecting the water passage for the solvent 31 to a general water tap, there is no need to prepare a separate liquid supply unit 6, and efficient cleaning using the liquid spraying device 1 can be easily performed. When connecting to a water supply, a flow meter can be placed in the liquid transport pipe 7, which is the passage for the liquid 3, to measure the amount of liquid delivered, and the amount of cleaning agent 32 supplied can be changed based on the measured value.

[0053] The present invention is not limited to the embodiments described above, and can be realized in various configurations without departing from its spirit. The technical features in the embodiments corresponding to the technical features in each embodiment described in the summary of the invention can be replaced or combined as appropriate in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be deleted as appropriate. [Explanation of Symbols]

[0054] 1...Liquid spray device, 2...Head unit, 3...Liquid, 3a...Continuous flow, 3b...Droplet, 4...Mixing unit, 5...Control unit, 6...Liquid supply unit, 7...Liquid transport pipe, 8...Liquid storage unit, 27...Nozzle, 31...Solvent, 32...Detergent, 52...Control signal line, 53...Control signal line, 81...Solvent storage unit, 82...Detergent storage unit

Claims

1. A head unit that sprays a liquid containing a solvent and a cleaning agent for cleaning off deposits attached to an object, and a liquid transport pipe that transports the liquid to the head unit, A solvent storage section for storing the aforementioned solvent, A cleaning agent storage section for storing the aforementioned cleaning agent, A mixing unit connected to the solvent storage unit and the detergent storage unit, which mixes the solvent and the detergent, The system includes a control unit that controls the mixing ratio of the solvent and the detergent mixed in the mixing unit, The content of the detergent in the liquid is 1% by weight or more of the liquid. The liquid transport pipe transports the liquid from the mixing section to the head section. The control unit can control the amount of liquid sprayed from the head unit, and can also change the mixing ratio according to the amount of liquid sprayed. The liquid is sprayed from the head in a continuous flow, and the continuous flow is atomized into droplets which then collide with the target object. The head portion has at least one nozzle, The diameter of the nozzle is 0.01 mm or more and 0.15 mm or less. The amount of liquid sprayed from the head portion is 1 mL / min or more and 25 mL / min or less. A liquid injection device characterized in that the injection pressure of the liquid from the head portion is 0.5 MPa or more and 3.0 MPa or less.

2. In the liquid injection device according to claim 1, A liquid spraying device characterized in that the content of the cleaning agent in the liquid is 10% by weight or less of the liquid.

3. In the liquid injection device according to claim 1 or 2, It comprises a liquid storage section for storing the aforementioned liquid, The liquid transport pipe is characterized by transporting the liquid from the liquid storage section to the head section of the liquid injection device.

4. In the liquid injection device according to claim 1, A liquid supply unit for supplying the solvent from the solvent storage unit to the head unit is provided between the solvent storage unit and the head unit. The liquid injection device is characterized in that the mixing section is provided between the liquid supply section and the head section.

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